Polyamide 56 monofilament satisfying high strength, high haze and high transparency simultaneously, and preparation method and application thereof

Abstract

The application discloses a kind of polyamide 56 monofilament satisfying high strength, high haze, high transparency simultaneously and preparation method and application, belong to high polymer material processing field.The polyamide 56 monofilament of the application is prepared by secondary granulation, melt spinning with polyamide 56, high molecular weight polymer carrier and inorganic nano-particle as raw material.The polyamide 56 monofilament of the application satisfies high strength, high haze, high transparency simultaneously, strength is greater than or equal to 3.0 cN / dtex, light transmittance is greater than or equal to 80%, haze is greater than or equal to 70%, with wide application prospect.

Description

Technical Field

[0001] This invention relates to a polyamide 56 monofilament that simultaneously satisfies high strength, high haze, and high transparency, as well as its preparation method and applications, belonging to the field of polymer material processing. Background Technology

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

[0003] Simultaneously satisfying high strength, high haze, and high transparency, monofilaments can be used in automotive interiors and other fields. High transparency can increase the connection between the interior and 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 satisfy high strength, high haze, and high transparency using polyamide 56 has broad market prospects. However, the development of this product faces 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 prone to agglomeration. They are particularly difficult to disperse in high molecular weight spinning-grade thermoplastic polymers. Agglomeration of inorganic nanoparticles can lead to a decrease in the spinnability and mechanical properties of polyamide 56 and make it difficult to achieve transparency.

[0004] Currently, a large amount of research has been conducted both domestically and internationally. Three methods—surface chemical modification, in-situ polymerization, and low molecular weight polymer dispersant method—have been industrially used for the dispersion of nanoparticles in melt spinning.

[0005] Surface chemical modification involves grafting small molecules or oligomers onto the surface of inorganic nanoparticles, inhibiting aggregation and enhancing the interaction between nanoparticles and polymers, thereby achieving nanoparticle dispersion within the polymer. However, this method requires the use of organic solvents and purification, making the process complex. Insufficient purification can lead to a decrease in fiber mechanical properties due to residual modifiers.

[0006] In-situ polymerization introduces nanoparticles into the polymer synthesis process to achieve dispersion. It is an effective dispersion method in the spinning industry, but its application is limited and it is not suitable for systems with chips and nanoparticle hybrids.

[0007] The low molecular weight polymer dispersant method involves introducing low molecular weight dispersants into polymer matrix / nanoparticle blends. Utilizing their low melting point and good flowability, these dispersants wet and coat the nanoparticles, breaking up agglomerates and achieving uniform dispersion. This method is widely used in the chemical fiber industry; however, the introduction of low molecular weight dispersants can reduce the spinnability and mechanical properties of the material. 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 prone to aggregation, making them particularly difficult to disperse in high molecular weight spinning-grade thermoplastic polymers. Aggregation of inorganic nanoparticles can lead to a decrease in the spinnability and mechanical properties of polyamide 56, as well as difficulty in achieving transparency.

[0011] Surface chemical modification requires the use of organic solvents, which need to be purified; in-situ polymers are not universally applicable; and low molecular weight polymer dispersant methods can lead to a decrease in the spinnability and mechanical properties of materials.

[0012] [Technical Solution]

[0013] To address the aforementioned problems, this invention uses polyamide 56, a high-molecular-weight polymer carrier, and inorganic nanoparticles as raw materials, and prepares polyamide 56 monofilaments through secondary granulation and melt spinning. The polyamide 56 monofilaments of this invention simultaneously meet the requirements of high strength, high haze, and high transparency, with a strength ≥3.0 cN / dtex, light transmittance ≥80%, and haze ≥70%, demonstrating broad application prospects.

[0014] The first objective of this invention is to provide a polyamide 56 (PA56) monofilament that simultaneously satisfies 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, propylene terephthalate, and polybutylene terephthalate.

[0016] Furthermore, the particle size of the inorganic nanoparticles is between 1 and 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 form of microfibers in the monofilament, with a diameter not exceeding 700 nm.

