Modified four-feet needle-shaped zinc oxide crystal whisker and preparation method thereof

Abstract

The invention discloses a modified tetragonal needle zinc oxide crystal whisker and a preparation method thereof, wherein, the preparation method comprises the following steps of: dispersing the tetragonal needle zinc oxide crystal whisker into deionized water, adding sodium silicate hydrate, stirring at 40 to 80 DEG C to enable the solution to be uniformly dispersed, adding ethyl acetate, stirring for 1 to 10h, then filtering a product, washing, and drying to the constant weight; mixing and stirring the received product with 95 percent ethanol, adding organic siloxane, stirring at 30 to 60 DEG C for 0.5 to 3h, filtering, washing, and drying to the constant weight. The invention has the surface of the tetragonal needle zinc oxide crystal whisker covered by nano silicon dioxide so as to improve the interface bonding between the crystal whisker and polymers, and generates the nano silicon dioxide on the surface of the crystal whisker to realize the evenness of the degree of supersaturation and acquire a comparative complete coverage. The modified tetragonal needle zinc oxide crystal whisker has the advantages of simple technology, moderate condition and easy execution.

Description

technical field [0001] The invention relates to a crystal whisker and a preparation method thereof, in particular to a modified four-legged needle-shaped zinc oxide crystal whisker and a preparation method thereof. Background technique [0002] Whiskers are made from crystallizable substances in inorganic substances (metals, oxides, carbides, halides, nitrides, inorganic salts, graphite, etc.) and organic polymers, and grow in the form of single crystals through artificial control. The shape is similar to that of short fibers, while the size of whisker-like single crystals is much smaller than that of short fibers. Since the atomic structure of the whisker is highly ordered during crystallization, so that there are few defects in the whisker, its strength is close to the theoretical strength of the valence bond between the atoms of the material, far exceeding the currently widely used various enhancers. [0003] Four-legged needle-shaped zinc oxide whiskers are white loose ...

AI Technical Summary

Problems solved by technology

At present, most researchers at home and abroad usually use the glass fiber treatment method to directly treat the whiskers with a coupling agent; however, because the atomic structure of the whiskers is highly ordered, there are few internal defects, making it difficult to combine with other materials. The group reacts to form chemical bonds, and its surface is smooth and has poor wettability. Therefore, the improvement effect of direct treatment with coupling agent is not significant, resulting in weaker combination of whiskers and polymer matrix, which affects its performance.

[0005] It is reported in the literature that some people use the hybridization reaction of sodium silicate and dilute sulfuric acid to obtain the coating of nano-silica on whiskers such as potassium titanate, but there is no report on the treatment of zinc oxide.

In addition, due to the instantaneous completion of the reaction between sodium silicate and dilute sulfuric acid, it is easy to cause local supersaturation in the system, which easily leads to incomplete coating of the generated nano-silica

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