Reactive flame retardants: Added flame retardants can react with chemicals.
1. Refers to molecules containing flame retardant elements (such as phosphorus, chlorine, bromine, nitrogen) and reactive groups (carboxyl, hydroxyl and acid anhydride, etc.) small molecule flame retardant.
2. The reactive flame retardant is directly combined with polyester molecules, the flame retardant effect is uniform, and the flame retardant is durable. In the process of flame retardant fiber, the flame retardant will not precipitate the fiber, and usually the low content (3% ~ 8%) of flame retardant can make the fiber have good flame retardant effect.
Additive flame retardants: Bromine flame retardants are directly added to plastics without physical or chemical reactions with plastics.
1. Halogen additives: Most of the additives are aromatic derivatives of bromine. Due to the lack of active hydrogen molecules on the neopentyl group containing bromine, these compounds are relatively stable and almost no hydrogen bromide is released during heating.
2. Phosphorus additives: additives containing phosphorus are generally phosphate ester, phosphonate ester, phosphonate ester and (trihydrocarbyl) phosphonate oxide.
3. The performance difference between various organophosphorus additives applied to polyester is not to affect the flame retardant performance, but to affect the performance of fiber and textile, so the amount of phosphorus should be appropriate.