Polycarboxylic additive and preparation method thereof
An admixture, polycarboxylic acid technology, applied in the field of concrete water-reducing agent, can solve the problems of cement bleeding and hardening, fast slump loss, and poor adaptability of sand and gravel, so as to save costs, reduce slump loss, and maintain good collapse effect
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Embodiment 1
[0020] A kind of polycarboxylate additive, comprises by weight:
[0021] Methacryl polyoxyethylene ether: 400 parts,
[0022] Maleic anhydride: 15 parts,
[0023] Solution A: mercaptopropionic acid: 2 parts, ascorbic acid: 1 part, deionized water: 90 parts;
[0024] Solution B: hydroxyethyl ester: 35 parts, fumaric acid: 8 parts, hydrogen peroxide: 1 part, deionized water: 70 parts.
[0025] The preparation method of polycarboxylic acid admixture comprises the following steps:
[0026] (1) Put methacryl polyoxyethylene ether and maleic anhydride in parts by weight into the reactor, then add deionized water and stir until fully dissolved, and heat up to 55-60°C for later use;
[0027] (2), raise the temperature in the reaction kettle in step (1) to 60-63°C, start to add the A solution dropwise, and after 30 minutes, add the B solution dropwise; wherein the A solution and the B solution are evenly added dropwise to the reaction kettle, The dropping time is controlled as 150 ...
Embodiment 2
[0030] A kind of polycarboxylate additive, comprises by weight:
[0031] Methacryl polyoxyethylene ether: 380 parts,
[0032] Maleic anhydride: 15 parts,
[0033] Solution A: mercaptopropionic acid: 1 part, ascorbic acid: 0.5 part, deionized water: 80 parts;
[0034] Solution B: hydroxyethyl ester: 30 parts, fumaric acid: 5 parts, hydrogen peroxide: 1 part, deionized water: 70 parts.
[0035] The preparation method of polycarboxylic acid admixture comprises the following steps:
[0036] (1) Put methacryl polyoxyethylene ether and maleic anhydride in parts by weight into the reactor, then add deionized water and stir until fully dissolved, and heat up to 55-60°C for later use;
[0037] (2), raise the temperature in the reaction kettle in step (1) to 60-63°C, start to add the A solution dropwise, and after 30 minutes, add the B solution dropwise; wherein the A solution and the B solution are evenly added dropwise to the reaction kettle, The dropping time is controlled as 150...
Embodiment 3
[0040] A kind of polycarboxylate additive, comprises by weight:
[0041] Methacryl polyoxyethylene ether: 400 parts,
[0042] Maleic anhydride: 15 parts,
[0043] Solution A: mercaptopropionic acid: 2 parts, ascorbic acid: 1 part, deionized water: 80 parts;
[0044] Solution B: hydroxyethyl ester: 25 parts, fumaric acid: 4 parts, hydrogen peroxide: 2 parts, deionized water: 60 parts.
[0045] The preparation method of polycarboxylic acid admixture comprises the following steps:
[0046] (1) Put methacryl polyoxyethylene ether and maleic anhydride in parts by weight into the reactor, then add deionized water and stir until fully dissolved, and heat up to 55-60°C for later use;
[0047] (2), raise the temperature in the reaction kettle in step (1) to 60-63°C, start to add the A solution dropwise, and after 30 minutes, add the B solution dropwise; wherein the A solution and the B solution are evenly added dropwise to the reaction kettle, The dropping time is controlled as 150...
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