1. A preparation method of a high-performance ultrahigh molecular weight polyethylene strip is characterized by comprising the following steps:

s1: unwinding the raw material fiber, and then spreading the raw material fiber in the same direction to form a fiber bundle with a certain width;

s2: pretreating the fiber bundle obtained in the step S1;

s3: applying pretension to the fiber bundle pretreated in the step S2, feeding a rotating counter-pressure roller or a flat plate, and performing surface bonding under pressure;

s4: and (5) solidifying, trimming, winding and forming the material belt with the surface bonded in the S3 to obtain the high-performance ultrahigh molecular weight polyethylene belt.

2. The method as claimed in claim 1, wherein the raw material fiber in S1 is ultra-high molecular weight polyethylene monofilament or multifilament or a mixture of both;

the denier of the raw material fiber in S1 is 0.1D-5000D, and the mechanical strength is 10-60 cN/dtex.

3. The method for preparing a high-performance ultra-high molecular weight polyethylene strip according to claim 1, wherein the tiled in the same direction in S1 has a width of 0-15 m and a thickness of 0.1-1 mm.

4. The method as claimed in claim 1, wherein the pretreatment in S2 is one or more selected from static electricity removal, preheating, liquid wetting, gas purging, etc.

5. The method as claimed in claim 1, wherein the surface bonding manner in S3 is one or more of melting at high temperature, swelling, dissolving and cross-linking, so that the molecular chains on the surface of the fiber move and entangle with each other.

6. The method for preparing the high-performance ultra-high molecular weight polyethylene strip according to claim 5, wherein the high-temperature melting temperature in S3 is 130-200 ℃, the bonding time is more than or equal to 0.1 second, and the bonding pressure is more than or equal to 10N.

7. The method for preparing high-performance ultra-high molecular weight polyethylene strip according to claim 1, wherein in step S3, the counter-pressure roller comprises two cylindrical rollers rotating reversely and having smooth surfaces, the counter-pressure roller is matched with the roller gap adjusting module, the roller is also matched with the roller surface temperature adjusting module, and the roller gap adjusting module and the roller surface temperature adjusting module are both electrically connected with an external control terminal.

8. The method as claimed in claim 1, wherein the solidifying process in S4 is one or more of cooling, desolventizing, and radiation solidifying.

9. The method for preparing high performance ultra high molecular weight polyethylene tape according to claim 1, wherein the solidification temperature in S4 is less than or equal to 130 ℃, and the cooling solidification time is greater than or equal to 0.1 second.

10. A high performance ultra high molecular weight polyethylene tape produced by the process of any one of claims 1 to 9.

Background

The UHMWPE fiber is the fiber material with the highest specific strength in the current industrialized fiber materials and is one of three high-performance fibers in the world. Owing to the ultrahigh molecular weight and narrow molecular weight distribution of UHMWPE, the UHMWPE fiber material has excellent mechanical property, wear resistance and chemical corrosion resistance, and has the characteristics of light weight, high heat conductivity coefficient and the like, so that the UHMWPE fiber material has wide application in the fields of national defense and military, aerospace, ocean engineering and civil protection.

In the prior preparation method, the UD material adopts the traditional process technology, 800D/1200D/1600D coarse denier fiber is firstly prepared, then the fiber is spread in warp and weft, and non-woven cloth (UD) or wide fiber is prepared by gluing and the like. The prepared wide fibers are bonded by glue completely. However, the composite weftless fabric prepared by the technology has the defects of poor heat resistance, poor comprehensive mechanical strength and serious creep deformation due to the defects of the adhesive used as the matrix, and the UHMWPE fiber composite weftless fabric prepared by the technology cannot effectively passivate the impact force of bullets, can only achieve the bulletproof effect by increasing the number of layers of the weftless fabric, but can cause the increase of the load of common soldiers and policemen in use. Therefore, how to change the heat resistance of the UHMWPE fiber composite weftless fabric to enable the UHMWPE fiber composite weftless fabric to have higher impact resistance and effectively 'passivate' the impact force of bullets becomes a necessary trend for the research of bulletproof protectors.

