CN115679469B - Preparation method and application of P34HB fiber - Google Patents
Preparation method and application of P34HB fiber Download PDFInfo
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Abstract
本发明属于高分子材料技术领域，公开了一种P34HB纤维的制备方法和应用。该P34HB纤维的制备方法，包括以下步骤：将P34HB经过干燥，使得P34HB的含水率降到100ppm以下；再经过熔融挤压、纺丝、冷却和牵伸定型，得到P34HB纤维；P34HB中的4‑羟基丁酸酯的摩尔含量为8～15％。本发明P34HB纤维的制备方法，生产工艺简单，可实现P34HB纤维的规模化工业生产，可制得拉伸断裂强度高及断裂伸长率高的纯P34HB纤维，同时具备稳定的可纺性和织造性，满足纺织品的织造要求。The present invention belongs to the technical field of polymer materials, and discloses a preparation method and application of P34HB fiber. The preparation method of the P34HB fiber comprises the following steps: drying the P34HB so that the moisture content of the P34HB is reduced to below 100ppm; then melt extrusion, spinning, cooling and drawing and shaping are performed to obtain the P34HB fiber; the molar content of 4-hydroxybutyrate in the P34HB is 8-15%. The preparation method of the P34HB fiber of the present invention has a simple production process, can realize the large-scale industrial production of the P34HB fiber, can obtain pure P34HB fiber with high tensile breaking strength and high elongation at break, and has stable spinnability and weavability, meeting the weaving requirements of textiles.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a preparation method and application of P34HB fibers.
Background
At present, chemical fiber materials for clothing are mainly terylene (PET), chinlon (PA) and acrylic fiber (PAN) which are manufactured by petroleum, and the raw materials for producing the fibers are not renewable and are difficult to degrade under natural conditions. In order to address the increasingly serious problem of textile waste treatment and to reduce textile materials manufactured from fossil materials, it is highly necessary to develop bio-based degradable textile materials that meet apparel applications. The existing bio-based degradable material polylactic acid (PLA) can be used for clothing application, and is also gradually industrialized, fibers manufactured by the PLA are brittle in performance and poor in hand feeling, modification or blending with other fibers are needed, and the PLA can be rapidly and fully degraded only under specific conditions and is slowly degraded in natural soil and marine environment.
The poly (3-hydroxybutyrate-4-hydroxybutyrate) copolymer, namely P34HB, is a fourth generation degradable PHA material, PHA is a collective name of polyhydroxyalkanoate, the molecular structure of the PHA is linear alkyl acid ester with hydroxyl, the PHA is prepared by microbial fermentation, and compared with other degradable materials, the PHA has the characteristics of non-fossil preparation and seawater degradation and environmental friendliness. The first generation PHA is poly-3-hydroxybutyrate (PHB), and has no practical value because of brittle mechanical properties of materials; the second generation PHA is 3-hydroxybutyrate-3-hydroxyvalerate copolyester (PHBV), and has the application of adding PLA and PA as a blend in the application of fiber materials and has industrialized production; the third generation PHA is 3-hydroxybutyric acid 3-hydroxycaproic acid copolyester (PHBHHX); the fourth generation PHA is poly (3-hydroxybutyrate-4-hydroxybutyrate) copolymer. PHA materials are difficult to process and shape and are more difficult to process into fibers because PHA materials are easily degraded by heat and the decomposition temperature is close to the processing temperature. PHBHHX is prepared into a primary fiber by the prior related technology, and the main process is that the primary fiber is subjected to secondary crystallization for 3min-3h at the temperature of 10-50 ℃ and is subjected to secondary stretching for 10-20 times, so that the strength of the prepared fiber is 50-300 Mpa; however, this method requires a long time for low-temperature crystallization and high-power stretching, and is difficult to produce industrially. There is no report of the related art of processing fourth generation PHAs into fibers.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the invention provides the preparation method and the application of the P34HB fiber, realizes the large-scale industrial production of the P34HB fiber, has simple production process, and can prepare the P34HB fiber with high tensile breaking strength and high breaking elongation.
The first aspect of the invention provides a method for preparing P34HB fiber, comprising the following steps:
Drying the P34HB to reduce the water content of the P34HB to below 100 ppm;
Then carrying out melt extrusion, spinning, cooling and drawing shaping to obtain P34HB fiber;
The molar content of the 4-hydroxybutyrate in the P34HB is 8-15%.
