Stimuli-responsive yarn with asymmetric structure and its preparation method and application
An asymmetric structure, stimuli-responsive technology, applied in the direction of yarn, filament/thread forming, textile and papermaking, etc., can solve the problems of recovery hysteresis, sensor hysteresis, volatilization time, etc., to prevent fabric shrinkage, shape recovery drive Strong strength and fast recovery
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[0035] A method for preparing the above-mentioned asymmetric structure stimuli-responsive yarn, comprising the following steps:
[0036] S1. Prepare an asymmetric structure two-component side-by-side composite fiber, one of which includes a hydrophilic polymer matrix and a photothermal material; the other includes a hydrophobic polymer matrix and a conductive material;
[0037] S2. Twisting the asymmetric structure two-component side-by-side composite fiber into a yarn with a twist of 100-2000 twists / 10cm, and then performing heat setting treatment to obtain the asymmetric structure stimulus-responsive yarn.
[0038] In step S1, the asymmetric structure two-component side-by-side composite fiber is prepared by wet spinning; the mass concentration of the spinning solution is 10%-30%, the extrusion speed is 1-80m / min, and the drawing speed 1-300m / min. According to the different spinning solutions, the coagulation bath can choose one phase or a mixed solution of several phases i...
Embodiment 1
[0045] A stimuli-responsive yarn with an asymmetric structure prepared by the following steps:
[0046] S1. Preparation of two-component side-by-side composite fibers with asymmetric structure
[0047] Superhydrophilic nylon 6 and melanin are mixed to prepare spinning solution, the content of superhydrophilic nylon 6 is 20wt%, and the content of melanin is 5wt%;
[0048] Conventional nylon 6 and graphene are formulated into concentrated spinning solution, the content of conventional nylon 6 is 20wt%, and the content of graphene is 5wt%;
[0049] The above two spinning solutions are subjected to two-component side-by-side compound wet spinning, the extrusion speed is 40m / min, the drawing speed is 150m / min, and the coagulation bath is a mixed solution of water and ethanol to obtain an asymmetric structure of two components Side-by-side composite fibers;
[0050] S2. Twisting the asymmetric structure two-component side-by-side composite fiber into a yarn with a twist of 300 twi...
Embodiment 2-5
[0054] An asymmetric structure stimulus-responsive yarn, compared with Example 1, the difference is that in step S2, the twist of the yarn is shown in Table 1. Others are substantially the same as in Embodiment 1, and will not be repeated here. The length recovery rate after repeated 10 times of wet stimulation below refers to the ratio of the restored length of the yarn to the original length.
[0055] Twist and wet, thermal stimulation performance data of table 1 embodiment 2-5
[0056]
[0057] It can be seen from Table 1 that as the twist increases, the length shrinkage rate becomes larger, and the length recovery first increases and then decreases after repeated 10 times of wet stimulation, indicating that too large or too small twist is not conducive to the improvement of the hot and humid stimulus response life. improve. The recovery time of the yarn with asymmetric structure is shorter and the repeatability is better; and the shrinkage rate under thermal stimulati...
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