37results about How to "Moderate modulus of elasticity" patented technology

The invention discloses a cement-emulsified asphalt self-permeable grouting material applied to semi-flexible pavement, which comprises 100 parts of cement, 50-150 parts of mineral admixture, 15-40 parts of expansion agent, 0-80 parts of river sand, 0.5-20 parts of water agent, 60-140 parts of water, and 50-150 parts of emulsified asphalt, all of which are parts by weight. The grouting material of the present invention is low in cost, good in fluidity, long in working time, and satisfies the grouting characteristics of self-permeation of slurry; has good interfacial bonding performance with asphalt, and has a certain early strength function; the volume change rate is small, and the degree of delamination is less than 0.3%, with good volume stability; both cationic emulsified asphalt and anionic emulsified asphalt can be used, with a wide range of applications; applying this grouting material to semi-flexible pavement can greatly improve the fatigue life of flexible pavement The shear performance is effectively improved.

The invention discloses an automotive copper-based powder metallurgy composite friction material and a manufacturing method thereof. The manufacturing method includes that firstly, a basis powder material is mixed with a molding agent uniformly to obtain a mixture, the mixture is poured into a mold and is shaped into slender rods by pressing, the slender rods are compacted and separated and then charged into a sintering furnace, and the sintering furnace is heated up under protection of nitrogen gas or hydrogen gas so that a copper-based powder metallurgy friction material is obtained; secondly, the copper-based powder metallurgy friction material is subjected to processes of shearing, grinding and screening; thirdly, by mass percent, 10-20% of cashew nut oil modified phenolic resin, 30-60% of the copper-based powder metallurgy friction material, 10-20% of reinforced fibers, 5-15% of abrasives, 10-20% of lubricants and 5-20% of fillers are mixed uniformly to obtain a powder mixture, and the powder mixture is then subjected to hot press molding, is cooled to the room temperature and then is discharged from the furnace. The automotive copper-based powder metallurgy composite frictional material has both advantages of high temperature resistance and low abrasion as the copper-based powder metallurgy friction material and high ductility and low hardness as the resin-based composite friction material.

The invention provides a preparation method of a composite frictional material. The preparation method comprises the following steps that 1, a ferrous-based powder metallurgical frictional material is prepared; 2, shearing, smashing and screening are performed; 3, material mixing is performed; 4, the composite frictional material is prepared; 5 posttreatment is performed; 6, the composite frictional material is machined. Compared with the prior art, the composite frictional material integrates the characteristics of high temperature resistance and low abrasion resistance of the ferrous-based powder metallurgical frictional material and the characteristics of good toughness and low hardness of a resin-based composite material and has the advantages of high temperature resistance, low abrasion resistance, good toughness and low hardness. The ferrous-based powder metallurgical frictional material is used for preparing an automobile braking accessory, scratching of an automobile brake disc or drum is effectively avoided based on good braking performance, and frictional noise is small.

The invention discloses a preparation method of a resin based powder metallurgy composite friction material for vehicles, wherein the preparation method comprises the following steps: 1) preparing a powder metallurgy friction material: mixing evenly a base material and a forming agent, pouring the mixture into a mold, pressing to slender rods, separating the slender rod-shaped pressed blanks, and sintering, to obtain a powder metallurgy friction material; 2) shearing, crushing and screening; 3) mixing: according to the mass percentage, evenly co-mixing 10-20% of high-temperature-resistant modified resin, 40-60% of the powder metallurgy friction material, 10-20% of a reinforcing fiber, 5-15% of an abrasive, 10-20% of a lubricating material and 5-20% of a filler; 4) producing and preparing a resin based composite friction material; 5) post-treating; and 6) carrying out mechanical processing. The resin based powder metallurgy composite friction material retains the stable friction coefficient and good anti-abrasion properties of the powder metallurgy friction material. The service life and the high-temperature stability of the friction material are improved.

The invention relates to an interface adhesive material, a white-to-black overlay structure based on the material and a construction process of the overlay structure. The interface adhesive material comprises the following components in parts by mass: 20 to 60 parts of dry powder, 100 parts of modified emulsified asphalt, 20 to 40 parts of silicone rubber emulsion and 10 to 30 parts of a polyurethane modified epoxy resin material. The interface adhesive material has excellent adhesiveness, waterproofness and ultimate deformation capability, is moderate in elastic modulus, and can firmly bond an asphalt concrete layer with a cement concrete layer to form an integrally stressed composite pavement structure; when the asphalt concrete layer is horizontally pushed, accompanying deformation of an interface adhesive layer consumes partial energy, so that stripping caused by excess relative slip of the asphalt concrete layer is avoided; meanwhile, the elastic modulus of the interface adhesive layer is moderate and between the elastic modulus of the asphalt concrete layer and the elastic modulus of the cement concrete layer, so that the transitional effect can be achieved between the asphalt concrete layer and the cement concrete layer, the stress generated by traffic loads can be uniformly transferred, and the stress concentration phenomenon is effectively solved.

