Washable microcapsule PCM constant-temperature cool-feeling fabric and preparation method thereof

Abstract

The invention relates to the technical field of textiles, in particular to a washable microcapsule PCM constant-temperature cool-feeling fabric and a preparation method thereof.The washable microcapsule PCM constant-temperature cool-feeling fabric is prepared from, by mass, 0-25% of spandex and the balance nylon through weft knitting, printed patterns coated on the surface of the gray fabric and phase-change microcapsules arranged on the surface of the gray fabric; the average distribution density of the phase change microcapsules is 15-50g / m < 2 >, and the average diameter of the phase change microcapsules is 1-10 microns; pCM in the phase change microcapsules is subjected to phase change at a specific temperature to absorb or release heat, so that the fabric is kept in a constant comfortable temperature range, and a cool constant-temperature experience is provided; the average distribution density of 15-50g / m < 2 > ensures that enough amount of microcapsules cover the fabric, an effective heat energy exchange layer can be formed between a human body and the environment, and efficient temperature regulation is realized; the diameter of the microcapsules is controlled to ensure that the microcapsules are uniformly dispersed in the fabric, and the influence on the hand feeling and air permeability of the fabric is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a washable microcapsule PCM constant temperature cool fabric and a preparation method thereof. Background Art

[0002] In the field of textiles, with the improvement of people's living standards and the enhancement of health awareness, functional textiles, especially cooling fabrics with temperature regulation function, have received extensive attention. However, the performance and durability of cooling fabrics in the prior art have certain limitations.

[0003] The cooling effect provided by traditional physical methods or chemical additives often relies on the physical properties of the material, such as thermal conductivity, but cannot achieve active temperature regulation, that is, actively absorbing or releasing heat when the temperature changes. Adding metal fibers can improve the active temperature regulation ability of cooling fabrics, but the addition of materials such as metal fibers will cause the fabric to feel harder and reduce wearing comfort. Adding too little will affect the fabric's temperature regulation ability. Fabrics with added chemical additives are easily lost after multiple washes, causing the cooling effect to weaken or disappear, affecting the fabric's water resistance. When the ambient temperature changes greatly, the cooling effect of traditional cooling fabrics may be unstable and cannot meet all-weather contact needs.

[0004] The constant temperature and cooling fabric technology of microcapsule phase change material PCM is to encapsulate PCM in microcapsules, and then evenly disperse these microcapsules in the fabric fibers, using the phase change characteristics of PCM to achieve the temperature regulation function of the fabric. When PCM changes phase between solid and liquid, it can absorb or release a large amount of heat, thereby actively regulating the temperature of the fabric when the temperature changes, providing a continuous cooling effect. However, the existing microcapsule PCM constant temperature and cooling fabrics have poor durability and are prone to liquid leakage after washing, affecting the long-term use of the fabric. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a washable microcapsule PCM constant temperature cool fabric and a preparation method thereof.

[0006] The technical scheme of the present invention is: a washable microcapsule PCM constant temperature cool fabric, which comprises, by mass percentage, a grey fabric made of 0-25% spandex and the remainder nylon weft knitting, a print coated on the surface of the grey fabric, and a phase change microcapsule arranged on the surface of the grey fabric; the average distribution density of the phase change microcapsule is 15-50g / m 2 The average diameter of the phase change microcapsules is 1 to 10 μm.

[0007] Description: PCM in phase change microcapsules undergoes phase change at a specific temperature, which can absorb or release heat, thereby helping the fabric to maintain a constant comfortable temperature range and provide a cool feeling. The addition of spandex increases the elasticity of the fabric, and the distribution density of phase change microcapsules directly affects its temperature regulation ability. 15-50g / m 2 The average distribution density ensures that a sufficient number of microcapsules cover the fabric, which can form an effective heat exchange layer between the human body and the environment, thereby achieving efficient temperature regulation; the microcapsule diameter of 1 to 10 μm can ensure that the microcapsules are evenly dispersed in the fabric, while reducing the impact on the feel and air permeability of the fabric. The smaller diameter helps to improve the dispersion of the microcapsules in the fabric, ensuring the uniformity of the temperature regulation effect and the overall comfort of the fabric.

