PVC | ADDITIVES
Seeking stability in PVC
Developments in PVC stabilisers are targeting new market demands and potential regulatory changes. Peter Mapleston finds out more
Stabilisers are key to the successful use of PVC in both flexible and rigid applications so, perhaps unsurprisingly, it is an area that has seen ongoing development activity in recent times. Some of these developments target changing market trends, others safety issues and possible impend- ing legislation, and still more simply provide improved overall performance. In an effort to strengthen security of supply and
address issues associated with limited availability of butyltin intermediates, Galata Chemicals has developed two new, high efficiency methyltin stabilisers. The company explains that over the past couple of years the industry has seen tight supply of tetrabutyltin (TBT), which is a major intermediate used for manufacturing butyltin heat stabilisers for PVC in EMEA and North America. At the same time, exports of TBT from Asia have also been limited. Taken together, this has created an uncertain outlook for TBT in the near future, Galata says. The company’s recently introduced Mark 3205 and Mark 3270F grades are intended for use in rigid profile, siding, fencing and pipe compounds.
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They are said to impart comparable-to-superior heat stabilising efficiency compared to conventional butyltin stabilisers when used at the same loadings. Mark 3205 is said to exhibit good anti-chatter performance, which is important in high-speed extrusion applications, while Mark 3270F is de- signed to be particularly effective in outdoor applications requiring good weathering and extended long-term heat stability characteristics. “It is expected that the incorporation of these stabilis- ers into rigid PVC compounds would also enable customers to lower cost-in-use of their formulations compared to the butyltins,” says Galata Chemicals Vice President of Technology, Peter Frenkel. Galata Chemicals has also introduced Mark BZ
921, a high efficiency, phenol-free, alkylphenol-free liquid barium-zinc-containing stabiliser that has been formulated for use in general purpose plasticised PVC compounds. Compared to conventional stabilisers of this type, the company says Mark BZ 921 delivers better initial colour, static and dynamic heat stability as well as good oven- aging performance characteristics.
Main image: New stabiliser systems promise to improve processing and durability of PVC while addressing cost and supply issues
� June 2022 | COMPOUNDING WORLD 51
IMAGE: SHUTTERSTOCK
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