Preparation method of flexible phase change cold storage sterilization fabric and fabric prepared by the method

Abstract

The present application relates to the technical field of textile, especially to a preparation method of a flexible phase change cold storage sterilization fabric and the fabric prepared by the method, the present application combines phase change material paraffin, nano titanium dioxide and flexible material to prepare initial state raw material, then the initial state raw material is treated by a pre-spinning preparation process, stretched after being made into nascent fiber by using a dry jet wet spinning method, heat set, beaming, yarn sizing, doubling, lease, harnessing and reed process, and finally woven into the flexible phase change cold storage sterilization fabric, the fabric has the characteristics of porous and breathable, and realizes the benefits of heat preservation and sterilization, and compared with the general wet spinning method, the spinning speed of the new dry jet wet spinning method is several times higher than that of the latter, a spinneret with larger aperture can be used, and a spinning solution with higher concentration and larger viscosity can be used, which significantly and effectively improves the production capacity of the spinning machine.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a method for preparing a flexible phase change cold storage sterilization fabric and the fabric prepared therefrom. Background Technology

[0002] Fabrics are widely used in modern society, covering areas such as protection, warmth, and isolation, each with different functions. With societal development, the function of fabrics is no longer limited to providing a single function but is evolving towards comprehensive functionality. For example, while current protective gear such as masks can block droplets, they cannot eliminate the bacteria or viruses within them. The number of contaminants trapped on the mask surface increases with prolonged wear. These contaminants, combined with exhaled water vapor, easily promote bacterial growth on the mask surface, affecting its filtration efficiency and potentially causing secondary pollution. This also increases the risk of infection from direct skin contact with these contaminants. Furthermore, there is an urgent need for more efficient and cost-effective sterilization methods for food storage and packaging. Food spoilage is primarily caused by bacteria and mold. To kill bacteria and mold, the refrigerator industry uses ozone generators. Ozone is a highly effective bactericide that can kill bacteria on food inside the refrigerator; however, high concentrations are harmful to humans, and the strong odor of ozone makes it uncomfortable to use and unacceptable to users. Temperature is also an important factor affecting bacterial activity and closely affects human comfort. Workers who wear masks, protective clothing and other equipment for long periods of time will feel stuffy and hot in summer, and even in spring and autumn. On the one hand, the stuffiness and discomfort in summer affect people's comfort and work efficiency; on the other hand, the stuffiness caused by the use of protective equipment, as well as the water vapor and sweat produced, can easily breed bacteria. For food storage and packaging, high temperatures greatly enhance the activity of bacteria and mold, which is also a problem. Therefore, protective equipment and food packaging have high requirements for cooling and heat insulation functions.

[0003] Chinese Patent Publication No. CN115478349A discloses a nanofiber composite fabric and its preparation process. The fabric includes a base layer, which is knitted from 55-5D warp yarns and 55-65D weft yarns. The warp yarns are made of cotton yarn containing nano-silver particles, Tencel fiber, and bamboo fiber blend. This invention adds antibacterial fibers to the fabric to give it a good antibacterial effect, and the antibacterial effect is made more durable and efficient through the impregnation of antibacterial agents. However, the above technical solution has the following problems: the antibacterial agent impregnation gradually washes away with the use of the fabric, resulting in the fabric's antibacterial effect not being sustainable. In addition, antibacterial agents generally have a special odor, which limits the application scenarios. Summary of the Invention

[0004] Therefore, the present invention provides a flexible phase change cold storage sterilization fabric and its preparation method to overcome the problem that the antibacterial effect of antibacterial fabrics impregnated with antibacterial agents is not sustained in the prior art.

[0005] To achieve the above objectives, in one aspect, the present invention provides a method for preparing a flexible phase change cold-storage sterilization fabric, comprising: Step S1: Prepare initial raw materials. Adsorb molten paraffin with a flexible material and add nano-titanium dioxide for stirring and fusion. After fusion, solidify to form a flexible phase change raw material. Then, statically mix the solution after filtering the flexible phase change raw material to prepare the initial flexible phase change raw material. Step S2: Prepare nascent fibers. After the flexible phase change nascent raw material is processed by the pre-spinning preparation process, it is fed into the spinning machine. The flexible phase change nascent raw material is extruded from the spinneret by the dry-jet wet spinning method. After passing through the air layer, it enters the coagulation bath. After the material cools and solidifies, it is discharged from the coagulation bath to make nascent fibers. Step S3: Prepare secondary fibers by stretching the nascent fibers on a stretching and twisting machine to form secondary fibers. Determine whether the secondary fibers meet the stretching standards based on their breaking strength and elongation at break. Step S4: Heat set the secondary fibers that meet the stretching standard to form semi-fibers, and test the heat setting effect of the semi-fibers. Determine whether the semi-fibers meet the heat setting standard based on the heat setting effect test results. Step S5: Under the first qualified condition, the semi-fiber is woven into a flexible phase change cold storage sterilization fabric after undergoing warping, sizing, beam bonding, splitting, heddle threading and reed raising processes. Step S6: Detect the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric to determine the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric. If the uniformity exceeds the limit, determine the adjustment method of the preparation process parameters in step S1 based on the fiber preparation uniformity. The first qualification condition is that the semi-fiber meets the heat setting standard. The heat setting effect test is to test the heat shrinkage rate of the semi-fiber. The uniformity exceeding the limit condition is that the tested fiber preparation uniformity does not meet the standard. The preparation parameters in step S1 include oil bath temperature, stirring speed and stirring time.

[0006] Furthermore, in step S1, the specific steps for preparing the flexible phase change initial state raw material include: Step S11: Melt paraffin wax. Place the phase change material paraffin wax into a heat-collecting constant temperature magnetic stirrer set at a set temperature and heat until completely melted. Step S12: Flexible material adsorbs paraffin wax. A flexible material is added to the molten paraffin wax. The oil bath temperature, stirring speed, and stirring time under constant temperature and speed are set during the mixing process. The flexible material's polymer swelling effect in the paraffin wax solvent is used to adsorb the paraffin wax. Step S13: Integrate titanium dioxide by adding a first set amount of nano-titanium dioxide to the mixture of phase change material and flexible material in the stirrer, and setting the oil bath temperature, stirring speed and stirring time under constant temperature and speed during the mixing process, so as to solidify at room temperature to form the flexible phase change raw material. Step S14: The flexible phase change raw material is placed in a screw extruder, heated and melted into a flexible phase change raw material melt, and then extruded and fed into a filter to filter out mechanical impurities and incompletely melted solid material particles. Step S15: Using a mixer installed in the melt delivery pipe at the output end of the filter, the filtered melt is statically mixed to reduce stratification caused by the high viscosity melt, thus preparing the flexible phase change initial state raw material. The set temperature is 10°C to 20°C higher than the melting point of paraffin, and the flexible material includes POE, SEBS or SBS. The first set amount is the initial amount of nano-titanium dioxide added and is set to the minimum amount within the range of nano-titanium dioxide addition. In step S13, the parameters of the mixing process include the initial value of the oil bath temperature, the initial value of the stirring speed, and the constant temperature and constant speed stirring time.

