CN111676732B - Preparation method of low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration - Google Patents

Preparation method of low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration Download PDF

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CN111676732B
CN111676732B CN202010442907.9A CN202010442907A CN111676732B CN 111676732 B CN111676732 B CN 111676732B CN 202010442907 A CN202010442907 A CN 202010442907A CN 111676732 B CN111676732 B CN 111676732B
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paper
pulp
beating
preparation
slurry
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CN111676732A (en
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王敏岚
戴贤中
王显哲
贺远建
骆华英
刘强利
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Xianhe Co ltd
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Xianhe Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • 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
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/303—Double disc mills
    • 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
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • 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
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to the technical field of papermaking, and provides a preparation method of low-quantitative transfer printing base paper with stable seepage prevention and heat penetration aiming at the problems of poor universality and resource waste of transfer base paper. The method comprises the following steps: (1) mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; (2) soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; (3) surface sizing is carried out on the raw paper by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; (4) and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The printing base paper has the advantages of low basis weight, good paper toughness, strong thermal stability, capability of preventing ink penetration, good tensile strength and good paper evenness, and can be used for sizing by introducing low-volume polymer macromolecules with good film-forming property, and the strength of low-basis-weight paper is enhanced by combining and changing a pulping process.

Description

Preparation method of low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation method of low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration.
Background
Transfer printing is the printing of various patterns on a particular sheet of paper using a particular thermal transfer ink, and then the pattern is transferred to the product by temperature and pressure. This particular paper in the thermal transfer process is called transfer printing paper. Transfer printing refers to a printing process in which dyes are transferred to a fabric through transfer paper. According to sublimation characteristics of some disperse dyes, the disperse dyes which are sublimated at 150-230 ℃ are selected and mixed with sizing agent to prepare color ink, the color ink is printed on transfer paper (the transfer paper is specially-made paper and is called transfer paper) according to different design requirements, then the transfer paper printed with pattern patterns is closely contacted with a fabric, and the transfer paper enters the fabric through diffusion under the condition of controlling certain temperature, pressure and time, so that the purpose of coloring is achieved. Under the condition of ensuring the coloring quality of the pattern transfer printing mark, the low-quantitative paper is the development trend of the paper making industry at present, the paper making raw materials can be saved, and the paper making cost is reduced. However, when the basis weight of the transfer base paper is reduced, the transfer base paper is easily shrunk by heat or easily penetrated by ink, so that the improvement of the thermal stability and the permeability resistance of the transfer base paper in low-weight transfer paper is of great significance.
The invention provides a raw paper of thermal transfer paper, which is provided with the patent number CN201410277143.7 and the patent name 'raw paper of thermal transfer paper and a preparation process thereof', and the basis weight of the raw paper of the thermal transfer paper is 70-95 g/m2The quantitative difference of the horizontal breadth is less than or equal to 5g/m2The tightness is 0.8 to 0.85g/cm3The smoothness is 45/36S, the transverse tearing degree is more than or equal to 600mN, the longitudinal dry tensile strength is more than or equal to 70N/15mm, the longitudinal wet tensile strength is more than or equal to 12N/15mm, the air permeability is more than or equal to 60S, and the water absorption value is 30-50 g/m2The deformation rate is less than or equal to 1.5 percent, and the dust is less than or equal to 10 pieces/m2(ii) a The manufacturing process of the thermal transfer paper base paper comprises pulping, mixing, pulping, rewinding to obtain the thermal transfer paper base paper, and then packaging, wherein a surface sizing solution and a filler are added during pulping.
The method has the disadvantages that the base paper has high quantification, and when light-color patterns or common patterns are transferred, the base paper with high quantification is not needed, so that the resource waste is caused.
Disclosure of Invention
The invention aims to overcome the problems of poor universality and resource waste of transfer base paper, and provides a preparation method of low-basis-weight transfer printing base paper with seepage prevention, heat penetration stability and low basis weight.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry;
(2) sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment;
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product.