In the UD preparation process, high-performance wide-width belt materials are used for replacing fibers, so that the strength of the UD in the MD direction is kept, the absorption effect of a single-layer UD protective material on transverse impact is greatly improved, the filament dividing and laying process is simplified, and the effect of improving the process stability is achieved.

US4916000 discloses a process for preparing a unidirectional prepreg tape of high strength and high modulus polyethylene fibers in which a fiber bundle is spread by two spreading rolls, then a suitable adhesive is sprayed on the spread fibers, and dried to obtain the unidirectional prepreg tape.

Chinese patent CN1291090C discloses a continuous preparation method of a high-strength high-modulus polyethylene fiber unidirectional prepreg tape, in which high-voltage static electricity is applied to a fiber tape to uniformly spread the fibers, an adhesive is sprayed on the spread fibers, and the adhesive is dried to obtain the unidirectional prepreg tape.

Chinese patent 201710458351.0 discloses a non-woven fabric and its manufacturing method and application, the invention unwinds, bunches, divides silk, spreads silk, rubberizes the high-strength fiber, then compounds the polyethylene film on at least one side of the rubberized high-strength fiber, after drying, orthogonally compounds more than two layers of single orientation sheets with films together to obtain the non-woven fabric, the invention uses the gluing mode to prepare the polyethylene non-woven fabric, the fibers are easy to peel.

The single-layer strips are only oriented in the axial direction, and the strength is provided by the glue in the radial direction, so that the stress capability is weak, and the single-layer strips cannot play a good bulletproof protection role.

Chinese patent CN106480600A discloses a method for manufacturing UHMWPE sheets, in which fibers are arranged by unwinding, bundling, arranging, spreading, sizing, drying and other processes to make UHMWPE sheets (UD fabrics), which solves the problem of arranging ordinary tows, only improves the arrangement uniformity, and does not mention the problem of bonding between fibers.

Chinese patent CN110079872A discloses a preparation method of wide-width high-strength high-modulus polyethylene fiber, which extrudes spinning solution from a single-row of multiple holes, and prepares the wide-width fiber by fusing and combining the spinning solution through a spinneret. Although the fiber belt prepared by the method can provide certain stress in the radial direction, the actual mechanical strength is lost to a certain extent due to insufficient axial orientation in the extrusion process.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a high-performance ultrahigh molecular weight polyethylene strip and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

the first purpose of the technical scheme is to protect a preparation method of a high-performance ultrahigh molecular weight polyethylene strip, which comprises the following steps:

s1: unwinding the raw material fiber, and then spreading the raw material fiber in the same direction to form a fiber bundle with a certain width;

s2: pretreating the fiber bundle obtained in the step S1;

s3: applying pretension to the fiber bundle pretreated in the step S2, feeding a rotating counter-pressure roller or a flat plate, and performing surface bonding under pressure;

s4: and (5) solidifying, trimming, winding and forming the material belt with the surface bonded in the S3 to obtain the high-performance ultrahigh molecular weight polyethylene belt.

The preparation process of the technical scheme can be continuously carried out or carried out in batch by batch.

Further, the raw material fiber in S1 is ultra-high molecular weight polyethylene monofilament or multifilament or a mixture of the two;

the denier of the raw material fiber in S1 is 0.1D-5000D, and the mechanical strength is 10-60 cN/dtex.

More preferably, the fiber raw material has a filament denier of 1-2D and a mechanical strength of 30-40 cN/dtex.

Further, the width of the tile laid in the same direction in S1 is 0-15 m, and the thickness is 0.1-1 mm.

Further, the pretreatment in S2 is one or more of static elimination, preheating, liquid immersion, gas purging, and the like.

Further, the fiber pretension in S3 is 0% to 90%, preferably 5% to 75%, of the maximum tension that the fiber can bear.

