CN114351307A - Non-isodiametric UHMWPE fiber mixed yarn for protective product, preparation method thereof and protective product - Google Patents
Non-isodiametric UHMWPE fiber mixed yarn for protective product, preparation method thereof and protective product Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
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- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000004744 fabric Substances 0.000 abstract description 16
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- 238000009987 spinning Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 8
- 238000010036 direct spinning Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000009960 carding Methods 0.000 description 6
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Abstract
The invention provides a non-isodiametric UHMWPE fiber mixed yarn for a protective product, a preparation method thereof and the protective product, wherein the mixed yarn at least comprises a first UHMWPE fiber and a second UHMWPE fiber with two different diameters, and the first UHMWPE fiber and the second UHMWPE fiber are filaments or staple fibers together; the first UHMWPE fibers have a smaller diameter than the second UHMWPE fibers, the diameter of the first UHMWPE fibers being larger than the largest diameter of the fibers that can be accommodated by the voids formed when the second UHMWPE fibers are packed, and not more than 0.8 times the diameter of the second UHMWPE fibers. The present invention, through the common combination of UHMWPE filaments or staple fibers of different monofilament diameters, improves the cut resistance of the yarn, and also provides improved abrasion resistance and flexibility, suitable for making cut, abrasion and penetration resistant fabrics with excellent comfort characteristics.
Description
Technical Field
The invention belongs to the technical field of cut-resistant materials, and particularly relates to a non-isodiametric UHMWPE fiber mixed yarn for a protective product, a preparation method thereof and the protective product.
Background
Cut resistant yarns are used primarily to make cut, penetration and puncture resistant fabrics; such fabrics may be used to make protective garments for the following groups: workers in various industries that are exposed to abrasive or sharp objects in operation, and police and military personnel that need to protect against penetrating implements and projectiles.
Conventionally, cut resistant yarns may be composed of one or more components of synthetic fibers, glass fibers, and various mineral fibers, metal fibers, and the like. Synthetic fibers used in cut resistant yarns are mainly high strength, high modulus chemical fibers such as ultra high molecular weight polyethylene fibers (UHMWPE fibers for short), aramid fibers, and the like. Among them, UHMWPE fibers are usually produced by spinning, extracting, drying and super-drawing polyethylene having a relative molecular weight of more than 100 ten thousand in sequence. For many fiber components, cut resistant yarns are typically made by spinning, coating, etc.
Cut resistant yarns are typically knitted to produce protective fabric products with cut resistance, such as: knitted cut-resistant gloves, and the like. Currently, the cut resistance of existing UHMWPE cut resistant yarns remains to be further improved.
Disclosure of Invention
In view of the above, the present application aims to provide a non-isodiametric UHMWPE fiber hybrid yarn for protective products, a preparation method thereof, and a protective product.
The invention provides a non-isodiametric UHMWPE fiber mixed yarn for a protective product, which at least consists of a first UHMWPE fiber and a second UHMWPE fiber with two different diameters, wherein the first UHMWPE fiber and the second UHMWPE fiber are filaments or staple fibers together; the first UHMWPE fibers have a smaller diameter than the second UHMWPE fibers, the diameter of the first UHMWPE fibers being larger than the largest diameter of the fibers that can be accommodated by the voids formed when the second UHMWPE fibers are packed, and not more than 0.8 times the diameter of the second UHMWPE fibers.
The non-isodiametric UHMWPE fiber mixed yarn is formed by blending UHMWPE filaments or staple fibers with different monofilament diameters together, and simultaneously contains UHMWPE mixed yarns (threads) of monofilaments with different diameters, the yarns are composed of two or more UHMWPE filaments or staple fibers with different monofilament diameters, the fiber with the smaller diameter is recorded as a first UHMWPE fiber, the diameter of the fiber is larger than the maximum diameter of the fiber which can be accommodated by a gap formed when the fibers with the larger diameter (recorded as a second UHMWPE fiber) are stacked, and the diameter of the fiber is not more than 0.8 times of the diameter of the fiber with the larger diameter. The stacking is simple cubic stacking and close stacking; when cut by external force, the fibers with different diameters are easier to move and quickly reach a relatively compact packing state. When the UHMWPE filament or short fiber mixed yarn with different monofilament diameters is cut by external force, fibers with different diameters are easier to move relative to each other, partial attack force can be dissipated, the yarn quickly reaches a relatively compact stacking state to provide more materials to resist the attack force, and the yarn shows more excellent cutting resistance and wearing comfort compared with the yarn only containing single titer.