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

[0019] The second objective of this invention is to provide a method for preparing polyamide 56 monofilaments that simultaneously meet the requirements of high strength, high haze, and high transparency, comprising the following steps:

[0020] (1) Single granulation:

[0021] High molecular weight polymers and inorganic nanoparticles are melt-blended and granulated to obtain high molecular weight polymer / inorganic nanoparticle blended slices;

[0022] (2) Secondary granulation:

[0023] High molecular weight polymer / inorganic nanoparticle blend chips were 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 monofilaments were obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0026] More preferably, in step (1), the melt blending is premixed for 3 to 15 minutes before 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] More preferably, in step (2), the melt blending is premixed for 3 to 15 minutes before 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] More preferably, in step (3), the melt spinning is horizontal melt spinning, the spinning temperature is 265-310℃; the first roll winding speed is 1-50m / min, the water bath temperature is 10-75℃; the hot steam drawing temperature is 60-95℃, the drawing ratio is 2-8; the second hot air drawing temperature is 120-195℃, the drawing ratio is 1.0-1.5; and the heat setting temperature is 120-230℃.

[0029] The third objective of this invention is to provide a polyamide 56 yarn that simultaneously satisfies high strength, high haze, and high transparency, which employs the polyamide 56 monofilament described in this invention that simultaneously satisfies high strength, high haze, and high transparency.

[0030] The fourth objective of this invention is to provide a polyamide 56 fabric that simultaneously satisfies high strength, high haze, and high transparency, which employs the polyamide 56 monofilament described in this invention that simultaneously satisfies high strength, high haze, and high transparency.

[0031] The fifth objective of this invention is to provide an automotive interior that utilizes the polyamide 56 monofilament described in this invention, which simultaneously satisfies the requirements of high strength, high haze, and high transparency.

[0032] The sixth objective of this invention is the application of the polyamide 56 monofilament, polyamide 56 yarn, and polyamide 56 fabric that simultaneously meet the requirements of high strength, high haze, and high transparency, as described in this 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 materials include automotive interior materials, etc.

[0035] The seventh objective of this invention is to provide a method for simultaneously improving the strength, haze, and transparency of polyamide 56 monofilaments, comprising the following steps:

[0036] (1) Single granulation:

[0037] High molecular weight polymers and inorganic nanoparticles are melt-blended and granulated to obtain high molecular weight polymer / inorganic nanoparticle blended slices;

[0038] (2) Secondary granulation:

[0039] High molecular weight polymer / inorganic nanoparticle blend chips were melt-blended and granulated with polyamide 56 to obtain polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips.

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

[0041] Polyamide 56 monofilaments were obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through melt extrusion, water bath cooling, hot steam stretching, hot air stretching, and heat setting.

[0042] [Beneficial Effects]

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

[0044] (2) This invention proposes a novel method for constructing a bidispersive structure to achieve efficient dispersion of inorganic nanoparticles in polyamide 56. This invention uses a high molecular weight polymer as the dispersion carrier, dispersing the inorganic nanoparticles within the carrier and the high molecular weight polymer carrier within the polyamide 56 matrix polymer, thus constructing a bidispersive structure. This results in the size of the dispersed phase in the high molecular weight polymer carrier being significantly smaller than the diameter of the spinneret orifice, ensuring smooth spinning. Furthermore, because the dispersion carrier is a high molecular weight polymer, it does not cause a decrease in the final fiber's mechanical properties.

[0045] (3) This invention achieves a unified high strength, high haze, and high transparency of monofilaments by constructing a bidisperse structure and controlling the external field of spinning processing. This invention utilizes a special forming process for high-strength, large-diameter monofilaments. Polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips are melt-extruded and then rapidly cooled in a water bath to suppress rapid crystallization of polyamide 56, keeping the polyamide 56 monofilaments in an amorphous state for subsequent high-ratio drawing. Then, at a temperature slightly above the glass transition temperature of polyamide 56, high-ratio drawing with hot steam is performed to improve the orientation of polyamide 56 and form fine crystal nuclei, avoiding the formation of large crystals. Next, hot air drawing further improves the orientation and crystallinity of the polyamide 56 monofilaments. Finally, heat setting is performed to increase the thickness, crystallinity, and dimensional stability of the lamellar crystals, resulting in high-strength, transparent polyamide 56 monofilaments.

