Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention relates to the field of preparation of building material; enol polyether is prepared from ethylene oxide and propylene oxide by using a block copolymerization method, the enol polyetheris copolymerized with silicon-based modified oleic acid containing double bonds to prepare modified polyether molecules with multiple molecular chain segments in molecular chains, and the modified polyether molecules are applied to synthesis of a polycarboxylic acid water reducing agent; through complex chain segments, the steric hindrance of molecules is increased, the interaction force between macromolecular chains is reduced, the viscosity of a solution is reduced, and finally, the surface tension of the synthesized polycarboxylate water reducing agent is reduced, so that cement particles are more effectively dispersed, the agglomeration phenomenon of the cement particles is reduced, and the fluidity of concrete is improved. The water reducing agent provided by the invention can obtainhigh fluidity and reduce the use amount of water under the condition of low mixing amount, so that the dry shrinkage phenomenon of concrete is avoided, the compactness of the concrete is improved, theworking performance of the concrete is improved, and the service life of the concrete is prolonged.
本发明涉及建筑材料制备领域，本发明使用嵌段共聚的方法将环氧乙烷和环氧丙烷制备成烯醇聚醚，然后与含双建的硅基改性油酸共聚，制备了分子链中有多个分子链段的改性聚醚分子，将其应用到聚羧酸减水剂的合成中，能通过复杂的链段，增加分子空间位阻，减小大分子链间相互作用力，降低溶液粘度，最终导致减小所合成的聚羧酸减水剂的表面张力，使得水泥颗粒得到了更有效的分散，减少了水泥颗粒的凝聚现象，从而使混凝土的流动性得到了提高。本发明的减水剂在低掺量下，能够获得较高的流动度，减少水的用量，这就避免了混凝土的干缩现象，提高了混凝土的密实度，从而提高了混凝土的工作性能和使用寿命。
The invention relates to the field of preparation of building material; enol polyether is prepared from ethylene oxide and propylene oxide by using a block copolymerization method, the enol polyetheris copolymerized with silicon-based modified oleic acid containing double bonds to prepare modified polyether molecules with multiple molecular chain segments in molecular chains, and the modified polyether molecules are applied to synthesis of a polycarboxylic acid water reducing agent; through complex chain segments, the steric hindrance of molecules is increased, the interaction force between macromolecular chains is reduced, the viscosity of a solution is reduced, and finally, the surface tension of the synthesized polycarboxylate water reducing agent is reduced, so that cement particles are more effectively dispersed, the agglomeration phenomenon of the cement particles is reduced, and the fluidity of concrete is improved. The water reducing agent provided by the invention can obtainhigh fluidity and reduce the use amount of water under the condition of low mixing amount, so that the dry shrinkage phenomenon of concrete is avoided, the compactness of the concrete is improved, theworking performance of the concrete is improved, and the service life of the concrete is prolonged.
本发明涉及建筑材料制备领域，本发明使用嵌段共聚的方法将环氧乙烷和环氧丙烷制备成烯醇聚醚，然后与含双建的硅基改性油酸共聚，制备了分子链中有多个分子链段的改性聚醚分子，将其应用到聚羧酸减水剂的合成中，能通过复杂的链段，增加分子空间位阻，减小大分子链间相互作用力，降低溶液粘度，最终导致减小所合成的聚羧酸减水剂的表面张力，使得水泥颗粒得到了更有效的分散，减少了水泥颗粒的凝聚现象，从而使混凝土的流动性得到了提高。本发明的减水剂在低掺量下，能够获得较高的流动度，减少水的用量，这就避免了混凝土的干缩现象，提高了混凝土的密实度，从而提高了混凝土的工作性能和使用寿命。
Preparation method of silicon-based modified oleic acid polycarboxylate water reducing agent
一种硅基改性油酸聚羧酸减水剂的制备方法
ZHU YIFEI (Autor:in)
11.12.2020
Patent
Elektronische Ressource
Chinesisch
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