Airtight chemical protective clothing fabric and application method thereof

Abstract

The present application relates to the field of protective clothing fabrics, and specifically discloses an airtight chemical protective clothing fabric and an application method thereof; an airtight chemical protective clothing fabric, which comprises, from the outside to the inside, an outer layer, an intermediate barrier layer, an intermediate base fabric layer and an inner barrier layer, wherein the intermediate barrier layer comprises a polyvinyl chloride layer, a polyethylene layer and a polypropylene layer, the intermediate base fabric layer is an aramid base fabric layer, and the inner barrier layer comprises a polytetrafluoroethylene layer and a polypropylene layer; the present application utilizes a multi-layer structure to provide multiple protections for protective clothing, inhibit the penetration of chemical substances, and improve the barrier performance and corrosion resistance of protective clothing.

Description

Technical Field

[0001] The present application relates to the field of protective clothing fabrics, and in particular to an airtight chemical protective clothing fabric and an application method thereof. Background Art

[0002] Protective clothing, also known as chemical protective clothing, is worn to protect against hazardous chemicals or corrosive substances. It covers most of the body and can effectively protect the torso, arms, or thighs. In recent years, demand for protective clothing has been growing in the healthcare, chemical production, microbiology laboratories, petroleum and petrochemical industries, nuclear industry, and emergency firefighting sectors.

[0003] Most existing chemical protective suits are made of imported materials and have the following defects: first, the protective suits are bulky and inconvenient to carry and use; second, the material has poor chemical resistance and cannot meet the protection requirements well, especially in preventing the penetration of toxic and harmful gases; third, the rubber products used have poor aging resistance and are prone to aging and cracking, which greatly reduces the airtightness. Summary of the Invention

[0004] In order to improve the deficiencies of existing protective clothing, the present application provides an airtight chemical protective clothing fabric and an application method thereof.

[0005] In a first aspect, the present application provides an airtight chemical protective clothing fabric, which adopts the following technical solution:

[0006] A fabric for airtight chemical protective clothing comprises, from the outside to the inside, an outer layer, an intermediate barrier layer, an intermediate base fabric layer and an inner barrier layer. The intermediate barrier layer comprises a polyvinyl chloride layer, a polyethylene layer and a polypropylene layer. The intermediate base fabric layer is an aramid base fabric layer. The inner barrier layer comprises a polytetrafluoroethylene layer and a polypropylene layer.

[0007] By adopting the above technical solution, the outer layer resists chemical contamination, while the intermediate barrier layer, bonded to the outer layer, blocks the penetration of toxic gases. The intermediate barrier layer, composed of polyvinyl chloride, polyethylene, and polypropylene layers, blocks toxic and harmful gases and highly corrosive chemicals, improving the barrier, corrosion resistance, and flame retardancy of the protective suit. The intermediate base fabric layer, bonded to the intermediate barrier layer, leverages the structural support of the barrier material within the intermediate barrier layer, providing superior mechanical strength, barrier effectiveness, and flame retardancy. The inner barrier layer prevents damage to the intermediate barrier layer, providing dual protection against chemical penetration and providing added safety for the wearer. The multi-layer structure improves the poor chemical resistance of existing single-layer protective suits, while utilizing the inner barrier layer to address the aging and brittleness of protective suits, providing a double layer of security. The multi-layer composite structure also maintains the overall lightweight of the protective suit, achieving lightweighting while maintaining performance, improving safety and protective performance.

[0008] Preferably, the aramid base fabric layer is an aramid base fabric, the aramid base fabric is one of woven fabric, knitted fabric, and non-woven fabric, the thickness of the aramid base fabric is 0.1-0.3 mm, and the gram weight of the aramid base fabric is 50 g / m 2 -100g / m 2 .

[0009] By adopting the above technical solution, the aramid base fabric layer has the effects of wear resistance and tear resistance, and has certain flame retardant and corrosion resistance properties, thereby improving the resistance of the protective clothing to chemical substances.

[0010] Preferably, the thickness of the polyvinyl chloride layer is 50-500 μm, and the thickness of the polyethylene layer is 25-300 μm.

