A heat transfer ink, its preparation and use

Abstract

This invention discloses a heat transfer ink, its preparation method, and its application. The heat transfer ink comprises the following components in parts by weight: 3-15 parts of polymer material, 6-45 parts of pigment, 0.5-10 parts of additives, and 50-85 parts of solvent. The polymer material includes chloroacetic acid resins, polymers, and cellulose materials. The chloroacetic acid resin is selected from at least one of ternary chloroacetic acid resins, ternary hydroxyl chloroacetic acid resins, and ternary carboxyl chloroacetic acid resins. The cellulose material is selected from at least one of ester cellulose and ether cellulose. The benzene-free and ketone-free ink of this invention retains good fineness, viscosity, and low solvent residue, and does not contain harmful ketone and benzene solvents, making it more environmentally friendly and safer. It can make heat transfer printed products completely odorless, meeting higher requirements.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of materials, and particularly relates to a heat transfer printing ink, a preparation method and application thereof. BACKGROUND

[0002] Different from traditional package printing, heat transfer printing is a special printing method, which belongs to a kind of transfer printing. That is, under the action of heat and external pressure, a process of transferring the graphics printed on a carrier film to a printing substrate through a heat transfer printing machine. The heat transfer printing technology has the characteristics of green environmental protection, simple operation, no need for plate making, multi-color pattern one-time forming, no need for color matching, vivid and rich color after transfer printing, and high accuracy, which greatly improves the added value and grade of products, and is widely used in cosmetic, food packaging, glass bottle, stainless steel kettle, electrical appliances and toy industries.

[0003] The heat transfer printing ink is an important part of the heat transfer printing technology, has various colors and patterns, and is the most intuitive embodiment of the artistic effect and decorative effect of printed products. However, in order to obtain good printing adaptability, solvent release and post-processing performance, the heat transfer printing ink sold on the market usually uses benzene and ketone solvents, which are highly toxic and have a great adverse effect on human health, and do not meet the requirements of the green environmental protection concept. SUMMARY

[0004] In order to overcome the problems existing in the prior art, one of the purposes of the present application is to provide a heat transfer printing ink.

[0005] The second purpose of the present application is to provide a preparation method of the heat transfer printing ink.

[0006] The third purpose of the present application is to provide an application of the heat transfer printing ink in the printing field.

[0007] In order to achieve the above purposes, the technical scheme adopted by the present application is as follows:

[0008] The first aspect of the present application provides a heat transfer printing ink, which comprises the following components by mass: 3-15 parts of a high molecular material, 6-45 parts of a pigment, 0.5-10 parts of an additive, and 50-85 parts of a solvent, wherein the high molecular material comprises a chlorovinyl acetate resin, a polymer and a cellulose material, the chlorovinyl acetate resin is selected from at least one of a ternary chlorovinyl acetate resin, a ternary hydroxyl chlorovinyl acetate resin and a ternary carboxyl chlorovinyl acetate resin, and the cellulose material is selected from at least one of an ester cellulose and an ether cellulose.

[0009] Preferably, the solvent does not contain benzene solvents and ketone solvents.

[0010] The benzene solvents in the present application include toluene, xylene and trimethylbenzene.

[0011] The copper-based solvent in the present application includes acetone, methyl ethyl ketone, cyclohexanone, methyl isobutyl ketone.

[0012] The polymer in the present application has stable performance, strong wetting property and good heat resistance, and is used as a connecting material in the ink formula, so that the ink in the present application has excellent solvent releasing property and printing adaptability. The cellulose material can make the ink in the present application have good solvent releasing property, and the chlorovinyl resin has excellent pigment wrapping property, so that the color brightness of the ink in the present application is improved. The present application uses the excellent solvent releasing property and printing adaptability of the polymer, and matches different proportions of ester cellulose or ether cellulose, chlorovinyl resin, so that the three components cooperate with each other to achieve the printing adaptability, solvent releasing property and post-processing performance of the benzene-free and ketone-free thermal transfer ink containing benzene and ketone.

[0013] Preferably, the mass fraction of the pigment is 10-45 parts; further preferably, the mass fraction of the pigment is 20-45 parts; more preferably, the mass fraction of the pigment is 25-45 parts.

