35results about How to "Improve acid corrosion resistance" patented technology

This invention discloses a method for Ni plating by chemical deposition including: oil elimination, washing, Zn replacement, washing, Zn replacement, washing, Ni chemical-plating, washing and drying. This invention applies an advanced and simple Ni-chemical deposition method, combines a method of high and low NiP and Zn-dip to operate them independently so as to replace the traditional Ni-plating and the continous process method.

The invention discloses a preparation method of a composite coated cerium sulfide red pigment. The preparation method comprises the steps that firstly, colorant suspension liquid containing gamma-Ce2S3 toner is hydrolyzed by a solution containing Zr<4+>, and after a hydrolysis product is dried, first-time coated precursor powder is prepared; secondly, first-time coated precursor powder suspension liquid is hydrolyzed by a solution containing Si<4+>, and after a hydrolysis product is dried, second-time coated precursor powder is prepared; finally, the second-time coated precursor powder is subjected to calcining treatment in a non-oxidation atmosphere, and then the composite coated cerium sulfide red pigment which has a zirconium oxide-silicon oxide composite coating layer and is densely coated is prepared. The invention further discloses a product prepared through the preparation method. According to the preparation method, by means of stepped hydrolysis-composite coating, reacting is easy to control, effective coating of the surface of cerium sulfide is improved, the preparation process is stable and reliable, and obtaining of the cerium sulfide red pigment with the dense and compact coating layer is promoted. The preparation technology is simple and easy to operate, and the prepared product is high in stability and suitable for industrial popularization.

The invention discloses high-temperature vulcanized modified silicon rubber which is mainly prepared from the following base materials: 110-1 methyl vinyl silicone rubber, 110-2 methyl vinyl silicone rubber and 110-3 methyl vinyl silicone rubber at the weight ratio of (1-2):(2-5):(1-3). The high-temperature vulcanized modified silicon rubber has the advantages of all excellent property of high-temperature vulcanized silicon rubber and better ultraviolet resistant property and acid etching resistant property. According to the IEC62217 standard, after the high-temperature vulcanized modified silicon rubber is aged through ultraviolet light (xenon-arc method) for 1500 hours, the material is intact; after the high-temperature vulcanized modified silicon rubber is soaked in a 65% nitric acid solution for 45 minutes, the material is intact.

The invention belongs to the technical field of chemical coatings, and particularly relates to low-VOC (volatile organic compound) super-curing repairing varnish and a preparation method thereof. Thelow-VOC super-curing repairing varnish provided by the invention is mainly prepared from a component A and a component B; the component A is mainly prepared from polyol super-curing resin, fluoro-modified acrylic resin, overbranched polyester polyol resin, a solvent, a leveling agent and an organic tin dryer; the component B is mainly prepared from low-viscosity aliphatic polyisocyanate, xylene and n-butyl acetate. The low-VOC super-curing repairing varnish provided by the invention can reduce the VOC content using use of coating and relieve the environmental pollution; furthermore, the low-VOC super-curing repairing varnish also has the advantages of formation of a bright varnish film, high fullness, high hardness, scratching resistance, aging resistance, straining resistance and the likein a use process.

The invention discloses high-solid-content high-performance glycidyl tertiary carboxylic ester modified alkyd resin and a preparation method thereof, and belongs to the technical field of coatings. The resin is prepared from glycidyl tertiary carboxylic ester, acrylates and monomers, an initiator, vegetable oleic acid, polybasic acid, polyhydric alcohol, an antioxidant, a solvent and the like. Thepreparation method comprises the following steps: firstly, synthesizing an alkyd resin prepolymer through esterification polycondensation reaction and reflux dehydration, and then synthesizing the high-solid high-performance glycidyl tertiary carboxylic ester modified alkyd resin from the alkyd resin prepolymer, acrylates, monomers and glycidyl tertiary carboxylic ester according to a specific raw material ratio through a chemical synthesis modification method. By introducing glycidyl tertiary carboxylic ester, the water resistance, the acid resistance, the alkali resistance and the like areimproved. Compared with common acrylic acid modified alkyd resin, the high-solid-content high-performance glycidyl tertiary carboxylic ester modified alkyd resin has lower viscosity and a proper amount of reactive groups, and is better in miscibility with other resins, and a paint film formed after crosslinking is improved in weather resistance and has excellent water resistance and acid corrosionresistance.

