CN111411541A - Preparation process of talcum powder composite material filled paper - Google Patents

Preparation process of talcum powder composite material filled paper Download PDF

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Publication number
CN111411541A
CN111411541A CN202010307527.4A CN202010307527A CN111411541A CN 111411541 A CN111411541 A CN 111411541A CN 202010307527 A CN202010307527 A CN 202010307527A CN 111411541 A CN111411541 A CN 111411541A
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talcum powder
solution
paper
pulp
composite
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段尚军
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02—Synthetic cellulose fibres
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/30—Alginic acid or alginates
    • 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
    • D21H17/38—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing crosslinkable groups
    • 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

Abstract

The invention relates to the technical field of papermaking, and discloses a preparation process of talcum powder composite material filled paper. The method comprises the following steps: a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemico-mechanical pulp to obtain papermaking pulp; b) adding a sizing agent, a dry strength agent and a wet strength agent into the papermaking pulp obtained in the step a), uniformly stirring, and then adding a talcum powder composite filler to obtain composite papermaking pulp; c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper; d) putting the semi-finished paper obtained in the step c) into an oil press for squeezing treatment, and then carrying out microwave drying treatment to obtain the paper. The paper filler obtained by the invention has higher retention rate and higher mechanical strength.

Description

Preparation process of talcum powder composite material filled paper
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation process of talcum powder composite material filled paper.
Background
At present, the supply and the demand of paper making industry and paper boards are increased year by year, the plant fiber resource is limited, and the paper making filler is one of important paper making raw materials, and the demand of the paper making filler is increased or not reduced. The common paper making fillers comprise calcium carbonate, kaolin, talcum powder, titanium dioxide and the like. The addition of the inorganic filler can not only significantly reduce the papermaking cost, but also significantly improve the dimensional stability, smoothness, optical properties and printing adaptability of the paper. The filling in the paper making production aims at making paper obtain certain special performance, saving fiber material and lowering cost, and the filling of paper can also change the water filtering performance of pulp, raise the opacity, whiteness, glossiness, smoothness, air permeability, size stability, ink absorption, printing adaptability, writing adaptability, etc. of paper and reduce paper making energy consumption. However, the retention rate of the traditional filler is low, so that more filler is consumed, the combination between fibers is hindered by the existence of the inorganic filler, and the strength of the paper after the filler is added is adversely affected.
Chinese patent publication No. CN106958166 discloses a paper containing bentonite and its preparation method, the first step is drying bentonite, grinding into powder, the second step is mixing bentonite powder, talcum powder, softwood pulp, waste paper and water, stirring and beating, the concentration of the prepared paper pulp is 5-8%, the third step is adding retention aid, paper pulp dispersant and antioxidant, after stirring uniformly, pouring the pulp into a mould, and pressing and forming; and fourthly, drying the pulp obtained by compression molding, and then cutting and molding to obtain a finished product.
In the above patent documents, bentonite and talc are used as fillers for paper, and since the bentonite and talc have small particle sizes, a large amount of fillers are lost from paper in the press molding step, resulting in low retention of fillers and high consumption of fillers, and the presence of inorganic fillers hinders inter-fiber bonding, resulting in a decrease in mechanical strength of paper.
Chinese patent publication No. CN106049171 discloses a preparation method of modified talcum powder for adding paper filler, which comprises 1, preparing aqueous solution from carboxymethyl chitosan, trehalose, vitamin C, instant CMC and water by weighing according to parts by weight at normal temperature; 2. adding talcum powder and purified water, fully stirring and mixing uniformly, continuously and fully stirring and mixing the solution prepared in the step 1 uniformly, adding the magnesium sulfate solution once again, continuously stirring for 5min, washing and filtering the modified talcum powder suspension; 3. and re-dispersing the modified talcum powder in water, and drying by using microwave to obtain the modified talcum powder.
In the patent documents, the surface of the talcum powder is modified by using carboxymethyl chitosan and trehalose, so that the surface of the talcum powder is organized, the bonding acting force between the talcum powder filler and the pulp fiber is improved, and the bonding acting force between paper fibers is prevented from being damaged by the inorganic filler.
