Efficient double-sided printing and dyeing process for enhancing printing water repellency of polyester fabric

Abstract

The invention relates to the technical field of double-sided printing and dyeing, in particular to a polyester fabric efficient double-sided printing and dyeing process for strengthening printing water repellency, which comprises the following steps: S1, surface modification treatment; s2, preparing front printing dye liquor; s3, preparing reverse printing dye liquor; s4, double-sided printing and dyeing; the surface of the polyester fabric is divided into the printing area and the blank area, and the thermal insulation material covers the blank area during primary microwave heating, so that the loss of heat from the blank area can be effectively reduced, more energy is absorbed by the printing area, and the primary heating efficiency is improved; the printing area is covered for secondary microwave heating, heat loss can be further reduced, meanwhile, waste heat of primary microwave heating is utilized, extra energy consumption is reduced, and therefore the overall heating efficiency is improved, more accurate temperature control is achieved, and the overall temperature distribution uniformity of the surface of the polyester fabric is improved.

Description

Technical Field

[0001] The invention relates to the technical field of double-sided printing and dyeing, and in particular to a high-efficiency double-sided printing and dyeing process for polyester fabrics with enhanced printed water repellency. Background Art

[0002] Double-sided printing and dyeing is a special textile dyeing technology that allows dyeing on both sides of the fabric, thus solving the problem of insufficient coloring on the reverse side of the fabric in traditional single-sided digital printing. This technology can improve the printing quality and help improve the overall aesthetics and market competitiveness of the product.

[0003] Printed fabrics often require a water-repellent treatment to enhance their practicality and durability. Water-repellent treatments can help fabrics resist water penetration and stay dry, which is especially important for outdoor clothing and rain gear. Treatment methods include treating the fabric with a water-repellent or fluorine-free water-repellent to achieve the fabric's water-repellent properties. In some cases, the front of the fabric may be printed and the back is treated with a water-repellent treatment, so that when the fabric comes into contact with water, the printed area absorbs water to show a unique pattern, while the water-repellent area remains dry.

[0004] If the water repellent is unevenly distributed during the printing process, the water repellency of the finished product may vary between different areas, thereby affecting the overall water repellency of the fabric. Usually, the water repellency of textiles treated with water repellent may gradually decrease after multiple washings. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a high-efficiency double-sided printing and dyeing process for polyester fabrics with enhanced printed water repellency.

[0006] A high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency comprises the following steps:

[0007] S1. Surface modification:

[0008] The front and back sides of the polyester fabric are subjected to surface modification treatment respectively;

[0009] S2, preparing front printing dye solution:

[0010] By weight, 15 to 20 parts of active yellow K-6G dye, 4 to 6 parts of anhydrous ethanol, and 15 to 20 parts of deionized water are stirred and mixed to obtain a mixed solution A, and then 0.5 to 0.7 parts of sodium polystyrene sulfonate, 1 to 3 parts of paraffin wax, and 1 to 2 parts of hexamethylol melamine are added to the mixed solution A and stirred and mixed to obtain a front printing dye solution;

[0011] S3, preparing reverse printing dye solution:

[0012] By weight, 10 to 20 parts of active turquoise K-GL dye, 3 to 5 parts of anhydrous ethanol, and 12 to 16 parts of deionized water are stirred and mixed uniformly to obtain a mixed solution B, and then 0.4 to 0.5 parts of polyvinyl pyrrolidone, 1 to 3 parts of thiophenol, and 1 to 2 parts of nano silicon dioxide are added to the mixed solution B and stirred and mixed uniformly to obtain a reverse printing dye solution;

[0013] S4, double-sided printing and dyeing:

[0014] S4-1, using a digital printing machine to spray the front printing dye prepared in step S2 on the front side of the polyester fabric, and the back printing dye prepared in step S3 on the back side of the polyester fabric, with the spraying amount of 30-40 g / m 2 ;

[0015] S4-2, dividing the surface of the polyester fabric into a printed area and a blank area, first covering the blank area with the A insulation material, and then subjecting the polyester fabric as a whole to a microwave heating at a temperature of 70 to 80°C, a power of 150 to 250 W, and a time of 5 to 10 minutes;

[0016] S4-3, then cover the printed area with insulation material B, and then perform a second microwave heating on the entire polyester fabric, the temperature of the second microwave heating is 95-105°C, the power is 350-450W, and the time is 2-5min;

[0017] S4-4, after the first and second microwave heating, the A and B insulation materials are removed, and the polyester fabric is subjected to steaming treatment at a temperature of 125 to 145° C. for 15 to 25 minutes;

[0018] S4-5. Finally, the polyester fabric is washed with clean water and dried to obtain the double-sided printed and dyed polyester fabric.

