CN115247289A - Co-spun fibers and methods of making the same - Google Patents
Co-spun fibers and methods of making the same Download PDFInfo
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- CN115247289A CN115247289A CN202210102809.XA CN202210102809A CN115247289A CN 115247289 A CN115247289 A CN 115247289A CN 202210102809 A CN202210102809 A CN 202210102809A CN 115247289 A CN115247289 A CN 115247289A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/02—Preparation of spinning solutions
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/16—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one other macromolecular compound obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds as constituent
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Abstract
A co-spun fiber and a preparation method thereof, belonging to the technical field of fiber. The raw materials of the co-spun fiber comprise polyaryl oxadiazole and poly-p-phenylene terephthalamide. The preparation method of the co-spun fiber comprises the following steps: spinning the spinning solution to obtain the co-spun fiber, wherein a solvent in the spinning solution comprises concentrated sulfuric acid or fuming sulfuric acid, and polyaryl oxadiazole and poly-p-phenylene terephthalamide are dissolved in the solvent. Which can improve the problem of low strength of the polyaryl oxadiazole fiber.
Description
Technical Field
The application relates to the technical field of fibers, in particular to a co-spun fiber and a preparation method thereof.
Background
Polyaryl Oxadiazole (POD) is an aromatic high-temperature-resistant polymer, can be processed into fibers, and is used in the fields of protective fabrics, composite materials, heat insulation materials and the like. The aromatic polyoxadiazole fiber has the advantages of good flexibility and good fatigue resistance, but the molecular chain structure of the aromatic polyoxadiazole is spirally twisted, and with the increase of molecular weight, the macromolecules are seriously tangled, and a high orientation structure is not easily formed in molding processing, so that the formed aromatic polyoxadiazole fiber has low strength.
Disclosure of Invention
The application provides a co-spun fiber and a preparation method thereof, which can solve the problem of low strength of a polyaryl oxadiazole fiber.
The embodiment of the application is realized as follows:
in a first aspect, embodiments of the present application provide a co-spun fiber, the co-spun fiber being made from a material comprising a polyaryl oxadiazole and a poly (paraphenylene terephthalamide).
In a second aspect, embodiments of the present application provide a method for preparing a co-spun fiber, including: spinning the spinning solution to obtain the co-spun fiber, wherein the solvent in the spinning solution comprises concentrated sulfuric acid or fuming sulfuric acid, and polyaryl oxadiazole and poly-p-phenylene terephthamide are dissolved in the solvent.
The embodiment of the application at least comprises the following beneficial effects:
in the preparation method of the co-spun fiber, both the polyaryl oxadiazole and the poly-p-phenylene terephthalamide can be dissolved in concentrated sulfuric acid or fuming sulfuric acid, the formed spinning solution can be used for spinning, the rigid rod-shaped structure of the poly-p-phenylene terephthalamide has the effect of inducing the orientation of the molecular chain of the polyaryl oxadiazole in the spinning process, the drafting multiple of the polyaryl oxadiazole is effectively improved in the spinning process, the orientation degree of the polyaryl oxadiazole fiber is improved, and the strength of the obtained co-spun fiber is high.
The raw materials of the co-spun fiber contain the polyaryl oxadiazole and the poly-p-phenylene terephthamide, compared with the single polyaryl oxadiazole fiber, the strength of the co-spun fiber is higher, and the problem of low strength of the polyaryl oxadiazole fiber is solved.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The co-spun fiber and the preparation method thereof according to the embodiments of the present application are specifically described below:
in a first aspect, embodiments of the present application provide a co-spun fiber, the co-spun fiber being made from a material comprising a polyaryl oxadiazole and a poly (paraphenylene terephthalamide).
