CN101740242B - Method for preparing polycarbonate and silica gel composite key - Google Patents
Method for preparing polycarbonate and silica gel composite key Download PDFInfo
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- CN101740242B CN101740242B CN2008102178427A CN200810217842A CN101740242B CN 101740242 B CN101740242 B CN 101740242B CN 2008102178427 A CN2008102178427 A CN 2008102178427A CN 200810217842 A CN200810217842 A CN 200810217842A CN 101740242 B CN101740242 B CN 101740242B
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- silica gel
- coupling agent
- polycarbonate substrate
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- corona treatment
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Abstract
A method for preparing a polycarbonate and silica gel composite key comprises the following steps: (1) carrying out corona treatment on a polycarbonate substrate; (2) coating a coupling agent on the polycarbonate substrate after corona treatment and drying; and (3) coating liquid silica gel on the polycarbonate substrate coated with the coupling agent and vulcanizing to obtain the polycarbonate and silica gel composite key. The polycarbonate and silica gel composite key prepared by the method has uniform and controllable thickness and lower requirement for equipment, dispenses with dies with higher accuracy and is suitable for large-scale industrial production.
Description
Technical field
The present invention relates to the preparation method of the composite-key of a kind of Merlon and silica gel.
Background technology
The composite-key of Merlon and silica gel is widely used in electronic products such as mobile phone, mp3; In order to satisfy the button ultrathin design of electronic product; The general ultrathin design that the method for Merlon (PC) substrate and silica gel combination is realized button that adopts; Main manufacture method has two kinds at present: first kind is directly to adopt bonding PC substrate of double faced adhesive tape and silica gel sheet, has bonding not firm problem; Another kind is at PC substrate surface hot pressing one deck liquid-state silicon gel; General hot pressing temperature is about 100-110 ℃, pressure 25Mpa; Though the method can make PC and silica gel be bonded together securely, cause the PC distortion after the hot pressing easily, make the uniformity of silica gel layer receive bigger influence simultaneously; When the thickness of silica gel layer was 200um, the uniformity was 50～100um.
The hot pressing of employing one deck liquid-state silicon gel is also arranged on the PC surface in the prior art; The uniformity of silica gel layer is controlled at preferably in the scope; As, when the thickness of silica gel layer was 200um, the uniformity was 10～30um; But such product is very high to the required precision of mould, and often requiring mould and die accuracy is 5～10um.
Summary of the invention
The technical problem that the present invention will solve is how to make the thickness evenness of silica gel layer controlled and lower to equipment requirements, and the cohesive force of PC and silica gel is better simultaneously.
The composite-key preparation method of a kind of Merlon and silica gel comprises the steps:
(1) polycarbonate substrate is carried out corona treatment;
(2) coated with coupling agent and dry on the polycarbonate substrate after the corona treatment;
(3) be coated with apply liquid-state silicon gel on the polycarbonate substrate of coupling agent, sulfuration obtains the composite-key of Merlon and silica gel.
Adopt the Merlon and the silica gel composite-key of preparation method's preparation of the present invention, the thickness evenness of silica gel layer is controlled, and when being 200um like the thickness when silica gel layer among the embodiment 1, the uniformity is 10um; And lower to equipment requirements, do not need precision die, be fit to large-scale commercial production.
Embodiment
The composite-key preparation method of a kind of Merlon and silica gel comprises the steps:
(1) polycarbonate substrate is carried out corona treatment;
(2) on the polycarbonate substrate after the corona treatment, apply coupling agent;
(3) apply liquid-state silicon gel, the high temperature vulcanized composite-key that obtains Merlon and silica gel on the polycarbonate substrate of coupling agent being coated with.
Described polycarbonate substrate is the known polycarbonate substrate of those skilled in the art; Can carry out shaped design according to the needs of button; Described polyurethane substrate can adopt the form injection moulding all-in-one-piece polycarbonate substrate of integral molded plastic, can be the die-cut desired structure that obtains of PC sheet with polycarbonate sheet directly also.Each independently has the slit that each button difference is come between the button; Independently also there is connecting portion in each between the button simultaneously, and each is independently linked together between the button, forms conjuncted button.
