Water-based ink-jet printing glue, preparation method thereof and white ink pyrography method

Abstract

The invention relates to the technical field of ink-jet printing, in particular to water-based ink-jet printing glue, a preparation method of the water-based ink-jet printing glue and a white ink pyrography method. The water-based ink-jet printing glue is prepared from the following raw materials: 5-60% of water-based hot melt resin, 1-35% of an auxiliary agent and the balance of a water-based solvent, the auxiliary agent at least comprises a humectant and a surfactant; the solid content of the water-based hot melt resin is 20-50%. The invention innovatively provides a water-based ink-jet printing glue scheme, through elaborate formula design and process matching, the prepared water-based ink-jet printing glue can replace a traditional white ink pyrography powder shaking operation mode, the printing effect is improved, meanwhile, the process efficiency and the environmental protection safety are improved, and the water-based ink-jet printing glue is suitable for large-scale popularization and application. And the white ink pyrography technology is promoted to be healthily developed towards the high-quality, efficient, environment-friendly and safe direction. And the provided white ink pyrography process is high in practicability and wide in application prospect.

Description

Technical Field

[0001] This invention relates to the field of inkjet printing technology, and in particular to a water-based inkjet printing adhesive and its preparation method, as well as a white ink heat transfer method. Background Technology

[0002] With the continuous development of inkjet printing technology and thermal transfer processes, white ink heat transfer printing technology has received increasing attention due to its strong color expression. Currently, the mainstream white ink heat transfer printing process uses hot melt powder as an important auxiliary material. First, the design is printed on a substrate such as PET heat transfer film. Then, hot melt powder is sprinkled onto the substrate, allowing it to adhere to the printed design. Excess powder is then removed by shaking off excess powder. After high-temperature drying, the hot melt powder and the printed design are fused together. Finally, a heat press transfers the design onto fabric or other materials. However, the powder-sprinkling process for heat transfer printing using hot melt powder has the following drawbacks: 1) Limited print quality: It is difficult to accurately control the amount and distribution of hot melt powder, which can easily lead to uneven powder application, resulting in damage to the fineness and clarity of the pattern; 2) Thicker coating and poor product feel: The adhesive layer formed by hot melt powder after transfer is relatively thick, which affects the feel and breathability of the product; 3) Low process efficiency: Heat transfer printing using hot melt powder requires first sprinkling powder and then shaking it off, which is a relatively complex process and results in low production efficiency; 4) Safety and environmental issues: The powder-sprinkling operation can easily cause dust pollution, which is harmful to the working environment and the health of operators.

[0003] Chinese invention patent application CN109517442A discloses a water-based pigment ink for wide-format printers, its preparation method, and its application. By adding water-based rheology modifiers and other modifiers to the water-based pigment ink, the problems of uneven imaging on non-absorbent materials and severe diffusion on absorbent materials are solved, achieving efficient and environmentally friendly printing results on wide-format printers. However, the ink provided by this technology does not have transfer function and is difficult to apply to white ink heat transfer printing processes.

[0004] Chinese invention patent CN111254721B discloses a novel heat transfer printing ink, its preparation method, and its application. The ink is prepared by compounding 10-30% pigment dispersion, 10-20% water-based hot melt adhesive resin, 1-10% water-based resin, 10-30% humectant, 0.5-5% surfactant, and 0-1% bactericide, solving the problem of difficult heat transfer printing on dark fabrics and achieving direct high-temperature transfer. However, the ink color obtained by this method is determined by the pigment, which on the one hand cannot meet the needs of complex design patterns, and on the other hand, ink containing pigment is prone to clogging the printhead, damaging the equipment, resulting in poor process operability and low production efficiency.