[0014] Preferably, the ester cellulose is at least one of cellulose nitrate, cellulose acetate, cellulose acetate butyrate, and cellulose sulfonate.

[0015] Preferably, the ether cellulose is at least one of methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, cyanoethyl cellulose, hydroxypropyl cellulose, and hydroxypropyl methyl cellulose.

[0016] Preferably, the polymer is selected from polyurethane resin, phenylpropyl resin, or a combination thereof.

[0017] Preferably, the viscosity of the polyurethane resin at 25°C is 600-1400 mPa.s.

[0018] Preferably, the solid content of the polyurethane resin is 30-35%.

[0019] Preferably, the weight average molecular weight of the polyurethane is 25000-35000.

[0020] Preferably, the weight average molecular weight of the phenylpropyl resin is 50000-100000; further preferably, the weight average molecular weight of the phenylpropyl resin is 60000-90000.

[0021] Preferably, the solid content of the phenylpropyl resin is 25-50%; further preferably, the solid content of the phenylpropyl resin is 30-40%.

[0022] Preferably, the viscosity of the styrene-acrylic resin at 25℃ is 400-800 mPa·s; further preferably, the viscosity of the styrene-acrylic resin at 25℃ is 430-710 mPa·s.

[0023] Preferably, the acid value of the styrene-acrylic resin is 3-3.5 mgKOH / g.

[0024] Preferably, the glass transition temperature of the styrene-acrylic resin is 50-90℃.

[0025] Preferably, the auxiliary agent is selected from at least one of a dispersing agent, a leveling agent, an antifoaming agent, and an electrostatic agent.

[0026] Preferably, the auxiliary agent comprises the following components by weight: 0.2-3 parts of a dispersing agent, 0.2-3 parts of a leveling agent, 0.2-3 parts of an antifoaming agent, and 0.2-3 parts of an electrostatic agent.

[0027] Preferably, the weight fraction of the dispersing agent is 0.3-2 parts; further preferably, the weight fraction of the dispersing agent is 0.3-1.5 parts; and more further preferably, the weight fraction of the dispersing agent is 0.3-1 part.

[0028] Preferably, the weight fraction of the leveling agent is 0.3-2 parts; further preferably, the weight fraction of the leveling agent is 0.3-1.5 parts; and more further preferably, the weight fraction of the leveling agent is 0.3-1 part.

[0029] Preferably, the weight fraction of the antifoaming agent is 0.3-2 parts; further preferably, the weight fraction of the antifoaming agent is 0.3-1.5 parts; and more further preferably, the weight fraction of the antifoaming agent is 0.3-1 part.

[0030] Preferably, the weight fraction of the electrostatic agent is 0.3-2 parts; further preferably, the weight fraction of the electrostatic agent is 0.3-1.5 parts; and more further preferably, the weight fraction of the electrostatic agent is 0.3-1 part.

[0031] Preferably, the dispersing agent is selected from at least one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, alkyl aryl phosphate, alkyl benzene sulfonate, dialkyl sulfosuccinate, trimethyl stearamide chloride, polyoxyethylene alkyl phenol ether, and sorbitol alkylate.

[0032] Preferably, the leveling agent is selected from at least one of polydimethylsiloxane, polyether polyester modified organosiloxane, and alkyl modified organosiloxane.

[0033] Preferably, the antifoaming agent is selected from at least one of polydimethylsiloxane, silicone resin, dimethyl polysiloxane, dimethyl silicone oil, and emulsified silicone oil.

[0034] Preferably, the electrostatic agent is selected from at least one of stearyltrimethylammonium hydrochloride, stearyl benzoylpropyl hydroxyethyl quaternary ammonium nitrate, sodium p-nonylphenoxypropyl sulfonate, and tetrabromobisphenol A.

[0035] Preferably, the solvent is selected from at least two of ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate, isopropanol, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate.

[0036] Preferably, the pigment is an organic pigment, an inorganic pigment, or a combination thereof.

