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Introduction of composite membrane
2020.12.22The composite membrane is a microporous membrane or ultrafiltration membrane as a branch layer, and its surface is covered with a separation membrane composed of a dense average mode with a thickness of only 0.1-0.25 μm as a barrier layer. This greatly increases the amount of material permeated.
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Commonly used plastic identification methods
2017.09.041. Density method: examine the density of various plastics, use liquid as the medium, examine the ups and downs of the plastic in the liquid medium, to roughly distinguish the major types of plastics, such as a piece of plastic in water, floating on the surface of the water, it can be concluded that the raw material is not PVC (due to the density of PVC>1). 2. Combustion method: It mainly examines the color of the flame and the smell and smoke emitted during combustion. Generally speaking, the burning flame of polyolefin materials is mostly blue or light blue, the smell is relatively mild and light, and the smoke is white. Most raw materials with benzene or chlorine are easy to emit black smoke and strong smell after burning. In addition, if PE and PP have dripping burning phenomenon, while PVC etc.
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Commonly used plastic varieties performance and use
2017.09.04Polyethylene: Commonly used polyethylene can be divided into low pressure polyethylene (HDPE), high pressure polyethylene (LDPE) and linear high pressure polyethylene (LLDPE).
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Conventional varieties and classifications of plastics
2017.09.04In daily life, most of the plastics that we can directly touch or perceive are conventional general-purpose plastics, mainly including five categories: PE, PP, ABS, PVC, PS, these five categories of plastics account for the vast majority of plastic raw materials.
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