Epoxy resin fire retardant and preparation method thereof, as well as epoxy resin composition prepared from fire retardant

Abstract

The invention discloses an epoxy resin fire retardant and a preparation method thereof, as well as an epoxy resin composition prepared from the fire retardant. The fire retardant structurally comprises CNT (carbon nano tube)-nitrogen-phosphorus which is combined by chemical bonds. Not only can the fire retardant in a process of being heated and decomposing generate a large number of wormlike expansion carbon layers which are inlaid with one other so as to reduce thermal conductivity, but also can release phosphorus-containing strong acid and nitrogen-containing inert gas which can be respectively used for promoting an anti-flamed base material to dehydrate into carbon and reducing oxygen concentration. By a chemical reaction method, the fire retardant can be introduced into an epoxy cross-linking structure, because of the existence of the strong-polar chemical bonds, the fire retardant is prevented from migrating to the surface of a material, the epoxy resin composition is suitable forelectric and electrical engineering fields, the service life of the material is prolonged, and the safety of the material is improved.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Problems solved by technology

Halogen flame retardants will produce a large amount of toxic gases when they burn, which seriously pollute the environment and have been phased out. The thermal stability, compatibility with polymer matrix, permeability resistance and The processing performance is poor. The addition of nano-flame retardants to polymers will significantly reduce the mechanical properties of materials. The intumescent synergistic flame retardants represented by phosphorus-nitrogen have little improvement in the LOI of materials due to the lack of effective carbon sources.

[0004] US5277887 uses ammonium orthophosphate and phosphorus pentoxide as raw materials to prepare water-insoluble chain ammonium polyphosphate (APP) as a flame retardant for epoxy resins. The strong acid produced by the combustion and decomposition of the flame retardant promotes the development of the flame-retardant substrate. Dehydration into carbon, but due to the lack of synergistic flame retardant effect of the flame retardant system, the improvement of the material LOI is small

[0005] EP3531500 proposes to coat APP with melamine formaldehyde resin to form a microcapsule structure, and the flame retardant effect reaches UL-94VO level. Since the purpose of microencapsulation is mainly to reduce the water solubility of the flame retardant, there is no gap between the flame retardant and the matrix resin. The combination of chemical bonds makes the flame retardant easy to migrate and precipitate in the resin, which affects the performance of the material

[0006] CN105778152A provides a nitrogen-containing compound (3-amino-1,2,4-triazole) to modify carbon nanotubes, and introduce a compound with a high content of flame-retardant element N on the surface of carbon nanotubes.

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