Viscosity reduction type polycarboxylic acid water reducer and preparation method thereof

Abstract

The invention belongs to the field of concrete admixtures and relates to a viscosity reduction type polycarboxylic acid water reducer which is prepared from the following raw materials: polyethylene glycol, maleic anhydride, methylene succinate, methylene succinic acid, a chain transfer agent and an initiator. A preparation method of the viscosity reduction type polycarboxylic acid water reducer comprises the following steps: weighing polyethylene glycol, adding maleic anhydride, performing a reaction, and uniformly mixing polyethylene glycol maleate with a chain transfer agent, an initiator and deionized water to obtain a mixed substrate; mixing methylene succinate, methylene succinic acid and deionized water to obtain a mixed solution A; mixing hexamethylphosphoric triamide and deionized water to obtain a mixed solution B; and dropwise adding the mixed solution A and the mixed solution B into the mixed substrate. By adding the methylene succinate and the methylene succinic acid, the water reducer has better water reducing property and viscosity reducing property. The hexamethylphosphoric triamide is added, so that the viscosity reduction performance of the water reducer is better.

Description

technical field [0001] The application relates to the field of concrete admixtures, more specifically, it relates to a viscosity-reducing polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rapid development of the construction industry and the expansion of my country's infrastructure, the scale of civil engineering has continued to expand, the amount of concrete has also increased, and the requirements for concrete have also increased. High-grade concrete adopts a lower water-binder ratio, and some mineral admixtures are used at the same time, which increases the viscosity of the concrete and slows the flow rate, making construction difficult and affecting the construction progress. How to reduce the viscosity of concrete has become a key issue in the development of high-strength and ultra-high-strength concrete. [0003] Polycarboxylate superplasticizer is a water-soluble copolymer containing polyethylene glycol (PEG) bra...

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Problems solved by technology

[0004] Recently, polycarboxylate water reducer and viscosity reducer are widely used together to reduce water and viscosity of concrete. However, when the two are used together, the problem of poor compatibility between polycarboxylate water reducer and viscosity reducer is likely to occur. Causes segregation and bleeding of concrete, affecting the strength of concrete