CN109014174A - A kind of 3D printing composite material and preparation method of SEBS cladding tungsten - Google Patents
A kind of 3D printing composite material and preparation method of SEBS cladding tungsten Download PDFInfo
- Publication number
- CN109014174A CN109014174A CN201810868685.XA CN201810868685A CN109014174A CN 109014174 A CN109014174 A CN 109014174A CN 201810868685 A CN201810868685 A CN 201810868685A CN 109014174 A CN109014174 A CN 109014174A
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- Prior art keywords
- sebs
- powder
- tungsten
- composite material
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/102—Metallic powder coated with organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
Abstract
The invention discloses a kind of 3D printing composite material and preparation methods of SEBS cladding tungsten；SEBS is first heated to molten condition in planetary spiral blender, then being sent into tungsten powder again with given pace is sufficiently stirred it with melting SEBS, obtained SEBS and tungsten powder mixed solution are turned in high pressure gas atomising device, it is made to be divided into droplet precipitating, cooled and solidified is collected.It will finally obtain being added in flour mill after primary powder body material is dry and be made powdered, and obtain the 3D printing composite material of SEBS coated tungsten powder.Composite material prepared by the present invention is the globular powder material of thermoplastic elastomer (TPE) coated tungsten powder, and mainstream is had excellent performance, and flexible height, covered effect are good, prepares molded part suitable for SLS, and the product printed has the function of factors for radiation shielding.
Description
Technical field
The invention belongs to the 3D printing of 3D printing technical field of material more particularly to a kind of SEBS cladding tungsten is multiple
Condensation material and preparation method thereof.
Background technique
Selective laser sintering (Selective Laser Sintering, SLS) technology is the development of mid-term the 1990s
A kind of material forming process based on discrete/accumulation principle to get up.It is integrated with CAD/CAM, Numeric Control Technology, laser processing
The newest fruits in the fields such as technology and material science can automatically and quickly convert design philosophy to certain structure
With the components of function.There is the technology forming process to be not necessarily to cutter, product development speed insensitive to the complexity of product
The series of advantages such as fast.The quick manufacture that complicated shape high molecular functional part is realized using SLS, not by the limit of part complexity
System, manufacture efficiency are high, at low cost.Thus, it has broad application prospects, but it is also the hot spot studied both at home and abroad and hardly possible
Point.
Selective laser sintering technology (SLS) constructs the three-dimensional digital of part first with computer aided design software
Then model transmits threedimensional model in professional software along molding short transverse slicing treatment, and the information of each lamella
Give SLS molding machine.When forming, first uniformly tile on forming board one layer of dusty material to be formed (metal powder, pottery
Porcelain, polymer etc.), thickness is corresponding with the lift height of first layer, it is heated to the temperature (preheating) of slightly below fusing point,
Then computerized control laser beam, scans the powder completed according to the cross sectional shape of this layer, makes its melted by heat or sintering.
Take one layer it is scanned after, workbench moves down the height of a thickness, and next layer of powder is equably layered on preceding layer
On, continue selective laser sintering, thus successively sintering, superposition ultimately form reality corresponding with three-dimensional digitalization model
Body.
Moulding material used in selective laser sintering (SLS) is dusty material.It is all it is heated after can be mutually bonded
Dusty material or surface be covered with thermoplastic (Gu) powder of property bonding agent is used as SLS material.Generally, mainly have following several
Class: metal base powder, ceramic based powders, pre-alloyed powder, high molecular material etc..But studies have shown that it is really suited for SLS
Material must have good thermoplastic (Gu) property, appropriateness thermal conductivity, relatively narrow " softening-solidification " temperature range, through laser
There are enough adhesive strengths after sintering.In addition, the granularity of dusty material should not be too large, partial size is generally required in 40~150 μ
Between m.
At present be applied to SLS molding polymer material and engineering be mainly polyamide powder (PA), polycarbonate powder (PC),
Acrylonitrile/butadiene/styrene powder (ABS), polyvinyl chloride powder (PVC) etc. and blending and modifying polymer material and engineering.
Its product is generally engineer application functor, because of with good stability, heat resistance, corrosion resistance and excellent physical
Can, it can be used as computer, the shell of automobile, suction pipe, medical device etc..