P34HB is a polymer material formed by copolymerizing 3-hydroxybutyrate and 4-hydroxybutyrate, and the structural general formula is shown as follows:
The monomer 3HB has a regular crystal structure and high brittleness, and gives the material rigidity, while the monomer 4HB has rubber-like properties, and since the fiber-forming polymer is a semi-crystalline material, the crystallization property of the material gives the fiber that is aligned and crystallized in the orientation direction of the polymer so as to maintain the fiber strength, the fiber-forming polymer also has crystallinity. As the molar content of 4HB increases, the regularity of 3HB is destroyed, and the steric hindrance of molecules is reduced, and the segment mobility is enhanced, so that crystallization properties are deteriorated, so that the present invention selects an appropriate molar content of 4HB to prepare a fiber having good properties. In addition, as shown in the general structural formula, a large amount of ester bonds-coo-exist in the P34HB molecules, and the ester bonds are hydrolyzed to generate carboxylic acid under a small amount of water in a molten state, so that the molecular weight is reduced, the strength of the fiber is not beneficial to improvement, and a small amount of water is vaporized in a high-temperature melt to form bubbles, and the bubbles are broken due to stress concentration in the fiber stretching process, so that the spinnability and the strength of the nascent silk are affected, and therefore, the water content of the P34HB is controlled to be less than 100 ppm.
Preferably, the molar content of 4-hydroxybutyrate in P34HB is 10-15%.
Preferably, the P34HB is dried such that the water content of the P34HB is reduced to less than 50 ppm.
Preferably, the melt index of P34HB is 10 to 30g/10min at a temperature of 220℃and a pressure of 2.16kg/cm 2.
Preferably, the molecular weight of the P34HB is 30 to 60 ten thousand, and the molecular weight distribution is 1.23 to 1.38.
Preferably, the drying conditions include: the vacuum degree is below 100pa, the drying temperature is 85-125 ℃, and the drying time is 4-12 h.
Preferably, the drying conditions include: the vacuum degree is 50-100 pa, the drying temperature is 105-120 ℃, and the drying time is 8-10 h.
Preferably, the conditions of the melt extrusion include: extruding in 1-6 areas at 220-250 deg.c and 5-10 min for 50-100 MPa.
Preferably, the specific process of melt extrusion comprises: the dried P34HB is added into a single/double screw extruder, the temperature of each zone of the zones 1-6 of the extruder is 220-250 ℃, the residence time of the melt in the screw is 5-8 min, and the head pressure is 50-100 Mpa.
Preferably, the spinning conditions include: the number of holes of the spinneret plate is 5-96 holes, the aperture is 0.1-0.4 mm, and the length-diameter ratio is 2-5.
Preferably, the spinning process comprises the following steps: the melt extruded by the melting is fed into a spinning box body through a metering pump, the temperature in the spinning box body is 220-250 ℃, the pressure is 50-150 Mpa, the residence time of the melt is 5-15 min, the number of holes of a spinneret plate is 12-48 holes, the aperture is 0.28-0.31 mm, and the length-diameter ratio is 2-5.
Preferably, the cooling conditions include: the temperature of the cooling air is 18-28 ℃, the relative humidity is 80-95%, and the wind speed is 0.2-1 m/s.
Preferably, the specific process of cooling comprises: the melt trickle sprayed out of the spinneret plate is cooled by side blowing or circular blowing, the temperature of the cooling air is 18-25 ℃, the relative humidity is 85-95%, the wind speed is 0.5-1 m/s, and then the melt trickle is clustered through an oil nozzle to form tows.
Preferably, the drawing and shaping comprises a first drawing and a second drawing, wherein the temperature of the first drawing is 40-80 ℃, the speed of the first drawing is 100-1000 m/min, the temperature of the second drawing is 90-140 ℃, and the speed of the second drawing is 800-3000 m/min.
Preferably, the drawn and shaped filament bundles are wound and shaped by a winding machine, and the speed of the winding machine is 500-1200 m/min.
Preferably, the drawn and sized tow is passed through a network nozzle for networking prior to winding.
