CN100487830C - Injecting ferrite permanent magnet material formula - Google Patents
Injecting ferrite permanent magnet material formula Download PDFInfo
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- CN100487830C CN100487830C CNB2005100234823A CN200510023482A CN100487830C CN 100487830 C CN100487830 C CN 100487830C CN B2005100234823 A CNB2005100234823 A CN B2005100234823A CN 200510023482 A CN200510023482 A CN 200510023482A CN 100487830 C CN100487830 C CN 100487830C
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Abstract
The invention composed of following component: ferrite magnetic powder, 80.0wt%-95.0wt%; nylon 12, 4.0wt%-20.0wt%; additive, 0.01wt%-3.0wt%; Its feature is:The additive consists of organic outside lubricant and inorganic inner lubricant, which can increase the fluidity of ingredients in tube, reduce decompose and oxidation of nylon 12 and palletizing temperature.
Description
Technical field
The present invention relates to magnetic material, relate in particular to a kind of adopt inorganic in, the injecting ferrite permanent magnet material formula of organic external lubricant.
Background technology
Along with development of high-tech, people are more and more higher to the requirement of electronics and IT products.The electronic information machine product develops to the direction of " light, thin, short, little ".This just has higher requirement to the permanent magnetic material of electronic information industry.Compare with sintered permanent magnet, bonded permanent magnet, particularly the high-performance bonded permanent magnet is because its good mechanical performance, can the various complicated shape products of one-shot forming, do not need to carry out back processing and just can not obtain the high product of dimensional accuracy, can prepare the complicated shape product and can be continuously advantage such as automated production in enormous quantities, just in time satisfied the demand for development of electronic information complete machine " light; thin, short, little ".At present, the world rises steadily to the demand of high-performance permanent magnetism injecting ferrite, and it is widely used in computer, delayer, micro-motor rotor, transducer, instrument and meter, field of consumer electronics such as office equipment.
The bonded ferrite material price is cheap, and has nonconducting characteristic, thereby is applicable to the occasion of high frequency magnetic field, can also different plastics be that base material is made rigidity or flexible product, and product design is more flexible than sintered magnet.The magnetic synthetic material is divided into structural type and compound two kinds.Wherein, compound magnetic material is divided into two big class, thermoplasticity and thermosettings.The thermoplastic magnetic synthetic material can be divided into two classes according to processing method, and a class adopts the magnetic rubber of the processing technology moulding of rubber for being base material with haloflex or acrylonitrile-butadiene rubber etc.; Another kind of is the injection magnet of base material with nylon, polyphenylene sulfide.The magnetic that compound magnetic material is filled is many with ferrite, as BaO6Fe2O3, SrO6FeO etc., also has another kind of magnetic powder material in addition, as SmCo5, NdFeB and samarium iron nitrogen class.At present, the bonded ferrite of extensive use is mainly made binding agent by nylon 6, nylon 12; Nylon 6 is cheap, has stronger flowability, but its intensity is relatively poor, and water absorption is also bigger, thereby cause the magnetic property of product not satisfactory, and useful life is also shorter, and nylon 12 intensity are good, water absorption is little, product stability, and the life-spans etc. all are higher than nylon 6 injecting ferrites.But because nylon 12 is bigger than the volume ratio of nylon 6, lower with the performance of nylon 12 injecting ferrites under the weight ratio condition than the performance of nylon 6 injecting ferrites, and the flowability of nylon 12 is poorer than nylon 6.
