Possibility of replacing urea formaldehyde resin by soy adhesive in production of plywood

Document Type : Complete scientific research article

Authors

Assistant Prof., Wood and Forest Products Division, Research institute of forests and rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

Abstract

Background and Objectives: Todays, environmental problems of synthetic adhesives such as formaldehyde emission danger for human health cause to consider bio adhesives for wood based composites production by researchers and industries. Human health problems and formaldehyde emission from wood-based composites are some of the major drawbacks of the traditional synthetic adhesives such as urea formaldehyde resins. There have been many attempts to decrease formaldehyde emission and replace urea formaldehyde resins with bio-based adhesives for wood-based composites. Recently, researchers were developed bio based adhesives for wood based product manufacturing with acceptable physical and mechanical properties. These adhesives are totally environment-friendly and they have no gas emission. In this research, feasibility of replacing soy based adhesives by urea formaldehyde resin for plywood manufacturing was investigated.
Materials and Methods: Soy flour and soy protein combined with two types of different hydrolysable tannin and condensed tannin namely chestnut tannin and mimosa tannin by 5 wt% (as cross-linker agents) to produce different soy adhesives. Some properties of soy adhesives were evaluated by thermo-mechanical analyzer and differential scanning calorimetry. The adhesives were tested dynamically by thermomechanical analysis (TMA) on a Mettler 40 apparatus. Thermal transition properties of modified and unmodified soy flour samples were measured with an INNUO DSC 500-B instrument. Also, three ply plywood specimens with Populus deltoides plies were manufactured and their mechanical strength (shear strength) and delamination properties were investigated.
Results: The results obtained from thermo mechanical analysis showed that addition of tannins to soy based adhesives cause to decrease in their gelation time and temperature. Also, results of differential scanning calorimetry analysis showed a decrease in the denaturation temperature of soy protein by tannins addition. The results of plywood mechanical test showed an increase in the shear strength of specimens which prepared with improved-soy based adhesive by tannins as crosslinking agents. Their shear strength were evaluated higher than European standards, EN-314-2, and manufactured plywood by urea formaldehyde resin. Delamination test based on ANSI HPV- HP1 standard, also, showed the lower cyclic water resistance of all types of plywood which manufactured by soy based adhesives without crosslinking agents and, urea formaldehyde resin even indoor condition. But, addition of tannins as crosslinking agent to soy based adhesives, successfully, increased their delamination resistance for indoor and outdoor applications
Conclusion: Based on obtained results, soy adhesives because of acceptable physical and mechanical properties according to EN-314-2, have good potential to replace urea formaldehyde resin for plywood manufacturing.

