Preparation method of thermally expandable microspheres with controllable particle size

Abstract

The invention discloses a preparation method of thermally expandable microspheres with controllable particle size. The preparation method comprises the steps of aqueous phase preparation, oil phase preparation, membrane emulsification and in-situ polymerization reaction. After the in-situ polymerization reaction is finished, a reaction solution is subjected to vacuum suction filtration, the product is washed with a solvent, the washed wet material is dried in a vacuum drying oven, and the dried material is crushed. According to the method, through selection of membrane materials and membrane pore diameters and control of membrane particle size distribution, the emulsified microspheres with controllable particle size and narrow particle size distribution are obtained, and then the thermallyexpandable microspheres with controllable particle size are obtained through in-situ polymerization reaction. The membrane emulsification mode is low in energy consumption, low in investment cost andbeneficial to industrialized production, the obtained thermally expandable microspheres are controllable in particle size and narrow in particle size distribution, the particle size distribution range is controlled within 15 [mu]m, and the quantitative requirements of different customers can be met.

Description

technical field [0001] The invention relates to a method for preparing heat-expandable microspheres with controllable particle size, which can obtain heat-expandable microspheres with controllable average particle size and narrow particle size distribution by improving emulsification efficiency. Background technique [0002] Heat-expandable microspheres are microspheres with a thermoplastic polymer shell and an alkane blowing agent with a lower boiling point as the core material. Under the action of heat, the thermoplastic polymer shell softens, and the core alkane blowing agent vaporizes. Internal pressure is generated, and the microspheres expand under the action of the internal pressure. When the internal pressure after expansion of the core material is balanced with the pressure on the thermoplastic shell, the expansion of the microspheres is completed, and then foamed microspheres are formed. [0003] 关于热膨胀性微球的制备方法在中国专利CN102203205B、CN102070868A、CN101346218A、CN101087811B...

AI Technical Summary

Problems solved by technology

In order to obtain microspheres with different particle sizes in the market, it needs to be sieved, which increases equipment investment and production costs, and also affects production efficiency.