A kind of water-based textile coating ink and preparation method thereof

Abstract

The present application relates to the field of textile coating inks, and in particular to a water-based textile coating ink and a preparation method thereof. A water-based textile coating ink comprises the following raw materials in parts by weight: 8-20 parts of water-based polyurethane; 7-16 parts of water-based polyester polyol; 2-8 parts of water-based aliphatic isocyanate curing agent; 0.2-1 parts of polyether siloxane copolymer; 0.1-1 parts of bactericide; 10-40 parts of water-based resin-free color paste; 5-20 parts of solvent; and 30-60 parts of pure water. The present application has the effect of improving the color fastness of water-based textile coating ink.

Description

Technical Field

[0001] The present application relates to the field of textile coating inks, and in particular to a water-based textile coating ink and a preparation method thereof. Background Art

[0002] In the field of textile printing, inkjet printing technology has the characteristics of high product quality, low energy consumption, and zero sewage discharge. It has become the main development direction of the printing field in the future; therefore, the development of inkjet printing inks is a research hotspot in the field of fine chemicals and materials for textiles.

[0003] Among them, water-based direct-jet ink is one of the most widely used inkjet printing inks. Water-based direct-jet ink is a water-based textile coating ink produced by replacing organic solvents with water. Compared with traditional solvent-based inks, water-based textile coating inks have the advantages of being environmentally friendly, safe, non-toxic, and odorless, and have good chemical and optical stability. The sharpness and density of the color when printing are also relatively high. Water-based textile coating inks can be directly applied to various textiles, such as cotton, linen, silk, wool, etc., and patterns and colors can be added to textiles through direct jet printing.

[0004] However, the existing water-based textile coating ink generally has low friction color fastness, which reduces the overall color fastness of the water-based textile coating ink; when the textile is inevitably rubbed during use, it is easy to have serious discoloration. Summary of the invention

[0005] In order to improve the color fastness of water-based textile coating ink, the present application provides a water-based textile coating ink and a preparation method thereof.

[0006] In the first aspect, the present application provides a water-based textile coating ink, which adopts the following technical solution:

[0007] A water-based textile coating ink comprises the following raw materials in parts by weight:

[0008] 8-20 parts of waterborne polyurethane;

[0009] 7-16 parts of water-based polyester polyol;

[0010] 2-8 parts of water-based aliphatic isocyanate curing agent;

[0011] Polyether siloxane copolymer 0.2-1 part;

[0012] 0.1-1 part of fungicide;

[0013] 10-40 parts of water-based resin-free color paste;

[0014] 5-20 parts of the first solvent;

[0015] 30-60 parts of pure water.

[0016] By adopting the above technical scheme, the water-based polyurethane can make the water-based textile coating ink form a durable film on the surface of the fabric, and has good waterproofness, which is beneficial to improving the adhesion of the water-based textile coating ink on the fabric, thereby improving the color fastness and water washing resistance of the water-based textile coating ink; secondly, under the dispersing effect of the water-based polyester polyol, the water-based aliphatic isocyanate curing agent can be evenly dispersed in the coating ink, so as to actively play the curing effect of the water-based aliphatic isocyanate curing agent, improve the curing effect of the coating ink, and then help to further improve the color fastness of the water-based textile coating ink; and the polyester polyol can react with the isocyanate curing agent to form a chemical bond, so that the polyester polyol can react with the isocyanate curing agent to form a chemical bond, so that the polyester polyol can be The dispersing effect of the isocyanate curing agent can be effectively exerted to further improve the curing effect of the isocyanate curing agent. At the same time, the water-based aliphatic isocyanate curing agent has a strong bending effect, which is beneficial to entanglement and cross-linking, thereby effectively improving the connection tightness of the internal structure of the textile coating ink, and achieving further improvement in the color fastness and water washing resistance of the water-based textile coating ink; moreover, under the action of the polyether siloxane copolymer, the surface tension of the coating ink can be reduced, which is beneficial to improve the spraying effect of the coating ink, so as to improve the dyeing and printing effects, and the polyether siloxane copolymer has good compatibility with water-based polyurethane and water-based polyester polyol, thereby further improving the color fastness and water washing resistance of the water-based textile coating ink.

[0017] Preferably, the weight ratio of the waterborne polyurethane, waterborne polyester polyol and waterborne aliphatic isocyanate curing agent is (40-45):(40-45):16.

