CN101629330B - Method for drawing ultra-high molecular weight polyethylene fiber - Google Patents

Method for drawing ultra-high molecular weight polyethylene fiber Download PDF

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CN101629330B
CN101629330B CN2008101335613A CN200810133561A CN101629330B CN 101629330 B CN101629330 B CN 101629330B CN 2008101335613 A CN2008101335613 A CN 2008101335613A CN 200810133561 A CN200810133561 A CN 200810133561A CN 101629330 B CN101629330 B CN 101629330B
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molecular weight
weight polyethylene
fiber
positive
ultra
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CN2008101335613A
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CN101629330A (en
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周成程
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宁波荣溢化纤科技有限公司
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Abstract

The invention discloses a method for drawing ultra-high molecular weight polyethylene fiber, which comprises the step of: imposing at least two stages of positive drawing with the total drawing ratio of between 5 and 60 times on dried ultra-high molecular weight polyethylene gel protofilaments at a temperature of between 70 and 160 DEG C to obtain the ultra-high molecular weight polyethylene fiber. The method is characterized in that the negative drawing with the drawing ratio less than 1 time is also imposed on the gel protofilaments at a temperature of between 120 and 150 DEG C between the two stages of positive drawing. The fiber can produce the internal stress which affects the mechanical properties under the condition of large tensile deformation, and the gel protofilaments can perform thermal contraction deformation under the action of the internal stress under the condition of high-temperature negative drawing, so the internal stress of the fiber can be effectively released, and the mechanical properties of the fiber can be improved.

Description

A kind of method for drawing ultra-high molecular weight polyethylene fiber
Technical field
The present invention relates to the drawing of fiber method, be specifically related to method for drawing ultra-high molecular weight polyethylene fiber.
Background technology
That superhigh molecular weight polyethylene fibers also claims is high-strength, high-modulus polyethylene (UHMWPE) fiber or extended chain (ECPE) fiber, is meant that relative molecular mass is in (1~7) * 10 6Polyethylene, the ultra high molecular weight polyethylene fiber of after spinning-super drawing, making.It is the third generation high-performance fiber after carbon fiber, aramid fiber.
The superhigh molecular weight polyethylene fibers reinforced composite is compared with other fibre reinforced composites, has light weight, shock-resistant, dielectric properties advantages of higher, is bringing into play very important effect in fields such as Aero-Space, marine site defence, weaponrys.Simultaneously, this fiber also has broad application prospects in fields such as automobile, boats and ships, medicine equipment, athletic sports appliances.Therefore, superhigh molecular weight polyethylene fibers just enjoys attention from coming out, and develops very fast.
1979, Holland DSM N. V. has applied for adopting the gel spinning technology to make the patent of superhigh molecular weight polyethylene fibers (US4344908, special public clear 64-8732, US4422993), in existing gel spinning technology, superhigh molecular weight polyethylene fibers is made the strand typing through spinning pack, make big minute subsolution in the solution twine state and preserved, make the strand typing through quenching then.In order to improve the quality of nascent strand, in flue, cooling off on the basis of spinning technique of DSM N. V.'s invention by air, people have done a lot of improvement to the gel spinning technology, the advanced row of the strand short distance air cooling of will coming into being of the allied signal of the U.S. (Allied Signal) company enters cold rinse bank then and cools off the formation gel fiber fast.Because comprising a large amount of solvents in the gel fiber, when stretching, the plasticization of solvent makes macromolecular chain produce relative slippage, can reduce the validity of stretching; And because the existence of solvent, it is very big how many draw ratios of frozen glue precursor is influenced by solvent, causes the stretching stability of frozen glue precursor to reduce, and therefore needed to remove the solvent in the precursor before surpassing times hot-stretch.
The general solvent that adopts in the extraction process removal fiber frozen glue precursor, people select to have the volatile organic solvent of excellent compatibility as extractant and strand reaction with solvent, solvent exchange is come out, and then the strand after the extraction carried out drying at a certain temperature, carry out follow-up super times hot-stretch again after making extractant volatilization.Because solvent has been displaced and, therefore when surpass times hot-stretch, on the basis that fibre crystallinity and the degree of orientation improve, making the PE sheet crystal orientation extended chain conversion that is folded chain, thereby obtain high-strength, high-modulus polyethylene fiber.
