High-strength wear-resistant polyester low stretch yarn and preparation method thereof

Abstract

The invention discloses a high-strength wear-resistant polyester drawn textured yarn and a preparation method thereof. The high-strength wear-resistant polyester drawn textured yarn is prepared from the following raw materials: polyester chips, a wear-resistant modifier and a toughening modifier, the dosage of the wear-resistant modifier is 1-10% of the mass of the polyester chip; the use amount of the toughening modifier is 5-10% of the mass of the polyester chip; the intrinsic viscosity of the polyester chip is greater than or equal to 0.9 dL / g; the preparation method comprises the steps of ingredient mixing; melt spinning; stretching treatment; and carrying out heat treatment, false twisting treatment and post-treatment. According to the preparation method of the high-strength wear-resistant polyester drawn textured yarn, on the basis of formula design, the strength and wear resistance of the polyester drawn textured yarn are effectively improved through the two-section type hot stretching design, the manufacturing requirement and the use requirement of leather preparation can be met, and practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of polyester filament preparation, and particularly to a high-strength and wear-resistant polyester drawn texturized yarn and a preparation method thereof. Background Art

[0002] In recent years, with the development of the economy, leather products have been increasingly favored by consumers. Leather products such as leather bags, leather clothes, leather shoes, leather fixtures, leather automotive interior parts, etc., due to their diverse structures and shapes, usually need to be sewn into the required shapes using sewing threads.

[0003] Due to the hard nature of the leather material itself, ordinary sewing threads are extremely prone to being worn and broken when sewing leather products, affecting the service life of leather preparation.

[0004] Chinese Patent CN 116334788A discloses a wear-resistant polyester drawn texturized yarn and a preparation method thereof. This technology is designed from the aspects of improving heat resistance, mechanical strength, and melt flow properties, so that the prepared polyester drawn texturized yarn has the characteristics of low breakage rate, few hairiness, high tensile strength, and both high strength and good wear resistance.

[0005] However, during the process of the inventors of the present application implementing the technical solution of the present invention, it is found that the polyester drawn texturized yarn prepared by the above technology still cannot meet the use requirements of leather products. Summary of the Invention

[0006] The present invention provides a high-strength and wear-resistant polyester drawn texturized yarn and a preparation method thereof to solve the problems of insufficient strength and wear resistance of the sewing threads used in existing leather products.

[0007] To solve the above technical problems, the present invention provides a high-strength and wear-resistant polyester drawn texturized yarn, the raw materials of which include the following components: polyester chips, wear-resistant modifier, and toughening modifier; wherein, the dosage of the wear-resistant modifier is 1% - 10% of the mass of the polyester chips; the dosage of the toughening modifier is 5% - 10% of the mass of the polyester chips;

[0008] The intrinsic viscosity of the polyester chips is greater than or equal to 0.9 dL / g.

[0009] In a preferred embodiment of the present invention, the wear-resistant modifier is a mixture of nano-silica and silicon carbide mixed in a mass ratio of 1:1 to 4:1.

[0010] In a preferred embodiment of the present invention, the toughening modifier is at least one of polyamide or polyphenylene sulfide.

[0011] To solve the above technical problems, the present invention also provides a preparation method of a high-strength and wear-resistant polyester drawn texturized yarn, including the following steps:

[0012] (1) Ingredient mixing: Weigh the polyester chips, wear-resistant modifier, and toughening modifier according to the formula amounts, dry and mix them to obtain a mixed material;

[0013] (2) Melt spinning: Melt and blend the above-mentioned mixed material with a twin-screw extruder. After the obtained melt is filtered to remove impurities, it is spun through a spinneret and cooled to obtain a nascent fiber;

[0014] (3) Drawing treatment: Perform pre-drawing on the obtained nascent fiber to preliminarily orient the molecular chains, and then perform a two-stage hot drawing treatment;

[0015] The temperature of the pre-drawing is 85 - 95 °C, and the drawing ratio is 1.5 - 2.0 times;

[0016] For the first stage of the two-stage hot drawing treatment, the temperature is 140 - 150 °C, and the drawing ratio is 3.5 - 4.0; for the second stage, the temperature is 105 - 120 °C, and the drawing ratio is 2.0 - 3.0;

[0017] (4) Heat treatment and false twist treatment: Perform heat treatment on the drawn polyester fiber, and then perform false twist treatment through a false twister;

[0018] (5) Post-treatment: Guide, oil, and wind the polyester fiber treated in step (4) into a coil to obtain the high-strength wear-resistant polyester draw textured yarn.

