CN103489558B - Injection moulding is composition, injection moulding pellet and preparation method for pellet - Google Patents
Injection moulding is composition, injection moulding pellet and preparation method for pellet Download PDFInfo
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Abstract
The present invention relates to injection moulding composition, injection moulding pellet and preparation method for pellet. Meter by weight, said composition comprises: magnetic 90-95 part, comprises polymeric blends 4-9.5 part of polypropylene and maleic anhydride inoculated polypropylene, coupling agent 0.01-3.0 part and/or diffusant 0.01-3.0 part, and releasing agent 0.1-3.0 part; Wherein, in described polymeric blends, maleic anhydride inoculated polypropylene accounts for the more than 40% of polymeric blends gross weight. Gained injection moulding pellet magnetic property is improved, and cost is minimized.
Description
Technical field
The present invention relates to injection moulding field, relate in particular to maleic anhydride inoculated polypropylene injection moulding pellet.
Background technology
Injection moulding metal and injecting magnetic are twentieth centurys 70 and come across the U.S., Russia and moral the eightiesThe new material of state, by synthesizing after pellet with plastic tie, then solves metal dust and magnetic through injection mouldingThe problem of the difficult moulding of powder. Normally used bonding agent has polyamide, polyphenylene sulfide, wax, polyurethane withPolystyrene.
The production technology of injecting magnetic is two steps, and the first step is to manufacture pellet, and second step is injection mo(u)lding.Injection moulding metal also has a degreasing sintered technique after this two step. Manufacture the technique of pellet and be magnetic orMetal powder and plastics combine under HTHP, and plastics need to be combined closely with powder, by powderEnd is coated. Generally inorganic metal powder and organic plastics (or resin) are to be difficult to combination. SoThe problem that plastic-metal powder pellet need to solve is how in conjunction with these two kinds of distinct materials. LogicalAfter trial for many years, the plastic material using in final industry is polyphenylene sulfide, and polyamide 12 is with poly-Acid amides 6. Wherein polyphenylene sulfide and polyamide 12 have good humidity effect. Although polyamide 6Cost low (30 to 40 yuan of per kilograms), but because its 24 hours water absorption rates are up to 3%, oftenUsed in low side industry by people. For easy oxidation metal powder (as neodymium iron boron, iron core, silicon steel etc.),Polyamide 6 cannot use.
Summary of the invention
The fusing point of polyphenylene sulfide and polyurethane etc. is high, conventionally need to heat and exceed 260 DEG C, very when injection mouldingTo more than 300 DEG C just guaranteeing mobility. Due to the dystectic characteristic of above plastics, cause nano doublePhase Nd-Fe-B iron three boron magnetic powders (or nano double phase Nd-Fe-B α ferromagnetic powder) anisotropic properties cannot be producedRaw. Technical problem to be solved by this invention is: overcome for example nanometer two-phase neodymium iron of existing magnetic powder materialFerro-boron three boron magnetic powders (or nano double phase Nd-Fe-B α ferromagnetic powder) anisotropic properties can not be noted in traditionMould the defect keeping under the condition of molding of magnetic plastics, a kind of injection moulding composition, injection moulding for pellet is providedPellet and preparation method, gained injection moulding pellet magnetic property is improved, and cost is minimized.
In order to solve the problems of the technologies described above, the first technical scheme of employing is: a kind of injection moulding pellet groupCompound, meter by weight, said composition comprises: magnetic 90-95 part, comprises polypropylene and MalaysiaPolymeric blends 4-9.5 part of anhydride-grafted polypropylene, coupling agent 0.01-3.0 part and/or diffusant0.01-3.0 part, and releasing agent 0.1-3.0 part; Wherein, maleic anhydride in described polymeric blendsGraft polypropylene accounts for the more than 40% of polymeric blends gross weight.
Aforesaid injection moulding pellet composition, meter by weight, said composition comprises: magnetic 90-95Part, comprise polymeric blends 4-9.5 part of polypropylene and maleic anhydride inoculated polypropylene, coupling agent0.02-1.0 part, diffusant 0.02-1.0 part, and releasing agent 0.2-1.0 part; Wherein, described polymerizationIn thing mixture, maleic anhydride inoculated polypropylene accounts for the more than 70% of polymeric blends gross weight.
