The flame retardant system of the P-N-based intumescent flame retardant generally comprises three parts, namely a carbon source (often a polyhydroxy compound such as pentaerythritol), an acid source (such as ammonium polyphosphate, ie APP) and a blowing agent (such as melamine).
PN-based intumescent flame retardant GWIT 850 °C is related to the thickness of the part and the amount of flame retardant added. The larger the amount of flame retardant added and the thicker the thickness, the easier it is. The PP-free halogen-free flame retardant can be added. The glow GWIT 850 °C is independent of the thickness of the part and is only related to the amount of flame retardant added.
PN-based intumescent flame retardant added 30%, 40%, glow wire GWIT 850 ° C (0.8MM, 1.6MM, 3.2MM) is basically too much; can be filled with PP halogen-free flame retardant added 30%, 40% , can not pass the glow wire GWIT 850 ° C.
PN-based intumescent flame retardant is added 50%, and the glow wire GWIT850°C (0.8MM, 1.6MM, 3.2MM) can basically pass. Because the filling is too large, the product affects the mechanical properties, and the cost is high, and the PN system expands. The market price of flame retardants is about 25 yuan per kilogram. Can add PP-free halogen-free flame retardant to add 50%, glow wire GWIT 850 ° C (0.8MM, 1.6MM, 3.2MM) can be over, make the product will not be very brittle, low cost, can be filled with PP halogen-free resistance The market price of the fuel is about 16 yuan per kilogram.
Why does the P-N-based intumescent halogen-free flame retardant lose its flame retardant effect after adding filler or other substances?
In order to reduce the cost, many people added some fillers such as calcium carbonate, barium sulfate, talc, magnesium hydroxide, etc. to the P-N-based expanded halogen-free flame retardant, and found that the flame retardant effect was lost. It is because the addition of the above filler changes the esterification reaction process, and the acid source partially reacts with the above filler, and the above filler destroys the formation of the carbon layer on the surface of the material, resulting in failure of the mechanism.
By the same token, adding some carbon black and toner will also cause the flame retardant effect to be lost. Therefore, some recycled PP materials may be partially filled with PP and added to the new material, which causes the system to be phased into the above-mentioned filling, which makes the system lose its flame retardant effect. The above problem does not exist if a PP-free halogen-free flame retardant can be added.
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