CN112962350B - Water transfer printing paper and preparation method thereof - Google Patents
Water transfer printing paper and preparation method thereof Download PDFInfo
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- CN112962350B CN112962350B CN202110170180.8A CN202110170180A CN112962350B CN 112962350 B CN112962350 B CN 112962350B CN 202110170180 A CN202110170180 A CN 202110170180A CN 112962350 B CN112962350 B CN 112962350B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
- B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
- B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
- B44C1/175—Transfer using solvent
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/13—Silicon-containing 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
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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
- 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
- D21H21/22—Agents rendering paper porous, absorbent or bulky
- D21H21/24—Surfactants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses water transfer paper, and relates to the technical field of special paper. The water transfer paper is respectively provided with a back coating, base paper, a bottom coating and a top coating which are distributed layer by layer from bottom to top; the base paper is special base paper for water transfer printing with a pigment layer; the primary coating comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the primer coating comprises the following steps: (1) Uniformly mixing water and potato modified starch, and adding an oxidant to obtain a mixed solution A; (2) Stirring, heating and preserving heat the mixed solution A obtained in the step (1) to obtain a pasty coating B; (3) Cooling the pasty coating B obtained in the step (2) for the first time, adding a surfactant, uniformly stirring, and cooling for the second time to obtain the primary coating; (4) And (3) coating the base coating obtained in the step (3) on the surface of the base paper pigment layer to obtain the base coating.
Description
Technical Field
The invention relates to the technical field of special paper, in particular to water transfer paper and a preparation method thereof.
Background
The water transfer paper is used as a carrier for transferring patterns and is generally composed of three layers, wherein the lower layer is base paper, the middle layer is a film-forming adhesive layer, and the surface layer is a water-soluble adhesive layer. The water mark transfer printing technology is that after color picture and text are printed on water transfer printing paper, the water transfer printing paper is transferred to the surface of water, and the hydrosol layer is automatically dissolved in water under the action of water pressure and the base paper is extracted. And finally, uniformly transferring the color grain patterns on the surface of the product, cleaning and drying, and then coating a transparent protective coating. The surface of the product forms a three-dimensional simulation image and text, so that the product presents a distinct three-dimensional visual effect.
However, the existing water transfer printing paper production technology has defects which plague the development of industry for many years. The film-forming adhesive layer coating has the defect of short storage period after preparation, and two main solutions to the problem of short storage time in the current industry are provided: 1. adding a heat preservation tank after the preparation of the paint, wherein the heat preservation temperature is more than 85 ℃; 2. the solid content of the paint is reduced, the purpose of reducing the viscosity of the paint is achieved, and the paint is coated by adopting a plurality of coating machines, so that the coating amount meets the requirement. Both of these solutions have obvious disadvantages, as soon as the solution causes an increase in equipment investment, while the equipment is idle during the production improvement, and at the same time increases the energy consumption. And the second scheme increases the production cost and reduces the efficiency. In addition, traditional water transfer printing paper production adopts scraper or bar coating mode more, causes the paper surface to have the scratch, and roughness is big, is unfavorable to the printing. Thirdly, the traditional water transfer printing paper is produced by adopting a small-sized coating machine, the speed is lower and is generally not more than 200m/s, and the productivity is greatly limited to be improved.
Disclosure of Invention
Based on this, the present invention aims to overcome the above-mentioned shortcomings of the prior art and provide a water transfer paper and a preparation method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the water transfer printing paper comprises a back coating layer, base paper, a bottom coating layer and a top coating layer which are distributed layer by layer from bottom to top; the base paper is special base paper for water transfer printing with a pigment layer; the primary coating comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the primer coating comprises the following steps:
(1) Uniformly mixing water and potato modified starch, and adding an oxidant to obtain a mixed solution A;
(2) Stirring, heating and preserving heat the mixed solution A obtained in the step (1) to obtain a pasty coating B;
(3) Cooling the pasty coating B obtained in the step (2) for the first time, adding a surfactant, uniformly stirring, and cooling for the second time to obtain the primary coating;
(4) And (3) coating the base coating obtained in the step (3) on the surface of base paper to obtain the base coating.