Aforesaid injection moulding pellet composition, described magnetic is nano double phase Nd-Fe-B iron three boron magnetic powdersThe mixture of (and/or nano double phase Nd-Fe-B α ferromagnetic powder) and ferromagnetic oxide powder, wherein nanometer two-phaseNeodymium iron boron iron three boron magnetic powders (and/or nano double phase Nd-Fe-B α ferromagnetic powder) account for 10% of magnetic gross weightAbove. Said mixture refers to mixing of nano double phase Nd-Fe-B iron three boron magnetic powders and ferromagnetic oxide powderThing, the mixture of nano double phase Nd-Fe-B α ferromagnetic powder and ferromagnetic oxide powder, or nano double phase Nd-Fe-BThe mixture of iron three boron magnetic powders, nano double phase Nd-Fe-B α ferromagnetic powder and ferromagnetic oxide powder.
Aforesaid injection moulding pellet composition, described coupling agent is silane coupler or titanate esters couplingAgent; Described releasing agent is Tissuemat E or stearmide; Described diffusant is calcium stearate, stearic acidZinc or sulfoacid calcium.
The second technical scheme adopting is: a kind of injection moulding pellet, by above-mentioned any composition through extruding,Pelletizing is prepared from.
The 3rd technical scheme adopting is: a kind of preparation method of injection moulding pellet, comprises the following steps:
1) mix
Following substances is mixed to get and is extruded with mixture: magnetic 90-95 part, comprises polypropylene and MalaysiaPolymeric blends 4-9.5 part of anhydride-grafted polypropylene, coupling agent 0.01-3.0 part and/or diffusant0.01-3.0 part, and releasing agent 0.1-3.0 part; Wherein, maleic anhydride inoculated polypropylene accounts for and comprises poly-thirdThe more than 40% of polymeric blends gross weight of alkene and maleic anhydride inoculated polypropylene;
2) extrude, pelletizing
Step 1) gained mixture is added in extruder and extruded, and extruder temperature is set to140-260 DEG C (preferably 160-220 DEG C); Then pelletizing.
Aforesaid preparation method, 1) before blend step, further comprise powder process step: will wrapDraw together the mixture of polypropylene and maleic anhydride inoculated polypropylene and make powdery.
Aforesaid preparation method, described magnetic is nano double phase Nd-Fe-B iron three boron magnetic powders or nanometer two-phaseAt least one in neodymium iron boron α ferromagnetic powder, and the mixture of ferromagnetic oxide powder, wherein nanometer two-phase neodymiumIron ferro-boron three boron magnetic powders or nano double phase Nd-Fe-B α ferromagnetic powder account for the more than 10% of magnetic gross weight.
The 3rd technical scheme adopting is: a kind of injection moulding pellet, is prepared from by above-mentioned any method.
The beneficial effect that injection moulding pellet of the present invention is realized has the following aspects.
1. significantly reduce costs and improve performance
The corrosion-resistant moisture resistance plastics that injecting magnetic pellet uses are now polyphenylene sulfide and polyamide 12 (customsClaim nylon 12). And the cost of these two plastics is approximately all in the scope of 150 to 180 yuan of per kilograms.The present invention can provide the performance approximate with them, and its cost is only 12 to 14 yuan of per kilograms.
Nano double phase Nd-Fe-B iron three boron magnetic powders (or nano double phase Nd-Fe-B α ferromagnetic powder) are only being taken the photographFollowing its anisotropic character that just can reflect of family name's 240 degree. Due to polypropylene and maleic anhydride graft poly-thirdAlkene can provide good mobility in 180 to 240 degree scopes Celsius, and it can ensure nanometer two-phase neodymiumIron ferro-boron three boron magnetic powders (or nano double phase Nd-Fe-B α ferromagnetic powder) are connecing with polypropylene and maleic anhydrideBranch polypropylene is combined into after pellet, in Shooting Technique, is fully orientated. With polyphenylene sulfide or polyamide grainMaterial (is filled out with same nano double phase Nd-Fe-B iron three boron magnetic powders and/or nano double phase Nd-Fe-B α ferromagnetic powderFill volume ratio) to compare, this pellet is lifted at 6%～8% to magnetic property (remanent magnetism and HCJ)Scope.
