Low-temperature synthesis polycarboxylate superplasticizer and preparation method thereof

A polycarboxylic acid and water reducing agent technology, applied in the field of building materials, can solve the problems of ineffective adaptation and poor concrete adaptability, and achieve the effects of good dispersibility, dispersibility retention ability, high conversion rate, and reduced side reactions.

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

With the continuous development of technology, the products and types of new polyether monomers are also emerging, such as double-ended alkenyl polyoxyethylene ether, polyoxyethylene polyoxypropylene block polyether, etc., but due to the combination with acrylic derivatives The activity matching of free radical polymerization, the air-entraining quality of polyether itself in the concrete multi-phase system and other problems make the concrete adaptability of the synthetic polycarboxylate superplasticizer poor, that is, the existing polycarboxylate superplasticizer is still Cannot effectively adapt to the above new polyether raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In parts by weight, mix 15 parts of acrylic acid, 2 parts of hydroxypropyl acrylate, 1 part of ethylene glycol monoallyl ether, 4 parts of potassium hydroxide with a mass concentration of 30% and 30 parts of deionized water, and cool to After 15°C, add 0.8 parts of 2-mercaptoethanol to configure the first mixed solution; prepare 0.2 parts of 2-hydroxy-2-sulfinic acid, 0.2 parts of sodium formaldehyde sulfoxylate and 30 parts of deionized water to prepare Mix the second solution; make up a mixed third solution by mixing 0.1 part of ascorbic acid and 30 parts of deionized water.

[0032] Will 200 copies of CH 2 =CH-O-(CH 2 ) 4 -(CH 2 CH 2 O) 23 H (purchased from Shandong Boke Chemical Co., Ltd.), 200 parts of deionized water were added to the reactor; the temperature of the reaction system was controlled to be 12°C, and 5 parts of acrylic acid and 2.5 parts of 30% mass concentration of supernatant were added to the reactor at one time. Hydrogen oxide and 0.1 part of...

Embodiment 2

[0034] In parts by weight, mix 8 parts of acrylic acid, 10 parts of hydroxyethyl acrylate, 2 parts of vinyl n-octyl ether, 6 parts of potassium hydroxide with a mass concentration of 30% and 30 parts of deionized water, and cool to 15 °C , adding 1.6 parts of 2-mercaptoacetic acid to configure the first mixed solution; Mix the second solution; make up a mixed third solution by mixing 0.1 part of ascorbic acid and 30 parts of deionized water.

[0035] Will 200 copies of CH 2 =CH-O-(CH 2 ) 2 -(CH 2 CH 2 O) 53 H. Add 200 parts of deionized water into the reactor; control the temperature of the reaction system at 10°C, add 8 parts of acrylic acid, 3.5 parts of 30% mass concentration of hydrogen peroxide and 0.06 parts of ferrous sulfate heptahydrate to the reactor at one time ; After the above steps are completed, drop and mix the first solution and B in the reactor, and the dropwise addition is completed in 60 minutes; then continue to drop and mix the third solution, and a...

Embodiment 3

[0037]In parts by weight, mix 5 parts of acrylic acid, 20 parts of hydroxypropyl methacrylate, 1 part of vinyl lauryl ether, 2 parts of potassium hydroxide with a mass concentration of 30% and 30 parts of deionized water, and cool After reaching 15°C, add 0.5 parts of 3-mercaptopropanol to configure the first mixed solution; prepare 0.6 parts of 2-hydroxy-2-sulfonic acid, 0.5 parts of sodium formaldehyde sulfoxylate and 30 parts of deionized water Mix the second solution; 0.3 parts of ascorbic acid and 30 parts of deionized water are configured to mix the third solution.

[0038] Will 150 CH 2 =CH-O-CH 2 -(CH 2 CH 2 O) 40 -(CH 2 CH 2 CH2O) 2 H (purchased from Shandong Boke Chemical Co., Ltd.), 150 parts of deionized water were added to the reactor; the temperature of the reaction system was controlled at 5°C, and 10 parts of acrylic acid and 5 parts of 30% mass concentration of supernatant were added to the reactor at one time. Hydrogen oxide and 0.03 parts of ferrous ...

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PUM

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Abstract

The invention discloses a low-temperature synthesis polycarboxylate superplasticizer and a preparation method thereof. The low-temperature synthesis polycarboxylate superplasticizer comprises 150-250 parts by weight of unsaturated polyether, 2-30 parts by weight of unsaturated hydroxyl ester, 1-2 parts by weight of vinyl ether, 10-30 parts by weight of acyclic acid, 2-10 parts by weight of potassium hydroxide solution with the mass concentration of 30-35%, 0.5-2 parts by weight of chain transfer agent, 0.2-0.8 part by weight of low-temperature reducing agent, 0.1-0.5 part by weight of sodium sulfoxylate formaldehyde, 0.1-0.5 part by weight of ascorbic acid, 1-5 parts by weight of hydrogen dioxide solution with the mass concentration of 30-35%, 0.01-0.1 part by weight of ferrous sulfate, 12-20 parts by weight of sodium hydroxide solution with the mass concentration of 30-35% and 240-340 parts by weight of deionized water. The polycarboxylate superplasticizer can well adapt to a novel polyether raw material and is good in dispersibility and dispersibility keeping capability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a low-temperature synthesized polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The construction of various industrial and civil buildings, highway and railway bridges, airport runways, mine construction, hydraulic structures, marine development, geothermal engineering, and military projects cannot do without concrete. Compared with other building materials, concrete has the advantages of easy raw materials It has the characteristics of wide application range, low energy loss and long service life. [0003] In recent years, the performance of concrete materials has been greatly improved and the rapid development of construction technology has led to the development of concrete in the direction of high performance and multifunctionality. case application. As polycarboxylate superplasticizers are used more and mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/30
Inventor 方云辉柯余良吴银财曾贤华张小芳
Owner KZJ NEW MATERIALS GROUP CO LTD
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