KR20060070508A - A bonding of guttation type for metal key making - Google Patents

Abstract

The present invention relates to a metal keypad used in various information and communication devices such as mobile phones, PDAs, MP3, etc. More specifically, the development of the manufacturing process by the development of the adhesive medium that is not released when molding the silicon pad on the metal keypad It is related with the invention which can reduce the production cost along with the improvement of productivity due to the simplification, and solve the problem of leaking the adhesive liquid and lowering the value of the product.

The present invention consists of butylglycol acetate, methoxy methylleseal acetate, bisphenol (epichloridrin), cyclohexanone, solvent naphtha (petroleum salt) heviarom, xylene, solvent naphtha (petroleum salt) light arom, trimetal benzene It can be achieved by a one-component adhesive for producing a metal keypad consisting of a mixture of a curing agent consisting of N-butyl acetyl acetate, toluene diisocynet to the adhesive liquid.

Keypad board, molding mold, lower mold, upper mold, silicone, film one-component adhesive, silicone pad

Description

One-part adhesive for metal key pad manufacturing {A bonding of guttation type for metal key making}

1a to e is a manufacturing process diagram of a metal keypad using a one-component adhesive according to the present invention.

<Description of the symbols used in the main parts of the drawing>

10: keypad 20: film

30: silicon 40: silicon pad

100: one component adhesive

The present invention relates to a metal keypad used in various information and communication devices such as mobile phones, PDAs, MP3, etc. More specifically, the development of the manufacturing process by the development of the adhesive medium that is not released when molding the silicon pad on the metal keypad It is related with the invention which can reduce the production cost along with the improvement of productivity due to the simplification, and solve the problem of leaking the adhesive liquid and lowering the value of the product.

In general, a metal keypad is used as a switching device for various information communication devices such as mobile phones, PDAs, and MP3s.

The metal keypad used as described above affects the slimming of the communication device according to how thin the thickness can be.

The metal keypad of the communication device is composed of a keypad plate, a film and a silicon pad.

The metal keypad formed as described above has a metal pad interposed between the metal keypad and the silicon pad because the resin-based silicone pads are hard-adhesive materials.

By the way, in the case of molding the silicone pad through the film as described above, the film having a poor adhesion to the keypad plate should be bonded using an adhesive means.

As a means for adhering the film to the keypad, a double-sided tape and a two-component adhesive are used.

When the film is adhered to the keypad plate of the metal material using the double-sided tape of the above method, the adhesive liquid of the double-sided tape leaks to the outside as time passes, as well as the assembly of the silicon pad manufactured separately When the silicone pad is adhesively assembled to the keypad plate, the ribs and key buttons forming the silicone pad may not sufficiently enter the key grooves of the keypad plate due to the thickness of the adhesive tape. The penetratingly formed key grooves may be in a penetrating state so that a manufacturing process for filling the key grooves with an epoxy or melamine resin is added, thereby making the manufacturing process complicated.

The method developed to solve the shortcomings of the metal keypad manufacturing method using the double-sided tape is a method of adhering a film paper to the keypad plate of a metal material using an adhesive, for example, Korean Patent No. 568963.

The above-mentioned pre-invention describes that a keypad for applying each adhesive twice can be produced, and it can also be seen that a method for mixing each adhesive can also be used.

However, as can be seen from the detailed description, the pre-registered invention is applied to the adhesive liquid consisting of a liquid primary adhesive made of a thermosetting type on the metal key sheet, that is, 25 to 60 weight of PMMA resin and 5 to 20 weight of propylene glycol monomethyl ether. The adhesive consisting of a mixture of a polyisocyanate resin 70 ~ 80 weight and a curing agent consisting of 20 ~ 30 weight of ethyl acetate is first applied to the metal key sheet and then cured in a drying apparatus having a predetermined temperature to form an adhesive layer.

The polyurethane-based film is adhered to the adhesive layer formed on the metal key sheet as described above, wherein an adhesive made of urethane-based synthetic resin 20-30 weight and cyclohexanone 40-50 weight is first applied to the adhesive layer. To the polyurethane-based film of

After the liquid silicone rubber is applied onto the polyurethane-based film bonded as described above, the manufacturing of the keypad is completed as the upper mold is thermocompressed.

On the other hand, it can be seen that the pre-registered invention can also be used to prepare a metal key sheet using an adhesive comprising both the adhesive and the curing agent constituting the two-component adhesive described above.

In the above-described pre-invention, after applying the primary adhesive to the metal key sheet, the curing process, after laminating the film in the state of applying the adhesive of another component to the cured adhesive, and then applying a silicone rubber on the film It is a method of manufacturing and completing a metal keypad by thermo-compressing a silicon rubber with an upper mold (also called "two-component adhesive method"), which not only complicates the work process but also takes time to cure the adhesive applied to the metal key sheet first. It takes a long time to improve productivity, and the first applied cured adhesive is exposed to the cutting line, the number, and the character line, which causes the problem of degrading the quality of the produced metal keypad.

On the other hand, it is described that the metal key pad can be easily manufactured by mixing the adhesive applied first to the metal key sheet and the adhesive applied second to the first coated adhesive at the same mixing ratio, but only after a certain curing time, It is described that not only the mixing | blending of the adhesive agent apply | coated secondary to the hardened | cured primary application | coating adhesive agent but also the mixing ratio similar to the primary application adhesive which consists of this is described.

As described above, when the primary coating adhesive and the secondary coating adhesive are simply mixed, the curing agent does not exhibit the proper performance and the adhesiveness is lowered, causing the film to fall from the metal key sheet due to the poor adhesion. Will appear.

