JPS601903B2 - Adhesion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bonding two members together using an adhesive.

When bonding with high strength using an adhesive, it is necessary to thoroughly clean the bonding surface.If the bonding surface has an oxidized film, oily content, or moisture, please clean the adhesive after bonding. Easily peels off at the interface between the adhesive surface of the part and the adhesive surface.

In order to prevent such interfacial peeling, methods such as sandblasting to remove the oxide film or ultrasonic cleaning in an organic solvent to remove oily content and water are usually used to clean the adhesive surface. Adhesion is performed after a highly purified virgin surface, but even when adhesive is applied to a surface that has been cleaned in this way in the air, it is necessary to apply adhesive during the preparation period before application. Dust, oil, moisture, etc. in the air adhere to the surface, reducing the adhesive strength at the interface. Therefore, when used in aircraft etc. where many adhesives are used and reliable bonding is required,
Bonding is performed under strict quality control in a vacuum. The present invention provides a method for easily performing such high-strength bonding, and in particular, removes dust, oil components, moisture, etc. that adhere to the bonding surface even though the bonding is performed in the air. It is characterized by being able to be removed and bonded with excellent strength at the interface.

The present invention will be explained in more detail below.

First, the bonding surfaces of the two members to be bonded are sandblasting, ultrasonic cleaning in an organic solvent, or any other arbitrary means to remove the oxide film, as well as oily content and moisture.
Cleanse.

An adhesive is applied to the adhesive surface of the adherend member cleaned in this way in the air. That is, any type of adhesive such as epoxy, rubber, polyurethane, etc. can be used as long as it does not harden during the bonding operation described below.

This adhesive is applied as soon as possible after cleaning the adhesive surface, but since it is handled in the air, even a small amount of foreign matter such as dust, oil components, moisture, etc. may adhere to the adhesive surface. Unavoidable, adhesive will be applied on those foreign objects.

Therefore, when the adhesive is in the unhardened state, the adhesive surface is polished or scraped using an ultrasonic polisher, a sander, etc. to remove foreign substances such as dust, oil, moisture, and oxide film from the adhesive surface. It is removed from above and the adhesive surface is polished or smoothed to some extent.

As a result, the adhesive surface is sufficiently cleaned and a virgin surface is generated while being covered with the adhesive, so no oxide film is formed or moisture is attached to it, and the adhesive surface is completely cleaned using the same method. By bonding with the adhesive surface of another adherend and curing the adhesive, it is possible to achieve a bond with excellent strength that will not peel off at the interface. The problem in this case is that foreign matter such as processing powder generated when the adhesive surface is processed using an ultrasonic polisher or scraper gets mixed into the adhesive, causing stress concentration and destroying the adhesive itself. It is to reduce the strength.

However, the most important problem in stabilizing adhesion is to prevent breakage due to an extreme decrease in strength at the interface, so even if the breakage strength of the adhesive itself is reduced due to the inclusion of foreign matter It is extremely effective to maintain stability in overall strength. Then, when applying adhesive to the bonding surface as described above, if the adhesive is applied in a sufficiently larger amount than is necessary for the original bonding, and the excess amount is removed together with the foreign matter mixed in during bonding. , it is possible to sufficiently reduce the density of foreign substances in the adhesive that is effectively used for bonding, and increase the strength of the adhesive itself.

Additionally, in general, the smaller the surface roughness of the adhesive surface, the greater the adhesive strength, so processing the adhesive surface while the adhesive is applied as described above is extremely effective in increasing adhesive strength. It will work. As detailed above, the bonding method of the present invention does not require special equipment unlike when bonding is performed in a vacuum.
High-strength bonding can be easily achieved simply by using an ultrasonic polisher or scraper. In particular, the bonding surface can be thoroughly cleaned by the polishing action of ultrasonic waves or the smoothing effect of scraping, etc. Since the facets are processed, the adhesive strength at the interface is significantly increased, and the overall adhesive strength is extremely stabilized, allowing the adhesive to demonstrate its full potential.

Claims (1)

[Claims] 1. Apply an adhesive in the air to the adhesive surface of the adherend, and in the uncured state of the adhesive, remove foreign matter from the adhesive surface by polishing or carving the adhesive through the adhesive. . A bonding method characterized in that a virgin surface is generated in a state covered with an adhesive, and then the virgin surface is joined and bonded to another adhesive surface that has been similarly generated with a virgin surface.