[0007] Further, in step S3, the tensile effect of the secondary fiber is detected to obtain the breaking strength and breaking elongation of the secondary fiber. Based on the comparison results of the breaking strength of the secondary fiber with the preset breaking strength range and the comparison results of the breaking elongation of the secondary fiber with the preset breaking elongation range, it is determined whether the secondary fiber meets the tensile standard. If the tensile strength of the secondary fiber is not less than the minimum value of the preset tensile strength range, and the elongation at break of the secondary fiber is not less than the minimum value of the preset elongation at break range, the secondary fiber is determined to meet the tensile standard, and no parameter adjustment is required in the preparation process. If either the breaking strength or the breaking elongation of the secondary fiber is less than a preset value, the secondary fiber is deemed not to meet the tensile standard, and the titanium dioxide content in the flexible phase change cold storage sterilization raw material is deemed not to meet the standard, and the titanium dioxide content needs to be adjusted.

[0008] Further, in step S3, when the secondary fiber does not meet the tensile standard, the method for adjusting the titanium dioxide content in the preparation process is determined based on the comparison results of the secondary fiber's breaking strength and elongation at break with preset indicators. If the breaking strength and breaking elongation of the secondary fiber are both less than the preset index, it is determined that the content of nano titanium dioxide in the secondary fiber is excessive, and the first adjustment method is adopted to reduce the amount of nano titanium dioxide. If the breaking strength of the secondary fiber is less than the preset breaking strength and the breaking elongation is not less than the preset breaking elongation, it is determined that the content of nano titanium dioxide in the secondary fiber is insufficient, and the amount of nano titanium dioxide is increased by the second adjustment method. If the tensile strength of the secondary fiber is not less than the preset tensile strength and the tensile elongation is less than the preset tensile elongation, it is determined that the content of nano-titanium dioxide in the secondary fiber is excessive, and the amount of nano-titanium dioxide is reduced by the third adjustment method. In the first adjustment method, the reduction amount Δm1 of nano-titanium dioxide is determined by equation (1): Δm1=α×m0 (1) Where m0 is the amount of titanium dioxide added before adjustment, and 0 < α < 0.5; In the second adjustment method, the increase in nano-titanium dioxide Δm2 is determined by equation (2): Δm2=β×m0 (2) Where 0 < β < 0.5; The reduction amount Δm3 of nano-titanium dioxide in the third adjustment method is determined by equation (3): Δm3=γ×m0 (3) Where 0 < γ < α < 0.5.

[0009] Further, in step S4, the heat setting effect of the semi-fiber is tested to obtain the heat shrinkage rate of the semi-fiber, and the semi-fiber is judged to meet the heat setting standard based on the comparison result of the heat shrinkage rate of the semi-fiber and the preset heat shrinkage rate. If the heat shrinkage rate of the semi-fiber is not greater than the preset heat shrinkage rate, it is determined that the thermal stability of the semi-fiber meets the heat setting standard, and no parameter adjustment is required in the heat setting process. If the heat shrinkage rate of the semi-fiber is greater than the preset heat shrinkage rate, it is determined that the thermal stability of the semi-fiber does not meet the heat setting standard, and the parameters of the heat setting process need to be adjusted. The parameter adjustment includes adjusting the setting temperature and / or setting time in step S4.

[0010] Furthermore, in step S4, during the heat setting effect test of the semi-fibers, when the heat shrinkage rate of the semi-fibers does not meet the heat setting standard, the specific parameter adjustment steps for the heat setting process include: Step S41: Increase the setting temperature during the heat setting process; Step S42: Under the first adjustment limit condition, adjust the setting temperature during the heat setting process to the highest value within the setting temperature range, and increase the setting time during the heat setting process; The first adjustment exceeding the limit condition is that the heat setting temperature during the heat setting process has been adjusted to the highest value within the heat setting temperature range and the thermal stability of the semi-fiber does not meet the heat setting standard.

[0011] Further, in step S6, the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is detected, the nano-titanium dioxide content of the flexible phase change cold storage sterilization fabric in several unit areas is measured to calculate the standard deviation of each nano-titanium dioxide content detection value, and the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric is determined by comparing the standard deviation with the preset standard deviation of the titanium dioxide content. If the standard deviation is not less than the preset standard deviation, it is determined that the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is reasonable and the fiber preparation uniformity of the fabric meets the standard, so there is no need to adjust the preparation process parameters. If the standard deviation is less than the preset standard deviation, it is determined that the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is unreasonable and the fiber preparation uniformity of the fabric does not meet the standard. The preparation parameters in step S13 of the preparation process need to be adjusted. The preparation parameters in step S13 include oil bath temperature, stirring speed, and stirring time.

[0012] Further, in step S6, under the condition of excessive uniformity, the parameter adjustment steps for unreasonable distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric include: Step S61: Increase the stirring speed and lengthen the stirring time in step S13 according to the fiber preparation uniformity. Step S62: If the first adjustment method fails, increase the oil bath temperature in step S13; The failure of the first adjustment method occurs when the preparation parameters in step S61 have been adjusted to the corresponding threshold and the fabric uniformity is determined to be non-compliant with the standard.

[0013] On the other hand, the present invention also provides a flexible phase change cold storage sterilization fabric prepared by the above preparation method. The fabric is composed of phase change material paraffin, nano titanium dioxide and flexible material. The phase change material paraffin is a high-quality white organic solid-liquid phase change material, the nano titanium dioxide is a nano-scale powder, and the flexible material is a flexible shaping material composed of polymers, including POE, SEBS and SBS.

