A diaphragm pump diaphragm with high bending and pressure resistance and its preparation method

Abstract

The present invention relates to the technical field of diaphragm preparation for diaphragms of ...

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm pump diaphragm preparation, in particular to a diaphragm pump diaphragm that is resistant to bending and pressure and a preparation method thereof. Background Art

[0002] A diaphragm pump is a specialized type of positive displacement pump, relying on the reciprocating movement of a diaphragm to change the volume of the working chamber, thereby drawing in and out liquid. A diaphragm pump primarily consists of two major components: a transmission unit and a diaphragm cylinder head. The transmission unit drives the diaphragm back and forth via hydraulic transmission. The pumped liquid is separated from the working fluid by the diaphragm within the pump cylinder, coming into contact only with the pump cylinder, the suction and discharge valves, and the inner side of the diaphragm, without contacting the plunger or sealing device. This allows key components like the plunger to operate entirely within the oil medium and maintain optimal working condition.

[0003] Fluorine-containing rubber refers to a synthetic polymer material containing fluorine atoms on the main chain or side chain carbon atoms. Due to the extremely high electronegativity of fluorine atoms, the C-F bond energy is large. At the same time, its atomic radius is equivalent to half of the C-C bond, and it can be tightly arranged around the carbon atoms, which plays a good volume shielding role for the main chain carbon atoms, giving fluorine rubber good chemical stability and physical and mechanical properties. It can be widely used in aerospace, aviation, military industry, national defense, automobile and other fields, especially in sealing.

[0004] The diaphragm is one of the most important core components of a diaphragm pump, requiring it to have excellent flexibility and corrosion resistance. However, the media conveyed by diaphragm pumps are often very harsh, resulting in the diaphragm's service life in actual use generally being shorter than the diaphragm's design life. Furthermore, when a hydraulic diaphragm pump is operating, the central diaphragm continuously swings back and forth, subjecting it to flex fatigue.

[0005] In the prior art, fluororubber, as a seal, has poor resistance to dynamic fatigue due to flexing, and will be damaged after about 10,000 flexing cycles. Its chemical properties are relatively stable, and it can withstand most organic and inorganic solvents and most petroleum-based oils, but it is not resistant to organic solvents such as ketones, ethers, and esters. When exposed to various media environments for a long time, fluororubber has low mechanical properties and strength. When used as a diaphragm in a diaphragm pump, it is easily damaged and has a short service life.

[0006] Therefore, the present invention provides a diaphragm pump diaphragm that is resistant to bending and pressure and a preparation method thereof to solve the above-mentioned problems. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides a diaphragm pump diaphragm that is resistant to bending and pressure and a preparation method thereof, which has the following advantages and solves the above-mentioned problems.

[0008] To achieve the above object, the present invention provides the following technical solution: a diaphragm pump diaphragm that is resistant to bending and pressure, comprising an elastic side body, a pressure-resistant intermediate body, and a wear-resistant surface body;

[0009] The elastic side body comprises the following raw materials in the following weight proportions: 60-80 parts of ternary fluororubber, 6-8 parts of crosslinking aid, 1-6 parts of dispersant, 2-8 parts of accelerator, 5-10 parts of vulcanizing agent, 40-53 parts of fiber woven mesh fabric, 6-9 parts of toughening agent, and 16-19 parts of elastomer;

[0010] The pressure-resistant intermediate comprises the following raw materials in the following weight ratios: 80-117 parts of base resin, 30-60 parts of reinforcement, and 16-48 parts of support;

[0011] The wear-resistant surface body comprises the following raw materials in the following weight proportions: 40-45 parts of base material, 10-15 parts of surface material, 6-18 parts of antioxidant, and 2-8 parts of surface modification material.

[0012] Preferably, the crosslinking aid is triallyl isocyanurate, the dispersant is a mixture of urea and glycerol, the antioxidant is one of antioxidant MB, antioxidant A, and antioxidant D, the accelerator is one or more of accelerator DM, accelerator D, accelerator M, accelerator TT, and accelerator CE, and the vulcanizing agent is sulfur.

