CN112048138A - Medium-resistant pilot type electromagnetic valve diaphragm and preparation method thereof - Google Patents
Medium-resistant pilot type electromagnetic valve diaphragm and preparation method thereof Download PDFInfo
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- CN112048138A CN112048138A CN202010847398.8A CN202010847398A CN112048138A CN 112048138 A CN112048138 A CN 112048138A CN 202010847398 A CN202010847398 A CN 202010847398A CN 112048138 A CN112048138 A CN 112048138A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229920001971 elastomer Polymers 0.000 claims abstract description 81
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000000654 additive Substances 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 82
- 229910052742 iron Inorganic materials 0.000 claims description 41
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 31
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 31
- 239000004744 fabric Substances 0.000 claims description 30
- 238000004073 vulcanization Methods 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 238000009966 trimming Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 239000003795 chemical substances by application Substances 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 7
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 abstract description 4
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 abstract description 4
- 235000013539 calcium stearate Nutrition 0.000 abstract description 4
- 239000008116 calcium stearate Substances 0.000 abstract description 4
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 abstract description 4
- 229920001973 fluoroelastomer Polymers 0.000 abstract description 4
- 239000004615 ingredient Substances 0.000 abstract description 4
- 239000000306 component Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
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- B29C51/40—Venting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention relates to a medium-resistant pilot type electromagnetic valve diaphragm and a preparation method thereof, wherein the medium-resistant pilot type electromagnetic valve diaphragm comprises the following additives in percentage by weight: the rubber material comprises, by weight, 100 parts of a chemical ingredient PHR, 100 parts of fluororubber, 5-10 parts of carbon black-N99060, 1-3 parts of carbon black-N7745, 1-3 parts of calcium stearate, 3-8 parts of a bridging agent, 5-10 parts of a vulcanizing agent and 2-5 parts of erucamide. The invention can prolong the service life of the device and achieve the purpose of reducing the cost.
Description
Technical Field
The invention relates to a medium-resistant pilot-operated type electromagnetic valve diaphragm, in particular to a medium-resistant pilot-operated type electromagnetic valve diaphragm and a preparation method thereof.
Background
Chemical-resistant solenoid valves sold in the market at present are piston valves, and the piston valves have the defects of high cost, complex structure, low-pressure leakage, low-temperature leakage and the like, so that the use scene of the piston valves has certain limitations. Meanwhile, the piston type electromagnetic valve is complex in structure, high in production cost and high in maintenance cost. The diaphragm type solenoid valve does not have the problems, but the key point is that the diaphragm serving as one of the core components of the solenoid valve cannot bear chemical attack of various chemicals, the service life of the diaphragm is short, and the diaphragm needs to be replaced frequently, so that the use cost is increased.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a medium-resistant pilot-operated electromagnetic valve diaphragm and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a medium-resistant pilot-operated electromagnetic valve diaphragm comprises the following additives in percentage by weight:
preferably, the medium-resistant pilot electromagnetic valve diaphragm comprises the following components in parts by weight:
preferably, the medium-resistant pilot electromagnetic valve diaphragm comprises the following components in parts by weight:
preferably, the medium-resistant pilot electromagnetic valve diaphragm comprises the following components in parts by weight:
a preparation method of a medium-resistant pilot-operated electromagnetic valve membrane comprises the following steps:
step 1: cleaning the die cavity, filling and heating the die, and heating the filled die to a specified temperature;
step 2: setting standard requirements of molding parameters;
and step 3: cutting a single cavity, and sequentially adding rubber with different weights into a lower die cavity of a die;
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 13-15 g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 30-36 g of rubber is placed on the upper portion of the iron piece, and one piece of 30-36 g of rubber is cut in a middle plate;
step 5 a: cutting PTFE into round pieces with the diameters of 150mm and 200mm respectively, horizontally placing the round piece with the diameter of 150mm in a cavity on the upper surface of a preforming plate, horizontally placing the round piece with the diameter of 200mm in a cavity on the lower surface of the PTFE, performing for 180 seconds, controlling the temperature at 100 ℃, controlling the pressure at 0.1Mpa, exhausting once, and controlling the outer diameters of two pieces of PTFE to be 130mm after forming;
and step 5 b: performing, namely putting down the middle plate to be in contact with the lower die cavity, simultaneously pressing the upper die cavity to the middle plate, and starting by pressing an automatic button; performing for 40s, exhausting for 2s, and staying for 2s, wherein the lower half part of the diaphragm is formed in the lower die cavity, and the upper half part of the diaphragm is formed in the middle plate;
step 6: vulcanizing, namely placing cord fabric clamping cloth on the lower half part, then placing the upper half part on the cord fabric clamping cloth, placing molded and coated PTFE on the upper side and the lower side of the diaphragm, starting a machine to vulcanize according to specified conditions, wherein the exhaust length is 1.6-2 s, the time is 2-4 s, the vulcanization time is 1000-1200 s, and the vulcanization pressure is 16-20 Mpa;
and 7: demolding, and after automatic mold opening, completely wrapping the preformed structure in the step 5b by two pieces of PTFE at the moment, and then blowing out the product by using an air gun;
and 8: trimming, packaging and finally warehousing.