Disclosure of Invention
The invention provides a preparation process of talcum powder composite material filled paper, aiming at overcoming the technical problem that the paper filler retention rate and the paper strength cannot be optimized simultaneously. The paper filler obtained by the invention has higher retention rate and higher mechanical strength.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation process of talcum powder composite material filled paper comprises the following steps:
a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemimechanical pulp according to the mass ratio of 1:3-5:0.5-1 to obtain papermaking pulp;
b) adding a sizing agent, a dry strength agent and a wet strength agent into the papermaking pulp obtained in the step a), uniformly stirring, then adding a talcum powder composite filler, and uniformly stirring to obtain composite papermaking pulp;
c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper;
d) putting the semi-finished paper obtained in the step c) into an oil press for squeezing treatment, and then carrying out microwave drying treatment to obtain the paper.
Preferably, the addition amount of the talcum powder composite filler in the step b) is 15-25wt% of the papermaking pulp.
Preferably, the pressure set in the pressing process in the step d) is 0.35-0.40 MPa.
Preferably, the microwave drying power in the step d) is 400-500W; the microwave drying time is 40-50 min.
Preferably, the preparation method of the talcum powder composite filler in the step b) comprises the following steps:
1) adding an epoxy silane coupling agent into deionized water, stirring and dissolving to obtain a silane coupling agent solution, adjusting the pH of the silane coupling agent solution to 3-5, then adding talcum powder into the silane coupling agent solution, heating to 50-60 ℃, stirring and reacting for 1-2h, carrying out suction filtration, and drying to obtain alkylated talcum powder; adding the alkylated talcum powder into a triethylene tetramine solution, heating to 80-85 ℃, keeping the temperature, reacting for 1-3h, carrying out suction filtration, and drying to obtain talcum powder loaded with triethylene tetramine;
2) adding cellulose fiber into a sodium alginate solution, stirring and dispersing, adding a dicyclohexylcarbodiimide dehydrating agent, heating to 60-90 ℃, carrying out heat preservation reaction for 3-6h, taking out and drying to obtain the cellulose fiber loaded with the sodium alginate;
3) adding talcum powder loaded with triethylene tetramine into deionized water, performing ultrasonic oscillation dispersion to obtain a suspension, adjusting the pH value of the suspension to 5-6, adding cellulose fiber loaded with sodium alginate into the suspension, uniformly stirring, standing for 2-5h, taking out, drying to obtain talcum powder composite fiber, and cutting the talcum powder composite fiber into short fibers to obtain the talcum powder composite filler.
Preferably, the concentration of the triethylene tetramine solution in the step 1) is 1.0-5.5 wt%.
Preferably, the concentration of the sodium alginate solution in the step 2) is 3.5-7.0 wt%.
Preferably, the talcum powder composite fiber is subjected to modification treatment: adding sodium hydroxide into a polyvinyl acetate solution for alcoholysis to obtain an alcoholysis solution, adding a carboxymethyl chitosan solution into the alcoholysis solution, and uniformly stirring to obtain a mixed solution; soaking the talcum powder composite fiber in the mixed solution for 2-3h, taking out, then placing in a sodium tripolyphosphate solution, adjusting the pH to 3-5, carrying out a crosslinking reaction at 45-60 ℃ for 1-2h, taking out, and then placing in an oven for drying to obtain the composite fiber.
Preferably, the mass ratio of the polyvinyl acetate to the carboxymethyl chitosan is 1: 0.3-0.6.
Preferably, the concentration of the sodium tripolyphosphate solution is 0.5-1.5 wt%.
According to the invention, the talcum powder is loaded on the surface of the cellulose fiber to obtain the fibrous talcum powder composite filler, the filler is not easy to run off from paper in the paper making step, and compared with the unmodified filler with a small particle size, the retention rate of the filler is greatly improved; in addition, the talcum powder composite filler can form stronger hydrogen bond acting force with hydroxyl on paper fibers. The paper filler retention rate and the paper strength can be simultaneously optimized, and unnecessary waste of the filler is reduced.
