Process method for high-proportion color spinning ramie vortex spinning yarn

Abstract

The invention relates to the technical field of spinning yarn preparation, and particularly discloses a process method of high-proportion color spinning ramie vortex spinning yarn, which comprises the following steps: (1) raw material preparation: 70%-75% of ramie fiber and 20%-35% of vinylon; (2) oiling treatment: pre-covering the ramie fibers and the vinylon for 2-4 days by using a self-made oiling agent; (3) cotton blending and carding: performing cotton blending on the oiled ramie fibers and vinylon, and then carding to obtain cotton slivers; (4) drawing: the cotton slivers are subjected to 2-3 drawing procedures, the number of first drawing yarns is 6, the total draft multiple is 6-7, the number of second drawing yarns is 8, the total draft multiple is 7-9, the number of third drawing yarns is 8, and the total draft multiple is 7-9, and drawn slivers are prepared; (5) vortex spinning: drawing the drawn slivers, gathering and twisting, and winding and forming to obtain the high-proportion color spinning ramie vortex spinning yarn. The process method provided by the invention can significantly improve the spinning performance of the ramie raw material.

Description

Technical Field

[0001] This application relates to the field of yarn preparation technology, and more specifically, it relates to a process for high-proportion dyed ramie vortex spinning yarn. Background Technology

[0002] Ramie is one of the most important fiber crops in ancient China. Originally from southwestern China, it was already being cultivated in some areas of the middle and lower reaches of the Yangtze River during the Neolithic Age. China accounts for over 90% of the world's ramie production and is internationally known as "Chinese grass." Among various bast fibers, ramie fibers are the longest and strongest, though slightly coarser. Refined ramie is pure white, has a silky luster, is breathable, conducts heat quickly, and feels cool to wear.

[0003] However, ramie is a natural fiber with weak cohesion between fibers, making it prone to problems such as fuzz and breakage during spinning. Currently, technological improvements in ramie spinning processing largely rely on the modification of special spinning equipment, such as using compact spinning technology to optimize yarn structure and reduce fuzz generation. However, the inherent rigidity and brittleness of ramie fibers have not been fundamentally resolved. Therefore, there is an urgent need for a process method that can improve the spinning performance of ramie raw materials. Summary of the Invention

[0004] To address the problems in the prior art, this application provides a process for producing high-proportion dyed ramie vortex-spun yarn.

[0005] Firstly, this application provides a process for producing high-proportion dyed ramie vortex-spun yarn, employing the following technical solution: A process for producing high-proportion dyed ramie vortex-spun yarn includes the following steps: (1) Raw material preparation: 70%-75% ramie fiber and 20%-35% vinylon; (2) Oiling treatment: Pre-soak ramie fibers and vinylon with a homemade oiling agent for 2-4 days; (3) Blending and carding: The oiled ramie fibers are blended with vinylon and then carded to obtain cotton slivers; (4) Drawing: The cotton sliver is drawn through 2-3 drawing processes. The first drawing process has 6 slivers and a total draft ratio of 6-7 times. The second drawing process has 8 slivers and a total draft ratio of 7-9 times. The third drawing process has 8 slivers and a total draft ratio of 7-9 times, to obtain a finished sliver. (5) Vortex spinning: The sliver is drawn, gathered, twisted, and wound into shape to obtain a high proportion of colored ramie vortex spun yarn.

[0006] By adopting the above technical solution and using a high ratio of ramie to viscose, the excellent natural properties of ramie fibers, such as moisture absorption and antibacterial properties, are maximized. The flexibility and cohesion of vinylon effectively improve the high rigidity and poor extensibility of ramie fibers, enhancing overall spinnability. Pre-curing for 2-4 days after oiling allows the self-made oil to fully penetrate the ramie and vinylon fibers, forming a uniform and stable lubricating film on the fiber surface. This significantly reduces the coefficient of friction between fibers and between fibers and processing components, minimizing fiber breakage during high-speed processing. Furthermore, it enhances the fiber's moisture absorption and antistatic properties, preventing fiber entanglement, fly waste, and uneven color spots caused by static electricity, ensuring stable spinning. Multiple drawing and drafting processes achieve uniform fiber mixing and orientation, reducing short fibers and neps in the sliver. After multiple drawing processes, the fibers are more regularly arranged, with enhanced cohesion. The gathering and twisting effect of vortex spinning creates a tight wrapping structure on the yarn surface, reducing hair exposure.

[0007] Optionally, the homemade oil contains the following raw materials in weight percentages: White vinegar 5%-10%, soap powder 2%-5%, modified silicone oil 1%-3%, modified resin 0.8%-1.5%, glycerin 1%-3%, water to make up to 100%.

