Polyamide 56 monofilament with high strength, high haze and high transparency as well as preparation method and application of polyamide 56 monofilament

Abstract

The invention discloses a polyamide 56 monofilament with high strength, high haze and high transparency as well as a preparation method and application thereof, and belongs to the field of high polymer material processing. The polyamide 56 monofilament is prepared by taking polyamide 56, a high-molecular-weight polymer carrier and inorganic nanoparticles as raw materials through secondary granulation and melt spinning. The polyamide 56 monofilament has high strength, high haze and high transparency, the strength is larger than or equal to 3.0 cN / dtex, the light transmittance is larger than or equal to 80%, the haze is larger than or equal to 70%, and the polyamide 56 monofilament has wide application prospects.

Description

Technical Field

[0001] The present invention relates to a polyamide 56 monofilament that meets the requirements of high strength, high haze and high transparency, a preparation method and an application thereof, and belongs to the field of polymer material processing. Background Art

[0002] Polyamide 56 is a partially renewable thermoplastic polymer that can replace petroleum-based polymers as fiber raw materials, addressing resource shortages, environmental pollution, and carbon emissions associated with the development of synthetic fibers. High-strength, large-diameter monofilaments are specialized fibers primarily used in industrial applications. Currently, there are no reports on high-strength, large-diameter polyamide 56 monofilaments or their functionalized products.

[0003] Monofilaments that simultaneously meet the requirements of high strength, high haze, and high transparency can be used in areas such as automotive interiors. High transparency can increase the connection between the interior and the exterior, and high haze can reduce the glare and dizziness caused by strong external light. With the rapid development of new energy vehicles, the development of monofilaments that simultaneously meet the requirements of high strength, high haze, and high transparency using polyamide 56 has broad market prospects. However, the development of this product has the following difficulties: (1) Polyamide 56 is a semi-crystalline polymer. High strength requires polyamide 56 to have high crystallinity, but high crystallinity makes it difficult to achieve high transparency; (2) Nanoparticles have a large specific surface area and are easy to agglomerate. It is particularly difficult to disperse them in high molecular weight spinning-grade thermoplastic polymers. The agglomeration of inorganic nanoparticles will lead to a decrease in the spinnability and mechanical properties of polyamide 56, and it is difficult to achieve transparency.

[0004] At present, a lot of research has been carried out at home and abroad. Three methods, namely surface chemical modification, in situ polymerization and low molecular weight polymer dispersant, have been industrially used for the dispersion of nanoparticles in melt spinning.

[0005] Surface chemical modification methods achieve dispersion of nanoparticles in polymers by grafting small molecules or oligomers onto the surface of inorganic nanoparticles, inhibiting aggregation and enhancing the interaction between the nanoparticles and the polymer. However, this method requires the use of organic solvents and purification, making the process complex. If purification is inadequate, residual modifiers can lead to a decrease in the mechanical properties of the fiber.

[0006] In situ polymerization is an effective dispersion method in the spinning industry, which introduces nanoparticles during the polymer synthesis process to achieve dispersion. However, its application scenarios are limited and it is not suitable for systems that hybridize slices and nanoparticles.

[0007] The low-molecular-weight polymer dispersant method introduces a low-molecular-weight dispersant into the polymer matrix / nanoparticle blend. Leveraging its low melting point and excellent fluidity, it wets and coats the nanoparticles, breaking up agglomerates and achieving uniform dispersion. This method is widely used in the chemical fiber industry, but the introduction of low-molecular-weight dispersants can reduce the material's spinnability and mechanical properties. Summary of the Invention

[0008] [Technical Issues]

[0009] Polyamide 56 is a semi-crystalline polymer. High strength requires polyamide 56 to have high crystallinity, but high crystallinity makes it difficult to achieve high transparency.

[0010] Nanoparticles have a large specific surface area and are easy to agglomerate, making them particularly difficult to disperse in high molecular weight spinning-grade thermoplastic polymers. The agglomeration of inorganic nanoparticles will lead to a decrease in the spinnability and mechanical properties of polyamide 56 and make it difficult to achieve transparency.

