Wear-resistant machine-washable wool and chinlon blended fabric and preparation method thereof

Abstract

The invention discloses a wear-resistant machine-washable wool and chinlon blended fabric and a preparation method thereof, and aims to solve the problems of poor machine-washable stability, easiness in fuzzing and pilling and interface slippage of conventional blended fabrics. The fabric is of a core-sheath type plying structure, a core layer is made of bio-based chinlon filaments, a sheath layer is made of refined wool staple fiber and chinlon staple fiber blended yarn, and the fabric is formed through compact siro spinning; a temperature-sensitive composite finishing agent with a low critical solution temperature of 32 DEG C is synchronously fixed through a double-stage process of Z-twist 180-220 T / M pre-twist and 120-130 DEG C high-temperature twist setting, so that intelligent hydrophilic and hydrophobic switching is realized; and dopamine-alanine composite grafting and citric acid-chitosan cross-linking are combined to strengthen an interface. The fuzzing and pilling grade of the fabric is 4.5 grade, the Martindale wear resistance is 25000-30000 times, the strength retention rate after 30 times of machine washing is 88-92%, the fiber slip rate is 2-3%, and the fabric has the characteristics of skin friendliness and high strength, is adaptive to existing equipment, and is wide in application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile fabrics, in particular to a wear-resistant machine-washable wool-polyamide blended fabric and a preparation method thereof. BACKGROUND

[0002] Wool fabric has become a high-end textile material due to its skin-friendly and breathable properties and good warmth retention. However, pure wool fabric has poor wear resistance and is prone to felting, and fiber slippage is serious after washing, which limits its application in machine-washable scenarios. To improve performance, the industry often uses wool-polyamide blending technology to improve the wear resistance of the fabric by using the high strength of polyamide. However, the interfacial compatibility of wool and polyamide is poor, and after blending, there are still problems such as weak fiber bonding, pilling after washing, and strength reduction. Existing technologies often use a single finishing agent or simple cross-linking treatment to optimize the interfacial bonding, which can improve the wear resistance to some extent, but it is difficult to balance machine-washability and intelligent functionality. At the same time, traditional blended fabrics lack environmental response capability and cannot adjust hydrophilicity and hydrophobicity according to temperature changes, making it difficult to meet consumers' dual demands for comfort and multi-functionality. Therefore, it is a technical problem to be solved in the textile field to develop a wool-polyamide blended fabric that has excellent wear resistance, machine-washable stability, and temperature-responsive functionality through the synergistic effect of interfacial reinforcement and functional finishing. SUMMARY

[0003] To solve the above technical problems, the present application provides a wear-resistant machine-washable wool-polyamide blended fabric and a preparation method thereof. The fabric adopts a core-sheath type plying structure and has excellent wear resistance, machine-washable stability, and temperature-responsive functionality through the synergistic effect of dopamine-alanine composite graft modification, citric acid-chitosan interfacial cross-linking, and temperature-sensitive composite finishing agent. It also retains the skin-friendly and breathable properties of wool and the high strength advantage of polyamide, effectively solving the problems of weak fiber bonding, deformation after washing, and single functionality of traditional blended fabrics, and meeting the application needs of high-end clothing, home textiles, and outdoor clothing in multiple scenarios.

[0004] To achieve the above purposes, the present application adopts the following technical solutions: A wear-resistant machine-washable wool-polyamide blended fabric is prepared from the following raw materials by weight: 40-60 parts of bio-based polyamide filaments, 60-80 parts of refined wool short fibers, 0.1-0.3 parts of composite grafting agent composed of 0.075-0.225 parts of dopamine and 0.025-0.075 parts of alanine, 4-7 parts of composite finishing agent composed of 3-5 parts of temperature-sensitive polyurethane and 1-2 parts of poly-N-isopropyl acrylamide microgel, 2-4 parts of citric acid, 1-2 parts of chitosan, and 180-220 parts of deionized water; The fabric adopts a core sheath type plying structure, the core layer is one bio-based polyamide filament with a specification of 40D / 12F-70D / 24F, the sheath layer is one blended yarn blended from refined wool short fibers with a diameter of 16-18 μm and the short fibers of the bio-based polyamide filament, the plying structure is formed by the core layer filament and the sheath layer blended yarn through a compact siro spinning process, and the plying twist is Z twist 180-220 T / M; the surface of the refined wool short fibers is grafted with the dopamine biomimetic peptide, and the wool-polyamide interface is cross-linked and strengthened by a cross-linking agent composed of citric acid and chitosan with a mass ratio of 1:1-3:1, and the fabric is treated with a composite finishing agent of temperature-sensitive polyurethane and poly-N-isopropyl acrylamide microgel, and the low critical solution temperature of the composite finishing agent is 32℃.

