CN113389088A - Carbon paper with flame retardant property and preparation method thereof - Google Patents

Carbon paper with flame retardant property and preparation method thereof Download PDF

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Publication number
CN113389088A
CN113389088A CN202110576636.0A CN202110576636A CN113389088A CN 113389088 A CN113389088 A CN 113389088A CN 202110576636 A CN202110576636 A CN 202110576636A CN 113389088 A CN113389088 A CN 113389088A
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paper
mixing
parts
agent
flame retardant
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CN113389088B (en
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刘兴发
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Inner Mongolia Kuaiwei Technology Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
    • B01J13/02—Making microcapsules or microballoons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/10—Duplicating or marking methods; Sheet materials for use therein by using carbon paper or the like
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/34—Ignifugeants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Paper (AREA)
  • Color Printing (AREA)

Abstract

The invention discloses carbon paper with flame retardant property and a preparation method thereof, and relates to the technical field of new materials. The preparation method comprises the steps of preparing microcapsules by taking melamine-formaldehyde resin as a wall material, using phosphated chitosan as a flame retardant, mixing the flame retardant and the microcapsules to prepare an upper paper dyeing coating and a lower paper coloring coating, adding functional diatomite and magnesium-aluminum hydrotalcite into raw paper pulp, stirring, making paper sheets, squeezing and drying to obtain the raw paper, coating the upper paper dyeing coating on the back of the upper paper, and coating the lower paper coloring coating on the front of the lower paper to obtain the carbon paper with flame retardant property. The carbon paper with flame retardant property prepared by the invention has excellent flame retardant property and better writing stability.

Description

Carbon paper with flame retardant property and preparation method thereof
Technical Field
The invention relates to the technical field of new materials, in particular to carbon paper with flame retardant property and a preparation method thereof.
Background
The copy paper commonly used at present is a hidden copy paper, and has the functions of direct copying and direct color development. The color development of the ink is mainly as follows: under the action of external force, the force-sensitive pigment and oil solution in the microcapsule overflow and contact with the color-developing agent to produce dyeing reaction, so as to play the role of duplicating. The method is mainly used for multi-form tables, bills, continuous financial bills, general business financial bills and the like.
It is well known that paper and paper products are generally made from plant fibers. The flammability of vegetable fibres determines the flammability of the paper product, and the use of paper tends to cause fire. With the increasing importance of fire safety, the flame retardant requirements for certain paper and paperboard varieties are increasing day by day. Therefore, it is also increasingly important to prepare flame retardant papers.
Aiming at the defects of the prior art, the carbon paper with flame retardant property and better writing storability is prepared.
Disclosure of Invention
The invention aims to provide carbon paper with flame retardant property and a preparation method thereof, which aim to solve the problems in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
a carbon paper with flame retardant property mainly comprises the following components in parts by weight: 600-800 parts of paper pulp, 60-80 parts of magnesium aluminum hydrotalcite, 60-80 parts of functionalized diatomite, 120-180 parts of upper paper dyeing paint and 120-180 parts of lower paper color developing paint;
the paper dyeing paint is prepared by mixing microcapsules, a spacing agent, a flame retardant, an adhesive, a thickening agent, a water resistance agent and a surfactant;
the lower paper color developing coating is prepared by mixing kaolin, calcium carbonate, an adhesive, a color developing agent, a dispersing agent, sodium carboxymethyl cellulose, a foam inhibitor, a lubricating agent and a preservative.
Preferably, the functionalized diatomite is prepared by mixing magnesium chloride, sodium hydroxide and diatomite.
Preferably, the microcapsule is prepared by mixing melamine, formaldehyde, leuco dye and OP-10 surfactant; the spacing agent is wheat starch; the flame retardant is phosphatized chitosan prepared by mixing chitosan and phosphorus pentoxide; the adhesive is one or a mixture of two of carboxylic styrene-butadiene latex and modified starch; the thickening agent is one or a mixture of more of carboxymethyl cellulose, gelatin and agar; the waterproof agent is one or a mixture of more of polyamide polyurea, zirconium potassium carbonate, zirconium ammonium carbonate, polyamine polyepoxy resin, urea-formaldehyde resin, glyoxal and melamine formaldehyde resin; the surfactant is one or a mixture of sulfonated succinate and acetylene glycol.
Preferably, the adhesive is one or a mixture of two of carboxylic styrene-butadiene latex and modified starch; the color developing agent is phenolic resin; the dispersing agent is one or a mixture of more of sodium polyacrylate, polyacrylamide and polymethacrylic acid; the foam inhibitor is one or a mixture of more of polydimethylsiloxane, polyether modified silicon and phenethyl alcohol oleate; the lubricant is one or a mixture of more of sulfated castor oil, sodium stearate, calcium stearate, zinc stearate and oxidized polyethylene; the preservative is one or a mixture of more of benzoic acid, sodium benzoate, sorbic acid and potassium sorbate.
As optimization, the carbon paper with flame retardant property mainly comprises the following components in parts by weight: 700 parts of paper pulp, 70 parts of magnesium aluminum hydrotalcite, 70 parts of functionalized diatomite, 180 parts of upper paper dyeing paint and 150 parts of lower paper developing paint;
the paper dyeing paint comprises: 80 parts of microcapsules, 60 parts of spacing agents, 20 parts of flame retardants, 15 parts of adhesives, 2 parts of thickening agents, 2 parts of water resistance agents and 1 part of surfactants;
the lower paper color developing paint comprises: 70 parts of kaolin, 50 parts of calcium carbonate, 12 parts of adhesive, 15 parts of color developing agent, 0.2 part of dispersing agent, 1 part of sodium carboxymethylcellulose, 0.1 part of foam inhibitor, 1.5 parts of lubricant and 0.2 part of preservative.
As optimization, the preparation method of the carbon paper with flame retardant property mainly comprises the following preparation steps:
(1) preparing microcapsules by taking melamine-formaldehyde resin as a wall material and taking leuco dye as a capsule core;
(2) mixing phosphorus pentoxide and chitosan to prepare a flame retardant, and mixing the flame retardant with microcapsules;
(3) preparing an upper paper dyeing paint and a lower paper color developing paint;
(4) using magnesium chloride to modify diatomite to obtain functional diatomite, adding the functional diatomite and the magnesium-aluminum hydrotalcite into raw paper pulp, stirring, making paper, squeezing and drying to obtain raw paper;
(5) and coating the upper paper dyeing paint on the back of the upper paper, and coating the lower paper color developing paint on the front of the lower paper to obtain the carbon paper.
