CN111691236B - Production method of quick-drying bible paper - Google Patents
Production method of quick-drying bible paper Download PDFInfo
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- CN111691236B CN111691236B CN202010455154.5A CN202010455154A CN111691236B CN 111691236 B CN111691236 B CN 111691236B CN 202010455154 A CN202010455154 A CN 202010455154A CN 111691236 B CN111691236 B CN 111691236B
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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
- D21H27/30—Multi-ply
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- 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
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
-
- 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
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- 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
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
-
- 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
- D21H27/30—Multi-ply
- D21H27/32—Multi-ply with materials applied between the sheets
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Abstract
The invention relates to the field of paper manufacturing, in particular to a production method of quick-drying biblical paper, which comprises the following steps: (1) mixing and stirring the fiber raw material, titanium dioxide, sodium carboxymethylcellulose and water; (2) forming on a net, dehydrating and drying to obtain ultrathin paper sheets; (3) bonding the ultrathin paper sheets with each other by using a bonding agent containing a silane-based polymer; (4) carrying out double-sided sizing by using a filler containing a branched polyhydroxy polymerization sizing agent, a retention aid and a lubricant; (5) and then dewatering, drying and calendaring to obtain the quick-drying bible paper. According to the invention, the polyhydroxy polymerization sizing agent is used for sizing the paper sheet, so that the number of hydroxyl groups on the surface of the paper sheet is increased, the water absorption capacity of the paper sheet is improved, the rapid separation of water and pigment components after the paper sheet absorbs ink is ensured, the effect of quick drying is achieved, hydrogen bonds are formed between the polyhydroxy polymerization sizing agent and the hydroxyl groups on the cellulose on the surface of the paper sheet, and the strength of the paper sheet is improved; the hydrophobic layer is added in the middle of the paper, so that the paper is ensured not to have strike-through after absorbing water.
Description
Technical Field
The invention relates to the field of paper manufacturing, in particular to a production method of quick-drying bible paper.
Background
The bible paper is a high-grade thin printing paper and is mainly used for printing bible books and is supplied to foreign professions; the paper is thin, tough, folding-resistant, slightly transparent, white and fine in paper surface, compact and smooth in texture and certain in water resistance, is mainly used for printing books which have more pages, higher use frequency and convenience in carrying, such as biblical bibliography, high-end dictionaries, classical books and the like, and is also applied to printing information data of aviation express; since bible papers are mostly published by professors for donations, are used in large quantities and are relatively inexpensive, low-basis weight leaflet bible readings are derived.
For example, publication No. CN110565442A, "a method for producing an ultra-low basis weight bible paper", comprises the steps of: uniformly mixing the fiber raw material and titanium dioxide, then carrying out pulping operation, and then adding a filler; diluting the mixed slurry to a mass concentration of 0.5-1.0%, sequentially adding polyamide epoxy chloropropane resin, cationic starch, polyethyleneimine, black dye and alkyl ketene dimer, and performing net-feeding forming treatment; then, carrying out press dehydration and pre-drying treatment, gluing the two sides of the paper by using a glue applicator, carrying out post-drying, and finally carrying out calendaring treatment by using a calendar. The invention has the advantages of high long fiber proportion ratio, high beating and knocking degree, sufficient fibrillation of the fibers, high paper strength and difficult occurrence of paper breaking in the process of processing; the addition amount of the titanium dioxide in the filler is increased, and the addition mode is improved, so that the product has high opacity, is not easy to have printing strike-through phenomenon, still has higher strength under the condition of extremely thin paper, and meets the requirement of continuous paper printing; better evenness and opacity.
The strength of the bible paper is improved on the premise of keeping low basis weight, but with the improvement of technology and the change of production modes, higher requirements are provided for the flatness and the water absorption control of the base paper: the water absorption of the base paper is too low, the paper has strong ink penetration resistance, and the transfer ink is accumulated on the surface layer of the paper and is difficult to dry quickly, so that dirt holding and plate pasting are caused; the raw paper has too high water absorption, large ink absorption capacity, and the paper is softened and becomes transparent and is easy to break and penetrate the bottom, and if the paper flatness is not good enough, the ink absorption is easy to be uneven, so that the overprinting is caused to be problematic and the printing effect is inconsistent. The bible paper prepared by the invention cannot meet the requirement of paper on larger ink absorption amount, under the printing and spraying of larger ink amount or water amount, the bible paper of the invention cannot absorb water and ink quickly, so that after the bible paper is printed and stacked together with the ink, the stacked bible paper is adhered or stained because of slow drying of the ink, the printing effect is influenced, and meanwhile, the paper is still easy to show through after absorbing more ink amount.
