44results about How to "Improve thermal oxidation resistance" patented technology

The invention discloses a fire-resistance enhancing polypropylene material and a preparing method for the polypropylene material. The material comprises the following components and portions by weight: PP resin 100, halogen-free expanding fire retardant 50-75, enhancing modifier 15-75, and antioxidant 0.2-1.0, wherein, the fire retardant is a self-prepared built halogen-free expanding fire retardant, formed by physically mixing N-P fire retardant and polyorganoxiloxane in 1:0.1-1:0.3 by weight. The invention complexes N-P fire retardant of high fire resistance with a flame-resisting assistant, namely organic silicon, and improves the OI value of material. The product from the material will not frost on surface when storing for a long time, and 5-30% talcum powder or glass fiber can be added, so the invention thoroughly solves the shortcoming of prior product that the surface will frost if storing for a long time and no mineral filler can be added to increase the material strength, truly realizes halogen freedom, environmental friendliness, high strength and usability for a long term. The preparing process of the fire-resistance enhancing polypropylene is simple without adding any complex equipment.

A high-lustre polypropylene material and its production are disclosed. The material consists of polypropylene resin 100 proportion, filler nanometer calcium carbonate 25-35 proportion, dispersant 0.5-1.5 proportion, cross-linking agent diisopropylzene 0.1-0.5 proportion, beta-crystal nucleation agent 0.1-0.5 proportion, and antioxidant 0.1-0.5 proportion. It costs low, has better toughness and surface brightness on surface.

The invention provides a method for preparing a SiC coating on the surface of a graphite crucible by using an in-situ reaction method. The method comprises the following steps: burying a graphite crucible for the coating into silicon powder inside a graphite crucible for heating, so as to obtain a pre-action material, putting the pre-action material into a superaudio sensing heating furnace, and reacting for 60-90 minutes at 1,300 DEG C on the presence of inert gases. According to the method, the SiC coating which is uniform in thickness is generated through solid phase on the surface of the graphite crucible through in-site reaction, the method is simple in process, easy to control and beneficial for industrial production. The SiC coating prepared by using the method provided by the invention is solidly combined with a substrate of the graphite crucible, because of the SiC coating, the graphite crucible is effectively prevented from being oxidized, and the oxidation resistance and the thermal impact resistance of the graphite crucible are improved, so that the service life of the graphite crucible is prolonged, and no other impurities are introduced.

The invention discloses a preparation method of a heat-resistant oxygen-resistant polyester film. The preparation method is characterized by including the steps of preparation of hydroxy thiophenol containing compounds, preparation of sulfur-containing hindered phenol antioxidants, polyester synthesis and film processing. The preparation method includes: using 4-hydroxy benzyl thiophenol sodium, 1, 3, 5-trichlorobenzene, 1, 3, 5-tribromobenzene and 2, 4, 6-tri(4-hydroxy benzyl thiophenyl)-1, 3, 5-triazine to synthesize the hydroxy thiophenol containing compounds, namely, 1, 3, 5-tri(4-hydroxy benzyl thiophenyl) benzene and 2, 4, 6-tri(4-hydroxy benzyl thiophenyl)-1, 3, 5-triazine in N, N-dimethyl formamide solvent; synthesizing the 1, 3, 5-tri(4-hydroxy benzyl thiophenyl) benzene, the 2, 4, 6-tri(4-hydroxy benzyl thiophenyl)-1, 3, 5-triazine and 3, 5-di-tert-butyl-4-hydroxy phenylacrylic acid methyl ester to prepare the type A reactive sulfur-containing hindered phenol antioxidant and the type B reactive sulfur-containing hindered phenol antioxidant; and synthesizing the type A reactive sulfur-containing hindered phenol antioxidant, the type B reactive sulfur-containing hindered phenol antioxidant, terephthalic acid and ethylene glycol to prepare heat-resistant oxygen-resistant polyester resin, so that the heat-resistant oxygen-resistant polyester film good in performance is prepared.

