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May 6, 2023
The organic silicon intermediates used in this preparation process are generally some low molecular weight compounds of the organosilicon class. Due to the tendency of low molecular weight silicon with tibia groups to self aggregate at high temperatures, low molecular weight silicon with tibia groups are often selected, such as methyltrimethoxysilicon,methyltriethoxysilicon,dimethyldimethoxysilicon,dimethyldiethoxysilicon,ethyltrimethoxysilicon, ethyltrimethoxysilicon, and propyltrimethoxysilicon Propyltriethoxysilane, cyclohexylmethyldimethoxysilane, phenylmethyldimethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, tetraethoxysilane, etc.
When modifying polyester with the aforementioned low molecular weight silicon fired compounds, attention should be paid to controlling the degree of reaction. Due to its relatively small molecular weight halo and low boiling point, it is prone to volatilization. Temperature control is a key factor. In addition, it is necessary to determine whether low molecular weight silicon can fully react with polyols at a certain temperature or not, as well as the timing of adding polybasic acids. These factors need to be determined through experiments to ensure normal production. Of course, it also includes some organosilicon intermediates with special functional groups, such as Z-6018, which is a cyclic organosilicon intermediate reported in many patent literature. It is a low relative molecular weight active organic silicon intermediate that is terminated with a tibial group at both ends and has phenyl and propyl side groups. It is commonly used in silicon modified polycarbonate powder coatings.
Research has found that the silicon containing polyvinyl acetate in the modified polyester resin is enriched on the surface, greatly reducing the surface tension of the polyester resin and improving the weather resistance of its powder coating film. When only 1% (mass fraction) of the intermediate is added to silicon modified polyester, the synthesized uncoated powder has the best film weather resistance and good other film properties. However, when the mass fraction of organic silicon exceeds 0.5%, the compatibility of the modified polyester resin system deteriorates and the overall performance decreases.
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