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Injection molding preparation method for magnetic composite material in magnetostatic field
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A magnetic composite material, injection molding technology, applied in the direction of magnetism of organic materials/organic magnetic materials, to achieve the effect of cost reduction and simplification of procedures
Inactive Publication Date: 2015-11-11
彭晓领
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Its disadvantages are very obvious. The surface that needs strong magnetism has insufficient magnetism, and the surface that does not need magnetism is too strong.
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[0030] Add 5 parts of ferromagnetic Fe particles to 100 parts of polyethylene and mix evenly at 120°C;
[0031] Step 2) Injection molding in magnetic field
[0032] Inject the raw material into the mold under a certain pressure, the injection temperature is 140°C, apply a static magnetic field at the mold, and the magnetic field strength is 0.01T;
[0033] Step 3) Cooling and demoulding
[0034] After holding the pressure for a period of time, the plastic part is cooled to a certain temperature and the mold can be opened, and the plastic part is pushed out of the mold under the action of the ejection mechanism to obtain the product.
[0037] Add 20 parts of ferromagnetic Co particles to 100 parts of polypropylene and mix evenly at 160°C;
[0038] Step 2) Injection molding in magnetic field
[0039] Inject the raw material into the mold under a certain pressure, the injection temperature is 180°C, apply a static magnetic field at the mold, and the magnetic field strength is 0.1T;
[0040] Step 3) Cooling and demoulding
[0041] After holding the pressure for a period of time, the plastic part is cooled to a certain temperature and the mold can be opened, and the plastic part is pushed out of the mold under the action of the ejection mechanism to obtain the product.
[0044] Add 50 parts of ferromagnetic Ni particles to 100 parts of polystyrene and mix evenly at 180°C;
[0045] Step 2) Injection molding in magnetic field
[0046] Inject the raw material into the mold under a certain pressure, the injection temperature is 200°C, apply a static magnetic field at the mold, and the magnetic field strength is 0.5T;
[0047] Step 3) Cooling and demoulding
[0048] After holding the pressure for a period of time, the plastic part is cooled to a certain temperature and the mold can be opened, and the plastic part is pushed out of the mold under the action of the ejection mechanism to obtain the product.
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Abstract
The invention discloses an injection molding preparation method for a magnetic composite material in a magnetostatic field. The method includes the steps that (1) a mixture of ferromagnetic particles and thermoplastic plastics or a mixture of the ferromagnetic particles, thermosetting plastics and a curing agent is heated to be evenly mixed; (2) the raw materials are injected into a mold under certain pressure, the injection temperature is 140-260 DEG C, the magnetostatic field is applied in the position of the mold, and the magnetic field strength is 0.01-2.0 T; and (3) after pressure maintaining is conducted for a period of time, the mold can be opened when plastic parts are cooled to a certain temperature, the plastic parts are pushed out of the mold under the action of an ejecting mechanism, and accordingly the product is obtained. The method has the advantages that the magnetic composite material is prepared through the mature injection molding method, and the controllable composite material with ingredients being changed continuously can be prepared conveniently within a large thickness range by adjusting the magnetic field strength, the magnetic field gradient and other preparation technological parameters.
Description
technical field [0001] The invention relates to an injection molding preparation method of a magnetic composite material in a static magnetic field, and belongs to the field of material preparation. Background technique [0002] Injection molding plastics are plasticized in the heating barrel of an injection molding machine, and then injected into the cavity of a closed mold by a plunger or a reciprocating screw to form a plastic processing method for products. This method can process products with complex shapes, precise dimensions or inserts, and has high production efficiency. Injection molding is suitable for almost all thermoplastics. Injection molding is also successfully used to mold certain thermoset plastics. Injection molding has a short molding cycle (a few seconds to a few minutes), and the quality of the molded product can range from a few grams to tens of kilograms. It can form molded products with complex shapes, precise dimensions, and metal or non-metal in...
Claims
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Application Information
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