Two-component elastic nylon yarn and method for producing same

Abstract

The application discloses a kind of two-component elastic nylon yarn and preparation method thereof, wherein, a kind of two-component elastic nylon yarn preparation method includes the following steps: using discarded fishing net or plastic mineral water bottle as raw material to prepare low-viscosity regenerated nylon chip, corn, straw starch raw material is prepared by biosynthesis method to obtain high-viscosity biobased nylon chip;The regenerated nylon chip and biobased nylon chip obtained by preparation are mixed according to predetermined proportion, and finishing agent is added under heating melting state;POY bobbin silk semi-finished product is spun;POY bobbin silk semi-finished product is drawn, wound and elastic appearance treatment, and finally DTY two-component nylon yarn is obtained.The application provides a kind of two-component elastic nylon yarn and preparation method thereof, the preparation method is compounded spinning using environment-friendly regenerated raw material, and the prepared nylon yarn is excellent, durable, has good cotton-like effect and environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, in particular to a dual-component elastic nylon yarn and a preparation method thereof. BACKGROUND

[0002] Nylon yarn, as a widely used synthetic fiber, is favored for its excellent wear resistance, wrinkle resistance and strength. However, traditional nylon yarn has obvious shortcomings in elasticity. In order to improve the elasticity of nylon yarn to meet the increasing market demand for materials with high elasticity, such as sportswear, outdoor equipment and underwear, the industry generally adopts post-spinning elastic process or covers with spandex to achieve it. The post-spinning elastic process is to make nylon yarn form a coiled structure similar to a spring through heat setting and mechanical stretching in the spinning process, so as to obtain a certain elasticity. However, the coiled structure formed by this method is often uneven, and in the use process, especially after multiple washes, the coiling will gradually be straightened, causing the yarn to gradually lose elasticity, which seriously affects the service life and user experience of the product. Another common method is nylon covering spandex, which is to use the high elasticity of spandex to composite with nylon. Spandex is a block copolymer composed of soft segments and hard segments, and its elasticity comes from the phase separation structure between the soft segments and the hard segments. However, spandex also has the problem of decreased elasticity after long-term use and multiple washes, i.e. the "loss of elasticity" phenomenon. This is mainly because the molecular chains of spandex may be broken or rearranged during repeated stretching and recovery, resulting in a decrease in elasticity. In summary, the existing elasticity improvement technology of nylon yarn has certain limitations, especially in the durability of yarn elasticity. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects or problems in the background art, and provides a dual-component elastic nylon yarn and a preparation method thereof. The preparation method uses environmentally friendly recycled raw materials for composite spinning, and the obtained nylon yarn has excellent and durable elasticity, good cotton-like effect and environmental protection.

[0004] To achieve the above-mentioned purpose, each embodiment of the present application adopts the following technical solution, but is not limited to the following solution:

[0005] The first technical solution relates to a preparation method of a two-component elastic nylon yarn, comprising the following steps: using discarded fishing nets or plastic mineral water bottles as raw materials, and preparing regenerated nylon chips with a weight average molecular chain of 300KDa-500KDa, an average particle size of 7 microns-9 microns, and a viscosity of 0.6mps-0.9mps through pretreatment and processing; using corn, straw and other starchy raw materials, and preparing bio-based nylon chips with a weight average molecular chain of 600KDa-700KDa, an average particle size of 6 microns-9 microns, and a viscosity of 1.2mps-1.5mps through biosynthesis; mixing the regenerated nylon chips and the bio-based nylon chips according to a predetermined ratio, and adding a finishing agent in a heated and molten state; spinning to form POY bobbin yarn semi-finished products; and performing drafting, winding and elastic appearance treatment on the POY bobbin yarn semi-finished products to finally obtain DTY two-component nylon yarn.

[0006] The second technical solution is based on the first technical solution, wherein the regenerated nylon chips are prepared by recycling discarded fishing nets or plastic mineral water bottles, and adding a thickening agent for viscosity increasing treatment to obtain nylon monomer 6 chips.