Described corona treatment is a kind of common surface treatment mode, and the purpose of corona treatment is through under the high voltage electric field effect, and the PC substrate is carried out strong impact to electron stream so that the substrate surface roughening increases the contact area of coupling agent to PC; Can adopt the corona machine of selling on the market that the PC substrate is carried out corona treatment.The condition of corona treatment is as well known to those skilled in the art; Inventor of the present invention finds through a large amount of experiments; To the PC substrate; Preferably the condition of corona treatment is 2～5 kilowatts for the corona treatment acc power, 1～5 second of processing time, thus make the bonding of follow-up coupling agent and PC substrate more firm.
Coupling agent of the present invention is the common silane coupler that is used for polycarbonate surface of those skilled in the art; Described silane coupler is selected from γ-An Bingjisanjiayangjiguiwan, VTES, vinyltrimethoxy silane, γ-chloropropyl triethoxysilane, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide, anilinomethyl triethoxysilane, N-β (aminoethyl)-γ-An Bingjisanjiayangjiguiwan, N-(β-aminoethyl)-gamma-aminopropyl-triethoxy-silane, N-β (aminoethyl)-γ-aminopropyl methyl dimethoxysilane, γ-(2; 3-epoxy third oxygen) a kind of in propyl trimethoxy silicane, γ-(methacryloxypropyl) oxypropyl trimethyl silane, γ-Qiu Jibingjisanjiayangjiguiwan, γ-sulfydryl propyl-triethoxysilicane, γ-(3, the 4-epoxycyclohexyl) ethyl trimethoxy silane.The thickness of said coated with coupling agent is 0.5～1um.
Described liquid-state silicon gel is the known liquid-state silicon gel of those skilled in the art, is preferably two component liquid-state silicon gels, and the shore hardness of silica gel is between 50～80.
Described sulfuration is the condition of the known liquid-state silicon gel sulfuration of those skilled in the art, and conditions of vulcanization of the present invention is 130 ℃～150 ℃ of curing temperatures, cure time 10～20 minutes.
The method that applies coupling agent in the said step (2) is for to apply coupling agent with a kind of mode in coating, silk screen printing, the spraying at polycarbonate substrate, and drying obtains being covered with the polycarbonate substrate of coupling agent.
Described coating, silk screen printing, spraying are the method for the known coating of those skilled in the art.Said particularly coating also can adopt I-shaped spreader or line rod spreader to apply; Coating thickness, the uniformity of described I-shaped spreader or line rod spreader requires, applies effective width and can customize according to requirement of products; The method of this coating can make silica gel layer reach required thickness, and the uniformity that obtains silica gel layer after the coating can reach 10um.The thickness requirement of the silica gel layer that obtains after the liquid-state silicon gel sulfuration of the present invention to the composite-key of Merlon and silica gel can be formulated according to the design demand of button, is preferably, and thickness 195-205um, the uniformity is 10um.
Method of testing:
1, evenness of membranous layer test
Adopt the uniformity testing method of the known rete of those skilled in the art, the present invention adopts the mensuration of GB6672-86 plastic film and sheet thickness.
Extreme difference is that the value of the uniformity is more little, explains that the thickness of silica gel layer is even more.
2, the PC substrate deformation of the composite-key of Merlon and silica gel is observed
The composite-key that naked eyes can be observed the Merlon for preparing and silica gel has or not distortion situation such as curl.
3, peel off test
Peel off test state label: GB/T8808-1988.
Test result:
OK: peeling force is greater than the fracture load of the silica gel that is adopted
NG: peeling force is less than the fracture load of the silica gel that is adopted
Wherein, peeling force is peeled off the peeling force that records according to GB/T8808-1988; The fracture load of silica gel records according to GB/T13022-1991.
Through concrete embodiment the present invention is explained further below
Embodiment 1
Thickness is the PC substrate of 200um; With corona treatment 3 kw of power; Handled for 1 second, obtain the PC substrate of corona treatment, on the polycarbonate substrate after the corona treatment, apply coupling agent γ-An Bingjisanjiayangjiguiwan (XP81-C0431 of Toshiba); The thickness of the coupling agent that applies is 0.5um, applies the back and adopts 70 ℃ temperature drying to obtain being coated with the polycarbonate substrate of coupling agent in 30 minutes.On the PC substrate of handling, adopt I-shaped spreader (the coating thickness 200um of I-shaped spreader, uniformity 5um apply effective width 10cm) to apply liquid-state silicon gel (the two component liquid-state silicon gels of the LSR7070 of Toshiba), the shore hardness of this liquid-state silicon gel is 70 degree.Vulcanize the composite-key that obtained Merlon and silica gel in 10 minutes down at 140 ℃.Adopting above-mentioned method of testing to test the average thickness that obtains silica gel layer is 200um, and the uniformity is 10um.
