605results about How to "No crack" patented technology

The present invention discloses a Drug-eluting stent (DES) with multiple coating layer, its preparation method and application. Said stent consisting stent and coating layer convered on the stent surface. It is characterized by that the surface of the stent has 1-4 layers of coating layers, in which at least two layers are medicine-carried layer, and said medicine-carried layer is composed of (wt%) 0.5-99% of polymer, 0-10% of additive and 0.5-99% of active component, and between the medicine-carried layer and stent a base layer can be set so as to raise the anchoring force of medicine-carried layer and stent, and the surface of medicine-carried layer also can be more coated with a surface layer.

The invention provides a method for a preparing TiO2 nanotube array film, relating to a method for preparing a nanotube film. The method solves the problems of the prior art that the prepared nanotube array film features thin film, irregular micro appearance, heterogeneous length of nanotubes, reunion of tube orifice and cracking of the film. The preparation method comprises: 1. a titanium plate is cut into two titanium sheets of the same size, and polishing, ultrasound processing and washing are carried out on the two titanium sheets; 2. electrolyte is prepared; 3. primary anodic oxidation is carried out on the titanium sheets; 4. demoulding is carried out; 5. secondary anodic oxidation is carried out on the titanium sheets; 6. the titanium sheets are dried after ultrasonic processing; and 7. calcination treatment is carried out, thus obtaining the TiO2 nanotube array film. In the invention, twice anodic oxidations are carried out on the titanium sheets, thus producing the TiO2 nanotube array film featuring regular micro appearance, homogeneous, smoothness, thick film layer, reunion-free tube orifice and no cracking. The preparation method of the invention features simple technique and equipment and controllable thickness of the nanotube film.

The invention discloses a solid pattern casting special paint and a preparation method thereof. The mass percentages of various constituents in the paint are: 30-40% of bauxite chamotte, 20-30% of flaky graphite powder, 6.3-8.5% of bonder, 1-2% of iron oxide red powder, 4-6% of suspending agent, 0.8-1.5% of water reducing agent and 20-30% of water. The preparation method comprises the steps: mixing the various components of the solid pattern casting special paint according to the mass percentages and loading the constituents into a ball mill; adding 50-80 ceramic balls with a diameter of 30-50 mm into the ball mill; and mixing and stirring the materials evenly to obtain the paint. Practices show that the paint has strong abrasion performance, high adhesiveness, good air permeability and fast-dry performance both in low and high temperature environments; the paint can satisfy the production requirement of large casting production; the preparation method disclosed by the invention is simple; and the cost is low.

In a chip pick-up process after dicing in an assembly process during manufacture of a semiconductor integrated circuit device it is an important subject to diminish a pick-up defect caused by the reduction in thickness of each chip which is proceeding in quick tempo. Particularly, bending of the chip peripheral portion caused by a peeling operation is very likely to induce cracking and chipping of the chip. In the present invention, to solve these problems, in case of peeling a chip from a dicing tape (adhesive tape) or the like while vacuum-chucking the chip by a chucking collet, the flow rate of a vacuum chucking system in the chucking collet is monitored to check a bent state of the chip before complete separation of the first chip from the adhesive tape.

The invention discloses a distortion-resistance wind power generation cable sheath material and a cable. The cable material comprises the following components in weight parts: 100 parts of chlorinated polyethylene, 10-30 parts of amorphism copolymer, 10-20 parts of cold-resistant plasticizer, 40-80 parts of reinforcing filler, 5-15 parts of nanosacle inorganic active agent, 2.5-5 parts of cross-linking agent, 2-5 parts of cross-linking assistant agent, 1-2.5 parts of antioxidant antiager and 10-30 parts of inorganic fire retardant, wherein the amorphism copolymer is a mixture of amorphism polyolefin thermoplastic elastomer and chlorinated polyethylene elastic body; and the nanoscale inorganic active agent is nanoscale zinc oxide and magnesium oxide. The cable of the invention has low-temperature resistance (-60DEG C)and distortion resistance, excellent flexibility, improves the homogenisieren property of the other materials by adding the nanoscale inorganic active materials, improves the molecular structure, has better flexibility because of the uvio-resistance, and has the characteristics of distortion, cold, oil and corrosion resistance and the like.

