Polycarboxylic acid water reducing agent with narrow molecular weight distribution and preparation method thereof

Abstract

The invention discloses a polycarboxylic acid water reducing agent with narrow molecular weight distribution and a preparation method thereof, belonging to the technical field of slump retaining agentpreparation. The polycarboxylic acid water reducing agent with narrow molecular weight distribution and the preparation method thereof realize that the molecular weight distribution and controllability of the obtained polycarboxylic acid high-efficiency water reducing agent are greatly improved. After propyl polyoxyethylene ether is mixed with a water-soluble initiator and a water-soluble activechain transfer agent, the obtained molecular weight distribution is narrower, and the dispersibility of the product is better. At the same time, sodium methacrylate sulfonate and modified acrylate compounds are added to facilitate improving of the early strength, slump retention, reinforcement and other properties of the prepared polycarboxylic acid water reducing agent; moreover, a heat preservation interlayer with an automatic regulation function is arranged in a reaction kettle, is beneficial to realizing the conversion of heat transfer and cold transfer in the heat preservation interlayer,improving the lifting sensitivity of the temperature in the reaction kettle, eliminating the need for manual temperature regulation, and effectively avoiding the influence on the preparation of the polycarboxylic acid water reducing agent caused by large temperature control difficulty.

Description

technical field [0001] The invention relates to the technical field of preparation of polycarboxylate water reducers, more specifically, to a polycarboxylate water reducer with narrow molecular weight distribution and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is a high-performance superplasticizer and a cement dispersant used in cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. In many concrete projects, traditional high-efficiency concrete such as naphthalene series is increasingly unable to meet the needs of projects due to limitations in technical performance. [0003] A new generation of water reducer that has attracted much attention at home and abroad, polycarboxylate high-performance water reducer, because it has truly designed an effective molecular structure based on the mechanism of dispersed cement, has a super-dispersion type, and can prevent concrete slump ...

AI Technical Summary

Problems solved by technology

But the controllability of this kind of polymerization reaction is poor, can not obtain the polymerization product of molecular weight in the specified range, if the molecular weight of polymerization product is bigger or smaller, often all be difficult to reach optimal dispersing effect; The distribution also has a certain influence, so the staff need to continuously measure the temperature in the reactor, and need to manually adjust the temperature, the operation is cumbersome, and the accuracy of temperature control is poor, and the best environment for preparation cannot be achieved.

Images