A pure polyester two-tone chenille yarn and its preparation process

Abstract

This application belongs to the field of textile technology and discloses a pure polyester two-tone chenille yarn and its preparation process. The preparation process of the pure polyester two-tone chenille yarn in this application includes the following steps: (1) preparing core yarn and pile yarn; (2) cutting and twisting to obtain finished yarn; (3) performing two dyeing and color fixing processes in sequence to obtain pure polyester two-tone chenille yarn. The raw materials of the chenille yarn obtained in this application are all replaced by polyester fibers, and a similar fluffy and soft hand feel can be obtained. At the same time, in the dyeing process, the pure polyester two-tone chenille yarn dyed by the two-bath dyeing method has a more vivid color contrast between the core yarn and the pile yarn, the color is more bright, the color fastness is higher, and the tensile strength and reliability of the chenille yarn are maintained as much as possible.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to a pure polyester two-color chenille yarn and its preparation process. Background Technology

[0002] Polyester fiber is a hydrophobic synthetic fiber with high crystallinity and only small voids within it. At low temperatures, the molecular thermal motion causes minimal changes in position. Under humid conditions, polyester fibers do not expand their voids through vigorous swelling like cotton fibers, making it difficult for dye molecules to penetrate the fiber interior. Polyester fibers lack functional groups that can bind with direct dyes, acid dyes, and basic dyes. Although it possesses ester groups that can form hydrogen bonds with disperse dyes, the tight molecular chain structure of polyester makes it difficult for dye molecules to enter the fiber interior, resulting in dyeing difficulties, monotonous colors, and directly impacting the development of various colors and patterns for polyester fabrics.

[0003] Chenille yarn, also known as corduroy or plush yarn, is a fancy yarn characterized by its full, fluffy, soft hand feel and vibrant colors. Fabrics woven from chenille are thick yet lightweight, making it widely used in home textiles, woven and knitted garments, automotive accessories, and antique-style fabrics, among other applications, and highly popular. Using polyester fibers as both the core and pile yarns in chenille yarn results in 100% polyester chenille fabric that is less prone to shedding and retains its original feel and style. Currently, the colors of chenille yarns on the market are relatively limited, resulting in limited variation in patterns and colors for chenille fabrics. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems, and to achieve two colors on a single yarn while simplifying the production process, resulting in better dyeing effect and more vivid contrast between the two colors, this application provides a pure polyester two-color chenille yarn and its preparation process.

[0005] In a first aspect, this application provides a process for preparing pure polyester two-tone chenille yarn, comprising the following steps:

[0006] S1. Prepare the core yarn and the fleece yarn. The core yarn is made of hydrophobic modified polyester fiber, and the fleece yarn is made of cationic modified polyester filament.

[0007] S2. Four core yarns are fed into the spinning machine at a linear speed of 10-16 m / min under the traction of the rollers. Under the action of the rollers and spacers, the yarn is cut into short feathers by the blades. The short feathers are clamped between the core yarns, and as the spindle rotates, the core yarns and the short feathers are twisted in an S-twist with a twist of 350-500 T / m to obtain a semi-finished yarn.

[0008] S3. Take 2-5 semi-finished yarns obtained in step S2 and twist them into one strand using a plying machine. The twisting process includes two twisting steps: a first twist and a second twist. The two twisting steps are performed alternately to obtain the finished yarn.

[0009] S4. Prepare the first dyeing solution and immerse the finished yarn obtained in step S3 in the first dyeing solution. Add glacial acetic acid to adjust the pH value of the first dyeing solution to 4.5-5.5, and perform dyeing. Dye at 70-90℃ for 80-120 minutes, wash in sodium carbonate solution, and rinse in clean water to obtain single-color finished yarn.

[0010] S5. Prepare a second dyeing solution and immerse the single-color finished yarn obtained in step S4 in the second dyeing solution. Let it stand at room temperature for 30-50 minutes and dry it at 90-130℃ for 5-10 minutes to obtain a two-color finished yarn.

[0011] S6. The two-color finished yarn obtained in step S5 is steamed with a color-fixing liquid for 2-3 hours, cooled to room temperature, rinsed in clean water, and dried to obtain pure polyester two-color chenille yarn.

[0012] By adopting the above technical solution, this application uses two polyester fibers of different materials and modifies the two polyester fibers to obtain hydrophobic modified polyester macrofiber and cationic modified polyester filament, which are then spun into chenille yarn and dyed twice. By applying different degrees of adhesion of the two dyes, two colors are formed in one yarn.