The invention discloses a supercapacitor electrode corrosion-resistant conductive coating, which comprises the following components in percentage by weight: 10 to 35 percent of conductive agent, 0.1 to 3.5 percent of dispersing agent, 2.0 to 15 percent of binder, 0.1 to 8.0 percent of pH regulator, and 50 to 70 percent of pure water. The supercapacitor electrode corrosion-resistant conductive coating is prepared by the following steps of: fully mixing and uniformly stirring the components, adding the components into a ball mill for peptizing and dispersing, and discharging to obtain the supercapacitor electrode corrosion-resistant conductive coating. Compared with the conventional like products at home and abroad, the supercapacitor electrode corrosion-resistant conductive coating has the advantages of greatly improving the acid and alkali corrosion resistance, having no bubbles, falling off, corrosion and other phenomena after being soaked in alkaline solution for 120 hours and in acid solution for 32 hours, and improving the conductivity, adhesiveness and drying speed. The product can be diluted and adjusted according to need during use.

Disclosed is a hollow cast ceramic core, which comprises substrate material 80-85% and Mullite 20-15%, wherein the substrate material comprises quartz glass powder 60-80% and silica dioxide porous material 40-20%. Its manufacturing process consists of proportioning, mixing the core material with plasticity agent and right amount of oleinic acid, melting, mixing, press forming, sintering, and carrying out high temperature reinforcement and low temperature reinforcement treatment.

The invention relates to a liraglutide sustained-release micro sphere preparation and a preparation method thereof. The liraglutide sustained-release microsphere preparation comprises 5mg to 100mg of liraglutide, 0.5mg to 10mg of a protective agent and 50mg to 1000mg of a polylactic acid-glycolic acid copolymer, wherein the protective agent is one or a mixture of a plurality of sucrose, mycose, gelatin, mannitol, glycine, lysine and human serum albumin; the molecular weight of the polylactic acid-glycolic acid copolymer is 5000-20000 Daltons, and the ratio of polylactic acid to glycolic acid in the polylactic acid-glycolic acid copolymer is 1:3 to 3:1. According to the liraglutide sustained-release microsphere preparation disclosed by the invention, regular microspheres and medicines uniformly distributed in the microspheres can be obtained by just emulsifying and volatizing an organic solvent; processing procedures are simple; operation is simple; good repeatability is realized in preparation; the prepared liraglutide sustained-release microsphere preparations in batches have no remarkable difference; the obtained microspheres are uniform in grain size, narrow in distribution, controllable in grain size, round and orderly in surfaces and low in burst release rate.

The invention relates to alumina coat slurry and a preparation method thereof, and mainly solves the problems of the prior art of poor stability of a prepared laminar composite carrier and short service life of a prepared thin-shelled noble metal catalyst. The alumina coat slurry comprises the following components: aluminum sol with an average granularity of less than 20 micrometres, active alumina, an organic adhesive, an inorganic adhesive, a surfactant, a pH modifying agent and the balance being water, wherein the average granularity of the slurry is less than 10 micrometres. The preparation method comprises the following steps: dissolving the aluminum sol, the organic adhesive, the surfactant and the pH modifying agent in water; mixing the mixture evenly with stirring at a high speed; then adding the inorganic adhesive and active alumina powder for high-speed dispersion; and regrinding the obtained alumina coat slurry to prepare the alumina coat slurry. Thus, the preparation method better solves the problems by adopting the technical proposal, and can be used in the industrial production of laminar composite carrier.

