JP2004251368A - Manufacturing method for seat ring for valve, and manufacturing method for valve element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a seat ring for a valve and a valve element which have sufficient elasticity and high chemical resistance, and prevent deterioration even if stress is repeatedly applied. <P>SOLUTION: A seat ring 15 of a ball valve 10 is configured by a composite member equipped with a ring shaped elastomer cured material 151 and a fluorocarbon resin seat 152 laminated on a face side which is brought into contact with a fluid of the elastomer cured material 151. When manufacturing the seat ring 15 by the composite member, after reforming at least one face of the resin seat ring by discharge treatment under a prescribed gaseous atmosphere, a joining reinforcing agent is coated onto the deformed face. Subsequently, unvulcanized elastomer composition containing a vulcanized agent is heated and pressurized in a mold under the state brought into contact with the joining reinforcing agent coated face of the resin seat. By so doing, the resin seat and the elastomer cured material are joined and integrated to form the seat ring 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method for manufacturing a valve seat ring that seals movement of a fluid by interposing a contact line between a valve seat of a valve box and a valve seat of a valve body, and is driven in an opening direction and a closing direction of a fluid passage. And a method of manufacturing a valve body for controlling the movement of a fluid. More specifically, the present invention relates to a technique for manufacturing a composite member provided with a resin sheet in contact with a fluid and a cured elastomer body lining the resin sheet in a valve seat ring or valve body.
[0002]
[Prior art]
In a ball valve, a valve seat ring that seals the movement of fluid by interposing a contact line between a valve seat of a valve box and a valve seat of a valve body, or a diaphragm valve is driven in an opening direction and a closing direction of a fluid passage. In the case of a diaphragm (valve) for controlling the movement of a fluid, a single elastomer cured body or a single PTFE is used.
[0003]
However, since the cured elastomer has insufficient chemical resistance, deterioration or elution of components into the fluid becomes a problem. Further, there is a problem that if the contact state is continued for a long period of time, adhesiveness is developed, and it is easily deteriorated and damaged when separated.
[0004]
On the other hand, PTFE alone has high chemical resistance and does not exhibit tackiness, but is inferior in terms of elasticity and the like as compared with the cured elastomer. Further, when the seat ring of the ball valve is composed of PTFE alone, since the expansion coefficient is high and the rigidity is high, when the seat ring is constrained, it expands at a high temperature to press the valve body, and the rotational torque of the valve body is increased. And opening and closing becomes difficult.
[0005]
Therefore, it has been proposed to use a composite member in which the side in contact with the fluid is made of a resin sheet and this resin sheet is lined with a cured elastomer, for a valve seat ring or a valve body (for example, Patent Document 1, 2).
[0006]
[Patent Document 1]
JP-A-2000-161505
[Patent Document 2]
JP-A-9-196200
[0007]
Further, a technique has been proposed in which a fluororesin sheet is bonded to a soft vinyl chloride resin, a polyethylene resin, a urethane resin, or a stainless steel plate by using discharge treatment (for example, see Patent Documents 3 and 4).
[0008]
[Patent Document 3]
JP-A-10-273546 (pages 3 to 4)
[Patent Document 4]
JP-A-10-306166 (pages 3-4)
[0009]
[Problems to be solved by the invention]
However, when manufacturing the composite member described in Patent Documents 1 and 2, a resin sheet is simply adhered to the surface of an elastomer cured body with an adhesive, and a valve sheet ring or a valve body to which stress is repeatedly applied. However, there is a problem that the resin sheet is peeled off from the cured elastomer when it is used.
[0010]
In view of the above problems, an object of the present invention is to provide a valve seat ring and a method of manufacturing a valve body that have sufficient elasticity and high chemical resistance and do not deteriorate even when stress is repeatedly applied.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a valve seat ring for sealing the movement of fluid by interposing a contact portion between an inner wall of a valve body and a valve body, the ring-shaped elastomer cured body, In a method for manufacturing a valve seat ring composed of a composite member having a resin sheet laminated on a side of a cured elastomer body that comes into contact with a fluid, at least one surface of the resin sheet is modified by a discharge treatment under a predetermined gas atmosphere. After the heat treatment, the uncured elastomer composition containing the vulcanizing agent is heated and pressurized in a state of being stacked on the modified surface via a bonding reinforcing agent, so that the resin sheet and the elastomer cured body are And the composite member is molded. For example, after modifying at least one surface of a resin sheet by a discharge treatment under a predetermined gas atmosphere, a bonding reinforcing agent is applied to the modified surface, and thereafter, an unvulcanized elastomer composition containing a vulcanizing agent By heating and pressing the object in contact with the surface of the resin sheet to which the bonding reinforcing agent is applied, the resin sheet and the cured elastomer are joined and integrated, and the composite member is molded.