[0014] Furthermore, the mass ratio of the phase change material paraffin to the flexible material is 4:1, and the phase change temperature of the phase change material paraffin is between 20-28°C.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a flexible material to adsorb molten paraffin wax, mixes it with a certain proportion of nano-titanium dioxide, and then solidifies it into a flexible phase change raw material. The flexible phase change raw material is then spun into a porous fiber fabric using a novel dry-jet wet spinning process. This fabric has good air permeability, is strong and durable, and is suitable for practical applications. The textile process technology is mature and low in cost. Furthermore, compared with the general wet spinning method, the spinning speed of the novel dry-jet wet spinning method is several times higher. It can also use a spinneret with a larger aperture and a spinning solution with a higher concentration and viscosity, which significantly and effectively improves the production capacity of the spinning machine.

[0016] Furthermore, the phase change material paraffin plays a role in heat preservation. Compared with inorganic phase change materials, organic phase change materials have significantly reduced supercooling and phase separation, resulting in better thermal cycling performance, non-corrosiveness, high reliability, high latent heat, easy availability, non-toxicity, and low price, making them more suitable for practical applications. The flexible material exhibits good flexibility at room temperature and has advantages such as high temperature resistance, pressure resistance, tensile strength, and folding resistance. The nano-titanium dioxide is an antibacterial agent that permanently maintains its antibacterial effect. Nano-titanium dioxide is safe and non-toxic to the human body, non-irritating to the skin, and has high safety. It can even be used as a food additive, and has no odor or strange taste. It is washable, has good thermal stability, and a long shelf life. Nano-titanium dioxide also has a sun protection effect and can play a role in sun protection when used in masks or protective clothing. Moreover, the addition of nano-titanium dioxide to fabrics can improve the tensile strength of the fabric to a certain extent.

[0017] Furthermore, this invention combines the phase change material paraffin with a flexible material, making the fabric soft and durable. This solves both the sterilization problem of protective equipment or food packaging and the problem of high temperatures promoting the growth of bacteria and mold. In addition, paraffin, flexible materials and nano titanium dioxide are all white, making them more widely used as fabrics in practice.

[0018] Furthermore, the tensile effect of the secondary fiber described in this invention is tested to obtain the breaking strength and elongation at break of the secondary fiber. Based on the comparison results of the breaking strength of the secondary fiber with the preset breaking strength range and the comparison results of the elongation at break of the secondary fiber with the preset elongation at break range, it is determined whether the secondary fiber meets the tensile standard. In this way, the amount of nano-titanium dioxide added during the preparation process is adjusted in a timely manner to reduce unnecessary rework, provide quality assurance for the tensile strength of the fabric, and enhance the durability of the fabric.

[0019] Furthermore, the present invention performs heat setting effect testing on the semi-finished fiber to obtain the heat shrinkage rate of the semi-finished fiber. Based on the comparison result between the heat shrinkage rate of the semi-finished fiber and the preset heat shrinkage rate, it is determined whether the semi-finished fiber meets the heat setting standard. For problems that do not meet the heat setting standard, a parameter adjustment plan is formulated to adjust the parameters involved in the heat setting operation in a timely manner, reduce unnecessary rework, improve the setting effect of the fabric, and improve the dimensional stability, shrinkage rate, fabric elasticity, and hand feel of the fabric, thereby meeting the requirements of textile processing and use.

[0020] Furthermore, this invention detects the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric, measures the nano-titanium dioxide content of the flexible phase change cold storage sterilization fabric in several unit areas to calculate the standard deviation of each nano-titanium dioxide content detection value, and compares the standard deviation with the standard deviation of the preset titanium dioxide content to determine the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric, and formulates a parameter adjustment scheme for the non-uniformity problem to improve the uniformity of the nano-titanium dioxide distribution in the fabric, thereby improving the overall sterilization and sun protection effect of the fabric. Attached Figure Description

[0021] Figure 1 This is a schematic flowchart of the preparation method of the flexible phase change cold storage sterilization fabric of the present invention; Figure 2 The test graphs show the breaking strength and breaking elongation of the secondary fibers prepared in Example 1. Figure 3 The image shows the DSC test results of the flexible phase change cold storage sterilization fabric prepared in Example 1. Detailed Implementation

[0022] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0025] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Please see Figure 1 The diagram shown is a flowchart illustrating the preparation method of the flexible phase change cold storage sterilization fabric of the present invention. The present invention provides a method for preparing a flexible phase change cold storage sterilization fabric, comprising: Step S1: Prepare initial raw materials. Adsorb molten paraffin with a flexible material and add nano-titanium dioxide for stirring and fusion. After fusion, solidify to form a flexible phase change raw material. Then, statically mix the solution after filtering the flexible phase change raw material to prepare the initial flexible phase change raw material. Step S2: Prepare nascent fibers. After the flexible phase change nascent raw material is processed by the pre-spinning preparation process, it is fed into the spinning machine. The flexible phase change nascent raw material is extruded from the spinneret by the dry-jet wet spinning method. After passing through the air layer, it enters the coagulation bath. After the material cools and solidifies, it is discharged from the coagulation bath to make nascent fibers. Step S3: Prepare secondary fibers by stretching the nascent fibers on a stretching and twisting machine to form secondary fibers. Determine whether the secondary fibers meet the stretching standards based on their breaking strength and elongation at break. Step S4: Heat set the secondary fibers that meet the stretching standard to form semi-fibers, and test the heat setting effect of the semi-fibers. Determine whether the semi-fibers meet the heat setting standard based on the heat setting effect test results. Step S5: Under the first qualified condition, the semi-fiber is woven into a flexible phase change cold storage sterilization fabric after undergoing warping, sizing, beam bonding, splitting, heddle threading and reed raising processes. Step S6: Detect the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric to determine the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric. If the uniformity exceeds the limit, determine the adjustment method of the preparation process parameters in step S1 based on the fiber preparation uniformity. The first qualification condition is that the semi-fiber meets the heat setting standard. The heat setting effect test is to test the heat shrinkage rate of the semi-fiber. The uniformity exceeding the limit condition is that the tested fiber preparation uniformity does not meet the standard. The preparation parameters in step S1 include oil bath temperature, stirring speed and stirring time.