[0007] The third technical solution is based on the second technical solution, wherein the preparation of the regenerated nylon chips comprises the following steps: S1, pretreatment: recycling and cleaning discarded fishing nets or plastic mineral water bottles, crushing to a particle size of 18mm-20mm of regenerated nylon chip bottle pieces, and further cleaning, drying and color separation treatment; S2, pulping: placing the regenerated nylon chip bottle pieces into an esterification kettle, adding an acrylic ester type thickening agent under normal pressure nitrogen protection, stirring and reacting at a temperature of 100℃-270℃ for 1-4 hours to obtain regenerated nylon transparent liquid; S3, slicing: sending the regenerated nylon transparent liquid into a reaction double-screw rod for underwater granulation at a reaction temperature of 130℃-180℃, and then drying and packaging to obtain regenerated nylon chips.

[0008] The fourth technical solution is based on the first technical solution, wherein the preparation of the bio-based nylon chips uses bio-based pentanediamine and petroleum-based adipic acid as raw materials, bio-based pentanediamine is prepared by microbial fermentation method, and bio-based nylon monomer 6 chips are obtained by polycondensation reaction of bio-based pentanediamine and petroleum-based adipic acid under stirring and catalysis conditions.

[0009] The fifth technical solution is based on the fourth technical solution, wherein the preparation of the bio-based nylon chip comprises the following steps: S1, starch dissolving: crushing corn, straw starch raw materials, and mixing with water to form a starch solution; S2, saccharification and fermentation: adding saccharifying enzyme 2g / L-10g / L to the starch solution for fermentation to prepare a saccharified solution; S3, aerobic fermentation: performing aerobic fermentation on the saccharified solution under constant temperature conditions to obtain a glycerol fermentation liquor; wherein the fermentation temperature is 42-45°C, the fermentation time is 48-72 hours, and stirring is performed every 4 hours for 5 minutes; S4, anaerobic fermentation: filtering the glycerol fermentation liquor, transferring it into an anaerobic fermentation tank, adding Corynebacterium glutamicum 5g / L-10g / L, and performing anaerobic fermentation under constant temperature conditions, the fermentation temperature is 42-45°C, the fermentation time is 72-108 hours, and a pentanediamine liquid is obtained; S4, polymerization reaction: mixing the pentanediamine liquid with adipic acid according to a molar ratio of 2:1.2-2:1.5, adding an acrylic ester type thickening agent, stirring and reacting at a temperature of 150-270°C for 2-4 hours, while condensing and discharging the generated water, to obtain a bio-based nylon liquid; S5, slicing: sending the bio-based nylon liquid into a reaction double-screw rod for underwater granulation at a reaction temperature of 160-200°C, and then drying and packaging to obtain bio-based nylon chips.

[0010] The sixth technical solution is based on the first technical solution, wherein the components of the regenerated nylon chip, the bio-based nylon chip, and the finishing agent are in a mass percentage ratio of: regenerated nylon chip 40%-60%, bio-based nylon chip 40%-60%, antistatic agent 0.5%-2%, antioxidant 0.1%-0.5%, lubricant 0.1%-1%, and thickening agent 2%-4%.

[0011] The seventh technical solution is based on the sixth technical solution, wherein the weight ratio of the mixed regenerated nylon chip and bio-based nylon chip is 60:40.

[0012] The eighth technical solution is based on the first technical solution, wherein the heating and melting adopts a double-screw extruder, wherein the heating and melting temperature of the regenerated nylon chip is 230-270°C, and the heating and melting temperature of the bio-based nylon chip is 200-250°C.

[0013] The ninth technical solution is based on any one of the first to eighth technical solutions, wherein a two-component elastic nylon yarn is prepared by the above-mentioned method for preparing a two-component elastic nylon yarn.

[0014] From the above description of the various embodiments of the present application, it can be seen that, compared with the prior art, the various embodiments of the present application have the following advantages

[0015] Advantages:

[0016] In the first technical solution and related embodiments, the preparation method uses discarded fishing nets and plastic mineral water bottles as raw materials for recycled nylon chips, promoting the recycling of plastic waste and reducing environmental pollution. The use of corn, straw and other starchy materials to synthesize bio-based nylon chips reduces dependence on petroleum resources. By mixing low-viscosity recycled nylon chips with high-viscosity bio-based nylon chips, the differences in viscosity and molecular chain length between them are utilized to optimize the performance of nylon yarn. This dual-component design enables the final product, DTY dual-component nylon yarn, to exhibit excellent elasticity, meeting market demand for high-performance nylon yarn.

