阅读说明：本技术 一种聚苯硫醚长丝制备的辅助装置及制备方法 (Auxiliary device for preparing polyphenylene sulfide filament and preparation method ) 是由 史贤宁 吴鹏飞 崔华帅 崔宁 李�杰 黄庆 杨雨强 张志全 王彦宁 付会娟 于 2021-05-28 设计创作，主要内容包括：本发明是一种聚苯硫醚长丝制备的辅助装置及制备方法,聚苯硫醚长丝制备方法为纺牵一步法,包括：聚苯硫醚树脂熔融挤出—纺丝成型—上油—过溶剂—牵伸—卷绕。聚苯硫醚长丝制备的辅助装置由溶剂喷淋/喷雾装置、丝束干燥除水装置和抽吸装置三部分组成；溶剂喷淋/喷雾装置由喷淋/喷雾器、喷淋/喷雾腔室、溶剂流出管组成；丝束干燥除水装置由干热空气输入管道、干热空气腔室、湿热空气抽吸管道组成；抽吸装置由气雾抽吸器和气雾抽吸管道组成。采用本发明制备的高强高模聚苯硫醚纤维制备的过滤毡、编织网材料,强度比常规材料可提高10-30％,在高温过滤领域应用可是过滤袋产品使用寿命提高5-20％。(The invention relates to an auxiliary device and a preparation method for polyphenylene sulfide filament preparation, wherein the preparation method for the polyphenylene sulfide filament is a spinning and drawing one-step method and comprises the following steps: polyphenylene sulfide resin melt extrusion, spinning forming, oiling, solvent passing, drafting and winding. The auxiliary device for preparing the polyphenylene sulfide filament consists of a solvent spraying/atomizing device, a tow drying and dewatering device and a suction device; the solvent spraying/atomizing device consists of a spraying/atomizing device, a spraying/atomizing chamber and a solvent outflow pipe; the tow drying and dewatering device consists of a dry hot air input pipeline, a dry hot air chamber and a wet hot air suction pipeline; the suction device consists of an aerosol aspirator and an aerosol suction pipeline. The strength of the filter felt and the woven mesh material prepared by the high-strength high-modulus polyphenylene sulfide fibers prepared by the method can be improved by 10-30% compared with that of the conventional material, and the service life of a filter bag product can be prolonged by 5-20% when the filter felt and the woven mesh material are applied to the field of high-temperature filtration.)

1. A preparation method of polyphenylene sulfide filament is characterized by comprising the following steps: introducing a solvent system when the polyphenylene sulfide nascent fiber is drafted to promote the orientation and crystallization of the polyphenylene sulfide fiber; the preparation method of the polyphenylene sulfide filament is a spinning and drawing one-step method, and comprises the following steps: polyphenylene sulfide resin melt extrusion, spinning forming, oiling, solvent passing, drafting and winding.

2. The method of claim 1, wherein the introduction of the solvent system is accomplished by adding an auxiliary device to the conventional spinning process.

3. The process of claim 1 wherein the tow is passed through the auxiliary means to introduce a solvent system into the tow, which is an aqueous solution of carbon tetrachloride; the concentration of the carbon tetrachloride solution is 10-100%.

4. Auxiliary equipment for carrying out the method according to claim 2, characterized in that the equipment consists of three parts, namely a solvent spraying/atomizing device, a tow drying and water removing device and a suction device; the solvent spraying/atomizing device consists of a spraying/atomizing device, a spraying/atomizing chamber and a solvent outflow pipe; the tow drying and dewatering device consists of a dry hot air input pipeline, a dry hot air chamber and a wet hot air suction pipeline; the suction device consists of an aerosol aspirator and an aerosol suction pipeline.

5. Auxiliary device according to claim 4, characterized in that the air pressure in the dry hot air chamber is 10-50Pa, preferably 20Pa, higher than the air pressure of the spraying/misting chamber and the ambient pressure outside the chamber; the air flow in the dry hot air input pipeline is less than or equal to the sum of the air flow of the wet hot air suction pipeline and the air flow of the front and the rear aerial fog suction devices.

