Airtight chemical protective clothing fabric and preparation method thereof

Abstract

The invention relates to the technical field of protective clothing, and particularly discloses an airtight chemical protective clothing fabric and a preparation method thereof. The airtight chemical protective clothing fabric comprises a chemical protective layer, a flame-retardant layer, an antistatic layer, a protective layer and a comfortable layer which are sequentially bonded from the outer layer to the inner layer. The chemical defense layer and the protective layer are both compact polymeric membranes; the antistatic layer is cloth embedded with carbon black conductive fibers; the carbon black conductive fibers are fibers formed by embedding poly (3, 4-ethylenedioxythiophene)-poly (styrene sulfonic acid) and phenoxy polyphosphazene into carbonized fibers. The fabric is comfortable to wear, and has the properties of chemical permeation prevention, flame retardance, antistatic property and corrosion resistance. The antistatic layer is cloth embedded with carbon black conductive fibers, poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonic acid) and phenoxy polyphosphazene are embedded into the fibers, the toughness of the fibers is improved, the fibers are resistant to bending, carbon powder is not prone to falling off, and the antistatic fiber has good conductivity and heat resistance and is suitable for the fields of petrochemical engineering and the like with high antistatic requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protective clothing, in particular to a gas-tight chemical protective clothing fabric and a preparation method thereof. BACKGROUND

[0002] The gas-tight chemical protective clothing is a protective clothing worn by individual operators to protect themselves from chemical hazards when working in a site with toxic gases, corrosive liquids or dangerous solid substances.

[0003] The existing problems of the widely used chemical protective clothing in the market are as follows: the material function is single, for example, the synthetic rubber chlorosulfonated polyethylene CSM has good chemical corrosion resistance, but the fabric is heavy and inconvenient to move after wearing; some chemical protective clothing uses polyvinyl chloride PVC net cloth, although the fabric is light in weight, but the material is hard and easy to generate static electricity, which cannot be well applied to the petroleum and chemical flammable and explosive scene; and some chemical protective clothing adopts a multi-layer film composite structure of polyethylene PE film and polypropylene PP non-woven fabric, which can realize light wearing, but is not flame-retardant, has poor strength, is severely deformed after wearing once, and can only be used as disposable chemical protective clothing.

[0004] The above chemical protective clothing has functional deficiencies in flame retardation, anti-static or wearing flexibility, and cannot be well applied to the petroleum and chemical, hazardous waste treatment, chemical accident and fire emergency rescue environments, and cannot meet the use requirements. SUMMARY

[0005] The present application provides a gas-tight chemical protective clothing fabric which can be worn in the petroleum and chemical, hazardous waste treatment, chemical accident and fire emergency rescue environments to protect the operators, and has good flame retardation, anti-static and wearing flexibility, so as to solve the problems of the existing chemical protective clothing.

[0006] In a first aspect, the present application provides a gas-tight chemical protective clothing fabric, and adopts the following technical scheme.

[0007] The gas-tight chemical protective clothing fabric comprises, from the outer layer to the inner layer, a chemical protective layer, a flame-retardant layer, an anti-static layer, a protective layer and a comfortable layer which are sequentially bonded.

[0008] The chemical protective layer and the protective layer are both dense high molecular films; the anti-static layer is a cloth embedded with carbon black conductive fibers; and the carbon black conductive fiber is a fiber in which carbonized fibers are embedded in poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene.

