Auxiliary printing paint and preparation method thereof

Abstract

The invention relates to the field of coatings for cloth, in particular to an auxiliary printing coating and a preparation method thereof. The auxiliary printing paint is prepared from the following raw materials in percentage by mass: 20 to 25 percent of TPU elastomer, 20 to 25 percent of pigment paste, 0.1 to 1 percent of auxiliary agent, 15 to 20 percent of solvent A and gas propellant, the pigment paste is prepared from the following raw materials in percentage by mass: 45 to 55 percent of alcohol-soluble acrylic acid, 20 to 30 percent of pigment, a solvent B and 0.1 to 2 percent of a dispersing agent. The method has the advantages that the influence of alcohol-soluble acrylic acid on fabric hardening is relieved, and the fabric is soft and more breathable.

Description

Technical Field

[0001] The present application relates to the field of coatings for cloth, and more specifically, to an auxiliary printing coating and a preparation method thereof. Background Art

[0002] In the current field of textile and garment processing, spray painting technology, especially automatic spray painting technology, is widely favored by foreign users due to its high efficiency and convenience. This technology is widely used in personalized processing such as color change, pattern drawing and marking of fabrics or ready-made clothes. The core component of the paint used for automatic spray painting is usually alcohol-soluble acrylic film-forming substance. Due to its unique chemical properties, alcohol-soluble acrylic acid gives the paint the advantages of fast drying speed, strong durability and good adhesion to fabrics. These characteristics make alcohol-soluble acrylic film-forming substances an ideal choice for making spray paints, and also meet the high requirements of users for color vividness and color durability.

[0003] However, despite the excellent performance of alcohol-soluble acrylic film-forming substances in spray paint, they also have a significant drawback. When the paint is completely dry, the fabric tends to become stiff. This phenomenon is particularly obvious in the case of thick coating, which not only affects the softness and comfort of the fabric, but also seriously reduces its breathability. For clothing that needs to maintain good breathability, such as sportswear, underwear, etc., this defect undoubtedly limits the application of alcohol-soluble acrylic film-forming substances in these fields. Summary of the invention

[0004] In order to alleviate the effect of alcohol-soluble acrylic acid on the hardening of fabric and make the fabric soft, the present application provides an auxiliary printing coating and a preparation method thereof.

[0005] In the first aspect, the present application provides an auxiliary printing coating, which adopts the following technical solution: An auxiliary printing coating comprises the following raw materials in terms of mass percentage: 20-25% TPU elastomer, 20-25% pigment slurry, 0.1-1% auxiliary agent, 15-20% solvent A, and gas propellant; The pigment paste comprises the following raw materials according to mass percentage: 45-55% alcohol-soluble acrylic acid, 20-30% pigment, solvent B, and 0.1-2% dispersant.

[0006] By adopting the above technical solution, using thermoplastic polyurethane elastomer rubber (TPU) in combination with alcohol-soluble acrylic resin, the problem of fabric hardening can be alleviated through the characteristics of TPU molecular structure. TPU has excellent flexibility due to its unique molecular linear structure and low glass transition temperature. When TPU is mixed with alcohol-soluble acrylic acid, the flexibility of TPU can effectively compensate for the hardening and brittleness caused by the drying of alcohol-soluble acrylic acid, thereby significantly improving the comfort and wear resistance of the final product. Therefore, by using TPU in combination with alcohol-soluble acrylic acid, the prepared coating can effectively reduce the hardening of the fabric while maintaining excellent adhesion and color. In addition, TPU and alcohol-soluble acrylic resin can complement each other and jointly improve the breathability of the fabric.

[0007] Preferably, in terms of mass percentage, the auxiliary printing paint further comprises 1-3% of modified fiber, and the raw materials for preparing the modified fiber include abaca fiber, sodium alginate and diatomaceous earth.

[0008] Preferably, the mass ratio of the abaca fiber, sodium alginate and diatomaceous earth is 1:(0.05-0.1):(0.2-0.5), based on the mass of the abaca fiber.

