Preparation method for polycarboxylate superplasticizer
A technology of water reducing agent and polycarboxylic acid, applied in the field of preparation of polycarboxylic acid water reducing agent, can solve the problems of high pollution, increased production cost, high energy consumption, etc., and achieves less equipment investment, stable product performance, and operation easy effect
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[0021] Example 1
[0022] a Prepare the configuration of the initiator
[0023] Add 100 g of vitamin C to the container, add water to dissolve, then add 1 g of trisodium phosphate and 80 g of sodium allyl sulfonate to it, continue to add water to dissolve, and configure it into a Y solution with a mass concentration of 5%. They were placed for 7 days, 15 days, 30 days, and 50 days, respectively, and were marked as Y1-1, Y1-2, Y1-3, and Y1-4.
[0024] B initiator initiates the synthesis of polycarboxylate water reducer
[0025] Add 500g of allyl polyoxyethylene ether to the reaction vessel, add 2500g of water at the same time, stir at room temperature until all dissolved, then add 1g of hydrogen peroxide, 50g of acrylic acid, and 5g of Y solution, then continue to stir and react for 1.0 hours, with a mass concentration of 30% The sodium hydroxide solution is adjusted to make its PH=7, and the obtained transparent liquid is the target product polycarboxylic acid.
[0026] Acc...
Example Embodiment
[0027] Example 2
[0028] a Prepare the configuration of the initiator
[0029] Add 100 g of sodium bisulfite to the container, add water to dissolve, then add 5 g of mercaptopropionic acid and 40 g of sodium methacrylate to it, continue to add water to dissolve, and configure it into a Y solution with a mass concentration of 7%. They were placed for 7 days, 15 days, 30 days, and 50 days, respectively, and were marked as Y2-1, Y2-2, Y2-3, and Y2-4.
[0030] B initiator initiates the synthesis of polycarboxylate water reducer
[0031] In the reaction vessel, add 500g of sodium methallyl sulfonate, add 1000g of water, stir at room temperature until all dissolved, then add 2g of potassium oxalate, 25g of lactic acid, and 8g of Y solution, and then continue to stir and react for 1.5 hours,
[0032] Adjust the PH=6 with the sodium hydroxide solution whose mass concentration is 40%, and the obtained transparent liquid is the target product polycarboxylic acid.
[0033] Change Y t...
Example Embodiment
[0034] Example 3
[0035] a Prepare the configuration of the initiator
[0036] Add 100g of hanging white pieces to the container, add water to dissolve, then add 1.5g of thioglycolic acid and 60g of 2-acrylamido-2 methylpropanesulfonic acid to it, continue to add water to dissolve, and configure it into a mass concentration of 10%. solution. They were placed for 7 days, 15 days, 30 days, and 50 days, respectively, and were marked as Y3-1, Y3-2, Y3-3, and Y3-4.
[0037] B initiator initiates synthesis of polycarboxylate water reducer
[0038] Add 500g allyl polyoxyethylene ether to the reaction vessel, add 1500g simultaneously, stir at room temperature until all dissolved, then add hydrogen peroxide 2g, maleic anhydride 40g, Y solution 6g, then continue to stir and react for 1.5 hours, with a mass concentration of 35 % sodium hydroxide solution is adjusted to make its PH=6, and the obtained transparent liquid is the target product polycarboxylic acid.
[0039] Change Y to ...
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