Low dielectric resin composition with phosphorus-containing flame retardant and preparation method and application thereof

A low dielectric resin composition with phosphorus-containing flame retardant, comprising the following components:

• (A) 25 to 90 parts by weight of a phosphorus-containing flame retardant;
• and
• (B) 100 parts by weight of a vinyl compound;
• wherein, the phosphorus-containing flame retardant has a structure as shown in formula (I):
• wherein, A is a covalent bond, C6˜C12 arylene, C3˜C12 cycloalkylene, C6˜C12 cycloalkenylene, methylene or C2˜C12 alkylene;
• R1 and R2 are the same or different, and are each a H, alkoxy, aryloxy, alkyl, aryl or silyl, respectively;
• R3 and R4 are the same or different, and are each a H, hydroxyl, and C1˜C6 alkyl, respectively, or one and only one of R3 and R4 forms a carbonyl with a C;
• each of n is a positive integer of 1˜6 independently,
• wherein the vinyl compound is a vinyl polyphenylene ether resin having a structure as shown below in formula (XVI)
• wherein, —(O—X—O)— refers to
• —(Y—O)— refers to
• R5 and R6 are each a hydrogen atom, R7, R8, R9, R10 and R11 are the same or different, and are each a hydrogen atom, halogen atom, alkyl, or halogen-substituted alkyl respectively;
• R12, R13, R18 and R19 are the same or different, and are each a halogen atom, C1-C6 alkyl or phenyl respectively;
• R14, R15, R16 and R17 are the same or different, and are each a hydrogen atom, halogen atom, C1-C6 alkyl or phenyl respectively;
• R20, R21, R22, R23, R24, R25, R26 and R27 are the same or different, and are each a halogen atom, C1-C6 alkyl, phenyl or hydrogen atom;
• A is a C1-C20 linear, branched, or cyclic alkylene;
• R28 and R29 are the same or different, and are each a halogen atom, C1-C6 alkyl or phenyl respectively;
• R30 and R31 are the same or different, and are each a hydrogen atom, halogen atom, C1˜C6 alkyl or phenyl respectively;
• Z represents an organic group having at least one carbon atom;
• and
• a and b are each a natural number of 1˜30, respectively.