Corrosion-resistant polytetrafluoroethylene composite material, processing method thereof and application of corrosion-resistant polytetrafluoroethylene composite material in air bag pump

Abstract

The invention provides a corrosion-resistant polytetrafluoroethylene composite material, a processing method thereof and application of the corrosion-resistant polytetrafluoroethylene composite material in an air bag pump. Relates to the technical field of air bag materials. The corrosion-resistant polytetrafluoroethylene composite material comprises 90 to 110 parts of a modified PTFE matrix, 5 to 10 parts of a heat conduction reinforcing agent, 8 to 15 parts of a lubricant, 5 to 10 parts of a processing aid, 10 to 15 parts of a flexibilizer and 0.5 to 2 parts of an antioxidant, the modified PTFE matrix is obtained by modifying PTFE modified by copolymerization of perfluoro n-propyl vinyl ether, polyphenylene sulfide fibers, a 2-ureido-4 (1H)-pyrimidone derivative, a coupling agent and amino propyl heptaisobutyl silsesquioxane. The corrosion-resistant polytetrafluoroethylene composite material disclosed by the invention can be applied to an air bag material, so that the corrosion resistance, mechanical strength and wear resistance of the air bag material at high temperature are improved.

Description

Technical Field

[0001] This invention relates to the field of wind bag material technology, and more specifically, to corrosion-resistant polytetrafluoroethylene composite materials, their processing methods, and their application in wind bag pumps. Background Technology

[0002] In semiconductor wet manufacturing processes, dozens of ultrapure acids, alkalis, and water are often required for etching, grinding, and cleaning processes. These liquids are typically transported using a blower pump. The blower pump adjusts its volume by expanding and contracting its internal blower to draw in and discharge the liquid. The blower is the core component of the blower pump. During operation, the blower continuously reciprocates, and stress concentration occurs during its elongation and contraction. Prolonged operation can lead to localized fatigue damage. When the blower deforms beyond its pressure resistance limit, excessive deformation or rupture occurs. Blower rupture can cause chemical leakage, leading to safety accidents, semiconductor equipment downtime, significant economic losses, and even personal injury. Etching processes often involve heating, requiring the blower pump's material to possess corrosion resistance not only at room temperature but also at high temperatures, along with good corrosion resistance, mechanical strength, and toughness. Summary of the Invention

[0003] The first aspect of this invention provides a corrosion-resistant polytetrafluoroethylene composite material, comprising, by weight, 90-110 parts of modified PTFE matrix, 5-10 parts of thermal conductivity enhancer, 8-15 parts of lubricant, 5-10 parts of processing aid, 10-15 parts of toughening agent, and 0.5-2 parts of antioxidant.

[0004] The preparation method of the modified PTFE matrix includes PTFE copolymerized with perfluoropropyl vinyl ether, polyphenylene sulfide fiber, 2-ureido-4(1H)-pyrimidinone derivative, coupling agent, and modified with aminopropylheptaisobutylsilsesquioxane.

[0005] Optionally, the modified PTFE matrix consists of 95-105 parts, thermal conductivity enhancer 7-9 parts, lubricant 10-13 parts, processing aid 8-9 parts, toughening agent 12-14 parts, and antioxidant 0.8-1.5 parts.

