32results about How to "Avoid contact reactions" patented technology

The invention relates to a preparation method of a cold-formed soap. The method has simple process steps, and substitutes traditional aqueous solution of sodium hydroxide with sodium hydroxide or a dispersion of sodium hydroxide and glycerol; sodium hydroxide is completely soluble in glycerol but disperses in glycerol, so as to avoid fast reaction after mixing of sodium hydroxide solution with oil too, reduce the initial reaction rate of saponification, and effectively control saponification reaction rate; along with the saponification reaction, the reaction product of glycerol continuously increases to help more fully dispersion of sodium hydroxide, accelerate the reaction rate of sodium hydroxide and the remaining oil. Since the method employs an anhydrous formula, water evaporation process is not needed after soap formation by liquid soap, and the production cycle is significantly shortened; and the nutrition substances are added in solid form powder to effectively prevent the contact reaction of non-alkali-resistant nutrients and alkali hydroxide molecules, so as to retain the active nutrient ingredients in the soap and give full play to the role of skin care of the nutrients.

The invention discloses a method for preparing a corrosion inhibition waterborne aluminum pigment. The method comprises the following steps: a step (1) of aluminum powder surface elution treatment; a step (2) of surface hydroxylation treatment; and a step (3) of mixing coating treatment. The method for preparing the corrosion inhibition waterborne aluminum pigment is simple and convenient to operate and easy to implement. According to the method, through aluminum powder surface elution treatment, hydroxylation treatment, slow release treatment and coating treatment, the coating stability of the aluminum pigment surface is improved effectively, the aluminum pigment is prevented from being in contact reaction with water or an air medium, the slow release performance of the aluminum pigment is improved remarkably, and the prepared aluminum pigment is high in stability, good in glossiness and wide in application prospect.

The invention discloses a method for preparing a pyrolytic boron nitride material. The method comprises the following steps: putting a substrate mold in an air-carrying atmosphere carrying borazine vapor under a vacuum condition, and pyrolyzing borazine which constantly deposits on the depositing surface of the substrate mold by adopting a chemical vapor deposition method to form the pyrolytic boron nitride material. The preparation method of the pyrolytic boron nitride material has the advantages of simple and easily controlled process, low cost, low energy consumption, high yield, environmental friendliness and the like.

The invention belongs to the technical field of molecular sieve catalysts, and discloses a Pd-based alloy packaged molecular sieve catalyst, a preparation method and applications thereof. The molecular sieve catalyst comprises a sodalite molecular sieve, and PdM nano-alloy particles are packaged in the sodalite molecular sieve; the preparation method comprises the following steps: firstly preparing a sodalite molecular sieve, then impregnating and loading Pd metal and an M metal precursor, roasting and reducing to form a molecular sieve catalyst impregnated and loaded with nano alloy particles; then uniformly mixing with a silica-alumina sol solution, uniformly stirring and mixing the solution, evaporating the solution to dryness, then adding ethylene glycol, grinding the mixture into uniform paste, carrying out hydrothermal reaction, and cooling, washing, drying, roasting and reducing the reaction product to obtain the catalyst. The molecular sieve catalyst is applied to acetylene selective hydrogenation reaction, can avoid an excessive hydrogenation process, and has relatively high acetylene conversion rate and ethylene selectivity.

The invention discloses an antibacterial-enhanced aqueous aluminum pigment with zinc oxide/silver compound powder. The antibacterial-enhanced aqueous aluminum pigment is characterized by being prepared from the following raw materials in parts by weight: 40 to 45 parts flaky aluminum powder, 100 to 110 parts of isopropyl alcohol, 0.3 to 0.35 part of copper sulfate crystal, a proper amount of deionized water, 4 to 4.5 parts of phenolic ether type phosphate, a proper amount of absolute ethyl alcohol, 9 to 10 parts of tetraethoxysilane, 6 to 7 parts of vinyltriethoxysilane, 9 to 10 parts of ammonia water with the weight concentration of 20 percent, 200 to 220 parts of butyl acetate, 5 to 6 parts of crylic acid, 5 to 6 parts of methacrylic acid, 0.6 to 0.65 part of dibenzoyl peroxide, 13 to 15 parts of propylene glycol monomethyl ether, 2 to 3 parts of zirconium phosphate, 4 to 5 parts of nano-zinc oxide, 2 to 3 parts of carboxymethylcellulose, 0.8 to 1 part of sodium polyacrylate, 2 to 3 parts of glycerinum and 4 to 5 parts of a silver nitrate solution with the weight concentration of 10 percent. The product disclosed by the invention can be well dispersed in finished products such as an aqueous coating and ink, and is high in antibacterial property.

