Nylon 6 DTY (Draw Textured Yarn) with high crimp shrinkage and preparation method thereof

Abstract

The invention discloses chinlon 6DTY with high crimp shrinkage and a preparation method of the chinlon 6DTY, and belongs to the technical field of textile fiber processes. The method comprises the following steps: by taking chinlon 6 POY as a raw material, putting the chinlon 6 POY on a raw yarn frame, and sequentially passing through a first roller, a spinning-in rod yarn guide, a hot box, a cooling plate, a false twister, a second roller, an oiling device and a coiling roller, so as to prepare chinlon 6 DTY with high crimp shrinkage; the crimp shrinkage rate of traditional chinlon 6 DTY is generally lower than 58%, the application requirements of the current textile fiber market for high-shrinkage, high-wear-resistance and high-resilience cloth are difficult to meet, the chinlon 6 DTY has the excellent crimp shrinkage rate and crimp stability, shows good elasticity and bulkiness, does not have the defects of broken filaments, stiff filaments, tight points and the like, and has the advantages of being good in elasticity, good in wear resistance and good in elasticity. Wide market prospects and application values are realized.

Description

[0001] The invention belongs to the technical field of textile fiber technology, and particularly relates to nylon 6DTY with high curling shrinkage rate and a preparation method thereof. Background Art

[0002] With the rapid development of my country's economy, people's consumption capacity and consumption level are constantly upgrading, and there are higher requirements for the quality and comfort of textiles. Nylon is currently widely used in textiles and clothing due to its unparalleled advantages over other fibers in terms of performance. At the same time, as people's requirements for the beauty and comfort of clothing are further improved, the elasticity and softness of clothing have increased the demand for high-elastic yarn for weaving underwear. Therefore, high-quality nylon fibers used in clothing, especially linings, must have certain curling and shrinking properties.

[0003] A Chinese patent with publication number CN117166078A and application date September 4, 2023 discloses high shape-retention nylon DTY and a texturing process. By adding natural rubber, styrene-butadiene rubber, butadiene rubber, vulcanizer and accelerator to the raw materials for preparing POY yarn, the uncross-linked rubber has good fluidity in the false twisting step. After heat setting, the rubber molecules undergo a cross-linking reaction to form a network structure, so that the prepared nylon DTY has good curl stability, curl shrinkage, breaking strength and elongation at break. However, this method requires the additional addition of antioxidants, processing aids, softeners, antistatic agents, natural rubber, styrene-butadiene rubber, butadiene rubber, insoluble sulfur, scorch retarders, etc. as raw materials. The preparation of raw materials is relatively complicated, which is not conducive to large-scale industrial production.

[0004] A Chinese patent with publication number CN108914231A and application date of August 13, 2018 discloses a fully drawn nylon 6 yarn with curly appearance and a production method thereof. The cross-section of the spinning microholes of the spinneret is double-edged serrated and the angle design of the connection between the side blowing air and the spinning microholes is such that the prepared fully drawn nylon 6 yarn with curly appearance maintains the performance of the fully drawn nylon 6 yarn and has a certain degree of curvature in appearance. However, the fully drawn nylon 6 yarn does not essentially curl and shrink, but only forms a small filament bundle similar to a tassel, which can make the surface of the fancy yarn fluffy.

[0005] In summary, the study of nylon 6 DTY with high crimp shrinkage is not only an improvement on the performance of existing materials, but also a promotion of technological innovation in the field of textile and material science. Through in-depth research on the crimp shrinkage mechanism of nylon 6 DTY, it can promote the technological innovation and industrial upgrading of nylon 6 DTY textile technology, promote the upgrading and development of the entire industrial chain, and have important significance in improving material performance and function, promoting sustainable development and environmental protection, and expanding application fields and market prospects. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a nylon 6 DTY with a high curl shrinkage rate and a preparation method thereof. The nylon 6 DTY has excellent curl shrinkage rate and curl stability, exhibits good elasticity and fluffiness, has no defects such as fuzzy fibers, stiff fibers, tight spots, etc., and has broad market prospects and application value.

