The use of natural rubber to resist bitumen is usually prone to degradation and aging. One method to overcome this problem is the addition of antioxidants. This study aims to determine the effect of the addition of antioxidants 1,2-dihydro-2,2,4-trimethyl-quinoline (TMQ) on natural rubber modified asphalt crepe rubber and its performance in short-term and long-term aging conditions. The modified rubber asphalt mixture’s manufacture begins by melting the crepe rubber at 200 °C before being mixed in asphalt at 165 °C. Addition of antioxidant TMQ during the stirring process of the mixture of asphalt and melted rubber. The crepe rubber content was 8, 10, and 12% w/w, while the TMQ content was 1, 2, and 3% w/w of the total sample weight. The modified asphalt samples’ characterization included penetration, softening point, weight loss after a rolling thin film oven test (RTFOT), penetration after RTFOT, and Marshall test. Review of the performance of asphalt under short-term aging conditions using a dynamic shear rheometer (DSR). Evaluation of asphalt performance under long-term aging conditions using Fourier-transform infrared spectroscopy (FTIR). The results showed that the fact that the best-modified asphalt product was the addition of 10% crepe rubber and 2% TMQ. The best-modified asphalt characteristics have penetration 68.70 dmm, softening point 55.45 °C, weight loss only 0.0579%, penetration after RTFOT 59.60, Marshall stability 1403.96 kg with optimum asphalt content of 5.50%, and rutting factor (G*/Sinδ) 6.91 kPa and 16.1 kPa before and after RTFOT. Overall, the modified crepe rubber asphalt can improve the performance of the asphalt in terms of durability. Simultaneously, the antioxidant TMQ works very well in increasing the resistance of bitumen to aging in the conditions of short-term aging and long-term aging.
The direct use of natural rubber latex (NRL) as a binder for emulsion paints did not produce emulsion paints with good opacity, washability resistance, and regulated touch drying time, even when mixed with polyvinyl acetate (PVAc). This study aimed to study the properties of opacity (hiding power), washability resistance, and set drying touch time of emulsion paint with a binder added from a mixture of modified natural rubber latex (NRL) and PVAc. NRL modifications included UV photodepolymerization with TiO2 catalyst and grafting copolymerization of methyl methacrylate and styrene (NRL-g-(MMA-co-St)). NRL was mixed with PVAC at ratios of 0/100; 15/85; 25/75; 35/65; 50/50; 100/0% w/w before being used as a binder for emulsion paint. Emulsion paint samples had different binder contents, namely 2, 4, 6, and 8% w/w. Tests on paint samples included opacity using a UV-Vis spectrophotometer (EASYSPEC safas Monaco), washability using the Digital BGD 526 Wet Abrasion Scrub Tester, and drying time set using the ASTM STP500 procedure. The results showed that the opacity (hiding power), washability resistance, and set drying touch time met the emulsion paint standards for all binder levels, except the 100% w/w modified NRL composition. The higher level of NRL in the binder causes these properties to decrease and become unstable. The best opacity (hidden power), washing resistance, and drying touch time were obtained on modified NRL with a concentration of 15% w/w. The binder content in the paint was around 4% w/w, with an opacity of about 1.78% abs, washing resistance of 12 times, and the set drying touch time to 80 min.
Kabupaten Kuantan Singingi merupakan daerah produsen komoditi karet alam terbesar di Provinsi Riau. Sejumlah besar gabungan kelompok tani (GAPOKTAN) karet di beberapa desa dan didukung oleh pemerintah daerah sudah membentuk Asosiasi Petani Karet Kuantan Singingi (APKARKUSI), untuk melakukan pengendalian kualitas dan pelelangan bahan olah karet (bokar). Asosiasi ini juga berencana akan mengembangkan industri hilir berbahan baku utama bokar. Tujuan kegiatan ini adalah untuk melakukan persiapan awal terkait dengan rencana pengembangan produk hilir karet tersebut. Kegiatan tahap awal ini meliputi penentuan kualitas bokar dari petani yang berafiliasi dengan APKARKUSI, jenis produk hilir karet tahap awal dan perencanaan tata letak mesin dan sarana produksinya, dan spesifikasi yang diinginkan pasar dari produk sandal karet sebagai salah satu jenis produk hilir karet yang akan dikembangkan. Kualitas bokar yang dikelola oleh APKARKUSI relatif sangat baik (yaitu dengan kadar karet kering berkisar 60-65 %). Jenis produk hilir karet yang siap diproduksi adalah brown crepe rubber, dimana kinerja proses produksinya masih perlu dioptimalkan. Spesifikasi produk sandal karet yang akan diproduksi bersifat dinamis, yaitu dengan mempertimbangkan faktor model, kualitas, kenyamanan dan harga. Untuk proses produksinya, perlu merujuk kepada tata letak mesin dan sarana produksi yang dapat menhasilkan kinerja yang efektif dan efisien.
The COVID-19 pandemic that hit Indonesia had a significant impact on the industrial sector. One of them is the natural rubber industry which has experienced a decline due to export restrictions from natural rubber export destination countries. This has a direct impact on rubber farmers who suffer financial losses. The formation of a new natural rubber downstream industry for natural rubber modified asphalt is a solution to increase national rubber consumption without relying on exports. Therefore, the purpose of carrying out the asphalt title test based on natural rubber type crepe rubber is to evaluate technical feasibility and educate the public about using natural rubber for domestic needs. This service method consists of several stages: observing the absorption potential of natural rubber, analyzing technical feasibility, and evaluating the degree test of natural rubber modified asphalt. The degree test was carried out on the 10-meter road around the Faculty of Engineering, Riau University. The results of the degree test show that the modified asphalt raw material is based on crepe rubber, the asphalt sample marshall test that was held, and the core drill test meets the 2018 Highways standard. The degree test that has been carried out can educate the community and rubber farmers through APKARKUSI regarding natural rubber processing technology and compound making. Crepe rubber and the technology of making modified asphalt and applying modified asphalt for roads.
Polyvinyl acetate (PVAc) has long been known as a binder material to improve the washability, opacity (hiding power), and viscosity of commercial emulsion paints. This study aims to study the properties of opacity (hiding power), washability resistance, and viscosity of emulsion paint added with a binder from a mixture of natural rubber latex (NRL) and PVAc. Emulsion paint samples were made with a binder content of 4, 6, and 8% w/w. The binder was made from a mixture of NRL and PVAc with various NRL levels of 0%, 15%, 25%, 35%, 50%, and 100% w/w. Testing of paint samples includes washability using a digital BGD 526 Wet Abrasion Scrub Tester and viscosity testing using a HAAKE 6R digital viscometer. At the same time, the opacity test uses the Indonesian Standard (SNI 3564:2009). The results showed that the opacity met the standard emulsion paint for all binder levels, except for the composition of NRL 100% w/w at all binder levels. The higher the NRL content in the binder causes the washability resistance and paint viscosity to decrease and become unstable. The best washability resistance and viscosity properties were obtained at NRL in a binder of 15% w/w and a binder content of 8% w/w, with washability resistance properties of 50 times and a viscosity of 3300 cp.
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