Flame Retardants, Anti-hydrolysis Additives and Prepolymers for CASE Applications
2018-05-16    [Source:Gupta Verlag]

Lanxess will be showcasing its products for the polyurethane industry at Utech Europe 2018. The Urethane Systems business unit will highlight its broad portfolio of prepolymers with very low free isocyanate content for cast elastomers.

Adiprene LF prepolymers are based on TDI, MDI, HDI, IPDI, and pPDI diisocyanates, with free monomer content usually below 0.1 %. In particular, Adiprene LF MDI prepolymers, together with the aromatic diol curing agent Vibracure 2101, are an alternative to TDI and LF TDI prepolymers cured with MbOCA (4.4'-Methylene-bis(2-chloroaniline)). The use of MbOCA within EEA countries has recently been severely restricted and regulated by the European chemicals regulation REACH. “Our urethane systems meet all REACH requirements, and produce elastomers with high elasticity and improved resistance to abrasion, impact, and hydrolysis, while using the same processing equipment. In addition, they are easier to process because of their lower viscosity,” explained Dr. Markus Eckert, Head of Urethane Systems at Lanxess. The pot life can be long to help with moulding large parts, and can be catalysed for higher productivity.

In addition, new Adiprene K blocked prepolymers are available with curing agents to make customer-specific, fully-formulated reactive systems. Curing of these prepolymers is triggered at a precisely defined temperature resulting in a controlled cure. “With these systems, we are targeting large and complex parts and manual processing, which is used for very low volume production,” said Eckert. These prepolymers have inherently good industrial hygiene, as there is no free isocyanate due to the blocking. Potential applications include the impregnation of fabric belts, abrasive pad binders or the coating of industrial rollers. The systems are also suitable for rotational moulding and liquid injection moulding.

New flame retardants and hydrolysis stabilisers

As a manufacturer of bromine and phosphorus based flame retardants, Lanxess’ Additives business unit offers solutions for all types of polyurethanes. The products presented at the trade show include flame retardants, plasticisers, crosslinkers, catalysts, and hydrolysis stabilisers. The focus is on new flame retardant solutions from the Levagard, Disflamoll and Reofos product ranges, which have proven themselves, e.g., in rigid and flexible foam applications based on polyurethane as well as in coatings, adhesives and sealants. They combine plasticising with flame retardant properties. “Our new oligomeric flame retardant solutions can help address the increasing requirements for flexible foams and meet our customers’ demands for low fogging and low emission additives,” explained Dr. Heiko Tebbe, Manager Application Technology Polymer Additives at the Lanxess Additives business unit.

The company will also introduce Stabaxol L, the first product in a new range of low-emission hydrolysis stabilisers. It is particularly suitable for polyester/polylactone polyols, thermoplastic polyurethanes and other PU elastomers. The product is liquid and of low-viscosity at room temperature, therefore it is easy to dose and process without prior heating.

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