A high-color-yield, low-waste environmentally friendly thickener and its application in printing technology

Abstract

The present invention discloses a high-color-yield, low-waste-gas environmentally friendly thickener and its application in a printing process. The raw materials of the high-color-yield, low-waste-gas environmentally friendly thickener in the present invention include: 30-40 parts of acrylic acid monomer, 1-3 parts of methacrylate urushiol ester monomer, 40-50 parts of neutralizer, 3-5 parts of heavy oil, 20-30 parts of white oil, 1-3 parts of cross-linking agent, 1-2 parts of initiator, 2-3 parts of emulsifier, and 2-3 parts of diverting agent; the emulsifier includes urushiol polyoxyethylene ether and span-80 in a mass ratio of 0.3-0.5:0.7-1.2. The present invention adds urushiol methacrylate ester monomer to copolymerize with acrylic acid monomer, and adds urushiol polyoxyethylene ether to the emulsifier, so that heavy oil and white oil can be used instead of kerosene as the continuous phase during emulsion preparation. The prepared thickener has good thickening and electrolyte resistance while not containing components such as kerosene that have a large pollution to the environment, meeting the needs of printing production.

Description

Technical Field

[0001] The present invention relates to the technical field of printing thickeners, in particular to an environmentally friendly thickener with high color yield and low waste gas, and application thereof in a printing process. Background Art

[0002] Disperse printing uses a thickener and disperse dye to create a color paste, which is then applied to fabric through a screen to fix the pattern. Adding a thickener to the printing paste increases its viscosity, reduces its fluidity, and imparts pseudoplasticity. Under shear forces, the viscosity decreases, allowing it to easily leak through the mesh of the printing screen onto the printed fabric. Once the shear forces are removed, the viscosity increases, allowing the paste to remain in place without seeping into other areas of the fabric. This provides strong anti-seepage properties, ensuring a clear, three-dimensional printed pattern. Therefore, the properties of the thickener determine the printing performance of the printing paste and directly impact the quality of the printed product.

[0003] Natural starch and sodium alginate were initially used as thickeners for printing. However, natural starch pulping is difficult, while sodium alginate is expensive and easily hydrolyzed. Synthetic thickeners, with their advantages of excellent thickening effect, convenient transportation and storage, simple formulation, clear outlines, and bright colors, have replaced natural thickeners. Anionic polyacrylates have the strongest thickening ability among synthetic thickeners to date. Polyacrylate thickeners are now commonly prepared by inverse emulsion polymerization, with kerosene typically used as the emulsifying medium for inverse emulsification. For example, the Chinese patent document "A high-performance disperse printing synthetic thickener and its preparation method", with publication number CN115198543A, includes the following components by weight: 10% to 20% unsaturated acidic monomer, 15% to 30% neutralizer, 0.1% to 0.5% methylene bisacrylamide, 2% to 6% functional monomer, 3% to 6% Span-80, 0.1% to 0.6% sodium bisulfite, 0.1% to 0.6% sodium persulfate, 8% to 15% odorless kerosene, 2% to 5% Tween-80, and the balance is deionized water; the functional monomer is allyl polyoxyethylene ether.

[0004] However, the current synthetic thickeners still have disadvantages such as poor electrolyte resistance, and the kerosene added therein will be emitted in the form of smoke under the high temperature of the printing process, causing certain pollution to the environment. Summary of the Invention

[0005] The first invention object of the present invention is to overcome the above-mentioned problems existing in the thickeners in the prior art, and to provide a high-color-yield, low-waste, environmentally friendly thickener and a preparation method thereof, by adding methacrylate urushiol ester monomer and copolymerizing with acrylic monomer, and adding urushiol polyoxyethylene ether to the emulsifier, so that heavy oil and white oil can be used instead of kerosene as the continuous phase when preparing the emulsion. The prepared thickener does not contain components such as kerosene that have a large impact on the environment, and at the same time has good thickening and electrolyte resistance, meeting the needs of the printing process.

[0006] The second invention purpose of the present invention is to overcome the problem that a large amount of smoke is emitted during printing using the thickener in the prior art, which will cause certain pollution to the environment. A high-color-yield, low-waste gas, environmentally friendly thickener is provided for use in the printing process. The high-color-yield, low-waste gas, environmentally friendly thickener in the present invention that does not contain kerosene is used to prepare a color paste and print. During the printing process, no smoke or other waste gas problems will be generated, and the color yield is high, the permeability is excellent, and problems such as pulling and blocking of the screen will not occur during printing.

