79 results about "Halogen free" patented technology

The invention relates to the technical field of cables, and provides a polyethylene low-smoke halogen-free flame-retardant power cable which comprises a conductor, an insulating layer, a sheath layer, a halogen-free flame-retardant layer, a flame-retardant filling material and a cooling assembly, the insulating layer wraps the conductor, the halogen-free flame-retardant layer is arranged outside the insulating layer, and the sheath layer wraps the sheath layer. The halogen-free flame-retardant layer is wrapped by the sheath layer, the portion between the halogen-free flame-retardant layer and the insulating layer is filled with the flame-retardant filling material, the multiple cooling assemblies are arranged outside the sheath layer and used for cooling the sheath layer, and each cooling assembly comprises two cold water rings and a cold water plate. The cold water rings are detachably arranged outside the sheath layer, the cold water plate is arranged between the two cold water rings, the cold water plate is communicated with the cold water rings, and the cold water plate is in contact with the outside of the sheath layer. According to the technical scheme, the problem that a halogen flame retardant in the prior art is only suitable for low-temperature flame retardance and is difficult to meet the flame retardance requirement of the cable at high temperature is solved.

The utility model relates to high polymer material processing equipment technical field, concretely relates to a kind of efficient mixing device of halogen-free engineering plastics carbon black, including double-screw extruder main body and the die head of being installed in the output end of double-screw extruder main body, channel is opened in die head and is communicated with the extrusion cavity of double-screw extruder main body, the top and bottom of die head are all penetrated channel and are equipped with jack, two jacks are jointly inserted with the mounting plate that can slide up and down, several square holes that are equally spaced distribution are penetrated and equipped on the mounting plate, several square holes are all detachably installed with filter screen, several filter screens are all vertical and filled with entire flow channel, by lifting electric cylinder drive mounting plate up and down sliding, different filter screen can be switched in non-stop state, avoid the cumbersome operation of traditional screen change and need to stop die head disassembly, improve production efficiency, multiple square filter screens are vertically arranged, increase filtration area, extend jamming time, suitable for high-filled carbon black formula.

The invention discloses high-temperature halogen-free soldering flux, solder paste and a preparation method. The high-temperature halogen-free soldering flux comprises 30%-50% of a high-boiling-point solvent, 30%-40% of rosin, 1%-8% of modified thermoplastic resin, 5%-10% of an active agent, 0.5%-1.0% of a modified surfactant, 4%-8% of a thixotropic agent, 0.5%-3% of metal salt and 3%-5% of an antioxidant. The solder paste comprises 85%-88% of lead-free metal alloy powder and 12%-15% of high-temperature halogen-free scaling powder. Weighing an organic solvent, adding into a container, and heating to 80-95 DEG C; adding the thixotropic agent and uniformly stirring; the temperature is reduced to 60-70 DEG C, rosin, modified thermoplastic resin, an active agent, metal salt, an antioxidant and a modified surfactant are weighed and added, constant-temperature stirring is conducted till dissolution is achieved, bubbles in the scaling powder are discharged, the scaling powder is taken out and cooled into paste, the materials are ground, and the high-temperature halogen-free scaling powder is obtained.

Embodiments in accordance with the present invention encompass compositions containing the polymer formed from a variety of polycycloolefinic monomers at least one of which monomer contains an additional unpolymerized ethylenic bond, melamine, clay such as bentonite or montmorillonite, optionally fillers such as hexagonal boron nitride or silica, a crosslinker, a free radical initiator, a tackifier and one or more suitable additives. The compositions of this invention can be formed into a variety of three-dimensional insulating articles upon exposure to suitable high temperature, such as for example films. The objects formed from the compositions of this invention exhibit hitherto unattainable low dielectric constant and low-loss properties, fire-retardancy and very high thermal properties. The compositions of this invention are useful in various applications, including as insulating materials in millimeter wave radar antennas, among others. The films formed from the compositions of this invention exhibit a UL-94 rating of at least V-1, dielectric constant (Dk) less than 2.9 and dielectric dissipation factor (Df) of less than 0.003.

There is provided a technique that includes: supplying a film formation inhibition gas to the substrate, which includes a first base and a second base on a surface of the substrate, to form a film formation inhibition layer on a surface of the first base; supplying a film-forming gas to the substrate after forming the film formation inhibition layer on the surface of the first base, to form a film on a surface of the second base; and supplying a halogen-free substance, which chemically reacts with the film formation inhibition layer and the film, to the substrate after forming the film on the surface of the second base, in a non-plasma atmosphere.

