CN113774508B

CN113774508B - Spinning method based on air bag leftover material regenerated nylon 66 fiber

Info

Publication number: CN113774508B
Application number: CN202111080324.7A
Authority: CN
Inventors: 陈剑翔; 吴雯
Original assignee: Jiaxing Fuda Chemical Fiber Factory
Current assignee: Jiaxing Fuda Chemical Fiber Factory
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2023-08-08
Anticipated expiration: 2041-09-15
Also published as: CN113774508A

Abstract

The invention belongs to the technical field of spinning, and relates to a spinning method based on air bag leftover material regenerated nylon 66 fiber, which comprises the following steps: adding crushed nylon 66 safety airbag leftover materials with polyethylene films removed into a first extruder for extrusion granulation to obtain regenerated nylon 66 slices; continuously circulating nitrogen to dehumidify the regenerated nylon 66 slice through molecular sieve protection to obtain a dried regenerated nylon 66 slice; and mixing the dried regenerated nylon 66 slices with an auxiliary agent, adding the mixture into a second extruder, and carrying out melt extrusion and spinning to obtain the regenerated nylon 66 fibers. According to the invention, the moisture and impurities in the air bag leftover materials are eliminated in an environment-friendly mode, so that the influence of the moisture and impurities on the mechanical properties of the regenerated nylon 66 fibers is eliminated, meanwhile, the oxidation reaction of nylon 66 slices under the corresponding drying temperature condition is avoided, the quality of the product is improved, the primary color of the product is maintained, and then the auxiliary agent is added for melting to obtain good properties.

Description

Spinning method based on air bag leftover material regenerated nylon 66 fiber

Technical Field

The invention belongs to the technical field of spinning, and relates to a spinning production method, in particular to a spinning method based on air bag leftover material regenerated nylon 66 fibers.

Background

The automobile safety air bag is a bag-shaped fabric woven by medium-low denier industrial yarns, and the nylon 66 medium-low denier industrial yarns become the most ideal raw material of the air bag due to excellent characteristics. The nylon 66 fiber has the characteristics of low initial modulus, higher volumetric heat capacity, large extension, good elasticity and the like, so that the nylon 66 fabric has the advantages of uniform stress distribution, good shock resistance and the like under dynamic load, and the nylon 66 fabric has excellent flexibility and flame retardance. Therefore, the high-strength nylon 66 industrial yarn is widely applied to the preparation of fabrics such as safety air bags and the like. With the rapid development of the automobile industry, the rapid development of nylon 66 fibers for automobile safety air bags is promoted. The coated airbag fabric uses nylon 66 filament yarns as raw materials to coat neoprene, silicon rubber and the like, the coating thickness is thick, the coated fabric is easy to deteriorate, and the coated fabric is inconvenient to recycle; the uncoated airbag fabric is still produced by nylon 66 filament yarns by increasing the warp and weft yarn density and adopting processing approaches such as after finishing, disposable bagging and the like. The cloth cover formed by nylon 66 filaments for the non-coating type safety air bag which is commonly used at present is coated with a polyethylene film, and the cloth cover has high strength, good rebound resilience and high wear resistance. The airbag is inevitably produced with scraps in the production and processing process, and the quantity of the scraps can reach 5 to 10 percent of the yield. Therefore, the recycling of the airbag leftover materials has great economic and practical significance.

The nylon 66 fiber used as the air bag leftover material has simple and clean components and is convenient to recycle. Meanwhile, the nylon 66 fiber for the air bag leftover material has the characteristics of low initial modulus, large breaking elongation, good elasticity, high wear resistance, high heat content and the like. However, after the airbag leftover materials are recycled and re-granulated, the slices are often wide in molecular weight distribution, uneven in crystallinity distribution, higher in viscosity and poorer in fluidity, and certain difficulties are brought to subsequent spinning and re-processing. Therefore, there is an urgent need to find a suitable spinning method which has important significance for recycling the airbag scraps.

Chinese patent CN106497025a discloses a method for recovering waste cloth from clothing production, which specifically comprises: selecting waste cloth with a single cloth component of nylon material, and cutting the waste cloth into pieces with the length and width of not more than 8cm after ultraviolet disinfection treatment; adding the auxiliary agent and the new nylon 66 particles, extruding by a double screw extrusion device, cooling and granulating to obtain the regenerated nylon 66 plastic particles. However, if the scheme is used for directly recycling the airbag leftover materials and regenerating fibers, the mechanical properties of the regenerated nylon 66 are insufficient.

