Reactive insulation film

(Reactive Barrier Films)

Films containing reactive materials can effectively prevent the diffusion of diffuse substances such as oxygen, water vapor and odors, and can be used in food packaging, disposable diapers, organic light emitting diodes, and the like.

Insulation film is a packaging film that guarantees that the interior is in a vacuum state, and oxygen diffuses through the insulator, keeping the concentration close to zero. After a lag time, the oxygen concentration linearly increases. After a short period of time, a better insulating material will be produced, reducing the oxygen pass rate and increasing the oxygen lag time.

It has long been of concern to change the permeability of insulators. To change the nature of insulators, impermeable substances such as mica and clay must be added to the original polyester film. This article mainly introduces the development of this insulating material. The design of this material is mainly to select the insulating material that can react in the diffusive solution, and the reaction should be paid attention to instantaneously to obtain the best insulating surface. Also consider the type of reagent used to ensure that it is stable inside the insulator. In order to get the most effective insulator. The electro-antibody population greatly enhances the insulation performance, especially when the diffused solvent in the insulator reacts rapidly with the internal groups.

Effect The effect of a reactive soft membrane is sometimes similar to that of a non-porous, non-electrical barrier, and sometimes completely different. If the reaction is reversible and has an equilibrium constant K that allows the diffusing solvent to react with a certain stabilizer, the resulting permeability is the same. If the diffusing solvent reacts with an equal amount of flowing reagent, it will increase by the parameter 1+K. K may be much larger than 1, and often larger than 1,000. Therefore, the increase in appearance volume can become quite difficult. Because this increase in the permeability of the insulating ply membrane is not ideal, the flow agent will be damaged as the permeability increases.

The effect of lag time is just the opposite. If the diffusing agent reacts with a non-flowable agent to produce a non-flowing product, the permeability does not change. Lag time increases by 1+K. Because the value of K can be very large, this increase can greatly help improve the performance of the insulation. If it reacts with the same fluidity agent, the lag time does not change. Therefore, the reversible reaction has a reliable symmetry - the permeability of the fluid reagent increases, and the lag time of the non-flowing reagent increases.

The theoretical results show that reaction with non-flowing reagents enhances the insulating properties, but does not react with flowable reagents. This increase in insulation performance is manifested by an increase in the lag time. More fluid reagents increase latency but do not have much effect on the stability of the permeation state. Increasing the thickness of the film by two times reduces the permeability to half, but the lag time is increased by a factor of four. The situation of reactive and non-resistive substances is similar.
The author placed a fence between the heat treated polyvinyl alcohol (PVOH) film and the gelatinized zinc oxide film. It can be found that the lagged time of the film with zinc oxide filler is greatly extended, but the thickness is not large.

Insulation characteristics are estimated using a cheap organic light-emitting diode which cannot be exposed with an oxygen content of 10-5 mol/m. Therefore, low oxygen permeability films such as polyacrylonitrile cannot provide satisfactory results. The addition of 10% non-permeating flakes, 15% linoleic acid, and 50 ppm cobalt catalyst to the polyacrylonitrile film will reduce the steady-state permeability and prolong the damage time. Lag time will increase significantly. If you add more flakes or double the adhesive, the lag time will be further extended.

Conclusions The addition of non-flowable reactive film does not greatly change the film's stable permeability, but it significantly increases the lag time. If the reaction speed is much faster than the diffusion speed, the lag time will increase by more than a thousand times. If this soft film is as uniform as possible and commercialized, it will have high commercial value.