[0009] In the above scheme, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is a conductive polymer with good thermal stability. Phenoxy polyphosphazene is a flame-retardant polymer with certain conductivity. Carbonized fiber has good conductivity and thermal stability. By using the above technical scheme, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded in carbonized fiber, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene can both adsorb carbon particles, and phenoxy polyphosphazene has good toughness, so that the obtained carbon black conductive fiber has good toughness, bending resistance, and the carbon particles on the carbonized fiber are adsorbed and not easy to fall off, while maintaining excellent conductivity and heat resistance. The P and N alternating double bonds of phenoxy polyphosphazene can adsorb the sulfonic group and S on the thiophene ring of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), and phenoxy polyphosphazene is insoluble in water, so that the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) adsorbed by it is not easy to be de-embedded from the carbonized fiber under the impact of water. The above effects make the anti-static layer of the woven carbon black conductive fiber have good conductivity, and static electricity is easily conducted to the air, so that the anti-static layer has good anti-static property and is not easy to cause static accidents in petrochemical scenes. The fabric adopts the outer layer to the inner layer in turn bonded anti-chemical layer, flame-retardant layer, anti-static layer, protective layer and comfortable layer, and the anti-chemical layer and the protective layer can prevent liquid penetration and resist acid and alkali chemical corrosion. The fabric can be made into airtight anti-chemical clothing. The thickness of each layer of the fabric can be controlled at a low level, and the overall weight and hardness of the anti-chemical clothing are significantly lower than those of the same thickness of synthetic rubber chlorosulfonated polyethylene CSM. After wearing, it is flexible and comfortable, and the anti-chemical clothing can adapt to bending during normal operation without being easily damaged. The setting of the flame-retardant layer makes the anti-chemical clothing flame-retardant, and the anti-static layer has good toughness, bending resistance, and is not easy to fall off carbon powder, and is heat-resistant and has a long service life, which can effectively protect the safety of workers in petrochemical, hazardous waste treatment, chemical accident and fire emergency rescue environments.

[0010] A preferred scheme of the airtight anti-chemical clothing fabric is that the carbon black conductive fiber is carbonized fiber obtained by carbonizing a textile fiber, and then the carbonized fiber is soaked in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, the solvent of the solution is a mixture of water and tetrahydrofuran with a mass ratio of (60-80%):(20-40%), the soaking process is carried out under a gas pressure of 1-1.5 MPa and heated to 115-130°C for 1-2 h, then the carbonized fiber is taken out, washed and dried to obtain the carbon black conductive fiber.

[0011] By adopting the technical scheme, the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is soluble in water, the phenoxy polyphosphazene is insoluble in water but soluble in tetrahydrofuran, and a mixed solution of water and tetrahydrofuran with a mass ratio of (60-80%):(20-40%) is used as a solvent, so that the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and the phenoxy polyphosphazene can be both dissolved in the solvent, under the above pressurized and heated conditions, the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and the phenoxy polyphosphazene penetrate into the carbonized fiber, the phenoxy polyphosphazene is melted in the process, and after cooling, the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and the phenoxy polyphosphazene are not easy to be de-embedded from the carbonized fiber in a water environment and a high-temperature environment, so that the carbon black conductive fiber has stable toughness.

[0012] In the solution, the mass concentration of the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is 1-1.5%, and the mass concentration of the phenoxy polyphosphazene is 1-1.5%; the mass ratio of the carbonized fiber immersed and put into the solution is 1:(50-100).

[0013] By adopting the technical scheme, the carbonized fiber is fully embedded with the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and the phenoxy polyphosphazene, the toughness of the carbonized fiber is enhanced, and the carbon particles are adsorbed and not easy to fall off.

[0014] In the solution, the mass concentration of the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is 1-1.5%, and the mass concentration of the phenoxy polyphosphazene is 1-1.5%; the mass ratio of the carbonized fiber immersed and put into the solution is 1:(50-100).

[0015] By adopting the technical scheme, the fire-retardant silicone has good viscosity and fire retardation, and can resist fire burning and effectively protect the safety of the wearer in case of fire.

[0016] In the solution, the mass concentration of the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is 1-1.5%, and the mass concentration of the phenoxy polyphosphazene is 1-1.5%; the mass ratio of the carbonized fiber immersed and put into the solution is 1:(50-100).

[0017] By adopting the technical scheme, the high-density polyethylene film is waterproof and resistant to acid and alkali; the aramid fabric is light and soft, resistant to acid and alkali, has a high melting point and is difficult to burn, and can effectively resist high temperature, flame, electric arc and other operation hazards; the polytetrafluoroethylene film is resistant to acid and alkali, solvent corrosion, high temperature, fire, water and electric insulation; the viscose fabric is moisture-absorbing, breathable and not easy to generate static electricity, and is comfortable to wear. The above makes the fabric effectively protect the operation personnel.

