A high-temperature-resistant and corrosion-resistant high-strength fiber and its preparation method and application

Abstract

The present invention relates to a high-temperature resistant and corrosion-resistant high-strength fiber and its preparation method and application, and belongs to the field of preparation of polymer composite fiber materials. The high-temperature resistant and corrosion-resistant high-strength fiber components provided by the present invention mainly include the following components: POK resin, PE resin, toughening agent, compatibilizer, antioxidant and lubricant. The production steps of high-temperature resistant and corrosion-resistant high-strength fibers include special material preparation, melt spinning, high-multiple stretching and filament winding, etc. The main material of the high-temperature resistant and corrosion-resistant high-strength fiber product provided by the present invention is based on POK / PE composite material. The fiber has extremely high tensile strength and corrosion resistance. At the same time, the POK material has excellent temperature resistance. The obtained product can be widely used in the preparation of filter screens required in high-temperature environments containing corrosive media such as petrochemicals. At the same time, the cost of PE is only one-fourth of that of POK. The product as a whole realizes the low-cost application of POK, further broadens the application of POK, and has a relatively broad market prospect.

Description

Technical Field

[0001] The present invention relates to the field of preparation of polymer composite fiber materials, and in particular to a high-temperature resistant and corrosion-resistant high-strength fiber and a preparation method and application thereof. Background Art

[0002] POK is a new, highly crystalline polymer derived from the copolymerization of carbon monoxide and olefins (ethylene and propylene) in air. It exhibits high strength, high temperature resistance, high wear resistance, and resistance to moderate acids and alkalis. POK material boasts excellent heat and corrosion resistance, with a Vicat softening temperature (B50 method) reaching 190°C. It also possesses extremely high tensile strength, making it an excellent substrate for filtering high-temperature, corrosive media. Filter screens made from POK fibers are highly resistant to high temperatures and high corrosion environments. Currently, most filter screens used in oil and gas fields or the chemical industry are made of steel, which is highly susceptible to corrosion and has a short lifespan, increasing the cost of subsequent impurity removal and purification of the media. However, the current market price of POK is 25,000-30,000 yuan per ton. This high price has limited its widespread application. The development of a low-cost material with high strength, high temperature resistance, high wear resistance, and corrosion resistance for corrosive media filters has become a research priority in this field.

[0003] PE material, density is generally 0.7-1g / cm 3 The raw material price is only one-fourth of that of POK, making it an ideal raw material for blending with POK to produce high-temperature, corrosion-resistant, and high-strength fibers for corrosive media filters. Therefore, exploring low-cost fibers with high-temperature, corrosion-resistant, and high-strength properties is crucial for the production of corrosive media filters. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art by providing a high-strength, high-temperature, and corrosion-resistant fiber, its preparation method, and its application. The present fiber is made from a POK / PE composite material and can be used in corrosive media filter screens. This invention effectively addresses the corrosion resistance and short lifespan of current steel filter screens, while also overcoming the high cost of POK materials.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the technical solutions of the present invention is to provide a high-temperature resistant and corrosion-resistant high-strength fiber, which comprises the following components: POK resin, PE resin, toughening agent, compatibilizer, antioxidant and lubricant, wherein the weight proportions of the components are: POK resin: 5-95 parts; PE resin: 5-95 parts; toughening agent 0-5 parts, not 0; compatibilizer: 0-4 parts, not 0; antioxidant: 0-1.2 parts, not 0; lubricant: 0-3 parts, not 0.

[0007] In one embodiment of the present invention, the POK resin has a number average molecular weight range of 40,000-120,000 and a melt index of 1-8 g / 10 min at 240°C / 2.16 kg, or one or more combinations thereof. Preferably, the selected POK resin has a number average molecular weight of 60,000 and a melt index of 4 g / 10 min.

[0008] In one embodiment of the present invention, the PE resin is ultra-high molecular weight polyethylene, high-density polyethylene, medium-density polyethylene, low-density polyethylene or linear low-density polyethylene, and has a melt index of 1-8 g / 10 min or more at 190°C / 2.16 kg. Preferably, the selected PE resin is high-density polyethylene with a melt index of 4 g / 10 min.

[0009] In one embodiment of the present invention, the toughening agent can be one or more of methyl methacrylate-butadiene-styrene copolymer, maleic anhydride grafted ethylene-vinyl acetate copolymer, and maleic anhydride grafted polyethylene octene co-elastomer. Preferably, the toughening agent selected is maleic anhydride grafted polyethylene octene co-elastomer.

