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TIB KAT 324 is a commercial name for a bismuth-based polyurethane catalyst produced by TIB Chemicals AG in Germany.
TIB KAT 324 is designed as an alternative to tin-based catalysts (such as DBTDL) for the catalysis of isocyanate reactions, particularly in the production of polyurethanes.
CAS Number: 34364-26-6
Synonyms
Bismuth tris(2-ethylhexanoate),Bismuth(III) neodecanoate,Bismuth carboxylate catalyst
Introduction
Polyurethanes are versatile polymers widely used in foams, coatings, adhesives, sealants, and elastomers.
The synthesis of polyurethanes involves the reaction of isocyanates with polyols, a process catalyzed by various metal-based catalysts to control reaction rates and polymer properties.
Traditionally, tin-based catalysts like dibutyltin dilaurate (DBTDL) have dominated the industry due to their high catalytic efficiency.
However, concerns about the toxicity and environmental impact of organotin compounds have led to increased interest in alternative catalysts.
TIB KAT 324 is a bismuth-based catalyst developed by TIB Chemicals as a low-toxicity, environmentally friendly alternative to tin catalysts.
Bismuth carboxylates like those in TIB KAT 324 provide efficient catalytic activity for polyurethane polymerizations with reduced health risks and better regulatory compliance, making them attractive for both industrial and consumer products.
This article presents a detailed examination of TIB KAT 324, covering its chemical composition, synthesis, catalytic behavior, applications, performance, safety profile, regulatory status, and future outlook.
Chemical Composition and Structure
TIB KAT 324’s active component is primarily bismuth neodecanoate, a bismuth (III) salt of neodecanoic acid.
Bismuth belongs to the group 15 metals and exhibits a stable +3 oxidation state in these compounds. Neodecanoic acid is a branched carboxylic acid derived from petroleum sources, known for producing sterically hindered but soluble metal salts.
Chemical Formula and Structure
Chemical Formula: Bi(C10H19O2)3 (approximate for bismuth neodecanoate)
Molecular Weight: ~713 g/mol (varies depending on formulation)
Structure: The bismuth ion is coordinated by three neodecanoate ligands, forming a coordination complex that is soluble in organic solvents like polyols.
The bismuth center facilitates catalysis by coordinating with isocyanate groups and activating the reaction with polyols.
The steric bulk of the neodecanoate ligands ensures compatibility and solubility in polyurethane formulations.
Synthesis and Production
Industrial Synthesis
Bismuth neodecanoate is synthesized by reacting bismuth oxide (Bi2O3) or bismuth metal with neodecanoic acid under controlled heating and stirring.
The reaction forms bismuth carboxylate salts, which are then purified to remove unreacted acids and impurities.
Formulation of TIB KAT 324
The catalyst is formulated as a solution or dispersion of bismuth neodecanoate in solvents or polyols to facilitate easy dosing into polyurethane systems.
Additives may be included to stabilize the catalyst and optimize shelf life.
Quality Control
Quality parameters include:
Bismuth content (%)
Viscosity
Solubility
Absence of heavy metal contaminants
Consistency of catalytic activity
Catalytic Mechanism
TIB KAT 324 acts as a catalyst by coordinating with the electrophilic isocyanate group, increasing its susceptibility to nucleophilic attack by the hydroxyl groups of polyols.
The bismuth center serves as a Lewis acid, enhancing the rate of urethane bond formation.
Comparison to Tin Catalysts
Organotin catalysts typically act through Lewis acid activation but have higher toxicity.
Bismuth catalysts offer comparable catalytic efficiency but with reduced environmental and health concerns.
The steric hindrance around the bismuth ion modulates activity, leading to controlled reaction rates beneficial for foam and elastomer properties.
Physicochemical Properties
Physical State: Typically a clear to pale yellow liquid or viscous solution.
Solubility: Soluble in common polyurethane polyols, organic solvents.
Thermal Stability: Stable up to approximately 150–200 °C under inert atmosphere.
pH: Neutral to slightly acidic in solution.
