Method for preparing polycarboxylate water reducing agent

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of preparation of polycarboxylate water reducing agent, can solve the problem that it is difficult to take into account plasticity preservation and high water reducing rate, cannot achieve the effect of normal water reducing agent, and cannot meet the requirements of construction. and other problems, to achieve the effect of solving the easy discoloration of light, reducing the damage rate and simplifying the production process

Active Publication Date: 2011-04-13
ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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  • Abstract
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Problems solved by technology

[0005] The polycarboxylate superplasticizers currently researched in China are difficult to take into account the advantages of plastic retention and high water reducing rate
In the patent CN1948209B, a method for preparing polycarboxylate water reducer from maleic anhydride is disclosed. Although maleic anhydride is easy to undergo esterification reaction with alcohols in this method, the polymer with other monomers cannot reach normal The effect of water reducer; patent CN1636922 discloses a kind of preparation method of polycarboxylate concrete water reduction, although the price of acrylic acid in the synthesis method is low, but the characteristics...

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  • Method for preparing polycarboxylate water reducing agent
  • Method for preparing polycarboxylate water reducing agent
  • Method for preparing polycarboxylate water reducing agent

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Embodiment 1

[0034] Terpolymer polycarboxylate superplasticizer PAM, MAS, ITA monomer molar ratio is 1: (1-1.2): (1-1.5), the following PAM, MAS, ITA molar ratio is 1:1:1 Taking the implementation method of synthesizing polycarboxylate superplasticizer as an example, discuss the influence of the ratio of polymerized monomers on the performance of concrete;

[0035] (1) Synthesis of PAM: put 12000kg MPEG-1200), 1176kg MAH, 20.664kg catalyst PTSA into the reactor and stir evenly, control the molar ratio of polyethylene glycol monomethyl ether, maleic anhydride, toluenesulfonic acid to be 1: 1.2 : 0.012, at normal pressure, temperature is 90 ℃ under the condition of esterification reaction 8h, take away moisture by inert gas as water-carrying agent, esterification rate is 90%, obtain 11682kg polyethylene glycol monomethyl ether maleic acid activity macromonomer PAM;

[0036] (2), step (1) 11682kg polyethylene glycol monomethyl ether maleic acid reactive macromonomer PAM and 1422kg sodium met...

Embodiment 2

[0043] The molar ratio of the terpolymer polycarboxylate water reducer PAM, MAS, and ITA monomers is controlled as 1:1.2:1, and the influence of the molecular weight of MPEG on the performance of concrete mixed with polycarboxylate water reducer is discussed; the following uses MPEG The molecule is 1200 cases of synthetic polycarboxylate superplasticizer, other data can be analogized:

[0044] (1) Synthesis of PAM: 12000kg MPEG-1200, 1176kg MAH, and 20.664kg catalyst PTSA were dropped into the reactor and stirred evenly, and the molar ratio of polyethylene glycol monomethyl ether, maleic anhydride, and toluenesulfonic acid was controlled to be 1: 1.2:0.012, under normal pressure and temperature at 90°C, esterification reaction took place for 8 hours, and the moisture was taken away by inert gas as a water-carrying agent. The esterification rate was 90%, and 11682kg of polyethylene glycol monomethyl ether maleic acid was obtained. active macromonomer PAM;,

[0045] (2) step (1...

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Abstract

The invention discloses a polycarboxylate water reducing agent for a gobi desert environment. The polycarboxylate water reducing agent is mainly prepared by the following steps of: synthesizing poly(ethylene glycol methyl ether) maleic anhydride active macromonomer (PAM) by performing esterification reaction on poly(ethylene glycol methyl ether) (MPEG) and maleic anhydride (MAH) which serve as main raw materials; preparing a terpolymer by copolymerization of the PAM, sodium methallyl sulfonate (MAS) and itaconic acid (ITA) which serve as raw materials by free radicals; and neutralizing the terpolymer with a base solution. The polycarboxylate water reducing agent has excellent performance, such as high water reducing ratio, little cement paste gradual loss, high cost performance and the like, so that the problem that monomer with large activity difference is difficult to control is solved, and the requirement of construction in the gobi desert environment can be met.

Description

technical field [0001] The invention relates to the field of preparation of concrete admixtures, in particular to a preparation method of polycarboxylate water reducer. Background technique [0002] As the third generation of high-efficiency water reducer, polycarboxylate water reducer has become a new research topic in the field of concrete admixtures at home and abroad because of its high water reducing rate, small slump loss, good adaptability to cement, and environmental protection. direction. [0003] Recently, the technology of foreign polycarboxylate superplasticizers has developed relatively rapidly, and the control of production processes is relatively mature. According to reports, Japanese polycarboxylic acid products account for more than 70% of the total number of products, and research centers in North America and Europe have also begun to develop and transfer to this direction, while my country is in the stage of research and development, and the comprehensive...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F228/02C08F222/02C08F4/40C08G65/48C04B24/16C04B103/30
Inventor 黄玉华汪志勇黄海陈钱宝陈娟李龙
Owner ANHUI ZHONGTIE ENGINEER MATERIAL SCI & TECH CO LTD
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