CN111234427B - Manufacturing method of enhanced polytetrafluoroethylene for high-medium pressure valve sealing element - Google Patents
Manufacturing method of enhanced polytetrafluoroethylene for high-medium pressure valve sealing element Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions 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; Compositions of derivatives of such polymers
- C08L27/02—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions 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; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/006—Pressing and sintering powders, granules or fibres
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J1/00—Adhesives based on inorganic constituents
- C09J1/02—Adhesives based on inorganic constituents containing water-soluble alkali silicates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on 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 an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/085—Copper
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Abstract
The invention relates to a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element, which comprises the following steps: mixing the raw materials; forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 18-20MPa to obtain a rough inner blank; primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature; forming an outer blank: coating an adhesive on the surface of the fired inner blank, then putting the rough inner blank into a large mold, putting the outer material into the large mold, and forming under the pressure of 34-39MPa to obtain a rough final blank; final firing: placing the rough finished blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature to obtain a product to be detected; and (6) detecting. The sealing element prepared by the invention has good rigidity in the interior and certain flexibility of the sealing surface, so that the sealing element has good strength, the service life of the sealing element is prolonged, and meanwhile, the sealing element can have good sealing effect.
Description
Technical Field
The invention relates to the technical field of sealing elements, in particular to a manufacturing method of enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element.
Background
The sealing member is a material or a part for preventing fluid or solid particles from leaking from an adjacent joint surface and preventing external impurities such as dust, moisture and the like from invading internal parts of the machine equipment; classified according to the function, the sealing device can be divided into a shaft sealing device, a hole sealing device, a dustproof sealing device, a guide ring, a fixed sealing device and a rotary sealing device; according to material classification, the rubber can be divided into butyl cyanide rubber, ethylene propylene diene monomer rubber, fluororubber, silica gel, fluorosilicone rubber, nylon, polyurethane, engineering plastics and the like.
The prior application publication No. CN103467896A discloses a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element, and the process route is as follows: material preparation → drying → material mixing → mold filling and compaction molding → sintering → mechanical processing → inspection and warehousing, wherein the mass part ratio of various components is as follows: 0.5 to 1.5 portions of high-strength carbon nanofibers; 3-5 parts of molybdenum disulfide powder; 20-25 parts of tin bronze powder; 65-75 parts of polytetrafluoroethylene powder; optionally adding reinforcing glass fiber with length of 3-5mm, 5-10; 10-15 parts of silicon dioxide powder; graphite powder, 1-2, white corundum powder, 1-3, green silicon carbide powder, 1-3, one or more of the above, dispersing agent 5040: the weight is 1 percent of the total weight of all raw materials.
However, in addition to the sealing member required to have appropriate mechanical strength and hardness, the sealing surface thereof is required to have good flexibility, elasticity, and compactness so as not to easily leak the medium; although the above patent provides the sealing member with good strength as a whole, the raw materials of the above patent are formed by mixing at one time, which causes the internal rigidity of the sealing member and the flexibility of the sealing surface to affect each other, and reduces the service life and the sealing effect of the sealing member.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the manufacturing method of the enhanced polytetrafluoroethylene for the high-medium pressure valve sealing element, the prepared sealing element has good rigidity inside, and the sealing surface has certain flexibility, so that the sealing element has good strength, the service life of the sealing element is prolonged, and meanwhile, the sealing element can play a good sealing effect.