As optimization, the preparation method of the carbon paper with flame retardant property mainly comprises the following preparation steps:
(1) mixing melamine with 37% of formaldehyde solution according to the mass ratio of 3: 5, mixing, stirring until the melamine is completely dissolved, adjusting the pH value of the system to 8.0-9.0 by using triethanolamine, and reacting for 75 minutes under the conditions of magnetic stirring at 70 ℃ and 300-500 r/min to prepare a melamine-formaldehyde prepolymer aqueous solution; mixing styrene-maleic anhydride copolymer and deionized water according to the mass ratio of 1: 19, mixing, emulsifying for 2 hours at 50 ℃ and under the condition that the pH value is 8.0-9.0, and then adjusting the pH value to 4.0-5.0 by using 10% by mass of citric acid to obtain a styrene-maleic anhydride sodium salt solution; mixing a leuco dye and a surfactant according to a mass ratio of 2: 1, uniformly mixing to obtain a mixture, and mixing the mixture and a styrene-maleic anhydride sodium salt solution according to a mass ratio of 9: 20, mixing, stirring and emulsifying under 2000r/min to be uniform to obtain core material emulsion; dripping the core material emulsion into a melamine-formaldehyde prepolymer aqueous solution at a speed of 15ml/min, wherein the mass ratio of the core material emulsion to the melamine-formaldehyde prepolymer aqueous solution is 11: 15, adjusting the pH value to 3.0-4.0 by using 10 mass percent of citric acid, heating to 80 ℃ under stirring at 400r/min, preserving heat for reaction for 2 hours, cooling to 40 ℃ after the reaction is finished, adjusting the pH value of the system to 8.5-9.0 by using 52 mass percent of sodium hydroxide solution, and continuously cooling to 30 ℃ to obtain a microcapsule aqueous solution;
(2) mixing chitosan, phosphorus pentoxide and 66% mass fraction methanesulfonic acid solution according to a mass ratio of 1: 5: 10, mixing, reacting in a zero-temperature ice water bath for 3 hours under the protection of nitrogen after chitosan is completely dissolved, then adding ether until no precipitate is generated, and washing precipitates obtained after filtering by using ether, acetone, methanol and ether in sequence to prepare phosphated chitosan; mixing phosphated chitosan and 2% of glacial acetic acid solution by volume percentage according to the mass ratio of 3: 2, mixing to obtain a phosphorized chitosan solution; transferring the microcapsule aqueous solution into a reaction kettle, heating to 180-200 ℃, introducing nitrogen into the reaction kettle at the aeration rate of 40ml/min, adding a Cu/C catalyst accounting for 5% of the mass of the microcapsule aqueous solution, reacting for 30 minutes, and cooling to room temperature to obtain the microcapsule aqueous solution with aldehyde groups on the capsule wall; mixing a phosphated chitosan solution and a microcapsule aqueous solution with aldehyde groups on the capsule wall according to the mass ratio of 1: 4, mixing, stirring at constant temperature of 40 ℃ and at the rotating speed of 300-500 r/min for reaction for 1 hour, standing after the reaction is finished, removing supernatant after complete layering, washing lower-layer substances for 3 times by using petroleum ether and deionized water in sequence, and drying in vacuum at 50 ℃ for 12 hours to obtain microcapsule powder with a flame retardant;
(3) adding an adhesive, a spacing agent and deionized water into a mixing tank in sequence, stirring at the rotating speed of 1800rpm/min for 5 minutes, adding a microcapsule, a thickening agent, a water resistance agent and a surfactant into the mixing tank in sequence, and stirring at the rotating speed of 1800rpm/min for 20-25 minutes to obtain a dyeing mixed slurry, wherein the mass ratio of the adhesive to the spacing agent to the microcapsule to the thickening agent to the water resistance agent to the surfactant to the deionized water is 15: 60: 80: 2: 2: 1: 30, filtering the dyed mixed slurry by using a 200-mesh sieve to form a paper dyeing paint; adding the foam inhibitor, the dispersing agent and deionized water into a dispersion tank in sequence, stirring at the rotating speed of 1200rpm/min for 5-8 minutes, adding calcium carbonate and kaolin into the dispersion tank, and stirring at the rotating speed of 1800rpm/min for 70 minutes to obtain a pigment dispersion liquid, wherein the mass ratio of the foam inhibitor, the dispersing agent, the calcium carbonate, the kaolin and the deionized water is 1: 2: 500: 800: 300, respectively; transferring the pigment dispersion liquid into a coating mixing tank, sequentially adding an adhesive, a color developing agent, sodium carboxymethylcellulose, a lubricant and a preservative into the coating mixing tank, stirring at the rotation speed of 1800rpm/min for 10-15 minutes, and then adjusting the pH value of the slurry to 4.0-5.0 by using 10% by mass of citric acid to obtain the color developing mixed slurry, wherein the mass ratio of the adhesive, the color developing agent, the sodium carboxymethylcellulose, the lubricant, the preservative and the pigment dispersion liquid is 120: 150: 10: 15: 2: 1603, filtering the color development mixed slurry by using a 200-mesh sieve to form lower paper color development coating;
(4) mixing diatomite, magnesium chloride solid and sodium hydroxide according to a mass ratio of 1: 1: 1.5, mixing, adding into a mortar, grinding until yellow solid at the bottom of the mortar completely disappears, placing in the air, aging for 12-14 hours, washing with distilled water, performing suction filtration for 3 times, and drying a filter cake obtained after suction filtration in a drying oven at 110 ℃ for 8-10 hours to obtain functional diatomite; the method comprises the following steps of (1): 1 adding the raw paper pulp into paper pulp, uniformly mixing to obtain raw paper pulp, making the raw paper pulp into paper sheets, pressing and drying at the temperature of 70-100 ℃ to obtain the paper sheets with the gram weight of 100-170 g/m2The base paper of (1);
(5) and coating the upper paper dyeing coating on one surface of the base paper, and coating the lower paper color developing coating on the other surface of the base paper to obtain the carbon paper.
Preferably, the leuco dye in the step (1) is crystal violet lactone; the surfactant is OP-10 surfactant.
As optimization, the adhesive in the step (3) is modified starch; the thickening agent is carboxymethyl cellulose; the spacing agent is wheat starch; the waterproof agent is glyoxal; the surfactant is sulfonated succinate; the foam inhibitor is polyether modified silicon; the dispersant is sodium polyacrylate; the color developing agent is phenolic resin; the lubricant is calcium stearate; the preservative is potassium sorbate.
As optimization, the thickness of the paper dyeing paint in the step (5) is 10-15 μm; the thickness of the lower paper color development coating is 10-15 μm.
Compared with the prior art, the invention has the following beneficial effects:
adding the magnesium-aluminum hydrotalcite and magnesium hydroxide modified functional diatomite into paper pulp, stirring, making paper, squeezing and drying to obtain base paper; polymerizing melamine and formaldehyde to serve as a microcapsule wall material in the dyeing paint, and oxidizing hydroxymethyl on the surface of the microcapsule wall into aldehyde group; preparing phosphated chitosan by using chitosan and phosphorus pentoxide, and condensing and combining the phosphated chitosan and aldehyde amine of the microcapsule on the surface of the microcapsule; the prepared microcapsule is mixed with other fillers to obtain a dyeing coating, the dyeing coating is coated on one surface of base paper, and the color developing coating is coated on the other surface of the base paper, so that the carbonless copy paper with flame retardant property is obtained.
