Aluminum hydroxide powder with flame retardant, smoke elimination, filling and other multiple functions, can produce synergistic flame retardant effect with phosphorus and other substances, is a wide range of chemical products, has become electronic, chemical, cable, plastics, rubber and other industries in the important environmental protection flame retardant. Aluminum hydroxide as a filler inorganic flame retardant, in order to achieve a better flame retardant effect, the filling amount needs 40%, even up to 60%, but the high filling amount not only seriously affects the mechanical properties of products, and the extrusion and processing properties become worse. Therefore, surface modification is necessary.
Select different surface modifiers and different amounts of modifiers for wet surface modification of aluminum hydroxide. Through the oil absorption value of aluminum hydroxide powder before and after modification, the surface properties of modified aluminum hydroxide powder have changed obviously, the hydrophilicity and oil absorption value decreased significantly, and the dispersion in the organic phase increased obviously. The surface modification also has an effect on the properties of the aluminum hydroxide composite system. The flame retardation and enhancement mechanism of the superfine activated aluminum hydroxide were analyzed by thermogravimetric analysis and scanning electron microscopy. The surface modification can significantly improve the comprehensive properties of the aluminum hydroxide filled PVC system. Several organic compounds were selected to modify the surface of alumina hydroxide powder. Through the analysis of the oil absorption value, activation degree and particle size of the modified powder, the organic modification made the particle size of alumina hydroxide powder smaller. The chemical bonding method instead of the traditional physical coating method can improve the dispersion stability and compatibility of nano-hydroxide flame retardant in organic polymers.
Regardless of the method of aluminum hydroxide modification, you can use the powder surface modification machine honeycomb grinding, honeycomb grinding modification process is a kind of efficient wind sweep system, material through the air flow to the system to change the characteristics, the minimum handling capacity of 0.05 tons/hour, the maximum of 15 tons/hour.
Post time: May-09-2023