Heat transfer paper and preparation process thereof
By modifying the compound preparation of the glue solution, the composite of guar gum, nanosilica and sodium carboxymethylcellulose, the problem of easy scratching and low transfer rate of the thermal transfer paper is solved, and a thermal transfer paper with high transfer rate, moderate water absorption and fast drying speed is achieved.
Patent Information
- Application Number
- CN202510406763.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2025-06-10
AI Technical Summary
Existing thermal transfer papers have problems such as easy scratching of graphics and text information and low transfer rate.
By combining modified guar gum, nanosilica and sodium carboxymethylcellulose, thermal transfer paper with high transfer rate, moderate water absorption and fast drying speed were prepared.
It improves the transfer rate and mechanical properties of thermal transfer paper, reduces water absorption, and enhances surface smoothness and matttens strength.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of thermal transfer paper, and particularly relates to a thermal transfer paper and a preparation process thereof. Background Art
[0002] Compared with traditional printing and dyeing technologies, the thermal sublimation transfer technology has become one of the most popular printing technologies today due to its simple printing process, strong pattern layering on fabrics, bright colors, and no wastewater pollution. As an important intermediate carrier in the thermal sublimation transfer technology, thermal sublimation transfer paper has also received extensive attention. Currently, thermal sublimation transfer paper mainly relies on the paper surface coating to achieve a high transfer rate. Therefore, the optimization of the paper coating formula is one of the main research directions in this field. There are still problems such as easy scratching of graphic information and low transfer rate in thermal sublimation transfer paper on the market. Summary of the Invention
[0003] The purpose of the present invention is to provide a thermal transfer paper and a preparation process thereof, which have the effects of high transfer rate, moderate water absorption, and fast drying speed.
[0004] The above technical purpose of the present invention is achieved through the following technical solutions: A thermal transfer paper, the glue solution used for the thermal transfer paper is prepared by compounding modified guar gum, nano-silica, and sodium carboxymethyl cellulose.
[0005] A preparation process of a thermal transfer paper includes the following preparation steps:
[0006] S1: Preparation of modified paste: The modified paste is prepared by modified guar gum and nano-silica;
[0007] S2: Preparation of composite glue solution: It is prepared by adding sodium carboxymethyl cellulose to the modified paste in step S1;
[0008] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean plate, add an appropriate amount of the composite glue solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80°C after coating, take it out and cool it, and finally calender and flatten it at room temperature to obtain the thermal transfer paper.
[0009] The further setting of the present invention is that the modified guar gum is prepared by the following method: (1) Add guar gum powder to an ethanol aqueous solution, stir it in a high-speed stirrer to form a guar gum powder paste, wherein the concentration of the ethanol aqueous solution is 10%, and the mass-volume ratio of the guar gum powder to the ethanol aqueous solution is 1:7; Add the guar gum powder paste to a reaction kettle, place the reaction kettle in a constant temperature water bath at 90 - 95°C and heat for 2h, then take out the reactant. At this time, the guar gum powder paste forms a gel mass; Then enzymatically degrade the gel mass to make it into a guar gum hydrate.
[0010] By adopting the above technical solution, in the molecular structure of guar gum powder, a large number of hydroxyl groups are wrapped inside the molecule. Due to the intramolecular hydrogen bond effect, its water solubility is greatly reduced, it cannot swell rapidly, and the dissolution rate is slow. At the same time, guar gum powder also has disadvantages such as difficult viscosity control and easy decomposition by microorganisms. Therefore, it needs to be modified. The purpose of the degradation of guar gum in the present invention is to prepare a low-molecular-weight guar gum that can meet the requirements of fracturing. The degraded guar gum should have a certain molecular weight, its aqueous solution should have a certain viscosity and be able to crosslink into a gel. The low-molecular-weight guar gum fracturing fluid has long-term rheological stability and will not show the situation where the viscosity of the conventional fracturing fluid containing a breaker decreases with time.
