Ethan Clarke
Plastic dye cartridges are used to colour plastic. The type of colourant used depends on the type of polymeric resin that needs to be coloured. Dyes are typically used with polycarbonates, polystyrene, and acrylic polymers, while pigments are more suitable for use with polyolefins. The colourant must meet specific requirements, such as being chemically compatible with the base resin, matching a colour standard, and being chemically stable during the fabrication process. Different methods can be used to deliver colourants in moulding plastics, including masterbatches, cube blends, surface coating, and pre-coloured resins.
| Characteristics | Values |
|---|---|
| What they are made of | Chemical compounds in the form of dyes and pigments |
| Types | Dyes and pigments; dyes are usually used with polycarbonates, polystyrene, and acrylic polymers, while pigments are better suited for polyolefins |
| Constraints | The compound must be chemically compatible with the base resin, match a color standard, be chemically stable, and be durable enough to match the product's life duration |
| Parameters | The final product may be pearlescent, metallic, fluorescent, phosphorescent, thermochromic, or photochromic |
| Delivery methods | Masterbatches (concentrates), cube blends ("salt & pepper mixes"), surface coating, and precolored resins |
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What You'll Learn
- Plastic colourants are chemical compounds
- Dyes are used with polycarbonates, polystyrene and acrylic polymers
- Pigments are better for polyolefins
- Constraints: chemical compatibility, colour standard, stability, durability
- Desired effects: pearlescent, metallic, fluorescent, phosphorescent, thermochromic, photochromic
Plastic colourants are chemical compounds
Dyes are coloured compounds with an affinity for the substrate to which they are applied. They interact with substrates through various mechanisms depending on their physical and chemical properties and those of the substrate. On the other hand, pigments are coloured compounds that do not interact with the substrates. Instead, they coat the substrate's surface through a binder.
Organic pigments are carbon-based substances that occur naturally or are synthesized. They are known for their bright colours, especially reds, oranges, and yellows, and are often used in plastic products requiring solid and vibrant colours. Examples of standard organic pigments used in plastics include AZO, Phthalocyanine, and Quinacridone.
Inorganic pigments, on the other hand, are mineral-based compounds that are typically more stable than organic pigments. They are commonly used in applications where durability and resistance to UV light exposure or chemicals are important. Examples of inorganic pigments include titanium dioxide (TiO2), iron oxide (FeO), and carbon black (CB).
The manufacture of plastic pigments involves several steps, including raw material selection, the synthetic process, and milling. During raw material selection, appropriate chemical compounds capable of producing the desired colours for organic pigments are chosen. Minerals like titanium dioxide or iron oxide are mined for inorganic pigments and then processed. The synthetic process involves chemically combining the chosen chemical compounds to form a single pigment through heating, cooling, or mixing under specific conditions. Finally, the pigment is milled to reduce its particle size, allowing for better dispersion within the plastic for consistent colouring.
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Dyes are used with polycarbonates, polystyrene and acrylic polymers
Plastic colorants are chemical compounds used to colour plastic. These compounds come in the form of dyes and pigments. The type of colourant is chosen based on the type of polymeric resin that needs to be coloured.
Dyes are usually used with polycarbonates, polystyrene, and acrylic polymers. Polymeric resins are dyed using polymer-analogous attachment, which requires the presence of functional side groups bound to the polymeric backbone that can react with small molecules. The small molecules can be the dyes themselves or building blocks that enable the stepwise construction and attachment of a chromophore. This process can result in notable changes to the chromophoric system depending on the molecular structure of the dye and the nature of the reactive side group.
One example of a polymer-attached dye is polymer-attached phenolphthalein, which can be used as a pH-sensitive material for analytical purposes. This dye is colourless within a pH range of 0-8.2 and turns violet at higher pH values. By copolymerising an acrylated phenolphthalein derivative with hydrophilic monomers such as acrylic acid, water-soluble polymers with pH sensitivity can be obtained.
Another example of a polymerisable triphenylmethane dye is a radically polymerisable phenolphthalein derivative obtained through the reaction of phenolphthalein with N-(hydroxymethyl)acrylamide. This compound is highly reactive towards nucleophilic attacks, enabling condensation with electron-rich aromatic substances. The preparation of different radically polymerisable anthraquinone derivatives of blue, red, and green colours has also been introduced. Mixing these fundamental dyes enables a broad colour spectrum. Anthraquinone can be modified to enable the synthesis of dye-containing polyamides, polyesters, polyureas, or poly(acrylonitrile).
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Pigments are better for polyolefins
Plastic colorants are chemical compounds used to colour plastic. They come in the form of dyes and pigments. The type of colourant used depends on the type of polymeric resin being coloured. While dyes are typically used with polycarbonates, polystyrene, and acrylic polymers, pigments are better for polyolefins.