[0007] In order to achieve the above-mentioned first invention object, the present invention adopts the following technical solutions:

[0008] A high-color-yield, low-waste, environmentally friendly thickener, comprising, by weight, 30-40 parts of acrylic monomer, 1-3 parts of methacrylate urushiol monomer, 40-50 parts of neutralizer, 3-5 parts of heavy oil, 20-30 parts of white oil, 1-3 parts of cross-linker, 1-2 parts of initiator, 2-3 parts of emulsifier, and 2-3 parts of diverter; the emulsifier comprises urushiol polyoxyethylene ether and span-80 in a mass ratio of 0.3-0.5:0.7-1.2.

[0009] The present invention uses white oil combined with a small amount of heavy oil as the continuous phase when preparing the polyacrylate thickener. Compared with the traditional continuous phase kerosene, the heavy oil and the white oil are not easily volatilized when heated. The prepared thickener is not easy to generate waste gas pollution such as smoke when used in printing production, and has good environmental protection.

[0010] At the same time, in order to ensure that the thickener still has good thickening properties after heavy oil and white oil are used to replace kerosene as the continuous phase, the present invention adds urushiol polyoxyethylene ether as an emulsifier, and adds methacrylate urushiol ester monomer and acrylic monomer for copolymerization. When urushiol polyoxyethylene ether is added as an emulsifier, the urushiol molecular chain in its lipophilic part has good affinity with heavy oil and white oil, which can make the emulsifier have good emulsification properties when heavy oil and white oil are used as the continuous phase, and obtain an emulsion with stable performance. When methacrylate urushiol ester monomer is used to copolymerize with acrylic monomer, on the one hand, the long-chain hydrophobic group brought by urushiol in methacrylate urushiol ester can form a bonded structure between the thickener molecules, which can improve the electrolyte resistance and rheological properties of the thickener; on the other hand, the methacrylate urushiol ester monomer has good affinity with the urushiol polyoxyethylene ether emulsifier, which is conducive to the preparation of the emulsion.

[0011] Therefore, the thickener prepared by the present invention does not contain components such as kerosene that have great environmental pollution, and at the same time has good thickening and electrolyte resistance properties, meeting the needs of the printing process.

[0012] Preferably, the preparation method of the methacrylate urushiol ester monomer is as follows: dissolving urushiol in an organic solvent to obtain an urushiol solution; then adding methacryloyl chloride and triethylamine dropwise to the urushiol solution at 0-4°C; the mass ratio of urushiol, methacryloyl chloride and triethylamine is 5:3-4:3-4; after the dropwise addition is completed, the temperature is raised to 40-45°C, refluxed for 3-5 hours under nitrogen protection, and rotary evaporated to obtain the methacrylate urushiol ester monomer.

[0013] Preferably, the urushiol polyoxyethylene ether is prepared by adding urushiol to an 8-10% by mass sodium hydroxide solution, stirring uniformly, and removing water vapor under reduced pressure; then, adding ethylene oxide under nitrogen protection, reacting at 135-145°C for 4-6 hours, cooling, and neutralizing the product with acetic acid to obtain the urushiol polyoxyethylene ether; the mass ratio of the added urushiol to the ethylene oxide is 30:20-25. By adjusting the addition ratio of urushiol to ethylene oxide, the HLB value of the resulting urushiol polyoxyethylene ether can be adjusted, thereby adjusting the emulsifying properties of the emulsifier. By controlling the amounts of urushiol and ethylene oxide, the present invention can produce an emulsifier with excellent emulsifying properties when combined with span-80 and Tween-80.

[0014] Preferably, the acrylic monomers include acrylic acid, acrylamide, and methacrylic acid in a mass ratio of 20-25:5-10:3-5. The thickener prepared by copolymerizing acrylic acid, acrylamide, and methacrylic acid as acrylic monomers with methacrylate urushiol monomers has good thickening properties, electrolyte resistance, and water-holding capacity, thereby improving the anti-bleeding effect of printing paste.

