Method for preparing binded NdFeB in-situ after injection moulding forming
An in-situ polymerization and injection molding technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of complex process, low bonding strength, uniformity effect of mixing magnetic powder and binder, etc., to simplify The effect of forming process, ensuring sufficient and uniform mixing, and saving investment in granulation equipment
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Example Embodiment
[0025] Example one
[0026] In the first step, in terms of parts by mass, mix 1 part of KH550 and 99 parts of NdFeB magnetic powder uniformly, and then fully dry to coat the surface of the NdFeB magnetic powder;
[0027] In the second step, the caprolactam monomer (CL) is heated to 80°C and melted into a liquid, and then vacuumed to 1×10 -1 Pa in addition to water for 30 minutes;
[0028] The third step is to add 0.15 parts of antioxidant Irganox 1098 and 5 parts of hexamethylphosphoric triamide to 100 parts of the caprolactam melt prepared in the second step under the condition of 0.2Pa high purity nitrogen. (HPT), 2 parts of calcium stearate to make a monomer solution; mix 7 parts of the monomer solution with 93 parts of NdFeB magnetic powder prepared in the first step, stir thoroughly to obtain a mixed system; in 100 parts of a mixed system Add 0.5 parts of toluene diisocyanate (TDI) and 0.8 parts of potassium hydroxide, stir evenly and heat to 150°C and keep it for 5 minutes t...
Example Embodiment
[0030] Example two
[0031] In the first step, in terms of parts by mass, 3 parts of KH550 and 93 parts of NdFeB magnetic powder are mixed uniformly and fully dried to coat the surface of the magnetic powder;
[0032] In the second step, the caprolactam monomer (CL) is heated to 60°C and melted into liquid, and then vacuumed to 1×10 -4 Remove water for 10 minutes;
[0033] In the third step, under the condition of 0.6Pa high-purity nitrogen, add 0.1 part of antioxidant Irganox 1098 and 7 parts of hexamethylphosphoric triamide to 100 parts of the caprolactam melt prepared in the second step by mass parts. (HPT), 1 part of zinc stearate to make a monomer solution; mix 10 parts of the monomer solution with 90 parts of NdFeB magnetic powder prepared in the first step, stir thoroughly to obtain a mixed system; in 100 parts of a mixed system Add 0.3 parts of toluene diisocyanate (TDI) and 0.5 parts of potassium hydroxide, stir evenly and heat to 140°C and keep it for 3 minutes to prepar...
Example Embodiment
[0035] Example three
[0036] In the first step, in terms of parts by mass, mix 5 parts of KH 550 and 95 parts of NdFeB magnetic powder uniformly and then fully dry it to coat the surface of the magnetic powder;
[0037] In the second step, the caprolactam monomer (CL) is heated to 70°C and melted into a liquid, and then vacuumed to 1×10 -3 Remove water for 15 minutes;
[0038] In the third step, under the condition of 0.4Pa high-purity nitrogen; in parts by mass, add 0.3 parts of antioxidant Irganox 1098 and 10 parts of hexamethylphosphoryl three to 100 parts of the caprolactam melt prepared in the second step Amine (HPT) and 0.5 parts of barium stearate are made into a monomer solution; 15 parts of the monomer solution are mixed with 85 parts of the NdFeB magnetic powder prepared in the first step, and the mixture is fully stirred to obtain a mixed system; in 100 parts of the mixed system Add 0.1 part of toluene diisocyanate (TDI) and 0.2 part of potassium hydroxide, stir evenly, ...
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