[0018] In the solution, the mass concentration of the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is 1-1.5%, and the mass concentration of the phenoxy polyphosphazene is 1-1.5%; the mass ratio of the carbonized fiber immersed and put into the solution is 1:(50-100).

[0019] By adopting the technical scheme, the meta-aramid is slightly soft, the wearing comfort is good, the para-aramid has greater strength, the strength of the fabric is improved after doping, and the meta-aramid and the para-aramid are both heat-resistant and flame-retardant, and can maintain good strength in a high-temperature environment.

[0020] In an embodiment of the gas-tight chemical protective clothing fabric, the thickness of the chemical protective layer is 50-200 microns, the thickness of the flame-retardant layer is 0.2-0.5 mm, the yarn count of the antistatic layer is 50D*50D, the gram weight is 40-60 g / m2, the thickness of the protective layer is 0.2-0.5 mm, and the gram weight of the comfort layer is 100-150 g / m2. 2 2 2 2

[0021] By adopting the technical scheme, the comfort layer can be a non-woven fabric, the fabric is soft and comfortable, and the fabric has the properties of spacing, flame retardance, antistatic property, acid and alkali corrosion resistance, etc.

[0022] In a second aspect, the application further provides a preparation method of the gas-tight chemical protective clothing fabric, and the following technical scheme is adopted.

[0023] The preparation method of the gas-tight chemical protective clothing fabric comprises the following processes: coating an adhesive on the upper surface of the chemical protective layer, and adhering the lower surface of the flame-retardant layer to the upper surface of the chemical protective layer; coating an adhesive on the upper surface of the flame-retardant layer, and adhering the lower surface of the antistatic layer to the upper surface of the flame-retardant layer; coating an adhesive on the upper surface of the antistatic layer, and adhering the lower surface of the protective layer to the upper surface of the antistatic layer; coating an adhesive on the upper surface of the protective layer, and adhering the lower surface of the comfort layer to the upper surface of the protective layer to obtain a composite fabric; and hot-pressing the composite fabric to obtain the gas-tight chemical protective clothing fabric.

[0024] By adopting the technical scheme, the chemical protective layer prevents the penetration of chemical reagents, the flame-retardant layer prevents the invasion of fire, the antistatic layer discharges electric charges, the protective layer prevents the penetration of corrosive substances, and the comfort layer absorbs moisture and is breathable, and the fabric obtained by stacking these layers has the effects of comfort, flame retardance, antistatic property, and corrosion resistance.

[0025] ​​​​One preferred solution of the preparation method of the airtight chemical protective clothing fabric is that the antistatic layer is obtained by the following method: placing the textile fiber into a diammonium hydrogen phosphate solution with a temperature of 25-80 DEG C and a mass concentration of 5-20%, soaking for 1-5 min; then taking out the textile fiber, keeping it in an air atmosphere at 100-250 DEG C for 0.5-2 h to perform pre-oxidation; then keeping the pre-oxidized textile fiber in an oxygen-free atmosphere at 800-1200 DEG C for 1-1.5 h to perform carbonization, thereby obtaining the carbonized fiber.

[0026] Soaking the carbonized fiber into a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, so that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded into the carbonized fiber, then taking out the carbonized fiber, washing and drying to obtain the carbon black conductive fiber.

[0027] Mixing the carbon black conductive fiber and the woven fiber at a mass ratio of (1-5):100, then making yarns, and weaving the fabric with the yarns as warp and weft, the fabric serving as the antistatic layer.

[0028] By adopting the above technical solution, the textile fiber can be viscose fiber, etc., the diammonium hydrogen phosphate is infiltrated into the textile fiber, the combustion risk of the textile fiber in the pre-oxidation process is reduced, the carbonization porosity is improved, and the proportion of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene embedded into the carbonized fiber is increased. The textile fiber is pre-oxidized and carbonized first, the fiber is dispersed and not easy to be bonded, and the probability of fiber bonding in the carbonization process is reduced. In the carbonization process of the textile fiber, the water is evaporated, the organic matter is decomposed and volatilized, and a carbon organization structure is formed, which has good conductivity and heat resistance. The fabric prepared by mixing the carbon black conductive fiber and the woven fiber has good structure firmness and antistatic property. The woven fiber can be polyester, etc.