The imino in the phosphorized chitosan and hydroxymethyl in the microcapsule wall material form Schiff base through condensation reaction, when the carbon paper is used, the Schiff base is broken by acid dye, the microcapsule is broken by mechanical pressure, colorless fuel overflows and carries the chitosan on the capsule wall, and writing is formed on the front surface of the lower paper; meanwhile, the chitosan is safe and non-toxic, belongs to a natural preservative, has strong inhibition on bacteria, and enables the carbon paper not to be easily corroded by microorganisms in the preservation process, thereby enhancing the corrosion resistance of the carbon paper; the kieselguhr can adsorb dye, and the adsorption is stronger after the kieselguhr is modified by magnesium hydroxide, so that the stability of the carbon paper writing is enhanced.
When the carbon paper is heated, a large amount of phosphorus-containing compact carbon layers are generated in the process of heating degradation of the phosphorized chitosan, and the phosphorus-containing compact carbon layers cover the surface of paper fibers; the carbon layer can be used as a heat-insulating and oxygen-insulating layer to protect paper fibers, and can also block the migration of combustible substances to a surface combustion phase and inhibit the heat and mass exchange between a gas phase and a condensed phase, so that the pyrolysis and the combustion of the carbon paper are delayed, and the flame retardant property of the carbon paper is improved; the phosphorized chitosan and melamine formaldehyde resin which is decomposed by heating and releases nitrogen form an expansion type flame retardant system, a carbonaceous foam layer is generated during combustion, the functions of heat insulation, oxygen insulation and smoke suppression are achieved, and the diatomite can promote the formation of a carbon layer with higher strength and a more compact structure; the hydrotalcite is heated and dehydrated, the interlayer hydrogen bonds disappear, the laminate collapses, and the collapsed hydrotalcite lamellar structure is dissociated in the carbonaceous foam layer generated by the expansion type flame-retardant system, so that the strength of the carbonaceous layer is enhanced, and the flame retardant property of the carbon paper is further enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the method of the present invention, the following examples are given, and the test method for each index of the carbon paper having flame retardant property produced in the following examples is as follows:
flame retardant property: the carbon paper prepared in each example and comparative example was cut into 21cm × 7cm samples according to the standard GB/T14656-93, and the flame-holding time, the burning time, and the char length thereof were measured with a flame-retardant paper and paperboard burning tester; the shorter the afterflame time is, the shorter the afterburning time is, the shorter the carbonization length is, and the better the flame retardant property of the carbon paper is.
Writing stability: according to the standard GB/T30789.5, the carbon paper prepared in each example and each comparative example is carbon paper.
Example 1
A carbon paper with flame retardant property mainly comprises the following components in parts by weight: 700 parts of paper pulp, 70 parts of magnesium aluminum hydrotalcite, 70 parts of functionalized diatomite, 180 parts of upper paper dyeing paint and 150 parts of lower paper developing paint;
the paper dyeing paint comprises: 80 parts of microcapsules, 60 parts of spacing agents, 20 parts of flame retardants, 15 parts of adhesives, 2 parts of thickening agents, 2 parts of water resistance agents and 1 part of surfactants;
the lower paper color developing paint comprises: 70 parts of kaolin, 50 parts of calcium carbonate, 12 parts of adhesive, 15 parts of color developing agent, 0.2 part of dispersing agent, 1 part of sodium carboxymethylcellulose, 0.1 part of foam inhibitor, 1.5 parts of lubricant and 0.2 part of preservative.
The preparation method of the carbon paper with the flame retardant property mainly comprises the following preparation steps:
(1) mixing melamine with 37% of formaldehyde solution according to the mass ratio of 3: 5, mixing, stirring until the melamine is completely dissolved, adjusting the pH value of the system to 8.0 by using triethanolamine, and reacting for 75 minutes under the conditions of 70 ℃ and 500r/min magnetic stirring to obtain a melamine-formaldehyde prepolymer aqueous solution; mixing styrene-maleic anhydride copolymer and deionized water according to the mass ratio of 1: 19, mixing, emulsifying for 2 hours at 50 ℃ and under the condition that the pH value is 8.0, and then adjusting the pH value to 4.0 by using 10 mass percent of citric acid to obtain a styrene-maleic anhydride sodium salt solution; mixing a leuco dye and a surfactant according to a mass ratio of 2: 1, uniformly mixing to obtain a mixture, and mixing the mixture and a styrene-maleic anhydride sodium salt solution according to a mass ratio of 9: 20, mixing, stirring and emulsifying under 2000r/min to be uniform to obtain core material emulsion; dripping the core material emulsion into a melamine-formaldehyde prepolymer aqueous solution at a speed of 15ml/min, wherein the mass ratio of the core material emulsion to the melamine-formaldehyde prepolymer aqueous solution is 11: 15, adjusting the pH value to 4.0 by using 10 mass percent of citric acid, heating to 80 ℃ under stirring at 400r/min, preserving heat for reaction for 2 hours, cooling to 40 ℃ after the reaction is finished, adjusting the pH value of a system to 8.5 by using 52 mass percent of sodium hydroxide solution, and continuously cooling to 30 ℃ to obtain a microcapsule aqueous solution;
(2) mixing chitosan, phosphorus pentoxide and 66% mass fraction methanesulfonic acid solution according to a mass ratio of 1: 5: 10, mixing, reacting in a zero-temperature ice water bath for 3 hours under the protection of nitrogen after chitosan is completely dissolved, then adding ether until no precipitate is generated, and washing precipitates obtained after filtering by using ether, acetone, methanol and ether in sequence to prepare phosphated chitosan; mixing phosphated chitosan and 2% of glacial acetic acid solution by volume percentage according to the mass ratio of 3: 2, mixing to obtain a phosphorized chitosan solution; transferring the microcapsule aqueous solution into a reaction kettle, heating to 200 ℃, introducing nitrogen into the reaction kettle at the aeration rate of 40ml/min, adding a Cu/C catalyst accounting for 5% of the mass of the microcapsule aqueous solution, reacting for 30 minutes, and cooling to room temperature to obtain the microcapsule aqueous solution with aldehyde groups on the capsule walls; mixing a phosphated chitosan solution and a microcapsule aqueous solution with aldehyde groups on the capsule wall according to the mass ratio of 1: 4, mixing, stirring at constant temperature of 40 ℃ and at the rotating speed of 500r/min for reaction for 1 hour, standing after the reaction is finished, removing supernatant after complete layering, washing lower-layer substances for 3 times by using petroleum ether and deionized water in sequence, and drying in vacuum at 50 ℃ for 12 hours to prepare microcapsule powder with the flame retardant;
(3) sequentially adding an adhesive, a spacing agent and deionized water into a mixing tank, stirring at the rotating speed of 1800rpm/min for 5 minutes, sequentially adding a microcapsule, a thickening agent, a water resistance agent and a surfactant into the mixing tank, and stirring at the rotating speed of 1800rpm/min for 25 minutes to obtain a dyeing mixed slurry, wherein the mass ratio of the adhesive to the spacing agent to the microcapsule to the thickening agent to the water resistance agent to the surfactant to the deionized water is 15: 60: 80: 2: 2: 1: 30, filtering the dyed mixed slurry by using a 200-mesh sieve to form a paper dyeing paint; adding the foam inhibitor, the dispersing agent and deionized water into a dispersion tank in sequence, stirring for 8 minutes at the rotating speed of 1200rpm/min, then adding calcium carbonate and kaolin into the dispersion tank, and stirring for 70 minutes at the rotating speed of 1800rpm/min to obtain a pigment dispersion liquid, wherein the mass ratio of the foam inhibitor, the dispersing agent, the calcium carbonate, the kaolin and the deionized water is 1: 2: 500: 800: 300, respectively; transferring the pigment dispersion liquid into a coating mixing tank, sequentially adding an adhesive, a color developing agent, sodium carboxymethyl cellulose, a lubricant and a preservative into the coating mixing tank, stirring at the rotating speed of 1800rpm/min for 15 minutes, and then adjusting the pH value of the slurry to 4.5 by using 10% by mass of citric acid to obtain a color developing mixed slurry, wherein the mass ratio of the adhesive, the color developing agent, the sodium carboxymethyl cellulose, the lubricant, the preservative and the pigment dispersion liquid is 120: 150: 10: 15: 2: 1603, filtering the color development mixed slurry by using a 200-mesh sieve to form lower paper color development coating;
