Than
đen là một thành phần gia cường quan trọng trong các hỗn hợp cao su. Than đen
được phân thành nhiều loại khác nhau phụ thuộc vào tính năng gia cường của than
đen (như mức kháng mài mòn), phương pháp sản xuất và diện tích bề mặt than đen,
phù hợp cho các ứng dụng riêng biệt. Phần tài liệu bên dưới sẽ trình bày cụ thể
về vấn đề này.
…
Carbon black is classified in several ways. One way is to
classify carbon black in accordance to their levels of abrasion resistance; super
abrasion furnace (SAF), intermediate super abrasion furnace (ISAF), and high
abrasion furnace (HAF). Extrusion rate is another way to classify carbon black,
where fast extrusion furnace (FEF) and general-purpose furnace (GPF) are in
that category. There are other classifications, but basically they all depend
on their manufacturing process, structure and surface area. The American
Society of Testing Material (ASTM) designated ASTM numbers for rubber grade
carbon blacks. Typical grades are summarised in Table 5.3 according to ASTM
D1765. The N series comprises normal curing furnace and thermal blacks. The S
series is slow curing channel blacks and oxidised furnace blacks. The first
digit of the three digit number, following the alphabet character, represents
the particle size range, which increases as the number becomes higher. With
respect to tyre applications, fine particle blacks in the 100 range to 200
range, SAF and ISAF, respectively, are mainly used in truck tyre tread stocks
to maximise tread wear resistance. Passenger tyre treads primarily use blacks
in the 300 range, which represents the HAF family, typically N339 or N343.
Medium to coarse blacks such as N550 (FEF) are used in body skim stocks for
better processability, and low structure black such as N326 is used in steel
skim stocks to provide a fatigue resistant compound. Innerliner butyl rubber
stocks may use N660 black (GPF) at high loading in order to achieve good
impermeability with easy processing. A recent report [10] indicated that semi-reinforcing
furnace black (SRF) would further improve innerliner impermeability.
…
Trích
đăng từ sách Rubber Technologist’s
Handbook, Sadhan K. De và Jim R.
White, Smithers Rapra Technology, trang 141
Nguồn:
www.books.google.com.vn
(vtp-vlab-caosuviet)
