Application of early-strength viscosity-reducing polycarboxylate water reducer in the preparation of prefabricated concrete
A technology of concrete and polycarboxylate, which is applied in the field of early-strength viscosity-reducing polycarboxylate superplasticizer to prepare prefabricated concrete, which can solve the problems of concrete strength shrinkage, early strength low viscosity, retardation and high viscosity, etc. Achieve the effects of fast early strength, low shrinkage and environmental protection
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Embodiment 1
[0067] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:
[0068] (1) Synthesis of viscosity-reducing active macromonomer D:
[0069] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and drop 30 mol of ring The oxyalkane was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.
[0070] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer
[0071] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent in water to obtain solution 2, and dissolve the reducin...
Embodiment 2
[0075] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:
[0076] (1) Synthesis of viscosity-reducing active macromonomer D:
[0077] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol and 2 g of sodium hydride, stir under nitrogen protection, and add 30 mol dropwise at a constant speed at 90 ° C. , Ethyl 3-epoxy 3-phenylpropionate was added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.
[0078] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer
[0079] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent ...
Embodiment 3
[0083] The preparation method of the early-strength viscosity-reducing polycarboxylate superplasticizer of the present invention, the preparation method comprises the following steps:
[0084] (1) Synthesis of viscosity-reducing active macromonomer D:
[0085] In a four-necked glass flask equipped with a stirrer, a thermometer, a reflux condenser, and a dropping device, add 1 mol of methallyl alcohol, 2 g of sodium hydride, stir under nitrogen protection, and dropwise add 15 mol of ring Oxyalkane and 15mol ethyl 2,3 epoxy 3-phenylpropionate were added dropwise in 3 hours, and the reaction was continued at 100°C for 8 hours to obtain the viscosity-reducing active macromonomer D.
[0086] (2) Synthesis of early-strength viscosity-reducing polycarboxylate superplasticizer
[0087] Dissolve reactive monomer B, reactive monomer C, reactive monomer D, reactive monomer E, and an oxidizing agent in water to obtain solution 1, dissolve reactive monomer A and chain transfer agent in wa...
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