Density: Approx. 1.0 – 1.1 g/cm³ depending on formulation.
Compatibility with various polyurethane components allows versatile use across formulations.
Applications
Polyurethane Foams
Flexible Foams: Used in furniture, automotive seating.
Rigid Foams: Insulation panels, refrigeration.
Elastomers
Used in footwear, gaskets, seals due to improved mechanical properties.
Coatings and Adhesives
Provides catalysis for moisture-cured coatings and adhesives with reduced VOC emissions.
Specialty Applications
Medical devices and electronics where low toxicity and regulatory compliance are critical.
Performance Characteristics
Catalytic Efficiency: Comparable or superior to DBTDL in certain formulations.
Reaction Kinetics: Controls gelation and cream times for optimal foam formation.
Foam Properties: Produces fine cell structure, good mechanical strength, and resilience.
The catalyst can be fine-tuned by adjusting loading levels and formulation components.
SAFETY INFORMATION ABOUT TIB KAT 324
First aid measures:
Description of first aid measures:
General advice:
Consult a physician.
Show this safety data sheet to the doctor in attendance.
Move out of dangerous area:
If inhaled:
If breathed in, move person into fresh air.
If not breathing, give artificial respiration.
Consult a physician.
In case of skin contact:
Take off contaminated clothing and shoes immediately.
Wash off with soap and plenty of water.
Consult a physician.
In case of eye contact:
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Continue rinsing eyes during transport to hospital.
If swallowed:
Do NOT induce vomiting.
Never give anything by mouth to an unconscious person.
Rinse mouth with water.
Consult a physician.
Firefighting measures:
Extinguishing media:
Suitable extinguishing media:
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas
Advice for firefighters:
Wear self-contained breathing apparatus for firefighting if necessary.
Accidental release measures:
Personal precautions, protective equipment and emergency procedures
Use personal protective equipment.
Avoid breathing vapours, mist or gas.
Evacuate personnel to safe areas.
Environmental precautions:
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Methods and materials for containment and cleaning up:
Soak up with inert absorbent material and dispose of as hazardous waste.
Keep in suitable, closed containers for disposal.
Handling and storage:
Precautions for safe handling:
Avoid inhalation of vapour or mist.
Conditions for safe storage, including any incompatibilities:
Keep container tightly closed in a dry and well-ventilated place.
Containers which are opened must be carefully resealed and kept upright to prevent leakage.
Storage class (TRGS 510): 8A: Combustible, corrosive hazardous materials
Exposure controls/personal protection:
Control parameters:
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls:
Appropriate engineering controls:
Handle in accordance with good industrial hygiene and safety practice.
Wash hands before breaks and at the end of workday.
Personal protective equipment:
Eye/face protection:
Tightly fitting safety goggles.
Faceshield (8-inch minimum).
Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection:
Handle with gloves.
Gloves must be inspected prior to use.
Use proper glove
removal technique (without touching glove's outer surface) to avoid skin contact with this product.
Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
Wash and dry hands.
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
Splash contact
Material: Nitrile rubber
Minimum layer thickness: 0.11 mm
Break through time: 480 min
Material tested:Dermatril (KCL 740 / Aldrich Z677272, Size M)
It should not be construed as offering an approval for any specific use scenario.
Body Protection:
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection:
Where risk assessment shows air-purifying respirators are appropriate use a fullface respirator with multi-purpose combination (US) or type ABEK (EN 14387) respirator cartridges as a backup to engineering controls.
If the respirator is the sole means of protection, use a full-face supplied air respirator.
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so.
Do not let product enter drains.
Discharge into the environment must be avoided.
Stability and reactivity:
Chemical stability:
Stable under recommended storage conditions.
Incompatible materials:
Strong oxidizing agents:
Hazardous decomposition products:
Hazardous decomposition products formed under fire conditions.
Carbon oxides, Nitrogen oxides (NOx), Hydrogen chloride gas.
Disposal considerations:
Waste treatment methods:
Product:
Offer surplus and non-recyclable solutions to a licensed disposal company.
Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging:
Dispose of as unused product
