High-temperature-resistant and corrosion-resistant diaphragm for diaphragm pump and preparation method thereof

Abstract

The invention provides a high-temperature-resistant and corrosion-resistant diaphragm for a diaphragm pump and a preparation method of the high-temperature-resistant and corrosion-resistant diaphragm, and relates to the technical field of diaphragm pumps. The high-temperature-resistant and corrosion-resistant diaphragm for the diaphragm pump comprises a base layer and a reinforcing layer, wherein the base layer and the reinforcing layer are compounded through adhesive rubber; the base layer and the reinforcing layer comprise a rubber composition, and the rubber composition comprises nitrile rubber, ethylene propylene diene monomer and methyl vinyl phenyl silicone rubber according to the mass ratio of 10: (5-8): (3-5). The high-temperature-resistant and corrosion-resistant diaphragm for the diaphragm pump, provided by the invention, has relatively high mechanical properties, acid and alkali corrosion resistance and excellent high-temperature resistance, can keep relatively high mechanical properties in a medium for a long time, prolongs the service life of the diaphragm, is relatively low in cost, and improves the defects of a current rubber diaphragm material.

Description

Technical Field

[0001] This invention relates to the field of diaphragm pump technology, and in particular to a high-temperature and corrosion-resistant diaphragm for diaphragm pumps and its preparation method. Background Technology

[0002] A diaphragm pump is a device used to transport two-phase media, including solids and liquids, or toxic and highly corrosive liquids. It is widely used in industries such as petroleum, chemical, and metallurgy. For a diaphragm pump to transport liquids, the diaphragm is one of the key components ensuring its normal operation. However, the diaphragm needs to undergo periodic reciprocating motion, which is very frequent. Once damaged, it must be replaced. Therefore, the diaphragm material must not only be resistant to various media but also maintain high mechanical properties and service life in the medium. This ensures that the diaphragm pump maintains a good sealing effect even during long-term operation, reducing the need for diaphragm replacement.

[0003] Due to the operating environment of diaphragm pumps, the most common diaphragm materials are nitrile rubber, fluororubber, and other rubber materials or rubber-woven fabrics. Nitrile rubber is relatively inexpensive and has good oil resistance, wear resistance, and aging resistance. It also exhibits good stability in oily media, but its acid resistance and high-temperature resistance are poor, making it unsuitable for prolonged use in acidic and high-temperature environments. Fluororubber has excellent high-temperature and solvent resistance, but its cost is relatively high, and its resistance to flexural dynamic fatigue is poor. Therefore, current diaphragm materials are not well-suited for the application scenarios of diaphragm pumps, necessitating the development of a new type of diaphragm material to meet the requirements of long-term operation of diaphragm pumps. Summary of the Invention

[0004] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides a high-temperature and corrosion-resistant diaphragm for diaphragm pumps and a method for preparing the same, which at least solves some of the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: On one hand, a high-temperature and corrosion-resistant diaphragm for a diaphragm pump includes a base layer and a reinforcing layer, wherein the base layer and the reinforcing layer are bonded together using adhesive rubber; wherein, The base layer and the reinforcing layer contain a rubber composition, which comprises nitrile rubber, ethylene propylene diene monomer (EPDM) rubber and methyl vinyl phenyl silicone rubber in a mass ratio of 10:(5-8):(3-5).

[0006] Preferably, the rubber composition comprises nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:7:4.

[0007] This application uses a nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:(5-8):(3-5) as a rubber composition to prepare a membrane material. For example, the mass ratio of nitrile rubber, EPDM rubber, and methyl vinyl phenyl silicone rubber in the rubber composition can be 10:5:3, 10:5:3.1, 10:5:3.2, 10:5:3.3, 10:5:3.4, 10:5:3.5, 10:5:3.6, 10:5:3.7, 10:5:3.8, 10:5:3.9, 10:5:4, 10:5:5, or 10:5.1. 3, 10:5.2:3, 10:5.3:3, 10:5.4:3, 10:5.5:3, 10:5.6:3, 10:5.7:3, 10:5.8:3, 10:5.9:3, 10:6:3, 10:6:4, 10:6:5, 10:7:3, 10:7:4, 10:7:5, 10:8:3, 10:8:4, 10:8:5, etc., or any range thereof.

[0008] Furthermore, the reinforcing layer also contains vinyltri-tert-butylperoxysilane, wherein the amount of vinyltri-tert-butylperoxysilane is 10-20% of the mass of the rubber composition.

[0009] Furthermore, the reinforcing layer also contains tetraallyl terephthalamide, wherein the amount of tetraallyl terephthalamide is 5 to 10% of the mass of the rubber composition.

