A regenerated blended cotton yarn and its production process

Abstract

The present invention discloses a regenerated blended cotton yarn and its production process, belonging to the technical field of spinning. It includes 30 - 45% of conductive fiber sliver, 45 - 55% of sweat-absorbing and moisture-wicking fiber sliver, and the balance is functional fiber sliver; the weight percentages of the components in the conductive fiber sliver are: 20 - 25% of regenerated cotton fiber, 60 - 65% of thermosensitive conductive fiber, and the balance is absorbent fiber; a long-lasting conductive coating is provided on the surface of the conductive fiber sliver; the thermosensitive conductive fiber has a skin-core structure composed of a thermosensitive skin layer and a polyester core layer, and the weight percentages of the components in the sweat-absorbing and moisture-wicking fiber sliver are: 45 - 50% of regenerated cotton fiber, 35 - 40% of raw cotton fiber, and the balance is moisture-absorbing and sweat-wicking fiber. The regenerated blended cotton yarn and its production process of the present invention ensure the strength of the regenerated blended cotton yarn through polyester fiber, and perform antistatic treatment on the polyester fiber prone to generating static electricity alone, without affecting the moisture absorption of the whole cotton yarn, and having long-lasting antistatic ability.

Description

Technical Field

[0001] The invention specifically relates to a regenerated blended cotton yarn and a production process thereof, and belongs to the technical field of spinning. Background Art

[0002] Regenerated blended cotton yarn is usually a cotton yarn product obtained by blending regenerated cotton yarn with chemical fibers of different colors; for example, polyester-cotton blended fabric is usually made of 65% polyester and 35% cotton yarn; for example, Chinese patent publication number: CN116536921A discloses a regenerated blended cotton yarn, which is treated with a surface treatment agent. The surface treatment agent components are sodium dodecyl sulfonate, graphene powder, p-methoxy salicylaldehyde, 3,4-dimethoxyphenylacetonitrile, sodium ethoxide, silicone oil emulsion, anhydrous ethanol and water; the process first prepares the surface treatment agent, and the regenerated blended cotton yarn is subjected to two dipping and two rolling; although the regenerated blended cotton yarn obtained by this process has antistatic properties, it is affected by the process and the surface treatment agent. The effect is that the moisture absorption performance is greatly reduced, and after the recycled blended cotton yarn is washed for a long time, the surface treatment agent will still peel off the recycled blended cotton yarn, thereby reducing the anti-static performance; for example, China Patent Authorization Announcement No.: CN112458585B discloses a water-absorbent renewable blended cotton yarn, which is mainly made of waste cotton fabrics and cotton yarn scraps as the main raw materials, and copper ammonia fiber is added as an auxiliary fiber material. While maintaining good water absorption, it can effectively improve the overall strength and feel of the fiber. The structure uses copper ammonia fiber as the conductive fiber. In the existing technology, through physical blending of conductive fibers or simple auxiliary agent treatment, the conductive fibers are broken or the auxiliary agents are peeled off after washing, and the anti-static performance is easily lost. Summary of the Invention

[0003] To solve the above problems, the present invention proposes a regenerated blended cotton yarn and a production process thereof. The strength of the regenerated blended cotton yarn is ensured by polyester fiber, and anti-static treatment is performed separately on the polyester fiber that is prone to static electricity, which does not affect the hygroscopicity of the entire cotton yarn and has long-lasting anti-static ability.

[0004] The regenerated blended cotton yarn of the present invention comprises 30-45% conductive fiber sliver, 45-55% moisture-wicking and moisture-absorbing fiber sliver, and the balance is functional fiber sliver; the weight percentage of each component in the conductive fiber sliver is: 20-25% regenerated cotton fiber, 60-65% thermosensitive conductive fiber, and the balance is absorbent fiber; the surface of the conductive fiber sliver is provided with a long-lasting conductive coating; the thermosensitive conductive fiber has a skin-core structure consisting of a thermosensitive skin layer and a polyester core layer, and the weight percentage of each component in the moisture-wicking and moisture-absorbing fiber sliver is: 45-50% regenerated cotton fiber, 35-40% virgin cotton fiber, and the balance is moisture-wicking and moisture-absorbing fiber.