The invention aims to prepare a preparation method of low-quantitative transfer printing base paper with stable seepage prevention and heat penetration, on the premise of reducing the quantification of the transfer base paper, on one hand, the mechanical property and the purity of the low-quantitative transfer base paper are improved by adjusting the type, the processing technology and the proportion of raw material slurry, and on the other hand, the transfer efficiency of the low-quantitative transfer base paper is ensured by improving the glue layer quality of a sizing layer. For the quality of a glue layer, the absorption capacity of the thermal transfer paper to ink needs to be reduced, the problem of high ink absorption capacity is solved by adopting an ink transfer film prepared by internal sizing, the surface strength, the ink absorption and the transfer performance of the surface of base paper are improved obviously, the problem of hair and powder falling in the coating process is also solved, the coating process is smoother, and finally a good ink carrier is obtained on the surface of the base paper. The ink needs higher temperature to be printed on a target object in the transfer printing process, so that the thermal transfer paper is required to have stronger thermal stability, when the temperature is increased, the thermal transfer paper cannot shrink or deform due to heating, and the internal components of the thermal transfer paper cannot be decomposed by heating.
Preferably, the stock slurry comprises 20-40% long fiber bleached softwood pulp and 60-80% short fiber bleached broad leaf pulp.
Preferably, the preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 160-180kwh, the beating concentration to be 3.7-4.0% and the beating degree to be 25-28 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a beating front pool, and then transferred into a short-staple beating back pool through a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 150-170kwh, the beating concentration to be 3.7-4.0% and the beating degree to be 28-30 DEG SR.
The method changes the original mixed pulp grinding into the mixed pulp grinding of needle-leaf and broad-leaf semi-finished pulp by changing the pulp grinding process, and then mixes the mixed pulp grinding with the auxiliary agent for further pulping, thereby increasing the fiber combination area and avoiding the fiber cutting effect as much as possible; the generation of fine broken fibers is reduced, and the strength of the low-basis weight paper sheet is enhanced; in addition, the continuity of the low-basis-weight base paper is ensured by the matching of the long and short fibers in a definite proportion. The original full-natural color paste production is changed into the bleaching paste, because the high cleanliness performance of the bleaching paste reduces impurities in finished paper leaves, the phenomenon of printing transfer printing white leakage caused by exposure of hard impurities in low-quantitative paper leaves is avoided, the printing transfer effect of the low-quantitative transfer printing base paper with stable seepage prevention and heat penetration is ensured, and the requirement of high-quality patterns is met.
Preferably, the auxiliary agents and the using amounts thereof are respectively as follows: the dosage of the degasifier is 0.5-0.8kg per ton of paper; the dosage of the defoaming agent is 0.3-0.6kg per ton of paper.
Preferably, the volume ratio of the white dextrin solution to the mixed slurry in the step (2) is 1-1.2: 1.
the white dextrin is a preferred thickening agent and has a wide viscosity range, wherein after the white dextrin is mixed with the pulp, the viscosity of the pulp can be increased, and the white dextrin can be effectively attached to the surface of fibers after penetrating into wood fibers in the pulp, so that the adhesive force and the active group attachment points between the fibers are increased, and a strong adhesion foundation is provided for further crosslinking combination of a wood fiber matrix and a subsequent sizing coating layer.
Preferably, in the step (3), the modified cetyl methacrylate-N-methylolacrylamide-styrene polymer is prepared by the steps of:
A. preparing a seed emulsion: adding distilled water, cetyl methacrylate and N-hydroxymethyl acrylamide into a container under magnetic stirring, adding tetrabutyl titanate serving as a catalyst and cetyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature to be 65-75 ℃, and reacting for 0.8-1.2h to obtain cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 95-105 ℃, reacting for 1.5-2h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 65-70 ℃, and stirring for 1-1.5h to obtain the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer.
Preferably, the ratio of distilled water, cetyl methacrylate, N-methylolacrylamide, tetrabutyltitanate and cetyltrimethylammonium bromide in step A: 200-250 ml: 1-1.5 mol: 1.5-1.8 mol: 20-22 g: 80-100 ml.
Preferably, the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed solution in the step B is 3.5-4: 1; in the step C, the molar ratio of the 2, 2-dimethylolpropionic acid to the polymer is 1-1.2: 1-1.4.
The macromolecular polymer prepared by the step has stronger ink adhesion capability and good ink adhesion capability.