[0019] Furthermore, in step S1, the method for modifying the front side of the polyester fabric is:

[0020] Electrospinning is performed on the front side of the polyester fabric using the front spinning solution, the receiving distance is 16-18 cm, the voltage during the spinning process is 25-30 kV, the propulsion rate is 0.5-0.8 mL / h, the ambient temperature is 20-30 ° C, and the spinning humidity is 55-65%; after the electrospinning is completed, the modification treatment of the front side of the polyester fabric is completed;

[0021] The preparation method of the front spinning solution is as follows: lipase and deionized water containing acetone are mixed in a mass ratio of 1:15 to 20, and then the mixture is frozen to -80 to -60°C using liquid nitrogen, and then thawed at room temperature. After repeating the liquid nitrogen freezing and thawing for 5 to 7 times, the mixture is centrifuged, washed, and dried to obtain a solid; wherein the mass concentration of acetone in deionized water is 20 to 25%;

[0022] The solid is then mixed with tetraethoxysilane and a darkening agent in a mass ratio of 1:0.5:0.8-1 to obtain a front spinning solution.

[0023] Description: The mixture of lipase and deionized water containing acetone can introduce hydroxyl polar groups on the polyester surface. These groups can increase the roughness of the polyester surface, thereby improving the adsorption capacity and binding strength of the dye; through liquid nitrogen freeze-thaw treatment, the cell structure can be destroyed, more enzyme activity can be released, and its efficiency in subsequent reactions can be enhanced; tetraethoxysilane, as a cross-linking agent, can form a three-dimensional network structure on the polyester surface, enhance the binding force between the dye and the fiber, and improve the durability of the printing. The effect of the darkening agent on the surface roughness of the fabric is mainly reflected in the dense and uneven film formed on the fabric surface; in addition, the nanofiber structure formed by the electrospinning process, combined with the action of lipase, will form a rough microstructure on the polyester surface. Such a structure is conducive to the distribution of dye molecules on the fiber surface and improves the adhesion of the printing.

[0024] Furthermore, in step S2, the method for modifying the reverse side of the polyester fabric is:

[0025] Electrospinning is performed on the reverse side of the polyester fabric using the reverse spinning solution, the receiving distance is 16-18 cm, the voltage during the spinning process is 25-30 kV, the propulsion rate is 0.5-0.8 mL / h, the ambient temperature is 20-30 ° C, and the spinning humidity is 55-65%; after the electrospinning is completed, the modification treatment of the reverse side of the polyester fabric is completed;

[0026] The preparation method of the front spinning solution is as follows: lipase and deionized water containing acetone are mixed in a mass ratio of 1:15 to 20, and then the mixture is frozen to -80 to -60°C using liquid nitrogen, and then thawed at room temperature. After repeating the liquid nitrogen freezing and thawing for 5 to 7 times, the mixture is centrifuged, washed, and dried to obtain a solid; wherein the mass concentration of acetone in deionized water is 25 to 30%;

[0027] Then the solid is mixed with dopamine and a darkening agent in a mass ratio of 1:0.4:0.8-1 to obtain a reverse spinning solution.

[0028] Description: The mixture of lipase and deionized water containing acetone can introduce hydroxyl polar groups on the surface of polyester. These groups can increase the roughness of the polyester surface, thereby improving the adsorption capacity and binding strength of the dye; through liquid nitrogen freezing and thawing treatment, the cell structure can be destroyed, more enzyme activity can be released, and its efficiency in subsequent reactions can be enhanced; dopamine is a bioactive molecule that can self-polymerize on the surface of a variety of materials to form a film. This self-polymerization process usually leads to an increase in the roughness of the material surface. The effect of the darkening agent on the surface roughness of the fabric is mainly reflected in the dense and uneven film formed on the surface of the fabric; in addition, the nanofiber structure formed by the electrospinning process, combined with the action of lipase, will form a rough microstructure on the polyester surface. Such a structure helps the distribution of dye molecules on the fiber surface and improves the adhesion of the printing.

[0029] Furthermore, the darkening agent comprises, by mass percentage, 20-25% of methyl acrylate, 10-15% of hexadecyltrimethylammonium chloride, 2-5% of azobiscyanovaleric acid and the balance of deionized water.

[0030] Description: Methyl acrylate, as one of the monomers, can participate in the copolymerization reaction to form a polymer with good hydrophilicity, which is conducive to the diffusion and adsorption of dye molecules on the fiber, thereby improving the dyeing uniformity and coloring depth; hexadecyltrimethylammonium chloride can increase the positive charge density on the fiber surface, which is conducive to the adsorption of dyes on polyester fabrics and improves the color fastness; azobiscyanovaleric acid can form chemical cross-linking points on the fiber surface or inside, enhance the fiber network structure, and improve the wash fastness and dimensional stability after dyeing; the combined action of the above ingredients helps the penetration and fixation of the dye in the subsequent processing process.