[0012]
Further, according to the present invention, there is provided a valve body which is driven in an opening direction and a closing direction of a fluid passage in a valve body to control movement of a fluid, and is driven in an opening direction and a closing direction of a fluid passage in the valve body. A valve body for controlling movement of a fluid, wherein the resin sheet is a method for manufacturing a valve body comprising a composite member comprising an elastomer cured body and a resin sheet laminated on a side of the elastomer cured body that contacts the fluid. After at least one surface is modified by a discharge treatment under a predetermined gas atmosphere, an unvulcanized elastomer composition containing a vulcanizing agent is overlaid on the modified surface via a bonding reinforcing agent. The resin sheet and the elastomer cured body are joined and integrated by heating and pressurizing at a time, and the composite member is molded. For example, after modifying at least one surface of a resin sheet by a discharge treatment under a predetermined gas atmosphere, a bonding reinforcing agent is applied to the modified surface, and thereafter, an unvulcanized elastomer composition containing a vulcanizing agent By heating and pressing the object in contact with the surface of the resin sheet to which the bonding reinforcing agent is applied, the resin sheet and the cured elastomer are joined and integrated, and the composite member is molded.
[0013]
Here, after modifying at least one surface of the fluororesin sheet as a resin sheet by a low-temperature plasma treatment under a gas atmosphere under a pressure of 0.1 to 1.1 kg / cm ² , A silane coupling agent as a bonding reinforcing agent is applied to the modified surface, and thereafter, the unvulcanized elastomer composition containing the vulcanizing agent is in contact with the silane coupling agent applied surface of the fluororesin sheet. It is preferable that the fluorinated resin sheet and the cured elastomer are joined and integrated by heating and pressing, and the composite member is molded.
[0014]
According to another aspect of the present invention, there is provided a valve seat ring interposed at a contact portion between an inner wall of a valve body and a valve body to seal a movement of a fluid. In a method for manufacturing a valve seat ring comprising a composite member having a resin sheet laminated on a side in contact with a fluid, at least one surface of the resin sheet is modified by a discharge treatment under a predetermined gas atmosphere to reinforce bonding. By heating and pressing an unvulcanized elastomer composition containing a vulcanizing agent and a vulcanizing agent in contact with the modified surface of the resin sheet, the resin sheet and the elastomer cured body are joined and integrated, and It is characterized by forming a composite member.
[0015]
A valve body driven in the opening direction and the closing direction of the fluid passage in the valve body to control the movement of the fluid, wherein the elastomer cured body and a resin sheet laminated on the side of the elastomer cured body that comes into contact with the fluid In a method of manufacturing a valve body comprising a composite member comprising: an unvulcanized elastomer containing at least one surface of a resin sheet modified by a discharge treatment under a predetermined gas atmosphere and containing a bonding reinforcing agent and a vulcanizing agent. By heating and pressing the composition in contact with the modified surface of the resin sheet, the resin sheet and the cured elastomer are joined and integrated, and the composite member is molded.
[0016]
Here, after at least one surface of the fluororesin sheet is modified by low-temperature plasma treatment under a gas atmosphere under a pressure of 0.1 to 1.1 kg / cm ² , a silane coupling agent as a bonding reinforcing agent, By heating and pressing the unvulcanized elastomer composition containing the vulcanizing agent in contact with the modified surface of the fluororesin sheet, the fluororesin sheet and the cured elastomer are joined and integrated, and Preferably, a composite member is formed.
[0017]
The composite member according to the present invention has sufficient elasticity since the base is made of the cured elastomer, and has a resin sheet laminated on the surface thereof. Therefore, the fluid comes into contact with the resin sheet but does not come into contact with the cured elastomer, so that the components contained in the cured elastomer do not elute into the fluid and the cured elastomer does not deteriorate. Further, in the present invention, the surface of the resin sheet is modified by a discharge treatment under a predetermined gas atmosphere, and a bonding reinforcing agent such as a silane coupling agent or an adhesive is used. With the vulcanized elastomer composition in contact with the surface of the resin sheet, it is heated and pressed in a mold, or rolled with a roll or the like, and then simply heated, and the resin sheet and the cured elastomer are firmly joined and integrated. be able to. Therefore, even if stress is repeatedly applied to the composite member, the resin sheet does not peel off from the cured elastomer.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0019]
[Configuration for ball valve]
1A and 1B are a half sectional view showing a structure of a ball valve to which the present invention is applied, and a sectional view of a seat ring used for the ball valve, respectively.
