Preparation method of acrylic ester emulsion

Abstract

The invention discloses a preparation method of acrylic ester emulsion, which is realized by the following steps: 1. adding quantitative water, a monomer, an emulsifier and a crosslinker into a reactor and stirring; 2. adding an oxidant and stirring; 3. adding a reducing agent and a stabilizer and continuously stirring, controlling temperature to rise, self-warming through monomer polymerizing heat releasing, and starting heat preservation; and 4. adding hydrogen peroxide and tert-butyl hydroperoxide, keeping heat preservation, reducing the temperature below 45 DEG C, neutralizing to lead the pH to be 6.8-7 by ammonia water, and filtering and discharging, thus obtaining the acrylic ester emulsion. Compared with the prior art, the method adopts an one-off feeding technological scheme, improves the work efficiency and product stability, saves energy and reduces environmental pollution by adopting low-temperature oxidation reduction reaction, can obtain higher molecular weight through low-temperature reaction, and improves the product quality and environmental performance.

Description

technical field [0001] The present invention relates to the preparation method of acrylate emulsion. Background technique [0002] In the prior art, the preparation methods of acrylate emulsion mainly include redox method and semi-continuous emulsion polymerization process. [0003] Among them, the redox method is to add emulsifier, buffer, oxidant, part of acrylate mixed monomer and part of deionized water into the reaction kettle; stir, heat to polymerization temperature of 40°C, pre-emulsify for 30 minutes, and then add the remaining monomers dropwise And reducing agent, heated to 50 ℃ -60 ℃ constant temperature polymerization 4h. Then heat up to 70°C-75°C, keep warm for 1h, stop stirring, cool to room temperature, add ammonia water, adjust PH=7-8, and discharge. Its disadvantages are large energy consumption, long dripping time, complicated process and poor product stability. [0004] The semi-continuous emulsion polymerization process is to inject monomers such as bu...

AI Technical Summary

Problems solved by technology

Its disadvantages are polymerization under higher temperature conditions, high energy consumption, relatively low product molecular weight, long dripping time, complicated process, and poor product stability.