A method of ammonification modification of ramie fiber and its application method in liquid ammonia solvent dyeing
A ramie fiber modification technology, which is applied in the ammonification modification field of ramie fiber, achieves the effects of reducing environmental pollution, shortening dyeing time, and solving uneven color difference
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Embodiment 1
[0026] (1) Pretreatment of ramie fiber: choose ramie yarn for ramie fiber, put 200mL of ramie yarn into 200mL NaOH solution with a concentration of 15%, heat it to 50°C, keep it warm for 4h, and wash it with tap water until the eluate When the pH is 7.6, the pretreated yarn is obtained.
[0027] (2) Modification method: add 10mL formaldehyde, 1mL boric acid and 150mL deionized water into a 250ml three-necked flask, stir evenly, add the 1g ramie yarn after the pretreatment of step (1), and raise the reaction temperature to 40 ℃, then feed ammonia gas, reflux and stir the reaction for 3 hours, after the reaction is completed, take out the yarn, wash it with deionized water, and dry the yarn when the pH of the eluate is 6-7, and the ammoniated modified Sexual ramie yarn.
[0028] (3) Elemental analysis of the modified yarn and the unmodified yarn was performed, and the following results were obtained:
[0029]
[0030] From the elemental analysis results, it can be seen that...
Embodiment 2
[0035] (1) Pretreatment of ramie fiber: choose ramie yarn for ramie fiber, put 200mL of ramie yarn into 200mL NaOH solution with a concentration of 15%, heat it to 50°C, keep it warm for 4h, and wash it with tap water until the eluate When the pH is 7.3, the pretreated yarn is obtained.
[0036] (2) Modification method: add 12mL formaldehyde in 250ml three-necked flask, 1.5mL boric acid and 150mL deionized water, stir evenly, add the 1g ramie yarn after the pretreatment of step (1), temperature of reaction is raised to At 40°C, add ammonia gas, reflux and stir for 3 hours. After the reaction is completed, take out the yarn and rinse it with deionized water. When the pH of the eluate is 6-7, dry the yarn to obtain ammoniated product. Modified ramie yarn.
[0037] (3) Elemental analysis of the modified yarn and the unmodified yarn was performed, and the following results were obtained:
[0038]
[0039] From the elemental analysis results, it can be seen that after the ramie ...
Embodiment 3
[0044] (1) Pretreatment of ramie fiber: choose ramie yarn for ramie fiber, put 200mL of ramie yarn into 200mL NaOH solution with a concentration of 15%, heat it to 50°C, keep it warm for 4h, and wash it with tap water until the eluate When the pH is 7.1, the pretreated yarn is obtained.
[0045] (2) Modification method: add 12mL formaldehyde in 250ml three-necked flask, 1.5mL boric acid and 150mL deionized water, stir evenly, add the 1g ramie yarn after the pretreatment of step (1), temperature of reaction is raised to At 40°C, add ammonia gas, reflux and stir for 3 hours. After the reaction is completed, take out the yarn and rinse it with deionized water. When the pH of the eluate is 6-7, dry the yarn to obtain ammoniated product. Modified ramie yarn.
[0046] (3) Elemental analysis of the modified yarn and the unmodified yarn was performed, and the following results were obtained:
[0047]
[0048] From the elemental analysis results, it can be seen that after the rami...
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