[0005] Preferably, the grafting conditions of the dopamine biomimetic peptide are: pH 8.5-9.0, temperature 40℃, time 30-40 min.

[0006] Preferably, the fixing and cross-linking reactions of the composite finishing agent are carried out synchronously, and the specific conditions are: high temperature setting twist for 20 min at 120-130℃, synchronous completion of finishing agent fixing and interface cross-linking, and the interface peel strength of the fabric after cross-linking is 6.5-10.0 N / m.

[0007] Preferably, the performance indicators of the fabric are: a pilling level of 4.5, a Martindale abrasion resistance of 25000-30000 times, a bursting strength retention rate after 30 machine washes of 88%-92%, a fiber slippage rate of 2%-3%, and a water washing dimensional change rate of ±1.5%.

[0008] Preferably, the preparation steps of the abrasion-resistant machine-washable wool-polyamide blended fabric are as follows: S1, refined wool short fibers, a composite grafting agent, and deionized water are weighed, the composite grafting agent is completely dissolved in deionized water to prepare a composite aqueous solution with a mass concentration of 0.1%-0.3%, then the refined wool short fibers are immersed in the aqueous solution, and the grafting treatment is completed under the conditions of pH 8.5-9.0 and 40℃ for 30-40 min, and then the wool short fibers are washed to neutral with deionized water for standby; S2, bio-based polyamide filaments are weighed, 20%-30% of the bio-based polyamide filaments are cut into short fibers with a length of 38-51 mm, and then the refined wool short fibers treated in S1 and the short fibers are uniformly mixed to spin the sheath layer blended yarn; S3, one bio-based polyamide filament which is not cut is used as the core layer, and is plied with one sheath layer blended yarn prepared in S2 through a compact siro spinning process, and the twist is set to Z twist 180-220 T / M to obtain a core sheath plying yarn; S4, the mass concentration of 4%-7% of the composite finishing agent is prepared by taking 3-5 parts of temperature-sensitive polyurethane and poly N-isopropyl acrylamide microgel by weight parts, dispersing in the remaining deionized water, and stirring uniformly; and taking citric acid and chitosan by weight parts, adding an appropriate amount of deionized water after mixing, stirring and dissolving to prepare a crosslinking agent with a concentration of 5%, the mass ratio of citric acid to chitosan being 1:1-3:1; S5, the core sheath ply yarn is pre-twisted at room temperature, the pre-twist degree is 50-80 T / M, and then high temperature setting is performed at 120-130℃ for 20 min, and the crosslinking agent is sprayed on the surface of the core sheath ply yarn at the same time, the spraying amount being 100-150 g / m 2 Meanwhile, the interface crosslinking and temperature-sensitive finishing are simultaneously completed by high-temperature fixing of the composite finishing agent; S6, the fabric treated by the above treatment is subjected to conventional finishing, including washing: washing with deionized water at room temperature, bath ratio 1:20-1:30, washing time 10-15 min, rotation speed 80-100 rpm; drying: the fabric after washing is put into a hot air drying machine, the drying temperature is set to 60-80℃, the air speed is 2-3 m / s, the drying time is 20-30 min, and the moisture content of the fabric is 3%-8%; setting: the dried fabric is sent into a heat setting machine, the setting temperature is set to 110-120℃, the tension is 20-30 N, and the setting time is 30-60 s, and the fabric is naturally cooled to room temperature after setting to obtain the final product.

[0009] Preferably, the breaking strength of the bio-based nylon filament is 5.0-7.0 cN / dtex, the breaking elongation is 25%-35%, the bio-based content is 50%-80%, and the single filament fineness is 1.0-1.5 dtex.

