CN109403136A - A kind of composite coating and preparation method thereof promoting paper mechanical performance - Google Patents
A kind of composite coating and preparation method thereof promoting paper mechanical performance Download PDFInfo
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- CN109403136A CN109403136A CN201811295872.XA CN201811295872A CN109403136A CN 109403136 A CN109403136 A CN 109403136A CN 201811295872 A CN201811295872 A CN 201811295872A CN 109403136 A CN109403136 A CN 109403136A
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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
- 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
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- 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
- 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
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Abstract
The invention discloses a kind of composite coatings and preparation method thereof for promoting paper mechanical performance.It by mass parts include: 5-15 parts of polyvinyl alcohol, 0.05-1.5 parts of nanometer microfibril, 0.05-2.25 parts of sodium lignin sulfonate in every 100 parts of water.It is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixed liquor；Mixed liquor ultrasonic cleaner is dispersed 10-20 minutes, the nanometer microfibril solution after being dispersed；Polyvinyl alcohol is added in nanometer microfibril solution, then sufficiently dissolves polyvinyl alcohol at 90-95 DEG C, complex reagent is made；Complex reagent is dispersed 10-20 minutes under ultrasonic cleaner, composite coating is made after standing and defoaming.The present invention can be such that dispersibility of the composite coating on paper improves, and can greatly improve the mechanical performance of paper.
Description
Technical field
The present invention relates to a kind of composite coatings and preparation method thereof for promoting paper mechanical performance, belong to paper manufacture neck
Domain.
Background technique
With the fast development of social economy and science and technology, increasingly strict to the application requirement of paper, coating paper is in original
Coating is formed at least one surface of paper with being dried after pigment coating as main component, and coating paper can be through polychrome
As the commercial prints object such as poster, brochure, advertisement poster after printing or single color printing, or as publications such as books, magazines, from
And it is widely used in routine work and life, therefore the demand of coating paper is increasing.With paper quality
The continuous improvement of quality, to papermaking paint using more stringent requirements are proposed.And in this, the mechanical performance of paper is to measure
The mechanical performance of the important indicator of paper durability, paper affects ways and methods.The coating coated in existing coating paper
There are problems that bad dispersibility, and good mechanical performance cannot be provided for coating paper, causes the mechanical strength of paper low.
Summary of the invention
The object of the present invention is to provide a kind of composite coatings and preparation method thereof for promoting paper mechanical performance.This hair
The bright dispersibility that can improve composite coating on paper, and the mechanical performance of paper can be greatly improved.
Technical solution of the present invention: a kind of composite coating promoting paper mechanical performance presses mass parts packet in every 100 parts of water
It includes: 5-15 parts of polyvinyl alcohol, 0.05-1.5 parts of nanometer microfibril, 0.05-2.25 parts of sodium lignin sulfonate.
The composite coating of above-mentioned promotion paper mechanical performance by mass parts includes: polyvinyl alcohol 8-12 in every 100 parts of water
Part, 0.08-1.2 parts of nanometer microfibril, 0.1-1.8 parts of sodium lignin sulfonate.
The composite coating above-mentioned for promoting paper mechanical performance by mass parts includes: polyvinyl alcohol 10 in every 100 parts of water
Part, 0.8 part of nanometer microfibril, 1.5 parts of sodium lignin sulfonate.
The preparation method of the composite coating above-mentioned for promoting paper mechanical performance, sequentially includes the following steps:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 20kHz-30kHz to disperse 10-20 minutes, receiving after being dispersed
Rice microfibril solution；
C. polyvinyl alcohol is added in nanometer microfibril solution, then sufficiently dissolves polyvinyl alcohol at 85-95 DEG C, make
Obtain complex reagent；
D. complex reagent is put into ultrasonic cleaner at 20kHz-30kHz to disperse 10-20 minutes, is made after standing and defoaming
Obtain finished product.
The preparation method of the composite coating above-mentioned for promoting paper mechanical performance, sequentially includes the following steps:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 15 minutes, the nanometer microfibril after being dispersed
Solution；
C. polyvinyl alcohol is added in nanometer microfibril solution, then sufficiently dissolves polyvinyl alcohol at 90 DEG C, be made
Complex reagent；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 15 minutes, finished product after standing and defoaming.