[0008] The present invention also provides a method for preparing the washable microcapsule PCM constant temperature cool fabric, comprising the following steps:

[0009] S1. Weaving grey fabric

[0010] The spandex and nylon are introduced into a knitting machine according to a formula ratio for weft knitting to obtain a grey fabric;

[0011] S2, pre-setting and anti-yellowing pre-treatment

[0012] The grey fabric is placed in a width-opening machine for pre-setting, the pre-setting time is 2 to 5 minutes, and an anti-yellowing agent a is added during the pre-setting process to obtain a pre-treated fabric; the temperature of the width-opening machine is 190 to 200° C., and the feeding speed is 20 to 30 m / min;

[0013] S3, dyeing and finishing

[0014] The pretreated fabric is subjected to acid dyeing and finishing at a temperature of 90 to 100° C. for 5 to 30 minutes, and then the temperature is reduced to 50 to 80° C. and kept at this temperature for 15 to 25 minutes to obtain a dyed fabric;

[0015] S4. Drying

[0016] Drying the dyed cloth at a temperature of 150 to 170° C. to obtain a dried dyed cloth, wherein the feed speed of the dryer is 25 to 35 m / min and the drying time is 1 to 2 min;

[0017] S5, Printing Process

[0018] Prepare a printing paste with phase change microcapsules, introduce it into a magnetic rod printing machine, and then print the dried dyed cloth to obtain a printed cloth; then bake the printed cloth to obtain a baked printed cloth, the baking temperature is 100-120° C., and the baking time is 2-3 minutes;

[0019] S6. Reshaping

[0020] The baked printed fabric is shaped at a temperature of 140-160° C. for 2-3 minutes at a shaping speed of 18-20 m / min to obtain a washable microcapsule PCM fabric.

[0021] Description: Adding anti-yellowing agent during the pre-setting process can effectively prevent the fabric from yellowing under long-term use or high temperature conditions, maintain the color and beauty of the fabric, and extend the fabric's water resistance. Acid dyeing and finishing treatment can fully combine the dye with the fabric at high temperature, improve the color saturation and color fastness of the fabric, and the color of the fabric remains bright even after multiple washings. Rapid drying at a high temperature of 150-170°C can ensure that the moisture of the fabric evaporates quickly to avoid shrinkage and deformation. The printing paste with phase change microcapsules can not only provide additional aesthetic effects, but also further enhance the temperature regulation performance of the fabric. Through baking, the phase change microcapsules are more closely combined with the fabric, which enhances the water resistance of the microcapsules. The re-setting process can further fix the shape and size of the fabric and improve the stability and durability of the fabric. Through the above process, the fabric not only has good temperature regulation performance, but also maintains high elasticity, softness and breathability, and has excellent color fastness, anti-yellowing and water resistance.

[0022] Furthermore, the weft knitting in S1 has a weaving density of 30 to 50 needles per inch.

[0023] Note: A higher weaving density means more yarns per unit area and a tighter fabric structure, which usually leads to higher physical strength, making the fabric more wear-resistant and less likely to tear.

[0024] Furthermore, the anti-yellowing agent a in S2 is a mixture of anti-yellowing powder and water, and the concentration of the anti-yellowing powder is 200-300 g / L; the anti-yellowing powder is HN-150 anti-yellowing powder.

[0025] Description: AOP anti-yellowing powder can effectively prevent or slow down the yellowing of acid dyed and finished fabrics during production and storage, prolong the fabric's resistance to water washing and maintain its original color; controlling the concentration of AOP anti-yellowing powder and water can enable it to play a better anti-yellowing role.

[0026] Furthermore, the dye used in the acid dyeing and finishing described in S3 is a mixture of a dye and an anti-yellowing agent b, and the mass ratio of the two is 1:3-5; the anti-yellowing agent b is anti-yellowing agent 0328.

[0027] Description: Anti-yellowing agent 0328 can significantly reduce the yellowing of acid dyed and finished fabrics caused by oxidation, light and other factors during processing, storage or transportation; by adding anti-yellowing agent during the dyeing process, it can promote the dye to adhere to the fiber more evenly, thereby improving the consistency and aesthetics of the dyeing effect; by inhibiting yellowing, it can reduce the defective rate caused by yellowing.

[0028] Furthermore, the mesh size of the round screen in the magnetic bar printing machine in S5 is 100-110 meshes, the pressure of the magnetic bar is 30-40 Pa, and the feeding speed of the magnetic bar printing machine is 25-35 m / min.

[0029] Description: The mesh size of the round screen is 100-110 meshes. This mesh size is suitable for printing patterns with clear details, because the medium-sized mesh can balance the printing quality and ink transfer rate, and the finer mesh can provide a finer printing effect, which is suitable for complex or delicate designs; control the magnetic rod pressure at 30-40Pa: appropriate magnetic rod pressure helps to ensure that the color paste can pass through the mesh evenly, while avoiding excessive squeezing and causing the loss of color paste or mesh blockage; this pressure range is conducive to achieving good color paste transfer and printing effects; the appropriate feed speed is crucial to maintaining printing quality; too fast speed may cause uneven printing, while too slow speed will reduce production efficiency. Controlling the appropriate speed can both ensure printing quality and maintain high production efficiency.

[0030] Furthermore, in terms of mass percentage, the printing paste in S5 is composed of 30-35% of a cross-linking agent, 30-45% of phase change microcapsules, 2-3% of a thickener, 0.1-0.3% of a curing agent, 0.1-0.3% of a hydrophilic agent, 1-2% of an auxiliary agent and the remainder of a pigment solution; the auxiliary agent is a combination of one or more of a preservative, a defoaming agent and a binder.

