Diaphragm pump diaphragm with high fatigue resistance and preparation method thereof

Abstract

The invention discloses a diaphragm pump diaphragm with high fatigue resistance and a preparation method thereof, and belongs to the technical field of preparation of diaphragms for diaphragm pumps. The diaphragm comprises a corrosion-resistant layer and an elastic base layer, wherein the corrosion-resistant layer comprises 100 parts of ternary fluorine rubber, 10-15 parts of methyl divinyl silicone rubber, 5-8 parts of ethylene propylene diene monomer, 5-10 parts of perfluoroolefin monomer containing double bonds, 5-10 parts of allyl carbonate compound, 3-5 parts of cross-linking curing agent, 1-2 parts of vulcanizing agent, 3-5 parts of anti-aging agent and 0.2-0.5 part of accelerant; the elastic base layer comprises 100 parts of ternary fluorine rubber, 25-30 parts of methyl divinyl silicone rubber, 10-15 parts of ethylene propylene diene monomer, 10-15 parts of allyl methacrylate, 10-15 parts of an allyl carbonate compound, 3-5 parts of a cross-linking curing agent, 1-2 parts of a vulcanizing agent, 3-5 parts of an anti-aging agent and 0.2-0.5 part of an accelerant. The diaphragm of the diaphragm pump has high corrosion resistance and high flexure resistance, the creep difference between the corrosion-resistant layer and the elastic base layer can be reduced, the cross stress at the layer interface is reduced, and delamination is avoided.

Description

Technical Field

[0001] The present application relates to a diaphragm pump diaphragm with high fatigue resistance and a preparation method thereof, belonging to the technical field of diaphragm preparation for diaphragms of diaphragms. Background Art

[0002] The diaphragm pump is a commonly used fluid conveying device. It relies primarily on the reciprocating motion of the diaphragm, causing the left and right cavities of the diaphragm to alternately expand and contract, creating a pressure differential. This allows the medium to be drawn in and out. This alternating cycle between the left and right cavities completes the delivery of the medium. Therefore, the diaphragm is the primary working component, both conveying the medium and ensuring a tight seal. Preventing leakage is crucial to the proper operation and performance of the diaphragm pump.

[0003] Since the diaphragm is a component that is in direct contact with the medium, the material of the diaphragm is usually selected according to the characteristics of the conveying medium, such as nitrile rubber, fluororubber, polytetrafluoroethylene, etc. This enables the diaphragm pump to adapt to various media of different properties, including corrosive, viscous, granular and other media.

[0004] Fluororubber is highly chemically stable, offering excellent resistance to most acids, alkalis, salts, and organic solvents. This allows fluororubber diaphragms to maintain stable performance when exposed to various corrosive media, making them less susceptible to corrosion and damage, thereby extending the diaphragm's service life and making it suitable for corrosive environments such as chemical processing, electroplating, and water treatment. However, due to the presence of fluorine atoms and the relatively high rigidity of the molecular chain, fluororubber's flexural resistance is generally compromised. When subjected to repeated bending and stretching, fluororubber is more susceptible to fatigue, cracking, and even fracture. Therefore, to extend the service life of fluororubber diaphragms, additives are often added to enhance their flexural resistance.

[0005] For example, patent CN119017796A discloses a diaphragm pump diaphragm that is resistant to bending and pressure. The diaphragm prepared therefrom has a three-layer structure. By inserting a fiber woven mesh fabric into the elastic side body and combining the elastic side body with a wear-resistant surface body, the diaphragm's pressure resistance, bending resistance, and fatigue resistance are improved. However, the raw materials used in its preparation are very different between the elastic side body, the pressure-resistant intermediate body, and the wear-resistant surface body, resulting in different creep properties of each layer. When the diaphragm reciprocates, the degree of deformation of each layer will vary, thereby generating cross stress at the interface between the layers. Even if the strength of each layer of material can withstand this stress, due to the different creep properties of each layer, the cooperative deformation ability between the layers will gradually decrease, which will cause stress concentration in the long run. As the number of movements increases, stress concentration continues to accumulate, and microcracks will appear at the interface due to fatigue. These microcracks gradually expand, and when they exceed the bonding strength of the interface, they will cause delamination.

