CN113882189B - Transfer printing paper and production method thereof - Google Patents

Transfer printing paper and production method thereof Download PDF

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Publication number
CN113882189B
CN113882189B CN202111236593.8A CN202111236593A CN113882189B CN 113882189 B CN113882189 B CN 113882189B CN 202111236593 A CN202111236593 A CN 202111236593A CN 113882189 B CN113882189 B CN 113882189B
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parts
transfer printing
printing paper
starch
modified starch
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CN113882189A (en
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黄志龙
华连进
徐洁
董林海
徐军
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Hangzhou Lin'an Taoyuan Paper Co ltd
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Hangzhou Lin'an Taoyuan Paper Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/46—Non-macromolecular organic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/64—Inorganic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape

Abstract

The application relates to the technical field of transfer printing paper, and particularly discloses transfer printing paper and a production method thereof, wherein the transfer printing paper comprises base paper and a coating composition coated on the base paper, and the coating composition comprises the following components in parts by weight: 10-20 parts of sodium alginate, 3-15 parts of titanium dioxide, 5-10 parts of modified starch, 2-8 parts of styrene-acrylic latex, 3-5 parts of calcium stearate, 2-6 parts of cationic polyacrylamide, 0.5-2.5 parts of graphene oxide, 4-10 parts of isothiazolinone bactericide, 3-5 parts of china clay, 1-3 parts of aluminum sulfate, 2-8 parts of polyvinyl alcohol fiber, 1-4 parts of sodium carboxymethylcellulose, 4-10 parts of silane coupling agent and 5-8 parts of eggshell membrane. The transfer printing paper prepared by the method reduces the porosity after film forming, further reduces the air permeability of the formed film, can prevent ink particles from penetrating through the paper sheet of the base paper, and further improves the ink transfer rate of the transfer printing paper.

Description

Transfer printing paper and production method thereof
Technical Field
The application relates to the technical field of transfer printing paper, in particular to transfer printing paper and a production method thereof.
Background
The transfer printing is a printing method which prints dyes on various materials such as paper, plastics, wood, glass, metal, rubber and the like, and then transfers the dyes on the transfer paper to fabrics under certain conditions, and is widely used for printing chemical fiber knitgoods and clothes.
The transfer printing process comprises a sublimation method, a migration method, a melting method and an ink layer stripping method, wherein the thermal transfer method is a method for sublimating and transferring dye on transfer paper to dyed synthetic fibers by using heat, and the wet transfer method is a printing method for transferring dye to printed fabrics by stripping the dye from the transfer paper by using the action of certain temperature, pressure and solvent.
With the rapid development of paper and paint industries, the thermal transfer printing technology is widely used because the generated patterns have the advantages of bright colors, excellent fidelity, good layering, small color difference and the like, and has the advantage of reducing printing pollution in practical application compared with the traditional printing industry, so that the thermal transfer printing technology is widely applied to various fields.
In view of the above-mentioned techniques, the inventors of the present invention have considered that thermal transfer printing paper on the market still has the disadvantages of poor ink transfer, high residual amount of ink or dye, and the like.
Thus, there remains a need for a transfer printing paper that can improve ink transfer rates.
Disclosure of Invention
In order to solve the problem of high residual quantity of ink or dye, the application provides transfer printing paper and a production method thereof.
In a first aspect, the application provides a transfer printing paper, which adopts the following technical scheme:
a transfer printing paper comprises base paper and a coating composition coated on the base paper, wherein the coating composition comprises the following components in parts by weight: 10-20 parts of sodium alginate, 3-15 parts of titanium dioxide, 5-10 parts of modified starch, 2-8 parts of styrene-acrylic latex, 3-5 parts of calcium stearate, 2-6 parts of cationic polyacrylamide, 0.5-2.5 parts of graphene oxide, 4-10 parts of isothiazolinone bactericide, 3-5 parts of china clay, 1-3 parts of aluminum sulfate, 2-8 parts of polyvinyl alcohol fiber, 1-4 parts of sodium carboxymethylcellulose, 4-10 parts of silane coupling agent and 5-8 parts of eggshell membrane.