The second aspect of the invention provides a P34HB fiber, which is prepared by adopting the preparation method of the invention, wherein the fineness of the P34HB fiber is 120-220 dtex, the tensile breaking strength is 1.8-2.5 cN/dtex, and the elongation at break is 35-62%.
A third aspect of the invention provides the use of the P34HB fiber of the invention in a textile.
The fourth aspect of the invention provides a fabric woven from the P34HB fibers of the invention.
Compared with the prior art, the invention has the following beneficial effects:
The preparation method of the P34HB fiber has simple production process, can realize large-scale industrial production of the P34HB fiber, can prepare the pure P34HB fiber with high tensile breaking strength and high breaking elongation, has stable spinnability and weaving property, and meets the weaving requirement of textiles.
The P34HB fiber prepared by the invention is a zero-carbon emission material because P34HB is a product derived by biological fermentation rather than petroleum, does not need industrial composting degradation, can be degraded naturally by 100 percent and can be degraded by seawater (different from other degradable materials such as PLA).
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples will be presented. It should be noted that the following examples do not limit the scope of the invention.
The starting materials, reagents, apparatus used in the examples below were obtained from conventional commercial sources, unless otherwise specified, or may be obtained by methods known in the art.
Example 1
A method for preparing P34HB fiber, comprising the steps of:
S1, drying: the P34HB pellets were dried at 120℃in a vacuum oven at a vacuum of 50Pa for 6 hours and had a water content of 48.6ppm as measured according to ISO 15512-1999; wherein the molecular weight of the P34HB particles is 30 ten thousand, the molar content of the molecular weight distribution is 1.38,4-hydroxybutyrate is 15%, and the melt index under the conditions of 220 ℃ and 2.16kg/cm 2 of pressure is 27.4g/10min;
S2, melt extrusion: adding the P34HB particles dried by S1 into a single screw extruder, wherein the temperature of 1-6 areas of the extruder is 220 ℃,223 ℃,225 ℃,225 ℃,225 ℃,225 ℃, the residence time of a melt in a screw is 5min, and the pressure of a machine head is 80Mpa;
s3, spinning: feeding the melt obtained by melt extrusion of S2 into a spinning box body through a metering pump, wherein the temperature in the spinning box body is 235 ℃, the pressure is 100Mpa, the residence time of the melt is 8min, the number of holes of a spinneret plate is 48, the aperture is 0.28mm, and the length-diameter ratio is 2;
S4, cooling: cooling the melt trickle sprayed out of the S3 spinneret plate through a lateral blowing device, wherein the temperature of the lateral blowing is 25 ℃, the relative humidity is 85%, the wind speed is 0.5m/S, the blowing length is 125cm, and then bundling through an oil nozzle to form tows;
s5, drafting and shaping: the silk bundle of the S4 is subjected to first drafting through a first hot roller and second drafting through a second hot roller, wherein the temperature of the first drafting is 60 ℃, the first drafting speed is 100m/min, the temperature of the second drafting is 115 ℃, and the second drafting speed is 800m/min;
S6, winding and forming: and (3) carrying out network on the tows subjected to S5 drafting and shaping through a network nozzle, and then carrying out winding and shaping through a winding machine, wherein the speed of the winding machine is 1000m/min, so as to obtain the P34HB fiber with the specification of 220 dtex/48F.