[0005] Against this backdrop, it is imperative to provide a white ink heat transfer printing technology that offers excellent printing results, high process efficiency, and is safe and environmentally friendly. Summary of the Invention

[0006] To address the technical problems of existing white ink heat transfer printing technology, such as poor pattern printing effect, low production efficiency, poor product feel, and non-environmentally friendly process, this invention innovatively proposes a water-based inkjet printing adhesive solution. Through careful formulation design and process matching, the resulting water-based inkjet printing adhesive can replace the traditional white ink heat transfer powder shaking operation method, improving printing effect while also increasing process efficiency and environmental safety. This promotes the healthy development of white ink heat transfer technology towards high quality, high efficiency, environmental protection, and safety, and has significant practical significance and application value.

[0007] The first aspect of the present invention provides an aqueous inkjet printing adhesive, wherein, by weight percentage, the raw materials for preparing the aqueous inkjet printing adhesive include: 5-60% aqueous hot melt resin, 1-35% additives, and the balance being aqueous solvent; the solid content of the aqueous hot melt resin is 20-50%.

[0008] Optionally, the adjuvant includes at least a humectant and a surfactant; the mass ratio of the humectant to the surfactant is (10-30):(0.1-5).

[0009] The waterborne hot melt resin of the present invention may include waterborne polyurethane resin, waterborne acrylic resin, waterborne polyester resin, polyvinyl alcohol resin, waterborne silicone resin, etc.

[0010] Optionally, the waterborne hot melt resin includes one or more combinations of waterborne polyurethane resin, waterborne acrylic resin, and waterborne polyester resin.

[0011] Alternatively, the waterborne hot melt resin may be a waterborne polyurethane resin.

[0012] Optionally, the solid content of the waterborne polyurethane resin is 30-45%; examples include 20%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 40%, and 45%; further options include 30%, 40%, and 45%.

[0013] Optionally, the humectant includes one or more combinations of 1,2-propanediol, diethylene glycol, triethylene glycol, glycerol, butylene glycol, and polyethylene glycol; more preferably, the humectant includes one or more combinations of 1,2-propanediol, diethylene glycol, triethylene glycol, and glycerol.

[0014] Further optionally, the humectant is 1,2-propanediol.

[0015] Optionally, the surfactant includes one or more of the following: acetylene surfactants, polyether siloxane surfactants, fatty alcohol polyoxyethylene ether surfactants (AEO series), sorbitol fatty acid ester surfactants (Span series), alkyl glycoside surfactants, carboxylate surfactants, and sulfonate surfactants.

[0016] Optionally, the surfactant includes one or two of acetylene surfactants and polyether siloxane surfactants.

[0017] Optionally, the surfactant includes acetylene surfactants and polyether siloxane surfactants.

[0018] Further optionally, the mass ratio of the acetylene surfactant to the polyether siloxane surfactant is (1.5-4):1; for example, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1; further optionally, 2:1.

[0019] Optionally, the acetylene surfactant is an acetylenic diol surfactant; more preferably, it is an ethoxylated acetylenic diol surfactant; the ethoxylated acetylenic diol surfactant can be commercially available, such as the GREESOL E65 product from Yueyang Kaimen Additives Waterborne Additives Co., Ltd.

[0020] Optionally, the polyether siloxane surfactant may be commercially available, such as GREESOL H83 from Yueyang Kaimen Additives Waterborne Additives Co., Ltd., or BYK-348.

[0021] The aqueous solvent includes, but is not limited to, water, and is preferably deionized water.

[0022] The water-based inkjet printing adhesive provided by this invention can also be supplemented with other additives according to usage requirements, including but not limited to pH adjusters, preservatives, wetting agents, dispersants, etc., which can be flexibly selected according to usage needs.

