CN103337325A - Nylon ferrite composite magnet device and fabrication method thereof - Google Patents
Nylon ferrite composite magnet device and fabrication method thereof Download PDFInfo
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- CN103337325A CN103337325A CN2012105569698A CN201210556969A CN103337325A CN 103337325 A CN103337325 A CN 103337325A CN 2012105569698 A CN2012105569698 A CN 2012105569698A CN 201210556969 A CN201210556969 A CN 201210556969A CN 103337325 A CN103337325 A CN 103337325A
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Abstract
The invention relates to the technical field of production of bonding permanent magnetic materials, in particular to a nylon ferrite composite magnet device and a fabrication method thereof. The nylon ferrite composite magnet device is fabricated by mixing the following components by weight percentage: 85-93% of ferrite magnetic powder, 6-14% of nylon, 0.1-1% of montmorillonoid and 0.5-1.5% of processing agent. The nylon ferrite composite magnet device has the advantages that the nylon ferrite composite magnet device is high in tensile strength and high in bending strength, so that the dimensional stability is improved, a water absorption rate and a shrinkage rate of the magnet device are reduced, and warping is reduced.
Description
Technical field
The present invention relates to the binding electromagnetic material production technical field, particularly a kind of nylon ferrite built-up magnet device and preparation method thereof.
Background technology
Bonded permanent magnet is that Magnaglo evenly mixes with binding agents such as resin, plastics or low-melting-point metals, then with mold pressing, extrude or polymer base composite permanent-magnetic material that method such as injection moulding is made, be an important branch in the permanent magnetic material.Used binder material mainly contains 2 classes: polymer (as rubber, thermoplasticity or thermosetting resin) and low-melting-point metal (as Zn, Sn, Cu, AI and alloy thereof etc.).The method of producing magnet with bonding process starts from the later stage sixties 20th century, has compared following characteristics with the magnet that initial casting and powder metallurgic method (claiming sintering process again) are produced:
1. designability is strong, can carry out magnetic property and shape design according to using needs;
2. size and precision height, freedom shape are big, magnet that can a precise forming complicated shape;
3. magnet performance is even, consistent;
4. good mechanical property has very high toughness, not easy to crack and quick-fried angle etc.;
5. can realize mass automatic production, the economic benefit height.
These advantages make bonded permanent magnet be widely used in fields such as computer, electronics industry, auto industry, office automation, household electrical appliance just, become basic material and the magnet device of new high-tech industry.
Wherein bonded ferrite is the type of bonded permanent magnet output maximum.The ferrite bonded permanent magnet be to use ferromagnetic oxide powder and binding resin mixture, its extrusion forming is become the magnet of desirable magnet shape, its forming method adopts compression forming method, injection moulding and extrusion moulding.
Existing nylon ferrite built-up magnet device, be that ferromagnetic oxide powder evenly mixes with some kinds nylon bonded dose (as PA6, PA12), processing aid etc., mixing, granulation, the built-up magnet device magnet device made from injection moulding then is as the CN1645526A disclosure of invention.But shortcomings such as existing nylon ferrite built-up magnet device magnet device is big owing to the nylon water absorption rate, intensity is low, cause magnet device hot strength and bending strength low, magnet device size poor stability also has warping phenomenon, influences the application of magnet device in motor.
Summary of the invention
The objective of the invention is to overcome existing nylon ferrite built-up magnet device above shortcomings, a kind of hot strength height that has is provided, the bending strength height, thereby increase dimensional stability, reduce water absorption rate and the shrinkage of magnet device, reduce the nylon ferrite built-up magnet device that warping phenomenon takes place.
Another object of the present invention is to provide above-mentioned nylon ferrite built-up magnet preparation of devices method.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of nylon ferrite built-up magnet device is mixed and made into by following components in weight percentage: ferromagnetic oxide powder 85%-93%, nylon 6%-14%, imvite 0.1%-1%, processing aid 0.5%-1.5%.
Imvite (MMT) is that a kind of wafer thickness and the interlamellar spacing that China abounds with all is the layer silicate mineral of nano-scale, have that raw material is easy to get, advantage such as cheap, can directly monomer or polymer be inserted between the MMT lattice interlayer that compound organic modification is handled, utilize heat of polymerization or shearing force that the organo montmorillonite (MMT) of stratiform is peeled off into nano unit, and be dispersed in the matrix.MMT is a kind of silicate clay mineral, and its basic structure is to be clipped between two silicon-oxy tetrahedrons by a slice alumina octahedral, the layer structure that forms by sharing oxygen atom.Tradable cation such as Na are arranged between the lamella
+, K
+, Mg
2+Plasma can carry out ion-exchange with some ionic surfactants, can improve the interlayer ion environment, reduces the interlayer surface energy, is conducive to the insertion of polymer molecule, improves the composite performance of material.
