Preparation method of anti-mud polycarboxylic water reducer
A polycarboxylate-based, mud-resistant technology, which is applied in the field of mud-resistant polycarboxylate-based water reducers and the preparation of polycarboxylate-based water-reducers, can solve the problems of insufficient concrete water reduction, large slump loss, Without increasing the dosage and other problems, it can achieve the effect of enhancing steric hindrance, low equipment requirements, and increasing water reducing rate
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Embodiment 1
[0023] (1) Preparation of quaternary ammonium salt oligomers: add 137 parts by weight of epibromohydrin, 400 parts by weight of The water of ethanol and 98.2 parts by weight; Nitrogen replacement is carried out to reaction vessel under stirring condition and be heated to 30~35 ℃ under nitrogen atmosphere, then slowly add the trimethylamine solution (30%) of 236 parts by weight dropwise in 1 hour, and stir at low speed; add 23 parts by weight of phosphoric acid to adjust the pH value of the system to 1 to 2, add 0.8 parts by weight of ammonium persulfate, 5 parts by weight of sodium hypophosphite and a composite initiator solution composed of 100 parts by weight of water, and then heat up to 65 ~70°C reaction stopped after 5.5 hours. The reaction solution was distilled under reduced pressure at 70kPa vacuum degree and 90°C to obtain light yellow viscous quaternary ammonium salt oligomer PQA-1.
[0024] (2) Preparation of mud-resistant polycarboxylate water reducer: add 19.2 pa...
Embodiment 2
[0026] (1) Preparation of quaternary ammonium salt oligomers: add 137 parts by weight of epibromohydrin, 200 parts by weight of The water of Virahol and 165.2 parts by weight; Nitrogen replacement is carried out to reaction vessel under stirring condition and be heated to 30~35 ℃ under nitrogen atmosphere, then the triethylamine solution (30 parts by weight) of 370 parts by weight is slowly added dropwise in 1.5 hours %), and low-speed stirring; Add the phosphoric acid adjustment system pH value 1~2 of 21 weight parts, add the composite initiator solution that the potassium persulfate of 0.8 weight part, the sodium bisulfite of 6 weight parts and 100 weight parts water form, Then the temperature was raised to 65-70° C. and the reaction was stopped for 7 hours. The reaction solution was distilled under reduced pressure at 70kPa vacuum degree and 90°C to obtain light yellow viscous quaternary ammonium salt oligomer PQA-2.
[0027](2) Preparation of mud-resistant polycarboxylate...
Embodiment 3
[0029] (1) Preparation of quaternary ammonium salt oligomers: add 137 parts by weight of epibromohydrin, 340 parts by weight of Methanol and 112 parts by weight of water; the reaction vessel is replaced with nitrogen under agitation and heated to 30-35°C under a nitrogen atmosphere, and then 292 parts by weight of diethylamine solution (30%) is slowly added dropwise within 1.5 hours , and stir at a low speed; add 11 parts by weight of concentrated sulfuric acid to adjust the pH value of the system to 1 to 2, add 1 part by weight of sodium persulfate, 7 parts by weight of sodium sulfite and a composite initiator solution composed of 100 parts by weight of water, then heat up to 65 The reaction stopped at ~70°C for 6 hours. The reaction solution was distilled under reduced pressure at 70kPa vacuum degree and 90°C to obtain light yellow viscous quaternary ammonium salt oligomer PQA-3.
[0030] (2) Preparation of mud-resistant polycarboxylate-based water reducer: add 22.5 parts b...
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