A kind of preparation method of high-performance polycarboxylate water reducer of non-pyrogenic process
A polycarboxylic acid, high-performance technology, applied in the field of building materials, can solve problems such as environmental pollution, and achieve the effects of environmental friendliness, stable performance and high dispersion performance
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Embodiment 1
[0033] 1) Add 100 parts of allyl polyoxyethylene ether and 150 parts of water into the reaction kettle, stir to dissolve;
[0034] 2) At 5~30°C, add 2 parts of ammonium persulfate (sodium persulfate or potassium persulfate can also be used instead), and stir for half an hour;
[0035] 3) Add 2 parts of sodium hypophosphite and 1 part of 2-mercaptoacetic acid (the 2-mercaptoacetic acid can also be replaced by 3-mercaptopropionic acid) mixed solution and 10 parts of acrylic acid (the acrylic acid can also be methacrylic acid or itaconic acid) and 5 parts of methyl acrylate (the methyl acrylate can also be replaced by ethyl acrylate or butyl acrylate) mixed solution, dripping for 3 hours, aging for 1.5 hours, and finally, adding 20 parts of sodium hydroxide solution ( Potassium hydroxide, calcium hydroxide, ammonia water, sodium silicate or ethanolamine can also be used to neutralize to obtain a high-performance polycarboxylic acid mother liquor.
Embodiment 2
[0037] 1) Add 150 parts of methallyl polyoxyethylene ether and 225 parts of water into the reaction kettle, stir to dissolve;
[0038] 2) At 5~30°C, add 3 parts of hydrogen peroxide at one time and stir for half an hour;
[0039] 3) Add dropwise 1 part of sodium bisulfite (the sodium bisulfite can also be replaced by hanging white cubes), 1 part of mercaptosuccinic acid mixed solution, 30 parts of maleic acid and 5 parts of hydroxyethyl acrylate ( The hydroxyethyl acrylate can also be replaced by hydroxypropyl acrylate) mixed solution, dripping over 2 hours, aging for 1.5 hours, and finally, adding 30 parts of sodium hydroxide solution to neutralize, and then a high-performance polycarboxylic acid mother liquor can be obtained.
Embodiment 3
[0041] 1) Add 200 parts of isopentenyl polyoxyethylene ether and 300 parts of water into the reaction kettle, stir to dissolve;
[0042] 2) At 5~30°C, add 0.5 parts of azobisisobutylimidazoline hydrochloride (azobisisobutylamidine hydrochloride or azobiscyanovaleric acid can also be substituted) at one time, and stir half an hour;
[0043] 3) Add dropwise 1 part of sodium thiosulfate (the sodium thiosulfate can also be replaced by L-ascorbic acid or ferrous sulfate), 1 part of mercaptosuccinic acid mixed solution, 30 parts of crotonic acid and 5 parts of acrylic acid hydroxyl Ethyl ester mixed solution, dripped for 2 hours, matured for 1.5 hours, and finally, added 35 parts of sodium hydroxide solution to neutralize, and then the high-performance polycarboxylic acid mother solution can be obtained.
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