CN103951971A - Carbon fiber reinforced resin powder material for selective laser sintering - Google Patents
Carbon fiber reinforced resin powder material for selective laser sintering Download PDFInfo
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Abstract
The invention relates to a carbon fiber reinforced resin powder material for selective laser sintering (SLS). The powder material comprises 48-88 parts by mass of resin powder, 10-50 parts by mass of carbon fibers, 0.5-1.2 parts by mass of antioxidants, 0.2-1 part by mass of flow promoting agent and 0.2-0.6 parts by mass of dispersant per 100 parts by mass of the reinforced material. The carbon fiber reinforced resin powder material for selective laser sintering is obtained by configuring the each component sequentially according to a certain process. The strength and modulus of SLS molded parts made of the resin powder material disclosed by the invention, compared with SLS molded parts made of the matrix resin material, are greatly enhanced and the requirements on the mechanical performance of the molded parts directly as end products can be met better.
Description
Technical field
The present invention relates to Material Field, be specifically related to a kind of carbon fiber-reinforced resin powdered material for selective laser sintering.
Background technology
At Selective Laser Sintering (Selective Laser Sintering, be called for short SLS) be current a kind of rapid shaping technique being widely used, its moulding process principle is: the electronic 3-D model of model target part, then by delamination software, three-dimensional model is carried out to slicing treatment, obtain the data message of each processing aspect, under computer control, according to slicing layer surface information, utilize laser beam successively to scan sintering to powdered material that can hot melt, finally complete the processing and manufacturing of target part.The non-constant width of the applicable material ranges of SLS technology, comprises polymkeric substance, metal and pottery etc.
In selective laser sintering technique, powdered material is the key factor that affects part performance.Because polymer materials is compared with stupalith with metal, there is the advantages such as mold temperature is low, sintering power is little, thereby become the maximum SLS material of current application.Nylon-based resin material is a kind of semi-crystalline polymer, has good sintering character and lower melt viscosity, can, mechanical property good function part higher by SLS straight forming density, become one of SLS formed material being most widely used at present.But such strength of materials and rigidity are lower, the performance requirement that can not meet some profiled member measuring mechanical property requirement or directly use as the finished product by SLS technology institute moulding product.
The mechanical property requirements directly using as end product for meeting resin SLS product, there is at present multiple Enhancement Method, as glass fibre, mineral fibre strengthen resin-based materials, but due to mechanical property and the surface topography problem of glass fibre and mineral fibre itself, it is not desirable especially making reinforced effects, is not well positioned to meet the application demand of some SLS profiled member.Carbon fiber has the features such as light weight, intensity be high, wear-resistant, and through carbon fiber reinforced resin material, its SLS profiled member has a distinct increment on strength and modulus compared to the SLS profiled member of matrix resin material, has improved the range of application of SLS profiled member.
Summary of the invention
The invention provides a kind of carbon fiber-reinforced resin powdered material for selective laser sintering, this material SLS profiled member has a distinct increment on strength and modulus compared to the SLS profiled member of matrix resin material, can more meet the performance requriements that SLS profiled member directly uses as end product.
The present invention relates to a kind of carbon fiber-reinforced resin powdered material for selective laser sintering, this material comprises toner, carbon fiber, oxidation inhibitor, flow promotor and dispersion agent.Wherein the mass percent of each component is: in the time that this strongthener mass fraction is 100 parts, toner mass fraction is 48-88 part, carbon fiber mass fraction is 10-50 part, flow promotor mass fraction is 0.2-1 part, oxidation inhibitor mass fraction 0.2-1.2 part, dispersion agent mass fraction is 0.1-0.6 part.
In the carbon fiber reinforced resin material for selective laser sintering, along with the raising of wild phase carbon fiber component concentration, its profiled member intensity is substantially in rising trend, but when carbon fiber component concentration is too high, contact surface in profiled member between carbon fiber and carbon fiber will increase, and this contact is weak contact, run up to and can reduce on the contrary profiled member intensity when a certain amount of, therefore in the time that carbon fiber component concentration exceeds a certain value, its profiled member intensity presents and does not rise anti-phenomenon of falling.Flow promotor can improve the flowing property of material, it is more even that dispersion agent can make carbon fiber disperse, but in the SLS technological process using carbon dioxide laser as energy source, be different from resin material absorbing laser energy and realize melting adhered process, flow promotor and dispersion agent all exist with solid form in this process, therefore the too high molten state component adhesive effect that also can reduce of both component concentrations.Oxidation inhibitor can prevent that powder is oxidized in SLS sintering process, but in the time that oxidation inhibitor addition exceedes certain value, antioxidant effect can not strengthen along with increasing of addition again, and oxidation inhibitor can produce volatile matter in sintering process in addition, is unfavorable for maintenance and the maintenance of molding device.
