Coating ink

Abstract

The invention relates to the technical field of ink, in particular to coating ink which comprises the following components in percentage by mass: 20-35% of pigment, 20-35% of pigment, 5-10% of pigment, 5-10% of pigment, 20% to 30% of waterborne polyurethane; 0.5% to 1.5% of a first type of surfactant; 0.2% to 0.5% of a second type of surfactant; 8%-15% of a first solvent; 5%-8% of a second solvent and the balance of water; the first type of surfactant is an anionic gemini type surfactant, the second type of surfactant is selected from at least one of an organosilicon surfactant and a fluorine-containing surfactant, and the mass ratio of the first type of surfactant to the second type of surfactant is (5: 1)-(3: 1); the first solvent is composed of one or more alcohol ether solvents with the relative molecular mass smaller than or equal to 100, and the second solvent is composed of one or more alcohol ether solvents with the relative molecular mass larger than 100. The coating provided by the invention has the advantages of high ink film forming rate, flat printing pressing surface, good printing fluency and good printing quality, and can improve the standby performance of a printer.

Description

Technical Field

[0001] The present invention relates to the technical field of inks, in particular to coating inks. Background Art

[0002] The technology of heat transfer white ink is developing rapidly, and users have higher and higher requirements for product quality, especially requiring products with high hiding power, high brightness and high elasticity. After printing, powdering, shaking, drying and other operations, the pressed surface of commercially available ink is bumpy and has poor paving performance, which seriously affects the tensile elasticity of the printed products. Summary of the invention

[0003] The present application proposes a coating ink, aiming to solve the technical problems mentioned in the above background technology.

[0004] In a first aspect, an embodiment of the present application provides a coating ink, comprising the following components in percentage by weight: Pigment, 20%~35%; Waterborne polyurethane, 20%~30%; Type I surfactant, 0.5%~1.5%; The second type of surfactant, 0.2%~0.5%; Class I solvent, 8%~15%; The second type of solvent, 5% to 8%, and the balance is water; The first type of surfactant is an anionic gemini surfactant, the second type of surfactant is selected from at least one of an organic silicon surfactant and a fluorine-containing surfactant, and the mass ratio of the first type of surfactant to the second type of surfactant is 5:1 to 3:1; The first type of solvent consists of one or more alcohol ether solvents with a relative molecular mass less than or equal to 100, and the second type of solvent consists of one or more alcohol ether solvents with a relative molecular mass greater than 100.

[0005] In some embodiments, the total mass percentage of the first type of surfactant and the second type of surfactant is ≥ 1%.

[0006] In some embodiments, the mass percentage of the second type of solvent is 5% to 6%. In some embodiments, the anionic gemini surfactant includes one or more of phosphate, carboxylate, and sulfonate. In some embodiments, the fluorinated surfactant includes at least one of surfactant FS-50, surfactant FS-6210, surfactant FS-3100, surfactant FS-22, and surfactant FS-3000; and / or, The organosilicon surfactant includes at least one of BYK-438, BYK-342, BYK-333 produced by German BYK Company, and DYNOL-960 and DYNOL-980 produced by Digo Company. In some embodiments, the first type of solvent includes one or more of ethylene glycol, propylene glycol, glycerol, butanol, isopropanol, and the like. In some embodiments, the second type of solvent includes one or more of polyethylene glycol 200, polyethylene glycol 400, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, and sorbitol. In some embodiments, the coating ink further comprises the following components in percentage by mass: bactericide, 0.1% to 0.2%. In some embodiments, the fungicide includes one or more of 2-methyl-4-isothiazolin-3-one and 4,5-dichloro-N-octyl-4-isothiazolin-3-one. In some embodiments, the waterborne polyurethane includes at least one of WPC-101, WPC-TX1, WPC-028, WS-6110, WS-6021, and RA-5300 from Japan Polyurethane Industry, W-6110 from Mitsui Chemicals of Japan, and DL 1606 from Covestro of Germany. Compared with the prior art, this technical solution has at least the following technical effects: The coating ink provided in the present application contains a high relative molecular mass moisturizing solvent - a second type of solvent and an anionic gemini surfactant - a first type of surfactant. Compared with the commonly used acetylene glycol surfactants, the anionic gemini surfactant is more environmentally friendly and has better compatibility with the high relative molecular mass moisturizing solvent. By reasonably proportioning the components in the coating ink, the coating ink printed on the PET film can form a film quickly before sprinkling powder, and can present a smooth pressed surface after sprinkling powder, shaking powder and drying, with good printing smoothness, which can improve the standby performance of the printer. DETAILED DESCRIPTION

[0007] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below.

