Summary of the invention
The technical problem that the present invention will solve is to provide a kind of light weight, intensity height and binding agent flowability not to influence the preparation method of the no latitude cloth of product quality.
In order to solve above technical problem, the invention provides the preparation method that a kind of ultra-high molecular weight polyethylene does not have latitude cloth, comprising:
A) superhigh molecular weight polyethylene fibers of 360D is arranged according to same direction, and with the thin polymer film bonding that contains binding agent;
B) 2~4 blocks of said thin polymer films that are bonded with fiber are stacked; Said two fibers that are bonded with in the thin polymer film of fiber are vertical each other;
C) the said thin polymer film that stacks is through compacting, and obtaining surface density is 135g/cm
2No latitude cloth.
Preferably, the preparation method of the superhigh molecular weight polyethylene fibers of said 360D is:
The ultra-high molecular weight polyethylene powder is obtained obtaining the spinning solution that concentration is 70wt%~97.6wt% through double screw extruder extruding dissolving again behind the spinning solution by mixing through swelling with solvent; Said solvent is to be the hydrocarbon of liquid under the room temperature;
Said spinning solution is obtained gel fiber through spray silk, cooling;
Said gel fiber is dry through washing oil washing back, obtain as-spun fibre;
Said as-spun fibre is stretched through 5 roads, obtain the superhigh molecular weight polyethylene fibers that fiber number is 360D; Said draw ratio is 8~10 times.
Preferably, said stretching is in temperature is 70~130 ℃ path, to carry out.
Preferably, stretch described in is in temperature is 90~110 ℃ path, to carry out.
Preferably, said solvent is selected from one or more in tetrahydronaphthalene, decahydronaphthalenes, kerosene, No. 7 solvent naphthas or the paraffin.
Preferably, said solvent is that molecular weight is 40~1000 No. 7 solvent naphthas.
Preferably, said binding agent is polystyrene triblock copolymer, hydrogenated polystyrene triblock copolymer or epoxy resin.
Preferably, the temperature of said compacting is 40~60 ℃.
Preferably, the pressure of said compacting is 5~8MPa.
Preferably, the time of said compacting is 100~180s.
The invention provides a kind of ultra-high molecular weight polyethylene does not have the preparation method of latitude cloth, comprising: a) superhigh molecular weight polyethylene fibers of 360D is arranged according to same direction, and with the thin polymer film bonding that contains binding agent; B) 2~4 blocks of said thin polymer films that are bonded with fiber are stacked; Said two fibers that are bonded with in the thin polymer film of fiber are vertical each other; C) the said thin polymer film that stacks is through compacting, and obtaining surface density is 135g/cm
2No latitude cloth.The bright preparation method who provides of this law; Use contains the thin polymer film bonding ultra-high molecular weight polyethylene of binding agent; Because the binding agent on the said thin polymer film is adhesive coated uniformly for applying in advance; So when viscose fibre, not can owing to the mobile deficiency of binding agent with to produce local bonding insecure, and cause local stress defective.What the present invention used in addition is the superhigh molecular weight polyethylene fibers of 360D, and intensity is more than 37g/dtex, and modulus is more than 1300g/dtex, and the no latitude cloth fabric width of preparation can reach 1.6m, and surface density is 135g/cm
2So under the standard of joint product, the ballistic resistant products of using no latitude cloth provided by the invention to make is more frivolous, but intensity improved, and increased the security and the mobility of wearing said ballistic resistant products personnel of ballistic resistant products.
The specific embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiments of the invention are described, but should be appreciated that these just restriction for further specifying feature and advantage of the present invention rather than patent of the present invention being required is described.
In order to reach the object of the invention, the present invention preferably prepares superhigh molecular weight polyethylene fibers.