Common nylon rigidity, thermal endurance, product size stability under certain external condition is not good, and water absorption is also bigger.Imvite (MMT) modification of nylon 6 is compared with common PA6, and its rigidity, modulus, thermal endurance, machinability all are significantly improved.
The present invention is mixed by the optimum organization with ferromagnetic oxide powder, nylon, imvite and processing aid, the nylon ferrite built-up magnet device that obtains has the hot strength height, the bending strength height, thereby increase dimensional stability, reduce water absorption rate and the shrinkage of magnet device, reduce advantages such as warping phenomenon generation.
As preferably, described ferrite magnetic powder content is 88%-91%.Main can improve flowability, processability is good, magnetic property is high, practical requirement.
As preferably, described nylon content is 9%-12%, and described nylon is nylon 6.Mechanics, the processing characteristics excellence of one side nylon 6, cost is low, satisfies actual requirement, is satisfying mechanics, processing characteristics prerequisite reduction nylon content on the other hand, thereby is improving the bonded permanent magnet magnetic property.
As preferably, described imvite content is 0.2%-0.4%.Imvite is in this content interval, and imvite strengthens best results, and cost is lower.
As preferably, described processing aid comprises plasticizer, coupling agent and lubricant, and by accounting for nylon ferrite built-up magnet device total weight, plasticizer is 0.1%-0.5%, and coupling agent is 0.3%-0.5%, and lubricant is 0.1%-0.5%.
As preferably, by accounting for nylon ferrite built-up magnet device total weight, plasticizer is 0.2%-0.3%, and coupling agent is 0.3%-0.4%, and lubricant is 0.2%-0.3%.Each composition of processing aid is in this content interval, and the composite effect of ferromagnetic oxide powder, imvite and nylon is good, and processing, mobile performance is good, thereby is easy to injection moulding and obtains high-performance magnet device.
As preferably, described plasticizer is selected from one or more in dibutyl phthalate, dioctyl phthalate, the diisooctyl phthalate.
As preferably, described coupling agent is silane coupler or titanate coupling agent.
As preferably, described lubricant is one or more in zinc stearate, dolomol, the oleic acid.
A kind of nylon ferrite built-up magnet preparation of devices method, described preparation method comprises the steps:
(1) nylon is placed in 70-80 ℃ the vacuum drying chamber and dries by the fire 48-50h;
(2) fully dry nylon, ferromagnetic oxide powder, imvite, processing aid stirred in high-speed mixer by weight ratio, melt extrude with double screw extruder 200-280 ℃ then, through cooling, be cut into particulate material;
(3) particulate material is dried by the fire 6-8h in 100-105 ℃ drying box, uses the injection molding machine injection mo(u)lding, and injection temperature is at 280-330 ℃.
The invention has the beneficial effects as follows:
At first, nylon ferrite built-up magnet device of the present invention is compared with existing magnet, mechanical performance indexs such as hot strength, bending strength all significantly improve under same magnetic opaque amount ratio prerequisite, this has increased dimensional stability fully, reduced water absorption rate and the shrinkage of magnet device, reduced warping phenomenon and take place.
Secondly, prior art is in order to improve the method that mechanical property generally adopts increases nylon content, but this unavoidably can cause non magnetic increasing mutually and reduce magnetic property.But adopting montmorillonite of the present invention (MMT) is as amplified medium, in the restricted clearance between MMT nanometer lamella, the motion of nylon segment is restricted, because MMT nanometer lamella plays the enhancing nano effect, thereby has improved intensity and the rigidity of composite material.Therefore the present invention has significantly strengthened mechanical property under the prerequisite that does not reduce magnet device magnetic property.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
Among the present invention, if not refer in particular to, the raw material that adopts and equipment etc. all can be buied from market or this area is commonly used.Method among the following embodiment if no special instructions, is the conventional method of this area.
Embodiment 1:
A kind of nylon ferrite built-up magnet device, ferromagnetic oxide powder, nylon 6, imvite and processing aid are mixed and made into, and specifically see Table 1.
Prepare according to following method:
(1) nylon is placed in 70 ℃ the vacuum drying chamber and dries by the fire 50h;
(2) fully dry nylon, ferromagnetic oxide powder, imvite, processing aid stirred in high-speed mixer by weight ratio, melt extrude with double screw extruder 200-280 ℃ then, through cooling, be cut into particulate material;
(3) particulate material is dried by the fire 8h in 100 ℃ drying box, uses the injection molding machine injection mo(u)lding, and injection temperature is at 280-330 ℃.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Embodiment 2:
A kind of nylon ferrite built-up magnet device, ferromagnetic oxide powder, nylon 6, imvite and processing aid are mixed and made into, and specifically see Table 1.