6. An auxiliary device as claimed in claim 4, wherein the solvent system is introduced by solvent adhering to the tow as it passes through the auxiliary device during spinning, and by solvent showering or misting in a solvent shower/spray chamber of the auxiliary device; the tows containing the solvent enter a drying and dewatering device after passing through a solvent spraying/atomizing chamber, and the surface solvent contained in the tows is removed under the action of dry hot air flow.

7. Auxiliary device according to claim 6, characterized in that the temperature of the hot dry air is 30-70 ℃, preferably 40-60 ℃.

8. Auxiliary device according to claim 6, characterized in that after the introduction of the solvent and after the removal of the surface solvent, the solvent is added to the tow in an amount of 0.1-1% by weight, preferably 0.3-0.8% by weight, based on the weight of the tow.

9. The preparation method of claim 1, wherein the solvent-containing tows are subjected to drafting setting to obtain high-strength and high-modulus polyphenylene sulfide fibers; the drafting roller in the drafting process is arranged in a relative closed device with the suction function, the carbon tetrachloride is completely volatilized during the drafting and is taken away by the suction device for recycling, and the environmental pollution can not be caused.

10. The method of claim 1, wherein the polyphenylene sulfide filament has a breaking strength of 4.9-6.5cN/dtex, an initial modulus of 145-490 cN/dtex.

Technical Field

The invention relates to the technical field of high polymer materials, in particular to an auxiliary device for preparing a polyphenylene sulfide filament and a preparation method thereof.

Background

Polyphenylene Sulfide (PPS) fiber is an important variety of high-technology and high-performance fiber, is spun by high molecular weight polyphenylene sulfide, and has excellent chemical corrosion resistance (no solvent and solubility at 200 ℃), thermal stability for long-term use at 150-200 ℃, good mechanical property and excellent electrical insulation property. The PPS fiber has the chemical corrosion resistance second to that of polytetrafluoroethylene, has the limiting oxygen index of more than 33, and belongs to a non-combustible material with excellent performance; the fiber has excellent fatigue resistance and creep resistance, good dimensional stability, and almost unchanged dimension at high temperature and after moisture absorption.

Polyphenylene sulfide short fiber products have become the first choice filter material for flue gas bag type dust removal of coal-fired power plants. The PPS fiber has various excellent properties, so that the PPS fiber is continuously developed in use, and the needle felt made of the PPS fiber is used for a dryer in the paper industry and is an ideal heat-resistant and corrosion-resistant material; the needle-punched non-woven fabric or woven fabric can be used for manufacturing special paper in the electronic industry and used as a filter material of a heat-resistant corrosive reagent; the monofilament or multifilament fabric may also be used as a defogging material. In addition, PPS fiber products are also being used as a covering material and a dielectric material in the electronics industry and as a heat-resistant and flame-retardant material in the aerospace industry, and the worldwide demand for PPS fibers has increased year by year.

However, the existing PPS fiber is still low in strength and modulus, short in service life and high in use cost in the application of the filtration field. By improving the strength and modulus of the fiber, the strength and wear resistance of the product can be greatly improved, the service life is prolonged, and the application cost is reduced. At the same time, the relatively low strength and modulus do not meet the requirements of special fields such as: the application of military affairs, aviation and other fields with high requirements on strength and modulus performance limits the application and popularization of the polyphenylene sulfide fiber.

Disclosure of Invention

The invention aims to provide auxiliary equipment for preparing a high-strength and high-modulus polyphenylene sulfide fiber filament and a preparation method thereof.

The technical scheme of the invention is as follows:

a preparation method of a polyphenylene sulfide filament is characterized in that a solvent system is introduced when polyphenylene sulfide nascent fibers are drafted, so that the orientation and crystallization of the polyphenylene sulfide fibers are promoted; the preparation method of the polyphenylene sulfide filament is a spinning and drawing one-step method, and comprises the following steps: polyphenylene sulfide resin melt extrusion, spinning forming, oiling, solvent passing, drafting and winding.

In the preparation method, the introduction of the solvent system is realized by adding an auxiliary device in the conventional spinning process.

