Duncan, B C; Mera, R D; Leatherdale, D*; Taylor, M*; Musgrove, R* (2005) Techniques for characterising the wetting, coating and spreading of adhesives on surface. NPL Report. DEPC-MPR 020

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Abstract

In bonding operations it is vital that the adhesive coating is applied in the correct locations and spreads over roughened surfaces sufficiently to bond. Incorrectly applied adhesive can weaken the bond. Hardening of the adhesive, whether due to cooling, drying or cure reactions before bond formation, overspreading or over-absorption into permeable materials can weaken the subsequent joint.
This report describes techniques for characterising the properties of surfaces that influence the interactions between the substrate and adhesive during the bonding process. It describes methods for assessing substrate wettability and surface energy, surface absorbency, surface receptivity and application and spreading monitoring. Good wettability of a surface is a prerequisite for ensuring good adhesive bonding. Methods for measuring the contact angle of hot melt adhesives have been developed and compared with water drop contact angle measurements. Improvements to the Dennison wax test are also described.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	DEPC-MPR 020
Subjects:	Advanced Materials Advanced Materials > Adhesives
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/3172

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