Development of Synthetic Sizing Agent Using Recycling Polyethylene Terephthalate and its Sizing Efficiency (Part 2) - Sizing efficiency of modified PET -

재활용 PET를 활용한 합성 사이즈제 개발 및 종이의 내수성 부여에 관한 연구 (제2보) - 개질 PET의 내수특성 평가 -

  • Park, Jae-Seok (Dept. of Forest Product & Biotechnology, Kookmin University) ;
  • Kim, Hyoung-Jin (Dept. of Forest Product & Biotechnology, Kookmin University)
  • 박재석 (국민대학교 삼림과학대학 임산생명공학과) ;
  • 김형진 (국민대학교 삼림과학대학 임산생명공학과)
  • Received : 2010.06.03
  • Accepted : 2010.06.22
  • Published : 2010.06.30


For the development of higher-sizing performance of paper, a sizing agent using recycled PET was synthesised. Polyester resin was extracted from wasted PET by subcritical hydrolysis and finally modified to synthetic sizing agent by mixing water-disperse PET with triphenyl phosphite(TPP). The modified PET was considered as an internal sizing agent in different wet-end papermaking conditions. The optimum condition in sizing efficiency was obtained in initial pH of 6.5 in case of rosin+alum system, and 7.5 in case of rosin+alum+PET system, respectively, and in addition amount of PET 3%. The sizing efficiency was also closely related according to the fiber properties of wet-end slurry, such as virgin fibres from UKP and recycled fibres from KOCC. The application of modified PET was good in strength improvement of paper, specially in tensile strength.


  1. Blumchein H. W., Plast Europe, 605, Oct (1992).
  2. Carrier K., Technology for Recycling Post-Consumer and Industrial Waste Plastic into New, High Quality Product. Proceedings of the ANTEC p. 1807-1808 (1989).
  3. Sasse F. and Gerhard E., Chemical Recycling of Polymer Material, Chem. Eng. Technol., 21(10), p. 777-789 (1998).<777::AID-CEAT777>3.0.CO;2-L
  4. Zou, Y., Hsieh, J. S., Wang T. S., Mehnert E. and Kokoszka J., PET polyester resins used in the wet end at neutral-alkaline papermaking conditions, Tappi J, 4(6), p. 27-32 (2005).
  5. Wang, T. S., Hsieh, J. S., Pellitier, P. and Kokoszka, J., The recyclability of papers treated with environmentally friendly PET polyester, Tappi J, 5(1), p 27-32 (2006).
  6. Wang, T. S. and Pelletier, P., Sizing paper by wet-end addition of water dispersibility polyester, U.S. Pat. Disclosure 2003-127210 (2003).
  7. Park, J. S. and Kim, H. J., Development of synthetic sizing agent using recycling polyethylene terephtahalate and its sizing efficiency (Part 1), J. of KTAPPI 40(4), p. 27-33 (2008).
  8. Jacques, B., Devaux, J., Legras, R. and Nield, E., Reactions induced by tryphenyl phosphite addition during melt mixing of PET/PBT blends: chromatographic evidence of a molecular weight increase due to the creation of bonds of two different natures, Polymer, 38(21), p. 5367-5377 (1997).
  9. Lee, H. L., Fundamentals of Rosin and Alkaline Sizing, J. of KTAPPI 21(1), p. 32-38 (1989).