39results about How to "Reduce thermal aging" patented technology

The invention relates to the field of silicone rubber materials and particularly relates to a preparation method of high-performance mould-press type mixed silicone rubber. The preparation method comprises the following steps: matching raw materials, kneading the raw materials, curing the rubber material, introducing steam, and performing vacuumizing treatment. The tensile strength, the tear strength, the elongation and other parameters of a rubber product produced by the silicone rubber after treatment by vulcanization are obviously improved, the thermal aging permanent deformation parameter is also in a relatively small range, and the comprehensive mechanical properties are further improved.

A new process for producing a fiber-reinforced thermoplastic resin molded product with a high mechanical strength and no heat substantial deterioration of the resin, by an efficient heating without applying shear stress to the fiber-reinforced thermoplastic resin base material and a molded product, for example, a tiptoe core for a safety shoe produced by said process are provided. The fiber-reinforced thermoplastic resin base material P1 in a string form or a tape form is scattered and accumulated in a vessel such as tube 11, and a heating gas passed to the accumulated base material to melt heat, and preferably press by a plunger 15, the base material P1, whereby a molten mass P2 is formed, and then the molten mass P2 is dislocated to a mold to be press-mold. Said base material preferably satisfies the following formula: {fraction (1 / 100<=RHO1 / rho0<= 1 / 2 , wherein rho0 means a density where said base material is scattered and accumulated and rho0 means a true density of said base material.

The invention discloses sulfur emulsified asphalt and a preparation method thereof. The sulfur emulsified asphalt is in a water-in-oil type and comprises the following components by weight: 30-97% of matrix asphalt, 0.9-34% of water, 1-6% of emulsifier and 1-30% of sulfur. The preparation method comprises the following steps: the emulsifier is added into the matrix asphalt in a melted state and is uniformly mixed, a certain amount of water is slowly dripped into the matrix asphalt containing the emulsifier and is uniformly mixed, water is dispersed in the asphalt containing the emulsifier in a fine micro-ball state, and then water-in-oil emulsified asphalt is formed; then sulfur is added into the water-in-oil emulsified asphalt and mixed uniformly and has a full reaction with the asphalt to obtain the sulfur emulsified asphalt. The high-temperature stability of the sulfur emulsified asphalt is good, the preparation temperature of the sulfur emulsified asphalt and the mix temperature of an asphalt mixture are low, the anti-track performance of the mixture is good, volatilization of harmful gas and a thermal aging phenomenon of asphalt are reduced, and the sulfur emulsified asphalt and the preparation method are environment-friendly and save energy.

The invention discloses a preparation method of a high-voltage and ultrahigh-voltage cable insulating material. The preparation method comprises the following steps: (1) compressing an ethylene monomer, carrying out high-pressure polymerization in a reactor to obtain low-density polyethylene, separating by a high-pressure separator and a low-pressure separator, cooling the low-density polyethylene, directly feeding into a single-screw extruder, adding a liquid antioxidant, uniformly dispersing the liquid antioxidant into low-density polyethylene, filtering through a high-mesh filter screen, and granulating to obtain low-density polyethylene containing the antioxidant; and (2) dedusting and grading the antioxidant-containing low-density polyethylene, adding a cross-linking agent by adoptinga post-permeation method, fully stirring, putting into an absorption bin, keeping the temperature, cooling, dedusting, removing impurities, and carrying out metal filtration to obtain the high-voltage and ultrahigh-voltage cable insulating material. According to the method provided by the invention, secondary melting processing of low-density polyethylene is avoided, thermal aging of resin is reduced, the cleanliness and the stability of the insulating material are improved, and the method is high in production efficiency, low in cost and convenient to popularize and apply.

