Preparation process of air-permeable wear-resistant aviation worsted wool-polyester yarn

Abstract

The application relates to a preparation process of air-permeable wear-resistant aviation worsted wool-polyester yarn and relates to the field of wool and polyester worsted knitting blended yarns, and comprises the following steps: (1) selecting wool and certified GRS original color circular cross-section polyester with a mass ratio of (2.5-3.5):(6.5-7.5); (2) carrying out dyeing treatment on the wool to obtain dyed sliver; (3) mixing the dyed sliver and the polyester for 3-5 times, and obtaining combed sliver after combing; (4) carrying out five needle combing, roving, spinning, bobbin winding, oiling on the bobbin, waxing on the doubling, doubling and twisting and yarn steaming treatment on the combed sliver to obtain the air-permeable wear-resistant aviation worsted wool-polyester yarn. The application has the effects of improving the ultraviolet resistance, tear resistance and wear resistance of the wool-polyester yarn.

Description

Technical Field

[0001] This application relates to the field of wool and polyester worsted knitted blended yarns, and in particular to a process for preparing a breathable and wear-resistant aerospace worsted wool-polyester yarn. Background Technology

[0002] In the aerospace field, specialty textile materials are widely used. These materials have complex structures and forms, ranging from one-dimensional filaments to two-dimensional threads, ropes, and ribbons, as well as fabrics and silks woven from silk and threads. They exhibit differences in morphology, dimensions, scale, and composition, forming a vast family of materials. Due to the special nature of the aerospace field, the requirements for all its products are extremely stringent. High standards and specifications exist for mechanical properties (such as breaking strength, tear strength, bursting strength, and abrasion resistance), antistatic properties, breathability, flammability, and color fastness. Furthermore, the fabric surface must be smooth and free of any foreign matter woven into it.

[0003] With the improvement of living standards and the popularization of green, environmentally friendly, and nature-oriented concepts, the demand for natural fiber fabrics for aircraft seats is gradually increasing. Wool fiber, with its excellent antibacterial, odor-resistant, flame-retardant, biodegradable, breathable, moisture-wicking, antistatic, lightfastness, abrasion-resistant, and elastic properties, has once again attracted attention. Worsted wool-polyester yarn retains the excellent characteristics of wool as a natural fiber, while also possessing the advantages of synthetic polyester fiber, such as high tear strength, good abrasion resistance, and good wrinkle resistance. Moreover, it is more competitive in price than pure wool fabrics. Therefore, it is necessary to provide a breathable and abrasion-resistant worsted wool-polyester yarn for aircraft use. Summary of the Invention

[0004] To improve the breathability and abrasion resistance of fabrics, this application provides a process for preparing breathable and abrasion-resistant worsted wool-polyester yarn for aviation applications.

[0005] The technical solution for preparing a breathable and wear-resistant worsted wool-polyester yarn for aviation applications provided in this application is as follows: A process for preparing a breathable and wear-resistant worsted wool-polyester yarn for aerospace applications includes the following steps: (1) Select wool and certified GRS original color round cross section polyester with a mass ratio of (2.5-3.5):(6.5-7.5); (2) Dye the wool to obtain dyed wool strips; (3) Mix the dyed wool tops and polyester tops 3-5 times, and then comb them to obtain combed wool tops; (4) The combed wool tops are processed through five needle combs, roving, spinning, winding, oiling the winding, waxing the twinning, twisting and steaming to obtain breathable and wear-resistant aviation worsted wool-polyester yarn.

[0006] Certified GRS original color circular cross-section polyester boasts excellent colorfastness and abrasion resistance. It is also highly soft, breathable, heat-resistant, and strong. Furthermore, this polyester exhibits good sun resistance, effectively protecting seats and seat covers, and possesses excellent UV protection, abrasion resistance, and tear resistance. Through a five-stage combing process, including roving, spinning, winding, winding oiling, doubling waxing, twisting, and steaming, the arrangement and structure of the fibers within the wool-polyester yarn are improved. This ensures even distribution of fiber stress, enhances cohesion, reduces frictional resistance, thereby improving the overall stability of the yarn, eliminating internal stress, reducing the risk of breakage, and significantly enhancing tear resistance and abrasion resistance.

[0007] Preferably, the wool is Merino superfine untreated wool with a fineness of 19.5-23.5 microns, and the polyester has a fineness of 2.2-3.3 dtex.

