A preparation method of orange-segment-shaped conductive nylon filament

Abstract

The present invention relates to the technical field of nylon filaments, and in particular to a method for preparing segmented-segment-shaped conductive nylon filaments, comprising the following steps: Step 1: Using nylon chips as component A, the main material for melt spinning, and graphene as component B, the conductive material; compressing and melting component A through a twin-screw extruder A to obtain spinning melt A; and compressing and melting component B through a twin-screw extruder B to obtain spinning melt B; Step 2: Installing filters at the outlets of the booster pumps of twin-screw extruders A and B, respectively, to remove impurities from spinning melts A and B to ensure a stable spinning process. The present invention combines nylon chips with the graphene conductive material in a spinning assembly to produce segmented-segment-shaped conductive nylon filaments with low cost and high antistatic properties.

Description

Technical Field

[0001] The invention relates to the technical field of nylon filaments, in particular to a method for preparing segmented-orange-shaped conductive nylon filaments. Background Art

[0002] Nylon has attracted much attention in many fields due to its advantages such as high strength, excellent wear resistance, good elasticity and light weight. However, with the continuous advancement of science and technology and changes in market demand, the nylon industry should quickly adapt and promote high-quality development. Graphene with conductive properties is compounded into fiber fabrics to form a certain degree of conductivity, which can generate corona discharge or quickly leak the generated static charge, thereby reducing the static charge on the surface of the textile and improving its comfort and service life. Patent No. CN106400470A discloses a method for preparing nano-graphite composite polyester conductive fabric. The application puts polyester fabric into a nano-graphite dispersion, and obtains a conductive fabric with a simple technical process through oscillation heating, washing and drying. However, the coating or impregnation methods used in the above patents all show weak bonding force, and the graphene effective material is very easy to fall off, which in turn shortens the service life. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for preparing pie-shaped conductive nylon filaments, which comprises compounding nylon slices with graphene conductive materials in a spinning assembly to construct low-cost and highly effective antistatic pie-shaped conductive nylon filaments.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] A method for preparing pie-shaped conductive nylon filaments comprises the following steps:

[0006] Step 1: Using nylon chips as component A, the main material for melt spinning, and graphene as component B, the conductive material, the component A is compressed and melted through a twin-screw extruder A to obtain a spinning melt A, and the component B is compressed and melted through a twin-screw extruder B to obtain a spinning melt B;

[0007] Step 2: Install filters at the outlets of the booster pumps of twin-screw extruders A and B, respectively, to remove impurities from the spinning melts A and B to ensure a stable spinning process;

[0008] Step 3: By setting up a distribution pipe, the spinning melt A and the spinning melt B are simultaneously delivered to the spinning manifold, and then two metering pumps of different specifications are used to accurately adjust the flow of the spinning melt A and the spinning melt B respectively;

[0009] Step 4: Spinning melt A and spinning melt B pass through the guide plate, metal sand, and distribution plate in the spinning assembly, and then are compounded together to the spinneret and extruded to form a thin melt flow with an orange segment shape;

[0010] Step 5: The melt stream extruded from the spinning assembly is cooled and solidified by side blowing, and then bundled and oiled to form nascent fibers;

[0011] Step 6: The nascent fibers undergo pre-network bonding, stretching and heat setting, primary network bonding, and are finally wound into shape by a winder.

[0012] Preferably, in step 1, the mass percentage of the nylon slices and the graphene is 70%:30% to 90%:10%, wherein the nylon slices are one of matte, semi-gloss and glossy.

[0013] Preferably, step 1 is further specified as follows: compressing and melting component A through a twin-screw extruder A to obtain a spinning melt A, wherein the temperatures of zones 1 to 5 are 245-255°C, 255-260°C, 255-260°C, 255-265°C, and 255-265°C, respectively, the die temperature is 258-265°C, and the die pressure is 80-100 Pa; compressing and melting component B through a twin-screw extruder B to obtain a spinning melt B, wherein the temperatures of zones 1 to 5 are 245-250°C, 250-260°C, 250-260°C, 255-260°C, and 255-260°C, respectively, the die temperature is 258-263°C, and the die pressure is 80-100 Pa.

[0014] Preferably, in step 3, the flow rate of the spinning melt A is accurately adjusted by a metering pump A with a specification of 0.45 to 1.80 mL / r and a frequency of 40 to 65 Hz; the flow rate of the spinning melt B is accurately adjusted by a metering pump B with a specification of 0.45 to 1.20 mL / r and a frequency of 20 to 50 Hz.

