阅读说明：本技术 一种衬氟式防腐自立式调节阀 (Fluorine-lined corrosion-resistant self-supporting regulating valve ) 是由 柴俊 赵亚南 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种衬氟式防腐自立式调节阀,涉及阀门领域,包括支撑底盘、安装架、转盘、螺纹杆、安装底盘、阀体外壳、衬氟内管、衬氟阀芯、复位弹簧,该衬氟式防腐自立式调节阀通过将衬氟内管、衬氟阀芯均分段设计,实现了调节阀的灵活控制,而且避免了水进入衬氟阀芯的上方,避免复位弹簧以及螺纹杆被腐蚀,影响调节阀的密封性以及使用寿命；通过由耐磨防腐材料制成的衬氟内管、衬氟阀芯,保证了良好的防腐效果的同时,增强其力学性能,耐磨性性优异,衬氟内管、衬氟阀芯多次摩擦仍然难以被破坏,进一步的保证了调节阀的密封性以及使用寿命。(The invention discloses a fluorine-lined type corrosion-resistant self-supporting regulating valve, which relates to the field of valves and comprises a supporting chassis, a mounting frame, a rotary disc, a threaded rod, a mounting chassis, a valve body shell, a fluorine-lined inner pipe, a fluorine-lined valve core and a return spring, wherein the fluorine-lined type corrosion-resistant self-supporting regulating valve realizes the flexible control of the regulating valve by sectional design of the fluorine-lined inner pipe and the fluorine-lined valve core, avoids water from entering the upper part of the fluorine-lined valve core, and avoids the influence on the sealing property and the service life of the regulating valve caused by the corrosion of the return spring and the threaded rod; through lining fluorine inner tube, lining fluorine case made by wear-resisting anticorrosive material, when having guaranteed good anticorrosive effect, strengthen its mechanical properties, the wearability is excellent, and lining fluorine inner tube, lining fluorine case multiple friction still are difficult to destroyed, further assurance the leakproofness and the life of governing valve.)

1. The fluorine-lined type corrosion-resistant self-supporting regulating valve comprises a supporting chassis (101), a mounting frame (102), a rotary table (103), a threaded rod (104), a mounting chassis (105), a valve body shell (106), a fluorine-lined inner pipe (107), a fluorine-lined valve core (108) and a return spring (109), and is characterized in that the fluorine-lined inner pipe (107) is mounted inside the valve body shell (106), the fluorine-lined valve core (108) is connected in an inner cavity of the fluorine-lined inner pipe (107) in a sliding manner, and the fluorine-lined inner pipe (107) and the fluorine-lined valve core (108) are both made of wear-resistant corrosion-resistant materials;

the preparation processes of the fluorine lining inner pipe (107) and the fluorine lining valve core (108) are as follows:

the method comprises the following steps: weighing 90-110 parts of modified polytetrafluoroethylene, 10-30 parts of modified boron nitride powder and 5-15 parts of polyimide according to parts by weight for later use

Step two: adding the modified polytetrafluoroethylene, the modified boron nitride powder and the polyimide into a mixer, mixing for 5-10min under the condition that the temperature is 1000-2000r/min, standing for 10min, and then repeatedly mixing for 5-10min to obtain the wear-resistant anticorrosive material;

step three: adding the mixture into a mold for molding, demolding to form an inner tube blank and a valve core blank, standing the inner tube blank and the valve core blank at room temperature for 1-2 days, then placing the inner tube blank and the valve core blank in a high-temperature muffle furnace, heating to 310-class sand 320 ℃ at a heating rate of 60 ℃/h, heating to 360-class sand 370 ℃ at a heating rate of 30 ℃/h, then sintering at constant temperature for 4.5h under the condition that the temperature is 360-class sand 370 ℃, then cooling to 300-class sand 310 ℃ at a cooling rate of 30 ℃/h, and finally cooling to room temperature at a cooling rate of 50 ℃/h to obtain a fluorine lining inner tube (107) and a fluorine lining valve core (108).

2. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 1, wherein a mounting chassis (105) is mounted at the top of the valve body shell (106), a supporting chassis (101) is mounted at the top of the mounting chassis (105), a mounting frame (102) is mounted at the top of the supporting chassis (101), a threaded rod (104) is mounted on the mounting frame (102) in a penetrating manner, the threaded rod (104) is in threaded connection with the mounting frame (102), a rotating disc (103) is mounted at the top end of the threaded rod (104), a return spring (109) is mounted at the top end of the fluorine-lined valve core (108), the top end of the return spring (109) is mounted at the bottom of the mounting chassis (105), and the top end of the fluorine-lined valve core (108) abuts against the bottom end of the threaded rod (104).

3. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 1, wherein the fluorine-lined inner pipe (107) comprises a sealing pipe, a water inlet pipe and a water outlet pipe, the sealing pipe is composed of a limiting pipe and a sealing pipe, the inner diameter of the limiting pipe is larger than that of the sealing pipe, the water inlet pipe is communicated to the bottom of one side of the sealing pipe, and the water outlet pipe is communicated to the bottom of one side of the limiting pipe; the fluorine lining valve core (108) comprises an upper sealing part and a lower sealing part, the upper sealing part is connected to the inner cavity of the limiting pipe in a sliding mode, the diameter of the upper sealing part is larger than the inner diameter of the sealing pipe, the thickness of the upper sealing part is larger than the diameter of the input end of the water outlet pipe, and the lower sealing part is connected to the inner cavity of the sealing pipe in a sliding mode.

4. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 1, wherein the modified polytetrafluoroethylene is prepared by the following steps:

a1: adding carbon tetrachloride, a catalyst and deionized water into a reaction kettle, then adding hexafluoropropylene oxide into the reaction kettle at the temperature of 15-20 ℃, stirring and reacting at a constant temperature of 50-150r/min for 30-60min, standing and layering a reaction product after the reaction is finished, rectifying a lower layer, and collecting 54-56 ℃ fraction to obtain an intermediate product;

a2: adding anhydrous sodium carbonate and dimethylacetamide into a reaction kettle, stirring and mixing for 5-10min under the condition that the stirring speed is 50-100r/min, then adding an intermediate product, continuously stirring and reacting for 30-60min, then continuously reacting at the temperature of 120-130 ℃ to collect condensate, and rectifying the condensate to collect 35-36 ℃ fraction to obtain a modified monomer;

a3: adding methanol, deionized water and a dispersing agent into a polymerization kettle, introducing nitrogen to replace air in the polymerization kettle, vacuumizing to 70-72kPa after the oxygen content is lower than 15ppm, adding a modified monomer, filling tetrafluoroethylene to the reaction kettle pressure of 0.6-1.6MPa under the conditions of stirring speed of 600 plus materials at 900r/min and temperature of 50-80 ℃, then adding an ammonium persulfate solution, maintaining the pressure in the reaction kettle, stirring for 3-5h, finishing the reaction, and collecting a reaction product to obtain the modified polytetrafluoroethylene.

5. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 4, wherein the molar ratio of carbon tetrachloride, catalyst, deionized water and hexafluoropropylene oxide in step A1 is 5: 0.25: 0.06: 10, the catalyst is one of tetramethylethylenediamine and cesium chloride.

6. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 4, wherein the molar ratio of the anhydrous sodium carbonate, the dimethylacetamide and the intermediate product in the step A2 is 1.0-1.2: 1.0: 1.0.

7. the fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 4, wherein the ammonium persulfate solution in the step A3 is ammonium persulfate according to a weight ratio of 1-3 g: 1L of the modified monomer is dissolved in distilled water to form a solution, and the mass ratio of methanol to deionized water to the modified monomer to ammonium persulfate is 0.1-0.3: 3-5: 10-12: 1: 3-5.

8. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 1, wherein the modified boron nitride powder is prepared by the following steps:

adding hexagonal boron nitride and polymethyl methacrylate into a reaction kettle, introducing carbon dioxide gas to replace air in the reaction kettle, increasing the pressure to 10-12MPa under the condition of 50 ℃, then stirring for 2-3h under the condition of stirring speed of 800r/min, and then ejecting a product through a nozzle, wherein the pressure release speed is controlled to be 2MPa/s, so as to obtain the modified boron nitride powder.

9. The fluorine-lined corrosion-resistant self-supporting regulating valve according to claim 8, wherein the dosage ratio of the hexagonal boron nitride to the polymethyl methacrylate is 10 mg: 1g of the total weight of the composition.

Technical Field

The invention relates to the field of valves, in particular to a fluorine-lined type corrosion-resistant self-supporting regulating valve.

Background

The valve is a control component in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting and the like. Valves are an indispensable part of fluid piping systems, and the pressure, temperature, flow rate, etc. of a fluid medium are changed by adjusting the valves. In the prior art, the corrosion resistance of the valve is improved by adopting polytetrafluoroethylene as a fluorine lining material.

