High-temperature-aging-resistant polypropylene composition

Abstract

The invention discloses a high-temperature-aging-resistant polypropylene composition, which belongs to the field of high polymer materials. According to the polypropylene composition, the hindered phenol antioxidant and the phosphite antioxidant with specific contents are added into the components to serve as a mixed antioxidant, and the apparent anti-aging effect is achieved due to the synergistic effect of the hindered phenol antioxidant and the phosphite antioxidant. Meanwhile, by limiting the specific types of hindered phenol antioxidants, the content of residual monomers of the hindered phenol antioxidants, and the thermogravimetric loss and phosphorus content of the phosphite ester antioxidants, the prepared polypropylene composition does not have the phenomenon of aging and yellowing even at a high temperature for a long time. The invention also provides a preparation method of the high-temperature-aging-resistant polypropylene composition. The preparation method is simple in operation steps and can realize industrial large-scale production. The invention also provides an application of the high-temperature-aging-resistant polypropylene composition in preparation of high-temperature-aging-resistant workpieces with color requirements.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-temperature aging-resistant polypropylene composition. Background technique [0002] There are unstable tertiary carbon atoms on the polypropylene (PP) chain, and the tertiary carbon atoms form tertiary carbon radicals in the presence of heat, light or oxygen. Tertiary carbon free radicals are very active, causing chain scission and degradation of polypropylene molecular chains, resulting in the aging of PP materials. For this reason, antioxidants must be added to delay or inhibit the aging process, thereby prolonging the storage period and service life of polypropylene and its products. The anti-heat aging additives of polypropylene are mainly hindered phenol antioxidants, but color reactions often occur during use, which affects the appearance and use of the product. [0003] CN111378228A discloses a anti-yellowing polypropylene compound and its preparation m...

AI Technical Summary

Problems solved by technology

[0006] However, although various types of antioxidants have been selected in the above-mentioned prior art, in the actual selection process, no technical indicators for the selection of antioxidants are given, and these indicators are often whether the final product has the ability to resist or not. The key to high temperature and aging resistance

For example, if the commonly used hindered phenolic antioxidants contain too much residual monomer, their antioxidant capacity will be significantly insufficient, and eventually the aging and yellowing of the used products will not be prevented; while the phosphorus content of phosphite antioxidants And thermal stability also often determines whether it has sufficient reducing ability

Images