By adopting the technical scheme, the sodium alginate has good fluidity, hygroscopicity and film forming property, the viscosity of the composition can be improved, the viscosity of the sodium alginate can be greatly improved by adding calcium stearate and a silane coupling agent, the film forming property of the composition is further improved, the modified starch has good film forming property, the modified starch serving as a thickening agent, a stabilizing agent, a gelling agent and an adhesive is matched with graphene oxide, the viscosity of the composition can be adjusted, the modified starch and the graphene oxide form a physical cross-linking network, the porosity after film forming is further reduced, the air permeability of the formed film is further reduced, the eggshell film can coat the modified starch and the graphene oxide, communicated pores are further blocked, ink particles can be prevented from permeating paper sheets of base paper, and the ink transfer rate of the transfer printing paper is further improved.
The styrene-acrylic latex can change the air permeability, elasticity and water absorption of the coating composition, the film-forming property of sodium carboxymethylcellulose and the good hardness, moisture absorption and thermal stability of titanium dioxide are added, the water evaporation in the composition can be avoided, the physical and mechanical properties of the coating composition can be improved by adding the china clay and the polyvinyl alcohol fibers, the drying speed of the coating composition and the strength and toughness of base paper are improved, the service life of the composition is further prolonged, the characteristics of fine and smooth surface, good film coverage and the like of the finished paper are guaranteed, the sublimation ink can be smoothly separated from the paper during thermal transfer printing to be transferred to an article needing printing, the ink residual quantity on the transferred paper is reduced, and the pollution of the residual ink on the paper to the environment is effectively reduced.
Preferably, the coating composition comprises the following components in parts by weight: 12-18 parts of sodium alginate, 5-10 parts of titanium dioxide, 6-9 parts of modified starch, 4-6 parts of styrene-acrylic latex, 3.5-4.5 parts of calcium stearate, 3-5.5 parts of cationic polyacrylamide, 1-2 parts of graphene oxide, 5-8 parts of isothiazolinone bactericide, 4-5 parts of china clay, 2-3 parts of aluminum sulfate, 3-6 parts of polyvinyl alcohol fiber, 2-3.5 parts of sodium carboxymethylcellulose, 5-8 parts of silane coupling agent and 6-7.5 parts of eggshell membrane.
By adopting the technical scheme, the proportion of each component in the coating composition is optimized, the comprehensive performances of the coating composition such as viscosity, film forming property and porosity are further improved, the ink transfer rate of the transfer printing paper is improved, the ink can be smoothly separated from the paper and transferred to an article needing to be printed, and the residual quantity of the ink on the paper after transfer printing is reduced.
Preferably, the styrene-acrylic latex is selected from styrene-acrylate emulsion with solid content of 45-50%.
By adopting the technical scheme, the styrene-acrylate emulsion has the advantages of good water resistance, weather resistance, durability, high bonding strength and the like, and is used as a film forming substance in the coating composition, so that the water resistance, compactness, scrubbing resistance and adhesive force of a coating film are greatly improved.
Preferably, the polyvinyl alcohol fibers are selected from easily soluble polyvinyl alcohol fibers, and the length of the easily soluble polyvinyl alcohol fibers is 3-6 mm.
By adopting the technical scheme, the easily soluble polyvinyl alcohol fiber forms a layer of relatively continuous film among the fibers after being dissolved in the composition, so that the strength of the paper sheet is increased, the water resistance of the paper sheet can be improved, the ink is not easy to permeate into the paper sheet in the later printing process, and the transfer rate of the ink is improved.
Preferably, the preparation method of the modified starch comprises the following steps:
(1) adding a starch raw material into a sodium hydroxide solution with the mass concentration of 1.5-4.5%, and uniformly mixing and stirring to obtain starch slurry with the mass concentration of 40-50%;
(2) adding a modifier with the mass concentration of 5-10% into the starch slurry obtained in the step (1), and then reacting at 20-60 ℃ for 8-15h to obtain modified starch slurry; the modifier is a mixed solution of chitosan, sodium sulfate and citric acid;
(3) adding a synergistic additive with the mass concentration of 10-20% into the modified starch slurry obtained in the step (2) to obtain a crude slurry; the synergistic auxiliary is a mixture of silicone oil, sodium silicate and polyester, and the using amount of the synergistic auxiliary is 0.2-2% of the mass of the starch raw material;
(4) and (4) finally, filtering, washing, dehydrating, drying and screening the coarse slurry obtained in the step (3) to obtain the modified starch.
