What effect does static electricity have on plastic products? What are the countermeasures?
When two solids with different physical states are in contact with each other, charge redistribution occurs on their respective surfaces. After re-separation, each solid surface will have an excess of positive (or negative) charge before contact. The phenomenon is called static electricity. To characterize the material's conductivity, the resistivity concept is referenced. The volume resistivity is the ratio of the potential gradient parallel to the direction of current on the surface of the material to the current over the unit width of the surface. Generally, a high-molecular material has a high electrical resistivity, so that once it is charged, it is difficult to eliminate. In daily life, when people walk on the plastic floor, the friction between the sole and the floor will cause the human body to be charged. In severe cases, if the human hand is in contact with the door handle or the object, it may cause a discharge phenomenon to make people feel electrophysical; medical A tremor accident caused by surgery. In the electronics industry, human body charging is easy to break through the circuit, causing damage to the integrated circuit; the textile industry causes fiber aggregation and so on. There are two ways to eliminate polymer static electricity. (1) Adding conductive filler: for example, metal, carbon fiber, carbon. This method requires a large amount of filler. When the filler must reach a certain percentage, the conductivity will suddenly change, and the antistatic effect will be achieved. The color and quality of the added multi-products are greatly limited. For example, the conductivity of the Carbon Black-filled PP conductive material changes significantly when the percentage reaches 15%. At this time, the color of the material cannot be adapted to various kinds of aesthetic requirements. Metal fillers give the material a high quality. Metal fiber fillers are small in quality but easy to break during processing, easy to be oxidized, and expensive. (2) Adding an antistatic agent to activate the surface and improve the surface conductivity: Among them, the surface-coated antistatic agent has low durability and is easily lost due to friction and washing, and can only provide temporary or short-term resistance. Electrostatic effect. 2. The compounding antistatic agent has high durability, but has high requirements for antistatic agents. Sulphur Black Dyes Sulphur Black Br,Dyes Sulphur,Disperse Dye,Carbon Black FORING IMPORT & EXPORT CO.,LTD , https://www.foringfor.cn
Green Black and Blue Black. Black uniform powder. Insoluble in water and Etanol. In the Sodium sulfide solution solubility is good, for green black; Add Sodium hydroxide and Sodium sulfide solution of colour and lustre is blue; Add hydrochloric acid Sodium sulfide solution to have green black precipitation; In the cold part of concentrated sulfuric acid solution, after heating for deep green light blue, further heating into dark blue; In 25% of fuming sulfuric acid for black blue, dilution after green black precipitation. Dyeing content in alkaline insurance powder solution for yellow olive, after oxidation can restore the original colour and lustre; In Sodium hypochlorite solution all fade, join concentrated sulfuric acid no effect. Mainly used for cotton, vinylon/cotton blended fabric dyeing, and can also be used to hemp, viscose fiber dyeing.