[0013] Preferably, the elastomer is TPE elastomer particles, and the fiber woven mesh fabric is PET long fiber woven mesh fabric.

[0014] Preferably, the toughening agent is one of MBS toughening agent and AK toughening agent.

[0015] Preferably, the matrix resin is one of silicone rubber, PERT or HDPE resin powder, and the reinforcement is one of potassium hexatitanate whiskers and aluminum borate whiskers or a mixture of the two.

[0016] Preferably, the support is a carbon nanotube, and the carbon nanotube is at least one of a zigzag nanotube, an armchair nanotube, and a helical nanotube.

[0017] Preferably, the surface modification material is modified nano-TiO2;

[0018] The surface-modified nano-TiO2 is surface-modified nano-TiO2 prepared by a sol-gel method. 10 ml of butyl titanate is slowly dripped into 35 ml of anhydrous ethanol at room temperature, stirred for 10 minutes, and then allowed to stand to form a yellow clear solution. 2 ml of glacial acetic acid and 10 ml of anhydrous ethanol are then mixed and vigorously stirred to obtain a transparent solution. Hydrochloric acid is then dripped into the transparent solution to adjust the pH value to 3. In a room temperature water bath, the yellow clear solution is dripped into the transparent solution under vigorous stirring to obtain a light yellow solution. The solution is then stirred and heated in a water bath at 40°C for 1 hour to obtain a white gel. The gel is then dried at 80°C and heat-treated at 600°C for 2 hours to obtain white nano-TiO2 powder. Finally, the obtained white nano-TiO2 powder is blended and stirred with sodium dodecyl sulfate for 40 minutes, and dried to obtain surface-modified nano-TiO2.

[0019] Another technical problem to be solved by the present invention is to provide a method for preparing a diaphragm pump diaphragm that is resistant to bending and pressure, comprising the following steps:

[0020] Step 1: Prepare the elastic side body:

[0021] Prepare appropriate weight proportions of ternary fluororubber, crosslinking aid, dispersant, accelerator, vulcanizing agent, fiber woven mesh fabric, toughening agent, and elastomer;

[0022] Step 2: After mixing the ternary fluororubber with the elastomer, toughening agent and dispersant, the mixture is put into an open mill, and a vulcanizing agent is added, and the mixture is thinly milled in the open mill;

[0023] Step 3: The rubber compound after the open mill is then placed in a three-roll calendering device for calendering to obtain a film sheet, wherein the distance between the second roller and the third roller is smaller than the distance between the first roller and the second roller, and the film is cut using a slitting machine;

[0024] Step 4: The fiber woven mesh fabric is then stored, unwound, flattened, and rolled together with the diaphragm, and cross-linking aids and accelerators are evenly added. After compounding, it is introduced into the drying tunnel assembly line, where it is heated to vulcanize and foam the diaphragm. When the diaphragm is completely in a peristaltic state, the fiber woven mesh fabric and the diaphragm layer are hot-pressed and flattened, and then punched;

[0025] Step 5: Preparation of pressure-resistant intermediate:

[0026] Prepare appropriate weight proportions of matrix resin, reinforcement and support;

[0027] Step 6: fully mix the matrix resin, reinforcement and support, then put them into the open mill for refining, and then take them out and cut them into slices using a cutting machine;

[0028] Step 7: Preparation of wear-resistant surface:

[0029] Prepare appropriate weight proportions of base material, fabric, antioxidant and surface modifier;

[0030] Step 8: fully mix the base material, fabric, antioxidant and surface modification material, then put them into the open mill for refining, and then take them out and cut them into pieces using a cutting machine;

[0031] Step nine: overlap the prepared pressure-resistant intermediate body, elastic side body and wear-resistant surface body in order from the inside out, introduce them into the drying tunnel assembly line after compounding, perform hot pressing compounding, flatten them, and then punch them.

[0032] Compared with the prior art, the present invention provides a diaphragm pump diaphragm that is resistant to bending and pressure and a preparation method thereof, which has the following beneficial effects:

[0033] 1. The preparation method of the diaphragm pump diaphragm with good bending and pressure resistance makes the diaphragm pump diaphragm have excellent bending and fatigue resistance, resistance to various media, and can maintain high tear strength and elongation at break, good reciprocating bending and fatigue resistance and compression permanent deformation performance in media environments such as esters and ketones. It has excellent anti-corrosion effect when used in diaphragm pumps, is not easy to be damaged, and has a long service life.