Under prior art, the super times hot-stretch of superhigh molecular weight polyethylene fibers is carried out multistage hot-stretch with fiber by a plurality of hot paths and is realized, drawing machine generally adopts the hot-rolling drawing machine to preheating and the insulating process of fiber in the middle of stretching, in the process of the stretching of each grade, because the stretcher strain that the fiber experience is excessive, therefore can produce bigger internal stress at fibrous inside, the existence meeting of internal stress significantly reduces the TENSILE STRENGTH of fiber, the deformation rate of fiber is descended, reduce the modulus of fiber.
Therefore need a kind of drafting method that can effectively discharge the fiber internal stress, improve the superhigh molecular weight polyethylene fibers of fibrous mechanical property.
Summary of the invention
The technical problem that the present invention solves is, a kind of drafting method that can effectively discharge the fiber internal stress, improve the superhigh molecular weight polyethylene fibers of fibrous mechanical property is provided.
In order to solve above technical problem, the invention provides a kind of drafting method of superhigh molecular weight polyethylene fibers, comprising that the super high molecular weight polyethylene gel precursor for the treatment of drawing-off applies always to lead at 70 ℃~160 ℃ obtains superhigh molecular weight polyethylene fibers after doubly being 2 times~60 times the positive drawing-off of two-stage at least, also comprises described frozen glue precursor is applied the negative drawing-off of leading doubly less than 1 times at 120 ℃~150 ℃ between the positive drawing-off of described two-stage.
Herein, described dried superhigh molecular weight polyethylene fibers frozen glue precursor is meant the frozen glue precursor that obtains after the ultra-high molecular weight polyethylene spinning solution is through gel spinning, extraction, drying.Described gel spinning method can prepare by for example gel spinning technology described in patent GB2042414A or the WO01/73173.When the preparation ultra-high molecular weight polyethylene precursor fiber, earlier ultra-high molecular weight polyethylene powder and solvent swelling are obtained spinning solution through double screw extruder extruding dissolving, again spinning solution is adopted the gel spinning technology to prepare ultra-high molecular weight polyethylene gel fiber.Therefore, described ultra-high molecular weight polyethylene powder is weight average molecular weight (M w) be (1~7) * 10 6Linear ultra-high molecular weight polyethylene, preferred, weight average molecular weight is (1.5~4.5) * 10 6, preferred, weight average molecular weight is (1.8~4.0) * 10 6The powder size of described ultra-high molecular weight polyethylene is 40 μ m (micron)~200 μ m, and preferred, described ultra-high molecular weight polyethylene powder size is 80 μ m~180 μ m.
According to method of the present invention, described solvent as the ultra-high molecular weight polyethylene spinning solution is to be the hydrocarbon of liquid under the room temperature, preferably, can be hydrogenated naphthalene or alkane series, for example can be selected from one or more the solvents in tetrahydronaphthalene, decahydronaphthalenes, kerosene, paraffin oil or the paraffin as ultra-high molecular weight polyethylene, preferred, can select molecular weight for use is 40~1000 the paraffin oil solvent as ultra-high molecular weight polyethylene.The percentage by weight of ultra-high molecular weight polyethylene is 4%~25% in the spinning solution, and preferred, the percentage by weight of ultra-high molecular weight polyethylene is 5%~19%, and is preferred, and the percentage by weight of ultra-high molecular weight polyethylene is 7%~15%.
According to the present invention, the spinning solution for preparing described ultra-high molecular weight polyethylene gel fiber is that the suspension after employing double screw extruder extruding described ultra-high molecular weight polyethylene of dissolving and the solvent swelling is made.The inlet temperature of described suspension feeding double screw extruder is 90 ℃~120 ℃, 160 ℃~200 ℃ of the temperature of middle extruding dissolving, and outlet temperature is 150 ℃~190 ℃; The time of staying of suspension in twin-screw, preferred, the time of staying is 3~8 minutes, and was preferred in order to be no more than 10 minutes, and the time of staying is 4~6 minutes; The rotary speed of double screw extruder is 30r/min~300r/min (branch/commentaries on classics), and preferred, rotary speed is 70r/min~270r/min, and is preferred, and rotary speed is 90r/min~200r/min.
