Adhesive application method in MDI-UF particleboard manufacture |
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Authors: | Weihong Wang Xianquan Zhang Renshu Lu |
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Institution: | (1) Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin, 150040, China |
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Abstract: | Chinese wood-based composite manufacturers are plagued with serious formaldehyde emission (F-emission) problems. In this study,
we investigated the use of an emulsifiable diphenylmethane-4, 4′-diisocyanate (MDI) — urea formaldehyde (UF) mixture adhesive
in particleboard manufacture, in order to decrease F-emission to below 9 mg per 100 g board. We paid close attention to the
effect of NH4Cl on MDI-UF curing and the method of adhesive application by differential scanning calorimetric (DSC) analysis and compared
mechanical properties. Both results showed that the acidic agent NH4Cl did hinder EMDI-UF curing and it also affected the adhesive application method. We are of the opinion that when EMDI and
UF are mixed first, without adding NH4Cl and then sprayed onto particles, mechanical properties will be improved and F-emissions will meet E1 grade requirements.
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Translated from Scientia Silvae Sinicae, 2005, 41(2) 译自: 林业科学, 2005, 41(2)] |
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Keywords: | UF-MDI adhesive mixture formaldehyde emission particleboard curing agent separate application mixing application |
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