Chinese patent CN107739525a discloses a method for recovering waste air bags in production, which specifically comprises: heating and dissolving the waste air bags by using a phenol-glacial acetic acid solution, filtering and evaporating; then reacting with cashew nut shell oil under vacuum condition; adding additives such as polypropylene, melting, extruding, cooling and granulating to obtain the regenerated nylon 66 plastic particles special for the automobile bumpers. However, the patent uses a large amount of organic solvents and other auxiliary agents in the recovery process, which is not beneficial to environmental protection.

Disclosure of Invention

The invention aims to solve the problems and provide a spinning method based on air bag leftover material regenerated nylon 66 fiber.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the invention creatively provides a spinning method based on air bag leftover material regenerated nylon 66 fiber, which comprises the following steps:

(1) Adding crushed nylon 66 safety airbag leftover materials with polyethylene films removed into a first extruder for extrusion granulation to obtain regenerated nylon 66 slices;

(2) Continuously circulating nitrogen to dehumidify the regenerated nylon 66 slice through molecular sieve protection to obtain a dried regenerated nylon 66 slice;

(3) And mixing the dried regenerated nylon 66 slices with an auxiliary agent, adding the mixture into a second extruder, and carrying out melt extrusion and spinning to obtain the regenerated nylon 66 fibers.

In the spinning method based on the regenerated nylon 66 fiber of the air bag leftover materials,

the drying temperature of the molecular sieve protection continuous circulation nitrogen dehumidification is 95-105 ℃, and the water content of the obtained dried regenerated nylon 66 slice is 0.07-0.08%.

the molecular sieve protection continuous circulation nitrogen dehumidification concrete mode is that the regenerated nylon 66 slice is sealed, and the heated nitrogen is adopted for circulation drying.

the molecular sieve protection continuous type circulating nitrogen dehumidification is carried out by adopting continuous type circulating nitrogen and molecular sieve dehumidification drying equipment, the continuous type circulating nitrogen and molecular sieve dehumidification drying equipment comprises a sealed drying container, an air inlet device and an air outlet device are connected to the drying container, and a dehumidification device filled with molecular sieve dehumidifying agent and a nitrogen heater are sequentially arranged between the air outlet device and the air inlet device.

In the spinning method based on the air bag leftover material regenerated nylon 66 fiber, the auxiliary agent comprises one or more than two of polyether, N-alkyl polyamide, iodobenzoic acid, POE grafted maleic anhydride, nylon 6, SBS grafted maleic anhydride, ethylene-octene copolymer grafted maleic anhydride and EPDM grafted maleic anhydride, and the use amount of the auxiliary agent is 1-30wt% of the total amount of the dried regenerated nylon 66 chips and the auxiliary agent.

In the spinning method based on the regenerated nylon 66 fiber with the air bag leftover materials, the auxiliary agent also comprises a leveling component, wherein the leveling component comprises gluconic acid, ethylenediamine tetramethylene phosphonic acid and 1-phenoxy-2-propanol.

In the spinning method based on the regenerated nylon 66 fiber with the air bag leftover materials, the use level of the leveling component is 0.5-1wt% of the total amount of the dried regenerated nylon 66 slices and the auxiliary agent.

The leveling components comprise 1-2 parts of quercetin 3-O-glucoside, 1-2 parts of ethylenediamine tetramethylene phosphonic acid and 5-8 parts of 1-phenoxy-2-propanol according to parts by weight.

In the spinning method based on the air bag leftover material regenerated nylon 66 fiber, two dehumidifying devices are connected in parallel between the downstream end of the air outlet device and the nitrogen heater, and a valve is respectively arranged in front of and behind each dehumidifying device.

In the spinning method based on the air bag leftover material regenerated nylon 66 fiber, a drying cavity is arranged in the drying container, the drying cavity is connected with the air inlet device through a multi-channel nitrogen input pipe arranged at the top of the drying cavity, the side wall of the drying cavity is an outwards convex arc surface, a hemispherical sealing cover which can be opened and closed and connected with the side wall of the drying cavity is arranged at the bottom of the drying cavity, an elastic net structure which is used for supporting regenerated nylon 66 slices and provided with meshes is arranged at the top of the hemispherical sealing cover, a dehumidifying space which is communicated with the drying cavity through the meshes is formed below the elastic net structure, and an exhaust pipe which is connected with the air outlet device is arranged in the dehumidifying space.