[0031] Description: A proper amount of cross-linking agent can promote the combination of dye and fiber and improve the color fastness of printing. A high proportion of cross-linking agent ensures that the printing and microcapsules are not easy to fade during washing and daily use, and enhances the durability of the pattern. Phase change material microcapsules can absorb and release heat, provide additional temperature regulation function, and increase the comfort and functionality of the fabric. Even at a ratio as low as 0.1%, the touch of the fabric can be significantly improved; and an addition of up to 17% is suitable for high-end products with higher requirements for softness. The use of thickeners can adjust the viscosity of the printing paste to ensure that the paste can stably adhere to the fabric during the printing process, reduce penetration and diffusion, and improve the clarity and detail of the printing. The combined use of auxiliary agents can further optimize the performance of the printing paste, prevent microbial growth, control foam, enhance the combination of dye and fabric, and accelerate the color fixing process to ensure the stability and efficiency of the printing effect. The pigment solution, as the remaining part, provides the color basis of the printing; its proportion is determined according to the addition amount of cross-linking agent, phase change microcapsules and other ingredients to ensure the saturation and uniformity of the color.

[0032] Furthermore, the preparation method of the phase change microcapsules described in S5 is: disperse PCM nanoparticles in water to form a stable emulsion, and then add a surfactant accounting for 0.1 to 8% of the total mass of the emulsion; mix the emulsion and the water-soluble polymer solution in a mass ratio of 1:5 to 10, and then perform ultrasonic treatment for 10 to 30 minutes; remove and wash the microcapsules by centrifugation or filtration, and obtain phase change microcapsules after drying; the water-soluble polymer solution is one or a combination of polyvinyl alcohol and polyethylene glycol.

[0033] Description: By adding surfactants to the emulsion, the dispersion stability of PCM nanoparticles in the water phase can be significantly improved, the particles can be prevented from agglomerating, and the uniform distribution of PCM inside the microcapsule can be ensured; the emulsion is mixed with a water-soluble polymer solution in a specific ratio, and the polymer is used as a shell material to form a stable microcapsule wall, thereby improving the mechanical strength and chemical stability of the microcapsule; ultrasonic treatment can refine the PCM particles in the emulsion, increase the specific surface area of ​​the microcapsule, thereby optimizing the phase change performance of PCM, improving the precise control of the latent heat value and the phase change temperature range, and strengthening the adhesion of the microcapsule shell. Firmness; microencapsulated PCM has good thermal stability and safety, which can prevent leakage of PCM during phase change and improve the washability of fabrics; making them less prone to damage during processing and use, while improving the compatibility and processing performance of microcapsules in fabrics; polyvinyl alcohol and polyethylene glycol can be used as dispersants to help PCM nanoparticles disperse evenly in aqueous media, avoid particle agglomeration, and improve the stability of the material. At the same time, the polymer can also serve as a protective layer, attached to the outside of PCM, to prevent PCM from direct contact with the external environment during phase change and reduce the risk of leakage.

[0034] Furthermore, the material of the PCM nanoparticles is phase change paraffin; and the surfactant is sodium dodecyl sulfate (SDS).

[0035] Description: Phase change paraffin wax is used as the phase change material, which can absorb or release heat when the temperature changes, thus having good thermal energy storage and regulation functions. This allows the material or product to maintain a relatively stable temperature range, improving environmental adaptability and comfort.

[0036] The use of surfactant sodium dodecyl sulfate can reduce the surface tension of water, improve the wettability and dispersibility of PCM nanoparticles in aqueous solution, and thus improve the fluidity and uniformity during processing; in addition, SDS also has a certain emulsifying and stabilizing effect, which helps to maintain the stable dispersion state of PCM particles; by optimizing the ratio of PCM nanoparticles to water-soluble polymers and surfactants, the phase change temperature range and latent heat of the material can be adjusted, the thermal efficiency of the phase change process can be improved, and the material can effectively undergo phase change at a lower temperature.

[0037] Furthermore, the emulsion and the water-soluble polymer solution are subjected to post-treatment after ultrasonic treatment, and the post-treatment method is as follows: at a temperature of 30 to 40° C., 1 to 2% of a glutaraldehyde solution and 0 to 5% of N-hydroxymethyl acrylamide are added to the emulsion and the water-soluble polymer solution by weight, and stirred at a stirring speed of 50 to 200 r / min for 5 to 15 minutes; the glutaraldehyde solution is an aqueous solution with a glutaraldehyde concentration of 2.5 to 5wt%.