Further, the surface bonding manner in S3 is one or a combination of melting at high temperature, swelling, dissolving, and crosslinking, so that the molecular chains on the surface of the fiber move, and the surface molecular chains are entangled with each other. In order to avoid uneven distribution, uneven thickness and the like caused by the charge effect after the fibers are spread, the fibers can be subjected to physical or chemical static electricity removal pretreatment; the preheating treatment of the fibers can greatly reduce the process time of the subsequent bonding working section; the liquid wetting on the fiber surface can be solvent or non-solvent, on one hand, the fiber can be prevented from being bonded on the surface of equipment after being melted, and on the other hand, the effect of partial swelling and dissolving of the surface can be achieved.

Further, in S3, the high-temperature melting temperature is 130-200 ℃, the bonding time is more than or equal to 0.1 second, and the bonding pressure is more than or equal to 10N.

Further preferably, the high-temperature melting temperature is 180-220 ℃, and the bonding time is 0.5-3 seconds.

Further preferably, the pressure applied during surface bonding is 5 to 10 KN.

Further, in S3, the counter-pressure roller comprises two reversely-rotating cylindrical rollers with smooth surfaces, the counter-pressure roller is matched with an inter-roller gap adjusting module, the roller is also matched with a roller surface temperature adjusting module, and the inter-roller gap adjusting module and the roller surface temperature adjusting module are electrically connected with a peripheral control terminal.

Furthermore, the gap adjusting module comprises an adjusting electric cylinder or an adjusting screw rod, driving force is provided through the adjusting electric cylinder or the adjusting screw rod, adjustment of the gap of the roller is achieved, motors providing the driving force in the adjusting process are all servo motors, and the servo motors are electrically connected with a computer of the control terminal, so that servo control is achieved.

Furthermore, the temperature adjusting module is a power adjuster, is connected with the electric heater inside the roller and is electrically connected with a computer of the control terminal, so as to realize the regulation and control of the heating temperature.

Further, the curing process in S4 is one or more of cooling, desolvation, radiation curing, and the like.

Further, the cooling solidification can adopt contact cooling or gas purging cooling.

Further, in S4, the solidification temperature is 130 ℃ or lower, and the cooling solidification time is 0.1 seconds or longer.

Further preferably, the cooling solidification temperature is 7-30 ℃, and the cooling solidification time is 0.5-3 seconds.

A second object of the present solution is to protect a high performance ultra high molecular weight polyethylene tape produced by the above method.

Compared with the prior art, the invention has the following technical advantages:

1) according to the technical scheme, the UHMWPE fiber bundles with certain mechanical strength are spread flat and applied with certain external tension, surface molecular chains of the UHMWPE fiber bundles move through the processes of heating, melting, solvent dissolving and the like, and are intertwined with one another and then shaped to finally form the UHMWPE strip with certain width and thickness, so that the original mechanical strength of the fibers is retained to the greatest extent, and the transverse stripping strength is improved.

2) The width and the thickness of the belt material prepared by the technical scheme can be adjusted and controlled, the breaking strength is high, the modulus is high, the post-processing treatment is convenient, the belt material can be used for preparing products such as bulletproof clothes, armguards, summer sleeping mats, cut-proof socks and cut-proof gloves, and compared with the traditional polyethylene fiber and belt production method and the product post-processing technology, the technical scheme has the characteristics of short preparation process, simple and easy operation process, convenient post-processing and the like.

Drawings

FIG. 1 is a schematic flow chart of the preparation method in the technical scheme;

in the figure: 1-fiber bundle; 2-a pressure regulation module; 3-upper counter pressure roller; 4-pressing the rollers; 5-curing and shaping equipment; 6-polyethylene tape; 7-traction and winding equipment; 8-filament paving equipment.

Detailed Description

According to the invention, through technological innovation, the finally prepared high-performance ultra-high molecular weight polyethylene strip is directly processed and prepared by using finished high-performance polyethylene fibers, and the original mechanical strength of the fibers is retained to the maximum extent, so that the performance of the polyethylene strip is superior to that of the polyethylene strip directly prepared by extrusion and the strip formed by gluing.

