CN111622020B - Waterproof kraft paper with strong tensile property in length direction and preparation method thereof - Google Patents

Waterproof kraft paper with strong tensile property in length direction and preparation method thereof Download PDF

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Publication number
CN111622020B
CN111622020B CN202010361373.7A CN202010361373A CN111622020B CN 111622020 B CN111622020 B CN 111622020B CN 202010361373 A CN202010361373 A CN 202010361373A CN 111622020 B CN111622020 B CN 111622020B
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waterproof
paper
kraft paper
length direction
layer
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CN111622020A (en
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黄建超
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Fujian Minqing Shuangleng Paper Co ltd
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Fujian Minqing Shuangleng Paper 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
    • D21H27/10—Packing paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing compounds
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • 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
    • D21H17/675—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
    • D21H19/10—Coatings without pigments
    • 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
    • D21H21/16—Sizing or water-repelling 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
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to the technical field of kraft paper, and particularly discloses waterproof kraft paper with strong tensile property in the length direction and a preparation method thereof, wherein the waterproof kraft paper comprises a bottom layer and waterproof layers sprayed on two sides of the bottom layer, the bottom layer is base paper, needle leaf wood is used as a raw material, needle leaf wood fiber raw pulp is prepared by crushing, filtering, stewing, degumming, adding water and pulping, magnetic liquid is absorbed by soaking after a water reducing process, and then the base paper is manufactured, molded and squeezed and dehydrated in a unidirectional magnetic field environment to obtain the base paper; the waterproof layer is formed by coating a raw paper layer through a fog chamber filled with atomized waterproof coating after electrostatic treatment. The kraft paper of the invention has excellent tensile strength in the length direction after being treated by magnetic liquid and magnetic field, and the waterproof layer is prepared by electrostatic treatment and waterproof coating fog room, thus having good waterproof property.

Description

Waterproof kraft paper with strong tensile property in length direction and preparation method thereof
Technical Field
The invention relates to the technical field of kraft paper, and particularly discloses waterproof kraft paper with strong tensile property in the length direction and a preparation method thereof.
Background
Kraft paper is a common packaging paper material, has higher strength than common packaging paper, has a yellowish brown or yellow surface, has very excellent tensile property and breakage resistance, can not be broken under certain pulling and tearing, is in a roll shape and a flat plate shape in a common paper state, and can be used in places such as envelope paper, asphalt paper and the like.
As a kraft bag, in particular, a kraft bag for loading heavy objects is often found in most kraft papers on the market, which have uneven tensile properties and uneven tensile properties, and which cause the kraft bag to break and crack during use. Kraft paper in the market, which has uniform directional tensile capability and tensile strength superior to that of common kraft paper and waterproof performance, is still less.
Disclosure of Invention
The invention aims to provide waterproof kraft paper with strong tensile property in the length direction and a preparation method thereof, so as to solve the problems in the background technology.
The technical scheme of the invention is as follows:
in order to achieve the above purpose, the present invention provides the following technical solutions: the waterproof kraft paper comprises a bottom layer and waterproof layers sprayed on two sides of the bottom layer, wherein the bottom layer is base paper, needle wood is used as a raw material, water is added for pulping after smashing, filtering, stewing and degumming to prepare needle wood fiber raw pulp, the needle wood fiber raw pulp is soaked and absorbed with magnetic liquid after a water reducing process, and then the base paper is manufactured, molded and squeezed and dehydrated in a unidirectional magnetic field environment to obtain the base paper; the waterproof layer is formed by coating a raw paper layer through a fog chamber filled with atomized waterproof coating after electrostatic treatment.
The magnetic liquid is a ferrite magnetic liquid.