[0017] In the second technical solution and related embodiments, discarded fishing nets and plastic mineral water bottles are common plastic waste. By recycling these materials and converting them into nylon 6 chips, not only is the environmental pollution caused by plastic garbage reduced, but resource recycling is also achieved. Although the recycled nylon chips are derived from waste, the addition of a thickening agent for viscosity enhancement can adjust their viscosity and molecular chain length, making them more compatible with bio-based nylon chips in terms of physical and chemical properties. This dual-component design can significantly enhance the elasticity of nylon yarn and improve the overall performance of the product.

[0018] In the third technical solution and related embodiments, the entire preparation process realizes the conversion from waste to high-quality recycled nylon chips, reducing production costs and promoting resource recycling and environmental sustainability. The prepared recycled nylon chips have stable physical and chemical properties, allowing them to be mixed and spun with bio-based nylon chips to produce dual-component elastic nylon yarn with excellent performance.

[0019] In the fourth technical solution and related embodiments, the use of bio-based pentanediamine instead of part or all of petroleum-based raw materials reduces dependence on petroleum resources and reduces negative environmental impacts.

[0020] In the fifth technical solution and related embodiments, the preparation method utilizes renewable natural resources, employs microbial fermentation, and adds acrylic ester type thickening agents to produce high-viscosity bio-based nylon chips. The use of corn, straw and other renewable natural resources as raw materials reduces dependence on fossil fuels. Microbial fermentation, as a biological conversion technology, has lower energy consumption and less waste generation compared to traditional chemical synthesis methods, further enhancing environmental benefits. The addition of acrylic ester type thickening agents during the polymerization reaction can adjust the viscosity of bio-based nylon liquid, making it reach a high-viscosity state, and exhibit better flowability and fiber-forming properties in subsequent processing, which is beneficial for forming uniform and stable fiber structures.

[0021] In the sixth technical solution and related embodiments, by controlling the proportion of recycled nylon chips and bio-based nylon chips, the balance of the performance of the dual-component material is ensured. At the same time, by adding finishing agents such as antistatic agents, antioxidants, lubricants and thickening agents, the antistatic performance, oxidation resistance, processing performance and yarn elasticity of the yarn are further improved.

[0022] In the seventh technical solution and related embodiments, by setting the ratio of recycled nylon chips and bio-based nylon chips after mixing, it is helpful to form a more uniform and stable spiral structure in the spinning process, and to give the yarn more excellent elasticity.

[0023] In the eighth technical solution and related embodiments, a double-screw extruder is used, so that the recycled nylon chips and bio-based nylon chips can be fully mixed in a molten state, thereby realizing uniform distribution of the two materials.

[0024] In the ninth technical solution and related embodiments, the dual-component elastic nylon yarn is prepared by using bio-based raw materials and recycled raw materials, and a thickening agent is added, which realizes the optimization of product performance and the improvement of environmental value. The final product has good physical properties and environmental characteristics. By adding a thickening agent to the bio-based nylon chips and recycled nylon chips, the elasticity of the final product is effectively enhanced, and the dual-component nylon yarn has high elastic recovery performance. The dual-component elastic nylon yarn has excellent shaping effect, can maintain fiber softness while providing good support and shape retention ability. The product also has the characteristics of dryness and crispness, so that the textile products made are more comfortable and breathable during wearing, and have good wearing experience. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 The structure schematic diagram of the dual-component elastic nylon yarn of the embodiment is shown in the figure.

[0027] Figure 2 The comparative schematic diagram of the environment-friendly dual-component elastic nylon and ordinary nylon of the embodiment is shown in the figure. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are the preferred embodiments of the present application, and should not be seen as excluding other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] In the claims, the specification, and the drawings of the present application, unless otherwise clearly indicated, the use of the terms "first", "second", or "third" etc. is not to be construed as implying a particular order among the objects, but is merely intended to distinguish different objects.

