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| Synthesis of a New Melamine-urea-formaldehyde Resin —Preparation of MUF with Degradated Liquid of Soy-Protein and Concentrated Formaldehyde |
Zhigang WU1,2,Xuedong XI2,Ming CAO3,Hui WANG2,Hong LEI2,Bengang ZHANG2,Guanben DU2,**( ) |
1. College of Matericals Science and Technology, Beijing Forestry University, Beijing 650224, China
2. Wood Adhesives and Glued Products Key Laboratory of Yunnan Province, Southwest Forestry University, Kunming 650224, China
3. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China |
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Cite this article:
Zhigang WU,Xuedong XI,Ming CAO,Hui WANG,Hong LEI,Bengang ZHANG,Guanben DU. Synthesis of a New Melamine-urea-formaldehyde Resin —Preparation of MUF with Degradated Liquid of Soy-Protein and Concentrated Formaldehyde. Chinese Journal of Materials Research, 2015, 29(11): 814-820.
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Abstract A new melamine-urea-formaldehyde (MUF) resin was prepared with concentrated formaldehyde and degradated liquid of soy-protein as raw materials . The molecular structure and thermal mechanical properties of MUF resin were characterized by 13C-NMR, FT-IR and DMA. The prepared MUF resins were used as bonding material to fabricate particleboards and then their bonding strength and modulus of rupture(MOR)as well as free formaldehyde content were also examined. The results show that with the MUF resin synthesized merely with concentrated formaldehyde (hereinafter named MUF resin-F), the bonding strength and MOR of the fabricated particleboard increased by 25% and 64%, and the free formaldehyde content decreased by 52%; however, with the MUF resin synthesized jointly with concentrated formaldehyde and degradated liquid of soy-protein (herinafter named MUF resin-FP), the bonding strength and MOR of the fabricated particleboard increased by 48% and 97% respectively, and the free formaldehyde content decreased by 56%. The FT-IR results indicated that the degradated liquid of soy-protein did react with MUF. 13C-NMR and DMA results indicated that the MUF resin-F has high amount of ether bond and high condensation degree, high initial strength and low thermal stability; in the contrast, the MUF resin-FP has high condensation degree and high amount of methylene bridge bond, which can offset the instability induced by the fracture and rearrangement of ether bonds. In sum, the newly synthesized MUF resin-FP possesses good thermal mechanical properties, high strength and low free formaldehyde content.
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Received: 22 March 2015
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| Fund: *Supported by National 12th Five Years-sciences Supporting Proposal No. 2012BAD24B03, Yunnan Provincial Fund Project No.2014Y318 and Special Fund for Forestry Scientific Research in the Public Welfare No. 201304505. |
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