Antibacterial superfine polyester low stretch yarn and preparation method thereof

Abstract

The invention discloses an antibacterial superfine polyester low stretch yarn, which is prepared from the following raw material components: polyethylene glycol terephthalate slices, an antibacterial modifier and a conductive filler, the use amount of the antibacterial modifier and the conductive filler is 5-20% of the mass of the polyethylene glycol terephthalate slice; the mass ratio of the antibacterial modifier to the conductive filler is (2-5): 1; the preparation method comprises the following steps: melt spinning; stretching and orienting; performing false twist deformation; and post-processing. On the basis of the formula design of adding the nano zinc oxide master batch and the graphene, through the design of a spinning process and a drawing process, the superfine polyester low stretch yarn is endowed with excellent antibacterial property and antistatic property, meets the taking requirements of high-end underwear fabrics, and further has good mechanical strength, low hairiness rate and excellent comprehensive performance.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester fiber preparation, and particularly to an antibacterial superfine polyester drawn textured yarn and a preparation method thereof. Background Art

[0002] Superfine polyester drawn textured yarn is a chemical fiber material with specific properties, having the high quality of superfine fibers, and being widely used for making next-to-skin clothing because of its characteristics such as smooth surface, delicate touch, moisture absorption and sweat discharge performance, and is highly favored by consumers.

[0003] However, during the wearing process of the next-to-skin clothing prepared from the existing superfine polyester drawn textured yarn, problems such as static electricity and bacterial growth still exist, and it cannot meet the functional requirements of people for textiles. Summary of the Invention

[0004] The present invention provides an antibacterial superfine polyester drawn textured yarn and a preparation method thereof, which can solve the problem of poor functionality of the existing superfine polyester drawn textured yarn in terms of antistatic property and antibacterial property.

[0005] To solve the above technical problems, the present invention provides an antibacterial superfine polyester drawn textured yarn, the raw materials of which include the following components: polyethylene terephthalate chips, antibacterial modifier and conductive filler; wherein, the usage amounts of the antibacterial modifier and the conductive filler are 5%-20% of the mass of the polyethylene terephthalate chips; the mass ratio of the antibacterial modifier to the conductive filler is 2-5:1;

[0006] The intrinsic viscosity of the polyethylene terephthalate chips is 0.6-0.7 dL / g.

[0007] In a preferred embodiment of the present invention, the antibacterial modifier is a nano-zinc oxide masterbatch.

[0008] In a preferred embodiment of the present invention, the conductive filler is graphene or carbon nanotubes.

[0009] To solve the above technical problems, the present invention also provides a preparation method of an antibacterial superfine polyester drawn textured yarn, including the following steps:

[0010] (1) Melt spinning: Weigh polyethylene terephthalate chips, antibacterial modifier and conductive filler according to the formula amounts and add them into a twin-screw extruder, melt and extrude, and the obtained melt is ejected through a spinneret plate, and after cooling, primary fibers with a single-fiber fineness less than or equal to 0.25 D are obtained;

[0011] (2) Drawing and orientation: The primary fibers are sequentially subjected to cold drawing, hot drawing and heat setting treatments;

[0012] The temperature of the cold drawing is 20-25 °C, and the drawing ratio is 1.5-1.8 times;

[0013] The temperature of the hot stretching is 85 - 120 °C, and the stretching multiple is 4.0 - 4.5 times.

[0014] (3) False twist texturing: The drawn and oriented fibers are subjected to false twist texturing treatment through a false twister.

[0015] (4) Post-treatment: The fibers after false twist texturing are successively subjected to high-pressure air networking and oiling treatment, and finally wound to obtain the antibacterial superfine polyester drawn texturing yarn.

[0016] In a preferred embodiment of the present invention, in step (1), the temperature of the melt extrusion is 260 - 280 °C.

[0017] In a preferred embodiment of the present invention, in step (1), the aperture of the spinneret plate is 0.10 - 0.13 mm.

[0018] In a preferred embodiment of the present invention, in step (2), the temperature of the heat setting is 165 - 175 °C.

[0019] In a preferred embodiment of the present invention, in step (3), the process conditions of the false twist texturing are: the processing speed is 500 - 700 m / min, the first hot box is 180 - 200 °C, and the second hot box is 170 - 180 °C.

[0020] In a preferred embodiment of the present invention, in step (4), the air pressure of the high-pressure air networking is 0.3 - 0.4 MPa.

[0021] In a preferred embodiment of the present invention, in step (4), the oiling rate is 0.8 - 1.0%.