[0018] By adopting the above technical scheme, the combination of water-based polyurethane, water-based polyester polyol and water-based aliphatic isocyanate curing agent in a specific proportion is conducive to forming a stable cross-linked structure among the three to consolidate the internal structure of the water-based textile coating ink, thereby improving the stability of the internal structure of the coating ink, and further improving the curing effect of the coating ink, thereby achieving further improvement in the color fastness of the water-based textile coating ink, and improving the high temperature resistance.

[0019] Preferably, the water-based polyester polyol is a 2,5-sorbitol-bis-4-hydroxybenzoate modified water-based polyester polyol, the raw materials for preparing the 2,5-sorbitol-bis-4-hydroxybenzoate modified water-based polyester polyol include 2,5-sorbitol-bis-4-hydroxybenzoate, a water-based polyester polyol and a second solvent, and the weight ratio of the 2,5-sorbitol-bis-4-hydroxybenzoate, the water-based polyester polyol and the second solvent is (17-23): (20-30): (60-65).

[0020] By adopting the above technical scheme, under the modification effect of 2,5-disorbitol-bis-4-hydroxybenzoate, the high temperature resistance of the water-based polyester polyol is improved, and the rigid structure of 2,5-disorbitol-bis-4-hydroxybenzoate is beneficial to further consolidate the internal structure of the textile coating ink, so that the water-based textile coating ink can be stably attached to the fabric, thereby achieving further improvement of the water-based textile coating ink's water resistance and high temperature resistance; at the same time, the dispersing effect of 2,5-disorbitol-bis-4-hydroxybenzoate can make the coating ink more evenly dispersed on the fabric to present better dyeing and patterning effects.

[0021] Preferably, the second solvent is glycerol.

[0022] Preferably, the water-based aliphatic isocyanate curing agent is a water-based aliphatic blocked isocyanate curing agent.

[0023] By adopting the above technical scheme and using a water-based aliphatic blocked isocyanate curing agent, the reaction activity of the isocyanate curing agent can be regulated, thereby reducing the reaction of the isocyanate curing agent with water in the water-based textile coating ink system, so as to maintain the stability of the properties of the water-based textile coating ink and extend the service life of the water-based textile coating ink, so that when sprayed on the fabric, the water-based textile coating ink can show a better curing effect. At the same time, by controlling the construction conditions of the spraying, the water-based aliphatic blocked isocyanate curing agent can be unblocked, and the reaction activity of the isocyanate curing agent can be improved, so as to promote the isocyanate curing agent to undergo cross-linking reactions with the water-based polyester polyol and the amino compound on the surface of the fabric, respectively, thereby forming a strong cross-linking structure, significantly improving the curing effect and adhesion of the water-based textile coating ink, and thereby achieving effective improvement of the color fastness, water washing resistance and high temperature resistance of the water-based textile coating ink on the fabric.

[0024] Preferably, the deblocking temperature of the water-based aliphatic blocked isocyanate curing agent is 90-150°C.

[0025] By adopting the above technical scheme, the unblocking temperature of the water-based aliphatic blocked isocyanate curing agent is 90-150°C, which is conducive to stabilizing and regulating the reaction activity of the isocyanate curing agent, thereby achieving the purpose of improving the curing effect and adhesion of the water-based textile coating ink, so as to stably achieve further improvement in the color fastness of the water-based textile coating ink.

[0026] Preferably, the waterborne polyurethane is aliphatic waterborne polyurethane.

[0027] By adopting the above technical scheme, the water-based polyurethane uses aliphatic water-based polyurethane, which is conducive to the cross-linking of molecular chain segments of the water-based polyurethane in the water-based textile coating ink system, thereby allowing the water-based polyurethane to stably exist in the coating ink system, so that the water-based textile coating ink forms a stable and durable film on the surface of the fabric; and the aliphatic water-based polyurethane can also improve the wear resistance of the coating ink, thereby effectively exerting the role of the water-based polyurethane in promoting the improvement of the water-based textile coating ink's water-washing resistance, and stably achieving the improvement of the water-based textile coating ink's water-washing resistance.

