Heat storage fabric based on human body heat radiation and preparation method thereof

Abstract

The invention relates to a heat storage fabric based on heat radiation of a human body and a preparation method thereof, and belongs to the technical field of fabric production, the heat storage fabric is obtained by blending functional fibers and elastic fibers, and spinning solution raw materials of the functional fibers comprise coconut fibers, cashmere protein fibers, lithium tungsten bronze nano powder and ionic liquid, the raw materials of the ionic liquid comprise polyvinyl alcohol, urea and a calcium chloride ternary solvent. According to the invention, a spinning solution which contains lithium tungsten bronze nano powder and is mixed with coconut fiber and cashmere protein fiber is adopted, and the functional fiber which has a fine inner pore structure and is wrapped with uniformly distributed lithium tungsten bronze nano powder is prepared through wet spinning treatment, cold stretching treatment and freeze drying treatment which are sequentially carried out; the heat storage fabric blended with the functional fiber has good heat storage performance, fracture resistance and rebound resilience.

Description

Technical Field

[0001] The present invention belongs to the technical field of fabric production, and in particular relates to a heat storage fabric based on human body thermal radiation and a preparation method thereof. Background Art

[0002] With the continuous development of fabric production technology, the performance of functional fabrics is gradually improving, and their types are gradually increasing. Among them, the research and development of thermal insulation fabrics has always been a hot topic in the industry. The research on thermal insulation fabrics can be subdivided into directions including thermal insulation fabrics, heat storage fabrics and self-heating fabrics. Among them, the research hotspot is the application of functional materials such as phase change materials, photothermal conversion materials and materials that absorb thermal radiation in fabrics.

[0003] The existing technology produces heat-storage fabrics by introducing functional materials such as volcanic rocks, graphene and carbon nanotubes during the production process. However, the introduction of functional materials will not only improve the heat storage performance of the fabric, but also affect the mechanical properties including fracture resistance, air permeability and elasticity. The decline in the mechanical properties of the fabric will indirectly affect the heat storage performance of the fabric. In this regard, the present invention provides a heat-storage fabric based on human body thermal radiation and a preparation method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a heat storage fabric based on human body thermal radiation and a preparation method thereof in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: The present invention provides a heat storage fabric based on human body heat radiation, wherein the heat storage fabric is obtained by blending functional fibers with elastic fibers; The spinning solution raw materials of the functional fiber include coconut shell fiber, cashmere protein fiber, lithium tungsten bronze nanopowder and ionic liquid. The ionic liquid raw materials include polyvinyl alcohol, urea and calcium chloride ternary solvent.

[0006] As a further optimized solution of the present invention, the spinning solution raw material comprises, by weight, 5-8 parts of coconut shell fiber, 6-14 parts of cashmere protein fiber, 8-12 parts of lithium tungsten bronze nanopowder, and 35-45 parts of ionic liquid.

[0007] As a further optimized solution of the present invention, the composition of the ionic liquid raw material includes, by weight, 10-15 parts of polyvinyl alcohol, 5-8 parts of urea and 40-50 parts of calcium chloride ternary solvent.

[0008] As a further optimized solution of the present invention, the elastic fiber is any one of spandex fiber, polyester fiber and polyetherester fiber.

[0009] The present invention also provides a method for preparing a heat storage fabric based on human body thermal radiation, comprising the following steps: S1, uniformly mixing polyvinyl alcohol, urea and calcium chloride ternary solvent to obtain an ionic liquid; S2, adding coconut shell fiber, cashmere protein fiber and lithium tungsten bronze nanopowder into the ionic liquid and stirring them thoroughly to obtain a spinning solution after they are completely dissolved; S3. Spinning the spinning solution to obtain nascent fibers, using a spinning technique of wet spinning in a methanol coagulation bath; S4, sequentially performing cold stretching and freeze drying on the as-spun fibers to obtain functional fibers; S5. Blending functional fibers with elastic fibers to obtain heat storage fabrics.

[0010] As a further optimization solution of the present invention, in S4, the temperature during the cold stretching treatment is 15-20°C, and the stretching ratio is 1.5-3.

