ODOUR AND EMISSIONS | TECHNOLOGY I
Right: Microban’s antimicrobial additives can help tackle odour in
plastics caused by microbial action
according to Microban International. As a leading player in antimicro-
bial product protection technolo- gies, Microban says it has invested a great deal of time and effort to address this need. The company has considerable expertise in incorporating antimicrobial additives into recycled plastic products to help reduce microbial growth and eliminate odours. It also claims considerable knowledge of global regulatory require- ments — it says all of its antimicrobial solutions are registered with the Environmental Protection Agency (EPA) in the US or notified with the Biocidal Products Regulation (BPR) in Europe. Recently, Microban partnered with GE Appli- ances to develop its UltraFresh System dishwasher and line of front-loading washers with antimicrobial technology. Antimicrobial additives were incorpo- rated into the formulation of various plastic-based components known to be vulnerable to microbial growth, including high touchpoint handles and control panels, as well as gaskets, pumps and filtration systems.
Sensory panel test results showing malodour reduction in recycled PE film using Evonik’s Tego Sorb PY 88 odour absorbing additive
Source: Evonik
VDA-Norm 278 odour reduction results for
methanethiol and hydrogen sulphide in recycled PA 6 compounds with and without Evonik’s Tego Sorb PY 88 additive
“Having the capability to incorporate the same technology into various formulations, without impacting the plastic properties, is an important step forward for the future of the compounding and additives industries, and a promising prospect for bringing odour control and antimicrobial technologies into the fight for sustainability,” says Microban. The Tego Sorb series of odour
absorbing additives from Evonik are designed to address odours from degradation
products and contaminants in recycled plastics. Tego Sorb PY 88 was the first in the series, de- signed for incorporation via compounding and/or masterbatch processing. It is said to be especially suitable for polyolefins, as well as rubber com- pounds. More recently, the company has intro- duced masterbatches based on Tego Sorb PY 88 with PE and PP carrier resins.
Source: Evonik 60 COMPOUNDING WORLD | March 2022
Locking out odour Evonik says the additives are based on zinc ri- cinoleate chemistry, which it says is effective at eliminating odours evolving from products like hydrogen sulphide, mercaptan, thioether, isovaleric acid, amines, and ammonia. “Differently from other odours control additives in the market, the Tego Sorb series work in accordance with the ‘lock and key’ principle by irreversibly binding odour-causing molecules rather than covering up or masking odours with a scent,” says Ido Offenbach, Americas Segments Manager, Specialty Additives. “The Tego Sorb series enables an increase in the percentage of recycled materials in different application such as film packaging, automotive, and others.” Offenbach says two new masterbatches will soon come onto the market — Tego Sorb PY 30 PE and Tego Sorb PY 30 PP. Unlike the other Tego Sorb additives, these supress and eliminate malodour via two mechanisms — zinc ricinoleate and evaporation promotion of low molecular weight odour substances during processing using open vents via twin screw extruder. Masterbatch producer Ampacet has extended its OdorClear range of odour-absorbing master- batches for use with post-consumer recycled material. Originally introduced as Odor Scavenger, the newly-expanded range is designed to keep odour inside the polymer. The company says Odor- Clear masterbatches outperform conventional inorganic scavenging solutions and are designed
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