[0008] Using wool and polyester of the above specifications can effectively improve the abrasion resistance, tear resistance and UV resistance of wool-polyester yarn.

[0009] Preferably, the winding oiling step includes: storing the winding balls at a temperature of 23-26℃ and a humidity of 55-65% for 4 hours, uniformly applying wax oil to the surface of the winding balls, and equilibrating them at a temperature of 23-26℃ and a humidity of 55-65% for 8 hours after applying the wax oil.

[0010] By combining the above-mentioned winding oiling treatment with the subsequent doffing waxing, a double protective film is formed on the yarn surface, reducing the coefficient of friction between fibers and between the yarn and the equipment, reducing the heat and wear generated by friction. The doffing waxing further enhances the smoothness of the yarn surface, making the yarn smoother during processing and use, greatly improving the yarn's abrasion resistance. When encountering external friction and tearing, it can better maintain structural stability, improve the yarn's tear resistance and abrasion resistance, reduce yarn surface fuzz, and thus improve quality.

[0011] Preferably, the wool dyeing process includes the following steps: soaking and washing the wool with detergent, rinsing it thoroughly with water to obtain washed wool; placing the washed wool in water, adding a pH adjuster, a leveling agent, polyphenolic compounds and hydrogen peroxide, heating to a first temperature plateau and holding it at that temperature, then heating to a second temperature plateau, adding dye and hydrogen peroxide, holding it at that temperature, cooling and washing to obtain washed fabric, and then performing a color-fixing treatment on the washed fabric to obtain dyed wool tops.

[0012] By performing the above steps to dye wool, the dye uptake rate can be improved, and a good dyeing effect can be achieved. Polyphenolic compounds can interact with dye molecules, enhance the adsorption and binding force of dyes on wool fibers, improve the color fastness of dyeing, and improve the overall effect of wool dyeing. Polyphenolic compounds have good antioxidant properties, which can protect wool and improve the stability and UV resistance of wool.

[0013] Preferably, the dye includes acid dyes and metal complex dyes.

[0014] Acid dyes offer vibrant colors, while metal complex dyes boast high color fastness and stability. Combining the two enhances the vibrancy and durability of dyeing. The metal ions in metal complex dyes absorb and scatter ultraviolet rays, reducing UV damage to wool fibers. Polyphenolic compounds themselves possess antioxidant and UV-absorbing properties. Working together with these two dyes, they enhance the UV resistance of wool, protecting wool fibers from UV damage and extending the lifespan of wool-polyester yarns.

[0015] Preferably, the breathable and wear-resistant aerospace worsted wool-polyester yarn is post-finished with a finishing solution, the raw materials for which the finishing solution is prepared include polyisocyanate and tetraethyl orthosilicate.

[0016] Polyisocyanates can react with active groups on the yarn surface to form a cross-linked structure, enhancing the hardness and integrity of the yarn surface. The silica particles generated after the hydrolysis and condensation of tetraethyl orthosilicate are uniformly distributed on the yarn surface, reducing the resistance of the yarn during friction with the external environment. This synergistic effect with polyisocyanates strengthens the surface structure of wool-polyester yarns, effectively improving their abrasion resistance. The special functional groups of polyisocyanates can absorb some ultraviolet energy and convert it into heat or other forms of energy. The silica network structure formed by tetraethyl orthosilicate can also scatter ultraviolet rays, reducing the probability of ultraviolet rays penetrating the yarn and reaching the internal fibers, protecting the fibers from ultraviolet damage, thus improving the UV resistance of wool-polyester yarns. The cross-linked structure formed between yarn fibers by polyisocyanates enhances the tightness and cohesion between fibers. The silica generated by tetraethyl orthosilicate helps to disperse stress when the yarn is torn by external forces, preventing stress concentration on any one fiber, thereby improving the tear resistance of wool-polyester yarns.

[0017] Preferably, the raw materials for preparing the polyisocyanate include isophorone diisocyanate trimer and 2-hydroxy-4-acryloyloxybenzophenone.

[0018] 2-Hydroxy-4-acryloyloxybenzophenone contains a benzophenone group that can absorb ultraviolet light. After reacting with isophorone diisocyanate trimer, the polyisocyanate acquires the ability to absorb ultraviolet light. Moreover, the unique molecular structure of polyisocyanate can absorb and convert ultraviolet energy through chemical bond vibration and electron transition. During the fabric finishing process, it can form a protective layer on the material surface, reducing the damage of ultraviolet light to the internal structure of the material, thereby improving the UV resistance of wool and polyester yarns.