[0008] Optionally, the method for preparing the modified silicone oil includes the following steps: (1) After mixing hydrogen-containing silicone oil with allyl polyether, the temperature is raised to 120-140℃, nitrogen is introduced for 2-3 hours to remove water, and then the temperature is lowered to 80-90℃. Isopropanol-chloroplatinic acid catalyst is added and kept warm for 2-3 hours. Isopropanol-chloroplatinic acid catalyst is removed by diatomaceous earth adsorption and purification to obtain hydroxyethoxypropyl silicone oil. The mass ratio of hydrogen-containing silicone oil, allyl polyether and isopropanol-chloroplatinic acid catalyst is 100-110:38-40:0.2-0.4. (2) Mix hydroxyethoxypropyl silicone oil, KH-560, dimethoxy(methyl)phenylsilane and decamethyltetrasiloxane evenly, heat to 80-90℃, stir, add tetrabutylammonium hydroxide, continue the reaction for 6-7h, add glacial acetic acid to neutralize tetrabutylammonium hydroxide, make the reaction pH 6.5-7.5, raise the temperature to 120-130℃, remove byproducts under vacuum, and obtain modified silicone oil.

[0009] By employing the above technical solution, the Si-H bonds of hydrogen-containing silicone oil and the C=C double bonds of allyl polyether undergo a hydrosilylation reaction under the catalysis of a catalyst to generate Si-CCO. -The chain segments were used to obtain hydroxyethoxypropyl silicone oil containing Si-OH active sites. The Si-OH of the hydroxyethoxypropyl silicone oil and the Si-OR of KH-560 and dimethoxy(methyl)phenylsilane under the catalysis of tetrabutylammonium hydroxide underwent a de-alcoholization condensation reaction to construct a siloxane backbone. The hydrophobic siloxane backbone provides lubrication, and the hydrophilic hydroxyethoxypropyl side chain forms hydrogen bonds with the hydroxyl groups on the surface of ramie fibers. The lubricating film is firmly attached to the surface of ramie fibers, which significantly reduces the friction coefficient between ramie fibers and enhances the cohesion between fibers.

[0010] Optionally, the mass ratio of hydroxyethoxypropylsilane, KH-560, dimethoxy(methyl)phenylsilane to decamethyltetrasiloxane is 100-110:15-20:10-12:8-10.

[0011] Optionally, the method for preparing the modified resin includes the following steps: (1) Mix N-methyldiethanolamine, 1,4-butanediol and catalyst, add isophorone diisocyanate dropwise at 40-50℃, keep warm for 2-3h to form isocyanate-terminated prepolymer; (2) Add p-hydroxyanisole and hydroxyethyl acrylate to the terminal isocyanate prepolymer, heat to 50-60℃ and react for 2-3 hours to obtain a semi-terminated prepolymer, add castor oil, heat to 70-80℃ and react for 6-7 hours, cool to 25-27℃, add 1,3-propanesulfonate lactone and methanol, and react for 24-26 hours to obtain the modified resin.

[0012] By employing the above technical solution, N-methyldiethanolamine and 1,4-butanediol, containing dihydroxyl and tertiary amine groups, are used as hydroxyl components. These components are reacted with isophorone diisocyanate via a carbamate esterification reaction to form a terminal isocyanate-based prepolymer. Subsequently, hydroxyethyl acrylate containing carbon-carbon double bonds is added, and a semi-terminated prepolymer is obtained through the reaction of hydroxyl groups with isocyanate groups. This prepolymer is then chain-extended with castor oil containing polyhydroxyl groups to construct a polyurethane backbone with both hard and flexible segments. Finally, 1,3-propanesulfonate lactone reacts with the tertiary amine groups of the backbone. The ring-opening reaction forms a zwitterionic structure of sulfobetaine, ultimately forming a functional resin with a polyurethane backbone, acrylic double bonds, and zwitterionic side chains. When this resin is added to a self-made oiling agent, the polyurethane backbone forms a continuous and dense film on the surface of ramie fibers. The film forms strong hydrogen bonds with the hydroxyl groups on the ramie surface, and combined with the ionic bonds of the zwitterionic side chains, a strong interfacial bond is constructed. The dispersed individual fibers are slightly bonded together by the film, which not only improves the cohesion between fibers, but also reduces the breakage rate during carding and drafting, and improves spinnability.

[0013] Optionally, the mass ratio of N-methyldiethanolamine, 1,4-butanediol and isophorone diisocyanate is 10:9-12:50-52.

[0014] Optionally, the mass ratio of p-hydroxyanisole, hydroxyethyl acrylate, castor oil, 1,3-propanesulfonate lactone, and methanol is 0.01-0.03:7-10:7-10:10-12:40-50.

