SB-2, being developed for use in Shengli, is composed of a fatty acids modified and polyfunctionalities containing anionic surfactant in Na salt form.
SB 2是胜利油田开发的稠油乳化降粘剂，为脂肪酸改性的具有多官能团的钠盐型阴离子表面活性剂。
The modifying elements used in hypoeutectic Al Si alloys, besides Na, there are also Sr, Te, Ba, Sb, K, RE, B, S, etc.
亚共晶铝硅合金的变质元素除钠以外，还有锶、碲、钡、锑、钾、稀土、硼、硫等。其中，应用较多的是含钠和锶的变质剂。
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