According to National Food Safety Standard – Standard for Uses of Food Additives (GB2760-2014), sodium benzoate and potassium sorbate are not permitted to be used in ice cream applications.
Kindly refer to the attachment below.
Remark: Sodium benzoate is permitted to be used as a preservative in flavored ice or ice bar products with a maximum level of 1.0g/kg (measured as per benzoic acid).
National Health and Family Planning Commission of the People’s Republic of China. (2014). National Food Safety Standard – Standard for Uses of Food Additives (GB2760-2014).