The preparation method of the composite coating above-mentioned for promoting paper mechanical performance, in step c, the polyvinyl alcohol be
Polyvinylalcohol solids particle after 55-65 DEG C of water suction swollen.
The preparation method of the composite coating above-mentioned for promoting paper mechanical performance, in step c, polyethylene dissolving alcohol is in constant temperature
It is carried out in water-bath.
Compared with the prior art, the present invention is prepared using preferred component and proportion and obtains composite coating, a side of the invention
Face makes hydroxyl and nanometer microfibril colloid on sodium lignin sulfonate produce hydrogen bond by addition sodium lignin sulfonate, so that
Moisture is produced in nanometer microfibril colloid, in favor of preparing composite coating, while reaching and improving composite coating dispersibility
Effect, its dispersibility substantially improves after coating composite coating.On the other hand, the present invention makees polyvinyl alcohol and nanometer microfibril
It for the main component of composite coating, is combined between nanometer microfibril molecule and paper fibre, and adds sodium lignin sulfonate
With the hydroxy combining on nanometer microfibril, make to be tied between nanometer microfibril molecule, nanometer microfibril is intermolecular more to be stepped up
Close, active force is stronger, to enhance the binding force between paper fibre, so that paper tensile strength, paper folding strength, paper are torn
The mechanical performances such as degree of splitting greatly enhance.In addition, by polyvinyl alcohol be preferably 55-65 DEG C water suction swollen after polyvinylalcohol solids
Grain, can accelerate to dissolve.Due to the conventional surface paper-plastic package material Chang Qi plastic covering film, enhance resistance to degree of tearing etc., but very
Hardly possible is degraded in nature, be easy to cause environmental pollution, when with direct food contact, inside the pollutant that retains can pass through suction
The processes such as receipts, dissolution, diffusion are migrated to food, cause a degree of harm to human health and environment.Therefore, this hair
The bright polyvinyl alcohol and nanometer microfibril good using the feature of environmental protection and degradability are as composite coating raw material, so that it may reach conventional
Paper-plastic package material uses the mechanical property of plastic covering film just having, and has the advantages that environmentally protective, protection environment.
Detailed description of the invention:
Fig. 1: the dispersed comparison diagram of present invention composite coating under different sodium lignin sulfonate additive amounts；
Fig. 2: the present invention is under different sodium lignin sulfonate additive amounts to the line chart of paper tensile strength；
Fig. 3: present invention paper tensile strength comparison diagram under different nanometer microfibril additive amounts；
Fig. 4: the present invention is under different sodium lignin sulfonate additive amounts to the line chart of paper folding strength；
Fig. 5: present invention paper folding strength comparison diagram under different nanometer microfibril additive amounts；
Fig. 6: the present invention is under different sodium lignin sulfonate additive amounts to the line chart of paper tear degree；
Fig. 7: present invention paper tear degree comparison diagram under different nanometer microfibril additive amounts.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment 1: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 10g, nanometer microfibril 0.8g, sodium lignin sulfonate 0.1g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 10 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 85 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 10-14 minutes, is made after standing and defoaming compound
Coating.
Embodiment 2: a kind of composite coating promoting paper mechanical performance, includes: polyvinyl alcohol 10g, nanometer by weight
Microfibril 0.8g, sodium lignin sulfonate 0.3g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 13 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 87 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 13 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 3: a kind of composite coating promoting paper mechanical performance, includes: polyvinyl alcohol 10g, nanometer by weight
Microfibril 0.8g, sodium lignin sulfonate 0.5g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 16 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 89 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 16 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 4: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 10g, nanometer microfibril 0.8g, sodium lignin sulfonate 1g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 18 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 92 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 18 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 5: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 10g, nanometer microfibril 0.8g, sodium lignin sulfonate 1.5g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 15 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 90 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 15 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 6: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 10g, nanometer microfibril 0.8g, sodium lignin sulfonate 2g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 20 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 95 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 20 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 7: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 5g, nanometer microfibril 0.5g, sodium lignin sulfonate 1g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 20kHz to disperse 15 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 85 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 18 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 8: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 14g, nanometer microfibril 1.3g, sodium lignin sulfonate 1.85g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 30kHz to disperse 10 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 90 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 13 minutes, compound painting is made after standing and defoaming
Material.
