Preparation method of super-retarding type polycarboxylate superplasticizer
A technology of retarded polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of affecting the use of products, increase production cost, low reactivity, etc., and achieve the effects of improving production efficiency, thorough reaction and good reactivity
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[0023] Example 1
[0024] (1) Copolymerization reaction: add 100.00g APEG (molecular weight 800-3000) and 136.00g water into the reactor, turn on the stirring, and gradually increase the temperature. When the stirring is uniform and the temperature rises to 60℃, start to add maleic anhydride, A mixed aqueous solution of sodium methacrylic acid, vinylphosphonic acid and thioglycolic acid (among which maleic anhydride 5.00g, sodium methacrylic acid 6.27g, vinylphosphonic acid 7.70g, thioglycolic acid 0.85g, water 15.00g) After reacting with an aqueous solution of ammonium persulfate (1.43g of ammonium persulfate and 30.00g of water) at 60°C for 3 hours, a copolymerized product was obtained.
[0025] (2) Neutralization reaction: adjust the pH to 6-7 with sodium hydroxide to obtain a super retarding polycarboxylic acid water reducer.
Example Embodiment
[0026] Example 2
[0027] (1) Copolymerization reaction: add 100.00g TPEG (molecular weight 800-3000) and 132.00g water into the reactor, turn on the stirring, gradually increase the temperature, when the stirring is uniform and the temperature rises to 55℃, start to add acrylic acid and vinyl respectively A mixed aqueous solution of sodium sulfonate, diethyl vinylphosphonate and mercaptopropionic acid (including 8.69 g of acrylic acid, 2.50 g of sodium vinyl sulfonate, 9.33 g of diethyl vinyl phosphonate, 0.98 g of mercaptopropionic acid, and water 15.00 g) After reacting with an aqueous solution of ammonium persulfate (1.37g of ammonium persulfate and 30.00g of water) at 60°C for 4 hours, a copolymerized product is obtained.
[0028] (2) Neutralization reaction: adjust the pH to 6-7 with sodium hydroxide to obtain a super retarding polycarboxylic acid water reducer.
Example Embodiment
[0029] Example 3
[0030] (1) Copolymerization reaction: add 50.00g HPEG (molecular weight 800-3000), 50.00g TPEG (molecular weight 800-3000) and 450.00g water into the reactor, turn on the stirring, gradually increase the temperature, wait until it is evenly stirred and the temperature rises to 65°C When, start to add acrylic acid, sodium styrene sulfonate, vinyl phosphonic acid, diethyl vinyl phosphonate, phosphonic acid-β-styryl ester and mercaptopropionic acid mixed aqueous solution (including acrylic acid 7.80g, ethylene Sodium sulfonate 6.50g, vinylphosphonic acid 2.92g, vinyl diethyl phosphonate 3.00g, phosphonic acid-β-styryl ester 2.08g, mercaptopropionic acid 1.11g, water 15.00g) and potassium persulfate The aqueous solution (including 0.83 g of potassium persulfate and 30.00 g of water) was reacted at 60°C for 5 hours to obtain a copolymer product.
[0031] (2) Neutralization reaction: adjust the pH to 6-7 with sodium hydroxide to obtain a super retarding polycarboxylic...
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