Method for preparing macro-monomer synthesized polycarboxylate water reducer through alcoholysis of alkenyl-acyl chloride
A technology for synthesizing polycarboxylic acid and alkenyl chlorohydrin, which is applied in the field of polycarboxylic acid high-performance water reducer for concrete, can solve the problems of failure to achieve functional regulation of chemical admixtures, limit popularization and application, and achieve extreme side effects , expanding the theoretical connotation, and the effect of mild and stable polymerization reaction process
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[0026] Example 1
[0027] First, 22.07g of methacryloyl propyl trimethyl ammonium chloride and 1g of cyclohexanol were added to the reactor, and then 553.81g of water was added to prepare an aqueous solution with a mass concentration of 4%. The reactor was filled with nitrogen and repeated 3 times for deoxygenation. After 18 minutes, seal, add 5.97g cerium ammonium sulfate, stir for 18 minutes until it is evenly mixed, continue to raise the temperature to 10°C for polymerization reaction, and react for 16 hours to obtain an aqueous solution of hydroxyl-terminated cation side chain; The aqueous solution was vacuumed to remove the water in the system, 25g polyethylene glycol monomethyl ether (molecular weight=500), 5.43g acryloyl chloride, 262.52g dimethylformamide were added in sequence, and the stirring time was 10 minutes between each addition, and the temperature was raised to 40 After reacting for 4 hours, add 420.03g of methanol, wash the precipitate 5 times repeatedly, and d...
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[0028] Example 2
[0029] After storing the 30% polycarboxylic acid water-reducing agent solution obtained in Example 1 at 6° C. for 20 days, its implementation effect was measured.
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[0030] Example 3
[0031] First, 14.71g of methacryloxyethyl dimethylbutylammonium bromide and 0.74g of isobutanol were added to the reactor, and then 757.11g of water was added to prepare an aqueous solution with a mass concentration of 2%. The reactor was filled with nitrogen repeatedly After 4 times of deoxygenation for 30 minutes, seal it, add 0.6g of cerium ammonium sulfate, stir for 30 minutes until it is evenly mixed, continue to raise the temperature to 55°C for polymerization reaction, and react for 6 hours to obtain the hydroxyl-terminated cation side chain aqueous solution; The aqueous solution of the hydroxyl cation side chain was vacuumed to remove the water in the system, and 45g polyethylene glycol monomethyl ether (molecular weight=3000), 3.66g methacrylic acid chloride, 253.47g dimethyl sulfoxide were added in sequence, and the stirring time was interval between each addition. After 12 minutes, the temperature was raised to 85°C, after 2.5 hours of reaction, 633....
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