The above object of the present invention is achieved by the following technical solutions:
a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element,
the raw materials comprise the following components in parts by weight:
inner blank: 78-97 parts of polytetrafluoroethylene, 41-65 parts of beryllium copper, 29-45 parts of carbon fiber, 9-15 parts of molybdenum dioxide and 11-22 parts of binder;
outer blank: 42-69 parts of polytetrafluoroethylene, 13-20 parts of polyether-ether-ketone, 1-6 parts of beryllium copper, 23-39 parts of para-polyphenyl, 3-7 parts of a compatilizer and 2-8 parts of an antistatic agent;
the preparation method comprises the following steps:
mixing raw materials:
mixing inner blanks: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 160 parts by weight of 120-fold solvent, and stirring at a rotating speed of 280r/min for 0.8-1 h; heating to 90-100 ℃, and extracting the solvent under vacuum to obtain an inner material;
mixing outer blanks: adding polytetrafluoroethylene, polyether ether ketone, beryllium copper, polyparaphenylene, a compatilizer and an antistatic agent into 80-100 parts by weight of a solvent, and then stirring at a rotating speed of 200-230r/min for 0.5-0.7 h; heating to 90-100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 18-20MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size mold, wrapping the rough inner blank with the outer material, compacting and molding at a molding pressure of 34-39MPa to obtain a rough final blank;
final firing: placing the rough finished blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature to obtain a product to be detected;
and (3) detection: and (4) inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product.
By adopting the technical scheme, the inner blank and the outer blank are independently prepared, the inner blank is prepared by taking polytetrafluoroethylene as a base material and adding beryllium copper, carbon fiber and molybdenum dioxide as fillers, and the beryllium copper, the carbon fiber and the molybdenum dioxide have high hardness and wear resistance, so that the inside of the sealing element has excellent mechanical properties to improve the integral stress strength of the sealing element; meanwhile, the adhesive is added, so that the bonding strength of the inner blank can be further improved, and the integral strength of the sealing element is improved;
for the outer blank, polytetrafluoroethylene is used as a base material, a small amount of beryllium copper is added to ensure the strength of the sealing part of the sealing element, meanwhile, polyether-ether-ketone with rigidity and flexibility is added to improve the elasticity of the sealing part of the sealing element and improve the fatigue resistance of the sealing element under alternating stress, and the added polyparaphenylene can further improve the strength of the sealing part of the sealing element due to the great rigidity and regularity of molecular chains of the polyparaphenylene; the compatilizer and the antistatic agent are used as functional additives, so that the bonding strength of a sealing part can be improved, the antistatic performance of a sealing element can be improved, and the electrostatic hazard is reduced;
in the invention, when the raw materials are mixed, the raw materials are put into a solvent for mixing, and corresponding inner materials and outer materials are obtained after suction filtration, so that the components of the inner materials and the outer materials are uniformly mixed, and the comprehensive performance of the sealing element is improved; and after the inner blank is initially fired, the outer surface of the rough inner blank is coated with the adhesive, and then the outer material is added, so that the bonding strength of the inner blank and the outer blank can be effectively improved, and the influence on the use of the sealing element caused by the separation of the inner blank and the outer blank is avoided.
The invention is further provided that the molecular weight of the polytetrafluoroethylene in the inner blank is 800-1000 ten thousand, and the molecular weight of the polytetrafluoroethylene in the outer blank is 1-3 ten thousand.
By adopting the technical scheme, the inner blank adopts the polytetrafluoroethylene with high molecular weight, the strength of the inner blank can be effectively improved, the outer blank adopts the polytetrafluoroethylene with low molecular weight, the flexibility of a sealing part can be improved, and the sealing effect of the sealing element is improved.
The invention is further configured that the adhesive comprises the following components in parts by weight: 34-56 parts of kp1 daub, 23-37 parts of polyvinyl formal and 21-34 parts of epoxy resin.
By adopting the technical scheme, the kp1 daub is prepared from potassium water glass, condensed aluminum phosphate, acid-resistant powder and a small amount of additives, has good bonding performance, has excellent heat resistance and high mechanical strength, and can further improve the service performance of a sealing element; polyvinyl formal is a high molecular compound formed by the action of polyvinyl alcohol and formaldehyde, has excellent viscosity to improve the bonding strength of an inner blank, has excellent wear resistance, and can prolong the service life of a sealing element; the epoxy resin is a thermosetting resin, has good bonding strength, and epoxy groups in the epoxy resin can generate crosslinking reaction with hydroxyl groups in polyvinyl formal, so that the epoxy resin is cured, and the strength of the sealing element is further improved.