[0011] The further setting of the present invention is: the method of enzymatic degradation is: heat the guar gum mass in a water bath to 45 - 55 °C, then take it out and put it into a high-speed blender. While stirring, add an appropriate amount of enzyme powder. After stirring evenly, carry out water bath heating again and stir at a low speed for 40 - 60 min. The heating temperature is 45 - 55 °C to obtain the degraded guar gum.
[0012] By adopting the above technical solution, if the molecular weight of guar gum is too small, it does not have enough hydrodynamic volume and cannot crosslink into a gel. Therefore, the degradation time is relatively important.
[0013] The further setting of the present invention is: the enzyme powder is β-mannanase.
[0014] The further setting of the present invention is: the addition amount of the enzyme powder is 0.1 - 0.12 g / L.
[0015] The further setting of the present invention is: the preparation method of the modified paste in step S1 is: fully mix the modified guar gum and nano-silica evenly, then add the mixture to the deionized water that is being stirred and stir for 30 - 60 min to obtain a uniformly stirred modified paste, where the mass ratio of the modified guar gum to nano-silica is 2:0.1, and the mass percentage of the mixture of the modified guar gum, nano-silica to deionized water is 6 - 10:100.
[0016] The further setting of the present invention is: the preparation method of the composite glue liquid in step S2 is: weigh a certain amount of cationic starch and modified paste, add water, heat up to 90 - 95 °C, fully gelatinize, then continue water bath heating for 40 - 50 min, then cool down to 50 °C, while stirring, add sodium carboxymethylcellulose, heat up to 55 - 60 °C to make it fully dissolve, continue to keep warm and stir for 40 - 50 min, and form a composite glue liquid after cooling and standing to defoam.
[0017] By adopting the above technical solution, cationic starch is combined with modified guar gum. By introducing cationic groups on the molecular chain of guar gum, a certain positive charge is obtained. At the same time, since the modified guar gum is degraded, its molecular chain is reduced, while the degree of polymerization of sodium carboxymethyl cellulose and cationic starch is relatively high, introducing longer molecular chains, and the cations between carboxyl groups increase, resulting in the intermolecular attraction of sodium carboxymethyl cellulose being greater than the free repulsive force, making it in an aggregated and folded state, with a reduced solubility in the sizing solution, less association with cationic starch, resulting in an increase in the viscosity of the sizing solution. At the same time, when using the composite sizing solution for coating, the gaps on the fiber surface are filled, making the paper surface smoother. This is because the association between the carboxyl groups in sodium carboxymethyl cellulose and cationic starch increases, and the electrostatic polymerization effect is enhanced, improving the compactness of the composite film, so the smoothness of the coated paper; after the sizing solution dries, a continuous, complete and flexible film is formed on the surface of the base paper, filling the voids between the fibers on the surface of the base paper, strengthening the bonding between the fibers, thus improving the surface linting strength. The carboxyl groups are associated with ammonium salts to form a stable network structure, enhancing the mechanical properties of the composite film; the carboxyl groups of MC are combined with CS, increasing the compactness and enhancing the barrier property of the film, so that it is difficult for external moisture to penetrate the film and combine with the fibers inside the paper, so the water absorbency value of the coated paper is slightly lower than that of the base paper.
[0018] A further setting of the present invention is that the mass fraction ratio of the modified sizing agent to sodium carboxymethyl cellulose is 4:1.
[0019] A further setting of the present invention is that the mass fraction ratio of the cationic starch to the sodium carboxymethyl cellulose is 1:4 - 5.
[0020] The beneficial effects of the present invention are:
[0021] 1. In the molecular structure of guar gum powder, a large number of hydroxyl groups are wrapped inside the molecule. Due to the intramolecular hydrogen bond effect, its water solubility is greatly reduced, it cannot swell quickly, and the dissolution rate is slow. At the same time, guar gum powder also has disadvantages such as difficult viscosity control and easy decomposition by microorganisms. Therefore, it needs to be modified. The purpose of degrading guar gum in the present invention is to prepare a low-molecular-weight guar gum that can meet the requirements of fracturing. The degraded guar gum should have a certain molecular weight, its aqueous solution should have a certain viscosity and be able to crosslink into a gel, and the low-molecular-weight guar gum fracturing fluid has long-term rheological stability.
