39results about How to "Retain heat resistance" patented technology

The invention belongs to the field of material preparation, and specifically discloses a method for preparing a multi-grain scale magnesium alloy sheet by a non-uniform section rolling method. The method for preparing the multi-grain scale magnesium alloy sheet by the non-uniform section rolling method comprises the following steps that (1), a non-uniform section sheet is formed, specifically, protrusions are formed in the surface of the formed non-uniform section sheet; (2) an annealing treatment is conducted; and (3) multiple passes of sheet rolling is conducted, specifically, a multi-grainscale sheet with uniform section is obtained through multiple passes of rolling. According to the method for preparing the multi-grain scale magnesium alloy sheet by the non-uniform section rolling method, a magnesium alloy sheet is rolled by different rolls, and a special heat treatment technology cooperates to prepare a multi-grain scale magnesium alloy sheet; and the heat resistance effect of arare earth magnesium alloy material retains while high strength and plasticity are achieved.

The invention relates to a cold-construction non-curable rubber modified asphalt coating for waterproofing and a preparation method thereof, and belongs to the technical field of chemical engineering.The coating composition is prepared from the following raw materials in parts by mass: 20-40 parts of asphalt, 10-15 parts of thermoplastic rubber, 15-30 parts of a solvent, 8-12 parts of softening oil, 1-2.5 parts of a viscosity regulator, 8-10 parts of phosphated nano silicon oxide, 3-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 15-30 parts of calcium carbonate powder and 1-3 parts of mineral fibers. According to the invention, the softening oil, the phosphated nano silicon oxide and the 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate are added into the waterproof coating tomodify the waterproof coating, so that viscosity of the coating is reduced, the flowing property of the coating is improved, the coating can be sprayed under a relatively low-temperature condition of60 DEG C or below, and high energy consumption and high pollution caused by high-temperature spraying are avoided. The coating can be widely applied to waterproofing, dampproofing and seepage proofingof important projects such as high-speed rails, subways, high ways, airports, underground pipe galleries, bridges, tunnels and the like.

The invention relates to the technical field of adhesives, and provides an oil-resistant organic silicon sealant and a preparation method thereof. The oil-resistant organic silicon sealant is preparedfrom the following components in parts by weight: 100-150 parts of alpha, omega-dihydroxypolysiloxane (107 silicone rubber), 10-20 parts of a ketoxime cross-linking agent, 1-3 parts of an amino silane coupling agent, 50-200 parts of a filler, 0.1-0.3 part of a tin catalyst, 10-50 parts of an oil-resistant additive and 2-10 parts of white carbon black. The problems that an existing oil-resistant organic silicon sealant is high in manufacturing cost, poor in high-temperature resistance and the like are solved.

The invention discloses a synthetic method for epoxy end group polythioether liquid rubber. The method comprises the following steps: synthesizing sulphydryl end group polythioether liquid rubber by using thiodiglycol, hydroxyethyl-2-hydroxypropyl thioether and the like as main monomers; then using polyethylene glycol diglycidyl ether resin as a transforming agent so as to transform a sulphydryl end group into an epoxy end group so as to finally generate the end group polythioether liquid rubber. The technology has the advantages that the polyethylene glycol diglycidyl ether resin is adopted as the transforming agent of the end group, the defects that the viscosity of a sulphydryl in traditional epoxy modification technology is high, solvents of toluene, butanone and the like are needed to perform dilution, the reaction exotherm is violent, and a side effect is easy to generate are overcome; reactions are smooth, the product quality is easy to control, the viscosity of the generated epoxy end group polythioether liquid rubber is moderate, and the stability is good; the strength of epoxy resin and the toughness and the heat resistance of polythioether rubber are reserved after the end group is transformed, so that the brittleness of the epoxy resin is improved, and the adhesive property of materials is improved.

The invention relates to a polylactic acid / polyester alloy and a preparation method thereof. The polylactic acid / polyester alloy comprises the following components in percentage by weight: polylactic acid, polyester, a compatilizer, a flexibilizer, an antioxidant and a lubricant. The preparation method comprises the following steps: firstly, proportioning the raw materials and mixing at a room temperature; and respectively carrying out melting extrusion, carrying out ultrasonic treatment at the first late stage, extruding at the second stage and pelletizing, so as to obtain degradable, high-impact-resistant and high-heat-resistant polylactic acid / polyester alloy. Compared with an existing method, the controllable ultrasonic treatment is utilized; and a similar polylactic acid-g-polyester structure is formed by in-situ reaction, so that the heat resistance of the polyester and the biodegradability of the polylactic acid are reserved; and meanwhile, a toughening system with a core-shell structure is formed in an alloy system through interface interaction of a special toughening compatilizer, so that the alloy product with high impact resistance, high heat resistance and high biodegradability can be obtained.

