47results about How to "Achieve flame retardancy" patented technology

The invention provides a high-strength stretch-proof flame-retardant textile. The flame-retardant textile is formed by weaving a flame-retardant composite yarn, wherein the flame-retardant composite yarn is formed by compounding a core yarn and a leather yarn and is one of a covering yarn and a fasciated yarn; the core yarn adopts a flame-retardant filament yarn as a raw material; the leather yarn adopts a flame-retardant short fiber as a raw material; and the weight ratio of the flame-retardant filament yarn to the flame-retardant short fiber is 30-90:10-70. Compared with the conventional flame-retardant textile, the high-strength stretch-proof flame-retardant textile has higher strength and overcomes the defects of difficult weaving, difficult dyeing and uncomfortableness of the high-strength fiber; the high-strength stretch-proof flame-retardant textile has permanent flame retardance which cannot decrease after the textile is washed, and better textile strength; the textile has soft and comfortable handfeel, rich color and good strength, meets the requirements of various flame-retardant clothes and related standards; the product has rich and varied appearances and is durable; and the combustion performance of the textile can meet the national standards of flame-retardant products.

The invention discloses high intumescent fire stopping mastic and a method for preparing the same. The mastic is prepared by taking acrylate emulsion (or elastic styrene-acrylate emulsion), polybutene (or polyisobutylene), glycol, emulsifying agent and tritolyl phosphate as base materials with addition of certain auxiliary materials. The preparation method is as follows: the base materials are added into a reaction kettle according to certain mass portion, stirred, slowly heated and insulated for a period of time, and transferred into a colloid stirrer; auxiliary materials such as ammonium polyphosphates, flame-retarding aluminum hydroxide, flame-retarding zinc borates, calcium carbonates, expandable graphite, iron oxide red and glass fibers are gradually added into the mixture under the condition of stirring; and the process of stirring is continued until a colloid is uniform. The fire stopping mastic prepared by adoption of the method can be quickly carbonized and expanded to 5 to 8 times of the prior volume in case of fire, and can not fall off; the strength and the heat insulation after solidification are good, and the fire resistance is very good; and the adhesion is strong and the elasticity is good. The high intumescent fire stopping mastic and the method are particularly suitable for fire compartmentation of various penetrating penetration assemblies such as cables, cable bridges, pipes and so on.

The invention provides a high-luster halogen-free flame-retardation antibiosis PP material and a manufacture method thereof. The high-luster halogen-free flame-retardation antibiosis PP material comprises the following components by weight part: 65-80 parts of polypropylene, 2-15 parts of mineral matter filling material, 10-30 parts of P-N halogen-free fire retardant, 3-10 parts of compatilizer, 0.1-1 part of nucleating agent, 0.2-1 part of degradation agent, 0.2-2 parts of lubricant, 0.1-0.4 parts of anti-oxidant, 0.1-0.3 parts of anti-dripping agent, 0.1-0.3 parts of antiseptic and 0.2 parts of light stabilizing agent. According to the invention, a high efficiency N-P nano composite flame retardation system is employed for halogen-free flame-retardation filling modification on a polypropylene material, is suitable for household electrical appliance case and bathroom equipment, and can reach the purposes of highlight halogen-free environmental protection flame retardation and antibiosis.

The invention discloses branching, cross-linking, expanded, melt-dropping-resistant and flame-retardant copolyester based on a triazine ring structure. The copolyester is prepared by conducting random copolymerization on structure units expressed as formulae I, II and III or structure units expressed as formulae I, II, III and IV according to a conventional method. The intrinsic viscosity [eta] of the prepared branching, cross-linking, expanded, melt-dropping-resistant and flame-retardant copolyester is 0.41-1.10 dL/g; the extreme oxygen index is 24.5-38.0%; the vertical combustion grade is between V-2 and V-0; the peak heat release rate p-HRR in a cone heat test is 247-643 kW/m<2>. According to the copolyester, a modified monomer of the triazine ring structure is introduced, and then copolymerized with polyester to form a unique ternary branched cross-linking network structure; the modified monomer of the triazine ring structure contains the flame-retardant element nitrogen, so that the melt viscosity of the copolyester in combustion can be improved; the copolyester is capable of releasing nitrogen and quickly forming an expanded char layer with excellent heat and oxygen insulation effects; especially, a phosphorus-nitrogen synergism effect can be generated when the copolyester is used together with the conventional phosphorus-containing flame-retardant agent; the flame-retardant performance and the melt-dropping-resistant effects can be more excellent; the selected monomer is low in price; the preparation process is mature; the operation is simple and convenient; the industrialized large-scale production is liable to implement.

