Experimental Study on the Adhesion of Rubber Sap Adhesive with NaOH on Wood Surface Khairul Anam (a*), Moch. Syamsul Ma’arif (a), Anindito Purnowidodo (a), Murfid Muzakki Septianto (a)
a) Mechanical Engineering Department, Brawijaya University
Jl. MT Haryono 167, Malang 65145, Indonesia
*khairul.anam27[at]ub.ac.id
Abstract
The tensile strength of rubber sap additive with different NaOH concentration was studied on the wood surfaces. The adhesives were cured at room temperature for different curing times (3, 6, and 12 hour) with NaOH concentrations of 0 wt%, 5 wt%, and 10 wt%. The results shown that the tensile strength of the adhesive joint increased when the NaOH concentrations and curing times is increasing. This evidence can be easily explained by investigating the water content in the adhesive. The highest tensile strength of 0.259 MPa occurred when the NaOH concentrations and curring time of 5 wt% and 12 hours, respectively. However, this value is remained low compare to synthetic adhesives. In addition, from images of adhesives after breaking of samples, the failure mode of the adhesive joint is dominated by adhesive failure.
Keywords: Tensile strength; Rubber sap adhesive; NaOH; Curing time
