48results about How to "Improve surface toughness" patented technology

The invention relates to transparent matt polyurethane varnish. The preparation method of the varnish comprises the following steps: according to weight percentage, 40 to 60 percent of alkyd, 10 to 40 percent of elastic resin and 0.3 to 1.0 percent of a dispersant are sequentially added and are dispersed at the speed of 500 revolutions per minute for 3 to 5 minutes to evenness; while stirring, 2.0 to 5.0 percent of flatting powder, 3.0 to 10 percent of glass powder and 0.5 to 2.0 percent of wax powder are added and are dispersed for 15 minutes at the speed of 1,000 revolutions per minute till the fineness is less than or equal to 25 mu m; 0.2 to 0.5 percent of a leveling agent, 0.2 to 0.5 percent of an antisettling agent and 13.6 percent of a mixed solvent are sequentially added and are dispersed for 10 minutes at the speed of 800 revolutions per minute; 1.0 to 5.0 percent against 20 percent scratch resistant resin which is pre-dispersed is added into a varnish material obtained by the steps under the low-speed stirring; and after adding, the varnish material is dispersed for 10 to 15 minutes at the speed of 500 revolutions per minute to evenness and is filtered to obtain the transparent matt anti-scratch polyurethane varnish. The crosslinking density NCO/OH of the varnish and a curing agent is between 1.0 and 1.1; and the curing agent is mixed by the following compositions in weight percentage: 25 percent of aliphatic poly-isocyanate, 45 percent of aromatic poly-isocyanate and 30 percent of anhydrous butyl acetate. The varnish has good scratch resistance and high hardness; and a varnish film has smooth hand feeling, good transparence, does not blanch basically, has good storage stability and can be recoated.

There is provided a cemented carbide comprising a hard phase component which comprises a tungsten carbide (WC) and at least one selected from carbides, nitrides and carbonitrides of metals of the groups 4a, 5a and 6a in the periodic table; and a binder phase component comprising at least one of iron-group metals, wherein the surface region of the cemented carbide has 90-98% of the minimum hardness as compared with internal hardness, thereby having high hardness and toughness which is suitable to using as a cutting tool.

The invention provides a silicon micro-powder with surface chemical modification, and a preparation method and an application of same, and belongs to the field of surface modification for non-metal-based materials. The preparation method includes the following steps: treating the surface of surface-hydroxylated silicon micro-powder with a silane coupling agent; and performing chemical grafting to the surface with epoxy group-terminated organosilane to form filler which has high surface toughness and has high compatibility and dispersibility in epoxy glue. Compared with silicon micro-powder without surface chemical modification, the preparation method enables the filler to have high dispersibility in epoxy glue, can effectively improve the toughness of the epoxy glue, and is very suitable for the fields of anti-low-temperature epoxy pouring sealants, sealing adhesives and bonding adhesives.

A wheel support bearing assembly includes an outer member (1), which serves as a stationary member and has an inner periphery formed with a plurality of rows of raceway surfaces (3), an inner member (2), which serves as a rotatable member and has an outer periphery formed with respective raceway surfaces (4) opposed to the previously described raceway surfaces (3), and a plurality of rows of rolling elements (5) interposed between the respective opposed raceway surfaces (3, 4). The outer member (1) is thermally refined by means of a quenching and a high temperature tempering process so that a layer of at least 2 mm in depth from a surface of the outer member is rendered to have a micro-pearlite structure.

The invention provides a preparation method of modified rubber particles and an application thereof, anti-freezing pervious concrete and an application thereof as well as an anti-freezing pervious brick and a preparation method thereof, which belong to the technical field of pervious building materials. The preparation method comprises the following steps: mixing rubber particles with a surface treating agent, and carrying out surface coating treatment to obtain rubber particles with surfaces coated with the surface treating agent; wherein the surface treating agent comprises the following components in parts by weight: 15-35 parts of water glass, 2-6 parts of silicon phosphate, 50-75 parts of silica powder, 0.1-1 part of urea and 0.1-2 parts of hydroxypropyl methyl cellulose; and carryingout a curing reaction on the rubber particles coated with the surface treating agent at 40-60 DEG C for 1-3 hours to obtain the modified rubber particles. When the obtained modified rubber particlesare used for preparing the frost-resistant water-permeable concrete, the modified rubber particles are high in binding force with other components of the concrete, and the prepared frost-resistant water permeable brick is good in water permeability, high in strength and excellent in frost resistance.

The invention belongs to the technical field of polyvinyl chloride plates, and particularly relates to a PVC foamed fold-proof plate and a preparation method thereof. The PVC foamed fold-proof plate comprises a core layer and surface layers, wherein the core layer is made from a foamed PVC material, and is prepared from PVC resin powder I, filler I, foaming regulator, compound foaming agent, calcium-zinc stabilizer, soybean oil, a lubricating agent and pigment; the upper surface layer and the lower surface layer are made of same raw materials; the surface layer is prepared from PVC resin powder I, PVC resin powder II, filler II, a processing aid, a fold-proof toughening specific agent, a weather-resistant modifying agent, calium-zinc stabilizer, a lubricating agent and pigment; and the fold-proof toughening specific agent is high-molecular-weight chlorinated polyethylene acrylate grafted polymer. The PVC foamed fold-proof plate has the advantages of high strength, pulling and folding resistance, surface cracking prevention, large-angle fold use availability and no mark, few combined joint and joint surface of the composition, environmental friendliness, sanitation, convenience in cleaning, high cost performance and wide application range.

