Methylacrylic acid polyethylene glycol single armor ether ester and preparation method thereof

Abstract

The invention relates to poly ethyleneglycol monomethylether methacrylate which is monomer of polycarboxylic type concrete water-reducer and a preparation method thereof, wherein the reactants components (percentage by weight) comprises: 9. 32by weight of methacrylic acid, 39. 4by weight of Poly(ethylene glycol) Methyl Ether, 3-7by weight of reaction activating agent, 0. 01-0. 2by weight of side reaction suppressing agent, and 40-60by weight of water-carrying agent; adding all the components into a reactor by the proportion, slowly heating up, preserving heat at 80 degree C for 0. 5-1h, slowly raising temperature until the reactants azeotropy, reacting for 6-8h, naturally cooling to room temperature, and removing the impurity to obtain ethyleneglycol monomethylether methacrylate. The synthetic macromer by the method has steady quality, the esterification ratio can reach more than 99, the macromer can be directly used for synthesizing polycarboxylic type concrete water-reducer and other surface active agents, the prepared concrete water-reducer therewith has a high water-reducing ratio, and reaching to more than 28(wherein the mix amount is 0. 25) which has a better performance than like products, can satisfy the require for development of high performance concrete, and has a wide application future.

Description

technical field [0001] The invention belongs to a polycarboxylic acid-based concrete water-reducing agent macromonomer—polyethylene glycol monomethyl ether methacrylate and a preparation method thereof. technical background [0002] my country ranks first in the world in terms of cement output and usage. According to authoritative estimates, my country's cement output will reach 1 billion tons in 2005. With the rapid development of our country's economy and the country's increasing efforts in infrastructure and housing construction, the demand and performance requirements for concrete will increase year by year, and the high performance of concrete is an inevitable trend. Similarly, the demand for high-efficiency water-reducing agents with high water-reducing ratio and low slump loss will continue to increase. At present, the annual demand for high-efficiency superplasticizers in my country reaches 1 million tons. Naphthalene-based superplasticizers are the most important ...

AI Technical Summary

Problems solved by technology

Naphthalene-based superplasticizers are currently the most important products of high-efficiency water-reducing agents in my country, accounting for 80% of the market share. However, due to the low water-reducing rate of naphthalene-based superplasticizers, the loss of concrete slump is too fast, and it is difficult to meet modern high-efficiency water reducers. The construction requirements of performance concrete, while the quality of composite products is unstable, which often affects the setting, hardening and durability of concrete

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