[0020]
As shown in FIG. 1A, the ball valve 10 of the present embodiment includes a ball-shaped valve element 13 having a hole 12 formed in a valve body 11, and by rotating the valve element 13, Open and close the flow path. In the valve body 11, a seat ring 15 (valve seat ring) that seals the movement of the fluid through the contact portion between the inner wall of the valve body 11 and the valve body 13 is disposed.
[0021]
In this embodiment, as shown in FIG. 1B, the portion of the seat ring 15 that contacts the inner wall or the like of the valve body 11 is a flat surface that is orthogonal, while the surface 153 that contacts the liquid is curved. Face. Here, the seat ring 15 is composed of a composite member including a ring-shaped elastomer cured body 151 and a fluorine-based resin sheet 152 laminated on a surface 153 of the elastomer cured body 151 that is in contact with the fluid. I have.
[0022]
Therefore, in the ball valve 10 of the present embodiment, the composite member forming the seat ring 15 has sufficient elasticity. Further, in the seat ring 15, since the surface of the cured elastomer 151 is covered with the resin sheet 152, the fluid contacts the resin sheet 152 but does not contact the cured elastomer 151. Therefore, the components contained in the cured elastomer 151 do not elute into the fluid, and the cured elastomer 151 is not deteriorated by the fluid.
[0023]
Further, since the valve body 15 is in contact with the resin sheet 152, even if the state in which the seat ring 15 and the valve body 13 are in contact for a long period of time, the seat ring 15 and the valve body 13 adhere to each other. It doesn't even happen. In addition, since the base of the seat ring 15 is made of the cured elastomer 151, the problem that the seat ring 15 expands when the temperature is high and the rotational torque of the valve body 13 increases can be avoided.
[0024]
[Configuration of diaphragm valve]
FIG. 2 is a sectional view showing the structure of a diaphragm valve to which the present invention is applied.
[0025]
2, the diaphragm valve 20 of the present embodiment has an inlet channel 22 and an outlet channel 23 formed inside a valve body 21, and a partition wall 24 formed between the two channels. In addition, a compressor 25 is disposed above the valve body 21, and the compressor 25 is fixed to a lower end of a spindle 26. A diaphragm 28 (valve element) that is driven in the opening direction and the closing direction of the flow path in the valve body 21 to control the movement of the fluid is fixed to a lower part of the compressor 25. In the present embodiment, the diaphragm 28 is It is composed of a composite member including a sheet-shaped cured elastomer 281 and a fluorine-based resin sheet 282 laminated on the surface of the cured elastomer 281 that comes into contact with the fluid.
[0026]
In the diaphragm valve 20 configured as described above, when the handle is rotated, the rotation of the handle lowers the spindle 26 and lowers the compressor 25. Then, when the compressor 25 descends, the diaphragm 28 is pressed, and the diaphragm 28 is pressed by the partition wall 24 to close the flow paths 22 and 23. As a result, the diaphragm valve 20 is closed.
[0027]
As described above, the diaphragm valve 20 of the present embodiment has sufficient elasticity because the base of the diaphragm 28 is formed of the cured elastomer 281. Further, in the diaphragm 28, since the surface of the cured elastomer 281 is covered with the resin sheet 282, the fluid comes into contact with the resin sheet 282 but does not contact the cured elastomer 281. Therefore, the components contained in the cured elastomer 281 do not elute into the fluid, and the cured elastomer 281 is not deteriorated by the fluid.
[0028]
[First manufacturing method]
In manufacturing such a sheet ring 15 or the diaphragm 28, in this embodiment, at least one surface of the resin sheet is modified by a discharge treatment in a predetermined gas atmosphere, and then a bonding reinforcing agent is coated on the modified surface with a silane cup. A ring agent is applied, and thereafter, an unvulcanized elastomer composition containing a vulcanizing agent is heated and pressed in a mold in a state of being in contact with a bonding reinforcing agent applied surface of the resin sheet, so that the resin sheet and the elastomer are cured. The cured body is joined and integrated, and a composite member is formed. Specifically, at least one surface of the fluororesin sheet as a resin sheet is modified by low-temperature plasma treatment under a gas atmosphere at a pressure of 0.1 to 1.1 kg / cm ² , and then the fluororesin is modified. A silane coupling agent as a bonding reinforcing agent was applied to the modified surface of the sheet, and thereafter, the unvulcanized elastomer composition containing the vulcanizing agent was brought into contact with the silane coupling agent applied surface of the fluororesin sheet. By heating and pressing in a mold in this state, the fluororesin sheet and the cured elastomer are joined and integrated, and a composite member is formed.
