Double-layer high-protection-performance fireman fire extinguishing protective clothing and preparation method thereof

Abstract

The invention relates to the technical field of fire-fighting lifesaving protective clothing, and particularly discloses double-layer high-protection-performance fireman fire extinguishing protective clothing and a preparation method thereof. Fabric of the double-layer high-protection-performance firefighter fire extinguishing protective clothing comprises an outer layer and an inner layer, and a PTFE film is attached to the side, close to the inner layer, of the outer layer. The raw materials of the outer layer comprise modified aramid fibers and basalt fibers; the raw materials of the inner layer comprise modified aramid fibers and composite spandex fibers. The double-layer high-protection-performance firefighter fire extinguishing protective clothing has the advantages of being light and efficient in protection when firefighters conduct fire extinguishing and rescuing actions, flexible actions of the firefighters are facilitated, and the double-layer high-protection-performance firefighter fire extinguishing protective clothing has high wearing comfort.

Description

Technical Field

[0001] The present application relates to the technical field of fire-fighting and life-saving protective clothing, and more specifically, to a double-layer high-protection performance fire-fighting protective clothing for firefighters and a preparation method thereof. Background Art

[0002] Firefighting protective clothing is the basic safety protection equipment for firefighters. It can effectively protect the torso, head, neck, arms and legs. It is the last line of defense for firefighters when they are fighting fires and rescuing people. Its performance is directly related to the life safety and rescue efficiency of firefighters. With the increasing complexity and diversification of firefighting tasks, the performance requirements for protective clothing are also getting higher and higher. It needs to have excellent fire retardant, heat insulation, waterproof and breathable properties.

[0003] For a long time, in order to ensure the protective performance, most fire-fighting protective clothing on the market has adopted a three-layer or four-layer composite structure. The common three-layer structure includes an outer layer of fireproof material, a middle layer of thermal insulation material and an inner layer of moisture absorption and perspiration material. The four-layer structure adds a waterproof and breathable layer on the basis of the three-layer structure to further enhance the protective performance.

[0004] With respect to the above-mentioned related technologies, the inventors found that although the multi-layer structure of the existing fire protection clothing provides excellent safety protection performance, it also brings the problem of increased weight. When crossing the fire scene, firefighters not only need to wear heavy protective clothing, but also need to carry various rescue equipment, which greatly increases their physical exertion and imposes great restrictions on the firefighters' flexibility of movement.

[0005] In order to achieve lightweight fire-fighting protective clothing, some researchers have begun to develop double-layer fire-fighting protective clothing with a thermal expansion structure or a corrugated tube structure. Although this has achieved certain results in reducing the weight and increasing the efficiency of clothing, this type of fire-fighting protective clothing has the defects of reduced surface wear resistance, reduced fabric seam strength and poor skin-friendliness. It is difficult to take into account the needs of lightweight, comfort and high protection performance, and it is difficult to meet the operational needs of firefighters in complex fire environments. Summary of the invention

[0006] In order to reduce the weight of fire-fighting protective clothing while ensuring that the fire-fighting protective clothing has high protective performance and good comfort, the present application provides a double-layer high-protective performance firefighter fire-fighting protective clothing and a preparation method thereof.

[0007] In the first aspect, the present application provides a double-layer high-protection firefighting protective clothing for firefighters, which adopts the following technical solution: A double-layer high-protection fire-fighting protective clothing for firefighters, the fabric of which includes an outer layer and an inner layer, a PTFE film being attached to one side of the outer layer close to the inner layer; the raw materials of the outer layer include modified aramid fiber and basalt fiber; the raw materials of the inner layer include modified aramid fiber and composite spandex fiber.

[0008] By adopting the above technical scheme, the outer and inner layers of the fabric are made of different materials respectively. The outer layer of the fabric is prepared with modified aramid fiber and basalt fiber, which can give the outside good fireproof and heat-insulating properties. The inner layer of the fabric is prepared with modified aramid fiber and composite spandex fiber, which gives the inner layer better flexibility and air permeability and moisture-wicking properties. The PTFE membrane is bonded to the inner side of the outer layer to further ensure the waterproof and breathable function of the fabric.

[0009] The synergistic effect of the double-layer structure enables the double-layer structure fabric in this application to replace the traditional standard 4-layer combination fabric for the preparation of fire-fighting protective clothing, meeting the standard requirements for protective clothing used in firefighting and rescue, significantly reducing the weight of the protective clothing, and achieving lightweight protective clothing. It can effectively improve the dexterity of firefighters in the process of firefighting and rescue, while ensuring the comfort of wearing.

[0010] Optionally, the raw materials of the composite spandex fiber include, by weight, 20-25 parts of polytetrahydrofuran diol, 6-10 parts of isophorone diisocyanate, 1-3 parts of a hydrophilic molecular chain extender, 0.5-1.5 parts of triethylamine and 3-5 parts of bamboo pulp fiber.

