Hybrid components containing reactive hotmelt adhesives
View Patent ↗Reactive hotmelt adhesives based on copolyamide can be used in hybrid components. These hybrid components find application in, for example, vehicle construction and aircraft construction.
1. A process for producing a hybrid component, comprising:
bonding a metal to a polymer with a copolyamide-based hotmelt adhesive;
thereby obtaining said hybrid component comprising said metal and said polymer;
wherein said metal is coated with said copolyamide-based hotmelt adhesive, to obtain a coated metal; and
wherein said coated metal is bonded to said polymer;
wherein said metal is coated by an electrostatic spray gun, to obtain said coated metal;
wherein said coated metal is heated at about 150° C. over a time of approximately 120 to 300 seconds in order to cause incipient melting of the adhesive;
wherein said polymer is introduced by injection moulding, to obtain a structure-forming component which then passes through an EC oven for coating a temperature of 150° C. to 190° C. for a period of 10 to 30 minutes.
2. The process according to claim 1 , wherein said metal is bonded to said polymer with a copolyamide based hotmelt adhesive further comprising isocyanate and epoxide.
3. The process according to claim 1 or 2 , wherein said copolyamide is based on laurolactam.
4. The process according to claim 1 , wherein said hotmelt adhesive comprises 2.5% to 15% of blocked isocyanate and 2.5% to 10% of epoxide.
5. The process according to claim 1 , further comprising:
coating said metal over its full area with said hotmelt adhesive using an electrostatic spray gun or a suitable coating system, and
sintering incipiently at 150° C. for approximately 150 s.
6. The process according to claim 1 , further comprising:
partially coating said metal with said hotmelt adhesive using an electrostatic spray gun or a suitable coating system, and
sintering incipiently at 150° C. for approximately 150 s.
7. The process according to claim 4 , wherein said hybrid component subsequently passes through an EC oven for coating.
8. The process according to claim 1 , further comprising degreasing of said metal.
9. The process according to claim 1 , further comprising preheating of the metal to 60 to 80° C.
10. The process according to claim 1 , wherein said hotmelt adhesive is based on laurolactam and comprises a blocked isocyanate and an epoxide.
11. The process according to claim 1 , wherein said hybrid is exposed to a temperature of 150° C. to 190° C. for a period of 10 to 30 minutes in a cathodic electrocoating oven.