New method for directly synthesizing branched polyethyleneimine from haloethylamine

A polyethylenimine and haloethylamine hydrohalide technology, applied in the field of polymer synthesis, can solve problems such as high corrosion, and achieve the effects of less pollution, high yield and easy availability of raw materials

Active Publication Date: 2022-05-13
SICHUAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

And because of the high corrosiveness of EI, there is no gasket material that can withstand long-term contact with EI without leakage, so EI metering pumps and delivery valves must be sealed without gaskets! This requires specialized equipment to meet the requirement

Method used

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  • New method for directly synthesizing branched polyethyleneimine from haloethylamine
  • New method for directly synthesizing branched polyethyleneimine from haloethylamine
  • New method for directly synthesizing branched polyethyleneimine from haloethylamine

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Embodiment 2

[0032]Embodiment 2 and embodiment 18-22 are that other reaction parameters are constant, and the molar number of alkali used in this table, the result shows that the molar number of optimum alkali is 2, helps to obtain the product of high molecular weight. The molecular weight of the resulting product was significantly reduced when NaOH was added in amounts of 2.2 and 2.5 moles, because the excess base would cause the hydrolysis of 2-haloethylamine to ethanolamine; in stage II, ethanolamine initiates the ring-opening polymerization of ethyleneimine to give product. If there is too much ethanolamine by-product, it will lead to a decrease in the molecular weight of the resulting PEI. When NaOH is insufficient, when reducing to 1.9 as mole number, can cause part chloroethylamine and can not be converted into ethyleneimine monomer, also is unfavorable for the carrying out of reaction; Of course, also can obtain PEI product (PEI 18, table now) 1), the piperazine ring content of th...

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Abstract

The invention discloses a novel method for synthesizing branched polyethyleneimine, which comprises the following process steps and conditions: dissolving 1 mole part of 2-haloethylamine haloid acid salt in water until the mass concentration is 10-50%, adding 1.8-2.3 mole parts of alkali, and reacting for 0-24 hours at the temperature of 5-50 DEG C; then reacting for 12 to 48 hours at the temperature of 50 to 120 DEG C; and carrying out desalination, decompression dehydration, vacuum drying and the like on the obtained mixture to obtain a transparent viscous liquid product. 'Halogen' in the 2-haloethylamine haloid is at least one of chlorine and bromine, and the alkali is at least one of lithium hydroxide, sodium hydroxide and potassium hydroxide.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to a method for preparing polyethyleneimine. Background technique [0002] Polyethyleneimines (PEI for short) is a widely used high-performance material. Its molecular structure contains primary amines, secondary amines, tertiary amines and other groups. It is the polymer with the highest density of amine groups known so far. After protonation, organic polymers with the highest cation density are formed. PEI has important applications in the fields of biomedicine, environmental protection, electronics, and polyurethane foam. [0003] The current production method of PEI is mainly obtained by ring-opening polymerization of ethyleneimine (EI) under acidic conditions. Abroad, only German BASF (BASF) and Japanese Catalyst Chemicals can produce it. The preparation process of monomer EI is relatively complicated. It can be prepared by cyclization with ethanolamine and sulfuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/04
CPCC08G73/0206C08G73/0213
Inventor 谢兴益张文
Owner SICHUAN UNIV
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