Method for coating epoxy resin layer on surface of microsphere with critical carbon dioxide

Abstract

The invention provides a method for coating the surfaces of microspheres with an epoxy resin layer by virtue of supercritical carbon dioxide. According to the method, based on the characteristics of supercritical carbon dioxide which is an all-purpose solvent, the surfaces of PS microspheres are coated with an epoxy resin layer; the, a solvent in epoxy resin is extracted out by using supercritical carbon dioxide so as to form an adhesive layer on the surfaces of the PS microspheres; moreover, when gas is released, the microspheres are suspended and roll continuously in a gas flow so that the epoxy resin uniformly coats the surfaces of the microspheres; after gas is completely released, the microspheres are collected to obtain microspheres well coated with the epoxy resin; after being treated, the PS microspheres have smooth surfaces and fixed particle diameter just like original spheres; when an edge sealing adhesive is cured, the microspheres are synchronously cured and adhered to a glass plate or PET, thus achieving the aim of fixing the microspheres; the phenomenon of image instability because of spacing deviation caused when an external force acts between two plates of an LCD can be reduced and the quality of the LCD can be improved. The method is simple, easy to implement, low in cost and good in use effect.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to a method for coating an epoxy resin layer on the surface of microspheres with critical carbon dioxide. Background technique [0002] When making existing liquid crystal displays, liquid crystal is injected between two glass plates or PET plates coated with ITO (indium tin oxide), and its surroundings are coated with PET glue. The two plates are bonded and sprayed with PS microspheres of a certain particle size in the middle as a spacer. Materials, especially PET for flexible liquid crystal displays, are also made by the same method, and the microspheres between them are easy to slide and accumulate. The distance between the two plates must be consistent during injection. Usually PS microspheres with the same particle size are used to control the distance between the two plates when preparing liquid crystal displays. The surface of the currently used PS balls has not be...

AI Technical Summary

Problems solved by technology

The surface of the currently used PS balls has not been treated. A layer of PS microspheres has a smooth surface. When the microspheres are applied between the glass plates, they are easy to slide under the action of external force. After the microspheres slide and accumulate, the deviation of the distance between the glass plates will be caused.

Once there is a deviation in the distance between the two plates, the direction of the liquid crystal molecules is not reversed according to the original electrical performance, which will cause a series of image distortions such as blurred screens.