KR102153251B1 - Method for manufacturing diaphragm - Google Patents

Abstract

The present invention relates to a method for manufacturing a diaphragm which shows improved binding force between a core material layer and an outer shell layer, can be used stably for a long time, and can save the costs required for maintenance and repairing. The method for manufacturing a diaphragm includes the steps of: (a) molding an elastomer to form a first outer shell molded product; (b) supplying a fabric substrate coated with copper (Cu) and a vulcanized coating agent to one surface of the first outer shell molded product to obtain a laminate including the first outer shell molded product and the fabric substrate; (c) molding an elastomer to form a second outer shell molded product; (d) supplying the second outer shell molded product to the top surface of the fabric substrate of the laminate, and carrying out heating and pressurization to obtain a diaphragm having a structure including an outer shell layer and a core material layer fixed and formed in the outer shell layer.

Description

Method for manufacturing diaphragm {Method for manufacturing diaphragm}

The present invention relates to a method of manufacturing a diaphragm capable of reducing maintenance and repair costs by being able to stably use for a long time due to excellent bonding between a core layer and an outer layer.

In addition, in the present invention, a first skin molded product and a second skin molded product forming an outer skin are each manufactured, and the fabric fabric is fixed and then integrated between the first skin molded product and the second skin molded product to form a core material layer. The present invention relates to a method of manufacturing a diaphragm that is positioned at the center of the first outer layer and the second outer layer to accurately control the flow of fluid flowing in both directions.

A diaphragm is a variable plate-shaped structure and is installed in various industrial equipment to apply pressure to a fluid, to open or close a fluid, or to measure pressure using a displacement of a curve. It is a part used in gas pressure regulators and control machines to operate without contacting working fluids such as gas or liquid.

The diaphragm is manufactured by molding it into a thin film using natural rubber, synthetic rubber, or metal plate so that it can exhibit flexible and shock-absorbing properties.However, if the diaphragm is manufactured using only natural or synthetic rubber, the durability of the diaphragm decreases for a long time. There is a problem that it is difficult to use, and recently, in order to improve the durability, the outer shell is formed using materials such as natural rubber and synthetic rubber, and a core material such as a reinforcing fabric is introduced inside to make the fabric used as a reinforcing fabric. Manufactured using fibers of various materials such as silver cotton, nylon, polyester, aramid (m-Aramid, p-Aramid), polyketone, glass fiber, carbon fiber, aramid (m-Aramid, p-Aramid), polyketone, etc. One is being used, and various studies related to this have been conducted.

For example, Japanese Unexamined Patent Application Publication No. 2009-167575 of Document 1 is composed of a multifilament yarn bulky processed yarn of fibers composed of polyketone, the bulky processed yarn is a fluid spray processed yarn, and a loop mow protrudes on the surface of the bulky processed yarn. A structure reinforced with a reinforcing fiber cord by applying an adhesive to one or both sides of a reinforcing fabric consisting of a diaphragm reinforcing fiber cord, characterized in that the diaphragm is formed, and a rubber layer located on both sides of the reinforcing fabric by a vulcanization method. The contents of the diaphragm having a have been disclosed.

However, the diaphragm manufactured by the above method was intended to increase the bonding strength between the reinforcing fiber cord and the rubber layer by using a reinforcing fiber cord manufactured using a processed yarn with a loop mower protruding on the surface. Not only does it not increase the bonding strength between the rubber layer and the reinforcing cloth significantly by increasing the surface area alone, but also when trying to improve the bonding strength between the rubber layers through vulcanization, the bonding strength between the rubber layers decreases as the reinforcing cloth is located between the rubber layers on both sides, greatly increasing the durability of the diaphragm. There is a problem that it does not improve, so research on ways to compensate for this is needed.

Japanese Unexamined Patent Publication No. 2009-167575 (Publication date: 2009.07.30) Japanese Unexamined Patent Publication No. 2011-226626 (Publication date: 2011.11.10)

The present invention was conceived to solve the problems of the prior art as described above, and relates to a method of manufacturing a diaphragm that can be used stably for a long time by improving the bonding force between the core layer and the outer skin layer, thereby reducing maintenance and repair costs. It is intended to provide technical content.

In addition, in the present invention, a first skin molded product and a second skin molded product forming an outer skin are each manufactured, and the fabric fabric is fixed and then integrated between the first skin molded product and the second skin molded product to form a core material layer. An object of the present invention is to provide technical details on a method of manufacturing a diaphragm that can accurately control the flow of fluid flowing in both directions by being located at the center of the first and second outer layers.

The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. Can be.

In order to achieve the above-described technical problem, the present invention includes the steps of: (a) supplying an elastomer to a first mold and molding the supplied elastomer to prepare a first shell molded article; (b) supplying a fabric fabric coated with copper (Cu) and a vulcanization coating agent on one side of the first shell molding to prepare a laminate including the first shell molding and the fabric fabric; (c) supplying an elastomer to a second mold and molding the supplied elastomer to prepare a second shell molded article; And (d) supplying a second shell molding to the upper surface of the fabric fabric of the laminate, heating and pressing to produce a diaphragm having a structure including an outer skin layer and a core layer fixedly formed inside the outer skin layer. It provides a method of manufacturing a diaphragm.

In addition, the fabric fabric has a thickness of 0.01 to 0.2 mm, using an aramid composite fiber formed by twisting a core yarn containing polyurethane fibers and a covering yarn containing aramid fibers on the outer circumferential surface of the polyurethane fibers. You can use what you have prepared.

In addition, the copper (Cu) and the fabric fabric coated with a vulcanization coating agent, (1) pre-treatment by immersing the fabric fabric in an acidic solution; (2) immersing the pretreated fabric fabric in a copper coating solution, heating it to a temperature of 50 to 100°C, and reacting for 30 to 600 minutes to prepare a fabric fabric coated with copper; And (3) coating a vulcanized coating agent on the copper-coated fabric fabric.

In addition, the step (a) may further include the step of irradiating a thermal plasma jet to the first shell molding after manufacturing the first shell molding.

In addition, the step (c) may further include the step of irradiating a thermal plasma jet to the second shell molding after manufacturing the second shell molding.

The method of manufacturing a diaphragm according to the present invention uses a copper-coated fabric fabric to improve the bonding strength between the core layer and the outer layer, so that even when repeatedly used, separation between the core layer and the outer layer does not occur, and the core layer By stably reinforcing this outer layer, a diaphragm can be manufactured that can be used for a long time, thereby reducing maintenance and repair costs.

