37results about How to "Improve mechanical properties such as strength" patented technology

The invention discloses a B1-grade special high-flame-retardant low-smoke halogen-free cable material and a preparation method thereof, and relates to the technical field of wires and cables. The technical key point is that the B1-grade special high-flame-retardant low-smoke halogen-free cable material comprises the following components in parts by weight: 25 to 50 parts of linear low-density polyethylene; 50 to 100 parts of an ethylene-vinyl acetate copolymer; 100 to 150 parts of aluminum hydroxide; 10 to 25 parts of modified nano silicon dioxide; 5 to 10 parts of montmorillonite; 1 to 5 parts of an antioxidant; 5 to 10 parts of a compatilizer; 5 to 10 parts of a lubricant; the preparation method of the modified nano silicon dioxide comprises the following steps: adding nano silicon dioxide into absolute ethyl alcohol, uniformly stirring and dispersing, then adding a silane coupling agent, heating to react for 3-4 hours, and drying and grinding the nano silicon dioxide after the reaction is finished so as to obtain the modified nano silicon dioxide. The obtained low-smoke halogen-free cable material has the advantages that the B1-grade flame-retardant standard is met, the mechanical property is high, and the processability is excellent.

The invention belongs to the technical field of building materials, and particularly relates to a solid waste-based inorganic artificial stone plate and a preparation method thereof. The solid waste-based inorganic artificial stone plate comprises, by weight, 46-66 parts of a solid waste-based material, 90-165 parts of quartz sand, 4-12 parts of an excitant, 7-16 parts of water, 0-2 parts of a water reducing agent and 0-10 parts of an inorganic pigment. The water consumption is low, generation of pores in the product due to excessive moisture is avoided, and the strength and other mechanical properties of the plate are improved; reinforcing materials such as fibers, resin and polyvinyl alcohol do not need to be additionally added, the chemical activity of solid waste is fully utilized, allthe raw materials are matched and used in proportion, that is, the solid waste-based inorganic artificial stone plate with high polymerization degree, high compactness and high strength can be generated in situ through the coordination effect of all the components, the mechanical property requirement of the artificial stone plate is met, the economic cost is effectively reduced, no free formaldehyde is released, and the solid waste-based inorganic artificial stone plate is more environmentally friendly, better in fireproof and high-temperature-resistant performance and wide in application prospect.

The invention discloses a preparation method of a medical porous metal implanting material. The preparation method comprises the steps of: mixing tantalum powder, pore-forming agent and forming agent to mixed powder; and carrying out granulation, mould-injection forming, demoulding, degreasing, sintering and heat treatment to obtain the medical porous metal implanting material which is used for replacing tooth bone tissues, wherein the pore-forming agent comprises one or more of sodium bicarbonate, urea, sodium chloride, methylcellulose and ethyl cellulose; the forming agent comprises one or more of polyvinyl alcohol, stearic acid, zinc stearate, paraffin and synthetic rubber; and the degreasing process comprises the steps of: gradually raising the temperature to 400-800 DEG C at a speed of 0.5-3 DEG C/min, introducing in argon to form protection atmosphere and holding the temperature for 60-240min. According to the preparation method provided by the invention, the sintering and heat treatment steps are effectively improved, so that the mechanical property of a prepared porous tantalum material is greatly improved and the porous tantalum material is particularly suitable for serving as a medical implanting material for replacing the tooth bone tissues of human body.

The invention discloses a method for preparing a medical porous metal implant material. The method comprises the following steps of: mixing tantalum powder, a pore forming agent and a forming agent to obtain mixed power, wherein the pore forming agent is one or more of sodium bicarbonate, urea, sodium chloride, methylcellulose and ethylcellulose, and the forming agent is one or more of polyvinyl alcohol, stearic acid, zinc stearate, paraffin wax and synthetic rubber; pelletizing; injecting into a mould and forming; demoulding; degreasing, namely gradually raising temperature to 400 to 800 DEG C at the speed of 0.5 to 3 DEG C/min, introducing argon to form protective atmosphere and preserving heat for 60 to 240 minutes; sintering; and performing thermal treatment, namely raising temperature to 800 to 900 DGE C at the speed of 10 to 20 DEG C/min under the vacuum degree of 10<-4> to 10<-3> Pa, preserving heat for 240 to 480 minutes, cooling to 400 DEG C at the speed of 2 to 5 DEG C/min, preserving heat for 120 to 300 minutes, and cooling to room temperature along with a furnace, and finally, the medical porous metal implant material for replacing dentale tissues can be obtained. Through tests, the prepared porous tantalum material is very suitable to be used as the medical implant material for replacing dentale tissues.

