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Viscosity reduction type polycarboxylic acid slump retaining agent and preparation method thereof
The invention relates to a viscosity reduction type polycarboxylic acid slump retaining agent and a preparation method thereof. The viscosity-reducing polycarboxylic acid slump retaining agent is prepared from the following raw materials in parts by weight: 5-15 parts of phenyl phosphate; 75 to 15 parts of unsaturated polyether; 5 to 15 parts of unsaturated hydroxyl ester; 0.5 to 2 parts of unsaturated acid A; 2-10 parts of a crosslinking monomer; 1-3 parts of an oxidizing agent; 1-3 parts of a reducing agent; 1-5 parts of a chain transfer agent; and water. Phenyl phosphate is introduced into a side chain of the viscosity reduction type polycarboxylic acid slump retaining agent, and the phenyl phosphate on the side chain has a cyclic structure, so that the steric hindrance effect of the viscosity reduction type polycarboxylic acid slump retaining agent is improved, and the viscosity of concrete is reduced. In addition, a phosphate group generated after phenyl phosphate hydrolysis has a retarding effect, so that the setting time of concrete can be prolonged, concrete cracks are reduced, and carboxyl-containing molecular chains released after phenyl phosphate hydrolysis adsorb concrete for the second time, so that a slump retaining effect is achieved.
本发明涉及一种降粘型聚羧酸保坍剂及其制备方法。以重量份数计，降粘型聚羧酸保坍剂的制备原料包括磷酸苯酯5～15份；不饱和聚醚75～15份；不饱和羟基酯5～15份；不饱和酸A0.5～2份；交联单体2～10份；氧化剂1～3份；还原剂1～3份；链转移剂1～5份；以及水。本发明在降粘型聚羧酸保坍剂的侧链中引入磷酸苯酯，由于侧链上的磷酸苯酯具有环状结构，增大了降粘型聚羧酸保坍剂的空间位阻效应，从而降低混凝土的黏度。此外，由于磷酸苯酯水解后产生的磷酸基团具有缓凝效果，可延长混凝土的凝结时间，减少混凝土裂缝，磷酸苯酯水解释放的含羧基分子链二次吸附混凝土，起到保坍效果。
Viscosity reduction type polycarboxylic acid slump retaining agent and preparation method thereof
The invention relates to a viscosity reduction type polycarboxylic acid slump retaining agent and a preparation method thereof. The viscosity-reducing polycarboxylic acid slump retaining agent is prepared from the following raw materials in parts by weight: 5-15 parts of phenyl phosphate; 75 to 15 parts of unsaturated polyether; 5 to 15 parts of unsaturated hydroxyl ester; 0.5 to 2 parts of unsaturated acid A; 2-10 parts of a crosslinking monomer; 1-3 parts of an oxidizing agent; 1-3 parts of a reducing agent; 1-5 parts of a chain transfer agent; and water. Phenyl phosphate is introduced into a side chain of the viscosity reduction type polycarboxylic acid slump retaining agent, and the phenyl phosphate on the side chain has a cyclic structure, so that the steric hindrance effect of the viscosity reduction type polycarboxylic acid slump retaining agent is improved, and the viscosity of concrete is reduced. In addition, a phosphate group generated after phenyl phosphate hydrolysis has a retarding effect, so that the setting time of concrete can be prolonged, concrete cracks are reduced, and carboxyl-containing molecular chains released after phenyl phosphate hydrolysis adsorb concrete for the second time, so that a slump retaining effect is achieved.
本发明涉及一种降粘型聚羧酸保坍剂及其制备方法。以重量份数计，降粘型聚羧酸保坍剂的制备原料包括磷酸苯酯5～15份；不饱和聚醚75～15份；不饱和羟基酯5～15份；不饱和酸A0.5～2份；交联单体2～10份；氧化剂1～3份；还原剂1～3份；链转移剂1～5份；以及水。本发明在降粘型聚羧酸保坍剂的侧链中引入磷酸苯酯，由于侧链上的磷酸苯酯具有环状结构，增大了降粘型聚羧酸保坍剂的空间位阻效应，从而降低混凝土的黏度。此外，由于磷酸苯酯水解后产生的磷酸基团具有缓凝效果，可延长混凝土的凝结时间，减少混凝土裂缝，磷酸苯酯水解释放的含羧基分子链二次吸附混凝土，起到保坍效果。
Viscosity reduction type polycarboxylic acid slump retaining agent and preparation method thereof
一种降粘型聚羧酸保坍剂及其制备方法
YANG HAO (author) / LIU BOBO (author) / MIAO DONGHUI (author) / DONG LIWEI (author)
2023-04-25
Patent
Electronic Resource
Chinese
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