[0046] Meanwhile, the polyamide 56 monofilament contains a dispersed phase formed by a high molecular weight polymer dispersion carrier and inorganic nanoparticles. During the high-ratio stretching process, the high molecular weight polymer dispersion carrier undergoes microfibrillation. 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. This ensures that the size of the microfibrils of the high molecular weight polymer dispersion carrier, the inorganic nanoparticles, and their aggregates does not exceed the wavelength of visible light, resulting in the high transparency of the functional polyamide 56 monofilament.

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

[0048] (4) The polyamide 56 monofilament prepared by the present invention not only has high strength, high haze and high transparency, but also can further enhance the function of the monofilament due to its high haze and high transparency; the polyamide 56 monofilament of the present invention has a strength ≥3.0cN / dtex, a light transmittance ≥80% and a haze ≥70%. Detailed Implementation

[0049] The preferred embodiments of the present invention are described below. 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 testing method:

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

[0053] 2. Tensile mechanical property testing methods:

[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. Test methods for transmittance and haze:

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

[0057] Example 1

[0058] A polyamide 56 (PA56) monofilament that simultaneously satisfies high strength, high haze, and high transparency is composed of polyethylene terephthalate (PET), zinc oxide (ZnO) nanoparticles with a particle size of 20nm, and PA56.

[0059] Its preparation method is as follows:

[0060] (1) Single 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 min, and then melt-blended and granulated in a twin-screw mixer at a granulation temperature of 280 °C and a screw speed of 400 rpm to obtain PET / ZnO blended chips. The obtained PET / ZnO blended chips were vacuum dried at 150 °C for 24 h for later use.

[0062] (2) Secondary granulation:

[0063] PA56 and PET / ZnO blended chips were premixed in a high-speed mixer for 6 minutes, and then melt-blended and granulated in a twin-screw mixer at a granulation temperature of 280℃ and a screw speed of 450 rpm to obtain PA56 / PET / ZnO blended chips. The obtained PA56 / PET / ZnO blended chips were vacuum dried at 150℃ for 24 hours for later use.

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

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

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

[0067] The spinning temperature is 295℃, the first-roll winding speed is 20m / min, the water bath temperature is 15℃, the hot steam stretching temperature is 85℃ with a stretching ratio of 5, the second hot air stretching temperature is 185℃ with a stretching ratio of 1.2, and the heat setting temperature is 200℃.

[0068] Comparative Example 1

[0069] Step (1) of Example 1 is omitted;

[0070] PA56 / ZnO chips were prepared by directly melt-blending and granulating ZnO and PA56.

[0071] PA56 / ZnO chips were used as raw materials to produce PA56 / ZnO monofilaments 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; the spinning process parameters are consistent with those in Example 1.

[0073] Comparative Example 2

[0074] The second hot air stretching ratio in step (3) of Example 1 was changed to 1.6 times, while the rest remained 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 changed to PA56, while the rest remained the same as in Example 1, and a monofilament was prepared.

[0077] Comparative Example 4

[0078] The mass ratio of PA56, PET, and ZnO in Example 1 was adjusted to 98:2:1; all other parameters remained the same as in Example 1, and monofilaments were prepared.

[0079] The performance test results of the PA56 monofilaments obtained in Example 1 and Comparative Examples 1-7 are as follows:

[0080] Table 1 Test Results

[0081]

[0082] As can be seen from Table 1:

[0083] PA56 / ZnO chips were prepared by directly melt-blending PA56 and ZnO without introducing PET as a dispersion carrier. When PA56 / ZnO chips were used as raw materials to spin monofilaments, the spinning continuity was poor, the strength of the resulting monofilaments was low, and the light transmittance and haze were also low. This was due to the uneven dispersion of ZnO in PA56.

[0084] When the second hot air draw ratio is too high, at 1.6 times, although PA56 / PET / ZnO monofilaments have good spinnability, their tensile strength decreases, and their transparency and haze become low.

[0085] When PET is replaced with PA56, the dispersion of ZnO in the PA56 / ZnO prepared 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 becomes difficult for 2% PET to encapsulate 1% ZnO. This leads to a decrease in ZnO dispersibility, reduced spinnability of monofilaments, and decreased transparency and haze.

