WO2023087650A1 - 一种高强高模量锦纶66工业用长丝生产方法 - Google Patents

一种高强高模量锦纶66工业用长丝生产方法 Download PDF

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Publication number
WO2023087650A1
WO2023087650A1 PCT/CN2022/094663 CN2022094663W WO2023087650A1 WO 2023087650 A1 WO2023087650 A1 WO 2023087650A1 CN 2022094663 W CN2022094663 W CN 2022094663W WO 2023087650 A1 WO2023087650 A1 WO 2023087650A1
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Prior art keywords
drafting
temperature
nylon
rollers
pairs
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PCT/CN2022/094663
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English (en)
French (fr)
Inventor
仵晓
李新
杨朝勇
刘晓光
吕忠信
李改真
吴齐
王锦涛
姚瑞芬
张明
张会云
马建坤
张华�
刘冬旭
孟为库
贺迎亚
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平顶山神马帘子布发展有限公司
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Publication of WO2023087650A1 publication Critical patent/WO2023087650A1/zh

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/098—Melt spinning methods with simultaneous stretching
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/084—Heating filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D01D5/096—Humidity control, or oiling, of filaments, threads or the like, leaving the spinnerettes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/08—Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams

Definitions

  • the invention relates to the technical field of production of chemical fiber industrial filaments, in particular to a production method of high-strength and high-modulus nylon 66 industrial filaments.
  • nylon 66 industrial filaments There are two methods for producing nylon 66 industrial filaments: one is continuous polymerization and direct spinning; the other is slice melt spinning. Regardless of whether it is continuous polymerization direct spinning or sliced melt spinning, the melt needs to pass through the spinning assembly to form nylon 66 industrial filaments, and the spinning viscosity (relative viscosity of formic acid) is between 69 and 80. After the nylon 66 primary fiber is discharged from the spinneret of the spinning assembly, it must be drawn by the drafting equipment.
  • Nylon 66 industrial filaments are discharged from the spinneret, pass through the feed roller, the first pair of drafting rollers, the second pair of drafting rollers, the third pair of drafting rollers and the fourth pair of drafting rollers, and then enter through the yarn guide The winder forms the bobbins.
  • Nylon 66 industrial filaments need to be stretched twice before forming a filament drum, the first stretching is carried out between the first drafting roller and the second drafting roller, and the The second drawing is carried out between the rollers, the first drawing ratio is 2.5-3.3, the total drawing ratio is between 4.5-6.0, and the winding speed is 2300m/min-3800m/min.
  • nylon 66 industrial filament produced by this process, taking 1400dtex industrial filament as an example: 2% constant elongation load is 9.7N ⁇ 10.3N (that is, the modulus is 3.898GPa ⁇ 4.14GPa); 4% The constant elongation load is 15.4N ⁇ 16.5N; the 8% constant elongation load is 35.3N ⁇ 37.5N; the 12% constant elongation load is 71.3N ⁇ 76.8N; the strength is about 9.6g/d; the elongation at break is 16% ⁇ between 22%; constant load elongation between 10.5% and 13.5%; dry heat shrinkage between 4.5% and 7.7%.
  • the modulus of nylon 66 industrial filament directly affects the modulus of nylon 66 dipped cord.
  • the invention provides a production method of the high-strength and high-modulus nylon 66 industrial filament, by adjusting the drawing temperature, setting temperature and The setting ratio is used to improve the crystallinity and orientation of nylon 66 polymer, so as to achieve the purpose of improving the strength and modulus of nylon 66 industrial filament.
  • the present invention adopts following technical scheme:
  • a method for producing high-strength and high-modulus nylon 66 industrial filaments comprising the following steps: (1) forming nylon 66 primary fibers after the molten nylon 66 polymer is discharged through a spinneret;
  • the hot rollers include at least three pairs of drafting rollers arranged in sequence and at least one pair of sizing rollers arranged after the drafting roller process, and the temperature of the last pair of drafting rollers is 205°C-245°C.
