Tert-amyl p-hydroxybenzoate (TAPB) 4511-39-1

Tert-Amyl Peroxybenzoate
Trade Name: Initiator TAPB
English Name: Tert-Amyl Peroxybenzoate
Chemical Name: Tert-Amyl Peroxybenzoate
Structural Formula:
Molecular Formula: C12H16O3
Molecular Weight: 208.30
Theoretical Active Oxygen Content: 7.68%
Properties: This product is a pale yellow, transparent liquid with a boiling point of 124°C (760 mmHg) and a decomposition temperature of 76–77°C. It can be diluted with a solvent specified by the customer. It is insoluble in water but soluble in most
organic solvents. Its specific gravity (25°C) is 1.036–1.045, and its refractive index (25°C) is 1.495–1.500.
CAS: 4511-39-1
UN No. 3103
Type C liquid organic peroxide; Class 2 dangerous goods packaging.
Major decomposition products: tert-butanol, benzoic acid, methane, acetone, ethane, benzene, etc.
Safety Parameters:
Half-life:
0.1 hour: 139°C
1 hour: 118°C
10 hours: 99°C
Thermal Stability Data:
Self-Accelerating Decomposition Temperature (SADT): 60°C
Critical Temperature (Tem): --
Control Temperature (Tc): --
Storage Temperature (Tsmax): --/20 °C
Activation Energy E (kJ/mol): 147.2
Technical Specifications:
Appearance: Pale yellow transparent liquid
Content: 98% min
Active oxygen: 8.07% min
TBHP: 1000 mg/kg
Inorganic and organic hydrolyzable chlorides: 50 mg/kg
Applications:
1. An excellent medium-temperature initiator for low-density polyethylene (LDPE), commonly used in tubular or batch processes. It can be combined with initiators such as PV (tert-butyl peroxypivalate), OT (tert-butyl peroxy-2-ethylhexanoate
), initiator TBPD (tert-butyl peroxynonanoate), and diisopropylbenzene peroxide to form a composite catalyst system, resulting in improved polymerization performance.
2. In the suspension polymerization of styrene, Initiator C is used in combination with benzoyl peroxide (BPO) and is the most commonly used initiator for styrene or styrene copolymers.
3. In the polymerization of acrylates, using Initiator C in place of azo initiators reduces the toxicity of the resin. It can also be used in the polymerization of vinyl acetate.
4. It serves as a high-temperature curing agent for unsaturated polyesters. This product is widely used in the curing processes of unsaturated polyesters in applications such as fiberglass-reinforced plastics, coatings, and adhesives, including the molding processes of SMC, BMC, and DMC
. This product is the preferred high-temperature curing agent for unsaturated polyesters, delivering ideal curing results for both compression molding and pultrusion. Even better results are achieved when combined with initiators such as BPO, TBPEH, and CH
to form a composite initiator system.
5. It serves as an excellent vulcanizing agent for most rubbers (except isobutylene-based rubbers).
6. When added to oils, it significantly improves their cetane number.
Packaging and Transportation:
Our factory’s standard packaging is 25-kilogram polyethylene bags. We can also supply packaging sizes according to customer requirements; customers may specify these when placing orders.
Storage Precautions:
1. Store in a cool, well-ventilated area at a temperature not exceeding 30°C.
2. Keep away from sources of ignition and heat. Store separately from acids, reducing agents, flammable and combustible materials, and other reducing agents.
3. Lighting and ventilation facilities in the storage area must be explosion-proof, and switches should be located outdoors.
4. Handle with care to prevent damage to packaging and containers. Avoid impact and vibration. Wear appropriate personal protective equipment during repackaging and handling operations.
5. Customers are requested to carefully read our factory’s “Material Safety Data Sheet (MSDS)” when storing, transporting, and using this product.
Product Shelf Life:
When stored and transported in strict accordance with the manufacturer’s instructions, product quality is guaranteed for six months.
Fire Protection:
1. This product may decompose violently when exposed to heat, causing a fierce fire. Small fires involving a small amount of the product should be extinguished immediately using a foam or dry powder fire extinguisher.
2. In the event of a large fire, evacuate immediately to a safe distance and use a water hose to extinguish the flames; notify the fire department for further handling.