[0015] Preferably, in step 4, the aspect ratio of the micropores in the spinneret is 1.5 to 3, the specification of the metal sand filter material is 35 / 45 mesh to 80 / 120 mesh, and the pressure of the spinning assembly is 110 to 200 Pa.

[0016] Preferably, the front surface of the distribution plate has three first annular grooves, and a second annular groove is provided between two adjacent first annular grooves. The first annular grooves have a plurality of first circular holes, and the second annular grooves have a plurality of circular grooves.

[0017] The back surface of the distribution plate is provided with an annular mounting groove, wherein the annular mounting groove has a circular protrusion corresponding to the position of the circular groove, and the circular protrusion is provided with a plurality of second circular holes in an annular shape connected to the circular groove, and a forming groove extending from the center of the circle to the circumference is provided between two adjacent second circular holes;

[0018] The spinning melt A is extruded from the second circular hole, and the spinning melt B is extruded from the first circular hole, or the spinning melt A is extruded from the first circular hole, and the spinning melt B is extruded from the second circular hole; then they are compounded together and extruded into a thin melt flow with an orange segment shape after being extruded on a spinneret.

[0019] Preferably, in step 5, the cooling air temperature of the side-blown air is 19-23° C., the wind speed is 0.45-0.55 m / s, the vertical distance between the bundle oiling point and the spinneret in the spinning assembly is 800-1200 mm, and the vertical distance from the wind window is 170-200 mm.

[0020] Preferably, in step 6, the pre-network air pressure is 1.1-1.5 bar, and the main network air pressure is 3.4-3.8 bar; there are three godet rollers in the stretching heat setting, the speed of the first godet roller is 3000-4000 m / min, the speed of the second godet roller is 3585-4900 m / min, and the speed of the third godet roller is 3550-4850 m / min; the heating temperature of the second godet roller is 150°C-170°C; the winding speed of the winder is 3500-4800 m / min, and the winding forming angle is 5.0-7.5.

[0021] Beneficial effects of the present invention:

[0022] This invention combines nylon chips with graphene conductive material in a spinning assembly to create low-cost, highly effective, antistatic, pie-shaped conductive nylon filaments. The positive (negative) surface charge of these fibers cancels out negative (positive) charges in the air, effectively eliminating static electricity. Furthermore, using a melt-spinning method, conventional circular nylon fibers are modified to achieve a uniform and stable pie-shaped cross-section. This effectively leverages the synergistic effects of nylon's softness, moisture absorption, and wear resistance with graphene's conductive properties, resulting in a scalable, functional, and high-value-added nylon filament. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the fiber in Example 1.

[0024] Figure 2 This is a cross-sectional view of the fiber in Example 2.

[0025] Figure 3 It is a schematic diagram of the front structure of the distribution plate.

[0026] Figure 4 It is a schematic diagram of the back structure of the distribution plate.

[0027] Figure 5 It is a structural diagram of a circular convex part.

[0028] In the figure: distribution plate 1, first annular groove 2, second annular groove 3, first circular hole 21, circular groove 31, annular mounting groove 4, circular protrusion 5, second circular hole 51, forming groove 52. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] A method for preparing pie-shaped conductive nylon filaments comprises the following steps:

[0031] Step 1: Using nylon chips as component A, the main material for melt spinning, and graphene as component B, the conductive material, the component A is compressed and melted through a twin-screw extruder A to obtain a spinning melt A, and the component B is compressed and melted through a twin-screw extruder B to obtain a spinning melt B;

[0032] Step 2: Install filters at the outlets of the booster pumps of twin-screw extruders A and B, respectively, to remove impurities from the spinning melts A and B to ensure a stable spinning process;

[0033] Step 3: By setting up a distribution pipe, the spinning melt A and the spinning melt B are simultaneously delivered to the spinning manifold, and then two metering pumps of different specifications are used to accurately adjust the flow of the spinning melt A and the spinning melt B respectively;

[0034] Step 4: Spinning melt A and spinning melt B pass through the guide plate, metal sand, and distribution plate in the spinning assembly, and then are compounded together to the spinneret and extruded to form a thin melt flow with an orange segment shape;

[0035] Step 5: The melt stream extruded from the spinning assembly is cooled and solidified by side blowing, and then bundled and oiled to form nascent fibers;

[0036] Step 6: The nascent fibers undergo pre-network bonding, stretching and heat setting, primary network bonding, and are finally wound into shape by a winder.

[0037] In step 1, the mass percentage of the nylon slices and the graphene is 70%:30% to 90%:10%, wherein the nylon slices are one of matte, semi-gloss, and glossy.

