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31results about How to "Improve heat aging cracking resistance" patented technology

Graphene fiber modified nano adsorbing material and preparation method

InactiveCN106243652AGood thermal insulation performanceExcellent fire resistance and aging resistanceAdhesiveZinc sulfide
The invention discloses a graphene fiber modified nano adsorbing material and a preparation method. The nano adsorbing material comprises organic silicon resin, an organic solvent, glass beads, titanium dioxide, quartz sand, silicon carbide micro powder, nano cerium oxide, oxalic acid polyesters, light calcium carbonate, high-water-retention resin polyvinyl alcohol, a dispersing agent, a thickening agent, a brightening agent, zinc sulfide, foamed aluminum, hydroxypropyl methyl cellulose, nano silica, an adhesive, cobalt naphthenate, molybdenum, nickel, propylene glycol and chromium. Due to the fact that molecules of chitosan has positive charges, bacteria with negative charges can be adsorbed, and the material has a sterilization function; structurally, fibrous membrane layers with different diameters and pores are prepared, and in combination with nano graphene between the layers, the porosity and specific surface area of a composite adsorption membrane are improved, and effects are enhanced; by the adoption of pitch-based carbon fibers, the mechanical properties of the material are enhanced, and harmful gas and dust substances in tail gas can be greatly adsorbed and removed.
Owner:SUZHOU RUI TE JIE CHEM PROD CO LTD

Expansion-resistant graphene fiber nano building material and preparation technology thereof

The invention discloses an expansion-resistant graphene fiber nano building material and a preparation technology thereof. The expansion-resistant graphene fiber nano building material comprises the following raw materials in parts by weight: 80-90 parts of an ethylene-vinyl acetate copolymer, 40-50 parts of high-density polyethylene, 20-30 parts of a nano active agent, 2-8 parts of a plasticizer and the like. According to the expansion-resistant graphene fiber nano building material and the preparation technology thereof, provided by the invention, added nitrile rubber modified phenolic resin is mixed with raw materials to form a mixture, the mixture is cured when heated, and under the action of methylene decomposed by urotropin, the molten resin quickly changes from a linear structure into a non-molten three-dimensional structure; by improving mechanical properties, the expansion-resistant graphene fiber nano building material has high temperature resistance and low expansion; structurally, fiber membrane layers with different diameters and porosities are prepared, nanographene among bonding layers improves the porosity and the specific surface area of a composite adsorption membrane and enhances the efficacy; through adoption of asphalt-based carbon fiber, mechanical properties of the expansion-resistant graphene fiber nano building material is enhanced, so that the expansion-resistant graphene fiber nano building material can greatly adsorb and remove harmful gas and dust substances in exhaust gas.
Owner:SUZHOU RUI TE JIE CHEM PROD CO LTD

Modified nano building functional material for magnetic oil-resistant fiber and preparation method of material

The invention discloses a modified nano building functional material for a magnetic oil-resistant fiber and a preparation method of the material. The material is prepared from 50-60 parts of butadiene-acrylonitrile rubber, 30-40 parts of polyurethane rubber, 10-15 parts of 12-methyl hydroxy stearate, 8-12 parts of magnesium methacrylate, 6-10 parts of tri(2-butaneneoxime)cinylsilane, 20-25 parts of nylon-66 short fibers, 5-10 parts of polypropylene glycol adipate and 10-16 parts of diethylene glycol dibenzoate. According to the material, added butadiene-acrylonitrile rubber-modified phenolic resin is mixed with the raw materials and cured during heating, and the molten resin is quickly converted into a non-molten haplotype structure from a linear structure under action of methylene decomposed from urotropine; the mechanical property is improved, and the high temperature resistance and the low expansion property are achieved; by combining nano-graphene among layers, the porosity and the specific surface area of a composite adsorption membrane are increased, and the effects are enhanced; asphalt-based carbon fibers are adopted, therefore, the mechanical property of the material is enhanced, and harmful gas and dust substances in tail gas can be greatly adsorbed and removed.
Owner:常熟市瑞思知识产权服务有限公司

Tear-resistant functional rubber material for magnetic modification and preparation method thereof

