Rework glue and application thereof in removing LOCA (liquid optical clear adhesive) residue on rework TP (touch panel)

Abstract

The invention provides rework glue. The rework glue is prepared from components in percentage by mass as follows; 50%-75% of modified vinyl silicone oil, 0%-20% of a chain extender, 1%-5% of a reinforcing agent, 0.1%-25% of hydrogen-containing silicone oil, 0.1%-3% of an aid, 0.001%-0.05% of a catalyst and 0.001%-0.05% of an inhibitor, wherein the modified vinyl silicone oil comprises one of acrylate modified vinyl silicone oil, amino-hydrocarbon modified vinyl silicone oil and carboxy-hydrocarbon modified vinyl silicone oil, and the aid comprises acrylate, methacrylate, primary amino or NH2(CH2CH2NH)y active functional groups. The rework glue has excellent tensile strength and tear strength and has better adhesion with LOCA (liquid optical clear adhesive) residue, the LOCA residue on the surface of a rework TP (touch panel) can be torn in pieces, breakage cannot be caused easily, adhesive residue can be removed, and the rework glue is low in curing temperature, takes shorter curing time and cannot damage the structure of the TP.

Description

technical field [0001] The invention belongs to the field of touch screen rework, and in particular relates to a glue used for removing residual glue on the surface of a touch screen. Background technique [0002] With the rapid development of electronic information industry and communication technology, electronic touch screen (Touch panel, TP) is more and more widely used in various aspects of people's production and life. From the outside to the inside of the touch screen, there are protective panels, touch screens, and display screens, which are generally bonded sequentially by liquid optical adhesive (LOCA). However, during the bonding process, air bubbles, foreign matter or offset often occur, and rework is required. Chinese patent 201510425411.X discloses a rework process after TP full lamination. In this patent, the reworked product is sealed and packaged, then immersed in an ultra-low temperature container filled with liquid nitrogen for soaking and freezing treatm...

AI Technical Summary

Problems solved by technology

However, during the bonding process, air bubbles, foreign objects or offsets often occur, and rework is required

Chinese patent 201510425411.X discloses a rework process after TP full lamination. In this patent, the reworked product is sealed and packaged, then immersed in an ultra-low temperature container filled with liquid nitrogen for soaking and freezing treatment, and then the reworked product is mixed with OCA Or the components connected by LOCA are peeled off, and then use absolute alcohol to remove the residual glue on the surface of each part of the components. However, the ultra-low temperature freezing process is costly and may damage the precise circuits and components in the TP, and the method of removing the residual glue with alcohol There are problems of slow cleaning speed and incomplete glue removal

Chinese patent 201610266957.X discloses a method for reworking the touch panel, which uses a laser to heat the touch panel of the reworked product to reduce the glue strength to a preset threshold, thereby removing the touch panel from the reworked product Removed, but the patent does not deal with the residual glue on the touch panel, which affects the reuse of the touch panel

In fact, the rework process of the touch screen includes two important steps of stripping the components and removing the residual glue. However, so far, there are very few literature reports on the removal of the residual glue.

[0003] Chinese patent 201410475508.7 discloses a method for removing residual glue on the touch screen. In this method, the touch screen component containing OCA residual glue is completely soaked in an aqueous solution of sodium chloride, cooked at a temperature of 80-100°C for 5-30min, and then heated at room temperature There are four problems in this method: (1) high temperature treatment causes changes in the refractive index and display performance of the touch screen, which affects secondary utilization; (2) soaking treatment causes sodium chloride solution to penetrate into the touch screen, Destroy the internal circuit, causing the function of the touch screen to fail; (3) Sodium chloride is an inorganic substance, and solid optical adhesive (OCA) is an organic mixture. The aqueous solution of sodium chloride has limited solubility for the residual glue, and the residual glue cannot be completely removed; (4) When the liquid crystal molecules in the touch screen are boiled at a temperature exceeding 80°C, they are easily damaged and cannot be reused after repairing

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