A single-sided water-based environmentally friendly heat transfer film and its preparation process

Abstract

The present application relates to the field of thermal transfer films, and more specifically, to a single-sided, water-based, environmentally friendly heat transfer film and its preparation process. The film comprises, from the upper surface to the lower surface, an ink-absorbing layer, a water-based release layer, and a base layer. The water-based release layer is obtained by curing a water-based release agent, which is composed of the following raw materials in weight percentage: modified water-based acrylate, deionized water, a crosslinking agent, a defoaming agent, and modified polyurethane; the modified water-based acrylate is made from alkenylsiloxane, hydrogenated polysiloxane, phenylhydroxyl reticulated silicone resin, an adhesive agent, a surfactant, and water; the adhesive agent is composed of one or more of paraffin wax emulsion, palm wax emulsion, and polytetrafluoroethylene emulsion. Through the above scheme, the resulting water-based release layer has stable adhesion to the base layer, and during thermal transfer, the ink-absorbing layer can quickly separate from the water-based release layer, thereby improving transfer efficiency and quality.

Description

Technical Field

[0001] The present application relates to the field of heat transfer films, and more specifically, to a single-sided water-based environmentally friendly heat transfer film and a preparation process thereof. Background Art

[0002] Common heat transfer films are made by the following steps: first, a pattern or text is pre-printed onto the heat transfer film, then hot melt adhesive powder is sprinkled on one side of the pattern or text, and the excess hot melt adhesive powder is shaken off. The film is then baked at high temperature to completely melt the hot melt adhesive powder and adhere to one side of the pattern or text. After solidification, an adhesive layer is formed to make the heat transfer film. When in use, the pattern or text on the base film is transferred to a substrate, such as clothing, through the action of heat and pressure. Due to the presence of the adhesive layer, the pattern or text can be stably adhered to the substrate. Since the pattern or text on the heat transfer film has rich layers, small color difference, and good reproducibility, it can achieve the effect required by the designer.

[0003] As a functional material widely used in clothing, accessories, and other fields, heat transfer film has experienced rapid development in recent years. Heat transfer film primarily consists of an ink-absorbing layer, a release layer, and a base layer. The release layer plays a key role in ensuring that the ink-absorbing layer and the pattern or text sprayed on it are smoothly transferred to the substrate during the heat transfer process. However, with growing market demand and technological advancements, existing heat transfer film technology still has some shortcomings and urgently needs to be improved to meet higher application requirements.

[0004] In the prior art, in order to achieve efficient transfer of heat transfer films, the methods commonly adopted include but are not limited to: (1) optimizing the selection of release layer materials, such as using different types of release agents to improve their peeling performance; (2) adjusting the thickness of the release layer to balance transfer efficiency and stability; (3) changing the surface treatment of the release layer, such as the coating method and curing conditions, to adjust its bonding strength with the ink-absorbing layer; and (4) improving the formulation of the ink-absorbing layer to enhance its tolerance and adhesion at high temperatures. Although these methods can solve the problem to a certain extent, they still face challenges in practical application.

[0005] While the above-mentioned methods have improved the transfer performance of heat transfer films to a certain extent, significant drawbacks remain. Especially when transferring large areas, the strong adhesion between the release layer and the ink-absorbing layer can make it difficult to separate the two layers, or even leave some ink-absorbing layer on the surface of the release layer after separation, severely impacting the final transfer quality. Furthermore, the transferred pattern or text often exhibits unevenness and incompleteness, reducing the overall aesthetics and practicality of the product. Therefore, developing a new, single-sided, water-based, environmentally friendly heat transfer film to address these issues has become a key research topic. Summary of the Invention

[0006] In order to improve the efficiency of thermal transfer and ensure the quality of the pattern after transfer, the present application provides a single-sided water-based environmentally friendly heat transfer film and its preparation process.

[0007] In the first aspect, the present application provides a single-sided water-based environmentally friendly heat transfer film, which comprises, from the upper surface to the lower surface, an ink-absorbing layer, a water-based release layer, and a base layer. The water-based release layer is obtained by curing a water-based release agent, and the water-based release agent is composed of the following raw materials in the following weight percentages:

[0008] 35-45 parts of modified water-based acrylate

[0009] 40-50 parts deionized water

[0010] 10-15 parts crosslinking agent

[0011] 1-1.5 parts defoaming agent

[0012] 5-10 parts of modified polyurethane;

[0013] The modified water-based acrylate is prepared from alkenylsiloxane, hydrogen-containing polysiloxane, phenylhydroxy network silicone resin, bonding aid, surfactant, initiator and water;

[0014] The bonding aid is composed of one or more of paraffin wax emulsion, palm wax emulsion and polytetrafluoroethylene emulsion.