The invention discloses a composite type kaolin flame-retardant foaming agent. The essentials of the technical scheme are as follows: the composite type kaolin flame-retardant foaming agent is prepared from kaolin powder, concave-convex rod argil powder having an air purification function, hydrogen peroxide, aluminium hydroxide, aliphatic alcohol polyoxyethylene ether sodium sulfate, superfine polyvinyl alcohol powder, dimethicone and water. A preparation method of the composite type kaolin flame-retardant foaming agent comprises the following steps of: firstly, stirring a composite type kaolin flame-retardant foaming agent paste-shaped ingredient into a paste; then stirring the composite type kaolin flame-retardant foaming agent ingredient into a finished product of the composite type kaolin flame-retardant foaming agent. After the composite type kaolin flame-retardant foaming agent is stirred at a high speed, porous foamed slurry is formed and the contact between combustible materials and air can be quickly isolated so as to fulfill the aims of flame retardance and extinguishment; by using a product produced by the composite type kaolin flame-retardant foaming agent, the effects of flame retardance, heat preservation, heat insulation and sound insulation are achieved, and a function of purifying the air is also realized; moreover, the composite type kaolin flame-retardant foaming agent is suitable for producing flame-retarding extinguishment products, light slabs, light wall bodies and sound-attenuating and noise-reducing products.

The invention provides compound modified asphalt concrete which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 3-7 parts of asphalt, 0.05-0.15 part of chlorinated polyethylene, 0.2-1.5 parts of aliphatic polyurethane resin, 0.075-1 part of serpentine, 0.15-1.5 parts of halloysite and 0.001-0.04 part of a coupling agent. The compound modified asphalt concrete provided by the invention is remarkably improved in noise reduction coefficient, has excellent pavement performance, is simple in preparation technology, has non-poisonous and harmless raw materials and has great social benefits for improving the pavement performance of asphalt and protecting the environment.

The invention provides a silicate modified polyurethane foam material, as well as a preparation method and an application method thereof, relates to a combination adopting an organic polymer compound as a base material, as well as a preparation method and an application method thereof, particularly relates to a combination adopting polyurethane as the base material, as well as a preparation method and an application method thereof, and aims to provide a silicate modified polyurethane foam material which is free from a foaming agent and an organic fire retardant, easy to get raw materials, low in reaction temperature, safe and stable, as well as a preparation method and an application method thereof. The foam material comprises a component A and a component B, wherein the component A comprises polyisocyanate and a toughening agent; the component B comprises a silicate aqueous solution, polyether glycol, a foam stabilizer and a catalyst. The foam material does not contain a foaming agent or an organic fire retardant, and is low in reaction temperature, safe and stable; the preparation method and the application method are simple and easy to operate; the foam material can be used in the fields of cavity filling of coal mine underground collapsed zones, gas prevention, air leakage prevention, airtightness, leakage stopping of water areas and the like.

The invention discloses a mica compound type flame retardant foaming agent. The technical scheme is characterized in that the mica compound type flame retardant foaming agent comprises sericite powder, attapulgite potter clay powder provided with an air purifying function, hydrogen peroxide, magnesium hydratefatty alcohol-polyoxyethylene ether sodium sulfate, superfine polyvinyl alcohol powder, simethicone and water. Paste ingredients of the mica compound type flame retardant foaming agent are stirred into the paste, and stirred into a finished product of the mica compound type flame retardant foaming agent. After the mica compound type flame retardant foaming agent is added with water and stirred at a high speed, porous foam slurry is formed, so that a combustible material can be isolated from being contacted with the air quickly, and flame retardance and extinguishment are achieved. A product produced by using the mica compound type flame retardant foaming agent has the flame retardance, thermal insulation and soundproof effects, as well as the air purifying function; and the mica compound type flame retardant foaming agent is suitable for producing a light board, a light wall body and products for flame retardance, extinguishment, and noise damping and reduction.