[0029]
The low-temperature plasma treatment performed here is a treatment performed using plasma generated in a region where the electron temperature is high but the gas temperature is low (also referred to as non-equilibrium plasma). This is a technique in which radicals, vacuum ultraviolet rays, and the like are applied to the material surface to perform surface modification such as etching, implantation, and radical generation to activate the surface. At the time of this implantation, functional groups such as a hydroxyl group, a carbonyl group, and a carboxyl group are introduced into the surface of the material, and the effects of improving adhesion and improving wettability can be obtained. These act on the silane coupling agent and the vulcanizing agent of the unvulcanized elastomer composition to not only significantly improve the adhesiveness but also generate a strong composite interface that can withstand various stresses.
[0030]
Examples of the gas used for the low-temperature plasma treatment include an inert gas such as He, Ar, Ne, Kr, and Xe; a carbon oxide gas such as CO ₂ and CO; an oxidizing gas such as O _{2; and} a reactive gas such as CF _4. , Ethylene, propylene and other polymerizable unsaturated compound gases, air and the like. These are appropriately selected according to the purpose, and used alone or in combination. However, in the present invention, since the low-temperature plasma treatment is performed under a pressure of 0.1 to 1.1 kg / cm ² , the inert gas, the carbon oxide gas, and the polymerizable unsaturated compound gas are preferably used. It is preferable to use a mixed gas of the above, and particularly to use a mixed gas of Ar, CO ₂ and ethylene.
[0031]
When a mixed gas is used, it is preferable to mix 1 to 15 mol of the polymerizable unsaturated compound gas and 1 to 20 mol of the carbon oxide gas with respect to 100 mol of the inert gas. 3 to 10 moles of the polymerizable unsaturated compound gas and 1 to 12 moles of the carbon oxide gas are mixed with 100 moles of the gas. This is because when the blending ratio of the polymerizable unsaturated compound gas and the carbon oxide gas increases, the initial discharge voltage increases and the discharge treatment becomes difficult.
[0032]
The discharge treatment is performed by exposing the surface of the resin sheet to be treated in a predetermined gas atmosphere, and applying a high-frequency voltage of, for example, 3 to 40 kHz between the electrodes. The temperature during the discharge treatment is not particularly limited, but is usually preferably in the range of 10 to 80 ° C, and more preferably in the range of 25 to 60 ° C.
[0033]
In the present invention, the low-temperature plasma treatment is performed under a pressure of 0.1 to 1.1 kg / cm ^{2 for} the following reason. That is, if it is attempted to perform the process under a pressure of less than 0.1 kg / cm ^{2, a} special device is required because the system needs to be kept in a vacuum, and the equipment cost increases and the gas density decreases. This is because a modified surface cannot be obtained. On the other hand, if it exceeds 1.1 kg / cm ² , no further processing effect can be obtained despite the increased gas consumption, which is not economical.
[0034]
In manufacturing the composite member, the surface of the resin sheet was modified by low-temperature plasma treatment under a predetermined gas atmosphere, and a bonding reinforcing agent such as a silane coupling agent or an adhesive was used. The resin sheet and the cured elastomer can be firmly joined and integrated only by heating and pressing in a mold while the unvulcanized elastomer composition containing the agent is in contact with the surface of the resin sheet. Therefore, even if stress is repeatedly applied to the composite member, the resin sheet does not peel off from the cured elastomer. In addition, even if the unvulcanized elastomer composition containing the vulcanizing agent is rolled with a roll or the like in a state of being in contact with the surface of the resin sheet, and then heated, the resin sheet and the cured elastomer can be strongly bonded and integrated. Can be.
[0035]
In such a composite member, a sheet-like fluorine-based resin sheet is preferably used as the resin sheet. The fluororesin sheet is excellent in weather resistance, stain resistance, slidability, chemical resistance, heat resistance, and hot water resistance. If necessary, various fillers (such as graphite, short fibers such as carbon and glass, and molybdenum disulfide) may be blended. In particular, when characteristics such as folding resistance and high tear strength are required, it is preferable to select these other components in consideration of these.
[0036]
Specific examples of the fluorine-based resin include ethylene tetrafluoride (PTFE), ethylene tetrafluoride-ethylene copolymer (ETFE), ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer (PFA), and trifluorinated chloride. There are ethylene (PCTFE), propylene hexafluoride copolymer (FEP), and the like. Among them, ETFE and PFA are particularly preferable from the viewpoints of easy handling, availability, and price.