[0013] Optionally, in step S1, the preparation method of the hydrophobic modified polyester macrofiber includes the following steps:

[0014] (1) Pretreatment: Add polyester macrofiber to 90wt% phosphoric acid solution and immerse for 20-30 min, dry at 130℃ for 5-10 min, then immerse in 90wt% phosphoric acid solution for 10-20 min, and dry at 130℃ for 5-10 min.

[0015] (2) Tetrabutyl titanate was added to anhydrous ethanol, nano-silica, deionized water and pretreated polyester macrofiber were added, and the reaction was carried out while stirring. The reaction was carried out at 110°C for 1-2 hours. The polyester macrofiber was taken out and dried, immersed in hexadecyl dimethyl chlorosilane liquid, and dried to obtain the hydrophobic modified polyester macrofiber. The weight ratio of the polyester macrofiber, anhydrous ethanol, tetrabutyl titanate, nano-silica, deionized water and hexadecyl dimethyl chlorosilane was 6-12:15-25:1-2.5:1-2:50-70:10.

[0016] By employing the above technical solution, polyester macrofiber is pretreated with a phosphoric acid solution. At high temperature, the phosphoric acid solution adhering to the surface of the polyester macrofiber is gradually concentrated, resulting in phosphorylation modification. The phosphoric acid-modified polyester macrofiber surface gains P-OH groups, becoming rougher and forming microgrooves and detached layers in localized areas. Following pretreatment, nano-titanium dioxide and nano-silica particles are loaded onto the polyester macrofiber surface using a hydrothermal method. Simultaneously, silica sol is used to chemically bond with active groups such as hydroxyl groups on the polyester macrofiber surface, causing the silica sol, nano-titanium dioxide particles, and nano-silica particles to adsorb onto the fiber, forming a rough, porous surface structure with good hydrophobicity. This enhances the anti-aging and UV resistance of the core yarn made from the polyester macrofiber. Finally, hexadecyl dimethylchlorosilane is used for finishing, causing long-chain alkyl groups to be branched onto the surface of the silica and titanium dioxide nanoparticles, thereby producing a stable hydrophobic and oleophilic effect.

[0017] Optionally, the polyester macrofiber is 16N polyester macrofiber.

[0018] Optionally, the cationic modified polyester filament is a 150D-600D96F-288F low-elasticity yarn, which includes one or more of the following: 150D96F low-elasticity yarn, 150D144F low-elasticity yarn, 150D188F low-elasticity yarn, 150D288F low-elasticity yarn, 300D96F low-elasticity yarn, 300D144F low-elasticity yarn, 300D188F low-elasticity yarn, 300D288F low-elasticity yarn, 600D96F low-elasticity yarn, 600D144F low-elasticity yarn, 600D188F low-elasticity yarn, and 600D288F low-elasticity yarn.

[0019] By adopting the above technical solution, the combination of four 16N all-polyester synthetic fibers for the core yarn and one 60D-600D96F-288F low-elasticity yarn for the fleece yarn can effectively increase the micropores of the yarn, making the yarn softer, smoother, and fuller in hand, increasing the yarn's warmth retention, and improving the grade and comfort of the yarn fabric; it can also effectively improve the tensile strength and pull-out resistance of the core yarn, making the twisting stability of the yarn in the core yarn clamping more stable and reliable.

[0020] Optionally, in step S3, the first twisting has a twist of 85-120 T / m, a linear speed of 4-10 m / min, and a twisting time of 3-5 min; the second twisting has a twist of 200-250 T / m, a linear speed of 14-18 m / min, and a twisting time of 1-3 min.

[0021] By adopting the above technical solution and using two twisting processes, the resulting chenille yarn has better elasticity, which can effectively improve the tensile strength and pull-out resistance of the core yarn, making the yarn more stable and reliable.

[0022] Optionally, in step S4, the first dyeing solution comprises the following raw materials in parts by weight: 5-10 parts cationic dye, 0.3-0.8 parts of Pingpingjia O, 0.3-0.9 parts of penetrant JFC, 0.6-1.2 parts of sodium methylene dimethylnaphthalene sulfonate, and 120-160 parts of water.

[0023] Optionally, in step S4, the bath ratio of the finished yarn to the first dye liquor is 1:25-40.