Preferably, in the method for manufacturing the medium-resistant pilot-operated electromagnetic valve membrane, the die filling in the step 1 is an upper die and a lower die, and the specified temperatures of the upper die and the lower die are both 150 ℃.
Preferably, the preparation method of the medium-resistant pilot-operated electromagnetic valve membrane comprises the following steps:
the material placing step 4 is to place the material, and cut two pieces of rubber in the lower die cavity, wherein 15g of rubber is added in the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 30g of rubber is placed on the upper part of the iron piece, and one piece of 30g of rubber is cut in the middle plate;
step 6: and (3) vulcanization: starting the machine to vulcanize according to the specified conditions, wherein the exhaust length is 1.6s, the time is 2s, the vulcanization time is 1000s, and the vulcanization pressure is 16 MPa.
Preferably, the preparation method of the medium-resistant pilot-operated electromagnetic valve membrane comprises the following steps:
material placing and material cutting are carried out on the lower die cavity in the step 4, wherein 15g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 36g of rubber is placed on the upper portion of the iron piece, and one piece of rubber is cut on the middle plate;
step 6: and (3) vulcanization: starting the machine to vulcanize according to the specified conditions, wherein the exhaust length is 2s, the residence time is 3s, the vulcanization time is 1100s, and the vulcanization pressure is 20 MPa.
Preferably, the preparation method of the medium-resistant pilot-operated electromagnetic valve membrane comprises the following steps:
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 14g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 35g of rubber is placed on the upper part of the iron piece, and one piece of 35g of rubber is cut in the middle plate;
step 6: and (3) vulcanization: starting the machine to vulcanize according to the specified conditions, wherein the exhaust length is 1.6s, the time is 2s, the vulcanization time is 1200s, and the vulcanization pressure is 20 MPa.
Preferably, in the method for manufacturing the medium-resistant pilot-operated electromagnetic valve membrane, the iron piece is made of perforated stainless steel, wherein the diameter of the iron piece is 50mm to 60 mm, the thickness of the iron piece is 2 mm to 3 mm, the diameter of the cord fabric is 115 mm to 130mm, and the thickness of the cord fabric is 0.2 mm to 0.3 mm.
By the scheme, the invention at least has the following advantages:
according to the invention, by adjusting the formula of the rubber material, the framework material and the structure, the diaphragm can resist steam with the pressure of 25KG at 220 ℃, so that the service life of the diaphragm can be prolonged to at least five thousand times, the use cost is effectively reduced, and the working efficiency can be improved.