  • nylon 66 industrial filament comes out of the multi-stage drafting equipment, it passes through the network device to perform network processing on the nylon 66 industrial filament, and then enters the winding machine for winding to form a filament tube.
  • the hole diameter of the spinneret is 0.23mm-0.45mm, and the aspect ratio is 1:1-3:1.
  • the multi-stage drafting equipment includes 4 pairs of hot rollers, the first three pairs of hot rollers are drafting rollers, the last pair of hot rollers are shaping rollers, the temperature of the first drafting roller is 50°C-65°C, the second The temperature of the drawing roll is 190°C-210°C, the temperature of the third drawing roll is 205°C-245°C, the temperature of the fourth shaping roll is 130°C-190°C; the setting ratio is 0.972-0.982.
  • the multi-stage drawing equipment includes 5 pairs of hot rollers, the first three pairs of hot rollers are drafting rollers, the last two pairs of hot rollers are shaping rollers, the temperature of the first drafting roller is 50°C-65°C, the second The temperature of the drafting roll is 190°C to 210°C, the temperature of the third drafting roll is 205°C to 245°C, the temperature of the fourth shaping roll is 160°C to 200°C, and the temperature of the fifth shaping roll is 120°C to 160°C; is 1.002.
  • the multi-stage drawing equipment includes 6 pairs of hot rollers, the first four pairs of hot rollers are drafting rollers, the last two pairs of hot rollers are shaping rollers, the temperature of the first drafting roller is 40°C-50°C, the second The temperature of the drafting roll is 50°C to 65°C, the temperature of the third drafting roll is 200°C to 220°C, the temperature of the fourth drafting roll is 220°C to 245°C, the temperature of the fifth shaping roll is 180°C to 200°C.
  • the temperature of the six shaping rollers is 130°C to 160°C; the shaping ratio is 0.953.
  • the present invention has the following technical effects:
  • the nylon 66 industrial filament produced by the present invention not only has higher strength, but also has the characteristics of higher modulus.
  • the invention realizes the purpose of producing high-strength and high-modulus nylon 66 industrial yarn by properly increasing the drawing temperature, reducing the setting temperature and increasing the setting ratio.
  • the nylon 66 industrial filament produced by the present invention has high strength, the strength level can reach 9.9-10.5g/d, and the improvement of the strength can reduce the usage amount of the dipped cord fabric in the tire and reduce the weight of the tire.
  • the modulus of the nylon 66 industrial filament produced by the present invention is high, the 2% constant elongation load of 1400dtex industrial yarn can reach 12.5N ⁇ 15.3N, the 4% constant elongation load can reach 19.7N ⁇ 26.1N, and the 8% constant elongation load can reach 19.7N ⁇ 26.1N.
  • the elongation load can reach 48.3N ⁇ 70.7N, and the 12% constant elongation load can reach 90.2N ⁇ 125.9N. That is, the modulus of the nylon 66 industrial filament produced by the present invention is higher, and it is difficult to deform, which not only can improve the fatigue resistance of the tire, but also prolongs the service life of the tire.
  • the constant elongation load of 2%, 4%, 8%, and 12% is used to measure the modulus level of nylon 66 industrial yarn in the present invention.
  • a kind of high strength high modulus nylon 66 industrial filament production method comprises the following steps:
  • the hot rollers include at least three pairs of drafting rollers arranged in sequence and at least one pair of sizing rollers arranged after the drafting roller process, and the temperature of the last pair of drafting rollers is 205°C-245°C.
  • the setting roller is to gradually relax the stretched nylon 66 industrial filaments.
  • the nylon 66 primary fiber obtained in step (4) is wound on the feed roller, and then enters the multi-stage draft equipment, and the feed roller has no heating device.
  • the first three pairs of hot rollers are drafting rollers, and the last pair of hot rollers are setting rollers.