On respective surfaces of the work pressing site and the body part of the portion having a less diameter of a preliminary formed article comprising SKH51 (a Fe base alloy), a powder of a material containing an element enhancing the hardness of SKH51 and a powder of a material containing an element being contained in SKH51 and not enhancing the hardness of SKH51 are applied respectively. By the heat treatment of the preliminary formed article after the above application, W and the like having been contained in an application agent is diffused into the surface side in the work pressing site, whereas, in the body part of the portion having a less diameter, W and the like having been contained in SKH51 is diffused into the surface side. As a result, a diffusion layer, wherein hardness increases as the distance from the surface decreases, is formed inside the work pressing site, and simultaneously, a concentration change portion, wherein toughness improves as the distance from the surface decreases, is formed in the body part of the portion having a less diameter.

The invention discloses a high-strength-and-ductility gray pig iron surface tissue form heating power reconstruction method, and relates to metal material surface modification. The method mainly comprises the steps of gray pig iron surface magnetic control forced cooling laser fusion, laser shock and follow-up graphitization annealing treatment. Firstly, laser radiation is carried out to enable the gray pig iron surface to generate quick fusion under the action of a magnetic field, forced cooling solidification is carried out, and the wee surface white tissue is formed; secondly, laser shock is adopted for treating the gray pig iron surface obtained after laser fusion, the stress state of a fusion layer is changed, the white tissue on the surface layer is further refined, the tissue defectis increased, and tissue preparation is made of graphitization annealing; and finally, graphitization annealing is carried out to enable cementite in the surface refined whit tissue to be converted into wee spheroidal graphite, and the high-strength-and-ductility surface tissue form is prepared. By means of the method, the gray pig iron surface tissue form can be effectively improved, the graphitization time is shortened, and the surface obdurability is obviously improved. The high-strength-and-ductility gray pig iron surface tissue form heating power reconstruction method is simple in process procedure, easy to operate and suitable for large-scale batched production.

The invention provides a metal anticorrosive material, and a preparation method thereof, and belongs to the field of anticorrosive material. The metal anticorrosive material comprises following raw materials, by weight, 70 to 80 parts of epoxy resin, 20 to 30 parts of a mixed solvent, 0.5 to 3 parts of a flexibilizer, 0.2 to 0.5 part of an antifoaming agent, 4 to 16 parts of a phenolic amine epoxy hardener, 1.2 to 3.2 parts of an anti-aging agent, 0.1 to 1.5 parts of an anti-oxidant, 0.1 to 0.8 part of a lubricant, 0.5 to 1.3 parts of a thixotropic agent, 1 to 3 parts of a pigment, and 15 to 25 parts of a filling material. The preparation method comprises following steps: 1, raw material weighing; 2, dissolving; 3, blending; 4, defoaming; and 5, impurity removing. The metal anticorrosive material is excellent in levelability, thixotropy, and impervious performance, high in surface toughness and adhesive force, is more friendly to the environment, is longer in service life; and no pin hole is formed.

The invention provides a heat-resisting and anti-corrosion material. The heat-resisting and anti-corrosion material is composed of, by weight, 50-60 parts of high-molecular resin, 3-5 parts of auxiliaries, 10-15 parts of mixed solvent, 3-5 parts of benzoic acid, 4-6 parts of chitosan, 8-12 parts of sodium diacetate, 10-12 parts of calcium propionate, 2-4 parts of pigment, 10-15 parts of filler, 10-20 parts of curing agent and 6-8 parts of water. The heat-resisting and anti-corrosion material is high in adhesive force, high in solidification, environmentally friendly and economical and has a good heat-resisting effect.

The invention discloses fiber marble paint which is composed of the following raw materials by weight: 110-120 parts of silicone-acrylic emulsion, 4-6 parts of hydroxyethyl cellulose, 2-3 parts of dodecyl mercaptan, 0.1-0.3 part of tributyltin trichloride, 0.8-1 part of diacetone acrylamide, 5-7 parts of glass fiber, 0.4-1 part of 2-mercaptobenzimidazole, 2-4 parts of octyl epoxy stearate, 10-13 parts of bentonite and 2-3 parts of aluminum stearate, the bentonite is treated by cellulose, the surface toughness of the bentonite is effectively improved, then by surface treatment, the surface activity of the bentonite is improved, dispersion compatibility between the bentonite and the silicone-acrylic emulsion can be enhanced, and the uniform stability of a finished paint film can be improved.