[0010] In one embodiment of the present invention, the compatibilizer may be one or more of maleic anhydride grafted POK or maleic anhydride grafted PE. Preferably, maleic anhydride grafted PE is selected.

[0011] In one embodiment of the present invention, the antioxidant is selected from one or more of antioxidant 2450, antioxidant 1076, antioxidant 1010 or antioxidant 168. Preferably, the antioxidant selected is antioxidant 1010 or antioxidant 168.

[0012] In one embodiment of the present invention, the lubricant is selected from at least one or more of zinc stearate, calcium stearate, butyl stearate, oleamide, pentaerythritol stearate or ethylene bisstearamide. Preferably, the lubricant is zinc stearate.

[0013] The second technical solution of the present invention is to provide a method for preparing the high-temperature resistant and corrosion-resistant high-strength fiber, which comprises the following specific steps:

[0014] (1) Adding an appropriate amount of white oil to the raw materials POK resin, PE resin, compatibilizer, toughening agent, antioxidant and lubricant, the amount of white oil added is sufficient to allow the various components to be mixed, mixing at 90°C for 15 minutes, and then melt blending the mixture. After mixing and stirring at room temperature, add it to an extruder and dry it in a 90°C oven for 2 hours to make the matrix resin POK and PE fully compatible and combined under the action of the compatibilizer to obtain a special material for high-temperature corrosion-resistant high-strength fibers;

[0015] (2) The high-temperature corrosion-resistant high-strength fiber special material after melt mixing in step (1) is extruded through an extruder and a metering pump at equal constant pressure, uniformly extruded through a spinneret, and enters a cooling water tank to complete the shaping of the silk embryo to obtain a silk embryo;

[0016] (3) The silk blank obtained in step (2) is passed through a first set of drafting rollers and then into a preheated water tank at a temperature of 40-100°C, and then passed through a second set of drafting rollers to complete the first stretching, ensuring that the roller surface linear speed ratio of the second set of drafting rollers and the first set of drafting rollers is controlled at 2-6 times;

[0017] (4) feeding the fiber that has completed the primary stretching in step (3) into a constant temperature hot air box at a temperature of 110-170°C, and then completing the secondary stretching through a third set of drafting rollers, while maintaining the ratio of the surface linear speed of the third set of drafting rollers and the second set of drafting rollers at 3-4 times;

[0018] (5) Separating and winding the filament bundles after being drawn by the third set of drawing rollers to prepare the high-temperature resistant and corrosion-resistant high-strength fibers.

[0019] In one embodiment of the present invention, the processing equipment for melt blending the mixture in step (1) can be an internal mixer, a single-screw extruder, a twin-screw extruder or an open mixer, preferably a twin-screw extruder, and the processing temperature range of the twin-screw extruder is 180-260°C, and the main engine speed is 200-600rpm.

[0020] In one embodiment of the present invention, the extruder used for the high-temperature corrosion-resistant high-strength fiber special material after melt mixing in step (2) can be a single-screw extruder, a twin-screw extruder or an open mill, preferably a single-screw extruder, and the processing temperature range of the single-screw extruder is 200-260°C, and the main engine speed is 200-600rpm.

[0021] In one embodiment of the present invention, the metering pump pressure used in step (2) is 4-15 MPa.

[0022] In one embodiment of the present invention, the pore size of the spinneret used in step (2) is any pore size in the range of 4-15 mm.

[0023] In one embodiment of the present invention, the number of combined drafting rollers in step (3) and step (4) is any number from 1 to 7.

[0024] In one embodiment of the present invention, the linear density of the high-temperature resistant and corrosion-resistant high-strength fiber obtained in step (5) is 450tex.

[0025] The present invention further provides an application of the high-temperature-resistant, corrosion-resistant, high-strength fiber, wherein the high-temperature-resistant, corrosion-resistant, high-strength fiber is used to prepare a filter that can be used for corrosive media.

