74results about How to "Eliminate pinholes" patented technology

The invention relates to a polyurethane anti-corrosion priming paint sprayed on a steel structure in an abyssal environment. The priming paint is polyurethane modified epoxy solvent-free priming paint; after being subjected to polyurethane modification, the epoxy solvent-free priming paint has higher compressive strength than a common solvent-free epoxy coating, and has higher adhesion strength with the steel structure and sprayed polyurethane. After the matching of the polyurethane modified epoxy solvent-free priming paint and the spray polyurethane, the drawing strength between the whole coating and the steel structure is tested to be larger than or equal to 10 MPa. The polyurethane modified epoxy solvent-free priming paint solves the problems of low compressive strength and polyurea adhesion strength of the common solvent-free epoxy priming paint used in the abyssal environment, and also solves the problem of low steel structure adhesion strength of a polyurethane type priming paint in the abyssal environment.

The invention relates to a preparation method of an intermediate-temperature magnesium strengthening porcelain and a product prepared from the intermediate-temperature magnesium strengthening porcelain. The formula of the strengthening porcelain comprises the following billet materials and glaze materials by weight percent: the billet materials: 30% to 45% of sintered talc, 20% to 35% of raw talc, 5% to 15% of feldspar, 10% to 18% of kaolin, 3% to 5% of bentonite and 0% to 15% of quartz; the glaze materials: 20% to 40% of feldspar, 5% to 15% of calcite, 4% to 8% of kaolin, 0% to 15% of quartz, 3% to 5% of ZnO, 3% to 5% of BaCO and 20% to 35% of glass materials. The preparation method comprises the following steps: carrying preparation, molding, drying, billet biscuiting, glazing, drying and intermediate-temperature glaze firing on the billet materials and the glaze materials under the conditions that the biscuiting temperature of a billet is controlled within 1240 DEG C to 1260 DEG C, the heat preservation time of the billet is 30 minutes, the firing time of an intermediate-temperature glaze is 1100 DEG C and the firing time of the intermediate-temperature glaze is 30 minutes, thereby obtaining the strengthening porcelain with a good glaze surface quality and a high glossiness. Thus, the method has a wide application prospect.

The invention relates to wet-process polyurethane resin for high-density shoe leather. The polyurethane resin is prepared from isocyanate, a polyether polyol mixture, a chain extender and N, N-dimethylformamide serving as an organic solvent. Polyoxytetramethylene-ethylene epoxide copolyether diol and polyoxypropylene diol are taken as macromolecular polylol raw materials for reacting, the raw materials have high hydrolysis resistance and the polyurethane resin can be endowed with high low-temperature flexibility and rebound resilience, so that the prepared high-density shoe leather has finer folds, high durability and high low-temperature adaptability, and recovers quickly. On the aspect of synthesis technology, a special process for stepwise reaction of two polyether polyols is designed,so that a macromolecular structure is more regular, and advantages of the two polyether polyols can be brought into play.

The invention discloses an investment casting pouring method of a thin-wall aluminum alloy casting. In the method, before casting pouring, a formwork is heated to a relatively high temperature (700+/-50 DEG C), so that the cooling speed of alloy liquid is reduced, and the alloy liquid can completely fill a formwork cavity for sure so as to obtain a casting with a qualified shape; and moreover, the poured casting is taken out of the formwork and then immediately put on a cooling bracket to be forcibly and quickly cooled, and thus the defects of pinholes and shrinkage porosity of the casting can be eliminated.

The invention provides a novel foil producing device for an electrolytic copper foil. The novel foil producing device for the electrolytic copper foil comprises a foil producing machine anode unit (10) which is electrically connected with a positive electrode and a cathode roller (20) which is electrically connected with a negative electrode, wherein the cathode roller (20) comprises a roller surface (21) which is used for producing the foil and edge portions (22) which are arranged on the two sides of the roller surface (21), the surface roughness of the roller surface (21) meets the following requirements that Ra is less that 0.2 mm, Rz is less than 1.5 mm, and the edge portions (22) are formed by performing oxidation treatment through hydrogen peroxide.

