TBHQ

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5、 TBHQ PRODUCT IDENTIFICATION CAS NO. 1948-33-0 EINECS NO. 217-752-2 FORMULA (CH3)3CC6H3(OH)2 MOL WT. 166.22 H.S. CODE 2907.29 TOXICITY Oral, rat: LD50: 700 mg/kg SYNONYMS tert-Butyl-1,4-Benzenediol; TBHQ; MTBHQ; 2-tert-Butyl-1,4-benzenediol; DERIVATION CLASSIFICATION PHYSICAL AND CHEMICAL PROPERTIES PHYSICAL STATE white to light tan crystalline powder MELTING POINT 126.5 - 128.5 C BOILING POINT 273 C SOLUBILITY IN WATER NFPA RATINGS Health: 2; Flammability: 1; Reactivity: 0 FLASH POINT 43 C STABILITY Stable under ordinary conditions APPLICATIONS Antioxidant is a substance added in small quantities to hydrocarbons which are susceptible to oxidation, such as rubbers, plastics, foods, and oils to inhibit or slow oxidative processes, while being itself oxidized. Antioxidants work in two different ways. In primary antioxidants (also called free-radical scavengers), antioxidative activity is implemented by the donation of an electron or hydrogen atom to a radical derivative. These antioxidants are usually hindered amines (p-Phenylene diamine, trimethyl dihydroquinolines, alkylated diphenyl amines) or substituted phenolic compounds with one or more bulky functional groups such as a tertiary butyl at 2,6 position commonly. Butylated hydroxytoluene (BHT) is a common example of hindered phenolic antioxidant. The reaction rate, or carbocation stability, in SN1 mechanism is 3° > 2° > 1° > CH3 (no SN1) so, tertiary alkyl moiety exists in lots of phenolic antioxidant compounds. Primary antioxidants are free radical scavengers which combine with peroxy radicals and break autocatalytic cycle. In secondary antioxidants ( also called peroxide decomposers), activity is implemented by the removal of an oxidative catalyst and the consequent prevention of the initiation of oxidation. Examples of peroxide decomposer type of antioxidant are trivalent phosphorous and divalent sulfurcontaining compound such as sulfides, thiodipropionates and organophosphites. Synergistic effect is expected when primary antioxidants are used together with secondary antioxidants as primary antioxidants are not very effective against the degradation by UV oxidation. Sometimes, chelating agents are added to scavenge metal impurities which can initiate decomposition.

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hangzhou wan jing new material co.,ltd

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