Polytetrafluoroethylene has the characteristics of excellent dielectric property, chemical corrosion resistance, high and low temperature resistance, water resistance, non-sticking property, low friction coefficient, good self-lubricating property and the like, and is widely applied to the industrial fields of petrochemical industry, electronics, electrical, aviation, aerospace, semiconductors, machinery, textiles, household appliances, buildings, medicines, automobiles and the like. But also has the defects of difficult processing, poor stress cracking resistance, poor creep resistance and the like, and the pure polytetrafluoroethylene has poor capability of resisting compressive load, weak intermolecular acting force, and very easy adhesive abrasion and abrasive wear when being in butt-grinding with metal materials, and is one of the engineering plastics with extremely poor wear resistance.

Therefore, although the fluorine-lined valve prepared from polytetrafluoroethylene has excellent corrosion resistance, the wear resistance of the fluorine-lined valve is poor, and after the fluorine-lined valve is used for a long time, the valve core and the valve body are seriously abraded, so that the sealing property of the valve is sharply reduced, and the service life of the valve is influenced.

Therefore, a fluorine-lined corrosion-resistant self-supporting regulating valve having excellent corrosion resistance and wear resistance is needed to solve the above problems.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a fluorine-lined corrosion-resistant self-supporting regulating valve which comprises: the fluorine lining inner tube and the fluorine lining valve core are designed in sections, so that water is prevented from entering the upper part of the fluorine lining valve core, the return spring and the threaded rod are prevented from being corroded, the fluorine lining inner tube and the fluorine lining valve core made of wear-resistant and corrosion-resistant materials ensure good corrosion-resistant effect, simultaneously the mechanical property of the fluorine lining valve core is enhanced, the wear resistance is excellent,

the problem of current lining fluorine formula anticorrosive self-supporting governing valve although corrosion resisting property is excellent, its wearability is poor, and it is serious to wear and tear between long-time back valve core and the valve body, leads to the valve leakproofness to descend rapidly, influences the life of valve is solved.

The purpose of the invention can be realized by the following technical scheme:

a fluorine-lined type corrosion-resistant self-supporting regulating valve comprises a supporting chassis, a mounting frame, a rotary table, a threaded rod, a mounting chassis, a valve body shell, a fluorine-lined inner pipe, a fluorine-lined valve core and a return spring, wherein the fluorine-lined inner pipe is mounted inside the valve body shell, the fluorine-lined valve core is connected in the inner cavity of the fluorine-lined inner pipe in a sliding mode, and the fluorine-lined inner pipe and the fluorine-lined valve core are both made of wear-resistant corrosion-resistant materials;

the preparation process of the fluorine lining inner pipe and the fluorine lining valve core is as follows:

the method comprises the following steps: weighing 90-110 parts of modified polytetrafluoroethylene, 10-30 parts of modified boron nitride powder and 5-15 parts of polyimide according to parts by weight for later use

Step two: adding the modified polytetrafluoroethylene, the modified boron nitride powder and the polyimide into a mixer, mixing for 5-10min under the condition that the temperature is 1000-2000r/min, standing for 10min, and then repeatedly mixing for 5-10min to obtain the wear-resistant anticorrosive material;

step three: adding the mixture into a mold for molding, demolding to form an inner tube blank and a valve core blank, standing the inner tube blank and the valve core blank at room temperature for 1-2 days, then placing the inner tube blank and the valve core blank in a high-temperature muffle furnace, heating to 310-class sand 320 ℃ at a heating rate of 60 ℃/h, heating to 360-class sand 370 ℃ at a heating rate of 30 ℃/h, then sintering at constant temperature for 4.5h under the condition that the temperature is 360-class sand 370 ℃, then cooling to 300-class sand 310 ℃ at a cooling rate of 30 ℃/h, and finally cooling to room temperature at a cooling rate of 50 ℃/h to obtain the fluorine lining inner tube and the fluorine lining valve core.

As a further scheme of the invention: the installation chassis is installed at the top of valve body shell, the support chassis is installed at the top on installation chassis, the mounting bracket is installed at the top on support chassis, run through on the mounting bracket and install the threaded rod, threaded rod and mounting bracket threaded connection, the carousel is installed on the top of threaded rod, reset spring is installed at the top of lining fluorine case, reset spring's top is installed in the bottom on installation chassis, the top butt of lining fluorine case is to the bottom of threaded rod.

