The Research Of Surface Modification Of Low-temperature Plasma Of Basalt Fiber

The mechanical properties of Basalt Fiber(BF)are good,chemical properties are stable,high temperature resistance,acid and alkali resistance and UV resistance are high,low hygroscopicity,in addition,good insulation performance,high temperature filterability,radiation resistance,good wave transmission performance and no pollution during production and other advantages.However,because the surface of BF fiber is smooth and the bonding performance is poor,modification is often used to improve its surface performance.This subject uses low-temperature plasma surface modification technology to modify the surface of BF fiber and its products.By performing relevant performance tests on samples before and after processing,various processing parameters such as discharge power and discharge time of the low-temperature plasma equipment are systematically studied.And the effect of discharge voltage on the modification effect of BF fibers and their products.Orthogonal experiments were developed to analyze the tensile properties of the fibers before and after modification by a single fiber tensiometer;the BF fibers before and after modification were tested by a friction coefficient meter Calculate the dynamic and static friction coefficients;use the contact angle measuring instrument and capillary effect tester to test and analyze the wettability of the fibers and products before and after modification;use the reverse peel test to determine the peel strength of the single fiber and BF fiber products.The interfacial shear strength of single fiber and its products was measured by the extraction method;the optimal experimental scheme design was systematically analyzed.At the same time,the scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS)and other experimental equipment were used to characterize the morphology and chemical composition of the surface of the BF fiber.The research results show that the low temperature plasma treatment has improved the surface bonding properties of BF fibers.(1)Study on the effect of low temperature plasma treatment on BF surface performance.Influence of BF surface friction properties.With the extension of treatment power and treatment time,the coefficient of friction on the surface of the fiber increased.The sample was treated with a discharge power of 225 W,a discharge time of 5 min,and a discharge voltage of 20 Pa.The static friction coefficient was increased by 71.39 compared with the untreated fiber.And its coefficient of dynamic friction is also relatively large;the average height of the wicking is higher,reaching 68.87 mm,which is62.70%higher than the untreated original wicking ability,the contact angle becomes smaller,and the fiber hydrophilicity is enhanced;In case of excessive damage to the mechanical properties,an optimized solution is obtained comprehensively.(2)Research on the influence of BF surface microstructure.The surface of the fiber without the low temperature plasma treatment is smooth;the BF is etched on the surface after treatment,which is dotted depressions and granular protrusions,indicating that the treated fiber surface becomes rough,directly increasing the geometric contact area of the fiber surface,which can improve its adhesion;analysis of the surface element composition of basalt fiber before and after low temperature plasma treatment,after the low temperature plasma treatment,the oxygen content of the BF surface changes,etc.O atoms in the air generate Si O₂;the Si 2 p content of the fiber changes significantly after treatment,from 1.5%to 16.73%after treatment,which is beneficial to increase the fiber shear strength.At the same time,the strength of O element increases,indicating that new oxygen-containing groups are introduced,which provides greater possibility for the wicking effect on the surface of BF and further improves the wettability of the fiber.(3)Research on the bonding performance of BF,and fitting analysis of the correlation between the friction performance and bonding performance of BF fiber.The peel strength of the sample was significantly improved,and the peel strength was increased by 92.79%compared with the untreated sample.The shear strength of single fiber is higher,which is 128.22%higher than that of untreated fiber.A mathematical model is established to analyze the peel strength and the dynamic and static friction coefficient of the BF fiber.The regression curve is the model formula of the relationship between x(static friction coefficient)and y(peel strength):y=47.746-170.694 x+233.514 x²;Model formula of the relationship between x(dynamic friction coefficient)and y(peel strength):y=12.640-24.955 x+191.088 x²;A mathematical model is established to analyze the shear strength and the static friction coefficient of BF fiber.The model formula of the relationship between x(static friction coefficient)and y(shear strength)is:y=0.818-3.039 x+6.483 x²;And the model formula of the relationship between x(dynamic friction coefficient)and y(shear strength)is:y=0.142-0.266 x+9.637 x².The correlation between the bonding performance and the friction performance is obtained to guide the development,production and use of BF fiber.(4)The surface modification of low-temperature plasma has a certain timeliness.After low-temperature plasma treatment,the modification effect changes with the extension of the standing time.The attenuation rate of BF at different temperatures is different,and the higher the temperature,the faster the attenuation,but after 10 days,it tends to be smooth and comparable to the untreated original wicking ability;different placement environments have different effects on BF The wicking capacity of ionized water decreased in the first 5 days,and then increased in 5 days,indicating that the surface etching formed by the low temperature plasma treatment of the BF fiber without other media in the water will gradually disappear.