Preparation method of water reducer
A technology of water reducing agent and polymerization inhibitor, which is applied in the field of preparation of water reducing agent, can solve the problems of complicated preparation process, low water reducing rate, poor performance of water reducing agent, etc.
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[0016] A preparation method of water reducer, comprising the following steps:
[0017] 1) Mix 10-30 parts of propylene-based monomers containing amide groups, 10-30 parts of oligosaccharides containing aldehyde groups, 0.01-0.1 parts of polymerization inhibitors, and 1-10 parts of basic catalysts in 50-80 parts of water , keep warm at 30-90°C for 1-6h;
[0018] 2) Take the product obtained in the previous step, methacrylic acid, polyethylene glycol monomethyl ether methacrylate, and a free radical initiator, and react at 60-80°C for 1-3h.
[0019] The acrylic monomer containing amide group is at least one of acrylamide, methacrylamide, ethylacrylamide and dimethylacrylamide.
[0020] The oligosaccharide containing aldehyde group is at least one of glucose, maltose and dextrin.
[0021] The basic catalyst is alkali metal or alkaline earth metal hydroxide, alkali metal or alkaline earth metal carbonate, alkali metal or alkaline earth metal bicarbonate, ammonium carbonate, ammo...
Embodiment 1
[0028] 1) Put 10 parts of acrylamide, 20 parts of glucose, and 65 parts of water into the reactor. After stirring and dissolving, put in 0.02 parts of hydroquinone as a polymerization inhibitor and 5 parts of basic catalyst triethanolamine, heat up to 70 degrees, and keep warm for 3 Hour;
[0029] 2) Take 10 parts of the aqueous solution obtained in the previous step, 30 parts of methacrylic acid, 130 parts of polyethylene glycol monomethyl ether methacrylate, and carry out free radical polymerization in the presence of 0.2 parts of V-50 initiator to obtain Aqueous agent; wherein, the temperature of the polymerization reaction is 70-75°C, and the reaction time is 1-3h.
[0030] The water reducing rate of the water reducing agent for PO42.5 cement paste is 30%, and the expansion degree of cement paste is lost by 10mm in 1 hour (W / C=0.29 The amount of water reducing agent is the percentage of water reducing agent in the mass of cement: 2 %).
Embodiment 2
[0032] 1) Put 15 parts of methacrylamide, 20 parts of maltose, and 55 parts of water into the reactor. After stirring and dissolving, put 0.03 parts of polymerization inhibitor p-benzoquinone and 10 parts of basic catalyst diethanolamine, heat up to 80 degrees, and keep warm for 2 Hour;
[0033] 2) Take 10 parts of the aqueous solution obtained in the previous step, 30 parts of methacrylic acid, 130 parts of polyethylene glycol monomethyl ether methacrylate, and carry out free radical polymerization in the presence of 0.2 parts of V-50 initiator to obtain Aqueous agent; wherein, the temperature of the polymerization reaction is 70-75°C, and the reaction time is 1-3h.
[0034] The water reducing rate of the water reducing agent for PO42.5 cement slurry is 31%, and the expansion degree of cement slurry is lost by 10mm in 1 hour (W / C=0.29). The amount of water reducing agent is the percentage of water reducing agent in the mass of cement: 2 %).
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