CN101967691A - Hot drafting method for ultra-high molecular weight polyethylene strands - Google Patents
Hot drafting method for ultra-high molecular weight polyethylene strands Download PDFInfo
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- CN101967691A CN101967691A CN 201010288700 CN201010288700A CN101967691A CN 101967691 A CN101967691 A CN 101967691A CN 201010288700 CN201010288700 CN 201010288700 CN 201010288700 A CN201010288700 A CN 201010288700A CN 101967691 A CN101967691 A CN 101967691A
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Abstract
The invention relates to a hot drafting method for ultra-high molecular weight polyethylene strands. The prior art uses cold rolls or hot rolls singly, and has various problems. In the hot drafting method of the invention, the ultra-high molecular weight polyethylene strands are drafted by 2-5 levels of drafting for the total multiple of 10-60 times. The method of drafting of each level comprises the following steps: firstly, the ultra-high molecular weight polyethylene strands enter a hot box through a hot roll; after coming out of the hot box, the ultra-high molecular weight polyethylene strands enter the next level of drafting through a cold roll; and in all levels of drafting, the temperatures of the hot rolls and the hot boxes are gradually increased, and the drafting magnification of all levels of drafting is gradually reduced, wherein the temperature of the hot roll is 60-150 DEG C, the temperature of the hot box is 80-150 DEG C, and the temperature of the cold roll is 10-30 DEG C. The invention adopts a multilevel hot drafting method of using the hot roll before entering the hot box and using the cold roll after coming out of the hot box, is more favorable for stabilizing hot drafting and fixing a high oriented structure, improves the product quality, and obtains the ultra-high molecular weight polyethylene fiber with high strength and high module.
Description
Technical field
The invention belongs to technical field of polymer materials, relate to the hot drafting method of a kind of ultra-high molecular weight polyethylene (UHMWPE) precursor.
Technical background
Superhigh molecular weight polyethylene fibers is a kind of high-strength high-modulus polyethylene fiber that last century, industrialization was succeeded in developing and carried out in early eighties to late nineteen seventies.Superhigh molecular weight polyethylene fibers and carbon fiber, aramid fiber also are called three big high-performance fibers.Because superhigh molecular weight polyethylene fibers has ultralight, high specific strength, high ratio modulus, superior energy absorption, multiple excellent properties such as wear-resisting, corrosion-resistant, fast light preferably, has obtained in fields such as Aero-Space, national defense and military, security protection, ocean engineering, sports equipment, power communication, medical material and civilian nettings using widely.
Superhigh molecular weight polyethylene fibers normally forms by the gel spinning prepared.Gel spinning technology is earlier ultra-high molecular weight polyethylene and suitable solvent to be made spinning solution, generates gel fiber through after the extrusion molding then, again with the solvent extraction drying in the gel fiber, obtains superhigh molecular weight polyethylene fibers through surpassing a times hot-stretch at last.
Existing hot draft process normally all uses cold roller or all uses hot-rolling in the process of super doubly hot drawing-off.If all use cold roller because extraction dried precursor temperature before entering hot case is lower, enter hot case after, in the process of being stretched, the precursor temperature can not rise to and hot case environment facies temperature together immediately, so the tensile property of precursor is relatively poor, is prone to problems such as fracture of wire; If all use hot-rolling, precursor temperature after overheated drawing-off can not lower, and the high orientation texture that the elevated temperature heat drawing-off forms can not be fixed up, the mechanical property of the final fiber that forms of influence.Therefore, the hot drafting method that needs the ultra-high molecular weight polyethylene precursor fiber of a kind of production efficiency height, good product quality.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, and the hot drafting method of the ultra-high molecular weight polyethylene precursor fiber of a kind of production efficiency height, good product quality is provided.
It is 10～60 times drawing-off that hot drafting method of the present invention carries out general times by 2～5 grades of drawing-offs with ultra-high molecular weight polyethylene precursor fiber; The method of each grade drawing-off is: ultra-high molecular weight polyethylene precursor fiber at first enters hot case through hot-rolling, after coming out from hot case, enters the next stage drawing-off through cold roller again, and the temperature of hot-rolling and hot case raises step by step in the drawing-offs at different levels.