The invention discloses corrosion-resistant aqueous aluminum pigment with shielding effects. The corrosion-resistant aqueous aluminum pigment is characterized by being prepared from the following raw materials in parts by weight: 40-45 parts of sliced aluminum powder, 100-110 parts of isopropanol, 0.3-0.35 part of copper sulfate crystals, an appropriate amount of deionized water, 4-4.5 parts of phenol ether phosphate, an appropriate amount of anhydrous ethanol, 9-10 parts of tetraethyl orthosilicate, 6-7 parts of vinyl triethoxysilane, 9-10 parts of an ammonia solution of which the concentration is 20wt%, 200-220 parts of n-butyl acetate, 5-6 parts of acyclic acid, 5-6 parts of methacrylic acid, 0.6-0.65 part of benzoyl peroxide, 13-15 parts of propylene glycol monomethyl ether, 2-3 parts of animal oleic acid, 3-4 parts of carbon fibers, 4-5 parts of 200-mesh spherical permalloy powder, 1.5-2 parts of stearic acid and 1-1.2 parts of polyvinyl alcohol. According to the corrosion-resistant aqueous aluminum pigment disclosed by the invention, the carbon fibers and the permalloy powder are added during preparation of products, so that the magnetic conduction rate of materials is reduced, the corrosion-resistant aqueous aluminum pigment can be added during preparation of shielding materials, and coating films are even.

The invention discloses an aluminium pigment with high dispersion, corrosion inhibition, dual coating and water resistance. The pigment is characterized in that the pigment is prepared by the following raw materials in parts by weight: 40-45 parts of sheet shaped aluminium powder, 100-110 parts of isopropanol, 0.3-0.35 parts of copper sulphate crystal, a proper amount of deionized water, 4-4.5 parts of phenolic ether phosphate ester, a proper amount of absolute ethanol, 9-10 parts of ethyl orthosilicate, 6-7 parts of triethoxyvinylsilane, 9-10 parts of ammonia water whose concentration is 20wt%, 200-220 parts of butyl acetate, 5-6 parts of acrylic acid, 5-6 parts of methacrylic acid, 0.6-0.65 parts of dibenzoyl peroxide, 13-15 parts of 1-methoxy-2-propanol, 1.5-2 parts of polyether polyester modified organosiloxane, 0.9-1.2 parts of guar gum, 0.4-0.6 parts of soya bean lecithin, 0.8-1 part of propyl gallate, 4-5 parts of mica powder, and 2-3 parts of titanium dioxide. The product is completely coated, and has good water resistance; the product can be uniformly dispersed in an aqueous system.

The invention is applicable to the related field of chemical agent production, and provides a sampling device for chemical agent analysis, which comprises a sampling assembly for digging and containing a chemical agent; a sealing assembly used for storing the chemical agent in the sampling assembly in a sealing manner; a storage assembly is used for storing the sealing assembly and the sampling assembly; and an operation assembly used for moving the sampling assembly out of the storage assembly. After the sampling assembly completes sampling of chemical agents, the sealing assembly seals the sampling assembly, so that the chemical agents in the sampling assembly are isolated from a large amount of air, in addition, the containing assembly limits and buckles the sealing assembly and the sampling assembly, and the sealing assembly and the sampling assembly are prevented from being opened in the transferring process; and the problem that the chemical agent may volatilize or the chemical agent contacts and reacts with substances in the air for a long time in the long-distance transfer process is effectively avoided.

The invention discloses a high-brightness and high-stability of corrosion-resistant water-based aluminum pigment, which is prepared from the following raw materials in parts by weight: 40 to 45 parts of flaky aluminum powder, 100 to 110 parts of isopropyl alcohol, 0.3 to 0.35 parts of copper sulfate crystal, an appropriate amount of deionized water, 4 to 4.5 parts of phenolic ether phosphate, an appropriate amount of absolute ethanol, 9 to 10 parts of ethyl orthosilicate, 6 to 7 parts of vinyl triethoxysilane, 9 to 10 parts of ammonia with concentration of 20wt%, 200 to 220 parts of butyl acetate, 5 to 6 parts of acrylic acid, 5 to 6 parts of methacrylic acid, 0.6 to 0.65 part of dibenzoyl peroxide, 13 to 15 parts of propylene glycol monomethyl ether, 1.2 to 1.5 parts of polyvinyl alcohol, 0.3 to 0.4 part of sodium polyacrylate, 6 to 7 parts of nano antimony tin oxide, 1.2 to1.4 parts of dimethyl silicone oil, and 0.8 to 1 part of polydimethylsiloxane. The product prepared by the invention is not corroded in an aqueous system and has strong stability.

The invention discloses a non-wettability coating suitable for resisting high-temperature aluminum permeation and a preparation method of the non-wettability coating. The non-wettability coating suitable for resisting high-temperature aluminum permeation is composed of an alloy matrix, a bonding layer and a surface ceramic layer in sequence. Wherein the thickness range of the bonding layer is 50-100 microns; the thickness of the surface ceramic layer ranges from 100 micrometers to 500 micrometers. According to the coating and the preparation method of the coating, a non-infiltrating coating material resistant to high-temperature aluminum permeation is obtained, so that parts such as a tank wall and a steel shell aluminum core anode claw are prevented from being in contact reaction with an aluminum solution in the aluminum electrolysis process, the service life of related equipment is prolonged, the production cost is saved, and the production efficiency is improved.