CN113948328A - Thin film switch and preparation method thereof - Google Patents
Thin film switch and preparation method thereof Download PDFInfo
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- CN113948328A CN113948328A CN202111222895.XA CN202111222895A CN113948328A CN 113948328 A CN113948328 A CN 113948328A CN 202111222895 A CN202111222895 A CN 202111222895A CN 113948328 A CN113948328 A CN 113948328A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000010409 thin film Substances 0.000 title description 5
- 239000004020 conductor Substances 0.000 claims abstract description 72
- 239000012528 membrane Substances 0.000 claims abstract description 39
- 239000012212 insulator Substances 0.000 claims abstract description 34
- 239000004743 Polypropylene Substances 0.000 claims abstract description 15
- -1 polypropylene Polymers 0.000 claims abstract description 15
- 229920001155 polypropylene Polymers 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 21
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 238000007650 screen-printing Methods 0.000 claims description 18
- 229920002799 BoPET Polymers 0.000 claims description 15
- 239000004677 Nylon Substances 0.000 claims description 15
- 229920001778 nylon Polymers 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000003085 diluting agent Substances 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- WSANZYFPFILJKZ-UHFFFAOYSA-N 1-[2-[bis(2-hydroxypentyl)amino]ethyl-(2-hydroxypentyl)amino]pentan-2-ol Chemical compound CCCC(O)CN(CC(O)CCC)CCN(CC(O)CCC)CC(O)CCC WSANZYFPFILJKZ-UHFFFAOYSA-N 0.000 claims description 6
- LVUQVFWOWNKFRL-UHFFFAOYSA-N 1-methylcyclohex-2-en-1-ol Chemical compound CC1(O)CCCC=C1 LVUQVFWOWNKFRL-UHFFFAOYSA-N 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 6
- 230000003078 antioxidant effect Effects 0.000 claims description 6
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- 238000001816 cooling Methods 0.000 claims description 6
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- UMKARVFXJJITLN-UHFFFAOYSA-N lead;phosphorous acid Chemical compound [Pb].OP(O)O UMKARVFXJJITLN-UHFFFAOYSA-N 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 6
- 229920001225 polyester resin Polymers 0.000 claims description 6
- 239000004645 polyester resin Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000007639 printing Methods 0.000 claims description 6
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 6
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 229940070527 tourmaline Drugs 0.000 claims description 6
- 229910052613 tourmaline Inorganic materials 0.000 claims description 6
- 239000011032 tourmaline Substances 0.000 claims description 6
- 101001093143 Homo sapiens Protein transport protein Sec61 subunit gamma Proteins 0.000 claims description 3
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 claims description 3
- 101100120905 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) TDH1 gene Proteins 0.000 claims description 3
- 102100027198 Sodium channel protein type 5 subunit alpha Human genes 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000003851 corona treatment Methods 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 238000003698 laser cutting Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000001384 succinic acid Substances 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008275 binding mechanism Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 239000010408 film Substances 0.000 description 7
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 5
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 3
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- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/88—Processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
- H01H13/704—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by the layers, e.g. by their material or structure
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Switches (AREA)
Abstract
The invention discloses a membrane switch and a preparation method thereof, belonging to the field of functional devices and comprising a polypropylene membrane layer, wherein the bottom surface of the polypropylene membrane layer is adhered with an upper circuit conductor layer, the bottom surface of the upper circuit conductor layer is adhered with an insulator layer, the bottom surface of the insulator layer is adhered with a lower circuit conductor layer, a lead-out wire is arranged between the lower circuit conductor layer and the insulator layer, and the other end of the lead-out wire is provided with a bundling mechanism.
Description
Technical Field
The invention relates to the field of functional devices, in particular to a membrane switch and a preparation method thereof.
