EUROPEAN COATINGS SHOW 2025
March 13th 2025
We use cookies to help you navigate efficiently and perform certain functions. You will find detailed information about all cookies under each consent category below.
The cookies that are categorized as "Necessary" are stored on your browser as they are essential for enabling the basic functionalities of the site. ...
Necessary cookies are required to enable the basic features of this site, such as providing secure log-in or adjusting your consent preferences. These cookies do not store any personally identifiable data.
Functional cookies help perform certain functionalities like sharing the content of the website on social media platforms, collecting feedback, and other third-party features.
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics such as the number of visitors, bounce rate, traffic source, etc.
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Advertisement cookies are used to provide visitors with customized advertisements based on the pages you visited previously and to analyze the effectiveness of the ad campaigns.
Vinyl acetate and ethylene are copolymerized in an emulsion process to first produce VAE compositions containing between 10 and 40 percent ethylene in the copolymer. Ethylene is a soft, hydrophobic monomer unit in the copolymers, functioning as an internal “plasticizing” moiety. In copolymers, ethylene effectively reduces the glass transition temperature (Tg) of the hard, polar vinyl acetate monomer, which has a Tg of 30 °C. Thus, we can achieve copolymers with Tgs ranging from +15 °C to minus 15 °C while converting the base emulsion resins used in the production of the VAE into redispersible powders. By using ethylene monomer to adjust the Tg, the formulator does not require any external plasticizers.
We’ve depicted the manufacturing process for redispersible powders below. Starting with a VAE emulsion produced using a colloid stabilizer like polyvinyl alcohol, the emulsion is mixed with a fine mineral anti-caking agent and then spray-dried. This affords a stable, free-flowing powder which can be redispersed when mixed with water. The RDP’s minimum solid’s content is 98 percent; the level of anti-caking agent content is up to 8-12 percent of the total weight. These VAE’s have very low amounts of volatile organic compounds (VOCs) and low odor levels.
The picture below shows the free-flowing nature of the VAE-RDP. The SEM micrograph shows a VAE solid particle. The anti-caking agent or partitioning agent also appears in the SEM. The graph on the right shows the particle size dimensions (um) and number average distribution of the original VAE emulsion (red line) and the powder when redispersed into water (blue line). Noteworthy is the retention of the dimensions of the original VAE emulsion particle, after redispersing the powder. The blue hump in the graph is associated with the anti-caking agent.
Tags:
Arabic
Chinese (Simplified)
Dutch
English
French
German
Hindi
Italian
Portuguese
Russian
Spanish
Urdu