[0023] This invention uses a waterborne polyurethane resin with a solid content of 30-40% as the waterborne hot melt resin, and combines it with an alcohol-based humectant and a surfactant. The surfactant is further preferably an acetylene surfactant or a polyether siloxane surfactant, resulting in a waterborne inkjet printing adhesive with excellent printing effects. On one hand, the resulting waterborne inkjet printing adhesive can form a strong bond with various substrates, especially with fabrics, exhibiting high adhesion strength. After washing or wet / dry rubbing, the finished pattern is not easily detached, and the printing effect is reliable. On the other hand, the resulting waterborne inkjet printing adhesive has ideal leveling and wetting properties, and suitable surface tension. While adhering firmly to the substrate, it also imparts good softness to the substrate, preventing the composite product from feeling heavy or having a poor feel due to the application of the adhesive layer. The resulting heat transfer print has good comfort and a superior user experience. Furthermore, the adhesive of this invention has stable physicochemical properties, strong uniformity, and is not prone to drying or clumping. It is not easily clogged during use and storage, making it friendly to inkjet printing equipment and solving the problem of traditional inks easily clogging printheads during use. The water-based inkjet printing adhesive of the present invention can improve the comfort of the product and the operability of the process while ensuring the printing effect, and is suitable for use in white ink heat transfer printing process.

[0024] A second aspect of this invention provides a method for preparing an aqueous inkjet printing adhesive, the preparation steps of which include:

[0025] S1. Mix the aqueous solvent and additives, disperse them evenly, and obtain material one;

[0026] S2. Add the water-based hot melt resin to material one and disperse it evenly to obtain material two;

[0027] S3. Filter material 2 to obtain water-based inkjet printing adhesive.

[0028] In some embodiments, the dispersion is achieved by high-speed stirring; optionally, the high-speed stirring speed is 500-2000 rpm; more preferably, the high-speed stirring speed is 1200 rpm.

[0029] In some embodiments, the filtration specifically involves passing the material two sequentially through a nanofiltration membrane with a first pore size and a second pore size for step-by-step filtration; the first pore size is larger than the second pore size.

[0030] Optionally, the first pore size is 1-10 μm; examples include 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm; further optionally, it is 1 μm.

[0031] Optionally, the second pore size is 0.1-0.5 μm; examples include 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, and 0.5 μm; further optionally, it is 0.5 μm.

[0032] This invention uses a nanofiltration membrane to filter materials step by step, which further improves the dispersion uniformity and stability of water-based inkjet printing adhesives, and avoids the negative impact of impurities, bubbles and other contaminants on the adhesive medium, thus preventing further impact on printing results.

[0033] A third aspect of the present invention provides a method for hot stamping with white ink, comprising:

[0034] Step 1: Provide the design pattern;

[0035] Step 2: Print the design pattern: Use an inkjet printer to print the water-based inkjet printing adhesive, white ink matching the design pattern, and colored heat transfer ink onto the surface of the PET heat transfer film to form the target pattern;

[0036] Step 3: Dry the printed PET heat transfer film, and then transfer the design pattern on the PET heat transfer film to the surface of the substrate; after the transfer is completed, remove the PET heat transfer film to obtain the finished heat transfer product.

[0037] In some implementations, the printing sequence in step two is: colored heat transfer ink, white ink, and water-based inkjet printing adhesive.

[0038] In some embodiments, the drying temperature in step three is 100-160°C and the drying time is 1-6 minutes.

[0039] Optionally, the drying temperature in step three is 140-160℃, and the drying time is 1-5 minutes. The drying process of this invention is highly flexible, requiring no prolonged drying time. Transfer printing can be performed in a semi-dry state. In actual operation, only about 1-5 minutes of drying is needed before proceeding to the next transfer step, eliminating the need to wait for the PET heat transfer film to completely dry. This greatly improves production efficiency and makes the operation highly practical.

[0040] In some embodiments, a tunnel oven is used for drying in step three.

[0041] In some implementations, a heat press is used to perform the transfer operation in step three.

[0042] In some embodiments, the substrate includes fabrics, leather / artificial leather, plastic products, etc., preferably fabrics; the material of the fabric includes, but is not limited to, cotton, polyester, nylon, acrylic, vinylon, polypropylene, blends, etc.

[0043] Optionally, the material of the fabric includes cotton, polyester, or a polyester-cotton blend; it is further optional to use cotton.