Disclosure of Invention
The invention aims to overcome the defects that the existing biblical papers are slow in drying speed when absorbing large ink quantity, and are adhered or dyed faintly after being printed and stacked, and the printing effect is influenced, and provides a production method of quick-drying biblical papers, which can achieve the effects that the biblical papers can be dried quickly after absorbing ink and are not printed through two sides, and ensure the printing effect of the biblical papers.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method of quick-drying biblical paper is characterized by comprising the following steps:
(1) mixing the fiber raw material and titanium dioxide, pulping, adding sodium carboxymethylcellulose and water, mixing and stirring to obtain a fiber stock solution;
(2) forming the fiber stock solution on a net, dehydrating and drying to obtain ultrathin paper sheets;
(3) bonding the ultrathin paper sheets with each other by using an adhesive containing a silane-based polymer, and then standing until the ultrathin paper sheets completely react with the adhesive to obtain a plurality of composite paper sheets;
(4) performing double-sided sizing on the composite paper sheet by using a filler comprising 200-300 parts of branched polyhydroxy polymerization sizing agent, 30-50 parts of retention aid and 1-2 parts of lubricant, and standing at normal temperature until the filler is completely fixed on the composite paper sheet;
(5) and then dewatering, drying and calendaring to obtain the quick-drying bible paper.
According to the invention, the polyhydroxy polymerization sizing agent is adopted to carry out double-sided sizing on the paper sheet, and hydrogen bonds are formed between the polymerization sizing agent with a polyhydroxy structure and hydroxyl groups on cellulose on the surface of the paper sheet, so that the binding force between the sizing agent and the surface of the paper sheet is increased, and the binding firmness degree between the paper sheet and the sizing agent is increased; meanwhile, the longer polymer molecular chains in the polymerization sizing agent can link the celluloses at different positions on the surface of the paper together through the polymer molecular chains, so that some celluloses which are not connected originally are indirectly connected, and the strength of the paper is further enhanced. And polyhydroxy structure makes the polymerization sizing agent when guaranteeing paper intensity, the hydroxyl quantity on greatly increased page surface still, improve the water absorption performance of page, guarantee that the page can absorb the moisture in the ink fast and make it flow to the base paper layer of glueing layer below after the printing, and pigment composition in the ink is because different with the absorbed degree of water, still stay the sizing agent layer on paper surface after moisture flows to the base paper layer fast, pigment composition and moisture quick separation, with this effect that reaches the rapid-curing cutback, make the paper pile together also can not take place to glue or the condition of halation after the printing, guarantee the printing effect of paper.
The paper is easy to soften and become transparent, and is easy to break and penetrate through after absorbing a large amount of water quickly, so that a hydrophobic layer is arranged in the middle of the paper, namely a thin layer formed by an adhesive for bonding two paper sheets together, and the main component of the hydrophobic layer is a silane-based polymer. Silyl in the polymerization sizing agent can react with hydroxyl on cellulose on the surface of paper to silylate the hydroxyl on the surface of the cellulose, silyl in different directions can react with the cellulose on the paper at different sides, so as to firmly bond two pieces of paper together, and because the molecular chains of the polymer are longer, a small part of hydroxyl which is not modified by silylation can be covered by the polymerization sizing agent with longer molecular chains, the polymers with different molecular chains are mutually parallel or arranged in a staggered way and stacked on the surface of the cellulose to form a compact polymer thin film layer, ester groups with better hydrophobicity exist between the adhesives of the paper at different sides, and the ester groups are also closely arranged to form an ester hydrophobic layer, so that the hydrophobic property of the hydrophobic layer is further increased, and after the paper absorbs water rapidly, the water is blocked by the hydrophobic layer in the middle of the paper and cannot permeate to the other side of the paper, ensures that the paper can not print through after absorbing a large amount of water. Meanwhile, the hydrophobic layer in the middle of the paper also plays a role in adhesion, so that the strength of the paper is further increased, and the paper is prevented from breaking after absorbing water.