[0015] Preferably, the neutralizing agent is a NaOH solution with a mass fraction of 20 to 30%.

[0016] Preferably, the cross-linking agent is N,N-methylenebisacrylamide.

[0017] Preferably, the diverting agent is Tween-80.

[0018] Preferably, the initiator is ammonium persulfate.

[0019] The present invention also provides a method for preparing the above-mentioned high-color-yield, low-waste, environmentally friendly thickener, comprising the following steps:

[0020] (1) adding a neutralizing agent to an acrylic acid monomer, stirring the mixture uniformly, and then adding a crosslinking agent to the solution to obtain an aqueous phase;

[0021] (2) mixing heavy oil and white oil uniformly, adding urushiol methacrylate monomer and emulsifier, and stirring uniformly to obtain an oil phase;

[0022] (3) mixing the oil phase and the water phase, and performing high-speed shear emulsification to obtain an emulsion;

[0023] (4) adding an initiator to the emulsion under nitrogen protection, and reacting at 50-60° C. for 3-4 hours; then cooling to 40-45° C., adding a diverter and reacting for 30-40 minutes, and cooling and discharging to obtain the high-color, low-waste, environmentally friendly thickener.

[0024] Preferably, the temperature is controlled not to exceed 40° C. when the neutralizing agent is added to the acrylic monomer in step (1); and the stirring speed during high-speed shearing in step (3) is 1000-1500 r / min, the temperature is 40-50° C., and the stirring time is 30-40 min.

[0025] To achieve the second object of the invention, the present invention provides a method for using the aforementioned high-color-yield, low-waste, environmentally friendly thickener in a printing process. The printing process comprises the following steps: preparing a color paste using the aforementioned high-color-yield, low-waste, environmentally friendly thickener; printing; drying; steaming; and washing. The thickener of the present invention is used in the printing process, and the prepared color paste has a certain viscosity, which facilitates the dispensing of the paste. It also has excellent permeability, and does not cause problems such as stringing and screen clogging during printing. The color paste also has good back penetration, resulting in a high color yield. No waste gas such as smoke is generated during the printing process, thus reducing the use of smoke recovery equipment and achieving the goal of energy conservation and consumption reduction.

[0026] Preferably, the components of the color paste include, by weight: 4 to 5 parts of a high-color-yield, low-waste, environmentally friendly thickener, 3 to 5 parts of a disperse dye, and 85 to 95 parts of water.

[0027] Preferably, the drying temperature is 125-135° C., and the drying time is 2-3 minutes; the steaming temperature is 170-180° C., and the steaming time is 5-7 minutes.

[0028] Therefore, the present invention has the following beneficial effects:

[0029] (1) White oil is used in combination with a small amount of heavy oil as the continuous phase in the preparation of polyacrylate thickeners. Compared with the traditional continuous phase kerosene, heavy oil and white oil are not easily volatilized when heated. The prepared thickener is not easy to generate smoke and other waste gas pollution when used in the printing process, and has good environmental protection.

[0030] (2) Adding urushiol polyoxyethylene ether as an emulsifier can make the emulsifier have good emulsification performance when using heavy oil and white oil as the continuous phase;

[0031] (3) Using methacrylate urushiol monomer and acrylic monomer for copolymerization, on the one hand, methacrylate urushiol can improve the electrolyte resistance and rheological properties of the thickener; on the other hand, methacrylate urushiol monomer and urushiol polyoxyethylene ether emulsifier have good affinity, which is conducive to the preparation of emulsion;

[0032] (4) In the preparation process of urushiol polyoxyethylene ether, the amount of urushiol and ethylene oxide is controlled so that they can be combined with span-80 to obtain an emulsifier with good emulsifying properties;

[0033] (5) By selecting the type and amount of acrylic monomers, the thickener can have good thickening properties, electrolyte resistance and water holding capacity, which can improve the anti-bleeding effect of printing paste. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with specific embodiments.

[0035] In the present invention, unless otherwise specified, the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following examples, unless otherwise specified, are all conventional methods in the art.

[0036] The heavy oil used in the present invention is Xinjiang heavy oil, which has the following properties: relative density 0.8931, freezing point 45°C, fraction below 350°C 13.46%, fraction between 350 and 500°C 28.33%.

