The research and application of flame retardants are moving towards the development direction of non-halogenated

2022-11-28 09:59:18

When the polymer burns, carbon formation in the condensed phase can achieve the purpose of flame retardancy. When the thickness of carbon on the surface of the material reaches 1mm, it can withstand a high temperature of 743°C without catching fire. In coatings, pentaerythritol, polyphosphate and melamine can be used as good carbonizing agent, carbonizing catalyst and blowing agent respectively. If the three are added to the coating in a certain proportion, a flame retardant coating with excellent performance can be made.

Since the addition of flame retardants to polymers can increase the amount of smoke, smoke elimination has become an important research topic. Smoke suppressants are additives that can effectively reduce smoke generation and smoke density. The focus of the application of smoke suppressants is PVC and molybdenum-containing smoke suppressant are effective smoke suppressants. In addition to molybdenum trioxide and octaaluminum acid, the newly developed smoke suppressant zinc molybdate is a smoke suppressant with low poisoning rate and excellent flame retardancy.

Due to the high price of aluminides, compounds such as zinc borate, aluminum hydroxide, zinc, silicon, and phosphorus are often added after compounding with a small amount of aluminides. This is a more realistic way to solve the current smoke elimination problem.

Flame retardants are additives that make polymers less prone to fire, making them burn slower. According to the classification of elements contained in flame retardants, they can be divided into organic and inorganic flame retardants. Organic flame retardants can be divided into flame retardants, halogen flame retardants (including chlorine and bromine di) and nitrogen-based flame retardants; inorganic flame retardants include antimony compounds, phosphorus and phosphoric acid, boron compounds, aluminum magnesium hydroxide, zirconium compounds and Bismuth compounds. With the development of science and technology and the improvement of people's awareness of environmental protection, the research and application of flame retardants in today's world are moving towards the development direction of non-halogenated.

The representative of the application of inorganic flame retardant with aluminum hydroxide and magnesium hydroxide is to dilute the mass fraction of oxygen in the air by chemical decomposition to absorb heat and release water to form a flame retardant effect on polymers and to decompose the insulating layer on the surface of magnesium oxide After the formation, it has the chemical stability of non-toxicity, smoke and decomposition product inhibition (alumina, magnesium oxide) series, so it does not cause secondary damage.