[0005] The conductive fiber sliver is made of recycled cotton fiber, thermosensitive conductive fiber and absorbent fiber; among them, the absorbent fiber is blended into the conductive fiber sliver. When the fine grooves on the surface of the absorbent fiber are impregnated with the long-acting conductive coating, the conductive agent can be fully absorbed; thus, the conductive fiber sliver has good antistatic effect, and due to the anchoring effect formed by the fine grooves, the anti-peeling effect of the long-acting conductive coating can be improved. In addition, the recycled cotton fiber also has the effects of absorbing the conductive agent and anti-peeling; when the recycled cotton fiber, thermosensitive conductive fiber and absorbent fiber are mixed, the long-acting conductive coating forms scattered conductive islands on the surface of the thermosensitive conductive fiber. Through the conductive functions of the recycled cotton fiber and absorbent fiber, the scattered conductive islands can be connected to each other; thus forming a conductive network; making the entire conductive fiber sliver have excellent antistatic effect, and still having antistatic effect after being washed many times. When the antistatic performance cannot meet the requirements after long-term washing (≥100 times), through ironing with an electric iron, the conductive performance of the thermosensitive conductive fiber is thermally restored, and the conductive islands are rebuilt, making the thermosensitive conductive fiber have excellent antistatic effect;

[0006] The sweat-absorbing and moisture-wicking fiber sliver is made of recycled cotton fiber, raw cotton fiber and moisture-absorbing and sweat-wicking fiber. The sweat-absorbing and moisture-wicking fiber sliver has good sweat-absorbing and moisture-wicking performance. Due to the special cross-section of the moisture-absorbing and sweat-wicking fiber, its anti-bending performance is better than that of other circular cross-section fibers, and the capillary effect on the surface of the moisture-absorbing and sweat-wicking fiber can quickly export sweat, so that the fabric can achieve the effect of quick moisture absorption and drying. The strength of the moisture-absorbing and sweat-wicking fiber (polyester) is slightly lower than that of ordinary polyester fibers. By mixing a small amount of moisture-absorbing and sweat-wicking fibers into the recycled cotton fiber and raw cotton fiber, the strength of the sliver can be improved. After drawing and blending, it can match the strength of the conductive fiber sliver, improve the evenness level of the yarn, and improve the quality of the yarn; at the same time, it can avoid the yarn texture being too hard and affecting the use comfort of textile products.

[0007] Furthermore, the functional fiber sliver is one of bamboo charcoal fiber, fluorescent whitening polyester fiber and polyester cool fiber, and the corresponding functional fiber sliver can be selected according to the application scenario to meet the scenario requirements.

[0008] Furthermore, the absorbent fiber is viscose fiber or moisture-absorbing and sweat-wicking fiber; due to the surface structure and high hygroscopicity of the viscose fiber or moisture-absorbing and sweat-wicking fiber, the long-acting conductive coating can be fully absorbed and anchored, improving the overall anti-peeling ability.

[0009] Further, the weight percentages of the components in the thermosensitive skin layer of the thermosensitive conductive fiber are as follows: 30-35% of LPET conductive masterbatch, and the balance is common polyester; the polyester core layer of the thermosensitive conductive fiber is made of common polyester; the thermosensitive skin layer and the polyester core layer of the thermosensitive conductive fiber are each melted by a screw and spun and cooled into shape through a composite spinning device to obtain composite fiber filaments, and then the composite fiber filaments are cut to match their length with that of viscose fibers; when the thermosensitive conductive fiber works, by heating the thermosensitive conductive fiber, LPET melts and flows, and carbon black migrates to the fiber surface layer, and a continuous conductive film is formed after cooling.

[0010] Further, the processing process of the long-lasting conductive coating is as follows: dipping the conductive fiber sliver into the long-lasting conductive coating solution, then centrifugally removing the excess liquid, and drying and curing at 80-100 °C; the weight percentages of the components in the long-lasting conductive coating solution are as follows: 65-70% of a conductive agent, and the balance is a bonding enhancer. The weight percentages of the components of the conductive agent are 70-85% of sodium dodecyl sulfonate, and the balance is graphene powder. The weight percentages of the components of the bonding enhancer are 40-45% of p-methoxysalicylaldehyde, and the balance is 3,4-dimethoxyphenylacetonitrile. Sodium dodecyl sulfonate and graphene powder accelerate electrostatic leakage through the synergistic effect of ions and mineral conduction; to enable the long-lasting conductive coating to have strong electrostatic leakage performance, a small amount of recycled cotton fibers and thermosensitive conductive fibers in the conductive fiber sliver cooperate, so that the p-methoxysalicylaldehyde in the long-lasting conductive coating forms a hydrogen bond with the hydroxyl group of the recycled cotton fiber, and the methoxy group of p-methoxysalicylaldehyde conjugates with the benzene ring of the thermosensitive conductive fiber; p-methoxysalicylaldehyde reacts with 3,4-dimethoxyphenylacetonitrile to form a conjugated long chain, and conductive islands are distributed on the surface of the conductive fiber sliver; the conductive islands can be interconnected through the conductive functions modified by the recycled cotton fibers and absorbent fibers; a conductive network is formed;