Prepare according to following method:
(1) nylon is placed in 80 ℃ the vacuum drying chamber and dries by the fire 48h;
(2) fully dry nylon, ferromagnetic oxide powder, imvite, processing aid stirred in high-speed mixer by weight ratio, melt extrude with double screw extruder 200-280 ℃ then, through cooling, be cut into particulate material;
(3) particulate material is dried by the fire 6h in 105 ℃ drying box, uses the injection molding machine injection mo(u)lding, and injection temperature is at 280-330 ℃.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Embodiment 3:
A kind of nylon ferrite built-up magnet device, ferromagnetic oxide powder, nylon 6, imvite and processing aid are mixed and made into, and specifically see Table 1.
Prepare according to following method:
(1) nylon is placed in 70 ℃ the vacuum drying chamber and dries by the fire 48h;
(2) fully dry nylon, ferromagnetic oxide powder, imvite, processing aid stirred in high-speed mixer by weight ratio, melt extrude with double screw extruder 200-280 ℃ then, through cooling, be cut into particulate material;
(3) particulate material is dried by the fire 6h in 105 ℃ drying box, uses the injection molding machine injection mo(u)lding, and injection temperature is at 280-330 ℃.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Embodiment 4 ~ embodiment 10
The method for preparing nylon ferrite built-up magnet device of embodiment 4 ~ embodiment 10 is identical with embodiment 3, and difference is the constituent difference of built-up magnet device, and composition is shown in Table 1 in detail.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
The ratio of each ingredients constitute nylon ferrite built-up magnet device total weight of embodiment 1-10 processing aid sees Table 3.
Comparative example 1
This comparative example is with the difference of embodiment 1:
This comparative example is adopting montmorillonite not, and adopts 10.1% nylon 6 by weight;
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Find out with the performance of comparative example 1 from embodiment 1: the magnet device hot strength of embodiment 1 has improved 30.9% than the magnet device hot strength of comparative example 1; The magnet device bending strength of the magnet device bending strength ratio comparative example 1 of embodiment 1 has improved 41.4%; The size of embodiment 1 and precision are Φ 23.4 ± 0.06* Φ 10.2 ± 0.04, and the size of comparative example 1 and precision are Φ 23.4 ± 0.10* Φ 10.2 ± 0.08.Illustrate that adopting montmorillonite of the present invention can significantly improve mechanical properties such as hot strength in same magnetic opaque amount ratio, bending strength as amplified medium, increased dimensional stability fully, thereby reduced water absorption rate and the shrinkage of magnet device, reduced warping phenomenon and take place.
Comparative example 2
This comparative example is with the difference of embodiment 1:
Ferromagnetic oxide powder 94%, nylon 6 5%, imvite 0.2% and processing aid 0.8%(specifically see Table 3) be mixed and made into.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Find out with the performance of comparative example 2 from embodiment 1: the magnet device hot strength of embodiment 1 has improved 124% than the magnet device hot strength of comparative example 2; The magnet device bending strength of the magnet device bending strength ratio comparative example 2 of embodiment 1 has improved 70.3%; The size of embodiment 1 and precision are Φ 23.4 ± 0.06* Φ 10.2 ± 0.04, and the size of comparative example 2 and precision are Φ 23.4 ± 0.14* Φ 10.2 ± 0.10; The table magnetic of embodiment 1 is 1650Gs, and the table magnetic of comparative example 2 is 1600Gs.This explanation is when the ferrite magnetic powder content surpasses the scope of claim of the present invention, hot strength, the bending strength of magnet device sharply worsen, magnet size of devices precision can not satisfy the properties of product requirement, magnet device table magnetic is also very low, this is because excessive magnetic can't finely be mediated with a small amount of nylon, poor processability, and magnetic be orientated when moulding that difficulty causes.
Comparative example 3
This comparative example is with the difference of embodiment 1:
Ferromagnetic oxide powder 84%, nylon 6 15%, imvite 0.3% and processing aid 0.7%(specifically see Table 3) be mixed and made into.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Find out with the performance of comparative example 3 from embodiment 1: the hot strength of comparative example 3, bending strength, size and precision are all than embodiment 1 excellence; But the table magnetic of embodiment 1 is 1650Gs, and the table magnetic of comparative example 3 only is 1536Gs, does not satisfy the properties of product requirement far away.This explanation is when nylon content surpasses the scope of claim of the present invention, and excessive nylon increases the non magnetic phase of magnet device, causes magnet device magnetic property to worsen.
