- September 17, 2021
- Posted by: admin
- Category: News
The world’s first redispersible polymer powder is vinyl acetate homopolymer powder. But this kind of polymer powder can only be used in non-alkaline systems, because esters or polymers with ester bonds react under alkaline conditions to generate free alcohols or acid salts, so that the performance changes from insoluble to water solubility, and that the increase in the glass transition temperature will lose the required elasticity, or due to other reasons. In 1960, ethylene-vinyl acetate copolymer powder (EVA) was successfully produced. EVA mainly uses ethylene, a non-saponifiable organic monomer, to internally plasticize the redispersible polymer powder, which significantly improves the flexibility of the polymer powder. The polymer powder can be used in the alkaline system of Portland cement.
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