The water transfer printing paper provided by the application is respectively a back coating layer, a base paper, a bottom coating layer and a top coating layer which are distributed layer by layer from bottom to top, and the physical properties of the bottom coating, the top coating and the back coating are greatly different, and the functions are different. The 3 coatings of the water transfer paper respectively exert different effects, and finally meet the performance requirements of the product. The three materials are not mixed and are not necessary. The application improves the paint formula and the coating process of each coating, solves the problems of short storage time of the paint and multiple machine feeding in the coating process, and has good coating effect and high product quality of the obtained water transfer printing paper.
Preferably, in the step (1), the mass ratio of water to potato modified starch is: water: potato modified starch = 10: (2-3), the mass of the oxidant is 0.1-2% of the absolute dry weight of the primary coating; in the step (2), the heating temperature is 80-90 ℃, and the heat preservation time is 25-35min; in the step (3), the temperature is reduced to 45-55 ℃ for the first time, the temperature is reduced to 25-35 ℃ for the second time, and the mass of the surfactant is 1-2% of the absolute dry weight of the priming paint; in the step (4), the coating mode is doctor blade or bar coating.
The application adds a surfactant into the primer formula and is a cationic surfactant. The primary coating starch system is negative, has higher viscosity and is in a colloid state. The starch molecules have a large number of negatively charged groups, and charge adsorption exists between the starch molecules and the cationic surfactant molecules. And both are macromolecules, and the steric hindrance effect exists after adsorption, so that the self-crosslinking effect between starch molecules can be effectively inhibited, and the effects of effectively inhibiting ageing of the coating, improving the stability of the coating and prolonging the service shelf life of the coating are achieved. So far, the industry has not seen such operation, nor has the industry seen similar practice in the published patent. At present, the industry aims at solving the problems of short shelf life and easy aging of the paint, and mainly has two solutions: firstly, the primer is subjected to high-temperature heat preservation, and a large amount of energy is consumed. Secondly, the solid content of the paint is reduced, and the purpose of reducing the viscosity of the paint is achieved. However, in order to achieve the desired effect, multiple on-machine coating operations are required to achieve the desired coating amount. The invention can be used for long-term storage of the paint at normal temperature only by one-time on-machine coating without high-temperature heat preservation, thereby avoiding energy waste.
Further preferably, in the step (3), the viscosity of the primer coating is 100-1000mpa.s when the temperature of the primer coating is reduced to 25-35 ℃; in the step (4), the coating amount of the base coat is controlled to be 5-7g/m 2 The thickness of the resulting undercoating was 6.+ -.2. Mu.m, without calendering or light pressing. The invention of the primer coating enables the viscosity of the coating to be proper, meets the requirement of high-speed coating on the performance of the coating, and can improve the coating speed.
Further preferably, in the primer coating, the potato modified starch is at least one of phosphate starch, sulfate starch, acetate starch, xanthate starch, carboxymethyl starch and hydroxyalkyl starch; the oxidant is at least one of hypohalite, peroxide, persulfate, dichromate, potassium permanganate and periodic acid; the surfactant is at least one of primary amine salt, secondary amine salt, tertiary amine salt and quaternary ammonium salt type cationic surfactant.
Preferably, the top coat comprises the following components: corn modified starch, a surfactant, a leveling agent and water; the preparation method of the surface coating comprises the following steps:
(1) Uniformly mixing water and corn modified starch to obtain corn modified starch mixed solution;
(2) Stirring, heating and preserving heat the corn modified starch mixed solution obtained in the step (1) to obtain a pasty coating C;
(3) Cooling the pasty coating C obtained in the step (2), adding a surfactant and a leveling agent, and uniformly stirring to obtain the surface coating;
(4) And (3) coating the top coating obtained in the step (3) on the surface of the bottom coating to obtain the top coating.
Preferably, in the step (1), the mass ratio of water to corn modified starch is: water: corn modified starch = 10: (3-4); in the step (2), the heating temperature is 85-95 ℃, and the heat preservation time is 25-35min; in the step (3), the temperature is reduced to 25-35 ℃, the mass of the surfactant is 0.5-1% of the absolute dry weight of the surface coating, and the mass of the leveling agent is 1-2% of the absolute dry weight of the surface coating; in the step (4), the coating mode is curtain coating.
