Sains Malaysiana 51(9)(2022): 3019-3025

http://doi.org/10.17576/jsm-2022-5109-22

Cyclical Aging Tests in Latex Coating with TiO₂ Nanoparticles by UVb Radiation

(Ujian Berkitar Penuaan dalam Salutan Lateks dengan Nanozarah TiO₂ oleh Sinaran UVb)

JENNY MIRIAM FERNANDEZ-VIVANCO^1,*, CÉSAR EDUARDO JIMÉNEZ-CALDERÓN², ALDO JAVIER GUZMAN-DUXTAN³ & CARLOS ALBERTO LEVANO-HUAMACCTO⁴

¹Quantum Chemistry and New Materials for Technological Innovation, Faculty of Medicine, National University of San Marcos, Lima, Peru

²César Vallejo University, Lima, Peru

³Department of Physics-chemistry, Faculty of Chemistry and Chemical Engineering,

National University of San Marcos, Lima, Peru

⁴Faculty of Natural Sciences and Mathematics, National University of Callao, Peru

Diserahkan: 14 November 2021/Diterima: 26 Mac 2022

Abstract

This study evaluated the properties of adhesion, cracking, rusting, and accumulated irradiance on the surface of four vinyl acrylic resin coatings. QUV accelerated aging technique was applied. The coatings accumulated irradiance in cyclic form and was controlled by the tests of atmospheric temperature and relative humidity. A paper money currency validator counterfeit has been used because of its constant irradiance of 1,41 mW/cm²; a power of 9 W of UV radiation; 220 V, ranging an equipment temperature (OPALUX) between 40 °C and 60 °C. Irradiance has been measured by using the UV light meter equipment model YK-35UV (2 to 20 mW/cm²). Latex coatings embedded with TiO₂ nanoparticles and prepared in four different formulations with CaCO₃ plus Diatomite were applied on a surface area of 5.5 cm length times 1.5 cm width. The exposition time ranged from 56 to 500 h of irradiance at a period span of eight h each day.  Coatings were altered on its properties of adhesion, elasticity and photooxidation on their surface.

Keywords: Aging technique; irradiance; latex coating; TiO₂ nanoparticle

Abstrak

Kajian ini menilai sifat lekatan, keretakan, pengkaratan dan sinaran yang diterima pada permukaan empat salutan resin akrilik vinil. Teknik penuaan dipercepatkan QUV telah digunakan. Salutan menerima sinaran dalam bentuk kitaran dan dikawal oleh ujian suhu atmosfera dan kelembapan relatif. Pengesahan mata wang kertas palsu telah digunakan kerana sinaran malar 1,41 mW/cm²; kuasa 9 W sinaran UV; 220 V, dengan julat suhu peralatan (OPALUX) antara 40 °C dan 60 °C. Sinaran telah diukur menggunakan model peralatan meter cahaya UV YK-35UV (2 hingga 20 mW/cm²). Salutan lateks yang dibenamkan dengan nanozarah TiO₂ dan disediakan dalam empat rumusan berbeza dengan CaCO₃ dan Diatomit telah digunakan pada kawasan permukaan 5.5 cm panjang × 1.5 cm lebar. Masa dedahan adalah antara 56 hingga 500 jam penyinaran pada jangka masa lapan jam setiap hari. Salutan telah diubah pada sifat lekatan, keanjalan dan fotooksidasi pada permukaannya.

Kata kunci: Nanozarah TiO₂; salutan lateks; sinaran; teknik penuaan

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^*Pengarang untuk surat-menyurat; email: Jenny.fernandez@unmsm.edu.pe