101results about How to "No pinholes" patented technology

The invention discloses a deplating solution and a deplating method thereof for tin-nickel coating (commonly called plated scrap) on the surface of brass. The deplating solution comprises oxidizer, accelerator, complexing agent and inhibitor, and the deplating solution is prepared by adding water to the reagents, stirring, dissolving, then putting in a water bath and slowly heating. The oxidizer adopts 65-68% nitric acid, the accelerator adopts 36-38% hydrochloric acid, the complexing agent adopts citric acid and the inhibitor adopts benzotriazole. After being deplated by the deplating solution of the invention, the surface of the brass is bright, the color of the substrate is basically unchanged, and the brass has no pinholes and small corrosion amount.

The invention discloses an automatic tungsten inert gas (TIG) gasket-free single-side welding and double-side molding process for aluminum alloy, which comprises the following steps of: selecting welding equipment and materials, performing assembly and clearing, performing tack welding, clearing grease dirt and oxide films in 50 millimeters of two sides of a groove by using acetone and a stainless steel wire wheel, placing a shell on a welding operation rack, regulating a welding gun to be aligned with the groove, preheating, welding a first layer without adding welding wires, clearing the oxide film on the surface of the seam by using the stainless steel wire wheel after the first layer is welded to expose metal luster, welding a second layer, adding the welding wires for covering the surface, and making the welding direction of the welding gun and a cylinder swing vertically to form a seam. The process has the advantages of high efficiency, low labor intensity, high welding quality, attractive appearance, no undercut or arc crater cracks, workpiece deformation resistance and high seam qualification rate.

The invention provides a graphene field effect transistor terahertz wave modulator and a manufacture method thereof and aims to increase the modulating speed and depth of the graphene field effect transistor terahertz wave modulator. The graphene field effect transistor terahertz wave modulator comprises a semiconductor substrate, and a medium layer, a graphene film and source and drain electrodes which are arranged on the substrate, and an annular grating electrode which is arranged on the back of the substrate. The terahertz wave modulator is characterized in that the medium layer is an Al2O3 layer, and the thickness ranges from 5 to 100nm; the Al2O3 is deposited by the ALD (atomic layer deposition) method, and the Al2O3 is high in evenness, is free of defects and pores and has better voltage resistance; the leakage current is reduced greatly. The modulating speed of the terahertz wave modulator can be 178 KHz, the corresponded modulating depth is larger than 22%, and the modulating speed and depth are increased significantly; the terahertz wave modulator can be widely applied to the fields of terahertz wave communication systems, terahertz wave detection and terahertz wave imaging.

The present invention discloses one kind of heat resistant anticorrosive composite polyphenylene sulfide epoxy paint and its preparation process. The anticorrosive paint consists of primer, finishing paint and intercoat paint. The primer consists of polyphenylene sulfide, epoxy resin, glass scale and cyanamide dimmer. The finishing paint consists of polyphenylene sulfide, epoxy resin, silicon carbide, 4, 4'-diamino diphenyl sulphone and cyanamide dimmer. The intercoat paint consists of polyphenylene sulfide, epoxy resin, silicon carbide, glass scale, dihydrazide sebacate and 4, 4'-diamino diphenyl sulphone. The anticorrosive paint produces no sag, and can form homogeneous and smooth coating with excellent physical and chemical performance, high heat resistance, high corrosion resistance, high impact strength, and high insulating performance.

The invention discloses a method for preparing a masking microstructure, and belongs to the technical field of microelectronic mechanical systems. The method comprises the following steps: preparing a silicon dioxide mask of which thickness is 1 to 2mu m on the surface of a silicon substrate, patterning the mask, and deeply etching silicon to form a micro-groove or micro-opening structure; carrying out surface passivation for the micro-groove or micro-opening structure; removing a bottom passivation layer of the micro-groove or micro-opening structure by etching, and pre-etching the bottom of the micro-groove or micro-opening structure; next, continuously carrying out isotropic etching to form a microstructure; then, removing the mask on the surface of the silicon substrate and the passivation layer on the side wall of the micro-groove or micro-opening structure; and backfilling the microstructure to form the masking microstructure. The method uses the thick mask to well protect the surface of the silicon substrate so as to avoid the phenomenon of pinholes and under etching. Because the isotropic etching of the masking microstructure is carried out after the pre-etching, the section shape of the masking microstructure can be controlled, the complex process parameter adjustment is avoided, and the dependency on precision etching equipment is also avoided.

The invention relates to a nickel sulfamate electroplating solution which comprises nickel sulfamate, boric acid and nickelous chloride. A formed nickel-plated layer which has favorable stability and is continuous and complete without pinholes, bubble shedding and residual stress is formed after a metal surface is plated by the electroplating solution. The smoothness and the brightness of the obtained plated layer are improved after a certain amount of brightener is added to the electroplating solution so that the metal surface is smoother and more attractive.