Said ultra-high molecular weight polyethylene powder is that weight average molecular weight (Mw) is the linear ultra-high molecular weight polyethylene of (1~7) * 106; Preferably; Said ultra-high molecular weight polyethylene is that weight average molecular weight is the linear ultra-high molecular weight polyethylene of (1.5~4.5) * 106; Preferred, the weight average molecular weight of said ultra-high molecular weight polyethylene is the linear ultra-high molecular weight polyethylenes in (1.8~4.0) * 106.The powder size of said ultra-high molecular weight polyethylene is 40 μ m~200 μ m, and preferred, said ultra-high molecular weight polyethylene powder size is 80 μ m~180 μ m.
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 solvents as ultra-high molecular weight polyethylene in tetrahydronaphthalene, decahydronaphthalenes, kerosene, mineral oil or the paraffin, preferred, can select molecular weight for use is 40~1000 No. 7 white oils solvents as ultra-high molecular weight polyethylene.
According to the present invention; With said ultra-high molecular weight polyethylene and solvent swelling 20 minutes~60 minutes in temperature is 70 ℃~130 ℃ scope; Preferably, with said ultra-high molecular weight polyethylene and solvent swelling 25 minutes~55 minutes in temperature is 75 ℃~125 ℃ scope.In order to prepare the high super high molecular polyethylene solution of spinning property; The percentage by weight of ultra-high molecular weight polyethylene is 70wt%~97.6wt% in the spinning solution provided by the invention; Preferably; The percentage by weight of ultra-high molecular weight polyethylene is 70wt%~97.6wt% in the spinning solution, and is preferred, and the percentage by weight of ultra-high molecular weight polyethylene is 70wt%~97.6wt% in the spinning solution.
The ultra-high molecular weight polyethylene swelling is prepared after the spinning solution, need further to adopt double screw extruder push dissolving preparation spinning solution spinning solution.Wherein, the feeding mouth temperature of 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 spinning solution in double screw extruder, preferred, the time of staying of spinning solution in double screw extruder is 3~8 minutes, and be preferred in order to be no more than 10 minutes, and the time of staying of spinning solution in double screw extruder is 4~6 minutes; The rotary speed of double screw extruder is 30~300r/min, and preferred, the rotary speed of double screw extruder is 70~270r/min, and is preferred, and the rotary speed of double screw extruder is 90~200r/min.
After the preparation spinning solution, adopt gel spinning technology to use superhigh molecular weight polyethylene fibers spinning solution provided by the invention to prepare superhigh molecular weight polyethylene fibers.The process conditions of gel spinning are: the aperture of spinneret orifice is 0.6mm~5mm, and preferred, the aperture of spinneret orifice is 0.7mm~2mm; Spinneret orifice draw ratio L/D is 6/1~30/1, and the spinning solution rate of extrusion is 0.5m/min~5m/min, and spinning solution is through 20 ℃~60 ℃ cooling and shaping, and the shower nozzle drafting multiple is no more than 2 times; Preferably, the shower nozzle drafting multiple is no more than 1.8 times.
After the gel fiber moulding, said gel fiber left standstill obtained as-spun fibre in 16 hours~26 hours.
Preparation need extract as-spun fibre behind the as-spun fibre, dry, ultra times hot-stretch.
When as-spun fibre was extracted, the extractant of selecting for use should have good mixing mutually or intermiscibility for solvent, and has low boiling point and high volatility.Used extractant can be volatile lower paraffin hydrocarbon and halogenated hydrocarbons.For example when using paraffin oil, can select for use hexane, heptane, toluene, chloromethanes, solvent wet goods as extractant as solvent, preferred, select for use industrial naptha as extractant, most preferably be solvent naphtha No. 120.As-spun fibre carries out drying to it and makes the extractant volatilization, and then surpass a times hot-stretch through after extracting in 40 ℃~80 ℃ temperature range.