Radiation shielding material is the material mixed by the filler material for absorbing radiation with elastomer polymer by one.As screen
Cover material is that elastic material cladding or mixing include the metal powder packing material with high atomic series or its compound.It fills out
Fill object material by being more than 80% weight and with the particle size distribution characteristic in 20 microns to 120 micron ranges, packing material with
Elastomer mixes powdered, and can be the elasticity due to them and is processed to protective garment attribute.Radiation shield
Material special protection radiology is engaged in medical treatment and technical staff's not raying of technology specialty is irradiated.Typical radiation shielding material
The flexible compound with high filler content being made of synthetic thermoplastic elastomer.For example, vinyl acetate or and ethylene/propylene
The blend of alkene elastomer copolymer can be with the filler of absorption radiation, copper, lead, tin, tungsten, the mixing of or mixtures thereof vulcanized lead；It fills out
Fill material representative at least 90% weight.This packing material is mentioned with powder type of the partial size between 40 microns and 150 microns
For.Metallic lead is typically added to these materials to absorb X-ray radiation；However, the good radiation absorption characteristics of lead are unfavorable
Ground is offset by its toxicity, and the product made is also very heavy.Size distribution and grain shape are that radiation shielding material obtained obtains
Important parameter flexible needed for obtaining.Meanwhile for avoiding filler metal agglomeration together and relatively difficult.
Hydrogenated styrene-butadiene block copolymer (SEBS thermoplastic elastomer (TPE)) is high-intensitive by it, soft, permanent to be become
The small feature of shape is as a kind of thermoplastic elastomer (TPE) with fastest developing speed in the world.In coating, handle, stationery, toy, sports equipment
Shake hands, sealing strip, wire and cable, toothbrush handle etc. are widely used.It is also very suitable for being used as covering material to prepare composite wood
Material, mechanical property is constant after modifying plastics, and flexible high, mainstream is had excellent performance, so can be used as cladding metal powder prepares spoke
Shielding composite is penetrated for SLS Quick-forming components.
Summary of the invention
It is rare for the radiation proof composite material of tool of existing suitable SLS technology, the present invention is intended to provide a kind of SEBS
Coat the 3D printing composite material and preparation method of tungsten；Its mainstream has excellent performance and has radiation protection function simultaneously
There is the SEBS coated tungsten powder suitable for SLS of good 3D printing effect that there is the advanced composite material (ACM) and its system of radiation protection function
Preparation Method.Have good radiation protection, elasticity and comprehensive mechanical property by the product that SLS is printed, is broadly applicable.
The present invention is achieved through the following technical solutions:
A kind of preparation method of the 3D printing composite material of SEBS cladding tungsten, includes the following steps:
Step 1: preparation molten state thermoplastic elastomer (TPE) SEBS step
By SEBS raw material fusion solvent acetone be added blender in be warming up to 190~200 DEG C, until SEBS be all made it is molten
Melt state, it is spare；
Step 2: it is sent into nano level metal tungsten powder step
It is fitted into vacuum powder supply room after raw material tungsten powder is sufficiently dried, passes through H2, load volume is 0.8~1.2m3/ h carries tungsten
Powder, 40~80g/min of powder sending quantity are sent into agitating device, and tungsten powder and melting SEBS are sufficiently stirred with 600~800rpm of revolving speed
Uniformly, 0.5~1h is stirred；
Step 3: atomization is frozen into powder step
The solution that SEBS has been uniformly mixed with tungsten powder will be melted to go in high-pressure atomizing device, the atomization of high-pressure atomizing device
Droplet precipitating cooled and solidified, the coarse dispersion materials for later use collected is made between 0.5~3mm in the pore size control of nozzle；
Step 4: by step 3 be atomized cooled and solidified preparation coarse dispersion be placed in vacuum drying oven drying, later again by
It is mechanically pulverized and obtains the fine powder material of SEBS cladding tungsten；
Step 5: being encapsulated into bottle for powder composite material obtained collection, and the 3D that can be obtained SEBS cladding tungsten is beaten
Print composite material.
Blender described in above-mentioned steps two uses planetary spiral blender.
The temperature of vacuum drying oven described in above-mentioned steps four is 40~50 DEG C.
The present invention compared with the existing technology, have following advantages and effects
Composite powder spherical shape state prepared by the present invention is good.By first preparing SEBS molten state heat preservation cladding nanoscale
Metal tungsten powder, then carrying out high pressure gas atomization process again reduces composite powder partial size and obtains being spherical or subsphaeroidal
Form, so as to improve tungsten powder covered effect and its 3D printing performance.
SEBS coated tungsten powder prepared by the present invention prepares radiation protection material applied to SLS.Tungsten is coated using SEBS
Composite material have the function of radiation protection, because powder in subsphaeroidal uniform particle sizes therefore be suitable for SLS3D printing, product effect
Well, adhesion strength is high, has excellent mechanical strength and hardness.
The composite material matter of SEBS cladding tungsten prepared by the present invention is soft, and mainstream property is excellent.Have benefited from thermoplastic elastic
Body SEBS is used as cladding sill, and composite material includes its excellent elastic, ageing-resistant, corrosion resistance, is needing radiation protection
Field be widely used.
Detailed description of the invention
Fig. 1 is the 3D printing composite material preparation process flow chart that SEBS of the present invention coats tungsten.
Specific embodiment
The present invention is more specifically described in detail combined with specific embodiments below.