Fineness represents the degree of thickness of natural silk or chemical fiber; denier (D) -, also known as "denier" or (denier), refers to the weight in grams of 9000 meters of a yarn or fiber at a given moisture regain. For example, a 9000 meter long fiber weighs one gram and is referred to as 1D. The finer the fiber, the smaller the fineness. The UHMWPE fiber filaments are cylindrical in shape, so their thickness can be expressed in terms of diameter, the diameter of an individual UHMWPE fiber being the filament diameter.
UHMWPE fibers are typically produced from polyethylene having a relative molecular weight of more than 100 ten thousand by spinning, extraction, drying and ultradrawing in that order. In the present application, the UHMWPE fibers may be either filaments or staple fibers; filaments are continuous fibers directly obtained from spinning, and staple fibers are generally short staple fibers made by cutting filaments into shorter lengths. The first UHMWPE fibers and the second UHMWPE fibers are together filaments or both staple fibers.
In an embodiment of the invention, the diameter of the smaller diameter fibers in the hybrid yarn is greater than 0.52 times the diameter of the larger diameter fibers and no more than 0.75 times the diameter of the larger diameter fibers. The fiber diameter of the UHMWPE filaments or staple fibers (including the first UHMWPE fibers, the second UHMWPE fibers) in the hybrid yarn is between 5 and 50 μm, preferably between 10 and 30 μm; the diameter of the second UHMWPE fibers is above 20 μm, preferably above 35 μm, more preferably above 45 μm, e.g. the diameter is 21-25 μm, or 46-50 μm, etc.
In some embodiments of the present application, the hybrid yarn is composed of UHMWPE fibers of two different diameters, the larger diameter fibers may have a diameter of 23 μm and the smaller diameter fibers have a diameter between 15 and 17 μm. In other embodiments, the hybrid yarn consists of UHMWPE fibers of three different diameters, which in turn may be 13 μm, 16 μm, 23 μm.
In the mixed yarn in the embodiment of the invention, the strength of UHMWPE filaments or staple fibers with different diameters is more than 30cN/dtex, preferably more than 35 cN/dtex; the modulus is 1000cN/dtex or more, preferably 1200cN/dtex or more.
Further, the UHMWPE filaments or staple fibers of larger diameter in the hybrid yarn contain hard microfibers having a mohs hardness of more than 3.5, such as glass fibers, carbon fibers, basalt fibers, silicon carbide fibers, boron nitride fibers, graphene fibers, and the like.
In order to obtain the UHMWPE hybrid yarn, the yarn preparation method adopted in the embodiment of the present invention specifically includes the following three methods:
(1) the UHMWPE short fiber mixed yarn simultaneously containing two or more than two monofilaments with different diameters is obtained by fully and uniformly mixing two or more than two UHMWPE short fibers with different monofilament diameters in proportion, then carding by a carding machine to enable the short fiber mixture to form long strips, and then carrying out the working procedures of combing, drawing, roving, spinning and the like.
(2) Two or more UHMWPE filaments with different monofilament diameters are proportionally doubled and mixed in the form of fiber bundles or continuous filaments to obtain the UHMWPE filament mixed yarn simultaneously containing two or more monofilaments with different diameters.
(3) A mixed yarn of UHMWPE filaments comprising two or more filaments of different diameters simultaneously is prepared by direct spinning using a specially prepared spinneret having two or more spinneret holes of different diameters.