(4) solidifying diatomite and magnesium chlorideThe mass ratio of the sodium hydroxide to the solid is 1: 1: 1.5, mixing and adding into a mortar, grinding until yellow solid at the bottom of the mortar completely disappears, placing in the air for aging for 12 hours, washing with distilled water for suction filtration for 3 times, and drying a filter cake obtained after suction filtration in a drying oven at 110 ℃ for 9 hours to obtain functionalized diatomite; the method comprises the following steps of (1): 1 adding the raw paper pulp into the paper pulp, uniformly mixing to obtain raw paper pulp, making the raw paper pulp into paper sheets, pressing and drying at the temperature of 80 ℃ to obtain the paper with the gram weight of 120g/m2The base paper of (1);
(5) and coating the upper paper dyeing coating on one surface of the base paper, and coating the lower paper color developing coating on the other surface of the base paper to obtain the carbon paper.
Preferably, the leuco dye in the step (1) is crystal violet lactone; the surfactant is OP-10 surfactant.
As optimization, the adhesive in the step (3) is modified starch; the thickening agent is carboxymethyl cellulose; the spacing agent is wheat starch; the waterproof agent is glyoxal; the surfactant is sulfonated succinate; the foam inhibitor is polyether modified silicon; the dispersant is sodium polyacrylate; the color developing agent is phenolic resin; the lubricant is calcium stearate; the preservative is potassium sorbate.
As optimization, the thickness of the paper dyeing paint in the step (5) is 15 μm; the thickness of the lower paper color developing paint is 15 μm.
Example 2
A carbon paper with flame retardant property mainly comprises the following components in parts by weight: 700 parts of paper pulp, 70 parts of magnesium aluminum hydrotalcite, 180 parts of upper paper dyeing paint and 150 parts of lower paper color developing paint;
the paper dyeing paint comprises: 80 parts of microcapsules, 60 parts of spacing agents, 20 parts of flame retardants, 15 parts of adhesives, 2 parts of thickening agents, 2 parts of water resistance agents and 1 part of surfactants;
the lower paper color developing paint comprises: 70 parts of kaolin, 50 parts of calcium carbonate, 12 parts of adhesive, 15 parts of color developing agent, 0.2 part of dispersing agent, 1 part of sodium carboxymethylcellulose, 0.1 part of foam inhibitor, 1.5 parts of lubricant and 0.2 part of preservative.
The preparation method of the carbon paper with the flame retardant property mainly comprises the following preparation steps:
(1) mixing melamine with 37% of formaldehyde solution according to the mass ratio of 3: 5, mixing, stirring until the melamine is completely dissolved, adjusting the pH value of the system to 8.0 by using triethanolamine, and reacting for 75 minutes under the conditions of 70 ℃ and 500r/min magnetic stirring to obtain a melamine-formaldehyde prepolymer aqueous solution; mixing styrene-maleic anhydride copolymer and deionized water according to the mass ratio of 1: 19, mixing, emulsifying for 2 hours at 50 ℃ and under the condition that the pH value is 8.0, and then adjusting the pH value to 4.0 by using 10 mass percent of citric acid to obtain a styrene-maleic anhydride sodium salt solution; mixing a leuco dye and a surfactant according to a mass ratio of 2: 1, uniformly mixing to obtain a mixture, and mixing the mixture and a styrene-maleic anhydride sodium salt solution according to a mass ratio of 9: 20, mixing, stirring and emulsifying under 2000r/min to be uniform to obtain core material emulsion; dripping the core material emulsion into a melamine-formaldehyde prepolymer aqueous solution at a speed of 15ml/min, wherein the mass ratio of the core material emulsion to the melamine-formaldehyde prepolymer aqueous solution is 11: 15, adjusting the pH value to 4.0 by using 10 mass percent of citric acid, heating to 80 ℃ under stirring at 400r/min, preserving heat for reaction for 2 hours, cooling to 40 ℃ after the reaction is finished, adjusting the pH value of a system to 8.5 by using 52 mass percent of sodium hydroxide solution, and continuously cooling to 30 ℃ to obtain a microcapsule aqueous solution;
(2) mixing chitosan, phosphorus pentoxide and 66% mass fraction methanesulfonic acid solution according to a mass ratio of 1: 5: 10, mixing, reacting in a zero-temperature ice water bath for 3 hours under the protection of nitrogen after chitosan is completely dissolved, then adding ether until no precipitate is generated, and washing precipitates obtained after filtering by using ether, acetone, methanol and ether in sequence to prepare phosphated chitosan; mixing phosphated chitosan and 2% of glacial acetic acid solution by volume percentage according to the mass ratio of 3: 2, mixing to obtain a phosphorized chitosan solution; transferring the microcapsule aqueous solution into a reaction kettle, heating to 200 ℃, introducing nitrogen into the reaction kettle at the aeration rate of 40ml/min, adding a Cu/C catalyst accounting for 5% of the mass of the microcapsule aqueous solution, reacting for 30 minutes, and cooling to room temperature to obtain the microcapsule aqueous solution with aldehyde groups on the capsule walls; mixing a phosphated chitosan solution and a microcapsule aqueous solution with aldehyde groups on the capsule wall according to the mass ratio of 1: 4, mixing, stirring at constant temperature of 40 ℃ and at the rotating speed of 500r/min for reaction for 1 hour, standing after the reaction is finished, removing supernatant after complete layering, washing lower-layer substances for 3 times by using petroleum ether and deionized water in sequence, and drying in vacuum at 50 ℃ for 12 hours to prepare microcapsule powder with the flame retardant;
(3) sequentially adding an adhesive, a spacing agent and deionized water into a mixing tank, stirring at the rotating speed of 1800rpm/min for 5 minutes, sequentially adding a microcapsule, a thickening agent, a water resistance agent and a surfactant into the mixing tank, and stirring at the rotating speed of 1800rpm/min for 25 minutes to obtain a dyeing mixed slurry, wherein the mass ratio of the adhesive to the spacing agent to the microcapsule to the thickening agent to the water resistance agent to the surfactant to the deionized water is 15: 60: 80: 2: 2: 1: 30, filtering the dyed mixed slurry by using a 200-mesh sieve to form a paper dyeing paint; adding the foam inhibitor, the dispersing agent and deionized water into a dispersion tank in sequence, stirring for 8 minutes at the rotating speed of 1200rpm/min, then adding calcium carbonate and kaolin into the dispersion tank, and stirring for 70 minutes at the rotating speed of 1800rpm/min to obtain a pigment dispersion liquid, wherein the mass ratio of the foam inhibitor, the dispersing agent, the calcium carbonate, the kaolin and the deionized water is 1: 2: 500: 800: 300, respectively; transferring the pigment dispersion liquid into a coating mixing tank, sequentially adding an adhesive, a color developing agent, sodium carboxymethyl cellulose, a lubricant and a preservative into the coating mixing tank, stirring at the rotating speed of 1800rpm/min for 15 minutes, and then adjusting the pH value of the slurry to 4.5 by using 10% by mass of citric acid to obtain a color developing mixed slurry, wherein the mass ratio of the adhesive, the color developing agent, the sodium carboxymethyl cellulose, the lubricant, the preservative and the pigment dispersion liquid is 120: 150: 10: 15: 2: 1603, filtering the color development mixed slurry by using a 200-mesh sieve to form lower paper color development coating;
(4) adding magnesium aluminum hydrotalcite into paper pulp, mixing to obtain raw paper pulp, making raw paper pulp into paper sheet, pressing at 80 deg.C, and oven drying to obtain paper with a gram weight of 120g/m2The base paper of (1);
(5) and coating the upper paper dyeing coating on one surface of the base paper, and coating the lower paper color developing coating on the other surface of the base paper to obtain the carbon paper.
