The reaction kettle of this product can be designed in a large tank and can be automatically produced. The feeding and process conditions are stable, and the product quality level is good. Enterprises using this product can react with carbon alcohols through formula design and esterification to produce products that meet the characteristics of various processing conditions. It can be used in combination with metal soap salts to play an excellent synergistic effect, such as ensuring heat resistance in the production process of PVC film, improving coloring and transparency, and forming wrong salts with chloride generated by the decomposition of PVC, delaying the stability in the later stage of processing. It can also be used as a time-storage stabilizer for PU raw material TDI. In application, this product can be used in combination with other phosphites or directly added to stabilizer formulations or added to PVC batching materials alone.