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Low-air-entraining type polycarboxylate superplasticizer suitable for bare concrete and one-step synthesis method of low-air-entraining type polycarboxylate superplasticizer
The invention discloses a low-air-entraining type polycarboxylic acid high-performance water reducing agent suitable for bare concrete and a one-step synthesis method of the water reducing agent, and belongs to the field of cement concrete water reducing agents. The preparation method comprises the following steps: carrying out one-step aqueous solution free radical copolymerization reaction on an unsaturated fluorine monomer, unsaturated polyoxyethylene ether or unsaturated polyester macromonomer, unsaturated carboxylic acid or unsaturated anhydride micromonomer, a chain transfer agent and an initiator, and regulating the pH value to 6-8 by using alkali liquor to prepare the low-air-entraining polycarboxylic acid high-performance water reducing agent suitable for bare concrete. The preparation process is simple, unsaturated fluorine monomers and other monomers are subjected to one-step copolymerization through a free radical polymerization method, the defoaming effect of fluorine atoms is utilized, so that the polycarboxylate superplasticizer has excellent dispersity and working performance and low air-entraining performance, and the polycarboxylate superplasticizer is suitable for bare concrete and industrial large-scale production.
本发明公开了一种清水混凝土适用的低引气型聚羧酸高性能减水剂及其一步合成方法，属于水泥混凝土减水剂领域。本发明将不饱和氟单体、不饱和聚氧乙烯醚或不饱和聚酯大单体、不饱和羧酸或不饱和酸酐小单体、链转移剂和引发剂进行一步法水溶液自由基共聚反应，用碱液调节pH值至6～8制得一种清水混凝土适用的低引气型聚羧酸高性能减水剂。本发明制备工艺简单，将不饱和氟单体通过自由基聚合法与其他单体实现一步共聚，利用氟原子的消泡作用，使聚羧酸减水剂具有优良的分散性及工作性能，并具有较低的引气性，适用于清水混凝土，适合工业化大规模生产。
Low-air-entraining type polycarboxylate superplasticizer suitable for bare concrete and one-step synthesis method of low-air-entraining type polycarboxylate superplasticizer
The invention discloses a low-air-entraining type polycarboxylic acid high-performance water reducing agent suitable for bare concrete and a one-step synthesis method of the water reducing agent, and belongs to the field of cement concrete water reducing agents. The preparation method comprises the following steps: carrying out one-step aqueous solution free radical copolymerization reaction on an unsaturated fluorine monomer, unsaturated polyoxyethylene ether or unsaturated polyester macromonomer, unsaturated carboxylic acid or unsaturated anhydride micromonomer, a chain transfer agent and an initiator, and regulating the pH value to 6-8 by using alkali liquor to prepare the low-air-entraining polycarboxylic acid high-performance water reducing agent suitable for bare concrete. The preparation process is simple, unsaturated fluorine monomers and other monomers are subjected to one-step copolymerization through a free radical polymerization method, the defoaming effect of fluorine atoms is utilized, so that the polycarboxylate superplasticizer has excellent dispersity and working performance and low air-entraining performance, and the polycarboxylate superplasticizer is suitable for bare concrete and industrial large-scale production.
本发明公开了一种清水混凝土适用的低引气型聚羧酸高性能减水剂及其一步合成方法，属于水泥混凝土减水剂领域。本发明将不饱和氟单体、不饱和聚氧乙烯醚或不饱和聚酯大单体、不饱和羧酸或不饱和酸酐小单体、链转移剂和引发剂进行一步法水溶液自由基共聚反应，用碱液调节pH值至6～8制得一种清水混凝土适用的低引气型聚羧酸高性能减水剂。本发明制备工艺简单，将不饱和氟单体通过自由基聚合法与其他单体实现一步共聚，利用氟原子的消泡作用，使聚羧酸减水剂具有优良的分散性及工作性能，并具有较低的引气性，适用于清水混凝土，适合工业化大规模生产。
Low-air-entraining type polycarboxylate superplasticizer suitable for bare concrete and one-step synthesis method of low-air-entraining type polycarboxylate superplasticizer
一种清水混凝土适用的低引气型聚羧酸减水剂及其一步合成方法
PAN LISHA (author) / WANG JIANWEI (author) / WANG YUMING (author) / XU SHUYING (author) / LIN CHANG (author) / LI YAN (author) / DU JUAN (author)
2022-09-13
Patent
Electronic Resource
Chinese
Air-entraining type polycarboxylate superplasticizer and preparation method thereof
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