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.

Use of a comb polymer as an inerting agent for non-swelling layer-silicates, the comb polymer including: a) at least one poly(alkylene oxide) side chain-bearing monomer unit M1 without ionic groups, b) optionally at least one cationic monomer unit MC, wherein the molar ratio of the cationic monomer units MC to the side chain-bearing monomer units M1 is equal to or less than 0.1, preferably less than 0.05, c) optionally at least one anionic monomer unit MA, wherein the molar ratio of the anionic monomer units MA to the side chain-bearing monomer units M1 is less than 1, preferably equal to or less than 0.5, and c) optionally at least one non-ionic monomer unit M3, wherein the molar ratio of the non-ionic monomer units M3 to the side chain-bearing monomer units M1 is less than 7, preferably equal to or less than 3.

The present disclosure is related to a hydrophilic monomer, comprising (i) at least one amino moiety; (ii) at least one polyoxyalkylene unit; and (iii) at least one (meth)acrylate moiety.

The present disclosure is related to a hydrophilic monomer, comprising (i) at least one amino moiety; (ii) at least one polyoxyalkylene unit; and (iii) at least one (meth)acrylate moiety.

A novel graft polymer can include a block copolymer backbone (A) as a graft base having polymeric sidechains (B) grafted thereon. The polymeric sidechains (B) are obtainable by polymerization of at least one vinyl ester monomer (B1) and optionally N-vinylpyrrolidone as optional further monomer (B2). For example, the block copolymer backbone (A) is a triblock copolymer of polyethylene oxide (PEG) and polypropylene oxide (PPG). Also included is a process for obtaining such a graft polymer, the process is preferably carried out by free-radical polymerization.

A novel graft polymer can include a block copolymer backbone (A) as a graft base having polymeric sidechains (B) grafted thereon. The polymeric sidechains (B) are obtainable by polymerization of at least one vinyl ester monomer (B1) and optionally N-vinylpyrrolidone as optional further monomer (B2). For example, the block copolymer backbone (A) is a triblock copolymer of polyethylene oxide (PEG) and polypropylene oxide (PPG). Also included is a process for obtaining such a graft polymer, the process is preferably carried out by free-radical polymerization.

The present invention discloses a multi-arm polycarboxylate water reducer and a preparation method thereof, the preparation method includes the following steps: making a phenolic hydroxyl containing rigid compound and p-nitrobenzonitrile subjected to a nucleophilic substitution reaction in a solvent, then subjected to addition with a sodium azide in a solvent and water mixed solution to obtain a tetrazole derivative; making an unsaturated polyether macromonomer subjected to terminal halogenation and react with the prepared tetrazole derivative to obtain a tetrazole-containing multi-arm unsaturated polyether macromonomer; and subjecting the tetrazole-containing multi-arm unsaturated polyether macromonomer, an unsaturated carboxylic acid small monomer and an unsaturated polyether macromonomer to a free radical polymerization reaction under combined action of an initiator, a reducing agent and a molecular weight regulator to obtain the multi-arm polycarboxylate water reducer integrating shrinkage reducing and antibacterial functions.

A modified vinyl alcohol-based polymer includes a polyoxyalkylene unit, and an organic acid unit bonded to a polyvinyl alcohol chain, the polyoxyalkylene unit includes a moiety represented by the general formula (I), the moiety being bonded to the polyvinyl alcohol chain only via an ether bond and/or a carbon-carbon bond, wherein a ratio of a number of moles of monomer units bonded to the polyoxyalkylene unit to a total number of moles of the monomer units constituting the polyvinyl alcohol chain of the modified vinyl alcohol-based polymer is 0.01 mol % to 5 mol %, and a ratio of a number of moles of the organic acid unit to the total number of moles of the monomer units constituting the polyvinyl alcohol chain of the modified vinyl alcohol-based polymer is 0.1 mol % to 10 mol %.

A modified vinyl alcohol-based polymer includes a polyoxyalkylene unit, and an organic acid unit bonded to a polyvinyl alcohol chain, the polyoxyalkylene unit includes a moiety represented by the general formula (I), the moiety being bonded to the polyvinyl alcohol chain only via an ether bond and/or a carbon-carbon bond, wherein a ratio of a number of moles of monomer units bonded to the polyoxyalkylene unit to a total number of moles of the monomer units constituting the polyvinyl alcohol chain of the modified vinyl alcohol-based polymer is 0.01 mol % to 5 mol %, and a ratio of a number of moles of the organic acid unit to the total number of moles of the monomer units constituting the polyvinyl alcohol chain of the modified vinyl alcohol-based polymer is 0.1 mol % to 10 mol %.

Provided is a thermoplastic polyether ester elastomer composition having a first chain represented by the following Formula (I) and a second chain represented by the following Formula (II), which are connected to each other:

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Wherein, the melting point of the thermoplastic polyether ester elastomer composition ranges from 80° C. to 160° C., and the enthalpy of fusion of the thermoplastic polyether ester elastomer composition is greater than 6 J/g. Production of the thermoplastic polyether ester elastomer composition has low energy consumption and facilitates smooth cutting strands into pellets, which is beneficial to mass production of the thermoplastic polyether ester elastomer composition.