阅读说明：本技术 一种热转印色浆及其制备方法 (Thermal transfer printing color paste and preparation method thereof ) 是由 洪羚 于 2020-11-16 设计创作，主要内容包括：本申请涉及一种热转印色浆及其制备方法,其中,所述热转印色浆包括重量百分比的以下组分：分散染料30％～40％、磺化木质素分散剂5％～20％、丙烯酸酯类分散剂10％～15％、有机溶剂5％～15％、消泡剂0.1％～0.2％,杀菌剂0.2％～0.4％及余量的水。本申请提供的热转印色浆,能够提高色浆与墨水配方的兼容性,特别是高浓度墨水,能使得色浆与墨水具有良好的稳定性,并且能够降低色浆粘度,提高所制得的墨水的打印流畅性,并具有良好的稳定性。(The application relates to a thermal transfer printing color paste and a preparation method thereof, wherein the thermal transfer printing color paste comprises the following components in percentage by weight: 30-40% of disperse dye, 5-20% of sulfonated lignin dispersant, 10-15% of acrylate dispersant, 5-15% of organic solvent, 0.1-0.2% of defoaming agent, 0.2-0.4% of bactericide and the balance of water. The application provides a heat-transfer seal mill base can improve mill base and ink formula's compatibility, especially high concentration ink, can make mill base and ink have good stability to can reduce mill base viscosity, improve the printing smoothness nature of the ink that makes, and have good stability.)

1. The heat transfer printing color paste is characterized by comprising the following components in percentage by weight: 30-40% of disperse dye, 5-20% of sulfonated lignin dispersant, 10-15% of acrylate dispersant, 5-15% of organic solvent, 0.1-0.2% of defoaming agent, 0.2-0.4% of bactericide and the balance of water.

2. The thermal transfer paste according to claim 1, wherein the thermal transfer paste has at least one of the following characteristics a-c:

a. the average particle size of the particles in the thermal transfer color paste is 80 nm-140 nm;

b. the viscosity of the thermal transfer color paste is 3.0 cp-5.0 cp;

c. the surface tension of the thermal transfer color paste is 35 mN/m-45 mN/m.

3. The thermal transfer paste of claim 1, wherein the acrylate dispersant comprises at least one of HP-JET200, HP-2409, DISPERBYK-2015, EFKA PA 4401, Dispex Ultra PX 4550, and Dispex Ultra PX 4560.

4. The thermal transfer printing paste according to claim 3, wherein the molecular weight of the acrylate dispersant is 20000 to 25000, and/or the acrylate dispersant is prepared by a controlled polymerization process.

5. The thermal transfer paste according to any one of claims 1 to 4, wherein the organic solvent comprises at least one of ethanol, n-propanol, isopropanol, ethylene glycol, 1, 2-propylene glycol, glycerol, diethylene glycol, triethylene glycol, tetraethylene glycol, sorbitol, polyethylene glycol-400, polyethylene glycol-600, polyethylene glycol-900 and polyethylene glycol-10000.

6. The thermal transfer paste according to any one of claims 1 to 4, wherein the bactericide comprises at least one of BIOBAN BIT-10, BIOBAN BIT-20, Proxel GXL and PROXEL CMG.

7. The thermal transfer paste according to any one of claims 1 to 4, wherein the defoaming agent is at least one selected from Surfynol 104E, Surfynol420, Surfynol440, Surfynol 465, Surfynol 485, BYK-019, BYK-028, FoamStar SI 2250 and AF-103.

8. The thermal transfer paste according to any one of claims 1 to 4, wherein the sulfonated lignin dispersant is at least one selected from the group consisting of EAX907, EAX910, REAX85, AEAX401 and EAX 402.

9. The preparation method of the thermal transfer printing color paste is characterized by comprising the following steps of:

preparing the heat transfer printing color paste raw material according to any one of claims 1 to 8 according to the component proportion;

carrying out coarse grinding on the color paste raw material to ensure that the particle size of particles in the color paste raw material reaches 250-500 nm;

and adding an emulsifier into the color paste raw materials after the coarse grinding, performing fine grinding to enable the particle size of particles in the color paste raw materials to reach 80-140 nm, and filtering to obtain the water-based heat transfer printing color paste finished product.

