Why hydrogenated epoxy resin can improve weather resistance?

Good afternoon. Not only epoxy resin, but also many other organic chemicals, such as hydrogenated vegetable oil, hydrogenated rosin and hydrogenated petroleum resin C5, have greatly improved the weather resistance. After hydrogenation, all the oxygen-containing groups in the molecular chain are blocked, and hydrogen which is very difficult to dissociate is connected, or the original molecule is directly replaced after hydrogenation-so you can see that the hydrogenated product is almost pure and transparent, and the original light yellow or dark yellow is gone. Because outdoor weatherability generally only involves ultraviolet rays and oxidation, the end capping after hydrogenation is not sensitive to both, so outdoor weatherability will be greatly increased, which is also the reason why hydrogenated organic chemicals are extremely resistant to yellowing and basically do not oxidize. Please refer to. Generally, epoxy resin is prone to yellowing and cracking without adding 53 1 650 and other ultraviolet shielding agents, and this phenomenon will not occur again after hydrogenation.