The preparation method of the ferrite magnetic liquid comprises the following steps:
(1) FeCl is added at room temperature 2 And FeCl 3 Dissolving in ethanol-containing solution in a ratio of 1:2, and adding excessive ammonia water in stirring to obtain ferrite magnetic particles;
(2) The ferrite magnetic liquid coated with oleic acid is prepared by coating oleic acid on the surface of ferrite magnetic particles as a surfactant, adding the surfactant into a mixed solvent of ethane and organic silicon (volume ratio is 1:1), continuously stirring at 50 ℃ for 1-3 hours until flocculate is completely dissolved in the solvent, and removing low-boiling-point components in vacuum for 1-3 hours.
The unidirectional magnetic field environment is that the magnetic field direction is along the length direction of kraft paper.
Further, the unidirectional magnetic field environment is generated by arranging N-level and S-level opposite to each other of two rectangular large magnets at the front side and the rear side of the papermaking cylinder respectively. The N-level and the S-level of the two magnets are opposite, and the direction of a unidirectional magnetic field formed by the two magnets is along the length direction of kraft paper, and the kraft paper is covered with a papermaking cylinder.
The waterproof layer consists of acrylic resin 10-20 weight portions, PVA 10-20 weight portions, cationic starch 5-10 weight portions, sodium dodecyl sulfate 3-5 weight portions and distilled water in balance.
The preparation method of the waterproof agent of the waterproof layer comprises the following steps:
(1) Pouring the formula amount of acrylic resin and polyvinyl alcohol into distilled water, heating to 85 ℃ and stirring for 10min;
(2) And (2) adding the cationic starch and the sodium dodecyl sulfate in the formula amount into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of the waterproof kraft paper with strong tensile property in the length direction comprises the following steps:
(1) Pulverizing She Muqie pieces of needles, filtering, steaming, degumming, adding water, pulping to a degree of beating of 30-40 deg. SR to obtain needle leaf wood fiber magma, mechanically extruding needle leaf wood fiber magma, primarily dewatering, uniformly spreading on a drying plate, feeding into a drying oven, drying at 100deg.C for 20-30 min to obtain needle leaf wood fiber magma after water reduction;
(2) Soaking needle leaf wood fiber raw pulp in prepared magnetic liquid for 10min, fishing out, placing the needle leaf wood fiber raw pulp into unidirectional magnetic fields which have magnetic induction intensity of 1.2-1.5T, are opposite in N level and S level of two rectangular large magnets along the length direction, are respectively placed in the front side and the rear side of a papermaking cylinder, carrying out ultrasonic magnetization for 1-2h, and then carrying out papermaking molding, squeezing, dewatering and drying to obtain bottom base paper;
(3) And (3) carrying out electrostatic treatment on the surface of the dried base paper of the bottom layer by adopting an electrostatic generator, conveying the base paper of the bottom layer after the electrostatic treatment into a fog chamber filled with the waterproof agent spray prepared in advance for 1-2h, finishing the preparation of a waterproof layer by the base paper through the electrostatic adsorption of the waterproof agent spray, and finally drying by a hot roller to obtain the waterproof kraft paper.
Wherein, the cooking specifically comprises: steaming the obtained filtrate at 100deg.C for 3-4 hr, adding 10% NaOH solution and 25% H 2 O 2 The solution is evenly mixed, reacts for 1-2 hours at the temperature of 80-90 ℃ and is steamed for 2-3 hours at the temperature of 100 ℃.
Wherein, the degumming specifically comprises: adding glacial acetic acid and nitric acid solution with mass fraction of 25% into the obtained steamed and boiled matter, uniformly mixing, reacting at 120 ℃ for 1-2h, cooling, and washing with water to neutrality.
The squeezing step adopts four-roller three-pressure compound squeezing, and the line pressure of each area is as follows: one zone of 5.5MPa, two pressure zones of 6.5MPa, three pressure zones of 5MPa and four pressure zones of 5MPa.
