Silicone Water Repellent and insulating agents are mainly composed of silicone resins. In addition, many chemical industrial products also use silicone resins.
1. Thermal stability
Silicone resin can withstand high temperatures up to 359°C. After matching with other materials, the upper limit even reaches 800°C, which means that silicone has strong oxidation resistance. In addition to high temperatures, silicone resins are also quite resistant to low temperatures, and when the temperature changes, the chemical and physical properties of silicone resins will only change slightly.
2. Low surface tension
Silicone resins have the characteristic of low surface tension because of the low cohesive energy density of the chemical constituent polysiloxane, which leads to small forces between molecules and the molecules are in a highly compliant state. The characteristic of polysiloxane is that the solubility is much lower than that of most compounds, so it also makes the silicone resin not easy to be compatible with other substances.
3. Water resistance and insulation
This is why silicone resins act as insulating water repellents. Because the molecular structure of the silicone resin does not contain polar groups, and the water absorption rate is low, it exhibits excellent hydrophobicity. And because the silicone resin shows good insulating properties at various temperatures, and the chemical properties will not change, it is selected as an insulating agent.
Due to the small force between the silicone resin molecules, only the space is large, so it shows excellent air permeability. And because it can block liquid water but not gaseous water, when silicone resin is used as a coating film, its excellent air permeability is exerted.