2. reduce finished weight
The light specific gravity of gained pellet of the present invention, proportion is conventionally all below 6.0g/cm3. This is for a lotShould be used for saying and can reduce gross weight. In the brushless electric machine of tributary, can also reduce rotor weight,Thereby reducing inertia also makes to start faster.
3. eliminate eddy current effect
The use of sintering permanent magnet in motor using of comparing, due to polypropylene that the present invention makes and horseMaleic anhydride grafted polypropylene is insulating materials, and after granulation, it can guarantee the insulation between metal dust, DuElectric current between magnetic absolutely, thus eddy current effect eliminated, reduce motor operational temperature.
Brief description of the drawings
Nothing
Detailed description of the invention
Describe in detail with following example as follows, but, one skilled in the art will appreciate thatProtection scope of the present invention should not be confined to this.
A kind of injection moulding pellet composition, meter by weight, said composition comprises: magnetic 90-95Part, comprise polymeric blends 4-9.5 part of polypropylene and maleic anhydride inoculated polypropylene, coupling agent0.01-3.0 part and/or diffusant 0.01-3.0 part, and releasing agent 0.1-3.0 part; Wherein, described poly-In compound mixture, maleic anhydride inoculated polypropylene accounts for the more than 40% of polymeric blends gross weight.
Preferably, meter by weight, said composition comprises: magnetic 90-95 part, comprises polypropyleneWith polymeric blends 4-9.5 part of maleic anhydride inoculated polypropylene, coupling agent 0.02-1.0 part, expandPowder 0.02-1.0 part, and releasing agent 0.2-1.0 part; Wherein, Malaysia in described polymeric blendsAnhydride-grafted polypropylene accounts for the more than 70% of polymeric blends gross weight.
Magnetic be nanometer (domain diameter is in 10-200 nanometer range) two-phase neodymium iron boron iron three boron magnetic powders (with/ or nano double phase Nd-Fe-B α ferromagnetic powder) and the mixture of ferromagnetic oxide powder, wherein nanometer two-phase neodymium ironFerro-boron three boron magnetic powders (and/or nano double phase Nd-Fe-B α ferromagnetic powder) account for magnetic gross weight 10% withOn. Other metal powder or soft magnet powder, permanent magnetism powder also can be applied to the present invention, for example neodymium-iron-boronPowder, aluminium-nickel-cobalt magnetic powder, samarium-cobalt magnetic powder, Fe-Si-Al magnetic, nickel core magnetic, zinc powder, silicon-steel powder, noThe materials such as rust comminuted steel shot and straight iron powder.
The present invention's nano double phase Nd-Fe-B used iron three boron magnetic powders, its permanent magnetism is neodymium iron boron mutuallyRe2Fe14B1, its soft magnetism is iron three boron Fe mutually3B1, it can commercially obtain. Its Re is rare earth elementComprise all lanthanide rares. These nano double phase Nd-Fe-B iron three boron magnetic powders comprise:
1) rare earth (lanthanide series rare-earth elements)=9%～15% weight ratio
2) boron=2%～7% weight ratio
3) zirconium=0%～5% weight ratio
4) silicon=0%～5% weight ratio
5) iron=surplus
6) microcosmic element has Cr, Co, and Cu, Al, Ti, the elements such as Ca, but ratio is very low.
In the time that content of rare earth is many, permanent magnetism phase Nd-Fe-B PrNd2Fe14B1Can be many, soft magnetism phase iron threeBoron Fe3B1Can be few, the boron now needing has also reduced, thus remanent magnetism can decline, and coercivity can rise.In the time that content of rare earth is few, permanent magnetism phase Nd-Fe-B PrNd2Fe14B1Can be few, soft magnetism phase iron three boron Fe3B1Can be many, the boron now needing has also increased, thus remanent magnetism can rise, and coercivity can decline. For example existIn an embodiment, the remanent magnetism of magnetic after orientation is 10500 Gausses (Gauss), intrinsic rectifyingStupid power is 3500Oe. Its remanent magnetism not being orientated is 9800 Gausses (Gauss), and HCJ is3300Oe. HCJ of the present invention instigates the remanent magnetization of magnet to reduce to zero required applyingOpposing magnetic field intensity.