Background
The membrane switch is an operation system integrating a key function, an indicating element and an instrument panel, is composed of four parts, namely a panel, an upper circuit, an isolating layer and a lower circuit, has the characteristics of rigorous structure, attractive appearance and good sealing property, and is widely applied to the fields of electronic communication and electronic measurement instruments, industrial control, medical equipment, automobile industry, intelligent toys and household appliances.
Through retrieval, chinese patent No. cn201410598324.x discloses a method for manufacturing a keypad membrane switch, which improves the product yield, but the outgoing line of the membrane switch is short, and cannot adapt to the use of different devices, if the outgoing line is extended, the occupied volume of the membrane switch is increased, and the sale and popularization of the device are hindered, and the general manufacturing method has low manufacturing efficiency, and meanwhile, the circuit of the product is not stable enough, so that the normal use of the product is influenced, and the problem of method defects is brought.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a membrane switch and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a membrane switch, includes the polypropylene thin layer, the bottom surface adhesion on polypropylene thin layer has last circuit conductor layer, the bottom surface adhesion on last circuit conductor layer has the insulator layer, the bottom surface adhesion on insulator layer has lower circuit conductor layer, install the lead-out wire between lower circuit conductor layer and the insulator layer, the other end of lead-out wire is installed and is restrainted the mechanism.
Further, the bundling mechanism comprises a transverse plate, a moving rod is sleeved in the transverse plate in a sliding mode, a pull block is fixedly connected to the bottom surface of the moving rod, a clamp is hinged to the top surface of the moving rod, a screw rod is fixedly connected to the other end of the clamp, and a nut is sleeved on the outer surface of the screw rod in a meshed mode.
Further, clamp and lead-out wire joint, screw rod and nut set up about the diaphragm symmetry, and the screw rod cup joints with the diaphragm slides.
A preparation method of a membrane switch comprises the following raw materials in parts by weight: 130 parts of polypropylene film, 30-70 parts of upper circuit conductor layer, 125 parts of insulator layer, 80-95 parts of lower circuit conductor layer, 60-65 parts of polyester resin, 13137.5-17.5 parts of aramid fiber, 3-4 parts of tourmaline powder, 4.5-5 parts of talcum powder, 2.5-3 parts of dibasic lead phosphite, 4-4.5 parts of antioxidant, 0.1-0.2 part of coupling agent and 2.5-3.5 parts of polyvinyl butyral, 2.5-3 parts of antistatic agent SN, 65-70 parts of light-cured insulating ink, 75-90 parts of conductive silver paste, 35-40 parts of silver powder, 5-7.5 parts of epoxy resin, 25-30 parts of ethylene glycol, 2-3 parts of sodium hexametaphosphate, 2.5-4 parts of diluent, 1-2.5 parts of methyl tetrahydrophenol, 1.5-2.5 parts of PVP and 0.25-0.5 part of penetrating agent; the preparation method of the membrane switch comprises the following specific steps:
the method comprises the following steps: preparing 75-90 parts of conductive silver paste;
step two: preparing 30-70 parts of an upper circuit conductor layer and 80-95 parts of a lower circuit conductor layer;
step three: preparing 100-125 parts of an insulator layer;
step four: adhesion synthesis: and sequentially laminating and adhering 30-70 parts of the upper circuit conductor layer, 125 parts of the insulator layer and 80-95 parts of the lower circuit conductor layer, respectively leading out conductive silver paste leads from 30-70 parts of the upper circuit conductor layer and 80-95 parts of the lower circuit conductor layer in the process, and finally covering by using 100 parts of the polypropylene film and 130 parts of the lower circuit conductor layer to obtain the membrane switch.
