Lanxess presents new solutions for the rubber processing industry

Due to the high toxicity of ETU-based curing systems, the combination of Rhenogran MTT-80 with Rhenogran HPCA-50 may be used for the safe cure of chloroprene rubber parts. Whether mercaptan or xanthogen disulfide modified CR types – all can be safely crosslinked with MTT-80 and HPCA-50 while reducing magnesium oxide concentration and improving aging resistance.

Highly effective accelerators

Whatever the task is, e.g. N-nitrosamine-free curing systems, formulations for reversion-stable networks, high solubility in rubber, fast curing rates or replacement of otherwise eco-critical chemicals – dithiophosphates from RCH are the handy solution for every compounder.

Rhenocure SDT/S, a dithiophosphate-based sulfur donor, is a co-accelerator for various challenges in rubber compounding, e.g. an accelerator for N-nitrosamine-free EV curing systems, an anti-reversion agent for heat-resistant vulcanisates, or for the partial replacement of standard accelerators.

Functional additives

The brand Rhenofit stands for a wide assortment of functional additives including antioxidants, filler and blowing agent activators, cross-linking activators and desiccants. Depending on the respective raw material and its handling requirements, these products are available either in powder, pellet, liquid or dry liquid form. If not specified otherwise, liquid additives are offered as dry liquids on inert, inorganic white filler material as a free-flowing white powder for easy handling and mixing. For peroxide vulcanization crosslinking coagents are available, e.g. Rhenofit TAC/S.

Rhenofit STA/S, a combination of activating polar substances, acts as a curing activator and processing promoter for silica and other white fillers. Rhenofit STA/S helps to properly disperse polar compound ingredients and simultaneously activates silica and other white reinforcing fillers. The vulcanization is accelerated and cure efficiency is improved to an extent that Rhenofit STA/S may be used as a secondary accelerator.

Antioxidants and antiozonants from LANXESS make rubber articles last longer

One focus of LANXESS’s presence at the DKT will be on antioxidants, since rubber, a truly versatile material, must be individually protected against aging based on its respective use. The Advanced Industrial Intermediates (AII) business unit offers the rubber industry an extensive range of coloring and non-coloring antioxidants and antiozonants that can be dosed and processed easily, safely, and with minimal dust. Most importantly, they can be combined to further improve each additive’s individual range of effects.

Each antioxidant and antiozonant has a typical range of efficacy with regard to the different types of aging. Depending on their chemical structure, they counteract one or more of the aging processes. With its Vulkanox, Vulkacit, Vulkazon and Renacit brands, LANXESS is one of the few manufacturers worldwide to offer the right additive for all steps of the rubber production process from a single source.

Preventing material deterioration

Aging processes, which are mainly triggered by the effects of oxygen, ozone, and heat, change the properties of vulcanized rubber and can lead to its partial or complete deterioration over time. The Vulkanox brand of antioxidants and the Vulkazon range of antiozonants from LANXESS significantly extend the useful life of elastomers. This means that truck tires, technical rubber goods, and fire hoses, for example, can remain in use longer and retain their properties.

For natural rubber, AII has developed the highly effective wax pellets Renacit 11/WG. The masticating agent breaks the molecular chains and makes the material easier to process.

In addition to antioxidants, the company offers Vulkacit vulcanization accelerators. Sulfenamides are by far the most widely-used accelerators in the rubber industry. They have an effect on both the speed of the cross-linking reaction and the properties of the vulcanized products.

Source: Lanxess