A kind of preparation method of biaxially stretched polylactic acid fiber porous film
A polylactic acid fiber, two-way stretching technology, applied in the direction of fabric elongation, heating/cooling fabric, non-woven fabric, etc., to achieve the effect of smooth surface, controllable porosity and thickness, and good biodegradability
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[0025] A preparation method of a biaxially stretched polylactic acid fiber porous membrane is to prepare a polylactic acid nonwoven fabric fiber membrane from the prepared polylactic acid nonwoven fabric fiber web, first biaxially stretch, and secondly heat Rolling, the second biaxial stretching, the third hot rolling, and heat setting, wherein the polylactic acid non-woven fiber web used is prepared by the preparation process in the literature of the Chinese Patent Publication No. CN103726220A or CN101851830A.
[0026] The preparation method proceeds as follows:
[0027] a Polylactic acid non-woven fiber membrane preparation
[0028] The prepared polylactic acid fiber web is hot-rolled for the first time with a flat hot rolling mill or a bachelor hot rolling mill to obtain a uniform and dense polylactic acid non-woven fiber membrane, wherein the polylactic acid non-woven fiber membrane The thickness is 20-1000 μm; the first hot-rolling temperature is 80-105° C., the hot-roll...
Embodiment 1
[0040] a Polylactic acid non-woven fiber membrane preparation
[0041] The prepared polylactic acid fiber web is hot-rolled for the first time with a flat hot rolling mill or a bachelor hot rolling mill to obtain a uniform and dense polylactic acid non-woven fiber membrane, wherein the polylactic acid non-woven fiber web used is It is prepared by the preparation process in the literature with the Chinese Patent Publication No. CN103726220A. The thickness of the polylactic acid non-woven fiber membrane is 20 μm; the first hot rolling temperature is 80 ° C, the hot rolling pressure is 5 MPa, and the hot rolling The time is 1s.
[0042] b the first two-way stretch
[0043]The first hot-rolled polyester non-woven fiber membrane prepared in step a is preheated by hot air at a temperature of 60 ° C, and then the preheated polyphenylene sulfide fiber membrane is stretched at a temperature of 60 ° C. ℃ for the first biaxial stretching, the stretching method is longitudinal stretchin...
Embodiment 2
[0052] a Polylactic acid non-woven fiber membrane preparation
[0053] The prepared polylactic acid fiber web is hot-rolled for the first time with a flat hot rolling mill or a bachelor hot rolling mill to obtain a uniform and dense polylactic acid non-woven fiber membrane, wherein the polylactic acid non-woven fiber web used is It is prepared by the preparation process in the literature with the Chinese Patent Publication No. CN101851830A. The thickness of the polylactic acid non-woven fiber membrane is 20 μm; the first hot rolling temperature is 80 ° C, the hot rolling pressure is 5 MPa, and the hot rolling The time is 1s.
[0054] b the first two-way stretch
[0055] The first hot-rolled polyester non-woven fiber membrane prepared in step a is preheated by hot air at a temperature of 60 ° C, and then the preheated polyphenylene sulfide fiber membrane is stretched at a temperature of 60 ° C. ℃ for the first biaxial stretching, the stretching method is simultaneous longitud...
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Abstract
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