The described precursor of ultra-high molecular weight polyethylene precursor fiber for the treatment of drawing-off for obtaining after the extraction of ultra-high molecular weight polyethylene gel fiber process, the drying;
Described heat roller temperature is 60～150 ℃, and heater temperature is 80～150 ℃, and cold-roll temperature is 10～30 ℃;
The air motion direction is identical with the fiber movement direction in the described hot case;
The drawing-off multiplying power of described drawing-offs at different levels reduces step by step, and the drawing-off multiplying power of the hot drawing-off of back one-level is 0.5～0.98 with the ratio of the drawing-off multiplying power of the hot drawing-off of previous stage.
After adopting and enter the preceding use of hot case hot-rolling, come out from hot case, the present invention uses the multistage hot drafting method of cold roller, more help stablizing of hot drawing-off and fixing of high orientation texture, improve product quality, obtained the superhigh molecular weight polyethylene fibers of high strength (more than the 33cN/dtex) high-modulus (more than the 1100cN/dtex).
The specific embodiment
Further describe the working of an invention mode below by embodiment, but scope of the present invention not only is limited to this these case study on implementation, these case study on implementation of being given only are illustrative, and are unintelligible for being limitation of the present invention.The ordinary skill of this area is according to the content of invention, and some nonessential improvement and adjustment that invention is made still belong to protection scope of the present invention.
Embodiment 1
To extract dried ultra-high molecular weight polyethylene precursor fiber and carry out the two levels of thermal drawing-off, the method for each grade drawing-off is: ultra-high molecular weight polyethylene precursor fiber at first enters hot case through hot-rolling, after coming out from hot case, enters the next stage drawing-off through cold roller again.Wherein, the hot drawing-off heat roller temperature of one-level is 60 ℃, and heater temperature is 80 ℃, and cold-roll temperature is 10 ℃, and drafting multiple is 4 times; The hot drawing-off heat roller temperature of secondary is 80 ℃, and heater temperature is 110 ℃, and cold-roll temperature is 10 ℃, drafting multiple is 2.5 times, the draw ratio of hot drawing-off of secondary and the hot drawing-off of one-level is 0.625, and the total draft multiple is 10 times, obtains superhigh molecular weight polyethylene fibers after hot drawing-off.
Mechanics Performance Testing is carried out in sampling to fiber, gets 10 samples at every turn, and results averaged will the results are shown in table 1.
Embodiment 2
To extract dried ultra-high molecular weight polyethylene precursor fiber and carry out three grades of hot drawing-offs, the method for each grade drawing-off is: ultra-high molecular weight polyethylene precursor fiber at first enters hot case through hot-rolling, after coming out from hot case, enters the next stage drawing-off through cold roller again.Wherein, the hot drawing-off heat roller temperature of one-level is 60 ℃, heater temperature is 80 ℃, cold-roll temperature is 20 ℃, drafting multiple is 4 times, and the hot drawing-off heat roller temperature of secondary is 80 ℃, and heater temperature is 110 ℃, cold-roll temperature is 20 ℃, drafting multiple is 3 times, and the draw ratio of hot drawing-off of secondary and the hot drawing-off of one-level is that 0.75, three grade of hot drawing-off heat roller temperature is 110 ℃, heater temperature is 130 ℃, cold-roll temperature is 20 ℃, and drafting multiple is 2 times, and the draw ratio of three grades of hot drawing-offs and the hot drawing-off of secondary is 0.667, the total draft multiple is 24 times, obtains superhigh molecular weight polyethylene fibers after hot drawing-off.
Mechanics Performance Testing is carried out in sampling to fiber, gets 10 samples at every turn, and results averaged will the results are shown in table 1.