  • the temperature of the first drafting roller is 50°C ⁇ 65°C
  • the temperature of the second drafting roller is 190°C ⁇ 210°C.
  • the temperature of the third drawing roll is 205°C-245°C
  • the temperature of the fourth shaping roll is 130°C-190°C; the setting ratio is 0.972-0.982.
  • the nylon 66 primary fiber obtained in step (4) is wound on the feed roller, and then enters the multi-stage draft equipment, and the feed roller has no heating device.
  • the first three pairs of hot rollers are drafting rollers, and the last two pairs of hot rollers are setting rollers.
  • the temperature of the first drafting roller is 50°C ⁇ 65°C
  • the temperature of the second drafting roller is 190°C ⁇ 210°C.
  • the temperature of the third drafting roll is 205°C-245°C
  • the temperature of the fourth shaping roll is 160°C-200°C
  • the temperature of the fifth shaping roll is 120°C-160°C;
  • the setting ratio is 1.002.
  • the multi-stage drafting equipment includes 6 pairs of hot rollers, the first four pairs of hot rollers are drafting rollers, and the last two pairs of hot rollers are setting rollers.
  • the temperature is 50°C-65°C
  • the temperature of the third drafting roll is 200°C-220°C
  • the temperature of the fourth drafting roll is 220°C-245°C
  • the temperature of the fifth shaping roll is 180°C-200°C
  • the sixth shaping roll The temperature is 130°C ⁇ 160°C; the setting ratio is 0.953.
  • the present invention appropriately increases the drawing temperature (that is, increases the temperature of the drafting rollers, especially the temperature of the last pair of drafting rollers), and reduces the setting temperature (that is, reduces the temperature of the setting rollers, especially the temperature of the last pair of setting rollers). And improve the setting ratio and the total draft ratio, so as to realize the purpose of producing high-strength and high-modulus nylon 66 industrial yarn.
  • the nylon 66 industrial filament comes out of the multi-stage drafting equipment, the nylon 66 industrial filament is processed by the network device, and then enters the winding machine for winding to form a filament tube, and the winding speed is 2300 ⁇ 2885m/min.
  • Shaping ratio refers to the ratio between the roll speed of the last pair of shaping rolls and the roll speed of the last pair of drafting rolls; the total draft ratio refers to the roll speed of the last pair of drafting rolls and the roll speed of the first pair of drafting rolls ratio between.
  • the present invention realizes the high consistency of polymer microscopic molecular arrangement by adjusting the setting ratio and the total drawing ratio, so as to achieve the purpose of improving the degree of orientation and crystallinity of the polymer.
  • the increase of the drawing temperature is to give the polymer sufficient energy
  • the reduction of the setting temperature is to rapidly cool the stretched tow to fix the existing polymer orientation and crystallinity, and prevent it from reducing the orientation and crystallization of the fiber after rapid shrinkage Spend.
  • the polyamide fiber 66 industrial filament of production is 1400dtex industrial yarn
  • the multi-stage drafting equipment that production process adopts comprises 4 pairs of hot rollers, and among 4 pairs of hot rollers, the first three pairs of hot rollers are drafting rollers, and the rear A pair of hot rolls are shaping rolls
  • the temperature of the first drafting roll (abbreviated as 1G) is 50°C-65°C
  • the temperature of the second drafting roll (abbreviated as 2G) is 190°C-210°C
  • the temperature of the third drafting roll (abbreviated as 3G) ) temperature is 205°C-245°C
  • the temperature of the fourth shaping roller (abbreviated as 4G) is 130°C-190°C.
  • Table 1 The parameter settings of each embodiment are shown in Table 1.
  • nylon 66 industrial filaments produced are 940dtex industrial filaments, and the multi-stage drafting equipment used in the production process includes 4 pairs of hot rollers.
  • the parameter settings of each embodiment are shown in Table 1.