According to the invention, the talcum powder and the cellulose fiber are combined to obtain the talcum powder composite filler in the preparation method process of the talcum powder composite filler, and the talcum powder is deposited and combined on the surface of the cellulose fiber by adopting a conventional deposition method, so that the talcum powder needs to be deposited on the surface of the cellulose fiber for a long time, the amount of the talcum powder deposited and combined on the surface of the cellulose fiber is small, and the loading capacity of the fiber is low. According to the invention, the talcum powder and the cellulose fiber are respectively modified to respectively prepare the talcum powder loaded with the triethylene tetramine and the cellulose fiber loaded with the sodium alginate. The talcum powder loaded with triethylene tetramine is prepared by grafting an epoxy silane coupling agent on the surface of talcum powder, and then utilizing an epoxy group on an epoxy silane coupling agent molecule to perform a ring-opening reaction with an amino group on a triethylene tetramine molecule, so that the triethylene tetramine is grafted on the surface of the talcum powder, and an amino group is loaded on the surface of the talcum powder; the cellulose fiber loaded with sodium alginate is prepared by utilizing the dehydration condensation reaction of carboxyl and hydroxyl on the surface of the cellulose fiber and hydroxyl on sodium alginate molecules, thereby grafting the sodium alginate on the surface of the cellulose fiber. Under the acidic condition, the amino carried on the surface of the talcum powder is protonated, so that triethylene tetramine molecules are positively charged, and sodium alginate grafted on the surface of cellulose fibers is negatively charged in an aqueous solution due to an anionic compound. In addition, in the exposed area of the surface of the cellulose fiber, hydrogen bond acting force is formed between hydroxyl on the cellulose fiber and paper fiber, so that the bonding acting force between the talcum powder filler and the paper fiber is improved, and the mechanical strength of the paper is further improved.
In the process of mixing and stirring the talcum powder composite filler and the paper pulp, the talcum powder on the surface of the cellulose fiber in the talcum powder composite filler is easy to fall off under the action of stirring friction, so that the bonding structure of the cellulose fiber and the talcum powder is damaged. According to the invention, the talcum powder composite fiber is modified, polyvinyl acetate is hydrolyzed to generate polyvinyl alcohol, and the polyvinyl alcohol, carboxymethyl chitosan and hydroxyl on the surface of the cellulose fiber are subjected to a crosslinking reaction under the action of a crosslinking agent sodium tripolyphosphate, so that a three-dimensional network coated polymer layer is formed on the surface of the talcum powder composite fiber through crosslinking, and thus, the talcum powder is prevented from falling off from the surface of the cellulose fiber. On the other hand, the three-dimensional network coating polymer layer generated by the polyvinyl alcohol and the carboxymethyl chitosan is loaded with more hydroxyl groups, and compared with the original cellulose fiber, the three-dimensional network coating polymer layer has a larger contact area with the paper fiber, so that the hydrogen bond acting force between the filler and the paper fiber is improved, and the mechanical strength of the paper is further improved.
Detailed Description
The raw materials, equipment and the like used in the present invention are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
Sodium alginate used in the specific examples: viscosity is 20-100mPa.s, granularity is 100-120 meshes, water content is less than or equal to 15.0%, water-insoluble substance is less than or equal to 0.6%, pH value is 6-8, viscosity reduction rate is less than or equal to 20%, Shandong Fengtai Biotech Co., Ltd; talc powder: particle size of 5.0-8.0 μm, and specific surface area of 0.5-0.8m2Per g, whiteness is 95%, and the chemical company of Oersona in Jiangyun city; cellulose fiber: specific gravity of 1.10, standard diameter of 18 μm, specific surface area of 25000cm2(ii)/g, tensile strength 600-; polyvinyl acetate: type S3343H, viscosity 35-55mpa.s (10% ethyl acetate)Solution 20 ℃), average molecular weight 360000, Nicotiana new materials science and technology Limited; carboxymethyl chitosan: viscosity of 25 deg.C 50-200mpa.s, degree of substitution greater than or equal to 80.0%, pH 6-8, Nantong Lvqingshen bioengineering Co.
