46results about How to "High water reduction efficiency" patented technology

The invention discloses a slow release type efficient polycarboxylic acid water reducer and a preparation method thereof. The slow release type efficient polycarboxylic acid water reducer is composed of the following materials: acrylic acid, maleic anhydride, polyoxyethylene ether macromonomer, a macromolecule template agent, sodium hydroxide, deionized water, a peroxide initiator and a chain transfer agent. The preparation method comprises the following steps: adding sodium hydroxide and deionized water into a stirring kettle to prepare a sodium hydroxide solution; dropping acrylic acid into the sodium hydroxide solution by using a peristaltic pump to obtain a reaction liquid A; adding the peroxide initiator and deionized water into a material barrel to obtain a dissolving solution B; adding the chain transfer agent and deionized water into a material barrel to obtain a dissolving solution C; adding the polyoxyethylene ether macromonomer, maleic anhydride and the macromolecule template agent into a reaction kettle, and sucking out deionized water to obtain a reaction liquid D; adding the reaction liquid A, the dissolving liquid B and the dissolving liquid C into the reaction liquid D by using a peristaltic pump to obtain the slow release type efficient polycarboxylic acid water reducer. The water reducer provided by the invention has slow release property, relatively high water reducing efficiency, and good water reducing performance and slump loss resistant property.

The invention discloses a preparation process for an aliphatic concrete water reducing agent. Ketone and aldehyde compounds are used as condensation monomers, crystallized sulphite and pyrosulfite areused as sulfonating agents, and the aliphatic concrete water reducing agent is chemically synthesized in water solution. Waste crystallized sodium sulfite is adopted to replace partial sodium sulfiteto produce the aliphatic water reducing agent, so the cost is greatly reduced; and products produced by the preparation process have short cycle, low energy consumption, less input equipment and reduction of environmental pollution.

The invention discloses a modified chitosan efficient retarding and water-reducing agent and a preparation method and a using method thereof. Chitosan and itaconic anhydride react to prepare double-bond modified chitosan; the modified chitosan, acrylic monomer and sodium allysulfonate are subjected to copolymerization reaction; the product of polymerization reaction is compounded with a retarder to obtain the modified chitosan efficient retarding and water-reducing agent. The modified chitosan efficient retarding and water-reducing agent prepared by the preparation method provided by the invention has the characteristics of high water-reducing efficiency, high adaptability, long retarding time, capability of being used together with a polycarboxylate-type water-reducing agent, and the like.

The present invention relates to the production process of water reducer for cement and concrete, and belongs to the field of building material technology. The water reducer consists of calcium lignosulfonate, p-aminobenzenesulfonic acid, phenol, alkali and formaldehyde, and is produced into water preparation via adding water in 1-3 times. The production process includes heating water to 85-100 deg.c, adding the said materials successively via stirring, cooling to room to form water preparation, or further drying to form powder preparation. The present invention has the advantages of low temperature and normal pressure production, easy control of technological process, no environmental pollution, high function of controlling flowability loss of cement slurry and concrete and no harm to concrete durability.

The invention relates to a preparation method of a polycarboxylate water reducer, belonging to the technical field of building materials and cement concrete admixtures. The polycarboxylate water-reducer of the present invention uses methallyl polyethylene glycol and acrylamide as reaction monomers, uses sodium dodecylsulfonate as surface adsorption active agent, and adds chain transfer agent and initiator agent, and finally adjust the pH to 6-7 with lye to prepare the water reducer. The polycarboxylate superplasticizer of the present invention has high yield and good performance, and the added sodium dodecylsulfonate can promote the saturation rate of the adsorption charge of concrete surface particles, increase the flowability of cement in concrete mixing, and reduce the mixing time , improve efficiency, and play a better anti-adhesion effect. The polycarboxylate water-reducer of the invention has simple preparation process, low cost, high water-reducing efficiency, good compatibility with cement and concrete, and can effectively improve the fluidity, slump, super strength and durability of concrete.

The invention discloses a preparation method of an inorganic fireproof door core material, and belongs to the technical field of fireproof materials. The preparation method of the inorganic fireproof door core material is characterized by comprising the following steps that 1, cement slurry is prepared, wherein 1 part of sulfate aluminum cement, 0.002-0.01 part of water reducing agent, 0.002-0.01 part of basalt fiber and 0.3-0.4 part of water are mixed to be uniform for use; 2, a foam body is prepared, wherein a foaming agent is diluted, and the foam body is prepared; 3, the foam prepared in the second step and the cement slurry prepared in the first step are mixed according to the proportion of 2-6 mL / g, stirring is conducted to be uniform, the obtained mixture is poured into a mold, standard curing is conducted for 24 h, demolding is conducted, and then natural curing or standard curing is conducted for 7-28 days, and the inorganic fireproof door core material is obtained. When the inorganic fireproof door core material is subjected to a flame, dripping matter does not exist on the surface, the phenomena of curling and melting do not exist, and the inorganic fireproof door core material has the advantages of being good in use property and fireproof property and environmentally friendly.

