Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Modified chitosan and preparation method thereof, delayed coagulation type water reducing agent and application of delayed coagulation type water reducing agent
The invention belongs to the technical field of building materials, and discloses modified chitosan, a preparation method thereof, a retarding type water reducing agent and application. The modified chitosan provided by the invention is a compound in which a chitosan molecular chain is bonded with an amino acid chelation-like structure, and the amino acid chelation-like structure can play a synergistic role with the steric effect of the spatial three-dimensional structure of the chitosan; due to the addition of the modified chitosan, the concentration of metal ions in early concrete slurry can be in a dynamic equilibrium state, and the effect of reducing the early hydration rate is achieved; and a certain amount of hydroxyl groups are reserved on the molecular chain of the modified chitosan, so that a large amount of water can be adsorbed while metal ions are chelated, and then the later hydration reaction of the concrete is promoted. The water reducing agent obtained by compounding the modified chitosan provided by the invention with other components such as polycarboxylic acid has excellent water reducing performance, retarding performance and slump retaining performance, and has a good application prospect.
本发明属于建筑材料的技术领域，公开了一种改性壳聚糖及其制备方法、缓凝型减水剂和应用。本发明提供的改性壳聚糖为壳聚糖分子链上键连有类氨基酸螯合型结构的化合物，该类氨基酸螯合型结构可与壳聚糖本身空间立体结构的位阻效应协同发挥作用，该改性壳聚糖的添加可使早期混凝土浆体中金属离子浓度处于动态平衡状态，起到降低早期水化速率的效果；并且该改性壳聚糖分子链上还保留一定量的羟基，能够在螯合金属离子的同时吸附大量的水，进而促进混凝土后期水化反应的进行。本发明提供的改性壳聚糖与聚羧酸等其他组分复配所得的减水剂兼具优秀的减水性能、缓凝性能和保坍性能，应用前景良好。
Modified chitosan and preparation method thereof, delayed coagulation type water reducing agent and application of delayed coagulation type water reducing agent
The invention belongs to the technical field of building materials, and discloses modified chitosan, a preparation method thereof, a retarding type water reducing agent and application. The modified chitosan provided by the invention is a compound in which a chitosan molecular chain is bonded with an amino acid chelation-like structure, and the amino acid chelation-like structure can play a synergistic role with the steric effect of the spatial three-dimensional structure of the chitosan; due to the addition of the modified chitosan, the concentration of metal ions in early concrete slurry can be in a dynamic equilibrium state, and the effect of reducing the early hydration rate is achieved; and a certain amount of hydroxyl groups are reserved on the molecular chain of the modified chitosan, so that a large amount of water can be adsorbed while metal ions are chelated, and then the later hydration reaction of the concrete is promoted. The water reducing agent obtained by compounding the modified chitosan provided by the invention with other components such as polycarboxylic acid has excellent water reducing performance, retarding performance and slump retaining performance, and has a good application prospect.
本发明属于建筑材料的技术领域，公开了一种改性壳聚糖及其制备方法、缓凝型减水剂和应用。本发明提供的改性壳聚糖为壳聚糖分子链上键连有类氨基酸螯合型结构的化合物，该类氨基酸螯合型结构可与壳聚糖本身空间立体结构的位阻效应协同发挥作用，该改性壳聚糖的添加可使早期混凝土浆体中金属离子浓度处于动态平衡状态，起到降低早期水化速率的效果；并且该改性壳聚糖分子链上还保留一定量的羟基，能够在螯合金属离子的同时吸附大量的水，进而促进混凝土后期水化反应的进行。本发明提供的改性壳聚糖与聚羧酸等其他组分复配所得的减水剂兼具优秀的减水性能、缓凝性能和保坍性能，应用前景良好。
Modified chitosan and preparation method thereof, delayed coagulation type water reducing agent and application of delayed coagulation type water reducing agent
一种改性壳聚糖及其制备方法、缓凝型减水剂和应用
WU CHUANDENG (Autor:in) / LIN ZHIQUN (Autor:in) / LI GELI (Autor:in) / FANG YUNHUI (Autor:in) / KE YULIANG (Autor:in) / LIN TIANXING (Autor:in) / GUO YUANQIANG (Autor:in) / WU WENXIAN (Autor:in) / ZHANG JIAYAN (Autor:in) / XIE FEI (Autor:in)
19.03.2024
Patent
Elektronische Ressource
Chinesisch
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