Example 1
The preparation method of the talcum powder composite filler comprises the following steps:
1) adding gamma-glycidoxypropyltrimethoxysilane into deionized water according to the mass ratio of 1:60, stirring and dissolving to obtain a silane coupling agent solution, adjusting the pH of the silane coupling agent solution to 3, then adding talcum powder into the silane coupling agent solution, wherein the mass ratio of the talcum powder to the gamma-glycidoxypropyltrimethoxysilane is 1:0.2, heating in a water bath to 60 ℃, stirring and reacting for 1 hour, filtering, and drying to obtain alkylated talcum powder;
adding triethylene tetramine into deionized water, stirring and dissolving to prepare a triethylene tetramine solution with the concentration of 5.0 wt%, adding alkylated talcum powder into the triethylene tetramine solution, heating to 85 ℃, keeping the temperature for reaction for 2 hours, performing suction filtration, and drying to obtain talcum powder loaded with triethylene tetramine;
2) adding sodium alginate into a mixed solvent of deionized water and dimethylformamide, stirring and dissolving to prepare a sodium alginate solution with the concentration of 6.0 wt%, wherein the volume ratio of the deionized water to the dimethylformamide in the mixed solvent is 1:1, adding cellulose fiber into the sodium alginate solution, stirring and dispersing, adding a dicyclohexylcarbodiimide dehydrating agent, heating to 60 ℃, carrying out heat preservation reaction for 5 hours, taking out and drying to obtain the cellulose fiber loaded with the sodium alginate;
3) adding talcum powder loaded with triethylene tetramine into deionized water according to the mass-volume ratio of 1g/80m L for ultrasonic oscillation and dispersion to obtain suspension, adjusting the pH of the suspension to 6, adding cellulose fiber loaded with sodium alginate into the suspension, stirring uniformly, standing for 4h, taking out and drying to obtain talcum powder composite fiber;
adding ethanol into polyvinyl acetate, stirring and dissolving to prepare a polyvinyl acetate solution with the concentration of 3 wt%, adding sodium hydroxide with the mass of 2% of that of the polyvinyl acetate into the polyvinyl acetate solution, stirring and alcoholyzing to obtain an alcoholysis solution, adding a carboxymethyl chitosan solution with the mass concentration of 1% into the alcoholysis solution, wherein the mass ratio of the polyvinyl acetate to the carboxymethyl chitosan is 1:0.5, and uniformly stirring to obtain a mixed solution; soaking the talcum powder composite fiber in the mixed solution for 3h, taking out, then placing in a sodium tripolyphosphate aqueous solution with the mass concentration of 1.0 wt%, adjusting the pH to 3, carrying out crosslinking reaction at 50 ℃ for 1.5h, taking out, then placing in an oven for drying, and obtaining the modified talcum powder composite fiber;
and cutting the modified talcum powder composite fiber into short fibers with the length of 0.5mm to prepare the talcum powder composite filler.
The preparation process of the talcum powder composite material filled paper comprises the following steps:
a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemimechanical pulp according to the mass ratio of 1:3:0.5 to obtain papermaking pulp;
b) adding a sizing agent AKD, a dry strength agent XQ-07 and a wet strength agent PAE into the papermaking pulp obtained in the step a), wherein the sizing agent AKD, the dry strength agent XQ-07 and the wet strength agent PAE respectively account for 0.5%, 0.2% and 0.1% of the mass of the papermaking pulp, stirring for 1h at 500r/min, then adding a talcum powder composite filler accounting for 20% of the mass of the papermaking pulp, and stirring for 30min at 800r/min to obtain composite papermaking pulp;
c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper;
d) c), placing the semi-finished paper obtained in the step c) into an oil press, pressing for 5min under 0.38MPa, and then performing microwave drying treatment, wherein the microwave drying power is 500W; drying with microwave for 40 min.
Example 2
The preparation method of the talcum powder composite filler comprises the following steps:
1) adding gamma-glycidoxypropyltrimethoxysilane into deionized water according to the mass ratio of 1:60, stirring and dissolving to obtain a silane coupling agent solution, adjusting the pH of the silane coupling agent solution to 5, then adding talcum powder into the silane coupling agent solution, wherein the mass ratio of the talcum powder to the gamma-glycidoxypropyltrimethoxysilane is 1:0.2, heating in a water bath to 50 ℃, stirring and reacting for 2 hours, carrying out suction filtration, and drying to obtain alkylated talcum powder;
adding triethylene tetramine into deionized water, stirring and dissolving to prepare a triethylene tetramine solution with the concentration of 2.0 wt%, adding alkylated talcum powder into the triethylene tetramine solution, heating to 80 ℃, keeping the temperature, reacting for 1.5 hours, performing suction filtration, and drying to obtain talcum powder loaded with triethylene tetramine;
2) adding sodium alginate into a mixed solvent of deionized water and dimethylformamide, stirring and dissolving to prepare a sodium alginate solution with the concentration of 4.0 wt%, wherein the volume ratio of the deionized water to the dimethylformamide in the mixed solvent is 1:1, adding cellulose fiber into the sodium alginate solution, stirring and dispersing, adding a dicyclohexylcarbodiimide dehydrating agent, heating to 90 ℃, carrying out heat preservation reaction for 4 hours, taking out, and drying to obtain the cellulose fiber loaded with the sodium alginate;