The invention belongs to the field of functional plastic alloy materials, and particularly relates to an antistatic low-smoke halogen-free flame-retardant PC/ABS alloy material and a preparation process thereof. The alloy material comprises the following components in parts by weight: 60-85 parts of PC, 48-60 parts of ABS, 0.5-2 parts of a flame retardant, 0.5-2 parts of an antistatic agent, 1-4 parts of a compatibilizer, 0.5-1 part of a coupling agent, 0.5-1 part of a dispersant, and 0.5-1 part of an antioxidant. According to the alloy material and the preparation process disclosed by the invention, specific flame retardant compounding systems are added, so that the product achieves the effects of low smoke and flame retardance while having good mechanical properties.

The invention discloses an environment-friendly multifunctional curtain fabric. The core technology is that the fabric has multiple functions such as thermal radiation protecting, fire resisting and fire extinguishing for escaping; the fabric is a double-sided fabric which is knitted by use of interlock stitch in knitting technologies. Stitch design and printing treatment can be performed on the front face of the fabric according to the requirements of patterns, and an almost transparent silicon resin is coated on the front face of the fabric by use of a coating technology so that the front face of the fabric has attractive appearance and the fire resisting function; the back face of the fabric is also coated with the silicon resin, silver or aluminum metal ions are sputtered to the internal surface of the resin film by use of the magnetron sputtering technology, and finally, the film is bonded with the fabric so that the back face of the fabric has the thermal radiation protecting and fire resisting functions; the fabric can be applied to extinguishing fire for escaping at critical moments. The environment-friendly multifunctional curtain fabric has the beneficial effects that the double-sided characteristic of the interlock stitch is achieved, so that in appearance, the stitch design and the printing treatment are performed, and in function, multiple functions of thermal radiation protecting, fire resisting and fire extinguishing for escaping are achieved, and therefore, the fabric has great practical significance for energy conservation and emission reduction, fire prevention and the like.

The invention discloses a pumice composite flame-retardant foaming agent. The technical scheme of the pumice composite flame-retardant foaming agent has the following key points that the pumice composite flame-retardant foaming agent is composed of pumice powder, attapulgite argil powder having an air purifying function, hydrogen peroxide, aluminium hydroxide, sodium polyoxyethylene fatty alcohol ether sulfate, superfine polyvinyl alcohol powder, simethicone and water; firstly, the paste raw materials of the pumice composite flame-retardant foaming agent are stirred into a paste at first and then the raw materials of the pumice composite flame-retardant foaming agent are stirred into the finished product of the pumice composite flame-retardant foaming agent. A product produced by using the pumice composite flame-retardant foaming agent has the effects of flame retarding, heat preservation, thermal insulation and sound insulation, and also has the air purifying function; and the pumice composite flame-retardant foaming agent is suitable for producing flame-retarding and fire-extinguishing products, light plates, light walls, and sound-attenuating and noise-reducing products.

The invention discloses a vermiculite mesh gel foam mud fire prevention and extinguishing agent. The key point of the technical scheme adopted by the invention lies in that the vermiculite mesh gel foam mud fire prevention and extinguishing agent is composed of a vermiculite composite flame retardant foaming agent, attapulgite pottery clay powder with an air purifying function, inorganic fiber spray coating cotton, expanded vermiculite powder, coal gangue powder, sodium alginate and water. The ingredients of the vermiculite mesh gel foam mud fire prevention and extinguishing agent are input into a rake type mixing machine to undergo high-speed stirring, thus obtaining the vermiculite mesh gel foam mud fire prevention and extinguishing agent. The mesh gel foam mud is sprayed to a burning coal layer by an inorganic fiber spray coating machine, thus facilitating generating an integral mesh gel foam mud film in a fire prevention and extinguishing process. The film can always cover and adhere to an ore bed surface to rapidly isolate the burning coal layer from air, prevent coal mine from keeping burning and avoid reburning of the coal layer, thus reaching the purposes of flame retardance and fire prevention and extinguishing. The vermiculite mesh gel foam mud fire prevention and extinguishing agent is suitable for fire prevention and extinguishing of coal mines, mine operation areas and forests.

