Sugarcane bagasse and castor oil polyurethane adhesive-based particulate composite

Abstract

This paper discusses the potential use of sugarcane bagasse in two different fiber lengths (5 mm and 8 mm) of the same density as a raw material for the production of particleboards, using castor oil-based two-component polyurethane adhesive. The quality of the product that can be manufactured industrially was evaluated based on density, thickness swell (TS), absorption (WA), modulus of elasticity (MOE), modulus of rupture (MOR) in static bending and internal bond (IB), according to the Brazilian NBR 14.810:2006 standard. The results revealed a significant difference between the particleboards made with 5-mm-long fibers and those made with 8-mm-long fibers. An analysis by scanning electron microscopy (SEM) indicates that the interparticle spaces are filled with castor oil-based two-component polyurethane adhesive, contributing to improve the physicomechanical properties of the particleboards. A durability assessment based on accelerated aging tests shows that waterproofed particleboards can be used in moist environments.

Particleboard manufactured from Tauari (Couratari oblongifolia) wood waste using castor oil based polyurethane resin

“…The average WA values of particleboards treated at 110ºC and 130°C indicate that these temperatures are suitable for obtaining high density Tauari wood particleboards 40 . These results are consistent with those obtained by Fiorelli et al 45 for particleboards made with COPR and sugarcane bagasse fiber and Pinus sp. and by Bertolini et al 46 and Iwakiri et al 32 for boards made of Tauri wood using ureia formaldehyde resin as adhesive.…”

Hybrid Sandwich Particleboard Made with Sugarcane, Pínus Taeda Thermally Treated and Malva Fibre from Amazon

“…Although the statistical analyses show different means for thickness swelling at 2h, all treatments attend the standard limit, except for Treatment E which reaches 16.8 (group c). Fiorelli et al 31 have investigated the thickness swelling of sugarcane particleboards containing 5 and 8 mm fibre lengths impregnated with castor oil resin. The lowest swelling of 20% has been achieved for 8mm fibres.…”

Mechanical properties of castor oil polymer mortars

“…According to Table 2 it can be seen that, as happen to synthetic polymer mortars, epoxy and polyester 26 , increasing the quantity of resin content mechanical properties increase. Increasing from 10% to 12% of resin content compressive strength increases 16.6%, an elevation of 15.9% in the flexural strength is observed, 6% in the fracture toughness increment and 98.5% increase in the fracture energy is reported.…”

“…Castor oil can be synthetized as polyurethane resins, which are attractive due to their structural versatility (as elastomer, thermoplastic, thermosetting, rigid and flexible foams). They still present the particularity to be more compatible to vegetable fibers in relation to other resins, due to possible reaction of hydroxyl groups of the fibers and the isocyanate groups of the polyurethane [22][23][24][25][26][27] . The proposal of this work is to study the mechanical properties, compressive, flexural and fracture, of polymer mortars manufactured with a polyurethane resin derived from castor oil and compare to synthetic polymers.…”