Halogen-free flame retardant development

Halogen-free flame retardant is one of the fastest growing additives material, it enables the non-fire-retardant materials equip with flame retardant properties. It does not burn easily or to extinguish under certain conditions. As halogen-free flame retardant technology advances, there are more and more kinds of halogen-free flame retardants, whose performance has been significantly improved.

Its flame retardant effect can be of two types: slow down the fire and stop the fire from spreading, by way of multiple effects principle suppress the combustion reaction; let the surface foam quickly expands and carbonation to form a protective. With the improvement of people's awareness of environmental protection and safety awareness, halogen-free flame retardant will have greater development in the future.




Halogen-free flame retardant additive mainly are phosphorus compounds and metal hydroxides. No corrosive gases and no volatile when burned makes these two compounds known as environment-friendly flame retardant. Besides, silicone flame retardants and nitrogen flame retardant and other several new types of non-halogen flame retardant. These new types of halogen-free flame retardants are new products in line with international standards.

The demand of halogen-free phosphorus flame retardant is increasing. Ammonium Polyphosphate is an important added inorganic halogen-free flame retardant. It contains large amount of phosphorus and nitrogen, good thermal stability, cheaper, less toxic, near-neutral and can be mixed with other halogen-free flame retardant. As a result, it is widely used in various fields.

However, due to its chemical structure, it has strong Hygroscopicity. At the same time, it will be ion separation and reduce the flame retardant efficiency under high temperature and high humidity. And add APP in the organic material will reduce the mechanical strength of the material itself, as well as its normal use. Although modification methods can strengthen APP combined with the organic substrate, reducing the effect on the mechanical properties of the substrate, but regardless of the method it only applies to the portion of the flame retardant material, it cannot be universally applied. Therefore, surface modification can just for only one or one type of material.

While raising the degree of polymerization of the APP will fundamentally solve the moisture problem. So production of high degree of polymerization of the APP is the direction of the current. In view of this, it should increase high degree of polymerization synthesis APP technology research and development. Also it should take into account waste gas treatment and expand the scale of production.

In addition, a variety of techniques are applied for the modification to APP to improve its thermal stability, compatibility with resins, reduce its moisture absorption, etc. According to substrates and different areas of application to develop series, dedicated APP products to meet the needs of different consumers. View more about OKCHEM!
Source: https://www.okchem.com/news/halogen-free-flame-retardant-development.html