The curtain coating is an advanced coating mode, is non-contact coating, and avoids the defects that other coating modes cause direct contact between equipment and paper surface to cause scratches, roughness and the like to influence the service performance of the product. The non-contact coating method is suitable for high-speed coating. Other contact coating is required to reduce the speed of the vehicle and reduce paper defects in order to reduce scratches and roughness. The curtain coating mode is used for coating the surface coating, so that the curtain coating can be fully utilized, namely, the curtain coating can achieve high-precision coating, the coating amount can be precisely controlled, meanwhile, the smoothness of the curtain coating paper surface is high, the roughness is low, and the curtain coating paper surface has obvious advantages compared with other coating modes for downstream printing clients.
Further preferably, in the step (3), the viscosity of the top-coating paint is 30-100mpa.s when the temperature of the top-coating paint is reduced to 25-35 ℃; in the step (4), the coating amount of the top-coating layer is controlled to be 3-5g/m 2 The thickness of the resulting top coat was 4.+ -.2. Mu.m, without calendering.
Preferably, the corn modified starch is at least one of acid modified starch, cyclodextrin and maltodextrin; the surfactant is an anionic surfactant or a nonionic surfactant, and aims to reduce the surface tension of the surface coating. The surface coating is a micromolecular anionic system, has low viscosity and is in a solution state, and if a cationic surfactant is added, the coating is flocculated into clusters due to charge adsorption, so that an anionic surfactant or a nonionic surfactant is required to be selected; the leveling agent is at least one of organic silicon, acrylic ester and polyurethane.
Preferably, the back-coating comprises the following components: corn modified starch and water; the preparation method of the back coating comprises the following steps:
(1) Uniformly mixing water and corn modified starch to obtain corn modified starch mixed solution;
(2) Stirring, heating and preserving heat the corn modified starch mixed solution obtained in the step (1) to obtain a pasty coating D;
(3) Cooling the pasty coating D obtained in the step (2) to obtain the back coating;
(4) And (3) coating the back coating obtained in the step (3) on the back of the base paper to obtain the back coating.
Preferably, in the step (1), the mass ratio of water to corn modified starch is: water: corn modified starch = 10: (1-2); in the step (2), the heating temperature is 90-100 ℃, and the heat preservation time is 25-35min; in the step (3), the temperature is reduced to 25-35 ℃; in the step (4), the coating mode is roll coating.
Further preferably, in the step (3), the viscosity of the top-coating paint is 0 to 20mpa.s when the temperature of the top-coating paint is reduced to 25 to 35 ℃; in the step (4), the coating amount of the back coating is controlled to be 1-2g/m 2 And not calendaring.
Preferably, the corn modified starch is oxidized starch or enzymatically converted starch.
Compared with the prior art, the invention has the beneficial effects that: the invention can effectively solve the problems of short storage and quality guarantee period and multiple machine-on in the coating process (only one machine-on is needed) in the preparation process of the primer coating; secondly, the coating production speed can be improved, and the production speed is improved to 500m/s from the average industry level of not more than 200m/s, so that the production efficiency is greatly improved, and the production cost is reduced. Thirdly, the invention adopts an advanced coating mode, and the surface coating adopts a curtain coating mode, thereby improving the coating effect, reducing the roughness of paper surface, improving the printing effect and improving the product quality.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
The components and weight part selections of the specific examples 1-5 are shown in the table 1 and the table 2, wherein the mass of the oxidant, the surfactant and the leveling agent is the percentage of the absolute amount of the corresponding coating, and the products used in the application are all commercial products unless specified:
table 1 selection of parts by weight for examples 1-5
TABLE 2 selection of Components from examples 1-5
Examples after the components of the water transfer paper according to the examples of the present application are weighed according to tables 1 and 2, the water transfer paper according to the examples is respectively a back coating layer, a base paper, a base coating layer and a top coating layer which are distributed layer by layer from bottom to top; the primary coating comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the primer coating comprises the following steps:
(1) Uniformly mixing water and potato modified starch, and adding an oxidant to obtain a mixed solution A;
(2) Stirring, heating and preserving heat of the mixed solution A obtained in the step (1), wherein the heating temperature is 85 ℃, and the preserving heat time is 30min, so as to obtain pasty coating B;
(3) The pasty coating B obtained in the step (2) is subjected to first cooling to 50 ℃, a surfactant is added, uniformly stirred, and subjected to second cooling to 30 ℃ to obtain the primary coating;
(4) Coating the base coating obtained in the step (3) on the surface of base paper, wherein the coating amount of the base coating is controlled to be 6g/m 2 And obtaining the primer coating.