[0010] Preferably, the reinforcing layer contains both vinyltri-tert-butylperoxysilane and tetraallyl terephthalamide in a mass ratio of (2-3):1. Experiments have shown that adding vinyltri-tert-butylperoxysilane and tetraallyl terephthalamide to the reinforcing layer increases the crosslinking of the reinforcing layer rubber, which helps to improve its strength and fatigue resistance. Furthermore, it has been found that the presence of vinyltri-tert-butylperoxysilane and tetraallyl terephthalamide can also improve the material's high-temperature resistance, allowing the diaphragm material to maintain good mechanical properties and extend its service life even after prolonged use in high-temperature media.

[0011] Furthermore, the base layer also contains a vulcanizing agent, an antioxidant, and an accelerator.

[0012] Furthermore, the reinforcing layer also includes a crosslinking curing agent, a vulcanizing agent, an antioxidant, and an accelerator.

[0013] Furthermore, the crosslinking curing agent is a peroxide.

[0014] Optionally, the crosslinking curing agent includes, but is not limited to, benzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, tert-butylisopropylphenyl peroxide, methyl ethyl ketone peroxide, hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,3-bis(tert-butylperoxypropyl)benzene, di-tert-butylperoxydiisopropylbenzene, tert-butylperoxybenzene, 2,4-dichlorobenzoyl peroxide, 1,1-di-tert-butylperoxy-3,3,5-trimethylsiloxane, n-butyl-4,4-di-tert-butylperoxyvalerate, etc.

[0015] Furthermore, the vulcanizing agent is selected from sulfur.

[0016] Furthermore, the antioxidants include, but are not limited to, any one or a combination of several of antioxidants RD, 4010, 4010NA, ODA, AW, MB, MC, and NBC.

[0017] Furthermore, the promoter is selected from any one or a combination of several of thiazoles, thiocarbamoyls, and guanidines.

[0018] Optionally, the above-mentioned thiazole accelerators include, but are not limited to, 2-mercaptobenzothiazole (MBT), dibenzothiazole 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-morpholinothio)benzothiazole.

[0019] Optionally, the above-mentioned thiocarbamoyl accelerators include, but are not limited to, tetramethylthiocarbamoyl disulfide, tetraethylthiocarbamoyl disulfide, tetramethylthiocarbamoyl monosulfide, dipyrylthiocarbamoyl disulfide, dipyrylthiocarbamoyl disulfide, dipyrylthiocarbamoyl tetrasulfide, dipyrylthiocarbamoyl hexasulfide, tetrabutylthiocarbamoyl disulfide, and dipyrylthiocarbamoyl tetrasulfide.

[0020] Optionally, the guanidine promoters mentioned above include, but are not limited to, diphenylguanidine, di-o-toluidine, triphenylguanidine, di-o-toluidine, and diphenylguanidine phthalate.

[0021] Furthermore, the adhesive rubber is a carboxyl-terminated liquid nitrile rubber.

[0022] Furthermore, the adhesive rubber also contains PEEK powder for reinforcement, which improves the performance of the membrane material. The PEEK powder accounts for 0 to 4% of the mass of the carboxyl-terminated liquid nitrile rubber.

[0023] Furthermore, the base layer comprises the following raw materials in parts by weight: 100 parts of rubber composition, 0.5 to 1.5 parts of vulcanizing agent, and 3 to 5 parts of antioxidant; The reinforcing layer comprises the following raw materials in parts by weight: 100 parts of rubber composition, 10-20 parts of vinyl tri-tert-butylperoxysilane, 5-10 parts of tetraallyl terephthalamide, 0.1-0.3 parts of crosslinking curing agent, 1-2 parts of vulcanizing agent, 3-5 parts of antioxidant, and 0.1-0.5 parts of accelerator; The adhesive rubber comprises the following raw materials in parts by weight: 18-25 parts of carboxyl-terminated liquid nitrile rubber and 0-1 part of PEEK powder.

[0024] Furthermore, one or more of antioxidants, plasticizers, and lubricants may be added to the reinforcing layer and base material as needed.

[0025] Optionally, the antioxidants include, but are not limited to, N-phenyl-N′-(1,3-dimethyl)-p-phenylenediamine, N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine, N-phenyl-N′-isopropyl-p-phenylenediamine, N,N′-diphenyl-p-phenylenediamine, N,N′-diaryl-p-phenylenediamine, N-phenyl-N′-cyclohexyl-p-phenylenediamine, N-phenyl-N′-octyl-p-phenylenediamine, 2,2′-methylene-bis(4-methyl-6-tert-butylphenol), 2,2′-isobutylene-bis(4,6-dimethylphenol), 2,6-di-tert-butyl-p-cresol, and 2,2,4-trimethyl-1,2-dihydroquinoline.