The invention has the following beneficial effects:
compared with the prior art, the kraft paper has the beneficial effects that the kraft paper has strong tensile property in the length direction and is waterproof:
1. the Magnetic Liquids (Magnetic Liquids) are not liquid Magnetic materials, but are uniform colloidal solutions formed by highly dispersing nanoscale ultrafine Magnetic particles treated with a surfactant in a base liquid. The solution can not be condensed and precipitated under the action of gravity and a magnetic field, and has the magnetism of solid and the fluidity of liquid, so that the solution has a plurality of unique properties. The prepared needle leaf wood fiber raw pulp is immersed in magnetic liquid with a majority of long fibers, and the needle leaf wood fiber has magnetism due to the absorption of the magnetic liquid.
On the one hand, the needle wood fibers absorbing the magnetic liquid in the primary pulp tend to be arranged in the same direction under the action of a unidirectional magnetic field along the length direction (the action of two magnets outside the papermaking cylinder) like a miniature magnet, and the fibers extend along the length direction; on the other hand, ultrasonic vibration is simultaneously carried out in a unidirectional magnetic field environment, so that the needle wood fibers tend to be arranged in the same direction and extend along the length direction, and the ultrasonic vibration is also beneficial to the dispersion of overlapped and clustered long fibers to form compact and uniform monolayer distribution. The needle leaf wood fibers tend to be arranged in the same direction, a denser structure can be formed, and the tensile strength of kraft paper in the fixed direction (length direction) is greatly improved. Kraft paper having excellent tensile properties in the lengthwise direction also exhibits the superiority of tensile strength in the direction sufficiently even when rolled and formed into paper bags in the direction.
2. The water reducing process is to simply squeeze partial primary pulp water from the primary pulp of the needle-leaf wood fibers by mechanical extrusion, fully scatter the squeezed primary pulp, uniformly spread the primary pulp on a drying plate, send the drying plate into a drying oven, and further remove the water in the primary pulp in the drying process at 100 ℃ to obtain the primary pulp of the needle-leaf wood fibers after water reduction. The purpose of the water reducing process is to remove most of the water in the needle wood fiber primary pulp, so that the needle wood fiber primary pulp after water reduction can better absorb the magnetic liquid in the next step, and the needle wood fiber can fully absorb the magnetic liquid to carry out magnetism.
3. After the base paper of the bottom layer prepared in the invention is subjected to static treatment by the static generator, the base paper of the bottom layer with static on the surface enters a fog chamber filled with waterproofing agent spray for placement (the waterproofing agent spray in the fog chamber is supplemented in real time, the concentration of the waterproofing agent spray in the fog chamber is ensured), and the base paper is helped to uniformly and fully adsorb the waterproofing agent spray drops in the fog chamber to the two surfaces of the base paper of the bottom layer by static to form a waterproof layer. Because of the electrostatic effect, the waterproof layer adsorbed by the base paper of the bottom layer has no adsorption dead angle, and the waterproof layer is ensured to be thin and uniformly distributed on the two surfaces of the base paper of the bottom layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
preparation of a ferrimagnetic liquid: (1) FeCl is added at room temperature 2 And FeCl 3 Dissolving in ethanol-containing solution in a ratio of 1:2, and adding excessive ammonia water in stirring to obtain ferrite magnetic particles; (2) The ferrite magnetic liquid coated with oleic acid is prepared by coating oleic acid on the surface of ferrite magnetic particles as a surfactant, adding the surfactant into a mixed solvent of ethane and organic silicon (volume ratio is 1:1), continuously stirring at 50 ℃ for 1 hour until flocculate is completely dissolved in the solvent, and removing low-boiling-point components in vacuum for 1 hour.
