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Amide type polycarboxylic acid type water reducer, and preparation method and using method thereof

A technology similar to polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of cost increase, achieve good water reducing rate, simple preparation process, and good slump retention effect

Inactive Publication Date: 2019-03-29
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research shows that the side effects of aggregate mud content on concrete can be improved through compounding technology, but compounding to solve the problem of aggregate mud content will not only bring about a significant increase in cost, but also cause relative interactions between organic and inorganic components. Capacitance, storage stability and other issues

Method used

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  • Amide type polycarboxylic acid type water reducer, and preparation method and using method thereof
  • Amide type polycarboxylic acid type water reducer, and preparation method and using method thereof
  • Amide type polycarboxylic acid type water reducer, and preparation method and using method thereof

Examples

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preparation example Construction

[0046] In a specific embodiment, the present application also provides the preparation method of the amide polycarboxylate water reducer, which includes the following steps: adding sodium hypophosphite to the first mixture under stirring conditions, and then Add the first solution and the second solution dropwise to carry out the polymerization reaction, adjust the pH value of the reaction solution to 5.5-7.5 with sodium hydroxide, and then adjust the solid content to 40wt%-50wt% with water, which is the amide polycarboxylic acid system water reducer;

[0047] The first mixture is obtained by mixing polyetheramine, polyacrylic acid and water;

[0048] The first solution is composed of N-carbamoyl maleic acid, sodium methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, butyl acrylate, methyl methacrylate and water mixed to get;

[0049] The second solution is obtained by mixing ammonium persulfate, di-tert-butyl peroxide and water.

[0050] Preferably, the pr...

Embodiment 1

[0071] (1) Preparation before polymerization:

[0072] Preparation of the first mixture: 100 parts by weight of polyetheramine, 100 parts by weight of polyacrylic acid and 250 parts by weight of water are put into a polymerization reactor, stirred evenly, and the temperature is kept at 60°C for later use;

[0073] Preparation of the first solution: Weigh 10 parts by weight of N-carbamoyl maleic acid, 20 parts by weight of sodium methacrylate, 20 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, 12 parts by weight Acrylamide, 20 parts by weight of butyl acrylate, 20 parts by weight of methyl methacrylate and 100 parts by weight of water, stirred evenly, prepared dropwise;

[0074] Preparation of the second solution: 10 parts of ammonium persulfate, 2 parts by weight of di-tert-butyl peroxide and 70 parts by weight of water, stirred evenly, ready to add dropwise;

[0075] (2) Polymerization: In step (1), the polymerization reactor that has been put into the first mi...

Embodiment 2～5

[0079] The preparation methods of Examples 2-5 are the same as those of Example 1, and the differences are specifically marked in Table 1 below. Effect Example 1

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Abstract

The invention relates to an amide type polycarboxylic acid water reducer. The water reducer is prepared from, by weight, polyetheramine, polyacrylic acid, a small molecule monomer, an oxidizing agent,a reducing agent, a pH adjuster and water. The invention also relates to a preparation method and a using method of the amide type polycarboxylic acid water reducer, and an application of the water reducer in the construction engineering of concrete with high-cement aggregate. The amide type polycarboxylic acid water reducer has the advantages of simple preparation process, and good water-reducing rate and slump-retaining effect in high-cement aggregates.

Description

technical field [0001] This application relates to the technical field of building materials, in particular to an amide polycarboxylate water reducer, a method for preparing the amide polycarboxylate water reducer, a method for using the amide polycarboxylate water reducer and Its application in construction engineering. Background technique [0002] Polycarboxylate superplasticizers are more and more widely used in high-performance concrete because of their excellent properties such as high water reducing rate, high slump retention, high reinforcement and high durability. However, a large number of studies and engineering examples show that, compared with naphthalene-based water-reducers and sulfamic acid-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates. When the amount of mud is high, the water-reducing and dispersing ability of the water-reducing agent is seriously reduced, and the slump-preserving effect bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F265/02C08F228/02C08F220/58C08F220/56C08F220/18C08F220/14C08F222/38C04B24/16C04B103/30
CPCC04B24/163C04B24/165C08F265/02C08F283/06C04B2103/302C08F220/585C08F220/1804
Inventor 罗琼翟立杰刘洪锦季锦卫章鹏飞
Owner SHANGHAI DONGDA CHEM