By adopting the technical scheme, the starch is added into the sodium hydroxide solution to be easier to hydrolyze, the modifier is added into the obtained starch slurry, the beta-1, 4-glycosidic bond of chitosan in citric acid can be slowly hydrolyzed to generate chitosan with low relative molecular mass, the sodium sulfate can promote the hydrolysis of the chitosan, the chitosan is dissolved in the citric acid to form a cationic group with positive charge, the chitosan is a polyelectrolyte with positive charge in the solution and has strong adsorbability, and because the starch and the chitosan are both of polysaccharide unit structures, a large amount of hydroxyl and amino exist in molecules, metal ion complexation, hydrogen bonds, hydrophobic interaction and electrostatic interaction are easy to occur, so that the adhesion performance of the solution can be endowed; in addition, hydrogen bond interaction occurs between molecular chains of two polysaccharides in the system to form a physical cross-linked network, so that the solution is endowed with good mechanical properties; the addition of the synergistic auxiliary agent further increases the viscosity of the solution, the silicone oil has good chemical stability and hydrophobic property, the sodium silicate has good adhesion property, the polyester is used as a coupling agent to increase the affinity between the silicone oil and the sodium silicate, meanwhile, macromolecules in the modified starch slurry are not easy to agglomerate, finally, the modified starch is obtained through filtering, washing and drying, and the modified starch can be widely applied to the production process of thermal transfer printing paper coating, and has outstanding performance particularly in the aspects of ink transfer rate and paper smoothness.
Preferably, the starch raw material in step (1) is selected from one or more of corn starch, tapioca starch, potato starch, wheat starch and pea starch.
Preferably, the weight ratio of the chitosan, the sodium sulfate and the citric acid in the step (2) is 1:2-5: 5-10.
Through adopting above-mentioned technical scheme, have active hydroxyl and amino in the chitosan macromolecule, they have stronger chemical reaction ability, and citric acid can hydrolyze the chitosan macromolecule, and the sodium sulfate can promote the hydrolysis of chitosan, through taking place metal ion complex, hydrogen bond, hydrophobic interaction and electrostatic interaction to improve the adhesion properties of solution, through above-mentioned reasonable ratio scope, make modified starch have higher cohesiveness and film forming ability.
Preferably, the weight ratio of the silicone oil, the sodium silicate and the polyester in the step (3) is 1:5-10: 6-15.
By adopting the technical scheme, the silicone oil has heat resistance, weather resistance, hydrophobicity, physiological inertia and smaller surface tension, in addition, the silicone oil also has low viscosity-temperature coefficient and higher compression resistance, the sodium silicate has better bonding performance, the polyester is used as a coupling agent to increase the affinity between the silicone oil and the sodium silicate, the synergistic additive is added into the modified starch slurry to further increase the bonding performance and the film forming performance of the modified starch slurry, so that macromolecules in the modified starch slurry are not easy to agglomerate, and through the reasonable proportioning range, the modified starch has higher bonding performance and film forming performance and is beneficial to improving the transfer rate of subsequent printing ink.
In a second aspect, the application provides a production method of the transfer printing paper, which adopts the following technical scheme:
a production method of transfer printing paper comprises the following steps: mixing the components of the coating composition, stirring at 40-60 ℃ for 10-24h to obtain the coating composition, and then coating a single layer of the coating composition on one side of base paper, wherein the gluing amount is 2-5g/m 2 Drying at the temperature of 120-160 ℃, performing secondary sizing after calendaring, wherein the sizing amount is 4-9g/m 2 And carrying out secondary drying at the temperature of 150-180 ℃ to obtain the transfer printing paper.