[0015] Optionally, the catalyst is one or both of bismuth neodecanoate and bismuth isooctanoate.

[0016] By adopting the above technical solution, the nucleophilic addition reaction is accelerated by using a catalyst, which greatly improves the reaction efficiency and shortens the production cycle.

[0017] In summary, this application has the following beneficial effects: 1. This application utilizes hydrosilylation reaction and dealcoholization condensation to prepare modified silicone oil. The molecular structure of the modified silicone oil contains a siloxane backbone, hydroxyethoxypropyl group and epoxy group, etc. The siloxane backbone can form a continuous lubricating film on the surface of ramie fiber, which greatly reduces the friction coefficient between fibers. The epoxy group can undergo ring-opening reaction with the hydroxyl groups on the surface of ramie fiber to achieve chemical bonding between silicone oil and fiber, so that the lubricating film is not easy to fall off and continuously reduces the probability of fiber breakage and fuzz generation.

[0018] 2. In this application, N-methyldiethanolamine and 1,4-butanediol are used as hydroxyl donors to undergo carbamate esterification with isophorone diisocyanate through nucleophilic addition reaction to form a terminal isocyanate prepolymer. Then, a semi-terminated prepolymer is obtained by carbamate esterification reaction between hydroxyl groups and isocyanate groups. Subsequently, castor oil containing polyhydroxyl groups is added to complete the chain extension reaction, and finally a modified resin with polyurethane backbone, acrylic double bonds and zwitterionic side chains is formed. Its polyurethane backbone can form a continuous and dense film on the surface of ramie fiber, reducing the risk of breakage. The zwitterionic side chains can form ionic bonds with hydroxyl groups on the surface of ramie fiber, build a strong interfacial bond, strengthen the cohesion between individual fibers, and significantly improve the breaking strength of the fiber. Detailed Implementation

[0019] The following embodiments provide a further detailed description of this application. Preparation example of modified silicone oil

[0020] Sources of raw materials: Hydrogen-containing silicone oil is selected from Jinan Guanlin New Materials Co., Ltd., with an effective substance content of 99%; allyl polyether is selected from Jiangsu Haian Petrochemical Plant, with an industrial grade; diatomaceous earth is selected from Lingshou County Chuanqing Mineral Products Co., Ltd., with a grade of 325. Preparation Example 1-1: (1) 110g of hydrogen-containing silicone oil and 40g of allyl polyether were mixed, heated to 140°C, nitrogen gas was introduced for 3h, water was removed, the temperature was lowered to 90°C, 0.4g of isopropanol-chloroplatinic acid catalyst was added, the temperature was kept for 3h, and diatomaceous earth was used to adsorb and purify the isopropanol-chloroplatinic acid catalyst to obtain hydroxyethoxypropyl silicone oil. The isopropanol-chloroplatinic acid catalyst was prepared by dissolving isopropanol in chloroplatinic acid. (2) Mix 110g of hydroxyethoxypropyl silicone oil, 20g of KH-560, 12g of dimethoxy(methyl)phenylsilane and 10g of decamethyltetrasiloxane evenly, heat to 90℃, rotate at 200rpm, stir for 20min, add tetrabutylammonium hydroxide, continue the reaction for 7h, add glacial acetic acid to neutralize the tetrabutylammonium hydroxide, so that the pH of the reaction product is 7.5, raise the temperature to 130℃, connect a vacuum pump, and place under vacuum conditions to remove oligomers and by-products such as water and methanol generated during the reaction, and obtain modified silicone oil.

[0021] Preparation Example 1-2: (1) 105g of hydrogen-containing silicone oil and 39g of allyl polyether were mixed and heated to 130°C. Nitrogen gas was introduced for 2.5h to remove water. The temperature was then lowered to 85°C. 0.3g of isopropanol-chloroplatinic acid catalyst was added and kept warm for 2.5h. The isopropanol-chloroplatinic acid catalyst was removed by diatomaceous earth adsorption and purification to obtain hydroxyethoxypropyl silicone oil. The isopropanol-chloroplatinic acid catalyst was prepared by dissolving isopropanol in chloroplatinic acid. (2) Mix 105g of hydroxyethoxypropyl silicone oil, 17g of KH-560, 11g of dimethoxy(methyl)phenylsilane and 9g of decamethyltetrasiloxane evenly, heat to 90℃, stir at 200rpm for 20min, add tetrabutylammonium hydroxide, and continue the reaction for 6.5h. Add glacial acetic acid to neutralize the tetrabutylammonium hydroxide so that the pH of the reaction product is 7.0. Raise the temperature to 125℃, connect a vacuum pump, and place under vacuum conditions to remove oligomers and byproducts such as water and methanol generated during the reaction to obtain modified silicone oil.

