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

A high dielectric constant and polyurethane technology, applied in the field of high dielectric constant flexible polyurethane and its self-repair, can solve the problems of transparent polymers losing high transparency, unable to meet the touch screen conditions, and polymer materials that have not been reported. , to achieve the effect of reversible self-healing, remarkable repairing effect, and outstanding bending ability

Active Publication Date: 2019-05-21
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 screen cannot be met
[0005] On the other hand, polymer materials will inevitably be subjected to external forces such as scratches and impacts during use, resulting in degradation or failure of device performance. High dielectric materials have important application value
However, so far, polymer materials with such comprehensive properties have not been reported

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041](1) At room temperature, mix 100g of hydroxyl-terminated polyalkylene carbonate diol (molecular weight: 2000), 67g of isophorone diisocyanate, 31g of 2,2'-dithiodiethanol, and 0.02g of dilauric acid Dibutyltin and 500 g of dichloromethane were mixed; then the temperature was raised to 55° C., and the temperature was kept for 1 hour to obtain an isocyanate-terminated oligomer solution, which was designated as solution B.

[0042] (2) At room temperature, add 4g of trimethylolpropane, 20g of lithium bistrifluoromethanesulfonimide and 20g of 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt to solution B, Then react at a temperature of 60°C for 1h; then pour it into a mold, dry, and form a film to obtain a colorless and transparent flexible polyurethane film with high dielectric constant. Its infrared spectrum, thermal weight loss curve, ultraviolet-visible spectrum, fold Digital photographs before and after and after blower heating, tensile stress-strain curves...

Embodiment 2

[0063] (1) At room temperature, 100g of hydroxyl-terminated polyalkylene carbonate diol (molecular weight: 2000), 50g of hexamethylene diisocyanate, 23g of 2,2'-dithiodiethanol, 0.01g of Dibutyltin dilaurate, 500g of dichloromethane and 500g of chloroform were mixed; then the temperature was raised to 60°C and then kept for 0.5h to obtain an isocyanate-terminated oligomer solution, which was designated as solution D.

[0064] (2) At room temperature, add 9g of trimethylolpropane, 10g of lithium bistrifluoromethanesulfonimide and 40g of 1-ethyl-3-methylimidazole bistrifluoromethanesulfonyl to solution D imide salt, and then react at a temperature of 60° C. for 1 hour; then pour it into a mold and dry it to obtain a colorless and transparent flexible polyurethane film with high dielectric constant.

[0065] (3) The self-healing method of the colorless, transparent, highly flexible and high-dielectric polyurethane composite material is: self-healing method after fracture. Fully ...

Embodiment 3

[0067] (1) At room temperature, 100g of hydroxyl-terminated polyalkylene carbonate diol (molecular weight: 2000), 105g of cyclohexylmethane diisocyanate, 35g of 2,2'-dithiodiethanol, and 0.03g of dithiol Dibutyltin laurate, 300g of dichloromethane and 300g of 1,2 dichloroethane were mixed; then the temperature was raised to 60°C and then kept for 1 hour to obtain an isocyanate-terminated oligomer solution, which was designated as solution E.

[0068](2) At room temperature, add 11g of trimethylolpropane, 40g of lithium bistrifluoromethanesulfonimide and 30g of 1-ethyl-3-methylimidazole bistrifluoromethanesulfonyl to solution E imide salt, and then react at a temperature of 40° C. for 1 hour; then pour it into a mold and dry it to obtain a colorless and transparent flexible polyurethane film with high dielectric constant.

[0069] (3) The self-healing method of the colorless, transparent, highly flexible and high-dielectric polyurethane composite material is: self-healing metho...

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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 ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/32C08G18/12C08J5/18C08L75/04
CPCC08G18/12C08G18/6677C08G18/44C08G18/3855C08J5/18C08J2375/04C08G18/3206
Inventor 梁国正李旦一顾嫒娟袁莉
Owner SUZHOU UNIV
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