[0007] The technical solution of the present invention is as follows:

[0008] One of the purposes of the present invention is to provide a method for preparing nylon 6 DTY with a high crimp shrinkage rate, wherein SD 45D / 12F nylon 6 POY yarn is used as a raw material, is placed on a raw yarn rack, and sequentially passes through a first roller, a spinning rod guide, a hot box, a cooling plate, a false twister, a second roller, an oiling device, and a winding roller to prepare nylon 6 DTY with a high crimp shrinkage rate;

[0009] The temperature of the hot box is 150-200°C;

[0010] The draft ratio of the first roller to the second roller is 1.2-1.3;

[0011] The ratio of the untwisting tension to the twisting tension in the false twister is 0.8-1.0.

[0012] Furthermore, the fineness of the SD 45D / 12F nylon 6POY yarn is 45-87D, and the number of yarns is 10-36F.

[0013] Furthermore, the speed of the second roller is 600-800 m / min.

[0014] Furthermore, the over-position rate of the first roller and the second roller is -2.0-4.0%.

[0015] Furthermore, the false twister is a friction spindle group type false twister, which adopts any one of the spindle group combinations of 1-5-1, 1-6-1, and 1-7-1.

[0016] Furthermore, the friction disc is made of a ceramic disc, the lead-in disc is an optical disc, the working disc is a ceramic disc, and the lead-out disc is a knife-edge disc.

[0017] Furthermore, the false twist speed ratio is equal to the ratio of the linear speed of the false twister's circular motion to the speed of the second roller, and the ratio is 1.5-2.0.

[0018] A second object of the present invention is to provide a nylon 6 DTY with high crimp shrinkage.

[0019] Furthermore, the curl shrinkage of the nylon 6 DTY is 58%-70%, and the curl stability is 65%-90%.

[0020] Furthermore, the nylon 6 DTY has an elongation of 25-30% and a breaking strength of 4.0-5.0 cN / dtex.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. In current textile production, fibers with high curl are widely used in the production of elastic fabrics and thermal underwear, but currently they are mainly concentrated in polyester types, and there is still a large research gap in nylon 6 DTY with high curl shrinkage. The present invention innovates the preparation method of nylon 6 DTY by adjusting the production process, and designs a special raw material and process parameter combination. Under this parameter combination, nylon 6 DTY with excellent high curl shrinkage and curl stability can be stably and efficiently prepared, so that it has better high shrinkage, resilience and feel, and meets the development trend of functionalization of nylon 6 DTY and differentiated market demand.

[0023] Among them, nylon 6POY with a fineness of 45-87D and a root number of 10-36F is selected as the raw material, which not only ensures softness and plasticity, but also avoids processing difficulties caused by excessive elongation; based on this raw material, the temperature of the hot box is adjusted to be 5-20℃ higher than the conventional temperature, and the draft ratio is adjusted to add 30 points on the basis of the minimum stretching, which can not only prevent stiff yarns, but also improve the shrinkage rate and fluffiness of the yarns; at the same time, the ratio of the untwisting tension and the twisting tension in the false twister is accurately controlled to make the yarn twist more and untwist less (premise is no tight twist), and the yarn fluffiness is better, thereby further improving the shrinkage rate.

[0024] 2. The present invention discloses for the first time a method for preparing nylon 6 DTY with a high curl shrinkage rate without the need for additional additives. The preparation method is simple in process, avoids process changes caused by switching production, and improves the stability of nylon 6 DTY production. The prepared nylon 6 DTY has high curl shrinkage performance, a curl shrinkage rate of 58%-70%, and a curl stability of 65%-90%. This high curl shrinkage performance enables the fabric of nylon 6 DTY to produce a unique texture and feel during heat treatment or wearing, improves the simulation and comfort of the fabric, and when blended with other fibers and in the textile printing and dyeing process, it can promote heat shrinkage, and the ordinary fibers blended with it produce curling, fluffy and other effects. Through structural changes, the overall feel of the fabric is softer and fuller, and the wearing comfort and warmth of the fabric are improved.