The invention discloses warm mixed modified asphalt. The asphalt comprises a warm mixing agent, a polymer, basic asphalt and sulphur. The warm mixing agent is prepared by carrying out hydro-conversion on an F-T synthesis product as a raw material under action of a catalyst and carrying out special sweating on the hydrogenation product. Airflows pass through a material layer and carry away a liquid component in the sweating process so that separation effects of a solid component and the liquid component are improved and a separation rate is accelerated. Gas produced by inorganic salt decomposition forms micro-spaces in the material layer so that the liquid component fast outflows. The warm mixed modified asphalt has a low use temperature, high thermal stability and good heat aging resistance, reduces the heat aging of asphalt and reduces harmful gas.

A new process for producing a fiber-reinforced thermoplastic resin molded product with a high mechanical strength and no heat substantial deterioration of the resin, by an efficient heating without applying shear stress to the fiber-reinforced thermoplastic resin base material and a molded product, for example, a tiptoe core for a safety shoe produced by said process are provided. The fiber-reinforced thermoplastic resin base material P1 in a string form or a tape form is scattered and accumulated in a vessel such as tube 11, and a heating gas passed to the accumulated base material to melt heat, and preferably press by a plunger 15, the base material P1, whereby a molten mass P2 is formed, and then the molten mass P2 is dislocated to a mold to be press-mold. Said base material preferably satisfies the following formula: {fraction (1 / 100<=RHO1 / rho0<= 1 / 2 , wherein rho0 means a density where said base material is scattered and accumulated and rho0 means a true density of said base material.

The invention discloses an environment-friendly lubricating grease with high lubricating performance, comprising the following raw materials in parts by weight: 85 parts of base oil, 20 parts of 12-hydroxystearic acid, 8 parts of lithium hydroxide powder, and 1 part of composite heat stabilizer , 0.4 part of auxiliary heat stabilizer, 0.5 part of carboxymethyl cellulose, 1 part of sodium dodecyl sulfate, 1 part of sodium dodecyl benzene sulfonate, 0.3 part of antioxidant, 0.3 part of graphite and 0.3 part of glycerin; Among them, the base oil is made by mixing epoxidized soybean oil and chlorinated paraffin with a mass ratio of 7:3, the composite heat stabilizer includes peanut oil and tea tree oil with a mass ratio of 2:1, and the auxiliary heat stabilizer includes a mass ratio of 3 :2:2 calcium silicate, zinc oxide and aluminum oxide. At the same time, a preparation method of an environment-friendly lubricating grease with high lubricating performance is provided. The lubricity provided by the invention has high lubricating performance, good biodegradability and little environmental pollution.

The invention discloses a warm mixing hard asphalt mixture and a preparation method thereof. The warm mixing hard asphalt mixture comprises the following components in parts by weight: 4.0-6.0 parts of warm mixing hard asphalt, 1.0-3.0 parts of mineral powder and 91.0-95.0 parts of aggregates. The warm mixing hard asphalt comprises the following components in parts by weight: 0.5-7 parts of a warm mixing agent and 93-99.5 parts of matrix asphalt. The preparation method of the warm mixing agent comprises the following steps: under the effect of a catalyst, reacting macromolecular alkane with halogen simple substances to obtain a midbody; evenly mixing aromatic oil with a complex to obtain an aromatic complex component; and reacting the aromatic complex component and the midbody at a certain temperature to obtain the warm mixing agent used in the invention. The warm mixing hard asphalt used in the warm mixing hard asphalt mixture contains the warm mixing agent, the warm mixing effect can be achieved, the high-temperature performance and low-temperature performance of the asphalt are considered, the generation amount of harmful gas is reduced, the caking property of the asphalt is improved, the heat stability of the asphalt can be improved, and the anti-ageing performance is also improved.