The 3D printing composite material of SEBS cladding tungsten of the present invention is that have radiation protection by SEBS cladding tungsten
Function powder is in spherical or close spherical composite powder material；SEBS raw material is chosen for the hub-and-spoke configuration of high molecular weight.
Composite material is prepared by following components raw material: 30 parts of thermoplastic elastomer (TPE) SEBS, 70 parts of nano-tungsten powders, solvent
Acetone.SEBS and tungsten powder melting cladding total weight component are 100.
Thermoplastic elastomer (TPE) SEBS is chosen for Ba Ling petrochemical industry SEBS model YH-602T.
Nano-tungsten powder is the good nano grade tungsten powder of sphericity made from plasma chemical vapor evaporation, and average grain diameter is
0.2μm。
Preparation process is as follows:
Step 1: preparation molten state thermoplastic elastomer (TPE) SEBS step
SEBS raw material fusion solvent acetone is added in (planetary spiral) blender and is warming up to 195 DEG C, until SEBS is whole
Molten condition is made, it is spare；
Step 2: it is sent into nano level metal tungsten powder step
It is fitted into vacuum powder supply room after raw material tungsten powder is sufficiently dried, passes through H2, load volume is 0.8~1.2m3/ h carries tungsten
Powder, powder sending quantity 50g/min are sent into agitating device, are stirred tungsten powder and melting SEBS with revolving speed 700rpm, are stirred
40min；
Step 3: atomization is frozen into powder step
The solution that SEBS has been uniformly mixed with tungsten powder will be melted to go in high pressure (60~80MPa) atomising device, high pressure mist
Disguise the pore size control for the atomizer set between 0.5~3mm, droplet precipitating cooled and solidified is made, that collects is thick
Powder body material is spare；
Step 4: the coarse dispersion material for being atomized cooled and solidified preparation in step 3 being placed in 40 DEG C of vacuum drying ovens and is dried,
The fine materials of SEBS cladding tungsten are finally obtained through being mechanically pulverized again；
Step 5: powder composite material obtained collection is encapsulated into bottle；The 3D printing for obtaining SEBS cladding tungsten is multiple
Condensation material.
Composite material prepared by the present invention is the globular powder material of thermoplastic elastomer (TPE) coated tungsten powder, and mainstream performance is excellent
Different, flexible height, covered effect are good, prepare molded part suitable for SLS, have spoke by the product that the composite material prints
The function of penetrating shielding protection can effectively protect radiology and is engaged in medical treatment and technical staff's not raying of technology specialty irradiation.
As described above, the present invention can be better realized.
Embodiment of the present invention are not limited by the above embodiments, other are any without departing from Spirit Essence of the invention
With changes, modifications, substitutions, combinations, simplifications made under principle, equivalent substitute mode should be, be included in of the invention
Within protection scope.
Claims (4)
1. a kind of preparation method of the 3D printing composite material of SEBS cladding tungsten, it is characterised in that include the following steps:
Step 1: preparation molten state thermoplastic elastomer (TPE) SEBS step
SEBS raw material fusion solvent acetone is added in blender and is warming up to 190~200 DEG C, until molten is all made in SEBS
State, it is spare；
Step 2: it is sent into nano level metal tungsten powder step
It is fitted into vacuum powder supply room after raw material tungsten powder is sufficiently dried, passes through H2, load volume is 0.8~1.2m3/ h carries tungsten powder,
40~80g/min of powder sending quantity is sent into agitating device, and tungsten powder and melting SEBS are sufficiently stirred with 600~800rpm of revolving speed
It is even, stir 0.5~1h；
Step 3: atomization is frozen into powder step
The solution that SEBS has been uniformly mixed with tungsten powder will be melted to go in high-pressure atomizing device, the atomizer of high-pressure atomizing device
Pore size control between 0.5~3mm, be made droplet precipitating cooled and solidified, the coarse dispersion materials for later use collected；
Step 4: the coarse dispersion that cooled and solidified preparation is atomized in step 3 is placed in vacuum drying oven drying, later again by machinery
It crushes and obtains the fine powder material of SEBS cladding tungsten；
Step 5: powder composite material obtained collection is encapsulated into bottle.
2. SEBS coats the preparation method of the 3D printing composite material of tungsten according to claim 1, it is characterised in that: institute
Blender is stated using planetary spiral blender.
3. SEBS coats the preparation method of the 3D printing composite material of tungsten according to claim 2, it is characterised in that: step
The temperature of rapid four vacuum drying oven is 40~50 DEG C.
4. a kind of 3D printing composite material of SEBS cladding tungsten, it is characterised in that using preparation method described in claim 3
It is made.
