CN109988456A - Environment-friendly textile printing ink and preparation method thereof - Google Patents

Abstract

The invention discloses an environment-friendly textile printing ink, which is prepared from the following raw materials in parts by weight: 26-32 parts of polyurethane connecting material, 38-44 parts of alcohol-soluble color paste, 2-3 parts of antibacterial agent, and 20-30 parts of solvent , 10-12 parts of plasticizer, 1-2 parts of stabilizer, and 4-6 parts of rheological aid; the invention also discloses a preparation method of the environment-friendly textile printing ink. In the present invention, by using polyurethane as the connecting material of the ink, the compound of ethanol, ethyl acetate and water as the solvent of the ink, and adding an antibacterial agent to the ink, the obtained printing ink is energy-saving and environmentally friendly, and has little air pollution, which is in line with modern According to the requirements of environmental protection, the addition of antibacterial agents makes the ink have good antibacterial properties; the mechanical properties and thermal stability of the ink coating can be improved through the micro-mixing of plasticizers, stabilizers and other additives; a stable Good, no color difference, good drying and antibacterial properties of environmentally friendly textile printing ink.

Description

Environment-friendly textile printing ink and preparation method thereof

technical field

The invention belongs to the technical field of textile printing, in particular to an environment-friendly textile printing ink and a preparation method thereof.

Background technique

The process of making various colors of dyes or pigments into color paste and printing them on textiles to form patterns is called textile printing.

Due to the characteristics of textile materials, textile printing processes are divided into screen printing (rotary screen/flat screen), transfer printing and digital printing. Many chemical elements pollute the environment, so it is not environmentally friendly.

The printing process is relatively long, generally including pattern design, pattern making, color paste modulation, printing patterns, drying, post-processing (steaming, washing, finishing) and other processes. Among them, the post-processing process requires the use of chemicals that are more harmful than inks, and also requires high-temperature treatment, which will volatilize the chemicals into the air, threatening the health of employees.

At the same time, bacteria are everywhere. Many of the existing textiles are cotton fabrics or quilted fabrics, which are easy to breed bacteria in a humid environment. If the human body is in close contact with such textiles for a long time, bacteria will become the cause of human disease and threaten the human body. healthy.

Therefore, it is of great significance to develop an environmentally friendly and bacteriostatic textile printing ink.

SUMMARY OF THE INVENTION

The object of the present invention is to provide an environment-friendly textile printing ink and a preparation method thereof. By using polyurethane as the connecting material of the ink, the compound of ethanol, ethyl acetate and water is used as the solvent of the ink, and an antibacterial agent is added in the ink. , The obtained printing ink is energy-saving and environmentally friendly, has little air pollution, and meets the requirements of modern environmental protection. The addition of antibacterial agents makes the ink have good bacteriostatic properties; The mechanical properties and thermal stability of the ink coating are obtained; an environmentally friendly textile printing ink with good stability, good printing stability, no color difference, good drying and antibacterial properties is obtained.

The object of the present invention can be realized through the following technical solutions:

Environmentally friendly textile printing ink is made from the following raw materials by weight: 26-32 parts of polyurethane binder, 38-44 parts of alcohol-soluble color paste, 2-3 parts of antibacterial agent, 20-30 parts of solvent, 10-30 parts of plasticizer 12 parts, 1-2 parts of stabilizer, 4-6 parts of rheology additives;

The environment-friendly textile printing ink is made by the following steps:

Step S1, adding alcohol-soluble color paste and plasticizer into the high-speed dispersing tank, stirring at 2000r/min for 5-6min, to obtain mixture A;

Step S2, adding the solvent into the high-speed dispersion tank, slowly adding the polyurethane linking material under the stirring condition of 1500 r/min, and stirring at 1500 r/min for 10-12 min after adding, to obtain mixture B;

Step S3, mix mixture A and mixture B, put them into a high-speed dispersing tank, stir at 1000r/min for 3-4min, add antibacterial agent, stabilizer and rheology aid in turn under the stirring condition of 1000r/min, and continue to stir after adding Disperse for 20-24min;

Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink.

