Polycarboxylate water reducer with small temperature sensibility
A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent, can solve the problems such as no involvement, and achieve the effects of avoiding rearrangement, small slump loss and high water reducing rate.
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Embodiment 1
[0027] A polycarboxylate water-reducer with little temperature sensitivity, comprising 10 parts by weight of methacrylic acid, 1 part of alkaline catalyst sodium hydroxide, 60 parts of antifreezing agent calcium chloride, and the free radical initiator is AIBN. .1 part, 30 parts of acrylic acid, 150 parts of polyethylene glycol monomethyl ether and 10 parts of pozzolan.
[0028] The preparation method is: (1) Add acrylic acid, AIBN and water into a four-necked flask, stir and heat up to 70°C, add methacrylic acid, reducing agent, acrylic acid and AIBN dropwise, react for 2 hours, add water to obtain a solid content of 55 % viscous polymer liquid;
[0029] (2) Add polyethylene glycol monomethyl ether and alkaline catalyst sodium hydroxide to the viscous polymer liquid prepared in step (1) and stir. The reaction temperature is 100° C., and the reaction time is 4 hours. Vacuum, keep the vacuum at 5000Pa, after the reaction is completed, cool to below 60°C to prepare an ester pol...
Embodiment 2
[0032] A polycarboxylate water reducer with little temperature sensitivity, comprising 15 parts by weight of methacrylic acid, 3 parts of alkaline catalyst sodium hydroxide, 70 parts of antifreeze methanol, and the free radical initiator is AIBN0.15 50 parts of acrylic acid, 200 parts of polyethylene glycol monomethyl ether and 15 parts of volcanic ash.
[0033] The preparation method is: (1) Add acrylic acid, AIBN and water into a four-necked flask, stir and heat up to 70°C, add methacrylic acid, reducing agent, acrylic acid and AIBN dropwise, react for 3 hours, add water to obtain a solid content of 63 % viscous polymer liquid;
[0034] (2) Add polyethylene glycol monomethyl ether and alkaline catalyst sodium hydroxide to the viscous polymer liquid prepared in step (1) and stir. The reaction temperature is 110°C, and the reaction time is 6 hours. Vacuum, keep the vacuum at 5000Pa, after the reaction is completed, cool to below 60°C to prepare an ester polycarboxylate water ...
Embodiment 3
[0037]The difference from Example 2 is that a polycarboxylate water reducer with little temperature sensitivity includes 20 parts by weight of methacrylic acid, 5 parts of basic catalyst diethanolamine, and 75 parts of antifreeze methanol. The base initiator is 0.15 parts of AIBN, 50 parts of acrylic acid, 200 parts of polyethylene glycol monomethyl ether and 15 parts of pozzolan.
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