[0044] This invention presents a meticulously designed water-based inkjet printing adhesive formula applied to white ink heat transfer printing. In practice, the design pattern is printed onto a PET heat transfer film in the order of colored heat transfer pigment ink, white ink, and water-based inkjet printing adhesive. After drying, the design pattern on the PET heat transfer film is transferred to the substrate surface. The PET heat transfer film is then removed to obtain the finished heat transfer print. This method offers several advantages over traditional hot melt powder methods. Firstly, it eliminates the need for powder sprinkling and shaking, simplifying the process and eliminating pollution. Secondly, it ensures the heat transfer pattern adheres firmly to the substrate surface, maintaining high adhesion even after washing and dry / wet rubbing. Furthermore, the final heat transfer print exhibits good flexibility, breathability, and a pleasant feel, resulting in a superior user experience. The white ink heat transfer printing process provided by this invention is highly operable and has broad application prospects.

[0045] Beneficial effects:

[0046] This invention provides a water-based inkjet printing adhesive and its preparation method, as well as a white ink heat transfer method, which has the following advantages:

[0047] (1) This invention provides a water-based inkjet printing adhesive. The adhesive, which is compounded with water-based hot melt resin, additives and water-based solvent with a specific solid content, can be applied to the white ink heat transfer process, replacing the traditional hot melt powder to achieve the transfer of the design pattern. It not only improves the printing effect, the fineness and clarity of the pattern, but also simplifies the white ink heat transfer process. It is also safe, environmentally friendly and highly practical.

[0048] (2) The preferred water-based hot melt resin of the present invention is a water-based polyurethane resin with a solid content of 30-45%, which can effectively improve the bonding strength between the water-based inkjet printing adhesive and the substrate. The resulting water-based inkjet printing adhesive can effectively transfer the target pattern to the surface of the substrate, effectively improving the adhesion strength of the water-based inkjet printing adhesive.

[0049] (3) The preferred additives of the present invention include humectants and surfactants. More preferably, the surfactants are acetylene surfactants or polyether siloxane surfactants, which can improve the leveling and wetting properties of water-based inkjet printing adhesives, optimize printing quality, and enable the pattern to effectively bond with the substrate (especially fabric). The final heat transfer finished product can maintain excellent pattern quality after water washing and dry and wet wiping tests. The pattern is not easy to fall off and the printing effect is stable and reliable.

[0050] (4) The water-based inkjet printing adhesive of the present invention preferably contains a specific amount of alcohol humectant. The resulting adhesive is compatible with inkjet printing operation. The physicochemical properties of the adhesive are stable. It will not dry out or clump during use and storage, nor will it cause problems such as nozzle clogging. This avoids damage to the equipment and has strong compatibility with the equipment.

[0051] (5) The present invention uses nanofiltration membranes with first and second pore sizes to filter the glue step by step, ensuring that there are no impurities or bubbles in the glue, improving the stability of the glue, and further ensuring the consistency of the quality of heat transfer products.

[0052] (6) The present invention uses water-based inkjet printing adhesive to transfer the design pattern on the PET heat transfer film to the fabric. The adhesive layer is soft and thin, and the resulting fabric has good breathability, is not stuffy or heavy, and has a good user experience. The adhesive gives the fabric better comfort and feel.

[0053] (7) This invention uses water-based inkjet printing adhesive in the white ink heat transfer process. The design pattern is printed onto the PET heat transfer film in the order of colored ink, white ink and adhesive. Then, it is dried, transferred, and the PET heat transfer film is removed to obtain the heat transfer finished product. The overall process is simple and does not require powdering or shaking. It improves process efficiency, reduces energy consumption, avoids dust pollution, and is highly operable.