[0027] This invention uses a flexible material to adsorb molten paraffin wax, which is then stirred and fused with a certain proportion of nano-titanium dioxide. After fusion, the mixture solidifies to form a flexible phase change raw material. A novel dry-jet wet spinning process is then used to spin the flexible phase change raw material into a porous fiber fabric. This fabric has good air permeability, is strong and durable, and is suitable for practical applications. The textile technology is mature and low-cost. Compared with conventional wet spinning, the new dry-jet wet spinning method has a spinning speed several times higher. It can also use spinnerets with larger apertures and spinning solutions with higher concentrations and viscosity, which is suitable for the flexible phase change raw material solution in this technical solution, significantly and effectively improving the production capacity of the spinning machine.

[0028] Specifically, in step S1, the specific steps for preparing the flexible phase change initial state raw material include: Step S11: Melt paraffin wax. Place the phase change material paraffin wax into a constant temperature oil bath heating magnetic stirrer heated until completely melted. Step S12: Flexible material adsorbs paraffin wax. A flexible material is added to the molten paraffin wax. The oil bath temperature, stirring speed, and stirring time under constant temperature and speed are set during the mixing process. The flexible material's polymer swelling effect in the paraffin wax solvent is used to adsorb the paraffin wax. Step S13: Integrate titanium dioxide by adding a first set amount of nano-titanium dioxide to the mixture of phase change material and flexible material in the stirrer, and setting the oil bath temperature, stirring speed and stirring time under constant temperature and speed during the mixing process, so as to solidify at room temperature to form the flexible phase change raw material. Step S14: The flexible phase change raw material is placed in a screw extruder, heated and melted into a flexible phase change raw material melt, and then extruded and fed into a filter to filter out mechanical impurities and incompletely melted solid material particles. Step S15: Using a mixer installed in the melt delivery pipe at the output end of the filter, the filtered melt is statically mixed to reduce stratification caused by the high viscosity melt, thus preparing the flexible phase change initial state raw material. The set temperature is 10°C to 20°C higher than the melting point of paraffin, and the flexible material includes POE, SEBS or SBS. The first set amount is the initial amount of nano-titanium dioxide added and is set to the minimum amount within the range of nano-titanium dioxide addition. In step S13, the parameters of the mixing process include the initial value of the oil bath temperature, the initial value of the stirring speed, and the constant temperature and constant speed stirring time.

[0029] This invention combines the phase change material paraffin with a flexible material, making the prepared fabric soft and durable. Furthermore, the added nano-titanium dioxide can be decomposed by bacteria under photocatalysis. Due to the electronic structure of nano-titanium dioxide—a filled TiO2 valence band and an empty conduction band—in a water-air system, under sunlight, especially ultraviolet radiation, when the electron energy of nano-titanium dioxide reaches or exceeds its band gap energy, electrons can be excited from the valence band to the conduction band, simultaneously generating corresponding holes in the valence band, i.e., generating electron-hole pairs. Under the action of an electric field, electrons and holes separate and migrate to different positions on the particle surface, undergoing a series of reactions. Oxygen dissolved on the TiO2 surface is adsorbed and captures electrons to form O2. The generated superoxide anion radicals react with most organic compounds (oxidation reaction). The material reacts with organic matter within bacteria to generate CO2 and H2O. Holes oxidize the H2O adsorbed on the TiO2 surface into OH radicals. These OH radicals have strong oxidizing power, attacking unsaturated bonds in organic matter or extracting H atoms to generate new free radicals, triggering a chain reaction that ultimately leads to bacterial decomposition. This results in the fabric prepared by this invention having a sterilization effect. Furthermore, due to the phase change material properties of the fabric, the fabric temperature remains stable, preventing the fabric surface from surviving and rapidly multiplying under high temperatures caused by light exposure. This further enhances the antibacterial effect of the fabric prepared by this invention, making it suitable for applications in masks, protective clothing, and other fabrics. Moreover, paraffin, flexible materials, and nano-titanium dioxide are all white, making them more widely used in practical applications as fabrics.

[0030] Specifically, in step S3, the tensile effect of the secondary fiber is detected to obtain the breaking strength and breaking elongation of the secondary fiber. Based on the comparison results of the breaking strength of the secondary fiber with the preset breaking strength range and the comparison results of the breaking elongation of the secondary fiber with the preset breaking elongation range, it is determined whether the secondary fiber meets the tensile standard. If the tensile strength of the secondary fiber is not less than the minimum value of the preset tensile strength range, and the elongation at break of the secondary fiber is not less than the minimum value of the preset elongation at break range, the secondary fiber is determined to meet the tensile standard, and no parameter adjustment is required in the preparation process. If either the breaking strength or the breaking elongation of the secondary fiber is less than a preset value, the secondary fiber is deemed not to meet the tensile standard, and the titanium dioxide content in the flexible phase change cold storage sterilization raw material is deemed not to meet the standard, and the titanium dioxide content needs to be adjusted.

[0031] Among them, the preset fracture strength range can be adjusted by a limited number of times to adjust the content of titanium dioxide in different batches of flexible fabric and different batches of paraffin solution, so as to prepare flexible phase change cold storage sterilization raw materials with different titanium dioxide contents, and the fracture strength of the flexible phase change cold storage sterilization raw materials is determined by measurement.

[0032] Specifically, in step S3, when the secondary fiber does not meet the tensile standard, the method for adjusting the titanium dioxide content in the preparation process is determined based on the comparison results of the secondary fiber's breaking strength and elongation at break with preset indicators. If the breaking strength and breaking elongation of the secondary fiber are both less than the preset index, it is determined that the content of nano titanium dioxide in the secondary fiber is excessive, and the first adjustment method is adopted to reduce the amount of nano titanium dioxide. If the breaking strength of the secondary fiber is less than the preset breaking strength and the breaking elongation is not less than the preset breaking elongation, it is determined that the content of nano titanium dioxide in the secondary fiber is insufficient, and the amount of nano titanium dioxide is increased by the second adjustment method. If the tensile strength of the secondary fiber is not less than the preset tensile strength and the tensile elongation is less than the preset tensile elongation, it is determined that the content of nano-titanium dioxide in the secondary fiber is excessive, and the amount of nano-titanium dioxide is reduced by the third adjustment method. In the first adjustment method, the reduction amount Δm1 of nano-titanium dioxide is determined by equation (1): Δm1=α×m0 (1) Where m0 is the amount of titanium dioxide added before adjustment, 0 < α < 0.5, and is set according to actual measurement data; In the second adjustment method, the increase in nano-titanium dioxide Δm2 is determined by equation (2): Δm2=β×m0 (2) Where 0 < β < 0.5, the setting is based on actual measurement data; The reduction amount Δm3 of nano-titanium dioxide in the third adjustment method is determined by equation (3): Δm3=γ×m0 (3) Where 0 < γ < α < 0.5, the values ​​are set based on actual measurement data.

