Chemical factory: Let's talk about why alumina fillers should be surface modified?

With the rapid development and application of composite material exploration, the filler, which is one of the two components of composite material, has received more and more attention from the public.Fillers are a key way of material modification. They can not only greatly reduce the cost of raw materials, but also significantly improve the various characteristics of raw materials, shape new characteristics of raw materials, and expand their application areas.

Because of its strong temperature resistance, stable crystal phase, high hardness, high wear resistance, etc., alumina is widely used in a variety of plastics, plastics, porcelain, refractory insulation materials and other reinforcement fillers. In addition, because of its high resistance and good insulation properties, alumina can be used in integrated circuit chip substrates.

Why modify the material?Because the surface of alumina is very polar and the compatibility between it and the organic resin substrate is relatively poor, it is difficult to disperse evenly in the polymer.Moreover, the interfacial tension between alumina particles and organic resins is not the same, which makes it difficult for the polymer material substrate to wet the surface of the particles, which may cause a gap between the two, which reduces the physical properties of the composite material and enhances the interfacial thermal resistance of the composite material.

High filling volume will also lead to improved material performance, but it will also bring some problems.For example, when alumina is used as a thermally conductive filler, its own thermal conductivity is not too high, and the high filling volume can obtain better thermal conductivity, which makes it difficult for the viscosity of the composite material to expand and meet the requirements of engineering construction fluidity, and it also greatly reduces the physical properties.However, after the filling amount is higher than a certain value, the alumina particles are very easy to reunite, and the characteristics will not be well improved.

Therefore, it is necessary to solve the surface activity of the filler, reduce the reunion between alumina particles, improve the surface compatibility of alumina powder with the polymer material substrate, and improve its permeability and filling symmetry in the polymer material substrate, so as to obtain a composite material with excellent characteristics.

Chemical factory: The use of high-purity alumina in optical materials

1. High-purity alumina is the main optical material for the preparation of three-color aluminophosphate series products for LED lighting, luminous powder and long afterglow phosphor.Since the speed of fluorescent tubes made of three-primary color luminous powder is twice that of fluorescent tubes made of halogen bulb powder, a 20-watt fluorescent tube can be as bright as a 40-watt fluorescent tube, which is also called an energy-saving tube.

2. The completion of LED lighting is mainly done by the cooperation of LED chips and optical materials.High-purity alumina has key hazards to the luminous efficiency, color rendering index and service life of LED components. In recent years, the exploration of yellow, red and green optical materials for aluminosilicate, nitrogen compound and nitrogen oxide series products used in LED chip manufacturing has made great progress.Among them, garnet aluminophosphate luminous powder has irreplaceable effects and application value because of its high special efficiency, excellent structure, and good chemical resistance.

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