Polythioether maleimide optical resin and preparation method thereof

A technology of maleimide and dimethylmaleimide, applied to polythioether maleimide optical resin with high refractive index and high transparency and its preparation, polythioether maleimide In the field of optical resin and its preparation, it can solve the problems of little research on polyimide resin, achieve the effect of controllable product structure, improved mechanical properties, and easy access to raw materials

CN110105574AActive Publication Date: 2019-08-09SHENZHEN POLYTECHNIC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-08-09

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Abstract

The invention provides a polythioether maleimide optical resin and a preparation method thereof. The molecular structural formula of the polythioether maleimide optical resin is shown as formula (1).The preparation method includes: taking methyl maleic anhydride as the starting raw material to obtain a bismethylmaleimide monomer, and then introducing mercapto into the methyl bismaleimide monomerby mercapto-alkenyl click chemistry process, thus obtaining the polythioether maleimide optical resin. According to the technical scheme, the bismaleimide polyimide resin is medium and low temperaturecurable, colorless and transparent, also has the advantages of high refractive index and high thermal stability, and can be used as LED packaging optical resin.
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Description

technical field

[0001] The invention belongs to the technical field of polymer materials, in particular to a polythioether maleimide optical resin and a preparation method thereof, in particular to a polythioether maleimide optical resin with high refractive index and high transparency and its preparation method. Background technique

[0002] Light-emitting diodes (LEDs) have attracted widespread attention as a new generation of solid-state light sources. Since the chip of the LED has a high refractive index (about 2.2), there is a big difference between the refractive index of the LED package resin and the total reflection of light at the interface, and the light extraction efficiency is not high. At present, the refractive index of the silicone encapsulating resin of LED is only 1.4-1.5, which is quite different from the refractive index of the chip, resulting in a low light extraction efficiency, which is only 10% of the theoretical value.

[0003] According to the Lore...

Examples

Embodiment 1

[0044] A kind of polythioether maleimide optical resin, it adopts following steps to prepare:

[0045] To a solution of 4,4'-diaminodiphenylsulfone (DDS, 5mmol) in glacial acetic acid (100ml) was added dropwise methylmaleic anhydride (10.5mmol) in glacial acetic acid (50ml), and stirred at room temperature for 1h. The reaction mixture was then heated to reflux for 4h, concentrated under reduced pressure and cooled to 200ml of water. The formed solid was filtered and washed with 100 ml of 3% Na 2 CO 3The solution was washed, then washed with deionized water, and dried in a vacuum oven at 70°C for 12 hours to obtain a white solid, which was recrystallized from acetone to obtain 4,4'-diaminodiphenylsulfone dimethylmaleimide (DDS-BCI).

[0046] Take the synthesized 4,4'-diaminodiphenylsulfone dimethylmaleimide monomer and dimercaptodiphenyl sulfide to react, add m-cresol solvent to dissolve, add initiator, and stir at 30°C 4 hours. Wherein, the initiator is dibenzoyl peroxide...