[0010] Preferably, the mass concentration of the composite finishing agent is 4%-7%, the temperature-sensitive polyurethane and poly N-isopropyl acrylamide microgel are uniformly dispersed in the finishing agent, the dispersion particle size is 1-5 μm, and the Zeta potential is-20 mV to-35 mV.

[0011] Preferably, the contact angle of the fabric at 25℃ is 50°-60°, the contact angle at 35℃ is 95°-120°, and the temperature-sensitive response switching time is 10-35 s.

[0012] With the technical scheme, the application has the advantages that the wear-resistant machine-washable wool-polyamide blended fabric prepared by the application has excellent comprehensive performance, the number of Martin's wear is 25000-30000 times, the bursting strength retention rate is 88%-92% after 30 times of machine washing, the fiber slip rate is only 2%-3%, effectively solving the problems of poor wear resistance and easy deformation of traditional blended fabrics; the hydrophilic-hydrophobic intelligent switching can be realized at 25-35 DEG C, the response time is less than or equal to 35s, and the cycle stability is good; through the synergistic effect of dopamine-alanine composite grafting and citric acid-chitosan crosslinking, the interfacial peeling strength is 6.5-10.0 N / m, the core-sheath structure is combined firmly, the advantages of wool skin-friendly and breathable and polyamide high strength are retained, and the fabric has weather resistance and environmental protection, and is suitable for high-grade clothes, home textiles and outdoor clothing and other scenes. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, illustrate the application, and are used to explain the application, and do not constitute a limitation on the application.

[0014] Figure 1 The figure is a schematic diagram of the yarn structure of the application; Figure 2 The figure is a circular sample diagram of the blended fabric of the application. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the application more clear, the technical scheme in the embodiments of the application will be clearly and completely described below. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0016] Embodiment 1 The wear-resistant machine-washable wool-polyamide blended fabric of the embodiment 1 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filaments, 70 parts of refined wool short fibers, 0.2 parts of composite grafting agent composed of 0.15 parts of dopamine and 0.05 parts of alanine, 5 parts of composite finishing agent composed of 4 parts of temperature-sensitive polyurethane and 1 part of poly-N-isopropyl acrylamide microgel, 3 parts of citric acid, 2 parts of chitosan, and 200 parts of deionized water; The preparation steps of the poly-N-isopropyl acrylamide microgel are as follows: S1, 100 mL of deionized water is added to a three-necked flask, and nitrogen is introduced for 30 min to exclude oxygen; then N-isopropyl acrylamide monomer and N,N'-methylene bisacrylamide crosslinking agent are added, stirred until completely dissolved, and a uniform reaction solution is formed; S2, the reaction solution is warmed to 70°C, and an initiator solution containing ammonium persulfate is quickly added, and the reaction is continuously stirred for 6 h; after the reaction is completed, it is cooled to room temperature, washed by centrifugation at 8000 rpm for 3 times, and dispersed by ultrasonic to obtain a poly-N-isopropyl acrylamide microgel dispersion with a solid content of about 2% and a particle size of 1-5 μm.