[0022] The beneficial effects of the present invention are as follows: The preparation method of the antibacterial superfine polyester drawn texturing yarn of the present invention, on the basis of the formulation design of adding nano-zinc oxide masterbatch and graphene, endows the superfine polyester drawn texturing yarn with excellent antibacterial and antistatic properties, meets the wearing requirements of high-end underwear fabrics, and in addition, has good mechanical strength and a low hairiness rate, and has excellent comprehensive performance. Description of the Drawings

[0023] Figure 1 It is a process flow schematic diagram of the preparation method of the antibacterial superfine polyester drawn texturing yarn of the present invention. Detailed Description of the Invention

[0024] The following elaborates on the preferred embodiments of the present invention in conjunction with the drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] Example 1

[0026] A preparation method of antibacterial superfine polyester drawn texturing yarn, specifically comprising the following steps:

[0027] (1) Melt spinning: Weigh 1000 g of polyethylene terephthalate chips with an intrinsic viscosity of 0.65 dL / g, 100 g of nano-zinc oxide masterbatch (particle size 60 - 70 nm), and 20 g of graphene. After mixing evenly, add them into the feed hopper of a twin-screw extruder;

[0028] Pre-adjust the temperature of the twin-screw extruder. Specifically, the temperature of the first zone of the twin-screw extruder is 260 °C, the second zone is 265 °C, the third zone is 270 °C, the fourth zone is 275 °C, and the head temperature is 280 °C. Adjust the screw speed to 45 r / min to ensure the uniformity of the melt;

[0029] After the polyethylene terephthalate chips, nano-zinc oxide masterbatch, and graphene materials are melt-extruded by the twin-screw extruder, the obtained melt is ejected through a spinneret with a pore diameter of 0.12 mm, and side blowing cooling is carried out at a wind speed of 20 °C and 0.4 m / s to obtain a nascent fiber with a single-hole fineness less than or equal to 0.25 D;

[0030] (2) Drawing and orientation: First, cold draw the nascent fiber at 25 °C with a draw ratio of 1.6 to eliminate the internal stress of the fiber, and then hot draw it at 100 °C with a draw ratio of 4.0 to orient the molecular chains;

[0031] After the drawing is completed, place the superfine polyester fiber in a high-temperature oven at 170 °C for relaxation setting for 30 min to reduce the shrinkage rate;

[0032] Through the combined design of cold drawing and hot drawing, the strength of the superfine polyester fiber is effectively improved, and its fracture resistance is enhanced;

[0033] (3) False twist texturing: Subject the drawn and oriented fiber to false twist texturing treatment through a stacked disk false twister. The specific process conditions are as follows:

[0034] The false twist speed is 600 m / min to prevent the generation or increase of hairiness;

[0035] The first hot box is at 190 °C to endow the fiber with elasticity;

[0036] The second hot box is at 180 °C for setting to reduce the elastic recovery rate and obtain drawn texturing yarn;

[0037] (4) Post-treatment: The superfine polyester fiber after false twist texturing is subjected to high-pressure air networking at 0.3 MPa to reduce hairiness, and then oiling treatment is carried out using a commercially available composite spinning oil agent, controlling the oiling rate to be 0.9%, and finally winding to obtain the antibacterial superfine polyester drawn textured yarn.

[0038] Example 2

[0039] A preparation method of antibacterial superfine polyester drawn textured yarn specifically includes the following steps:

[0040] (1) Melt spinning: Weigh 1000 g of polyethylene terephthalate chips with an intrinsic viscosity of 0.65 dL / g, 80 g of nano-zinc oxide masterbatch, and 20 g of carbon nanotubes. After mixing evenly, add them to the feed hopper of a twin-screw extruder;

[0041] Pre-adjust the temperature of the twin-screw extruder. Specifically, the temperature of the first zone of the twin-screw extruder is 260 °C, the second zone is 265 °C, the third zone is 270 °C, the fourth zone is 275 °C, and the head temperature is 280 °C. Adjust the screw speed to 45 r / min to ensure the uniformity of the melt;

[0042] After the polyethylene terephthalate chips, nano-zinc oxide masterbatch, and graphene materials are melt-extruded by the twin-screw extruder, the obtained melt is ejected through a spinneret with a pore diameter of 0.12 mm, and side blowing cooling is carried out with a wind speed of 20 °C and 0.4 m / s to obtain a nascent fiber with a single-hole fineness less than or equal to 0.25 D;

[0043] (2) Drawing and orientation: The nascent fiber is first cold drawn at 25 °C with a draw ratio of 1.7 to eliminate the internal stress of the fiber, and then hot drawn at 100 °C with a draw ratio of 4.4 to orient the molecular chains;

[0044] After the drawing is completed, it is placed in a high-temperature oven at 170 °C for relaxation setting for 30 min to reduce the shrinkage rate;

[0045] (3) False twist texturing: The superfine polyester fiber after drawing and orientation is subjected to false twist texturing treatment through a stacked disc false twister. The specific process conditions are as follows:

[0046] The false twist speed is 700 m / min to prevent the generation or increase of hairiness;

[0047] The first hot box is at 185 °C to endow the fiber with elasticity;

[0048] The second hot box is at 170 °C for shaping and reducing the elastic recovery rate to obtain drawn textured yarn;

[0049] (4) Post-treatment: The false-twist textured fibers are subjected to high-pressure air networking at 0.3 MPa to reduce hairiness, and then oiling treatment is carried out using a commercially available composite spinning finish, controlling the oiling rate to be 0.9%, and finally winding to obtain the antibacterial superfine polyester drawn textured yarn.

