Application of early-strength viscosity-reducing type polycarboxylic acid water-reducing agent in preparation of prefabricated member concrete
A technology of concrete and water reducer, which is applied in the field of early-strength viscosity-reducing polycarboxylate water-reducer to prepare prefabricated concrete, which can solve the problems of retardation and high viscosity, low early strength viscosity, and poor durability.
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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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