275results about How to "Improve thermo-oxidative stability" patented technology

An embodiment of a phase change TIM of this invention comprises a polyester matrix with melting temperature near or below operating temperature (typically less than about 130° C.), thermally conductive filler with bulk thermal conductivity greater than about 50 W/mK, and optionally other additives. The polyester resin has improved thermo-oxidative stability compared to the polyolefin resins, thereby providing improved reliability performance during test.

The invention relates to high-temperature resistant flame-retardant epoxy glue and a preparation method of the high-temperature resistant flame-retardant epoxy glue. The epoxy glue is a double-component epoxy glue; when the epoxy glue is used, a first component and a second component are mixed in a weight ratio of 4:(2-3); the first component is prepared from the following raw materials in parts by weight: 30-50 parts of polyfunctional epoxy resin, 5-15 parts of low-viscosity epoxy resin, 3-10 parts of an active toughening agent, 10-30 parts of temperature-resistant reinforcing fillers, 10-15 parts of flame retardant and 0.3-3 parts of antioxidant; the second component is prepared from the following raw materials in parts by weight: 70-95 parts of a temperature-resistant curing agent, 10-30 parts of temperature-resistant reinforcing fillers and 0.3-1 part of a coupling agent. Compared with the prior art, the high-temperature resistant flame-retardant epoxy glue has the advantages of high high-temperature toughness, high adhesion strength, high flame retardant performance and the like.

An echogenic catheter, such as a needle catheter, formed at least in part of an intrinsically conductive organic polymer for providing a highly conductive surface in combination with an improved ability to ultrasonically image the catheter, and a method of performing a medical procedure using a catheter of the invention.

The invention belongs to the technical field of composite materials, and relates to a polylactic acid composite material and a preparation method thereof. The polylactic acid composite material is prepared from the following components in percentage by weight: 5 to 90 percent of polylactic acid, 5 to 80 percent of biodegradable polyester and 5 to 80 percent of heat-resistant master batch. The heat-resistant high-toughness polylactic acid composite material is obtained by continuous in-situ reaction extrusion. The composite material simultaneously has the characteristics of high toughness, high temperature resistance, low production cost, full biodegadability and the like.

The invention provides a gear lubricant composite for manual transmissions of the light cars, comprising (A) at least one type of refining mineral oil with high viscosity index, or polyolefin synthesis oil, or ester lubricants, or a free composite of the above components, (B) at least one type of viscosity index improver, (C) at least one type of pour point depressant, (D) at least one type of extreme pressure additive with sulfurs, (E) at least one type of anti-wear additive with phosphorus, (F) at least one type of wear, oxygen, and corrosion-preventing multifunctional additive with phosphorus, (G) at least one type of anti-rusting additive, and (H) at least one type of friction modifier. The lubricant composite has excellent performance of high and low temperature, which can meet the requirements of gear oil with a viscosity grade of 75W/90. Moreover, passing the full-size gear bench tests as CRCL-42, L-37, L-33, L-60, and L-60-1 as well as cycle bench tests for the manual transmissions of the light cars, the gear lubricant composite can meet lubrication requirements of the manual transmissions of the light top-grade cars.

The invention discloses a matte brick stain-proofing agent. The matte brick stain-proofing agent is prepared from a component A, a component B and a component C, wherein the component A is an organic solvent, the component B is silicon resin, and the component C is at least one of silicone oil and organosiloxane monomers. The invention further provides a preparation method of the matte brick stain-proofing agent. By compounding the components, the matte brick stain-proofing agent can achieve a good stain-proofing effect when used for performing stain-proofing treatment on the surfaces of matte bricks in follow-up application; besides, the matte brick stain-proofing agent has a very long shelf life and service life; moreover, the preparation technology is simple and easy to implement and can be conveniently applied to industrial production.