[0034] 2. The diaphragm of the diaphragm pump that is resistant to bending and pressure and the preparation method thereof are achieved by overlapping a pressure-resistant intermediate body, an elastic side body and a wear-resistant surface body in order from the inside to the outside, and a fiber woven mesh fabric is wrapped inside the diaphragm body. The fiber woven mesh fabric is reinforced, and its pressure resistance and flexion resistance are greatly improved. The combination of the elastic side body and the wear-resistant surface body will further improve the flexion resistance of the diaphragm pump diaphragm, effectively extend the service life of the diaphragm pump diaphragm, and reduce the cost of repair and maintenance of the diaphragm pump. DETAILED DESCRIPTION

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0036] A diaphragm pump diaphragm that is resistant to bending and pressure, comprising an elastic side body, a pressure-resistant intermediate body, and a wear-resistant surface body;

[0037] The elastic side body includes the following raw materials in the following weight proportions: 80 parts of ternary fluororubber, 8 parts of crosslinking agent, 6 parts of dispersant, 8 parts of accelerator, 10 parts of vulcanizing agent, 53 parts of fiber woven mesh fabric, 9 parts of toughening agent, and 19 parts of elastomer;

[0038] The pressure-resistant intermediate comprises the following raw materials in the following weight proportions: 117 parts of base resin, 60 parts of reinforcement, and 48 parts of support;

[0039] The wear-resistant surface body comprises the following raw materials in the following weight proportions: 45 parts of base material, 15 parts of outer material, 18 parts of antioxidant and 8 parts of surface modification material.

[0040] The cross-linking auxiliary agent is triallyl isocyanurate, the dispersant is a mixture of urea and glycerol, the antioxidant is antioxidant D, the accelerator is accelerator DM, and the vulcanizing agent is sulfur.

[0041] The elastomer is TPE elastomer particles, and the fiber woven mesh fabric is PET long fiber woven mesh fabric.

[0042] The toughening agent is MBS toughening agent.

[0043] The matrix resin is silicone rubber, and the reinforcement is potassium hexatitanate whiskers and aluminum borate whiskers.

[0044] The support is a carbon nanotube, which is a spiral nanotube.

[0045] The surface modification material is modified nano-TiO2;

[0046] The surface-modified nano-TiO2 is surface-modified nano-TiO2 prepared by the sol-gel method. 10 ml of butyl titanate is slowly dripped into 35 ml of anhydrous ethanol at room temperature, stirred for 10 minutes, and then allowed to stand to form a yellow clear solution. Then 2 ml of glacial acetic acid and 10 ml of anhydrous ethanol are mixed, and vigorously stirred to obtain a transparent solution. Then hydrochloric acid is dripped into the transparent solution to adjust the pH value to 3. In a room temperature water bath, the yellow clear solution is dripped into the transparent solution under vigorous stirring to obtain a light yellow solution. Then, the solution is stirred and heated in a water bath at 40°C for 1 hour to obtain a white gel. Then, the gel is dried at 80°C and heat-treated at 600°C for 2 hours to obtain white nano-TiO2 powder. Finally, the obtained white nano-TiO2 powder is blended and stirred with sodium dodecyl sulfate for 40 minutes, and surface-modified nano-TiO2 is obtained after drying.

[0047] Another technical problem to be solved by the present invention is to provide a method for preparing a diaphragm pump diaphragm that is resistant to bending and pressure, comprising the following steps:

[0048] Step 1: Prepare the elastic side body:

[0049] Prepare appropriate weight proportions of ternary fluororubber, crosslinking aid, dispersant, accelerator, vulcanizing agent, fiber woven mesh fabric, toughening agent, and elastomer;

[0050] Step 2: After mixing the ternary fluororubber with the elastomer, toughening agent and dispersant, the mixture is put into an open mill, and a vulcanizing agent is added, and the mixture is thinly milled in the open mill;