[0030] In the claims, the specification, and the drawings of the present application, unless otherwise clearly indicated, the use of terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise" etc. indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.

[0031] In the claims, the specification, and the drawings of the present application, unless otherwise clearly indicated, the use of terms such as "fixedly connected" or "fixedly connected" should be understood broadly, that is, any connection mode between the two without displacement relationship and relative rotation relationship, that is, it includes irremovable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0032] In the claims, the specification, and the drawings of the present application, the use of terms such as "include", "have" and their variants is intended to mean "include but not limited to".

[0033] Referring to Figure 1 and Figure 2 such as Figure 1 and Figure 2As shown, a method for preparing a two-component elastic nylon yarn includes the following steps: using discarded fishing nets or plastic mineral water bottles as raw materials, after pretreatment and processing, a regenerated nylon chip with a weight average molecular chain of 300KDa-500KDa, an average particle size of 7-9 microns, and a viscosity of 0.6-0.9 mps is prepared; using corn, straw and other starchy raw materials, a biobased nylon chip with a weight average molecular chain of 600KDa-700KDa, an average particle size of 6-9 microns, and a viscosity of 1.2-1.5 mps is prepared by biosynthesis; the regenerated nylon chip and the biobased nylon chip are mixed in a predetermined ratio, and a finishing agent is added under heating and melting; a POY bobbin yarn semi-finished product is prepared by spinning; the POY bobbin yarn semi-finished product is drawn, wound and subjected to elastic appearance treatment, and finally a DTY two-component nylon yarn is obtained.

[0034] The regenerated nylon chip is prepared by recycling discarded fishing nets or plastic mineral water bottles and adding a thickening agent for viscosity treatment to obtain a nylon monomer 6 chip. Specifically, the thickening agent is an acrylic ester type thickening agent TH5000 from Shanghai Dajin. Discarded fishing nets and plastic mineral water bottles are common plastic waste. By recycling these materials and converting them into nylon monomer 6 chips, not only is the pollution of plastic garbage to the environment reduced, but also resource recycling is achieved. Although the regenerated nylon chip is derived from waste, by adding a thickening agent for viscosity treatment, its viscosity and molecular chain length can be adjusted to make it more compatible with the biobased nylon chip in terms of physical and chemical properties. This two-component design can significantly enhance the elasticity of the nylon yarn and improve the overall performance of the product.

[0035] The preparation of the regenerated nylon chip includes the following steps:

[0036] S1, pretreatment: recycle and clean discarded fishing nets or plastic mineral water bottles, crush to a particle size of 18-20 mm of regenerated nylon chip bottle pieces; further clean, dry and color separation treatment;

[0037] S2, pulping: put the regenerated nylon chip bottle pieces into an esterification kettle, add an acrylic ester type thickening agent under normal pressure nitrogen protection, stir and react at a temperature of 100-270°C for 1-4 hours to obtain a regenerated nylon transparent liquid. Specifically, the thickening agent is an acrylic ester type thickening agent TH5000 from Shanghai Dajin.

[0038] S3, slicing: send the regenerated nylon transparent liquid into a reaction double screw rod, perform underwater granulation at a reaction temperature of 130-180°C, and then dry and package to obtain the regenerated nylon chip.

[0039] In this embodiment, the entire preparation process realizes the conversion from waste to high-quality regenerated nylon chips, not only reducing production costs, but also promoting resource recycling and sustainable development of the environment. The regenerated nylon chips prepared have stable physical and chemical properties, and can be well mixed and spun with bio-based nylon chips to obtain excellent performance of the two-component elastic nylon yarn.

[0040] The preparation of bio-based nylon chips uses bio-based pentanediamine and petroleum-based adipic acid as raw materials. Bio-based pentanediamine is prepared by microbial fermentation, and petroleum-based adipic acid is subjected to polycondensation reaction under stirring and catalysis to obtain bio-based nylon monomer 6 chips. By using bio-based pentanediamine to replace part or all of petroleum-based raw materials, the dependence on petroleum resources is reduced, and the negative impact on the environment is reduced.

