73results about How to "Improve heat and oxygen aging resistance" patented technology

The present invention relates to composite heat resisting antioxidant for polyolefin and its production process and application. The composite heat resisting antioxidant consists of hindered phenol antioxidant 20-75 wt%, phosphate antioxidant 20-75 wt%, and chelating metal component containing at least bisamide-metal ion chelating structure 5-50 wt%, and is prepared through physical mixing and airflow crushing. The composite heat resisting antioxidant is applied in polyolefin product and can raise the ageing resisting performance of polyolefin product, especially greenhouse film, greatly.

The invention provides a aging resistance protection glue at tire side-wall and seam allowance part, which comprises components of natural rubber, brominated butyl rubber, high cis-butadiene rubber, ethylene-propylene diene copolymer, butyl reclaimed rubber, carbon black, eleaostearic acid, zinc oxide, octyl-phenolic tackifying resin, a hydrocarbon resin mixture, protection wax, naphthenic oil, sulphur and a promoter; and discloses a preparation method of the above rubber compound and an application method. The method changes a mode that the traditional rubber compound raw rubber system at the side-wall and seam allowance part rubber compound raw rubber system employs a combination mode of natural rubber and high cis-butadiene rubber, brominated butyl rubber with good aging resistance performance and high molecular chain saturation as well as high cis-butadiene rubber are added, a sulfuration system is optimized, thermo-oxidative aging resistance of the rubber compound can be increased, ozone aging resistance is increased; aging and cracking problems generated at the tire side-wall and seam allowance part can be avoided, tire usage security is increased, and refurbishment time of tire is increased.

The invention provides a modified ABS automobile special material comprising the following components in the formula in parts by weight: 100 parts of resin matrix ABS, 5-15 parts of active filler hollow microsphere, 4-8 parts of high rubber powder ABS, 0.5-0.8 part of age resister and 2-4 parts of master batch. In the above formula composition, the matrix resin ABS is granular substance; the active filler hollow microsphere is processed by silane coupling agent KH 550; the age resister mainly comprises master antioxidant, slave antioxidant and uvioresistant agent which are all powdery substance; the color of the master batch is determined according to product requirements, and the master batch is granular substance. The invention utilizes the principle that solubility parameters are similar; other polymers and various auxiliary agents, such as age resister, flexibilizer, fillers and the like are added into the ABS material and carry out molten mechanical mixing at certain temperature so as to obtain a new material applied on lorry parts.

The invention discloses an addition type liquid silicone rubber with high transparency and resistance to thermo-oxidative aging, and a preparation method thereof. The addition type liquid silicone rubber comprises the following raw materials by mass: 100 parts of vinyl silicone oil, 30 to 50 parts of white carbon black, 5 to 7 parts of hexamethyldisilazane, 1 to 5 parts of hydrogen-containing silicone oil, 1 to 5 parts of metal hybrid cage silsesquioxane, 5 to 20 ppm of a platinum catalyst and 0.03 to 0.07 part of 1-ethynyl-1-cyclohexanol. The preparation method comprises the following steps:subjecting vinyl silicone oil, white carbon black and hexamethyldisilazane to high-temperature mixing with a vacuum kneader, and then carrying out cooling and grinding with a three-roll grinder so asto obtain masterbatch; and then adding metal hybrid cage silsesquioxane, hydrogen-containing silicone oil, 1-ethynyl-1-cyclohexanol, the platinum catalyst and the like into the masterbatch, and then carrying out mechanical mixing and vulcanization so as to obtain the addition type liquid silicone rubber. The prepared silicon rubber of the invention has excellent resistance to thermo-oxidative aging, high transparency and good mechanical properties, and can be applied to fields such as aerospace and aviation, the nuclear power industry, electronic appliances and medical equipment.

The invention relates to the field of rubber materials, and provides compound rubber and a preparation method thereof for the problem of poor ozone-aging resistance. By adoption of the compound rubberand the preparation method, the ozone-aging resistance can be better improved. The invention adopts the following technical scheme that the compound rubber is prepared from the following raw materials in parts by mass: 20-50 parts of polyurethane, 50-80 parts of butadiene-acrylonitrile rubber, 4-8 parts of plasticizer, 20-50 parts of white carbon black, 0.5-3 parts of silane coupling agent, 40-60parts of flame retardant, 1.5-4 parts of crosslinking agent and 6-10 parts of clay. The method for preparing the compound rubber comprises the following steps: (1) mixing of masterbatch; (2) vulcanization of the masterbatch: prolonging the coagulation time of the masterbatch in a stage of no addition of the crosslinking agent. (3) vulcanization. The compound rubber and the preparation method provided by the invention have the beneficial effects that oil resistance is provided by acrylonitrile in the butadiene-acrylonitrile rubber, flame retardance is provided by the flame retardant, and better ozone-aging resistance is provided by the polyurethane; by prolonging of the coagulation time of the masterbatch in the stage of no addition of the crosslinking agent in a mixing machine, the clay can be better dispersed in mixed rubber, so that the ozone-aging resistance of the compound rubber can be improved.