In addition, in the method of manufacturing a diaphragm according to the present invention, a first shell molding and a second shell molding to form an outer shell are manufactured, respectively, and a fabric fabric is fixed between the first shell molding and the second shell molding, and then integrated. The fabric fabric forming the layer is positioned at the center of the first and second outer layers, so that the flow of fluid flowing in both directions can be accurately controlled, and a diaphragm capable of effectively preventing deformation of the elastomer can be manufactured.

1 is a process chart showing a method of manufacturing a diaphragm according to the present invention.
2 is a perspective view showing an example of a circular diaphragm manufactured by the method of manufacturing a diaphragm according to the present invention.
3 is an actual image photographing each process of manufacturing a diaphragm by a method according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments can be modified in various ways and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only those effects, the scope of the present invention should not be understood as being limited thereto.

The meaning of the terms described in the present invention should be understood as follows.

Terms such as "first" and "second" are used to distinguish one component from other components, and the scope of rights is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. On the other hand, when it is mentioned that a component is "directly connected" to another component, it should be understood that there is no other component in the middle. On the other hand, other expressions describing the relationship between the constituent elements, that is, "between" and "just between" or "neighboring to" and "directly neighboring to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" refer to specified features, numbers, steps, actions, components, parts, or It is to be understood that it is intended to designate that a combination exists and does not preclude the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in a commonly used dictionary should be interpreted as having the meaning of the related technology in context, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

Hereinafter, the present invention will be described in detail.

In the method of manufacturing a diaphragm according to the present invention, a first shell molded product and a second shell molded product that form an outer skin layer using an elastomer are prepared, respectively, and a fabric fabric for reinforcement is fixed between the first and second shell moldings. By integrating, it is possible to manufacture a diaphragm capable of accurately controlling the flow of fluid flowing in both directions by placing the fabric fabric forming the core layer at the center of the outer skin layer.

1 is a process chart showing a method of manufacturing a diaphragm according to the present invention.

Referring to FIG. 1, the method of manufacturing a diaphragm according to the present invention includes the steps of: (a) supplying an elastic polymer to a first mold and molding the supplied elastic polymer to produce a first shell molded product (S100); (b) supplying a fabric fabric coated with copper (Cu) and a vulcanization coating agent on one side of the first shell molding to prepare a laminate including the first shell molding and the fabric fabric (S200); (c) supplying an elastomer to a second mold and molding the supplied elastomer to prepare a second shell molded article (S300); And (d) supplying a second skin molding to the upper surface of the fabric fabric of the laminate, heating and pressing to produce a diaphragm having a structure including an outer skin layer and a core layer fixedly formed inside the outer skin layer (S400); including; do.

Explaining the method of manufacturing the diaphragm according to the present invention in detail, the step (a) is a step (S100) of manufacturing a first shell molded article, wherein an elastomer is supplied to the first mold and the supplied elastomer is molded. A first skin molded article can be prepared.

In this step, a first shell molded article may be manufactured using a conventional various types of molding apparatus capable of producing a molded article by pressing and heating an elastomer using a method such as press molding or injection molding.

Specifically, the molding apparatus includes a first mold having a shape of a diaphragm, a press-pressing means formed on the upper surface of the first mold to heat and press the elastomer to form the first shell molded product, at 150 to 300°C. A press molding apparatus having a structure equipped with a heating means capable of heating the elastomer to a temperature can be used, and the elastomer sheet is heated while pressing the elastomer sheet processed into a sheet shape with a press to form the elastomer sheet in the cavity of the first mold. By filling, the elastomer sheet can be press-molded into the shape of the first mold.

In addition, the molding device may be used having a structure additionally provided with a suction means for inhaling gas on the inner surface of the first mold, and when the elastomer supplied to the first mold is molded, between the first mold and the elastomer By discharging the gas remaining in the air to the outside and inducing it to become a vacuum or a vacuum-like state, air bubbles are prevented from being formed in the first shell molding, and uniformity of the thickness can be ensured.

In this step, a rubber-based elastomer may be used as a material in order to manufacture the first shell molding.

Elastomers include natural rubber (NR), polyurethane rubber (PU), polychloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), hydrogenated NBR rubber (HNBR), styrene-butadiene rubber (SBR), and alkylation. Chlorosulfonate polyethylene rubber (ACSM), epichlorohydrin rubber (ECO), polybutadiene rubber (BR), ethylene propylene copolymer rubber (EPM), ethylene propylene diene terpolymer rubber (EPDM), neoprene rubber (neoprene) , Ethylene octene copolymer rubber (EOM), ethylene butene copolymer rubber (EBM), ethylene octene terpolymer rubber (EODM), ethylene butene terpolymer rubber (EBDM), ethylene vinyl acetate elastomer rubber (EVM), ethylene methyl acrylate Rubber (EAM), chlorinated polyethylene rubber (CPE), fluorosilicone (FVQM), fluorocarbon rubber (FKM), polyacrylate (ACM), silicone rubber (silicone, VQM), What is prepared using chloroprene rubber or a mixture thereof may be used.

In particular, the elastomer can be used at a high temperature of 300 to 350°C, so FVQM rubber with excellent heat resistance, NBR rubber with excellent tensile strength, EPDM rubber with excellent chemical resistance, ozone resistance, weather resistance, heat aging resistance, and cold resistance (low temperature characteristics), It is possible to use a CR rubber having excellent adhesion, oil resistance and flame retardancy, a silicone rubber having both heat resistance to withstand high temperatures of 300°C and cold resistance to withstand low temperatures of -95°C.

In addition, the elastomer may each contain additives such as fillers, plasticizers, stabilizers, coagents, hardeners, lubricants and accelerators.

Further, as the elastomer, a melt of a mixture in an uncured state may be used, but preferably, an elastomer sheet manufactured by processing into a sheet shape may be introduced.

In addition, in this step, it can be configured to further include the step of irradiating thermal plasma on the surface of the manufactured first shell molding, and irradiating thermal plasma to the surface of the first shell molding to be unvulcanized or in a state before vulcanization. It may be configured to prevent oxidation occurring on the surface of the first skin molded article and to improve adhesion.

When thermal plasma is irradiated on the surface of the first skin molding, the thermal plasma heats the first skin molding in a short time to remove air remaining on the surface and internal tissue of the first skin molding to prevent oxidation and at the same time, the density of the tissue. Can increase.