[0029] In summary, the airtight chemical protective clothing fabric and the preparation method thereof have the following beneficial effects: comfortable to wear, and having the properties of preventing chemical penetration, flame retardation, antistatic property, and corrosion resistance. The antistatic layer is a fabric embedded with carbon black conductive fiber, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded into the fiber, the toughness of the fiber is improved, the fiber is resistant to bending and not easy to drop carbon powder, and the fiber has good conductivity and heat resistance, so that the chemical protective clothing prepared from the fabric is suitable for the fields such as petroleum and chemical industry which have high requirements on antistatic property. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the layer structure of the airtight chemical protective clothing fabric.

[0031] Reference numerals: 1, chemical protective layer; 2, flame retardant layer; 3, antistatic layer; 4, protective layer; 5, comfort layer. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the following embodiments, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0033] The flame-retardant silica gel used in the following examples and comparative examples is supplied by Shenzhen Xindonghao Electronic Technology Co., Ltd. and has a model number of TSE3941-W.

[0034] Example 1 This embodiment prepares a gas-tight chemical protective clothing fabric, such as Figure 1 The fabric includes, from the outer layer to the inner layer, a chemical protective layer 1, a flame retardant layer 2, an antistatic layer 3, a protective layer 4, and a comfort layer 5. The following is a description of the materials of each layer.

[0035] The chemical protective layer is a high-density polyethylene film with a thickness of 100 μm.

[0036] The flame retardant layer is aramid cloth, which contains 80% meta-aramid (aramid 1313) and 20% para-aramid (aramid 1414) by weight percentage. The aramid cloth has a thickness of 0.35 mm and a grammage of 100 g / m 2 .

[0037] The protective layer is a polytetrafluoroethylene film with a thickness of 0.35 mm and a grammage of 65 g / m 2 , which can prevent liquid penetration and resist acid and alkali chemical corrosion.

[0038] The comfort layer is viscose fabric with a grammage of 125 g / m 2 , which can effectively absorb surface moisture and sweat.

[0039] Preparation of the antistatic layer: (1) viscose fibers are put into a diammonium hydrogen phosphate solution with a mass concentration of 10% at a temperature of 50°C and soaked for 2 min; then the viscose fibers are taken out and kept in an air atmosphere at 175°C for 1 h for pre-oxidation; then the pre-oxidized viscose fibers are kept in a nitrogen atmosphere at 1000°C for 1.2 h for carbonization to obtain carbonized fibers. (2) The carbonized fibers are soaked into a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, the solvent of the solution being a mixture of water and tetrahydrofuran with a mass ratio of 70%:30, in the solution, the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) being 1.25% and the mass concentration of phenoxy polyphosphazene being 1.25%; the mass ratio of the carbonized fibers put into the solution to the solution being 1:75, the soaking process being carried out under an air pressure of 1.2 MPa and heating to 120°C for 1.5 h, so that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded into the carbonized fibers, then the carbonized fibers are taken out, washed and dried to obtain carbon black conductive fibers. (3) The carbon black conductive fibers and polyester are mixed with a mass ratio of 3:100, then yarns are prepared, the yarns being used as warp and weft to weave cloth, the cloth embedded with the carbon black conductive fibers being used as the antistatic layer. The yarn count of the antistatic layer is 50Dx50D, and the grammage is 50 g / m 2 .

[0040] The upper surface of the chemical protection layer is coated with an adhesive, and the lower surface of the flame-retardant layer is attached to the upper surface of the chemical protection layer; the upper surface of the flame-retardant layer is coated with an adhesive, and the lower surface of the antistatic layer is attached to the upper surface of the flame-retardant layer; the upper surface of the antistatic layer is coated with an adhesive, and the lower surface of the protective layer is attached to the upper surface of the antistatic layer; the upper surface of the protective layer is coated with an adhesive, and the lower surface of the comfort layer is attached to the upper surface of the protective layer, to obtain a composite fabric. The adhesive between the above layers is flame-retardant silicone, and the thickness is 100 μm. The composite fabric is hot-pressed, the hot-pressing temperature is 145°C, the hot-pressing pressure is 0.8 MPa, and the holding time is 90 s, and a gas-tight chemical protection suit fabric is obtained after hot-pressing.