The invention belongs to the technical field of electromagnetic wave absorbents, and particularly relates to a preparation method of cross-linked resin coated flaky carbonyl iron powder. According to the preparation method, the flaky carbonyl iron powder is coated with the resin in a cross-linked network structure, a coating layer cannot be dissolved and damaged by a solvent and an external environment, and the coating firmness is greatly improved; and firstly, good contact with the flaky carbonyl iron powder can be ensured by utilizing the flexibility of the resin, and secondly, the characteristics of heat resistance, oxidation resistance, electrochemical corrosion resistance and acid corrosion resistance are ensured by a cross-linked network structure. According to the preparation method, the corrosion resistance of the flaky carbonyl iron powder is effectively improved, the flaky carbonyl iron powder with excellent chemical and electrochemical stability is prepared so as to be better applied to an electromagnetic wave absorbent of a military target, and an effective technical path is provided for improving the corrosion resistance of the flaky carbonyl iron powder.

The invention discloses lead-free low-temperature glass for manufacturing a diode glass shell. The glass mainly contains the following components in percentage by mass: 40 to 60 percent of SiO2, 10 to 25 percent of B2O3, 1 to 10 percent of P2O5, 10 to 25 percent of Li2O, Na2O and K2O, 1 to 10 percent of MgO, CaO, SrO and BaO, 0.5 to 10 percent of Al2O3, 0.5 to 5 percent of TiO2, 1 to 10 percent of ZnO, 0 to 5 percent of F2, and 0 to 2 percent of clarifying agent, wherein the clarifying agent can be one or more of Sb2O3, CeO2 and/or As2O3. The lead-free low-temperature glass has very excellent acid corrosion resistance, and meets the requirement of a diode planting process for acid resistance of the glass shell. In addition, the expansion coefficient of the lead-free glass is matched with that of a Dumet wire, the softening temperature does not exceed 630 DEG C, and the glass can be stably sealed with the Dumet wire at the temperature of below 700 DEG C.

The invention discloses a rust removing liquid capable of preventing a steel surface from being damaged by excessive acid etching, and relates to the technical field of metal surface treatment. A specific method comprises the following steps of 1) preparing PSSA modified ferroferric oxide nanoparticles; 2) preparing lanthanum doped nano titanium dioxide; 3) preparing silver-lanthanum doped nanometer titanium dioxide nanometer particles; 4) carrying out modification treatment by adopting polyethyleneimine silver-lanthanum doped nanometer titanium dioxide nanoparticles; and 5) uniformly mixing raw materials to obtain a component A and a component B, and putting the components into a container bottle with a middle interlayer to obtain the required rust removing liquid. According to the provided rust removing liquid, rust on the steel surface can be efficiently removed, and depositing can be carried out on a base steel surface to form a acid-corrosion-resistant nanoparticle layer which issmooth, uniform and compact on the whole so that organic acid can be effectively prevented from carrying out acid corrosion on base steel, the hydrogen embrittlement phenomenon of the steel can be avoided, and then the damage of the rust removing liquid to the steel in the rust removing process is reduced.

The invention discloses a protective material, which is prepared by mixing 100 parts of Portland cement, 100 to 250 parts of natural fine sand, 0.15 to 0.20 part of dura fiber, 5 parts of moisture migration inhibitor and 3 to 8 parts of metakaolin. The invention further discloses application of the protective material as a protective layer for building surfaces and in the repair of corroded partsof buildings. The raw material varieties of the protective material disclosed by the invention is few, raw material proportioning and grain size gradation are scientific and reasonable, the waterproofeffect is outstanding, and the corrosion of concrete buildings caused by water quality can be effectively prevented; moreover, when the protective material is used as a repairing material, construction is convenient, and the difficulty of construction is greatly decreased.

The invention discloses a preparation method for anti-aging silicone rubber used for compression seal products. The method comprises the following steps: stirring spherical aluminum oxide particles, monomethoxypolyethylene glycol and dichloromethane, adding hydroxypropyl methacrylate and ethylene oxide, continuing stirring, adding hydrochloric acid and a polymerization inhibitor, sending the obtained material to a seal reaction kettle, performing heating and performing stirring under the protection of nitrogen gas, allowing the stirred material to stand, performing cooling, and performing washing to obtain a first material; stirring methyl vinyl silicone rubber, nitrile silicone rubber, heavy calcium carbonate, the first material and a structure controlling agent, adjusting the temperature, and allowing the material to stand under vacuum, so as to obtain a second material; and heating the second material, allowing the heated second material to stand, adding cyclohexane peroxide, performing mill run, performing primary vulcanization, and performing secondary vulcanization to obtain the anti-aging silicone rubber used for the compression seal products. The obtained silicone rubber provided by the invention has excellent mechanical properties and electrical properties, excellent ultraviolet resistance and acid corrosion resistance, and good heat resistance, wherein the thermal conductivity can reach 5.8W/(m*K).