As a further scheme of the invention: the inner fluorine lining pipe comprises a sealing pipe, a water inlet pipe and a water outlet pipe, the sealing pipe comprises a limiting pipe and a sealing pipe, the inner diameter of the limiting pipe is larger than that of the sealing pipe, the water inlet pipe is communicated to the bottom of one side of the sealing pipe, and the water outlet pipe is communicated to the bottom of one side of the limiting pipe; the fluorine lining valve core comprises an upper sealing part and a lower sealing part, the upper sealing part is connected to the inner cavity of the limiting pipe in a sliding mode, the diameter of the upper sealing part is larger than the inner diameter of the sealing pipe, the thickness of the upper sealing part is larger than the diameter of the input end of the water outlet pipe, and the lower sealing part is connected to the inner cavity of the sealing pipe in a sliding mode.

As a further scheme of the invention: the preparation process of the modified polytetrafluoroethylene comprises the following steps:

a1: adding carbon tetrachloride, a catalyst and deionized water into a reaction kettle, then adding hexafluoropropylene oxide into the reaction kettle at the temperature of 15-20 ℃, stirring and reacting at a constant temperature of 50-150r/min for 30-60min, standing and layering a reaction product after the reaction is finished, rectifying a lower layer, and collecting 54-56 ℃ fraction to obtain an intermediate product;

a2: adding anhydrous sodium carbonate and dimethylacetamide into a reaction kettle, stirring and mixing for 5-10min under the condition that the stirring speed is 50-100r/min, then adding an intermediate product, continuously stirring and reacting for 30-60min, then continuously reacting at the temperature of 120-130 ℃ to collect condensate, and rectifying the condensate to collect 35-36 ℃ fraction to obtain a modified monomer;

a3: adding methanol, deionized water and a dispersing agent into a polymerization kettle, introducing nitrogen to replace air in the polymerization kettle, vacuumizing to 70-72kPa after the oxygen content is lower than 15ppm, adding a modified monomer, filling tetrafluoroethylene to the reaction kettle pressure of 0.6-1.6MPa under the conditions of stirring speed of 600 plus materials at 900r/min and temperature of 50-80 ℃, then adding an ammonium persulfate solution, maintaining the pressure in the reaction kettle, stirring for 3-5h, finishing the reaction, and collecting a reaction product to obtain the modified polytetrafluoroethylene.

As a further scheme of the invention: the molar ratio of the carbon tetrachloride, the catalyst, the deionized water and the hexafluoropropylene oxide in the step A1 is 5: 0.25: 0.06: 10, the catalyst is one of tetramethylethylenediamine and cesium chloride.

As a further scheme of the invention: the molar ratio of the anhydrous sodium carbonate, the dimethylacetamide and the intermediate product in the step A2 is 1.0-1.2: 1.0: 1.0.

as a further scheme of the invention: the ammonium persulfate solution in step A3 is ammonium persulfate according to a weight ratio of 1-3 g: 1L of the modified monomer is dissolved in distilled water to form a solution, and the mass ratio of methanol to deionized water to the modified monomer to ammonium persulfate is 0.1-0.3: 3-5: 10-12: 1: 3-5.

As a further scheme of the invention: the preparation process of the modified boron nitride powder is as follows:

adding hexagonal boron nitride and polymethyl methacrylate into a reaction kettle, introducing carbon dioxide gas to replace air in the reaction kettle, increasing the pressure to 10-12MPa under the condition of 50 ℃, then stirring for 2-3h under the condition of stirring speed of 800r/min, and then ejecting a product through a nozzle, wherein the pressure release speed is controlled to be 2MPa/s, so as to obtain the modified boron nitride powder.

As a further scheme of the invention: the dosage ratio of the hexagonal boron nitride to the polymethyl methacrylate is 10 mg: 1g of the total weight of the composition.