Cetyl methacrylate is introduced here because the ester group itself has a certain oleophilic ability, which is beneficial for the ink to adhere on the transfer paper, and the original appearance of the printed pattern is maintained, but the situation that the ink flows everywhere due to the poor adhesion ability on the transfer paper does not occur, but if the carbon chain on the main chain of the monomer is too long and the number of carbon atoms exceeds 16, the effective network volume inside the molecular chain is reduced, and the adsorbed oil amount cannot be stored inside, so that the ink adsorption ability is reduced. Therefore, the cetyl methacrylate is selected, so that the adhesion of the ink can be ensured, the excessive ink adsorption of the transfer base paper can be avoided, and the higher transfer efficiency of the ink is ensured. The N-hydroxymethyl acrylamide is introduced, the molecular structure of the N-hydroxymethyl acrylamide contains an amido group, and unshared electrons on amino nitrogen in the amido group form a conjugated system with stronger resistance effect with pi electrons of carbonyl, so that the N-hydroxymethyl acrylamide has a positive promotion effect on the improvement of the thermal stability of a macromolecular chain. Then introducing styrene, and introducing a rigid group benzene ring after introducing a large conjugated structure into the final macromolecular polymer structure, so that the macromolecule has the double functions of promoting the thermal stability of the polymer and filling the macromolecular network structure, and the macromolecular chain of the polymer has stronger thermal stability and film-forming continuity.
The printing ink contains a large amount of printing ink dissolving solvent besides printing ink components, if transfer printing base paper on the solvent only contains oleophilic groups, the oleophilic groups have poor polarity, so that the affinity to the solvent is poor, the separation of printing ink solute and polar solvent in the printing ink is bound to be caused, and the permeation and the attachment of the printing ink on a printed object after transfer printing are not facilitated.
The preparation method adopts seed polymerization, namely, adopts emulsion polymerization to synthesize the hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer, so that the regularity of a macromolecular chain is better, and the average molecular weight of the prepared polymer has smaller difference and is basically a homopolymer. The film forming mechanism is that the total polymer of the seed emulsion is dispersed in water phase in a particle state, each particle is composed of a plurality of polymer molecules, and the particles are compatible with each other to form the film by the polymer, so the emulsion film forming process is closely related to the hardness and softness of the particles, and the softer the particles, the easier the film forming is. The emulsion particles prepared by the seed method have good film-forming property because the outer layer is soft cetyl methacrylate-N-hydroxymethyl acrylamide, and the cetyl methacrylate-N-hydroxymethyl acrylamide-styrene prepared by the one-step blending method and the step-by-step blending method is easy to polymerize into a random copolymer, and the styrene units on the main chain of the random copolymer can increase the tensile strength of an adhesive film, reduce the elongation at break, increase the brittleness temperature and increase the hardness. The emulsion particle prepared by the seed method has the advantages that the cetyl methacrylate-N-hydroxymethyl acrylamide on the outer layer is in a continuous phase, the molecular branch chain is longer, and the bonding capability is extremely strong, so that the tensile strength, the brittleness temperature and the hardness are low, and the elongation at break is increased.
Preferably, the sizing method in the step (3) is performed by alternately performing a blade coating method and an air knife coating method, and the coating speed is 1-1.5 m/min.
When the adhesive layer is coated, a composite technology of two modes of scraper coating and air knife coating is adopted, so that the loss of the coating and the problem of hair and powder falling can be effectively improved, more importantly, the leveling property and film forming property of the coating are greatly improved in the coating process, and a foundation is laid for finally obtaining good ink transfer; the coated paper has smooth and fine surface, reduces the migration of the printing ink to the inside of the coating, and simultaneously, the printed pattern is clear and bright, so that a good transfer effect is obtained. The uniform coating speed matched with the composite technology can further ensure the coating quality of the glue layer, and the glue layer with uniform coating and thinner thickness can be prepared, which is beneficial to the low quantification of the transfer printing base paper.
Preferably, the stage drying conditions in step (4) are: slowly heating to 60-70 deg.C, drying for 1.2-1.5h, heating to 100 deg.C, and drying at 110 deg.C for 40-60 min.
