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Preparation method of OCA (Optical Clear Adhesive)

A technology of optical transparent glue and photoinitiator, which is applied in the direction of adhesives, film/sheet adhesives, film/sheet without carrier, etc. It can solve the problems of long curing cycle, environmental hazards, and long production. Achieve low cost, good aging resistance and rework performance, and good filling ink level difference

Inactive Publication Date: 2018-11-16
新纶电子材料(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent-based thermal curing method has the following disadvantages: First, the optically transparent adhesive produced needs to be cured, and the curing period is long
Second, this method takes a long time to produce optically clear glue with a higher thickness (≥175μm)
Third, the use of solvents in the production process is harmful to the environment
The optically transparent adhesive prepared in this way is too soft, and after laminating the cover glass and the display module, air bubbles may be generated during the aging resistance test due to high temperature and high humidity.

Method used

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  • Preparation method of OCA (Optical Clear Adhesive)
  • Preparation method of OCA (Optical Clear Adhesive)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of an optically transparent glue of the present embodiment comprises the following steps: put the following reagents into a 2000mL three-necked flask equipped with a stirring paddle, a nitrogen inlet and a thermometer: 1160 grams of 2-ethylhexyl acrylate, hydroxyethyl acrylate 290 grams of esters, 40 grams of acrylic acid, 10 grams of lauryl acrylate, 1.5 grams of 1-hydroxycyclohexyl phenyl ketone, and 2 grams of 1-dodecanethiol. After passing high-purity (99.99%) nitrogen through the above device for 1 hour, turn on the 18w ultraviolet lamp and react for 10 minutes to obtain a prepolymer with a viscosity of about 1500 cps. After polymerization, 1.5 grams of 1,6-hexanediol diacrylate, 4.5 grams of styrene, 0.4 grams of 1-dodecanethiol and 1.2 grams of (2,4,6-trimethyl Benzoyl) diphenyl phosphine oxide, fully stirred and mixed for defoaming, and then the resulting mixture was coated on two layers of 75 μm thick silicone resin-treated polyethylene t...

Embodiment 2

[0026] The preparation method of an optically transparent glue of the present embodiment comprises the following steps: putting the following reagents into a 2000mL three-necked flask equipped with a stirring paddle, a nitrogen inlet and a thermometer: 1050 grams of 2-ethylhexyl acrylate, hydroxyethyl acrylate 290 grams of esters, 85 grams of isobornyl acrylate, 75 grams of lauryl acrylate, 1.5 grams of 1-hydroxycyclohexyl phenyl ketone, and 2 grams of 1-dodecanethiol. After passing high-purity (99.99%) nitrogen through the above device for 1 hour, turn on the 18w ultraviolet lamp and react for 10 minutes to obtain a prepolymer with a viscosity of about 1500 cps. After the polymerization reaction, 60 grams of hydroxyethyl acrylate, 4.8 grams of dipentaerythritol pentapropionate, and 1.2 grams of (2,4,6-trimethylbenzoyl) diphenylphosphine oxide were added to the prepolymer, After fully stirring and mixing, defoaming was carried out, and then the resulting mixture was coated on ...

experiment example

[0032] The performance of embodiment 1,2 and comparative example 1,2 is tested, and test method is as follows:

[0033] Dynamic Mechanical Thermal Analysis (DMTA)

[0034] Using an ARES G2 rheometer (available from TA Instruments, New Castle, Delaware, USA) on a PSA using parallel plates with 8 mm diameter plates and a gap of 1.5 mm Geometry performs DMA testing. The tests were performed with a temperature scan rate of 3°C / min at a frequency of 1 Hz and a maximum strain of 20%. Scans were performed from -20°C to 100°C.

[0035] Cut the OCA sample to be equal to the size of the glass substrate, and use a laminating machine to bond the OCA to the glass substrate with a certain ink level difference (close to 40 microns). The ink glass is then laminated to another glass without ink. The two glasses are then laminated using a laminator. At 50°C, 35 N / cm 2 The lamination was performed at a lamination pressure of 1000°C and a pressing time of 5 seconds. After lamination, the l...

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Abstract

The invention discloses a preparation method of an OCA (Optical Clear Adhesive). The preparation method comprises the following steps: step (1), weighing the following components in percentage by mass: 90 to 99 percent of an acrylic prepolymer, 0 to 10 percent of an acrylic monomer, 0.1 to 0.5 percent of a cross-linking agent, 0.1 to 0.5 percent of a photoinitiator and 0.1 to 1 percent of a chaintransfer agent; step (2), putting and stirring the acrylic prepolymer, the acrylic monomer, the cross-linking agent, the photoinitiator and the chain transfer agent in a container, and carrying out primary curing under an ultraviolet lamp after introducing nitrogen, thus obtaining a prepolymer; step (3), defoaming the prepolymer obtained in step (2), coating a PET (Polyethylene Terephthalate) lining sheet, and carrying out secondary curing under the ultraviolet lamp, thus obtaining the OCA. According to the preparation method disclosed by the invention, incompletely cured OCA in low gel fraction can be obtained through once UV curing, and gaps between adhered objects can be effectively wetted and filled, so that the range difference of printing ink can be filled; secondary curing is carried out after adhesion, the dissipation factor value is increased, and a product is more partial to an elastomer, so that good aging resistance and good reworking performance are obtained.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a preparation method of optically transparent adhesives. Background technique [0002] Optically Clear Adhesive (OCA) is a double-sided adhesive tape with optical properties and no substrate. It is mainly used in the bonding of various display components, including mobile handheld devices, netbooks and notebook computers. Optically transparent adhesive is used to bond the cover glass and liquid crystal display module (close to 40 μm) with a certain thickness of ink steps around or around the frame, and with the design requirements, the ink steps of the bonded cover glass tend to be more It is getting thicker and thicker. At the same time, the new technology embeds the touch screen into the display module, so that the optical transparent adhesive needs to be used on two layers that are not easy to deform and have a large gap. Therefore, there is an increasing requirement for OC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/30C09J7/10C09J133/08C08F220/18C08F220/20C08F220/06C08F222/14C08F212/08
CPCC08F212/08C08F220/06C08F220/18C08F220/1808C08F220/20C08F222/14C09J7/10C09J7/30C09J133/066C09J2433/00C08F222/102
Inventor 傅军伟刘章伟
Owner 新纶电子材料(常州)有限公司
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