[0015] By adopting this technical solution, the modified water-based acrylate exhibits excellent wetting and dispersibility and initial tack, enabling it to stably adhere to the substrate surface and form a uniform water-based release layer. The cured water-based release layer not only facilitates the rapid detachment of the ink-receptive layer during the thermal transfer process but also ensures its stable adhesion to the substrate surface, effectively avoiding uneven transfer and incomplete printing caused by residual ink-receptive layer. This significantly improves thermal transfer efficiency and results, enhancing the quality and aesthetics of the final product.

[0016] Specifically, alkenyl siloxane, hydrogen-containing polysiloxane, phenyl hydroxyl network silicone resin and bonding aid are compounded to play a synergistic role and further improve the effect of the ink-absorbing layer quickly separating from the water-based release layer during thermal transfer. At the same time, it can ensure that the water-based release layer formed after curing has stable adhesion to the base layer, avoiding the water-based release layer from separating from the base layer during thermal transfer, which affects the overall thermal transfer quality.

[0017] In addition, by compounding the alkenylsiloxane, hydrogenated polysiloxane, phenylhydroxy network silicone resin, adhesive additive, etc. of the present application, the water-based release agent obtained, after curing, is not only environmentally friendly, but also can ensure that its large-area ink-absorbing layer can be completely separated from the water-based release layer in a relatively short time and stably fixed on the substrate, avoiding the occurrence of defects and the like, thereby improving the quality of the pattern layer after thermal transfer, and at the same time ensuring the adhesion stability between the water-based release layer and the base layer, reducing the phenomenon of defects in the water-based release layer after thermal transfer.

[0018] Preferably, the bonding agent is composed of paraffin wax emulsion, palm wax emulsion, and polytetrafluoroethylene emulsion in a weight ratio of 1: (1-3): (1-4).

[0019] By adopting the above technical solution, the adhesive additive prepared by mixing paraffin wax emulsion, palm wax emulsion and polytetrafluoroethylene emulsion in a specific proportion can significantly improve the wettability and initial adhesion of the water-based release agent, so that the water-based release layer adheres more evenly to the surface of the base layer, ensuring that the ink-absorbing layer is quickly and completely separated from the water-based release layer during the thermal transfer process, effectively avoiding the problem of ink-absorbing layer residue, and improving transfer efficiency and transfer quality.

[0020] Preferably, the hydrogen-containing polysiloxane is hydrogen-terminated phenyl polysiloxane and / or fluorine-modified polysiloxane containing hydrogen fluorosilicone oil.

[0021] By adopting the above technical solution, hydrogen-terminated phenyl polysiloxane and / or fluorine-modified polysiloxane containing hydrogen fluorosilicone oil as the hydrogen-containing polysiloxane component can significantly improve the heat resistance and chemical stability of the water-based release agent, enhance its adhesion to the base layer, and ensure that the water-based release layer will not decompose or deteriorate during high-temperature baking, so that the ink-absorbing layer can be more stably separated from the water-based release layer during thermal transfer, reducing residue and improving transfer quality and efficiency.

[0022] Preferably, the hydrogen-containing polysiloxane is composed of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane hydrogen-containing fluorosilicone oil in a weight ratio of 1:(1-3).

[0023] By adopting the above technical solution, the hydrogen-containing polysiloxane is composed of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane hydrogen fluorosilicone oil in a weight ratio of 1:(1-3), which makes the water-based release agent have better wetting and dispersibility and initial tack, thereby more stably adhering to the substrate surface and forming a uniform water-based release layer after curing. This not only improves the peeling performance between the ink-absorbing layer and the water-based release layer, but also ensures that the ink-absorbing layer can be quickly and completely transferred to the substrate during the thermal transfer process, avoiding residue problems and significantly improving thermal transfer efficiency and transfer effect.

[0024] Preferably, the phenyl hydroxy network silicone resin is a methylphenyl silicone resin containing silanol groups.