The invention relates to the field of manufacturing of heavy trunk brake pads, in particular to a heavy truck brake pad with a man-made skeleton as a framework and a manufacturing method of the heavy truck brake pad. The porous man-made skeleton framework is made of carbon fiber toughened ceramic, a porous framework material is filled with resin, friction performance modifier, filler and the like to make a high-performance special brake pad friction material, and thus the heavy truck brake pad can adapt to a special working environment and has the advantages of being low in density, high in strength, good in heat resistance, high in friction coefficient, stable and long in service life. The heavy truck brake pad can adapt to extreme working conditions with high temperature and high loads, is suitable for high-speed heavy trucks, lifting devices for mines and the like and has huge promotional application values.

The invention discloses an explosion-proof membrane production method. The method comprises the following steps: providing a release film, putting a first uncoiler on the release film, passing the release film through a coating roller and a baking oven of a coating machine in order, then passing the release film through a composite wheel; providing an optical adhesive, adding a hardener in the optical adhesive, uniformly stirring the materials; separating the set temperature of the baking oven of the coating machine from an inlet to an outlet to a first temperature zone, a second temperature zone and a third temperature zone; providing a hardening membrane, putting a second uncoiler on the hardening membrane, passing one end of the hardening membrane through a corona machine and the composite wheel by the second uncoiler, applying a first surface of the hardening membrane and the first surface of the release film at the position of the composite wheel; turning on an explosion-proof membrane production device, coating the optical adhesive to the first surface of the release film by the coating machine, performing corona on the first surface of the hardening membrane by the corona machine, and compositing the first surface and the first surface of the release film on the composite wheel to form the explosion-proof membrane. According to the explosion-proof membrane production method, the produced explosion-proof membrane has the advantages of low cost, high quality and long service life.

The invention relates to the technical field of reinforcing materials of concrete structures and especially relates to a composite carbon fiber plane grid rib which is composed of following components, by mass: 20-50 parts of an epoxy resin mixture, 10-30 parts of N,N,N',N'-tetraglycidyl-m-xylylenediamine tetramethacrylate, 20-30 parts of carbon fibers, 1-4 parts of a curing agent, 1-3 parts of a promoter, 8-15 parts of a flame retarding agent, 5-9 parts of a plasticizer and 4-8 parts of a filling material. The composite carbon fiber plane grid rib has an excellent mechanical performance, is good in anti-fatigue performance, is more than 94% in strength retention ratio after ten million times of fatigue tests, can greatly improve a tensile strength, a bending strength, a flexibility and an anti-cracking performance of a concrete member, can reduce a weight of the member, is anti-corrosion, has a electromagnetic shielding performance and is suitable in the fields such as bridge plates, pavement plates, building structures and the like.

The invention belongs to the technical field of biological materials, and specifically relates to a mussel bionic binder-calcium phosphate high-strength bone repair material, a high-strength compositeCaP scaffold and a preparation method thereof. In view of the problems of insufficient strength, especially toughness, and insufficient printability and formability of bone repair materials in the prior art, the invention discloses the mussel bionic binder-calcium phosphate high-strength bone repair material and the preparation method thereof. The technical scheme is as follows: the mussel bionicbinder-calcium phosphate high-strength bone repair material is prepared from the following materials in parts by weight: 5-35 parts of a bionic binder, 65-95 parts of calcium phosphate salt and 95-105 parts of deionized water, wherein the bionic binder is prepared by dissolving 1-3 parts by weight of 3.4-dihydroxyphenylmethacrylamide in 10 parts by weight of a mixed solvent, and the calcium phosphate salt is prepared by mixing alpha-tricalcium phosphate, hydroxyapatite, calcium hydrogen phosphate dihydrate and calcium carbonate. The mussel bionic binder-calcium phosphate high-strength bone repair material is applicable to the repair of bone injury.

The invention discloses a hydrophilic membrane. The hydrophilic membrane comprises a hydrophilic fiber membrane and a hydrophilic coating coated on the hydrophilic fiber membrane, wherein the hydrophilic fiber membrane is prepared from 40 to 60 parts of corn starch resin, 20 to 30 parts of poly (butylene succinate), 10 to 20 parts of poly (ethylene glycol succinate) and 1 to 4 parts of cyanoguanidine; the hydrophilic coating is formed by coating a hydrophilic coating prepared from 100 parts of an acrylic copolymer, 30-50 parts of deionized water and 20-30 parts of PVA on the hydrophilic fiber membrane. Compared with the prior art, the hydrophilic film disclosed by the invention has the advantages of moderate elastic modulus, good skin fitness, good water absorption rate, higher water retention rate and degradability.

The invention relates to a preparation method of a nano-hydroxyapatite/polymer compound bone replacement material, wherein, the content of n-HA of the n-HA/polymer compound bone replacement material which is prepared by in situ blending of the nano-hydroxyapatite (n-HA) non-hydrolytic sol and polymer is 20 to 60wt percent. The preparation method includes: the polar and hydrophilic polymer is dissolved in organic solvent; the mixture is stirred and blended with the n-HA sol to lead the n-HA granules are evenly distributed in the polymer to form chemical bond with the polymer; and then the n-HA/polymer compound material is obtained by centrifugal separation, drying, hot-press molding and so on. The hydroxyapatite with nano-scale in the compound bone replacement material prepared by the invention is evenly distributed in the polymer substrate and forms strong chemical bond with the polymer. The invention not only has high tensile and bending strength, appropriate elastic modulus and other mechanical performances, but can also ensure that the material has good biocompatibility, thus meeting the clinical using requirement of human bearing bone repair material.