Release Agents 

Rhein Chemie - Release Agents

Release agents are required in the processing of crude rubber to produce vulcanizates because if rubber compounds stick together and to the mold, a smooth, automated process becomes impossible. Rhein Chemie offers rubber processors targeted solutions with its Rhenodiv® brand.

The Rhenodiv® portfolio is primarily aimed at tire manufacturers. Rhein Chemie offers a wide range of products, including environmentally compatible aqueous inside and outside tire paints, bladder coatings and mold release agents. These are complemented by compound release agents in powder and liquid form for all rubber compounds used in tires.

Inside tire paints
Rhenodiv® inside tire paints ensure that the bladder slides smoothly into the unvulcanized tire during molding vulcanization. This avoids the partial undervulcanization that can occur as a result of entrapped air and helps release the tire from the surface of the bladder at the end of the process. Rhenodiv® 9094-1 and Rhenodiv® 9092 G are tried-and-tested inside tire paints from this product group. Probably the most demanding car tires at present in terms of geometry are sidewall-reinforced tires with self-supporting properties. Rhein Chemie is ideally equipped for the future with Rhenodiv® 5100-2, an inside tire paint developed specifically for this application.

Tire bladder coatings
Rhenodiv® bladder coatings represent an efficient alternative to inside tire paints. The semi-permanent aqueous products Rhenodiv® 700/2 and Rhenodiv® 710 are applied to the surface of the bladder and, with regular recoating, are able to replace the paints. The semi-permanent transfer inside tire paint Rhenodiv® 9700 is directly related to this product group but bladder recoating in this case is performed indirectly through transfer from the inside of the tire every fifth to tenth tire blank. Depending on the process used, Rhenodiv® bladder coatings improve the durability of bladders up to a service life of 800 cycles. The tried-and-tested Rhenodiv® D 638-1 system containing solvent sets standards in terms of durability in this product group.

Outside tire paints
The complex profiles of car and truck tires can only be created using a large number of correctly positioned venting valves in the vulcanizing molds. Skilled engineering generally makes it possible to avoid the use of flow and venting aids. For difficult tires, Rhein Chemie offers the effective aqueous outside tire paints Rhenodiv® 9140 and Rhenodiv® 9208, which significantly cut scrap rates. The increasingly automated handling of tires during the manufacturing process and an ever growing number of different tires are essentially made possible by a color coding system. Traditionally dark outside tire paints can cause confusion because they partially mask this coding. Transparent outside paints, on the other hand, often result in visual defects on the tire surface. The new transparent outside paint Rhenodiv® 9160 was specifically developed for application using automated tire blank spraying systems and leads to tires with no visual defects.

Mold release agents
Traditional mold release agents are used in tire vulcanization, just as in all other molding vulcanization processes. Free silicone oils are inconceivable in this process because they get in between the various tire components and lead to layer adhesion defects that, depending on the use of the tire, can put lives at risk. The semi-permanent mold release agent Rhenodiv® 60 crosslinks on the surface of the vulcanization mold to create a resilient, durable silicone polymer film that demonstrates excellent release and lubrication properties and in no way compromises layer adhesion.

Compound release agents
Compound release agents for batch-off systems represent one of Rhein Chemie’s core skills. The powder release agents combine good wetting and a low tendency to foam with outstanding release properties. Powder release agent technology is far superior to soaps in these respects. The newly developed powder release agents Rhenodiv® S 501-2 and Rhenodiv® S 505-2 also work well with particularly sticky compounds such as masticated natural rubber or halobutyl.

Hose release agents
Rubber processors outside the tire market can also have confidence in Rhein Chemie’s release agent portfolio. For example, manufacturers of elbow hoses can use environmentally compatible Rhenodiv® lubricants to push hose blanks onto bent metal mandrels and remove them again with ease after the following vulcanization. While Rhenodiv® H 801 was developed for hoses made from special-purpose rubbers such as epichlorohydrin rubber (ECO), Rhenodiv® H 850 enables smooth vulcanization of ethylene-propylene-diene rubber (EPDM) elbow hoses.

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