CN112962350A - Water transfer printing paper and preparation method thereof - Google Patents
Water transfer printing paper and preparation method thereof Download PDFInfo
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- CN112962350A CN112962350A CN202110170180.8A CN202110170180A CN112962350A CN 112962350 A CN112962350 A CN 112962350A CN 202110170180 A CN202110170180 A CN 202110170180A CN 112962350 A CN112962350 A CN 112962350A
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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
-
- 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 printing paper, and relates to the technical field of special paper. The water transfer printing paper comprises a back coating layer, a base paper, a bottom coating layer and a surface 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 base coat comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the base coat comprises the following steps: (1) uniformly mixing water and the potato modified starch, and adding an oxidant to obtain a mixed solution A; (2) stirring, heating and preserving heat for the mixed solution A obtained in the step (1) to obtain pasty paint 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 base coating; (4) and (4) coating the base coat obtained in the step (3) on the surface of the base paper pigment layer to obtain the base coat.
Description
Technical Field
The invention relates to the technical field of special paper, in particular to water transfer printing paper and a preparation method thereof.
Background
The water transfer paper as the carrier of transfer pattern consists of three layers, including lower base paper layer, middle adhesive layer and surface hydrosol layer. The principle of the water mark transfer printing technology is that after color pictures and texts are printed on water transfer printing paper, the paper is horizontally conveyed to the surface of water, the water sol layer is automatically dissolved in the water by the action of water pressure, and the base paper is drawn out. Finally, the color grain pattern is evenly transferred on the surface of the product, and after being cleaned and dried, a transparent protective coating is coated on the product. The surface of the product forms a three-dimensional simulation image-text, so that the product presents a distinct three-dimensional visual effect.
However, the existing water transfer paper production technology has some defects which are troubling the development of the industry for many years. The film-forming adhesive layer coating has the defect of short storage period after preparation, and two main solutions for the problem of short storage time in the industry at present are provided: firstly, adding a heat preservation tank after the preparation of the coating is finished, and preserving the heat at a temperature of more than 85 ℃; and secondly, reducing the solid content of the prepared coating to achieve the aim of reducing the viscosity of the coating, and adopting multiple-time machine coating to ensure that the coating weight meets the requirement. Both of these solutions have obvious disadvantages, i.e. the first solution causes increased equipment investment, the equipment is idle during the period of production change, and the energy consumption is increased. Scheme two increases manufacturing cost, reduces efficiency. In addition, the traditional water transfer printing paper is mostly produced by adopting a scraper or a bar coating mode, so that the paper surface has scratches, the roughness is large, and the printing is not favorable. Thirdly, the conventional water transfer paper is produced by adopting a small coating machine, the speed is slow and generally does not exceed 200m/s, and the improvement of the productivity is greatly limited.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide the water transfer printing paper and the preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a water transfer paper comprises a back coating, a base paper, a bottom coating and a surface 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 base coat comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the base coat comprises the following steps:
(1) uniformly mixing water and the potato modified starch, and adding an oxidant to obtain a mixed solution A;
(2) stirring, heating and preserving heat for the mixed solution A obtained in the step (1) to obtain pasty paint 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 base coating;
(4) and (4) 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 provided with a back coating layer, a base paper, a primary coating layer and a surface coating layer which are distributed layer by layer from bottom to top, and the primary coating layer, the surface coating layer and the back coating layer are different in physical property and have different functions. 3 coatings of the water transfer paper respectively exert different effects, and finally the product performance requirements are met. The three components can not be mixed, but only one of them can not be mixed. The application improves the paint formula and the coating process of each coating, solves the problems of short storage time of the paint and repeated operation in the coating process, and obtains the water transfer paper with good coating effect and high product quality.
Preferably, in the step (1), the mass ratio of the water to the potato modified starch is as follows: water: potato modified starch 10: (2-3), wherein the mass of the oxidant is 0.1-2% of the absolute dry weight of the base coating; in the step (2), the heating temperature is 80-90 ℃, and the heat preservation time is 25-35 min; 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 base coat; in the step (4), the coating mode is scraper or bar coating.
