Improved method for prefixing and adhering parts

Abstract

The invention relates to a method for prefixing and adhering two parts T1 and 12, having the steps of: a) providing a single-component moisture-curing adhesive K and an accelerator composition B whichcontains between 10 and 80 wt.% of water; b) producing an accelerated adhesive KB1 by mixing the adhesive K with a water-containing accelerator composition B in order to form the accelerated adhesiveKB1, said accelerated adhesive KB1 containing between 5 and 20 vol.% of the accelerator composition B, and subsequently applying the accelerated adhesive KB1 onto the first part T1; c) producing an optionally accelerated adhesive KB2 by optionally mixing the adhesive K with the water-containing accelerator composition B in order to form the optionally accelerated adhesive KB2, said optionally accelerated adhesive KB2 containing less than 5 vol.% of the accelerator composition B, and subsequently applying the optionally accelerated adhesive KB2 onto the first part T1; wherein the steps b) andc) can be carried out in any order, and the amount of the accelerated adhesive KB1 applied onto the first part T1 is less than the amount of the optionally accelerated adhesive KB2 applied onto the first part T1; and d) joining the second part T2 with the adhesive point such that a composite joint T12 is produced which connects the two parts T1 and T2 via the accelerated adhesive KB1 and the optionally accelerated adhesive KB2. The method according to the invention allows parts which are to be adhered to be prefixed and adhered using a single adhesive without requiring an additional prefixingprocess and without adversely affecting the resulting adhesion due to a cured mechanically inhomogeneous adhesive. Thus, a faster and better adhesion process is facilitated which can additionally be carried out with less effort.

Description

technical field [0001] The present invention relates to a method for prefixing and bonding parts which are bonded using a moisture-curing composition. Background technique [0002] Adhesion has long been used in industrial manufacturing to join parts of articles. Bonding has the advantage over other joining techniques such as bolting or welding that it can be used more widely than welding and does not cause mechanical weakening or cosmetic damage to the article since no drilling etc. is required. [0003] For an efficient production process, it is sometimes necessary to pre-fix the parts to be joined after the adhesive has been introduced into the bonded joint, so that the adhesive can cure or build up sufficient strength without the parts slipping. In this way, rapid temporary fixation can be achieved, which results in shorter production cycles and allows a greater selection of adhesives. [0004] Mechanical prefixing by means of suitable devices is not possible in all ca...

AI Technical Summary

Problems solved by technology

[0004] Mechanical pre-fixation by suitable means is not feasible in all cases and has the disadvantage that complex and expensive fixing means must be used, which in turn prolongs the bonding process and thus the entire manufacturing process

In particular, this method typically cannot be used for joining thermoplastic materials because of the heat-induced deformation that would occur on the part