Wear-resistant elastic fiber and preparation method thereof

Abstract

The invention relates to the technical field of composite fibers, and discloses a wear-resistant elastic fiber and a preparation method thereof. The preparation method comprises the following steps: reacting montmorillonite with toluene diisocynate to obtain modified montmorillonite, carrying out melt blending on the modified montmorillonite, polyamide 6 slices, polyamide fine powder, the compatilizer and the antioxidant to obtain modified polyamide 6 slices, and carrying out melt spinning on the modified polyamide 6 slices and polyamide elastomer slices by using a positive parallel spinneret plate to obtain the wear-resistant elastic fiber.

Description

Technical Field

[0001] The present invention relates to the technical field of composite fibers, and particularly relates to a wear-resistant elastic fiber and a preparation method thereof. Background Art

[0002] Composite fiber is a new variety of chemical fiber developed internationally in the 1960s. Among them, the composite fiber with two components is also called bicomponent fiber or conjugate fiber. It is to separately convey two kinds of fiber-forming high polymer melts with different components, ratios, viscosities, etc. to the same spinning assembly, converge at an appropriate part of the assembly, and spray out from the same spinneret hole to form a fiber.

[0003] Side-by-side composite fiber is a kind of bicomponent fiber prepared by arranging two polymers with different structures and properties in a side-by-side manner. Due to the difference in thermal shrinkage properties between the two components, side-by-side composite fibers all have a three-dimensional helical crimp structure similar to a spring, making the fibers have excellent elasticity after processing. Therefore, side-by-side composite fibers are widely used in elastic fabric-related products. Due to the cost advantage and processing advantage of polyester, the components used in the research of side-by-side composite fibers at the present stage mainly focus on polyester materials such as PET (polyethylene terephthalate) and PTT (polytrimethylene terephthalate). In recent years, with the localization of polyamide production raw materials, the production cost of polyamide has gradually decreased, and polyamide fibers have developed rapidly. Compared with polyester fibers, polyamide fibers have better skin-friendly comfort. Preparing side-by-side composite fibers with polyamide materials not only utilizes the inherent advantages of the materials but also utilizes the elasticity brought by the fiber crimp structure, having broad application prospects and providing more choices for the development of elastic fibers.

[0004] However, during the use process with long-term large deformations, woven / knitted fabrics containing elastic fibers or products prepared in other forms often have problems such as severe wear and deformation in certain parts. This is mainly related to the reciprocating friction of elastic fibers during use, resulting in surface loss and resilience loss of the fibers, seriously affecting the elasticity, shape retention, and comfort of the products. Therefore, to effectively solve this problem, it is particularly necessary to improve the wear resistance of elastic fibers.

[0005] The prior art, as disclosed in Chinese Patent Application CN101851812A, discloses a side-by-side composite fiber and its manufacturing method. Polyethylene terephthalate chips with an intrinsic viscosity of 0.45 - 0.60 dl / g and polybutylene terephthalate chips with an intrinsic viscosity difference of 0.40 - 1.05 dl / g from polyethylene terephthalate are used. Through a side-by-side composite component, side-by-side fiber coiled yarn is obtained, and the coiled yarn is subjected to false twisting to produce side-by-side composite elastic fiber. This composite fiber needs to be subjected to false twisting to obtain a coiled structure, which is relatively complex and cumbersome in the preparation process. At the same time, the abrasion resistance of this composite fiber has not been improved, limiting its application.

[0006] The prior art, as disclosed in Chinese Patent Application CN106757488A, discloses a nano-modified polyurethane fiber material and its preparation method. Wear-resistant polyurethane elastic fibers are prepared by solution spinning by adding basalt short fibers, wear-resistant additives, etc. However, in a high-viscosity melt system, it is difficult for the additives to be uniformly and stably dispersed in the melt, thereby affecting the performance of the fibers. Summary of the Invention

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a wear-resistant elastic fiber and its preparation method. This wear-resistant elastic fiber has excellent abrasion resistance and elasticity.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0009] A preparation method of a wear-resistant elastic fiber, comprising the following steps:

[0010] Step (1): Mix montmorillonite with toluene, stir, add toluene diisocyanate and stannous octoate, perform ultrasonic dispersion, react, after the reaction ends, centrifuge, wash, dry, grind, and sieve to obtain modified montmorillonite;

[0011] Mix polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder, melt, extrude, and pelletize to obtain modified polyamide 6 chips;

[0012] Step (2): Dry the modified polyamide 6 chips and polyamide elastomer chips, put them into a hopper, set the screw temperature, melt and spin, cool with side air blowing, oil, heat and draw, and wind up to obtain wear-resistant elastic fiber.