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clear and clear, and to implement the technical solutions according to the content of the description, the following is a preferred embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
A medium-resistant pilot-operated electromagnetic valve diaphragm comprises the following additives in percentage by weight:
the preparation method of the medium-resistant pilot type electromagnetic valve diaphragm by combining the rubber obtained by the mixture ratio comprises the following steps:
step 1: cleaning the die cavity, filling and heating the die, and heating the filled die to a specified temperature;
step 2: setting standard requirements of molding parameters;
and step 3: cutting a single cavity, and sequentially adding rubber with different weights into a lower die cavity of a die;
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 13-15 g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 30-36 g of rubber is placed on the upper portion of the iron piece, and one piece of 30-36 g of rubber is cut in a middle plate;
step 5 a: cutting PTFE into round pieces with the diameters of 150mm and 200mm respectively, horizontally placing the round piece with the diameter of 150mm in a cavity on the upper surface of a preforming plate, horizontally placing the round piece with the diameter of 200mm in a cavity on the lower surface of the PTFE, performing for 180 seconds, controlling the temperature at 100 ℃, controlling the pressure at 0.1Mpa, exhausting once, and controlling the outer diameters of two pieces of PTFE to be 130mm after forming;
and step 5 b: performing, namely putting down the middle plate to be in contact with the lower die cavity, simultaneously pressing the upper die cavity to the middle plate, and starting by pressing an automatic button; performing for 40s, exhausting for 2s, and staying for 2s, wherein the lower half part of the diaphragm is formed in the lower die cavity, and the upper half part of the diaphragm is formed in the middle plate;
step 6: vulcanizing, namely placing cord fabric clamping cloth on the lower half part, then placing the upper half part on the cord fabric clamping cloth, placing molded and coated PTFE on the upper side and the lower side of the diaphragm, starting a machine to vulcanize according to specified conditions, wherein the exhaust length is 1.6-2 s, the time is 2-4 s, the vulcanization time is 1000-1200 s, and the vulcanization pressure is 16-20 Mpa;
and 7: demolding, and after automatic mold opening, completely wrapping the preformed structure in the step 5b by two pieces of PTFE at the moment, and then blowing out the product by using an air gun;
and 8: trimming, packaging and finally warehousing.
Example two
On the basis of the first embodiment, the rubber material comprises the following components in percentage by weight:
the rubber material comprises a chemical ingredient PHR, 100 parts of fluororubber, 100 parts of carbon black-N99060, 1.2 parts of carbon black-N7745, 1.2 parts of calcium stearate, 704 parts of bridging agent TAIC, 101-45X 5 parts of vulcanizing agent and 2 parts of erucamide;
the preparation method of the medium-resistant pilot type electromagnetic valve diaphragm by combining the rubber obtained by the mixture ratio comprises the following steps:
step 1: cleaning the die cavity, filling and heating the die, and heating the filled die to a specified temperature;
step 2: setting standard requirements of molding parameters;
and step 3: cutting a single cavity, and sequentially adding rubber with different weights into a lower die cavity of a die;
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 15g of rubber is added in the lower die cavity, then an iron piece is placed on the rubber placed for the first time, the diameter of the iron piece is 50mm, the thickness of the iron piece is 2 mm, 30g of rubber is placed on the upper portion of the iron piece, and one piece of 30g of rubber is cut on a middle plate;
step 5 a: cutting PTFE into round pieces with the diameters of 150mm and 200mm respectively, horizontally placing the round piece with the diameter of 150mm in a cavity on the upper surface of a preforming plate, horizontally placing the round piece with the diameter of 200mm in a cavity on the lower surface of the PTFE, performing for 180 seconds, controlling the temperature at 100 ℃, controlling the pressure at 0.1Mpa, exhausting once, and controlling the outer diameters of two pieces of PTFE to be 130mm after forming;
and step 5 b: performing, namely putting down the middle plate to be in contact with the lower die cavity, simultaneously pressing the upper die cavity to the middle plate, and starting by pressing an automatic button; performing for 40s, exhausting for 2s, and staying for 2s, wherein the lower half part of the diaphragm is formed in the lower die cavity, and the upper half part of the diaphragm is formed in the middle plate;
step 6: vulcanizing, placing cord fabric on the lower half part, wherein the diameter of the cord fabric is 110 mm, the thickness of the cord fabric is 0.2 mm, then placing the upper half part on the cord fabric, placing molded and rubberized PTFE on the upper side and the lower side of the membrane, then,
step 6: and (4) vulcanizing, starting a machine to vulcanize according to the specified conditions, wherein the exhaust length is 1.6s, the residence time is 2s, the vulcanization time is 1000s, and the vulcanization pressure is 16 MPa.
