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Preparation method of LiCl modified nylon 6 fiber

A technology for modifying nylon and fiber, which is applied in the field of fiber spinning and processing. It can solve the problems of LiCl shedding, short production cycle, easy water absorption and deliquescence, etc., and achieve high draft ratio, short production cycle, high breaking strength and modulus. Effect

Inactive Publication Date: 2013-12-25
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of LiCl modified nylon 6 fiber, especially to provide a method for preparing modified nylon 6 fiber after coating LiCl with high-speed blending depth, which solves the problem of LiCl falling off and exposure to air The problem of easy water absorption and deliquescence ensures the smooth spinning of nylon 6 chips, and the preparation process is simple, the production cost is low, the production cycle is short, and it is suitable for industrial production
In the present invention, the method of external heating and high-speed blending is used to coat different proportions of LiCl in the surface layer of nylon 6, and there is no serious adhesion between the slices, and then melt spinning is carried out to effectively prevent lithium chloride from falling off the polymer surface. , and use the polymer surface to block the contact between lithium chloride and the air on the surface of the slice, which solves the problem of LiCl moisture absorption. Due to the role of LiCl in breaking up the hydrogen bonds between macromolecules, the processability of nylon 6 is greatly improved, and the spinning and drawing process It becomes easy, and in the pressure washing process of conventional nylon 6 processing, lithium chloride is washed away, and hydrogen bonds are re-formed between fiber macromolecules, and nylon 6 fibers with small denier, high strength, and good comprehensive mechanical properties can be prepared

Method used

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  • Preparation method of LiCl modified nylon 6 fiber

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Experimental program
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Effect test

Embodiment 1

[0038] The LiCl and nylon 6 slices were vacuum-dried separately, the vacuum degree was 0.05KPa, and the proportion of nylon 6 mass fraction was 99.5% and LiCl mass fraction was 0.5%, and the nylon 6 slices were directly mixed with lithium chloride at high speed using a high-speed blender. For blending, the speed of the high-speed mixer is 2000r / min, the heating temperature is 180°C, and the mixing time is 3min. Then melt spinning, the spinning temperature is zone I: 265°C; zone II: 280°C; zone III: 280°C; zone IV: 282°C. The spinning speed is 800m / min, the coiled yarn is drawn twice, the temperature of the hot plate of the flat drawing machine is 60°C, the temperature of the hot plate is 120°C, the draw ratio is 5 times, and the hot water at 90°C is added Hydrazine hydrate with a content of 0.001% of the solvent mass, and then the fiber was washed with the hot water for 30 minutes, and the pump pressure was 2Kgf; after that, it was heat-set at 120°C for 30 minutes, and the vac...

Embodiment 2

[0040] The LiCl and nylon 6 slices were vacuum-dried separately, the vacuum degree was 0.1KPa, and the proportion of nylon 6 mass fraction was 98.5% and LiCl mass fraction was 1.5%, and the nylon 6 slices were directly mixed with lithium chloride at high speed using a high-speed blender. For blending, the speed of the high-speed mixer is 2500r / min, the heating temperature is 185°C, and the mixing time is 2min. Then melt spinning, the spinning temperature is zone I: 265°C; zone II: 280°C; zone III: 280°C; zone IV: 282°C. The spinning speed is 800m / min, the coiled yarn is drawn twice, the temperature of the hot plate of the flat drawing machine is 60°C, the temperature of the hot plate is 120°C, the draw ratio is 4.0 times, and the NaOH solution at 70°C is added Antioxidant 168 with a content of 0.005% of the mass of the solvent, and then press-wash the fiber with the solution for 1.5 hours, and the pump pressure is 1Kgf; then heat-set at 100°C for 1 hour, and the vacuum degree ...

Embodiment 3

[0042] The LiCl and Nylon 6 slices were vacuum-dried separately at a vacuum degree of 10KPa. According to the ratio of Nylon 6 mass fraction of 97.5% and LiCl mass fraction of 2.5%, Nylon 6 slices were directly mixed with lithium chloride at high speed using a high-speed blender. Mixing, the speed of the high-speed mixer is 3500r / min, the heating temperature is 170°C, and the mixing time is 4min. Then melt spinning, the spinning temperature is zone I: 260°C; zone II: 283°C; zone III: 280°C; zone IV: 282°C. The spinning speed is 800m / min, and the coiled yarn is drawn twice. The temperature of the hot plate of the flat drawing machine is 70°C, the temperature of the hot plate is 130°C, and the draw ratio is 4.0 times. Add it to the ethanol solution at 60°C Antioxidant 3114 with a content of 0.08% of the solvent mass, and then the fiber was pressure washed with the solution for 2 hours, and the pump pressure was 3Kgf; after that, it was heat-set at 125°C for 20 minutes, and the v...

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Abstract

The invention relates to a preparation method of LiCl modified nylon 6 fiber and particularly relates to a method for deeply coating LiCl by high-speed blending and then preparing the modified nylon 6 fiber. The method comprises the following steps: firstly slicing the LiCl and nylon 6, respectively drying, removing crystal water in the LiCl and water in nylon 6 slices, further deeply coating different contents of the LiCl in surface layers of the nylon 6 slices by using a high-speed blending machine to prevent the situation that the LiCl is exposed in air and absorbs the water to affect the smooth operation of spinning, then performing melt spinning and heat drawing on the treated nylon 6 slices, performing pressure washing to remove monomers in the nylon 6 fiber and simultaneously remove the LiCl to enable the nylon 6 fiber to reform hydrogen bonds, and finally performing vacuum heat setting. According to the method disclosed by the invention, the problem that the LiCl absorbs water before spinning, so that spinning processing is influenced, can be effectively solved, and the prepared nylon 6 fiber has the advantages of small fiber number, high strength and excellent comprehensive mechanical properties, and can be widely applied to the clothing field and the industrial field. The preparation process is simple, the production period is short, the cost is low, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of fiber spinning processing, and relates to a preparation method of LiCl modified nylon 6 fiber, in particular to a method for preparing modified nylon 6 fiber after deeply coating LiCl with high-speed blending. Background technique [0002] Nylon 6 fiber is the earliest synthetic fiber variety to be industrialized. Its flexibility, elastic recovery rate, abrasion resistance, alkali resistance, moisture absorption and light weight are better than polyester fiber. In the field of clothing, it can be used for men, women and children's clothing, quilt cover fabrics, socks, raincoats, etc. In the field of home decoration, it can be used for curtain cloth, shower curtain cloth and umbrella cloth, etc. In the industrial field, it can be used for fishing nets, filter cloth, cables, conveyor belts and parachute cloth, etc. . Due to its high strength, impact resistance and good wear resistance, it can be used in tire cords. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D01F6/90D01F1/10D01F11/08D01D13/00D01D1/04
Inventor 王依民周凤娟王燕萍倪建华夏于旻汪满意
Owner DONGHUA UNIV
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