A small experimental device for solid phase polymerization

Abstract

The invention relates to a small solid-phase polymerization experimental facility. The small solid-phase polymerization experimental facility comprises a heat conducting oil pool (13) and a reactor (7), and an electrical heating rod (6) is inserted into the heat conducting oil pool (13) for heating the heat conducting oil (12) injected into the heat conducting oil pool (13). The small solid-phase polymerization experimental facility is characterized in that the reactor (7) is inserted into the heat conducting oil (12) through an opening in a sealing cover of the heat conducting oil pool (13), a micro bin (9) is mounted in the reactor (7), a nitrogen coil pipe (10) is coiled around the reactor (7), a nitrogen inlet end is connected with a nitrogen source, nitrogen is heated by virtue of the heat conducting oil (12), then enters into the interior of the reactor from the bottom of the reactor, heats a polyester slice in the micro bin (9) and then is exhausted out from the reactor from an exhaust hole in the upper part of the reactor (7), a first thermocouple (8) used for measuring a reaction temperature in the micro bin (9) is inserted and mounted in the reactor (7), and the first thermocouple is connected with a temperature display (15). The small solid-phase polymerization experimental facility is small in volume and good in temperature uniformity.

Description

technical field [0001] The invention relates to a chemical experiment device, in particular to a polymerization reaction device, in particular to a small solid-phase polymerization experiment device. Background technique [0002] In order to meet the needs of specific physical and mechanical properties and processing properties, it is usually necessary to increase the relative molecular weight of polyester. At present, solid-state polymerization is generally used to prepare polyester chips with higher relative molecular weight. The general method is to heat the polyester chips with lower relative molecular weight obtained by melt polymerization to above the glass transition temperature and below the melting point, and slice them. Further polymerization takes place at this temperature. During the solid-state polymerization process, the small molecules of by-products diffuse out of the chip, and are taken out of the reaction system by vacuum or inert gas, so that the polymeri...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design a small-scale (only 1 -5 grams of polyester chips), which significantly improves the uniformity of reaction temperature, is easy to operate, and can simulate a small solid-phase polymerization experimental device for fluidized bed reactions.

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