The invention has the beneficial effects that:

the invention relates to a fluorine-lined type anticorrosion self-supporting regulating valve which comprises a supporting base plate, an installation frame, a rotary plate, a threaded rod, an installation base plate, a valve body shell, a fluorine-lined inner pipe, a fluorine-lined valve core and a reset spring, wherein the threaded rod is driven to rotate by the rotary plate, so that the length of the threaded rod extending into the fluorine-lined inner pipe is controlled, the position of the fluorine-lined valve core is further controlled, when an upper sealing part of the fluorine-lined valve core is contacted with the top end of a sealing pipe of the fluorine-lined inner pipe, a limiting pipe and a water outlet pipe are sealed by the upper sealing part, the sealing pipe is sealed by a lower sealing part, the regulating valve is closed, when the fluorine-lined valve core is pulled to the highest point by the reset spring, the fluorine-lined valve core is positioned above the input end of the water outlet pipe, and the regulating valve is opened; the fluorine-lined inner tube and the fluorine-lined valve core are designed in a segmented manner, so that the flexible control of the regulating valve is realized, water is prevented from entering the upper part of the fluorine-lined valve core, and the influence on the sealing property and the service life of the regulating valve caused by the corrosion of the reset spring and the threaded rod is avoided;

the fluorine-lined inner tube and the fluorine-lined valve core are made of wear-resistant anticorrosive materials, wherein the modified polytetrafluoroethylene is formed by polymerizing tetrafluoroethylene and modified monomers, the polytetrafluoroethylene has the performance characteristics of chemical corrosion resistance, high and low temperature resistance, water resistance, non-sticking, low friction coefficient, good self-lubricating property and the like, but also has the defects of difficult processing, stress cracking resistance and poor creep resistance, and the main reasons for generating the defects are that the polytetrafluoroethylene has a symmetrical structure, the polarity of a C-F bond is large, the intermolecular force is large, the crystallinity is high, the crystallization melting temperature is high, and the modified monomers are introduced into the polytetrafluoroethylene to reduce the intermolecular force and reduce the crystallinity and the melt viscosity, so that the excellent characteristics of the polytetrafluoroethylene can be maintained, and the polytetrafluoroethylene can be endowed with good processing performance; by adding modified boron nitride powder and polyimide into modified polytetrafluoroethylene, the polyimide not only has excellent high temperature resistance, but also has excellent mechanical property and good wear resistance and high temperature resistance, boron nitride molecules have parallel lamellar structures, the lamellar structures can slide under the action of shearing force by virtue of the restraint of Van der Waals force, and a lubricating film with extremely thin and high adhesiveness can be formed on the surfaces of metals and other hard objects, so that on one hand, the large-area falling damage of the friction surfaces of the modified polytetrafluoroethylene during relative motion can be prevented, on the other hand, the friction coefficient can be reduced by virtue of the lubricating film formed by the polyimide, the modified polytetrafluoroethylene material is effectively protected, but boron nitride is an inorganic nano filler, is easy to gather, difficult to uniformly distribute and poor in compatibility, and therefore, in the rapid pressure relief process, the gathering structure of the boron nitride can be broken up by virtue of huge pressure difference, after the boron nitride is dispersed, the boron nitride is easy to reunite after a period of time, and the boron nitride is coated by the polymethyl methacrylate, so that the reunion of the boron nitride can be effectively avoided, and the compatibility between the boron nitride and organic matters is improved.

In summary, the fluorine-lined anti-corrosion self-supporting regulating valve realizes flexible control of the regulating valve by designing the fluorine-lined inner pipe and the fluorine-lined valve core in sections, avoids water from entering the upper part of the fluorine-lined valve core, and avoids the influence on the sealing property and the service life of the regulating valve caused by the corrosion of the return spring and the threaded rod; through lining fluorine inner tube, lining fluorine case made by wear-resisting anticorrosive material, when having guaranteed good anticorrosive effect, strengthen its mechanical properties, the wearability is excellent, and lining fluorine inner tube, lining fluorine case multiple friction still are difficult to destroyed, further assurance the leakproofness and the life of governing valve.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a fluorine-lined corrosion protection self-supporting regulator valve according to the present invention;

FIG. 2 is a schematic view of the internal structure of the mounting base plate of the present invention;

FIG. 3 is a schematic view showing the internal structure of the fluorine-lined inner tube of the present invention.

In the figure: 101. a support chassis; 102. a mounting frame; 103. a turntable; 104. a threaded rod; 105. installing a chassis; 106. a valve body housing; 107. lining a fluorine inner pipe; 108. a fluorine lined valve core; 109. a return spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1-3, the present embodiment is a fluorine-lined corrosion-resistant self-supporting regulating valve, including a supporting chassis 101, a mounting frame 102, a turntable 103, a threaded rod 104, a mounting chassis 105, a valve body housing 106, a fluorine-lined inner tube 107, a fluorine-lined valve core 108, and a return spring 109, where the mounting chassis 105 is mounted at the top of the valve body housing 106, the supporting chassis 101 is mounted at the top of the mounting chassis 105, the mounting frame 102 is mounted at the top of the supporting chassis 101, the threaded rod 104 is mounted on the mounting frame 102 in a penetrating manner, the threaded rod 104 is in threaded connection with the mounting frame 102, and the turntable 103 is mounted at the top end of the threaded rod 104;