The invention relates to the field of flame-retardant modified polyolefin master batch materials, in particular to a halogen-free flame-retardant master batch as well as a preparation method and application thereof. The halogen-free flame-retardant master batch is prepared from carrier resin, a halogen-free flame-retardant system, a coupling-dispersing composite additive, a small amount of antioxidant, a small amount of lubricant and a small amount of nucleating agent, and the creativity of the halogen-free flame-retardant master batch can be expanded and highlighted through the synthesis direction of epoxy acrylic resin. A halogen-free flame-retardant system formed by surface activation of aluminum diethylhypophosphite, coating of ammonium polyphosphate microcapsules, nano layered barrier modification of montmorillonite and matching of melamine polyphosphate can be uniformly distributed in carrier resin, and the flame-retardant protection performance of a plastic product can be effectively improved under the condition of low filling amount; the method is simple in process, low in energy consumption and suitable for flame-retardant modification of films, fibers, injection molding products and extruded products.

The invention discloses an epoxy adhesive for an IC (integrated circuit) packaging box dam and a preparation method of the epoxy adhesive. The epoxy adhesive comprises the following raw material components in percentage by mass: 7.5-10% of epoxy resin; 10 to 15% of polycarbonate polyol; 10-15% of an active epoxy toughening agent; 0.5-1.0% of a curing agent; 1-3% of a silane coupling agent; 1-3% of an inorganic thixotropic agent; and 60-70% of a spherical silicon dioxide filler. By adopting the raw material components with specific types and contents, the adhesive with higher Tg and lower CTE can be obtained, and the adhesive is suitable for high-frequency / high-temperature application (such as an automobile radar chip); the halogen-free and low-volatility (VOC) formula conforms to the European Union RoHS / REACH regulations; moreover, the adhesive can meet the properties of high adhesion, low stress, rapid curing and the like, and can meet the long-term aging property (such as 85 DEG C / 85% RH (Ruhrstahl Heraeus) test).

The application belongs to the field of composite ink coating, and particularly discloses a high-thermal-conductivity and high-adhesion copper foil coating ink, a preparation method and application thereof.The ink coating comprises, by weight, 15-25 parts of epoxy resin, 10-20 parts of polyurethane resin, 5-12 parts of modified cellulose, 30-45 parts of thermal-conductivity filler, 8-15 parts of aliphatic polyisocyanate curing agent, 20-35 parts of solvent, 2-5 parts of silane coupling agent and 0.5-3 parts of pigment.The modified cellulose is prepared by modification of halogen-free betaine hydroxide, can synergize with the double-resin matrix to enhance the interface bonding force and build a three-dimensional thermal-conductivity network.After the ink coating is coated on the surface of electrolytic or calendered copper foil, the thermal conductivity coefficient of the coating is greater than 0.4 W / (m·K), the darcy value is greater than 38, the crosshatch test is greater than or equal to 4B, there is no peeling after alcohol wiping, the color difference ΔE is less than 1, and the ink coating is suitable for high-frequency circuit substrates and lithium battery current collectors.

The utility model relates to the technical field of synthetic leather, and discloses flame-retardant environment-friendly synthetic leather, which comprises synthetic leather base cloth, a water-based flame retardant coating, a solvent-free polyurethane layer, a polyurethane middle layer and a polyurethane surface layer, the solvent-free polyurethane layer is attached to the upper end face of the water-based flame retardant coating, the polyurethane middle layer is smeared on the upper end face of the solvent-free polyurethane layer, and the polyurethane surface layer is arranged on the upper end face of the polyurethane middle layer in a blade coating mode. According to the flame-retardant environment-friendly synthetic leather, the addition of organic solvents is greatly reduced from the raw materials and the formula, so that the harm of the organic solvents to the health of workers in the production process is reduced, almost half of human resources are saved, and the used flame retardant is also an environment-friendly halogen-free flame retardant, so that the harm to human bodies is smaller, and the flame-retardant effect is better.