The preparation method of the surface coating comprises the following steps:
(1) Uniformly mixing water and corn modified starch to obtain corn modified starch mixed solution;
(2) Stirring, heating and preserving heat of the corn modified starch mixed solution obtained in the step (1), wherein the heating temperature is 90 ℃, and the preserving heat time is 30min, so as to obtain pasty coating C;
(3) Cooling the pasty coating C obtained in the step (2) to 30 ℃, adding a surfactant and a leveling agent, and uniformly stirring to obtain the surface coating;
(4) Coating the top coating obtained in the step (3) on the surface of the bottom coating in a curtain coating mode, wherein the coating amount of the top coating is controlled to be 4g/m 2 And obtaining the surface coating.
The preparation method of the back coating comprises the following steps:
(1) Uniformly mixing water and corn modified starch to obtain corn modified starch mixed solution;
(2) Stirring, heating and preserving heat of the corn modified starch mixed solution obtained in the step (1), wherein the heating temperature is 95 ℃, and the preserving heat time is 30min, so as to obtain pasty coating D;
(3) Cooling the pasty coating D obtained in the step (2) to 30 ℃ to obtain the back coating;
(4) Coating the back coating obtained in the step (3) on the back surface of the base paper, wherein the coating amount of the back coating is controlled to be 2g/m 2 And obtaining the back coating.
Comparative example
Comparative examples are set forth herein, with specific comparative examples set forth below:
comparative example 1 was identical to the rest of the components and preparation method of example 3, except that the primer coating contained no surfactant; comparative example 2 is identical to the rest of the components and preparation method of example 3, except that the top coat contains no surfactant; comparative example 3 is identical to the rest of the components and preparation method of example 3, except that the top coating contains no leveling agent.
Effect verification
Test standard: the viscosity of the primer coating is detected by a rotary viscometer, and the detection temperature of the coating is controlled at 30 ℃. The surface tension of the surface coating is detected by a surface tension meter, and the detection temperature of the coating is controlled at 30 ℃. The primer coating amount is detected by a quantitative method, and the top coating amount is a theoretical calculated value. Visual evaluation is adopted for surface coating leveling, the leveling is good, the coating is uniform, and obvious streaks appear on the curtain with poor leveling.
The testing process comprises the following steps: after the paint is prepared, the temperature is adjusted to 30 ℃, the viscosity of the primer paint is detected by adopting a rotary viscometer, and the surface tension of the surface paint is detected by adopting a surface tension meter. The base coat coating amount is calculated by subtracting the base paper banner quantitative average value from the base coated paper banner quantitative average value. The coating quantity of the surface coating adopts the data of the solid content, flow, speed and breadth of the coating, and the accurate theoretical value is calculated. Because curtain coating paint has no back flow, the paint is left on the paper surface, so that an accurate theoretical value can be calculated. The leveling property of the surface coating is visually evaluated by naked eyes.
Table 3 performance testing of examples and comparative examples
As is clear from Table 3, the primer coating of comparative example 1 was aged rapidly, and the viscosity increased to 5000 Pa.s or more in a short period of time, and scratches were easily generated by the application with a doctor blade or a bar. In order to control scratches, a thinner-grain scraping rod is required to be replaced or water is added to dilute the paint, so that the viscosity of the paint is reduced, and the coating amount is difficult to reach the set value of 6g/m 2 The primer coating process cannot be completed normally by the standard. The base coating materials of examples 1 to 5 have a viscosity of 100 to 1000mPa.s within one week, and can be normally and stably operated by a doctor blade or a bar coating method, and the coating amount reaches a set standard.
As can be seen from Table 3, the surface tension of the top coating paint of comparative example 2 was too high, the paint could not be stabilized as a curtain by curtain coating, shrinkage occurred in the middle of both ends, the paint could not be uniformly and stably coated on the entire banner of the paper, and the normal coating production process of the top coating could not be completed. The surface tension of the top coating of examples 1-5 is suitable, the formed curtain is uniform and stable, and the requirements of the curtain type coating stable production process are met.
