Several common misunderstandings in the use of flame retardants

In the non-halogen flame retardant, red phosphorus is a better flame retardant, with less filling amount, high efficiency of flame retardant, low smoke and halogen-free cable, micro-toxicity, and general use of other advantages. When red phosphorus and aluminum chloride, expandable graphite and other inorganic flame retardants used together, can produce phosphorus / magnesium, phosphorus / aluminum, phosphorus / high purity graphite and other composite halogen-free flame retardants, can greatly reduce the amount of flame retardant, enhance the production characteristics of plastic products and physical properties. However, the general red phosphorus is easy to air oxidation digestion absorption of water in the air, easy to cause the explosion of aluminum powder, difficult to transport, and poor solubility of fiber materials, and therefore its use is limited. In order to better fill this insufficiency, microencapsulation process can be selected to produce microencapsulated red phosphorus. Microencapsulation of red phosphorus not only solves the original defects of red phosphorus, and has the advantages of high efficiency, low smoke and no halogen cable, no harmful gases. Its dispersion, physical properties, heat resistance and flame retardant properties have been improved and upgraded.

Misconception 1: The more flame retardants used, the better the flame retardancy effect

The results of LOI and UL-94 tests show that the flame retardancy of raw materials is related to the amount of flame retardant. Along with the enhancement of flame retardant dosage, the actual effect of flame retardancy first expands and then decreases. Together with too much flame retardant has greater harm to the physical properties of the material.

Misconception 2: Brominated flame retardants are harmless to the body and natural environment

There are more than 70 kinds of brominated flame retardants. The majority of them are not harmful to the body and the natural environment after severe evaluation. Unknown to the public, some brominated flame retardants with certain structures can produce dioxins under certain circumstances (e.g., ethanol combustion). Dioxins contain 210 chemicals, they are very smooth and have a high melting point. They are difficult to dissolve in water and can dissolve in most organic solutions. They are colorless, odorless, fat-soluble substances that tend to accumulate in plants and pose a serious threat to the body.

Misconception 3: the higher the fire rating the better

Different places of application have different regulations on fire resistance. Generally speaking, people have been expecting higher fire rating of raw materials. But in fact, a variety of flame retardant test standards have their limitations, and the results are corresponding. For example, UL94V-0 is stronger than V-2. However, there are some home appliances that require raw materials to be resistant to electrical ignition, and V-2 is better than V-0. As 94v-2 plastic in the effect of electricity is unlikely to produce conductivity and slagging, which greatly reduces the probability of fire, while 94v-0 plastic is the opposite.

Misconception 4: PP flame retardant and flame retardant masterbatch the same

Polypropylene flame retardant is a powder form suitable for granulation of modified materials. It must be mixed and matched with other synergists to the secret formula design program. pp flame retardant masterbatch refers to the concentrated masterbatch mixed and matched with flame retardants. Selection of medium and composite flame retardants, single screw granulation. It can also be commodities or granules that can be produced directly.