For Dehydration, defoaming masterbatch
1, Desiccant is used for moisture-proof of bottled drugs and food. It ensures the dryness of the content items and prevents the growth of various kinds of miscellaneous mold.
2, Desiccant can be used as general packaging desiccant for moistureproofing.
3, Desiccant can be conveniently placed in the packaging of various kinds of articles (such as instruments, electronic products, leather, shoes, clothing, food, medicine and household appliances, etc.) to prevent the articles from moisture and mold or rust.
PAN (Polyacrylonitrile): py=100·cm
DP PH (Diphenylpicryl hydrazide): py=101a.cm
TCN Q (Tetracyanoquinolinodimethane): py=10-20·cm
The compound of TCN Q and TTF has a p of up to 10-4Q·cm. However, the synthesis and construction of bulk coatings are difficult and costly, and they have not been promoted.
At present, most of the conductive coatings used in large quantities are blended. It is realized by doping with conductive particles, usually by adding a metal conductive agent or a non-metal conductive agent to the base material. The blended conductive coating has low cost, simple synthesis process, and can maintain the physical properties of the base material. Therefore, this method is commonly used to prepare conductive coatings in large-scale industrial production. Blending type is still the main application of conductive coatings.
Conductive agents are also called conductive fillers, and their conductive mechanism is very complicated. The current consensus is that conductive fillers contact each other to form a continuous network chain, and carriers can move on the network chain to make the coating conductive and anti-static. The contact between the filler and the filler is formed when the coating is dried and cured. This contact state can be seen from Figure 11-1.
Before the coating is dried and cured, the base material and the conductive filler exist independently of each other, are discontinuous, and are in an insulating state. After curing and drying, the solvent evaporates, the base resin and the filler are mixed and cured, and they are tightly connected to each other as a whole, wax emulsion type thereby generating electrical conductivity.
This kind of conductive mechanism belongs to the electron transfer type, and the current is formed by free electrons moving in the direction of the applied electric field.
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