[0011] The surface chemical modification method requires the use of organic solvents and needs to be purified; the in-situ polymer is not universally applicable; and the low molecular weight polymer dispersant method will cause a decrease in the spinnability and mechanical properties of the material.

[0012] [Technical solution]

[0013] To address these issues, the present invention utilizes polyamide 56, a high-molecular-weight polymer carrier, and inorganic nanoparticles as raw materials, through secondary granulation and melt spinning to produce polyamide 56 monofilament. The polyamide 56 monofilament of the present invention simultaneously meets the requirements of high strength, high haze, and high transparency, with a strength of ≥3.0 cN / dtex, a transmittance of ≥80%, and a haze of ≥70%, promising broad application prospects.

[0014] The first object of the present invention is to provide a polyamide 56 (PA56) monofilament that simultaneously meets the requirements of high strength, high haze, and high transparency, which is composed of polyamide 56 (PA56), a high molecular weight polymer carrier, and inorganic nanoparticles;

[0015] The high molecular weight polymer dispersion carrier is one of polypropylene, polyethylene, polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate.

[0016] Furthermore, the particle size of the inorganic nanoparticles is 1 to 350 nm, and the size of the inorganic nanoparticle aggregates does not exceed 700 nm.

[0017] Furthermore, the high molecular weight polymer dispersion carrier exists in the monofilament in the form of microfibers, and the diameter thereof does not exceed 700 nm.

[0018] Furthermore, the polyamide 56 monofilament that meets the requirements of high strength, high haze and high transparency has a strength of ≥3.0 cN / dtex, a light transmittance of ≥80%, and a haze of ≥70%.

[0019] A second object of the present invention is to provide a method for preparing the polyamide 56 monofilament having high strength, high haze, and high transparency as described in the present invention, comprising the following steps:

[0020] (1) Primary granulation:

[0021] melt-blending and granulating the high molecular weight polymer and inorganic nanoparticles to obtain high molecular weight polymer / inorganic nanoparticle blend chips;

[0022] (2) Secondary granulation:

[0023] The high molecular weight polymer / inorganic nanoparticle blend chips are melt-blended and granulated with polyamide 56 (PA56) to obtain polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips;

[0024] (3) Preparation of polyamide 56 monofilament:

[0025] Polyamide 56 monofilament is obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through the process of melt extrusion - water bath cooling - hot steam stretching - hot air stretching - heat setting.

[0026] Further preferably, in step (1), the premixing is performed for 3 to 15 minutes before melt blending and granulation, the granulation temperature is 160 to 290° C., and the rotation speed is 50 to 500 rpm; the high molecular weight polymer / inorganic nanoparticle blend slices are vacuum dried at a temperature of 90 to 150° C. for 8 to 48 hours.

[0027] Further preferably, in step (2), the premixing is performed for 3 to 15 minutes before the melt blending and granulation, the granulation temperature is 265 to 290°C, and the rotation speed is 50 to 500 rpm; the vacuum drying temperature of the polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend slices is 90 to 150°C and the time is 8 to 48 hours.

[0028] Further preferably, the melt spinning in step (3) is melt horizontal spinning, the spinning temperature is 265-310°C; the winding speed of one roller is 1-50 m / min, and the water bath temperature is 10-75°C; the temperature of hot steam drawing is 60-95°C, and the drawing ratio is 2-8; the temperature of the second hot air drawing is 120-195°C, and the drawing ratio is 1.0-1.5; and the heat setting temperature is 120-230°C.

[0029] The third object of the present invention is to provide a polyamide 56 yarn that simultaneously meets the requirements of high strength, high haze and high transparency, which uses the polyamide 56 monofilament that simultaneously meets the requirements of high strength, high haze and high transparency described in the present invention.

[0030] The fourth object of the present invention is to provide a polyamide 56 fabric that simultaneously meets the requirements of high strength, high haze, and high transparency, which uses the polyamide 56 monofilament that simultaneously meets the requirements of high strength, high haze, and high transparency described in the present invention.