[0009] By adopting the above technical solution, abaca fiber, sodium alginate and diatomaceous earth cooperate with each other, the diatomaceous earth adheres to the surface of abaca fiber, and the sodium alginate forms a porous protective film to make the diatomaceous earth firmly and stably attached to the abaca fiber, forming a special fiber structure.

[0010] The modified fiber with special structure has diatomaceous earth with rich holes on the surface, so it does not affect the passage of gas. Also due to the special fiber structure, the toughness of abaca fiber is greatly improved. It is not easy to break when subjected to external force, and its performance is long-lasting and stable.

[0011] After the auxiliary printing coating containing modified fibers is sprayed onto the surface of the fabric to form a film, the modified fibers give full play to their breathable and high toughness effects, giving the coating the characteristics of breathable, soft and durable.

[0012] Preferably, the solvent A and the solvent B are anhydrous ethanol.

[0013] In a second aspect, the present application provides a method for preparing an auxiliary printing coating, using the following technical solution: A method for preparing an auxiliary printing coating comprises the following steps: Step 1: Heat the TPU elastomer at 35-40°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use; Step 2: Evenly mix the alcohol-soluble acrylic acid, the pigment, the solvent B, and the dispersant to obtain a pigment slurry; Step 3: Mix the TPU elastomer, pigment slurry, additive, solvent A and gas propellant until uniform to obtain auxiliary printing coating.

[0014] By adopting the above technical solution, the auxiliary printing coating can be prepared by a simple and quick preparation method with low cost.

[0015] In a third aspect, the present application provides a method for preparing an auxiliary printing coating, using the following technical solution: A method for preparing an auxiliary printing coating comprises the following steps: Step 1: Heat the TPU elastomer at 35-40°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use; Step 2: Evenly mix the alcohol-soluble acrylic acid, the pigment, the solvent B, and the dispersant to obtain a pigment slurry; Step 3: Preparation of modified fiber: Step 3a: Wash and cut abaca leaves; Step 3b: Soak abaca leaves in acid solution; Step 3c: beating the soaked abaca leaves; Step 3d: cleaning the material after the fiber beating treatment in step 3c; Step 3e: soaking the material cleaned in step 3d in an alkaline solution; Step 3f: washing the material after the alkali soaking treatment in step 3e, drying, and obtaining abaca fiber; Step 3g: soaking the abaca fiber in a 0.01-0.05% potassium permanganate aqueous solution, taking it out and drying it; Step 3h: Mix the dried material in step 3g with sodium alginate, diatomaceous earth and water, mix at 1500-2000 r / min for 10-20 min, take out and dry to obtain modified fiber; Step 4: Mix the TPU elastomer, pigment slurry, additive, solvent A, gas propellant, and modified fiber until uniform to obtain auxiliary printing coating. By adopting the above technical solution, potassium permanganate is used to treat abaca fiber, which effectively etches the fiber surface, so that more grooves appear on the abaca fiber surface. The appearance of these grooves makes the fiber surface rougher, providing more sites for subsequent diatomaceous earth attachment, and diatomaceous earth is easier to firmly attach. In this process, sodium alginate dissolved in water will also cover the diatomaceous earth and the surface of abaca fiber, which is equivalent to a porous net that further stabilizes the diatomaceous earth on the abaca fiber, making the performance of the modified fiber more stable and effectively enhanced, and effectively improving the air permeability and softness of the formed coating.

[0016] Preferably, in step 3g, the mass ratio of the material dried in step 3f to the potassium permanganate aqueous solution is 1:(2-5).

[0017] Preferably, in step 3g, when the material dried in step 3f is immersed in the potassium permanganate aqueous solution, the temperature is maintained at 40-50° C. and the immersion time is 2-4 hours.

[0018] By adopting the above technical solution, the treatment conditions of potassium permanganate on abaca fiber are further limited, and over-etching and under-etching will not occur, which is more conducive to the subsequent combination with diatomaceous earth and sodium alginate.