It should be noted that co-spinning refers to a spinning method in which more than one polymer melt or concentrated solution is uniformly mixed and spun into fibers. Wherein, the single Polyaryl Oxadiazole (POD) fiber has good flexibility, better fatigue resistance, higher elongation and lower strength. The raw materials of the co-spun fiber in the embodiment of the application comprise polyaryl oxadiazole and poly (p-phenylene terephthalamide) (PPTA for short), and the overall strength of the co-spun fiber is higher than that of a single polyaryl oxadiazole fiber. In addition, the inventor of the present application found in research that the single poly-p-phenylene terephthalamide fiber has lower elongation at break and poor fatigue resistance, while the co-spun fiber of the present application example has higher elongation at break than the single poly-p-phenylene terephthalamide fiber, and the co-spun fiber has higher strength and elongation at break at the same time.
The co-spun fibers of the examples of the present application were tested to have a breaking strength of 4.5 to 10.0cN/dtex, e.g., any one or a number between 4.5cN/dtex, 5cN/dtex, 6cN/dtex, 7cN/dtex, 8cN/dtex, 9cN/dtex, 10 cN/dtex.
The co-spun fibers of the embodiments herein have an elongation at break of 10 to 30%, such as any one of 10%, 15%, 20%, 25%, and 30%, or a value between any two.
In terms of molecular structure, although the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) are rigid chain structures, the molecular chain conformation of the polyaryl oxadiazole is spirally twisted, and with the increase of molecular weight, the macromolecules are seriously entangled, so that high orientation is not easily formed in the process of spinning to form fibers, and the strength is low.
The rigid rod-shaped structure of the poly (p-phenylene terephthalamide) has the effect of inducing the orientation of the molecular chain of the polyaryl oxadiazole, and the drafting multiple of the polyaryl oxadiazole can be effectively improved in the spinning process, so that the orientation degree of the polyaryl oxadiazole is improved; on the other hand, nitrogen atoms and oxygen atoms on oxadiazole groups in the polyaryl oxadiazole molecular chain can form hydrogen bonds with amido bonds on the poly-p-phenylene terephthamide molecular chain, so that intermolecular force is further improved, the strength is further improved, and the co-spun fiber with higher strength is obtained.
In some embodiments, the mass ratio of polyaryl oxadiazole to poly (paraphenylene terephthalamide) is 5 to 9:1 to 5, the co-spun fiber has a tenacity at break of 5.0 to 9.5cN/dtex and an elongation at break of 13 to 27%.
Illustratively, the mass ratio of polyaryl oxadiazole to poly (paraphenylene terephthalamide) is 9:1, 8:2, 7:3, 6:4, or 1:1.
The inventor of the application finds in research that when the quality of the poly-p-phenylene terephthalamide in the raw material is high, the poly-aromatic oxadiazole can play a plasticizing role, the poly-aromatic oxadiazole destroys the regular structure of the poly-p-phenylene terephthalamide, but also increases the flexibility of the whole system, and compared with the single poly-p-phenylene terephthalamide fiber, the anti-fatigue performance of the co-spun fiber is higher.
In a second aspect, embodiments of the present application provide a method for preparing a co-spun fiber, including: spinning the spinning solution to obtain the co-spun fiber, wherein a solvent in the spinning solution comprises concentrated sulfuric acid or fuming sulfuric acid, the polyaryl oxadiazole and the poly-p-phenylene terephthalamide are dissolved in the solvent, and the polyaryl oxadiazole and the poly-p-phenylene terephthalamide are dissolved in the concentrated sulfuric acid.
Illustratively, the concentrated sulfuric acid has a concentration of 92 to 100%, such as any one or a range between any two of 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and 100%.
Wherein the oleum refers to sulfuric acid solution of sulfur trioxide, and has a chemical formula of H 2 SO 4 ·xSO 3 It is colorless to light brown viscous fuming liquid, and the density, melting point and boiling point of the liquid are caused by SO 3 The content varies depending on the content. Illustratively, free SO in oleum 3 Less than or equal to 65 percent, and the concentration of the sulfuric acid is less than or equal to 114.65 percent. Note that free SO in oleum 3 When the concentration is 65%, the concentration is 114.65%. Optionally free SO in oleum 3 Is any one of 1%, 3%, 5%, 10%, 15%, 20%, 30%, 40%, 50%, 60%, and 65%, or a value between any two.