[0011] Optionally, the hydrophilic molecular chain extender is selected from any one of dimethylol propionic acid, dimethylol butyric acid, sodium ethylenediamine sulfonate and triethanolamine.

[0012] Optionally, the method for preparing the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate are mixed, heated and stirred at 80-100° C. in an inert gas atmosphere, cooled to 60-70° C., a hydrophilic molecular chain extender is added, triethylamine is added after continued stirring, and stirring is continued to obtain a polyurethane stock solution; S2: Pour the polyurethane stock solution into water and stir to obtain a polyurethane prepolymer; S3: adding bamboo pulp fiber to polyurethane prepolymer, mixing and stirring to obtain composite spandex stock solution, aging, and then dry spinning to obtain composite spandex fiber.

[0013] By adopting the above technical scheme, the polyurethane prepolymer prepared by polytetrahydrofuran diol and isophorone diisocyanate in a certain ratio has excellent elasticity and strength. By adding a hydrophilic molecular chain extender, a hydrophilic group can be introduced into the polyurethane prepolymer molecular chain, so that the polyurethane prepolymer has hydrophilic properties, so that the subsequently prepared fabric can have good elasticity and water absorption, and can quickly absorb and discharge sweat.

[0014] Furthermore, by adding bamboo pulp fiber and polyurethane prepolymer to prepare composite spandex, the good moisture absorption and perspiration performance and antibacterial properties of natural bamboo pulp fiber can be effectively integrated, and the softness of the composite spandex fiber can be effectively increased, so that the composite spandex fiber can be more skin-friendly and comfortable when preparing the inner layer of the fabric.

[0015] Optionally, the method for preparing the modified aramid fiber comprises the following steps: The aramid fiber is placed in an acetone solution, subjected to ultrasonic treatment for 1-2 hours, then washed with water, dried, and placed in a dopamine solution with a concentration of 2-5 g / L, the pH value is adjusted to 8-8.5, stirred for 5.5-8 hours, washed with water, and dried to obtain the product.

[0016] By adopting the above technical solution, dopamine is used to modify the aramid fiber. Dopamine can spontaneously react to form polydopamine and adhere to the surface of the aramid fiber, thereby effectively enhancing the surface roughness of the aramid fiber. The dopamine molecule contains a variety of active groups, which can effectively improve the surface polarity of the aramid fiber and increase the active sites, so as to improve the problem that the aramid fiber surface is smooth and chemically inert, and the interface performance with other materials is poor.

[0017] The amino and hydroxyl groups in the dopamine molecule can form covalent bonds with the amide groups in the aramid fiber and the silicon-oxygen bonds in the basalt fiber, effectively improving the interfacial bonding ability and bonding stability between the aramid fiber and the basalt fiber, and ensuring that the outer layer of the fabric prepared by blending the modified aramid fiber and the basalt fiber has excellent fireproof and heat-insulating properties as well as mechanical properties.

[0018] When the modified aramid fiber modified by dopamine is blended with spandex fiber to prepare the inner layer of the fabric, it can also improve the wettability between the two fibers, making it easier for the two fibers to contact and combine during the composite blending process, forming a more solid structure, thereby ensuring the flexibility and comfort of the inner layer of the fabric.

[0019] In the second aspect, the present application provides a method for preparing a double-layer high-protection fire-fighting protective clothing for firefighters, using the following technical solution: A method for preparing a double-layer high-protection fire-fighting protective clothing for firefighters comprises the following steps: S1: Using basalt fiber as core yarn and modified aramid fiber as outer covering yarn, twisting them according to the strand ratio of 1:(1.5-2.5), and obtaining an outer layer blended yarn through ring spinning; using the outer layer blended yarn as warp and weft, weaving according to the warp and weft density ratio of (1.3-1.8):1, and obtaining the outer layer of the fabric after shaping; S2: Laminating the PTFE membrane to one side of the outer layer of the fabric through an adhesive to obtain a composite outer layer of the fabric; S3: using modified aramid fiber as core yarn and composite spandex fiber as outer covering yarn, twisting them in a strand ratio of 1:(2-3), and obtaining an inner layer blended yarn through ring spinning; using the outer layer blended yarn as warp and weft, weaving in a warp and weft density ratio of (1-1.5):1, and obtaining an inner layer of fabric after shaping; S4: After the inner layer of the fabric and the composite outer layer of the fabric are stacked on one side with the PTFE film attached, the edges around them are sewed and sealed.

[0020] By adopting the above technical solution, the yarn formed by blending modified aramid fiber as outer yarn and basalt fiber as core yarn has excellent fireproof and heat-insulating properties. Basalt fiber as core yarn can significantly improve the wear resistance and stability of the outer layer of the fabric in different environments, further ensuring the fireproof and heat-insulating properties of the outer layer of the fabric and protecting firefighters from heat damage. The inner layer of the fabric is prepared by using composite spandex fiber as outer yarn and modified aramid fiber as core yarn, which improves the flexibility of the inner layer, so that when firefighters wear protective clothing, the skin feeling and freedom of movement can be greatly improved, thereby improving the comfort of wearing.