[0028] Preferably, the first solvent is selected from one or more of ethylene glycol, glycerol, isopropanol, diethylene glycol, PEG400, PEG600, PEG1000, propylene glycol, 1,5-pentanediol, ethylene glycol butyl ether and diethylene glycol butyl ether.

[0029] By adopting the above technical solution, the above solvent has good compatibility with the water-based textile coating ink, which is beneficial to improving the moisturizing effect of the water-based textile coating ink, so that the coating ink can be better sprayed on the fabric, thereby presenting better dyeing and printing effects.

[0030] Preferably, the fungicide is isothiazolinone.

[0031] In a second aspect, the present application provides a method for preparing a water-based textile coating ink, using the following preparation scheme:

[0032] A method for preparing a water-based textile coating ink comprises the following steps:

[0033] S1. The aqueous polyurethane, aqueous polyester polyol and aqueous aliphatic isocyanate curing agent are stirred and mixed to obtain a first mixed preform;

[0034] S2. The first mixed preform, the polyether siloxane copolymer, the bactericide, the first solvent and pure water are mixed and stirred for 20-30 min to obtain a second mixed preform;

[0035] S3. Adding water-based resin-free color paste to the second mixed preform, stirring and mixing for 20-30min to obtain a coating ink preform;

[0036] S4. Filter the paint ink preform with a filter membrane, collect the filtrate, and obtain a water-based textile paint ink.

[0037] By adopting the above technical scheme, the water-based textile coating ink prepared by the above preparation method has the characteristics of stable structure, which is beneficial to improving the water-based textile coating ink's water-resistant performance and high temperature resistance.

[0038] Preferably, the preparation method of the 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol is: 2,5-disorbitol-bis-4-hydroxybenzoate, waterborne polyester polyol and a second solvent are mixed, heated to 40-50° C., and stirred for 20-30 minutes to obtain 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol.

[0039] By adopting the above technical scheme, the above preparation method is conducive to fully mixing and modifying 2,5-disorbitol-bis-4-hydroxybenzoate with water-based polyester polyol, thereby obtaining 2,5-disorbitol-bis-4-hydroxybenzoate-modified water-based polyester polyol with good dispersibility and stable structure, and having good high temperature resistance, which is conducive to improving the water-based textile coating ink's water-based washing resistance and high temperature resistance.

[0040] Preferably, the stirring speed in step S1 is 1800-2000 r / min.

[0041] By adopting the above technical scheme, the water-based polyurethane, water-based polyester polyol and water-based aliphatic isocyanate curing agent are stirred and mixed at a rotation speed of 1800-2000r / min, which is conducive to fully and evenly mixing the three, so as to effectively promote stable cross-linking between the three, thereby preparing a water-based textile coating ink with a more stable structure, so as to further improve the water-based textile coating ink's water-washing resistance and high temperature resistance.

[0042] In summary, the present application includes at least one of the following beneficial technical effects:

[0043] 1. Through water-based polyurethane, water-based textile coating ink forms a durable film on the surface of the fabric, and has good waterproofness, which is beneficial to improve the adhesion of water-based textile coating ink on the fabric, thereby improving the color fastness and water washing resistance of water-based textile coating ink; secondly, under the dispersing effect of water-based polyester polyol, water-based aliphatic isocyanate curing agent can be evenly dispersed in the coating ink, improving the curing effect of the coating ink, which is beneficial to further improve the color fastness of water-based textile coating ink; and polyester polyol can react with isocyanate curing agent to form chemical bonds, so that the dispersing effect of polyester polyol on isocyanate curing agent can be effectively The curing effect of the isocyanate curing agent can be further improved. At the same time, the water-based aliphatic isocyanate curing agent has a strong bending effect, which is conducive to winding and cross-linking, thereby effectively improving the connection tightness of the internal structure of the textile coating ink, and further improving the color fastness and water washing resistance of the water-based textile coating ink; the polyether siloxane copolymer can reduce the surface tension of the coating ink under the action of the polyether siloxane copolymer, which is conducive to improving the spraying effect of the coating ink, so as to improve the dyeing and printing effects, and the polyether siloxane copolymer has good compatibility with water-based polyurethane and water-based polyester polyol, thereby further improving the color fastness and water washing resistance of the water-based textile coating ink;

