How to make white rubber products do not yellow or delay yellowing time?
The process of yellowing resistance is very complicated and involves many aspects, but the prevention of a certain point is not up to standard.Yellow change is mainly formed by aging. Controlling yellowing is the process of controlling aging.
1, raw material itself yellow degeneration, for example, NR aging resistance than SBR and BR difference.2, the matching of accelerant system. The accelerator can use DM and M to achieve yellow change 4, but the whole system needs to be adjusted. The use of anti yellowing enhancers such as two dithiocarbamate on yellow Bianyou benefits, but at the expense of great property and operation. The faster the sulfidation rate, the less the chance of breaking the chain, and the aging degree is restrained. But at the same time sacrificing the comprehensive nature. The cross-linking bonds generated by rapid vulcanization and slow vulcanization are different. For example, tension, tear and so on, are greatly affected. But the elasticity brittleness will increase.
Then aging is divided into thermal aging, oxygen aging, ozone (electrostatic belongs to ozone, because static electricity produces ozone). Gas corrosion aging, heavy metals, oxidation aging. Reaction aging. UV aging and so on.
