A method for preparing a cementitious material reducing admixture from a cationic polymer

A technology of cationic polymers and adhesive reducers, which is applied in the field of building materials, can solve the problems of limiting the large-scale application and promotion of adhesive reducers, limiting the development and application range of adhesive reducers, etc., and achieving avoidance of competitive adsorption, good designability, and improved The effect of dispersion power

Inactive Publication Date: 2019-02-26
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary glue reducers only rely on the dispersing ability brought about by electrostatic repulsion, which limits the development and application range of glue reducers to a certain extent. Large-scale application promotion

Method used

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  • A method for preparing a cementitious material reducing admixture from a cationic polymer
  • A method for preparing a cementitious material reducing admixture from a cationic polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 (each component consumption is parts by weight)

[0036] 1, the preparation of cationic polymer: the preparation method of cationic polymer is carried out as follows:

[0037] 1), 10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 6 parts of dimethyl-vinyl phosphate, 0.5 parts of acrylic anhydride, 7 parts of sodium hypophosphite monohydrate and 30 parts of water are added to the reaction In the kettle, stir to dissolve;

[0038] 2), measure the temperature in the kettle, control the temperature at 5°C, after the temperature is stable, add 2 parts of ammonium persulfate at one time;

[0039] 3), after adding ammonium persulfate for 5 minutes, start to drop solution A and solution B successively. After solution A is added, start to add solution B dropwise within 10 minutes. The time for adding solution B is 0.5 hours, and the time for adding solution A is 1 hour; solution A consisted of 1 part thioglycolic acid and 20 parts water, solution B consisted ...

Embodiment 2

[0042] Embodiment 2 (each component consumption is parts by weight)

[0043] 1, the preparation of cationic polymer: the preparation method of cationic polymer is carried out as follows:

[0044] 1), 11 parts of N-methyl-1-ethylene sulfonamide, 5.5 parts of ethylene glycol methacrylate phosphate, 1 part of decenyl succinic anhydride, 6.8 parts of sodium hypophosphite monohydrate and 25 parts of water Add to the reaction kettle, stir to dissolve;

[0045] 2), measure the temperature in the kettle, control the temperature at 8°C, after the temperature is stable, add 2.4 parts of ammonium persulfate at one time;

[0046] 3), after adding ammonium persulfate for 5 minutes, start to drop solution A and solution B successively. After solution A is added, start to add solution B dropwise within 10 minutes. The time for adding solution B is 1.3 hours, and the time for adding solution A is 1.8 hours; solution A consists of 1-4 parts of thioglycolic acid and 24 parts of water, solutio...

Embodiment 3

[0049] Embodiment 3 (each component consumption is parts by weight)

[0050] 1, the preparation of cationic polymer: the preparation method of cationic polymer is carried out as follows:

[0051] 1) Add 12 parts of N-methylolacrylamide, 4.8 parts of bistrimethylsilylated vinyl phosphate, 2 parts of crotonic anhydride, 6.4 parts of sodium hypophosphite monohydrate and 22 parts of water into the reactor in, stir to dissolve;

[0052] 2), measure the temperature in the kettle, control the temperature at 12°C, after the temperature is stable, add 2.8 parts of ammonium persulfate at one time;

[0053] 3), after adding ammonium persulfate for 5 minutes, start to drop solution A and solution B successively. After solution A is added, start to add solution B dropwise within 10 minutes. The time for adding solution B is 1.7 hours, and the time for adding solution A is 2.2 hours; solution A consists of 2 parts of thioglycolic acid and 28 parts of water, solution B consists of 7 parts ...

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Abstract

A method for preparing a cementitious material reducing admixture from a cationic polymer is provided. The admixture is prepared from, by weight, 10-20 parts of an alcohol amine compound, 1-5 parts oforganic polyol, 10-25 parts of the cationic polymer, and 0.05-0.1 part of a lubricant, with the balance being water. The admixture is prepared by adding the components into a reactor, and fully stirring the materials for 0.5 h. The cementitious material reducing admixture is prepared by a manner of polymerizing a small cationic monomer to obtain the cationic polymer having a high molecular weight. The cationic polymer has good structure designability and synergistic effect and matches with a water reducing agent well, so that the dosage of a cementitious material can be significantly reduced,and dispersibility, water retention performance and long-term strength of concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing a glue reducer from a cationic polymer. Background technique [0002] As a new generation of concrete admixture, concrete reducer can better improve the workability of concrete and reduce the amount of cementitious materials in concrete. When used together with water reducer, reducer can better play its role in reducing glue. performance. The study found that cement particles are mainly composed of four major mineral components, specifically tricalcium aluminate, tricalcium silicate, dicalcium silicate, and tetracalcium aluminoferrite. These four minerals have different positive and negative charges. The resulting hydration products, cement particles combine with a large number of water molecules to form a large number of flocculation structures. The water reducer can open part of the flocculation structure and improve the fluidity of the mixtu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F230/02C08F220/34C08F220/30C04B24/26
CPCC04B24/243C04B24/2688C08F220/58C08F220/585C08F230/02C08F220/34C08F220/302
Inventor 柯凯罗正权严明陈艳林熊焰
Owner HUBEI UNIV OF TECH
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