Low-molecular-weight sulfonated starch water reducer and preparation method thereof

Abstract

The invention mainly aims to provide a low-molecular-weight sulfonated starch water reducer and a preparation method thereof. The method comprises the following steps: adding starch into a sulfonationsolution containing concentrated sulfuric acid to carry out sulfonation reaction, filtering to obtain a solid substance and a liquid substance, dissolving the solid substance in water, and adjustingthe pH value to 7 to obtain the low-molecular-weight sulfonated starch water reducer solution. The technical problem to be solved is to prepare the low-molecular-weight sulfonated starch water reducerwith a high water reducing rate by controlling a sulfonating reagent and process conditions of sulfonating reaction, and overcome process defects in the prior art, so that the low-molecular-weight sulfonated starch water reducing agent is more practical.

Description

technical field [0001] The invention belongs to the technical field of modified starch application, and in particular relates to a low molecular weight sulfonated starch water reducer and a preparation method thereof. Background technique [0002] As a common cement concrete admixture, water reducing agent can significantly reduce the water consumption of concrete while maintaining the workability of cement concrete. Common water reducers include lignin water reducer, naphthalene water reducer and polycarboxylic acid high performance water reducer. Lignin water reducer has limited water reducing effect due to its rigid structure, while naphthalene water reducer Polycarboxylate high-performance superplasticizers and polycarboxylate superplasticizers are both produced and processed based on petrochemical raw materials. There is an urgent need in the market to use renewable resources to prepare and synthesize environmentally friendly and high-efficiency water-reducing superplas...

AI Technical Summary

Problems solved by technology

Such as, the relatively high temperature of some sulfonation reactions causes the disadvantage of higher energy consumption; some sulfonation reactions are carried out at negative temperatures, resulting in longer reaction times; moreover, the sulfonation reagents used in the prior art are toxic , there is a hidden danger of pollution to the environment; after the sulfonation is completed, the sulfonation solution cannot be recycled, resulting in a waste of resources; researchers have recently discovered that the mechanism of action of high-performance water reducers is the mechanism of steric hindrance, and amylopectin has Large steric hindrance, but due to insufficient technology, it is difficult to realize the utilization of amylopectin

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