This invention provides a method for preparing a halogen-free PETG label film, belonging to the field of label film preparation technology. The method includes: corona treatment of a PETG substrate layer; coating the substrate surface with a halogen-free functional coating liquid containing waterborne polyurethane acrylic composite resin, nano-inorganic modifier, and crosslinking agent; bonding the coated substrate layer and the halogen-free adhesive layer together and then sending them into a curing oven, where the functional coating and the interlayer bonding with the adhesive layer are simultaneously completed under segmented programmed temperature rise conditions, resulting in physical entanglement and chemical crosslinking at the interface; and finally, cooling and shaping to obtain the label film. This invention significantly enhances the interlayer bonding strength through a simultaneous curing and composite process. The resulting product has a light transmittance ≥91%, haze ≤2.5%, peel strength ≥8N / 25mm, and performance retention ≥90% after damp heat aging. Furthermore, the chlorine and bromine content are both ≤900ppm, meeting the halogen-free standard.

The application provides a water-based flame-retardant ink for a PET film and a preparation method thereof and the PET film, and belongs to the technical field of paints. The water-based flame-retardant ink comprises a first component and a second component. The first component comprises 40-80wt% of a water-dispersed halogen-free modified polyester resin, 20-40wt% of a water-dispersed halogen-free flame-retardant additive, 5-10wt% of a quick-drying solvent, 0.3-0.5wt% of a defoaming agent, 0.3-0.5wt% of a wetting and leveling agent, 5-10wt% of a film-forming additive, 0.5-2wt% of an alkali-soluble anionic thickener and 5-10wt% of an anti-gloss additive. The second component comprises 40-70wt% of a water-dispersed crosslinking agent and 30-60wt% of an ester solvent. The mass ratio of the first component to the second component is 100:(3-10). The application can solve the compatibility problem of direct adhesion of the PET film and the flame retardation, and has no halogen emission and a long paint activation period.

The present invention provides a polymer composition comprising: a first ethylene-based polymer having a crystallinity of 25 wt% or more at 110°C as measured according to the Crystallinity Test; a second ethylene-based polymer having a crystallinity of 40 wt% or less at 23°C as measured according to the Crystallinity Test; and 40 wt% or more of a halogen-free flame retardant filler.

Currently, due to their inherent flammability, polyurethane reinforcement grouting materials for coal mines typically incorporate halogen-containing flame retardants during their preparation to enhance their flame-retardant properties. However, polyurethane materials containing these flame retardants remain in the finished coal, potentially causing catalyst poisoning in coal chemical production. Furthermore, halogen-containing flame retardants exhibit high smoke production and highly toxic fumes when exposed to open flames, posing a significant risk of injury to personnel. This invention addresses these drawbacks by adding our company's DMMP microcapsules and powder dispersant to the system and adjusting the formulation, thus preparing a halogen-free polyurethane reinforcement material for reinforcing coal and rock masses in coal mines. This material overcomes the aforementioned drawbacks and possesses significant practical application value.

Embodiments in accordance with the present invention encompass compositions containing a blend of polymers formed from a variety of polycycloolefinic monomers at least one of which monomer contains an olefinic functionality and another monomer contains an anhydride functionality, melamine, montmorillonite and optionally other fillers such as silica, a crosslinker, a free radical initiator, a tackifier and one or more suitable additives. The compositions of this invention can be formed into a variety of three-dimensional insulating articles upon exposure to suitable high temperature, such as for example films. The objects formed from the compositions of this invention exhibit hitherto unattainable low dielectric constant and low-loss properties, fire retardancy and very high thermal properties. The compositions of this invention are useful in various applications, including as insulating materials in millimeter wave radar antennas, among others. The films formed from the compositions of this invention exhibit a UL-94 rating of at least V-1, dielectric constant (Dk) less than 2.8 and dielectric dissipation factor (Df) of less than 0.002.

The invention provides water-based flame-retardant ink for a PET (Polyethylene Terephthalate) film, a preparation method of the water-based flame-retardant ink and the PET film, and belongs to the technical field of coatings. Comprising a first component and a second component, wherein the first component is prepared from the following components in percentage by mass: 40 to 80 weight percent of water-dispersed halogen-free modified polyester resin, 20 to 40 weight percent of water-dispersed halogen-free flame-retardant aid, 5 to 10 weight percent of quick-drying solvent, 0.3 to 0.5 weight percent of defoaming agent, 0.3 to 0.5 weight percent of wetting flatting agent, 5 to 10 weight percent of coalescing agent, 0.5 to 2 weight percent of alkali-soluble anionic thickener and 5 to 10 weight percent of matting aid; the second component comprises the following components in percentage by mass: 40-70wt% of a water dispersible cross-linking agent and 30-60wt% of an ester solvent; the mass ratio of the first component to the second component is 100: (3-10). According to the invention, the compatibility problem of direct adhesion of a PET film and flame retardance can be synergistically solved, no halogen is discharged, and the activation period of the coating is long.