[0024] Optionally, the cationic dye is selected from one or more of the following: cationic red X-GRL, cationic brilliant red X-5GN, cationic yellow X-3RL, cationic golden yellow X-GL, cationic blue X-GRL, cationic blue X-BL, and cationic turquoise blue X-GB.

[0025] By adopting the above technical solution, during the dyeing process, cationic dyes bind to the anionic groups on the cationic modified polyester through ionic bonds, thereby achieving the dyeing of the polyester. The cationic modified polyester has high selectivity and adsorption for cationic dyes, and can effectively adsorb and dye them, thus achieving the dyeing of short-haired yarn. At the same time, the hydrophobic structure and long-chain alkyl groups on the surface of the hydrophobic modified polyester macrofiber have no adsorption effect on cationic dyes, thus the adsorption effect of cationic dyes on the core yarn is small. The finished yarn is dyed by treating the short-haired yarn in the first dyeing liquor, thereby obtaining a single-color finished yarn.

[0026] Optionally, in step S5, the second dye solution comprises the following raw materials in parts by weight: 10-20 parts of oil-soluble dye, 8-15 parts of ethanol, 2-5 parts of isopropanol, 2-8 parts of sulfated castor oil, and 60-90 parts of water.

[0027] Optionally, in step S5, the ratio of the finished monochrome yarn to the second dye liquor is 1:20-35.

[0028] Optionally, the oil-soluble dye is an anthraquinone dye or a heterocyclic dye, selected from one or more of the following: yellow GG dye, red G dye, red EG dye, red BB dye, blue 2RA dye, purple BA dye, green G dye, and brown R dye.

[0029] By adopting the above technical solution, the second dyeing solution is an emulsion system, which reduces the hydrophilicity of oil-soluble dyes. When the finished single-color yarn is immersed in the emulsion system, an oil film will form on the surface of the highly hydrophilic short fibers, which will have a certain protective effect on the dyed short fibers. After the oil-soluble dye is dyed and dried on the surface of the core yarn, it will completely break down and has good wet rubbing fastness. Therefore, using an emulsion system in the second dyeing solution can effectively improve the wet rubbing fastness of the core yarn.

[0030] Secondly, this application provides pure polyester two-color chenille yarn prepared by the above-mentioned pure polyester two-color chenille yarn preparation process.

[0031] In summary, the present invention has at least one of the following beneficial technical effects:

[0032] 1. The raw materials of the chenille yarn obtained in this application are all replaced by inexpensive polyester fibers, and a similar fluffy and soft hand feel can be obtained. At the same time, in the dyeing process, the pure polyester two-color chenille yarn dyed by the two-bath method has a more vivid color contrast between the core yarn and the pile yarn, the color is more bright, the color fastness is higher, and the tensile strength and reliability of the chenille yarn are maintained as much as possible.

[0033] 2. Although the preparation process of pure polyester two-color chenille yarn in this application adopts the two-bath method, which has more steps than the single-bath method, the dyeing effect is significantly stronger than the single-bath method, and the overall processing time is shorter. The operation during the dyeing process is simple and the raw material cost is lower. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the embodiments.

[0035] This application designs a preparation process for pure polyester two-tone chenille yarn, including the following steps:

[0036] S1. Prepare the core yarn and the fleece yarn. The core yarn is made of hydrophobic modified polyester fiber, and the fleece yarn is made of cationic modified polyester filament.

[0037] S2. Four core yarns are fed into the spinning machine at a linear speed of 10-16 m / min under the traction of the rollers. Under the action of the rollers and spacers, the yarn is cut into short feathers by the blades. The short feathers are clamped between the core yarns, and as the spindle rotates, the core yarns and the short feathers are twisted in an S-twist with a twist of 350-500 T / m to obtain a semi-finished yarn.

[0038] S3. Take 2-5 semi-finished yarns obtained in step S2 and twist them into one strand using a plying machine. The twisting process includes two twisting steps: a first twist and a second twist. The two twisting steps are performed alternately to obtain the finished yarn.

[0039] S4. Prepare the first dyeing solution and immerse the finished yarn obtained in step S3 in the first dyeing solution. Add glacial acetic acid to adjust the pH value of the first dyeing solution to 4.5-5.5, and perform dyeing. Dye at 70-90℃ for 80-120 minutes, wash in sodium carbonate solution, and rinse in clean water to obtain single-color finished yarn.