[0031] Furthermore, the thermal insulation material A is made of a zirconia fiber reinforced carbon aerogel composite material with a thickness of 25 to 30 mm.

[0032] Description: This material has excellent microwave absorption and good thermal insulation properties, and is suitable for covering blank areas. It can effectively absorb microwave energy during microwave heating, reduce heat loss, and improve heating efficiency.

[0033] Furthermore, the B thermal insulation material is a MXene / C aerogel composite material with a thickness of 35 to 40 mm.

[0034] Description: MXene / C aerogel composites can provide good electromagnetic shielding effects, which helps to achieve more uniform heating in the printed area, while keeping the heat inside this area to avoid premature heat loss to the surrounding environment.

[0035] Further, after step S4-4 is completed, the polyester fabric after steaming is subjected to a primary ultraviolet radiation, and the primary ultraviolet radiation power is 400-600 W / cm 2 , the time is 30 to 40 minutes; then the polyester fabric after the ultraviolet radiation is immersed in the fluorine-free waterproof agent for padding treatment, and the pressure of the padding treatment is 0.8 to 1 kg / cm 2 The double roller axis speed is 1.5-2.5 m / min, the padding treatment time is 3-4 h, and the secondary ultraviolet radiation is carried out during the padding process. The secondary ultraviolet radiation power is 100-200 W / cm 2 , the time is 25 to 35 minutes.

[0036] Description: UV radiation can promote the chemical reaction between the fluorine-free waterproofing agent and the surface of polyester fibers, enhance the formation of chemical bonds between the waterproofing agent molecules and the fibers, thereby improving the adhesion and durability of the waterproofing agent. UV radiation can improve the uniformity of the distribution of the waterproofing agent on the fabric surface, ensuring the consistency of the waterproofing performance, especially in the transition area between the printed area and the blank area; UV radiation can activate the reactive groups in the waterproofing agent, promote its cross-linking with the fiber surface, enhance the surface hydrophobicity of the fabric, thereby significantly improving its water repellency, and can make the waterproofing agent more firmly adhere to the fabric surface, improve its washability and friction performance, and prolong the duration of the waterproofing effect.

[0037] Compared with the existing double-sided printed and dyed polyester fabric, the beneficial effects of the present invention are:

[0038] (1) The present invention divides the surface of the polyester fabric into a printed area and a blank area. Due to the differences in material and structure between the printed area and the blank area, their sensitivity to heat is also different. Step-by-step heating can prevent a certain area from being damaged due to overheating while ensuring that another area reaches an ideal heating state. Therefore, the thermal insulation material covers the blank area during the first heating, which can effectively reduce the heat loss from the blank area, so that more energy is absorbed by the printed area, thereby improving the efficiency of the initial heating. After the initial heating, the printed area is also covered for secondary heating, which can further reduce heat loss. At the same time, the residual heat from the initial heating is utilized to reduce additional energy consumption, thereby improving the overall heating efficiency, so as to achieve more precise temperature control, thereby improving the uniformity of the overall temperature distribution on the surface of the polyester fabric.

[0039] (2) The present invention uses lipase and a darkening agent to modify the surface of polyester fabric. The mixture of lipase and deionized water containing acetone can introduce hydroxyl polar groups on the polyester surface. These groups can increase the roughness of the polyester surface, thereby improving the adsorption capacity and binding strength of the dye; through repeated treatment of liquid nitrogen freezing and thawing, the cell structure can be destroyed, more enzyme activity can be released, and its efficiency in subsequent reactions can be enhanced; tetraethoxysilane is used as a cross-linking agent to form a three-dimensional network structure on the polyester surface, enhance the binding force between the dye and the fiber, and improve the durability of the printing; dopamine is a bioactive molecule that can self-polymerize on the surface of various materials to form a film. This self-polymerization process usually leads to an increase in the roughness of the material surface. The effect of the darkening agent on the surface roughness of the fabric is mainly reflected in the dense and uneven film formed on the surface of the fabric; in addition, the nanofiber structure formed by the electrospinning process, combined with the action of lipase, will form a rough microstructure on the polyester surface. Such a structure helps the distribution of dye molecules on the fiber surface and improves the adhesion of the printing. DETAILED DESCRIPTION

[0040] In order to further illustrate the method and effect of the present invention, the technical solution of the present invention will be clearly and completely described in combination with experiments.