Provided is an E309L stainless steel lengthened welding electrode capable of being used for large-current welding. A coating contains marble, fluorite, rutile, dehydrated potassium feldspar, dehydrated mica, bismuth oxide, chrome green, magnetite, sodium carbonate, micro-carbon ferro chrome, electrolytic manganese metal, zircon sand, potassium fluoroaluminate, rare earth fluoride, chromium metal and metallic nickel, blending and even stirring are conducted according to the ratio of the coating, 15-20% of sodapotash water glass is added and evenly stirred according to the total weight of the coating, the coating and an ER308L welding wire are put in an oil pressure type welding electrode extrusion press to produce and prepare the lengthened welding electrode, and no coating cracks or flushing can happen when the large current is 170-180 A and the welding core length is 450 mm; though an ER308L welding core is adopted, the cladding metal chemical components meet the requirement of E309L chemical components through the coating transition alloy method, and therefore the welding electrode has good welding process performance and is stable in electric arc, convenient to operate, good in weld appearance during welding, and sediments are easily separated.

The invention relates to a stainless steel material, a welding wire and a welding wire coil; and the material comprises the following components in percentage by weight: 0 to 0.03 percent of C, 0.5 to 1.0 percent of Mn, 0.5 to 1.0 percent of Si, 12.5 to 14.5 percent of Cr, 0.2 to 0.3 percent of Ti, 5.5 to 6.5 percent of Ni, 0 to 0.015 percent of S, 0 to 0.02 percent of P, and the balance Fe and other inevitable impurity elements. When being applied in ferritic stainless steel and martensitic and ferritic dual-phase stainless steel welding, the stainless steel welding material can replace austenitic stainless steel. The stainless steel welding material is applicable to welding under the condition that the heat input is 5 to 7kJ/cm.

The invention discloses a preparation method of a vale control lead-acid accumulator green plate without crackles, for the purpose of removing crackles of plates. The improvement of the invention is characterized in that: a pasted green plate is processed by rolling and acid treatment, in which dilute sulphuric acid of 1.150 g/cm is sprinkled on a compression roller; the green plate is rolled under the compression roller; and the dilute sulphuric acid is attached uniformly to the green plate. Relatively high-density dilute sulphuric acid is used for sprinkling on the green plate by rolling, which leads to thicker lead sulfate coating; water loss of the plate is decreased due to quick drying; uncombined lead existing as active substance during solidifying and drying process reacts sufficiently with oxygen, thus producing better solidifying effect and enhancing the bonding force between the active substance and a slab lattice. The vale control lead-acid accumulator green plate made by the method has smooth plate surface without crackles. Therefore, the quality of the plate is significantly improved.

The invention relates to a hard surfacing sintered flux and a manufacturing method thereof. The sintered flux comprises MgO of 30 percent to 50 precent, CaO of 2 percent to 10 percent, Al2O3 of 10 percent to 20 percent, CaF2 of 18 percent to 28 percent, SiO2 of 10 percent to 20 percent, SiC of 0 percent to 1.5 percent and other components of 0 percent to 5 percent such as ferroalloy mainly playing a role of desoxidation and the like. Material preparation, dry mixing and wet mixing by adding soluble glass into a blender are conducted until granules which have the required sizes are formed, then the granules are dried in a rotary drying way at the low temperature of 200 DEG C to 250 DEG C, and then finished products are obtained by high-temperature sintering in a rotary drying oven at the high temperature of 700 DEG C to 750 DEG C, sieving and packaging. The invention has low flux cost so as to meet the requirements of different hardness, excellent technique and good high-temperature slag detachability; the deposited metal has no gas hole, no crackle but adjustable hardness; and the high-temperature wear-resistance, oxide etch resistance and cold and thermal fatigue resistance of a hot roll are greatly improved.

The invention relates to a method for producing high-density recombined wood, which is used for manufacturing plates and recombined module timber by the following steps of planning, processing by high-temperature steam, drying, dipping glue, draining glue, drying after draining glue, tidying or weaving, balancing for nourishing, pressing to shape, solidifying at a high temperature and the like. The density of the high-density recombined wood can reach 0.7-1.2kg/cm<3>; the high-density recombined wood has the characteristics of peculiar texture, fine grain, excellent performance, small possibility of cracking and deforming and the like, does not need to prevent insects, prevent mildew, prevent corrosion, prevent from cracking and the like, and can be directly used for the fields of floor, furniture, building and the like. The method disclosed by the invention has simple working procedures, and abandoned secondarily secondary small fuel wood and secondary small wood are utilized to produce plates and module wood, thereby changing waste materials into things of value, and greatly saving forest resource. The wood is an ideal log substitute.

