CN103820042A - Thermal-melt optical clear adhesive (TOCA) and bonding method - Google Patents
Thermal-melt optical clear adhesive (TOCA) and bonding method Download PDFInfo
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- CN103820042A CN103820042A CN201410068532.9A CN201410068532A CN103820042A CN 103820042 A CN103820042 A CN 103820042A CN 201410068532 A CN201410068532 A CN 201410068532A CN 103820042 A CN103820042 A CN 103820042A
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- adhesive film
- toca
- melt adhesive
- hot melt
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- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a thermal-melt optical clear adhesive (TOCA) and a method. The thermal-melt optical clear adhesive is composed of natural rubber or a thermoplastic elastomer, a plasticizer, an active diluent, an anti-oxidant, a radical initiator and a coupling agent. The thermal-melt optical clear adhesive has better bonding stress and good transmittance, and is easy to eliminate the bubbles, glue-spilling is difficultly generated while heating to melt, and the thermal-melt optical clear adhesive is especially suitable for bonding with a large-size touch screen. The thermal-melt optical clear adhesive is a great breakthrough based on a first generation optical clear adhesive (OCA) and a second generation optical clear adhesive (LOCA), a novel technology and equipment are cooperated, so that the bubble problem generated during a bonding process can be greatly solved, the method has the advantages of high yield, simple process, convenient repair and high production efficiency, so that the thermal-melt optical clear adhesive belongs to the third generation optical clear adhesive.
Description
Technical Field
The invention relates to an Optical transparent Adhesive film and a bonding method thereof, in particular to a Thermosetting Optical Clear Adhesive (TOCA) film and a bonding method thereof.
Background
The development of touch technology greatly facilitates man-machine interaction operation, so that more and more devices have touch operation functions. The demand for touch screens is also increasing.
Touch screens are mainly classified into capacitive type touch screens and resistive type touch screens, the operation of the capacitive type touch screens is more convenient, and the capacitive type touch screens become mainstream touch screens. The touch screen generally comprises 3 layers, namely, protective glass, a touch layer and a display layer from top to bottom in sequence. In order to make the touch screen have better performance, the layers need to be attached together to remove air between the layers, so that the screen has better display performance and operation performance.
The optical transparent adhesive is colorless and transparent, has the light transmittance of over 90 percent, good bonding strength, no yellowing and good bonding property to ITO glass and optical elements, and is widely used in the industry of touch screens. Currently, Optical Clear adhesives are commonly used, such as oca (Optical Clear Adhesive) tapes, which require film coating and film cutting, and Liquid Optical Clear Adhesive (LOCA), which is usually UV-cured at normal or medium temperature. However, both OCA and LOCA have the problem that bubbles are difficult to remove when a touch screen with a larger size (more than 7 inches) is bonded, and the phenomenon of glue overflow is also easy to occur for LOCA.
In the laminating process of the small-size touch screen, process conditions also need to be strictly controlled, experience requirements on operators are high, the existing laminating efficiency and the one-time laminating success rate are greatly limited, the existing one-time laminating yield is only 70-80%, and a large number of unqualified products need to be subjected to complicated reworking treatment.
The invention discloses a thermosetting optical transparent hot melt adhesive film (TOCA), which is a major breakthrough on first-generation optical clear adhesive OCA and second-generation optical clear adhesive LOCA, is matched with a novel process and novel equipment, well solves the problem of bubbles in the laminating process, and has the advantages of high yield, simple manufacturing process, convenient repair and high production efficiency, and belongs to third-generation optical clear adhesive.
Disclosure of Invention
The invention aims to provide a novel thermosetting optically Clear hot melt Adhesive film (TOCA) and a bonding method based on the Adhesive film.