[0011] Preferably, the polypropylene layer is a polypropylene non-woven fabric, and the thickness of the polypropylene non-woven fabric is 25-300 μm; the polytetrafluoroethylene layer is a microporous membrane, and the thickness of the polytetrafluoroethylene layer is 10-500 μm.

[0012] By adopting the above technical solution, the microporous structure of the polytetrafluoroethylene microporous membrane is uniform and the pore size is small, which can effectively prevent the penetration of chemical liquids, thereby improving the barrier performance and chemical corrosion resistance of the protective clothing.

[0013] Preferably, the outer layer is silica gel, and the thickness of the outer layer is 50-500 μm.

[0014] Preferably, the viscosity of the silica gel is 20,000-40,000 mPa.s.

[0015] Preferably, the silica gel is pre-grafted with polymethyl methacrylate.

[0016] By adopting the above technical solution and pre-grafting silicone with polymethyl methacrylate, the heat resistance and chemical stability of silicone can be improved, and the barrier properties and chemical corrosion resistance of the protective clothing can be further improved.

[0017] Preferably, the polymethyl methacrylate raw material includes 3-mercaptopropyltrimethoxysilane and methyl methacrylate; the grafting method includes the following specific steps: mixing methyl methacrylate with a solvent, then adding 3-mercaptopropyltrimethoxysilane and mixing, stirring evenly, heating to 65-75°C under the protection of nitrogen, adding an initiator, keeping the temperature to react, washing, filtering, and drying to obtain polymethyl methacrylate; mixing silica gel with toluene, then adding polymethyl methacrylate, heating to 90-100°C, filtering after reaction, and drying to obtain the grafted modified silica gel.

[0018] By adopting the above technical solution, polymethyl methacrylate made from 3-mercaptopropyltrimethoxysilane and methyl methacrylate has good chemical stability, better stability and durability in chemical environment, can resist the erosion of various chemical substances, and improve the barrier properties and chemical corrosion resistance of protective clothing.

[0019] In a second aspect, the present application provides an application method for airtight chemical protective clothing fabrics, which adopts the following technical solutions:

[0020] A method for applying airtight chemical protective clothing fabrics includes the following specific steps:

[0021] The polyethylene layer is laminated with a polypropylene layer and a polyvinyl chloride layer on both sides to form an intermediate barrier layer. One side of the polypropylene layer in the intermediate barrier layer is hot-pressed and glued to the intermediate base fabric layer at a gluing temperature of 60-80°C and a hot-pressing time of 3-15 seconds. The polytetrafluoroethylene layer is hot-pressed and glued to the polypropylene layer at a gluing temperature of 60-120°C and a hot-pressing time of 2-10 seconds to form an inner barrier layer. One side of the polytetrafluoroethylene in the inner barrier layer is hot-pressed and glued to the intermediate base fabric layer. A silicone coating is then applied to the surface of the polyvinyl chloride layer in the intermediate barrier layer to form an outer layer, thereby producing an airtight chemical protective clothing fabric.

[0022] The airtight chemical protective clothing fabric is sewn to form an integrated protective clothing, which includes a hood, a jumpsuit and boot covers.

[0023] By adopting the above technical solution and through multi-layer structure composite, the penetration of chemical substances can be prevented while maintaining the overall light weight of the protective clothing, thereby providing the protective clothing with better barrier properties and chemical corrosion resistance.

[0024] Preferably, the seams of the one-piece protective clothing are hot-pressed with polyvinyl chloride strips, the hot-pressing temperature is 200-300° C., and the pressure is 0.2-0.6 MPa.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. The present invention utilizes a multi-layered structure to enhance the protective performance of existing protective clothing. The combination of an intermediate barrier layer and an outer layer provides dual protection against chemical contamination and toxic gas penetration, improving the protective clothing's barrier and corrosion resistance. The intermediate base fabric layer is bonded to the intermediate barrier layer, providing superior strength and barrier properties. The inner barrier layer prevents damage to the intermediate barrier layer, providing dual protection against chemical penetration and providing added safety for the wearer.

[0027] 2. This application utilizes a protective silicone layer made of vinyl silicone as the outermost layer of the protective suit, effectively resisting contamination from chemicals and maintaining excellent chemical corrosion resistance and durability. Furthermore, cross-linking the silicone resin with acrylic acid, butyl acrylate, and methyl methacrylate enhances the adhesion and film-forming properties of the silicone outer layer, improving the barrier properties and durability of the protective suit. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the embodiments.

