CN108912674A - Nylon glass fiber composite powder material preparation method for selective laser sintering - Google Patents
Nylon glass fiber composite powder material preparation method for selective laser sintering Download PDFInfo
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Abstract
The present invention provides a kind of nylon glass fiber composite powder material preparation methods for selective laser sintering, specially, glass fibre, alcohols solvent, distilled water, tetraethoxysilane and polysiloxanes Jing Guo purification process is configured to uniform solution, reaction temperature is 70~90 DEG C, lotion is added in the solution, after reacting 1~5h, glass fibre is washed and dried with solvent, modified glass fibre is made；Glass fibre, nylon raw material and molecular weight regulator Jing Guo modification is added in deionized water according to 8.5~39.5%: 60~90%: 0.5~1.5% mass percent, after carrying out polymerization reaction, water cooling bracing pelletizing is carried out again, obtains nylon glass fiber pellet；Nylon powder, antioxidant, flow promortor are uniformly mixed screening, the nylon glass fiber composite dusty material for selective laser sintering is made.The powder flowbility of material prepared of the present invention is good, and powdering effect is good, sintering product good mechanical property.
Description
Technical field
The invention belongs to increases material manufacturing technology fields, and in particular to a kind of nylon glass for selective laser sintering is fine
Tie up composite powder material preparation method.
Background technique
3D printing technique is the common name of increases material manufacturing technology, be one have Digitized manufacturing, highly flexible and adaptability,
The advanced manufacturing technology for the distinguishing features such as direct CAD model drives, quick, material type is rich and varied, can be by the several of prototype
The combined information of what shape, structure and selected materials establishes digitization descriptive model, these information are output to computer later
The electromechanical integrated manufacturing system of control carries out point-by-point, by-line, the three-dimensional packing molding production 3D solid by face.Relative to tradition
Subtract material manufacture processing technology, increases material manufacturing technology can directly pass through computer model data without proembryo and mold, pass through
The method being successively superimposed produces any desired physical member, can effectively simplify the fabrication schedule of product, shorten grinding for product
Period processed improves efficiency and reduces cost.3D printing technique is widely used to aerospace, automobile manufacture, mold manufacture, life
The numerous areas such as object engineering and medical treatment, building, art manufacture.Selective Laser Sintering (SLS) is common currently on the market
A kind of 3D printing method, the method can produce high-precision manufacture parts, be widely applied by many fields.
Existing simple 3D printing high molecular material, price is higher, is above unable to satisfy all application requirements in application.
Usually enhanced by adding other inorganic fillers, not only reduces price, while also improving selection laser sintering technology
Application field.Industrially common glass fibre carries out enhancing modification to high molecular material, and glass fiber reinforcement is mainly matrix
Stress transfer is carried out in interface phase region between fiber, to improve the mechanical property of composite material.
Glass fibre mobility is poor when being directly appended in nylon powder, and powder flowbility is poor.Due to glass fibre
Specific gravity is heavier, when glass fibre additive amount is excessive, has influenced composite powder powdering, leads to composite powder porosity in powder bed
Height, shaping workpiece gap is high, has influenced the mechanical property of molded part.The amount of glass fibre is very little, does not have glass fibre increasing
Strong effect.Glass fibre there are problems that during powdering being orientated again simultaneously, causes compared with multifilament along roller orientation enhancement,
And other orientation enhancements are less, it is desirable to obtain the better nylon glass fibrous composite of performance, need to improve the flowing of powder
Property, improve its anisotropic performance.
Summary of the invention
The present invention provides a kind of for the nylon glass fiber composite dusty material of selective laser sintering and its preparation side
Method, nylon coat modified glass fibre, and powder flowbility is good, and powdering effect is more preferable, and strength modulus is more preferable, glass fibre energy
All directions enhance in nylon, and nylon glass fibrous composite has also been enlarged in compound more preferable of glass fibre and nylon
Application field.
The present invention provides a kind of nylon glass fiber composite powder material preparation method for selective laser sintering, packet
Include following steps：
Step 1: glass fibre, alcohols solvent, distilled water and the polysiloxanes Jing Guo purification process are configured to uniformly
Solution, reaction temperature are 70~90 DEG C, and lotion is added in the solution, after reacting 1~5h, glass fibre is washed with solvent
It washs and dries, modified glass fibre is made；
Step 2: by glass fibre, nylon raw material and the molecular weight regulator Jing Guo modification according to 8.5~39.5%
: 60~90%: 0.5~1.5% mass percent is added in deionized water, after carrying out polymerization reaction, then carries out water cooling bracing
Pelletizing obtains nylon glass fiber pellet；
Step 3: the nylon glass fiber pellet is passed through deep cooling crush and nylon glass is made after sieving 80~100 μm
Glass fiber dust；
Step 4: nylon glass fiber dust, antioxidant, flow promortor are uniformly mixed screening, it is made for selecting
The laser sintered nylon glass fiber composite dusty material of property.