Further, the plasticizer is a combination of one or more of trioctyl trimellitate, sulfonic acid esters, and triethylene glycol diisocaprylate.

Further, the rheological aid is one or a mixture of modified organic urea solution, castor oil derivative thixotropic agent and amorphous fumed silica.

Further, the solvent is a composite solvent obtained by mixing ethanol, ethyl acetate and water in a mass ratio of 5:3:2.

Further, described alcohol-soluble color paste is prepared by the following method:

According to the solid-liquid ratio of 1g: 3-4mL, add pigment and dehydrated alcohol into the high-speed dispersing tank, and add a wetting and dispersing agent under the stirring condition of 6000 r/min. 4.5%, continue to stir and disperse for 15-18min to form a uniform slurry, and then transfer to a sand mill for grinding until the particle size is less than 5m to obtain an alcohol-soluble color paste.

Further, the polyurethane connecting material is prepared by the following method:

(1) Add isophorone diisocyanate to the flask, feed N ₂ into the flask, under the protection of N ₂ , slowly add polyether glycol dropwise to the flask, and react to -NCO under the constant temperature condition of 86°C The content no longer changes;

(2) cooling the reaction temperature to 65°C, adding 1,4-butanediol and dibutyltin dilaurate, and continuing the constant temperature reaction at 65°C until the -NCO content no longer changes;

(3) the reaction solution is naturally cooled to room temperature to obtain a polyurethane connecting material;

Wherein, the ratio of the amount of isophorone diisocyanate and polyether diol is 1:1, and the addition of 1,4-butanediol and dibutyltin dilaurate is 2-3% of the quality of the reaction mixture .

Further, the antibacterial agent is prepared by the following method:

(1) Add 182mL of deionized water, 6.5g of cinnamon essential oil, 0.13g of sodium dodecylbenzenesulfonate and 0.26g of polyvinyl alcohol into a round-bottomed flask, and emulsify for 20-30min at room temperature and under mechanical stirring conditions of 2000r/min , to obtain a stable emulsion;

(2) The pH of the emulsion was adjusted to 8.5 with 1moL/L NaOH solution, and then 3.3g urea, 8.5g formaldehyde solution with a mass fraction of 36%, 0.36g ammonium chloride and 0.36g m-phenylene were added to the emulsion For diphenol, the solution was slowly heated to 56°C at a heating rate of 1°C/min at a rotational speed of 700r/min, and kept for 4h;

(3) After the reaction, the pH of the reaction solution was adjusted to 7.0 with a 1moL/L HCl solution, the reaction solution was cooled to room temperature, and then subjected to centrifugal suction filtration, and finally dried at room temperature to obtain the antibacterial agent.

The preparation method of environment-friendly textile printing ink comprises the following steps:

Step S1, adding alcohol-soluble color paste and plasticizer into the high-speed dispersing tank, stirring at 2000r/min for 5-6min, to obtain mixture A;

Step S2, adding the solvent into the high-speed dispersion tank, slowly adding the polyurethane linking material under the stirring condition of 1500 r/min, and stirring at 1500 r/min for 10-12 min after adding, to obtain mixture B;

Step S3, mix mixture A and mixture B, put them into a high-speed dispersing tank, stir at 1000r/min for 3-4min, add antibacterial agent, stabilizer and rheology aid in turn under the stirring condition of 1000r/min, and continue to stir after adding Disperse for 20-24min;

Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink.

Beneficial effects of the present invention:

The printing ink of the invention adopts polyurethane as the connecting material, and the polyurethane connecting material is an alcohol-soluble polyurethane connecting material. The environment-friendly dispersing medium of alcohol-soluble polyurethane is energy-saving and environmentally friendly, has little air pollution, and meets the requirements of modern environmental protection; the solvent used is: It is a compound of ethanol, ethyl acetate and water. Ethanol can completely dissolve the polyurethane binder. As a co-solvent, ethyl acetate can not only dissolve the resin and dilute the ink together with ethanol, but also improve the drying rate of the ink and strengthen the ink. Water resistance performance; water as the most environmentally friendly solvent, appropriate addition, not only enhances the environmental protection of the ink, but also reduces the production cost;

