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STUDY ON PREPARATION AND PROPERTIES OF E1-TYPE UF RESIN MODIFIED WITH MELAMINE

Chunpeng Wang

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Abstract

Effects of preparation technology of urea-formaldehyde resin modified with melamine(MUF)on property of plywood were studied.Results showed that formaldehyde emission of plywood conformed to E1 degree(≤1.5 mg/L) when formaldehyde/urea molar ratio was 1.1∶1 and F/U molar ratio in weak acid stage was lower than 1.6∶1.The bond strength of plywood using MUF resin in which content of melamine was beyond 3% did not satisfy to the requirement of type Ⅱ plywood (0.7 MPa).It was possible to decrease formaldehyde emission and improve bonding strength by adding 1% isocyanate curing agent in curing stage.Plywood,decorative plywood and blockboard manufactured with this MUF resin conformed to E1 degree required by standard.

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What this paper is about

Effects of preparation technology of urea-formaldehyde resin modified with melamine(MUF)on property of plywood were studied.Results showed that formaldehyde emission of plywood conformed to E1 degree(≤1.5 mg/L) when formaldehyde/urea molar ratio was 1.1∶1 and F/U molar ratio in weak acid stage was lower than 1.6∶1.The bond strength of plywood using MUF resin in which content of melamine was beyond 3% did not satisfy to the requirement of type Ⅱ plywood (0.7 MPa).It was possible to decrease formaldehyde emission and improve bonding strength by adding 1% isocyanate curing agent in curing stage.Plywood,decorative plywood and blockboard manufactured with this MUF resin conformed to E1 degree required by standard.

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Available abstract

Effects of preparation technology of urea-formaldehyde resin modified with melamine(MUF)on property of plywood were studied.Results showed that formaldehyde emission of plywood conformed to E1 degree(≤1.5 mg/L) when formaldehyde/urea molar ratio was 1.1∶1 and F/U molar ratio in weak acid stage was lower than 1.6∶1.The bond strength of plywood using MUF resin in which content of melamine was beyond 3% did not satisfy to the requirement of type Ⅱ plywood (0.7 MPa).It was possible to decrease formaldehyde emission and improve bonding strength by adding 1% isocyanate curing agent in curing stage.Plywood,decorative plywood and blockboard manufactured with this MUF resin conformed to E1 degree required by standard.

Key concepts: Melamine, Urea-formaldehyde, Formaldehyde, Chemistry, Molar ratio, Isocyanate, Curing (chemistry), Adhesive

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