CN112746337A - Nylon 66 high-air-tightness air bag yarn and preparation method thereof - Google Patents
Nylon 66 high-air-tightness air bag yarn and preparation method thereof Download PDFInfo
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- CN112746337A CN112746337A CN202011526679.XA CN202011526679A CN112746337A CN 112746337 A CN112746337 A CN 112746337A CN 202011526679 A CN202011526679 A CN 202011526679A CN 112746337 A CN112746337 A CN 112746337A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 229920002302 Nylon 6,6 Polymers 0.000 title claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 21
- 238000001125 extrusion Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000007493 shaping process Methods 0.000 claims abstract description 11
- 239000000155 melt Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 18
- 229920006052 Chinlon® Polymers 0.000 claims description 17
- 238000006116 polymerization reaction Methods 0.000 claims description 10
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 9
- 235000019253 formic acid Nutrition 0.000 claims description 9
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 238000009987 spinning Methods 0.000 abstract description 21
- 239000004744 fabric Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- 230000000379 polymerizing effect Effects 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 5
- 239000007790 solid phase Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- D01D1/00—Treatment of filament-forming or like material
- D01D1/10—Filtering or de-aerating the spinning solution or melt
- D01D1/106—Filtering
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Artificial Filaments (AREA)
Abstract
The invention provides a nylon 66 high-air-tightness air bag yarn and a preparation method thereof. The method comprises the steps of polymerizing and tackifying nylon 66 slices, carrying out melt extrusion, filtering a melt, carrying out spinning, cooling and forming, oiling, stretching and shaping and winding; compared with the common air bag filament, the air bag filament prepared by the method has the advantages that the dry heat shrinkage rate reaches 8.0-12.0%, the shrinkage rate is improved by about 100%, the air bag has higher density and air tightness due to large shrinkage rate, the obtained air bag cloth can meet the requirement of service performance without being coated, and the air bag filament has good application and development prospects.
Description
Technical Field
The invention belongs to the technical field of spinning. In particular to a nylon 66 high-air-tightness air bag yarn and a preparation method thereof.
Background
The chinlon 66 has the advantages of high strength, good rigidity, impact resistance, wear resistance, oil resistance, chemical corrosion resistance and the like, and particularly has better hardness, rigidity, heat resistance and creep property. Chinlon 66 has wide use in various fields due to its excellent properties.
The nylon 66 has excellent service performance in automobile parts, and the nylon 66 air bag yarn has good application in the field of automobile safety air bags. In recent years, with the rapid development of the automobile industry, the demand for airbag filaments has also expanded rapidly. The dry shrinkage of the conventional automobile safety airbag yarn is between 3.0 and 6.0 percent, the shrinkage is low, the air tightness is poor, the airbag cloth cannot be directly woven, the downstream needs a coating to increase the sealing property, the coating increases the production cost, the weight and the volume after the coating are increased, the flexibility is poor, the coating is uneven, the sealing property is poor, and the potential safety hazard exists.
Disclosure of Invention
Aiming at the problems, the invention provides a nylon 66 high-air-tightness air bag yarn and a preparation method thereof. The shrinkage rate of the airbag yarn prepared by the method is about 100% higher than that of the common airbag yarn, the airbag has higher density and air tightness due to large shrinkage rate, the obtained airbag cloth can meet the requirement of service performance without a coating, and the airbag cloth has good development prospect.
The invention is realized by the following technical scheme
A preparation method of nylon 66 high-air-tightness air bag yarn comprises the steps of carrying out polymerization tackifying, melt extrusion, melt filtration and spinning, cooling forming, oiling, stretching shaping and winding on nylon 66 slices; polymerization tackifying, namely putting the chinlon 66 slices into a drying tower, drying for 15-35 hours at the temperature of 130-160 ℃, wherein the formic acid relative viscosity of the dried chinlon N66 slices is 2.4-2.6; the temperature of a pair of drawing rollers is 35-50 ℃, the temperature of a pair of drawing rollers is 190-.
According to the preparation method, the formic acid relative viscosity of the nylon 66 slices is 2.0-2.3.