[0037] Preferably, the pigment is selected from at least one of white pigment, black pigment, red pigment, yellow pigment, blue pigment, green pigment, orange pigment, and purple pigment.

[0038] Preferably, the white pigment is selected from at least one of titanium dioxide and calcium carbonate.

[0039] Preferably, the black pigment is selected from carbon black.

[0040] The second aspect of the present invention provides a method for preparing the thermal transfer ink provided in the first aspect of the present invention, comprising the following steps: pre-dispersing polymeric materials, pigments, solvents and some additives, then grinding them, and then mixing them with the remaining additives to obtain the ink.

[0041] Preferably, in the grinding step, the grinding speed is 500–2000 r / min. More preferably, the grinding speed is 1000–2000 r / min.

[0042] Preferably, the grinding time in the grinding step is 30 to 240 minutes; more preferably, the grinding time is 40 to 120 minutes.

[0043] Preferably, in the grinding step, the first grinding flow rate is 3-6 L / min; the second grinding flow rate is 4-8 L / min.

[0044] Preferably, grinding is performed using grinding balls in the grinding step.

[0045] Preferably, the filling ratio of the grinding balls is 30-80%. The filling ratio of the grinding balls refers to the percentage of the volume of the grinding balls in the grinding cavity. More preferably, the filling ratio of the grinding balls is 40-70%; more preferably, the filling ratio of the grinding balls is 50-60%.

[0046] Preferably, the grinding ball is a zirconia bead.

[0047] Preferably, the mixing time is 10 to 50 minutes; more preferably, the mixing time is 20 to 40 minutes.

[0048] Preferably, the auxiliary agents include dispersants and leveling agents; the remaining auxiliary agents include defoamers and antistatic agents.

[0049] The third aspect of the present invention provides the application of the heat transfer ink provided in the first aspect of the present invention in the printing field.

[0050] The beneficial effects of this invention are as follows: The benzene-free and ketone-free ink of this invention retains good fineness, viscosity, and low solvent residue, and does not contain harmful ketone and benzene solvents, making it more environmentally friendly and safer. It also ensures that heat transfer printed materials are completely odorless, meeting higher-level requirements. Furthermore, the ink of this invention has excellent storage stability, and will not exhibit coarsening or stickiness during long-term storage. Moreover, the ink of this invention can significantly reduce the temperature during heat transfer, with a reduction of ≥29°C, which can significantly reduce energy consumption in mass production, meeting the requirements of energy-saving and environmentally friendly production.

[0051] The thermal transfer ink prepared by this invention, while maintaining the basic properties of the ink, achieves the same solvent release properties and printability without adding benzene-based or ketone-based solvents through formula improvements. Therefore, it can seamlessly replace the benzene- and ketone-free environmentally friendly thermal transfer ink of this invention in printing plants without changing their existing printing efficiency and equipment processes, making it safer and more environmentally friendly. Attached Figure Description

[0052] Fig. 1 This is a schematic diagram illustrating the principle of heat transfer printing. Detailed Implementation

[0053] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto. It should be noted that any processes not specifically described in detail below are those that can be implemented or understood by those skilled in the art by referring to the prior art. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0054] like Fig. 1 As shown, the principle of heat transfer printing is as follows: a colored pattern is pre-printed on a heat-resistant substrate film (through release treatment) to obtain a heat transfer film. Then, using specialized transfer equipment, the pattern on the heat transfer film is transferred to the surface of the product by hot stamping. The heat transfer film includes a release layer, an ink layer, and an adhesive layer sequentially stacked on the film. The heat transfer ink in this invention is the ink used in the preparation of the ink layer in the heat transfer film.

[0055] The embodiments and comparative examples of this invention all use white heat transfer ink as an example, which does not mean that the heat transfer ink in this invention is only applicable to white ink systems. This invention is also applicable to ink systems of other colors. The styrene-acrylic resin used in the following embodiments and comparative examples refers to a copolymer of styrene and acrylic acid. The parameter information of the styrene-acrylic resin and polyurethane used in Examples 1-5 and Comparative Examples 1-6 is as follows:

[0056] Styrene-acrylic resin A has a weight-average molecular weight of 90,000, a solid content of 40%, a viscosity of 540 mPa·s at 25°C, an acid value of 3.5 mg KOH / g, and a glass transition temperature (Tg) of 60°C.