[0038] Description: Glutaraldehyde is a commonly used cross-linking agent, which can react with amino groups in proteins and polymers to form a stable cross-linking network. When added to the preparation of microcapsules, it can enhance the mechanical strength and chemical stability of the shell and improve the durability of the microcapsules. Through the cross-linking reaction, the PCM inside the microcapsules can be further fixed, the leakage at high temperature or during phase change can be reduced, and the thermal stability and safety of the microcapsules can be improved. The addition of N-hydroxymethyl acrylamide can change the reactivity of the compound and help modify the shell of the microcapsule, such as improving its water solubility, thermal stability and mechanical properties, making it more suitable for specific applications. The appropriate stirring speed and time can ensure the uniform dispersion of the post-treatment agent and avoid local over-concentration or over-dilution, thereby optimizing the processing performance of the microcapsules, such as improving fluidity and formability; by adjusting the addition amount of glutaraldehyde and N-hydroxymethyl acrylamide, the shell thickness and porosity of the microcapsules can be optimized, thereby improving the loading efficiency of PCM and increasing the thermal energy storage capacity of the microcapsules; the use of cross-linking agents and modifiers can improve the adaptability of microcapsules to different environmental conditions, so that they can maintain stable performance under a wider range of conditions; by adjusting the degree of cross-linking and shell structure, the control of thermal energy absorption and release can be achieved.

[0039] The beneficial effects of the present invention are as follows: the present invention can absorb or release heat through the phase change of PCM in the phase change microcapsule at a specific temperature, thereby helping the fabric to remain within a constant comfortable temperature range and providing a cool feeling; the addition of spandex components increases the elasticity of the fabric, and the distribution density of the phase change microcapsules directly affects its temperature regulation ability; controlling a sufficient number of microcapsules to cover the fabric can form an effective heat energy exchange layer between the human body and the environment, thereby achieving efficient temperature regulation; a microcapsule diameter of 1 to 10 μm can ensure that the microcapsules are evenly dispersed in the fabric, while reducing the impact on the feel and air permeability of the fabric, and a smaller diameter helps to improve the dispersion of the microcapsules in the fabric, ensuring the uniformity of the temperature regulation effect and the overall comfort of the fabric.

[0040] By baking, the phase change microcapsules are more closely combined with the fabric, thereby enhancing the washability of the microcapsules; the reshaping process can further fix the shape and size of the fabric, thereby improving the stability and durability of the fabric; through the process flow of the present application, the fabric not only has good temperature regulation performance, but also maintains high elasticity, softness and breathability, and at the same time has excellent color fastness, anti-yellowing and washability. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a bar graph of the cold sensation value test of samples of Examples 1 to 18 of the present invention and Comparative Examples 1 to 4;

[0042] Figure 2 It is a bar graph of the test of the number of times the samples of Examples 1 to 18 of the present invention and Comparative Examples 1 to 4 are washed with water. DETAILED DESCRIPTION

[0043] In order to further illustrate the method adopted by the present invention and the effect achieved, the technical solution of the present invention will be clearly and completely described in combination with experiments below.

[0044] Example 1: A washable microcapsule PCM constant temperature cool fabric, comprising, by mass percentage, a grey fabric made of 12.5% ​​spandex and the remainder nylon weft knitted, a print coated on the surface of the grey fabric, and phase change microcapsules arranged on the surface of the grey fabric; the average distribution density of the phase change microcapsules is 32.5 g / m 2 , the average diameter of the phase change microcapsules is 5 μm;

[0045] The method for preparing the fabric comprises the following steps:

[0046] S1. Weaving grey fabric

[0047] The spandex and nylon are introduced into a knitting machine according to a formula ratio for weft knitting to obtain a grey fabric; the weft knitting density is 40 needles / inch;

[0048] S2, pre-setting and anti-yellowing pre-treatment

[0049] The grey cloth is placed in a width-opening machine for pre-setting, the pre-setting time is 3.5 minutes, and an anti-yellowing agent a is added during the pre-setting process to obtain a pre-treated fabric; the temperature of the width-opening machine is 195° C., and the feeding speed is 25 m / min; the anti-yellowing agent a is a mixture of anti-yellowing powder and water, and the concentration of the anti-yellowing powder is 250 g / L; the anti-yellowing powder is HN-150 anti-yellowing powder;

[0050] S3, dyeing and finishing

[0051] The pretreated fabric is subjected to acid dyeing and finishing at a temperature of 95° C. for 17.5 minutes, and then cooled to 65° C. and kept warm for 20 minutes to obtain a dyed fabric; the dye used in the acid dyeing and finishing is a mixed solution of a dye and an anti-yellowing agent b, and the mass ratio of the two is 1:4; the anti-yellowing agent b is an anti-yellowing agent 0328; the pH value of the acid dyeing and finishing dye is 3;

[0052] S4, drying process

[0053] Drying the dyed cloth at a temperature of 160° C. to obtain a dried dyed cloth, wherein the feed speed of the dryer is 30 m / min and the drying time is 1.5 min;