Embodiment 9: it is a kind of promoted paper mechanical performance composite coating, include: by weight
Polyvinyl alcohol 12g, nanometer microfibril 0.5g, sodium lignin sulfonate 1.4g, water 100g.
The preparation method of above-mentioned composite coating carries out in the steps below:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixing
Liquid；
B. mixed liquor is put into ultrasonic cleaner at 25kHz to disperse 20 minutes, the nanometer microfibril after being dispersed
Solution；
C. the polyvinyl alcohol after the swollen that absorbs water is added at 60 DEG C in nanometer microfibril solution, then in thermostat water bath
Polyvinyl alcohol is sufficiently dissolved with 95 DEG C, complex reagent is made；
D. complex reagent is put into ultrasonic cleaner at 25kHz to disperse 19 minutes, compound painting is made after standing and defoaming
Material.
Reference examples 1: it by the configuration and preparation of progress composite coating the step of embodiment 1, but does not add in the feed wooden
The composite coating without sodium lignin sulfonate is made in plain sodium sulfonate.
Example 1-6 and the composite coating of reference examples are coated experiment, and coating experiment uses Switzerland Jie Ener
2300 hardened coating machine of zehntner company 2AA carries out, and paper source used by this experiment is limited in Zhejiang indigo plant space new material
Company, the quantification of 60g/m of paper2, used polyvinyl alcohol is technical grade 1799, and nanometer microfibril solid content is 1.1%.
Coating experiment by manual bar type coating in a manner of to paper carry out the processing of composite coating coating surface, in coating process, only into
The unidirectional coating of row, it is coated after the first dry 20min in 50 DEG C of baking oven of paper, then to place constant temperature humidity chamber (opposite
Humidity: 50%；Temperature: 25 DEG C) the dispersibility observation of progress composite coating afterwards for 24 hours, as a result as shown in Fig. 1.As shown in Figure 1,
When polyvinyl alcohol concentration (concentration described herein is mass percent concentration) is 10%, i.e. wrapped in 100 parts of water by weight
10 parts of polyvinyl alcohol are included, when the concentration of nanometer microfibril is 0.8%, i.e., water includes 0.8 part of nanometer fento by weight in 100 parts
Silk, with the increase of sodium lignin sulfonate additive amount, the little particle after coating on paper is gradually decreased, lignin in embodiment 1
The concentration of sodium sulfonate is 0.1%, i.e., by weight includes 0.1 part of sodium lignin sulfonate, sulfomethylated lignin in embodiment 2 in 100 parts
The concentration of sour sodium is 0.3%, and the concentration of sodium lignin sulfonate is 0.5% in embodiment 3, sodium lignin sulfonate in embodiment 5
Concentration is 1.5%, without sodium lignin sulfonate in reference examples, with sodium lignin sulfonate it can be seen from embodiment and reference examples
The increase of additive amount is become better and better in polyvinyl alcohol and the dispersibility of nanometer microfibril in the solution.The main reason is that poly- second
The dissolution of enol and nanometer microfibril all needs under aqueous conditions, and nanometer microfibril could only dissolve in water.When multiple
When concentration ratio both in conjunction coating is excessively high, it will lead to the water deficient of addition in the dissolution of nanometer microfibril, at this time will
There is granular nanometer microfibril.Hydroxyl when sodium lignin sulfonate sodium lignin sulfonate is added, on sodium lignin sulfonate
Hydrogen bond is produced with nanometer microfibril colloid, so that producing moisture in nanometer microfibril, in favor of preparing composite coating, together
When achieve the effect that improve composite coating dispersibility.
After the dispersibility experiment of paper after being coated with to composite coating, using composite coating made from embodiment 1-6 to paper
Be coated, in coating process, be only unidirectionally coated with, it is coated after paper first dried in 50 DEG C of baking oven
20min, then place constant temperature humidity chamber (relative humidity: 50%；Temperature: 25 DEG C) for 24 hours after, to paper carry out paper stretch it is strong
The mechanical performance detection of degree, paper folding strength and paper tear degree.
