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A kind of small molecular polymer for reducing the viscosity of high-grade concrete and its preparation method

A concrete and small molecule technology, applied in the field of concrete, can solve the problems of diversification of sand and gravel sources, high-quality raw material supply shortage, high impurity content, etc., and achieve the effect of uniform polymer molecular weight distribution, simple synthesis process, and less by-products

Active Publication Date: 2022-06-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid growth of the demand for concrete, there are great regional differences in cement, fly ash and other cementitious materials, the main raw materials of concrete, the diversification of sand and gravel sources, the tight supply of high-quality raw materials, and the high content of impurities.

Method used

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  • A kind of small molecular polymer for reducing the viscosity of high-grade concrete and its preparation method
  • A kind of small molecular polymer for reducing the viscosity of high-grade concrete and its preparation method
  • A kind of small molecular polymer for reducing the viscosity of high-grade concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The total mass fraction of the raw materials for preparing the small molecule polymer is 1000 parts, each mass fraction in this embodiment is 1 g, and the mass fractions of each raw material component are as follows:

[0038] 4-Vinylphenol: 25 parts

[0039] Trans-2.3-butylene oxide: 300 parts

[0040] Acetomethanesulfonic acid: 13 parts

[0041] Lithium aluminum tetrahydrogen: 0.10 parts

[0042] Potassium hydroxide: 0.11 parts

[0043] Acrylic: 50 parts

[0044] Ammonium persulfate: 2.2 parts

[0045] Ascorbic acid: 4.5 servings

[0046] 1:2 mercaptopropionic acid and thioglycolic acid: 1.2 parts

[0047] Sodium hydroxide: 5.4 parts

[0048] The rest is deionized water.

[0049] The preparation method is as follows:

[0050] (1) Preparation of unsaturated intermediates

[0051] (1.1) add 25 parts of 4-vinyl phenol in the autoclave, add 0.10 part of lithium aluminum tetrahydrogen, then under stirring, carry out nitrogen replacement 4 times, turn on the heatin...

Embodiment 2-6

[0060] The specific parameters (the steps are the same) in the specific raw materials and the preparation method are different from those in Example 1, as shown in Table 1 and Table 2 below (Table 1 is the raw material, and Table 2 is the parameter in the preparation method), in Table 2 Those not listed are the same as in Example 1:

[0061] Table 1

[0062]

[0063]

[0064] Table 2

[0065]

[0066]

[0067] The product of the present invention and Qingdao Dingchang ZN-2017-A concrete batch are made into C50 concrete samples, and the following table is obtained after testing. (Dosage 0.3wt%) (Viscosity is tested by R / S-SST2000 Soft Solid Rheometer manufactured by Brookfield Company in the United States. Air content is tested according to the standard of GB / T50080-2002.)

[0068] table 3

[0069]

[0070] Through the comparative analysis of the test data in the above table, it can be clearly seen that the polymer prepared by the present invention has good vi...

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Abstract

The invention provides a small molecular polymer for reducing the viscosity of high-grade concrete and a preparation method thereof. The polymer is mainly prepared from the following materials: 25-30 parts of phenolic monomers, 220-340 parts of epoxides, 11-16 parts of sulfonic acid monomers, 0.08-0.20 parts of catalyst a, and 0.10 parts of catalyst b -0.12 parts, 40-55 parts of small acid monomers, 0.9-3.0 parts of oxidizing agent, 3.4-5.8 parts of reducing agent, 0.8-2.2 parts of chain transfer agent, 4.6-8.5 parts of neutralizing agent, and the rest is deionized water. By synthesizing an unsaturated intermediate with a benzene ring with a molecular mass of about 600, and further mixing it with a small acid monomer with a certain molar mass ratio under constant temperature conditions, through the regulation of an initiator and a chain transfer agent, a narrow molecular weight distribution range is prepared. small molecule polymers.

Description

technical field [0001] The invention belongs to the technical field of concrete, and relates to the field of polymers with benzene rings, in particular to a small-molecule polymer for viscosity reduction of high-grade concrete and a preparation method thereof. Background technique [0002] With the development of modern industry, the quality requirements of concrete buildings are also getting higher and higher. Polycarboxylic acid polymer is one of the five indispensable components of high performance concrete. Polyether macromonomers and small molecular monomers are copolymerized to form macromolecular copolymers, which are known as the third-generation concrete superplasticizers. The polycarboxylate slump-retaining agent containing polyether side chains should have the advantages of green environmental protection, high slump retention, cement adaptability to wide molecular structure, large degree of freedom, and significant reinforcement effect on concrete, and has been su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/30C04B24/16
CPCC08F283/065C04B24/166C08F220/06C08F220/303Y02W30/91
Inventor 李相国冷迪飞吕阳蹇守卫柯凯刘卓霖
Owner WUHAN UNIV OF TECH
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