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Preparation method of mud-resistant type polycarboxylate superplasticizer

A technology of superplasticizer and polycarboxylic acid, applied in the field of concrete admixtures, can solve the problems of excessive loss and high dust particle content, and achieve the effects of increased water reduction rate, less equipment investment, and favorable industrial production.

Inactive Publication Date: 2011-06-15
江苏汇迪建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a kind of reasonable process, simple operation, and the preparation of anti-mud type polycarboxylate superplasticizer that is beneficial to industrial production in view of the phenomenon that polycarboxylate water reducer has a high dust particle content and loses too quickly method to solve this technical problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of anti-mud type polycarboxylate superplasticizer, comprises the following steps:

[0025] (1) Esterification reaction, add 400g of polyethylene glycol monomethyl ether with a degree of polymerization of 5 and 84g of acrylic acid into the reactor, then add 2.5g of hydroquinone as a polymerization inhibitor, and 2.5g of p-toluene as a catalyst Stir 15g of sulfonic acid and 2000g of cyclohexane as a dewatering agent evenly. After hydroquinone and p-toluenesulfonic acid are completely dissolved, keep the temperature at 100-110°C for esterification reaction for 7-9 hours, filter and vacuumize Remove cyclohexane to obtain polyethylene glycol monomethyl ether acrylate 400g;

[0026] (2) Polymerization reaction, use the prepared polyethylene glycol monomethyl ether acrylate to make 666.7g of 60% polyethylene glycol monomethyl ether acrylate aqueous solution; when heating 1740g of water to 80-90℃, add dropwise The mixed solution made of polyethylene glycol...

Embodiment 2

[0030] A preparation method of anti-mud type polycarboxylate superplasticizer, comprises the following steps:

[0031] (1) Esterification reaction, add 500g of polyethylene glycol monomethyl ether with a degree of polymerization of 15 and 90g of acrylic acid into the reactor, then add 5g of hydroquinone as a polymerization inhibitor, and p-toluenesulfonate as a catalyst Stir 18g of acid and 2300g of cyclohexane as a dewatering agent evenly. After hydroquinone and p-toluenesulfonic acid are completely dissolved, keep the temperature at 100-110°C for esterification reaction for 7-9 hours, filter, and remove in a vacuum Cyclohexane obtains polyethylene glycol monomethyl ether acrylate 420g;

[0032] (2) Polymerization reaction, use the prepared polyethylene glycol monomethyl ether acrylate to prepare 65% polyethylene glycol monomethyl ether acrylate aqueous solution 646.2g; heat 2000g of water to 80-90℃, add dropwise A mixed solution made of polyethylene glycol monomethyl ether ...

Embodiment 3

[0036] A preparation method of anti-mud type polycarboxylate superplasticizer, comprises the following steps:

[0037] (1) Esterification reaction, add 600g of polyethylene glycol monomethyl ether with a degree of polymerization of 35 and 95g of acrylic acid into the reactor, then add 8g of hydroquinone as a polymerization inhibitor, and p-toluenesulfonate as a catalyst Stir 20g of acid and 2500g of cyclohexane as a dewatering agent evenly. After hydroquinone and p-toluenesulfonic acid are completely dissolved, keep the temperature at 100-110°C for esterification reaction for 7-9 hours, filter, and remove in a vacuum Cyclohexane obtains polyethylene glycol monomethyl ether acrylate 450g;

[0038](2) Polymerization reaction, use the prepared polyethylene glycol monomethyl ether acrylate to make 642.9g of 70% polyethylene glycol monomethyl ether acrylate aqueous solution; when heating 2300g of water to 80-90℃, add dropwise A mixed solution made of polyethylene glycol monomethyl...

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Abstract

The invention relates to a preparation method of a mud-resistant type polycarboxylate superplasticizer. First, polyethylene glycol monomethyl ether and acrylic acid are used as raw materials and synthetized into polyethylene glycol monomethyl ether methyl acrylate. Then, the prepared polyethylene glycol monomethyl ether methyl acrylate is copolymerized with mixed liquid which is made from the acrylic acid and diacrylamide sodium dimethallyl sulphonate and mixed liquid which is made from ammonium persulfate and mercaptoethanol, alkaline compounds are added to regulate a pH value to 7-8 after reaction, and the mud-resistant type polycarboxylate superplasticizer is obtained. In the preparation method, technical parameters and conditions, such as raw material ratio, the used amount of chain transfer agents and initiators, copolymerization temperature, time and the like are determined. The reaction conditions are mild, the adopted equipment is simple, the equipment investment is small, the technology is reasonable, and the operation is simple and favorable for industrial production.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a preparation method of a mud-resistant polycarboxylic acid superplasticizer. Background technique [0002] The development of cement plasticizers (also known as water reducers) has a long history. In 1935, E. W. Scripcher of the United States first developed a plasticizer with lignosulfonate as the main component, which was widely used in C 20 -C 40 Concrete, which promotes the development of concrete to medium strength; in 1962, Japan successfully developed a naphthalenesulfonic acid formaldehyde condensate high-efficiency water reducer. This type of water reducer has the advantages of low production cost and good water reducing rate, so it is widely used at C 30 -C 60 Concrete, promoting the development of concrete to high strength. However, the slump loss of the prepared concrete is fast, which cannot meet the construction requirements such as pumping, and ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/28C08F220/06C08G65/48C04B24/16C04B103/30
Inventor 李华威徐友娟胡华强
Owner 江苏汇迪建材有限公司
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