| The Modification of Short Oil Alkyd Resins Prepared from Waste PET by Amino Resins
In this study, Waste polyethylene terephthalate (PET) flakes were depolymerized by using propylene glycol (PG) and dipropylene glycol (DPG) in the presence of zinc acetate as catalyst. Glycolysis reaction products of waste PET obtained by using PET/EG molar ratio 1/2. Glycolysis products were reacted with phthalic anhydride, glycerine, and fatty acid mixture to get short oil alkyd resins (APETPG and APETDPG). Reference alkyd resince were prepared with phthalic anhydride, glycerine, fatty acid mixture, PG or DPG (AREFPG and AREFDPG). The reactions were followed with acid value. Alkyd-amino resins were prepared by mixing of alkyd and amino resins (urea-formaldehyde, melamine-formaldehyde, urea-formaldehyde/melamine-formaldehyde 1/1 w/w) in various proportions (% 70 alkyd-% 30 amino, %60 alkyd-% 40 amino, %50 alkyd-%50 amino). Curing reactions of alkyd amino resin films were carried out at 140oC.
The physical and chemical properties such as drying time, hardness, abrasion resistance, impact resistance, adhesion, water resistance, alkaline resistance, acid resistance, thermal oxidative degradation resistance (with thermogravimetric analysis, TGA) and gelation time of these alkyd-amino resins were investigated. The waste PET based resins were compared with the reference resin and the properties of the waste PET-based resins were found to be compatible with the properties of the reference resins
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