[0025] By adopting the above technical solution, a methylphenyl silicone resin containing silanol groups as a phenyl hydroxyl network silicone resin can significantly improve the wettability and dispersibility of the water-based release agent, allowing the water-based release layer to adhere more evenly to the substrate. This not only improves the stability of the water-based release layer, but also strengthens the interfacial interaction between the ink-receptive layer and the water-based release layer, ensuring that the ink-receptive layer can be quickly and completely transferred to the substrate during the thermal transfer process, avoiding residue problems, thereby improving thermal transfer efficiency and the final transfer effect.

[0026] Preferably, the alkenylsiloxane is (acryloxymethyl)dimethylmethoxysilane and / or methacryloxypropyltris(trimethylsiloxy)silane.

[0027] By adopting the above technical solution, (acryloxymethyl)dimethylmethoxysilane and / or methacryloxypropyl tris(trimethylsiloxy)silane as alkenyl siloxanes, the wetting, dispersibility, and initial tack of the water-based release agent can be significantly improved, making the water-based release layer more uniform and stable on the substrate surface. This not only improves the peelability of the ink-absorbing layer during thermal transfer, but also ensures that the ink-absorbing layer adheres firmly to the substrate surface, avoiding residue problems, thereby effectively improving thermal transfer efficiency and transfer results.

[0028] Preferably, the cross-linking agent is one or more of diacetone acrylamide, adipic acid dihydrazide, and hexamethylenediamine.

[0029] By adopting the above technical solution, the crosslinking agent is selected from one or more of diacetone acrylamide, adipic acid dihydrazide, and hexamethylenediamine. These crosslinking agents can effectively promote the crosslinking reaction between the molecules of the water-based release agent, enhancing the mechanical strength and heat resistance of the water-based release layer. This not only improves the stability of the water-based release layer, but also ensures that the ink-absorbing layer can quickly detach from the water-based release layer during the thermal transfer process and stably adhere to the substrate surface, thereby improving thermal transfer efficiency and transfer results.

[0030] Preferably, the modified polyurethane is a waterborne polyurethane resin.

[0031] By adopting the above technical solution, the modified polyurethane uses a water-based polyurethane resin, which improves the stability of the water-based release agent, making it less likely to precipitate or delaminate during the coating process, ensuring the uniformity and consistency of the water-based release layer. This not only strengthens the bonding between the ink-receptive layer and the water-based release layer, but also enhances the clarity and adhesion of the pattern after thermal transfer, further improving the overall performance of the heat transfer film.

[0032] Preferably, the ink-absorbing layer is formed by coating ink-absorbing ink on the aqueous release layer and curing the ink-absorbing ink, and the ink-absorbing ink is composed of aqueous polyurethane resin, adsorption filler, diluent, stabilizer and curing agent.

[0033] By adopting the above technical solution, the ink-receptive layer is formed by applying an ink-receptive ink to a water-based release layer and then curing it. The ink-receptive ink comprises a water-based polyurethane resin, an adsorbent filler, a diluent, a stabilizer, and a curing agent. The water-based polyurethane resin, as the primary film-forming substance, possesses excellent adhesion and chemical resistance, ensuring a strong bond between the ink-receptive layer and the water-based release layer. The adsorbent filler enhances the ink-receptive layer's ink absorption and color retention, making the pattern or text clearer and more vivid during the transfer process. The diluent helps regulate the fluidity of the ink-receptive ink, making it easier to evenly apply to the water-based release layer. The stabilizer improves the stability of the ink-receptive ink, preventing deterioration during storage and use. The curing agent accelerates the curing process of the ink-receptive ink, improving production efficiency, while also ensuring the mechanical strength and durability of the ink-receptive layer. These components work together to ensure that the ink-receptive layer not only has excellent ink absorption properties but also quickly separates from the water-based release layer during the thermal transfer process, forming a stable and durable pattern or text on the substrate surface.

[0034] In a second aspect, a method for preparing a single-sided water-based environmentally friendly heat transfer film comprises the following steps:

[0035] Water-based release agent: Weigh the modified water-based acrylic resin and deionized water in parts by weight, mix them, and stir them evenly to obtain emulsion A; then add the crosslinking agent and defoaming agent to emulsion A, increase the speed, stir them evenly again, and then add the modified polyurethane to obtain emulsion B. Then adjust the pH value of emulsion B to 6.2-8.2 to obtain a water-based release agent;

[0036] A water-based release agent is coated on a substrate and baked and cured to form a water-based release layer on the substrate; an ink-absorbing ink is then coated on the water-based release layer and baked and cured to form an ink-absorbing layer on the water-washable release layer to obtain a heat transfer film.

