Nylon fiber and its preparation method

Abstract

The invention discloses a method for preparing nylon fibers, which comprises the steps of performing polymerization reaction on raw materials containing 1,5-pentamethylenediamine and adipic acid and then directly spinning them. The present invention also provides a nylon fiber prepared by the aforementioned method. The method of the invention prepares nylon 56 yarn by combining nylon polymerization and melt direct spinning, which reduces production cost, waste gas discharge and environmental pollution. The high-performance nylon fiber prepared by the present invention can be further used to make textile materials such as yarn, woven fabric, knitted fabric or non-woven fabric, and can be applied to the fields of clothing, industry, decorative carpets, etc., and has a wide range of industrial applications. Application prospect.

Description

technical field

[0001] The invention relates to a nylon fiber and a preparation method thereof, in particular to a nylon 56 fiber and a preparation method thereof. Background technique

[0002] Nylon fiber is one of the first synthetic fibers put into industrial production in the world, and its output ranks second among synthetic fibers. Nylon low-denier yarn (200-700dtex) has the characteristics of high breaking strength, wear resistance, fatigue resistance, impact resistance, and good dimensional stability. It is widely used in military products, rubber skeleton materials, airbag wires and ropes, nets, cables fabrics, tarpaulins, industrial filter cloths and other fields; at the same time, because of its soft hand feeling, light texture, good drapability, breathable moisture absorption, good elasticity, easy processing and other good wearability, it is used in high-grade sewing thread silk, T-shirt silk, Umbrella fabrics, sports textiles and other fields have good market ...

Examples

preparation example Construction

[0042] The preparation method of the nylon fiber of the present invention includes direct spinning after polymerizing raw materials containing 1,5-pentanediamine and adipic acid.

[0043] There are two main ways to realize the industrialization of nylon polymerization process, one is continuous polymerization process, and the other is batch polymerization process. In the present invention, there is no limitation on the way to realize the polymerization reaction of 1,5-pentanediamine and adipic acid, and it can be realized by any one of the above two processes.

[0044] In the preparation method of the nylon fiber of the present invention, the polymerization reaction further includes the following steps: 1) making 1,5-pentanediamine and adipic acid into a nylon salt solution; 2) concentrating the nylon salt solution; 3) Precondensing the concentrated nylon salt solution to obtain a prepolymer; 4) further dehydrating and polymerizing the prepolymer to obtain a nylon 56 melt.

...

Embodiment 1

[0131] Mix 1,5-pentamethylenediamine and adipic acid into 5 tons of 60% aqueous solution in the salt-forming kettle 1, adjust the pH value to 7.6 (dilute the salt solution to 10% test result), control the temperature at 50°C, and pass through the filter Transfer to the intermediate tank 2, then heat up to 90°C by the first preheater 3, and then enter the concentration tank 4 to further concentrate to 80% concentration, the outlet temperature of the concentration tank 4 is 120°C, and the solution passes through the second preheater 5 After further heating to 213°C, it enters the reactor 6. The pressure of the reactor 6 is 1.73MPa, and the outlet temperature is controlled at 240°C. The steam is recovered and reused through the cooling tower. The reaction liquid then enters the flash evaporator 8 to remove most of the water, and the pressure drops to Atmospheric pressure. Finally, the polymerization reaction is completed through the front polymerizer 9 and the rear polymerizer 10...

Embodiment 2

[0134] Mix 1,5-pentamethylenediamine and adipic acid into 5 tons of 60% aqueous solution in salt forming kettle 1, adjust the pH value to 7.6 (dilute the salt solution to 10% test result), add 5% nylon 56 salt weight Nylon 66 salt, the temperature is controlled at 50°C, transferred to the intermediate tank 2 through the filter, and then heated by the first preheater 3 to 90°C, then enters the concentration tank 4 to further concentrate to 80% concentration, and the concentration tank 4 exits The temperature is 120°C. The solution is further heated to 213°C by the second preheater 5 and then enters the reactor 6. The pressure of the reactor 6 is 1.73MPa, and the outlet temperature is controlled at 240°C. The steam is recovered and reused through the cooling tower, and the reaction liquid is subsequently Enter the flash evaporator 8 to remove most of the moisture, and the pressure drops to normal pressure. Finally, the polymerization reaction is completed through the front and r...

