What is the mechanism of flame retardant coefficence of Boehmite (AIOOH)?
Take a closer look at the above chemical reaction equation :
1. Magnesium hydroxide needs to absorb 1,300 kilojoules to release water;
2. Boehmite only needs 700 kilojoules to absorb heat and release water;
To release the same weight of water, a boomerang absorbs only 700 kilojoules (see chemical equation) to release water quickly, while magnesium hydroxide absorbs 1,300 kilojoules (see chemical equation) to release water more slowly.However, the water content of boehmite is too little, so the flame retardant effect is general when the boehmite is used alone.Therefore, when the magnesium hydroxide with "high water content but slow release" is used in combination with "low water content but fast release", the flame retardant effect will be improved. In addition, the ultrafine particles of the boehmite with a higher flame retardant efficiency of 600~800nm will show a good flame retardant synergism.
General lighter flame temperature for 300-500℃ bar, alcohol lamp 600-700C bar, alcohol torch flame temperature in 800℃ or so.When the magnesium hydroxide and boehmite recipe (standard test bar), spline was lit when the temperature must be over 400 ℃, two kinds of packing began to absorb heat at the same time, the only boehmite absorb less heat can be released water of crystallization, and magnesium hydroxide to absorb nearly twice as much heat will release water of crystallization, is the release of water of crystallization of boehmite with fast ability, so do in magnesium hydroxide flame retardant are formulated boehmite will embody the flame retardant effect.
Take a visual example: a house is on fire and a neighbor who lives nearby comes to help put out the fire with water (Pomstone) and then the fire brigade comes to put out the fire (magnesium hydroxide). If you just wait for the fire brigade to put out the fire without first helping yourself, of course the damage is serious.Q: Why does Boehmite also work with aluminum hydroxide flame retardant?What is the mechanism?The water loss temperature of aluminum hydroxide is too low (about 200℃), so it releases all the water early. When the flame/fire temperature gradually rises, there is no water to continue to release to flame retardant.However, the temperature of boehmite releasing crystal water is about 340℃, which can make up for the premature water loss of aluminum hydroxide and achieve the role of flame retardant co-efficiency.