[0026] Compared with the prior art, the high-temperature-resistant, corrosion-resistant, and high-strength fiber provided by the present invention introduces a low-cost PE material into the POK material, and has the high-temperature resistance, corrosion resistance, and high tensile strength characteristics of POK. At the same time, when preparing the high-temperature-resistant, corrosion-resistant, and high-strength fiber of the present invention, the proportion of the expensive POK resin added is only 20%, and the selling price of PE resin is only one-fifth of that of POK, and the comprehensive cost of raw materials can be reduced by 15%. The fiber that has undergone secondary stretching has a lower linear density, which can meet the needs of filter screen production and ensure the mesh number and various performance properties of the filter screen. The high-temperature-resistant, corrosion-resistant, and high-strength fiber provided by the present invention has been toughened to ensure that the radial toughness caused by linear high-ratio stretching after the fiber is produced decreases, thereby reducing the bending brittleness of the filter screen. The preparation method of the special material for high-temperature-resistant, corrosion-resistant, and high-strength fibers with capacity expansion treatment is simple, requires only conventional melt mixing equipment, and has extremely high prospects for scaled-up production. DETAILED DESCRIPTION

[0027] In order to better describe the preparation scheme of the present invention and the performance advantages and economic benefits of the invented products, the present invention is described in detail below with reference to specific embodiments. For details not specifically noted, the operation is carried out in accordance with the general guidance of the manufacturer.

[0028] The POK resin used in the embodiment of the present invention is POK-M630A produced by Hyosung of South Korea. The PE resin used is HDPE HMN 5445 Saudi Sabic. The toughening agent used is maleic anhydride grafted polyethylene octene co-elastomer, specifically brand KT-906, produced by Shenyang Ketong. The compatibilizer used is poly PE grafted maleic anhydride, brand KT-12, produced by Shenyang Ketong. The antioxidant used is a combination of antioxidant 1010 and antioxidant 168, with a mass ratio of 1:1. The twin-screw extruder used is model SHJR-36, produced by Nanjing Kangfa. The universal testing machine used to test the tensile strength of the fiber is model WQ-700, produced by Yangzhou Saisi.

[0029] Example 1

[0030] This embodiment provides a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter screen, and a preparation method thereof includes:

[0031] (1) Preparation of high-temperature and corrosion-resistant high-strength fiber special materials for corrosive medium filter screens

[0032] First, POK, PE, maleic anhydride grafted polyethylene octene co-elastomer, PE grafted maleic anhydride, antioxidant 1010, antioxidant 168 and zinc stearate were dried in a vacuum oven at 80°C for 4 hours, and then mixed and stirred at room temperature according to the mass ratio of POK: PE: maleic anhydride grafted polyethylene octene co-elastomer: PE grafted maleic anhydride: antioxidant 1010-168: zinc stearate = 95:5:3:1.2:0.6:0.2, and then added to a twin-screw extruder. The processing temperature range of the twin-screw extruder is 180-240°C, and the specific temperature setting is:

[0033]

[0034]

[0035] The main machine rotates at 300 rpm. The pellets obtained by strand pelletizing are dried in an oven at 90°C for 2 hours.

[0036] Next, the melt-mixed, high-temperature corrosion-resistant, high-strength fiber material for the corrosive medium filter is extruded through a single-screw extruder and metering pump at constant pressure. The material is evenly extruded through a spinneret with a 7mm aperture and then enters a cooling water tank to complete the shaping of the fiber embryo. The barrel temperature of the single-screw extruder is set at 200-260°C, the main engine speed is 400rpm, and the metering pump pressure is set at 11.5MPa.

[0037] Finally, the obtained silk embryo is sent into the preheated water tank through the first set of drafting rollers and then into the second set of drafting rollers to complete the first stretching. Then, it is sent into the constant temperature hot air box through the second set of drafting rollers and then into the third set of drafting rollers to complete the secondary stretching. Finally, it is sent into the wire separation and winding equipment by the third set of drafting rollers to complete the collection, and then the fiber with a linear density of 450tex is prepared. The linear speed of the drafting roller and the water tank temperature are set as follows.

[0038]

[0039] Example 2

[0040] This embodiment provides a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter screen, and a preparation method thereof includes:

[0041] (1) Preparation of high-temperature and corrosion-resistant high-strength fiber special materials for corrosive medium filter screens

[0042] First, POK, PE, maleic anhydride grafted polyethylene octene co-elastomer, PE grafted maleic anhydride, antioxidant 1010, antioxidant 168 and zinc stearate were dried in a vacuum oven at 80°C for 4 hours, and then mixed and stirred at room temperature according to the mass ratio of POK: PE: maleic anhydride grafted polyethylene octene co-elastomer: PE grafted maleic anhydride: antioxidant 1010-168: zinc stearate = 85:15:3:1.2:0.6:0.2, and then added to a twin-screw extruder. The processing temperature range of the twin-screw extruder is 180-240°C, and the specific temperature setting is:

[0043]

[0044]

[0045] The main machine rotates at 300 rpm. The pellets obtained by strand pelletizing are dried in an oven at 90°C for 2 hours.