1, the detection of paper tensile strength is carried out to the paper after the coating of composite coating made from embodiment 1-6 and reference examples,
Paper tensile strength is analyzed using KSM-bx5450ST two-way stretching device.Testing conditions are as follows: coating paper width is 40mm, long
Degree is 100mm, and with a thickness of 0.14mm, sliding block weight is 10N.Final detection result is as shown in Fig. 2.By attached drawing 2 it is found that wooden
When the concentration of plain sodium sulfonate is more than 0.3% or more, the increase of the concentration of sodium lignin sulfonate has the increase of tensile strength bright
Aobvious effect.When the concentration of sodium lignin sulfonate is 0.1%, it is 45.97Mpa that tensile strength, which is minimum,.With wooden
The increase of plain sulfonic acid na concn, tensile strength are consequently increased, and when lignin sulfonic acid na concn 0.5%, corresponding stretching was answered
Than the 45-50% or more that increases of its concentration 0.1%, the tensile strength of paper significantly increases power, when sodium lignin sulfonate it is dense
When degree reaches the 1%-1.5% stage, the tensile strength enhancing amplitude of paper gradually tends towards stability.Working as lignin sulfonic acid na concn
When reaching the 1.5%-2% stage, the tensile strength of paper decreases.This is because since sodium lignin sulfonate is dissolved in water and produces
Raw ionization, and the degree ionized is big, forms the small cation of a big anion and equivalent xenogenesis charge.Negative ions jail
It is adsorbed on the surface of nanometer microfibril firmly, makes nanometer microfibril with identical charge.The ion of oppositely charged freely expands
It is scattered in surrounding liquid medium, forms the diffusion layer (i.e. electric double layer) of a charged ion.Since the ion with identical charges is mutual
Mutually repel, form electrostatic repulsion, prevent a nanometer microfibril from flocculating in an aqueous medium, to achieve the purpose that evenly dispersed, makes
After obtaining paper coating composite coating, it is combined between nanometer microfibril molecule and paper fibre, with sodium lignin sulfonate
The increase of additive amount, the sodium lignin sulfonate and the hydroxy combining on nanometer microfibril of addition, so that nanometer microfibril point
It is tied between son, reinforcing fiber binding force improves the tensile strength of paper.But when the sodium lignin sulfonate being added is excessive
When, the electric double layer formed can be destroyed, charge unbalance is caused to be distributed, causes nanometer microfibril dispersion uneven, to drop
The mechanical performance of low paper.
The number for adjusting nanometer microfibril in embodiment 1-6, by the number of nanometer microfibril in embodiment 1-6 by 0.8 part
Adjusting separately is 1 part and 0.2 part, i.e. the concentration of nanometer microfibril is adjusted to 1% and 0.2% from 0.8%, remaining step phase
Together, composite coating obtained is coated processing to paper, and paper tensile strength detection, paper tensile strength are then carried out to it
It is analyzed using KSM-bx5450ST two-way stretching device.Testing conditions are as follows: coating paper width is 40mm, length 100mm, thickness
Degree is 0.14mm, and sliding block weight is 10N.The nanometer microfibril of final detection result and 8% concentration compares paper tensile strength, knot
Fruit is as shown in Fig. 3.The concentration of nanometer microfibril is in 0.8% and 1% it can be seen from attached drawing 3, the tensile strength of paper
It is far longer than the nanometer microfibril of 0.2% concentration, illustrates that the content increase of nanometer microfibril has significantly the tensile strength of paper
The raising of property.But the concentration of nanometer microfibril is at 8%, than nanometer microfibril concentration paper at 10% tensile strength more
It is good, this is because the nanometer microfibril of various concentration adds in polyvinyl alcohol situation identical with the concentration of sodium lignin sulfonate
Dosage directly affects the dispersibility of coating.The nanometer microfibril of 0.8% or more concentration will appear itself agglomeration, lead to it
The effect of reinforcing fiber binding force is not had, so that the tensile strength of coating paper is when nanometer microfibril is in concentration 0.8%
Tensile strength is best, occurs downward trend instead after 0.8% or more concentration in nanometer microfibril.