[0019] In summary, this application has the following beneficial effects: 1. The use of thermoplastic polyurethane elastomer rubber (TPU) combined with alcohol-soluble acrylic resin can effectively solve the problem of fabric hardening. TPU exhibits excellent flexibility due to its linear molecular structure and low glass transition temperature. When mixed with alcohol-soluble acrylic, TPU can offset the hardening and brittle effects caused by the drying of the latter, enhancing the comfort and wear resistance of the product. This combination not only ensures the excellent adhesion and color performance of the coating, but also significantly reduces the hardening of the fabric. At the same time, TPU and alcohol-soluble acrylic resin complement each other and jointly improve the breathability of the fabric.

[0020] 2. Combine abaca fiber, sodium alginate and diatomaceous earth to form a special fiber structure. Diatomaceous earth is tightly attached to the surface of abaca fiber, while sodium alginate forms a porous membrane to stabilize the position of diatomaceous earth. This special fiber structure not only keeps the gas permeable and unobstructed, but also greatly enhances the toughness of abaca fiber, making it difficult to break under external force and having long-lasting and stable performance. This modified fiber is used in auxiliary printing coatings. After spraying on the surface of the fabric to form a coating, its excellent air permeability and high toughness are fully demonstrated, giving the fabric breathable, soft and durable characteristics.

[0021] 3. Treating abaca fiber with potassium permanganate forms many grooves on its surface, increasing the roughness of the fiber surface and providing more attachment points for diatomaceous earth, thereby enhancing the firmness of diatomaceous earth. Sodium alginate further stabilizes the position of diatomaceous earth. This not only improves the stability of the modified fiber, but also significantly enhances its performance, making the final coating perform well in terms of air permeability and softness. DETAILED DESCRIPTION

[0022] The present application is further described in detail below with reference to the embodiments.

[0023] The raw materials used in the following examples and comparative examples are all commercially available products. Example

[0024] Example 1 An auxiliary printing coating comprises the following raw materials: TPU elastomer, pigment slurry, auxiliary agent, solvent A and gas propellant.

[0025] The specific amount of each raw material is shown in Table 1.

[0026] The TPU elastomer is Covestro (Bayer) 2195 from Germany.

[0027] The additive is BYK-333.

[0028] Solvent A is anhydrous ethanol.

[0029] The propellant gas is dimethyl ether.

[0030] The pigment paste includes the following raw materials: alcohol-soluble acrylic acid, pigment, solvent B, and dispersant.

[0031] The alcohol-soluble acrylic acid is MR1715A produced by Guangdong Keding Functional Materials Co., Ltd.

[0032] The pigment is commercially available pigment red.

[0033] Solvent B is anhydrous ethanol.

[0034] The dispersant is BYK-163.

[0035] The specific amount of each raw material in the pigment slurry is shown in Table 2.

[0036] The present application also provides a method for preparing an auxiliary printing coating, comprising the following steps: Step 1: Heat the TPU elastomer at 38°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0037] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0038] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1200 r / min), and grind them to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0039] Step 3: Mix the TPU elastomer, pigment slurry, additive, solvent A and gas propellant until uniform to obtain auxiliary printing coating.

[0040] Example 2 An auxiliary printing coating, which is different from Example 1 in that: The specific amount of each raw material is different, see Table 1 for details.

[0041] The specific amount of each raw material in the pigment slurry is different, see Table 2 for details.

[0042] A method for preparing an auxiliary printing coating, which is different from Example 1 in that it comprises the following steps: Step 1: Heat the TPU elastomer at 35°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0043] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0044] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1000 r / min), and grind to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0045] Step 3: Mix the TPU elastomer, pigment slurry, additive, solvent A and gas propellant until uniform to obtain auxiliary printing coating.

[0046] Example 3 An auxiliary printing coating, which is different from Example 1 in that: The specific amount of each raw material is different, see Table 1 for details.

[0047] The specific amount of each raw material in the pigment slurry is different, see Table 2 for details.