[0051] Step 3: The rubber compound after the open mill is then placed in a three-roll calendering device for calendering to obtain a film sheet, wherein the distance between the second roller and the third roller is smaller than the distance between the first roller and the second roller, and the film is cut using a slitting machine;

[0052] Step 4: The fiber woven mesh fabric is then stored, unwound, flattened, and rolled together with the diaphragm, and cross-linking aids and accelerators are evenly added. After compounding, it is introduced into the drying tunnel assembly line, where it is heated to vulcanize and foam the diaphragm. When the diaphragm is completely in a peristaltic state, the fiber woven mesh fabric and the diaphragm layer are hot-pressed and flattened, and then punched;

[0053] Step 5: Preparation of pressure-resistant intermediate:

[0054] Prepare appropriate weight proportions of matrix resin, reinforcement and support;

[0055] Step 6: fully mix the matrix resin, reinforcement and support, then put them into the open mill for refining, and then take them out and cut them into slices using a cutting machine;

[0056] Step 7: Preparation of wear-resistant surface:

[0057] Prepare appropriate weight proportions of base material, fabric, antioxidant and surface modifier;

[0058] Step 8: fully mix the base material, fabric, antioxidant and surface modification material, then put them into the open mill for refining, and then take them out and cut them into pieces using a cutting machine;

[0059] Step nine: overlap the prepared pressure-resistant intermediate body, elastic side body and wear-resistant surface body in order from the inside out, introduce them into the drying tunnel assembly line after compounding, perform hot pressing compounding, flatten them, and then punch them. Example

[0060] A diaphragm pump diaphragm that is resistant to bending and pressure, comprising an elastic side body, a pressure-resistant intermediate body, and a wear-resistant surface body;

[0061] The elastic side body includes the following raw materials in the following weight proportions: 60 parts of ternary fluororubber, 6 parts of crosslinking agent, 1 part of dispersant, 2 parts of accelerator, 5 parts of vulcanizing agent, 40 parts of fiber woven mesh fabric, 6 parts of toughening agent, and 16 parts of elastomer;

[0062] The pressure-resistant intermediate comprises the following raw materials in the following weight proportions: 80 parts of base resin, 30 parts of reinforcement, and 16 parts of support;

[0063] The wear-resistant surface body comprises the following raw materials in the following weight proportions: 40 parts of base material, 10 parts of surface material, 6 parts of antioxidant and 2 parts of surface modification material.

[0064] The cross-linking auxiliary agent is triallyl isocyanurate, the dispersant is a mixture of urea and glycerol, the antioxidant is antioxidant MB, the accelerator is accelerator DM, and the vulcanizing agent is sulfur.

[0065] The elastomer is TPE elastomer particles, and the fiber woven mesh fabric is PET long fiber woven mesh fabric.

[0066] The toughening agent is MBS toughening agent.

[0067] The matrix resin is silicone rubber and the reinforcement is potassium hexatitanate whiskers.

[0068] The support is a carbon nanotube, and the carbon nanotube is a zigzag nanotube.

[0069] The surface modification material is modified nano-TiO2;

[0070] The surface-modified nano-TiO2 is surface-modified nano-TiO2 prepared by the sol-gel method. 10 ml of butyl titanate is slowly dripped into 35 ml of anhydrous ethanol at room temperature, stirred for 10 minutes, and then allowed to stand to form a yellow clear solution. Then 2 ml of glacial acetic acid and 10 ml of anhydrous ethanol are mixed, and vigorously stirred to obtain a transparent solution. Then hydrochloric acid is dripped into the transparent solution to adjust the pH value to 3. In a room temperature water bath, the yellow clear solution is dripped into the transparent solution under vigorous stirring to obtain a light yellow solution. Then, the solution is stirred and heated in a water bath at 40°C for 1 hour to obtain a white gel. Then, the gel is dried at 80°C and heat-treated at 600°C for 2 hours to obtain white nano-TiO2 powder. Finally, the obtained white nano-TiO2 powder is blended and stirred with sodium dodecyl sulfate for 40 minutes, and surface-modified nano-TiO2 is obtained after drying.

