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Schill+Seilacher “Struktol” introduces new processing additive for diamine crosslinking polymers

Schill+Seilacher “Struktol” GmbH has introduced Struktol HT 750, a new processing additive for diamine crosslinking polymers. AEM, ACM and HNBR can be challenging to work with, as the high additive loadings necessary for processing often compromise some of the rubber’s physical properties.

YR8A4714Struktol HT 750 was designed to overcome these negative effects, while also achieving excellent processing in both white and black filled compounds.

Diamine crosslinking polymers are common in the automotive applications and need to perform in a very demanding environment. In this setting the compression set, the permanent deformation in a material after an applied force is removed, is one the most critical physical attributes measured. When processing with silica filler, amino-silanes are typically added to improve compression set, but negatively impact tensile strength and elongation at break. In stark contrast to the status quo, Struktol HT 750 interacts with the silica surface and improves dispersion and compression set without sacrificing elongation at break and tensile strength.

“ Struktol HT 750 is also unique in that it allows a compounder to reduce or replace other expensive processing additives such as amino-silanes, alkyl phosphate, and stearic acid in white filled compounds. A head-to-head comparison in HNBR showed that replacing amino-silanes with Struktol HT 750 had a negligible effect on compression set, but a substantial and significant improvement in elongation at break and tensile strength. Even without alkyl phosphate, the improvement remained,” said the company.

Additional testing in both AEM and ACM have produced similarly impressive results. Dr. Volker Boerger, one of Struktol HT 750’s developers, remarked, “I was excited to see that in AEM with silica-carbon black filler, the absolute best compression set performance was recorded in a compound without amino-silane, alkyl phosphate, and a reduced stearic acid dose.”

The first in a new series, Schill+Seilacher “Struktol” GmbH anticipates future modifications to Struktol HT 750’s activity level, so to be able to tailor performance to individual customer specifications. In strategic terms, the Global Director of Sales and Marketing Holger Gefeller said, “We see a demand for new and sophisticated additives that can bring out the full potential of newly developed rubber grades and polymers. This is the type of innovation that will dictate the future of the rubber business.”

 

 

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