Comparative example 4
This comparative example is with the difference of embodiment 9:
Ferromagnetic oxide powder 89%, imvite 1.2%,
Nylon and processing aid content are identical.
Results of property such as the hot strength of magnet device, bending strength, size and precision, table magnetic are shown in Table 2.
Find out with the performance of comparative example 4 from embodiment 9: the magnet device hot strength of embodiment 9 has improved 95% than the magnet device hot strength of comparative example 4; The magnet device bending strength of the magnet device bending strength ratio comparative example 4 of embodiment 9 has improved 45.1%; The size of embodiment 9 and precision are Φ 23.4 ± 0.07* Φ 10.2 ± 0.05, and the size of comparative example 4 and precision are Φ 23.4 ± 0.12* Φ 10.2 ± 0.09; The table magnetic of embodiment 9 is 1656Gs, and the table magnetic of comparative example 4 is 1595Gs.This explanation is when imvite content surpasses the scope of claim of the present invention, the hot strength of magnet device, bending strength do not improve on the contrary and sharply worsen, magnet size of devices precision far can not satisfy the properties of product requirement, this is because the effect of reuniting, excessive imvite can not form good dispersion in nylon 6-ferromagnetic oxide powder compound system, cause hot strength and bending strength to descend on the contrary.In addition, excessive imvite adds the deterioration processing characteristics, and particulate material is mobile poor in process of injection molding, and magnetic is difficult for orientation, causes the table magnetic of magnet device to improve.
Table 1
Table 2
Table 3
In the table 3: dibutyl phthalate (DBP), dioctyl phthalate (DOP), diisooctyl phthalate (DIOP).DIOP+ DOP presses the weight proportion of 1:1, and DBP+ DOP presses the weight proportion of 1:1.KH550, KH560, KH792 etc. are the commercially available prod.Zinc stearate+dolomol is pressed the weight proportion of 1:1.
Above-described embodiment is a kind of preferable scheme of the present invention, is not that the present invention is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.
Claims (10)
1. a nylon ferrite built-up magnet device is characterized in that: be mixed and made into by following components in weight percentage: ferromagnetic oxide powder 85%-93%, nylon 6%-14%, imvite 0.1%-1%, processing aid 0.5%-1.5%.
2. nylon ferrite built-up magnet device according to claim 1, it is characterized in that: described ferrite magnetic powder content is 88%-91%.
3. nylon ferrite built-up magnet device according to claim 1, it is characterized in that: described nylon content is 9%-12%, described nylon is nylon 6.
4. nylon ferrite built-up magnet device according to claim 1, it is characterized in that: described imvite content is 0.2%-0.4%.
5. according to claim 1 or 2 or 3 or 4 described nylon ferrite built-up magnet devices, it is characterized in that: described processing aid comprises plasticizer, coupling agent and lubricant, by accounting for nylon ferrite built-up magnet device total weight, plasticizer is 0.1%-0.5%, coupling agent is 0.3%-0.5%, and lubricant is 0.1%-0.5%.
6. nylon ferrite built-up magnet device according to claim 5, it is characterized in that: by accounting for nylon ferrite built-up magnet device total weight, plasticizer is 0.2%-0.3%, and coupling agent is 0.3%-0.4%, and lubricant is 0.2%-0.3%.
7. nylon ferrite built-up magnet device according to claim 5, it is characterized in that: described plasticizer is selected from one or more in dibutyl phthalate, dioctyl phthalate, the diisooctyl phthalate.
8. nylon ferrite built-up magnet device according to claim 5, it is characterized in that: described coupling agent is silane coupler or titanate coupling agent.
9. nylon ferrite built-up magnet device according to claim 5, it is characterized in that: described lubricant is one or more in zinc stearate, dolomol, the oleic acid.
10. nylon ferrite built-up magnet preparation of devices method, it is characterized in that: described preparation method comprises the steps:
(1) nylon is placed in 70-80 ℃ the vacuum drying chamber and dries by the fire 48-50h;
(2) fully dry nylon, ferromagnetic oxide powder, imvite, processing aid stirred in high-speed mixer by weight ratio, melt extrude with double screw extruder 200-280 ℃ then, through cooling, be cut into particulate material;
(3) particulate material is dried by the fire 6-8h in 100-105 ℃ drying box, uses the injection molding machine injection mo(u)lding, and injection temperature is at 280-330 ℃.
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| CN109438974A (en) * | 2018-10-23 | 2019-03-08 | 北矿科技股份有限公司 | It is a kind of to prepare injecting ferrite additive and a kind of injecting ferrite and preparation method thereof |
| CN112349470A (en) * | 2020-11-05 | 2021-02-09 | 成都银河磁体股份有限公司 | Injection molding magnet material, injection molding magnet and preparation method thereof |
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