As prior art (bright red, processing aid is in the application study of electrical micro-machine with bonded permanent magnet, mining industry, the 7th volume fourth phase, the 59-63 page) the 1-4 page following content is disclosed: bonded permanent ferrite adopts magnetic and macromolecular material complex technique, make this material not only have the characteristic of permanent-magnet ferrite, bonded permanent ferrite adopts magnetic and macromolecular material complex technique, make this material not only have the characteristic of permanent-magnet ferrite material, and have macromolecular material be easy to processing, good moldability, can reuse, leftover pieces are few, the dimensional accuracy height, high conformity and remarkable advantage such as easy to assembly, stress to have discussed the kind and the consumption of the auxiliary agent that in the bonded permanent magnet manufacture process, uses, wherein Chang Yong plasticizer has phthalate, the stearate class, epoxy compounds, the oleate class, the polybasic ester derivative class, the main effect of plasticizer is the Fan Dehuali that weakens between the polymer molecule, thereby increase moving of polymer molecular chain, reduce the crystallinity of polymer molecular chain, increase the plasticity of polymer, the content of plasticizer is 0.8%, 1.0% and 2.0% o'clock effect better; The main type of lubricant has fatty acid acyl amine, aliphatic acid and ester class thereof, metallic soap class and hydro carbons, lubricant can reduce between high polymer material and the processing equipment, between the high polymer interior molecules, the mutual friction mutually between magnetic and the magnetic, between magnetic and the binding agent, external lubrication and internal lubrication are provided, the content of lubricant be 1.2% and 1.8% o'clock effect better; Heat stabilizer commonly used has alkali lead salts, metallic soap class, organic tin and polynary ester class, and the thermal endurance the when adding of heat stabilizer has improved magnet processing and use has prolonged useful life greatly; Because the magnetic surface is a hydrophily, macromolecular material is generally lipophile, between the two in conjunction with difficulty, and coupling agent is the material that a class has the both sexes structure, a part of group in its molecule and the reaction of the chemical group on magnetic surface, form firm chemical bond, another part group and organic substance reaction form physics and twine, thereby magnetic and base material are organically combined, coupling agent commonly used is divided into silanes, titanate ester and organic complex class etc. by chemical constitution, the content of coupling agent be 0.5% and 1.0% o'clock effect better.Though top documents has been mentioned the function of lubricant, but the lubricant of being mentioned all is an external lubricant, and as lubricant mechanism be not only can reduce between high polymer material and the processing equipment, between the high polymer interior molecules, mutual friction mutually between magnetic and the magnetic, between magnetic and the binding agent, iff being the aforesaid lubricant of adding, must add heat stabilizer, significantly reduce the content of magnetic like this, caused the decline of magnetic property.
In order to explore effective solution, people have carried out various trials.For example, change the size of ferrite particle, improve manufacturing process, adjust component of product or the like; Though improved properties of product to a certain extent, all do not obtained significant especially effect
Summary of the invention
The present invention is primarily aimed at prior art when adding lubricant, and the essential heat stabilizer that adds has reduced particle content, causes the decline of magnetic property; A kind of employing inside and outside lubricant agent is provided, and does not adopt the prescription of heat stabilizer, not only lowered the injection mo(u)lding temperature, improved the access times and the utilance of material.Reduced the decomposition and the oxidation of nylon, and, improved the use content of magnetic, improved the performance of particulate material by mobile raising.
It is not high that the present invention also solves product existing in prior technology stability, useful life is shorter, and the technical problem of the not satisfactory grade of magnetic property provides that a kind of to be used to make properties of product stable, the magnetic property height, the prescription of the injecting ferrite permanent magnet material of long service life.
It is very unreasonable that the present invention has solved simultaneously the compatibility of each component of existing in prior technology again, the adhesive strength that adopts is relatively poor, and the technical problem of the bigger grade of water absorption provides a kind of compatibility reasonable, the intensity height of binding agent, the injecting ferrite permanent magnet material formula that water absorption is little.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of injecting ferrite permanent magnet material formula comprises following component: ferromagnetic oxide powder: 80.0wt%～95.0wt%; Nylon 12:4.0wt%～20.0wt%; Additive: 0.01wt%～3.0wt%; It is characterized in that, comprise organic external lubricant and inorganic in-lubricant in the described additive.
Those of ordinary skill thinks that bonded ferrite mainly makees binding agent for 12 two kinds by nylon 6 and nylon, nylon 6 low prices, but intensity is relatively poor, and water absorption is bigger, and nylon 12 intensity are good, and water absorption is little, product stability, the life-span etc. all are higher than nylon 6 injecting ferrites.But because nylon 12 is bigger than the volume ratio of nylon 6, performance with nylon 12 injecting ferrites under the weight ratio condition is lower than the performance of nylon 6 injecting ferrites, and the flowability of nylon 12 is poorer than nylon 6, therefore, mostly use nylon 6 as binding agent in the prior art, even use nylon 12, also can be lower because of the performance of injecting ferrite, and market prospects are relatively poor, and this is a technology barrier.
The inventor also usually enters into such mistaken ideas before this, why magnet performance is poor as binding agent but by nylon 12 that long term studies find to adopt, because the volume ratio of nylon 12 is bigger, mobile performance is poor, cause the decomposition and the oxidation of nylon 12 easily, after adding organic lubricant, can reduce the friction of batching barrel and screw rod when mixing, the adding inorganic lubricant is also made any to the prescription of batching and is adjusted the friction that has reduced between preparing burden and preparing burden, thereby improved the flowability of batching in barrel, raising by flowability, not only significantly reduce the decomposition and the oxidation of nylon 12, improved the use content of magnetic, thereby improved the performance of particulate material, but also can reduce prilling temperature, the injection mo(u)lding temperature; Simplify technological process, improved the life-span of heat proof material.