Preferably, the preparation method of the silane-based polymer in the adhesive is as follows:
(a) adding the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate into ethanol in a molar ratio of 1:10-15 under the protection of inert gas, and stirring and mixing to form a mixed solution, wherein the amount of the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate added per milliliter of ethanol is 0.05-0.2 g;
(b) reacting the mixed solution at 85-90 ℃ for 20-25 hours, and distilling under reduced pressure to remove ethanol to obtain the silane-based polymer.
The silyl polymer is prepared by taking saponified polyvinyl acetate and dimethoxy chlorosilyl propyl isocyanate as raw materials, the preparation is relatively simple, the obtained polymeric sizing agent has a three-stage main body structure and respectively contains dimethoxy chlorosilyl propyl isocyanate, ethyl acetate and hydroxyl, wherein the dimethoxy chlorosilyl propyl isocyanate can silylate the hydroxyl on the surface of cellulose, a hydrophobic film with good hydrophobicity is formed on the surface of the cellulose, a small part of hydroxyl on the surface of the cellulose, which is not silylated, can be mixed with the hydroxyl on the polymer, hydrogen bonds are formed between the hydroxyl and the polymer, the bonding firmness between the polymeric sizing agent and paper is further increased, and the auxiliary bonding effect is achieved; the ethyl acetate group forms a denser ester-based waterproofing membrane on the side away from the silane group, improving the waterproofing performance of the paper. The saponified polyvinyl acetate in the raw material for preparing the polymerization sizing agent is a polymer, the relative molecular weight of the polymer is high, and in order to meet the requirement that more dimethoxy chlorosilyl propyl isocyanate can be connected to the main chain of the saponified polyvinyl acetate, the polyvinyl acetate and the dimethoxy chlorosilyl propyl isocyanate are arranged in a molar ratio of 1:10-15, and under the molar ratio, the polyvinyl acetate and the dimethoxy chlorosilyl propyl isocyanate can be better reacted and combined, so that the raw material utilization rate of the polyvinyl acetate and the dimethoxy chlorosilyl propyl isocyanate is increased, and the water blocking performance of the inner hydrophobic layer of the paper is improved.
Preferably, the weight average molecular weight of the saponified polyvinyl acetate is 3000-5000, and the saponification degree of the saponified polyvinyl acetate is 40-60%. The saponified polyvinyl acetate under the weight-average molecular weight has a proper chain length, polymer molecular chains can be arranged on the surface of paper in a staggered manner or stacked to form a compact hydrophobic layer after reaction to form a polymeric adhesive, and paper cellulose which is not originally connected together forms an indirect connection relationship through the molecular chains of the polymeric adhesive, so that the strength of the paper is further increased while the hydrophobicity of the hydrophobic layer in the paper is ensured, and the situation that the paper is easy to tear or print after absorbing water is avoided; the amount ratio of dimethoxy chlorosilyl propyl isocyanate group, ethyl acetate group and hydroxyl group in the polymerization sizing agent formed by polymerizing the saponified polyvinyl acetate with saponification degree of 40-60% and dimethoxy chlorosilyl propyl isocyanate is 20-40:30-50:30-50, and the bonding strength of the polymerization adhesive and paper can be further increased under the condition of ensuring the hydrophobicity of the hydrophobic layer under the amount ratio of the groups.
Preferably, the branched polyhydroxy polymerization sizing agent is prepared by the following method:
(i) under the protection of inert gas, adding methyl acrylate into a methanol solution of diethanolamine, and reacting for 3-5h at 35-40 ℃ to obtain a mixed solution;
(ii) adding 1-3% of p-toluenesulfonamide into the mixed solution, adding trimethylolpropane into the mixed solution, distilling under reduced pressure to remove methanol, heating to 110-120 ℃, and reacting for 3-6h to obtain the branched polyhydroxy polymerization sizing agent.