The technical scheme adopted by the invention is as follows:
a thermosetting Optical transparent hot melt Adhesive film (TOCA) comprises the following raw materials:
40-99 parts of natural rubber or thermoplastic elastomer, 0-50 parts of plasticizer, 0-30 parts of reactive diluent, 0-2 parts of antioxidant, 0.1-10 parts of free radical initiator and 0-10 parts of coupling agent; the raw materials of the composition are preferably 60-80 parts of thermoplastic elastomer, 15-30 parts of plasticizer, 10-20 parts of reactive diluent, 0-2 parts of antioxidant, 0.5-5 parts of free radical initiator and 0-4 parts of coupling agent.
The thermoplastic elastomer is selected from butadiene rubber, styrene-butadiene rubber, ethylene propylene diene monomer rubber, butyl rubber, silicon rubber, SBS, SIS, TPU, EVA, TPE, TPR.
The reactive diluent is selected from the group consisting of isobornyl methacrylate, trimethylolpropane trimethacrylate, methoxy tripropylene glycol monoacrylate, methoxy propoxy neopentyl glycol monoacrylate, tripropylene glycol diacrylate, propoxylated glycerol triacrylate, ethoxylated trimethylolpropane triacrylate, methoxy polyethylene glycol (350) monoacrylate.
The coupling agent is selected from organic chromium complex, silanes, titanates and aluminic acid compounds.
A method for attaching a touch screen comprises the following steps:
1) stacking the protective layer, the thermosetting optical transparent hot melt adhesive film (TOCA) and the touch layer in sequence, and vacuumizing to remove air in the protective layer, the TOCA and the touch layer;
2) heating to initially melt the thermosetting optical transparent hot-melt adhesive film and bonding the protective layer and the touch layer together;
3) heating to completely cure the thermosetting optical transparent hot melt adhesive film;
4) and cooling and post-processing to obtain the touch screen.
As a further improvement of the invention, the evacuation is continuously maintained during the process of heating to completely cure the thermosetting type optically clear hot melt adhesive film (TOCA).
As a further improvement of the invention, the melting temperature of the thermosetting optically clear hot melt adhesive film (TOCA) does not exceed 150 ℃.
The invention has the beneficial effects that:
the thermosetting optical transparent hot melt adhesive film (TOCA) has good cohesive force and light transmittance, is easy to remove air bubbles in the adhesive film, is not easy to generate glue overflow when heated and melted, and is particularly suitable for laminating large-size touch screens.
The invention discloses a thermosetting optical transparent hot melt adhesive film (TOCA), which is a major breakthrough on first-generation optical clear adhesive OCA and second-generation optical clear adhesive LOCA, is matched with a novel process and novel equipment, well solves the problem of bubbles in the laminating process, and has the advantages of high yield, simple manufacturing process, convenient repair and high production efficiency, and belongs to third-generation optical clear adhesive.
The laminating method disclosed by the invention is simple to operate, high in laminating success rate, low in experience requirement on operators and easy to master, and the one-time laminating success rate is more than 99% and is nearly 100%. The method is not only suitable for the lamination of the small-size touch screen, but also is particularly suitable for the lamination of the large-size touch screen.
Drawings
Fig. 1 is a photograph of the fitted product.
Detailed Description
A thermosetting Optical transparent hot melt Adhesive film (TOCA) comprises the following raw materials:
40-99 parts of natural rubber or thermoplastic elastomer, 0-50 parts of plasticizer, 0-30 parts of reactive diluent, 0-2 parts of antioxidant, 0.1-10 parts of free radical initiator and 0-10 parts of coupling agent; the raw materials of the composition are preferably 60-80 parts of thermoplastic elastomer, 15-30 parts of plasticizer, 10-20 parts of reactive diluent, 0-2 parts of antioxidant, 0.5-5 parts of free radical initiator and 0-4 parts of coupling agent.
In the thermosetting optically transparent hot melt adhesive film (TOCA), the main material is natural rubber or thermoplastic elastomer, and the film has no viscosity at normal temperature. After heating, the adhesive can be melted and then crosslinked and solidified under the action of a free radical initiator, and the better bonding effect is achieved.