[0033] Since changes in the titanium dioxide content can significantly affect the tensile strength and elongation at break of secondary fibers, the tensile effect of the secondary fibers described in this invention is tested to obtain their tensile strength and elongation at break. Based on the comparison results of the tensile strength and elongation at break of the secondary fibers with the preset tensile strength range and the preset elongation at break range, it is determined whether the secondary fibers meet the tensile standards. In this way, the amount of nano-titanium dioxide added during the preparation process can be adjusted in a timely manner to reduce unnecessary rework, provide quality assurance for the tensile strength of the fabric, and enhance the durability of the fabric.

[0034] Specifically, in step S4, the heat setting effect of the semi-fiber is tested to obtain the heat shrinkage rate of the semi-fiber. Based on the comparison between the heat shrinkage rate of the semi-fiber and the preset heat shrinkage rate, it is determined whether the semi-fiber meets the heat setting standard. If the heat shrinkage rate of the semi-fiber is not greater than the preset heat shrinkage rate, it is determined that the thermal stability of the semi-fiber meets the heat setting standard, and no parameter adjustment is required in the heat setting process. If the heat shrinkage rate of the semi-fiber is greater than the preset heat shrinkage rate, it is determined that the thermal stability of the semi-fiber does not meet the heat setting standard, and the parameters of the heat setting process need to be adjusted. The parameter adjustment includes adjusting the setting temperature and / or setting time in step S4.

[0035] In practice, the preset shrinkage ratio can be obtained based on a limited number of tests to prepare the semi-fibers, combined with the requirements of the actual application scenario.

[0036] Specifically, in step S4, during the heat setting effect test of the semi-fiber, when the heat shrinkage rate of the semi-fiber does not meet the heat setting standard, the specific parameter adjustment steps for the heat setting process include: Step S41: Increase the setting temperature during the heat setting process; The adjusted heat setting temperature is determined by equation (4): C1 = CO + ΔC (4) Wherein, C1 is the adjusted heat setting temperature, CO is the initial heat setting temperature set in step S4; ΔC is the temperature increase value, which can be set according to the difference between the specific heat shrinkage rate e and the preset heat shrinkage rate E0, for example, setting ΔC=(e-E0)×θ, where θ is the temperature conversion coefficient, θ>0; or it can be adjusted according to the percentage of the initial heat setting temperature set before the heat setting equipment is adjusted, setting ΔC=a×CO, where a is the percentage coefficient. In order to prevent the semi-fiber properties from changing too much, it is set 0<a<20%, ​​and it is related to the temperature adjustment range and accuracy of the heat setting equipment.

[0037] Step S42, under the first adjustment limit condition, the setting temperature in the heat setting process is adjusted to the highest value in the setting temperature range, and the setting time in the heat setting process is increased. The first adjustment limit condition is that the setting temperature in the heat setting process has been adjusted to the highest value in the setting temperature range and it is determined that the thermal stability of the semi-fiber does not meet the heat setting standard. The adjusted setting time is determined by equation (5): T1 = TO + ΔT (5) Where T1 is the adjusted setting time; T0 is the initial set heat setting time; ΔT is the time increment value, which is set according to the actual measurement data. Optional setting methods include ΔT=T0×g, where g is the adjustment coefficient in a single adjustment process, 0.1<g<0.5.

[0038] This invention adopts the method of first adjusting the setting temperature. Under the first excessive condition, by increasing the setting time, the efficiency of heat setting can be guaranteed first. When it is impossible to balance setting efficiency and setting effect, the setting time can be adjusted to obtain a setting effect that meets the standard.

[0039] This invention performs heat setting effect testing on the semi-finished fiber to obtain its heat shrinkage rate. Based on the comparison between the heat shrinkage rate of the semi-finished fiber and the preset heat shrinkage rate, it determines whether the semi-finished fiber meets the heat setting standard. For problems that do not meet the heat setting standard, a parameter adjustment plan is formulated to adjust the parameters involved in the heat setting operation in a timely manner, reduce unnecessary rework, improve the setting effect of the fabric, and improve the shape and size stability, shrinkage rate, fabric elasticity, and hand feel of the fabric, thereby meeting the requirements of textile processing and use.

[0040] Specifically, in step S6, the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is detected, the nano-titanium dioxide content of the flexible phase change cold storage sterilization fabric in several unit areas is measured to calculate the standard deviation of each nano-titanium dioxide content detection value, and the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric is determined by comparing the standard deviation with the standard deviation of the preset titanium dioxide content. If the standard deviation is not greater than the standard deviation of the preset titanium dioxide content, it is determined that the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is reasonable and the fiber preparation uniformity of the fabric meets the standard, and there is no need to adjust the preparation process parameters. If the standard deviation is greater than the standard deviation of the preset titanium dioxide content, it is determined that the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is unreasonable and the fiber preparation uniformity of the fabric does not meet the standard. The preparation parameters in step S13 of the preparation process need to be adjusted. The standard deviation of the preset titanium dioxide content is calculated by a finite number of experimental measurements, and the preparation parameters in step S13 include oil bath temperature, stirring speed and stirring time.

[0041] In practice, the prepared fabric is divided into several unit area fabrics, and the titanium dioxide content in the fabric is determined by ICP-AES, which uses an inductively coupled plasma atomic emission spectrometer. The principle is to use the colorimetric reaction of tetravalent titanium ions with hydrogen peroxide to form a yellow complex. The absorbance value is measured by ICP-AES, and the concentration of titanium is obtained according to the standard curve corresponding to the absorbance value. The titanium dioxide content is then calculated, and the standard deviation of the titanium dioxide content per unit area of ​​the prepared fabric is calculated.