[0041] Embodiment 1: A high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency, comprising the following steps:

[0042] S1. Surface modification:

[0043] The front and back sides of the polyester fabric are subjected to surface modification treatment respectively;

[0044] The method for modifying the front side of polyester fabric is:

[0045] Electrospinning was performed on the front side of the polyester fabric using the front spinning solution, with a receiving distance of 17 cm, a voltage of 28 kV, a propulsion rate of 0.7 mL / h, an ambient temperature of 25 ° C, and a spinning humidity of 60% during the spinning process; after the electrospinning was completed, the modification treatment of the front side of the polyester fabric was completed;

[0046] The preparation method of the front spinning solution is as follows: lipase and deionized water containing acetone are mixed in a mass ratio of 1:18, and then liquid nitrogen is used to freeze to -70°C, and then melted at room temperature, and the liquid nitrogen freezing and melting are repeated 6 times, and then the solid is centrifuged, washed, and dried to obtain a solid; wherein the mass concentration of acetone in deionized water is 23%. It can be understood that repeating liquid nitrogen freezing and melting 6 times means that the two steps of liquid nitrogen freezing and then melting at room temperature are completed continuously, which is counted as one liquid nitrogen freezing and melting, and 6 times means that the two steps of liquid nitrogen freezing and then melting at room temperature are completed 6 times in a row;

[0047] Then, the solid is mixed with tetraethoxysilane and a darkening agent in a mass ratio of 1:0.5:0.9 to obtain a front spinning solution;

[0048] The method for modifying the reverse side of polyester fabric is:

[0049] Electrospinning was performed on the reverse side of the polyester fabric using the reverse spinning solution, with a receiving distance of 17 cm, a voltage of 28 kV, a propulsion rate of 0.7 mL / h, an ambient temperature of 25 ° C, and a spinning humidity of 60% during the spinning process; after the electrospinning was completed, the modification treatment of the reverse side of the polyester fabric was completed;

[0050] The preparation method of the reverse spinning solution is as follows: lipase and deionized water containing acetone are mixed in a mass ratio of 1:18, and then the mixture is frozen to -70°C using liquid nitrogen, and then thawed at room temperature. After repeating the liquid nitrogen freezing and thawing for 6 times, the mixture is centrifuged, washed, and dried to obtain a solid. The mass concentration of acetone in deionized water is 28%.

[0051] Then, the solid is mixed with dopamine and a darkening agent in a mass ratio of 1:0.4:0.9 to obtain a reverse spinning solution;

[0052] The darkening agent comprises, by mass percentage, 23% methyl acrylate, 13% hexadecyltrimethylammonium chloride, 3.5% azobiscyanovaleric acid and the balance deionized water;

[0053] S2, preparing front printing dye solution:

[0054] By weight, 18 parts of active yellow K-6G dye, 5 parts of anhydrous ethanol, and 18 parts of deionized water were stirred and mixed to obtain a mixed solution A, and then 0.6 parts of sodium polystyrene sulfonate, 2 parts of paraffin wax, and 1.5 parts of hexamethylol melamine were added to the mixed solution A and stirred and mixed to obtain a front printing dye solution;

[0055] S3, preparing reverse printing dye solution:

[0056] By weight, 15 parts of active turquoise K-GL dye, 4 parts of anhydrous ethanol and 14 parts of deionized water are stirred and mixed to obtain a mixed solution B, and then 0.45 parts of polyvinyl pyrrolidone, 2 parts of thiophenol and 1.5 parts of nano-silicon dioxide are added to the mixed solution B and stirred and mixed to obtain a reverse printing dye solution; the particle size of the nano-silicon dioxide is 50-60 nm;

[0057] S4, double-sided printing and dyeing:

[0058] S4-1, using a digital printing machine to spray the front printing dye prepared in step S2 on the front side of the polyester fabric, and the back printing dye prepared in step S3 on the back side of the polyester fabric, with the spraying amount of both being 35 g / m 2 ;

[0059] S4-2, the surface of the polyester fabric is divided into a printed area and a blank area, the blank area is first covered with thermal insulation material A, and then the polyester fabric is subjected to microwave heating once, the microwave heating temperature is 75°C, the power is 200W, and the time is 8min; the thermal insulation material A is a zirconia fiber reinforced carbon aerogel composite material with a thickness of 28mm;

[0060] S4-3, the printed area is covered with thermal insulation material B, and the polyester fabric is subjected to secondary microwave heating as a whole, the temperature of the secondary microwave heating is 100° C., the power is 400 W, and the time is 4 minutes; the thermal insulation material B is a MXene / C aerogel composite material with a thickness of 38 mm;

[0061] S4-4, after the first and second microwave heating, the A and B insulation materials are removed, and the polyester fabric is subjected to steaming treatment at a temperature of 130° C. for 20 minutes;

[0062] S4-5. Finally, the polyester fabric is washed with clean water and dried at 60° C. for 4 h to obtain a double-sided printed polyester fabric.

[0063] Example 2: This example is different from Example 1 in that lipase and deionized water containing acetone are mixed in a mass ratio of 1:15, wherein the mass concentration of acetone in the deionized water is 20%.

[0064] Example 3: This example is different from Example 1 in that lipase and deionized water containing acetone are mixed in a mass ratio of 1:20, wherein the mass concentration of acetone in the deionized water is 25%.

