Electret film, preparation method, application, and air purification device
An electret and thin film technology, applied in the field of electret materials and preparation, can solve the problems of low charge density and storage stability, charge failure, etc., achieve high charge density and electrostatic voltage, not easy to decay, and improve performance.
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[0116] In a second aspect, in some embodiments, a method for preparing an electret film is provided, comprising the following steps:
[0117] making a base film with a mixture comprising a first polymer and an electret masterbatch;
[0118] The base film is subjected to electret treatment to obtain an electret film.
[0119] The preparation method of the thin film material has the characteristics of simple process operation, convenient manipulation, low cost and suitable for mass production.
[0120] Specifically, after the electret masterbatch and the polymer material are uniformly mixed in a certain proportion, a base film is obtained by melt extrusion, and then the base film is subjected to surface treatment and corona electret to obtain a high-performance electret Membrane air filter material. The electret film air filter material prepared by the invention has high charge density and electrostatic voltage, and can generate a lasting and stable electrostatic field without...
Example Embodiment
[0146] Example 1
[0147] 1. An electret film, mainly prepared from the following raw materials:
[0148] Polypropylene and electret masterbatch, wherein the weight content of electret masterbatch is 5%;
[0149] The electret masterbatch includes the following components by weight: 2.5% nanometer active titanium dioxide, 2.5% nanometer active calcium carbonate, 5% nanometer tourmaline, 2.5% substituted aryl carboxylate aluminum salt, 5% hindered amine, 5% phosphite , 5% pentaerythritol ester and 72.5% polypropylene.
[0150] 2. The preparation method of electret film, comprising the following steps:
[0151] 2.5% nano-active titanium dioxide, 2.5% nano-active calcium carbonate, 5% nano-tourmaline, 2.5% substituted aryl carboxylate aluminum salt, 5% hindered amine, 5% phosphite, 5% pentaerythritol ester and 72.5% polypropylene Add it to a high-speed mixing mixer, mix and disperse for 20-30 minutes, extrude and granulate with a twin-screw extruder, and the extrusion temperatu...
Example Embodiment
[0157] Example 2
[0158] The difference between this example and Example 1 is that the weight content of the electret masterbatch is 2%; the rest are the same as Example 1.
[0159] In this embodiment, the test results show that the resistance is 0.1 Pa and the filtration efficiency is 32.962%.
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