Ester slump retaining type polycarboxylate water reducer and preparation method thereof

A slump-preserving, polycarboxylic acid technology, which is applied in the field of building materials, can solve the problems of excessive slump loss, prolonged setting time, and high cost of slump-preserving agents, and achieves improved dispersing ability, increased steric hindrance effect, and improved slump retention. good for dispersion

Active Publication Date: 2014-12-24
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as changes in cement, mud content in sand and stone materials, polycarboxylate superplasticizers also have problems such as excessive slump loss and poor workability in practical applications.
However, because the dispersibility and slump retention of polycarboxylate superplasticizers are contradictory, usually only one kind of mother liquor has better performance. In order to solve this problem, the industry generally uses high water-reducing polycarboxylate The method of compounding slump-retaining agent and retarder in acid water reducing agent can improve the slump-retaining ability of concrete. The disadvantage of this method is that it is prone to problems such as high cost of slump-retaining agent and excessive prolongation of setting time.

Method used

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  • Ester slump retaining type polycarboxylate water reducer and preparation method thereof
  • Ester slump retaining type polycarboxylate water reducer and preparation method thereof
  • Ester slump retaining type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of the esterified macromonomer: polyethylene glycol monomethyl ether, triethylene glycol, methyl methacrylate, n-butyl titanate and mixed polymerization inhibitor with a molecular weight of 600 at 100 : 2:27:1:0.6 mass ratio, mix well, add to the reactor equipped with condensing device, under nitrogen atmosphere, react at constant temperature at 80°C for 6 hours, cool down to 50°C after the reaction, add 32.4 parts of water Adjust the concentration to 80% to obtain the esterified macromonomer solution, the solute polyethylene glycol monomethyl ether methacrylate, the crosslinking monomer triethylene glycol bismethyl The mixture of base acrylate and methyl methacrylate; The mixed polymerization inhibitor is a mixture of hydroquinone and hydroquinone monomethyl ether, and the mass ratio of the two is 2:1;

[0035] (2) Take by weighing 100 parts by weight of esterified macromer solution, 2 parts by weight of methacrylic acid, 3 parts by weight of hydroxypro...

Embodiment 2

[0043] (1) Preparation of the esterified macromonomer: polyethylene glycol monomethyl ether, triethylene glycol, methyl methacrylate, 4-dimethylaminopyridine and mixed polymerization inhibitor with a molecular weight of 1200 The mass ratio of 100:0.5:17.5:0.2:0.3 was mixed evenly, added to the reactor equipped with a condensing device, and reacted at a constant temperature of 70°C for 5 hours under a nitrogen atmosphere. After the reaction was completed, the temperature was lowered to 50°C, and 29.6 parts of Adjust the concentration to 80% with water to obtain the esterified macromonomer solution, the solute polyethylene glycol monomethyl ether methacrylate, the crosslinking monomer triethylene glycol bis A mixture of methacrylate and methyl methacrylate; the mixed polymerization inhibitor is a mixture of hydroquinone and hydroquinone monomethyl ether, and the mass ratio of the two is 2:1;

[0044] (2) Weigh 100 parts by weight of esterified monomer solution, 3 parts by weight...

Embodiment 3

[0052] (1) Preparation of the esterified macromonomer: polyethylene glycol monomethyl ether, triethylene glycol, methyl methacrylate, dibutyltin oxide and mixed polymerization inhibitor with a molecular weight of 2000 at 100 The mass ratio of :1:17:1.5:0.4 is mixed evenly, added to the reactor equipped with a condensing device, and reacted at a constant temperature of 90°C for 5 hours under a nitrogen atmosphere. After the reaction is completed, the temperature is lowered to 50°C, and 29.6 parts of water are added. Adjust the concentration to 80% to obtain the esterified macromonomer solution, the solute polyethylene glycol monomethyl ether methacrylate, the crosslinking monomer triethylene glycol bismethyl The mixture of base acrylate and methyl methacrylate; The mixed polymerization inhibitor is a mixture of hydroquinone and hydroquinone monomethyl ether, and the mass ratio of the two is 2:1;

[0053] (2) Weigh 100 parts by weight of esterified monomer solution, 6 parts by w...

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Abstract

The invention discloses an ester slump retaining type polycarboxylate water reducer and a preparation method thereof. The ester slump retaining type polycarboxylate water reducer is made from raw materials comprising the following components in parts by weight: 100 parts of esterified macromer solution by weight, 2-6 parts of unsaturated monomer by weight, 1.5-4 parts of unsaturated phosphate by weight, 1-4 parts of an oxidizing agent by weight, 0.9-3.5 parts of a reducing agent by weight, 1-3 parts of a chain transfer agent by weight, 108 parts of water by weight, and 20 parts of industrial sodium hydroxide solution by weight, wherein the concentration of the esterified macromer solution is 75-85%, and a solute thereof is the mixture of methoxy polyethylene glycol methacrylate, crosslinking monomers triethylene glycol dmethylacrglate and methyl methacrylate; the unsaturated monomer is methacrylic acid, acrylic acid, hydroxyethyl methylacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate or hydroxypropyl acrylate. The ester slump retaining type polycarboxylate water reducer provided by the invention has good slump retaining performance, good dispersibility, good adaptability and low cost.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ester slump-retaining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] With the rise of large-scale infrastructure such as nuclear power, water conservancy, tunnels, and bridges in my country, the market demand for polycarboxylate high-performance water reducers continues to grow. Polycarboxylate superplasticizer has become a research and development hotspot in today's society because of its low dosage, high water reducing rate, strong designability, environmental friendliness and good compatibility with cement. [0003] Due to the needs of social division of labor and economic development, the performance requirements of polycarboxylate superplasticizers are also getting higher and higher. However, due to the change of cement, the mud content of sand and stone materials and other factors, the polycarboxylate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/14C08F230/02C08F220/06C08F4/40C08F2/38C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C04B2103/32
Inventor 张小芳方云辉蒋卓君柯余良郭鑫祺林添兴
Owner KZJ NEW MATERIALS GROUP CO LTD
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