Therefore, the invention has the following beneficial effects:
(1) the preparation method of the low-basis-weight transfer printing base paper with the advantages of seepage prevention, heat penetration stabilization and low basis weight transfer printing changes a pulping process, changes the original direct mixed pulping of fibers into mixed pulping of coniferous and broadleaf semi-finished pulps, increases the fiber combination area, avoids the cutting effect of the fibers as much as possible, reduces the generation of fine broken fibers, and enhances the strength of low-basis-weight paper sheets;
(2) by optimizing the base paper process and the coating process of the low-quantitative thermal transfer base paper, the low-quantitative thermal transfer base paper with good high transfer performance is developed, the deep color transfer effect of customers can be met, the density is high, the water resistance is good, and the low thermal shrinkage rate is low;
(3) the macromolecule with good film-forming property is prepared by emulsification polymerization, the loss of the coating and the solved hair and powder falling are reduced, the key is that the leveling property and the film-forming property in the coating process of the coating are greatly improved, and a foundation is laid for obtaining good ink transfer;
(4) the surface coating provides better attachment sites for the ink by modifying the adhesive layer polymer, and has lower absorptivity for the ink, so that the obtained macromolecular polymer film has excellent amphipathy.
Detailed Description
The invention is further described with reference to specific embodiments.
In the present invention, the raw materials and equipment used are commercially available or commonly used in the art, unless otherwise specified. The methods in the following examples are conventional in the art unless otherwise specified.
General examples
A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 20-40% of long fiber bleached softwood pulp and 60-80% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.5-0.8kg per ton of paper; the dosage of the defoaming agent is 0.3-0.6kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 160-180kwh, the beating concentration to be 3.7-4.0% and the beating degree to be 25-28 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a beating front pool, and then transferred into a short-staple beating back pool through a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 150-170kwh, the beating concentration to be 3.7-4.0% and the beating degree to be 28-30 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1-1.2: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1-1.5 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 250ml of 200-250ml of distilled water, 1-1.5mol of cetyl methacrylate and 1.5-1.8mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 20-22g of tetrabutyl titanate catalyst and 80-100ml of hexadecyl trimethyl ammonium bromide emulsifier after complete dissolution, controlling the temperature at 65-75 ℃, and reacting for 0.8-1.2h to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 95-105 ℃, reacting for 1.5-2h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the mol ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.5-4: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 65-70 ℃, and stirring for 1-1.5h to obtain a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer is 1-1.2: 1-1.4.
(4) Sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 60-70 deg.C, drying for 1.2-1.5h, heating to 100 deg.C, and drying at 110 deg.C for 40-60 min.
Each of the following embodiments is merely an example, and the specific number of the embodiments may be adjusted according to the specific scale.
Example 1
A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 30% of long fiber bleached softwood pulp and 70% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.9% and the beating degree to be 26 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.9% and the beating degree to be 29 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.1: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.3 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 230ml of distilled water, 1.3mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 21g of tetrabutyl titanate serving as a catalyst and 90ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.8: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.1: 1.2.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Example 2
The difference from the embodiment 1 is that the preparation method of the low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp contains 25% of long fiber bleached softwood pulp and 75% of short fiber bleached broad-leaved pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.8% and the beating degree to be 26 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.8% and the beating degree to be 29 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.05: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.1 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 210ml of distilled water, 1.1mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 20g of tetrabutyl titanate serving as a catalyst and 85ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.6: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.05: 1.3.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Example 3
The difference from the embodiment 1 is that the preparation method of the low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 20% of long fiber bleached softwood pulp and 80% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.7% and the beating degree to be 28 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.7% and the beating degree to be 28 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.05: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.1 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 210ml of distilled water, 1.1mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 20g of tetrabutyl titanate serving as a catalyst and 80ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.5: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.2: 1.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Example 4
The difference from the embodiment 1 is that the preparation method of the low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp contains 40% of long fiber bleached softwood pulp and 60% of short fiber bleached broad-leaved pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.9% and the beating degree to be 25 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.9% and the beating degree to be 28 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.2: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.4 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 240ml of distilled water, 1.1mol of cetyl methacrylate and 1.7mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 20g of tetrabutyl titanate serving as a catalyst and 95ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.9: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.15: 1.35.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Example 5
The difference from the embodiment 1 is that the preparation method of the low-basis-weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp contains 40% of long fiber bleached softwood pulp and 60% of short fiber bleached broad-leaved pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 4.0% and the beating degree to be 25 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 4.0% and the beating degree to be 28 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.2: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.5 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 250ml of distilled water, 1mol of cetyl methacrylate and 1.8mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 20g of tetrabutyl titanate catalyst and 100ml of cetyl trimethyl ammonium bromide emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid; B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the mol ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 4: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.2: 1.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Comparative example 1 (differing from example 1 in that it was not prepared in advance as a semi-finished pulp but directly pulped.) a method for preparing a low basis weight transfer printing base paper with stable permeation and heat permeation resistance, comprising the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material pulp and the auxiliary agent, wherein the pulping concentration is 3.9 percent and the pulping degree is 29 degrees SR, and preparing mixed pulp; the raw material pulp comprises 30% of long fiber bleached softwood pulp and 70% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The raw material pulp comprises bleached softwood long fiber pulp with the fiber length of 3-3.5mm and bleached hardwood short fiber pulp with the fiber length of 1.0-1.5 mm.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.1: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.3 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 230ml of distilled water, 1.3mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 21g of tetrabutyl titanate serving as a catalyst and 90ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.8: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.1: 1.2.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Comparative example 2 (different from example 1 in that hexadecylmethacrylate-N-methylolacrylamide-styrene polymer was prepared by one-shot method.)