The used ferromagnetic oxide powder of the present invention can be that the isotropism magnetic also can be an anisotropic magnet powder in addition.The ratio of magnetic and nylon 12 can decide according to the required performance of magnet.The present invention is not particularly limited the granular size of magnetic, and the particle size of general ferromagnetic oxide powder is 0.5 μ m～1.5 μ m.
In order to obtain more good quality production of performance, as preferably, its component is: ferromagnetic oxide powder: 89.0wt%～95.0wt%; Nylon 12:4.0wt%～10.0wt%; Other additive: 0.01wt%～2.5wt%, organic external lubricant 0.01wt%～0.3wt%, inorganic in-lubricant 0.01wt%～0.5wt%.
As preferably, described organic external lubricant is by one or more are formed in fatty acid, amide-type, ester class, alcohols, metallic soap class, the wax class.
As preferably, described inorganic in-lubricant is by one or more are formed in alundum (Al, silicon dioxide, molybdenum bisuphide, the titanium dioxide.
Prior art is thought, use fatty acid acyl amine, aliphatic acid and materials such as ester class, metallic soap class and hydro carbons thereof just can play the effect of external lubrication and internal lubrication, actually this is not so above-mentioned substance is owing to be some organic substances, even metallic soap class, owing to it is the soap that is formed by reactions such as metal oxide or hydroxide and aliphatic acid or rosin acid and aphthenic acids, therefore all can only play the effect of external lubricant; And batching and friction between the batching mainly still are and improve flowability between the batching by inorganic lubricants such as alundum (Al, silicon dioxide, molybdenum bisuphide, titanium dioxide.
As preferably, described other additive is one or more in coupling agent, the plasticizer, and its content is 0.01wt%～3.0wt%.
As preferably, described coupling agent is a silane coupler, titanate coupling agent, one or more in phosphoric acid fat coupling agent and the aluminic acid lipoprotein coupling agent.Preferably contain in the additive of the present invention magnetic is carried out the surface-treated coupling agent, coupling agent can improve compatibility and the compatibility between magnetic class inorganic material and the binding agent organic material, organically is connected by its functional group.The dispersion effect of titanate coupling agent is better, consumption is few, efficient is high, and what are relevant for branch in its action effect and wherein the hydrophobic grouping, and branch is many more, and then effect is good more; And contain in the silane coupler hydrophobic grouping can with the functional group of binding agent generation crosslinked action, with binding agent compatible better, higher with the magnet mechanical strength of treated with same, but its consumption is more relatively.
As preferably, described plasticizer is a dimethanol lipid, aliphatic dibasic acid lipid, polynary alkyd lipid, phosphoric acid lipid, benzene polyacid lipid, in the alkyl sulfonic acid lipid one or more.
The interpolation of above-mentioned plasticizer can further improve nylon 12 and magnetic mixing, the flowability during injection moulding, and the filling rate that improves magnetic improves the magnetic property of magnet then.
In addition, in order to reach comparatively scientific compatibility ratio, as preferably, the consumption of described coupling agent is the 0.3wt%～1.5wt% of ferromagnetic oxide powder weight; Plasticizer dosage is 0.01wt%～2.5wt% that ferrite permanent-magnet materials weight is moulded in injection moulding.
Therefore, the present invention has following advantage: 1, adopt organic external lubricant and inorganic in-lubricant to improve the mobile magnetic of batching in barrel, the decomposition and the oxidation of nylon 12 have not only been significantly reduced, improved the use content of magnetic, thereby improve the performance of particulate material, but also can reduce prilling temperature, the injection mo(u)lding temperature; Simplify technological process, improved the life-span of heat proof material.2, compatibility is reasonable, and the collocation of each component is reasonable, and is easy to make, and need not special apparatus processing; 3, the stable performance of products obtained therefrom, magnetic property height, long service life; 4, the intensity height of binding agent, water absorption is little, helps improving the performance of product; 5, applied range has extensive market prospects; And the process of its processing and fabricating is also comparatively easy, less demanding to equipment.
Embodiment
Below by embodiment and comparative example, technical scheme of the present invention is described in further detail, but the present invention is not limited to these embodiment.
Embodiment 1: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixingly again with the twin-screw mixer machine, make the nylon 12 high-performance injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding.Can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With anisotropy strontium ferrite powder, silane coupler, binding agent nylon 12, organic external lubricant calcium stearate, inorganic in-lubricant alundum (Al.With high-speed mixer it is mixed.
