Orange nylon material for wire harness connector of new energy automobile and preparation method of orange nylon material

Abstract

The invention discloses an orange nylon material for a wire harness connector of a new energy automobile and a preparation method of the orange nylon material, and relates to the technical field of high polymer material modification. Glass fibers; a halogen-free flame retardant; an antioxidant; a nucleating agent; a silane coupling agent; a lubricant; a heat stabilizer; and a toner. The high-performance nylon material is successfully prepared through innovative technological process design, the chromatic aberration delta E of the nylon material is stably controlled within 2.0, the flame retardant rating reaches UL94 V-0, the mechanical property retention rate exceeds 80% after heat aging is conducted for 1000 hours at the temperature of 150 DEG C, toughness is good, and the strict application requirements of new energy automobile connectors are completely met; the vacuum devolatilization system of the double-screw extruder is improved, so that the screen is regularly replaced and cleaned under the non-stop condition, continuous production is guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of polymer material modification technology, specifically to an orange nylon material for new energy vehicle wiring harness connectors and its preparation method. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source (or use conventional vehicle fuels but adopt new on-board power devices), integrating advanced technologies in vehicle power control and drive, resulting in vehicles with advanced technical principles, new technologies, and new structures. Automotive connectors (also known as automotive connectors) are core components in automotive electronic systems that realize circuit connections. They belong to the basic components in the field of electronic engineering and are widely used in the signal transmission and power supply of on-board electronic modules. High-voltage wiring harness connectors for new energy vehicles require the use of flame-retardant nylon materials.

[0003] Current flame-retardant nylon materials typically involve feeding all raw materials (resin, flame retardant, glass fiber, pigment, etc.) into the extruder's main feed port in a single operation. This process has significant drawbacks: the heat-sensitive flame retardant remains in the high-temperature melting zone for too long, easily leading to partial decomposition, reduced flame retardant efficiency, and yellowing of the material; simultaneously, the glass fiber exerts a strong shearing and diluting effect on the pigment, resulting in uneven product color and poor long-term stability, making it difficult to meet the stringent requirements of new energy vehicle connectors for color durability (ΔE≤2), high flame retardancy (UL94 V-0), and long-term heat resistance (performance retention rate >80% at 150℃ / 1000h).

[0004] Furthermore, during the preparation of this type of nylon material, especially near the extrusion stage, a certain amount of volatile substances (such as gases, moisture, monomers, and low molecular weight additives) are produced in the mixed material. These need to be removed from the equipment using a vacuum system. If these volatile substances are not removed in time, air bubbles will remain in the mixed material, reducing its flowability and affecting the uniformity of the mixture. However, these volatile substances also carry a certain amount of solid impurities during removal. If these impurities are not removed regularly, they will accumulate in the vacuum equipment, clogging the pipes, causing fluctuations in vacuum levels, and ultimately affecting the plasticization and extrusion quality of the material.

[0005] In view of this, the applicant has developed an orange nylon material for wiring harness connectors in new energy vehicles and its preparation method, which can solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing flame-retardant nylon materials used in orange connectors for new energy vehicles. Specifically, traditional one-time feeding processes lead to the easy decomposition of heat-sensitive flame retardants (affecting flame retardant efficiency and causing yellowing), and excessive shearing of the pigment by glass fibers results in uneven color and poor stability. Therefore, these materials cannot simultaneously meet the comprehensive requirements of high flame retardancy, long-term high-temperature color stability, excellent heat aging resistance, and good toughness. This invention provides an orange nylon material for new energy vehicle wiring harness connectors and its preparation method. A second objective of this invention is to improve the vacuum devolatilization system of a twin-screw extruder, enabling regular screen replacement and cleaning without stopping the machine, ensuring uninterrupted production and improving production efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an orange nylon material for wiring harness connectors in new energy vehicles, which is prepared from the following components in parts by weight: 40 to 60 parts of nylon resin; 25 to 35 parts glass fiber; 15 to 25 parts of halogen-free flame retardant; Antioxidant 0.6 to 1.5 parts; Nucleating agent: 0.2 parts to 1 part; 0.5 to 1 part of silane coupling agent; Lubricant: 0.3 to 2 parts; Heat stabilizer: 0.3 parts to 1 part; 0.5 to 2 parts of color powder.

[0008] The nylon resin is one or more of PA66, PA6, PA6I, PA66 / PA6I blend resin or PA1010.

[0009] The halogen-free flame retardant is one or more of aluminum diethylphosphite (ADP), melamine polyphosphate (MPP), melamine cyanurate (MCA), zinc borate, aluminum hydroxide, or aluminum oxide.

[0010] The heat stabilizer is a copper salt stabilizer, preferably one or more of HK-306, SR-336, H3336 or SH3360.

[0011] The antioxidant comprises a primary antioxidant and a secondary antioxidant. The primary antioxidant is one or more of antioxidant 1098, antioxidant 3114, or antioxidant Deox 1790; the secondary antioxidant is one or more of antioxidant 168, antioxidant S-9228, or antioxidant Revonox 608.

[0012] The lubricant is one or more of pentaerythritol stearate (PETS), ethylene bis-stearamide (TAF), or silicone powder.

[0013] The silane coupling agent is one or more of KH-550, KH-560 or KH-570.

[0014] The nucleating agent is one or more of talc, silica, carboxylates, phosphates, sorbitol, or nanopolymer nucleating agents.

[0015] The color powder is a highly heat-resistant organic or inorganic orange pigment.