[0025] 3. The high curl shrinkage rate of the nylon 6 DTY of the present invention enables the fiber to quickly recover to its original shape after being subjected to external force, further enhancing the cohesion between the fibers, making them more compact, wear-resistant and maintaining good morphological stability. At the same time, the fiber can produce a large shrinkage when heated or subjected to other external stimuli, thereby giving better elasticity and resilience, and can play an excellent role in clothing or home textile products that require high elasticity and resilience. The nylon 6 DTY with a high curl shrinkage rate of the present invention can show great potential and market prospects in the textile industry by virtue of its excellent physical properties, unique shrinkage performance and wide application fields. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with preferred embodiments. The endpoints of the ranges disclosed in the present invention and any values ​​are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be deemed to be specifically disclosed herein.

[0027] The experimental methods in the following examples, unless otherwise specified, are conventional methods and are performed according to the techniques or conditions described in the literature in the art or according to the product instructions.

[0028] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0029] Example 1

[0030] This embodiment provides a method for preparing nylon 6 DTY with high crimp shrinkage, comprising the following steps:

[0031] Firstly, SD 45D / 12F nylon 6 POY yarn is put into the raw yarn rack as raw material, and then passes through the first roller, the spinning rod guide, the hot box, the cooling plate, the false twister, the second roller, the oiling device, and the winding roller in sequence to prepare the nylon 6 POY with uniform and regular winding of the yarn, and finally the DTY production process is carried out to obtain nylon 6 DTY with high crimp shrinkage.

[0032] Among them, the temperature of the hot box is 200°C, the speed of the second roller is 600m / min, the draft ratio of the first roller and the second roller is 1.2, and a friction spindle group false twister with a spindle group combination of 1-5-1 is adopted. The friction disk is made of ceramic disk, the inlet disk is an optical disk, the working disk is a ceramic disk, the outlet disk is a knife-edge disk, the linear speed of the circular motion is 900m / min, the ratio of untwisting tension to twisting tension is 0.8, and the winding over-position rate is -2.0%.

[0033] Example 2

[0034] This embodiment provides a method for preparing nylon 6 DTY with high crimp shrinkage, comprising the following steps:

[0035] Firstly, SD 45D / 12F nylon 6 POY yarn is put into the raw yarn rack as raw material, and then passes through the first roller, the spinning rod guide, the hot box, the cooling plate, the false twister, the second roller, the oiling device, and the winding roller in sequence to prepare the nylon 6 POY with uniform and regular winding of the yarn, and finally the DTY production process is carried out to obtain nylon 6 DTY with high crimp shrinkage.

[0036] Among them, the temperature of the hot box is 170°C, the speed of the second roller is 700m / min, the draft ratio of the first roller and the second roller is 1.3, and a friction spindle group false twister with a spindle group combination of 1-6-1 is adopted. The friction disk is made of ceramic disk, the inlet disk is an optical disk, the working disk is a ceramic disk, the outlet disk is a knife-edge disk, the linear speed of the circular motion is 1100m / min, the ratio of untwisting tension to twisting tension is 1.0, and the winding over-position rate is 1.0%.

[0037] Example 3

[0038] This embodiment provides a method for preparing nylon 6 DTY with high crimp shrinkage, comprising the following steps:

[0039] Firstly, SD 45D / 12F nylon 6 POY yarn is put into the raw yarn rack as raw material, and then passes through the first roller, the spinning rod guide, the hot box, the cooling plate, the false twister, the second roller, the oiling device, and the winding roller in sequence to prepare the nylon 6 POY with uniform and regular winding of the yarn, and finally the DTY production process is carried out to obtain nylon 6 DTY with high crimp shrinkage.

[0040] Among them, the temperature of the hot box is 150°C, the speed of the second roller is 800m / min, the draft ratio of the first roller and the second roller is 1.2, and a friction spindle group false twister with a spindle group combination of 1-7-1 is adopted. The friction disk is made of a ceramic disk, the inlet disk is an optical disk, the working disk is a ceramic disk, the outlet disk is a knife-edge disk, the linear speed of the circular motion is 1200m / min, the ratio of untwisting tension to twisting tension is 0.9, and the winding over-position rate is 4.0%.

[0041] Performance Testing

[0042] Set YS as processing speed, DR as stretching multiple, H1 as first hot box temperature, K value

[0043] =T2 / T1, where T2 is the tension at the false twister outlet, T1 is the tension at the false twister inlet, and the K value is inversely proportional to D / Y.