[0057] Styrene-acrylic resin B: weight average molecular weight is 80,000, solid content is 30%, viscosity at 25℃ is 710 mPa·s, acid value is 3 mg KOH / g, and glass transition temperature (Tg) is 90℃.

[0058] Styrene-acrylic resin C: weight average molecular weight of 60,000, solid content of 40%, viscosity of 430 mPa·s at 25℃, acid value of 3.5 mg KOH / g, and glass transition temperature (Tg) of 50℃.

[0059] Polyurethane resin: weight average molecular weight of 30,000, solid content of 30%, viscosity of 1200 mPa·s at 25℃.

[0060] Example 1

[0061] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 1 below.

[0062] Table 1. Raw material composition of benzene-free and ketone-free heat transfer inks

[0063] Raw material Mass part Titanium white powder 32 Phenylpropyl resin A 10 Ternary hydroxyl chlorovinyl acetate resin 6 Ethyl cellulose resin 5 Sodium tripolyphosphate 0.5 Polydimethyl siloxane 0.5 Dimethyl silicone oil 0.5 Stearic trimethyl quaternary ammonium hydrochloride 0.5 Ethyl acetate 10 n-Propyl acetate 18 n-Butyl acetate 11 Isopropyl alcohol 3 Propylene glycol methyl ether acetate 3

[0064] Example 2

[0065] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 2 below.

[0066] Table 2. Raw material composition of benzene-free and ketone-free heat transfer inks

[0067] Raw material Mass part Titanium white powder 32 Polyurethane resin 10 Ternary carboxyl chlorovinyl acetate 6 Hydroxypropyl cellulose 5 Alkyl benzene sulfonate 0.5 Polyether modified organosiloxane 0.5 Dimethyl silicone oil 0.5 Stearic trimethyl quaternary ammonium nitrate 0.5 Ethyl acetate 10 n-Propyl acetate 18 n-Butyl acetate 11 Isopropyl alcohol 3 Propylene glycol methyl ether acetate 3

[0068] Example 3

[0069] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 3 below.

[0070] Table 3. Raw material composition of benzene-free and ketone-free heat transfer inks

[0071] Raw material Mass part Titanium white powder 32 Phenylpropyl resin B 6 Phenylpropyl resin C 6 Ternary hydroxyl chlorovinyl acetate 6 Cellulose acetate butyrate 6 Dialkyl sulfosuccinate 0.5 Alkyl modified organosiloxane 0.5 Dimethyl polysiloxane 0.5 Sodium p-nonyl phenoxy propyl sulfonate 0.5 Ethyl acetate 10 n-Propyl acetate 18 n-Butyl acetate 11 Isopropyl alcohol 3 Propylene glycol methyl ether acetate 3

[0072] Comparative Example 1

[0073] The raw material composition of the benzene- and ketone-containing heat transfer ink in this example is shown in Table 4 below. The difference between this example and Example 1 is that toluene and methyl ethyl ketone organic solvents are added in this example.

[0074] Table 4. Raw material composition of heat transfer inks containing phenyl and ketone

[0075] Raw material Mass part Titanium white powder 32 Phenylpropyl resin A 10 Ternary hydroxyl chlorovinyl acetate resin 6 Ethyl cellulose resin 5 Sodium tripolyphosphate 0.5 Polydimethyl siloxane 0.5 Dimethyl silicone oil 0.5 Stearic trimethyl quaternary ammonium hydrochloride 0.5 Butanone 18 Toluene 10 Ethyl acetate 5 n-Propyl acetate 6 Isopropyl alcohol 3 Propylene glycol methyl ether acetate 3

[0076] Comparative Example 2

[0077] The raw material composition of the benzene- and ketone-containing heat transfer ink in this example is shown in Table 5 below.