The invention discloses a graphene natural rubber oil-resistant mixed foaming material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 36-44 parts of natural rubber, 28-33 parts of nitrile butadiene rubber, 8.5-11.5 parts of cis-1,4-polybutadiene rubber, 14-16 parts of polyvinyl chloride resin, 4-6 parts of white carbon black, 1.2-1.5parts of silicone oil, 1.7 to 2.1 parts of zinc oxide, 1.4 to 1.8 parts of zinc stearate, 1.3 to 1.6 parts of stearic acid, 2.3 to 2.9 parts of a cross-linking agent, 2.5 to 3.5 parts of graphene, 1.9 to 2.5 parts of a foaming agent and 1.8 to 2.4 parts of a flow aid. After being soaked in a hydrocarbon oil solvent (such as butyl acrylate), the product still maintains high tensile strength and high elongation at break, is not easy to react with the hydrocarbon oil solvent, and has good oil resistance and good mechanical properties; the compression set rate, the rebound resilience and the mechanical property are good; and wear resistance is good.

The invention provides a casting method for a sink roll shaft sleeve. The casting method includes the steps of drying and preheating, raw material smelting, casting parameter setting, casting, and discharging from a furnace. Variable-pressure centrifugal casting is adopted. According to the casting method, the sink roll shaft sleeve is manufactured from creative raw material ingredients through the method combining non-equal-pressure casting and centrifugal casting, so that the microstructure of the sink roll shaft sleeve is made more compact, the dynamic properties, such as strength, of the sink roll shaft sleeve are effectively improved, the sink roll shaft sleeve is durable, and long-time stable operation of a sink roll is guaranteed.

The invention relates to a high-performance thermoplastic elastomer for a cable of a charging pile and a preparation method of the high-performance thermoplastic elastomer, and belongs to the technical field of polymer materials. The thermoplastic elastomer is prepared from components in parts by weight as follows: 30-40 parts of a styrene elastomer, 30-39 parts of polyformaldehyde, 18-26 parts ofmodified porous CaCO3, 8-15 parts of cellulose fiber, 29-42 parts of a flame retardant, 3-8 parts of an oil resistant agent and 6-10 parts of a softening agent. The prepared thermoplastic elastomer has the characteristics of being high in strength, resistant to tear, heat and wear and good in flame retardance.

The invention discloses a graphene rubber macromolecular flame-retardant composite foaming material and a preparation method thereof. The graphene rubber macromolecular flame-retardant composite foaming material comprises the following raw materials in parts by weight: 50-60 parts of natural rubber, 13-17 parts of butadiene rubber, 4-6 parts of ethylene propylene diene monomer, 4-6 parts of whitecarbon black, 14-17 parts of a flame retardant, 1.8-2.4 parts of graphene, 4-6 parts of a nano medium, 2-3 parts of zinc oxide, 2.5-4 parts of a heat stabilizer, 2-2.4 parts of a cross-linking agent,3-4 parts of a flow aid and 2-2.4 parts of a foaming agent, wherein the flame retardant is a mixture of zinc diethylphosphinate and triphenyl phosphate. The flame-retardant test of the graphene rubbermacromolecular flame-retardant composite foaming material reaches a UL-94V0 level, and the oxygen index of the graphene rubber macromolecular flame-retardant composite foaming material is far higherthan that of a common natural rubber foam material; the density of the graphene rubber macromolecular flame-retardant composite foaming material is lower than that of a common natural rubber foaming material, and the graphene rubber macromolecular flame-retardant composite foaming material is ultra-light; and moreover, the tensile strength of the graphene rubber macromolecular flame-retardant composite foaming material is greatly superior to that of a common natural rubber foaming material, the mechanical property is good, and the ultra-light property and the excellent mechanical property arewell considered.