2, the detection of paper folding strength is carried out to the paper after the coating of composite coating made from embodiment 1-6 and reference examples.Paper
The folding strength opened is analyzed using DCP-MIT135 computer observing and controlling folding strength instrument.Testing conditions are as follows: test pressure is 9.8N.Inspection
It is as shown in Fig. 4 to survey result.As shown in Figure 4, folding strength is with the increase of the additive amount of sodium lignin sulfonate and after first reducing
Increase.When containing 0.1% sodium lignin sulfonate, folding strength is 3.18, and when to 0.3%, folding strength is reduced to
Minimum 3.12, then with the addition of sodium lignin sulfonate, when lignin sulfonic acid na concn reaches the 1%-1.5% stage,
The folding strength enhancing amplitude of paper gradually tends towards stability.When lignin sulfonic acid na concn reaches the 1.5%-2% stage, paper
Folding strength decrease.As long as it follows that sodium lignin sulfonate reasonably add within the scope of, the folding strength of the paper
Ascendant trend should be presented.This is because containing sulfonic group in sodium lignin sulfonate, so that the sulfonic group on nanometer microfibril surface
It measures excessively high, results in that combination between fiber is opposite to be reduced, so that it is made to produce detrimental effect to paper performance, so
The folding strength for just causing coating paper the case where decline can occur with the addition of sodium lignin sulfonate.But with lignin sulfonic acid
The addition of sodium, influence of the sodium lignin sulfonate to nanometer microfibril is smaller and smaller, at the same time, with adding for sodium lignin sulfonate
The increase of dosage, the sodium lignin sulfonate and the hydroxy combining on nanometer microfibril of addition, plays nanometer microfibril molecular tie
Come, to keep nanometer microfibril intermolecular even closer, active force is stronger, to enhance the binding force between paper fibre, applies
The folding strength of cloth paper can also increase accordingly, but when the sodium lignin sulfonate of addition is excessive, can destroy the electric double layer formed,
Cause charge unbalance to be distributed, causes nanometer microfibril dispersion uneven, to reduce the mechanical performance of paper.
The number for adjusting nanometer microfibril in embodiment 1-6, by the number of nanometer microfibril in embodiment 1-6 by 0.8 part
It is adjusted to 1 part or 0.2 part, i.e. the concentration of nanometer microfibril is adjusted to 1% or 0.2% from 0.8%, remaining step is identical, is made
Composite coating processing is coated to paper, paper folding strength detection is then carried out to it.The folding strength of paper uses DCP-
MIT135 computer observing and controlling folding strength instrument is analyzed.Testing conditions are as follows: test pressure is 9.8N.Final detection result and 0.8%
The nanometer microfibril of concentration compares paper folding strength, as a result as shown in Fig. 5.It can be seen from attached drawing 5 concentration be 0.8% with
After the obtained composite coating coated paper of 1% nanometer of microfibril, the folding strength of paper is consistent in total trend, with wood
The increase of quality sodium sulfonate, recessed parabolic type is presented in folding strength, and its folding strength is much larger than 0.2% concentration nanometer microfibril
Paper illustrates that the content of nanometer microfibril increases the raising for having conspicuousness to the tensile strength of paper.Working as sodium lignin sulfonate
When concentration reaches the 10%-15% stage, the folding strength promotion of paper gradually tends towards stability.But 0.8% nanometer of microfibril adds
The test result that dosage comes out slightly is better than 1%.This is because the folding ability of paper is mainly by the intensity of fiber itself, flexible
The influence of the binding force of property, fibre length and fiber.In the case that the concentration of polyvinyl alcohol and sodium lignin sulfonate is certain,
As the additive amount of nanometer microfibril gradually increases, the further promotion so that the binding force of paper fibre has been got back, but
There is downward trend after 0.8% or more concentration instead in nanometer microfibril.