The waterproof agent comprises 10 parts by weight of acrylic resin, 10 parts by weight of polyvinyl alcohol, 5 parts by weight of cationic starch, 3 parts by weight of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent comprises the following steps: (1) Pouring the formula amount of acrylic resin and polyvinyl alcohol into distilled water, heating to 85 ℃ and stirring for 10min; (2) And (2) adding the cationic starch and the sodium dodecyl sulfate in the formula amount into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of kraft paper comprises the following steps:
(1) Pulverizing She Muqie pieces, filtering, steaming at 100deg.C for 3 hr, adding 10% NaOH solution and 25% H 2 O 2 Uniformly mixing the solutions, performing heat preservation reaction for 1h at 80-90 ℃, and steaming at 100 ℃ for 2h to obtain a steamed product;
(2) Adding glacial acetic acid and nitric acid solution with the mass fraction of 25% into the cooked product obtained in the step (1), uniformly mixing, reacting for 1h at 120 ℃, cooling, washing to be neutral, adding water, pulping to the beating degree of 30 DEG SR to obtain needle leaf wood fiber raw pulp, mechanically extruding the needle leaf wood fiber raw pulp to carry out preliminary dehydration, scattering, uniformly spreading on a drying plate, sending into a drying oven, and drying at 100 ℃ for 20 min to obtain the needle leaf wood fiber raw pulp after water reduction;
(3) Soaking needle leaf wood fiber raw pulp in prepared magnetic liquid for 10min, fishing out, placing the needle leaf wood fiber raw pulp into unidirectional magnetic fields which have magnetic induction intensity of 1.2T, are opposite in N level and S level of two rectangular large magnets along the length direction, are respectively arranged at the front side and the rear side of a papermaking cylinder, carrying out ultrasonic magnetization for 1h, carrying out papermaking forming, carrying out three-pressure compound pressing by four rollers (the linear pressure of each zone is 5.5MPa in one zone, 6.5MPa in two zones, 5MPa in three zones and 5MPa in four zones), and drying to obtain base layer raw paper;
(4) And carrying out electrostatic treatment on the surface of the dried base paper of the bottom layer by adopting an electrostatic generator, conveying the base paper of the bottom layer after the electrostatic treatment into a fog chamber filled with the waterproof agent spray prepared in advance for 1h, finishing the preparation of the waterproof layer by the base paper through the electrostatic adsorption waterproof agent spray, and finally drying by a hot roller to obtain the waterproof kraft paper.
Example 2:
preparation of a ferrimagnetic liquid: (1) FeCl is added at room temperature 2 And Fe (Fe)Cl 3 Dissolving in ethanol-containing solution in a ratio of 1:2, and adding excessive ammonia water in stirring to obtain ferrite magnetic particles; (2) The ferrite magnetic liquid coated with oleic acid is prepared by coating oleic acid on the surface of ferrite magnetic particles as a surfactant, adding the surfactant into a mixed solvent of ethane and organic silicon (volume ratio is 1:1), continuously stirring at 50 ℃ for 2 hours until flocculate is completely dissolved in the solvent, and removing low-boiling-point components in vacuum for 2 hours.
The waterproof agent comprises 15 parts of acrylic resin, 20 parts of polyvinyl alcohol, 8 parts of cationic starch, 4 parts of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent comprises the following steps: (1) Pouring the formula amount of acrylic resin and polyvinyl alcohol into distilled water, heating to 85 ℃ and stirring for 10min; (2) And (2) adding the cationic starch and the sodium dodecyl sulfate in the formula amount into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of kraft paper comprises the following steps:
(1) Pulverizing She Muqie pieces, filtering, steaming at 100deg.C for 3.5 hr, adding 10% NaOH solution and 25% H 2 O 2 Uniformly mixing the solutions, performing heat preservation reaction at 80-90 ℃ for 1.5 hours, and steaming at 100 ℃ for 2.5 hours to obtain a steamed product;
(2) Adding glacial acetic acid and nitric acid solution with the mass fraction of 25% into the cooked product obtained in the step (1), uniformly mixing, reacting for 1.5 hours at 120 ℃, cooling, washing to be neutral, adding water, pulping to the beating degree of 35 DEG SR to obtain needle leaf wood fiber raw pulp, mechanically extruding the needle leaf wood fiber raw pulp for preliminary dehydration, scattering, uniformly spreading on a drying plate, sending into a drying oven, and drying at 100 ℃ for 25 minutes to obtain the needle leaf wood fiber raw pulp after water reduction;
