Preparation method of unsaturated ester containing alcohol amine group, obtained product and application thereof

Abstract

The invention discloses an unsaturated ester containing an alcohol amine group, and a preparation method and an application thereof. The unsaturated ester containing the alcohol amine group is formedby esterification reaction of an alcohol amine compound and unsaturated anhydride. The preparation method is simple, the preparation process is easy to control, the yield is high, and industrialized production is convenient. The early strength of a cement-based material can be significantly improved by introducing the unsaturated ester containing the alcohol amine group into molecules of a polycarboxylic water reducer. Carboxylic groups and ester groups of unsaturated monomers can make the polycarboxylic water reducer have good dispersibility and dispersion retention property; the alcohol amine group can be complexed with metal ions in cement slurry and forms stable complexes with the metal ions, so the hydration of cement minerals can be promoted, ettringite is generated, the diffusion rate of hydration products is improved, the hydration accelerating period of cement is accelerated to enter, the setting time is shortened, and the early strength of the cement-based material is increased.

Description

technical field [0001] The invention relates to a preparation method of an unsaturated ester containing an alcoholamine group, a product and an application thereof, and belongs to the technical field of building materials. Background technique [0002] In the field of construction engineering, concrete is the most widely used civil engineering material. Concrete is required for building houses, repairing dikes and dams, and building railways. With the development of the times, higher requirements are placed on the performance of concrete, and higher requirements are placed on the functionality of polycarboxylate superplasticizers. Polycarboxylate superplasticizer has the characteristics of low dosage, high water reducing rate, good workability and durability of concrete mixture, and has broad market application prospects. [0003] In low temperature environment, polycarboxylate superplasticizer is not conducive to cement hydration, prolongs the setting time, and has a certa...

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Problems solved by technology

[0005] At present, there are two main approaches to the synthesis of early-strength polycarboxylate superplasticizers: (1) compounding: adding inorganic or organic components with early-strength functions to ordinary polycarboxylate superplasticizers. The dosage of early-strength functional components is not easy to control, which is unfavorable to the development of concrete strength, and the compound system is prone to delamination, and the storage stability becomes poor

(2) Synthesis: Synthetic methods are used to make use of the properties of its molecules that can be modified, and to use free radical polymerization to synthesize early-strength polycarboxylate superplasticizers. Currently, isopropanolamine and carbon-oxygen heterocycles are used to reduce However, the water-reducing agents obtained by these methods have limited improvement in the early strength of cement, and there are problems such as high production cost, large dosage and complicated preparation process. It is necessary to further search for better early-strength functional units body for the preparation of early-strength polycarboxylate superplasticizer

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