materials feature | PVC Formulation
substances. The company says that it has been tailored specifically to the needs of the PVC industry. The company has also developed a tri-blend, X-20,
which offered good handling characteristics and solvation performance. It also had lower than expected viscosity, which could lead to easier formulation of plas- tisols with a high solvator type plasticiser. A third grade, X-100, is a new glycol dibenzoate. In
tests carried out by the company, it offered high solvation for vinyl, but was less efficient than the other dibenzoates tested. However, its high modulus was an advantage in some applications, said the company. One of the company’s aims in developing the new
grades was to lower their freeze points: DEGDB, though commonly used in blends, has a freeze point of 28˚C, which is above normal room temperature. The freeze points of the three experimental blends
Clariant showed details of its Licocare sustainable lubricant at the recent PlastIndia
The nanofillers being developed can increase the
thermal stability of the material, reduce smoke emission in the case of combustion, and halt the deterioration of mechanical properties caused by other fire retardants. “Thanks to the synergy between the nanofilling and the flame retardant material, it is even possible to reduce the proportion of conventional flame retardant materials used in standard formulations,” he added. Finally, improving the permeation properties of the
materials can lead to the development of new formula- tions with barrier properties against gases and volatile organic molecules with low molecular weight. This way, the diffusion of gases through the modified polymers can be reduced. The Vinilclay project receives funding from the Spanish Ministry of Science and Innovation within the framework of the Innpacto programme, and is co-fund- ed by the European Regional Development Fund. It is due to finish at the end of this year.
Dibenzoate blends US-based Emerald Kalama has recently developed a series of dibenzoate plasticisers for PVC, which can be used as alternatives to traditional materials such as phthalates, especially DOP and DINP. The range comprises two dibenzoate blends and one
new grade of a glycol dibenzoate. “There is a need for phthalate alternatives, but many
do not always give the performance desired in vinyl compositions,” said William Arendt, research fellow at the company. Historically, two dibenzoate esters (DEGDB and DPGDB) have commonly been used has phthalate alternatives. One of the new compounds from Emerald Kalama, called X-250, is a new blend of these two
28 PIPE & PROFILE EXTRUSION | May/June 2012
were: 6˚C for X-20; 12˚C for X-250 – an identical temperature to commercially competitive dibenzoate blends; and X-100 formed a glass. “Overall, dibenzoates are excellent choices as non-phthalate high solvators,” said Arendt. “They are very useful in blends with other plasticisers to tailor to application requirements.” The company has recently announced plans to
increase its output of non-phthalate plasticisers. It has begun construction of a 60% expansion in the produc- tion of its K-Flex plasticiser at its plant in Kalama, USA. The extra reactor capacity is scheduled to be commis- sioned in January 2013. This is the second plant expansion here in two years, says the company. At the same time, it is building a new plant in the Netherlands, to produce K-Flex. The plant, in Rotter- dam, will be commissioned later this year. The site was acquired when Emerald bought the special products division of DSM in late 2010.
Soybean lubricant Renewably sourced additives are becoming increasingly common in PVC additives. Clariant recently introduced a lubricant for PVC extrusion, derived from soybean oil. Licocare SBW11 TP is a chemically modified wax that
claims to offer high performance, as well as efficiency and sustainability benefits. It claims superior perform- ance compared to the fatty acid derivatives that are traditionally used for lubrication. Clariant says it is particularly suitable for the
processing of rigid PVC compounds, especially PV film and extrusion applications that are stabilised by calcium/zinc or tin. It acts as an external and internal lubricant, and offers a number of performance benefits, including: good release/anti-sticking effects; no mould deposits, thanks to low volatility and good compatibility
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