Preparation method of orange-segment-shaped conductive polyamide filament

Abstract

The invention relates to the technical field of chinlon filaments, in particular to a preparation method of orange-segment-shaped conductive chinlon filaments, which comprises the following steps: step 1, taking chinlon slices as a component A of a melt spinning main material, taking graphene as a component B of a conductive material, compressing and melting the component A through a twin-screw extruder A to obtain a spinning melt A, compressing and melting the component B through a twin-screw extruder B to obtain a spinning melt B; and 2, filters are installed at outlets of booster pumps of the double-screw extruder A and the double-screw extruder B correspondingly, impurities in the spinning melt A and the spinning melt B are removed, and the stable spinning process is guaranteed. According to the invention, chinlon slices and a graphene conductive material are compounded in a spinning assembly, so that the orange-segment-shaped conductive chinlon filament with low cost and efficient antistatic property is constructed.

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 produce 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 after oscillating heating, washing and drying. However, the coating or impregnation methods used in the above patents all show weak bonding, and the graphene effective material is very easy to fall off, which leads to a shortened 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, 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 implemented by 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 of the main material for melt spinning and graphene as component B of the conductive material, compressing and melting component A through a twin-screw extruder A to obtain a spinning melt A, and compressing and melting component B 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 the twin-screw extruder A and the twin-screw extruder B, respectively, to remove impurities in the spinning melt A and the spinning melt B, so as to ensure a stable spinning process;

[0008] Step 3: By setting a distribution pipeline, the spinning melt A and the spinning melt B are simultaneously transported to the spinning box, 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 primary fibers;

[0011] Step 6: The primary fibers are pre-networked, stretched and heat-set, and then networked, and finally wound 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 one to five are 245-255°C, 255-260°C, 255-260°C, 255-265°C, and 255-265°C, respectively, the head temperature is 258-265°C, and the head 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 one to five are 245-250°C, 250-260°C, 250-260°C, 255-260°C, and 255-260°C, respectively, the head temperature is 258-263°C, and the head pressure is 80-100 Pa.

[0014] Preferably, in step 3, the flow rate of 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 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 side of the distribution plate has three first annular grooves, and between two adjacent first annular grooves there is a second annular groove, the first annular groove has a plurality of first circular holes, and the second annular groove has a plurality of circular grooves;

[0017] The back surface of the distribution plate is provided with an annular mounting groove, the annular mounting groove is provided with a circular convex portion corresponding to the position of the circular groove, the circular convex portion is provided with a plurality of second circular holes connected with the circular groove in an annular manner, 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 bunching 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 guide rollers in the stretching heat setting, the speed of the first guide roller is 3000-4000 m / min, the speed of the second guide roller is 3585-4900 m / min, and the speed of the third guide roller is 3550-4850 m / min; the heating temperature of the second guide 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] The present invention composites nylon slices with graphene conductive materials in a spinning assembly to construct low-cost and highly effective antistatic orange-segment-shaped conductive nylon filaments, whose surface positive (negative) charges offset the negative (positive) charges in the air, thereby achieving the effect of eliminating static electricity. In addition, based on the melt spinning method, conventional circular cross-section nylon fibers are modified to obtain uniform and stable orange-segment-shaped cross-sections, effectively exerting the synergistic multiple effects of nylon's softness, easy moisture absorption, and wear resistance and graphene's conductive properties, thereby achieving scalable, functional, and high-value-added nylon filaments. 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 schematic diagram of the structure of the 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 in conjunction with 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 of the main material for melt spinning and graphene as component B of the conductive material, compressing and melting component A through a twin-screw extruder A to obtain a spinning melt A, and compressing and melting component B 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 the twin-screw extruder A and the twin-screw extruder B, respectively, to remove impurities in the spinning melt A and the spinning melt B, so as to ensure a stable spinning process;

[0033] Step 3: By setting a distribution pipeline, the spinning melt A and the spinning melt B are simultaneously transported to the spinning box, 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 primary fibers;

[0036] Step 6: The primary fibers are pre-networked, stretched and heat-set, and then networked, and finally wound 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; 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 side of the distribution plate 1 has three first annular grooves 2, and between two adjacent first annular grooves 2 there are second annular grooves 3, the first annular grooves 2 have a plurality of first circular holes 21, and the second annular grooves have a plurality of circular grooves 31;

[0042] The back surface of the distribution plate is provided with an annular mounting groove 4, wherein the annular mounting groove 4 has a circular convex portion 5 corresponding to the position of the circular groove 31, and the circular convex portion 5 is provided with a plurality of second circular holes 51 connected to the circular groove 31 in an annular manner, and a forming groove 52 extending from the center of the circle 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, or 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; and then they are compounded together and extruded to form a thin melt stream with an orange segment shape. The distribution plate 1 can facilitate the subsequent formation of the orange segment-shaped melt stream, thereby facilitating the formation of orange segment-shaped 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 clustering 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.