The technical scheme is simple in preparation process, the strip can be directly provided with a wide width according to the UD required specification, the strip can be directly pressed by a machine tool in the UD manufacturing process, complex processes such as dividing and laying are simplified, the prepared UD cloth cover is more uniform in density and better in performance.

The invention is described in detail below with reference to the figures and specific embodiments.

Example 1:

the preparation process of the technical scheme can be continuously carried out or carried out in batch and batch, and is shown in figure 1, wherein:

s1 unwinding the raw material fiber and then spreading the raw material fiber in the same direction by using a fiber spreading device 8 to form a fiber bundle 1 with a certain width;

s2: pretreating the fiber bundle 1 obtained in the step S1;

s3: applying pretension to the fiber bundle 1 pretreated in the step S2, feeding a rotating counter pressure roller or a flat plate, adaptively adjusting the gap between an upper pressure roller 3 and a lower counter pressure roller 4 by a pressure adjusting module 2 according to an instruction, and carrying out surface bonding under pressure;

s4: and (3) solidifying the polyethylene belt 6 with the surface bonded in the S3 by using a solidifying and shaping device 5, cutting edges, and winding and shaping by using a traction and winding device 7 to obtain the high-performance ultrahigh molecular weight polyethylene belt.

Wherein UHMWPE with specification of 400D and strength of 42cN/dtex is used as protofilament, 20 bundles of fibers are flatly laid, the fibers are preheated to 50 ℃ before feeding, the fiber pretension is 30% of the maximum tension which can be borne by the fibers, and then the fibers are fed into a counter-pressure roller at the speed of 10m/min (bonding time of 2 seconds). The processing temperature was set at 150 ℃ and the processing pressure was set at 1kN, followed by cooling and solidification at 7 ℃ for 3 seconds to obtain a fiber tape having a width of 0.14 m. The MD strength was 38cN/dtex, and the TD peel force was 50N.

Example 2:

in contrast to example 1, UHMWPE of specification 200D and strength 32cN/dtex was used as precursor, 50 bundles of fibres were laid flat, the fibres were preheated to 50 ℃ before feeding, the fibre pretension was 75% of the maximum tension that the fibres can withstand, and the counter-pressure roll was then fed at a speed of 25m/min (5 seconds bonding time). The processing temperature was set at 150 ℃ and the processing pressure was set at 1kN, followed by cooling and solidification at 7 ℃ for 3 seconds to obtain a fiber tape having a width of 0.15 m. The MD strength was 30cN/dtex, and the TD peel strength was 30N.

Example 3:

in contrast to example 1, UHMWPE of size 1600D and strength 38cN/dtex was used as precursor, 20 bundles of fibres were laid flat, the fibres were preheated to 75 ℃ before feeding, the fibre pretension was 30% of the maximum tension that the fibres can withstand, and the counter-pressure roll was then fed at a speed of 10m/min (2 seconds bonding time). The working temperature was set at 150 ℃ and the working pressure was set at 1.2kN, followed by cooling and solidification at 7 ℃ for 3 seconds to obtain a fiber tape having a width of 0.77 m. The MD strength was 36cN/dtex, and the TD peel strength was 60N.

Example 4:

in contrast to example 1, 200 bundles of fibers were laid flat using 800D gauge UHMWPE with a strength of 30cN/dtex as the precursor, the fibers were preheated to 90 ℃ before feeding, the fiber pre-tension was 20% of the maximum tension that the fibers can withstand, and then the counter roll was fed at a speed of 20m/min (4 seconds bonding time). The working temperature was set at 175 ℃ and the working pressure at 1.5kN, followed by cooling and solidification at 7 ℃ for 2 seconds to obtain a fiber tape having a width of 3.1 m. The MD strength was 20cN/dtex, and the TD peel strength was 100N.