[0031] A fifth object of the present invention is to provide an automobile interior, which uses the polyamide 56 monofilament of the present invention that meets the requirements of high strength, high haze and high transparency.

[0032] The sixth object of the present invention is to apply the polyamide 56 monofilament that meets the requirements of high strength, high haze and high transparency, the polyamide 56 yarn that meets the requirements of high strength, high haze and high transparency, and the polyamide 56 fabric that meets the requirements of high strength, high haze and high transparency as described in the present invention in the field of functional materials.

[0033] In one embodiment of the present invention, the field of functional materials includes clothing, hygiene, packaging and other fields.

[0034] In one embodiment of the present invention, the functional material includes automotive interior trim and the like.

[0035] A seventh object of the present invention is to provide a method for simultaneously improving the strength, haze, and transparency of polyamide 56 monofilament, comprising the following steps:

[0036] (1) Primary granulation:

[0037] melt-blending and granulating the high molecular weight polymer and inorganic nanoparticles to obtain high molecular weight polymer / inorganic nanoparticle blend chips;

[0038] (2) Secondary granulation:

[0039] melt-blending and granulating the high molecular weight polymer / inorganic nanoparticle blended chips with polyamide 56 to obtain polyamide 56 / high molecular weight polymer / inorganic nanoparticle blended chips;

[0040] (3) Preparation of polyamide 56 monofilament:

[0041] Polyamide 56 monofilament is obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through the process of melt extrusion - water bath cooling - hot steam stretching - hot air stretching - heat setting.

[0042] [Beneficial Effects]

[0043] (1) The polyamide 56 monofilament prepared by the present invention, which meets the requirements of high strength, high haze and high transparency, is mainly composed of thermoplastic polyamide 56, which is partially renewable in resources, and is prepared by melt spinning, and has the characteristics of being green and low-carbon.

[0044] (2) The present invention proposes a new method for constructing a double-dispersed structure to achieve efficient dispersion of inorganic nanoparticles in polyamide 56. The present invention uses a high molecular weight polymer as a dispersion carrier, disperses the inorganic nanoparticles in the dispersion carrier, and the high molecular weight polymer dispersion carrier is dispersed in the polyamide 56 matrix polymer, constructing a double-dispersed structure so that the size of the dispersed phase of the high molecular weight polymer dispersion carrier is significantly smaller than the diameter of the spinneret, ensuring smooth spinning. Moreover, since the dispersion carrier is a high molecular weight polymer, it will not cause a decrease in the mechanical properties of the final fiber.

[0045] (3) The present invention achieves the unity of high strength, high haze and high transparency of the monofilament by constructing a double-dispersed structure and regulating the external field of the spinning process. The present invention adopts a special forming process for high-strength, large-diameter monofilaments. After melt extrusion, the polyamide 56 / high molecular weight polymer / inorganic nanoparticle blended slices are rapidly cooled in a water bath to inhibit the rapid crystallization of polyamide 56, so that the polyamide 56 monofilament is in an amorphous state for subsequent high-magnification drawing; then, at a temperature slightly higher than the glass transition temperature of polyamide 56, high-magnification drawing is performed by hot steam to improve the orientation of polyamide 56 and form fine crystal nuclei to avoid the formation of large-sized crystals; then, hot air drawing is performed to further improve the orientation and crystallinity of the polyamide 56 monofilament; finally, heat setting is performed to increase the thickness, crystallinity and dimensional stability of the crystals to obtain high-strength and transparent polyamide 56 monofilaments.

[0046] At the same time, the polyamide 56 monofilament contains a dispersed phase formed by a high molecular weight polymer dispersion carrier and inorganic nanoparticles. The high molecular weight polymer dispersion carrier is microfibrillated during the high-multiple stretching process. In addition, due to the interaction between the inorganic nanoparticles and the polymer dispersion carrier, the inorganic nanoparticles will be further dispersed during the microfibrillation of the high molecular weight polymer dispersion carrier, so that the size of the high molecular weight polymer dispersion carrier microfibers, inorganic nanoparticles and their aggregates does not exceed the wavelength of visible light, so that the functional polyamide 56 monofilament has high transparency.