[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 guide rollers in the stretching heat setting, the speed of the first guide roller is 3000-4000 m / min, the speed of the second guide roller is 3585-4900 m / min, and the speed of the third guide roller is 3550-4850 m / min; the heating temperature of the second guide 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.

[0047] Embodiment 1:

[0048] (1) 70% by mass of dried semi-dry (SD) nylon chips (named A) are transported to a silo through a nitrogen pipeline, and 30% by mass of dried graphene conductive materials (named B) are added to a precisely proportioned masterbatch silo;

[0049] (2) Material A was compressed and melted by a 4E twin-screw extruder, and 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, and 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;

[0050] (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;

[0051] (4) Melt A and melt B respectively pass through the guide plate, metal sand, and distribution plate in the spinning assembly at the same time, and then are compounded together to the spinneret and extruded to form a melt stream. 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;

[0052] (5) Cooling to a uniform filament bundle at a cooling air temperature of 19°C and a wind speed of 0.49 m / s. Further bundling and oiling, the vertical distance between the oil bundling point and the spinneret is 800 mm, and the vertical distance between the oil bundling 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 primary fiber;

[0053] (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 heat setting was 155 °C, the main network air pressure was 3.65 bar, the winding speed was 3700 m / min, the initial value of the winding angle was 5.0, and the winding angles along 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 of Figure 1 shown.

[0054] Embodiment 2:

[0055] (1) 75% by mass of the dried FD nylon chips (named A) are transported to a silo through a nitrogen pipeline, and 25% by mass of the dried graphene conductive material (named B) are added to a precisely proportioned masterbatch silo;

[0056] (2) Material A was compressed and melted by a 4E twin-screw extruder, with the temperatures of zones 1 to 5 being 248°C, 250°C, 255°C, 256°C, and 256°C, respectively, the die head temperature being 258°C, and the die head pressure being 90 Pa. Material B was compressed and melted by a 6E twin-screw extruder, with the temperatures of zones 1 to 5 being 250°C, 252°C, 258°C, 260°C, and 260°C, respectively, the die head temperature being 260°C, and the die head pressure being 90 Pa;

[0057] (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;

[0058] (4) Melt A and melt B respectively pass through the guide plate, metal sand, and distribution plate in the spinning assembly at the same time, and then are compounded together to 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.

[0059] (5) Cooling to a uniform strand of filaments at a cooling air temperature of 20°C and a wind speed of 0.50 m / s. Further bundling and oiling, the vertical distance between the oiling bundling point and the spinneret is 900 mm, and the vertical distance between the oiling bundling point and the wind window is 200 mm. The oil concentration is 7%, the oil pump specification is 1.2 mL / r, and the oil pump frequency is 48 Hz, to obtain nascent fibers;

[0060] (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 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 angle was 5.0, and the winding 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.

[0061] The above description is only a preferred embodiment of the present invention and should not be construed 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 filaments, characterized in that: The following steps are involved: Step 1: Using nylon chips as component A of the main material for melt spinning and graphene as component B of the conductive material, compressing and melting component A through a twin-screw extruder A to obtain a spinning melt A, and compressing and melting component B through a twin-screw extruder B to obtain a spinning melt B; Step 2: Install filters at the outlets of the booster pumps of the twin-screw extruder A and the twin-screw extruder B, respectively, to remove impurities in the spinning melt A and the spinning melt B, so as to ensure a stable spinning process; Step 3: By setting a distribution pipeline, the spinning melt A and the spinning melt B are simultaneously transported to the spinning box, 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 primary fibers; Step 6: The primary fibers are pre-networked, stretched and heat-set, and then networked, and finally wound by a winder.

2. The method for preparing a segmented-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. A 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; 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 segmented-shaped conductive nylon filament according to claim 1, characterized in that: 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 segmented-orange-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 segmented-orange-shaped conductive nylon filament according to claim 1 or 5, characterized in that: The front side of the distribution plate has three first annular grooves, and between two adjacent first annular grooves there is a second annular groove, the first annular groove has a plurality of first circular holes, and the second annular groove has a plurality of circular grooves; The back surface of the distribution plate is provided with an annular mounting groove, the annular mounting groove is provided with a circular convex portion corresponding to the position of the circular groove, the circular convex portion is provided with a plurality of second circular holes connected with the circular groove in an annular manner, 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.

7. The method for preparing a segmented-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 clustering 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.

8. The method for preparing a segmented-orange-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 guide rollers in the stretching heat setting, the speed of the first guide roller is 3000-4000 m / min, the speed of the second guide roller is 3585-4900 m / min, and the speed of the third guide roller is 3550-4850 m / min; the heating temperature of the second guide 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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