The present invention's ferromagnetic oxide powder used is SrO6Fe2O3, also can be written as SrFe12O19. Respectively toOpposite sex injecting ferrite magnetic all can be applicable to the present invention.
Nano double phase Nd-Fe-B iron three boron magnetic powders be a kind of have high magnetic flux low-cost advantage respectively to differentProperty material, and its anisotropy only just shows below at 240 DEG C. Traditional injection moulding magnetic granular materialBinding material is polyphenylene sulfide or polyamide. These two kinds of plastics respectively will be more than 300 and 260 DEG CThe mobility having had, thus cannot bring into play the anisotropy advantage of neodymium iron boron iron three boron after orientation.The present invention is used in combination nano double phase Nd-Fe-B iron three boron magnetic powders and ferromagnetic oxide powder, guarantee magnetic propertyMeanwhile, reduced cost. In order to ensure magnetic property, nano double phase Nd-Fe-B iron of the present invention three boron magnetic powders(and/or nano double phase Nd-Fe-B α ferromagnetic powder) accounts for the more than 10% of magnetic gross weight, with nano doubleThe increase of phase Nd-Fe-B iron three boron magnetic powder weight, magnetic property increases.
The present invention's resin used is the polymeric blends of polypropylene and maleic anhydride inoculated polypropylene. ThisInventing polypropylene used and maleic anhydride inoculated polypropylene is conventional commercially available material, and conventional injection moulding pellet is usedPolypropylene all can be applicable to the present invention. Maleic anhydride inoculated polypropylene refer to polypropylene, maleic anhydride,Initator (for example dicumyl peroxide) blending extrusion under certain condition, nonpolar molecule masterOn chain polypropylene, introduce the side group maleic anhydride of polarity, the preferred maleic anhydride graft of the present invention poly-thirdAlkene is that percent grafting is 0.8-1.0%, melt index (190 DEG C, 2.16Kg): 50-80g/10min. Poly-In compound mixture, maleic anhydride inoculated polypropylene accounts for the more than 40% of polymeric blends gross weight, withThe increase of maleic anhydride inoculated polypropylene content, mobile performance increases, better effects if. Shown in following table, beThe Performance Ratio of several polymeric materials.
Coupling agent can be silane coupler or titanate coupling agent. Conventional silane coupler or metatitanic acidEster coupling agent all can be applied to the present invention, and preferred silane coupler is(CH3O)3SiC3H6OCH2CH-CH2Or (C2H5O)3SiC3H6NHC2H4NH2Or(C2H5O)3SiC3H6NH2. Preferred titanate esters is isopropyl two oleic acid acyloxy (dioctyl phosphoric acid acylsAmido) titanate esters or isopropyl three (dioctyl phosphoamide base) titanate esters. Coupling agent can allow magnetic withOrganic plastics combination, its strand one end is connected with magnetic, and one end is connected with plastics in addition, therebyPlay coupled action.
Diffusant can be calcium stearate, zinc stearate or sulfoacid calcium. Diffusant is by the bag to magneticCover, prevent from interconnecting between powder, guarantee that powder can spread apart in plastics. In order to reach diffusionEffect, its strand one end be also with metal covering produce be connected, and its remaining strand can with mouldMaterial produces reaction. Diffusant can also better ensure the distance between magnetic powder particle and particle, energy like thisEnough reduce the friction between magnetic and magnetic, thereby make to be orientated do easier.
Releasing agent can be Tissuemat E or stearmide. Releasing agent, can be from pellet in the time of injection mo(u)ldingThe surface of moulding is gone in inside, and by its lubrication, moulding can be easy to from mould the insideBe ejected. Conventional Tissuemat E and stearmide all can be applicable to the present invention.
