Halogen-free resin composition, and prepreg and laminated boards which are prepared from halogen-free resin composition
A resin composition and composition technology, applied in the field of resin composition, halogen-free resin composition and prepreg and laminated board for printed circuit, can solve the problem of benzoxazine brittleness and processability Bad, impact and other problems, to achieve the effect of improving dielectric properties, improving machining performance, and reducing water absorption
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preparation example B1
[0079] The synthesis of preparation example B1 component benzoxazine resin
[0080] (1) Add 4-tert-butylphenol and 4-tert-octylphenol to the reactor at a molar ratio of 1:1, heat to 100°C, slowly add an appropriate amount of oxalic acid and formaldehyde aqueous solution, and reflux for 3-6 hours. Then the product is precipitated in water, and the solid is obtained after normal pressure and vacuum distillation;
[0081] (2) With the molar ratio of phenolic hydroxyl, amino, and aldehyde functional groups as 1:1:2, add the product of step (1), aniline, and paraformaldehyde in turn, and adjust the pH value to 8-10 with NaOH; stir evenly Afterwards, the temperature was raised to reflux, and the device was cooled after reacting for 3 hours to obtain a light yellow translucent viscous body. After washing, purification and drying, the benzoxazine B1 component with the following structural formula was obtained with a yield of 81%.
[0082]
[0083] Where R1, R6 are
[0084] In t...
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