Manufacturing method of nuclear millipore membrane

Abstract

The invention provides a manufacturing method of a nuclear millipore membrane. The method is characterized by comprising the following steps of: (1) irradiating, i.e. irradiating a polymer membrane; (2) etching, i.e. etching the irradiated polymer membrane in an acid solution (or an alkali liquor) so as to form millipores; (3) coating for hole plugging, i.e. coating positions with no need for encrypted information on a polymer membrane to plug holes so as to form a millipore membrane with complete encrypted information. Compared with the prior art, the method of the invention has the advantages that: 1) after etching, positions with no need for encrypted information on a polymer membrane are coated with a high strength hole plugging coating to plug millipores in the positions, and the formed encrypted information of the millipore membrane is exempt from damage and good in integrity; 2) under the molecular force of the coating that filters into the millipores, the mechanical strength of the millipore membrane is increased; 3) gluing after etching reduces the rejection rate and is convenient for high speed manufacturing in subsequent processes, thus improving the production efficiency.

Description

technical field [0001] The invention relates to a production method of a nuclear microporous membrane. Background technique [0002] At present, nuclear microporous membranes are used for anti-counterfeiting and filtering purposes, and are popular in the market, especially for anti-counterfeiting. They cannot be imitated and are easily recognized by consumers. They are also the choice of high-end customers, so the market demand is growing rapidly. [0003] The production process of the nuclear microporous membrane is to bombard (irradiate) the polymer material membrane with the fission particles produced by the nuclear reactor or the high-energy particles produced by the tandem heavy ion accelerator, and damage its molecular chain, and the part of the damaged molecular chain will form Different from the acid-base properties of the raw materials, the damaged polymer chains after the radiation bombardment will be dissolved (etched) in the lye (or acid) to form a density of hun...

AI Technical Summary

Problems solved by technology

The production of nuclear microporous membranes by this method has the following disadvantages: 1) Since the glue is applied before etching, and a kind of anti-etching (acid and alkali resistant) glue is used, it is easy to anti-stick in the subsequent production process, so that no need to form The glue on the polymer film at the position of the microhole is stuck away, so that micropores appear at this position during the etching reaction, destroying the integrity of the encrypted information

2) The glue will adhere to the back of the polymer film, thereby blocking the micropores that constitute the encrypted information, and also destroying the integrity of the encrypted information

3) Since the glue that does not need to form the position of the encrypted information is stuck away, micropores appear, thereby increasing the number of micropores, reducing the mechanical strength of the film, making it brittle, and the scrap rate is high, increasing production difficulty and affecting production efficiency

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