InactiveCN106009114AImprove toughnessEnhanced Magnetic AdvantagePorosityRubber material
The invention discloses a tear-resistant functional rubber material for magnetic modification and a preparation method thereof. The tear-resistant functional rubber material for magnetic modification is prepared from epichlorohydrin rubber, butadiene-acrylonitrile rubber, acrylonitrile-butadiene copolymer rubber, diene rubber, styrene-butadiene rubber, regenerated rubber, a heat stabilizer, an adhesive, polydimethyldiallyl ammonium chloride, bentonite and nano cerium oxide. The combination of the epichlorohydrin rubber, butadiene-acrylonitrile rubber, acrylonitrile-butadiene copolymer rubber, diene rubber, styrene-butadiene rubber and regenerated rubber used as main materials greatly enhances the toughness of the material and effectively solves the problem of high cracking rupture tendency of the conveyer belt. The tear-resistant functional rubber material can not generate harmful gases to the human body, has a perfect combination of tear resistance and other properties, and thus, is applicable to various severe working conditions. The nano graphene between every two layers is combined to improve the porosity and specific area of the composite adsorption film and enhance the effect. The asphalt-base carbon fibers are adopted to enhance the mechanical properties of the material, and can greatly adsorb and remove harmful gases and dust substances in the tail gas.
Owner:SUZHOU RUI TE JIE CHEM PROD CO LTD

Aluminum alloy type side-plate compact shelf and production method thereof

The invention discloses an aluminum alloy type side-plate compact shelf. The aluminum alloy type side-plate compact shelf comprises a shelf body, wherein a storage box is arranged on one side of the shelf body, a first water pump is arranged on the top of the storage box, a water inlet of the first water pump is communicated with the storage box through a water delivery pipe, and the water delivery pipe arranged at a water outlet of the first water pump is communicated with an inner cavity of the shelf body through a through hole formed in a side plate of the shelf body; and a recycling box is arranged on the other side of the storage box, a second water pump is arranged on the top of the recycling box, a water delivery pipe arranged at a water inlet of the second water pump is communicated with a through hole formed in another side plate, and the second water pump is communicated with the recycling box through the water delivery pipe arranged at the water outlet of the second water pump. The aluminum alloy type side-plate compact shelf can be used for simultaneously disinfecting different types of instruments, and the mingling of the instruments can be avoided, so that the placement of the instruments after the disinfection is facilitated, and the problem that partial instruments are not thoroughly disinfected due to the stacking of the instruments is avoided; and the use is relatively safe and convenient, and disinfection liquid can be intensively treated after the disinfection.
Owner:JIANGXI EQUIP INDAL GROUP GREAT INSURANCENT

Garden water system water circulating purifying technology

The invention provides a garden water system water circulating purifying technology. The garden water system water circulating purifying technology comprises the steps of establishment of a water system, driving of water flow circulating, filtering, biological inactivation treatment, gas floating purifying treatment, water conditioning and water mixing. By means of the garden water system water circulating purifying technology, the working efficiency of daily management and purification work of the garden water system can be effectively improved, and water environment pollution phenomena caused by water eutrophy, suspended solids, pond mud at the bottom of water and the like are avoided; the garden water landscape environment is not influenced while water purification work is carried out, few water resources are consumed, the circulation utilization rate is high, various contamination ingredients in water can be effectively purified and recycled, and the resource utilization rate is increased; meanwhile, water quality can be effectively regulated, the quality of purified water matches with the quality of garden landscape water, and the phenomenon that due to water quality differences and changes, organisms in garden landscape water do not adapt to the garden landscape water due to changes of the living environment and even die can be avoided.
Owner:BEIJING UNIV OF AGRI

Magnetic modified anti-radiation functional color master batch plastic material and preparation method thereof

The invention discloses a magnetic modified anti-radiation functional color master batch plastic material and a preparation method thereof. The material is composed of the following raw materials in parts by weight: 15-25 parts of phthalate butyl glycol ester, 10-15 parts of tetrafluoroethylene-hexafluoropropylene copolymer, 10-20 parts of acrylonitrile-styrene-acrylate copolymer, 60-80 parts of polycarbonate, 10-15 parts of nanometer barium carbonate, 20-25 parts of aramid staple fiber and 2-10 parts of silicon carbide wafer. The phthalate butyl glycol ester, the tetrafluoroethylene-hexafluoropropylene copolymer, the acrylonitrile-styrene-acrylate copolymer and the polycarbonate are mixed, so that the toughness, abrasive resistance, chemical stability, impact strength and radiation resistance of the material can be promoted; the polymer blends of the raw materials, such as, nanometer barium carbonate, aramid staple fiber and silicon carbide wafer, are blended and modified, so that the radiation resistance of the material can be promoted; on the basis of nanometer graphene among layers, the pore and specific surface area of a compound adsorption film are improved, and the effect is enhanced; and the magnetic modified anti-radiation functional color master batch plastic material meets the color requirement and the compound performance requirement.
Owner:苏州泰如新材料科技有限公司

