Summary
- Mass coloring of plastic
- Painting of plastic products
- Advantages of coloring and plastic products
- Paints with particular technical characteristics
- Special paints for PC and PMMA
- Special powder paints with metal or ceramic
Coloring and Painting of Plastic Products
The products made of plastic, in addition to the countless economic-structural and environmental circularity qualities, also have the advantage of being able to accommodate, not only colors in the molten mass during the production of the element, but can also be painted on the surface to attribute to the object high aesthetic effects.
The coloring of the plastic melt during the production of the object, through the use of dyes, takes place by mixing the granule or colored powders with the polymer of the product, taking advantage of the melting and mixing action that imprints the extruder inside which components pass.
At the end of the production by the machine, the piece will be uniformly colored in the mass, a result for which the product could be suitable for the final use or it could be sent to the painting plant for special finishes.
It is also possible that the pieces that must be sent for painting are produced without any color in the mass.
That said, the paint layers on plastics must take into account the structure on which they adhere and the characteristic of the polymer with which the object is made.
In fact, the hardness, the elongation behavior and the temperature of the paint layers to be applied on the product must take into account a possible physico-chemical reaction of the plastic it is made of.
A too rigid dynamic behavior of a layer of paint applied to a plastic object could negatively affect the durability of the element, such as contact with temperatures and solvents that are required for the color spreading work.
Some shades applied to plastics have a positive effect on the risk of photochemical decomposition, such as black, which positively affects UV protection by acting as a filter.
Paints can incorporate chemical compounds that operate in a targeted manner in the production of certain elements, such as abrasion-resistant conductive paints, used in petrol tanks, or loaded with Ag, Ni or Cu to achieve high frequency shielding. of electronic equipment.
There are also transparent paints that increase the scratch resistance for Polycarbonate and PMMA, such as acrylic, siloxane or polyurethane, applied by spray or immersion.
In the coloring of plastic materials, powders can also be used, especially for polymers PA6 and PA66, which receive the coloring through a process that allows the polymer to be made conductive, through metal or ceramic microspheres, especially in the healthcare sector.
Automatic translation. We apologize for any inaccuracies. Original article in Italian.
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