The invention is further provided that the compatilizer comprises the following components in parts by weight: 23-45 parts of maleic anhydride grafted ethylene and 16-24 parts of vinyl trimethoxy silane.
By adopting the technical scheme, the anhydride group in the maleic anhydride grafted ethylene can perform generalized dehydration reaction with a polar group under the action of high temperature and form a chemical bond, so that incompatible polar and nonpolar substances are chemically coupled, and the maleic anhydride grafted ethylene and polytetrafluoroethylene both contain vinyl groups which are similar and soluble, so that the compatibility of each component in the outer blank can be further improved; the vinyltrimethoxysilane is a silane coupling agent, the siloxy group has reactivity to inorganic matters, and the organic functional group has reactivity or compatibility to organic matters, so when the vinyltrimethoxysilane is between an inorganic interface and an organic interface, a bonding layer of an organic matrix, the silane coupling agent and an inorganic matrix can be formed, the compatibility among all components can be effectively improved, and after the vinyltrimethoxysilane is acted, a formed cross-linked product has good mechanical strength, and the service performance of a sealing element can be further improved.
The invention is further configured that the solvent is one of dimethyl carbonate, ethylene carbonate and propylene carbonate.
By adopting the technical scheme, the dimethyl carbonate, the ethylene carbonate and the propylene carbonate are used as the carbonic ester and can be used as the polar solvent, so that the components in the raw materials of the sealing element can be well dispersed, the mixing uniformity of the components can be improved, and the service performance of the sealing element can be improved.
The invention is further configured that the antistatic agent comprises the following components in parts by weight: 17-25 parts of glycerol stearate and 13-22 parts of silicone oil.
By adopting the technical scheme, the glyceryl stearate is used as a material with good heat resistance and has good lubricating property, so that the friction among the components can be reduced, the static electricity generated by the overflow of electrons is avoided, and meanwhile, the glyceryl stearate has good dispersing, wetting, penetrating and diffusing properties, so that the mixing uniformity of the components of the sealing element can be further improved; the silicone oil is used as a surfactant, can form a film, so that components are lubricated, namely, the friction coefficient between the components is reduced, in addition, as the surface of the silicone oil becomes a conductor which is easy to conduct electricity, the charges generated by friction are dispersed, electricity is not concentrated, an antistatic effect can be achieved, meanwhile, the heat resistance and the compression resistance of the silicone oil are excellent, and the service life of a sealing element can be prolonged.
The invention is further configured that the adhesive comprises the following components in parts by weight: 16-23 parts of polydimethylsiloxane and 23-36 parts of phenolic resin.
By adopting the technical scheme, the polydimethylsiloxane is used as an organic silicon material, has good viscosity, has excellent thermal conductivity, can strengthen the heat transfer between the inner blank and the outer blank, and improves the firing effect; the phenolic resin has excellent mechanical property and heat resistance besides good viscosity, and can improve the strength of the joint surface of the inner blank and the outer blank.