[0026] Optionally, the plasticizer is paraffin oil.

[0027] Optionally, the lubricant includes, but is not limited to, fatty acid amides, hydrocarbons, fatty acids, esters, alcohols, and metal soaps.

[0028] On the other hand, the method for preparing the high-temperature and corrosion-resistant diaphragm for the diaphragm pump mentioned above includes the following steps: The materials of the base layer and the reinforcing layer are mixed separately to obtain the base layer and the reinforcing layer, and left to stand for 24-48 hours; then the bonding rubber and PEEK powder are mixed and applied between the base layer and the reinforcing layer, compacted, and then bonded using a hot vulcanization process to obtain the high temperature and corrosion resistant diaphragm for the diaphragm pump.

[0029] The specific steps of the preparation method for the high-temperature and corrosion-resistant diaphragm used in the diaphragm pump are as follows: (1) Mix the raw materials of the base layer at a temperature of 130-140℃ and a pressure of 20-25MP for 2-3 minutes to obtain the base layer; (2) The rubber composition, vinyl tritert-butylperoxysilane and tetraallyl terephthalamide in the reinforcing layer raw material are plasticized 2 to 3 times at 40 to 50°C; then they are mixed with the remaining raw materials and kneaded at 135 to 145°C and 20 to 25 MPa for 2 to 3 minutes to obtain the reinforcing layer. (3) After the base layer and the reinforcing layer have been left to stand for 24 to 48 hours, the adhesive rubber and PEEK powder are dispersed and mixed and then applied between the base layer and the reinforcing layer. The mixture is then compacted by a roller press and then bonded using a hot vulcanization process to obtain the high-temperature and corrosion-resistant diaphragm for the diaphragm pump.

[0030] Further, the hot vulcanization process in step (3) is as follows: vulcanize for 10 to 15 minutes at a temperature of 140 to 150°C and a pressure of 8 to 10 MPa; and then bake at 170 to 180°C for 1 to 2 hours.

[0031] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber as the main materials to prepare a diaphragm with a double-layer structure. This diaphragm has high mechanical properties, excellent resistance to acid and alkali corrosion, and excellent high-temperature resistance. It can maintain high mechanical properties in the medium for a long time, thus extending the service life of the diaphragm. Moreover, the cost is relatively low, which improves the defects of current rubber diaphragm materials.

[0032] 2. The diaphragm material of the present invention uses nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber as the main materials. Compared with nitrile rubber alone, the combination of the three rubber materials can make up for the defects of nitrile rubber in acid resistance and high temperature resistance. The resulting diaphragm material has excellent acid and alkali corrosion resistance, high temperature resistance, and improved mechanical properties.

[0033] 3. The reinforcing layer material of the present invention also contains vinyltri-tert-butylperoxysilane and / or tetraallyl terephthalamide, which can increase the crosslinking of the reinforcing layer rubber, and help improve its mechanical properties and acid and alkali resistance; in addition, when vinyltri-tert-butylperoxysilane and tetraallyl terephthalamide are added in a specific ratio, the high temperature resistance of the material can also be improved, so that the diaphragm material can still maintain good mechanical properties and extend its service life even after long-term use in high-temperature media. Detailed Implementation

[0034] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of the present invention, but do not limit the invention in any way. The following description is merely an exemplary illustration of the scope of protection of the present invention, and those skilled in the art can make various changes and modifications to the invention based on the disclosed content, which should also fall within the scope of protection of the present invention.

[0035] Unless otherwise specified, all chemical reagents used in the embodiments of this invention were obtained through conventional commercial means.

[0036] In the following specific embodiments, the crosslinking curing agent is 2,5-dimethyl-2,5-di(tert-butylperoxide)-hexane, the antioxidant is antioxidant RD, the binder is PSA9165 silicone binder, and the accelerator is accelerator DM. The selection of the above raw materials does not constitute a limitation on this application, and other materials can achieve the technical effects of this application.

[0037] The present invention will be further described below by way of specific embodiments.

[0038] Example 1 A high-temperature and corrosion-resistant diaphragm for a diaphragm pump includes a base layer and a reinforcing layer, wherein the base layer and the reinforcing layer are bonded together with adhesive rubber; wherein... The base layer comprises the following raw materials in parts by weight: 100 parts of rubber composition, 0.5 parts of vulcanizing agent, and 3 parts of antioxidant; The reinforcing layer comprises the following raw materials in parts by weight: 100 parts of rubber composition, 10 parts of vinyl tri-tert-butylperoxysilane, 0.1 parts of crosslinking curing agent, 1 part of vulcanizing agent, 3 parts of antioxidant, and 0.1 parts of accelerator; The rubber composition comprises nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:5:3. The bonding rubber comprises the following raw materials in parts by weight: 18 parts of carboxyl-terminated liquid nitrile rubber.