[0078] Table 5. Raw material composition of heat transfer inks containing phenyl and ketone

[0079] Raw material Mass part Titanium white powder 32 Polyurethane resin 10 Ternary carboxyl chlorovinyl acetate 6 Hydroxypropyl cellulose 5 Alkyl benzene sulfonate 1 Polyether modified organosiloxane 0.5 Dimethyl silicone oil 0.5 Stearic trimethyl quaternary ammonium nitrate 0.5 Butanone 20 Toluene 17.5 Xylene 7

[0080] Comparative Example 3

[0081] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 6 below.

[0082] Table 6. Raw material composition of benzene-free and ketone-free heat transfer inks

[0083] Raw material Mass part Titanium white powder 32 Phenylpropyl resin B 7 Phenylpropyl resin C 7 Ternary chlorovinyl acetate 7 Dialkyl sulfosuccinate 1 Alkyl modified organosiloxane 0.5 Dimethyl polysiloxane 0.5 Sodium p-nonyl phenoxy propyl sulfonate 0.5 Ethyl acetate 28 n-Propyl acetate 11.5 n-Butyl acetate 2 Propylene glycol methyl ether acetate 3

[0084] Comparative Example 4

[0085] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 7 below.

[0086] Table 7. Raw material composition of benzene-free and ketone-free heat transfer inks

[0087]

[0088]

[0089] Comparative Examples 3 and 4 used alcohol ester solvents to replace benzophenone solvents in traditional benzene- and ketone-containing thermal transfer ink formulations.

[0090] Comparative Example 5

[0091] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 8 below. The difference between this example and Example 1 is that this example does not contain ternary hydroxychloroacetic acid resin, and the mass fractions of ethyl cellulose resin and styrene-acrylic resin have been adjusted.

[0092] Table 8. Raw material composition of benzene-free and ketone-free heat transfer inks

[0093] Raw material Mass part Titanium white powder 32 Phenylpropyl resin A 13 Ethyl cellulose resin 8 Sodium tripolyphosphate 0.5 Polydimethyl siloxane 0.5 Dimethyl silicone oil 0.5 Stearic trimethyl quaternary ammonium hydrochloride 0.5 Ethyl acetate 10 n-Propyl acetate 18 n-Butyl acetate 11 Isopropyl alcohol 3 Propylene glycol methyl ether acetate 3

[0094] Comparative Example 6

[0095] The raw material composition of the benzene-free and ketone-free heat transfer ink in this example is shown in Table 9 below. The difference between this example and Example 3 is that this example does not contain styrene-acrylic resin and the amounts of ternary hydroxychloroester and cellulose acetate butyrate have been adjusted.

[0096] Table 9. Raw material composition of benzene-free and ketone-free heat transfer inks

[0097]

[0098]

[0099] The inks in Examples 1-3 and Comparative Examples 1-6 were all prepared using the following method:

[0100] After weighing according to the raw material composition of the ink (excluding defoamer and antistatic agent), it is put into a pre-mixing tank for pre-dispersion. Then, the pre-dispersion precursor is transferred to a sand mill with a shaft speed of 1500 r / min, a first grinding flow rate of 4 L / min, and a second grinding flow rate of 6 L / min. 1.0 mm pure zirconia grinding beads are filled at a filling ratio of 60% and ground for 2 hours. The fineness is then tested. After grinding, it is transferred to an adjustment and dispersion tank, where defoamer and antistatic agent are added. After the fineness and other properties are tested and found to be qualified, the material is discharged.

[0101] Performance testing:

[0102] The inks in Examples 1-3 and Comparative Examples 1-6 were tested for their fineness, tinting strength, adhesion, color, initial drying time, and viscosity. The specific test methods are as follows:

[0103] 1. Fineness: Performed in accordance with GB / T13217.3, and the evaluation results are in μm.

[0104] 2. Tinting strength: Performed in accordance with GB / T13217.6, and the evaluation result is expressed as a percentage.

[0105] 3. Adhesion strength: Performed in accordance with GB / T13217.7, and the evaluation results are expressed as a percentage.

[0106] 4. Color: Comply with GB / T13217.1, and the evaluation results are expressed in grades 1-5.

[0107] 5. Initial dryness: The evaluation result is expressed in seconds (S) according to GB / T 13217.5.