[0022] Preparation Examples 1-3: (1) 100g of hydrogen-containing silicone oil was mixed with 38g of allyl polyether, heated to 120°C, nitrogen gas was introduced for 2h, water was removed, the temperature was lowered to 80°C, 0.4g of isopropanol-chloroplatinic acid catalyst was added, the temperature was maintained for 2h, and diatomaceous earth was used to adsorb and purify the isopropanol-chloroplatinic acid catalyst to obtain hydroxyethoxypropyl silicone oil. The isopropanol-chloroplatinic acid catalyst was prepared by dissolving isopropanol in chloroplatinic acid. (2) Mix 100g of hydroxyethoxypropyl silicone oil, 15g of KH-560, 10g of dimethoxy(methyl)phenylsilane and 8g of decamethyltetrasiloxane evenly, heat to 80℃, stir at 200rpm for 20min, add tetrabutylammonium hydroxide, continue the reaction for 6h, add glacial acetic acid to neutralize the tetrabutylammonium hydroxide, so that the pH of the reaction product is 6.5, raise the temperature to 120℃, connect a vacuum pump, and place under vacuum conditions to remove oligomers and by-products such as water and methanol generated during the reaction, so as to obtain modified silicone oil.

[0023] Preparation Example 1-4: The difference from Preparation Example 1-1 is that hydroxyethoxypropyl silicone oil is used to replace the modified silicone oil in an equal amount. 110g of hydrogen-containing silicone oil is mixed with 40g of allyl polyether, heated to 140°C, and nitrogen gas is introduced for 3 hours to remove water. After cooling to 90°C, 0.4g of isopropanol-chloroplatinic acid catalyst is added and kept at this temperature for 3 hours. The isopropanol-chloroplatinic acid catalyst is removed by diatomaceous earth adsorption and purification to obtain hydroxyethoxypropyl silicone oil, which is the modified silicone oil. The isopropanol-chloroplatinic acid catalyst is prepared by dissolving isopropanol in chloroplatinic acid.

[0024] Preparation Example 1-5: The difference from Preparation Example 1-1 is that hydroxyethoxypropyl silicone oil was not added. 20g KH-560, 12g dimethoxy(methyl)phenylsilane, and 10g decamethyltetrasiloxane were mixed evenly, heated to 90°C, stirred at 200 rpm for 20 min, tetrabutylammonium hydroxide was added, and the reaction was continued for 7 h. Glacial acetic acid was added to neutralize the tetrabutylammonium hydroxide, so that the pH of the reaction product was 7.5. The temperature was raised to 130°C, a vacuum pump was connected, and the product was placed under vacuum conditions to remove oligomers and byproducts such as water and methanol generated during the reaction, thus obtaining modified silicone oil.

[0025] Preparation Example 1-6: The difference from Preparation Example 1-1 is that tetrabutylammonium hydroxide was not added. (1) 110g of hydrogen-containing silicone oil and 40g of allyl polyether were mixed and heated to 140°C. Nitrogen gas was introduced for 3 hours to remove water. The temperature was then lowered to 90°C. 0.4g of isopropanol-chloroplatinic acid catalyst was added and kept warm for 3 hours. The isopropanol-chloroplatinic acid catalyst was removed by diatomaceous earth adsorption and purification to obtain hydroxyethoxypropyl silicone oil. The isopropanol-chloroplatinic acid catalyst was prepared by dissolving isopropanol in chloroplatinic acid. (2) Mix 110g of hydroxyethoxypropyl silicone oil, 20g of KH-560, 12g of dimethoxy(methyl)phenylsilane and 10g of decamethyltetrasiloxane evenly, heat to 90℃, stir at 200rpm for 20min, and continue the reaction for 7h. Then raise the temperature to 130℃, connect a vacuum pump, and place under vacuum conditions to remove oligomers and byproducts such as water and methanol generated during the reaction to obtain modified silicone oil. Preparation example of modified resin

[0026] Source of raw materials: Castor oil is selected from Guangdong Jinlong Chemical Import & Export Co., Ltd., and the product grade is industrial grade.

[0027] Preparation Example 2-1: (1) 10g N-methyldiethanolamine, 12g 1,4-butanediol and catalyst were mixed, and 52g isophorone diisocyanate was added dropwise at 50°C. The reaction was kept at the temperature for 3h to form a prepolymer with terminal isocyanate groups. The catalyst was bismuth neodecanoate. (2) Add 0.03g of p-hydroxyanisole and 10g of hydroxyethyl acrylate to the terminal isocyanate prepolymer, heat to 60℃ and react for 3h to obtain a semi-terminated prepolymer, add 10g of castor oil, heat to 80℃ and react for 7h, cool to 27℃, add 12g of 1,3-propanesulfonate lactone and 50g of methanol, react for 26h to obtain the modified resin.