According to the preparation method, nitrogen is adopted in a drying tower for drying.
The preparation method comprises the step of melt extrusion, wherein the slices after polymerization and tackifying are placed in a screw extruder and are subjected to melt extrusion at the temperature of 270-320 ℃.
The preparation method comprises the step of cooling and shaping the filament bundle sprayed by the spinneret plate by using cold air, wherein the air volume of the cold air is 700-1200 cubic meters per hour.
According to the preparation method, the oiling attachment amount is 0.5-3.0%.
In the preparation method, the drafting and shaping are carried out by secondary drawing with the total drawing multiple of 4.0-6.0 times, and the relaxation ratio between the third pair of rollers and the fourth pair of rollers is 0.93-0.99.
The preparation method has the winding speed of 2500-3500 m/min during winding.
The high-air-tightness air bag yarn prepared by the preparation method.
The application of the air bag wire in the automobile safety air bag.
Compared with the prior art, the invention has the following positive beneficial effects
The lower the content of mechanical impurities and gel particles in the melt, the better the rheological property of the melt, the narrower the relative molecular mass distribution, the better the viscoelasticity of the melt, the enhanced spinnability and the benefit to stretching. The method firstly finely filters the melt, reduces the content of high-viscosity melt polymer impurities, and enables the stretching process to be smoothly realized; and then the dry heat shrinkage rate of the obtained air bag filament is improved by controlling the stretching process and other processes, the dry heat shrinkage rate of the obtained air bag filament reaches 8.0-12.0%, and is improved by more than 100% compared with the dry heat shrinkage rate of the air bag filament of 3.0-6.0% in the prior art, coating is not needed on the air bag cloth, the consumption of manpower and material resources is saved, the consumption of raw materials is reduced, the production cost is reduced, and meanwhile, the influence caused by the coating is avoided (the weight and the volume are increased after the coating, the flexibility is poor, the sealing performance is poor due to the uneven coating, and potential safety hazards exist).
Therefore, the air bag wire can be well applied to the automobile industry and has good application prospect.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments for understanding the technical solutions of the present invention, but the present invention is not limited to the scope of the present invention. The spinning pack used in the melt filtration and spinning in the following examples is the spinning pack described in the patent application No. 201711233488.2.
Example 1
A preparation method of nylon 66 high-air-tightness air bag yarns comprises the following steps:
(1) solid-phase polymerization tackifying: putting the chinlon 66 slices with formic acid relative viscosity of 2.0 into a drying tower, drying with nitrogen for 18 hours at 130 ℃, wherein the nitrogen air volume is 700m3H, the relative viscosity of the dried slices obtained after drying is 2.40;
(2) melt extrusion: conveying the polymerized and tackified nylon 66 slices into a screw extruder for melt extrusion, wherein the temperature of the screw extruder is 270-320 ℃;
(3) melt filtration and spinning: filtering the molten and extruded chinlon 66 by a spinning assembly, and metering and spinning by a metering pump;
(4) and (3) cooling and forming: cooling the tows sprayed out by the spinneret plate, wherein the cold air quantity is 700 cubic meters per hour;
(5) oiling: oiling the cooled tows by an oil homogenizer, wherein the oil feeding amount is 2.0%;
(6) stretching and shaping: guiding the oiled tows by using a godet rod to a first-stage drawing roller, a second-stage drawing roller, a third-stage drawing roller and a fourth-stage drawing roller for drawing;
wherein the temperature of the first-stage drawing roller is 35 ℃, the temperature of the second-stage drawing roller is 190 ℃, the temperature of the third-stage drawing roller is 200 ℃, the temperature of the fourth-stage drawing roller is 120 ℃, the total stretching multiple is 5.0, and the relaxation ratio between the third pair of rollers and the fourth pair of rollers is 0.98;
(7) winding: and winding at 2500 m/min, and automatically detecting the broken filament condition of the filament bundle by a broken filament detector arranged on the winding machine.