[0019] Preferably, the mass ratio of the isophorone diisocyanate trimer to 2-hydroxy-4-acryloyloxybenzophenone is 1:(0.4-0.8).

[0020] The polyisocyanate prepared according to the above mass ratio has good reactive crosslinking properties and UV resistance.

[0021] Preferably, the raw materials for preparing the finishing solution also include a fluorosilicone modifier.

[0022] Preferably, the fluorosilicone modifier includes one of trifluoropropylmethylcyclotrisiloxane and perfluorooctyltriethoxysilane.

[0023] The fluorinated groups in fluorosilicone modifiers have low surface energy, enabling them to graft and modify the surface of the silica network formed by tetraethyl orthosilicate, thus significantly reducing its surface energy and forming a stronger, smoother protective film. This reduces frictional resistance, resulting in less wear on the yarn during friction. Simultaneously, the reinforced structure improves surface hardness and toughness, making it less prone to scratches or damage under external forces, significantly enhancing abrasion resistance. Furthermore, the fluorosilicone modifier, in conjunction with polyisocyanates and tetraethyl orthosilicate, forms a denser protective network that absorbs and scatters ultraviolet rays, reducing UV damage to the yarn's internal fibers and lowering UV transmittance, further enhancing the yarn's UV resistance and improving the stability of wool-polyester yarns.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. Certified GRS original color round cross-section polyester with good color fastness and enhanced abrasion resistance. It boasts advantages such as high softness, good breathability, good heat resistance, and high strength. This polyester also exhibits good sun resistance, effectively protecting seats and seat covers, and possesses excellent UV resistance, abrasion resistance, and tear resistance. Through a five-stage combing process, roving, spinning, winding, winding oiling, doubling waxing, twisting, and steaming, the internal fiber arrangement and structure of the wool-polyester yarn are improved, resulting in more even fiber stress distribution, enhanced cohesion, and reduced frictional resistance. This enhances the overall stability of the yarn, eliminates internal stress, reduces the risk of breakage, and significantly improves tear resistance and abrasion resistance.

[0025] 2. Polyphenolic compounds can interact with dye molecules, enhancing the adsorption and binding force of dyes on wool fibers, improving color fastness, and enhancing the overall dyeing effect of wool. Polyphenolic compounds also possess excellent antioxidant properties, protecting wool and improving its stability and UV resistance. Acid dyes offer vibrant colors, while metal complex dyes exhibit high color fastness and stability; combining the two can enhance the vibrancy and durability of the dyeing. The metal ions in metal complex dyes can absorb and scatter ultraviolet rays, reducing UV damage to wool fibers. Polyphenolic compounds themselves possess antioxidant and UV-absorbing capabilities; working together with these two dyes, they enhance the UV resistance of wool, protecting wool fibers from UV damage and extending the lifespan of wool-polyester yarns.

[0026] 3. Polyisocyanates can react with active groups on the yarn surface to form a cross-linked structure, enhancing the hardness and integrity of the yarn surface. The silica particles generated after the hydrolysis and condensation of tetraethyl orthosilicate are uniformly distributed on the yarn surface, reducing the resistance of the yarn during friction with the external environment. This, combined with polyisocyanates, strengthens the surface structure of wool-polyester yarns, effectively improving their abrasion resistance. The special functional groups of polyisocyanates can absorb some ultraviolet energy, converting it into heat and other forms of energy. The silica network structure formed by tetraethyl orthosilicate can also scatter ultraviolet rays, reducing the probability of ultraviolet rays penetrating the yarn and reaching the internal fibers, protecting the fibers from ultraviolet damage, thus improving the UV resistance of wool-polyester yarns. The cross-linked structure formed between yarn fibers by polyisocyanates enhances the tightness and cohesion between fibers. The silica generated by tetraethyl orthosilicate helps to disperse stress when the yarn is torn by external forces, preventing stress concentration on any one fiber, thereby improving the tear resistance of wool-polyester yarns. Detailed Implementation