The thermoplastic elastomer is selected from butadiene rubber, styrene-butadiene rubber, ethylene propylene diene monomer rubber, butyl rubber, silicon rubber, SBS, SIS, TPU, EVA, TPE, TPR.
The plasticizer has the functions of improving the processing performance of the adhesive film and improving the flexibility of the adhesive film. Plasticizers commonly used in the art, such as one or more of DEHP, DINP, DNOP, DBP, DMP, DEP, DOP, DIP trioctyl trimellitate, trihexyl trimellitate, tetraester pyromellitate, triisooctyl 1,2, 4-trimellitate, triethyl citrate, acetyl triethyl citrate, tributyl citrate, acetyl tri (2-ethylhexyl) citrate, propylene glycol adipate polyester, propylene glycol sebacate polyester, phthalate polyester, epoxidized soybean oil, epoxidized linseed oil, butyl epoxyoleate, octyl epoxystearate, epoxidized triglyceride, tetrahydroepoxydioctyl epoxyphthalate, dibutyl maleate, dioctyl maleate, polyhydric alcohol acrylate/methacrylate ester, fumarate, itaconate, unsaturated polyester resins, may be used.
The reactive diluent functions to dilute and react with the host material in a hot melt condition for crosslinking. Commonly used reactive diluents are selected from isobornyl methacrylate, trimethylolpropane trimethacrylate, methoxy tripropylene glycol monoacrylate, methoxy propoxy neopentyl glycol monoacrylate, tripropylene glycol diacrylate, propoxylated glycerol triacrylate, ethoxylated trimethylolpropane triacrylate, methoxy polyethylene glycol (350) monoacrylate.
The antioxidant is used for improving the yellowing resistance of the product, and can be one or more of hindered phenol antioxidants and phosphite antioxidants, specifically, can be one or more of compounds such as Irganox 1141, 1010, 1076, 168, BNX1000, diphenylamine, p-phenylenediamine and dihydroquinoline, derivatives or polymers thereof, 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether, pentaerythrityl tetrakis [ beta- (3, 5-tertiary butyl-4-hydroxyphenyl) propionate ], bisdodecane esters, bistetradecanol esters and bisoctadecanol esters, trioctyl, tridecyl esters, tristecanol esters and tristecanol esters.
The function of the free radical initiator is to initiate a correlation reaction, and the free radical initiator can be one or more selected from azobisisobutyronitrile, azobisisoheptonitrile, benzoyl peroxide, dicumyl peroxide, di-tert-butyl peroxide, lauroyl peroxide, tert-butyl hydroperoxide, methyl ethyl ketone peroxide, tert-butyl peroxybenzoate, cyclohexanone peroxide, diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate and dimethyl azobisisobutyrate.
The thermosetting optically transparent hot melt adhesive film (TOCA) can be prepared into a film material by uniformly mixing the raw materials, then mixing, and then extruding through a die or rolling.
A method for attaching a touch screen comprises the following steps:
1) stacking the protective layer, the thermosetting optical transparent hot melt adhesive film (TOCA) and the touch layer in sequence, and vacuumizing to remove air in the protective layer, the TOCA and the touch layer;
2) heating to initially melt the thermosetting optical transparent hot-melt adhesive film and bonding the protective layer and the touch layer together;
3) heating to completely cure the thermosetting optical transparent hot melt adhesive film;
4) and cooling and post-processing to obtain the touch screen.
The present invention will be further described with reference to the following examples.
Example 1
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.35mm in thickness and comprises the following raw materials:
40 parts of natural rubber, 30 parts of plasticizer, 30 parts of reactive diluent, 1 part of antioxidant, 10 parts of free radical initiator and 3 parts of coupling agent;
wherein,
the reactive diluent is prepared from isobornyl methacrylate and methoxy tripropylene glycol monoacrylate according to the weight ratio of 2: 1 of the components of the composition by mass ratio,
the plasticizer consists of DEHP and is made of DEHP,
the antioxidant consists of Irganox 1141,
the free radical initiator consists of tert-butyl peroxybenzoate,
the coupling agent consists of KH 550.
