Overview
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ABSTRACT
The use of paints on plastics allows for modifying the aspect, surface state, feel or color of the object and preserving the material from environmental aggressions which may alter its appearance and mechanical properties. Parts in painted plastics present different characteristics from painted metallic parts such as the diffusion of solvents in plastics and the modification of mechanical properties through paint. The main properties of polymers are presented before they are painted they vary according to the shaping of the plastic material (injection). Due to their chemical nature, some of them require surface modification. The nature of the first coat of paint is specific to plastic materials as it ensures the adherence of the paint. The following coats are the same as those applied on metals.
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Read the articleAUTHORS
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Evelyne DARQUE-CERETTI: Doctor of State - Senior Research Fellow, École des Mines de Paris
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Bernard MONASSE: Doctor of State - Senior Research Fellow, École des Mines de Paris
INTRODUCTION
The development of plastics offers many advantages that justify their use:
low density, a crucial advantage in the automotive and aerospace industries;
durability, corrosion resistance and shock resistance;
greater freedom of form, highlighted by the design;
easy integration of functions ;
lower investment costs, facilitating more frequent form renewal.
Designers' requirements and the durability of plastics often call for painted parts, to give them the protection and appearance they need. Painted plastics are often in competition with the same mass-colored plastics, which are generally less expensive but cannot guarantee a durable appearance over time. As a result, they are confined to applications where durability is not an essential factor. Painting plastics gives them an appearance similar to that of painted metal parts, ensuring their integration into complex assemblies with a uniform appearance. Numerous industries apply paint to plastic materials: household appliances, electrical engineering, medical equipment, the toy industry and, above all, the manufacture of pleasure boats, but it is the automotive industry that makes the greatest use of this finishing process, both for the passenger compartment and the bodywork. It's for this reason that the examples chosen to examine the problems of painting plastics come from this industry. We'll also look at the constraints that force us to be extremely vigilant when it comes to choosing and using the plastic/paint combination.
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Painting plastics
Bibliography
Events
SURPLAST conference organized by SURFACES magazine
SURCAR
SFIP Congress (French Society of Plastics Engineers)
http://www.sfip-plastic.org/congres.php
SFIA (French Society...
Standards and norms
- Standard Guide for Evaluation of Coatings Applied to Plastics. - ASTM D3002-07 - Nov. 2007
- Standard Test Methods for Measuring Adhesion by Tape Test. - ASTM D3359-09 - Juin 2009
- Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact). - ASTM D 2794 - Déc. 1999
- Paints and varnishes – Scratch test (NF T30-088). - NF EN ISO 1518 - Mai 2001
- Paints...
Websites
CRITT: industrial paints http://www.critt-mdts.com/fichiers/departements/Peinture.pdf
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
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Industrial/painting/automotive equipment
http://www.sames.com/fr/produits/industrie_automobile/peinture_robotique/index.php
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...
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