[0041] Example 2 In this example, a gas-tight chemical protection suit fabric is prepared, which comprises, from the outer layer to the inner layer, a chemical protection layer, a flame-retardant layer, an antistatic layer, a protective layer and a comfort layer which are attached. The following is a description of the materials of each layer. Compared with Example 1, the parameters are adjusted in this example.

[0042] The chemical protection layer is a high-density polyethylene film with a thickness of 50 μm.

[0043] The flame-retardant layer is aramid cloth, in which meta-aramid (aramid 1313) accounts for 70% and para-aramid (aramid 1414) accounts for 30% by weight. The thickness of the aramid cloth is 0.2 mm, and the grammage is 50 g / m 2 .

[0044] The protective layer is a polytetrafluoroethylene film with a thickness of 0.2 mm and a weight of 50 g / m 2 , which can prevent liquid penetration and resist acid and alkali chemical corrosion.

[0045] The comfort layer is a viscose fabric with a weight of 100 g / m 2 , which can effectively absorb surface moisture and sweat.

[0046] Preparation of the antistatic layer: (1) The viscose fiber is immersed in a diammonium hydrogen phosphate solution with a mass concentration of 5% at a temperature of 25°C for 0.5 min; then the viscose fiber is taken out and kept in an air atmosphere at 100°C for 0.5 h for pre-oxidation; then the pre-oxidized viscose fiber is kept in a nitrogen atmosphere at 800°C for 1 h for carbonization, obtaining carbonized fiber. (2) The carbonized fiber is immersed in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, the solvent of the solution being a mixture of water and tetrahydrofuran with a mass ratio of 60:40, in the solution, the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) being 1%, and the mass concentration of phenoxy polyphosphazene being 1.5%; the mass ratio of the immersed carbonized fiber to the solution being 1:50, the soaking process being under an air pressure of 1 MPa and heating to 115°C for 1 h, so that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded in the carbonized fiber; then the carbonized fiber is taken out, washed and dried to obtain carbon black conductive fiber. (3) The carbon black conductive fiber and polyester are mixed in a mass ratio of 1:100, then yarn is made, and the yarn is used as warp and weft to weave cloth, and the cloth embedded with carbon black conductive fiber is used as the antistatic layer. The yarn count of the antistatic layer is 50Dx50D, and the weight is 40 g / m 2 .

[0047] The upper surface of the chemical protection layer is coated with an adhesive, and the lower surface of the flame retardant layer is attached to the upper surface of the chemical protection layer; the upper surface of the flame retardant layer is coated with an adhesive, and the lower surface of the antistatic layer is attached to the upper surface of the flame retardant layer; the upper surface of the antistatic layer is coated with an adhesive, and the lower surface of the protective layer is attached to the upper surface of the antistatic layer; the upper surface of the protective layer is coated with an adhesive, and the lower surface of the comfort layer is attached to the upper surface of the protective layer, obtaining a composite fabric. The adhesive between each layer is flame-retardant silicone with a thickness of 50 μm. The composite fabric is hot-pressed at a temperature of 130°C and a pressure of 0.3 MPa for 60 s, and a gas-tight chemical protection clothing fabric is obtained after hot-pressing.

[0048] Example 3 The embodiment prepares a gas-tight chemical protective clothing fabric, which comprises a chemical protective layer, a flame-retardant layer, an antistatic layer, a protective layer and a comfortable layer which are sequentially adhered from the outer layer to the inner layer. The following is the description of the materials of each layer. Compared with the embodiment 1, the embodiment adjusts the parameters.

[0049] The chemical protective layer is a high-density polyethylene film with a thickness of 200 μm.

[0050] The flame-retardant layer is aramid cloth, in which meta-aramid (aramid 1313) accounts for 90% and para-aramid (aramid 1414) accounts for 10% by weight. The aramid cloth has a thickness of 0.5 mm and a weight of 150 g / m 2 .

