Ether type polycarboxylic acid concrete water reducer containing chitosan and preparation method thereof

Abstract

The invention provides an ether type polycarboxylic acid concrete water reducer containing chitosan and a preparation method thereof. The concrete water reducer is a polymerization product, and is obtained by a polymerization reaction of the following components in percentage by mass: 0.02-12.6% of chitosan, 3-65% of a polyoxyalkylene based ether type unsaturated macromonomer, 1-40% of unsaturated carboxylic acid and / or unsaturated acid anhydride, 0.02-8% of an unsaturated carboxylic acid derivative and / or unsaturated ether, and 25-95% of water. The ether type polycarboxylic acid concrete water reducer provided by the invention has a simple synthetic process and a relatively low production cost; and the obtained water reducer not only has a high water reducing rate but also can obviously improve phenomena of easy segregation and easy bleeding of concrete to obviously improve workability and fluidity of concrete, and has a very significant effect of improving the long-term strength of concrete.

Description

【Technical field】 [0001] The invention belongs to the macromolecule fine chemical product in the technical field of building material concrete, is related to the application of chitosan, a marine material, and specifically relates to a chitosan-containing ether polycarboxylate concrete water reducer and a preparation method thereof. 【Background technique】 [0002] The application of water reducing agent in concrete can significantly improve the working performance of concrete, increase the strength and durability of concrete. Polycarboxylate high-performance water reducer is a new generation of water reducer developed after ordinary water reducers represented by wood calcium and high-efficiency water reducers represented by naphthalene series. With unique advantages such as water-reducing rate and environmental protection, it is a kind of concrete water-reducing agent that is the most advanced in the world, has excellent comprehensive performance and is widely used. [0003...

AI Technical Summary

Problems solved by technology

[0003] In recent years, based on the influence of factors such as the development of concrete technology, market competition, cost control, and the reduction in the amount and quality of cementitious materials in commercial concrete, it is difficult for a single polycarboxylate water reducer to meet the cohesion of ready-mixed concrete. Requirements for water retention and water retention, resulting in bleeding and segregation of the concrete mixture, resulting in poor workability

In order to ensure the normal construction of concrete and improve work efficiency, it is necessary to compound and use thickening components. However, both theoretical research and engineering practice have found that the compatibility between polycarboxylate water reducers and commonly used thickening components is poor, and thickening components The use of thickeners is not efficient, which brings great difficulty to the thickening compounding of polycarboxylate superplasticizers and makes the production process more complicated; in addition, polycarboxylate superplasticizers on the market now The synthesis process is mainly the product obtained by addition polymerization of petroleum-based monomers such as polyoxyalkylene ether unsaturated macromonomers and unsaturated carboxylic acid derivatives. The depletion of petroleum resources will make petroleum-based monomers The petrochemical industry with body as raw material is unsustainable

The introduction of marine material chitosan into polycarboxylate superplasticizer has not been reported at home and abroad