[0071] Another technical problem to be solved by the present invention is to provide a method for preparing a diaphragm pump diaphragm that is resistant to bending and pressure, comprising the following steps:

[0072] Step 1: Prepare the elastic side body:

[0073] Prepare appropriate weight proportions of ternary fluororubber, crosslinking aid, dispersant, accelerator, vulcanizing agent, fiber woven mesh fabric, toughening agent, and elastomer;

[0074] Step 2: After mixing the ternary fluororubber with the elastomer, toughening agent and dispersant, the mixture is put into an open mill, and a vulcanizing agent is added, and the mixture is thinly milled in the open mill;

[0075] Step 3: The rubber compound after the open mill is then placed in a three-roll calendering device for calendering to obtain a film sheet, wherein the distance between the second roller and the third roller is smaller than the distance between the first roller and the second roller, and the film is cut using a slitting machine;

[0076] Step 4: The fiber woven mesh fabric is then stored, unwound, flattened, and rolled together with the diaphragm, and cross-linking aids and accelerators are evenly added. After compounding, it is introduced into the drying tunnel assembly line, where it is heated to vulcanize and foam the diaphragm. When the diaphragm is completely in a peristaltic state, the fiber woven mesh fabric and the diaphragm layer are hot-pressed and flattened, and then punched;

[0077] Step 5: Preparation of pressure-resistant intermediate:

[0078] Prepare appropriate weight proportions of matrix resin, reinforcement and support;

[0079] Step 6: fully mix the matrix resin, reinforcement and support, then put them into the open mill for refining, and then take them out and cut them into slices using a cutting machine;

[0080] Step 7: Preparation of wear-resistant surface:

[0081] Prepare appropriate weight proportions of base material, fabric, antioxidant and surface modifier;

[0082] Step 8: fully mix the base material, fabric, antioxidant and surface modification material, then put them into the open mill for refining, and then take them out and cut them into pieces using a cutting machine;

[0083] Step nine: overlap the prepared pressure-resistant intermediate body, elastic side body and wear-resistant surface body in order from the inside out, introduce them into the drying tunnel assembly line after compounding, perform hot pressing compounding, flatten them, and then punch them.

[0084] The beneficial effects of the present invention are: the preparation method of the diaphragm pump diaphragm that is resistant to bending and pressure makes the diaphragm pump diaphragm have excellent flexural fatigue resistance and resistance to multiple media. It can maintain high tear strength and tear elongation, good reciprocating flexural fatigue resistance and compression permanent deformation performance in media environments such as esters and ketones. It has excellent anti-corrosion effect when used in diaphragm pumps, is not easy to be damaged, and has a long service life. The pressure-resistant intermediate body, the elastic side body and the wear-resistant surface body are overlapped in order from the inside to the outside, and the fiber woven mesh fabric is wrapped in the membrane body. The fiber woven mesh fabric is reinforced, and its pressure resistance and flexural resistance are greatly improved. The combination of the elastic side body and the wear-resistant surface body will further improve the flexural resistance of the diaphragm pump, effectively extend the service life of the diaphragm pump, and reduce the cost of repair and maintenance of the diaphragm pump.

[0085] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A diaphragm pump diaphragm that is resistant to bending and pressure, characterized in that: It includes an elastic side body, a pressure-resistant intermediate body and a wear-resistant surface body; The elastic side body comprises the following raw materials in the following weight proportions: 60-80 parts of ternary fluororubber, 6-8 parts of crosslinking aid, 1-6 parts of dispersant, 2-8 parts of accelerator, 5-10 parts of vulcanizing agent, 40-53 parts of fiber woven mesh fabric, 6-9 parts of toughening agent, and 16-19 parts of elastomer; The pressure-resistant intermediate comprises the following raw materials in the following weight ratios: 80-117 parts of base resin, 30-60 parts of reinforcement, and 16-48 parts of support; The wear-resistant surface body comprises the following raw materials in the following weight ratios: 40-45 parts of base material, 10-15 parts of fabric, 6-18 parts of antioxidant, and 2-8 parts of surface-modified nano-TiO2; The matrix resin is one of silicone rubber, PERT or HDPE resin powder, the reinforcement is one of potassium hexatitanate whiskers and aluminum borate whiskers or a mixture of the two; the support is carbon nanotubes, and the carbon nanotubes are at least one of zigzag nanotubes, armchair nanotubes and spiral nanotubes.