[0037] Example 1:

[0038] A method for preparing an environmentally friendly thickener with high color yield and low waste gas comprises the following steps:

[0039] (1) Acrylic acid, acrylamide, and methacrylic acid are mixed in a mass ratio of 22:8:4 to obtain an acrylic monomer; 45 parts by weight of a 25% NaOH solution are added to 35 parts by weight of the acrylic monomer, and the temperature is controlled not to exceed 40° C. during the addition process; after the addition is completed, 2 parts of a crosslinking agent, N,N-methylenebisacrylamide, are added to the solution, and the mixture is stirred uniformly to obtain an aqueous phase;

[0040] (2) 4 parts of heavy oil and 25 parts of 10# white oil were mixed evenly, and 2 parts of methacrylate urushiol monomer, 0.8 parts of urushiol polyoxyethylene ether and 2 parts of span-80 were added; and the oil phase was obtained after stirring evenly;

[0041] The preparation method of the urushiol methacrylate monomer is as follows: dissolving urushiol in petroleum ether to obtain an urushiol solution; then adding methacryloyl chloride and triethylamine dropwise to the urushiol solution under an ice bath; the mass ratio of urushiol, methacryloyl chloride and triethylamine is 5:3.5:3.5; after the dropwise addition is completed, the temperature is raised to 45° C., refluxed for 4 hours under nitrogen protection, and rotary evaporated to obtain the urushiol methacrylate monomer;

[0042] The preparation method of urushiol polyoxyethylene ether comprises the following steps: adding urushiol to a sodium hydroxide solution having a mass fraction of 8%, stirring the mixture uniformly, and removing water vapor under reduced pressure; then adding ethylene oxide under nitrogen protection, wherein the mass ratio of urushiol to ethylene oxide is 30:23; reacting the mixture at 140° C. for 5 hours, cooling the mixture, and neutralizing the mixture with acetic acid to obtain the urushiol polyoxyethylene ether;

[0043] (3) mixing the oil phase and the water phase, and emulsifying them at 45°C and 1200 r / min for 35 min to obtain an emulsion;

[0044] (4) Under nitrogen protection, 1 part of initiator ammonium persulfate was added to the emulsion, and the mixture was reacted at 55° C. for 3 hours; then the temperature was lowered to 40° C., 2.5 parts of diverter Tween-80 were added, and the mixture was reacted for 30 minutes. The mixture was cooled and discharged to obtain the high-color, low-waste, and environmentally friendly thickener.

[0045] Example 2:

[0046] A method for preparing a high-color-yield, low-waste, and environmentally friendly thickener comprises the following steps:

[0047] (1) Acrylic acid, acrylamide, and methacrylic acid are mixed in a mass ratio of 20:10:3 to obtain an acrylic monomer; 40 parts by weight of a 20% NaOH solution are added to 30 parts by weight of the acrylic monomer, and the temperature is controlled not to exceed 40° C. during the addition process; after the addition is completed, 1 part of a cross-linking agent, N,N-methylenebisacrylamide, is added to the solution, and the mixture is stirred uniformly to obtain an aqueous phase;

[0048] (2) 3 parts of heavy oil and 20 parts of 10# white oil were mixed evenly, and 1 part of methacrylate urushiol monomer, 0.6 parts of urushiol polyoxyethylene ether and 1.4 parts of span-80 were added; and the oil phase was obtained after stirring evenly;

[0049] The preparation method of the urushiol methacrylate monomer is as follows: dissolving urushiol in petroleum ether to obtain an urushiol solution; then adding methacryloyl chloride and triethylamine dropwise to the urushiol solution under an ice bath; the mass ratio of urushiol, methacryloyl chloride and triethylamine is 5:3:3; after the dropwise addition is completed, the temperature is raised to 45° C., refluxed for 4 hours under nitrogen protection, and rotary evaporated to obtain the urushiol methacrylate monomer;

[0050] The preparation method of urushiol polyoxyethylene ether comprises the following steps: adding urushiol to a 10% by mass sodium hydroxide solution, stirring uniformly, and removing water vapor under reduced pressure; then adding ethylene oxide under nitrogen protection, wherein the mass ratio of urushiol to ethylene oxide is 30:25; reacting at 145° C. for 4 hours, cooling, and neutralizing the product with acetic acid to obtain the urushiol polyoxyethylene ether;

[0051] (3) mixing the oil phase and the water phase, and emulsifying them at 40°C and 1500 r / min for 30 min to obtain an emulsion;

[0052] (4) Under nitrogen protection, 1 part of initiator ammonium persulfate was added to the emulsion, and the reaction was carried out at 60° C. for 3 hours; then the temperature was lowered to 45° C., 2 parts of diverter Tween-80 were added, and the reaction was carried out for 35 minutes. The material was cooled and discharged to obtain the high-color, low-waste, environmentally friendly thickener.

