Synthesis method of slump-retaining polycarboxylic acid high-performance water-reducing agent
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A synthesis method and polycarboxylic acid technology, applied in the field of concrete additives, can solve the problems of low production efficiency, unstable product quality, long production cycle and the like
Inactive Publication Date: 2018-03-06
山西黄河新型化工有限公司
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[0002] The existing polycarboxylic acid high-performance water reducer is synthesized by solution polymerization at normal pressure and a certain temperature. Most of the polymerized monomers are uniformly added dropwise in about 3 hours, and the
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Embodiment 1
[0016] A method for synthesizing a slump-preserving polycarboxylate high-performance water reducer, the raw materials of which include methallyl alcohol polyoxyethylene ether, acrylic acid, mercaptopropionic acid, hydrogen peroxide, ascorbic acid, deionized water, and 30% sodium hydroxide; Features:
[0017] The synthesis steps are:
[0018] (1) Add 200kg deionized water and 300kg methallyl alcohol polyoxyethylene ether to the reactor, stir and heat to 60±2°C;
[0021] (4) After the solution prepared in step (1) is clarified, add 1 kg of hydrogen peroxide, keep the temperature at 60°C, and add the solutions ① and ② prepared in the above step (2)...
Embodiment 2
[0026] A method for synthesizing a slump-preserving polycarboxylate high-performance water reducer, the raw materials of which include methallyl alcohol polyoxyethylene ether, acrylic acid, mercaptopropionic acid, hydrogen peroxide, ascorbic acid, deionized water, and 30% sodium hydroxide; Features:
[0027] The synthesis steps are:
[0028] (1) Add 300kg deionized water and 400kg methallyl alcohol polyoxyethylene ether to the reactor, stir and heat to 60±2°C;
[0031] (4) After the solution prepared in step (1) is clarified, add 2kg of hydrogen peroxide, keep the temperature at 60°C, and use 10 to 20 minutes to evenly add the solutions ① and ...
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Abstract
The invention discloses a synthesis method of a slump-retaining polycarboxylic acid high-performance water-reducing agent. The synthesis method comprises the following synthesis steps: firstly, addingdeionized water and methallyl alcohol polyoxyethylene ether into a reaction still, stirring and heating to 60+/-2 DEG C; secondly, preparing a solution I: adding the deionized water, ascorbic acid and thiohydracrylic acid; preparing a solution II: adding the deionized water and acrylic acid; thirdly, preparing a solution III: adding the deionized water, the ascorbic acid and the thiohydracrylic acid; preparing a solution IV: adding the deionized water and the acrylic acid; fourthly, adding hydrogen peroxide into the first step, uniformly dropwise adding the solution I and the solution II prepared in the second step respectively; then dropwise adding the solution III and the solution IV prepared in the third step; fifthly, carrying out aging reaction for 60 minutes; sixthly, reducing the temperature to below 45 DEG C, adding caustic soda liquid containing 30 percent of sodium hydroxide and neutralizing until a pH value is 6 or so. The synthesis method has the beneficial effects that production cycle is shortened from original 5 to 6 hours to 3 hours now and the qualification rate of a product is increased from original 80 to 90 percent to 100 percent now.
Description
technical field [0001] The invention relates to a concrete additive, in particular to a synthesis method of a slump-preserving polycarboxylate high-performance water reducer. Background technique [0002] The existing polycarboxylic acid high-performance water reducer is synthesized by solution polymerization at normal pressure and a certain temperature. Most of the polymerized monomers are uniformly added dropwise in about 3 hours, and then aged at a certain temperature for a certain period of time. The supply and demand are 5-6 hours, the production cycle is long, the production efficiency is low, the product quality is unstable, and the product qualification rate is only 80-90%. Contents of the invention [0003] The purpose of the present invention is to make up for the deficiencies of the prior art, and to provide a slump-preserving polycarboxylate high-performance water reducer that shortens the production cycle from the original 5 to 6 hours to about 3 hours and imp...
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