And 7: demolding, and after automatic mold opening, completely wrapping the preformed structure in the step 5b by two pieces of PTFE at the moment, and then blowing out the product by using an air gun;
and 8: trimming, packaging and finally warehousing.
EXAMPLE III
On the basis of the first embodiment, the rubber material comprises the following components in percentage by weight:
the rubber material comprises a chemical ingredient PHR, 100 parts of fluororubber, 100 parts of carbon black-N99062, 1.5 parts of carbon black-N7746 parts of calcium stearate, 1.5 parts of bridging agent TAIC 705, 101-45X 6 parts of vulcanizing agent and 4 parts of erucamide;
the preparation method of the medium-resistant pilot type electromagnetic valve diaphragm by combining the rubber obtained by the mixture ratio comprises the following steps:
step 1: cleaning the die cavity, filling and heating the die, and heating the filled die to a specified temperature;
step 2: setting standard requirements of molding parameters;
and step 3: cutting a single cavity, and sequentially adding rubber with different weights into a lower die cavity of a die;
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 15g of rubber is added in the lower die cavity, then an iron piece is placed on the rubber placed for the first time, the diameter of the iron piece is 55 mm, the thickness of the iron piece is 2.2 mm, 36g of rubber is placed on the upper portion of the iron piece, and one piece of rubber is cut on a middle plate;
step 5 a: cutting PTFE into round pieces with the diameters of 150mm and 200mm respectively, horizontally placing the round piece with the diameter of 150mm in a cavity on the upper surface of a preforming plate, horizontally placing the round piece with the diameter of 200mm in a cavity on the lower surface of the PTFE, performing for 180 seconds, controlling the temperature at 100 ℃, controlling the pressure at 0.1Mpa, exhausting once, and controlling the outer diameters of two pieces of PTFE to be 130mm after forming;
and step 5 b: performing, namely putting down the middle plate to be in contact with the lower die cavity, simultaneously pressing the upper die cavity to the middle plate, and starting by pressing an automatic button; performing for 40s, exhausting for 2s, and staying for 2s, wherein the lower half part of the diaphragm is formed in the lower die cavity, and the upper half part of the diaphragm is formed in the middle plate;
step 6: vulcanizing, placing cord fabric on the lower half part, wherein the diameter of the cord fabric is 115 mm, the thickness of the cord fabric is 0.23 mm, then placing the upper half part on the cord fabric, placing the molded and rubberized PTFE on the upper side and the lower side of the membrane, then,
starting the machine to vulcanize according to the specified conditions, wherein the exhaust length is 2s, the residence time is 3s, the vulcanization time is 1100s, and the vulcanization pressure is 20 MPa.
And 7: demolding, and after automatic mold opening, completely wrapping the preformed structure in the step 5b by two pieces of PTFE at the moment, and then blowing out the product by using an air gun;
and 8: trimming, packaging and finally warehousing.