[0053] Example 3:

[0054] A method for preparing an environmentally friendly thickener with high color yield and low waste gas comprises the following steps:

[0055] (1) acrylic acid, acrylamide, and methacrylic acid are mixed in a mass ratio of 25:5:5 to obtain an acrylic monomer; 50 parts by weight of a 25% NaOH solution are added to 40 parts by weight of the acrylic monomer, and the temperature is controlled not to exceed 40° C. during the addition process; after the addition is completed, 3 parts of a crosslinking agent, N,N-methylenebisacrylamide, are added to the solution, and the mixture is stirred uniformly to obtain an aqueous phase;

[0056] (2) Mix 5 parts of heavy oil and 30 parts of 10# white oil, add 3 parts of methacrylate urushiol monomer, 1 part of urushiol polyoxyethylene ether and 2 parts of span-80; stir well to obtain an oil phase;

[0057] The preparation method of the urushiol methacrylate monomer is as follows: dissolving urushiol in petroleum ether to obtain an urushiol solution; then adding methacryloyl chloride and triethylamine dropwise to the urushiol solution under an ice bath; the mass ratio of urushiol, methacryloyl chloride and triethylamine is 5:4:4; after the dropwise addition is completed, the temperature is raised to 45° C., refluxed for 4 hours under nitrogen protection, and rotary evaporated to obtain the urushiol methacrylate monomer;

[0058] The preparation method of urushiol polyoxyethylene ether comprises the following steps: adding urushiol to a sodium hydroxide solution having a mass fraction of 8%, stirring the mixture uniformly, and removing water vapor under reduced pressure; then adding ethylene oxide under nitrogen protection, wherein the mass ratio of urushiol to ethylene oxide is 30:20; reacting the mixture at 140° C. for 5 hours, cooling the mixture, and neutralizing the mixture with acetic acid to obtain the urushiol polyoxyethylene ether;

[0059] (3) mixing the oil phase and the water phase, and emulsifying them at 40°C and 1500 r / min for 30 min to obtain an emulsion;

[0060] (4) Under nitrogen protection, 2 parts of initiator ammonium persulfate were added to the emulsion, and the mixture was reacted at 50° C. for 4 hours; then the temperature was lowered to 40° C., 3 parts of diverter Tween-80 were added, and the mixture was reacted for 40 minutes. The mixture was cooled and discharged to obtain the high-color, low-waste, and environmentally friendly thickener.

[0061] Comparative Example 1 (no heavy oil added to the continuous phase):

[0062] The difference between Comparative Example 1 and Example 1 is that in step (2), 2 parts of methacrylate urushiol monomer, 0.8 parts of urushiol polyoxyethylene ether and 2 parts of span-80 are added to 29 parts of 10# white oil; and the oil phase is obtained after stirring evenly; the rest is the same as in Example 1.

[0063] Comparative Example 2 (no urushiol polyoxyethylene ether is added to the emulsifier):

[0064] The difference between Comparative Example 2 and Example 1 is that in step (2), 4 parts of heavy oil and 25 parts of 10# white oil are mixed evenly, 2 parts of methacrylate urushiol monomer and 2.8 parts of span-80 are added; and the oil phase is obtained after stirring evenly; the rest is the same as in Example 1.

[0065] Comparative Example 3 (without adding methacrylate urushiol monomer):

[0066] The difference between Comparative Example 3 and Example 1 is that in step (2), 4 parts of heavy oil and 25 parts of 10# white oil are mixed evenly, 0.8 parts of urushiol polyoxyethylene ether and 2 parts of span-80 are added; and the oil phase is obtained after stirring evenly; the rest is the same as in Example 1.