Magnetic plastic graphene functional external wall panel and preparation method thereof

InactiveCN106221155AImprove performanceHigh magnetic advantagePorosityCarbon fibers
The invention discloses a magnetic plastic graphene functional external wall panel and a preparation method thereof. The magnetic plastic graphene functional external wall panel comprises the following raw materials: magnetic powder, sodium silicate, magnetic iron oxide, magnetic aluminium oxide, nano-titanium dioxide, polydopamine, polyphosphazene, magnetic ferroferric oxide particles, 2-ethylamine phosphate, polyvinylimide, paraffin, higher fatty alcohol, ethylenediaminetetraacetic acid, glass fibers, a heat stabilizer, an adhesive, polydiallyldimethylammonium chloride, bentonite and nano-cerium oxide. According to the invention, alphalt-based carbon fibers are adopted, so that the mechanical property of the material is enhanced, and harmful gas and dust substances of the tail gas can be adsorbed and eliminated greatly; chitosan with positively charged molecules can adsorb bacteria with negative charges, so that a bactericidal function is achieved; in the aspect of the structure, fiber membrane layers with different diameters and porosity are prepared and are combined with nano-graphene among the layers, so that the porosity and the specific surface area of the adsorption membranes are improved and the effects are enhanced. By adoption of the alphalt-based carbon fibers, the mechanical property of the material is enhanced, and harmful gas and dust substances of the tail gas can be adsorbed and eliminated greatly.
Owner:SUZHOU RUI TE JIE CHEM PROD CO LTD

Inorganic vitrification-modified nano environment-friendly rubber material and preparation method thereof

The invention discloses an inorganic vitrification-modified nano environment-friendly rubber material and a preparation method thereof. The inorganic vitrification-modified nano environment-friendly rubber material is prepared from epichlorohydrin rubber, acrylonitrile-butadiene copolymer rubber, diene rubber, styrene-butadiene rubber, regenerated rubber, light calcium carbonate, high-water-retentivity resin polyvinyl alcohol, a dispersing agent, a thickener, a whitener, zinc sulfide, foamed aluminum, hydroxypropyl methylcellulose, nano silicon dioxide, an adhesive, cobalt naphthenate, molybdenum, nickel, propanediol and chromium. The inorganic vitrification-modified nano environment-friendly rubber material is specially used for building external walls, and effectively enhances various properties of the building external wall. The combination of the butadiene-acrylonitrile rubber, acrylonitrile-butadiene copolymer rubber, diene rubber, styrene-butadiene rubber and regenerated rubber used as main materials greatly enhances the toughness of the inorganic vitrification-modified nano environment-friendly rubber material and effectively solves the problem of high cracking rupture tendency of the conveyer belt. The inorganic vitrification-modified nano environment-friendly rubber material can not generate harmful gases to the human body, has a perfect combination of high temperature resistance, tear resistance and other properties, and thus, is applicable to various severe working conditions. The asphalt-base carbon fibers are adopted to enhance the mechanical properties of the material, and can greatly adsorb and remove harmful gases and dust substances in the tail gas.
Owner:SUZHOU RUI TE JIE CHEM PROD CO LTD

Carbon fiber oil-resisting modified nano green and environment-friendly construction base material and preparation method thereof