[0028] Preparation Example 2-2: (1) 10g of N-methyldiethanolamine, 10g of 1,4-butanediol and catalyst were mixed, and 51g of isophorone diisocyanate was added dropwise at 45°C. The reaction was kept at the temperature for 2.5h to form a prepolymer with terminal isocyanate groups. The catalyst was bismuth neodecanoate. (2) Add 0.02g of p-hydroxyanisole and 8g of hydroxyethyl acrylate to the isocyanate-terminated prepolymer, heat to 55℃ and react for 2.5h to obtain a semi-terminated prepolymer, add 8g of castor oil, heat to 75℃ and react for 6.5h, cool to 26℃, add 11g of 1,3-propanesulfonate lactone and 45g of methanol, react for 25h to obtain the modified resin.

[0029] Preparation Example 2-3: (1) 10g N-methyldiethanolamine, 9g 1,4-butanediol and catalyst were mixed, and 50g isophorone diisocyanate was added dropwise at 40°C. The reaction was kept at the temperature for 2h to form a terminal isocyanate prepolymer. The catalyst was bismuth neodecanoate. (2) Add 0.01g of p-hydroxyanisole and 7g of hydroxyethyl acrylate to the isocyanate-terminated prepolymer, heat to 50℃ and react for 2h to obtain a semi-terminated prepolymer, add 7g of castor oil, heat to 70℃ and react for 6h, cool to 25℃, add 10g of 1,3-propanesulfonate lactone and 40g of methanol, react for 24h to obtain the modified resin.

[0030] Preparation Example 2-4: The difference from Preparation Example 1-1 is that N-methyldiethanolamine was not added. (1) 12g of 1,4-butanediol was mixed with the catalyst, and 52g of isophorone diisocyanate was added dropwise at 50°C. The reaction was kept warm for 3h to form a terminal isocyanate prepolymer. The catalyst was bismuth neodecanoate. (2) Add 0.03g of p-hydroxyanisole and 10g of hydroxyethyl acrylate to the terminal isocyanate prepolymer, heat to 60℃ and react for 3h to obtain a semi-terminated prepolymer, add 10g of castor oil, heat to 80℃ and react for 7h, cool to 27℃, add 12g of 1,3-propanesulfonate lactone and 50g of methanol, react for 26h to obtain the modified resin.

[0031] Preparation Example 2-5: The difference from Preparation Example 1-1 is that 1,3-propanesulfonate lactone was not added. (1) 10g of N-methyldiethanolamine, 12g of 1,4-butanediol and catalyst were mixed, and 52g of isophorone diisocyanate was added dropwise at 50°C. The reaction was kept warm for 3h to form a terminal isocyanate prepolymer. The catalyst was bismuth neodecanoate. (2) Add 0.03g of p-hydroxyanisole and 10g of hydroxyethyl acrylate to the terminal isocyanate prepolymer, heat to 60℃ and react for 3h to obtain a semi-terminated prepolymer, add 10g of castor oil, heat to 80℃ and react for 7h, cool to 27℃, add 50g of methanol and react for 26h to obtain the modified resin.

[0032] Preparation Example 2-6: The difference from Preparation Example 1-1 is that castor oil was not added. (1) 10g of N-methyldiethanolamine, 12g of 1,4-butanediol and catalyst were mixed, and 52g of isophorone diisocyanate was added dropwise at 50°C. The reaction was kept warm for 3h to form a prepolymer with terminal isocyanate groups. The catalyst was bismuth neodecanoate. (2) Add 0.03g of p-hydroxyanisole and 10g of hydroxyethyl acrylate to the terminal isocyanate prepolymer, heat to 60℃ and react for 3h to obtain a semi-terminated prepolymer, heat to 80℃ and react for 7h, cool to 27℃, add 12g of 1,3-propanesulfonate lactone and 50g of methanol, react for 26h to obtain the modified resin. Example

[0033] Source of raw materials: Ramie fiber is selected from Hualong Ramie Textile Products Co., Ltd. in Lu'an City, with product number 01; Vinylon is selected from Tai'an Haosong Fiber Co., Ltd., with model number PVA.