[0047] In addition, due to the scattering effect of high molecular weight polymer dispersion carrier and inorganic nanoparticles, the functional polyamide 56 monofilament has high haze.

[0048] (4) The polyamide 56 monofilament prepared by the present invention satisfies the requirements of high strength, high haze and high transparency at the same time. Not only does it have high strength, high haze and high transparency, but also, due to its high haze and high transparency, it can further increase the function of the monofilament; the polyamide 56 monofilament of the present invention has a strength of ≥3.0 cN / dtex, a transmittance of ≥80%, and a haze of ≥70%. DETAILED DESCRIPTION

[0049] The following describes preferred embodiments of the present invention. It should be understood that the embodiments are for better explanation of the present invention and are not intended to limit the present invention.

[0050] Test method:

[0051] 1. Diameter test method:

[0052] The diameter of the monofilaments was measured using a scanning electron microscope.

[0053] 2. Tensile mechanical properties test method:

[0054] The tensile mechanical properties of the fiber were tested in accordance with the national standard "GB / T 14344-2022 Test method for tensile properties of chemical fiber filaments".

[0055] 3. Transmittance and haze test methods:

[0056] The monofilaments were tightly arranged in parallel to form a single monofilament layer of 5 cm × 5 cm. The transmittance and haze of light of a specific wavelength were measured in accordance with the national standard "GB / T 2410-2008 Transparent Plastics Light Transmittance and Haze".

[0057] Example 1

[0058] A polyamide 56 (PA56) monofilament that simultaneously meets the requirements of high strength, high haze, and high transparency, comprising polyethylene terephthalate (PET), zinc oxide (ZnO) nanoparticles with a particle size of 20 nm, and PA56;

[0059] The preparation method is as follows:

[0060] (1) Primary granulation:

[0061] Polyethylene terephthalate (PET) and zinc oxide (ZnO) nanoparticles with a particle size of 20 nm were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 280°C and a screw speed of 400 rpm to obtain PET / ZnO blend chips. The obtained PET / ZnO blend chips were vacuum-dried at 150°C for 24 hours and set aside.

[0062] (2) Secondary granulation:

[0063] The PA56 and PET / ZnO blend chips were pre-mixed in a high-speed mixer for 6 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 280°C and a screw speed of 450 rpm to obtain PA56 / PET / ZnO blend chips. The obtained PA56 / PET / ZnO blend chips were vacuum-dried at 150°C for 24 hours and set aside.

[0064] (3) Preparation of high-strength, high-fog, transparent functional polyamide 56 monofilament:

[0065] PA56 / PET / ZnO blend chips are used as raw materials, and PA56 / PET / ZnO monofilaments are produced through melt horizontal spinning, melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0066] Among them, the mass ratio of PA56, PET, and ZnO is 90:10:1;

[0067] The spinning temperature is 295°C, the first roller winding speed is 20m / min, the water bath temperature is 15°C, the hot steam drawing temperature is 85°C, the drawing ratio is 5, the second hot air drawing temperature is 185°C, the drawing ratio is 1.2, and the heat setting temperature is 200°C.

[0068] Comparative Example 1

[0069] Omit step (1) of Example 1;

[0070] Directly melt-blending ZnO and PA56 to form granules to produce PA56 / ZnO chips;

[0071] PA56 / ZnO chips are used as raw materials and PA56 / ZnO monofilaments are produced through melt horizontal spinning, melt extrusion, water bath cooling, hot steam stretching, hot air stretching and heat setting.

[0072] The mass ratio of PA56 to ZnO is 100:1, and the spinning process parameters are the same as those in Example 1.

[0073] Comparative Example 2

[0074] The second hot air drawing ratio in step (3) of Example 1 was changed to 1.6 times, and the other conditions were kept the same as in Example 1 to obtain PA56 / PET / ZnO monofilament.

[0075] Comparative Example 3

[0076] The PET in step (1) of Example 1 was adjusted to PA56, and the other parts were kept consistent with Example 1 to prepare a monofilament.