[0037]
Examples of the unvulcanized elastomer composition include a composition obtained by blending an uncured elastomer component, a vulcanizing agent, and an appropriate filler if necessary. As the elastomer component, various types are used, and chloroprene rubber, silicon rubber, IIR, EPDM, NBR, fluororubber and the like are suitable.
[0038]
Examples of the vulcanizing agent used in combination with the elastomer component include an organic peroxide, a metal oxide, and a polyol. Various organic peroxides are used, and among them, dialkyl peroxides are preferable.
[0039]
Specific examples of the dialkyl peroxide include di-t-butyl peroxide, di-t-amyl peroxide, t-butyl cumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5- Di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane- (3), α, α′-bis (t-butylperoxy) diisopropylbenzene, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,3-bis (t-butylperoxyisopropyl) benzene, n-butyl-4,4-bis (t-butyl) Peroxy) valerate, 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane, 2,2-bis- (t-butylperoxy) butane, 1,1 Di - (t-butylperoxy) cyclohexane, and the like. Among them, dicumyl peroxide and 2,5-dimethyl-2,5-di (t-butylperoxy) hexane are particularly preferred because they are relatively easy to handle and generally available. Examples of the metal oxide include ZnO, MgO, PbO, and Pb ₃ O ₄ .
[0040]
Further, specific examples of the silane coupling agent (bonding reinforcing agent) applied to the modified surface of the resin sheet obtained by the low-temperature plasma treatment include γ-methacryloxypropyltriethoxysilane and γ-methacryloxypropylmethyldimethoxysilane. Γ-methacryloxypropylmethyldiethoxysilane, γ-methacryloxypropylmethoxysilane, N-β- (aminoethyl) γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) γ-aminopropylmethyldimethoxysilane , N-β- (aminoethyl) γ-aminopropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyl propyltrimethoxysilane, γ-glycidoxypropylmethyldi Ethoxysilane, γ-glycidoxypro Pilltriethoxysilane, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-isocyanatopropyltriethoxysilane, and the like. However, among these silane coupling agents, amino-functional silane compounds are effective adhesion promoters. However, when they are used in large amounts, they will cause significant discoloration when continuously exposed to high temperatures of about 100 ° C. In addition, it is preferable not to use it alone as much as possible, since the curing force deteriorates and the adhesive strength decreases. Further, the use of isocyanate-based silane coupling can provide a bonding surface having a high strength that is substantially constant or higher irrespective of the material to be bonded and the bonding mode, and is therefore suitable for a wide range of applications.
[0041]
These silane coupling agents may be used as they are, or when they are difficult to use as they are, they may be diluted with water, a solvent, or the like from the viewpoint of coating workability. In this case, the dilution ratio depends on the type of the silane coupling agent and the type of the elastomer component to be bonded, but is preferably set to 1.1 to 20 times in terms of workability.
[0042]
The amount of the silane coupling agent (including the diluting liquid) applied to the modified surface of the resin sheet is not particularly limited, but is usually preferably set to 10 to 40 g / m ² . That is, if the application amount is less than 10 g / m ² , the adhesive force is difficult to stabilize. On the contrary, if it exceeds 40 g / m ² , the resin exudes in a direction parallel to the application surface due to pressure during injection molding or compression molding. This is because there is a possibility that the molding die will be soiled and the removal of the molded product will be hindered.
[0043]
The method for applying the silane coupling agent is not particularly limited, and any application method may be used. However, spray application is preferred in terms of uniform application.
[0044]
Usually, when a silane coupling agent is used to reinforce the bonding between two materials, apply the silane coupling agent to one material surface, dry the applied surface, and then join the other material. Generally, in the present invention, in a state where the silane coupling agent applied to the modified surface of the resin sheet is undried, the surface is immediately brought into contact with the unvulcanized elastomer composition and heated. Alternatively, it is preferable that both are integrally formed by heating and pressing, since a bonding interface with higher strength can be obtained.
[0045]
That is, in order to join the resin sheet and the cured elastomer at a high strength, the wettability of the unvulcanized elastomer composition to the resin sheet is considered to have a great effect. When it is brought into contact with the vulcanized elastomer composition as it is and molded and integrated in one step by heating or heating and pressurizing, the silane coupling agent wets the modified surface of the resin sheet under the contact pressure of the unvulcanized elastomer composition. And the wetting of the silane coupling agent to the unvulcanized elastomer composition is simultaneously realized, and at this time, the silane coupling agent and the unvulcanized elastomer composition come into contact with each other and the flow of the unvulcanized elastomer composition Are mixed and diffused with each other. As a result, the interface of the low-temperature plasma-treated surface / silane coupling agent / unvulcanized elastomer composition is crosslinked by the action of the vulcanizing agent in a state where the three components coexist, and an unprecedented high-strength bonding interface is obtained. it is conceivable that.