[0041] The preparation of bio-based nylon chips includes the following steps:

[0042] S1, starch dissolution: corn, straw and other starchy raw materials are crushed and mixed with water to form a starch solution.

[0043] S2, saccharification and fermentation: 2g / L-10g / L of saccharification enzyme (Aspergillus oryzae) is added to the starch solution for fermentation to prepare a saccharification solution. This step can hydrolyze the α-1, 4 and α-1, 6 glycosidic bonds of polysaccharides (starch, glycogen, etc.) into glucose.

[0044] S3, aerobic fermentation: the saccharification solution is subjected to aerobic fermentation under constant temperature conditions to obtain a glycerol fermentation liquor. The fermentation temperature of aerobic fermentation is 42°C-45°C, and the fermentation time is 48 hours-72 hours, during which the stirring is 5 minutes every 4 hours.

[0045] S4, anaerobic fermentation: after the glycerol fermentation liquor is filtered, it is transferred into an anaerobic fermentation tank, 5g / L-10g / L of corynebacterium glutamicum is added, and anaerobic fermentation is carried out under constant temperature conditions. The fermentation temperature is 42°C-45°C, and the fermentation time is 72 hours-108 hours to obtain a pentanediamine liquid.

[0046] S5, polymerization reaction: the pentanediamine liquid and adipic acid are mixed in a molar ratio of 2:1.2-2:1.5, and an acrylic acid ester type thickening agent is added. Stirring is carried out at a temperature of 150°C-270°C for 2 hours-4 hours, while condensing and discharging the generated water to obtain a bio-based nylon liquid.

[0047] S6, slicing: the bio-based nylon liquid is sent into a reaction double-screw rod for underwater granulation at a reaction temperature of 160°C-200°C, followed by drying and packaging to obtain bio-based nylon chips.

[0048] In this embodiment, the preparation method of bio-based nylon chip uses renewable natural resources, microbial fermentation method, and the addition of acrylate type thickening agent to prepare bio-based nylon chip with high viscosity. Renewable natural resources such as corn and straw are used as raw materials, reducing the dependence on fossil fuels. Microbial fermentation method as a biological transformation technology has lower energy consumption and less waste generation compared to traditional chemical synthesis method, further improving environmental benefits. Adding acrylate type thickening agent during the polymerization reaction process can adjust the viscosity of bio-based nylon liquid to achieve high viscosity state, showing better flowability and fiber-forming property in subsequent processing, which is beneficial to form uniform and stable fiber structure.

[0049] The prepared regenerated nylon chip and bio-based nylon chip are heated and melted by extrusion, and then finishing agent is added; the weight ratio of the mixed regenerated nylon chip and bio-based nylon chip is 60:40; the heating and melting uses a double screw extruder, the heating and melting temperature of the regenerated nylon chip is 230-270°C, and the heating and melting temperature of the bio-based nylon chip is 200-250°C; the components of the regenerated nylon chip, bio-based nylon chip and finishing agent are as follows: regenerated nylon chip 40-60%, bio-based nylon chip 40-60%, antistatic agent 0.5-2%, antioxidant 0.1-0.5%, lubricant 0.1-1% and thickening agent 2-4% by mass percentage.

[0050] In this embodiment, by controlling the proportion of regenerated nylon chip and bio-based nylon chip, the balance of the performance of the two-component material is ensured. At the same time, by adding finishing agents such as antistatic agent, antioxidant, lubricant and thickening agent, the antistatic performance, oxidation resistance, processing performance and yarn elasticity of the yarn are further improved.

[0051] In this embodiment, by setting the ratio of regenerated nylon chip and bio-based nylon chip after mixing, it is helpful to form more uniform and stable spiral structure in the spinning process, thereby giving the yarn better elasticity.

