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Structural adhesive and method of applying the same

IP.com Disclosure Number: IPCOM000240139D
Publication Date: 2015-Jan-06
Document File: 4 page(s) / 22K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure relates to a structural adhesive e.g. in a film format suitable, for example, for bonding a first metal part and a second part, and its application to the parts. The second part may be a metal part or any other suitable material like, e.g. a composite material. The two parts may be made out of the same metals or they may be made out of different kind of metals. The structural adhesive according to the present disclosure may comprise a thermosetable composition which comprises an epoxy compound having a selected average epoxy equivalent weight, a thermoplastic resin having a selected softening point, and an epoxy curing agent. This disclosure also relates to a method for bonding a first metal part and a second part by using such a structural adhesive. The structural adhesive may have any possible format, like a liquid, a past or a film or tape.

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Structural adhesive and method of applying the same

This disclosure relates to a structural adhesive e.g. in a film format suitable, for example, for bonding a first metal part and a second part, and its application to the parts. The second part may be a metal part or any other suitable material like, e.g. a composite material. The two parts may be made out of the same metals or they may be made out of different kind of metals. The structural adhesive according to the present disclosure may comprise a thermosetable composition which comprises an epoxy compound having a selected average epoxy equivalent weight, a thermoplastic resin having a selected softening point, and an epoxy curing agent. This disclosure also relates to a method for bonding a first metal part and a second part by using such a structural adhesive. The structural adhesive may have any possible format, like a liquid, a past or a film or tape.

Metal joints or joints between a metal part and another part in vehicles may be formed through the use of an adhesive. For example, an adhesive may be used to bond a metal panel, for example a roof panel, to the support structure or chassis of the vehicle. Further, an adhesive may be used in joining two metal panels of a vehicle closure panel. Vehicle closure panels typically comprise an assembly of an outer and an inner metal panel whereby the hem structure is formed by folding an edge on an outer panel over an edge of the inner panel. For these applications, typically an adhesive is provided to bond the panels together. Further, a sealant typically needs to be applied at the joint of the metal panels to provide for sufficient corrosion resistance.

The structural adhesive, e.g. in a film format, of the present disclosure is particularly suitable for automated handling and application, in particular by fast robotic equipments. More particularly, the structural adhesive of the present disclosure enables efficient automation of the process of forming a joint between a first metal part and a second part.

The current disclosure further relates to the combination of a thermally expandable adhesive, e.g. an adhesive film, and the utilization of a induction pre-heating process in the fabrication of bonded joint like those used in automotive body-in-white process. It also relates to a method for bonding a first metal part and a second part by using a thermally expandable adhesive and an induction pre-heating process step.

It was found that an induction pre-heating step on a structural adhesive, e.g. a structural adhesive film, provides many advantages compared to current solutions. Specifically it improves the appearance of the cured adhesive. At the same time better corrosion resistant can also be achieved.

The induction curing in the body-in-white process is widely spread, e.g. when 1 K paste adhesives are used. The aim of the induction heating in this case is focused on two purposes: a) to reach handling strength with the adhesi...