The invention belongs to the field of material preparation, and specifically discloses a method for preparing a multi-grain scale magnesium alloy sheet by a non-uniform section rolling method. The method for preparing the multi-grain scale magnesium alloy sheet by the non-uniform section rolling method comprises the following steps that (1), a non-uniform section sheet is formed, specifically, protrusions are formed in the surface of the formed non-uniform section sheet; (2) an annealing treatment is conducted; and (3) multiple passes of sheet rolling is conducted, specifically, a multi-grainscale sheet with uniform section is obtained through multiple passes of rolling. According to the method for preparing the multi-grain scale magnesium alloy sheet by the non-uniform section rolling method, a magnesium alloy sheet is rolled by different rolls, and a special heat treatment technology cooperates to prepare a multi-grain scale magnesium alloy sheet; and the heat resistance effect of arare earth magnesium alloy material retains while high strength and plasticity are achieved.

A modified cyanate ester resin which is a low-viscosity liquid at ordinary temp and its preparing process are disclosed. It has higher comprehensive property and lower viscosity, so it can be shaped by RTM technology and ordinary temp.

The invention discloses a double crosslinking point monomer carboxylic acid type acrylate rubber and a preparation method thereof. The carboxylic acid type acrylate rubber is obtained by polymerizing the following monomers calculated by mass percentage: 65%-85% of alkyl acrylate monomers; 10%-30% of oil-resistant and low-temperature resistant monomers; 3%-30% of vulcanization point monomers 8%; wherein, the vulcanization point monomers include butenedioic acid diester monomers and ethylenically unsaturated monomers containing carboxyl groups, and the butenedioic acid diester monomers and carboxyl group-containing The mass ratio of the ethylenically unsaturated monomers in the group is 1:2 to 2:3; the ester group in the butenedioic acid diester monomer is an ether alcohol with 6 to 10 carbon atoms. The rubber prepared by the present invention further improves the processing performance and improves the smoothness of the rubber surface on the basis of retaining the low compression set rate, oil resistance and heat resistance of the carboxylic acid type acrylate rubber, and the obtained acrylate vulcanizate composition can be used for Preparation of hydraulic oil pipes, cylinder gaskets, gaskets and other components for automobiles and locomotives.

The invention belongs to the field of protein engineering and genetic engineering, and specifically relates to a heat-resistant xylanase XYNB with high enzyme activity at low temperature and its mutant gene, application and gene sequence preparation method. The invention provides a xylanase with high enzyme activity at low temperature Xylanase XYNB has significantly higher enzyme activity than the original enzyme at temperatures below 80°C, while retaining the heat resistance of the original enzyme. It is suitable for industrial fields such as feed additives, food, brewing, and medicine.

The invention relates to an abrasive belt, which is a zirconium corundum heavy-duty strong abrasive belt, composed of a cloth base, an adhesive, and a grinding material. The grinding material is zirconium corundum, and the grinding material is bonded to the cloth base through the adhesive. It is characterized in that: The adhesive is composed of the following components by weight percentage: 28% to 36% of first-order thermosetting phenolic resin, 4% to 8% of diphenolic propane type epoxy resin, 1% to 4% of melamine resin, and 0.2% to 0.6% of boron %, dispersant 0.1%~0.3%, coupling agent 0.1%~0.3%, diluent 3%~6%, fluoride salt 45%~60%, inert gas fluoride 0.5%~1%. The adhesive of the present invention improves the heat resistance of the abrasive belt and the bonding strength under high temperature conditions. The zirconium corundum heavy-duty strong abrasive belt of the present invention can quickly soften and reduce the hardness of the metal surface, which will neither burn the metal surface nor greatly improve the hardness of the abrasive belt. improved grinding efficiency.

The invention provides an organic-inorganic composite water-based aluminum powder paint and a preparation method thereof. The raw materials and contents of the water-based aluminum powder paint are: 30-45 parts of styrene-acrylic emulsion or pure acrylic emulsion, 0.3-0.8 parts of defoaming agent, film-forming 0.5-2.0 parts of agent, 15-20 parts of water, 5-15 parts of filler, 5-8 parts of water-based aluminum powder, 0.3-1 part of thickener, 15-25 parts of inorganic silicate; the preparation method is: Add defoamer and film-forming aids to the emulsion to disperse evenly; add fillers and aluminum powder to water to form a slurry, add the wetted slurry to the emulsion with additives, add a thickener after the dispersion is uniform, and detect When it reaches the specified viscosity, add silicate under stirring to disperse evenly, measure and pack after passing the test. The product of the invention has high hardness, temperature resistance, solvent resistance, durability, good adhesion, flexibility and other mechanical properties, and also realizes odorless, low VOC, safety and environmental protection.

The invention relates to a high-heat-resistant garment allowing releasing of body surface static electricity. The high-heat-resistant garment comprises a garment body (1). A lining of the garment body (1) is provided with metal wires (2); sleeves of the garment body (1) are provided with metal sheets (3); the metal wires (2) are connected with the metal sheets (3); the garment body (1) is made of shell fabric comprising a polysulfonamide fabric layer, bonding layers of polymer material and coatings allowing the shell fabric to be waterproof and breathable; the bonding layers and the coatings are alternately distributed thrice. The high-heat-resistant garment allows the body surface static electricity to be released, is capable of balancing the body surface static electricity and is good in heat resistance.