[0052] In this embodiment, the preparation method uses discarded fishing nets and plastic mineral water bottles as raw materials for regenerated nylon chip, promoting the recycling of plastic waste and reducing environmental pollution. Bio-based nylon chip is synthesized using corn, straw and other starchy raw materials, reducing the dependence on petroleum resources. By mixing low-viscosity regenerated nylon chip and high-viscosity bio-based nylon chip, the difference in viscosity and molecular chain length between them is utilized to optimize the performance of nylon yarn. This two-component design makes the final product DTY two-component nylon yarn perform well in elasticity, meeting the market demand for high-performance nylon yarn.

[0053] A two-component elastic nylon yarn is prepared by the method described above. The two-component elastic nylon yarn is prepared by using bio-based raw materials and recycled raw materials, combined with the addition of thickening agent, which realizes the optimization of product performance and the improvement of environmental value. The final product has good physical properties and environmental characteristics. By adding a thickening agent to the bio-based nylon chip and the recycled nylon chip, the elasticity of the final product is effectively enhanced, and the two-component nylon yarn has high elastic recovery performance. The two-component elastic nylon yarn has excellent shaping effect, can maintain fiber softness while providing good support and shape retention ability. The product also has dry, crisp and other characteristics, making the textile products more comfortable, breathable and having good wearing experience during wearing.

[0054] Example one

[0055] 75D / 72 recycled nylon and bio-based two-component elastic nylon yarn production method, comprising the following steps:

[0056] I. Preparation of recycled nylon chip:

[0057] (1) Pretreatment: The recycled plastic mineral water bottles are crushed into 18mm recycled nylon chip bottle pieces after primary screening and cleaning. These bottle pieces are then deeply cleaned by a washing line, followed by drying treatment, and finally separated by infrared color separation equipment.

[0058] (2) Pulping: The crushed recycled nylon chip bottle pieces are pressed into an esterification kettle, and an acrylic ester type thickening agent TH5000 is added under normal pressure nitrogen protection. The mixture is stirred at 200℃ for 2 hours, and the generated water is condensed and discharged, obtaining a clear and transparent recycled nylon liquid with a viscosity of 0.7 mps.

[0059] (3) Chip: The liquid is sent into a reaction double-screw rod device and reacted at 150℃. After underwater granulation, drying and packaging, recycled nylon chips with a weight average molecular chain of 400KDa, an average particle size of 7 microns and a viscosity of 0.6 mps are obtained.

[0060] II. Preparation of bio-based nylon chip:

[0061] (1) Raw material preparation: The starchy raw materials such as corn and straw are fully crushed and mixed with water to form a starch solution.

[0062] (2) Saccharification and fermentation: Add saccharifying enzyme (Aspergillus oryzae) 5g / L to the starch solution and ferment at a suitable temperature to obtain a saccharified solution.

[0063] (3) Aerobic fermentation: under constant temperature control (42-45°C), the sugar solution is aerobically fermented for 48 hours, with stirring for 5 minutes every 4 hours, to obtain a glycerol fermentation liquor.

[0064] (4) Anaerobic fermentation: after the glycerol fermentation liquor is filtered, it is transferred to another fermentation tank, 5 g / L of corynebacterium glutamicum is added, and anaerobic fermentation is carried out at 42°C for 72 hours to obtain a pentanediamine liquor.

[0065] (5) Esterification reaction: pentanediamine and adipic acid are mixed in a ratio of 2:1.2, acrylic ester type thickening agent TH5000 is added, and stirring reaction is carried out at 170°C for 3 hours, and the produced water is condensed and discharged, to obtain a biobased nylon clear transparent liquid with a viscosity of 1.2 mps.

[0066] (6) Slicing: the liquid is sent into a reaction double-screw rod device, and reacted at 200°C, and after underwater granulation, drying and packaging, a biobased nylon chip with a weight average molecular chain of 700 KDa, an average particle size of 7 microns and a viscosity of 1.2 mps is obtained.

[0067] III. Preparation of biobased nylon yarn

[0068] The prepared regenerated nylon chip and biobased nylon chip are respectively sent into a screw extruder for extrusion and melting, the heating and melting temperature of the biobased nylon chip is 250°C, and the heating and melting temperature of the regenerated nylon chip is 250°C. The weight ratio of the mixed regenerated nylon chip and biobased nylon chip is 60:40. POY bobbin filament semi-finished products are prepared by spinning; the POY bobbin filament semi-finished products are drawn, wound and subjected to elastic appearance treatment, and finally DTY bi-component nylon yarn is obtained.

