What are the common misconceptions in the use of flame retardantsIssuing time:2023-11-24 19:11 What are the common misunderstandings about using flame retardants? \Among halogen-free flame retardants, red phosphorus flame retardant is a good flame retardant, with low addition amount, high flame retardant efficiency, and smoke. It has the advantages of low toxicity, low toxicity, and widespread use. When red phosphorus is combined with inorganic flame retardants such as aluminum hydroxide and effervescent graphite, halogen-free composite flame retardants such as phosphorus/magnesium, phosphorus/aluminum, and phosphorus/graphite can be produced, resulting in a large amount of flame retardants. Can be reduced. Improve the processing performance and physical and mechanical properties of plastic products. However, ordinary red phosphorus is easily oxidized, absorbs moisture from the air, causes dust explosions, is difficult to transport, and has poor solubility in polymer materials, thus limiting its application range. To compensate for this drawback, microencapsulation technology can be used to prepare microencapsulated red phosphorus. Microencapsulated red phosphorus not only overcomes the inherent drawbacks of red phosphorus, but also has the advantages of high efficiency, low smoke, and non-toxic gas. Its dispersibility, physical and mechanical properties, thermal stability, and flame retardancy have been improved and enhanced. Misconception 1: The larger the amount of flame retardant used, the better the flame retardant effect. The limit oxygen index (LOI) and UL-94 test results indicate that the flame retardant performance of the material is related to the flame retardant dosage. With the increase of flame retardant content, the flame retardant effect first increases and then decreases. Excessive flame retardants can have a significant impact on the mechanical properties of materials. Misconception 2: Brominated flame retardants are harmless to human health and the environment There are over 70 types of brominated flame retardants. After rigorous evaluation, most of them are harmless to human health and the environment. However, certain brominated flame retardants with specific structures can form dioxins under certain conditions (such as incomplete combustion). Dioxins contain 210 compounds, which are very stable and have a high melting point. They are insoluble in water and soluble in most organic solvents. They are colorless, odorless, and fat soluble substances that can easily accumulate in the body and cause serious harm to the human body. Misconception 3: The higher the level of flame retardant, the different requirements for flame retardants for different applications. Generally speaking, people always hope that their materials have a higher flame retardant rating. However, in reality, various flame retardant testing methods have limitations, and their conclusions are relative. For example, UL94 V-0 is superior to V-2, but some electrical products require arc ignitable materials, and V-2 is superior to V-0. Due to the fact that 94v-2 plastic does not form conductivity and coking under the action of electricity, the possibility of ignition is greatly reduced, but 94v-0 plastic is completely the opposite. Misconception 4: PP flame retardant and flame retardant masterbatch are the same Polypropylene flame retardant is a powder suitable for modified granulation. Formula design must be combined with other enhancers. PP flame retardant masterbatch is a concentrated masterbatch containing flame retardants. Double axis granulation using carriers and composite flame retardants. It can be a directly processed product or particle. |