[0046]
The “undried state” of the silane coupling agent means a state immediately after the application operation without leaving the silane coupling agent applied surface for drying or subjecting the silane coupling agent to air drying or the like.
[0047]
Of the silane coupling agents described above, methacryloxy-based silane coupling agents containing a methacryloxy group are generally prepared by preparing an aqueous solution thereof, spraying the prepared solution on a target surface, and drying it to effect a coupling effect. In the present invention, the methacryloxy-based silane coupling agent is applied as it is to the modified surface of the resin sheet as it is in the form of an undiluted solution. A suitable bonding interface can be formed. In addition, according to the methacryloxy-based silane coupling agent, the process can be greatly simplified, and a product excellent in bonding strength can be obtained. It is considered that this is because the methacryloxy group of the methacryloxy-based silane coupling agent is directly supplied to the modified surface without hydrolysis and directly participates in crosslinking via the vulcanizing agent.
[0048]
In the present invention, the heating or heating and pressurizing conditions for curing the unvulcanized elastomer composition depend on the type of the elastomer composition and the size and thickness of the target cured product, but usually, the heating temperature is set to a predetermined value. It is preferable that the heating temperature is 120 to 180 ° C. and the heating time is 1 to 60 minutes. The pressurizing condition is appropriately set according to the type of the molding apparatus and the like.
[0049]
The molding apparatus is not particularly limited, but a general injection molding machine, a pressure molding machine, or the like can be used.
[0050]
In the composite member obtained in this manner, even when a fluorine-based resin sheet is used as the resin sheet, a dense and uniform surface treatment by low-temperature plasma treatment performed in a special pressure range, and a silane coupling agent Combined with the composite crosslinking effect with the vulcanizing agent contained in the unvulcanized elastomer composition, the bonding surface between the fluororesin sheet and the cured elastomer is integrated with an unprecedented high strength. You.
[0051]
[Modification of First Manufacturing Method]
In the first manufacturing method, after the resin sheet is modified by electric discharge treatment, a bonding reinforcing agent is applied to the modified surface. However, the bonding reinforcing agent is applied to the unvulcanized elastomer composition containing the vulcanizing agent. , An unvulcanized elastomer composition containing a vulcanizing agent may be overlaid on the modified surface of the resin sheet via a bonding reinforcing agent, and then heated and pressed.
[0052]
[Second manufacturing method]
In manufacturing the composite member constituting the seat ring 15 or the diaphragm 28 described with reference to FIGS. 1 and 2, at least one surface of the resin sheet is modified by a discharge treatment under a predetermined gas atmosphere, and the bonding is performed. The uncured elastomer composition containing a silane coupling agent as a reinforcing agent and a vulcanizing agent is heated and pressurized in a mold in contact with the modified surface of the resin sheet to cure the resin sheet and the elastomer. Along with joining and integrating the body, a composite member may be molded. Specifically, after modifying at least one surface of the fluororesin sheet by low-temperature plasma treatment under a pressure of 0.1 to 1.1 kg / cm ^{2 in} a gas atmosphere, silane coupling as a bonding reinforcing agent is performed. The non-vulcanized elastomer composition containing the vulcanizing agent and the vulcanizing agent is heated and pressurized in a mold while in contact with the modified surface of the fluororesin sheet, thereby joining the fluororesin sheet and the cured elastomer. At the same time, the composite member is molded.
[0053]
In this case, the above-mentioned thing can be used as a silane coupling agent. However, in the case of applying a silane coupling material, in consideration of the application workability, in addition to using the silane coupling agent as it is, there is a case where a solvent-diluted material is used. When the silane coupling agent is contained in the vulcanized elastomer composition, the silane coupling agent may be blended without dilution.
[0054]
Here, the compounding ratio of the silane coupling agent is not particularly limited, but particularly, 0.1 to 2.0 parts by weight based on 100 parts by weight of the unvulcanized elastomer composition (hereinafter abbreviated as “parts”). It is preferable to set to zero. That is, if the compounding ratio is less than 0.1 part, the bonding interface strength of the obtained composite material may not be stable, and if it exceeds 2.0 parts, the mechanical strength of the elastomer cured product in the obtained composite material may be reduced. This is because the characteristics may be impaired.