The invention discloses a maleic anhydride-grafted polyphenyl ether modified epoxy resin composite used for LED packaging. A polyphenyl ether material obtained after grafting by raw materials like maleic anhydride and nanometer titanium dioxide maintains excellent low dielectric performance, low loss and high heat resistance and has improved compatibility with epoxy resin, so the defects of the epoxy resin as a packaging material are effectively improved; blended talcum powder having undergone surface roughening by hydrofluoric acid has a greater contact surface with the resin and better adsorptivity and can improve ultraviolet resistance and toughness of the composite; and added nanometer zirconia further improves the thermal conduction speed of the composite, enhances thermal oxidation resistance of the resin and alleviates thermal ageing. The composite prepared in the invention has excellent mechanical properties and dielectric properties, long service life, economic performance and durability when used as an LED packaging material.

The invention provides warm-mixed colorful synthetic asphalt and a preparation method thereof. The warm-mixed colorful synthetic asphalt is prepared from the following components in parts by mass: 1-7parts of warm mixing agent, 88-97 parts of synthetic asphalt and 2-5 parts of a coloring agent. A preparation method of the warm mixing agent comprises the following steps: firstly, enabling high molecular alkane to react with a halogen element in presence of a first catalyst to obtain an intermediate; evenly mixing first aromatic hydrocarbon oil with a complex to obtain an aromatic hydrocarbon complex component; then, mixing the aromatic hydrocarbon complex component with the intermediate for carrying out a reaction to obtain the warm mixing agent. The warm0mixed colorful synthetic asphalt is not only low in use temperature, but also can improve the heat stability and heat aging resistance of the asphalt, so that colorful asphalt pavement is bright in colorful, and the service life of the colorful asphalt pavement is prolonged.

The invention provides a warm mix hard asphalt, and a preparation method thereof. The warm mix hard asphalt comprises, by mass, 0.5 to 7 parts of a warm mixing agent, and 93 to 99.5 parts of matrix asphalt. The preparation method comprises following steps: under the action of a catalyst, a high-molecular alkane is reacted with a halogen elementary substance at a certain temperature under a certain pressure so as to obtain an intermediate; an aromatic hydrocarbon oil and a complex are uniformly mixed so as to obtain an aromatic hydrocarbon complex compound; the aromatic hydrocarbon complex compound and the intermediate are reacted at a certain temperature so as to obtain the warm mixing agent. The warm mixing agent added in the warm mix hard asphalt is capable of realizing warm mixing of asphalt, giving consideration to the high and low temperature performance of asphalt, increasing thermal stability of asphalt, improving aging resistance, reducing application temperature of asphalt, reducing generation amount of harmful gas, and improving the cohesiveness of asphalt.

The invention discloses a warm mix polymer modified asphalt and a preparation method thereof, wherein the warm mix polymer modified asphalt comprises, by mass, 1-7 parts of a warm mix agent, 2-5 parts of a polymer, 88-97 parts of matrix asphalt, and sulfur, and the sulfur accounts for 0.01-0.07% of the total mass of the warm mix agent, the polymer and the matrix asphalt. The warm mix agent preparation method comprises: under the effect of a catalyst, carrying out a reaction on a macromolecule alkane and an elemental halogen at a certain temperature under a certain pressure to obtain an intermediate; carrying out a reaction on an aromatic hydrocarbon oil and a complexing compound under the effect of a catalyst to obtain an aromatic hydrocarbon complexing component; and carrying out a reaction on the aromatic hydrocarbon complexing component and the intermediate at a certain temperature, and aging to obtain the warm mix agent. According to the present invention, with the warm mix agent, the warm mix effect is provided for the asphalt, the high temperature performance and the low temperature performance of the asphalt are considered, the thermal stability of the asphalt is improved, the aging resistance is improved, the thermal aging of the asphalt is reduced, and the harmful gas generation is reduced.