[0016] A method for preparing orange nylon material for wiring harness connectors in new energy vehicles includes the following steps: Step 1: Raw material premixing: Nylon resin, antioxidant, nucleating agent, silane coupling agent, lubricant, heat stabilizer and color powder are put into a high-speed heating mixer for premixing to obtain the main feed premix. Step 2: Main feed metering and conveying: The main feed premix obtained in Step 1 is conveyed to the main feed hopper via a vacuum feeder, and continuously conveyed at a stable rate by a loss-in-weight metering feeder installed below it. Step 3: Main material melting and plasticizing: The metered main feed premix is ​​added from the main feed port of the co-conveying twin-screw extruder, and begins to melt and initially mix under the action of the melting and plasticizing module at the front of the extruder; Step 4: Precise lateral feeding of flame retardant: The halogen-free flame retardant is precisely injected into the partially molten polymer matrix through the first lateral loss-in-weight metering feeder at the first side feed port located in the rear of the extruder barrel; Step 5: Lateral introduction and impregnation of glass fiber: The glass fiber is introduced into the melt through the second lateral weight loss metering feeder at the second side feed port located downstream of the first side feed port, and is cut, dispersed and impregnated by the high shear melt impregnation module; Step Six: Final Homogenization and Deviation of Melt: The melt containing all components is efficiently homogenized in the rear section of the extruder via a kneading block assembly element, and volatile components are removed by a vacuum devolatilization system; Step 7: Extrusion Cooling and Pelletizing: The homogeneous melt that has undergone sufficient devolatilization is extruded through the multi-hole die head template of a twin-screw extruder that is conveyed in the same direction. After being cooled and solidified in a cooling water tank, it is pelletized by a high-speed pelletizer to obtain orange nylon material.

[0017] As a further aspect of the present invention: the main motor speed of the twin-screw extruder is controlled at 300-500 r / min, and the main feed speed is controlled at 10-20 r / min; the twin-screw extruder is equipped with a total of independent temperature control modules from the feed port to the die head, and the temperature control range is: Zone 1 230-250℃, Zones 2 to 11 265-285℃, Zone 12 270-290℃.

[0018] As a further embodiment of the present invention: the twin-screw extruder includes a body and a screen. A main feed port is fixedly connected to the top of the body, and a main feed hopper is fixedly connected to the top of the main feed port. Two natural vents are provided at one end of the top of the body near the main feed port. Two side feed ports are fixedly connected to one side of the body. A vacuum vent is fixedly connected to the top of the front end of the body, and a vacuum tank is fixedly connected to the top of the vacuum vent. A vacuum tube is fixedly connected to the outer wall of one side of the vacuum tank. The screen is positioned above the vacuum vent. The replacement operation is performed by a replacement mechanism, which includes a replacement chamber fixedly connected to the outer wall of the vacuum tank. A first motor is installed at the bottom of the replacement chamber, and a rotating rod is connected to the output end of the first motor. The rotating rod is rotatably connected to the inner wall of the vacuum tank and the replacement chamber. Rotating seats are symmetrically fixedly connected to both ends of the rotating rod. An installation groove is provided at the top of the rotating seat. The screen is slidably connected to the inner wall of the installation groove. An installation frame is slidably connected to the top of the screen on the inner wall of the installation groove. A positioning groove is provided on the outer wall of the installation frame.

[0019] As a further embodiment of the present invention: the replacement mechanism further includes a positioning block, which is slidably connected to the interior of the rotating seat and extends into the inner cavity of the mounting groove. A first spring is connected between the positioning block and the rotating seat. A first semi-circular surface is provided at one end of the positioning block located in the inner cavity of the mounting groove. A spur gear is rotatably connected to the interior of the rotating seat at the bottom end of the positioning block. A slider is slidably connected to the interior of the rotating seat at the bottom end of the spur gear. The slider extends out of the rotating seat. A fixing plate is fixedly connected to the inner wall of the replacement chamber. A second motor is installed at the top of the vacuum tank. A threaded rod is connected to the output end of the second motor. A partition extending into the inner wall of the replacement chamber is slidably connected to the interior of the vacuum tank. The threaded rod extends into the interior of the partition. A groove is provided at the bottom end of the partition. Sealing elements are provided on the outer wall of the partition and the inner wall of the groove. A replacement port is provided at the top of the replacement chamber. The replacement port is opened and closed by a switching mechanism.

[0020] As a further embodiment of the present invention: the switching mechanism includes a connecting block, the connecting block being threadedly connected to the inner wall of the replacement port, a cover plate being fixedly connected to the top of the connecting block, an annular groove being formed on the outer wall of the connecting block, a displacement plate being fixedly connected to one side of the outer wall of the partition, a displacement groove being formed on the outer wall of the displacement plate inside the vacuum tank, a lower pressure plate extending into the inner cavity of the displacement groove being slidably connected inside the vacuum tank, an insertion rod extending into the inner cavity of the replacement port being slidably connected inside the vacuum tank, a second spring being connected between the insertion rod and the replacement chamber, a push rod being fixedly connected to the outer wall of the lower pressure plate, an inclined groove being formed on the outer wall of the insertion rod, the push rod contacting the inclined groove, a first sealing ring being fixedly connected to the bottom end of the cover plate outside the connecting block, a vent being formed at the top of the cover plate, a sealing cap being threadedly connected to the outer wall of the vent, and a second sealing ring being fixedly connected to the top of the inner wall of the sealing cap.

[0021] As a further embodiment of the present invention: the slider extends from one end of the rotating seat and is provided with a second semi-circular surface; the outer walls of the positioning block and the slider are both provided with toothed grooves; the toothed grooves mesh with the spur gear; and the outer wall of the mounting bracket fits against the inner wall of the mounting groove.

