Comparison Table of Common Antioxidant Types for PVC

1. Synergy: 1 + 1 > 2

Classic combination (phenolic compounds + phosphite esters)This is the most commonly used synergistic system. The primary antioxidant captures free radicals, while the secondary antioxidant decomposes peroxides. They work together to significantly enhance overall antioxidant efficiency. For example, the combination of antioxidants 1010 and 168 is an extremely common commercial pairing.

Cooperative combination (phenolic compounds + thioesters)In situations that require extremely strong processing stability, this combination is highly effective.

2. Selection based on processing technology and usage environment.

- General/Indoor ProductsYou can use hindered phenol antioxidants (such as BHT) alone, or use a simple phenol/phosphite compound system.

High-temperature processing/harsh environments: a collaborative system must be adopted.(For example, phenols + phosphites) to cope with high heat and shear stress during processing.

Outdoor weather-resistant productsRecommendation to use containingHALSThe system can provide comprehensive protection for PVC, ranging from light stability to thermal oxidation stability.

- Transparent/light-colored productsPreferentially choose uncolored hindered phenols and phosphites, avoiding the use of easily colored amines or contaminated varieties.

3. Precautions

Compatibility and PortabilityChoose an antioxidant with a molecular weight that matches the PVC polymer to prevent later blooming or precipitation.

Interaction with other additivesNote the compatibility of antioxidants with thermal stabilizers, lubricants, and other components in the formulation. For example, acidic environments may affect the efficacy of certain antioxidants (such as HALS).

I hope this comparison table can help you better master the "antioxidant guardian" in PVC formulations!