稳定剂NH_4H_2PO_4用于胶体Sb_2O_5阻燃剂的制备及稳定作用研究

采用NH4 H2 PO4 为稳定剂 ,以H2 O2 为氧化剂 ,将Sb2 O3 氧化 ,制得胶体Sb2 O5。通过正交实验法优选出最佳制备工艺条件为 :n(H2 O2 ) /n(Sb2 O3 ) =3,m (H2 O) /m(Sb2 O3 ) =3～ 4,m(NH4 H2 PO4 ) /m(Sb2 O3 ) =0 0 5 ,温度 90℃ ,反应 1 5h。该条件下 ,Sb2 O3 转化率达到 98%,制得胶体中w(Sb2 O5) =2 1%,透光率 90 %,胶粒平均粒径为 84nm左右。实验结果表明 :采用NH4 H2 PO4 作为稳定剂 ,可使Sb2 O5粒子稳定存在 1a以上而不发生聚沉。

硼砂作稳定剂时胶体Sb_2O_5制备条件的优化

The technological process of preparation of colloid Sb 2O 5 by oxidation of Sb 2O 3 with hydrogen peroxide using borax as a stabilizer has been investigated. The optimum preparation conditions selected by orthogonal factorization method as follows m (H 2 O)∶ m (Sb 2 O 3 )=7 5∶1, n (H 2 O 2 )∶ n (Sb 2 O 3 )=3∶1, m (Na 2 B 4 O 7 ·10H 2 O)∶ m (Sb 2 O 3 )=1∶10, 95 ℃, 1 5 h. The conversion of Sb 2 O 3 >95%, light transmittance of colloid >85% and the average diameter of Sb 2 O 5 particles was 50 nm. The colloid Sb 2 O 5 prepared was storage stable without coagulation for more than one year.