[0022] As a further embodiment of the present invention: the top of the partition plate is provided with a threaded hole, the threaded hole is matched with the threaded rod, and the inner wall of the groove is in contact with the outer wall of the rotating rod.

[0023] As a further embodiment of the present invention: the inner walls of the sealing cap and the replacement port are provided with internal threads, and the outer walls of the vent and the connecting block are provided with external threads, wherein the external threads match the internal threads.

[0024] As a further embodiment of the present invention: the outer wall of the displacement plate is in contact with the inner wall of the displacement groove, the outer wall of the insertion rod is provided with a through groove, the through groove is for the lower pressure plate to slide, and the outer wall of one end of the insertion rod is in contact with the inner wall of the annular groove.

[0025] Compared with the prior art, the beneficial effects of the present invention are: 1. Through innovative process design, this invention successfully prepared a high-performance material: its color difference ΔE is stably controlled within 2.0, its flame retardant rating reaches UL94 V-0, and its mechanical properties retain more than 80% after 1000 hours of thermal aging at 150℃, and it has good toughness, which fully meets the stringent application requirements of connectors for new energy vehicles.

[0026] 2. This invention further improves the key production equipment – ​​the twin-screw extruder – based on the improved preparation process. The twin-screw extruder incorporates a replacement mechanism and a switching mechanism. The partition moves downwards to separate the replacement chamber and the vacuum tank. Outside air enters the replacement chamber through the vent. The cover is removed, opening the replacement port. A new screen is placed into the mounting groove below the replacement port, and the partition is then placed into the mounting groove. The replacement port is then closed, and the partition moves to open the replacement chamber, exchanging the positions of the two rotating seats. At this point, the positioning block, under the force of the first spring, engages in the positioning groove, automatically fixing the mounting frame. This completes the screen replacement operation, facilitating screen replacement without stopping the machine and avoiding disruption to material production due to screen replacement. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the twin-screw extruder described in this invention; Figure 2 This is a schematic diagram of the changing chamber of the twin-screw extruder described in this invention; Figure 3 This is a schematic diagram of the internal structure of the changing chamber of the twin-screw extruder described in this invention; Figure 4 This is a schematic diagram of the internal structure of the rotating seat of the twin-screw extruder described in this invention; Figure 5 The twin-screw extruder described in this invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the partition of the twin-screw extruder described in this invention; Figure 7 This is a schematic diagram of the installation of the cover plate of the twin-screw extruder described in this invention; Figure 8 This is a schematic diagram of the insert rod of the twin-screw extruder described in this invention; Figure 9 This is a schematic diagram of the internal structure of the connecting block of the twin-screw extruder described in this invention.

[0028] In the diagram: 1. Machine body; 2. Main feed inlet; 3. Main feed hopper; 4. Side feed inlet; 5. Natural exhaust port; 6. Vacuum exhaust port; 7. Vacuum tank; 8. Changing mechanism; 801. Changing chamber; 802. First motor; 803. Rotating rod; 804. Rotating seat; 805. Mounting slot; 806. Mounting bracket; 807. Positioning slot; 808. Positioning block; 809. First spring; 810. First semicircular surface; 811. Spur gear; 812. Slider; 813. Fixing plate; 814. Second motor 815. Threaded rod; 816. Partition plate; 817. Seal; 818. Replacement port; 819. Groove; 9. Switching mechanism; 901. Cover plate; 902. Connecting block; 903. Annular groove; 904. Displacement plate; 905. Displacement groove; 906. Insert rod; 907. Second spring; 908. Lower pressure plate; 909. Push rod; 910. Inclined groove; 911. First sealing ring; 912. Vent; 913. Sealing cover; 914. Second sealing ring; 10. Vacuum tube; 11. Screen. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0031] Example 1

[0032] A method for preparing orange nylon material for wiring harness connectors in new energy vehicles includes the following steps: Step 1: Raw material premixing: Weigh 40.0 kg of PA66 resin, 0.4 kg of antioxidant 1098, 0.2 kg of talc, 0.3 kg of pentaerythritol stearate (PETS), 0.3 kg of heat stabilizer HK-306, 0.7 kg of silane coupling agent KH-550, and 0.7 kg of orange inorganic color powder. Put them into a high-speed heating mixer and mix at 80°C and 600 r / min for 5 minutes to obtain the main feed premix. Step 2: Main feed metering and conveying: The main feed premix obtained in Step 1 is conveyed to the main feed hopper 3 via a vacuum feeder, and continuously conveyed at a rate of 150 kg / h through the loss-in-weight metering feeder installed below it. Step 3: Main material melting and plasticizing: The metered main feed premix is ​​added from the main feed port 2 of the co-directional twin-screw extruder, and begins to melt and initially mix under the action of the melting and plasticizing module in the front section of the extruder (zones 1 to 4, temperature set at 240-275℃); Step 4: Precise side feeding of flame retardant: 25.0 kg of aluminum diethyl phosphite (ADP) is precisely injected into the partially molten polymer matrix through the first side feed port 4 located in the seventh zone of the extruder barrel via the first side loss-in-weight metering feeder. Step 5: Lateral introduction and impregnation of glass fiber: 25.0 kg of alkali-free chopped glass fiber is introduced into the melt through the second lateral loss-in-weight metering feeder at the second side feed port 4 in the eighth zone, and then cut, dispersed and impregnated through the high-shear melt impregnation module; Step Six: Final Homogenization and Deviation of Melt: The melt containing all components is efficiently homogenized in the rear section of the extruder (zones nine to eleven, temperature 275°C) by a kneading block assembly element, and volatile components (volatile components here mainly refer to volatile substances generated or released during the high-temperature melt blending process) are removed by a vacuum devolatilization system (vacuum degree -0.095MPa) located in zone ten. Step 7: Extrusion Cooling and Pelletizing: The fully devolatilized homogeneous melt is extruded through the multi-hole die head template (die head temperature 280℃) of a co-conveying twin-screw extruder. After cooling and solidification in a cooling water tank, it is pelletized by a high-speed pelletizer to obtain 92kg of orange nylon material. The twin-screw extruder operates at a speed of 400r / min.