According to the application, a surfactant, namely a cationic surfactant, is added into a base coat formula. The starch system of the prime coating is negative, has higher viscosity and is in a colloid state. 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 the starch and the water soluble polymer are macromolecules, and a steric hindrance effect exists after adsorption, so that the self-crosslinking effect among starch molecules can be effectively inhibited, and the effects of effectively inhibiting the paint aging, improving the paint stability and prolonging the service life of the paint are achieved. So far, the operation is not seen in the industry, and the similar operation is not seen in the published patent. In order to solve the problem of short shelf life and easy aging of the coating in the prior industry, two main solutions are provided: firstly, the primer keeps warm at high temperature, and consumes a large amount of energy. Secondly, the solid content of the coating is reduced, and the aim of reducing the viscosity of the coating is achieved. However, in order to achieve the required effect, the required coating amount can be achieved by multiple machine coating. The invention is invented by only one-time coating on a machine, the coating can be stored for a long time at normal temperature without high-temperature heat preservation, and energy waste is avoided.
Further preferably, in the step (3), the viscosity of the primer coating when the temperature is reduced to 25-35 ℃ is 100-1000 mPa.s; in the step (4), the coating weight of the primary coating is controlled to be 5-7g/m2The thickness of the obtained base coat is 6 +/-2 mu m without calendering or light pressing. The primer coating creatively invented by the application enables the viscosity of the coating to be appropriate, meets the requirements of high-speed coating on the performance of the coating, and can improve the coating speed.
Further preferably, in the base 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 a corn modified starch mixed solution;
(2) stirring, heating and preserving heat for the corn modified starch mixed solution obtained in the step (1) to obtain a pasty coating C;
(3) cooling the pasty paint C obtained in the step (2), adding a surfactant and a flatting agent, and uniformly stirring to obtain the surface coating paint;
(4) and (4) coating the surface coating obtained in the step (3) on the surface of the base coating to obtain the surface coating.
Preferably, in the step (1), the mass ratio of the water to the corn modified starch is as follows: water: corn modified starch 10: (3-4); in the step (2), the heating temperature is 85-95 ℃, and the heat preservation time is 25-35 min; in the step (3), the temperature is reduced to 25-35 ℃, the mass of the surfactant is 0.5-1% of the oven dry weight of the surface coating, and the mass of the leveling agent is 1-2% of the oven dry weight of the surface coating; in the step (4), the coating method is curtain coating.
The curtain coating adopted in the surface coating is an advanced coating mode, is non-contact coating, and avoids the defects that equipment and paper surface are directly contacted to cause scratches, roughness and the like to influence the service performance of a product due to other coating modes. The non-contact coating method is suitable for high-speed coating. Other contact coating needs to be run at a reduced speed to reduce scratches and roughness and to alleviate defects of paper defects. The curtain coating mode is used for coating the surface coating, the curtain coating mode can be fully utilized, the curtain coating mode can achieve high-precision coating, the coating amount can be accurately controlled, meanwhile, the curtain coating paper surface is high in smoothness and low in roughness, and the curtain coating mode has obvious advantages compared with other coating modes for downstream printing clients.
Further preferably, in the step (3), the viscosity of the surface coating material when the temperature is reduced to 25-35 ℃ is 30-100 mPa.s; in the step (4), the coating weight of the surface coating is controlled to be 3-5g/m2The 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 and agglomerated due to charge adsorption, so that the anionic surfactant or the nonionic surfactant is required to be selected; the flatting agent is at least one of organic silicon, acrylate 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 a corn modified starch mixed solution;
(2) stirring, heating and preserving heat for 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 (4) 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 the water to the corn modified starch is as follows: water: corn modified starch 10: (1-2); in the step (2), the heating temperature is 90-100 ℃, and the heat preservation time is 25-35 min; in the step (3), the temperature is reduced to 25-35 ℃; in the step (4), the coating manner is roll coating.
Further preferably, in the step (3), the viscosity of the surface coating material when the temperature is reduced to 25-35 ℃ is 0-20 mPa.s; in the step (4), the coating weight of the back coating is controlled to be 1-2g/m2And not calendering.