In the preparation method (1), two or more than two UHMWPE short fibers with different monofilament diameters are fully and uniformly mixed in proportion, then a carding machine is used for enabling the short fiber mixture to form long strips, and the mixed yarn is obtained through the working procedures of combing, drawing, roving, spinning, post-processing and the like. The specific operation is as follows: firstly, taking out UHMWPE staple fibers with different monofilament diameters according to a selected proportion, uniformly mixing, preliminarily opening, removing impurities and mixing by using an opening machine, carding a staple fiber mixture into a single fiber state by using a carding machine with the surfaces of needle teeth, bundling into strips and conveying into continuous strands of loose combined fibers, commonly known as raw strips, drafting and combining the raw strips into small rolls, then feeding the small rolls into a combing machine, respectively combing two ends of the fibers by using different needle rows, removing the staple fibers and impurities to prepare combed strips, feeding the combed strips into a drawing frame in parallel, drawing into cotton strips, commonly known as drawn strips, then preparing the drawn strips into staple fibers by using a common spinning technology, and performing post-treatment to obtain the mixed yarn.
The strength of the UHMWPE staple fibers in the mixed yarn is preferably more than 30cN/dtex, preferably more than 35 cN/dtex; the modulus is more than 1000cN/dtex, preferably more than 1200 cN/dtex; elongation at break of 1.5-6%, preferably 2-4%; the length of the short fiber is 20-200mm, preferably 35-60 mm; the fiber diameter is 5 to 50 μm, preferably 10 to 30 μm. The diameter of the smaller diameter fibers in the different monofilament diameter UHMWPE staple fibers is greater than the maximum diameter of the fibers that can be accommodated by the voids formed when the larger diameter fibers are packed (both in simple cubic packing and close packing) and is no more than 0.8 times the diameter of the larger diameter fibers. Preferably, the diameter of the smaller diameter fibers in the hybrid yarn is greater than 0.65 times the diameter of the larger diameter fibers and no more than 0.75 times the diameter of the larger diameter fibers.
In a preferred embodiment, the hybrid yarn is composed of UHMWPE staple fibers of two different monofilament diameters, 20-60% (by number) of the yarn being composed of UHMWPE staple fibers of higher monofilament diameter and 40-80% (by number) of the yarn being composed of UHMWPE staple fibers of lower monofilament diameter. More preferably, 45-55% (by number) of the filaments in the yarn are comprised of staple having a higher filament diameter and 45-55% (by number) of the filaments in the yarn are comprised of staple having a lower filament diameter. The number is counted, for example, in 400D/158F filaments, the larger monofilament diameter is 66F, and the smaller monofilament diameter is 82F; the short fibers are also counted in the ratio of the number of short fibers having different diameters.
In another preferred embodiment, the hybrid yarn is composed of UHMWPE staple fibers of three different monofilament diameters, 15-35% (by number) of the yarn being composed of UHMWPE staple fibers of the largest monofilament diameter, 30-45% (by number) of the yarn being composed of UHMWPE staple fibers of a medium monofilament diameter, and 30-45% (by number) of the yarn being composed of UHMWPE staple fibers of the smallest monofilament diameter. Wherein the UHMWPE staple fiber with the smallest monofilament diameter is not more than 0.8 times the UHMWPE staple fiber with the medium monofilament diameter.
The UHMWPE filaments or staple fibers with larger diameters in the mixed yarn can contain hard microfibers with Mohs hardness larger than 3.5, such as glass fibers, carbon fibers, basalt fibers, silicon carbide fibers, boron nitride fibers, graphene fibers and the like. Specifically, the hard microfiber filler with Mohs hardness of more than 3.5 can be added through gel spinning, and the gel spinning method is an industry known method.
In the preparation (2) of the embodiment of the present invention, two or more UHMWPE filaments with single filament number are selected, and then the UHMWPE filaments are proportionally combined and mixed in the form of fiber bundles or continuous filaments to obtain the mixed yarn.