Embodiments in accordance with the present invention encompass compositions containing the polymer formed from a variety of polycycloolefinic monomers at least one of which monomer contains an additional unpolymerized ethylenic bond, melamine, clay such as bentonite or montmorillonite, optionally fillers such as hexagonal boron nitride or silica, a crosslinker, a free radical initiator, a tackifier and one or more suitable additives. The compositions of this invention can be formed into a variety of three-dimensional insulating articles upon exposure to suitable high temperature, such as for example films. The objects formed from the compositions of this invention exhibit hitherto unattainable low dielectric constant and low-loss properties, fire-retardancy and very high thermal properties. The compositions of this invention are useful in various applications, including as insulating materials in millimeter wave radar antennas, among others. The films formed from the compositions of this invention exhibit a UL-94 rating of at least V-1, dielectric constant (Dk) less than 2.9 and dielectric dissipation factor (Df) of less than 0.003.

The invention discloses a fireproof shielding instrument cable and a production process thereof, and belongs to the technical field of cable manufacturing, and the cable comprises a conductor layer, a fireproof layer, an insulating layer, a sub-shielding layer, a cabling filling layer, a total shielding layer and an outer sheath layer from inside to outside; the conductor layer is a carbon nanotube copper alloy conductor, the fireproof layer is a double-sided plastic-coated water glass calcined mica tape, the sub-shielding layer and the total shielding layer are of a composite structure of weaving, a fireproof coating and a copper tape, and the outer sheath layer is of a ceramic silicone rubber and modified polyether-ether-ketone double-sheath structure. The production process comprises the steps of conductor preparation, sequential forming of each layer, cabling filling, shielding, sheath extrusion and the like. The cable can resist the temperature of 1000-1200 DEG C, has a multi-layer fireproof shielding effect, is high in structural reliability, is halogen-free from all materials, has the service life exceeding 30 years, is suitable for instrument signal transmission and power transmission in fireproof places, and solves the problem that the existing cable is easy to lose efficacy in an extreme environment.

The present invention provides a flame-retardant electric wire which is excellent in the properties required of flame-retardant electric wires, such as mechanical properties, oil resistance, cold resistance, heat aging resistance, flexibility and operability, and has a halogen-free insulation layer. The flame-retardant electric wire (1) has a conductor (2) and an insulation layer (3) covering the outer periphery of the conductor (2) and composed of a resin composition. The resin composition contains 30 to 180 parts by mass of a flame retardant, 7 parts by mass or more of an antioxidant and 1 part by mass or more of a copper inhibitor relative to 100 parts by mass of a base polymer. The base polymer is composed of 50 to 90 parts by mass of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 45 to 60% by mass and 10 to 50 parts by mass of an ethylene-alpha-olefin copolymer. The flame retardant comprises a polymer surface-treated with a silane coupling agent and having a BET specific surface area of ​​6 m 2 / g or less of magnesium hydroxide and / or the above-mentioned aluminum hydroxide. In addition, the resin composition is cross-linked.

The invention discloses an epoxy asphalt reaction type phosphorus-silicon flame retardant, epoxy asphalt concrete and a preparation method of the epoxy asphalt reaction type phosphorus-silicon flame retardant. The epoxy asphalt reactive phosphorus-silicon flame retardant contains a diepoxy group and a phosphorus-silicon synergistic skeleton, so that the limit oxygen index of epoxy asphalt can be greatly improved, meanwhile, good mechanical properties are kept, and the migration rate of the flame retardant is reduced. Compared with the existing reaction type phosphorus-silicon flame retardant, the phosphorus-silicon flame retardant has better flame retardant property, is used for preparing epoxy asphalt concrete, not only improves the flame retardant property, but also can further improve the mechanical property and pavement performance of the asphalt concrete, and is suitable for traffic infrastructure, building municipal engineering, special industrial facilities and other key scenes. According to the method, the silane coupling agent hydrolysate and the alkyl phosphate are subjected to phosphorylation reaction, then epoxy chloropropane is used for blocking, the preparation process is simple, no halogen or heavy metal participates in the preparation process, and the method conforms to European Union REACH regulations and domestic low-toxicity and low-harm building material standards.