The invention relates to a production process of an adhesive fabric, particularly relates to a production method of a multi-layer composite adhesive fabric, and solves the technical problem that the adhesive fabric is loose and coarse in surface and extremely poor in protection property due to the fact that bubble, pinhole and sponge phenomena often exist on the surface of the adhesive fabric as a result of identical curing points of each adhesive layer in the multi-layer adhesive fabric production process in the prior art. The production method of a multi-layer composite adhesive fabric comprises the following steps: 1, component preparation: preparing components of two adhesives; 2, compounding: respectively compounding the two adhesives; 3, adhesive cement preparation: preparing adhesive cements of the two adhesives; 4, adhesive coating: coating the adhesive cement of a second adhesive on two faces of a nylon fabric, and then coating the adhesive cement of a first adhesive on one face of the nylon fabric; and 5, curing to obtain the multi-layer composite adhesive fabric. According to the formula of the process provided by the invention, the quality of the product is greatly improved; and the product is smooth and beautiful in surface, and has very good protection property against various corrosive substances.

The invention relates to the technical field of sealants, more specifically relates to a sealant, in particular to an acrylate modified polyurethane sealant and a preparation method thereof. The acrylate modified polyurethane sealant is prepared from the following raw materials in parts by weight: 20 to 60 parts of acrylic acid modified polyurethane resin, 1 to 10 parts of liquid acrylate, 15 to 35 parts of a plasticizer, 20 to 50 parts of filler, 0.5 to 3 parts of an adhesion promoter, 0.05 to 3 parts of a catalyst, 0.05 to 3 parts of a water removal agent and 0.05 to 3 parts of a stabilizer.According to the invention, the acrylate modified polyurethane resin is adopted; the addition type liquid acrylate resin is matched; the prepared sealant is used in a later natural environment; the energy of ultraviolet irradiation can be transferred to acrylate bonds, so that the acrylate bonds are slowly crosslinked, carbamate bonds in a sealant system are protected, meanwhile, due to crosslinking of acrylate, the weather resistance of the sealant is further improved, the cohesiveness is wide, and the outdoor service life of the polyurethane sealant is prolonged.

The invention relates to a process for producing three-dimension nerve microelectrode, belonging to micro mechanical-electric technical field. The invention comprises using silicon chip as substrate, grows a bottom layer SiO2 at the front face of the silicon chip, forming a metal alloy layer on the bottom layer SiO2 and etching metal interconnecting lines, press welding points and contact round points, then growing a top layer SiO2 at the front face of the bottom layer, using buffer HF acid solution to etch the top layer SiO2, to expose the press welding points and the contact round points, and using photo resist to stuff the press welding points, rotationally coating SU-8 adhesive at the front face of the silicon plane structure of the contact round points, via photo-etching and etching techniques to form a cylinder holes, and using photo resist to stuff the press welding points, plating and growing metal in the cylinder holes, to form metal cylinders, uses development to remove the photo resist in the press welding points to expose the press welding points, and finally washing to obtain three-dimension multi-path microelectrode array. The invention can reduce production cost, improve the height controllability of microelectrode, and improve the consistence of each path.

The invention mainly relates to the technical field of ceramic glaze processing and discloses corrosion-resistant environment-friendly glaze for tiles. The glaze is prepared from, by weight, 37-39 parts of silicon dioxide, 26-28 parts of barite, 24-26 parts of barium feldspar, 17-19 parts of pyrophyllite, 14-16 parts of kaolinite, 5.2-5.6 parts of tin oxide, 4.5-4.9 parts of niobium pentoxide, 4.1-4.5 parts of tungsten oxide, 3.4-3.8 parts of cerium oxide, 2.3-2.7 parts of cobalt oxide and 0.3-0.5 part of graphene. The glaze can eliminate pinholes and bubbles, thereby avoiding glaze shrinkage,enabling the surfaces of the tiles to be exquisite and bright and having high resistance to acid and alkali corrosion, and after glazing, sintering is low in temperature and short in time, energy issaved, and environment is protected; cobalt oxide is added for calcining modification after pyrophyllite is smashed, so that hardness and glossiness of pyrophyllite powder are improved, the surfaces of the tiles are made smooth and exquisite, and corrosion resistance is enhanced.

The invention discloses a thermosetting powder coating additive and a preparation process thereof, belongs to the technical field of coatings, and aims to provide an additive with functions of promoting wetness to eliminate shrinkage cavities of a coating film so as to obtain the smooth, bright and plump coating film, and eliminating pinholes caused by by-products with low boiling points or water absorbed in pigment fillers during the coating curing so as to improve the toughness of the coating film and enhance the hardness of the surface of the coating film. The additive is generally suitable for thermosetting powder coatings (a plane high-gloss type, a semigloss type or a non-gloss type). In addition, the invention further discloses a preparation process of the thermosetting powder coating additive.