[0040] S5. Prepare a second dyeing solution and immerse the single-color finished yarn obtained in step S4 in the second dyeing solution. Let it stand at room temperature for 30-50 minutes and dry it at 90-130℃ for 5-10 minutes to obtain a two-color finished yarn.

[0041] S6. The two-color finished yarn obtained in step S5 is steamed with a color-fixing liquid for 2-3 hours, cooled to room temperature, rinsed in clean water, and dried to obtain pure polyester two-color chenille yarn.

[0042] This application designs a pure polyester two-color chenille yarn prepared by the above-mentioned pure polyester two-color chenille yarn preparation process.

[0043] The technical problem addressed by this application is that the colors of chenille yarns currently on the market are relatively limited, resulting in limited color variations in chenille fabric patterns. Furthermore, chenille yarns made from polyester are difficult to dye, resulting in monotonous colors. This application utilizes hydrophobic modified polyester macrofiber for the core yarn and cationic modified polyester filament for the pile yarn. Through specific spinning and dyeing processes, a pure polyester two-color chenille yarn is produced that achieves a similar fluffy and soft hand feel to conventional chenille yarn. Simultaneously, the two-bath dyeing process results in a more vivid color contrast between the core and pile yarns, leading to brighter colors, higher color fastness, and while maintaining the tensile strength and reliability of the chenille yarn as much as possible. The dyeing process in this application is simple to operate and has lower raw material costs.

[0044] The raw materials used in the embodiments of this application are all commercially available, and the specific sources of the raw materials are as follows:

[0045] 16N polyester fiber, Weifang Huafeng Co., Ltd.

[0046] 150D-600D96F-288F low-elasticity yarn, Taicang Ximei Chemical Fiber Co., Ltd.;

[0047] Tetrabutyl titanate, Sigma-Aldrich (Shanghai) Trading Co., Ltd.;

[0048] Hexadecyl dimethylchlorosilane, Hubei Kefule Materials Technology Co., Ltd.;

[0049] Cationic Turquoise Blue X-GB, Cationic Brilliant Red X-5GN, Cationic Blue X-GRL, Cationic Golden Yellow X-GL, Hangzhou Rongcai Industrial Co., Ltd.;

[0050] Pingpingjia O, Sanda Chemical (Nantong) Co., Ltd.;

[0051] JFC penetrant, Zhejiang Huangma New Material Technology Co., Ltd.;

[0052] Sodium methylene dimethylnaphthalene sulfonate, Shanghai Jinjinle Industrial Co., Ltd.;

[0053] Green G dye, Yellow GG dye, Anhui Jingzhicai New Materials Co., Ltd.;

[0054] Sulfated castor oil, Nanjing Kangmanlin Chemical Industry Co., Ltd.

[0055] Example 1

[0056] The preparation process of pure polyester two-tone chenille yarn in Example 1 includes the following steps:

[0057] S1. Prepare the core yarn and the fleece yarn. The core yarn is made of hydrophobic modified polyester fiber, and the fleece yarn is made of cationic modified polyester filament. The polyester fiber is made of 16N polyester fiber, and the cationic modified polyester filament is made of 300D144F low elasticity yarn.

[0058] S2. Four core yarns are fed into the spinning machine at a linear speed of 12m / min under the traction of the rollers. Under the action of the rollers and spacers, the yarn is cut into short feathers by the blades. The short feathers are clamped between the core yarns, and as the spindle rotates, the core yarns and the short feathers are twisted in an S-twist with a twist of 400T / m to obtain a semi-finished yarn.

[0059] S3. The three semi-finished yarns obtained in step S2 are twisted into a single strand by a plying machine using a Z-twist process. The Z-twist process includes two twisting steps: a first twist and a second twist. The two twisting steps are performed alternately to obtain the finished yarn. The twist of the first twist is 110T / m, the linear speed is 8m / min, and the twisting time is 4min. The twist of the second twist is 240T / m, the linear speed is 16m / min, and the twisting time is 2min.

[0060] S4. Prepare the first dyeing solution, with the following specific proportions by weight: 9 parts cationic dye, 0.6 parts leveling agent O, 0.4 parts penetrant JFC, 1 part sodium methylene dimethylnaphthalene sulfonate, and 130 parts water; immerse the finished yarn obtained in step S3 in the first dyeing solution, with a bath ratio of 1:30 between the finished yarn and the first dyeing solution; add glacial acetic acid to adjust the pH value to approximately 5, dye at 85°C for 110 minutes, then wash in sodium carbonate solution (3g / L) and rinse in clean water to obtain a single-color finished yarn; wherein, the cationic dye selected is cationic turquoise blue X-GB.