The invention relates to the modification treatment field of a wood floor timber, and relates to a color preserving long-term modification treatment agent for the wood floor timber. The modification treatment agent comprises the following raw materials by weight: 1-2 parts of thiourea, 38-40 parts of urea, 12-15 parts of sodium chloride, 2-3 parts of wing nut leaf, 10-12 parts of potassium hydroxide, 0.5-1 part of walnut green husk, 8-10 parts of methyl methacrylate, 1-3 parts of sodium dodecyl sulfate, 5-6 parts of waste molasses, 380-400 parts of water and 6-8 parts of an additive; the modification treatment agent is environmentally-friendly, safe and free of volatile and toxic substances, the methyl methacrylate is used for simple and efficient extraction of bioactive ingredients in the walnut green husk and the wing nut leaf, and by combination of the thiourea, the urea, the sodium chloride and other raw materials, the modification treatment agent can efficiently penetrate into the timber, the modified timber is good in dimensional stability, waterproof, moistureproof, insect repellent, anticorrosive, and light in intensity of colour, and the wood floor prepared from the modified wood floor timber is more durable, and strong in market competitiveness compared with floor prepared from the same material.

The invention provides a lithium ion power battery and automobile using the same; the battery sequentially comprises an anode, a first separation membrane, a cathode, and a second separation membrane; the battery contains electrolyte; and the electrolyte contains anti-flaming substances. Due to the anti-flaming substances contained in the electrolyte, the anti-flaming performance of the battery is achieved by the addition of the anti-flaming substances, and these substances do not affect the normal reaction of between the anode and the cathode of the lithium ion power battery, do not affect the performance of the battery when the lithium ion power battery is normally recharged or discharged; when the lithium ion power battery is abused or in abnormality, the anti-flaming substances take effect of anti-flaming and prevent the lithium ion power battery from keeping discharging. Therefore, the passivation layer SEI membrane is prevented from being damaged; the temperature of the battery is prevented from continuously rising; the passivation layer SEI membrane is prevented from decomposing to generate hydrogen free-radical and hydroxyl radical, thus the lithium ion power battery cannot reach the temperature required for generating alkane hydrogen gas, thereby radically preventing the battery from burning or exploding.

The invention discloses an inclusion type low-smoke antimony-free flame retardant based on cucurbituril and an application of the inclusion type low-smoke antimony-free flame retardant. A preparationmethod based on the cucurbituril inclusion type low-smoke antimony-free flame retardant comprises the following steps: (1) dissolving cucurbituril in concentrated hydrochloric acid, heating until thecucurbituril is completely dissolved, adding the flame retardant, stirring until the cucurbituril is completely dissolved, reacting, stirring the solution with ethanol after the reaction, filtering toobtain a precipitate, washing the precipitate, and drying to obtain a precursor, so that a cucurbituril flame retardant inclusion compound solid is obtained, and (2) sequentially adding melamine or melamine urate, the cucurbituril flame retardant inclusion compound solid, metal hydroxide and zinc borate into a stirring container, stirring, heating to 80-110 DEG C, adding a silane coupling agent,and stirring to obtain the cucurbituril inclusion type low-smoke antimony-free flame retardant. The hydrophobic cucurbituril inclusion type low-smoke antimony-free flame retardant prepared by the invention is reasonable in proportion, high in uniformity, high in synergistic effect efficiency and excellent in flame retardant effect, and meanwhile, has a smoke suppression effect.

The invention relates to a preparation method of a flame-retardant stable polyurethane reinforcing material, and belongs to the technical field of reinforcing materials. According to the technical scheme of the invention, peat is taken as a raw material, a modifying material is extracted, and the surface of silica sol is subjected to grafting modification in order to realize surface grafting of nano-silica in a non-organic solvent. The surface of the silica sol can be further connected with various functional groups through grafting modification of a dispersible modifying material. Formed geldispersoid is effectively and organically dispersed inside a polyurethane material to form a three-dimensional crosslinked netlike structure, so that the mechanical performance of the polyurethane reinforcing material is improved. According to the technical scheme, prepared porous glass micro powder is coated with dispersed and modified gel, then the gel burns, and generated silicon dioxide ash forms a coating layer after high-temperature burning. Under the bonding and combustion-supporting actions of glass flow at a high temperature, an eutectic reaction is performed between the silicon dioxide and glass micro powder to generate a dense protection layer, so that the aim of resisting flame and fire is fulfilled.

