A kind of high temperature resistant semi-aromatic polyamide superfine fiber and its preparation method
A semi-aromatic and ultra-fine fiber technology, which is applied in the field of polyamide fibers, can solve problems such as high-temperature resistant semi-aromatic polyamide ultra-fine fibers, etc., and achieve excellent thermal stability, morphological stability, and good chemical stability. , the effect of excellent high temperature resistance
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Embodiment 1
[0034] (1) After drying 75wt% PA7T slices in a vacuum drum at 130°C for 5 hours, set aside;
[0035] (2) After blending 75wt% PA7T, 24wt% polypropylene and 1wt% polypropylene grafted maleic anhydride for 1min, melt through a screw extruder; spinning, the spinning temperature is 330°C, spinning The speed is 800m / min, and then cooled to room temperature by circular air blowing, and the nozzle is oiled to obtain the as-spun fiber; the as-spun fiber is drawn twice, wound and formed to obtain the blended fiber;
[0036] (3) Dissolve the blended fiber in step (2) in a xylene solvent at 95°C for 0.5h, and remove the polyolefin in the fiber by the solvent to obtain an ultrafine fiber with a single fiber fineness of 0.001dtex , the fiber diameter is uniform and the length is 10mm.
Embodiment 2
[0038] (1) After drying 65wt% PA16T slices in a vacuum drum at 100°C for 16 hours, set aside;
[0039] (2) After blending 65wt% of PA16T, 32wt% polypropylene and 3wt% polypropylene grafted maleic anhydride for 3min, melt through screw extruder, melting temperature; spinning, spinning temperature is 280 ℃, the spinning speed is 4000m / min, and then cooled to room temperature by circular air blowing, and the nozzle is oiled to obtain the as-spun fiber; the as-spun fiber is drawn 5 times, wound and formed to obtain the blended fiber;
[0040] (3) dissolving the blended fiber in step (2) in a xylene solvent at 65° C. for 5 h, and removing the polyolefin in the fiber by the solvent to obtain an ultrafine fiber whose single fiber has a fineness of 0.01 dtex. The fibers were uniform in diameter and 15 mm in length.
Embodiment 3
[0042] (1) After drying 50wt% PA9I slices in a vacuum drum at 120°C for 10h, set aside;
[0043] (2) After blending 50wt% PA9I, 45wt% polyethylene and 5wt% polyethylene grafted maleic anhydride for 5min, melt through a screw extruder; spinning, spinning temperature is 310°C, spinning The speed is 2000m / min, and then cooled to room temperature by circular air blowing, and the nozzle is oiled to obtain the as-spun fiber; the as-spun fiber is drawn 3 times, wound and formed to obtain the blended fiber;
[0044] (3) Dissolve the blended fiber in step (2) in a xylene solvent at 80°C for 2.5 hours, and remove the polyolefin in the fiber by the solvent to obtain an ultrafine fiber with a single fiber fineness of 0.005dtex , the fiber diameter is uniform and the length is 15mm.
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Abstract
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