Thermal plasma can be irradiated to the skin molding using a heat-assisted plasma gun that generates a thermal plasma jet, and the thermal plasma gun is a plasma torch that supplies a heat source to vaporize the plasma generated gas. ; A DC power supply provided on one side of the plasma torch to supply power; A reaction chamber provided below the plasma torch and providing a space for generating a thermal plasma jet; Having a structure including a gas supply device provided on one side of the plasma torch to supply plasma generation gas for generating a thermal plasma jet to the plasma torch, and a nozzle provided on one side of the reaction chamber to discharge the thermal plasma jet generation gas to the outside. Can be used.

The plasma torch generates a direct current arc discharge between the cathode and anode nozzles, including the cathode and anode nozzles, and when plasma generating gas is supplied between the anode and the cathode, the gas is heated by the arc and heated to a high temperature. Accordingly, a thermal plasma jet stream can be generated in the anode nozzle. In particular, the thermal plasma jet supplied from the thermal plasma supply device refers to an ionizing gas composed of electrons, ions, atoms and molecules generated in the torch by using a direct current arc or high-frequency inductively coupled discharge. It is a high-speed jet.

As the plasma generating gas, nitrogen gas, argon gas, or a mixed gas of argon (Ar) and nitrogen (N ₂ ) can be used, and the plasma generating gas is easy to emit electrons even with relatively little energy using an inert gas. There is an advantage in that it does not react with gas and does not generate by-products.

In particular, diatomic molecules such as nitrogen (N ₂ ) can be heat-treated in a short time on the unvulcanized first skin molded article in the recombination process by dissociation, recombination, and desorption processes.

Preferably, the plasma generating gas as described above may be a mixed gas containing argon (Ar) and nitrogen (N ₂ ) in a volume ratio of 1: 10 to 1: 2 (Ar: N ₂ ), preferably As for the plasma generation gas, a mixed gas containing argon and nitrogen may be supplied in a volume ratio of 1:3 (Ar: N ₂ ), thereby treating each of the skin moldings.

In addition, in this step, the surface treatment of the unvulcanized rubber sheet can be performed by adjusting the output of the thermal plasma jet, and the thermal plasma jet with an output of 100 to 1,500 W is irradiated for 1 to 120 seconds to Ryu rubber sheet can be surface treated. If the output of the thermal plasma jet is less than 100 W or the irradiation time is less than 1 second, there may be a problem that the surface treatment is insignificant and the antioxidant effect is reduced. The output of the thermal plasma jet exceeds 1,500 W or the irradiation time is 120 If it exceeds seconds, there may be a problem that the structure of the first shell molding is melted.

More preferably, in this step, the first shell molding may be surface-treated by irradiating a thermal plasma jet having an output of 500 to 800 W on the surface of the sheet-like elastomer in an unvulcanized state for 5 to 30 seconds.

On the other hand, the step (b) is a step (S200) of manufacturing a laminate, by arranging a fabric fabric on one side of the first skin molded product to prepare a laminate including the first skin molded product and the fabric fabric, In particular, it is possible to manufacture a laminate by pressing and fixing the fabric fabric to the first shell molding using a pressing means.

The woven fabric is natural fiber including cotton, wool, rayon fiber, nylon fiber, cellulose fiber, polyester fiber, polyamide fiber, aramid fiber, polyvinyl alcohol fiber, polypropylene fiber, polyethylene fiber, vinylidene fiber, It is possible to use a fiber made of various materials such as cupra fiber, polyfluoroethylene fiber, poly(p-phenylenebenzobisoxazole) fiber, polyolefin fiber, carbon fiber, ceramic fiber, glass fiber, metal fiber, etc. It is not limited thereto, and the fibers of the woven fabric may be a combination of two or more fibers, a blended yarn, a blended yarn, a covering yarn, or a single yarn, a multifilament yarn, or the like may be used. In addition, the woven fabric may be a woven fabric fabric or a knitted fabric fabric, a felt fabric, a non-woven fabric fabric, etc., prepared by using the above fibers in a manner such as plain weave, twill weave, and juja weave, and the like, double weave, etc. It is also possible to use a thick woven fabric manufactured in the same way.

In addition, the fabric fabric may be a heat-treated reinforced fabric fabric, and the reinforced fabric fabric is supplied to a steam chamber provided with a pressure roller and irradiated with steam, and the fabric is heated at a temperature of 160 to 170 °C. It can be manufactured by moving the fabric at a speed of 2 to 10 m/min while pressing at 1 to 10 MPa pressure, and such reinforced fabric fabrics do not shrink or relax easily, so there is no deformation and the original shape is maintained. Will have.

Alternatively, the reinforced fabric fabric is preformed into a diaphragm shape by supplying it to a mold and then pressing at 1 to 10 MPa pressure using a pressing means, heating at a temperature of 150 to 200 ℃ and heat treatment for 1 to 10 minutes. You can also use

Preferably, the woven fabric may be a woven fabric prepared using an aramid composite fiber, and the aramid composite fiber may be used by twisting a covering yarn containing polyurethane fibers to a core yarn containing aramid fibers. , Such aramid composite fibers show complex physical properties by combining aramid fibers, a high strength and high heat resistance fiber material, with polyurethane fibers that give excellent elasticity, and have excellent twist stability and sufficiently express elasticity to provide excellent elasticity and The shape stability and rigidity of the covering yarn covered by the yarn is excellent, so it can prevent the deformation of the fabric fabric, and the stability of the fabric fabric is excellent even when heated at high temperatures.

Specifically, as the aramid composite fiber, aramid composite fiber having a single covering structure manufactured by covering the aramid covering yarn in a single direction in the Z direction or S direction around the polyurethane core yarn may be used, or around the core yarn It is also possible to use an aramid composite fiber having a double covering structure in which two covering yarns are twisted in both directions in the Z direction and the S direction to double cover.

The aramid composite fiber may be prepared through a variety of conventional fiber manufacturing methods in which the covering yarn is twisted on the core yarn, and each fiber is supplied through a canonical beam, and a hollow spindle and 1,000 to 50,000 It can be manufactured by twisting aramid fibers on the outer circumferential surface of the core yarn including polyurethane fibers by using a spool for winding fiber that rotates at high speed at a speed of rpm.

Preferably, the aramid composite fiber should have a density or number of twists, that is, a covering density of 200 to 1000 twists (TM), at which the aramid fiber is covered in 1 m of the polyurethane fiber, but when TM is less than 200 Processability becomes poor and the aramid fiber does not sufficiently cover the polyurethane fiber, resulting in streakiness in the aramid composite fiber, making it difficult to develop tensile strength.If TM exceeds 1000, the aramid fiber is excessive due to the high number of twists. By twisting, double twisting occurs, forming fibers with uneven physical properties.

