Excessive coupling agent is the main reason for the discoloration of SBS rubber liquid because the coupling agent will react with other components in the rubber during the reaction process to form colored substances, resulting in discoloration of the rubber liquid. Excessive coupling agent will increase the content of reaction products and further aggravate the discoloration of rubber liquid.

In addition, excessive coupling agent will also consume antioxidant, resulting in insufficient antioxidant content, which will affect the stability of rubber liquid and heat resistant oxygen capacity. In addition to excessive coupling agent, other factors can also cause rubber liquid discoloration. For example, insufficient or no antioxidant added will cause the rubber liquid to turn yellow. In addition, the rubber liquid stays in the tank for too long will also cause discoloration.

Therefore, controlling the amount of couplings and antioxidants, as well as timely spraying and shortening the residence time of rubber liquid in the tank are important measures to prevent rubber liquid discoloration. By analyzing the pH value and antioxidant content of the rubber liquid, it can be determined whether the addition of the coupling agent and antioxidant is appropriate, so as to control the discoloration of the rubber liquid.

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