[0027] This application discloses a process for preparing breathable and wear-resistant worsted wool-polyester yarn for aviation applications. Unless otherwise specified, all raw materials used in this application can be obtained from commercially available sources. The following detailed description, in conjunction with embodiments, further illustrates this application: Raw material description: The wool is Merino superfine untreated wool with a fineness of 19.5-23.5 microns, purchased from Zhangjiagang Xianghe Textile Co., Ltd.; the polyester is certified GRS black round cross-section polyester with a fineness of 2.2-3.3 dtex; certified GRS black round cross-section polyester, dyed polyester, and non-round cross-section polyester were purchased from Hangzhou Haoye Industrial Co., Ltd.; the nonionic detergent is AEO-9; the pH adjuster is acetic acid and sodium acetate in a 2:1 mass ratio; the leveling agent is AC-1815; the polyphenolic compound is catechin (CAS No.: 154-23-4); and the acid dye (CAS No.: The metal complex dye was 1:2 type metal complex dye B-34, purchased from Wenzhou Meerno Chemical Co., Ltd.; the isophorone diisocyanate trimer was purchased from Jining Zhongjian Chemical Co., Ltd.; and the organotin catalyst was dibutyltin dilaurate (CAS No.: 77-58-7), 2-hydroxy-4-acryloyloxybenzophenone (CAS No.: 15419-94-0), tetraethyl orthosilicate (CAS No.: 78-10-4), trifluoropropylmethylcyclotrisiloxane (CAS No.: 2374-14-3), and perfluorooctyltriethoxysilane (CAS No.: 51851-37-7).

[0028] Example 1 (1) Select wool and polyester with a mass ratio of 2.5:7.5; (2) Soak and wash the wool with a non-ionic detergent, rinse thoroughly with water to obtain the washed wool; place the washed wool in water with a bath ratio of 1:20, add pH adjuster, leveling agent, polyphenolic compound and hydrogen peroxide, so that the pH adjuster accounts for 1% of the total mass of the bath liquid, the leveling agent accounts for 5% of the total mass of the bath liquid, the polyphenolic compound accounts for 2% of the total mass of the bath liquid, and the hydrogen peroxide accounts for 3% of the total mass of the bath liquid. Heat to 40℃ and keep warm for 10 minutes. After the heat preservation is completed, heat to 80℃, add dye and hydrogen peroxide, the dye accounts for 2% of the total mass of the bath liquid, the mass ratio of acid dye and metal complex dye in the dye is 1:1, and the hydrogen peroxide accounts for 1% of the total mass of the bath liquid. Keep warm for 20 minutes, cool, take out the dyed wool, place it in water, heat to 50℃, keep warm for 1 hour to complete the color fixation treatment, and obtain dyed wool strips; (3) The dyed wool tops and polyester tops are mixed 5 times, and then mixed, combed and stretched to obtain mixed wool tops. After spraying the mixed wool tops with wool oil, they are fed into a combing machine with 18 wool heads fed in at a weight of 2×18g / m. After one combing, combed wool tops are obtained. (4) Five-pass combing: The combed sliver is passed through five passes to obtain fiber evenness; Roving: The fiber evenness is stretched 12 times, and the roller center distance is 63 / 70mm to obtain roving; Spinning: The roving is fed into the spinning frame, stretched 18 times, with a spacing of 53 / 59mm, a spinning twist coefficient of 90, and a spindle speed of 8000r / min to obtain spinning; Winding: Harmful hairs, foreign fibers, thick and thin parts are removed from the spinning to obtain semi-finished yarn; Winding oiling: The winding balls are stored at a temperature of 23℃ and a humidity of 55% for 4 hours, and oil is applied to the surface of the winding balls. The yarn is waxed by evenly applying wax oil to the surface and then equilibrating it at 23℃ and 55% humidity for 8 hours. The resulting semi-finished yarn is then waxed again using a uniform waxing system. The yarn is then doubled and waxed again to obtain a second-waxed semi-finished yarn. Finally, the double-waxed semi-finished yarn is twisted on a twisting machine to increase its twist and make it more stable, resulting in a double-twisted yarn. The double-twisted yarn is then steamed twice at 90℃ for 10 minutes per cycle under a vacuum of 80 kPa to obtain a breathable and wear-resistant aerospace worsted yarn.

