Polymerized high-molecular-weight sterically hindered amine and preparation method thereof

A polymerized high-molecular-weight sterically hindered amine, wherein the polymerized high-molecular-weight sterically hindered amine is selected from the following structures:

• mn is an integer between 2-20;
• Q1, Q2 and Q3 are independently selected from —O—, —CO—O—, —CO—NR22— or —NR22—;
• R22 is independently selected from hydrogen and C1-C20 alkyl;
• R1 and R2 are independently selected from hydrogen, and C1-C40 alkyl, wherein any one or more of the H atoms in the alkyl can be substituted with —R21, —OR21, —COOR21 or —COR21;
• R3 is selected from C1-C40 alkylene, wherein any one or more of the H atoms in the alkylene can be substituted with —R21, —OR21, —COOR21 or —COR21;
• the total number of carbon atoms in —R1, R2 and R3 is 40 or less;
• R7 and R8 are independently selected from hydrogen, unsubstituted C1-C20 alkyl or C1-C20 alkyl substituted with —R21;
• or, R7, R8 and the N atom between R7 and R8 form unsubstituted C3-C12 cycloalkylene or C2-C12 heterocycloalkylene;
• R4 and R5 are independently selected from hydrogen, and C1-C40 alkyl, wherein any one or more of the H atoms in the alkyl can be substituted with —R21, —OR21, —COOR21 or —COR21;
• R6 is selected from C1-C40 alkylene, wherein any one or more of the H atoms in the alkylene can be substituted with —R21, —OR21, —COOR21 or —COR21;
• and the total number of carbon atoms in —R4, R5 and R6 is 40 or less;
• and
• R12 and R13 are independently selected from hydrogen, unsubstituted C4-C30 alkyl or C4-C30 alkyl wherein any one or more of the H atoms in the alkyl can be subsiitute with hydroxyl, —NO2, halogen, amino, cyano, —R21, —OR21, —COOOR21, —COR21 or C1-C10 alkyl,
• R21 is selected from C1-C20 alkyl.