Embodiment 2
Identical with embodiment 1, distinctive points is that the coupling agent that adopts is different.The coupling agent that adopts is N-β (aminoethyl)-γ-An Bingjisanjiayangjiguiwan (XP81-6361 of Toshiba).
Embodiment 3
Identical with embodiment 1, distinctive points is to adopt line rod spreader (the coating thickness 200um of line rod spreader) liquid towards silica gel layer to apply, need leave standstill after the coating and treat in 3 minutes to vulcanize behind the levelling again.
Embodiment 4
Identical with embodiment 1, the thickness of the coupling agent that distinctive points is to apply is 1um.
Comparative Examples 1
Be not adopt corona treatment with the distinctive points of embodiment 1.
Comparative Examples 2
Be not adopt coupling agent with the distinctive points of embodiment 1.
Comparative Examples 3
Adopt that thickness is the PC substrate of 200um among the embodiment 1, this PC substrate is put into mould, hot pressing temperature is 110 ℃, pressure 25Mpa, time 90s, and hot pressing one layer thickness is the liquid-state silicon gel of 200um, and described liquid-state silicon gel is with the liquid-state silicon gel among the embodiment 1.Mould and die accuracy is 70um.
Embodiment 1-4 and Comparative Examples 1-3 are tested, and test result is as shown in table 1:
Table 1
| Production code member | Uniformity test | Peel off test | The distortion situation of product is observed |
| Embodiment 1 | 9um | OK | There is not distortion |
| Embodiment 2 | 10um | OK | There is not distortion |
| Embodiment 3 | 13um | OK | There is not distortion |
| Embodiment 4 | 12um | OK | There is not distortion |
| Comparative Examples 1 | 8um | NG | There is not distortion |
| Comparative Examples 2 | 9um | NG | There is not distortion |
| Comparative Examples 3 | 84um | NG | The PC substrate curls |
From the test result of table 1; Can find out, adopt in the composite-key of Merlon and silica gel of method of the present invention preparation, the thickness homogeneous and controllable of silica gel layer and do not adopt mould to carry out hot pressing; Therefore there is not the harmful effect of hot compression deformation for polycarbonate substrate; Lower to equipment requirements, need not adopt the higher mould of quiet density, be fit to large-scale industrial production.
Claims (8)
1. the composite-key preparation method of Merlon and silica gel comprises the steps:
(1) polycarbonate substrate is carried out corona treatment;
(2) coated with coupling agent and dry on the polycarbonate substrate after the corona treatment;
(3) be coated with apply liquid-state silicon gel on the polycarbonate substrate of coupling agent, sulfuration obtains the composite-key of Merlon and silica gel.
2. described preparation method of claim 1, it is characterized in that: the condition of said corona treatment is 2～5 kilowatts, the processing time is 1～5 second.
3. described preparation method of claim 1; It is characterized in that: the method that applies coupling agent in the said step (2) is that a kind of mode in coating, silk screen printing, the spraying applies coupling agent at polycarbonate substrate; Drying obtains being covered with the polycarbonate substrate of coupling agent.
4. described preparation method of claim 1; It is characterized in that: said coupling agent is a silane coupler; Described silane coupler is selected from γ-An Bingjisanjiayangjiguiwan, VTES, vinyltrimethoxy silane, γ-chloropropyl triethoxysilane, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide, anilinomethyl triethoxysilane, N-β (aminoethyl)-γ-An Bingjisanjiayangjiguiwan, N-β (aminoethyl)-γ-aminopropyl methyl dimethoxysilane, γ-(2; 3-epoxy third oxygen) a kind of in propyl trimethoxy silicane, γ-(methacryloxypropyl) oxypropyl trimethyl silane, γ-Qiu Jibingjisanjiayangjiguiwan, γ-sulfydryl propyl-triethoxysilicane, γ-(3, the 4-epoxycyclohexyl) ethyl trimethoxy silane.