3) adding talcum powder loaded with triethylene tetramine into deionized water according to the mass-volume ratio of 1g/80m L for ultrasonic oscillation and dispersion to obtain suspension, adjusting the pH of the suspension to 5, adding cellulose fiber loaded with sodium alginate into the suspension, stirring uniformly, standing for 3h, taking out and drying to obtain talcum powder composite fiber;
adding ethanol into polyvinyl acetate, stirring and dissolving to prepare a polyvinyl acetate solution with the concentration of 3 wt%, adding sodium hydroxide with the mass of 2% of that of the polyvinyl acetate into the polyvinyl acetate solution, stirring and alcoholyzing to obtain an alcoholysis solution, adding a carboxymethyl chitosan solution with the mass concentration of 1% into the alcoholysis solution, wherein the mass ratio of the polyvinyl acetate to the carboxymethyl chitosan is 1:0.4, and uniformly stirring to obtain a mixed solution; soaking the talcum powder composite fiber in the mixed solution for 2h, taking out, then placing in a sodium tripolyphosphate aqueous solution with the mass concentration of 0.8 wt%, adjusting the pH to 5, carrying out crosslinking reaction at 50 ℃ for 1.5h, taking out, then placing in an oven for drying, and obtaining the modified talcum powder composite fiber;
and cutting the modified talcum powder composite fiber into short fibers with the length of 0.5mm to prepare the talcum powder composite filler.
The preparation process of the talcum powder composite material filled paper comprises the following steps:
a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemimechanical pulp according to the mass ratio of 1:5:1 to obtain papermaking pulp;
b) adding a sizing agent AKD, a dry strength agent XQ-07 and a wet strength agent PAE into the papermaking pulp obtained in the step a), wherein the sizing agent AKD, the dry strength agent XQ-07 and the wet strength agent PAE respectively account for 0.5%, 0.2% and 0.1% of the mass of the papermaking pulp, stirring for 1h at 500r/min, then adding a talcum powder composite filler accounting for 20% of the mass of the papermaking pulp, and stirring for 30min at 800r/min to obtain composite papermaking pulp;
c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper;
d) c), placing the semi-finished paper obtained in the step c) into an oil press, pressing for 5min under 0.38MPa, and then performing microwave drying treatment, wherein the microwave drying power is 400W; drying with microwave for 50 min.
Example 3
The preparation method of the talcum powder composite filler comprises the following steps:
1) adding gamma-glycidoxypropyltrimethoxysilane into deionized water according to the mass ratio of 1:60, stirring and dissolving to obtain a silane coupling agent solution, adjusting the pH of the silane coupling agent solution to 4, then adding talcum powder into the silane coupling agent solution, wherein the mass ratio of the talcum powder to the gamma-glycidoxypropyltrimethoxysilane is 1:0.2, heating in a water bath to 55 ℃, stirring and reacting for 1.5 hours, carrying out suction filtration, and drying to obtain alkylated talcum powder;
adding triethylene tetramine into deionized water, stirring and dissolving to prepare a triethylene tetramine solution with the concentration of 5.5wt%, adding alkylated talcum powder into the triethylene tetramine solution, heating to 82 ℃, keeping the temperature, reacting for 3 hours, performing suction filtration, and drying to obtain talcum powder loaded with triethylene tetramine;
2) adding sodium alginate into a mixed solvent of deionized water and dimethylformamide, stirring and dissolving to prepare a sodium alginate solution with the concentration of 7.0wt%, wherein the volume ratio of the deionized water to the dimethylformamide in the mixed solvent is 1:1, adding cellulose fiber into the sodium alginate solution, stirring and dispersing, adding a dicyclohexylcarbodiimide dehydrating agent, heating to 70 ℃, carrying out heat preservation reaction for 6 hours, taking out and drying to obtain the cellulose fiber loaded with the sodium alginate;
3) adding talcum powder loaded with triethylene tetramine into deionized water according to the mass-volume ratio of 1g/80m L for ultrasonic oscillation and dispersion to obtain suspension, adjusting the pH of the suspension to 5.5, adding cellulose fiber loaded with sodium alginate into the suspension, uniformly stirring, standing for 5 hours, taking out and drying to obtain talcum powder composite fiber;
adding ethanol into polyvinyl acetate, stirring and dissolving to prepare a polyvinyl acetate solution with the concentration of 3 wt%, adding sodium hydroxide with the mass of 2% of that of the polyvinyl acetate into the polyvinyl acetate solution, stirring and alcoholyzing to obtain an alcoholysis solution, adding a carboxymethyl chitosan solution with the mass concentration of 1% into the alcoholysis solution, wherein the mass ratio of the polyvinyl acetate to the carboxymethyl chitosan is 1:0.6, and uniformly stirring to obtain a mixed solution; soaking the talcum powder composite fiber in the mixed solution for 2.5h, taking out, then placing into a sodium tripolyphosphate aqueous solution with the mass concentration of 1.5wt%, adjusting the pH to 4, carrying out crosslinking reaction at 60 ℃ for 2h, taking out, then placing in an oven for drying, and obtaining the modified talcum powder composite fiber;
and cutting the modified talcum powder composite fiber into short fibers with the length of 0.5mm to prepare the talcum powder composite filler.