In the printing ink of the present invention, an antibacterial agent is added, and the antibacterial agent is cinnamon essential oil microcapsules, and formaldehyde and urea form a wall material urea-formaldehyde resin through a polycondensation reaction, and the cinnamon essential oil is successfully coated in the urea-formaldehyde resin, forming a uniform particle size ( 1-2um), complete and smooth surface microcapsules, after testing, the coating rate of microcapsules reaches 88-90%; cinnamon essential oil is a kind of natural organic antibacterial substance, derived from cinnamon plant, with low boiling point, volatile It can not only reduce the production cost, but also improve the antibacterial efficiency. Because cinnamon essential oil is volatile, if it is directly added to the ink, it will not only be difficult to dissolve, but also reduce the antibacterial property. It is coated to make microcapsules and added to the ink, which can not only improve the compatibility of cinnamon essential oil and the polymer graft material, but also improve its dispersion uniformity in the ink; at the same time, the ink coating layer containing microcapsules A micro-nano structure similar to the surface of lotus leaves is formed, which greatly reduces the surface energy of the coating and makes it difficult for bacteria to effectively attach to the surface. On the other hand, the microcapsules have slow-release properties. Slow release, the release of bacteriostatic active ingredients can reduce the number of surface viable bacteria and achieve excellent bacteriostatic effect;

In the present invention, the pigments in the printing ink are pretreated, and the pigments are pre-dispersed by the wetting and dispersing agent. On the one hand, the dispersion degree of the pigments in the ink can be increased, and the ink with uniform color can be obtained; Under the pretreatment of the dispersant, the pigment particles are dispersed into finer particles, which can be completely covered by the resin and are not easily eluted, and improve the soaping fastness of the ink layer;

In the present invention, by using polyurethane as the connecting material of the ink, the compound of ethanol, ethyl acetate and water as the solvent of the ink, and adding an antibacterial agent to the ink, the obtained printing ink is energy-saving and environmentally friendly, and has little air pollution, which is in line with modern According to the requirements of environmental protection, the addition of antibacterial agents makes the ink have good antibacterial properties; the mechanical properties and thermal stability of the ink coating can be improved through the micro-mixing of plasticizers, stabilizers and other additives; the obtained is a kind of Environmentally friendly textile printing ink with good stability, good printing stability, no color difference, good drying and antibacterial properties.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Environmentally friendly textile printing ink is made from the following raw materials by weight: 26-32 parts of polyurethane binder, 38-44 parts of alcohol-soluble color paste, 2-3 parts of antibacterial agent, 20-30 parts of solvent, 10-30 parts of plasticizer 12 parts, 1-2 parts of stabilizer, 4-6 parts of rheology additives;

The plasticizer is one or more combinations of trioctyl trimellitate, sulfonic acid esters, and triethylene glycol diisooctanoate; trimellitate is a kind of plasticizer with excellent performance. It has the advantages of both monomeric plasticizers and polymeric plasticizers, with low volatility, small migration, resistance to extraction and durability similar to polyester plasticizers, and compatibility, heating and low temperature properties. It is similar to phthalates; sulfonates, such plasticizers have good compatibility, good mechanical properties and weather resistance; triethylene glycol diisooctanoate is a solvent-based cold-resistant plasticizer with excellent properties. Low temperature, durability, oil resistance, UV radiation resistance and antistatic properties, with low viscosity and certain lubricity;

The rheological aid is one or a mixture of modified organic urea solution, castor oil derivative thixotropic agent and amorphous fumed silica;

The stabilizer is Zn/Sn composite stabilizer;

The solvent is a compound solvent obtained by mixing ethanol, ethyl acetate and water according to a mass ratio of 5:3:2; ethanol can completely dissolve the polyurethane binder, and ethyl acetate, as a co-solvent, can not only dissolve together with ethanol Resin, diluting ink, and can also improve the drying rate of ink and enhance the water resistance of ink; water, as the most environmentally friendly solvent, appropriate addition not only enhances the environmental protection of ink, but also reduces production costs;