[0055]
[Another manufacturing method]
In the above embodiment, the low-temperature plasma treatment was performed as the discharge treatment, but a discharge treatment in a mixed gas composed of an argon gas, a nitrogen gas, and a carbon dioxide gas may be used. Here, the role of the argon gas is to remove deteriorating substances on the surface of the fluororesin sheet and activate the surface while suppressing the main chain breakage of the fluororesin, thereby causing a reaction by nitrogen gas and carbon dioxide gas. . The role of the nitrogen gas and the carbon dioxide gas is to effectively introduce an oxygen-containing functional group and a nitrogen-containing functional group into the discharge treated surface. The composition of the mixed gas is preferably 1 to 10 mol of nitrogen gas and 1 to 15 mol of carbon dioxide gas with respect to 100 mol of argon gas, and most preferably 3 to 10 mol of nitrogen gas with respect to 100 mol of argon gas. 5 moles and carbon dioxide gas is 3 to 10 moles. When the amounts of the nitrogen gas and the carbon dioxide gas are larger than those of the argon gas, the initial discharge voltage becomes higher, and it becomes difficult to perform the discharge treatment. In addition, if air is mixed in this atmosphere, it becomes difficult to discharge, so it is necessary to avoid air.
[0056]
Further, a discharge treatment in a mixed gas of an inert gas, a polymerizable unsaturated compound gas and a carbon oxide gas may be used. In this case, the role of the inert gas is to stabilize the discharge, remove deteriorating substances on the surface of the fluorine-based resin sheet, and activate the surface of the fluorine-based resin sheet while suppressing the breakage of the polymer main chain, thereby polymerizing the unsaturated resin. It is to cause a reaction by the compound gas and the carbon oxide gas. In this case, examples of the inert gas include helium gas, argon gas, neon gas, krypton gas, xenon gas, and radon gas. Helium gas and argon gas are preferable, and argon gas is particularly preferable. Examples of the polymerizable unsaturated compound gas include a compound gas having a double bond such as ethylene gas and propylene gas, and ethylene gas is preferable. Further, as the carbon oxide gas, the role of effectively introducing an oxygen functional group into the surface polymer is carbon dioxide gas, carbon monoxide.In particular, the carbon dioxide gas is firmly attached to the surface of the fluororesin sheet. This is preferable because a surface reactant that adheres can be obtained. The composition of the mixed gas is preferably 1 to 15 mol of the polymerizable unsaturated compound gas and 1 to 20 mol of the carbon oxide gas with respect to 100 mol of the inert gas, and most preferably 100 mol of the inert gas. The amount of the polymerizable unsaturated compound gas is 3 to 10 mol and the amount of the carbon oxide gas is 1 to 12 mol with respect to the mol. When the amount of the polymerizable unsaturated compound gas and the amount of the carbon oxide gas are larger than the amount of the inert gas, the initial discharge voltage becomes higher and the discharge treatment becomes difficult. In addition, if air is mixed in this atmosphere, it becomes difficult to discharge, so it is necessary to avoid air.
[0057]
Further, as the discharge treatment, corona discharge (spark discharge), glow discharge, or the like can be applied in addition to plasma discharge. In either case, the treatment surface is exposed to a gas atmosphere, and a discharge treatment is performed by applying a high-frequency voltage of 3 kHz to 40 kHz between the electrodes. The form of the discharge varies depending on the composition of the mixed gas. As described above, when the amount of the nitrogen gas and the amount of the carbon dioxide gas with respect to the argon gas increase, the plasma discharge or the glow discharge changes to a corona discharge (spark discharge). The pressure at the time of the M discharge treatment is not particularly limited as long as the mixed gas can be maintained in a gaseous state, but may be usually in the range of 0.9 to 1.1 kg / cm ² . Since the surface treatment is performed under atmospheric pressure, it is preferable in that an expensive device is not required. The temperature during the discharge treatment is not particularly limited, but may be generally in the range of 10 to 80 ° C, and preferably in the range of 25 to 60 ° C.
[0058]
In the above embodiment, a silane coupling agent was used as a bonding reinforcing agent, but a polyester adhesive, a urethane adhesive, an epoxy adhesive, a nylon adhesive, an ethylene-vinyl acetate adhesive, an acrylic adhesive An adhesive such as an adhesive or a rubber-based adhesive may be used.
[Brief description of the drawings]
FIGS. 1A and 1B are a half sectional view of a ball valve to which the present invention is applied and an explanatory view of a seat ring used for the ball valve.
FIG. 2 is a cross-sectional view of a diaphragm valve to which the present invention is applied.
