Phenolic antioxidants u2014 BHT and TBHQ u2014 that protect polyolefins, styrenics, and resins from thermal and oxidative degradation during processing and service.
Polymer antioxidants are additives that interrupt the oxidation reactions thatndegrade plastics during processing and in service. They protect against the heatnand shear of compounding and against long-term thermal aging in the finished part.nHindered phenols such as BHT are the primary class for polyolefins and styrenics. Add thenantioxidant at the masterbatch or compounding stage so it is distributed through the meltnbefore the polymer sees its first heat history.
nnBHT is the low-cost workhorse phenolic antioxidant: effective, widely available, and easynto disperse. The trade-off is volatility. BHT can evaporate during high-temperaturenprocessing and migrate or bloom out of thin sections over time, so the protection may notnlast the full service life of a thick or hot-running part. For durable goods, formulatorsnoften pair a primary phenol with a secondary phosphite; for short-life or cost-drivennitems, BHT on its own is adequate.
nntert-Butylhydroquinone (TBHQ) is a second hindered-phenol option, also used as anpolymerization inhibitor in monomers and unsaturated polyester resins. Choose thenantioxidant by part thickness, processing temperature, and required service life rathernthan by unit cost alone. Dose to the resin supplier's recommended range: over-additionnwastes additive and can cause plate-out, while under-addition shows up as yellowing,nembrittlement, or melt-flow drift during processing.
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