Priya Kapoor
A binder is a crucial component of paint, acting as the substance that holds all the other ingredients together and binds them to the painted surface. It is typically a liquid, such as oil or water, and its choice can significantly impact the paint's properties, including drying time, strength, and colour retention. Binders can be natural or synthetic, with the former derived from organic materials like lipids, tree resins, and beeswax, and the latter often petroleum-based. The type of binder used depends on the desired characteristics of the paint, with some binders offering advantages like quick drying times, heat resistance, and elasticity. Understanding the function and options for binders is essential for creating custom paints and coatings that meet specific requirements.
| Characteristics | Values |
|---|---|
| Function | Holds other components of paint together, including pigments, base, and extender |
| Categories | Water-soluble, fat-soluble, organic, inorganic, natural, synthetic, physical drying, chemical drying |
| Examples | Linseed oil, tung oil, poppy oil, nut oil, acrylic resins, epoxy polymers, egg, wax, glue, gum, resins, petroleum-based binders |
| Effects on Paint | Transparency, opacity, lightfastness, drying time, film strength, colour over time, durability, toughness, waterproofness |
| Additives | Algaecides, fungicides, anti-settling agents, bactericides, dispersants, acrylic polymers |
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What You'll Learn
Binders are essential for paint
Binders can be divided according to their material type (water-soluble/fat-soluble, organic/inorganic, natural/synthetic) or according to their drying behaviour. Physical drying means that a solvent evaporates, leaving behind the solid components of the binder; chemical drying means that smaller molecules combine to form larger ones, making the mass as a whole more solid. A mixed form between the two is represented by egg tempera and other emulsions, in which both processes take place simultaneously. The type of binder used can also affect the transparency or opacity of the paint. Transparent paints are formulated so that pigments settle on the substrate in a way that allows light to pass between them, creating a luminous effect and keeping underlayers visible. Opaque paints are formulated to prevent light from passing through the top layer, giving colours a flat, matte effect.
Binders have been used in paint since the Stone Age, when pigments were mixed with animal fat or glue. Other natural binders include resins and gums obtained from trees, wax, and oil. In the late Middle Ages in Europe, the technique of painting with drying oils emerged, and since the middle of the 20th century, synthetic binders have been on the market. Synthetic binders are derived from petroleum or other fossil materials and have many favourable properties, such as being water-dilutable, elastic, relatively inexpensive, and waterproof after drying. However, they are not biodegradable, which makes disposal problematic.
Ready-made binders are available on the market, or they can be made from scratch. Common natural binders include linseed oil, tung oil, poppy oil, and nut oil. Synthetic binders include acrylic resins, a subgroup of vinyls, and polymerization of the acrylic acid molecule, which produces a polymer dispersion that is the binder in acrylic paint.
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Natural binders
A binder is the component of the paint that holds the other components together. It is one of the two absolutely necessary components of any paint, the other being the pigment. Binders can be natural or synthetic. Natural binders have been used since the Stone Age, with animal fat, glue, resins, gums, wax, and oil being some of the earliest known binders.
Casein, derived from milk, has been used in paint since the time of Asian cave paintings. It is durable, fast-drying, and water-soluble, but has a strange smell. Egg yolk and egg whites can also be used as natural binders, resulting in tempera paint and glair paint, respectively. Tempera paint dries quickly and can be over-painted, but does not keep for very long. Glair paint is delicate and works best for works on paper.
Other natural binders include wax, which can be used in oil sticks, oil pastels, pencils, and crayons, and methyl cellulose, a natural, plant-based adhesive that is non-toxic, vermin-proof, and dries clear.
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Synthetic binders
The function of a binder in paint is to act as a binding agent that holds the other components of the paint together. Binders can be natural or synthetic, and they can be water-soluble or fat-soluble. The type of binder used in a paint often gives the paint its name, such as "oil paint" or "acrylic paint".
However, synthetic binders derived from petroleum or other fossil materials are not biodegradable, which makes their disposal problematic. Additionally, their durability has yet to be proven.
Some examples of synthetic binders include epoxy resins, which are often used as binders in industrial coatings, and alkyd polymers, which are used in water-borne emulsion paints. Epoxy resins provide excellent adhesion and high resistance to chemicals and physical damage, making them ideal for use in ships and chemical storage tanks. Alkyd polymers dry through a physical process involving the evaporation of water and the subsequent coalescence of polymer droplets, forming a hard polymer matrix that acts as a binder for the pigment.