[0054] (8) The water-based inkjet printing adhesive provided by the present invention uses water as a carrier, and will not produce harmful gases during production and use. It is environmentally friendly and has no risk of flammability or explosion, thus ensuring the health of operators and production safety. Detailed Implementation

[0055] To address the technical problems of poor printing effect, complex process, and environmental unfriendliness of traditional white ink heat transfer printing, this invention provides a water-based inkjet printing adhesive and its preparation method, as well as a novel white ink heat transfer printing method. This method uses water-based hot melt adhesive inkjet printing instead of hot melt powder for white ink heat transfer printing, effectively improving the printing effect. Furthermore, the resulting heat transfer print maintains its pattern firmly after water wash fastness and wet / dry rubbing fastness tests. The process is simple, environmentally friendly, and safe, possessing extremely high practical value.

[0056] The following is some information about the raw materials used in the specific embodiments of the present invention:

[0057] The waterborne polyurethane resin (1) is AH-1701 product of Anhui Dawei Huatai New Material Technology Co., Ltd., with a solid content of 30%.

[0058] The waterborne polyurethane resin (2) is AH-1802A product of Anhui Dawei Huatai New Material Technology Co., Ltd., with a solid content of 40%.

[0059] The waterborne polyurethane resin (3) is AH-0201C product of Anhui Dawei Huatai New Material Technology Co., Ltd., with a solid content of 45%.

[0060] The acetylene surfactant is GREESOL E65, a product of Yueyang Kaimen Additives & Aqueous Additives Co., Ltd.

[0061] The polyether siloxane surfactant is GREESOL H83, a product of Yueyang Kaimen Additives & Aqueous Additives Co., Ltd.

[0062] Unless otherwise specified, all raw materials and equipment used in this invention are commercially available.

[0063] Examples 1-6

[0064] Examples 1-6 provide a water-based inkjet printing adhesive and its preparation method. The formulation of the water-based inkjet printing adhesive is shown in Table 1.

[0065] Table 1. Formulation of water-based inkjet printing adhesives in Examples 1-6 The values ​​in Table 1 represent the percentage by mass of the raw materials added to the formula, and " / " indicates that they were not added.

[0066] The preparation steps of the water-based inkjet printing adhesive include:

[0067] S1. Mix the aqueous solvent and additives, and disperse by high-speed stirring at 1200 rpm for 30 min to obtain material one;

[0068] S2. Add the water-based hot melt resin to material one, and stir at high speed to disperse it evenly to obtain material two;

[0069] S3. Material 2 is filtered stepwise using nanofiltration membranes with a first pore size (1μm) and a second pore size (0.5μm) to obtain water-based inkjet printing adhesive.

[0070] Examples 1-6 also provide a method for hot stamping with white ink, including:

[0071] Step 1: Provide the design pattern using computer software;

[0072] Step 2: Print the design pattern: Use an inkjet printer to print the water-based inkjet printing adhesive (from Examples 1-6), white ink matching the design pattern, and colored ink transfer pigment ink onto the surface of the PET heat transfer film to form the target pattern; the printing order is colored ink transfer pigment ink, white ink, and water-based inkjet printing adhesive.

[0073] Step 3: Transfer the printed PET heat transfer film to a tunnel oven for drying at 150℃ for 4 minutes. Then, use a heat press to transfer the design onto the substrate (cotton fabric). After the transfer is complete, peel off the PET heat transfer film, and the design will be transferred to the substrate, resulting in the finished heat transfer product.

[0074] Example 7

[0075] The specific implementation method is the same as in Example 1, except that no acetylene surfactant is added, the amount of polyether siloxane surfactant is adjusted to 1.5%, and the formulation of the water-based inkjet printing adhesive is shown in Table 2.

[0076] Table 2. Formulation of water-based inkjet printing adhesive in Example 7

[0077] raw material Quality percentage (%) AH-1701 30 1-2-Propylene Glycol 20 GREESOL H83 1.5 Deionized water 48.5 total 100

[0078] Example 8

[0079] The specific implementation method is the same as in Example 1, except that the surfactant is replaced with BYK-348, and the formula of the water-based inkjet printing adhesive is shown in Table 3.

