Industry demand for antistatic silicone pressure sensitive adhesive

As a one-dimensional nanomaterial, carbon nanotubes (CNTS) are light in weight, perfectly connected in a hexagonal structure, and possess many abnormal mechanical, electrical, and chemical properties. In recent years, with the deepening of the research on carbon nanotubes and nanomaterials, their broad application prospects have been constantly shown. In materials science, the length of carbon nanotubes is used as a conductive substance to add to materials. For example, when applied in the silicone pressure-sensitive adhesive protective film system, carbon nanotubes can be used as a conductive material to add the adhesive layer, giving the protective film adhesive layer excellent anti-static and even conductive properties.

However, since the thickness of the silicone layer in most of the pressure-sensitive adhesive protective films is only 5-20μm, obvious black particles can be seen on the adhesive surface after the addition of ordinary carbon nanotubes, which is mainly due to the problem of uneven dispersion of the current carbon nanotubes, and poor compatibility in the silica gel system, easy to produce agglomeration, resulting in visible black particles. Therefore, it is difficult to be applied to silicone pressure-sensitive adhesive systems.

In addition, some carbon nanotubes after treatment and modification, because their system contains P, N, S and other materials easy to lead to the addition of molded silicone does not cure, or its dispersion medium is water resulting in silicone does not cure, or high boiling point organic solvents such as N-methyl pyrrolidone is difficult to boil from the pressure sensitive adhesive system, resulting in its difficult to be applied to silicone pressure sensitive adhesive. According to the industry demand for antistatic organosilicon pressure-sensitive adhesive, it is urgent to develop a new treatment method for organosilicon-modified carbon nanotubes with uniform dispersion and non-agglomeration, using low boiling point organic solvent and not using substances containing P, N, S that inhibit the activity of platinum catalyst.

The technical problem to be solved by the invention is to provide a treatment method of organosilicon modified carbon nanotubes, which can effectively improve the dispersion of carbon nanotubes in organosilicon pressure-sensitive glue, does not affect the curing of molded silicone, good storage stability, applied in the pressure sensitive glue system can greatly improve the rubber surface conductivity of the pressure sensitive glue protective film. In addition, it has little influence on the transmittance and peeling power of the protective film, so as to overcome the shortcomings of the existing dispersion technology of carbon nanotubes and broaden the application field of carbon nanotubes.