[0067] Comparative Example 4 (changing the ratio of urushiol and ethylene oxide):

[0068] The difference between Comparative Example 4 and Example 1 is that, during the preparation of urushiol polyoxyethylene ether, the mass ratio of urushiol to ethylene oxide is 30:40; the rest is the same as in Example 1.

[0069] The thickening performance, electrolyte resistance and water holding performance of the thickeners prepared in the above examples and comparative examples were tested, and the results are shown in Table 1.

[0070] The thickening performance test method is as follows: the thickeners prepared in the above examples and comparative examples are added to deionized water to prepare a raw paste with a concentration of 1.5 wt %. The viscosity of the raw paste is measured at 25°C using a No. 4 rotor of an NDJ-1 rotary viscometer at a speed of 6 r / min.

[0071] The electrolyte resistance test method is as follows: add 1 wt % NaCl to the 1.5 wt % original paste prepared above, stir evenly, and measure its viscosity retention rate; viscosity retention rate = (viscosity after adding salt / viscosity before adding salt) × 100%.

[0072] The water holding capacity test method is: immerse a 2 cm wide filter paper strip into a 1 cm deep original paste with a concentration of 1.5 wt%, and measure the water penetration height of the filter paper after 30 minutes. The higher the water penetration height, the worse the water holding capacity, and vice versa.

[0073] Table 1: Thickener performance test results.

[0074]

[0075] As can be seen from Table 1, the thickeners prepared by the method of the present invention in Examples 1 to 3 have good thickening properties, electrolyte resistance, and water holding capacity, and the color pastes prepared therefrom can be used for printing with high color yields. However, in Comparative Example 1, only white oil is used as the continuous phase without adding heavy oil, which affects the performance of the emulsion, resulting in a decrease in the thickening, electrolyte resistance, and water holding capacity of the thickener compared to Example 1. In Comparative Example 2, only span-80 is used as the emulsifier, and urushiol polyoxyethylene ether is not added to the emulsifier. The emulsifying ability of the emulsifier is reduced, which also leads to a decrease in various properties of the thickener. In Comparative Example 3, no methacrylate urushiol ester monomer is added for copolymerization with the acrylic monomer, and the electrolyte resistance of the thickener is significantly reduced compared with that in Example 1, and the thickening performance and water holding capacity are also reduced; in Comparative Example 4, the addition ratio of urushiol and ethylene oxide is changed during the preparation of urushiol polyoxyethylene ether, which exceeds the scope of the present invention, and the emulsification properties of the prepared urushiol polyoxyethylene ether are changed, and the emulsification effect on the emulsion is changed, resulting in a decrease in the various properties of the prepared thickener.

[0076] The thickener prepared in the above example was formulated into a printing paste, and its printing quality was tested. The results are shown in Table 2. The paste formulation, by weight, was: 4.5 parts high-color-yield, low-emission, environmentally friendly thickener, 4 parts dispersing dark blue, and 90 parts water. The printing process was as follows: paste preparation → printing → drying (130°C for 2 minutes) → steaming (175°C for 6 minutes) → rinsing.

[0077] Among them, the test method for color fastness to rubbing shall refer to GB / T 3920-2008; the test method for color fastness to water shall refer to GB / T 5713-2013; and the test method for color fastness to light shall refer to GB / T 8427-2019.

[0078] Table 2: Printing color fastness test results.

[0079]

[0080] As can be seen from Table 2, the color pastes prepared using the thickeners in Examples 1 to 3 of the present invention have good color fastness, abrasion resistance and washing resistance after printing.

