393 results about "Caustic substance" patented technology

This invention relates to a process for preparing 4-nitrodiphenylamine and 4-nitrosodiphenylamine to be used for 4-aminodiphenylamine as an intermediate of antiozonant, wherein carbanilide is reacted with nitrobenzene in the presence of an appropriate base, while simultaneously adding aniline to the mixture so as to regenerate some amounts of carbanilide as a starting material. According to this invention, 4-nitrodiphenylamine and 4-nitrosodiphenylamine can be prepared in a higher selectivity and conversion rate via a continuous reaction by recycling carbanilide, a starting material, while adding a certain amount of aniline during the process. Further, the amount of waste water can be significantly reduced compared to the conventional method without any corrosive materials harmful to the environment.

A process for preparing the nano-SiO2 coated carbonyl iron particles includes such steps as dispersing SiO2 nanoparticles and carbonyl iron particles by grinding, modifying the surface polarity of both particles by soluble caustic substance, coating the SiO2 nanoparticles on the surface of each carbonyl iron particle by physical adsorption, backing in vacuum or protective atmosphere, grinding, sieving and packing.

A method for preparing hollow carbon balls belongs to the field of novel carbon material. The existing preparation method for hollow carbon balls has the problems such as use of strongly corrosive substances, high cost and the like. The invention obtains the product hollow carbon balls by 1) preparing polystyrene micro ball template with uniform diameters; 2) adding the polystyrene micro ball template into concentrated sulphuric acid for sulfonation to obtain polystyrene micro ball template with different sulfonation degrees by controlling sulfonation time; 3) using phenolic resin and sulfonated polystyrene micro ball template to prepare polystyrene/phenolic resin composite balls; and 4) carbonizing the composite balls. The method of the invention is simple, convenient and easy to execute, uses no corrosive substances, has low production cost, can be used as electrode material, energy and hydrogen storage material, lubricant, catalyst carrier and the like.

It is an object of the present invention to provide a clear coating composition which inhibits a corrosion reaction by containing a rust preventive agent in a clear layer on a silver-plating layer and preventing a corrosive substance such as chlorine ion from contacting with the surface of the silver-plating layer, and develops beautiful silver-plating design for a long time, and an inmold decoration product comprising a silver-plating layer. A clear coating composition used in forming a multilayer coating film comprising a silver-plating layer, said multilayer coating film being obtainable by forming a base coating film layer, a silver-plating layer and a clear coating film layer in succession on a plastic substrate, wherein said clear coating composition is a two-package polyurethane coating composition comprising a main material containing acrylic polyol and a curing agent containing a polyisocyanate compound, the equivalence ratio of an NCO group in said polyisocyanate compound to an OH group in said acrylic polyol (NCO/OH) ranges from 0.8/1 to 1.2/1, and the clear coating composition contains a rust preventive agent in the proportions of 1.0 to 13.0 parts (on a basis of solids weight) with respect to 100 parts by weight of the total of the acrylic polyol and the rust preventive agent.

The present invention relates to the preparation of cyclic peptide, and is especially new Fmoc-solid phase process of preparing Eptifibatide. The new process is superior to liquid phase process, which has long synthesis period, and BOC solid phase process, which uses virulent and corrosive material. The technological scheme is that the Eptifibatide preparing process includes the following steps: eliminating Fmoc protection of Fmoc-Rink Amide AM resin to obtain H2N-Rink Amide AM resin; connecting various protective amino acids successively to obtain corresponding resin; eliminating Fmoc-protection radical and Kaiser test to detect reaction procedure; preparing S-triphenyl mercapto propionyl-N, N-ditert butyl oxycarbonyl-homoarginine with lysine; grafting S-triphenyl mercapto propionyl-N, N-ditert butyl oxycarbonyl-homoarginine; eliminating side chain protecting radical and resin to reduce into coarse product; and cyclization, oxidation, HPLC tracking purification to obtain pure product.

A housing, particularly for a Light Emitting Diode (LED) or otherwise lamped in-grade or under-water light fixture, is made of ceramic material, such that the housing is not affected by corrosive substances commonly found in soil, masonry, and water that surrounds the installed fixture. The ceramic housing establishes a good conductor of heat and does not conduct electricity. A lens and lens frame are secured to the housing and provisions are made to assure the integrity of the overall assembly even when the light fixture is employed in damp and wet environments and/or where heavy loads can bear down on the lens, such as when the light fixture is embedded in a paved roadway and subjected to vehicular traffic rolling there over.