  • the nylon 66 industrial filament produced is 1400dtex industrial filament
  • the multistage drafting equipment adopted in the production process includes 4 pairs of hot rollers.
  • the parameter settings of each embodiment are shown in Table 1.
  • the nylon 66 industrial filaments produced are 1400dtex industrial filaments
  • the multi-stage drafting equipment used in the production process includes 5 pairs of hot rollers.
  • the multi-stage drafting equipment includes 5 pairs of hot rollers, the first three pairs of hot rollers are drafting rollers, the last two pairs of hot rollers are setting rollers, the temperature of the first drafting roller (1G for short) is 50°C-65°C, the second The temperature of the second drawing roll (2G for short) is 190°C-210°C, the temperature of the third drawing roll (3G for short) is 205°C-245°C, the temperature of the fourth shaping roll (4G for short) is 160°C-200°C, The temperature of the five shaping rollers (abbreviated as 5G) is 120°C to 160°C.
  • the parameter settings of each embodiment are shown in Table 2.
  • Example 7 is a better example.
  • the nylon 66 industrial filaments produced are 467dtex industrial filaments
  • the multi-stage drafting equipment used in the production process includes 6 pairs of hot rollers.
  • the multi-stage drafting equipment includes 6 pairs of hot rollers, the first four pairs of hot rollers are drafting rollers, the last two pairs of hot rollers are setting rollers, the temperature of the first drafting roller (1G for short) is 40°C-50°C, the The temperature of the second drafting roll (abbreviated as 2G) is 50°C to 65°C, the temperature of the third drafting roll (abbreviated as 3G) is 200°C to 220°C, and the temperature of the fourth drafting roll (abbreviated as 4G) is 220°C to 245°C.