The invention is further provided with: a manufacturing method of enhanced polytetrafluoroethylene for a high and medium pressure valve sealing element comprises the following raw materials in parts by weight:
inner blank: 86 parts of polytetrafluoroethylene, 57 parts of beryllium copper, 33 parts of carbon fiber, 12 parts of molybdenum dioxide and 14 parts of binder;
outer blank: 60 parts of polytetrafluoroethylene, 17 parts of polyether-ether-ketone, 3 parts of beryllium copper, 32 parts of polyparaphenylene, 6 parts of a compatilizer and 5 parts of an antistatic agent;
the preparation method comprises the following steps:
mixing raw materials:
mixing inner blanks: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 150 parts by weight of dimethyl carbonate, and stirring for 1h at the rotating speed of 280 r/min; heating to 90 ℃, and extracting the solvent under vacuum to obtain an inner material;
mixing outer blanks: adding polytetrafluoroethylene, polyether-ether-ketone, beryllium copper, polyparaphenylene, a compatilizer and an antistatic agent into 100 parts by weight of dimethyl carbonate, and then stirring at the rotating speed of 230r/min for 0.6 h; heating to 100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 20MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size die to enable the outer material to wrap the rough inner blank, and then compacting and forming under the forming pressure of 37MPa to obtain a rough final blank;
final firing: placing the rough finished blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature to obtain a product to be detected;
and (3) detection: inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product;
wherein:
the adhesive comprises the following components in parts by weight: 45 parts of kp1 daub, 30 parts of polyvinyl formal and 29 parts of epoxy resin;
the compatilizer comprises the following components in parts by weight: 38 parts of maleic anhydride grafted ethylene and 21 parts of vinyl trimethoxy silane;
the antistatic agent comprises the following components in parts by weight: 22 parts of glycerol stearate and 18 parts of silicone oil;
the adhesive comprises the following components in parts by weight: 18 parts of polydimethylsiloxane and 30 parts of phenolic resin.
By adopting the technical scheme, the preparation raw materials and the preparation conditions of the polytetrafluoroethylene sealing element are further refined, and the service performance of the polytetrafluoroethylene sealing element can be further improved.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the inner blank and the outer blank are independently prepared, so that the interior of the sealing element prepared by the method has good rigidity, and the sealing surface has certain flexibility, so that the sealing element has good strength, the service life of the sealing element is prolonged, and the sealing element can have good sealing effect;
2. when the raw materials are mixed, the raw materials are put into a solvent for mixing, and corresponding inner materials and outer materials are obtained after suction filtration, so that the components of the inner materials and the outer materials are uniformly mixed, and the comprehensive performance of a sealing element is improved; and after the inner blank is initially fired, after the adhesive is coated on the outer surface of the rough inner blank, the outer material is added, so that the bonding strength of the inner blank and the outer blank can be effectively improved, and the influence on the use of a sealing element caused by the separation of the inner blank and the outer blank is avoided.
Detailed Description
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
the invention discloses a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element,
the raw materials comprise the following components in parts by weight:
inner blank: 78 parts of polytetrafluoroethylene, 41 parts of beryllium copper, 31 parts of carbon fiber, 9 parts of molybdenum dioxide and 14 parts of binder;
outer blank: 45 parts of polytetrafluoroethylene, 15 parts of polyether-ether-ketone, 2 parts of beryllium copper, 23 parts of polyparaphenylene, 3 parts of a compatilizer and 2 parts of an antistatic agent.
Wherein:
the adhesive comprises the following components in parts by weight: 34 parts of kp1 daub, 23 parts of polyvinyl formal and 25 parts of epoxy resin.
The compatilizer comprises the following components in parts by weight: 23 parts of maleic anhydride grafted ethylene and 18 parts of vinyl trimethoxy silane.
The antistatic agent comprises the following components in parts by weight: 17 parts of glycerol stearate and 15 parts of silicone oil.
Example two:
the invention discloses a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element,
the raw materials comprise the following components in parts by weight:
inner blank: 83 parts of polytetrafluoroethylene, 47 parts of beryllium copper, 29 parts of carbon fiber, 12 parts of molybdenum dioxide and 11 parts of binder;
outer blank: 42 parts of polytetrafluoroethylene, 13 parts of polyether-ether-ketone, 1 part of beryllium copper, 25 parts of polyparaphenylene, 4 parts of a compatilizer and 4 parts of an antistatic agent.
Wherein:
the adhesive comprises the following components in parts by weight: 40 parts of kp1 daub, 25 parts of polyvinyl formal and 21 parts of epoxy resin.
The compatilizer comprises the following components in parts by weight: 25 parts of maleic anhydride grafted ethylene and 16 parts of vinyl trimethoxy silane.
The antistatic agent comprises the following components in parts by weight: 18 parts of glycerol stearate and 13 parts of silicone oil.