5. described preparation method of claim 1, it is characterized in that: the thickness of said coated with coupling agent is 0.5～1um.
6. described preparation method of claim 1, it is characterized in that: the condition of said sulfuration is 130 ℃～150 ℃ of curing temperatures, cure time 10～20 minutes.
7. described preparation method of claim 1 is characterized in that: said liquid-state silicon gel is two components, and shore hardness is 50～80 liquid-state silicon gel.
8. described preparation method of claim 1 is characterized in that: the method that applies liquid-state silicon gel in the said step (3) is: adopt a kind of silica gel that on polycarbonate substrate, is coated with in I-shaped spreader, the line rod spreader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102178427A CN101740242B (en) | 2008-11-21 | 2008-11-21 | Method for preparing polycarbonate and silica gel composite key |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102178427A CN101740242B (en) | 2008-11-21 | 2008-11-21 | Method for preparing polycarbonate and silica gel composite key |
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| Publication Number | Publication Date |
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| CN101740242A CN101740242A (en) | 2010-06-16 |
| CN101740242B true CN101740242B (en) | 2012-03-28 |
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| CN2008102178427A Expired - Fee Related CN101740242B (en) | 2008-11-21 | 2008-11-21 | Method for preparing polycarbonate and silica gel composite key |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084190A (en) * | 1992-08-31 | 1994-03-23 | 陶氏康宁公司 | Deformable, abrasion-resistant coating and manufacture method thereof |
| CN1124403A (en) * | 1994-04-26 | 1996-06-12 | 信越聚合物株式会社 | Push button switch covering member of silicone rubber with protective coating and method for the preparation thereof |
| US6224278B1 (en) * | 1997-11-11 | 2001-05-01 | Polymatech Co., Ltd. | Key pad with rigid key top having both silicone and urethane adhesion layers |
| US6322875B1 (en) * | 1997-04-15 | 2001-11-27 | Polymatech Co., Ltd. | Transparent decoration key top and its manufacturing method |
| CN1721488A (en) * | 2004-07-13 | 2006-01-18 | 闳晖实业股份有限公司 | Surface bonding method for polyester film sheet and silica gel push-key and products |
-
2008
- 2008-11-21 CN CN2008102178427A patent/CN101740242B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084190A (en) * | 1992-08-31 | 1994-03-23 | 陶氏康宁公司 | Deformable, abrasion-resistant coating and manufacture method thereof |
| CN1124403A (en) * | 1994-04-26 | 1996-06-12 | 信越聚合物株式会社 | Push button switch covering member of silicone rubber with protective coating and method for the preparation thereof |
| US6322875B1 (en) * | 1997-04-15 | 2001-11-27 | Polymatech Co., Ltd. | Transparent decoration key top and its manufacturing method |
| US6224278B1 (en) * | 1997-11-11 | 2001-05-01 | Polymatech Co., Ltd. | Key pad with rigid key top having both silicone and urethane adhesion layers |
| CN1721488A (en) * | 2004-07-13 | 2006-01-18 | 闳晖实业股份有限公司 | Surface bonding method for polyester film sheet and silica gel push-key and products |
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| CN101740242A (en) | 2010-06-16 |
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Effective date of registration: 20170613 Address after: 523287 Guangdong Province, Dongguan City Gaobu Town Village Security Security Wai Industrial Park building A1 on the third floor Patentee after: DONGGUAN HONGJU SILICONE RUBBER PRODUCTS CO.,LTD. Address before: 312365 Zhejiang Province, Shaoxing city Shangyu District Songxia Town City Station International Plaza building 36 unit room 1-101 Patentee before: ZHEJIANG HONGSHENG TECHNOLOGY TRANSFER SERVICES CO.,LTD. Effective date of registration: 20170613 Address after: 312365 Zhejiang Province, Shaoxing city Shangyu District Songxia Town City Station International Plaza building 36 unit room 1-101 Patentee after: ZHEJIANG HONGSHENG TECHNOLOGY TRANSFER SERVICES CO.,LTD. Address before: 518118 Pingshan Road, Pingshan Town, Shenzhen, Guangdong, No. 3001, No. Patentee before: BYD Co.,Ltd. |
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Granted publication date: 20120328 Termination date: 20191121 |
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