30results about How to "Equivalent tensile strength" patented technology

The invention discloses a high-performance recycled PET/ABS alloy. The alloy comprises the following components in percentage by weight: 30 to 80 percent of recycled PET, 10 to 50 percent of ABS, 1 to 10 percent of reinforcing agent, 2 to 15 percent of compatilizer, 0.5 to 5 percent of flexibilizer, 0.5 to 3 percent of polyhydroxy chemical coupling agent, and 0.1 to 1 percent of antioxidant. The alloy can improve a recycled PET system by using reasonable matching of additives, effects of the polyhydroxy chemical coupling agent, and excellent physical mechanic properties of an ABS system. Therefore, the recycled PET /ABS alloy has the advantages of high compatibility, high tensile strength, high mobility, good machinability and the like, is particularly suitable for producing complicated components and parts and large plates, has a simple process, is suitable for mass production of medium-sized and small enterprises, and has obvious economic benefit and social benefit.

The SnAgCuNi tinsel features n the weight composition of 1. 5-2. 5% Ag, 0. 1-0. 8% Cu, 0. 01-0. 5% Ni, 0. 001-0. 1% P, 0-0. 01% Bi with the rest being Sn and unavoidable impurities. The SnAgCuBi lead free solder alloy does not have any lead, being more environmental protective, with low fuse point, better moisture feature, with anti stretch, flexibility, expansion and creep resistance equal to the tinsel alloy.

The invention provides a rubber compound additive particle, and belongs to the technical field of rubber. The rubber compound additive particle comprises, by weight, 20-30 parts of rubber, 5-8 parts of zinc oxide, 3-5 parts of stearic acid, 4-6 parts of anti-aging agents, 0.5-1 part of scorch retarders, 3-5 parts of accelerators and 2-4 parts of vulcanizing agents. The particle is cylindrical, thediameter of the particle is 2-5mm, and the height of the particle is 5-10mm. The rubber compound additive particle has functions of activating agents, the anti-aging agents, the accelerators, the vulcanizing agents and the scorch retarders, a small number of additives are used, the same effects can be achieved as compared with a traditional production process, the multifunctional rubber compoundadditive particle is a colloidal particle, on one hand, dispersion effects of various rubber additives in rubber can be effectively improved, on the other hand, matching is facilitated, weighing errors are reduced, environmental pollution caused by dust in production is decreased, and physical health of operators is facilitated.

The invention discloses one-component room temperature vulcanization silicone rubber with a simple process and a preparation method thereof, and relates to the field of room temperature vulcanized silicone rubber. The one-component room temperature vulcanized silicone rubber is prepared from, by mass, 100 parts of hydroxyl terminated polyorganosiloxane alkane, 25-35 parts of silicone oil, 70-100 parts of a heavy filler, 5-15 parts of fumed silica, 0.1-0.3 part of a water remover, 6-14 parts of a cross-linking agent, 1.7-4 parts of a silane coupling agent and 0.01-0.09 part of dibutyl tin dilaurate. The preparation method of the one-component room temperature vulcanized silicone rubber adopts a formula design and raw material selection, uses powder with a low water content rate to interactwith the low-active cross-linking agent, and achieves high-temperature dehydration, the whole production process time is greatly shortened, the process is very simple, large-scale production is easilyachieved, and the storage stability is equal to a high temperature dehydration process.

The invention discloses unsaturated polyester and a fiber reinforced composite material thereof based on an environment-friendly reactive solvent. A styrene-free unsaturated polyester resin matrix is synthesized by taking propylene glycol, isophthalic acid and fumaric acid as raw materials under certain conditions, and then the composite material is prepared by carrying out hot-press molding on the styrene-free unsaturated polyester resin matrix based on N-vinylpyrrolidone as a reactive solvent and raw bamboo fiber as a reinforcement body. Since the unsaturated polyester used in the composite material prepared by the method is free of the reactive solvent having carcinogenicity styrene, the unsaturated polyester has the characteristics of environment friendliness and low cost, and the prepared composite material has the advantages of very high tensile strength, flexural strength, flexural modulus and impact strength.

The invention discloses a pectin preservative film and a preparation method thereof. The pectin preservative film comprises the following components in parts by mass: 8-15 parts of pectin, 3-6 parts of polyvinyl alcohol, 0.5-0.8 part of adhesive, 0.8-1.3 parts of glycerol, 0.05-0.1 part of sodium hydroxide and 70-80 parts of water. The adhesive is gelatin or agar. The preparation method comprises the following steps: dissolving the pectin in water, adding the sodium hydroxide to regulate the pH value to 7-8, heating to 80-90 DEG C, stirring until the pectin is completely dissolved, adding the polyvinyl alcohol, adhesive and glycerol, stirring to obtain a viscous sol, pouring the sol into a double screw extruder, carrying out extrusion plastifying, and carrying out film blowing. The widely existent pectin used as the main film-forming material is degradable and can not cause environmental pollution; and the prepared preservative film has the advantages of uniform thickness, equivalent tensile strength and elongation at break to the commercially available common PE (polyethylene) film, and higher light transmittance, and can be used as a substitute of the common PE film.