(3) Soaking needle leaf wood fiber raw pulp in prepared magnetic liquid for 10min, fishing out, placing the needle leaf wood fiber raw pulp into unidirectional magnetic fields which have magnetic induction intensity of 1.4T, are opposite in N level and S level of two rectangular large magnets along the length direction, are respectively arranged on the front side and the rear side of a papermaking cylinder, carrying out ultrasonic magnetization for 1.5h, carrying out papermaking forming, carrying out three-pressure compound pressing through four rollers (the linear pressure of each region is one region 5.5MPa, two pressure regions 6.5MPa, three pressure regions 5MPa and four pressure regions 5 MPa), and drying to obtain base layer raw paper;
(4) And (3) carrying out electrostatic treatment on the surface of the dried base paper of the bottom layer by adopting an electrostatic generator, conveying the base paper of the bottom layer after the electrostatic treatment into a fog chamber filled with the waterproof agent spray prepared in advance for 1.5 hours, finishing the preparation of a waterproof layer by the base paper through the electrostatic adsorption waterproof agent spray, and finally drying by a hot roller to obtain the waterproof kraft paper.
Example 3:
preparation of a ferrimagnetic liquid: (1) FeCl is added at room temperature 2 And FeCl 3 Dissolving in ethanol-containing solution in a ratio of 1:2, and adding excessive ammonia water in stirring to obtain ferrite magnetic particles; (2) The ferrite magnetic liquid coated with oleic acid is prepared by coating oleic acid on the surface of ferrite magnetic particles as a surfactant, adding the surfactant into a mixed solvent of ethane and organic silicon (volume ratio is 1:1), continuously stirring at 50 ℃ for 3 hours until flocculate is completely dissolved in the solvent, and removing low-boiling-point components by vacuum for 3 hours.
The waterproof agent comprises 20 parts of acrylic resin, 15 parts of polyvinyl alcohol, 10 parts of cationic starch, 5 parts of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent comprises the following steps: (1) Pouring the formula amount of acrylic resin and polyvinyl alcohol into distilled water, heating to 85 ℃ and stirring for 10min; (2) And (2) adding the cationic starch and the sodium dodecyl sulfate in the formula amount into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of kraft paper comprises the following steps:
(1) Pulverizing She Muqie pieces, filtering, steaming at 100deg.C for 4 hr, adding 10% NaOH solution and 25% H 2 O 2 Uniformly mixing the solutions, performing heat preservation reaction for 2 hours at 80-90 ℃, and steaming at 100 ℃ for 3 hours to obtain a steamed product;
(2) Adding glacial acetic acid and nitric acid solution with the mass fraction of 25% into the cooked product obtained in the step (1), uniformly mixing, reacting for 2 hours at 120 ℃, cooling, washing to be neutral, adding water, pulping to the beating degree of 40 DEG SR to obtain needle leaf wood fiber raw pulp, mechanically extruding the needle leaf wood fiber raw pulp to carry out preliminary dehydration, scattering, uniformly spreading on a drying plate, sending into a drying oven, and drying at 100 ℃ for 30 minutes to obtain the needle leaf wood fiber raw pulp after water reduction;
(3) Soaking needle leaf wood fiber raw pulp in prepared magnetic liquid for 10min, fishing out, placing the needle leaf wood fiber raw pulp into unidirectional magnetic fields which have magnetic induction intensity of 1.5T, are opposite in N level and S level of two rectangular large magnets along the length direction, are respectively arranged at the front side and the rear side of a papermaking cylinder, carrying out ultrasonic magnetization for 2h, carrying out papermaking forming, carrying out three-pressure compound pressing by four rollers (the linear pressure of each zone is 5.5MPa in one zone, 6.5MPa in two zones, 5MPa in three zones and 5MPa in four zones), and drying to obtain base layer raw paper;
(4) And (3) carrying out electrostatic treatment on the surface of the dried base paper of the bottom layer by adopting an electrostatic generator, conveying the base paper of the bottom layer after the electrostatic treatment into a fog chamber filled with the waterproof agent spray prepared in advance for 2h, finishing the preparation of the waterproof layer by the base paper through the electrostatic adsorption waterproof agent spray, and finally drying by a hot roller to obtain the waterproof kraft paper.