[0017] The preparation method of the wear-resistant machine-washable wool-polyamide blended fabric in this embodiment is as follows: S1, deionized water, dopamine and alanine are mixed, stirred at room temperature for 15 min, and prepared into a 0.17% concentration solution; the wool staple is immersed in the above solution, the pH is adjusted to 8.8 with 0.1 mol / L NaOH, and the reaction is carried out at 40°C water bath for 35 min (stirring every 10 min), the grafting treatment is completed, and then it is washed with deionized water to neutral for standby; S2, take 25% of the bio-based polyamide filament, cut it into 45 mm long short fibers and screen out unqualified products for standby, then put the wool short fibers modified by S1 together with the polyamide short fibers into the opener to open and mix evenly, then go through the processes of carding, drawing, roving and spinning to spin the sheath blended yarn with a twist of 300 T / M, and finally remove the unqualified yarns such as uneven thickness and more broken ends for standby; S3, the remaining bio-based polyamide filament is used as a single core layer, and 1 sheath blended yarn prepared by S2 is used as a sheath layer, which are matched together and sent into a compact siro spinning equipment, and the set ply twist is Z twist 200 T / M, and then the core-sheath structure ply yarn is spun and wound for standby; S4, add temperature-sensitive polyurethane and poly-N-isopropyl acrylamide microgel to deionized water, first stir at high speed for 30 min at a speed of 1200 rpm, then disperse by ultrasonic for 15 min at a power of 300 W, ensure that the dispersion particle size is controlled in 1-5 μm, and prepare a stable composite finishing agent with a mass concentration of 5%; Add citric acid and chitosan (mass ratio 1.5:1) to deionized water, stir at 50°C for 20 min until completely dissolved, and prepare a 5% mass concentration of citric acid-chitosan crosslinking agent; S5, the core-sheath ply yarn is pre-twisted at room temperature, and the pre-twist is set to 70 T / M, then sent into a high temperature setting device, and set at 125°C for 20 min, and the crosslinking agent (spraying amount 120 g / m 2 ) and the composite finishing agent are sprayed on the surface of the ply yarn at the same time, and the interface crosslinking of wool-polyamide and the fixation of functional finishing agent are completed at the same time in the high temperature environment; S6, the core sheath ply yarn is woven into a gray cloth by a flat knitting machine with plain weave, then is put into an industrial washing machine, washed with deionized water at room temperature according to the parameters of bath ratio 1:25, washing time 12 min, rotation speed 90 rpm, and rinsed once; after washing, the fabric is sent into a hot air drying machine, dried at 70 DEG C, air speed 2 m / s for 25 min until the moisture content of the fabric reaches 5%; finally, the dried fabric is sent into a heat setting machine, set at temperature 115 DEG C, tension 25 N, setting time 45 s, and naturally cooled to room temperature after setting to obtain the finished product.

[0018] Example 2: The wear-resistant machine-washable wool-polyamide blended fabric of this example 2 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filament, 70 parts of refined wool staple, 0.2 parts of composite grafting agent composed of 0.15 parts of dopamine and 0.05 parts of alanine, 5 parts of composite finishing agent composed of 3 parts of temperature-sensitive polyurethane and 2 parts of poly-N-isopropyl acrylamide microgel, 3 parts of citric acid, 2 parts of chitosan, and 200 parts of deionized water; The preparation steps of the poly-N-isopropyl acrylamide microgel are the same as those of example 1. The preparation method of the wear-resistant machine-washable wool-polyamide blended fabric in this example is the same as that of example 1, only the proportion of the composite finishing agent is changed.

[0019] Example 3: The wear-resistant machine-washable wool-polyamide blended fabric of this example 3 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filament, 70 parts of refined wool staple, 0.2 parts of composite grafting agent composed of 0.15 parts of dopamine and 0.05 parts of alanine, 5 parts of composite finishing agent composed of 3 parts of temperature-sensitive polyurethane and 2 parts of poly-N-isopropyl acrylamide microgel, 3 parts of citric acid, 2 parts of chitosan, and 200 parts of deionized water; The preparation steps of the poly-N-isopropyl acrylamide microgel are the same as those of example 1. The preparation method of the wear-resistant machine-washable wool-polyamide blended fabric in this example is the same as that of example 1, only the proportion of the crosslinking agent is changed to citric acid: chitosan = 2:1.

[0020] Example 4: The wear-resistant machine-washable wool-polyamide blended fabric of this example 4 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filament, 70 parts of refined wool staple, 0.2 parts of composite grafting agent composed of 0.15 parts of dopamine and 0.05 parts of alanine, 5 parts of composite finishing agent composed of 3 parts of temperature-sensitive polyurethane and 2 parts of poly-N-isopropyl acrylamide microgel, 3 parts of citric acid, 2 parts of chitosan, and 200 parts of deionized water; The preparation steps of the poly-N-isopropyl acrylamide microgel are the same as those in Example 1. The preparation method of the wear-resistant machine-washable wool-polyamide blended fabric in this example is the same as that in Example 1, only 30% of the bio-based polyamide filaments are cut to prepare polyamide staple fibers, and the remaining 70% are used as core filaments.