[0061] S5. Prepare the second dyeing solution, with the following specific proportions by weight: 14 parts oil-soluble dye, 13 parts ethanol, 3 parts isopropanol, 5 parts sulfated castor oil, and 80 parts water; immerse the single-color finished yarn obtained in step S4 in the second dyeing solution, with a bath ratio of 1:25 between the single-color finished yarn and the second dyeing solution; let it stand at room temperature for 40 minutes, and then dry it at 100°C for 5 minutes to obtain the two-color finished yarn; wherein, the oil-soluble dye is Green G dye.

[0062] S6. The two-color finished yarn obtained in step S5 is steamed at 110℃ for 2 hours with a color-fixing solution, cooled to room temperature, rinsed in clean water, and dried to obtain pure polyester two-color chenille yarn; the color-fixing solution is prepared with the following ratio: color-fixing agent 3g / L, glacial acetic acid 1.5g / L, and water as the solvent.

[0063] The preparation of hydrophobically modified polyester macrofiber in step S1 includes the following steps:

[0064] (1) Pretreatment: Add polyester macrofiber to 90wt% phosphoric acid solution and immerse for 20min, dry at 130℃ for 5min, then immerse in 90wt% phosphoric acid solution for 10min, dry at 130℃ for 5min, and set aside.

[0065] (2) Tetrabutyl titanate was added to anhydrous ethanol, nano-silica, deionized water and pretreated polyester macrofiber were added, and the reaction was carried out while stirring. The reaction was carried out at 110°C for 1.5 h. The polyester macrofiber was taken out and dried, immersed in hexadecyl dimethyl chlorosilane liquid, and dried to obtain the hydrophobic modified polyester macrofiber. The weight ratio of the polyester macrofiber, anhydrous ethanol, tetrabutyl titanate, nano-silica, deionized water and hexadecyl dimethyl chlorosilane was 10:20:2:1.5:55:10.

[0066] Example 2

[0067] The preparation process of pure polyester two-color chenille yarn in Example 2 is based on Example 1, except that step S4 and step S5 in Example 2 are different.

[0068] Step S4 in Example 2 becomes:

[0069] S4. Prepare the first dyeing solution, with the following specific proportions by weight: 5 parts cationic dye, 0.3 parts leveling agent O, 0.3 parts penetrant JFC, 0.6 parts sodium methylene dimethylnaphthalene sulfonate, and 120 parts water; immerse the finished yarn obtained in step S3 in the first dyeing solution, with a bath ratio of 1:40 between the finished yarn and the first dyeing solution; add glacial acetic acid to adjust the pH value to approximately 5, dye at 70°C for 120 minutes, then wash in sodium carbonate solution (3g / L) and rinse in clean water to obtain a single-color finished yarn; wherein, the cationic dyes selected are cationic brilliant red X-5GN and cationic blue X-GRL with a weight ratio of 1:1.

[0070] Step S5 in Example 2 becomes:

[0071] S5. Prepare the second dyeing solution, with the following specific proportions by weight: 10 parts oil-soluble dye, 8 parts ethanol, 2 parts isopropanol, 2 parts sulfated castor oil, and 90 parts water; immerse the single-color finished yarn obtained in step S4 in the second dyeing solution, with a bath ratio of 1:35 between the single-color finished yarn and the second dyeing solution; let it stand at room temperature for 50 minutes, and then dry it at 100°C for 5 minutes to obtain the two-color finished yarn; wherein, the oil-soluble dye is selected as Yellow GG dye.

[0072] Example 3

[0073] The preparation process of pure polyester two-color chenille yarn in Example 3 is based on Example 1, except that step S4 and step S5 in Example 3 are different.

[0074] Step S4 in Example 3 becomes:

[0075] S4. Prepare the first dyeing solution, with the following specific proportions by weight: 10 parts cationic dye, 0.8 parts leveling agent O, 0.9 parts penetrant JFC, 1.2 parts sodium methylene dimethylnaphthalene sulfonate, and 160 parts water; immerse the finished yarn obtained in step S3 in the first dyeing solution, with a bath ratio of 1:40 between the finished yarn and the first dyeing solution; add glacial acetic acid to adjust the pH value to approximately 5, dye at 90°C for 80 minutes, then wash in sodium carbonate solution (3g / L) and rinse in clean water to obtain a single-color finished yarn; wherein, the cationic dye selected is cationic golden yellow X-GL.

