Abstract
2,2′-oxybis-(5,5-dimethyl-1,3,2,-dioxaphosphorinane-2,2′-disulfide) (5060) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) are widely used in the flame-retardant finishing of polymers due to their excellent fire protection properties and environmentally friendly characteristics. In this work, solubility of 5060 and DOPO were measured at pressures ranging from 16 to 24 MPa with different temperatures in supercritical CO2. With the rising of system pressure and temperature, the solubility of 5060 and DOPO increase, and DOPO exhibits a higher solubility than 5060 in the same supercritical CO2 fluid conditions. Moreover, five semi-empirical models, namely Chrastil equation, Mendez-Santiago-Teja equation, Kumar-Johnston equation, Garlapati-Madras equation as well as Sung-Shim equation, were used to correlate the experimental solubility of the flame retardants. The results showed that Sung-Shim model presents better fitting effect with the AARD values of 21.5% for 5060 and 12.2% for DOPO. In addition, experiments were also conducted with 5060 and DOPO to determine the feasibility of flame-retardant finishing in supercritical CO2.
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