A reactive intermediate and reactive macromonomer

Abstract

The invention provides a reactive intermediate. The reactive intermediate can be used for preparation of a reactive macromonomer. A preparation method has the advantages of simplicity and convenience in operation, high yield and the like. The reactive macromonomer can improve the steric hindrance effect among cement particles, can effectively avoid an intercalation function of PEO (polyoxyethylene) side chains and has good clay resistance. A super-high early-strong polycarboxylate superplasticizer synthetized with the reactive macromonomer as a main raw material can promote the hydration function of cement and accelerate strength development of hardened cement and performs a super-high early-strength function; the problem of poor dispersion performance of existing PCEs (polycarboxylate superplasticizers) in the concrete containing clay can be effectively solved, representation and tests show that the super-high early-strong polycarboxylate superplasticizer synthetized with the reactive macromonomer as the main raw material has good dispersion performance for the concrete with or without the clay, and the dispersion performance of the PCEs in the concrete containing the clay is better than that of traditional PCEs.

Description

technical field [0001] The invention relates to an intermediate and a macromonomer, in particular to an active intermediate and an active macromonomer. Background technique [0002] In recent years, the research and production of concrete admixtures have tended to develop in the direction of high performance and no pollution. Concrete water reducer is the most widely used and most used concrete admixture. Polycarboxylate superplasticizers (PCEs) with a comb-like molecular structure are generally composed of polyethoxyl (PEO) side chains grafted to the main chain of anions, and the PEO side chains create spaces between cement particles suspended in the water phase. The steric hindrance effect, by adjusting the molecular structure of PCEs, can achieve different purposes, such as good slump retention, high water reducing rate, good cohesion, good mud resistance, etc., coupled with the advantages of low cost and no pollution, polycarboxylate The research on acid water reducer h...

AI Technical Summary

Problems solved by technology

[0012] APEG is the main raw material for the synthesis of polycarboxylic acid-based high-performance water-reducers. The synthesized PCEs water-reducers have the advantages of good dispersibility, low dosage, high water-reducing rate, and good adaptability; the disadvantage is poor cement adaptability, slump big time loss

The water reducing rate of the water reducing agent produced by HPEG and TPEG is not much different, but when used in summer, there is a big gap in slump retention, and the cement adaptability is slightly poor

The PCE polycarboxylate high-performance superplasticizer produced with TPEG as the main raw material has simple production process and equipment, and its slump retention and cement adaptability are better than HPEG. The disadvantage is that the supply of raw materials is insufficient.

[0013] The common structure of PCEs water reducer is PEO side chain. However, PEO side chain is easy to insert into the aluminosilicate sheet structure of clay, so the water reducer cannot be adsorbed on the surface of cement particles, but forms chemical adsorption with clay. , which weakens the combing performance of the PCE

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