The alcohol-soluble color paste is prepared by the following method:

According to the solid-liquid ratio of 1g: 3-4mL, add pigment and absolute ethanol into the high-speed dispersing tank, and add wetting and dispersing agent under the stirring condition of 6000r/min, wherein, the amount of wetting and dispersing agent added is the mass of the pigment. 4.5% of the powder, continue to stir and disperse for 15-18 min to form a uniform slurry, and then transfer to a sand mill for grinding until the particle size is less than 5 m to obtain an alcohol-soluble color paste;

Wherein, the pigment is any one of titanium dioxide, benzidine yellow, phthalocyanine blue, Lisol Baohong and carbon black; the wetting and dispersing agent is DS-960 wetting and dispersing agent;

Pre-dispersing the pigment by wetting and dispersing agent, on the one hand, can increase the dispersion degree of the pigment in the ink and obtain ink with uniform color; on the other hand, under the pretreatment of the wetting and dispersing agent, the pigment particles are dispersed into finer The particles can be completely covered by resin and not easy to be washed out, which improves the soaping fastness of the ink layer;

The polyurethane connecting material is prepared by the following method:

(1) Add isophorone diisocyanate to the flask, feed N ₂ into the flask, under the protection of N ₂ , slowly add polyether glycol dropwise to the flask, and react to -NCO under the constant temperature condition of 86°C The content no longer changes;

(2) cooling the reaction temperature to 65°C, adding 1,4-butanediol and dibutyltin dilaurate, and continuing the constant temperature reaction at 65°C until the -NCO content no longer changes;

(3) the reaction solution is naturally cooled to room temperature to obtain a polyurethane connecting material;

Wherein, the ratio of the amount of isophorone diisocyanate and polyether diol is 1:1, and the additions of 1,4-butanediol and dibutyltin dilaurate are isophorone diisocyanate, polyether 2-3% of the mass of the glycol mixture;

The obtained polyurethane binder is an alcohol-soluble polyurethane binder, and the environment-friendly alcohol-soluble polyurethane dispersion medium is energy-saving and environmentally friendly, has little air pollution, and meets the requirements of modern environmental protection;

The antibacterial agent is prepared by the following method:

(1) Add 182mL of deionized water, 6.5g of cinnamon essential oil, 0.13g of sodium dodecylbenzenesulfonate and 0.26g of polyvinyl alcohol into a round-bottomed flask, and emulsify for 20-30min at room temperature and under mechanical stirring conditions of 2000r/min , to obtain a stable emulsion;

(2) The pH of the emulsion was adjusted to 8.5 with 1moL/L NaOH solution, and then 3.3g urea, 8.5g formaldehyde solution with a mass fraction of 36%, 0.36g ammonium chloride and 0.36g m-phenylene were added to the emulsion For diphenol, the solution was slowly heated to 56°C at a heating rate of 1°C/min at a rotational speed of 700r/min, and kept for 4h;

(3) adjust the pH of the reaction solution to 7.0 with the HCl solution of 1moL/L after the reaction is completed, carry out centrifugal suction filtration after the reaction solution is cooled to room temperature, and finally dry at room temperature to obtain the antibacterial agent;

Sodium dodecylbenzene sulfonate is used as surfactant and polyvinyl alcohol is used as cosurfactant. When the stability of the emulsion decreases, sodium dodecylbenzene sulfonate is easily desorbed from the surface of the core material, while polyvinyl alcohol is relatively The larger molecular weight can increase the viscosity of the continuous phase, make the reaction system form a barrier, and can effectively prevent the coalescence and rupture of emulsified oil droplets, and the combination of the two can achieve excellent emulsification effect;

