阅读说明：本技术 一种废旧纤维制品制备再生聚酯长纤的纺丝工艺 (Spinning process for preparing regenerated polyester long fibers from waste fiber products ) 是由 施文东 祝建勋 邢朝东 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种废旧纤维制品制备再生聚酯长纤的纺丝工艺,涉及废旧纤维再生技术领域。该纺丝工艺选取废旧聚酯纤维制品预处理得到再生聚酯纤维原料,选取废旧棉纤维制品预处理得到再生棉纤维原料,再生聚酯纤维原料、再生棉纤维原料、扩链剂、十六烷基磷酸酯盐和聚乙二醇混合后,加热熔融得到再生混合聚酯切片,再生混合聚酯切片纺丝、后整理得到再生聚酯长纤；该纺丝工艺进行废物利用,通过扩链剂的扩链作用,配合聚乙二醇良好的吸湿性能,十六烷基磷酸酯盐优良的抗静电性,使得聚酯纤维与棉纤维扩链形成大分子网状结构,再生聚酯长纤具备良好的吸湿性、耐酸碱性、耐热性和抗静电性,提升了废旧纤维制品纺丝再利用的前景。(The invention discloses a spinning process for preparing regenerated polyester long fibers from waste fiber products, and relates to the technical field of waste fiber regeneration. The spinning process comprises the steps of selecting waste polyester fiber products for pretreatment to obtain regenerated polyester fiber raw materials, selecting waste cotton fiber products for pretreatment to obtain regenerated cotton fiber raw materials, mixing the regenerated polyester fiber raw materials, the regenerated cotton fiber raw materials, a chain extender, cetyl phosphate and polyethylene glycol, heating and melting to obtain regenerated mixed polyester chips, spinning the regenerated mixed polyester chips, and performing after-treatment to obtain regenerated polyester long fibers; the spinning process utilizes wastes, and the polyester fibers and cotton fibers are chain-extended to form a macromolecular reticular structure under the chain extension action of the chain extender and the good moisture absorption performance of polyethylene glycol and the good antistatic property of hexadecyl phosphate, so that the regenerated polyester long fibers have good moisture absorption, acid and alkali resistance, heat resistance and antistatic property, and the spinning recycling prospect of waste fiber products is improved.)

1. A spinning process for preparing regenerated polyester long fibers from waste fiber products is characterized by comprising the following steps:

s1, pretreatment of waste polyester fiber products: selecting waste polyester fiber products, crushing, acid washing, primary filtering, ultrasonic cleaning, secondary filtering and drying to obtain a regenerated polyester fiber coarse material, and extruding the regenerated polyester fiber coarse material after melting to obtain a regenerated polyester fiber raw material;

s2, pretreating waste cotton fiber products: selecting waste cotton fiber products, crushing, sterilizing, pickling, filtering for the first time, cleaning by ultrasonic waves, filtering for the second time, and drying to obtain regenerated cotton fiber coarse materials, and extruding the regenerated cotton fiber coarse materials after the regenerated cotton fiber coarse materials are melted to obtain regenerated cotton fiber raw materials;

s3, chain extension and melting of regenerated polyester fibers and regenerated cotton fibers: mixing a regenerated polyester fiber raw material, a regenerated cotton fiber raw material, a chain extender, cetyl phosphate and polyethylene glycol, and heating and melting to obtain a regenerated mixed polyester slice;

s4, chip spinning and after finishing: spinning the regenerated mixed polyester chips at the spinning temperature of 280 +/-3 ℃, the spinning speed of 850-1100 m/min and the melt pressure of a spinning manifold of 3-4 MPa, and then finishing, namely obtaining the regenerated polyester filament through wet-heat drawing, washing, drying and winding.

2. The spinning process for preparing the regenerated polyester long fiber from the waste fiber products according to claim 1, wherein the waste polyester fiber products are selected from waste polyester cloth and waste polyester bottles, the intrinsic viscosity of the waste polyester cloth is 0.55-0.65 dl/g, the impurity content is more than or equal to 220mg/kg, and the water content is more than or equal to 2%; the intrinsic viscosity of the waste polyester bottle is 0.72-0.82 dl/g, the impurity content is more than or equal to 80mg/kg, and the water content is more than or equal to 1.5%.

3. The spinning process for preparing the regenerated polyester long fiber from the waste fiber products as claimed in claim 1, wherein the waste cotton fiber products are selected from waste cotton cloth, the cotton fiber content in the waste cotton cloth is 70% -80%, the polyester fiber content is 20% -30%, the impurity content is not less than 120mg/kg, and the water content is not less than 3%.

4. The spinning process for preparing the regenerated polyester long fiber from the waste fiber products as claimed in claim 1, wherein the chain extender is one or more selected from 1, 4-butanediol, ethylene glycol, propylene glycol and neopentyl glycol; the mass ratio of the regenerated polyester fiber raw material to the regenerated cotton fiber raw material to the chain extender to the cetyl phosphate ester salt to the polyethylene glycol is 1.8-2.2: 0.4-0.7: 0.6-0.9: 0.01-0.05: 0.1 to 0.3.