[0022] 2. Cationic starch combines with modified guar gum. By introducing cationic groups onto the molecular chain of guar gum, a certain positive charge is obtained. At the same time, since the modified guar gum is degraded, its molecular chain shortens. While the degree of polymerization of sodium carboxymethyl cellulose and cationic starch is relatively high, introducing longer molecular chains, and the cations between carboxyl groups increase, resulting in the attraction between sodium carboxymethyl cellulose molecules being greater than the free repulsive force, causing it to be in an aggregated and folded state, with a reduced solubility in the glue solution and a decreased association with cationic starch, leading to an increase in the viscosity of the glue solution. At the same time, when using the composite glue solution for coating, it fills the gaps on the fiber surface, making the paper surface smoother. This is because the association between the carboxyl groups in sodium carboxymethyl cellulose and cationic starch increases, and the electrostatic polymerization effect is enhanced, improving the compactness of the composite film, so the smoothness of the coated paper; after the glue solution dries, a continuous, complete and flexible film is formed on the surface of the base paper, filling the voids between the fibers on the surface of the base paper, strengthening the bond between the fibers, thus improving the surface linting strength. The carboxyl groups associate with ammonium salts to form a stable network structure, enhancing the mechanical properties of the composite film; the carboxyl groups of MC combine with CS, increasing the compactness and enhancing the barrier properties of the film, making it difficult for external moisture to penetrate the film and combine with the fibers inside the paper. Therefore, the water absorbency value of the coated paper is slightly lower than that of the base paper. Detailed implementation manners
[0023] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0024] Example 1, A preparation process of a thermal transfer paper, including the following preparation steps:
[0025] S1: Preparation of modified paste: Thoroughly mix 20 g of modified guar gum and 3 g of nano-silica, and then add the mixture to 200 mL of deionized water being stirred and stir for 30 - 60 min to obtain a uniformly stirred modified paste;
[0026] S2: Preparation of composite glue solution: Weigh 100 g of cationic starch and 60 g of modified paste, add water, heat to 90 - 95 °C, fully gelatinize, then continue water bath heating for 40 - 50 min, then cool to 50 °C, add 40 g of sodium carboxymethyl cellulose while stirring, heat to 55 - 60 °C to make it fully dissolve, continue to keep warm and stir for 40 - 50 min, and cool and then stand to defoam to form a composite glue solution;
[0027] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite adhesive solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and cool it, and finally calender and flatten it at room temperature to obtain the thermal transfer paper.
[0028] Example 2, A preparation process of thermal transfer paper, including the following preparation steps:
[0029] S1: Preparation of modified paste: Thoroughly mix 50 g of modified guar gum and 3 g of nano-silica, then add the mixture to 200 mL of deionized water that is being stirred and stir for 30 - 60 min to obtain a uniformly stirred modified paste;
[0030] S2: Preparation of composite adhesive solution: Weigh 100 g of cationic starch and 60 g of modified paste, add water, heat up to 90 - 95 °C, after thorough gelatinization, continue water bath heating for 40 - 50 min, then cool down to 50 °C, add 40 g of sodium carboxymethylcellulose while stirring, heat up to 55 - 60 °C to make it fully dissolve, continue heat preservation and stirring for 40 - 50 min, and let it stand and defoam after cooling to form a composite adhesive solution;
[0031] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite adhesive solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and cool it, and finally calender and flatten it at room temperature to obtain the thermal transfer paper.