[0011] As a further optimization scheme of the present invention, in S4, the treatment temperature during the freeze-drying treatment is -55°C to -30°C, the vacuum degree is 0.1-0.3 MPa, and the duration is 3-5 hours.

[0012] The beneficial effects of the present invention are: The present invention obtains an ionic liquid by compounding polyvinyl alcohol, urea and calcium chloride ternary solvents, and obtains a spinning solution of functional fibers after evenly mixing coconut shell fibers, cashmere protein fibers and lithium tungsten bronze nanopowder into the ionic liquid. The spinning solution is then processed into functional fibers through sequential wet spinning, cold stretching and freeze drying. The functional fibers have a fine pore structure and are coated with evenly distributed lithium tungsten bronze nanopowders, so that the heat storage fabric obtained by blending the functional fibers can achieve a good heat storage effect by absorbing thermal radiation. The special structure of the functional fibers and the use of the ternary solvents of urea, calcium chloride and coconut shell fibers in the spinning solution enable the heat storage fabric to have excellent fracture resistance and high resilience, and the mechanical properties can indirectly assist the heat storage fabric in achieving a better heat storage effect. DETAILED DESCRIPTION

[0013] The present application is described in further detail below. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0014] 1. Materials Unless otherwise specified, the methods used in the present invention are conventional methods known to those skilled in the art, and the reagents and other materials used are commercially available products unless otherwise specified.

[0015] The calcium chloride ternary solvent used in the present invention is prepared by mixing calcium chloride, ethanol and water in a mass ratio of 1:3:7.

[0016] method Example 1 A heat storage fabric based on human body thermal radiation is prepared by the following steps: S1. By weight, 10 parts of polyvinyl alcohol, 5 parts of urea and 50 parts of calcium chloride ternary solvent were uniformly mixed to obtain an ionic liquid; S2. Add 10 parts by weight of coconut shell fiber, 5 parts of cashmere protein fiber, and 8 parts of lithium tungsten bronze nanopowder to 45 parts of ionic liquid and stir thoroughly until completely dissolved to obtain a spinning solution; S3. Spinning the spinning solution to obtain nascent fibers, using a spinning technique of wet spinning in a methanol coagulation bath at an extrusion rate of 1 mL / min; S4. The spun fibers are sequentially subjected to cold stretching and freeze drying to obtain functional fibers. The temperature during the cold stretching treatment is 15° C., the stretching ratio is 1.5, and the freeze drying treatment temperature is -55° C., the vacuum degree is 0.1 Pa, and the duration is 5 hours. S5. The functional fiber and the spandex fiber are blended in a mass ratio of 1:1 to obtain a heat storage fabric.

[0017] Example 2 A heat storage fabric based on human body thermal radiation is prepared by the following steps: S1. By weight, 15 parts of polyvinyl alcohol, 8 parts of urea, and 40 parts of calcium chloride ternary solvent were uniformly mixed to obtain an ionic liquid; S2. Add 15 parts of coconut shell fiber, 10 parts of cashmere protein fiber, and 8 parts of lithium tungsten bronze nanopowder, by weight, to 35 parts of ionic liquid and stir thoroughly until completely dissolved to obtain a spinning solution; S3. Spinning the spinning solution to obtain nascent fibers, using a spinning technique of wet spinning in a methanol coagulation bath at an extrusion rate of 3 mL / min; S4, sequentially performing cold stretching treatment and freeze drying treatment on the spun fiber to obtain functional fiber, wherein the temperature during the cold stretching treatment is 20°C, the stretching ratio is 3, and the freeze drying treatment temperature is -30°C, the vacuum degree is 0.3 MPa, and the duration is 3 hours; S5. The functional fiber and the spandex fiber are blended in a mass ratio of 1:1 to obtain a heat storage fabric.