[0006] This invention uses perfluoropropyl vinyl ether copolymerization to modify PTFE, thereby reducing the melting point of polytetrafluoroethylene (PTFE) and enabling the melt processing of PTFE. The modified PTFE matrix is ​​obtained by copolymerizing PTFE with perfluoropropyl vinyl ether, polyphenylene sulfide fiber, 2-ureido-4(1H)-pyrimidinone derivative, coupling agent, and aminopropylheptaisobutylsilsesquioxane. The 2-ureido-4[1H]-pyrimidinone (UPy) quadruple hydrogen bonds in the modified PTFE matrix can dynamically recombine in acid / alkali environments, repairing microcracks and improving mechanical strength and fracture toughness. At high temperatures, polyphenylene sulfide (PPS) fibers form a rigid-flexible gradient transition layer with UPy, which can suppress stress concentration, improve toughness, and act as a rigid reinforcing skeleton. Aminopropyl heptaisobutylsilsesquioxane forms a nanocage corrosion-resistant barrier, improving corrosion resistance. The Si-O-Si network in aminopropyl heptaisobutylsilsesquioxane is coupled with PTFE through a coupling agent, blocking acid / alkali penetration. The ethoxy groups in aminopropyl heptaisobutylsilsesquioxane can form hydrogen bonds with UPy, causing UPy to detach at high temperatures. The modified PTFE matrix, combined with thermally conductive reinforcing agents, lubricants, processing aids, toughening agents, and antioxidants, can improve the corrosion resistance, mechanical properties, and abrasion resistance of corrosion-resistant PTFE composites at high temperatures.

[0007] Optionally, by weight, there are 90-100 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 20-25 parts of polyphenylene sulfide fiber, 8-12 parts of 2-ureido-4(1H)-pyrimidinone derivative, 5-10 parts of aminopropyl heptaisobutylsilsesquioxane, and 1-3 parts of coupling agent.

[0008] Optional, 94-97 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 22-24 parts of polyphenylene sulfide fiber, 9-11 parts of 2-ureido-4(1H)-pyrimidinone derivative, 7-9 parts of aminopropyl heptaisobutylsilsesquioxane, and 2-3 parts of coupling agent.

[0009] Optionally, the preparation method of the modified PTFE matrix includes the following steps:

[0010] S1: Pretreated polyphenylene sulfide fibers are obtained by plasma grafting perfluorooctyl carboxylic acid onto polyphenylene sulfide fibers; optionally, the plasma grafting conditions are 140-160W.

[0011] S2: Perfluoropropyl vinyl ether copolymerized modified PTFE is added to 2-ureido-4(1H)-pyrimidinone derivative, aminopropyl heptaisobutylsilsesquioxane and coupling agent for blending to obtain mixed powder;

[0012] S3: Mix the mixed powder and pretreated polyphenylene sulfide fiber, and perform hot-press infiltration at 180-220℃ and 12-18MPa; optionally, perform hot-press infiltration at 190-200℃ and 14-16MPa.

[0013] S4: The hot-pressed infiltration material is subjected to gradient sintering at a temperature of 230-400℃ to obtain a modified PTFE matrix.

[0014] Optionally, the gradient sintering in step S4 includes the following steps: first, sintering at a temperature of 230-270℃ for 1-2 hours, then raising the temperature to 300-340℃ for 1-2 hours, and then raising the temperature to 360-400℃ for 2-3 hours.

[0015] Optionally, the melting point of the perfluoropropyl vinyl ether copolymerized PTFE is not higher than 300°C, and the melt viscosity is not higher than 10. 5 Pa.s.

[0016] Optionally, the preparation method of perfluoropropyl vinyl ether copolymerized modified PTFE includes the following steps:

[0017] Deionized water, emulsifier, stabilizer and a small amount of perfluoropropyl vinyl ether are mixed, vacuumed and cooled, a small amount of tetrafluoroethylene is added, and then the temperature is raised to 65-75℃. Under a pressure of 2-3MPa, the remaining tetrafluoroethylene and the remaining perfluoropropyl vinyl ether are continuously introduced while stirring. An initiator is added to carry out a copolymerization reaction to obtain perfluoropropyl vinyl ether copolymerized modified PTFE.

[0018] Optional, by weight, 88-95 parts of tetrafluoroethylene, 5-10 parts of perfluoropropyl vinyl ether, 150-200 parts of deionized water, 0.5-2 parts of emulsifier, 0.1-1 parts of initiator, and 1-3 parts of stabilizer.

[0019] Optional, by weight, 90-95 parts of tetrafluoroethylene, 7-9 parts of perfluoropropyl vinyl ether, 170-190 parts of deionized water, 0.8-1.5 parts of emulsifier, 0.4-0.8 parts of initiator, and 2-3 parts of stabilizer.