[0042] Specifically, in step S6, under the condition that the uniformity exceeds the limit, the parameter adjustment step includes: Step S61: Determine the first difference range and the second difference range based on the difference between the standard deviation and the preset standard deviation, and determine the stirring speed increase value and stirring time increase value in step S13. If the difference is within the first difference range, then the first uniformity parameter adjustment method is adopted: The adjusted stirring speed is determined by equation (6): V1=λ1×V0 (6) The adjusted stirring time is determined by equation (7): T3 = μ1 × T2 (7) If the difference is within the second difference range, then the second uniformity parameter adjustment method is adopted; The adjusted stirring speed is determined by equation (8): V1=λ2×V0 (8) The adjusted stirring time is determined by equation (9): T3 = μ2 × T2 (9) Wherein, V1 is the adjusted stirring speed, which is not greater than the corresponding stirring speed threshold. The stirring speed threshold is set by the content of each raw material in the stirrer and the precision of the stirrer; λ1 and λ2 are stirring adjustment coefficients, 1 < λ1 < λ2; V0 is the initial stirring speed; T3 is the adjusted time, which is not greater than the corresponding duration threshold. The duration threshold is set based on the data from a limited number of experiments combined with the content of each raw material in the stirrer; μ1 and μ2 are time adjustment coefficients, 1 < μ1 < μ2; T2 is the initial stirring speed; the thresholds for stirring speed and stirring time are determined based on the mass and volume of the prepared material. The maximum value within the first difference range is less than the minimum value within the second difference range.

[0043] In practice, the first difference range and the second difference range can be divided by a preset number, for example, setting a preset difference K, where K > 0; At this point, the first ratio range is (0, K], and the second ratio range is (K, ∞). It can be understood that although the open interval of the second difference range involves infinity, in the actual scenario, the difference k between the calculated maximum standard deviation of titanium dioxide content and the preset standard deviation is not a huge and unmeasurable data, which will not be elaborated here. At this point, if k∈(0,K], then the first uniformity parameter adjustment method is adopted; If k∈(K,∞), then the second uniformity parameter adjustment method is adopted; Step S62: If the first adjustment method fails, increase the oil bath temperature in step S13; The adjusted oil bath temperature is determined by equation (10): T5 = η × T4 (10) Wherein, the failure of the first adjustment method is when the preparation parameters in step S61 have been adjusted to the corresponding threshold and the fabric uniformity is determined to be non-compliant with the standard, T5 is the adjusted oil bath temperature, η is the oil bath adjustment coefficient, 1 < η, and T4 is the initial oil bath temperature in step S6.

[0044] This invention detects the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric. It measures the nano-titanium dioxide content of several unit areas of the flexible phase change cold storage sterilization fabric to calculate the standard deviation of each nano-titanium dioxide content detection value. The standard deviation is then compared with the standard deviation of a preset titanium dioxide content to determine the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric. Furthermore, a parameter adjustment scheme is developed to address the unevenness issue, improving the uniformity of the nano-titanium dioxide distribution in the fabric and thereby enhancing the overall sterilization and sun protection effects of the fabric.

[0045] Example 1: This example describes the preparation of a flexible phase change cold storage sterilization fabric using SEBS as the flexible material and paraffin wax with a phase change temperature of 28°C as the phase change material. The preparation process parameters are as follows: 40g of paraffin wax with a phase change temperature of 28℃ was placed in a heat-collecting, constant-temperature magnetic stirrer heated in a 40℃ constant-temperature oil bath and heated until completely melted. 10g of SEBS was added, and the constant-temperature heating was set to 120℃. After 20 minutes, the SEBS gradually swelled in the liquid paraffin wax. The mixture was then heated and stirred at 120℃ with the magnetic stirring speed adjusted to 50 rpm for 1 hour. 0.1g of nano-titanium dioxide was added, and the mixture was heated and stirred at 120℃ and 50 rpm for 1 hour to obtain a flexible phase change raw material. This material was placed in a screw extruder, heated and melted into a flexible phase change raw material melt, and then extruded into a filter. After filtration, the melt was statically mixed in a mixer in the melt delivery pipe at the filter output end. Nascent fibers were produced using a dry-jet wet spinning method. The nascent fibers were then stretched on a stretching and twisting machine. Figure 2 As shown, its breaking strength was tested to be 74.35N and its breaking elongation was 27.59mm, which met the tensile standard. After heat setting treatment (at this time, the preset heat shrinkage rate of heat setting was set according to the specific setting process) and it was determined to meet the heat setting standard, it was woven after warping, sizing, warping, splitting, and heddle threading and reed raising processes to produce a flexible phase change cold storage sterilization fabric.

[0046] To verify the excellent cold storage effect of the flexible phase change cold storage sterilization fabric proposed in this invention, DSC tests were performed on the prepared fabric samples. The test results are as follows: Figure 3 As shown, the enthalpy value of the sample fabric was 180.72 J / g, indicating that the new material has a high latent heat of phase change and can achieve a good cold storage effect.

[0047] Example 2: The difference between this example and Example 1 is that the flexible material selected is POE, the constant temperature heating temperature is set to 140℃, and the amount of nano titanium dioxide added is 0.2g.

[0048] Example 3: The difference between this example and Example 1 is that the flexible material selected is SBS, the constant temperature heating temperature is set to 150℃, the magnetic stirring speed is set to 60rpm, and the amount of nano titanium dioxide added is 0.2g.

[0049] Example 4: The difference between this example and Example 1 is that the flexible material selected is 5g SEBS and 5g POE, the constant temperature heating is set to 140℃, and the amount of nano titanium dioxide added is 0.2g.

[0050] The flexible phase change cold storage sterilization fabric prepared by this invention can be applied in various life scenarios, including: Application Example 1: The flexible phase change cold storage sterilization fabric provided by the present invention can be applied to protective masks. The fabric of the present invention is cut into a suitable size and used as the middle filter layer of the mask, with spunbond nonwoven fabric as the inner and outer layers of the mask.

[0051] As protective equipment, face masks are worn over the mouth and nose to filter the air entering the mouth and nose, thus blocking harmful gases, odors, and droplets from entering or exiting the wearer's mouth and nose. In daily life, the role of face masks is irreplaceable. Face masks made by combining the flexible phase-change cooling and sterilization fabric provided in this invention have the following advantages: It is flexible at room temperature, making it easier to fit the face and provide safer and more comprehensive protection; Compared to existing masks that can only passively block germs, the mask provided by this invention can more effectively kill germs and utilize phase change cooling to effectively prevent bacterial growth and reproduction. When used as outdoor protective equipment, masks can directly utilize outdoor ultraviolet radiation to enable nano-titanium dioxide to exert a sterilization effect. Compared to existing disposable protective masks, the mask provided by this invention is more durable and can be washed multiple times, permanently retaining its sterilization effect; The mask provided by this invention has the effect of phase change cooling and heat storage, and has good breathability. When worn in summer or transitional seasons, it is more comfortable and less stuffy. In addition, titanium dioxide has sun protection function and can be used as a sun protection product at the same time.

