Several synthesis methods of triethylenediamine—common solvents and solute catalysts in A33
Solutes in Catalyst A33 and common glycol solvents
As we all know, A33 is a product commonly used in polyurethane catalytic reactions. By definition, it is a 33%triethylenediamine solution with a mass fraction of The solute is triethylenediamine. Because triethylenediamine is solid at room temperature, in order to facilitate operation and use, it is usually dissolved in glycols. The glycols used as solvents generally include DPG, DEG, EG, PG, BDO, DMEA, etc.
Triethylenediamine is also known as 1,4-diazabicyclo[2.2.2]octane, triethylenediamine, triethylenediamine, slightly It has an ammonia smell and very little toxicity. The lethal poisoning dose LD50 for mice is 2g/kg. Its molecular structure has a unique cage-like structure, in which two nitrogen atoms are directly connected to three ethylene groups to form a bimolecular structure, which is very dense and symmetrical. Since the nitrogen atom not only has no other substituents to increase steric hindrance, but also has a pair of very accessible empty electrons, in the catalytic foaming system, after the urethane bond is formed, triethylenediamine will be freed and participate in The next catalytic reaction process. Therefore, although triethylenediamine is not a strong base, it shows extremely high catalytic activity for the reaction of isocyanate groups and active hydrogen compounds. It is estimated that in a water/polyol mixed system, the gel reaction accounts for 80% , accounting for 20% of the foaming reaction.
Several synthesis methods of triethylenediamine
1. High-temperature deamination of polyamine compounds such as ethylenediamine to synthesize triethylenediamine under the action of catalyst-modified zeolite is a process that is currently widely researched and used.
2. Triethylenediamine is synthesized from piperazine and piperazine ethyl derivatives, such as N-hydroxyethylpiperazine, N-aminoethylpiperazine, etc.
3. Hydroxyethylamine compounds are dehydrated to synthesize triethylenediamine. This process uses ethanolamine, diethanolamine, triethanolamine, etc. as raw materials, and reacts with ammonia water, etc. under the catalysis of a catalyst. , the product is obtained through condensation and dehydration
Okay, the above is a little knowledge about A33.
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Dongguan Polyurethane Materials Co., Ltd.
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