[0019] In a preferred embodiment of the present invention, in step (2), the screw speed of the twin-screw extruder is 35 - 45 r / min.

[0020] In a preferred embodiment of the present invention, in step (2), the spinneret has special-shaped holes, the aperture of the special-shaped holes is 0.2 - 0.25 mm, and the aspect ratio of the special-shaped holes is 4 - 5.

[0021] In a preferred embodiment of the present invention, in step (2), the cooling method is ring blowing cooling, the cooling temperature is 20 - 30 °C, and the humidity is 70 - 80%.

[0022] In a preferred embodiment of the present invention, in step (4), the heat treatment is a two-stage heat treatment. The temperature of the first-stage heat treatment is 180 - 200 °C, and the time is 10 - 20 s; the temperature of the second-stage heat treatment is 165 - 175 °C, and the time is 10 - 30 s.

[0023] In a preferred embodiment of the present invention, in step (4), the false twister is a friction false twister, and the D / Y ratio is 2.0 - 2.5.

[0024] In a preferred embodiment of the present invention, in step (5), the oiling rate is 1.0-1.3%.

[0025] The beneficial effects of the present invention are as follows: the preparation method of the high-strength and wear-resistant polyester low-elastic yarn of the present invention, based on the formula design, effectively improves the strength and wear resistance of the polyester low-elastic yarn through a two-stage hot stretching design, can meet the production requirements and use requirements of leather preparation, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process of a method for preparing high-strength and wear-resistant polyester low-elastic yarn of the present invention. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying 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.

[0028] See also Figure 1 , the embodiment of the present invention includes:

[0029] Example 1

[0030] A method for preparing high-strength wear-resistant polyester low-elastic yarn specifically comprises the following steps:

[0031] (1) Mixing ingredients: weigh 1000 g of polyester chips with an intrinsic viscosity of 0.95 dL / g, 30 g of a wear-resistant modifier, and 60 g of a toughening modifier, dry and mix them; wherein the wear-resistant modifier is a mixture of nano-silicon dioxide and silicon carbide in a mass ratio of 2:1; and the toughening modifier is polyamide.

[0032] (2) Melt spinning: adding the above-mentioned mixed material into the feed bin of a twin-screw extruder with the temperature and screw speed adjusted in advance for melt blending;

[0033] The temperature of the first zone of the twin-screw extruder is 260°C, the temperature of the second zone is 265°C, the temperature of the third zone is 270°C, the temperature of the fourth zone is 275°C, the head temperature is 280°C, and the screw speed is adjusted to 40r / min to ensure the uniformity of the melt;

[0034] The obtained melt is filtered to remove impurities, and then spun through a spinneret with three-leaf shaped holes and cooled to obtain primary fibers;

[0035] Specifically, the diameter of the three-leaf irregular holes is 0.2 mm, and the aspect ratio of the irregular holes is 4. The aspect ratio design of the spinneret hole is conducive to reducing melt fracture.

[0036] The cooling method is ring-blowing cooling, the cooling temperature is 25° C., and the humidity is 75%.

[0037] (3) Stretching treatment: The obtained primary fibers are pre-stretched to give the molecular chains a preliminary orientation, and then subjected to a two-stage heat stretching treatment.

[0038] Specifically, the pre-stretching temperature is 90° C. and the stretching ratio is 2.0 times, the purpose of which is to preliminarily orient the molecular chains and lay the foundation for the next step of thermal stretching.

[0039] The two-stage heat stretching treatment includes a first stage heat stretching and a second stage heat stretching. The temperature of the first stage heat stretching is 145°C, and the stretching ratio is 4.0, which is a rapid stretching, which is conducive to improving the orientation degree, thereby improving the fiber strength;

[0040] The second stage of heat stretching is at 110°C and the stretching ratio is 2.5, which plays a role in gradually relieving stress.

[0041] By designing two-stage hot stretching process conditions, the stability of the orientation degree after stretching can be ensured.

[0042] (4) Heat treatment and false twist treatment: The polyester fiber after the above-mentioned stretching treatment is first heat treated and then subjected to false twist treatment.

[0043] Specifically, the heat treatment process is also a two-stage heat treatment, wherein the temperature of the first stage of heat treatment is 190°C, the time is 20s, and the overfeed rate is 3%. Its function is to relax and heat-set the stretched fibers to eliminate internal stress, stabilize the crystalline structure, and control the crystallinity at about 45% to balance the strength and elasticity of the fibers.

