摘要：Attention should be paid to the following matters during the application process. If the ingredients contain active components suc

Why does the order of use of coupling agents directly affect the performance of the final product during material processing?

Attention should be paid to the following matters during the application process. If the ingredients contain active components such as zinc oxide and stearic acid, it is necessary to ensure that the filler, polyvinyl chloride resin, and plasticizer are fully mixed before adding the above active substances to avoid their preferential reaction with the coupling agent, which may lead to a decrease in coupling efficiency. Due to the tendency of most titanium ester coupling agents to undergo ester crosslinking reactions with polyester and polyester plasticizers, it is recommended to use pretreatment processes or strictly follow the feeding sequence, that is, to introduce polyester plasticizers after the coupling agent has completed its action.

Although titanium esters and organic silicon coupling agents have a synergistic effect, there is proton competition between the two on the surface of the filler. Therefore, in practical operation, organic silicon coupling agents should be added first, followed by titanium ester coupling agents. The physical and chemical properties of fillers, such as moisture content, geometric shape, acidity and alkalinity, and chemical composition, all have a significant impact on the coupling effect. Under normal circumstances, the coupling efficiency of titanate esters in coarse particle fillers is lower than that in fine particle fillers; Monoalkoxytitanate is more suitable for dry packing systems, while pyrophosphate based titanate exhibits better adaptability to wet packing with high specific surface area.

The storage conditions of coupling agents should meet the requirements of sealing and avoiding light, and be placed in a cool, dry, and well ventilated storage environment. Their regular shelf life is twelve months.

来源：躺平闲聊天