For improving the compatibility of oil-based flame retardants and waterborne substrates, Bisphenol A-bis(diphenyl phosphate) (BDP) is used as the dispersed phase, sodium alginate (SA) solution as the continuous phase, and hydrophilic silica as the emulsifier in the preparation of stable oil-in-water (O/W) Pickering emulsions. Then, the emulsions are added into CaCl₂ solution in the atomized form to polymerize the aqueous phase to calcium alginate (CA) and to obtain BDP/SiO₂/CA microcapsules. BDP/SiO₂/CA microcapsules are used as a flame retardant to improve the fire safety of waterborne polyacrylic acid (PAA) coatings. To verify that BDP/SiO₂/CA is successfully prepared, Fourier-transform infrared spectra (FTIR) and scanning electron microscopy (SEM) are used after microencapsulation. The results show that the physical barrier formed by the SiO₂ particle layer has successfully stabilized the BDP in the CA gel network. Subsequently, the flame retardance of PAA with BDP/SiO₂/CA is tested using limiting oxygen index (LOI) test and cone calorimeter(CONE) test. Compared with pure PAA, when BDP/SiO₂/CA (4:6) microcapsules are added at 20 wt %, the LOI of the PAA coating is increased from 18.6% to 28.4%, the peak heat release rate (PHRR) value of that is reduced by 52.66%. The microcapsules endow oily BDP hydrophilicity and good compatibility with waterborne PAA coatings.

中文翻译：

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Pickering乳液聚合微囊化双酚A-双(磷酸二苯酯)及其在水性聚丙烯酸涂料中的应用

为提高油性阻燃剂与水性基材的相容性，以双酚A-双（磷酸二苯酯）（BDP）为分散相，海藻酸钠（SA）溶液为连续相，亲水性二氧化硅为乳化剂。制备稳定的水包油 (O/W) Pickering 乳液。然后，将乳液以雾化形式加入到CaCl ₂溶液中，使水相聚合成海藻酸钙(CA)，得到BDP/SiO ₂ /CA微胶囊。BDP/SiO ₂ /CA 微胶囊用作阻燃剂以提高水性聚丙烯酸 (PAA) 涂料的防火安全性。验证 BDP/SiO ₂/CA成功制备，微囊化后使用傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）。结果表明，SiO ₂颗粒层形成的物理屏障成功地稳定了CA凝胶网络中的BDP。随后，使用极限氧指数（LOI）测试和锥形量热仪（CONE）测试测试了PAA与BDP/SiO ₂ /CA的阻燃性。与纯 PAA 相比，当 BDP/SiO ₂ /CA (4:6) 微胶囊添加量为 20 wt % 时，PAA 涂层的 LOI 从 18.6% 提高到 28.4%，峰值热释放率 (PHRR) 值为减少了 52.66%。微胶囊赋予油性 BDP 亲水性和与水性 PAA 涂料的良好相容性。