The polyaryl oxadiazole and the poly-p-phenylene terephthalamide can be dissolved in concentrated sulfuric acid or fuming sulfuric acid to form a transparent and clear spinning solution, a liquid crystal phase cannot be formed, spinning can still be carried out, the rigid rod-shaped structure of the poly-p-phenylene terephthalamide has the effect of inducing the molecular chain orientation of the polyaryl oxadiazole in the spinning process, the drafting multiple of the polyaryl oxadiazole is effectively improved in the spinning process, the orientation degree of the polyaryl oxadiazole fiber is improved, and the strength of the obtained co-spun fiber is high.
Wherein the spinning solution can be prepared by a variety of preparation methods, in some embodiments, the spinning solution is prepared by steps comprising: the sulfuric acid solution of poly (p-phenylene terephthalamide) was mixed with the polyaryl oxadiazole.
In other embodiments, the step of preparing the spinning solution comprises: a sulfuric acid solution of polyaryl oxadiazole was mixed with poly (p-phenylene terephthalamide).
In other embodiments, the step of preparing the spinning solution comprises: the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) are mixed with concentrated sulfuric acid. For example, the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) may be put into a dissolution vessel and then dissolved by adding a sulfuric acid solution. Alternatively, the sulfuric acid solution may be added to the dissolution vessel, and the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) may be added together to the dissolution vessel to be dissolved.
It should be noted that the sulfuric acid solution in the above embodiments may be concentrated sulfuric acid or fuming sulfuric acid. The polyaryl oxadiazole and the polyparaphenylene terephthalamide may be in the form of particles or fibers before being dissolved in the sulfuric acid solution.
In some embodiments, the mass ratio of the polyaryl oxadiazole to the polyparaphenylene terephthalamide in the spinning solution is 50 to 99. Illustratively, the mass ratio of the polyaryl oxadiazole to the poly (paraphenylene terephthalamide) in the spinning solution is 99: 1. 9:1, 8:2, 7:3, 6:4, or 1:1.
In some embodiments, the mass ratio of polyaryl oxadiazole to poly (paraphenylene terephthalamide) in the spinning solution is from 5 to 9:1-5, from 5 to 7:3-5, from 6 to 8:2 to 4 or 6 to 9:1 to 4.
In some embodiments, the sum of the mass of the polyaryl oxadiazole and the poly (paraphenylene terephthalamide) in the spinning solution is 5 to 12% of the mass of the spinning solution, such as any one or a number between any two of 5%, 8%, 10%, and 12%.
Further, the spinning solution may be spun by a wet spinning method or a dry-wet spinning method, wherein the dry-wet spinning method is a spinning technique combining the dry spinning method and the wet spinning method.
Wherein, the wet spinning process comprises the following steps: solution defoaming → solution filtering → extrusion of a spinneret into a coagulating bath → first drafting roller drafting → second drafting roller drafting → third drafting roller drafting → water washing bath neutralization and washing → drying → sizing → winding into a tube or cutting and then packaging.
The dry-wet spinning process comprises the following steps: solution deaeration → solution filtration → extrusion of spinneret into air bath → coagulation bath → first drafting roller drafting → second drafting roller drafting → third drafting roller drafting → water bath neutralization and washing → drying → sizing → winding into tube or cutting and packing.
In one embodiment, the step of wet spinning the spinning solution comprises:
s1: standing and defoaming the spinning solution under the pressure of less than 1000 Pa;
s2: filtering the defoamed spinning solution by adopting a stainless steel metal sintered felt with the filtering precision of 20 mu m;
s3: and (3) introducing the filtered spinning solution into a spinning nozzle, spraying out trickle through a spinning hole with the diameter of 0.07-0.10 mm, and entering a coagulating bath with the temperature of 20-60 ℃ to form primary fiber. Wherein the coagulating bath contains dilute sulfuric acid with volume concentration less than or equal to 50%;
s4: sequentially utilizing a first drafting roller with a drafting ratio of 0.6-1.5, a second drafting roller with a drafting ratio of 1.5-3.0 and a third drafting roller with a drafting ratio of 1-2 to draft to obtain co-spun fibers;
s5: washing the co-spun fiber by using a sodium bicarbonate solution with the concentration of 5g/L as a neutralization reagent;
s6: drying the co-spun fiber at the temperature of 100-150 ℃;
s7: setting the co-spun fiber at 300-450 deg.c;
s8: winding into a tube or cutting and packing.