A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 30% of long fiber bleached softwood pulp and 70% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.9% and the beating degree to be 26 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.9% and the beating degree to be 29 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.1: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.3 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparation of the polymer: under magnetic stirring, adding 230ml of distilled water, 1.3mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container, adding 21g of catalyst tetrabutyl titanate after 3mol of styrene is completely dissolved, controlling the temperature at 70 ℃ and reacting for 1 hour; slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature;
B. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.1: 1.2.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Comparative example 3 (different from example 1 in that the coating speed was 3 m/min. too fast)
A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 30% of long fiber bleached softwood pulp and 70% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.9% and the beating degree to be 26 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.9% and the beating degree to be 29 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.1: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 3 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 230ml of distilled water, 1.3mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 21g of tetrabutyl titanate serving as a catalyst and 90ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.8: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.1: 1.2.
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Comparative example 4 (which differs from example 1 in that the cetyl methacrylate-N-methylolacrylamide-styrene polymer was not hydrophilically modified)
A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 30% of long fiber bleached softwood pulp and 70% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.9% and the beating degree to be 26 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.9% and the beating degree to be 29 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.1: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.3 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 230ml of distilled water, 1.3mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 21g of tetrabutyl titanate serving as a catalyst and 90ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.8: 1;
(4) sizing post-treatment: and carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product. The sectional drying conditions are as follows: slowly heating to 65 deg.C, drying for 1.3h, and heating to 105 deg.C, and drying for 50 min.
Comparative example 5 (example 1 differs in that the drying was not staged, direct high temperature stage drying.)
A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration comprises the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry; the raw material pulp comprises 30% of long fiber bleached softwood pulp and 70% of short fiber bleached broad leaf pulp; the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.65kg per ton of paper; the dosage of the defoaming agent is 0.45kg per ton of paper.
The preparation process of the fibers in the raw material slurry comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 170kwh, the beating concentration to be 3.9% and the beating degree to be 26 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm is crushed by a hydrapulper and transferred into a front beating pool, then transferred into a back beating pool of short fibers by a double-disc refiner, and the semi-finished short-staple pulp is prepared by controlling the beating power to be 160kwh, the beating concentration to be 3.9% and the beating degree to be 29 DEG SR.
(2) Sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper; the volume ratio of the white dextrin solution to the mixed slurry is 1.1: 1;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the sizing method adopts a blade coating method and an air knife coating method which are alternately carried out, and the coating speed is 1.3 m/min.
The preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding 230ml of distilled water, 1.3mol of cetyl methacrylate and 1.6mol of N-hydroxymethyl acrylamide into a container under magnetic stirring, adding 21g of tetrabutyl titanate serving as a catalyst and 90ml of hexadecyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature at 70 ℃, and reacting for 1 hour to prepare cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 100 ℃, reacting for 1.8h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature; the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid is 3.8: 1;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 68 ℃, and stirring for 1.3 hours to obtain a modified hexadecyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer; the molar ratio of 2, 2-dimethylolpropionic acid to polymer was 1.1: 1.2.