[0077] Comparative Example 4

[0078] The mass ratio of PA56, PET and ZnO in Example 1 was adjusted to 98:2:1; other parameters were kept the same as in Example 1 to prepare a monofilament.

[0079] The PA56 monofilaments obtained in Example 1 and Comparative Examples 1 to 7 were subjected to performance tests. The test results are as follows:

[0080] Table 1 Test results

[0081]

[0082] From Table 1 we can see that:

[0083] Without introducing PET as a dispersion carrier, PA56 and ZnO were directly melt-blended to prepare PA56 / ZnO chips. The PA56 / ZnO chips were used as raw materials to spin monofilaments. The spinning continuity was poor, and the strength, light transmittance and haze of the monofilaments were low. This was due to the uneven dispersion of ZnO in PA56.

[0084] When the second hot air drafting ratio is too high, 1.6 times, although the PA56 / PET / ZnO monofilament has good spinnability, its tensile strength decreases, and its transparency and haze are low.

[0085] When the mixture with PET is changed to PA56, the dispersion of ZnO in the PA56 / ZnO obtained by the two blends decreases, the strength of the monofilament decreases, the spinnability decreases, and the transparency and haze also decrease.

[0086] When the PET content decreases, it is difficult to achieve 1% ZnO encapsulation with a 2% PET content, the dispersibility of ZnO decreases, the spinnability of the monofilament decreases, and the transparency and haze also decrease.

[0087] Example 2

[0088] A PA56 monofilament that meets the requirements of high strength, high haze, and high transparency, composed of polypropylene (PP), MgO nanoparticles with a particle size of 40nm, and PA56;

[0089] The preparation method is as follows:

[0090] (1) Primary granulation:

[0091] Polypropylene (PP) and MgO nanoparticles with a particle size of 40 nm were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 195°C and a screw speed of 400 rpm to obtain PP / MgO blend chips. The PP / MgO blend chips were vacuum-dried at 120°C for 24 hours and set aside.

[0092] (2) Secondary granulation:

[0093] The PA56 and PP / MgO blended chips were pre-mixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 275°C and a screw speed of 400 rpm to obtain PA56 / PP / MgO blended chips. The obtained PA56 / PP / MgO blended chips were vacuum-dried at 120°C for 24 hours and set aside.

[0094] (3) Preparation of high-strength, high-fog, transparent functional polyamide 56 monofilament:

[0095] PA56 / PP / MgO blend chips are used as raw materials, and PA56 / PP / MgO monofilaments are produced through melt horizontal spinning, melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0096] Among them, the mass ratio of PA56, PP, and MgO is 95:5:0.5;

[0097] The spinning temperature is 285°C, the first roller winding speed is 18m / min, and the water bath temperature is 15°C; the hot steam drawing temperature is 80°C, and the drawing ratio is 5.4; the second hot air drawing temperature is 150°C, and the drawing ratio is 1.2; the heat setting temperature is 150°C.

[0098] Example 3

[0099] A PA56 monofilament that meets the requirements of high strength, high haze, and high transparency, composed of polytrimethylene terephthalate (PTT), copper oxide (CuO), and PA56;

[0100] The preparation method is as follows:

[0101] (1) Primary granulation:

[0102] Poly(trimethylene terephthalate) (PTT) and copper oxide (CuO) were pre-mixed in a high-speed mixer for 8 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 240° C. and a screw speed of 420 rpm to obtain PTT / CuO blend chips. The obtained PTT / CuO blend chips were vacuum-dried at 120° C. for 24 hours and set aside.

[0103] (2) Secondary granulation:

[0104] The PA56 and PTT / CuO blended chips were pre-mixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 280°C and a screw speed of 450 rpm to obtain PA56 / PTT / CuO blended chips. The obtained PA56 / PTT / CuO blended chips were vacuum-dried at 120°C for 24 hours and set aside.