Preferably, the leuco dye in the step (1) is crystal violet lactone; the surfactant is OP-10 surfactant.
As optimization, the adhesive in the step (3) is modified starch; the thickening agent is carboxymethyl cellulose; the spacing agent is wheat starch; the waterproof agent is glyoxal; the surfactant is sulfonated succinate; the foam inhibitor is polyether modified silicon; the dispersant is sodium polyacrylate; the color developing agent is phenolic resin; the lubricant is calcium stearate; the preservative is potassium sorbate.
As optimization, the thickness of the paper dyeing paint in the step (5) is 15 μm; the thickness of the lower paper color developing paint is 15 μm.
Example 3
A carbon paper with flame retardant property mainly comprises the following components in parts by weight: 700 parts of paper pulp, 70 parts of magnesium aluminum hydrotalcite, 70 parts of functionalized diatomite, 180 parts of upper paper dyeing paint and 150 parts of lower paper developing paint;
the paper dyeing paint comprises: 80 parts of microcapsules, 60 parts of spacing agents, 20 parts of flame retardants, 15 parts of adhesives, 2 parts of thickening agents, 2 parts of water resistance agents and 1 part of surfactants;
the lower paper color developing paint comprises: 70 parts of kaolin, 50 parts of calcium carbonate, 12 parts of adhesive, 15 parts of color developing agent, 0.2 part of dispersing agent, 1 part of sodium carboxymethylcellulose, 0.1 part of foam inhibitor, 1.5 parts of lubricant and 0.2 part of preservative.
The preparation method of the carbon paper with the flame retardant property mainly comprises the following preparation steps:
(1) mixing melamine with 37% of formaldehyde solution according to the mass ratio of 3: 5, mixing, stirring until the melamine is completely dissolved, adjusting the pH value of the system to 8.0 by using triethanolamine, and reacting for 75 minutes under the conditions of 70 ℃ and 500r/min magnetic stirring to obtain a melamine-formaldehyde prepolymer aqueous solution; mixing styrene-maleic anhydride copolymer and deionized water according to the mass ratio of 1: 19, mixing, emulsifying for 2 hours at 50 ℃ and under the condition that the pH value is 8.0, and then adjusting the pH value to 4.0 by using 10 mass percent of citric acid to obtain a styrene-maleic anhydride sodium salt solution; mixing a leuco dye and a surfactant according to a mass ratio of 2: 1, uniformly mixing to obtain a mixture, and mixing the mixture and a styrene-maleic anhydride sodium salt solution according to a mass ratio of 9: 20, mixing, stirring and emulsifying under 2000r/min to be uniform to obtain core material emulsion; dripping the core material emulsion into a melamine-formaldehyde prepolymer aqueous solution at a speed of 15ml/min, wherein the mass ratio of the core material emulsion to the melamine-formaldehyde prepolymer aqueous solution is 11: 15, adjusting the pH value to 4.0 by using 10 mass percent of citric acid, heating to 80 ℃ under stirring at 400r/min, preserving heat for reaction for 2 hours, cooling to 40 ℃ after the reaction is finished, adjusting the pH value of a system to 8.5 by using 52 mass percent of sodium hydroxide solution, and continuously cooling to 30 ℃ to obtain a microcapsule aqueous solution;
(2) phosphorus pentoxide and a microcapsule water solution are mixed according to the mass ratio of 1: 4, mixing, stirring at constant temperature of 40 ℃ and at the rotating speed of 500r/min for reaction for 1 hour, standing after the reaction is finished, removing supernatant after complete layering, washing lower-layer substances for 3 times by using petroleum ether and deionized water in sequence, and drying in vacuum at 50 ℃ for 12 hours to prepare microcapsule powder with the flame retardant;
(3) sequentially adding an adhesive, a spacing agent and deionized water into a mixing tank, stirring at the rotating speed of 1800rpm/min for 5 minutes, sequentially adding a microcapsule, a thickening agent, a water resistance agent and a surfactant into the mixing tank, and stirring at the rotating speed of 1800rpm/min for 25 minutes to obtain a dyeing mixed slurry, wherein the mass ratio of the adhesive to the spacing agent to the microcapsule to the thickening agent to the water resistance agent to the surfactant to the deionized water is 15: 60: 80: 2: 2: 1: 30, filtering the dyed mixed slurry by using a 200-mesh sieve to form a paper dyeing paint; adding the foam inhibitor, the dispersing agent and deionized water into a dispersion tank in sequence, stirring for 8 minutes at the rotating speed of 1200rpm/min, then adding calcium carbonate and kaolin into the dispersion tank, and stirring for 70 minutes at the rotating speed of 1800rpm/min to obtain a pigment dispersion liquid, wherein the mass ratio of the foam inhibitor, the dispersing agent, the calcium carbonate, the kaolin and the deionized water is 1: 2: 500: 800: 300, respectively; transferring the pigment dispersion liquid into a coating mixing tank, sequentially adding an adhesive, a color developing agent, sodium carboxymethyl cellulose, a lubricant and a preservative into the coating mixing tank, stirring at the rotating speed of 1800rpm/min for 15 minutes, and then adjusting the pH value of the slurry to 4.5 by using 10% by mass of citric acid to obtain a color developing mixed slurry, wherein the mass ratio of the adhesive, the color developing agent, the sodium carboxymethyl cellulose, the lubricant, the preservative and the pigment dispersion liquid is 120: 150: 10: 15: 2: 1603, filtering the color development mixed slurry by using a 200-mesh sieve to form lower paper color development coating;
(4) mixing diatomite, magnesium chloride solid and sodium hydroxide according to a mass ratio of 1: 1: 1.5, mixing and adding into a mortar, grinding until yellow solid at the bottom of the mortar completely disappears, placing in the air for aging for 12 hours, washing with distilled water for suction filtration for 3 times, and drying a filter cake obtained after suction filtration in a drying oven at 110 ℃ for 9 hours to obtain functionalized diatomite; the method comprises the following steps of (1): 1 adding the raw paper pulp into the paper pulp, uniformly mixing to obtain raw paper pulp, making the raw paper pulp into paper sheets, pressing and drying at the temperature of 80 ℃ to obtain the paper with the gram weight of 120g/m2The base paper of (1);
(5) and coating the upper paper dyeing coating on one surface of the base paper, and coating the lower paper color developing coating on the other surface of the base paper to obtain the carbon paper.