Preferably, the corn modified starch is an oxidized starch or an 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 operation in the coating process (only one operation is needed) in the preparation process of the base coating; and secondly, the coating production speed can be increased from the industry average level of not more than 200m/s to 500m/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 the paper surface, improving the printing effect and improving the product quality.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
The components and parts by weight of the following specific examples 1 to 5 are selected as shown in tables 1 and 2, wherein the mass of the oxidizing agent, the surfactant and the leveling agent is the percentage content of the absolute dry weight of the corresponding coating, and the products used in the present application are all commercially available products unless otherwise specified:
TABLE 1 selection of parts by weight of examples 1-5
TABLE 2 selection of Components for examples 1-5
The water transfer printing paper comprises a back coating, base paper, a bottom coating and a top coating which are distributed layer by layer from bottom to top after the components of the water transfer printing paper are weighed according to the components in the following tables 1 and 2; the base coat comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the base coat comprises the following steps:
(1) uniformly mixing water and the potato modified starch, and adding an oxidant to obtain a mixed solution A;
(2) stirring, heating and preserving heat for 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 a pasty coating B;
(3) cooling the pasty coating B obtained in the step (2) for the first time to 50 ℃, adding a surfactant, uniformly stirring, cooling for the second time to 30 ℃ to obtain the base coating;
(4) coating the base coat obtained in the step (3) on the surface of base paper, wherein the coating weight of the base coat is controlled at 6g/m2And obtaining the base coating.
The preparation method of the surface coating comprises the following steps:
(1) uniformly mixing water and corn modified starch to obtain a corn modified starch mixed solution;
(2) stirring, heating and preserving heat for 30min by the corn modified starch mixed solution obtained in the step (1), wherein the heating temperature is 90 ℃, and the preserving heat time is 30min to obtain pasty paint C;
(3) cooling the pasty paint C obtained in the step (2) to 30 ℃, adding a surfactant and a flatting agent, and uniformly stirring to obtain the surface coating paint;
(4) coating the surface coating obtained in the step (3) on the surface of a primary coating in a curtain coating mode, wherein the coating amount of the surface coating is controlled to be 4g/m2And 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 a corn modified starch mixed solution;
(2) stirring, heating and preserving heat for 30min by the corn modified starch mixed solution obtained in the step (1), wherein the heating temperature is 95 ℃, and the preserving heat time is 30min to obtain a 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 of the base paper, and controlling the coating weight of the back coating to be 2g/m2And obtaining the back coating.
Comparative example
The application sets up the comparative example, and specific comparative example sets up as follows:
the rest components and the preparation method of the comparative example 1 are completely the same as those of the example 3, and only the priming coating does not contain a surfactant; comparative example 2 is identical to example 3 in the rest components and preparation method, and only the surface coating does not contain a surfactant; comparative example 3 is identical to example 3 in the rest components and preparation method, and only the top coating layer does not contain the leveling agent.
Effect verification
And (4) testing standard: the viscosity of the priming paint is detected by a rotary viscometer, and the paint detection temperature 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 coating weight of the base coat is detected by a quantitative method, and the coating weight of the surface coat is a theoretical calculated value. The leveling property of the surface coating is visually evaluated by naked eyes, the coating with good leveling property is uniform in curtain forming, and obvious streaks appear on the curtain with poor leveling property.
The testing process comprises the following steps: after the preparation of the coating, the temperature is adjusted to 30 ℃, the viscosity of the primary coating is detected by a rotary viscometer, and the surface tension of the surface coating is detected by a surface tension meter. The base coat coating weight is calculated by subtracting the base paper banner quantitative average value from the base coat coated paper banner quantitative average value. And the surface coating weight adopts the data of solid content, flow, vehicle speed and width of the coating to calculate out an accurate theoretical value. Since the curtain coating does not reflow and the coating remains entirely on the paper, an accurate theoretical value can be calculated. The surface coating leveling property is visually evaluated by naked eyes.
TABLE 3 Performance testing of examples and comparative examples
As is clear from Table 3, the undercoat paint of comparative example 1 aged rapidly, increased in viscosity to 5000mPa.s or more in a short time, and was easily scratched by coating with a blade or bar. In order to control the scratch, a scratch bar with finer lines needs to be replaced or water needs to be added to dilute the coating, the viscosity of the coating is reduced, and the coating weight is difficult to reach the set 6g/m2Under standard, the primer coating process cannot be completed normally. The viscosity of the base coating of the embodiments 1-5 is kept at 1000mPa.s of 100-.
