Slow-release mud-resistant polycarboxylate superplasticizer and preparation method and application thereof

An anti-mud type, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems that the anti-mud performance of the polycarboxylate water reducer cannot be satisfied, the slump retention performance of the polycarboxylate water reducer is not good enough, etc. slump time, molecular structure stability, and the effect of improving slump retention performance

Pending Publication Date: 2022-02-08
武汉三源特种建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrolysis rate of the hydroxyethyl acrylate used in this patent application is relatively fast in the cement hydration process, and it is completely hydrolyzed after two hours of cement hydration, which makes the slump retention performance of the polycarboxylate superplasticizer not good enough; and its The anti-mud performance of the prepared polycarboxylate superplasticizer can not meet the needs of practical applications

Method used

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  • Slow-release mud-resistant polycarboxylate superplasticizer and preparation method and application thereof
  • Slow-release mud-resistant polycarboxylate superplasticizer and preparation method and application thereof
  • Slow-release mud-resistant polycarboxylate superplasticizer and preparation method and application thereof

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Embodiment 1

[0030] The slow-release anti-mud type polycarboxylate superplasticizer provided in this embodiment includes the following raw materials in parts by weight:

[0031] 350 parts of 4-hydroxybutyl vinyl polyoxyethylene ether, 52.5 parts of acrylic acid, 8 parts of dimethyl diallyl ammonium chloride, and 38 parts of isooctyl acrylate.

[0032] The preparation method of described slow-release anti-mud type polycarboxylate superplasticizer comprises the following steps:

[0033]S1. Add 350 parts of 4-hydroxybutyl vinyl polyoxyethylene ether (molecular weight: 3000) to 300 parts of water, stir evenly to obtain material liquid A; add 0.6 parts of reducing agent E-51 and 0.8 parts of mercaptoethanol to 75 8 parts of dimethyl diallyl ammonium chloride, 38 parts of isooctyl acrylate, and 52.5 parts of acrylic acid were added to 20 parts of water, and stirred evenly to obtain material liquid C;

[0034] S2. At 10-20°C, add the feed liquid A into the reaction vessel, and add 5 parts of hyd...

Embodiment 2

[0038] The slow-release anti-mud type polycarboxylate superplasticizer provided in this embodiment includes the following raw materials in parts by weight:

[0039] 380 parts of 4-hydroxybutyl vinyl polyoxyethylene ether, 58 parts of acrylic acid, 10 parts of acryloyloxyethyltrimethylammonium chloride, and 45 parts of stearyl acrylate.

[0040] The preparation method of described slow-release anti-mud type polycarboxylate superplasticizer comprises the following steps:

[0041] S1. Add 380 parts of 4-hydroxybutyl vinyl polyoxyethylene ether (molecular weight: 3000) to 300 parts of water, stir evenly to obtain material liquid A; add 0.8 parts of sodium formaldehyde sulfoxylate and 1.0 parts of mercaptoethanol to 75 10 parts of acryloyloxyethyltrimethylammonium chloride, 45 parts of stearyl acrylate, and 58 parts of acrylic acid were added to 20 parts of water, and stirred evenly to obtain material liquid C;

[0042] S2. At 10-20°C, add the feed liquid A into the reaction vesse...

Embodiment 3

[0046] The slow-release anti-mud type polycarboxylate superplasticizer provided in this embodiment includes the following raw materials in parts by weight:

[0047] 355 parts of 4-hydroxybutyl vinyl polyoxyethylene ether, 60 parts of acrylic acid, 6 parts of dimethyl diallyl ammonium chloride, 6 parts of acryloyloxyethyl trimethyl ammonium chloride, 8 parts of isooctyl acrylate Parts, 32 parts of stearyl acrylate.

[0048] The preparation method of described slow-release anti-mud type polycarboxylate superplasticizer comprises the following steps:

[0049] S1. Add 355 parts of 4-hydroxybutyl vinyl polyoxyethylene ether (molecular weight: 3000) to 300 parts of water, stir evenly to obtain material liquid A; add 0.8 parts of sodium formaldehyde sulfoxylate and 1.0 parts of thioglycolic acid to 75 6 parts of dimethyl diallyl ammonium chloride, 6 parts of acryloyloxyethyl trimethyl ammonium chloride, 8 parts of isooctyl acrylate, 32 parts of octadecyl acrylate Add ester and 60 p...

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Abstract

The invention provides a slow-release mud-resistant polycarboxylate superplasticizer and a preparation method and application thereof, and belongs to the technical field of concrete admixtures. The slow-release mud-resistant polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight: 350 to 380 parts of 4-hydroxybutyl vinyl polyoxyethylene ether, 51 to 60 parts of acrylic acid, 8 to 12 parts of cationic monomer and 35 to 45 parts of unsaturated ester. The method comprises the following steps: adding an oxidizing agent into a polyether monomer solution; simultaneously dropwise adding a feed liquid B prepared by adding a reducing agent and a chain transfer agent into water and a feed liquid C prepared by adding a cationic monomer, unsaturated esters and acrylic acid into water, and ensuring that the feed liquid C is completely dropwise added before the feed liquid B; and finally, carrying out heat preservation reaction to obtain the slow-release mud-resistant polycarboxylate superplasticizer. The slow-release mud-resistant polycarboxylate superplasticizer prepared by the preparation method has good mud resistance and slump loss resistance at the same time.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a slow-release mud-resistant polycarboxylate water reducer and its preparation method and application. Background technique [0002] Polycarboxylate superplasticizer is the third-generation high-efficiency concrete additive after lignosulfonate and naphthalene-based superplasticizers. It has the characteristics of simple operation, easy construction, environmental protection and reliability. In the synthesis process of polycarboxylate superplasticizer, polyether macromonomer plays an important role, from the early allyl alcohol polyoxyethylene ether (APEG), polyethylene glycol monomethyl ether (MPEG) to the widely used With the continuous improvement of the production process of polyether macromonomers, the reactivity of new monomers has been continuously improved. In recent years, the six-carbon polyether monomers ethylene glycol monovinyl polyglycol ether (EPEG) an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F226/04C08F220/18C08F220/34C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F226/04C08F220/1808C08F220/34C08F220/1818
Inventor 文轩汪源李伟鹏胡志豪
Owner 武汉三源特种建材有限责任公司
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