Police clothing fabric convenient for heat dissipation and processing technology

Abstract

The application discloses a police clothing fabric convenient for heat dissipation and a processing technology, and the processing technology comprises the following steps: after carbon fibers are pretreated by a potassium permanganate solution and a KH550 aqueous solution, the carbon fibers are added into N,N-dimethylformamide, then ethylenediaminetetraacetic dianhydride is added into the mixture under stirring, and stirring reaction is carried out; the product is extracted, washed and dried to obtain ethylenediaminetetraacetic dianhydride modified carbon fibers; the modified carbon fibers are added into deionized water, then mannitol is added, concentrated sulfuric acid is used as a catalyst, and stirring reaction is carried out; the product is centrifuged, washed and dried to obtain modified carbon fibers; the modified carbon fibers and PET chips are mixed, then melt spinning is carried out, and the police clothing fabric convenient for heat dissipation is obtained through weaving; the fabric greatly improves the moisture absorption, sweat releasing, air permeability and heat dissipation performance of the fabric, improves the breaking strength of the fabric, and is suitable for being used as a police fabric.

Description

Technical Field

[0001] This invention relates to the field of textiles, specifically to a heat-dissipating fabric for police uniforms and its processing technology. Background Technology

[0002] Currently, the comfort of police uniform fabrics is poor, with poor breathability and sweat-wicking properties, making them unsuitable for high-temperature environments and unable to meet the needs of police officers when performing special tasks.

[0003] Polyester fabric is one of the most widely used synthetic fiber textiles. It features high elasticity and high strength. However, due to the hydrophobic nature of polyester fibers, the fabric often exhibits poor moisture absorption, resulting in sweat not being effectively wicked away and causing a stuffy feeling when wearing polyester fabrics. Therefore, research on improving the coolness and comfort of polyester fibers has attracted much attention from the scientific and industrial communities.

[0004] In the research of moisture-wicking fibers, Japan, the United States, and South Korea started earlier and are at the forefront of research and development. For example, Teijin Corporation of Japan developed WELLKEY fiber, a hollow polyester fiber with many micropores on its surface that extend into the hollow part. Liquid water can penetrate from the fiber surface into the hollow part, giving this fiber the unique properties of fast sweat absorption and dryness. DuPont of the United States developed CoolmaxR polyester fiber with a cross-section resembling a cross-section, a porous structure, and four sweat-wicking grooves on its surface. This forms many tiny capillary tubes with strong capillary effect, quickly drawing moisture away from the skin and keeping it comfortable and dry. Hyosung Group of South Korea launched Aerocool polyester fiber, which mimics alfalfa, with a four-leaf cross-section and microgrooves and pores on its surface, exhibiting excellent moisture-wicking properties.

[0005] Research and development of moisture-wicking fibers in China started relatively late, but significant progress has still been made. Coolplus fiber, developed by Chung Hsing Textile in Taiwan, has a cross-section shaped like a cross, with fine grooves and pores distributed longitudinally. This allows it to instantly wick away moisture and sweat from the skin's surface, keeping the skin dry and cool. COOLBST fiber, developed by Sinopec Yizheng Chemical Fiber Co., Ltd., uses a novel irregular cross-section design and the capillary principle to enable the textile to quickly absorb, transport, and evaporate moisture, thus keeping the skin dry and comfortable. SATIS fiber, developed by Jinan Zhenghao, introduces hydrophilic groups into the fiber macromolecules and has structures such as trilobal (angular) cross-sections, pentlobal cross-sections, and hollow cross-sections, giving the fiber excellent moisture-wicking properties.

[0006] Currently, the moisture-wicking and heat-dissipating fibers produced internationally and domestically use ordinary PET chips. They only improve wearability by physically changing the cross-sectional shape of the fibers and increasing the specific surface area and grooves. However, they do not fundamentally solve the problem of the nature of ordinary polyester fibers, and cannot guarantee the effectiveness of their function after being blended with other fibers. They also cannot overcome the defects of poor initial and later adsorption capacity and functionality.