[0006] Therefore, there is an urgent need for a diaphragm pump diaphragm that is highly fatigue-resistant and not prone to delamination. Summary of the Invention

[0007] In order to solve the above problems, a diaphragm pump diaphragm with high fatigue resistance is provided. The corrosion-resistant layer and elastic base layer of the diaphragm pump diaphragm both use three types of rubber as the base material, which can ensure the basic mechanical properties of the diaphragm. The perfluoroolefin monomer and allyl carbonate compounds containing double bonds added to the corrosion-resistant layer can improve the corrosion resistance and flexural resistance of the corrosion-resistant layer. The allyl carbonate compounds are simultaneously added to the elastic base layer, which can reduce the creep difference between the corrosion-resistant layer and the elastic base layer, reduce the cross stress at the layer interface, and improve the bonding strength of the two layers, thereby avoiding delamination of the diaphragm.

[0008] According to one aspect of the present application, there is provided a diaphragm pump diaphragm with high fatigue resistance, comprising a corrosion-resistant layer and an elastic base layer, wherein the corrosion-resistant layer and the elastic base layer are bonded together by an adhesive, wherein;

[0009] The corrosion-resistant layer comprises, by weight, 100 parts of ternary fluororubber, 10-15 parts of methyl divinyl silicone rubber, 5-8 parts of ethylene propylene diene monomer, 5-10 parts of perfluoroolefin monomer containing double bonds, 5-10 parts of allyl carbonate compounds, 3-5 parts of cross-linking curing agent, 1-2 parts of vulcanizing agent, 3-5 parts of antioxidant, and 0.2-0.5 parts of accelerator;

[0010] The elastic base layer includes 100 parts of ternary fluororubber, 25-30 parts of methyl divinyl silicone rubber, 10-15 parts of ethylene propylene diene monomer rubber, 10-15 parts of allyl methacrylate, 10-15 parts of allyl carbonate compounds, 3-5 parts of crosslinking curing agent, 1-2 parts of vulcanizing agent, 3-5 parts of antioxidant, and 0.2-0.5 parts of accelerator.

[0011] Since the diaphragm pump diaphragm of the diaphragm pump of the present application adopts a base material of three rubber materials, among which ternary fluororubber is the main one, in order to ensure the corrosion resistance of the diaphragm base, the three rubber materials cooperate with each other to improve the mechanical properties of the corrosion-resistant layer and the elastic base layer of the diaphragm, and give it basic anti-flexibility. Then, under the composition of the above rubber materials, the applicant found that the flexibility performance needs to be improved, especially when transporting highly corrosive media, the flexibility performance of the diaphragm will be lower. It is speculated that the reason is that the corrosion-resistant layer is more susceptible to corrosion, so the flexibility performance decreases faster. Therefore, the present application adds two substances, perfluoroolefin monomer and allyl carbonate compound, to the corrosion-resistant layer, which can participate in the cross-linking of the rubber substrate during the vulcanization of the corrosion-resistant layer, so that the corrosion resistance and anti-flexibility of the corrosion-resistant layer are significantly improved. However, the addition of these two substances to the corrosion-resistant layer will increase the creep difference between the corrosion-resistant layer and the elastic base layer. Therefore, the present application also adds allyl carbonate compounds to the elastic base layer to reduce the difference between the corrosion-resistant layer and the elastic base layer.

[0012] In addition, the applicant also found that when a perfluoroolefin monomer containing a double bond is also added to the elastic base layer, although the creep difference between the corrosion-resistant layer and the elastic base layer will further decrease, the elasticity of the elastic base layer will decrease, and the diaphragm will not be able to effectively reciprocate. Therefore, only allyl carbonate compounds are added to the elastic base layer, and allyl methacrylate is also added as a compatibilizer to increase the compatibility of the allyl carbonate compounds with the rubber substrate, so as to improve the elasticity of the elastic base layer and facilitate long-term reciprocating motion of the diaphragm.

[0013] Optionally, the allyl carbonate compound includes at least one of allyl methyl carbonate, allyl ethyl carbonate, allyl diglycol dicarbonate, and allyl succinimidyl carbonate.

[0014] The above-mentioned allyl carbonate compounds can improve the fatigue resistance of the diaphragm and reduce the risk of delamination of the corrosion-resistant layer and the elastic base layer.

[0015] Optionally, the allyl carbonate compound is selected from allyl diglycol dicarbonate and allyl succinimidyl carbonate in a weight ratio of 2:1.

