Preparation method of one-component high-ortho-position thermosetting phenolic resin for pultrusion

Abstract

The invention discloses a method for preparing a single-component high-ortho thermosetting phenolic resin for pultrusion, which relates to a method for preparing a phenolic resin. First, paraformaldehyde is completely cracked to obtain a formaldehyde solution, and then a certain amount of acetic acid is first added, and then phenol and zinc oxide are added to make the reaction solution pH between 5-7, react at 80-95°C for 120-180min; then add other aldehyde raw materials and basic catalyst for reaction; when the Abbe refractive index of the reaction liquid is between 1.460-1.470, quickly cool down to 50~70℃, then add mixed phenol composed of resorcinol, m-cresol and 3,5 xylenol for reaction, after vacuum dehydration, add auxiliary materials into the reaction kettle, adjust the viscosity and discharge to obtain the product . The phenolic resin for pultrusion prepared by the invention has the advantages of environmental protection, low curing temperature, fast curing, long storage period, no bubbles during curing, high product strength, stable performance, good comprehensive performance and the like.

Description

technical field [0001] The invention relates to a method for preparing a thermosetting phenolic resin in the field of polymer chemistry, in particular to a method for preparing a single-component high-ortho thermosetting phenolic resin for pultrusion. Background technique [0002] Thermosetting phenolic resin is a liquid resin with a certain molecular mass and a certain viscosity obtained by adding and condensing phenol and formaldehyde under alkaline conditions and controlling a certain degree of reaction. According to the chemical structure and monomer functionality of the selected raw materials, the molar ratio of phenol to aldehyde, reaction time and temperature and other technological conditions, phenolic resins for different purposes can be prepared. The phenolic resin prepared by the conventional method at present has defects such as long curing time, short storage period, acid curing, or high temperature and high pressure to cure, and complicated molding process, whi...

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Problems solved by technology

The phenolic resins prepared by conventional methods have defects such as long curing time, short storage period, acid curing, high temperature and high pressure, and complicated molding process, which severely limit the application of phenolic resins in the field of pultruded FRP.

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