41results about How to "Little change in mechanical properties" patented technology

The invention relates to an environmental-friendly polyvinyl chloride (PVC) extraction-resistant anti-seepage film and a preparation method thereof, belonging to the technical field of salt film preparation. The environmental-friendly PVC extraction-resistant anti-seepage film contains the following ingredients in proportioning ratio: 100 parts by mass of PVC resin, 10-50PHR of primary plasticizer, 2-10PHR of secondary plasticizer, 2-5PHR of environmental-friendly heat stabilizer, 0.1-0.5PHR of antioxidant, 6-30PHR of filler and 0.1-0.3PHR of lubricant. The preparation method of the environmental-friendly PVC extraction-resistant anti-seepage film comprises the steps of (1) preparing a kneaded material: metering all the ingredients, mixing and cooling; (2) plasticizing: plasticizing by using a planetary extruder; (3) calendering: filtering the material in a filter, and feeding the material to a calender; (4) spreading: after the material passes through the calender, spreading to widen, and then, cooling for forming, thereby preparing the environmental-friendly PVC extraction-resistant anti-seepage film. According to the environmental-friendly PVC extraction-resistant anti-seepage film and the preparation method thereof, the preparation process is simple, and the controllability is good; the product has the advantages of good water and brine extraction resisting performance, high mechanical properties, little loss, high retention rate, and the like.

The invention relates to a preparation method of a high-temperature structure-function combining B4C/Al neutron absorbing material. The preparation method comprises the concrete steps of (1) adopting a high energy ball milling method for ball-milling aluminum powder into flake aluminum powder; (2) placing the flake aluminum powder into an air furnace for pre-oxidizing, and forming a layer of nanometer aluminum oxide film on the surface of the aluminum powder; (3) uniformly mixing the pre-oxidized flake aluminum powder and micron-sized B4C particles; (4) pressing molding the uniformly mixed powder; (5) conducting pressureless sintering or hot pressed sintering on a pressing-molded pressing blank; and (6) forging, extruding or rolling a sintered billet so as to obtain the high-temperature structure-function combining B4C/Al neutron absorbing sectional material or sheet material. By adopting the method, a certain amount of nanometer aluminum oxide can be introduced into a pure aluminum matrix, and the micron-sized B4C particles are added, so that the aluminum-based neutron absorbing material with two-phase reinforcement of micron B4C and nano Al2O3 can be prepared, has both a neutron absorbing performance and an excellent high-temperature mechanical property, and can be applied in the fields of spent fuel dry storage, transportation and the like.

The invention discloses an ethylene propylene rubber material for a sealing part of an automobile heat dissipation system and a production method of the ethylene propylene rubber material and belongs to the technical field of rubber. The rubber material is prepared from the following components in parts by weight: 100 parts of raw ethylene propylene rubber, 5 parts of zinc oxide, 0.5 to 1.5 parts of stearic acid, 3 to 6 parts of an anti-ageing agent, 20 to 30 parts of fast extruding carbon black N550, 10 to 20 parts of semi-reinforced carbon black N774, 3.5 to 7 parts of a cross-linking auxiliary agent Ricon 153D and 5 to 8.5 parts of a vulcanizing agent Perkadox 14-40B-GR. The rubber material disclosed by the invention has excellent high-temperature-resisting performance and can be used for a long time under the condition that the temperature is -50 DEG C to 150 DEG C; meanwhile, the rubber material has remarkable advantages of low temperature resistance and low-compression permanent deformation.

The invention relates to a mine structural tube material, which is characterized in that: said tube is formed by high-density polythene added with anti-static agent and flameproof agent, while the mass percentages comprise: high-density polythene at 80-87%; the flameproof agent at 8-10%, wherein the flameproof agent is micro capsule red phosphorus; the anti-static agent is conductive carbon black. The invention can be used to supply water, discharge water, compress wind, plate pulp, and exhaust gas. The invention has the advantages that: the tube is added with flameproof agent to obtain high flameproof property; the tube is added with anti-static agent to reduce the surface resistance. The invention has light weight and anti-pressure property.

