文章摘要
王永明,申凯华.改性沥青用丁苯胶乳粉末化制备及应用[J].精细化工,2019,36(9):
改性沥青用丁苯胶乳粉末化制备及应用
Synthesis and Application of Powdered Styrene-butadiene Rubber with Styrene-butadiene Latex for Modified Asphalt
投稿时间:2018-11-06  修订日期:2019-05-18
DOI:
中文关键词: 丁苯胶乳  凝聚法  粉末丁苯橡胶  改性沥青  建筑用化学品
英文关键词: styrene-butadiene latex  coagulation method  powder styrene-butadiene rubber (PSBR)  modified asphalt  building chemicals
基金项目:
作者单位E-mail
王永明 大连理工大学 wangyongmingwym@126.com 
申凯华 大连理工大学 shen_kh@dlut.edu.cn 
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中文摘要:
      以丁二烯和苯乙烯为原料,采用高低温复合工艺制备了高固含量(60%)丁苯橡胶乳液,后经凝聚法制备出粒径分布均匀(<1mm)的粉末丁苯橡胶(PSBR),探讨了凝聚原理,并优化了粉末丁苯橡胶的制备工艺。通过偏光显微镜研究了粉末丁苯橡胶形成阶段的形貌变化。结果表明,凝聚阶段的絮凝剂、凝聚剂和隔离剂对PSBR形貌影响最大。复配隔离剂(硬脂酸钠、油酸钠和硅油)的隔离效果最好,使用氯化钠为絮凝剂〔添加量为1.3%(以胶乳质量为基准,下同)〕,硫酸镁为凝聚剂(添加量为2.5%)时,丁苯胶乳成粉效果最佳,呈均匀粒径的粉末状橡胶。使用PSBR改性70#基质沥青,PSBR添加量为1.0%(以沥青的质量为基准,下同)时,改性沥青的软化点由70#基质沥青的47.6℃提高到51.8℃,5℃延度提高到100cm以上,优于目前丁苯橡胶(SBR)胶粉改性沥青。
英文摘要:
      Styrene-butadiene latex with high rubber content was prepared by high-low temperature composite process using butadiene and styrene. Then powdered styrene-butadiene rubber (PSBR) with uniform particle size distribution (<1 mm) was prepared by coagulation method. The coagulation mechanism and preparation technology of powdered styrene-butadiene rubber were investigated. Furthermore, the morphology of the rubber powder was observed by polarized light microscopy. The results showed that the flocculation agent, coagulant and isolating agent in the coagulation stage have the greatest influence on the morphology of PSBR. A mixture of sodium stearate, sodium oleate and simethicone was the best isolating agent. When the addition amount of sodium chloride as flocculant was 1.3% (based on the mass of latex, the same below) and that of magnesium sulfate as coagulant was 2.5%, the PSBR had uniform particle size. The prepared PSBR was used to modify 70# matrix asphalt. When the additive content of PSBR was 1% of the mass of asphalt, the softening point of the modified asphalt was 51.8℃, higher than that of 70# matrix asphalt (47.6℃). The modified asphalt prepared in this paper showed a 5℃elongation of over 100 cm, better than any market samples of powdered styrene-butadiene rubber in modifying asphalt process.
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