Industrial production method of high-purity linear phenolic resin

Abstract

The invention relates to the technical field of polymer synthesis of phenolic resin, in particular to a refinement process of linear phenolic resin. The process comprises the steps as follows: (1) putting phenol in a reactor, adding oxalic acid, heating the reactor to 80-100 DEG C, and dropwise adding formalin to the reactor; (2) after dropwise adding the formalin, keeping the temperature, and adding oxalic acid until the pH of the mixed solution in the reactor is 4-6; (3) adding a solvent to the reactor continuously; (4) transferring all materials in the reactor into an extraction kettle, adding water to the extraction kettle for extraction, and separating a water phase; (5) repeating washing operation in step (4) until the pH value of the materials is 6-7 to obtain a crude phenolic resinsolution; (6) transferring the crude phenolic resin solution into a dehydration kettle, and removing residual water under negative pressure; (7) coarsely removing the solvent and small-molecular impurities out of the phenolic resin by a multistage falling-film evaporator, and refining the phenolic resin by a multistage wiped-film evaporator group; (8) granulating the phenolic resin by a drum granulator to obtain a high-purity linear phenolic resin product.

Description

technical field [0001] The invention relates to the technical field of phenolic resin polymer synthesis, in particular to a refining process of novolac resin. Background technique [0002] Integrated circuit packaging is an important part of the integrated circuit industry chain. Its role is to undertake the process of integrated circuit manufacturing, protect the chip and provide signal transmission between the chip and other system components. With the high integration of integrated circuits, the increase of chip and packaging area, and the thinning of packaging layers, higher and more comprehensive requirements are put forward for packaging materials. [0003] Novolac epoxy resin is the main material of integrated circuit packaging, because it needs to be in direct contact with the etched very fine silicon chip and aluminum leads during packaging, so the purity of novolac epoxy resin is highly required. [0004] Novolak resin is the main raw material for preparing novola...

AI Technical Summary

Problems solved by technology

[0005] In the existing production technology of novolac resin in China, the resin is mostly purified through raw material synthesis, steam distillation, hot filtration and vacuum drying, but the process is complicated, inefficient, time-consuming and energy-consuming, difficult to scale up and continuous production

Patent CN 102181026 B and Patent CN 104262558 B mention the use of thin film evaporator for refining, but the description is vague, and practice has proved that the pure use of one and one-stage thin film evaporators cannot meet the purity requirements of novolac resin

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