[0011] A production process for recycled blended cotton yarn is used to produce recycled blended cotton yarn. The production process is as follows: separately processing the conductive fiber sliver, the sweat-absorbing and moisture-wicking fiber sliver, and the functional fiber sliver in the opening and cleaning process and the carding process, and then mixing them in the drawing process to obtain recycled blended cotton yarn.

[0012] Further, when mixing in the drawing process, the number ratio of the conductive fiber sliver, the sweat-absorbing and moisture-wicking fiber sliver, and the functional fiber sliver is: 3:3:1.

[0013] Further, the processing process of the conductive fiber sliver is specifically as follows: mixing the recycled cotton fibers, the thermosensitive conductive fibers, and the absorbent fibers through a multi-bin cotton mixer for opening and cleaning, and then carding to obtain a base sliver; and feeding the base sliver into an impregnation device for impregnation for 10-20 minutes, and the impregnation device is filled with a long-lasting conductive coating solution; then, pulling it out at a constant speed and drying it through a hot air oven to obtain a conductive fiber sliver.

[0014] Compared with the prior art, the regenerated blended cotton yarn of the present invention and its production process ensure the strength of the regenerated blended cotton yarn through polyester fibers, and separately conduct antistatic treatment on the polyester fibers that are prone to generating static electricity. After blending the conductive fiber sliver and the sweat-absorbing and moisture-wicking fiber sliver, a cotton yarn with long-term antistatic and excellent moisture-wicking properties can be obtained. When the antistatic performance of the cotton yarn decreases due to multiple washes, the antistatic performance can be thermally restored multiple times; the service life of the antistatic finished product of cotton yarn weaving is extended. Specific Embodiments

[0015] The regenerated blended cotton yarn of the present invention comprises 30 - 45% of conductive fiber sliver, 45 - 55% of sweat-absorbing and moisture-wicking fiber sliver, and the balance is functional fiber sliver; the weight percentages of the components in the conductive fiber sliver are: 20 - 25% of regenerated cotton fiber, 60 - 65% of thermosensitive conductive fiber, and the balance is absorption fiber; a long-term conductive coating is provided on the surface of the conductive fiber sliver; the thermosensitive conductive fiber has a core-shell structure composed of a thermosensitive cortex and a polyester core layer, and the weight percentages of the components in the sweat-absorbing and moisture-wicking fiber sliver are: 45 - 50% of regenerated cotton fiber, 35 - 40% of raw cotton fiber, and the balance is moisture-absorbing and sweat-wicking fiber.

[0016] The conductive fiber sliver uses regenerated cotton fiber, thermosensitive conductive fiber and absorption fiber; among them, absorption fiber is blended into the conductive fiber sliver. When the fine grooves on the surface of the absorption fiber are impregnated with the long-term conductive coating, the conductive agent can be fully absorbed; the conductive fiber sliver has a good antistatic effect, and due to the anchoring effect formed by the fine grooves, the anti-peeling effect of the long-term conductive coating can be improved. In addition, the regenerated cotton fiber also has the effects of absorbing the conductive agent and anti-peeling; when the regenerated cotton fiber, thermosensitive conductive fiber and absorption fiber are mixed, the long-term conductive coating forms distributed conductive islands on the surface of the thermosensitive conductive fiber. Through the conductive functions of the regenerated cotton fiber and the absorption fiber, the distributed conductive islands can be connected to each other; a conductive network is formed; the entire conductive fiber sliver has an excellent antistatic effect, and still has an antistatic effect after multiple washes. When the antistatic performance cannot meet the requirements after long-term washing (≥100 times), through ironing with an electric iron, the conductive performance of the thermosensitive conductive fiber is thermally restored, and the conductive islands are re-constructed, so that the thermosensitive conductive fiber has an excellent antistatic effect;