[0008] It should be clear that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0009] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range or the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges.

[0010] It should be noted that the terms "and / or" or " / " used in this article are merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship. In addition, the singular forms of "a", "said", and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0011] The present application provides a coating ink.

[0012] In an embodiment of the present application, the coating ink includes the following components in mass percentage: pigment, 20-35%; water-based polyurethane, 20-30%; a first type of surfactant, 0.5%~1.5%; a second type of surfactant, 0.2%~0.5%; a first type of solvent, 8-15%; a second type of solvent, 5-8%, and the remainder water; wherein the first type of surfactant is an anionic gemini surfactant, the second type of surfactant is selected from at least one of a silicone surfactant and a fluorine-containing surfactant, and the mass ratio of the first type of surfactant to the second type of surfactant is 5:1~3:1; the first type of solvent is composed of one or more alcohol ether solvents with a relative molecular mass less than or equal to 100, and the second type of solvent is composed of one or more alcohol ether solvents with a relative molecular mass greater than 100.

[0013] The coating ink provided in the present application contains a high relative molecular mass moisturizing solvent - a second type of solvent and an anionic gemini surfactant - a first type of surfactant. Compared with the commonly used acetylene glycol surfactants, the anionic gemini surfactant is more environmentally friendly and has better compatibility with the high relative molecular mass moisturizing solvent. By reasonably proportioning the components in the coating ink, the coating ink printed on the PET film can form a film quickly before sprinkling powder, and can present a smooth pressed surface after sprinkling powder, shaking powder and drying, with good printing smoothness, which can improve the standby performance of the printer.

[0014] In the embodiment of the present application, the mass percentage of the pigment in the coating ink is 20% to 35%, and can be 20%, 23%, 25%, 28%, 30%, 33%, 35% or any value therebetween. Within this mass percentage range, the color density, particle size, stability and jetting reliability of the coating ink all have good performance.

[0015] In the embodiment of the present application, the pigment may be an inorganic pigment or an organic pigment. The inorganic pigment includes a white inorganic pigment, and the organic pigment includes a black organic pigment, a red organic pigment, a yellow organic pigment, a blue organic pigment, and the like.

[0016] In some embodiments, the organic pigment may optionally include at least one of an azo pigment or a polycyclic pigment.

[0017] The azo pigments include at least one of azo lake pigments, insoluble azo pigments, azo condensation pigments and chelated azo pigments. The polycyclic pigments include at least one of phthalocyanine pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments and quinophthalone pigments.

[0018] From the perspective of weather resistance and color saturation, the white inorganic pigment is preferably rutile titanium dioxide particles, such as DuPont titanium dioxide R 902, R 706, and Ishihara titanium dioxide TIPAQUER930.

[0019] In some embodiments, the particle size of the white inorganic pigment is 100nm~500nm, specifically 100nm, 200nm, 300nm, 400nm, 500nm or any value therebetween; preferably, the particle size of the white inorganic pigment is 200nm~300nm. Within this particle size range, the color intensity, surface smoothness and durability of the coating ink are better.

[0020] The black organic pigment is preferably Pigment Black 7, Pigment Black 11 or the like.

[0021] The red or magenta organic pigment is preferably Pigment Violet 19, Pigment Red 122, Pigment Red 146, Pigment Red 176, Pigment Red 184, Pigment Red 185, Pigment Red 202, Pigment Red 207, Pigment Red 209, Pigment Red 254, Pigment Red 269, Pigment Red 282 or the like.

[0022] Preferred yellow organic pigments include pigment yellow 17, pigment yellow 74, pigment yellow 83, pigment yellow 128, pigment yellow 139, pigment yellow 150, pigment yellow 151, pigment yellow 154, pigment yellow 155, pigment yellow 180, pigment yellow 181, pigment yellow 185, pigment yellow 213 and the like.

