104results about How to "Good anti-mud effect" patented technology

The invention discloses a mud-proof slump-retaining type polycarboxylate superplasticizer with low shrinkage and high adaptability and a low-temperature preparation method thereof. The polycarboxylatesuperplasticizer is mainly prepared by the following steps: carrying out free radical polymerization on 4-hydroxybutylvinyl polyoxyethylene ether, unsaturated carboxylic acid, an unsaturated amide-type monomer, dipolyethylene glycol maleate, an unsaturated quaternary ammonium cationic monomer, an oxidizing agent, a catalyst, a reducing agent, a chain transfer agent and deionized water at 5-15 DEGC through an aqueous solution, regulating pH value by adding a sodium hydroxide solution, and supplementing water. The preparation method of the invention has advantages of low-temperature production, no heat source, simple equipment, no pollution, short reaction time and high production efficiency. The prepared mud-proof slump-retaining type polycarboxylate superplasticizer endows concrete withgood workability, good adaptability, low shrinkage and high strength, has excellent mud-proof slump-retaining property, and greatly reduces construction difficulty.

The invention discloses a star-like amphoteric polycarboxylate superplasticizer with efficient anti-mudding function and a preparation method thereof; the preparation method comprises: esterifying Beta-cyclodextrin and a dithioester compound with acyl halide groups to obtain star-structure reversible addition-fragmentation chain transfer agent (RAFT agent), initiating RAFT polymerization of (methyl)polyethylene glycol diacrylate, (methyl)acrylic acid and (methyl)acryloyloxyethyl trimethyl ammonium chloride under the action of the chain transfer agent and an initiator to obtain star-like amphoteric copolymer, and carrying out further processing to obtain the star-like amphoteric polycarboxylate superplasticizer having a solid content of 20% and efficient anti-mudding function. The polycarboxylate superplasticizer prepared herein has high water-reducing rate and efficient ant-mudding function and may meet high construction requirements.

The invention discloses a polycarboxylate superplasticizer containing phosphate groups. The polycarboxylate superplasticizer is prepared from, by weight, 70-80 parts of unsaturated polyether monomer, 0.3-1.0 part of hydrogen peroxide, 2-10 parts of carboxylic acid, 0-18 parts of carboxylic ester, 0.5-1.5 parts of chain transfer agent, 9-28 parts of deionized water X for feed liquid A preparation, 0.1-0.2 part of reductant, 18-26 parts of deionized water Y for feed liquid B preparation and 45-80 parts of deionized water Z for dissolving large unsaturated polyether monomers. Due to the fact that the phosphate groups are introduced to molecular chains, the polycarboxylate superplasticizer containing the phosphate groups is high in water reducing rate and good in slump retaining performance and has very good sulfate and mud resistance capability. A preparation method is simple, the polycarboxylate superplasticizer is synthesized under normal temperature, the energy consumption is low, inorganic phosphate serves as the chain transfer agent, the price is low, the material cost is low, higher-price chain transfer agents in a traditional process can be replaced, and industrial production is easy.

The invention discloses an anti-mud polycarboxylic acid slump retaining agent. The slump retaining agent is prepared from the following raw materials by weight percent: 50-75% of unsaturated polyoxyethylene ether monomer, 4-8% of acrylic acid, 6-12% of maleic anhydride, 11-20% of hydroxyethyl acrylate or hydroxypropyl acrylate, 0.5-3.0% of chain transfer agents, 0.1-5% of initiators and 0.01-2% of initiating additives. The invention also discloses a preparation method of the slump retaining agent. The preparation method comprises the following steps: dropwise adding a solution of acrylic acid, hydroxyethyl acrylate and hydroxypropyl acrylate and dropwise adding the initiating additives for 2-3.5 hours, and adding a sodium hydroxide solution to regulate the pH value to 6-7 after insulating for 1-1.5 hours, thus obtaining the anti-mud polycarboxylic acid slump retaining agent with solid content of 40-45%. The slump retaining agent has an obvious anti-mud effect in concrete and has an excellent slump retaining capacity.

