A kind of improved synthesis technique of bisphenol A cyanate resin monomer

Abstract

The invention discloses an improved synthesis process of a bisphenol A cyanate resin monomer. Through a stirring, crystallization, filtration and drying integrated machine, the cooling medium is circulated and cooled through a circulating liquid inlet and a circulating liquid outlet in the interlayer of the stirring tank. After phenol A, solvent, and cyanogen chloride, add triethylamine dropwise at low temperature, use the second deceleration motor to drive the stirring main shaft to rotate, and the stirring main shaft further drives the auxiliary shaft, support rod, and stirring frame to stir the materials, and the reinforcing plate makes the stirring frame The stirring is more stable, and the hardening of the reaction product is avoided, the reaction efficiency of the esterification reaction is improved, and the reaction time is saved. After testing, the yield of the finished bisphenol A cyanate resin monomer reaches 92.6%-93.5%, and the purity ≥99.2%, chloride ion content<10ppm, dielectric constant<3.0, dielectric loss tangent angle<0.005, glass transition temperature>260°C, thermal decomposition temperature>450°C.

Description

An improved synthesis process of bisphenol A cyanate resin monomer technical field The present invention relates to cyanate ester resin synthesis technical field, be specifically related to a kind of modification of bisphenol A cyanate ester resin monomer. into the synthesis process. Background technique Authorization bulletin number CN104961652B patent discloses a kind of synthetic method of bisphenol A type cyanate ester resin monomer, The specific steps are: dissolving bisphenol A in an alkane organic solvent containing 5 to 8 C atoms, and then dissolving the bisphenol A solution, halogenated Cyanogen and triethylamine are sprayed into the reaction vessel to achieve turbulent flow through different feed pipes at high speed, bisphenol A: cyanogen halide: triethyl The molar ratio of amine dosage is 1:1.1~1.5:1.2~1.9. The reaction temperature is ‑5℃‑15℃, and the reaction time is 3‑15 minutes. After the end, the bisphenol A cyanate will be precipitated by itself, a...

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Problems solved by technology

[0003] At present, the production process of bisphenol A cyanate resin mainly has the following problems: 1. The proportion of the reaction is unreasonable. It is also unstable; each batch of production will produce excessive solid waste residue simultaneously; 2, the recovery of isopropanol or toluene solvent adopts the mode of rectification to reclaim, and water and isopropanol azeotrope under an atmospheric pressure in theory contain 87.9% isopropanol Propanol, which exceeds the required 85% isopropanol content, can theoretically meet the use requirements by atmospheric distillation; 3. There are many post-processing steps and a long time for the product, and the yield and purity still need to be improved

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