[0029] All raw materials in the examples are commercially available.

[0030] Example

[0031] Example 1

[0032] This embodiment provides a barrier layer comprising, from the outside to the inside, an outer layer, an intermediate barrier layer, an intermediate base fabric layer, and an inner barrier layer. The intermediate barrier layer comprises, in sequence, a polyvinyl chloride layer, a polyethylene layer, and a polypropylene layer. The intermediate base fabric layer is an aramid base fabric layer. The aramid base fabric layer is an aramid base fabric. The aramid base fabric is a knitted fabric. The average thickness of the aramid base fabric is 0.2 mm, and the aramid weight is 80 g / m 2 The inner barrier layer comprises a polytetrafluoroethylene layer and a polypropylene layer. The adhesive used in this example is Henkel PUR7505 hot melt adhesive. The polypropylene layer is a polypropylene non-woven fabric purchased from Yanshan Petrochemical with an average thickness of 200 μm. The polytetrafluoroethylene layer is a microporous membrane with a pore size of 0.3 μm and an average thickness of 250 μm.

[0033] This embodiment provides an application method of airtight chemical protective clothing fabric, including the following specific steps:

[0034] S1: Polyvinyl chloride (PVC) and polyethylene (PE) are cast into films and compounded separately. The CAS number of PVC is 25702-80-1, and the CAS number of PE is 9002-88-4. A PVC layer with an average thickness of 250 μm and a polyethylene layer with an average thickness of 170 μm are formed. The polyethylene layer and the polypropylene layer are bonded with hot melt adhesive at a coating and lamination temperature of 110°C and a hot pressing time of 10 seconds to form an intermediate barrier layer.

[0035] S2: Hot-press and glue one side of the polypropylene layer in the middle barrier layer to the middle base fabric layer at a gluing temperature of 80°C and a hot-pressing time of 10s; hot-press and glue the polytetrafluoroethylene layer to the polypropylene layer at a gluing temperature of 110°C and a hot-pressing time of 8s to form an inner barrier layer; hot-press and glue one side of the polytetrafluoroethylene in the inner barrier layer to the middle base fabric layer at a gluing temperature of 110°C and a hot-pressing time of 10s; and then apply a layer of silicone coating on the surface of the polyvinyl chloride layer in the middle barrier layer. The silicone viscosity is 20,000 mPa.s. After heating and curing, an outer layer with an average thickness of 250 μm is formed to obtain an airtight chemical protective clothing fabric.

[0036] S3: The airtight chemical protective clothing fabrics prepared above are sewn to form an integrated protective clothing, which includes a hood, a jumpsuit and boot covers. Polyvinyl chloride strips are hot-pressed and glued at the seams. The hot-pressing temperature is 250°C, the pressure is 0.4 MPa, and the gluing speed is 3 m / s to form polyvinyl chloride strips with a width of 17 mm and a thickness of 130 μm.

[0037] Example 2

[0038] Example 2 provides an application method for airtight chemical protective clothing fabric, comprising the following specific steps:

[0039] S1: Polyvinyl chloride (PVC) and polyethylene (PE) are cast into films and compounded separately. The CAS number of PVC is 25702-80-1, and the CAS number of PE is 9002-88-4. A PVC layer with an average thickness of 50 μm and a polyethylene layer with an average thickness of 300 μm are formed. The polyethylene layer and the polypropylene layer are bonded with hot melt adhesive at a coating and lamination temperature of 110°C and a hot pressing time of 10 seconds to form an intermediate barrier layer.

[0040] S2: Hot-press and glue one side of the polypropylene layer in the middle barrier layer to the middle base fabric layer at a gluing temperature of 80°C and a hot-pressing time of 10s; hot-press and glue the polytetrafluoroethylene layer to the polypropylene layer at a gluing temperature of 110°C and a hot-pressing time of 8s to form an inner barrier layer; hot-press and glue one side of the polytetrafluoroethylene in the inner barrier layer to the middle base fabric layer at a gluing temperature of 110°C and a hot-pressing time of 10s; and then apply a layer of silicone coating on the surface of the polyvinyl chloride layer in the middle barrier layer. The silicone viscosity is 20,000 mPa.s. After heating and curing, an outer layer with an average thickness of 250 μm is formed to obtain an airtight chemical protective clothing fabric.