technical field

[0001] The invention relates to a nylon fiber and a preparation method thereof, in particular to a nylon 56 fiber and a preparation method thereof. Background technique

[0002] Nylon fiber is one of the first synthetic fibers put into industrial production in the world, and its output ranks second among synthetic fibers. Nylon low-denier yarn (200-700dtex) has the characteristics of high breaking strength, wear resistance, fatigue resistance, impact resistance, and good dimensional stability. It is widely used in military products, rubber skeleton materials, airbag wires and ropes, nets, cables fabrics, tarpaulins, industrial filter cloths and other fields; at the same time, because of its soft hand feeling, light texture, good drapability, breathable moisture absorption, good elasticity, easy processing and other good wearability, it is used in high-grade sewing thread silk, T-shirt silk, Umbrella fabrics, sports textiles and other fields have good market ...

Examples

preparation example Construction

[0042] The preparation method of the nylon fiber of the present invention includes direct spinning after polymerizing raw materials containing 1,5-pentanediamine and adipic acid.

[0043] There are two main ways to realize the industrialization of nylon polymerization process, one is continuous polymerization process, and the other is batch polymerization process. In the present invention, there is no limitation on the way to realize the polymerization reaction of 1,5-pentanediamine and adipic acid, and it can be realized by any one of the above two processes.

[0044] In the preparation method of the nylon fiber of the present invention, the polymerization reaction further includes the following steps: 1) making 1,5-pentanediamine and adipic acid into a nylon salt solution; 2) concentrating the nylon salt solution; 3) Precondensing the concentrated nylon salt solution to obtain a prepolymer; 4) further dehydrating and polymerizing the prepolymer to obtain a nylon 56 melt.

...

Embodiment 1

[0131] Mix 1,5-pentamethylenediamine and adipic acid into 5 tons of 60% aqueous solution in the salt-forming kettle 1, adjust the pH value to 7.6 (dilute the salt solution to 10% test result), control the temperature at 50°C, and pass through the filter Transfer to the intermediate tank 2, then heat up to 90°C by the first preheater 3, and then enter the concentration tank 4 to further concentrate to 80% concentration, the outlet temperature of the concentration tank 4 is 120°C, and the solution passes through the second preheater 5 After further heating to 213°C, it enters the reactor 6. The pressure of the reactor 6 is 1.73MPa, and the outlet temperature is controlled at 240°C. The steam is recovered and reused through the cooling tower. The reaction liquid then enters the flash evaporator 8 to remove most of the water, and the pressure drops to Atmospheric pressure. Finally, the polymerization reaction is completed through the front polymerizer 9 and the rear polymerizer 10...

Embodiment 2

[0134] Mix 1,5-pentamethylenediamine and adipic acid into 5 tons of 60% aqueous solution in salt forming kettle 1, adjust the pH value to 7.6 (dilute the salt solution to 10% test result), add 5% nylon 56 salt weight Nylon 66 salt, the temperature is controlled at 50°C, transferred to the intermediate tank 2 through the filter, and then heated by the first preheater 3 to 90°C, then enters the concentration tank 4 to further concentrate to 80% concentration, and the concentration tank 4 exits The temperature is 120°C. The solution is further heated to 213°C by the second preheater 5 and then enters the reactor 6. The pressure of the reactor 6 is 1.73MPa, and the outlet temperature is controlled at 240°C. The steam is recovered and reused through the cooling tower, and the reaction liquid is subsequently Enter the flash evaporator 8 to remove most of the moisture, and the pressure drops to normal pressure. Finally, the polymerization reaction is completed through the front and r...

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