By adopting the technical scheme, the single surface of the coating composition is coated on the base paper, the coating composition adopting the sodium carboxymethylcellulose and the sodium alginate has better film forming property, and is matched with the eggshell film and the graphene oxide, so that the air permeability of the coating composition is further reduced, the bearing and the transfer of the ink are more facilitated, the residue of the ink on the transfer printing paper is reduced, the base paper is favorably ensured to have good cohesiveness and film forming property by adopting twice gluing and drying, the transfer rate of the heat transfer ink is improved, and the probability of the ink remaining on the base paper is reduced.
In summary, the present application has the following beneficial effects:
1. because the modified starch has good film-forming property, the modified starch serving as a thickening agent, a stabilizing agent, a gelling agent and an adhesive is matched with graphene oxide to adjust the viscosity of the composition, and the modified starch and the graphene oxide form a physical cross-linked network, so that the porosity after film forming is reduced, the air permeability of the formed film is further reduced, the eggshell film can coat the modified starch and the graphene oxide, communicated pores are further blocked, ink particles can be prevented from penetrating through paper sheets of base paper, and the ink transfer rate of the transfer printing paper is further improved.
2. According to the method, starch is added into a sodium hydroxide solution to enable the starch to be hydrolyzed more easily, a modifier is added into obtained starch slurry, a beta-1, 4-glycosidic bond of chitosan in citric acid can be hydrolyzed slowly, sodium sulfate can promote the hydrolysis of the chitosan, the chitosan is dissolved in the citric acid to form a positively charged cationic group, the chitosan is a positively charged polyelectrolyte in the solution and has strong adsorbability, and both the starch and the chitosan are polysaccharide unit structures and are easy to generate metal ion complexation, hydrogen bonds, hydrophobic interaction and electrostatic interaction, so that the solution can be endowed with adhesive performance; the addition of the synergist further increases the viscosity of the solution.
3. The silicone oil has good chemical stability and hydrophobic property, the sodium silicate has good adhesion property, the polyester is used as a coupling agent, the affinity between the silicone oil and the sodium silicate is increased, meanwhile, macromolecules in modified starch slurry are not prone to agglomeration, finally, the modified starch is obtained through filtering, washing and drying, and the modified starch can be widely applied to the production process of thermal transfer printing paper coatings, and is especially outstanding in the aspects of ink transfer rate and paper smoothness.
Detailed Description
The present application will be described in further detail with reference to examples.
The starting materials used in the examples are all commercially available.
Preparation example of modified starch
Preparation example 1
The preparation method of the modified starch comprises the following steps:
(1) adding 10 parts by mass of starch raw materials into a sodium hydroxide solution with the mass concentration of 3%, and uniformly mixing and stirring to obtain starch slurry with the mass concentration of 45%;
(2) adding a modifier with the mass concentration of 8% into the starch slurry obtained in the step (1), and then reacting at 40 ℃ for 12h to obtain modified starch slurry; the modifier is a mixed solution of chitosan, sodium sulfate and citric acid; the using amount of the modifier is 1.1 percent of the mass of the starch raw material; the weight ratio of the chitosan to the sodium sulfate to the citric acid is 1:2.5: 8;
(3) adding a synergistic additive with the mass concentration of 15% into the modified starch slurry obtained in the step (2) to obtain a crude slurry; the synergistic auxiliary is a mixture of silicone oil, sodium silicate and polyester, and the using amount of the synergistic auxiliary is 1.2% of the mass of the starch raw material; the weight ratio of the silicone oil to the sodium silicate to the polyester is 1:8: 12;
(4) and (4) filtering, washing, dehydrating, drying and screening the coarse slurry obtained in the step (3) to obtain the modified starch.