In the preparation method, the tows are introduced into a solvent system which is a carbon tetrachloride aqueous solution through the auxiliary device; the concentration of the carbon tetrachloride solution is 10-100%.

The auxiliary device of the polyphenylene sulfide filament consists of a solvent spraying/atomizing device, a tow drying and dewatering device and a suction device; the solvent spraying/atomizing device consists of a spraying/atomizing device, a spraying/atomizing chamber and a solvent outflow pipe; the tow drying and dewatering device consists of a dry hot air input pipeline, a dry hot air chamber and a wet hot air suction pipeline; the suction device consists of an aerosol aspirator and an aerosol suction pipeline.

The air pressure in the dry hot air chamber of the auxiliary device is 10-50Pa, preferably 20Pa higher than the air pressure of the spraying/atomizing chamber and the outdoor normal pressure; the air flow in the dry hot air input pipeline is less than or equal to the sum of the air flow of the wet hot air suction pipeline and the air flow of the front and the rear aerial fog suction devices.

The auxiliary device is characterized in that in the process of introducing the solvent system, when the tows pass through the auxiliary device in the spinning process and the solvent passes through the solvent spraying/atomizing chamber of the auxiliary device to spray liquid or gas mist, the solvent is attached to the tows; the tows containing the solvent enter a drying and dewatering device after passing through a solvent spraying/atomizing chamber, and the surface solvent contained in the tows is removed under the action of dry hot air flow.

The temperature of the hot dry air in the auxiliary device is 30-70 ℃, and the temperature of the hot dry air is preferably 40-60 ℃.

In the auxiliary device, after the solvent is introduced and the surface solvent is removed, the addition amount of the solvent in the tows is 0.1-1% by weight of the tows, and preferably 0.3-0.8% by weight of the tows.

The high-strength and high-modulus polyphenylene sulfide fiber is obtained after the tows of the solvent are drafted and shaped; the drafting roller in the drafting process is arranged in a relative closed device with the suction function, the carbon tetrachloride is completely volatilized during the drafting and is taken away by the suction device for recycling, and the environmental pollution can not be caused.

The breaking strength of the polyphenylene sulfide filament prepared by the invention is 4.9-6.5cN/dtex, and the initial modulus is 145-490 cN/dtex.

The concrete description is as follows:

the installation position of the auxiliary device for preparing the polyphenylene sulfide filament is shown in figure 2, the structure of the auxiliary device is shown in figure 1 between a 16 godet and an 18 drafting system in the polyphenylene sulfide fiber preparation process, the device is integrally packaged in a cuboid box, and only one through hole is reserved for the inlet and outlet of a tow; the device consists of a solvent spraying device, a tow drying and dewatering device and a suction device; the solvent spraying/atomizing device consists of a spraying/atomizing device 2 positioned at the top, a middle spraying/atomizing chamber 1 and a bottom solvent outflow pipe 3; the tow drying and dewatering device consists of a dry hot air input pipeline 5 positioned at the bottom, a dry hot air chamber 4 in the middle and a wet hot air suction pipeline 6 positioned at the top; the suction device consists of an aerosol suction device 7 and an aerosol suction pipeline 8, the suction device is arranged at the inlet and outlet positions of tows at two ends of the integrally packaged rectangular auxiliary device, and the aerosol suction device 7 completely covers the inlet and outlet positions; the solvent spraying/atomizing device and the tow drying device are arranged in a cuboid closed box in parallel according to the tow inlet and outlet sequence, the tows sequentially pass through the suction device, the solvent spraying/atomizing device, the drying and dewatering device and the suction device through the inlet, and the overall structure sectional view is shown in figure 1.