[0013] Preferably, in the step (1), when preparing the modified montmorillonite: the mass ratio of montmorillonite, toluene, toluene diisocyanate, and stannous octoate is 1:(20 - 30):(1 - 2):(0.02 - 0.04); the reaction conditions are: react for 6 - 8 h at a temperature of 75 - 85 °C in a nitrogen atmosphere.

[0014] Preferably, in the step (1), when preparing the modified polyamide 6 chips: the mass ratio of polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:(0.2-0.6):(10-15):(2-4):(0.4-0.8).

[0015] Preferably, in the step (1), when preparing the modified polyamide 6 chips: the melting conditions are: melting at a temperature of 230-250°C and a rotation speed of 120-140 r / min; the extrusion conditions are: extruding at a temperature of 200-220°C and a pressure of 0.2-0.4 MPa; the pelletizing conditions are: pelletizing at a rotation speed of 140-160 r / min.

[0016] Preferably, in the step (2), when preparing the wear-resistant elastic fiber: the mass ratio of the modified polyamide 6 fiber chips and the polyamide elastomer chips is 50:(30-70); the temperature of the first screw is 260-270°C, and the temperature of the second screw is 265-280°C.

[0017] Preferably, in the step (2), when preparing the wear-resistant elastic fiber: the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm.

[0018] Preferably, in the step (2), when preparing the wear-resistant elastic fiber: the conditions for side air blowing cooling are: wind speed 0.2-0.4 m / s, air temperature 20-30°C, relative humidity 55-65%; oiling rate: 2-4%; the heating and drawing is three times of hot roll drawing, the temperature of the first hot roll drawing is 65-75°C, the speed is 380-420 m / min, the temperature of the second hot roll drawing is 115-125°C, the speed is 680-720 m / min, the temperature of the third hot roll drawing is 125-135°C, the speed is 980-1020 m / min; the winding conditions are: winding at a speed of 800-1000 m / min.

[0019] Preferably, a wear-resistant elastic fiber prepared by using the preparation method of a wear-resistant elastic fiber as described above.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The present invention reacts montmorillonite with toluene diisocyanate to obtain modified montmorillonite, which increases its interlayer spacing and the grafting amount of organic substances, thereby improving its compatibility with polyamide 6 chips. The modified montmorillonite is uniformly dispersed in the polyamide 6 chips through its nano-filler characteristics, reducing stress concentration, preventing crack propagation, and significantly enhancing the mechanical properties of the material, such as elastic modulus and tensile strength, thus improving its wear resistance; its lamellar structure forms a lubricating film during the friction process, reducing the friction coefficient and wear; at the same time, the modified montmorillonite improves the thermal stability of the polyamide 6 chips, preventing material softening or degradation caused by frictional heat; in addition, the lamellar structure of the modified montmorillonite blocks oxygen and other corrosive media, reducing environmental erosion and indirectly improving its wear resistance. Due to the above effects, the modified polyamide 6 chips have excellent wear resistance, and the elastic fibers obtained by melt spinning them with polyamide elastomer chips have excellent wear resistance.