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| CN201810868685.XA CN109014174A (en) | 2018-08-02 | 2018-08-02 | A kind of 3D printing composite material and preparation method of SEBS cladding tungsten |
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| CN201810868685.XA CN109014174A (en) | 2018-08-02 | 2018-08-02 | A kind of 3D printing composite material and preparation method of SEBS cladding tungsten |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659881A (en) * | 2020-06-29 | 2020-09-15 | 青岛聚鑫园钨业有限公司 | Tungsten-based radiation protection composite material for additive manufacturing and preparation method thereof |
| CN113681024A (en) * | 2021-07-28 | 2021-11-23 | 北京科技大学 | Method for preparing tungsten metal part based on feeding printing |
| CN114799190A (en) * | 2022-06-20 | 2022-07-29 | 杭州电子科技大学富阳电子信息研究院有限公司 | Gold nanorod film and synthesis method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050004290A1 (en) * | 2001-09-28 | 2005-01-06 | Yasunao Kai | High-density composite material |
| CN101074315A (en) * | 2006-05-17 | 2007-11-21 | 张发饶 | Production of high-specific weight resin |
| CN101256849A (en) * | 2007-01-25 | 2008-09-03 | 哈钦森公司 | Multilayer elastomeric material filled with radiation-attenuating compounds, preparation method and uses thereof |
| CN102186910A (en) * | 2008-10-20 | 2011-09-14 | 沙伯基础创新塑料知识产权有限公司 | Flow-enhanced thermoplastic compositions and methods for enhancing the flow of thermoplastic compositions |
| CN102549057A (en) * | 2009-07-31 | 2012-07-04 | 阿海法核燃料公司 | Radiation-attenuating elastomer material, multi-layer glove for protection against ionising radiation and uses thereof |
| CN102585330A (en) * | 2012-01-18 | 2012-07-18 | 厦门虹鹭钨钼工业有限公司 | Tungsten-polymer composite material and preparation method thereof |
| CN102702663A (en) * | 2012-06-13 | 2012-10-03 | 华南理工大学 | Halogen-free flame-retardant SEBS thermoplastic elastomer composition and preparation method thereof |
| CN106554473A (en) * | 2015-09-28 | 2017-04-05 | 中国石油化工股份有限公司 | A kind of SEBS elastomer powders suitable for 3D printing and its preparation method and application |
-
2018
- 2018-08-02 CN CN201810868685.XA patent/CN109014174A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050004290A1 (en) * | 2001-09-28 | 2005-01-06 | Yasunao Kai | High-density composite material |
| CN101074315A (en) * | 2006-05-17 | 2007-11-21 | 张发饶 | Production of high-specific weight resin |
| CN101256849A (en) * | 2007-01-25 | 2008-09-03 | 哈钦森公司 | Multilayer elastomeric material filled with radiation-attenuating compounds, preparation method and uses thereof |
| CN102186910A (en) * | 2008-10-20 | 2011-09-14 | 沙伯基础创新塑料知识产权有限公司 | Flow-enhanced thermoplastic compositions and methods for enhancing the flow of thermoplastic compositions |
| CN102549057A (en) * | 2009-07-31 | 2012-07-04 | 阿海法核燃料公司 | Radiation-attenuating elastomer material, multi-layer glove for protection against ionising radiation and uses thereof |
| CN102585330A (en) * | 2012-01-18 | 2012-07-18 | 厦门虹鹭钨钼工业有限公司 | Tungsten-polymer composite material and preparation method thereof |
| CN102702663A (en) * | 2012-06-13 | 2012-10-03 | 华南理工大学 | Halogen-free flame-retardant SEBS thermoplastic elastomer composition and preparation method thereof |
| CN106554473A (en) * | 2015-09-28 | 2017-04-05 | 中国石油化工股份有限公司 | A kind of SEBS elastomer powders suitable for 3D printing and its preparation method and application |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659881A (en) * | 2020-06-29 | 2020-09-15 | 青岛聚鑫园钨业有限公司 | Tungsten-based radiation protection composite material for additive manufacturing and preparation method thereof |
| CN111659881B (en) * | 2020-06-29 | 2022-03-18 | 青岛聚鑫园钨业有限公司 | Tungsten-based radiation protection composite material for additive manufacturing and preparation method thereof |
| CN113681024A (en) * | 2021-07-28 | 2021-11-23 | 北京科技大学 | Method for preparing tungsten metal part based on feeding printing |
| CN113681024B (en) * | 2021-07-28 | 2022-10-14 | 北京科技大学 | Method for preparing tungsten metal part based on feeding printing |
| CN114799190A (en) * | 2022-06-20 | 2022-07-29 | 杭州电子科技大学富阳电子信息研究院有限公司 | Gold nanorod film and synthesis method thereof |
| CN114799190B (en) * | 2022-06-20 | 2023-04-28 | 杭州电子科技大学富阳电子信息研究院有限公司 | Gold nanorod film and synthesis method thereof |
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