Production method of solid-thermosetting phenolic resin

Abstract

The invention discloses a production method of a solid-thermosetting phenolic resin. The production method is characterized by comprising the following steps: mixing and evenly stirring phenol, a base catalyst and aldehyde which are respectively weighed, and heating for the reaction; after the reaction is finished, adding an acidic neutralizer for neutralization, and then adding a non-proton organic solvent; standing for layering the material into a lower-layer water phase, a middle-layer resin phase and an upper-layer solvent phase, separating out the lower-layer water phase and the upper-layer solvent phase, and retaining the middle resin phase; adding an alcohol or ketone organic solvent in the middle-layer resin phase; turning on a film evaporator, transporting the dissolved material to the film evaporator for vacuum dehydration; directly cooling and granulating the qualified resin and packaging; and recovering the solvents for repeated use. By the production method, the softening point of the resin is improved, evaporation efficiency is improved, energy consumption is reduced, and process time is shortened.

Description

technical field [0001] The invention relates to a production method of phenolic resin, in particular to a production method of solid thermosetting phenolic resin, the solid thermosetting phenolic resin produced by this method is suitable for epoxy curing agent, electronic molding compound, friction material, phenolic fiber , Foundry coated sand and other industries. Background technique [0002] Phenolic resin has heat resistance, insulation, high temperature resistance, corrosion resistance and good mechanical processing properties, and can be used in the manufacture of copper clad laminates for printed circuit boards, plastic packaging materials, molding compounds, laminated plastics, foam plastics, honeycomb plastics, etc. It can be used as paint raw material, adhesive, phenolic epoxy resin, anti-corrosion cement, phenolic fiber and ion exchange resin based on phenolic resin, etc. It can also be used as an adhesive for grinding wheels and brake pad metal casting models. I...

AI Technical Summary

Problems solved by technology

The disadvantage of these methods is that due to the formula, process, equipment and other reasons, and the dehydration is carried out in the evaporator or reactor, it is necessary to ensure a high enough temperature during dehydration to keep the resin with a satisfactory softening point in liquid state; due to the relatively high temperature in the kettle, the resin will continue to undergo condensation reaction at a higher temperature, the molecular weight will continue to increase, and the softening point will become higher and higher with time, and eventually it will be uncontrollable. Cross-linking and hardening take place, and detonation occurs, causing irreparable loss of product and destructive loss of equipment. Therefore, the reports of existing domestic thermosetting phenol-formaldehyde solid resins have no detailed reports on solving this problem, and Most of them are laboratory processes, and there are relatively few articles related to solid thermosetting phenolic resins