[0022] Compared with other elastic fibers, the side-by-side elastic fibers of the present invention are prepared by melt spinning, which is more environmentally friendly in the preparation process. The fibers can have a crimp structure without going through processing steps such as false twisting. Due to the difference in thermal shrinkage properties between the two components of the modified polyamide 6 chips and the polyamide elastomer chips, the composite fibers all have a three-dimensional helical crimp structure similar to a spring, making the fibers have excellent elasticity after processing. This crimp comes from the structure of the fibers themselves and is a permanent and stable crimp structure that will not weaken or even disappear over time. It has a great advantage in use compared with the fibers obtained by mechanical crimping methods and can be applied to fields such as wear-resistant elastic fabrics and industrial products. Brief Description of the Drawings

[0023] Figure 1 is the process flow chart for preparing wear-resistant elastic fibers in the present invention;

[0024] Figure 2 is the bar chart of the elastic recovery rate in the comprehensive performance test of the elastic fibers prepared in Examples 1-5 and Comparative Examples 1-2 of the present invention;

[0025] Figure 3 is the bar chart of the number of wear-resistant times of the fabrics made of the elastic fibers prepared in Examples 1-5 and Comparative Examples 1-2 of the present invention in the comprehensive performance test. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0027] Example 1

[0028] This embodiment discloses a preparation method of wear-resistant elastic fibers, comprising the following steps:

[0029] (1) Mix montmorillonite with toluene, stir for 50 min, add toluene diisocyanate and stannous octoate, ultrasonically disperse for 50 min, react at 85 °C under a nitrogen atmosphere for 6 h. After the reaction ends, centrifuge, take the centrifuged precipitate, add toluene with a mass 2 times that of the centrifuged precipitate and wash 5 times, dry at 80 °C for 8 h. After drying ends, grind and sieve through a 160-mesh sieve to obtain modified montmorillonite;

[0030] Among them, the mass ratio of montmorillonite, toluene, toluene diisocyanate, and stannous octoate is 1:30:2:0.04;

[0031] Mix polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder. Melt at 250 °C and a rotation speed of 140 r / min, extrude at 220 °C and a pressure of 0.4 MPa, and pelletize at a rotation speed of 160 r / min to obtain modified polyamide 6 chips;

[0032] Among them, the mass ratio of polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:0.6:15:4:0.8;

[0033] (2) Dry the modified polyamide 6 chips and polyamide elastomer chips at 120 °C for 16 h. After drying ends, put the modified polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively, set the screw temperature. The temperature of screw No. 1 is 270 °C, and the temperature of screw No. 2 is 280 °C. Use a positive side-by-side spinneret to melt-spin. After spinning ends, cool with side air blowing, apply oil, heat and draw, and wind at a speed of 1000 m / min to obtain wear-resistant elastic fibers;

[0034] Among them, the mass ratio of the modified polyamide 6 fiber chips and polyamide elastomer chips is 50:70; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side air blowing cooling are: wind speed 0.4 m / s, air temperature 30 °C, relative humidity 65%; oil application rate: 4%; the heat drawing is three times of hot roll drawing. The temperature of the first hot roll drawing is 75 °C, the speed is 420 m / min, the temperature of the second hot roll drawing is 125 °C, the speed is 720 m / min, and the temperature of the third hot roll drawing is 135 °C, the speed is 1020 m / min.

[0035] Example 2

[0036] This embodiment discloses a preparation method of wear-resistant elastic fibers, comprising the following steps:

[0037] (1) Mix montmorillonite with toluene, stir for 30 min, add toluene diisocyanate and stannous octoate, ultrasonically disperse for 30 min, react at 75 °C under a nitrogen atmosphere for 8 h. After the reaction, centrifuge, take the centrifuged precipitate, add toluene with a mass 4 times that of the centrifuged precipitate and wash 3 times, dry at 60 °C for 12 h. After drying, grind and sieve through a 160-mesh sieve to obtain modified montmorillonite;

[0038] Among them, the mass ratio of montmorillonite, toluene, toluene diisocyanate, and stannous octoate is 1:20:1:0.02;

[0039] Mix polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder. Melt at 230 °C and a rotation speed of 120 r / min, extrude at 200 °C and a pressure of 0.2 MPa, and pelletize at a rotation speed of 140 r / min to obtain modified polyamide 6 chips;

[0040] Among them, the mass ratio of polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:0.2:10:2:0.4;