Further, the specific operations of preparing the upper circuit conductor layer and the lower circuit conductor layer in the second step are as follows:
s1, selecting a 44-micron nylon screen printing plate, and fixing the nylon screen printing plate on a screen printing machine;
s2, performing corona treatment on the PET film, putting 75-90 parts of conductive silver paste on a nylon screen plate in batches through a scraper of a screen printer, and printing the PET film;
s3, placing the printed PET film in an oven for drying, and obtaining a conductive PET film after the conductive silver paste is solidified;
s4, selecting a nylon screen printing plate with the diameter of 100 microns, replacing the nylon screen printing plate with the diameter of 44 microns on a screen printing machine, introducing 65-70 parts of light-cured insulating ink, printing the light-cured insulating ink on the conductive PET film, and curing the light-cured insulating ink through ultraviolet light to obtain a prepared upper circuit conductor layer and a prepared lower circuit conductor layer;
and S5, cutting the redundant part of the prepared upper circuit conductor layer by a laser cutting machine to obtain 30-70 parts of the upper circuit conductor layer, and cutting the redundant part of the prepared lower circuit conductor layer to obtain 80-95 parts of the lower circuit conductor layer.
Further, the temperature of the oven in step S3 is 90 ℃, the drying time is 40min, and the photocurable ink in step S4 is covered on the conductive silver paste without contact.
Further, the specific operation of preparing the insulator layer in the third step is as follows:
SS1, respectively mixing and heating 60-65 parts of polyester resin, 13137.5-17.5 parts of aramid fiber, 3-4 parts of tourmaline powder, 2.5-3 parts of dibasic lead phosphite and 2.5-3.5 parts of polyvinyl butyral;
SS2, sequentially adding 4.5-5 parts of talcum powder, 4-4.5 parts of antioxidant, 0.1-0.2 part of coupling agent and 2.5-3 parts of antistatic agent SN in the process of mixing and heating in the step SS1 to obtain an insulator raw material;
SS3, plasticizing and cooling the insulator material to obtain 100-125 parts of the insulator layer.
Further, the preparation of the conductive silver paste in the first step comprises the following steps:
SSS1, preparing mixed liquor: mixing 25-30 parts of ethylene glycol and 5-7.5 parts of epoxy resin, heating to 70-75 ℃, continuously stirring until 5-7.5 parts of epoxy resin are completely dissolved, adding 1.5-2.5 parts of PVP and 0.15-0.25 part of penetrating agent, and uniformly mixing to obtain a mixed solution;
SSS2, 35-40 parts of pretreated silver powder: putting 35-40 parts of silver powder into succinic acid solution, performing ultrasonic oscillation for 30-40min to remove dirt and impurities in the silver powder, and cleaning the silver powder by using distilled water to finish pretreatment;
SSS3, putting 35-40 parts of pretreated silver powder into the mixed solution, adding 2-3 parts of sodium hexametaphosphate and 2.5-4 parts of diluent, heating and stirring simultaneously, cooling after mixing uniformly, adding 1-2.5 parts of methyl tetrahydrophenol and 0.1-0.25 part of penetrating agent, and mixing fully to obtain 75-90 parts of conductive silver paste.
Further, the particle size of the silver powder is 30-50 μm, and the diluent is acetone.
Compared with the prior art, the invention has the beneficial effects that:
1. the foldable outgoing line is clamped by the clamp, the pull block is pulled downwards, the clamp is driven to move downwards by the pull block through the moving rod, the screw penetrates through the transverse plate while the clamp extrudes the outgoing line, the nut is connected with the screw, the purpose of fixing the position of the screw is achieved, the clamp and the outgoing line are further fixed, the occupied area of the outgoing line is limited, the occupied volume of the membrane switch is reduced, meanwhile, the length of the outgoing line can be adjusted, and the membrane switch is beneficial to sale and popularization of the device.
2. According to the invention, the conductive performance of the thin film switch is improved by using the conductive silver paste, the conductive silver paste is simple and convenient to prepare, the processing efficiency of the thin film switch is preliminarily improved, and the upper circuit conductor layer and the lower circuit conductor layer can be simultaneously prepared, so that the processing efficiency of the thin film switch is further improved, and by processing layer by layer, the circuit error of a product can be avoided, the quality of the product is ensured, and the service life of the product is further prolonged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic view of an overall structure of a membrane switch according to the present invention;
fig. 2 is a schematic view of a bundling mechanism of a membrane switch according to the present invention;
fig. 3 is a front view of a binding mechanism of a membrane switch according to the present invention;
fig. 4 is a process diagram of a method for manufacturing a membrane switch according to the present invention.