According to the present invention, prepare described ultra-high molecular weight polyethylene gel fiber and adopt following spinning technique: the aperture of spinneret orifice is 0.6mm~5.0mm, spinneret orifice draw ratio L/D is 6/1~30/1, the spinning solution rate of extrusion is 0.5m/min (meter/minute)~5m/min, spinning solution forms gel fiber through 20 ℃~60 ℃ cooling and shaping with the jet stretch that is no more than 2 times.Then the polyethylene fiber gel fiber is adopted the solvent in the gel fiber of extraction process place to go.Used extractant should have good mixing mutually or compatibility to solvent, and has low boiling point and high volatility.Used extractant can be volatile lower paraffin hydrocarbon or halogenated hydrocarbons, for example when using paraffin oil as solvent, can select for use hexane, heptane, toluene, chloromethanes, solvent wet goods as extractant, and is preferred, selects for use industrial naptha as extractant.The polyethylene fiber gel fiber carries out drying to it and makes the extractant volatilization make super high molecular polyethylene fiber precursor through after extracting in 40 ℃~80 ℃ temperature range.
Precursor applies always to lead at 70 ℃~160 ℃ to precursor again and obtains superhigh molecular weight polyethylene fibers after doubly being 5 times~60 times positive drawing-off after super-dry.In order to improve the mechanical property of fiber, can to the frozen glue precursor at least the just stretching of two-stage make the super high molecular weight fiber.The present invention can be the drawing machine well known to those skilled in the art that contains a plurality of carry-over pinch rolls commonly used in the fields such as spinning, high-performance fiber for drawing machine and without particular limitation, and for the number of the roller of drawing machine, the present invention is also without particular limitation.For with the fiber preheating, make its easy stretcher strain, therefore the carry-over pinch rolls before hot path can be hot-rolling, for the temperature of carry-over pinch rolls, can be close or equate with the temperature in the hot path of next stage.Among the present invention, the temperature that surpasses times hot-stretch is 70 ℃~160 ℃.When fiber is applied drawing-off, need under the condition of heating, carry out, therefore the pipe that makes the both ends open that precursor passes, casing, cylinder etc. are arranged between drawing machine, feed the gas that needs temperature then therein, the cylinder that the length that hot herein path, path promptly instigate fiber to pass can be regulated, but be not limited thereto.The speed and the ratio that feeds drawing machine speed before that doubly is meant after fiber passes through the drawing machine drawing-off of leading of the present invention.Positive drawing-off of the present invention is meant the drawing-off of leading doubly greater than 1 times, for example, fiber is during with the speed of 10m/s (meter per second) feeding drawing machine, when if drawing machine applies 1.2 times drawing-off to fiber, the linear velocity that is carry-over pinch rolls on the drawing machine is 12m/s, fiber is 10m/s (meter per second) * 1.2 times=12 meter per seconds just through the speed behind the drawing machine, and this moment, fiber passed through 1.2 times positive drawing-off.When positive drawing-off, the gel fiber fiber is elongated, and cross-sectional area reduces, the macromolecular chain of fibrous inside stretches high along the drawing-off direction, draw close mutually between the macromolecular chain, and active force each other increases, the degree of orientation of fiber and degree of crystallinity increase, and therefore can give fiber very high tensile property.When gel fiber was applied multistage drafting, along with the increase of fibre deformation rate, the difficulty of back level drawing-off increased, and needs elevated temperature to make fibre deformation, and when therefore carrying out multistage positive drawing-off, temperature is along with the increase of progression raises.When carrying out positive drawing-off, for the length in hot path, the present invention is also without particular limitation, the length in hot path is long more, the meeting of fiber heating is more abundant, but long hot path can increase entreprise cost, increases plant area, generally speaking, the total length in the positive hot path of drawing-off is 1m~100m, and preferred, the total length in hot path is 1m~50m, preferred, the total length in hot path is 1m~40m.