[0041] (2) Dry the modified polyamide 6 chips and polyamide elastomer chips at 100 °C for 20 h. After drying, put the modified polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively, set the screw temperature, the temperature of screw No. 1 is 260 °C, the temperature of screw No. 2 is 265 °C, use a positive juxtaposed spinneret to melt-spin. After spinning, cool with side air blowing, apply oil, heat and draw, and wind at a speed of 800 m / min to obtain wear-resistant elastic fibers;

[0042] Among them, the mass ratio of the modified polyamide 6 fiber chips and polyamide elastomer chips is 50:30; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side air blowing cooling are: air speed 0.2 m / s, air temperature 20 °C, relative humidity 55%; oil application rate: 2%; the heat drawing is three times of hot roller drawing, the temperature of the first hot roller drawing is 65 °C, the speed is 380 m / min, the temperature of the second hot roller drawing is 115 °C, the speed is 680 m / min, and the temperature of the third hot roller drawing is 125 °C, the speed is 980 m / min.

[0043] Example 3

[0044] This example discloses a preparation method of wear-resistant elastic fibers, including the following steps:

[0045] (1) Mix montmorillonite with toluene, stir for 45 min, add toluene diisocyanate and stannous octoate, ultrasonically disperse for 45 min, react at 82 °C under a nitrogen atmosphere for 6.5 h. After the reaction, centrifuge, take the centrifuged precipitate, add toluene with a mass 2 times that of the centrifuged precipitate and wash 5 times, dry at 75 °C for 9 h. After drying, grind and sieve through a 160-mesh sieve to obtain modified montmorillonite;

[0046] Among them, the mass ratio of montmorillonite, toluene, toluene diisocyanate, and stannous octoate is 1:28:2:0.04;

[0047] Mix polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder. Melt at 245 °C and a rotation speed of 135 r / min, extrude at 215 °C and a pressure of 0.4 MPa, and pelletize at a rotation speed of 155 r / min to obtain modified polyamide 6 chips;

[0048] Among them, the mass ratio of polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:0.5:14:3.5:0.7;

[0049] (2) Dry the modified polyamide 6 chips and polyamide elastomer chips at 115 °C for 17 h. After drying, put the modified polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively, set the screw temperature, the temperature of screw No. 1 is 268 °C, and the temperature of screw No. 2 is 278 °C. Use a positive side-by-side spinneret to melt-spin. After spinning, cool with side air blowing, apply oil, heat and draw, and wind at a speed of 950 m / min to obtain wear-resistant elastic fibers;

[0050] Among them, the mass ratio of the modified polyamide 6 fiber chips and polyamide elastomer chips is 50:60; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side air blowing cooling are: wind speed 0.4 m / s, air temperature 28 °C, relative humidity 62%; oil application rate: 3.5%; heat drawing is three times of hot roll drawing, the temperature of the first hot roll drawing is 72 °C, the speed is 410 m / min, the temperature of the second hot roll drawing is 122 °C, the speed is 710 m / min, and the temperature of the third hot roll drawing is 132 °C, the speed is 1010 m / min.

[0051] Example 4

[0052] This example discloses a preparation method of wear-resistant elastic fibers, including the following steps:

[0053] (1) Mix montmorillonite with toluene, stir for 40 min, add toluene diisocyanate and stannous octoate, ultrasonically disperse for 40 min, react at 80 °C under a nitrogen atmosphere for 7 h. After the reaction, centrifuge, take the centrifuged precipitate, add toluene with a mass 3 times that of the centrifuged precipitate and wash 4 times, dry at 70 °C for 10 h. After drying, grind and sieve through a 160-mesh sieve to obtain modified montmorillonite;

[0054] Among them, the mass ratio of montmorillonite, toluene, toluene diisocyanate, and stannous octoate is 1:25:1.5:0.03;

[0055] Mix polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder. Melt at 240 °C and a rotation speed of 130 r / min, extrude at 210 °C and a pressure of 0.3 MPa, and pelletize at a rotation speed of 150 r / min to obtain modified polyamide 6 chips;

[0056] Among them, the mass ratio of polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:0.4:12.5:3:0.6;

