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Properties of Medium-density Composite Particleboard from Creeping Wild Rye and HDPE Plastic

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  076218.(doi:10.13031/2013.23528)
Authors:   Baoguo Li, Zhongli Pan, Yi Zheng
Keywords:   Creeping Wild Rye, High density polyethylene, Mechanical strength, Particleboard, Polymeric methane diphenyl diisocyanate, Water resistance

Creeping Wild Rye (CWR), Leymus triticoides, is a salt-tolerant and perennial grass, which is planted in San Joaquin Valley, California in the USA to lower salt contents from drainage irrigation water to prevent water streams and soil from pollution and alkalization, respectively. In this study, CWR was used as raw materials to manufacture medium-density particleboard. The objective of this research was to characterize the qualities (mechanical properties and water resistance) of CWR particleboards bonded by high density polyethylene (HDPE) from recycled food carrying bags, polymeric methane diphenyl diisocyanate (PMDI) and/or rice bran adhesive (RBA). The evaluated properties of particleboard included tensile strength (TS), modulus of rupture (MOR), modulus of elasticity (MOE), and internal bond strength (IB). Water absorption and thickness swell were used to evaluate the water resistance properties of finished CWR particleboard. The effects of the amount of HDPE, PMDI and/or RBA on the qualities of finished particleboards were determined. The partial PMDI replacement with RBA did not compromise the mechanical quality, but yield lower water resistance. Adding HDPE, however, improved the overall qualities of particleboards. In order to optimize the properties of medium-density particleboard made from CWR and HDPE, an orthogonal experimental design was employed. Results showed that up to 30% PMDI can be replaced by adding 20% HDPE with size of 10×10mm to manufacture the particleboard with higher mechanical strength and the water resistance particleboards than without HDPE.

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