Yes, acrylic polymer is a paint binder.
A paint binder is a crucial component in paint. It is the substance that holds the pigment particles together and forms a continuous film as the paint dries. This film adheres the pigment to the surface being painted. Different types of binders result in different paint properties, such as durability, flexibility, water resistance, and drying time.
Acrylic Polymer as a Binder
Acrylic polymers are widely used as binders in various types of paint. These synthetic polymers offer excellent durability, flexibility, and water resistance once dry, making them popular for a wide range of applications, from fine art to house paint.
According to the provided reference:
- Tempera Paints – Tempera and craft paints developed for use in scholastic settings can be formulated with either an acrylic polymer binder or plant-based starch binder, which is not usually water-resistant when dry.
This directly confirms that acrylic polymer is used as a binder, specifically mentioned in the context of tempera and craft paints.
Types of Binders
Different paints use different binders. Common examples include:
- Acrylic Polymer: Found in acrylic paints, craft paints, and some tempera paints. Provides durability and water resistance.
- Linseed Oil: Traditional binder for oil paints. Dries slowly by oxidation.
- Gum Arabic: Used in watercolors and gouache. Allows pigment to be re-wetted after drying.
- Starch: Used in some inexpensive tempera or craft paints. Not usually water-resistant when dry.
- Vinyl Acetate Polymer (PVA): Used in some glues and paints, offering good adhesion.
In summary, the acrylic polymer acts as the "glue" that binds the pigment particles together and adheres the paint film to the substrate. Its use in various paints, including those mentioned in the reference like tempera and craft paints, highlights its role as a binder.