In the figure: 1. a polypropylene film layer; 2. an upper circuit conductor layer; 3. an insulator layer; 4. a lower circuit conductor layer; 5. an outgoing line; 6. a bundling mechanism; 61. a transverse plate; 62. a travel bar; 63. pulling the block; 64. clamping a hoop; 65. a screw; 66. and a nut.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a membrane switch, including polypropylene film layer 1, the bottom surface adhesion of polypropylene film layer 1 has last circuit conductor layer 2, the bottom surface adhesion of going up circuit conductor layer 2 has insulator layer 3, the bottom surface adhesion of insulator layer 3 has lower circuit conductor layer 4, install lead-out wire 5 between lower circuit conductor layer 4 and the insulator layer 3, it constructs 6 to restraint to install the other end of lead-out wire 5, it constructs 6 including diaphragm 61 to restraint, sliding sleeve has the carriage release lever 62 in the diaphragm 61, the bottom surface rigid coupling of carriage release lever 62 has draws piece 63, the top surface of carriage release lever 62 articulates there is clamp 64, the other end rigid coupling of clamp 64 has screw rod 65, nut 66 has been cup jointed in screw rod 65's surface meshing, clamp 64 and 5 joints of lead-out wire, screw rod 65 and nut 66 set up about diaphragm 61 symmetry, and screw rod 65 and diaphragm 61 sliding sleeve joint.
Concretely, at the in-process of adjustment lead-out wire 5, tensile lead-out wire 5, make lead-out wire 5 extension, it is folding with remaining part's lead-out wire 5, again with clamp 64 joint in folding top, and pull down the pull block 63, make the pull block 63 pass through the carriage release lever 62 and drive clamp 64 and move down, thereby when making clamp 64 extrusion lead-out wire 5, screw rod 65 runs through diaphragm 61, be connected nut 66 and screw rod 65 again, reach the purpose of clamping screw 65 position, and then clamp 64 and lead-out wire 5 have been fixed, the area of occupation of lead-out wire 5 has been restrainted in the receipts, thereby the occupation volume of membrane switch has been reduced, simultaneously the length of lead-out wire 5 can be adjusted, do benefit to the sale and the popularization of device.
Example 2:
referring to fig. 4, the present invention provides a technical solution: a preparation method of a membrane switch comprises the following raw materials in parts by weight: 100 parts of a polypropylene film, 30 parts of an upper circuit conductor layer, 100 parts of an insulator layer, 80 parts of a lower circuit conductor layer, 60 parts of polyester resin, 13137.5 parts of aramid fiber, 3 parts of tourmaline powder, 4.5 parts of talcum powder, 2.5 parts of dibasic lead phosphite, 4 parts of an antioxidant, 0.1 part of a coupling agent, 2.5 parts of polyvinyl butyral, 2.5 parts of an antistatic agent SN, 65 parts of light-cured insulating ink, 75 parts of conductive silver paste, 35 parts of silver powder, 5 parts of epoxy resin, 25 parts of ethylene glycol, 2 parts of sodium hexametaphosphate, 2.5 parts of a diluent, 1 part of methyl tetrahydrophenol, 1.5 parts of PVP (polyvinyl pyrrolidone) and 0.25 part of a penetrating agent; the preparation method of the membrane switch comprises the following specific steps:
the method comprises the following steps: 75 parts of conductive silver paste is prepared;
step two: preparing 30 parts of an upper circuit conductor layer and 80 parts of a lower circuit conductor layer;
step three: preparing 100 parts of an insulator layer;
step four: adhesion synthesis: sequentially laminating and adhering 30 parts of an upper circuit conductor layer, 100 parts of an insulator layer and 80 parts of a lower circuit conductor layer, respectively leading out conductive silver paste leads from 30 parts of the upper circuit conductor layer and 80 parts of the lower circuit conductor layer in the process, and finally covering by 100 parts of a polypropylene film to obtain a membrane switch;