The auxiliary device for preparing the polyphenylene sulfide fiber has the main function of introducing a carbon tetrachloride solvent into the nascent fiber before the polyphenylene sulfide fiber is drafted, so that in the drafting process of the polyphenylene sulfide fiber, under the combined action of the drafting temperature and the solvent induced crystal phase, the crystallization and orientation of a macromolecular chain segment in the polyphenylene sulfide fiber are promoted, the fiber performance is improved, and the high-strength and high-modulus polyphenylene sulfide fiber filament is further obtained. The main mechanisms of the solvent induced crystallization are: the solvent enters the high polymer molecular chain segments through diffusion, the force among the high polymer chain segments is damaged, the mobility of the polymer chain segments is improved, the polymer macromolecules are rearranged, and the form with lower thermodynamic energy, namely crystal orientation and the like, is obtained. The process is mainly realized by the auxiliary device.

The preparation process of the high-strength and high-modulus polyphenylene sulfide fiber comprises the steps of feeding polyphenylene sulfide resin into a screw extruder 11 through a raw material inlet 10, carrying out melt extrusion, then quantitatively outputting the molten polyphenylene sulfide resin into a spinning box 13 through a metering pump 12, extruding the molten polyphenylene sulfide resin into a spinneret plate in the spinning box 13 to form a polyphenylene sulfide filament 9 filament bundle, oiling the cooled and solidified filament bundle through an oil nozzle 15 under the action of a side blowing air 14, turning the filament bundle to enter an auxiliary device 17 for preparing the polyphenylene sulfide filament after a godet 16 turns, feeding carbon tetrachloride into the fiber through the carbon tetrachloride solution in the auxiliary device 17 for preparing the polyphenylene sulfide filament, then feeding the filament bundle into a drafting system 18, and completing crystallization and orientation of a macromolecular chain segment under the combined action of temperature, tension and solvent induced crystallization to form the high-strength and high-modulus polyphenylene sulfide fiber, The high-modulus polyphenylene sulfide fiber is then fed into a winder 20 through a guide disc 19 to form a finished polyphenylene sulfide fiber product.

In the process, the temperature in the screw extruder is 315-325 ℃; the drafting multiple is 3.5-5.1 times; the winding speed of the winder is 2200-4500 m/min.

In the above process, when the auxiliary device is used, the air pressure in the dry hot air chamber is 10-50Pa, preferably 20Pa higher than the air pressure of the spraying/atomizing chamber and the outdoor normal pressure. The air flow in the dry hot air input pipeline is less than or equal to the sum of the air flow of the wet hot air suction pipeline and the air flow of the front and the rear aerial fog suction devices.

In the auxiliary device shown in fig. 1, a carbon tetrachloride solvent is filled in a solvent spray/mist chamber 1 in the form of a liquid flow or a vapor mist by a solvent spray/mist sprayer 2, and when the filament bundle passes through the solvent spray/mist chamber, the carbon tetrachloride solvent enters the filament bundle and permeates into the polyphenylene sulfide fibers. The tow containing the solvent then enters the hot dry air chamber 4 where the surface solvent contained in the tow is removed by the flow of hot dry air from the hot dry air inlet duct 5. The damp and hot air containing the solvent and the solvent vapor fog are pumped away by a damp and hot air suction pipeline 6 and an air fog suction device 7, and enter a carbon tetrachloride solvent recovery device together with the solution in the solvent spraying/atomizing chamber 1 after flowing out through a solvent outflow pipe 3 for recycling.

The temperature of the dry hot air input by the dry hot air input pipeline 5 is 30-70 ℃, and the preferred temperature of the dry hot air is 40-60 ℃. The internal temperature of the dry hot air chamber is 30-60 ℃ and is used for promoting the volatilization of the solvent on the surface of the tows.

The tow emerges from the auxiliary device 17 for the production of polyphenylene sulfide filaments in FIG. 2, the solvent content being 0.1 to 1% by weight, preferably 0.3 to 0.8% by weight, based on the weight of the tow.