In the spinning method based on the air bag leftover material regenerated nylon 66 fiber, the multichannel nitrogen input pipe comprises a main distribution pipe, a plurality of first branch pipes connected to the main distribution pipe along the circumferential direction and a plurality of second branch pipes connected to the main distribution pipe along the circumferential direction, wherein the outlets of the plurality of first branch pipes are obliquely and downwards arranged along the direction deviating from the axis of the main distribution pipe, and the plurality of first branch pipes are inclined along the same rotation direction in the axial projection direction; the outlets of the second branch pipes are obliquely downwards arranged along the direction deviating from the axis of the main distribution pipeline, and a plurality of second branch pipes are obliquely arranged along the same direction as the first branch pipes in the axial projection direction; the first branch pipes are positioned above the second branch pipes, and the circumferential diameters formed by the outlets of the second branch pipes are smaller than the circumferential diameters formed by the outlets of the first branch pipes.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a spinning method of regenerated nylon 66 fiber based on air bag leftover materials, which eliminates the influence of water and impurities in the air bag leftover materials on the mechanical property of the regenerated nylon 66 fiber in an environment-friendly mode, simultaneously avoids the oxidation reaction of nylon 66 slices under the corresponding drying temperature condition, improves the quality of products, keeps the primary colors of the products, and further adds an auxiliary agent for melting to obtain good performance.

The auxiliary agent selected by the invention can reduce the plastic temperature and the melting point of the melt, reduce the melt mixing of the melt and has good compatibility. The auxiliary agent influences the crystal form and the crystallinity of the dried regenerated nylon 66 slice during cooling crystallization, thereby being beneficial to obtaining the regenerated nylon 66 fiber with excellent mechanical properties.

In one optional embodiment, the auxiliary agent is further added with a leveling component, so that the flexibility of the regenerated nylon 66 fiber can be enhanced, a compact molecular structure can be formed, the leveling effect of the regenerated nylon 66 fiber is facilitated, and the application scene and the economic benefit of the regenerated nylon 66 fiber are further improved.

The quercetin 3-O-glucoroniside has CAS number of 22688-79-5, contains ketooxy and hydroxyl groups in the molecular structure, and can be combined with leveling components to improve the flexibility of nylon fiber and facilitate the permeation and combination of dye.

According to the invention, the regenerated nylon 66 slices are dried by continuously circulating nitrogen and molecular sieve dehumidifying and drying equipment, and by improving the equipment, the nitrogen forms a double-cyclone mode in the drying cavity, so that the circulation of gas is facilitated, the air flow is matched with an elastic net structure to enable the slice particles to fully move in the drying cavity, the nitrogen extrudes water vapor from the upper part and is discharged downwards, the nitrogen with the water vapor is pumped out from a bottom dehumidifying space, the accumulation of the water vapor is avoided, and the dehumidifying capability is greatly improved. The drying time can be reduced by 80% compared with the conventional oven.

Drawings

FIG. 1 is a block diagram of a process flow provided in the present invention;

FIG. 2 is a schematic diagram of a molecular sieve protected continuous circulation nitrogen dehumidification system provided in the present invention;

fig. 3 is a schematic structural view of a multi-channel nitrogen gas inlet pipe provided in the present invention.

In the figure, a drying container 1, a drying cavity 10, a multi-channel nitrogen gas input pipe 11, a main distribution pipe 110, a first branch pipe 111, a second branch pipe 112, an exhaust pipe 12, an elastic net structure 13, a dehumidifying space 14, a hemispherical cover 15, an air inlet device 2, an air outlet device 3, a dehumidifying device 4 and a nitrogen heater 5.

Detailed Description

Further illustrated by the following specific examples;

example 1

As shown in FIG. 1, the spinning method based on the regenerated nylon 66 fiber of the air bag leftover material comprises the following steps:

s1, selecting nylon 66 filaments for the non-coated type air bags as leftover materials of the nylon 66 air bags, removing the polyethylene film, and crushing to obtain the nylon 66 materials.

S2, adding nylon 66 material into a first extruder which is a double-screw extruder, wherein the temperature of each section in the first extruder is 290 ℃, 295 ℃, 300 ℃ and 295 ℃ respectively, the screw speed is 250r/min, and then granulating through circulating water cooling to obtain regenerated nylon 66 slices.

S3, continuously circulating nitrogen to dehumidify the regenerated nylon 66 slice through molecular sieve protection to obtain a dried regenerated nylon 66 slice with the water content of 0.07-0.08%, wherein the temperature of the nitrogen used for drying reaches 95-105 ℃.

As shown in fig. 2 and 3, the molecular sieve protection continuous type circulating nitrogen dehumidification is performed by adopting continuous type circulating nitrogen and molecular sieve dehumidification drying equipment, the continuous type circulating nitrogen and molecular sieve dehumidification drying equipment comprises a sealed drying container 1, an air inlet device 2 and an air outlet device 3 are connected to the drying container 1, and a dehumidification device 4 and a nitrogen heater 5 filled with molecular sieve dehumidifiers are sequentially arranged between the air outlet device 3 and the air inlet device 2.

The air inlet device 2 and the air outlet device 3 are circulating fans. Two dehumidifying devices 4 are connected in parallel between the downstream end of the air outlet device 3 and the nitrogen heater 5, and a valve is respectively arranged in front of and behind each dehumidifying device 4, so that the dehumidifying agent can be conveniently replaced in a non-stop state.

A drying cavity 10 is arranged in the drying container 1, the drying cavity 10 is connected with the air inlet device 2 through a multi-channel nitrogen input pipe 11 arranged at the top of the drying cavity 10, the side wall of the drying cavity 10 is an outwards convex arc surface, and a hemispherical sealing cover 15 which can be connected with the side wall of the drying cavity 10 in an opening and closing mode is arranged at the bottom of the drying cavity 10. The drying cavity 10 is a space with a width larger than the height, the circular arc shape of the side wall is favorable for forming cyclone, and the bouncing slice particles can keep enough movement time on the side wall, so that the removal of moisture is accelerated, and the product in the drying cavity 10 is sealed and discharged through the hemispherical cover 15.

The top of the hemispherical cover 15 is provided with an elastic net structure 13 for supporting the regenerated nylon 66 slices and having meshes, a dehumidifying space 14 communicated with the drying cavity 10 through the meshes is formed below the elastic net structure 13, and the dehumidifying space 14 is provided with an exhaust tube 12 connected with the air outlet device 3.

The elastic net structure 13 is a steel wire net or a high temperature resistant fiber net with meshes. The sliced particles falling on the elastic net structure 13 can be made to freely spring.

The multichannel nitrogen inlet pipe 11 includes a distribution main pipe 110, five first branch pipes 111 connected to the distribution main pipe 110 in the circumferential direction, and five second branch pipes 112 connected to the distribution main pipe 110 in the circumferential direction.

The outlets of the five first branch pipes 111 are inclined downward in a direction away from the axis of the distribution main pipe 110, and the plurality of first branch pipes 111 are inclined in the same rotation direction in the axial projection direction. The air streams generated at the outlets of the five first branch pipes 111 form a first spiral air stream.

The outlets of the second branch pipes 112 are inclined downward in a direction away from the axis of the distribution main pipe 110, and the plurality of second branch pipes 112 are inclined in the same direction as the first branch pipes 111 in the axial projection direction. The air flow generated at the outlets of the five second branch pipes 112 forms a second spiral air flow.

The first branch pipes 111 are located above the second branch pipes 112, and the circumferential diameters formed by the outlets of the plurality of second branch pipes 112 are smaller than the circumferential diameters formed by the outlets of the plurality of first branch pipes 111. The first spiral gas flow is arranged outside the second spiral gas flow, so that the nitrogen input device of the double spiral gas flow is formed.

Specifically, the outlets of the first branch pipe 111 and the second branch pipe 112 may each be provided with a jet head.

S4, POE grafted maleic anhydride and iodobenzoic acid are mixed according to the weight ratio of 6.5:3.5 to be used as an auxiliary agent, 10wt% of the total amount of the dried regenerated nylon 66 slices and the auxiliary agent is added into a second extruder, the second extruder is a double-screw extruder, the temperatures of all sections in the second extruder are 284 ℃, 292 ℃, 300 ℃ and 292 ℃, the screw rotation speed is 290r/min, and the mixture enters a spinning component for spinning through a metering pump after melt extrusion.

And S5, cooling the tows sprayed out of a spinneret plate of the spinning assembly through circular blowing, passing through a channel to a winding section, uniformly spreading the balanced winding tows through a bundling frame under tension, then guiding the balanced winding tows into a drawing roller, carrying out hot drawing to a technological value through an oil bath at 53 ℃ and steam at 100 ℃, loading a preservative, and then boxing and stacking.

Example 2

This example is essentially the same as example 1 except that the adjuvant is POE grafted maleic anhydride, iodobenzoic acid and nylon 6 in a weight ratio of 6.5:3.5:10, the adjuvant being added at 20wt% of the total of dry regenerated nylon 66 chips and adjuvant.

Example 3

This example is essentially the same as example 1 except that the adjuvant is POE grafted maleic anhydride, iodobenzoic acid, quercetin 3-O-glucoside, ethylenediamine tetramethylene phosphonic acid and 1-phenoxy-2-propanol in a weight ratio of 6.5:3.5:1:1:5.

Application example

Regenerated nylon 66 fibers were prepared by the methods of examples 1 to 3, respectively, and tested with commercially available airbag trim regenerated nylon 66 fibers (hereinafter, commercially available products) for melt index as shown in Table 1 below:

TABLE 1

The result shows that the regenerated nylon 66 fiber prepared by the invention has better fluidity and thus better flexibility.

Comparative example 1

This comparative example is basically the same as example 1, except that the step S3 treatment is not performed.

Comparative example 2

This comparative example is substantially the same as comparative example 1 except that step S3 is changed to the hot air circulation drying using the same temperature air.

Regenerated nylon 66 fibers were made by the methods of examples 1-3 and comparative examples 1 and 2, respectively, and tested for mechanical properties as shown in table 2 below:

TABLE 2

The result shows that the regenerated nylon 66 fiber prepared by the invention has better mechanical property.

The regenerated nylon 66 fibers produced by the methods of examples 1-3 and comparative examples 1 and 2 were produced into fabrics 1-5, respectively.

500ml of water is heated to 45 ℃, 25g of fabric woven by regenerated nylon fibers, 2% of dye, 1% of glacial acetic acid and 0.5% of peregal O are added, other leveling agents are not added, the temperature is raised to 93 ℃ at the heating rate of 5 ℃ per minute, and the temperature is kept for 30 minutes. The dye used was the acid dye turquoise blue dye, and the dyeing was carried out in an infrared dyeing machine. Washing after dyeing, spin-drying and dehydrating by a washing machine, and drying for 15 minutes at 80 ℃.

The dyed regenerated nylon fabric is subjected to uniformity test, the equipment used in the test is Datacolor 800, and the basic composition of Datacolor consists of a light source, a separation monochromator and a photoelectric detector. The operation process is that white light emitted by a light source of a spectrometer irradiates on a sample, reflected light is separated by a prism or a grating and then is detected by a photoelectric detector to calculate the reflectivity of each wavelength, and a computer color matching system calculates a color value according to the reflectivity or calculates a formula or color difference in coordinates of a three-degree color space.

The testing method is that 15 points are selected on the same fabric, CIE DE and CMC DE values are tested, average values of the CIE DE and CMC DE values of the 15 points are calculated respectively, and the smaller the average values of the two groups are, the smaller the chromatic aberration is. The test results are shown in table 3 below:

TABLE 3 Table 3

	Example 1	Example 2	Example 3	Comparative example 1	Comparative example 2
						CIEDE	1.44	1.42	0.92	1.65	1.53
CMCDE	0.72	0.71	0.55	0.83	0.76

The results show that the dyeing uniformity of the nylon fabric can be improved, and especially in the embodiment 3, the dyeing performance of the fabric can be greatly improved due to the addition of the leveling component, and the nylon fabric can also have good dyeing uniformity under the condition that no leveling agent is additionally added.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms of the drying vessel 1, the drying chamber 10, the multi-channel nitrogen gas input pipe 11, the main distribution pipe 110, the first branch pipe 111, the second branch pipe 112, the exhaust pipe 12, the elastic net structure 13, the dehumidifying space 14, the hemispherical cover 15, the air inlet device 2, the air outlet device 3, the dehumidifying device 4, the nitrogen heater 5, etc. are used more herein, the possibility of using other terms is not excluded. These terms are only used to more conveniently describe and explain the nature of the invention and should be construed in a manner consistent with their spirit and scope.

Claims

1. The spinning method for regenerating the nylon 66 fiber based on the airbag leftover materials is characterized by comprising the following steps of:

(2) Continuously circulating nitrogen to dehumidify the regenerated nylon 66 slice through molecular sieve protection to obtain a dried regenerated nylon 66 slice; the drying temperature of the molecular sieve protection continuous circulation nitrogen dehumidification is 95-105 ℃, and the water content of the obtained dried regenerated nylon 66 slice is 0.07-0.08%;

(3) Mixing the dried regenerated nylon 66 slice with an auxiliary agent, adding the mixture into a second extruder, and carrying out melt extrusion and spinning to obtain regenerated nylon 66 fibers;

the auxiliary agent comprises one or more than two of polyether, N-alkyl polyamide, iodobenzoic acid, POE grafted maleic anhydride, nylon 6, SBS grafted maleic anhydride, ethylene-octene copolymer grafted maleic anhydride and EPDM grafted maleic anhydride;

the auxiliary agent also comprises a leveling component, wherein the leveling component is quercetin 3-O-glucopyranoside, ethylenediamine tetramethylene phosphonic acid and 1-phenoxy-2-propanol.

2. The spinning method of the regenerated nylon 66 fiber based on the air bag leftover materials as claimed in claim 1, wherein the spinning method comprises the following steps:

3. The spinning method of the regenerated nylon 66 fiber based on the air bag leftover materials as claimed in claim 2, wherein the spinning method comprises the following steps:

the molecular sieve protection continuous type circulating nitrogen dehumidification is carried out by adopting continuous type circulating nitrogen and molecular sieve dehumidification drying equipment, the continuous type circulating nitrogen and molecular sieve dehumidification drying equipment comprises a sealed drying container (1), an air inlet device (2) and an air outlet device (3) are connected to the drying container (1), and a dehumidification device (4) filled with molecular sieve dehumidifying agent and a nitrogen heater (5) are sequentially arranged between the air outlet device (3) and the air inlet device (2).

4. The spinning method of the regenerated nylon 66 fiber based on the air bag leftover materials as claimed in claim 1, wherein the spinning method comprises the following steps:

the dosage of the auxiliary agent is 1-30wt% of the total amount of the dried regenerated nylon 66 slice and the auxiliary agent.

5. The spinning method for regenerating nylon 66 fiber based on air bag leftover materials as set forth in claim 4, wherein:

the dosage of the leveling component is 0.5-1wt% of the total amount of the dry regenerated nylon 66 slice and the auxiliary agent;

6. The spinning method for regenerating nylon 66 fiber based on air bag leftover materials as set forth in claim 3, wherein:

two dehumidification devices (4) are connected in parallel between the downstream end of the air outlet device (3) and the nitrogen heater (5), and a valve is arranged in front of and behind each dehumidification device (4).

7. The spinning method of the regenerated nylon 66 fiber based on the air bag leftover materials as claimed in claim 6, wherein the spinning method comprises the following steps:

be provided with drying chamber (10) in drying container (1), this drying chamber (10) are connected with hot blast blowpipe apparatus (2) through multichannel nitrogen gas input tube (11) that set up at its top, the lateral wall of drying chamber (10) is the arcwall face of outwards evagination, the bottom of drying chamber (10) is provided with hemispherical closing cap (15) that can open and shut with drying chamber (10) lateral wall and be connected, but the top of this hemispherical closing cap (15) is equipped with elastic net structure (13) that are used for bearing regeneration nylon 66 section and have the mesh, and elastic net structure (13) below forms dehumidification space (14) through mesh and drying chamber (10) intercommunication, and this dehumidification space (14) are equipped with exhaust tube (12) that are connected with air-out device (3).

8. The spinning method of the regenerated nylon 66 fiber based on the air bag leftover materials as claimed in claim 7, wherein the spinning method comprises the following steps:

the multi-channel nitrogen gas input pipe (11) comprises a main distribution pipe (110), a plurality of first branch pipes (111) connected to the main distribution pipe (110) along the circumferential direction and a plurality of second branch pipes (112) connected to the main distribution pipe (110) along the circumferential direction, wherein the outlets of the first branch pipes (111) are obliquely and downwards arranged along the direction deviating from the axis of the main distribution pipe (110), and the first branch pipes (111) are inclined along the same rotation direction in the axial projection direction; the outlets of the second branch pipes (112) are obliquely downwards arranged along the direction away from the axis of the main distribution pipe (110), and a plurality of second branch pipes (112) are obliquely arranged along the same direction as the first branch pipes (111) in the axial projection direction; the first branch pipes (111) are located above the second branch pipes (112), and the circumferential diameters formed by the outlets of the second branch pipes (112) are smaller than the circumferential diameters formed by the outlets of the first branch pipes (111).