The invention discloses a graphene natural rubber polymer surfboard composite foamed material and a preparation method thereof. The graphene natural rubber polymer surfboard composite foamed materialis prepared from the following raw materials in parts by weight: 47-53 parts of natural rubber, 32-36 parts of butyl rubber, 8.5-11.5 parts of isoprene rubber, 5-7 parts of a nano medium, 2-2.5 partsof graphene, 3.5-4.5 parts of fumed silica, 1.5-2 parts of zinc oxide, 3-4 parts of a heat stabilizer, 2-2.5 parts of a cross-linking agent, 3-4 parts of a flow aid and 2-2.2 parts of a foaming agent.The density of the graphene natural rubber polymer surfboard composite foamed material is far lower than that of a common natural rubber foamed material, and the graphene natural rubber polymer surfboard composite foamed material has ultralight weight; the water absorption rate is far lower than that of the common natural rubber foamed material, the tensile strength is far higher than that of thecommon natural rubber foamed material, the mechanical property is good, and the graphene natural rubber polymer surfboard composite foamed material is very suitable to be taken as a surfboard material and has a wide market application prospect.

The invention provides a method for preparing novel bamboo fiber composite materials. The method includes shearing bamboo fibers, washing the bamboo fibers by ethyl alcohol and distilled water, then placing the bamboo fibers in drying ovens at the temperatures of 90-105 DEG C and drying the bamboo fibers until the bamboo fibers are absolutely dry; mixing polyethylene glycol, polyether and polyimide with one another, stirring the polyethylene glycol, the polyether and the polyimide at the temperature of 60-80 DEG C for 20-40 min to obtain mixed liquid and uniformly stirring the mixed liquid; adding dibutyl sebacate into the mixed liquid, and stirring the dibutyl sebacate and the mixed liquid at the temperature of 100-120 DEG C for 10-30 min; adding the dried bamboo fibers and potassium persulfate into the mixed liquid; carrying out ultrasonic treatment at the power of 1000-1500 W for 8-15 min; increasing the temperatures until the temperatures reach 130-150 DEG C and carrying out hot-pressing under the pressure of 2-5 MPa for 20-40 min; carrying out natural cooling until the temperatures reach the room temperature so as to obtain the novel bamboo fiber composite materials.

The invention discloses a high-strength tear-resistant nonwoven fabric for bag production and a preparation method thereof. The high-strength composite fibers are made from the following raw materials in parts by weight: 30-37 parts of polybutylene adipamide, 45-55 parts of polyhexamethylene adipamide, and 15-55 parts of polysebamide 20 parts, 10-14 parts of poly(p-phenylene terephthalamide), 3.5-5 parts of carboxylated carbon nanotubes, 2.5-3.5 parts of graphene oxide, 1.5-2.2 parts of cerium oxide, 3-5 parts of nano-fillers, 5 to 10 parts of flow aid. Under the condition of the same thickness, the high-strength tear-resistant non-woven fabric for bag production of the present invention has large bursting strength and breaking strength, which are obviously better than ordinary nylon non-woven fabrics, and has high strength and high tear resistance. Excellent performance.

The invention provides a lithium polymer battery and a preparation method thereof. The preparation method of the lithium polymer battery comprises the following steps: putting the diaphragm into a molten hot melt adhesive for infiltration operation to obtain the reinforced diaphragm, so that the problems of internal corrosion and expansion of the lithium polymer battery are effectively prevented, and the safety performance of the lithium polymer battery is improved; respectively attaching the positive plate and the negative plate to the two surfaces of the reinforced diaphragm to obtain a roll chip; carrying out tab welding operation on the roll chip to obtain a to-be-wound roll chip; winding the to-be-wound roll core sheet to obtain a roll core body; carrying out hot pressing operation on the roll core body to obtain an integrated battery core; and loading the integrated battery cell into an aluminum plastic sleeve, injecting an electrolyte, and then carrying out packaging operation to obtain the lithium polymer battery, so that the structural stability and safety of the lithium polymer battery cell are further improved.