[0021] The preparation process of the present application is simple and suitable for large-scale production and manufacturing. It can ensure the overall performance and structural stability of the protective clothing and prepare lightweight, highly protective and comfortable fire-fighting protective clothing for firefighters.

[0022] Optionally, the inner layer of fabric is subjected to the following pretreatment before being sewn with the composite outer layer of fabric: Prepare a cold treatment liquid, spray the cold treatment liquid on the inner layer of the fabric, dry it at 80-120°C after rolling it with a roller, and then perform high-temperature stretching at 150-180°C to obtain a pre-treated inner layer of the fabric; According to weight, the cold finishing liquid includes 4-7 parts of cold finishing agent, 3-6 parts of cold microcapsules, 0.5-0.8 parts of Isocyanate crosslinker and 3-5 parts water.

[0023] By adopting the above technical solution, the cool finishing agent and cool microcapsules are phase change materials. When they come into contact with the skin in a high temperature environment, they can quickly absorb the heat on the skin surface, produce a cool feeling, reduce heat stress, and effectively reduce the body temperature of firefighters during fire fighting and rescue.

[0024] The use of isocyanate cross-linking agent helps to enhance the adhesion and water washability of the effective ingredients of the cold-feeling finishing agent and the cold-feeling microcapsules on the inner layer of the fabric, so that the inner layer of the fabric can stably maintain the cold-feeling effect and ensure the wearing comfort of firefighters' fire-fighting protective clothing.

[0025] Optionally, the combined surface density of the fabric of the double-layer high-protection firefighting protective clothing for firefighters is (420±15) g / m 2 .

[0026] By adopting the above technical solutions, a balance between light weight and high protection performance is effectively achieved while providing good comfort.

[0027] In summary, this application has the following beneficial effects: 1. This application adopts modified aramid fiber as outer covering yarn and basalt fiber as core yarn to prepare the outer layer of the fabric, and uses modified aramid fiber as core yarn and composite spandex fiber as outer covering yarn to prepare the inner layer of the fabric. The PTFF membrane is attached to the inner side of the outer layer to form a composite outer layer, and then a combined fabric is formed to prepare protective clothing. The synergy of the double-layer structure can meet the requirements of fire-fighting protective clothing for fireproofing, heat insulation, waterproofing and wear resistance during fire fighting and rescue, and at the same time improves the wearing comfort of the protective clothing. Compared with the traditional standard 4-layer fabric, the quality is significantly reduced, which also makes an outstanding contribution to the flexibility of firefighters.

[0028] 2. In the present application, dopamine-modified aramid fiber is preferably used. Dopamine can spontaneously form polydopamine and adhere to the surface of aramid fiber, which increases the surface roughness of aramid fiber and effectively improves its wettability, significantly improving the compatibility of aramid fiber when blended with basalt fiber or composite spandex fiber, forming a more solid structure, which ensures that the fabric has better fireproof and heat-insulating properties and flexibility.

[0029] 3. The present application introduces natural bamboo pulp fiber into spandex to form composite spandex fiber, and performs cooling treatment on the inner layer of the fabric, which further enhances the moisture absorption and perspiration wicking performance of the inner layer of the fabric, making it more comfortable. At the same time, it can produce a cool feeling at high temperatures, reduce heat stress, and effectively reduce the body temperature felt by firefighters during firefighting and rescue. DETAILED DESCRIPTION

[0030] The following examples further illustrate the present application in detail.

[0031] raw material Unless otherwise specified, the raw materials used in the preparation examples, embodiments and comparative examples in this application are all commercially available products, specifically: Aramid fiber, which is 30D aramid IIIA fiber; Basalt fiber, 100D basalt fiber; Bamboo pulp fiber, average diameter 50μm, average length 2mm; Dopamine, selected from Shanghai Jieshikai Biotechnology Co., Ltd., CAS: 51-61-6; The laminating agent is a polyester hot melt adhesive selected from Mitsui Chemicals, 210; Cold finishing agent, selected from Shanghai Jieyikang Chemical Technology Co., Ltd., JYK PCM; Cooling microcapsules, selected from Changzhou Hans Chemical Co., Ltd., PCM-COOL; Isocyanate crosslinking agent is anionic water-based blocked isocyanate crosslinking agent HD-8036.

[0032] Preparation example of composite spandex fiber Preparation Example 1 The composite spandex fiber comprises raw materials including 220g of polytetrahydrofuran diol, 80g of isophorone diisocyanate, 20g of a hydrophilic molecular chain extender, 10g of triethylamine and 40g of bamboo pulp fiber, wherein the hydrophilic molecular chain extender is dimethylol propionic acid.

