What are the common issues with using halogen-free flame retardants?


Halogen-free flame retardants are flame retardant mixtures of halogenated polymers or polymers, which have been widely used. There are still quite a few knowledge points that we need to understand before use, and many users may not be clear about these basic issues. Below, let's talk about some relevant information about halogen-free flame retardants. If you want to know, come and take a look. I hope it can be helpful to you.
1. Why is the halogen-free flame retardant used in fiberglass PP less effective? Generally speaking, as the amount of PP decreases and the amount of halogen-free flame retardants increases, the flame retardant effect of the material will become better and better. The number of parts remains unchanged, but the flame retardancy may deteriorate or even become non flame retardant. Of course, this is mainly because the addition of glass fiber disrupts the flame retardant mechanism of the P-N expansion system. Fiberglass is distributed throughout various parts of plastic. The sealing of the carbon layer has a significant destructive effect, making it impossible to isolate oxygen and achieving a flame retardant effect.
2. Why do some PP produced with halogen-free flame retardants precipitate oily or powdery substances on the surface after being left for a period of time (dozens of days)? As we mentioned, the composition of halogen-free flame retardants is composed of carbon sources, acid sources, and gas sources. At this point, it will naturally cause material precipitation, which must be one or several of the above substances. Compatibility has deteriorated. During the processing, materials and the powder on top are dispersed under the strong mechanical force of the screw machine. After being left for a period of time, the main reason is due to the continuous movement between molecules, and the movement of materials with different polarities is slow. Slowly, it will separate, and the above-mentioned powder will gradually precipitate from the inside of the material to the surface.
3. Why does the expansion type halogen-free flame retardant lose its flame retardant effect when added to fillers or other substances? In fact, what everyone needs to know about this issue is that many manufacturers have added some fillers, such as calcium carbonate, barium sulfate, talc powder, etc., to the P-N series of expansion type halogen-free flame retardants in order to reduce costs. However, it is found that the flame retardant effect is lost Similarly, the addition of the above-mentioned fillers changes the esterification reaction process, and the acid source will partially react with the above-mentioned fillers, which destroys the formation of the carbon layer on the surface of the carbon layer. Material, causing the mechanism to fail. Similarly, adding some carbon black and carbon powder can also lead to the loss of flame retardant effect.
4. Why do different PPs add the same amount of halogen-free flame retardants, resulting in differences in flame retardant efficiency? Here we need to know that different PP matrices, such as homopolymerization or copolymerization, have differences in flame retardancy due to their varying internal ethylene content. Generally speaking, copolymers are more difficult to achieve flame retardancy than homopolymers. Some corresponding halogen-free flame retardants may also be added more.
5. Why do some halogen-free flame retardants cause foaming or graying during PP processing? In fact, any halogen-free flame retardant has its initial decomposition temperature. If the decomposition temperature of halogen-free flame retardants themselves is only close to the melting temperature of the material, the above situation is likely to occur. Therefore, in general, the initial decomposition temperature should be at least 50 degrees higher than the material plasticization processing temperature to ensure smooth processing. If you have any questions, you can call our phone number at any time to inquire. You can access the official website to see the contact information, and you can also consult online personnel. We will help everyone solve some problems with quotation methods.
The above article provides a basic overview of halogen-free flame retardants for friends, and also shares a good halogen-free flame retardant manufacturer in the content. If you have any needs in this area, you can check it out. I hope it can be helpful to you.

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