A kind of preparation method of renewable phenolic resin at room temperature and its recovery process and application

Abstract

A method for preparing a room-temperature renewable phenolic resin and its recycling process and application. In terms of parts by mass, 100 parts of thermoplastic phenolic resin and 18.4-55 parts of boric acid compounds are melt-blended at 60-100°C to obtain boron-containing Thermoplastic phenolic resin; or dissolve 100 parts of thermoplastic phenolic resin and 20 to 50 parts of boric acid compounds in 40 to 60 parts of low-boiling point organic solvents to obtain boron-containing thermoplastic phenolic resin; then solidify to obtain room temperature renewable phenolic resin resin. The preparation process of the resin of the invention is simple, and can be recovered under the mixed solvent of ethanol and water at room temperature, and the resin can be used to prepare recyclable fiber-reinforced boron-containing thermoplastic phenolic resin-based composite materials. The boron-containing thermoplastic phenolic resin prepared by the invention can not only give full play to the promotion effect of the aryl borate structure on the heat resistance of the thermoplastic phenolic resin, but also take into account the manufacturability of the resin and the mechanical properties of the composite material.

Description

technical field [0001] The invention relates to a preparation method of a room-temperature renewable phenolic resin, a recovery process and application thereof. Background technique [0002] Phenolic resin, as one of the important thermosetting resin varieties, has a history of more than one hundred years so far. Due to the availability of raw materials, low cost, and good mechanical properties, heat resistance, and electrical properties, phenolic resins are widely used in the field of advanced composite materials, for example, for processing into resin-based composites with good ablation resistance and carbon / carbon composite. As we all know, only when phenolic resin is cured to form a three-dimensional cross-linked structure can it become a material with practical value. However, cured phenolic resins are quite stable, both to heat and to media (including common inorganic media such as acidic, alkaline, and neutral water, and various organic solvents). This valuable p...

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Problems solved by technology

[0004] It can be seen that although the traditional recovery method has solved the difficult problem of PR recovery to a certain extent, it is still unable to realize the resolidification and recycling of the recovered resin product, and the mixture of phenol and its derivatives is usually obtained, and the recovery cost is relatively high. High, while the recovery conditions are relatively harsh (need high temperature or catalyst)

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