The invention relates to a technological method for heat treatment to a titanium alloy welded component. The technological method comprises the following step (1) of removing oil stain from the surface of the titanium alloy welded component to be treated; the step (2) of adding a little water to high temperature anti-oxidation coatings for dilution, and mixing the water and the coatings uniformlyto obtain high temperature anti-oxidation coating aqueous solutions, and coating the aqueous solutions on the surface of the titanium alloy welded component to be treated; the step (3) of clamping andfixing the titanium alloy welded component to be treated with a tool after drying the high temperature anti-oxidation coating aqueous solutions; the step (4) placing the titanium alloy welded component clamped and fixed with the tool properly into a resistance furnace, and setting heat treatment process parameters, wherein the annealing temperature Tm is 500-600 DEG C, the temperature rise time tis 1.5-2.0 h, and the holding time tm is 2.0-2.5 h; cooling the titanium alloy welded component in the furnace to 200 DEG C and below, taking out the titanium alloy welded component from the furnace,and air-cooling the titanium alloy welded component to room temperature; and the step (5) of cleaning the coatings on the surface of the titanium alloy welded component. Compared with the prior art,the technological method has the advantages of convenient operation, and high economy and adaptability.

The invention discloses a weather-resistant flame-retardant polypropylene composite material which is characterized by comprising 93-97wt% of polypropylene, 1-2wt% of main flame retardant, 0.2-0.5wt% of synergistic flame retardant, 0.1-0.5wt% of chain-cutting agent, 0.1-0.5wt% of foaming agent and 1.5-2wt% of carbon black, and further comprising 0.1-1wt% of other assistants, wherein the other assistants include one or more of antioxidant, dispersant and lubricant; and the carbon black is channel carbon black, and the particle size is 15-25nm. The invention also discloses a preparation method of the weather-resistant flame-retardant polypropylene composite material. According to the invention, the carbon black is selected as weather resistance modifier; the bromine-containing flame retardant, the synergistic flame retardant, the high-temperature chain-cutting agent and the high-temperature foaming agent are combined; the weather-resistant flame-retardant polypropylene composite material is prepared through melt blending; the weather resistance is excellent; the flame retardance is up to UL94V-0 level; the mechanical performance of the material changes little before and after modification; and the weather-resistant flame-retardant polypropylene composite material is low in raw materials and simple and easy to process.

The invention discloses a high-temperature strengthening method for a structural-functional integrated neutron absorbing material. According to the high-temperature strengthening method, powder metallurgy and pressure forming are adopted, and the high-temperature strengthening method comprises the following steps that (1), 5 to 20wt.% of B4C, 1 to 8wt.% of a nanometer oxide material, and aluminumalloy powder are uniformly mixed by high-energy ball milling; (2), uniformly mixed powder is subjected to isostatic cold pressing and then compression-molded into a billet, the compression-molded billet is placed in an aluminum wrapping sleeve to be subjected to high-temperature vacuum degassing treatment, the billet is sealed and welded in the aluminum wrapping sleeve after a required vacuum degree is reached, and then the billet andaluminum wrapping sleeve subjected to high-temperature vacuum degassing treatment are subjected to hot-pressing molding, hot forging molding, hot extrusion molding, or hot rolling molding; or the uniformly mixed powder in the step (1) is directly subjected to hot extrusion molding; (3), the material molded in the step (2) is compression-molded through isostatic cold pressing; and (4), the compression-molded material in the step (3) is rolled at a certain temperature to obtain a desired neutron absorbing material.

