Preparation method of starch grafting concrete thickener

A technology of starch grafting and concrete, which is used in the preparation of concrete thickeners and starch graft concrete thickeners, and can solve the problems of reduced concrete performance, prolonged initial and final setting times, and concrete slump Reduce and other problems, achieve good adaptability, simple and convenient operation steps, and improve the effect of segregation

Inactive Publication Date: 2017-05-10
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polysaccharides will cause the initial setting and final setting time to prolong with the increase of its content, and the early strength of concrete is too low
The solubility of polyvinyl alcohol is poor, and it is easy to produce flocculent precipitation when compounded with polycarboxylic acid, which makes the homogeneity of the admixture worse
On the one hand, xanthan gum and cellulose ether can effectively reduce concrete bleeding, but on the other hand, it can reduce the slump of concrete, reduce the performance of concrete, and increase the difficulty of construction
The above concrete thickeners are difficult to solve practical engineering problems

Method used

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  • Preparation method of starch grafting concrete thickener
  • Preparation method of starch grafting concrete thickener

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1) Dissolve 65 g of tapioca starch in water, stir to prepare a starch solution with a concentration of 25% by mass, heat at 69°C to gelatinize, add 0.51 g of cerium ammonium nitrate, and react for 1.5 hours to obtain a starch free radical solution;

[0025] 2) Add 20 g of isopropyl acrylamide and 4 g of sodium allyl sulfonate into the reactor under the condition of 36°C, stir evenly, and then dropwise add 2.8 g of potassium persulfate and 0.9 g of isoascorbic acid. Aqueous solution, reaction time 3h, to obtain starch graft;

[0026] 3) After the reaction is completed, it is washed with ethanol, filtered by suction, dried, adjusted to pH 6 with sodium hydroxide, and added with water to obtain a starch graft concrete thickener with a concentration of 15% by mass.

Embodiment 2

[0028] 1) Dissolve 25g of corn starch in water, stir to prepare a starch solution with a concentration of 30% by mass, heat at 51°C to gelatinize, add 0.30g of potassium permanganate, and react for 1h to obtain a starch free radical solution;

[0029] 2) At 60℃, add 20g of acrylamide and 15g of sodium methallyloxysulfonate into the reactor, stir evenly, and then add 1.1g of ammonium persulfate and 0.21g of sodium ascorbate respectively. Aqueous solution, reaction time 4h, to obtain starch graft;

[0030] 3) After the reaction is completed, it is washed with ethanol, filtered by suction, dried, adjusted to pH 6 with sodium hydroxide, and added with water to obtain a starch graft concrete thickener with a concentration of 20% by mass.

Embodiment 3

[0032] 1) Dissolve 39 g of potato starch in water, stir to prepare a starch solution with a concentration of 15% by mass, heat it at 70°C for gelatinization, add 0.195 g of benzoyl peroxide, and react for 2 hours to obtain a starch free radical solution;

[0033] 2) At 46℃, add 20g of N-vinylpyrrolidone and 8g of 2-acrylamido-2-methylpropanesulfonic acid into the reactor, stir evenly, and then add 2.9g and 1.2g of hydrogen peroxide dropwise respectively. An aqueous solution of sodium bisulfate, reaction time 2h, to obtain starch grafts;

[0034] 3) After the reaction is completed, it is washed with ethanol, filtered by suction, dried, adjusted to pH 7 with potassium hydroxide, and water is added to obtain a starch graft concrete thickener with a mass percentage concentration of 10%.

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Abstract

The invention discloses a preparation method of a starch grafting concrete thickener. The preparation method comprises the following steps: 1) pasting starch and obtaining a starch free radical under the effect of an initiator A; 2) performing water-phase free radical polymerization of the starch free radical, unsaturated amide small monomer and unsaturated sulfonic acid small monomer under the joint effect of an initiator B and a reducing agent system to obtain a copolymerization product; and 3) after reaction, washing with ethanol, performing suction filtration, drying, adjusting the pH to 6-7 with alkali liquor, and adding water to obtain a starch grafting concrete thickener with concentration of 10-20% by mass. The method disclosed by the invention has high efficiency and is easy to operate. The starch grafting concrete thickener prepared in the invention can remarkably improve the water retention capacity of concrete, and solves the problems of disintegration and bleeding of concrete while the product performance is stable.

Description

Technical field [0001] The invention relates to a method for preparing a concrete thickener, in particular to a method for preparing a starch graft concrete thickener, and belongs to the field of concrete admixtures. Background technique [0002] With the continuous progress of society, industrial development requires higher and higher engineering quality. As an important material in engineering construction, concrete has been paid close attention to its performance. However, in the actual engineering application process, due to the consumption of construction resources, the quality of aggregates on the market has deteriorated, resulting in unreasonable gradation. In addition, in the laboratory and engineering, in order to ensure the rheological properties of fresh concrete, improve the polycarboxylic acid The content of water-reducing agent, and the third-generation polycarboxylic acid high-performance water-reducing agent is more sensitive to the content of other water-reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/54C08F220/56C08F226/10C04B24/38C04B103/44
CPCC08F251/00C04B24/38C04B2103/44
Inventor 黄国雄钱珊珊丁蓓仇影王高明郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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