The invention provides a nano aluminum nitride heat radiation paint for an LED lamp, wherein the paint is prepared by the raw materials by weight (Kg): 30-34 parts of organic silicone resin, 12-14 parts of E-12 epoxy resin, 6-8 parts of methylenebiscyclohexanamine, 12-15 parts of nano aluminum nitride powder, 1-2 parts of hydroquinone, 4-5 parts of silane coupling agent KH550, 1-2 parts of cross-linking agent TAC, 2-3 parts of alumina, 2-3 parts of silicon carbide, 1-2 parts of sodium metasilicate, 1-2 parts of triethanolamine, 4-6 parts of PEVE fluorocarbon resin, 3-4 parts of glass bead, 1-2 parts of ammonium polyphosphate, 8-10 parts of xylene, 10-12 parts of ethyl acetate, and 4-5 parts of film forming auxiliary agent. Nano aluminum nitride powder is added so as to greatly raise heat conduction rate of the paint, and to make the paint have good heat radiation effect; silicon carbide is added so as to raise the wear resistance of the paint; the paint has advantages of large paint adhesion stress, not-easy shedding, and good fireproof performance; and the organic silicone resin is used as a base material, so as that the paint has good insulating property and excellent thermo-oxidative stability.

The invention discloses a phthalonitrile modified benzoxazine and epoxy resin composite material, preparation and an application. According to the invention, phthalonitrile modified benzoxazine and epoxy resin are composited, and the hthalonitrile modified benzoxazine and epoxy resin composite material is a novel high-performance thermoset polymer composite material; phenolic hydroxyl groups produced through benzoxazine curing not only can be taken as a phthalonitrile curing catalyst, but also can be taken as an epoxy resin curing agent, through synthetic curing of phthalonitrile, benzoxazine and epoxy resin, the crosslinking density of the material is further increased, and properties such as thermal oxidation stability, radiation resistance, high temperature resistance, flame retardancy, corrosion resistance, low water absorption property and the like are further improved, so that the material has excellent comprehensive performance to attract broad attention and is taken as high-performance resin material for wide application in the high-technology fields such as electronic industry, aerospace and the like. According to the monomer preparation method, the synthesis period is greatly shortened, raw materials for monomer synthesis are cheap and easily available, the preparation method is simple and convenient, and the yield is high. The related processing technology of the composite material is simple, and the performance is good.

The invention discloses an anti-aging method for polymer materials, which is to add plant polyphenol into the polymer materials as a free radicals capturing agent, wherein the plant polyphenol mass content in the polymers is 0.1 to 10 percent. In the invention, the plant polyphenol is added into the polymer materials as the free radicals capturing agent, so the thermal stability, thermal oxygen stability, light stability, light oxygen stability and other aging performances of the polymer materials are improved, and the service lives of the polymer materials are prolonged. The plant polyphenol has the advantages of naturalness, wide source, high efficiency, no toxicity and the like, and can be used by mixing with the polymers in the conventional processing equipment without special process treatment. The invention opens a new field for the application of the plant polyphenol and provides a new anti-aging method for the polymer materials.

The invention pertains to certain (per)fluoropolyether triazine derivatives comprising at least one triazine group and at least one fluoropolyoxyalkene chain (chain R_f) comprising a fluorocarbon segment having ether linkages in main chain, said chain R_f comprising at least one hydroxyl group, to a method for their manufacture and to their use in lubrication, in particular for lubricating sliding or moving parts of magnetic recording media.

The invention relates to a preparation method of phosphorus boronizing ashless dispersant, which comprises the following steps: ashless dispersant, phosphorus-containing additive, boracic acid, ethoxylation aliphatic amine, water and fatty alcohol are mixed and react at 70 to 100 degree centigrade, and then a product is separated and collected. The phosphorus-containing additive is phosphoric acid, phosphorous acid, phosphoric acid ester or phosphite ester. The preparation method of the phosphorus boronizing ashless dispersant provided by the invention improves the boronizing quality, and no boron slag is produced in the preparation process.

