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Small-molecule polymer for reducing viscosity of high-grade concrete and preparation method of small-molecule polymer

A technology of concrete and small molecules, applied in the field of concrete, can solve the problems of diversification of sand and gravel sources, tight supply of high-quality raw materials, high impurity content, etc.

Active Publication Date: 2021-06-08
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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  • Small-molecule polymer for reducing viscosity of high-grade concrete and preparation method of small-molecule polymer
  • Small-molecule polymer for reducing viscosity of high-grade concrete and preparation method of small-molecule polymer
  • Small-molecule polymer for reducing viscosity of high-grade concrete and preparation method of small-molecule polymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0038] 4-vinylphenol: 25 parts

[0039] Trans-2.3-epoxybutane: 300 parts

[0040] Acetyl methanesulfonic acid: 13 parts

[0041] Lithium aluminum hydride: 0.10 parts

[0042] Potassium hydroxide: 0.11 parts

[0043] Acrylic: 50 parts

[0044] Ammonium persulfate: 2.2 parts

[0045] Ascorbic acid: 4.5 parts

[0046] Mercaptopropionic acid and mercaptoacetic acid with a mass ratio of 1:2: 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 intermediate

[0051] (1.1) Add 25 parts of 4-vinylphenol into the autoclave, add 0.10 parts of lithium aluminum tetrahydrogen, and then, under stirring, perform nitrogen replacement 4 times, t...

Embodiment 2-6

[0060] Concrete parameters (steps are the same) in concrete raw material and preparation method are different from embodiment 1, specifically as shown in following table 1 and table 2 (table 1 is raw material, and table 2 is the parameter in preparation method), in table 2 Not listed expression is identical with embodiment 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 small material 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 American Brookfield Company. Gas 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 viscosity-re...

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Abstract

The invention provides a small-molecular polymer for reducing viscosity of high-grade concrete and a preparation method of the small-molecular polymer. The polymer is mainly prepared from the following materials: 25 to 30 parts of a phenolic monomer, 220 to 340 parts of an epoxide, 11 to 16 parts of a sulfonic acid monomer, 0.08 to 0.20 part of a catalyst a, 0.10 to 0.12 part of a catalyst b, 40 to 55 parts of an acid small monomer, 0.9 to 3.0 parts of an oxidizing agent, 3.4 to 5.8 parts of a reducing agent, 0.8 to 2.2 parts of a chain transfer agent, 4.6 to 8.5 parts of a neutralizing agent and the balance of deionized water. A benzene ring-containing unsaturated intermediate with molecular mass of about 600 is synthesized and is further regulated and controlled by an initiator and a chain transfer agent under a constant-temperature condition with an acid small monomer with a certain molar mass ratio, and the small-molecule polymer with a narrow molecular weight distribution range is prepared.

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 molecular 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 getting higher and higher. Polycarboxylate polymer is one of the five indispensable components of high-performance concrete. Polycarboxylate polymer has a terminal double bond structure Polyether macromonomers and small molecular monomers are copolymerized to form high molecular copolymers, known as the third generation concrete superplasticizer. The polycarboxylate slump-retaining agent containing polyether side chains should have the advantages of green environmental protection, high slump-prevention, large degree of freedom in cement adaptability to wide molecular structure, and significant effec...

Claims

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Application Information

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Patent Type & Authority Applications(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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