The invention relates to the field of polymer composite materials, specifically to a halogen-free flame-retardant reinforced PA/POK alloy material with hygrothermal aging resistance. The halogen-freeflame-retardant reinforced PA/POK alloy material is composed of the following components by weight: 130 to 620 parts of PA66, 50 to 200 parts of POK, 200 to 350 parts of glass fiber, 10 to 50 parts ofa compatible impact modifier, 100 to 200 parts of a halogen-free flame retardant, 10 to 50 parts of a flame-retardant synergist and 10 to 20 parts of an auxiliary agent. The alloy material provided by the invention adopts aluminum diethyl hypophosphite and polysiloxane to compound for retarding flame, can reach the flame retardancy of V-0, and has good mechanical properties; the alloy material provided by the invention can still reach the flame retardancy of V-0 after hygrothermal aging, and has small change in mechanical properties; and the alloy material provided by the invention has abrasion coefficient superior to the abrasion coefficient of pure flame-retardant PA66 + GF.

The present invention relates to a flexible composite lining pipe material, which comprises a pipe material inner layer, wherein the material of the pipe material inner layer is a high density polyethylene material, and the high density polyethylene material comprises, by weight, 100 parts of a high density polyethylene resin, 1-10 parts of inorganic nanoparticles, one or a plurality of materials selected from 2-10 parts of talc powder, 1-9 parts of montmorillonite and 1-10 parts of sepiolite, one or a plurality of materials selected from 1-20 parts of nylon 6, 1-20 parts of nylon 66, 1-20 parts of polyethylene glycol terephthalate and 1-20 parts of glass fiber, and 1-20 parts of high density polyethylene grafted maleic anhydride adopted as a compatibilizer, and/or 1-20 parts of ethylene-octene copolymer grafted maleic anhydride as a compatibilizer. According to the present invention, the flexible composite lining pipe material is provided, which can be used as the water delivery material and the oil delivery material in industrial applications, and can ensure the no change of the material, the increased temperature resistance, the little mechanical property change and the increased thermal performance increasing under the conditions of high temperature and high pressure.

The invention discloses a method for synthesizing a water-expandable body material. The method comprises the following steps: 1. adding ethylene oxide, propylene oxide, pentaerythritol and potassium hydroxide into a vacuum pump, and carrying out a reaction, so as to obtain a macromolecular polyether; 2. subjecting the macromolecular polyether to a reaction with toluene diisocyanate, so as to obtain a special prepolymer; and 3. stirring the special prepolymer with liquid rubber, bentonite, an anti-aging agent, white carbon black, a chain extender and a hydrophilic chain extender, injecting themixture into a casting machine, and carrying out demolding, thereby obtaining the water-expandable body material. According to the water-expandable body material, the water absorbency of the water-expandable body material is improved, and the water-expandable body material has the advantages of high water absorption rate and high water absorption expansion rate. The water absorbency of the water-expandable body material is improved, and meanwhile, the water-expandable body material has the characteristics that the mechanical properties are good, the change of the mechanical properties is smallbefore and after water absorption, and the stability is high; and the water-expandable body material is oil-resistant, wear-resistant and aging-resistant and is an ideal material applied to the fields of waterproofing and anti-seepage.

The invention relates to a preparation method for a modified polyvinyl chloride material. The preparation method comprises the following steps: mixing titanium dioxide with carbon black; raising temperature to 60-80 DEG C; then, adding titanate coupling reagent, stirring for 10-20min, and drying and grinding to obtain weather-proof accessory ingredient of which the particle size is 100nm or below,wherein the mass ratio of titanium dioxide, carbon black to the titanate coupling reagent is (4-7): (2-5):1; after polyvinyl chloride, auxiliary materials and the weather-proof accessory ingredient are evenly mixed, carrying out extrusion molding to obtain the modified polyvinyl chloride material. According to the preparation method, through preprocessing, titanium dioxide, carbon black and the titanate coupling reagent are more favorably dispersed and combined with polyvinyl chloride, in addition, the synergetic anti-ultraviolet function of titanium dioxide and carbon black can be improved,meanwhile, the titanate coupling reagent is more favorable for combining titanium dioxide, carbon black and polyvinyl chloride than other coupling reagents, so that the resistance ability of the polyvinyl chloride material for ultraviolet can be improved, the polyvinyl chloride material is unlikely to be decomposed, aged and discolored, mechanical performance change is small, excellent weather fastness is obtained, and the preparation method is especially suitable for preparing various classes of PVC (polyvinyl chloride) pipe materials.

