Structure of steric hindrance adjustable weak base light stabilizer and preparation method and application thereof

The invention belongs to the field of new compounds and synthetic methods thereof, and particularly relates to a structure of a steric hindrance adjustable weak base light stabilizer and a preparationmethod and application thereof. According to the innovative light stabilizer, the steric hindrance is adjusted by establishing substituent groups generating steric hindrance around nitrogen atoms inthe seven structural general formulas, in addition, the electronegativity of the nitrogen atoms can be influenced by adjusting the distance of polar groups, and therefore the alkalinity or nucleophilicity of the nitrogen atoms is adjusted. The desired effect is obtained by regulating steric hindrance and nucleophilic property or alkalinity in the environment where nitrogen atoms are located, so that the application range of the innovative light stabilizer is widened, and the innovative light stabilizer is suitable for PC, polyester, PVC and other slightly acidic or certain electrophilic polymer materials to serve as a