Because large deformation can take place in the frozen glue precursor under the situation about just stretching of leading more greatly doubly, therefore the superhigh molecular weight polyethylene fibers that obtains is inner can residually bigger internal stress, this internal stress can reduce the mechanical property of fiber, and making the fibrous mechanical property instability, the coefficient of variation that is embodied in various performances is bigger.Therefore, in order effectively to discharge the internal stress of fiber, the invention provides when carrying out multistage positive drawing-off, between positive drawing-off, can apply the negative drawing-off of leading doubly at 120 ℃~150 ℃ to the frozen glue precursor less than 1 times, negative drawing-off of the present invention is meant the drawing-off of leading doubly less than 1 times, for example, fiber is during with the speed of 10m/s feeding drawing machine, when if drawing machine applies 0.9 times drawing-off to fiber, the linear velocity that is carry-over pinch rolls on the drawing machine is 9m/s, fiber is 10m/s (meter per second) * 0.9 times=9 meter per seconds just through the speed behind the drawing machine, and this moment, fiber passed through 0.9 times negative drawing-off.Under the condition of the negative drawing-off of high temperature, stretcher strain can not take place in the frozen glue precursor, but the thermal contraction distortion takes place under the effect of internal stress, therefore can discharge internal stress.Preferably, the temperature of bearing drawing-off is 120 ℃~145 ℃, and is preferred, and the temperature of bearing drawing-off is 125 ℃~140 ℃.When the frozen glue precursor was applied negative drawing-off, preferably negative leading of drawing-off doubly is 0.8 times~0.99 times, and be preferred, and negative leading of drawing-off doubly is 0.9 times~0.98 times, and preferred, it doubly is 0.93 times~0.97 times that negative drawing-off must be led.For the frozen glue precursor is heated fully, the length of bearing the hot path of drawing-off is 1m~20m, and preferred, the length of bearing the hot path of drawing-off is 1m~10m, and preferred, the length in hot path is 2m~9m.Because the positive drawing-off to ultra-high molecular weight polyethylene can be multistage, therefore for stress is relaxed, also can carry out multistage negative drawing-off, promptly after the positive drawing-off of each level, can carry out the negative drawing-off of one-level.
Dried super high molecular weight polyethylene gel precursor is carried out drawing-off can specifically comprise step:
A) to dried super high molecular weight polyethylene gel precursor 70 ℃~110 ℃ positive drawing-offs of the first order that apply 1.5 times~10 times, preferred, the temperature of first order drawing-off is 90 ℃~110 ℃, and is preferred, leading of first order drawing-off doubly is 4~8 times;
B) the frozen glue precursor after the first order drawing-off is applied the negative drawing-off of leading doubly less than 1 times at 120 ℃~150 ℃;
C) the frozen glue precursor after the negative drawing-off is obtained superhigh molecular weight polyethylene fibers at 110 ℃~160 ℃ after applying 1.5 times~10 times the positive drawing-off in the second level, preferably, the temperature of carrying out second level drawing-off is 115 ℃~150 ℃, and is preferred, and carrying out leading of second level drawing-off doubly is 2 times~8 times.
In order to make fiber keep macromolecular orientation and stretching structure to room temperature, make fiber keep high-performance, therefore the superhigh molecular weight polyethylene fibers that obtains after the drawing-off need be cooled off at 5 ℃~20 ℃.For cooling means, the present invention is also without particular limitation, can use cold water, and preferred, serviceability temperature is that 5 ℃~20 ℃ cold carry-over pinch rolls cool off.In the present invention, the fiber that obtains behind 5 ℃~20 ℃ the cold carry-over pinch rolls counter extensioin in the end being set on the drawing machine of one-level cools off.