[0034] Example 1: A process for producing high-proportion dyed ramie vortex-spun yarn, comprising the following steps: (1) Raw material preparation: 70% ramie fiber and 30% vinylon; (2) Oiling treatment: Ramie fiber and vinylon were pre-cured for 4 days with a self-made oiling agent. The self-made oiling agent was composed of the following raw materials in the following mass percentages: 10% white vinegar, 5% soap powder, 3% modified silicone oil, 1.5% modified resin, 3% glycerin, and water to make up to 100%. The modified silicone oil was prepared in Preparation Example 1-1 and the modified resin was prepared in Preparation Example 2-1. (3) Blending and carding: The oiled ramie fibers are blended with vinylon and then carded to obtain cotton slivers; (4) Drawing: The cotton sliver is drawn through 3 drawing processes. The first drawing process has 6 slivers, a total draft ratio of 7, and a sliver output speed of 120m / min; the second drawing process has 8 slivers, a total draft ratio of 9, and a sliver output speed of 120m / min; the third drawing process has 8 slivers, a total draft ratio of 9, and a sliver output speed of 120m / min, to obtain a finished sliver. (5) Vortex spinning: The sliver is drawn, gathered, twisted, and wound into shape to obtain a high proportion of colored ramie vortex spun yarn with a draw ratio of 45 times, a vortex nozzle air pressure of 0.4 MPa, and a winding speed of 450 m / min.

[0035] Example 2: A process for producing high-proportion dyed ramie vortex-spun yarn, comprising the following steps: (1) Raw material preparation: 72% ramie fiber and 28% vinylon; (2) Oiling treatment: Ramie fiber and vinylon were pre-cured for 3 days with a self-made oiling agent. The self-made oiling agent was composed of the following raw materials in the following mass percentages: white vinegar 8%, soap powder 4%, modified silicone oil 2%, modified resin 1.0%, glycerin 2%, and water to make up to 100%. The modified silicone oil was prepared in Preparation Example 1-2, and the modified resin was prepared in Preparation Example 2-2. (3) Blending and carding: The oiled ramie fibers are blended with vinylon and then carded to obtain cotton slivers; (4) Drawing: The cotton sliver is drawn through 3 drawing processes. The first drawing process has 6 slivers, the total draft ratio is 6 times, and the sliver output speed is 120m / min; the second drawing process has 8 slivers, the total draft ratio is 8 times, and the sliver output speed is 120m / min; the third drawing process has 8 slivers, the total draft ratio is 8 times, and the sliver output speed is 120m / min, to obtain a finished sliver. (5) Vortex spinning: The sliver is drawn, gathered, twisted, and wound into shape to obtain a high proportion of colored ramie vortex spun yarn with a draw ratio of 45 times, a vortex nozzle air pressure of 0.4 MPa, and a winding speed of 450 m / min.

[0036] Example 3: A process for producing high-proportion dyed ramie vortex-spun yarn, comprising the following steps: (1) Raw material preparation: 73% ramie fiber and 27% vinylon; (2) Oiling treatment: Ramie fiber and vinylon were pre-soaked for 2 days with a self-made oiling agent. The self-made oiling agent was composed of the following raw materials in the following mass percentages: white vinegar 6%, soap powder 3%, modified silicone oil 1.5%, modified resin 0.9%, glycerin 1.5%, and water to make up to 100%. The modified silicone oil was prepared from preparation examples 1-3, and the modified resin was prepared from preparation examples 2-3. (3) Blending and carding: The oiled ramie fibers are blended with vinylon and then carded to obtain cotton slivers; (4) Drawing: The cotton sliver is drawn through 3 drawing processes. The first drawing process has 6 slivers, a total draft ratio of 6, and a sliver output speed of 120m / min; the second drawing process has 8 slivers, a total draft ratio of 7, and a sliver output speed of 120m / min; the third drawing process has 8 slivers, a total draft ratio of 7, and a sliver output speed of 120m / min, to obtain a finished sliver. (5) Vortex spinning: The sliver is drawn, gathered, twisted, and wound into shape to obtain a high proportion of colored ramie vortex spun yarn with a draw ratio of 45 times, a vortex nozzle air pressure of 0.4 MPa, and a winding speed of 450 m / min.

[0037] Example 4: A process for producing high-proportion dyed ramie vortex-spun yarn, comprising the following steps: (1) Raw material preparation: 75% ramie fiber and 25% vinylon; (2) Oiling treatment: Ramie fiber and vinylon were pre-cured for 2 days with a self-made oiling agent. The self-made oiling agent was composed of the following raw materials in the following mass percentages: 5% white vinegar, 2% soap powder, 1% modified silicone oil, 0.8% modified resin, 1% glycerin, and water to make up to 100%. The modified silicone oil was prepared in Preparation Example 1-1 and the modified resin was prepared in Preparation Example 2-1. (3) Blending and carding: The oiled ramie fibers are blended with vinylon and then carded to obtain cotton slivers; (4) Drawing: The cotton sliver is drawn through two drawing processes. The first drawing process has 6 slivers, the total draft ratio is 6 times, and the sliver output speed is 120m / min. The second drawing process has 8 slivers, the total draft ratio is 7 times, and the sliver output speed is 120m / min, to obtain a finished sliver. (5) Vortex spinning: The sliver is drawn, gathered, twisted, and wound into shape to obtain a high proportion of colored ramie vortex spun yarn with a draw ratio of 45 times, a vortex nozzle air pressure of 0.4 MPa, and a winding speed of 450 m / min.

