I want to make a glue to adhere PVC to metal (for example Aluminium or stainless steel).This have to be partly air drying.
The process is as follows: The metal is impregnated with adhesive. The PVC compound is going out from the extruder and placed on the metal. The metal and the compound should stick together by about 100-150 °C .
What kind of resins do you recommend for adhesive?
Thanks
Metals have a high energy surfaces, and polymers (also polyvinychloridu, PVC) are low energy surfaces. For bonding polymers to metals it is necessary to increase the surface energy of the polymers using suitable modification methods, e.g. surface treatment of polymers with low-temperature plasma at atmospheric (barrier plasma) or reduced pressure (radio-frequency plasma) in an air environment. Surface treatment may also occur by using suitable primers, respectively adhesion promoters. Their application increases the polarity of the polymers and reduces the difference between the polarity of the metal and the polymer in the bonding and increases the strength of the glued joints. For bonding of aluminum (or stainless steel) substrate to polyvinychloride (PVC, hard) the pre-treatment of PVC to higher polarity is necessary. The surface of aluminum to hard PVC can be bonded using rubberized cyanoacrylate adhesive Loctite 480 with Loctite 770 primer (covering the PVC surface before gluing to drying). For bonding stainless steel, sand or corundum blasting is required prior to bonding, degreasing of stainless steel surface and then bonding.
Thank you very much Mr. Novak.It was so useful.
another question:
After rouphing the metal surface, metal gets smeared with glue.then PVC by 150 °C placed on metal. so is cyanoacrylate enough for that?
Thanks for your kindness
Dear Dr. Saiedeh Ghaffari,
You can use for temperature 150 oC other suitable [costruction] adhesives, epoxy-based composite adhesives modified for higher temperature applications or polyurethane adhesives. Polyurethane adhesives have a nice resistance against water and epoxy-based adhesives have resistance against influence of mineral oils. For bonding of aluminum bar a fine abrasive paper [designed as 1000 or 1200] to remove aluminum oxide from the surface should be used.The abraded aluminum surface must be degreased e.g. with trichlorethylene or dichloromethane. For modification of PVC it is necessary to use primer, resp. an adhesion promoter, which is applied in a thin layer to the surface of the polymer and allowed to dry. This is followed by bonding the aluminum to the PVC, whereby the adhesive is carried on both surfaces of the substrates to be bonded. The bonded adhesive joint Al - PVC must be fixed until the adhesive, e.g.epoxy or polyurethane, cures. As an adhesion promoter, you can use a chlorinated polymer in an organic solvent solution or a primer based on an aqueous dispersion of the polymer that is environmentally friendly and less harmful to health, but this is a special category of solutions for plastic bonding. I can give you the necessary information about the appropriate primers.
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