a fluorine lining inner pipe 107 is arranged in the valve body shell 106, a fluorine lining valve core 108 is connected in an inner cavity of the fluorine lining inner pipe 107 in a sliding manner, a return spring 109 is arranged at the top of the fluorine lining valve core 103, the top end of the return spring 109 is arranged at the bottom of the mounting base plate 105, and the top of the fluorine lining valve core 108 is abutted to the bottom end of the threaded rod 104;

the inner fluorine lining pipe 107 and the inner fluorine lining valve core 108 are both made of wear-resistant and corrosion-resistant materials, the inner fluorine lining pipe 107 comprises a sealing pipe, a water inlet pipe and a water outlet pipe, the sealing pipe is composed of a limiting pipe and a sealing pipe, the inner diameter of the limiting pipe is larger than that of the sealing pipe, the water inlet pipe is communicated with the bottom of one side of the sealing pipe, and the water outlet pipe is communicated with the bottom of one side of the limiting pipe; the fluorine lining valve core 108 comprises an upper sealing part and a lower sealing part, the upper sealing part is connected to the inner cavity of the limiting pipe in a sliding mode, the diameter of the upper sealing part is larger than the inner diameter of the sealing pipe, the thickness of the upper sealing part is larger than the diameter of the input end of the water outlet pipe, and the lower sealing part is connected to the inner cavity of the sealing pipe in a sliding mode.

The threaded rod 104 is driven to rotate by the rotary table 103, so that the length of the threaded rod 104 extending into the fluorine lining inner tube 107 is controlled, the position of the fluorine lining valve core 108 is further controlled, when the upper sealing part of the fluorine lining valve core 108 is contacted with the top end of the sealing tube of the fluorine lining inner tube 107, the limiting tube and the water outlet tube are sealed by the upper sealing part at the moment, the sealing tube is sealed by the lower sealing part, so that the regulating valve is closed, when the reset spring 109 stretches the fluorine lining valve core 108 to the highest point, the fluorine lining valve core 108 is positioned above the input end of the water outlet tube, and the regulating valve is opened; by equally dividing the inner pipe 107 and the valve core 108 into sections, the flexible control of the regulating valve is realized, water is prevented from entering the upper part of the valve core 108, and the influence on the sealing performance and the service life of the regulating valve caused by the corrosion of a return spring and a threaded rod is avoided.

Example 2:

this embodiment is a process for preparing modified polytetrafluoroethylene, comprising the following steps:

a1: adding carbon tetrachloride, a catalyst and deionized water into a reaction kettle, then adding hexafluoropropylene oxide into the reaction kettle at the temperature of 15 ℃, stirring and reacting for 30min at a constant temperature under the stirring speed of 50r/min, standing and layering a reaction product after the reaction is finished, rectifying a lower layer, and collecting a fraction at 54 ℃ to obtain an intermediate product; controlling the mole ratio of the carbon tetrachloride to the catalyst to the deionized water to the hexafluoropropylene oxide to be 5: 0.25: 0.06: 10, the catalyst is cesium chloride;

a2: adding anhydrous sodium carbonate and dimethylacetamide into a reaction kettle, stirring and mixing for 5min under the condition that the stirring speed is 50r/min, then adding an intermediate product, continuously stirring and reacting for 30min, then continuously reacting at 120 ℃ to collect condensate, and rectifying the condensate to collect 35 ℃ fraction to obtain a modified monomer; controlling the molar ratio of the anhydrous sodium carbonate, the dimethylacetamide and the intermediate product to be 1.0: 1.0: 1.0;

a3: adding methanol, deionized water and a dispersing agent into a polymerization kettle, introducing nitrogen to replace air in the polymerization kettle, vacuumizing to 70kPa after the oxygen content is lower than 15ppm, adding a modified monomer, filling tetrafluoroethylene to the reaction kettle under the conditions of a stirring speed of 600r/min and a temperature of 50 ℃ until the pressure of the reaction kettle is 0.6MPa, then adding an ammonium persulfate solution, maintaining the pressure in the reaction kettle, stirring for reaction for 3 hours, and collecting a reaction product after the reaction is finished to obtain modified polytetrafluoroethylene; and controlling the ammonium persulfate solution to be ammonium persulfate according to the weight ratio of 1-3 g: 1L of the modified monomer is dissolved in distilled water to form a solution, and the mass ratio of methanol to deionized water to the modified monomer to ammonium persulfate is 0.1: 3: 10: 1: 3.