The strength of UHMWPE filaments in the mixed yarn is preferably more than 30cN/dtex, preferably more than 35 cN/dtex; the modulus is more than 1000cN/dtex, preferably more than 1200 cN/dtex; elongation at break of 1.5-6%, preferably 2-4%; the fiber diameter is 5 to 50 μm, preferably 10 to 30 μm. The diameter of the smaller diameter fibers of said different monofilament diameter UHMWPE filaments is greater than the maximum diameter of the fibers that can be accommodated by the voids formed when the larger diameter fibers are packed (both as simple cubic packs and as close packs) and is no more than 0.8 times the diameter of the larger diameter fibers. Preferably, the diameter of the smaller diameter fibers in the hybrid yarn is greater than 0.65 times the diameter of the larger diameter fibers and no more than 0.75 times the diameter of the larger diameter fibers.
In a preferred embodiment, the hybrid yarn is composed of UHMWPE filaments of two different monofilament diameters, 20-60% (by number) of the yarn being composed of UHMWPE filaments of the higher monofilament diameter and 40-80% (by number) of the yarn being composed of UHMWPE filaments of the lower monofilament diameter. More preferably, 45-55% (by number) of the filaments in the yarn are comprised of higher monofilament diameter UHMWPE filaments, and 45-55% (by number) of the filaments in the yarn are comprised of lower monofilament diameter UHMWPE filaments.
In another preferred embodiment, the hybrid yarn is composed of UHMWPE filaments of three different monofilament diameters, 15-35% (by number) of the yarn being composed of UHMWPE filaments of the largest monofilament diameter, 30-45% (by number) of the yarn being composed of UHMWPE filaments of the medium monofilament diameter, and 30-45% (by number) of the yarn being composed of UHMWPE filaments of the smallest monofilament diameter.
The UHMWPE filament or staple fiber with larger diameter in the mixed yarn contains hard microfiber with Mohs hardness more than 3.5, such as glass fiber, carbon fiber, basalt fiber, silicon carbide fiber, boron nitride fiber, graphene fiber and the like.
Although UHMWPE hybrid yarns of different filament diameters may be produced by off-line combination of UHMWPE filaments or staple fibers of different filament diameters as in the above preparations (1) and (2), i.e. after spinning, it is preferred to produce continuous filament hybrid yarns of different filament diameters by direct spinning using tailored spinnerets with orifices of different pore sizes, wherein the UHMWPE filaments in the yarn have two or more different filament titers. That is, off-line combination is less preferred than direct spinning. The direct spinning process does not need to proportionally ply the fibers with different monofilament diameters in the later period, and the method is simple, convenient and efficient.
In addition, the UHMWPE continuous filament blend yarn spun by a specially made spinneret (having two or more different filament diameters) may also be cut into staple fibers for spinning the staple fiber blend yarn in the above preparation (1).
Example of the invention the preparation (3) above is to prepare a mixed yarn with non-equal diameter UHMWPE filaments by direct spinning using a tailored spinneret with two or more different bore diameters. Wherein the UHMWPE filaments in the yarn have two or more different monofilament diameters. The spinning as described herein may be gel spinning, or gel spinning. Gel spinning is a well-known spinning method in the industry, UHMWPE raw material and white oil are mixed according to a certain proportion, dissolved and extruded by a double-screw extruder for spinning, and UHMWPE fiber is obtained through extraction, drying and high-power hot drawing; the process conditions such as drawing are not particularly limited in the present application.
In the embodiment of the invention, the breaking strength of the UHMWPE filament mixed yarn is more than 30cN/dtex, preferably more than 35 cN/dtex; the modulus is more than 1000cN/dtex, preferably more than 1200 cN/dtex; the elongation at break is 1.5 to 6%, preferably 2 to 4%.
The special spinneret plate disclosed by the embodiment of the invention simultaneously comprises two or more spinneret holes with different pore diameters, the spinneret holes with different pore diameters have a certain number proportion, the spinneret holes with smaller pore diameters can generate filaments with smaller diameters, and the spinneret holes with larger pore diameters can generate filaments with larger diameters; the orifices in the tailored spinneret are circular in cross-section, which circular holes will produce fibers of circular cross-section that maximize the movement of the fibers relative to each other, thereby maximizing cut resistance. The circular cross-section also maximizes packing density, which also contributes to improved cut resistance.