[0108] 6. Viscosity: According to GB / T 13217.4, the evaluation result is expressed in units of s.

[0109] The performance of the inks in Examples 1-3 and Comparative Examples 1-6 was tested according to the above test method, and the test results are shown in Table 10.

[0110] Table 10 shows the properties of the inks in Examples 1-3 and Comparative Examples 1-6.

[0111]

[0112] The properties of the inks in Examples 1-3 and Comparative Examples 1-6 were tested in terms of hot stamping temperature, storage stability, and solvent residue. The specific test methods are as follows:

[0113] 1. Hot stamping temperature: Under the premise of clear pattern transfer and good adhesion under the same pressure (0.2PMa), the temperature of the rubber surface of the transfer roller is measured by an infrared thermometer, and the evaluation result is in °C.

[0114] 2. Storage Stability: The ink is subjected to freezing and heating tests for a certain period to observe whether gelation or coarsening occurs. Test Method: Ink samples are placed in a 50℃ self-controlled constant temperature chamber and a -15℃ freezer for 72 hours respectively. After removal, they are stored at room temperature for 3 hours. The viscosity is then compared with that of inks that have not undergone heating and freezing tests, according to the viscosity test method in GB / T 13217.4. The difference in viscosity in seconds is generally used as the evaluation criterion. The heating test evaluates the degree of gelation; the freezing test determines whether the fineness has coarsened. Fineness is determined according to GB / T 13217.3, and the evaluation results are expressed in μm.

[0115] 3. Solvent Residue: An ink sample of a certain area and thickness is prepared and placed in a sealed equilibrium bottle. Under specific time and temperature conditions, the solvent on the surface of the ink sample evaporates. Once equilibrium is reached, the gas from the top of the bottle is measured using a gas chromatograph. The solvent residue per unit area is calculated and expressed in milligrams per square meter (mg / m²). 2 (Refer to QB / T2929-2008). Test the benzene and ketone residues in the ink according to the solvent residue test method.

[0116] The performance of the inks in Examples 1-3 and Comparative Examples 1-6 were tested according to the above test methods, and the test results are shown in Table 11.

[0117] Table 11 shows the properties of the inks in Examples 1-3 and Comparative Examples 1-6.

[0118]

[0119] As shown in Tables 10 and 11, compared with Comparative Examples 1-6, the hot stamping temperature of the inks in Examples 1-3 is lower, with a reduction exceeding 29°C. This means that the inks of this invention have lower energy consumption and cost during heat transfer, significantly reducing production input for enterprises on production lines. Furthermore, the inks of this invention are benzene-free and ketone-free, significantly reducing environmental and health hazards. Compared to ink systems containing benzophenone solvents, the performance of the inks obtained by this invention without using benzophenone solvents is not reduced; in fact, some properties are significantly improved compared to benzophenone-containing inks. Specific analysis is as follows:

[0120] Comparing Examples 1, 1-2, and 3-4, it is evident that the inks prepared by replacing benzophenone solvents with alcohol ester solvents in Comparative Examples 3-4 have higher viscosity, failing to meet the requirements for heat transfer inks. Furthermore, their color, initial drying time, storage stability, and solvent residue are significantly inferior to the benzene-free and benzophenone-free inks of this invention and the benzene-containing and copper-containing inks in Comparative Examples 1-2. This further demonstrates that inks prepared by simply replacing benzophenone solvents with other solvents cannot meet the viscosity requirements for heat transfer inks, exhibiting extremely poor printing performance and reduced other ink properties. Comparing Examples 1 and 5, it is evident that Example 1, by adding ternary hydroxychloroacetic acid resin, significantly improved tinting strength, color, adhesion, and initial drying time, preventing ink roughening and stickiness. Comparing Examples 3 and 6, it is evident that Example 3, by using two styrene-acrylic resins with different degrees of polymerization, significantly reduced ink viscosity, improved adhesion strength, and prevented ink roughening and stickiness.