The invention discloses polyphenylacetylene silicon oxide borane and a preparation method thereof. The structure of the prepared polyphenylacetylene silicon oxide borane is shown as a formula I, wherein R1 and R2 refer to CH3, C6H5, and n is 1-100. The preparation method comprises the following steps of: performing hydrogen chloride removal reaction on trichlorosilane and alkyl boric acid to obtain polychlorosilicon oxide borane; and reacting the polychlorosilicon oxide borane with phenylacetylenelithium to obtain the polyphenylacetylene silicon oxide borane. In the polymer, a repeat unit contains polyphenylacetylene, so the magnitude of the polymerization degree cannot influence the crosslinking density of the polymer. The molecular weight of the polymer can be controlled by proportioning raw materials. In high temperature environment, the surface of a material is vitrified, and a ceramic layer such as a silicon carbide layer or a boron carbide layer is formed, so that the inner material is isolated from heat and oxygen; therefore, the thermal oxidation performance of the structural material is improved. The polyphenylacetylene silicon oxide borane is applied to preparing ceramic precursors, high-performance composite material matrixes, ablation resistant materials, high temperature resistant coatings and the like. The formula I is shown in the specifications.

The invention belongs to the field of metal additive manufacturing, and particularly discloses a crack-free nickel-based superalloy and a component design method and a preparation method thereof. The crack-free nickel-based superalloy comprises the following components in percentage by mass: 10.50%-11.00% of Mo, 24.50%-25.30% of Cr, 1.00%-1.50% of W, 4.00%-4.50% of Co, 10.00%-11.00% of Fe, 0.05%-0.08% of C, 0.60%-0.80% of Mn, 0-0.30% of Si and the balance of Ni. According to the nickel-based superalloy, the rapid solidification effect of the selective laser melting forming technology can be fully utilized, the strength of the GH3536 alloy can be remarkably improved, meanwhile, the microcrack defect of a traditional nickel-based superalloy in the selective laser melting forming process is remarkably reduced, and the mechanical property is excellent.

The invention provides a thermal insulating pipe and a manufacturing method of the thermal insulating pipe. The thermal insulating pipe is composed of a crosslinked polyethylene layer, a polyethylene thermal insulating layer and an ultraviolet radiation resisting polyethylene layer which are arranged from inside to outside in sequence, wherein an electric heating device is arranged between the crosslinked polyethylene layer and the polyethylene thermal insulating layer. Compared with the existing split-type single piece water conveying thermal insulating pipe, the thermal insulating pipe is an integer composed of the crosslinked polyethylene layer, the polyethylene thermal insulating layer, the ultraviolet radiation resisting polyethylene layer and the electric heating device; firstly, the aging resistance performance of the thermal insulating pipe is improved by the ultraviolet radiation resisting polyethylene layer; secondly, as the thermal insulating pipe is an integer, no thermal insulating materials need to be wrapped, so that the use is convenient, and the working quantity during the installation process is reduced; thirdly, as the electric heating device is added, the electric heating can be carried out, so that the liquid is prevented from being refrozen in a low temperature environment; and moreover the crosslinked polyethylene layer is used as the inner layer of a water conveying pipe, and crosslinking can be carried out slowing by using the heat of the liquid, thus the heat-resisting oxidation susceptibility of the water conveying pipe is improved.

The invention relates to wear-resistant steel and belongs to the technical field of metal smelting. The wear-resistant steel is prepared from the following components in percent by mass: 0.88-0.94% ofC, 0.20-0.30% of Si, 0.90-1.00% of Mn, 0.50-0.60% of Cr, 0.20-0.60% of W, 0.10-0.25% of V, 2.50-3.00% of Zr, 0.010-0.050% of Ti, 0.020-0.050% of Y, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.25% of Cu and the balance of Fe and inevitable impurities. The wear-resistant steel has the beneficial effects that the problems of low strength and poor wear resistance of the existing low-carbon wear-resistant steel is solved; the wear-resistant steel is finer in crystal and fuller in internal density, and a grinding ball prepared by the wear-resistantsteel is larger in hardness and good in wear resistance.