The invention discloses a nickel electroplating liquid, and a preparation method for a super-hydrophobic nickel plating layer using the same. The nickel electroplating liquid is composed of a choline-chloride-based ionic liquid used as a solvent and NiCl2.6H2O or NiCl2 used as a solute, wherein the mol concentration of the solute is 0.1-3 mol/L. The preparation method for the super-hydrophobic nickel plating layer using the nickel electroplating liquid comprises the following step of electroplating in the nickel electroplating liquid with pure nickel as an anode and the workpiece to be electroplated as a cathode at the temperature of the nickel electroplating liquid from room temperature to 200 DEG C and electroplating voltage of 0.2-2 V. The nickel electroplating liquid provided by the invention has simple components, is convenient to prepare and is environmentally-friendly. The preparation method for the super-hydrophobic nickel plating layer using the nickel electroplating liquid has the advantages of simple and controllable process, no corrosive substances and no vapor discharge during the electroplating process, and is beneficial to mass production. More prominent characteristics are that the obtained nickel plating layer has super-hydrophobic property, a contact angle larger than 160 degrees and a sliding angle smaller than 2 degrees.

The invention discloses phenyl MDT silicon resin and a preparation method thereof. The phenyl MDT silicon resin adopts single-group organic silane as a M link, adopts two-group organic silane as a D link and adopts three-group organic silane as a T link, wherein at least one of the D link or the T link is the phenyl silane, and the phenyl silane is collectively hydrolyzed under an acidic catalyst and concentrated under an alkaline catalyst. Raw materials for the phenyl MDT silicon resin are available, no strong corrosive substance is generated in the reaction process, and the requirement on equipment and operation is low. The preparation method comprises the following steps of adding the acidic catalyst in the mixed liquor of the M-link silane, the D-link silane and the T-link silane. The M link, the D link and the T link are unnecessary to drop into a reactor respectively, so that the operation step is simple, the procedure is saved, the production efficiency can be improved, and the industrialized mass production can be realized. The refractive index nD of the prepared phenyl MDT silicon resin is more than 1.53.

An object of the present invention is to solve problems in that aluminum electrodes, aluminum wires, and I/O terminals are corroded by corrosive gasses when a pressure of a pressure medium containing corrosive matters such as exhaust gas is measured with a semiconductor sensor; and improve not only the corrosion resistance of the sensor chip but also the corrosion resistance of the portion particularly functioning as the pressure receiver.

Each of the aluminum electrodes that is likely to be corroded portions is prevented from being corroded by forming a titanium-tungsten layer and gold layer on the aluminum electrode. The connecting wires are prevented from being corroded by corrosive matters by using gold wires. The I/O terminals are also prevented from being corroded by applying gold plating.

The invention relates to an ion-sensitive field effect transistor, comprising a gate (36) consisting of carbon nitride. The carbon nitride gate (36) is highly resistant to aggressive substances to be measured and also exhibits good adhesive properties. In addition, the ion-sensitive field effect transistor has high long-term stability and negligible drift. Said ion-sensitive field effect transistor can be produced in a method that uses CMOS-compatible planar technology.

The invention discloses an environment-friendly electroplate liquid for a copper base plating layer, wherein a choline chloride-based deep eutectic solvent is used as a electroplate liquid solvent; every liter of the electroplate liquid contains 0.1-1 mol of CuCl2.2H2O or CuCl2 and 0-10 g of a composite plating layer additive; the composite plating layer additive is one or a mixture of some of nano carbon tube powder, SiC powder, diamond powder and Al2O3 powder; and the choline chloride-based deep eutectic solvent is the mixed liquid of choline chloride and glycol in the molar ratio of 1: 2, or the mixed liquid of the choline chloride and urea in the molar ratio of 1: 2. The electroplate liquid is featured with simple ingredient, convenience in preparation and environment friendliness. The process in which the electroplate liquid is used for electroplating the copper base plating layer is simple and controllable, and the electroplate liquid contains no corrosive material and has no steam discharging in the electroplating process. The surface of the acquired copper base plating layer is even, and especially in the process of electroplating a copper base composite coating, the electroplate liquid is not needed to be mechanically stirred, which simplifies the composite electroplate technology, and is helpful for the large-scale production.

The invention discloses a composite material pipeline. The composite material pipeline is characterized by comprising a pipeline main body, wherein the pipeline main body comprises a tubular conductive liner; the conductive liner is provided with a pipe cavity; a first fiber enhanced resin layer covers the outer surface of the conductive liner. According to the composite material pipeline, the conductive liner is made of a titanium alloy or thermoplastic resin, has an excellent anti-corrosion performance on corrosive substances in the pipeline, and can be used for resisting corrosion of most of salts, acids and alkalis, and particularly can resist the corrosion of acidic gas including hydrogen sulfide, carbon dioxide and the like. The non-metal first fiber enhanced resin layer covering the outer surface of the conductive liner is a main stress layer, can bear gas pressure or liquid pressure in the pipeline, can resist the corrosion caused by chlorides in seawater outside the pipeline, and can effectively prevent the electrochemical corrosion to the pipeline and the liner; furthermore, the corrosion resistance of the pipeline is improved.