[0032] Example 3, A preparation process of thermal transfer paper, including the following preparation steps:
[0033] S1: Preparation of modified paste: Thoroughly mix 100 g of modified guar gum and 60 g of nano-silica, then add the mixture to deionized water that is being stirred and stir for 30 - 60 min to obtain a uniformly stirred modified paste,
[0034] S2: Preparation of composite adhesive solution: Weigh a certain amount of 100 g of cationic starch and 60 g of modified paste, add water, heat up to 90 - 95 °C, after thorough gelatinization, continue water bath heating for 40 - 50 min, then cool down to 50 °C, add 40 g of sodium carboxymethylcellulose while stirring, heat up to 55 - 60 °C to make it fully dissolve, continue heat preservation and stirring for 40 - 50 min, and let it stand and defoam after cooling to form a composite adhesive solution;
[0035] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite adhesive solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and cool it, and finally calender and flatten it at room temperature to obtain the thermal transfer paper.
[0036] Example 4. A preparation process of thermal transfer paper, comprising the following preparation steps:
[0037] S1: Preparation of modified paste: Thoroughly mix 60 g of modified guar gum and 3 g of nano-silica, and then add the mixture to deionized water under stirring. Stir for 30 - 60 min to obtain a uniformly stirred modified paste.
[0038] S2: Preparation of composite adhesive solution: Weigh 60 g of modified paste, add water, heat up to 90 - 95 °C, fully gelatinize, then continue water bath heating for 40 - 50 min, and then cool down to 50 °C. While stirring, add 40 g of sodium carboxymethyl cellulose, heat up to 55 - 60 °C to fully dissolve it, continue heat preservation and stirring for 40 - 50 min, and after cooling, let it stand for defoaming to form a composite adhesive solution.
[0039] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite adhesive solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and cool it, and finally calender and level it at room temperature to obtain the thermal transfer paper.
[0040] Example 5. A preparation process of thermal transfer paper, comprising the following preparation steps:
[0041] S1: Preparation of modified paste: Thoroughly mix 60 g of modified guar gum and 3 g of nano-silica, and then add the mixture to deionized water under stirring. Stir for 30 - 60 min to obtain a uniformly stirred modified paste.
[0042] S2: Preparation of composite adhesive solution: Weigh 150 g of cationic starch and 60 g of modified paste, add water, heat up to 90 - 95 °C, fully gelatinize, then continue water bath heating for 40 - 50 min, and then cool down to 50 °C. While stirring, add 40 g of sodium carboxymethyl cellulose, heat up to 55 - 60 °C to fully dissolve it, continue heat preservation and stirring for 40 - 50 min, and after cooling, let it stand for defoaming to form a composite adhesive solution.
[0043] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite adhesive solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and cool it, and finally calender and level it at room temperature to obtain the thermal transfer paper.
[0044] Example 6. A preparation process of thermal transfer paper, comprising the following preparation steps:
[0045] S1: Preparation of modified paste: Thoroughly mix 60 g of modified guar gum and 3 g of nano-silica, then add the mixture to the deionized water being stirred and continue stirring for 30 - 60 min to obtain a uniformly stirred modified paste;
[0046] S2: Preparation of sizing solution: Weigh 100 g of cationic starch and 60 g of modified paste, add water, heat up to 90 - 95 °C, after thorough gelatinization, continue water bath heating for 40 - 50 min, then cool down to 50 °C, keep stirring for 40 - 50 min while cooling, and let it stand for defoaming after cooling to form a composite sizing solution;
[0047] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean plate, add an appropriate amount of the composite sizing solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and let it cool, and finally calender and smooth it at room temperature to obtain the thermal transfer paper.