The invention provides a sulfate trivalent-chromium chromeplate electroplating solution and an application method thereof. Amine compounds and organic compounds containing nitrogen, sulfur, acetylenicalcohol and the like, which are used as brighteners, are added into a basic electroplating solution containing chromium sulfate and conducting salt; hydroxylamine hydrochloride or ascorbic acid is added for stabilizing trivalent chromium in the electroplating solution, substances such as polyethers and polyalcohols are added as surfactants, and low carbon chain material complexing agents such asoxalic acid, propionic acid, glycine and succinic acid are added for complexing trivalent chromium ions, so that the cathodic reduction of the trivalent chromium complex ions is greatly promoted, andthe tolerance of the electroplating solution to impurities and the stability of the electroplating solution are further improved; the brighteners and the surfactants also can promote the cathodic reduction of the trivalent chromium ions, and appropriate processing parameters are cooperatively set, so that the reaction effects of all components can be greatly improved; the sulfate trivalent-chromium chromeplate electroplating solution can enable plating to have excellent appearance, morphology, structure, binding force and corrosion resistance, and enables the plating not to have surface defects such as pinholes and stripes.

The invention relates to coten base enamel and glazeslip thereof. The contents of some ingredients in the chemical component of coten are excessive for production of the enamel and are unbeneficial to the quality of a product; the key for overcoming the adverse factors is to determine suitable special base enamel capable of ensuring the enamel quality and the physicochemical property. The coten base enamel comprises the following components: 57.80-59.30 parts of SiO2, 32.06-2.70 parts of Al2O3, 1.80-2.80 parts of K2O, 10.98-11.35 parts of Na2O, 12.76-16.05 parts of B2O3, 2.80-1.00 parts of Li2O2, 3.80-4.80 parts of CaO, 0.60-1.50 parts of CoO, 1.401-2.00 parts of NiO, 0.20-0.80 part of Fe2O3 and 1.40-2.00 parts of MnO. The coten base enamel is utilized as an acid resistant and anticorrosive coten heat transfer element coating.

The invention discloses an organic silicone modified phenolic resin encapsulating material and a preparation method and usage thereof. The encapsulating material comprises the following components in parts by weight: 15-19 parts of modified phenolic resin, 3-5 parts of titanium white, 1-2 parts of organic silicon, 50-64 parts of silicon micro powder, 5 parts of pigment, 3 parts of thixotropic agent, 5 parts of drying agent and 4-7 parts of curing agent. The preparation method of the encapsulating material comprises the following steps: spraying, extrusion, crushing and ball milling. The encapsulating material has the advantages of high pressure resistance, temperature difference resistance, good insulating property, good moisture proof performance, high mechanical strength, quick natural drying, stable electric property, good adhesion, no cracking before and after curing, no color variation and the like, the production efficiency is increased by 20%, the output rate is improved by 10%, the manufacturing cost is reduced, the encapsulated product has a bright and attractive surface, is green and environment-friendly, and can replace an imported encapsulating material. The organic silicone modified phenolic resin encapsulating material is mainly used for the dipping encapsulation of porcelain medium capacitors, ceramic filters, thermistors and other electronic components.

The invention relates to a stereoscopic surface woodgrained ceramic tile, a stereoscopic surface woodgrained ceramic tile emboss effect glaze layer and a decoration technology. The ceramic tile is composed of a green body layer, a cover glaze layer, an emboss effect glaze layer, a pattern decoration layer and a surface protective glaze layer which are sequentially compounded. The stereoscopic surface woodgrained ceramic tile emboss effect glaze layer comprises the following materials including, by weight, 2.5-3 parts of zinc oxide, 20-30 parts of feldspar, 15-20 parts of frit, 10-12 parts of washed kaolin, 8-10 parts of calcite, 8-10 parts of burning talc and 20-30 parts of home-made quartz. The decoration technology comprises the steps that (1) long-strip-shaped green bodies are obtainedby pressing woodgrained brick powder, the surfaces of the green bodies are coated with cover glaze, and formulated emboss effect glaze materials are printed on the surfaces of the green bodies, coatedwith the cover glaze, in a rubber covered roller engraving mode; (2) decoration is performed by means of ink jet patterns, and the ink jet patterns cover the glaze surface and the printed emboss effect glaze on the whole; and (3) the green bodies are coated with clear protective glaze, and then kiln firing is performed.