[0033] The preparation method of the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate were mixed, heated and stirred at 90°C in a N2 atmosphere for 2 h, cooled to 70°C, a hydrophilic molecular chain extender was added, and triethylamine was added after continuing to stir for 1 h, and stirring was continued for 35 min to obtain a polyurethane stock solution; S2: Pour the polyurethane stock solution into 800 mL of deionized water and stir for 1 h at a speed of 8000 rpm in a high-speed stirrer to obtain a polyurethane prepolymer; S3: adding bamboo pulp fiber to polyurethane prepolymer, mixing and stirring for 2 hours at a speed of 1500 rpm in a high-speed stirrer to obtain a composite spandex stock solution, aging it, and then obtaining composite spandex fiber by dry spinning.

[0034] Preparation Example 2 The composite spandex fiber comprises raw materials including 250g of polytetrahydrofurandiol, 60g of isophorone diisocyanate, 30g of a hydrophilic molecular chain extender, 15g of triethylamine and 50g of bamboo pulp fiber, wherein the hydrophilic molecular chain extender is sodium ethylenediamine sulfonate.

[0035] The preparation method of the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate were mixed, heated and stirred at 80°C in a N2 atmosphere for 2h, cooled to 60°C, a hydrophilic molecular chain extender was added, and triethylamine was added after continuing to stir for 1h, and stirring was continued for 35min to obtain a polyurethane stock solution; S2: Pour the polyurethane stock solution into 850 mL of deionized water and stir at a speed of 8000 rpm in a high-speed stirrer for 1 h to obtain a polyurethane prepolymer; S3: adding bamboo pulp fiber to polyurethane prepolymer, mixing and stirring for 2 hours at a speed of 1500 rpm in a high-speed stirrer to obtain a composite spandex stock solution, aging it, and then obtaining composite spandex fiber by dry spinning.

[0036] Preparation Example 3 The composite spandex fiber comprises raw materials including 200g of polytetrahydrofurandiol, 100g of isophorone diisocyanate, 10g of a hydrophilic molecular chain extender, 5g of triethylamine and 30g of bamboo pulp fiber, wherein the hydrophilic molecular chain extender is triethanolamine.

[0037] The preparation method of the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate were mixed, heated and stirred at 100°C in a N2 atmosphere for 2 hours, cooled to 70°C, a hydrophilic molecular chain extender was added, and triethylamine was added after continuing to stir for 1 hour, and stirring was continued for 35 minutes to obtain a polyurethane stock solution; S2: Pour the polyurethane stock solution into 900 mL of deionized water and stir for 1 h at a speed of 8000 rpm in a high-speed stirrer to obtain a polyurethane prepolymer; S3: adding bamboo pulp fiber to polyurethane prepolymer, mixing and stirring for 2 hours at a speed of 1500 rpm in a high-speed stirrer to obtain a composite spandex stock solution, aging it, and then obtaining composite spandex fiber by dry spinning.

[0038] Preparation Example 4 The composite spandex fiber comprises raw materials including 220g of polytetrahydrofuran diol, 80g of isophorone diisocyanate, 20g of a hydrophilic molecular chain extender and 10g of triethylamine, wherein the hydrophilic molecular chain extender is dimethylol propionic acid.

[0039] The preparation method of the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate were mixed, heated and stirred at 90°C in a N2 atmosphere for 2 h, cooled to 70°C, a hydrophilic molecular chain extender was added, and triethylamine was added after continuing to stir for 1 h, and stirring was continued for 35 min to obtain a polyurethane stock solution; S2: Pour the polyurethane stock solution into 800 mL of deionized water and stir for 1.5 h at a speed of 8000 rpm in a high-speed stirrer to obtain a polyurethane prepolymer; S3: The polyurethane prepolymer is aged, and after the aged polyurethane prepolymer is dry-spun to obtain composite spandex fiber.

[0040] Preparation Example 5 The composite spandex fiber comprises 220g of polytetrahydrofurandiol, 80g of isophorone diisocyanate, 10g of triethylamine and 40g of bamboo pulp fiber.

[0041] The preparation method of the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate were mixed, heated and stirred at 90°C in a N2 atmosphere for 2 h, cooled to 70°C, triethylamine was added, and stirring was continued for 35 min to obtain a polyurethane stock solution; S2: Pour the polyurethane stock solution into 800 mL of deionized water and stir for 1 h at a speed of 8000 rpm in a high-speed stirrer to obtain a polyurethane prepolymer; S3: adding bamboo pulp fiber to polyurethane prepolymer, mixing and stirring for 2 hours at a speed of 1500 rpm in a high-speed stirrer to obtain a composite spandex stock solution, aging it, and then obtaining composite spandex fiber by dry spinning. Example

[0042] Example 1 A double-layer high-protection performance fire-fighting protective clothing for firefighters, whose fabric includes an outer layer and an inner layer, and a PTFE film is attached to the side of the outer layer close to the inner layer, wherein the raw materials of the outer layer include modified aramid fiber and basalt fiber, and the raw materials of the inner layer include modified aramid fiber and composite spandex fiber obtained in Preparation Example 1.