[0044] 2. The combination of water-based polyurethane, water-based polyester polyol and water-based aliphatic isocyanate curing agent in a specific ratio is conducive to forming a stable cross-linked structure among the three, so as to consolidate the internal structure of the water-based textile coating ink, thereby improving the stability of the internal structure of the coating ink, and further improving the curing effect of the coating ink, thereby further improving the color fastness of the water-based textile coating ink, and improving the high temperature resistance;

[0045] 3. Under the modification effect of 2,5-disorbitol-bis-4-hydroxybenzoate, the high temperature resistance of the water-based polyester polyol is improved, and the rigid structure of 2,5-disorbitol-bis-4-hydroxybenzoate is beneficial to further consolidate the internal structure of the textile coating ink, so that the water-based textile coating ink can be stably attached to the fabric, thereby achieving further improvement of the water-based textile coating ink's water resistance and high temperature resistance; at the same time, the dispersing effect of 2,5-disorbitol-bis-4-hydroxybenzoate can make the coating ink more evenly dispersed on the fabric to present better dyeing and patterning effects. DETAILED DESCRIPTION

[0046] The present application is further described in detail below in conjunction with embodiments.

[0047] The water-based polyester polyol was purchased from Beijing Baiyuan Chemical Co., Ltd. as polyester polyol BY-3305;

[0048] Aliphatic waterborne polyurethane was purchased from Guangzhou Huigu New Materials Technology Co., Ltd., brand WPU2371A;

[0049] The water-based aliphatic blocked isocyanate curing agent uses the German Covestro water-based aliphatic blocked isocyanate curing agent with a deblocking temperature of 90-150°C;

[0050] The polyether siloxane copolymer uses DOWSIL51 Additive and DOWSIL501W Additive from Dow Chemical of the United States, where the mass ratio of DOWSIL51 Additive to DOWSIL501W Additive is 1:1;

[0051] The water-based resin-free color paste uses organic pigment resin-free color paste from Cabot of the United States;

[0052] Preparation Example

[0053] Preparation Example 1

[0054] Preparation of 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol:

[0055] 1.7 kg of 2,5-sorbitol-bis-4-hydroxybenzoate, 2 kg of waterborne polyester polyol and 6 kg of glycerol were mixed and stirred at 40° C. for 20 min to obtain 2,5-sorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol.

[0056] Preparation Example 2

[0057] Preparation of 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol:

[0058] 2.3 kg of 2,5-disorbitol-bis-4-hydroxybenzoate, 3 kg of waterborne polyester polyol and 6.5 kg of glycerol were mixed and stirred at 50° C. for 30 min to obtain 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol.

[0059] Preparation Example 3

[0060] Preparation of 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol:

[0061] The difference between this preparation example and preparation example 2 is that an equal amount of polycaprolactone diol is used to replace 2,5-disorbitol-bis-4-hydroxybenzoate, that is, 2,5-disorbitol-bis-4-hydroxybenzoate is not added, and 2.3 kg of polycaprolactone diol is added.

[0062] Example

[0063] Example 1

[0064] Preparation of a water-based textile coating ink:

[0065] S1. By a high-speed disperser, 0.8kg of aliphatic waterborne polyurethane, 0.7kg of 2,5-disorbitol-bis-4-hydroxybenzoate-modified waterborne polyester polyol of Preparation Example 1 and 0.2kg of a waterborne aliphatic blocked isocyanate curing agent of Covestro, Germany, with a deblocking temperature of 90° C. were stirred and mixed at a speed of 1800 r / min to obtain a first mixed preform;

[0066] S2. The first mixed preform, 0.02kg polyether siloxane copolymer, 0.01kg isothiazolinone, 0.5kg propylene glycol and 3kg pure water were mixed and stirred at a speed of 500r / min for 20min to obtain a second mixed preform;

[0067] S3. 1kg of water-based resin-free color paste was added to the second mixed preform, and the mixture was stirred at a speed of 500r / min for 20min to obtain a coating ink preform;

[0068] S4. Filtering the paint ink preform with a 1 μm filter membrane, collecting the filtrate, and obtaining an aqueous textile paint ink;

[0069] Among them, the polyether siloxane copolymer is composed of 0.01kg DOWSIL51 Additive and 0.01kg DOWSIL501W Additive; the water-based resin-free color paste uses Carbot400.