[0054] S5, Printing Process

[0055] The printing paste with phase change microcapsules is prepared, introduced into a magnetic rod printing machine, and then the dried dyed cloth is printed to obtain a printed cloth; then the printed cloth is baked to obtain a baked printed cloth, the baking temperature is 110°C, the baking time is 2.5 minutes, and the baking process is thermal stability baking, that is, the material is heated under certain temperature and time conditions to improve the thermal stability of the printed cloth; the mesh size of the round screen in the magnetic rod printing machine is 105 meshes, and the magnetic rod pressure is 3 5Pa, the feeding speed of the magnetic rod printing machine is 30m / min; in terms of mass percentage, the printing paste is composed of 32.5% of a cross-linking agent, 37.5% of a phase change microcapsule, 2.5% of a thickener, 0.2% of a curing agent, 0.2% of a hydrophilic agent, 1.5% of an auxiliary agent and the remainder of a pigment solution; the auxiliary agent is a preservative and an adhesive, which are added in a mass ratio of 1:2; the solvent of the pigment solution is water; the pigment solution, cross-linking agent, thickener, curing agent, hydrophilic agent, preservative and adhesive are all commercially available products;

[0056] The cross-linking agent is SCJ-937, the thickener is HIT, the adhesive is AH-101 printing adhesive, the curing agent is SCJ-937 fixative, and the hydrophilic agent is hydrophilic softener. S-69;

[0057] The preparation method of the phase change microcapsule is as follows: dispersing PCM nanoparticles in water to form a stable emulsion, adding a surfactant accounting for 4% of the total mass of the emulsion; mixing the emulsion and the water-soluble polymer solution at a mass ratio of 1:7.5, and then performing ultrasonic treatment for 20 minutes; removing and washing the microcapsules by filtering, and obtaining the phase change microcapsules after drying;

[0058] The material of the PCM nanoparticles is phase-change paraffin; the water-soluble polymer solution is polyvinyl alcohol; the surfactant is sodium dodecyl sulfate SDS;

[0059] The emulsion and the water-soluble polymer solution are further subjected to post-treatment after ultrasonic treatment, and the post-treatment method is as follows: at a temperature of 35° C., 1.5% of a glutaraldehyde solution and 2.5% of N-hydroxymethyl acrylamide are added to the total mass of the emulsion and the water-soluble polymer solution, and stirred at a stirring speed of 125 r / min for 10 minutes; the glutaraldehyde solution is an aqueous solution with a glutaraldehyde concentration of 3.75wt%;

[0060] S6. Reshaping

[0061] The baked printed fabric was shaped at 150° C. for 2.5 minutes at a shaping speed of 19 m / min to obtain a washable microcapsule PCM fabric.

[0062] Embodiment 2: This embodiment is basically the same as embodiment 1, except that the grey cloth is only knitted with nylon weft.

[0063] Embodiment 3: This embodiment is substantially the same as Embodiment 1, except that it comprises a grey fabric knitted with 25% spandex and the remainder nylon.

[0064] Example 4: This example is basically the same as Example 1, except that the average distribution density of the phase change microcapsules is 15 g / m 2 , the average diameter of the phase change microcapsules is 1 μm.

[0065] Example 5: This example is basically the same as Example 1, except that the average distribution density of the phase change microcapsules is 50 g / m 2 , the average diameter of the phase change microcapsules is 10 μm.

[0066] Example 6: This example is basically the same as Example 1, except that the presetting time is 2 minutes, the temperature of the opening machine is 190°C, and the feed speed is 20 m / min; the anti-yellowing agent a is a mixture of anti-yellowing powder and water, and its concentration is 200 g / L;

[0067] The pretreated fabric is subjected to acid dyeing at 90°C for 5 minutes, then cooled to 50°C and kept warm for 15 minutes to obtain a dyed cloth; the dye used in the acid dyeing is a mixture of a dye and an anti-yellowing agent b, and the mass ratio of the two is 1:3.

[0068] Example 7: This example is basically the same as Example 1, except that the presetting time is 5 minutes, the temperature of the opening machine is 200°C, and the feed speed is 30 m / min; the anti-yellowing agent a is a mixture of anti-yellowing powder and water, and its concentration is 300 g / L;

[0069] The pretreated fabric is subjected to acid dyeing and finishing at a temperature of 100° C. for 30 minutes, and then cooled to 80° C. and kept warm for 25 minutes to obtain a dyed cloth; the dye used in the acid dyeing and finishing is a mixture of a dye and an anti-yellowing agent B, and the mass ratio of the two is 1:5.

[0070] Example 8: This example is basically the same as Example 1, except that the dyed cloth is dried at a temperature of 150°C to obtain the dried dyed cloth, the feed speed of the dryer is 25m / min, and the drying time is 1min.

[0071] Example 9: This example is basically the same as Example 1, except that the dyed cloth is dried at a temperature of 170°C to obtain the dried dyed cloth, the feed speed of the dryer is 35m / min, and the drying time is 2min.

