Polycarboxylic acid water reducing agent for gypsum and preparation method thereof

A technology of water reducer and polycarboxylic acid, which is applied in the field of polycarboxylate water reducer for gypsum and its preparation, can solve the problems of cumbersome operation and unfavorable rapid production of gypsum boards, achieve low energy consumption, do not delay gypsum solidification, and repeat good stability effect

Active Publication Date: 2012-01-25
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires the use of dispersants and auxiliary dispersants in the application process, which is cumbersome to operate, and such dispersants have a retarding effect on gypsum, which is not conducive to the rapid production of gypsum boards

Method used

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  • Polycarboxylic acid water reducing agent for gypsum and preparation method thereof
  • Polycarboxylic acid water reducing agent for gypsum and preparation method thereof
  • Polycarboxylic acid water reducing agent for gypsum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 120g of GE-1 and 120g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 80°C. Add dropwise the monomer aqueous solution that is mixed with 17.6g methacrylic acid, 1.6g2-mercaptopropionic acid, 90g deionized water and 10g of potassium persulfate aqueous solution of 10wt% at the same time, drop time is controlled at about 90 minutes, and reaction temperature is controlled at 78 -85°C. After the dropwise addition, the temperature was kept for 45 minutes to complete the polymerization. Add 17.25 g of 28 wt % ammonia water to neutralize to about pH 6.5. The water reducer of the present invention was obtained, which was designated as PG-1.

Embodiment 2

[0033] Add 120g of GE-2 and 120g of deionized water into a 500ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 80°C. At the same time, 10 g of monomer aqueous solution mixed with 35.6 g of methacrylic acid, 7.6 g of sodium vinyl sulfonate, 1.2 g of mercaptoethanol, 70 g of deionized water and 10 wt % of ammonium persulfate aqueous solution were added dropwise, and the dropping time was controlled at about 90 minutes , the reaction temperature is controlled at 78-85°C. After the dropwise addition, the temperature was kept for 45 minutes to complete the polymerization. Add 13.75 g of 28 wt % ammonia water to neutralize to about pH 6.5. The water reducer of the present invention is obtained, which is denoted as PG-2.

Embodiment 3

[0035]Add 120g of GE-3 and 120g of deionized water into a 500ml four-neck flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 85°C. Simultaneously add dropwise the monomer aqueous solution mixed with 17.28g methacrylic acid, 0.8g mercaptoacetic acid, 70g deionized water, 7.8g butyl methacrylate and 10g aqueous potassium persulfate solution of 15wt%, and the dropping time is controlled at about 120 minutes , the reaction temperature is controlled at 83-88°C. After the dropwise addition was completed, the insulation was kept for 30 minutes to complete the polymerization. Add 15g of 28wt% ammonia water to neutralize to about pH 6.5. The water reducer of the present invention was obtained, which was designated as PG-3.

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Abstract

The invention discloses a polycarboxylic acid water reducing agent for gypsum and a preparation method thereof. The water reducing agent is prepared by copolymerizing unsaturated polyoxyalkylene base ether monomers, unsaturated monocarboxylic acid and derivative monomers thereof, and other monomers capable of being copolymerized with those monomers in a radical polymerization system. The gypsum water reducing agent has the advantages of high water-reducing rate, no delayed coagulation and the like, and the preparation method has the advantages of low energy consumption, high efficiency and good repeatability and stability.

Description

technical field [0001] The invention relates to a water reducer and a method for preparing the agent, in particular to a polycarboxylate water reducer for gypsum and a preparation method thereof. Background technique [0002] Gypsum raw materials are divided into natural gypsum and industrial by-product gypsum. With the development of industry and science and technology, according to the characteristics and application methods of gypsum. The use of gypsum can be roughly divided into two categories: the first gypsum is directly used without satin firing, mainly used to adjust cement condensation, nickel smelting, tofu solidification, optical instruments, gypsum casting molds, etc.; Mature gypsum, used in the production of building materials, ceramic models, dental materials, chalk, handicrafts, grinding glass, tofu solidification, etc. Among them, gypsum cementitious material is one of the three traditional cementitious materials. Its raw materials can be natural gypsum an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08G65/48C04B103/30
CPCC04B24/2694C04B2103/302C04B28/14
Inventor 傅乐峰郑柏存冯中军张毅邓最亮
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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