The invention discloses a fabrication process of hexagonal flange toothed bolt. In the fabrication process, medium carbon cold heading steel wires are used. The fabrication process mainly comprises the steps of: (1) shearing blanking; (2) preliminarily heading; (3) pressing to form a circular top; (4) pulling to produce a hexagonal product; (5) molding; (6) thread rolling; (7) heating; and (8) electroplating. In the fabrication process of hexagonal flange toothed bolt disclosed by the invention, the cold heading forming technology is adopted to carry out processing, thus the material utilization rate is over 98%, the material is saved, the cost is reduced; by the use of multi-position extrusion, the volumetric deformation and metal flow are more reasonable, fins produced in deformation process are removed, and the resistance to deformation is reduced; by undergoing thermal processing, the bolt has uniform grain and hardness, and is free of cracks; the qualification rate is up to 100%; by electroplating cadmium and titanium, the strength of the bolt is greatly improved, as well as the safety in use.

The invention provides equipment and a method for casting a plurality of aluminum alloy ingots with small diameters by using vertical direct chilling casting (DC) and relates to the equipment and the method for casting the aluminum alloy ingots, which aim to solve the problems of low consistency of metal temperatures, low water cooling uniformity and high possibility of ingot suspension or tension fracture and flow running in each crystallizer in the process of casting the aluminum alloy ingots with the small diameters by the conventional technology for casting the plurality of aluminum alloy ingots with the small diameters by using the vertical DC. The method comprises the following steps of: communicating all branch outlets on runners with a plurality of upper end inlets of hot top caps correspondingly one by one; communicating the lower end outlet of each hot top cap with a crystallizer inlet of the crystallizer, wherein the distances between a flow storage slot and the runners of all crystallizers are same; heating a heat preserving sleeve to the temperature of between 100 and 150 DEG C; opening the outlet of a smelting furnace, feeding molten aluminum alloy into all the crystallizers through the runners, and performing water cooling; stopping for 5 to 10 seconds after the liquid level of the molten aluminum alloy in the runners reaches a preset position; and moving an ingot guiding device downwards. The surface of each ingot is smooth, does not have cracks and has small segregation tumors, and each ingot does not have air pores, is not loose and has small grains.

The invention relates to an elastic polyvinylidene fluoride heat-shrinkable sleeve which is composed of the following components in parts by weight: 85-95 parts of polyvinylidene fluoride plastic, 5-15 parts of fluororubber elastomer, 1-3 parts of antioxygen, 2-5 parts of assistant crosslinker, 3-8 parts of plasticizer, 0.5-2 parts of acid accepter and 2-5 parts of color master. The polyvinylidene fluoride plastic is one or two of the following matters: 1,2-difluoroethene homopolymer and 1,2-difluoroethene- hexafluoropropylene homopolymer. The fluororubber elastomer is one, two or more than two of the following matters: vinylidene fluoride and chlorotrifluor ethylene copolymer, vinylidene fluoride and hexafluoropropylene copolymer, vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene terpolymer. According to the elastic polyvinylidene fluoride heat-shrinkable sleeve, such performances of fluoroplastic as wear resistance, mechanical damage resistance and the like are kept simultaneously, elasticity of the heat-shrinkable sleeve is improved, the elastic polyvinylidene fluoride heat-shrinkable sleeve has such specific performances of fluororubber as oil resistance simultaneously, application scope of the fluoride heat-shrinkable sleeve is broadened and risk in the process of use is reduced.

The invention relates to an energy-saving high-temperature counter radiation resistant inorganic coating for coating the liner of a kiln and a preparation method thereof. The coating mainly comprises oxides, such as cobalt oxide, zirconium oxide powder, aluminum oxide and chromic oxide, and silicon powder, silicon carbide, sodium silicate, aluminium dihydrogen phosphate, silica flour, graphite powder, boron oxide and other components and is prepared by grinding, soaking, heating reaction, stirring and mixing. The coating has high thermal shock resistance, high radiation utilization rate, high corrosion resistance, high cracking resistance, high oxidization resistance and high thermal stability. The inorganic coating of the invention has the advantages of allowing for normal construction without making special modification of the basal body of the kiln, along with small investment, quick response, no toxicity, no corrosion and desirable social and economic benefits.

