Material Characteristics Overview
Phenylvinyl silicone resin is a specially modified organosilicon material with phenyl and vinyl groups introduced into its molecular structure. This structure gives the material excellent aging resistance, UV resistance, and non-yellowing characteristics during long-term use. Phenylvinyl silicone resin can operate continuously at 180°C and withstand temperatures above 300°C for short periods.

MQ/VMQ/HVQ systems are different types of silicone rubber systems:
MQ silicone resin: Has a three-dimensional spherical structure, usually colorless and transparent or white, but oxidizes and turns yellow under high temperature and light.
VMQ silicone resin: Yellowing can be inhibited through specific formulations (such as vinyl-containing MQ silicone resin).
HVQ silicone resin: Less information is available, but similar to PVC materials, it will yellow at high temperatures due to dehydrochlorination reactions.
Comparison of Heat Resistance and Yellowing Performance
Phenylvinyl Material
Excellent long-term non-yellowing characteristics
Remains stable in high-temperature environments (180-300°C)
Excellent UV resistance, no yellowing during long-term use
Phenyl groups in the molecular structure enhance thermal stability
MQ/VMQ/HVQ Systems
MQ silicone resin: Easily oxidizes and turns yellow under high temperature and light; color change can be used as a quality indicator.
VMQ silicone resin: Adding vinyl-containing MQ silicone resin can significantly inhibit yellowing caused by the reduction of the catalyst.
HVQ silicone resin: Yellows at high temperatures due to dehydrochlorination reactions, forming conjugated polyene structures. Key Influencing Factors Analysis
Temperature: High temperatures accelerate the oxidative degradation process of all materials.
Light Exposure: Ultraviolet light triggers photo-oxidation reactions in materials.
Additives:
Phenylvinyl materials inherently possess anti-yellowing properties.
MQ/VMQ systems require the addition of specific stabilizers (such as vinyl MQ silicone resin) to improve yellowing resistance.
Molecular Structure:
The benzene ring structure of phenylvinyl enhances thermal stability.
The three-dimensional structure of MQ makes it more susceptible to oxidation.
Application Scenario Recommendations
High-Temperature Long-Term Use Environment: Phenylvinyl materials are recommended due to their superior long-term yellowing resistance.
Short-Term High-Temperature Applications: Specific formulations of VMQ silicone resin (containing vinyl MQ silicone resin) can be considered.
Optically Transparent Applications: VMQ silicone resin can achieve optical-grade transparency and yellowing resistance through purification treatment.
Cost-Sensitive Applications: MQ silicone resin is less expensive, but its poorer yellowing resistance must be accepted.
Conclusion
Phenylvinyl silicone resin significantly outperforms MQ/VMQ/HVQ systems in terms of heat-induced yellowing resistance, especially in long-term high-temperature applications. While the MQ/VMQ system can partially improve its yellowing resistance through specific formulations (such as adding vinyl MQ silicone resin), its overall performance is still inferior to phenylvinyl materials. The HVQ system is prone to dehydrochlorination reactions at high temperatures, leading to yellowing, and has the worst heat-induced yellowing resistance. Material selection should be based on a comprehensive consideration of the specific application's temperature requirements, usage duration, and cost budget.