Maya Ellison
Pigments are an essential component of plastics, providing colour and functionality to various plastic products. They are typically divided into organic, inorganic, and synthetic categories, with each type exhibiting unique properties and performance characteristics. The choice of pigment depends on the specific application, with factors such as lightfastness, thermal stability, tinting strength, and environmental impact playing a crucial role in the selection process. Natural pigments, derived from animals or vegetables, offer an eco-friendly alternative to synthetic pigments, making them suitable for use in plastics while also meeting sustainability goals.
| Characteristics | Values |
|---|---|
| Source | Animal or vegetable, minerals, or synthetic |
| Performance | Determined by organic components, surface of the article, processing heat history, and stabilisation package |
| Application | Powder or liquid |
| Main types | Organic, inorganic, and synthetic |
| Main structure type | Solvent dye, disperse dyes, or pigment |
| Compatibility | Must be compatible with the plastic to be coloured |
| Testing | Quality control is essential, testing for features such as colour strength, particle size, and dispersion quality |
| Customization | Some manufacturers offer customization services, creating pigments to meet unique specifications |
| Lightfastness | Inorganic pigments typically exhibit superior lightfastness than organic pigments |
| Thermal stability | Must remain unaltered during the colouring process |
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What You'll Learn
- Natural pigments are chemical compounds that absorb or scatter light waves, creating colour
- Natural pigments are organic or inorganic particles added to a polymer foundation
- Organic pigments are derived from animals or vegetables, while inorganic pigments are obtained from minerals
- Inorganic pigments exhibit superior lightfastness and are more easily disseminated in the resin
- Natural pigments must be tested for compatibility with different plastic types and must comply with industry safety standards
Natural pigments are chemical compounds that absorb or scatter light waves, creating colour
In biology, a pigment is any coloured material found in a plant or animal cell. These pigments reflect the colours of the wavelengths that they cannot absorb. For example, chlorophyll appears green because it reflects green light and absorbs blue and red light.
The same principle applies to pigments used in plastics. Pigments for plastics are chemical compounds that are added to a polymer base to give it a specific colour. These pigments can be organic, inorganic, or synthetic. Organic pigments come from animals or vegetables, while inorganic pigments are obtained from minerals such as rocks and stones. Synthetic pigments are manufactured or refined and are typically intended for industrial use.
The choice of pigment for plastics depends on the desired colour and performance requirements. Inorganic pigments, such as titanium dioxide, are commonly used in the plastics industry due to their superior lightfastness and ease of dissemination in the resin. Organic pigments, on the other hand, can be difficult to disperse and may clump together, causing defects in the final product.
When selecting a pigment for plastics, it is important to consider factors such as tinctorial strength, thermal stability, and chemical compatibility to ensure that the pigment remains unaltered during the colouring process and does not affect the properties of the plastic.
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Natural pigments are organic or inorganic particles added to a polymer foundation
Organic pigments are derived from natural sources such as animals or vegetables and are made up of various chemical families. They have a wide range of qualities and are best suited for applications requiring a lot of tinting power and bright colours. However, they can be difficult to disperse and may clump together, resulting in defects and dots in the end product. The performance of organic pigments is influenced by factors such as the surface of the article, processing heat history, and stabilisation package.
Inorganic pigments, on the other hand, are obtained from minerals such as rocks and stones. They are brighter and last longer than organic pigments, exhibiting superior lightfastness. Inorganic pigments are also more easily disseminated in the resin and are commonly used in applications where surfaces need to remain calm and resistant to the environment, such as roofing, decking, and car exteriors. They are cost-effective and help prevent damage from the sun's heat, saving money and energy.
The choice between organic and inorganic pigments depends on the specific requirements of the application. If a high level of transparency is desired, the pigment particle size should be minimised by covering the particles immediately after creation to prevent crystal formation. This is often done using rosin or rosin derivatives.
Additionally, it is important to consider the tinctorial strength and thermal stability of the pigment to ensure that it is compatible with the plastic and will not alter during the colouring process.
