Polish version

Login form

register


Print

B. Kujawa-Penczek, J. Menes


The effect of chemical composition on some selected properties of hot-melt polyurethane adhesives


Polimery 1989, No 9, 410



DOI: dx.doi.org/10.14314/polimery.1989.410

Summary

A series of copolyesterurethanes (KPEUR) have been synthetized from toluylene diisocyanate and a mixture of adipic and terephthalic polyesterdiols. The effect of the glycol component in adipic polyesterdiol (ethylene, 1,4-butylene and 1,6-hexylene glycols have been used), amount and kind of synthetic resin added (coumaron resin, p-tert-butylphenol-formaldehyde resin, modified bisphenol A - formaldehyde resin) and crystallization nuclei (talc, active silica, chalk) on the softening temperature Tm and initial and final strength of wood-wood adhesive joints has been investigated. The decisive factor is that of glycol component; the highest value of initial strength and Tm is obtained (without additives) with polyesterdiol from 1,6-hexylene glycol. This is probably connected with the highest tendency to crystallization of the corresponding KPEUR. An advantageous effect of resins an the initial strength has been observed only in the case of KPEUR from polyesterdiol -based on 1,4-butylene glycol — in this case the initial strength is also increased by the crystallization nuclei. The final strength of adhesive joints, both without and with additives, is much higher than their initial strength.


If you are interested in full versions of articles, please contact the editorial team of polimery@ichp.pl