Preparation example 2
The preparation method of the modified starch comprises the following steps:
(1) adding 20 parts by mass of starch raw materials into a sodium hydroxide solution with the mass concentration of 1.5%, and uniformly mixing and stirring to obtain starch slurry with the mass concentration of 40%;
(2) adding a modifier with the mass concentration of 5% into the starch slurry obtained in the step (1), and then reacting at 20 ℃ for 15h to obtain modified starch slurry; the modifier is a mixed solution of chitosan, sodium sulfate and citric acid; the using amount of the modifier is 0.8 percent of the mass of the starch raw material; the weight ratio of the chitosan to the sodium sulfate to the citric acid is 1:5: 10;
(3) adding a synergistic additive with the mass concentration of 20% into the modified starch slurry obtained in the step (2) to obtain a crude slurry; the synergistic auxiliary is a mixture of silicone oil, sodium silicate and polyester, and the using amount of the synergistic auxiliary is 0.2 percent of the mass of the starch raw material; the weight ratio of the silicone oil to the sodium silicate to the polyester is 1:5: 15;
(4) and (4) filtering, washing, dehydrating, drying and screening the coarse slurry obtained in the step (3) to obtain the modified starch.
Preparation example 3
The preparation method of the modified starch comprises the following steps:
(1) adding 30 parts by mass of starch raw materials into a sodium hydroxide solution with the mass concentration of 4.5%, and uniformly mixing and stirring to obtain starch slurry with the mass concentration of 50%;
(2) adding a modifier with the mass concentration of 10% into the starch slurry obtained in the step (1), and then reacting for 8 hours at 60 ℃ to obtain modified starch slurry; the modifier is a mixed solution of chitosan, sodium sulfate and citric acid; the using amount of the modifier is 1.5 percent of the mass of the starch raw material; the weight ratio of the chitosan to the sodium sulfate to the citric acid is 1:2: 5;
(3) adding a synergistic additive with the mass concentration of 10% into the modified starch slurry obtained in the step (2) to obtain a crude slurry; the synergistic auxiliary is a mixture of silicone oil, sodium silicate and polyester, and the usage amount of the synergistic auxiliary is 2% of the mass of the starch raw material; the weight ratio of the silicone oil to the sodium silicate to the polyester is 1: 10: 6;
(4) and (4) filtering, washing, dehydrating, drying and screening the coarse slurry obtained in the step (3) to obtain the modified starch.
Examples 1 to 5
As shown in Table 1, examples 1 to 5 are different in the ratio of raw materials.
The following is illustrated by example 1, wherein the styrene-acrylic latex is selected from styrene-acrylate emulsions having a solids content of 50%; the polyvinyl alcohol fiber is selected from soluble polyvinyl alcohol fiber, and the length of the soluble polyvinyl alcohol fiber is 3 mm; the modified starch was selected from the modified starches prepared in preparation example 1.
The transfer printing paper provided in example 1 was produced as follows:
mixing the components of the coating composition, stirring at 50 deg.C for 18h to obtain coating composition, and coating the coating composition on one side of base paper with single layer coating, wherein the coating amount is 3g/m 2 Drying at 150 deg.C for 15h, calendering, and applying glue at 7g/m 2 And secondarily drying the paper at the temperature of 160 ℃ for 20 hours to obtain the transfer printing paper.
TABLE 1 component amounts of coating compositions in examples 1-5
Example 1 Example 2 Example 3 Example 4 Example 5
Sodium alginate 14 10 20 12 18
Titanium white powder 8 3 15 5 10
Modified starch 8 5 10 6 9
Styrene-acrylic latex 5 2 8 4 6
Calcium stearate 4 3 5 3.5 4.5
Cationic polyacrylamides 4.5 2 6 3 5.5
Graphene oxide 1.5 0.5 2.5 1 2
Isothiazolinone bactericide 7 10 4 8 5
Porcelain clay 4 5 3 5 4
Aluminium sulphate 2 1 3 2 3
Polyvinyl alcohol fiber 4 8 2 6 3
Sodium carboxymethylcellulose 3 4 1 2 3.5
Silane coupling agent 7 10 4 8 5
Eggshell membrane 7 8 5 6 7.5
Example 6
The difference from example 1 is that the modified starch is selected from the modified starches prepared in preparation example 2.
Example 7
The difference from example 1 is that the modified starch is selected from the modified starches prepared in preparation example 3.
Example 8
The difference from example 1 is that the modified starch is hydroxypropyl cross-linked tapioca starch.
