Starch sulphate and its application in concrete

A technology of starch sulfate and concrete, applied to starch sulfate and the application field in concrete, can solve the problems of unstable quality of composite products, pollution, low water reduction efficiency, etc., and achieves good industrial application prospects, broad development prospects, simple craftsmanship

Inactive Publication Date: 2007-02-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since calcium lignosulfonate is a by-product of pulp produced by the sulfuric acid process, although this type of water reducing agent is cheap, its water reducing efficiency is low, so its application in concrete, especially high-performance concrete, is limited.
In addition, sulfuric acid papermaking will produce a lot of pollution. With the improvement of papermaking technology, the raw material source of wood calcium water reducer is facing challenges
The disadvantage of naphthalene-based super

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Preparation of starch sulfate with degree of substitution = 0.047: use dichloroethane as solvent, chlorosulfonic acid as sulfonating reagent, wherein the molar ratio of chlorosulfonic acid to starch is 0.6, 10 ml of dichloroethane, react for 1 hour at room temperature Finally, neutralize with 5 mol / liter of sodium hydroxide to obtain the crude product of starch sulfate, take a certain amount and pour it into a dialysis bag for dialysis for 24 hours, and then freeze-dry for 24 hours to obtain a refined product for ICP testing. Starch sulfate with a degree of substitution of 0.047 was obtained.

example 2

[0016] Preparation degree of substitution = 0.06 starch sulfate: use dichloroethane as solvent, chlorosulfonic acid as sulfonating reagent, wherein the molar ratio of chlorosulfonic acid to starch is 1.0, 16 ml of chloroform, react at room temperature for 2 hours, 5 The crude product of starch sulfate can be obtained by neutralizing mol / liter of sodium hydroxide. A certain amount is poured into a dialysis bag for dialysis for 24 hours, and then freeze-dried for 24 hours to obtain a refined product for ICP testing. The degree of substitution can be obtained as 0.06 starch sulfate.

example 3

[0018] Preparation of starch sulfate with degree of substitution = 0.11: use dichloromethane as solvent, chlorosulfonic acid as sulfonating reagent, wherein the molar ratio of chlorosulfonic acid to starch is 1.2, 20 ml of dichloroethane, react at room temperature for 4 hours , 5mol / L of sodium hydroxide can be neutralized to obtain the crude product of starch sulfate, take a certain amount and pour it into a dialysis bag for dialysis for 24 hours, and then freeze-dry for 24 hours to obtain a refined product for ICP testing to obtain the degree of substitution Starch sulfate of 0.11.

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PUM

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Abstract

The present invention relates to starch sulfate and its preparation and application in concrete. Starch sulfate is prepared through one semi-dry process with chrlorosulfonic acid and starch in the molar ratio of 0.5-1.5 to 1 and organic solvent in 1-2 times volume of chrlorosulfonic acid, and through reaction for 1-4 hr. It has degree of substitution in 0.04-0.12, and molecular weight of (40-55)x10<6>. The starch sulfate is used as water reducing agent for concrete, and the added amount is 0.3-2 wt%. The starch sulfate itself is one kind of surfactant and possesses excellent application as concrete water reducing agent.

Description

technical field [0001] The invention relates to the preparation of starch sulfate and its application in concrete. Background technique [0002] The preparation method of starch sulfate mainly contains concentrated sulfuric acid, complexes of sulfur trioxide and amines, sodium bisulfite and sodium nitrate as sulfonating reagents. Wherein, concentrated sulfuric acid is a sulfonating reagent, and its product degradation of the obtained starch sulfate is serious, and inorganic salt sodium bisulfite and sodium nitrate are sulfonating reagents, and the degree of substitution of the product is low; The complex compound of sulfur trioxide and amine is Sulfonated reagents, although the degree of substitution is easier to control, have higher production costs and little industrial value. [0003] Water reducer is a concrete admixture that can reduce the water consumption of concrete mixing under the premise of maintaining the performance of concrete. ...

Claims

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Application Information

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IPC IPC(8): C04B24/38
Inventor 魏玉萍程发
Owner TIANJIN UNIV
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