The invention relates to a phase change energy storage microcapsule taking polyurethane modified organic silicon resin as a shell material and a preparation method of the phase change energy storage microcapsule, and particularly discloses the preparation method which comprises the following steps: (1) uniformly mixing monomers for generating organic silicon resin, adding a catalyst, and prepolymerizing to obtain a prepolymer of polysiloxane; (2) adding the polyurethane prepolymer into the step (1), and carrying out a reaction to obtain a polyurethane modified organic silicon resin prepolymer;(3) uniformly mixing a core material with the shell material prepolymer to obtain a core material and shell material prepolymer mixture; (4) preparing an aqueous solution of a surfactant; and (5) mixing and emulsifying the core material and shell material prepolymer mixture and the aqueous solution of the surfactant to obtain an emulsion, adding a catalyst until the reaction is finished, separating, and drying to obtain the polyurethane modified organic silicon resin shell phase change energy storage microcapsule. The method is green, pollution-free and simple to operate, and the obtained microcapsule is smooth in surface, good in compactness, adjustable in phase change temperature, controllable in particle size, good in heat resistance and high in phase change enthalpy value.

Triglyceride and other polyol ester PVC plasticizers can be produced by recovery of branched C6 to C9 aldehydes from a hydroformylation product, optional hydrogenation to the alcohol, oxidation to the acid with oxygen and/or air, recovery of the resulting acid, and esterification with glycerol, ethylene glycol, propylene glycol or mixtures thereof. The branched alkyl chains comprise at least 10% methyl branching. Special triglycerides are derived from branched aliphatic acids having alkyl chains with average carbon numbers from 6 to 9 and at least 10% methyl branching. These triglycerides are fast fusing plasticisers if before esterification with glycerol, an aryl acid is introduced together with the aliphatic acids.

This invention relates to polyimides having improved thermal-oxidative stability, to the process of preparing said polyimides, and the use of polyimide prepolymers in the preparation of prepregs and composites. The polyimides are particularly useful in the preparation of fiber-reinforced, high-temperature composites for use in various engine parts including inlets, fan ducts, exit flaps and other parts of high speed aircraft. The polyimides are derived from the polymerization of effective amounts of at least one tetracarboxylic dianhydride, at least one polyamine and a novel dicarboxylic endcap having the formula:

The invention belongs to the field of benzoxazine resin in polymer synthetic materials and discloses side-chain phthalonitrile modified benzoxazine resin, a preparation method and an application. The resin has a general structural formula shown in a formula I, wherein n is an integer larger than or equal to 1. By means of the characteristic of strong molecular structure design of a benzoxazine monomer, a polymerizable phthalonitrile group is introduced into an aromatic diamine compound through a conventional chemical reaction, then the aromatic diamine compound carrying the phthalonitrile group, paraformaldehyde and bisphenol A have condensation polymerization, and the side-chain phthalonitrile modified benzoxazine resin is prepared. Phthalonitrile which is a polymerizable group is introduced into benzoxazine, so that phthalonitrile can participate in curing, the crosslinking density of polybenzoxazine resin can be further increased, and the thermal stability of polybenzoxazine can be further improved. The preparation method is simple and convenient, a synthesis period is short, the yield is high, and raw materials are easy to obtain.

The invention discloses a lubricant composition used in an electric mechanical transmission device. The lubricant composition is prepared from a complex of trimellitate and poly-alpha-olefin serving as base oil as well as a plurality of composite additives comprising a rust inhibitor, an antioxidant, an oiliness agent, an anti-wear agent, a metal deactivator, a friction modifier, an anti-foaming agent, an oxidation-resistant and corrosion-resistant agent, a detergent and a dispersing agent. The lubricant composition disclosed by the invention has excellent detergency and dispersibility, cooling property, lubricating property, sealing property, friction property, rust-inhibiting property, corrosion resistance and extreme pressure anti-wear property; by the lubricant composition, a layer of uniform and continuous oil film having a certain thickness is easily formed in a movement friction pair, the coefficient of friction in the movement is decreased, the carrying capacity is increased and the phenomenon of adhesion of transmission members and vibration and noise are reduced.