  • the temperature of the fifth shaping roll (5G for short) is 180°C-200°C, and the temperature of the sixth shaping roll (6G for short) is 130°C-160°C.
  • Table 3 The parameter settings of each embodiment are shown in Table 3.
  • Examples 11-13 all use 6 pairs of hot rollers. On the one hand, it is evidence for the process adjustment of Examples 1-10. On the other hand, it can also be seen that the more drafting rollers in the equipment, the more favorable Develop high-strength and high-modulus products.
  • Embodiment 11 is a preferred embodiment.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

一种高强度高模量锦纶66工业用长丝生产方法，通过调节牵伸比、牵伸温度、定型温度及定型比来提高锦纶66聚合物的结晶度、取向度，从而达到提高锦纶66工业用长丝强度和模量的目的。该锦纶66工业用长丝强度较高，强度水平可达9.9～10.5g/d；模量较高，1400dtex工业丝2％定伸长负荷可达12.5N～15.3N，4％定伸长负荷可达19.7N～26.1N，8％定伸长负荷可达48.3N～70.7N，12％定伸长负荷可达90.2N～125.9N，该锦纶66工业用长丝的模量较高，不易发生形变，能提高轮胎的尺寸稳定性，从而延长轮胎的寿命。

Description

一种高强高模量锦纶66工业用长丝生产方法 技术领域
本发明涉及化纤工业长丝生产技术领域，具体涉及一种高强度高模量锦纶66工业用长丝生产方法。
背景技术
现有锦纶66工业用长丝的生产方法有两种：一种是连续聚合直接纺丝；另一种是切片熔融纺丝。无论是连续聚合直接纺丝还是切片熔融纺丝熔体均需经过纺丝组件形成锦纶66工业用长丝，纺丝粘度(甲酸相对粘度)在69～80之间。锦纶66初生纤维经过纺丝组件的喷丝板吐出后要经过牵伸设备进行牵伸处理。
锦纶66工业用长丝从喷丝板吐出后经过喂入辊、第1对牵伸辊、第2对牵伸辊、第3对牵伸辊以及第4对牵伸辊后经导丝器进入卷绕机形成丝筒。锦纶66工业用长丝在形成丝筒前需经过两次拉伸，在第一牵伸辊和第二牵伸辊之间进行第一次拉伸，在第二牵伸辊和第三牵伸辊之间进行第二次拉伸，第一牵伸比为2.5～3.3，总牵伸比在4.5～6.0之间，卷绕速度在2300m/min～3800m/min。
用该工艺生产的锦纶66工业用长丝物性情况，以1400dtex工业用长丝为例：2％的定伸长负荷为9.7N～10.3N(即模量在3.898GPa～4.14GPa)；4％定伸长负荷为15.4N～16.5N；8％定伸长负荷35.3N～37.5N；12％定伸长负荷71.3N～76.8N；强度为9.6g/d左右；断裂伸长在16％～22％之间；定负荷伸长在10.5％～13.5％之间；干热收缩在4.5％～7.7％之间。锦纶66工业长丝的模量高低，直接影响锦纶66浸胶帘子线模量高低，浸胶帘子线制成轮胎后，影响轮胎在使用过程中的形变。因此，为了进一步提高轮胎的质量，研发高强度高模量锦纶66是本领域的不断追求。
发明内容
为了解决现有工艺生产的锦纶66工业用长丝模量不高的技术问题，本发明提供了一种高强度高模量锦纶66工业用长丝生产方法，通过调节牵伸温度、定型温度及定型比来提高锦纶66聚合物的结晶度、取向度，从而达到提高锦纶66工业用长丝强度和模量的目的。
本发明采用以下技术方案：
一种高强度高模量锦纶66工业用长丝生产方法，包括以下步骤：(1)将熔融的锦纶66聚合物经过喷丝板吐出后形成锦纶66初生纤维；
(2)用冷却风对步骤(1)中形成的锦纶66初生纤维进行冷却处理；
(3)将步骤(2)冷却后的锦纶66初生纤维经过纺丝甬道后上油处理；
(4)将步骤(3)中上油处理后的锦纶66初生纤维进行集束处理，并对锦纶66初生纤维进行预网络处理；