In embodiments of the invention the arrangement of the larger diameter orifices relative to the smaller diameter orifices in the spinneret is not particularly important, however it is advantageous to have the smaller diameter fibers sandwiched between the larger diameter fibers as this will maximise the rolling of the fibers relative to each other. In a preferred arrangement, the holes in the spinneret are arranged in concentric circles to form an array of large circular holes as a whole; the holes near the center of the array are smaller diameter holes and those near the periphery of the array are larger diameter holes so that the finer filaments are squeezed between the coarser filaments, in this way providing a very stable yarn in terms of segregation and stability during processing.
In a preferred embodiment, to produce a mixed yarn of UHMWPE filaments having two different filament diameters, the smaller orifice has a diameter of 0.35 to 1.0mm, more preferably 0.4 to 0.8mm, and the larger orifice has a diameter of 0.8 to 1.5mm, more preferably 0.8 to 1.2 mm. Wherein the ratio of the diameter between the larger and smaller orifices is 1.25 to 2.4, preferably 1.28 to 1.92, more preferably 1.3 to 1.5. Mixed yarns of UHMWPE continuous filaments having different filament diameters are produced by direct spinning using the tailored spinneret, the UHMWPE filaments in the yarns having a diameter of 5-40 μm, preferably 10-30 μm. Preferably, the average diameter of the smaller monofilament diameter filaments is in the range of 10 to 20 μm and the average diameter of the larger monofilament diameter filaments is in the range of 15 to 30 μm. 20-60% (by number) of the yarn is composed of UHMWPE filaments of larger monofilament diameter, and 40-80% (by number) of the yarn is composed of UHMWPE filaments of smaller monofilament diameter. More preferably, 45-55% (by number) of the filaments in the yarn are comprised of the larger monofilament diameter UNMWPE filaments, and 45-55% (by number) of the filaments in the yarn are comprised of the smaller monofilament diameter UHMWPE filaments. Because the fibers are extruded through the same spinneret and the same spinning and drawing process is adopted, the filament diameter of the fibers in the embodiment of the invention is basically determined by the aperture of the spinneret orifice, and other operation processes are not particularly limited.
In another preferred embodiment, a hybrid yarn of UHMWPE continuous filaments having three different filament diameters is prepared, the smallest orifice having a diameter of 0.35 to 0.8mm, the middle orifice having a diameter of 0.4 to 1.0mm and the largest orifice having a diameter of 0.8 to 1.5 mm. Preferably, the minimum: medium: the ratio of the largest average diameters was 2:3: 4. UHMWPE continuous filament hybrid yarns with different filament diameters are produced by direct spinning using the tailored spinneret, the UHMWPE filament diameter in the yarn being 5-40 μm, preferably 10-30 μm. It is preferred that the average diameter of the UHMWPE filaments of the smallest monofilament diameter is in the range of 10-15 μm, the average diameter of the UHMWPE filaments of the medium monofilament diameter is in the range of 16-23m and the average diameter of the UHMWPE filaments of the largest monofilament diameter is in the range of 20-30 μm. In this case, the difference in filament fineness between the UHMWPE continuous filaments of three different filament diameters in the hybrid yarn is 1D or more, preferably 1.5D or more. 15-35% (by number) of the hybrid yarn is composed of UHMWPE filaments of the largest filament diameter, 30-45% (by number) of the yarn is composed of UHMWPE filaments of medium filament diameter, and 30-45% (by number) of the yarn is composed of UHMWPE filaments of the smallest filament diameter.