Example 2
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.25mm in thickness and comprises the following raw materials:
60 parts of thermoplastic elastomer, 20 parts of reactive diluent, 15 parts of plasticizer, 0.5 part of antioxidant and 3 parts of free radical initiator;
wherein,
the thermoplastic elastomer is prepared from silicon rubber and TPE according to the weight ratio of 3: 1 of the components of the composition by mass ratio,
the active diluent consists of methoxy polyethylene glycol (350) monoacrylate CD551 and ethoxylated trimethylolpropane triacrylate,
the plasticizer is prepared from DOP and DIP according to the weight ratio of 4: 3 of a component (a) and (b),
the antioxidant is prepared by mixing 1076 and 168 according to the weight ratio of 5: 2 of the components in a mass ratio of,
the free radical initiator consists of dicyclohexyl peroxydicarbonate.
Example 3
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.45mm in thickness and comprises the following raw materials:
70 parts of thermoplastic elastomer, 15 parts of reactive diluent, 15 parts of plasticizer, 0.5 part of free radical initiator and 2 parts of coupling agent;
wherein,
the thermoplastic elastomer is prepared from SBS and SIS according to the weight ratio of 2: 1 of the components of the composition by mass ratio,
the reactive diluent consists of tripropylene glycol diacrylate,
the plasticizer consists of triisooctyl 1,2, 4-trimellitate,
the free radical initiator consists of azobisisobutyronitrile,
the coupling agent consists of KH570 and KH550 halves.
Example 4
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.5mm in thickness and comprises the following raw materials:
80 parts of thermoplastic elastomer, 20 parts of reactive diluent, 2 parts of antioxidant, 3 parts of free radical initiator and 4 parts of coupling agent;
wherein,
the thermoplastic elastomer is prepared from butadiene rubber and TPE according to the weight ratio of 2: 3 of a component (a) and (b),
the reactive diluent is prepared from methoxypropoxypentylglycol monoacrylate and trimethylolpropane trimethacrylate according to the weight ratio of 1: 2 of the components in a mass ratio of,
the antioxidant consists of BNX1000, and the antioxidant consists of BNX1000,
the free radical initiator consists of diisopropyl peroxydicarbonate,
the coupling agent consists of KH 560.
Example 5
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.15mm in thickness and comprises the following raw materials:
99 parts of thermoplastic elastomer, 15 parts of plasticizer, 0.3 part of antioxidant, 0.1 part of free radical initiator and 10 parts of coupling agent;
wherein,
the thermoplastic elastomer is prepared from EVA and TPE according to the following weight ratio of 2: 1 of the components of the composition by mass ratio,
the plasticizer consists of triisooctyl 1,2, 4-trimellitate,
the antioxidant consists of Irganox 1141,
the free radical initiator consists of di-tert-butyl peroxide,
the coupling agent consists of KH 550.
Example 6
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.3mm in thickness and comprises the following raw materials:
thermoplastic thermal elastomer: 90 grams SIS
Plasticizer: 5 g of DOP (dimethyl phthalate) was added,
active diluent: 2 g of isobornyl methacrylate
Antioxidant: 0.5 g Irganox 1141
Free radical initiator: 2 g of BPO;
the preparation method comprises the following steps:
mixing the raw materials uniformly, milling on a three-roller mill, passing through for five times, discharging, putting the rubber sheet into a mold capable of being vacuumized, putting the mold into a flat press, vacuumizing, heating to 80 ℃, and pressing into a film shape.
Attaching:
and placing the cut adhesive film between two touch screen panels (a piece of cover glass and a piece of induction glass), installing a vacuum fixture, vacuumizing, heating, raising the temperature to 140 ℃, preserving the heat for 10 minutes, slowly cooling, and taking the bonded touch screen out of the fixture.
No bubble and no glue overflow are observed by naked eyes, and the detection result shows that the light transmittance of the attached product is equivalent to that of the cover plate glass and the induction glass. A photograph of the fitted product is shown in fig. 1.