The preparation method of injection moulding pellet of the present invention, comprises the following steps:
By above-mentioned each material after evenly mixing by being extruded as pellet. Mixing can be used stirringMachine, the equipment such as mixing roll reach uniform stirring effect. In order to make it reach better mixing, polypropylene,First maleic anhydride inoculated polypropylene and other granular organic matter can be milled to powdering. Do not grindOrganic matter also can directly use. After organic matter evenly mixes with inorganic matter, they are put into and are extrudedMachine is extruded. Extruder has single screw extrusion machine and double screw extruder.
The concrete granulation flow process of preparing injection moulding pellet of the present invention is as follows:
1) mix
Following substances is mixed to get and is extruded with mixture: magnetic 90-95 part, comprises polypropylene and MalaysiaPolymeric blends 4-9.5 part of anhydride-grafted polypropylene, coupling agent 0.01-3.0 part and/or diffusant0.01-3.0 part, and releasing agent 0.1-3.0 part; Wherein, maleic anhydride inoculated polypropylene accounts for and comprises poly-thirdThe more than 40% of polymeric blends gross weight of alkene and maleic anhydride inoculated polypropylene;
2) extrude, pelletizing
Step 1) gained mixture is added in extruder and extruded, and extruder temperature is set to140-260 DEG C (preferably 160-220 DEG C); Then pelletizing. Pellet after extruding is noodles shape, faceBar can directly carry out thermal cutting at head, carries out Mechanical Crushing after also can be cooling in Material disintegrator.
1) before blend step, further comprise powder process step: will comprise polypropylene and maleic acidThe mixture of acid anhydride graft polypropylene is made powdery.
The present invention's extruder used is conventional commercially available single screw rod or double screw extruder, due to twin-screw energyProvide shearing force, preferably double screw extruder. The bringing-up section of extruder used can be 2 sections or more than.
The present invention is taking the mixture of polypropylene and maleic anhydride inoculated polypropylene as main adhesives, withMagnetic or metal dust combination, make injection moulding pellet through granulation. In combination, polypropylene and maleic acidThe mixture of acid anhydride graft polypropylene reaches completely coated to magnetic or metal dust, thereby in hot environment(180 to 260 DEG C) bring good mobility, facilitate its injection mo(u)lding, and after injection moulding is coolingApplication of temperature (40 to 150 DEG C)) there is good cementability and mechanical performance.
The fusing point of the mixture of polypropylene and maleic anhydride inoculated polypropylene is low, can be at 180～260 DEG CGood mobility is provided, thereby magnetic (nano double phase Nd-Fe-B iron three boron magnetic powders and/or receive are providedMeter Shuan Xiang neodymium iron boron α ferromagnetic powder) orientation ideal temperature and flox condition. Compare polyphenylene sulfide or poly-Acid amides pellet can promote 6%～8% magnetic property (remanent magnetism and HCJ) after Lijection orientation.
The pellet of this technique manufacture has good mobility and mechanical strength. Exist for serviceability temperature150 DEG C of following working environments, can substitute the injection mouldings such as polyamide 12 injecting magnetic pellets and polyphenylene sulfideMagnetic/metal pellet.
The effect of this patent
The first core effect of the present invention reduces pellet cost exactly. Polypropylene/maleic anhydride graft poly-thirdThe market price of alkene is greatly about 12 to 14 yuan of per kilograms. Polyamide 12 and polyphenylene sulfide under comparingEther is 150～180 yuan of per kilograms.
The second core effect of the present invention can promote magnetic property 6%～8% exactly. Nanometer two-phase neodymium ironFerro-boron three boron magnetic powders only could be orientated below 240 DEG C, and polyamide 12 and polyphenylene sulfide need to beMore than 260 and 280 DEG C just there is good mobility. Due to polypropylene/maleic anhydride inoculated polypropyleneThere is good mobility at 180～260 DEG C, thereby guarantee that anisotropic magnet powder can be abundant in this temperatureOrientation, maximum its magnetic property of performance.
Embodiment
The raw material using in embodiment is as follows:
Table 1
Embodiment 1
1) powder process step
Polypropylene 3.5kg and maleic anhydride inoculated polypropylene 3.5kg made respectively to powdery.