The present invention is to solve the shortcomings of the two-component adhesives used in the manufacture of metal keypads, the purpose of which is a hard-adhesive metal keypad material (stainless steel, phosphor bronze, alloy) and film (TPU, PC, PU, By using a one-component adhesive that enables stable lamination by applying a single adhesive to PA, etc., it reduces the productivity and the cost of production of metal keypad, which is a problem when using the conventional two-component adhesive. It is to provide a one-component adhesive for producing a metal keypad that can improve the quality of the metal keypad with a stable lamination of the material and the film.

The present invention for achieving the above object, butyl glycol acetate, methoxy methylleseal acetate, bisphenol (epichloridrin), cyclohexanone, solvent naphtha (petroleum salt) heviarom, xylene, solvent naphtha (petrol salt) light It can be achieved by a one-component adhesive for producing a metal keypad, characterized in that the mixture consisting of a hardening agent consisting of N- butyl acetate, toluene diisocynet to the adhesive liquid consisting of arom, trimetal benzene.

Hereinafter, described in detail by the accompanying drawings a preferred embodiment for achieving the above object is as follows.

The one-component adhesive for producing a metal keypad of the present invention consists of a mixture of an adhesive liquid and a curing agent.

The adhesive solution is 20 to 25% by weight of butyl glycol acetate (BUTYLGLYCOL ACETATE), 10 to 15% by weight of methoxy methyl acetylyl acetate (BISPHENOL) (epichloridrin: EPICHLORHYDRIN) 10 to 15% by weight , Cyclohexanone (CYCLOHEXANONE) 5-10% weight, SOLVENT NAPHTHA (petroleum salt PETROLEUM) HEAVY AROM 1-5% weight, xylene (XYLENE) 1-5% weight, solvent naphtha (SOLVENT NAPHTHA) It consists of 0.5-1% by weight of petroleum salt (PETROLEUM) and 0-0.5% by weight of TRIMETHYLBENZENZE.

The curing agent to be mixed in the adhesive solution, N-BUTYL ACETATE 23 to 52.5% by weight, toluene DIISOCYANATE (TOLUENE DIISOCYANATE) 0 to 0.5% by weight.

When manufacturing a metal keypad using a one-component adhesive consisting of a mixture of the adhesive solution and the curing agent as described above, the cutting line and the numbers and letters that form the boundary of the button by etching the metal keypad material (stainless steel, phosphor bronze, alloy) A keypad plate 10 prepared by drilling a line is prepared as in FIG. 1 a).

One-part adhesive 100 is applied to the keypad plate 10 prepared as described above, as shown in FIG.

The film (TPU, PC, PU, PA, etc.) 20 is laminated on the keypad 10 to which the one-component adhesive 100 is applied.

The keypad plate 10 on which the film 20 is laminated through the one-component adhesive 100 is positioned so that the numbers and letters formed on the keypad plate 10 coincide with each other.

In the state where the keypad plate 10 is positioned in the lower mold, the silicon 30 is evenly distributed (coated) on the film 20 as shown in FIG.

In the state where the silicon 30 is evenly distributed on the film 20, the upper mold is moved to the lower mold.

As described above, the molding mold for placing the keypad 10 and forming the metal keypad is heated with a heat of 100 ° C. to 150 ° C. in the lower mold and the upper mold so that the silicon 30 distributed (coated) on the film 20 is formed. While being thermally compressed, the silicone pad 40 is formed while being unfolded with respect to the entire surface of the film 20. At the same time, the one-component adhesive 100 is thermally cured so that the keypad 10 and the film 20 are firmly bonded to each other. The manufacture of the keypad is to be completed as in Figure 1 e).

As described above, the one-component adhesive for producing a metal keypad of the present invention includes a keypad plate 10 and a film (TPU, PC, PU, PA, etc.) that are hard-adhesive metal keypad materials (stainless steel, phosphor bronze, alloy) (20). ) Is composed of butylglycol acetate, methoxy methylleseal acetate, bisphenol (epichloridrin), cyclohexanone, solvent naphtha (petroleum salt) heviarom, xylene, solvent naphtha (petroleum salt) light arom, trimetal benzene When one-component adhesive 100 is used, a stable application can be achieved by applying a one-component adhesive 100 composed of a mixture of a hardener composed of N-butyl acetylacetate and doluene diisocynet to the liquid. It eliminates the work hassles that had to be applied at all times, as well as reducing the productivity of metal keypads and the increase in production costs, as well as metal keypad materials. It has the advantage of being able to improve the quality of the metal keypad stable lamination of the keypad plate (10) and the film (20).

Claims (2)

Butyl glycol acetate, methoxy methylleseal acetate, bisphenol (epichloridrin), cyclohexanone, solvent naphtha (petroleum salt) heviarom, xylene, solvent naphtha (petroleum salt) light arom, trimetalbenzene A one-component adhesive for producing a metal keypad, comprising a mixture of a curing agent consisting of N-butyl acetate and doluene diisocynet. According to claim 1, Component ratio of the one-component adhesive for producing the metal keypad, 20-25% of butyl glycol acetate, 10-15% of methoxy methylleseal acetate, 10-15% of bisphenol (epichloridrin), 5-10% by weight of cyclohexanone, solvent naphtha (petroli salt) heviarom N-Butyl Acetate 23 to 52.5% by weight in an adhesive liquid consisting of 1 to 5% by weight, 1 to 5% by weight of xylene, 0.5 to 1% by weight of solvent naphtha (petroleum salt) light arom, and 0 to 0.5% by weight of trimetalbenzene , Doluene diisocyanine 0-0.5% by weight of a one-part adhesive for metal keypad manufacturing, characterized in that.

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