[0016] The above-mentioned two allyl carbonate compounds in a specific weight ratio can, firstly, adjust the cross-linking degree of the rubber substrate to make it moderately cross-linked, avoid excessive rigidity of the diaphragm, and improve the long-term reciprocating ability of the diaphragm; secondly, the succinimide group contained in the allyl succinimidyl carbonate can react with the epoxy adhesive to improve the bonding effect with the adhesive, thereby improving the interfacial bonding force between the two layers, and realizing deformation synchronously in subsequent deformation; thirdly, it can improve the elasticity of the rubber substrate, thereby ensuring that the diaphragm can still rebound quickly during multiple reciprocating motions.

[0017] Optionally, the weight ratio of the perfluoroolefin monomer containing a double bond to the allyl carbonate compound in the corrosion-resistant layer is (1.5-2):1.

[0018] The weight ratio of the two substances will affect the corrosion resistance and fatigue resistance of the corrosion-resistant layer. The applicant has found that the above ratio can further improve both the corrosion resistance and fatigue resistance.

[0019] Optionally, the weight ratio of allyl methacrylate to allyl carbonate compounds in the elastic base layer is 1.5:1.

[0020] Compared with allyl carbonate compounds, the addition of allyl methacrylate can serve as a compatibilizer to increase the compatibility of allyl carbonate compounds with the rubber substrate, and the substance can also participate in the cross-linking reaction of the rubber. Its addition can improve the aging resistance and elasticity of the elastic base layer.

[0021] Optionally, the perfluoroolefin monomer containing a double bond is selected from tetrafluoroethylene or hexafluoropropylene.

[0022] The selection of the above substances can reduce production costs and facilitate industrial production.

[0023] Optionally, the cross-linking curing agent is a peroxide.

[0024] Optionally, the cross-linking curing agent is selected from at least one of benzoyl peroxide, diisopropyl benzene peroxide, di-tert-butyl peroxide, tert-butyl isopropyl peroxide, methyl ethyl ketone peroxide, isopropyl benzene hydroperoxide, 2,5-dimethyl-2,5-di(tert-butyl peroxy)hexane, 2,5-dimethyl-2,5-di(benzoyl peroxy)hexane, 2,5-dimethyl-2,5-di(tert-butyl peroxy)hexane, 1,3-bis(tert-butyl peroxypropyl)benzene, di-tert-butyl peroxide diisopropyl benzene, tert-butyl peroxybenzene, 2,4-dichlorobenzoyl peroxide, 1,1-di-tert-butyl peroxy-3,3,5-trimethylsiloxane, and n-butyl-4,4-di-tert-butyl peroxyvalerate.

[0025] Optionally, the vulcanizing agent is selected from sulfur.

[0026] Optionally, the antioxidant includes but is not limited to at least one of antioxidant RD, antioxidant 4010, antioxidant 4010NA, antioxidant ODA, antioxidant AW, antioxidant MB, antioxidant MC, and antioxidant NBC.

[0027] Optionally, the adhesive is an epoxy adhesive.

[0028] Optionally, the adhesive comprises, by weight, a water-based epoxy resin and a curing agent, wherein the curing agent accounts for 3%-6% of the weight of the epoxy resin.

[0029] Optionally, the curing agent is selected from triethylamine.

[0030] Optionally, the accelerator is selected from at least one of thiazoles, thiocarbamoyls, and guanidines.

[0031] Optionally, the above-mentioned thiazole accelerators include but are not limited to 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, zinc salt of 2-mercaptobenzothiazole, copper salt of 2-mercaptobenzothiazole, cyclohexylamine salt of 2-mercaptobenzothiazole, 2-(2,4-dinitrophenyl)mercaptobenzothiazole, and 2-(2,6-diethyl-4-morpholinylthio)benzothiazole.

[0032] Optionally, the above-mentioned thiocarbamyl accelerators include but are not limited to tetramethylthiocarbamyl disulfide, tetraethylthiocarbamyl disulfide, tetramethylthiocarbamyl monosulfide, dipentamethylenethiocarbamyl disulfide, dipentamethylenethiocarbamyl disulfide, dipentamethylenethiocarbamyl tetrasulfide, dipentamethylenethiocarbamyl hexasulfide, tetrabutylthiocarbamyl disulfide, and pentamethylenethiocarbamyl tetrasulfide.

[0033] Optionally, the guanidine accelerators include but are not limited to diphenylguanidine, di-o-tolylguanidine, triphenylguanidine, di-o-tolylguanidine, and diphenylguanidine phthalate.