Example 9
The difference from example 1 is that the transfer printing paper is produced as follows: mixing the components of the coating composition, stirring at 60 deg.C for 10 hr to obtain coating composition, and coating the coating composition on one side of base paper with a single layer coating amount of 2g/m 2 Drying at 120 deg.C for 12 hr, calendering, and secondary sizing with sizing amount of 9g/m 2 And carrying out secondary drying at the temperature of 180 ℃ for 20h to obtain the transfer printing paper.
Example 10
The difference from example 1 is that the transfer printing paper is produced by the following method: mixing the components of the coating composition, stirring at 40 deg.C for 24 hr to obtain coating composition, and coating the coating composition on one side of base paper with a single layer coating amount of 5g/m 2 Drying at 160 deg.C for 8 hr, calendering, and secondary sizing with sizing amount of 4g/m 2 And carrying out secondary drying at the temperature of 150 ℃ for 24h to obtain the transfer printing paper.
Example 11
The difference from example 1 is that the transfer printing paper is produced by a method comprising: coating a single layer of coating composition on one side of base paper, wherein the sizing amount is 10g/m 2 And drying at the temperature of 150 ℃ for 30 hours, and calendaring to obtain the transfer printing paper.
Example 12
The difference from example 1 is that in the preparation method of the modified starch, the weight ratio of chitosan, sodium sulfate and citric acid in step (2) is 1:8: 2.
Example 13
The difference from example 1 is that in the preparation method of the modified starch, the weight ratio of the silicone oil, the sodium silicate and the polyester in step (3) is 1:12: 18.
Comparative example
Comparative example 1
The difference from example 1 is that the modified starch in the composition is replaced by the same mass of sodium alginate.
Comparative example 2
The difference from example 1 is that the graphene oxide in the composition is replaced by the same mass of sodium alginate.
Comparative example 3
The difference from example 1 is that the eggshell membrane in the composition was replaced with an equal mass of sodium alginate.
Comparative example 4
The difference from example 1 is that the modified starch and graphene oxide in the composition were replaced with an egg shell membrane of equal quality.
Comparative example 5
The difference from example 1 is that the graphene oxide and eggshell membrane in the composition were replaced with the same mass of modified starch.
Performance test
The modified starches obtained in preparation examples 1 to 3 were tested for various performance indexes, and the performance indexes of the products are shown in table 2 (starch for certain foreign special thermal transfer printing paper purchased in the market is taken as a reference example).
TABLE 2 product Performance indices
Detecting items Color Whiteness degree Fineness% (100 mesh sieve) Water content% Viscosity mpa.s Fluidity s Sedimentation value cm
Preparation example 1 White powder 90.25 99.51 11.36 8.35 15.95 11.65
Preparation example 2 White powder 90.12 99.35 13.02 8.45 16.25 12.06
Preparation example 3 White powder 90.15 99.53 12.31 8.39 15.99 11.99
Commercially available products White powder 90.03 99.39 12.49 8.19 16.61 12.09
The transfer printing papers prepared in examples 1 to 13 and comparative examples 1 to 5 were subjected to the relevant tests, and the test results are shown in Table 3.
TABLE 3 Performance indices of the transfer printed papers of examples 1-13 and comparative examples 1-5
Detecting items Air permeability um/Pa.s Tensile index N.m/g Color density before transfer Color density after transfer The transfer rate%
Example 1 2.98 70.3 1.15 0.28 95.3
Example 2 3.45 67.3 1.13 0.21 93.5
Example 3 3.31 68.1 1.10 0.35 94.3
Example 4 3.25 69.4 1.12 0.31 93.4
Example 5 3.12 69.5 1.13 0.22 94.6
Example 6 3.02 69.9 1.12 0.23 94.9
Example 7 3.08 69.7 1.14 0.25 94.7
Example 8 5.13 62.3 1.20 0.21 82.5
Example 9 3.11 69.4 1.15 0.35 93.2
Example 10 3.15 69.1 1.16 0.32 93.4
Example 11 3.32 68.3 1.14 0.38 90.3
Example 12 3.22 67.3 1.13 0.26 92.3
Example 13 3.29 67.1 1.12 0.28 92.6
Comparative example 1 4.53 63.4 1.15 0.41 75.2
Comparative example 2 4.49 63.9 1.14 0.45 76.4
Comparative example 3 4.42 64.1 1.16 0.48 76.9
Comparative example 4 4.59 62.9 1.14 0.43 74.5
Comparative example 5 4.39 64.2 1.13 0.43 77.4
As can be seen from the data in Table 2, the modified starch prepared in the present application has better properties than the commercially available products, wherein the modified starch prepared in preparation example 1 is most preferable, the transfer printing papers prepared in examples 1 to 5 use the modified starch prepared in preparation example 1, and the modified starch in example 8 is hydroxypropyl crosslinked tapioca starch, and as can be seen from the data in Table 3, the transfer printing papers prepared in examples 1 to 5 have air permeability of 2.98 to 3.45 um/Pa.s, tensile index of 67.3 to 70.3N.m/g, color density after transfer of 0.21 to 0.35, and transfer rate of 93.4 to 95.3%, which are far better than the properties of example 8 (example 8), and it can be seen that the transfer printing papers prepared in examples 1 to 5 have lower air permeability, higher tensile index and higher ink transfer rate than example 8, the probability of ink residue on the base paper is reduced.