[0048] A method for preparing an auxiliary printing coating, which is different from Example 1 in that it comprises the following steps: Step 1: Heat the TPU elastomer at 40°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0049] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0050] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1500 r / min), and grind them to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0051] Step 3: Mix the TPU elastomer, pigment slurry, additive, solvent A and gas propellant until uniform to obtain auxiliary printing coating.

[0052] Table 1 Category Example 1 Example 2 Example 3 TPU elastomer(kg) 23 20 25 Pigment slurry (kg) 22 20 25 Additives(kg) 0.6 0.1 1 Solvent A (kg) 18 15 20 Gas propellant (kg) 36.4 44.9 29 Table 2 Category Example 1 Example 2 Example 3 Alcohol soluble acrylic acid (kg) 50 45 55 Pigment(kg) 25 20 30 Solvent B (kg) 24 34.9 13 Dispersant(kg) 1 0.1 2 Example 4 An auxiliary printing coating, which is different from Example 1 in that it also includes 2 kg of modified fiber and 34.4 kg of gas propellant.

[0053] The raw materials for preparing the modified fiber include abaca fiber, sodium alginate and diatomaceous earth, and the mass ratio of the abaca fiber, sodium alginate and diatomaceous earth is 1:0.08:0.3.

[0054] A method for preparing an auxiliary printing coating comprises the following steps: Step 1: Heat the TPU elastomer at 38°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0055] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0056] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1200 r / min), and grind them to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0057] Step 3: Preparation of modified fiber: Step 3a: Wash the abaca leaves with clean water, cut and crush the abaca leaves into 1-2mm pieces.

[0058] Step 3b: Soaking abaca leaves in an acid solution (3 g / L sulfuric acid solution) for 1 hour, with the mass ratio of the acid solution to the abaca leaves being 2:1.

[0059] Step 3c: The soaked abaca leaves are beaten to remove the gum.

[0060] Step 3d: Wash the material after the fiber beating treatment in step 3c with clean water to remove the acid solution.

[0061] Step 3e: Soak the material cleaned in step 3d in an alkaline solution (15 g / L sodium hydroxide solution) for 4 hours.

[0062] The mass ratio of the material after cleaning in step 3d to the alkaline solution is 1:10.

[0063] Step 3f: Wash the material treated with alkali in step 3e with clean water, and dry it with hot air to a constant weight to obtain abaca fiber.

[0064] Step 3g: Soak the abaca fiber in a 0.03% potassium permanganate aqueous solution at 45° C. for 3 hours.

[0065] The mass ratio of abaca fiber to potassium permanganate aqueous solution is 1:3.

[0066] After taking it out, dry it with hot air until constant weight.

[0067] Step 3h: prepare materials according to abaca fiber, sodium alginate and diatomaceous earth in a mass ratio of 1:0.08:0.3.

[0068] The dried material in step 3g was mixed with sodium alginate, diatomaceous earth and water, and mixed at 1800 r / min for 15 min. After being taken out, it was dried with hot air to constant weight to obtain modified fiber.

[0069] The mass ratio of the total mass of the dried material, sodium alginate and diatomaceous earth to water in step 3g is 1:3.

[0070] Step 4: Mix the TPU elastomer, pigment slurry, additive, solvent A, gas propellant and modified fiber until uniform to obtain auxiliary printing coating.

[0071] Example 5 An auxiliary printing coating, which is different from Example 2 in that it also includes 1 kg of modified fiber and 43.9 kg of gas propellant.

[0072] The raw materials for preparing the modified fiber include abaca fiber, sodium alginate and diatomaceous earth, and the mass ratio of the abaca fiber, sodium alginate and diatomaceous earth is 1:0.05:0.2.

[0073] A method for preparing an auxiliary printing coating comprises the following steps: Step 1: Heat the TPU elastomer at 35°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0074] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0075] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1000 r / min), and grind to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0076] Step 3: Preparation of modified fiber: Step 3a: Wash the abaca leaves with clean water, cut and crush the abaca leaves into 1-2mm pieces.