[0033] In this embodiment: Through innovative process design, the present invention successfully prepared a high-performance material with a color difference ΔE that is stably controlled within 2.0, a flame retardant rating of UL94 V-0, a mechanical property retention rate of over 80% after 1000 hours of thermal aging at 150°C, and good toughness, fully meeting the stringent application requirements of connectors for new energy vehicles.

[0034] Please refer to this carefully. Figures 2 to 6 The twin-screw extruder includes a body 1 and a screen 11. A main feed port 2 is fixedly connected to the top of the body 1, and a main feed hopper 3 is fixedly connected to the top of the main feed port 2. Two natural vents 5 are provided at one end of the top of the body 1 located at the main feed port 2. Two side feed ports 4 are fixedly connected to one side of the body 1. A vacuum vent 6 is fixedly connected to the top of the front end of the body 1. A vacuum tank 7 is fixedly connected to the top of the vacuum vent 6. A vacuum tube 10 is fixedly connected to the outer wall of one side of the vacuum tank 7. The screen 11 is located above the vacuum vent 6. The screen 11 is replaced by a replacement mechanism 8.

[0035] The replacement mechanism 8 includes a replacement chamber 801, which is fixedly connected to the outer wall of the vacuum tank 7. A first motor 802 is installed at the bottom of the replacement chamber 801. A rotating rod 803 is connected to the output end of the first motor 802. The rotating rod 803 is rotatably connected to the inner wall of the vacuum tank 7 and the replacement chamber 801. Rotating seats 804 are symmetrically fixedly connected to both ends of the rotating rod 803. An installation groove 805 is provided at the top of the rotating seat 804. A screen 11 is slidably connected to the inner wall of the installation groove 805. An installation frame 806 is slidably connected to the top of the screen 11 on the inner wall of the installation groove 805. A positioning groove 807 is provided on the outer wall of the installation frame 806. The replacement mechanism 8 also includes a positioning block 808, which is slidably connected to the inside of the rotating seat 804 and extends into the inner cavity of the installation groove 805. A first spring 809 is connected between the positioning block 808 and the rotating seat 804. A first semi-circular surface 810 is provided at one end of the inner cavity of the mounting groove 805. A spur gear 811 is rotatably connected to the bottom end of the positioning block 808 inside the rotating seat 804. A slider 812 is slidably connected to the bottom end of the spur gear 811 inside the rotating seat 804. The slider 812 extends out of the rotating seat 804. A fixing plate 813 is fixedly connected to the inner wall of the replacement chamber 801. A second motor 814 is installed at the top of the vacuum tank 7. A threaded rod 815 is connected to the output end of the second motor 814. A partition 816 extending to the inner wall of the replacement chamber 801 is slidably connected inside the vacuum tank 7. The threaded rod 815 extends into the interior of the partition 816. A groove 819 is provided at the bottom end of the partition 816. A sealing element 817 is provided on both the outer wall of the partition 816 and the inner wall of the groove 819. A replacement port 818 is provided at the top of the replacement chamber 801. The replacement port 818 is opened and closed by a switching mechanism 9.

[0036] In this embodiment: the screen 11 is used to filter the material entering the vacuum exhaust port 6; the first motor 802 drives the rotating rod 803 to rotate, and the rotating rod 803 drives the rotating seat 804 to move. When the slider 812 contacts the fixed plate 813, the slider 812 is displaced by force. The displacement of the slider 812 drives the spur gear 811 to rotate, and the rotation of the spur gear 811 drives the positioning block 808 to move, so that only the first semicircular surface 810 of the positioning block 808 is located in the mounting groove 805. Inner cavity; when the slider 812 separates from the fixed plate 813, the positioning block 808 is engaged into the positioning groove 807 by the elastic force of the first spring 809, fixing the mounting bracket 806 in the mounting groove 805; the second motor 814 drives the threaded rod 815 to rotate, and the rotation of the threaded rod 815 drives the partition 816 to move. The partition 816 moves downward, closing the gap between the replacement chamber 801 and the vacuum tank 7. At the same time, the rotating rod 803 is inserted into the groove 819, and the sealing element 817 is used to improve the sealing of the connection.

[0037] Please refer to this carefully. Figures 7 to 9 The switching mechanism 9 includes a connecting block 902, which is threadedly connected to the inner wall of the replacement port 818. A cover plate 901 is fixedly connected to the top of the connecting block 902. An annular groove 903 is formed on the outer wall of the connecting block 902. A displacement plate 904 is fixedly connected to one side of the outer wall of the partition plate 816. A displacement groove 905 is formed on the outer wall of the displacement plate 904 inside the vacuum tank 7. A lower pressure plate 908 extending into the inner cavity of the displacement groove 905 is slidably connected inside the vacuum tank 7. A device extending into the inner cavity of the replacement port 818 is also slidably connected inside the vacuum tank 7. Insert rod 906, a second spring 907 is connected between insert rod 906 and replacement chamber 801, push rod 909 is fixedly connected to the outer wall of lower pressure plate 908, inclined groove 910 is opened on the outer wall of insert rod 906, push rod 909 contacts inclined groove 910, the bottom end of cover plate 901 is located outside the connecting block 902 and a first sealing ring 911 is fixedly connected, the top end of cover plate 901 is opened with vent 912, sealing cover 913 is threadedly connected to the outer wall of vent 912, and a second sealing ring 914 is fixedly connected to the top of the inner wall of sealing cover 913.