(5)步骤(4)所得锦纶66初生纤维进入多级牵伸设备上，所述多级牵伸设备包括至少4对热辊，所述锦纶66初生纤维依次缠绕在热辊上；
所述热辊包括依次设置的至少三对牵伸辊和设在牵伸辊工序后的至少一对定型辊，所述最后一对牵伸辊的温度为205℃～245℃。
(6)锦纶66工业用长丝从多级牵伸设备中出来后经过网络器对锦纶66工业用长丝进行网络处理，然后进入卷绕机上进行卷绕形成丝筒。
进一步地，所述喷丝板孔径为0.23mm～0.45mm，长径比为1:1～3:1。
进一步地，所述多级牵伸设备包括4对热辊，前三对热辊为牵伸辊，后一对热辊为定型辊，第一牵伸辊温度为50℃～65℃，第二牵伸辊温度为190℃～210℃，第三牵伸辊温度为205℃～245℃，第四定型辊温度为130℃～190℃；定型比为0.972～0.982。
进一步地，所述多级牵伸设备包括5对热辊，前三对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊温度为50℃～65℃，第二牵伸辊温度为190℃～210℃，第三牵伸辊温度为205℃～245℃，第四定型辊温度为160℃～200℃，第五定型辊温度为120℃～160℃；定型比为1.002。
进一步地，所述多级牵伸设备包括6对热辊，前四对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊温度为40℃～50℃，第二牵伸辊温度为50℃～65℃，第三牵伸辊温度为200℃～220℃，第四牵伸辊温度为220℃～245℃，第五定型辊温度为180℃～200℃，第六定型辊温度为130℃～160℃；定型比为0.953。
与现有技术相比，本发明具有以下技术效果：
1.通过本发明生产的锦纶66工业用长丝不仅具有较高的强度，而且具有较高模量的特点。本发明通过适当提高牵伸温度、降低定型温度及提高定型比，从而实现生产高强高模量锦纶66工业丝的目的。
2.本发明生产的锦纶66工业用长丝的强度较高，强度水平可达9.9～10.5g/d，强度的提高可以减少浸胶帘子布在轮胎中的使用量，减轻轮胎重量。
3.本发明生产的锦纶66工业用长丝模量高，1400dtex工业丝2％定伸长负荷可达12.5N～15.3N，4％定伸长负荷可达19.7N～26.1N，8％定伸长负荷可达48.3N～70.7N，12％定伸长负荷可达90.2N～125.9N。即本发明所生产的锦纶66工业用长丝的模量较高，不 易发生形变，不仅可以提高轮胎的耐疲劳性，也延长轮胎的使用寿命。
具体实施方式
下面结合具体实施方式对本发明进一步说明。
为了更简单、方便的表达锦纶66工业丝的模量，本发明中用2％、4％、8％、12％的定伸长负荷来衡量锦纶66工业丝的模量水平。
一种高强度高模量锦纶66工业用长丝生产方法，包括以下步骤：
(1)将熔融的锦纶66聚合物经过喷丝板吐出后形成锦纶66初生纤维；所述喷丝板孔径为0.23mm～0.45mm，长径比为1:1～3:1；
(2)用冷却风对步骤(1)中形成的锦纶66初生纤维进行冷却处理；
(3)将步骤(2)冷却后的锦纶66初生纤维经过纺丝甬道后上油处理；
(4)将步骤(3)中上油处理后的锦纶66初生纤维进行集束处理，并对锦纶66初生纤维进行预网络处理；
(5)步骤(4)所得锦纶66初生纤维进入多级牵伸设备上，所述多级牵伸设备包括至少4对热辊，所述锦纶66初生纤维依次缠绕在热辊上，直至无可用的热辊为止；
所述热辊包括依次设置的至少三对牵伸辊和设在牵伸辊工序后的至少一对定型辊，所述最后一对牵伸辊的温度为205℃～245℃。所述定型辊为对牵伸后的锦纶66工业用长丝进行逐步松弛。
当多级牵伸设备包括4对热辊时，步骤(4)所得锦纶66初生纤维缠绕在喂入辊，然后再进入多级牵伸设备，喂入辊无加热装置。4对热辊中前三对热辊为牵伸辊，后一对热辊为定型辊，第一牵伸辊温度为50℃～65℃，第二牵伸辊温度为190℃～210℃，第三牵伸辊温度为205℃～245℃，第四定型辊温度为130℃～190℃；定型比为0.972～0.982。
当多级牵伸设备包括5对热辊时，步骤(4)所得锦纶66初生纤维缠绕在喂入辊，然后再进入多级牵伸设备，喂入辊无加热装置。5对热辊中前三对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊温度为50℃～65℃，第二牵伸辊温度为190℃～210℃，第三牵伸辊温度为205℃～245℃，第四定型辊温度为160℃～200℃，第五定型辊温度为120℃～160℃；定型比为1.002。