[0077] Step 3b: Soaking abaca leaves in an acid solution (3 g / L sulfuric acid solution) for 1 hour, with the mass ratio of the acid solution to the abaca leaves being 2:1.

[0078] Step 3c: The soaked abaca leaves are beaten to remove the gum.

[0079] Step 3d: Wash the material after the fiber beating treatment in step 3c with clean water to remove the acid solution.

[0080] Step 3e: Soak the material cleaned in step 3d in an alkaline solution (15 g / L sodium hydroxide solution) for 4 hours.

[0081] The mass ratio of the material after cleaning in step 3d to the alkaline solution is 1:10.

[0082] Step 3f: Wash the material treated with alkali in step 3e with clean water, and dry it with hot air to a constant weight to obtain abaca fiber.

[0083] Step 3g: Soak the abaca fiber in a 0.01% potassium permanganate aqueous solution at 40° C. for 4 hours.

[0084] The mass ratio of abaca fiber to potassium permanganate aqueous solution is 1:2.

[0085] After taking it out, dry it with hot air until constant weight.

[0086] Step 3h: prepare materials according to abaca fiber, sodium alginate and diatomaceous earth in a mass ratio of 1:0.05:0.2.

[0087] The dried material in step 3g was mixed with sodium alginate, diatomaceous earth and water, and mixed at 1500 r / min for 20 min. After being taken out, it was dried with hot air to constant weight to obtain modified fiber.

[0088] The mass ratio of the total mass of the dried material, sodium alginate and diatomaceous earth to water in step 3g is 1:3.

[0089] Step 4: Mix the TPU elastomer, pigment slurry, additive, solvent A, gas propellant and modified fiber until uniform to obtain auxiliary printing coating.

[0090] Example 6 An auxiliary printing coating, which is different from Example 3 in that it also includes 3kg of modified fibers and 26kg of gas propellant.

[0091] The raw materials for preparing the modified fiber include abaca fiber, sodium alginate and diatomaceous earth, and the mass ratio of the abaca fiber, sodium alginate and diatomaceous earth is 1:0.1:0.5.

[0092] A method for preparing an auxiliary printing coating comprises the following steps: Step 1: Heat the TPU elastomer at 40°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0093] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0094] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1500 r / min), and grind them to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0095] Step 3: Preparation of modified fiber: Step 3a: Wash the abaca leaves with clean water, cut and crush the abaca leaves into 1-2mm pieces.

[0096] Step 3b: Soaking abaca leaves in an acid solution (3 g / L sulfuric acid solution) for 1 hour, with the mass ratio of the acid solution to the abaca leaves being 2:1.

[0097] Step 3c: The soaked abaca leaves are beaten to remove the gum.

[0098] Step 3d: Wash the material after the fiber beating treatment in step 3c with clean water to remove the acid solution.

[0099] Step 3e: Soak the material cleaned in step 3d in an alkaline solution (15 g / L sodium hydroxide solution) for 4 hours.

[0100] The mass ratio of the material after cleaning in step 3d to the alkaline solution is 1:10.

[0101] Step 3f: Wash the material treated with alkali in step 3e with clean water, and dry it with hot air to a constant weight to obtain abaca fiber.

[0102] Step 3g: Soak the abaca fiber in a 0.05% potassium permanganate aqueous solution at 50° C. for 2 hours.

[0103] The mass ratio of abaca fiber to potassium permanganate aqueous solution is 1:5.

[0104] After taking it out, dry it with hot air until constant weight.

[0105] Step 3h: prepare materials according to abaca fiber, sodium alginate and diatomaceous earth in a mass ratio of 1:0.05:0.2.

[0106] The dried material in step 3g was mixed with sodium alginate, diatomaceous earth and water, and mixed at 2000 r / min for 10 min. After being taken out, it was dried with hot air to constant weight to obtain modified fiber.

[0107] The mass ratio of the total mass of the dried material, sodium alginate and diatomaceous earth to water in step 3g is 1:3.

[0108] Step 4: Mix the TPU elastomer, pigment slurry, additive, solvent A, gas propellant and modified fiber until uniform to obtain auxiliary printing coating.