The invention relates to a preparation method of a weather-resistant bamboo-plastic composite material, and belongs to the technical field of bamboo-plastic materials. The method comprises the steps that ethyl orthosilicate is hydrolyzed to form a sol to coat the surface of a bamboo powder material, so that surface grooves of the bamboo powder material are gradually filled with a coating, shallowgrooves are filled to be leveled, thereby effectively reducing the contact area and contact time between the surface of the bamboo powder material and oxygen., and the sol formed by coating is dried to form a shell due to the loss of moisture of the sol and the volatilization of partial substances in gel, thereby effectively improving the mechanical properties of the material; the modification isachieved through the hydrolysis and coating of the ethyl orthosilicate, the effective load of silica sol on the surface of the bamboo powder material is effectively combined with polyvinyl chloride, amorphous regions of a polyvinyl chloride polymer chain are filled with inorganic silica particles, so that the heat transfer is reduced, the thermal decomposition of the polymer chain is inhibited toa certain extent, thereby effectively improving the heat-resistant oxygen aging property of the bamboo-plastic composite material, and further modifying the weather resistance of the bamboo-plastic composite material.

The invention relates to a polyolefin composition, particularly to a thermo-oxidative-aging-resistant impact-resistant polypropylene composition and a preparation method thereof. The composition comprises the following raw materials: 88 to 97 parts of a polypropylene powder resin, 3 to 12 parts of metallocene linear low density polyethylene mLLDPE, 0.05 to 0.1 part of an antioxidant A, 0.05 to 0.1part of an antioxidant B, 0.03 to 0.07 part of a degradation agent, 0.02 to 0.08 part of an antistatic agent, and 0.02 to 0.1 part of an acid absorption agent, wherein the sum of the polypropylene powder resin and the metallocene linear low density polyethylene mLLDPE is 100 parts, the antioxidant A is mercaptan acrylate and has the number-average molecular weight of 1305, and the antioxidant B is tri(2,4-di-tert-butylphenyl) phosphite, and has the number-average molecular weight of 647. The preparation method comprises the following steps: uniformly mixing the raw materials, and carrying outtwin-screw extrusion granulation to obtain the polypropylene composition with good heat resistance, good impact resistance and good flowability.

The invention discloses a glass fiber reinforced polypropylene composite material with high thermo-oxidative aging resistance and a preparation method of the glass fiber reinforced polypropylene composite material. The glass fiber reinforced polypropylene composite material is prepared from components in parts by weight as follows: 70-80 parts of polypropylene homopolymers, 20-30 parts of glass fiber, 4-6 parts of a compatilizer, 0.5-0.8 parts of zinc oxide and 0.6-1 part of an antioxidant, wherein the compatilizer is one of CMG9801, BONDYRAM 1001 or KT-1. By addition of the compatilizer, zincoxide and the antioxidant to the glass fiber reinforced polypropylene composite material and adoption of a reasonable ratio, weather resistance of the material can be substantially improved, and prepared glass fiber reinforced polypropylene has higher performance retention rate after thermo-oxidative aging and is suitable for certain places with relatively strict requirements for the thermo-oxidative aging.

The invention discloses a PC/ABS alloy material for household appliances. The composite material comprises the following raw materials in parts by weight: 55-70 parts of PC resin, 18-40 parts of ABS resin, 5-15 parts of a straw biochar material, 6-10 parts of a compatible toughening agent, 0.2-0.8 part of an antioxidant, 0.3-1.0 part of a lubricant, 0.5-1.0 part of modified lignin, 1-5 parts of anantibacterial agent and 5-15 parts of a flame retardant. By adding the modified lignin, the ageing resistance of the PC/ABS alloy material is improved while good electromagnetic shielding performanceis kept.

The invention relates to a color rubber synchronous belt and a preparation method thereof. The synchronous belt comprises a synchronous belt skeleton and a rubber sheet attached to the outer surface of the synchronous belt in a wrapping manner, wherein the raw material of the rubber sheet comprises the following components in parts by weight: 20 to 40 parts of saturated Buna-N rubber, 30 to 50 parts of thiol chloroprene rubber, 20 to 40 parts of chlorinated butadiene styrene rubber, 4 to 8 parts of methacrylic acyloxy silane, 30 to 50 parts of reinforced resin, 5 to 6 parts of cross-linking agent, 2 to 6 parts of burnishing master batch, 0.5 to 1.5 parts of curing agent, 8 to 12 parts of plasticizer, 1 to 3 parts of anti-aging agent, 3 to 7 parts of telechelic polymer and 5 to 7 parts of homogeneous agent. Through adding various colors of burnishing master batch, the color of the synchronous belt is different from the black color in the past, and is more bright and eye-catching, and better wear-resisting and heat-resisting performances are realized.