[0052] Application Example 2: The flexible phase change cold storage sterilization fabric provided by this invention can be directly cut and made into protective clothing and other garments. Compared with existing protective clothing, the protective clothing provided by this invention has the following advantages: Compared to existing protective clothing that can only passively block germs, the protective clothing and other garments provided by this invention can more effectively kill germs and utilize phase change cooling to effectively prevent bacterial growth and reproduction. The fabric provided by this invention is a porous fabric with good breathability; This invention combines phase change cooling materials, making the wearer feel cooler, and titanium dioxide has a sun protection effect, so it can also be used as a sun protection product. The fabrics provided by this invention have low material and manufacturing costs.

[0053] Application Example 3: The flexible phase change cold storage sterilization fabric provided by this invention can be applied to the outer packaging of food or used as tableware such as lunch boxes. This packaging or tableware comprises a five-layer structure, with the flexible phase change cold storage sterilization fabric as the innermost layer, followed by a polyethylene sealing layer, a polyethylene adhesive layer, a packaging shaping layer, and a polyethylene moisture-proof layer. The flexible phase change cold storage sterilization fabric can kill bacteria and mold in food, and effectively prevents bacterial growth through the bactericidal effect of nano-titanium dioxide and the cooling effect of phase change cold storage. Furthermore, the fabric is flexible at room temperature, making it easier to change shape and facilitating practical packaging applications. The polyethylene sealing layer seals the packaging of beverages and other foods to prevent leakage. The polyethylene adhesive layer is bonded to the polyethylene sealing layer and the polyethylene adhesive layer. The packaging shaping layer serves as a shaping support for the packaging to maintain the boxed or barreled packaging of the packaging or tableware. The outermost polyethylene moisture-proof layer is waterproof and moisture-proof.

[0054] Application Example 4: The flexible phase change cold storage sterilization fabric provided by this invention can be directly used to make bed sheets, quilts and other daily necessities used in hospital wards. Compared with the cotton bedding commonly used in hospitals, the hospital bedding provided by this invention can be sterilized and disinfected on its own, and is inexpensive, sturdy and durable.

[0055] Hospital wards are high-risk areas for germs. The effectiveness of hospital-provided ultraviolet (UV) lamps is limited; they only disinfect the parts exposed to UV light. Folded bedding is difficult to disinfect completely with UV lamps and usually requires further cleaning, disinfection, or replacement. Bedding made with the flexible phase-change cooling and sterilization fabric provided by this invention can utilize hospital UV lamps as an auxiliary method, activating the nano-titanium dioxide in the fabric for rapid and comprehensive sterilization, saving on disinfection costs.

[0056] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a flexible phase change cold-storage sterilization fabric, characterized in that, include: Step S1: Prepare initial raw materials. Adsorb molten paraffin with a flexible material and add nano-titanium dioxide for stirring and fusion. After fusion, solidify to form a flexible phase change raw material. Then, statically mix the solution after filtering the flexible phase change raw material to prepare the initial flexible phase change raw material. In step S1, the specific steps for preparing the flexible phase change initial state raw material include: Step S11: Melt paraffin wax. Place the phase change material paraffin wax into a heat-collecting constant-temperature magnetic stirrer at a set temperature and heat until completely melted; the set temperature is 10°C to 20°C higher than the melting point of paraffin wax. Step S12: Flexible material adsorbs paraffin wax. A flexible material is added to the molten paraffin wax. The oil bath temperature, stirring speed, and stirring time under constant temperature and speed are set during the mixing process. The flexible material's polymeric properties in the paraffin wax solvent cause it to adsorb the paraffin wax. The flexible material includes POE, SEBS, or SBS. The first set amount is the initial amount of nano-titanium dioxide added and is set to the minimum amount within the range of nano-titanium dioxide addition. The mass ratio of the phase change material paraffin wax to the flexible material is 4:1, and the phase change temperature of the phase change material paraffin wax is between 20-28°C. Step S13: Integrate titanium dioxide by adding a first set amount of nano-titanium dioxide to the mixture of phase change material and flexible material in the stirrer, and setting the oil bath temperature, stirring speed, and stirring time under constant temperature and speed during the mixing process to solidify and form the flexible phase change raw material at room temperature; the parameters of the mixing process include the initial value of the oil bath temperature, the initial value of the stirring speed, and the constant temperature and speed stirring time. Step S14: The flexible phase change raw material is placed in a screw extruder, heated and melted into a flexible phase change raw material melt, and then extruded and fed into a filter to filter out mechanical impurities and incompletely melted solid material particles. Step S15: Using a mixer installed in the melt delivery pipe at the output end of the filter, the filtered melt is statically mixed to reduce stratification caused by the high viscosity melt, thus preparing the flexible phase change initial state raw material. Step S2: Prepare nascent fibers. After the flexible phase change nascent raw material is processed in the pre-spinning preparation process, it is fed into the spinning machine. The flexible phase change nascent raw material is extruded from the spinneret using the dry-jet wet spinning method. After passing through the air layer, it enters the coagulation bath. After the material cools and solidifies, it is discharged from the coagulation bath to make nascent fibers. Step S3: Prepare secondary fibers by stretching the nascent fibers on a stretching and twisting machine to form secondary fibers. Determine whether the secondary fibers meet the stretching standards based on their breaking strength and elongation at break. Step S4: Heat set the secondary fibers that meet the stretching standard to form semi-fibers, and test the heat setting effect of the semi-fibers. Determine whether the semi-fibers meet the heat setting standard based on the heat setting effect test results. Step S5: Under the first qualified condition, the semi-fiber is woven into a flexible phase change cold storage sterilization fabric after undergoing warping, sizing, beam bonding, splitting, heddle threading and reed raising processes. Step S6: Detect the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric to determine the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric. If the uniformity exceeds the limit, determine the adjustment method of the preparation process parameters in step S1 based on the fiber preparation uniformity. The first qualification condition is that the semi-fiber meets the heat setting standard. The heat setting effect test is to test the heat shrinkage rate of the semi-fiber. The uniformity exceeding the limit condition is that the tested fiber preparation uniformity does not meet the standard. The preparation parameters in step S1 include oil bath temperature, stirring speed and stirring time.