[0017] The carded sliver of sweat-absorbing and moisture-wicking fiber is made of recycled cotton fiber, virgin cotton fiber and sweat-absorbing and moisture-wicking fiber. The carded sliver of sweat-absorbing and moisture-wicking fiber has good sweat-absorbing and moisture-wicking performance. Due to the special cross-section of the sweat-absorbing and moisture-wicking fiber, its bending resistance is better than that of other circular cross-section fibers. Moreover, the capillary effect on the surface of the sweat-absorbing and moisture-wicking fiber can quickly export sweat, so that the fabric can achieve the effect of quick moisture absorption and drying. The strength of the sweat-absorbing and moisture-wicking fiber (polyester) is slightly lower than that of ordinary polyester fibers. By mixing a small amount of sweat-absorbing and moisture-wicking fiber into recycled cotton fiber and virgin cotton fiber, the strength of the carded sliver can be improved. After drawing and blending, it can match the strength of the conductive fiber carded sliver, improve the evenness level of the yarn, and improve the quality of the yarn. At the same time, it can avoid the yarn texture being too hard and affecting the use comfort of textile products.

[0018] The functional fiber carded sliver is one of bamboo charcoal fiber, fluorescent brightening polyester fiber and polyester cool fiber. According to the application scenario, the corresponding functional fiber carded sliver can be selected to meet the scenario requirements.

[0019] The absorbent fiber is viscose fiber or sweat-absorbing and moisture-wicking fiber. Through the surface structure and high hygroscopicity of viscose fiber or sweat-absorbing and moisture-wicking fiber, the long-lasting conductive coating can be fully absorbed and anchored, and the overall anti-peeling ability can be improved.

[0020] The weight percentage of each component in the thermosensitive skin layer of the thermosensitive conductive fiber is 30-35% of LPET conductive masterbatch, and the balance is general polyester; the polyester core layer of the thermosensitive conductive fiber is made of general polyester; the thermosensitive skin layer and the polyester core layer of the thermosensitive conductive fiber are each melted by a screw and spun and cooled through a composite spinning device to obtain a composite fiber filament. Then the composite fiber filament is cut to match its length with the length of the viscose fiber. When the thermosensitive conductive fiber works, by heating the thermosensitive conductive fiber, LPET melts and flows, and carbon black migrates to the fiber surface layer and forms a continuous conductive film after cooling.

[0021] The processing of the long-acting conductive coating is as follows: Immerse the conductive fiber sliver in the long-acting conductive coating solution, then, centrifuge to remove the excess liquid, and dry and cure it at 80-100 °C; The component weight percentages in the long-acting conductive coating solution are: 65-70% of the conductive agent, and the balance is the bonding enhancer. The component weight percentage of the conductive agent is 70-85% of sodium dodecyl sulfonate, and the balance is graphene powder. The component weight percentage of the bonding enhancer is 40-45% of p-methoxysalicylaldehyde, and the balance is 3,4-dimethoxyphenylacetonitrile. Sodium dodecyl sulfonate and graphene powder accelerate electrostatic leakage through the synergistic effect of ions and mineral conduction; enable the long-acting conductive coating to have strong electrostatic leakage performance. A small amount of recycled cotton fiber and thermosensitive conductive fiber in the conductive fiber sliver cooperate to form hydrogen bonds between the p-methoxysalicylaldehyde of the long-acting conductive coating and the hydroxyl group of the recycled cotton fiber, and the methoxy group of p-methoxysalicylaldehyde is conjugated with the benzene ring of the thermosensitive conductive fiber; p-methoxysalicylaldehyde reacts with 3,4-dimethoxyphenylacetonitrile to form a conjugated long chain, and conductive islands are distributed on the surface of the conductive fiber sliver; the conductive islands can be interconnected through the conductive functions modified by the recycled cotton fiber and the absorbent fiber; forming a conductive network;

[0022] A production process for recycled blended cotton yarn is used to produce recycled blended cotton yarn. The production process is as follows: Separate the processing of the conductive fiber sliver, the sweat-absorbing and moisture-wicking fiber sliver, and the functional fiber sliver in the opening and cleaning process and the carding process, and then mix them in the drawing process to obtain the recycled blended cotton yarn.

[0023] When mixing in the drawing process, the number ratio of the conductive fiber sliver, the sweat-absorbing and moisture-wicking fiber sliver, and the functional fiber sliver is: 3:3:1.

