Solid-phase thickening, also known as solid-phase polycondensation, is a polycondensation reaction carried out in a solid state. A polyester prepolymer with a certain molecular weight is heated to a glass transition temperature below its melting point (usually 10-40 ℃ below the melting point), and small molecule products are taken away by vacuum pumping or inert gas protection to continue the polycondensation reaction. Due to the spherical region and effective collision, condensation reactions occur.
The solid-phase viscosity increasing device can adopt a single kettle process according to the production capacity and variety characteristics of users. All crystallization and reactions are completed in a drum reactor, saving investment, occupying less land, and flexible variety replacement.
If a pre crystallization system outside the kettle is selected, it can save the time occupied by raw materials in the drum reactor and increase production output.
The intermittent solid phase viscosity increasing device does not require nitrogen protection throughout the solid phase polycondensation process, making it convenient for users to use and energy-saving.
And it does not add or use any chemical solvents or additives, which has great environmental significance.
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