[0023] The blue organic pigment is preferably pigment blue 15, pigment blue 15:3, pigment blue 15:4, pigment blue 60 or the like.

[0024] In the embodiments of the present application, the mass percentage of the aqueous polyurethane in the coating ink is 20% to 30%, specifically 20%, 22%, 24%, 26%, 28%, 30% or any value therebetween; preferably, the aqueous polyurethane is used as a resin, which exists in the ink in the form of a dispersion.

[0025] In some embodiments, the waterborne polyurethane is selected from one or more of WPC-101, WPC-TX1, WPC-028, WS-6110, WS-6021, and RA-5300 of Japan Polyurethane Industry, and W-6110 of Mitsui Chemicals of Japan and DL 1606 of Covestro of Germany.

[0026] Of course, the waterborne polyurethane may also be other types of waterborne polyurethane commonly used in the art, and this application does not specifically limit this.

[0027] In the embodiments of the present application, in the coating ink, the mass percentage of the first type of surfactant is 0.5% to 1.5%, specifically 0.5%, 0.7%, 0.9%, 1.1%, 1.3% to 1.5% or any value therebetween.

[0028] In the coating ink, the mass percentage of the second type of surfactant is 0.2% to 0.5%, specifically 0.2%, 0.3%, 0.4%, 0.5% or any value therebetween.

[0029] By controlling the mass percentage of the first type of surfactant and the second type of surfactant within the above range, it is beneficial to comprehensively improve the printing smoothness, film-forming performance, tiling performance, tensile elasticity and other properties of the coating ink. If the mass percentage of the first type of surfactant is too large and the mass percentage of the second type of surfactant is too small, the tiling performance and tensile elasticity of the coating ink will be affected, and oil backflow will easily occur. If the mass percentage of the first type of surfactant is too small and the mass percentage of the second type of surfactant is too large, the printing smoothness of the coating graphite will be affected, thereby affecting the standby performance of the printer used for printing with the coating ink.

[0030] In the embodiment of the present application, the mass ratio of the first type of surfactant to the second type of surfactant is 5:1 to 3:1, and can be specifically 5:1, 4.5:1, 4:1, 3.5:1, 3:1 or any value therebetween. Within this ratio range, the first type of surfactant and the second type of surfactant have a good synergistic effect, which is beneficial to comprehensively improve the printing smoothness, film forming performance, tiling performance, tensile elasticity and other properties of the coating ink.

[0031] In the embodiment of the present application, preferably, the total mass percentage of the first type of surfactant and the second type of surfactant is ≥ 1%, specifically 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2% or any value therebetween. Within this total mass percentage range, it is beneficial to improve the printing smoothness of the coating ink.

[0032] In some embodiments, the anionic gemini surfactant includes one or more of phosphate, carboxylate, and sulfonate. Of course, the first type of surfactant may also be selected from other types of anionic gemini surfactants, which are not particularly limited in this application.

[0033] In some embodiments, the fluorinated surfactant includes at least one of surfactant FS-50, surfactant FS-6210, surfactant FS-3100, surfactant FS-22, and surfactant FS-3000. Of course, the fluorinated surfactant may also be other types of fluorinated surfactants, which are not particularly limited in this application.

[0034] In some embodiments, the organosilicon surfactant includes at least one of BYK-438, BYK-342, BYK-333 from BYK of Germany, and DYNOL-960 and DYNOL-980 from DIGAO. Of course, the organosilicon surfactant may also be other types of organosilicon surfactants, which are not particularly limited in the present application.

[0035] In the embodiment of the present application, the mass percentage of the first type of solvent in the coating ink is 8% to 15%, and specifically can be 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15% or any value therebetween.

[0036] In the embodiment of the present application, the first type of solvent is composed of one or more alcohol ether solvents with a relative molecular mass less than or equal to 100. Specifically, the alcohol ether solvents include one or more of alcohol solvents, ether solvents and alcohol-ether solvents (containing both hydroxyl groups and ether bonds).

[0037] In some embodiments, the first type of solvent includes one or more of ethylene glycol, propylene glycol, glycerol, butanol, isopropanol, etc. Of course, the first type of solvent can also be other types of alcohol ether solvents with a relative molecular mass less than or equal to 100, which is not particularly limited in this application.

