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"The 'Heart of Masks' — The Past and Present of Meltblown PP"

If someone asks you what was the hottest item in 2020, 80% of people would tell you "masks"! A daily consumable whose price surged dozens of times. However, for the chemical industry, meltblown PP, the "heart of masks", was even hotter than masks themselves. Even with prices increasing dozens of times, orders for some meltblown PP manufacturers were still backlogged for months. So, what exactly is meltblown PP?

Meltblown PP, or polypropylene meltblown special material, is based on polypropylene as the raw material, with various additives added, and uses a controlled rheology method to improve the resin's fluidity and molecular weight distribution. The modified polypropylene can achieve a melt mass flow rate of over 1500, with low ash content, long spinning cycles, and stable overall performance. It is suitable for the meltblown non-woven fabric forming process and serves as the main raw material for producing polypropylene meltblown non-woven products.

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The monomer of polypropylene is derived from petroleum, petroleum refining products, or natural gas cracking products, and is polymerized through coordination polymerization under the action of a catalyst. Polypropylene is a colorless and transparent plastic that possesses all the excellent properties of polyethylene, such as chemical stability, moisture resistance, tastelessness, odorlessness, ease of processing, and good electrical performance. In addition, it has many properties that polyethylene does not have. For example, its heat resistance is better than polyethylene, with a melting point of up to 170°C, so it can be used at temperatures exceeding 100°C. Polypropylene has good mechanical properties, with high tensile strength (30-38 MPa), good elasticity, and high surface strength, and there is almost no cracking caused by environmental stress. Another advantage is its light weight, with a relative density of only 0.90-0.91 g/cm³, making it one of the commonly used plastics with the smallest known relative density. Its main disadvantages are poor adhesion, dyeability, and printability, brittleness at low temperatures, susceptibility to deterioration under heat and light, flammability, and high shrinkage.