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Underwater Adhesive Curing Time Cut from a Day to One Minute

Posted on 4/29/2021 9:42:33 AM By ASC
  

Researchers at the Johns Hopkins Applied Physics Laboratory (APL) have discovered a way to increase the effectiveness and efficiency of underwater adhesive usage in the maritime sector by shortening the protracted curing time which currently calls for about 24 hours in submersion.

The team reports that by adding a catalyst to make the adhesive bond quickly and a crosslinker to strengthen the bond, the curing process can be shortened to as little as one minute. However, if left to cure for the full 24 hours, the hold of adhesives including the additives will be 10 times stronger.

The research team reports the catalyst and crosslinker can be added to the formulation of a new adhesive, or to existing adhesives, for use on a variety of surfaces such as glass, plastic, aluminium, and stainless steel The additives are added in the form of a white powder which is enclosed in an egg-like microcapsule. When given a little pressure, the capsule breaks, and allows the additive to leak out, and the adhesive to solidify.

According to the researchers initial attempts to add the catalyst and crosslinker directly led to the cure beginning immediately. This made it difficult for any last minute changes or extra applications, while the egg approach provides a small but necessary gap before the start of the cure, so enabling changes and additions to be done.

More HERE (plus a video)