2) mix
Following substances is mixed to get and is extruded with mixture:
3) extrude, pelletizing
By step 2) gained mixture adds in extruder and extrudes, and extruder concrete technology is:Double screw extruder, screw diameter is 55mm, containing 9 temperature control regions, temperature control is electrical heating and waterCold. The extrusion temperature setting of this pellet starts from feeding zone until head is 180 DEG C, and 200 DEG C, 210DEG C, 220 DEG C, 220 DEG C, 220 DEG C, 205 DEG C, 195 DEG C, 195 DEG C. Screw speed is set as per minuteClock 50 turns, and rate of feeding is 50 kilograms per hour; Then pelletizing, obtains injection moulding pellet.
Embodiment 2-7
Embodiment 2-7 adopts the technique identical with embodiment 1, and difference is only following table
Table 2
The injection moulding pellet of embodiment 1-7 is adopted to Japan's steel processed (JSW55 ton horizontal injection press), moltenGlue temperature is set to 190 DEG C from feeding to machine mouth, and 220 DEG C, 230 DEG C, 235 DEG C, 240 DEG C, with 235DEG C, injection cycle was 35 seconds, and grinding tool temperature is 80 DEG C, and mould A face and B face are respectively inlayed oneSintered NdFeB permanent magnet provides axial orientation magnetic field to core rod. Core rod is of a size of cylindrical (diameter 10Millimeter, 7 millimeters of height), make 10 millimeters of width, the standard sample 1-7# that thickness is 7 millimeters.
Above-mentioned standard sample 1-7# is adopted to permanent-magnet material self-operated measuring unit, and (Hunan Province joins many science and technology to be hadLimit company, MATS-2010H) detect, result is as shown in table 3:
Table 3
| Remanent magnetism | HCJ | |
| Embodiment 1,1 | 0.53 tesla | 3.5kOe |
| Embodiment 2,2 | 0.65 tesla | 3.5kOe |
| Embodiment 3,3 | 0.67 tesla | 3.5kOe |
| Embodiment 4,4 | 0.34 tesla | 3.4kOe |
| Embodiment 5,5 | 0.39 tesla | 3.4kOe |
| Embodiment 6,6 | 0.45 tesla | 3.5kOe |
| Embodiment 7,7 | 0.52 tesla | 3.5kOe |
Embodiment 8
Be below preferred embodiment of the present invention, its preparation method is identical with embodiment 1, differenceBe table 4
Table 4
As can be seen from Table 4, embodiment 8 gained pellet proportions are 4.57, unit price be 79.17 yuan/Kilogram, remanent magnetism is in 5290 Gausses, and wherein praseodymium neodymium price is according to 450 yuan of one kilogram of calculating.
It shown in table 5, is the contrast of embodiment 8 pellets and FB-13 and FB-14 ferrite sintered body.
Table 5
| FB-13 | FB-14 | Embodiment 8 pellets | |
| Remanent magnetism | 4,750 | 4,700 | 5,290 |
| HCJ | 4,770 | 5,300 | 3,100 |
| Proportion | 5.16 | 5.16 | 4.57 |
| Finished product price (unit/kilogram) | 95 | 98 | 100 |
| Finished product price (unit/cm3） | 0.49 | 0.51 | 0.457 |
| Magnetic flux price (magnetic flux/(unit/cm3)） | 9,690 | 9,294 | 11,575 |
As can be seen from Table 5, high performance FB-13 and FB-14 ferrite sintered body in industry relatively,Composite granule of the present invention has 10% to 15% cost advantage. Compare FB-13 and FB-14 has20%～25% magnetic flux cost performance promotes. In addition, if prepare magnet ring, FB-13 or FB-14 iron oxygenBody needs multiple tiles to be combined into a ring, and the present invention can single injection-molded magnet ring, thereby keeps awayExempt from the after-sale service quality problem that magnetic shoe comes off brought in application.
Claims (11)
1. an injection moulding pellet composition, is characterized in that, meter by weight, said composition bagDraw together: magnetic 90-95 part, comprises the polymeric blends 4-9.5 of polypropylene and maleic anhydride inoculated polypropylenePart, coupling agent 0.01-3.0 part and/or diffusant 0.01-3.0 part, and releasing agent 0.1-3.0 part;Wherein, maleic anhydride inoculated polypropylene accounts for polymeric blends gross weight in described polymeric blendsMore than 40%.