[0057] (2) Dry the modified polyamide 6 chips and polyamide elastomer chips at 110 °C for 18 h. After drying, put the modified polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively, set the screw temperature, the temperature of screw No. 1 is 265 °C, and the temperature of screw No. 2 is 275 °C. Use a positive side-by-side spinneret to melt-spin. After spinning, cool with side air blowing, apply oil, heat and draw, and wind at a speed of 900 m / min to obtain wear-resistant elastic fibers;

[0058] Among them, the mass ratio of the modified polyamide 6 fiber chips and the polyamide elastomer chips is 50:50; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side air blowing cooling are: wind speed 0.3 m / s, air temperature 25 °C, relative humidity 60%; oil application rate: 3%; the heat drawing is three times of hot roll drawing, the temperature of the first hot roll drawing is 70 °C, the speed is 400 m / min, the temperature of the second hot roll drawing is 120 °C, the speed is 700 m / min, and the temperature of the third hot roll drawing is 130 °C, the speed is 1000 m / min.

[0059] Example 5

[0060] This example discloses a preparation method of wear-resistant elastic fibers, including the following steps:

[0061] (1) Mix montmorillonite with toluene, stir for 35 min, add toluene diisocyanate and stannous octoate, ultrasonically disperse for 35 min, react at 78 °C under a nitrogen atmosphere for 7.5 h. After the reaction, centrifuge, take the centrifuged precipitate, add toluene with a mass 4 times that of the centrifuged precipitate and wash 3 times, dry at 65 °C for 11 h. After drying, grind and sieve through a 160-mesh sieve to obtain modified montmorillonite;

[0062] Among them, the mass ratio of montmorillonite, toluene, toluene diisocyanate, and stannous octoate is 1:22:1:0.02;

[0063] Mix polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder. Melt at 235 °C and 125 r / min, extrude at 205 °C and 0.2 MPa, and pelletize at 145 r / min to obtain modified polyamide 6 chips;

[0064] Among them, the mass ratio of polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:0.3:11:2.5:0.5;

[0065] (2) Dry the modified polyamide 6 chips and polyamide elastomer chips at 105 °C for 19 h. After drying, put the modified polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively, set the screw temperature, the temperature of screw No. 1 is 262 °C, the temperature of screw No. 2 is 270 °C, use a positive side-by-side spinneret to melt-spin. After spinning, cool with side air blowing, oiling, heat drawing, and wind up at a speed of 850 m / min to obtain wear-resistant elastic fibers;

[0066] Among them, the mass ratio of the modified polyamide 6 fiber chips and polyamide elastomer chips is 50:40; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side air blowing cooling are: wind speed 0.2 m / s, air temperature 22 °C, relative humidity 58%; oiling rate: 2.5%; heat drawing is three times of hot roll drawing, the temperature of the first hot roll drawing is 68 °C, the speed is 390 m / min, the temperature of the second hot roll drawing is 118 °C, the speed is 690 m / min, and the temperature of the third hot roll drawing is 128 °C, the speed is 990 m / min.

[0067] Comparative Example 1

[0068] This comparative example discloses a method for preparing elastic fibers, including the following steps:

[0069] (1) Mix the polyamide 6 chips, montmorillonite, polyamide fine powder, compatibilizer, and antioxidant evenly and add them to a twin-screw extruder. Melt at a temperature of 230°C and a rotation speed of 120 r / min, extrude at a temperature of 200°C and a pressure of 0.2 MPa, and pelletize at a rotation speed of 140 r / min to obtain modified polyamide 6 chips;

[0070] Among them, the mass ratio of polyamide 6 chips, montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:0.2:10:2:0.4;

[0071] (2) Dry the modified polyamide 6 chips and polyamide elastomer chips at a temperature of 100°C for 20 h. After drying, put the modified polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively. Set the screw temperature. The temperature of screw No. 1 is 260°C, and the temperature of screw No. 2 is 265°C. Use a positive side-by-side spinneret to melt-spin. After spinning, cool with side air blowing, apply oil, heat and draw, and wind at a speed of 800 m / min to obtain elastic fibers;

[0072] Among them, the mass ratio of modified polyamide 6 fiber chips and polyamide elastomer chips is 50:30; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side air blowing cooling are: wind speed 0.2 m / s, air temperature 20°C, relative humidity 55%; oil application rate: 2%; the heat drawing is three times of hot roll drawing. The temperature of the first hot roll drawing is 65°C, the speed is 380 m / min, the temperature of the second hot roll drawing is 115°C, the speed is 680 m / min, and the temperature of the third hot roll drawing is 125°C, the speed is 980 m / min.