The invention discloses a polyurethane reinforced material which is characterized by comprising a component A and a component B, wherein the component A comprises the following components in parts by weight: 20-45 parts of polyether polyol A, 25-55 parts of polyether polyol B, 5-10 parts of polyether polyol C, 5-15 parts of a flame retardant A, 5-10 parts of a flame retardant B, 0.2-0.5 parts of an amine catalyst, 0.1-0.5 parts of a tin catalyst and 0.5-1.0 parts of a foam stabilizer, and the component B is polymethylene polyphenyl polyisocyanate. The polyurethane reinforced material further comprises 3-8 parts of a viscosity reducer. Compared with similar materials, the material has better permeability and higher mechanical property, and broken coal and rock masses can be fixedly combined integrally and effectively due to ultrahigh tensile compressive strength and binding performance, so that the top plate and two uppers can bear pressure actively. The material does not contain poisonous volatile and corrosive matters, so that the material satisfies the demand of safety and environment-friendliness of materials under the shaft.

A polyvinyl acetal film as an intermediate film for a laminated glass, can provide a laminated glass that exhibits a low degree of yellowness and excellent surface appearance, and is useful as a sealing material or intermediate film that can prolong the life of a laminated glass provided with a solar cell or functional unit. The content of corrosion-causing substance in the polyvinyl acetal film is low, so that the polyvinyl acetal film permits high-temperature lamination and ensures excellent productivity. A solar cell module and a laminated glass are prepared using the polyvinyl acetal film. A plasticized polyvinyl acetal film which comprises 15 to 60 parts by mass of a plasticizer having a total number of 28 or more of carbon atoms and oxygen atoms constituting a molecule based on 100 parts by mass of a polyvinyl acetal resin, and which has an acid value of 5.0 meq/kg or less.

The invention relates to a waterproof anti-corrosion flame retardant coating for an airplane and a preparation method thereof. The coating is prepared from tung oil, ethylene-vinyl acetatecopolymer emulsion, decabromodiphenyl oxide and magnesium hydroxide according to the weight ratio of 60-80:10-30:5-10:5-10. The waterproof anti-corrosion flame retardant coating for the airplane uses the tung oilhaving the characteristics of waterproof property, anticorrosion, high temperature resistance, and the like as the main material, matches the decabromodiphenyl oxide and magnesium hydroxide with theflame retardant function and uses the ethylene-vinyl acetatecopolymer emulsion as the adhesive. Therefore, when applied on the surface of a structural component of the airplane to form an adhesive film with the waterproof, anti-corrosion and flame retardant effects, the waterproof anti-corrosion flame retardant coating can prevent material lamination or even damage caused when the external moisture and corrosive substances enter the inside of the structural component and has flame retardant effect, thereby prolonging the service life of the structural component and ensuring good safety.

The invention discloses a method for preparing an UV (ultraviolet)-curable high-temperature-resistant and corrosion-resistant organic silicon/silica hybrid coating. In the method, tetraethoxysilane is taken as an inorganic phase precursor, methyltriethoxysilane and diphenyldimethoxysilane are taken as organic phase precursors, then the mixed liquor of gamma-methacryloxy silane and a free-radical photo-initiator is added, and an UV-curable organic silicon/silica hybrid sol can be prepared by using a sol-gel method; and after a base material is coated, the base material is cured by ultraviolet light for 30-300s so as to obtain an organic silicon/silica hybrid coating, thereby forming hybrid gel space network structure taking Si-O-Si bonds as a skeleton. The method disclosed by the invention has the following technical effects: the hybrid coating subjected to ultraviolet-light curing forms a denser network structure, thereby facilitating the improvement of comprehensive properties, and especially facilitating the improvement of corrosion resistance; and the denser network structure can form a physical 'barrier' better so as to prevent corrosive substances such as water and chemical reagents and the like from contacting a substrate.

