Printing ink for a cold transfer printing process that does not require washing, a cold transfer printing method that does not require washing onto a polyester fabric, a thickener for printing ink for a cold transfer printing process that does not require washing, and a method for producing a thickener for printing ink for a cold transfer printing process that does not require washing

Abstract

Provided are a printing ink for a cold transfer printing process that does not require cleaning, which can omit the post-printing cleaning process and the color fixing process and can obtain great economic and social benefits, and a method of printing on a polyester fabric using the printing ink. 【Solution】A printing ink for a cold transfer printing process that does not require cleaning, comprising a thickener, a disperse dye, an adhesive, a surfactant, a dispersant, and water, wherein the thickener is an aqueous polyurethane thickener having a solid content of 20% - 40%, and the aqueous polyurethane thickener has the following structure, 【Chemical 1】 JPEG2025519298000013.jpg22150m is 8 - 20, n is 15 - 25, and k is 1 - 8

Description

Technical Field

[0001] The present invention relates to a printing ink for a cold transfer printing process that does not require washing, and a method of printing on a polyester fabric using the printing ink. The printing ink and the printing method can enhance the fixing effect of disperse dyes on the polyester fabric, thereby eliminating the need for a washing process after printing and color fixing, and enabling cold transfer printing of disperse dyes without washing.

Background Art

[0002] Printing of fabrics (fibers) is a method of printing various color patterns and designs on fabrics. General printing processes can be classified into direct printing, resist printing, or transfer printing.

[0003] Transfer printing is a kind of application of printing technology to fabrics. However, since the surface of the fabric has irregularities or innumerable pores, it is different from the paper with a flat surface and high density aimed at by the printing industry. Therefore, it is considered difficult to obtain a very fine pattern. Therefore, in the printing process of fabrics, in transfer printing, first, a printing technique is used to print an ink containing a dye on a carrier such as paper to create a patterned paper. Then, a strong pressure is applied to the fabric to temporarily make the surface of the fabric in a flat state, and the pattern of the patterned paper is transferred to the fabric by utilizing the transfer characteristics of the dye under a specific environment.

[0004] The advantages of the transfer printing process are that the pattern is artistic, a pattern with rich layers and a realistic shape can be printed, and the processing process can also be shortened, enabling the factory to respond quickly after receiving an order. Therefore, it has developed rapidly.

[0005] Common transfer printing processes include thermal transfer printing and cold transfer printing. In thermal transfer printing, the sublimation characteristics of disperse dyes are mainly utilized to transfer the dye from paper to fabric. Since disperse dyes have a high affinity for polyester fibers, thermal transfer printing is mainly used for printing polyester fabrics.

[0006] For example, Chinese Patent CN201210055121.7 discloses a sublimation-type water-based gravure printing ink and its manufacturing method.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, the process of thermal transfer printing consumes a lot of energy, requires high-level equipment, and has the problem that other fibers with low heat resistance contained in polyester blended fibers are damaged and become cheaper. Furthermore, it is difficult to overcome the problem of low fastness of thermal transfer printing products.

[0009] Cold transfer printing mainly utilizes the characteristics of the transfer, penetration, reaction cross-linking, and capillary effect of water-based disperse dyes in a wet environment to achieve transfer printing. For example, Chinese Patent CN201210365576.9 discloses a disperse dye ink for cold transfer printing and its application method.

[0010] However, current cold transfer printing still requires washing in order to remove the floating color on the surface and improve the color fastness.

[0011] Specifically, the floating color only stays on the surface of the fiber, does not penetrate well into the fiber, and refers to dye molecules that are not combined with the fiber. In the prior art, the method of removing the floating color to improve the color fastness was limited to washing.

[0012] Because under dyeing conditions, when the dye source is cut off, the single-molecule dyes that have already been adsorbed on the fiber surface and, in the extreme case, those remaining in the dye bath will continue to migrate into the interior of the fiber, and the polar aqueous environment serves as a huge driving force source to push these dye molecules into the non-polar interior of the fiber.