[0076] Step S5 in Example 3 becomes:

[0077] S5. Prepare the second dyeing solution, with the following specific proportions by weight: 20 parts oil-soluble dye, 15 parts ethanol, 5 parts isopropanol, 8 parts sulfated castor oil, and 60 parts water; immerse the single-color finished yarn obtained in step S4 in the second dyeing solution, with a bath ratio of 1:20 between the single-color finished yarn and the second dyeing solution; let it stand at room temperature for 30 minutes, and then dry it at 100°C for 5 minutes to obtain the two-color finished yarn; wherein, the oil-soluble dye selected is Yellow GG dye.

[0078] Examples 4-5

[0079] The preparation process of pure polyester two-color chenille yarn in Example 4 is based on Example 1, except that the cationic modified polyester filament in Example 4 is 600D288F low elastic yarn.

[0080] The preparation process of pure polyester two-color chenille yarn in Example 5 is based on Example 1, except that the cationic modified polyester filament in Example 5 is 150D96F low elastic yarn.

[0081] Example 6

[0082] The preparation process of pure polyester two-tone chenille yarn in Example 6 is based on Example 1, with the difference being that no pretreatment is performed during the preparation of hydrophobically modified polyester macrofiber in Example 6. That is, the preparation of hydrophobically modified polyester macrofiber includes the following steps: tetrabutyl titanate is added to anhydrous ethanol, nano-silica, deionized water and polyester macrofiber are added, and the reaction is carried out while stirring. The reaction is carried out at 110°C for 1.5 hours. The polyester macrofiber is taken out and dried, immersed in hexadecyl dimethylchlorosilane liquid, and dried to obtain the hydrophobically modified polyester macrofiber. The weight ratio of the polyester macrofiber, anhydrous ethanol, tetrabutyl titanate, nano-silica, deionized water and hexadecyl dimethylchlorosilane is 10:20:2:1.5:55:10.

[0083] Example 7

[0084] The preparation process of pure polyester two-tone chenille yarn in Example 7 is based on Example 1, except that: in the preparation of hydrophobically modified polyester macrofiber in Example 7, hexadecyl dimethylchlorosilane is not used to treat the polyester macrofiber. That is, the preparation of hydrophobically modified polyester macrofiber includes the following steps:

[0085] (1) Pretreatment: Add polyester macrofiber to 90wt% phosphoric acid solution and immerse for 20min, dry at 130℃ for 5min, then immerse in 90wt% phosphoric acid solution for 10min, dry at 130℃ for 5min, and set aside.

[0086] (2) Tetrabutyl titanate was added to anhydrous ethanol, nano-silica, deionized water and pretreated polyester macrofiber were added, and the reaction was carried out while stirring. The reaction was carried out at 110°C for 1.5 h. The polyester macrofiber was taken out and dried to obtain the hydrophobic modified polyester macrofiber. The weight ratio of the polyester macrofiber, anhydrous ethanol, tetrabutyl titanate, nano-silica and deionized water was 10:20:2:1.5:55.

[0087] Comparative Example 1

[0088] The preparation process of pure polyester two-color chenille yarn in Comparative Example 1 is based on Example 1, except that the core yarn in Comparative Example 1 is made of polyester macro-fiber and is not subjected to hydrophobic modification treatment.

[0089] Comparative Example 2

[0090] The preparation process of pure polyester two-tone chenille yarn in Comparative Example 2 is based on Example 1, except that the order of steps S4 and S5 in the preparation process of pure polyester two-tone chenille yarn in Comparative Example 2 is replaced. The preparation process of pure polyester two-tone chenille yarn in Comparative Example 2 includes the following steps:

[0091] S1. Prepare the core yarn and the fleece yarn. The core yarn is made of hydrophobic modified polyester fiber, and the fleece yarn is made of cationic modified polyester filament. The polyester fiber is made of 16N polyester fiber, and the cationic modified polyester filament is made of 300D144F low elasticity yarn.

[0092] S2. Four core yarns are fed into the spinning machine at a linear speed of 12m / min under the traction of the rollers. Under the action of the rollers and spacers, the yarn is cut into short feathers by the blades. The short feathers are clamped between the core yarns, and as the spindle rotates, the core yarns and the short feathers are twisted in an S-twist with a twist of 400T / m to obtain a semi-finished yarn.

[0093] S3. The three semi-finished yarns obtained in step S2 are twisted into a single strand by a plying machine using a Z-twist process. The Z-twist process includes two twisting steps: a first twist and a second twist. The two twisting steps are performed alternately to obtain the finished yarn. The twist of the first twist is 110T / m, the linear speed is 8m / min, and the twisting time is 4min. The twist of the second twist is 240T / m, the linear speed is 16m / min, and the twisting time is 2min.

[0094] S4. Prepare the second dyeing solution, by weight, in the following proportions: 14 parts oil-soluble dye, 13 parts ethanol, 3 parts isopropanol, 5 parts sulfated castor oil, and 80 parts water; immerse the finished yarn obtained in step S4 in the second dyeing solution, with a bath ratio of 1:25 between the finished yarn and the second dyeing solution; let it stand at room temperature for 40 minutes, and then dry it at 100°C for 5 minutes to obtain a single-color finished yarn; wherein, the oil-soluble dye is Green G dye.

[0095] S5. Prepare the first dyeing solution, with the following specific proportions by weight: 9 parts cationic dye, 0.6 parts leveling agent O, 0.4 parts penetrant JFC, 1 part sodium methylene dimethylnaphthalene sulfonate, and 130 parts water; immerse the single-color finished yarn obtained in step S3 in the first dyeing solution, with a bath ratio of 1:30 between the single-color finished yarn and the first dyeing solution; add glacial acetic acid to adjust the pH value to approximately 5, dye at 85°C for 110 minutes, then wash in sodium carbonate solution (3g / L) and rinse in clean water to obtain the two-color finished yarn; wherein, the cationic dye selected is cationic turquoise blue X-GB.

[0096] S6. The two-color finished yarn obtained in step S5 is steamed at 110℃ for 2 hours with a color-fixing solution, cooled to room temperature, rinsed in clean water, and dried to obtain pure polyester two-color chenille yarn; the color-fixing solution is prepared with the following ratio: color-fixing agent 3g / L, glacial acetic acid 1.5g / L, and water as the solvent.

[0097] Performance testing

[0098] 1. The pure polyester two-tone chenille yarns obtained in Examples 1-7 and Comparative Examples 1-2 were used to prepare textiles for color fastness to rubbing according to the test method of the national standard GB / T3920-1997 "Textiles - Tests for color fastness to rubbing". The pure polyester two-tone chenille yarns obtained in Examples 1-7 and Comparative Examples 1-2 were used to prepare textiles for color fastness to washing according to the test method of standard AATCC 61-2009.

[0099] 2. The K / S values ​​of the core and yarn of the pure polyester two-color chenille yarn prepared in Examples 1-7 and Comparative Examples 1-2 were determined with reference to the national standard GB / T 8424-2001.

[0100] The performance test results are shown in Table 1.

[0101] surface

[0102]

[0103]

[0104] Analysis of the data in Table 1 and comparison of the data from Examples 1-7 with those from Comparative Examples 1-2 show that the modification of polyester fibers and the dyeing sequence both affect the color fastness, K / S value, and hand feel of the resulting pure polyester two-tone chenille yarn. The pure polyester two-tone chenille yarn obtained in Example 1 of this application has high color fastness and its color is also relatively bright, resulting in a better dyeing effect. Therefore, the preparation process of the pure polyester two-tone chenille yarn in this application is suitable for widespread use in industrial production.