Embodiment 3
To extract dried ultra-high molecular weight polyethylene precursor fiber and carry out the hot drawing-off of level Four, the method for each grade drawing-off is: ultra-high molecular weight polyethylene precursor fiber at first enters hot case through hot-rolling, after coming out from hot case, enters the next stage drawing-off through cold roller again.Wherein, the hot drawing-off heat roller temperature of one-level is 60 ℃, heater temperature is 80 ℃, cold-roll temperature is 20 ℃, and drafting multiple is 4.2 times, and the hot drawing-off heat roller temperature of secondary is 80 ℃, heater temperature is 110 ℃, cold-roll temperature is 20 ℃, and drafting multiple is 3.4 times, and the draw ratio of hot drawing-off of secondary and the hot drawing-off of one-level is 0.86, three grades of hot drawing-off heat roller temperatures are 110 ℃, heater temperature is 130 ℃, and cold-roll temperature is 20 ℃, and drafting multiple is 2 times, the draw ratio of three grades of hot drawing-offs and the hot drawing-off of secondary is 0.59, the hot drawing-off heat roller temperature of level Four is 130 ℃, and heater temperature is 140 ℃, and cold-roll temperature is 20 ℃, drafting multiple is 1.4 times, the draw ratio of the hot drawing-off of level Four and three grades of hot drawing-offs is 0.7, and the total draft multiple is 40 times, obtains superhigh molecular weight polyethylene fibers after hot drawing-off.
Mechanics Performance Testing is carried out in sampling to fiber, gets 10 samples at every turn, and results averaged will the results are shown in table 1.
Embodiment 4
To extract dried ultra-high molecular weight polyethylene precursor fiber and carry out the hot drawing-off of Pyatyi, the method for each grade drawing-off is: ultra-high molecular weight polyethylene precursor fiber at first enters hot case through hot-rolling, after coming out from hot case, enters the next stage drawing-off through cold roller again.Wherein, the hot drawing-off heat roller temperature of one-level is 60 ℃, heater temperature is 80 ℃, and cold-roll temperature is 30 ℃, and drafting multiple is 4 times, the hot drawing-off heat roller temperature of secondary is 80 ℃, heater temperature is 110 ℃, and cold-roll temperature is 30 ℃, and drafting multiple is 3.92 times, the draw ratio of hot drawing-off of secondary and the hot drawing-off of one-level is 0.98, three grades of hot drawing-off heat roller temperatures are 110 ℃, and heater temperature is 130 ℃, and cold-roll temperature is 30 ℃, drafting multiple is 1.96 times, the draw ratio of three grades of hot drawing-offs and the hot drawing-off of secondary is 0.5, and the hot drawing-off heat roller temperature of level Four is 130 ℃, and heater temperature is 140 ℃, cold-roll temperature is 30 ℃, drafting multiple is 1.5 times, and the draw ratio of the hot drawing-off of level Four and three grades of hot drawing-offs is 0.77, and the hot drawing-off heat roller temperature of Pyatyi is 150 ℃, heater temperature is 150 ℃, cold-roll temperature is 30 ℃, and drafting multiple is 1.3 times, and the draw ratio of hot drawing-off of Pyatyi and the hot drawing-off of level Four is 0.87, the total draft multiple is 60 times, obtains superhigh molecular weight polyethylene fibers after hot drawing-off.
Mechanics Performance Testing is carried out in sampling to fiber, gets 10 samples at every turn, and results averaged will the results are shown in table 1.
Comparative example 1
To extract dried ultra-high molecular weight polyethylene precursor fiber and carry out three grades of hot drawing-offs, wherein, the hot drafting heat box temperature of one-level is 80 ℃, cold-roll temperature is 20 ℃, drafting multiple is 4 times, the hot drafting heat box temperature of secondary is 110 ℃, cold-roll temperature is 20 ℃, and drafting multiple is 3 times, and the draw ratio of hot drawing-off of secondary and the hot drawing-off of one-level is 0.75, three grades of hot drafting heat box temperature are 130 ℃, cold-roll temperature is 20 ℃, and drafting multiple is 2 times, and the draw ratio of three grades of hot drawing-offs and the hot drawing-off of secondary is 0.67, the total draft multiple is 24 times, obtains superhigh molecular weight polyethylene fibers after hot drawing-off.
Mechanics Performance Testing is carried out in sampling to fiber, gets 10 samples at every turn, and results averaged will the results are shown in table 1.
Comparative example 2
To extract dried ultra-high molecular weight polyethylene precursor fiber and carry out three grades of hot drawing-offs, wherein, the hot drawing-off heat roller temperature of one-level is 60 ℃, heater temperature is 80 ℃, drafting multiple is 4 times, the hot drawing-off heat roller temperature of secondary is 80 ℃, heater temperature is 110 ℃, and drafting multiple is 3 times, and the draw ratio of hot drawing-off of secondary and the hot drawing-off of one-level is 0.75, three grades of hot drawing-off heat roller temperatures are 110 ℃, heater temperature is 130 ℃, and drafting multiple is 2 times, and the draw ratio of three grades of hot drawing-offs and the hot drawing-off of secondary is 0.67, the total draft multiple is 24 times, obtains superhigh molecular weight polyethylene fibers after hot drawing-off.