In one embodiment, the step of dry-wet spinning the spinning solution comprises:
s1: standing and defoaming the spinning solution under the pressure of less than 1000 Pa;
s2: filtering the defoamed spinning solution by adopting a stainless steel metal sintered felt with the filtering precision of 10 mu m;
s3: the filtered spinning solution is led into a spinning nozzle, and is sprayed out through a spinning hole with the length of 0.08-0.12 mm to form a trickle, and then enters an air bath with the length of 10-30 mm, and then enters a coagulating bath with the temperature of 20-60 ℃ to form primary fibers. Wherein the coagulating bath contains dilute sulfuric acid with volume concentration less than or equal to 50%;
s4: sequentially utilizing a first drafting roller with a drafting ratio of 1.5-4.5, a second drafting roller with a drafting ratio of 1.0-2.0 and a third drafting roller with a drafting ratio of 1.0-1.5 to draft to obtain co-spun fibers;
s5: washing the co-spun fiber by using a sodium bicarbonate solution with the concentration of 5g/L as a neutralization reagent;
s6: drying the co-spun fiber at the temperature of 100-150 ℃;
s7: setting the co-spun fiber at 300-450 deg.c;
s8: winding into tube or cutting and packing.
The co-spun fibers of the present application and the method of making the same are described in further detail below with reference to examples.
Example 1
This example provides a method of making a co-spun fiber, comprising:
(1) Dissolving 9kg of polyaryl oxadiazole and 1kg of poly (p-phenylene terephthalamide) in 100kg of concentrated sulfuric acid (the concentration is 98%) to obtain a spinning solution;
(2) Standing and defoaming the spinning solution under the pressure of 800 Pa;
(3) Filtering the defoamed spinning solution by adopting a stainless steel metal sintered felt with the filtering precision of 20 mu m;
(4) And (3) introducing the filtered spinning solution into a spinning nozzle, spraying out a trickle through a spinning hole with the diameter of 0.10mm, and entering a coagulating bath with the temperature of 50 ℃ to form nascent fibers. Wherein the coagulating bath contains dilute sulfuric acid with volume concentration of 40%;
(5) Sequentially utilizing a first drafting roller with a drafting ratio of 1, a second drafting roller with a drafting ratio of 1.5 and a third drafting roller with a drafting ratio of 2 to draft to obtain co-spun fibers;
(6) Washing the co-spun fiber by using a sodium bicarbonate solution with the concentration of 5g/L as a neutralization reagent;
(7) The co-spun fibres were dried at a temperature of 120 ℃.
Example 2
Example 2 provides a method of producing a co-spun fiber, which differs from example 1 only in the difference between the quality of the polyaryl oxadiazole and the quality of the poly (p-phenylene terephthalamide) in the production step (1) of example 2, wherein the amount of the polyaryl oxadiazole and the amount of the poly (p-phenylene terephthalamide) in example 2 are 8kg and 2kg, respectively.
Example 3
Example 3 provides a method of producing a co-spun fiber, which differs from example 1 only in the mass of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in the production step (1) of example 3, wherein the amount of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in example 3 is 7kg and 3kg, respectively.
Example 4
Example 4 provides a method of producing a co-spun fiber, which differs from example 1 only in the mass of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in the production step (1) of example 4, wherein the amount of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in example 4 is 6kg and 4kg, respectively.
Example 5
Example 5 provides a method of producing a co-spun fiber, which differs from example 1 only in the mass of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in the production step (1) of example 5, wherein the amount of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in example 5 is 5kg and 5kg, respectively.
Example 6
Example 6 provides a method of producing a co-spun fiber which differs from example 1 only in the amounts of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in the production step (1) of example 6, wherein the amounts of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in example 6 are 4kg and 6kg, respectively.
