Antibacterial high-temperature-aging-resistant polyimide film and preparation method thereof
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A technology of polyimide film and high temperature resistance, which is applied in the field of polyimide film to achieve the effect of improving toughness, long-lasting antibacterial performance, and excellent long-term antibacterial performance
Pending Publication Date: 2020-11-24
凯正包装科技(广东)有限公司 +1
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[0004] The object of the present invention is to provide a kind of polyimide film of antibacterial high te
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[0031] Example 1
[0032] A preparation method of antibacterial, high temperature and aging resistant polyimide film includes the following steps:
[0033] (1) Under the protection of argon, first add 4,4'-oxydiphenylamine and 4,4'-diaminodiphenyl ether solvents, after ultrasonic dissolution is complete, then add pyromellitic dianhydride and dimethylol Hydantoin, after 15 hours of reaction, air bubbles are extracted in vacuum to obtain polyamic acid containing antibacterial functional monomer; wherein the content of dimethylol hydantoin is 1% of the total mass of the antibacterial, high temperature and aging resistant polyimide film.
[0034] (2) Under argon protection, add silica and activate it at 280°C for 12 hours under reflux of anhydrous toluene; use tridecafluorooctyltriethoxysilane to perform surface treatment on the activated silica;
[0035] (3) Add maleic anhydride and the surface-treated silica obtained in step (2) to the polyamic acid containing antibacterial monomers obt...
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[0037] Example 2
[0038] A preparation method of antibacterial, high temperature and aging resistant polyimide film includes the following steps:
[0039] (1) Under the protection of argon, first add 4,4'-oxydiphenylamine and 4,4'-diaminodiphenyl ether solvents, after ultrasonic dissolution is complete, then add pyromellitic dianhydride and dimethylol Hydantoin, after 15 hours of reaction, air bubbles are extracted in vacuum to obtain polyamic acid containing antibacterial functional monomer; wherein the content of dimethylol hydantoin is 1% of the total mass of the antibacterial, high temperature and aging resistant polyimide film.
[0040] (2) Under argon protection, add silica and activate it at 280°C for 12 hours under reflux of anhydrous toluene; use tridecafluorooctyltriethoxysilane to perform surface treatment on the activated silica; The silica is nano-silica with a particle size of 100-300nm.
[0041] (3) Add maleic anhydride and the surface-treated silica obtained in step ...
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Abstract
The invention relates to an antibacterial high-temperature-aging-resistant polyimide film and a preparation method thereof. The method comprises the following steps: (1) adding diamine and a solvent,then adding dianhydride and an antibacterial functional monomer, and carrying out reaction for 10-24h so as to obtain polyamide acid containing the antibacterial functional monomer; (2) activating SiO2 at 250-280 DEG C under the reflux of anhydrous toluene, and then, carrying out surface treatment by using perfluorooctyl triethoxysilane; (3) adding maleic anhydride and SiO2 subjected to the surface treatment into polyamide acid, performing stirring for 2-3 hours, and performing gradient heating and thermal imidization to obtain polyimide; (4) adding nano TiO2 into a polyvinyl alcohol colloidalsolution with a concentration of 10%, and performing uniform stirring; (5) uniformly mixing a product obtained in the step (3) and a mixture obtained in the step (4), and performing granulating; and(6) performing film blowing to form the polyimide film. According to the invention, the SiO2, the TiO2 and the antibacterial functional monomers are added into the polyimide, so that the obtained polyimide film has excellent high temperature aging resistance and long-acting antibacterial property, and is suitable for food packaging under African hot weather conditions.
Description
technical field [0001] The invention belongs to the field of polyimide films, in particular to an antibacterial, high-temperature and aging-resistant polyimide film and a preparation method thereof. Background technique [0002] With the change of people's living habits, more and more fast-moving foods have appeared, and these fast-moving foods will use food packaging films during storage and transportation. At present, the packaging films used in the market are mainly polyethylene films. However, under the action of the atmosphere, sunlight and oxygen, polyethylene is prone to aging caused by photooxidation, thermal oxidation, and ozone decomposition, discoloration, cracking, brittleness or pulverization, and loss of mechanical properties, especially in the long-term Under the action of ultraviolet rays, the surface of polyethylene film will appear discoloration and other phenomena, which will accelerate the aging of the film and thus affect the service life. Moreover, th...
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