The invention relates to a welding method of pipelines. The welding method specifically comprises the following steps that preheating is performed as follows: when the temperature of the environment where the pipelines are located is lower than 0 DEG C, to-be-welded openings of the pipelines and surrounding pipes are preheated to the specified temperature; welding is performed as follows: sealed welding is performed on the to-be-welded openings in the circumferential directions of the pipes; and heat preservation is performed as follows: heat preservation treatment is performed on welding lines formed in the to-be-welded openings and the surrounding pipes, so that the temperature of the welding lines and the surrounding pipes is decreased at the rate not higher than the preset rate until the temperature of the welding lines and the surrounding pipes is decreased below the preset rate. According to the welding method, the temperature of the to-be-welded openings and the surrounding pipes is controlled by the aid of early waste heat and later heat preservation, and the residual stress of the to-be-welded openings and the surrounding pipes is reduced, so that the tensile strength of the welding lines is equivalent to that of the pipes, the problem that cracks appear easily after low-temperature welding is solved, the safe service performance of the heat supply pipelines is improved, and the work and the life of town residents are guaranteed.

The invention discloses degradable and thermoplastically processable epoxy vitrimers and a preparation method thereof, and belongs to the technical field of new material synthesis. The preparation method comprises the following steps: mixing an epoxy monomer with a beta-diketone structure with an amine curing agent in proportion, stirring the mixture, pouring the mixture into a mold, and heating the mixture until the curing is complete. The epoxy vitrimers obtained by the invention can be degraded in an acidic solution at the temperature of below 80 DEG C for 24 hours after being cured, and have a thermoplastic processing function; after being damaged, the epoxy resin can be self-repaired through hot pressing (10MPa, 10min) at 130-180 DEG C. The preparation process is simple, and the epoxyresin is expected to be used in the fields of recovery of reinforced fibers in epoxy composite materials, degradable or self-repairing epoxy coatings, degradable epoxy adhesives and the like.

The invention relates to a preparation method of a hyperbranched epoxy polymer nano silicon dioxide composite chrome-free tanning agent, which comprises the following steps: reacting diethanol amine with methyl acrylate to obtain N,N-dihydroxyethyl-3-amidomethyl propionate; with trimethylolpropane as a reaction center core and N,N-dihydroxyethyl-3-amidomethyl propionate as a monomer (AB2 monomer),preparing hydroxyl-terminated hyperbranched poly (amine ester) by adopting a nucleated one-step method under the catalysis of p-toluenesulfonic acid pTSA; then, an epoxy chloropropane modification method is adopted for modification, and an epoxy-terminated hyperbranched polymer is synthesized; and finally, compounding the chrome-free tanning agent with nano silicon dioxide to obtain the compositechrome-free tanning agent. The hyperbranched epoxy polymer nano silicon dioxide composite chromium-free leather ecological tanning agent prepared by the invention has good water solubility, no toxicity and no pollution, the tanned leather is white and soft in color, fine in grain surface and good in extensibility, and the hyperbranched epoxy polymer nano silicon dioxide composite chromium-free leather ecological tanning agent has a wide application prospect as an environment-friendly leather chromium-free tanning agent.

The invention discloses a dam air bag conveying belt, and belongs to the technical field of conveying belts. The dam air bag conveying belt comprises a first rubber covering layer, a framework layer and a second rubber covering layer, the framework layer is clamped between the first rubber covering layer and the second rubber covering layer, and the framework layer, the first rubber covering layer and the second rubber covering layer are combined into a whole through a vulcanization technology, wherein the framework layer is made of canvas. The dam air bag conveying belt has the beneficial effects that the framework layer made of the canvas is arranged between the first rubber covering layer and the second rubber covering layer, the canvas is formed by interweaving warps and wefts, the density of the warps and the wefts is 8-12 pieces per centimeter, and therefore the elasticity, softness and elongation of the dam air bag conveying belt are improved; and meanwhile, the equivalent tensile strength of the dam air bag conveying belt in the warp direction and the weft direction in the inflation process is ensured.

The invention discloses a PC/PA composite material with relatively high light transmittance and a preparation method thereof. The composite material takes PC, PA10I and a copolymer thereof as main raw materials, a proper amount of an antioxidant and a lubricant are added, and compared with the existing PC/PA, the prepared product has the advantages that the tensile strength, bending strength, processing fluidity, heat resistance and other properties are basically equivalent; however, the product prepared by the method is good in transparency, and can be used for preparing products with transparent requirements.

The invention provides a lifting tool for a sheared-off continuous oil tube and a using method. The lifting tool comprises a mandrel, wherein a rolling slot sleeves outside the mandrel; a sealing rubber sleeve sleeves the mandrel below the rolling slot; a pressing part sleeves the mandrel above the rolling slot; the bottom end of the mandrel is connected to a stud head; a limiting lug boss is further connected in the middle of the rolling slot; and the rolling slot is divided into an upper rolling slot and a lower rolling slot through the limiting lug boss. Through the lifting tool, a continuous oil tube and a pre-arranged continuous oil tube are connected together, so that complex high-risk continuous oil tube crane lifting operation is converted into conventional continuous oil tube operation during lifting, and therefore, construction efficiency is greatly improved, and the safety risk is remarkably reduced. The lifting tool adopts an up-down symmetrical type three-rolling-slot design, adopts a gradual deepening type design for slot depth, has tensile load equivalent to tensile strength of the continuous oil tube, is simple in design and is high in tensile strength.

The invention discloses an isocyanate-cross-linked soybean oil-based resin/natural fiber composite material and a preparation method thereof. The method comprises the following steps: adopting a di-functional group isocyanate monomer as a cross-linking agent of epoxy soybean oil acrylate, and preparing soybean oil-based thermosetting resin of which the degree of cross linking, the viscosity and the heat resistance are greatly improved; carrying out hot press molding for natural fiber, the isocyanate-cross-linked soybean oil-based resin and an initiator, and thus obtaining the natural fiber-reinforced soybean oil-based resin composite material. The prepared natural fiber-reinforced soybean oil-based thermosetting resin composite material has good tensile strength, tensile modulus, bending strength, bending modulus and impact strength.