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Influence of NaOH/phenol mole ratio on the structure and performance of Phenol-Urea-Formaldehyde resin

ZHAO Wei-gang~1,DU Guan-ben~1,LEI Hong~1,FANG Qun~2,ZHAO Chao-chao~1 (1.Southwest Forestry College,Kunming,Yunnan 650224,China; 2.Zhejiang Forestry College,Lin'an,Zhejiang 311300,China)  
The structure of phenol-urea-formaldehyde(PUF) co-condensate resin prepared at different NaOH/P mole ratio was studied by carbon 13 nuclear magnetic resonance(~(13)C NMR) spectroscopy and matrix—assisted laser desorption/ionization time—of-flight mass spectrometry(MALDI-TOF-MS).Then the influence of NaOH/P mole ratio on the performance of PUF resin was further evaluated by preparing the PUF-bonded plywood panel.~(13)C NMR spectroscopy and MALDI-TOF-MS indicated that the structure of PUF resins is similar at different NaOH/P mole ratio.Evaluation of laboratory plywood showed that the dry and wet strength obviously increase with the NaOH/P mole ratio within a certain value.The mole ratio of NaOH/P should be less than 0.53,mole ratio over this value can cause the performance of PUF resin to be decreased drastically,but is also acceptable.
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