Gypsum water reducing agent with small over-time fluidity loss as well as preparation method and application of gypsum water reducing agent

• Main Authors: ZHAO HUI, PAN ZHIFENG, QIU YUETAO, ZHANG XIAOFANG, QIU HAILI, CHEN WENSHAN
• Format: Patent
• Language: Chinese; English
• Published: 05.01.2024
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; REFRACTORIES; SLAG; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF NATURAL STONE

The invention belongs to building material admixtures, and particularly relates to a gypsum water reducer as well as a preparation method and application thereof. The preparation method of the gypsum water reducer comprises the following steps: carrying out a free radical polymerization reaction on an ethylene glycol monovinyl polyoxyethylene ether macromonomer, 4, 4, 4-trifluorobutenoic acid and an esterified macromonomer in the presence of a chain transfer agent, the esterified macromonomer is an esterification reaction product of methoxy polyethylene glycol and 1-butylene-2, 3, 4-tricarboxylic acid, and the chain transfer agent is an organic solvent. The obtained free radical polymerization reaction product is the gypsum water reducing agent. The gypsum water reducer obtained by the method provided by the invention is small in fluidity time loss, and has great industrial application prospects. 本发明属于建筑材料外加剂，具体涉及一种石膏减水剂及其制备方法和应用。所述石膏减水剂的制备方法包括将乙二醇单乙烯基聚氧乙烯醚大单体、4,4,4-三氟丁烯酸和酯化大单体在链转移剂的存在下进行自由基聚合反应，所述酯化大单体为甲氧基聚乙