In some embodiments of the present invention, the total denier of the non-diameter UHMWPE hybrid yarn may be 400D, or may be 200D, 600D, etc. of the major specifications in the cut resistant field. The hybrid yarn of the present invention has a cut resistance superior to conventional UHMWPE yarns of a single monofilament diameter, i.e. the same cut resistance as UHMWPE yarns of a single monofilament diameter can be obtained by using a smaller amount of UHMWPE filaments or staple fibers of different monofilament diameters making up the hybrid yarn. In the above embodiments, by the common combination of UHMWPE fibers of different filament diameters, the UHMWPE fibers of different filament diameters in the mixed yarn are more susceptible to rolling or sliding tangentially relative to each other, thereby dissipating the forces of attack; while reducing friction between fibers in the hybrid yarn to provide more fiber characteristics, better hand and improved flexibility to fabrics made from such yarns, even when a large amount of relatively larger denier fibers are used in the hybrid yarn, excellent hand and flexibility are provided. The invention only starts from the yarn material, and improves the cutting resistance of the yarn by a simple and effective combination method.
Furthermore, the maximum possible bulk density, which is influenced by the individual titer (fiber diameter) of the fibers in the hybrid yarn and the ratio of the number of fibers of different individual titers, is preferably 80 to 95%, more preferably 90 to 95%, by increasing the degree of packing of the fibers in the hybrid yarn according to the invention, thus providing more material to resist attack.
The present invention, through the common combination of UHMWPE filaments or staple fibers of different monofilament diameters, not only improves the cut resistance of the yarn, but also provides improved abrasion resistance and flexibility, which translates into improved durability and comfort in use, suitable for making cut, abrasion and penetration resistant fabrics with excellent comfort characteristics.
That is, embodiments of the present invention may provide a protective product, such as cut-resistant gloves and the like, made from the non-isodiametric UHMWPE fiber hybrid yarn described above in a knitted manner.
Detailed Description
The following examples further describe embodiments of the invention, but the scope of the invention is not limited thereto, and these examples are given by way of illustration only and are not to be construed as limiting the invention. The invention is not limited to the specific embodiments described herein, but is to be construed as broadly as the invention may be practiced.
In the following examples, the UHMWPE fibers do not contain hard fibers; fiber strength and the like were measured according to GB/T19975.
Comparative examples 1 to 3 and examples 1 to 4
In the following examples 1-4, a blend based on UHMWPE staple fibers of different filament diameters was used, which was made into a hybrid yarn comprising simultaneously two or three UHMWPE staple fibers of different filament diameters by spinning, and the titer of the resulting hybrid yarn of staple fibers was about 400D.
The three selected UHMWPE staple fibers have the length of 50mm, the strength of 32cN/dtex, the modulus of 1100cN/dtex, the elongation at break of 3 percent and the single-fiber fineness of 13 mu m, 16 mu m and 23 mu m respectively. And fully and uniformly mixing the UHMWPE staple fibers with different monofilament diameters in proportion, forming the staple fiber mixture into long strips by using a carding machine, and performing the processes of combing, drawing, roving, spinning and the like to obtain the UHMWPE staple fiber mixed yarn.
The yarns were then woven using the same weaving process to an areal density of about 11.8Oz/yd2(400g/m2) And subjected to the Cut resistance test method (Cut resistance is measured in terms of Ashland Cut resistance Performance (abbreviated as "CPP"), see patent CN1092254C for the following test methods).
The number ratio of UHMWPE staple fibres of different filament diameters in the mixed yarn and the cut resistance test results are shown in table 1. As can be seen from table 1, the non-isodiametric hybrid yarn made of UHMWPE staple fibers of different monofilament diameters provides a fabric with significantly improved cut resistance and superior hand compared to a fabric made of a hybrid yarn of UHMWPE staple fibers of a single monofilament diameter.
In addition, the diameter ratio is not in the range of the application, and the yarns are not easy to generate relative sliding movement to eliminate partial attack force when stressed, so that the aim of obviously improving the cutting resistance cannot be achieved.
Table 1 examples 1-4 number ratio of UHMWPE staple fibers of different filament diameters and cut resistance test results
OSY is the areal density of the fabric, in Oz/yd2And (6) counting.
CPP is the CPP value determined according to the Ashland CPP test method.
CPP/OSY is the ratio of CPP value to areal density (OSY).