[0080] Table 3. Formulation of water-based inkjet printing adhesive in Example 8

[0081]

[0082]

[0083] Example 9

[0084] The specific implementation method is the same as in Example 1, except that in step three, the printed PET heat transfer film is transferred to a tunnel oven for drying at a temperature of 150°C for 1 minute; then, a heat press is used to transfer the design pattern onto the surface of the substrate (the fabric material is cotton); after the transfer is completed, the PET heat transfer film is peeled off, and the design pattern is transferred to the surface of the substrate to obtain the finished heat transfer product.

[0085] Comparative Example 1

[0086] The specific implementation method is the same as in Example 1, except that the waterborne polyurethane resin is replaced with waterborne self-crosslinking acrylic resin, which is derived from Dow RESIN HF-05A; the formulation of the waterborne inkjet printing adhesive is shown in Table 4.

[0087] Table 4. Formulation of water-based inkjet printing adhesive for Comparative Example 1

[0088] raw material Quality percentage (%) RESIN HF-05A 30 1-2-Propylene Glycol 20 GREESOL E65 1 GREESOL H83 0.5 Deionized water 48.5 total 100

[0089] Comparative Example 2

[0090] The specific implementation method is the same as in Example 1, except that no polyether siloxane surfactant is added, the amount of acetylene surfactant is adjusted to 1.5%, and the formulation of the water-based inkjet printing adhesive is shown in Table 5.

[0091] Table 5. Formulation of water-based inkjet printing adhesive for Comparative Example 2

[0092] raw material Quality percentage (%) AH-1701 30 1-2-Propylene Glycol 20 GREESOL E65 1.5 Deionized water 48.5 total 100

[0093] Performance testing

[0094] 1. Physicochemical tests

[0095] The physicochemical properties of the water-based inkjet printing adhesives prepared in the examples and comparative examples were measured, and the test results are recorded in Table 6.

[0096] The pH value of the water-based inkjet printing adhesive prepared in the examples and comparative examples was determined using a pH meter (Brand: Leici, Model: PHS-25); the conductivity of the water-based inkjet printing adhesive prepared in the examples and comparative examples was determined using a conductivity meter (Brand: Leici, Model: DDS-11A); the viscosity of the water-based inkjet printing adhesive prepared in the examples and comparative examples was determined using a cone-plate viscometer (Brand: Brookfield, Model: DVNXVL, equipped with a cpa-40Z rotor) (viscosity was tested at 30℃); and the surface tension of the water-based inkjet printing adhesive prepared in the examples and comparative examples was determined using a surface tension meter (from Shanghai Hengping Instrument Factory, Model: BZY-1).

[0097] 2. Fastness test

[0098] To characterize the printing effect of the samples, the heat transfer prints prepared in the examples and comparative examples were subjected to water wash fastness test and dry and wet rubbing fastness test, and the test results are recorded in Table 7.

[0099] Test method for color fastness to washing: The color fastness to washing of the heat transfer printed products was determined according to the national standard GB / T 3921-2008 "Textiles - Tests for color fastness to washing". The test results are shown in Table 7.

[0100] Dry and wet rubbing fastness test method: The dry and wet rubbing fastness of the heat transfer printed products was determined according to the national standard GB / T 3920-2008 "Textiles - Tests for color fastness to rubbing". The test results are shown in Table 7.

[0101] Table 6. Physicochemical test results of the examples and comparative examples

[0102]

[0103]

[0104] Table 7. Fastness test results of the examples and comparative examples

[0105] Fastness performance Water wash resistance Dry rub fastness performance wet rubbing fastness performance Example 1 Level 4-5 Level 4 Level 1-2 Example 2 Level 4-5 Level 4 Level 2 Example 3 Level 4-5 Level 4 Level 3 Example 4 Level 4-5 Level 4 Level 3 Example 5 Level 4-5 Level 3 Level 1-2 Example 6 Level 4-5 Level 3 Level 1-2 Example 7 Level 4-5 Level 4 Level 3 Example 8 Level 4-5 Level 4 Level 3 Example 9 Level 4-5 Level 4 Level 3 Comparative Example 1 Level 4-5 Level 3 Level 2 Comparative Example 2 Level 4-5 Level 3 Level 2