Example 7
The thermosetting optical transparent hot melt adhesive film (TOCA) is 0.3mm in thickness and comprises the following raw materials:
thermoplastic thermal elastomer: 98 g EVA
Plasticizer: 4 grams DIP
Active diluent: 2.5 g trimethylolpropane trimethacrylate
Antioxidant: 0.5 g 1010
Free radical initiator: 1.5 g AIBN
The preparation method comprises the following steps:
mixing the raw materials uniformly, milling on a three-roller mill, passing through for five times, discharging, putting the rubber sheet into a mold capable of being vacuumized, putting the mold into a flat press, vacuumizing, heating to 80 ℃, and pressing into a film shape.
Attaching:
and placing the cut adhesive film between two touch screen panels (a piece of cover glass and a piece of induction glass), installing a vacuum fixture, vacuumizing, heating, raising the temperature to 120 ℃, preserving the heat for 10 minutes, slowly cooling, and taking the bonded touch screen out of the fixture.
No bubble and no glue overflow are observed by naked eyes, and the detection result shows that the light transmittance of the attached product is equivalent to that of the cover plate glass and the induction glass.
Claims (8)
1. A heat-curable optically clear hot-melt adhesive film (TOCA), comprising: the thermosetting optical transparent hot melt adhesive film comprises the following raw materials:
40-99 parts of natural rubber or thermoplastic elastomer, 0-50 parts of plasticizer, 0-30 parts of reactive diluent, 0-2 parts of antioxidant, 0.1-10 parts of free radical initiator and 0-10 parts of coupling agent.
2. The heat-curable optically clear hot melt adhesive film (TOCA) according to claim 1, wherein: the thermosetting optical transparent hot melt adhesive film comprises the following raw materials:
60-80 parts of thermoplastic elastomer, 15-30 parts of plasticizer, 10-20 parts of reactive diluent, 0-2 parts of antioxidant, 0.5-5 parts of free radical initiator and 0-4 parts of coupling agent.
3. The heat-curable optically clear hot melt adhesive film (TOCA) according to claim 1 or 2, wherein: the thermoplastic elastomer is selected from butadiene rubber, styrene-butadiene rubber, ethylene propylene diene monomer rubber, butyl rubber, silicon rubber, SBS, SIS, TPU, EVA, TPE and TPR.
4. The heat-curable optically clear hot melt adhesive film (TOCA) according to claim 1 or 2, wherein: the reactive diluent is selected from the group consisting of isobornyl methacrylate, trimethylolpropane trimethacrylate, methoxy tripropylene glycol monoacrylate, methoxy propoxy neopentyl glycol monoacrylate, tripropylene glycol diacrylate, propoxylated glycerol triacrylate, ethoxylated trimethylolpropane triacrylate, methoxy polyethylene glycol (350) monoacrylate.
5. The heat-curable optically clear hot melt adhesive film (TOCA) according to claim 1 or 2, wherein: the coupling agent is selected from organic chromium complexes, silanes, titanates and aluminic acid compounds.
6. A method for attaching a touch screen comprises the following steps:
1) stacking the protective layer, the thermosetting optical transparent hot melt adhesive film (TOCA) and the touch layer in sequence, and vacuumizing to remove air in the protective layer, the TOCA and the touch layer;
2) heating to initially melt the thermosetting optical transparent hot-melt adhesive film and bonding the protective layer and the touch layer together;
3) heating to completely cure the thermosetting optical transparent hot melt adhesive film;
4) and cooling and post-processing to obtain the touch screen.
7. The attaching method according to claim 6, characterized in that: and continuously keeping vacuumizing in the process of heating to completely cure the thermosetting type optical transparent hot melt adhesive film (TOCA).
8. The attaching method according to claim 6 or 7, characterized in that: the melting temperature of the thermosetting type optical transparent hot melt adhesive film (TOCA) is not more than 150 ℃.
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Application publication date: 20140528 |