The invention discloses a carbon fiber oil-resisting modified nano green and environment-friendly construction base material and a preparation method thereof. The carbon fiber oil-resisting modified nano green and environment-friendly construction base material is prepared from the following raw materials: polypropylene fibers, starch ether, fly ash, polypropylene chopped fibers, metakaolin, silicon carbide micro-powder, nano carbon dioxide, white alum, organic silicon resin, nano cerium oxide, vitrified micro-beads, titanium dioxide, and foam aluminum, cobalt, strontium, gallium and chromium. According to the carbon fiber oil-resisting modified nano green and environment-friendly construction base material, nitrile butadiene rubber and polyurethane rubber are compounded so that the base material has excellent oil resistance and good wearing resistance, anti-aging performance and air tightness; an adhesion system is composed of auxiliary agents including 12-methyl hydroxystearate, magnesium methacrylate, vinyltris(methylethylketoximino)silane and the like, and plays an important role in the adhesion of rubber and nylon 66 short fibers, and the rigidity of a rubber product is improved; and added polypropylene glycol adipate and diethylene glycol dibenzoate are matched, so that the oil resistance of the rubber is improved and the temperature resistance of the rubber is enhanced.
Owner:常熟市瑞思知识产权服务有限公司

Medical storage device with anti-aging function

The invention discloses a medical storage device with an anti-aging function. The medical storage device comprises a storage cabinet shell, wheels are arranged on the bottom of the storage cabinet shell, a bottom box is arranged on the bottom of the inner wall of the storage cabinet shell, a vacuum pump is fixedly arranged on the bottom of the inner wall of the bottom box, an air inlet pipeline is arranged on the top of the vacuum pump, an air outlet pipeline is arranged on one side of the vacuum pump, a first air duct is communicated with the end, away from the vacuum pump, of the air outlet pipeline, and the end, away from the air outlet pipeline, of the first air duct penetrates through the storage cabinet shell and extends to the exterior of the storage cabinet shell. The medical storage cabinet with the anti-aging function is provided with the vacuum pump and the pipelines, the vacuum pump and the pipelines are used for removing air in the storage cabinet, and a vacuum state is reached, and an environment for reducing bacteria breeding is created; by arranging a heater, the temperature of the storage cabinet is raised, and under the combined action of the heater and an ultraviolet lamp, bacteria are killed, the risk that a patient is infected by the bacteria is reduced, and the probability that the patient is infected by infectious diseases is reduced.
Owner:苏州祥弘源电子科技有限公司

Intelligent compact shelf with RFID (Radio Frequency Identification Devices) and manufacturing method thereof

The invention provides an intelligent compact shelf with RFID (Radio Frequency Identification Devices) and relates to the field of medical equipment. A medical waste liquid treatment device comprises a base; a filtering tank is fixedly mounted at the top of the base; one side of the filtering tank is communicated with one end of a liquid inlet pipe; the other end of the liquid inlet pipe is communicated with a peripheral sewage inlet pipe; the other side of the filtering tank is communicated with one end of a connecting pipe and the other end of the connecting pipe is communicated with a pH (Potential of Hydrogen) adjusting tank; the pH adjusting tank is located at a right side of the filtering tank; the bottom of the pH adjusting tank is communicated with one end of a fixed pipe. By adopting the medical waste liquid treatment device, pathogens including ova and the like in waste liquid are inactivated and lose the contagion capability, and harmful substances including bacteria in the waste liquid are removed, so that harmful impurities are completely removed, and pollution to water and soil is avoided; the disease occurrence probability is reduced, and a good protection effect on the ecological environment is realized.
Owner:JIANGXI EQUIP INDAL GROUP GREAT INSURANCENT

Anti-aging nano modified masterbatch carrier for controlling radiation and preparation method thereof

The invention discloses an anti-aging nano modified masterbatch carrier for controlling radiation and a preparation method thereof. The anti-aging nano modified masterbatch carrier comprises the following raw materials in parts by weight: 15-25 parts of phthalate butyl glycol ester, 10-15 parts of a tetrafluoroethylene-hexafluoropropylene copolymer, 10-20 parts of an acrylonitrile-styrene-acrylate copolymer, 60-80 parts of polycarbonate, 10-15 parts of nano barium carbonate, 20-25 parts of an aramid short fiber and 2-10 parts of silicon carbide platelets. Phthalate butyl glycol ester, tetrafluoroethylene-hexafluoropropylene copolymer and acrylonitrile-styrene-acrylate copolymer are mixed with polycarbonate, so that the toughness, the wear resistance, the chemical stability, the impact strength and the radiation resistance of the material are improved; polymer blends such as nano barium carbonate, the aramid short fiber and the silicon carbide platelets are blended and modified, so that the radiation-proof property of the material can be improved; and meanwhile, gas harmful to a human body is not generated at a relatively high temperature and the properties of the high temperature resistance and the tear resistance are perfectly fused, so that the anti-aging nano modified masterbatch carrier can be applied to various bad conditions for working.
Owner:苏州泰如新材料科技有限公司

