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Apr 27, 2023
The intermediate can be obtained by hydrolysis reaction alone with RSiCb or with R-core iCl2 CR as the acceptor and aryl groups in the presence of organic solvents. The production of this type of silicon modified polyester generally involves synthesizing polyester prepolymers containing silyl groups first, and then adding organosilicon intermediates containing silyl groups to the polyester prepolymer. From the perspective of process control, polyester prepolymers can only be added to organic silicon intermediates after reaching a certain stage of reaction. Due to the easy self condensation of organic silicon intermediates containing silicon light groups, the reaction is difficult to control. In fact, there are not many cases where silicon modified polyester is prepared using this type of intermediate system.
Polyester modified silicone resin with different polyols
CD synthesized modified organic silicone resin from trimethylpropanone as raw material. The polyester synthesis of trimethylpropanone 14 7g, 9.02g of isophthalic acid, and 3.97g of adipic acid were added to a 50ml four necked flask. Under nitrogen protection, the mixture was slowly stirred and heated at a rate of 60 ° C/h; Dehydration begins at approximately 180 ° C, and the heating rate is changed to 15 ° C/h. The temperature is raised to 200-210 ° C, and the vacuum dehydration condensation reaction is carried out at this temperature. Xylene can also be added at the same time to aid dehydration, until the acid value drops to 10-13mgKOH/g. Cool down to 150 ° C, add acetyl propylene glycol methyl alcohol, and adjust to 75% solid content of polyester resin.
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