The invention discloses a preparation method of low-fluorine silicone rubber used for a ceramic composite insulator. The preparation method comprises weighing 100 parts of methyl vinyl fluorosilicone rubber, 6-9 parts of precipitated silica, 18-25 parts of a fire retardant, 3-7 parts of zinc stearate, 2-6 parts of activated magnesium oxide and 2-5 parts of ferric oxide powder according to a ratio, and uniformly mixing in a double-roller mixing mill so as to prepare a uniform master batch, performing banburying on the master batch in a kneader at 170 DEG C at a vacuum degree of -0.09 MPa for 10-20 min, then adding 0.1-0.3 part of dicumyl peroxide, again performing banburying at 200 DEG C for 3-5 h, and leaving overnight, so as to prepare the low-fluorine silicone rubber. The prepared low-fluorine silicone rubber possesses excellent performances of fluorosilicone rubber, overcomes problems of silicon rubber, is resistant to ageing, possesses excellent acid and alkali resistance, is strong in hydrophobicity, is affordable, and helps to effectively save cost.

The invention discloses a preparation method of high-strength anti-fracture concrete. The preparation method sequentially comprises the following steps: treating cement paste; mixing the cement mortar; mixing coal ash and the cement mortar; prefabricating and mixing an expanding agent and a water reducing agent; pretreating phenolic resin; mixing sodium alginate and sodium monofluorophosphate; andfinished product synthesis. According to the preparation method of the high-strength anti-fracture concrete, the expanding agent is doped into the concrete, a special expansion source is generated bythe expansion component, the fracture reason of the concrete after pouring is air humidity, and the proportion of the concrete during blending; The problem of cracking caused by shrinkage of concretein each setting period in the prior art can be solved, the net shrinkage value of the concrete in each age is ensured to be always less than the ultimate tensile value of the concrete, and the crackresistance of the concrete is effectively enhanced. The modified phenolic resin is added, the modified phenolic resin solves the problem of poor deformability with a concrete cured product, and can make the concrete resistant to aging.

The invention discloses molding powder for electrostatic spraying of an LOC box. The molding powder comprises the following components in parts by weight: 30-35 parts of epoxy resin, 25-30 parts of polyester resin, 10-15 parts of hydroxyl-containing fluorocarbon resin, 4-8 parts of tri-beta-methyl glycidyl isocyanurate, 1-3 parts of triglycidyl isocyanurate, 0.5-1 part of a pigment, 25-30 parts ofa filler, 2-3 parts of a leveling agent, 0.5-1 part of a moisture-proof agent, 0.5-1 part of a corner modifier, 0.5-1 part of benzoin and 1-1.5 parts of a coupling agent. The molding powder has goodcorrosion resistance and high temperature resistance.

The invention belongs to the field of oil exploitation aids, and especially relates to an ultrahigh strength corrosion resistant composite ceramic fracturing propping agent. The propping agent comprises following components in percentage by weight: 80 to 85 wt.% of high pure ultrafine Al2O3; 1 to 3 wt.% of ultrafine kaolin, 10 to 15 wt.% of ultrafine ZrO3, 0.5 to 1.0 wt.% of CaO, 0.3 to 0.5 wt.% of SiO2, 0.3 to 0.8 wt.% of MgO, and 2.0 to 3.5 wt.% of lignin. The raw materials are mixed, blended, aged, and granulated, and then the particles are moulded, compacted, screened and sintered to prepare the fracturing propping agent with a controllable diameter of 100 to 900 [mu]m. The prepared fracturing propping agent has the advantages of high strength, good corrosion resistant property, and high roundness, and can be widely used in fields of deep mining, super deep mining, and deep sea oil and gas exploitation, and the preparation method is innovative.

The invention relates to the technical field of semiconductor manufacturing, and discloses a third-generation semiconductor contact window structure and a manufacturing method thereof. The manufacturing method comprises the following steps: providing a substrate, and depositing a compound epitaxial layer on the substrate; depositing a first metal layer on the compound epitaxial layer through a metal evaporation process; depositing an isolation layer on the compound epitaxial layer and the first metal layer; a through hole is correspondingly formed in the portion, located above the first metal layer, of the isolation layer and penetrates through the isolation layer, and the inner wall of the through hole is an inclined cambered surface; and depositing a second metal layer on the isolation layer and the through hole through a metal evaporation process. Damage and impurity ion pollution to a lattice structure on the surface of a compound epitaxial layer by a metal sputtering process are effectively prevented, and the contact impedance of a third-generation semiconductor contact window structure is reduced.