Example 2
A method for preparing P34HB fiber, comprising the steps of:
S1, drying: the P34HB pellets were dried at 120℃in a vacuum oven having a vacuum of 50Pa for 6 hours and had a water content of 42.3ppm as measured in accordance with ISO 15512-1999; wherein the molecular weight of the P34HB particles is 40 ten thousand, the molecular weight distribution is 1.28,4-hydroxybutyrate, the molar content is 12%, and the melt index under the conditions of 220 ℃ and 2.16kg/cm 2 of pressure is 20.2g/10min;
S2, melt extrusion: adding the P34HB particles dried by S1 into a single screw extruder, wherein the temperature of 1-6 areas of the extruder is 230 ℃,233 ℃,235 ℃,235 ℃,235 ℃, the residence time of a melt in a screw is 6min, and the head pressure is 50Mpa;
S3, spinning: feeding the melt obtained by the melt extrusion of S2 into a spinning box body through a metering pump, wherein the temperature in the spinning box body is 245 ℃, the pressure is 50Mpa, the residence time of the melt is 10min, the number of holes of a spinneret plate is 24 holes, the aperture is 0.28mm, and the length-diameter ratio is 2;
S4, cooling: cooling the melt trickle sprayed out of the S3 spinneret plate through a lateral blowing device, wherein the temperature of the lateral blowing is 25 ℃, the relative humidity is 85%, the wind speed is 0.5m/S, the blowing length is 125cm, and then bundling through an oil nozzle to form tows;
S5, drafting and shaping: the silk bundle of the S4 is subjected to first drafting through a first hot roller and second drafting through a second hot roller, wherein the temperature of the first drafting is 40 ℃, the first drafting speed is 500m/min, the temperature of the second drafting is 90 ℃, and the second drafting speed is 3000m/min;
S6, winding and forming: and (3) carrying out network on the tows subjected to S5 draft shaping through a network nozzle, and then carrying out winding shaping through a winding machine, wherein the speed of the winding machine is 1200m/min, so as to obtain the P34HB fiber with the specification of 170 dtex/24F.
Example 3
A method for preparing P34HB fiber, comprising the steps of:
S1, drying: the P34HB pellets were dried at 120℃in a vacuum oven having a vacuum of 50Pa for 6 hours and had a water content of 47.5ppm as measured in accordance with ISO 15512-1999; wherein the molecular weight of the P34HB particles is 50 ten thousand, the molecular weight distribution is 1.26,4-hydroxybutyrate, the molar content is 10%, and the melt index under the conditions of 220 ℃ and 2.16kg/cm 2 of pressure is 17.6g/10min;
s2, melt extrusion: adding the P34HB particles dried by the S1 into a single screw extruder, wherein the temperature of a 1-6 region of the extruder is 240 ℃,243 ℃,245 ℃,245 ℃,245 ℃,245 ℃, the residence time of a melt in a screw is 6min, and the pressure of a machine head is 100Mpa;
S3, spinning: feeding the melt obtained by melt extrusion of S2 into a spinning box body through a metering pump, wherein the temperature in the spinning box body is 245 ℃, the pressure is 150Mpa, the residence time of the melt is 10min, the number of holes of a spinneret plate is 12, the aperture is 0.31mm, and the length-diameter ratio is 2;
S4, cooling: cooling the melt trickle sprayed out of the S3 spinneret plate through a lateral blowing device, wherein the temperature of the lateral blowing is 25 ℃, the relative humidity is 85%, the wind speed is 0.5m/S, the blowing length is 125cm, and then bundling through an oil nozzle to form tows;
S5, drafting and shaping: the silk bundle of the S4 is subjected to first drafting through a first hot roller and second drafting through a second hot roller, wherein the temperature of the first drafting is 80 ℃, the first drafting speed is 300m/min, the temperature of the second drafting is 140 ℃, and the second drafting speed is 1800m/min;
S6, winding and forming: and (3) carrying out network on the tows subjected to S5 draft shaping through a network nozzle, and then carrying out winding shaping through a winding machine, wherein the speed of the winding machine is 1200m/min, so as to obtain the P34HB fiber with the specification of 120 dtex/12F.
