Polycarboxylic acid slump retaining agent with low bleeding rate and preparation method thereof
A technology of polycarboxylic acid and slump-retaining agent, which is applied in the field of polycarboxylate slump-retaining agent and its preparation, can solve the problems of large slump loss, poor slump retention, poor workability, etc., and achieve slump retention Good, low slump loss, low bleeding rate
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Embodiment 1
[0020] Formula: 35g of polyoxyethylene acrylic acid, 28g of acrylic acid, 5g of ammonium persulfate, 2.5g of sodium methacrylate, 2.5g of sodium hydroxide, 5g of thioglycolic acid and 130g of purified water.
[0021] Process:
[0022] 1. Weigh the raw materials of each component according to the formula;
[0023] 2. Raise the temperature of purified water with half of the formula ratio to 42°C, then add acrylic acid polyoxyethylene ether to the water, then add acrylic acid and ammonium persulfate with half the formula ratio, and stir to obtain a mixture; heat to heat the temperature of the mixture to 52°C, then add the remaining amount of acrylic acid, stir, and then raise the temperature of the reaction system to 60°C to obtain the heated material;
[0024] 3. Insulate the heated material in step 2 for 2.5 hours, then add the solution of sodium methacrylate, the remaining amount of ammonium persulfate and the remaining amount of purified water dropwise into the...
Embodiment 2
[0026] Formula: 38g of polyoxyethylene acrylic acid, 35g of acrylic acid, 8g of ammonium persulfate, 3g of sodium methacrylate, 3g of sodium hydroxide, 8g of thioglycolic acid and 150g of purified water.
[0027] Process:
[0028] 1. Weigh the raw materials of each component according to the formula;
[0029] 2. Raise the temperature of purified water with half the proportion of the formula to 45°C, then add polyoxyethylene acrylic acid ether to the water, then add acrylic acid and ammonium persulfate with half the proportion of the formula, stir to obtain a mixture; heat to heat the temperature of the mixture to 55°C, then add the remaining amount of acrylic acid, stir, and then raise the temperature of the reaction system to 60°C to obtain the heated material;
[0030] 3. Insulate the material after the temperature rise in step 2 for 3 hours, then dropwise add the solution of sodium methacrylate, the remaining amount of ammonium persulfate and the remaining amo...
Embodiment 3
[0032] Formula: 33g of polyoxyethylene acrylic acid, 25g of acrylic acid, 3g of ammonium persulfate, 2g of sodium methacrylate, 2g of sodium hydroxide, 3g of thioglycolic acid and 120g of purified water.
[0033] Process:
[0034] 1. Weigh the raw materials of each component according to the formula;
[0035] 2. Raise the temperature of purified water with half of the formula ratio to 40-45°C, then add acrylic acid polyoxyethylene ether to the water, then add acrylic acid and ammonium persulfate with half the formula ratio, and stir to obtain a mixture; Heating the temperature to 50-55°C, then adding the remaining amount of acrylic acid, stirring, and then raising the temperature of the reaction system to 58-62°C to obtain the heated material;
[0036] 3. Insulate the heated material in step 2 for 2-3 hours, then add the solution of sodium methacrylate, the remaining amount of ammonium persulfate and the remaining amount of purified water dropwise into the reac...
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