[0038] Example 5: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the modified silicone oil is prepared using Examples 1-4.

[0039] Example 6: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the modified silicone oil is prepared using Examples 1-5.

[0040] Example 7: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the modified silicone oil is prepared using Examples 1-6.

[0041] Example 8: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the silicone oil is not modified.

[0042] Example 9: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the modified resin is prepared using Examples 2-4.

[0043] Example 10: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the modified resin is prepared using Preparation Examples 2-5.

[0044] Example 11: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the modified resin is prepared using Preparation Examples 2-6.

[0045] Example 12: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the self-made oiling agent does not contain modified silicone oil.

[0046] Example 13: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the self-made oiling agent does not contain modified resin. Comparative Example

[0047] Comparative Example 1: A process for producing high-proportion dyed ramie vortex-spun yarn, which differs from Example 1 in that the ramie fibers and vinylon were not pre-cured with a self-made oiling agent. Performance testing

[0048] High-ratio colored ramie vortex-spun yarns were prepared according to the methods in the examples and comparative examples, and their performance was tested according to the following methods. The test data are recorded in Table 1.

[0049] 1. Breaking strength: The breaking strength of the sample was determined in accordance with GB / T 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles".

[0050] 2. Yarn evenness: The test was conducted in accordance with the standard GB / T 3292.1-2008 "Textiles - Test methods for yarn evenness - Part 1: Capacitance method" using a YG139 BA yarn evenness tester. The main test indicators included CV, fineness, thickness, and neps. The test speed was 100m / min, and a total of 400m of yarn was tested in 4 test units. The average value of 3 tests was taken for each sample.

[0051] 2. Hairiness: The hairiness of recycled wool yarn was measured according to standard FZ / T 01086-2020 "Textile Yarn Hairiness Determination Method - Projection Counting Method". A YG173 A type yarn hairiness tester was used at 20℃ and 65% relative humidity. The pre-tension was 0.25 cN / tex, the yarn segment length for hairiness testing was 10 m, and the testing speed was 30 m / min. The average value of 10 tests was taken for each sample.

[0052] Table 1. Test data of high-proportion dyed ramie vortex-spun yarn Testing items Fracture strength CV% of the strip Details -50% Thick section +50% Cotton knots +200% Hairiness Example 1 11.8 19.71 240 550 650 1.33 Example 2 11.6 20.32 250 560 655 1.35 Example 3 11.5 20.85 270 565 662 1.38 Example 4 11.1 21.45 280 570 670 1.41 Example 5 10.2 23.78 320 610 712 1.66 Example 6 10.5 23.28 310 600 705 1.61 Example 7 10.7 23.13 305 590 700 1.55 Example 8 9.8 24.30 334 627 718 1.70 Example 9 10.3 23.60 315 604 708 1.62 Example 10 10.1 23.96 324 613 715 1.69 Example 11 10.9 23.01 300 580 690 1.50 Example 12 7.5 25.75 356 646 747 1.85 Example 13 8.3 25.28 345 635 733 1.82 Comparative Example 1 6.2 27.44 368 655 769 1.97 As can be seen from Examples 1-4 and Table 1, the process method for high-proportion dyed ramie vortex spinning yarn provided in this application significantly improves the spinning performance of ramie raw materials.

[0053] Combining Examples 1 and 5-7 with Table 1, it can be seen that the spinning performance of Examples 5-7 is reduced compared to Example 1. This indicates that the Si-OH of hydroxyethoxypropyl silicone oil undergoes a de-alcoholization condensation reaction with KH-560 and the Si-OR of dimethoxy(methyl)phenylsilane under the catalysis of tetrabutylammonium hydroxide to generate a siloxane backbone. The siloxane backbone can provide lubrication, reduce the friction coefficient between ramie fibers, and enhance the cohesion between fibers.

