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Aug 19, 2024
The coating performance of modified polyester powder coating: The silicon containing polyester in organosilicon modified polyester is enriched on the surface, forming a protective layer containing astatine, greatly reducing the surface tension of polyester resin, thereby bringing some excellent characteristics of organosilicon resin and improving the weather resistance and water resistance of its powder coating.Compared to pure polyester resin, a 1% organic silicon mass fraction can reduce the surface tension of the resin from 49.5 to 28 4 mN/m; after 216 hours of medium wave ultraviolet irradiation, the gloss retention rate of the coating increased from 81% to 91% 3%. After the organic silicon content exceeds 5%, the impact resistance of the coating decreases. The content of organosilicon resin has a significant impact on the gloss retention rate of modified polyester.The introduction of organic silicon components with good UV resistance has improved the final gloss retention rate of polyester resin. Experiments have shown that a 1% organic astatine content has the best effect on improving weather resistance, and other basic properties of the coating are also good. After the organic silicon content in modified polyester reaches a certain level, the enrichment of silicon containing polyester on the surface tends to flatten, further increasing the content of organic silicon resin has an impact on the phase and curing properties of modified polyester resin, manifested as a decrease in coating impact resistance and other properties.
In summary, after a small amount of organic silicon modification, the glass transition temperature and melt viscosity of polyester resin slightly decrease, the contact angle between the surface of polyester resin and water increases, and the surface tension decreases. When organosilicon modified polyester is used in powder coatings, the weather resistance of the coating film is improved. When the modified polyester contains 1% organic silicon by mass, the weather resistance improvement effect of the coating is the best and it has good other coating properties.
Polyester resin coatings have excellent physical and mechanical properties, processing performance, and chemical corrosion resistance, such as brightness, fullness, and high hardness, making them the most widely used resin variety in coil coatings. However, they have defects such as poor water resistance, stain resistance, and poor light and color retention.Silicon modified polyester coil coating combines the characteristics of polyester resin and silicone resin, making it widely used. Silicon modified polyester is highly suitable for high weather resistance coatings and meets the high-performance requirements of coil coatings for home appliance boards, which are currently a new growth point for pre coated coils.
The characteristics of the coil coating prepared with it are as follows: excellent durability of CD Has good coating properties such as hardness, wear resistance, and heat resistance Has good rheological properties on the coil coating line High cost When the formula is correct, it has good chemical resistance Curing into a film through condensation reaction mechanism.
Our main products are Methyl MQ Silicone Resin Powder,MQ Methyl Silicone Resin Liquid,MQ Silicone Resin,Synthetic Leather Silicone Resin Modifier,MQ Silicone Resin Powder,Liquid MQ Silicone Resin,Silicone Resin Elastomer Suspension,Vinyl MQ Silicone Resin,Heat Resistance Silicone Resin.