Disclosed is a large area electric brush palladium plating technique on the surface of stainless steel, which belongs to special electroplating field. The shortcomings of electroless palladium plating are that the electroless palladium plating is unsuitable to plate in large area and unsuitable to construct and repair in the spot. The technique of the invention comprises surface preliminary treatment and electric brush plating steps, which is characterized in that plating solution comprises palladium salt Pd (NH3)4C12. The measure of the plating solution is measured by quality of Pd: 5-12g/L, NH4C1: 50-125G/l, (NH4)2PO4: 50-100g/L, polyoxyethylene sorbitol anhydride single laurate: 0-0.002ml/L, NH3,H2O: 10ml-80ml/L, the left is water, and the pH measure of the water is 7-8. Processing parameter is as follows: voltage: 5V-10V, plating pen is utilized as anode, work piece is utilized as cathode, the speed which the plating pen relates to the work piece is 8-12cm/s, and the temperature is normal temperature. The invention has the advantages of large area plating in the spot, fast speed of plating, simple operation, low cost respectively, and good environmental protection performance, and furthermore the invention can immensely improve anti-corrosion capability of the stainless steel after being plated.

The antiskid polyurethane paint is prepared with tolylene diisocyanate, polyether N210, trihydroxymethyl propane, butyl acetate, acetone, dibutyltin dilaurate, benzoyl chloride, antioxidant, 1,2-propylene glycol and water absorbent, and through dewatering butyl acetate, acetone and polyether N210 in reactor at 90-100 deg.c; adding trihydroxymethyl propane into the reactor before heating and stirring to dewater; adding benzoyl chloride, antioxidant and tolylene diisocyanate, heating and adding dibutyltin dilauratel; reflux evaporating solvent butyl acetate or acetone; packing the prepolymer into paint tank; and mixing prepolymer, xylene or butyl acetate or acetone, 1,2-propylene glycol and water absorbent in certain proportion to obtain the paint. The paint has simple preparation process,strong adhesive force, high wear resistance, high weather resistance and other advantages.

The invention discloses a processing technology of a zinc-nickel plating alloy. The processing technology comprises the following steps: S1, pretreatment; S2, surface oil removal; S3, cleaning; S4, etching and activation; S5, plating; S6, passivation treatment; S7, surface treatment; and S8, inspection. During actual use, a zinc-nickel alloy coating layer is plated on the surface of a workpiece; the high-strength bonding force with a workpiece can be realized; the zinc-nickel plating alloy plating layer is fine in appearance, free of pinholes and free of blistering; the attractiveness of the workpiece is further improved; meanwhile, after the workpiece plating is finished, the surface is treated by a treatment liquid; the surface of the workpiece can be further protected, so that the workpiece has good thermal stability, corrosion resistance and oxidation resistance, the surface of the workpiece soaked in the treatment liquid is smooth and complete, and holes and redundant parts are avoided; the process is easy to operate, and the corrosion resistance of the plating layer is still superior to that of a pure zinc plating layer after the plating layer is processed.

The invention discloses a polyurethane waterproof flame-retardant paint and a preparation method thereof. The paint comprises polyurethane prepolymers, diacetone acryloamide, buty stearate, titanate coupling agent TMC-311 and titanium pigment. The paint further comprises polydimethyl siloxane, white carbon black, mixed solvent and flame-retardant materials. The preparation method comprises the following steps: dissolving the diacetone acrylamide by ethanol of which the volume concentration is 65-80%, wherein the adding amount of the ethanol is 1.5 kilograms in per kilogram of diacetone acrylamide on the basis of weight; mixing the dissolved diacetone acrylamide with the polyurethane prepolymers in a reaction kettle, wherein the reaction temperature is 75-119 DEG C and the reaction time is 1.2-1.5 hours; adding the titanate coupling agent TMC-311 into the mixture and further reacting for 3-6 hours; then adding buty stearate, the rutile-type titanium pigment, polydimethyl siloxane, the flame-retardant materials, the white carbon black and the mixed solvent into the mixture and uniformly mixing, so that the polyurethane waterproof flame-retardant paint product is obtained. The paint prepared by the preparation method is good in waterproof and flame-retardant effects, friendly to the environment and not easy to age.

This invention relates to a pipeline anti-corrosion protective material of polyurea elastomer. Its technical program is: A component is isocyanate, and B includes the weight components of following materials: 45-55% of amid-capped propylene oxide compound, 6-15% of diethyl toluenediamine, 5-7% of 2,4-diamido-3,5- methylthio chlorobenzene, 3-8% of DMS toluenediamine, 5-7% of N, N'-dialkyl diamine, 4-6% of N, N'- dialkyl methyl diamine, 2-5% of phosphite triester, 1-2% of fumed silica, 1-3% of organobentonites, 1-2% of silica. This invention advantages: fast setting, influence-free of temperature and humidity, strength, flexibility, high wear-resistance, anti-aging, anti-corrosion. It is particularly applicable to overhead and buried pipes, municipal sewage pipes, oil pipelines, gas pipelines and a variety of steel chemical storage tank.