Polyolefins are a group of plastics that include polypropylene (PP) and polyethylene (PE). They are characterised by the presence of olefin (alkene) as a monomer and are widely used in various applications due to their favourable properties. When it comes to colouring polyolefins, pigments are generally the preferred choice.
Pigments are insoluble organic or inorganic particles added to the polymer base to give plastic a specific colour. Unlike dyes, which dissolve into the polymer, pigments remain as tiny particles within the material. This gives pigments an advantage when used with polyolefins, as they do not interfere with the chemical structure of the plastic. Instead, they are mixed with the polymer during manufacturing, allowing for consistent colouring and influencing the final product's texture and finish.
The selection of pigments for polyolefins depends on various factors. Firstly, the pigment must be chemically compatible with the polyolefin resin. Heat stability is also crucial, as the pigment must withstand the processing temperatures during fabrication. Additionally, pigments can impact the light fastness of polyolefins, with certain pigments like titanium dioxide, chrome green oxide, cobalt blue, and ultramarine blue affecting the light resistance of PE.
Inorganic pigments, such as titanium dioxide, iron oxide, and carbon black, are commonly used with polyolefins due to their durability and UV stability. These pigments provide excellent colour strength and stability, especially in shades of blue and green. Organic pigments, on the other hand, offer bright and vibrant colours but are typically more stable for indoor applications where UV light exposure is less of a concern.
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![Tracer Products LF1800CS [1] 8-oz [237 Ml] Universal Bigez A/c Dye Cartridge ,clamshell](https://m.media-amazon.com/images/I/51G4XOOQj8L._AC_UL320_.jpg)
Constraints: chemical compatibility, colour standard, stability, durability
When choosing an ink cartridge, there are several factors to consider to ensure chemical compatibility, colour standard, stability, and durability.
Firstly, in terms of chemical compatibility, dye-based inks use colour substances dissolved in a liquid, typically water, resulting in a liquid ink formulation. This makes them suitable for printing on paper and plastic substrates. On the other hand, pigment-based inks consist of small solid particles mixed with water, creating a suspension. While both types are compatible with inkjet printers, the specific printer model and substrate material will determine the appropriate ink type.
For colour standards and stability, dye-based inks offer a wider colour gamut, producing more vibrant and colourful prints. However, they are primarily suitable for indoor use and short-term applications as they can rub off when exposed to water or friction unless printed on specially coated materials. Pigment-based inks, while appearing less vibrant, offer superior durability and UV resistance, making them ideal for outdoor use and long-lasting applications.
Regarding durability, pigment-based inks again excel due to their solid particle composition. Prints made with pigment inks are smudge-free and resistant to fading over time, making them a popular choice for applications requiring longevity. Dye-based inks, while offering superior colour quality, may not withstand environmental factors as effectively and are more prone to fading or running when exposed to moisture.
In summary, the constraints of chemical compatibility, colour standard, stability, and durability are crucial considerations when selecting between dye and pigment cartridges. Dye-based inks provide vibrant colours but are more suitable for short-term, indoor applications. Meanwhile, pigment-based inks offer superior durability, UV resistance, and smudge resistance, making them ideal for long-lasting and outdoor usage. The specific requirements of the printing project will dictate the most appropriate ink type to ensure compatibility and desired results.
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Desired effects: pearlescent, metallic, fluorescent, phosphorescent, thermochromic, photochromic
Pearlescent and metallic dyes are lustrous and shiny, with pearlescent dyes resembling pearls and metallic dyes resembling metals such as gold and silver. These dyes are often opaque and can be used on any colour fabric. Pearlescent dyes can also be created by adding Pearl Ex pigments to other mediums or paints.
Fluorescent dyes are visible colourants that become brighter when exposed to light. They are used in fabric dyes, paints, and ink, and are also used for marking and tracking in production and transportation processes. Fluorescent dyes are frequently used in currency to prevent counterfeiting.
Phosphorescent dyes are also photoluminescent, meaning they emit light after exposure to UV light. They can emit a visible colour for a long time after excitation, creating a lasting glowing effect. Phosphorescent dyes are commonly used for Halloween props and costumes.
Thermochromic dyes change colour in response to temperature changes. They are used in various products, including forehead thermometers, battery testers, and architectural applications.
Photochromic dyes change colour when exposed to different lighting conditions. They are used in various applications, including smart textiles, medical thermography, food packaging, and optical data storage. Photochromic dyes can also be used in biomedical applications such as biosensors and bio-electronic materials.
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Frequently asked questions
Plastic dye cartridges are made of chemical compounds that are used to colour plastic. These compounds come in the form of dyes and pigments. The type of colourant used depends on the type of polymeric resin that needs to be coloured.
Dyes are usually used with polycarbonates, polystyrene, and acrylic polymers. Some examples of dyes include Rit and Jacquard.
Different methods for delivering colourants in molding plastics include masterbatches (concentrates), cube blends ("salt & pepper mixes"), surface coating, and pre-coloured resins.