[0029] Example 2 (1) Select wool and polyester with a mass ratio of 3.5:6.5; (2) Soak and wash the wool with a non-ionic detergent, rinse thoroughly with water to obtain the washed wool; place the washed wool in water with a bath ratio of 1:20, add pH adjuster, leveling agent, polyphenolic compound and hydrogen peroxide, so that the pH adjuster accounts for 1% of the total mass of the bath liquid, the leveling agent accounts for 5% of the total mass of the bath liquid, the polyphenolic compound accounts for 2% of the total mass of the bath liquid, and the hydrogen peroxide accounts for 3% of the total mass of the bath liquid. Heat to 40℃ and keep warm for 10 minutes. After the heat preservation is completed, heat to 80℃, add dye and hydrogen peroxide, the dye accounts for 2% of the total mass of the bath liquid, the mass ratio of acid dye and metal complex dye in the dye is 1:1, and the hydrogen peroxide accounts for 1% of the total mass of the bath liquid. Keep warm for 20 minutes, cool, take out the dyed wool, place it in water, heat to 50℃, keep warm for 1 hour to complete the color fixation treatment, and obtain dyed wool strips; (3) The dyed wool tops and polyester tops are mixed 5 times, and then mixed, combed and stretched to obtain mixed wool tops. After spraying the mixed wool tops with wool oil, they are fed into a combing machine with 18 wool heads fed in at a weight of 2×18g / m. After one combing, combed wool tops are obtained. (4) Five-pass combing: The combed sliver is passed through five passes to obtain fiber evenness; Roving: The fiber evenness is stretched 12 times, and the roller center distance is 63 / 70mm to obtain roving; Spinning: The roving is fed into the spinning frame, stretched 18 times, with a spacing of 53 / 59mm, a spinning twist coefficient of 90, and a spindle speed of 8000r / min to obtain spinning; Winding: Harmful hairs, foreign fibers, thick and thin parts are removed from the spinning to obtain semi-finished yarn; Winding oiling: The winding balls are stored at a temperature of 26℃ and a humidity of 65% for 4 hours, and oil is applied to the surface of the winding balls. The yarn is waxed by evenly applying wax oil to the surface and then equilibrating it at 26℃ and 65% humidity for 8 hours. The resulting semi-finished yarn is then waxed again using a uniform waxing system. The yarn is then doubled and waxed again to obtain a second-waxed semi-finished yarn. Finally, the double-waxed semi-finished yarn is twisted on a twisting machine to increase its twist and make it more stable, resulting in a double-twisted yarn. The double-twisted yarn is then steamed twice at 90℃ for 10 minutes per cycle under a vacuum of 80 kPa to obtain a breathable and wear-resistant aerospace worsted yarn.

[0030] Example 3 (1) Select wool and polyester in a mass ratio of 3:7; (2) Soak and wash the wool with a non-ionic detergent, rinse thoroughly with water to obtain the washed wool; place the washed wool in water with a bath ratio of 1:20, add pH adjuster, leveling agent, polyphenolic compound and hydrogen peroxide, so that the pH adjuster accounts for 1% of the total mass of the bath liquid, the leveling agent accounts for 5% of the total mass of the bath liquid, the polyphenolic compound accounts for 2% of the total mass of the bath liquid, and the hydrogen peroxide accounts for 3% of the total mass of the bath liquid. Heat to 40℃ and keep warm for 10 minutes. After the heat preservation is completed, heat to 80℃, add dye and hydrogen peroxide, the dye accounts for 2% of the total mass of the bath liquid, the mass ratio of acid dye and metal complex dye in the dye is 1:1, and the hydrogen peroxide accounts for 1% of the total mass of the bath liquid. Keep warm for 20 minutes, cool, take out the dyed wool, place it in water, heat to 50℃, keep warm for 1 hour to complete the color fixation treatment, and obtain dyed wool strips; (3) The dyed wool tops and polyester tops are mixed 5 times, and then mixed, combed and stretched to obtain mixed wool tops. After spraying the mixed wool tops with wool oil, they are fed into a combing machine with 18 wool heads fed in at a weight of 2×18g / m. After one combing, combed wool tops are obtained. (4) Five-pass combing: The combed sliver is passed through five passes to obtain fiber evenness; Roving: The fiber evenness is stretched 12 times, and the roller center distance is 63 / 70mm to obtain roving; Spinning: The roving is fed into the spinning frame, stretched 18 times, with a spacing of 53 / 59mm, a spinning twist coefficient of 90, and a spindle speed of 8000r / min to obtain spinning; Winding: Harmful hairs, foreign fibers, thick and thin fibers, etc. are removed from the spinning to obtain semi-finished yarn; Winding oiling: The winding balls are stored at a temperature of 24.5℃ and a humidity of 60% for 4 hours, and oil is applied to the surface of the winding balls. The yarn is waxed by evenly applying wax oil to the surface and then equilibrating it at 24.5℃ and 60% humidity for 8 hours. The resulting semi-finished yarn is then waxed again using a uniform waxing system. The yarn is then doubled and waxed again to obtain a second-waxed semi-finished yarn. Finally, the double-waxed semi-finished yarn is twisted on a twisting machine to increase its twist and make it more stable, resulting in a double-twisted yarn. The double-twisted yarn is then steamed twice at 90℃ for 10 minutes per cycle under a vacuum of 80 kPa to obtain a breathable and wear-resistant aerospace worsted yarn.

