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Preparation method of high-solid-content ester polycarboxylic acid water reducing agent

A technology of ester polycarboxylic acid and water reducing agent, applied in the field of concrete admixtures, can solve the problems of increasing production cost, increasing concentration and separation steps, etc., and achieves the effects of cost saving, improving conversion rate and excellent performance

Active Publication Date: 2015-11-11
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only increases the steps of concentration and separation, but also increases the production cost

Method used

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  • Preparation method of high-solid-content ester polycarboxylic acid water reducing agent
  • Preparation method of high-solid-content ester polycarboxylic acid water reducing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Esterification and amidation reaction: in parts by weight, 120 parts of molecular weight are 1200 polyethylene glycol monomethyl ether and 50 parts of molecular weight are 2000 polyethylene glycol monomethyl ether, 7 parts of molecular weight are 500 Amino-terminated polyoxypropylene ether, 16 parts of methacrylic acid, 8.5 parts of methanesulfonic acid and 0.4 parts of mixed polymerization inhibitor were added to reactor A equipped with a condensing device, and kept at a constant temperature of 95°C under nitrogen protection React for 5 hours to obtain the first mixture containing polyethylene glycol monomethyl ether methacrylate, isoacryloyl polyoxypropylene ether amine monomer, and methacrylic acid; wherein: the mixed polymerization inhibitor is by weight Calculated as hydroquinone:p-hydroxyanisole=2:1, the following embodiments can also be the same.

[0025] (2) Copolymerization reaction: in parts by weight, place 80 parts of the first mixture obtained in step (...

Embodiment 2

[0028] (1) Esterification and amidation reaction: in parts by weight, 120 parts of molecular weight are 1200 polyethylene glycol monomethyl ether and 50 parts of molecular weight are 2000 polyethylene glycol monomethyl ether, 7 parts of molecular weight are 1200 Add amino-terminated polyoxypropylene ether, 50 parts of methacrylic acid, 11 parts of methanesulfonic acid and 1 part of mixed polymerization inhibitor into reactor A equipped with a condensing device, and keep the temperature at 120°C under the protection of nitrogen After reacting for 7 hours, the first mixture containing polyethylene glycol monomethyl ether methacrylate, isoacryloyl polyoxypropylene ether amine monomer and methacrylic acid was obtained.

[0029] (2) Copolymerization reaction: in parts by weight, place 80 parts of the first mixture obtained in step (1) in the reactor B; 70 parts of the first mixture are placed in the dripping device B1, and then add 3 parts of methyl methacrylate, 4 parts of hydroxy...

Embodiment 3

[0032] (1) Esterification and amidation reaction: in parts by weight, 120 parts of molecular weight are 2000 polyethylene glycol monomethyl ether and 50 parts of molecular weight are 3000 polyethylene glycol monomethyl ether, 7 parts of molecular weight are 500 Amino-terminated polyoxypropylene ether, 23 parts of methacrylic acid, 11 parts of p-toluenesulfonic acid and 0.8 parts of mixed polymerization inhibitor were added to reactor A equipped with a condensing device, under the protection of nitrogen, at 100 ° C After constant temperature reaction for 6 hours, the first mixture containing polyethylene glycol monomethyl ether methacrylate, isoacryloyl polyoxypropylene ether amine monomer and methacrylic acid was obtained.

[0033](2) Copolymerization reaction: in parts by weight, place 80 parts of the first mixture obtained in step (1) in the reactor B; 70 parts of the first mixture are placed in the dripping device B1, and then add 3 parts of hydroxypropyl acrylate, 3 parts ...

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Abstract

The invention discloses a preparation method of a high-solid-content ester polycarboxylic acid water reducing agent, which comprises the following steps: (1) mixing polyethyleneglycol monomethyl ether, amino-terminated polyoxypropylene ether, methacrylic acid, a catalyst and a mixed polymerization inhibitor to react to obtain a first mixture; (2) adding unsaturated carboxylate, a cationic monomer and a chain-transfer agent into 70-75 parts of the first mixture, and uniformly mixing to obtain a second mixture; mixing an initiator and acrylic acid to obtain a third mixture; dropwisely adding the third mixture and second mixture into 80-85 parts of the 45-80-DEG C first mixture within 1.5-2 hours, keeping the temperature at 45-80 DEG C to react for 1-1.5 hours, and after the reaction finishes, adding water to regulate the concentration of the system to 80-85%; and (3) adding sodium hydroxide into the material obtained in the step (2) for neutralization to obtain the high-solid-content ester polycarboxylic acid water reducing agent. The method has the advantages of high production efficiency and environment friendliness. The prepared product has excellent properties, and is convenient for storage and line haul.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a high-solid-content ester polycarboxylate water reducer. Background technique [0002] With the construction of national large-scale infrastructure nuclear power, water conservancy, bridges and various large-scale projects, the performance requirements of concrete are constantly improving, which will inevitably lead to higher requirements for the performance of concrete admixtures. [0003] Polycarboxylate superplasticizer has become a hot research topic in today's society because of its low dosage, high water reducing rate, high strength, durability and good cement compatibility. At present, there are mainly two types of ether and ester polycarboxylic acids. The excellent water-reducing performance of ether-based polycarboxylate superplasticizers has been widely recognized by the industry, but in the actual application process, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/28C08F220/34C08F220/14C08F8/44C04B24/26C04B103/30
Inventor 张小芳方云辉柯余良曾贤华吴银财李格丽林倩
Owner KZJ NEW MATERIALS GROUP CO LTD
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