Halogen-free flame-retardant prepolymer and prepreg and laminated board made from same

Abstract

The invention discloses a halogen-free flame-retardant prepolymer which is prepared according to a method comprising the following steps of: heating a phosphorus-containing mixture and a cyanate resin monomer to 100-150 DEG C; reacting for 2-12 hours under the condition of keeping stirring; and cooling to room temperature to obtain the halogen-free flame-retardant prepolymer. The phosphorus-containing mixture: the cyanate resin monomer is equal to (15-65):(20-80) in parts by weight; the phosphorus-containing mixture comprises DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), DOPO-HQ (10-(2,5-dihydroxyphenyl)-9,10-dihydro-9-xa-10-phosphaphenanthrene-10-oxide) and DDP(10-(2,5-dicarboxylpropyl)9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide); and the weight ratio of DOPO to DOPO-HQ to DDP is (20-85): (15-65): (0-20). The novel halogen-free flame-retardant prepolymer disclosed by the invention has good technology capability and can realize the halogen-free flame retardance, achieve excellent wet-heat resistance and heat resistance and low heat expansion coefficient and meet the requirements of a base material of a high-property printed wiring board.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and relates to a halogen-free flame-retardant prepolymer and a prepreg and a laminate made of the same, which can be applied to the fields of integrated circuit packaging, high-frequency, high-speed and high-density interconnection, and the like. Background technique [0002] As one of the high-performance resin matrices, cyanate resin is widely used in aerospace, aviation and other fields due to its excellent dielectric properties, heat resistance, high glass transition temperature and low water absorption. . However, the current disadvantage of cyanate ester resin is its poor flame retardancy (UL94V-2 grade), and when it is used in electronics and other fields, its flame retardancy must meet the requirements of UL94V-0 grade. Therefore, it is necessary to improve the flame retardancy of cyanate resins. [0003] In recent years, due to strict laws, regulations and environmental pr...

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Problems solved by technology

[0004] At present, there are mainly two methods to solve the halogen-free flame retardancy of cyanate resin and its system: (1) Adding inorganic fillers directly into the resin matrix, such as aluminum hydroxide, magnesium hydroxide and other inorganic compounds containing crystal water; Although this method can improve the flame retardancy of the cyanate ester resin system to a certain extent, due to its low flame retardancy efficiency, a large amount of filling is required to reach the UL94V-0 level, and there is a problem of interfacial bonding, so it deteriorates Mechanical properties of cyanate resin; (2) Intrinsic flame retardancy, that is, the introduction of flame retardant groups on the skeleton of cyanate resin; Effectiveness and main direction of cyanate resin

For example, Japanese patent (publication number: 2003-128785) uses 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (referred to as DOPO-HQ ) into the cyanate resin skeleton, however, due to the low phosphorus content in the synthesized product (maximum 1.5%), it cannot reach the UL94V-0 level, and in order to achieve the UL94V-0 level, it is necessary to add phosphorus-containing epoxy resin and Epoxy resins with intrinsic flame retardancy (such as biphenyl resins), which in turn lead to the deterioration of the excellent performance of cyanate ester resins

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