Examples 6-7 the modified starches were selected from the modified starches prepared in preparation examples 2-3, respectively, and it can be seen from the data that the transfer printed papers prepared in examples 6-7 had higher air permeability (air permeability of 3.02-3.08 um/pa.s) than the transfer printed paper prepared in example 1, had lower tensile index than example 1 (tensile index of 69.7-69.9 n.m/g), had lower transfer rate than example 1 (transfer rate of 94.7-94.9%), it can be seen that the change in parameters during the preparation of the modified starch affected the properties of the coating composition, the ratio of the components in the modifier and the synergist in examples 12-13 was changed, respectively, and it can be seen from table 3 that the transfer printed papers prepared in examples 12-13 had air permeability of 3.22-3.29 um/pa.s, tensile index of 67.1-67.3n.m/g, the transfer rate is 92.3-92.6%, and the performance parameters are obviously inferior to those of example 1, thus knowing that the proportions of the components in the modifier and the synergist further influence the performances of the coating composition.
Examples 9-10 differ from example 1 in the change of parameters in the process for producing the transfer printing paper, and as can be seen from table 3, the transfer printing papers prepared in examples 9-10 had air permeabilities of 3.11-3.15 um/pa.s, tensile indices of 69.1-69.4n.m/g, and transfer rates of 93.2-93.4%, which were varied from example 1 but did not differ significantly in the difference between the performance parameters, whereas example 11 used one coating and one drying, and as can be seen from table 3, the transfer printing papers prepared in example 11 had air permeabilities of 3.32um/pa.s, tensile indices of 68.3n.m/g, and transfer rates of 90.3%, which were significantly different from the performance parameters of examples 9-10, and it was known that the manner in which the transfer printing papers were coated affected the ink transfer rates of the transfer printing papers.
Comparative examples 1 to 3 lack the modified starch, the graphene oxide and the eggshell membrane respectively, and as can be seen from table 3, the air permeability of the transfer printing paper prepared in comparative example 1 is 4.53 um/pa.s, the tensile index is 63.4 n.m/g, the transfer rate is 75.2%, the air permeability of the transfer printing paper prepared in comparative example 2 is 4.49 um/pa.s, the tensile index is 63.9 n.m/g, and the transfer rate is 76.4%, the air permeability of the transfer printing paper prepared in comparative example 3 is 4.42 um/pa.s, the tensile index is 64.1 n.m/g, and the transfer rate is 76.9%, and the performances of comparative examples 1 to 3 are obviously inferior to those of example 1, it can be seen that the matching among the modified starch, the graphene oxide and the eggshell membrane can affect the performance of the coating composition, the modified starch and the graphene oxide form a physical cross-linked network, and further reduce the porosity after film forming, the eggshell membrane can coat the modified starch and the graphene oxide, and further block the communicated pores, so that the transfer rate of the ink can be improved, while the comparative examples 1 to 3 confirm that any one component is low in the transfer rate of the ink, while the comparative examples 4 to 5 only add the eggshell membrane or the modified starch respectively, and as can be seen from the table 3, the air permeability of the transfer printing paper prepared by the comparative examples 4 to 5 is 4.39 to 4.59 um/Pa.s, the tensile index is 62.9 to 64.2 N.m/g, and the transfer rate is 74.5 to 77.4%, so that the performance of the coating composition can be influenced by the independent addition of the modified starch and the eggshell membrane, and the transfer rate of the ink can be reduced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (7)