Keywords

References

 1.Allen, A.J., Marcink, J.J., Wagler, T.A., and Sosnowick, A.J. 2010. Investigations of the molecular interactions of soy-based adhesives. Forest Products J. 60: 6. 534-540.
2.Antov, P., Krišt’ák, L., Réh, R., Savov, V., and Papadopoulos, A.N. 2021.Eco-friendly fiberboard panels from recycled fibers bonded with calcium lignosulfonate. Polymers. 13: 639. https://doi.org/ 10.3390/polym13040639.
3.Bacigalupe, A., and Escobar, M.M. 2021. Soy protein adhesives for particleboard production – A review. J. of Polymers and the Environment. https://doi.org/ 10.1007/s10924-020-02036-8.
4.Charlton, A.J., Baxter, N.J., Lokmankhan, M., Moir, A.J., Haslam, E., Davies, A.P., and Williamson, M.P. 2002. Polyphenol/ peptide binding and precipitation. J.of Agricultural and Food Chemistry.50: 1593-1601.
5.Chen, X., Li, J., Pizzi, A., Fredon, E., Gerardin, C., Zhou, X., and Du, G. 2021. Tannin-furanic foams modified by soybean protein isolate (SPI) and industrial lignin substituting formaldehyde addition. Industrial Crops and Products. 168: 113607, ISSN 0926-6690, https:// doi.org/10.1016/j.indcrop.2021.113607.
6.Chen, X., Pizzi, A., Xi, X., Zhou, X., Fredon, E., and Gerardin, C. 2021. Soy protein isolate non-isocyanates polyurethanes (NIPU) wood adhesives. J. of Renewable Materials, Scrivener publishing, In press, (10.32604/jrm. 2021. 015066).
7.Ghahri, S., Bari, E., and Pizzi, A. 2021. The challenge of environment-friendly adhesives for bio-composites. P 195-229, In: M. Jawaid, T. Ahmed Khan, M. Nasir, and M. Asim (eds), Eco-Friendly Adhesives for Wood and Natural Fiber Composites, Springer, Singapore.
8.Ghahri, S., Chen, X., Pizzi, A., Hajihassani, R., and Papadopoulos, A.N. 2021. Natural tannins as new cross-linking materials for soy-based adhesives. Polymers. 13: 4. 595-610.
9.Ghahri, S., Mohebby, B., Pizzi, A., Mirshokraie, A., and Mansouri, H.R. 2018. Improving water resistance of soy-based adhesive by vegetable tannin.J. of Polymers and the Environment.26: 5. 1881-1890.
10.Ghahri, S., Mohebby, B., Mirshokraie, S.A., and Mansouri, H.R. 2016. The effect of soy-flour mesh size and its adhesive acidity changes on shear strength of plywood. Iranian J. of wood and paper industries. 7: 3. 377-386.
11.Hosseini, B., Ghofrani, M., Taghiyari, H.R., and Ghahri, S. 2019. Effect of soy flour addition to urea-formaldehyde resin on plywood strength properties and formaldehyde emission. Iranian J. of Wood and Paper Science Research.
34: 3. 387-396.
12.Huang, W., and Sun, X. 2000. Adhesive properties of soy proteins modified by sodium dodecyl sulfate and sodium dodecylbenzene sulfonate. J. of the American Oil Chemists Society.77: 7. 705-708.
13.Koupantsis, T., Pavlidou, E., and Paraskevopoulou, A. 2016. Glycerol and tannic acid as applied in the preparation of milk proteins - CMC complex coavervates for flavour encapsulation. Food Hydrocolloids. 57: 62-71.
14.Li, J., Chang, Z., Zhang, B., Li, X., Sun, Z., Pengfei, H., Zhang, S., and Gao, Z. 2019. Effect of ambient aging during soybean meal storage on the performance of a soybean-based adhesive. Industrial Crops and Products. 140: 111725, ISSN 0926-6690, doi.org/10.1016/j.indcrop.2019.111725.
15.Pizzi, A. 2021. Covalent and ionic bonding between tannin and collagen in leather making and shrinking: a MALDI-TOF study. J. of Renewable Materials. 9: 8. 1345-1364. 
16.Sionkowska, A., Kaczmarek, B., and Lewandowska, K. 2014. Modification of collagen and chitosan mixtures by the addition of tannic acid. J. of Molecular Liquids. 199: 318-323.
17.Ghahri, S., and Hajihassani, R. 2021. Use of Modified Soy Adhesive for Manufacturing Fiberboard from Wood and OCC Fiber. Iranian J. of wood and paper industries. 12: 2. 247-257.
18.Taghiyari, H.R., Hosseini, S.B., Ghahri, S., Ghofrani, M., and Papadopoulos, A.N. 2020. Formaldehyde emission in micron-sized wollastonite-treated plywood bonded with soy flour and urea-formaldehyde resin. Applied sciences. 10: 19. 6709-6723.
19.Yin, H., Zheng, P., Zhang, E., Rao, J., Lin, Q., Fan, M., Zhu, Z., Chen, M., Cheng, S., Zeng, Q., and Chen, N. 2020. An environmentally-friendly soybean based resin as an alternative to formaldehyde-based counterpart for biomass composites, International J. of Adhesion and Adhesives. 104: 102755, ISSN 0143-7496, https://doi.org/10. 1016/ j.ijadhadh.2020.102755.
20.Zhu, X., Song, C., Sun, X., Wang, D., Cai, D., Wang, Z., Chen, Y., and Chen, X. 2021. Improved water resistance of TA-modified soy adhesive: Effect of complexation. International J. of Adhesion and Adhesives. 108: 102858, ISSN 0143-7496, https://doi.org/10. 1016/j.ijadhadh.2021.102858.
Journal of Wood and Forest Science and Technology
Volume 28, Issue 3
November 2021
Pages 111-129

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