The branched polyhydroxy polymerization sizing agent used in the invention is a branched polymer which takes methyl acrylate as a skeleton and contains polyhydroxy, a large number of hydroxyls on the branched polymer can greatly improve the water absorption performance of the surface of paper, can ensure that the paper can quickly absorb the moisture in the ink after the ink is sprayed, and can retain the pigment component in the ink with weak permeability on the surface of the paper according to the difference of the permeability, thereby achieving the effect of quickly separating the moisture from the pigment component and realizing the effect of quick drying. A large number of hydrogen bonds can be formed between a large number of hydroxyl groups and hydroxyl groups on cellulose on the surface of paper, so that the adhesion and fixation of the polymerization sizing agent on the surface of the paper are further ensured; the branched polyhydroxy polymerization sizing agent molecular chain with longer length and larger coverage area can also indirectly connect the cellulose which is originally arranged in parallel or far away and has no direct connection relationship, thereby increasing the connection relationship between the cellulose, ensuring the quick drying of the paper and further increasing the strength of the paper.
Preferably, the branched polyhydroxy polymerization sizing agent has a molar ratio of methyl acrylate to diethanolamine of 1:1-3, and the methyl acrylate and trimethylolpropane are added dropwise. The synthesis method of the branched polyhydroxy polymerization sizing agent comprises the step of synthesis, firstly, a carbon-carbon double bond on methyl acrylate and an amino group on diethanol amine are subjected to Michael addition reaction to generate a prepolymer, the influence of the feeding ratio in the step of reaction on the synthesis yield of monomers in the reaction is small, but in order to shorten the reaction time and improve the reaction yield as much as possible, the diethanol amine is arranged to be excessive in the methyl acrylate, after the reaction, the excessive diethanol amine has lower boiling point and better volatility, so that the excessive diethanol amine is easily removed in the process of removing the methanol by reduced pressure distillation in the second step, and then the methanol and the diethanol amine are further separated and recovered; and because the two reactions are violent in heat release and the thermal polymerization reaction of the diethanol amine can be caused by overhigh temperature, the dropping mode is adopted, and the phenomenon that more side reactions are caused by overhigh reaction temperature is avoided.
Preferably, the fiber raw material in the step (1) comprises bleached softwood pulp and bleached hardwood pulp in a weight ratio of 3-5:1, the addition amount of titanium dioxide is 1.5-3 wt%, the pulp grinding degree is 80-90 DEG SR, the centrifugal dryness is 25-35g, the wet weight is 2-5g, and the pH value is 7.5-8.5; and/or mixing the mixed slurry, the sodium carboxymethyl cellulose and the water in the step (2) according to the weight ratio of 1:2-5: 50-100. The fiber raw material of the invention is prepared by matching softwood pulp with a majority of long fibers with hardwood pulp with a minority of short fibers, so that the wood pulp of the long fibers in the finally obtained pulp accounts for more than two thirds of the total fiber amount, a structure taking the long fibers as a basic skeleton is formed, the short fibers are filled in the long fiber skeleton, the long fibers and the short fibers are staggered and crossed to form more hydrogen bond connection relations among hydroxyl groups on cellulose in the wood pulp, and the connection among different long fibers is tighter, so that the finally prepared paper has higher basic strength through the coordination and cooperation of the long fibers and the short fibers.
Preferably, the retention aid in the step (4) is one or two of cationic starch and polyvinyl alcohol; and/or the lubricant is calcium stearate.
Preferably, the amount of the silane-based polymer used in the step (3) is 5 to 10 wt%; and/or the amount of branched polyhydroxy polymerization size used in step (4) is 3 to 6 wt%. The use amount of the silane-based polymer is large, so that the hydrophobicity of the bonding layer in the paper can be ensured, and the phenomenon of strike-through after the paper absorbs water can be prevented.
Preferably, in the step (3): the adhesive also comprises one or two of cationic styrene-butadiene latex and polyvinyl acetate latex. The polyvinyl acetate latex and the styrene-butadiene latex are retention aids with good hydrophobicity, and the retention aids can better play the hydrophobic effect of the adhesive layer when added into the adhesive, and can improve the fixing firmness of the adhesive and paper and increase the strength of the paper.
Preferably, the water content of the product obtained in the step (3) after pre-dehydration and drying is 12-15%; and/or the water content after dehydration and drying in the step (5) is 1-4%.
