Preparation method of halogen-free flame-retardant paper-based copper-clad plate

Abstract

The invention relates to a preparation method of a halogen-free flame-retardant paper-based copper-clad plate. The method comprises the following steps: a) synthesizing resin: reacting tung oil with phenol under acid catalysis, adding epoxidized soybean oil to continuously react to generate a tung oil-soybean oil-phenol addition product, and performing condensation reaction with formaldehyde under alkali catalysis to prepare double-oil modified phenolic resin; b) preparing glue: preparing a first group of glue solution mainly applied to main resin of an inner layer paper prepreg and preparing glue and preparing a second group of glue solution mainly applied to an outer layer glass fiber cloth prepreg; c) hanging glue: preparing the inner layer paper prepreg by using the first group of glue solution and preparing the outer layer glass fiber cloth prepreg by using the second group of glue solution; and d) preparing the plate: overlapping and pressing the inner layer paper prepreg and the outer layer glass fiber cloth prepreg through the common paper-based plate. The halogen-free flame-retardant paper-based copper-clad plate can solve the problem of heat-resistance rampant of the conventional paper-based plate.

Description

technical field [0001] The invention relates to a method for manufacturing a paper-based copper-clad laminate, in particular to a method for manufacturing a halogen-free flame-retardant paper-based copper-clad laminate. Background technique [0002] Paper-based copper clad laminates are one of the main types of copper clad laminates, and are widely used in household electronic products such as TVs. During its production and use, safety and reliability are important standards for products. According to statutory requirements, the flame retardancy of paper-based copper-clad laminates used in some electronic products must reach the UL94V-0 level. At present, in the production of flame-retardant paper-based copper clad laminates, halogen flame retardants and a certain amount of antimony compounds are mainly used for synergistic flame retardancy. But in the process of burning, it will release toxic substances, which will affect people's health and pollute the environment. The ...

AI Technical Summary

Problems solved by technology

[0003] At present, halogen-free flame-retardant paper-based copper-clad laminates are mainly flame-retardant through phenolic resin modified with tung oil or epoxy soybean oil, and phosphate esters are added. The epoxy used for the outer layer of glass fiber cloth prepreg and the inner layer The phenolic epoxy compatibility of cellulose paper prepreg is poor, which directly leads to its poor heat resistance and high water absorption.

[0004] Phenolic resin is a kind of synthetic resin that was first discovered and produced industrially. However, the halogen-free flame-retardant paper-based copper-clad laminate prepared by using modified phenolic resin has problems such as poor heat resistance, low bending strength, and poor flame retardancy.