[0070] Example 2

[0071] Preparation of a water-based textile coating ink:

[0072] S1. By a high-speed disperser, 2kg of aliphatic waterborne polyurethane, 1.6kg of 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol of Preparation Example 2 and 0.8kg of a waterborne aliphatic blocked isocyanate curing agent of Covestro, Germany, with a deblocking temperature of 150° C. were stirred and mixed at a speed of 2000 r / min to obtain a first mixed preform;

[0073] S2. The first mixed preform, 0.1kg polyether siloxane copolymer, 0.1kg isothiazolinone, 2kg propylene glycol and 6kg pure water were mixed and stirred at a speed of 500r / min for 30min to obtain a second mixed preform;

[0074] S3. 4kg of water-based resin-free color paste was added to the second mixed preform, and the mixture was stirred at a speed of 500r / min for 30min to obtain a coating ink preform;

[0075] S4. Filtering the paint ink preform with a 1 μm filter membrane, collecting the filtrate, and obtaining an aqueous textile paint ink;

[0076] Among them, the polyether siloxane copolymer is composed of 0.05kg DOWSIL51 Additive and 0.05kg DOWSIL501W Additive; the water-based resin-free color paste uses Carbot450C.

[0077] Example 3

[0078] Preparation of a water-based textile coating ink:

[0079] S1. By means of a high-speed disperser, 1 kg of aliphatic waterborne polyurethane, 1 kg of 2,5-disorbitol-bis-4-hydroxybenzoate-modified waterborne polyester polyol of Preparation Example 2 and 0.4 kg of a waterborne aliphatic blocked isocyanate curing agent of Covestro, Germany, having an unblocking temperature of 150 ° C were stirred and mixed at a speed of 2000 r / min to obtain a first mixed preform;

[0080] S2. The first mixed preform, 0.03kg polyether siloxane copolymer, 0.02kg isothiazolinone, 0.95kg propylene glycol and 4kg pure water were mixed and stirred at a speed of 500r / min for 30min to obtain a second mixed preform;

[0081] S3. 2kg of water-based resin-free color paste was added to the second mixed preform, and the mixture was stirred at a speed of 500r / min for 30min to obtain a coating ink preform;

[0082] S4. Filtering the paint ink preform with a 1 μm filter membrane, collecting the filtrate, and obtaining an aqueous textile paint ink;

[0083] Among them, the polyether siloxane copolymer is composed of 0.015kg DOWSIL51 Additive and 0.015kg DOWSIL501W Additive; the water-based resin-free color paste uses Carbot465M.

[0084] Example 4

[0085] Preparation of a water-based textile coating ink:

[0086] S1. By a high-speed disperser, 0.9 kg of aliphatic waterborne polyurethane, 0.9 kg of 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol of Preparation Example 2 and 0.32 kg of a waterborne aliphatic blocked isocyanate curing agent of Covestro, Germany, having an unblocking temperature of 150 ° C were stirred and mixed at a speed of 2000 r / min to obtain a first mixed preform;

[0087] S2. The first mixed preform, 0.06kg polyether siloxane copolymer, 0.04kg isothiazolinone, 1.24kg propylene glycol and 5kg pure water were mixed and stirred at a speed of 500r / min for 30min to obtain a second mixed preform;

[0088] S3. 2.16kg of water-based resin-free color paste was added to the second mixed preform, and the mixture was stirred at a speed of 500r / min for 30min to obtain a coating ink preform;

[0089] S4. Filtering the paint ink preform with a 1 μm filter membrane, collecting the filtrate, and obtaining an aqueous textile paint ink;

[0090] Among them, the polyether siloxane copolymer is composed of 0.03kg DOWSIL51 Additive and 0.03kg DOWSIL501W Additive; the water-based resin-free color paste uses Carbot470Y.

[0091] Example 5

[0092] Preparation of a water-based textile coating ink:

[0093] The difference between this embodiment and embodiment 2 is that the 2,5-sorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol is specifically selected from the 2,5-sorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol prepared in preparation example 3.

[0094] Example 6

[0095] Preparation of a water-based textile coating ink:

[0096] The difference between this embodiment and embodiment 2 is that the deblocking temperature of the water-based aliphatic blocked isocyanate curing agent is 50°C.

