Publié le 2021-06-10
Powder coating, also known as electrostatic spraying or electrostatic powder coating, is a painting process on metals which consists of the application of a polyester or epoxy coating by electrostatic powder coating. The fully coated parts are then put into a high temperature oven (e.g. 30 minutes at 200°C), which allows the powder to melt and polymerise. The benefit of this process is the absence of solvent, which is of interest for the health of the operator.
Conventional sealants and adhesives (methyl methacrylate, polyurethane and MSP adhesives) usually do not stand up well to this high temperature environment: reduction in mechanical properties, loss of flexibility, surface deterioration, "bubbling" or even decomposition of the adhesive. Silicone sealants are resistant to high temperatures, but they are not paintable.
To overcome this problem, Huntsman has developed a structural adhesive: Araldite® 2052-1 and Mertz+Benteli offers a new MSP, Merbenit PC200, which is specially designed to withstand the temperature stresses of powder coating processes.
Araldite® 2052-1 is a reinforced two-part methacrylate adhesive requiring minimal surface treatment and resistant to high temperatures up to 140°C continuously.
To apply Araldite® 2052-1, we offer you the manual gun PC COX VBM MR200. High power (25:1 trigger ratio), ideal where there is no access to compressed air.
MERBENIT PC200 can withstand a two hour oven treatment at 200°C (or 20 minutes at 240°C) without altering its properties (tensile strength, elongation at break, Young's modulus, etc.).
It is often used in the powder coating process, masking tapes.
Adhesive tape TEFLEASE MG2 can withstand temperatures up to 260°C. It consists of a PTFE TEFLEASE MG2 film, which provides a permanent release surface.