Causes: Impurity of white carbon black, which contains high temperature reaction or ultraviolet discoloring substances, causing yellowing; small molecules left over from high temperature decomposition of peroxide vulcanizing agents include yellowing; the residue of raw rubber, trimethylamine, due to oxidative discoloration.

Solution: Select precipitation method of white carbon black, do high temperature yellowing and ultraviolet yellowing experiments in advance; add anti-yellowing additives such as hydrogen-containing silicone oil and anti-yellowing vulcanizing agents to the compound rubber compound to improve; easy to remain in the raw rubber Small yellow molecules need to be controlled by raw material suppliers.