Design and preparation of coagulation time controllable high performance polycarboxylic acid water reducing agent
A technology of coagulation time and water reducer, which is applied in the design and preparation of polycarboxylate high-performance water reducer, can solve the problems of unstable polymerization, difficulty in controlling the quality of water reducer, and influence of polymerization, and achieve technological operation flow Simple and environmentally friendly, avoiding the effect that the quality is difficult to control
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Embodiment 1
[0084] Embodiment one: in the four-neck flask that thermometer, stirring, reflux device are arranged, add 1000g (1.0mol) polyethylene glycol monomethyl ether (molecular weight is 1000), the maleic anhydride of 98g (1.0mol), 3.294g ( 0.3%, total weight ratio) of p-toluenesulfonic acid, feed nitrogen, slowly heat up to 80-90°C, and keep warm for about 5 hours to obtain a light yellow transparent liquid. Monomer (a) is obtained.
[0085] In a four-necked flask equipped with a thermometer, agitator and reflux device, add 400g of water, 480g of monomer (a), 90g of methacrylic acid, and 30g of sodium methacrylic acid sulfonate. % ammonium persulfate solution 40g, the time is controlled at 1 hour. Then keep it at 90°C for 2 hours, cool down to 30°C, add 130g of 30% NaOH solution to neutralize to Ph=7. Measure the solid content, add water, and adjust the solid content to (25±1)%. It is called polycarboxylate superplasticizer SP-1 with a molecular weight of 38,000.
[0086] Test: A...
Embodiment 2
[0089] Embodiment two: in the four-neck flask that thermometer, stirring, reflux device are arranged, add 1200g (1.0mol) polyethylene glycol monomethyl ether (molecular weight is 1200), the maleic anhydride of 98g (1.0mol), 3.894g ( 0.3%, total weight ratio) of p-toluenesulfonic acid, feed nitrogen, slowly heat up to 80-90°C, and keep warm for about 5 hours to obtain a light yellow transparent liquid. Monomer (a) is obtained.
[0090] In a four-necked flask equipped with a thermometer, agitator and reflux device, add 400g of water, 480g of monomer (a), 90g of methacrylic acid, and 30g of sodium methacrylic acid sulfonate. % ammonium persulfate solution 40g, the time is controlled at 1 hour. Then keep it at 90°C for 2 hours, cool down to 30°C, add 130g of 30% NaOH solution to neutralize to Ph=7. Measure the solid content, add water, and adjust the solid content to (25±1)%. It is called polycarboxylate superplasticizer SP-2, and its molecular weight is 41,000.
[0091] Test:...
Embodiment 3
[0094] Embodiment three: in the four-neck flask that thermometer, stirring, reflux device are arranged, add 2000g (1.0mol) polyethylene glycol monomethyl ether (molecular weight is 2000), the maleic anhydride of 98g (1.0mol), 6.294g ( 0.3%, total weight ratio) of p-toluenesulfonic acid, feed nitrogen, slowly heat up to 80-90°C, and keep warm for about 5 hours to obtain a light yellow transparent liquid. Monomer (a) is obtained.
[0095] In a four-necked flask equipped with a thermometer, agitator and reflux device, add 400g of water, 480g of monomer (a), 90g of methacrylic acid, and 30g of sodium methacrylic acid sulfonate. % ammonium persulfate solution 40g, the time is controlled at 1 hour. Then keep it at 90°C for 2 hours, cool down to 30°C, add 130g of 30% NaOH solution to neutralize to Ph=7. Measure the solid content, add water, and adjust the solid content to (25±1)%. It is called polycarboxylate superplasticizer SP-3 with a molecular weight of 44,000.
[0096] Test:...
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