In conclusion, the invention has the following beneficial effects: (1) the polyhydroxy polymerization sizing agent is used for double-sided sizing of paper sheets, so that the number of hydroxyl groups on the surface of the paper sheets is greatly increased, the water absorption capacity of the paper sheets is improved, the rapid separation of water and pigment components in the ink is realized after the paper sheets absorb ink, and the effect of quick drying is achieved; (2) hydrogen bonds are formed between the polymerization sizing agent with the polyhydroxy structure and hydroxyl groups on cellulose on the surface of the paper, so that the binding force between the sizing agent and the surface of the paper is increased, the bonding firmness degree between the paper and the sizing agent is increased, and the strength of the paper is improved; (3) the hydrophobic layer is added in the middle of the paper, so that the paper is ensured not to have strike-through after absorbing water, and the strength of the paper is improved.
Detailed Description
The invention is further described with reference to specific embodiments.
Example 1
A production method of quick-drying bible paper comprises the following steps:
(1) adding a mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate into ethanol in a molar ratio of 1:15 under the protection of nitrogen, and stirring and mixing to form a mixed solution, wherein the amount of the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate added per milliliter of ethanol is 0.2g, the saponification degree of saponified polyvinyl acetate is 40%, and the weight-average molecular weight is 5000; then reacting the obtained mixed solution at 85 ℃ for 20 hours, and distilling under reduced pressure to remove ethanol to obtain a silane-based polymer;
(2) under the protection of nitrogen, dropwise adding methyl acrylate into a methanol solution of diethanolamine, wherein the molar ratio of methyl acrylate to diethanolamine is 1:1, and reacting at 40 ℃ for 3h to obtain a mixed solution; then adding 1% of p-toluenesulfonamide into the mixed solution, dropwise adding trimethylolpropane into the mixed solution, carrying out reduced pressure distillation to remove methanol, heating to 115 ℃, and reacting for 6 hours to obtain a branched polyhydroxy polymerization sizing agent;
(3) mixing bleached softwood pulp and bleached hardwood pulp according to a weight ratio of 5:1, adding 2% titanium dioxide, pulping until the pulp grinding degree is 80 DEG SR, the centrifugal dryness is 35g, the wet weight is 4g, and the pH is 8 to obtain mixed pulp;
(4) mixing and stirring the mixed pulp, sodium carboxymethylcellulose and water according to the weight ratio of 1:5:100 to obtain a fiber stock solution, then carrying out net-feeding forming, and dehydrating and drying until the water content is 15% to obtain ultrathin paper sheets;
(5) bonding the ultrathin paper sheets with 5wt% of adhesive containing silane-based polymer and cationic styrene-butadiene latex, standing until the ultrathin paper sheets completely react with the adhesive to obtain a plurality of composite paper sheets
(6) Carrying out double-sided sizing on a filler comprising 200 parts of branched polyhydroxy polymerization sizing agent, 50 parts of polyvinyl acetate latex and 2 parts of sodium stearate for a composite paper sheet, and standing at normal temperature until the filler is completely fixed on the paper sheet, wherein the addition amount of the branched polyhydroxy polymerization sizing agent is 6 wt%;
(7) and then dewatering and drying until the water content is 3 percent, and performing calendaring to obtain the quick-drying bible paper.