[0037] By adopting the above technical solution, the preparation method of the water-based release agent is simple and efficient, ensuring that the components are fully mixed and evenly mixed, and improving the stability of the water-based release layer. Specifically:

[0038] Preparation of water-based release agent: By mixing modified water-based acrylate, deionized water, crosslinking agent, defoaming agent and modified polyurethane in specific proportions and adjusting the pH value, the wetting, dispersibility and initial adhesion of the water-based release agent are effectively improved, enabling it to stably adhere to the surface of the base layer and form a uniform water-based release layer.

[0039] Formation of water-based release layer: The prepared water-based release agent is coated on the substrate and baked and cured. The formed water-based release layer has good heat resistance and peeling properties, ensuring that the ink-absorbing layer can quickly separate from the water-based release layer during the thermal transfer process and firmly adhere to the surface of the substrate, avoiding residue problems and significantly improving the thermal transfer efficiency and transfer effect.

[0040] Formation of ink-absorbing layer: The ink-absorbing ink is coated on the solidified water-based release layer, and then baked and solidified again to form the ink-absorbing layer. This process ensures the quality and thickness consistency of the ink-absorbing layer, and further optimizes the overall performance of the heat transfer film.

[0041] In summary, this application includes at least one of the following beneficial technical effects:

[0042] 1. The water-based release layer is made of modified water-based acrylate, hydrogenated polysiloxane, phenyl hydroxyl network silicone resin and other ingredients. It has good wetting and dispersibility and initial adhesion, can stably adhere to the surface of the base layer, and form a uniform water-based release layer after curing, effectively solving the problem of the ink-absorbing layer and the release layer being difficult to peel off when the heat transfer film is transferred over a large area; 2. The cured water-based release layer enables the ink-absorbing layer to quickly detach and stably adhere to the surface of the substrate during the thermal transfer process, avoiding the situation where the ink-absorbing layer remains on the surface of the release layer, and significantly improving the thermal transfer efficiency and transfer effect. DETAILED DESCRIPTION

[0043] The present application is further described in detail below with reference to the embodiments.

[0044] Waterborne polyurethane resin, manufacturer Anhui Yuanchen New Material Technology Co., Ltd., model YC-305;

[0045] Heat transfer printing ink: Brand model Aocai XP600;

[0046] Castor oil modified polyol, brand Shuer, model 65522;

[0047] The brand model of the curing agent is Covestro Imprafix 2794;

[0048] The stabilizer is diethylene glycol;

[0049] The defoaming agent is a silicone defoaming agent, the brand model is Evonik TEGO AIREX 902W;

[0050] Paraffin emulsion, brand Xiyu, model XY-30

[0051] The palm wax emulsion is a water-based carnauba wax emulsion, brand model Xinghong water-based wax B-20603;

[0052] The polytetrafluoroethylene emulsion is a polytetrafluoroethylene dispersion emulsion, the brand model is Juhua JF-4DCD;

[0053] Hydrogen-terminated phenyl polysiloxane, brand: Maidehao, model: MDH 233;

[0054] Fluorine-modified polysiloxane containing hydrogen fluorosilicone oil, Hangzhou Heyu Technology Co., Ltd. model FGY-402;

[0055] Methylphenyl silicone resin containing silanol, brand model Longsheng Sihai SH-1068.

[0056] Example

[0057] Example 1

[0058] A single-sided, water-based, environmentally friendly heat transfer film comprises, from top to bottom, an ink-absorbing layer, a water-based release layer, and a base layer. The ink-absorbing layer is 10-200 microns thick, the base layer is 50-500 microns thick, and the water-based release layer is 10-50 microns thick. In this embodiment, the ink-absorbing layer is preferably 30 microns thick, the base layer is 200 microns thick, and the water-based release layer is 20 microns thick. The base layer is made of PET.

[0059] The single-sided water-based environmentally friendly heat transfer film is prepared by the following method:

[0060] In parts by weight, the modified water-based acrylate is prepared by 8 parts of alkenyl siloxane, 5 parts of hydrogen-containing polysiloxane, 10 parts of phenyl hydroxyl network silicone resin, 10 parts of bonding aid, 3 parts of initiator, 2 parts of surfactant and 62 parts of water; the bonding aid is paraffin emulsion; the hydrogen-containing polysiloxane is hydrogen-terminated phenyl polysiloxane; the phenyl hydroxyl network silicone resin is a methylphenyl silicone resin containing silanol groups; the initiator is ammonium persulfate; the surfactant is OP-10; and the alkenyl siloxane is (acryloxymethyl)dimethylmethoxysilane.