The invention provides a wear resistant cast iron roll collar used for aligning a steel rail and a preparation method, which belong to the technical field of steel rail processing. The prior wear resistant cast iron roll collar used for aligning the steel rail has the defects of easy occurrence of cracks, complicated manufacture process and the like in quenching process. The method is to compound a wear resistant outer layer with a magnesium iron inner layer into an integral roll collar by centrifuge casting, wherein the wear resistant outer layer comprises the following ingredients in weight percentage: 3.0 to 3.4 percent of C, 1.5 to 2.0 percent of Si, 1.2 to 1.6 percent of Mn, 0.2 to 0.4 percent of Nb, 0.03 to 0.06 percent of RE, 0.03 to 0.06 percent of Mg, 2.5 to 3.0 percent of Ni, 0.4 to 0.6 percent of Mo, 0.8 to 1.2 percent of Cu, 1.5 to 1.8 percent of Cr, 1.0 to 1.4 percent of V, 0.03 to 0.08 percent of B, 0.002 to 0.005 percent of Te, 0.01 to 0.03 percent of Ba, less than or equal to 0.06 percent of P, less than 0.03 percent of S, and the balancing being Fe. The invention has the advantages of high hardness of the roll collar, good wear resistance, simple production process and low production cost.

The invention discloses a preparation method of an ablation-resistant made of a carbon/carbon composite material HfC. The method comprises the following steps of: I, polishing the carbon/carbon composite material, cleaning and drying; II, mixing by ball-milling to prepare slurry; III, uniformly brushing or spraying the slurry onto the surface of the carbon/carbon composite material; and IV, sintering under the protection of inert gas to prepare the ablation-resistant made of the carbon/carbon composite material HfC. By adopting the method, damage on carbon fibers caused by the reaction of HfO2 and C in a substrate modification process is overcame, the permeation capability of Hf is enhanced due to the addition of a rare earth metal oxide and AlN, and the coating is uniform, compact and flawless; in addition, a constituent transition gradient coating is formed between the coating and the carbon/carbon composite material, so that the residue stress of the coating is reduced, the bonding strength between the HfC coating and the carbon/carbon composite material is enhanced, and the high-temperature intensity of the HfC is enhanced.

The invention relates to a rotary niobium oxide target material and a preparation method thereof. The preparation method comprises the following steps: preparing a niobium oxide spraying powder, treating a spraying matrix, spraying a priming coat and spraying the niobium oxide spraying powder on a matrix tube by using a plasma spraying process. The rotary niobium oxide target material prepared by the preparation method provided by the invention has the advantages of compact structure, uniform components, no crack and no limitation on spraying length and diameter; the thickness of the rotary niobium oxide target material can reach 12 mm, the density of the rotary niobium oxide target material is 4.6-5.2 g/cm<3>, and the component of the target is Nb2O4.3-4.9. The preparation method provided by the invention has the advantages of simple and convenient production process and lower cost.

The invention relates to a high-efficiency solar cell back film. The back film is formed by compounding a modified high molecular weight high density polyethylene (HMWHDPE) film with the thickness of 0.08-0.10mm and a modified PET (polyethylene terephthalate) film with the thickness of 0.20-0.22mm. The back film has the following beneficial effects: the back film has a simple manufacturing process and excellent properties; and the solar cell panel packaged with the back film can resist high/low temperature (minus 60 DEG C-120 DEG C), water vapor and erosion of various corrosive gases and liquids, is free from delamination and crack and ensures the standard of stable use for many years.