[0041] S3: The airtight chemical protective clothing fabrics prepared above are sewn to form an integrated protective clothing, which includes a hood, a jumpsuit and boot covers. Polyvinyl chloride strips are hot-pressed and glued at the seams. The hot-pressing temperature is 250°C, the pressure is 0.4 MPa, and the gluing speed is 3 m / s to form polyvinyl chloride strips with a width of 17 mm and a thickness of 130 μm.

[0042] Example 3

[0043] The difference between Example 3 and Example 1 is that the polytetrafluoroethylene layer is a microporous membrane with a pore size of 0.3 μm, the average thickness of the polytetrafluoroethylene layer is 10 μm, and the thickness of the polypropylene non-woven fabric in the polypropylene layer is 300 μm.

[0044] Example 4

[0045] The difference between Example 4 and Example 1 is that the polytetrafluoroethylene layer is a microporous membrane with a pore size of 0.3 μm, the average thickness of the polytetrafluoroethylene layer is 500 μm, and the thickness of the polypropylene non-woven fabric in the polypropylene layer is 25 μm.

[0046] Example 5

[0047] The difference between Example 5 and Example 1 is that the thickness of the outer surface layer is 50 μm.

[0048] Example 6

[0049] The difference between Example 6 and Example 1 is that the silica gel on the outer layer is pre-grafted with polymethyl methacrylate.

[0050] A method for applying airtight chemical protective clothing fabrics includes the following specific steps:

[0051] S1: Polyvinyl chloride (PVC) and polyethylene (PE) are cast into films and compounded separately. The CAS number of PVC is 25702-80-1, and the CAS number of PE is 9002-88-4. A PVC layer with an average thickness of 250 μm and a polyethylene layer with an average thickness of 170 μm are formed. The polyethylene layer and the polypropylene layer are bonded with hot melt adhesive at a coating and lamination temperature of 110°C and a hot pressing time of 10 seconds to form an intermediate barrier layer.

[0052] S2: Hot-press and glue one side of the polypropylene layer in the middle barrier layer to the middle base fabric layer at a gluing temperature of 80°C and a hot-pressing time of 10 seconds; hot-press and glue the polytetrafluoroethylene layer to the polypropylene layer at a gluing temperature of 110°C and a hot-pressing time of 8 seconds to form an inner barrier layer; hot-press and glue one side of the polytetrafluoroethylene in the inner barrier layer to the middle base fabric layer at a gluing temperature of 110°C and a hot-pressing time of 10 seconds.

[0053] S3: Mix silica gel and toluene, then add polymethyl methacrylate (CAS number 9011-14-7), the mass ratio of silica gel, toluene and polymethyl methacrylate is 1:25:1.5, heat to 95°C, react for 3 days, filter and dry to obtain grafted modified silica gel; then apply a layer of silica gel coating on the surface of the polyvinyl chloride layer of the middle barrier layer, heat and cure to form an outer layer with an average thickness of 250 μm, and prepare an airtight chemical protective clothing fabric.

[0054] S4: The airtight chemical protective clothing fabrics prepared above are sewn to form an integrated protective clothing, which includes a hood, a jumpsuit and boot covers. Polyvinyl chloride strips are hot-pressed and glued at the seams. The hot-pressing temperature is 250°C, the pressure is 0.4 MPa, and the gluing speed is 3 m / s to form polyvinyl chloride strips with a width of 17 mm and a thickness of 130 μm.

[0055] Example 7

[0056] The difference between Example 7 and Example 6 is that the polymethyl methacrylate raw material includes 3-mercaptopropyltrimethoxysilane and methyl methacrylate.

[0057] A method for applying airtight chemical protective clothing fabrics includes the following specific steps:

[0058] S1: Polyvinyl chloride (PVC) and polyethylene (PE) are cast into films and compounded separately. The CAS number of PVC is 25702-80-1, and the CAS number of PE is 9002-88-4. A PVC layer with an average thickness of 250 μm and a polyethylene layer with an average thickness of 170 μm are formed. The polyethylene layer and the polypropylene layer are bonded with hot melt adhesive at a coating and lamination temperature of 110°C and a hot pressing time of 10 seconds to form an intermediate barrier layer.