[0097] Example 7

[0098] Preparation of a water-based textile coating ink:

[0099] The difference between this embodiment and embodiment 4 is that step S1 is omitted, and the first mixed preform is replaced by 0.9 kg of aliphatic water-based polyurethane, 0.9 kg of 2,5-disorbitol-bis-4-hydroxybenzoate-modified water-based polyester polyol in Preparation Example 2, and 0.32 kg of a water-based aliphatic blocked isocyanate curing agent from Covestro, Germany, with a deblocking temperature of 150°C.

[0100] Comparative Example

[0101] Comparative Example 1

[0102] The difference between this comparative example and Example 2 is that an equal amount of polycaprolactone diol is used to replace the 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol, that is, no 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol is added, and 1.6 kg of polycaprolactone diol is added.

[0103] Comparative Example 2

[0104] The difference between this comparative example and Example 2 is that no water-based aliphatic blocked isocyanate curing agent is added.

[0105] Performance test data

[0106] The water-based textile coating inks prepared in Examples 1-7 and Comparative Examples 1-2 of the present application were spray-printed on pure cotton fabrics, respectively, and then baked at 150° C. for 120 seconds to prepare pure cotton printed fabrics.

[0107] Test 1: With reference to GB / T 3920-1997 "Textiles - Tests for Color Fastness - Color Fastness to Rubbing", the pure cotton printed fabrics of Examples 1-7 and Comparative Examples 1-2 of the present application were made into samples, and the samples were tested for color fastness to rubbing according to the standard. The test results are shown in Table 1. The color fastness to rubbing grades are divided into 5 grades, namely 1, 2, 3, 4, and 5. The higher the grade, the better the color fastness to rubbing of the water-based textile coating ink.

[0108] Test 2: With reference to GB / T 3921.1-1997 "Textiles - Tests for Color Fastness - Color Fastness to Washing: Test 1", the pure cotton printed fabrics of Examples 1-7 and Comparative Examples 1-2 of the present application were made into samples, and the samples were tested for color fastness to washing according to the standard. The test results are shown in Table 1. The color fastness to washing is represented by the color change level of the sample and the color change level of the lining fabric. The color change level is divided into 5 levels of 1, 2, 3, 4, and 5. The higher the level, the better the washing resistance of the water-based textile coating ink.

[0109] Test 3: With reference to GB / T 5718-1997 "Textiles - Tests for colour fastness - Colour fastness to dry heat (excluding hot pressing)", the pure cotton printed fabrics of Examples 1-7 and Comparative Examples 1-2 of the present application were made into samples, and the samples were tested for colour fastness to high temperature according to the standard, and the test temperature was 180°C. The test results are shown in Table 1. The colour fastness to high temperature is represented by the colour change degree of the sample and the colour change degree of the lining fabric. The colour change degree is divided into 5 levels of 1, 2, 3, 4 and 5. The higher the degree, the better the high temperature resistance of the water-based textile coating ink.

[0110] Table 1 Summary of performance test results

[0111]

[0112]

[0113] Combining Example 2 with Comparative Examples 1-2 and the data in Table 1, it can be seen that when the present application simultaneously adds 2,5-disorbitol-bis-4-hydroxybenzoate modified water-based polyester polyol and water-based aliphatic blocked isocyanate curing agent, it is beneficial to significantly improve the color fastness, water washing resistance and high temperature resistance of water-based textile coating ink.

[0114] Combining Example 2 with Example 3-4 and the data in Table 1, it can be seen that when the aliphatic waterborne polyurethane, 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol and the waterborne aliphatic blocked isocyanate curing agent are combined in a weight ratio of (40-45): (40-45): 16, it is beneficial to further improve the color fastness and high temperature resistance of the waterborne textile coating ink; and in combination with the comparison of Example 4 and Example 7, it can be seen that Example 7 does not first combine the aliphatic waterborne polyurethane, 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol and the waterborne aliphatic blocked isocyanate curing agent. The three agents are stirred and mixed to obtain a first mixed preform, which has little promoting effect on improving the color fastness, water washing resistance and high temperature resistance of water-based textile coating ink; it can be seen that it is necessary to first stir and mix the 2,5-dicelydigol-bis-4-hydroxybenzoate modified water-based polyester polyol, the water-based aliphatic blocked isocyanate curing agent and the aliphatic water-based polyurethane in a specific ratio, so that the three are fully integrated to form a stable cross-linked structure, to obtain a first mixed preform with a stable structure, and then use the first mixed preform to participate in the subsequent preparation steps, so as to achieve the effective improvement of the color fastness, water washing resistance and high temperature resistance of the water-based textile coating ink.