[0031] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that the dye is replaced with an acid dye in Example 4.

[0032] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that no polyphenolic compounds are added to the bath solution in Example 5.

[0033] Preparation Example 1: Preparation of Polyisocyanates 3.57 kg of isophorone diisocyanate trimer and 0.05 kg of organotin catalyst were dispersed in 10 L of toluene. Under stirring at 60 °C and 200 rpm, a toluene solution containing 1.43 kg of 2-hydroxy-4-acryloyloxybenzophenone was added over 1 hour. The reaction was continued for 4 hours under stirring at 60 °C and 200 rpm. The solvent was removed by rotary evaporation to obtain polyisocyanate.

[0034] Preparation Example 2 Preparation Example 2 was based on Preparation Example 1. The only difference between Preparation Example 2 and Preparation Example 1 was that the amount of isophorone diisocyanate trimer was 2.78 kg and the amount of 2-hydroxy-4-acryloyloxybenzophenone was 2.22 kg.

[0035] Preparation Example 3 Preparation Example 3 was based on Preparation Example 1. The only difference between Preparation Example 3 and Preparation Example 1 was that the amount of isophorone diisocyanate trimer was 3.12 kg and the amount of 2-hydroxy-4-acryloyloxybenzophenone was 1.88 kg.

[0036] Preparation Example 4 Preparation Example 4 was based on Preparation Example 1. The only difference between Preparation Example 4 and Preparation Example 1 was that the amount of isophorone diisocyanate trimer was 4.17 kg and the amount of 2-hydroxy-4-acryloyloxybenzophenone was 0.83 kg.

[0037] Preparation Example 5 Preparation Example 5 was based on Preparation Example 1. The only difference between Preparation Example 5 and Preparation Example 1 was that the amount of isophorone diisocyanate trimer was 2.5 kg and the amount of 2-hydroxy-4-acryloyloxybenzophenone was 2.5 kg.

[0038] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that Example 6 undergoes post-processing.

[0039] 2 kg of tetraethyl orthosilicate was dispersed in 10 L of anhydrous ethanol and stirred at 200 rpm for 30 min to obtain a tetraethyl orthosilicate solution. 0.5 L of deionized water was added to the tetraethyl orthosilicate solution, and the temperature was raised to 60 °C. The pH was adjusted to 4 using concentrated hydrochloric acid. 0.8 kg of trifluoropropylmethylcyclotrisiloxane was added to the pH-adjusted solution, and the mixture was stirred at 200 rpm for 4 h at 60 °C. The solvent was removed by rotary evaporation to obtain a modified silica sol. 0.5 kg of the modified silica sol and 2 kg of the polyisocyanate prepared in Preparation Example 1 were added to 10 L of ethyl acetate and dispersed at 300 rpm for 15 min to obtain a finishing solution.

[0040] The steamed yarn is dipped and rubbed twice in a finishing solution with a liquor ratio of 1:20. After pre-drying at 80℃ for 2 minutes, it is baked at 160℃ for 2 minutes to obtain a breathable and wear-resistant aerospace worsted wool-polyester yarn.

[0041] Example 7 Example 7 is based on Example 6. The only difference between Example 7 and Example 6 is that the polyisocyanate prepared in Preparation Example 1 is replaced with the polyisocyanate prepared in Preparation Example 2 in Example 7.

[0042] Example 8 Example 8 is based on Example 6. The only difference between Example 8 and Example 6 is that the polyisocyanate prepared in Preparation Example 1 is replaced with the polyisocyanate prepared in Preparation Example 3 in Example 8.

