The thermal stability, particle size and morphology and oil absorption of aluminum hydroxide(ATH) treated by drymodification with three different modifiers were investigated. The experimental results show that the the...The thermal stability, particle size and morphology and oil absorption of aluminum hydroxide(ATH) treated by drymodification with three different modifiers were investigated. The experimental results show that the thermal stability of ATHpowder is markedly improved by dry modification technology with the following modifiers such as phosphoric acid, polyacrylic acidand the mixture of phosphoric acid and polyacrylic acid. The best effect comes from pure phosphoric acid, and the initial temperaturefor the loss of crystal water of ATH powder modified with pure polyacrylic acid can reach about 202 ℃ that is approximately 10 ℃higher than that of ATH powder before modification. The phenomena of agglomeration and macro-aggregate badly exist in ATHpowder modified with the modifiers containing phosphoric acid. The growth of particles and agglomerations of powders are notevident in ATH powder modified with pure polyacrylic acid. The oil absorption of ATH powder modified with the modifierscontaining phosphoric acid is apparently larger than that of original ATH powder and ATH powder modified with pure polyacrylicacid. The oil absorption of the ATH powder modified with pure polyacrylic acid is slightly smaller than that of original ATH powder.展开更多
The dry modification of aluminum hydroxide powders with phosphoric acid and the effects of modification of technological conditions on thermal stability, morphology and oil absorption of aluminum hydroxide powders wer...The dry modification of aluminum hydroxide powders with phosphoric acid and the effects of modification of technological conditions on thermal stability, morphology and oil absorption of aluminum hydroxide powders were investigated. The results show that the increase of mass ratio of phosphoric acid to aluminum hydroxide, the decrease of mass concentration of phosphoric acid and prolongation of mixing time are favorable to the improvement of thermal stability of aluminum hydroxide; when the mass ratio of phosphoric acid to aluminum hydroxide is 5:100, the mass concentration of phosphoric acid is 200 g/L and the mixing time is 10 min, the initial temperature of loss of crystal water in aluminum hydroxide rises from about 192.10 to 208.66 ℃, but the dry modification results in the appearance of agglomeration and macro-aggregate in the modified powders, and the oil absorption of modified powders becomes higher than that of original aluminum hydroxide.展开更多
基金Project(06SK2011) supported by the Science and Technology Program of Hunan Province, China
文摘The thermal stability, particle size and morphology and oil absorption of aluminum hydroxide(ATH) treated by drymodification with three different modifiers were investigated. The experimental results show that the thermal stability of ATHpowder is markedly improved by dry modification technology with the following modifiers such as phosphoric acid, polyacrylic acidand the mixture of phosphoric acid and polyacrylic acid. The best effect comes from pure phosphoric acid, and the initial temperaturefor the loss of crystal water of ATH powder modified with pure polyacrylic acid can reach about 202 ℃ that is approximately 10 ℃higher than that of ATH powder before modification. The phenomena of agglomeration and macro-aggregate badly exist in ATHpowder modified with the modifiers containing phosphoric acid. The growth of particles and agglomerations of powders are notevident in ATH powder modified with pure polyacrylic acid. The oil absorption of ATH powder modified with the modifierscontaining phosphoric acid is apparently larger than that of original ATH powder and ATH powder modified with pure polyacrylicacid. The oil absorption of the ATH powder modified with pure polyacrylic acid is slightly smaller than that of original ATH powder.
基金Project(06SK2011) supported by the Science and Technology Program of Hunan Province, China
文摘The dry modification of aluminum hydroxide powders with phosphoric acid and the effects of modification of technological conditions on thermal stability, morphology and oil absorption of aluminum hydroxide powders were investigated. The results show that the increase of mass ratio of phosphoric acid to aluminum hydroxide, the decrease of mass concentration of phosphoric acid and prolongation of mixing time are favorable to the improvement of thermal stability of aluminum hydroxide; when the mass ratio of phosphoric acid to aluminum hydroxide is 5:100, the mass concentration of phosphoric acid is 200 g/L and the mixing time is 10 min, the initial temperature of loss of crystal water in aluminum hydroxide rises from about 192.10 to 208.66 ℃, but the dry modification results in the appearance of agglomeration and macro-aggregate in the modified powders, and the oil absorption of modified powders becomes higher than that of original aluminum hydroxide.