Example four
On the basis of the first embodiment, the rubber material comprises the following components in percentage by weight:
the rubber material comprises a chemical ingredient PHR, 100 parts of fluororubber, 100 parts of carbon black-N99064, 7747 parts of carbon black-N, 2 parts of calcium stearate, a bridging agent TAIC 707, 101-45X 7 parts of a vulcanizing agent and 3 parts of erucamide;
the preparation method of the medium-resistant pilot type electromagnetic valve diaphragm by combining the rubber obtained by the mixture ratio comprises the following steps:
step 1: cleaning the die cavity, filling and heating the die, and heating the filled die to a specified temperature;
step 2: setting standard requirements of molding parameters;
and step 3: cutting a single cavity, and sequentially adding rubber with different weights into a lower die cavity of a die;
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 14g of rubber is added in the lower die cavity, then an iron piece is placed on the rubber placed for the first time, the diameter of the iron piece is 58 mm, the thickness of the iron piece is 2.5 mm, 35g of rubber is placed on the upper portion of the iron piece, and one piece of 35g of rubber is cut on the middle plate;
step 5 a: cutting PTFE into round pieces with the diameters of 150mm and 200mm respectively, horizontally placing the round piece with the diameter of 150mm in a cavity on the upper surface of a preforming plate, horizontally placing the round piece with the diameter of 200mm in a cavity on the lower surface of the PTFE, performing for 180 seconds, controlling the temperature at 100 ℃, controlling the pressure at 0.1Mpa, exhausting once, and controlling the outer diameters of two pieces of PTFE to be 130mm after forming;
and step 5 b: performing, namely putting down the middle plate to be in contact with the lower die cavity, simultaneously pressing the upper die cavity to the middle plate, and starting by pressing an automatic button; performing for 40s, exhausting for 2s, and staying for 2s, wherein the lower half part of the diaphragm is formed in the lower die cavity, and the upper half part of the diaphragm is formed in the middle plate;
step 6: vulcanizing, placing cord fabric on the lower half part, wherein the diameter of the cord fabric is 120 mm, the thickness of the cord fabric is 0.25 mm, then placing the upper half part on the cord fabric, placing molded and rubberized PTFE on the upper side and the lower side of the membrane, then,
starting the machine to vulcanize according to the specified conditions, wherein the exhaust length is 1.6s, the time is 2s, the vulcanization time is 1200s, and the vulcanization pressure is 20 MPa.
And 7: demolding, and after automatic mold opening, completely wrapping the preformed structure in the step 5b by two pieces of PTFE at the moment, and then blowing out the product by using an air gun;
and 8: trimming, packaging and finally warehousing.
In the first to fourth embodiments, it should be noted that:
1. after feeding, if the exhaust is not smooth, a proper amount of water can be sprayed, but the curtain cloth and the iron pieces are avoided; the bubbles can also be punctured slightly by using a copper needle at a high speed.
2. When feeding, the material center is placed at the center of the die, and the material cannot be fed eccentrically, otherwise, the phenomena of material shortage, gas elimination and the like can be caused.
3. The iron sheets, the PTFE and the cord fabric need glue coating, whether iron exposure occurs or not needs to be checked before use, the operation process is kept clean, and the adhesion effect is prevented from being influenced.
4. There is the locating hole in the middle of the iron sheet, need pay attention to the alignment of iron sheet lower part locating hole when reinforced.
TABLE 1
According to the test results mentioned in table 1, it can be easily seen that under the same conditions, the common medium-resistant piston valve has problems under some conditions, thereby causing limitation of the use scenario and higher maintenance cost. The medium-resistant piston valve has a complex structure and higher production cost than a diaphragm type electromagnetic valve, and the medium-resistant piston valve can completely meet all conditions and effectively reduce the cost.
