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Polycarboxylate water reducer

A technology of water reducer and polycarboxylate, which is applied in the field of polycarboxylate water reducer, can solve the problems of low conversion rate of raw materials, influence of water reducer performance, cumbersome production process, etc., and achieve good batch stability, concrete and Good workability and uniform molecular weight distribution

Pending Publication Date: 2020-05-15
YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process of MAA-MPEG is cumbersome, the energy consumption is high, the conversion rate of raw materials is low, and the residual part is easy to affect the performance of the prepared water reducer.

Method used

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  • Polycarboxylate water reducer
  • Polycarboxylate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Put 100.00 parts of HPEG monomer with a molecular weight of 2400, 3 parts of a special ester macromonomer with a molecular weight of 1000 and 80 parts of water into a reaction vessel, heat up, stir to completely dissolve the reactants, heat up to 30°C, and add hydrogen peroxide 1.9 parts, drop 14 parts of acrylic acid and 5 parts of water mixed solution A, 1.2 parts of vitamin C, 0.4 parts of mercaptoethanol and 17 parts of water mixed solution B, where A solution is dripped at 210±20min, B mixed solution at 180 ±20min to finish dripping. After the dropwise addition, stir and keep warm for 1 hour, add 40 parts of water, cool down to below 30°C, adjust the pH value to 6.5 with sodium hydroxide, and obtain super early strength polycarboxylate high-performance concrete superplasticizer PC-1.

Embodiment 2

[0048] Put 100.00 parts of HPEG monomer with a molecular weight of 2400, 5 parts of a special ester macromonomer with a molecular weight of 1000 and 80 parts of water into a reaction vessel, heat up, stir to completely dissolve the reactants, heat up to 30°C, and add hydrogen peroxide 1.9 parts, drop 14 parts of acrylic acid and 5 parts of water mixed solution A, 1.2 parts of vitamin C, 0.4 parts of mercaptoethanol and 17 parts of water mixed solution B, where A solution is dripped at 210±20min, B mixed solution at 180 ±20min to finish dripping. After the dropwise addition, stir and keep warm for 1 hour, add 40 parts of water, cool down to below 30°C, adjust the pH value to 6.5 with sodium hydroxide, and obtain super early strength polycarboxylate high-performance concrete water reducer PC-2.

Embodiment 3

[0050] Put 100.00 parts of HPEG monomer with a molecular weight of 2400, 7 parts of special ester macromonomer with a molecular weight of 1000 and 80 parts of water into a reaction vessel, heat up, stir to completely dissolve the reactants, heat up to 30°C, and add hydrogen peroxide 1.9 parts, drop 12 parts of acrylic acid and 5 parts of water mixed solution A, 1.2 parts of vitamin C, 0.4 parts of mercaptoethanol and 17 parts of water mixed solution B, where A solution is dripped at 210±20min, B mixed solution at 180 ±20min to finish dripping. After the dropwise addition, stir and keep warm for 1 hour, add 40 parts of water, cool down to below 30°C, adjust the pH value to 6.5 with sodium hydroxide, and obtain super early strength polycarboxylate high-performance concrete water reducer PC-3.

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Abstract

The invention discloses a polycarboxylate water reducer. The polycarboxylate water reducer is prepared by a method comprising the following steps: 1) mixing modified polyether, a special ester macro-monomer and water to obtain a first aqueous solution; 2) adding an oxidizing agent into the first aqueous solution, and dropwise adding a second aqueous solution and a third aqueous solution at the same time at the temperature of 20-70 DEG C; and 3) after the second aqueous solution and the third aqueous solution are completely added, stirring, controlling the temperature of the system to be 0-30 DEG C and not to be 0 DEG C, adding water, and adjusting the pH value of the system to be 6.5 + / -1.0 to obtain the polycarboxylate water reducer with the solid content of 40wt%-50wt%. The polycarboxylate water reducer has the advantages of low sensitivity to mixing amount, good slump loss resistance, good adaptability, especially good concrete workability, easy control of preparation conditions, simple operation, high application / cost performance, and realization of mass production.

Description

technical field [0001] The invention belongs to the field of water reducers, and more specifically relates to a polycarboxylate water reducer. Background technique [0002] In recent years, various infrastructure projects (subway, high-speed rail, residential buildings, highways, etc.) have increased rapidly. However, due to the poor quality and unevenness of materials such as sand and gravel, concrete is prone to collapse and damage for a while, and segregation and bleeding for a while. The sensitivity of the dosage and ground materials is too obvious, which has caused many troubles for concrete production enterprises: the control of concrete production and on-site construction is low and difficult, and the risk of concrete and construction quality is high. [0003] Prior art CN 201780027255.9 discloses a preparation method of low-sensitivity polycarboxylate water-reducer, the technical solution is through photoinitiator under irradiation of unsaturated ester macromonomer a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F4/40C08F2/38C04B24/26C04B103/30
CPCC08F283/065C08F283/06C04B24/2694C04B2103/302
Inventor 杨晓峰
Owner YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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