Preferably, the leuco dye in the step (1) is crystal violet lactone; the surfactant is OP-10 surfactant.
As optimization, the adhesive in the step (3) is modified starch; the thickening agent is carboxymethyl cellulose; the spacing agent is wheat starch; the waterproof agent is glyoxal; the surfactant is sulfonated succinate; the foam inhibitor is polyether modified silicon; the dispersant is sodium polyacrylate; the color developing agent is phenolic resin; the lubricant is calcium stearate; the preservative is potassium sorbate.
As optimization, the thickness of the paper dyeing paint in the step (5) is 15 μm; the thickness of the lower paper color developing paint is 15 μm.
Comparative example
A carbon paper with flame retardant property mainly comprises the following components in parts by weight: 700 parts of paper pulp, 70 parts of magnesium aluminum hydrotalcite, 180 parts of upper paper dyeing paint and 150 parts of lower paper color developing paint;
the paper dyeing paint comprises: 80 parts of microcapsules, 60 parts of spacing agents, 20 parts of flame retardants, 15 parts of adhesives, 2 parts of thickening agents, 2 parts of water resistance agents and 1 part of surfactants;
the lower paper color developing paint comprises: 70 parts of kaolin, 50 parts of calcium carbonate, 12 parts of adhesive, 15 parts of color developing agent, 0.2 part of dispersing agent, 1 part of sodium carboxymethylcellulose, 0.1 part of foam inhibitor, 1.5 parts of lubricant and 0.2 part of preservative.
The preparation method of the carbon paper with the flame retardant property mainly comprises the following preparation steps:
(1) mixing melamine with 37% of formaldehyde solution according to the mass ratio of 3: 5, mixing, stirring until the melamine is completely dissolved, adjusting the pH value of the system to 8.0 by using triethanolamine, and reacting for 75 minutes under the conditions of 70 ℃ and 500r/min magnetic stirring to obtain a melamine-formaldehyde prepolymer aqueous solution; mixing styrene-maleic anhydride copolymer and deionized water according to the mass ratio of 1: 19, mixing, emulsifying for 2 hours at 50 ℃ and under the condition that the pH value is 8.0, and then adjusting the pH value to 4.0 by using 10 mass percent of citric acid to obtain a styrene-maleic anhydride sodium salt solution; mixing a leuco dye and a surfactant according to a mass ratio of 2: 1, uniformly mixing to obtain a mixture, and mixing the mixture and a styrene-maleic anhydride sodium salt solution according to a mass ratio of 9: 20, mixing, stirring and emulsifying under 2000r/min to be uniform to obtain core material emulsion; dripping the core material emulsion into a melamine-formaldehyde prepolymer aqueous solution at a speed of 15ml/min, wherein the mass ratio of the core material emulsion to the melamine-formaldehyde prepolymer aqueous solution is 11: 15, adjusting the pH value to 4.0 by using 10 mass percent of citric acid, heating to 80 ℃ under stirring at 400r/min, preserving heat for reaction for 2 hours, cooling to 40 ℃ after the reaction is finished, adjusting the pH value of a system to 8.5 by using 52 mass percent of sodium hydroxide solution, and continuously cooling to 30 ℃ to obtain a microcapsule aqueous solution;
(2) phosphorus pentoxide and a microcapsule water solution are mixed according to the mass ratio of 1: 4, mixing, stirring at constant temperature of 40 ℃ and at the rotating speed of 500r/min for reaction for 1 hour, standing after the reaction is finished, removing supernatant after complete layering, washing lower-layer substances for 3 times by using petroleum ether and deionized water in sequence, and drying in vacuum at 50 ℃ for 12 hours to prepare microcapsule powder with the flame retardant;
(3) sequentially adding an adhesive, a spacing agent and deionized water into a mixing tank, stirring at the rotating speed of 1800rpm/min for 5 minutes, sequentially adding a microcapsule, a thickening agent, a water resistance agent and a surfactant into the mixing tank, and stirring at the rotating speed of 1800rpm/min for 25 minutes to obtain a dyeing mixed slurry, wherein the mass ratio of the adhesive to the spacing agent to the microcapsule to the thickening agent to the water resistance agent to the surfactant to the deionized water is 15: 60: 80: 2: 2: 1: 30, filtering the dyed mixed slurry by using a 200-mesh sieve to form a paper dyeing paint; adding the foam inhibitor, the dispersing agent and deionized water into a dispersion tank in sequence, stirring for 8 minutes at the rotating speed of 1200rpm/min, then adding calcium carbonate and kaolin into the dispersion tank, and stirring for 70 minutes at the rotating speed of 1800rpm/min to obtain a pigment dispersion liquid, wherein the mass ratio of the foam inhibitor, the dispersing agent, the calcium carbonate, the kaolin and the deionized water is 1: 2: 500: 800: 300, respectively; transferring the pigment dispersion liquid into a coating mixing tank, sequentially adding an adhesive, a color developing agent, sodium carboxymethyl cellulose, a lubricant and a preservative into the coating mixing tank, stirring at the rotating speed of 1800rpm/min for 15 minutes, and then adjusting the pH value of the slurry to 4.5 by using 10% by mass of citric acid to obtain a color developing mixed slurry, wherein the mass ratio of the adhesive, the color developing agent, the sodium carboxymethyl cellulose, the lubricant, the preservative and the pigment dispersion liquid is 120: 150: 10: 15: 2: 1603, filtering the color development mixed slurry by using a 200-mesh sieve to form lower paper color development coating;
(4) adding magnesium aluminum hydrotalcite into paper pulp, mixing to obtain raw paper pulp, making raw paper pulp into paper sheet, pressing at 80 deg.C, and oven drying to obtain paper with a gram weight of 120g/m2The base paper of (1);
(5) and coating the upper paper dyeing coating on one surface of the base paper, and coating the lower paper color developing coating on the other surface of the base paper to obtain the carbon paper.