10. The method according to claim 1, wherein the emulsifier is at least one selected from the group consisting of OP-10, OP-15, OP-21 and OP-30.

Technical Field

The application relates to the technical field of color paste, in particular to thermal transfer printing color paste and a preparation method thereof.

Background

At present, the printing and dyeing industry begins to change from extensive type to fine management, more manufacturers concentrate on the research and development of printing ink and equipment, develop a digital textile printing technology with low pollution, low energy consumption, high precision and personalized customization, and with the continuous innovation of a thermal transfer printing digital process, the market continuously develops a six-head/eight-head thermal transfer printing machine high-speed digital printing machine, and ONE PASS printing becomes a development trend; the requirements on the performance and concentration of digital printing ink in the industrial environment are higher and higher, while the use amount of color paste is high when the color paste with the common concentration of 10-15% is used for preparing high-concentration and high-viscosity ink, and the percentages of other alcohol solvents, surfactants and pure water are limited, so that the stability and the moisture retention of the ink are poor, and the concentration and the viscosity of the ink cannot meet the requirements.

Disclosure of Invention

In view of this, the application provides a thermal transfer printing paste, which can improve the compatibility of the paste and the ink formula, especially a high-concentration ink, can make the paste and the ink have good stability, can reduce the viscosity of the paste, can improve the printing smoothness of the prepared ink, and has good stability.

The embodiment of the application provides a thermal transfer printing color paste, which comprises the following components in percentage by weight: 30-40% of disperse dye, 5-20% of sulfonated lignin dispersant, 10-15% of acrylate dispersant, 5-15% of organic solvent, 0.1-0.2% of defoaming agent, 0.2-0.4% of bactericide and the balance of water.

In one possible embodiment, the thermal transfer paste has at least one of the following characteristics a to c:

a. the average particle size of the particles in the thermal transfer color paste is 80 nm-140 nm;

b. the viscosity of the thermal transfer color paste is 3.0 cp-5.0 cp;

c. the surface tension of the thermal transfer color paste is 35 mN/m-45 mN/m.

In one possible embodiment, the acrylate dispersant comprises at least one of HP-JET200, HP-2409, DISPERBYK-2015, EFKA PA 4401, Dispex Ultra PX 4550, and Dispex Ultra PX 4560.

In one possible embodiment, the molecular weight of the acrylate dispersant is 20000 to 25000, and/or the acrylate dispersant is prepared by a controlled polymerization process.

In one possible embodiment, the organic solvent includes at least one of ethanol, n-propanol, isopropanol, ethylene glycol, 1,2 propylene glycol, glycerol, diethylene glycol, triethylene glycol, tetraethylene glycol, sorbitol, polyethylene glycol-400, polyethylene glycol-600, polyethylene glycol-900, and polyethylene glycol-10000.

In one possible embodiment, the antimicrobial agent includes at least one of BIOBAN BIT-10, BIOBAN BIT-20, Proxel GXL, and PROXEL CMG.

In one possible embodiment, the anti-foaming agent is selected from at least one of Surfynol 104E, Surfynol420, Surfynol440, Surfynol 465, Surfynol 485, BYK-019, BYK-028, FoamStar SI 2250, and AF-103.

In one possible embodiment, the sulfonated lignin dispersant is selected from at least one of EAX907, EAX910, REAX85, AEAX401, and EAX 402.

In a second aspect, an embodiment of the present application provides a method for preparing a thermal transfer color paste, including the following steps:

preparing the thermal transfer printing color paste raw material according to the component proportion;

carrying out coarse grinding on the color paste raw material to ensure that the particle size of particles in the color paste raw material reaches 250-500 nm;

and adding an emulsifier into the color paste raw materials after the coarse grinding, performing fine grinding to enable the particle size of particles in the color paste raw materials to reach 80-140 nm, and filtering to obtain the water-based heat transfer printing color paste finished product.

In one possible embodiment, the emulsifier is selected from at least one of OP-10, OP-15, OP-21 and OP-30.

Detailed Description

While the following is a description of the preferred embodiments of the present invention, it should be noted that those skilled in the art can make various modifications and improvements without departing from the principle of the embodiments of the present invention, and such modifications and improvements are considered to be within the scope of the embodiments of the present invention.