[0038] The step 1 is further specifically as follows: compressing and melting component A through a twin-screw extruder A to obtain a spinning melt A, wherein the temperatures of zones 1 to 5 are 245-255°C, 255-260°C, 255-260°C, 255-265°C, and 255-265°C, respectively; the die temperature is 258-265°C, and the die pressure is 80-100 Pa; and compressing and melting component B through a twin-screw extruder B to obtain a spinning melt B, wherein the temperatures of zones 1 to 5 are 245-250°C, 250-260°C, 250-260°C, 255-260°C, and 255-260°C, respectively; the die temperature is 258-263°C, and the die pressure is 80-100 Pa.

[0039] In the step 3, the flow rate of the spinning melt A is accurately adjusted by a metering pump A with a specification of 0.45 to 1.80 mL / r and a frequency of 40 to 65 Hz; the flow rate of the spinning melt B is accurately adjusted by a metering pump B with a specification of 0.45 to 1.20 mL / r and a frequency of 20 to 50 Hz.

[0040] In step 4, the aspect ratio of the micropores in the spinneret is 1.5 to 3, the specification of the metal sand filter material is 35 / 45 mesh to 80 / 120 mesh, and the pressure of the spinning assembly is 110 to 200 Pa.

[0041] like Figure 3-Figure 5 The front surface of the distribution plate 1 has three first annular grooves 2, and a second annular groove 3 is provided between two adjacent first annular grooves 2. The first annular groove 2 has a plurality of first circular holes 21, and the second annular groove has a plurality of circular grooves 31;

[0042] The back surface of the distribution plate has an annular mounting groove 4, and a circular protrusion 5 is provided in the annular mounting groove 4 corresponding to the position of the circular groove 31. The circular protrusion 5 is provided with a plurality of second circular holes 51 in an annular shape and connected to the circular groove 31. A forming groove 52 extending from the center to the circumference is provided between two adjacent second circular holes 51.

[0043] The spinning melt A is extruded from the second circular hole 51, and the spinning melt B is extruded from the first circular hole 21. Alternatively, the spinning melt A is extruded from the first circular hole 21, and the spinning melt B is extruded from the second circular hole 51. These melts are then combined and extruded into a spinneret to form a segmented melt stream. The distribution plate 1 facilitates the subsequent formation of segmented melt streams, thereby facilitating the formation of segmented conductive nylon filaments.

[0044] In this embodiment, the spinning melt A is extruded from the second circular hole 51, and the spinning melt B is extruded from the first circular hole 21. After the spinning melt B is extruded from the first circular hole 21, it will flow into the forming groove 52, and then be compounded together to the spinneret and extruded to form a thin melt flow with an orange segment shape.

[0045] In step 5, the cooling air temperature of the side-blown air is 19-23° C., the wind speed is 0.45-0.55 m / s, the vertical distance between the bundle oiling point and the spinneret in the spinning assembly is 800-1200 mm, and the vertical distance between the bundle oiling point and the wind window is 170-200 mm.

[0046] In step 6, the pre-network air pressure is 1.1-1.5 bar, and the main network air pressure is 3.4-3.8 bar; there are three godet rollers in the stretching heat setting, the speed of the first godet roller is 3000-4000 m / min, the speed of the second godet roller is 3585-4900 m / min, and the speed of the third godet roller is 3550-4850 m / min; the heating temperature of the second godet roller is 150°C-170°C; the winding speed of the winder is 3500-4800 m / min, and the winding forming angle is 5.0-7.5. Example 1

[0047] (1) 70% by mass of dried semi-dark (SD) nylon chips (named A) were transported to the silo through a nitrogen pipeline, and 30% by mass of dried graphene conductive material (named B) was added to the precisely proportioned masterbatch silo;

[0048] (2) Material A was compressed and melted by a 4E twin-screw extruder. The temperatures of zones 1 to 5 were 248°C, 258°C, 259°C, 262°C, and 262°C, respectively. The die head temperature was 262°C, and the die head pressure was 90 Pa. Material B was compressed and melted by a 6E twin-screw extruder. The temperatures of zones 1 to 5 were 250°C, 258°C, 259°C, 261°C, and 260°C, respectively. The die head temperature was 260°C, and the die head pressure was 90 Pa.

[0049] (3) After melt A and melt B pass through their respective filters and distribution pipes, melt A is regulated by a metering pump with a specification of 0.45 mL / r and a metering pump frequency of 48.86 Hz. Melt B is regulated by a metering pump with a specification of 1.2 mL / r and a metering pump frequency of 24.42 Hz.