[0018] Example 3 A heat storage fabric based on human body thermal radiation is prepared by the following steps: S1. By weight, 13 parts of polyvinyl alcohol, 6 parts of urea, and 45 parts of calcium chloride ternary solvent were uniformly mixed to obtain an ionic liquid; S2. Add 12 parts by weight of coconut shell fiber, 8 parts of cashmere protein fiber, and 10 parts of lithium tungsten bronze nanopowder to 40 parts of ionic liquid and stir thoroughly until completely dissolved to obtain a spinning solution; S3. Spinning the spinning solution to obtain nascent fibers, using a spinning technique of wet spinning in a methanol coagulation bath at an extrusion rate of 2 mL / min; S4. The spun fibers are sequentially subjected to cold stretching and freeze drying to obtain functional fibers. The temperature during the cold stretching treatment is 16° C., the stretching ratio is 2, and the freeze drying treatment temperature is -45° C., the vacuum degree is 0.2 MPa, and the drying time is 4 hours. S5. The functional fiber and the spandex fiber are blended in a mass ratio of 1:1 to obtain a heat storage fabric.

[0019] The prepared heat storage fabrics were subjected to performance tests, and the test items are as follows: 1. Thermal Storage Performance Testing: Refer to GB / T11048-2008, "Textiles for Physiological Comfort - Determination of Thermal and Moisture Resistance under Steady-State Conditions." Tests were conducted using a YG606E textile thermal resistance tester. Five specimens were tested for each thermal storage fabric, and the average of the five test results was used as the representative value. 2. Fracture resistance test: Use Q800 dynamic mechanical analyzer (DMA, TA Instruments, Inc., USA) to conduct stress-strain test on the thermal storage fabric to determine the strength and elastic modulus of the thermal storage fabric. Cut long strips of specimens of equal size from each thermal storage fabric and place the specimens in a tensile fixture with one end fixed and the other end movable with the fixture. The temperature is maintained at 20°C, the frequency is set to 1Hz, and the applied stress is gradually increased from 0 at a rate of 5MPa / s. The strain change of the sample is recorded until the sample breaks. The stress at the breaking point is taken as the tensile strength of the sample; 3. Anti-deformation test: Apply a certain load to the sample to stretch the fabric to 1.5 times its original size. Keep the stretching state for 16 hours. By testing the size of the fabric before and after stretching, the resilience of the fabric can be obtained by comparing the before and after sizes.

[0020] The test results are shown in the following table: ; As can be seen from the above table, the various data in Examples 1-3 are stable and good. This result shows that the preparation method of introducing lithium tungsten bronze nanopowder into the spinning solution during the preparation of functional fibers and then blending the functional fibers to obtain a thermal storage fabric can achieve the effect of enhancing the thermal storage performance of the fabric by leveraging the thermal radiation properties of the lithium tungsten bronze nanopowder. In addition, the calcium chloride ternary solvent, coconut shell fiber, and cashmere protein fiber compounded in the spinning solution, combined with processing techniques such as wet spinning, cold drawing, and freeze drying, make the thermal storage fabric also have good fracture resistance and resilience.

[0021] In order to further explore the correlation between lithium tungsten bronze nanopowder and the thermal storage performance of thermal storage fabrics, the lithium tungsten bronze nanopowder in the spinning solution was replaced with volcanic rock nanopowder with better thermal radiation absorption performance, which was set as comparative example 1; To further explore the effect of the spinning solution system on the mechanical properties of the thermal storage fabric, based on Example 3, the coconut shell fiber in the spinning solution was replaced with cashmere protein fiber, which was set as Comparative Example 2. The calcium chloride ternary solvent in the spinning solution was replaced with a methanol solvent with a volume concentration of 75%, which was set as Comparative Example 3. The thermal storage fabrics obtained in Comparative Examples 1-3 were tested for performance. The test items and methods were the same as those in Example 3. The test results are shown in the following table: ; Based on the data in the table above, the difference between the data in Example 1 and Example 3 shows that replacing the lithium tungsten bronze nanopowder with similar components results in a decrease in thermal storage performance. This result indicates that the spinning solution system used in the present invention is conducive to the lithium tungsten bronze nanopowder exerting its thermal radiation absorption performance. The difference in data between Example 2 and Example 3 shows that the absence of coconut shell fiber leads to a decrease in the mechanical properties of the thermal storage fabric, among which the decrease in tensile strength is significant. This result shows that in the spinning solution system adopted by the present invention, the mixing of coconut shell fiber and cashmere protein fiber can achieve better improvement in fabric performance. It can be seen from the data difference between Comparative Example 3 and Example 3 that the replacement of the calcium chloride ternary solvent in the spinning solution system with the same type causes a significant decrease in the resilience of the heat storage fabric. This result shows that in the spinning solution system of the present invention, the use of calcium chloride ternary solvent as the silk solvent has a compounding effect and has a better effect on improving the performance of the heat storage fabric.