[0020] Optionally, the preparation method of perfluoropropyl vinyl ether copolymerized modified PTFE includes the following steps:

[0021] Deionized water, emulsifier, stabilizer, and a small amount of perfluoropropyl vinyl ether (3-7% of the total mass of perfluoropropyl vinyl ether) are mixed, vacuumed and cooled, and a small amount of tetrafluoroethylene (5-10% of the total mass of tetrafluoroethylene) is added. Then the temperature is raised to 65-75°C, and tetrafluoroethylene and perfluoropropyl vinyl ether are continuously introduced under a pressure of 2-3 MPa while stirring. An initiator is added to carry out a copolymerization reaction to obtain perfluoropropyl vinyl ether copolymerized modified PTFE.

[0022] Optionally, the emulsifier is ammonium perfluorooctanoate.

[0023] Optionally, the stabilizer may be paraffin or a long-chain fluorocarbon compound.

[0024] Optionally, the initiator is a persulfate, such as one or both of potassium persulfate and ammonium persulfate.

[0025] Optionally, the thermal conductivity enhancer is boron nitride nanosheets. Optionally, the thickness of the boron nitride nanosheets is no more than 4 nm, which can enhance the thermal conductivity and wear resistance of the corrosion-resistant polytetrafluoroethylene composite material.

[0026] Optionally, the lubricant is one or more of fluorine-based, wax-based, and silicone-based products; further, the lubricant is graphene / PTFE core-shell powder, with a graphene coating rate of not less than 80%. This can improve the friction resistance of corrosion-resistant polytetrafluoroethylene composite materials.

[0027] Optionally, the processing aid is perfluoropolyether oil with a molecular weight of 3000-5000.

[0028] Optionally, the toughening agent is one or more of nylon elastomers, epoxy toughening agents, or tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers.

[0029] Optionally, the antioxidant may be one or more of the following: copper salt antioxidants, phosphate antioxidants, hindered phenolic antioxidants, phosphite antioxidants, thioester antioxidants, and polymeric antioxidants. For example, the antioxidant may be tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168) or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010).

[0030] The coupling agent is one or more of zirconate coupling agents, silane coupling agents, and aluminate coupling agents.

[0031] A second aspect of the present invention provides a method for processing a corrosion-resistant polytetrafluoroethylene composite material, the method comprising the following steps:

[0032] (1) The modified PTFE matrix and toughening agent are premixed at a certain temperature to obtain a premixed material;

[0033] (2) The thermal conductivity enhancer is dispersed in the processing aid, then mixed with the premix, and then lubricant and antioxidant are added for blending. The mixture is then molded and sintered at high temperature to obtain a corrosion-resistant polytetrafluoroethylene composite material.

[0034] Optionally, the premixing temperature in step (1) shall not exceed 80°C.

[0035] Optionally, the mixing temperature in step (2) is 200-300℃.

[0036] Optionally, the molding temperature is 10-30℃ and the pressure is 50-100MPa.

[0037] Optional, the sintering temperature is 230-350℃.

[0038] The third invention provides an application of corrosion-resistant polytetrafluoroethylene composite material in a wind pump.

[0039] Compared with the prior art, the present invention achieves at least one of the following beneficial effects:

[0040] (1) The corrosion-resistant polytetrafluoroethylene composite material of the present invention is modified with PTFE matrix and thermally conductive reinforcing agent, lubricant, processing aid, toughening agent and antioxidant, which can improve the corrosion resistance, mechanical properties and friction resistance of the corrosion-resistant polytetrafluoroethylene composite material at high temperature.