2. A diaphragm pump diaphragm that is resistant to bending and pressure according to claim 1, characterized in that: The cross-linking auxiliary agent is triallyl isocyanurate, the dispersant is a mixture of urea and glycerol, the antioxidant is one of antioxidant MB, antioxidant A, and antioxidant D, the accelerator is one or more of accelerator DM, accelerator D, accelerator M, accelerator TT, and accelerator CE, and the vulcanizing agent is sulfur.

3. The diaphragm pump diaphragm with bending resistance and pressure resistance according to claim 1, characterized in that: The elastomer is TPE elastomer particles, and the fiber woven mesh fabric is PET long fiber woven mesh fabric.

4. The diaphragm pump diaphragm with bending resistance and pressure resistance according to claim 1, characterized in that: The toughening agent is one of an MBS toughening agent and an AK toughening agent.

5. The diaphragm pump diaphragm with bending resistance and pressure resistance according to claim 1, characterized in that: The surface-modified nano-TiO2 is surface-modified nano-TiO2 prepared by a sol-gel method. 10 ml of butyl titanate is slowly dripped into 35 ml of anhydrous ethanol at room temperature, stirred for 10 minutes, and then allowed to stand to form a yellow clear solution. 2 ml of glacial acetic acid and 10 ml of anhydrous ethanol are then mixed and vigorously stirred to obtain a transparent solution. Hydrochloric acid is then dripped into the transparent solution to adjust the pH value to 3. In a room temperature water bath, the yellow clear solution is dripped into the transparent solution under vigorous stirring to obtain a light yellow solution. The solution is then heated in a water bath at 40°C with stirring for 1 hour to obtain a white gel. The gel is then dried at 80°C and heat-treated at 600°C for 2 hours to obtain white nano-TiO2 powder. Finally, the obtained white nano-TiO2 powder is blended and stirred with sodium dodecyl sulfate for 40 minutes, and dried to obtain surface-modified nano-TiO2.

6. The method for preparing a bending-resistant and pressure-resistant diaphragm pump diaphragm according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Prepare the elastic side body: Prepare appropriate weight proportions of ternary fluororubber, crosslinking aid, dispersant, accelerator, vulcanizing agent, fiber woven mesh fabric, toughening agent, and elastomer; Step 2: After mixing the ternary fluororubber with the elastomer, toughening agent and dispersant, the mixture is put into an open mill, and a vulcanizing agent is added, and the mixture is thinly milled in the open mill; Step 3: The rubber compound after the open mill is then placed in a three-roll calendering device for calendering to obtain a film sheet, wherein the distance between the second roller and the third roller is smaller than the distance between the first roller and the second roller, and the film is cut using a slitting machine; Step 4: The fiber woven mesh fabric is then stored, unwound, flattened, and rolled together with the diaphragm, and cross-linking aids and accelerators are evenly added. After compounding, it is introduced into the drying tunnel assembly line, where it is heated to vulcanize and foam the diaphragm. When the diaphragm is completely in a peristaltic state, the fiber woven mesh fabric and the diaphragm layer are hot-pressed and flattened, and then punched; Step 5: Preparation of pressure-resistant intermediate: Prepare appropriate weight proportions of matrix resin, reinforcement and support; Step 6: Fully mix the matrix resin, reinforcement and support, then put them into the open mill for refining, and then take them out and cut them into slices using a cutting machine; Step 7: Preparation of wear-resistant surface: Prepare appropriate weight proportions of base material, fabric, antioxidant and surface modifier; Step 8: Fully mix the base material, fabric, antioxidant and surface modification material, then put them into the open mill for refining, and then take them out and cut them into slices using a cutting machine; Step nine: overlap the prepared elastic side body, pressure-resistant intermediate body and wear-resistant surface body in order from the inside out, introduce them into the drying tunnel assembly line after compounding, perform hot pressing compounding, flatten them, and then punch them.