The invention belongs to the technical field of coatings, and concretely relates to a low-VOC automobile varnish and a preparation method thereof. The low-VOC automobile varnish is prepared by mixinga component A with a component B according to a weight ratio of 1:1; the component A comprises 78-84% of polyol resin synthesized by using hydroxybutyl acrylate as a hydroxy monomer, 3-7% of hyperbranched polyester polyol resin, 3-6% of a nano-silica oily liquid, 4-8% of ethyl 3-ethoxypropionate, 2-6% of dimethyl nylon acid, 0.1-0.6% of a leveling agent and 0.01-0.06% of an organotin drier; and the component B includes 74-84% of a curing agent and 16-26% of a solvent. The varnish has a construction viscosity of 20 s/25 DEG C (Tu-4 cup) or less and a construction solid content of 80% or above,meets the requirement of the VOC content being equal to or less than 200 g/L during construction, and also has the advantages of simple formula, low cost, and high performances of a paint film.

The invention discloses a high-performance water-based single-component automobile finish paint applicable to a compression process. The automobile finish paint consists of two parts, namely a finishpaint B1 and a finish paint B2. The invention also discloses a preparation method of the automobile finish paint. According to the invention, the automobile finish paint can meet the requirements of along mainstream B1B2 spraying process (a compression process) used for main engines of various automobiles at present and has excellent workability; due to the fact that a core-shell structure micro-gel emulsion is used, the automobile finish paint has extremely high drainage capacity and is free of paint film defects such as pinholes and miliaria under wet spraying process conditions; and the finish paint B1 has a high-humidity film Tg which has a strong supporting effect on the later coating B2, and therefore, the phenomenon of paint film layer mixing can be effectively reduced, and the appearance of the paint film is improved.

The invention discloses a method for coating plastic products, comprising the following steps of treating a surface by a nonionic surfactant, drying the surface, spraying adhesive primer, spraying plain colored paint and polyurethane varnish and the like. The nonionic surfactant is sprayed and washed, therefore, the quality of a coating is more stable and reliable, no pinholes and dulling situation exist, and uniform luster is provided on the surface; in addition, the coating construction process is simple with mild conditions.

The invention relates to the field of refrigeration and especially relates to a marine condenser with a carbon steel and polyethylene hot-melted combined pipe box. The marine condenser is mainly used for solving the technical problems of the prior art that a zinc block is corroded when the zinc block is adopted by the condenser for protecting a pipe box, the pipe box is detached and overhauled, a gasket is manufactured again, the operation is troublesome, the position and the construction of the zinc block are specially designed, the parts of the pipe box are increased, the structure of the equipment is more complex, and the like. The marine condenser comprises a cylinder, wherein a front pipe plate and a rear pipe plate are respectively arranged at front and rear two ends of the cylinder; a front pipe box and a rear pipe box are respectively connected with the front and rear pipe plates; a water inlet and a water outlet are arranged on the front pipe box; a plurality of heat exchange pipes are arranged in the cylinder; a refrigerant inlet and a refrigerant outlet are connected with the exterior of the cylinder; plastic lining layers are arranged inside the front pipe box and the rear pipe box; and the plastic lining layers are plastic and steel substrate hot-melted combined layers.

The invention provides a novel environmental protection waterproof paint, and a preparation method thereof. The novel environmental protection waterproof paint is prepared from a polymer emulsion, modified asphalt emulsion, titanium dioxide, hollow glass microsphere, a composite filling material, a polyether polyol, polyether modified silane, glycerol triacetate, a thickening agent, a dispersant,and water. The novel environmental protection waterproof paint possesses excellent water resistance; the coating film surface is smooth and flat; coating film is compact; no pin hole or foam is generated; coating film bonding performance is excellent; peeling from a base layer is not easily caused; the raw materials are low in cost, and are widely available; the preparation method is simple; and the preparation method is suitable for industrialized large scale production.

The present invention discloses an insulated composite aluminum enamelled wire, belonging to the technical field of insulating conductive wire manufacturing. The insulated composite aluminum enamelled wire comprises a conductor, a composite film layer, a Teflon tape, and a nylon-modified glass fiber layer. The conductor is a composite aluminum conductive wire and is coated by the composite film layer. The enamelled wire is coated by the Teflon tape which is coated by the nylon-modified glass fiber layer. By using the design of combining the conductor, the composite film layer, the Teflon tape, and the nylon-modified glass fiber layer, the raw materials are easy to obtain, the operation is simple, compared with an extrusion type Teflon enamelled wire, the specific purchase of a high-temperature extrusion machine is not needed, the preparation can be completed in general equipment, and the industrialization is easily achieved. The insulating voltage of the three-layer insulating enamelled wire is high, since outer sheath composite nylon has superior abrasion resistance, high speed automatic winding is possible, at the same time, the insulation voltage is high, an insulating tape and an insulating space can be saved, three layers of insulation protection are used, and a pinhole phenomenon is avoided.