[0087] Example 2

[0088] A PA56 monofilament that simultaneously satisfies high strength, high haze, and high transparency is composed of polypropylene (PP), MgO nanoparticles with a particle size of 40nm, and PA56.

[0089] Its preparation method is as follows:

[0090] (1) Single granulation:

[0091] Polypropylene (PP) and MgO nanoparticles with a particle size of 40 nm were premixed in a high-speed mixer for 5 min, and then melt-blended and granulated in a twin-screw mixer at a granulation temperature of 195℃ and a screw speed of 400 rpm to obtain PP / MgO blended chips; the PP / MgO blended chips were vacuum dried at 120℃ for 24 h for later use.

[0092] (2) Secondary granulation:

[0093] PA56 and PP / MgO blended chips were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw mixer at a temperature of 275℃ 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℃ for 24 hours for later use.

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

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

[0096] The mass ratio of PA56, PP, and MgO is 95:5:0.5.

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

[0098] Example 3

[0099] A PA56 monofilament that simultaneously satisfies high strength, high haze, and high transparency is composed of polypropylene terephthalate (PTT), copper oxide (CuO), and PA56.

[0100] Its preparation method is as follows:

[0101] (1) Single granulation:

[0102] Polypropylene terephthalate (PTT) and copper oxide (CuO) were premixed in a high-speed mixer for 8 minutes, and then melt-blended and granulated in a twin-screw mixer at a temperature of 240°C and a screw speed of 420 rpm to obtain PTT / CuO blended chips. The obtained PTT / CuO blended chips were vacuum dried at 120°C for 24 hours for later use.

[0103] (2) Secondary granulation:

[0104] PA56 and PTT / CuO blended chips were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw mixer at a temperature of 280℃ 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℃ for 24 hours for later use.

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

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

[0107] The mass ratio of PA56, PTT, and CuO is 90:10:0.8.

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

[0109] Example 4

[0110] A PA56 monofilament that simultaneously satisfies high strength, high haze, and high transparency is composed of polyethylene (PE), alumina (Al2O3) powder with a particle size of 30nm, and PA56.

[0111] Its preparation method is as follows:

[0112] (1) Single granulation:

[0113] Polyethylene (PE) and alumina (Al2O3) powder with a particle size of 30 nm were premixed in a high-speed mixer for 5 min, and then melt-blended and granulated in a twin-screw mixer at a granulation temperature of 190℃ and a screw speed of 400 rpm to obtain PE / Al2O3 blended chips. The PE / Al2O3 blended chips were then vacuum-dried at 100℃ for 36 h for later use.

[0114] (2) Secondary granulation:

[0115] PA56 and PE / Al2O3 blended chips were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw mixer at a temperature of 280℃ 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℃ for 36 hours for later use.

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

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

[0118] The mass ratio of PA56, PE, and Al2O3 is 95:5:0.5.

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

[0120] Example 5

[0121] A PA56 monofilament that simultaneously satisfies high strength, high haze, and high transparency is composed of polybutylene succinate (PBT), cuprous oxide (Cu2O), and PA56.

[0122] Its preparation method is as follows:

[0123] (1) Single 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 mixer at a temperature of 240°C and a screw speed of 450 rpm to obtain PBT / Cu2O blended chips. The obtained PBT / Cu2O blended chips were vacuum dried at 100°C for 24 hours for later use.

[0125] (2) Secondary granulation:

[0126] PA56 and PBT / Cu2O blended chips were premixed in a high-speed mixer for 5 minutes, and then melt-blended and granulated in a twin-screw mixer at a temperature of 280℃ 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℃ for 24 hours for later use.

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

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

[0129] The mass ratio of PA56, PBT, and Cu2O is 90:10:0.5.

[0130] The spinning temperature is 290℃; the first-roll winding speed is 20m / min, and the water bath temperature is 20℃; the hot steam stretching temperature is 85℃, and the stretching ratio is 5.4; the second-stage hot air stretching temperature is 180℃, and the stretching ratio is 1.2; the heat setting temperature is 200℃.