[0038] In this embodiment: when the partition 816 moves downward, the displacement plate 904 moves and slides in the displacement groove 905. The displacement plate 904 contacts the lower pressure plate 908, causing the lower pressure plate 908 to move. The displacement of the lower pressure plate 908 causes the push rod 909 to move. The displacement of the push rod 909 pushes the insertion rod 906 through the inclined groove 910, causing compression on the second spring 907. The insertion rod 906 moves out of the annular groove 903, thereby allowing the cover plate 901 to be opened. When the partition 816 moves upward, the insertion rod 906 is engaged in the annular groove 903 by the elastic force of the second spring 907, reinforcing the cover plate 901 and the connecting block 902.

[0039] Rotate the sealing cover 913 to remove it from the vent 912 via the thread. The second sealing ring 914 is used to improve the sealing performance between the sealing cover 913 and the vent 912. Rotate the cover plate 901, which drives the connecting block 902 to rotate. The connecting block 902 rotates and moves out of the replacement port 818 via the thread. The first sealing ring 911 is used to improve the sealing performance between the cover plate 901 and the replacement port 818.

[0040] When replacing the screen 11, the second motor 814 drives the partition 816 downward to separate the replacement chamber 801 and the vacuum tank 7. Simultaneously, the insertion rod 906 moves out of the annular groove 903, releasing the fixation of the cover plate 901. Then, the sealing cover 913 is rotated and removed, allowing air to enter the replacement chamber 801 through the vent 912, connecting it to the outside. Afterward, the cover plate 901 is rotated and removed, opening the replacement port 818. The new screen 11 is then placed into the mounting slot 805 below the replacement port 818. Inside, the partition 816 is placed into the mounting slot 805, and the first semicircular surface 810 of the positioning block 808 engages into the positioning slot 807, positioning the mounting frame 806. Then, the replacement port 818 is closed, and the partition 816 moves to open the replacement chamber 801. The rotating rod 803 rotates, causing the rotating seat 804 to move, and the two rotating seats 804 exchange positions. At this time, the positioning block 808, under the elastic force of the first spring 809, engages into the positioning slot 807, automatically fixing the mounting frame 806, thus completing the replacement of the screen 11. The above operation can then be repeated to remove the old screen 11. This design facilitates the replacement of the screen 11 without stopping the machine, avoiding disruption to normal production operations.

[0041] Please refer to this carefully. Figures 2 to 6The slider 812 extends out of the rotating seat 804 and is provided with a second semi-circular surface. The outer walls of the positioning block 808 and the slider 812 are provided with toothed grooves, which mesh with the spur gear 811. The outer wall of the mounting bracket 806 fits against the inner wall of the mounting groove 805.

[0042] In this embodiment: the first motor 802 drives the rotating rod 803 to rotate, the rotating rod 803 drives the rotating seat 804 to move, when the slider 812 contacts the fixed plate 813, the slider 812 is subjected to force and moves, the slider 812 moves and drives the spur gear 811 to rotate, the spur gear 811 rotates and drives the positioning block 808 to move.

[0043] Please refer to this carefully. Figures 2 to 6 The top of the partition 816 is provided with a threaded hole, which matches the threaded rod 815. The inner wall of the groove 819 fits against the outer wall of the rotating rod 803.

[0044] In this embodiment: the second motor 814 drives the threaded rod 815 to rotate, the rotation of the threaded rod 815 drives the partition 816 to move, the partition 816 moves downward, and closes the gap between the replacement chamber 801 and the vacuum tank 7. At the same time, the rotating rod 803 is inserted into the groove 819.

[0045] Please refer to this carefully. Figures 7 to 9 The inner walls of the sealing cap 913 and the replacement port 818 are provided with internal threads, and the outer walls of the vent 912 and the connecting block 902 are provided with external threads, which are matched with the internal threads.

[0046] In this embodiment: the sealing cover 913 is rotated and removed from the vent 912 by means of threads. The second sealing ring 914 is used to improve the sealing performance between the sealing cover 913 and the vent 912. The cover plate 901 is rotated, and the rotation of the cover plate 901 drives the connecting block 902 to rotate. The connecting block 902 rotates and moves out of the replacement port 818 by means of threads. The first sealing ring 911 is used to improve the sealing performance between the cover plate 901 and the replacement port 818.

[0047] Please refer to this carefully. Figures 7 to 9 The outer wall of the displacement plate 904 is in contact with the inner wall of the displacement groove 905. The outer wall of the insertion rod 906 is provided with a through groove for the lower pressure plate 908 to slide. One end of the outer wall of the insertion rod 906 is in contact with the inner wall of the annular groove 903.

[0048] In this embodiment: when the partition 816 moves downward, the displacement plate 904 is displaced and slides in the displacement groove 905. The displacement plate 904 contacts the lower pressure plate 908, causing the lower pressure plate 908 to be displaced. The displacement of the lower pressure plate 908 causes the push rod 909 to be displaced. The displacement of the push rod 909 pushes the insertion rod 906 to be displaced through the inclined groove 910.