Comparative examples 4 to 8 and examples 5 to 10
In the following examples 5 to 10, mixed non-isodiametric yarns comprising UHMWPE filaments of two or three different monofilament diameters simultaneously were obtained using UHMWPE filaments based on different monofilament diameters in the form of continuous filaments in a parallel and plied manner in a specific ratio, and the total titer of the mixed non-isodiametric yarns was about 400D.
The strength of the three selected UHMWPE filaments is 32cN/dtex, and the modulus is 1100 cN/dtex; the elongation at break was 3%, and the diameters of the filaments were 12 μm, 16 μm, 23 μm, and 35 μm, respectively. The yarn was then woven using the same weaving process to an areal density of about 11.8Oz/yd2(400g/m2) And performing a cut resistance test.
The ratio of the number of UHMWPE filaments of different filament diameters in the mixed yarn and the cut resistance test results are shown in table 2. As can be seen from table 2, the non-isodiametric yarns made of UHMWPE filaments of different monofilament diameters produced fabrics, when compared to fabrics made of yarns made of UHMWPE filaments of a single monofilament diameter, have significantly improved cut resistance while meeting the requirements of the present invention, while having excellent flexible hand and comfort.
TABLE 2 number ratio of UHMWPE filaments for different filament diameters and cut resistance test results for examples 5-10
OSY is the areal density of the fabric, in Oz/yd2And (6) counting.
CPP is the CPP value determined according to the Ashland CPP test method.
CPP/OSY is the ratio of CPP value to areal density (OSY).
Comparative examples 9 to 11 and examples 11 to 15
In the following examples 11-15, using a tailored spinneret with two or three different orifice sizes (orifice size and proportion of each orifice size are shown in table 3), UHMWPE feedstock was spun by gel spinning with a white oil ratio of 10: mixing in a mass ratio of 90, dissolving by a double-screw extruder, extruding and spinning by a special spinneret plate, extracting, drying, carrying out high-power hot drawing and the like to obtain non-equal-diameter UHMWPE mixed yarns simultaneously containing UHMWPE filaments with two or three different monofilament diameters, wherein the total titer of the obtained non-equal-diameter mixed yarns is about 400D, the strength is about 32cN/dtex, and the modulus is about 1100 cN/dtex; the elongation at break was about 3%.
The yarn was then woven using the same weaving process to an areal density of about 11.8Oz/yd2(400g/m2) And performing a cut resistance test.
The results of the cut resistance test of the non-isodiametric UHMWPE hybrid yarn produced by a specially made spinneret are shown in table 3. As can be seen from table 3, the non-isodiametric yarns of UHMWPE filaments having different monofilament diameters obtained by the above process produced fabrics having significantly improved cut resistance compared to fabrics produced from yarns of UHMWPE filaments having a single monofilament diameter.
Table 3 examples 11-15 results of cut resistance test on non-equal diameter UHMWPE hybrid yarns produced from specially prepared spinnerets
OSY is the areal density of the fabric, in Oz/yd2And (6) counting.
CPP is the CPP value determined according to the Ashland CPP test method.
CPP/OSY is the ratio of CPP value to areal density (OSY).
In summary, the invention discloses a non-equal-diameter UHMWPE fiber mixed yarn for protective products, which is obtained by combining UHMWPE filaments or staple fibers with two or more different monofilament diameters together to obtain the mixed yarn simultaneously containing the UHMWPE filaments or staple fibers with two or more different monofilament diameters. The mixed yarn has cutting resistance obviously superior to that of UHMWPE yarn with single monofilament diameter, and fabric made of the yarn has excellent hand feeling and flexibility and is suitable for preparing cutting, wear, penetration and puncture resistant products with excellent comfort.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (10)
1. A non-isodiametric UHMWPE fiber hybrid yarn for protective products, characterized by consisting of at least a first UHMWPE fiber and a second UHMWPE fiber of two different diameters, said first UHMWPE fiber and said second UHMWPE fiber together being a filament or a staple; the first UHMWPE fibers have a smaller diameter than the second UHMWPE fibers, the diameter of the first UHMWPE fibers being larger than the largest diameter of the fibers that can be accommodated by the voids formed when the second UHMWPE fibers are packed, and not more than 0.8 times the diameter of the second UHMWPE fibers.