The invention discloses a lime composite type flame-retardant foaming agent which adopts the technical scheme that the lime composite type flame-retardant foaming agent consists of quicklime powder, attapulgite argil powder with an air purification function, hydrogen peroxide, magnesium hydroxide, fatty alcohol-polyoxyethylene ether sodium sulfate, superfine polyvinyl alcohol powder, simethicone and water, and cream ingredients of the lime composite type flame-retardant foaming agent are mixed to form cream, and then mixed to form the finished lime composite type flame-retardant foaming agent. Porous foam slurry is formed after the lime composite type flame-retardant foaming agent is mixed with water at a high speed, and a flammable material can be isolated from air rapidly, so that a flame-retardant purpose and a fire-extinguishing purpose can be achieved; a product produced by the lime composite type flame-retardant foaming agent has effects of flame retardancy, warm keeping, heat insulation and sound insulation, and has the air purification function; and the lime composite type flame-retardant foaming agent is suitable for production of flame-retardant and fire-extinguishing lightweight boards, lightweight walls and silencing and noise reduction products.

The invention discloses an environment-friendly slow-release type anti-termite low-smoke halogen-free flame-retardant cable sheath material and a preparation method thereof, and belongs to the field of preparation of halogen-free flame-retardant cable sheath materials.According to the invention, a mosquito-repelling and insect-killing liquid using zeolite powder as a slow-release carrier is added into raw materials, and the raw materials of the mosquito-repelling and insect-killing liquid adopt plant extracts with an ant-repelling effect, so the mosquito-repelling and insect-killing liquid does not generate harmful substances such as lead, halogen and the like during manufacturing and use, and has the characteristics of no halogen, flame retardance, low smoke and environmental friendliness.

The invention discloses a compound type tailing flame retardant foaming agent. The technical scheme of the foaming agent is characterized in that the compound type tailing flame retardant foaming agent comprises attapulgite clay tailing powder, attapulgite china clay powder having an air purification function, hydrogen peroxide, magnesium hydrate, sodium alcohol ether sulphate, superfine polyving akohol powder, dimethicone and water. Compound type tailing flame retardant foaming agent paste ingredients are stirred into a paste, and then the ingredients are stirred into a finished product of the compound type tailing flame retardant foaming agent. After the compound type tailing flame retardant foaming agent is stirred with water at a high speed, porous foamed slurry is formed, an inflammable material can be prevented from being contacted with air rapidly, and the purposes of inflaming retarding and extinguishment are achieved; a product produced by the compound type tailing flame retardant foaming agent not only has the effects of inflaming retarding, heat preservation, thermal insulation and sound insulation, but also has the air purification function; and the compound type tailing flame retardant foaming agent is suitable for producing inflaming retarding fire-extinguishing products, lightweight boards, lightweight walls and noise reduction products.

The invention discloses a ventilated fiber cloth, and belongs to the field of fiber cloths. The ventilated fiber cloth is formed by compositing bamboo fibers, cotton fibers, aramid fibers and ramie fibers. According to the prepared ventilated fiber cloth, shell fabric is soft and close fitted, air permeability is good, and wet absorption air permeability of the ramie fibers in the ventilated fiber cloth is 3-5 times of that of the cotton fibers. Simultaneously, the ventilated fiber cloth contains beneficial elements of cerumen, pyrimidine, purine and the like, has bacterium inhibition, ventilation, cooling and corrosion prevention functions, and furthermore can effectively achieve ventilation and flame resisting effects due to the fact that the aramid fibers have flame resisting effects.

The invention discloses a flint clay compound type antiflaming foaming agent. The key point of the technical scheme is that the flint clay compound type antiflaming foaming agent comprises calcined flint clay powder, attapulgite pottery clay powder having a function of air purification, hydrogen peroxide, aluminium hydroxide, sodium alcohol ether sulphate, superfine polyvinyl alcohol powder, simethicone and water; and pasty ingredients of the flint clay compound type antiflaming foaming agent are stirred to a paste, and then the ingredients of the flint clay compound type antiflaming foaming agent are stirred to a finished product of the flint clay compound type antiflaming foaming agent. After the flint clay compound type antiflaming foaming agent is added with water for stirring at a high speed, porous foam slurry is formed, so that the contact between a combustible material and the air can be rapidly isolated, and flame retardance and extinguishment are achieved; the product produced by using the flint clay compound type antiflaming foaming agent has effects of heat preservation, thermal insulation and sound insulation, as well as the function of air purification; and the flint clay compound type antiflaming foaming agent is suitable for producing a light plate, a light wall body and products for inflaming retarding, extinguishment, sound attenuation and noise reduction.