Formaldehyde and urea undergo a polycondensation reaction to form a wall material urea-formaldehyde resin. Cinnamon essential oil is successfully encapsulated in the urea-formaldehyde resin to form microcapsules with uniform particle size (1-2um), complete and smooth surface. The coverage rate reaches 88-90%; cinnamon essential oil is a kind of natural organic antibacterial substance, which is derived from the cinnamon plant. It has the characteristics of low boiling point and easy volatility. When it is applied to antibacterial ink, it can not only reduce the production cost, but also reduce the production cost. To improve the antibacterial efficiency, because the cinnamon essential oil is volatile, if it is directly added to the ink, it will not only be difficult to dissolve, but also reduce the antibacterial property. The compatibility with the polymer graft material improves its dispersion uniformity in the ink; at the same time, the introduction of the ink coating containing microcapsules forms a micro-nano structure similar to the surface of the lotus leaf, which greatly reduces the surface energy of the coating. It is difficult for bacteria to effectively attach to the surface; on the other hand, the microcapsules have slow-release properties. The cinnamon essential oil wrapped by the microspheres is slowly released with the hydrolysis of the urea-formaldehyde resin. The release of bacteriostatic active ingredients can reduce the number of surface viable bacteria and achieve Excellent bacteriostatic effect;

The preparation method of environment-friendly textile printing ink comprises the following steps:

Step S1, adding alcohol-soluble color paste and plasticizer into the high-speed dispersing tank, stirring at 2000r/min for 5-6min, to obtain mixture A;

Step S2, adding the solvent into the high-speed dispersion tank, slowly adding the polyurethane linking material under the stirring condition of 1500 r/min, and stirring at 1500 r/min for 10-12 min after adding, to obtain mixture B;

Step S3, mix mixture A and mixture B, put them into a high-speed dispersing tank, stir at 1000r/min for 3-4min, add antibacterial agent, stabilizer and rheology aid in turn under the stirring condition of 1000r/min, and continue to stir after adding Disperse for 20-24min;

Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink.

Example 1

Environmentally friendly textile printing ink, made from the following raw materials by weight: 26 parts of polyurethane binder, 38 parts of alcohol-soluble color paste, 2 parts of antibacterial agent, 20 parts of solvent, 10 parts of trioctyl trimellitate, Zn/Sn 1 part of composite stabilizer, 4 parts of modified organic urea solution;

The preparation method of environment-friendly textile printing ink comprises the following steps:

Step S1, adding alcohol-soluble color paste and trioctyl trimellitate into the high-speed dispersing tank, and stirring at 2000 r/min for 5 min to obtain mixture A;

Step S2, adding the solvent into the high-speed dispersing tank, slowly adding the polyurethane linking material under the stirring condition of 1500 r/min, and stirring at 1500 r/min for 10 min after adding to obtain mixture B;

Step S3, mix mixture A and mixture B, put them into a high-speed dispersion tank, stir at 1000 r/min for 3 min, and add antibacterial agent, Zn/Sn composite stabilizer and modified organic urea solution in turn under the stirring condition of 1000 r/min, and finish adding Then continue to stir and disperse for 20min;

Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink.

Example 2

The environmentally friendly textile printing ink is made from the following raw materials by weight: 29 parts of polyurethane binder, 41 parts of alcohol-soluble color paste, 2.5 parts of antibacterial agent, 25 parts of solvent, 11 parts of triethylene glycol diisocaprylate, Zn/ 1.5 parts of Sn composite stabilizer, 5 parts of castor oil derivative thixotropic agent;

The preparation method of environment-friendly textile printing ink comprises the following steps:

Step S1, adding alcohol-soluble color paste and triethylene glycol diisocaprylate into a high-speed dispersing tank, stirring at 2000 r/min for 5.5 min, to obtain mixture A;

Step S2, adding the solvent into the high-speed dispersion tank, slowly adding the polyurethane linking material under the stirring condition of 1500 r/min, and stirring at 1500 r/min for 11 min after adding, to obtain mixture B;

Step S3, mix mixture A and mixture B, put into a high-speed dispersion tank, stir at 1000r/min for 3.5min, and add antibacterial agent, Zn/Sn composite stabilizer and castor oil derivative thixotropic agent in turn under the stirring condition of 1000r/min , after adding, continue to stir and disperse for 22min;

Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink.

