甲基纤维素对碳纤维分散性研究

Study on the Dispersion of Carbon Fibers by Methyl Cellulose

采用甲基纤维素作为分散剂,通过"分散系数"和"导电率"两项性能指标来评价分散剂对碳纤维分散性的影响,同时研究了碳纤维水泥砂浆(CFRM)28 d抗折强度和抗压强度的变化规律。结果表明:随着甲基纤维素含量的增加,"分散系数"和"导电率"两项指标都变小,抗折强度逐渐增大,抗压强度先减小后增大,说明甲基纤维素对碳纤维的分散效果明显。当分散剂掺量为0.5%时,"分散系数"和"导电率"两项指标同时出现拐点,此外,抗折强度的增加趋于稳定,说明其最佳掺量为0.5%。

Using methyl cellulose as dispersant,dispersion coefficient and resistivity of the test cement mortar was adopted as the main performance indicators in evaluating the impact of dispersant on the dispersion of carbon fiber.Meanwhile the variation of the carbon fiber cement mortar（ CFRM） flexural strength and compressive strength of 28 days were studied. The results indicate that with the increase of the methyl cellulose content,dispersion coefficient and resistivity become smaller,flexural strength increases gradually,compressive strength decreases and then increases,which suggest that methyl cellulose has a great effect on the dispersion of carbon fiber. When the dosage of the dispersant reaches 0. 5%,the two indicators arrive at the inflection point at the same time with a stable increase of flexural strength,which indicate that the optimal dosage of methyl cellulose is 0. 5%.