Views: 1000 Author: Site Editor Publish Time: 2021-07-30 Origin: Site
Silicone resin is an important raw material in our modern chemical industry, it is widely used in our daily life, from our commonly used cosmetics to aerospace field, there are its figure, these are modified products of silicone resin, then modified silicone resin types what?Here is a detailed introduction.
Silicone resin is an important raw material in our modern chemical industry, it is widely used in our daily life, from our commonly used cosmetics to aerospace field, there are its figure, these are modified products of silicone resin, then modified silicone resin types what?Compared with the silicone resin, the modified silicone resin has a stronger adhesion, mainly because TDI is a kind of active monomer of polyurethane. Among the molecules, there are two -NCO active groups. However, due to the influence of steric hinders on the benzene ring, only one -NCO group is involved in the reaction, and the final product contains -NCo group.The strong polarity of the -NCO group makes it easy to form a relatively stable complexing layer with the covered metal, which greatly increases the adhesion between the film layer and the metal.In addition, the existence of urea bond also contributes to the improvement of adhesion.
After coating the modified silicone resin, the salt water corrosion resistance time is prolonged.There are two main reasons, one is the hydrophobic effect of the silicone resin film, and the formation of an isolation layer between the corrosive medium, can effectively prevent the immersion of water molecules;Second, the membrane-NCO group will take precedence over the complexing layer generated by the metal matrix, which will form a basic balance of chemical potential energy with the corrosion environment, and reduce the possibility of chemical or electrochemical corrosion reaction in the system.
The more common modified silicone resins are epoxy modified silicone resin, acrylic modified silicone resin, alkyd modified silicone resin and polyester modified silicone resin four categories.In addition, researchers often use silicone intermediates and other commonly used organic resins to make modified resins, which not only have the advantages of both resins, but also make up for the shortcomings of silicone resins.