Zhejiang Rui High-tech Materials shares common misunderstandings in the use of flame retardants

Zhejiang Rui High-tech Materials shares common misunderstandings in the use of flame retardants:

Misunderstanding 1: The more the amount of flame retardant, the better the flame retardant effect

Oxygen index and UL-94 test experiments show that the flame retardant performance of the material is related to the amount of flame retardant. With the increase of the amount of flame retardant added, the flame retardant effect showed a trend of increasing first and then weakening, and adding too much flame retardant had a great impact on the mechanical properties of the material.

Myth 2: Brominated flame retardants are harmless to the human body and the environment

Brominated flame retardants include more than 70 varieties. Most brominated flame retardants have been strictly evaluated and proved to be harmless to the human body and the environment, but there are individual structures of brominated flame retardants that can burn under conditions (such as incomplete combustion). form dioxins. Dioxins include 210 kinds of compounds. These substances are very stable, have a high melting point, are extremely insoluble 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 the body. Serious harm to human body

Misunderstanding 3: The higher the 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, various flame retardant test methods have their limitations, and their conclusions are relative. Therefore, it is not that the higher the flame retardant level, the better. For example, it is generally considered that the material with the UL94 V-0 level is better than the V-2 level. However, some electrical products require materials to have arc ignition resistance, and V-2 grade is better than V-0 grade at this time. Because UL94V-2 grade plastics will not form conductive and coke under the action of electricity, thus greatly reducing the possibility of fire, while UL94V-0 grade plastics are the opposite.

Misunderstanding 4: 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 compounded with other synergists for formula design, while PP flame retardant masterbatch is the concentration masterbatch after the compound formula of flame retardant, with carrier and composite flame retardant. It is made of twin-screw granulation, which can be directly processed into products or granulated.