[0048] Example 7, A preparation process of thermal transfer paper, comprising the following preparation steps:
[0049] S1: Preparation of modified paste: Thoroughly mix 60 g of modified guar gum and 3 g of nano-silica, then add the mixture to the deionized water being stirred and continue stirring for 30 - 60 min to obtain a uniformly stirred modified paste;
[0050] S2: Preparation of composite sizing solution: Weigh 100 g of cationic starch and 60 g of modified paste, add water, heat up to 90 - 95 °C, after thorough gelatinization, continue water bath heating for 40 - 50 min, then cool down to 50 °C, add 80 g of sodium carboxymethyl cellulose while stirring, heat up to 55 - 60 °C to dissolve it thoroughly, continue heat preservation and stirring for 40 - 50 min, and let it stand for defoaming after cooling to form a composite sizing solution;
[0051] S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean plate, add an appropriate amount of the composite sizing solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and let it cool, and finally calender and smooth it at room temperature to obtain the thermal transfer paper.
[0052] Example 8, A preparation process of thermal transfer paper, comprising the following preparation steps:
[0053] S1: Preparation of composite sizing solution: Weigh 100 g of cationic starch, add water, heat up to 90 - 95 °C, after thorough gelatinization, continue water bath heating for 40 - 50 min, then cool down to 50 °C, add 40 g of sodium carboxymethyl cellulose while stirring, heat up to 55 - 60 °C to dissolve it thoroughly, continue heat preservation and stirring for 40 - 50 min, and let it stand for defoaming after cooling to form a composite sizing solution;
[0054] S2: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite adhesive solution at one end of the paper, coat it with a wire bar coater, dry it in an oven at 80 °C after coating, take it out and cool it, and finally calender and flatten it at room temperature to obtain the thermal transfer paper.
[0055] Viscosity analysis was performed on the adhesive solutions obtained in Examples 1-8 to obtain Table 1;
[0056] Paper surface strength tests (using the wax bar method), paper water absorption tests, and paper smoothness tests were performed on the thermal transfer papers obtained in Examples 1-8 to obtain Table 2.
[0057] The thermal transfer papers obtained in Examples 1-8 were used with a special inkjet printer to print the pre-prepared patterns onto the transfer paper. The transfer printer was turned on, and the fabric was closely attached to the transfer paper for transfer printing to obtain the transfer printed fabric. Measurement of the transfer rate and calculation of the fabric apparent depth value (K / S) were performed on the transfer printed fabrics obtained in Examples 1-8 to obtain Table 3.
[0058] Table 1 Viscosity test table of the adhesive solutions obtained in Examples 1-8
[0059]
[0060] As can be seen from Table 1, the viscosity of the adhesive solution obtained in Example 2 is more appropriate. Comparing Example 2 with Examples 4 and 5, it can be seen that as the amount of cationic starch increases to an excessive amount, the cationic starch in the adhesive solution becomes the main factor for increasing the viscosity of the adhesive solution, which will make its viscosity too high. The viscosity in Example 2 is more appropriate. This is because when sodium carboxymethyl cellulose is compounded with cationic starch, ionic association occurs between the carboxymethyl group and the ammonium salt, resulting in a decrease in the solute concentration in the adhesive solution. As the degree of substitution of sodium carboxymethyl cellulose gradually increases, the number of carboxyl groups increases, the distance between carboxyl groups becomes shorter, the repulsive force increases, the attractive force is less than the repulsive force, the molecular chain of sodium carboxymethyl cellulose stretches, increasing the negative charge density exposed by its molecules and the ionic binding ability, and the ammonium salt associated with it also increases accordingly, resulting in a significant decrease in the solute concentration, manifested as the viscosity of the adhesive solution being lower than when adding only cationic starch or sodium carboxymethyl cellulose.
[0061] Table 2 Paper property tests of the thermal transfer papers obtained in Examples 1-8
[0062]
[0063] As can be seen from Table 2, the comprehensive performance in Example 2 is the best, with a relatively high surface smoothness. When the association between the carboxyl groups on sodium carboxymethyl cellulose and cationic starch increases, its electrostatic polymerization effect will be enhanced, improving the compactness of the composite film. Secondly, after the sizing solution is coated, it will fill the gaps on the limiting surface, making the paper surface smoother, reducing its water absorption, and at the same time improving the surface strength.