[0065] Example 4: This example is different from Example 1 in that liquid nitrogen is used to freeze to -60°C and then thawed at room temperature, and the liquid nitrogen freezing and thawing are repeated 5 times.

[0066] Example 5: This example is different from Example 1 in that liquid nitrogen is used to freeze to -80°C and then thawed at room temperature, and the liquid nitrogen freezing and thawing are repeated 7 times.

[0067] Example 6: This example is different from Example 1 in that the solid is mixed with tetraethoxysilane and a darkening agent in a mass ratio of 1:0.5:0.8 to obtain a front spinning solution.

[0068] Example 7: This example is different from Example 1 in that the solid, tetraethoxysilane and the darkening agent are mixed in a mass ratio of 1:0.5:1 to obtain the front spinning solution.

[0069] Example 8: This example is different from Example 1 in that electrospinning is carried out on the front side of the polyester fabric using the front spinning solution, the receiving distance is 16 cm, the voltage during the spinning process is 25 kV, the propulsion rate is 0.5 mL / h, the ambient temperature is 20°C, and the spinning humidity is 55%.

[0070] Example 9: This example is different from Example 1 in that electrospinning is carried out on the front side of the polyester fabric using the front spinning solution, the receiving distance is 18 cm, the voltage during the spinning process is 30 kV, the propulsion rate is 0.8 mL / h, the ambient temperature is 30°C, and the spinning humidity is 65%.

[0071] Example 10: This example is different from Example 1 in that lipase and deionized water containing acetone are mixed in a mass ratio of 1:15, wherein the mass concentration of acetone in the deionized water is 25%.

[0072] Example 11: This example is different from Example 1 in that lipase and deionized water containing acetone are mixed in a mass ratio of 1:20, wherein the mass concentration of acetone in the deionized water is 30%.

[0073] Example 12: This example is different from Example 1 in that liquid nitrogen is used to freeze the mixture to -60°C and then thaw it at room temperature, and the liquid nitrogen freezing and thawing are repeated 5 times.

[0074] Example 13: This example is different from Example 1 in that liquid nitrogen is used to freeze the mixture to -80°C and then thawed at room temperature, and the liquid nitrogen freezing and thawing are repeated 7 times.

[0075] Example 14: This example is different from Example 1 in that the solid is mixed with dopamine and a darkening agent in a mass ratio of 1:0.4:0.8 to obtain a reverse spinning solution.

[0076] Example 15: This example is different from Example 1 in that the solid is mixed with dopamine and a darkening agent in a mass ratio of 1:0.4:1 to obtain a reverse spinning solution.

[0077] Example 16: This example differs from Example 1 in that electrospinning is carried out on the back side of the polyester fabric using the reverse spinning solution, the receiving distance is 16 cm, the voltage during the spinning process is 25 kV, the propulsion rate is 0.5 mL / h, the ambient temperature is 20°C, and the spinning humidity is 55%.

[0078] Example 17: This example is different from Example 1 in that electrospinning is carried out on the back side of the polyester fabric using the reverse spinning solution, the receiving distance is 18 cm, the voltage during the spinning process is 30 kV, the propulsion rate is 0.8 mL / h, the ambient temperature is 30°C, and the spinning humidity is 65%.

[0079] Example 18: This example is different from Example 1 in that 15 parts of active yellow K-6G dye, 6 parts of anhydrous ethanol, and 20 parts of deionized water are stirred and mixed to obtain a mixed solution A, and then 0.5 parts of sodium polystyrene sulfonate, 3 parts of paraffin, and 2 parts of hexahydroxymethyl melamine hexmethoxy ether are added to the mixed solution A and stirred and mixed to obtain a mixed solution A.

[0080] Example 19: This example is different from Example 1 in that 20 parts of active yellow K-6G dye, 4 parts of anhydrous ethanol, and 15 parts of deionized water are stirred and mixed to obtain a mixed solution A, and then 0.7 parts of sodium polystyrene sulfonate, 1 part of paraffin, and 1 part of hexahydroxymethyl melamine hexmethoxy ether are added to the mixed solution A and stirred to mix evenly.

[0081] Example 20: This example is different from Example 1 in that 10 parts of active turquoise K-GL dye, 5 parts of anhydrous ethanol, and 16 parts of deionized water are stirred and mixed uniformly to obtain a mixed solution B, and then 0.4 parts of polyvinyl pyrrolidone, 3 parts of thiophenol, and 2 parts of nano-silica are added to the mixed solution B and stirred and mixed uniformly.

[0082] Example 21: This example is different from Example 1 in that 20 parts of active turquoise K-GL dye, 3 parts of anhydrous ethanol, and 12 parts of deionized water are stirred and mixed uniformly to obtain a mixed solution B, and then 0.5 parts of polyvinyl pyrrolidone, 1 part of thiophenol, and 1 part of nano-silica are added to the mixed solution B and stirred and mixed uniformly.