the specific operations for preparing 30 parts of the upper circuit conductor layer and 80 parts of the lower circuit conductor layer in this embodiment are as follows:
s1, selecting a 44-micron nylon screen printing plate, and fixing the nylon screen printing plate on a screen printing machine;
s2, performing corona treatment on the PET film, putting 75-90 parts of conductive silver paste on a nylon screen plate in batches through a scraper of a screen printer, and printing the PET film;
s3, placing the printed PET film in an oven for drying, and obtaining a conductive PET film after the conductive silver paste is solidified;
s4, selecting a nylon screen printing plate with the diameter of 100 microns, replacing the nylon screen printing plate with the diameter of 44 microns on the screen printing machine, introducing 65 parts of light-cured insulating ink, printing the light-cured insulating ink on the conductive PET film, and curing the light-cured insulating ink through ultraviolet light to obtain an upper circuit conductor layer and a lower circuit conductor layer;
s5, cutting the redundant part of the prepared upper circuit conductor layer by a laser cutting machine to obtain 30 parts of the upper circuit conductor layer, cutting the redundant part of the prepared lower circuit conductor layer to obtain 80 parts of the lower circuit conductor layer, wherein the temperature of the oven in the step S3 is 90 ℃, the drying time is 40min, and the light-curing type ink covers the conductive silver paste which does not need to be contacted in the step S4;
it is further noted that the temperature of the oven is 90 ℃, the drying time is 40min, and the light-cured ink is covered on the conductive silver paste without contact.
The specific operation of preparing 100 parts of the insulator layer in this example was:
SS1, respectively mixing and heating 60 parts of polyester resin, 13137.5 parts of aramid fiber, 3 parts of tourmaline powder, 2.5 parts of dibasic lead phosphite and 2.5 parts of polyvinyl butyral;
SS2, sequentially adding 4.5 parts of talcum powder, 4 parts of antioxidant, 0.1 part of coupling agent and 2.5 parts of antistatic agent SN in the process of mixing and heating in the step SS1 to obtain an insulator raw material;
SS3, plasticizing and cooling the insulator raw material to obtain 100 parts of an insulator layer;
the preparation of 75 parts of conductive silver paste in this example comprises the following steps:
SSS1, preparing mixed liquor: mixing 25 parts of ethylene glycol and 5 parts of epoxy resin, heating to 70 ℃, continuously stirring until the 5 parts of epoxy resin are completely dissolved, adding 1.5 parts of PVP and 0.15 part of penetrant, and uniformly mixing to obtain a mixed solution;
SSS2, 35 parts of pretreated silver powder: putting 35 parts of silver powder into succinic acid solution, ultrasonically oscillating for 30min to remove dirt and impurities in the silver powder, and then cleaning the silver powder by using distilled water to finish pretreatment;
SSS3, putting 35 parts of the pretreated silver powder into the mixed solution, adding 2 parts of sodium hexametaphosphate and 2.5 parts of diluent, heating and stirring simultaneously, cooling after uniformly mixing, adding 1 part of methyl tetrahydrophenol and 0.1 part of penetrant, and fully mixing to obtain 75 parts of conductive silver paste;
it should be further noted that the particle size of the silver powder is 30 μm, and the diluent is acetone.
Specifically, in the process of membrane switch processing, the use through electrically conductive silver thick liquid makes membrane switch's electric conductive property improve, and can prepare circuit conductor layer and lower circuit conductor layer simultaneously to membrane switch's machining efficiency has been improved, and through the independent processing of individual layer, can avoid product circuit mistake, has guaranteed the quality of product, and then has prolonged the life of product.