[0041] (2) The modified PTFE matrix in the corrosion-resistant polytetrafluoroethylene composite material of the present invention is obtained by copolymerizing PTFE with perfluoropropyl vinyl ether, polyphenylene sulfide fiber, 2-ureido-4(1H)-pyrimidinone derivative, coupling agent, and aminopropylheptaisobutylsilsesquioxane. The 2-ureido-4[1H]-pyrimidinone (UPy) quadruple hydrogen bonds (bond energy ≈ 100kJ / mol) in the modified PTFE matrix can dynamically recombine in acid / alkali environments, repair microcracks, and improve mechanical strength and fracture toughness. The polyphenylene sulfide fiber (PPS fiber) forms a "rigid-flexible" gradient transition layer with UPy at high temperature, which can suppress stress concentration, improve toughness, and play the role of rigid reinforcement skeleton. The aminopropylheptaisobutylsilsesquioxane can form a nanocage corrosion-resistant barrier to improve corrosion resistance. The Si-O-Si network in the aminopropylheptaisobutylsilsesquioxane is coupled with PTFE through a coupling agent, which can block acid / alkali penetration.

[0042] (3) The corrosion-resistant polytetrafluoroethylene composite material of the present invention can be applied to the air bag material of the air bag pump to improve the corrosion resistance, mechanical strength and wear resistance of the air bag material at high temperature. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0044] Figure 1 An exemplary embodiment of the synthetic route for the 2-ureido-4(1H)-pyrimidinone derivative of the present invention is shown. Detailed Implementation

[0045] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0047] Example 1

[0048] In an exemplary embodiment of the present invention, the corrosion-resistant polytetrafluoroethylene composite material, by weight, comprises 90 parts of modified PTFE matrix, 5 parts of boron nitride nanosheets with a thickness of 3 nm, 8 parts of graphene / PTFE core-shell powder with a graphene coating rate of 50%, 5 parts of perfluoropolyether oil with a molecular weight of 3000, 10 parts of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and 0.5 parts of antioxidant 168.

[0049] The modified PTFE matrix includes 90 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 20 parts of polyphenylene sulfide fiber, and 8 parts of 2-ureido-4(1H)-pyrimidinone derivative (synthesis reference for 2-ureido-4(1H)-pyrimidinone derivative). Figure 1 As shown, R1 is methyl, R2 is n-butyl), 5 parts of aminopropylheptaisobutylsilsesquioxane, and 1 part of zirconate coupling agent.

[0050] The preparation method of modified PTFE matrix includes the following steps: S1: grafting perfluorooctyl carboxylic acid onto polyphenylene sulfide fiber under 150W plasma to obtain pretreated polyphenylene sulfide fiber with a grafting rate of 3%;

[0051] S2: 150 parts deionized water, 0.4 parts ammonium perfluorooctanoate, 1 part paraffin stabilizer, and a small amount of perfluoropropyl vinyl ether (3% of the total mass of 7 parts perfluoropropyl vinyl ether) are mixed, vacuumed, and cooled. A small amount of tetrafluoroethylene (5% of the total mass of 90 parts tetrafluoroethylene) is added, and then the temperature is raised to 65°C. Under a pressure of 2 MPa, the remaining tetrafluoroethylene and perfluoropropyl vinyl ether are continuously introduced while stirring. 0.2 parts ammonium persulfate are added to carry out the copolymerization reaction. After washing, filtering, and drying at 150°C, a white powder of perfluoropropyl vinyl ether copolymerized modified PTFE is obtained. The melting point of the perfluoropropyl vinyl ether copolymerized modified PTFE is 300°C, and the viscosity is 10. 5 Pa.s.

[0052] PTFE modified by perfluoropropyl vinyl ether copolymerization was blended with 2-ureido-4(1H)-pyrimidinone derivative, aminopropylheptaisobutylsilsesquioxane and coupling agent to obtain a mixed powder.

[0053] S3: Mix the mixed powder and pretreated polyphenylene sulfide fiber, and perform hot pressing infiltration at 180℃ and 12MPa;

[0054] S4: The material after hot pressing and infiltration is first sintered at 230℃ for 1 hour, then heated to 300℃ for 2 hours, and then heated to 360℃ for 2 hours to obtain the modified PTFE matrix.