The preparation process of the talcum powder composite material filled paper comprises the following steps:
a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemimechanical pulp according to the mass ratio of 1:4:0.8 to obtain papermaking pulp;
b) adding a sizing agent AKD, a dry strength agent XQ-07 and a wet strength agent PAE into the papermaking pulp obtained in the step a), wherein the sizing agent AKD, the dry strength agent XQ-07 and the wet strength agent PAE respectively account for 0.5%, 0.2% and 0.1% of the mass of the papermaking pulp, stirring for 1h at 500r/min, then adding a talcum powder composite filler accounting for 25% of the mass of the papermaking pulp, and stirring for 30min at 800r/min to obtain composite papermaking pulp;
c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper;
d) c), placing the semi-finished paper obtained in the step c) into an oil press, pressing for 5min under 0.40MPa, and then performing microwave drying treatment, wherein the microwave drying power is 450W; drying with microwave for 45 min.
Example 4
The preparation method of the talcum powder composite filler comprises the following steps:
1) adding gamma-glycidoxypropyltrimethoxysilane into deionized water according to the mass ratio of 1:60, stirring and dissolving to obtain a silane coupling agent solution, adjusting the pH of the silane coupling agent solution to 4, then adding talcum powder into the silane coupling agent solution, wherein the mass ratio of the talcum powder to the gamma-glycidoxypropyltrimethoxysilane is 1:0.2, heating in a water bath to 55 ℃, stirring and reacting for 1.5 hours, carrying out suction filtration, and drying to obtain alkylated talcum powder;
adding triethylene tetramine into deionized water, stirring and dissolving to prepare a 1.0 wt% triethylene tetramine solution, adding alkylated talcum powder into the triethylene tetramine solution, heating to 82 ℃, keeping the temperature, reacting for 1 hour, performing suction filtration, and drying to obtain talcum powder loaded with triethylene tetramine;
2) adding sodium alginate into a mixed solvent of deionized water and dimethylformamide, stirring and dissolving to prepare a sodium alginate solution with the concentration of 3.5 wt%, wherein the volume ratio of the deionized water to the dimethylformamide in the mixed solvent is 1:1, adding cellulose fiber into the sodium alginate solution, stirring and dispersing, adding a dicyclohexylcarbodiimide dehydrating agent, heating to 80 ℃, carrying out heat preservation reaction for 3 hours, taking out, and drying to obtain the cellulose fiber loaded with the sodium alginate;
3) adding talcum powder loaded with triethylene tetramine into deionized water according to the mass-volume ratio of 1g/80m L for ultrasonic oscillation and dispersion to obtain suspension, adjusting the pH of the suspension to 5.5, adding cellulose fiber loaded with sodium alginate into the suspension, uniformly stirring, standing for 2 hours, taking out and drying to obtain talcum powder composite fiber;
adding ethanol into polyvinyl acetate, stirring and dissolving to prepare a polyvinyl acetate solution with the concentration of 3 wt%, adding sodium hydroxide with the mass of 2% of that of the polyvinyl acetate into the polyvinyl acetate solution, stirring and alcoholyzing to obtain an alcoholysis solution, adding a carboxymethyl chitosan solution with the mass concentration of 1% into the alcoholysis solution, wherein the mass ratio of the polyvinyl acetate to the carboxymethyl chitosan is 1:0.3, and uniformly stirring to obtain a mixed solution; soaking the talcum powder composite fiber in the mixed solution for 2.5h, taking out, then placing in a sodium tripolyphosphate aqueous solution with the mass concentration of 0.5 wt%, adjusting the pH to 4, carrying out crosslinking reaction for 1h at 45 ℃, taking out, then placing in an oven for drying, and obtaining the modified talcum powder composite fiber;
and cutting the modified talcum powder composite fiber into short fibers with the length of 0.5mm to prepare the talcum powder composite filler.
