ADDITIVES | ANTIOXIDANTS AND STABILISERS
Right: These recycled HDPE UV-protectors for pineapple cultivation use BASFs IrgaCycle additives
an excellent choice for TPO roofing for UV resist- ance,” it claims.
Recycling ideas Last year, BASF launched IrgaCycle, a range of additive solutions designed for use by compound- ers, as well as recyclers and converters, to improve the properties of mechanically recycled plastics. The range includes additive packages that the company claims can help increase recycled content levels (PCR and PIR) in applications such as packaging, automotive and mobility, and building and construction. They address common issues such as limited processability, poor long-term thermal stability, and insufficient protection from weathering. One of these packages, IrgaCycle UV 033 DD, combines weathering resistance with enhanced thermal and processing stability for reclaimed HDPE and PP blends used in outdoor goods. It is now being used by 3T Industries, a leading recycling company in Malaysia, to enhance properties of 100% recycled HDPE sheet used to manufacture protectors for farmed pineapples. According to BASF, pineapples are susceptible to damage from solar radiation and temperatures exceeding 32°C. The HDPE protector is designed to shield the fruit from direct sunlight while still allowing photosynthesis to occur. Previously, 3T Industries used a combination of individual antioxidants and light stabilisers to achieve the performance requirements stipulated by the grower (primarily that the HDPE protectors
would provide a service lifetime of four growing seasons). IrgaCycle is a one-pack solution that is immediately available for the recycler with no need for further premixing. It is also said to be more efficient at lower concentrations compared to traditional antioxidant systems. “With IrgaCycle, we were able to use recycled feedstock to design a new product that features a high amount of recyclate content and makes more sustainable agricultural plastics possible,” accord- ing to PH Tan, Managing Director of 3T Industries. Earlier this year, BASF also announced an
expansion of capacity for production of its HALS light stabilisers at its plants in Germany and Italy. The company has not disclosed the scale of the multi-phase project, which it says is a response to growing demand, but says the new capacities will come on line over the next 1-3 years. Upcycling or recycled resins is also proving to be an opportunity for Byk. Jörg Garlinksy, the company’s Head of Global End Use Thermoplastics - Industrial Applications, products such as its RecycloByk 4372 additive improves the recycling of HDPE into applications such as pallets and bottle crates for outdoor use through “targeted restabili- sation of the polymer matrix.” The company also offers RecycloByk 4371, which is said to be helpful in restabilising PP and other polyolefin compounds that are exposed to particularly aggressive substances. Other Byk products, such as some of its Byk-Max and Scona grades, also support the use of recyclates. Chinese additives company Rianlon continues
Figure 3: Gloss retention over exposure of plastomer/PP-based formulations containing ADK Stab LA-704AF against a conventional triazine HALS stabiliser. All formulations contained Ti02 and MDH flame retardant; HALS content 0.75% (ISO4982-2) Source: Adeka
70 COMPOUNDING WORLD | September 2022
to expand its range of antioxidants and light stabilisers for thermoplastics through the develop- ment of new blends to enhance performance in specific applications, which it offers in its U-Pack line. “For recycling, not only established products are needed,” the company says. “The applications
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IMAGE: BASF
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