Preparation method of polyether amine

Abstract

The invention relates to a preparation method of polyether amine. In the structure of polyether amine, the main chain is polypropylene oxide, polyethylene oxide, polytetrahydrofuran or a copolymer of polypropylene oxide, polyethylene oxide and polytetrahydrofuran; and one end of the main chain is hydroxyl, and the other end of the main chain is an alcohol amine compound terminated end having a H2N-R-O-H structure. Polyether amine is prepared by the following steps: (1) protecting the amino of the alcohol amine compound by using BOC (tertbutyloxycarbonyl) and maintaining hydroxyl to obtain BOC-NH-R-OH; (2) in the catalysis of strong base or double-metal cyanide, by using BOC-NH-R-OH, initiating polyethylene oxide, polypropylene oxide, tetrahydrofuran or the mixture of polyethylene oxide, polypropylene oxide and tetrahydrofuran to react for ring opening polymerization; and (3) under the acidic condition, carrying out BOC deprotection reaction to obtain polyether amine. According to the invention, polyether main chains having different hydrophilic properties can be obtained by regulating the ratio of polypropylene oxide to polyethylene oxide to polytetrahydrofuran in the polyether chain; and one end of the polyether chain contains the amino, thus the amino can provide strong hydrophilic property after acidification. Polyether amine prepared by using the method can be applied to the fields of a surfactant, a flocculant, textile dyeing and finishing auxiliary, electrophoretic paint and the like.

Description

technical field [0001] The invention relates to a preparation method of polyetheramine, in particular to a preparation method of polyetheramine containing an amine group at one end and a hydroxyl group at the other end, and belongs to the technical field of chemical industry. Background technique [0002] Polyether amine is a kind of compound whose main chain contains polyoxyalkylene structure and active functional group is amine group. By choosing different polyoxyalkylene structures, a series of properties such as toughness, viscosity and hydrophilicity of polyetheramine can be adjusted, and the amine group provides the possibility of polyetheramine reacting with various compounds. Due to its special structure, polyetheramine exhibits unique properties in many application fields, and its application range is becoming wider and wider. [0003] Currently disclosed synthetic methods, the method of introducing amine groups at the end of polyether mainly includes three types: ...

AI Technical Summary

Problems solved by technology

Among them, the first two methods have higher requirements on equipment and technology. Compared with them, the third method is easier to realize. However, because the selected amine compounds often contain several amine groups at the same time, or contain hydroxyl groups, carboxyl groups, etc. The group of active hydrogen atoms, so it is difficult to ensure that an amine compound is only connected to one polyether main chain when it is connected to the polyether chain, so choose a suitable amine compound and selectively connect it to the polyether chain , is the key to such methods