[0021] Comparative Example 1 The fabric of this comparative example 1 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filaments, 70 parts of refined wool staple fibers, 0 parts of composite grafting agent composed of 0 parts of dopamine and 0 parts of alanine, 5 parts of composite finishing agent composed of 4 parts of temperature-sensitive polyurethane and 1 part of poly-N-isopropyl acrylamide microgel, 3 parts of citric acid, 2 parts of chitosan, and 200 parts of deionized water; The preparation steps of the poly-N-isopropyl acrylamide microgel are the same as those in Example 1. The preparation method of the fabric in this comparative example is the same as that in Example 1, only dopamine and alanine are not added, and only deionized water is used to soak the wool staple fibers, with a soaking time of 35 min and a temperature of 40°C.

[0022] Comparative Example 2 The fabric of this comparative example 2 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filaments, 70 parts of refined wool staple fibers, 0.2 parts of composite grafting agent composed of 0.15 parts of dopamine and 0.05 parts of alanine, 5 parts of composite finishing agent composed of 4 parts of temperature-sensitive polyurethane and 1 part of poly-N-isopropyl acrylamide microgel, 0 parts of citric acid, 0 parts of chitosan, and 200 parts of deionized water; The preparation steps of the poly-N-isopropyl acrylamide microgel are the same as those in Example 1. The preparation method of the fabric in this comparative example is the same as that in Example 1, only the citric acid-chitosan crosslinking agent is not prepared, and only the composite finishing agent is sprayed in step S5.

[0023] Comparative Example 3 The fabric of this comparative example 3 is prepared from the following raw materials by weight: 50 parts of bio-based polyamide filaments, 70 parts of refined wool staple fibers, 0.2 parts of composite grafting agent composed of 0.15 parts of dopamine and 0.05 parts of alanine, 0 parts of composite finishing agent composed of 0 parts of temperature-sensitive polyurethane and 0 parts of poly-N-isopropyl acrylamide microgel, 3 parts of citric acid, 2 parts of chitosan, and 200 parts of deionized water; The preparation method of the fabric in this comparative example is the same as that in Example 1, only the temperature-sensitive polyurethane and the poly-N-isopropyl acrylamide microgel are not added.

[0024] Performance Test 1. Abrasion resistance test The abrasion resistance test was performed according to the GB / T 21196-2007 standard. Three 140 mm x 140 mm square samples (avoiding seams and defects) were cut from different finished fabrics and a blank control fabric (traditional blended fabric) and equilibrated in an environment with a temperature of 20 ± 2°C and a humidity of 65 ± 4% for 24 h. The Martindale abrasion tester was calibrated, and the samples and abrasives (standard wool felt) were installed. The load was set to 49 N (standard working conditions), and the instrument was started for reciprocating friction testing. During the test, the sample surface state was observed every 5000 times, and the cumulative friction number was recorded when the fabric reached level 3 (rated according to GB / T 4802.1-2008) in terms of obvious damage or pilling. The average of the test results of the three samples was taken as the final abrasion resistance of the sample.

[0025] Table 1. Test data table for abrasion resistance test of different samples

[0026] The average abrasion resistance of the examples was 26500-29000 times, which was 4.0%-81.2% higher than that of the comparative examples and 115.0%-135.1% higher than that of the traditional fabric. Among them, example 3 had the best performance (29000 times), and comparative example 2 (without interface crosslinking) had the worst performance (16000 times), proving that "composite grafting and interface crosslinking" was the core synergistic effect of improving abrasion resistance, and the temperature-sensitive finishing had no negative impact on abrasion resistance.

[0027] 2. Machine washable stability test Six 100 mm diameter circular samples were cut from the finished fabric, three of which were directly used for initial bursting strength testing, and the other three were used for post-washing testing. The initial bursting strength was tested according to the GB / T 19976-2005 standard using a bursting strength tester (steel ball diameter 25 mm, pressure head speed 50 mm / min), and the average value was taken as the pre-washing strength. The remaining three samples were placed in a standard washing bag, and the washing machine parameters were set according to the "5A washing program" (water temperature 40 ± 2°C, washing time 30 min, rotation speed 1000 rpm, and standard detergent was added). The washing was repeated 30 times, and after each washing, the samples were dried according to the "hanging drying" method specified in GB / T 8629-2017. After washing and drying, the samples were equilibrated in the same environmental conditions for 24 h, and the bursting strength was tested in the same way. The average value was taken as the post-washing strength. The bursting strength retention rate was calculated (bursting strength retention rate = post-washing strength / pre-washing strength x 100%).