The invention provides an elastomer modified PVC (polyvinyl chloride) waterproof roll and a production process thereof. The waterproof roll is prepared from the following raw material components in parts by weight: 98 to 102 parts of PVC resin, 30 to 40 parts of plasticizer, 5.8 to 6.2 parts of heat stabilizer, 4 to 6 parts of epoxidized soybean oil, 25 to 50 parts of elastomer CPE, 30 to 50 parts of filler, 5 to 6 parts of titanium dioxide, 1 to 2 parts of stearic acid, 1 to 2 parts of barium stearate, 0.5 to 1.5 parts of antioxygen 1010 and 0.5 to 1.5 parts of ultraviolet light absorber. The modified PVC waterproof roll provided by the invention is good in mechanical property, and long in service life.

The invention discloses a cyanide-free bright electrogilding additive and an application thereof, which belongs to the technical field of electrogilding. The electrogilding additive is prepared from additives and ultra-pure water, wherein the additives are organic additives or mixtures of inorganic additives and organic additives; the concentration of each component in the additive is 0.5-30g/L. The cyanide-free bright electrogilding additive disclosed by the invention has the functions of improving the brightness of a plated layer, refining crystal grains, stabilizing plating liquid and reducing surface tension. Therefore, the additive can be applied to electrogilding plating liquid, and the addition amount is 0.1-100mL/L. By adopting the additive disclosed by the invention, the properties of the plating liquid and the plating layer of a multi-coordination agent cyanide-free electrogilding system can be effectively improved, the plating liquid has no unstable situations of decomposition, precipitation and the like under long-time working condition, and an electrogilding layer which is golden and full bright macroscopically, uniform and compact in micro crystal, flat and crackless can be obtained under the electroplating condition.

The invention discloses a Bayer process red mud and gangue porous sintered brick and a production method thereof. The porous sintered brick is prepared from the following raw materials: 60 to 75 parts of Bayer process red mud; 25 to 35 parts of gangue; 2 to 6 parts of tailings or wastes in chemical plants; and 0.5 to 3 parts of pore-forming agent. The preparation method of the brick comprises the following steps: after dehydrating the Bayer process red mud, mixing and uniformly stirring the Bayer process red mud and other ground raw materials, aging for 1 to 3 days, and adding water to stir aged powder in a stirring machine so as to obtain mud; carrying out extrusion forming on the mud under the extrusion pressure of 1.5 to 2.5MPa by adopting a stiff-plastic process so as to obtain a semi-finished product which accords with the specified dimension and the specified shape; and drying a mold brick and sintering the mold brick in a tunnel kiln to obtain the Bayer process red mud and gangue porous sintered brick. The product reaches the national strength standard of the sintered bricks. In the technology, the total use amount of industrial wastes is close to 100 percent; a large number of farmlands are saved; land resources are effectively protected; and the Bayer process red mud and gangue porous sintered brick and the production method thereof accord with the national policies of saving energy and reducing emission and have obvious environmental benefits, social benefits and economic benefits.

The invention relates to laser-cladding cobalt-based alloy powder and a method for preparing the same and is characterized in that the cobalt-based alloy powder comprises, by mass, 0.1% to 0.4% of C, 3.5% to 5.5% of Si, 1.5% to 3% of B, 1.6% to 2.5 % of Mn, 1.0% to 3.0% of Cr, 0.5% to 2% of W, 0.5% to 3% of Ni, 0.1% to 0.4% of Nb, less than 15% of Fe, 0.2% to 0.3% of La2O3, 0.4% to 0.5% of rare earth Y, and the balance Co and inevitable impurity elements. A technological process for manufacturing the laser-cladding cobalt-based alloy powder includes compounding, smelting, atomizing, drying and screening. The laser-cladding cobalt-based alloy powder is corrosion resistant and high in rigidity, and a laser-cladding layer after treatment has the advantages of being free of cracks, air holes and impurities, compact in organization, fine in crystalline grain and the like. The laser-cladding cobalt-based alloy powder and the method for preparing the same have the advantages that a laser-cladding alloy layer of a large area and thickness and free of cracks can be obtained under the condition that preheating and subsequent heat treatment are not needed, the cladding layer is high in strength, rigidity and abrasion resistance, the plastic toughness is good, the cost is low and the like.

