ADDITIVES | PVC
Figure 4: Performance of Lanxess’s new phthalate-free Bonding Agent 3001, measured by peel test, compared with its established 51030 grade in a PVC paste formulation at addition levels from 0-20%
Source: Lanxess
two years in the pandemic and war, is that the scarcity of strategic raw materials can impact deeply on the economy of the countries,” Sarti says. “For all these reasons ATO-free alternatives must be available, competitive in costs and performance. In that context, one of the new R&D fields at Reagens is in flame retardants replacing ATO in a wide range of articles.” These alternatives, which function in the conden-
sate phase and promote crosslinking of PVC during fire conditions, also act as potent smoke suppres- sants (Figure 2). This means they can be used for production of articles with extremely low smoke emission. Reagens has introduced its NT 800X FR series for use with unplasticised and plasticised PVC — particularly cables, hoses, conveyor belts, roofing membranes, and uPVC panels — and is developing tailor made solutions based on specific customer needs. “Another pretty interesting resin is chlorinated
Right: Bouncy castles made from PVC- coated textiles can benefit from improved bonding agents from Lanxess
PVC [PVC-C], used for niche articles where some specific characteristics are required — heat and chemical resistance, flame retardancy, low smoke emission,” Sarti adds. Reagens produces boosters for tin stabilisers and COS (solid calcium organic system) stabilisers for a wide range of PVC-C articles, including pipes and fittings, and sprinklers, These are marketed as Reapak B-NT/7222 and Reapak TU/1900 respectively (Figure 3).
Improved coatings PVC is a near ideal material for coating of textiles such as PA and polyester. To achieve the best results the PVC pastes used for this application typically require the use of bonding agents, which frequently include aromatic polyisocyanurates introduced as an active ingredient in a liquid carrier such as plasticiser. Lanxess Head of Lab Applica- tion Technology, Leverkusen Polymer Additives, Dr
54 COMPOUNDING WORLD | June 2022
www.compoundingworld.com
Thomas Augustin says bonding agents greatly increase the adhesion of the PVC layer to the textile fibres but reports a growing trend and demand to use smaller amounts. The company has developed a new bonding
agent grade that targets this new market demand. “With Bonding Agent 3001, Lanxess offers the next generation of bonding agents that meet latest needs,” says Augustin. The high performance product is phthalate-free — it is based on the company’s Adimoll BO plasticiser, which is an adipinic acid benzyl octyl ester (BOA). Performance of Bonding Agent 3001, measured in terms of tear strength, is said to be superior to that of a phthalate-containing bonding agent such as BA 51030 over the usual addition range of 2-8%, Augustin says (Figure 4). He advises, however, that formulators take into account the fact that the use of more than 10% of a bonding agent will result in reduced adhesion. Cost effective, non-toxic and heavy metal-free is
how Valtris Specialty Chemicals describes its latest line of stabilisers for PVC. “These stabilisers are designed to meet the ever-changing regulatory
IMAGE: LANXESS
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