[0051] The protective layer is a polytetrafluoroethylene film with a thickness of 0.5 mm and a weight of 80 g / m 2 , which can prevent liquid penetration and resist acid and alkali chemical corrosion.

[0052] The comfortable layer is viscose fabric with a weight of 150 g / m 2 , which can effectively absorb surface moisture and sweat.

[0053] The antistatic layer is prepared as follows: (1) viscose fibers are put into a diammonium hydrogen phosphate solution with a temperature of 80 °C and a mass concentration of 20% for 4 min, then taken out and kept in an air atmosphere at 250 °C for 2 h for pre-oxidation, and then kept in a nitrogen atmosphere at 1200 °C for 1.5 h for carbonization to obtain carbonized fibers; (2) the carbonized fibers are soaked in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, in which the solution solvent is a mixture of water and tetrahydrofuran with a mass ratio of 80%:20%, the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) in the solution is 1.5%, and the mass concentration of phenoxy polyphosphazene in the solution is 1%; the mass ratio of the carbonized fibers to the solution is 1:100, the soaking process is carried out under an air pressure of 1.5 MPa and heating to 130 °C for 2 h, so that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded into the carbonized fibers, then the carbonized fibers are taken out, washed and dried to obtain carbon black conductive fibers; (3) the carbon black conductive fibers and polyester are mixed in a mass ratio of 5:100, then yarn is prepared, and the yarn is used as warp and weft to weave cloth, and the cloth embedded with the carbon black conductive fibers is used as the antistatic layer. The yarn count of the antistatic layer is 50D x 50D, and the weight is 60 g / m 2 .

[0054] The upper surface of the chemical protective layer is coated with an adhesive, and the lower surface of the flame-retardant layer is attached to the upper surface of the chemical protective layer; the upper surface of the flame-retardant layer is coated with an adhesive, and the lower surface of the antistatic layer is attached to the upper surface of the flame-retardant layer; the upper surface of the antistatic layer is coated with an adhesive, and the lower surface of the protective layer is attached to the upper surface of the antistatic layer; the upper surface of the protective layer is coated with an adhesive, and the lower surface of the comfort layer is attached to the upper surface of the protective layer, to obtain a composite fabric. The adhesive between the above layers is a flame-retardant silicone with a thickness of 200 μm. The composite fabric is hot-pressed at a temperature of 160°C, a pressure of 1.2 MPa, and a holding time of 120 s, and a gas-tight chemical protective fabric is obtained after hot-pressing.

[0055] Comparative Example 1 A gas-tight chemical protective fabric is prepared in this comparative example, which differs from Example 1 only in that the (2) step of preparing the antistatic layer is changed to immersion at normal pressure and a lower temperature.

[0056] In the (2) step of preparing the antistatic layer, the carbonized fiber is immersed in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, the solvent of the solution is a mixture of water and tetrahydrofuran with a mass ratio of 70:30, the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) in the solution is 1.25%, and the mass concentration of phenoxy polyphosphazene is 1.25%; the mass ratio of the carbonized fiber to the solution is 1:75, the immersion is carried out at normal pressure, and the solution is heated to 60°C for 1.5 h, so that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are attached to the surface of the carbonized fiber; then the carbonized fiber is taken out, washed and dried to obtain a carbon black conductive fiber.

[0057] Comparative Example 2 A gas-tight chemical protective fabric is prepared in this comparative example, which differs from Example 1 only in that the (2) step of preparing the antistatic layer does not use poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), but only uses phenoxy polyphosphazene.

[0058] In the (2) step of preparing the antistatic layer, the carbonized fiber is immersed in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, the solvent of the solution is a mixture of water and tetrahydrofuran with a mass ratio of 70:30, the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) in the solution is 1.25%, and the mass concentration of phenoxy polyphosphazene is 1.25%; the mass ratio of the carbonized fiber to the solution is 1:75, the immersion is carried out at normal pressure, and the solution is heated to 60°C for 1.5 h, so that poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are attached to the surface of the carbonized fiber; then the carbonized fiber is taken out, washed and dried to obtain a carbon black conductive fiber.