[0046] Next, the melt-mixed, high-temperature corrosion-resistant, high-strength fiber material for the corrosive medium filter is extruded through a single-screw extruder and metering pump at constant pressure. The material is evenly extruded through a spinneret with a 7mm aperture and then enters a cooling water tank to complete the shaping of the fiber embryo. The barrel temperature of the single-screw extruder is set at 200-260°C, the main engine speed is 400rpm, and the metering pump pressure is set at 11.5MPa.

[0047] Finally, the obtained silk embryo is sent into the preheated water tank through the first set of drafting rollers and then into the second set of drafting rollers to complete the first stretching. Then, it is sent into the constant temperature hot air box through the second set of drafting rollers and then into the third set of drafting rollers to complete the secondary stretching. Finally, it is sent into the wire separation and winding equipment by the third set of drafting rollers to complete the collection, and then the fiber with a linear density of 450tex is prepared. The linear speed of the drafting roller and the water tank temperature are set as follows.

[0048]

[0049] Example 3

[0050] This embodiment provides a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter screen, and a preparation method thereof includes:

[0051] (1) Preparation of high-temperature and corrosion-resistant high-strength fiber special materials for corrosive medium filter screens

[0052] First, POK, PE, maleic anhydride grafted polyethylene octene co-elastomer, PE grafted maleic anhydride, antioxidant 1010, antioxidant 168 and zinc stearate were dried in a vacuum oven at 80°C for 4 hours, and then mixed and stirred at room temperature according to the mass ratio of POK: PE: maleic anhydride grafted polyethylene octene co-elastomer: PE grafted maleic anhydride: antioxidant 1010-168: zinc stearate = 75:25:3:1.2:0.6:0.2, and then added to a twin-screw extruder. The processing temperature range of the twin-screw extruder is 180-240°C, and the specific temperature setting is:

[0053]

[0054]

[0055] The main machine rotates at 300 rpm. The pellets obtained by strand pelletizing are dried in an oven at 90°C for 2 hours.

[0056] Next, the melt-mixed, high-temperature corrosion-resistant, high-strength fiber material for the corrosive medium filter is extruded through a single-screw extruder and metering pump at constant pressure. The material is evenly extruded through a spinneret with a 7mm aperture and then enters a cooling water tank to complete the shaping of the fiber embryo. The barrel temperature of the single-screw extruder is set at 200-260°C, the main engine speed is 400rpm, and the metering pump pressure is set at 11.5MPa.

[0057] Finally, the obtained silk embryo is sent into the preheated water tank through the first set of drafting rollers and then into the second set of drafting rollers to complete the first stretching. Then, it is sent into the constant temperature hot air box through the second set of drafting rollers and then into the third set of drafting rollers to complete the secondary stretching. Finally, it is sent into the wire separation and winding equipment by the third set of drafting rollers to complete the collection, and then the fiber with a linear density of 450tex is prepared. The linear speed of the drafting roller and the water tank temperature are set as follows.

[0058]

[0059] Example 4

[0060] This embodiment provides a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter screen, and a preparation method thereof includes:

[0061] (1) Preparation of high-temperature and corrosion-resistant high-strength fiber special materials for corrosive medium filter screens

[0062] First, POK, PE, maleic anhydride grafted polyethylene octene co-elastomer, PE grafted maleic anhydride, antioxidant 1010, antioxidant 168 and zinc stearate were dried in a vacuum oven at 80°C for 4 hours, and then mixed and stirred at room temperature according to the mass ratio of POK: PE: maleic anhydride grafted polyethylene octene co-elastomer: PE grafted maleic anhydride: antioxidant 1010-168: zinc stearate = 85:15:3:1.2:0.6:0.2, and then added to a twin-screw extruder. The processing temperature range of the twin-screw extruder is 180-240°C, and the specific temperature setting is:

[0063]

[0064] The main machine rotates at 300 rpm. The pellets obtained by strand pelletizing are dried in an oven at 90°C for 2 hours.

