Page 240 - 精细化工2019年第9期

第 36 卷第 9 期 精 细 化 工 Vol.36, No.9
201 9 年 9 月 FINE CHEMICALS Sept. 2019

建筑用化学品
改性沥青用丁苯胶乳的粉末化制备及应用

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王永明，申凯华
（大连理工大学 精细化工国家重点实验室，辽宁 大连 116024）

摘要：以高低温复合工艺制备的高固含量（60%）丁苯橡胶乳液为原料，经凝聚法制备出粒径分布均匀（<1 mm）
的粉末丁苯橡胶（PSBR），探讨了其凝聚原理，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%（以胶乳固含量
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。
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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
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70 基质沥青的 47.6 ℃提高到 51.8 ℃，5 ℃延度提高到 100 cm 以上，优于目前丁苯橡胶（SBR）胶粉改性沥
青。
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
中图分类号：TQ333.1 文献标识码：A 文章编号：1003-5214 (2019) 09-1968-08

Synthesis and Application of Powdered Styrene-butadiene
Rubber for Modified Asphalt

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WANG Yong-ming, SHEN Kai-hua
（State Key Laboratory of Fine Chemicals, Department of Polymer Science and Engineering, Dalian University of
Technology, Dalian 116024, Liaoning, China）

Abstract: High solid content (60%) styrene-butadiene rubber emulsion was prepared by high-low
temperature composite process. 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 chlorideas flocculant was 1.3% (based on the solid content of latex, the same
below) and that of magnesium sulfateas coagulant was 2.5%, the PSBR had uniform particle size. The
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prepared PSBR was used to modify 70 matrixasphalt.When the additive content of PSBR was 1% of the
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mass of asphalt, the softening point of the modified asphalt was 51.8 ℃, higher than that of 70
matrixasphalt (47.6 ℃). The modified asphalt prepared in this paper showed 5 ℃ elongation of over 100
cm, better than any market samples of powdered styrene-butadiene rubber in modifying asphalt process.
Key words: styrene-butadiene latex; coagulation method; powdered styrene-butadiene rubber; modified
asphalt; building chemicals

随着中国交通事业的快速发展，高性能橡胶改 烯-丁二烯嵌段共聚物（SBS）因优异的改性效果被
[1]
性沥青的需求十分突出，丁苯橡胶（SBR）与苯乙 广泛应用 。但 SBS 需要无水无氧的苛刻生产条件，

收稿日期：2018-11-06; 定用日期：2019-05-21; DOI: 10.13550/j.jxhg.20180812
作者简介：王永明（1993—），男，硕士生，E-mail：wangyongmingwym@126.com。联系人：申凯华（1967—），男，教授，E-mail：
shen_kh@dlut.edu.cn。