The invention provides a laser cladding method for improving the abrasion resistance of a mechanical seal sleeve for a pump. The laser cladding method comprises the following steps: carrying out surface treatment on an abrasion resistance part of the mechanical seal sleeve; carrying out fusion covering on the abrasion resistance part subjected to surface treatment by using nickel-based composite powder through a laser, wherein the nickel-based composite powder comprises the following chemical components in percentage by mass: 0.5-1% of C, 14-19% of Cr, 3.5-5% of Si, 3-4.5% of B, 2-4% of Cu, 2-4% of Mo, 8-9% of Fe, 0.3-0.5% of CeO, 0.5-1% of Ti, 2.5-3.5% of W and the balance of Ni; and carrying out wet-type grinding on the mechanical seal sleeve subjected to fusion covering, detecting and processing. After the mechanical seal sleeve for the pump is modified by laser cladding, the hardness of the mechanical seal sleeve for the pump can reach HRC (Rockwell hardness) 72-76, and the mechanical seal sleeve for the pump is anti-abrasive and meanwhile resists various chemical media.

The invention relates to the technical fields of synthetic resin and plastic, and particularly relates to a preparation method of a polyphenyl thioether-organic montmorillonite composite material. The preparation method of the polyphenyl thioether-organic montmorillonite composite material comprises the following steps of (1), the preparation of organic montmorillonite; (2), the preparation of the polyphenyl thioether-organic montmorillonite composite material; (3), the heat treatment of the polyphenyl thioether-organic montmorillonite composite material. According to the polyphenyl thioether-organic montmorillonite composite material made by the preparation method, the chrominance change of polyphenyl thioether which is subjected to the heat treatment is ameliorated; the thermal oxidation resistance effect of the polyphenyl thioether is improved; the oxidation resistance effect of the composite material is better.

The invention discloses a heat-resisting silicone oil composite comprising silicone oil and metallocene base silazane which is shown as a formula (1); the mass fraction ratio of the silicone oil and the metallocene base silazane shown as the formula (1) is 100:(0.001 to 5); in the formula (1), M is selected from Fe and Ru; and R1, R2, R3 and R4 are all selected from methyl, ethyl, propyl, butyl, octyl, methoxyl, ethyoxyl, ethylene, phenyl, tolyl, chlorphenyl and naphthyl. In the heat-resisting silicone oil composite, the heat-resisting oxidizability of the silicone oil is improved, thermal degradation damage of a molecular chain is reduced, heat weightlessness of the silicone oil is reduced, and the silicone oil has better heat-resisting comprehensive performance.

The invention provides a low smoke zero halogen flame retardant crosslinking polyolefin jacket material. The low smoke zero halogen flame retardant crosslinking polyolefin jacket material comprises the following components in parts by weight: 55-65 parts of ethylene-vinyl acetate polymer, 35-50 parts of polyethylene, 5-8 parts of carbon black, 6-8 parts of melamine polyphosphates, 55-65 parts of modified aluminum hydroxide, 0.1-0.2 part of dicumyl peroxide, 1.5-2.0 parts of a silane coupling agent, 1-2 parts of barium stearate, 1-2 parts of polyethylene wax, 2-3 parts of talcum powder, 0.5-0.6part of a light stabilizer and 2-5 parts of an antioxidant, wherein the modified aluminum hydroxide is titanate modified aluminum hydroxide. The low smoke zero halogen flame retardant crosslinking polyolefin jacket material makes the thermal oxidation resistance and flame retardant capability of the material be greatly improved, and meanwhile has the good mechanical performance. The invention further provides a preparation method of the low smoke zero halogen flame retardant crosslinking polyolefin jacket material, and the preparation method is reasonable in design, easy and convenient to operate, high in raw material utilization rate and can easily achieve industrialized production.

The invention relates to the technical field of brake materials, in particular to a friction material, an organic carbon-ceramic brake pad for a light-weight carbon-ceramic plate prepared from the friction material, as well as a preparation method and application thereof. The organic carbon-ceramic brake pad for the light-weight carbon-ceramic plate is prepared from the following raw materials including, by weight, 2 to 4 parts of basalt fiber, 10 to 15 parts of steel fiber, 5 to 10 parts of mineral fiber, 8 to 12 parts of phenolic resin, 5 to 10 parts of elastic particles, 6 to 10 parts of cashew nut oil friction powder, 10 to 20 parts of precipitated barium sulphate, 1 to 3 parts of acrylic fiber, 2 to 4 parts of silicon carbide, 6 to 11 parts of kieselguhr and 9 to 12 parts of glass beads. The preparation method is pressing and thermosetting forming. The organic carbon-ceramic brake pad for the light-weight carbon-ceramic plate provided by the invention is stable in structure, goodin heat resistance and friction performance, simple in preparation process, and short in preparation period, and has good compatibility with the light-weight carbon-ceramic plate and good practicability so as to form a light-weight friction pair, so that the light weight of a vehicle can be effectively realized.