With being dried the extractant of removing on the as-spun fibre after the as-spun fibre extraction, baking temperature can be 40 ℃~90 ℃, and preferred, baking temperature is 50 ℃~70 ℃.Drying is carried out through the mode of dry combustion method, does not have liquid substance in the dry combustion method case, and solvent directly is evaporated to gas.Said dry combustion method operation is preferably through 3 road dry combustion method casees.After the drying, the temperature of carrying out the ultra times hot-stretch in 5 roads is 70 ℃~130 ℃, and is preferred, in 85 ℃~135 ℃ temperature range, surpasses a times hot-stretch.For holding temperature, can preferably in said path, feed the identical saturated steam of temperature.During stretching, make as-spun fibre, in the path, feed protective gas then, can be inert gas or nitrogen through the path, preferred, select for use nitrogen after the heating as protective gas.Drafting machine can be selected hot-rolling drafting machine or cold roller drafting machine for use, and is preferred, selects the hot-rolling drafting machine for use, and the temperature of hot-rolling is preferably 70~90 ℃, can play the effect of preheating to fiber.Among this paper, when fiber being applied stretching, need carry out at a certain temperature; Therefore the pipe, casing, cylinder of both ends open etc. are arranged between drafting machine; Feeding therein needs the gas of temperature then, and the cylinder that fiber passes is promptly instigated in hot path, path among this paper, but is not limited thereto.
According to the present invention, total draw ratio of said stretching is 10~13 times, more preferably 11~12 times.Finally obtain the superhigh molecular weight polyethylene fibers that fiber number is 360D.Total draw ratio is that the addition again through the ratio of the speed of every adjacent twice drawing-off obtains.Draw ratio is big more, and fiber is thin more, and modulus and intensity are just low more.
Also comprise at last said fiber is wound into tubular through up-coiler, obtain the product of corresponding specification after the packing.
In order to prepare no latitude cloth, said superhigh molecular weight polyethylene fibers is spread on the thin polymer film that is coated with binding agent in advance with excellent properties.Because the effect of binding agent is that fiber is bonded together and can all or part of parcel fiber; And in bullet resistant material, work to absorb and transmit the bullet energy; Therefore should select to have material that excellent mechanical property and fiber have the good combination ability as adhesive; Can select for use polymer matrix material as adhesive; Preferably, select thermoplastic as adhesive, the thermoplastic that can select for use is polyurethane, polyvinyl polymer, polyacrylic, polyolefin or thermoplastic elastomeric block copolymers.Choosing is more arranged, and said binding agent is selected from polystyrene triblock copolymer (SIS, styrene-isoprene-phenylethene), or Tsing-Hua University's polystyrene triblock copolymer (SIBS, polystyrene-ethene-butylene-styrene).Said binding agent can be the solvent-borne type binding agent, and used solvent can be selected from benzene, toluene, chloroform, carbon tetrachloride, hexane, cyclohexane, chlorination cyclohexane, diethyl ether, methyl-isobutyl ether, ethyl acetate, amyl acetate etc.In binder solution, the weight ratio of binding agent and solvent is 10~40: 90~60, and preferred, the mass ratio of binding agent and solvent is 15~35: 85~65, and is preferred, and the mass ratio of binding agent and solvent is 20~30: 80~70.
Because its main shellproof effect is superhigh molecular weight polyethylene fibers in the no latitude cloth; Therefore suitable binding agent consumption in should unloaded no latitude cloth; In no latitude cloth, the content of binding agent can be 10~30wt%, and the content of preferred binding agent is 14~30wt%; Most preferred, the Han Lang of binding agent is 18~20wt%.
According to the present invention, said thin polymer film be preferably can be good with the binding agent adhesion polyolefin film, polyester film, haloflex film.More preferably polyethylene, polypropylene film, most preferably being the said polyethylene polymer film of polyethylene film is that the number-average molecular weight of said low density polyethylene (LDPE) is preferably 8000~12000 by the low density polyethylene (LDPE) preparation.The mode of coated with adhesive is preferably spraying, manual application, the gluing of upper glue roller machinery.Be parallel to each other between the said superhigh molecular weight polyethylene fibers, spread apart in the same way, the carding operation that can assist through carding machine is more evenly distributed said superhigh molecular weight polyethylene fibers, and single degree of orientation is higher, and surface density is higher.