[0038] In the embodiment of the present application, the mass percentage of the second type of solvent in the coating ink is 5%~8%, specifically 5%, 6%, 7%, 8% or any value therebetween. Preferably, the mass percentage of the second type of solvent in the coating ink is 5%~6%.

[0039] In the coating ink of the present application, the mass percentage of the first type of solvent and the second type of solvent is within the above range, which helps to improve the film-forming rate, tiling performance, tensile elasticity and other properties of the coating ink. If the mass percentage of the first type of solvent is too low and the mass percentage of the second type of solvent is too high, the coating ink will easily have oil backflow; if the mass percentage of the first type of solvent is too high and the mass percentage of the second type of solvent is too low, the coating ink will have a slow film-forming rate, the hot melt powder will have poor tiling performance on the coating ink, and it will be easy to stretch and crack.

[0040] In some embodiments, the second type of solvent includes one or more of polyethylene glycol 200, polyethylene glycol 400, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, and sorbitol. Of course, the second type of solvent can also be other types of alcohol ether solvents with a relative molecular mass greater than 100, which is not particularly limited in this application.

[0041] In the embodiments of the present application, the first type of solvent and the second type of solvent can be purchased from the market, or can be prepared by conventional preparation methods in the art, and the present application does not specifically limit this.

[0042] It should be noted that in the embodiment of the present application, the total mass percentage of each component in the coating ink is 100%. The coating ink may also contain other components, such as: bactericide. In this case, in the coating ink, the total mass percentage of pigment, water-based polyurethane, surfactant system, first-class solvent, second-class solvent and bactericide is 100%.

[0043] In some embodiments, the coating ink further includes the following components in mass percentage: bactericide, 0.1% to 0.2%. Specifically, the mass percentage of the bactericide in the coating ink can be 0.1%, 0.12%, 0.14%, 0.16%, 0.18%, 0.2% or any value therebetween.

[0044] In the above embodiments, the type of bactericide is not particularly limited, and bactericides commonly used in the art can be selected. In some embodiments, the bactericide is selected from one or more of 2-methyl-4-isothiazoline-3-one and 4,5-dichloro-N-octyl-4-isothiazoline-3-one.

[0045] The present application is further described below by specific examples and comparative examples, but the present application is not limited to this specific example. The percentages of the components mentioned above and below in the present application are all mass percentages, and unless otherwise specified, they are all percentages of the components in the total mass of the coating ink.

[0046] 1. Preparation of coating ink 1.1. Raw materials The first type of solvent: diethylene glycol, glycerol, propylene glycol, the second type of solvent: 1,5-hexanediol, 1,5-pentanediol, polyethylene glycol 400, the first type of surfactant: WET511, the second type of surfactant: BYK346, bactericide: MIT, water-based polyurethane: W-6110+DL 1606, pigment: DuPont titanium dioxide R 902, deionized water.

[0047] 1.2. Preparation method Add the first type of solvent and the second type of solvent to deionized water respectively, and stir for 15 to 30 minutes; then add the first type of surfactant and the second type of surfactant, and stir for 15 to 30 minutes; then add water-based polyurethane, and stir for 30 to 60 minutes; then add pigment, and stir for 60 to 120 minutes to obtain a mixed solution; then filter with a 0.6-micron filter membrane to obtain a coating ink.

[0048] 2.1. The formula of each embodiment is shown in Table 1 below: Table 1. Formulations of various examples 2.2. The formulas of the comparative examples are shown in Table 2 below: Table 2. Formulas of various comparative examples 2. Test results of various embodiments and comparative examples Table 3. Test results of various embodiments Table 4. Test results of various comparative examples analyze: By comparing Examples 1-8 with Comparative Examples 1-7, it can be concluded that 5%-8% of a high molecular weight moisturizing solvent (second type solvent) helps the coating ink to dry quickly and form a film, so that the hot melt powder has good tiling performance on the coating ink. If it exceeds 8%, it is easy to oil back, and if it is less than 5%, the film forming rate of the coating ink will be reduced, resulting in poor tiling performance of the hot melt powder on the coating ink, and easy to stretch and crack. When the mass percentage of the first type of surfactant in the coating ink is 0.5%~1.5%, the mass percentage of the second type of surfactant is 0.2%~0.5%, and the mass ratio of the first type of surfactant to the second type of surfactant is 5:1~3:1, it is beneficial to simultaneously improve the printing smoothness and film forming performance of the coating ink. If it is higher than the corresponding ratio, it will lead to poor film forming performance, and if it is lower than the corresponding ratio, it will affect the printing smoothness and cause the printing needle to break.