[0059] Comparative Example 3 A gas-tight chemical protective clothing fabric was prepared in this comparative example, which was different from Example 1 only in that the step (2) of preparing the antistatic layer did not use phenoxy polyphosphazene but only used poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid).

[0060] The step (2) of preparing the antistatic layer in this comparative example was that the carbonized fiber was soaked in a poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) solution, the solvent of the solution was a mixture of water and tetrahydrofuran with a mass ratio of 70:30, and the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) in the solution was 2.5%; the mass ratio of the carbonized fiber to be soaked and the solution was 1:75, the soaking process was carried out under an air pressure of 1.2 MPa and heating to 120°C for 1.5 h to make poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) intercalate into the carbonized fiber, and then the carbonized fiber was taken out, washed and dried to obtain carbon black conductive fiber.

[0061] Comparative Example 4 A gas-tight chemical protective clothing fabric was prepared in this comparative example, which was different from Example 1 only in that the carbonized fiber was not soaked in poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene when preparing the antistatic layer, i.e. the step (2) of preparing the antistatic layer was cancelled, and the carbonized fiber obtained in the step (1) of preparing the antistatic layer was directly put into the step (3), i.e. the carbonized fiber and polyester were mixed with a mass ratio of 3:100, then yarn was prepared, and the fabric was woven with the yarn as warp and weft, and the fabric interwoven with the carbonized fiber was used as the antistatic layer. The yarn count of the antistatic layer was 50Dx50D, and the grammage was 50 g / m 2 .

[0062] Test Example 1 The gas-tight chemical protective clothing fabrics of Examples 1-3 and Comparative Examples 1-4 were subjected to electrostatic test, including measuring the surface resistivity of the fabric, referring to the standard GB / T 12703.4-2010 (resistivity test), and measuring the induced voltage and half-life of the fabric, referring to FZ / T 01042-1996 “Determination of Electrostatic Performance of Textile Materials: Induced Voltage and Half-life of Electrostatic Voltage”. The results are shown in Table 1.

[0063] Table 1 Electrostatic test data The surface resistivity, induced voltage and half-life reflect the electrostatic generation and leakage capacity of the fabric. The surface resistivity, induced voltage and half-life of the fabrics of Examples 1-3 are lower than those of Comparative Examples 1-4, indicating that the conductive performance of the fabrics of Examples 1-3 is better, the induced voltage generated is smaller, the half-life is shorter, and the static electricity can be discharged more quickly.

[0064] Test Example 2 The anti-static layers of Examples 1-3 and Comparative Examples 1-4 were subjected to the powder drop test according to GB / T 20810-2018, and the results are shown in Table 2.

[0065] Table 2 Powder drop test Dust loss rate Example 1 0.01％ Example 2 0.01％ Example 3 0.01％ Comparative Example 1 0.15％ Comparative Example 2 0.01％ Comparative Example 3 0.04％ Comparative Example 4 0.08％ The results in Table 2 show that the anti-static layers prepared in Examples 1-3 and Comparative Example 2 are not prone to powder drop, and the anti-static layer prepared in Comparative Example 4 is slightly prone to powder drop, because the phenoxy polyphosphazene penetrates into the carbonized fibers and binds the fibers and is not easily detached, and the phenoxy polyphosphazene also adsorbs the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid), so that the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is also not easily detached from the carbonized fibers, while the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) alone is easily detached from the carbonized fibers. Comparative Example 1 is severely prone to powder drop, because the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and the phenoxy polyphosphazene are only attached to the surface of the carbonized fibers and do not penetrate into the interior of the carbonized fibers, and thus are easily detached. Comparative Example 4 is also severely prone to powder drop, because the carbonized fibers themselves are unstable in structure, and the carbon particles on the fibers are easily detached.

[0066] The chemical protective clothing fabric prepared in the examples has the characteristics of preventing chemical penetration, flame retardation, acid and alkali corrosion resistance, antistatic, lightness, and wearing comfort, and is more suitable for various work scenes such as petrochemical industry than some common chemical protective clothing.