Then, use the twin-screw mixer machine down each formula mixture of forming shown in the table 1 to be carried out the fully mixing nylon 12 high-performance injection moulding permanent-magnet ferrites that obtain at 232 ℃.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 275 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The comparative example 1: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 6 resin content on request through in batch mixer, mixing after the weighing, carry out mixing with the twin-screw mixer machine again, make the nylon 6 injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding, can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With anisotropy strontium ferrite powder, silane coupler, binding agent nylon 6, pure kind antioxidant, lubricant stearic acid calcium mixes it with high-speed mixer.Then, use the twin-screw mixer machine under 252 ℃, each formula mixture to be carried out the fully mixing nylon 6 injection moulding permanent-magnet ferrites that obtain.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 315 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 20 * 8mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The magnetic property of table 1: embodiment 1 comparative example 1 products obtained therefrom and the comparison of tensile strength
Embodiment 2: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixingly again with the twin-screw mixer machine, make the nylon 12 high-performance injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding.Can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With anisotropy strontium ferrite powder, titanate coupling agent, binding agent nylon 12, the magnesium salts of organic external lubricant 12-hydroxy stearic acid, inorganic in-lubricant molybdenum bisuphide mixes it with high-speed mixer.Then, use the twin-screw mixer machine down each formula mixture of forming shown in the table 1 to be carried out the fully mixing nylon 12 high-performance injection moulding permanent-magnet ferrites that obtain at 230 ℃.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 276 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The comparative example 2: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixing with the twin-screw mixer machine again, make the nylon 12 injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding, can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With 340g strontium ferrite powder, 42g binding agent nylon 12, the 2.7g titanate coupling agent mixes it with high-speed mixer.Then, use the twin-screw mixer machine under 260 ℃, each formula mixture to be carried out the fully mixing nylon 12 injection moulding permanent-magnet ferrites that obtain.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 300 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The magnetic property of table 2: embodiment 2 comparative examples 2 products obtained therefroms and the comparison of tensile strength
Embodiment 3: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixingly again with the twin-screw mixer machine, make the nylon 12 high-performance injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding.Can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With anisotropy strontium ferrite powder, silane coupler, binding agent nylon 12, antioxidant, the organic lubricant amides compound, inorganic lubricant molybdenum bisuphide mixes it with high-speed mixer.Then, use the twin-screw mixer machine down each formula mixture of forming shown in the table 1 to be carried out the fully mixing nylon 12 high-performance injection moulding permanent-magnet ferrites that obtain at 228 ℃.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 274 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The comparative example 3: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 11 resin content on request through in batch mixer, mixing after the weighing, carry out mixing with the twin-screw mixer machine again, make the nylon 11 injection moulding permanent-magnet ferrite of designed shape after the granulation by injection mo(u)lding, can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With 92.2% strontium ferrite powder, 5.4% binding agent nylon 11,0.7% amine is silane coupler, 1.5% monobasic hydroxy-acid acid amides mixes it with high-speed mixer.Then, use the twin-screw mixer machine under 240 ℃, each formula mixture to be carried out the fully mixing nylon 11 injection moulding permanent-magnet ferrite that obtains.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Adopt the mode moulding sample of extruded type moulding then.Forming temperature: 340 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10`10.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The magnetic property of table 3: embodiment 3 comparative examples 3 products obtained therefroms and the comparison of tensile strength
Embodiment 4: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixingly again with the twin-screw mixer machine, make the nylon 12 high-performance injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding.Can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With anisotropy strontium ferrite powder, silane coupler, binding agent nylon 12, organic external lubricant EVA, inorganic in-lubricant titanium dioxide mixes it with high-speed mixer.Then, use the twin-screw mixer machine down each formula mixture of forming shown in the table 1 to be carried out the fully mixing nylon 12 high-performance injection moulding permanent-magnet ferrites that obtain at 222 ℃.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 270 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The comparative example 4: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 6 resin content on request through in batch mixer, mixing after the weighing, carry out mixing with the twin-screw mixer machine again, make the nylon 6 injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding, can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With 88.5% strontium ferrite powder, 10.97% binding agent nylon, 6,0.1% silicon are coupling agent, and 0.18% calcium stearate mixes it with high-speed mixer.Then, use the twin-screw mixer machine under 248 ℃, each formula mixture to be carried out the fully mixing nylon 6 injection moulding permanent-magnet ferrites that obtain.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample, forming temperature: 320 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The magnetic property of table 4: embodiment 4 and comparative example's 4 products obtained therefroms and the comparison of tensile strength
Embodiment 5: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixingly again with the twin-screw mixer machine, make the nylon 12 high-performance injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding.Can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With anisotropy strontium ferrite powder, phosphate coupling agent, binding agent nylon 12, organic external lubricant polypropylene wax, inorganic in-lubricant alundum (Al mixes it with high-speed mixer.Then, use the twin-screw mixer machine down each formula mixture of forming shown in the table 1 to be carried out the fully mixing nylon 12 high-performance injection moulding permanent-magnet ferrites that obtain at 225 ℃.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample.Forming temperature: 278 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10 * 10mm.The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The comparative example 5: with ferrite with coupling agent carry out after the surface treatment with binding agent nylon 12 resins content on request through in batch mixer, mixing after the weighing, carry out mixing with the twin-screw mixer machine again, make the nylon 12 injection moulding permanent-magnet ferrites of designed shape after the granulation by injection mo(u)lding, can determine whether according to the character of used magnetic during moulding carrying out magnetic field orientating.
