The water content of brucite is particularly high, about 31%; the differential thermal analysis of brucite shows that the temperature of thermal decomposition dehydration is between 420 ~ 520 ℃, which is close to the combustion temperature of general articles, so it can be used as fire retardant coating and flame retardant. Brucite, as a new type of filled flame retardant, can reduce the surface temperature of the synthetic material in the flame by releasing the combined water and absorbing a large amount of latent heat when it is heated and decomposed. It has the function of inhibiting polymer decomposition and cooling the combustible gas produced. The flame retardant based on brucite has good flame retardancy and reinforcement, and it is non-toxic, pollution-free and weathering resistant. It is also suitable for high temperature molding process.

 

 

What are the advantages of magnesium hydroxide flame retardant?

 

1. It can play the role of flame retardant and filling.

 

2. Due to the high processing temperature of magnesium hydroxide, it can be applied to the resin with high processing temperature.

 

3. It is non-toxic and tasteless, does not produce toxic gas and corrosive gas when burning, and does not corrode the mold.

 

4. Not volatile, not affected by water.

 

5. The high thermal decomposition temperature of magnesium hydroxide is conducive to the improvement of plastic processing temperature, accelerating extrusion speed and shortening molding time.

 

6. The neutralization ability of magnesium hydroxide and acid is strong, which can neutralize the acid gases such as sulfur dioxide and carbon dioxide produced in the process of plastic combustion.

 

7. It is beneficial to absorb combustion heat and improve flame retardant efficiency.

 

8. Magnesium hydroxide has strong smoke suppression ability, small hardness and small friction to equipment.

 

 

Flame retardant can be divided into organic flame retardant and inorganic flame retardant according to chemical composition. Organic flame retardants are divided into two series: phosphorus series and halogen series. Organic flame retardants are gradually being replaced by inorganic flame retardants due to their disadvantages such as toxic decomposition products and smoke.

 

Aluminum hydroxide and magnesium hydroxide are two of the most important inorganic flame retardants. Their common characteristics are environment-friendly, flame-retardant, smoke suppression and filling functions. Aluminum hydroxide is one of the earliest inorganic flame retardants. As a flame retardant, aluminum hydroxide has the characteristics of good stability, non-toxic, non corrosive gas, long flame retardant effect, and high whiteness. Magnesium hydroxide flame retardant is a kind of inorganic flame retardant which is being actively developed at home and abroad. In addition to the above advantages of aluminum hydroxide, it is thermally stable Magnesium hydroxide is superior to aluminum hydroxide in terms of its properties of anti smoke and anti smoke. The dehydration of magnesium hydroxide occurs only when the temperature is above 350 ℃, and the heat absorption capacity of magnesium hydroxide is 17% higher than that of aluminum hydroxide, which also helps to improve the flame-retardant efficiency. At the same time, magnesium hydroxide is more suitable for processing polymers with high temperature. It can be seen that different flame retardants have different characteristics and uses.

 

At present, there is a large amount of aluminum hydroxide in China, but with the increase of polymer processing temperature, aluminum hydroxide is easy to decompose and reduce the flame retardant effect. Compared with aluminum hydroxide, magnesium hydroxide has the following advantages:

 

1. The thermal decomposition temperature of magnesium hydroxide reaches 330 ℃, which is 100 ℃ higher than that of aluminum hydroxide, so it is beneficial to improve the processing temperature of plastics, accelerate the extrusion speed and shorten the molding time. The product has high glossiness, no surface defects, and high peeling strength.

 

2. The magnesium oxide produced after combustion and dehydration of magnesium hydroxide is a kind of high-strength and heat-resistant material, which can be used as a protective wall to isolate the fire source and toxic and harmful gases. The neutralization ability of magnesium hydroxide and acid is strong, and it can neutralize the acid gases SO2, NOx, CO2, etc. produced in the process of plastic combustion quickly.

 

3. The decomposition energy of magnesium hydroxide is high, which is good for absorbing the heat of combustion and improving the efficiency of flame retardant.

 

4. Magnesium hydroxide has strong smoke suppression ability, small hardness and small friction to equipment, which is helpful to prolong the life of production equipment.

 

5. Magnesium hydroxide is half of the price of aluminum hydroxide, with large filling volume.

 

Brucite specification

MgO %	SiO2 %	CaO %	Fe2O3 %	Al2O3 %	Loi %
60.62	4.84	2.42	0.32	0.15	31.65
62.59	3.68	2.12	0.29	0.09	31.23
64.36	3.01	1.17	0.28	0.07	31.11
65.13	2.89	1.07	0.26	0.06	30.59
66.20	2.79	1.03	0.24	0.05	29.69