Example three:
a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element,
the raw materials comprise the following components in parts by weight:
inner blank: 86 parts of polytetrafluoroethylene, 57 parts of beryllium copper, 33 parts of carbon fiber, 12 parts of molybdenum dioxide and 14 parts of binder;
outer blank: 60 parts of polytetrafluoroethylene, 17 parts of polyether-ether-ketone, 3 parts of beryllium copper, 32 parts of polyparaphenylene, 6 parts of a compatilizer and 5 parts of an antistatic agent.
Wherein:
the adhesive comprises the following components in parts by weight: 45 parts of kp1 daub, 30 parts of polyvinyl formal and 29 parts of epoxy resin; the compatilizer comprises the following components in parts by weight: 38 parts of maleic anhydride grafted ethylene and 21 parts of vinyl trimethoxy silane;
the antistatic agent comprises the following components in parts by weight: 22 parts of glycerol stearate and 18 parts of silicone oil.
Example four:
the invention discloses a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element,
the raw materials comprise the following components in parts by weight:
inner blank: 97 parts of polytetrafluoroethylene, 60 parts of beryllium copper, 45 parts of carbon fiber, 14 parts of molybdenum dioxide and 22 parts of binder;
outer blank: 69 parts of polytetrafluoroethylene, 18 parts of polyether-ether-ketone, 6 parts of beryllium copper, 39 parts of polyparaphenylene, 5 parts of a compatilizer and 6 parts of an antistatic agent.
Wherein:
the adhesive comprises the following components in parts by weight: 56 parts of kp1 daub, 35 parts of polyvinyl formal and 30 parts of epoxy resin.
The compatilizer comprises the following components in parts by weight: 45 parts of maleic anhydride grafted ethylene and 22 parts of vinyl trimethoxy silane.
The antistatic agent comprises the following components in parts by weight: 25 parts of glycerol stearate and 21 parts of silicone oil.
Example five:
the invention discloses a method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element,
the raw materials comprise the following components in parts by weight:
inner blank: 96 parts of polytetrafluoroethylene, 65 parts of beryllium copper, 43 parts of carbon fiber, 15 parts of molybdenum dioxide and 20 parts of binder;
outer blank: 66 parts of polytetrafluoroethylene, 20 parts of polyether-ether-ketone, 5 parts of beryllium copper, 39 parts of polyparaphenylene, 7 parts of a compatilizer and 8 parts of an antistatic agent.
Wherein:
the adhesive comprises the following components in parts by weight: 54 parts of kp1 daub, 37 parts of polyvinyl formal and 34 parts of epoxy resin.
The compatilizer comprises the following components in parts by weight: 44 parts of maleic anhydride grafted ethylene and 24 parts of vinyl trimethoxy silane.
The antistatic agent comprises the following components in parts by weight: 23 parts of glycerol stearate and 22 parts of silicone oil.
Example six:
a method for manufacturing enhanced polytetrafluoroethylene for a high and medium pressure valve seal comprises the following steps:
mixing raw materials:
mixing inner blanks: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 120 parts by weight of ethylene carbonate, and stirring at the rotating speed of 240r/min for 0.8 h; heating to 90 ℃, and extracting the solvent under vacuum to obtain an inner material; mixing outer blanks: adding polytetrafluoroethylene, polyether-ether-ketone, beryllium copper, polyparaphenylene, a compatilizer and an antistatic agent into 80 parts by weight of ethylene carbonate, and then stirring at the rotating speed of 200r/min for 0.5 h; heating to 100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 18MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, wherein the temperature rise process of the sintering furnace is as follows: raising the temperature from room temperature to 170 ℃ at the speed of 1.1 ℃/min, preserving heat for 16 min, then raising the temperature to 200 ℃ at the speed of 1 ℃/min, preserving heat for one hour, finally raising the temperature to 340 ℃ at the speed of 1 ℃/min, preserving heat for 30 min, and naturally cooling to room temperature after finishing preserving heat;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size die to enable the outer material to wrap the rough inner blank, and then compacting and forming under the forming pressure of 34MPa to obtain a rough final blank;
final firing: and (3) placing the rough final blank into a sintering furnace for sintering and forming, wherein the temperature rise process of the sintering furnace is as follows: heating from room temperature to 185 ℃ at the speed of 1.4 ℃/min, keeping the temperature for 20 min, heating to 235 ℃ at the speed of 1.3 ℃/min, keeping the temperature for one hour, heating to 380 ℃ at the speed of 1 ℃/min, keeping the temperature for 30 min, and naturally cooling to room temperature after the heat preservation is finished to obtain a product to be detected;
and (3) detection: and (4) inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product.