The invention utilizes the principle of solvent induced orientation, introduces an auxiliary device in the preparation process of the polyphenylene sulfide fiber, and realizes the introduction of the solvent for induced orientation in the preparation of the polyphenylene sulfide filament fiber, so that the polyphenylene sulfide macromolecular chain segment is easier to orient and crystallize, the breaking strength and the modulus of the fiber are further improved, and the high-performance polyphenylene sulfide fiber filament is obtained. The prepared high-strength high-modulus PPS fiber has high crystallinity and good thermal stability, so that the strength of the filter felt and the woven mesh material prepared from the high-strength high-modulus polyphenylene sulfide fiber prepared by the method can be improved by 10-30% compared with that of the conventional material, the service life of a filter bag product can be prolonged by 5-20% when the high-strength high-modulus PPS fiber is applied to the field of high-temperature filtration, the replacement period is prolonged, and the use cost is reduced. The prepared products such as the filter felt, the filter bag and the like have better temperature resistance and impact resistance, the service life of the products can be effectively prolonged, the replacement frequency of the products used in papermaking, coal-fired power plants and the like is reduced, and the production cost is saved. Meanwhile, the high-strength and high-modulus polyphenylene sulfide fiber product has better application prospect in the fields of aviation, electronics, chemical industry and the like. The method has simple and easy process route, small change to the existing production system and better market value.

Description of the drawings:

FIG. 1: schematic diagram of auxiliary equipment

FIG. 2: the polyphenylene sulfide filament preparation flow chart comprises the following steps: 1-solvent spray/mist chamber; 2-solvent spray/sprayer; 3-a solvent outflow tube; 4-dry hot air chamber; 5-dry hot air input pipeline; 6-hot humid air suction duct; 7-aerosol aspirator; 8-a pipeline; 9-polyphenylene sulfide filament tow; 10-a raw material inlet; 11-screw extruder; 12-a metering pump; 13-spinning manifold; 14-cross air blowing; 15-oil nozzle; 16-a steering guide disc; 17-auxiliary device for preparing polyphenylene sulfide filament; 18-a drafting device; 19-a guide disc; 20-winding machine

The specific implementation mode is as follows:

the present invention will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples, and the present invention is not limited to these examples in any way.

The preparation process of the high-strength and high-modulus polyphenylene sulfide fiber comprises the steps of feeding polyphenylene sulfide resin into a screw extruder 11 through a raw material inlet 10, carrying out melt extrusion, then quantitatively outputting the molten polyphenylene sulfide resin into a spinning box 13 through a metering pump 12, extruding the molten polyphenylene sulfide resin into a spinneret plate in the spinning box 13 to form a polyphenylene sulfide filament 9 filament bundle, oiling the cooled and solidified filament bundle through an oil nozzle 15 under the action of a side blowing air 14, turning the filament bundle to enter an auxiliary device 17 for preparing the polyphenylene sulfide filament after a godet 16 turns, feeding carbon tetrachloride into the fiber through the carbon tetrachloride solution in the auxiliary device 17 for preparing the polyphenylene sulfide filament, then feeding the filament bundle into a drafting system 18, and completing crystallization and orientation of a macromolecular chain segment under the combined action of temperature, tension and solvent induced crystallization to form the high-strength and high-modulus polyphenylene sulfide fiber, The high-modulus polyphenylene sulfide fiber is then fed into a winder 20 through a guide disc 19 to form a finished polyphenylene sulfide fiber product. In the above process, when the auxiliary device is used, the air pressure in the dry hot air chamber is 10-50Pa, preferably 20Pa higher than the air pressure of the spraying/atomizing chamber and the outdoor normal pressure. The air flow in the dry hot air input pipeline is less than or equal to the sum of the air flow of the wet hot air suction pipeline and the air flow of the front and the rear aerial fog suction devices.

The temperature of the dry hot air input by the dry hot air input pipeline 5 is 30-70 ℃, and the preferred temperature of the dry hot air is 40-60 ℃. The internal temperature of the dry hot air chamber is 30-60 ℃ and is used for promoting the volatilization of the solvent on the surface of the tows. The tow emerges from the auxiliary device 17 for the production of polyphenylene sulfide filaments in FIG. 2, the solvent content being 0.1 to 1% by weight, preferably 0.3 to 0.8% by weight, based on the weight of the tow.