[0083] Example 22: This example is different from Example 1 in that the front printing dye liquid prepared in step S2 is sprayed on the front side of the polyester fabric, and the dye prepared in step S3 is sprayed on the back side of the polyester fabric using a digital printing machine, and the spraying amount is 30 g / m 2 .

[0084] Example 23: This example is different from Example 1 in that the front printing dye liquid prepared in step S2 is sprayed on the front side of the polyester fabric, and the dye prepared in step S3 is sprayed on the back side of the polyester fabric using a digital printing machine, and the spraying amount is 40g / m 2 .

[0085] Example 24: This example is different from Example 1 in that the temperature of a microwave heating is 70°C, the power is 150W, and the time is 5 minutes.

[0086] Example 25: This example is different from Example 1 in that the temperature of a microwave heating is 80°C, the power is 250W, and the time is 10 minutes.

[0087] Example 26: This example is different from Example 1 in that the temperature of the secondary microwave heating is 95°C, the power is 350W, and the time is 2min.

[0088] Example 27: This example is different from Example 1 in that the temperature of the secondary microwave heating is 105°C, the power is 450W, and the time is 5 minutes.

[0089] Example 28: This example is different from Example 1 in that the thermal insulation material A adopts a zirconia fiber reinforced carbon aerogel composite material with a thickness of 25 mm, and the thermal insulation material B adopts a MXene / C aerogel composite material with a thickness of 40 mm.

[0090] Example 29: This example is different from Example 1 in that the thermal insulation material A adopts a zirconia fiber reinforced carbon aerogel composite material with a thickness of 30 mm, and the thermal insulation material B adopts a MXene / C aerogel composite material with a thickness of 35 mm.

[0091] Example 30: This example is different from Example 1 in that the temperature of the steaming treatment is 125°C and the time of the steaming treatment is 15 minutes.

[0092] Example 31: This example is different from Example 1 in that the temperature of the steaming treatment is 145°C and the time of the steaming treatment is 25 minutes.

[0093] Example 32: This example is different from Example 1 in that after step S4-4, the polyester fabric after steaming is subjected to a first ultraviolet radiation, and the power of the first ultraviolet radiation is 500 W / cm 2 , the time is 35min; then the polyester fabric after the ultraviolet radiation is immersed in the fluorine-free waterproof agent for padding treatment. The fluorine-free waterproof agent can be selected from XF-5003 waterproof agent. The pressure of the padding treatment is 0.9kg / cm 2 The double roller axis speed is 2m / min, the padding treatment time is 3.5h, and the secondary ultraviolet radiation is carried out during the padding process. The secondary ultraviolet radiation power is 150W / cm 2 , time is 30 minutes.

[0094] Example 33: This example is different from Example 32 in that the UV primary radiation power is 400 W / cm 2 , time is 30 minutes.

[0095] Example 34: This example differs from Example 32 in that the primary ultraviolet radiation power is 600 W / cm 2 , time is 40 minutes.

[0096] Example 35: This example is different from Example 32 in that the polyester fabric after the ultraviolet radiation is immersed in a fluorine-free waterproofing agent for padding treatment, and the pressure of the padding treatment is 0.8 kg / cm 2 , the double roller axis speed is 1.5m / min, and the padding treatment time is 3h.

[0097] Example 36: This example is different from Example 32 in that the polyester fabric after the ultraviolet radiation is immersed in a fluorine-free waterproofing agent for padding treatment, and the pressure of the padding treatment is 1kg / cm 2 , the double roller axis speed is 2.5m / min, and the padding treatment time is 4h.

[0098] Example 37: This example differs from Example 32 in that the secondary ultraviolet radiation power is 100 W / cm 2 , time is 25 minutes.

[0099] Example 38: This example differs from Example 32 in that the secondary ultraviolet radiation power is 200 W / cm 2 , time is 35 minutes.

[0100] Experimental Example: The description of this experimental example is based on the scheme described in Example 1, and is intended to illustrate the practical application effect of the present invention.

[0101] The water repellency of the polyester fabrics in each embodiment and comparative example was tested according to GB / T4745-2012 "Testing and evaluating the waterproof performance of textiles - water dipping method", and the water repellency of the polyester fabrics was tested again after washing 20 times, which was used as a reference for the water washability of the polyester fabrics.

[0102] 1. To explore the effect of surface modification on the water repellency and washability of polyester fabrics.