[0064] Table 3 Performance analysis of the transfer printed fabrics obtained in Examples 1 - 8
[0065]
[0066] As can be seen from Table 3, the transfer rate and apparent depth value in Example 2 are relatively high. This is because the sizing solution prepared by the present invention has a barrier effect, which can block the ink on the paper surface as much as possible for the pigment particles on the film to absorb, so its transfer rate is the highest. Adding a certain amount of silica will improve the apparent color yield and transfer rate of the fabric, but excessive nano - silica will reduce the printing effect of the fabric.
Claims
1. A thermal transfer paper, characterized in that: The glue liquid used for the thermal transfer paper is prepared by compounding modified guar gum, nano silicon dioxide and sodium carboxymethyl cellulose.
2. A process for preparing thermal transfer paper according to claim 1, characterized in that: The method comprises the following preparation steps: S1: Preparation of modified paste: The modified paste was prepared by modifying guar gum and nano-silica; S2: Preparation of composite glue: prepared by adding sodium carboxymethyl cellulose to the modified paste in step S1; S3: Preparation of thermal transfer paper: Lay the thermal transfer base paper flat on a clean flat plate, add an appropriate amount of composite glue liquid to one end of the paper, apply it with a wire rod applicator, dry it in an oven at 80°C after coating, take it out to cool, and finally calender it at room temperature to obtain thermal transfer paper.
3. The process for preparing thermal transfer paper according to claim 2, characterized in that: The modified guar gum is prepared by the following method: (1) adding guar gum powder to an ethanol aqueous solution, stirring in a high-speed stirrer to form a guar gum powder paste, wherein the concentration of the ethanol aqueous solution is 10%, and the mass volume ratio of the guar gum powder to the ethanol aqueous solution is 1:7; adding the guar gum powder paste to a reactor, placing the reactor in a constant temperature water bath at 90-95° C. and heating for 2 hours, then taking out the reactants, at which time, the guar gum powder paste forms micelles; and then enzymatically degrading the micelles to form guar gum hydrates.
4. The process for preparing thermal transfer paper according to claim 3, characterized in that: The enzyme degradation method comprises the following steps: heating the guar gum micelles in a water bath to 45-55° C., taking them out and putting them into a high-speed mixer, adding a proper amount of enzyme powder while stirring, and heating them in a water bath again and stirring at a low speed for 40-60 minutes after stirring evenly, the heating temperature being 45-55° C., to obtain the degraded guar gum.
5. A process for preparing thermal transfer paper according to claim 4, characterized in that: The enzyme powder is β-mannanase.
6. The process for preparing thermal transfer paper according to claim 4, characterized in that: The enzyme powder is added in an amount of 0.1-0.12 g / L.
7. The process for preparing thermal transfer paper according to claim 2, characterized in that: The preparation method of the modified paste in step S1 is: fully and evenly mix the modified guar gum and nano-silicon dioxide, then add the mixture into the stirring deionized water and stir for 30-60 minutes to obtain the stirred modified paste, wherein the mass ratio of the modified guar gum and the nano-silicon dioxide is 2:0.1, and the mass percentage of the mixture of the modified guar gum and the nano-silicon dioxide to the deionized water is 6-10:
100.
8. The process for preparing thermal transfer paper according to claim 2, characterized in that: The preparation method of the composite glue solution in step S2 is as follows: weigh a certain amount of cationic starch and modified paste, add water, heat to 90-95°C, continue to heat in a water bath for 40-50 minutes after sufficient gelatinization, then cool to 50°C, add sodium carboxymethyl cellulose while stirring, heat to 55-60°C to fully dissolve it, continue to keep warm and stir for 40-50 minutes, and let stand to degas after cooling to form a composite glue solution.
9. The process for preparing thermal transfer paper according to claim 2, characterized in that: The mass fraction ratio of the modified paste to sodium carboxymethyl cellulose is 4:
1.
10. The process for preparing thermal transfer paper according to claim 8, characterized in that: The mass fraction ratio of the cationic starch to the sodium carboxymethyl cellulose is 1:4-5.