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.

2,2'-氧双-（（5,5-二甲基-1,3,2，-二氧杂膦基-2,2'-二硫化物）（5060）和9,10-二氢-9-氧杂-10-膦菲10环氧（DOPO）由于其出色的防火性能和环保特性而被广泛用于聚合物的阻燃整理中。在这项工作中，在超临界CO _2中不同温度下，在16至24 MPa的压力下测量了5060和DOPO的溶解度。随着系统压力和温度的升高，5060和DOPO的溶解度增加，在相同的超临界CO _2下，DOPO的溶解度比5060高。流体条件。此外，使用五个半经验模型，即Chrastil方程，Mendez-Santiago-Teja方程，Kumar-Johnston方程，Garlapati-Madras方程以及Sung-Shim方程，来关联阻燃剂的实验溶解度。结果表明，Sung-Shim模型具有更好的拟合效果，其中5060的AARD值为21.5％，DOPO的AARD值为12.2％。此外，还使用5060和DOPO进行了实验，以确定在超临界CO _2中进行阻燃整理的可行性。