Wherein:
the adhesive comprises the following components in parts by weight: 16 parts of polydimethylsiloxane and 23-parts of phenolic resin.
Example seven:
a method for manufacturing enhanced polytetrafluoroethylene for a high and medium pressure valve seal comprises the following steps:
mixing raw materials:
mixing inner blanks: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 150 parts by weight of dimethyl carbonate, and stirring for 1h at the rotating speed of 280 r/min; heating to 90 ℃, and extracting the solvent under vacuum to obtain an inner material;
mixing outer blanks: adding polytetrafluoroethylene, polyether-ether-ketone, beryllium copper, polyparaphenylene, a compatilizer and an antistatic agent into 100 parts by weight of dimethyl carbonate, and then stirring at the rotating speed of 230r/min for 0.6 h; heating to 100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 20MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, wherein the temperature rise process of the sintering furnace is as follows: raising the temperature from room temperature to 170 ℃ at the speed of 1.1 ℃/min, preserving heat for 16 min, then raising the temperature to 200 ℃ at the speed of 1 ℃/min, preserving heat for one hour, finally raising the temperature to 340 ℃ at the speed of 1 ℃/min, preserving heat for 30 min, and naturally cooling to room temperature after finishing preserving heat;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size die to enable the outer material to wrap the rough inner blank, and then compacting and forming under the forming pressure of 37MPa to obtain a rough final blank;
final firing: and (3) placing the rough final blank into a sintering furnace for sintering and forming, wherein the temperature rise process of the sintering furnace is as follows: heating from room temperature to 185 ℃ at the speed of 1.4 ℃/min, keeping the temperature for 20 min, heating to 235 ℃ at the speed of 1.3 ℃/min, keeping the temperature for one hour, heating to 380 ℃ at the speed of 1 ℃/min, keeping the temperature for 30 min, and naturally cooling to room temperature after the heat preservation is finished to obtain a product to be detected;
and (3) detection: and (4) inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product.
Wherein:
the adhesive comprises the following components in parts by weight: 18 parts of polydimethylsiloxane and 30 parts of phenolic resin.
Example eight:
a method for manufacturing enhanced polytetrafluoroethylene for a high and medium pressure valve seal comprises the following steps:
mixing raw materials:
mixing inner blanks: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 160 parts by weight of propylene carbonate, and stirring at the rotating speed of 280r/min for 1 h; heating to 100 ℃, and extracting the solvent under vacuum to obtain an inner material;
mixing outer blanks: adding polytetrafluoroethylene, polyether ether ketone, beryllium copper, p-polyphenyl, a compatilizer and an antistatic agent into 100 parts by weight of propylene carbonate, and then stirring at the rotating speed of 230r/min for 0.7 h; heating to 100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 20MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, wherein the temperature rise process of the sintering furnace is as follows: raising the temperature from room temperature to 170 ℃ at the speed of 1.1 ℃/min, preserving heat for 16 min, then raising the temperature to 200 ℃ at the speed of 1 ℃/min, preserving heat for one hour, finally raising the temperature to 340 ℃ at the speed of 1 ℃/min, preserving heat for 30 min, and naturally cooling to room temperature after finishing preserving heat;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size die to enable the outer material to wrap the rough inner blank, and then compacting and forming under the forming pressure of 39MPa to obtain a rough final blank;
final firing: and (3) placing the rough final blank into a sintering furnace for sintering and forming, wherein the temperature rise process of the sintering furnace is as follows: heating from room temperature to 185 ℃ at the speed of 1.4 ℃/min, keeping the temperature for 20 min, heating to 235 ℃ at the speed of 1.3 ℃/min, keeping the temperature for one hour, heating to 380 ℃ at the speed of 1 ℃/min, keeping the temperature for 30 min, and naturally cooling to room temperature after the heat preservation is finished to obtain a product to be detected;
and (3) detection: and (4) inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product.
