Medium-temperature fast-curing flame-retardant epoxy resin composition and flame-retardant prepreg

Abstract

The invention discloses a medium-temperature fast-curing flame-retardant epoxy resin composition and a flame-retardant prepreg. The composition is composed of bisphenol F epoxy resin, novolac epoxy resin, cyclotriphosphazene DOPO flame-retardant epoxy resin, a modified inorganic flame-retardant filler, a dicyandiamide curing agent and a modification accelerator; the resin composition is a composition cured at low temperature and stored at normal temperature. The resin composition is halogen-free, environment-friendly, efficient, flame-retardant, low in smoke amount, low in smoke toxicity and low in heat release, can be quickly cured for 5-10 minutes at the temperature of 150 DEG C by adopting a modification accelerator, has an ultra-long effective storage period at the normal temperature,and has the storage period of more than 30 days at the temperature of 25 DEG C. The flame-retardant prepreg laminated board has the advantages of quick curing at the medium temperature, long normal-temperature storage validity and longer operation time, has the characteristics of no halogen, environment friendliness, low smoke amount, low smoke toxicity, low heat release and the like, and meets the requirements of rail transit EN45545 / R1 / HL3 flame-retardant grade and aircraft cabin internal material FAR 25.853 flame-retardant grade.

Description

technical field [0001] The present invention relates to the technical field of the manufacture of environmentally friendly flame retardant epoxy resin composition and flame retardant prepreg, in particular to an environmentally friendly flame retardant epoxy resin composition that is rapidly cured at medium temperature, and to a flame retardant prepreg prepared from the composition. Dipping material. Background technique [0002] The flame retardant prepreg made of flame retardant epoxy resin is mainly used in the manufacture of flame retardant composite products. This kind of flame retardant composite material with low smoke generation, low smoke toxicity and low heat release is widely used in railway tracks Transportation interiors and structural parts, new energy vehicle battery boxes and cockpit parts, ship interiors and cabin structural parts, aircraft interiors, aircraft seats, electronic and electrical enclosures and parts, etc. [0003] The traditional epoxy resin c...

AI Technical Summary

Problems solved by technology

[0003] The traditional epoxy resin composition uses a modified imidazole accelerator and does not explain the modification method, but directly uses an unmodified imidazole accelerator. The epoxy resin composition prepared by this imidazole accelerator has a validity period of no more than 15 at normal temperature. Today, when the epoxy resin composition is produced by the solvent method, due to the need for back-end high-temperature baking to evaporate the solvent, it is easy to make the prepreg made of the epoxy resin composition without modifying the imidazole accelerator Material failure, especially the storage period at room temperature of 25°C is less than 15 days. The prepreg made of this epoxy resin composition cannot be transported at room temperature in summer. This epoxy resin composition is only used for prepreg When the temperature of the production workshop in summer is about 40 degrees, it is not suitable for making large-scale composite material products. Large-scale and complex composite material parts and components such as large-scale rail transit carriages, ships, airplanes, and buses are often produced in the process of laying layers. process takes a long time

At the same time, the production of prepregs from epoxy resin compositions containing solvent-based diluents such as acetone does not comply with the latest environmental protection regulations, so that the prepregs produced from this epoxy resin composition contain VOC, and the solvent is easy to volatilize during high temperature curing, resulting in relatively high temperature. High porosity damages the mechanical properties of composite products and the health of production workers

[0004] The curing time of the prepreg produced by the conventional medium temperature curing epoxy resin composition often takes several hours, the molding cycle is long, and the production efficiency is low. The rapid development of the traditional sports equipment industry, automobile lightweight and rail transportation and other fields makes the fiber The large-scale use of reinforced resin-based composite materials has become possible. The existing medium-temperature curing prepregs have a long curing time for the resin matrix and low production efficiency. The product of the present invention can be cured very well and quickly at a medium temperature of 120-150°C, and it only takes 5 minutes to be completely cured at 150°C, which can solve the problem of high-efficiency mass production