The preparation process of the talcum powder composite material filled paper comprises the following steps:
a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemimechanical pulp according to the mass ratio of 1:4:0.8 to obtain papermaking pulp;
b) adding a sizing agent AKD, a dry strength agent XQ-07 and a wet strength agent PAE into the papermaking pulp obtained in the step a), wherein the sizing agent AKD, the dry strength agent XQ-07 and the wet strength agent PAE respectively account for 0.5%, 0.2% and 0.1% of the mass of the papermaking pulp, stirring for 1h at 500r/min, then adding a talcum powder composite filler accounting for 15% of the mass of the papermaking pulp, and stirring for 30min at 800r/min to obtain composite papermaking pulp;
c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper;
d) c), placing the semi-finished paper obtained in the step c) into an oil press, pressing for 5min under 0.35MPa, and then performing microwave drying treatment, wherein the microwave drying power is 450W; drying with microwave for 45 min.
Comparative example 1:
comparative example 1 differs from example 1 in that the talc composite filler is replaced by a conventional talc filler in paper making step b).
Comparative example 2:
the comparative example 2 differs from example 1 in that the talc composite fibers were not modified in step 3) of the preparation of the talc composite filler.
Testing the paper performance:
the paper performance detection is carried out in a pulping and papermaking constant temperature and humidity standard laboratory, and the detection is carried out after the paper sample is subjected to constant temperature and humidity for 24 hours, wherein the temperature is (23 +/-1) DEG C, and the relative humidity is (50 +/-2)%. Determining the paper bursting index and the ring pressure index according to a test method specified in GB/T454-2002; the paper tensile index is determined according to the test method specified in GB/T453-2. The retention of the filler was determined using a retention determinator. The pulp filler retention (%) was measured using a vimard retention determinator.
Figure BDA0002456291670000091
The paper obtained in examples 1-4 has better burst index, ring crush index and tensile index than comparative examples 1 and 2, and the tensile strength of the paper obtained in the examples can reach above 80.67N.m/g, thus proving that the paper prepared by the invention has better mechanical strength compared with the comparative examples.
The mechanical strength of the paper prepared in the embodiment is superior to that of the paper prepared in the comparative example 1, and the fact that the talcum powder composite filler can endow the paper with better mechanical strength compared with the paper filled with the common talcum powder filler is proved. This is because the talc powder composite filler of the present invention can form a strong hydrogen bonding force with hydroxyl groups on paper fibers. The mechanical strength of the paper prepared in the embodiment is superior to that of the paper prepared in the comparative example 2, and the fact that the mechanical strength of the paper can be further improved after the talcum powder composite fiber is subjected to modification treatment is proved. The three-dimensional network coating polymer layer generated by the polyvinyl alcohol and the carboxymethyl chitosan is loaded with more hydroxyl, and compared with the original cellulose fiber, the three-dimensional network coating polymer layer has a larger contact area with the paper fiber, so that the hydrogen bond acting force between the filler and the paper fiber is improved, and the mechanical strength of the paper is further improved.
The retention rate of the paper prepared in the examples 1-4 can reach more than 96 percent, and the retention rate is far higher than that of the paper prepared in the comparative example 1, because the talcum powder is combined on the surface of the cellulose fiber, the volume of the filler is increased, and the filler is not easy to filter from paper pulp; in addition, the hydroxyl groups on the surface of the cellulose fibers form hydrogen bonding forces with the pulp fibers, preventing the filler from leaching out of the slurry. The paper sheets prepared in examples 1-4 had higher retention than comparative example 2 because the talc fell from the surface of the cellulose fibers during the mixing of the talc composite filler with the pulp, and the fallen talc filler was less bulky and easier to filter from the pulp, resulting in a lower retention of the paper filler. According to the invention, polyvinyl acetate is hydrolyzed to generate polyvinyl alcohol, and the polyvinyl alcohol, carboxymethyl chitosan and hydroxyl on the surface of the cellulose fiber are subjected to a crosslinking reaction under the action of a crosslinking agent sodium tripolyphosphate, so that a three-dimensional network coated polymer layer is formed on the surface of the talcum powder composite fiber through crosslinking, thus the talcum powder is prevented from falling off from the surface of the cellulose fiber, and the retention rate of the filler is improved.