[0043] The method for preparing the above-mentioned double-layer high-protection performance fire-fighting protective clothing for firefighters comprises the following steps: S1: The aramid fiber was placed in a 3wt% acetone solution, subjected to ultrasonic treatment for 1.5h, then washed with deionized water and dried, then placed in a 2g / L dopamine solution, the pH was adjusted to 8.5, stirred for 5.5h, washed with water and then dried to obtain modified aramid fiber.

[0044] S2: Basalt fiber is used as core yarn and modified aramid fiber is used as outer covering yarn, and twisted in a strand ratio of 1:2, and then the outer layer blended yarn is obtained by ring spinning; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1.5:1, and the twill weaving method is used to weave, and the outer layer of the fabric is obtained after shaping; S3: bonding the PTFE membrane to one side of the outer layer of the fabric through an adhesive to obtain a composite outer layer of the fabric; S4: using modified aramid fiber as core yarn and composite spandex fiber as outer covering yarn, twisting them in a strand ratio of 1:2.5, and ring spinning to obtain inner layer blended yarn; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1.2:1, and the twill weaving method is used to weave, and the inner layer of the fabric is obtained after shaping; S5: After the inner layer of the fabric and the composite outer layer of the fabric are stacked on one side with the PTFE film, the edges around them are sewed and sealed.

[0045] Example 2 A double-layer high-protection performance fire-fighting protective clothing for firefighters, whose fabric includes an outer layer and an inner layer, and a PTFE film is attached to the side of the outer layer close to the inner layer, wherein the raw materials of the outer layer include modified aramid fiber and basalt fiber, and the raw materials of the inner layer include modified aramid fiber and composite spandex fiber obtained in Preparation Example 2.

[0046] The method for preparing the above-mentioned double-layer high-protection performance fire-fighting protective clothing for firefighters comprises the following steps: S1: The aramid fiber was placed in a 3wt% acetone solution, subjected to ultrasonic treatment for 2h, then washed with deionized water and dried, then placed in a 3g / L dopamine solution, the pH was adjusted to 8, stirred for 8h, washed with water and then dried to obtain modified aramid fiber.

[0047] S2: Basalt fiber is used as core yarn and modified aramid fiber is used as outer covering yarn, and twisting is performed according to a strand ratio of 1:2.5, and the outer layer blended yarn is obtained by ring spinning; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1.8:1, and the twill weaving method is used to weave, and the outer layer of the fabric is obtained after shaping; S3: bonding the PTFE membrane to one side of the outer layer of the fabric through an adhesive to obtain a composite outer layer of the fabric; S4: using modified aramid fiber as core yarn and composite spandex fiber as outer covering yarn, twisting them in a strand ratio of 1:2, and ring spinning to obtain inner layer blended yarn; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1:1, and the twill weaving method is used to weave, and the inner layer of the fabric is obtained after shaping; S5: After the inner layer of the fabric and the composite outer layer of the fabric are stacked on one side with the PTFE film, the edges around them are sewed and sealed.

[0048] Example 3 A double-layer high-protection performance fire-fighting protective clothing for firefighters, whose fabric includes an outer layer and an inner layer, and a PTFE film is attached to the side of the outer layer close to the inner layer, wherein the raw materials of the outer layer include modified aramid fiber and basalt fiber, and the raw materials of the inner layer include modified aramid fiber and the composite spandex fiber obtained in Preparation Example 3.

[0049] The method for preparing the above-mentioned double-layer high-protection performance fire-fighting protective clothing for firefighters comprises the following steps: S1: The aramid fiber was placed in a 3wt% acetone solution, subjected to ultrasonic treatment for 1h, then washed with deionized water and dried, then placed in a 5g / L dopamine solution, the pH was adjusted to 8.5, stirred for 6.5h, washed with water and then dried to obtain modified aramid fiber.

[0050] S2: Basalt fiber is used as core yarn and modified aramid fiber is used as outer covering yarn, and twisted at a strand ratio of 1:1.5, and then the outer layer blended yarn is obtained by ring spinning; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1.3:1, and the twill weaving method is used to weave, and the outer layer of the fabric is obtained after shaping; S3: bonding the PTFE membrane to one side of the outer layer of the fabric through an adhesive to obtain a composite outer layer of the fabric; S4: using modified aramid fiber as core yarn and composite spandex fiber as outer covering yarn, twisting them in a strand ratio of 1:3, and ring spinning to obtain inner layer blended yarn; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1.5:1, and the twill weaving method is used to weave, and the inner layer of the fabric is obtained after shaping; S5: After the inner layer of the fabric and the composite outer layer of the fabric are stacked on one side with the PTFE film, the edges around them are sewed and sealed.

