Synthesis of hot melt adhesive by using hexamethylene diisocyanate / Nur Aqieemah R.A Sharifudin

Synthesis of hot melt adhesive based on aliphatic isocyanate which is hexamethylene diisocyanate (HDI) was prepared. Crude palm oil (CPO) was used as replacing petroleum as source of polyurethane production. The polyurethane is prepared by two stages: preparation of unsaturated alkyd resin by using palm oil and polyurethane synthesis. The first stage is by mixing the palm oil with LiOH and heat to 220°C then added glycerol, lastly added potassium hydrogen phthalate. The second stage is when previous mixture is added with HDI and stir for three hours. The polyurethane synthesize with HDI then be compared with polyurethane synthesize with toluene diisocyanate (TDI) and isophorone diisocyanate (IPDI). The polyurethane then was analyzing using Fourier transform infrared (FTIR) and Thermogravimetry analysis (TGA). The FTIR spectrum show peaks at 1709 cm-l, 1537 cm-l and 1243 cm-l for C=O stretching, N-H deformation and C-N stretching respectively. The TGA result show that the first decomposition occurs at 170°C and the total percentage weight loss is 95 %. In comparison to PU-TDI and PU-IPDI, the spectrum of PU-HDI show low intense compare to PU-TDI and PU-IPDI meanwhile PU-HDI show high thermal stability than PU-TDI and PU-IPDI.