[0007] For example, Chinese patent document CN201911339998.7 discloses a preparation process of moisture-wicking polyester low-elasticity composite yarn, including the following steps: (1) Preparation of irregular POY raw yarn: Polyester chips are pre-crystallized, homogenized and dried to obtain PET dry chips. The PET dry chips are melted at high temperature, extruded into melt, and then melt-spun, solidified and cooled into filaments to obtain irregular POY raw yarn; (2) Preparation of irregular DTY yarn: The POY raw yarn prepared in step (1) is heated and stretched, and then false-twisted to obtain irregular DTY yarn; (3) Preparation of polyester low-elasticity composite yarn: The irregular POY raw yarn and irregular DTY yarn are combined through a composite yarn guide to form a composite yarn. The composite yarn is shaped, and then oiled and wound to obtain moisture-wicking polyester low-elasticity composite yarn; The prepared polyester low-elasticity composite yarn still has poor functionality.

[0008] Chinese patent document CN201310527150.3 discloses a woven fabric with good moisture absorption, which is made of interwoven warp and weft yarns. The warp yarns are carbon fiber and the weft yarns are polyester fiber. The carbon fiber is FDY250D / 60F and the polyester fiber is FDY300D / 84F. The carbon fiber accounts for 38% to 48% of the main weight of the woven fabric, and the polyester fiber accounts for 52% to 62% of the main weight of the woven fabric. It has the characteristics of good moisture absorption, good thermal stability and flame resistance. However, the cost of this woven fabric is high, and the moisture absorption, perspiration and heat dissipation effects need to be improved. Summary of the Invention

[0009] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a police clothing fabric and processing technology that facilitates heat dissipation, greatly improves the fabric's moisture absorption, perspiration wicking, breathability and heat dissipation performance, and increases the fabric's tensile strength, making it suitable as a police clothing fabric.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A processing technology for police uniform fabric that facilitates heat dissipation includes the following steps:

[0012] (1) Soak the carbon fiber in potassium permanganate solution, then wash and dry it, then immerse it in KH550 aqueous solution, and after the reaction is complete, wash and dry it to obtain pretreated carbon fiber.

[0013] (2) Add the pretreated carbon fiber to N,N-dimethylformamide, then add ethylenediaminetetraacetic acid dianhydride under stirring, stir the reaction, filter, wash and dry the product to obtain ethylenediaminetetraacetic acid dianhydride modified carbon fiber;

[0014] (3) Add the ethylenediaminetetraacetic acid dianhydride modified carbon fiber to deionized water, then add mannitol, use concentrated sulfuric acid as a catalyst, stir the reaction, centrifuge, wash and dry the product to obtain modified carbon fiber.

[0015] (4) Modified carbon fiber and PET chips are added to a ball mill and mixed at high speed to obtain a mixture. Then, the mixture is melt-spun and woven to obtain a police clothing fabric that is easy to dissipate heat.

[0016] Preferably, in step (1), the concentration of potassium permanganate solution is 1-2 mol / L, and the soaking time is 1-3 h.

[0017] Preferably, in step (1), the mass fraction of the KH550 aqueous solution is 5-10 wt%, and the soaking time is 12-18 h.

[0018] Preferably, in step (2), the weight ratio of pretreated carbon fiber, ethylenediaminetetraacetic acid dianhydride, and N,N-dimethylformamide is 10:4-8:40-60; the stirring reaction conditions are 60-75℃ for 4-6 hours; and the washing is carried out sequentially with N,N-dimethylformamide, 0.1mol / L NaOH solution, and deionized water.

[0019] Preferably, in step (3), the weight ratio of ethylenediaminetetraacetic acid dianhydride modified carbon fiber to mannitol is 10:8-12.

[0020] Preferably, in step (3), the concentration of concentrated sulfuric acid is 98 wt%, and the reaction conditions are 140-160°C for 2-4 hours.

[0021] Preferably, in step (4), the weight ratio of modified carbon fiber to PET chips is 1-5:95-99; the high-speed mixing conditions are 500-700 r / min for 30-60 min.

[0022] Preferably, in step (4), the spinning temperature of melt spinning is 260-300℃, the spinning speed is 400-5000m / min, the drawing temperature is 70-160℃, and the drawing ratio is 1-5 times.

[0023] Preferably, in step (4), the cross-section of the fiber obtained by melt spinning is cross-shaped, trilobal, triangular or quadrilobal.