With 92% ferrite powder, 7.9% binding agent nylon, 12,0.1% zinc stearates mix it with high-speed mixer.Then, use the twin-screw mixer machine under 260 ℃, each formula mixture to be carried out the fully mixing nylon 12 injection moulding permanent-magnet ferrites that obtain.Then carry out pelletizing, obtain the particle of average grain diameter 2～4mm.Then at injection moulding machine moulding sample, forming temperature: 310 ℃.Each prescription all adds the alignment magnetic field of 100000e during moulding, and the moulding sample is of a size of 10mm.
The tensile strength of each prescription is under the condition of no alignment magnetic field, according to above-mentioned molding technological condition, and according to ASTM-D638 standard moulding test print, then under the test condition of ASTM-D638 standard code, the tensile strength of testing experiment print.
The magnetic property of table 5: embodiment 5 and comparative example's 5 products obtained therefroms and the comparison of tensile strength
Table 6: each amounts of components (percentage by weight) of embodiment 1-5 injection moulding magnet
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technical staff of the technical field of the invention can do various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used binding agent morely, the possibility of using other term do not got rid of in terms such as coupling agent, lubricant, plasticizer.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (7)
1. an injecting ferrite permanent magnet material formula comprises following component: ferromagnetic oxide powder: 89.0wt%～95.0wt%; Nylon 12:4.0wt%～10.0wt%; Additive: 0.01wt%～2.5wt%, organic external lubricant 0.01wt%～0.3wt%, inorganic in-lubricant 0.01wt%～0.5wt%.
2. injecting ferrite permanent magnet material formula according to claim 1 is characterized in that: described organic external lubricant is by one or more are formed in fatty acid, amide-type, ester class, alcohols, metallic soap class, the wax class.
3. injecting ferrite permanent magnet material formula according to claim 1 and 2 is characterized in that: described inorganic in-lubricant is by one or more are formed in alundum (Al, silicon dioxide, molybdenum bisuphide, the titanium dioxide.
4. injecting ferrite permanent magnet material formula according to claim 1 and 2 is characterized in that: described additive is made up of in coupling agent, the plasticizer one or both.
5. injecting ferrite permanent magnet material formula according to claim 4 is characterized in that described coupling agent is made up of in silane coupler, titanate coupling agent, phosphoric acid fat coupling agent and the aluminic acid lipoprotein coupling agent one or more.
6. injecting ferrite permanent magnet material formula according to claim 4 is characterized in that: described plasticizer is made up of in dimethanol lipid, aliphatic dibasic acid lipid, polynary alkyd lipid, phosphoric acid lipid, benzene polyacid lipid, the alkyl sulfonic acid lipid one or more.
7. according to claim 5 or 6 described injecting ferrite permanent magnet material formulas, it is characterized in that: the consumption of described coupling agent is the 0.3wt%～1.5wt% of ferromagnetic oxide powder weight; Plasticizer dosage is the 0.01wt%～2.5wt% of injecting ferrite permanent magnet material weight.
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| CN102352101A (en) * | 2011-06-08 | 2012-02-15 | 深圳市科聚新材料有限公司 | Plastic magnetic conductive material and preparation method thereof |
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| CN103337325A (en) * | 2012-12-19 | 2013-10-02 | 横店集团东磁股份有限公司 | Nylon ferrite composite magnet device and fabrication method thereof |
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| CN117510991A (en) * | 2022-07-28 | 2024-02-06 | 横店集团东磁股份有限公司 | Functional magnetic powder and preparation method thereof, magnetic nylon master batch and preparation method thereof, and magnetic plastic material |
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