Sofia Martinez
Plastic is derived from natural, organic materials such as cellulose, coal, and crude oil through polymerisation or polycondensation. Once extracted, these organic materials are linked together to form long polymer chains, which do not have a specific colour hue. There are several methods available for colouring plastics, including masterbatches, cube blends, precolours, solvent dyeing, and utilizing a colour feeder. The choice of colouring method and colourant can affect the mechanical properties of the plastic, such as tensile strength, impact resistance, and flexibility, as well as its heat resistance and chemical resistance.
| Characteristics | Values |
|---|---|
| Methods | Masterbatches, Cube Blends, Precolors, Solvent Dyeing, Color Feeder, Dry Pigments, Food Coloring |
| Factors to consider | Mechanical Properties (tensile strength, impact resistance, flexibility), Heat Resistance, Chemical Resistance, Environmental Conditions, MHRA Guidelines |
| Benefits | Identification, Customization, Cosmetic Quality, Signature Effect Aesthetic, Enhanced Value |
| Considerations | Colorant and Polymer Compatibility, Ratio of Color to Plastic, Structural Integrity, Suitability for Intended Use |
| Types of Plastic | Polyethylene, Polypropylene, Polyvinyl Chloride, Acrylic |
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Masterbatches
The process of colouring plastics with masterbatches is simple. The masterbatch is mixed with resin particles at a prescribed ratio. The compatibility between the masterbatch and resin prevents sticking during the mixing process, promoting uniform dispersion throughout the plastic. This uniform dispersion guarantees the stability of the colour and enhances the overall colour stability of the final product.
The final colour of the masterbatch will depend on several factors, including the pigment selected, the type of polymer used, the base colour of the polymer, and the type of extrusion machine used. The colour of the masterbatch can also be customised to achieve a specific colour, with the option to add special additives to make the product stand out, such as making it glow in the dark or look like stone.
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Cube blends
Masterbatches are concentrated pigments that are mixed into a polymer resin. They are the most popular form of colouring plastic and are used by moulders due to their economical and compatibility benefits. Cube blends are similar to masterbatches but do not use presses or metering equipment. Instead, they are dry blends that are ready to use with a natural polymer.
The advantages of using cube blends are that they allow for precise control over the final output without the need for additional equipment. The polymer involved in the cube blends also remains solid, helping to preserve its original properties.
However, the biggest disadvantage of using cube blends is the possibility of colour variations. This is because the dry colour can be scattered easily, creating an uneven colour. It is also difficult to measure, and it creates discolouration and dirt in the general environment.
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Precolors
The process of using precoloured resins begins with the selection of appropriate pigments. These pigments can be organic or inorganic particles that are added to a polymer base to give a specific colour to the plastic. Organic pigments are challenging to disperse and tend to form agglomerates (clumps of pigment particles), which can cause spots and specks in the final product. On the other hand, inorganic pigments like metal oxides, sulphides, and carbon black are more easily dispersed in the resin. Titanium dioxide is the most widely used inorganic pigment in the plastics industry.
Once the pigments are chosen, they are mixed with natural pellets to create the desired colour. This step is crucial to ensure that the final product meets the desired colour expectations and enhances its appeal to consumers. The ratio of colour to plastic is an important consideration, typically ranging from 1:100 to 5:100. As the volume of pigment injection increases, its impact on the colour depth and plastic properties also increases.
Precolored resins are then supplied to moulders, who use them to shape and colour the plastic simultaneously. This process eliminates the need for separate colour matching and ensures lot-to-lot consistency in the final product. The ease of use and quick turnaround time make precolors a popular choice for colouring plastics, especially for those new to custom colour matching or dealing with high masterbatch let-down ratios.
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Colour compounding
There are several methods available for colouring plastics, including masterbatches, cube blends, and pre-colours. Masterbatches are the most common method, consisting of concentrated pigments dispersed into a polymer carrier resin. They offer minimal wastage and can be introduced in small volumes, making them the most economical method. Cube blends are also popular among moulders as they don't require meter equipment during the press process. However, they may result in inconsistencies when blending colours. Pre-coloured resins are often selected for their ease of use, especially when engineering resins require high masterbatch let-down ratios.
Speciality colour compounding is advantageous for identification purposes, creating custom colours, and achieving a cosmetic-quality appearance. The colour matching process is crucial and can be facilitated by advanced colour formulation software, which considers factors such as the base polymer, desired colour, and target application. The physical properties of the polymer and processing conditions are also taken into account to ensure accurate colour matching.
The colour matching process begins with a colour match request, which can involve replicating an existing colour or creating a new one based on specific colour standards. Careful selection of pigments and dyes is essential, considering factors such as heat resistance, UV and weathering fastness, migration fastness, and compliance with regulations. The ratio of colour to plastic is critical, typically ranging from 1:100 to 5:100. The chemical compatibility of the colourant and polymer is another important consideration, as some colourants can alter the properties of polymers, such as flexibility and temperature tolerances.
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Heat-induced colour change
Thermochromic polymers or thermochromic inks/dyes are temperature-sensitive compounds that change colour when exposed to heat. The change in temperature causes the crystallic or molecular structure of the pigment to change reversibly, resulting in the absorption and emission of light at a different wavelength than at lower temperatures. The colour change can be from non-reflective (black) through the spectral colours to black again, depending on the temperature. The high-temperature state usually reflects blue-violet, while the low-temperature state reflects red-orange.
The most common example of this technology in use is the thermochromic paint coating on coffee mugs, which changes colour or becomes transparent when hot coffee is poured into them. These are often referred to as "magic mugs" or "heat-changing mugs". Another example is the use of leuco dye in spoons used in ice cream parlours and frozen yoghurt shops. When dipped into cold desserts, the spoons change colour. Leuco dyes are also used in flat thermometers, battery testers, clothing, and the indicator on maple syrup bottles.
Leuco dyes have a less accurate temperature response than liquid crystals, but they are easier to work with and allow for a greater range of applications. They are suitable for general indicators of approximate temperature, such as "too cool", "too hot", or "about OK". Leuco dyes are used in applications where temperature response accuracy is not critical, such as novelties, bath toys, flying discs, and approximate temperature indicators for microwave-heated foods.
Scientists have also engineered a polydiacetylene polymer that reversibly changes colour within 1 second of being heated or cooled. The critical temperature of the transition can be tuned by varying the length of the alkyl chains in the polymer.
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Frequently asked questions
The most common methods used to add colour to plastics are masterbatches, cube blends, and precolours. Masterbatches are the most economical and common method, consisting of concentrated pigments dispersed into a polymer carrier resin. Cube blends are favoured by moulders as they don't require metering equipment during the press process. Precolours are often selected for their ease-of-use, especially when engineering resins require high masterbatch let-down ratios.
The choice of colourant and colouring method can impact the mechanical properties of plastic, such as tensile strength, impact resistance, and flexibility. Some colourants can reduce the heat resistance of plastics, making them more prone to deformation at higher temperatures. Additionally, colourants can affect the chemical resistance of plastics, making them more susceptible to discolouration or damage when exposed to certain chemicals.
To dye a small object made of clear acrylic plastic, you can use food colouring. First, clean the object with a microfiber cloth and warm soapy water. Then, mix glue, food colouring, and water in a small container. Add the mixture to the object, ensuring it coats the inside evenly. Finally, turn the object upside down and let it dry completely for several hours.