[0109] Comparative Example Comparative Example 1 An auxiliary printing coating, which is different from Example 1 in that the TPU elastomer is replaced by solvent A.

[0110] Comparative Example 2 An auxiliary printing coating, which is different from Example 4 in that the TPU elastomer is replaced by solvent A.

[0111] Comparative Example 3 An auxiliary printing coating, which is different from Example 4 in that sodium alginate is replaced by chitosan.

[0112] Comparative Example 4 An auxiliary printing coating, which is different from Example 4 in that diatomaceous earth is replaced by zeolite.

[0113] Comparative Example 5 An auxiliary printing paint, which is different from Example 4 in that abaca fiber is replaced by jute fiber.

[0114] A method for preparing an auxiliary printing coating, which is different from Example 4 in that it comprises the following steps: Step 1: Heat the TPU elastomer at 38°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use.

[0115] The dissolved TPU elastomer is transparent and is allowed to stand at room temperature for 2 hours.

[0116] Step 2: Use a disperser to stir and mix the alcohol-soluble acrylic acid, pigment, solvent B, and dispersant evenly (1200 r / min), and grind them to a fineness of 15 μm with a closed sand mill to obtain a pigment slurry.

[0117] Step 3: Preparation of modified fiber: Step 3a: soak commercially available jute fiber in a 0.03% potassium permanganate aqueous solution at 45° C. for 3 hours.

[0118] The mass ratio of commercially available jute fiber to potassium permanganate aqueous solution is 1:3.

[0119] After taking it out, dry it with hot air until constant weight.

[0120] Step 3b: prepare materials according to the mass ratio of commercially available jute fiber, sodium alginate and diatomaceous earth of 1:0.08:0.3.

[0121] The material dried in step 3a was mixed with sodium alginate, diatomaceous earth and water, mixed at 1800 r / min for 15 min, taken out and dried with hot air to constant weight to obtain modified fiber.

[0122] The mass ratio of the total mass of the dried material, sodium alginate and diatomaceous earth to water in step 3a is 1:3.

[0123] Step 4: Mix the TPU elastomer, pigment slurry, additive, solvent A, gas propellant and modified fiber until uniform to obtain auxiliary printing coating.

[0124] Comparative Example 6 An auxiliary printing coating, which is different from Example 4 in that the raw materials for preparing the modified fiber include abaca fiber, sodium alginate, and diatomaceous earth, and the mass ratio of the abaca fiber, sodium alginate, and diatomaceous earth is 1:0.3:0.08.

[0125] Comparative Example 7 A method for preparing an auxiliary printing coating, which is different from Example 4 in that: In step 3h, the dried material in step 3g is mixed with sodium alginate, diatomaceous earth and water at 180 r / min.

[0126] Performance testing The auxiliary printing paints of Examples 1-6 and Comparative Examples 1-7 are loaded into a spraying robot, and the spraying robot is made to spray the auxiliary printing paints toward the surface of the cloth to form a coating. After the coating is completely dry, a test cloth sample is obtained.

[0127] 1. Softness: Test the fabric samples according to GB / T 18318.1-2009 “Determination of flexural properties of textiles Part 1: Inclined plane method” and record the flexural stiffness in Table 3.

[0128] 2. Air permeability: Test the fabric samples with reference to GB / T5453-1997 “Determination of air permeability of textile fabrics” and record the air permeability in Table 3.

[0129] Table 3 Comparative Example 1 is based on Examples 1-3, but the TPU elastomer is omitted. The auxiliary printing coating prepared is sprayed on the surface of the fabric. In the softness and air permeability tests, it is obviously not as soft and air permeable as Examples 1-3. This shows that the combination of thermoplastic polyurethane elastomer rubber (TPU) and alcohol-soluble acrylic resin can alleviate the hardening problem of the coating on the fabric to a certain extent, and simultaneously improve the air permeability of the fabric.