Example 3

Environmentally friendly textile printing ink is made from the following raw materials by weight: 32 parts of polyurethane binder, 44 parts of alcohol-soluble color paste, 3 parts of antibacterial agent, 30 parts of solvent, 12 parts of trioctyl trimellitate, Zn/Sn 2 parts of composite stabilizer, 6 parts of modified organic urea solution;

The preparation method of environment-friendly textile printing ink comprises the following steps:

Step S1, adding alcohol-soluble color paste and trioctyl trimellitate into the high-speed dispersing tank, stirring at 2000 r/min for 6 min, to obtain mixture A;

Step S2, adding the solvent into the high-speed dispersing tank, slowly adding the polyurethane binder under stirring at 1500 r/min, and stirring at 1500 r/min for 12 min after adding to obtain mixture B;

Step S3, mix mixture A and mixture B, put them into a high-speed dispersion tank, stir at 1000 r/min for 4 min, and add antibacterial agent, Zn/Sn composite stabilizer and modified organic urea solution in turn under the stirring condition of 1000 r/min, after adding Then continue to stir and disperse for 24min;

Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink.

(1) The sample cloth is cut into a rectangular cloth sample of 220×160 mm, the printing ink prepared in Example 1-3 and the commercially available printing ink are scraped on the sample cloth, and then dried: 110 ° C, 3min; 160 ℃, 2min, get the printing sample cloth, do the following performance test on the printing sample cloth:

The rubbing fastness test, according to the national standard GB/T3920-2008 Textile color fastness test, the rubbing fastness test; the soaping fastness test, according to the national standard GB/T3921-2008 Textile color fastness test The color fastness to soaping The test results are as follows:

It can be seen that when the printing ink prepared in Examples 1-3 is printed on textiles, the dry rubbing fastness reaches 3.5 or higher, the wet rubbing fastness reaches 3 or higher, and the soaping fastness reaches 4. Printing ink has good adhesion and mechanical properties on textiles;

(2) respectively take 0.1mL of the printing ink prepared in Example 1-3 and the commercially available ink and drop them on a circular white cardboard sheet with a diameter of 10mm, place the circular sheet on a watch dish covered with bacteria, and place it on an electric heating pad. Incubate in a constant temperature incubator for 24h, set the temperature to 37°C, and then test the diameter (unit: mm) of the sterile area around the circular paper sheet as the diameter of the inhibition zone. The test results are as follows:

Example 1 Example 2 Example 3 Commercial printing ink Escherichia coli 28 26 25 6 Staphylococcus aureus 16 18 17 7 Penicillium 20 twenty one 20 6

It can be known that the antibacterial diameters of the printing ink prepared by the present invention to Escherichia coli, Staphylococcus aureus and Penicillium are respectively 25-28mm, 16-18mm and 20-21mm, when the diameter of the antibacterial circle is greater than 15mm, it can be considered that the antibacterial diameter The bacterial effect is remarkable, indicating that the printing ink prepared by the present invention has good antibacterial performance.

The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (8)

