Magnetic particle and its manufacturing method

[0008] Take alnico magnetic powder 40kg, nylon 45kg, magnesium hydroxide 7kg, red phosphorus 5kg, lubricant EBS0.6kg, toning powder TiO 2 Put 2.4kg into the mixer and mix for 2 minutes, then put it into the charging car; then put the mixture into the feed hopper of the screw extruder, the temperature of the heating zone is 215°C, the feeding speed is 1.6m / min, extrude The output speed is 53m / min. After being cooled on the conveyor belt, it is cut into pellets with a diameter of 2mm and a length of 3.5mm with a pelletizer. Then, put the pellets into the injection machine, the temperature is 220°C, and the injection pressure is 76kg / cm 2 , The injection time is 2.5 seconds, the holding time is 5.0 seconds, and the injection is made into a standard flame-retardant sample strip of 30×10×3.2mm for testing.

[0009] The invention is tested by the General Standard Technical Service Co., Ltd., and does not contain hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl...

[0014] Take 75kg of ferrite magnetic powder, 18kg of nylon, 3kg of magnesium hydroxide, 3.5kg of red phosphorus, 0.4kg of lubricant EBS, and toning powder TiO 2 Put 0.1kg into the mixer and mix for 5 minutes, then put it into the charging car; then put the mixture into the feeding hopper of the screw extruder, the temperature of the heating zone is 250°C, the feeding speed is 2m / min, and extruded The speed is 56m / min. After being cooled on the conveyor belt, it is cut into pellets with a diameter of 2mm and a length of 3.5mm with a pelletizer. Then, put the pellets into the injection machine, the temperature is 260°C, and the injection pressure is 93kg / cm 2 , The injection time is 2.5 seconds, the holding time is 5.0 seconds, and the injection is made into a standard flame-retardant sample strip of 30×10×3.2mm for testing.

[0015] The invention is tested by the General Standard Technical Service Co., Ltd., and does not contain hexavalent chromium, polyoxybiphenyl, polybromin...