The invention belongs to the technical field of rubber materials, and particularly relates to a preparation method of an automobile pipeline rubber material. The preparation method comprises the steps of S1, preparing the following raw materials in parts by weight: 60-100 parts of fluororubber, 1-2 parts of high wear-resistant carbon black, 40-50 parts of semi-reinforced carbon black, 2-6 parts of zinc oxide, 4-6 parts of magnesium oxide, 0.5-1 part of an anti-aging agent, 2-6 parts of an accelerant, 1-4 parts of stearic acid, 1-2 parts of an antioxidant and 2-4 parts of a vulcanizing agent. Through introduction of fluorine atoms in the fluororubber, the rubber is endowed with excellent heat resistance, oil resistance and corrosion resistance, the wear resistance of the rubber can be enhanced through the high-wear-resistance carbon black, the overall strength of the rubber is guaranteed through the semi-reinforcing carbon black, magnesium oxide and zinc oxide mainly play a role in fluidity and oxidation resistance in the rubber, the tensile strength and the impact resistance of the rubber are improved, the anti-aging agent can improve the thermal oxygen aging resistance of the rubber, and the accelerant can promote the reaction between the rubber and the vulcanizing agent, so that the vulcanization reaction speed is increased.

The invention relates to the field of polypropylene foam materials, and discloses a foamed polypropylene composition, a foamed polypropylene plate and a preparation method thereof. The composition isprepared from the following components in parts by weight: 100 parts of high-melt-strength polypropylene, 0.05 to 2 parts of guanidine salt composite antibacterial agent, 0.05 to 5 parts of mildew preventive and 1 to 15 parts of foaming agent, wherein the high-melt-strength polypropylene is prepared from the following components in parts by weight: 100 parts of polypropylene, 0.1 to 0.3 part of antioxidant and 0.25 to 10 parts of mixed butene-maleic anhydride copolymer microspheres, wherein the particle size of the copolymer microspheres is 0.1-10 [mu] m. The foamed polypropylene which is compact in foam hole, uniform in pore size distribution, smooth in surface, high in thermo-oxidative aging resistance and capable of being recycled in a non-crosslinking mode can be prepared in an extrusion molding mode.

The invention discloses anti-static polyformaldehyde, which comprises the following raw materials in parts by weight: 100 parts of polyformaldehyde, 5-12 parts of oleic acid polyglycol ester, 3-8 parts of dimethyl hydroxyethyl stearamide-ethyl quaternary ammonium nitrate, 3-8 parts of polyethylene glycol terephthalate, 4-10 parts of copolymer nylon, 5-12 parts of magnesium oxide, 3-10 parts of copper powder, 2-6 parts of an antioxidant, 1-4 parts of a light stabilizer and 1-10 parts of a lubricating agent. An antistatic component and the polyformaldehyde have appropriate compatibility; the condition that a proper amount of antistatic component migrates to the surface from the inside of the polyformaldehyde is ensured to reach certain surface concentration; when the antistatic component on the surface is washed by a solvent or removed by friction in use, the antistatic component in the polyformaldehyde can further migrate outwards to restore the antistatic effect; the antistatic property is good, lasting and stable; and the problem of intense decomposition of POM in the molding and processing processes can be effectively solved, so that the thermal-oxidative-ageing property of the polyformaldehyde is improved; and the tensile strength and the breaking elongation are improved.

The invention discloses an automobile exterior trimming special material prepared from a TPO skin reclaimed material and a preparation method thereof. Raw materials comprise: a TPO skin reclaimed material, copolymerized PP, a molecular weight regulator, a flexibilizer, a compatilizer, a weather-resistant agent, a filler, an antioxidant and a colorant. The preparation method comprises the followingsteps: mixing and stirring the TPO skin reclaimed material and the molecular weight regulator, adding the copolymerized PP, the flexibilizer, the weather-resistant agent, the compatilizer, the antioxidant, the filler and the colorant, mixing and stirring the components; and feeding the mixture into a double-screw extruder for perfomring extrusion, cooling, drying and granulation. The TPO skin regenerated material is creatively applied to production of special materials for automobile exterior decorations such as automobile fenders and wheel covers, so that the product can completely meet theworking condition performance requirements of the automobile exterior decorations such as the automobile fenders and the wheel covers, so that high-impact-resistance PP or PE materials are replaced, the problems of resource waste, environmental pollution and the like can be relieved, the production cost can be effectively reduced, and economic benefit is increased.