The invention discloses a weaving process for multi-functional clothing fabrics, which includes bamboo fibers, pure cotton strands and cotton yarns, and is characterized in that it comprises the following steps: the first step: adding heating wire Twist the strands by twisting equipment; the second step: cut the twisted strands by a shearing machine, and the length is between 10-100cm; the third step: arrange every 3 strands with conductive filaments Enter warp beam, weave with high-speed rapier loom, high-speed rapier loom process preparation, pass the finishing workshop inspection according to the process; the fourth step: then put it into the sterilizing and disinfecting solution for disinfection for 4-8 hours; the fifth step: use The flame retardant is sprayed by the spraying machine, dried by the dryer, and tested for flame retardancy; the sixth step: finalizing, sorting and testing the finished product.

The invention discloses an asbestos mesh gel foam mud fire prevention and extinguishing agent. The key point of the technical scheme adopted by the invention lies in that the asbestos mesh gel foam mud fire prevention and extinguishing agent is composed of an asbestos composite flame retardant foaming agent, attapulgite pottery clay powder with an air purifying function, inorganic fiber spray coating cotton, asbestos powder, coal gangue powder, expanded perlite powder, sodium alginate and water. The ingredients of the asbestos mesh gel foam mud fire prevention and extinguishing agent are input into a rake type mixing machine to undergo high-speed stirring, thus obtaining the asbestos mesh gel foam mud fire prevention and extinguishing agent. The mesh gel foam mud is sprayed to a burning coal layer by an inorganic fiber spray coating machine, thus facilitating generating an integral mesh gel foam mud film in a fire prevention and extinguishing process. The film can always cover and adhere to an ore bed surface to rapidly isolate the burning coal layer from air, prevent coal mine from keeping burning and avoid reburning of the coal layer, thus reaching the purposes of flame retardance and fire prevention and extinguishing. The asbestos mesh gel foam mud fire prevention and extinguishing agent is suitable for fire prevention and extinguishing of coal mines, mine operation areas and forests.

The invention discloses an intumescent flame retardant of a borate derivative and a preparation method thereof. The name of the borate derivative is 1,3,5-tris-{4,6-bis-[([1,3,2] dioxaborolan-2-oxo)-oxethyl]-1,3,5-triazine-2-oxo}benzene. During preparation, phloroglucinol and N-ethyldiisopropylamine are added into a tetrahydrofuran solution and dropwisely added into the tetrahydrofuran solution of cyanuric chloride, and filtering is performed after the reaction; purification is performed to obtain an intermediate product 1; ethylene glycol and methylbenzene are stirred and mixed, boric acid is added, the temperature is increased continuously, stirring and backflow are performed, methylbenzene is removed, vacuum drying is performed, and an intermediate product 2 is obtained; under the nitrogen protection, the intermediate product 2 is dissolved into the tetrahydrofuran solution, then, sodium hydroxide is added, the tetrahydrofuran solution with the intermediate product 1 is added in batches, and a reaction is performed; suction filtration is performed, liquid-phase spinning drying is performed, and separation is performed to obtain the intumescent flame retardant of the borate derivative. The borate derivative can be adopted as the good environment-friendly organic fire retardant.

The invention discloses a single-core flexible waterproof cable and a production method thereof. The single core flexible waterproof cable comprises a conductor, a water-blocking layer, and an insulation layer. The water-blocking layer and the insulation layer are sequentially, from inside to outside, disposed on the outer part of the conductor in a wrapped manner. The conductor is formed by intertwisting a plurality of copper wires and a plurality of water-blocking filaments, and the cross section of the conductor is smaller than 10mm2. The diameter of the single filament before the water swelling of the water-blocking filaments is smaller than or equal to the diameter of the single filament of the copper wires, and the diameter of the single filament of the copper filaments is smaller than 0.18mm. The radial and vertical all-directional three-dimensional waterproof effect can be achieved by adopting the waterproof filaments in the conductor, the water-blocking tape disposed on the outer side of the conductor, and the insulation waterproof function of the insulation layer.