[0039] The preparation method of the high-temperature and corrosion-resistant diaphragm for the above-mentioned diaphragm pump includes the following steps: (1) The raw materials for the base layer are mixed at a temperature of 130℃ and a pressure of 20MP for 3 minutes to obtain the base layer; (2) The rubber composition and vinyl tritert-butyl peroxysilane in the reinforcing layer raw material are plasticized three times at 40°C; then mixed with the remaining raw material and kneaded at 135°C and 20MPa for 3 minutes to obtain the reinforcing layer; (3) After the base layer and the reinforcing layer have been left to stand for 24 hours, the adhesive rubber is applied between the base layer and the reinforcing layer, and the roller is used to compact it. Then, the hot vulcanization process is used for bonding. The steps are: vulcanize for 15 minutes at a temperature of 140℃ and a pressure of 8MPa; then bake at 170℃ for 2 hours to obtain the high temperature and corrosion resistant diaphragm for the diaphragm pump.

[0040] Example 2 Another type of diaphragm pump uses a high-temperature and corrosion-resistant diaphragm, comprising a base layer and a reinforcing layer, with the base layer and reinforcing layer bonded together by an adhesive rubber compound; wherein, The base layer comprises the following raw materials in parts by weight: 100 parts of rubber composition, 1.5 parts of vulcanizing agent, and 5 parts of antioxidant; The reinforcing layer comprises the following raw materials in parts by weight: 100 parts of rubber composition, 20 parts of vinyl tri-tert-butylperoxysilane, 0.3 parts of crosslinking curing agent, 2 parts of vulcanizing agent, 5 parts of antioxidant, and 0.5 parts of accelerator; The adhesive rubber comprises the following raw materials in parts by weight: 25 parts of carboxyl-terminated liquid nitrile rubber and 1 part of PEEK powder.

[0041] The rubber composition comprises nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:7:4.

[0042] The preparation method of the high-temperature and corrosion-resistant diaphragm for the above-mentioned diaphragm pump includes the following steps: (1) The raw materials for the base layer are mixed at a temperature of 130℃ and a pressure of 20MP for 3 minutes to obtain the base layer; (2) The rubber composition and vinyl tritert-butyl peroxysilane in the reinforcing layer raw material are plasticized three times at 40°C; then mixed with the remaining raw material and kneaded at 135°C and 20MPa for 3 minutes to obtain the reinforcing layer; (3) After the base layer and the reinforcing layer have been left to stand for 24 hours, the adhesive rubber is applied between the base layer and the reinforcing layer, and the roller is used to compact it. Then, the hot vulcanization process is used for bonding. The steps are: vulcanize for 10 minutes at a temperature of 150℃ and a pressure of 10MPa; then bake at 180℃ for 1 hour to obtain the high temperature and corrosion resistant diaphragm for the diaphragm pump.

[0043] Example 3 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2. The only difference is that the rubber composition contains nitrile rubber, EPDM rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:8:5.

[0044] Example 4 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2. The only difference is that the rubber composition contains nitrile rubber, EPDM rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:3:2.

[0045] Example 5 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2. The only difference is that the rubber composition contains nitrile rubber, EPDM rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:10:6.

[0046] Example 6 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2, except that the reinforcing layer also contains 5 parts of tetraallyl terephthalamide.

[0047] Example 7 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2, except that the reinforcing layer also contains 10 parts of tetraallyl terephthalamide.

[0048] Example 8 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2, except that the reinforcing layer also contains 6.7 parts of tetraallyl terephthalamide.

[0049] Example 9 This embodiment provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps, whose composition and preparation method are basically the same as those in Example 7, except that the amount of tetraallyl terephthalamide in the reinforcing layer is 15 parts.

[0050] Comparative Example 1 This comparative example provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps. Its composition and preparation method are basically the same as those in Example 2, except that the rubber composition is nitrile rubber and EPDM rubber in a mass ratio of 10:7.

[0051] Comparative Example 2 This comparative example provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps, whose composition and preparation method are basically the same as those in Example 2, except that the rubber composition is nitrile rubber and methyl vinyl phenyl silicone rubber in a mass ratio of 10:4.