The invention provides a method for quickly manufacturing a titanium alloy artificial biological joint. A three-dimensional model of an affected part joint in the body of a patient is obtained through CT scanning, and the model is amplified in a corresponding proportion according to a contraction ratio; then, an elastic cavity negative mould of the joint is quickly manufactured through 3D printing, titanium alloy powder is evenly and loosely contained in the cavity negative mould in the argon environment and sealed, and a porous titanium alloy joint blank is manufactured through high-pressure cold isostatic pressing; titanium alloy slurry in different particle sizes and even in the nano scale is sprayed to the surface of the blank to build a porosity gradient surface layer; and then, the joint blank is biologically modified through biological agent slurry, the blank is subjected to vacuum drying, degreasing and sintering after surface treatment, and the porous titanium alloy artificial biological joint is obtained. According to personal data, the appearance of the joint is customized, and the joint is good in biological adaptation. Through porosity gradient structural design and biological modification, the joint is good in biocompatibility. Through an oxygen control means, the joint is small in impurity content and high in performance. The production period is short, process stability is high, repeatability is good, and cost is low.

The invention relates to PVC (Polyvinyl Chloride) stone-bumping resistant paint and a preparation method thereof. The PVC stone-bumping resistant paint is formed by mediating, reacting and finely rolling dioctyl phthalate, dibutyl phthalate, dioctyl sebacate, light calcium carbonate, heavy calcium carbonate, nano active calcium carbonate, zinc stearate, barium stearate, organic bentonite, polyamide resin, carbon black, titanium pigment and PVC resin. The low-temperature flexibility of the PVC stone-bumping resistant paint can be improved by compounding three plasticizers of the dioctyl phthalate, the dibutyl phthalate and the dioctyl sebacate; the thixotropic performance of the paint can be improved by combining the organic bentonite with the nano active calcium carbonate; the adhesive force and the high-temperature yellowing resistance of the paint can be enhanced by combining the polyamide resin with heat stabilizers of the zinc stearate and the barium stearate and the paint has no foaming, crack and falling after baked at 210DEG C, so that the coating effect of the automobile body can be improved and the service life of the automobile body can be prolonged. The PVC stone-bumping resistant paint has no lead salt heat stabilizers and avoids the damage to the environment and human body; and the produced PVC stone-bumping resistant paint has excellent performance and can carry out the multilayer anticorrosion protection of the body and the bottom of the automobile.

The invention relates to a resin sand type casting coating and a preparation method thereof, wherein the coating consists of the following components: graphite powder, zircon sand, porzite powder, spodumene powder, sodium bentonite, alkali phenolic resin, silica sol, polyvinyl acetate, carboxymethylcellulose sodium, sodium alkylbenzenesulfonate, fatty alcohol-polyoxyethylene ether and water. The resin sand type casting coating provided by the invention has the advantages of good suspension property, high strength, uniform coating layer and good leveling property. The surface of the dried coating is bright and clean and is free of cavities, bubbles, cracks and the like. After the resin sand type casting coating is used, the cast casting is very high in surface smoothness.

The invention provides laser cladding alloy powder enhanced with oxide particles and a preparation method thereof. The laser cladding alloy powder enhanced with the oxide particles is characterized in that the laser cladding alloy powder enhanced with the oxide particles consists of a matrix alloy powder, the oxide particles and a binder, wherein the proportion is 50-98% of the matrix alloy powder, 1-45% of WC or TiC or a mixture powder of WC and TiC and 1-45% of a combined mixture powder of more than two or one of Al2O3, Cr3C2 and ZrO2. The preparation technological steps of the laser cladding alloy powder enhanced with the oxide particles are preparing the matrix alloy powder, adding the oxide particles, adding the binder, stirring and ball-milling, combining the powder, drying, crushing and sieving. The laser cladding alloy powder enhanced with the oxide particles provided by the invention not only has higher hardness and flexibility, but also has excellent abrasion resistance and corrosion resistance, thereby being quite applicable for the laser cladding of parts under the working conditions of high impact and high abrasion resistance; and moreover, the segregation generated due to great disparity between the proportions of all components can be effectively prevented during the storage, transportation and use processes.