The invention belongs to the technical field of preparation of promoters for high polymer materials and particularly relates to a preparing method for a multifunctional and efficient beta nucleating agent for isotatic polypropylene materials. It is indicated that polydopamine can be used in the polypropylene beta nucleating agent. The multifunctional and efficient beta crystal nucleating agent is high in nucleating efficiency, good in compatibility with polypropylene matrixes, simple in preparing method and capable of improving the thermal oxidation stability of polypropylene materials.

The invention discloses an environmental-friendly hydraulic oil composition and a production method thereof. The environmental-friendly hydraulic oil composition comprises the following raw material components per kilogram: 982 to 986.6 grams of base oil, 11 to 12 grams of antioxidant, 1.0 to 3.0 grams of extrcme pressure antiwear additive, 0.4 to 0.5 gram of metal deactivator and 1.2 to 2.0 gg of antirusting agent. The production method of the environmental-friendly hydraulic oil composition comprises the following steps of: after mixing component oils in the base oil according to a certain ratio, heating to a temperature of 75 to 85 DEG C and stirring for 4 hours; then adding other various additives together; and stirring for 4 hours at a temperature of 50 to 60 DEG C to obtain the the environmental-friendly hydraulic oil composition disclosed by the invention. The environmental-friendly hydraulic oil composition disclosed by the invention has low cost and has performances of excellent abrasion resistance, oxidation resistance, hydrolytic stability, anti-rusting property, biodegradability and the like.

The invention provides a lubricating method for wind power generator, which comprises a lubricant, a wind power generator. Compound lubricant is adopted; the main lubricating parts of the wind power generator include a gear box, a generator bearing, a crab system bearing and gear, a hydraulic brake system and a min bearing. Compared with the ordinary mineral grease, the adopted compound lubricant has the advantages of excellent viscosity-temperature characteristics and little impact due to temperature change, is able to ensure easy startup under low temperature and no loss under high temperature, thereby providing sufficient lubrication for the friction parts. In addition, with excellent stability of thermal oxidation and little loss in vaporization, the lubricant can be used for a long time under rigid working condition and climatic situation. Especially, with high biodegradation rate, the compound lubricant can be widely promoted as it results in no pollution to the soil and water source.

The invention relates to an optical diffusion agent for an acrylic optical diffusion board and a preparation method of the optical diffusion board. The acrylic optical diffusion board comprises the following components in percentage by mass: 97.0-99.5 percent of polymethyl methacrylate and 0.5-3.0 percent of the optical diffusion agent which is a random copolymer of styrene and methylacryloyl propyl phenyl polyhedral oligomeric silsesquioxanes (MAPhPOSS). After the MAPhPOSS is copolymerized with styrene, even if the using amount of styrene monomers is small, the contribution of a nanoscale inorganic core can reach the same shading coefficient and light scattering property, and organic MMA groups in the POSS can avoid phase separation due to excessive addition amount, so that the optical diffusion board is uniform in surface, phase separation stripes are avoided, and a good diffusion body is obtained. The acrylic optical diffusion board can be applied to the field of outdoor photoelectric display of outdoor lamps, advertising light boxes, billboards, light source covers and the like with light-emitting diodes (LEDs) as light sources.

The invention discloses a preparation process of a graphene nanocomposite material. The preparation process comprises the following steps: 1, weighing raw materials; 2, preparing an epoxy resin prepolymer from bisphenol A type diglycidyl ether and diethyltoluenediamine; 3, preparing a mixed solution of an epoxy resin prepolymer and ethanol; 4, adding modified graphene oxide; and 5, conducting curing. According to the invention, epoxy resin is used as a matrix, and modified graphene oxide is added in a pre-compounding stage, so in the process of modifying the graphene oxide, a large number of nanometer SiO2 particles are deposited on a lamellar structure, a -NCO group is introduced into the surface of the material, and the mechanical property and the heat-resistant stability of the nanocomposite material can be remarkably improved; and since the nanometer SiO2 particles are deposited on the lamellar structure of the graphene, so the nanocomposite material can be converted into SiO2 nanosheets with high thermal oxidation stability and high radius-thickness ratio during combustion, and the nanocomposite material has excellent flame retardant property.