[0024] The present invention also claims a heat-dissipating police uniform fabric prepared using the aforementioned processing technology.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) This invention prepares a police uniform fabric that facilitates heat dissipation by adding modified carbon fiber to PET and combining it with irregular cross-section spinning technology. The addition of modified carbon fiber forms a heat conduction path, and the irregular cross-section structure increases the surface area of ​​spinning, so that the prepared fabric has excellent moisture absorption, perspiration wicking, breathability and heat dissipation effects, which can keep the skin dry and cool. In addition, the fabric has good breaking strength and breaking elongation, and is suitable for weaving police uniform fabric.

[0027] 2) This invention provides a modified carbon fiber. Treatment of the carbon fiber with potassium permanganate improves the surface inertness and enhances its chemical activity. Organic modification of the carbon fiber with KH550 improves its compatibility with PET, while introducing amino groups onto the carbon fiber surface. Subsequently, ethylenediaminetetraacetic acid dianhydride is used for modification. Ring-opening amidation of the amino group and the anhydride introduces dicarboxylic acid into the carbon fiber surface. Finally, mannitol is grafted onto the carbon fiber surface through dehydration condensation. The resulting modified carbon fiber, when added to PET, not only enhances the mechanical strength of the spinning material but also significantly improves its thermal conductivity, heat dissipation, and perspiration wicking properties.

[0028] 3) This invention utilizes the silane coupling agent KH550 to organically modify carbon fibers, which can reduce the agglomeration of carbon fibers in PET, making it easier to form thermally conductive pathways, reducing the thermal barrier between carbon fibers and PET materials, and effectively improving the thermal conductivity and heat dissipation performance of the prepared fabric. By modifying carbon fibers with ethylenediaminetetraacetic dianhydride and mannitol in sequence, a large number of water-absorbing functional groups such as carboxyl and hydroxyl groups are introduced into the surface of carbon fibers. Adding the modified carbon fibers into PET greatly improves the moisture absorption and perspiration wicking performance of the prepared fabric, effectively realizing the moisture wicking, perspiration wicking and heat dissipation functions of the fabric, and has excellent practicality. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] Unless otherwise specified, all chemical reagents and materials in this invention are purchased from the market or synthesized from raw materials purchased from the market.

[0031] PET is polyethylene terephthalate, with a viscosity of 0.8–0.9 dl / g;

[0032] The carbon fiber was purchased from Toray Industries, Inc. of Japan, model T008-003, with a length of 3mm.

[0033] The present invention will be further described below through specific embodiments.

[0034] Example 1

[0035] A processing technology for police uniform fabric that facilitates heat dissipation includes the following steps:

[0036] (1) Soak the carbon fiber in a 1.5 mol / L potassium permanganate solution for 2 h, then wash it with deionized water until neutral, and dry it naturally at room temperature. Soak it in a 10 wt% KH550 aqueous solution for 16 h. After the reaction is complete, wash it repeatedly with deionized water and ethanol, and dry it naturally at room temperature to obtain pretreated carbon fiber.

[0037] (2) 10g of pretreated carbon fiber was added to 50g of N,N-dimethylformamide, and then 8g of ethylenediaminetetraacetic acid dianhydride was added under stirring. The mixture was stirred at 70℃ for 5h. The product was filtered and washed successively with N,N-dimethylformamide, 0.1mol / L NaOH solution and deionized water. It was dried at room temperature to obtain ethylenediaminetetraacetic acid dianhydride modified carbon fiber.

[0038] (3) Add 10g of ethylenediaminetetraacetic acid dianhydride modified carbon fiber to 50mL of deionized water, then add 12g of mannitol, and use 3g of 98wt% concentrated sulfuric acid as a catalyst. Stir the reaction at 150℃ for 3h, centrifuge, wash and dry the product to obtain modified carbon fiber.

[0039] (4) Add 5g of modified carbon fiber and 95g of PET chips to a ball mill and mix at high speed at 600r / min for 45min to obtain a mixture. Then, melt spinning is carried out under the conditions of spinning temperature of 280℃, spinning speed of 2000m / min, drawing temperature of 120℃ and drawing ratio of 3 times. The fiber cross section obtained by melt spinning is cross-shaped. After weaving, a police clothing fabric that is easy to dissipate heat is obtained.