[0044] The second heat treatment temperature is 170℃, the time is 20s, and the overfeed rate is -2%, which is in preparation for the subsequent false twisting treatment.

[0045] The above two-stage heat treatment method, on the one hand, takes over the previous step to achieve the purpose of stabilizing the crystal structure after stretching, and on the other hand, it is to start the next step of false twisting treatment to save energy.

[0046] Specifically, the false twister is a friction type false twister, and the ratio D / Y of the surface linear velocity of the friction disk of the false twister / the velocity of the yarn leaving the friction disk of the false twister is 2.0.

[0047] (5) Post-treatment: The polyester fiber after false twisting in step (4) is guided through a yarn guide, oiled, and then wound to obtain the high-strength, wear-resistant, low-elastic polyester yarn.

[0048] Specifically, the oil used for oiling is a composite oil mixed with silicone oil and polyether modified ester, and the oiling rate is 1.3%.

[0049] Example 2

[0050] A method for preparing high-strength wear-resistant polyester low-elastic yarn specifically comprises the following steps:

[0051] (1) Mixing ingredients: weigh 1000 g of polyester chips with an intrinsic viscosity greater than or equal to 0.95 dL / g, 50 g of a wear-resistant modifier, and 100 g of a toughening modifier, dry and mix them; wherein the wear-resistant modifier is a mixture of nano-silicon dioxide and silicon carbide in a mass ratio of 4:1; and the toughening modifier is polyamide.

[0052] (2) Melt spinning: adding the above-mentioned mixed material into the feed bin of a twin-screw extruder with the temperature and screw speed adjusted in advance for melt blending;

[0053] The temperature of the first zone of the twin-screw extruder is 260°C, the temperature of the second zone is 265°C, the temperature of the third zone is 270°C, the temperature of the fourth zone is 275°C, the head temperature is 280°C, and the screw speed is adjusted to 40r / min to ensure the uniformity of the melt;

[0054] The obtained melt is filtered to remove impurities, and then spun through a spinneret with three-leaf shaped holes and cooled to obtain primary fibers;

[0055] Specifically, the diameter of the three-leaf irregular holes is 0.2 mm, and the aspect ratio of the irregular holes is 5. The aspect ratio design of the spinneret holes is conducive to reducing melt fracture.

[0056] The cooling method is ring-blowing cooling, the cooling temperature is 25° C., and the humidity is 75%.

[0057] (3) Stretching treatment: The obtained primary fibers are pre-stretched to give the molecular chains a preliminary orientation, and then subjected to a two-stage heat stretching treatment.

[0058] Specifically, the pre-stretching temperature is 90° C. and the stretching ratio is 1.5 times, the purpose of which is to preliminarily orient the molecular chains and lay the foundation for the next step of thermal stretching.

[0059] The two-stage heat stretching treatment includes a first stage heat stretching and a second stage heat stretching. The first stage heat stretching temperature is 150°C, the stretching ratio is 4.0, and it is a rapid stretching, which is conducive to improving the orientation degree, thereby improving the fiber strength;

[0060] The second stage of heat stretching is at 110°C and the stretching ratio is 2.5, which plays a role in gradually relieving stress.

[0061] By designing two-stage hot stretching process conditions, the stability of the orientation degree after stretching can be ensured.

[0062] (4) Heat treatment and false twist treatment: The polyester fiber after the above-mentioned stretching treatment is first heat treated and then subjected to false twist treatment.

[0063] Specifically, the heat treatment process is also a two-stage heat treatment, wherein the temperature of the first stage of heat treatment is 190°C, the time is 20s, and the overfeed rate is 3%. Its function is to relax and heat-set the stretched fibers to eliminate internal stress, stabilize the crystalline structure, and control the crystallinity at about 45% to balance the strength and elasticity of the fibers.

[0064] The second heat treatment temperature is 170℃, the time is 20s, and the overfeed rate is -2%, which is in preparation for the subsequent false twisting treatment.

[0065] The above two-stage heat treatment method, on the one hand, takes over the previous step to achieve the purpose of stabilizing the crystal structure after stretching, and on the other hand, it is to start the next step of false twisting treatment to save energy.

[0066] Specifically, the false twister is a friction type false twister, and the ratio D / Y of the surface linear velocity of the friction disk of the false twister / the velocity of the yarn leaving the friction disk of the false twister is 2.0.

[0067] (5) Post-treatment: The polyester fiber after false twisting in step (4) is guided through a yarn guide, oiled, and then wound to obtain the high-strength, wear-resistant, low-elastic polyester yarn.

