Preparation And Filtration Performance Of Short Fiber Intercalated Glass Fiber Cotton Felt

With the further acceleration of the industrialization process,the environmental problems led by air pollution are becoming more and more serious,which seriously affects human health and restricts the benign development of society.Therefore,the development of environmental purification materials with excellent performance is the current research focus.As a kind of micro-nano fiber filter materials,the glass fiber felt prepared by flame blowing process has excellent properties such as fine fiber diameter,large specific surface area,high porosity.However,it also has some problems such as high volume weight,poor fluffiness and elastic recovery performance.The purpose of this paper is to develop a new preparation technology of glass fiber felt,and introduce high-crimp polyester fiber into the glass fiber felt as a supporting structure.Through the characteristics of high strength,excellent elasticity and dimensional stability of the polyester fiber to improve the volume weight,fluffiness and compression recovery performance of the glass fiber felt,in order to achieve high efficiency and low resistance filtration performance.It also has the excellent sound-absorption and thermal-insulation performance,and can expands the application field of glass fiber felt.In this paper,FLUENT software was used to simulate the short-fiber intercalated flame blowing process,and the feasibility of preparing short-fiber intercalated glass fiber felt by it was discussed.Firstly,the flow and temperature field of short-fiber intercalated flame blowing process are simulated,and the attenuation of high temperature and high-speed flame blowing flow in the glass fiber diffusion tube was observed,and the interaction between the intercalation flow and the flame blowing flow is analyzed.Secondly,the DPM discrete phase model was used to simulate the trajectories of glass fiber and short-fiber in the diffuser tube,and the mixed dispersion uniformity of the fiber in the diffusion tube was analyzed by gray histogram.Finally,the effects of different intercalation velocity and outlet negative pressure on fiber dispersion uniformity were analyzed.The results showed that it is feasible to disperse short-fibers into the main structure of glass fiber by short-fiber intercalation process and the fiber dispersion uniformity was better when the interposition of short-fiber was 2 m away from the inlet of the diffusion tube,the velocity of short-fiber intercalation was 14 m/s and the outlet negative pressure was-220 pa,which has important guiding significance for controlling the high efficiency and low resistance filtration performance of the intercalated glass fiber felt.The short-fiber intercalated glass fiber felt was prepared by carding superfine glass fiber and high-crimp polyester fiber and ultrasonic bonding technology.The function mechanism of short-fiber in the felt was analyzed,and the influence of short-fiber content and felt surface density on the filtration performance of felt was emphatically studied,and the sound absorption and thermal insulation property were briefly analyzed.The results showed that the felt prepared by carding process has similar layered structure with glass fiber felt by flame blowing process,and polyester fiber plays a supporting role as a skeleton structure in the felt.The combination of coarse and fine fibers can effectively reduce the volume weight and improve the fluffiness and compression recovery performance of felt.When the surface density of felt is 120 g/m~2 and the content of polyester fiber is 25%,the QF of felt is 0.0251,and the filtration performance is the best.At the same time,the felt has excellent sound-absorption and thermal-insulation performance.