The properties of the resulting balloon filaments are shown in table 1 below:
TABLE 1 detection Properties of the balloon yarn obtained in example 1
Example 2
A preparation method of nylon 66 high-air-tightness air bag yarns comprises the following steps:
(1) solid-phase polymerization tackifying: putting the chinlon 66 slices with the formic acid relative viscosity of 2.0 into a drying tower, drying for 20 hours at 138 ℃ by using nitrogen with the air volume of 720m3H, the relative viscosity of the dried slices obtained after drying is 2.45;
(2) melt extrusion: conveying the polymerized and tackified nylon 66 slices into a screw extruder for melt extrusion, wherein the temperature of the screw extruder is 270-320 ℃;
(3) melt filtration and spinning: filtering the molten and extruded chinlon 66 by a spinning assembly, and metering and spinning by a metering pump;
(4) and (3) cooling and forming: cooling the tows sprayed out by the spinneret plate, wherein the cold air quantity is 800 cubic meters per hour;
(5) oiling: oiling the cooled tows by an oil homogenizer, wherein the oil feeding amount is 2.0%;
(6) stretching and shaping: guiding the oiled tows by using a godet rod to a first-stage drawing roller, a second-stage drawing roller, a third-stage drawing roller and a fourth-stage drawing roller for drawing;
the temperature of the first-stage drawing roller is 40 ℃, the temperature of the second-stage drawing roller is 185 ℃, the temperature of the third-stage drawing roller is 180 ℃, the temperature of the fourth-stage drawing roller is 125 ℃, the total stretching multiple is 5.0, and the relaxation ratio between the third pair of rollers and the fourth pair of rollers is 0.97;
(7) winding: and winding at 2500 m/min, and automatically detecting the broken filament condition of the filament bundle by a broken filament detector arranged on the winding machine.
The properties of the resulting balloon filaments are shown in table 2 below:
table 2 detection properties of the balloon filaments obtained in example 2
Example 3
A preparation method of nylon 66 high-air-tightness air bag yarns comprises the following steps:
(1) solid-phase polymerization tackifying: putting the chinlon 66 slices with the formic acid relative viscosity of 2.0 into a drying tower, drying for 22 hours at 139 ℃ by using nitrogen with the nitrogen air volume of 740m3H, the relative viscosity of the dried slices obtained after drying is 2.48;
(2) melt extrusion: conveying the polymerized and tackified nylon 66 slices into a screw extruder for melt extrusion, wherein the temperature of the screw extruder is 270-320 ℃;
(3) melt filtration and spinning: filtering the molten and extruded chinlon 66 by a spinning assembly, and metering and spinning by a metering pump;
(4) and (3) cooling and forming: cooling the tows sprayed out by the spinneret plate, wherein the cold air quantity is 900 cubic meters per hour;
(5) oiling: oiling the cooled tows by an oil homogenizer, wherein the oil feeding amount is 2.0%;
(6) stretching and shaping: guiding the oiled tows by using a godet rod to a first-stage drawing roller, a second-stage drawing roller, a third-stage drawing roller and a fourth-stage drawing roller for drawing;
the temperature of the first-stage drawing roller is 45 ℃, the temperature of the second-stage drawing roller is 180 ℃, the temperature of the third-stage drawing roller is 170 ℃, the temperature of the fourth-stage drawing roller is 130 ℃, the total stretching multiple is 4.8, and the relaxation ratio between the third pair of rollers and the fourth pair of rollers is 0.96;
(7) winding: the winding is carried out at the speed of 2800 m/min, and a broken filament detector is arranged on a winding machine to automatically detect the broken filament condition of the filament bundle.
