| CPC D01D 1/02 (2013.01) [B01F 31/401 (2022.01); B01F 35/123 (2022.01); B01F 35/323 (2022.01); B29B 7/421 (2013.01); D01D 1/065 (2013.01); D01D 1/103 (2013.01); D01D 1/106 (2013.01); D01D 10/06 (2013.01); D01F 1/02 (2013.01); D01F 4/00 (2013.01); D02J 1/22 (2013.01); C08B 37/003 (2013.01); D10B 2211/01 (2013.01); D10B 2331/14 (2013.01)] | 4 Claims |
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1. A method for preparing a pure chitosan fiber, comprising the following steps:
S1, preparing an acetic acid solution, wherein the acetic acid solution is prepared from water and acetic acid, with an acetic acid mass ratio of 1 w %-5 w %;
S2, preparing a chitosan stock solution: adding a chitosan raw material into the acetic acid solution obtained in step S1 for preliminary dissolution, and then placing a chitosan spinning solution after preliminary dissolution in a pretreatment machine;
S3, treating the chitosan spinning solution: starting the pretreatment machine, mixing the chitosan raw material with the acetic acid solution to form a mixture, and then separating, debubbling, and filtering the mixture to obtain the chitosan spinning solution; and
S4, preparing a chitosan fiber: transporting the chitosan spinning solution obtained in step S3 to a spinning nozzle using a metering pump, immersing the chitosan spinning solution sprayed from the spinning nozzle in a coagulation bath for double diffusion, and solidifying the spinning solution to form a nascent fiber; removing a residual solution by stretching the nascent fiber; removing chemical reagents with deionized water from the stretched nascent fiber, and performing shearing and drying to obtain the chitosan fiber;
wherein the pretreatment machine in step S3 comprises a body (1); a driving mechanism (2) is arranged in the body (1); a stirring mechanism (5) is arranged in the driving mechanism (2); a scraping mechanism (4) is arranged below the stirring mechanism (5); a preliminary treatment mechanism (3) is arranged at an inner upper side of the body (1); the driving mechanism (2) penetrates through the preliminary treatment mechanism (3) and is arranged in the body (1); a separation mechanism (6) is arranged on a bottom of the body (1); the body (1) comprises an outer drum (11); an inner drum (12) is arranged in the outer drum (11); separation holes (14) are symmetrically arranged in the inner drum (12); a guide slot (15) is formed in the inner drum (12); a baffle plate (13) is arranged outside the separation holes (14); a gap is arranged between the inner drum (12) and the outer drum (11); the baffle plate (13) is located between the inner drum (12) and the outer drum (11); the inner drum (12) is movably connected to the baffle plate (13); a base plate is arranged on a bottom of the inner drum (12) and a bottom of the outer drum (11); the baffle plate (13) is fixedly connected to the base plate; the inner drum (12) and the outer drum (11) are coaxially arranged;
the driving mechanism (2) comprises a driving motor (22); the driving motor (22) is located on a top of the outer drum (11); an output end of the driving motor (22) is provided with a threaded rod (21); the threaded rod (21) and the inner drum (12) are coaxially arranged;
the preliminary treatment mechanism (3) comprises an extrusion block (31); the extrusion block (31) is arranged in the inner drum (12), and the extrusion block (31) is movably connected to the inner drum (12); a first electric telescopic rod (37) is arranged on an inner side of the extrusion block (31); a matching block (32) is arranged at an end portion of the first electric telescopic rod (37); a second guide plate (36) is arranged below the matching block (32); a first guide plate (34) is arranged below the second guide plate (36); at least two layers of filter plates (33) are arranged between the first guide plate (34) and the second guide plate (36); each layer of filter plate (33) is spliced into a ring by several filter plates (33); a supporting block (35) is arranged on an inner side of each filter plate (33); the supporting block (35) is rotatably connected to the first guide plate (34); the filter plates (33) are rotatably connected to the first guide plate (34); the filter plates (33) are in contact with the second guide plate (36);
the stirring mechanism (5) comprises a stirring rod (52); at least one filter hole (51) is formed in the stirring rod (52); the stirring rod (52) is designed in an arc shape, and an end portion of the stirring rod (52) abuts against an inner wall of the inner drum (12); a connecting sleeve (53) is arranged in the stirring rod (52); the connecting sleeve (53) is in threaded connection with a threaded rod (21); a second telescopic rod is arranged at an end portion of the stirring rod (52); a guide ball (55) is arranged at an end portion of the second telescopic rod; and a connecting rod (56) is arranged outside the second telescopic rod.
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