The application provides a heat transfer printing color paste, which comprises the following components in percentage by weight: 30-40% of disperse dye, 5-20% of sulfonated lignin dispersant, 10-15% of acrylate dispersant, 5-15% of organic solvent, 0.1-0.2% of defoaming agent, 0.2-0.4% of bactericide and the balance of water.

According to the formula of the thermal transfer printing color paste, the color paste dosage is lower when high-concentration ink is prepared, and the dosage of the alcohol solvent is higher, so that the coverage rate and the fluency are good when the ink is printed for a long time (ONE PASS), and the standby time of the ink is long and the moisture retention is good; meanwhile, the storage stability at normal temperature and high temperature is long, and no dye is separated out and precipitated.

The disperse dye adopted by the method has the characteristics of high utilization rate, high color saturation OD value, wide solvent compatibility, high color density, high transfer printing rate, strong color reducibility, good storage stability and the like when the added amount of color paste in the prepared ink is small.

The disperse dye can be selected from one or more of disperse blue 56, disperse blue 60, disperse blue 72, disperse blue 359, disperse blue 360, disperse red 19, disperse red 60, disperse yellow 54, disperse yellow 104, disperse yellow 114, disperse orange 25, disperse orange 44, and disperse brown 27.

Alternatively, the weight ratio of the disperse dye in the color paste may be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39% or 40%, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.

Alternatively, the weight ratio of the sulfonated lignin dispersing agent in the color paste may be specifically 5%, 8%, 10%, 12%, 15%, 18% or 20%, but is not limited to the recited values, and other values not recited in the numerical range are also applicable. In particular embodiments, the sulfonated lignin dispersant is preferably one or more of EAX907, EAX910, REAX85, AEAX401, EAX 402.

Optionally, the weight ratio of the acrylate dispersant in the color paste may be 10%, 11%, 12%, 13%, 14% or 15%, but is not limited to the recited values, and other values not recited in the above range are also applicable. Multiple tests show that the addition amount of the acrylate dispersant is less than 10%, the dispersion wettability is poor, the particle size reduction is slow, and the efficiency is low; the addition amount of the acrylate dispersant is higher than 15%, which is beneficial to the color paste to quickly reach a saturated state, the color paste tends to be stable, and the efficiency is high.

In a specific embodiment, the acrylate dispersant comprises at least one of HP-JET200, HP-2409, DISPERBYK-2015, EFKA PA 4401, Dispex Ultra PX 4550, and Dispex Ultra PX 4560.

As an alternative embodiment of the present invention, the molecular weight of the acrylate dispersant is 20000 to 25000, specifically 20000, 20100, 20500, 21000, 22000, 23000, 24000 or 25000, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable. In the embodiment, the acrylate dispersant is a high molecular weight dispersant, and can effectively improve the phenomenon of cake formation of the dye when the dye is dispersed, prevent the dye from caking in the dispersing process, and improve the water solubility. And in the dyeing process, the dispersing agent has good dispersing effect, prevents the dye from aggregating the high molecular weight dispersing agent, can generate low molecular weight polymer, and is beneficial to dispersing the disperse dye into particles with smaller particle size, such as nano-scale dye particles.

Preferably, the acrylate dispersant is prepared by a controlled polymerization technology, such as an acrylate block copolymer, an acrylate graft copolymer, an acrylate gradient copolymer and the like, and has the advantages of high molecular weight, stable molecular structure and high heat resistance, so that the color paste and the ink have good stability.

Optionally, the weight ratio of the organic solvent in the color paste may be specifically 5%, 8%, 9%, 10%, 11%, 12%, 14% or 15%, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.

In a specific embodiment, the organic solvent is an alcohol organic solvent, and may be at least one selected from ethanol, n-propanol, isopropanol, ethylene glycol, 1,2 propylene glycol, glycerol, diethylene glycol, triethylene glycol, tetraethylene glycol, sorbitol, polyethylene glycol-400, polyethylene glycol-600, polyethylene glycol-900, and polyethylene glycol-10000.

Optionally, the weight ratio of the defoaming agent in the color paste can be specifically 0.1%, 0.12%, 0.14%, 0.15%, 0.17%, 0.18%, 0.19% or 0.2%. In particular embodiments, the anti-foaming agent is selected from at least one of Surfynol 104E, Surfynol420, Surfynol440, Surfynol 465, Surfynol 485, BYK-019, BYK-028, FoamStar SI 2250, and AF-103.

