Preparation method of amine-ester slow-setting polycarboxylic acid type water-reducer
A slow-coagulation carboxylic acid and water-reducing agent technology, which is applied in the field of polycarboxylic acid-based water-reducing agents, can solve the problems of complicated process methods, difficult realization, and easy thermal polymerization, etc., and achieve abundant raw material sources, rapid response, and easy engineering operation Effect
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Embodiment 1
[0030] 1) Preparation of hydroxyl-containing copolymerization product: 10 mol 2-methallyl alcohol, 9 mol acrylic acid and 1 mol sodium methoxyallyl sulfonate at 6°C in 1 mol benzoyl peroxide, 2 mol ferrous pyrophosphate, 0.01 mol Oxidation-reduction radical polymerization was carried out under the action of thioglycolic acid for 30 minutes to obtain a copolymer product with a molecular weight of 2000;
[0031] 2) Preparation of polyethylene glycol monomethyl ether monoisocyanate: Add 10 mol of polyethylene glycol monomethyl ether with a molecular weight of 400 to 10.5 mol excess toluene diisocyanate (TDI) at 0°C under a nitrogen atmosphere. - under the effect of dimethylcyclohexylamine, reaction under reduced pressure distillation obtains polyethylene glycol monomethyl ether monoisocyanate after reaction 10min;
[0032]3) Preparation of urethane type retarding water reducer: add 10 mol of hydroxyl-containing copolymerization product to 10 mol polyethylene glycol monomethyl eth...
Embodiment 2
[0034] 1) Preparation of hydroxyl-containing copolymerization product: 10 mol hydroxyethyl acrylate, 1 mol methacrylic acid and 1 mol potassium allyl sulfonate were mixed at 45°C in 0.9 mol benzoyl peroxide, 1.8 mol N,N-diethylaniline, Under the action of 0.1mol 2-mercaptopropionic acid, oxidation-reduction radical polymerization was carried out for 40 minutes to obtain a copolymer product with a molecular weight of 2500;
[0035] 2) Preparation of polyethylene glycol monomethyl ether monoisocyanate: Add 10 mol of polyethylene glycol monomethyl ether with a molecular weight of 450 to 10.1 mol of excess hexamethylene diisocyanate (HDI) at 8°C under a nitrogen atmosphere. Under the effect of mol bis(2-dimethylaminoethyl) ether, reaction under the effect of 40min underpressure distillation obtains polyethylene glycol monomethyl ether monoisocyanate;
[0036] 3) Preparation of urethane-type retarding water reducer: add 10mol of hydroxyl-containing copolymer product to 20mol of pol...
Embodiment 3
[0038] 1) Preparation of hydroxyl-containing copolymer products: 10mol hydroxyethyl methacrylate, 5mol sodium acrylate at 45°C in 0.8mol hydrogen peroxide, 1.6mol ferrous sulfate, 0.05mol 3-mercaptopropionic acid for oxidation-reduction freedom Based polymerization reaction 50min obtains the copolymerization product that molecular weight is 3000;
[0039] 2) Preparation of polyethylene glycol monomethyl ether monoisocyanate: 10 mol of polyethylene glycol monomethyl ether with a molecular weight of 500 was added to 10.2 mol of excess isophorone diisocyanate (IPDI) under an argon atmosphere at 6°C. Under the action of 0.07mol N,N,N',N'-tetramethylalkylenediamine, reacted for 30min and then distilled under reduced pressure to obtain polyethylene glycol monomethyl ether monoisocyanate;
[0040] 3) Preparation of urethane-type retarding water reducer: 10 mol of hydroxyl-containing copolymerization product obtained in step 1) was added to 20 mol of polyethylene glycol monomethyl eth...
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