Method for preparing polycarboxylic acid water reducing agent

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of preparing high-concentration polycarboxylate water-reducing agent, and can solve the problem of inability to prepare high-concentration polycarboxylic acid water-reducing agent and the like

Inactive Publication Date: 2012-05-09
深圳市五山新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the above method cannot be used to prepare high-concentration polyc

Method used

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  • Method for preparing polycarboxylic acid water reducing agent

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Embodiment 1

[0015] First add MPEG600 (methoxypolyethylene glycol 600, which is liquid at room temperature): 600g and 98g of maleic anhydride to the four-necked flask, and raise the temperature to 118°C-122°C, and perform esterification reaction under nitrogen protection for 4-6 hours. To synthesize polyethylene glycol monomethyl ether monomaleic anhydride ester, add 1.125g of thioglycolic acid when the temperature drops below 50°C, and start adding styrene and initiator azobisisobutyronitrile dropwise when the temperature rises to 58°C-62°C The mixture consists of 52g styrene and 3.75g initiator azobisisobutyronitrile, and the mixture accounts for 5-10% of the total mass of the finished product. The mixture of styrene and azobisisobutyronitrile was dropped in 3.0 hours. After the drop was completed, the reaction was kept for 2 hours. When the temperature dropped below 30°C, 153g of 32% liquid caustic soda was added, and finally 77g of water was added to obtain a solid content of 80 % poly...

Embodiment 2

[0017] First add MPEG600: 600g and 147g maleic anhydride to a four-neck flask and raise the temperature to 118°C-122°C. For example, when heated to 122°C, esterify for 4-6 hours under the protection of nitrogen to synthesize polyethylene glycol monomethyl ether monomaline To acid anhydride ester, 1.7g of mercaptoacetic acid when the temperature is lowered to below 50°C, and when the temperature is raised to 60°C ± 2°C, the mixture of styrene and initiator azobisisobutylheptane is added dropwise, and the mixture is composed of 104g styrene and 5.1g Initiator azobisisoheptanonitrile composition. The styrene mixture was dropped in 3.5 hours. After the drop was completed, the heat preservation reaction was carried out for 2 hours. When the temperature dropped below 30°C, 184g of 32% liquid caustic soda was added, and finally 80g of water was added to obtain a polycarboxylate superplasticizer with a solid content of 80%. .

[0018] The polycarboxylate water reducer (commercially a...

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Abstract

The invention discloses a method for preparing a polycarboxylic acid water reducing agent, comprising the following steps of: adopting methoxy polyethylene glycol 600 or methoxy polyethylene glycol 400 and maleic anhydride to carry out an esterification reaction to obtain an active macromonomer of polyethylene glycol monomethyl ether maleic anhydride monoester; then, adding mercaptoacetic acid or mercaptoethanol when the temperature is cooled to less 50 DEG C, heating to 60 plus or minus 2 DEG C, initially dripping a mixture of styrene and azodiisobutyronitrile or azobisisoheptonitrile, reacting for 2 hours at the temperature of 60-65 DEG C, adding 32% liquid caustic soda to neutralize when the temperature is cooled to less than 30 DEG C; finally, adding a little water to dilute to obtain the polycarboxylic acid water reducing agent whose concentration is 80%. The styrene replaces the water to taken as the solvent, and the initiator of the azodiisobutyronitrile or the azobisisoheptonitrile is dissolved into the styrene, so that the styrene is taken as the solvent and the polymerized monomer simultaneously, and can prepare the polycarboxylic acid water reducing agent with relatively high concentration without post-treatment process. The polycarboxylic acid water reducing agent is suitable for long-range transportation; in addition, product quality is stable and use effect is good.

Description

technical field [0001] The invention relates to the technical field of concrete water reducers, in particular to a method for preparing high-concentration polycarboxylate water reducers by using styrene as a solvent. Background technique [0002] At present, domestically prepared polycarboxylate superplasticizers all use water as a solvent, and most of the initiators use water-soluble initiators such as hydrogen peroxide, ammonium persulfate, and potassium persulfate. Owing to adopting above-mentioned method to be unable to prepare the polycarboxylate superplasticizer of high concentration, the highest concentration can only reach 45%. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide a preparation method of a high-concentration polycarboxylate water reducer, which can increase the concentration of the polycarboxylate water reducer and reduce production costs. [0004] In order to solve the above problems, the pr...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F212/08C08F222/20C08F2/06C08G65/48C07C69/60C07C67/08C04B24/26C04B103/30
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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