1. environment-friendly textile printing ink is characterized in that, it is made of the following raw materials by weight: 26-32 parts of polyurethane connecting material, 38-44 parts of alcohol-soluble color paste, 2-3 parts of antibacterial agent, 20-30 parts of solvent , 10-12 parts of plasticizer, 1-2 parts of stabilizer, 4-6 parts of rheology additives; The environment-friendly textile printing ink is made by the following steps: Step S1, adding alcohol-soluble color paste and plasticizer into the high-speed dispersing tank, stirring at 2000r/min for 5-6min, to obtain mixture A; Step S2, adding the solvent into the high-speed dispersing tank, slowly adding the polyurethane linking material under the stirring condition of 1500 r/min, and stirring at 1500 r/min for 10-12 min after adding, to obtain mixture B; Step S3, mix mixture A and mixture B, put it into a high-speed dispersion tank, stir at 1000r/min for 3-4min, and add antibacterial agent, stabilizer and rheology aid in turn under the stirring condition of 1000r/min, after adding Continue to stir and disperse for 20-24min; Step S4, the above mixture is then transferred to a sand mill for grinding until the fineness is less than 5 m, to prepare the environment-friendly textile printing ink. 2. environment-friendly textile printing ink according to claim 1, is characterized in that, plasticizer is one or more in trioctyl trimellitate, sulfonic acid esters, triethylene glycol diisocaprylate species composition. 3. environment-friendly textile printing ink according to claim 1, is characterized in that, rheological assistant is a kind of in modified organic urea solution, castor oil derivative thixotropic agent, non-crystalline fumed silica or a mixture of several. 4. The environment-friendly textile printing ink according to claim 1, wherein the solvent is a compound solvent obtained by mixing ethanol, ethyl acetate and water in a mass ratio of 5:3:2. 5. environment-friendly textile printing ink according to claim 1, is characterized in that, described alcohol-soluble color paste is prepared by the following method: According to the solid-liquid ratio of 1g: 3-4mL, add pigment and dehydrated alcohol into the high-speed dispersing tank, and add a wetting and dispersing agent under the stirring condition of 6000 r/min. 4.5%, continue to stir and disperse for 15-18min to form a uniform slurry, and then transfer to a sand mill for grinding until the particle size is less than 5m to obtain an alcohol-soluble color paste. 6. environment-friendly textile printing ink according to claim 1, is characterized in that, described polyurethane connecting material is prepared by the following method: (1) Add isophorone diisocyanate to the flask, feed N ₂ into the flask, under the protection of N ₂ , slowly add polyether glycol dropwise to the flask, and react to -NCO under the constant temperature condition of 86°C The content no longer changes; (2) cooling the reaction temperature to 65°C, adding 1,4-butanediol and dibutyltin dilaurate, and continuing the constant temperature reaction at 65°C until the -NCO content no longer changes; (3) the reaction solution is naturally cooled to room temperature to obtain a polyurethane connecting material; Wherein, the ratio of the amount of isophorone diisocyanate and polyether diol is 1:1, and the addition of 1,4-butanediol and dibutyltin dilaurate is 2-3% of the quality of the reaction mixture . 7. environment-friendly textile printing ink according to claim 1, is characterized in that, described antibacterial agent is prepared by the following method: (1) Add 182mL of deionized water, 6.5g of cinnamon essential oil, 0.13g of sodium dodecylbenzenesulfonate and 0.26g of polyvinyl alcohol into a round-bottomed flask, and emulsify for 20-30min at room temperature and under mechanical stirring conditions of 2000r/min , to obtain a stable emulsion; (2) Adjust the pH of the emulsion to 8.5 with 1moL/L NaOH solution, then add 3.3g urea, 8.5g formaldehyde solution with a mass fraction of 36%, 0.36g ammonium chloride and 0.36g m-phenylene to the emulsion For diphenol, the solution was slowly heated to 56°C at a heating rate of 1°C/min at a rotational speed of 700r/min, and kept for 4h; (3) After the reaction, the pH of the reaction solution was adjusted to 7.0 with 1moL/L of HCl solution, the reaction solution was cooled to room temperature, and subjected to centrifugal suction filtration, and finally dried at room temperature to obtain the antibacterial agent. 8. the preparation method of environment-friendly textile printing ink, is characterized in that, comprises the steps: Step S1, adding alcohol-soluble color paste and plasticizer into the high-speed dispersion tank, stirring at 2000r/min for 5-6min, to obtain mixture A; Step S2, adding the solvent into the high-speed dispersing tank, slowly adding the polyurethane linking material under the stirring condition of 1500r/min, and stirring at 1500r/min for 10-12min after adding, to obtain mixture B; Step S3, mix the mixture A and the mixture B, put it into a high-speed dispersion tank, stir at 1000r/min for 3-4min, and add antibacterial agent, stabilizer and rheology aid in turn under the stirring condition of 1000r/min, and after adding Continue to stir and disperse for 20-24min; In step S4, the above-mentioned mixture is transferred to a sand mill for grinding until the fineness is less than 5 m, so as to obtain the environment-friendly textile printing ink.