[0131] The performance test results of the obtained PA56 monofilament are as follows:

[0132] Table 2 Test Results

[0133] 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 with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A method for preparing polyamide 56 monofilaments that simultaneously meet the requirements of high strength, high haze, and high transparency, characterized in that, Includes the following steps: (1) Single granulation: High molecular weight polymers and inorganic nanoparticles are melt-blended and granulated to obtain high molecular weight polymer / inorganic nanoparticle blended slices; (2) Secondary granulation: High molecular weight polymer / inorganic nanoparticle blend chips were melt-blended and granulated with polyamide 56 to obtain polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips. (3) Preparation of polyamide 56 monofilament: Polyamide 56 monofilaments were obtained by melt spinning using polyamide 56 / high molecular weight polymer / inorganic nanoparticle blend chips as raw materials through melt extrusion, water bath cooling, hot steam stretching, hot air stretching and heat setting. The process includes: melt spinning (horizontal melt spinning) at a spinning temperature of 265-310℃; a first-roll winding speed of 18-20 m / min and a water bath temperature of 10-20℃; a hot steam drawing temperature of 60-95℃ and a drawing ratio of 2-8; a second-stage hot air drawing temperature of 120-195℃ and a drawing ratio of 1.0-1.5; and a heat setting temperature of 120-230℃. The particle size of inorganic nanoparticles is 1~350nm, and the size of inorganic nanoparticle aggregates does not exceed 700nm; The high molecular weight polymer dispersion carrier exists in the form of microfibers in the monofilament, with a diameter not exceeding 700 nm; The high molecular weight polymer is one of polyethylene terephthalate (PET), polypropylene (PP), polypropylene terephthalate (PTT), polyethylene (PE), and polybutylene succinate (PBT). When the high molecular weight polymer is polyethylene terephthalate (PET), the inorganic nanoparticles are zinc oxide (ZnO), and the mass ratio of polyamide 56, polyethylene terephthalate (PET), and zinc oxide (ZnO) is 90:10:1; When the high molecular weight polymer is polypropylene (PP), the inorganic nanoparticles are MgO, and the mass ratio of polyamide 56, polypropylene (PP), and MgO is 95:5:0.

5. When the high molecular weight polymer is polypropylene terephthalate (PTT), the inorganic nanoparticles are copper oxide (CuO), and the mass ratio of polyamide 56, polypropylene terephthalate (PTT), and copper oxide (CuO) is 90:10:0.

8. When the high molecular weight polymer is polyethylene (PE), the inorganic nanoparticles are alumina (Al2O3), and the mass ratio of polyamide 56, polyethylene (PE), and alumina (Al2O3) is 95:5:0.

5. When the high molecular weight polymer is polybutylene succinate (PBT), the inorganic nanoparticles are cuprous oxide (Cu2O), and the mass ratio of polyamide 56, polybutylene succinate (PBT), and cuprous oxide (Cu2O) is 90:10:0.

5.

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

3. The polyamide 56 monofilament prepared by the method of claim 1 or 2 simultaneously satisfies the requirements of high strength, high haze, and high transparency.

4. The polyamide 56 monofilament according to claim 3, which simultaneously satisfies high strength, high haze, and high transparency, is characterized in that... Simultaneously meeting the requirements of high strength, high haze, and high transparency, polyamide 56 monofilament... 3.0 cN / dtex, transmittance 80%, Haze 70%.

5. A polyamide 56 yarn that simultaneously satisfies high strength, high haze, and high transparency, characterized in that, The polyamide 56 monofilament described in claim 3 simultaneously satisfies the requirements of high strength, high haze, and high transparency.

6. A polyamide 56 fabric that simultaneously satisfies high strength, high haze, and high transparency, characterized in that, The polyamide 56 monofilament described in claim 3 simultaneously satisfies the requirements of high strength, high haze, and high transparency.

7. An automotive interior, characterized in that, The polyamide 56 monofilament described in claim 3 simultaneously satisfies the requirements of high strength, high haze, and high transparency.

8. The application of the polyamide 56 monofilament as described in claim 3, which simultaneously satisfies high strength, high haze, and high transparency, in the field of functional materials.

9. The application of the polyamide 56 yarn with high strength, high haze, and high transparency as described in claim 5 in the field of functional materials.

10. The application of the polyamide 56 fabric with high strength, high haze and high transparency as described in claim 6 in the field of functional materials.

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