Example 2
(1) Adding a mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate into ethanol in a molar ratio of 1:10 under the protection of nitrogen, and stirring and mixing to form a mixed solution, wherein the amount of the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate added per milliliter of ethanol is 0.05g, the saponification degree of saponified polyvinyl acetate is 60%, and the weight-average molecular weight is 5000; then reacting the obtained mixed solution at 90 ℃ for 20 hours, and distilling under reduced pressure to remove ethanol to obtain a silane-based polymer;
(2) under the protection of nitrogen, dropwise adding methyl acrylate into a methanol solution of diethanolamine, wherein the molar ratio of methyl acrylate to diethanolamine is 1:3, and reacting at 35 ℃ for 4h to obtain a mixed solution; then adding 3% of p-toluenesulfonamide into the mixed solution, dropwise adding trimethylolpropane into the mixed solution, carrying out reduced pressure distillation to remove methanol, heating to 120 ℃, and reacting for 4 hours to obtain a branched polyhydroxy polymerization sizing agent;
(3) mixing bleached softwood pulp and bleached hardwood pulp according to a weight ratio of 3:1, adding 1.5% titanium dioxide, pulping until the pulp grinding degree is 90 DEG SR, the centrifugal dryness is 30g, the wet weight is 2g, and the pH is 7.5 to obtain mixed pulp;
(4) mixing and stirring the mixed pulp, sodium carboxymethylcellulose and water according to the weight ratio of 1:2:100 to obtain a fiber stock solution, then carrying out net-feeding forming, and dehydrating and drying until the water content is 12% to obtain ultrathin paper sheets;
(5) bonding the ultrathin paper sheets with 10wt% of adhesive containing silane-based polymer and cationic styrene-butadiene latex, and standing until the ultrathin paper sheets completely react with the adhesive to obtain a plurality of composite paper sheets
(6) Performing double-sided sizing on a filler of 300 parts of branched polyhydroxy polymerization sizing agent, 30 parts of cationic styrene-butadiene latex and 1 part of sodium stearate for a composite paper sheet, and standing at normal temperature until the filler is completely fixed on the paper sheet, wherein the addition amount of the branched polyhydroxy polymerization sizing agent is 3 wt%;
(7) and then dewatering and drying until the water content is 4 percent, and obtaining the quick-drying bible paper after calendaring.
Example 3
(1) Adding a mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate into ethanol in a molar ratio of 1:13 under the protection of nitrogen, and stirring and mixing to form a mixed solution, wherein the amount of the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate added per milliliter of ethanol is 0.1g, the saponification degree of saponified polyvinyl acetate is 50%, and the weight-average molecular weight is 3000; then reacting the obtained mixed solution at 88 ℃ for 25 hours, and distilling under reduced pressure to remove ethanol to obtain a silane-based polymer;
(2) under the protection of nitrogen, dropwise adding methyl acrylate into a methanol solution of diethanolamine, wherein the molar ratio of methyl acrylate to diethanolamine is 1:3, and reacting at 38 ℃ for 5 hours to obtain a mixed solution; then adding 2% of p-toluenesulfonamide into the mixed solution, dropwise adding trimethylolpropane into the mixed solution, carrying out reduced pressure distillation to remove methanol, heating to 110 ℃, and reacting for 3 hours to obtain a branched polyhydroxy polymerization sizing agent;
(3) mixing bleached softwood pulp and bleached hardwood pulp according to a weight ratio of 4:1, adding 3% titanium dioxide, pulping until the pulp grinding degree is 85 DEG SR, the centrifugal dryness is 25g, the wet weight is 5g, and the pH is 8.5 to obtain mixed pulp;
(4) mixing and stirring the mixed pulp, sodium carboxymethylcellulose and water according to the weight ratio of 1:4:50 to obtain a fiber stock solution, then carrying out net-feeding forming, and dehydrating and drying until the water content is 13% to obtain ultrathin paper sheets;
(5) bonding the ultrathin paper sheets with a 7wt% adhesive containing a silane-based polymer and cationic styrene-butadiene latex, standing until the ultrathin paper sheets completely react with the adhesive to obtain a plurality of composite paper sheets
(6) Performing double-sided sizing on a filler comprising 250 parts of branched polyhydroxy polymerization sizing agent, 40 parts of polyvinyl acetate latex and 1.5 parts of sodium stearate on a composite paper sheet, and standing at normal temperature until the filler is completely fixed on the paper sheet, wherein the addition amount of the branched polyhydroxy polymerization sizing agent is 5 wt%;
(7) and then dewatering and drying until the water content is 1 percent, and obtaining the quick-drying bible paper after calendaring.
