flame retardantThe functional additives that endow flammable polymers with flame retardancy are mainly designed for flame retardancy of polymer materials; there are many types of flame retardants, which are divided into additive flame retardants and reactive flame retardants according to the method of use. So what are the errors in the use of flame retardants? The following small series to introduce to you.
The more the amount of 1. flame retardant, the better the flame retardant effect
The limiting oxygen index and UL-94 test showed that the flame retardant performance of the material had a certain relationship with the amount of flame retardant. With the increase of the amount of flame retardant, the flame retardant effect showed a trend of strengthening first and then weakening, and adding too much flame retardant had a great influence on the mechanical properties of the material.
2. brominated flame retardants are harmless to humans and the environment.
Brominated flame retardants include more than 70 varieties, the vast majority of brominated flame retardants have been rigorously evaluated to prove harmless to the human body and the environment, but there are individual structures of brominated flame retardants in certain conditions (such as incomplete combustion) combustion can form dioxins. Dioxins include 210 compounds. These substances are very stable, have a high melting point, are extremely difficult to dissolve in water, and can be dissolved in most organic solvents. They are colorless and odorless fat-soluble substances, so they are very easy to accumulate in organisms. Serious harm to the human body.
3. PP flame retardant is the same as flame retardant masterbatch
PP flame retardant is a powder, which is suitable for modified granulation and needs to be formulated with other synergistic agents. PP flame retardant masterbatch is the concentration masterbatch after the compound formulation of flame retardant. It has carrier and composite flame retardant and is granulated by twin screw. It can directly process products or granulate.
The higher the 4. flame retardant grade, the better
Different uses have different requirements for flame retardancy. Generally speaking, people always hope that the flame retardancy level of the material is higher. But in fact, all kinds of flame retardant test methods have their limitations, and their conclusions are relative. Therefore, the higher the flame retardant level, the better. For example, it is generally considered that the UL94V-0 grade material is better than the V-2 grade. However, some electrical products require materials with resistance to arc ignition, then the V-2 grade is better than the V-0 grade. Because UL94V-2 grade plastics do not form conductive and coking under the action of electricity, which greatly reduces the possibility of fire, while UL94V-0 grade plastics are the opposite.
The above is about some misunderstandings in the use of flame retardants, hoping to help everyone.