[0061] Water-based release agent: 35 parts of modified water-based acrylic resin were weighed and mixed with 50 parts of deionized water, based on the weight percentage of the water-based release agent. Stir at 300 rpm for 10 minutes to thoroughly mix, to obtain Emulsion A. 15 parts of a crosslinker and 1.5 parts of a defoamer were then added to Emulsion A. Stir at 3000 rpm for 10 minutes to thoroughly mix, and 10 parts of a modified polyurethane were added to obtain Emulsion B. Ammonia was added and the pH of Emulsion B was adjusted to 8 to obtain the water-based release agent. The modified polyurethane was a water-based polyurethane resin. The crosslinker was diacetone acrylamide.

[0062] The ink-absorbing ink is composed of a water-based polyurethane resin, an adsorbent filler, a diluent, a stabilizer, and a curing agent in a weight ratio of 50:20:15:5:1. The adsorbent filler is aluminum oxide; the diluent is castor oil-modified polyol; and the stabilizer is diethylene glycol.

[0063] A water-based release agent is coated on a substrate and baked at a temperature of 110°C for 2 minutes to form a water-based release layer on the substrate; then, ink-absorbing ink is coated on the water-based release layer, and the drying temperature is 85°C and the drying time is 1 hour to form an ink-absorbing layer on the water-washable release layer to obtain a heat transfer film.

[0064] Example 2

[0065] The difference between Example 2 and Example 1 is that the amount of raw materials of the water-based release agent is different, as follows:

[0066] According to weight parts, 40 parts of modified water-based acrylic resin, 45 parts of deionized water, 13 parts of cross-linking agent, 1.2 parts of defoaming agent, and 6 parts of modified polyurethane.

[0067] Example 3

[0068] The difference between Example 3 and Example 1 is that the amount of raw materials of the water-based release agent is different, as follows:

[0069] According to weight parts, 45 parts of modified water-based acrylic resin, 40 parts of deionized water, 10 parts of cross-linking agent, 1 part of defoaming agent, and 5 parts of modified polyurethane.

[0070] Example 4

[0071] The difference between Example 4 and Example 2 is that the bonding agent is palm wax emulsion.

[0072] Example 5

[0073] The difference between Example 5 and Example 2 is that the bonding agent is polytetrafluoroethylene emulsion.

[0074] Example 6

[0075] The difference between Example 6 and Example 2 is that the bonding agent is composed of paraffin emulsion, palm wax emulsion, and polytetrafluoroethylene emulsion in a weight ratio of 1:1:1.

[0076] Example 7

[0077] The difference between Example 7 and Example 2 is that the bonding agent is composed of paraffin emulsion, palm wax emulsion, and polytetrafluoroethylene emulsion in a weight ratio of 1:2:3.

[0078] Example 8

[0079] The difference between Example 8 and Example 2 is that the bonding agent is composed of paraffin emulsion, palm wax emulsion, and polytetrafluoroethylene emulsion in a weight ratio of 1:3:4.

[0080] Example 9

[0081] The difference between Example 9 and Example 2 is that the hydrogen-containing polysiloxane is a fluorine-modified polysiloxane containing hydrogen fluorosilicone oil.

[0082] Example 10

[0083] The difference between Example 10 and Example 2 is that the hydrogen-containing polysiloxane is composed of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane hydrogen-containing fluorosilicone oil in a weight ratio of 1:1.

[0084] Example 11

[0085] The difference between Example 11 and Example 7 is that the hydrogen-containing polysiloxane is composed of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane hydrogen-containing fluorosilicone oil in a weight ratio of 1:1.

[0086] Example 12

[0087] The difference between Example 12 and Example 7 is that the hydrogen-containing polysiloxane is composed of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane hydrogen-containing fluorosilicone oil in a weight ratio of 1:3.

[0088] Example 13

[0089] The difference between Example 13 and Example 2 is that the alkenylsiloxane is methacryloxypropyl tris(trimethylsiloxy)silane.