Tear-resistant nano-modified rubber for controlling noise and preparation method thereof

The invention discloses tear-resistant nano-modified rubber for controlling noise and a preparation method thereof. The tear-resistant nano-modified rubber comprises, by weight, 5-8 parts of dimethyl vinyl ethyoxyl silane, 4-6 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 8-10 parts of allophane powder, 15-20 parts of maleic anhydride grafted polyvinyl chloride, 50-70 parts of polystyrene, 20-30 parts of polyisocyanurate, 5-8 parts of glass pumice, 4-6 parts of porous manganese slag, 6-8 parts of hollow microbeads, and the like. The tear-resistant nano-modified rubber has the advantages that the dimethyl vinyl ethyoxyl silane and the fatty alcohol-polyoxyethylene ether sodium sulfate are used to modify the allophane powder, the even distribution of the allophane powder in a polymer base material is benefited, the compatibility of the allophane powder with the polymer base material is increased, the modified allophane powder is added into plastics, and the flame retardance of the plastics can be increased evidently; the compatibilizer used by the tear-resistant nano-modified rubber is the maleic anhydride grafted polyvinyl chloride, the maleic anhydride grafted polyvinyl chloride is combined with the polystyrene to allow the polyisocyanurate, the glass pumice, the porous manganese slag, the hollow microbeads and the like to be well dispersed in a polystyrene base, incident sound waves borne by the composite material can be well blocked, the sound insulation performance of the composite material is increased, the composite material does generate gases harmful to human bodies under high temperature, performances such as high temperature resistance and tear resistance are perfectly fused, and the tear-resistant nano-modified rubber can be applied to various severe working conditions.
Owner:常熟市瑞思知识产权服务有限公司

Oil-resistant environment-friendly fiber-modified nano architectural substrate and preparation method thereof

The invention discloses an oil-resistant environment-friendly fiber-modified nano architectural substrate and a preparation method thereof. The oil-resistant environment-friendly fiber-modified nano architectural substrate is prepared from the following raw materials in parts by weight: 50-60 parts of nitrile-butadiene rubber, 30-40 parts of polyurethane rubber, 10-15 parts of methyl 12-hydroxystearate, 8-12 parts of magnesium methacrylate, 6-10 parts of vinyltris(methylethylketoximino)silane, 20-25 parts of nylon 66 short fiber, 5-10 parts of propylene glycol polyadipate and 10-16 parts of diethylene glycol bis allyl carbonate. The compound of the nitrile-butadiene rubber and polyurethane rubber has excellent oil resistance, favorable wear resistance, favorable aging resistance and favorable air tightness; the methyl 12-hydroxystearate, magnesium methacrylate, vinyltris(methylethylketoximino)silane and other aids constitute the bonding system and perform an important function on the bonding between the rubber and nylon 66 short fibers, thereby enhancing the hardness of the rubber product; and the added propylene glycol polyadipate and diethylene glycol bis allyl carbonate are matched to enhance the oil resistance and the temperature resistance of the rubber. By using p-tosyl semicarbazide, fluorocarbon-base silicone oil and 4,4-oxo-bis benzenesulfonyl hydrazide, the prepared material is in a slight foamed state, so the pore structure becomes finer and thicker. Structurally, fibrous membranes with different diameters and porosity are prepared, and the nano graphene for binding the layers improves the porosity and specific area of the compound adsorption membrane and enhances the efficacy.
Owner:常熟市瑞思知识产权服务有限公司

An anti-aging adjustable blood-drawing device

The invention discloses an anti-aging adjustable blood drawing device which comprises a base, wherein a moving slot is arranged at the top in the base; a first threaded rod is arranged in the moving slot; a moving block is sleeved on the surface at one end of the first threaded rod; a fixing column is arranged at the top of the moving block; a moving column is arranged at the top of the fixing column; a second threaded rod is arranged in the moving column. According to the invention, the fixing column, a first linear motion bearing, a rotating plate, the second threaded rod and the moving column are arranged for matching with each other in use, so that the advantages of convenience in adjusting the height of the fixing frame plate and enhancement for the efficient fixing for the patient hands at different heights can be achieved. The fixing frame plate, a mounting plate, a memory cotton block, a bearing block, a second linear motion bearing, a third threaded rod, a rotating plate and a spring are arranged for matching with each other in use, so that the advantages of convenience in moving the memory cotton block, enhancement for efficient fixing for the patient arms in different thickness and capability of relieving the tightening state of the patient arms can be achieved.
Owner:鄂东医疗集团市中心医院