example 3:

this embodiment is a process for preparing modified polytetrafluoroethylene, comprising the following steps:

a1: adding carbon tetrachloride, a catalyst and deionized water into a reaction kettle, then adding hexafluoropropylene oxide into the reaction kettle at the temperature of 20 ℃, stirring and reacting for 60min at a constant temperature under the stirring speed of 150r/min, standing and layering a reaction product after the reaction is finished, rectifying a lower layer, and collecting fractions at the temperature of 56 ℃ to obtain an intermediate product; controlling the mole ratio of the carbon tetrachloride to the catalyst to the deionized water to the hexafluoropropylene oxide to be 5: 0.25: 0.06: 10, the catalyst is tetramethylethylenediamine;

a2: adding anhydrous sodium carbonate and dimethylacetamide into a reaction kettle, stirring and mixing for 10min under the condition that the stirring speed is 100r/min, then adding an intermediate product, continuously stirring and reacting for 60min, then continuously reacting at the temperature of 130 ℃ to collect condensate, rectifying the condensate, and collecting 36 ℃ fraction to obtain a modified monomer; controlling the molar ratio of the anhydrous sodium carbonate to the dimethylacetamide to the intermediate product to be 1.2: 1.0: 1.0;

a3: adding methanol, deionized water and a dispersing agent into a polymerization kettle, introducing nitrogen to replace air in the polymerization kettle, vacuumizing to 72kPa after the oxygen content is lower than 15ppm, adding a modified monomer, filling tetrafluoroethylene to the reaction kettle under the conditions of a stirring speed of 900r/min and a temperature of 80 ℃ until the pressure of the reaction kettle is 1.6MPa, then adding an ammonium persulfate solution, maintaining the pressure in the reaction kettle, stirring for reaction for 5 hours, and collecting a reaction product after the reaction is finished to obtain modified polytetrafluoroethylene; controlling the ammonium persulfate solution to be ammonium persulfate according to the weight ratio of 3 g: 1L of the modified monomer is dissolved in distilled water to form a solution, and the mass ratio of methanol to deionized water to the modified monomer to ammonium persulfate is 0.3: 5: 12: 1: 5.

example 4:

this embodiment is a process for preparing a modified boron nitride powder, including the following steps:

adding hexagonal boron nitride and polymethyl methacrylate (Mn =2000 g/mol) into a reaction kettle, introducing carbon dioxide gas to replace air in the reaction kettle, raising the pressure to 10MPa under the condition that the temperature is 50 ℃, then stirring for 2 hours under the condition that the stirring speed is 500r/min, then ejecting a product through a nozzle, and controlling the pressure release speed to be 2MPa/s to obtain modified boron nitride powder; controlling the dosage ratio of the hexagonal boron nitride to the polymethyl methacrylate to be 10 mg: 1g of the total weight of the composition.

Example 5:

this embodiment is a process for preparing a modified boron nitride powder, including the following steps:

adding hexagonal boron nitride and polymethyl methacrylate (Mn =2000 g/mol) into a reaction kettle, introducing carbon dioxide gas to replace air in the reaction kettle, raising the pressure to 12MPa at the temperature of 50 ℃, then stirring for 3h at the stirring speed of 800r/min, then ejecting a product through a nozzle, and controlling the pressure release speed to be 2MPa/s to obtain modified boron nitride powder; controlling the dosage ratio of the hexagonal boron nitride to the polymethyl methacrylate to be 10 mg: 1g of the total weight of the composition.

Example 6:

the embodiment is a fluorine lining type anticorrosion self-supporting regulating valve, a fluorine lining inner pipe is arranged in a valve body shell, a fluorine lining valve core is connected in an inner cavity of the fluorine lining inner pipe in a sliding manner, and the fluorine lining inner pipe and the fluorine lining valve core are both made of wear-resistant anticorrosive materials;

the preparation processes of the fluorine lining inner pipe 107 and the fluorine lining valve core 108 are as follows:

the method comprises the following steps: 90 parts of modified polytetrafluoroethylene from example 2, 10 parts of modified boron nitride powder from example 4 and 5 parts of polyimide (type YS 20) are weighed according to parts by weight for later use

