用烷基醇Gemini表面活性剂替代烷基酚聚氧乙烯醚合成苯丙乳液

分别用琥珀酸聚乙二醇辛醇双酯磺酸钠(RCS-8),琥珀酸聚乙二醇十二正烷醇双酯磺酸钠(RCS-12)和琥珀酸壬基酚聚氧乙烯(10)醚酯磺酸钠(RCD-NP)为乳化剂合成了苯丙乳液,并进行了乳液表面张力、机械稳定性、粒径和粒径分布等的测试和比较.结果表明,烷基醇Gemini表面活性剂可以取代烷基酚聚氧乙烯醚用于苯丙乳液合成,其结构对合成乳液的性能影响大.采用RCS-8与RCD-NP为乳化剂合成的苯丙乳液其主要理化性能无明显差异,而其凝胶率、机械稳定性、粒径分布等方面优于后者.聚合温度为80℃,引发剂用量为单体质量的1%时,用RCS-8合成的苯丙乳液的粒径最小,粒径分布范围最窄.

Syntheses of Styrene-acrylic Emulsion Using Alkylalcohol Gemini Surfactants to Replace Alkylphenolic Ethoxylates

The syntheses of styrene-acrylic emulsion was carried out,using the following three emulsifiers:the sodium polyethylene-glycol octyl alcohol sufisuccinates(RCS-8),the sodium polyethylene-glycol lauryl alcohol sufisuccinates(RCS-12) and the sodium succinate nonylphenol ethoxylate(RCD-NP) respectively.Their surface tension,mechanical stability,partical size and particle size distributions were determined and compared to others.The results showed that the syntheses of styrene-acrylic emulsion could be used the alkyl-alcohol Gemini surfactants to replace the alkyl-phenol ethoxylates,the structures of emulsifiers had a big effect on the syntheses.The main physicochemical properties of the styrene-acrylic emulsion synthesized by the emulsifiers of RCS-8 and RCD-NP had no obvious difference,but the gel-rate,mechanical stability,and particle size distributions were better than the latter.When the temperature of polymerization was 80 ℃,the amount of initiator was 1% of monomer contents,the partical size of styrene-acrylic emulsion which was synthesized by RCS-8 was the smallest,the partical size distribution was the narrowest.