The invention discloses high-imitation electroplating bonding silver powder paint which comprises the following components in parts by weight: 80-90 parts of terminal carboxyl group polyester resin, 6-8 parts of isocyanate triglycidyl ester, 10-15 parts of organic silicon resin, 5-10 pars of terpene resin, 1-3 parts of polyacrylate, 0.3-0.7 part of benzoin, 0.5-1 part of a fluorescent whitening agent, 1-2 parts of a bonding aid and 0.6-1 part of coating type aluminum powder. The invention further provides a preparation method of the high-imitation electroplating bonding silver powder paint. The preparation method comprises the following steps: weighing and blending materials, premixing the materials, performing melting extrusion, grinding, bonding, screening, and packaging a finished product, thereby obtaining the high-imitation electroplating bonding silver powder paint. By adopting the high-imitation electroplating bonding silver powder paint and the preparation method thereof, effects of high smoothness, high clarity, high brightness and high leveling properties of an electroplated surface are achieved by adjusting the melting viscosity, clarity, surface tension, glass transition temperature, bonding temperature, bonding time, bonding speed and powder flowability of a formula.

The invention relates to a high-temperature high-grade magnesia porcelain preparation method, wherein the billet material comprises, by weight, 30-45% of burned talc, 20-35% of raw talc, 5-15% of feldspar, 10-18% of kaolin, 3-5% of bentonite, and 0-15% of quartz, and the glaze material comprises, by weight, 20-40% of feldspar, 5-15% of calcite, 4-8% of kaolin, 0-15% of quartz, 3-5% of ZnO, 0-5% ofBaCO3, and 20-35% of frit. According to the preparation method, billet material and glaze material preparation, molding, drying, biscuit firing of billet body, glazing, drying, and medium temperatureglaze burning to obtain the product, wherein the biscuit firing temperature is 1280-1300 DEGC, the thermal insulation is 30 min, the medium temperature glaze burning temperature is 1200 DEGC, and thethermal insulation is 30 min. According to the present invention, with the preparation method, the product with advantages of good glaze surface quality and high glossiness is obtained so as to achieve broad application prospects.

The invention discloses a ceramic slushing forming device. The ceramic slushing forming device comprises a rotating device with a water wheel type and a slushing device, wherein a plurality of mold frames for placing molds are arranged on the rotating device, and the mold frames are distributed in the circumferential direction of the rotating device; the slushing device comprises a slurry storagetank, a stamping pump, a slurry conveying pipe, a communicating pipe and a plurality of spray heads, wherein one end of the slurry conveying pipe is connected with the stamping pump, the other end ofthe slurry conveying pipe is connected with the communicating pipe, and the spray heads are rotatably connected with the communicating pipe; and the low end of the communicating pipe is fixedly connected with a fixed seat, the fixed seat is further provided with a transmission device, a first push-pull device and a second push-pull device are arranged at the lower end of the fixed seat, and the fixed seat moves up and down through the first push-pull device and the second push-pull device. The ceramic slushing forming device is suitable for processing ceramic products with various shapes, a formed blank has uniform thickness, pinholes of the blank can be eliminated, automatic control is adopted, the cost is reduced, and the efficiency is improved.

The invention relates to a low-temperature high-grade magnesia porcelain preparation method, wherein the billet material comprises, by weight, 32% of burned talc, 26% of raw talc, 10% of feldspar, 15%of kaolin, 4% of bentonite, 10% of quartz, and 3% of calcium carbonate, and the glaze material comprises, by weight, 24% of feldspar, 14% of calcite, 6% of kaolin, 14% of quartz, 3% of ZnO, 4% of BaCO3, 25% of frit, and 5% of strontium oxide. According to the preparation method, billet material and glaze material preparation, molding, drying, biscuit firing of billet body, glazing, drying, and medium temperature glaze burning to obtain the product, wherein the biscuit firing temperature is 1120-1180 DEGC, the thermal insulation is 30 min, the medium temperature glaze burning temperature is 1100 DEGC, and the thermal insulation is 30 min. According to the present invention, with the preparation method, the product with advantages of good glaze surface quality and high glossiness is obtained so as to achieve broad application prospects.