Wherein:
the solvent adhesive comprises the following components in parts by weight: 23 parts of polydimethylsiloxane and 36 parts of phenolic resin.
Comparative example one:
compared with the sixth example, the first comparative example does not add solvent, and the raw material ratio is the same as the first example.
Comparative example two:
compared with the sixth example, the second comparative example does not add any adhesive, and the raw material ratio is the same as that of the first example.
Comparative example three:
compared with the sixth example, the third comparative example mixes all the raw materials at one time, and the proportion of the raw materials is the same as that of the first example.
Comparative example four:
compared with the first example, the molecular weight of the polytetrafluoroethylene in the fourth comparative example is the same, and the preparation method is the same as that of the sixth example.
And (3) performance detection:
preparing corresponding samples according to corresponding preparation methods, then cutting the samples, keeping the sections of the inner blank and the outer blank of each sample identical, and then carrying out related performance detection on the cut samples.
TABLE 1
TABLE 2
| Performance of | Comparative example 1 | Comparative example No. two | Comparative example No. three | Comparative example No. four |
| Tensile strength MPa | 16 | 18 | 16 | 17 |
| Elongation at break% | 170 | 185 | 175 | 176 |
| Cracking of joint surface | Slight cracking | Cracking of | -- | Slight cracking |
According to the detection result, the whole sealing element prepared by the invention has good mechanical strength, the internal strength is greater than the external sealing part strength, so that the normal use of the sealing element is ensured, and meanwhile, in the sealing element disclosed by the invention, the external sealing part elasticity is greater than the internal elasticity, so that the sealing element disclosed by the invention can realize a better sealing effect.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A method for manufacturing enhanced polytetrafluoroethylene for a high-medium pressure valve sealing element is characterized by comprising the following steps:
the raw materials comprise the following components in parts by weight:
inner blank: 78-97 parts of polytetrafluoroethylene, 41-65 parts of beryllium copper, 29-45 parts of carbon fiber, 9-15 parts of molybdenum dioxide and 11-22 parts of binder;
outer blank: 42-69 parts of polytetrafluoroethylene, 13-20 parts of polyether-ether-ketone, 1-6 parts of beryllium copper, 23-39 parts of para-polyphenyl, 3-7 parts of a compatilizer and 2-8 parts of an antistatic agent;
the molecular weight of the polytetrafluoroethylene in the inner blank is 800-1000 ten thousand, and the molecular weight of the polytetrafluoroethylene in the outer blank is 1-3 ten thousand;
the preparation method comprises the following steps:
mixing raw materials:
mixing inner blanks: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 160 parts by weight of 120-fold solvent, and stirring at a rotating speed of 280r/min for 0.8-1 h; heating to 90-100 ℃, and extracting the solvent under vacuum to obtain an inner material;
mixing outer blanks: adding polytetrafluoroethylene, polyether ether ketone, beryllium copper, polyparaphenylene, a compatilizer and an antistatic agent into 80-100 parts by weight of a solvent, and then stirring at a rotating speed of 200-230r/min for 0.5-0.7 h; heating to 90-100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 18-20MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size mold, wrapping the rough inner blank with the outer material, compacting and molding at a molding pressure of 34-39MPa to obtain a rough final blank;
final firing: placing the rough finished blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature to obtain a product to be detected;
and (3) detection: and (4) inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product.
