Halogen-free flame-retardant epoxy resin composition and application thereof

Abstract

The invention relates to the field of high molecular materials, in particular to a halogen-free flame-retardant epoxy resin composition and application thereof. The composition comprises 100 parts ofepoxy resin, a halogen-free composite flame retardant provided with diphenylphosphine oxide flame-retardant groups, 5-15 parts of a main flame retardant, 0-10 parts of an auxiliary flame retardant, 2-30 parts of a curing agent and 0-1 part of a curing accelerating crosslinking agent. The composition further comprises a mixture of at least two of reinforced fibers, a flexibilizer, a filler, a silane coupling agent and a solvent. The composite flame retardant containing the diphenylphosphine oxide groups is high in flame-retarding efficiency and small in adding amount and has excellent compatibility and dispersity with the epoxy resin; and in the curing process, intermolecular dispersion with the epoxy resin can be realized, and the original transparent state of the epoxy resin is maintained. The finally cured flame-retardant resin composition has the advantages of low cost, high transparency, low water absorption rate, high glass conversion temperature, high thermal stability, low dielectric constant and dielectric loss, high flame retarding and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a halogen-free flame-retardant epoxy resin composition and its application. Background technique [0002] Epoxy resin is characterized by active epoxy groups in its molecular chain. The cured epoxy resin has excellent electrical properties, good mechanical properties and excellent chemical stability. It is widely used in aviation, Coatings, construction, adhesives, electronic copper clad laminates and many other fields. Because epoxy resin produces a lot of black smoke during combustion, and the oxygen index is around 20, which has a large flame spread hazard, so it is generally necessary to carry out flame retardant modification. At present, flame retardant epoxy resins are mostly used to introduce halogen atoms (chlorine, bromine, etc.) It is restricted in more and more fields, so the flame retardant technology of epoxy resin is gradually developing towards high efficiency, h...

AI Technical Summary

Problems solved by technology

At present, flame retardant epoxy resins are mostly used to introduce halogen atoms (chlorine, bromine, etc.) It is restricted in more and more fields, so the flame retardant technology of epoxy resin is gradually developing towards high efficiency, high flame retardancy, low smoke and low toxicity

[0003] Among them, phosphorus-containing flame retardants have the advantages of high flame-retardant efficiency and no toxic and harmful substances are released during combustion, and have become a research hotspot for flame-retardant epoxy resins. At present, the halogen-free flame retardants used in epoxy resins in industry are mainly DOPO Phosphorus-based flame retardants such as polyphosphazene (HPCTP), aluminum diethyl hypophosphite (ADP) and other phosphorus-based flame retardants are mainly used. The commonly used reactive flame-retardant DOPO and some derivatives thereof have a common problem: the prepared flame-retardant Epoxy resin reduces the Tg of flame retardant epoxy resin, and the dielectric properties are relatively poor

Additive phosphorus-based flame retardants are widely used due to the advantages of convenient use and high Tg, but currently additive flame retardants usually have various disadvantages in industrial applications: such as low melting point, easy precipitation, poor compatibility, and reduced mechanical properties And other issues

It has the disadvantages of complex process, high water absorption, insufficient heat resistance, and poor dielectric properties of the product

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