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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Embodiment 1
[0027] First, 22.07g of methacryloylpropyltrimethylammonium 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%, and the reactor was filled with nitrogen to remove oxygen repeatedly 3 times Seal it after 18 minutes, add 5.97g of ceric ammonium sulfate, stir for 18 minutes until it is mixed evenly, continue to heat up to 10°C for polymerization reaction, and react for 16 hours to obtain an aqueous solution of hydroxyl-terminated cation side chains; The aqueous solution was vacuumed to remove the water in the system, and 25g of polyethylene glycol monomethyl ether (molecular weight=500), 5.43g of acryloyl chloride, and 262.52g of dimethylformamide were sequentially added, and the stirring time was 10 minutes between each addition, and the temperature was raised to 40 ℃, after 4 hours of reaction, add 420.03g of methanol, wash the precipitate repeatedly 5 times, vacuum dry the...
Embodiment 2
[0029] After the polycarboxylate superplasticizer solution with a mass fraction of 30% obtained in Example 1 was stored at 6° C. for 20 days, its implementation effect was measured.
Embodiment 3
[0031] First, 14.71g of methacryloyloxyethyl dimethyl butyl ammonium bromide and 0.74g of isobutanol were added to the reactor, then 757.11g of water was added to prepare an aqueous solution with a mass concentration of 2%, and the reactor was filled with nitrogen repeatedly After 4 times of deoxygenation for 30 minutes, seal it, add 0.6g of ammonium cerium sulfate, stir for 30 minutes until it is evenly mixed, continue to heat up to 55°C for polymerization reaction, and react for 6 hours to obtain an aqueous solution of hydroxyl-terminated cation side chains; The hydroxyl cation side chain aqueous solution was vacuumed to remove the water in the system, and 45g polyethylene glycol monomethyl ether (molecular weight = 3000), 3.66g methacryloyl chloride, 253.47g dimethyl sulfoxide were added in sequence, and the stirring time between each addition was After 12 minutes, the temperature was raised to 85°C. After 2.5 hours of reaction, 633.69g of methanol was added, the precipitate...
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