Transparent epoxy nanometer composite material, preparation method and application thereof

Abstract

The invention relates to transparent epoxy nano composite material, and a preparation method and purposes thereof. The composite material comprises epoxy resin matrix material and composite nano inorganic filler which is evenly distributed in the epoxy resin matrix material; the composite nano inorganic filler consists of a zinc oxide quantum dot which is taken as a core and has grain size of 2nmto 10nm and a silicon dioxide outer layer which is taken as a shell and coated on the zinc oxide quantum dot; the epoxy resin matrix material consists of epoxy resin and epoxy curing agent; the epoxyresin is bisphenol-A epoxy resin or hydrogenated bisphenol-A epoxy resin; the epoxy curing agent is estolide curing agent which contains 1.0 weight percent to 5.0 weight percent of curing accelerator; the curing accelerator is amine curing accelerator or imidazole curing accelerator. The transparent epoxy nano composite material of the invention has excellent transparency, good fluorescence and phosphorescence effect compared with common pure transparent epoxy, and can replace traditional fluorescent powder. The invention is applicable in packaging LED and other luminescent semiconductor devices.

Description

technical field The present invention relates to a kind of transparent epoxy nanocomposite material and its preparation method and application, more specifically, the present invention relates to a kind of transparent epoxy nanocomposite material whose filler is the composite nanoparticle with core-shell structure and its preparation method and uses. Background technique Current scientific research has found that photoaging in white light emitting diodes (Light emitting diodes, LEDs) is not the only reason for the aging of epoxy resins, and another reason for the shortened lifespan of white light LEDs is the scattering effect of phosphors. In the actual application of LEDs, the main way to avoid the aging of epoxy resin caused by phosphor scattering is to keep the phosphor layer as far away from the LED chip as possible. However, although this method can alleviate the negative impact caused by phosphor light scattering to a certain extent, it cannot completely solve this pr...

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Problems solved by technology

However, this compensation is limited when the prepared material is a thick block, and it is impossible to prepare a nanocomposite with a high filler content. For example, we have prepared a transparent epoxy / ZnO nanocomposite (Polymer, 47( 2006) 2127-2132), when the ZnO content is lower than 0.07%, the addition of fillers has little effect on the visible light transmittance of the composite material, and when the ZnO content exceeds 0.07%, the visible light transmittance drops sharply

In addition, if the particle size of the filler is too small (such as less than 20nm), the specific surface area of ​​the filler will increase sharply, and the agglomeration phenomenon will also intensify. After adding the epoxy prepolymer, the viscosity of the mixture will increase, and the force between the filler and the matrix interface will increase. effect, resulting in severe agglomeration of nanofillers and inability to effectively disperse in the epoxy matrix

These agglomerated particles will cause light scattering in the composite material, resulting in a decrease in the light transmittance of the material

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