3, the detection of paper tear degree is carried out to the paper after the coating of composite coating made from embodiment 1-6 and reference examples.Paper
The tearability opened is analyzed using J-SLY1000 paper tear degree instrument.Testing result is as shown in Fig. 6.By attached drawing 6 it is found that
The tearability of paper and the trend of folding strength are consistent.The additive amount of sodium lignin sulfonate in proper range can make mechanical property
It can all be greatly improved.With sodium lignin sulfonate incrementss increase, the mechanical property of paper will appear fall before after
The trend of rising.When the additive amount of sodium lignin sulfonate is 0.3%, the either tearability or folding strength of coating paper, all
The minimum value in test scope, and more than 0.3% after, the additive amount of sodium lignin sulfonate has significantly the enhancing of tearability
Effect.Then with the addition of sodium lignin sulfonate, when lignin sulfonic acid na concn reaches the 1%-1.5% stage, paper
The tearability enhancing amplitude opened gradually tends towards stability.When sodium lignin sulfonate reaches the 1.5%-2% stage, the tearing of paper
Degree decreases.This is because after sodium lignin sulfonate is added, the hydroxyl and sodium lignin sulfonate of nanometer microfibril molecular surface
Molecule can generate horizontal hydrogen bond, reduce interfibrous binding force, so that downward trend is first presented in the tearability of coating paper.Work as wood
Quality sodium sulfonate be added to it is a certain amount of after, ascendant trend can be presented to the tearability of coating paper, because of sodium lignin sulfonate pair
The influence of nanometer microfibril is smaller and smaller, at the same time, with the increase of the additive amount of sodium lignin sulfonate, the lignin of addition
Hydroxy combining on sodium sulfonate and nanometer microfibril, makes a nanometer microfibril molecular tie, to make a nanometer microfibril molecule
Between it is even closer, active force is stronger, and influence of the sodium lignin sulfonate between binding force fiber can show a kind of positive state,
Enhance the binding force between paper fibre, the resistance to degree of tearing of coating paper can also increase accordingly.But when the sodium lignin sulfonate mistake being added
When more, the electric double layer formed can be destroyed, charge unbalance is caused to be distributed, cause nanometer microfibril dispersion uneven, thus
Reduce the mechanical performance of paper.
The number for adjusting nanometer microfibril in embodiment 1-6, by the number of nanometer microfibril in embodiment 1-6 by 0.8 part
Become 1 part or 0.2 part, i.e. the concentration of nanometer microfibril becomes 1% or 0.2% from 0.8%, remaining step is identical, obtained multiple
It closes coating and processing is coated to paper, paper tear degree detection is then carried out to it, the tearability of paper uses J-SLY1000
Paper tear degree instrument is analyzed.The nanometer microfibril of final detection result and 0.8% concentration compares paper tear degree, as a result such as
Shown in attached drawing 7.By it can be seen from attached drawing 7 0.8% with 1% concentration nanometer microfibril be made composite coating coated paper after, paper
The tearability opened is consistent in total trend, and with the increase of sodium lignin sulfonate, recessed parabola is presented in tearability, and
Its tearability is much larger than the paper of 0.2% concentration nanometer microfibril, illustrates tearing of the additive amount to paper of nanometer microfibril
Degree still has the raising of conspicuousness.When lignin sulfonic acid na concn reaches the 1%-1.5% stage, the tearability of paper is mentioned
It rises and gradually tends towards stability.But the test result that the concentration of 8% nanometer of microfibril comes out slightly is better than 1%.The tearing energy of paper
Power is mainly influenced by the binding force of the intensity of fiber itself, flexibility, fibre length and fiber.When polyvinyl alcohol with it is wooden
In the case that the concentration of plain sodium sulfonate is certain, as the additive amount of nanometer microfibril gradually increases, so that the combination of paper fibre
Power has been got back further promotion, but due to the concentration of nanometer microfibril at 0.8% or more its will appear itself reunite it is existing
As causing it not have the effect of reinforcing fiber binding force, therefore the paper folding after 0.8% or more concentration in nanometer microfibril
There is downward trend instead in ability and paper tear degree.
In conclusion one aspect of the present invention makes hydroxyl on sodium lignin sulfonate and receives by the way that sodium lignin sulfonate is added
Rice microfibril colloid produces hydrogen bond, so that producing moisture in nanometer microfibril colloid, in favor of preparing composite coating, together
When achieve the effect that improve composite coating dispersibility, make composite coating coat after its dispersibility substantially improve.On the other hand, this hair
It is bright by polyvinyl alcohol and nanometer microfibril as composite coating, be combined between nanometer microfibril molecule and paper fibre,
And sodium lignin sulfonate (5-20%) is added within the scope of reasonably, the hydroxyl knot on sodium lignin sulfonate and nanometer microfibril
It closes, makes to be tied between nanometer microfibril molecule, nanometer microfibril is intermolecular even closer, and active force is stronger, to enhance
Binding force between paper fibre, so that the mechanical performances such as paper tensile strength, paper folding strength, paper tear degree increase
By force.And be shown experimentally that composite coating ratio be most preferably in 100 parts by weight including 10 parts polyvinyl alcohol, 0.8 part
Nanometer microfibril and 1.5 parts of sodium lignin sulfonate, the component and the lower composite coating of proportion have optimal paper machinery
Performance.
