Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Slump-retaining polycarboxylate superplasticizer and preparation method thereof
The invention relates to the technical field of cement water reducing agents, in particular to a slump-retaining polycarboxylic acid water reducing agent and a preparation method thereof. The slump-retaining polycarboxylic acid water reducer is mainly prepared from polyether macromonomer containing double bonds, acrylic acid, hydroxyethyl acrylate, siloxane containing terminal double bonds, and acid and/or ester containing double bonds and fluorine elements. According to the present invention, the contained carboxyl group is subjected to initial protection, and is hydrolyzed in the alkaline environment to release the carboxyl group, such that the adsorption of the water reducing agent molecules on the cement particle surface is maintained, the particle aggregation is avoided, the slump loss in the hydration process is reduced, and the ester group is introduced so as to maintain the water reducing performance and provide the good dispersion retention property; according to the present invention, the application performance of the concrete is improved, the concrete pumping time is prolonged, and the fluorine element and the siloxane with the specific content are introduced, such that the good chemical corrosion resistance and the good weather resistance are provided.
本申请涉及水泥减水剂技术领域，尤其是一种保坍型聚羧酸减水剂及其制备方法。一种保坍型聚羧酸减水剂主要是由含有双键的聚醚大单体、丙烯酸、丙烯酸羟乙酯、含有端双键的硅氧烷、含有双键和氟元素的酸和/或酯。本申请对含有的羧基进行初期保护，然后在碱性环境中水解释放羧基，维持减水剂分子在水泥颗粒表面的吸附，避免颗粒聚集，减小水化过程中坍落度损失，同时引入酯基基团，使其在保持减水性能的同时具有很好的分散保持性，提高混凝土的应用性能，延长泵送混凝土的时间，且引入特定含量的氟元素和硅氧烷，赋予了较好的耐化学腐蚀性和耐候性能。
Slump-retaining polycarboxylate superplasticizer and preparation method thereof
The invention relates to the technical field of cement water reducing agents, in particular to a slump-retaining polycarboxylic acid water reducing agent and a preparation method thereof. The slump-retaining polycarboxylic acid water reducer is mainly prepared from polyether macromonomer containing double bonds, acrylic acid, hydroxyethyl acrylate, siloxane containing terminal double bonds, and acid and/or ester containing double bonds and fluorine elements. According to the present invention, the contained carboxyl group is subjected to initial protection, and is hydrolyzed in the alkaline environment to release the carboxyl group, such that the adsorption of the water reducing agent molecules on the cement particle surface is maintained, the particle aggregation is avoided, the slump loss in the hydration process is reduced, and the ester group is introduced so as to maintain the water reducing performance and provide the good dispersion retention property; according to the present invention, the application performance of the concrete is improved, the concrete pumping time is prolonged, and the fluorine element and the siloxane with the specific content are introduced, such that the good chemical corrosion resistance and the good weather resistance are provided.
本申请涉及水泥减水剂技术领域，尤其是一种保坍型聚羧酸减水剂及其制备方法。一种保坍型聚羧酸减水剂主要是由含有双键的聚醚大单体、丙烯酸、丙烯酸羟乙酯、含有端双键的硅氧烷、含有双键和氟元素的酸和/或酯。本申请对含有的羧基进行初期保护，然后在碱性环境中水解释放羧基，维持减水剂分子在水泥颗粒表面的吸附，避免颗粒聚集，减小水化过程中坍落度损失，同时引入酯基基团，使其在保持减水性能的同时具有很好的分散保持性，提高混凝土的应用性能，延长泵送混凝土的时间，且引入特定含量的氟元素和硅氧烷，赋予了较好的耐化学腐蚀性和耐候性能。
Slump-retaining polycarboxylate superplasticizer and preparation method thereof
一种保坍型聚羧酸减水剂及其制备方法
PU YINGJIE (Autor:in) / CAI YU (Autor:in) / QIAN KEWEI (Autor:in) / HU AILIANG (Autor:in) / FANG QUNCONG (Autor:in) / JIANG YUCHUN (Autor:in) / LU YEPING (Autor:in) / SHI QINFEI (Autor:in)
17.10.2023
Patent
Elektronische Ressource
Chinesisch
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