[0054] Combining Examples 1 and 9-11 with Table 1, it can be seen that the spinning performance of Examples 9-10 is reduced compared to Example 1. N-methyldiethanolamine and 1,4-butanediol are hydroxyl components containing dihydroxyl and tertiary amine groups. Through esterification and castor oil chain extension, a polyurethane backbone can be constructed. The polyurethane backbone can form a dense film on the surface of ramie fibers. The film forms strong hydrogen bonds with the hydroxyl groups on the ramie surface, forming a strong interfacial bond. The dispersed single fibers are slightly bonded together by the film, which not only improves the cohesion between fibers, but also reduces the breakage rate during carding and drafting, and improves the spinnability of the raw material.

[0055] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A process for producing high-proportion dyed ramie vortex-spun yarn, characterized in that, Includes the following steps: (1) Raw material preparation: 70%-75% ramie fiber and 20%-35% vinylon; (2) Oiling treatment: Pre-soak ramie fibers and vinylon with a homemade oiling agent for 2-4 days; (3) Blending and carding: The oiled ramie fibers are blended with vinylon and then carded to obtain cotton slivers; (4) Drawing: The cotton sliver is drawn through 2-3 drawing processes. The first drawing process has 6 slivers and a total draft ratio of 6-7 times. The second drawing process has 8 slivers and a total draft ratio of 7-9 times. The third drawing process has 8 slivers and a total draft ratio of 7-9 times, to obtain a finished sliver. (5) Vortex spinning: The sliver is drawn, gathered, twisted, and wound into shape to obtain a high proportion of colored ramie vortex spun yarn.

2. The process for producing high-proportion dyed ramie vortex-spun yarn according to claim 1, characterized in that, The homemade oil contains the following raw materials in weight percentages: White vinegar 5%-10%, soap powder 2%-5%, modified silicone oil 1%-3%, modified resin 0.8%-1.5%, glycerin 1%-3%, water to make up to 100%.

3. The process for producing high-proportion dyed ramie vortex-spun yarn according to claim 2, characterized in that, The method for preparing the modified silicone oil includes the following steps: (1) After mixing hydrogen-containing silicone oil with allyl polyether, the temperature is raised to 120-140℃, nitrogen is introduced for 2-3 hours to remove water, and then the temperature is lowered to 80-90℃. Isopropanol-chloroplatinic acid catalyst is added and kept warm for 2-3 hours. Isopropanol-chloroplatinic acid catalyst is removed by diatomaceous earth adsorption and purification to obtain hydroxyethoxypropyl silicone oil. The mass ratio of hydrogen-containing silicone oil, allyl polyether and isopropanol-chloroplatinic acid catalyst is 100-110:38-40:0.2-0.

4. (2) Mix hydroxyethoxypropyl silicone oil, KH-560, dimethoxy(methyl)phenylsilane and decamethyltetrasiloxane evenly, heat to 80-90℃, stir, add tetrabutylammonium hydroxide, continue the reaction for 6-7h, add glacial acetic acid to neutralize tetrabutylammonium hydroxide, make the reaction pH 6.5-7.5, raise the temperature to 120-130℃, remove byproducts under vacuum, and obtain modified silicone oil.

4. The process for producing high-proportion dyed ramie vortex-spun yarn according to claim 3, characterized in that, The mass ratio of hydroxyethoxypropylsilane, KH-560, dimethoxy(methyl)phenylsilane to decamethyltetrasiloxane is 100-110:15-20:10-12:8-10.

5. The process for producing high-proportion dyed ramie vortex-spun yarn according to claim 2, characterized in that, The method for preparing the modified resin includes the following steps: (1) Mix N-methyldiethanolamine, 1,4-butanediol and catalyst, add isophorone diisocyanate dropwise at 40-50℃, keep warm for 2-3h to form isocyanate-terminated prepolymer; (2) Add p-hydroxyanisole and hydroxyethyl acrylate to the terminal isocyanate prepolymer, heat to 50-60℃ and react for 2-3 hours to obtain a semi-terminated prepolymer, add castor oil, heat to 70-80℃ and react for 6-7 hours, cool to 25-27℃, add 1,3-propanesulfonate lactone and methanol, and react for 24-26 hours to obtain the modified resin.

6. The process for producing high-proportion dyed ramie vortex-spun yarn according to claim 5, characterized in that, The mass ratio of N-methyldiethanolamine, 1,4-butanediol and isophorone diisocyanate is 10:9-12:50-52.

7. The process method for producing high-proportion dyed ramie vortex-spun yarn according to claim 5, characterized in that, The mass ratio of p-hydroxyanisole, hydroxyethyl acrylate, castor oil, 1,3-propanesulfonate lactone, and methanol is 0.01-0.03:7-10:7-10:10-12:40-50.

8. The process method for producing high-proportion dyed ramie vortex-spun yarn according to claim 5, characterized in that, The catalyst is one or both of bismuth neodecanoate and bismuth isooctanoate.