[0105] (3) Preparation of high-strength, high-fog, transparent functional polyamide 56 monofilament:

[0106] PA56 / PTT / CuO blend chips were used as raw materials and PA56 / PTT / CuO monofilaments were produced through melt horizontal spinning, melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0107] Among them, the mass ratio of PA56, PTT, and CuO is 90:10:0.8;

[0108] The spinning temperature is 285°C, the first roller winding speed is 20m / min, and the water bath temperature is 15°C; the hot steam drawing temperature is 85°C, and the drawing ratio is 5; the second hot air drawing temperature is 180°C, and the drawing ratio is 1.25; the heat setting temperature is 200°C.

[0109] Example 4

[0110] A PA56 monofilament that meets the requirements of high strength, high haze, and high transparency, composed of polyethylene (PE), aluminum oxide (Al2O3) powder with a particle size of 30nm, and PA56;

[0111] The preparation method is as follows:

[0112] (1) Primary granulation:

[0113] Polyethylene (PE) and aluminum oxide (Al2O3) powder with a particle size of 30 nm were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 190°C and a screw speed of 400 rpm to obtain PE / Al2O3 blend chips. The PE / Al2O3 blend chips were vacuum-dried at 100°C for 36 hours and set aside.

[0114] (2) Secondary granulation:

[0115] The PA56 and PE / Al2O3 blended chips were pre-mixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 280°C and a screw speed of 400 rpm to obtain PA56 / PE / Al2O3 blended chips. The obtained PA56 / PE / Al2O3 blended chips were vacuum-dried at 100°C for 36 hours and set aside.

[0116] (3) Preparation of high-strength, high-fog, transparent functional polyamide 56 monofilament:

[0117] PA56 / PE / Al2O3 blend chips are used as raw materials, and PA56 / PE / Al2O3 monofilaments are produced through melt horizontal spinning, melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0118] Among them, the mass ratio of PA56, PE, and Al2O3 is 95:5:0.5;

[0119] The spinning temperature is 290℃; the winding speed of one roller is 18m / min, the water bath temperature is 12℃; the temperature of hot steam drawing is 80℃, and the drawing ratio is 5; the temperature of the second hot air drawing is 120℃, and the drawing ratio is 1.2; the heat setting temperature is 120℃.

[0120] Example 5

[0121] A PA56 monofilament that meets the requirements of high strength, high haze, and high transparency, composed of polybutylene succinate (PBT), cuprous oxide (Cu2O), and PA56;

[0122] The preparation method is as follows:

[0123] (1) Primary granulation:

[0124] Polybutylene succinate (PBT) and cuprous oxide (Cu2O) were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 240°C and a screw speed of 450 rpm to obtain PBT / Cu2O blend chips. The obtained PBT / Cu2O blend chips were vacuum-dried at 100°C for 24 hours and set aside.

[0125] (2) Secondary granulation:

[0126] The PA56 and PBT / Cu2O blended chips were pre-mixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw blender at a granulation temperature of 280°C and a screw speed of 450 rpm to obtain PA56 / PBT / Cu2O blended chips. The obtained PA56 / PBT / Cu2O blended chips were vacuum-dried at 150°C for 24 hours and set aside.

[0127] (3) Preparation of high-strength, high-fog, transparent functional polyamide 56 monofilament:

[0128] PA56 / PBT / Cu2O blend chips were used as raw materials and PA56 / PBT / Cu2O monofilaments were produced through melt horizontal spinning, melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0129] Among them, the mass ratio of PA56, PBT, and Cu2O is 90:10:0.5;

[0130] The spinning temperature is 290°C; the winding speed of one roller is 20m / min, the water bath temperature is 20°C; the temperature of hot steam drawing is 85°C, and the drawing ratio is 5.4; the temperature of the second hot air drawing is 180°C, and the drawing ratio is 1.2; the heat setting temperature is 200°C.