[0050] Comparative Example 1

[0051] Weigh 1000 g of polyethylene terephthalate chips with an intrinsic viscosity of 0.65 dL / g and 20 g of graphene, mix them evenly and add them to the feed hopper of a twin-screw extruder for melt extrusion. The subsequent process steps and conditions are the same as those in Example 1.

[0052] Comparative Example 2

[0053] Weigh 1000 g of polyethylene terephthalate chips with an intrinsic viscosity of 0.65 dL / g and 100 g of nano-zinc oxide masterbatch, mix them evenly and add them to the feed hopper of a twin-screw extruder for melt extrusion. The subsequent process steps and conditions are the same as those in Example 1.

[0054] The superfine polyester drawn textured yarns prepared in Example 1, Example 2, Comparative Example 1 and Comparative Example 2 were respectively subjected to performance tests. The test results are shown in Table 1 below. Among them, the test standard for volume resistivity is ASTM D257; the test standard for antibacterial rate is ISO 20743.

[0055] Table 1

[0056]

[0057] As can be seen from the data in Table 1 above, the superfine polyester drawn textured yarn prepared by the present invention has good broad-spectrum antibacterial properties and excellent antistatic properties; in addition, through the design of the spinning process and the drawing process, the obtained superfine polyester drawn textured yarn also has a low hairiness rate and good mechanical strength, with excellent comprehensive performance, and is an ideal material for preparing high-end underwear fabrics.

[0058] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An antibacterial superfine polyester drawn textured yarn, characterized in that, Its raw materials include the following components: polyethylene terephthalate chips, antibacterial modifier, and conductive filler; wherein, the dosage of the antibacterial modifier and conductive filler is 5%-20% of the mass of the polyethylene terephthalate chips; the mass ratio of the antibacterial modifier to the conductive filler is 2-5:1; The intrinsic viscosity of the polyethylene terephthalate chips is 0.6-0.7 dL / g.

2. An antibacterial superfine polyester drawn textured yarn according to claim 1, characterized in that, The antibacterial modifier is a nano-zinc oxide masterbatch.

3. An antibacterial superfine polyester drawn textured yarn according to claim 1, characterized in that, The conductive filler is graphene or carbon nanotubes.

4. A method for preparing the antibacterial superfine polyester drawn textured yarn as described in claim 1, characterized in that, It includes the following steps: (1) Melt spinning: Weigh the polyethylene terephthalate chips, antibacterial modifier, and conductive filler according to the formula amount and add them into a twin-screw extruder for melt extrusion. The obtained melt is ejected through a spinneret, and after cooling, a primary fiber with a single-hole fineness less than or equal to 0.25 D is obtained; (2) Drawing and orientation: The primary fiber is subjected to cold drawing, hot drawing, and heat setting treatments in sequence; The temperature of the cold drawing is 20-25 °C, and the drawing ratio is 1.5-1.8 times; The temperature of the hot drawing is 85-120 °C, and the drawing ratio is 4.0-4.5 times; (3) False twist texturing: The drawn fiber is subjected to false twist texturing treatment through a false twister; (4) Post-treatment: The fiber after false twist texturing is subjected to high-pressure air networking and oiling treatments in sequence, and finally wound to obtain the antibacterial superfine polyester drawn textured yarn.

5. The preparation method according to claim 4, wherein In step (1), the temperature of the melt extrusion is 260-280 °C.

6. The preparation method according to claim 4, characterized in that, In step (1), the aperture of the spinneret is 0.10-0.13 mm.

7. The preparation method according to claim 4, characterized in that, In step (2), the temperature of the heat setting is 165-175 °C.

8. The preparation method according to claim 4, wherein In step (3), the process conditions of the false twist texturing are: processing speed 500-700 m / min, first hot box 180-200 °C, second hot box 170-180 °C.

9. The preparation method according to claim 4, characterized in that, In step (4), the air pressure of the high-pressure air networking is 0.3-0.4 MPa.

10. The preparation method according to claim 4, characterized in that, In step (4), the oiling rate is 0.8-1.0%.

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