Example 5:

in contrast to example 1, UHMWPE of specification 800D and strength 40cN/dtex was used as precursor, 100 bundles of fibres were laid flat, the fibres were preheated to 110 ℃ before feeding, the fibre pretension was 5% of the maximum tension that the fibres can withstand, and the counter-pressure roll was then fed at a speed of 20m/min (4 seconds bonding time). The working temperature was set at 210 ℃ and the working pressure was set at 1.5kN, followed by cooling and solidification at 7 ℃ for 10 seconds to obtain a fiber tape having a width of 1.85 m. The MD strength was 25cN/dtex, and the TD peel strength was 150N.

Example 6:

in contrast to example 1, UHMWPE of specification 400D and strength 42cN/dtex was used as precursor, 20 bundles of fibers were laid flat with a fiber pre-tension of 30% of the maximum tension that the fibers can withstand, and the fiber surface was sprayed with pre-decalin before feeding and then fed to a counter-pressure roll at a speed of 4m/min (bonding time 8 seconds). Setting the processing temperature at 210 ℃ and the processing pressure at 1kN, cooling and solidifying for 3 seconds at 7 ℃, and blowing for 60 seconds at 60 ℃ under hot nitrogen to obtain the fiber strip with the width of 0.09 m. The MD strength was 35cN/dtex, and the TD peel strength was 220N.

Example 7:

in contrast to example 1, UHMWPE of specification 400D and strength 42cN/dtex was used as precursor, 20 bundles of fibers were laid flat with a fiber pre-tension of 30% of the maximum tension that the fibers can withstand, and the fiber surface was sprayed with pre-decalin before feeding and then fed to a counter-pressure roll at a speed of 2m/min (bonding time 16 seconds). The processing temperature is set to 190 ℃ and the processing pressure is set to 1kN, then the cooling and solidification are carried out for 3 seconds at 7 ℃, and the blowing is carried out for 45 seconds under the hot nitrogen at 80 ℃ to obtain the fiber strip with the width of 0.11 m. The MD strength was 31cN/dtex, and the TD peel strength was 350N.

Example 8:

in contrast to example 1, UHMWPE of specification 400D and strength 42cN/dtex was used as precursor, 20 bundles of fibers were laid flat, and the fiber surface was sprayed with pre-decalin before feeding, and then fed to a counter-pressure roll at a speed of 4m/min (bonding time 8 seconds). The processing temperature is set to 210 ℃ and the processing pressure is set to 1kN, then the cooling and solidification are carried out for 3 seconds at the temperature of 7 ℃, and the blowing is carried out for 30 seconds under the hot nitrogen at the temperature of 60 ℃ to obtain the fiber strip with the width of 0.10 m. The MD strength was 37cN/dtex, and the TD peel strength was 220N.

Example 9:

in contrast to example 1, UHMWPE of specification 400D and strength 42cN/dtex was used as precursor fibers, 20 bundles of fibers were laid flat, the fiber surface was pre-impregnated with 50% polyurethane glue before feeding, the fibers were preheated to 85 ℃, and then fed to a counter-pressure roll at a speed of 15m/min (bonding time 3 seconds). Setting the processing temperature at 135 ℃ and the processing pressure at 2kN, and blowing and curing in air at 60 ℃ to obtain the fiber strip with the width of 0.15 m. The MD strength was 40cN/dtex, and the TD peel strength was 60N.

Comparative example 1:

in contrast to example 1, UHMWPE of specification 400D and strength 42cN/dtex was used as precursor, 20 bundles of fibres were laid flat, the fibres were left untreated before feeding and then fed to a counter-pressure roll at a speed of 10m/min (bonding time 2 seconds). The processing temperature was set at 150 ℃ and the processing pressure was set at 1kN, followed by cooling and solidification at 7 ℃ for 3 seconds to obtain a fiber tape having a width of 0.15 m. The MD strength was 39cN/dtex, and the TD peel strength was 15N.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.