The aramid composite fiber produced by the above method shows composite physical properties by combining aramid fiber, a high strength, high heat resistance fiber material, with polyurethane fiber that gives excellent elasticity, and has excellent twist stability and sufficiently expresses elasticity, so it has elasticity. Not only is it excellent, but also the shape stability and rigidity of the covering yarn covered in the core yarn are excellent, so that deformation of the aramid fabric fabric can be prevented, and the stability of the aramid fabric fabric is excellent even when heated at high temperatures.

More specifically, the polyurethane fiber used as the core yarn in the aramid composite fiber exhibits excellent properties with high elongation and an elastic recovery rate of 100%.

Preferably, the polyurethane fiber may have an elongation of 150 to 300%, and a fineness (filament size) or a thickness of 500 to 1000 denier (D) may be used. When the fineness of the polyurethane fiber is less than 500 denier, a problem of insufficient strength expression may occur, and when the fineness exceeds 1000 denier, twisting processability may deteriorate and elasticity may decrease. More preferably, the polyurethane fiber may have an elongation of 200% and a fineness of 560 denier.

The aramid fiber used as a covering yarn for the aramid composite fiber is a generic term for aromatic polyamide fiber, and contains a long chain synthetic polyamide as a constituent component, and has an amide bond of at least 85%. It is an artificial fiber that is directly attached to two aromatic rings, and can be largely classified into para-liked aramid fibers and meta-liked aramid fibers according to the bonding position of the amide group and the benzene ring.

Specifically, the para-aramid fiber exhibits excellent stiffness properties, including polyparaphenylene terephthalamide, and the like, and the meta-aramid is poly(meta-phenylene isophthalamide) [poly(m- phenyleneisophthalamide), PMIA], etc., and has excellent thermal stability.

Accordingly, the aramid fiber is preferably used by mixing a meta-aramid fiber having a small elastic modulus and a para-aramid fiber having a large elastic modulus to adjust the physical properties, and the mixed aramid fiber as described above has repeated stress or pressure cycles. It is possible to manufacture an aramid composite fiber having excellent physical properties by preventing the fiber from being worn during the manufacturing process or the impact applied during the manufacturing process.

Preferably, the aramid fiber may be a mixed-type aramid fiber prepared by fusing the meta-type aramid fiber in a weight ratio of 10 to 40 parts by weight and a para-type aramid fiber in a weight ratio of 60 to 90 parts by weight, the aramid fiber has a fineness What is 200 to 1500 denier can be used. When the fineness of the aramid fiber is less than 100 denier, a problem of insufficient strength may occur, and when it exceeds 1500 denier, the stiffness of the fiber is too high and it is difficult to cover.

In particular, the aramid fiber can be used as a para-aramid fiber by obtaining a commercially available ALKEX fiber, and can be used as a meta-aramid fiber by obtaining a commercially available NOMEX fiber, and the para-aramid fiber and meta-aramid fiber are specified. It is also possible to use aramid plying yarns combined in a ratio.

More preferably, the aramid fiber may be an aramid plying fiber prepared by plying at a ratio of 25 parts by weight of meta-aramid fiber and 75 parts by weight of para-aramid fiber.

Therefore, the aramid composite fiber manufactured by covering with a core yarn containing polyurethane fibers and a covering yarn containing aramid fibers formed by twisting the outer peripheral surface of the core yarn as described above has excellent elasticity and stretching of the polyurethane fibers as the core yarn. Aramid composite fibers having complex physical properties can be prepared by providing recovery and allowing the aramid fibers, which are covering yarns, to exhibit properties of tensile strength, toughness, heat resistance, high strength, and high elasticity, and manufactured using such aramid composite fibers. One aramid fabric can play a role in significantly improving the properties of the diaphragm structure compared to the polyester fiber used previously.

And, as the fabric fabric, a knitted fabric woven from aramid composite fibers is used, or aramid composite fibers are used as warp and weft yarns, respectively, and the warp and weft yarns are crossed to each other. It is also possible to use woven fabric.

In addition, in the method of manufacturing a diaphragm according to the present invention, a fabric fabric coated with a copper and a vulcanization coating agent may be used so that a diaphragm having excellent durability can be manufactured by increasing the bonding strength between the fabric fabric and the elastic polymer.

Specifically, a fabric fabric coated with copper and a vulcanization coating agent has a structure in which a copper component is fixed on the surface of a fiber forming a fabric fabric structure, and a fabric fabric having such a structure has a sulfur component in which copper is contained in the vulcanizing agent. It can be combined with the fabric to form copper sulfide that connects the fabric of the fabric with the elastomer, and the elastomer is strongly bonded by vulcanization or vulcanization.In this vulcanization process, copper sulfide is formed between the outer skin layer and the core material layer. It is possible to greatly improve the bonding strength between the skin and the skin molding, and copper promotes vulcanization by increasing the thermal conductivity during the vulcanization time of bonding the first skin molding and the second skin molding together with the fabric fabric in step (d) to be described later. I can make it.

In addition, the vulcanized coating agent coated on the fabric fabric can not only bond the fabric fabric with the first and second skin moldings containing an elastomer, but also vulcanize the first and second skin moldings to bond them. And, as the tackifier contained in the vulcanization coating agent reacts with the copper salt coated on the fabric fabric and the sulfur of the vulcanizing agent during the process of co-curing with the first and second shell moldings to produce copper sulfide, the bonding strength between the outer skin layer and the fabric fabric The diaphragm can be greatly improved.

Fabric fabric coated with the copper and vulcanization coating agent as described above, (1) pre-treatment by immersing the fabric fabric in an acidic solution; (2) immersing the pretreated fabric fabric in a copper coating solution heated to a temperature of 50 to 100 ℃ and reacting for 30 to 600 minutes to prepare a fabric fabric coated with copper; And (3) coating the vulcanized coating agent on the copper-coated fabric fabric.

Specifically, the fabric fabric can activate the surface of the fibers constituting the fabric fabric through a pretreatment process in which the fabric fabric is immersed in an acidic solution, and a structure in which copper is easily bonded to the fabric fabric can be formed. To this end, in the pretreatment step of step (1), the fabric fabric may be immersed in an acidic solution heated to a temperature of 30 to 100° C. and reacted for 1 to 20 minutes to pretreat. The pretreated fabric fabric can be configured to remove acidic components by washing it at least once with water.

Acidic solution is an aqueous solution in which hydrochloric acid (HCl), sulfuric acid (H ₂ SO ₄ ), nitric acid (HNO ₃ ), hydrofluoric acid (HF), boric acid (H ₃ BO ₃ ), acetic acid (CH ₃ COOH) or a mixture thereof are dissolved in water May be used, and an acidic solution having a pH of 2 to 5 may be used.