[0105] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A process for the preparation of pure polyester bi-colour chenille yarn characterized by, It comprises the following steps: S1, prepare the core line and the wool line, the core line selects the hydrophobic modified polyester macro fiber, the wool line selects the cation modified polyester filament; S2, send 4 core lines into the spinning machine at a line speed of 10-16 m / min under the traction of the roller, under the action of the roller and the spacing sheet, the wool line is cut into short feathers when encountering the blade; the short feather is clamped between the core lines, and with the rotation of the spindle, the core line and the short feather are S twisted and twisted, the twist of the S twist is 350-500 T / m, and the semi-finished yarn is prepared; S3, 2-5 semi-finished yarns prepared in the step S2 are Z twisted and twisted by a plying machine and are plied into one, the Z twist includes first twist and second twist, and the two twist processes are carried out alternately, and the finished yarn is prepared; S4, configure the first dyeing liquid and immerse the finished yarn prepared in the step S3 in the first dyeing liquid, adjust the pH value of the first dyeing liquid to 4.5-5.5, dye, enter the dyeing at 70-90 DEG C for 80-120 min, wash in sodium carbonate solution, rinse in clean water, and prepare the single-color finished yarn; S5, configure the second dyeing liquid and immerse the single-color finished yarn prepared in the step S4 in the second dyeing liquid, stand for 30-50 min at room temperature, dry at 90-130 DEG C for 5-10 min, and prepare the double-color finished yarn; S6, steam the double-color finished yarn prepared in the step S5 with the fixing liquid for 2-3 h, cool to room temperature, rinse in clean water, dry, and prepare the pure polyester double-color chenille yarn; In the step S1, the preparation method of the hydrophobic modified polyester macro fiber comprises the following steps: (1) pretreatment: the polyester macro fiber is immersed in a 90wt% phosphoric acid solution for 20-30 min, dried at 130 DEG C for 5-10 min, then immersed in a 90wt% phosphoric acid solution for 10-20 min, and dried at 130 DEG C for 5-10 min; (2) tetrabutyl titanate is added to anhydrous ethanol, nano silicon dioxide, deionized water and pretreated polyester macro fiber are added, and the reaction is carried out while stirring, and the reaction is carried out at 110 DEG C for 1-2 h, the polyester macro fiber is taken out and dried, immersed in a hexadecyl dimethyl chlorosilane liquid, and dried to prepare the hydrophobic modified polyester macro fiber; the weight ratio of the polyester macro fiber, anhydrous ethanol, tetrabutyl titanate, nano silicon dioxide, deionized water and hexadecyl dimethyl chlorosilane is 6-12:15-25:1-2.5:1-2:50-70:10; In the step S4, the first dyeing liquid comprises the following raw materials by weight: cationic dye 5-10 parts, Pingpingka O 0.3-0.8 parts, penetrating agent JFC 0.3-0.9 parts, methylene bis naphthalene sulfonic acid sodium 0.6-1.2 parts and water 120-160 parts; In the step S5, the second dyeing liquid comprises the following raw materials by weight: oil-soluble dye 10-20 parts, ethanol 8-15 parts, isopropyl alcohol 2-5 parts, sulfated castor oil 2-8 parts and water 60-90 parts.

2. The process for preparing pure polyester bi-colour chenille yarn as claimed in claim 1 wherein, The polyester macro fiber is 16N polyester macro fiber.

3. The process for preparing pure polyester bi-colour chenille yarn as claimed in claim 1 wherein, The cationic modified polyester filament is 150D-600D96F-288F low stretch yarn, and the 150D-600D96F-288F low stretch yarn comprises one or more of 150D96F low stretch yarn, 150D144F low stretch yarn, 150D188F low stretch yarn, 150D288F low stretch yarn, 300D96F low stretch yarn, 300D144F low stretch yarn, 300D188F low stretch yarn, 300D288F low stretch yarn, 600D96F low stretch yarn, 600D144F low stretch yarn, 600D188F low stretch yarn, and 600D288F low stretch yarn.

4. The process for preparing pure polyester bi-colour chenille yarn as claimed in claim 1 wherein, In the step S3, the twist of the first twist is 85-120T / m, the linear speed is 4-10m / min, and the twisting time is 3-5min; the twist of the second twist is 200-250T / m, the linear speed is 14-18m / min, and the twisting time is 1-3min.

5. The process for preparing pure polyester bi-colour chenille yarn as claimed in claim 1 wherein, The cationic dyes are selected from one or more of cationic red X-GRL, cationic brilliant red X-5GN, cationic yellow X-3RL, cationic golden yellow X-GL, cationic blue X-GRL, cationic blue X-BL, and cationic turquoise blue X-GB.

6. The process for preparing pure polyester bi-colour chenille yarn as claimed in claim 1 wherein, The oil-soluble dyes are anthraquinone dyes or heterocyclic dyes, and are selected from one or more of yellow GG dye, red G dye, red EG dye, red BB dye, blue 2RA dye, purple BA dye, green G dye, and brown R dye. 7.A pure polyester double-color chenille yarn prepared by the preparation process of the pure polyester double-color chenille yarn according to any one of claims 1-6.

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