TEDA A33 Catalyst A33/polyurethane Catalyst A33 Amine A33

Overview

TEDA A33 is the trade name for a widely used tertiary amine catalyst, whose chemical name is 1,4-Diazabicyclo[2.2.2]octane. Its CAS Registry Number is 280-57-9. It is an extremely efficient and versatile catalyst, primarily known for its role in the production of polyurethane (PU) foam.

It is a solid compound with a unique, cage-like molecular structure (a bicyclic diamine), which gives it high stability and catalytic activity.

Key Identifiers

• Common Name: TEDA A33

• Chemical Name: 1,4-Diazabicyclo[2.2.2]octane

• IUPAC Name: 1,4-Diazabicyclo[2.2.2]octane

• CAS Number: 280-57-9

• Molecular Formula: C₆H₁₂N₂

• Appearance: White to off-white crystalline solid or powder.

• Odor: Characteristic amine-like odor.

Primary Function: Catalysis

TEDA A33 is a gelling catalyst in polyurethane chemistry. It primarily accelerates the isocyanate-polyol reaction (also known as the gel reaction).

• Gel Reaction: This is the reaction between a polyol and an isocyanate (like MDI or TDI) that forms the polyurethane polymer network, giving the foam its structural integrity and strength.

• Balanced Catalysis: In many foam formulations, TEDA A33 is used alongside blowing catalysts (like bis-(2-dimethylaminoethyl) ether, often called A-1). The blowing catalyst accelerates the isocyanate-water reaction, which produces CO₂ gas to blow the foam. TEDA A33 ensures the polymer structure forms at the right rate to trap this gas, creating a uniform, stable cell structure.

Main Applications

1. Flexible Polyurethane Foam:

• Slabstock Foam: Used in furniture, mattresses, and carpet underlay. TEDA A33 is crucial for achieving a good "rise profile" and preventing foam collapse.

• Molded Foam: Used in automotive seats, headrests, and armrests.

2. Rigid Polyurethane Foam:

• Used in insulation for appliances (refrigerators, water heaters) and construction panels (spray foam, boardstock). It helps create a fine, closed-cell structure essential for high thermal insulation properties.

3. Other Applications:

• As a catalyst for other chemical reactions beyond polyurethane, such as in organic synthesis.

• As a stabilizer or catalyst in the production of silicones and epoxy resins.

Key Properties and Advantages

• High Efficiency: Very active at low concentrations.

• Balanced Reactivity: Excellent at promoting the gelling reaction, which is vital for achieving the correct foam physical properties.

• Low Odor (Relative): Compared to some other amine catalysts like triethylenediamine (TEDA is actually the same compound), the A33 grade is often considered to have a lower odor impact in the final product.

• Stability: The symmetric, cage-like structure makes it thermally stable and less volatile than many liquid amines.

Handling and Safety (Important!)

TEDA A33 is a hazardous chemical and must be handled with care.

• Health Hazards:

• Irritation: Causes severe skin irritation and serious eye damage. Eye contact can lead to corneal injury.

• Respiratory Irritation: Dust can cause irritation of the respiratory tract.

• Sensitization: May cause an allergic skin reaction.

• Personal Protective Equipment (PPE):

• Eye/Face Protection: Tightly fitting safety goggles or face shield.

• Skin Protection: Wear impermeable gloves (e.g., nitrile rubber), and protective clothing to prevent skin contact.

• Respiratory Protection: Use in a well-ventilated area. If ventilation is insufficient, use a dust respirator.

• Storage: Store in a cool, dry, well-ventilated place in a tightly closed container. Keep away from strong acids, strong oxidizers, and moisture.

Why is it Called "A33"?

The "A33" designation is a product code from its original manufacturer, Evonik's Air Products (now owned by Evonik). It has become the industry-standard name for this specific form and grade of triethylenediamine. The number helps differentiate it from other catalyst products in their portfolio.

Summary

In conclusion, TEDA A33 (CAS 280-57-9) is a fundamental and indispensable workhorse catalyst in the global polyurethane industry, valued for its efficiency and ability to produce high-quality foam products.

Product usage:

the active ingredient of polyurethane catalyst a33 is triethylene diamine, the solution prepared by 33% of triethylene diamine and 67% of monoconjugated dipropylene glycol is mainly used as gel catalyst for polyurethane foam, which is widely used in flexible, semi-rigid, rigid polyurethane foam, coating, elastomer, in polyurethane foaming system, isocyanate firstly reacts with triethylene diamine to generate active complex. the nature of the complex is very unstable, once the urethane bond is generated, it will be free, which is conducive to further catalyzing, triethylenediamine has a strong catalytic effect on the gel reaction and foaming reaction, especially on the polyurethane and hydroxyl catalytic effect is more selective.a33 is mainly used as gel catalyst for polyurethane foams, and it is widely used in flexible, semi-rigid, rigid polyurethane foams, elastomers, coatings, etc.

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storage and transportation:

should be kept sealed and stored in a dry, cool and ventilated warehouse

Packing:

200kg/drum storage: it is recommended to store in dry and cool area with proper ventilation. please fasten the packaging cover as soon as possible after the original packaging to prevent the mixing of other substances such as moisture and other substances that may affect the performance of the product. store in a cool and dry place, keep the container sealed and avoid contact with oxides. do not inhale dust and avoid contact with skin and mucous membranes. smoking, eating and drinking are prohibited in the workplace. after work, shower and change clothes. store contaminated clothing separately and wash before use. maintain good hygiene practices.