“As a backward integrated manufacturer of specialty chemicals for our polymer- and silica-bound rubber additives with more than 125 years of experience in the rubber industry, we not only offer our customers products of consistently high quality, but can also take responsibility for their availability,” says Dr. Benjamin Bechem, Head of Global Marketing Technical Rubber Goods at the LANXESS Rhein Chemie (RCH) business unit.
Rhenogran - a benchmark for pre-dispersed rubber chemicals and additivesThe products of the Rhenogran family improve handling and processability of rubber chemicals and enhance the quality of finished articles. Especially shorter mixing times in combination with lower processing temperatures are economic reasons.
A real multitalent is Rhenogran CLD-80. Unlike ordinary sulfur, Rhenogran CLD-80 ensures an extremely stable vulcanization network by forming mainly mono- and disulfidic bridges. This results in an excellent heat aging resistance of the vulcanisates and prevents premature reversion. Unlike thiurams or morpholine, Rhenogran CLD-80 does not generate carcinogenic N-nitrosamines during vulcanization, nor do the vulcanisates show any blooming. Therefore, the product is particularly preferred for rubber parts that are exposed to extreme conditions such as high operating temperatures combined with high loads, e.g. high-performance tires, seals or anti-vibration elements.
Rhenogran Geniplex-70, used for the sulfur curing of EPDM and other diene rubbers that also reduces the decomposition temperature of blowing agents, has an activating effect on vulcanization. Processing safety of rubber compounds containing Rhenogran Geniplex-70 is increased, and curing improved. Thiurams and carbamates forming carcinogenic N-nitrosamines can be replaced by Rhenogran Geniplex-70 without any negative effects in terms of processing safety or mechanical properties.
Rhenogran TP-50 is a proven crosslinking additive for the N-nitrosamine-free curing of rubber compositions. In combination with sulfur and primary accelerators, Rhenogran TP-50 sets standards in realizing economies of scale in rubber compounds while keeping reject rates low. In particular, the considerably high solubility up to six parts per hundred rubber (phr) provides flexibility in a wide range of formulations. Besides N-nitrosamine free curing which is nowadays mandatory in state-of-the-art automobiles this chemical also provides versatile solutions to various problems from improving reversion resistance to coping with dispersibility and efficiency problems owing to its solubility in different rubber types.
Rhenogran HMDC-70/AEMD, a diamine based cross-linking agent, is a state-of-the-art curative for oil-resistant seals and hoses based on AEM, and selected polyacrylic rubber types (ACM) for use in vehicles and engineering. Rhenogran HMDC-70/AEMD combined with Rhenogran XLA-60 is the crosslinking system of choice when having to deal with high temperature resistant AEM or other diamine crosslinkable elastomers. Not only is this a safe crosslinking system, free of guanidines or other dangerous amines, the physical properties it impairs are better or at least on par with the conventional unsafe systems.