[0090] Example 14

[0091] The difference between Example 14 and Example 2 is that the alkenyl siloxane is composed of (acryloxymethyl)dimethylmethoxysilane and methacryloxypropyltris(trimethylsiloxy)silane in a weight ratio of 1:3.

[0092] Example 15

[0093] The difference between Example 15 and Example 7 is that the alkenyl siloxane is composed of (acryloxymethyl)dimethylmethoxysilane and methacryloxypropyltris(trimethylsiloxy)silane in a weight ratio of 1:3.

[0094] Example 16

[0095] The difference between Example 16 and Example 11 is that the alkenyl siloxane is composed of (acryloxymethyl)dimethylmethoxysilane and methacryloxypropyltris(trimethylsiloxy)silane in a weight ratio of 1:3.

[0096] Comparative Example

[0097] Comparative Example 1

[0098] The difference between Comparative Example 1 and Example 1 is that an equal amount of hydrogen-containing polysiloxane is replaced by phenyl hydroxy network silicone resin.

[0099] Comparative Example 2

[0100] The difference between Comparative Example 2 and Example 1 is that the phenyl hydroxyl network silicone resin is replaced by alkenyl siloxane in equal amounts.

[0101] Comparative Example 3

[0102] The difference between Comparative Example 3 and Example 1 is that an equal amount of alkenylsiloxane is replaced by phenylhydroxy network silicone resin.

[0103] Comparative Example 4

[0104] The difference between Comparative Example 4 and Example 1 is that the bonding agent is replaced by alkenylsiloxane in equal amounts.

[0105] Comparative Example 5

[0106] The difference between Comparative Example 5 and Example 1 is that alkenylsiloxane and hydrogen-containing polysiloxane are replaced by phenylhydroxy network silicone resin in equal amounts.

[0107] Performance testing

[0108] Detection method / test method

[0109] Test 1;

[0110] The heat transfer films obtained in Examples 1-16 and Comparative Examples 1-5 were cut into experimental samples of 50*50 cm.

[0111] The heat transfer printing ink is sprayed onto the ink-absorbing layer of the heat transfer film (experimental sample) through a spraying device, and the spraying amount is 88g / m 2 , a pattern layer is formed on the surface of the ink-absorbing layer, and then one side of the pattern layer is attached to the surface of the aluminum alloy plate. When the vacuum meter shows a vacuum of -0.1MPa, the temperature is 175℃, and thermal transfer is performed. The transfer time is 100s, so that the ink-absorbing layer peels off the water-based release layer and is thermally transferred to the surface of the aluminum alloy plate together with the pattern layer, and a pattern layer is formed on the aluminum alloy surface. Observe whether the pattern layer on the surface of the aluminum alloy plate has defects, bubbles, etc., or whether residual glue appears on the water-based release layer. If the above situation does not occur, the transfer time is recorded as 100s; if the above problems occur, extend the transfer time by 20s each time until the pattern layer or water-based release layer on the surface of the alloy plate does not have the above phenomena, and record the corresponding time.

[0112] Test 2;

[0113] The experimental samples obtained from Examples 1-16 and Comparative Examples 1-5 were subjected to the transfer method of Test 1, with a transfer time of 200 seconds to obtain a pattern layer on the surface of the alloy plate. The falling sand test method was used to test the test standard according to GB / T5237-2008. The time it took for the pattern layer to show through was observed every 5 minutes. During the bottom-showing test, any three positions of the pattern layer on the surface of each alloy plate were tested, with one position located at the center, one position 5 cm away from any edge, and another position selected at random. The average bottom-showing time of the three positions was calculated, and then the difference was calculated. The difference was equal to the bottom-showing time obtained from the test at that position minus the average bottom-showing time. Finally, the absolute value was taken, and the average difference was calculated.

[0114] The above experimental data are shown in Table 1.

