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A kind of ultraviolet curing adhesive and the method for testing release force using the adhesive

A test method and technology of release force, applied in the direction of adhesive type, ester copolymer adhesive, measuring device, etc., can solve problems such as deviation, achieve good wettability, simple test method, close contact effect

Active Publication Date: 2018-12-11
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

[0007] TESA7475 tape is a fully cured tape, which is convenient for testing and sample preparation. However, when OCA optical tape is coated, liquid OCA glue oligomer is poured between light and heavy release films, and the thickness is adjusted. Through UV irradiation, reaction and curing occurs to form OCA adhesive products. In this process, when the liquid OCA adhesive is cured, the silicon layer on the release film will participate in the chemical reaction, which will cause changes in the release force of the release film. Directly use TESA7475 tape to measure There is a large deviation between the obtained release film release force data and the real release force

Method used

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  • A kind of ultraviolet curing adhesive and the method for testing release force using the adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 100 parts of isooctyl acrylate and 1 part of 1-hydroxycyclohexylbenzophenone evenly, and react under ultraviolet light to form an oligomer with a viscosity of 400 mPa·s~500 mPa·s; add 1 - 0.01 part of hydroxycyclohexyl benzophenone, 0.01 part of 1,6-hexanediol diacrylate and 0.01 part of trimethylolpropane triacrylate, stirred for 10 min to 40 min to obtain an adhesive mixture; the obtained adhesive mixture Filter with a 480-mesh filter cloth and vacuumize for 20 to 60 minutes to obtain UV-curable adhesive L; the above-mentioned parts are parts by mass.

Embodiment 2

[0039] The corona-treated side of the substrate is coated with the UV-curable adhesive L obtained in Example 1 to form an adhesive layer with a thickness of 125 μm, and then a release film is attached on the adhesive layer. The release film for measuring the release force is subjected to UV curing treatment, and the amount of UV light is 400 mJ / cm 2 ~800 mJ / cm 2 , the curing time was 8 min, and the test tape L was obtained.

[0040] In this embodiment 2, 6 different release films were used respectively, and these 6 release films are respectively:

[0041] Release film a Kurimura Chemical Co., Ltd. L475

[0042] Release film b SKC Haas RF32N

[0043] Release filmc Kurimura Chemical Co., Ltd. H275

[0044] Release film d Toray Co., Ltd. XD55YR75

[0045] Release film e SKC Haas RF02N

[0046] Release film f Toray Corporation XD5BR.

Embodiment 3

[0048] The test tape L obtained in Example 2 is cut into a strip sample L with a width of 25 mm and a length of not less than 300 mm to ensure that the incision is straight and clean; peel off the release film of one section of the strip sample L to form a strip sample L. The free end of the molded film, a section of the strip sample L that has not peeled off the release film forms a sample test section with a length of not less than 100 mm; the sample test section is firmly fixed on the test board, and a 2 kg standard pressure roller is used Roll the test section of the sample back and forth 3 times to make the UV-curable adhesive L in the strip sample L closely adhere to the base material and the release film; put the free end of the release film into the activity of the tensile tester Jaw, use a tensile tester to perform a 180° peel force test on the release film at a peel speed of 300 mm / min, and the obtained peel force is the release force of the release film.

[0049] Th...

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Abstract

The invention relates to an ultraviolet curable adhesive. The ultraviolet curable adhesive is prepared through the following steps: uniformly mixing 100 parts of isooctyl acrylate with 1 part of 1-hydroxycyclohexyl phenyl ketone, and carrying out a reaction under ultraviolet irradiation to generate oligomer; and adding 0.01-0.2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.01-0.5 parts of 1,6-hexanediol diacrylate and 0.01-0.5 parts of trimethylolpropane triacrylate to the oligome, stirring all above substances for 10-40 min, filtering the obtained product by a 480 mesh filter cloth, and carrying out vacuum pumping for 20-60 min. The invention also relates to a release force test method for testing a release film for OCA optical adhesive tapes by using the adhesive. Practices verify that the method can correctly guide the production control of a production line, and the adhesive used for testing the release force of the release film can well simulate the curing reaction in an OCA curing process, has good wetability due to the liquid state, and can be in close contact with the release film in order to obtain accurate release force data.

Description

technical field [0001] The present invention relates to an adhesive, in particular to a UV-curable adhesive. The present invention also relates to a method for testing release force, in particular to a method for testing release films for OCA optical tapes using the UV-curable adhesive. Force testing method. Background technique [0002] OCA optical tape is a double-sided adhesive tape composed of substrate-free optical acrylic adhesive (OCA adhesive) and a release film attached to its upper and lower layers, because of its high clarity, high optical transparency, and high adhesion. It is widely used in the field of assembly of optical devices such as touch screens, navigators, and mobile phones. [0003] In OCA optical tape, the release film on both sides of the OCA adhesive is divided into light release film and heavy release film according to the release force. [0004] The release film for OCA optical tape needs to have extremely high cleanliness, good flatness and duc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08G01N19/04C08F220/18
CPCC08F220/18C08F220/1808C09J133/08G01N19/04C08F222/102C08F222/103
Inventor 米衡
Owner 新纶电子材料(常州)有限公司
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