[0072] Example 10: This example is basically the same as Example 1, except that the baking temperature is 100°C and the baking time is 2 minutes; the mesh of the round screen in the magnetic rod printing machine is 100 mesh, the magnetic rod pressure is 30Pa, and the feed speed of the magnetic rod printing machine is 25m / min; in terms of mass percentage, the printing paste is composed of 30% cross-linking agent, 30% phase change microcapsules, 2% thickener, 0.1% curing agent, 0.1% hydrophilic agent, 1% auxiliary agent and the remainder pigment solution.

[0073] Example 11: This example is basically the same as Example 1, except that the baking temperature is 120°C, and the baking time is 3 minutes; the mesh of the round screen in the magnetic rod printing machine is 110 mesh, the magnetic rod pressure is 40Pa, and the feed speed of the magnetic rod printing machine is 35m / min; in terms of mass percentage, the printing paste is composed of 35% cross-linking agent, 45% phase change microcapsules, 3% thickener, 0.3% curing agent, 0.3% hydrophilic agent, 2% auxiliary agent and the remainder pigment solution.

[0074] Example 12: This example is basically the same as Example 1, except that the baked printed cloth is shaped at a temperature of 140° C. for 2 minutes at a shaping speed of 18 m / min to obtain a washable microcapsule PCM fabric.

[0075] Example 13: This example is basically the same as Example 1, except that the baked printed cloth is shaped at a temperature of 160° C. for 3 minutes at a shaping speed of 20 m / min to obtain a washable microcapsule PCM fabric.

[0076] Example 14: This example is basically the same as Example 1, except that the preparation method of the phase change microcapsules is as follows: PCM nanoparticles are dispersed in water to form a stable emulsion, and then a surfactant accounting for 0.1% of the total mass of the emulsion is added; the emulsion and the water-soluble polymer solution are mixed in a mass ratio of 1:5, and then ultrasonic treatment is performed for 10 minutes.

[0077] Example 15: This example is basically the same as Example 1, except that the preparation method of the phase change microcapsules is as follows: PCM nanoparticles are dispersed in water to form a stable emulsion, and then a surfactant accounting for 8% of the total mass of the emulsion is added; the emulsion and the water-soluble polymer solution are mixed evenly in a mass ratio of 1:10, and then ultrasonic treatment is performed for 30 minutes.

[0078] Example 16: This example is basically the same as Example 1, except that the post-treatment method is: at a temperature of 30°C, add a glutaraldehyde solution accounting for 1% of the total mass of the emulsion and the water-soluble polymer solution, and stir at a stirring speed of 50 r / min for 5 minutes; the glutaraldehyde solution is an aqueous solution with a glutaraldehyde concentration of 2.5wt%.

[0079] Example 17: This example is basically the same as Example 1, except that the post-treatment method is: at a temperature of 40°C, add 2% glutaraldehyde solution and 5% N-hydroxymethyl acrylamide to the total mass of the emulsion and the water-soluble polymer solution, and stir at a stirring speed of 200 r / min for 15 minutes; the glutaraldehyde solution is an aqueous solution with a glutaraldehyde concentration of 5wt%.

[0080] Example 18: This example is basically the same as Example 1, except that the pH value of the acid dyeing and finishing dye is 5.

[0081] Control Example 1: With reference to Example 1, the phase change microcapsules used the 28-degree phase change material microcapsule cooling aid produced by Hefei Xinneng Phase Change New Material Technology Co., Ltd.; the average particle size of the microcapsules was 3 μm, and no post-processing was performed.

[0082] Comparative Example 2: Example 1 was used as a reference without post-processing.

[0083] Control Example 3: With reference to Example 1, the post-treatment method is as follows: at a temperature of 28°C, 3% glutaraldehyde solution and 9% N-hydroxymethyl acrylamide are added to the total mass of the emulsion and the water-soluble polymer solution, and stirred at a stirring speed of 40 r / min for 4 minutes; the glutaraldehyde solution is an aqueous solution with a glutaraldehyde concentration of 2wt%.

[0084] Control Example 4: Taking Example 1 as a reference, the printing paste is composed of 25% of a cross-linking agent, 28% of phase change microcapsules, 1% of a thickener, 0.4% of a curing agent, 0.4% of a hydrophilic agent, 0.5% of an auxiliary agent and the remainder of a pigment solution.

