AP-Nylon® Caprolactam - the Ideal Basis for Cast Polyamides

Cast polyamide, made by anionic polymerization of AP-Nylon® Caprolactam, combines outstanding material properties – e.g., high impact strength, abrasion resistance and vibration damping – with exceptionally low inherent stresses in the product. Polymerization occurs without applied pressure at temperatures around 120 to 150° C. Cast polyamide products, whether in the form of semi-finished stock or complex castings, can be made very cost-efficiently by all known casting processes, i.e., vertical casting, centrifugal casting or rotational-casting.

Following mixing of the two components – molten pre-blends of Caprolactam/Activator and Caprolactam/Catalyst – and filling of the mold, the polymerization reaction takes only a few minutes to complete. The resulting low-stress castings of semi-crystalline PA6 are of high dimensional accuracy and exhibit no sink marks, even on parts with major thickness differences. Thus, tailor-made materials and process expertise from Brüggemann create the prerequisites for delivering uniformly high standards of product quality.

Process technology for Nylon Casting:

AP-Nylon® Caprolactam is a preferred raw material for producing cast polyamide (PA6) by Anionic Polymerization with the aid of special Activators and Catalysts (BRUGGOLEN® C additives)

The AP-Nylon® Caprolactam supplied by Brüggemann has lower moisture content than standard Caprolactam. For Anionic Polymerization, the starting materials must be as anhydrous as possible and any ingress of moisture needs to be prevented as it would interfere with the polymerization process. Moreover, Caprolactam flakes get increasingly susceptible to agglomeration with rising moisture levels.

In order to prevent water absorption and agglomeration during shipping and storage, AP-Nylon® Caprolactam is stored and shipped in liquid form under dry nitrogen; the solid product is supplied in aluminum-lined bags.

AP-Nylon processing advantages

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