[0103] Table 1 Effects of Examples 1 to 17 and Comparative Examples 1 to 2 on Water Repellency and Washability of Polyester Fabrics

[0104]

[0105]

[0106] The difference between Control Example 1 and Example 1 is that the front spinning solution or the back spinning solution does not include lipase;

[0107] The difference between Control Example 2 and Example 1 is that the lipase is not subjected to liquid nitrogen freeze-thaw;

[0108] From the comparison of the results in Table 1, it can be seen that the control example 1 lacks lipase, and the control example 2 lacks liquid nitrogen freeze-thaw treatment of the lipase, which significantly reduces the water repellency and washability of the polyester fabric compared with Examples 1 to 17. Therefore, lipase and liquid nitrogen freeze-thaw treatment of lipase have a significant effect on the surface modification of polyester fabrics;

[0109] By comparing Examples 1 to 17, it can be seen that if the parameters of the modification treatment are too low or too high, the water repellency and water resistance of the polyester fabric will be affected. Among them, the water repellency of several embodiments (such as Examples 2, 3 and 5, etc.) is as high as that of Example 1, but after washing 20 times, the water resistance decreases. Therefore, the parameter effect of Example 1 is relatively better.

[0110] 2. Investigate the effect of double-sided printing and dyeing on the water repellent and washability of polyester fabrics.

[0111] Table 2 Effect of Examples 18 to 31 and Comparative Examples 3 to 4 on Water Repellency and Washability of Polyester Fabric

[0112]

[0113]

[0114] The difference between the comparative example 3 and the embodiment 1 is that the blank area is not covered with the thermal insulation material A;

[0115] The difference between the comparative example 4 and the embodiment 1 is that the printing area is not covered with the thermal insulation material B;

[0116] From the results in Table 2, it can be seen that the control example 3 lacks the coverage of the blank area, and the control example 4 lacks the coverage of the printed area, which affects the microwave heating efficiency and the subsequent steaming treatment efficiency. Therefore, the polyester fabric is unevenly heated as a whole, and the water repellency is unevenly distributed, thereby reducing the water repellency and water washability of the polyester fabric compared with Examples 18 to 31.

[0117] By comparing Examples 18 to 31, it can be seen that if the parameters of double-sided printing and dyeing are too small or too large, the water repellency and water resistance of polyester fabric will be affected. Among them, the water repellency of several embodiments (such as Examples 23 and 26, etc.) is as high as that of Example 1, but after washing 20 times, the water resistance decreases. Therefore, the parameter effect of Example 1 is relatively better.

[0118] 3. Investigate the effect of double-sided printing and dyeing on the water repellent and washability of polyester fabrics.

[0119] Table 3 Effect of Examples 32-38 and Comparative Examples 5-7 on Water Repellency and Washability of Polyester Fabric

[0120]

[0121] The difference between Control Example 5 and Example 1 is that no pre-irradiation is performed;

[0122] The difference between Comparative Example 6 and Example 1 is that padding is not performed;

[0123] The difference between Comparative Example 7 and Example 1 is that no secondary radiation is performed;

[0124] From the results in Table 3, it can be seen that Examples 32 to 38 significantly improve the water repellency and water washing resistance compared with Examples 1 to 31, while Control Example 5 lacks the primary ultraviolet radiation before padding, Control Example 6 lacks padding, and Control Example 7 lacks the secondary ultraviolet radiation during padding, which reduces the water repellency and water washing resistance compared with Examples 32 to 38. Therefore, the primary ultraviolet radiation before padding, padding, and the secondary ultraviolet radiation during padding can all play a certain role in improving the water repellency and water washing resistance of polyester fabrics.

[0125] By comparing Examples 32 to 38, it can be seen that parameters of the primary ultraviolet radiation that are too small or too large, parameters of the immersion padding that are too small or too large, and parameters of the secondary ultraviolet radiation that are too small or too large will all reduce the improvement in the water repellency and washability of the polyester fabric. Therefore, in comprehensive comparison, the parameter effect of Example 32 is relatively better.