[0065] Next, the melt-mixed, high-temperature corrosion-resistant, high-strength fiber material for the corrosive medium filter is extruded through a single-screw extruder and metering pump at constant pressure. The material is evenly extruded through a spinneret with a 7mm aperture and then enters a cooling water tank to complete the shaping of the fiber embryo. The barrel temperature of the single-screw extruder is set at 200-260°C, the main engine speed is 400rpm, and the metering pump pressure is set at 11.5MPa.

[0066] Finally, the obtained silk embryo is sent into the preheated water tank through the first set of drafting rollers and then into the second set of drafting rollers to complete the first stretching. Then, it is sent into the constant temperature hot air box through the second set of drafting rollers and then into the third set of drafting rollers to complete the secondary stretching. Finally, it is sent into the wire separation and winding equipment by the third set of drafting rollers to complete the collection, and then the fiber with a linear density of 450tex is prepared. The linear speed of the drafting roller and the water tank temperature are set as follows.

[0067]

[0068] Example 5

[0069] This embodiment provides a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter screen, and a preparation method thereof includes:

[0070] (1) Preparation of high-temperature and corrosion-resistant high-strength fiber special materials for corrosive medium filter screens

[0071] First, POK, PE, maleic anhydride grafted polyethylene octene co-elastomer, PE grafted maleic anhydride, antioxidant 1010, antioxidant 168 and zinc stearate were dried in a vacuum oven at 80°C for 4 hours, and then mixed and stirred at room temperature according to the mass ratio of POK: PE: maleic anhydride grafted polyethylene octene co-elastomer: PE grafted maleic anhydride: antioxidant 1010-168: zinc stearate = 85:15:3:1.2:0.6:0.2, and then added to a twin-screw extruder. The processing temperature range of the twin-screw extruder is 180-240°C, and the specific temperature setting is:

[0072]

[0073] The main machine rotates at 300 rpm. The pellets obtained by strand pelletizing are dried in an oven at 90°C for 2 hours.

[0074] Next, the melt-mixed, high-temperature corrosion-resistant, high-strength fiber material for the corrosive medium filter is extruded through a single-screw extruder and metering pump at constant pressure. The material is evenly extruded through a spinneret with a 7mm aperture and then enters a cooling water tank to complete the shaping of the fiber embryo. The barrel temperature of the single-screw extruder is set at 200-260°C, the main engine speed is 400rpm, and the metering pump pressure is set at 11.5MPa.

[0075] Finally, the obtained silk embryo is sent into the preheated water tank through the first set of drafting rollers and then into the second set of drafting rollers to complete the first stretching. Then, it is sent into the constant temperature hot air box through the second set of drafting rollers and then into the third set of drafting rollers to complete the secondary stretching. Finally, it is sent into the wire separation and winding equipment by the third set of drafting rollers to complete the collection, and then the fiber with a linear density of 450tex is prepared. The linear speed of the drafting roller and the water tank temperature are set as follows.

[0076]

[0077] Comparative Example 1

[0078] This comparative example provides a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter. The preparation method thereof differs from that of Example 1 only in that the mass ratio of the components of POK: PE: maleic anhydride grafted polyethylene octene co-elastomer: PE grafted maleic anhydride: antioxidant 1010-168: zinc stearate is 100:0:3:1.2:0.6:0.2, and the remaining steps and parameters are the same.

[0079] Comparative Example 2

[0080] This comparative example provides a high-temperature, corrosion-resistant, high-strength fiber for use in corrosive media filters. The preparation method differs from that of Example 1 in that the obtained fiber embryo is fed through a first set of drafting rollers into a preheated water tank, where it is then fed into a second set of drafting rollers for primary stretching. The fiber embryo is then fed through the second set of drafting rollers into a constant-temperature hot air box, where it is then fed into a third set of drafting rollers for secondary stretching. Finally, the fiber is fed by the third set of drafting rollers into a separate and reeling device for collection. The water tank temperature is adjusted to 85°C, the hot air box temperature is adjusted to 130°C, the linear speed of the third set of drafting rollers is adjusted to 34.5, and the total stretch ratio is changed to 15. The remaining steps and parameters are the same as those of Example 1.