[0044] 1. 40D / 12F Nylon 6 DTY

[0045] Using 40D / 12F nylon 6 POY yarn as raw material, nylon 6 DTY was prepared by the preparation method of the present invention and the conventional method respectively, and the specific parameters were as follows:

[0046] Specification YS DR H1 D / Y combination T1 T2 K Value 40D / 12F high curl 780 1.275 188 1.65 1-6-1 15.6 13.4 0.85 Regular 40D / 12F 760 1.312 182 1.67 1-6-1 16.5 15.8 0.95

[0047] As shown in Table 1, the nylon 6 DTY with high curl shrinkage prepared by the preparation method of the present invention is superior to the nylon 6 DTY prepared by the conventional method in terms of curl shrinkage and curl stability, and also has good elongation at break and boiling water shrinkage.

[0048] Table 1 40D / 12F Nylon 6 DTY Performance Comparison

[0049]

[0050] 2. 70D / 12F Nylon 6 DTY

[0051] Using 70D / 12F nylon 6 POY yarn as raw material, nylon 6 DTY was prepared by the preparation method of the present invention and the conventional method respectively, and the specific parameters were as follows:

[0052] Specification YS DR H1 D / Y combination T1 T2 K Value 70D / 12F high curl 700 1.242 195 1.60 1-7-1 23.5 19.1 0.81 Regular 70D / 12F 760 1.270 178 1.58 1-7-1 24.8 23.5 0.95

[0053] As shown in Table 2, the nylon 6 DTY with high curl shrinkage prepared by the preparation method of the present invention is superior to the nylon 6 DTY prepared by the conventional method in terms of curl shrinkage and curl stability, and also has good elongation at break and boiling water shrinkage.

[0054] Table 2 70D / 12F Nylon 6 DTY Performance Comparison

[0055]

[0056] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for preparing nylon 6DTY with high crimp shrinkage, characterized in that: Nylon 6 POY yarn is used as raw material, put into the raw yarn rack, and passes through the first roller, the spinning rod guide, the hot box, the cooling plate, the false twister, the second roller, the oiling device, and the winding roller in sequence to prepare nylon 6DTY with high crimp shrinkage rate; The temperature of the hot box is 150-200°C; The draft ratio of the first roller to the second roller is 1.2-1.3; The ratio of the untwisting tension to the twisting tension in the false twister is 0.8-1.

0.

2. The method for preparing nylon 6DTY with high crimp shrinkage according to claim 1, characterized in that: The fineness of the nylon 6 POY yarn is 45-87D, and the number of yarns is 10-36F.

3. The method for preparing nylon 6DTY with high crimp shrinkage according to claim 1, characterized in that: The speed of the second roller is 600-800 m / min.

4. The method for preparing nylon 6DTY with high crimp shrinkage according to claim 1, characterized in that: The over-position rates of the first roller and the second roller are -2.0-4.0%.

5. The method for preparing nylon 6DTY with high crimp shrinkage according to claim 1, characterized in that: The false twister is a friction spindle group type false twister, which adopts any one of the spindle group combinations of 1-5-1, 1-6-1 and 1-7-1.

6. A method for preparing nylon 6DTY with high crimp shrinkage according to claim 5, characterized in that: The friction disk in the friction spindle group type false twister is made of a ceramic disk, the introduction disk is an optical disk, the working disk is a ceramic disk, and the lead-out disk is a knife-edge disk.

7. The method for preparing nylon 6DTY with high crimp shrinkage according to claim 5, characterized in that: The false twist speed ratio is equal to the ratio of the linear speed of the false twister's circular motion to the speed of the second roller, and the ratio is 1.5-2.

0.

8. Nylon 6DTY with high crimp shrinkage prepared by the method according to any one of claims 1 to 7.

9. The nylon 6DTY with high crimp shrinkage according to claim 8, characterized in that: The curl shrinkage rate of the nylon 6DTY is 58-70%, and the curl stability is 65-90%.

10. The nylon 6DTY with high crimp shrinkage according to claim 8, characterized in that: The elongation of the nylon 6DTY is 25-30%, and the breaking strength is 4.0-5.0 cN / dtex.

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