当多级牵伸设备包括6对热辊时，前四对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊温度为40℃～50℃，第二牵伸辊温度为50℃～65℃，第三牵伸辊温度为200℃～220℃，第四牵伸辊温度为220℃～245℃，第五定型辊温度为180℃～200℃，第六定型辊温度为130℃～160℃；定型比为0.953。
本发明通过适当提高牵伸温度(即提高牵伸辊的温度，尤其是最后一对牵伸辊的温度)、降低定型温度(即降低定型辊的温度，尤其是最后一对定型辊的温度)及提高定型比、总牵伸比，从而实现生产高强高模量锦纶66工业丝的目的。
(6)锦纶66工业用长丝从多级牵伸设备中出来后经过网络器对锦纶66工业用长丝进行网络处理，然后进入卷绕机上进行卷绕形成丝筒，卷绕速度为2300～2885m/min。
定型比是指最后一对定型辊辊速与最后一对牵伸辊的辊速之间的比值；总牵伸比是指最后一对牵伸辊辊速与第一对牵伸辊的辊速之间的比值。
本发明通过定型比、总牵伸比的调整来实现聚合物微观分子排列的高度一致性，从而实现提高聚合物取向度以及结晶度的目的，牵伸温度的提高是为了给予聚合物充足的能量使其能够发生分子链的相对滑动，定型温度的降低是为了使已被拉伸的丝束迅速冷却固定现有的聚合物取向度和结晶度，防止其快速收缩后降低纤维的取向度和结晶度。
采用上述方法的应用实施例如下：
实施例
实施例1～4，生产的锦纶66工业用长丝为1400dtex工业丝，生产过程采用的多级牵伸设备包括4对热辊，4对热辊中前三对热辊为牵伸辊，后一对热辊为定型辊，第一牵伸辊(简称1G)温度为50℃～65℃，第二牵伸辊(简称2G)温度为190℃～210℃，第三牵伸辊(简称3G)温度为205℃～245℃，第四定型辊(简称4G)温度为130℃～190℃。每个实施例的参数设置如表1所示。
实施例5～6，生产的锦纶66工业用长丝为940dtex工业丝，生产过程采用的多级牵伸设备包括4对热辊。每个实施例的参数设置如表1所示。
对比实施例，生产的锦纶66工业用长丝为1400dtex工业丝，生产过程采用的多级牵伸设备包括4对热辊。每个实施例的参数设置如表1所示。
表1
Figure PCTCN2022094663-appb-000001
由表1可以看出，实施例1-6的强力和模量均比对比实施例高；1G、2G温度变化对模量影响不大或基本无影响；3G、4G温度变化对模量影响较大；实施例4为较优实施例。
实施例7～10，生产的锦纶66工业用长丝为1400dtex工业丝，生产过程采用的多级牵伸设备包括5对热辊。所述多级牵伸设备包括5对热辊，前三对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊(简称1G)温度为50℃～65℃，第二牵伸辊(简称2G)温度为190℃～210℃，第三牵伸辊(简称3G)温度为205℃～245℃，第四定型辊(简称4G)温度为160℃～200℃，第五定型辊(简称5G)温度为120℃～160℃。每个实施例的参数设置如表2所示。
表2
Figure PCTCN2022094663-appb-000002
由表2可以看出，5G定型温度、3G牵伸温度对模量影响较大，实施例7为较优实施例。
实施例11～13，生产的锦纶66工业用长丝为467dtex工业丝，生产过程采用的多级牵伸设备包括6对热辊。所述多级牵伸设备包括6对热辊，前四对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊(简称1G)温度为40℃～50℃，第二牵伸辊(简称2G)温度为50℃～65℃，第三牵伸辊(简称3G)温度为200℃～220℃，第四牵伸辊(简称4G)温度为220℃～245℃，第五定型辊(简称5G)温度为180℃～200℃，第六定型辊(简称6G)温度为130℃～160℃。每个实施例的参数设置如表3所示。
表3
项目 单位 实施例11 实施例12 实施例13
1G温度 ℃ 40 40 40
2G温度 ℃ 65 50 65
3G温度 ℃ 220 175 220
4G温度 ℃ 245 220 245
5G温度 ℃ 210 195 210
