| abstract |
The invention relates to a novel nano-styrene-acrylic emulsion and its application in the preparation of polymer waterproof mortar. The preparation method of the novel nano-styrene-acrylic emulsion of the present invention comprises the following steps: (1) pre-emulsification: first dissolve the emulsifier In an appropriate amount of deionized water, then add styrene and butyl acrylate, and emulsify for 20-30min with a high-speed shearing machine at a shear rate of 1200-2000r/min to obtain a pre-emulsion; (2) Emulsion polymerization: nitrogen Under protection, after adding acrylic acid to the pre-emulsion obtained in step ( 1 ), add an appropriate amount of NaHCO to adjust the pH to 4-5, and after heating to 75-80°C, add potassium persulfate with a mass concentration of 1%-1.5% as Initiator, after continuing to react for 1-1.5h, the reaction liquid is cooled to room temperature, and ammonia water is added to adjust the pH to 7-8, and the material is discharged to obtain the novel nano-styrene-acrylic emulsion. |