[0024] The processing process of the conductive fiber sliver is specifically as follows: Mix the recycled cotton fiber, the thermosensitive conductive fiber, and the absorbent fiber through a multi-bin mixing machine for opening and cleaning, and then card to obtain a base sliver; And send the base sliver into the impregnation equipment for impregnation for 10-20 minutes. The impregnation equipment is filled with a long-acting conductive coating solution; Then, pull it out evenly and dry it through a hot air oven to obtain the conductive fiber sliver.

[0025] Example 1:

[0026] When processing the thermosensitive conductive fiber, first prepare the conductive masterbatch:

[0027] First, the raw material ratio (parts by weight) is as follows: LPET with a melting point of 110°C, 100 parts; carbon black (particle size 30 nm, DBP oil absorption value 300 ml / 100 g): 15 parts; polyethylene wax (dispersant): 1 part. Then, the above raw materials are dried and mixed. First, the LPET chips are dried in a blast dryer at 80°C (water content ≤ 0.02%); then the carbon black and the dispersant are added to a high-speed mixer (500 rpm, 30 minutes); then melt blending is carried out using a twin-screw extruder (length-diameter ratio 40:1, temperature zones: zone 1: 180°C, zone 2: 210°C, zones 3 to 6: 230°C, die head: 225°C), the screw speed is 280 rpm, and vacuum devolatilization (-0.08 MPa) is carried out; then pelletizing and screening are carried out: underwater pelletizer is used to make masterbatch with a diameter of 2 - 3 mm; a vibrating screen (20 mesh) is used to remove oversized particles, and the water content of the finished product < 0.1%; LPET conductive masterbatch is prepared; the dispersibility of the LPET conductive masterbatch is detected by SEM, and the diameter of the carbon black agglomerates ≤ 200 nm; then, thermosensitive conductive fibers are prepared:

[0028] First, the thermosensitive skin layer of the thermosensitive conductive fiber is formulated, and the weight percentage is: LPET conductive masterbatch 35%, general PET chips 65%;

[0029] Then, the polyester core layer of the thermosensitive conductive fiber is formulated: the weight percentage is: general PET chips 100%;

[0030] Then, skin-core composite fiber spinning is carried out. First, the general PET chips are dried in a vacuum rotary drum at 150°C (dew point -40°C); and the thermosensitive skin layer and the thermosensitive polyester core layer are respectively fed into the skin layer screw and the core layer screw for melting. Skin layer screw: the temperature gradually increases from 265°C (zone 1) to 285°C (zone 5);

[0031] Core layer screw: the temperature gradually increases from 275°C (zone 1) to 290°C (zone 5);

[0032] Feed the molten fluid into a composite spinning device, and use a trilobal skin-core spinneret (single-hole diameter 0.20 mm); the skin layer accounts for 30% and the core layer accounts for 70%; after spinning, cool and form the fiber filaments: use side blowing with a temperature of 22°C, a humidity of 65%, and a wind speed of 1 m / s; set the fiber fineness to 1.4 D and the spinning speed to 3200 m / min; after cooling, wind with mechanical energy and the winding tension is 0.15 cN / dtex; then, cut the winding to a matching length according to the absorbent fiber, such as cutting the wound composite fiber to 38 mm to obtain thermosensitive conductive fibers; and detect the thermosensitive conductive fibers, and use the section dyeing method to detect the integrity of the skin-core structure, and the thickness ratio of the thermosensitive skin layer is 30±2%; then, blend 65% of the thermosensitive conductive fibers, 20% of the recycled cotton fibers, and the balance as absorbent fibers by weight percentage; when blending, use a multi-bin cotton blender with a blending uniformity of ≥92%, and then card to obtain a base strip; directly spin the base strip, and when spinning, use three doublings (8 roots × 8 roots × 8 roots), with a total draft multiple of 8.2; the output evenness CV value is ≤2.8%; first perform roving: the spindle speed is 1200 rpm and the twist factor is 78; then perform ring spinning: the spindle speed is 16000 rpm and the twist is 680 T / m; the yarn count is 32S and the strength CV value is ≤9.5%; then let it stand for 1 d to eliminate internal stress; at this time, test the yarn spun from the thermosensitive conductive fibers alone; the test environment is: 25°C, 65% RH.