The die set in the first to fourth examples was the upper die and the lower die, and the designated temperatures of the upper die and the lower die were both 150 ℃.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A medium-resistant pilot-operated electromagnetic valve diaphragm is characterized by comprising the following additives in percentage by weight in rubber:
2. the medium-resistant pilot-operated solenoid valve diaphragm according to claim 1, wherein the rubber material contains the following components in the following weight ratio:
3. the media-resistant pilot operated solenoid valve diaphragm of claim 1, wherein: the rubber material comprises the following components in percentage by weight:
4. the media-resistant pilot operated solenoid valve diaphragm of claim 1, wherein: the rubber material comprises the following components in percentage by weight:
5. a preparation method of a medium-resistant pilot-operated electromagnetic valve membrane is characterized by comprising the following steps:
step 1: cleaning the die cavity, filling and heating the die, and heating the filled die to a specified temperature;
step 2: setting standard requirements of molding parameters;
and step 3: cutting a single cavity, and sequentially adding rubber with different weights into a lower die cavity of a die;
and 4, step 4: placing materials, and cutting two pieces of rubber in a lower die cavity, wherein 13-15 g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 30-36 g of rubber is placed on the upper portion of the iron piece, and one piece of 30-36 g of rubber is cut in a middle plate;
step 5 a: cutting PTFE into round pieces with the diameters of 150mm and 200mm respectively, horizontally placing the round piece with the diameter of 150mm in a cavity on the upper surface of a preforming plate, horizontally placing the round piece with the diameter of 200mm in a cavity on the lower surface of the PTFE, performing for 180 seconds, controlling the temperature at 100 ℃, controlling the pressure at 0.1Mpa, exhausting once, and controlling the outer diameters of two pieces of PTFE to be 130mm after forming;
and step 5 b: performing, namely putting down the middle plate to be in contact with the lower die cavity, simultaneously pressing the upper die cavity to the middle plate, and starting by pressing an automatic button; performing for 40s, exhausting for 2s, and staying for 2s, wherein the lower half part of the diaphragm is formed in the lower die cavity, and the upper half part of the diaphragm is formed in the middle plate;
step 6: vulcanizing, namely placing cord fabric clamping cloth on the lower half part, then placing the upper half part on the cord fabric clamping cloth, placing molded and coated PTFE on the upper side and the lower side of the diaphragm, starting a machine to vulcanize according to specified conditions, wherein the exhaust length is 1.6-2 s, the time is 2-4 s, the vulcanization time is 1000-1200 s, and the vulcanization pressure is 16-20 Mpa;
and 7: demolding, and after automatic mold opening, completely wrapping the preformed structure in the step 5b by two pieces of PTFE at the moment, and then blowing out the product by using an air gun;
and 8: trimming, packaging and finally warehousing.
6. The method for preparing a dielectric-tolerant pilot-operated solenoid valve diaphragm according to claim 5, wherein the method comprises the following steps: the die filling in the step 1 comprises an upper die and a lower die, and the specified temperatures of the upper die and the lower die are both 150 ℃.
7. The method for preparing a dielectric-tolerant pilot-operated solenoid valve diaphragm according to claim 5, comprising the steps of:
placing the materials in the step 4, and cutting two pieces of rubber in the lower die cavity, wherein 15g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 30g of rubber is placed on the upper part of the iron piece, and one piece of 30g of rubber is cut on the middle plate;
and 6, vulcanizing, namely starting a machine to vulcanize according to the specified conditions, wherein the exhaust length is 1.6s, the time is 2s, the vulcanization time is 1000s, and the vulcanization pressure is 16 MPa.
8. The method for preparing a dielectric-tolerant pilot-operated solenoid valve diaphragm according to claim 5, comprising the steps of:
placing the materials in the step 4, and cutting two pieces of rubber in the lower die cavity, wherein 15g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 36g of rubber is placed on the upper part of the iron piece, and one piece of rubber is cut in the middle plate;
and 6, vulcanizing, namely starting a machine to vulcanize according to the specified conditions, wherein the exhaust length is 2s, the time is 3s, the vulcanization time is 1100s, and the vulcanization pressure is 20 MPa.
9. The method for preparing a dielectric-tolerant pilot-operated solenoid valve diaphragm according to claim 5, comprising the steps of:
placing the materials in the step 4, and cutting two pieces of rubber in the lower die cavity, wherein 14g of rubber is added into the lower die cavity, then an iron piece is placed on the rubber placed for the first time, 35g of rubber is placed on the upper part of the iron piece, and one piece of 35g of rubber is cut in the middle plate;
and 6, vulcanizing, namely starting a machine to vulcanize according to the specified conditions, wherein the exhaust length is 1.6s, the time is 2s, the vulcanization time is 1200s, and the vulcanization pressure is 20 MPa.
10. The method for manufacturing a dielectric-resistant pilot-operated solenoid valve diaphragm according to claim 5, wherein the iron member is a perforated stainless steel, wherein the diameter of the iron member is 50mm to 60 mm, the thickness of the iron member is 2 mm to 3 mm, the diameter of the cord fabric is 115 mm to 130mm, and the thickness of the cord fabric is 0.2 mm to 0.3 mm.
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