The invention relates to the technical field of leather, and discloses high-brightness surface mirror resin for medium-hardness synthetic leather. The resin is prepared from the following raw materials in parts by weight: 160-200 parts of resin, 3-5 parts of a curing agent, 5-9 parts of a solvent, 10-20 parts of a chain extender, 2-4 parts of a catalyst, 1-3 parts of aluminum powder and 2 5-10 parts of polymer diol. According to the high-brightness surface mirror resin for the medium-hardness synthetic leather, as well as a preparation method and an application of the high-brightness surface mirror resin, 160-200 parts of resin is put in a reactor, heated to 150-200 DEG C and stirred for 3-10 minutes, 1-3 parts of aluminum powder, 2-4 parts of catalyst and 5-10 parts of polymer diol are added, the high-brightness surface mirror resin prepared in claim 1 for the medium-hardness synthetic leather is heated to 60-70 DEG C, adhered to a PU resin layer and insulated for 10 minutes. A high-brightness layer prepared from the high-brightness surface mirror resin prepared in claim 1 for the medium-hardness synthetic leather has excellent elasticity and surface toughness and cannot be easilyscratched, and permanent indentation cannot be left during extrusion.

The invention discloses a method for preparing photocatalyst dried polyester paint and belongs to the technical field of coating preparation. Epoxidized soybean oil in acrylate emulsion has strong oxidation resistance and can achieve an effect of promoting cured crosslinking of the polyester paint. A hydroxyl condensation dehydration reaction between the epoxidized soybean oil and acrylate is carried out so as to form a network interpenetrating crosslinked structure, the epoxidized soybean oil contains epoxy groups, ether bonds, hydroxyl and other polar groups and active groups and is combinedwith titanium dioxide to prepare photocatalyst dried powder, synergistic effects and photosensitization are achieved between carbon nano tubes and titanium dioxide molecules, the photocatalytic activity of the nano titanium dioxide can be improved, the photocatalytic efficiency is improved, degradation and volatilization of the titanium dioxide on polluting solvents can be enhanced, and a dryingeffect is achieved. Moreover, toxic and harmful gases in air such as formaldehyde can be effectively degraded, multiple types of bacteria can be effectively killed, and the polyester paint has deodorization property and anti-fouling performance and is wide in application prospects.

A coating method for a friction part according to the present disclosure includes the steps of: fabricating a wire comprising, by weight, 0.1% to 1.0% of La₂O₃ and a balance of Mo; and applying, by flame spraying, the fabricated wire to a surface of the friction part, whereby the friction part has improved wear resistance.

The invention belongs to the technical field of plastic material preparation, and particularly relates to a preparation method of an anti-aging water-permeable plastic runway. The preparation method comprises the following steps: mixing and dispersing mixed monomers, a pre-emulsifier and water to obtain water-permeable paint; mixing isophthalic acid, neopentyl glycol and trimethylolpropane, and adding cyclohexanedicarboxylic acid, carboxylated asphalt, an anti-aging modification filler and the like to obtain anti-aging toughened polyester paint; and firstly spraying the anti-aging toughened polyester paint on a plastic runway base layer, then spraying a silicon dioxide/titanium dioxide composite hydrosol for impregnation and modification, and finally smearing the water-permeable paint to obtain the anti-aging water-permeable plastic runway. According to the invention, carboxylated asphalt and polyester resin are subjected to decarboxylation polymerization for improving the surface toughness of cured polyester resin, meanwhile, the carboxylated asphalt can serve as an electron acceptor for improving absorption of ultraviolet light by titanium dioxide, the photoinduced hydrophilicityof the whole plastic runway polyester coating can be improved through doping of silicon dioxide, water accumulation is not likely to happen, and the application prospect is wide.

The invention provides a continuous cast-rolling forming method and a continuous cast-rolling forming device for a bicontinuous-phase composite board. The method includes that a prefabricated and formed porous ceramic board is fed into a metallic solution; the metallic solution infiltrates into porous ceramic under the action of pressure to form a bicontinuous-phase composite material; the surface of the composite material formed in the infiltration step is rolled, and a metal board layer is formed on the surface of the composite material through cooling. By the method, one-step continuous forming of the bicontinuous-phase composite material can be realized, metal phase mechanical property is improved, and wear, heat and corrosion resistance performance of the material is enhanced.

The invention discloses a concrete anti-cracking modifier, which is made by the following raw materials in parts by weight: 2.5-5 parts of periodate ligin, 1.2-1.8 parts of 4-isooctyl phenol, 1.5-2.8 parts of tributyl citrate, 0.8-1.5 parts of dehydroacetic acid, 2.3-2.8 parts of acacia gum, 5-10 parts of corn protein powder, 1.5-2.6 parts of tri-benzyl phenol polyoxyethylene ether and 0.5-1.1 parts of formaldehyde. Compared with the existing concrete modifier, the concrete anti-cracking modifier has features of high surface toughness, low brittleness and improved low-temperature stability of concrete. By adopting the anti-cracking modifier, the concrete has features of reduced thermal conductivity, reduced heat absorption value, increased thermal resistance and cold resistance, reduced temperature susceptibility and better high/low temperature stability of the asphalt concrete. The anti-cracking performance of roads of the concrete is improved, and furthermore the service life of the roads is prolonged and the maintenance cost is reduced.