Amphoteric polycarboxylate superplasticizer and preparation method thereof

A technology of amphoteric polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer for cement concrete. The effect of low temperature and low energy consumption

Active Publication Date: 2020-05-19
四川金江建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the defect that the amide type polycarboxylate water reducer in the prior art cannot improve the dispersibility, fluidity and retarding effect at the same time, and to provide an amphoteric amide type polycarboxylate water reducer, which The water reducer is prepared by introducing the repeating unit structure of diacetone acrylamide and phenyl ether amide into the raw material to prepare an amphoteric polycarboxylate water reducer. This amphoteric water reducer can keep the molecular conformation of the copolymer stretched, Increase the adsorption points on cement and superplasticizers, improve the effective adsorption of superplasticizers on the surface of positively and negatively charged minerals, not only maintain the dispersion and fluidity of polycarboxylate superplasticizers, but also effectively improve the retardation Effect; the preparation method of the amphoteric polycarboxylate water reducer is simple and easy to operate

Method used

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  • Amphoteric polycarboxylate superplasticizer and preparation method thereof
  • Amphoteric polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of acrylamide monomer containing phenyl ether:

[0035] Add 30 parts of organic solvent dichloromethane, 10 parts of 4,4'-diaminodiphenyl ether, 5 parts of acid-binding agent triethylamine into the reaction kettle, stir well, and cool the mixture to 0°C; add 4.5 parts of propylene The mixed solution of acid chloride and 10 parts of dichloromethane was added dropwise to the reactor, and the reaction was continued at constant temperature for 4 h; with 10 parts of saturated NaHCO 3 Wash the solution in the reaction kettle for 3 times, separate the liquid to obtain the inorganic phase, filter, evaporate the solvent, and separate the residue with an ethyl acetate / petroleum ether (V / V=1 / 5) column to obtain a white acrylamide monomer containing phenyl ether .

[0036] Preparation of amphoteric polycarboxylate superplasticizer:

[0037] Add M to the reactor w=2400g / mol, 100 parts of isopentenol polyoxyethylene ether with a hydroxyl value of 21-26mgKOH / g, 5 parts ...

Embodiment 2

[0039] The rest is the same as in Example 1, except that the amount of acrylamide monomer containing phenylene ether is 5 parts, and that of diacetone acrylamide is 3 parts.

Embodiment 3

[0041] The rest is the same as in Example 1, except that the amount of phenylene ether-containing acrylamide monomer is 8 parts, and the amount of diacetone acrylamide is 3 parts.

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Abstract

The invention provides an amphoteric polycarboxylate superplasticizer and a preparation method thereof. The superplasticizer comprises an unsaturated polyether macromonomer, an acrylamide monomer containing phenylate, diacetone acrylamide, (methyl) acrylic acid, (methyl) propylene sulfonate, an initiator, a reducing agent and a chain transfer agent. The acrylamide monomer containing phenylate is obtained by carrying out amidation reaction on acryloyl chloride and aminophenyl ether, and each benzene ring in the aminophenyl ether structure is provided with at least one amino group. The superplasticizer comprises a long side chain formed by the unsaturated polyether macromonomer and a short side chain formed by other monomers, the long-chain and short-chain comb-shaped structure and functional group matched superplasticizer can give full play to the effect of functional groups to form yin-yang amphoteric property, embedding of the functional groups and entanglement between long side chains are avoided, and the retarding effect can be improved under the condition that dispersity and fluidity are not reduced. The superplasticizer is high in water reducing rate, good in slump loss resistance, simple in synthesis process, low in energy consumption, green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of polycarboxylate water reducer for cement concrete, and in particular relates to an amphoteric polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the third generation of superplasticizer. Due to its excellent performance, especially the ability to design and adjust the molecular structure according to the needs, it has been widely used in the production process of modern concrete. It has become the research focus and research hotspot in the field of water reducing agent. Polycarboxylate superplasticizer is composed of anionic adsorption groups and non-ionic polyethanol side chains, and has a comb structure. The main mechanism of action of this type of superplasticizer is the carboxyl group and sulfonic acid group in the molecular structure of the superplasticizer. Such anions are adsorbed on the surface of cement particles to f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/58C08F220/06C08F228/02C04B24/16C04B103/30
CPCC08F283/065C04B24/165C04B2103/302C08F220/58C08F220/06C08F228/02
Inventor 马清浩
Owner 四川金江建材科技有限公司
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