Example 4
(1) Adding a mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate into ethanol in a molar ratio of 1:12 under the protection of nitrogen, and stirring and mixing to form a mixed solution, wherein the amount of the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate added per milliliter of ethanol is 0.1g, the saponification degree of saponified polyvinyl acetate is 60%, and the weight-average molecular weight is 4000; then reacting the obtained mixed solution at 88 ℃ for 23 hours, and distilling under reduced pressure to remove ethanol to obtain a silane-based polymer;
(2) under the protection of nitrogen, dropwise adding methyl acrylate into a methanol solution of diethanolamine, wherein the molar ratio of methyl acrylate to diethanolamine is 1:2, and reacting at 40 ℃ for 4h to obtain a mixed solution; then adding 2% of p-toluenesulfonamide into the mixed solution, dropwise adding trimethylolpropane into the mixed solution, carrying out reduced pressure distillation to remove methanol, heating to 115 ℃, and reacting for 4 hours to obtain a branched polyhydroxy polymerization sizing agent;
(3) mixing bleached softwood pulp and bleached hardwood pulp according to a weight ratio of 3:1, adding 2% titanium dioxide, pulping until the pulp grinding degree is 85 DEG SR, the centrifugal dryness is 30g, the wet weight is 4g, and the pH is 8 to obtain mixed pulp;
(4) mixing and stirring the mixed pulp, sodium carboxymethylcellulose and water according to the weight ratio of 1:4:75 to obtain a fiber stock solution, then carrying out net-feeding forming, and dehydrating and drying until the water content is 14% to obtain ultrathin paper sheets;
(5) bonding the ultrathin paper sheets with 8wt% of adhesive containing silane-based polymer and cationic styrene-butadiene latex, and standing until the ultrathin paper sheets completely react with the adhesive to obtain a plurality of composite paper sheets
(6) Performing double-sided sizing on a filler comprising 250 parts of branched polyhydroxy polymerization sizing agent, 50 parts of polyvinyl acetate latex and 1.5 parts of sodium stearate on a composite paper sheet, and standing at normal temperature until the filler is completely fixed on the paper sheet, wherein the addition amount of the branched polyhydroxy polymerization sizing agent is 4 wt%;
(7) and then dewatering and drying until the water content is 2 percent, and calendering to obtain the quick-drying bible paper.
Comparative example 1
Comparative example 1 differs from example 3 in that comparative example 1 contains no silane-based polymer in the adhesive added in step (5), and the remaining conditions are the same as in example 4.
Comparative example 2
Comparative example 2 differs from example 4 in that comparative example 2 added the sizing agent in step (4) as AKD sizing agent, and the remaining conditions were the same as in example 4.
Comparative example 3
Comparative example 3 differs from example 4 in that comparative example 3 does not contain a silicone-based polymer as the binder added in step (5), and the sizing agent added in step (4) is an AKD sizing agent, all other conditions being the same as in example 4.
The performance parameters of the bible papers obtained in the different examples and comparative examples are shown in the following table:
| numbering | Quantitative (g/m)2） | Longitudinal tensile index (KN/m) | Transverse tensile index (KN/m) | Water absorption Cobb (g/m) on paper surface2） | Print-through condition of paper after water absorption |
| Example 1 | 33 | 2.5 | 1.7 | 20.1 | Whether or not |
| Example 2 | 31 | 2.3 | 1.7 | 19.5 | Whether or not |
| Example 3 | 32 | 2.7 | 1.9 | 21.3 | Whether or not |
| Example 4 | 30 | 2.8 | 1.9 | 21.8 | Whether or not |
| Comparative example 1 | 29 | 1.8 | 1.1 | 20.2 | Is that |
| Comparative example 2 | 30 | 2.2 | 1.6 | 10.5 | Whether or not |
| Comparative example 3 | 29 | 1.5 | 0.9 | 11.0 | Is that |
As can be seen from the table, the biblical papers prepared by the preparation method and the materials of the invention in examples 1 to 4 have good tensile index, surface water absorption and strike-through condition, and are suitable for being used as quick-drying biblical papers; the adhesive layer of the middle of the bible paper prepared in the comparative example 1 does not contain a silicone-based polymer, and the bible paper prepared in the examples 1 to 4 has a large difference in paper strength and is easy to show after absorbing water; the sizing agent on the surface of the bible paper prepared in the comparative example 2 is changed from a polymerization sizing agent to an AKD sizing agent, and the sizing agent is poor in water absorption performance on the surface of the paper; while the bible paper prepared in comparative example 3 does not contain a silicone-based polymer in the middle bonding layer, and the sizing agent on the surface is changed to an AKD sizing agent from a polymerization sizing agent, compared with the bible papers prepared in examples 1 to 4, the bibulous paper prepared in comparative example 3 has greatly reduced paper strength and water absorption, and is easy to show strike-through after absorbing water.