The invention relates to the technical field of medical devices, in particular to an alimentary canal stent and a manufacturing process thereof. The alimentary canal comprises a main body, a first support portion and a second support portion; The main body, the first support portion and the second support portion are formed of degradable polymer material by 3D printing, the first support portion and the second support portion are provided at both ends of the main body, and the first support portion and the second support portion are used for matching and abutting with the digestive tract portto support the digestive tract. So as to alleviate the technical problem that the stent needs to be removed by a second operation after being used, thereby increasing the burden of the patient in theprior art.

The invention relates to the technical field of polyurethane screens and in particular relates to a substrate for preparing a polyurethane screen with high temperature resistance and moisture and heatresistance. The substrate comprises four main preparation steps of preparation of a dispersion liquid, preparation of a latex mixed liquid, preparation of a composite filler and preparation of a polyurethane substrate. According to the substrate, the composite filler is prepared by using a latex coprecipitation method, moisture in the polyurethane substrate can be effectively absorbed through thehydrophilcity of latex in the filler and is prevented from diffusion, and meanwhile, through the reinforcing function of black carbon white and glass beads, the black carbon white and the glass beadsare modified and mixed with the latex to form the composite filler which is dispersed into polyurethane, so that large internal heat generated inside the polyurethane under a dynamic condition can beeffectively reduced, and properties of high temperature resistance and moisture and heat resistance of the polyurethane can be improved.

The invention provides a method for preparing a polyester fiber reinforced epoxy composite material based on ultraviolet radiation modification and relates to a resin-matrix composite material. The method comprises the following steps of: grafting active groups including acylamino and carboxyl to the surface of the polyester fiber by virtue of ultraviolet radiation modification; compositing epoxy resin with a polyester fiber fabric by virtue of a vacuum flow guide technique; and curing the resin, thereby obtaining the polyester fiber reinforced epoxy composite material. The method provided by the invention is simple, convenient, free from pollution and practicable.

The invention provides a graphene composite PVC material and a preparation method thereof, and belongs to the technical field of PVC materials. Comprising the following raw materials in parts by weight: 7-12 parts of porous graphene hollow microspheres, 70-100 parts of PVC resin, 1-2 parts of a compatilizer, 0.5-1 part of an antioxidant, 0.2-0.5 part of monoglyceride, 5-10 parts of a plasticizer and 1-3 parts of a heat stabilizer. According to the invention, the compatibility of the inorganic porous graphene hollow microspheres in PVC resin is improved, so that the mechanical properties of the PVC plastic are not greatly changed, the antistatic property of the PVC plastic is greatly improved due to good conductivity of graphene, and the preparation method is simple, wide in raw material source and wide in application prospect.

The invention discloses a preparation method of a perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafted modified polypropylene film, and the method comprises the following steps: weighing a first predetermined mass fraction of perylene-3, 4, 9, 10-tetracarboxylic dianhydride, and dissolving the perylene-3, 4, 9, 10-tetracarboxylic dianhydride in a non-polar organic solvent under a continuous first stirring condition to obtain a long-term stable PPDI solution at room temperature; weighing a second predetermined mass fraction of 2-methylallylamine, and dissolving the 2-methylallylamine in the PPDI solution under a continuous second stirring condition to react to obtain a PPDI alkenylation solution; weighing the alkenylated PPDI powder, an initiator and polypropylene in a third predetermined mass fraction, and dissolving in a non-polar organic solvent; adding a predetermined amount of acetone solution into the perylene-3, 4, 9, 10-tetracarboxylic dianhydride grafted polypropylene solution under the condition of ice-water bath to separate out solid product crystals; and carrying out hot pressing on the powdery solid PP-g-PPDI to obtain a film-shaped sample so as to obtain the N-type molecular semiconductor grafted modified polypropylene film.