The properties of the resulting balloon filaments are shown in table 3 below:
table 3 detection properties of the balloon filaments obtained in example 3
Example 4
A preparation method of nylon 66 high-air-tightness air bag yarns comprises the following steps:
(1) solid-phase polymerization tackifying: putting the chinlon 66 slices with formic acid relative viscosity of 2.0 into a drying tower, drying with nitrogen for 24 hours at 140 ℃, wherein the air volume of the nitrogen is 780m3H, the relative viscosity of the dried slices obtained after drying is 2.50;
(2) melt extrusion: conveying the polymerized and tackified nylon 66 slices into a screw extruder for melt extrusion, wherein the temperature of the screw extruder is 270-320 ℃;
(3) melt filtration and spinning: filtering the molten and extruded chinlon 66 by a spinning assembly, and metering and spinning by a metering pump;
(4) and (3) cooling and forming: cooling the tows sprayed out by the spinneret plate, wherein the amount of cold air is 1000 cubic meters per hour;
(5) oiling: oiling the cooled tows by an oil homogenizer, wherein the oil feeding amount is 2.0%;
(6) stretching and shaping: guiding the oiled tows by using a godet rod to a first-stage drawing roller, a second-stage drawing roller, a third-stage drawing roller and a fourth-stage drawing roller for drawing;
the temperature of the first-stage drawing roller is 50 ℃, the temperature of the second-stage drawing roller is 175 ℃, the temperature of the third-stage drawing roller is 160 ℃, the temperature of the fourth-stage drawing roller is 130 ℃, the total stretching multiple is 4.8, and the relaxation ratio between the third pair of rollers and the fourth pair of rollers is 0.95;
(7) winding: the winding is carried out at the speed of 2800 m/min, and a broken filament detector is arranged on a winding machine to automatically detect the broken filament condition of the filament bundle.
The properties of the resulting balloon filaments are shown in table 4 below:
table 4 detection properties of the balloon filaments obtained in example 4
Example 5
A preparation method of nylon 66 high-air-tightness air bag yarns comprises the following steps:
(1) solid-phase polymerization tackifying: putting the chinlon 66 slices with the formic acid relative viscosity of 2.0 into a drying tower, drying for 25 hours at 142 ℃ by using nitrogen with the nitrogen air volume of 800m3H, the relative viscosity of the dried slices obtained after drying is 2.55;
(2) melt extrusion: conveying the polymerized and tackified nylon 66 slices into a screw extruder for melt extrusion, wherein the temperature of the screw extruder is 270-320 ℃;
(3) melt filtration and spinning: filtering the molten and extruded chinlon 66 by a spinning assembly, and metering and spinning by a metering pump;
(4) and (3) cooling and forming: cooling the tows sprayed out by the spinneret plate, wherein the cold air quantity is 900 cubic meters per hour;
(5) oiling: oiling the cooled tows by an oil homogenizer, wherein the oil feeding amount is 2.0%;
(6) stretching and shaping: guiding the oiled tows by using a godet rod to a first-stage drawing roller, a second-stage drawing roller, a third-stage drawing roller and a fourth-stage drawing roller for drawing;
wherein the temperature of the first-stage drawing roller is 50 ℃, the temperature of the second-stage drawing roller is 170 ℃, the temperature of the third-stage drawing roller is 150 ℃, the temperature of the fourth-stage drawing roller is 120 ℃, the total stretching multiple is 4.5, and the relaxation ratio between the third pair of rollers and the fourth pair of rollers is 0.94;
(7) winding: winding is carried out at the speed of 3100 m/min, and a broken filament detector is arranged on a winding machine to automatically detect the broken filament condition of the tows.
The properties of the resulting balloon filaments are shown in table 5 below:
TABLE 5 detection Properties of the balloon yarn obtained in example 5
Claims (10)
1. A preparation method of nylon 66 high-air-tightness air bag yarn is characterized by comprising the steps of carrying out polymerization tackifying, melt extrusion, melt filtration and yarn spraying on nylon 66 slices, cooling and forming, oiling, stretching and shaping and winding;
polymerization tackifying, namely putting the chinlon 66 slices into a drying tower, drying for 15-35 hours at the temperature of 130-160 ℃, wherein the formic acid relative viscosity of the dried chinlon N66 slices is 2.4-2.6; the temperature of a pair of drawing rollers is 35-50 ℃, the temperature of a pair of drawing rollers is 190-.
2. The preparation method of claim 1, wherein the relative formic acid viscosity of the chinlon 66 slices is 2.0-2.3.
3. The method according to claim 1, wherein the drying is performed in a drying tower using nitrogen gas.
4. The preparation method as claimed in claim 1, wherein the melt extrusion is carried out by placing the polymerized and tackified slices in a screw extruder at 270-320 ℃.