Claims

1. A high-efficiency double-sided printing and dyeing process for polyester fabrics with enhanced printed water repellency, characterized in that: The following steps are involved: S1. Surface modification: The front and back sides of the polyester fabric are subjected to surface modification treatment respectively; S2, preparing front printing dye solution: By weight, 15 to 20 parts of active yellow K-6G dye, 4 to 6 parts of anhydrous ethanol, and 15 to 20 parts of deionized water are stirred and mixed to obtain a mixed solution A, and then 0.5 to 0.7 parts of sodium polystyrene sulfonate, 1 to 3 parts of paraffin wax, and 1 to 2 parts of hexamethylol melamine are added to the mixed solution A and stirred and mixed to obtain a front printing dye solution; S3, preparing reverse printing dye solution: By weight, 10 to 20 parts of active turquoise K-GL dye, 3 to 5 parts of anhydrous ethanol, and 12 to 16 parts of deionized water are stirred and mixed uniformly to obtain a mixed solution B, and then 0.4 to 0.5 parts of polyvinyl pyrrolidone, 1 to 3 parts of thiophenol, and 1 to 2 parts of nano silicon dioxide are added to the mixed solution B and stirred and mixed uniformly to obtain a reverse printing dye solution; S4, double-sided printing and dyeing: S4-1, using a digital printing machine to spray the front printing dye prepared in step S2 on the front side of the polyester fabric, and spray the back printing dye prepared in step S3 on the back side of the polyester fabric, with the spraying amount being 30-40 g / m 2 ; S4-2, dividing the surface of the polyester fabric into a printed area and a blank area, first covering the blank area with the A insulation material, and then subjecting the polyester fabric as a whole to a microwave heating at a temperature of 70 to 80°C, a power of 150 to 250 W, and a time of 5 to 10 minutes; S4-3, then cover the printed area with insulation material B, and then perform a second microwave heating on the entire polyester fabric, the temperature of the second microwave heating is 95-105°C, the power is 350-450W, and the time is 2-5min; S4-4, after the first and second microwave heating, the A and B insulation materials are removed, and the polyester fabric is subjected to steaming treatment at a temperature of 125 to 145° C. for 15 to 25 minutes; S4-5. Finally, the polyester fabric is washed with clean water and dried to obtain the double-sided printed and dyed polyester fabric.

2. A high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 1, characterized in that: In step S1, the method for modifying the front side of the polyester fabric is: Electrospinning is performed on the front side of the polyester fabric using the front spinning solution, the receiving distance is 16-18 cm, the voltage during the spinning process is 25-30 kV, the propulsion rate is 0.5-0.8 mL / h, the ambient temperature is 20-30 ° C, and the spinning humidity is 55-65%; after the electrospinning is completed, the modification treatment of the front side of the polyester fabric is completed; The preparation method of the front spinning solution is as follows: lipase and deionized water containing acetone are mixed in a mass ratio of 1:15 to 20, and then the mixture is frozen to -80 to -60°C using liquid nitrogen, and then thawed at room temperature. After repeating the liquid nitrogen freezing and thawing for 5 to 7 times, the mixture is centrifuged, washed, and dried to obtain a solid; wherein the mass concentration of acetone in deionized water is 20 to 25%; Then the solid is mixed with tetraethoxysilane and a darkening agent in a mass ratio of 1:0.5:0.8-1 to obtain a front spinning solution.

3. A high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 2, characterized in that: In step S2, the method for modifying the reverse side of the polyester fabric is: Electrospinning is performed on the reverse side of the polyester fabric using the reverse spinning solution, the receiving distance is 16-18 cm, the voltage during the spinning process is 25-30 kV, the propulsion rate is 0.5-0.8 mL / h, the ambient temperature is 20-30 ° C, and the spinning humidity is 55-65%; after the electrospinning is completed, the modification treatment of the reverse side of the polyester fabric is completed; The preparation method of the reverse spinning solution is as follows: lipase and deionized water containing acetone are mixed in a mass ratio of 1:15 to 20, and then the mixture is frozen to -80 to -60°C using liquid nitrogen, and then thawed at room temperature, and after repeating the liquid nitrogen freezing and thawing for 5 to 7 times, the mixture is centrifuged, washed, and dried to obtain a solid; wherein the mass concentration of acetone in deionized water is 25 to 30%; Then the solid is mixed with dopamine and a darkening agent in a mass ratio of 1:0.4:0.8-1 to obtain a reverse spinning solution.

4. A high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 3, characterized in that: The darkening agent comprises, by mass percentage, 20-25% of methyl acrylate, 10-15% of hexadecyltrimethylammonium chloride, 2-5% of azobiscyanovaleric acid and the balance of deionized water.

5. The high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 1, characterized in that: The thermal insulation material A is a zirconium oxide fiber reinforced carbon aerogel composite material with a thickness of 25 to 30 mm.

6. The high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 1, characterized in that: The B thermal insulation material is a MXene / C aerogel composite material with a thickness of 35 to 40 mm.

7. The high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 1, characterized in that: After step S4-4 is completed, the polyester fabric after steaming is subjected to a primary ultraviolet radiation, and the primary ultraviolet radiation power is 400-600 W / cm 2 , the time is 30 to 40 minutes; then the polyester fabric after the ultraviolet radiation is immersed in the fluorine-free waterproof agent for padding treatment, and the pressure of the padding treatment is 0.8 to 1 kg / cm 2 The double roller axis speed is 1.5-2.5 m / min, the padding treatment time is 3-4 h, and the secondary ultraviolet radiation is carried out during the padding process. The secondary ultraviolet radiation power is 100-200 W / cm 2 , time is 25 to 35 minutes.

8. The high-efficiency double-sided printing and dyeing process for polyester fabric with enhanced printed water repellency as claimed in claim 2, characterized in that: The mass concentration of the acetone in deionized water is 20-25%.

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