[0073] Comparative Example 2

[0074] This comparative example discloses a method for preparing elastic fibers, including the following steps:

[0075] (1) Dry the polyamide 6 chips and polyamide elastomer chips at a temperature of 100°C for 20 h. After drying, put the polyamide 6 fiber chips and polyamide elastomer chips into hopper No. 1 and hopper No. 2 respectively. Set the screw temperature. The temperature of screw No. 1 is 260°C, and the temperature of screw No. 2 is 265°C. Use a positive side-by-side spinneret to melt-spin. After spinning, cool with side air blowing, apply oil, heat and draw, and wind at a speed of 800 m / min to obtain elastic fibers;

[0076] Among them, the mass ratio of polyamide 6 fiber chips to polyamide elastomer chips is 50:30; the number of holes in the spinneret is 36, and the spinneret specification is 0.28×0.84 mm; the conditions for side blow air cooling are: air speed 0.2 m / s, air temperature 20 °C, relative humidity 55%; oiling rate: 2%; heating and drawing is three - stage hot roller drawing. The temperature of the first hot roller drawing is 65 °C, the speed is 380 m / min, the temperature of the second hot roller drawing is 115 °C, the speed is 680 m / min, and the temperature of the third hot roller drawing is 125 °C, the speed is 980 m / min.

[0077] In the above - mentioned examples and comparative examples: The montmorillonite comes from Southern Clay Products, Inc. of the United States, model: 30B; Toluene comes from Beijing Chemical Plant, CAS number: 108 - 88 - 3; Toluene diisocyanate comes from Beijing Merckda Technology Co., Ltd., product name: M057839, CAS number: 26471 - 62 - 5; Stannous octoate comes from Sigma - Aldrich, CAS number: 301 - 10 - 0; Polyamide 6 chips come from Suzhou Baolidi Material Technology Co., Ltd., product name: PA6003A1, specification: fiber grade; Polyamide fine powder comes from Suzhou Subest Import & Export Co., Ltd., model: A3KF, 1000 mesh; Compatibilizer comes from Shenzhen Huixin Plastic Chemical Co., Ltd., model: Fusabond N525; Antioxidant comes from Jining Tangyi Chemical Co., Ltd., model: B215; Polyamide elastomer chips come from Beijing Xuyang Technology Co., Ltd., product name: TPA6510.

[0078] Test Example

[0079] (1) Comprehensive performance test

[0080] The comprehensive performance of the elastic fibers prepared in Examples 1 - 5 and Comparative Examples 1 - 2 was tested. The specific test results are shown in Table 1; the elastic fibers prepared in Examples 1 - 5 and Comparative Examples 1 - 2 were made into fabrics (gram weight 150 g / m 2 ), and were respectively denoted as Samples 1 - 7. The wear resistance of Samples 1 - 7 was tested. The specific test results are shown in Table 2:

[0081] Table 1

[0082] Fineness (dtex) Elastic recovery rate (%) Example 1 235.16 94.13 Example 2 228.95 91.82 Example 3 233.64 93.78 Example 4 231.79 93.04 Example 5 230.15 92.39 Comparative Example 1 227.52 84.25 Comparative Example 2 191.37 90.07

[0083] Table 2

[0084] Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Abrasion resistance times (times) 29300 28080 29060 28750 28420 17830 6700

[0085] The detection of each index in Table 1 and Table 2 is based on the following standards respectively: The fineness is determined by GB / T 14343-2008 "Test Method for Linear Density of Chemical Fiber Filaments"; The elastic recovery rate is determined by GB / T 14344-2022 "Test Method for Tensile Properties of Chemical Fiber Filaments", and the fixed elongation value is 10%; The abrasion resistance times are determined by ASTM D3884 "Test Method for Abrasion Resistance of Fabrics (Rotating Platform, Double-Ended Method)".