[0055] The processing method for corrosion-resistant polytetrafluoroethylene composite materials includes the following steps:

[0056] (1) The modified PTFE matrix and the tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer were premixed at 70°C to obtain a premix;

[0057] (2) Boron nitride nanosheets were ultrasonically dispersed in perfluoropolyether oil, then mixed with premixed material, and then graphene / PTFE core-shell powder and antioxidant 168 were added and blended at 300℃. The mixture was then molded at 10℃ and 50MPa. First, it was sintered at 230℃ for 1h, then heated to 300℃ for 2h, and then heated to 350℃ for 2h to obtain corrosion-resistant polytetrafluoroethylene composite material.

[0058] Example 2

[0059] In an exemplary embodiment of the present invention, the corrosion-resistant polytetrafluoroethylene composite material comprises, by weight, 110 parts of modified PTFE matrix, 10 parts of boron nitride nanosheets with a thickness of 4 nm, 15 parts of graphene / PTFE core-shell powder with a graphene coating rate of 80%, 10 parts of perfluoropolyether oil with a molecular weight of 4000, 15 parts of nylon elastomer, and 1 part of antioxidant 1010.

[0060] The modified PTFE matrix includes 100 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 25 parts of polyphenylene sulfide fiber, and 12 parts of 2-ureido-4(1H)-pyrimidinone derivative (synthesis reference for 2-ureido-4(1H)-pyrimidinone derivative). Figure 1 As shown, R1 is methyl, R2 is n-butyl), 10 parts of aminopropylheptaisobutylsilsesquioxane, and 1 part of zirconate coupling agent.

[0061] The preparation method of modified PTFE matrix includes the following steps: S1: grafting perfluorooctyl carboxylic acid onto polyphenylene sulfide fiber under 160W plasma to obtain pretreated polyphenylene sulfide fiber with a grafting rate of 7%;

[0062] S2: 200 parts deionized water, 1 part ammonium perfluorooctanoate, 2 parts paraffin stabilizer, and a small amount of perfluoropropyl vinyl ether (3% of the total mass of 10 parts perfluoropropyl vinyl ether) are mixed, vacuumed, and cooled. A small amount of tetrafluoroethylene (5% of the total mass of 95 parts tetrafluoroethylene) is added, and then the temperature is raised to 75°C. Under a pressure of 3 MPa, the remaining tetrafluoroethylene and perfluoropropyl vinyl ether are continuously introduced while stirring. 0.5 parts of ammonium persulfate are added to carry out the copolymerization reaction. After washing, filtering, and drying at 150°C, a white powder of perfluoropropyl vinyl ether copolymerized modified PTFE is obtained. The melting point of the perfluoropropyl vinyl ether copolymerized modified PTFE is 290°C, and the viscosity is 10. 5 Pa.s.

[0063] PTFE modified by perfluoropropyl vinyl ether copolymerization was blended with 2-ureido-4(1H)-pyrimidinone derivative, aminopropylheptaisobutylsilsesquioxane and coupling agent to obtain a mixed powder.

[0064] S3: Mix the mixed powder and pretreated polyphenylene sulfide fiber, and perform hot pressing infiltration at 200℃ and 17MPa;

[0065] S4: The material after hot pressing and infiltration is first sintered at 230℃ for 1 hour, then sintered at 320℃ for 2 hours, and then sintered at 380℃ for 2 hours to obtain the modified PTFE matrix.

[0066] The processing method for corrosion-resistant polytetrafluoroethylene composite materials includes the following steps:

[0067] (1) The modified PTFE matrix and the tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer were premixed at 70°C to obtain a premix;

[0068] (2) Boron nitride nanosheets were ultrasonically dispersed in perfluoropolyether oil, then mixed with premixed material, and then graphene / PTFE core-shell powder and antioxidant were added and blended at 290°C. The mixture was then molded at 30°C and 90MPa. First, it was sintered at 230°C for 1 hour, then heated to 300°C for 2 hours, and then heated to 350°C for 2 hours to obtain corrosion-resistant polytetrafluoroethylene composite material.