The present invention relates to a thermoplastic composition comprising, based on the weight of the composition, a) from 50 - 94 wt.% of aromatic polycarbonate, b) from 5 - 45 wt.% of glass fibers, c) from 0.05 - 0.50 wt.% of halogen free flame retardant salt, d) from 0 - 5 wt.% of further components, wherein the sum of components a) - d) is 100 wt.% and wherein the thermoplastic composition has or is selected to have a UL94 rating of V-0 performed at 3.0 mm. The present invention furthermore relates to an article comprising the thermoplastic composition.

The invention discloses a halogen-free flame-retardant bio-based polyhydroxy compound, a preparation method of the halogen-free flame-retardant bio-based polyhydroxy compound and application of a grounding anti-corrosion coating, and belongs to the technical field of grounding anti-corrosion materials. A P-containing structure in the polyhydroxy compound and an N element can form a synergistic flame-retardant effect, so that the polyhydroxy compound can be added into an epoxy resin system as a flame retardant. In addition, the epoxy resin system with flame-retardant, conductive and anti-corrosion properties provided by the invention comprises the following components: epoxy resin, polyaniline modified epoxy resin, a diluent, pretreated graphene, a curing agent, a flame retardant and simethicone, the flame retardant comprises the halogen-free flame-retardant bio-based polyhydroxy compound. The system has good flame-retardant, conductive and anti-corrosion performance when being applied to a grounding body of an electric power system.

A polycarbonate composition comprises a linear homopolycarbonate and optionally, a styrene-containing copolymer; a poly(carbonate-siloxane) comprising about 10 wt % to less than about 30 wt % siloxane, present in amount effective to provide about 1 to about 6 wt % siloxane, based on the total weight of the composition; an ultra-high molecular weight poly dimethylsiloxane, present in an amount effective to provide greater than about 0.3 to less than about 0.9 wt % siloxane, based on the total weight of the composition; a flame retardant; and optionally, an additive composition. Molded samples of the polycarbonate compositions have a UL94 flame test rating or V-0 at a 1.5 mm thickness, exhibit anti-drip properties, and can be essentially halogen-free, i.e., the polycarbonate compositions include about 900 parts per million (ppm) or less of each of chlorine, bromine, and optionally fluorine and also include about 1500 ppm or less of total chlorine, bromine, and fluorine content.

The application discloses an epoxy asphalt reactive phosphorus-silicon flame retardant, an epoxy asphalt concrete and a preparation method thereof. The epoxy asphalt reactive phosphorus-silicon flame retardant contains a double epoxy group and a phosphorus-silicon synergistic skeleton, can greatly improve the limiting oxygen index of the epoxy asphalt, maintains good mechanical properties, and reduces the migration rate of the flame retardant. Compared with existing reactive phosphorus-silicon flame retardants, the epoxy asphalt reactive phosphorus-silicon flame retardant has better flame retardant performance, is used for preparing the epoxy asphalt concrete, improves the flame retardant performance of the epoxy asphalt concrete, and further improves the mechanical properties and road performance of the asphalt concrete, and is suitable for key scenes such as traffic infrastructure, building municipal engineering and special industrial facilities. The epoxy asphalt reactive phosphorus-silicon flame retardant is prepared through a phosphorylation reaction of a silane coupling agent hydrolysis product and an alkyl phosphate, and then end-capped by epoxy chloropropane, the preparation process is simple, no halogen and heavy metal are involved, and the epoxy asphalt reactive phosphorus-silicon flame retardant meets the EU REACH regulation and the domestic 'low toxicity and low harm' building material standard.