[0106] As can be seen from the physicochemical test data in Table 6, the water-based inkjet printing adhesive prepared by this invention has low conductivity, viscosity and surface tension, and is well adapted to the inkjet printing application scenario. It is not easy to dry or clump during use, nor is it easy to clog the printhead. It is friendly to inkjet printing equipment and has strong practicality.

[0107] As can be seen from the fastness test data in Table 7, the water-based inkjet printing adhesive prepared by this invention has excellent printing effect. It uses water-based polyurethane resin with a solid content of 30-45% and alcohol humectants, and adds acetylene surfactants (GREESOL E65) or polyether siloxane surfactants (GREESOL H83, BYK-348) to the adhesive formula, which can give the product ideal leveling and wetting properties. The resulting heat transfer printed products have reliable water wash resistance and dry / wet rubbing fastness, thus ensuring printing quality.

[0108] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water-based inkjet printing adhesive, characterized in that, The raw materials for preparing the water-based inkjet printing adhesive, by weight percentage, include: 5-60% water-based hot melt resin, 1-35% additives, and the balance being water-based solvent; The adjuvants include at least humectants and surfactants; The solid content of the water-based hot melt resin is 20-50%.

2. The water-based inkjet printing adhesive according to claim 1, characterized in that, The waterborne hot melt resin includes one or more of waterborne polyurethane resin, waterborne acrylic resin, and waterborne polyester resin.

3. The water-based inkjet printing adhesive according to claim 2, characterized in that, The waterborne hot melt resin is a waterborne polyurethane resin; the solid content of the waterborne polyurethane resin is 30-45%.

4. The water-based inkjet printing adhesive according to claim 1, characterized in that, The humectant includes one or more combinations of 1,2-propanediol, diethylene glycol, triethylene glycol, glycerol, butylene glycol, and polyethylene glycol.

5. The water-based inkjet printing adhesive according to claim 1, characterized in that, The surfactants include one or more combinations of acetylene surfactants, polyether siloxane surfactants, fatty alcohol polyoxyethylene ether surfactants, sorbitol fatty acid ester surfactants, alkyl glycoside surfactants, carboxylate surfactants, and sulfonate surfactants.

6. The water-based inkjet printing adhesive according to claim 5, characterized in that, The surfactant includes one or both of acetylene surfactants and polyether siloxane surfactants.

7. A method for preparing an aqueous inkjet printing adhesive according to any one of claims 1-6, characterized in that, The preparation steps include: S1. Mix the aqueous solvent and additives, disperse them evenly, and obtain material one; S2. Add the water-based hot melt resin to material one and disperse it evenly to obtain material two; S3. Filter material 2 to obtain water-based inkjet printing adhesive.

8. The preparation method according to claim 7, characterized in that, The filtration process specifically involves passing material 2 through a nanofiltration membrane with a first pore size and a second pore size in sequence for step-by-step filtration. The first aperture is larger than the second aperture.

9. A method for hot stamping with white ink, characterized in that, include: Step 1: Provide the design pattern; Step 2: Use an inkjet printer to print the water-based inkjet printing adhesive as described in any one of claims 1-6, white ink matching the design pattern, and colored ink transfer pigment ink onto the surface of the PET heat transfer film to form the target pattern; Step 3: Dry the printed PET heat transfer film, and then transfer the design pattern on the PET heat transfer film to the surface of the substrate; after the transfer is completed, remove the PET heat transfer film to obtain the finished heat transfer product.

10. The white ink heat transfer method according to claim 9, characterized in that, In step two, the printing order is as follows: colored heat transfer ink, white ink, and water-based inkjet printing adhesive.

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