In the present invention available toner can be nylon 11, nylon 12, nylon 1212, nylon 6, nylon 66, polypropylene wherein one or more.In SLS technological process, powder diameter distribution influence paving powder process and surface of shaped parts quality.In the time that powder diameter is too small, the frictional force between powder increases, and it is large that clinging power becomes, and mobility variation, is unfavorable for spreading powder; In the time that powder diameter is excessive, paving powder process can produce scratch, and surface of shaped parts is coarse.Experiment shows, powder diameter is distributed in 20-150 micron, preferable particle size scope 30-100 micron, and the toner that is normal distribution and pattern and is substantially spherical or elliposoidal has good mobility, is conducive to spread powder and sintering.
In the present invention, preferred carbon fiber diameter is 7-10 micron, and length is 201-350 micron.Conventionally carbon fiber is longer, and reinforced effects is better, but carbon fiber itself has certain sinuousness, oversize easy reunion of carbon fiber, form floss, and reduce cohesive strength.The too short reinforced effects of carbon fiber length-to-diameter ratio is not obvious, affects on the contrary the elongation at break of profiled member.
After the method for chemical oxidation or coupling grafting is processed, mean diameter is 7-10 micron, and length distribution is that the carbon fiber of 50-200 micron also meets enhancing demand.Conventionally to the method for surface treatment of carbon fibers in this length range be: at 50-80 DEG C, in the concentrated nitric acid solution that is 60-70% in concentration by carbon fiber, soak 1-2 hour, its surface is oxidized; Or use Silane coupling agent KH550 or KH560, in toluene solvant, it is carried out to graft reaction.
In the present invention, the interpolation of flow promotor can increase the processing fluidity of powdered material, improve the surface smoothness of plastic prod, flow promotor can be one or more in aerosil, gaseous oxidation aluminium, gas-phase silica, nano-titanium oxide, nano carborundum powder.
In the present invention, oxidation inhibitor is Hinered phenols antioxidant and phosphite ester kind antioxidant.Preferably oxidation inhibitor by antioxidant 1010 and irgasfos 168 in mass ratio 3:1 be obtained by mixing.
In the present invention, carbon fiber dispersion agent can be one or more in powdered graphite, ethylene group bis-stearamides (EBS), glyceryl monostearate (GMS), Tristearoylglycerol (HTG), barium stearate (BaSt) or microcrystalline wax.
A kind of carbon fiber-reinforced resin powdered material disclosed by the invention can obtain through following steps:
(1) get each constituent materials, wherein carbon fiber mass fraction 10-50 part, toner mass fraction 48-88 part, oxidation inhibitor mass fraction 0.5-1.2 part, flow promotor mass fraction 0.2-1.0 part, dispersion agent mass fraction 0.2-0.6 part according to the component ratio of design;
(2) part toner and flow promotor, oxidation inhibitor and dispersion agent high-speed stirring are mixed to get and draw powder, this whipping process contributes to flow promotor, oxidation inhibitor and dispersion agent to be dispersed in resin material;
(3) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) put into V-type whipping appts and be uniformly mixed drawing powder, the carbon fiber sieving and residual resin powder, stir and can obtain target material in 40-60 minute.
Carbon fiber-reinforced resin powdered material SLS technological forming effect prepared by the present invention is better, profiled member is lightweight, strength and modulus is higher, can be widely used in the test of structure function part or the direct manufacture of terminal part in the fields such as machinery, electric, space flight and aviation, military project, communications and transportation.
Embodiment
Embodiment 1
Below, the embodiment of the present invention is narrated, but the present invention is not limited thereto:
(1) accurately weigh each component according to following data: carbon fiber, 1Kg, its mean diameter is 7 microns, length range 201-300 micron; Nylon 12 powder, 8.8Kg, its particle size range 20-100 micron; Aerosil, 100g; Dispersion agent powdered graphite, 20g; Oxidation inhibitor 1098,80g;
(2) with the high speed agitator of 2.5L, the aerosil of caking is smashed;
(3) be uniformly mixed with 1Kg left and right nylon 12 powder and aerosil, oxidation inhibitor 1098 and the powdered graphite smashed, obtain drawing powder, mix to divide and carry out for 3 times;
(4) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(5) draw powder, the carbon fiber sieving and residue nylon 12 powder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(6) material being stirred in step (5) is target material.