Claims (8)
1. A production method of quick-drying biblical paper is characterized by comprising the following steps:
(1) mixing the fiber raw material and titanium dioxide, pulping, adding sodium carboxymethylcellulose and water, mixing and stirring to obtain a fiber stock solution;
(2) forming the fiber stock solution on a net, dehydrating and drying to obtain ultrathin paper sheets;
(3) bonding the ultrathin paper sheets with each other by using an adhesive containing a silane-based polymer, and then standing until the ultrathin paper sheets completely react with the adhesive to obtain a plurality of composite paper sheets;
(4) performing double-sided sizing on the composite paper sheet by using a filler comprising 200-300 parts of branched polyhydroxy polymerization sizing agent, 30-50 parts of retention aid and 1-2 parts of lubricant, and standing at normal temperature until the filler is completely fixed on the composite paper sheet;
(5) then dewatering, drying and press polishing are carried out to obtain the quick-drying bible paper;
the preparation method of the silane-based polymer in the adhesive is as follows:
(a) adding the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate into ethanol in a molar ratio of 1:10-15 under the protection of inert gas, and stirring and mixing to form a mixed solution, wherein the amount of the mixture of saponified polyvinyl acetate and dimethoxy chlorosilylpropyl isocyanate added per milliliter of ethanol is 0.05-0.2 g;
(b) reacting the mixed solution at 85-90 ℃ for 20-25 hours, and distilling under reduced pressure to remove ethanol to obtain a silane-based polymer;
the preparation method of the branched polyhydroxy polymerization sizing agent comprises the following steps:
(i) under the protection of inert gas, adding methyl acrylate into a methanol solution of diethanolamine, and reacting for 3-5h at 35-40 ℃ to obtain a mixed solution;
(ii) adding 1-3% of p-toluenesulfonamide into the mixed solution, adding trimethylolpropane into the mixed solution, distilling under reduced pressure to remove methanol, heating to 110-120 ℃, and reacting for 3-6h to obtain the branched polyhydroxy polymerization sizing agent.
2. The method for producing quick-drying bible paper as claimed in claim 1, wherein the weight average molecular weight of the saponified poly (vinyl acetate) is 3000-5000, and the saponification degree of the saponified poly (vinyl acetate) is 40-60%.
3. The method of claim 1 wherein the branched polyhydroxy polymerization size has a molar ratio of methyl acrylate to diethanolamine of 1:2 to 3, and wherein the methyl acrylate and trimethylolpropane are added dropwise.
4. The method for producing quick-drying type bible paper according to claim 1, wherein the fiber raw materials in the step (1) comprise bleached softwood pulp and bleached hardwood pulp, the weight ratio is 3-5:1, the adding amount of titanium dioxide is 1.5-3 wt%, the pulp refining degree is 80-90 ° SR, the centrifugal dryness is 25-35g, the wet weight is 2-5g, and the pH is 7.5-8.5; and/or
And (3) mixing the mixed slurry, sodium carboxymethylcellulose and water in a weight ratio of 1:2-5:50-100 in the step (2).
5. The method for producing quick-drying bible paper as claimed in claim 1, wherein the retention aid in step (4) is one or both of cationic starch and polyvinyl alcohol; and/or
The lubricant is calcium stearate.
6. A method for producing a quick-drying bible paper according to any one of claims 1 to 3, wherein the amount of the silane-based polymer used in the step (3) is 5 to 10 wt%; and/or
The branched polyhydroxy polymerization sizing agent in step (4) is used in an amount of 3 to 6 wt%.
7. The method for producing quick-drying bible paper as claimed in claim 1, wherein in the step (3): the adhesive also comprises one or two of cationic styrene-butadiene latex and polyvinyl acetate latex.
8. The method for producing quick-drying bible paper as claimed in claim 1, wherein the moisture content of the bible paper after the pre-dehydration and drying in the step (3) is 12-15%; and/or
In the step (5), the water content is 1-4% after dehydration and drying.
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| JP2005188001A (en) * | 2003-12-26 | 2005-07-14 | Nicca Chemical Co Ltd | Method for producing coated paper |
| ES2381999T3 (en) * | 2006-06-27 | 2012-06-04 | Basf Se | Method for sizing paper and paper products |
| CN101553508B (en) * | 2006-09-07 | 2012-12-26 | 西巴控股有限公司 | Glyoxalation of vinylamide polymer |
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