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Method for preparing polycarboxylic acid water reducing agent by using sodium methyl acryl sulfonate as chain transfer agent

A technology of sodium methacrylate and chain transfer agent, which is applied in the field of concrete water reducing agent, can solve the problems of not conforming to the concept of green environmental protection, high toxicity, and polluting the construction environment, so as to avoid the poisonous effect on the human body and avoid pollution Effect

Inactive Publication Date: 2012-06-20
深圳市五山新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, thioglycolic acid or mercaptopropionic acid is used as chain transfer agent in the synthesis of high-performance polycarboxylate superplasticizers. Because thioglycolic acid or mercaptopropionic acid has a foul smell and high toxicity, it pollutes both the synthesis environment and the construction environment. Does not conform to the concept of green environmental protection

Method used

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  • Method for preparing polycarboxylic acid water reducing agent by using sodium methyl acryl sulfonate as chain transfer agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First add 930g of tap water, 1800g of modified polyether methylbutenol polyoxyethylene ether, and 20g of sodium methacrylic acid sulfonate to the reaction kettle (four-necked flask), heat up and dissolve, and start to prepare liquid A and liquid B at the same time. Liquid A is made by mixing 22g ammonium persulfate and 580g water, i.e. ammonium persulfate solution; liquid B is made by mixing 193g acrylic acid, 16g sodium methacrylic acid sulfonate and 180g water, i.e. acrylic acid solution; (The mixture of water, sodium methacrylate and modified polyether) starts to add liquid A and liquid B dropwise when it reaches 58°C~62°C, liquid A drops 3.5 hours after dropping, and drops 1 / 3 1.5 hours before dropping B, After the last 1.5h, drop 2 / 3, when the liquids A and B are dropped, keep warm for 1 hour. The temperature of the heat preservation reaction is controlled at 60°C to 65°C. When the temperature drops below 45°C, 1100g of make-up water and 220g of 32% liquid caustic ...

Embodiment 2

[0019] First add 930g of tap water, 1800g of modified polyether methylbutenol polyoxyethylene ether, 16g of sodium methacrylic acid sulfonate to the four-neck flask, heat up and dissolve, and start to prepare liquid A and liquid B at the same time, that is, ammonium persulfate solution And acrylic acid solution, wherein A liquid is formed by mixing 22g of ammonium persulfate and 580g of water, and B liquid is formed by mixing 193g of acrylic acid, 16g of sodium methacrylate sulfonate and 185g of water.

[0020] When the four-neck flask (mixture of water, sodium methacrylate and modified polyether) reaches 58°C-62°C, start to add liquid A and liquid B dropwise, liquid A drops 3.5h, and B drops 1.5h Drop 1 / 3, then drop 2 / 3 in the last 1.5 hours. After A and B drops, keep warm for 1 hour, control the reaction temperature at 60°C to 65°C, and add supplementary water 1100g and 32% solution when the temperature drops below 45°C Neutralize with 220g of alkali to finally obtain a poly...

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Abstract

The invention discloses a method for preparing a polycarboxylic acid water reducing agent by using sodium methyl acryl sulfonate as a chain transfer agent. The method comprises the following steps of: firstly, adding water, sodium methyl acryl sulfonate and modified polyether in a reaction kettle; then mixing sodium methyl acryl sulfonate and acrylic acid with water to prepare an acrylic acid solution, mixing water with ammonium persulfate to prepare an ammonium persulfate solution; when the temperature of materials reaches 60 DGE C+ / -2 DEG C, simultaneously dropwise adding the ammonium persulfate solution and the acrylic acid solution; and carrying out heat insulation reaction for 1-3 hours and when cooling below 45 DEG C, adding 32% liquid caustic soda for neutralization so as to obtain the polycarboxylic acid water reducing agent having the PH value of 6-7 and 40% of solid content. Because sodium methyl acryl sulfonate is used as the chain transfer agent instead of mercaptoacetic acid or mercaptopropionic acid in the preparation process of the polycarboxylic acid water reducing agent, environment pollution and toxic action on a human body caused by stink odor and strong corrosivity of mercaptoacetic acid or mercaptopropionic acid can be avoided.

Description

technical field [0001] The invention relates to the technical field of concrete water reducers, in particular to a method for preparing polycarboxylate water reducers by using sodium methacrylate as a chain transfer agent. Background technique [0002] At present, thioglycolic acid or mercaptopropionic acid is used as chain transfer agent in the synthesis of high-performance polycarboxylate superplasticizers. Because thioglycolic acid or mercaptopropionic acid has a foul smell and high toxicity, it pollutes both the synthesis environment and the construction environment. Does not conform to the concept of green environmental protection. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide a method for preparing polycarboxylate water reducer by using sodium methacrylate as a chain transfer agent, so as to avoid pollution to the environment and harm to the human body during the preparation process of polycarboxylate wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F228/02C08G65/28C04B24/16C04B103/30
Inventor 竹国斌丁联合
Owner 深圳市五山新材料股份有限公司
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