Urea sampling device convenient for sampling urea in different stages

The invention discloses an anti-corrosion and anti-ageing urea sampling device. The urea sampling device comprises a collection hopper, wherein flow dividing pipes are arranged in the middles of two sides of the collection hopper and are connected through a collection tank, a liquid draining pipe is arranged at the bottom of the collection tank, a valve is arranged on one side of the liquid draining pipe, a fixed seat is arranged at the bottom end of the collection hopper, and a first liquid collection groove is formed in the top of the fixed seat. By virtue of mutual cooperation and use of the fixed seat, the first liquid collection groove, a rotating plate, a second liquid collection groove, a liquid separation plate, a liquid collection pipe, a liquid inlet, a liquid separation groove and a groove, the urea can be conveniently loaded in different urination stages of a human body, the inspection and comparison of an inspector are facilitated, and the data accuracy is increased; and by virtue of mutual cooperation and use of the collection hopper, the liquid collection pipe, the liquid separation plate, a first mounting groove, a second mounting groove and a mounting hole, the urea sampling device can be conveniently dismounted and mounted, and the extraction of urea is facilitated.
Owner:QINGDAO WOMEN & CHILDREN HOSPITAL

A urine sampler that is convenient for taking liquid in different stages

The invention discloses an anti-corrosion and anti-ageing urea sampling device. The urea sampling device comprises a collection hopper, wherein flow dividing pipes are arranged in the middles of two sides of the collection hopper and are connected through a collection tank, a liquid draining pipe is arranged at the bottom of the collection tank, a valve is arranged on one side of the liquid draining pipe, a fixed seat is arranged at the bottom end of the collection hopper, and a first liquid collection groove is formed in the top of the fixed seat. By virtue of mutual cooperation and use of the fixed seat, the first liquid collection groove, a rotating plate, a second liquid collection groove, a liquid separation plate, a liquid collection pipe, a liquid inlet, a liquid separation groove and a groove, the urea can be conveniently loaded in different urination stages of a human body, the inspection and comparison of an inspector are facilitated, and the data accuracy is increased; and by virtue of mutual cooperation and use of the collection hopper, the liquid collection pipe, the liquid separation plate, a first mounting groove, a second mounting groove and a mounting hole, the urea sampling device can be conveniently dismounted and mounted, and the extraction of urea is facilitated.
Owner:QINGDAO WOMEN & CHILDREN HOSPITAL

Expansion-proof fiber modified nano-adsorption building base material and preparation method for same

The invention discloses an expansion-proof fiber modified nano-adsorption building base material and a preparation method for the same. The expansion-proof fiber modified nano-adsorption building base material is prepared from the following raw materials in parts by weight: 50 to 70 parts of activated carbon, 12 to 20 parts of montmorillonite, 5 to 12 parts of nano-titania, 1 to 10 parts of gamma-aminopropyltriethoxysilane, 6 to 12 parts of hydroxy propyl methyl cellulose, 4 to 8 parts of nickel nitrate and the like. According to the expansion-proof fiber modified nano-adsorption building base material and the preparation method for the same, added nitrile rubber modified phenol-formaldehyde resin and the raw materials are mixed, and are cured when being heated, and the molten resin is rapidly turned from a linear structure to an unmolten three-dimensional structure under the action of methylene decomposed from hexamethylenetetramine, so that mechanical performance is improved, and the performance of resistance to high temperature and low expansion are achieved; chitosan molecules are positively charged to adsorb negatively charged bacteria, so that a bactericidal function is realized; structurally, fiber film layers with different diameters and porosities are prepared, and nano graphene between the layers is combined, so that the porosity and the specific surface area of a composite adsorption film are improved, and effects are enhanced.
Owner:SUZHOU RUI TE JIE CHEM PROD CO LTD
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