The working principle and the using process of the invention are as follows: after extension of the outgoing line 5 of the membrane switch, the outgoing line 5 of the rest part is folded, the clamp 64 is clamped above the folding part, the pull-down block 63 is pulled down, the pull-down block 63 drives the clamp 64 to move downwards through the moving rod 62, the clamp 64 extrudes the outgoing line 5, the screw rod 65 penetrates through the transverse plate 61, the nut 66 is connected with the screw rod 65 again, the purpose of fixing the position of the screw rod 65 is achieved, the clamp 64 and the outgoing line 5 are further fixed, the occupied area of the outgoing line 5 is limited, the occupied volume of the membrane switch is reduced, meanwhile, the length of the outgoing line 5 can be adjusted, the device is beneficial to sale and popularization, and operation is completed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The utility model provides a membrane switch, includes polypropylene film layer (1), its characterized in that, the bottom surface adhesion of polypropylene film layer (1) has last circuit conductor layer (2), the bottom surface adhesion of going up circuit conductor layer (2) has insulator layer (3), the bottom surface adhesion of insulator layer (3) has lower circuit conductor layer (4), install between lower circuit conductor layer (4) and insulator layer (3) lead-out wire (5), the other end of lead-out wire (5) is installed and is received and restraint mechanism (6).
2. The membrane switch according to claim 1, wherein the binding mechanism (6) comprises a transverse plate (61), a moving rod (62) is slidably sleeved in the transverse plate (61), a pulling block (63) is fixedly connected to the bottom surface of the moving rod (62), a clamp (64) is hinged to the top surface of the moving rod (62), a screw rod (65) is fixedly connected to the other end of the clamp (64), and a nut (66) is sleeved on the outer surface of the screw rod (65) in a meshed manner.
3. The membrane switch according to claim 2, wherein the clamp (64) is clamped with the lead-out wire (5), the screw rod (65) and the nut (66) are symmetrically arranged about the transverse plate (61), and the screw rod (65) is slidably sleeved with the transverse plate (61).
4. The preparation method of the membrane switch is characterized in that the membrane switch is prepared from the following raw materials in parts by weight: 130 parts of polypropylene film, 30-70 parts of upper circuit conductor layer, 125 parts of insulator layer, 80-95 parts of lower circuit conductor layer, 60-65 parts of polyester resin, 13137.5-17.5 parts of aramid fiber, 3-4 parts of tourmaline powder, 4.5-5 parts of talcum powder, 2.5-3 parts of dibasic lead phosphite, 4-4.5 parts of antioxidant, 0.1-0.2 part of coupling agent and 2.5-3.5 parts of polyvinyl butyral, 2.5-3 parts of antistatic agent SN, 65-70 parts of light-cured insulating ink, 75-90 parts of conductive silver paste, 35-40 parts of silver powder, 5-7.5 parts of epoxy resin, 25-30 parts of ethylene glycol, 2-3 parts of sodium hexametaphosphate, 2.5-4 parts of diluent, 1-2.5 parts of methyl tetrahydrophenol, 1.5-2.5 parts of PVP and 0.25-0.5 part of penetrating agent; the preparation method of the membrane switch comprises the following specific steps:
the method comprises the following steps: preparing 75-90 parts of conductive silver paste;
step two: preparing 30-70 parts of an upper circuit conductor layer and 80-95 parts of a lower circuit conductor layer;
step three: preparing 100-125 parts of an insulator layer;
step four: adhesion synthesis: and sequentially laminating and adhering 30-70 parts of the upper circuit conductor layer, 125 parts of the insulator layer and 80-95 parts of the lower circuit conductor layer, respectively leading out conductive silver paste leads from 30-70 parts of the upper circuit conductor layer and 80-95 parts of the lower circuit conductor layer in the process, and finally covering by using 100 parts of the polypropylene film and 130 parts of the lower circuit conductor layer to obtain the membrane switch.
