Preparation of modified magnesium hydroxide and its application in PA66

摘要

In the present study,the modified magnesium hydroxide was prepared by precipitation method using Mg(NO_(3)), NaOH, and silane coupling 702 modifier as raw materials. The optimal reaction conditions were obtained as follows: sodium hydroxide was added to magnesium nitrate solution by dropping, the dropping speed of sodium hydroxide was 2ml/min, the reaction temperature was 60°C, and the ratio of modifier dosage to total solution volume was 7/100(g/ml). The oil absorption value and XRD were used to characterize the modified Mg(OH)_(2). In the application, the modified magnesium hydroxide was mixed with pentaerythritol octahydrogen tetraphosphate(PEPA) and applied to nylon 66(PA66).The flame retardancy and mechanical properties of the nylon 66(PA66)composite were studied.