回潮率对石英纤维纱织造前后力学性能的影响

Effect of moisture regain on strength of quartz yarns before and after weaving

为研究导致石英纤维纱使用过程中强度下降的主要因素,对石英纤维纵、横截面及形貌进行表征,测试不同回潮率、不同线密度石英纤维纱织造前后拉伸断裂强度,分析织造过程中整经、开口、打纬等对其力学性能的影响,并探究浸润剂对石英纤维纱力学性能的影响。结果表明:石英纤维纱的拉伸断裂强度随回潮率增加而显著下降,其中95 tex石英纤维纱当回潮率为100%时比0%时拉伸强度降幅最大可达41%;95 tex石英纤维纱在1.0%回潮率织造后,其纤维拉伸强度下降高达60.94%;添加浸润剂对纤维纱强度有明显增强效果,390 tex石英纤维纱添加体积分数为100%浸润剂时,纱线强度增加17%;二氧化硅吸湿及浸润剂吸湿是导致石英纤维纱强度下降的主要原因。

In order to study the factors affecting the strength of quartz yarns,the cross-sectional morphology of quartz fiber was characterized,the tensile properties of quartz yarns with different moisture regains and linear densities before and after weaving were tested,and the effects of warping,shedding as well as beat-up on the mechanical properties of quartz yarns were also investigated.The influence of the sizing agent on the mechanical properties of the quartz fiber was also explored.The results show that the tensile strength of quartz yarn significantly decreases with the increase of moisture regain.When the moisture regain of 95 tex quartz fiber yarn is 100%,the tensile strength decreases by 41%compared with 0%.The decrease of tensile strength of 95 tex quartz fabric that was woven under 1.0%moisture regain is as high as 60.94%.The addition of sizing agent can enhance the quartz fiber strength.When the 390 tex quartz fiber yarn is added with 100%sizing agent,the yarn strength increases by 17%.The hydrolyzing of silica and the hygroscopicity of wetting agent are the main reasons for the decrease of the strength of quartz fiber.