Embodiment 2
(1) accurately weigh each component according to following data: carbon fiber, 2Kg, its mean diameter is 7 microns, length range 201-300 micron; Nylon 12 powder, 7.8Kg, its particle size range 20-100 micron; Aerosil, 90g; Dispersion agent powdered graphite, 30g; Oxidation inhibitor 1098,80g;
(2) with the high speed agitator of 2.5L, the aerosil of caking is smashed;
(3) be uniformly mixed with 1Kg left and right nylon 12 powder and aerosil, oxidation inhibitor 1098 and the powdered graphite smashed, obtain drawing powder, mix to divide and carry out for 3 times;
(4) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(5) draw powder, the carbon fiber sieving and residue nylon 12 powder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(6) material being stirred in step (5) is target material.
Embodiment 3
(1) accurately weigh each component according to following data: carbon fiber, 3Kg, its mean diameter is 7 microns, length range 250-350 micron; Nylon 12 powder, 6.8Kg, its particle size range 25-120 micron; Gaseous oxidation aluminium, 80g; Dispersion agent EBS powder, 50g; Oxidation inhibitor 9228,70g;
(2) be uniformly mixed with 1Kg left and right nylon 12 powder and gaseous oxidation aluminium, oxidation inhibitor 9228 and EBS powder, obtain drawing powder, mix to divide and carry out for 3 times;
(3) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) draw powder, the carbon fiber sieving and residue nylon 12 powder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(5) material being stirred in step (4) is target material.
Embodiment 4
(1) accurately weigh each component according to following data: carbon fiber, 3.5Kg, its mean diameter is 7 microns, length range 201-350 micron; Nylon 1212 poweder, 6.3Kg, its particle size range 30-150 micron; Gas-phase silica, 90g; Dispersion agent barium stearate, 60g; Oxidation inhibitor 3026,50g;
(2) be uniformly mixed with 1Kg left and right nylon 1212 poweder and gas-phase silica, oxidation inhibitor 3026 and barium stearate powder, obtain drawing powder, mix to divide and carry out for 3 times;
(3) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) draw powder, the carbon fiber sieving and residue nylon 1212 poweder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(5) material being stirred in step (4) is target material.
Embodiment 5
(1) accurately weigh each component according to following data: carbon fiber, 4.0Kg, its mean diameter is 7 microns, length range 201-350 micron; Nylon 1212 poweder, 5.8Kg, its particle size range 30-150 micron; Gas-phase silica, 85g; Dispersion agent barium stearate, 55g; Oxidation inhibitor 3026,60g;
(2) be uniformly mixed with 1Kg left and right nylon 1212 poweder and gas-phase silica, oxidation inhibitor 3026 and barium stearate powder, obtain drawing powder, mix to divide and carry out for 3 times;
(3) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) draw powder, the carbon fiber sieving and residue nylon 1212 poweder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(5) material being stirred in step (4) is target material.
Embodiment 6
(1) accurately weigh each component according to following data: carbon fiber, 4.5Kg, its mean diameter is 7 microns, length range 201-300 micron; Nylon 1212 poweder, 5.3Kg, its particle size range 25-100 micron; Nano oxidized silica flour, 40g; Dispersion agent Tristearoylglycerol, 50g; Antioxidant 1010,82.5g, irgasfos 168,27.5g;
(2) be uniformly mixed with 1Kg left and right nylon 1212 poweder and nano oxidized silica flour, antioxidant 1010, irgasfos 168 and Tristearoylglycerol powder, obtain drawing powder, mix to divide and carry out for 3 times;
(3) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) draw powder, the carbon fiber sieving and residue nylon 1212 poweder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(5) material being stirred in step (4) is target material.
Embodiment 7
(1) accurately weigh each component according to following data: carbon fiber, 5.0Kg, its mean diameter is 7 microns, length range 201-300 micron; Nylon 1212 poweder, 4.8Kg, its particle size range 25-100 micron; Nano oxidized silica flour, 20g; Dispersion agent Tristearoylglycerol, 60g; Antioxidant 1010,90g, irgasfos 168,30g;
(2) be uniformly mixed with 1Kg left and right nylon 1212 poweder and nano oxidized silica flour, antioxidant 1010, irgasfos 168 and Tristearoylglycerol powder, obtain drawing powder, mix to divide and carry out for 3 times;
(3) carbon fiber is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) draw powder, the carbon fiber sieving and residue nylon 1212 poweder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(5) material being stirred in step (4) is target material.