[0115] Table 1 Experimental data of Examples 1-16 and Comparative Examples 1-5

[0116] Test items Transfer time (min) Average difference Example 1 240 6.67 Example 2 240 6.67 Example 3 240 6.67 Example 4 240 6.67 Example 5 260 6.67 Example 6 220 3.67 Example 7 200 1.67 Example 8 220 3.67 Example 9 240 3.67 Example 10 160 0 Example 11 140 0 Example 12 140 0 Example 13 260 3.67 Example 14 200 1.34 Example 15 160 0 Example 16 100 0 Comparative Example 1 280 13.34 Comparative Example 2 280 13.34 Comparative Example 3 280 13.34 Comparative Example 4 280 20 Comparative Example 5 300 15

[0117] Combining Example 1 and Comparative Examples 1-5 and Table 1, it can be seen that the transfer time of Comparative Examples 1-5 is longer, and the average difference values ​​of Comparative Examples 1-5 are also greater than the average difference value of Example 1, indicating that the modified water-based acrylate prepared by using alkenylsiloxane, hydrogen-containing polysiloxane, phenylhydroxyl network silicone resin, bonding aid, surfactant and water of the present application, combined with the water-based release agent raw material system, can obtain better release performance, and can make the ink-absorbing layer fall off quickly and completely during thermal transfer, thereby improving the processing efficiency of thermal transfer and ensuring the quality after thermal transfer.

[0118] Combining Example 2 with Examples 7-8 and Table 1, it can be seen that the thermal transfer time of Examples 6-8 is shorter than that of Example 2, and the average difference of Examples 6-8 is smaller than the average difference of Example 2, indicating that Examples 6-8 use a compound of paraffin wax emulsion, palm wax emulsion, and polytetrafluoroethylene emulsion to play a synergistic role, further improving the peeling effect of the heat transfer film during thermal transfer.

[0119] In combination with Example 2, Example 7, Example 11 and Table 1, the time and average difference of the bottom-transparent book of Example 11 are better than those of Example 2 and Example 7, indicating that the use of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane containing hydrogen fluorosilicone oil for compounding, and then combining paraffin emulsion, palm wax emulsion, polytetrafluoroethylene emulsion to prepare the bonding auxiliary agent, and the raw material composition of the present application can achieve better results, while improving the transfer efficiency and ensuring the quality of the transfer.

[0120] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A single-sided water-based environmentally friendly heat transfer film, comprising an ink-absorbing layer, a water-based release layer and a base layer from the upper surface to the lower surface, characterized in that: The water-based release layer is obtained by curing the water-based release agent, and the water-based release agent is composed of the following raw materials in the following weight percentages: 35-45 parts of modified water-based acrylate 40-50 parts deionized water 10-15 parts crosslinking agent 1-1.5 parts defoaming agent 5-10 parts of modified polyurethane; The modified water-based acrylate is prepared from alkenyl siloxane, hydrogen-containing polysiloxane, phenyl hydroxyl network silicone resin, bonding agent, initiator, surfactant and water; The bonding agent is composed of paraffin wax emulsion, palm wax emulsion and polytetrafluoroethylene emulsion in a weight ratio of 1: (1-3): (1-4); The hydrogen-containing polysiloxane is composed of hydrogen-terminated phenyl polysiloxane and fluorine-modified polysiloxane hydrogen-containing fluorosilicone oil in a weight ratio of 1: (1-3); The phenyl hydroxy network silicone resin is a methylphenyl silicone resin containing silanol groups; The alkenylsiloxane is (acryloxymethyl)dimethylmethoxysilane and / or methacryloxypropyltris(trimethylsiloxy)silane; The modified polyurethane is a waterborne polyurethane resin.

2. The single-sided water-based environmentally friendly heat transfer film according to claim 1, characterized in that: The cross-linking agent is one or more of diacetone acrylamide, adipic acid dihydrazide, and hexamethylenediamine.

3. The single-sided water-based environmentally friendly heat transfer film according to claim 1, characterized in that: The ink-absorbing layer is formed by coating ink-absorbing ink on the water-based release layer and curing the ink-absorbing ink. The ink-absorbing ink consists of water-based polyurethane resin, adsorption filler, diluent, stabilizer and curing agent.

4. A method for preparing a single-sided water-based environmentally friendly heat transfer film according to claim 2 or 3, characterized in that: The following steps are involved: Water-based release agent: Weigh the modified water-based acrylic resin and deionized water in parts by weight, mix them, and stir them evenly to obtain emulsion A; then add the crosslinking agent and defoaming agent to emulsion A, increase the speed, stir them evenly again, and then add the modified polyurethane to obtain emulsion B. Then adjust the pH value of emulsion B to 6.2-8.2 to obtain a water-based release agent; The water-based release agent is coated on the substrate and baked to form a water-based release layer on the substrate; Then, the ink-absorbing ink is coated on the water-based release layer, baked and solidified, and an ink-absorbing layer is formed on the water-based release layer to obtain a heat transfer film.