The need to develop water-based adhesives to replace oil-soluble adhesives

Braun tubes are made of glass and maintain a vacuum inside, so they are easily damaged by external forces applied to them. Therefore, the Braun tube cannot be fixed directly into a box or shell. Instead, an explosion-proof tape made of the whole plant adheres to the outer perimeter of the Braus tube, and then the explosion-proof tape is fixed to the box or shell.

If the explosion-proof tape is secured to the Braun tube by means of cushioning tape, it is possible to prevent damage to the Braun tube in the event of an internal explosion caused by external force or accident and to minimize the area of debris scattering. The demand for Braun tubes has been increasing due to the rapidly developing information technology market which demands better display media. In particular, the size and quality of Braun tubes used in traditional TV sets are increasing, and expensive color Braun tubes with high resolution and flat panel displays have been developed for the next generation of computer monitors, super large screen color TV sets, and high definition TV (daily DTV).

Before the Brawstube is marketed as a final product, it goes through many assembly steps and rigorous testing procedures. In the final test after completion of assembly, defective parts that do not provide satisfactory performance due to defects or errors in the assembly process are eliminated.

In this case, the final product was so defective that it had to be disassembled so that the problem could be fixed and then reassembled for the market. During the disassembly process, the tape attached to the Braun tube for explosion protection must be removed. However, because the adhesive layer is formed during heat treatment at temperatures above 200℃ for 30 to 40 minutes in the Braun tube assembly process, the tape is usually firmly attached to the Braun tube, making its removal quite difficult. Up to now, the removal of the adhesive layer during the disassembly process has been carried out either by organic solvent lysis or by physical force. However, these methods take a long time and may cause other problems, such as environmental pollution and damage to the periphery of the Brauer tube. These problems are particularly acute for tape prepared with an oil-soluble adhesive. The explosion-proof tape used to secure Braun tubes consists of an adhesive and a tape base material.

Widely used as adhesives, oil-soluble acrylic adhesives have the advantages of low price, excellent adhesion, and a simple production process. However, the use of oil-soluble propionic acid adhesives is regulated in developed countries due to the risk of fire or toxic volatile vapors and environmental pollution in their production and reproduction processes.

Therefore, it is necessary to develop water-based adhesives to replace oil-soluble adhesives and make them have better performance and reasonable prices compared with oil-soluble adhesives.