[0086] It can be seen from the test results of Table 1 and Table 2 that the wear-resistant elastic fiber prepared by the present invention has excellent wear resistance and elasticity.

[0087] In Comparative Example 1, montmorillonite was not activated, the interlayer spacing was not increased, and the compatibility with polyamide 6 chips was poor, so it could not be evenly dispersed in polyamide 6 chips, resulting in a decrease in its elastic and wear-resistant properties. Therefore, the elastic recovery rate of Comparative Example 1 is smaller than that of the example, and the abrasion resistance times of the fabric made are smaller than those of the example.

[0088] In Comparative Example 2, only polyamide 6 chips and polyamide elastomer chips were melt-spun, and polyamide 6 chips were not modified. Since the wear-resistant component-modified montmorillonite and polyamide fine powder were not added, the lubricating and barrier effects of the lamellar structure were lacking, resulting in a significant decrease in its wear-resistant performance. Therefore, the abrasion resistance times of the fabric made in Comparative Example 2 are much smaller than those of the example.

[0089] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a wear-resistant elastic fiber, characterized in that: The following steps are involved: Step (1), mixing montmorillonite with toluene, stirring, adding toluene diisocyanate and stannous octoate, ultrasonically dispersing, reacting, and after the reaction is completed, purifying, grinding, and sieving to obtain modified montmorillonite; The polyamide 6 chips, modified montmorillonite, polyamide fine powder, compatibilizer and antioxidant are uniformly mixed and added into a twin-screw extruder, melted, extruded and pelletized to obtain modified polyamide 6 chips; Step (2), drying the modified polyamide 6 slices and the polyamide elastomer slices, putting them into a hopper, setting the screw temperature, melt spinning, side-blowing cooling, oiling, heating and stretching, and winding to obtain wear-resistant elastic fibers.

2. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (1), when preparing the modified montmorillonite, the mass ratio of montmorillonite, toluene, toluene diisocyanate and stannous octoate is 1:(20-30):(1-2):(0.02-0.04).

3. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (1), when preparing the modified montmorillonite, the reaction conditions are: reacting in a nitrogen atmosphere at a temperature of 75-85° C. for 6-8 hours.

4. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (1), when preparing modified polyamide 6 slices: the mass ratio of polyamide 6 slices, modified montmorillonite, polyamide fine powder, compatibilizer, and antioxidant is 100:(0.2-0.6):(10-15):(2-4):(0.4-0.8).

5. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (1), when preparing modified polyamide 6 slices: the melting conditions are: melting at a temperature of 230-250° C. and a rotation speed of 120-140 r / min; the extrusion conditions are: extrusion at a temperature of 200-220° C. and a pressure of 0.2-0.4 MPa; and the pelletizing conditions are: pelletizing at a rotation speed of 140-160 r / min.

6. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (2), the mass ratio of the modified polyamide 6 fiber slices to the polyamide elastomer slices is 50:(30-70); the temperature of screw No. 1 is 260-270°C, and the temperature of screw No. 2 is 265-280°C.

7. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (2), the number of spinneret holes is 36, and the specification of the spinneret is 0.28×0.84 mm; the conditions for side-blowing cooling are: wind speed 0.2-0.4 m / s, wind temperature 20-30° C., relative humidity 55-65%; and the oiling rate is 2-4%.

8. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (2), the heating and stretching is performed by three hot roller stretchings, wherein the temperature of the first hot roller stretching is 65-75°C and the speed is 380-420 m / min, the temperature of the second hot roller stretching is 115-125°C and the speed is 680-720 m / min, and the temperature of the third hot roller stretching is 125-135°C and the speed is 980-1020 m / min.

9. The method for preparing a wear-resistant elastic fiber according to claim 1, characterized in that: In the step (2), the winding condition is: winding at a speed of 800-1000 m / min.

10. A wear-resistant elastic fiber prepared by the method for preparing a wear-resistant elastic fiber according to any one of claims 1 to 9.

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