Embodiment 8
(1) accurately weigh each component according to following data: carbon fiber, 2.5Kg, its mean diameter is 7 microns, length range 50-200 micron; The concentration preparing is 60% concentrated nitric acid 500ml; Nylon 12 powder, 7.3Kg, its particle size range 25-120 micron; Gaseous oxidation aluminium, 90g; Dispersion agent EBS, 40g; Oxidation inhibitor 9228,70g; Separately need distilled water some, one of heating platform, one of infrared thermometer, three, 1L beaker;
(2) concentrated nitric acid that is 60% by 500ml concentration packs in 1L beaker, get 0.5Kg carbon fiber and put into beaker, beaker is placed on heating platform and is heated, heating and temperature control is at 50-60 DEG C, use infrared thermometer detecting temperature, soak 1 hour, then carbon fiber is taken out to be placed in the beaker that distilled water is housed and clean, repeatedly clean 5 times, finally carbon fiber is put into loft drier and dry.Repeat aforesaid operations 5 times, 2.5Kg carbon fiber is all carried out to surface oxidation treatment;
(3) carbon fiber of all oven dry is sieved with 80 mesh sieves, the part of reuniting in carbon fiber and impurity are screened out;
(4) be uniformly mixed with 1Kg left and right nylon 12 powder and gaseous oxidation aluminium, oxidation inhibitor 9228 and EBS powder, obtain drawing powder, mix to divide and carry out for 3 times;
(5) draw powder, the carbon fiber sieving and residue nylon 12 powder and put into V-type whipping appts and be uniformly mixed, churning time is 40-60 minute;
(6) material being stirred in step (5) is target material.
Following table is that nylon 12 SLS profiled members, nylon 1212 SLS profiled member contrast with the strength and modulus of SLS profiled member after carbon fiber strengthens:
Claims (8)
1. the carbon fiber-reinforced resin powdered material for selective laser sintering, it is characterized in that: this powdered material comprises toner, carbon fiber, oxidation inhibitor, flow promotor and dispersion agent, in the time that this strongthener mass fraction is 100 parts, toner mass fraction is 48-88 part, carbon fiber mass fraction is 10-50 part, flow promotor mass fraction is 0.2-1 part, and oxidation inhibitor mass fraction is 0.5-1.2 part, and dispersion agent mass fraction is 0.2-0.6 part.
2. according to claim 1, it is characterized in that toner can be nylon 11, nylon 12, nylon 1212, nylon 6, nylon 66, polypropylene wherein one or more, its particle size distribution range is 20-150 micron, is normal distribution, and pattern is ganoid spherical or ellipsoidal particle.
3. according to claim 1, the diameter that it is characterized in that described carbon fiber is 7-10 micron, and length is 201-350 micron.
4. according to claim 1, it is characterized in that described carbon fiber is after the method for chemical oxidation or coupling grafting is processed, mean diameter is 7-10 micron, and length distribution is 50-200 micron.
5. according to claim 1 or 4, it is characterized in that using coupling Graft Method Treatment of Carbon coupling agent used is silane coupling agent, and graft reaction carries out in toluene solvant.
6. according to claim 1, it is characterized in that described flow promotor is one or more in aerosil, gaseous oxidation aluminium, gas-phase silica, nano-titanium oxide, nano carborundum powder.
7. according to claim 1, it is characterized in that described oxidation inhibitor is Hinered phenols antioxidant and phosphite ester kind antioxidant.
8. according to claim 1, it is characterized in that described dispersion agent can be one or more in powdered graphite, ethylene group bis-stearamides, glyceryl monostearate, Tristearoylglycerol, barium stearate, microcrystalline wax.
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| CN104109343A (en) * | 2014-08-01 | 2014-10-22 | 中国科学院重庆绿色智能技术研究院 | High-flowability plastic composite powder material and preparation method thereof |
| CN104693579A (en) * | 2015-02-17 | 2015-06-10 | 北京北方恒利科技发展有限公司 | Composite modified wax powder for laser-sintering 3D (three-dimensional) printing and preparation method for composite modified wax powder |
| CN104710786A (en) * | 2015-04-02 | 2015-06-17 | 湖南华曙高科技有限责任公司 | Toughening material for selective laser sintering and preparation method thereof |
| CN104875395A (en) * | 2015-05-15 | 2015-09-02 | 湖南大学 | Preparation method of forming material for selective laser sintering |
| CN105131516A (en) * | 2015-09-17 | 2015-12-09 | 中南大学 | Preparation of powdered material for 3D printing preparation of carbon/carbon composite |
| CN105172142A (en) * | 2015-09-17 | 2015-12-23 | 中南大学 | Method for preparing carbon/carbon composite materials through 3D printing |
| CN105462244A (en) * | 2014-09-10 | 2016-04-06 | 中国科学院理化技术研究所 | Preparation method of carbon fiber reinforced nylon composite micro powder for selective laser sintering |
| CN105802012A (en) * | 2016-04-18 | 2016-07-27 | 汪艳 | Polypropylene powder material used for selective laser sintering and preparation method thereof |
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