Preferably, the leuco dye in the step (1) is crystal violet lactone; the surfactant is OP-10 surfactant.
As optimization, the adhesive in the step (3) is modified starch; the thickening agent is carboxymethyl cellulose; the spacing agent is wheat starch; the waterproof agent is glyoxal; the surfactant is sulfonated succinate; the foam inhibitor is polyether modified silicon; the dispersant is sodium polyacrylate; the color developing agent is phenolic resin; the lubricant is calcium stearate; the preservative is potassium sorbate.
As optimization, the thickness of the paper dyeing paint in the step (5) is 15 μm; the thickness of the lower paper color developing paint is 15 μm.
Examples of effects
The following table 1 shows the results of performance analysis of the carbon paper having flame retardant properties using examples 1 to 3 of the present invention and comparative examples.
TABLE 1
Example 1 Example 2 Example 3 Comparative example
Duration of afterflame(s) 0.7 1.5 2.7 3.9
Continuous ignition time(s) 0.9 1.8 3.3 4.5
Charring length (mm) 13.7 43.0 76.0 95.0
Color difference value 0.15 0.7 22.85 23.75
Compared with the experimental data of the comparative example and the example 1, the carbon paper releases nitrogen when being heated, the melamine formaldehyde resin and the phosphorized chitosan generate a large amount of phosphorus-containing compact carbon layers in the process of temperature rise degradation, the carbon layers cover the surface of the paper fiber, and the carbon layers insulate heat and oxygen and form an expansion type flame retardant system with the melamine formaldehyde resin, so that the pyrolysis and the combustion of the carbon paper are delayed, and the flame retardant property of the carbon paper is improved; the hydrotalcite is heated and dehydrated, the interlayer hydrogen bonds disappear, the laminate collapses, the collapsed hydrotalcite lamellar structure is dissociated in the carbonaceous foam layer generated by the expansion type flame-retardant system, the strength of the carbon layer is enhanced, and the diatomite can promote the formation of the carbon layer with higher strength and more compact structure, so that the flame retardant property of the carbon paper is further enhanced; when the carbon paper is used, the Schiff base between the chitosan and the microcapsule is broken by the acid dye, and a film formed by the chitosan is fixed on the paper in an absorption and adhesion mode, so that the binding fastness of the handwriting is improved, and the stability of the handwriting of the carbon paper is further improved; from the comparison of the experimental data of the embodiment 1 and the embodiment 2, the diatomite can promote the formation of a carbon layer with higher strength and a more compact structure, the flame retardant property of the carbon paper is further enhanced, and the magnesium hydroxide promotes the adsorption capacity of the diatomite to the dye, so that the stability of the handwriting of the carbon paper is enhanced; from the comparison of the experimental data of the embodiment 1 and the embodiment 3, the chitosan is dehydrated and carbonized under the acidic condition to form a carbon layer to cover the surface of the paper fiber, so that the flame retardant property of the carbon paper is enhanced, and in addition, the film formed by the chitosan is fixed on the paper in an absorption and adhesion mode, so that the combination fastness of the writing is improved, and the stability of the writing of the carbon paper is further improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. A carbon paper with flame retardant property mainly comprises the following components in parts by weight: 600-800 parts of paper pulp, 60-80 parts of magnesium aluminum hydrotalcite, 60-80 parts of functionalized diatomite, 120-180 parts of upper paper dyeing paint and 120-180 parts of lower paper color developing paint;
the paper dyeing paint is prepared by mixing microcapsules, a spacing agent, a flame retardant, an adhesive, a thickening agent, a water resistance agent and a surfactant;
the lower paper color developing coating is prepared by mixing kaolin, calcium carbonate, an adhesive, a color developing agent, a dispersing agent, sodium carboxymethyl cellulose, a foam inhibitor, a lubricating agent and a preservative.
2. The carbon paper with flame retardant property of claim 1, wherein the functionalized diatomite is prepared by mixing magnesium chloride, sodium hydroxide and diatomite.
3. The carbon paper with flame retardant property as claimed in claim 2, wherein said microcapsule is prepared by mixing melamine, formaldehyde, leuco dye and OP-10 surfactant; the spacing agent is wheat starch; the flame retardant is phosphatized chitosan prepared by mixing phosphorus pentoxide and chitosan; the adhesive is one or a mixture of two of carboxylic styrene-butadiene latex and modified starch; the thickening agent is one or a mixture of more of carboxymethyl cellulose, gelatin and agar; the waterproof agent is one or a mixture of more of polyamide polyurea, zirconium potassium carbonate, zirconium ammonium carbonate, polyamine polyepoxy resin, urea-formaldehyde resin, glyoxal and melamine formaldehyde resin; the surfactant is one or a mixture of sulfonated succinate and acetylene glycol.
4. The carbon paper with flame retardant property as claimed in claim 3, wherein the adhesive is one or a mixture of two of carboxylic styrene-butadiene latex and modified starch; the color developing agent is phenolic resin; the dispersing agent is one or a mixture of more of sodium polyacrylate, polyacrylamide and polymethacrylic acid; the foam inhibitor is one or a mixture of more of polydimethylsiloxane, polyether modified silicon and phenethyl alcohol oleate; the lubricant is one or a mixture of more of sulfated castor oil, sodium stearate, calcium stearate, zinc stearate and oxidized polyethylene; the preservative is one or a mixture of more of benzoic acid, sodium benzoate, sorbic acid and potassium sorbate.
5. The carbon paper with flame retardant property as claimed in claim 4, characterized by mainly comprising, in parts by weight: 700 parts of paper pulp, 70 parts of magnesium aluminum hydrotalcite, 70 parts of functionalized diatomite, 180 parts of upper paper dyeing paint and 150 parts of lower paper developing paint;
the paper dyeing paint comprises: 80 parts of microcapsules, 60 parts of spacing agents, 20 parts of flame retardants, 15 parts of adhesives, 2 parts of thickening agents, 2 parts of water resistance agents and 1 part of surfactants;
the lower paper color developing paint comprises: 70 parts of kaolin, 50 parts of calcium carbonate, 12 parts of adhesive, 15 parts of color developing agent, 0.2 part of dispersing agent, 1 part of sodium carboxymethylcellulose, 0.1 part of foam inhibitor, 1.5 parts of lubricant and 0.2 part of preservative.
6. The preparation method of the carbon paper with flame retardant property is characterized by mainly comprising the following preparation steps:
(1) preparing microcapsules by taking melamine-formaldehyde resin as a wall material and taking leuco dye as a capsule core;
(2) mixing phosphorus pentoxide and chitosan to prepare a flame retardant, and mixing the flame retardant with microcapsules;
(3) preparing an upper paper dyeing paint and a lower paper color developing paint;
(4) using magnesium chloride to modify diatomite to obtain functional diatomite, adding the functional diatomite and the magnesium-aluminum hydrotalcite into raw paper pulp, stirring, making paper, squeezing and drying to obtain raw paper;
(5) and coating the upper paper dyeing paint on the back of the upper paper, and coating the lower paper color developing paint on the front of the lower paper to obtain the carbon paper.