[0085] In order to explore the performance of the fabrics manufactured in Examples 1 to 18 and Comparative Examples 1 to 4, the main materials were determined according to the experimental formula and 22 groups of samples were obtained for testing. Figure 1 , 2 The experimental results are as follows:

[0086] in, Figure 2 Condition 1 in the example is that when the coldness value of the sample test drops below 0.4, the water washing test is stopped and the number of washes is counted;

[0087] 1. Explore the influence of fabric ratio on the performance of fabric samples:

[0088] like Figure 1 , 2As shown, by comparing Examples 1 to 3, it can be seen that Example 3 has a better temperature regulating effect, and Example 1 has the best water wash resistance; changing the ratio parameters of spandex and nylon will have a certain impact on the prepared fabric samples, among which the fabric samples prepared using the process parameter values ​​of Example 1 have the best comprehensive performance.

[0089] like Figure 1 , 2 As shown, by comparing Examples 1, 4, and 5, it can be seen that: it can be seen that Example 1 has the best comprehensive performance; the temperature regulating effect and water washing resistance of Example 5 are better than those of Example 4. Changing the process parameters for fabric preparation will have a certain impact on the sample performance, among which the fabric samples prepared with process parameter values ​​closer to Example 1 have the best comprehensive performance.

[0090] 2. Explore the influence of fabric preparation process parameters on fabric sample performance:

[0091] like Figure 1 , 2 As shown, by comparing Examples 1, 6, and 7, it can be seen that: it can be seen that Example 1 has the best comprehensive performance; the temperature regulating effect and water washability effect of Example 7 are better than those of Example 6. Changing the process parameters for fabric preparation will have a certain impact on the sample performance, among which the fabric sample prepared using the process parameter values ​​of Example 1 has the best comprehensive performance.

[0092] like Figure 1 , 2 As shown, by comparing Example 1 and Control Example 1, it can be seen that the comprehensive performance of Example 1 is significantly better than that of Control Example 1, and the fabric prepared by this method can have better temperature regulating effect and water washability after subsequent processing.

[0093] 3. Explore the impact of post-processing technology on the performance of fabric samples:

[0094] like Figure 1 , 2 As shown, by comparing Examples 1, 16, and 17, it can be seen that the comprehensive performance of the fabric sample prepared according to the method of Example 1 is the best, and the comprehensive performance of Example 17 is better than that of Example 16. It can be seen that the process parameters of the post-processing can have a certain influence on the performance of the fabric sample, and controlling the appropriate ratio can improve its temperature regulating effect and water washability.

[0095] From the comparison between Example 1 and Control Examples 2 and 3, it can be seen that the temperature adjustment effect of Example 1 is significantly better than that of Control Examples 2 and 3, and the post-processing operation and the change of its process parameter range have a more obvious effect on the fabric sample. The comprehensive performance of the fabric prepared and treated within the parameter range of this scheme is better.

[0096] 4. Explore the influence of printing process parameters on the performance of fabric samples:

[0097] like Figure 1 , 2 As shown, by comparing Examples 1, 10, and 11, it can be seen that Example 11 has the best temperature adjustment effect, and there is no obvious difference in the water wash resistance of the fabric samples treated according to the three examples. It can be seen that the process parameters of the printing paste have a certain influence on the performance of the fabric samples, but the effect is not obvious, and the method parameters used in Example 1 are the best.

[0098] Compared with Example 1 and Control Example 4, the temperature regulating effect of Control Example 4 is weakened to a certain extent, and there is no difference in water washing resistance. It can be seen that the change in the ratio parameter range of the printing paste has a greater impact on the temperature regulating performance of the fabric.

[0099] 5. Explore the impact of changes in other process parameters on the performance of fabric samples:

[0100] like Figure 1 , 2 As shown, by comparing Example 1 with Examples 8 and 9, it can be seen that the change of the process parameters for drying the dyed cloth has little effect on the temperature regulating effect and water washing resistance of the fabric, and the temperature regulating effect and water washing resistance of the fabric processed by the drying process parameters of Example 1 are better;

[0101] like Figure 1 , 2 As shown, by comparing Example 1 with Examples 12 and 13, it can be seen that the change in the process parameters for reshaping the baked printed fabric has a certain influence on the temperature regulating effect and water washing resistance of the fabric, and the performance of Example 12 is the worst, among which the temperature regulating effect and water washing resistance of the fabric treated by the method of Example 1 are better;

[0102] like Figure 1 , 2 As shown, by comparing Example 1 with Examples 14 and 15, it can be seen that: the change of the process parameters for preparing the phase change microcapsules has a certain influence on the temperature regulating effect of the fabric, the cold sensation values ​​of Examples 14 and 15 are significantly lower than that of Example 1, and the performance of Example 14 is the worst; the change of the process parameters for preparing the phase change microcapsules has no obvious effect on the water washing resistance, and the temperature regulating effect and water washing resistance of the fabric treated by the method of Example 1 are the best;

[0103] like Figure 1 , 2 As shown, by comparing Example 1 with Examples 16 and 17, it can be seen that the post-treatment of the emulsion and the water-soluble polymer solution after ultrasonic treatment has no obvious effect on the temperature regulating effect and water washability of the fabric due to the change in process parameters. Example 16 has the worst performance, and the fabric treated by the method of Example 1 has the best temperature regulating effect and water washability.

