Colorless clear flexible polyurethane having high dielectric constant and self-repairing method thereof

Abstract

Colorless clear flexible polyurethane having a high dielectric constant and a self-repairing method thereof are disclosed. The polyurethane is prepared by mixing polyalkylenecarbonate diol end-cappedwith hydroxy, diisocyanate, 2,2'-dithiobisethanol, dibutyltin dilaurate and chloralkane; reacting the mixture to obtain an oligomer solution end-capped with isocyanate; adding a polyol crosslinking agent, lithium bis(trifluoromethanesulfonyl)imide and 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide into the oligomer solution; reacting the mixture at 40-60 DEG C for 0.5-1.5 h; and removing the solvent after the reaction is finished. Self-repairing of the colorless clear flexible polyurethane damaged is completed by fixing and tightly attaching damaged surfaces of the polyurethane with a clamp, and then heating the damaged surfaces at 80-150 DEG C for 0.5-2 h. The provided polyurethane has high tensile strength, high elongation at break, outstanding bending capability and a high dielectric constant.

Description

technical field [0001] The invention relates to a polyurethane (polyurethane film) and a preparation method thereof, in particular to a colorless and transparent flexible polyurethane with a high dielectric constant and a self-repairing method thereof. Background technique [0002] Flexibility is the current development trend of electronic devices. Electronic devices are often multi-layer structures, and glass is widely used in the preparation of transparent cover plates for electronic devices due to its outstanding mechanical properties and colorless and transparent characteristics. However, the high rigidity of glass results in very limited bendability of the device. Although the bending ability of glass can be improved by reducing the thickness, the height range is very limited and the glass is more vulnerable to damage, which greatly hinders the development of flexible electronic devices. [0003] In the face of the general trend of flexible electronic devices, people ...

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Problems solved by technology

[0004] At present, the basic method of preparing high dielectric constant polymer materials is to add conductors or high dielectric constant ceramics to polymers. However, the addition of functional bodies often causes transparent polymers to lose their high transparency and change from colorless to colored. Therefore, the conditions for preparing a touch...

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