[0131] The obtained PA56 monofilament was subjected to performance testing and the test results are as follows:

[0132] Table 2 Test results

[0133] example Diameter (mm) Strength (cN / dtex) Elongation at break (%) Light transmittance (%) Haze (%) Spinnability Example 2 0.201 4.6 23.2 82.2 80.5 Good spinnability Example 3 0.196 4.4 27.9 84.2 83.6 Good spinnability Example 4 0.198 3.9 26.3 81.7 82.5 Good spinnability Example 5 0.196 4.3 25.8 82.8 83.4 Good spinnability

[0134] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A polyamide 56 monofilament that meets the requirements of high strength, high haze, and high transparency, characterized in that: It is composed of polyamide 56, high molecular weight polymer carrier and inorganic nanoparticles; The high molecular weight polymer dispersion carrier is one of polypropylene, polyethylene, polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate.

2. The polyamide 56 monofilament having high strength, high haze and high transparency according to claim 1, characterized in that: The polyamide 56 monofilament meets the requirements of high strength, high haze and high transparency, with a strength of ≥3.0 cN / dtex, a light transmittance of ≥80% and a haze of ≥70%.

3. A method for preparing the polyamide 56 monofilament having high strength, high haze and high transparency as claimed in claim 1 or 2, characterized in that: The steps include: (1) Primary granulation: melt-blending and granulating the high molecular weight polymer and inorganic nanoparticles to obtain high molecular weight polymer / inorganic nanoparticle blend chips; (2) Secondary granulation: melt-blending and granulating the high molecular weight polymer / inorganic nanoparticle blended chips with polyamide 56 to obtain polyamide 56 / high molecular weight polymer / inorganic nanoparticle blended chips; (3) Preparation of polyamide 56 monofilament: Polyamide 56 monofilament is obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through the process of melt extrusion - water bath cooling - hot steam stretching - hot air stretching - heat setting.

4. The method according to claim 3, characterized in that In step (3), the melt spinning is horizontal melt spinning, the spinning temperature is 265-310°C; the winding speed of one roller is 1-50 m / min, the water bath temperature is 10-75°C; the temperature of the hot steam drawing is 60-95°C, and the drawing ratio is 2-8; the temperature of the second hot air drawing is 120-195°C, and the drawing ratio is 1.0-1.5; and the heat setting temperature is 120-230°C.

5. The method according to claim 3, characterized in that In step (1), the premixing is performed for 3 to 15 minutes before melt blending and granulation, the granulation temperature is 160 to 290° C., and the rotation speed is 50 to 500 rpm; and in step (2), the premixing is performed for 3 to 15 minutes before melt blending and granulation, the granulation temperature is 265 to 290° C., and the rotation speed is 50 to 500 rpm.

6. A polyamide 56 yarn that meets the requirements of high strength, high haze and high transparency, characterized in that: The polyamide 56 monofilament as claimed in claim 1 or 2 is used, which meets the requirements of high strength, high haze and high transparency.

7. A polyamide 56 fabric that meets the requirements of high strength, high haze and high transparency, characterized in that: The polyamide 56 monofilament as claimed in claim 1 or 2 is used, which meets the requirements of high strength, high haze and high transparency.

8. An automobile interior, characterized in that: The polyamide 56 monofilament as claimed in claim 1 or 2 is used, which meets the requirements of high strength, high haze and high transparency.

9. Application of the polyamide 56 monofilament that simultaneously meets the requirements of high strength, high haze, and high transparency as described in claim 1 or 2, the polyamide 56 yarn that simultaneously meets the requirements of high strength, high haze, and high transparency as described in claim 6, and the polyamide 56 fabric that simultaneously meets the requirements of high strength, high haze, and high transparency as described in claim 7 in the field of functional materials.

10. A method for simultaneously improving the strength, haze and transparency of polyamide 56 monofilament, characterized in that: The steps include: (1) Primary granulation: melt-blending and granulating the high molecular weight polymer and inorganic nanoparticles to obtain high molecular weight polymer / inorganic nanoparticle blend chips; (2) Secondary granulation: melt-blending and granulating the high molecular weight polymer / inorganic nanoparticle blended chips with polyamide 56 to obtain polyamide 56 / high molecular weight polymer / inorganic nanoparticle blended chips; (3) Preparation of polyamide 56 monofilament: Polyamide 56 monofilament is obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through the process of melt extrusion - water bath cooling - hot steam stretching - hot air stretching - heat setting.

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