[0069] The 75D / 36F bi-component nylon yarn prepared in the above example and the same specification product (comparative sample) of regenerated nylon chip / biobased nylon chip filament on the market are tested for physical property indexes according to the FZ / T 54041-2011 standard. In the test, the elastic elongation of the two materials under the tension of 10N and 20N weights is measured, and the recovery length of the yarn after 30 minutes of retention under the condition of constant elongation (i.e. elongation of 200% and 300%) is observed. The test results are shown in Table 1.

[0070] Table 1 Performance test results of Example 1 and comparative sample

[0071]

[0072] The test data in Table 1 shows that the product of the present embodiment exhibits significant advantages in performance compared with existing recycled nylon chip / bio-based nylon chip filaments. Whether in terms of elastic elongation or elastic recovery rate, the product of the present embodiment is superior to the comparative sample, making it have excellent shaping effect. In addition, in terms of environmental protection indicators, the product of the present embodiment not only embodies the concept of plastic recycling, but also its synthetic raw materials mainly come from renewable resources such as corn and straw in nature, having the characteristics of environmental protection and plastic reduction.

[0073] The above description and examples of the specification are used to explain the scope of protection of the present application, but do not constitute a limitation on the scope of protection of the present application. Through the inspiration of the present application or the above examples, the modification, equivalent replacement or other improvement of the embodiments of the present application or one part of the technical features obtained by the ordinary skilled person in the art combined with common knowledge, ordinary technical knowledge and / or existing technology through logical analysis, reasoning or limited experiments shall be included in the scope of protection of the present application.

Claims

1. A process for the production of a two-component elastic nylon yarn, characterized by, The method comprises the following steps: The waste fishing nets or plastic mineral water bottles are used as raw materials, and after pretreatment and processing, the regenerated nylon chips with a weight average molecular chain of 300KDa-500KDa, an average particle size of 7-9 microns and a viscosity of 0.6-0.9 mps are prepared; the corn and straw starch raw materials are used to prepare the bio-based nylon chips with a weight average molecular chain of 600KDa-700KDa, an average particle size of 6-9 microns and a viscosity of 1.2-1.5 mps through a biosynthesis method; the prepared regenerated nylon chips and bio-based nylon chips are mixed according to a predetermined proportion, and a finishing agent is added in a heated and molten state; The POY can is spun into a POY can yarn semi-finished product; The POY can yarn semi-finished product is drawn, wound and elastically presented to finally obtain a DTY bicomponent nylon yarn.

2. The method for preparing a bicomponent elastic nylon yarn as described in claim 1, characterized in that, The regenerated nylon chips are prepared by recycling waste fishing nets or plastic mineral water bottles and adding a thickening agent for viscosity increasing treatment to obtain nylon single 6 chips.

3. The method for preparing a bicomponent elastic nylon yarn as described in claim 2, characterized in that, The preparation of the regenerated nylon chips comprises the following steps: S1, pretreatment: recycling and cleaning the waste fishing nets or plastic mineral water bottles, crushing to a particle size of 18-20 mm of the regenerated nylon chip bottle pieces, further cleaning, drying and color separation treatment; S2, pulping: the regenerated nylon chip bottle pieces are put into an esterification kettle, an acrylic ester type thickening agent is added under normal pressure nitrogen protection, stirring and reaction are carried out at a temperature of 100-270 DEG C for 1-4 hours to obtain regenerated nylon transparent liquid; S3, slicing: the regenerated nylon transparent liquid is sent into a reaction double screw rod for underwater granulation at a reaction temperature of 130-180 DEG C, and then dried and packaged to obtain regenerated nylon chips.

4. The method for preparing a bicomponent elastic nylon yarn as described in claim 1, characterized in that, The bio-based nylon chips are prepared by using bio-based pentanediamine and petroleum-based adipic acid as raw materials, bio-based pentanediamine is prepared by microbial fermentation method, and under stirring and catalysis conditions, the bio-based pentanediamine is subjected to polycondensation reaction with petroleum-based adipic acid to obtain bio-based nylon single 6 chips.