[0068] Specifically, the oil used for oiling is a composite oil mixed with silicone oil and polyether modified ester, and the oiling rate is 1.0%.

[0069] Comparative Example 1

[0070] Compared with Example 1, the heat stretching process only includes the first stage of heat stretching.

[0071] The performance of the polyester low-elastic yarn prepared in Example 1, Example 2 and Comparative Example 1 was tested, and the results are shown in Table 1 below.

[0072] Table 1

[0073]

[0074] From the above test data, it can be seen that the polyester low-elastic yarn prepared by the present invention has high strength and excellent wear resistance. The two-stage hot stretching can effectively improve the strength of the polyester fiber and also help to improve its wear resistance.

[0075] The polyester low-elastic yarn prepared by the invention is spun into sewing thread for making leather bags without abrasion or fuzzing.

[0076] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. 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 similarly be included within the patent protection scope of the present invention.

Claims

1. A high-strength and wear-resistant polyester drawn textured yarn, characterized in that, Its raw materials include the following components: polyester chips, wear-resistant modifier, and toughening modifier; wherein, the dosage of the wear-resistant modifier is 1% - 10% of the mass of the polyester chips; the dosage of the toughening modifier is 5% - 10% of the mass of the polyester chips; The intrinsic viscosity of the polyester chips is greater than or equal to 0.9 dL / g.

2. The high-strength wear-resistant polyester drawn textured yarn according to claim 1, characterized in that, The wear-resistant modifier is a mixture of nano-silica and silicon carbide mixed at a mass ratio of 1:1 to 4:

1.

3. A high-strength and wear-resistant polyester drawn texturized yarn according to claim 1, characterized in that, The toughening modifier is at least one of polyamide or polyphenylene sulfide.

4. A method for preparing a high-strength and wear-resistant polyester drawn textured yarn according to any one of claims 1-3, characterized in that, It includes the following steps: (1) Batching and mixing: Weigh the polyester chips, wear-resistant modifier, and toughening modifier according to the formula amount, dry and mix them to obtain a mixed material; (2) Melt spinning: Melt and blend the above-mentioned mixed material with a twin-screw extruder. After the obtained melt is filtered to remove impurities, it is spun through a spinneret and cooled to obtain a nascent fiber; (3) Drawing treatment: Perform pre-drawing on the obtained nascent fiber to initially orient the molecular chains, and then perform a two-stage hot drawing treatment; The temperature of the pre-drawing is 85 - 95 °C, and the draw ratio is 1.5 - 2.0 times; For the first stage of the two-stage hot drawing treatment, the drawing temperature is 140 - 150 °C, and the draw ratio is 3.5 - 4.0; for the second stage of drawing, the temperature is 105 - 120 °C, and the draw ratio is 2.0 - 3.0; (4) Heat treatment and false twist treatment: Perform heat treatment on the drawn polyester fiber, and then perform false twist treatment through a false twister; (5) Post-treatment: Guide, oil, and wind up the polyester fiber treated in step (4) to form a shape, and obtain the high-strength wear-resistant polyester draw textured yarn.

5. The preparation method of a high-strength and wear-resistant polyester drawn textured yarn according to claim 4, characterized in that, In step (2), the screw speed of the twin-screw extruder is 35 - 45 r / min.

6. The preparation method of a high-strength and wear-resistant polyester drawn texturing yarn according to claim 4, characterized in that, In step (2), the spinneret has special-shaped holes, the aperture of the special-shaped holes is 0.2 - 0.25 mm, and the aspect ratio of the special-shaped holes is 4 - 5.

7. The preparation method of a high-strength and wear-resistant polyester drawn textured yarn according to claim 4, characterized in that, In step (2), the cooling method is ring blowing cooling, the cooling temperature is 20 - 30 °C, and the humidity is 70 - 80%.

8. The preparation method of a high-strength and wear-resistant polyester drawn texturing yarn according to claim 4, characterized in that, In step (4), the heat treatment is a two-stage heat treatment. The temperature of the first-stage heat treatment is 180 - 200 °C, and the time is 10 - 20 s; the temperature of the second-stage heat treatment is 165 - 175 °C, and the time is 10 - 30 s.

9. The preparation method of a high-strength and wear-resistant polyester drawn textured yarn according to claim 4, characterized in that, In step (4), the false twister is a friction false twister, and the D / Y ratio is 2.0 - 2.

5.

10. The preparation method of a high-strength and wear-resistant polyester drawn texturized yarn according to claim 4, characterized in that, In step (5), the oiling rate of the oiling is 1.0 - 1.3%.

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