[0067] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An airtight chemical protective clothing fabric, characterized in that, It includes a chemical-resistant layer, a flame-retardant layer, an antistatic layer, a protective layer, and a comfort layer, which are bonded together sequentially from the outermost layer to the innermost layer; Both the chemical-resistant layer and the protective layer are dense polymer films; the antistatic layer is a fabric inlaid with carbon black conductive fibers; the carbon black conductive fibers are carbonized fibers embedded with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene.

2. The airtight chemical protective clothing fabric according to claim 1, characterized in that, The carbon black conductive fiber is obtained by carbonizing textile fibers, and then soaking the carbonized fibers in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene. The solvent of the solution is a mixture of water and tetrahydrofuran with a mass ratio of (60-80%):(20-40%). During the soaking process, the pressure is increased to 1-1.5 MPa and the temperature is heated to 115-130℃ and maintained for 1-2 hours. Then the carbonized fibers are taken out, washed and dried to obtain the carbon black conductive fiber.

3. The airtight chemical protective clothing fabric according to claim 2, characterized in that, In the solution, the mass concentration of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) is 1-1.5%, and the mass concentration of phenoxy polyphosphazene is 1-1.5%; the mass ratio of the carbonized fiber to the solution is 1:(50-100).

4. The airtight chemical protective clothing fabric according to claim 1, characterized in that, Flame-retardant silicone is used as an adhesive to bond adjacent layers.

5. The airtight chemical protective clothing fabric according to claim 1, characterized in that, The chemical-resistant layer is a high-density polyethylene film; the flame-retardant layer is aramid fabric; the protective layer is a polytetrafluoroethylene film; and the comfort layer is viscose fiber fabric.

6. The airtight chemical protective clothing fabric according to claim 5, characterized in that, The composition of the aramid fabric by weight percentage is as follows: meta-aramid accounts for 70% to 90%, and para-aramid accounts for 10% to 30%.

7. The airtight chemical protective clothing fabric according to claim 5, characterized in that, The thickness of the chemical-resistant layer is 50μm~200μm; the thickness of the flame-retardant layer is 0.2mm~0.5mm; the yarn count of the antistatic layer is 50D×50D, and the basis weight is 40g / m². 2 ~60g / m 2 The protective layer has a thickness of 0.2mm to 0.5mm; the comfort layer has a weight of 100g / m³. 2 ~150g / m 2 .

8. A method for preparing an airtight chemical protective clothing fabric as described in any one of claims 1-7, characterized in that, The process includes the following: An adhesive is applied to the upper surface of the chemical protective layer, and the lower surface of the flame retardant layer is attached to the upper surface of the chemical protective layer; an adhesive is applied to the upper surface of the flame retardant layer, and the lower surface of the antistatic layer is attached to the upper surface of the flame retardant layer. An adhesive is applied to the upper surface of the antistatic layer, and the lower surface of the protective layer is attached to the upper surface of the antistatic layer; an adhesive is applied to the upper surface of the protective layer, and the lower surface of the comfort layer is attached to the upper surface of the protective layer to obtain a composite fabric; the composite fabric is then hot-pressed to obtain the airtight chemical protective clothing fabric.

9. The method for preparing the airtight chemical protective clothing fabric according to claim 8, characterized in that, The antistatic layer is obtained in the following manner: The textile fibers are immersed in a diammonium hydrogen phosphate solution at a temperature of 25-80℃ and a mass concentration of 5-20% for 0.5-4 minutes; then the textile fibers are removed and kept in an air atmosphere at 100-250℃ for 0.5-2 hours for pre-oxidation; then the pre-oxidized textile fibers are kept in an oxygen-free atmosphere at 800-1200℃ for 1-1.5 hours for carbonization to obtain the carbonized fibers. The carbonized fiber is immersed in a solution containing poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene, so that the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic acid) and phenoxy polyphosphazene are embedded in the carbonized fiber. Then the carbonized fiber is removed, washed, and dried to obtain the carbon black conductive fiber. The carbon black conductive fiber and the weaving fiber are mixed at a mass ratio of (1-5):100 and then made into yarn. The yarn is used as the warp and weft to weave a fabric, which serves as the antistatic layer.

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