Effect of UV Irradiation on the Color and Chemical Structure of PMDI Cured with Water
Introduction The durability of wood-based materials is greatly affected by the durability of the adhesives used. Recently, polymeric diphenylmethane diisocyanate (PMDI) has come to be used instead of formaldehyde-based adhesives. Concomitantly, the durability and degradation of PMD! has become of interest. Generally, heat and moisture are the most serious degradation factors for wood adhesives, in an actual environment, however, various degradation factors including those factors would be at play. it is empirically known that the color of PMDI used as a wood adhesive changes quickly under sunlight. It is possible that this color change has adverse effects, leading to the degradation of the PMDl. When PMDi is used as a wood adhesive, the isocyanate-water reaction is considered to be one of the most important curing reactions. Accordingly, the effect of UV light irradiation on the color and chemical structure of water-cured PMDi was investigated using a UV long-life fade meter. The same treatment except for UV light irradiation was performed using a thermohygrostat for the purpose of comparison.
K.Umemura H.Yamauchi T.Ito M.Shibata S.Kawai
Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan Institute of Wood Technology, Akita Prefectural University, Akita, Japan Mitsui Chemicals Polyurethanes Inc., Chiba, Japan
国际会议
International Symposium on Wood Science and Technology(IAWPS 2008)(国际木材产品学会联合会2008学术研讨会)
哈尔滨
英文
437-438
2008-09-27（万方平台首次上网日期，不代表论文的发表时间）