[0121] In summary, compared with inks containing benzene and ketones, the benzene- and ketone-free ink of this invention retains better fineness, viscosity, and lower solvent residue. It is also free of harmful ketones and benzene solvents, making it more environmentally friendly and safer. This results in heat transfer printed materials being completely odorless, meeting higher requirements. Furthermore, the ink of this invention exhibits excellent storage stability, without becoming coarse or sticky again during long-term storage. It can also significantly reduce the temperature during heat transfer by ≥29°C, significantly reducing energy consumption in mass production and meeting the requirements of energy-saving and environmentally friendly production.

[0122] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A heat transfer ink, characterized in that: The product comprises the following components in parts by weight: 3-15 parts of polymeric material, 6-45 parts of pigment, 0.5-10 parts of additives, and 50-85 parts of solvent. The polymeric material includes chloroacetic acid resins, polymers, and cellulose materials. The chloroacetic acid resin is selected from at least one of ternary hydroxychloroacetic acid resins and ternary carboxylchloroacetic acid resins. The cellulose material is selected from at least one of ester cellulose and ether cellulose. The polymer is selected from polyurethane resin, styrene-acrylic resin, or a combination thereof; The weight-average molecular weight of the styrene-acrylic resin is 50,000 to 100,000. The polyurethane has a weight-average molecular weight of 25,000 to 35,000; the polyurethane resin has a viscosity of 600 to 1400 mPa·s at 25°C. The styrene-acrylic resin has a viscosity of 400~800 mPa·s at 25℃; the acid value of the styrene-acrylic resin is 3~3.5 mgKOH / g; and the glass transition temperature of the styrene-acrylic resin is 50~90℃. The solvent is selected from at least two of ethyl acetate, n-propyl acetate, isopropyl acetate, butyl acetate, isopropanol, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate. The additive comprises the following components in parts by weight: 0.2-3 parts dispersant, 0.2-3 parts leveling agent, 0.2-3 parts defoamer, and 0.2-3 parts stearyltrimethylammonium hydrochloride; or, the additive comprises the following components in parts by weight: 0.2-3 parts dispersant, 0.2-3 parts leveling agent, 0.2-3 parts defoamer, and 0.2-3 parts sodium p-nonylphenoxypropylsulfonate; or, the additive comprises the following components in parts by weight: 0.2-3 parts dispersant, 0.2-3 parts leveling agent, 0.2-3 parts defoamer, and 0.2-3 parts stearyltrimethylammonium hydrochloride and sodium p-nonylphenoxypropylsulfonate.

2. The heat transfer ink according to claim 1, characterized in that: The ester cellulose is selected from at least one of cellulose nitrate, cellulose acetate, cellulose acetate butyrate, and cellulose sulfonate; And / or, the ether cellulose is selected from at least one of methylcellulose, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, cyanoethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose.

3. The heat transfer ink according to claim 1, characterized in that: The dispersant is selected from at least one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, alkyl aryl phosphate, alkylbenzene sulfonate, dialkyl sulfosuccinate, trimethyl stearamide chloride, polyoxyethylene alkylphenol ether, and sorbitol alkylate; And / or, the leveling agent is selected from at least one of polydimethylsiloxane, polyether polyester modified organosiloxane, and alkyl modified organosiloxane; And / or, the defoamer is selected from at least one of polydimethylsiloxane, silicone resin, and emulsified silicone oil.

4. The method for preparing the heat transfer ink according to any one of claims 1 to 3, characterized in that: Includes the following steps: The polymer material, pigment, solvent and some additives are pre-dispersed, then ground, and then mixed with the remaining additives to obtain the final product.

5. The method for preparing thermal transfer ink according to claim 4, characterized in that: In the grinding step, the grinding speed is 500~2000 r / min, and the grinding time is 30~240 min.

6. The method for preparing thermal transfer ink according to claim 4, characterized in that: The additives include dispersants and leveling agents; The remaining additives include defoamer and stearyltrimethylammonium hydrochloride; or, the remaining additives include defoamer and sodium p-nonylphenoxypropylsulfonate; or, the remaining additives include defoamer, stearyltrimethylammonium hydrochloride and sodium p-nonylphenoxypropylsulfonate.

7. The application of the heat transfer ink according to any one of claims 1 to 3 in the printing field.

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