2. The method for preparing the flexible phase change cold storage sterilization fabric according to claim 1, characterized in that, In step S3, the tensile effect of the secondary fiber is detected to obtain the breaking strength and breaking elongation of the secondary fiber. Based on the comparison results of the breaking strength of the secondary fiber with the preset breaking strength range and the comparison results of the breaking elongation of the secondary fiber with the preset breaking elongation range, it is determined whether the secondary fiber meets the tensile standard. If the tensile strength of the secondary fiber is not less than the minimum value of the preset tensile strength range, and the elongation at break of the secondary fiber is not less than the minimum value of the preset elongation at break range, the secondary fiber is determined to meet the tensile standard, and no parameter adjustment is required in the preparation process. If either the breaking strength or the breaking elongation of the secondary fiber is less than a preset value, the secondary fiber is deemed not to meet the tensile standard, and the titanium dioxide content in the flexible phase change cold storage sterilization raw material is deemed not to meet the standard, and the titanium dioxide content needs to be adjusted.

3. The method for preparing the flexible phase change cold storage sterilization fabric according to claim 2, characterized in that, In step S3, when the secondary fiber does not meet the tensile standard, the method for adjusting the titanium dioxide content is determined based on the comparison results of the secondary fiber's breaking strength and elongation at break with preset indicators. If the breaking strength and breaking elongation of the secondary fiber are both less than the preset index, it is determined that the content of nano titanium dioxide in the secondary fiber is excessive, and the first adjustment method is adopted to reduce the amount of nano titanium dioxide. If the breaking strength of the secondary fiber is less than the preset breaking strength and the breaking elongation is not less than the preset breaking elongation, it is determined that the content of nano titanium dioxide in the secondary fiber is insufficient, and the amount of nano titanium dioxide is increased by the second adjustment method. If the tensile strength of the secondary fiber is not less than the preset tensile strength and the tensile elongation is less than the preset tensile elongation, it is determined that the content of nano-titanium dioxide in the secondary fiber is excessive, and the amount of nano-titanium dioxide is reduced by the third adjustment method. In the first adjustment method, the reduction amount Δm1 of nano-titanium dioxide is determined by equation (1): Δm1=α×m0 (1) Where m0 is the amount of titanium dioxide added before adjustment, and 0 < α < 0.5; In the second adjustment method, the increase in nano-titanium dioxide Δm2 is determined by equation (2): Δm2=β×m0 (2) Where 0 < β < 0.5; The reduction amount Δm3 of nano-titanium dioxide in the third adjustment method is determined by equation (3): Δm3=γ×m0 (3) Where 0 < γ < α < 0.

5.

4. The method for preparing the flexible phase change cold storage sterilization fabric according to claim 1, characterized in that, In step S4, the heat setting effect of the semi-fiber is tested to obtain the heat shrinkage rate of the semi-fiber. Based on the comparison between the heat shrinkage rate of the semi-fiber and the preset heat shrinkage rate, it is determined whether the semi-fiber meets the heat setting standard. If the heat shrinkage rate of the semi-fiber is not greater than the preset heat shrinkage rate, it is determined that the thermal stability of the semi-fiber meets the heat setting standard, and no parameter adjustment is required in the heat setting process. If the heat shrinkage rate of the semi-fiber is greater than the preset heat shrinkage rate, it is determined that the thermal stability of the semi-fiber does not meet the heat setting standard, and the parameters of the heat setting process need to be adjusted. The parameter adjustment includes adjusting the setting temperature and / or the setting time in step S4.

5. The method for preparing the flexible phase change cold storage sterilization fabric according to claim 4, characterized in that, In step S4, during the heat setting effect test of the semi-fibers, when the heat shrinkage rate of the semi-fibers does not meet the heat setting standard, the specific parameter adjustment steps for the heat setting process include: Step S41: Increase the setting temperature during the heat setting process; Step S42: Under the first adjustment limit condition, adjust the setting temperature during the heat setting process to the highest value within the setting temperature range, and increase the setting time during the heat setting process; The first adjustment exceeding the limit condition is that the heat setting temperature during the heat setting process has been adjusted to the highest value within the heat setting temperature range and the thermal stability of the semi-fiber does not meet the heat setting standard.

6. The method for preparing the flexible phase change cold storage sterilization fabric according to claim 5, characterized in that, In step S6, the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is detected. The nano-titanium dioxide content of the flexible phase change cold storage sterilization fabric in several unit areas is measured to calculate the standard deviation of each nano-titanium dioxide content detection value. The standard deviation is compared with the preset standard deviation of the titanium dioxide content to determine the fiber preparation uniformity of the flexible phase change cold storage sterilization fabric. If the standard deviation is not greater than the preset standard deviation, it is determined that the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is reasonable and the fiber preparation uniformity of the fabric meets the standard, and there is no need to adjust the preparation process parameters. If the standard deviation is greater than the preset standard deviation, it is determined that the distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric is unreasonable and the fiber preparation uniformity of the fabric does not meet the standard. The preparation parameters in step S13 of the preparation process need to be adjusted. The preparation parameters in step S13 include oil bath temperature, stirring speed, and stirring time.

7. The method for preparing the flexible phase change cold storage sterilization fabric according to claim 6, characterized in that, In step S6, under the condition of excessive uniformity, the parameter adjustment steps for unreasonable distribution of nano-titanium dioxide in the flexible phase change cold storage sterilization fabric include: Step S61: Increase the stirring speed and lengthen the stirring time in step S13 according to the fiber preparation uniformity. Step S62: If the first adjustment method fails, increase the oil bath temperature in step S13; The failure of the first adjustment method occurs when the preparation parameters in step S61 have been adjusted to the corresponding threshold and the fabric uniformity is determined to be non-compliant with the standard.

8. A flexible phase change cold-storage sterilization fabric prepared by the preparation method according to any one of claims 1-7, characterized in that, The flexible phase change cold storage sterilization fabric is composed of phase change material paraffin, nano titanium dioxide and flexible material. The phase change material paraffin is a white organic solid-liquid phase change material, the nano titanium dioxide is a nano-sized powder, and the flexible material is a flexible shaping material composed of polymers, including POE, SEBS and SBS.

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