Comparative example 1:
on the basis of the embodiment 3, no magnetic liquid is prepared, the needle leaf wood fiber raw pulp is not immersed in the magnetic liquid, a magnetic field along the length direction is not required to be overlapped in the papermaking process to directly perform papermaking forming, and then waterproof kraft paper is prepared by adsorbing a waterproof layer on the base paper according to the formula and the preparation parameters of the embodiment 3.
Comparative example 2:
on the basis of the embodiment 3, no magnetic liquid is prepared, the needle leaf wood fiber raw pulp is not immersed in the magnetic liquid, the magnetic field along the length direction is not required to be overlapped in the papermaking process to directly perform papermaking forming, and the kraft paper is not subjected to the next adsorption preparation of a waterproof layer, so that the kraft paper is obtained.
Performance testing aspects: kraft paper was prepared according to the methods in examples 1-3, comparative examples 1-2, and properties of the prepared kraft paper were examined according to the following methods: the quantitative, burst, tear and water absorption properties of kraft papers prepared in examples and comparative examples were measured according to the standard requirements of GB/T22865-2008 kraft paper, and the experimental results were as follows:
TABLE 1 Performance test results for examples 1-3, comparative examples 1-2
Project Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2
Quantitative g/m 2 100 100 100 100 100
Longitudinal tear mN 2 /g 9.0 9.2 9.5 8.1 7.8
Burst kPa x m 2 /g 3.79 3.86 3.97 2.72 2.54
Water absorption g/m 2 28 27 25 31 39
From the experimental results of table 1 we can see:
by combining comparative examples 1-2 and examples 1-3, the length-direction tensile strength, namely the longitudinal tear strength and the bursting strength of the prepared kraft paper can be greatly improved by immersing the needle leaf wood fiber raw pulp in the magnetic liquid and performing ultrasonic papermaking by a magnetic field. Because the needle wood fibers absorbing the magnetic liquid in the primary pulp tend to be arranged in the same direction under the action of a magnetic field along the length direction (the action of two magnets outside the papermaking cylinder) like a miniature magnet, the fibers extend along the length direction, a more compact structure can be formed, and the tensile strength of kraft paper in the fixed direction (length direction) is greatly improved
In comparative examples 1-3, example 3 has the best performance, on one hand, the longer the drying time of the needle wood pulp after mechanical extrusion and drying, the less water content remains, the more magnetic liquid the pulp can absorb, which is helpful for the ordered arrangement of needle wood fiber pulp in the magnetic field; on the other hand, the stronger the applied magnetic field strength is, the longer the magnetic field covering time and the ultrasonic time are, which is favorable for the needle leaf wood fiber magma of the magnetic liquid of the lower hand to tend to be arranged in the same direction and extend along the length direction, and the ultrasonic vibration is also favorable for the overlapping and clustered long fibers to be dispersed to form compact and uniform monolayer distribution, so that the longitudinal tear and bursting strength of kraft paper are improved.
In comparative example 3 and comparative examples 1 to 2, the base paper of the bottom layer was treated electrostatically and then absorbed by the fog chamber filled with the waterproofing agent fog to finish the waterproofing effect of spraying the waterproofing layer, the absorbed waterproofing layer was thin and complete, and the kraft paper absorbed with the waterproofing layer had a water absorption significantly lower than that of kraft paper without spraying or coating the waterproofing layer.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.