[0040] Example 2

[0041] A processing technology for police uniform fabric that facilitates heat dissipation includes the following steps:

[0042] (1) Soak the carbon fiber in a 1.5 mol / L potassium permanganate solution for 2 h, then wash it with deionized water until neutral, and dry it naturally at room temperature. Soak it in a 10 wt% KH550 aqueous solution for 16 h. After the reaction is complete, wash it repeatedly with deionized water and ethanol, and dry it naturally at room temperature to obtain pretreated carbon fiber.

[0043] (2) 10g of pretreated carbon fiber was added to 50g of N,N-dimethylformamide, and then 4g of ethylenediaminetetraacetic acid dianhydride was added under stirring. The mixture was stirred at 70℃ for 5h. The product was filtered and washed successively with N,N-dimethylformamide, 0.1mol / L NaOH solution and deionized water. It was dried at room temperature to obtain ethylenediaminetetraacetic acid dianhydride modified carbon fiber.

[0044] (3) Add 10g of ethylenediaminetetraacetic acid dianhydride modified carbon fiber to 50mL of deionized water, then add 8g of mannitol, and use 3g of 98wt% concentrated sulfuric acid as a catalyst. Stir the reaction at 150℃ for 3h, centrifuge, wash and dry the product to obtain modified carbon fiber.

[0045] (4) Add 1g of modified carbon fiber and 99g of PET chips to a ball mill and mix at high speed at 600r / min for 45min to obtain a mixture. Then, melt spinning is carried out under the conditions of spinning temperature of 280℃, spinning speed of 2000m / min, drawing temperature of 120℃ and drawing ratio of 3 times. The fiber cross section obtained by melt spinning is cross-shaped. After weaving, a police clothing fabric that is easy to dissipate heat is obtained.

[0046] Example 3

[0047] A processing technology for police uniform fabric that facilitates heat dissipation includes the following steps:

[0048] (1) Soak the carbon fiber in a 1.5 mol / L potassium permanganate solution for 2 h, then wash it with deionized water until neutral, and dry it naturally at room temperature. Soak it in a 10 wt% KH550 aqueous solution for 16 h. After the reaction is complete, wash it repeatedly with deionized water and ethanol, and dry it naturally at room temperature to obtain pretreated carbon fiber.

[0049] (2) 10g of pretreated carbon fiber was added to 50g of N,N-dimethylformamide, and then 6g of ethylenediaminetetraacetic acid dianhydride was added under stirring. The mixture was stirred at 70℃ for 5h. The product was filtered and washed successively with N,N-dimethylformamide, 0.1mol / L NaOH solution and deionized water. It was dried at room temperature to obtain ethylenediaminetetraacetic acid dianhydride modified carbon fiber.

[0050] (3) Add 10g of ethylenediaminetetraacetic acid dianhydride modified carbon fiber to 50mL of deionized water, then add 10g of mannitol, and use 3g of 98wt% concentrated sulfuric acid as a catalyst. Stir the reaction at 150℃ for 3h, centrifuge, wash and dry the product to obtain modified carbon fiber.

[0051] (4) Add 3g of modified carbon fiber and 97g of PET chips to a ball mill and mix at high speed at 600r / min for 45min to obtain a mixture. Then, melt spinning is carried out under the conditions of spinning temperature of 280℃, spinning speed of 2000m / min, drawing temperature of 120℃ and drawing ratio of 3 times. The fiber cross section obtained by melt spinning is cross-shaped. After weaving, a police clothing fabric that is easy to dissipate heat is obtained.

[0052] Comparative Example 1

[0053] A garment fabric processing technique includes the following steps:

[0054] 5g of carbon fiber and 95g of PET chips were added to a ball mill and mixed at 600r / min for 45min to obtain a mixture. Then, melt spinning was carried out under the conditions of spinning temperature of 280℃, spinning speed of 2000m / min, drawing temperature of 120℃ and drawing ratio of 3 times. The fiber cross section obtained by melt spinning is cross-shaped, and a clothing fabric is obtained by weaving.

[0055] Comparative Example 2

[0056] A garment fabric processing technique includes the following steps:

[0057] (1) Soak the carbon fiber in a 1.5 mol / L potassium permanganate solution for 2 h, then wash it with deionized water until neutral, and dry it naturally at room temperature. Soak it in a 10 wt% KH550 aqueous solution for 16 h. After the reaction is complete, wash it repeatedly with deionized water and ethanol, and dry it naturally at room temperature to obtain pretreated carbon fiber.