[0130] On the other hand, based on Examples 1 to 3, special modified fibers are further added in Examples 4 to 6. According to the test data in Table 3, the performance of the tested fabric samples in Examples 4 to 6 in terms of air permeability and softness is further optimized and improved.

[0131] Comparative Examples 3-5 are based on Example 4, destroying the special combination of abaca fiber, sodium alginate and diatomaceous earth; Comparative Example 6 is based on Example 4, destroying the special ratio of the three; Comparative Example 7 is based on Example 4, destroying the special preparation steps of the three. According to the test data in Table 3, the above-mentioned different degrees of destruction all make the test cloth samples show obvious performance degradation in the test of air permeability and softness. It shows that the technical solution of making special modified fiber from abaca fiber, sodium alginate and diatomaceous earth is a whole and cannot be separated at will, otherwise it cannot effectively improve the coating effect and have a good effect on the cloth.

[0132] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. An auxiliary printing coating, It is characterized in that In terms of mass percentage, it includes the following raw materials: 20-25% TPU elastomer, 20-25% pigment slurry, 0.1-1% additive, 15-20% solvent A, gas propellant; The pigment paste includes the following raw materials according to mass percentage: 45-55% alcohol-soluble acrylic acid, 20-30% pigment, solvent B, and 0.1-2% dispersant.

2. The auxiliary printing coating according to claim 1, Features: According to the mass percentage, the auxiliary printing paint also includes 1-3% modified fiber, and the raw materials for preparing the modified fiber include abaca fiber, sodium alginate and diatomaceous earth.

3. The auxiliary printing coating according to claim 2, Features: The mass ratio of the abaca fiber, sodium alginate and diatomaceous earth is 1:(0.05-0.1):(0.2-0.5), with the mass of the abaca fiber as the basis.

4. The auxiliary printing paint according to any one of claims 1 to 3, Features: The solvent A and the solvent B are anhydrous ethanol.

5. A method for preparing the auxiliary printing coating according to claim 1 or 4, It is characterized in that The following steps are involved: Step 1: Heat the TPU elastomer at 35-40°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use; Step 2: Evenly mix the alcohol-soluble acrylic acid, the pigment, the solvent B, and the dispersant to obtain a pigment slurry; Step 3: Mix the TPU elastomer, pigment slurry, additive, solvent A and gas propellant until uniform to obtain auxiliary printing coating.

6. A method for preparing the auxiliary printing coating according to any one of claims 2 to 3, It is characterized in that The following steps are involved: Step 1: Heat the TPU elastomer at 35-40°C to dissolve it, and keep it warm for 1 hour to obtain the dissolved TPU elastomer for standby use; Step 2: Evenly mix the alcohol-soluble acrylic acid, the pigment, the solvent B, and the dispersant to obtain a pigment slurry; Step 3: Preparation of modified fiber: Step 3a: Wash and cut abaca leaves; Step 3b: Soak abaca leaves in acid solution; Step 3c: beating the soaked abaca leaves; Step 3d: cleaning the material after the fiber beating treatment in step 3c; Step 3e: soaking the material cleaned in step 3d in an alkaline solution; Step 3f: washing the material after the alkali soaking treatment in step 3e, drying, and obtaining abaca fiber; Step 3g: soaking the abaca fiber in a 0.01-0.05% potassium permanganate aqueous solution, taking it out and drying it; Step 3h: Mix the dried material in step 3g with sodium alginate, diatomaceous earth and water, mix at 1500-2000 r / min for 10-20 min, take out and dry to obtain modified fiber; Step 4: Mix the TPU elastomer, pigment slurry, additive, solvent A, gas propellant and modified fiber until uniform to obtain auxiliary printing coating.

7. The method for preparing the auxiliary printing coating according to claim 6, Features: In the step 3g, the mass ratio of the material dried in step 3f to the potassium permanganate aqueous solution is 1:(2-5).

8. The method for preparing the auxiliary printing coating according to claim 6, Features: In the step 3g, when the material dried in the step 3f is immersed in the potassium permanganate aqueous solution, the temperature is maintained at 40-50° C. and the immersion time is 2-4 hours.

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