Low-temperature cured normal-temperature stored flame-retardant epoxy resin composition and flame-retardant prepreg

Abstract

The invention discloses a low-temperature cured normal-temperature stored flame-retardant epoxy resin composition and a flame-retardant prepreg. The composition is a low-temperature cured normal-temperature stored composition composed of bisphenol F epoxy resin, novolac epoxy resin, a phosphorus-silicon-boron flame retardant, a modified inorganic flame-retardant filler and a modified low-temperature cured latent curing agent. The low-temperature cured normal-temperature stored flame-retardant epoxy resin composition is halogen-free, environment-friendly, efficient flame retardant, low in smokeamount, low in smoke toxicity and low in heat release, can be quickly cured at low temperature by adopting a modified low-temperature curing agent, and has an ultra-long effective storage period at normal temperature; and the flame-retardant composite board prepared from the flame-retardant prepreg has the characteristics of high low-temperature curing speed, capability of being completely curedwithin 4 hours at 80 DEG C, long shelf life which is more than 30 days at room temperature, longer operating time, no halogen, environment friendliness, no VOC, 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 invention relates to the technical field of flame retardant epoxy resin composition cured at low temperature and stored at normal temperature and the manufacture of flame retardant prepreg, in particular to a flame retardant epoxy resin composition cured at low temperature and stored at normal temperature, and more particularly to a preparation of the composition flame retardant prepregs. 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] When the epoxy...

AI Technical Summary

Problems solved by technology

[0003] When the epoxy resin composition is produced by the solvent method, since the back-end high-temperature baking is required to volatilize the solvent, it is easy to make the prepreg made of the epoxy resin composition without modifying the latent curing agent. Failure, especially the storage period at room temperature of 25°C is only about 15 days. The prepreg made of this epoxy resin composition cannot be transported at room temperature in summer, and the prepreg made of this epoxy resin composition cannot be transported in summer. When the temperature of the production workshop is about 40 degrees, the working time of continuous operation cannot exceed 48 hours, which is not suitable for making large-scale composite products, large rail transit carriages, ships, aircraft, passenger cars and other large and complex composite parts In the process of product production, it often takes more than 48 hours for the production process such as layering

At the same time, the production of prepregs with epoxy resin compositions containing solvents such as acetone does not comply with the latest environmental regulations, so that the prepregs produced with this epoxy resin composition contain VOC, and the solvent is easy to volatilize during high temperature curing, resulting in higher porosity The rate of damage to the mechanical properties of composite products and the health of production employees

[0004] The curing temperature of the prepreg produced by the conventional epoxy resin composition is often higher than 120°C. The problem caused by this is that it is necessary to use a high-cost high-temperature resistant mold, which cannot be used when making large-scale and complex composite products. Autoclave curing requires a low-cost oven or drying room that can be cured at a low temperature of 70~90°C