5. The preparation method as claimed in claim 1, wherein the cooling shaping is to cool the filament bundle ejected from the spinneret plate with a cool wind, and the cool wind rate is 700-1200 cubic meters/hour.
6. The method according to claim 1, wherein said oil adhesion amount is 0.5-3.0%.
7. The process according to any one of claims 1 to 6, wherein the secondary drawing is conducted by a total drawing ratio of 4.0 to 6.0, and a relaxation ratio between the third pair of rolls and the fourth pair of rolls is 0.93 to 0.99.
8. The method as claimed in claim 1, wherein the winding speed is 2500-3500 m/min.
9. A high-airtightness air bag filament prepared by the preparation method according to any one of claims 1 to 8.
10. Use of the airbag filament of claim 9 in an automotive airbag.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011526679.XA CN112746337A (en) | 2020-12-22 | 2020-12-22 | Nylon 66 high-air-tightness air bag yarn and preparation method thereof |
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| CN202011526679.XA CN112746337A (en) | 2020-12-22 | 2020-12-22 | Nylon 66 high-air-tightness air bag yarn and preparation method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0350945A2 (en) * | 1988-07-15 | 1990-01-17 | E.I. Du Pont De Nemours And Company | Process for making monofilaments with high tenacity and high tensile uniformity |
| US6099963A (en) * | 1999-03-18 | 2000-08-08 | Alliedsignal Inc. | Sizeless yarn, a method of making it and a method of using it |
| JP2004156166A (en) * | 2002-11-06 | 2004-06-03 | Toray Ind Inc | Fabric and method for producing the same |
| CN1609300A (en) * | 2003-10-22 | 2005-04-27 | 株式会社晓星 | Low shrinkage polyamide fiber and uncoated fabric for airbags made of the same |
| CN1637178A (en) * | 2003-12-30 | 2005-07-13 | 株式会社晓星 | Polyamide fiber for uncoated airbags |
| CN101864634A (en) * | 2009-04-15 | 2010-10-20 | 东丽纤维研究所（中国）有限公司 | Fabric for airbags |
| CN103184544A (en) * | 2011-12-30 | 2013-07-03 | 海安县兄弟合成纤维有限公司 | Production method of nylon-66 low-denier yarn |
| CN108048921A (en) * | 2017-11-30 | 2018-05-18 | 神马实业股份有限公司 | A kind of production method of 66 industrial yarn of superelevation fracture strength polyamide fibre |
-
2020
- 2020-12-22 CN CN202011526679.XA patent/CN112746337A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0350945A2 (en) * | 1988-07-15 | 1990-01-17 | E.I. Du Pont De Nemours And Company | Process for making monofilaments with high tenacity and high tensile uniformity |
| US6099963A (en) * | 1999-03-18 | 2000-08-08 | Alliedsignal Inc. | Sizeless yarn, a method of making it and a method of using it |
| JP2004156166A (en) * | 2002-11-06 | 2004-06-03 | Toray Ind Inc | Fabric and method for producing the same |
| CN1609300A (en) * | 2003-10-22 | 2005-04-27 | 株式会社晓星 | Low shrinkage polyamide fiber and uncoated fabric for airbags made of the same |
| CN1637178A (en) * | 2003-12-30 | 2005-07-13 | 株式会社晓星 | Polyamide fiber for uncoated airbags |
| CN101864634A (en) * | 2009-04-15 | 2010-10-20 | 东丽纤维研究所（中国）有限公司 | Fabric for airbags |
| CN103184544A (en) * | 2011-12-30 | 2013-07-03 | 海安县兄弟合成纤维有限公司 | Production method of nylon-66 low-denier yarn |
| CN108048921A (en) * | 2017-11-30 | 2018-05-18 | 神马实业股份有限公司 | A kind of production method of 66 industrial yarn of superelevation fracture strength polyamide fibre |
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Application publication date: 20210504 |