Preparation method of waterborne micro porous waterproof and moisture permeable film

Abstract

The invention discloses a preparation method of a waterborne micro porous waterproof and moisture permeable film. The preparation method comprises the following steps that S1, materials are prepared,the raw materials in parts by weight are weighed in proportion: 100 parts of a waterborne polyurethane emulsion, 5-8 parts of methylbenzene, 10-20 parts of ammonium hydroxide, 2-3 parts of a water-proofing agent and 65-70 parts of water; S2, mixing is conducted, the raw materials weighed in step 1 are mixed to obtain a colloidal mixture; S3, coating is conducted, release paper is evenly coated with the mixture; and step 4 is conducted before the mixture is in a solidified state after coating; S4, drying is conducted, the release paper coated with the mixture is sent into an oven for drying, temperatures with at least three levels are set in the oven, the first-level temperature is 78 DEG C to 80 DEG C, the second-level temperature is 100 DEG C to 120 DEG C, and the third-level temperatureis 150 DEG C to 160 DEG C; and S5, stripping is conducted, after drying, the release paper is stripped to obtain the waterborne micro porous waterproof and moisture permeable film. A film product prepared by the preparation method has the functions of moisture permeability and anti water drop, water dropping on the film surface does not expand, and meanwhile the micro porous waterproof and moisture permeable film has excellent elasticity.

Description

technical field [0001] The invention relates to the textile field, in particular to a preparation method of a water-based microporous waterproof and moisture-permeable membrane. Background technique [0002] Microporous moisture-permeable membrane is a special waterproof and moisture-permeable membrane that is different from hydrophilic dry-process moisture-permeable coatings. Its particularity lies in that it relies on the formation of a large number of micropores during film formation. These pores are less than 10um and can prevent Small water droplets (average diameter 100um) infiltrate to obtain water pressure resistance, but allow water vapor (average diameter 0.0004um) to pass through freely, thereby obtaining moisture permeability. The microporous really solves the heat dissipation and air permeability when the human body exercises a lot, and it is also waterproof performance. The fabric made of microporous moisture-permeable membrane does not swell when exposed to w...

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Problems solved by technology

[0005] DMF is dimethyl fumarate, also known as: (E) dimethyl 2-butenedioate. It is a stable, highly volatile and odorless compound. This chemical substance belongs to biopesticides, but not in The (EC) No 1451 / 2007 standard is included in the list of pesticides authorized by the European Union. After human contact, inhalation or ingestion, it will cause irritation or even damage to the skin, eyes, mucous membranes and upper respiratory tract. Therefore, most environmental protection regulations exist on it. The content is limited, so the above two production processes, in the process of forming holes through DMF, some DMF remains in the holes and exists in the prepared film, which does not meet the requirements of some consumer markets for current products

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