Sponsored By

With three new additives, German supplier has enhanced the properties of anionically polymerized AP­Nylon cast polyamides.

Stephen Moore

December 2, 2016

3 Min Read
New additives enhance performance of cast polyamides

A new  heat stabilizer, Bruggolen TP­C1608 developed by BrüggemannChemical, for the first time enables long-term service temperatures of up to 150°C for cast polyamide compounds. The company has also developed Bruggolen TP­C1312 to raise impact strength.

Further, the delaying activator Bruggolen C25 can be used to not only facilitate the casting of parts with large dimensions and/or small wall thicknesses but also to simplify the production of high-quality composites.

With the development of these stabilizers, BrüggemannChemical is supporting the automotive driven trend towards lightweight construction and extending it to other industrial applications which are exposed to high temperature conditions. Cast polyamide can thus replace heavy metal parts and even entire subassemblies all of which benefit from its inherent excellent damping properties and high corrosion resistance and which now can also be subjected to increased temperatures.

Bruggolen C25 is a delaying activator for polymerization in the cast polyamide process. This is a particular advantage with parts of large dimensions, ones with small wall thicknesses, and those with complex geometries.

Furthermore, AP­Nylon heat stabilized with Bruggolen TP­C1608 also extends the possible applications for prototype moldings. One example is a complete automotive intake manifold produced via an inexpensive silicone mold which was evaluated prior to commercial production.

Bruggolen TP­H1606 is another heat stabilizer recently launched by BrüggemannChemical based on similar technology. It has been developed for the modification of polyamide 6 and polyamide 66 compounds for injection molding and extrusion applications.

In cases where the basic toughness of AP­Nylon and the very high impact strength of Nyrim polyamide 6 block copolymers exceed requirements, the new Bruggolen TP­C1312 impact modifier from BrüggemannChemical provides the ideal solution. By varying the dosage of the additive and thus the elastomer content (between 3% and 20%), it makes it possible to accurately adjust the impact strength to the demands of the application. In this way, polymers modified with Bruggolen TP­C1312 bridge the gap, in terms of cost and performance, between unmodified cast polyamides and highly impact resistant Nyrim.

Modification with Bruggolen TP­C1312 also reduces the hardness of molded parts to between 80 and 60 Shore D, so that, for example, rollers can run more softly and thus more quietly. With semi­finished products, any tendency to fracture is reduced during machining. All applications benefit from virtually streak free moldings because of the very homogeneous dispersion of the elastomer phase in the AP­Nylon matrix.

Bruggolen C25 is a new delaying activator for AP­Nylon. It slows down the polymerization process compared to the standard grade, Bruggolen C20P. Whereas the open time (transition from liquid to solid phase) of the standard is between 1 and 5 min, times of 2 to 10 min can be attained with Bruggolen C25. This is a particular advantage with parts of large dimensions, ones with small wall thicknesses, and those with complex geometries, as, together with more time for the equipment operators, it allows initially entrapped bubbles enough time to rise completely to the surface. Above all, Bruggolen C25 also makes the manufacture of high-grade, two-dimensional, glass or fabric reinforced composites easier. At the product development phase, it also permits parts to be filled more slowly so as to be able to study and optimize the processes.

As far as processing is concerned, the additive does not require any change to the temperatures of the polymer and mold. The mechanical properties of the resulting polymers are similar, although Bruggolen C25 is characterized by a slightly yellowish color.

About the Author(s)

Stephen Moore

Stephen has been with PlasticsToday and its preceding publications Modern Plastics and Injection Molding since 1992, throughout this time based in the Asia Pacific region, including stints in Japan, Australia, and his current location Singapore. His current beat focuses on automotive. Stephen is an avid folding bicycle rider, often taking his bike on overseas business trips, and is a proud dachshund owner.

Sign up for the PlasticsToday NewsFeed newsletter.

You May Also Like