In addition, in the step (2), the pretreated fabric fabric is immersed in a copper coating solution to prepare a copper-coated fabric fabric. For this purpose, the pretreated fabric fabric is immersed in a copper coating liquid heated at a temperature of 50 to 100°C. , By reacting for 30 to 600 minutes to prepare a copper-coated fabric fabric.

The copper coating solution can be a mixture containing a copper salt, an amine compound, an alkali compound and a solvent, and the copper salt is copper nitrate, copper chloride, copper sulfate, copper acetate, and copper citrate that generate divalent copper ions (Cu ²⁺ ). , Copper ammonium complex salts or mixtures thereof may be used, and such copper salts remain fixed to the fiber surface of the fabric fabric, and sulfur (S) of the vulcanizing agent and It combines together to form copper sulfide, and plays a role of greatly improving the bonding strength between the first and second shell moldings and the fabric fabric.

In the copper coating solution, the copper salt may be mixed in a proportion of 20 to 50 parts by weight, and if the content of the copper salt is less than 20 parts by weight, the amount of copper introduced into the fabric is small, so it is difficult to expect the improvement of the adhesion between the outer layer and the core layer. If it exceeds parts by weight, there may be a problem that the mechanical properties of the fabric fabric are deteriorated.

The amine-based compound forms a complex with divalent copper ions, thereby reducing the generation of copper oxides or metal copper deposits formed as by-products on the fiber surface, and uniformly bonding the copper salt to the fibers of the textile fabric. Amine compounds include monoalkanolamine, dialkanolamine, trialkanolamine, ethylenetriamine, m-hexylamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, heptamethylenediamine, ethylenediamine, diethyltriamine , Triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, dimethylamine, triethanolamine, hydroxylamine sulfate, EDTA salt, or a mixture thereof may be used.

In the copper coating solution, the amine compound may be mixed in a proportion of 3 to 20 parts by weight, and when the content of the amine compound is less than 3 parts by weight, the copper ions contained in the copper salt are oxidized, resulting in an excessive amount of copper oxide, thereby improving adhesion. It is difficult to expect, and if it exceeds 20 parts by weight, it is difficult to expect additional physical property improvement.

The alkali compound softens the fiber structure of the fabric fabric so that the copper salt is easily bonded to the fiber structure, and sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, or a mixture thereof may be used.

In the copper coating solution, the alkali compound may be mixed in a ratio of 1 to 10 parts by weight, and when the content of the alkali compound is less than 1 part by weight, the bonding between the copper salt and the fabric fabric is lowered, making it difficult to expect an improvement in the adhesion between the outer layer and the core layer, If it exceeds 10 parts by weight, there may be a problem that the mechanical properties of the fabric fabric are deteriorated.

The solvent serves to uniformly mix a copper salt, an amine compound, and an alkali compound, and may be mixed in a ratio of 30 to 50 parts by weight.

In addition, the copper coating liquid may be configured to further include a pH adjusting agent, and the pH may be adjusted according to the fiber material of the fabric fabric.

When the copper coating solution as described above is used, the pretreated fabric fabric is immersed in the copper coating liquid heated at a temperature of 30 to 100 °C, and reacted for 30 to 600 minutes to effectively bind the copper salt to the fiber structure of the fabric fabric. Fabrics coated with copper can be manufactured.

In addition, when the copper-coated fabric fabric as described above is used, the bonding strength is improved, so that the amount of tackifier applied to adhere the fabric fabric between the first and second shell moldings can be reduced, and within the diaphragm structure It is possible to prevent a decrease in the flexibility of the diaphragm caused by curing of the heterogeneous tackifier.

In the step (3), a vulcanization coating agent is coated on the copper-coated textile fabric as described above to prepare a textile fabric coated with copper and a vulcanization coating agent, and the vulcanization coating agent is a tackifier, a vulcanization agent, a vulcanization accelerator, and a silane. Mixtures comprising a coupling agent and a solvent can be used.

In the vulcanized coating agent, the tackifier not only causes each component of the vulcanized coating agent to adhere to the surface of the fabric fabric, but also improves the bonding between the outer molded material and the fabric fabric bonded to both sides of the fabric fabric.

Tackifiers may include phenolic resins, acrylonitrile butadiene rubbers, fluororubbers, or mixtures thereof, and such tackifiers exhibit flexibility even after curing, resulting in skin moldings and fabric fabrics made of various elastomer materials. Can be combined.

In the vulcanized coating agent, the tackifier may be mixed in a ratio of 30 to 60 parts by weight, and if the content of the tackifier is less than 30 parts by weight, the bonding performance may be deteriorated, and if it exceeds 60 parts by weight, the thickness of the fabric fabric fibers It may be difficult to form a thick and uniform coating layer.

In the vulcanization coating agent, the vulcanizing agent acts as a sulfur donor, and can form a diaphragm with excellent durability by accelerating the vulcanization of skin moldings and textile fibers. Vulcanizing agents include inorganic vulcanizing agents such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), and colloid sulfur, and tetramethylthiuram disulfide (TMTD), tetraethyltriuramdisulfide (TETD), dithiodimorpholine. ), etc., can be used.

In the vulcanization coating agent, the vulcanizing agent may be mixed in a ratio of 3 to 20 parts by weight, and if the content of the vulcanizing agent is less than 3 parts by weight, a problem of insufficient vulcanization may occur, and if it exceeds 20 parts by weight, the vulcanization reaction rate is increased. It is difficult to adjust, which may cause a problem of deteriorating the durability of the diaphragm.

In the vulcanization coating agent, the vulcanization accelerator serves to accelerate the vulcanization, shortens the vulcanization time by increasing the vulcanization rate, lowers the vulcanization temperature, reduces the amount of vulcanization agent used, and improves diaphragm properties.

The vulcanization accelerator may be organic, inorganic, or a mixture thereof, and such a vulcanization accelerator may be a thiuram type such as tetramethylthiuram disulfide, an aldehyde ammonia type such as hexamethylenetetramine, acetaldehyde ammonia, or acetaldehyde aniline. Such as aldehyde amines, guanidines such as diphenyl guanidine, thioureas such as dibutyl thiourea, thiazoles such as 2-mercapto benzothiazole, dithiocarbamic acid such as sodium dimethyldithiocarbamate, Representative examples include xanthate-based, sulfenamide-based, zinc oxide, and magnesium oxide, and the type of vulcanization accelerator can be changed according to the type of elastomer.