[0028] Table 2. Test data table for machine washable stability of different samples

[0029] The breaking strength retention rate of the embodiment is 88.0%-91.0%, which is significantly higher than that of the comparative examples and the traditional fabric. Embodiment 3 also performs best, and comparative example 2 is the lowest. It shows that the interface crosslinking can firmly lock the fiber structure and avoid the loss of strength after washing. The composite graft modification further optimizes the fiber compatibility, and both of them solve the pain point of traditional blended fabric "easy to lose after washing".

[0030] 3. Temperature-sensitive hydrophilic and hydrophobic response test According to the standard GB / T 30693-2014 standard, 3 pieces of 50 mm x 50 mm samples are cut from the finished fabric, and are fixed on the sample table. In an environment with a temperature of 20±2℃ and a humidity of 65±4%, the sample is balanced for 12 hours. The contact angle measuring instrument is calibrated, the sample table is placed in the instrument, the environmental temperature is set to 25℃ (normal temperature), and after the temperature is stable, 5 μL of deionized water is added to the sample surface with a micro-syringe. After standing for 10 seconds, the contact angle image is photographed, and the static contact angle is calculated by software. Repeat the test at 3 different positions and take the average value. The instrument environmental temperature is raised to 35℃ (near human comfortable temperature), and after constant temperature for 30 minutes, deionized water is added in the same way. The value (standing for 10 seconds) and response time (from the temperature rising to 35℃ to the contact angle stable time) of the contact angle when stable are recorded. The same test is repeated 3 times to take the average value. The difference between the contact angles at 25℃ and 35℃ is calculated.

[0031] Table 3. Temperature-sensitive hydrophilic and hydrophobic response test data table of different samples

[0032] All embodiments show obvious intelligent switching (contact angle change difference 50.0°-57.0°, response time 27-32s), 25℃ hydrophilic (53°-56°) suitable for daily wear, and 35℃ hydrophobic (105°-110°) can reduce sweat adhesion. The contact angle change of comparative examples and traditional fabric is ≤3°, and there is no temperature-sensitive response. It is verified that the composite finishing system of "temperature-sensitive polyurethane and poly-N-isopropyl acrylamide" is the only key to realize the intelligent switching of hydrophilic and hydrophobic, and there is no conflict with the grafting and crosslinking process.

[0033] 4. Structure stability test (1) Fiber slip rate test According to the standard GB / T 13772.2-2018 standard, cut 3 pieces of 150 mm x 50 mm samples from the finished fabric, take 1 piece in the warp direction and 1 piece in the weft direction (the 3rd piece is a spare), sew a straight line joint with a length of 100 mm in the middle of the sample (needle spacing 3 needles / cm), joint width 10 mm; calibrate the tensile testing machine, fix the two ends of the sample on the clamp, make the joint at the center position of the clamp, set the tension to 100 N, keep for 1 min; after unloading, measure the fiber slip distance (the maximum displacement in the joint direction) at the joint with a vernier caliper, calculate the slip rate (slip rate = slip distance / joint length x 100%); repeat the test for 3 samples, take the average value as the final result.

[0034] Table 4 Fiber slip rate test data table of different samples

[0035] The slip rate of the example is 2.1%-2.4%, which is much lower than that of the comparative examples (3.0%-5.2%) and the traditional fabric (6.4%), and the slip rate of example 3 (2.1%) is reduced by 59.6% compared with comparative example 2 (5.2%), which shows that the interfacial crosslinking can effectively inhibit the fiber slip at the joint, and the design of "sheath layer blending and core layer filament" of the core-sheath structure further strengthens the structural stability, even if the proportion of nylon staple fiber is increased (example 4), the slip rate is still controlled at a low level.

[0036] (2) Interfacial peel strength test According to the standard GB / T 2791-1995 standard, cut 3 pieces of 200 mm long yarn from the core-sheath ply yarn of different samples, carefully separate the core layer (biobased nylon filament) and the sheath layer (blended yarn) from one end by 50 mm to form a T-shaped peeling sample; calibrate the peeling tester, fix the core layer end of the sample on the upper clamp and the sheath layer end on the lower clamp, make sure the sample is vertical without twisting, set the tensile speed to 50 mm / min; start the instrument to test the T-shaped peeling, record the force-displacement curve during the peeling process, take the average force of the stable section as the peeling force, divide by the sample width (the equivalent width corresponding to the yarn diameter, calculated according to the actual measured value), get the interfacial peel strength; repeat the test for 3 samples, take the average value as the final result.