Example 1 after the polyphenylene sulfide resin is dried, it enters a screw extruder 11 through a raw material inlet 10, after melt extrusion at 315 ℃, it quantitatively enters a spinning manifold 13 after being metered by a metering pump 12, it is extruded through a spinneret to form a polyphenylene sulfide filament tow 9 in the spinning manifold 13, the tow formed by cooling and solidifying under the blowing action of a side blow 14 passes through an oiling nozzle 15 and a godet 16 and then enters an auxiliary device 17 for preparing polyphenylene sulfide filaments, after passing through a vapor fog of a carbon tetrachloride aqueous solution with a concentration of 10% in the auxiliary device, the tow contains about 0.4% of carbon tetrachloride, then the tow enters a drying and dewatering device of the auxiliary device, dry and hot air with a temperature of 30 ℃ is sent through a dry and hot air input pipe, the solvent on the surface of the tow is dried in a dry and hot air chamber with a relative pressure of 10Pa and a temperature of 30 ℃, a part of the evaporated solvent is located at the top of the auxiliary device and is pumped away through a wet and hot air suction pipe, the residual part is sucked away along with the tows when the tows pass through the aerosol suction device to finish the removal of the solvent on the surfaces of the tows, and the solvent content in the tows is about 0.1 percent; and then the filament bundle enters a drafting system 18, passes through a guide disc 19 after being drafted by 3.5 times, enters a winding machine 20, and is wound at the winding speed of 2200m/min to obtain the polyphenylene sulfide filament. Through the process, the breaking strength of the fiber reaches 4.9cN/dtex, and the initial modulus reaches 145 cN/dtex.

Example 2 after the polyphenylene sulfide resin is dried, it enters a screw extruder 11 through a raw material inlet 10, after melt extrusion at 315 ℃, it quantitatively enters a spinning manifold 13 after being metered by a metering pump 12, it is extruded through a spinneret to form a polyphenylene sulfide filament tow 9 in the spinning manifold 13, the tow formed by cooling and solidifying under the blowing action of a side blow 14 passes through an oiling nozzle 15 and a godet 16 and then enters an auxiliary device 17 for preparing polyphenylene sulfide filament, after passing through a vapor fog of carbon tetrachloride aqueous solution with a concentration of 30% in the auxiliary device, the tow contains about 0.6% of carbon tetrachloride, then the tow enters a drying and dewatering device of the auxiliary device, dry and hot air with a temperature of 40 ℃ is sent through a dry and hot air input pipe, the solvent on the surface of the tow is dried in a dry and hot air chamber with a relative pressure of 20Pa and a temperature of 30 ℃, a part of the evaporated solvent is located at the top of the auxiliary device and is pumped away through a wet and hot air suction pipe, the residual part is sucked away along with the tows when the tows pass through the aerosol suction device to finish the removal of the solvent on the surfaces of the tows, and the solvent content in the tows is about 0.3 percent; and then the filament bundle enters a drafting system 18, passes through a guide disc 19 after being drafted by 3.5 times, enters a winding machine 20, and is wound at the winding speed of 2200m/min to obtain the polyphenylene sulfide filament. Through the process, the breaking strength of the fiber reaches 5.1cN/dtex, and the initial modulus reaches 175 cN/dtex.

Example 3 after the polyphenylene sulfide resin is dried, it enters a screw extruder 11 through a raw material inlet 10, after melt extrusion at 321 ℃, it quantitatively enters a spinning manifold 13 after being metered by a metering pump 12, it is extruded through a spinneret to form a polyphenylene sulfide filament tow 9 in the spinning manifold 13, the tow formed by cooling and solidifying under the blowing action of a side blow 14 passes through an oiling nozzle 15 and a godet 16 and then enters an auxiliary device 17 for preparing polyphenylene sulfide filaments, after the carbon tetrachloride aqueous solution with the concentration of 40% passes through the auxiliary device, the tow contains about 1.0% of carbon tetrachloride, then the tow enters a drying and dewatering device of the auxiliary device, a dry and hot air with the temperature of 70 ℃ is sent through an air input pipe, the solvent on the surface of the tow is dried in a dry and hot air chamber with the relative pressure of 50Pa and the temperature of 60 ℃, a part of the evaporated solvent is located at the top of the auxiliary device and is pumped out through a wet and hot air suction pipeline, the residual part is sucked away along with the tows when the tows pass through the aerosol suction device to finish the removal of the solvent on the surfaces of the tows, and the solvent content in the tows is about 0.5 percent; and then the filament bundle enters a drafting system 18, passes through a guide disc 19 after being drafted by 5.1 times, enters a winding machine 20, and is wound at the winding speed of 4500m/min to obtain the polyphenylene sulfide filament. Through the process, the breaking strength of the fiber reaches 5.5cN/dtex, and the initial modulus is 380 cN/dtex.