[0013] The method of pushing this dye into the fiber interior to remove the floating color is simple and easy to implement. Therefore, in the prior art, washing is the most commonly used means for removing the floating color. However, the washing process is the main cause of generating wastewater in printing-based dyeing.

[0014] Due to the strict wastewater discharge system implemented by the state, the production capacity of printing and dyeing enterprises is restricted, the cost increases, and the market competitiveness is lost.

Means for Solving the Problem

[0015] A printing ink for a cold transfer printing process that does not require washing, containing a thickener, a disperse dye, an adhesive, a surfactant, a dispersant, and water, wherein the thickener is an aqueous polyurethane thickener with a solid content of 20%-40%, and the aqueous polyurethane thickener has the following structure,

[0016]

Chemical Formula

[0017] Also provided is a cold transfer printing method for polyester fabrics that does not require washing, which includes these printing inks and does not include a washing step for fixing the color. Also, the polyester fabric includes a rotor fabric, a taffeta fabric, a polyester plain weave fabric, a polyester spun fabric, a polyester oxford fabric, and a polyester fleece fabric.

[0018] Further, the thickener of the printing ink for the cold transfer printing process that does not require washing comprises 20% - 40%, especially an aqueous polyurethane thickener with a solid content of 25% - 35%. The aqueous polyurethane thickener has the following composition:

[0019]

Chemical formula

Advantages of the Invention

[0020] Based on the cold transfer printing process of disperse dyes in the prior art, the present invention aims to develop a printing ink for the cold transfer printing process that does not require washing, and a method for printing on polyester fabrics using the printing ink. By using the ink and the printing method, the washing process after printing and color fixation can be omitted, printing wastewater can be reduced, or even zero discharge of wastewater can be achieved, thus obtaining great economic and social benefits.

Brief Description of the Drawings

[0021]

Figure 1

Embodiments for Carrying out the Invention

[0022] On the one hand, the present invention provides a printing ink for a cold transfer printing process that does not require cleaning, which contains a disperse dye, a binder, a surfactant, a dispersant, a thickener, and water. Here, the thickener is an aqueous polyurethane thickener with a solid content of about 20%-40%, preferably about 25%-35%, and the aqueous polyurethane thickener has the following structural composition.

[0023]

Chemical formula

[0024] In this embodiment, in the case of a gravure printing apparatus, in the aqueous polyurethane thickener, m is preferably 8-10, n is preferably 17-18, and k is preferably 3-4. In the case of a flexographic printing apparatus, m is preferably 10-13, n is preferably 18-19, and k is preferably 2-3. In the case of a rotary screen printing apparatus, m is preferably 13-15, n is preferably 19-20, and k is preferably 5-6.

[0025] In this embodiment, the printing ink contains about 1.0%-10.0% of a disperse dye, about 2.0%-6.0% of an adhesive, about 0.5%-2.0% of a surfactant, about 0.5%-2.0% of a dispersant, about 3.0-15.0%, preferably about 5.0-10.0% of a thickener, and the remaining amount of water, based on the total weight of the printing ink.

[0026] The disperse dye is a disperse dye commonly used in the printing field, and examples include medium-temperature SE-type disperse dyes or high-temperature S-type disperse dyes. All disperse dyes are commercially available. For example, medium-temperature SE-type series disperse dyes or high-temperature S-series disperse dyes manufactured by Zhejiang Longsheng Group Co., Ltd., Zhejiang Runtu Co., Ltd., Huntsman, and Dyestar can be mentioned.

[0027] The adhesive is an adhesive commonly used in the printing field and includes, for example, a polyfunctional aziridine adhesive.

[0028] All of the adhesives are commercially available, and examples thereof include, for example, the 9122 adhesive purchased from Hangzhou Yinsheng Chemical Factory, the TF-320 adhesive purchased from Zhejiang Chuanhua Co., Ltd., and the F-321A adhesive.

[0029] The surfactant is a surfactant commonly used in the printing field, for example, an organosilicon-based surfactant, and examples thereof include BYK-378 purchased from BYK Chemie or SF-678 purchased from China Fir Chemical Industry Co., Ltd.

[0030] The dispersant is a dispersant commonly used in the printing field and includes, for example, a naphthalene sulfonic acid derivative series, for example, a formaldehyde condensation polymer of naphthalene sulfonic acid, for example, sodium methylene bisnaphthalene sulfonate (CAS No. 36290-04-7) or sodium polynaphthalene formaldehyde sulfonate (CAS No. 9084-06-4), etc.

[0031] These dispersants are commercially available, and examples thereof include the INVALONDAM dispersant (sodium polynaphthalene formaldehyde sulfonate) purchased from Huntsman Corporation and NNO (sodium methylene bisnaphthalene sulfonate) purchased from Hai'an Petrochemical Factory in Jiangsu Province.

[0032] Here, the thickener is an aqueous polyurethane thickener having a solid content of about 20%-40%, preferably about 25-35%, and the aqueous polyurethane thickener has the following structure.

[0033]

Chemical formula

[0034] The aqueous polyurethane thickener can be prepared, for example, by the prepolymer dispersion method. In one embodiment, the method for preparing the aqueous polyurethane thickener includes the following series of steps.

[0035] In a reaction vessel, at a temperature of about 50°C - 60°C, a mixture of about 24 - 30 parts by weight of dry polycaprolactone glycol solid powder and about 10 - 15 parts by weight of dry polyethylene glycol solid powder is stirred for about 15 - 20 minutes to obtain a uniform mixture.

[0036] About 10 - 14 parts by weight of isophorone diisocyanate is added to the reaction vessel at a stirring speed of about 250 rpm - 300 rpm, the system is heated to about 80°C - 95°C, and the reaction is continued for about 40 minutes - 45 minutes while maintaining the temperature, and then the temperature of the system is lowered to about 75°C - 85°C.

[0037] About 1.3 - 1.5 parts by weight of dimethylolpropionic acid is added to the reaction vessel, the reaction is continued for about 15 - 25 minutes, and then the temperature of the system is lowered to about 45°C - 55°C.

[0038] About 0.8 - 1.2 parts by weight of triethylamine is added to the reaction vessel, the reaction is continued for about 25 - 35 minutes, and after an aqueous polyurethane prepolymer is obtained, the temperature of the system is lowered to about 35°C - 45°C.

[0039] The stirring speed is gradually increased from about 250 - 300 rpm to about 1400 - 1600 rpm, and at the same time, about 169.5 - 183.5 parts by weight of water is gradually added to the aqueous polyurethane prepolymer, and at the same time, an aqueous solution with a mass concentration of about 20 - 30% containing about 1.6 - 2.3 parts by weight of N - acetyl ethylenediamine is continuously dropped, whereby an aqueous polyurethane thickener with a solid content of about 20 - 40% is obtained.

[0040] In one embodiment, the method for preparing the aqueous polyurethane thickener includes the following series of steps.

[0041] In a reaction vessel, a mixture of 27 parts by weight of dry polycaprolactone glycol solid powder and 12 parts by weight of dry polyethylene glycol solid powder is stirred at a temperature of about 55 ± 3 °C for 15 minutes to obtain a uniform mixture.

[0042] Add 10 - 14 parts by weight of isophorone diisocyanate to the reaction vessel, heat the system to 88 ± 3 °C at a stirring speed of 250 - 300 rpm, maintain the temperature, and continue the reaction for 40 minutes. Then, lower the system temperature to 80 °C. Add 1.3 - 1.5 parts by weight of dimethylolpropionic acid to the reaction vessel, continue the reaction for 20 minutes, and then lower the temperature of the system to 50 °C. Add 1 part by weight of triethylamine to the reaction vessel, continue the reaction for 30 minutes to obtain an aqueous polyurethane prepolymer. Then, lower the system temperature to 40 ± 2 °C.

[0043] Gradually increase the stirring speed from 250 - 300 rpm to 1500 rpm, and at the same time, gradually add 169.5 - 183.5 parts by weight of water to the aqueous polyurethane prepolymer, and at the same time, continuously dropwise add an aqueous solution with a mass concentration of 20% containing 2 parts by weight of N - acetyl ethylenediamine to obtain an aqueous polyurethane thickener with a solid content of 30%.

[0044] The purity grades of the isophorone diisocyanate, dimethylolpropionic acid, triethylamine, and N - acetyl ethylenediamine are all above industrial purity. The average molecular weight of the polycaprolactone glycol is about 2000 - 2400 g / mol. The average molecular weight of the polyethylene glycol is about 400 - 1000 g / mol, and the purity grade is above industrial purity. All of these raw materials are commercially available. The specific reaction flow in the above - mentioned preparation method is as follows.

[0045]

Chemical formula

[0046] The water may be distilled water or deionized water.

[0047] Methods for preparing printing inks for cold transfer printing processes that do not require washing are known in the art. For example, the following are some of the preparation methods.

[0048] Put about 3.0 - 15.0% of an aqueous polyurethane thickener with a solid content of 20 - 40% into a container, add about 40 - 60% of water, stir well for about 2 hours to make a thickener paste, and wait.

[0049] Add about 0.5 - 2.0% of a dispersant to an appropriate amount of water and stir well. Next, add about 1.0 - 10.0% of a disperse dye, about 2.0 - 6.0% of an adhesive, and about 0.5 - 2.0% of a surfactant, and stir well to dissolve to obtain a mixed paste.

[0050] Then, mix the mixed paste with the thickener paste, adjust to 100% with water, and stir well to produce a printing ink for a cold transfer printing process that does not require washing.

[0051] The viscosity of the printing ink is usually about 100 - 6000 mPa·s, preferably 150 - 5000 mPa·s.

[0052] In another aspect, the present invention provides a method for performing cold transfer printing that does not require washing on a polyester fabric. This includes the use of the above-described printing ink, and in this method, a washing step for fixing the color is not necessary.

[0053] The polyester fabric is a polyester fabric known in the art that can be printed and dyed with disperse dyes. For example, it includes rotary fabrics, taffeta fabrics, polyester plain woven fabrics, polyester spun fabrics, polyester oxford fabrics, and polyester fleece fabrics, etc.

[0054] Methods of using the printing ink in cold transfer printing are known in the art. For example, a pattern of the printing ink is printed on a transfer carrier via gravure printing, flexographic printing, or rotary screen printing to make a transfer paper (rice paper).

[0055] Here, transfer carriers are widely known in the art and include, for example, printing films, printing papers, transfer blankets, or transfer rubber rollers. Thereafter, the pattern is transferred onto the polyester fabric by laminating the polyester fabric and the transfer carrier together and performing pressure transfer printing,

[0056] Next, the transferred polyester fabric undergoes a color fixation step. For example, the color fixation step is performed through a high-temperature and high-pressure steam or baking process known in the art. Here, the high-temperature and high-pressure steam is usually performed at a high temperature of about 125°C - 135°C and a saturated vapor pressure (2.3 - 3.1 MPa) for about 20 minutes - 40 minutes, and the baking process is usually performed at a temperature of about 180°C - 220°C for 30 seconds - 90 seconds.

[0057] The cold transfer printing method of the present invention described above that does not require washing does not require a washing step for color fixation, so no printing wastewater is generated, printing wastewater can be reduced, or zero drainage can be achieved, which can bring great economic and social benefits.

[0058] Also, in the cold transfer printing method of the present invention, even if the washing step for color fixation is omitted, the washing color fastness of the printed finished product can still reach level 4 or above. The wet rubbing fastness reaches level 4, and the dry rubbing fastness reaches level 4 - 5. The washing color fastness is tested based on the GB / T5713 - 2013 or AATCC61 - 2013 standard method, and the wet rubbing fastness and dry rubbing fastness are tested based on the GB / T3920 - 1997 or AATCC8 - 2016 standard method.

[0059] In another aspect, the present invention provides a thickener for printing ink for a cold transfer printing process that does not require washing. It is an aqueous polyurethane thickener with a solid content of about 20% - 40%, preferably about 25% - 35%. The aqueous polyurethane thickener has the following structure.

[0060] [Chemical formula] Here, m is 8 - 20, especially 8 - 15, n is 15 - 25, especially 17 - 20, and k is 1 - 8, especially 2 - 6.

[0061] The aqueous polyurethane thickener is manufactured by the above method. The aqueous polyurethane thickener is a new type of aqueous polyurethane thickener obtained by prepolymer chain extension modification of polyurethane alone. It does not contain discoloring groups such as halogen groups and sulfonic acid groups, ensures the color controllability of disperse dyes, and has excellent thermal stability, adhesiveness, and storage stability. It is very suitable for use in the disperse dye non - washing printing ink of the present invention.

[0062] By using the aqueous polyurethane thickener, when the disperse dye contacts the polyester fiber during transfer, the adsorption of the disperse dye to the polyester fiber is promoted.

[0063] Thereafter, by the action of pressure transfer printing and chemical potential, the dye molecules in the adsorption layer diffuse into the interior of the fiber through the free volume for dyeing, and the dye contained in the synthetic paste continues to replenish the fiber surface and is adsorbed on the fiber surface.

[0064] For this reason, the whole system maintains a dynamic balance, thereby greatly improving the dyeing effect and color fastness of the dye. Finally, in the cold transfer printing process, there is no need for a washing process to remove floating color and fix the color.

[0065] Examples To further illustrate the present invention using non-limiting examples, it should be noted that these examples should not be considered as limiting the present invention.

[0066] Example 1 In this embodiment, gravure printing is performed using printing paper as a transfer carrier, and the pattern of dark-color printing ink used in a cold transfer printing process that does not require washing is transferred onto a polyester taffeta fabric. The formulation of the dark-color printing ink is as follows. Disperse dye 10.0%; Aqueous polyurethane thickener with 30% solids content 5.0%; Adhesive 6.0%; Surfactant 1.0%; Dispersant 2.0%; Water distilled to 100%

[0067] The disperse dye is a medium-temperature SE-type disperse dye purchased from Huntsman.

[0068] The adhesive is TF-320 adhesive purchased from Zhejiang Transfar Co., Ltd.

[0069] The surfactant is BYK-378 purchased from BYK Chemie.

[0070] The dispersing aid is Huntsman's INVALONDAM. The aqueous polyurethane is as follows.

[0071]

Chemical formula

[0072] The aqueous polyurethane is prepared as follows.

[0073] In a reaction vessel, under a temperature of 55 ± 3 °C, a mixture of 27 parts by weight of dry polycaprolactone glycol (average molecular weight 2000 g / mol) solid powder and 12 parts by weight of dry polyethylene glycol (average molecular weight 400 g / mol) solid powder is stirred for 15 minutes to obtain a uniform mixture.

[0074] Add 10 parts by weight of isophorone diisocyanate to the reaction vessel, heat the system temperature to 88 ± 3 °C under a stirring speed of 250 rpm, maintain this temperature and continue the reaction for 40 minutes, then lower the system temperature to 80 °C.

[0075] Put 1.3 parts by weight of dimethylolpropionic acid into the reaction vessel, continue the reaction for 20 minutes, then lower the system temperature to 50 °C.

[0076] Add 1 part by weight of triethylamine to the reaction vessel, continue the reaction for 30 minutes to obtain an aqueous polyurethane prepolymer, and lower the system temperature to 40 °C.

[0077] Gradually increase the stirring speed from 250 rpm to 1500 rpm, and at the same time, gradually add 183.5 parts by weight of deionized water to the aqueous polyurethane prepolymer, and at the same time, continuously dropwise add a 20% mass concentration aqueous solution containing 2 parts by weight of N-acetyl ethylenediamine to obtain an aqueous polyurethane thickener with a solid content of 30%.

[0078] The infrared spectrum of the obtained aqueous polyurethane thickener is shown in Figure 1.

[0079] The printing ink is formulated as follows.

[0080] Put 5% of the aqueous polyurethane thickener with a solid content of 30% into a container, add 50% distilled water, and stir well for 2 hours to dissolve and prepare a thickener paste.

[0081] Add an appropriate amount of a 2.0% dispersing agent to an appropriate amount of distilled water and mix well. Next, add 10.0% disperse dye, 6.0% adhesive, and 1.0% surfactant, and stir well to dissolve to obtain a mixed paste.

[0082] Mix the above mixed paste with the thickening agent paste, adjust to 100% with water, and stir well to obtain printing ink with a viscosity of 800 mPa·s.

[0083] Print the pattern of the above printing ink on printing paper by gravure printing. Laminate polyester taffeta fabric (specification: 63Dx63D / 160T) and the printing paper, and apply pressure transfer printing together to transfer the above pattern onto the fabric. Then, steam the transferred fabric at a high temperature and high pressure of 125 °C and a saturated vapor pressure of 2.3 MPa for about 35 minutes to fix the color and obtain a completed printed product.

[0084] Next, test the washing color fastness, wet rubbing fastness, and dry rubbing fastness of the printed finished product through the standard methods of AATCC61 - 2013 and AATCC8 - 2016. The results show that the color fastness of the printed final product to washing is level 4 or above. The wet rubbing fastness reaches level 4, and the dry rubbing fastness reaches level 4 - 5.

[0085] Example 2 In this embodiment, a transfer printing film is used as a transfer carrier, and the pattern of a light-colored printing ink used in a cold transfer printing process that does not require washing is transferred onto a polyester Oxford fabric by a flexographic printing device. The formulation of the above light-colored printing ink is as follows. Disperse dye 2.0%; Aqueous polyurethane thickening agent with a solid content of 30% 3.0%; Adhesive 2.0%; Surfactant 0.5%; Dispersing agent 0.5%; Water distilled to 100%.

[0086] The disperse dye is a high-temperature S-type disperse dye purchased from Zhejiang Longsheng Group Co., Ltd. The adhesive is the 9122 adhesive purchased from Hangzhou Yinsheng Chemical Factory. The surfactant is SF-678 purchased from China Fir Chemical Industry Co., Ltd. The dispersion aid is the INVALONDAM dispersant manufactured by Huntsman. The aqueous polyurethane is as follows.

[0087]

Chem.

[0088] The aqueous polyurethane is prepared as follows. In a reaction vessel, a mixture of 27 parts by weight of dry polycaprolactone glycol (average molecular weight 2000 g / mol) solid powder and 12 parts by weight of dry polyethylene glycol (average molecular weight 1000 g / mol) solid powder is stirred for 15 minutes at a temperature of 55 ± 3 °C to obtain a uniform mixture.

[0089] 14 parts by weight of isophorone diisocyanate is put into the reaction vessel, and the system temperature is heated to 88 ± 3 °C at a stirring speed of 250 rpm. After maintaining this temperature and continuing the reaction for 40 minutes, the system temperature is lowered to 80 °C.

[0090] 1.5 parts by weight of dimethylolpropionic acid is added to the reaction vessel, and the reaction is continued for 20 minutes, and then the system temperature is lowered by 5 - 50 °C.

[0091] 1 part by weight of triethylamine is added to the reaction vessel, and the reaction is continued for 30 minutes to obtain an aqueous polyurethane prepolymer, and then the temperature of the system is lowered to 40 ± 2 °C.

[0092] While gradually increasing the stirring speed from 250 rpm to 1500 rpm, 169.5 parts by weight of deionized water is gradually added to the aqueous polyurethane prepolymer, and at the same time, a 20% mass concentration aqueous solution containing 2 parts by weight of N-acetyl ethylenediamine is continuously dropped to obtain an aqueous polyurethane thickener with a solid content of 30%.

[0093] The printing ink is formulated as follows.

[0094] Add 3% of the solid content of 30% aqueous polyurethane thickener to a container, add 50% distilled water, and stir well for 2 hours to dissolve, to prepare a thickener paste.

[0095] After adding 0.5% of a dispersion aid to an appropriate amount of distilled water and stirring well, add 2.0% of a disperse dye, 2.0% of an adhesive, and 0.5% of a surfactant, and stir well to dissolve to obtain a mixed paste.

[0096] Mix the mixed paste and the thickener paste, adjust to 100% with water, stir well, and obtain printing ink for a cold transfer printing process that does not require washing. Its viscosity is 150 mPa·s.

[0097] Print the pattern of the printing ink on a transfer printing film by flexographic printing. Laminate a polyester Oxford fabric (specification: 300 D x 600 D / 90 T) and the transfer printing film, apply a pressure transfer print, transfer the pattern onto the raw fabric, and bake and fix the color of the transferred fabric at 200 °C for about 60 seconds to obtain a finished printed product.

[0098] Next, according to the experimental method described in Example 1, the washing color fastness, wet rubbing fastness, and dry rubbing fastness of the printed finished product were tested.

[0099] The results showed that the color fastness of the printed finished product to washing was 4 levels or more, the wet rubbing fastness reached level 4, and the dry rubbing fastness reached level 4 - 5.

[0100] Example 3 In this embodiment, a transfer rubber roller was used as the transfer carrier, and a rotary screen transfer printing apparatus was used. The pattern of medium - dark color printing ink used in a cold transfer printing process that does not require washing was transferred onto a polyester fleece fabric. The formulation of the medium - dark color printing ink is as follows. Disperse dye 6.0%; 15.0% of an aqueous polyurethane thickener with 30% solids content; 5.0% of an adhesive; 1.5% of a surfactant; 1.0% of a dispersant; 100% deionized water.

[0101] The disperse dye is a medium-temperature SE-type disperse dye purchased from Zhejiang RunTu Co., Ltd. The adhesive is TF-320 adhesive purchased from Zhejiang Transfar Co., Ltd. The surfactant is BYK-378 purchased from BYK-Chemie. The dispersing aid is dispersant NNO purchased from Hai'an Petrochemical Factory in Jiangsu Province. The aqueous polyurethane is as follows.

[0102]

Chemical formula

[0103] The aqueous polyurethane is prepared as follows: In a reaction vessel, at a temperature of 55 ± 3 °C, a mixture of 27 parts by weight of dry polycaprolactone glycol (average molecular weight 2400 g / mol) solid powder and 12 parts by weight of dry polyethylene glycol (average molecular weight 40020 g / mol) solid powder is stirred for 15 minutes to obtain a homogeneous mixture.

[0104] 12 parts by weight of isophorone diisocyanate is added to the reaction vessel, and the temperature of the system is heated to 88 ± 3 °C under a stirring speed of 300 rpm, and the reaction is maintained for 40 minutes, then the temperature of the system is lowered to 80 °C.

[0105] 1.5 parts by weight of dimethylolpropionic acid is added to the reaction vessel, and the reaction is continued for 20 minutes, then the temperature of the system is lowered to 50 °C.

[0106] 1 part by weight of triethylamine is added to the reaction vessel, and the reaction is continued for 30 minutes to obtain an aqueous polyurethane prepolymer, and at this time, the temperature of the system is lowered to 40 ± 2 °C.

[0107] While gradually increasing the stirring speed from 300 rpm to 1500 rpm, 177 parts by weight of deionized water are gradually added to the prepolymer. At the same time, an aqueous solution with a mass concentration of 20% containing 2 parts by weight of N-acetyl ethylenediamine is continuously dropped to obtain an aqueous polyurethane thickener with a solid content of 30%.

[0108] The printing ink is formulated as follows.

[0109] Add 15% of the aqueous polyurethane thickener with a solid content of 30% to a container, add 50% of deionized water, and stir well for 2 hours to dissolve it to prepare a thickener paste.

[0110] Add 1.0% of a dispersion aid to an appropriate amount of distilled water and stir well. Next, add 6.0% of a disperse dye, 5.0% of an adhesive, and 1.5% of a surfactant, and stir well to dissolve them to obtain a mixed paste.

[0111] Mix the mixed paste and the thickener paste, adjust to 100% with water, stir well, and obtain printing ink for a cold transfer printing process that does not require washing. Its viscosity is 6000 mPa·s.

[0112] Using a rotary screen transfer printing device, print the pattern of the printing ink on a transfer rubber roller, bond the transfer rubber roller and a polyester fleece fabric (specification: 75Dx150D / 150T), apply a pressure transfer print together, transfer the pattern to the fabric, and then steam the transferred fabric at a high temperature and high pressure of 130 °C and a saturated vapor pressure of 2.7 MPa for about 20 minutes to fix the color and obtain a completed printed product.

[0113] Next, test the washing color fastness, wet rubbing fastness, and dry rubbing fastness of the printed finished product by the experimental method described in Example 1. The results showed that the color fastness of the printed finished product to washing was 4 levels or above, the wet rubbing fastness reached level 4, and the dry rubbing fastness reached level 4 - 5.

Claims

1. A printing ink for a cold transfer printing process that does not require washing, containing a thickener, a disperse dye, an adhesive, a surfactant, a dispersant, and water, wherein the thickener is an aqueous polyurethane thickener with a solid content of 20% - 40%, and the aqueous polyurethane thickener has the following structure, 【Chemical 1】 m is 8 - 20, n is 15 - 25, and k is 1 - 8 A printing ink for a cold transfer printing process that does not require washing, characterized by the above.

2. The thickener is an aqueous polyurethane thickener with a solid content of 25% - 35% The printing ink according to Claim 1, characterized by the above.

3. m is 8 - 15, n is 17 - 20, and k is 2 - 6 The printing ink according to Claim 1, characterized by the above.

4. The printing ink contains 3.0 - 15.0 thickener The printing ink according to any one of Claims 1 to 3, characterized by the above.

5. The printing ink contains 5.0% - 10.0% thickener The printing ink according to Claim 4, characterized by the above.

6. The printing ink contains 3.0% - 15.0% thickener, 1.0% - 10.0% disperse dye, 2.0% - 6.0% adhesive, 0.5% - 2.0% surfactant, 0.5% - 2.0% dispersant, and the remaining amount of water, based on the total weight of the printing ink The printing ink according to any one of Claims 1 to 3, characterized by the above.

7. Including the printing ink according to any one of Claims 1 to 6, The washing step for fixing the color is not included, A method for cold transfer printing on polyester fabric that does not require washing, characterized by the above.

8. The polyester fabric includes rota fabric, taffeta fabric, polyester plain woven fabric, polyester spun fabric, polyester oxford fabric, and polyester fleece fabric The method according to Claim 7, characterized by the above.

9. The thickener of the printing ink for a cold transfer printing process that does not require washing has 20% - 40%, especially an aqueous polyurethane thickener with a solid content of 25% - 35%. The aqueous polyurethane thickener has the following composition, [Chemical Formula 2] m is 8 - 20, especially 8 - 15, n is 15 - 25, especially 17 - 20, and k is 1 - 8, especially 2 - 6 The thickener of the printing ink for a cold transfer printing process that does not require washing, characterized by the above.

10. In a reaction vessel, at a temperature of 50°C - 60°C, a mixture of 24 - 30 parts by weight of dry polycaprolactone glycol solid powder and 10 - 15 parts by weight of dry polyethylene glycol solid powder is stirred for 15 - 20 minutes to obtain a uniform mixture. Add 10 - 14 parts by weight of isophorone diisocyanate to the reaction vessel, heat the system to 80°C - 95°C at a stirring speed of 250 - 300 rpm, keep the reaction at a constant temperature for 40 - 45 minutes, and then lower the temperature of the system to about 75°C - 85°C. Add 1.3 - 1.5 parts by weight of dimethylolpropionic acid to the reaction vessel, continue the reaction for 15 - 25 minutes, then lower the system temperature to about 45 - 55°C, add 0.8 - 1.2 parts by weight of triethylamine to the reaction vessel, and continue the reaction for 25 - 35 minutes to obtain an aqueous polyurethane prepolymer. Next, lower the system temperature to 35 - 45°C, and at the same time, gradually increase the stirring speed from 250 - 300 rpm to 1400 - 1600 rpm. Gradually add 169.5 - 183.5 parts by weight of water to the aqueous polyurethane prepolymer, and at the same time, continuously dropwise add an aqueous solution with a mass concentration of 20 - 30% containing 1.6 - 2.3 parts by weight of N - acetyl ethylenediamine to obtain the thickener. The method for producing a thickener according to claim 9, characterized in that.

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