[0051] Example 4 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the composite spandex fiber used is obtained from Preparation Example 4, and the other steps are the same as Example 1.

[0052] Example 5 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the composite spandex fiber used is obtained from Preparation Example 5, and the other steps are the same as Example 1.

[0053] Example 6 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the inner layer of the fabric is subjected to the following pretreatment before being sewn with the composite outer layer of the fabric: S1: 4 parts by weight of a cold finishing agent, 6 parts by weight of cold microcapsules, 0.5 parts by weight of an isocyanate crosslinking agent and 5 parts by weight of water are mixed and stirred to prepare a cold treatment liquid; S2: Spray the cold treatment liquid on the inner layer of the fabric until the inner layer of the fabric is soaked, and the impregnation rate is 75%. The soaked inner layer of the fabric is rolled dry and then dried at 120°C, and then high-temperature stretched at 170°C to obtain a pretreated inner layer of the fabric; the other steps are the same as Example 1.

[0054] Example 7 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the inner layer of the fabric is subjected to the following pretreatment before being sewn with the composite outer layer of the fabric: S1: 7 parts by weight of a cold finishing agent, 3 parts by weight of cold microcapsules, 0.8 parts by weight of an isocyanate crosslinking agent and 5 parts by weight of water are mixed and stirred to prepare a cold treatment liquid; S2: Spray the cold treatment liquid on the inner layer of the fabric until the inner layer of the fabric is soaked, and the impregnation rate is 75%. The soaked inner layer of the fabric is rolled dry and then dried at 120°C, and then high-temperature stretched at 180°C to obtain the pretreated inner layer of the fabric; the other steps are the same as Example 1.

[0055] Example 8 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the inner layer of the fabric is subjected to the following pretreatment before being sewn with the composite outer layer of the fabric: S1: 5 parts by weight of a cold finishing agent, 5 parts by weight of cold microcapsules, 0.6 parts by weight of an isocyanate crosslinking agent and 3 parts by weight of water are mixed and stirred to prepare a cold treatment liquid; S2: Spray the cold treatment liquid on the inner layer of the fabric until the inner layer of the fabric is soaked, and the impregnation rate is 75%. The soaked inner layer of the fabric is rolled dry and then dried at 80°C, and then high-temperature stretched at 150°C to obtain a pretreated inner layer of the fabric; the other steps are the same as Example 1.

[0056] Comparative Example Comparative Example 1 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the aramid fibers used in the outer layer and the inner layer of the fabric are pretreated aramid fibers and have not been modified by dopamine solution. The specific steps of step S1 are: The aramid fiber was placed in a 3wt% acetone solution and subjected to ultrasonic treatment for 1.5h, and then washed with deionized water and dried to obtain a pretreated aramid fiber; The other steps are the same as those in Example 1.

[0057] Comparative Example 2 A double-layer high-protection fire-fighting protective clothing for firefighters, which is different from Example 1 in that the specific steps of step S2 are: using modified aramid fiber as core yarn and basalt fiber as outer covering yarn, twisting them according to a strand ratio of 2:1, and obtaining an outer layer blended yarn through ring spinning; The outer layer blended yarn is used as the warp and weft, and the warp and weft density ratio is 1.5:1, and the twill weaving method is used to weave, and the outer layer of the fabric is obtained after shaping; The other steps are the same as those in Example 1.

[0058] Comparative Example 3 A double-layer high-protection performance fire-fighting protective clothing for firefighters, which differs from Example 1 in that the composite spandex fiber in the inner layer material of the fabric is replaced by modified aramid fiber, and the other steps are the same as Example 1.

[0059] Performance testing Test Example 1 With reference to the relevant method regulations and standard requirements of GB8965.1-2020 and XF 10-2014, the flame retardancy, thermal stability, breaking strength and tear strength of the composite outer layer of the double-layer high protection performance firefighter fire extinguishing protective clothing fabric obtained in Examples 1-3 and Comparative Examples 1-2 were tested. Each group of tests was performed 3 times, and the average value of the 3 test results was taken as the final result and the final result was recorded in Table 1.

[0060] Table 1 According to the performance test results in Table 1, it can be seen that the double-layer high-protection performance firefighter fire-fighting protective clothing fabric composite outer layer of the present application has high flame retardancy and thermal stability, and at the same time has excellent mechanical properties, which can ensure that firefighters get sufficient thermal protection during the fire fighting and rescue process, thereby ensuring their personal safety.