[0050] (4) Melt A and melt B pass through the guide plate, metal sand, and distribution plate in the spinning assembly at the same time, and then are compounded together and extruded into a melt stream after being extruded into the spinneret. Component A uses a 35 / 45 mesh metal sand filter material, and component B uses a 45 / 60 mesh metal sand filter material. The aspect ratio of the micropores in the spinneret is 3. The assembly pressure of component A is 151.6 Pa, and the assembly pressure of component B is 132.5 Pa.

[0051] (5) Cooling to a uniformly dry filament bundle at a cooling air temperature of 19°C and a wind speed of 0.49 m / s. The bundle is further bundled and oiled. The vertical distance between the oiling bundle point and the spinneret is 800 mm, and the vertical distance between the oiling bundle point and the wind window is 195 mm. The oil concentration is 9%, the oil pump specification is 0.16 mL / r, and the oil pump frequency is 56 Hz to obtain the nascent fiber;

[0052] (6) The spun fibers were pre-networked, the pre-network air pressure was 1.30 bar, the speed of the first godet roller was 2800 m / min, the speed of the second godet roller was 3600 m / min, the speed of the third godet roller was 3750 m / min, the heating temperature of the second godet roller in the heat setting was 155 °C, the main network air pressure was 3.65 bar, the winding speed was 3700 m / min, the starting value of the winding forming angle was 5.0, and the winding forming angles with the winding motion were 5.2, 5.4, 5.6, 5.8, 6.0, 5.7, 5.4, and 5.2, respectively, to prepare 85D / 34F SD conductive nylon filaments, with a cross section shown in FIG. Figure 1 shown. Example 2

[0053] (1) The dried 75% mass percent matte (FD) nylon chips (named A) were transported to the silo through a nitrogen pipeline, and the dried 25% mass percent graphene conductive material (named B) was added to the precisely proportioned masterbatch silo;

[0054] (2) Material A was compressed and melted by a 4E twin-screw extruder. The temperatures of zones 1 to 5 were 248°C, 250°C, 255°C, 256°C, and 256°C, respectively. The die head temperature was 258°C, and the die head pressure was 90 Pa. Material B was compressed and melted by a 6E twin-screw extruder. The temperatures of zones 1 to 5 were 250°C, 252°C, 258°C, 260°C, and 260°C, respectively. The die head temperature was 260°C, and the die head pressure was 90 Pa.

[0055] (3) After melt A and melt B pass through their respective filters and distribution pipes, melt A is regulated by a metering pump with a specification of 1.2 mL / r and a metering pump frequency of 15 Hz. Melt B is regulated by a metering pump with a specification of 0.6 mL / r and a metering pump frequency of 30.12 Hz.

[0056] (4) Melt A and melt B pass through the guide plate, metal sand, and distribution plate in the spinning assembly at the same time, and then are compounded into the spinneret and extruded to form a melt stream. Component A uses a 60 / 80 mesh metal sand filter material, and component B uses a 45 / 60 mesh metal sand filter material. The aspect ratio of the micropores in the spinneret is 2.3. The assembly pressure of component A is 105 Pa, and the assembly pressure of component B is 128 Pa.

[0057] (5) Cool the fibers to a uniform strand at a cooling air temperature of 20°C and a wind speed of 0.50 m / s. The fibers are then bundled and oiled. The vertical distance between the oiling bundle point and the spinneret is 900 mm, and the vertical distance between the oiling bundle point and the wind window is 200 mm. Using an oil concentration of 7%, an oil pump specification of 1.2 mL / r, and an oil pump frequency of 48 Hz, nascent fibers are obtained.

[0058] (6) The spun fibers were pre-networked, the pre-network air pressure was 1.30 bar, the speed of the first godet roller was 3380 m / min, the speed of the second godet roller was 4522 m / min, the speed of the third godet roller was 4502 m / min, the heating temperature of the second godet roller in the heat setting was 160 °C, the main network air pressure was 3.65 bar, the winding speed was 4500 m / min, the starting value of the winding forming angle was 5.0, and the winding forming angles along with the winding motion were 5.4, 5.7, 6.0, 6.2, 6.4, 6.2, 5.9, 5.5, and 5.0, respectively, to prepare 85D / 24F FD conductive nylon filaments with a cross section as shown in FIG. Figure 2 shown.