2~4 blocks of thin polymer films that are bonded with superhigh molecular weight polyethylene fibers are stacked; Filament on the said two adjacent polymeric thing films becomes 0 °/90 ° arrangements, and promptly the filament on two thin polymer films becomes vertical relation so just to make that no latitude cloth tool all can be stressed even at horizontal and vertical both direction mutually.
According to the present invention, can also superhigh molecular weight polyethylene fibers be bonded in the two sides of said thin polymer film according to 0 °/90 ° mode, practiced thrift material, reduced thickness.
At last the said thin polymer film that is bonded with superhigh molecular weight polyethylene fibers is applied the pressure of 5~8MPa under 40~60 ℃, the thin polymer film of long 100m need be suppressed 200~300 seconds, obtained not having latitude cloth.This process is in order to make firm being bonded on the said thin polymer film of said superhigh molecular weight polyethylene fibers, if the too high binding agent of temperature can be crossed the arrangement that influences fiber because of flowability, bubbling or pore phenomenon to occur.The compounding machine that said pressing operation can use those skilled in the art to know carries out; Said compounding machine comprises 2 pressure rollers at least; Filament is spread on the said thin polymer film, thin polymer film is guided in the middle of two pressure rollers through guide wheel, the distance of adjustment pressure roller is a pressure; Under the drive of pressure roller that fiber and thin polymer film is compound, a compression moulding.The temperature of said pressure roller remains between 40~60 ℃, to satisfy binding agent fiber is fixed on the thin polymer film.
Below be the specific embodiment of the invention:
Embodiment 1
The preparation superhigh molecular weight polyethylene fibers: after the 230kg7 solvent naphtha is preheating to 112 ℃, again the 40000kg ultra-high molecular weight polyethylene is placed on to stir in the swelling still 101 with No. 7 solvent naphthas and carries out preliminary swelling, tentatively swelling time is 20 minutes.After the preliminary swelling, be that second part of No. 7 solvent naphtha 690kg of 98 ℃ are added to and carry out swelling in the swelling still again and obtain spinning solution with temperature again, swelling time is 30 minutes again, and mixing speed is constant, the environment temperature of swelling still is dropped to 98 ℃ swelling the time again.
Obtain uniform spinning solution again after the swelling, spinning solution is sent into sent into double screw extruder 103 again after being cooled to 25 ℃ in the material storage kettle 102 and push dissolving.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 in double screw extruder, stops is 5 minutes, and the twin-screw rotary speed is 180rpm.Spinning solution twines, extrudes and process transparent frozen glue solution through separating of twin-screw.
With frozen glue solution through measuring pump 104, have spinneret 105 (the orifice diameter 0.8mm in 400 holes; Draw ratio L/D is 10/1) extrude with the spray silk speed of 1m/min that to get into temperature be that 25 ℃ the tank 106 that solidifies makes the strand typing, the jet stretch of adopting 107 pairs of gel fibers of jet stretch machine to apply 1.5 times then obtains gel fiber.Gel fiber is put into and is left standstill bucket and 110 left standstill 18 hours.
Referring to Fig. 2; Adopt No. 120 solvent naphthas to carry out five grades extraction the gel fiber after leaving standstill; So-called five grades extraction is to make fiber successively from low to high through first extraction box 201, second extraction box 202, the 3rd extraction box 203, the 4th extraction box 204, the 5th extraction box 205; Wherein the solvent naphtha in the 5th extraction box flows through the 4th extraction box, the 3rd extraction box, second extraction box, first extraction box from high to low successively, and giving of solvent naphtha and gel fiber is in the opposite direction.