Step two: adding modified polytetrafluoroethylene, modified boron nitride powder and polyimide into a mixer, mixing for 5min at the temperature of 1000r/min, standing for 10min, and repeatedly mixing for 5min to obtain a wear-resistant anticorrosive material;

step three: adding the mixture into a mold for compression molding, demolding to form an inner tube blank and a valve core blank, standing the inner tube blank and the valve core blank at room temperature for 1 day, then placing the inner tube blank and the valve core blank in a high-temperature muffle furnace, heating to 310 ℃ at a heating rate of 60 ℃/h, heating to 360 ℃ at a heating rate of 30 ℃/h, then sintering at constant temperature for 4.5 hours at the temperature of 360 ℃, then cooling to 300 ℃ at a cooling rate of 30 ℃/h, and finally cooling to room temperature at a cooling rate of 50 ℃/h to obtain the fluorine lining inner tube 107 and the fluorine lining valve core 108.

Example 7:

the embodiment is a fluorine lining type anticorrosion self-supporting regulating valve, a fluorine lining inner pipe is arranged in a valve body shell, a fluorine lining valve core is connected in an inner cavity of the fluorine lining inner pipe in a sliding manner, and the fluorine lining inner pipe and the fluorine lining valve core are both made of wear-resistant anticorrosive materials;

the preparation processes of the fluorine lining inner pipe 107 and the fluorine lining valve core 108 are as follows:

the method comprises the following steps: 110 parts of modified polytetrafluoroethylene from example 3, 30 parts of modified boron nitride powder from example 5 and 15 parts of polyimide (model YS 20) are weighed according to parts by weight for later use

Step two: adding modified polytetrafluoroethylene, modified boron nitride powder and polyimide into a mixer, mixing for 10min at the temperature of 2000r/min, standing for 10min, and repeatedly mixing for 10min to obtain a wear-resistant anticorrosive material;

step three: adding the mixture into a mold for compression molding, demolding to form an inner tube blank and a valve core blank, standing the inner tube blank and the valve core blank at room temperature for 2 days, then placing the inner tube blank and the valve core blank in a high-temperature muffle furnace, heating to 320 ℃ at a heating rate of 60 ℃/h, heating to 370 ℃ at a heating rate of 30 ℃/h, then sintering at a constant temperature of 370 ℃ for 4.5 hours, cooling to 310 ℃ at a cooling rate of 30 ℃/h, and finally cooling to room temperature at a cooling rate of 50 ℃/h to obtain the fluorine lining inner tube 107 and the fluorine lining valve core 108.

Comparative example 1:

comparative example 1 differs from example 7 in that polytetrafluoroethylene was used to make the fluorine-lined inner tube, fluorine-lined valve core.

Comparative example 2:

comparative example 2 differs from example 7 in that a fluorine-lined inner tube and a fluorine-lined valve element were produced using polytetrafluoroethylene and boron nitride powder in a mass ratio of 11: 3.

Comparative example 3:

comparative example 3 differs from example 7 in that polytetrafluoroethylene, boron nitride powder, polyimide were used in a ratio of 110: 30: 15 to prepare a fluorine-lined inner pipe and a fluorine-lined valve core.

The fluorine-lined valve cores of examples 6 to 7 and comparative examples 1 to 3 were subjected to impact performance testing in accordance with GB/T1043-1993 standards. Hardness testing was performed according to ASTM D2240-2015 using Shore D model. According to the GB/T3960-2016 standard, the ring-block contact type dry friction is carried out on a sample piece at room temperature by using a grinding ring.

Sample (I)	Impact Strength/(KJ/mm)2）	hardness/HD	Wear rate/. times.10-6N·m
				Example 6	9.35	64	2.8
Example 7	9.41	67	2.4
				Comparative example 1	2.14	42	137
Comparative example 2	6.68	54	29
				Comparative example 3	7.49	58	11

Referring to the data in the table, it can be known that the fluorine-lined inner tube and the fluorine-lined valve core of the present invention have better wear resistance than those of the prior art (directly prepared by using polytetrafluoroethylene and fluorine-lined valve core) according to the example and the comparative example 1, and compared with the examples and the comparative examples 2 to 3, the performance of the polytetrafluoroethylene is improved by adding the boron nitride powder and the polyimide, and the prepared fluorine-lined inner tube and the fluorine-lined valve core have better mechanical properties by modifying the polytetrafluoroethylene and the boron nitride powder.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.