[0115] Combining Example 2 with Examples 5-6 and the data in Table 1, it can be seen that the color fastness to rubbing, the color fastness to washing and the color fastness to high temperature of Example 5 are lower than those of Example 2, indicating that 2,5-disorbitol-bis-4-hydroxybenzoate is required to mix and modify the aqueous polyester polyol in order to better promote the improvement of the color fastness, washing resistance and high temperature resistance of the aqueous textile coating ink; at the same time, according to Example 6, when an aqueous aliphatic blocked isocyanate curing agent with an unblocking temperature of 50°C is used to prepare an aqueous textile coating ink, the color fastness, washing resistance and high temperature resistance of the aqueous textile coating ink are reduced, indicating that the use of an aqueous aliphatic blocked isocyanate curing agent with an unblocking temperature of 90-150°C is beneficial to stabilizing and regulating the reactivity of the isocyanate curing agent, so as to achieve the purpose of improving the curing effect and adhesion of the aqueous textile coating ink, thereby further improving the color fastness, washing resistance and high temperature resistance of the aqueous textile coating ink.

[0116] The above are all preferred embodiments of the present application. The embodiments are only explanations of the present application and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water-based textile coating ink, characterized in that: Contains the following raw materials in parts by weight: 8-20 parts of waterborne polyurethane; 7-16 parts of water-based polyester polyol; 2-8 parts of water-based aliphatic isocyanate curing agent; Polyether siloxane copolymer 0.2-1 part; 0.1-1 part of fungicide; 10-40 parts of water-based resin-free color paste; 5-20 parts of the first solvent; 30-60 parts of pure water; The waterborne polyester polyol is a 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol, the raw materials for preparing the 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol include 2,5-disorbitol-bis-4-hydroxybenzoate, waterborne polyester polyol and a second solvent, and the weight ratio of the 2,5-disorbitol-bis-4-hydroxybenzoate, waterborne polyester polyol and the second solvent is (17-23): (20-30): (60-65); The preparation method of the 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol is as follows: 2,5-disorbitol-bis-4-hydroxybenzoate, waterborne polyester polyol and a second solvent are mixed, heated to 40-50° C., and stirred for 20-30 minutes to obtain the 2,5-disorbitol-bis-4-hydroxybenzoate modified waterborne polyester polyol.

2. A water-based textile coating ink according to claim 1, characterized in that: The weight ratio of the waterborne polyurethane, waterborne polyester polyol and waterborne aliphatic isocyanate curing agent is (40-45): (40-45):

16.

3. The aqueous textile coating ink according to claim 1, characterized in that: The water-based aliphatic isocyanate curing agent is a water-based aliphatic blocked isocyanate curing agent.

4. A water-based textile coating ink according to claim 3, characterized in that: The deblocking temperature of the water-based aliphatic blocked isocyanate curing agent is 90-150°C.

5. The water-based textile coating ink according to claim 1, characterized in that: The waterborne polyurethane is selected from aliphatic waterborne polyurethane.

6. The water-based textile coating ink according to claim 1, characterized in that: The first solvent is selected from one or more of ethylene glycol, glycerol, isopropanol, diethylene glycol, PEG400, PEG600, PEG1000, propylene glycol, 1,5-pentanediol, ethylene glycol butyl ether and diethylene glycol butyl ether.

7. A method for preparing the water-based textile coating ink according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The aqueous polyurethane, aqueous polyester polyol and aqueous aliphatic isocyanate curing agent are stirred and mixed to obtain a first mixed preform; S2. The first mixed preform, the polyether siloxane copolymer, the bactericide, the first solvent and pure water are mixed and stirred for 20-30 min to obtain a second mixed preform; S3. Adding water-based resin-free color paste to the second mixed preform, stirring and mixing for 20-30min to obtain a coating ink preform; S4. Filter the paint ink preform with a filter membrane, collect the filtrate, and obtain a water-based textile paint ink.

8. The method for preparing a water-based textile coating ink according to claim 7, characterized in that: The stirring speed in step S1 is 1800-2000 r / min.

Images