The invention provides a kind of superhigh molecular weight polyethylene fibers drawing process.The present invention obtains superhigh molecular weight polyethylene fibers by carrying out multistage positive drawing-off, and applies the negative drawing-off of leading doubly less than 1 times at 120 ℃~150 ℃ between positive drawing-off.Because fiber is under the situation of big stretcher strain, the internal stress of the mechanical property that can exert an influence, and under the condition of the negative drawing-off of high temperature, the thermal contraction distortion can take place in the frozen glue precursor under the effect of internal stress, therefore can effectively discharge internal stress, improve fibrous mechanical property.
Description of drawings
Fig. 1 is the method for drawing ultra-high molecular weight polyethylene fiber flow chart that the embodiment of the invention 1~embodiment 5 provides;
Fig. 2 is the method for drawing ultra-high molecular weight polyethylene fiber schematic diagram that the embodiment of the invention 1~embodiment 5 provides;
Fig. 3 is the method for drawing ultra-high molecular weight polyethylene fiber schematic diagram that the embodiment of the invention 6~embodiment 10 provides.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, but should be appreciated that these describe just to further specifying the features and advantages of the present invention, rather than to the restriction of claim scope of the present invention.
For better relatively drawing effect, in following embodiment and comparative example all with following identical prepared supra polymer two polyethylene fiber gel fibers, comparative test result under different stretching conditions then.The weight average molecular weight M of used ultra high molecular polyethylene WBe 2.4 * 10 6, powder size is 80 μ m~120 μ m, and solvent for use is permeability paraffin oil (η=7.5), and used extractant is No. 120 solvent naphthas.
With the antioxidant 2 of ultra-high molecular weight polyethylene, paraffin oil and 0.5wt%, 6-two 2-methyl-2-phenylpropane phenol mix swelling, and sending into double screw extruder extruding dissolving again, to make the ultra-high molecular weight polyethylene percentage by weight be 8% transparent gel spinning solution.Wherein mouthful temperature of sending into of double screw extruder is that 100 ℃, medium temperature are that 185 ℃, outlet temperature are 165 ℃, and the time that stops in double screw extruder is 5 minutes, and the twin-screw rotary speed is 180r/min.Suspension twines, extrudes and make transparent gel spinning solution through separating of twin-screw.
Again gel spinning solution is extruded to enter with the spray silk speed of 1m/min from the spinnerets with 400 holes through measuring pump, spinning pack and solidify tank, the jet stretch that applies 1.6 times obtains solidifying strand, wherein the aperture of spinnerets is 0.8mm, draw ratio L/D is 10/1, with making gel fiber through 55 ℃ and 60 ℃ of two-stage dryings respectively after the extraction of No. 120 solvent naphthas of coagulated yarn strip adoption, be the contrast that raw material carries out following examples and comparative example then with the gel fiber.
Fibrous mechanical property in embodiment and the comparative example is tested as follows: adopt the DXLL-20000 electronic tensile machine to measure the intensity and the modulus of fiber, test condition is for pressing from both sides apart from 250mm decrease speed 50mm/min.
In order to estimate stretching to the inhomogeneity influence of fibrous mechanical property, the present invention adopts and handles test result in the following method:
The performance number of each sample: get X 1, X 2... X nBe total to the performance number of n sample; Sample performance is got arithmetic mean of instantaneous value promptly:
X = Σ i = 1 n X i n -------------------------------------formula 1
In the formula 1: X i---the performance number of each sample,
N---sample number;
Standard deviation (S) adopts following method:
S = Σ i = 1 n ( X - X i ) 2 n - 1 -------------------------------------formula 2
Symbol cotype formula 1 in the formula 2;
Coefficient of dispersion (CV) adopts following method:
CV = S X × 100 % -------------------------------------formula 3
Symbol cotype formula 2 in the formula 3.
Embodiment 1
Referring to Fig. 1 and Fig. 2, Fig. 1 is a method for drawing ultra-high molecular weight polyethylene fiber flow chart in the present embodiment, and Fig. 2 is a method for drawing ultra-high molecular weight polyethylene fiber schematic diagram in the present embodiment.