Example 7
Example 7 provides a method of producing a co-spun fiber which differs from example 1 only in the mass of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in the production step (1) of example 7, wherein the amount of the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) in example 7 is 2kg and 8kg, respectively.
Example 8
Example 8 provides a method of producing a co-spun fiber, the production steps of which differ from those of example 1 only in the mass of concentrated sulfuric acid in the production step (1) of example 8, wherein the mass of concentrated sulfuric acid in example 8 is 75kg.
Example 9
Example 9 provides a method of producing a co-spun fiber, the production steps of which differ from those of example 1 only in the mass of concentrated sulfuric acid in the production step (1) of example 9, wherein the mass of concentrated sulfuric acid in example 9 is 190kg.
Comparative example 1
This comparative example provides a method of making a polyaryl oxadiazole fiber comprising:
(1) Dissolving 10kg of polyaryl oxadiazole in 100kg of concentrated sulfuric acid (the concentration is 98%) to obtain a spinning solution;
(2) Standing and defoaming the spinning solution under the pressure of 800 Pa;
(3) Filtering the defoamed spinning solution by adopting a stainless steel metal sintered felt with the filtering precision of 20 mu m;
(4) And (3) introducing the filtered spinning solution into a spinning nozzle, spraying out a trickle through a spinning hole with the diameter of 0.10mm, and entering a coagulating bath with the temperature of 50 ℃ to form nascent fibers. Wherein the coagulating bath contains 40% dilute sulfuric acid by volume concentration;
(5) Sequentially utilizing a first drawing roller with a drawing ratio of 1, a second drawing roller with a drawing ratio of 1.5 and a third drawing roller with a drawing ratio of 2 to draw to obtain the polyaryloxadiazole fiber;
(6) Washing the polyaryl oxadiazole fiber by taking a sodium bicarbonate solution with the concentration of 5g/L as a neutralizing reagent;
(7) Drying the polyaryl oxadiazole fiber at the temperature of 120 ℃.
Comparative example 2
The present comparative example provides a method of making a poly (p-phenylene terephthalamide) fiber, comprising:
(1) Dissolving 25kg of poly (p-phenylene terephthalamide) in 100kg of concentrated sulfuric acid (with the concentration of 98%) to obtain a spinning solution;
(2) Standing and defoaming the spinning solution under the pressure of 800 Pa;
(3) Filtering the defoamed spinning solution by adopting a stainless steel metal sintered felt with the filtering precision of 20 mu m;
(4) And (3) introducing the filtered spinning solution into a spinning nozzle, spraying out a trickle through a spinning hole with the diameter of 0.10mm, firstly introducing the trickle into an air bath, and then introducing the trickle into a coagulating bath with the temperature of 10 ℃ to form primary fibers. Wherein the coagulating bath contains dilute sulphuric acid with volume concentration of 15%;
(5) Sequentially drafting by using a first drafting roller with a drafting ratio of 5, a second drafting roller with a drafting ratio of 1.1 and a third drafting roller with a drafting ratio of 1.05 to obtain the p-phenylene terephthalamide fiber;
(6) Washing the poly-p-phenylene terephthamide fiber by taking a sodium bicarbonate solution with the concentration of 5g/L as a neutralization reagent;
(7) Drying the poly-p-phenylene terephthamide fiber at the temperature of 120 ℃.
Test examples
The co-spun fibers from examples 1 to 9, the polyaradiazole fiber from comparative example 1, and the polyparaphenylene terephthalamide fiber from comparative example 2 were tested for breaking strength and elongation at break and the results are reported in table 1. The test standard of the breaking strength and the breaking elongation rate refers to GB/T14337.