Claims (4)

1. Waterproof kraft paper that tensile strength is strong at length direction, its characterized in that: the waterproof kraft paper comprises a bottom layer and waterproof layers sprayed on two sides of the bottom layer, wherein the bottom layer is base paper, needle wood is used as a raw material, water is added for pulping after smashing, filtering, stewing and degumming to prepare needle wood fiber raw pulp, the needle wood fiber raw pulp is soaked and absorbed with magnetic liquid after a water reducing process, and then the base paper is manufactured, molded and squeezed and dehydrated in a unidirectional magnetic field environment to obtain the base paper; the waterproof layer is formed by coating a raw paper layer through a fog chamber filled with atomized waterproof paint after electrostatic treatment; the magnetic liquid is a ferrite magnetic liquid; the unidirectional magnetic field environment is that the magnetic field direction is along the length direction of kraft paper; the preparation method of the waterproof kraft paper with strong tensile property in the length direction comprises the following steps:
(1) Pulverizing She Muqie pieces of needles, filtering, steaming, degumming, adding water, pulping to a degree of beating of 30-40 deg. SR to obtain needle leaf wood fiber magma, mechanically extruding needle leaf wood fiber magma, primarily dewatering, uniformly spreading on a drying plate, feeding into a drying oven, drying at 100deg.C for 20-30 min to obtain needle leaf wood fiber magma after water reduction;
(2) Soaking the reduced needle leaf wood fiber raw pulp in the prepared magnetic liquid for 10min, fishing out, putting the needle leaf wood fiber raw pulp into unidirectional magnetic fields which have magnetic induction intensity of 1.2-1.5T, are opposite in N level and S level of two rectangular large magnets along the length direction, respectively are arranged on the front side and the rear side of a papermaking cylinder, carrying out ultrasonic magnetization for 1-2h, and then carrying out papermaking molding, squeezing, dewatering and drying to obtain base layer raw paper;
(3) Carrying out electrostatic treatment on the surface of the dried base paper of the bottom layer by adopting an electrostatic generator, conveying the base paper of the bottom layer after the electrostatic treatment into a fog chamber filled with a waterproof agent spray prepared in advance for 1-2h, finishing the preparation of a waterproof layer by the base paper through the electrostatic adsorption of the waterproof agent spray, and finally drying by a hot roller to obtain waterproof kraft paper;
the waterproof layer consists of acrylic resin 10-20 weight portions, PVA 10-20 weight portions, cationic starch 5-10 weight portions, sodium dodecyl sulfate 3-5 weight portions and distilled water in balance.
2. The waterproof kraft paper having strong tensile properties in the length direction according to claim 1, wherein: the preparation method of the waterproof agent of the waterproof layer comprises the following steps: (1) Pouring the formula amount of acrylic resin and polyvinyl alcohol into distilled water, heating to 85 ℃ and stirring for 10min; (2) And (2) adding the cationic starch and the sodium dodecyl sulfate in the formula amount into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
3. The waterproof kraft paper having strong tensile properties in the length direction according to claim 1, wherein: the cooking specifically comprises the following steps: steaming the obtained filtrate at 100deg.C for 3-4 hr, adding 10% NaOH solution and 25% H 2 O 2 The solution is evenly mixed, reacts for 1-2 hours at the temperature of 80-90 ℃ and is steamed for 2-3 hours at the temperature of 100 ℃.
4. A waterproof kraft paper having strong lengthwise tensile properties according to claim 1 or 3, characterized in that: the degumming is specifically as follows: adding glacial acetic acid and nitric acid solution with mass fraction of 25% into the obtained steamed and boiled matter, uniformly mixing, reacting at 120 ℃ for 1-2h, cooling, and washing with water to neutrality; the squeezing step adopts four-roller three-pressure compound squeezing, and the line pressure of each area is as follows: one zone of 5.5MPa, two pressure zones of 6.5MPa, three pressure zones of 5MPa and four pressure zones of 5MPa.
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