Example 4 after the polyphenylene sulfide resin was dried, it entered screw extruder 11 through raw material inlet 10, after melt extrusion at 321 ℃, it quantitatively entered spinning beam 13 after metering by metering pump 12, extruded by spinneret to form polyphenylene sulfide filament tow 9 in spinning beam 13, after the tow formed by cooling and solidifying under the blowing action of cross blow 14 passed through oiling nozzle 15 and godet 16, entered auxiliary device 17 for polyphenylene sulfide filament preparation, after carbon tetrachloride aqueous solution with concentration of 60% passed through spraying in auxiliary device, the tow approximately contained 0.9% carbon tetrachloride, then the tow entered drying and dewatering device of auxiliary device, had air input pipe fed dry hot air with temperature of 50 ℃, dried the solvent on the tow surface in dry hot air chamber with relative pressure of 20Pa and temperature of 50 ℃, part of the evaporated solvent located at the top of auxiliary device, pumped out by wet hot air suction pipe, the residual part is sucked away along with the tows when the tows pass through the aerosol suction device to finish the removal of the solvent on the surfaces of the tows, and the solvent content in the tows is about 0.6 percent; and then the filament bundle enters a drafting system 18, passes through a guide disc 19 after being drafted by 5.1 times, enters a winding machine 20, and is wound at the winding speed of 4500m/min to obtain the polyphenylene sulfide filament. Through the process, the breaking strength of the fiber reaches 6.5cN/dtex, and the initial modulus is 490 cN/dtex.

Example 5 after the polyphenylene sulfide resin was dried, it entered screw extruder 11 through raw material inlet 10, after melt extrusion at 325 ℃, it quantitatively entered spinning beam 13 after metering by metering pump 12, extruded by spinneret in spinning beam 13 to form polyphenylene sulfide filament tow 9, after cooling and solidifying the formed tow under the blowing action of cross blow 14, oil was applied through finish nozzle 15 and godet 16, it entered auxiliary device 17 for polyphenylene sulfide filament preparation, after passing through spraying of carbon tetrachloride aqueous solution with concentration of 100% in auxiliary device, the tow approximately contained 1.2% carbon tetrachloride, then the tow entered drying and water removing device of auxiliary device, had air input pipe fed dry hot air with temperature of 60 ℃, dried solvent on tow surface in dry hot air chamber with relative pressure of 20Pa and temperature of 52 ℃, part of the evaporated solvent located at the top of auxiliary device, wet hot air suction pipe was extracted, the residual part is sucked away along with the tows when the tows pass through the aerosol suction device to finish the removal of the solvent on the surfaces of the tows, and the solvent content in the tows is about 0.8 percent; and then the filament bundle enters a drafting system 18, passes through a guide disc 19 after being drafted by 4.5 times, enters a winding machine 20, and is wound at the winding speed of 3600m/min to obtain the polyphenylene sulfide filament. Through the process, the breaking strength of the fiber reaches 5.9cN/dtex, and the initial modulus reaches 467 cN/dtex.

The strength of the filter felt and the woven mesh material prepared by the high-strength high-modulus polyphenylene sulfide fibers prepared by the method can be improved by 10-30% compared with that of the conventional material, the service life of a filter bag product can be prolonged by 5-20% when the filter felt and the woven mesh material are applied to the field of high-temperature filtration, the replacement period is prolonged, and the use cost is reduced.

While the methods and techniques of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and/or modifications of the methods and techniques described herein may be made without departing from the spirit and scope of the invention. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention.