Preparation method of cross-linked polystyrene with high light transmittance

Abstract

The invention discloses a preparation method of cross-linked polystyrene with high light transmittance, and belongs to the field of cross-linking polymerization of polymers. The method comprises steps as follows: 1), a polystyrene solution is prepared and uniformly mixed with divinyl benzene in a certain proportion; 2), the mixed solution is subjected to freezing layer by layer and high-energy electron irradiation layer by layer; 3), later forming of a cross-linked polystyrene material is completed through a temperature control process. The method has the main characteristics as follows: a product is pure and transparent and doesn't have defects of bubbles, impurities and the like; 2) the cross-linking polymerization process is performed at an ultralow temperature, and the product qualification ratio is high; 3), the product has excellent light transmittance, stable dielectric property, higher processing mechanical property and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of cross-linked polystyrene with high light transmittance. Background technique [0002] Cross-linked polystyrene is a non-toxic, odorless, colorless and transparent thermosetting plastic with low density, good dimensional stability, easy processing, high dielectric strength, strong anti-radiation aging ability, and light transmittance as high as 90%, so it can be Widely used in optical lenses, high-voltage equipment and other fields, it plays the role of optical transmission, electrical insulation and structural support. [0003] At present, there are mainly two methods for the preparation of large-scale cross-linked polystyrene materials in China. One is the method of programmed temperature-controlled bulk polymerization proposed by the inventor of this patent. In this method, styrene and initiator are pre-polymerized at high temperature, and th...

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Problems solved by technology

[0004] Although the two preparation technologies are relatively mature, the polymerization process still has the following defects: First, in the cross-linking polymerization stage of the two processes, the volume shrinkage of the reaction system is inevitable, and the distribution of shrinkage points is uneven, which will lead to the formation of the material. The density is not high, the distribution of the network structure is uneven, and defects such as bubbles and cracks may even occur; the second is that high-temperature initiators are used in the two processes, and their decomposition products will remain in the material system, resulting in limited purity of the product material

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