TABLE 1 Performance test results of fibers
| Breaking strength/cN/dtex | Elongation at break/% | |
| Example 1 | 5.3 | 26.8 |
| Example 2 | 5.9 | 23.4 |
| Example 3 | 7.2 | 21.2 |
| Example 4 | 8.7 | 16.8 |
| Example 5 | 9.2 | 13.0 |
| Example 6 | 10.5 | 11.4 |
| Example 7 | 12.8 | 10.2 |
| Example 8 | 5.1 | 24.6 |
| Example 9 | 5.7 | 28.5 |
| Comparative example 1 | 4.1 | 32.3 |
| Comparative example 2 | 18.6 | 5.1 |
As can be seen from the results in table 1, the co-spun fibers prepared in the examples of the present application have a significantly improved breaking strength and an significantly improved elongation at break compared to the poly (aryleneoxadiazole) fibers prepared in comparative example 1. The co-spun fiber prepared by the embodiment of the application has higher strength and elongation at break at the same time.
The foregoing is merely exemplary of the present application and is not intended to limit the present application, which may be modified or varied by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The co-spun fiber is characterized in that raw materials of the co-spun fiber comprise polyaryl oxadiazole and poly-p-phenylene terephthalamide.
2. The co-spun fiber according to claim 1, wherein the co-spun fiber has a breaking strength of 4.5 to 10.0cN/dtex and an elongation at break of 10.0 to 30.0%.
3. The co-spun fiber of claim 2, wherein the mass ratio of the polyaryl oxadiazole to the poly (p-phenylene terephthalamide) is 5 to 9:1 to 5, the co-spun fiber has a breaking strength of 5.0 to 9.5cN/dtex and an elongation at break of 13 to 27%.
4. A method of making a co-spun fiber, comprising: spinning a spinning solution to obtain the co-spun fiber, wherein a solvent in the spinning solution comprises concentrated sulfuric acid or fuming sulfuric acid, and polyaryl oxadiazole and poly-p-phenylene terephthalamide are dissolved in the solvent.
5. The method of preparing a co-spun fiber according to claim 4, wherein the step of preparing the spinning solution comprises: a sulfuric acid solution of poly (paraphenylene terephthalamide) is mixed with the polyaryl oxadiazole.
6. The method of preparing a co-spun fiber according to claim 4, wherein the step of preparing the spinning solution comprises: a solution of polyaryl oxadiazole in sulfuric acid is mixed with the poly (paraphenylene terephthalamide).
7. The method of preparing a co-spun fiber according to claim 4, wherein the step of preparing the spinning solution comprises: mixing the polyaryl oxadiazole and the poly (p-phenylene terephthalamide) together with concentrated sulfuric acid.
8. The method of producing a co-spun fiber according to any one of claims 4 to 7, wherein the mass ratio of the polyaryl oxadiazole to the poly (paraphenylene terephthalamide) in the spinning solution is 50 to 99; optionally, the mass ratio of the polyaryl oxadiazole to the polyparaphenylene terephthalamide in the spinning solution is 5-9:1-5.
9. The method of any of claims 4-7, wherein the sum of the mass of the polyaryl oxadiazole and the poly (paraphenylene terephthalamide) in the spinning solution is 5-12% of the mass of the spinning solution.
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| DE102016124608A1 (en) * | 2016-01-07 | 2017-07-13 | Coroplast Fritz Müller Gmbh & Co. Kg | High temperature and flame resistant colored adhesive tape, use of a carrier for its production and wiring harness with such an adhesive tape |
| CN106192551A (en) * | 2016-08-11 | 2016-12-07 | 江苏展宝新材料有限公司 | High-frequency circuit plate substrate prepared by a kind of poly-virtue diazole fibrous material |
| CN109468729A (en) * | 2018-12-29 | 2019-03-15 | 江苏宝德新材料有限公司 | A kind of blended fabric containing poly- fragrant oxadiazoles fiber |
| CN111424353A (en) * | 2020-02-24 | 2020-07-17 | 山东宏业纺织股份有限公司 | Flame-retardant sewing thread and production process thereof |
| CN112501949A (en) * | 2020-11-23 | 2021-03-16 | 江苏展宝新材料有限公司 | Polyaryloxadiazole fiber basalt composite material and preparation method thereof |
| CN113373544A (en) * | 2021-06-29 | 2021-09-10 | 宁夏泰和芳纶纤维有限责任公司 | High-elongation para-aramid fiber and preparation method thereof |
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