[0033] Initial state: The carbon black is wrapped inside the LPET, and the surface resistance is relatively high (>10^12 Ω); then, conduct a heating test, adjust the iron to the "cotton file" (about 180°C), iron on the yarn surface, and the contact time between the yarn and the iron is 30 s; the LPET melts and carries the carbon black to migrate to the fiber surface; after cooling, the LPET solidifies and forms a continuous conductive film on the yarn surface, and the resistance drops to 10^6 Ω; then conduct a durability test: after 200 washes, the surface resistance is 7.95×10^6; then, iron again according to the above process, and the surface resistance (Ω) is 3.2×10^6; then, wash again until the resistance rises back to 10^8 Ω, and then iron again, and perform reciprocating cyclic operations. The number of times of electrostatic repair (to make the resistance ≤10^7 Ω) can reach 192 times; and after each ironing, compared with the previous ironing, the resistance recovery rate is ≤10%; when the number of ironing times reaches 192 times, the strength loss rate is 8%, which can meet the application requirements.

[0034] Example 2:

[0035] A long-lasting conductive coating is processed on the surface of the conductive fiber sliver. The sliver is obtained according to the sliver processing procedure of Example 1. At the same time, in the sliver processing procedure of Example 1, the recycled cotton fiber is removed to obtain the first comparative sliver, and in the processing procedure of Example 1, the absorbent fiber in the sliver is removed to obtain the second comparative sliver, and in the processing procedure of Example 1, the recycled cotton fiber and the absorbent fiber in the sliver are removed to obtain the third comparative sliver. Then, the sliver, the first comparative sliver, the second comparative sliver, and the third comparative sliver are all put into an impregnation device and fully impregnated with the long-lasting conductive coating solution. The impregnation time is 10 - 20 min. Then, the excess liquid is removed by centrifugation and dried and cured at 85°C. The weight percentage of the components in the long-lasting conductive coating solution is as follows: 65% of the conductive agent, 5% of the dispersant (anhydrous ethanol), and the balance is the bonding enhancer. The weight percentage of the components of the conductive agent is 80% of sodium dodecyl sulfonate, and the balance is graphene powder. The weight percentage of the components of the bonding enhancer is 45% of p-methoxysalicylaldehyde, and the balance is 3,4-dimethoxyphenylacetonitrile.

[0036] Then, according to the process of Example 1, the sliver, the first comparative sliver, the second comparative sliver, and the third comparative sliver are spun to prepare four groups of yarn samples, and the resistance tests are respectively carried out. When the resistance ≤ 10^7 Ω is required, the sliver allows more than 500 washing times, the first comparative sliver allows 390 washing times, the second comparative sliver allows 212 washing times, and the third comparative sliver allows 62 washing times. As can be seen from the above, when a long-lasting conductive coating is processed alone on the surface of the thermosensitive conductive fiber, the anti-peeling ability of the processed long-lasting conductive coating is general. When recycled cotton fiber or absorbent fiber is used in combination with the thermosensitive conductive fiber, the anti-peeling ability can increase exponentially. When the sliver production process is used for processing, a stable conductive network can be formed. At this time, the long-lasting conductive effect of the entire conductive fiber sliver is the best.

[0037] For the sliver loaded with the long-lasting conductive coating, when blended yarn is made according to Example 1, the initial state: the surface resistance of the yarn (less than 10^6 Ω); then, the yarn is washed, and the number of washing times is 500 (during the blended yarn process of the sliver, a small amount of loss occurs in the antistatic effect); when the resistance reaches 1.1×10^8 Ω, then the contact time between the yarn and the iron is 1 min; the resistance drops to 4.1×10^6 Ω; and it is tested according to the durability test process of Example 1: the number of times of static electricity repair (to make the resistance ≤ 10^7 Ω) can reach 212 times; the increase in the number of times may be due to the residual conductive agent and the conjugated long chain being destroyed by heat and reconstructed to form a new conjugated long chain.

[0038] Example 3:

[0039] Send 50% recycled cotton fiber, 35% virgin cotton fiber, and the balance moisture-wicking fiber into the FA002 type bale opener → A006C type mixing machine → A036C type porcupine opener → A092A type double-lattice feeder → A076C type single-delivery coiler → FA201 type carding machine to obtain moisture-wicking fiber sliver.