Optionally, the weight ratio of the bactericide in the color paste may be specifically 0.2%, 0.22%, 0.24%, 0.25%, 0.3%, 0.32%, 0.35%, 0.38%, or 0.4%. In particular embodiments, the antimicrobial agent includes at least one of BIOBAN BIT-10, BIOBAN BIT-20, Proxel GXL, and PROXEL CMG.

The balance of water can be at least one of tap water, deionized water and distilled water, and preferably, the water is deionized water, so that impurities in the color paste can be reduced, and the influence on other components in the color paste can also be reduced.

As an optional technical solution in the present application, the viscosity of the thermal transfer color paste is 3.0cp to 5.0cp, specifically 3.0cp, 3.2cp, 3.5cp, 3.8cp, 4.0cp, 4.2cp, 4.5cp, 4.8cp or 5.0cp, but is not limited to the enumerated values, and other unrecited values in the numerical value range are also applicable. The viscosity of the thermal transfer color paste is controlled within the above range, so that when high-concentration and high-viscosity ink is prepared, the viscosity of the ink can be reduced, and the smoothness of the ink can be improved.

As an alternative embodiment of the present application, the surface tension of the thermal transfer paste is 35mN/m to 45mN/m, specifically 35mN/m, 36mN/m, 37mN/m, 38mN/m, 39mN/m, 40mN/m, 42mN/m, or 45mN/m, but the present invention is not limited to the recited values, and other values not recited in the numerical range are also applicable. The smoothness of the thermal transfer color paste can be improved by controlling the surface tension of the thermal transfer color paste within the above range.

As an optional technical scheme of the application, the average particle size of the particles in the thermal transfer color paste is 80 nm-140 nm; specifically, it may be 80nm, 100nm, 110nm, 115nm, 120nm, 125nm, 130nm, 135nm or 140nm, but the numerical values are not limited to the above-mentioned ones, and other numerical values not shown in the above-mentioned numerical value range are also applicable. The particle size of the particles in the thermal transfer color paste is controlled to be within the above range, so that the surface tension can be controlled to be within the above range, and the smoothness of the pigment ink can be improved.

In a second aspect, an embodiment of the present application provides a method for preparing a thermal transfer color paste, including the following steps:

preparing the thermal transfer printing color paste raw material according to the component proportion;

carrying out coarse grinding on the color paste raw material to ensure that the particle size of particles in the color paste raw material reaches 250-500 nm;

and adding an emulsifier into the color paste raw materials after the coarse grinding, performing fine grinding to enable the particle size of particles in the color paste raw materials to reach 80-140 nm, and filtering to obtain the water-based heat transfer printing color paste finished product.

In the coarse grinding process, zirconium beads with the major diameter of 0.6 mm-1.0 mm can be adopted for coarse grinding, and in the fine grinding process, zirconium beads with the minor diameter of 0.15 mm-0.35 mm can be adopted for fine grinding. Illustratively, 0.6mm zirconium beads can be used for coarse grinding, and then 0.15mm zirconium beads can be used for fine grinding, wherein the grinding time and the grinding temperature can be adjusted according to actual conditions until the particle size in the color paste reaches the preset requirements.

Specifically, when preparing the color paste raw material, the acrylate polymer dispersant, the organic solvent, the defoamer, the bactericide and the pure water are mixed and stirred uniformly according to the weight percentage; and adding the sulfonated lignin dispersing agent, stirring until the sulfonated lignin dispersing agent is completely dissolved, and finally adding the disperse dye to uniformly disperse at a high speed to obtain the color paste raw material.

In this embodiment, adopt 0.5 micron's filter to filter during the filtration, can effectively filter the large granule material, improve the homogeneity and the smoothness of mill base.

In one possible embodiment, the emulsifier is selected from at least one of OP-10, OP-15, OP-21 and OP-30. In the embodiment, the emulsifier is added into the fine-ground color paste, and if the emulsifier is added during coarse grinding, more bubbles are generated, the grinding time is increased, and the grinding efficiency is affected, so that the grinding efficiency can be effectively improved by adding the emulsifier into the fine-ground color paste.