Comparative example 1 (the difference from example 1 is that the water content of P34HB particles is too high)
A method for preparing P34HB fiber, comprising the steps of:
S1, drying: the P34HB pellets were dried at 120℃under a vacuum oven having a vacuum of 50Pa for 3 hours and had a water content of 200ppm as measured in accordance with ISO 15512-1999; wherein the molecular weight of the P34HB particles is 30 ten thousand, the molar content of the molecular weight distribution is 1.38,4-hydroxybutyrate is 15%, and the melt index under the conditions of 220 ℃ and 2.16kg/cm 2 of pressure is 40.5g/10min;
S2, melt extrusion: adding the P34HB particles dried by S1 into a single screw extruder, wherein the temperature of 1-6 areas of the extruder is 220 ℃,223 ℃,225 ℃,225 ℃,225 ℃,225 ℃, the residence time of a melt in a screw is 5min, and the pressure of a machine head is 80Mpa;
s3, spinning: feeding the melt obtained by melt extrusion of S2 into a spinning box body through a metering pump, wherein the temperature in the spinning box body is 235 ℃, the pressure is 100Mpa, the residence time of the melt is 8min, the number of holes of a spinneret plate is 48, the aperture is 0.28mm, and the length-diameter ratio is 2;
S4, cooling: cooling the melt trickle sprayed out of the S3 spinneret plate through a lateral blowing device, wherein the temperature of the lateral blowing is 25 ℃, the relative humidity is 85%, the wind speed is 0.5m/S, the blowing length is 125cm, and then bundling through an oil nozzle to form tows;
s5, drafting and shaping: the silk bundle of the S4 is subjected to first drafting through a first hot roller and second drafting through a second hot roller, wherein the temperature of the first drafting is 60 ℃, the first drafting speed is 100m/min, the temperature of the second drafting is 115 ℃, and the second drafting speed is 800m/min;
S6, winding and forming: and (3) carrying out network on the tows subjected to S5 drafting and shaping through a network nozzle, and then carrying out winding and shaping through a winding machine, wherein the speed of the winding machine is 1000m/min, so as to obtain the P34HB fiber with the specification of 220 dtex/48F.
Comparative example 2 (the difference from example 1 is that the molar content of 4-hydroxybutyrate in P34HB is too low)
A method for preparing P34HB fiber, comprising the steps of:
S1, drying: the P34HB pellets were dried at 120℃in a vacuum oven having a vacuum of 50Pa for 6 hours and had a water content of 42.3ppm as measured in accordance with ISO 15512-1999; wherein the molecular weight of the P34HB particles is 30 ten thousand, the molecular weight distribution is 1.38,4 percent of the molar content of the hydroxybutyrate, and the melt index under the conditions of 220 ℃ and 2.16kg/cm 2 of pressure is 18.4g/10min;
S2, melt extrusion: adding the P34HB particles dried by S1 into a single screw extruder, wherein the temperature of 1-6 areas of the extruder is 220 ℃,223 ℃,225 ℃,225 ℃,225 ℃,225 ℃, the residence time of a melt in a screw is 5min, and the pressure of a machine head is 80Mpa;
s3, spinning: feeding the melt obtained by melt extrusion of S2 into a spinning box body through a metering pump, wherein the temperature in the spinning box body is 235 ℃, the pressure is 100Mpa, the residence time of the melt is 8min, the number of holes of a spinneret plate is 48, the aperture is 0.28mm, and the length-diameter ratio is 2;
S4, cooling: cooling the melt trickle sprayed out of the S3 spinneret plate through a lateral blowing device, wherein the temperature of the lateral blowing is 25 ℃, the relative humidity is 85%, the wind speed is 0.5m/S, the blowing length is 125cm, and then bundling through an oil nozzle to form tows;
s5, drafting and shaping: the silk bundle of the S4 is subjected to first drafting through a first hot roller and second drafting through a second hot roller, wherein the temperature of the first drafting is 60 ℃, the first drafting speed is 100m/min, the temperature of the second drafting is 115 ℃, and the second drafting speed is 800m/min;
S6, winding and forming: and (3) carrying out network on the tows subjected to S5 drafting and shaping through a network nozzle, and then carrying out winding and shaping through a winding machine, wherein the speed of the winding machine is 1000m/min, so as to obtain the P34HB fiber with the specification of 220 dtex/48F.