[0022] In order to further explore the effect of cold drafting on the performance of thermal storage fabrics, comparative example 4 was set up. On the basis of Example 3, the cold drafting step was omitted, and thermal storage fabrics were prepared and corresponding performance tests were carried out. The test items and methods were the same as those in Example 3. To further explore the effect of the spinning technology used on the performance of the thermal storage fabric, comparative example 5 was set up. On the basis of Example 3, electrospinning technology was used instead of wet spinning. The spinning voltage used in electrospinning was 20 kV and the spinning solution feed rate was 2 mL / h. Thermal storage fabric was prepared and the corresponding performance tests were carried out. The test items and methods were the same as those in Example 3. The results of the heat storage fabrics in Comparative Examples 4 and 5 are shown below: ; As can be seen from the above table, compared with Example 3, the operation of omitting the cold stretching treatment in Comparative Example 4 and the operation of using the electrospinning technology in Comparative Example 5 both led to a decrease in the fracture resistance and resilience of the heat storage fabric. This result shows that both wet spinning and cold stretching are beneficial to the realization of the mechanical properties of functional fibers. Among them, the use of wet spinning technology is highly correlated with the realization of the fracture resistance of functional fibers, while the cold stretching treatment is highly correlated with the realization of the resilience of functional fibers.

[0023] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A heat storage fabric based on human body heat radiation, characterized in that: The heat storage fabric is obtained by blending functional fibers with elastic fibers; The spinning solution raw materials of the functional fiber include coconut shell fiber, cashmere protein fiber, lithium tungsten bronze nanopowder and ionic liquid, and the ionic liquid raw materials include polyvinyl alcohol, urea and calcium chloride ternary solvent.

2. The heat storage fabric based on human body heat radiation according to claim 1, characterized in that: The spinning solution raw material comprises, by weight, 5-8 parts of coconut shell fiber, 6-14 parts of cashmere protein fiber, 8-12 parts of lithium tungsten bronze nanopowder and 35-45 parts of ionic liquid.

3. The heat storage fabric based on human body heat radiation according to claim 2, characterized in that: The ionic liquid raw material comprises, by weight, 10-15 parts of polyvinyl alcohol, 5-8 parts of urea and 40-50 parts of calcium chloride ternary solvent.

4. The heat storage fabric based on human body heat radiation according to claim 2, characterized in that: The elastic fiber is any one of spandex fiber, polyester fiber and polyetherester fiber.

5. A method for preparing a heat storage fabric based on human body thermal radiation according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, uniformly mixing polyvinyl alcohol, urea and calcium chloride ternary solvent to obtain an ionic liquid; S2, adding coconut shell fiber, cashmere protein fiber and lithium tungsten bronze nanopowder into the ionic liquid and stirring them thoroughly to obtain a spinning solution after they are completely dissolved; S3. Spinning the spinning solution to obtain nascent fibers, using a spinning technique of wet spinning in a methanol coagulation bath; S4, sequentially performing cold stretching and freeze drying on the as-spun fibers to obtain functional fibers; S5. Blending functional fibers with elastic fibers to obtain heat storage fabrics.

6. The method for preparing heat storage fabric based on human body heat radiation according to claim 5, characterized in that: In the above-mentioned S4, the temperature during the cold stretching treatment is 15-20° C., and the stretching ratio is 1.5-3.

7. The method for preparing heat storage fabric based on human body heat radiation according to claim 5, characterized in that: In the above-mentioned S4, the freeze-drying treatment is performed at a temperature of -55°C to -30°C, a vacuum degree of 0.1-0.3 MPa, and a duration of 3-5 hours.