2. The non-isodiametric UHMWPE fiber hybrid yarn according to claim 1, characterized in that the diameter of the first UHMWPE fibers in the hybrid yarn is greater than 0.52 times the diameter of the second UHMWPE fibers and not more than 0.75 times the diameter of the second UHMWPE fibers.
3. The non-isodiametric UHMWPE fiber hybrid yarn according to claim 1, characterized in that the diameter of the first UHMWPE fiber, the diameter of the second UHMWPE fiber of the hybrid yarn are both between 5 and 50 μm; the diameter of the second UHMWPE fibers is above 20 μm, preferably above 35 μm, more preferably above 45 μm.
4. The non-isodiametric UHMWPE fiber hybrid yarn according to claim 1 wherein the second UHMWPE fiber in the hybrid yarn contains hard microfibers with a Mohs hardness of more than 3.5, preferably the hard microfibers are one or more of glass fibers, carbon fibers, basalt fibers, silicon carbide fibers, boron nitride fibers and graphene fibers;
the strength of the first UHMWPE fiber and the strength of the second UHMWPE fiber in the mixed yarn are both preferably more than 30cN/dtex, and more preferably more than 35 cN/dtex; the modulus is preferably 1000cN/dtex or more, more preferably 1200cN/dtex or more.
5. The non-isodiametric UHMWPE fiber hybrid yarn according to any of the claims 1-4, characterized in that the hybrid yarn consists of 40-80% by number of first UHMWPE fibers and 20-60% by number of second UHMWPE fibers; preferably from 45 to 55% of the first UHMWPE fibers and from 45 to 55% of the second UHMWPE fibers.
6. The non-isodiametric UHMWPE fiber hybrid yarn according to any of the claims 1-4, characterized in that the hybrid yarn further comprises a third UHMWPE fiber, the diameter of which is larger than the second UHMWPE fiber.
7. The process for the preparation of the non-isodiametric UHMWPE fibre hybrid yarn according to any of claims 1-4, comprising the steps of:
combing a first UHMWPE fiber and a second UHMWPE fiber after mixing into a long strip, and obtaining a non-isodiametric UHMWPE fiber mixed yarn through combing, drawing, roving and spun yarn in sequence; the first UHMWPE fiber and the second UHMWPE fiber are short fibers together;
or, the first UHMWPE fibers and the second UHMWPE fibers are mixed in the form of fiber bundles or continuous filaments to obtain a non-isodiametric mixed UHMWPE fiber yarn, the first UHMWPE fibers and the second UHMWPE fibers together being filaments.
8. The method of claim 7, wherein the first UHMWPE fiber and the second UHMWPE fiber are both continuous filaments spun using a spinneret plate, the first UHMWPE fiber is passed through a smaller spinneret orifice having a diameter of 0.35-1.0mm, the second UHMWPE fiber is passed through a larger spinneret orifice having a diameter of 0.8-1.5 mm; wherein the ratio of the diameter between the larger and smaller orifices is 1.25 to 2.40, preferably 1.28 to 1.92, more preferably 1.30 to 1.50.
9. The production method according to claim 7, characterized in that the first UHMWPE fibers, the second UHMWPE fibers and the third UHMWPE fibers are mixed in the form of fiber bundles or continuous filaments to obtain a non-isodiametric UHMWPE fiber mixed yarn; the third UHMWPE fibers are filaments having a larger diameter than the second UHMWPE fibers.
10. A protective product made by knitting a non-isodiametric UHMWPE fibre hybrid yarn according to any of claims 1-6.
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| CN1182811A (en) * | 1996-11-19 | 1998-05-27 | 赫希斯特人造丝公司 | Cutting-resistant fibre for filling |
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| CN101522969A (en) * | 2006-10-10 | 2009-09-02 | 纳幕尔杜邦公司 | Multidenier fiber cut resistant fabrics and articles and processes for making same |
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