w 1. Application in the field of air purification: it is used for air purifier, as a sub-high-efficiency and high-efficiency air filter element, and as a coarse and medium-efficiency air filter with large flow rate. It has the advantages of small resistance, large strength, excellent acid and alkali resistance, corrosion resistance, stable efficiency, long service life and low price. There is no short fleece phenomenon in the purified gas. 3. Liquid filtration materials and battery diaphragm: polypropylene melt-blown filter cloth used in acidic and alkaline liquid, oil, oil has very excellent performance, such as the battery industry at home and abroad has been regarded as a good membrane material, and has been widely used, not only reduces the cost of battery, simplifies the process, and greatly reduce the weight and volume of the battery. 4. Oil absorbent materials and industrial wipes: polypropylene melt spraying cloth made of various oil absorbent materials, oil absorption up to the weight of 14-15 times, widely used in environmental engineering, oil-water separation engineering, in addition, in industrial production, can be used as oil and dust clean materials. These applications give full play to the characteristics of polypropylene and the adsorbability of the ultrafine fiber produced by melting and spraying.