In the vulcanization coating agent, the vulcanization accelerator may be mixed in a ratio of 0.5 to 10 parts by weight, and if the content of the vulcanization accelerator is less than 0.5 parts by weight, the vulcanization time is prolonged and the vulcanization temperature increases, and if it exceeds 10 parts by weight It is difficult to control the vulcanization reaction rate, which may cause a problem that the durability of the diaphragm is deteriorated.

In the vulcanization coating agent, the silane coupling agent serves to strengthen the bonding performance between the fabric fabric and the outer skin molded body by imparting a functional group, and makes the copper sulfide generated by vulcanization strongly fixed to the fabric fabric, and 3-mercaptopropyltrimethoxy A silane coupling agent having a thiol group such as silane, an azole group such as imidazole, a cyano group such as vinyltrimethoxysilane, a thiocarbonyl group, a thiourea group, an amino group, and an amide group may be used.

In the vulcanized coating agent, the silane coupling agent can be mixed in a ratio of 1 to 5 parts by weight.If the content of the silane coupling agent is less than 1 part by weight, the effect of enhancing the bonding performance is insignificant, and if it exceeds 5 parts by weight, the effect of further improving physical properties is expected. It's hard to do.

In the vulcanized coating agent, the solvent plays a role of dissolving each component uniformly, and an organic solvent having excellent dissolving power such as toluene, xylene, acetone, and NMP is introduced and used, and the solvent in the vulcanized coating agent is 30 to 70 parts by weight. Can be mixed with.

The vulcanization coating agent as described above enhances the bonding force by promoting vulcanization between the first and second outer shell moldings made of elastomers, and the sulfur contained in the vulcanizing agent reacts with the copper salt bonded to the fabric fabric, so that the bonding strength between the outer layer and the core layer By forming copper sulfide that can improve the inside of the diaphragm tissue, it is possible to manufacture a diaphragm with excellent durability.

The step (c) is a step (S300) of manufacturing a second shell molded article, wherein an elastomer is supplied to the second mold, and the supplied elastomer is molded to manufacture a second shell molded article.

In this step, by supplying an elastomer to the second mold using the same method as in step (a), a second shell molded product having a structure that can be introduced and integrated into the inner surface of the first shell molded product can be manufactured, and the elastomer May be used, but is not limited thereto, and a second skin molded product may be manufactured using a heterogeneous elastomer different from the first skin molded product so as to exhibit complex physical properties. have.

In addition, in this step, it may be configured to further include the step of irradiating thermal plasma on the surface of the manufactured second shell molding, and irradiation of thermal plasma may be performed in the same manner as the first shell molding.

The step (d) is a step of manufacturing a diaphragm (S400), in which a second skin molded product is supplied to the upper surface of the core layer of the laminate, and heated and pressurized to sequentially form a first skin molded product, a fabric fabric, and a second skin molded product. It can be stacked to manufacture a diaphragm having a structure including an outer skin layer and a core layer.

In this step, a diaphragm can be manufactured through various conventional methods of vulcanizing and bonding rubber, for example, placing a second skin molded product on the upper surface of the fabric fabric of the laminate manufactured using the first mold, and then pressing means The diaphragm can be manufactured by applying heat and pressure to vulcanize for a certain period of time.

Specifically, in this step, heating and pressing at a temperature of 100 to 300 °C using a hot press, and applying heat for 5 to 180 minutes, the vulcanization coating agent is co-cured during the vulcanization of the rubber to the fabric fabric structure. As copper sulfide is formed to induce a strong bond with the elastomer, the bonding force between the outer layer and the core layer can be greatly improved, and thereby, a diaphragm having excellent durability can be manufactured.

In addition, in the present invention, when the diaphragm is manufactured using the first and second shell moldings as described above, the elastomer is formed as a double layer, so that it is possible to reduce the risk of rupture and leakage due to pressure and temperature. In addition, even if it is ruptured under pressure, a process error can be prevented by the other layer, and the service life can be extended compared to a single structure.

2 is a perspective view showing an example of a circular diaphragm manufactured by the method of manufacturing a diaphragm according to the present invention.

Referring to FIG. 2, the diaphragm 10 manufactured by the method of manufacturing a diaphragm according to the present invention includes a core material layer 100 including a fabric fabric; And a first skin molded product formed by using an elastomer and formed by lamination on the outer peripheral surface of the core material layer 100 and an outer skin layer 200 formed of a second skin molded product, wherein a protrusion is formed in the center and has a disk shape. As a plate-shaped structure, it is installed in various industrial devices and can be used to apply pressure to a fluid, to measure pressure using a displacement of a curve, or to open and close a fluid. In particular, as shown in FIG. 2, in the method of manufacturing a diaphragm according to the present invention, a circular diaphragm having a protrusion formed in the center has been described as an example, but it can also be used as a method for manufacturing a polygonal diaphragm such as a square, and is limited thereto. It is not received.

Preferably, in the method of manufacturing a diaphragm according to the present invention, a core material layer is formed using a fabric fabric having a thickness of 0.05 to 0.2 mm, and first and second skin moldings are respectively introduced on both sides of the fabric fabric. Diaphragm structures with a thickness of 0.5 to 200 mm can be manufactured.

The diaphragm as described above allows the fabric fabric forming the core layer to be located in the center of the outer skin layer, so that the flow of fluid flowing in both directions can be accurately controlled, so that it can induce a sensitive effect when introduced into an industrial device for controlling the flow of fluid. It can improve the operating efficiency and reliability of industrial equipment.

Specifically, the diaphragm may play a role of uniformly controlling the supply pressure of an object guided to a supply line such as gas or fluid, and a space inside the device used to detect an abnormal state of gas or fluid. It may also be used for partitioning purposes, and preferably, a diaphragm valve, a differential pressure flow rate control valve, a differential pressure control valve, a water level control valve, a water pressure reducing valve, a water supply pressure reducing valve, etc. may be introduced and used.

As described above, the method of manufacturing a diaphragm according to the present invention improves the bonding strength between the core layer and the outer layer by using a fabric coated with copper, so that separation between the core layer and the outer layer does not occur even when repeatedly used. It is possible to manufacture a diaphragm that can reduce maintenance and repair costs because the core layer reinforces the outer skin layer and can be used stably for a long time.

In addition, in the method of manufacturing a diaphragm according to the present invention, a first shell molding and a second shell molding to form an outer shell are manufactured, respectively, and a fabric fabric is fixed between the first shell molding and the second shell molding, and then integrated. The fabric fabric forming the layer is positioned at the center of the first and second outer layers, so that the flow of fluid flowing in both directions can be accurately controlled, and a diaphragm capable of effectively preventing deformation of the elastomer can be manufactured.