Claims

1. A high color yield, low waste gas and environmentally friendly thickener, characterized by: The raw materials include, by weight, 30-40 parts of acrylic monomer, 1-3 parts of methacrylate urushiol monomer, 40-50 parts of neutralizer, 3-5 parts of heavy oil, 20-30 parts of white oil, 1-3 parts of crosslinker, 1-2 parts of initiator, 2-3 parts of emulsifier, and 2-3 parts of Tween-80; the emulsifier includes urushiol polyoxyethylene ether and span-80 in a mass ratio of 0.3-0.5:0.7-1.2; The urushiol methacrylate monomer is prepared by the following reaction: dissolving urushiol in an organic solvent; adding methacryloyl chloride and triethylamine dropwise to the urushiol solution at 0-4°C; the mass ratio of urushiol, methacryloyl chloride, and triethylamine is 5:3-4:3-4; after the dropwise addition is complete, heating to 40-45°C, reflux reaction under nitrogen protection for 3-5 hours, and rotary evaporation to obtain the monomer. Urushiol polyoxyethylene ether is prepared by the following reaction: urushiol is added to a NaOH solution with a mass fraction of 8-10%, stirred evenly, and water vapor is removed under reduced pressure; then, ethylene oxide is added under nitrogen protection, reacted at 135-145°C for 4-6 hours, and after cooling, the product is neutralized with acetic acid; the mass ratio of urushiol to ethylene oxide is 30:20-25.

2. The high color yield, low waste gas, environmentally friendly thickener according to claim 1, characterized in that: The preparation method of the methacrylate urushiol ester monomer is as follows: dissolving urushiol in an organic solvent to obtain an urushiol solution; then adding methacryloyl chloride and triethylamine dropwise to the urushiol solution at 0°C; the mass ratio of urushiol, methacryloyl chloride and triethylamine is 5:3.5:3.5; after the dropwise addition is completed, the temperature is raised to 45°C, refluxed for 4 hours under nitrogen protection, and rotary evaporated to obtain the methacrylate urushiol ester monomer.

3. The high color yield, low waste gas, environmentally friendly thickener according to claim 1 or 2, characterized in that: The preparation method of the urushiol polyoxyethylene ether is as follows: adding urushiol to a sodium hydroxide solution with a mass fraction of 8%, stirring evenly, and removing water vapor under reduced pressure; then adding ethylene oxide under nitrogen protection, reacting at 140°C for 5 hours, cooling, and neutralizing the product with acetic acid to obtain the urushiol polyoxyethylene ether; the mass ratio of the added urushiol to the ethylene oxide is 30:

23.

4. The high color yield and low waste gas environmentally friendly thickener according to claim 1, characterized in that: The acrylic monomers include acrylic acid, acrylamide and methacrylic acid in a mass ratio of 20-25:5-10:3-5.

5. The high color yield, low waste gas, environmentally friendly thickener according to claim 1, characterized in that: The neutralizing agent is a NaOH solution with a mass fraction of 20-30%; the cross-linking agent is N,N-methylenebisacrylamide; and the initiator is ammonium persulfate.

6. A method for preparing a high-color-yield, low-waste, environmentally friendly thickener according to any one of claims 1 to 5, characterized in that: The steps include: (1) Adding a neutralizing agent to the acrylic monomer, stirring evenly, and then adding a crosslinking agent to the solution to obtain an aqueous phase; (2) mixing heavy oil and white oil evenly, adding methacrylate urushiol monomer and emulsifier, and stirring evenly to obtain an oil phase; (3) Mixing the oil phase and the water phase, and emulsifying them at high speed to obtain an emulsion; (4) Add an initiator to the emulsion under nitrogen protection, and react at 50-60°C for 3-4 hours; then cool to 40-45°C, add a diverter and react for 30-40 minutes, and cool and discharge to obtain the high-color, low-waste, environmentally friendly thickener.

7. The preparation method according to claim 6, characterized in that: In step (1), when the neutralizing agent is added to the acrylic monomer, the temperature is controlled not to exceed 40° C.; in step (3), the stirring speed during high-speed shearing is 1000-1500 r / min, the temperature is 40-50° C., and the stirring time is 30-40 min.

8. An application of the high-color-yield, low-waste, environmentally friendly thickener according to any one of claims 1 to 5 in a printing process, characterized in that: The steps of the printing process include: preparing color paste using the high-color-yield, low-waste gas and environmentally friendly thickener; printing; drying; steaming; and washing.

9. The use according to claim 8, characterized in that: Calculated by weight, the components of the color paste include: 4 to 5 parts of a high-color-yield, low-waste, environmentally friendly thickener, 3 to 5 parts of a disperse dye, and 85 to 95 parts of water.

10. The use according to claim 8, characterized in that: The drying temperature is 125~135℃, and the drying time is 2~3min; the steaming temperature is 170~180℃, and the steaming time is 5~7min.

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