Di-n-Butyl Peroxydicarbonate is a peroxydicarbonate organic peroxide used as a thermal radical initiator in polymerization. It is identified by CAS No. 16215-49-9, molecular formula C₁₀H₁₈O₆, and molecular weight 234.28 g/mol.
Selection is mainly based on peroxide assay, active oxygen, half-life temperature, polymerization temperature, residence time and storage requirements.
Key Technical Parameters
|
Parameter |
Value |
|
Molecular Weight |
234.28 g/mol |
|
Theoretical Active Oxygen |
6.83% |
|
Peroxide Assay |
Approx. 50% |
|
Active Oxygen at 50% Assay |
Approx. 3.41% |
|
Half-Life, 10 h |
49°C |
|
Half-Life, 1 h |
65°C |
|
Half-Life, 1 min |
99°C |
|
Maximum Storage Temperature |
-15°C |
|
SADT |
5°C |
|
Emergency Temperature |
-5°C |
|
Control Temperature |
-15°C |
Initiation Profile
Thermal Decomposition
The peroxide decomposes thermally to generate free radicals for polymerization initiation. Its decomposition rate changes with temperature.
Half-Life
The reference half-life is 10 hours at 49°C, 1 hour at 65°C and 1 minute at 99°C. These values help relate initiator behavior to process temperature and reaction time.
Active Oxygen
A 50% peroxide formulation contains approximately 3.41% active oxygen, providing a quantitative basis for initiator dosage calculations.
Polymerization Applications
Ethylene Polymerization
Used in selected ethylene polymerization systems requiring peroxide-based radical initiation.
Vinyl Chloride Polymerization
Applicable to selected vinyl chloride polymerization processes where the decomposition profile matches the operating conditions.
Vinylidene Chloride Polymerization
Used in selected vinylidene chloride polymerization and copolymerization processes.
Process Selection
Temperature Match
Compare the process temperature with the half-life profile to determine whether the decomposition rate fits the intended reaction stage.
Dosage Calculation
Peroxide assay and active oxygen should be considered when calculating the required initiator level.
Residence Time
Reaction residence time should be evaluated together with temperature because both affect peroxide decomposition.
Formulation Options
50% Peroxide Assay
A formulation containing approximately 50% peroxide is referenced for industrial polymerization use.
Liquid Form
The peroxide can be supplied as a controlled solution, allowing defined concentration for process dosing.
Specification Control
Assay, active oxygen and physical properties should conform to the applicable product specification for the supplied formulation.
Storage and Temperature Control
Maximum Storage Temperature
The referenced maximum storage temperature is -15°C.
Control Temperature
The control temperature is -15°C for the referenced formulation.
Storage Period
A referenced technical specification lists a storage stability of 3 months from delivery under the specified storage conditions.
Safety and Handling Data
Temperature Control
Organic peroxide handling requires controlled temperature conditions throughout storage and transportation.
SADT
The reported SADT is 5°C, providing a key reference for thermal safety assessment.
Emergency Temperature
The reported emergency temperature is -5°C and should be incorporated into applicable emergency handling procedures.
Quality Control
Peroxide Assay
Peroxide assay verifies the concentration of active peroxide in the supplied formulation.
Active Oxygen
Active oxygen provides an additional quantitative parameter for batch evaluation.
Physical Inspection
Appearance and other specification items should be checked against the applicable release specification.
Packaging and Supply
Packaging Selection
Packaging should correspond to the formulation, concentration and applicable dangerous-goods requirements.
Batch Traceability
Batch identification links the supplied material with its production and quality documentation.
Shipping Conditions
Temperature-controlled transportation requirements should be confirmed before shipment according to the actual formulation.
Selection Checklist
Confirm these parameters before technical evaluation:
● CAS No. 16215-49-9
● Peroxide assay
● Active oxygen
● Polymerization temperature
● Half-life requirement
● Residence time
● Maximum storage temperature
● Control temperature
● Packaging specification
● SDS and product specification
FAQ
Q: What is Di-n-Butyl Peroxydicarbonate used for?
A: It is used as a thermal radical initiator in selected ethylene, vinyl chloride and vinylidene chloride polymerization processes.
Q: What is the CAS number?
A: The CAS number is 16215-49-9.
Q: What is the molecular weight?
A: The molecular weight is 234.28 g/mol.
Q: What is the typical peroxide assay?
A: The referenced formulation contains approximately 50% peroxide.
Q: What are the half-life temperatures?
A: The reference values are 49°C at 10 hours, 65°C at 1 hour and 99°C at 1 minute.
Q: What is the maximum storage temperature?
A: The referenced maximum storage temperature is -15°C. The applicable condition should be confirmed for the actual formulation.
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