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Preparation method for modified starch comb-shaped copolymer

A comb-like copolymer and starch technology, applied in the field of materials, can solve the problems of large amount of water reducing agent, low molecular anion charge, and the electrostatic repulsion cannot be fully exerted, and achieves excellent performance, avoids excessive retardation, and has good performance. Beneficial effect of dispersion

Inactive Publication Date: 2016-01-27
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of oxidizing starch in the prior art, carboxyl groups are introduced, but the charge of molecular anions will be lower, and the electrostatic repulsion effect cannot be fully exerted, so the dosage is relatively large when used as a water reducer

Method used

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  • Preparation method for modified starch comb-shaped copolymer
  • Preparation method for modified starch comb-shaped copolymer
  • Preparation method for modified starch comb-shaped copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: a kind of preparation method of modified starch type comb copolymer comprises the following steps:

[0031] a, preparation of sulfonated starch

[0032] Take amylose with a number average molecular weight of 12,000, add water to prepare starch milk with a starch weight percentage of 30%, then add concentrated sulfuric acid 1.5 times the weight of the starch, react at 50°C for 40 minutes, and then wash and dry. Prepare sulfonated starch;

[0033] b. Preparation of esterified starch

[0034] Take sulfonated starch, add water to prepare sulfonated starch milk with 30% by weight of sulfonated starch, add dropwise aqueous solution of maleic anhydride with 50% by weight of maleic anhydride at 50°C within 0.5h, The molar ratio of acid anhydride to sulfonated starch is 1.2:1, followed by heat preservation for 3 hours, followed by washing and drying to obtain esterified starch;

[0035] c, preparation of modified starch type comb copolymer

[0036] Prepare este...

Embodiment 2

[0037] Embodiment 2: a kind of preparation method of modified starch type comb copolymer, comprises the following steps:

[0038] a, preparation of sulfonated starch

[0039] Take amylose with a number average molecular weight of 26,000, add water to prepare starch milk with a starch weight percentage of 30%, then add concentrated sulfuric acid 1.5 times the weight of the starch, react at 45°C for 40 minutes, and then wash and dry. Prepare sulfonated starch;

[0040] b. Preparation of esterified starch

[0041] Take sulfonated starch, add water to prepare sulfonated starch milk with 30% by weight of sulfonated starch, add dropwise aqueous solution of maleic anhydride with 50% by weight of maleic anhydride at 50°C within 0.5h, The molar ratio of acid anhydride to sulfonated starch is 1.5:1, followed by heat preservation for 3 hours, followed by washing and drying to obtain esterified starch;

[0042] c, preparation of modified starch type comb copolymer

[0043] Prepare est...

Embodiment 3

[0044] Embodiment 3: a kind of preparation method of modified starch type comb copolymer, comprises the following steps:

[0045] a, preparation of sulfonated starch

[0046] Take amylose with a number average molecular weight of 20,000, add water to prepare starch milk with a starch content of 30% by weight, then add concentrated sulfuric acid twice the weight of the starch, react at 50°C for 40 minutes, and then wash and dry. Prepare sulfonated starch;

[0047] b. Preparation of esterified starch

[0048] Take sulfonated starch, add water to prepare sulfonated starch milk with 30% by weight of sulfonated starch, add dropwise aqueous solution of maleic anhydride with 50% by weight of maleic anhydride at 50°C within 0.5h, The molar ratio of acid anhydride to sulfonated starch is 1.5:1, followed by heat preservation for 3.5 hours, followed by washing and drying to obtain esterified starch;

[0049]c, preparation of modified starch type comb copolymer

[0050] Prepare esteri...

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Abstract

The invention discloses a preparation method for a modified starch comb-shaped copolymer. The preparation method comprises: sulfonated starch is prepared, an esterification reaction with maleic anhydride is carried out, esterified starch is prepared, finally, a copolymerization reaction is carried out and a modified starch comb-shaped copolymer product is obtained. The prepared comb-shaped copolymer forms strong steric hindrance on outer surfaces of cement particles, is beneficial for dispersion effects, and has a high water-reducing rate and shrinkage ratio.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a modified starch-type comb copolymer and its preparation method and application. Background technique [0002] Concrete is the largest and most widely used construction material today. The addition of concrete admixtures plays a great role in improving the performance of concrete and developing concrete construction technology. It has become an indispensable part of concrete in addition to cement, sand, stone and water. of the fifth component. At present, the types of high-efficiency concrete water-reducers used in my country are mainly modified lignosulfonate water-reducers, naphthalenesulfonic acid formaldehyde condensation product water-reducers, melamine-based water-reducers, sulfamate water-reducers, aliphatic The main body of the second-generation high-efficiency water-reducer such as water-reducing agent is supplemented by the third-generation polycarboxylate-based wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F222/06C08B31/04C08B31/06C04B24/38C04B103/30
Inventor 卫爱国陈林顾旭卫爱萍
Owner YANCHENG INST OF TECH
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