As can be seen from Table 3, the top coating of comparative example 3 had poor leveling, obvious streaks on the curtain, uneven coating of the paper banner, and regular thick lines, and failed product. The top coating of examples 1-5 has good leveling property, and the resulting curtain is stable and uniform and has no streak. The paper banner is uniformly coated, and the coating amount can be accurately controlled.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. The water transfer printing paper is characterized by comprising a back coating layer, base paper, a bottom coating layer and a top coating layer which are distributed layer by layer from bottom to top; the base paper is special base paper for water transfer printing with a pigment layer; the primary coating comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the primer coating comprises the following steps:
(1) Uniformly mixing water and potato modified starch, and adding an oxidant to obtain a mixed solution A;
(2) Stirring, heating and preserving heat the mixed solution A obtained in the step (1) to obtain a pasty coating B;
(3) Cooling the pasty coating B obtained in the step (2) for the first time, adding a surfactant, uniformly stirring, and cooling for the second time to obtain the primary coating;
(4) Coating the base coating obtained in the step (3) on the surface of base paper to obtain the base coating;
in the step (1), the mass ratio of water to potato modified starch is as follows: water: potato modified starch = 10: (2-3), the mass of the oxidant is 0.1-2% of the absolute dry weight of the primary coating; in the step (2), the heating temperature is 80-90 ℃, and the heat preservation time is 25-35min; in the step (3), the temperature is reduced to 45-55 ℃ for the first time, the temperature is reduced to 25-35 ℃ for the second time, and the mass of the surfactant is 1-2% of the absolute dry weight of the priming paint; in the step (4), the coating mode is doctor blade or bar coating;
in the primary coating, the potato modified starch is at least one of phosphate starch, sulfate starch, acetate starch, xanthate starch, carboxymethyl starch and hydroxyalkyl starch; the oxidant is at least one of hypohalite, peroxide, persulfate, dichromate, potassium permanganate and periodic acid; the surfactant is any one of diester quaternary ammonium salt SL-8011, tertiary amine salt DMA1270, polyquaternary ammonium salt-55, primary amine salt-rosin ammonium and dodecyl methylene di-secondary ammonium salt;
the top coat comprises the following components: corn modified starch, a surfactant, a leveling agent and water; the corn modified starch is at least one of acid modified starch, cyclodextrin and maltodextrin; the surfactant is an anionic surfactant or a nonionic surfactant, and the leveling agent is at least one of organic silicon, acrylic ester and polyurethane.
2. The water transfer paper of claim 1, wherein the method of preparing the topcoat comprises the steps of:
(1) Uniformly mixing water and corn modified starch to obtain corn modified starch mixed solution;
(2) Stirring, heating and preserving heat the corn modified starch mixed solution obtained in the step (1) to obtain a pasty coating C;
(3) Cooling the pasty coating C obtained in the step (2), adding a surfactant and a leveling agent, and uniformly stirring to obtain the surface coating;
(4) And (3) coating the top coating obtained in the step (3) on the surface of the bottom coating to obtain the top coating.
3. The water transfer paper according to claim 2, wherein in the preparation method of the top coating layer, in the step (1), the mass ratio of water to corn modified starch is: water: corn modified starch = 10: (3-4); in the step (2), the heating temperature is 85-95 ℃, and the heat preservation time is 25-35min; in the step (3), the temperature is reduced to 25-35 ℃, the mass of the surfactant is 0.5-1% of the absolute dry weight of the surface coating, and the mass of the leveling agent is 1-2% of the absolute dry weight of the surface coating; in the step (4), the coating mode is curtain coating.
4. The water transfer paper of claim 1, wherein the back coating comprises the following components: corn modified starch and water; the preparation method of the back coating comprises the following steps:
(1) Uniformly mixing water and corn modified starch to obtain corn modified starch mixed solution;
(2) Stirring, heating and preserving heat the corn modified starch mixed solution obtained in the step (1) to obtain a pasty coating D;
(3) Cooling the pasty coating D obtained in the step (2) to obtain the back coating;
(4) And (3) coating the back coating obtained in the step (3) on the back of the base paper to obtain the back coating.
5. The water transfer paper according to claim 4, wherein in the preparation method of the back coating layer, in the step (1), the mass ratio of water to corn modified starch is: water: corn modified starch = 10: (1-2); in the step (2), the heating temperature is 90-100 ℃, and the heat preservation time is 25-35min; in the step (3), the temperature is reduced to 25-35 ℃; in the step (4), the coating mode is roll coating.
6. The water transfer paper of claim 5, wherein the corn-modified starch is oxidized starch or enzymatically converted starch.
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