A kind of preparation method of high performance water reducer
A high-performance, water-reducing agent technology, applied in the field of preparation of polycarboxylate high-performance water-reducing agent, can solve the problems that the polymer cannot obtain a comb-shaped molecular structure, the polymerization reaction is difficult to control, and the performance of the water-reducing agent is poor. , achieve the effect of shortening the polymerization reaction time, simple process and high water reducing rate
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[0037] Example 1
[0038] In a 1000ml flask equipped with a stirrer, thermometer, dropping funnel and condenser, add 300g methallyl polyoxyethylene ether (n=25), 20g sodium methacrylate sulfonate, 2g sodium sulfite and 160g deionized water. Stir and pass nitrogen protection. When the temperature rises to 50°C, start to drip an aqueous solution composed of 55 g acrylic acid and 37 g deionized water and an aqueous solution composed of 4.5 g sodium persulfate and 85 g deionized water. The acrylic acid aqueous solution was dropped in 2.5 hours, and the sodium persulfate aqueous solution was dropped in 3 hours. After the dripping is completed, continue the heat preservation reaction for 1 hour, then cool, neutralize with 30% sodium hydroxide solution to pH 6-7, and add water to adjust the solid content to 45% to obtain the target product of a slightly yellow viscous aqueous solution. The test results of the concrete water reduction rate and slump are shown in Table 1.
[0039]
Example Embodiment
[0040] Example 2
[0041] In a 1000ml flask equipped with a stirrer, thermometer, dropping funnel and condenser, add 300g methallyl polyoxyethylene ether (n=50), 10.5g sodium methacrylate sulfonate, 2g sodium sulfite and 160g to remove Ionized water. Stir and pass in nitrogen protection. When the temperature rises to 30°C, start to drip an aqueous solution composed of 30g acrylic acid and 20g deionized water and an aqueous solution composed of 4.5g sodium persulfate and 85g deionized water. The acrylic acid aqueous solution was dropped in 2.5 hours, and the sodium persulfate aqueous solution was dropped in 3 hours. After the dripping is completed, continue the heat preservation reaction for 1 hour, then cool, neutralize with 30% sodium hydroxide solution to pH 6-7, and add water to adjust the solid content to 45% to obtain the target product of a slightly yellow viscous aqueous solution. The test results of the concrete water reduction rate and slump are shown in Table 1.
[004...
Example Embodiment
[0043] Example 3
[0044] In a 1000ml flask equipped with a stirrer, thermometer, dropping funnel and condenser, add 300g methallyl polyoxyethylene ether (n=75), 7g sodium methacrylate sulfonate, 2g sodium sulfite and 160g deionized water. Stir and pass nitrogen protection. When the temperature rises to 60°C, start to drip an aqueous solution composed of 20 g acrylic acid and 13 g deionized water, and an aqueous solution composed of 4.5 g sodium persulfate and 85 g deionized water. The acrylic acid aqueous solution was dropped in 2.5 hours, and the sodium persulfate aqueous solution was dropped in 3 hours. After the dripping is completed, continue the heat preservation reaction for 1 hour, then cool, neutralize with 30% sodium hydroxide solution to pH 6-7, and add water to adjust the solid content to 45% to obtain the target product of a slightly yellow viscous aqueous solution. The test results of the concrete water reduction rate and slump are shown in Table 1.
[0045]
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