[0061] It can be seen from the performance test results of Examples 1-3 and Comparative Examples 1-2 that the surface roughness of the aramid fiber modified by dopamine is improved, the wettability is effectively improved, and the compatibility between the aramid fiber and the basalt fiber, the outer layer of the fabric and the PTFE membrane is significantly improved when the aramid fiber and the basalt fiber are blended to prepare the composite outer layer of the fabric, forming a more solid structure, which ensures that the fabric has more excellent fireproof and heat-insulating properties and mechanical properties.

[0062] When basalt fiber and modified aramid fiber are blended to prepare the composite outer layer of the fabric, the modified aramid fiber is used as the outer yarn and the basalt fiber is used as the core yarn, which can provide additional strength and stability for the fabric, while enhancing the thermal insulation and flame retardant properties of the fabric, thereby obtaining a composite outer layer of the fabric with better mechanical properties.

[0063] Test Example 2 The thermal protection performance and combined surface density of the double-layer high-protection firefighter fire extinguishing protective clothing fabrics obtained in Examples 1-8 and Comparative Examples 1-3 were compared with the commercially available standard 4-layer combined structure firefighter fire extinguishing protective clothing fabric (outer layer: single-layer 100% IIIA aramid twill plaid cloth; waterproof and breathable layer: aramid spunlace felt composite PTFE membrane; thermal insulation layer: aramid spunlace felt; comfort layer: aramid / flame retardant viscose blended fabric) in accordance with the relevant method provisions and standard requirements of GB8965.1-2020 and XF 10-2014. Each group of tests was performed 3 times, and the average of the 3 test results was taken as the final result and the final result was recorded in Table 2.

[0064] Table 2 According to the performance test results in Table 2, it can be seen that the double-layer high-protection performance firefighter firefighting protective clothing of this application can maintain high protection performance on the basis of effectively reducing the weight of the protective clothing, and can maintain the protection performance of the standard 4-layer combined structure protective clothing while reducing the layer, which makes an outstanding contribution to the firefighter's flexibility and thermal protection. The TPP thermal protection performance of the double-layer high-protection performance firefighter firefighting protective clothing of this application can meet the standard requirements of thermal protection performance in standard XF 10-2014 (not less than 28cal / cm 2 ).

[0065] According to the performance test results of Examples 1-3 and Examples 6-8, it can be seen that the inner layer of the fabric after the cold heat treatment can have a favorable effect on the TPP thermal protection performance of the protective clothing, further ensuring that firefighters can get sufficient thermal protection during the fire fighting and rescue process to ensure their personal safety.

[0066] Test Example 3 With reference to the relevant provisions of GB / T12704-1991 and GB / T5453-1997, the moisture permeability and air permeability of the inner layer of the double-layer high-protection firefighter fire extinguishing protective clothing fabric obtained in Examples 1-8, Comparative Example 1 and Comparative Example 3 were measured, and each group of tests was performed 3 times. The average value of the 3 test results was taken as the final result and the final result was recorded in Table 3.

[0067] Table 3 Group Air permeability (mm / s) <![CDATA[Water vapor transmission rate (g / m 2 / 24h)]]> Example 1 205 5126 Example 2 210 5250 Example 3 202 5133 Example 4 171 2580 Example 5 198 3992 Example 6 200 5103 Example 7 201 5098 Example 8 200 5122 Comparative Example 1 185 4593 Comparative Example 3 135 1601 According to the performance test results in Table 3, it can be seen that using composite spandex fiber as the inner layer material of the firefighters' firefighting protective clothing fabric can effectively improve the air permeability and moisture discharge of the protective clothing fabric, which helps firefighters to absorb and discharge sweat in time during the firefighting and rescue process, making it more skin-friendly and comfortable to wear, avoiding discomfort to the body caused by stuffiness in the protective clothing and sweat stains retained on the skin surface, thereby increasing the burden on firefighters.

[0068] According to the performance test results of Examples 1-3, Examples 4-5 and Comparative Example 3, it can be seen that the composite spandex prepared by compounding natural bamboo pulp fiber with polyurethane prepolymer can effectively improve the moisture absorption and perspiration performance of the inner layer of the fabric, making the composite spandex fiber more skin-friendly and comfortable when preparing the inner layer of the fabric.

[0069] By adding hydrophilic molecular chain extenders, hydrophilic groups can be introduced into the polyurethane prepolymer molecular chain, which can effectively improve the hydrophilicity of the polyurethane prepolymer, so that the subsequently prepared fabric can have better elasticity and water absorption, and promote the fabric to absorb and discharge sweat in a high temperature environment.

[0070] According to the performance test results of Examples 1-3 and Comparative Example 1, it can be seen that the air permeability and moisture permeability of the inner layer of the fabric prepared from the unmodified aramid fiber and the composite spandex fiber are poor. This is because the surface roughness of the aramid fiber modified with dopamine is improved, which provides more pore channels for the penetration of water vapor molecules, and the interface bonding strength between the fiber and the composite spandex is also higher, which effectively overcomes the disadvantage of its own poor hygroscopicity and achieves a better effect of blending the two fibers.