Comparative example 3 (the difference from example 1 is that the molar content of 4-hydroxybutyrate in P34HB is too high)
A method for preparing P34HB fiber, comprising the steps of:
s1, drying: the P34HB pellets were dried at 120℃in a vacuum oven having a vacuum of 50Pa for 6 hours and had a water content of 47.6ppm as measured in accordance with ISO 15512-1999; wherein the molecular weight of the P34HB particles is 30 ten thousand, the molecular weight distribution is 1.38,4-hydroxybutyrate, the molar content is 20%, and the melt index under the conditions of 220 ℃ and 2.16kg/cm 2 of pressure is 41.1g/10min;
S2, melt extrusion: adding the P34HB particles dried by S1 into a single screw extruder, wherein the temperature of 1-6 areas of the extruder is 220 ℃,223 ℃,225 ℃,225 ℃,225 ℃,225 ℃, the residence time of a melt in a screw is 5min, and the pressure of a machine head is 80Mpa;
s3, spinning: feeding the melt obtained by melt extrusion of S2 into a spinning box body through a metering pump, wherein the temperature in the spinning box body is 235 ℃, the pressure is 100Mpa, the residence time of the melt is 8min, the number of holes of a spinneret plate is 48, the aperture is 0.28mm, and the length-diameter ratio is 2;
S4, cooling: cooling the melt trickle sprayed out of the S3 spinneret plate through a lateral blowing device, wherein the temperature of the lateral blowing is 25 ℃, the relative humidity is 85%, the wind speed is 0.5m/S, the blowing length is 125cm, and then bundling through an oil nozzle to form tows;
s5, drafting and shaping: the silk bundle of the S4 is subjected to first drafting through a first hot roller and second drafting through a second hot roller, wherein the temperature of the first drafting is 60 ℃, the first drafting speed is 100m/min, the temperature of the second drafting is 115 ℃, and the second drafting speed is 800m/min;
S6, winding and forming: and (3) carrying out network on the tows subjected to S5 drafting and shaping through a network nozzle, and then carrying out winding and shaping through a winding machine, wherein the speed of the winding machine is 1000m/min, so as to obtain the P34HB fiber with the specification of 220 dtex/48F.
The properties and spinnability of the fibers prepared in examples 1 to 3 and comparative examples 1 to 3 are shown in Table 1.
TABLE 1
The spinning breaking times refer to the breaking times of the melt entering a spinning box for spinning in the preparation step S3 of the P34HB fiber.
As can be seen from the data in Table 1, the preparation method of the invention in examples 1-3 has significantly lower spinning break times than that of comparative examples 1-3, and the comparative examples 1-3 have excessive spinning break times and no spinnability; it can be seen that the pure P34HB fiber with high tensile breaking strength and high breaking elongation can be prepared in the embodiments 1-3 of the invention, and meanwhile, the pure P34HB fiber has stable spinnability and weaving property, and meets the weaving requirement of textiles.
The fibers prepared in examples 1-3 were woven using a conventional weft knitting machine to obtain a terry cloth. The cloth properties are shown in Table 2.
TABLE 2
As can be seen from the data in Table 2, excellent beaded cloths were produced using the fibers of examples 1-3 of the present invention.
While the preferred embodiment of the present application has been described in detail, the application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the application, and these modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (7)
1. A method for preparing P34HB fiber, comprising the steps of:
Drying the P34HB to reduce the water content of the P34HB to below 100 ppm;
Then carrying out melt extrusion, spinning, cooling and drawing shaping to obtain P34HB fiber;
The molar content of the 4-hydroxybutyrate in the P34HB is 8-15%;
The conditions of the melt extrusion include: extruding in 1-6 areas with the temperature of 220-250 deg.c, the residence time of the melt of 8 or 10min and the pressure of 50-100 MPa;
The spinning conditions include: the number of holes of the spinneret plate is 5-96 holes, the aperture is 0.1-0.4 mm, and the length-diameter ratio is 2-5;
The drawing and shaping comprises a first drawing and a second drawing, wherein the temperature of the first drawing is 40-80 ℃, the speed of the first drawing is 100-1000 m/min, the temperature of the second drawing is 90-140 ℃, and the speed of the second drawing is 800-3000 m/min.
2. The process according to claim 1, wherein the melt index of P34HB is 10 to 30g/10min at a temperature of 220℃and a pressure of 2.16kg/cm 2.
3. The method of claim 1, wherein the drying conditions comprise: the vacuum degree is below 100pa, the drying temperature is 85-125 ℃, and the drying time is 4-12 h.
4. The method of claim 1, wherein the cooling conditions comprise: the temperature of the cooling air is 18-28 ℃, the relative humidity is 80-95%, and the wind speed is 0.2-1 m/s.
5. A P34HB fiber produced by the production method according to any one of claims 1 to 4, wherein the fineness of the P34HB fiber is 120 to 220dtex, the tensile break strength is 1.8 to 2.5cN/dtex, and the elongation at break is 35 to 62%.
6. Use of the P34HB fiber of claim 5 in textiles.
7. A fabric woven from the P34HB fiber of claim 5.
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