[0059] The above description is only a preferred embodiment of the present invention and should not be understood as limiting the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for preparing pie-shaped conductive nylon filament, characterized in that: The following steps are involved: Step 1: Using nylon chips as component A, the main material for melt spinning, and graphene as component B, the conductive material, the component A is compressed and melted through a twin-screw extruder A to obtain a spinning melt A, and the component B is compressed and melted through a twin-screw extruder B to obtain a spinning melt B; Step 2: Install filters at the outlets of the booster pumps of twin-screw extruders A and B, respectively, to remove impurities from the spinning melts A and B to ensure a stable spinning process; Step 3: By setting up a distribution pipe, the spinning melt A and the spinning melt B are simultaneously delivered to the spinning manifold, and then two metering pumps of different specifications are used to accurately adjust the flow of the spinning melt A and the spinning melt B respectively; Step 4: Spinning melt A and spinning melt B pass through the guide plate, metal sand, and distribution plate in the spinning assembly, and then are compounded together to the spinneret and extruded to form a thin melt flow with an orange segment shape; Step 5: The melt stream extruded from the spinning assembly is cooled and solidified by side blowing, and then bundled and oiled to form nascent fibers; Step 6: The spun fibers are pre-coated, stretched and heat-set, and then subjected to primary cohesion before being wound up by a winder. The front surface of the distribution plate has three first annular grooves, and a second annular groove is provided between two adjacent first annular grooves. The first annular grooves have a plurality of first circular holes, and the second annular grooves have a plurality of circular grooves. The back surface of the distribution plate is provided with an annular mounting groove, wherein the annular mounting groove has a circular protrusion corresponding to the position of the circular groove, and the circular protrusion is provided with a plurality of second circular holes in an annular shape connected to the circular groove, and a forming groove extending from the center of the circle to the circumference is provided between two adjacent second circular holes; The spinning melt A is extruded from the second circular hole, and the spinning melt B is extruded from the forming groove, or the spinning melt A is extruded from the forming groove, and the spinning melt B is extruded from the second circular hole; The two materials are then compounded together and extruded onto a spinneret to form a thin melt stream having an orange segment shape.

2. The method for preparing a pie-shaped conductive nylon filament according to claim 1, characterized in that: In step 1, the mass percentage of the nylon slices and the graphene is 70%:30% to 90%:10%, wherein the nylon slices are one of matte, semi-gloss, and glossy.

3. The method for preparing a pie-shaped conductive nylon filament according to claim 1 or 2, characterized in that: The step 1 is further specifically as follows: compressing and melting component A through a twin-screw extruder A to obtain a spinning melt A, wherein the temperatures of zones 1 to 5 are 245-255°C, 255-260°C, 255-260°C, 255-265°C, and 255-265°C, respectively; the die temperature is 258-265°C, and the die pressure is 80-100 Pa; and compressing and melting component B through a twin-screw extruder B to obtain a spinning melt B, wherein the temperatures of zones 1 to 5 are 245-250°C, 250-260°C, 250-260°C, 255-260°C, and 255-260°C, respectively; the die temperature is 258-263°C, and the die pressure is 80-100 Pa.

4. The method for preparing a pie-shaped conductive nylon filament according to claim 1, wherein: In the step 3, the flow rate of the spinning melt A is accurately adjusted by a metering pump A with a specification of 0.45 to 1.80 mL / r and a frequency of 40 to 65 Hz; the flow rate of the spinning melt B is accurately adjusted by a metering pump B with a specification of 0.45 to 1.20 mL / r and a frequency of 20 to 50 Hz.

5. The method for preparing a pie-shaped conductive nylon filament according to claim 1, characterized in that: In step 4, the aspect ratio of the micropores in the spinneret is 1.5 to 3, the specification of the metal sand filter material is 35 / 45 mesh to 80 / 120 mesh, and the pressure of the spinning assembly is 110 to 200 Pa.

6. The method for preparing a pie-shaped conductive nylon filament according to claim 1, characterized in that: In step 5, the cooling air temperature of the side-blown air is 19-23° C., the wind speed is 0.45-0.55 m / s, the vertical distance between the bundle oiling point and the spinneret in the spinning assembly is 800-1200 mm, and the vertical distance between the bundle oiling point and the wind window is 170-200 mm.

7. The method for preparing a pie-shaped conductive nylon filament according to claim 1, characterized in that: In step 6, the pre-network air pressure is 1.1-1.5 bar, and the main network air pressure is 3.4-3.8 bar; there are three godet rollers in the stretching heat setting, the speed of the first godet roller is 3000-4000 m / min, the speed of the second godet roller is 3585-4900 m / min, and the speed of the third godet roller is 3550-4850 m / min; the heating temperature of the second godet roller is 150°C-170°C; the winding speed of the winder is 3500-4800 m / min, and the winding forming angle is 5.0-7.5.

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