As can be seen from Table 3, in comparative example 2, the surface tension of the top coating is too high, the top coating cannot be stably formed into a curtain by adopting a curtain coating mode, the two ends of the top coating shrink towards the middle, the top coating cannot be uniformly and stably coated on the whole banner of the paper surface, and the normal coating production process of the top coating cannot be completed. The surface coating materials of the examples 1 to 5 have proper surface tension and uniform and stable curtain formation, and meet the requirements of stable production process of curtain coating.
As can be seen from Table 3, the coating of comparative example 3 has poor leveling property, obvious streaks appear on the curtain, uneven coating of the banner of the coated paper surface and regular thick material lines, and the product is unqualified. The top coats of examples 1-5 had good leveling, stable and uniform curtain formation, and no streaks. The paper surface banner has even coating and the coating amount can be accurately controlled.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The water transfer printing paper is characterized in that a back coating, a base paper, a bottom coating and a surface coating which are distributed layer by layer from bottom to top are respectively provided; the base paper is special base paper for water transfer printing with a pigment layer; the base coat comprises the following components: potato modified starch, an oxidant, a surfactant and water; the preparation method of the base coat comprises the following steps:
(1) uniformly mixing water and the potato modified starch, and adding an oxidant to obtain a mixed solution A;
(2) stirring, heating and preserving heat for the mixed solution A obtained in the step (1) to obtain pasty paint 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 base coating;
(4) and (4) coating the base coating obtained in the step (3) on the surface of base paper to obtain the base coating.
2. The water transfer paper of claim 1, wherein in step (1), the mass ratio of water to potato modified starch is: water: potato modified starch 10: (2-3), wherein the mass of the oxidant is 0.1-2% of the absolute dry weight of the base coating; in the step (2), the heating temperature is 80-90 ℃, and the heat preservation time is 25-35 min; 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 base coat; in the step (4), the coating mode is scraper or bar coating.
3. The water transfer paper according to claim 1, wherein in the undercoat coating layer, the potato-modified starch is at least one of phosphate starch, sulfate starch, acetate starch, xanthate starch, carboxymethyl starch, 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.
4. The water transfer paper of claim 1, wherein the topcoat coating 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 a corn modified starch mixed solution;
(2) stirring, heating and preserving heat for the corn modified starch mixed solution obtained in the step (1) to obtain a pasty coating C;
(3) cooling the pasty paint C obtained in the step (2), adding a surfactant and a flatting agent, and uniformly stirring to obtain the surface coating paint;
(4) and (4) coating the surface coating obtained in the step (3) on the surface of the base coating to obtain the surface coating.
5. The water transfer paper of claim 4, wherein in 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 25-35 min; in the step (3), the temperature is reduced to 25-35 ℃, the mass of the surfactant is 0.5-1% of the oven dry weight of the surface coating, and the mass of the leveling agent is 1-2% of the oven dry weight of the surface coating; in the step (4), the coating method is curtain coating.
6. The water transfer paper of claim 4 or 5, wherein the corn modified starch is at least one of acid modified starch, cyclodextrin, maltodextrin; the surfactant is an anionic surfactant or a nonionic surfactant; the flatting agent is at least one of organic silicon, acrylate and polyurethane.
7. 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 a corn modified starch mixed solution;
(2) stirring, heating and preserving heat for 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 (4) coating the back coating obtained in the step (3) on the back of the base paper to obtain the back coating.
8. The water transfer paper of claim 6, wherein in 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 25-35 min; in the step (3), the temperature is reduced to 25-35 ℃; in the step (4), the coating manner is roll coating.
9. The water transfer paper of claim 7 or 8, wherein the corn modified starch is an oxidized starch or an enzymatically converted starch.
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| CN114875711A (en) * | 2022-05-17 | 2022-08-09 | 广东冠豪新材料研发有限公司 | Coating for preparing water transfer printing paper and preparation method of water transfer printing paper |
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