Abstract:

The carboxyl group in graphene oxide (GO) was activated by chemical method, and then GO graft modified triethanolamine oleate (MDLO-GO) was prepared through the reaction of GO and the hydroxyl group at the end of MDLO under certain conditions. Finally, after evenly mixing water, KOH and EDTA, potassium soap, MDLO-GO, emulsifier and defoamer were added in turn to obtain the graphene oxide modified water-based hydraulic support concentrated solution (GO-HDSF). The structure of MDLO-GO was confirmed by infrared spectroscopy and X-ray photoelectron spectroscopy, which proved that GO was successfully grafted to the MDLO molecular chain. The experimental results showed that the viscosity, corrosion resistance and lubricity of GO-HDSF were gradually improved with increasing GO addition. When the mass fraction of GO was 0.004%, the corrosion resistance potential of GO-HDSF increased to 83mV and the current density decreased to 6.5×10^-6A/cm². The maximum without bite load (PB) value of GO-HDSF reached to 481N. The lubricity of GO-HDSF was increased by 11.9% and the corrosion resistance was increased by 97.6% compared with the unmodified concentrated solution. At the same time, the high and low temperature resistance performance was also significantly improved respectively.

Key words: graphene oxide, modification, lubricity, corrosion resistance, concentrated solution

摘要：

通过化学法对氧化石墨烯（GO）中的羧基进行活化，然后在一定条件下使其与油酸三乙醇胺（MDLO）末端的羟基反应，制备GO接枝改性油酸三乙醇胺酯（MDLO-GO）；最后将水、KOH、EDTA混合均匀后再依次加入蓖钾皂、MDLO-GO、乳化剂及消泡剂等，制备得到GO接枝改性半合成液压支架用浓缩液（GO-HDSF）。红外光谱和X射线光电子能谱的测试结果表明GO被成功接枝到MDLO分子链上；此外，其他性能测试结果表明，随GO添加量增多GO-HDSF浓缩液黏度逐渐增大，且耐腐蚀性、润滑性逐渐提高；当GO的添加量为0.004%（质量分数）时，GO-HDSF的耐腐蚀电位增大到83mV，电流密度减小到6.5×10^-6A/cm²；GO-HDSF的最大无卡咬负荷PB值最大达到了481N。相比于未经氧化石墨烯改性的浓缩液，GO-HDSF的润滑性提高了11.9%，防腐蚀性提高了97.6%，同时耐高温、低温性能也显著提高。

关键词: 氧化石墨烯, 改性, 润滑性, 防腐性, 水性浓缩液