[0081] Test Case

[0082] The corrosive medium filter screens obtained in Examples 1-5 and Comparative Examples 1-2 were tested for fiber tensile strength using a Yangzhou Saisi WQ-700 universal testing machine using high-temperature resistant and corrosion-resistant high-strength fibers. The test results are shown in Table 1.

[0083] Table 1: Fiber properties

[0084]

[0085] From the fiber properties shown in Table 1, we can see that:

[0086] ① As the weight ratio of PE increases, the tensile strength of the fiber decreases slightly (Examples 1-3), which is similar to that of pure POK fiber (Comparative Example 1). When the PE addition reaches 25%, the tensile strength of the fiber decreases most significantly, with a drop of more than 20%.

[0087] ② As the total stretching ratio increases, the tensile strength of the fiber also increases (Example 2, Example 4, Example 5, Comparative Example 2).

[0088] ③ During the test, the increase in the total stretching ratio requires the water temperature and oven temperature to increase accordingly. The optimal temperature under the test conditions is 85℃ for the water tank and 130℃ for the oven.

[0089] In summary, by adding low-cost PE resin to high-temperature corrosion-resistant POK resin, along with varying proportions of specially selected toughening and compatibilizing components, the resulting fiber maintains corrosion resistance while reducing density and cost compared to POK resin. Furthermore, as the amount of PE added increases, the fiber's tensile strength initially increases and then decreases. This fiber can enable filter screens to better withstand high-temperature corrosion environments, further enhancing the application prospects of POK.

[0090] The present invention removes obstacles for the batch preparation of POK / PE fibers by technical means. POK / PE fibers can have broad application prospects in high-temperature medium filtration, corrosive medium filtration, bulletproof vests and other special textile industries.

[0091] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for preparing high-temperature resistant and corrosion-resistant high-strength fiber for corrosive medium filter screen, characterized in that: The steps are: (1) Preparation of special materials for high-temperature corrosion-resistant high-strength fibers for corrosive medium filter screens: First, POK, PE, maleic anhydride grafted polyethylene octene co-elastomer, PE grafted maleic anhydride, antioxidant, and zinc stearate are dried, mixed and stirred at room temperature, and then added to a twin-screw extruder for melt mixing. The processing temperature range of the twin-screw extruder is 180-240°C to prepare a special material for high-temperature corrosion-resistant high-strength fibers, wherein the antioxidant is a combination of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1, and the mass ratio of POK:PE:maleic anhydride grafted polyethylene octene co-elastomer:PE grafted maleic anhydride:antioxidant:zinc stearate is 95:5:3:1.2:0.6:0.2 or 85:15:3:1.2:0.6:0.2; (2) The melt-mixed corrosive medium filter screen is extruded with a high-temperature corrosion-resistant high-strength fiber special material through a single-screw extruder and a metering pump at an equal constant pressure, uniformly extruded through a spinneret, and enters a cooling water tank to complete the shaping of the silk embryo to obtain a silk embryo, wherein the barrel temperature of the single-screw extruder is set at 200-260°C; (3) The silk embryo is stretched by the first set of stretching rollers and then enters a preheated water tank with a temperature of 60-85°C, and then is stretched for the first time by the second set of stretching rollers. The fiber after the first stretching is sent to a constant temperature hot air box with a temperature of 110-130°C, and then is stretched for the second time by the third set of stretching rollers. Finally, the filament bundle stretched by the third set of stretching rollers is separated and wound to obtain high-temperature resistant and corrosion-resistant high-strength fiber for corrosive medium filter screen. The surface linear speed ratio of the second set of stretching rollers and the first set of stretching rollers is controlled at 2-6 times, and the surface linear speed ratio of the third set of stretching rollers and the second set of stretching rollers is controlled at 3-4 times.

2. The method for preparing a high-temperature-resistant and corrosion-resistant high-strength fiber for a corrosive medium filter according to claim 1, characterized in that: The number average molecular weight of the POK is between 40,000 and 120,000, and the melt index is 1-8 g / 10 min at 240° C. / 2.16 kg.

3. High-temperature-resistant and corrosion-resistant high-strength fiber for corrosive medium filter screen prepared by the preparation method according to any one of claims 1 or 2.

4. The use of the high-temperature-resistant and corrosion-resistant high-strength fiber for the corrosive medium filter according to claim 3, characterized in that: The high-temperature-resistant and corrosion-resistant high-strength fiber is used to prepare a filter screen that can be used in corrosive media.

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