5. The spinning process for preparing the regenerated polyester filament fibers from the waste fiber products according to claim 1, wherein the wet-heat drawing multiple of the step S4 is 2.2-2.8; the water washing and drying uses clear water, the water washing temperature is 45 +/-3 ℃, and the drying temperature is 120 +/-3 ℃.

6. The spinning process for preparing the regenerated polyester long fibers from the waste fiber products as claimed in claim 1, wherein the processes of crushing, pickling, primary filtering, ultrasonic cleaning and secondary filtering of the waste polyester fiber products and the processes of crushing, sterilizing, pickling, primary filtering, ultrasonic cleaning and secondary filtering of the waste cotton fiber products are all completed by a preparation system for the regenerated polyester long fibers from the waste fiber products.

7. The spinning process for preparing the regenerated polyester long fibers from the waste fiber products is characterized in that the preparation system for the regenerated polyester long fibers from the waste fiber products comprises a crushing and pickling device (100), a spiral feeding and filtering device (200) and an ultrasonic cleaning and filtering device (300), wherein the bottom of the crushing and pickling device (100) is communicated with the top of one side of the spiral feeding and filtering device (200) through a first discharge pipe (400), and the wall of the other side of the spiral feeding and filtering device (200) is communicated with the top of the ultrasonic cleaning and filtering device (300) through a second discharge pipe (500).

8. The spinning process for preparing the regenerated polyester long fibers from the waste fiber products is characterized in that the crushing and pickling equipment (100) comprises a crushing and pickling tank (110), a primary grinding and crushing mechanism (120) is arranged above an inner cavity of the crushing and pickling tank (110), and a secondary stirring and crushing mechanism (130) is arranged below the primary grinding and crushing mechanism (120); the primary grinding and crushing mechanism (120) comprises a first speed reducing motor (121), a first grinding shaft (122), a first grinding roller (123), a second grinding shaft (141) and a second grinding roller (142), wherein the first speed reducing motor (121) is arranged on the outer side of the crushing and pickling tank (110) and is connected with the first grinding shaft (122) through a first coupler (124), the first grinding roller (123) is rotatably connected to the periphery of the first grinding shaft (122), and a plurality of circles of first grinding rollers (125) are radially and uniformly distributed on the periphery of the first grinding roller (123); the second grinding roller (142) is rotatably connected to the periphery of the second grinding shaft (141), and a plurality of rings of second grinding blades (143) are radially and uniformly distributed on the periphery of the second grinding roller (142); the first grinding shaft (122) and the second grinding shaft (141) are horizontally arranged, two ends of the second grinding shaft (141) are rotatably connected with the wall part of the crushing and pickling tank (110), the second grinding roller (142) is positioned below the first grinding roller (123), and each circle of second grinding roller (143) and the first grinding roller (125) are close to each other.

9. The spinning process for preparing the recycled polyester long fibers from the waste fiber products is characterized in that the spiral feeding filtering equipment (200) comprises a feeding box (210), one side of the feeding box (210) is connected with a third speed reducing motor (230) through a third coupler (220), the third coupler (220) is connected with a spiral flood dragon (240) arranged in an inner cavity of the feeding box (210), and a first filtering plate (250) is arranged on the same side of the feeding box (210) as that of the second discharging pipe (500).

10. The spinning process for preparing the regenerated polyester long fibers from the waste fiber products is characterized in that the ultrasonic cleaning and filtering equipment (300) comprises an ultrasonic box body (310), the bottom of the ultrasonic box body (310) is provided with a liquid outlet (311) and a plurality of ultrasonic transducers (312), the top of the ultrasonic box body (310) is opened, and a lifting and filtering mechanism is arranged in a cavity; the lifting filtering mechanism comprises a servo motor (313), a driving screw rod (314) and a second filtering plate (315), wherein the servo motor (313) is arranged at the top of the ultrasonic box body (310) and is rotationally connected with the driving screw rod (314) vertically extending into one side of the inner cavity of the ultrasonic box body (310), a driving bevel gear (316) is arranged on the driving screw rod (314) close to the servo motor (313), the driving bevel gear (316) is meshed with a first driven bevel gear (317), the first driven bevel gear (317) is connected with a second driven bevel gear (319) positioned on the other side of the inner cavity of the ultrasonic box body (310) through a connecting rod (318), the second driven bevel gear (319) is meshed with a third driven bevel gear (320), and the driven screw rod (321) vertically extends into the other side of the inner cavity of the ultrasonic box body (310) and then is rotationally connected with the third driven bevel gear (320); the bottom parts of the driving screw rod (314) and the driven screw rod (321) are respectively in threaded connection with a first nut seat (322) and a second nut seat (323), the peripheries of the first nut seat (322) and the second nut seat (323) are rotatably connected with sleeves (324), and a second filter plate (315) is connected between the peripheries of the two sleeves (324).

Technical Field

The invention relates to the technical field of waste fiber regeneration, in particular to a spinning process for preparing regenerated polyester long fibers from waste fiber products.

Background

At present, polyester waste textiles are recycled mainly by three process approaches of a physical method, a chemical method, a physical and chemical mixing method and the like. Among them, the liquid phase tackifying method adopted in the physical and chemical mixing method is widely concerned due to short process flow and low energy consumption. The polyester bottle chips can be directly melt-spun due to high intrinsic viscosity, but polyester waste textiles cannot be directly melt-spun for recycling due to low intrinsic viscosity, and the polyester waste textiles are complex in source and large in difference of color and intrinsic viscosity, so that great difficulty is brought to recycling of the waste textiles.

In the prior art, polyester waste textiles are used as raw materials, optimization development is carried out on the basis of the traditional cyclic recycling polyester bottle chip spinning process, the conditioning and viscosity regulation of waste polyester are realized by adopting a physical-chemical mixing method combining a free settling film forming reactor and a disc film forming reactor devolatilization device, various specifications of filling colored cyclic recycling polyester short fibers with similar spinning quality to polyester bottle chips are prepared, and certain reference is provided for recycling the polyester waste textiles. However, the process of regenerating polyester filament from waste fiber products is lacking, and the regenerated polyester filament cannot have good moisture absorption, acid and alkali resistance, heat resistance and antistatic property, and further research and improvement are needed.

Disclosure of Invention

The invention aims to provide a spinning process for preparing regenerated polyester long fibers from waste fiber products, which is used for solving the technical problem that the regenerated polyester long fibers cannot have good moisture absorption, acid and alkali resistance, heat resistance and antistatic property due to the lack of a process for preparing the regenerated polyester long fibers from the waste fiber products in the prior art.

The purpose of the invention can be realized by the following technical scheme:

a spinning process for preparing regenerated polyester long fibers from waste fiber products comprises the following steps:

s1, pretreatment of waste polyester fiber products: selecting waste polyester fiber products, crushing, acid washing, primary filtering, ultrasonic cleaning, secondary filtering and drying to obtain a regenerated polyester fiber coarse material, and extruding the regenerated polyester fiber coarse material after melting to obtain a regenerated polyester fiber raw material;

s2, pretreating waste cotton fiber products: selecting waste cotton fiber products, crushing, sterilizing, pickling, filtering for the first time, cleaning by ultrasonic waves, filtering for the second time, and drying to obtain regenerated cotton fiber coarse materials, and extruding the regenerated cotton fiber coarse materials after the regenerated cotton fiber coarse materials are melted to obtain regenerated cotton fiber raw materials;

s3, chain extension and melting of regenerated polyester fibers and regenerated cotton fibers: mixing a regenerated polyester fiber raw material, a regenerated cotton fiber raw material, a chain extender, cetyl phosphate and polyethylene glycol, and heating and melting to obtain a regenerated mixed polyester slice;

s4, chip spinning and after finishing: spinning the regenerated mixed polyester chips at the spinning temperature of 280 +/-3 ℃, the spinning speed of 850-1100 m/min and the melt pressure of a spinning manifold of 3-4 MPa, and then finishing, namely obtaining the regenerated polyester filament through wet-heat drawing, washing, drying and winding.

As a further preferable scheme of the invention, the waste polyester fiber product is selected from waste polyester cloth and waste polyester bottles, the intrinsic viscosity of the waste polyester cloth is 0.55-0.65 dl/g, the impurity content is more than or equal to 220mg/kg, and the water content is more than or equal to 2%; the intrinsic viscosity of the waste polyester bottle is 0.72-0.82 dl/g, the impurity content is more than or equal to 80mg/kg, and the water content is more than or equal to 1.5%.

As a further preferable scheme of the invention, the waste cotton fiber product is selected from waste cotton cloth, the cotton fiber content in the waste cotton cloth is 70-80%, the polyester fiber content is 20-30%, the impurity content is more than or equal to 120mg/kg, and the water content is more than or equal to 3%.

As a further preferred embodiment of the present invention, the chain extender is selected from one or more of 1, 4-butanediol, ethylene glycol, propylene glycol, neopentyl glycol; the mass ratio of the regenerated polyester fiber raw material to the regenerated cotton fiber raw material to the chain extender to the cetyl phosphate ester salt to the polyethylene glycol is 1.8-2.2: 0.4-0.7: 0.6-0.9: 0.01-0.05: 0.1 to 0.3.

In a further preferred embodiment of the present invention, the wet heat draft in step S4 is set to a multiple of 2.2 to 2.8; the water washing and drying uses clear water, the water washing temperature is 45 +/-3 ℃, and the drying temperature is 120 +/-3 ℃.

As a further preferable scheme of the present invention, the processes of crushing, pickling, primary filtering, ultrasonic cleaning and secondary filtering of the waste polyester fiber products and the processes of crushing, sterilizing, pickling, primary filtering, ultrasonic cleaning and secondary filtering of the waste cotton fiber products are all completed by a preparation system for the waste fiber products regenerated polyester long fibers.

As a further preferable scheme of the invention, the preparation system of the waste fiber product regenerated polyester long fiber comprises a crushing and pickling device, a spiral feeding and filtering device and an ultrasonic cleaning and filtering device, wherein the bottom of the crushing and pickling device is communicated with the top of one side of the spiral feeding and filtering device through a first discharging pipe, and the wall part of the other side of the spiral feeding and filtering device is communicated with the top of the ultrasonic cleaning and filtering device through a second discharging pipe.

As a further preferable scheme of the invention, the crushing and pickling equipment comprises a crushing and pickling tank, a primary grinding and crushing mechanism is arranged above an inner cavity of the crushing and pickling tank, and a secondary stirring and crushing mechanism is arranged below the primary grinding and crushing mechanism; the primary grinding and crushing mechanism comprises a first speed reducing motor, a first grinding shaft, a first grinding roller, a second grinding shaft and a second grinding roller, the first speed reducing motor is arranged on the outer side of the crushing and pickling tank and is connected with the first grinding shaft through a first coupler, the first grinding roller is rotatably connected to the periphery of the first grinding shaft, and a plurality of circles of first grinding rollers are radially and uniformly distributed on the periphery of the first grinding roller; the second grinding roller is rotatably connected to the periphery of the second grinding shaft, and a plurality of circles of second grinding knives are uniformly distributed on the periphery of the second grinding roller in the radial direction; the first grinding shaft and the second grinding shaft are horizontally arranged, two ends of the second grinding shaft are rotatably connected with the wall part of the crushing pickling tank, the second grinding roller is positioned below the first grinding roller, and each circle of second grinding roller is close to the first grinding roller.

As a further preferable scheme of the invention, the spiral feeding and filtering equipment comprises a feeding box, one side of the feeding box is connected with a third speed reduction motor through a third coupling, the third coupling is connected with a spiral auger arranged in the inner cavity of the feeding box, and a first filtering plate is arranged on the same side of the feeding box as the second discharging pipe.

As a further preferable scheme of the invention, the ultrasonic cleaning and filtering device comprises an ultrasonic box body, the bottom of the ultrasonic box body is provided with a liquid outlet and a plurality of ultrasonic transducers, the top of the ultrasonic box body is provided with an opening, and a lifting and filtering mechanism is arranged in a cavity; the lifting filtering mechanism comprises a servo motor, a driving screw and a second filtering plate, the servo motor is arranged at the top of the ultrasonic box body and is in rotating connection with the driving screw vertically extending into one side of the inner cavity of the ultrasonic box body, a driving bevel gear is arranged on the driving screw close to the servo motor, the driving bevel gear is meshed with a first driven bevel gear, the first driven bevel gear is connected with a second driven bevel gear positioned on the other side of the inner cavity of the ultrasonic box body through a connecting rod, the second driven bevel gear is meshed with a third driven bevel gear, and the driven screw vertically extends into the other side of the inner cavity of the ultrasonic box body and is then in rotating connection with the third driven bevel gear; the bottom of the driving screw and the bottom of the driven screw are respectively in threaded connection with a first nut seat and a second nut seat, the peripheries of the first nut seat and the second nut seat are rotatably connected with sleeves, and a second filter plate is connected between the peripheries of the two sleeves.

The invention has the following beneficial effects:

1. the invention relates to a spinning process for preparing regenerated polyester long fibers from waste fiber products, which comprises the steps of selecting waste polyester fiber products for pretreatment to obtain regenerated polyester fiber raw materials, selecting waste cotton fiber products for pretreatment to obtain regenerated cotton fiber raw materials, mixing the regenerated polyester fiber raw materials, the regenerated cotton fiber raw materials, a chain extender, cetyl phosphate and polyethylene glycol, heating and melting to obtain regenerated mixed polyester chips, spinning the regenerated mixed polyester chips, and performing after-treatment to obtain the regenerated polyester long fibers; according to the spinning process, waste polyester fiber products and cotton fiber products are subjected to waste utilization, the cotton fibers have good hygroscopicity, acid and alkali resistance and heat resistance, the good hygroscopicity of polyethylene glycol is matched through the chain extension effect of the chain extender, and the good antistatic property of cetyl phosphate salt is matched, so that the polyester fibers and the cotton fiber chains are extended to form a macromolecular net structure, the regenerated polyester long fibers have good hygroscopicity, acid and alkali resistance, heat resistance and antistatic property, and the spinning recycling prospect of the waste fiber products is improved.

2. The preparation system is used for the processes of crushing, pickling, primary filtering, ultrasonic cleaning and secondary filtering of waste polyester fiber products and the processes of crushing, sterilizing, pickling, primary filtering, ultrasonic cleaning and secondary filtering of waste cotton fiber products through the preparation system of the waste polyester long fibers of the waste fiber products, and efficiently crushing the waste fiber products to obtain crushed waste polyester fiber products and crushed waste cotton fiber products with uniform particle sizes; the two-time filtration is matched with the ultrasonic cleaning process, so that large-particle impurities can be efficiently removed, bubbles are formed and are rapidly imploded based on the cavitation, the generated impact force peels off dirt on the surfaces of the waste polyester fibers and the waste cotton fibers, and small-particle dirt on the inner and outer surfaces is removed; the preparation system can achieve good crushing, cleaning and impurity removing effects, and the quality of the regenerated polyester long fiber product is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a spinning process for preparing a regenerated polyester filament fiber from waste fiber products according to the invention;

FIG. 2 is a schematic structural diagram of a system for preparing long polyester fibers from waste fiber products according to the present invention;

FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 2;

FIG. 4 is a schematic view of the structure of the primary grinding and pulverizing mechanism of the present invention;

FIG. 5 is a side view of a mating arrangement of a first grinding roll and a second grinding roll of the present invention;

FIG. 6 is a schematic structural view of a secondary stirring and pulverizing mechanism of the present invention;

FIG. 7 is a schematic structural view of a spiral feed filtration apparatus of the present invention;

fig. 8 is a schematic structural view of the ultrasonic cleaning and filtering apparatus of the present invention.

Reference numerals: 100. crushing and pickling equipment; 110. a crushing pickling tank; 120. a primary grinding and crushing mechanism; 121. a first reduction motor; 122. a first grinding shaft; 123. a first grinding roller; 124. a first coupling; 125. first grinding and sharpening; 130. a secondary stirring and crushing mechanism; 131. a second reduction motor; 132. a stirring shaft; 133. a second coupling; 134. crushing the leaves; 135. a fine crushing knife; 141. a second grinding shaft; 142. a second grinding roller; 143. secondly, grinding and sharpening the knife; 150. a material returning pipe; 151. a lift pump; 152. a material return pipe; 153. a one-way valve; 154. a feed hopper; 161. an acid liquid tank; 162. a sterilizing liquid tank; 163. a first liquid inlet pipe; 164. a delivery pipe; 165. a second liquid inlet pipe; 166. a first regulating valve; 167. a second regulating valve; 168. installing a sleeve; 169. a sprinkler head; 200. a spiral feed filtration device; 210. a feeding box; 220. a third coupling; 230. a third reduction motor; 240. a spiral flood dragon; 250. a first filter plate; 300. ultrasonically cleaning the filtering equipment; 310. an ultrasonic box body; 311. a liquid discharge port; 312. an ultrasonic transducer; 313. a servo motor; 314. a driving screw; 315. a second filter plate; 316. a drive bevel gear; 317. a first driven bevel gear; 318. a connecting rod; 319. a second driven bevel gear; 320. a third driven bevel gear; 321. a driven screw; 322. a first nut seat; 323. a second nut seat; 324. a sleeve; 400. a first discharging pipe; 500. a second discharge conduit.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, this embodiment provides a spinning process for preparing a recycled polyester filament from waste fiber products, which includes the following steps:

s1, pretreatment of waste polyester fiber products: selecting waste polyester fiber products, crushing, acid washing, primary filtering, ultrasonic cleaning, secondary filtering and drying to obtain a regenerated polyester fiber coarse material, and extruding the regenerated polyester fiber coarse material after melting to obtain a regenerated polyester fiber raw material; the waste polyester fiber product is selected from waste polyester cloth and waste polyester bottles, the intrinsic viscosity of the waste polyester cloth is 0.55-0.65 dl/g, the impurity content is more than or equal to 220mg/kg, and the water content is more than or equal to 2%; the intrinsic viscosity of the waste polyester bottle is 0.72-0.82 dl/g, the impurity content is more than or equal to 80mg/kg, and the water content is more than or equal to 1.5%.

S2, pretreating waste cotton fiber products: selecting waste cotton fiber products, crushing, sterilizing, pickling, filtering for the first time, cleaning by ultrasonic waves, filtering for the second time, and drying to obtain regenerated cotton fiber coarse materials, and extruding the regenerated cotton fiber coarse materials after the regenerated cotton fiber coarse materials are melted to obtain regenerated cotton fiber raw materials; the waste cotton fiber product is selected from waste cotton cloth, wherein the cotton fiber content in the waste cotton cloth is 70% -80%, the polyester fiber content is 20% -30%, the impurity content is not less than 120mg/kg, and the water content is not less than 3%.

S3, chain extension and melting of regenerated polyester fibers and regenerated cotton fibers: mixing a regenerated polyester fiber raw material, a regenerated cotton fiber raw material, a chain extender, cetyl phosphate and polyethylene glycol, and heating and melting to obtain a regenerated mixed polyester slice; the chain extender is selected from 1, 4-butanediol; the mass ratio of the regenerated polyester fiber raw material to the regenerated cotton fiber raw material to the chain extender to the cetyl phosphate ester salt to the polyethylene glycol is 2.1:0.6:0.8:0.04: 0.2.

S4, chip spinning: chip spinning and after finishing: spinning the regenerated mixed polyester chips at the spinning temperature of 280 +/-3 ℃, the spinning speed of 850-1100 m/min and the melt pressure of a spinning manifold of 3-4 MPa, and then finishing, namely obtaining the regenerated polyester filament through wet-heat drawing, washing, drying and winding. The multiple of the wet heat drafting is 2.6; the water washing and drying are carried out by using clear water, the water washing temperature is 46 ℃, and the drying temperature is 120 ℃.

Example 2

As shown in fig. 1, the spinning process for preparing the recycled polyester filament fibers from the waste fiber products provided in this embodiment is different from that of embodiment 1 in that the step S3 is performed by selecting the chain extender from ethylene glycol; the mass ratio of the regenerated polyester fiber raw material to the regenerated cotton fiber raw material to the chain extender to the cetyl phosphate ester salt to the polyethylene glycol is 1.9:0.6:0.8: 0.03: 0.25; the wet heat drafting multiple is 2.5; the water washing and drying are carried out by using clean water, the water washing temperature is 44 ℃, and the drying temperature is 122 ℃.

Example 3

As shown in fig. 1, the spinning process for preparing the recycled polyester filament fibers from the waste fiber products provided in this embodiment is different from that of embodiment 1 in that the chain extender of step S3 is selected from neopentyl glycol; the mass ratio of the regenerated polyester fiber raw material to the regenerated cotton fiber raw material to the chain extender to the cetyl phosphate ester salt to the polyethylene glycol is 2:0.6:0.78:0.025: 0.18; the multiple of the wet heat drafting is 2.4; the water washing and drying are carried out by using clear water, the water washing temperature is 47 ℃, and the drying temperature is 118 ℃.

Performance testing

The recycled polyester long fiber prepared in the embodiment 1-3 is subjected to a performance test, and the volume specific resistance reaches 1.8-2.2 multiplied by 10⁸Omega cm, the moisture regain of 60 percent of relative humidity reaches 1.28-1.39 percent, the breaking strength reaches 5.63-5.82 cN/dtex, and the antistatic property, the moisture absorption and the breaking strength are excellent.

Example 4

As shown in fig. 2, this embodiment provides a system for preparing recycled polyester filament from waste fiber products, which is used to complete the steps of crushing, pickling, primary filtering, ultrasonic cleaning, and secondary filtering of the waste polyester fiber products, and the steps of crushing, sterilizing, pickling, primary filtering, ultrasonic cleaning, and secondary filtering of the waste cotton fiber products in the spinning processes of the foregoing embodiments 1 to 3, and efficiently crush the waste fiber products to obtain crushed waste polyester fiber products and crushed waste cotton fiber products with uniform particle sizes; the two-time filtration is matched with the ultrasonic cleaning process, large-particle impurities can be removed efficiently, bubbles are formed and are rapidly imploded based on the cavitation, the generated impact force peels off dirt on the surfaces of the waste polyester fibers and the waste cotton fibers, and small-particle dirt on the inner and outer surfaces is removed.

The preparation system of the waste fiber product regenerated polyester long fiber comprises a crushing and pickling device 100, a spiral feeding and filtering device 200 and an ultrasonic cleaning and filtering device 300, wherein the bottom of the crushing and pickling device 100 is communicated with the top of one side of the spiral feeding and filtering device 200 through a first discharging pipe 400, and the wall part of the other side of the spiral feeding and filtering device 200 is communicated with the top of the ultrasonic cleaning and filtering device 300 through a second discharging pipe 500.

Specifically, as shown in fig. 2 to 6, the crushing and pickling apparatus 100 includes a crushing and pickling tank 110, a primary milling and crushing mechanism 120 is disposed above an inner cavity of the crushing and pickling tank 110, and a secondary stirring and crushing mechanism 130 is disposed below the primary milling and crushing mechanism 120; the primary grinding and crushing mechanism 120 comprises a first speed reducing motor 121, a first grinding shaft 122, a first grinding roller 123, a second grinding shaft 141 and a second grinding roller 142, wherein the first speed reducing motor 121 is arranged on the outer side of the crushing and pickling tank 110 and is connected with the first grinding shaft 122 through a first coupler 124, the first grinding roller 123 is rotatably connected to the periphery of the first grinding shaft 122, and a plurality of rings of first grinding rollers 125 are radially and uniformly distributed on the periphery of the first grinding roller 123; the second grinding roll 142 is rotatably connected to the periphery of the second grinding shaft 141, and a plurality of rings of second grinding rolls 143 are radially and uniformly distributed on the periphery of the second grinding roll 142; the first grinding shaft 122 and the second grinding shaft 141 are horizontally arranged, two ends of the second grinding shaft 141 are rotatably connected with the wall part of the crushing and pickling tank 110, the second grinding roller 142 is positioned below the first grinding roller 123, each circle of the second grinding cutter 143 and the first grinding cutter 125 are close to each other, and the distance between the adjacent second grinding cutter 143 and the first grinding cutter 125 is 0.5-2 mm; the second grinding blade 143 and the first grinding blade 125 have a length of 6 to 12 cm.

After the waste polyester fiber products or the waste cotton fiber products are added, the first speed reducing motor 121 is started, the first speed reducing motor 121 drives the first grinding shaft 122 to rotate, and the first grinding shaft 122 drives the first grinding roller 123 and the first grinding cutter 125 to rotate; first grinding sword 125 cuts old and useless polyester fiber goods or old and useless cotton fiber goods and smashes, when the cutting crushing material produces the extrusion to second grinding sword 143, the extrusion force promotes second grinding roller 142 and rotates around second grinding axle 141, and first grinding sword 125 and the cooperation of second grinding sword 143 carry out more compact crushing to the cutting crushing material and mill, obtain the crushing material once.

