Breathable film and method for producing the same
A manufacturing method and air permeability technology, which is applied in the direction of electrical components, textiles, papermaking, structural parts, etc., can solve the problems of air permeability damage and achieve the effect of uniform air permeability
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Embodiment 1
[0087] The first process:
[0088] Prepare plain weave glass fiber fabric (mass per unit area 24g / m 2 , thickness 20μm, glass fiber diameter φ4.1μm×100 bales, air permeability less than 1 second / 100cc, after fiber opening treatment and silane coupling treatment). The micrographs of the glass fiber fabric surface are shown in figure 1 . On the other hand, as a modified polyolefin-based resin for impregnation, an aqueous emulsion of a modified polyolefin-based resin, namely Unitika Co., Ltd. "arrobase" (trade name) No. SB-1200 was prepared. Added to the aqueous emulsion An oxazoline-based crosslinking agent (WS-700 manufactured by Nippon Catalyst Co., Ltd.) was stirred to prepare an impregnation liquid as a uniform dispersion. here, The compounding quantity of an oxazoline crosslinking agent was 5.9 mass % with respect to a modified polyolefin resin (solid content).
[0089] The second process:
[0090] The above-mentioned glass fiber fabric is dipped in the above-menti...
Embodiment 2
[0094] In the second step, except that the impregnation amount of the binder resin was 17% by mass, it was carried out in the same manner as in Example 1, and an air-permeable film was obtained. The air permeability of the glass fiber fabric obtained in the second step exceeded 2000 seconds / 100cc, and it was confirmed that the air permeability was lost. The air permeability of the air permeable film obtained in the third step was 256 seconds / 100 cc, and the air permeability spot was 17.5%, and good and uniform air permeability was confirmed. In addition, the heating shape retention rate of the air permeable film was as good as 98.8%. The total impregnation amount of the binder resin and the crosslinking agent in the finally obtained air-permeable film was 17% by mass based on the glass fiber fabric. As a result of observing the surface covering state of the air-permeable film, the entire surface was covered with the binder resin.
Embodiment 3
[0096] In the second step, except that the impregnation amount of the binder resin was 23% by mass, it was carried out in the same manner as in Example 1, and an air-permeable film was obtained. The air permeability of the glass fiber fabric obtained in the second step exceeded 2000 sec / 100cc, and it was confirmed that the air permeability was lost. The air permeability of the air permeable film obtained in the third step was 528 seconds / 100 cc, and the air permeability spot was 14.3%, and good and uniform air permeability was confirmed. In addition, the heating shape retention rate of the air permeable film was as good as 99.3%. The total impregnation amount of the binder resin and the crosslinking agent in the finally obtained air-permeable film was 23% by mass based on the glass fiber fabric. As a result of observing the surface covering state of the air-permeable film, the entire surface was covered with the binder resin.
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Abstract
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