[0037] Table 5 Interfacial peel strength test data table of different samples

[0038] The average peel strength of the embodiments is 8.0-9.0 N / m, which is increased by 14.3%-136.8% compared with the comparative examples (3.8-7.0 N / m) and by 142.4%-172.7% compared with the traditional fabric (3.3 N / m). The peel strength of embodiment 3 (9.0 N / m) is increased by 136.8% compared with comparative example 2 (3.8 N / m), which directly proves that the composite grafting improves the compatibility of fibers and the formation of chemical bonds by citric acid-chitosan crosslinking, and the double action greatly improves the interfacial bonding force of the core-sheath structure, which is the core guarantee of structural stability.

[0039] 5. Skin-friendly performance test (1) Skin irritation test: cut 3 samples of 50 mm x 50 mm, after sterile treatment, use the closed patch test method, select 10 healthy volunteers (without skin diseases), paste the sample on the inner side of the volunteer's forearm, fix it with medical tape, take it off after 24 h of continuous wearing, observe and record the skin irritation reaction such as redness, itching, stinging, etc. within 48 h, and determine the irritation grade according to the standard (0 grade for no irritation); (2) Odor test: cut 1 sample of 100 mm x 100 mm, put it in a sealed 500 mL wide-mouth bottle, and incubate it in an oven at 60±2℃ for 24 h, then cool it to room temperature, and evaluate it by 3 trained evaluators according to the standard (1 grade for no odor, 2 grade for slight odor, 3 grade for obvious odor, 4 grade for strong odor, 5 grade for pungent odor), and take the average of the 3 evaluators as the final odor grade.

[0040] Table 6 Skin-friendly performance test data table of different samples

[0041] The embodiments are all 0 grade without irritation (no redness / itching), and the average odor grade is 1.0-1.3 grade (no odor / slight odor); comparative examples 1 and 2 and the traditional fabric have 1 grade of slight irritation (2-4 cases of itching), and the odor grade is 2.0-2.3 grade (obvious odor). The reason is that the composite grafting modification reduces the irritating groups on the surface of the wool, and the interfacial crosslinking reduces the residual finishing agent. The process of the application considers both function and skin-friendliness, and the temperature-sensitive finishing agent is environmentally friendly and odorless.

[0042] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wear resistant machine washable wool-polyamide blended fabric, characterized in that, The fabric is prepared from the following raw materials by weight parts: biobased polyamide filament 40-60 parts, refined wool staple 60-80 parts, composite grafting agent 0.1-0.3 parts, composed of dopamine 0.075-0.225 parts and alanine 0.025-0.075 parts, composite finishing agent 4-7 parts, composed of temperature-sensitive polyurethane 3-5 parts and poly N-isopropyl acrylamide microgel 1-2 parts, citric acid 2-4 parts, chitosan 1-2 parts, deionized water 180-220 parts; The fabric adopts a core sheath type plying structure, the core layer is 1 biobased polyamide filament with a specification of 40D / 12F-70D / 24F, the sheath layer is 1 mixed yarn spun from refined wool staple with a diameter of 16-18 μm and the staple of the biobased polyamide filament, the plying structure is formed by the core layer filament and the sheath layer mixed yarn through a compact siro spinning process, and the plying twist is Z twist 180-220 T / M; the surface of the refined wool staple is grafted with the dopamine biomimetic peptide, and the wool-polyamide interface is crosslinked and strengthened by a crosslinking agent composed of citric acid and chitosan at a mass ratio of 1:1-3:1, and at the same time, the fabric is treated with a composite finishing agent of temperature-sensitive polyurethane and poly N-isopropyl acrylamide microgel, and the low critical solution temperature of the composite finishing agent is 32℃.

2. A wear resistant machine washable wool-polyamide blended fabric according to claim 1, characterized in that, The grafting conditions of the dopamine biomimetic peptide are: pH 8.5-9.0, temperature 40℃, time 30-40 min.