[0049] Specifically, by comparing Comparative Example 1 with Example 1, it can be concluded that if the content of the first type of solvent is too high, oil backflow may easily occur during printing with the coating ink.

[0050] By comparing Comparative Example 2 with Example 2, it can be concluded that if the content of the second type of solvent is too high, the printing smoothness of the coating ink will be affected.

[0051] By comparing Comparative Example 3 with Example 2, it can be concluded that if the content of the second type of solvent is too low, the laying performance and tensile elasticity of the coating ink will be affected.

[0052] By comparing Comparative Example 4 with Example 3, it can be concluded that if the content of the first type of surfactant is too high, the film-forming performance of the coating ink will be affected.

[0053] By comparing Comparative Example 5 with Example 4, it can be concluded that if the content of the second type of surfactant is too low, it will have a significant impact on the printing smoothness of the coating ink.

[0054] By comparing Comparative Examples 6 and 7 with Example 1, it can be concluded that if the mass percentages of the first type of surfactant and the second type of surfactant are too low or too high, the printing smoothness of the coating ink will be affected.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coating ink, characterized in that: The components include the following mass percentages: Pigment, 20%~35%; Waterborne polyurethane, 20%~30%; Type I surfactant, 0.5%~1.5%; The second type of surfactant, 0.2%~0.5%; Class I solvent, 8%~15%; The second type of solvent, 5% to 8%, and the balance is water; The first type of surfactant is an anionic gemini surfactant, the second type of surfactant is selected from at least one of an organic silicon surfactant and a fluorine-containing surfactant, and the mass ratio of the first type of surfactant to the second type of surfactant is 5:1 to 3:1; The first type of solvent consists of one or more alcohol ether solvents with a relative molecular mass less than or equal to 100, and the second type of solvent consists of one or more alcohol ether solvents with a relative molecular mass greater than 100.

2. The coating ink according to claim 1, characterized in that: The total mass percentage of the first type of surfactant and the second type of surfactant is ≥1%.

3. The coating ink according to claim 1, characterized in that: The mass percentage of the second type of solvent is 5% to 6%.

4. The coating ink according to claim 1, characterized in that: The anionic gemini surfactant includes one or more of phosphate, carboxylate and sulfonate.

5. The coating ink according to claim 1, characterized in that: The fluorine-containing surfactant includes at least one of surfactant FS-50, surfactant FS-6210, surfactant FS-3100, surfactant FS-22, and surfactant FS-3000; and / or, The organosilicon surfactant includes at least one of BYK-438, BYK-342, BYK-333 produced by German BYK Company, and DYNOL-960 and DYNOL-980 produced by Digo Company.

6. The coating ink according to claim 1, characterized in that: The first type of solvent includes one or more of ethylene glycol, propylene glycol, glycerol, butanol, isopropanol, etc.

7. The coating ink according to claim 1, characterized in that: The second type of solvent includes one or more of polyethylene glycol 200, polyethylene glycol 400, 1,5-pentanediol, 1,5-hexanediol, 1,6-hexanediol, and sorbitol.

8. The coating ink according to claim 1, characterized in that: The coating ink further includes a fungicide, which includes one or more of 2-methyl-4-isothiazoline-3-one and 4,5-dichloro-N-octyl-4-isothiazoline-3-one.

9. The coating ink according to claim 8, characterized in that: The mass percentage of the bactericide is 0.1%-0.2%.

10. The coating ink according to claim 1, characterized in that: The waterborne polyurethane includes at least one of WPC-101, WPC-TX1, WPC-028, WS-6110, WS-6021, and RA-5300 from Japan Polyurethane Industry, and W-6110 from Japan Mitsui Chemicals and DL 1606 from Germany Covestro.

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