[0059] S2: Hot-press and glue one side of the polypropylene layer in the middle barrier layer to the middle base fabric layer at a gluing temperature of 80°C and a hot-pressing time of 10 seconds; hot-press and glue the polytetrafluoroethylene layer to the polypropylene layer at a gluing temperature of 110°C and a hot-pressing time of 8 seconds to form an inner barrier layer; hot-press and glue one side of the polytetrafluoroethylene in the inner barrier layer to the middle base fabric layer at a gluing temperature of 110°C and a hot-pressing time of 10 seconds.

[0060] S3: After mixing methyl methacrylate with anhydrous ethanol as the solvent, 3-mercaptopropyltrimethoxysilane was added. The mass ratio of methyl methacrylate, solvent, and 3-mercaptopropyltrimethoxysilane was 1:8:0.3. The mixture was stirred evenly. Under nitrogen protection, the temperature was raised to 70°C and an initiator was added. The mass ratio of initiator to methyl methacrylate was 0.01:1. The initiator was azobisisobutyronitrile. The reaction was kept warm for 24 hours. After washing, filtration, and drying, polymethyl methacrylate was obtained. Silica gel was mixed with toluene, and polymethyl methacrylate was added. The mass ratio of silica gel, toluene, and polymethyl methacrylate was 1:25:1.5. The mixture was heated to 95°C, reacted for 3 days, and then filtered and dried to obtain the grafted silica gel.

[0061] S4: A layer of silicone coating is then applied to the surface of the polyvinyl chloride layer of the middle barrier layer, and after heating and curing, an outer layer with an average thickness of 250 μm is formed to obtain an airtight chemical protective clothing fabric.

[0062] S5: The airtight chemical protective clothing fabrics prepared above are sewn to form an integrated protective clothing, which includes a hood, a jumpsuit and boot covers. Polyvinyl chloride strips are hot-pressed and glued at the seams. The hot-pressing temperature is 250°C, the pressure is 0.4 MPa, and the gluing speed is 3 m / s to form polyvinyl chloride strips with a width of 17 mm and a thickness of 130 μm.

[0063] Comparative Example

[0064] Comparative Example 1

[0065] The difference between Comparative Example 1 and Example 1 is that no intermediate barrier layer is used in the fabric material of the airtight chemical protective clothing.

[0066] Comparative Example 2

[0067] The difference between Comparative Example 2 and Example 1 is that no intermediate barrier layer and inner barrier layer are used in the fabric material of the airtight chemical protective clothing.

[0068] Performance testing

[0069] The one-piece protective clothing made of the airtight chemical protective clothing fabrics provided in Examples 1-7 and Comparative Examples 1-2 of the present application weighed less than 4.1 kg and was subjected to the following performance tests. The specific test results are shown in Table 1.

[0070] Detection method

[0071] 1. Chemical resistance

[0072] With reference to the standard GB / T 23462-2009 "Test method for chemical penetration of protective clothing", the anti-chemical penetration time of the one-piece protective clothing prepared in this application was tested at concentrations of 30%, 80%, and 600% sulfuric acid and 6.1 mol / L sodium hydroxide.

[0073] 2. Flame retardant properties

[0074] The flame retardant properties of the one-piece protective clothing prepared in this application were tested with reference to the standard of GB / T 5455-1997 "Textiles - Flammability Test - Vertical Method".

[0075] 3. High temperature aging resistance

[0076] The one-piece protective clothing sample prepared in this application was placed in an aging test chamber at 125°C for 24 hours, and the appearance of the protective clothing was observed.

[0077] Table 1: Performance test results data table

[0078]

[0079] Table 1: Performance test results data table

[0080]

[0081]

[0082] According to the performance test results, the protective clothing prepared in this application can effectively inhibit the penetration of chemicals and improve the chemical corrosion resistance, barrier properties and flame retardant effect of the protective clothing through multi-layer composite protection.