The invention provides a high-performance SBS waterproof coiled material containing magnesium hydroxide and nano clay. The high-performance SBS waterproof coiled material comprises 70-80 parts of SBS modified asphalt; 10 to 20 parts of surface modified magnesium hydroxide; 3 to 8 parts of organic nano clay; 5-10 parts of a plasticizer; 2-5 parts of a stabilizer; and 1-3 parts of an antioxidant. The preparation method comprises the following steps: (1) a raw material pretreatment stage; (2) a mixing and plasticizing stage; and (3) a forming and shaping stage to obtain the finished coiled material. Through the synergistic effect of the surface modified magnesium hydroxide and the organic nano-clay, high flame retardance, excellent weather resistance and excellent mechanical properties of the SBS waterproof coiled material are synchronously realized under the halogen-free condition, and the production cost is remarkably reduced through a gradient dispersion process.

The application relates to the technical field of catalyst preparation, and particularly discloses a preparation method of a high-crosslinking polymer / SiO2 aerogel composite material and application thereof. A kind of aluminum-doped silica aerogel is synthesized by selecting solid waste coal gangue as a silicon source and adopting a sol-gel method. Further, in the presence of SiO2 aerogel, a high-crosslinking polymer is in-situ loaded through a Friedel-Crafts alkylation reaction to obtain a high-crosslinking polymer / SiO2 aerogel composite material. The prepared HCPs@SiO2 composite material has the characteristics of halogen-free, large specific surface area, wide pore size distribution and the like. As a halogen-free catalyst, the composite material exhibits excellent catalytic activity and cycle stability in the cycloaddition reaction of CO2 and epoxide, the environmental-friendly characteristics avoid the toxicity residue and corrosion risk of a traditional halogen-containing system, meanwhile, the product post-processing process is simplified, and the composite material shows significant potential in industrial-scale application.

Granules for preparing a floor or wall covering, and a manufacturing method for the granules. The granules for preparing a floor or wall covering comprises: 1-10% of natural rubber particles or powder and 90-99% of particles or powder containing thermoplastic polyurethane, wherein the particles or powder containing thermoplastic polyurethane is particles or powder for forming a thermoplastic polyurethane floor or covering, and the natural rubber particles or powder comprises 20-80% of a natural rubber. The addition of a natural rubber can improve the elasticity and wear resistance of a halogen-free plastic floor or wall covering.

Embodiments in accordance with the present invention encompass compositions containing a polymer blend formed from a high molecular weight polymer and a low molecular weight polymer where the polymers are formed from a variety of polycycloolefinic monomers at least one of which polymer is formed from a monomer containing an epoxy functional group, melamine, fillers such as hexagonal boron nitride or silica, a crosslinker, a free radical initiator, a tackifier and one or more suitable additives. The compositions of this invention can be formed into a variety of three-dimensional insulating articles upon exposure to suitable high temperature, such as for example films. The objects formed from the compositions of this invention exhibit hitherto unattainable low dielectric constant and low-loss properties, fire-retardancy and very high thermal properties. The compositions of this invention are useful in various applications, including as insulating materials in millimeter wave radar antennas, among others. The films formed from the compositions of this invention exhibit a UL-94 rating of at least V-1, dielectric constant (Dk) less than 2.8 and dielectric dissipation factor (Df) of less than 0.002.

A composition and method for reducing the coefficient of friction and required pulling force of a wire or cable are provided. A composition of aqueous emulsion is provided that is environmentally friendly, halogen free and solvent free. The composition is compatible with various types of insulating materials and may be applied after the wire or cable is cooled and also by spraying or submerging the wire or cable in a bath. The composition contains lubricating agents that provide lower coefficient of friction for wire or cable installation and continuous wire or cable surface lubrication thereafter.

The utility model relates to the field of floors, and particularly discloses a halogen-free environment-friendly floor which comprises a halogen-free base material layer, a decorative layer, a wear-resistant layer and a scratch-resistant layer are sequentially arranged on the upper surface of the halogen-free base material layer, and a balance layer and a mute layer are sequentially arranged on the lower surface of the halogen-free base material layer. The halogen-free base material layer, the balance layer and the mute layer are laminated and glued together; the halogen-free floor material is prepared by adopting the halogen-free base material layer, so that the damage of halogen in the traditional floor material to the environment and the potential harm to a human body are avoided. Meanwhile, the floor material has good degradation performance, can be rapidly degraded in the natural environment, relieves the burden on the environment, is light in weight, high in strength, good in flame retardance, good in acid-base resistance and high-temperature resistance, is suitable for chemical environments such as acid and base, does not have the phenomena of aging, breakage, discoloration and the like after being used for a long time, and prolongs the service life.