Abstract: A microcapsule type polycarboxylate superplasticizer and a preparation method thereof. The microcapsule type polycarboxylate superplasticizer is a polycarboxylic acid aqueous solution encapsulated by a closed capsule, and the closed capsule is an organic/inorganic composite shell layer of calcium ion gel of sodium alginate or gelatin, and calcium carbonate. The organic/inorganic composite shell layer is obtained through diffusion-interface reaction of sodium alginate or gelatin, calcium salt and urea under the catalysis of urease. The microcapsule type polycarboxylate superplasticizer meets requirement of long-term and stable slump retaining of concrete in some special engineering. The preparation method has simple processes, free of organic solvent, and has high encapsulating efficiency.

Abstract: Providing a multi-functional group superplasticizer for an ultra-high performance concrete and a method for preparing the same. Its backbone is an alkyl chain, and its side chain are some side chains with carboxylic acid or carboxylate at terminals, some polyether side chains, and some polyol amine side chains substituted with phosphoric acid or phosphite at terminals, the polyol amine side chains substituted with phosphoric acid or phosphite at terminals is connected to the backbone through a phenyl or an alkyl group of 1-9 carbons, and a ratio of a number of the side chains with carboxylic acid or carboxylate at terminals to a total number of side chains is ?0 and ?0.8; and a ratio of a number of the polyether side chains to the total number of side chains is ?0.1 and ?0.9.

Abstract: The present application discloses a polyhydroxy aromatic intermediate, preparation thereof and use thereof in a polycondensate water-reducer with branched side chains. The polycondensate water-reducer with branched side chains has a branched side chain structure which provides a stronger steric hindrance. The synergistic effect of the branched side chains and the rigid skeleton of the aromatic ring greatly improves the water-reducing ability. Especially under a condition of low water/cement ratio, the improvement in water-reducing ability is more obvious. The branched polyether side chain is more conducive to the formation of a thicker water film layer, which has an obvious viscosity reduction effect. The conformation of the branched polyether side chain is less affected by different ionic environments in the pore solution in cement, and thus has a stronger adaptability to various raw materials.

Abstract: Disclosed is a preparation method of a polycarboxylate water reducer having a regular sequence structure. The preparation method of the present invention comprises: performing Michael addition on polyethylene glycol ether acrylate macromonomer A and amino-containing carboxylic acid B for 5-12 hours, then cooling to 0° C., dropwise adding acryloyl chloride slowly and evenly, and further reacting for 12 hours at room temperature to obtain carboxyl-containing polyether macromonomer C; mixing the carboxyl-containing polyether macromonomer C, a small molecular RAFT reagent, an initiator, and water adequately; and holding the polymerization mass concentration at 30%-60% and heating to 60-80° C. in the atmosphere of N2 to react for 2-5 hours to obtain the polycarboxylate water reducer having a regular sequence structure.

Abstract: Disclosed are a highly adaptable viscosity-reducing polycarboxylate water reducer and its preparation method and application. The highly adaptable viscosity-reducing polycarboxylate water reducer is composed of a polymer and water, and the polymer accounts for 30-50 wt %; since the main chain of the polymer contains a hydrophobic benzene ring and hydrophilic amine, the polymer has strong rigidity and good solubility in an aqueous solution, and is rich in two adsorption groups of carboxyl group/phosphono group. The highly adaptable viscosity-reducing polycarboxylate water reducer of the present invention has excellent water-reducing and slump retention properties and is suitable for general construction projects and commercial concrete projects.

Abstract: Disclosed is a preparation method of a polycarboxylate water reducer having a regular sequence structure. The preparation method of the present invention comprises: performing Michael addition on polyethylene glycol ether acrylate macromonomer A and amino-containing carboxylic acid B for 5-12 hours, then cooling to 0° C., dropwise adding acryloyl chloride slowly and evenly, and further reacting for 12 hours at room temperature to obtain carboxyl-containing polyether macromonomer C; mixing the carboxyl-containing polyether macromonomer C, a small molecular RAFT reagent, an initiator, and water adequately; and holding the polymerization mass concentration at 30%-60% and heating to 60-80° C. in the atmosphere of N2 to react for 2-5 hours to obtain the polycarboxylate water reducer having a regular sequence structure.

Abstract: A slump retaining polycarboxylic acid superplasticizer. A weight average molecular weight of the superplasticizer is 20,000-80,000. The slump retaining polycarboxylic acid superplasticizer is prepared by performing polymerization reaction on a monomer A, a monomer B, a monomer C and a monomer D in an aqueous solution in the presence of a redox initiator, wherein a molar ratio of (the monomer A+the monomer B):the monomer C:the monomer D is 1:(3-8):(4-12), and a molar ratio of the monomer A to the monomer B is 1:(1-4).

Abstract: The present invention provides a preparation method of hyperbranched polycarboxylic acid type copolymer cement dispersant, including: Monomer A, B and C undergo a free radical copolymerization in an aqueous medium. The molar ratio of Monomer A, Monomer B and Monomer C conforms to B/A?A?2?10 and C/(A+B?C)?0.02?0.08. Monomer A is expressed by General Formula (1), where, R1 is H or a methyl; X1?O, CH2O, CH2CH2O; m is an integer from 5 to 200. Monomer B is expressed by General Formula (2), where, R2 is H or COOM; R3 is H or CH3 and M is H, Na, K or NH4; Monomer C is expressed by General Formula (3), where, R4 is H or methyl; X2?O, CH2O, CH2CH2O; Y?CH2, CH2CH2, CH(CH3), CH2CH2CH2, CH(CH3)CH2, C(CH3)2 and n is an integer from 5 to 200.

Abstract: A slump retaining polycarboxylic acid superplasticizer. A weight average molecular weight of the superplasticizer is 20,000-80,000. The slump retaining polycarboxylic acid superplasticizer is prepared by performing polymerization reaction on a monomer A, a monomer B, a monomer C and a monomer D in an aqueous solution in the presence of a redox initiator, wherein a molar ratio of (the monomer A+the monomer B):the monomer C:the monomer D is 1:(3-8):(4-12), and a molar ratio of the monomer A to the monomer B is 1:(1-4).

Abstract: A water-dispersible amphoteric polyurethane and a preparation method therefor. The water-dispersible amphoteric polyurethane is prepared from a polyisocyanate compound, a polyol compound, a dial compound having an anionic group or a potential anionic group, a compound having a tertiary or quaternary amine cationic group at least having two active H functional groups and a polyamine compound having a polyoxyethylene group. During preparation, the feeding order of the dial compound and the compound having a tertiary or low-molecular quaternary amine cationic group is controlled, and then neutralization and chain extension are performed, to obtain the target product. Also disclosed is a use of the water-dispersible amphoteric polyurethane in reinforcing concrete, wherein the water-dispersible amphoteric polyurethane is present in an amount of 0.1% to 5%, based on the total weight of the concrete.

Abstract: The present invention provides a preparation method of hyperbranched polycarboxylic acid type copolymer cement dispersant, including: Monomer A, B and C undergo a free radical copolymerization in an aqueous medium. The molar ratio of Monomer A, Monomer B and Monomer C conforms to B/A-A-2-10 and C/(A+B-C)-0.02-0.08. Monomer A is expressed by General Formula (1), where, R1 is H or a methyl; X1?O, CH2O, CH2CH2O; m is an integer from 5 to 200.