3. A wear resistant machine washable wool-polyamide blended fabric according to claim 1, characterized in that, The fixing and crosslinking reactions of the composite finishing agent are carried out synchronously, and the specific conditions are: high temperature setting twist at 120-130℃ for 20 min, synchronous completion of finishing agent fixing and interface crosslinking, and the interface peel strength of the fabric after crosslinking is 6.5-10.0 N / m.

4. A machine washable, abrasion resistant wool-polyamide blended fabric according to claim 1, wherein, The performance indicators of the fabric are: wool and pilling grade 4.5, Martindale abrasion resistance 25000-30000 times, bursting strength retention rate after 30 times of machine washing 88%-92%, fiber slip rate 2%-3%, and water washing size change rate ±1.5%.

5. A wear-resistant, machine-washable wool-nylon blended fabric according to any one of claims 1-4, characterized in that, The specific preparation steps are: S1, refined wool staple, composite grafting agent and deionized water are weighed according to weight parts, the composite grafting agent is completely dissolved in deionized water to prepare a composite aqueous solution with a mass concentration of 0.1%-0.3%, then the refined wool staple is immersed in the aqueous solution, and the grafting treatment is completed under the conditions of pH 8.5-9.0 and 40℃ for 30-40 min, and then washed with deionized water to neutral, ready for use; S2, biobased polyamide filament is weighed according to weight parts, 20%-30% of the biobased polyamide filament is cut into staple with a length of 38-51 mm, mixed uniformly with all the refined wool staple treated in S1, and spun into sheath layer mixed yarn; S3, using compact siro spinning process, the remaining one biobased polyamide filament is used as the core layer, and is plied with one sheath layer mixed yarn prepared in S2, and the twist is set to Z twist 180-220 T / M to obtain core sheath plying yarn. S4, the mass concentration of the composite finishing agent is 4%-7%, the temperature-sensitive polyurethane and the poly N-isopropyl acrylamide microgel are uniformly dispersed in the finishing agent, the dispersed particle size is 1-5 mu m, and the Zeta potential is-20 mV to-35 mV. S5, pre-twist the core-sheath ply yarn at room temperature, the pre-twist degree is 50-80 T / M, then high temperature set twist for 20 min at 120-130 ℃, and spray the cross-linking agent on the surface of the core-sheath ply yarn at the same time, the spraying amount is 100-150 g / m 2 At the same time, through the high-temperature fixing composite finishing agent, the interface cross-linking and the temperature-sensitive finishing are completed synchronously. S6, the fabric treated by the above treatment is subjected to conventional finishing, including washing: using normal temperature deionized water for washing, bath ratio 1:20-1:30, washing time 10-15 min, rotation speed 80-100 rpm; Drying: the fabric washed is placed into a hot air drying machine, the drying temperature is set to 60-80 DEG C, the air speed is 2-3 m / s, the drying time is 20-30 min, and the water content of the fabric is 3%-8%; setting: the dried fabric is sent into a heat setting machine, the setting temperature is set to 110-120 DEG C, the tension is 20-30 N, the setting time is 30-60 s, and the fabric is naturally cooled to room temperature after setting to obtain the final product.

6. A machine washable, abrasion resistant, wool-polyamide blended fabric as claimed in claim 1, wherein, The breaking strength of the bio-based polyamide filament is 5.0-7.0 cN / dtex, the elongation at break is 25%-35%, the bio-based content is 50%-80%, and the single filament fineness is 1.0-1.5 dtex.

7. A machine washable, abrasion resistant, wool-polyamide blended fabric as claimed in claim 1, wherein, The mass concentration of the composite finishing agent is 4%-7%, the temperature-sensitive polyurethane and the poly N-isopropyl acrylamide microgel are uniformly dispersed in the finishing agent, the dispersed particle size is 1-5 mu m, and the Zeta potential is-20 mV to-35 mV.

8. A machine washable, abrasion resistant, wool-polyamide blended fabric as claimed in claim 1, wherein, The contact angle of the fabric at 25 DEG C is 50 DEG-60 DEG, the contact angle at 35 DEG C is 95 DEG-120 DEG, and the temperature-sensitive response switching time is 10-35 s.

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