PENGARUH FULL ACRYLIC DAN STYRENE ACRYLIC TERHADAP KINERJA LATEKS KARET ALAM SEBAGAI BINDER PADA APLIKASI CAT EMULSI

Arya Wiranata; Heni Sugesti; Trisuciati Syahwardini; Cindy Pakpahan; Putri Rosmawati; Nurhidayah Nurhidayah; Bahruddin Bahruddin

doi:10.22302/ppk.wp.v44i2.1223

Authors

Arya Wiranata Politeknik Negeri Sriwijaya
Heni Sugesti
Trisuciati Syahwardini
Cindy Pakpahan
Putri Rosmawati
Nurhidayah Nurhidayah
Bahruddin Bahruddin

DOI:

https://doi.org/10.22302/ppk.wp.v44i2.1223

Keywords:

binder, cat emulsi, contact angle, full acrylic, grafting, lateks karet alam, crub dan abrasi, styrene acrylic

Abstract

Permintaan cat dalam industri konstruksi terus meningkat, terutama cat emulsi berbasis air yang bergantung pada kualitas bahan pengikat (binder) sebagai komponen utama. Indonesia masih mengandalkan impor binder sintetis, sehingga diperlukan alternatif lokal yang ramah lingkungan. Lateks karet alam merupakan kandidat potensial, namun memiliki kelemahan dalam ketahanan cuaca dan waktu pengeringan. Penelitian ini mengembangkan binder berbasis lateks karet alam yang dimodifikasi dengan resin akrilik (full acrylic dan styrene acrylic) untuk meningkatkan daya rekat, ketahanan abrasi, dan stabilitas cuaca. Modifikasi dilakukan melalui proses pencangkokan menggunakan benzoyl peroxide, SLS, sodium sulfit, dan polipropilen glikol pada suhu 85°C selama 60 menit. Binder hasil modifikasi kemudian dicampur ke dalam cat emulsi dan diuji menggunakan FT-IR spectroscopy, uji ketahanan gosok (scrub) dan abrasi (abrasion) (mengacu pada ASTM D2486 method A), serta pengukuran sudut kontak (contact angle). Hasil menunjukkan peningkatan signifikan dalam performa cat, terutama pada sampel NRL-FA(70:30) dengan kadar binder 15%, yang mampu bertahan hingga 5.500 siklus dan memiliki sudut kontak 87°. Temuan ini menunjukkan bahwa lateks karet alam termodifikasi akrilik berpotensi menjadi alternatif binder berkinerja tinggi untuk aplikasi cat emulsi interior dan eksterior.

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