Hereinafter, the present invention will be described in more detail by way of examples.

The examples presented are only specific examples of the present invention, and are not intended to limit the scope of the present invention.

<Production Example 1>

Commercially available 560 denier heat-resistant polyurethane fibers were used as the core yarn, and 200 denier aramid fibers were processed by 500 twists (TM) in a covering machine to prepare aramid composite fibers. The aramid composite fibers were used as warp and weft yarns, respectively, and the warp and weft yarns were crossed to each other to prepare an aramid fabric fabric having a thickness of 0.07 mm.

<Production Example 2>

Commercially available 800 denier heat-resistant polyurethane fiber was constituted as a core yarn, and 700 denier aramid fiber was processed by 400 twists in a covering machine to prepare an aramid composite fiber. The aramid composite fibers were used as warp and weft yarns, respectively, and the warp and weft yarns were crossed to each other to prepare an aramid fabric fabric having a thickness of 0.07 mm.

<Production Example 3>

Commercially available 1,000 denier heat-resistant polyurethane fiber was constituted as a core yarn, and 1,500 denier aramid fiber was processed by 500 twists in a covering machine to prepare an aramid composite fiber. The aramid composite fibers were used as warp and weft yarns, respectively, and the warp and weft yarns were crossed to each other to prepare an aramid fabric fabric having a thickness of 0.07 mm.

<Production Example 4>

Forming a mixture containing 70 parts by weight of styrene-butadiene rubber (SBR), 20 parts by weight of natural rubber (NR), 10 parts by weight of polybutadiene rubber (BR) 30 parts by weight of carbon black, 2 parts by weight of lubricant, and 1 part by weight of slip agent Thus, an elastomer sheet having a thickness of 0.5 mm was prepared.

<Production Example 5>

A mixture containing 100 parts by weight of acrylonitrile butadiene rubber (NBR), 30 parts by weight of carbon black, 2 parts by weight of a lubricant, and 1 part by weight of a slip agent was formed to prepare an elastomer sheet having a thickness of 0.5 mm.

<Production Example 6>

A mixture containing 100 parts by weight of silicone rubber (VQM), 30 parts by weight of carbon black, 2 parts by weight of a lubricant, and 1 part by weight of a slip agent was formed to prepare an elastomer sheet having a thickness of 0.5 mm.

<Production Example 7>

A mixture containing 100 parts by weight of fluorosilicone rubber (FVQM), 30 parts by weight of carbon black, 2 parts by weight of a lubricant, and 1 part by weight of a slip agent was formed to prepare an elastomer sheet having a thickness of 0.5 mm.

<Production Example 8>

A mixture containing 60 parts by weight of ethylene vinyl acetate elastomer rubber (EVM), 40 parts by weight of polyacrylate rubber (ACM), 30 parts by weight of carbon black, 2 parts by weight of lubricant, and 1 part by weight of a slip agent is formed to have a thickness of 0.5 mm. An elastomer sheet was prepared.

<Example 1-1>

3 is an actual image showing a process of manufacturing a diaphragm by a method according to an embodiment.

Referring to FIG. 3, an elastomer sheet was supplied to the first mold, heated and pressed to prepare a first shell molded product, and an elastomer sheet was supplied to the second mold, heated and pressed to produce a second shell molded product. In addition, the first shell molding and the second shell molding were prepared by molding an elastomer sheet having the composition of Preparation Example 4.

A fabric fabric coated with copper (Cu) and a vulcanization coating agent was placed on the upper surface of the first shell molding, and a laminate was prepared by pressing, and a second shell molding was placed on the upper surface of the fabric fabric of the laminate, followed by heating and pressing. The diaphragm was prepared. At this time, the fabric fabric was prepared by the method according to Preparation Example 1.

The fabric fabric coated with copper (Cu) and vulcanization coating agent was pretreated by immersing the fabric fabric in a hydrochloric acid solution of pH 3 and then heating it to a temperature of 55 ℃ and reacting for 2 minutes, and the pretreated fabric fabric was treated three times with distilled water. After repeated washing, the washed fabric fabric was immersed in a copper coating solution, heated to a temperature of 80° C., and reacted for 60 minutes to prepare a fabric fabric coated with copper. As the copper coating liquid, a mixture containing 40 parts by weight of copper nitrate, 5 parts by weight of dimethylamine, 2 parts by weight of potassium carbonate, and 53 parts by weight of distilled water was used.

A vulcanization coating agent was applied on both sides of a copper-coated textile fabric to prepare a textile fabric coated with copper (Cu) and a vulcanization coating agent having a thickness of 300 µm, and the vulcanization coating agent included phenol resin, acrylonitrile butadiene rubber, and fluorine rubber. 40 parts by weight of an adhesion-imparting agent mixture each containing in a weight ratio of 3:2:2, powdered sulfur (S) 10 parts by weight, tetramethylthiuram disulfide 3 parts by weight, 3-mercaptopropyltrimethoxysilane and vinyltri A mixture including 2 parts by weight of a silane coupling agent mixture containing methoxysilane in a weight ratio of 1:1 and 45 parts by weight of acetone was used.

<Example 1-2>

A diaphragm was manufactured using the same method as in Example 1-1, except that the woven fabric prepared by the method according to Preparation Example 2 was used.

<Example 1-3>

A diaphragm was manufactured using the same method as in Example 1-1, except that the woven fabric prepared by the method according to Preparation Example 3 was used.

<Example 2>

A diaphragm was manufactured in the same manner as in Example 1-3, except that the first shell molding and the second shell molding were manufactured using the elastomer sheet having the composition of Preparation Example 5.

<Example 3>

A diaphragm was manufactured in the same manner as in Example 1-3, except that the elastomer sheet having the composition of Preparation Example 6 was used as the first and second shell moldings.

<Example 4>

The same method as in Example 1-3, except that a first shell molded article was prepared using the elastomer sheet having the composition of Preparation Example 7 and a second outer shell molded article was prepared using the elastomer sheet having the composition of Preparation Example 8. Was used to make a diaphragm.

<Example 5>

A diaphragm was manufactured in the same manner as in Example 1-3, except for irradiating the thermal plasma jet on the first and second skin moldings.

<Comparative Example 1>

A diaphragm was manufactured in the same manner as in Example 1-3, except that the fabric fabric prepared by the method according to Preparation Example 3 was not coated with copper and only the vulcanization coating agent was coated.