The invention discloses an oxidation-resistant high-heat-conductivity maleic-anhydride-grafted polyphenyl ether modified epoxy resin composite material for LED packaging. According to the composite material, epoxy resin is modified through grafted polyphenyl ether; the polyphenyl ether obtained after maleic anhydride, nano titania and other raw materials are grafted maintains the excellent properties of low dielectric, low loss and high heat resistance, compatibility between the polyphenyl ether and the epoxy resin is improved, and the defects of traditional epoxy resin serving as a packaging material are effectively overcome; added nano copper and aquadag powder are good in adhesiveness, improve the heat conducting capacity, heat dissipating capacity and heat oxidation resisting capacity of the composite material, delay heat ageing of the material and also can shield certain electromagnetic radiation and delay ageing of the material. Serving as an LED packaging material, the prepared modified composite epoxy resin is excellent in overall performance, long in service life, more economical and more durable.

The invention belongs to the field of organic high molecular compounds, and relates to a polypropylene composite material as well as a preparation method and use thereof. The polypropylene composite material is prepared from the following components in parts by weight: 80-100 parts of polypropylene, 10-20 parts of thermoplastic elastomers, 8-12 parts of low density polyethylene, 8-12 parts of inorganic filler, 5-8 parts of crystal whiskers, 0.3-0.6 part of an antioxidant, 0.3-0.6 part of oxidized polyethylene wax, 2-4 parts of polypropylene-grafted maleic anhydride and 0.1-0.3 part of a coupling agent. The polypropylene composite material disclosed by the invention can be used for preparing steering wheels. The product produced by using the composite material has the advantages of uniform surface gloss, uniform color, comfortable feel, good stress cracking resistance, good comprehensive mechanical property and the like.

The invention discloses a thermal oxidation stable polyformaldehyde preparation method, and belongs to the technical field of chemical industry. According to the method, an aluminum alloy and cellulose acetate are compounded to prepare composite metal resin, cutting grains are extruded and grinded into compound aluminum resin powder, and the compound aluminum resin powder and the cellulose acetateare dissolved by diethyl ether in the polymerization process to form a porous aluminum base material. According to the method, rice hulls can be activated through reaction by zinc powder and iron powder at high temperature, lignocellulose components are swelled and gradually transformed into a gummy matter under the action of organic metal solution, the recrystallization temperature of aluminum alloy can be increased by manganese, recrystallization grains are thinned, growth of the thinned recrystallization grains is hindered by compound dispersoid particles, so that the aluminum alloy acquires more force bearing points when external acting force is applied on the aluminum alloy, the aluminum alloy is dispersed, ferromanganese iron metal elements are added into the aluminum alloy, montmorillonoid is adsorbed on gaps of the aluminum alloy, the aging effect of ultraviolet light on polyformaldehyde is reduced, and the mechanical property of the polyformaldehyde is improved.

The invention relates to the technical field of transmission triangular belts, in particular to a preparation method of graphene-based thermal-oxidation-resistant V-belt coated composite rubber. The preparation method comprises the steps that graphene is dispersed in slurry formed by chloroprene rubber and gradually forms microchip zinc hydroxide in zinc salt, so that the graphene slurry adheres to the surface of the microchip zinc hydroxide in situ; the temperature is increased, inorganic fiber is added, and the microchip zinc hydroxide is gradually decomposed and converted into microporous zinc oxide, so that the graphene closely stays and is compounded in micropores of the microporous zinc oxide and is wrapped with an inorganic fiber macroscopic interface; the obtained compound micro powder of zinc oxide and graphene adheres to the inorganic fiber and can be effectively dispersed in the rubber to serve as V-belt coating glue through carrying of the inorganic fiber. The thermal oxidation resistance is greatly improved, and the strength of a V-belt is improved, so that the V-belt is suitable for being used in high-load and high-temperature environments.