1. The transfer printing paper comprises base paper and a coating composition coated on the base paper, and is characterized in that the coating composition comprises the following components in parts by weight: 10-20 parts of sodium alginate, 3-15 parts of titanium dioxide, 5-10 parts of modified starch, 2-8 parts of styrene-acrylic latex, 3-5 parts of calcium stearate, 2-6 parts of cationic polyacrylamide, 0.5-2.5 parts of graphene oxide, 4-10 parts of isothiazolinone bactericide, 3-5 parts of china clay, 1-3 parts of aluminum sulfate, 2-8 parts of polyvinyl alcohol fiber, 1-4 parts of sodium carboxymethylcellulose, 4-10 parts of silane coupling agent and 5-8 parts of eggshell membrane;
the polyvinyl alcohol fibers are selected from soluble polyvinyl alcohol fibers, and the length of the soluble polyvinyl alcohol fibers is 3-6 mm;
the preparation method of the modified starch comprises the following steps:
(1) adding a starch raw material into a sodium hydroxide solution with the mass concentration of 1.5-4.5%, and uniformly mixing and stirring to obtain starch slurry with the mass concentration of 40-50%;
(2) adding a modifier with the mass concentration of 5-10% into the starch slurry obtained in the step (1), and then reacting at 20-60 ℃ for 8-15h to obtain modified starch slurry; the modifier is a mixed solution of chitosan, sodium sulfate and citric acid;
(3) adding a synergistic additive with the mass concentration of 10-20% into the modified starch slurry obtained in the step (2) to obtain a crude slurry; the synergistic auxiliary agent is a mixture of silicone oil, sodium silicate and polyester;
(4) and (4) filtering, washing, dehydrating, drying and screening the coarse pulp obtained in the step (3) to obtain the modified starch.
2. A transfer printing paper according to claim 1, characterized in that: the coating composition comprises the following components in parts by weight: 12-18 parts of sodium alginate, 5-10 parts of titanium dioxide, 6-9 parts of modified starch, 4-6 parts of styrene-acrylic latex, 3.5-4.5 parts of calcium stearate, 3-5.5 parts of cationic polyacrylamide, 1-2 parts of graphene oxide, 5-8 parts of isothiazolinone bactericide, 4-5 parts of china clay, 2-3 parts of aluminum sulfate, 3-6 parts of polyvinyl alcohol fiber, 2-3.5 parts of sodium carboxymethylcellulose, 5-8 parts of silane coupling agent and 6-7.5 parts of eggshell membrane.
3. A transfer printing paper according to claim 1, characterized in that: the styrene-acrylic latex is selected from styrene-acrylate emulsion with solid content of 45-50%.
4. A transfer printing paper according to claim 1, characterized in that: the starch raw material in the step (1) is selected from one or more of corn starch, cassava starch, potato starch, wheat starch and pea starch.
5. A transfer printing paper according to claim 1, characterized in that: the weight ratio of the chitosan, the sodium sulfate and the citric acid in the step (2) is 1:2-5: 5-10.
6. A transfer printing paper according to claim 1, characterized in that: the weight ratio of the silicone oil, the sodium silicate and the polyester in the step (3) is 1:5-10: 6-15.
7. A process for the production of a transfer printed paper as claimed in any one of claims 1 to 6, characterised in that: the method comprises the following steps: mixing the components of the coating composition, stirring at 40-60 deg.C for 10-24 hr to obtain coating composition, and coating single layer of the coating composition on one side of base paper with the coating amount of 2-5g/m 2 Drying at the temperature of 120-160 ℃, performing secondary sizing after calendaring, wherein the sizing amount is 4-9g/m 2 And carrying out secondary drying at the temperature of 150-180 ℃ to obtain the transfer printing paper.
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