Decabromodiphenyl ether, hexabromocyclododecane, octabromo ether, etc.) But halogen-containing bellows flame retardants made of bromine-containing flame retardants are added. Conservative bellows flame retardants are modified by adding halogens. Flame retardants (e.g., at the same time that combustion is effective, it will emit smoke and corrosive gases that pollute the environment and endanger human health. These corrosive gases will damage buildings and equipment and even exceed the fire itself. Some of the more severe bromine When flame retardants are burned or thermally cracked, toxic carcinogens such as polybrominated dibenzodioxane and polybrominated dibenzofuran are formed. Therefore, there are many flame retardant users who are using halogen flame retardants. Being cautious or even unwelcome, and actively committed to the development of halogen-free flame retardants, especially in the electronic and electrical industry, halogen-free flame retardant modified corrugated pipe flame retardants have become a hot spot of research and development in recent years.

Therefore, it is called green environmental-friendly flame retardant. Halogen-free flame retardants include metal hydroxides, phosphorus-based flame retardants, and silicone-based flame retardants. Metal hydroxide has the advantages of non-toxic, non-corrosive, and no toxic gas. However, the added amount is usually more than 50% to achieve a good flame retardant effect, and the high filling amount will seriously affect the physical and mechanical properties of the data; phosphorus flame retardants are mainly used in oxygen-containing polymers, phosphorus flame retardants Due to its heavy color, red phosphorus is not suitable for products with higher color requirements, so it has greater limitations; silicone-based flame retardants have not been widely used due to their high price. Therefore, the development of a new halogen-free corrugated pipe flame retardant system has become a major issue in the field of flame retardant.

More research has been done on intumescent flame retardants. Composite flame retardants with PVC as the main core component in recent years. Can be used on a variety of flammable polymers. When the polymer with the intumescent flame retardant is burned, it will form a uniform carbonaceous foam layer on the surface. This carbon layer can play the role of heat insulation, oxygen barrier, smoke suppression and anti-drip in the condensed phase. Halogen-free, low-smoke, low-toxicity, non-corrosive gas, which has a small impact on the mechanical properties and processability of PP. It basically overcomes the shortcomings of the radical flame retardant technology, and has attracted the attention of experts at home and abroad. It is also recognized as one of the promising ways to achieve halogen-free flame retardants.