Recently, at the "Textile Light" high-temperature filter material preparation technology and application of scientific and technological achievements promotion activity held in Funing County, Jiangsu Province, a number of experts brought technical reports to promote the high-temperature filter material preparation technology and application of scientific and technological achievements.
Professor Liu jingxian, secretary general of the filtration and separation textile branch of China industrial textile industry association and professor Liu jingxian of northeast university, introduced the innovation points of spunlace filter material for ultrafine denier wet fine filter surface layer in the report "spunlace filter material based on ultrafine denier wet fine filter surface layer": the fiber diameter of ultrafine denier fiber surface layer can be less than 1μm; Wet forming mesh, more uniform mesh and smaller mesh weight, solving the problem of difficult to reinforce and carding, significantly reduce the pore size of the filter material and improve the collection efficiency of fine particles; The diameter of the surface fiber can be finer, so that the dust surface layer is denser, the collection efficiency is higher, and the ash cleaning performance is better. The coarse fiber at the bottom layer is used as a support to fully ensure the mechanical strength and service life of the filter material. The carding difficulty increases with the thinning of the fiber diameter, and the fibers below 5μm are difficult to carding, and the gram weight can be very low; perfect solution to micron, sub-micron fiber carding problem.
Wang Fei, Vice Minister of Technology of Jiangsu Dongfang Filter Bag Co., Ltd., pointed out in the report "Key Preparation Technology and Industrialization of High Performance Filter Material" that the advanced technology of PPS fiber anti-oxidation and high temperature resistance modification is shown in the oxidation induction temperature of 484 ℃, the heat resistance of needle punched filter material, the normal temperature longitudinal strength of 1090N, 220 ℃ 24h longitudinal strength of 1125N, 220 ℃ 48h longitudinal strength of 1084N. The advancement of PTFE material refinement and enhancement technology for high temperature resistant filter material is shown in that the film thickness is above 20μm, the filament strength for base cloth is> 4.2cN/den, the length is> 11000m, and the fiber content of membrane crack fiber width <16μm is> 60%. The advancement of low-damage needling entanglement composite technology of filter material is manifested in the use of elliptical needling needles and new needling entanglement technology to enhance the strength retention rate of the base fabric> 85%. The advancement of water and oil repellent and antioxidant hydrolysis functional finishing technology is shown in that the resin full coating finishing can improve the overall effect of dust removal, with a specific strength of 4.636N/(g/m2), a dust removal efficiency of 99.998 and a dust stripping rate of 94.4.
Wang Hong, associate professor of Donghua University, pointed out in the report "High Temperature Filter Materials and Foam Coating Technology" that the foam coating has the characteristics of reducing the amount of liquid in the specific fabric, shortening the drying time and reducing the cost. Bubbles can increase the volume of the coating solution and make the solution spread evenly to the filter materials. The research contents and schemes of foaming coating technology include: preparation of PTFE foaming coating liquid, preparation of PTFE foaming coating liquid by using PTFE emulsion, foaming agent, foam stabilizer and thickener, and high-speed shear foaming; research of foaming coating process, coating the foaming coating liquid on the glass fiber base cloth by doctor blade coating technology, and curing into a film by two-stage high-temperature drying; the performance test and comparison of the foam coating filter material, the performance test and comparison of the foam coating composite material and the untreated glass fiber base cloth and the film product.
He Jianxun, an engineer of Fujian Nanfang Co., Ltd., introduced in the report "Research and Development and Industrialization of High Temperature Composite Filter Material Products" that with the goal of "Research and Development of Spunlace + Base Cloth + Needle Punched High Temperature Composite Filter Material Products", a series of new products of high temperature composite filter material 300~650g/m2 have been developed, with filtration efficiency reaching more than 99.95, filtration resistance ≤ 200pa and outlet dust concentration ≤ 10mg/Nm3. The innovation point of the project is that the high-temperature environmental protection filter material production equipment of double carding, double paving and double pre-stab will form the multi-functional fiber layer of the filter material at one time, with a three-dimensional sandwich structure with uniform fiber mesh, no composite folds and strong strength to meet the requirements. The innovative design of the flower recycling classification system solves the problem of impurity and short pile pollution on the cloth surface, and can recover the effective fibers sucked away by the suction edge and improve the production rate; the new foam coating technology includes new foam generator, foam coating method and PTFE foam coating self-developed formula; the preparation technology of high temperature composite filter material can improve filtration accuracy and filtration efficiency, reduce filtration resistance and reduce costs.
Cai Weilong, senior engineer of Xiamen Sanwei Silk Environmental Protection Co., Ltd., put forward the innovative structural design of "three-dimensional asymmetric" filter material in the report of "Preparation Technology and Industrialization of High-efficiency Dust Removal Filter Material for Cement Kiln Collaborative Disposal", realizing the transformation from "deep filtration" to "surface filtration" and realizing a new breakthrough in filter material product design. Breakthrough the technical problems of needling and spunlace composite process, developed the key technology industrialization of spunlace filter material.
Source: Carl Jung International Nonwovens Business
Xu Tao, deputy chief engineer of Sinoma Technology Co., Ltd., introduced in the report "Development and Application of Coated Filter Material for Blast Furnace Gas Purification" that the key technologies of coated filter material have the characteristics of high-efficiency and low-resistance PTFE membrane preparation, high-performance substrate preparation, high-temperature coating, etc. High-efficiency PTFE filter membrane preparation technology has the characteristics of high expansion degree, controllable pore size and high uniformity. High-performance substrate preparation technology pioneered TFM treatment formula and coating, the glass fiber cloth and composite needle felt coated filter material produced has the characteristics of high filtration efficiency, dust emission within 5mg/Nm, high waterproof, waterproof grade 4 or above, high strength, high temperature resistance, folding resistance, etc.