[0083] By comparing Comparative Examples 1-2 with Example 1, it can be seen that Comparative Example 1 does not use an intermediate barrier layer, and Comparative Example 2 does not use an intermediate barrier layer and an inner barrier layer. From the performance test results, it can be seen that the flame retardant effect of the protective clothing is significantly reduced, and the aging performance at high temperature is also reduced. Comparative Example 2 shows brittle cracking, which further illustrates that the combination of the inner barrier layer, the intermediate barrier layer and the intermediate base fabric layer can provide multiple protections for the protective clothing. Compared with traditional protection, the multi-layer protective clothing prepared in this application has better barrier effect and anti-aging performance.

[0084] 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 non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An airtight chemical protective clothing fabric, characterized in that: From the outside to the inside, they are the outer layer, the middle barrier layer, the middle base fabric layer and the inner barrier layer. The middle barrier layer includes a polyvinyl chloride layer, a polyethylene layer and a polypropylene layer, and the middle base fabric layer is an aramid base fabric layer; the inner barrier layer includes a polytetrafluoroethylene layer and a polypropylene layer, the polypropylene layer is a polypropylene non-woven fabric, and the polytetrafluoroethylene layer is a microporous membrane.

2. The airtight chemical protective clothing fabric according to claim 1, characterized in that: The aramid base fabric layer is an aramid base fabric, which is one of woven fabric, knitted fabric and non-woven fabric. The thickness of the aramid base fabric is 0.1-0.3 mm, and the gram weight of the aramid base fabric is 50 g / m 2 -100g / m 2 .

3. The airtight chemical protective clothing fabric according to claim 1, characterized in that: The thickness of the polyvinyl chloride layer is 50-500 μm, and the thickness of the polyethylene layer is 25-300 μm.

4. The airtight chemical protective clothing fabric according to claim 1, characterized in that: The thickness of the polypropylene non-woven fabric is 25-300 μm; the thickness of the polytetrafluoroethylene layer is 10-500 μm.

5. The airtight chemical protective clothing fabric according to claim 1, characterized in that: The outer layer is made of silica gel, and the thickness of the outer layer is 50-500 μm.

6. The airtight chemical protective clothing fabric according to claim 5, characterized in that: The viscosity of the silica gel is 20000-40000 mPa.s.

7. The airtight chemical protective clothing fabric according to claim 6, characterized in that: The silica gel is pre-grafted with polymethyl methacrylate.

8. The airtight chemical protective clothing fabric according to claim 7, characterized in that: The polymethyl methacrylate raw material includes 3-mercaptopropyltrimethoxysilane and methyl methacrylate; the grafting method includes the following specific steps: mixing methyl methacrylate with a solvent, then adding 3-mercaptopropyltrimethoxysilane and mixing, stirring evenly, heating to 65-75°C under the protection of nitrogen, adding an initiator, keeping the temperature to react, washing, filtering, and drying to obtain polymethyl methacrylate; mixing silica gel with toluene, then adding polymethyl methacrylate, heating to 90-100°C, filtering after reaction, and drying to obtain grafted modified silica gel.

9. A method for using the airtight chemical protective clothing fabric according to any one of claims 1 to 8, characterized in that: The specific steps include: The polyethylene layer is laminated with a polypropylene layer and a polyvinyl chloride layer on both sides to form an intermediate barrier layer. One side of the polypropylene layer in the intermediate barrier layer is hot-pressed and glued to the intermediate base fabric layer at a gluing temperature of 60-80°C and a hot-pressing time of 3-15 seconds. The polytetrafluoroethylene layer is hot-pressed and glued to the polypropylene layer at a gluing temperature of 60-120°C and a hot-pressing time of 2-10 seconds to form an inner barrier layer. One side of the polytetrafluoroethylene in the inner barrier layer is hot-pressed and glued to the intermediate base fabric layer. A silicone coating is then applied to the surface of the polyvinyl chloride layer in the intermediate barrier layer to form an outer layer, thereby producing an airtight chemical protective clothing fabric. The airtight chemical protective clothing fabric is sewn to form an integrated protective clothing, which includes a hood, a jumpsuit and boot covers.

10. The method for applying the airtight chemical protective clothing fabric according to claim 9, characterized in that: The seams of the one-piece protective clothing are glued with polyvinyl chloride strips by hot pressing, the hot pressing temperature is 200-300° C., and the pressure is 0.2-0.6 MPa.

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