[0034] According to a second aspect of the present application, there is provided a method for preparing a diaphragm pump diaphragm with high fatigue resistance as described in any one of the above, comprising the following steps:

[0035] S1: mixing the materials of the corrosion-resistant layer and the elastic base layer respectively to obtain the corrosion-resistant layer and the elastic base layer, and leaving them for 24 to 48 hours;

[0036] S2: applying an adhesive to one side of the corrosion-resistant layer or the elastic base layer, and bonding them by a hot vulcanization process to obtain the diaphragm pump diaphragm with high fatigue resistance.

[0037] Optionally, the steps of the hot vulcanization process are: vulcanization at 140-150° C. and 8-10 MPa for 10-15 minutes; and then baking at 170-180° C. for 1-2 hours.

[0038] The beneficial effects of this application include but are not limited to:

[0039] 1. According to the diaphragm pump diaphragm with high fatigue resistance of the present application, the perfluoroolefin monomer and allyl carbonate compound containing double bonds in the corrosion-resistant layer can participate in the cross-linking reaction of the rubber and form a cross-linked network with a moderate degree of cross-linking with the rubber substrate, thereby improving the mechanical properties of the corrosion-resistant layer, especially the flexural resistance is significantly improved, and because the perfluoroolefin monomer contains a large number of fluorine atoms, the corrosion-resistant layer can maintain good corrosion resistance.

[0040] 2. According to the diaphragm pump diaphragm with high fatigue resistance of the present application, allyl carbonate compounds are simultaneously added to the elastic base layer, which can also participate in the cross-linking reaction in the elastic base layer. Since both the elastic base layer and the corrosion-resistant layer contain this substance, the strain consistency of the elastic base layer and the corrosion-resistant layer can be improved when the diaphragm moves, thereby reducing the creep difference between the corrosion-resistant layer and the elastic base layer, and avoiding diaphragm delamination.

[0041] 3. According to the diaphragm pump diaphragm with high fatigue resistance of the present application, the allyl carbonate compound is selected from allyl diglycol dicarbonate and allyl succinimidyl carbonate in a weight ratio of 2:1, which can make the corrosion-resistant layer and the elastic base layer and the epoxy group in the adhesive react to form a chemical connection, thereby further improving the interfacial bonding strength of the corrosion-resistant layer and the elastic base layer, improving creep consistency, and extending the service life of the diaphragm.

[0042] 4. According to the diaphragm pump diaphragm with high fatigue resistance of the present application, the perfluoroolefin monomer and allyl carbonate compound containing double bonds in the corrosion-resistant layer can adjust the cross-linking density of the cross-linked network in the corrosion-resistant layer to obtain a corrosion-resistant layer with optimal mechanical properties.

[0043] 5. According to the diaphragm pump diaphragm with high fatigue resistance of the present application, allyl methacrylate and allyl carbonate compounds in the elastic base layer can also adjust the cross-linking density of the cross-linked network in the elastic base layer to obtain an elastic base layer whose mechanical properties match those of the corrosion-resistant layer, thereby reducing the mechanical differences between the corrosion-resistant layer and the elastic base layer, thereby ensuring the consistency of the reciprocating motion of the two layers of the diaphragm during long-term reciprocating motion.

[0044] 6. According to the diaphragm pump diaphragm with high fatigue resistance of the present application, the overall flexural resistance can be improved by improving the corrosion-resistant layer and the elastic base layer, thereby improving the fatigue resistance of the diaphragm. It can also reduce the creep differences of each layer, improve the collaborative deformation ability between layers, reduce interfacial stress, and improve the interlayer bonding force, so that the diaphragm has the characteristics of high fatigue resistance and non-delamination. DETAILED DESCRIPTION

[0045] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0046] Unless otherwise specified, the raw materials used in the examples and comparative examples of this application were purchased commercially. In the following specific examples, benzoyl peroxide was selected as the crosslinking curing agent, sulfur was selected as the vulcanizing agent, antioxidant RD was selected as the antioxidant, 2-mercaptobenzothiazole (MBT) was selected as the accelerator, and a water-based epoxy resin and a curing agent were selected as the binder, wherein the curing agent accounted for 5% by weight of the epoxy resin. The selection of these raw materials does not constitute a limitation to this application; the technical effects of this application can be achieved by using other materials.

[0047] Unless otherwise specified, the methods used in the examples and comparative examples of the present application are conventional methods in the prior art.