[0071] According to the performance test results of Examples 1-3 and Examples 6-8, it can be seen that the cooling treatment will not have an adverse effect on the air permeability and moisture dissipation of the inner layer of the fabric, and can ensure that when it contacts the skin in a high temperature environment, it can quickly absorb the heat on the skin surface, produce a cool feeling, reduce heat stress, and effectively reduce the body temperature of firefighters during fire fighting and rescue.

[0072] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A double-layer high-protection firefighting protective clothing for firefighters, characterized in that: The fabric of the double-layer high-protection performance firefighter fire-fighting protective clothing includes an outer layer and an inner layer, and a PTFE film is attached to the side of the outer layer close to the inner layer; the raw materials of the outer layer include modified aramid fiber and basalt fiber; the raw materials of the inner layer include modified aramid fiber and composite spandex fiber.

2. The double-layer high-protection firefighting protective clothing for firefighters according to claim 1 is characterized in that: In parts by weight, the raw materials of the composite spandex fiber include 20-25 parts of polytetrahydrofuran diol, 6-10 parts of isophorone diisocyanate, 1-3 parts of a hydrophilic molecular chain extender, 0.5-1.5 parts of triethylamine and 3-5 parts of bamboo pulp fiber.

3. The double-layer high-protection firefighting protective clothing for firefighters according to claim 2 is characterized in that: The hydrophilic molecular chain extender is selected from any one of dimethylol propionic acid, dimethylol butyric acid, sodium ethylenediamine sulfonate and triethanolamine.

4. The double-layer high-protection firefighting protective clothing for firefighters according to claim 2 is characterized in that: The preparation method of the composite spandex fiber comprises the following steps: S1: polytetrahydrofuran diol and isophorone diisocyanate are mixed, heated and stirred at 80-100° C. in an inert gas atmosphere, cooled to 60-70° C., a hydrophilic molecular chain extender is added, triethylamine is added after continued stirring, and stirring is continued to obtain a polyurethane stock solution; S2: pouring the polyurethane stock solution into water and stirring to obtain a polyurethane prepolymer; S3: adding bamboo pulp fiber to polyurethane prepolymer, mixing and stirring to obtain composite spandex stock solution, aging, and then dry spinning to obtain composite spandex fiber.

5. The double-layer high-protection firefighting protective clothing for firefighters according to claim 1 is characterized in that: The preparation method of the modified aramid fiber comprises the following steps: The aramid fiber is placed in an acetone solution, subjected to ultrasonic treatment for 1-2 hours, then washed with water, dried, and placed in a dopamine solution with a concentration of 2-5 g / L, the pH value is adjusted to 8-8.5, stirred for 5.5-8 hours, washed with water, and dried to obtain the product.

6. A method for preparing a double-layer high-protection fire-fighting protective clothing for firefighters according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: Using basalt fiber as core yarn and modified aramid fiber as outer covering yarn, twisting them according to the strand ratio of 1:(1.5-2.5), and obtaining an outer layer blended yarn through ring spinning; using the outer layer blended yarn as warp and weft, weaving according to the warp and weft density ratio of (1.3-1.8):1, and obtaining the outer layer of the fabric after shaping; S2: Laminating the PTFE membrane to one side of the outer layer of the fabric through an adhesive to obtain a composite outer layer of the fabric; S3: using modified aramid fiber as core yarn and composite spandex fiber as outer covering yarn, twisting them in a strand ratio of 1:(2-3), and obtaining an inner layer blended yarn through ring spinning; using the outer layer blended yarn as warp and weft, weaving in a warp and weft density ratio of (1-1.5):1, and obtaining an inner layer of fabric after shaping; S4: After the inner layer of the fabric and the composite outer layer of the fabric are stacked on one side with the PTFE film attached, the edges around them are sewed and sealed.

7. The method for preparing the double-layer high-protection fire-fighting protective clothing for firefighters according to claim 6 is characterized in that: The inner layer of fabric is subjected to the following pretreatment before being sewn with the composite outer layer of fabric: Prepare a cold treatment liquid, spray the cold treatment liquid on the inner layer of the fabric, dry it at 80-120°C after rolling it with a roller, and then perform high-temperature stretching at 150-180°C to obtain a pre-treated inner layer of the fabric; In parts by weight, the cold feeling finishing liquid comprises 4-7 parts of a cold feeling finishing agent, 3-6 parts of cold feeling microcapsules, 0.5-0.8 parts of an isocyanate crosslinking agent and 3-5 parts of water.

8. The method for preparing the double-layer high-protection fire-fighting protective clothing for firefighters according to claim 7, characterized in that: The combined surface density of the fabric of the double-layer high-protection fire-fighting protective clothing for firefighters is (420±15) g / m 2 .

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