[0043] Example 9 Example 9 is based on Example 6. The only difference between Example 9 and Example 6 is that the polyisocyanate prepared in Preparation Example 1 is replaced with the polyisocyanate prepared in Preparation Example 4 in Example 9.

[0044] Example 10 Example 10 is based on Example 6. The only difference between Example 10 and Example 6 is that the polyisocyanate prepared in Preparation Example 1 is replaced with the polyisocyanate prepared in Preparation Example 5 in Example 10.

[0045] Example 11 Example 11 is based on Example 6. The only difference between Example 11 and Example 6 is that in Example 11, trifluoropropylmethylcyclotrisiloxane is replaced with perfluorooctyltriethoxysilane.

[0046] Example 12 Example 12 is based on Example 6. The only difference between Example 12 and Example 3 is that the polyisocyanate prepared in Preparation Example 1 is replaced with isophorone diisocyanate trimer in Example 12.

[0047] Example 13 Example 13 is based on Example 6. The only difference between Example 13 and Example 6 is that no fluorosilicone modifier is added in Example 13.

[0048] Comparative Example 1 Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that Comparative Example 1 replaces certified GRS black circular cross-section polyester with dyed polyester.

[0049] Comparative Example 2 Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that Comparative Example 2 replaces certified GRS black circular cross-section polyester with non-circular cross-section polyester.

[0050] Performance testing (1) The breaking strength and elongation at break of the yarn were tested using the standards GB / T3916-2013 Determination of breaking strength and elongation at break of single yarn in packaged textiles (CRE method) and GB / T 31899-2015 Weather resistance test of textiles by ultraviolet light exposure. After the yarn was exposed to ultraviolet light for 1000 hours, the breaking strength and elongation at break were tested again. Three samples were prepared for each sample, and the average value was taken after measurement. The results are recorded in Table 1.

[0051] (2) Select GB / T 3920—2008 Textiles Color Fastness Test - Color Fastness to Rubbing as the standard, conduct dry rubbing test and wet rubbing test, record the staining grade, and record the results in Table 1.

[0052] Table 1. Test results of tear resistance, UV resistance, and abrasion resistance of yarn. As shown in Table 1, the breaking strength before UV exposure of Examples 1-3 is greater than 1007.1 cN and the elongation at break is greater than 31.64%. The breaking strength after UV exposure is greater than 855.7 cN and the elongation at break is greater than 25.13%. The color fastness to dry rubbing and the color fastness to wet rubbing are both grade 4-5. This shows that the wool-polyester yarn prepared in this application has good tear resistance, UV resistance and abrasion resistance.

[0053] As shown in Table 1, the only difference between Examples 4 and 5 and Example 3 is that the dye in Example 4 was replaced with an acid dye, and no polyphenolic compounds were added to the bath solution in Example 5. Compared with Example 3, the UV resistance and abrasion resistance of Examples 4 and 5 decreased. This is because the absence of metal complex dyes or polyphenolic compounds will affect the synergistic effect between the two, resulting in a decrease in the ability to absorb ultraviolet rays and antioxidant properties, which will affect the color fastness and reduce the abrasion resistance and UV resistance.

[0054] As shown in Table 1, the only difference between Examples 6-10 and Example 3 is that: in Example 6, the wool-polyester yarn was post-finished; in Examples 7-10, the ratio of raw materials for synthesizing polyisocyanates was changed based on Example 6. Compared with Example 3, the UV resistance, tear resistance, and abrasion resistance of Examples 6-10 were all improved. This is because the post-finishing of the wool-polyester yarn increased the cross-linking degree between fibers and introduced UV-resistant functional groups and inorganic particles, thereby improving its UV resistance, abrasion resistance, and tear resistance. In Examples 6-8, the ratio of raw materials for polyisocyanates was within the specified range, resulting in a good modification effect. Examples 9 and 10 disrupted the specified ratio. Too much or too little 2-hydroxy-4-acryloyloxybenzophenone affected the reactivity of polyisocyanates, leading to a decrease in the stability of the protective layer formed by post-finishing and a worse post-finishing effect. As a result, the UV resistance, abrasion resistance, and tear resistance were lower than those of Examples 6-8.