Claims (7)
1. a kind of composite coating for promoting paper mechanical performance, it is characterised in that: by mass parts include: poly- second in every 100 parts of water
5-15 parts of enol, 0.05-1.5 parts of nanometer microfibril, 0.05-2.25 parts of sodium lignin sulfonate.
2. the composite coating according to claim 1 for promoting paper mechanical performance, it is characterised in that: pressed in every 100 parts of water
Mass parts include: 8-12 parts of polyvinyl alcohol, 0.08-1.2 parts of nanometer microfibril, 0.1-1.8 parts of sodium lignin sulfonate.
3. the composite coating according to claim 2 for promoting paper mechanical performance, it is characterised in that: pressed in every 100 parts of water
Mass parts include: 10 parts of polyvinyl alcohol, 0.8 part of nanometer microfibril, 1.5 parts of sodium lignin sulfonate.
4. the preparation method of the composite coating according to claim 1-3 for promoting paper mechanical performance, feature
It is: sequentially includes the following steps:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixed liquor；
B. mixed liquor is put under ultrasonic cleaner and is dispersed 10-20 minutes, the nanometer microfibril solution after being dispersed；
C. polyvinyl alcohol is added in nanometer microfibril solution, then sufficiently dissolves polyvinyl alcohol at 85-95 DEG C, be made multiple
Close reagent；
D. complex reagent is put under ultrasonic cleaner and is dispersed 10-20 minutes, finished product after standing and defoaming.
5. it is according to claim 4 promoted paper mechanical performance composite coating preparation method, it is characterised in that: by with
Lower step carries out:
A. it is proportionally added into a nanometer microfibril, sodium lignin sulfonate and water in a reservoir, stirs obtained mixed liquor；
B. mixed liquor is put under ultrasonic cleaner and is dispersed 15 minutes, the nanometer microfibril solution after being dispersed；
C. polyvinyl alcohol is added in nanometer microfibril solution, then sufficiently dissolves polyvinyl alcohol at 90 DEG C, be made compound
Reagent；
D. complex reagent is put under ultrasonic cleaner and is dispersed 15 minutes, finished product after standing and defoaming.
6. the preparation method of the composite coating according to claim 5 or 6 for promoting paper mechanical performance, it is characterised in that:
In step c, the polyvinyl alcohol is the polyvinylalcohol solids particle after absorbing water swollen at 55-65 DEG C.
7. the preparation method of the composite coating according to claim 5 or 6 for promoting paper mechanical performance, it is characterised in that:
In step c, polyethylene dissolving alcohol carries out in thermostat water bath.
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|---|---|---|---|---|
| CN101823358A (en) * | 2010-03-29 | 2010-09-08 | 南京林业大学 | Method for enhancing paperless membrane-coated artificial board by micro/nano fibril |
| CN102057105A (en) * | 2008-04-03 | 2011-05-11 | 英文蒂亚有限责任公司 | Composition for coating of printing paper |
| CN106833139A (en) * | 2016-12-24 | 2017-06-13 | 胡云 | A kind of preparation of cellulose nano-fibrous base oil fat barrier coat and its application process |
| WO2017199252A1 (en) * | 2016-05-16 | 2017-11-23 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd | Modified nanocrystaline cellulose materials and formulations and products made therefrom |
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2018
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102057105A (en) * | 2008-04-03 | 2011-05-11 | 英文蒂亚有限责任公司 | Composition for coating of printing paper |
| CN101823358A (en) * | 2010-03-29 | 2010-09-08 | 南京林业大学 | Method for enhancing paperless membrane-coated artificial board by micro/nano fibril |
| WO2017199252A1 (en) * | 2016-05-16 | 2017-11-23 | Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd | Modified nanocrystaline cellulose materials and formulations and products made therefrom |
| CN106833139A (en) * | 2016-12-24 | 2017-06-13 | 胡云 | A kind of preparation of cellulose nano-fibrous base oil fat barrier coat and its application process |
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