Introduction to Fire Retardants for Fireproof Foam

Aluminum Hydroxide

Also known as hydrated alumina. The aluminum hydroxide used as a fire retardant is mainly @-tri-hydrated alumina. It appears as a white fine crystalline powder with an average particle size of 1-20 micrometers. Its relative density is 2.42, refractive index is 1.57, and 30% slurry pH is 9.5-10.5. The dehydration initiation temperature is 200 degrees Celsius, with an absorption heat of 2.0 KJ/G.

During combustion, it releases a large amount of chemically combined water, absorbs a considerable amount of heat, slows down the polymer's thermal degradation rate, reduces the material surface temperature, delays and suppresses the combustion of the substrate. It will generate a large amount of steam on the substrate surface, diluting the oxygen in the combustion zone, reducing the concentration of smoke and toxic flammable gases. The aluminum oxide generated during combustion can promote the formation of a carbonized protective layer on the polymer surface.

Melamine

Commonly known as melamine, it is a white monoclinic crystal with low toxicity, non-flammable, and a melting point of 354 degrees Celsius. It undergoes endothermic sublimation and rapid decomposition under high heat. At temperatures between 250-450 degrees Celsius, it can absorb a large amount of heat and release nitrogen during decomposition, slowing down the material's combustion rate. At the same time, it forms a carbonized barrier layer on the substrate surface, acting as a fire retardant. However, there are some dispersion problems, so it needs to be used in combination. When used as a fire retardant, high-temperature decomposition can produce toxic cyanide gas.

Organophosphorus Flame Retardant

Tris(1,3-dichloro-2-propyl)phosphate (TDCPP)

A pale yellow transparent viscous liquid. It contains 7.2% phosphorus and 49.4% chlorine, with a flash point of 251.7 degrees Celsius, ignition point of 282 degrees Celsius, and spontaneous combustion temperature of 514 degrees Celsius. It starts to decompose at 230 degrees Celsius and is soluble in alcohols, benzene, carbon tetrachloride, etc. When used at 5%, it can achieve self-extinguishing properties, and at 10%, it can make the material self-extinguish or non-flammable, while also having water resistance, light resistance, and antistatic properties.

Fire Retardant Polyether Polyol

1. Formula Ingredients:

Polyether polyol 3050: Mn3000;

Flame-retardant polyether polyol: Hydroxyl value 28, flame-retardant solid mass fraction 23%;

Silicone oil: L580

Triethylene diamine solution: Mass fraction 33%;

Tin octoate solution: Mass fraction 33%;

TDI: Industrial grade