The secondary stirring and crushing mechanism 130 comprises a second speed reducing motor 131 and a stirring shaft 132, the second speed reducing motor 131 is positioned at the bottom of the crushing and pickling tank 110 and is connected with the stirring shaft 132 extending into the inner cavity of the crushing and pickling tank 110 through a second coupler 133, and a plurality of groups of crushing blades 134 are symmetrically arranged in the radial direction of the stirring shaft 132; the crushing blades 134 are of arc-shaped structures which are bent upwards from inside to outside, the upper surfaces of the crushing blades 134 are provided with a plurality of fine crushing knives 135, the distance between the upper and lower adjacent crushing blades 134 is 8-15 cm, the height of each fine crushing knife 135 is 1-3 cm, and the distance between the adjacent fine crushing knives 135 is 1-5 cm.

The secondary stirring and crushing mechanism 130 is arranged, so that after the primary crushing material falls under the action of gravity, the second speed reduction motor 131 is started, the second speed reduction motor 131 drives the stirring shaft 132 and the crushing blade 134 to rotate through the second coupler 133, and the primary crushing material is further sheared and crushed to obtain the secondary crushing material with smaller particle size due to the shearing force generated by the crushing blade 134 and the fine crushing knife 135 to the primary crushing material.

The top of the crushing pickling tank 110 is provided with a sterilizing liquid acid conveying mechanism, the sterilizing liquid acid conveying mechanism comprises an acid liquid tank 161 and a sterilizing liquid tank 162, the acid liquid tank 161 is communicated with a conveying pipe 164 extending into the crushing pickling tank 110 through a first liquid inlet pipe 163, the sterilizing liquid tank 162 is communicated with the conveying pipe 164 through a second liquid inlet pipe 165, and the first liquid inlet pipe 163 and the second liquid inlet pipe 165 are respectively provided with a first regulating valve 166 and a second regulating valve 167; the delivery pipe 164 is connected with the top wall of the inner cavity of the crushing and pickling tank 110 through a plurality of mounting sleeves 168, and a plurality of spray heads 169 facing the first grinding roller 123 are arranged below the delivery pipe 164; the pickling solution tank 161 contains pickling solution, and the sterilizing solution tank 162 contains sterilizing solution. In the embodiment, glacial acetic acid with the concentration of 0.3-0.5 g/L is preferably selected as the pickling solution, and a colorless transparent nano silver solution with the effective component content of 1000-3000 ppm is preferably selected as the sterilization solution.

The sterilizing liquid acid conveying mechanism is arranged, after the first adjusting valve 166 is opened, acid washing liquid in the acid liquor box 161 is conveyed through the first liquid inlet pipe 163 and the conveying pipe 164 and then sprayed out from the spraying head 169, and is mixed with crushed materials for acid washing; after the second adjusting valve 167 is opened, the sterilization liquid in the sterilization liquid tank 162 is delivered through the second liquid inlet pipe 165 and the delivery pipe 164 and then sprayed out from the spraying head 169, and is mixed with the crushed materials for sterilization; the crushed material is convenient to be pickled and sterilized.

The bottom of the crushing and pickling tank 110 is connected with the input end of a lifting pump 151 through a return pipe 150, the output end of the lifting pump 151 is communicated with the top side wall of the crushing and pickling tank 110 through a return pipe 152, and a one-way valve 153 is arranged on the path of the return pipe 150; the crushing and pickling tank 110 is provided with a feed hopper 154 at one side top thereof. After the check valve 153 and the lift pump 151 are opened, the pickling solution or the sterilizing solution of the crushed materials can return to the crushing pickling tank 110 along the material return pipe 150 and the material return pipe 152 to be further mixed and crushed, so that the pickling and the sterilization are more sufficient, and the crushed materials with more fine and uniform particle sizes are obtained.

As shown in fig. 1 and 7, the spiral feeding and filtering apparatus 200 includes a feeding box 210, one side of the feeding box 210 is connected to a third speed reduction motor 230 through a third coupling 220, the third coupling 220 is connected to a spiral auger 240 disposed in an inner cavity of the feeding box 210, and a first filtering plate 250 is mounted on the same side of the feeding box 210 as that of a second discharging pipe 500; the diameter of the filter holes of the first filter plate 250 is 1 to 3 mm. Spiral feeding filtration equipment 200's setting starts third gear motor 230 after, and third gear motor 230 drives spiral flood dragon 240 through third shaft coupling 220 and rotates, carries out the auger delivery with the mixed liquid of secondary crushing material and pickle or the liquid of disinfecting, and after the filtration of first filter 250, in the large granule impurity got into ultrasonic cleaning filtration equipment 300 after the filtering, makes things convenient for the transport and the filtration of mixture.