5. The method for preparing a bicomponent elastic nylon yarn as described in claim 4, characterized in that, The preparation of the bio-based nylon chips comprises the following steps: S1, starch dissolution: corn and straw starch raw materials are crushed and mixed with stirring water to form a starch solution; S2, saccharification and fermentation: 2-10 g / L of saccharifying enzyme is added to the starch solution for fermentation to prepare a saccharified solution; S3, aerobic fermentation: the saccharified solution is subjected to aerobic fermentation under constant temperature conditions to obtain a glycerol fermentation liquor; wherein the fermentation temperature is 42-45 DEG C, the fermentation time is 48-72 hours, and stirring is carried out every 4 hours for 5 minutes; S4, anaerobic fermentation: the glycerol fermentation liquor is filtered and transferred into an anaerobic fermentation tank, 5-10 g / L of corynebacterium glutamicum is added, and anaerobic fermentation is carried out under constant temperature conditions, the fermentation temperature is 42-45 DEG C, the fermentation time is 72-108 hours, and a pentanediamine liquid is obtained. S4, polymerization reaction: mixing pentanediamine liquid with adipic acid according to the molar ratio of 2:1.2~2:1.5, and adding acrylic acid ester type thickening agent, stirring and reacting at the temperature of 150~270℃ for 2~4 hours, while condensing and discharging the produced moisture, to obtain bio-based nylon liquid; S5, slicing: sending the bio-based nylon liquid into the reaction double screw rod to perform underwater granulation at the reaction temperature of 160~200℃, and then drying and packaging to obtain bio-based nylon slice.

6. The method for preparing a bicomponent elastic nylon yarn as described in claim 1, characterized in that, The components of the regenerated nylon slice, bio-based nylon slice and finishing agent are in the mass percentage ratio of: 40%~60% of regenerated nylon slice, 40%~60% of bio-based nylon slice, 0.5%~2% of antistatic agent, 0.1%~0.5% of antioxidant, 0.1%~1% of lubricant and 2%~4% of thickening agent.

7. The method for preparing a bicomponent elastic nylon yarn as described in claim 6, characterized in that, The weight ratio of the mixed regenerated nylon slice and bio-based nylon slice is 60:

40.

8. The method for preparing a bicomponent elastic nylon yarn as described in claim 1, characterized in that, The heating melting adopts a double screw extruder, wherein the heating melting temperature of the regenerated nylon slice is 230~270℃, and the heating melting temperature of the bio-based nylon slice is 200~250℃.

9. A two-component elastic nylon yarn characterized by, It is prepared by using the preparation method of the two-component elastic nylon yarn according to any one of claims 1 to 8. S4, polymerization reaction: mixing pentanediamine liquid with adipic acid according to the molar ratio of 2:1.2~2:1.5, and adding acrylic acid ester type thickening agent, stirring and reacting at the temperature of 150~270℃ for 2~4 hours, while condensing and discharging the produced moisture, to obtain bio-based nylon liquid; S5, slicing: sending the bio-based nylon liquid into the reaction double screw rod to perform underwater granulation at the reaction temperature of 160~200℃, and then drying and packaging to obtain bio-based nylon slice. The components of the regenerated nylon slice, bio-based nylon slice and finishing agent are in the mass percentage ratio of: 40%~60% of regenerated nylon slice, 40%~60% of bio-based nylon slice, 0.5%~2% of antistatic agent, 0.1%~0.5% of antioxidant, 0.1%~1% of lubricant and 2%~4% of thickening agent. The weight ratio of the mixed regenerated nylon slice and bio-based nylon slice is 60:

40. The heating melting adopts a double screw extruder, wherein the heating melting temperature of the regenerated nylon slice is 230~270℃, and the heating melting temperature of the bio-based nylon slice is 200~250℃. It is prepared by using the preparation method of the two-component elastic nylon yarn according to any one of claims 1 to 8.

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