[0069] Example 3

[0070] In an exemplary embodiment of the present invention, the corrosion-resistant polytetrafluoroethylene composite material comprises, by weight, 95 parts of modified PTFE matrix, 7 parts of boron nitride nanosheets with a thickness of 2 nm, 10 parts of graphene / PTFE core-shell powder with a graphene coating rate of 90%, 8 parts of perfluoropolyether oil with a molecular weight of 4000, 12 parts of nylon elastomer, and 1 part of antioxidant 1010.

[0071] The modified PTFE matrix includes 94 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 22 parts of polyphenylene sulfide fiber, and 9 parts of 2-ureido-4(1H)-pyrimidinone derivative (synthesis reference for 2-ureido-4(1H)-pyrimidinone derivative). Figure 1 As shown, R1 is methyl, R2 is n-butyl), 7 parts of aminopropylheptaisobutylsilsesquioxane, and 2 parts of zirconate coupling agent.

[0072] The preparation method of modified PTFE matrix includes the following steps: S1: grafting perfluorooctyl carboxylic acid onto polyphenylene sulfide fiber under 150W plasma to obtain pretreated polyphenylene sulfide fiber with a grafting rate of 5%;

[0073] S2: 150 parts deionized water, 0.8 parts ammonium perfluorooctanoate, 2 parts paraffin stabilizer, and a small amount of perfluoropropyl vinyl ether (3% of the total mass of 9 parts perfluoropropyl vinyl ether) are mixed, vacuumed, and cooled. A small amount of tetrafluoroethylene (5% of the total mass of 90 parts tetrafluoroethylene) is added, and then the temperature is raised to 70°C. Under a pressure of 3 MPa, the remaining tetrafluoroethylene and perfluoropropyl vinyl ether are continuously introduced while stirring. 0.5 parts ammonium persulfate are added to carry out the copolymerization reaction. After washing, filtering, and drying at 150°C, a white powder of perfluoropropyl vinyl ether copolymerized modified PTFE is obtained. The melting point of the perfluoropropyl vinyl ether copolymerized modified PTFE is 280°C, and the viscosity is 10. 4 Pa.s.

[0074] PTFE modified by perfluoropropyl vinyl ether copolymerization was blended with 2-ureido-4(1H)-pyrimidinone derivative, aminopropylheptaisobutylsilsesquioxane and coupling agent to obtain a mixed powder.

[0075] S3: Mix the mixed powder and pretreated polyphenylene sulfide fiber, and perform hot pressing infiltration at 200℃ and 17MPa;

[0076] S4: The material after hot pressing and infiltration is first sintered at 250℃ for 1 hour, then heated to 320℃ for 2 hours, and then heated to 380℃ for 2 hours to obtain the modified PTFE matrix.

[0077] The processing method for corrosion-resistant polytetrafluoroethylene composite materials includes the following steps:

[0078] (1) The modified PTFE matrix and the tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer were premixed at 70°C to obtain a premix;

[0079] (2) Boron nitride nanosheets were ultrasonically dispersed in perfluoropolyether oil, then mixed with premix, and then graphene / PTFE core-shell powder and antioxidant were added and blended at 290°C. The mixture was then molded at 30°C and 70MPa. First, it was sintered at 240°C for 1 hour, then heated to 300°C for 2 hours, and then heated to 320°C for 2 hours to obtain corrosion-resistant polytetrafluoroethylene composite material.

[0080] Example 4

[0081] Based on Example 3, the main difference is that the modified PTFE matrix includes 97 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 24 parts of polyphenylene sulfide fiber, 10 parts of 2-ureido-4(1H)-pyrimidinone derivative, 7 parts of aminopropyl heptaisobutylsilsesquioxane, and 2 parts of zirconate coupling agent. Other steps are the same as in Example 3.

[0082] Example 5

[0083] The main difference from Example 3 is that the lubricant is graphene / PTFE core-shell powder with a graphene coating rate of 98%. The other steps are the same as in Example 3.

[0084] Comparative Example 1

[0085] Based on Example 1, the main difference is that no 2-ureido-4(1H)-pyrimidinone derivative was added during the preparation of the modified PTFE matrix; the other steps are the same as in Example 1.

