There are many methods to modify silicone resin, such as changing the organic groups on the side chain, grafting the main chain, etc. These methods can improve the scratch resistance of silicone resin coating. Now, using nanotechnology to modify has a good prospect.
The preparation of resin based nanocomposite coating is helpful to improve the wear resistance of the coating. On the one hand, the resin matrix can be modified. The interaction between resin and nano particles changes the thermodynamic properties of the system, thus forming a special ordered structure. By changing the aggregation structure of the polymer chain, increasing the atomic force between molecules, binding chain movement, and reducing wear, the wear resistance of the coating can be improved. On the other hand, the introduction of nano fillers into the coating system can improve the mechanical strength and surface hardness of the coating.
To improve the abrasion resistance of silicone resin, Huang Chanjuan et al. studied a silicone resin based nano TiB2 TiC composite coating to improve the surface structure of cotton fabric, so as to achieve excellent abrasion resistance of cotton fabric surface. The orthogonal experiment shows that when the ratio of nano filler TiB2 to TiC is 1 ∶ 2 and the ratio of TiB2 to TiC is 4%, the wear resistance of the coating is the best. The wear rate of the coating film decreases with the increase of coating amount. Scanning electron microscope (SEM) shows that the modified film has excellent wear resistance, and it still has certain hydrophobicity after 1500 times of friction.
In addition to being used as a matrix, silicone resin is also widely used as a reinforcement. The researchers of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences prepared super hydrophobic POSS-GO nano sheets by grafting polyhedral oligosilane onto the surface of graphene oxide (GO) through chemical modification, and added the prepared POSS-GO to epoxy resin to study its corrosion protection and tribological properties in simulated seawater. The results show that the hardness, bonding strength and toughness of the epoxy coating are improved in varying degrees after POSS-GO strengthening. After 150 d immersion in simulated seawater, the friction coefficient and wear rate of 0.5% POSS-GO reinforced epoxy composite coating in simulated seawater were the lowest.
In addition to the application of nanotechnology, silicone modified organic resin coatings have also made new progress. Zhang Quanwei et al. prepared high hydroxyl value and toughness polyester resin modified by silicone resin. The results showed that when the ratio of polyester to silicone resin was 2 ∶ 1, the mechanical properties of the modified film were good and the wear resistance was optimal. With the wear-resistant resin as the base material, silicon carbide, etc. as the wear-resistant filler, molybdenum disulfide, etc. as the lubricating filler, a wear-resistant coating with excellent mechanical properties and good corrosion resistance was prepared. When m (silicon carbide) ∶ m (molybdenum disulfide) is 5 ∶ 2, and the color base ratio is 0.7 ∶ 1.0, the wear-resistant performance of the coating film is optimal.
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