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Organic pigments are derived from animals or vegetables, while inorganic pigments are obtained from minerals
Natural pigments are used to colour plastic materials. These pigments are either organic or inorganic particles mixed with a polymer base to give a specific colour to the plastic.
Inorganic pigments, on the other hand, are mined from the earth or created in a laboratory using metallic compounds. They tend to be opaque, dense, heavy, and completely permanent. Inorganic pigments include white opaque pigments used to provide opacity and lighten other colours. The most important member of this class is titanium dioxide, which is the most extensively used inorganic pigment in the plastics sector. Other examples of inorganic pigments include the classic earth colours, such as ochres, umbers, and siennas, which are mined directly from the earth. Their rich colours come from iron oxides, copper, chromium, or aluminium, along with various amounts of clay, chalk, and silica.
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Inorganic pigments exhibit superior lightfastness and are more easily disseminated in the resin
The use of plastic products can be shortened by exposure to sunlight and some artificial lights. As a result, UV protection and weather-resistant colours are typically required for polymers used outside. Inorganic pigments, such as metal oxides and sulphides, carbon black, and titanium dioxide, are more easily disseminated in the resin. Titanium dioxide is the most extensively used inorganic pigment in the plastics sector.
Inorganic pigments exhibit superior lightfastness, which refers to a pigment's ability to withstand exposure to light, both direct and indirect, natural and artificial, without suffering any visible change in appearance. The most damaging components of light lie in the Infra Red and Ultra Violet regions of the spectrum. Inorganic pigments are superior in terms of providing excellent resistance to heat, light, weathering, solvents and chemicals. They are also more cost-effective to utilise.
Inorganic pigments are best for applications that require a lot of opacity. They are either oxides, sulphides, sulfoselenides or oxyhalides. They are commonly utilised for metallic finishes and constitute an important type of inorganic pigment. Their excellent transparency creates a pleasing appearance, and their weatherability resistance improves the weatherability of pigments with which they can be blended.
Inorganic pigments are also used in applications where surfaces remain calm and resistant to the environment, such as roofing, decking, and car exteriors. Several inorganic pigments have a high IR reflectance for a given visible colour.
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Natural pigments must be tested for compatibility with different plastic types and must comply with industry safety standards
Natural pigments are used to colour plastic products, enhancing their aesthetic value and serving other purposes such as improving resistance to environmental challenges and durability. They are insoluble organic or inorganic particles added to a polymer foundation to give it a specific colour or function.
The pigment's performance will be determined by factors such as the surface of the article, processing heat history, and stabilisation package. The degree of crystallinity and the speed of crystallisation determine the final properties of a plastic article. These characteristics are influenced by organic pigments during the cooling phase of plastic production, especially in HDPE injection moulding.
The use of plastic products can be shortened by exposure to sunlight and some artificial lights. As a result, UV protection and weather-resistant colours are typically required for polymers used outside. Outdoor exposure experiments in the affected climatic region(s) are required to measure weathering resistance in practice. This isn't always feasible, so accelerated testing is a popular alternative. The light stabiliser system must be examined with the pigment composition and the end product's stipulated fastness parameters. Lightfastness is a property of the colour fastness of a plastic material when applied in indoor applications.
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Frequently asked questions
Pigments for plastics are chemical compounds that give colour to the product. They are divided into particles of microscopic size and have their own colour, which can dye a certain object.
Pigments for plastics can come from three main sources: organic, inorganic, and synthetic. Organic pigments are made from animals or vegetables, inorganic pigments are obtained from minerals, and synthetic pigments are manufactured or refined for industrial use.
Inorganic pigments are more resistant to shearing and are more cost-effective to use. They are also more easily disseminated in the resin.
Organic pigments include azo condensation pigments, CI Pigment Yellow 93, 94, 95, CI Pigment Red 144, 166, 242, benzimidazolone pigments, CI Pigment Yellow 151, 154, 180, and many more.
It is important to consider the tinctorial strength, thermal stability, and chemical compatibility of the pigment with the plastic. Additionally, the impact on the environment and sustainability practices should also be considered.