[0086] Comparative Example 2

[0087] The main difference from Example 1 is that aminopropylheptaisobutylsilsesquioxane was not added during the preparation of the modified PTFE matrix. All other steps were the same as in Example 1.

[0088] Comparative Example 3

[0089] The main difference from Example 1 is that no polyphenylene sulfide fiber was added during the preparation of the modified PTFE matrix. The other steps are the same as in Example 1.

[0090] Test case

[0091] The corrosion-resistant polytetrafluoroethylene composite materials prepared in the examples and comparative examples were subjected to performance tests, and the test results are shown in Table 1.

[0092] Temperature resistance test: After aging the corrosion-resistant polytetrafluoroethylene composite material at 200℃ for 168 hours, the tensile strength retention rate was tested.

[0093] Acid resistance test: The corrosion-resistant polytetrafluoroethylene composite material was immersed in 98% concentrated sulfuric acid at 100°C for 70 hours, and the absolute value of the change rate of tensile strength was measured.

[0094] Alkali resistance test: The corrosion-resistant polytetrafluoroethylene composite material was immersed in a 70% sodium hydroxide solution at 100°C for 70 hours, and the absolute value of the change rate of tensile strength was measured.

[0095] Wear resistance: Uses MZ-4061 Akron abrasive grinding machine. Main technical specifications: Force on the rubber wheel is 26.7N; rotational speed of the rubber wheel shaft is 76±2rpm; rotational radius of the grinding wheel shaft is 34±1cm; angle between the rubber wheel shaft and the grinding wheel shaft is 0-45°; power supply voltage is AC220V±10%V.

[0096] Test steps: (1) Fix the glued sample on the return shaft, turn on the power of the electronic counter, turn on the power switch, adjust the preset number button to 600 revolutions, press "start" to start pre-grinding, pre-grind for 15 minutes, when the count reaches the preset value, press the "zero" button, remove the glued sample, weigh it with a balance, and record it as mass A1, accurate to 0.01g.

[0097] (2) Fix the pre-ground rubber wheel on the rubber wheel shaft, adjust the preset number key to 3000 revolutions, test mileage 1.5km, and conduct the test. After the test, remove the sample, brush off the rubber debris, weigh it within 1 hour, and record it as mass A2, accurate to 0.01g.

[0098] (3) Calculate the wear amount: Wear amount = A1 - A2 (g).

[0099] Table 1

[0100]

[0101]

[0102] Referring to Table 1, the corrosion-resistant PTFE composite material exhibits good temperature resistance, with a tensile strength retention rate of not less than 85% at temperatures not lower than 200℃. It also demonstrates good high-temperature corrosion resistance, with a tensile strength change rate not exceeding 3.5% under acidic conditions and not exceeding 6.5% under alkaline conditions. Furthermore, it exhibits good wear resistance, with an abrasion loss not exceeding 0.3g. Finally, it possesses excellent mechanical properties and wear resistance.

[0103] In summary, the corrosion-resistant polytetrafluoroethylene composite material of the present invention can be applied to the air bladder material of the air bladder pump, which can improve the corrosion resistance, mechanical strength and wear resistance of the air bladder at high temperatures.

[0104] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A corrosion-resistant polytetrafluoroethylene composite material, characterized in that, By weight, it includes 90-110 parts of modified PTFE matrix, 5-10 parts of thermal conductivity enhancer, 8-15 parts of lubricant, 5-10 parts of processing aid, 10-15 parts of toughening agent, and 0.5-2 parts of antioxidant. The preparation method of the modified PTFE matrix includes PTFE copolymerized with perfluoropropyl vinyl ether, polyphenylene sulfide fiber, 2-ureido-4(1H)-pyrimidinone derivative, coupling agent, and modified with aminopropylheptaisobutylsilsesquioxane.

2. The corrosion-resistant polytetrafluoroethylene composite material according to claim 1, characterized in that, By weight, 90-100 parts of perfluoropropyl vinyl ether copolymerized modified PTFE, 20-25 parts of polyphenylene sulfide fiber, 8-12 parts of 2-ureido-4(1H)-pyrimidinone derivative, 5-10 parts of aminopropyl heptaisobutylsilsesquioxane, and 1-3 parts of coupling agent.

