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

The invention discloses a synthetic method of an allyl polyglycol ether polycarboxylic acid water reducer. According to the method, allyl ether polyethylene glycol macromers, maleic anhydride (MA), acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and the like are used as main raw materials, a water-soluble hydroperoxide is used as an initiator, a transition metal salt is used as a catalyst, and polymerization is initiated in a specific pH range (2.5-6.0). The method makes the content of maleic acid in a polymer be greatly improved, the water reduction effect be good, and the product cost be greatly reduced and the product applicability be extensive especially replacing parts of acrylic acid by maleic acid, so the method is convenient for industrialized production and popularization.

The invention relates to the technical field of concrete additives, and more specifically relates to application of a hydroxyl terminated hyperbranched polyester hyperbranched retarder in adjustment of retardation time of concrete. A new hyperbranched retarder is synthesized by synthesizing a carboxyl terminated hyperbranched polymer first, then performing end capping on the carboxyl terminated hyperbranched polymer, and synthesizing the hydroxyl terminated polymer into a main chain. When used in the field of concrete additives, the hyperbranched retarder can well improve the mobility of concrete and prolong the retardation time, and the hyperbranched retarder has a simple and convenient synthesis process, is easy to industrialize and has superior performance.

The invention relates to a preparation method of a polycarboxylate superplasticizer, belonging to the technical fields of building materials and cement concrete admixtures. The polycarboxylate superplasticizer is prepared by taking methylallyl polyethylene glycol and acrylamide as reaction monomers and sodium dodecyl sulfonate as a surface absorption activator, adding a chain transfer agent and an initiator, and finally, regulating the PH value to 6-7 by using an alkaline solution. The polycarboxylate superplasticizer is high in yield and good in performance; and due to the addition of sodium dodecyl sulfonate, the saturation rate of charges adsorbed by particles on a concrete surface can be increased, the flowability of cement in concrete stirring can be improved, the stirring time can be shortened, the efficiency can be increased, and an anti-adhesion effect is better taken. The polycarboxylate superplasticizer is simple in preparation process, low in cost, high in water reducing efficiency, good in cement and concrete compatibility and capable of effectively improving the flowability, slump constant, superstrength and durability of concrete.

The invention discloses a low slump loss modified naphthalene series water-reducing agent which is characterized in that: the water-reducing agent is formed by mixing 87-97 percent of naphthalene series water-reducing agents and 3-13 percent of oxidation-etherification starch by weight percentage; by adopting the invention, the water-reducing agent contains a great amount of hydroxyl, cement hydration can be prevented, so as to lead the cement hydration products to be uniform and improve the slump-blocking performance of the water-reducing agent; the water-reducing agent in the invention is applied to the cement, the reducing amount of the mobility is more than 6 percent after two hours, 28d intensity is improved by more than 12 percent, therefore, the invention not only can ensure the water-reducing effect and reduce the slump economic loss, but also can effectively improve the cement and concrete intensity.

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 invention relates to the field of concrete admixture and discloses a modified melamine water reducer and a preparation method thereof. An organic long chain is introduced to a molecular terminal position of the modified melamine water reducer, the mole ratio of a long-chain raw material to formaldehyde is 1:1 during synthesis of the organic long chain, and the mole ratio of melamine to formaldehyde to sodium hydrogen sulfite to a terminal-group long chain is 1: (3.5-3.8): (1.5-2.0): (0.03-0.05). The invention further discloses the preparation method of the modified melamine water reducer. The preparation method comprises steps as follows: synthesizing the terminal-group long chain; adding formaldehyde and sodium hydrogen sulfite for hydroxymethylation and sulfonation reactions of melamine; performing a condensation polymerization reaction under the acidic condition; adding alkali for reforming and weak bond fission of polymer molecules, and removing formaldehyde residues. A water reducer molecule main chain is introduced to a terminal position of the long chain through a condensation reaction of hydroxyl groups in a solution, space steric hindrance is added to a dispersion system, the repulsive interaction among cement particles is further improved, and the water reducing effect is further improved.

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.

The invention relates to a method for preparing a polyether polycarboxylic acid type high-efficiency water reducing agent from polyethylbenzene tower bottom high-boiling residues. The polyether polycarboxylic acid type high-efficiency water reducing agent is prepared by free radical polymerization of arone olefin, a double-bond-containing macromonomer and a micromolecular monomer, and the arone olefin is prepared by catalytic acylation of poly-ethylbenzene sulfonic acid and unsaturated acylate by using a bifunctional molecular sieve encapsulated catalyst. The bifunctional molecular sieve encapsulated catalyst is prepared by one-step hydrothermal reaction of sodium metaaluminate, sodium hydroxide, modified silicon dioxide, N,N,N-trimethyl-1-amantadine, carbon nanotubes and (2,2'-bipyridine) nickel diiodide. The polyethylbenzene sulfonic acid is prepared by sulfonating the high-boiling residues at the bottom of a polyethylbenzene tower. According to the method, the polyethylbenzene tower bottom high-boiling residues serve as raw materials, polyether polycarboxylic acid type high-efficiency water reducing agent molecules are prepared through the steps of sulfonation, acylation, free radical polymerization and the like, and the polyether polycarboxylic acid type high-efficiency water reducing agent is practically applied to the building field and has important significance in resourceful treatment of the ethylbenzene tower bottom high-boiling residues.

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 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 concrete with high shock and abrasion resistant capacity for hydropower engineering. The concrete is prepared from the following raw materials in parts by weight: 30-50 parts of yellow sand, 3-5 parts of blast furnace slag powder, 15-25 parts of fly ash, 5-10 parts of silica powder, 30-50 parts of cement, 10-15 parts of potassium feldspar powder, 10-15 parts of medium sand,2-4 parts of kaoline, 3-5 parts of anhydrite, 3-5 parts of fibers, 3-5 parts of high-strength steel-wire-like fibers, 2-4 parts of aluminum nitride, 1-3 parts of mullite, 0.4-0.6 part of hydroxyethylmethylacrylate, 0.1-0.3 part of zinc acetate, 2-4 parts of rubber powder, 3-5 parts of styrene, 2-4 parts of resorcinol, 0.1-0.3 part of lauryl sodium sulfate, 5-10 parts of a plasticizer, 4-6 partsof triethanolamine, 6-8 parts of a nano material, and 2-4 parts of a water reducer. The concrete has the excellent anti-shock and anti-abrasion properties, air shrinkage deformation of the concrete iseffectively lowered, and thus the anti-cracking capacity of the concrete for the hydropower engineering is improved.

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 provides a concrete additive which comprises the following components in parts by weight: 5-10 parts of polyurethane modified fly ash, 20-30 parts of indolyl sulfo diphenyl ketone polyphenyl ether, 10-15 parts of MPEG-2000-DSPE, 10-15 parts of pentaerythritol and 10-15 parts of deionized water. The invention also discloses a preparation method of the concrete additive. The preparation method of the concrete additive disclosed by the invention is simple and feasible, the raw materials are easy to obtain, the preparation cost is low, the dependence on equipment is small, and the method is suitable for large-scale production; the prepared concrete additive has various functions, is more obvious in improvement effect on the strength, fluidity, durability and impermeability of concrete, and has the advantages of being less in using amount and more excellent in comprehensive performance.