<Comparative Example 2>

A diaphragm was manufactured using the same method as in Example 2, except that the fabric fabric prepared by the method according to Preparation Example 3 was not coated with copper and only the vulcanization coating agent was coated.

<Comparative Example 3>

A diaphragm was manufactured in the same manner as in Example 3, except that the fabric fabric prepared by the method according to Preparation Example 3 was not coated with copper and only the vulcanization coating agent was coated.

<Experimental Example> Analysis of properties of diaphragm

(1) bonding performance evaluation

In order to analyze the physical properties of the diaphragm manufactured by the method according to the Examples and Comparative Examples, the adhesion (unit: N/cm ² ) between the outer skin layer and the core layer was evaluated, and the results are shown in Table 1 below.

Adhesion performance evaluation is performed by using a universal testing machine according to ASTM D 1876 of the American Society for Testing and Materials, pulling out at a speed of 50 mm/min under a load cell of 500 N and analyzing the peel test (180° peel). test) was performed and evaluated.

As shown in Table 1, it was confirmed that the diaphragm prepared by the method according to Examples 1 to 5 significantly improved the bonding strength between the core layer and the outer layer as copper sulfide was formed on the fabric fabric due to the copper coating. For this reason, it was judged that the core material layer and the outer skin layer had excellent adhesion, so that they were not easily peeled off, and could be used stably for a long time.

Accordingly, it is predicted that the use of the adhesive can be reduced when the method for manufacturing the diaphragm according to the present invention is used, and the thickness of the cured layer formed by curing of the coating adhesive is thin and thus has excellent flexibility.

In particular, in the case of the diaphragm manufactured by the method according to Example 5, it was confirmed that the adhesion was further improved when the thermal plasma jet was irradiated.

(2) Evaluation of aging characteristics

In order to analyze the physical properties of the diaphragm manufactured by the method according to Examples and Comparative Examples, tensile strength (unit: kgf/cm ² ) and elongation (unit: %) were measured, and tensile strength and elongation were determined according to KS M 6782. It was measured using a universal testing machine, and the results are shown in Table 1 above.

In addition, the aging characteristics of the diaphragm were evaluated, and the results are shown in Table 1 above.

To evaluate the aging characteristics, the diaphragm specimen is stretched at a pressure less than the tensile strength while the diaphragm specimen is heated at a temperature of 100 to 300 ℃ by dividing the permanent set (unit: %) by the characteristics of the elastomer, and then the diaphragm specimen before extension. It was carried out by measuring the length of the diaphragm and the rate of change in the length of the diaphragm specimen after elongation to calculate the permanent strain.

As shown in Table 1, in the case of the diaphragm manufactured by the method according to Examples 1 to 4, it was confirmed that the tensile strength was higher than that of Comparative Examples 1 to 4.

In addition, in the case of the diaphragm manufactured by the method according to Examples 1 to 4, it was confirmed that the permanent deformation rate was lower than that of Comparative Examples 1 to 4, and through this result, the core material layer and It was determined that the bonding strength of the outer skin layer was improved and the fabric fabric reinforced the outer skin layer made of an elastomer to improve mechanical properties.

(3) Fatigue resistance evaluation

In order to analyze the physical properties of the diaphragm manufactured by the method according to Examples and Comparative Examples, the fatigue resistance characteristics of the diaphragm were evaluated, and the results are shown in Table 1 above.

Fatigue resistance evaluation was performed according to the JIS K6270 method, and the number of elongation at the time of fracture (unit: 10,000 cycles) was calculated by repeatedly elongating the diaphragm specimen at 40 °C at the same elongation rate of 100% (± 200%). , The higher the number of elongations, the better the fatigue resistance.

As shown in Table 1, in the case of the diaphragm manufactured by the method according to Examples 1 to 4, it was confirmed that the fatigue resistance was improved compared to Comparative Examples 1 to 4, and through this result, copper sulfide was a fabric fabric As it was formed in, it was determined that the bonding strength between the core layer and the outer skin layer was improved, and thus the inner fatigue performance could also be improved by reinforcing the outer skin layer made of an elastic polymer.

In particular, it can be confirmed that the physical properties can be improved even when the outer shell molded article manufactured using a heterogeneous elastomer is bonded as in Example 5, so that the method for manufacturing the diaphragm according to the present invention can be used in various fields. Became.

Detailed description of the preferred embodiments of the present invention disclosed as described above has been provided to enable those skilled in the art to implement and implement the present invention. Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the scope of the present invention. For example, those skilled in the art can use the configurations described in the above-described embodiments in a manner that combines with each other. Thus, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The present invention may be embodied in other specific forms without departing from the spirit and essential features of the present invention. Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention. The invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, the embodiments may be configured by combining claims that do not have an explicit citation relationship in the claims, or may be included as new claims by amendment after filing.

10: diaphragm
100: deep layer
200: outer layer

Claims (5)

(a) supplying an elastomer to a first mold and molding the supplied elastomer to prepare a first shell molded article;
(b) supplying a fabric fabric coated with copper (Cu) and a vulcanization coating agent on one side of the first shell molding to prepare a laminate including the first shell molding and the fabric fabric;
(c) supplying an elastomer to a second mold and molding the supplied elastomer to prepare a second shell molded article; And
(d) supplying a second shell molding to the upper surface of the fabric fabric of the laminate, heating and pressing to produce a diaphragm having a structure including an outer skin layer and a core layer fixedly formed inside the outer skin layer; including,
The woven fabric,
The thickness is 0.01 to 0.2 mm,
A method of manufacturing a diaphragm, characterized in that it is manufactured using aramid composite fibers formed by twisting a core yarn containing polyurethane fibers and a covering yarn containing aramid fibers on the outer circumferential surface of the polyurethane fibers. delete The method of claim 1,
The copper (Cu) and vulcanization coating agent coated fabric fabric,
(1) pretreatment by immersing the fabric fabric in an acidic solution;
(2) immersing the pretreated fabric fabric in a copper coating solution, heating it to a temperature of 50 to 100°C, and reacting for 30 to 600 minutes to prepare a fabric fabric coated with copper; And
(3) A method of manufacturing a diaphragm, characterized in that it is manufactured by a method comprising the step of coating a vulcanized coating agent on the copper-coated fabric fabric. The method of claim 1,
The step (a) further comprises the step of irradiating the first shell molding with a thermal plasma jet after preparing the first shell molding. The method of claim 1,
The step (c) further comprises the step of irradiating the second shell molding with a thermal plasma jet after preparing the second shell molding.

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