I understandaluminum hydroxideAfter the advantages of flame retardants, it is necessary to master certain methods of use. Only when used in the correct way can certain results be achieved.

1 How to use it alone

When used alone, it should be selected according to the performance requirements of the product. The particle size is closely related to the performance of the composite material. The smaller the particle size, the better the surface fineness and the better the enhancement effect. But when mixing, the greater the viscosity, so be sure to carefully adjust the formula, do a good job of the performance of the balance.

2. How to choose mixed filling with different particle sizes

It must be carried out in an appropriate proportion, and a dense filling must be formed in the polymer system to greatly improve the flame retardant effect. The great advantage of a reasonable compounding system is that it can avoid the settling or floating of the filler, and can also reduce the viscosity of the resin blend under the same amount of filling, which is very conducive to shear dispersion.

3. recommend use of hydrophobic products

After the aluminum hydroxide is refined, the surface area will increase, it is very easy to agglomerate, and the compatibility with the polymer is poor, it is difficult to achieve uniform dispersion, is very affect the processing performance of the material. Hydrophobic typealuminum hydroxideThe interfacial compatibility with the polymer is good, and the coating layer on the surface can produce a bonding reaction with the group of the substrate resin, which can greatly reduce the viscosity of the blend, eliminate the interface stress concentration, and improve the mechanical properties of the composite material.

4. Precautions when using aluminum hydroxide flame retardant

　　aluminum hydroxideFlame retardant is not toxic, has good stability, can not produce toxic gases at high temperatures, but also can reduce the amount of smoke when burning plastic, and the dehydration heat absorption temperature is low, about 235-350 ℃, so the flame retardant effect is significant when the plastic is just beginning to burn. Another feature is that the price is very low and the source is very wide. In China's flame retardant market, it has developed rapidly and will continue to grow at an average annual rate of 5% in the next five years.

One thing to pay attention to here,aluminum hydroxideThe addition amount of flame retardant must be more than 50% to fully show the flame retardant effect. Because the filler is too high, it will definitely affect the compatibility and mechanical properties of polymers and inorganic fillers. Therefore, it is necessary to carry out surface treatment on aluminum hydroxide and mix with other flame retardants to form a practical flame retardant system. As long as the dosage is reduced, the flame retardant effect will be improved, which is part of the modification method.