The invention discloses a polycarboxylate superplasticizer with super high early strength and a preparation method of the polycarboxylate superplasticizer. A molecular structure of the polycarboxylate superplasticizer with super high early strength contains cationic charges, a hydration reaction of cement is promoted, strength development of hardened concrete is accelerated, and the super high early strength function is realized; the polycarboxylate superplasticizer has specific cement particle dispersion capability by the aid of specific amphiphilic structure and steric hindrance effect, the water-reducing rate is high, and the soil resistance is good.

The invention discloses an anti-clay polymer dispersing agent and a preparation method thereof. The anti-clay polymer dispersing agent is prepared from monomers A, B and E through polymerization, wherein the monomer A is an aromatic compound with carboxy or phosphate groups, the monomer B is aldehyde, and the monomer E is an aromatic compound with sulfonate groups or hydroxyl. The anti-clay polymer dispersing agent has excellent mud resistance.

The invention discloses an anti-mud type low-slump-loss polycarboxylic acid water reducing agent and a preparation method thereof, and relates to the technical field of synthesis of concrete admixtures. Specifically, from the effect of a molecular structure and an initial pH value of a reaction system on the performance of a product, during a synthesis process, tartaric acid is selected as an adjusting catalyst of the initial pH value of the reaction system in a kettle, monomers succinic acid monoethyl propionyl oxyethyl ester and 2-allyloxy sodium ethanesulfonate having a special water reducing function, monomers cis-1-propylene phosphonic acid and 2-allyloxy sodium ethanesulfonate having a special anti-mud function, and monomers methoxyethyl acrylate, succinic acid monoethyl propionyl oxyethyl ester and isopentenol polyoxyethylene ether with the molecular weight M of 1400 having a special slump retaining function are introduced; after the reaction is finished, an organic alkali diethanolisopropanolamine is used for neutralizing, and the anti-mud type low-slump-loss polycarboxylic acid water reducing agent is synthesized. The reducing agent has the advantages of low alkali content, fast early strength achieving of concrete, and high strength, can significantly improve the workability and the slump retention of the concrete prepared by high-mud-content aggregates, has relatively good anti-mud ability, and also has the advantages of low gradual loss of newly blended concrete, high strength of hardened concrete, good durability and the like.

The invention discloses a preparation method of a highly mud resistant water reducing agent with graft copolymerization of a cation side chain for concrete, belonging to the field of water reducing agents. The highly mud resistant water reducing agent material with graft copolymerization of a cation side chain for concrete is synthesized by a method of carrying out cation side chain polymerization reesterification first and then graft copolymerization, i.e. an unsaturated cation quaternary ammonium salt monomer as a reactant carries out free radical polymerization in an oxidation-reduction initiation system composed of high-valence cerium salt and alcohols to obtain a terminal hydroxyl cation side chain, then unsaturated carboxylic acid, the terminal hydroxyl cation side chain and methoxy polyethylene glycol carry out esterification under the effect of a catalyst to produce two macromonomers, and then an unsaturated carboxylic acid monomer, a cation side chain macromonomer and a polyether side chain macromonomer as reactants carry out free radical graft copolymerization under the effects of an initiator and a chain transfer agent to obtain the highly mud resistant water reducing agent with graft copolymerization of the cation side chain for concrete. The process of the preparation method has the advantages of simple steps, high efficiency, immediacy, convenience in regulation and control, energy saving and environment protection, a composite side chain structure is synthesized creatively, and the effects of water reducing, slump loss resistance and inhibition in clay side effects are realized.

The invention discloses an anti-mud water reducer and a preparation method thereof, the anti-mud water reducer is prepared from the following raw material components in parts by mass: 30-50 parts of TPEG, 1-5 parts of acrylic acid, 5-10 parts of sodium methallyl sulfonate, 2-8 parts of a monoalkenyl cyclodextrin monomer, 1-5 parts of polyethylene glycol-4000, 1-5 parts of cellulose ether, a properamount of a sodium hydroxide water solution and a proper amount of deionized water. The water reducer is good in anti-mud adaptability, low in doping amount, high in water reducing effect and stablein quality.