Preparation method of pH responsive polycarboxylic acid of comb-shaped structure
A comb-like structure, polycarboxylic acid technology, applied in the field of pH-responsive polycarboxylic acid for cement concrete, achieves the effects of low energy consumption, easy industrial production and low price
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Embodiment 1
[0034] First, 90g of N,N-dimethylformamide, 30g of ethyl acrylate and 32.75g of isooctyl 3-mercaptopropionate were added to the reactor, stirred and heated to 60°C, then 5.96g of azobisisoheptanonitrile was added dropwise Mix the solution with 8.94g N,N-dimethylformamide for 10 hours, and continue to react at a constant temperature of 60°C for 5 hours after the dropwise addition to obtain a polyethylacrylate solution of the self-polymerized product; adjust the temperature of the obtained self-polymerized product to 60°C , add 24.29g of tert-dodecyl mercaptan and stir for 35 minutes until it is evenly mixed, then add dropwise 377.31g of dimethylaminoethyl methacrylate, 29.80g of azobisisoheptanonitrile and 44.71g of N,N-dimethyl Dimethylformamide mixed solution for 10 hours, continue to react at constant temperature at 60°C for 5 hours after the dropwise addition, and then distill under reduced pressure to remove N,N-dimethylformamide to obtain graft copolymerization product; 40...
Embodiment 2
[0036] First, 30g of tetrahydrofuran, 30g of methyl acrylate and 12.54g of isopropanol were added to the reactor, stirred and heated to 50°C, and then a mixed solution of 2.86g of azobisisobutyronitrile and 2.86g of tetrahydrofuran was added dropwise for 12 hours. After the addition, continue to react at a constant temperature of 50°C for 6 hours to obtain a self-polymerized product polymethyl acrylate solution; adjust the temperature of the obtained self-polymerized product to 50°C, add 35.22g of n-dodecyl mercaptan and stir for 40 minutes until it is mixed Evenly, add dropwise a mixed solution of 498.27g dimethylaminoethyl acrylate, 28.57g azobisisobutyronitrile and 28.57g tetrahydrofuran for 12 hours, continue to react at a constant temperature of 50°C for 6 hours after the dropwise addition, and then distill under reduced pressure to remove Tetrahydrofuran to obtain graft copolymerization product; mix 528.27g graft copolymerization product with 62.64g deionized water, stir ...
Embodiment 3
[0038] First, 270g dimethyl sulfoxide, 30g amyl acrylate and 1.27g isopropanol were added to the reactor, stirred and heated to 70°C, then 6.56g tert-butyl peroxybenzoate and 59.02g dimethyl Mix the solution of sulfoxide for 8 hours, continue to react at a constant temperature of 70°C for 4 hours after the dropwise addition, and obtain a polyamyl acrylate solution of the self-polymerized product; adjust the temperature of the obtained self-polymerized product to 80°C, and add 32.03g of n-dodecyl Mercaptan and stirred for 25 minutes until it is evenly mixed, then add dropwise a mixed solution of 66.55g 4-vinylpyridine, 19.67g tert-butyl peroxybenzoate and 177.04g dimethyl sulfoxide for 6 hours, and continue to keep the temperature after the dropwise addition React at 80°C for 3 hours, then distill off dimethyl sulfoxide under reduced pressure to obtain a graft copolymerization product; mix 96.55g of graft copolymerization product with deionized water, stir and raise the temperat...
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