Castor Oil-Based Polyurethane Resin for Low-Density Composites with Bamboo Charcoal

Abstract

Polyurethane (PU) foam adhesives were prepared from castor oil as a polyol with isocyanate poly (4,4′-methylene diphenyl isocyanate) (PMDI) using a solvent-free process. The NCO/OH molar ratio used for the preparation of PU foams was 1.5. Water, organosiloxane and dibutyltin dilaurate were blowing agent, surfactant and catalyst, respectively. Effects of the ratio of blowing agent and catalyst were adjusted to optimize the properties. The results show that 4 wt% of castor oil of catalyst and blowing agent minimizes water absorption and maximizes volume expansion in the PU foams. FT-IR analysis shows that urethane bond was formed by hydroxyl group of castor oil and –NCO group of isocyanate PMDI. More blowing agent and catalyst could improve the volume expansion ratio and reduce water retention of PU foams. It was found that Moso bamboo charcoal (Phyllostachys pubescens) or/and China fir wood particle (Cunninghamia lanceolate) composites with setting densities of 500 and 600 kg/m3 can be prepared from optimized castor oil-based PU foam adhesive at 100 °C for 5 min under a pressure of 1.5 MPa. Increasing the amount of bamboo charcoal decreases the equilibrium moisture content, water absorption and internal bonding strength of the composite. Notably, bamboo charcoal composite exhibits excellent dimensional stability. The optimized density and bamboo charcoal percentages of the composite were 500 kg/m3 and 50 to 100%. The castor oil-based PU composites containing bamboo charcoal fulfilled the CNS 2215 standards for particleboard. This dimensionally stable, low-density bamboo charcoal composite has high potential to replace current indoor building materials.

Effect of incorporation of lignin as bio-polyol on the performance of rigid lightweight wood–polyurethane composite foams

“…They are widely used in applications that include insulation, construction, decoration, and automotive parts [6,7]. A typical rigid PU foam formulation mainly includes diisocyanate, polyols, blowing agent, catalyst and surfactant [8]. The PU foam is synthesized by the exothermic reaction of polyols with diisocyanates in addition to a mixture of additives [9].…”

Physico-Chemical, Thermal, and Electrochemical Analysis of Solid Polymer Electrolyte from Vegetable Oil-Based Polyurethane

“…Recent studies reported some of the vegetable oils used as raw material for polyol synthesis, including soybean oil [ 5 ], jatropha oil [ 6 ], palm oil [ 7 ], canola oil [ 8 ], linseed oil [ 9 ], and castor oil [ 10 ]. The production of polyol extracted from soybean oil was developed in Europe and America a long time ago and used by industries on a large scale to replace petrochemical polyol.…”

Synthesis and Properties of Moisture-Cured Reactive Polyurethane Containing Castor Oil and Oxime Compounds

“…Moreover, CO 2 -based polyols are another available resource [ 7 ]. Among them, castor oil ( Ricinus communis , ricinoleic acid, s12-hydroxy-9-cis-octadecenoic acid) has hydroxyl groups in the chain without further derivatization, making it suitable for several applications in the synthesis of polyurethane [ 8 , 9 , 10 ].…”