An anticorrosive coating used on the inner wall of a desulfurization and denitrification device comprises a main paint component A and a curing agent component B. The main paint component A comprises, by weight, epoxy resin, phenolic resin, nano-silicon dioxide, diatomite, ceramic micro-powder, glass powder, carbon black, a dispersing agent, a flatting agent, a defoaming agent, barium sulfate, an antirust agent, a 1# solvent, graphene nano-platelet powder and activated carbon. The curing agent component B comprises, by weight, a modified amine hardener and a 2# solvent. The weight ratio of the component A to the component B is 3.5-4.5:1. The anticorrosive coating is used for corrosion prevention of the inner wall of a dust remover of the desulfurization and denitrification device, is convenient to apply, corrosion of highly corrosive flue gas (such as SO<2>, NO<x>, HF and HCl) to the steel inner wall is effectively prevented, corrosion of highly corrosive liquid (such as H<2>SO<4>, HCl and HF) is effectively prevented, and meanwhile a paint film formed by the anticorrosive coating has very high abrasion resistance, temperature endurance and cold and hot shock resistance.

A method of optimizing system parameters in a crude unit to reduce corrosion and corrosion byproduct deposition in the crude unit is disclosed and claimed. The method includes measuring or predicting properties associated with the system parameters and using an automated controller to analyze the properties to cause adjustments in the chemical program to optimize the system parameters. Adjusting the system parameters effectively controls corrosion in the crude unit by reducing the corrosiveness of a fluid in the process stream and/or by protecting the system from a potentially corrosive substance. System parameter sensing probes are arranged at one or more locations in the process stream to allow accurate monitoring of the system parameters in the crude unit.

The invention discloses a carbon fiber/epoxy resin composite material comprising solid epoxy resin, a curing agent, an organic phosphorus fire retardant and carbon fiber, wherein the solid epoxy resin is formed after liquid epoxy resin is crosslinked and cured, and the curing agent is used for crosslinking and curing the liquid epoxy resin. The carbon fiber/epoxy resin composite material takes the organic phosphorus fire retardant as the fire retardant, and a decomposition product of the fire retardant and a combustion product of fire retardant epoxy resin contain fewer corrosive substances and toxic substances, so that secondary pollution to the environment is greatly reduced. The organic phosphorus fire retardant is strong in solubility and easier to disperse in epoxy resin. The organic phosphorus fire retardant as the fire retardant in the carbon fiber/epoxy resin composite material is low in usage and good in fire retardant effect. The carbon fiber/epoxy resin composite material is simple in preparation method and easy for large-scale production.

A method and apparatus for the descaling of metal surfaces without the use of caustic substances is provided. The apparatus includes a first and second blast heads containing fan shaped nozzles that spray high velocity jets of smooth edged, ceramic media at a scale covered continuous sheet of steel. The continuous sheet of steel is advanced into an abrading station containing a pair of brush assemblies that include stainless steel bristled brushes. The stainless steel brushes engage the surface of the sheet of steel and abrade away the cracked scale, leaving a surface clean of scale. The surface produced is pH neutral and therefore resists additional corrosion and does not require oil coatings, or other protective treatments. The metal surface is produced with a roughness that is less than 2.5 microns Ra without stretching, polishing, cold-rolling or the use of acid pickling. Eliminating these steps makes for a faster, more robust process and saves considerable cost.

The invention relates to a method for preparing ion exchange fiber materials. The method takes fibers such as polytetrafluoroethylene, polypropylene, polyacrylonitrile and polyvinyl alcohol which still have good stability and integrity in an extreme environment as a substrate, prepares the strong-acid and weak-acid bifunctional ion exchange fiber materials by pre-irradiation grafting, and provides products with more superior performance for application (such as purification of strong acid reagent and strong alkali reagent) of the ion exchange fiber materials under harsh conditions. The static adsorption capacity of the products can be controlled to be between 3.0 and 4.98 mmol/g, wherein the static adsorption capacity of strong acid parts is between 1.85 and 2.57 mmol/g. The method has high pre-irradiation grafting efficiency, avoids huge waste of monomers in mutual irradiation, can make the grafting ratio realize controllable operation, avoid utilization of strong corrosive materials such as concentrated sulfuric acid and chlorosulfonic acid for sulfonation reaction, avoid environmental pollution and equipment corrosion, has simple process and easy operation, and provides favorable conditions for industrialization of the ion exchange fiber materials.

The invention discloses a rubber film. The rubber film comprises, by weight, 100 parts of rubber, 15 to 45 parts of a hardening agent, 1 to 3 parts of a yellowing-resistant agent, 1 to 5 parts of a vulcanizing agent, 1 to 5 parts of a vulcanizing accelerating agent, 1 to 3 parts of an aging resistant agent and 1 to 10 parts of an inorganic pigment. The rubber film has high chemical inertness, resists high-corrosivity substances such as acids and alkalis, has certain hardness and deflection, has good luster and an appropriate color, has a low production cost and an appropriate price, can effectively satisfy demands, and is scratched difficultly or has wear resistance.