[0052] Comparative Example 3 This comparative example provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps, whose composition and preparation method are basically the same as those in Example 2, except that the rubber composition is EPDM rubber and methyl vinyl phenyl silicone rubber in a mass ratio of 7:4.

[0053] Comparative Example 4 This comparative example provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps, whose composition and preparation method are basically the same as those in Example 2, except that the rubber composition contains only nitrile rubber.

[0054] Comparative Example 5 This comparative example provides another high-temperature and corrosion-resistant diaphragm for diaphragm pumps, whose composition and preparation method are basically the same as those in Example 2, except that vinyltritert-butylperoxysilane is not added to the raw material of the reinforcing layer.

[0055] Test case The high-temperature and corrosion-resistant diaphragms (hereinafter referred to as diaphragms) for diaphragm pumps prepared in the above embodiments and comparative examples were subjected to the following tests: tensile properties (refer to GB / T528-2009), acid and alkali corrosion resistance (refer to GB / T1690-2010), and hot air aging performance (refer to GB / T3512-2014).

[0056] The results are shown in Tables 1 and 2 below.

[0057] Table 1

[0058] Table 2

[0059] As shown in Tables 1 and 2 above, the diaphragms prepared using the components and preparation method provided by this invention exhibit excellent tensile properties, high-temperature resistance, and acid and alkali corrosion resistance. Compared to Example 2, the diaphragms obtained in Examples 4 and 5, as well as Comparative Examples 1-4, show decreased tensile properties, significantly reduced acid and alkali corrosion resistance (especially corrosion resistance), and reduced high-temperature resistance. This demonstrates that the present invention, using a specific ratio of nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber as the main materials, helps to compensate for the poor high-temperature resistance and acid and alkali corrosion resistance of nitrile rubber, thereby obtaining a diaphragm with superior performance suitable for conveying high-temperature and corrosive liquids. It can also be seen that in Example 2, only vinyltri-tert-butylperoxysilane was added, while in Examples 7 and 8, a specific amount of tetraallyl terephthalamide was added. The mechanical properties, acid and alkali corrosion resistance, and high temperature resistance of the resulting diaphragm were improved. This may be because vinyltri-tert-butylperoxysilane and tetraallyl terephthalamide have a certain synergistic effect, which helps to improve the compatibility between the rubber composition and other raw materials and the rubber matrix, increase crosslinking, and thus improve the performance of the diaphragm.

[0060] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A high-temperature and corrosion-resistant diaphragm for a diaphragm pump, characterized in that, It includes a base layer and a reinforcing layer, with the base layer and reinforcing layer bonded together using adhesive rubber; among which, The base layer and the reinforcing layer contain a rubber composition, which comprises nitrile rubber, ethylene propylene diene monomer (EPDM) rubber and methyl vinyl phenyl silicone rubber in a mass ratio of 10:(5-8):(3-5).

2. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 1, characterized in that, The rubber composition comprises nitrile rubber, ethylene propylene diene monomer (EPDM) rubber, and methyl vinyl phenyl silicone rubber in a mass ratio of 10:7:

4.

3. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 1, characterized in that, The reinforcing layer further comprises vinyltri-tert-butylperoxysilane; the amount of vinyltri-tert-butylperoxysilane is 10-20% of the mass of the rubber composition.

4. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 3, characterized in that, The reinforcing layer also contains tetraallyl terephthalamide; the amount of tetraallyl terephthalamide is 5 to 10% of the mass of the rubber composition.

5. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 4, characterized in that, When the reinforcing layer contains both vinyltritert-butylperoxysilane and tetraallyl terephthalamide, the mass ratio of vinyltritert-butylperoxysilane to tetraallyl terephthalamide is (2-3):

1.

6. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 1, characterized in that, The base layer also contains vulcanizing agents, antioxidants, and accelerators; The reinforcing layer also includes a crosslinking curing agent, a vulcanizing agent, an antioxidant, and an accelerator.

7. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 1, characterized in that, The bonding rubber is a carboxyl-terminated liquid nitrile rubber.

8. The high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to claim 7, characterized in that, The adhesive rubber also contains PEEK powder, which is 0 to 4% of the mass of the carboxyl-terminated polybutadiene rubber.

9. A method for preparing a high-temperature and corrosion-resistant diaphragm for a diaphragm pump according to any one of claims 1-8, characterized in that, Includes the following steps: The materials of the base layer and the reinforcing layer are mixed separately to obtain the base layer and the reinforcing layer, and left to stand for 24-48 hours; then the bonding rubber and PEEK powder are mixed and coated on one side of the base layer or the reinforcing layer, and bonded by hot vulcanization process to obtain the high temperature and corrosion resistant diaphragm for the diaphragm pump.

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

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