[0049] Example 2

[0050] A method for preparing orange nylon material for wiring harness connectors in new energy vehicles includes the following steps: Step 1: Raw material premixing: Weigh 50.0 kg of PA66 / PA6I blended resin, 0.6 kg of antioxidant 3114, 0.3 kg of carboxylate nucleating agent, 0.7 kg of ethylene bis-stearamide (TAF), 0.5 kg of heat stabilizer SR-336, 0.8 kg of silane coupling agent KH-550, and 1.2 kg of orange organic pigment. Put them into a high-speed heating mixer and mix at 800 r / min for 4 minutes at 85℃ to obtain the main feed premix. Step 2: Main feed metering and conveying: The main feed premix obtained in Step 1 is conveyed to the main feed hopper 3 via a vacuum feeder, and continuously conveyed at a rate of 200 kg / h through the loss-in-weight metering feeder installed below it. Step 3: Main material melting and plasticizing: The metered main feed premix is ​​added from the main feed port 2 of the co-current twin-screw extruder, and begins to melt and initially mix under the action of the melting and plasticizing module in the front section of the extruder (zones 1 to 4, temperature set at 245-280℃); Step 4: Precise side feeding of flame retardant: 20.0 kg of the compound of melamine polyphosphate (MPP) and melamine cyanurate (MCA) (mass ratio 3:1, i.e., MPP 15.0 kg, MCA 5.0 kg) is precisely injected through the first side feed port 4 located in the seventh zone of the extruder barrel via the first side loss-in-weight metering feeder; Step 5: Lateral introduction and impregnation of glass fiber: 30.0 kg of alkali-free chopped glass fiber is introduced into the melt through the second lateral loss-in-weight metering feeder at the second side feed port 4 located in the eighth zone; Step Six: Final Homogenization and Deviation of Melt: The melt containing all components is efficiently homogenized in the rear section of the extruder (zones nine to eleven, temperature 280°C) by a kneading block assembly element, and volatile components are removed by a vacuum devolatilization system (vacuum degree -0.098MPa) located in zone ten. Step 7: Extrusion Cooling and Pelletizing: The fully devolatilized homogeneous melt is extruded through a die head (temperature 285℃), cooled and solidified in a cooling water tank, and then pelletized to obtain 103 kg of orange nylon material. The twin-screw extruder rotates at 450 r / min.

[0051] The preparation equipment is the same as in Example 1, and will not be described again here.

[0052] Example 3

[0053] A method for preparing orange nylon material for wiring harness connectors in new energy vehicles includes the following steps: Step 1: Raw material premixing: Weigh 60.0 kg of PA1010 resin, 1.0 kg of antioxidant Deox1790, 0.5 kg of nano-polymer nucleating agent, 1.5 kg of silicone powder, 0.8 kg of heat stabilizer SH3360, 1.0 kg of silane coupling agent KH-550, and 2.0 kg of orange composite color powder, and put them into a high-speed heating mixer. Mix at 90℃ and 1000 r / min for 3 minutes to obtain the main feed premix. Step 2: Main feed metering and conveying: The main feed premix obtained in Step 1 is conveyed to the main feed hopper 3 via a vacuum feeder and continuously conveyed at a rate of 180 kg / h via a loss-in-weight metering feeder. Step 3: Main material melting and plasticizing: The metered main feed premix is ​​added from the main feed port 2 of the co-conveying twin-screw extruder and melted and plasticized in the front section of the extruder (zones 1 to 4, temperature set at 250-285℃); Step 4: Precise side feeding of flame retardant: 15.0 kg of zinc borate and aluminum hydroxide compound (mass ratio 1:1, i.e., 7.5 kg each) is precisely injected through the first side feed port 4 located in the seventh zone of the extruder barrel using the first side loss-in-weight metering feeder. Step 5: Lateral introduction and impregnation of glass fiber: 35.0 kg of alkali-free chopped glass fiber is introduced into the melt through the second lateral loss-in-weight metering feeder at the second side feed port 4 located in the eighth zone; Step Six: Final Homogenization and Deviation of Melt: The melt containing all components is homogenized in the back section of the extruder (zones nine to eleven, temperature 285°C) and devolatilized through a vacuum devolatilization system (vacuum degree -0.096MPa); Step 7: Extrusion Cooling and Pelletizing: The fully devolatilized homogeneous melt is extruded through a die head (temperature 290℃), cooled and solidified, and then pelletized to obtain 115 kg of orange nylon material. The twin-screw extruder rotates at 500 r / min.

[0054] The preparation equipment is the same as in Example 1, and will not be described again here. Comparative Example 1: One-time feeding process

[0055] The same raw materials as in Example 2 were used, namely, 50.0 kg of PA66 / PA6I blended resin, 30.0 kg of alkali-free chopped glass fiber, 20.0 kg of MPP / MCA compound flame retardant, 0.6 kg of antioxidant 3114, 0.3 kg of carboxylate nucleating agent, 0.7 kg of lubricant TAF, 0.5 kg of heat stabilizer SR-336, 0.8 kg of silane coupling agent KH-550, and 1.2 kg of orange organic pigment. The difference was that all raw materials were fed into the main feed port 2 at once and then melt-extruded and granulated.

[0056] The extrusion process parameters are the same as in Example 2, and will not be repeated here. Comparative Example 2: No Flame Retardant Control

[0057] The same preparation method as in Example 2 was used, except that the halogen-free flame retardant was not added to the formulation. Instead, 20.0 kg of the flame retardant was replaced in equal amounts with PA66 / PA6I blended resin, resulting in a total nylon resin feed amount of 70.0 kg for this batch. Other components and their amounts remained unchanged, including 0.8 kg of silane coupling agent KH-550. The preparation method was the same as in Example 2. Product Testing Methods and Data

[0058] The materials obtained in Examples 1-3 and Comparative Examples 1-2 were dried at 120°C for 4 hours, then injection molded into standard test strips, and their performance was tested according to the following method. The results are shown in Table 1. Test method:

[0059] 1. Color difference (ΔE): The color difference between the injection molded sample and the standard orange color swatch was measured using an X-Rite Ci7800 colorimeter, according to ASTM D2244 standard. The smaller the ΔE value, the better the color consistency.

