Preparation of Urea Formaldehyde Resin by Different Processes and Its Application in Particleboard
In order to explore the impact of different F/U molar ratios on UF resins under the same preparation process,four different molar ratios of 0.9,1.0,1.05 and 1.1 were used to prepare UF resins to analyze the physical and chemical properties of UF resins.In order to better explore the applicability of UF resins,particleboards were prepared and their mechanical properties were analyzed.The results showed that the comprehensive performance was the best at the molar ratio of 1.05.Under the optimal process,the free formaldehyde mass fraction of UF resin was 0.21%,and the MOR and MOE of particleboard were 14.07 MPa,1 933 MPa,IB was 0.48 MPa,and the formaldehyde emission was 2.1 mg·(100 g)-1.The prepared particleboard met the national standard P2 type.This study provides a scientific basis for the preparation process of UF resin and the practical application and production of particleboard.
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