[Explanation of symbols]
10 Ball valve 11 Valve body 13 Ball-shaped valve element 15 Seat ring (Seat ring for valve)
151 Elastomer cured body 152 Resin sheet 20 Diaphragm valve 22 Inlet flow path 23 Outlet flow path 24 Partition wall 25 Compressor 26 Spindle 28 Diaphragm (valve element)
281 Elastomer cured body 282 Resin sheet

Claims (6)

A valve seat ring interposed at a contact portion between an inner wall of a valve body and a valve body to seal a movement of a fluid, and is laminated on a ring-shaped elastomer cured body and a side of the elastomer cured body that comes into contact with the fluid. In a method for manufacturing a valve seat ring comprising a composite member having a resin sheet,
After modifying at least one surface of the resin sheet by a discharge treatment under a predetermined gas atmosphere, an unvulcanized elastomer composition containing a vulcanizing agent is applied to the modified surface via a bonding reinforcing agent. A method for manufacturing a valve seat ring, wherein the resin sheet and the elastomer cured body are joined and integrated by heating and pressing in a stacked state, and the composite member is molded. A valve seat ring interposed at a contact portion between an inner wall of a valve body and a valve body to seal a movement of a fluid, and is laminated on a ring-shaped elastomer cured body and a side of the elastomer cured body that comes into contact with the fluid. In a method for manufacturing a valve seat ring comprising a composite member having a resin sheet,
After modifying at least one surface of the resin sheet by a discharge treatment under a predetermined gas atmosphere, a bonding reinforcing agent is applied to the modified surface, and thereafter, an unvulcanized elastomer composition containing a vulcanizing agent is prepared. By heating and pressurizing the resin sheet in contact with the joint reinforcing agent application surface of the resin sheet, the resin sheet and the elastomer cured body are joined and integrated, and the composite member is molded, and the valve sheet is characterized in that Ring manufacturing method. A valve seat ring interposed at a contact portion between an inner wall of a valve body and a valve body to seal a movement of a fluid, and is laminated on a ring-shaped elastomer cured body and a side of the elastomer cured body that comes into contact with the fluid. In a method for manufacturing a valve seat ring comprising a composite member having a resin sheet,
At least one surface of the resin sheet is modified by a discharge treatment under a predetermined gas atmosphere, and an unvulcanized elastomer composition containing a bonding reinforcing agent and a vulcanizing agent is in contact with the modified surface of the resin sheet. A method for manufacturing a valve seat ring, wherein the resin sheet and the cured elastomer are joined and integrated by heating and pressing, and the composite member is molded. A valve body that is driven in an opening direction and a closing direction of a fluid passage in a valve body to control movement of a fluid, comprising: a cured elastomer body; and a resin sheet laminated on a side of the cured elastomer body that contacts the fluid. In a method of manufacturing a valve body comprising a composite member provided,
After modifying at least one surface of the resin sheet by a discharge treatment under a predetermined gas atmosphere, an unvulcanized elastomer composition containing a vulcanizing agent is applied to the modified surface via a bonding reinforcing agent. A method for manufacturing a valve seat ring, wherein the resin sheet and the elastomer cured body are joined and integrated by heating and pressing in a stacked state, and the composite member is molded. A valve body that is driven in an opening direction and a closing direction of a fluid passage in a valve body to control movement of a fluid, comprising: a cured elastomer body; and a resin sheet laminated on a side of the cured elastomer body that contacts the fluid. In a method of manufacturing a valve body comprising a composite member provided,
After modifying at least one surface of the resin sheet by a discharge treatment under a predetermined gas atmosphere, a bonding reinforcing agent is applied to the modified surface, and thereafter, an unvulcanized elastomer composition containing a vulcanizing agent is prepared. By heating and pressurizing the resin sheet in contact with the joint reinforcing agent application surface of the resin sheet, the resin sheet and the elastomer cured body are joined and integrated, and the composite member is molded. Production method. A valve body that is driven in an opening direction and a closing direction of a fluid passage in a valve body to control movement of a fluid, comprising: a cured elastomer body; and a resin sheet laminated on a side of the cured elastomer body that contacts the fluid. In a method of manufacturing a valve body comprising a composite member provided,
At least one surface of the resin sheet is modified by a discharge treatment under a predetermined gas atmosphere, and an unvulcanized elastomer composition containing a bonding reinforcing agent and a vulcanizing agent is in contact with the modified surface of the resin sheet. A method for manufacturing a valve body, wherein the resin sheet and the cured elastomer are joined and integrated by heating and pressing, and the composite member is molded.

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