5. The method for manufacturing a membrane switch according to claim 4, wherein the specific operations of manufacturing the upper circuit conductor layer and the lower circuit conductor layer in the second step are as follows:
s1, selecting a 44-micron nylon screen printing plate, and fixing the nylon screen printing plate on a screen printing machine;
s2, performing corona treatment on the PET film, putting 75-90 parts of conductive silver paste on a nylon screen plate in batches through a scraper of a screen printer, and printing the PET film;
s3, placing the printed PET film in an oven for drying, and obtaining a conductive PET film after the conductive silver paste is solidified;
s4, selecting a nylon screen printing plate with the diameter of 100 microns, replacing the nylon screen printing plate with the diameter of 44 microns on a screen printing machine, introducing 65-70 parts of light-cured insulating ink, printing the light-cured insulating ink on the conductive PET film, and curing the light-cured insulating ink through ultraviolet light to obtain a prepared upper circuit conductor layer and a prepared lower circuit conductor layer;
and S5, cutting the redundant part of the prepared upper circuit conductor layer by a laser cutting machine to obtain 30-70 parts of the upper circuit conductor layer, and cutting the redundant part of the prepared lower circuit conductor layer to obtain 80-95 parts of the lower circuit conductor layer.
6. The method of claim 5, wherein the oven temperature in step S3 is 90 ℃, the baking time is 40min, and the photo-curable ink is coated on the non-contact conductive silver paste in step S4.
7. The method for manufacturing a membrane switch according to claim 4, wherein the specific operation of manufacturing the insulator layer in step three is:
SS1, respectively mixing and heating 60-65 parts of polyester resin, 13137.5-17.5 parts of aramid fiber, 3-4 parts of tourmaline powder, 2.5-3 parts of dibasic lead phosphite and 2.5-3.5 parts of polyvinyl butyral;
SS2, sequentially adding 4.5-5 parts of talcum powder, 4-4.5 parts of antioxidant, 0.1-0.2 part of coupling agent and 2.5-3 parts of antistatic agent SN in the process of mixing and heating in the step SS1 to obtain an insulator raw material;
SS3, plasticizing and cooling the insulator material to obtain 100-125 parts of the insulator layer.
8. The method for preparing a membrane switch according to claim 4, wherein the step one of preparing the conductive silver paste comprises the following steps:
SSS1, preparing mixed liquor: mixing 25-30 parts of ethylene glycol and 5-7.5 parts of epoxy resin, heating to 70-75 ℃, continuously stirring until 5-7.5 parts of epoxy resin are completely dissolved, adding 1.5-2.5 parts of PVP and 0.15-0.25 part of penetrating agent, and uniformly mixing to obtain a mixed solution;
SSS2, 35-40 parts of pretreated silver powder: putting 35-40 parts of silver powder into succinic acid solution, performing ultrasonic oscillation for 30-40min to remove dirt and impurities in the silver powder, and cleaning the silver powder by using distilled water to finish pretreatment;
SSS3, putting 35-40 parts of pretreated silver powder into the mixed solution, adding 2-3 parts of sodium hexametaphosphate and 2.5-4 parts of diluent, heating and stirring simultaneously, cooling after mixing uniformly, adding 1-2.5 parts of methyl tetrahydrophenol and 0.1-0.25 part of penetrating agent, and mixing fully to obtain 75-90 parts of conductive silver paste.
9. The method of claim 8, wherein the silver powder has a particle size of 30-50 μm, and the diluent is acetone.
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| CN202111222895.XA CN113948328A (en) | 2021-10-20 | 2021-10-20 | Thin film switch and preparation method thereof |
| CN202410072411.5A CN117810009A (en) | 2021-10-20 | 2021-10-20 | Preparation method of membrane switch |
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