Mechanics Performance Testing is carried out in sampling to fiber, gets 10 samples at every turn, and results averaged will the results are shown in table 1.
Table 1, superhigh molecular weight polyethylene fibers embodiment and the comparative example performance table of comparisons
Claims (4)
1. the hot drafting method of a ultra-high molecular weight polyethylene precursor fiber is characterized in that it is 10～60 times drawing-off that this hot drafting method carries out general times by 2～5 grades of drawing-offs with ultra-high molecular weight polyethylene precursor fiber; The method of each grade drawing-off is: ultra-high molecular weight polyethylene precursor fiber at first enters hot case through hot-rolling, after coming out from hot case, enters the next stage drawing-off through cold roller again, and the temperature of hot-rolling and hot case raises step by step in the drawing-offs at different levels;
Described heat roller temperature is 60～150 ℃, and heater temperature is 80～150 ℃, and cold-roll temperature is 10～30 ℃.
2. the hot drafting method of a kind of ultra-high molecular weight polyethylene precursor fiber as claimed in claim 1, it is characterized in that: the air motion direction is identical with the fiber movement direction in the described hot case.
3. the hot drafting method of a kind of ultra-high molecular weight polyethylene precursor fiber as claimed in claim 1, it is characterized in that: the drawing-off multiplying power of described drawing-offs at different levels reduces step by step, and the drawing-off multiplying power of the hot drawing-off of back one-level is 0.5～0.98 with the ratio of the drawing-off multiplying power of the hot drawing-off of previous stage.
4. the hot drafting method of a kind of ultra-high molecular weight polyethylene precursor fiber as claimed in claim 1 is characterized in that: the described precursor of ultra-high molecular weight polyethylene precursor fiber for obtaining after the extraction of ultra-high molecular weight polyethylene gel fiber process, the drying for the treatment of drawing-off.
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Cited By (5)
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| CN102864506A (en) * | 2012-09-26 | 2013-01-09 | 江苏纺科新复合材料有限公司 | Preparation method of amorphous high-oriented polyethylene filament |
| CN103510168A (en) * | 2012-06-21 | 2014-01-15 | 中国石油化工股份有限公司 | Drafting hot box device for ultra-high molecular weight polyethylene fibers |
| CN105346043A (en) * | 2015-12-08 | 2016-02-24 | 芜湖恒一塑料设备制造有限公司 | Multi-stage stretching device for plastic flat wires |
| CN113151912A (en) * | 2021-05-10 | 2021-07-23 | 浙江理工大学上虞工业技术研究院有限公司 | Ultra-high molecular weight polyethylene fiber and preparation method and application thereof |
| CN113355756A (en) * | 2020-03-07 | 2021-09-07 | 东部湾(扬州)生物新材料有限公司 | Preparation method of environment-friendly composite fiber for sanitary materials |
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| CN103510168A (en) * | 2012-06-21 | 2014-01-15 | 中国石油化工股份有限公司 | Drafting hot box device for ultra-high molecular weight polyethylene fibers |
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| CN105346043A (en) * | 2015-12-08 | 2016-02-24 | 芜湖恒一塑料设备制造有限公司 | Multi-stage stretching device for plastic flat wires |
| CN113355756A (en) * | 2020-03-07 | 2021-09-07 | 东部湾(扬州)生物新材料有限公司 | Preparation method of environment-friendly composite fiber for sanitary materials |
| CN113151912A (en) * | 2021-05-10 | 2021-07-23 | 浙江理工大学上虞工业技术研究院有限公司 | Ultra-high molecular weight polyethylene fiber and preparation method and application thereof |
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Application publication date: 20110209 Assignee: Jianqiao Science & Technology Co., Ltd. Assignor: Ningbo Institute of Material Technology and Engineering Chinese Academy of Scien Contract record no.: 2014320000055 Denomination of invention: Hot drafting method for ultra-high molecular weight polyethylene strands Granted publication date: 20120222 License type: Exclusive License Record date: 20140218 |
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