[0060] 2. Flame retardant rating: According to UL-94 standard, a vertical burning test is conducted on a 1.6mm thick sample, and it is rated as V-0, V-1, V-2 or NR (no rating).

[0061] 3. Performance retention rate after thermal aging: The specimens were aged in a circulating air oven at 150℃±2℃ for 1000 hours, then cooled to room temperature. Tensile strength and notched impact strength were tested, and the retention rate was calculated by comparing the results with those before aging. Tensile strength was tested according to ISO 527-2 standard, and notched impact strength was tested according to ISO 179-1 standard.

[0062] 4. Initial mechanical properties: The tensile strength (ISO 527-2) and notched impact strength (ISO 179-1) of the specimens before aging were directly tested.

[0063] Table 1: Comparison of performance test results between the examples and the comparative examples

[0064] As shown in Table 1, the orange nylon materials prepared in Examples 1-3 of this invention have a color difference ΔE that is consistently controlled within 2.0, a flame retardant rating that reaches UL94 V-0, and a mechanical property (tensile strength and impact strength) retention rate of over 80% after 1000 hours of thermal aging at 150°C. They possess both good initial mechanical properties and toughness, fully meeting the requirements of connectors for new energy vehicles.

[0065] Comparative Example 1, using a traditional one-time feeding process, resulted in partial decomposition of the heat-sensitive flame retardant (reduced flame retardant efficiency, reaching only V-1 level) and interference with the color powder (color difference ΔE increased to 4.2). Furthermore, the glass fiber caused more severe shear degradation of the polymer, leading to a significant decrease in performance retention after thermal aging. Comparative Example 2, without added flame retardant, lacked flame retardancy. Although it exhibited a relatively high performance retention rate after thermal aging, it completely failed to meet application requirements, demonstrating the necessity of flame retardants in this invention.

[0066] In summary, this invention, through its unique formula design and step-by-step side-feeding preparation process, synergistically solves the technical challenge of simultaneously achieving color stability, high flame retardancy, long-term heat aging resistance, and mechanical properties.

[0067] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An orange nylon material for wiring harness connectors in new energy vehicles, characterized in that, It is prepared from the following components in parts by weight: 40 to 60 parts of nylon resin; 25 to 35 parts glass fiber; 15 to 25 parts of halogen-free flame retardant; Antioxidant 0.6 to 1.5 parts; Nucleating agent: 0.2 parts to 1 part; 0.5 to 1 part of silane coupling agent; Lubricant: 0.3 to 2 parts; Heat stabilizer: 0.3 parts to 1 part; 0.5 to 2 parts of color powder.

2. The orange nylon material for wiring harness connectors in new energy vehicles according to claim 1, characterized in that, The nylon resin is one or more of PA66, PA6, PA6I, PA66 / PA6I blend resin or PA1010; The halogen-free flame retardant is one or more of the following: aluminum diethylphosphite, melamine polyphosphate, melamine cyanurate, zinc borate, aluminum hydroxide, or aluminum oxide. The heat stabilizer is a copper salt stabilizer, which is one or more of HK-306, SR-336, H3336 or SH3360; The antioxidant comprises a primary antioxidant and a secondary antioxidant. The primary antioxidant is one or more of antioxidant 1098, antioxidant 3114, or antioxidant Deox 1790; the secondary antioxidant is one or more of antioxidant 168, antioxidant S-9228, or antioxidant Revonox 608. The lubricant is one or more of pentaerythritol stearate, ethylene bis-stearamide, or silicone powder; The silane coupling agent is one or more of KH-550, KH-560 or KH-570; The nucleating agent is one or more of the following: talc, silica, carboxylates, phosphates, sorbitol, or nanopolymer nucleating agents; The color powder is a highly heat-resistant organic or inorganic orange pigment.

3. A method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 1 or 2, characterized in that, Includes the following steps: Step 1: Premix raw materials; Nylon resin, antioxidant, nucleating agent, silane coupling agent, lubricant, heat stabilizer and color powder are put into a high-speed heating mixer for premixing to obtain the main feed premix. Step 2: Main feed metering and conveying; The main feed premix obtained in Step 1 is conveyed to the main feed hopper (3) via a vacuum feeder and continuously conveyed at a stable rate through the loss-in-weight metering feeder set below it. Step 3: Main material melting and plasticizing; The metered main feed premix is ​​added from the main feed port (2) of the twin-screw extruder conveyed in the same direction, and begins to melt and initially mix under the action of the melting and plasticizing module at the front of the extruder; Step 4: Precise lateral feeding of flame retardant; The halogen-free flame retardant is precisely injected into the partially molten polymer matrix through the first lateral weight loss metering feeder at the first side feed port (4) located in the middle and rear of the extruder barrel; Step 5: Lateral introduction and impregnation of glass fiber; glass fiber is introduced into the melt through the second lateral weight loss metering feeder at the second lateral feed port (4) located downstream of the first lateral feed port (4), and is cut, dispersed and impregnated through the high shear melt impregnation module; Step Six: Final Homogenization and Deviation of Melt: The melt containing all components is efficiently homogenized in the rear section of the extruder via a kneading block assembly element, and volatile components are removed by a vacuum devolatilization system; Step 7: Extrusion Cooling and Pelletizing: The homogeneous melt that has undergone sufficient devolatilization is extruded through the multi-hole die head template of a twin-screw extruder that is conveyed in the same direction. After being cooled and solidified in a cooling water tank, it is pelletized by a high-speed pelletizer to obtain orange nylon material.