Claims (10)

1. A preparation process of talcum powder composite material filled paper is characterized by comprising the following steps:
a) uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide chemimechanical pulp according to the mass ratio of 1:3-5:0.5-1 to obtain papermaking pulp;
b) adding a sizing agent, a dry strength agent and a wet strength agent into the papermaking pulp obtained in the step a), uniformly stirring, then adding a talcum powder composite filler, and uniformly stirring to obtain composite papermaking pulp;
c) pouring the composite papermaking pulp obtained in the step b) into a mesh paper machine for papermaking to obtain semi-finished paper;
d) putting the semi-finished paper obtained in the step c) into an oil press for squeezing treatment, and then carrying out microwave drying treatment to obtain the paper.
2. The process according to claim 1, wherein the talc composite filler is added in an amount of 15-25wt% based on the paper making pulp in step b).
3. The process for preparing talc composite filled paper according to claim 1, wherein the pressure set during pressing in step d) is 0.35-0.40 MPa.
4. The process for preparing talc powder composite filled paper as claimed in claim 1, wherein the microwave drying power in step d) is 400-500W; the microwave drying time is 40-50 min.
5. The process for preparing the talcum powder composite filled paper according to claim 1, wherein the preparation method of the talcum powder composite filler in the step b) comprises the following steps:
1) adding an epoxy silane coupling agent into deionized water, stirring and dissolving to obtain a silane coupling agent solution, adjusting the pH of the silane coupling agent solution to 3-5, then adding talcum powder into the silane coupling agent solution, heating to 50-60 ℃, stirring and reacting for 1-2h, carrying out suction filtration, and drying to obtain alkylated talcum powder; adding the alkylated talcum powder into a triethylene tetramine solution, heating to 80-85 ℃, keeping the temperature, reacting for 1-3h, carrying out suction filtration, and drying to obtain talcum powder loaded with triethylene tetramine;
2) adding cellulose fiber into a sodium alginate solution, stirring and dispersing, adding a dicyclohexylcarbodiimide dehydrating agent, heating to 60-90 ℃, carrying out heat preservation reaction for 3-6h, taking out and drying to obtain the cellulose fiber loaded with the sodium alginate;
3) adding talcum powder loaded with triethylene tetramine into deionized water, performing ultrasonic oscillation dispersion to obtain a suspension, adjusting the pH value of the suspension to 5-6, adding cellulose fiber loaded with sodium alginate into the suspension, uniformly stirring, standing for 2-5h, taking out, drying to obtain talcum powder composite fiber, and cutting the talcum powder composite fiber into short fibers to obtain the talcum powder composite filler.
6. The process for preparing the talc composite filled paper according to claim 5, wherein the concentration of the triethylene tetramine solution in step 1) is 1.0-5.5 wt%.
7. The process for preparing talc composite filled paper according to claim 5, wherein said sodium alginate solution concentration in step 2) is 3.5-7.0 wt%.
8. The process for preparing the talcum powder composite material filled paper according to claim 5, wherein the talcum powder composite fibers in the step 3) are subjected to modification treatment: adding sodium hydroxide into a polyvinyl acetate solution for alcoholysis to obtain an alcoholysis solution, adding a carboxymethyl chitosan solution into the alcoholysis solution, and uniformly stirring to obtain a mixed solution; soaking the talcum powder composite fiber in the mixed solution for 2-3h, taking out, then placing in a sodium tripolyphosphate solution, adjusting the pH to 3-5, carrying out a crosslinking reaction at 45-60 ℃ for 1-2h, taking out, and then placing in an oven for drying to obtain the composite fiber.
9. The process for preparing the talcum powder composite material filled paper according to claim 8, wherein the mass ratio of the polyvinyl acetate to the carboxymethyl chitosan is 1: 0.3-0.6.
10. The process for preparing talc composite filled paper according to claim 8, wherein said sodium tripolyphosphate solution has a concentration of 0.5-1.5 wt%.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113481757A (en) * 2021-07-08 2021-10-08 百草边大生物科技(青岛)有限公司 Preparation method of big biological paper containing bioactive components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113481757A (en) * 2021-07-08 2021-10-08 百草边大生物科技(青岛)有限公司 Preparation method of big biological paper containing bioactive components

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