(4) sizing post-treatment: and heating the paper sheet subjected to surface sizing treatment to 105 ℃, drying for 1.2h, performing calendaring finishing, and rolling to obtain a finished product.
TABLE 1 Low basis weight transfer printing base papers for various performance indexes
Figure BDA0002504602270000161
And (4) conclusion: examples 1-5 show that, within the preparation formula and process range of the invention, the pulp refining process is changed to reduce the generation of fine broken fibers and enhance the strength of low basis weight paper sheets; by optimizing the base paper process and the coating process of the low-quantitative thermal transfer base paper, the low-quantitative thermal transfer base paper with good high transfer performance is developed, the deep color transfer effect of customers can be met, the density is high, the water resistance is good, and the low thermal shrinkage rate is low;
the difference between the comparative example 1 and the example 1 is that the semi-finished pulp is not prepared in advance, but is directly pulped, the original mixed pulping is changed into the mixed pulping of needle-leaf semi-finished pulp and broad-leaf semi-finished pulp, and then the mixed pulping is further pulped by mixing with an auxiliary agent, so that the cutting effect of the fiber is avoided as much as possible while the fiber combination area is increased; the generation of fine broken fibers is reduced, and the strength of the low-basis weight paper sheet is enhanced; in addition, the continuity of the low-basis-weight base paper is ensured by the matching of the exact proportion of long and short fibers, and the direct mixing and beating can obviously reduce the connection performance between the fibers of the base paper under the same low-basis-weight base paper condition.
Comparative example 2 differs from example 1 in that a one-step process was used to prepare a cetyl methacrylate-N-methylolacrylamide-styrene polymer; the one-step preparation method can ensure that the molecular weight and the macromolecular diameter distribution range of the obtained polymer macromolecules are larger, and styrene units are directly polymerized on the main chain of the polymer macromolecules, so that the tensile strength of an adhesive film is increased, the elongation at break is reduced, the brittleness temperature is increased, the hardness is increased, and further the mechanical property of the film is reduced.
Comparative example 3 differs from example 1 in that the blade coating speed was too fast at 3 m/min; because the macromolecular polymerization of the glue solution contains the polymerization monomer with a longer carbon chain structure and the benzene ring structure, if the coating speed is too high, the macromolecular chains are not distributed in order, so that the macromolecular framework in the glue layer contains more defects, and the mechanical property of the base paper is reduced.
Comparative example 4 differs from example 1 in that the cetyl methacrylate-N-methylolacrylamide-styrene polymer was not hydrophilically modified; the printing ink contains a large amount of printing ink dissolving solvent besides printing ink components, if transfer printing base paper on the solvent only contains oleophilic groups, the oleophilic groups have poor polarity, and the transfer printing base paper has poor affinity to the solvent, which inevitably causes separation of printing ink solute and polar solvent in the printing ink, and is not favorable for permeation and attachment of the printing ink on a printed object after transfer printing.
Comparative example 5 differs from example 1 in that the drying was not staged, and was directly high temperature stage dried; the water on the surface of the sizing agent is evaporated to dryness quickly, the surface of the sizing agent forms a film quickly, water vapor and micromolecular bubbles in the sizing agent cannot escape in time, and defects are caused in the inside instantly, but the low-quantitative transfer printing base paper coating film is low in compactness and external waterproof capacity due to excessive gaps, the overall strength of the low-quantitative transfer printing base paper is poor, and the number of impurity particles is large; meanwhile, polymer macromolecular chains cannot be sufficiently fused in a flowing manner, the bonding performance is poor, and the mechanical property of the low-basis-weight transfer printing base paper is reduced.
