BERDAN KALAV, Ezgi ISMAR, BURÇAK KARAGÜZEL KAYAOĞLU

Enhancing the Flame Retardancy of UV Curable Polyurethane Acrylate Coated Films with Alumina Trihydrate Filling

In this study, the flame retardancy of ultra violet (UV) curable polyurethane acrylate (PU) coated filmswere enhanced. For this aim, alumina trihydrate (ATH) filling material was mixed with the pastes includinga photoinitiator and a UV curable PU. ATH filling ratio was preciously adjusted to obtain a uniform coating.The coated films were cured with a UV curing system equipped with gallium (Ga) and mercury (Hg) lamps.The chemical changes and the curing degree of the UV cured films were examined by a Fourier TransformInfrared Spectrum (FTIR) and a pendulum hardness tester. The thermal properties of the UV cured filmswere evaluated using a Differential Scanning Calorimeter (DSC). Moreover, vertical flammability andlimiting oxygen index (LOI) measurements were conducted in order to determine the burning behavior ofthe UV cured films. The successful curing of the films was evidenced by means of FTIR results. Theaddition of ATH slightly increased the hardness values of the films. DSC results showed that ATH additionnot only increased the enthalpy values but also enhanced the flame retardant property of the coated filmsand maximum LOI was achieved as 31.5%.

Ultraviyole (UV) Işıma ile Kürlenebilen Poliüretan Akrilat Kaplama Filmlerin Alev Geciktirici Özelliğinin Alümina Trihidrat Dolgu Malzemesi Kullanılarak İyileştirilmesi

Bu çalışmada, ultraviyole (UV) ile kürlenebilen poliüretan akrilat (PU) kaplama filmlerin alev geciktirici özelliği iyileştirilmiştir. Bu amaçla alümina trihidrat (ATH) dolgu malzemesi, bir fotobaşlatıcı ve UV ile kürlenebilen PU içeren pat ile karıştırılmıştır. ATH dolgu oranı düzgün bir kaplama elde edilecek şekilde hassas olarak ayarlanmıştır. Kaplanmış filmler galyum (Ga) ve civa (Hg) lambaları ile donatılmış bir UV kürleme sistemi ile kürlenmiştir. UV ile kürlenen filmlerin kimyasal değişimleri ve kürlenme derecesi Fourier Transform Infrared Spektroskopisi (FTIR) ve pendulum sertlik test cihazı ile incelenmiştir. UV ile kürlenen filmlerin termal özellikleri Diferansiyel Taramalı Kalorimetre (DSC) kullanılarak değerlendirilmiştir. Ayrıca, UV ile kürlenen filmlerin yanma davranışını belirlemek için dikey yanma ve sınırlı oksijen indeksi (LOI) ölçümleri yapılmıştır. Filmlerin başarılı bir şekilde polimerleştirilmesi FTIR sonuçları ile kanıtlanmıştır. ATH'nin eklenmesi, filmlerin sertlik değerlerinin az bir miktar artmasına sebep olmuştur. DSC sonuçları, ATH ilavesinin sadece entalpi değerlerini artırmakla kalmayıp, aynı zamanda kaplanmış filmlerin alev geciktirici özelliğini de artırdığını göstermiştir ve maksimum LOI değeri % 31,5 olarak elde edilmiştir.

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