Claims

1. A washable microcapsule PCM constant temperature cool fabric, characterized in that: The invention is composed of a grey fabric knitted with 0-25% spandex and the rest nylon by mass percentage, a printing coated on the surface of the grey fabric, and phase change microcapsules arranged on the surface of the grey fabric; the average distribution density of the phase change microcapsules is 15-50g / m 2 The average diameter of the phase change microcapsules is 1 to 10 μm.

2. The method for preparing a washable microcapsule PCM constant temperature cool fabric according to claim 1, characterized in that: The following steps are involved: S1. Weaving grey fabric The spandex and nylon are introduced into a knitting machine according to a formula ratio for weft knitting to obtain a grey fabric; S2, pre-setting and anti-yellowing pre-treatment The grey fabric is placed in a width-opening machine for pre-setting, the pre-setting time is 2 to 5 minutes, and an anti-yellowing agent a is added during the pre-setting process to obtain a pre-treated fabric; The temperature of the opening machine is 190-200°C, and the feeding speed is 20-30m / min; S3, dyeing and finishing The pretreated fabric is subjected to acid dyeing and finishing at a temperature of 90 to 100° C. for 5 to 30 minutes, and then the temperature is reduced to 50 to 80° C. and kept at this temperature for 15 to 25 minutes to obtain a dyed fabric; S4. Drying Drying the dyed cloth at a temperature of 150 to 170° C. to obtain a dried dyed cloth, wherein the feed speed of the dryer is 25 to 35 m / min and the drying time is 1 to 2 min; S5, Printing Processing Prepare a printing paste with phase change microcapsules, introduce it into a magnetic rod printing machine, and then print the dried dyed cloth to obtain a printed cloth; then bake the printed cloth to obtain a baked printed cloth, the baking temperature is 100-120° C., and the baking time is 2-3 minutes; S6. Reshaping The baked printed fabric is shaped at a temperature of 140-160° C. for 2-3 minutes at a shaping speed of 18-20 m / min to obtain a washable microcapsule PCM fabric.

3. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 2, characterized in that: The weft knitting described in S1 has a weaving density of 30 to 50 needles / inch.

4. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 2, characterized in that: The anti-yellowing agent a in S2 is a mixture of anti-yellowing powder and water, and the concentration of the anti-yellowing powder is 200-300 g / L; the anti-yellowing powder is HN-150 anti-yellowing powder.

5. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 2, characterized in that: The dye used in the acid dyeing and finishing described in S3 is a mixture of a dye and an anti-yellowing agent b, and the mass ratio of the two is 1:3-5; the anti-yellowing agent b is anti-yellowing agent 0328.

6. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 2, characterized in that: The mesh size of the round screen in the magnetic bar printing machine in S5 is 100-110 meshes, the pressure of the magnetic bar is 30-40 Pa, and the feeding speed of the magnetic bar printing machine is 25-35 m / min.

7. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 2, characterized in that: Measured by mass percentage, the printing paste in S5 is composed of 30-35% of a cross-linking agent, 30-45% of phase change microcapsules, 2-3% of a thickener, 0.1-0.3% of a curing agent, 0.1-0.3% of a hydrophilic agent, 1-2% of an auxiliary agent and the remainder of a pigment solution; the auxiliary agent is a combination of one or more of a preservative, a defoaming agent and a binder.

8. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 2, characterized in that: The preparation method of the phase change microcapsules described in S5 is: disperse PCM nanoparticles in water to form a stable emulsion, then add a surfactant accounting for 0.1 to 8% of the total mass of the emulsion; mix the emulsion and the water-soluble polymer solution at a mass ratio of 1:5 to 10, and then perform ultrasonic treatment for 10 to 30 minutes; remove and wash the microcapsules by centrifugation or filtration, and obtain phase change microcapsules after drying; the water-soluble polymer solution is one of polyvinyl alcohol and polyethylene glycol, or a combination of two.

9. The washable microcapsule PCM constant temperature cool fabric and preparation method thereof according to claim 7, characterized in that: The material of the PCM nanoparticles is phase-change paraffin; the surfactant is sodium dodecyl sulfate (SDS).

10. The method for preparing the washable microcapsule PCM constant temperature cool fabric according to claim 8, characterized in that: The emulsion and the water-soluble polymer solution are further subjected to post-treatment after ultrasonic treatment. The post-treatment method is as follows: at a temperature of 30 to 40° C., 1 to 2% of a glutaraldehyde solution and 0 to 5% of N-hydroxymethyl acrylamide are added to the total mass of the emulsion and the water-soluble polymer solution, and stirred at a stirring speed of 50 to 200 r / min for 5 to 15 minutes; the glutaraldehyde solution is an aqueous solution with a glutaraldehyde concentration of 2.5 to 5wt%.

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