The invention discloses a concrete water reducing agent prepared from waste leather slag. The concrete water reducing agent is prepared from the following materials in parts by mass: 100-120 parts of clean waste leather slag, 200-240 parts of water, 0.5-1 part of a permeating agent JFC, 1-1.2 parts of 2709-alkaline protease, 30-40 parts of formaldehyde with the mass percentage of 36%, 2-5 parts of a sodium hydroxide solution with the mass percentage of 40%, 4-6 parts of sodium tripolyphosphate, a modifier and a sulfonation reagent. The invention further discloses a preparation method of the concrete water reducing agent prepared from the waste leather slag; the concrete water reducing agent prepared by the preparation method is high in water reducing efficiency; the preparation technology is unique, and the usability is high; a new way is supplied to recycling the waste leather slag produced by a leather enterprise, and a new raw material is provided for preparation of the water reducing agent.

The present invention discloses a renewable plant cellulose water reducing agent for cements, and the water reducing agent consists of the following components: plant cellulose, high-concentration alkali, oxidizing agents and a solvent; wherein the weight ratio of the plant cellulose, the solvent and the high-concentration alkali is 1:10-15:1.5-3; the weight ratio of the plant cellulose, the solvent and the oxidizing agents is 1:0.8-1.2:0.8-1.2; and the weight ratio of the plant cellulose and a solid alkali is 0.8: 1.2. The invention also discloses a preparation method for the renewable plant cellulose water reducing agent for cements. The water reducing agent provided by the invention is high in water absorption efficiency, and low-carbon and environmentally friendly in components and the preparation process.

The invention discloses a slow-setting composite water reducer for refractory castables containing silica fume, which is made of activated alumina micropowder, sodium hexametaphosphate, melamine water reducer, anhydrous citric acid and L-tartaric acid as raw materials The mass ratio of activated alumina micropowder, sodium hexametaphosphate, melamine superplasticizer, anhydrous citric acid and L-tartaric acid is 50:10~15:20~30:3~6:4~7. The present invention fully considers the dispersion of sodium hexametaphosphate to α-alumina micropowder and the dispersion of melamine and anhydrous citric acid to silica micropowder, and simultaneously utilizes the water-reducing and retarding effects of L-tartaric acid and anhydrous citric acid. The composite water reducing compound of the present invention has the characteristics of high water reducing efficiency, strong applicability, and excellent high-temperature retarding performance, and can solve technical problems such as too fast condensation and short construction time of castables in field construction under high temperature conditions.

The invention belongs to the technical field of concrete admixtures, and particularly relates to a high-efficiency water reducing agent for high-strength concrete. The high-efficiency water reducing agent is prepared from, by weight, 3-6 parts of polyglyceryl-10 myristate, 5-8 parts of sodium tripolyphosphate, 2-5 parts of sodium polyacrylate, 4-9 parts of sodium dodecylbenzene sulfonate, 10-12 parts of hydrolyzed polymaleic anhydride (HPMA), 3-7 parts of zinc salt, 5-12 parts of maltodextrin, 5-10 parts of N,N'-dinitrosopentamethylenetetramine, 5-10 parts of azodicarbonamide, 3-4 parts of N,N-dimethylcyclohexylamine, 6-8 parts of polyacrylamide (PAM), 15-20 parts of hydroxyethyl cellulose, 8-16 parts of sodium carboxymethylcellulose, 13-20 parts of a naphthalenesulfonate formaldehyde condensate and 3-6 parts of an auxiliary agent. The water reducing agent has various types of hydrophilic groups, high water-reducing efficiency and good fluidity, can obviously improve the fluidity of the concrete, has a remarkable early strengthening effect after final setting, and can significantly improve the strength of the concrete at various ages.

The invention discloses an efficient concrete water-reducing agent and a preparation method thereof, and belongs to the technical field of concrete additives. Acrylic acid is used as a raw material, and polyethylene glycol monomethyl ether is added. Through an esterification reaction, a macromonomer is obtained; and citric acid is added for modification to reduce formation of calcium silicate hydrated gel so as to obtain higher water-reducing rate. L-aspartic acid is used as a raw material, and carboxyl anions are formed. Then, the water-reducing agent still can be greatly dispersed under thecondition of hard water to play a water-reducing effect. By introducing triethanolamine, solubility of concrete particle surface is raised, and water-reducing efficiency is enhanced. Problems of existing water-reducing agents, such as poor hard water resistance and low water-reducing efficiency are solved.