As shown in fig. 1 and 8, the ultrasonic cleaning and filtering device 300 includes an ultrasonic box 310, a liquid outlet 311 and a plurality of ultrasonic transducers 312 are provided at the bottom of the ultrasonic box 310, the top of the ultrasonic box 310 is open, and a lifting and filtering mechanism is provided in the cavity; the lifting filtering mechanism comprises a servo motor 313, a driving screw 314 and a second filtering plate 315, wherein the servo motor 313 is arranged at the top of the ultrasonic box 310 and is rotationally connected with the driving screw 314 vertically extending into one side of the inner cavity of the ultrasonic box 310, a driving bevel gear 316 is arranged on the driving screw 314 close to the servo motor 313, the driving bevel gear 316 is meshed with a first driven bevel gear 317, the first driven bevel gear 317 is connected with a second driven bevel gear 319 positioned at the other side of the inner cavity of the ultrasonic box 310 through a connecting rod 318, the second driven bevel gear 319 is meshed with a third driven bevel gear 320, and the driven screw 321 vertically extends into the other side of the inner cavity of the ultrasonic box 310 and is rotationally connected with the third driven bevel gear 320; the bottom parts of the driving screw 314 and the driven screw 321 are respectively in threaded connection with a first nut seat 322 and a second nut seat 323, the peripheries of the first nut seat 322 and the second nut seat 323 are rotatably connected with sleeves 324, a second filter plate 315 is connected between the peripheries of the two sleeves 324, and the diameter of a filter hole of the second filter plate 315 is 0.1-0.5 mm.

By arranging the lifting filtering mechanism in the ultrasonic box body 310, when the plurality of ultrasonic transducers 312 convert the sound energy of the power ultrasonic frequency source into mechanical vibration, the ultrasonic waves are radiated into the ultrasonic box body 310 and are radiated by the ultrasonic waves, so that micro bubbles in the mixed liquid can keep vibrating under the action of the sound waves, the adsorption of dirt and the fiber surface is damaged, and the dirt layer is stripped due to fatigue damage; when the servo motor 313 is started, the servo motor 313 drives the driving screw 314 to rotate, the driving bevel gear 316 rotates along with the driving bevel gear and drives the first driven bevel gear 317 to rotate, the connecting rod 318 and the second driven bevel gear 319 further rotate, the second driven bevel gear 319 drives the third driven bevel gear 320 meshed with the second driven bevel gear to rotate, the third driven bevel gear 320 drives the driven screw 321 to rotate, so that the first nut seat 322 and the second nut seat 323 keep relatively consistent up-and-down movement, and the sleeve 324 and the second filter plate 315 also move up-and-down along with the first nut seat 322 and the second nut seat 323; after the ultrasonic cleaning is finished, the second filter plate 315 moves upwards to the mixed liquid level, and the wet coarse material of the regenerated polyester fiber and the cotton fiber is intercepted on the second filter plate 315, so that the collection and the drying are convenient and centralized.

The working method of the system for preparing the waste fiber product regenerated polyester long fiber comprises the following steps:

(1) adding waste polyester fiber products or waste cotton fiber products from the feed hopper 154, starting the first speed reducing motor 121, driving the first grinding shaft 122 to rotate by the first speed reducing motor 121, and driving the first grinding roller 123 and the first grinding blade 125 to rotate by the first grinding shaft 122; the first grinding cutter 125 cuts and crushes the waste polyester fiber products or the waste cotton fiber products, when the cutting crushed materials extrude the second grinding cutter 143, the extrusion force promotes the second grinding roller 142 to rotate around the second grinding shaft 141, and the first grinding cutter 125 and the second grinding cutter 143 are matched to crush and grind the cutting crushed materials more compactly, so that primary crushed materials are obtained;

(2) after the primary crushed material falls under the action of gravity, a second speed reducing motor 131 is started, the second speed reducing motor 131 drives a stirring shaft 132 and a crushing blade 134 to rotate through a second coupler 133, and the primary crushed material is further sheared and crushed to obtain secondary crushed material with smaller particle size due to shearing force generated by the crushing blade 134 and a fine crushing knife 135 on the primary crushed material;

(3) when acid washing and sterilization are needed, the first regulating valve 166 is opened, acid washing liquid in the acid liquor tank 161 is sprayed out from the spraying head 169 after being conveyed by the first liquid inlet pipe 163 and the conveying pipe 164, and is mixed with crushed materials for acid washing; the second regulating valve 167 is opened, the sterilization liquid in the sterilization liquid box 162 is sprayed out from the spraying head 169 after being conveyed by the second liquid inlet pipe 165 and the conveying pipe 164, and is mixed with the crushed materials for sterilization;

(4) starting the third speed reducing motor 230, driving the spiral auger 240 to rotate by the third speed reducing motor 230 through the third coupler 220, spirally conveying the mixed liquid of the secondary crushed material and the pickling solution or the sterilizing solution, filtering by the first filter plate 250, and filtering large-particle impurities to remove the large-particle impurities, and then feeding the large-particle impurities into the ultrasonic cleaning and filtering device 300;

(5) the ultrasonic transducers 312 convert the sound energy of the power ultrasonic frequency source into mechanical vibration, the ultrasonic waves are radiated into the ultrasonic box body 310 and are radiated by the ultrasonic waves, so that micro bubbles in the mixed liquid can keep vibrating under the action of the sound waves, the adsorption of dirt and the fiber surface is damaged, and the dirt layer is damaged by fatigue and is peeled off; the second filter plate 315 moves upward to the mixed liquid level, and the wet coarse material of the regenerated polyester fiber and the cotton fiber can be retained on the second filter plate 315, so that the collection and drying are convenient.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.