Particleboard From Rubber Wood Flakes with Polymeric MDI Binder
Keywords:Particleboard, polymeric MDI, wood flakes, binder
AbstractThe use of rubber wood (Hevea brasiliensis) flakes for particleboard with polymeric diisocyanate (pMDI) as a binder was investigated. The effects of binder content in surface/core layers, cure temperature, cure time, and flake moisture on the properties of rubber wood particleboards were studied. The properties of the particleboard were compared with those of phenol-formaldehyde (PF) binder. The particleboard prepared from rubber wood flakes with pMDI binder gave high quality particleboards that had durability under severe conditions, low water absorption and thickness swelling, and a high modulus of rupture, modulus of elasticity, and internal bond strength. Moreover, pMDI binder could be cured at low temperatures, within a short time, and the binder consumption was small. The scanning electron micrographs of the rubber wood particleboard prepared from the high moisture content flakes showed the best, very tight packing characteristics.
Akers, L. E. 1966. Particleboard and handbook, Vol. 4. Blakie & Sons, London, UK. P. 172.nCanadian Standards Association. 1978. Standard Test Methods for Mat-Formed Wood Particleboards and Waferboard. CSA Standard, CAN 3-01880.0-M78. 32 pp.nChen, R., and Q. Wu. 1994. Modified lignosulfonate as adhesive. J. Appl. Poly. Sci. 52:437-443.nDeutsche Norm. 1990. Flat press particleboard for use in building construction: concepts, requirements, testing and inspection. DIN 68763. 8 pp.nDix, B., and R. Marutzky. 1989. Modification of diisocyanate-based particleboard and plywood glues with natural polymers: polyphenols, carbohydrates and proteins. Pages 229-241 in M. J. Comstock, ed. Adhesive from renewable resource. American Chemical Society, Washington, D.C.nFranke, J., M. Kappe, K. Recker, H. Reiff, H. D. Ruprecht, and H. I. Sachs. 1994. Polyurethane (PUR) systems and polyisocyanates as starting materials for binders. Pages 615-628 in G. Oertel, ed. Polyurethane handbook. Hanser Publisher, New York, NY.nHolfinger, M. S., A. H. Conner, L. F. Lorenz, and C. G. Hill, Jr. 1993. Difurfuryl diisocyanates: New adhesives derived from renewable resources. J. Appl. Poly. Sci., 49:337-344.nThai Industrial Standard. 1989. Standard for Flat Pressed Particleboards: Medium Density. TIS 876-2532. 30 pp.nWendler, S. L., and C. E. Frazier. 1996. The effects of cure temperature and time on the isocyanates-wood adhesive bondline by 15N CP/MAS NMR. Int. J. Adhesion and Adhesive 16:179-186.nWood, G. 1990. IC1 Polyurethane, 2nd ed. John Wiley & Sons, New York, NY. P. 364.nYoungquist, J. A. 1992. The role of matrix, fiber and interface, Pages 383-401 in J. L. Vigo and B. J. Kinzig, eds. Composite applications, VCH Publisher, New York, NY.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.