Gel fiber is through dry through 55 ℃, 60 ℃, 65 ℃ two-stage successively again after extracting.
Referring to Fig. 3; Dried gel fiber is fed the hot path in the hot path in the hot path of first drafting machine 301, first 302, second drafting machine 303, second 304, the 3rd drafting machine the 305, the 3rd 306, the 4th drafting machine 307 successively, adopt then and receive silk device 308 and receive silk.Wherein, the temperature in the first hot path is that 90 ℃, the temperature in the second hot path are 110 ℃, and the temperature in the 3rd hot path is 125 ℃; First drafting machine, second drafting machine, the 3rd drafting machine, the 4th drafting machine all are five roller drafting machines, in order to reach the object of the invention, do not have concrete restriction for leading refreshing machine the present invention, as long as can satisfy drafting multiple; The roller temperature of first drafting machine is 90 ℃, and the roller temperature of second drafting machine is 110 ℃, and the roller temperature of the 3rd drafting machine is 125 ℃, and the roller temperature of the 4th drafting machine is 15 ℃.Second drafting machine doubly is 1.8 times to leading of applying of as-spun fibre, and the 3rd drafting machine doubly is 2.8 times, the 4th drafting machine to leading of applying of as-spun fibre to leading of applying of as-spun fibre doubly is 3.4 times.Total draw ratio is 10 times.
After gel fiber surpasses times hot-stretch through five roads, adopt the receipts silk device to receive silk and obtain superhigh molecular weight polyethylene fibers.
Embodiment 2
Use the superhigh molecular weight polyethylene fibers of embodiment 1 preparation, said fiber is sprawled being coated with on the low density polyethylene film of polystyrene triblock copolymer.With 2 blocks of said thin polymer films that are bonded with fiber under the effect of guide wheel through two pressure rollers that rotate, the temperature of pressure roller is 60 ℃, the 8MPa that exerts pressure, obtaining fabric width is the no latitude cloth of 1.6m.Because what use is the filament of 360D, so the surface density of said no latitude cloth is 135g/cm
2
Getting 30 layers of above-mentioned bilayer does not have latitude cloth mutual superposition, and the pressure that no latitude cloth lamination is applied 0.4MPa overflows the air between the lamination, is placed on temperature then and is typing in 125 ℃ the hot pressing die; Typing pressure is 25MPa; Constant temperature pressurize 15 minutes obtains armour, adopts America NI J0101.04 side monomer testing standard that this armour is carried out the ballistic performance test; The result shows it can resist 9.6g, and speed is 847m/ 7.62 millimeters bore all-metals coating bullets of second.
Embodiment 3
Use the superhigh molecular weight polyethylene fibers of embodiment 1 preparation, said fiber is sprawled being coated with on the low-density polyethylene film of binding agent.With 2 blocks of said thin polymer films that are bonded with fiber under the effect of guide wheel through two pressure rollers that rotate, the 5MPa that exerts pressure obtains fabric width and is the no latitude cloth of 1.2m because what use is the filament of 360D, so the surface density of said no latitude cloth is 135g/cm
2
Getting 100 layers of above-mentioned bilayer does not have latitude cloth mutual superposition, and the pressure that no latitude cloth lamination is applied 5MPa overflows the air between the lamination, is placed on temperature then and is typing in 125 ℃ the hot pressing die; Typing pressure is 20MPa; Constant temperature pressurize 15 minutes obtains armour, adopts America NI J0101.04 side monomer testing standard that this armour is carried out the ballistic performance test; The result shows it can resist 10.8g, and speed is that 7.62 millimeters bore all-metals of 869 meter per seconds coat bullet.
More than a kind of ultra-high molecular weight polyethylene provided by the invention is not had latitude cloth the preparation method carried out detailed introduction; Having used concrete example among this paper sets forth principle of the present invention and embodiment; The explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; 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 carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.