Polycarboxylate superplasticizer and preparation method and application thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent and its preparation, can solve the problems of fluidity, poor slump retention, and unsatisfactory application, so as to improve slump retention performance and enhance slump retention performance , Improve the effect of dispersion

Active Publication Date: 2020-03-20
佳化化学(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problems such as fluidity and poor slump retention in the polycarboxylate water reducer in the prior art, and cannot meet the defects of application in concrete containing inferior sandstone materials, thereby Provide a kind of polycarboxylate superplasticizer and its preparation method and application

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  • Polycarboxylate superplasticizer and preparation method and application thereof
  • Polycarboxylate superplasticizer and preparation method and application thereof

Examples

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Embodiment 1

[0044] This embodiment provides a polycarboxylate water reducer and its preparation method, specifically comprising the following steps:

[0045] Preparation of Solution A: Dissolve 100kg of acrylic acid, 100kg of methacrylic acid, 5kg of hydroxypropyl acrylate, and 5kg of hydroxyethyl acrylate in 800L of water, mix well, and set aside;

[0046] Preparation of Solution B: Dissolve 1.5kgL-ascorbic acid, 1.5kg sodium formaldehyde sulfoxylate, 4kg mercaptoethanol, 4kg mercaptopropionic acid in 1000L water, mix well, and set aside;

[0047] Preparation of solution C: 0.01kg ferrous sulfate and 500kg VOPEG (number average molecular weight is 400), dissolved in 400L water, mixed evenly, set aside;

[0048] Preparation of Solution D: Dissolve 1000kg TPEG (number average molecular weight: 2400), 30kg hydrogen peroxide in 1000L water, mix well, and set aside;

[0049] Add solution D to the reaction kettle, and then add solution B dropwise at 20°C under stirring. When solution B is add...

Embodiment 2

[0051] This embodiment provides a polycarboxylate water reducer and its preparation method, specifically comprising the following steps:

[0052] Preparation of solution A: 20kg of acrylic acid, 5kg of methacrylic acid, 15kg of hydroxypropyl acrylate, and 15kg of monoethyl maleate were dissolved in 500L of water, mixed evenly, and set aside;

[0053] Preparation of solution B: dissolve 3kgL-ascorbic acid, 4kg sodium formaldehyde sulfoxylate, 2.5kg mercaptoethanol, and 2.5kg mercaptopropionic acid in 900L of water, mix well, and set aside;

[0054] The preparation of solution C: 0.08kg ferrous chloride, 100kg VOPEG (the number average molecular weight is 1000), dissolve in 500L water, mix well, set aside;

[0055] Preparation of Solution D: Dissolve 1000kg TPEG (number average molecular weight: 2000), 10kg hydrogen peroxide in 900L water, mix well, and set aside;

[0056] Add solution D to the reaction kettle, and then add solution B dropwise at 20°C under stirring. When solut...

Embodiment 3

[0058] This embodiment provides a polycarboxylate water reducer and its preparation method, specifically comprising the following steps:

[0059] Preparation of Solution A: Dissolve 200kg of acrylic acid, 100kg of itaconic acid, 30kg of hydroxypropyl acrylate, and 30kg of hydroxyethyl acrylate in 600L of water, mix well, and set aside;

[0060] Preparation of solution B: dissolve 3kgL-ascorbic acid, 2kg sodium formaldehyde sulfoxylate, 5kg mercaptoethanol, and 5kg mercaptopropionic acid in 800L of water, mix well, and set aside;

[0061] Preparation of solution C: 0.1kg ferrous acetate, 1000kg VOPEG (number average molecular weight is 2000), dissolved in 800L water, mixed evenly, set aside;

[0062] Preparation of Solution D: Dissolve 1000kg TPEG (number average molecular weight: 3000), 20kg hydrogen peroxide in 800L water, mix well, and set aside;

[0063] Add solution D to the reaction kettle, and then add solution B dropwise at 20°C under stirring. When solution B is added...

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Abstract

The invention provides a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer comprises the following raw materials: TPEG, VOPEG, a reducing agent, achain transfer agent, unsaturated carboxylic acid, unsaturated carboxylic ester, an initiator and a Fe<2+> compound, wherein the VOPEG is hydroxybutyl vinyl polyoxyethylene ether, and the TPEG is isopentenol polyoxyethylene ether. With the above raw material components, the prepared polycarboxylate superplasticizer has an alkane main chain with a carboxylic acid group and a carboxylic ester groupand a hydrophilic polyether side chain comb-shaped molecular structure; the activity matching degree of VOPEG, unsaturated carboxylic acid and unsaturated carboxylic ester is better, so the monomer content of VOPEG in the molecular main chain is effectively increased; and the contents of other monomers in the molecular main chain are adjusted, so the polycarboxylate superplasticizer has very gooddispersity and slump loss resistance, the consistency of concrete can be reduced, and the requirements on application of the polycarboxylate superplasticizer in concrete containing inferior gravel materials can be met.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a polycarboxylate water reducer and its preparation method and application. Background technique [0002] In recent years, with the rapid development of the construction industry, concrete has become the most used building material at present. Concrete admixtures are the fifth component of concrete except cement, sand, stone and water. In the application of high performance concrete plays a very important role. [0003] As a kind of concrete admixture, the water reducer is mainly used to hinder or destroy the flocculation structure of cement particles through surface activity, complexation, electrostatic repulsion or three-dimensional repulsion, thereby greatly improving the concrete. Sex and fluidity, in order to save the amount of cement, reduce the water consumption of concrete mixing, and improve the strength of concrete. Therefore, with the development of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/02C08F222/16C04B24/26C04B103/30
CPCC08F283/065C04B24/2647C04B24/267C04B24/2694C04B2103/302C08F220/06C08F220/20C08F222/16C08F222/02
Inventor 李亚杰何新耀刘东亚李玉博
Owner 佳化化学(上海)有限公司
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