The invention discloses a warm mix hard asphalt mixture and a preparation method thereof, wherein the warm mix hard asphalt mixture comprises 4.0-6.0 parts of a warm mix hard asphalt, 1.0-3.0 parts of ore powder, and 91.0-95.0 parts of an aggregate, and the warm mix hard asphalt comprises 0.5-7 parts of a warm mix agent and 93-99.5 parts of matrix asphalt. The warm mix agent preparation method comprises: under the effect of a catalyst, carrying out a reaction on a macromolecule alkane and an elemental halogen to obtain an intermediate; carrying out a reaction on an aromatic hydrocarbon oil and a complexing compound under the effect of a catalyst to obtain an aromatic hydrocarbon complexing component; and carrying out a reaction on the aromatic hydrocarbon complexing component and the intermediate at a certain temperature, and aging to obtain the warm mix agent. According to the present invention, the warm mix hard asphalt used in the warm mix hard asphalt mixture contains the warm mix agent, such that the warm mix effect can be provided, the high temperature performance and the low temperature performance of the asphalt are considered, the harmful gas generation is reduced, the adhesion of the asphalt is improved, the thermal stability of the asphalt is improved, and the aging resistance is improved.

The invention discloses a hard asphalt mixture, which is made of the following components in parts by weight: 4.2-4.8 parts of modified hard asphalt, 92-94 parts of aggregate, 1.0-1.2 parts of mineral powder, modified hard asphalt Asphalt is made of modifier and base asphalt in a weight ratio of 3:7, and the modifier is prepared by the following steps: 1 weight part of nanometer hydrotalcite powder is added to 5 weight parts of ethylene glycol to disperse, and the pH value is adjusted to 4.0 , to obtain a slurry; 2 parts by weight of benzoic acid were dissolved in 5 parts by weight of ethylene glycol, the slurry was added dropwise, stirred and reacted at 130°C for 2h, filtered with suction, the supernatant was washed with water until neutral, and dried to obtain Modified nano hydrotalcite powder: Mix modified nano hydrotalcite powder, phenolic resin and oxidized polyethylene wax in a weight ratio of 2:7:3, extrude through a twin-screw extruder, and granulate to obtain the product. The invention has the advantages of reducing the mixing temperature of the hard asphalt mixture, improving high and low temperature performance, and the like.

The invention provides warm-mixed polymer modified asphalt and a preparation method thereof. The asphalt is prepared from components in parts by mass as follows: 1-7 parts of a warm-mixing agent, 2-5 parts of a polymer, 88-97 parts of substrate asphalt as well as sulfur accounting for 0.01%-0.07% of the total mass of the three components. The warm-mixing agent is prepared with the following method: under the action of a catalyst, high polymer alkane firstly reacts with elementary halogen at a certain temperature and under certain pressure to produce an intermediate; aromatic oil and a complex are uniformly mixed to form an aromatic complex component; then the aromatic complex component reacts with the intermediate at a certain temperature to produce the warm-mixing agent. The warm-mixing agent used in the warm-mixed polymer modified asphalt can have a warm-mixing effect on asphalt, considers high / low-temperature performance of asphalt and can improve the thermal stability of asphalt, improve aging resistance, reduce thermal ageing of asphalt and decrease harmful gas production.

The invention discloses sulfur emulsified asphalt and a preparation method thereof. The sulfur emulsified asphalt is in a water-in-oil type and comprises the following components by weight: 30-97% of matrix asphalt, 0.9-34% of water, 1-6% of emulsifier and 1-30% of sulfur. The preparation method comprises the following steps: the emulsifier is added into the matrix asphalt in a melted state and is uniformly mixed, a certain amount of water is slowly dripped into the matrix asphalt containing the emulsifier and is uniformly mixed, water is dispersed in the asphalt containing the emulsifier in a fine micro-ball state, and then water-in-oil emulsified asphalt is formed; then sulfur is added into the water-in-oil emulsified asphalt and mixed uniformly and has a full reaction with the asphalt to obtain the sulfur emulsified asphalt. The high-temperature stability of the sulfur emulsified asphalt is good, the preparation temperature of the sulfur emulsified asphalt and the mix temperature of an asphalt mixture are low, the anti-track performance of the mixture is good, volatilization of harmful gas and a thermal aging phenomenon of asphalt are reduced, and the sulfur emulsified asphalt and the preparation method are environment-friendly and save energy.