Di-tert-butyl peroxide, also known as DTBP, is the most commonly commercialized dialkyl peroxide with the molecular formula C8H18O2. It is a colorless liquid that can be mixed with organic solvents such as benzene and petroleum ether, and is insoluble in water. It is mainly used as a resin initiator, photopolymerization sensitizer, rubber vulcanizer, diesel ignition promoter, and also in organic synthesis.
The main application fields of di-tert-butyl peroxide (this article is the first part), and a brief introduction is as follows:
1、 Crosslinked polyethylene industry
Crosslinked polyethylene (PEX) is a type of polyethylene that converts linear or slightly branched polyethylene (PE) into a two-dimensional or three-dimensional network structure through chemical substances or high-energy radiation. It is widely used in pipes, films, cables and foam products with excellent comprehensive properties.
Compared with metal pipes or other plastic pipes, cross-linked polyethylene pipes have many characteristics and advantages, such as a wide temperature range, long-term use under -75 ℃ -110 ℃ conditions, solid and resilient texture, high internal pressure resistance, good chemical corrosion resistance, rust and mold resistance, light weight, and the ability to bend freely without embrittlement. In recent years, the development of cross-linked polyethylene has been rapid and has broad prospects.
The main application varieties in peroxide crosslinked polyethylene are 2,5-dimethyl-2,5-bis (tert butylperoxy) hexane (also known as 101) and di tert butylperoxide (DTBP), each accounting for approximately 55% and 30% of the total demand, with the addition ratio range between 0.5% and 2%.
2、 Polypropylene fiber industry
Polypropylene, abbreviated as PP, is a thermoplastic resin produced by polymerization of propylene. It has the advantages of low density, non-toxic, easy processing, impact resistance, and good electrical insulation, and is widely used in fields such as fiber processing, automotive industry, household appliances, electronics, packaging, and building materials and furniture.
In recent years, the core material of masks that have caught fire due to the epidemic is polypropylene ultrafine fiber, which is meltblown cloth. Fiber fineness ranging from 0.5 to 1.0 μ m. The random distribution of fibers provides more opportunities for thermal bonding between fibers, resulting in a larger specific surface area and higher porosity (≥ 75%) for melt blown gas filtration materials. After high voltage electret filtration efficiency, the product has the characteristics of low resistance, high efficiency, and high dust tolerance.
The organic peroxides used in the polypropylene fiber industry are mainly dialkyl peroxides, with a general addition ratio of 0.05-0.2%. Among them, 2,5-dimethyl-2,5-bis (tert butylperoxy) hexane (101) accounts for 70%, and Di-tert-butyl peroxide (DTBP) accounts for 20%.