[0058] (2) 10g of pretreated carbon fiber was added to 50g of N,N-dimethylformamide, and then 8g of ethylenediaminetetraacetic acid dianhydride was added under stirring. The mixture was stirred at 70℃ for 5h. The product was filtered and washed successively with N,N-dimethylformamide, 0.1mol / L NaOH solution and deionized water. It was dried at room temperature to obtain ethylenediaminetetraacetic acid dianhydride modified carbon fiber.

[0059] (3) Add 5g of ethylenediaminetetraacetic acid dianhydride modified carbon fiber and 95g of PET chips to a ball mill and mix at high speed at 600r / min for 45min to obtain a mixture. Then, melt spinning is carried out under the conditions of spinning temperature of 280℃, spinning speed of 2000m / min, drawing temperature of 120℃ and drawing ratio of 3 times. The fiber cross section obtained by melt spinning is cross-shaped, and a clothing fabric is obtained by weaving.

[0060] For the fabrics prepared in Examples 1-3 and Comparative Examples 1-2, the following tests were conducted: water absorption rate and evaporation rate were tested according to GB / T 21655.1-2023 "Evaluation of moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method", air permeability was tested according to GB / T 5453-1997 "Textiles - Determination of air permeability of fabrics", and breaking strength and elongation at break were tested according to GB / T3923.1-2013 "Textiles - Tensile properties of fabrics - Part 1: Determination of breaking strength and elongation at break (strip method)". The specific test data are shown in Table 1.

[0061] Table 1. Fabric performance test results

[0062]

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A process for processing a police garment fabric for facilitating heat dissipation, characterized in that, It comprises the following steps: (1) carbon fibers are soaked in potassium permanganate solution, then washed and dried, and then immersed in a KH550 aqueous solution, washed and dried after reaction, to obtain pretreated carbon fibers; (2) the pretreated carbon fibers are added to N,N-dimethylformamide, then ethylenediaminetetraacetic dianhydride is added under stirring, and the product is filtered, washed and dried after stirring reaction, to obtain ethylenediaminetetraacetic dianhydride modified carbon fibers; (3) the ethylenediaminetetraacetic dianhydride modified carbon fibers are added to deionized water, then mannitol is added, and the product is centrifuged, washed and dried after stirring reaction with concentrated sulfuric acid as catalyst, to obtain modified carbon fibers; (4) the modified carbon fibers and PET chips are mixed at high speed in a ball mill to obtain a mixture, then melt spinning is carried out, and a police clothing fabric facilitating heat dissipation is obtained by weaving.

2. The process of claim 1, wherein, In step (1), the concentration of potassium permanganate solution is 1-2 mol / L, and the soaking time is 1-3 h.

3. The process of claim 1 wherein, In step (1), the mass fraction of KH550 aqueous solution is 5-10 wt%, and the immersion time is 12-18 h.

4. The process of claim 1 wherein, In step (2), the weight ratio of pretreated carbon fibers, ethylenediaminetetraacetic dianhydride and N,N-dimethylformamide is 10:4-8:40-60; the stirring reaction conditions are 60-75℃ for 4-6 h; and the washing is carried out with N,N-dimethylformamide, 0.1 mol / L NaOH solution and deionized water in sequence.

5. The process of claim 1 wherein, In step (3), the weight ratio of ethylenediaminetetraacetic dianhydride modified carbon fibers and mannitol is 10:8-12.

6. The process of claim 1, wherein, In step (3), the concentration of concentrated sulfuric acid is 98 wt%, and the stirring reaction conditions are 140-160℃ for 2-4 h.

7. The process of claim 1 wherein, In step (4), the weight ratio of modified carbon fibers and PET chips is 1-5:95-99; and the high-speed mixing conditions are 500-700 r / min for 30-60 min.

8. The process of claim 1 wherein, In step (4), the spinning temperature of melt spinning is 260-300℃, the spinning speed is 400-5000 m / min, the drawing temperature is 70-160℃, and the drawing ratio is 1-5 times.

9. The process of claim 1 wherein, In step (4), the cross section of the fiber obtained by melt spinning is cross-shaped, trilobal, triangular or quadrilobal.

10. A police clothing fabric facilitating heat dissipation prepared by the processing technology of any one of claims 1-9.

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