Compound polycarboxylate superplasticizer and preparation method thereof
A technology of water reducing agent and polycarboxylic acid, which is applied in the field of compound polycarboxylate water reducing agent and its preparation, can solve the problems of reduced comprehensive performance of concrete, poor mud resistance, easy insertion, etc., and achieves no toxic side effects and stable properties. , the effect of increasing the physical size
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[0045] Example 1
[0046]The hydroxyl-terminated polyether macromonomer of Example 1 is obtained by esterification of the terminal hydroxyl group of the polyether macromonomer with the carboxyl group of the macromolecular carboxylic acid under the catalysis of the catalyst; the polyether The molar ratio of macromonomer to macromolecular carboxylic acid is 1:0.2~1; the reaction temperature of the esterification reaction is 80°C~130°C. Wherein the polyether macromonomer adopts isopentenyl polyoxyethylene ether (TPEG) or isobutenyl polyoxyethylene ether (HPEG). Specifically, the catalyst can be p-toluenesulfonic acid or sulfamic acid, and the amount thereof depends on the amount of the polyether macromonomer; specifically, the amount of the catalyst can be 2% of the mass of the polyether macromonomer ~6%.
[0047] Specifically, the catalyst adopts p-toluenesulfonic acid or sulfamic acid.
[0048] The structural formula of the hydroxyl-terminated polyether macromonomer is as fo...
Example Embodiment
[0060] Example 2
[0061] Since the esterification reaction is a reversible reaction, if the H generated during the esterification reaction 2 The accumulation of O in the reaction vessel will accelerate its reverse reaction. Therefore, in order to improve the efficiency of the esterification reaction, on the basis of the raw material of the polyether macromonomer with terminal hydroxyl esterified in Example 1, the raw material of the polyether macromonomer with terminal hydroxyl esterification in Example 2 was also added A water-carrying agent is used, and the dosage of the water-carrying agent is 10% to 20% of the mass of the polyether macromonomer. Specifically, cyclohexane can be used.
[0062] Further, in order to prevent the double bond polymerization of the reaction raw material polyether macromonomer in the reaction process, a polymerization inhibitor is also added in the esterification reaction; 0.05% to 0.5% of the mass. Specifically, hydroquinone, phenothiazine, ...
Example Embodiment
[0066] Example 3
[0067] The mother liquor of polycarboxylate water-reducing agent is obtained by mixing the hydroxyl-terminated polyether macromonomer described in Example 1 with water, an initiator, a chain transfer agent and acrylic acid after mixing and heating, and then adding it to an alkaline solution. and obtained after the pH value reached 6-7.
[0068] The mixing ratio of the hydroxyl-terminated polyether macromonomer and water, initiator, chain transfer agent and acrylic acid adopted in the polycarboxylate water reducing agent mother liquor of the present invention adopts the existing mixing ratio, and the existing initiator , chain transfer agent. However, as an example, the present Example 3 provides the specific ratio, but it cannot limit the polycarboxylate water-reducing agent mother liquor of the present invention.
[0069] The molar ratio of water, initiator, chain transfer agent and acrylic acid used in Example 3 to the molar ratio of the hydroxyl-termina...
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