Modification method: Hebei Messi Biology Co., Ltd. stated that under a constant temperature of 80°C, the modifier (2%) solution dispersed in anhydrous ethanol and magnesium hydroxide were mixed into a slurry at a ratio of 1:1.5 and modified for 2 hours. After modification, the modified magnesium hydroxide powder was obtained by filtration, drying at 135°C, and grinding.
Modifier: titanate coupling agent CS-201, CS-311, phosphorus-containing organic flame retardant diphenyl phosphate, dimethyl phosphite, dosage 2%, modification for 2 hours.
Testing and characterization: infrared spectroscopy, thermogravimetry, electron microscopy and particle size, and the prepared modified magnesium hydroxide was added to EVA as a flame retardant to test the material properties.
Modification effect: Titanate coupling agent CS-201, CS-311 and organic flame retardant cresol diphenyl phosphate, dimethyl phosphite modified MH can reduce particle agglomeration and improve particle size dispersion, and the best effect is titanate coupling agent CS-311. Organic flame retardant cresol diphenyl phosphate modified magnesium hydroxide can improve the heat resistance of magnesium hydroxide and quality retention rate at high temperature. Magnesium hydroxide modified by titanate coupling agent CS-311 has the best compatibility with EVA resin and greatly improves elongation at break; magnesium hydroxide modified by cresol diphenyl phosphate has the best flame retardant effect.