[0048] Example 1

[0049] This embodiment relates to a diaphragm pump diaphragm with high fatigue resistance and a preparation method thereof. The diaphragm pump diaphragm comprises a corrosion-resistant layer and an elastic base layer, wherein the corrosion-resistant layer and the elastic base layer are bonded by an adhesive, wherein;

[0050] The corrosion-resistant layer comprises, by weight, 100 parts of ternary fluororubber, 10 parts of methyl divinyl silicone rubber, 8 parts of ethylene propylene diene monomer rubber, 10 parts of hexafluoropropylene, 10 parts of allyl methyl carbonate, 5 parts of cross-linking curing agent, 2 parts of vulcanizing agent, 3 parts of antioxidant, and 0.2 parts of accelerator;

[0051] The elastic base layer includes 100 parts of ternary fluororubber, 25 parts of methyl divinyl silicone rubber, 15 parts of ethylene propylene diene monomer rubber, 10 parts of allyl methacrylate, 10 parts of allyl methyl carbonate, 3 parts of crosslinking curing agent, 2 parts of vulcanizing agent, 3 parts of antioxidant and 0.5 parts of accelerator.

[0052] The preparation method of the diaphragm pump diaphragm comprises the following steps:

[0053] S1: mixing the materials of the corrosion-resistant layer and the elastic base layer respectively to obtain the corrosion-resistant layer and the elastic base layer, and leaving them for 24 hours;

[0054] S2: Apply the adhesive to one side of the corrosion-resistant layer or elastic base layer, and vulcanize it at 140°C and 10 MPa for 15 minutes; then bake it at 170°C for 2 hours.

[0055] Example 2

[0056] This embodiment relates to a diaphragm pump diaphragm with high fatigue resistance and a preparation method thereof. The diaphragm pump diaphragm comprises a corrosion-resistant layer and an elastic base layer, wherein the corrosion-resistant layer and the elastic base layer are bonded by an adhesive, wherein;

[0057] The corrosion-resistant layer comprises, by weight, 100 parts of ternary fluororubber, 15 parts of methyl divinyl silicone rubber, 5 parts of ethylene propylene diene monomer rubber, 5 parts of tetrafluoroethylene, 5 parts of allyl ethyl carbonate, 3 parts of cross-linking curing agent, 1 part of vulcanizing agent, 5 parts of antioxidant, and 0.5 parts of accelerator;

[0058] The elastic base layer includes 100 parts of ternary fluororubber, 30 parts of methyl divinyl silicone rubber, 10 parts of ethylene propylene diene monomer rubber, 15 parts of allyl methacrylate, 15 parts of allyl ethyl carbonate, 5 parts of crosslinking curing agent, 1 part of vulcanizing agent, 5 parts of antioxidant and 0.2 parts of accelerator.

[0059] The preparation method of the diaphragm pump diaphragm comprises the following steps:

[0060] S1: mixing the materials of the corrosion-resistant layer and the elastic base layer respectively to obtain the corrosion-resistant layer and the elastic base layer, and leaving them for 48 hours;

[0061] S2: Apply the adhesive to one side of the corrosion-resistant layer or elastic base layer, vulcanize at 150°C and 8MPa for 10 minutes; then bake at 180°C for 1 hour.

[0062] Example 3

[0063] The difference between this embodiment and embodiment 2 is that the amount of tetrafluoroethylene in the corrosion-resistant layer is 7.5 parts, and the rest is the same as embodiment 2.

[0064] Example 4

[0065] The difference between this embodiment and embodiment 2 is that the amount of tetrafluoroethylene in the corrosion-resistant layer is 10 parts, and the rest is the same as embodiment 2.

[0066] Example 5

[0067] The difference between this embodiment and embodiment 2 is that the amount of allyl ethyl carbonate in the elastic base layer is 10 parts, and the rest is the same as embodiment 2.

[0068] Example 6

[0069] The difference between this embodiment and embodiment 2 is that allyl ethyl carbonate is replaced by allyl diglycol dicarbonate and allyl succinimidyl carbonate in a weight ratio of 2:1, and the rest is the same as embodiment 2.

[0070] Example 7

[0071] The difference between this embodiment and embodiment 2 is that allyl ethyl carbonate is replaced by allyl succinimidyl carbonate, and the rest is the same as embodiment 2.

[0072] Comparative Example 1

[0073] The difference between this comparative example and Example 2 is that allyl ethyl carbonate in the elastic base layer is replaced by allyl ethyl ether, and the rest is the same as Example 2.