7. The method for preparing carbon paper with flame retardant property as claimed in claim 6, which is characterized by mainly comprising the following preparation steps:
(1) mixing melamine with 37% of formaldehyde solution according to the mass ratio of 3: 5, mixing, stirring until the melamine is completely dissolved, adjusting the pH value of the system to 8.0-9.0 by using triethanolamine, and reacting for 75 minutes under the conditions of magnetic stirring at 70 ℃ and 300-500 r/min to prepare a melamine-formaldehyde prepolymer aqueous solution; mixing styrene-maleic anhydride copolymer and deionized water according to the mass ratio of 1: 19, mixing, emulsifying for 2 hours at 50 ℃ and under the condition that the pH value is 8.0-9.0, and then adjusting the pH value to 4.0-5.0 by using 10% by mass of citric acid to obtain a styrene-maleic anhydride sodium salt solution; mixing a leuco dye and a surfactant according to a mass ratio of 2: 1, uniformly mixing to obtain a mixture, and mixing the mixture and a styrene-maleic anhydride sodium salt solution according to a mass ratio of 9: 20, mixing, stirring and emulsifying under 2000r/min to be uniform to obtain core material emulsion; dripping the core material emulsion into a melamine-formaldehyde prepolymer aqueous solution at a speed of 15ml/min, wherein the mass ratio of the core material emulsion to the melamine-formaldehyde prepolymer aqueous solution is 11: 15, adjusting the pH value to 3.0-4.0 by using 10 mass percent of citric acid, heating to 80 ℃ under stirring at 400r/min, preserving heat for reaction for 2 hours, cooling to 40 ℃ after the reaction is finished, adjusting the pH value of the system to 8.5-9.0 by using 52 mass percent of sodium hydroxide solution, and continuously cooling to 30 ℃ to obtain a microcapsule aqueous solution;
(2) mixing chitosan, phosphorus pentoxide and 66% mass fraction methanesulfonic acid solution according to a mass ratio of 1: 5: 10, mixing, reacting in a zero-temperature ice water bath for 3 hours under the protection of nitrogen after chitosan is completely dissolved, then adding ether until no precipitate is generated, and washing precipitates obtained after filtering by using ether, acetone, methanol and ether in sequence to prepare phosphated chitosan; mixing phosphated chitosan and 2% of glacial acetic acid solution by volume percentage according to the mass ratio of 3: 2, mixing to obtain a phosphorized chitosan solution; transferring the microcapsule aqueous solution into a reaction kettle, heating to 180-200 ℃, introducing nitrogen into the reaction kettle at the aeration rate of 40ml/min, adding a Cu/C catalyst accounting for 5% of the mass of the microcapsule aqueous solution, reacting for 30 minutes, and cooling to room temperature to obtain the microcapsule aqueous solution with aldehyde groups on the capsule wall; mixing a phosphated chitosan solution and a microcapsule aqueous solution with aldehyde groups on the capsule wall according to the mass ratio of 1: 4, mixing, stirring at constant temperature of 40 ℃ and at the rotating speed of 300-500 r/min for reaction for 1 hour, standing after the reaction is finished, removing supernatant after complete layering, washing lower-layer substances for 3 times by using petroleum ether and deionized water in sequence, and drying in vacuum at 50 ℃ for 12 hours to obtain microcapsule powder with a flame retardant;
(3) adding an adhesive, a spacing agent and deionized water into a mixing tank in sequence, stirring at the rotating speed of 1800rpm/min for 5 minutes, adding a microcapsule, a thickening agent, a water resistance agent and a surfactant into the mixing tank in sequence, and stirring at the rotating speed of 1800rpm/min for 20-25 minutes to obtain a dyeing mixed slurry, wherein the mass ratio of the adhesive to the spacing agent to the microcapsule to the thickening agent to the water resistance agent to the surfactant to the deionized water is 15: 60: 80: 2: 2: 1: 30, filtering the dyed mixed slurry by using a 200-mesh sieve to form a paper dyeing paint; adding the foam inhibitor, the dispersing agent and deionized water into a dispersion tank in sequence, stirring at the rotating speed of 1200rpm/min for 5-8 minutes, adding calcium carbonate and kaolin into the dispersion tank, and stirring at the rotating speed of 1800rpm/min for 70 minutes to obtain a pigment dispersion liquid, wherein the mass ratio of the foam inhibitor, the dispersing agent, the calcium carbonate, the kaolin and the deionized water is 1: 2: 500: 800: 300, respectively; transferring the pigment dispersion liquid into a coating mixing tank, sequentially adding an adhesive, a color developing agent, sodium carboxymethylcellulose, a lubricant and a preservative into the coating mixing tank, stirring at the rotation speed of 1800rpm/min for 10-15 minutes, and then adjusting the pH value of the slurry to 4.0-5.0 by using 10% by mass of citric acid to obtain the color developing mixed slurry, wherein the mass ratio of the adhesive, the color developing agent, the sodium carboxymethylcellulose, the lubricant, the preservative and the pigment dispersion liquid is 120: 150: 10: 15: 2: 1603, filtering the color development mixed slurry by using a 200-mesh sieve to form lower paper color development coating;
(4) mixing diatomite, magnesium chloride solid and sodium hydroxide according to a mass ratio of 1: 1: 1.5, mixing, adding into a mortar, grinding until yellow solid at the bottom of the mortar completely disappears, placing in the air, aging for 12-14 hours, washing with distilled water, performing suction filtration for 3 times, and drying a filter cake obtained after suction filtration in a drying oven at 110 ℃ for 8-10 hours to obtain functional diatomite; the method comprises the following steps of (1): 1 adding the raw paper pulp into paper pulp, uniformly mixing to obtain raw paper pulp, making the raw paper pulp into paper sheets, pressing and drying at the temperature of 70-100 ℃ to obtain the paper sheets with the gram weight of 100-170 g/m2The base paper of (1);
(5) and coating the upper paper dyeing coating on one surface of the base paper, and coating the lower paper color developing coating on the other surface of the base paper to obtain the carbon paper.
8. The method for preparing carbon paper with flame retardant property as claimed in claim 7, wherein the leuco dye in step (1) is crystal violet lactone; the surfactant is OP-10 surfactant.
9. The method for preparing carbon paper with flame retardant property as claimed in claim 7, wherein the adhesive in step (3) is modified starch; the thickening agent is carboxymethyl cellulose; the spacing agent is wheat starch; the waterproof agent is glyoxal; the surfactant is sulfonated succinate; the foam inhibitor is polyether modified silicon; the dispersant is sodium polyacrylate; the color developing agent is phenolic resin; the lubricant is calcium stearate; the preservative is potassium sorbate.
10. The method for preparing carbon paper with flame retardant property according to claim 7, wherein the thickness of the paper dyeing coating in the step (5) is 10-15 μm; the thickness of the lower paper color development coating is 10-15 μm.
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