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It refers to a plastic optical plastic material used as an optical medium. It is mainly used in large-volume optical instruments for the manufacture of optical substrates, lenses, contact lenses, organic optical fibers, etc. Optical plastics that have been used mainly include transparent plastics. At present, the development of the optical plastics industry has been paid more and more attention to become a "potential stock" in the future. Let us look at the future development direction of optical plastics, mainly the following five points:
First, improve the heat resistance temperature
At present, the heat resistance temperature of plastic raw material lenses is generally low, especially the most commonly used PMMA heat distortion temperature gas is 75~80 °C, which limits the application range. If the heat distortion temperature can reach 100~150 °C, many fields Plastic lenses can be applied;
Second, improve moisture resistance
Optical plastic materials generally have water absorption, which greatly affects optical properties. Therefore, it is extremely important to reduce water absorption.
Third, reduce birefringence
The polymer material family has birefringence problems, which are related to the molar amount, morphology, density, molecular orientation during molding, and internal stress. Generally, optical materials require no birefringence, so it is expected to develop a plastic with small birefringence.
Fourth, the development of high refractive index plastic materials
The refractive index of the currently available optical plastic materials is less than 1,6, the variety is small, and the choice is small, and the larger the refractive index of the lens, the easier the aberration correction is, and the better the performance of the lens is. Research on high refractive index optical plastics has at least 1.6.
V. Research on molding process of plastic raw materials
Different optical plastic materials, molding lenses, aspherical methods are not the same, especially the shaping of prisms, almost no research. The study of high-precision parts is almost blank. Therefore, in the future, research on molding processes should be vigorously carried out.
The plasticity of plastics is unmatched by glass. Some of the beautiful geometric shapes are almost impossible for glass to achieve continuous scale production in recent years. Moreover, due to some of the characteristics of the plastic itself, although the hardness is low and the wear resistance is not as good as the glass, the plastic can be designed into a more rigid geometry and the hardness is improved by the surface coating.