3. The corrosion-resistant polytetrafluoroethylene composite material according to claim 2, characterized in that, The preparation method of the modified PTFE matrix includes the following steps: S1: Polyphenylene sulfide fibers are grafted with perfluorooctyl carboxylic acid using plasma to obtain pretreated polyphenylene sulfide fibers; S2: Perfluoropropyl vinyl ether copolymerized modified PTFE is added to 2-ureido-4(1H)-pyrimidinone derivative, aminopropyl heptaisobutylsilsesquioxane and coupling agent for blending to obtain mixed powder; S3: Mix the mixed powder and pretreated polyphenylene sulfide fiber, and perform hot-press infiltration at 180-220℃ and 12-18MPa; S4: The hot-pressed infiltration material is subjected to gradient sintering at a temperature of 230-400℃ to obtain a modified PTFE matrix.

4. The corrosion-resistant polytetrafluoroethylene composite material according to claim 3, characterized in that, Step S4, gradient sintering, includes the following steps: First, sinter at 230-270℃ for 1-2 hours, then raise the temperature to 300-340℃ for 1-2 hours, and then raise the temperature to 360-400℃ for 2-3 hours.

5. The corrosion-resistant polytetrafluoroethylene composite material according to claim 1, characterized in that, The melting point of perfluoropropyl vinyl ether copolymerized modified PTFE is not higher than 300℃, and the melt viscosity is not higher than 10. 5 Pa.s.

6. The corrosion-resistant polytetrafluoroethylene composite material according to claim 1, characterized in that, The preparation method of perfluoropropyl vinyl ether copolymerized modified PTFE includes the following steps: Deionized water, emulsifier, stabilizer and a small amount of perfluoropropyl vinyl ether are mixed, vacuumed and cooled, a small amount of tetrafluoroethylene is added, and then the temperature is raised to 65-75℃. Under a pressure of 2-3MPa, the remaining tetrafluoroethylene and the remaining perfluoropropyl vinyl ether are continuously introduced while stirring. An initiator is added to carry out a copolymerization reaction to obtain perfluoropropyl vinyl ether copolymerized modified PTFE.

7. The corrosion-resistant polytetrafluoroethylene composite material according to claim 1, characterized in that, The thermal conductivity enhancer is boron nitride nanosheets; And / or the lubricant is one or more of fluorine, wax, and silicone; further, the lubricant is graphene / PTFE core-shell powder, with a graphene coating rate of not less than 80%; And / or the processing aid is perfluoropolyether oil with a molecular weight of 3000-5000; And / or the toughening agent is one or more of nylon elastomers, epoxy toughening agents, or tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers; And / or the antioxidant is one or more of the following: copper salt antioxidants, phosphate antioxidants, hindered phenolic antioxidants, phosphite antioxidants, thioester antioxidants, and polymeric antioxidants; And / or the coupling agent is one or more of zirconate coupling agents, silane coupling agents, and aluminate coupling agents.

8. A method for processing the corrosion-resistant polytetrafluoroethylene composite material as described in any one of claims 1-7, characterized in that, The processing method includes the following steps: (1) The modified PTFE matrix and toughening agent are premixed at a certain temperature to obtain a premixed material; (2) The thermal conductivity enhancer is dispersed in the processing aid, then mixed with the premix, and then lubricant and antioxidant are added for blending. The mixture is then molded and sintered at high temperature to obtain a corrosion-resistant polytetrafluoroethylene composite material.

9. The processing method according to claim 8, characterized in that, Step (1) The premixing temperature shall not exceed 80℃; And / or the mixing temperature in step (2) is 200-300℃; And / or the compression molding temperature is 10-30℃, and the pressure is 50-100MPa; And / or the sintering temperature is 230-350℃.

10. The application of a corrosion-resistant polytetrafluoroethylene composite material as described in any one of claims 1-7 in a wind pump.

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