Photocured organosilicone elastomer and preparation method and application thereof

Abstract

The invention discloses a photocured organosilicone elastomer and a preparation method thereof. The photocured organosilicone elastomer is prepared from, by weight, 50-80 parts of vinyl methyl phenyl polysiloxane, 10-30 parts of mercaptopropyl methyl phenyl polysiloxane, 5-20 parts of mercaptopropyl silicon resin, 0-3 parts of photoinitiator and 0.1-1 part of auxiliary. Vinyl methyl phenyl polysiloxane, mercaptopropyl methyl phenyl polysiloxane, mercaptopropyl silicon resin and the photoinitiator are used as raw materials and mixed and stirred to be uniform, and the photocured organosilicone elastomer is prepared. By adjusting the quantity ratio of methyl segmers and phenyl segmers in polysiloxane and introducing mercaptopropyl silicon resin to serve as a macromolecular cross-linking agent, photocured organosilicone elastomers different in toughness, mechanical strength and refractive index can be prepared, and rapid curing molding is realized within 5-20 s under ultraviolet illumination; the process is simple, efficient and environmentally friendly and saves energy; the photocured organosilicone elastomer can be applied to the fields of electronic packaging materials, optical materials, 3D printing materials and the like.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and more specifically relates to a photocurable silicone elastomer and its preparation method and application. Background technique [0002] At present, photocurable silicone elastomers are mainly cation-cured epoxy groups or free-radical-curable acrylate groups in polysiloxane molecular segments, or photoactive Pt catalyzed reactions, Or mercapto-ene click reaction to prepare. In CN104559196 and CN105131613, optically active Pt catalysts are used to prepare addition-type photocurable silicone rubber, but because the Pt catalyst is expensive, the curing speed is relatively slow, and it is easy to be poisoned and deactivated, so it is not conducive to wide application and production. CN105331115 and CN103554500 use acryloxy-containing organosilicon prepolymers to light-cure transparent silicone resin composite materials, and CN104004491 uses acrylated organopolysilanes to pre...

AI Technical Summary

Problems solved by technology

The light-cured elastomer prepared by mercapto-ene (Thiol-ene) click reaction has poor mechanical properties, poor universality, and forms a light-cured silicone gel with low strength, such as CN102869727

In order to improve the mechanical properties of silicone elastomers, it is usually necessary to add inorganic fillers such as nano-silica, such as CN104448838, but the introduction of inorganic fillers will affect the optical properties of the material, especially the application field of optical materials

It can be seen that photocurable silicone elastomers use expensive catalysts in the curing process, and are prone to poisoning and deactivation; oxygen inhibition occurs, causing the material to shrink and deform; strong corrosion; transparent materials have poor mechanical properties and other shortcomings, which limit Wide application of materials

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