Executive summary
Improving the mechanical properties and heat resistance of existing classes of rubber materials is a constant challenge to meet the increasing demands of modern engineering applications. HNBR is a high-performance elastomer that was developed to meet such increasingly stringent demands. Introducing a carboxylic acid group
attached to the backbone of HNBR to form HXNBR is expected to further improve HNBR’s superior mechanical strength, adhesion properties and abrasion resistance.
The recent commercial development of an HXNBR (hydrogenated carboxylated nitrile rubber)—Therban XT—offers a viable route to products with these improved performance properties. The vulcanization of Therban XT (HXNBR) compounds can be achieved via sulfur accelerator systems, peroxide systems, ionic mechanisms and other chemical reactions.
In addition to expected improvements in mechanical properties, Therban XT-based compounds also exhibit unusually high tear strength at high temperatures when compared with regular HNBR and other synthetic elastomers. Furthermore, our investigations also show that excellent adhesion properties can be obtained over a
broad range of temperatures, especially in the higher temperature range.
This paper discusses the improvement in different aspects of performance that can be obtained by using Therban XT either alone or in combination with regular Therban/HNBR. The unique interaction between HXNBR and metal acrylates in the presence of regular HNBR and peroxide curatives and its potential application also are explored.
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Nguồn: Quốc Anh, Cao su Đức Minh
Trích từ: Diễn đàn cao su www.cao.org
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