6G温度 ℃ 130 160 140
纺速(卷绕速度) m/min 2500 2500 2500
总牵伸比 / 5.224 5.224 5.224
定型比 / 0.953 0.953 0.953
丝束在2G停留时间 ms 483 483 483
丝束在3G停留时间 ms 138 138 138
丝束在4G停留时间 ms 95 95 95
丝束在5G停留时间 ms 99 99 99
丝束在6G停留时间 ms 92 92 92
线密度 dtex 467 467 467
断裂伸长 ％ 16.5 16.2 16.5
2％定伸长负荷 N 5.1 4.8 5.0
4％定伸长负荷 N 8.7 8.0 8.4
8％定伸长负荷 N 23.6 21.5 22.4
12％定伸长负荷 N 42.0 39.1 40.5
强度 g/d 10.1 10.0 10.1
由表3可以看出，实施例11-13均采用6对热辊，一方面是对1-10实施例工艺调整的佐证，另一方面也可以看出设备牵伸辊越多，越有利于开发高强高模量产品。实施例11为较优实施例。
定伸长负荷换算方法举例：940dtex的2％定伸长负荷为9.3N时，换算为1400dtex定伸长负荷数据为9.3*1400/940＝13.85N，467dtex2％定伸长负荷为5.1N时，换算为1400dtex定伸长负荷为5.1*1400/467＝15.3N。
以上所述之实施例，只是本发明的较佳实施例而已，仅仅用以解释本发明，并非限制本发明实施范围，对于本技术领域的技术人员来说，当然可根据本说明书中所公开的技术内容，通过置换或改变的方式轻易做出其它的实施方式，故凡在本发明的原理及工艺条件所做的变化和改进等，均应包括于本发明申请专利范围内。

Claims (5)

  1. 一种高强度高模量锦纶66工业用长丝生产方法，其特征在于，包括以下步骤：
    (1)将熔融的锦纶66聚合物经过喷丝板吐出后形成锦纶66初生纤维；
    (2)用冷却风对步骤(1)中形成的锦纶66初生纤维进行冷却处理；
    (3)将步骤(2)冷却后的锦纶66初生纤维经过纺丝甬道后上油处理；
    (4)将步骤(3)中上油处理后的锦纶66初生纤维进行集束处理，并对锦纶66初生纤维进行预网络处理；
    (5)步骤(4)所得锦纶66初生纤维进入多级牵伸设备上，所述多级牵伸设备包括至少4对热辊，所述锦纶66初生纤维依次缠绕在热辊上；
    所述热辊包括依次设置的至少三对牵伸辊和设在牵伸辊工序后的至少一对定型辊，所述最后一对牵伸辊的温度为205℃～245℃；
    (6)锦纶66工业用长丝从多级牵伸设备中出来后经过网络器对锦纶66工业用长丝进行网络处理，然后进入卷绕机上进行卷绕形成丝筒。
  2. 根据权利要求1所述的一种高强度高模量锦纶66工业用长丝生产方法，其特征在于，所述喷丝板孔径为0.23mm～0.45mm，长径比为1:1～3:1。
  3. 根据权利要求1所述的一种高强度高模量锦纶66工业用长丝生产方法，其特征在于，所述多级牵伸设备包括4对热辊，前三对热辊为牵伸辊，后一对热辊为定型辊，第一牵伸辊温度为50℃～65℃，第二牵伸辊温度为190℃～210℃，第三牵伸辊温度为205℃～245℃，第四定型辊温度为130℃～190℃；定型比为0.972～0.982。
  4. 根据权利要求1所述的一种高强度高模量锦纶66工业用长丝生产方法，其特征在于，所述多级牵伸设备包括5对热辊，前三对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊温度为50℃～65℃，第二牵伸辊温度为190℃～210℃，第三牵伸辊温度为205℃～245℃，第四定型辊温度为160℃～200℃，第五定型辊温度为120℃～160℃；定型比为1.002。
  5. 根据权利要求1所述的一种高强度高模量锦纶66工业用长丝生产方法，其特征在于，所述多级牵伸设备包括6对热辊，前四对热辊为牵伸辊，后两对热辊为定型辊，第一牵伸辊温度为40℃～50℃，第二牵伸辊温度为50℃～65℃，第三牵伸辊温度为200℃～220℃，第四牵伸辊温度为220℃～245℃，第五定型辊温度为180℃～200℃，第六定型辊温度为130℃～160℃；定型比为0.953。
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