In a third aspect, an embodiment of the present application provides a method for preparing a thermal transfer ink, including the following steps:

and mixing and stirring the organic solvent, the surfactant, the preservative and the deionized water uniformly, adding the mixture into the aqueous thermal transfer printing color paste prepared in the second aspect, stirring uniformly, and filtering by using a 0.3 micron filter to obtain the thermal transfer printing ink.

In some embodiments, the organic solvent may be selected from at least one of ethanol, n-propanol, isopropanol, ethylene glycol, 1,2 propylene glycol, glycerol, diethylene glycol, triethylene glycol, tetraethylene glycol, sorbitol, polyethylene glycol-400, polyethylene glycol-600, polyethylene glycol-900, and polyethylene glycol-10000.

In some embodiments, the surfactant is selected from at least one of SURFYNOL 104E, SURFYNOL420, SURFYNOL440, SURFYNOL 465, SURFYNOL 485, DYNOL 604, DYNOL 810, DYNOL 960, DYNOL 980, BYK-346, BYK-348, EFKA 3650, OLFINE EXP 4123, OLFINE EXP 4200, and OLFINE EXP 4300.

The examples of the present application are further illustrated below in various examples. The present embodiments are not limited to the following specific examples. The present invention can be modified as appropriate within the scope of protection.

It should be noted that the percentages of the components mentioned above and below in the present invention are weight percentages, and all the percentages are percentages of the total weight of the pigment ink except for specific indications.

1. Preparation of thermal transfer printing color paste

Examples 1 to 4:

color pastes prepared according to the weight percentage shown in the following table 1 are respectively the examples 1-4, and are obtained by grinding the materials in sections until the average particle size is 80-140 nm and then filtering the materials by a 0.5 micron filter.

TABLE 1

2. Preparation of common color paste

Color pastes prepared according to the weight percentage shown in the following table 2 are integrally ground (0.25-0.35mm zirconium beads are continuously ground) to obtain comparative examples 1-4 which are respectively common black color pastes, common blue color pastes, common red color pastes and common yellow color pastes.

TABLE 2

3. Performance testing

The color pastes prepared in the comparative examples 1 to 4 and the high-concentration black color pastes, the high-concentration blue color pastes, the high-concentration red color pastes and the high-concentration yellow color pastes prepared in the examples 1 to 4 of the application are subjected to viscosity, particle size and other item tests, and the results are shown in the following table 3:

TABLE 3

The high temperature of 7 days in the above table means that the sample is stored in a constant temperature oven at 60 ℃ for 7 days and then taken out, and the sample is placed at room temperature to the recovery room temperature, and then the parameters are measured. Rate of change ═ (high temperature 7 days-normal temperature) ÷ normal temperature

The particle sizes in the above table were measured by a Malvern Zetasizer Nano S90 particle sizer.

According to the data in the table 1-3, the viscosity change rate and the average particle size change rate of the prepared color paste are low at high temperature, and the color paste prepared according to the formula provided by the application has excellent stability at high temperature, can reduce the viscosity of the color paste, improves the printing smoothness of the prepared ink, and has good stability.

4. Preparation of ink

The color paste of the embodiment is prepared into ink by using a universal ink formula, and the standby performance of the ink at a printer nozzle, the color density, the change rate after being placed at normal temperature for 60 days, the precipitation and floating condition after 90 days, the change rate after 60 ℃ and high temperature for 14 days and the printing fluency of the ink are tested. And simultaneously compared with the ink prepared by using the color paste of the comparative example according to the general ink formula, the corresponding results are shown in the following table 4:

TABLE 4

As can be seen from the data in Table 4, the thermal transfer color paste of the present invention has good coverage rate and fluency when printed for a fast and long time (ONE PASS), and has good moisture retention property when the ink is in a long standby time; meanwhile, the storage stability at normal temperature and high temperature is long, and no dye is separated out and precipitated; the color saturation OD value is high, the solvent compatibility is wide, and the color paste in the prepared ink has the characteristics of high color concentration, high transfer printing rate, strong color reducibility, good storage stability and the like when the adding amount of the color paste is small.

Although the present application has been described with reference to preferred embodiments, it is not intended to limit the scope of the claims, and many possible variations and modifications may be made by one skilled in the art without departing from the spirit of the application.