Styrene-acrylic Polymers
Styrene-acrylic emulsion polymers are based on a group of chemicals that are true workhorses in the field of polymer chemistry. Known as acrylates, this group includes acrylic acid and its esters — methyl acrylate, butyl acrylate, ethyl acrylate, and 2-ethylhexyl acrylate. All of these acrylic monomers are highly reactive chemicals, which means they readily combine with themselves or other monomers to form commercially important polymers. One of the most important polymer reactions, occurring via emulsion polymerization, involves acrylic-based monomers combining with styrene to form a styrene-acrylic emulsion polymer. The versatility of this class of polymers owes much to the wide-ranging family of acrylic monomers, which, when combined with styrene, can build random copolymers with specific glass transition temperatures (Tg). Styrene-acrylic polymer emulsions are ubiquitous in every market where water-based systems are used because of the array of specific properties that can be achieved.
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In addition to versatility, cost is another significant advantage. The price of styrene is lower than chemicals found in the acrylate family. That makes styrene-acrylic polymers cost-effective alternatives to pure acrylics.
Desirable Properties of Styrene Acrylic Polymers
Styrene-acrylic polymers offer excellent hydrophobic characteristics, which means they have superior water resistance and moisture vapor transmission rate (MVTR) when compared to all-acrylic polymers. Also, styrene itself is a hydrophobic monomer, making it possible to produce styrene-acrylic polymers with low particle sizes. This results in polymers that are ideal for certain applications, such as primers for the construction industry or binders for paper coatings.
Another important property of styrene-acrylic polymers is their high glass transition temperature. As a result, they tend to be durable and exhibit good abrasion resistance and good mechanical properties. Other properties of styrene-acrylic emulsion polymers include:
- Good weatherability and good stain resistance
- Broad tensile/elongation balance
- Ability to crosslink
- High pigment-binding capacity
- Ideal gloss, film strength, and resistance to removal by detergents
- Good adhesion to common substrates, including galvanized steel, aluminum and wood
One drawback of styrene-acrylic polymers is the tendency to yellowing from direct sunlight exposure. In fact, as styrene content increases, yellowing increases, though other factors can also have an effect. For example, free radical initiators from polymerization of styrene-acrylic copolymers may influence the degree of yellowing in the final product.
Despite these drawbacks, styrene acrylic polymers are still widely used in construction products, such as ceramic tile adhesives, fillers, putties and elastomeric roof coatings. They are also used in glass-fiber secondary binder applications, such as wall coverings, and architectural decorative coatings.
Resin Supported Emulsions
Resin supported emulsions (RSE) are a subset of styrene-acrylic emulsion polymers. These emulsions are built on an alkali soluble resin, resulting in an emulsion with low minimum film formation temperature (MFFT) relative to the polymer’s glass transition temperature. RSE products have flexibility and a range of applications similar to traditional styrene-acrylic emulsion polymers. They are often chosen because they have high gloss, high mechanical stability and high pigment and filler binding/loading. Plus, the rheology of RSEs is more Newtonian, which means their viscosity is less dependent on shear rate.
MCP: Your Partner for Styrene Acrylic Emulsions
Mallard Creek Polymers can work with you to find an existing styrene-acrylic emulsion polymer that fits your end use — or develop a new one. Check out our Guide to Tailoring an Emulsion Polymer Recipe or contact us today to discuss what we can make for you.
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10 Things to Consider When Buying SODIUM CUMENESULFONATE priceComparing Sanding Disc Backings: (Cloth, Film, Hook & ...Pure acrylic and styrene acrylic are both paint formulations used in a wide range of applications, including paint and coatings, craft projects, and DIY home projects, like interior and exterior painting projects.
Although they are similar in some ways, these two paint formulations have distinct differences. The most significant difference between pure acrylic and styrene acrylic is the type of resin used in their formulation. They also differ in chemical content, cost, properties, and applications.
Understanding Pure Acrylic
Pure acrylic is a type of paint made with a high concentration of acrylic resin, usually more than 90%. This paint is known for its long-lasting performance, vibrant color pigments, durability, and resistance to fading over time.
Pure acrylic paints dry to a firm, glossy finish and offer vibrant and long-lasting colors. They are incredibly versatile and can be dispersed with water for different effects or layered for texture. These paints can also be mixed with other mediums to form various techniques and finishes.
Pure acrylic is typically used in professional arts, craft projects, automotive and architectural applications, and industrial applications. They can be used on various surfaces, including plastic, wood, metal, and canvas. Pure acrylic paints are more expensive than styrene acrylic.
Understanding Styrene Acrylic
Styrene acrylic, commonly known as a hybrid paint, is a type of paint formulation that combines acrylic resin with styrene. This means it features the properties of both styrene and acrylic resins. When styrene is added to acrylic resin, it can enhance the flow, flexibility, and adhesion of the paint. This makes it easier to apply and work with the paint. Despite that, they offer outstanding performance and are suitable for a wide range of applications.
Styrene acrylics can be used in texture coatings, and home improvement projects. These paints offer good coverage, durability, flexibility, and color saturation. They are available in an array of colors and can be thinned with water for varying effects.
What Is The Best Choice?
Pure acrylic and styrene acrylic have similarities in terms of general usage and water-based formulation. However, they also have distinct differences when it comes to the level of quality, pricing, and durability. Either choice can be ideal depending on the specific requirements of the projects and the desired performance elements.
Contact Bisley Company To Learn More
Whether you’re looking for pure acrylic or styrene acrylic, Bisley & Company is your one-stop for all your paint formulation needs. Our sales team is ready to help you select the right product for your unique application. Contact us today for more information.
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