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Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (2): 126-132.doi: 10.3969/j.issn.0253-2417.2018.02.017

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Synthesis Mechanism of Tris(2-hydroxyethyl)isocyanate Modified Melamine Formaldehyde Impregnated Resin

WANG Rongxing1, ZHANG Zuxin1, CHEN Riqing1, WANG Chunpeng1,2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. of Forest Chemical Engineering, SFA;Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
    2. Research Institute of Forestry New Technology, CAF, Beijing 100091, China
  • Received:2018-03-02 Online:2018-04-25 Published:2018-04-28

Abstract: The tris(2-hydroxyethyl)isocyanate(THEIC) modified melamine formaldehyde(MFT) impregnated resin was prepared with THEIC, melamine(M) and formaldehyde(F) as raw materials. The MFT resin could achieve the requirements of GB/T 14732-2006. The stability of MFT resin was significantly improved with THEIC, as the n(THEIC)/n(F) was 10% or 15%. MFT resin(n(F)/n(M)=1.85 and n(THEIC)/n(F)=15%) remained highly transparent up to 24 days, and its free formaldehyde was only 0.05%. Infrared characterization of MFT resin analysis showed that the absorption peaks of carbonyl functional groups of MFT resin changed to 1680.9 cm-1 from 1670.7 cm-1 in THEIC. The CN absorption peak in melamine ring was 1525.7 cm-1, and split up into two peaks(1545.3 and 1504.0 cm-1) in MFT resin. 13C NMR qualitative and quantitative analysis the reaction process of the MFT resin showed that the hydroxymethyl of amino in melamine was the main reaction and accompanied with the etherification reaction (between hydroxymethyl, hydroxymethyl and THEIC). The main reaction products were oligomers. The joining of the THEIC made the reverse reaction of the condensation of amino and hydroxyl groups, which was hydrolysis reaction,and proved that the resin storage period increased.

Key words: tris (2-hydroxyethyl) isocyanate, modified melamine formaldehyde resin, decorative paper impregnated resin

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