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.
Supplier
More products from Guangsiyuan®
ZF-10: high-efficiency and low-odor foaming catalyst, typically used in the preparation of low-odor polyurethane foam products
ZR-50: low-odor gel catalyst, providing excellent balance and can be used for polyurethane molded high-resilience foam
Z-131: Reactive low-odor gel amine catalyst compound
Z-130: low odor gel catalyst, balanced gel/foaming
ZR-70: Low odor catalyst for packaging foam and molded foam on vinyl skins Good balance of foaming and gelling
ZR-40 (pentamethyldipropylenediamine): Particularly effective for cold molded high-resilience foam, with a good balance between low-odor gel and foaming Catalyst
LE-310: low-odor reactive gel catalyst applied to large sponges, new low-VOC amine gel catalyst, amine content exceeds 95%
LE-530: Reactive gel catalyst, used in various polyurethane foam products
DPA: low-odor gel catalyst, outstanding balance and versatility provide good fluidity
TAP 1-methyl-4-(2-dimethylaminoethyl)piperazine: excellent trimerization catalyst that improves fluidity
DMDEE (2,2′-dimorpholine diethyl ether): strong foaming catalyst, providing stable prepolymer system
DMAEE: low-density full-water rigid foam and low-density semi-rigid foam
BDMAEE bis-(2-dimethylaminoethyl) ether: efficient foaming catalyst
BDMA (N,N-dimethylbenzylamine): polyurethane rigid foam catalyst, epoxy accelerator
DMEA (N,N’-dimethylethanolamine): Neutralizes acid in some rigid foam systems,
PMDETA (pentamethyldiethylenetriamine): Particularly effective for HCFC/water-foamed hard foam, similar to PC5