[0040] Send 45% of the base strip with a long-lasting conductive coating prepared in Example 2, 55% of the above-mentioned moisture-wicking fiber sliver, and the balance bamboo charcoal fiber sliver into the FA305 type draw frame for drawing in sequence, and then send it to the FA425 type roving frame to obtain polyester roving. Then send the polyester roving to the FA506 type spinning frame to obtain recycled blended cotton yarn; among them, the initial state of the recycled blended cotton yarn: the surface resistance of the yarn (less than 10^7 Ω); and after 500 washes, when the resistance reaches 7.6×10^8 Ω after washing, then keep the contact time between the yarn and the iron for 1 min; the resistance drops to 7.1×10^6 Ω; and test according to the durability test process of Example 1: the number of times of electrostatic repair (to make the resistance ≤ 10^7 Ω) can reach 178 times, and the contact time between the yarn and the heating surface of the iron is 1.5 min.

[0041] The above embodiments are only the preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made according to the structures, features, and principles described in the scope of the present invention application are included in the scope of the present invention application.

Claims

1. A regenerated blended cotton yarn, characterized in that: It includes 30 - 45% of conductive fiber sliver, 45 - 55% of sweat-absorbing and moisture-wicking fiber sliver, and the balance is functional fiber sliver; the weight percentages of the components in the conductive fiber sliver are: recycled cotton fiber 20 - 25%, thermosensitive conductive fiber 60 - 65%, and the balance is absorbent fiber; a long-lasting conductive coating is provided on the surface of the conductive fiber sliver; the thermosensitive conductive fiber has a core-shell structure composed of a thermosensitive cortex and a polyester core layer, and the weight percentages of the components in the sweat-absorbing and moisture-wicking fiber sliver are: recycled cotton fiber 45 - 50%, raw cotton fiber 35 - 40%, and the balance is moisture-absorbing and sweat-wicking fiber; The weight percentages of the components in the thermosensitive cortex of the thermosensitive conductive fiber are LPET conductive masterbatch 30 - 35%, and the balance is general polyester; the polyester core layer of the thermosensitive conductive fiber is made of general polyester; the thermosensitive cortex and the polyester core layer of the thermosensitive conductive fiber are each melted by a screw and spun and cooled into shape through a composite spinning device to obtain a composite fiber filament, and then the composite fiber filament is cut to match its length with that of the viscose fiber; The processing process of the long-lasting conductive coating is as follows: the conductive fiber sliver is impregnated in the long-lasting conductive coating solution, and then, the excess liquid is removed by centrifugation and dried and cured at 80 - 100 °C; the weight percentage of the components in the long-lasting conductive coating solution is: conductive agent 65 - 70%, and the balance is bonding enhancer, the weight percentage of the components of the conductive agent is sodium dodecyl sulfonate 70 - 85%, and the balance is graphene powder, and the weight percentage of the components of the bonding enhancer is p-methoxysalicylaldehyde 40 - 45%, and the balance is 3,4-dimethoxyphenylacetonitrile.

2. The regenerated blended cotton yarn according to claim 1, wherein: The functional fiber sliver is one of bamboo charcoal fiber, fluorescent whitening polyester fiber, and polyester cool fiber.

3. The regenerated blended cotton yarn according to claim 1, wherein: The absorbent fiber is viscose fiber or moisture-absorbing and sweat-wicking fiber.

4. A production process for regenerated blended cotton yarn, which is used to produce the regenerated blended cotton yarn described in any one of claims 1 to 3, is characterized in that, The production process is: the conductive fiber sliver, the sweat-absorbing and moisture-wicking fiber sliver, and the functional fiber sliver are separately processed in the opening and cleaning process and the carding process, and then mixed in the drawing process to obtain a recycled blended cotton yarn.

5. The production process of the regenerated blended cotton yarn according to claim 4, characterized in that: When mixing in the drawing process, the number ratio of the conductive fiber sliver, the sweat-absorbing and moisture-wicking fiber sliver, and the functional fiber sliver is: 3:3:

1.

6. The production process of the regenerated blended cotton yarn according to claim 4, characterized in that: The processing process of the conductive fiber sliver is specifically as follows: the recycled cotton fiber, the thermosensitive conductive fiber, and the absorbent fiber are blended and cleaned by a multi-bin mixer, and then carded to obtain a base sliver; and the base sliver is sent into an impregnation device and impregnated for 10 - 20 min, and the long-lasting conductive coating solution is poured into the impregnation device; then, it is pulled out at a constant speed and dried through a hot air oven to obtain the conductive fiber sliver.