4. The method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 3, characterized in that, The main motor speed of the twin-screw extruder is controlled at 300-500 r / min, and the main feed speed is controlled at 10-20 r / min. The twin-screw extruder is equipped with 12 independent temperature control modules from the feed port to the die head, with the temperature control range as follows: Zone 1 230-250℃, Zones 2 to 11 265-285℃, and Zone 12 270-290℃.

5. The method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 4, characterized in that, The twin-screw extruder includes a body (1) and a screen (11). A main feed port (2) is fixedly connected to the top of the body (1), and a main feed hopper (3) is fixedly connected to the top of the main feed port (2). Two natural vents (5) are provided at one end of the main feed port (2) at the top of the body (1). Two side feed ports (4) are fixedly connected to one side of the body (1). A vacuum vent (6) is fixedly connected to the top of the front end of the body (1), and a vacuum tank (7) is fixedly connected to the top of the vacuum vent (6). A vacuum tube (10) is fixedly connected to the outer wall of one side of the vacuum tank (7). The screen (11) is positioned above the vacuum vent (6). The screen (11) is replaced by a replacement mechanism (8), which includes... There is a replacement chamber (801), which is fixedly connected to the outer wall of the vacuum tank (7). A first motor (802) is installed at the bottom of the replacement chamber (801). A rotating rod (803) is connected to the output end of the first motor (802). The rotating rod (803) is rotatably connected to the inner wall of the vacuum tank (7) and the replacement chamber (801). Rotating seats (804) are symmetrically fixedly connected to both ends of the rotating rod (803). An installation groove (805) is provided at the top of the rotating seat (804). The screen (11) is slidably connected to the inner wall of the installation groove (805). An installation frame (806) is slidably connected to the top of the screen (11) on the inner wall of the installation groove (805). A positioning groove (807) is provided on the outer wall of the installation frame (806).

6. The method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 5, characterized in that, The replacement mechanism (8) further includes a positioning block (808), which is slidably connected to the interior of the rotating seat (804) and extends into the inner cavity of the mounting groove (805). A first spring (809) is connected between the positioning block (808) and the rotating seat (804). A first semi-circular surface (810) is provided at one end of the positioning block (808) located in the inner cavity of the mounting groove (805). A spur gear (811) is rotatably connected to the bottom end of the positioning block (808) inside the rotating seat (804). A slider (812) is slidably connected to the bottom end of the spur gear (811) inside the rotating seat (804). The slider (812) extends out of the rotating seat (804). A fixing plate (813) is fixedly connected to the inner wall of the replacement chamber (801). A second motor (814) is installed at the top of the vacuum tank (7). A threaded rod (815) is connected to the output end of the second motor (814). A partition (816) extending to the inner wall of the replacement chamber (801) is slidably connected inside the vacuum tank (7). The threaded rod (815) extends into the interior of the partition (816). A groove (819) is provided at the bottom end of the partition (816). A sealing element (817) is provided on the outer wall of the partition (816) and the inner wall of the groove (819). A replacement port (818) is provided at the top of the replacement chamber (801). The replacement port (818) is opened and closed by a switching mechanism (9).

7. The method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 6, characterized in that, The switching mechanism (9) includes a connecting block (902), which is threaded to the inner wall of the replacement port (818). A cover plate (901) is fixedly connected to the top of the connecting block (902). An annular groove (903) is formed on the outer wall of the connecting block (902). A displacement plate (904) is fixedly connected to one side of the outer wall of the partition plate (816). A displacement groove (905) is formed inside the vacuum tank (7) on the outer wall of the displacement plate (904). A lower pressure plate (908) extending into the inner cavity of the displacement groove (905) is slidably connected inside the vacuum tank (7). An insert extending into the inner cavity of the replacement port (818) is slidably connected inside the vacuum tank (7). A rod (906) is connected to the insertion rod (906) and the replacement chamber (801) by a second spring (907). A push rod (909) is fixedly connected to the outer wall of the lower pressure plate (908). A groove (910) is opened on the outer wall of the insertion rod (906). The push rod (909) contacts the groove (910). A first sealing ring (911) is fixedly connected to the bottom end of the cover plate (901) outside the connecting block (902). A vent (912) is opened at the top end of the cover plate (901). A sealing cap (913) is threadedly connected to the outer wall of the vent (912). A second sealing ring (914) is fixedly connected to the top end of the inner wall of the sealing cap (913).

8. The method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 7, characterized in that, The slider (812) extends from one end of the rotating seat (804) and is provided with a second semi-circular surface. The outer walls of the positioning block (808) and the slider (812) are provided with toothed grooves, which mesh with the spur gear (811). The outer wall of the mounting bracket (806) is in contact with the inner wall of the mounting groove (805). The top of the partition plate (816) is provided with a threaded hole, which matches the threaded rod (815). The inner wall of the groove (819) is in contact with the outer wall of the rotating rod (803).

9. The method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 7, characterized in that, The inner walls of the sealing cap (913) and the replacement port (818) are provided with internal threads, and the outer walls of the vent (912) and the connecting block (902) are provided with external threads, which are matched with the internal threads.

10. A method for preparing orange nylon material for wiring harness connectors in new energy vehicles according to claim 8, characterized in that, The outer wall of the displacement plate (904) is in contact with the inner wall of the displacement groove (905), and the outer wall of the insertion rod (906) is provided with a through groove for the lower pressure plate (908) to slide. One end of the outer wall of the insertion rod (906) is in contact with the inner wall of the annular groove (903).

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