Ready-made synthetic binders can be purchased on the market, or artists can choose to mix their own paints using pigments and synthetic binders.
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Binders and transparency
Binders are an essential component of paint, holding the other ingredients together and binding them to the painted surface. The type of binder used depends on the desired properties of the paint, such as drying time, film strength, colour, and transparency.
The transparency of a paint is influenced by both the pigments and binders used. Transparent paints are formulated to allow light to pass through, creating a luminous effect and revealing underlying layers. Opaque paints, on the other hand, are designed to block light, resulting in a flat, matte finish. The choice between transparent and opaque paints depends on the desired artistic effect and the number of layers in the painting.
Binders can be categorised based on their material type and drying behaviour. Water-soluble binders, such as gum arabic in watercolours, produce transparent effects and are easy to work with. However, they may not be water-resistant when dry. Oil-based binders, such as linseed oil, are commonly used in oil paints and can be mixed with other substances to modify their properties. The choice of oil can impact the drying time and whether the paint yellows over time.
Additionally, synthetic binders, such as acrylic resins, have become popular since the 20th century. These binders offer advantages such as water dilution, elasticity, compatibility with pigments, and crack resistance. They also do not require harmful solvents and provide a waterproof finish. However, their durability has yet to be fully proven, and their non-biodegradability poses disposal challenges.
The choice of binder significantly impacts the transparency and overall behaviour of the paint. Artists can experiment with different binders and their combinations to achieve the desired effects, durability, and aesthetic qualities in their paintings.
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Binders and preservation
Binders are an essential component of paint, holding the other ingredients together and binding them to the surface being painted. They are also known as vehicles or resins. The type of binder used can affect the transparency or opacity of the paint, its drying time, and its durability.
Binders have been used in paint since the Stone Age, with early examples including animal fat, glue, tree resins and gums, and wax. In ancient Egypt, the fresco technique was developed, using plaster on walls as a binder. Over time, new substances were discovered, such as dammar resin and carnauba wax, and new techniques, such as the tempera technique, which uses an emulsion of aqueous and fatty binders. Since the 20th century, synthetic binders based on petroleum have been developed, such as those found in acrylic paints and synthetic varnishes. These synthetic binders have many favourable properties, including being water-dilutable, elastic, relatively inexpensive, and waterproof when dry. However, they are not biodegradable, which can make disposal problematic.
When making paint, the choice of binder depends on the desired characteristics of the paint, such as its transparency or opacity, drying time, and durability. For example, linseed oil is commonly used as a binder but tends to yellow over time, so poppy seed oil may be preferred for lighter colours. Water-soluble binders, such as gum arabic, are used in watercolour and gouache paints but are not water-resistant when dry. Encaustic paints, on the other hand, use a beeswax and damar resin binder, which is designed to be heated and cooled during the painting process.
The preservation of paint is closely tied to the choice of binder. Some pigments and binders are more susceptible to fading caused by exposure to UV light, a property known as lightfastness. Binders can also be affected by the elements, with exterior paint, for example, requiring protection from algae, lichen, and mould. The use of preservatives and additives can help to extend the life of paint, but the correct ratio of binders and other ingredients is also critical to its durability.
Overall, binders play a crucial role in the preservation of paint by holding the ingredients together and binding them to the surface. The choice of binder and the addition of preservatives can help to extend the life of paint and protect it from the elements and UV light.
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Frequently asked questions
A binder is a major component of paint that acts as a vehicle or catalyst, holding all the other components of the paint together and binding them to the surface being painted.
Common binders include linseed oil, tung oil, poppy oil, nut oil, and synthetic binders.
Binders can impact the drying time, film strength, and colour of the paint. They also affect the transparency or opacity of the paint, with transparent paints allowing light to pass through and opaque paints creating a flat, matte effect.
A paint medium is made up of a binder and a carrier. The binder is the substance that holds the pigment and other components together, while the carrier is the liquid that allows the pigment to be spread out and applied to a surface.
The type of binder used depends on the specific requirements of the project, such as the desired appearance, durability, drying time, and cost. Other factors include the type of substrate and the elements it will be exposed to.
