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Jun 19, 2024
The weather resistance of modified silicone resin increases with the increase of siloxane content, and is related to the types of siloxanes and organic resins used, as well as the modification methods. For example, modified resin coatings prepared by introducing 30% organic silicone resin into alkyd resin can dry at room temperature and have outdoor exposure performance 2-3 times higher than alkyd coatings. For example, S! - Comparison of aging tests (using ATLASUVCON irradiation) on acrylic modified silicone resin CD and S! - OC bonded alkyd modified silicone resin, polyester modified silicone resin, alkyd resin, and epoxy resin showed that the gloss retention and color difference of the modified resin were significantly better than those before modification or other organic resins, while the weather resistance of CD was better than that of both. The influence of siloxane content on weather resistance in modified resins. Taking room temperature cured alkyd modified silicone resin as an example.
Although the weather resistance of organic resin modified silicone resin is not as good as that of pure silicone resin, adding certain types of silicone resin appropriately to organic resin can significantly improve its weather resistance. The weather resistance of modified silicone resin increases with the increase of siloxane content. If silicone resin containing 50% organic resin still has outstanding weather resistance, adding only 10% of certain silicone resins to alkyd resin can significantly increase the weather resistance of the product. The anti mold and slow corrosion performance of silicone resin coating is also good.
The weather resistance of resins in industry is mainly evaluated through changes in paint film gloss and color change (color difference, change).The simplest method for testing the weather resistance of paint films is to expose the test pieces coated with silicone resin outdoors and observe changes in coating glossiness or color, as well as cracking. Due to variations in the amount of sunlight exposure, temperature changes, rain, snow, wind and frost, free dust in the air, and pollution from various chemical substances received by the test pieces outdoors, it is difficult to establish strict standards, making evaluation and analysis more difficult. In addition, the period of obtaining results is relatively long (in years), so the number of people using this method is gradually decreasing. Nowadays, accelerated aging testing machines are more commonly used to obtain weather resistance data.
Under accelerated test conditions, the glossiness of the coating is maintained at 60%, the alkyd resin coating is maintained for 250 hours, the alkyd resin coating containing 30% (mass fraction) siloxane is maintained for 750 hours, and the alkyd resin coating containing 50% (mass fraction) siloxane is maintained for 2000 hours. However, after 3000 hours of pure siloxane coating, the glossiness retention rate is still higher than 80%.