Dried super high molecular weight polyethylene gel precursor is fed seal wire rod machine 101, the first hot path 102, first drawing machine, 103, the second hot path 104, second drawing machine the 105, the 3rd hot path 106, the 3rd drawing machine 106 successively.
S101 is applied to the frozen glue precursor by first drawing machine that to lead doubly be 5.8 times the positive drawing-off of the first order;
S102 is applied to the frozen glue precursor by second drawing machine that to lead doubly be 0.95 times negative drawing-off;
S103 is applied to the frozen glue precursor by the 3rd drawing machine that to lead doubly be 7 times the positive drawing-off in the second level;
S104 adopts receipts silk device 110 to receive silk and obtains superhigh molecular weight polyethylene fibers.
Wherein, the length in the first hot path is 5 meters, and temperature is 100 ℃; The length in the second hot path is 5 meters, and temperature is 125 ℃; The length in the 3rd hot path is 5 meters, and temperature is 135 ℃.First drawing machine, second drawing machine, the 3rd drawing machine all are five roller drawing machines.Deflector roll temperature on the godet roller machine 101 is 100 ℃, and the carry-over pinch rolls temperature of first drawing machine is 100 ℃, and the carry-over pinch rolls temperature of second drawing machine is 125 ℃, and the carry-over pinch rolls temperature of the 3rd drawing machine is 15 ℃.
The frozen glue precursor is respectively through obtaining superhigh molecular weight polyethylene fibers after the positive drawing-off of the first order, the negative drawing-off of the first order, the positive drawing-off in the second level.
Mechanics Performance Testing is carried out in sampling to fiber, gets ten samples at every turn, and results averaged is with the table 2 that the results are shown in after drawing and calculating.
Embodiment 2~embodiment 5 also adopts positive drawing-off of two-stage and the negative drawing-off of the one-level between the positive drawing-off of two-stage, and technological parameter sees Table 1, and test and result of calculation see Table 2.The identical of comparative example 1, comparative example 2 and above embodiment is in all having passed through the positive drawing-off of two-stage, still negative drafting process, and concrete technological parameter sees Table 1, and test and result of calculation see Table 2.
Embodiment 6
Referring to Fig. 3, be method for drawing ultra-high molecular weight polyethylene fiber schematic diagram in the present embodiment.Dried super high molecular weight polyethylene gel precursor is fed seal wire rod machine 101 successively, the first hot path 102, first drawing machine 103, the second hot path 104, second drawing machine 105, the 3rd hot path 106, the 3rd drawing machine 107, the 4th hot path 108, the 4th drawing machine 109, after the frozen glue precursor applies the positive drawing-off of 2.1 times and 2.6 times respectively by first drawing machine and second drawing machine, apply 0.96 times negative drawing-off by the 3rd drawing machine, apply 3.2 times positive drawing-off by the 4th drawing machine again and obtain superhigh molecular weight polyethylene fibers, adopt at last and receive silk device 110 and receive silk.Wherein, the length in the first hot path is 5 meters, and temperature is 100 ℃; The length in the second hot path is 5 meters, and temperature is 125 ℃; The length in the 3rd hot path is 5 meters, and temperature is 130 ℃; The length in the 4th hot path is 5 meters, and temperature is 135 ℃.First drawing machine, second drawing machine, the 3rd drawing machine all are five roller drawing machines.Deflector roll temperature on the godet roller machine is 100 ℃, and the carry-over pinch rolls temperature of first drawing machine is 125 ℃, and the carry-over pinch rolls temperature of second drawing machine is 130 ℃, and the carry-over pinch rolls temperature of the 3rd drawing machine is 135 ℃, and the carry-over pinch rolls temperature of the 4th drawing machine is 16 ℃.
Gel fiber has passed through the positive drawing-off of two-stage earlier, passes through the negative drawing-off of one-level then, and the negative drawing-off through one-level obtains superhigh molecular weight polyethylene fibers again.
