New alternative to lead stabilisation for PVC pipes
Authors: Hebrard, M.; Lundquist, E. G.; Cho, J.-Y.
Source: Plastics, Rubber and Composites, Volume 37, Numbers 9-10, December 2008 , pp. 425-430(6)
Publisher: Maney Publishing
Abstract:Environmental concerns will lead to the elimination of lead based heat stabilisers over the next 5 years, forcing pipe producers to re-evaluate their formulations as they strive to remain cost competitive. A new stabilisation system is described based on a derivative of the mercaptan chemistry that is well established for conventional tin stabilisers. The patented technology includes organic based, heavy metal free compositions that contain blocked thiols, which under vinyl processing conditions generate active stabilising components. These innovative systems are shown to offer wide processing windows, to give excellent early colour and to meet the technical requirements of the pipe market. An additional benefit is reduced cross-linking to facilitate recycling. Results concerning the stabilisation mechanism and performance attributes (stabilisation, rheology and recycling data) of the new stabiliser on both laboratory and industrial equipment are presented.
Document Type: Research Article
Publication date: 2008-12-01
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