2. injection moulding pellet composition as claimed in claim 1, is characterized in that, by weightMeter, said composition comprises: magnetic 90-95 part, comprises polypropylene and maleic anhydride inoculated polypropylenePolymeric blends 4-9.5 part, coupling agent 0.02-1.0 part, diffusant 0.02-1.0 part, and the demouldingAgent 0.2-1.0 part; Wherein, in described polymeric blends, maleic anhydride inoculated polypropylene accounts for polymerThe more than 70% of mixture total weight amount.
3. injection moulding pellet composition as claimed in claim 1, is characterized in that, described magnetic isAt least one in nano double phase Nd-Fe-B iron three boron magnetic powders or nano double phase Nd-Fe-B α ferromagnetic powder, andThe mixture of ferromagnetic oxide powder, wherein nano double phase Nd-Fe-B iron three boron magnetic powders or nano double phase Nd-Fe-Bα ferromagnetic powder accounts for the more than 10% of magnetic gross weight.
4. injection moulding pellet composition as claimed in claim 2, is characterized in that, described magnetic isAt least one in nano double phase Nd-Fe-B iron three boron magnetic powders or nano double phase Nd-Fe-B α ferromagnetic powder, andThe mixture of ferromagnetic oxide powder, wherein nano double phase Nd-Fe-B iron three boron magnetic powders or nano double phase Nd-Fe-Bα ferromagnetic powder accounts for the more than 10% of magnetic gross weight.
5. the injection moulding pellet composition as described in claim 1-4 any one, is characterized in that instituteStating coupling agent is silane coupler or titanate coupling agent; Described releasing agent is Tissuemat E or stearoylAmine; Described diffusant is calcium stearate, zinc stearate or sulfoacid calcium.
6. an injection moulding pellet, by composition described in claim 1-5 any one through extruding, pelletizing systemStandby forming.
7. a preparation method for injection moulding pellet, comprises the following steps:
1) mix
Following substances is mixed to get and is extruded with mixture: magnetic 90-95 part, comprises polypropylene and MalaysiaMixture 4-9.5 part of anhydride-grafted polypropylene, coupling agent 0.01-3.0 part and/or diffusant 0.01-3.0Part, and releasing agent 0.1-3.0 part; Wherein, maleic anhydride inoculated polypropylene accounts for and comprises polypropylene and horseThe more than 40% of polymeric blends gross weight of maleic anhydride grafted polypropylene;
2) extrude, pelletizing
By step 1) gained mixture adds in extruder and extrudes, and extruder temperature is set to140-260 DEG C; Then pelletizing.
8. preparation method as claimed in claim 7, is characterized in that, wherein step 2) extruder temperatureDegree is set to 160-220 DEG C.
9. preparation method as claimed in claim 7, is characterized in that, 1) before blend step,Further comprise powder process step: the mixture that comprises polypropylene and maleic anhydride inoculated polypropylene is madePowdery.
10. preparation method as claimed in claim 7, is characterized in that, described magnetic is nanometer two-phaseAt least one in neodymium iron boron iron three boron magnetic powders or nano double phase Nd-Fe-B α ferromagnetic powder, and ferrite magneticThe mixture of powder, wherein nano double phase Nd-Fe-B iron three boron magnetic powders or nano double phase Nd-Fe-B α ferromagnetic powderAccount for the more than 10% of magnetic gross weight.
11. 1 kinds of injection moulding pellets, by claim 7-10 described in any method be prepared from.
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| JP2010235699A (en) * | 2009-03-30 | 2010-10-21 | Nippon Zeon Co Ltd | Compound liquid for polymer molding, polymer molded body, and composite polymer molded body |
| CN102558679A (en) * | 2011-12-28 | 2012-07-11 | 苏州晋圣博高分子材料科技有限公司 | Novel bamboo fiber/polypropylene composite material and method for preparing same |
| CN103258610A (en) * | 2013-05-14 | 2013-08-21 | 厦门建霖工业有限公司 | Magnetic plastic composite material and preparation method thereof |
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