Embodiment 7 is identical with the drawing-off mechanism of embodiment 6 with embodiment 8, and promptly the frozen glue precursor obtains superhigh molecular weight polyethylene fibers through the negative drawing-off of positive drawing-off, one-level of two-stage, the positive drawing-off of afterbody successively; Embodiment 9 and embodiment 10 pass through the level Four drawing-off altogether, and drawing machine is made as the frozen glue precursor and obtains superhigh molecular weight polyethylene fibers through the positive drawing-off of one-level, the negative drawing-off of one-level, the positive drawing-off of last two-stage successively; Comparative example 3 and comparative example 4 have all passed through three grades positive drawing-off, but do not obtain superhigh molecular weight polyethylene fibers through negative drawing-off.
The concrete technological parameter of embodiment 7~embodiment 10, comparative example 1 and comparative example 2 sees Table 1, and test and result of calculation see Table 2.
Table 1 drawing ultra-high molecular weight polyethylene fiber process parameter table
Continuous table 1 drawing ultra-high molecular weight polyethylene fiber process parameter table
The table 2 superhigh molecular weight polyethylene fibers embodiment and the comparative example performance table of comparisons
From above narration as can be seen, when superhigh molecular weight polyethylene fibers is carried out multistage positive drawing-off, if between positive drawing-off, apply negative drawing-off, owing to can discharge the stress of fibrous inside, therefore can obviously improve the TENSILE STRENGTH of fiber, and reduce the coefficient of variation.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (9)

1. method for drawing ultra-high molecular weight polyethylene fiber, comprise dried super high molecular weight polyethylene gel precursor applied always to lead at 70 ℃~160 ℃ obtaining superhigh molecular weight polyethylene fibers after doubly being 5 times~60 times the positive drawing-off of two-stage at least, it is characterized in that between the positive drawing-off of described two-stage, also comprising described frozen glue precursor is applied the negative drawing-off of leading doubly less than 1 times at 120 ℃~150 ℃;
Described drawing-off to the super high molecular weight polyethylene gel precursor specifically comprises step:
A) to dried super high molecular weight polyethylene gel precursor 70 ℃~110 ℃ positive drawing-offs of the first order that apply 1.5 times~10 times;
B) the frozen glue precursor after the first order drawing-off is applied the negative drawing-off of leading doubly less than 1 times at 120 ℃~150 ℃;
C) the frozen glue precursor after the negative drawing-off is obtained superhigh molecular weight polyethylene fibers at 110 ℃~160 ℃ after applying 1.5 times~10 times the positive drawing-off in the second level.
2. method according to claim 1, the temperature that it is characterized in that bearing in the step b) drawing-off is 120 ℃~145 ℃.
3. method according to claim 2, the temperature that it is characterized in that bearing in the step b) drawing-off is 125 ℃~140 ℃.
4. method according to claim 1 is characterized in that negative drawing-off in the step b) is to carry out in length is the hot path of 1m~20m.
5. method according to claim 4, the length that it is characterized in that the hot path in the step b) is 1m~10m.
6. method according to claim 1, it is characterized in that bearing in the step b) leading of drawing-off doubly is 0.8 times~0.99 times.
7. method according to claim 6, it is characterized in that bearing in the step b) leading of drawing-off doubly is 0.9 times~0.98 times.
8. method according to claim 1, the temperature that it is characterized in that carrying out in the step a) the positive drawing-off of the first order is 90 ℃~110 ℃.
9. method according to claim 1 is characterized in that comprising that also the superhigh molecular weight polyethylene fibers that will obtain after the drawing-off cools off at 5 ℃~20 ℃ after the step c).
CN2008101335613A 2008-07-17 2008-07-17 Method for drawing ultra-high molecular weight polyethylene fiber CN101629330B (en)

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CN101967691B (en) * 2010-09-21 2012-02-22 中国科学院宁波材料技术与工程研究所 Hot drafting method for ultra-high molecular weight polyethylene strands
CN103510233B (en) * 2012-06-22 2018-01-16 日本Tmt机械株式会社 Spin-drawing device
CN109208107A (en) * 2018-09-06 2019-01-15 山东莱威新材料有限公司 A kind of ultra-high molecular weight polyethylene slit fibre and preparation method thereof

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