Adhesive procuction from cashew nut shell liguid

Abstract

The adhesive production form CNSL was produced in the basic condition by using sodium hydroxide as catalyst. The molar ratio between sodium hydroxide and anacardic acid was 0.1. The amount of formalin was varied from 20 to 35 per cent by weight of CNSL with the refluxing time of 10-40 minutes. The resulting resin was resol type which could be used in bonding of plywood to plywood. The optimum condition to produce the resol resin was abtained when the formalin concentration was 20 percent, molar ratio of formaldehyde and anacardic acid was 1.04, and the refluxing time was 40 minutes. The condition for curing it was dry-laminating and 10 minutes cold pressing. It showed shear strength of 18.6 kg/cm2 which was closed to the one with wet-laminating, 18.0 kg/cm2. In addition, the adhesive of 35 per cent of formalin and 10 minutes refluxing gave the best shear strength as the hot-setting adhesive. The adhesion characteristics of nylon-6 fabric to compounded natural rubber were evaluated at various conditions. It was founded that the adhesion between those substrates was less satisfied when the adhesive was employed.