2. The method of claim 1, wherein the reinforced polytetrafluoroethylene for high and medium pressure valve seals comprises: the adhesive comprises the following components in parts by weight: 34-56 parts of kp1 daub, 23-37 parts of polyvinyl formal and 21-34 parts of epoxy resin.
3. The method of claim 2, wherein the reinforced polytetrafluoroethylene for high and medium pressure valve seals comprises: the compatilizer comprises the following components in parts by weight: 23-45 parts of maleic anhydride grafted polyethylene and 16-24 parts of vinyl trimethoxy silane.
4. The method of claim 3 wherein the reinforced polytetrafluoroethylene for high and medium pressure valve seals comprises: the solvent is one of dimethyl carbonate, ethylene carbonate and propylene carbonate.
5. The method of claim 4 wherein the reinforced polytetrafluoroethylene for high and medium pressure valve seals is prepared by: the antistatic agent comprises the following components in parts by weight: 17-25 parts of glycerol stearate and 13-22 parts of silicone oil.
6. The method of claim 5 wherein the reinforced polytetrafluoroethylene is selected from the group consisting of: the adhesive comprises the following components in parts by weight: 16-23 parts of polydimethylsiloxane and 23-36 parts of phenolic resin.
7. The method of claim 6 wherein the reinforced polytetrafluoroethylene is selected from the group consisting of:
the raw materials comprise the following components in parts by weight:
inner blank: 86 parts of polytetrafluoroethylene, 57 parts of beryllium copper, 33 parts of carbon fiber, 12 parts of molybdenum dioxide and 14 parts of binder;
outer blank: 60 parts of polytetrafluoroethylene, 17 parts of polyether-ether-ketone, 3 parts of beryllium copper, 32 parts of polyparaphenylene, 6 parts of a compatilizer and 5 parts of an antistatic agent;
the preparation method comprises the following steps:
mixing raw materials:
inner blank: adding polytetrafluoroethylene, beryllium copper, carbon fiber, molybdenum dioxide and an adhesive into 150 parts by weight of dimethyl carbonate, and stirring for 1h at the rotating speed of 280 r/min; heating to 90 ℃, and extracting the solvent under vacuum to obtain an inner material;
outer blank: adding polytetrafluoroethylene, polyether-ether-ketone, beryllium copper, polyparaphenylene, a compatilizer and an antistatic agent into 100 parts by weight of dimethyl carbonate, and then stirring at the rotating speed of 230r/min for 0.6 h; heating to 100 ℃, and extracting the solvent under vacuum to obtain an external material;
forming an inner blank: putting the inner material into a small mold, compacting and molding at the molding pressure of 20MPa to obtain a rough inner blank;
primary firing of an inner blank: placing the rough inner blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature;
forming an outer blank: coating an adhesive on the surface of the fired inner blank, putting the rough inner blank and the outer material into a large-size die to enable the outer material to wrap the rough inner blank, and then compacting and forming under the forming pressure of 37MPa to obtain a rough final blank;
final firing: placing the rough finished blank into a sintering furnace for sintering and forming, and then naturally cooling to room temperature to obtain a product to be detected;
and (3) detection: inspecting the product to be inspected through appearance, hardness, size, parallelism, coaxiality and flatness, obtaining the product after the product is qualified, and finally packaging and warehousing the product;
wherein:
the adhesive comprises the following components in parts by weight: 45 parts of kp1 daub, 30 parts of polyvinyl formal and 29 parts of epoxy resin;
the compatilizer comprises the following components in parts by weight: 38 parts of maleic anhydride grafted polyethylene and 21 parts of vinyl trimethoxy silane;
the antistatic agent comprises the following components in parts by weight: 22 parts of glycerol stearate and 18 parts of silicone oil;
the adhesive comprises the following components in parts by weight: 18 parts of polydimethylsiloxane and 30 parts of phenolic resin.
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