Slump retaining type polycarboxylic acid water reducing agent, and preparation method and application thereof
A technology of polycarboxylic acid and water reducing agent, which is applied in the field of building materials, can solve the problems of retarder and cement compatibility, concrete quality hazards, complex operation procedures, etc., and achieve good slump retention and reaction conditions Simple and easy to control, excellent dispersion performance
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Embodiment 1
[0017] In the embodiment of the present invention, a slump-retaining polycarboxylate water reducer is composed of the following raw materials in parts by weight: 27 parts of polymethacrylic acid, 1 part of polyepoxysuccinic acid, 7 parts of casein, polyethylene glycol 5 parts of ethylene glycol ester, 3 parts of calamine.
[0018] Mix casein with 1% sodium hydroxide solution by mass to prepare a casein solution, wherein the mass ratio of casein to sodium hydroxide solution is 1:3.5. Crush the calamine, pass through a 100-mesh sieve, add anhydrous ethanol 4 times its mass, stir at a temperature of 52°C for 12 minutes, then add polyepoxysuccinic acid, stir at a temperature of 65°C for 20 minutes, and then Add casein solution and stir at 76°C for 30 minutes, add polymethacrylic acid and polyethylene adipate, seal and stir at 80°C for 40 minutes, then ultrasonicate at 68°C Treat for 20 minutes with an ultrasonic power of 800W, then centrifuge at a speed of 3000r / min for 5 minutes...
Embodiment 2
[0020] In the embodiment of the present invention, a slump-retaining polycarboxylate water reducer is composed of the following raw materials in parts by weight: 35 parts of polymethacrylic acid, 5 parts of polyepoxysuccinic acid, 15 parts of casein, polyethylene glycol 12 parts of ethylene glycol ester, 10 parts of calamine.
[0021] Mix casein with 1% sodium hydroxide solution by mass to prepare a casein solution, wherein the mass ratio of casein to sodium hydroxide solution is 1:3.5. Pulverize the calamine, pass through a 100-mesh sieve, add anhydrous ethanol 4 times its mass, stir at a temperature of 52°C for 15 minutes, then add polyepoxysuccinic acid, stir at a temperature of 65°C for 20 minutes, and then Add casein solution, and stir at 76°C for 30 minutes, add polymethacrylic acid and polyethylene adipate, seal and stir at 80°C for 45 minutes, and then sonicate at 68°C Treat for 20 minutes with an ultrasonic power of 800W, then centrifuge at a speed of 3000r / min for 5...
Embodiment 3
[0023] In the embodiment of the present invention, a slump-retaining polycarboxylate water reducer is composed of the following raw materials in parts by weight: 29 parts of polymethacrylic acid, 2 parts of polyepoxysuccinic acid, 9 parts of casein, polyethylene glycol 7 parts of ethylene glycol esters, 5 parts of calamine.
[0024] Mix casein with 1% sodium hydroxide solution by mass to prepare a casein solution, wherein the mass ratio of casein to sodium hydroxide solution is 1:3.5. Crush the calamine, pass through a 100-mesh sieve, add anhydrous ethanol 4 times its mass, stir at a temperature of 52°C for 13 minutes, then add polyepoxysuccinic acid, stir at a temperature of 65°C for 20 minutes, and then Add casein solution, stir at 76°C for 30 minutes, add polymethacrylic acid and polyethylene adipate, seal and stir at 80°C for 42 minutes, and then ultrasonicate at 68°C Treat for 20 minutes with an ultrasonic power of 800W, then centrifuge at a speed of 3000r / min for 5 minu...
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