期刊
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
卷 39, 期 9, 页码 1280-1284出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2017.1394197
关键词
ATT; nanohybrid PPD; flow improvers; rheology; photomicrography analysis
Nanocomposites of attapulgite (ATT)/ethylene vinyl acetate copolymer (EVA) were prepared with organically modified ATT covering in EVA. Organically modified ATT was prepared using KH550 and organic acid. The effect of nano-hybrid on the flow behavior of model oil containing 15wt% wax was evaluated. The wax crystallization and crystal morphology of the model oil at low temperature were observed by polarizing optical microscopy (POM). The results indicated that the nano-hybrid with long-chain organic acid-modified ATT exhibited a better effect compared with the nano-hybrid with short-chain organic acid-modified ATT, pure EVA. In addition, it is interesting to note that EVA (VA=32%)/stearic acid-modified ATT composite polymeric pour-point depressant (PPD) S-AtPPD(32) provided better cold-flow improvement for the model oil than EVA (VA=32%)-modified nano-SiO2 composite PPD N-SiPPD (32) with a low dose, which resulted in a regular, bar-shaped, and uniform arrangement of wax morphologies. The pour point of the model oil was reduced from 30 degrees C to -1 degrees C when doped at 200ppm S-AtPPD(32). [GRAPHICS] .
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