The embodiments described above are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the claims below.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (6)

1. A preparation method of low-basis weight transfer printing base paper with stable seepage prevention and heat penetration is characterized by comprising the following preparation steps:
(1) preparing slurry: mixing and pulping the raw material slurry and the auxiliary agent to prepare mixed slurry;
the raw material slurry comprises long fiber slurry and short fiber slurry, and the preparation process comprises the following steps:
1) preparing long fiber slurry: crushing bleached softwood long fiber wood pulp with the fiber length of 3-3.5mm by a hydrapulper, transferring the crushed pulp into a front beating pool, passing through a double-disc refiner, transferring into a long fiber beating pool, and controlling the beating power to be 160-180kwh, the beating concentration to be 3.7-4.0% and the beating degree to be 25-28 DEG SR to prepare semi-finished pulp long fiber pulp;
2) preparing short fiber slurry: the method comprises the steps of (1) crushing bleached broad-leaved short-staple wood pulp with the fiber length of 1.0-1.5mm by a hydrapulper, transferring the crushed broad-leaved short-staple wood pulp into a front beating pool, transferring the crushed broad-leaved short-staple wood pulp into a back beating pool by a double-disc refiner, and controlling the beating power to be 150-170kwh, the beating concentration to be 3.7-4.0% and the beating degree to be 28-30 DEG SR to prepare semi-finished pulp short-staple pulp;
(2) sizing pretreatment: soaking the mixed pulp in a white dextrin solution, dehydrating the net part, squeezing and drying to obtain raw paper;
(3) sizing: entering a surface sizing treatment process, and performing surface sizing on the raw paper in the step (2) by adopting a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer to obtain a paper sheet subjected to surface sizing treatment; the glue applying mode adopts a scraper coating mode and an air knife coating mode to be carried out alternately, and the coating speed is 1-1.5 m/min;
the preparation method of the modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer comprises the following steps:
A. preparing a seed emulsion: adding distilled water, cetyl methacrylate and N-hydroxymethyl acrylamide into a container under magnetic stirring, adding tetrabutyl titanate serving as a catalyst and cetyl trimethyl ammonium bromide serving as an emulsifier after complete dissolution, controlling the temperature to be 65-75 ℃, and reacting for 0.8-1.2h to obtain cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid;
B. preparation of the polymer: adding styrene into the seed liquid, slowly heating to 95-105 ℃, reacting for 1.5-2h to obtain semitransparent viscous liquid, and adjusting the pH value to be neutral when the temperature of the liquid is reduced to room temperature;
C. hydrophilic modified polymer: adding 2, 2-dimethylolpropionic acid into the polymerized polymer solution, heating to 65-70 ℃, and stirring for 1-1.5h to obtain a modified cetyl methacrylate-N-hydroxymethyl acrylamide-styrene polymer;
(4) sizing post-treatment: carrying out post-sectional drying, press polishing and finishing on the paper sheet subjected to surface sizing treatment, and rolling to obtain a finished product; the sectional drying conditions are as follows: slowly heating to 60-70 deg.C, drying for 1.2-1.5h, heating to 100 deg.C, and drying at 110 deg.C for 40-60 min.
2. The method for preparing an impermeable, diathermically stable low basis weight transfer printing base paper according to claim 1, wherein the stock slurry comprises 20-40% long fiber bleached softwood pulp and 60-80% short fiber bleached broad leaf pulp.
3. The preparation method of the low-basis weight transfer printing base paper with the advantages of seepage prevention and heat penetration stability as claimed in claim 1, wherein the auxiliary agents and the dosage thereof are respectively as follows: the dosage of the degasifier is 0.5-0.8kg per ton of paper; the dosage of the defoaming agent is 0.3-0.6kg per ton of paper.
4. The preparation method of the impermeable, diathermy stable low-basis weight transfer printing base paper as claimed in claim 1, wherein the volume ratio of the white dextrin solution to the mixed size in the step (2) is 1-1.2: 1.
5. the method for preparing a low basis weight transfer printing base paper with stable seepage and heat penetration resistance according to claim 1, wherein the ratio of the distilled water, the cetyl methacrylate, the N-methylolacrylamide, the tetrabutyl titanate and the hexadecyl trimethyl ammonium bromide in the step A is as follows: (200- > 250 ml): (1-1.5 mol): (1.5-1.8 mol): (20-22 g): (80-100 ml).
6. The method for preparing the low-basis weight transfer printing base paper with the advantages of seepage prevention and heat penetration stability as claimed in claim 1, wherein the molar ratio of the styrene to the cetyl methacrylate-N-hydroxymethyl acrylamide seed liquid in the step B is 3.5-4: 1; in the step C, the molar ratio of the 2, 2-dimethylolpropionic acid to the polymer is 1-1.2: 1-1.4.
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