[0055] As shown in Table 1, the only difference between Examples 11-13 and Example 6 is that in Example 11, trifluoropropylmethylcyclotrisiloxane was replaced with perfluorooctyltriethoxysilane; in Example 12, the polyisocyanate prepared in Preparation Example 1 was replaced with isophorone diisocyanate trimer; and in Example 13, no fluorosilicone modifier was added. The UV resistance, abrasion resistance, and tear resistance of Example 11 are similar to those of Example 6, and perfluorooctyltriethoxysilane can also achieve good modification effects. The UV resistance, abrasion resistance, and tear resistance of Examples 12 and 13 are all reduced. This is because the lack of 2-hydroxy-4-acryloyloxybenzophenone to modify the isophorone diisocyanate trimer or the absence of fluorosilicone modifier will affect the stability of the system and reduce the synergistic effect between the components in the finishing solution, thus reducing the UV resistance, abrasion resistance, and tear resistance.

[0056] As shown in Table 1, the only difference between Comparative Examples 1 and 2 and Example 3 is that Comparative Example 1 replaced the certified GRS black circular cross-section polyester with dyed polyester, and Comparative Example 2 replaced the certified GRS black circular cross-section polyester with non-circular cross-section polyester. Compared with Example 3, the UV resistance, abrasion resistance, and tear resistance of Comparative Examples 1 and 2 are generally lower. This is because the properties of dyed polyester decrease after dyeing, and the non-circular cross-section polyester has uneven performance due to its morphological differences. In summary, certified GRS black circular cross-section polyester can achieve better performance when used to prepare wool-polyester yarn.

[0057] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A process for preparing breathable and wear-resistant worsted wool-polyester yarn for aviation, characterized in that: Includes the following steps: (1) Select wool and certified GRS original color round cross section polyester with a mass ratio of (2.5-3.5): (6.5-7.5); (2) Dye the wool to obtain dyed wool strips; (3) The dyed wool tops and polyester tops are mixed 3-5 times and then combed to obtain combed wool tops; (4) The combed wool tops are processed through five needle combing, roving, spinning, winding, winding oiling, doubling waxing, twisting and steaming to obtain breathable and wear-resistant aviation worsted wool-polyester yarn. The wool dyeing process includes the following steps: soaking and washing the wool with detergent, rinsing it thoroughly with water to obtain washed wool; placing the washed wool in water, adding pH adjuster, leveling agent, polyphenolic compound and hydrogen peroxide, heating to the first temperature plateau and keeping it at that temperature, after the heat preservation is completed, heating to the second temperature plateau, adding dye and hydrogen peroxide, keeping it at that temperature, cooling and washing to obtain washed fabric, and then performing a color-fixing treatment on the washed fabric to obtain dyed wool tops; The dyes include acid dyes and metal complex dyes; The breathable and wear-resistant aerospace worsted wool-polyester yarn is post-finished with a finishing solution, the raw materials for which the finishing solution is prepared include polyisocyanate and tetraethyl orthosilicate. The raw materials for preparing the polyisocyanate include isophorone diisocyanate trimer and 2-hydroxy-4-acryloyloxybenzophenone; The mass ratio of the isophorone diisocyanate trimer to 2-hydroxy-4-acryloyloxybenzophenone is 1:(0.4-0.8).

2. The preparation process of a breathable and wear-resistant worsted wool-polyester yarn for aviation as described in claim 1, characterized in that: The wool is Merino superfine untreated wool with a fineness of 19.5-23.5 microns, and the polyester has a fineness of 2.2-3.3 dtex.

3. The preparation process of a breathable and wear-resistant worsted wool-polyester yarn for aviation as described in claim 1, characterized in that: The winding oiling step includes: storing the winding balls at a temperature of 23-26℃ and a humidity of 55-65% for 4 hours, uniformly applying wax oil to the surface of the winding balls, and then equilibrating them at a temperature of 23-26℃ and a humidity of 55-65% for 8 hours after applying the wax oil.

4. The preparation process of a breathable and wear-resistant worsted wool-polyester yarn for aviation as described in claim 1, characterized in that: The raw materials for preparing the finishing solution also include fluorosilicone modifiers.

5. The preparation process of a breathable and wear-resistant worsted wool-polyester yarn for aviation as described in claim 4, characterized in that: The fluorosilicone modifier includes one of trifluoropropylmethylcyclotrisiloxane and perfluorooctyltriethoxysilane.

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