[0074] Comparative Example 2

[0075] The difference between this comparative example and Example 2 is that tetrafluoroethylene is not added to the corrosion-resistant layer, and the rest is the same as Example 2.

[0076] Comparative Example 3

[0077] The difference between this comparative example and Example 2 is that allyl methacrylate is not added to the elastic base layer, and the rest is the same as Example 2.

[0078] Test Case

[0079] The following tests were performed on the diaphragms prepared in the above embodiments and comparative examples: tensile properties (refer to GB / T528-2009), acid and alkali corrosion resistance (refer to GB / T1690-2010), and flexural test (refer to GB / T13934-2006), and whether there was delamination when cracks appeared during the flexural test.

[0080] The results are shown in Tables 1 and 2 below.

[0081] Table 1

[0082]

[0083] Table 2

[0084]

[0085]

[0086] The foregoing is merely an embodiment of the present application, and the scope of protection of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the technical ideas and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A diaphragm pump diaphragm with high fatigue resistance, characterized in that: It comprises a corrosion-resistant layer and an elastic base layer, wherein the corrosion-resistant layer and the elastic base layer are bonded by an adhesive, wherein; The corrosion-resistant layer comprises, by weight, 100 parts of ternary fluororubber, 10-15 parts of methyl divinyl silicone rubber, 5-8 parts of ethylene propylene diene monomer, 5-10 parts of perfluoroolefin monomer containing double bonds, 5-10 parts of allyl carbonate compounds, 3-5 parts of cross-linking curing agent, 1-2 parts of vulcanizing agent, 3-5 parts of antioxidant, and 0.2-0.5 parts of accelerator; The elastic base layer includes 100 parts of ternary fluororubber, 25-30 parts of methyl divinyl silicone rubber, 10-15 parts of ethylene propylene diene monomer rubber, 10-15 parts of allyl methacrylate, 10-15 parts of allyl carbonate compounds, 3-5 parts of crosslinking curing agent, 1-2 parts of vulcanizing agent, 3-5 parts of antioxidant, and 0.2-0.5 parts of accelerator.

2. The diaphragm pump diaphragm with high fatigue resistance according to claim 1, characterized in that The allyl carbonate compound includes at least one of allyl methyl carbonate, allyl ethyl carbonate, allyl diethylene glycol dicarbonate, and allyl succinimidyl carbonate.

3. The diaphragm pump diaphragm with high fatigue resistance according to claim 2, characterized in that: The allyl carbonate compound is selected from allyl diethylene glycol dicarbonate and allyl succinimidyl carbonate in a weight ratio of 2:

1.

4. The diaphragm pump diaphragm with high fatigue resistance according to claim 1, characterized in that The weight ratio of the perfluoroolefin monomer containing a double bond to the allyl carbonate compound in the corrosion-resistant layer is (1.5-2):

1.

5. The diaphragm pump diaphragm with high fatigue resistance according to claim 1, characterized in that The weight ratio of allyl methacrylate to allyl carbonate compounds in the elastic base layer is 1.5:

1.

6. The diaphragm for a diaphragm pump having high fatigue resistance according to claim 1, characterized in that: The perfluoroolefin monomer containing a double bond is selected from tetrafluoroethylene or hexafluoropropylene.

7. The diaphragm pump diaphragm with high fatigue resistance according to claim 1, characterized in that The cross-linking curing agent is a peroxide; and / or The vulcanizing agent is selected from sulfur.

8. The diaphragm pump diaphragm with high fatigue resistance according to claim 1, characterized in that The adhesive is an epoxy adhesive; and / or The accelerator is selected from at least one of thiazoles, thiocarbamoyls and guanidines.

9. The method for preparing a diaphragm pump diaphragm with high fatigue resistance according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: mixing the materials of the corrosion-resistant layer and the elastic base layer respectively to obtain the corrosion-resistant layer and the elastic base layer, and leaving them for 24 to 48 hours; S2: applying an adhesive to one side of the corrosion-resistant layer or the elastic base layer, and bonding them by a hot vulcanization process to obtain the diaphragm pump diaphragm with high fatigue resistance.

10. The preparation method according to claim 9, characterized in that The steps of the hot vulcanization process are: vulcanization at 140-150° C. and 8-10 MPa for 10-15 minutes; and then baking at 170-180° C. for 1-2 hours.

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