Further, the mass percent of the nylon glass fiber dust, antioxidant and flow promortor is 1:0.5~
2%:0.5~2%.
Further, the mass percent of the alcohols solvent, distilled water, tetraethoxysilane and polysiloxanes be 30~
40%, 40~50%, 0~10% and 10~30%.
It further, is 5~15 μm by the average grain diameter of the glass fibre of purification process, average length is 80~100 μ
m。
Further, the purification process of the glass fibre is specially：Glass fibers are removed using potassium bichromate and the concentrated sulfuric acid
Then impurity in dimension removes unreacted potassium bichromate and the concentrated sulfuric acid using hydrogen peroxide, is washed with distilled water, finally filters
It is dry, obtain the glass fibre of purification process.
Further, the technique of the polymerization reaction is specially：By glass fibre, nylon raw material, molecular weight regulator and
Deionized water is added in polymeric kettle, and reaction kettle is closed, vacuumizes, and then passing to pressure in inert gas to reaction kettle is 0.10
~0.15Mpa is warming up to 190~235 DEG C, then reacting kettle inner pressure is slowly put up to 1.1~1.6MPa, 0.5~3h of pressure maintaining
Gas is warming up to 230~280 DEG C, keeps 0.2~3h of reaction, stop heating to normal pressure.
Further, the polysiloxanes be polymethyl siloxane, polyethylsiloxane, polydimethylhydroxysiloxane and
One of phenyl silicone and a variety of.
Further, the partial size of the nylon glass fiber composite powder of the selective laser sintering is 80~100 μm.
Further, the technique of the deep cooling crush is specially：For selecting the crushing of pulverizing chamber in the disintegrating process
Temperature controls between -100~-70 DEG C, and adjusting rotor clearance is 2~3mm, and engine speed is 4000~5000r/min, charging
Rate control is at 6~12kg/ (kWh).
Further, the nylon raw material be caprolactam, PA66 salt, PA610 salt, PA612 salt, PA1010 salt,
The one or more of PA1012 salt, PA1212 salt and lauric lactam and 11- aminoundecanoic acid.
Nylon glass fiber composite dusty material and preparation method thereof for selective laser sintering of the invention has
Following beneficial effect：
(1), the composite material of glass fibre and nylon, strength modulus is higher, and it is multiple preferably to expand nylon glass fiber
The application field of condensation material.
(2), the composite powder of the glass fibre of cladding nylon is prepared by deep cooling crush nylon glass fiber pellet,
Blending method of the powder of this nylon composite glass fiber relative to nylon and glass fibre, nylon powder and glass fibre are mixed
It closes more evenly, while this nylon composite glass fiber powder, powder flowbility is good, and the apparent density of powder is high.Even high
The glass fibre of content also can guarantee that powder can be sintered success.Simultaneously because glass fibre is unordered, institute in nylon powder
With in sintering glass fibre in composite material be also it is unordered, glass fibre all directions in nylon are enhanced.
(3), to the modification of fiberglass surfacing, the physical activity and chemical activity of fiberglass surfacing can be improved,
Fiberglass surfacing forms the uniform membrane structure of the Gradient Features of-Si-O and-the Si-R- structure of flexible chain, so that glass
Compound more preferable of glass fiber and nylon, can form good interface interaction, the siloxy of fiberglass surfacing in the composite
Group's reactivity with higher in modified-reaction, can repair fiberglass surfacing stress defect, eliminate moisture, alkali metal oxygen
The influence of the Contamination On Mechanical Properties of Composite Materials such as compound.
Detailed description of the invention
Fig. 1 is to be sintered using the nylon glass fiber composite dusty material produced by the present invention for selective laser sintering
Effect picture afterwards；
Fig. 2 is using the sintered effect picture of nylon glass fiber composite dusty material obtained in comparative example 1.
Specific embodiment
The present invention uses a kind of that glass fibre is modified, and nylon pellet and glass fibre are added in polymeric kettle,
After being granulated by the method for polymerization system material, pass through the method powder of deep cooling crush.After glass fibre passes through purification process, and with four
Ethoxysilane and polysiloxanes are raw material, are modified to fiberglass surfacing, and cohesive force increases between glass fibre and matrix
By force, the performance of composite material is improved.By deep cooling powder, glass fibers are contained in the nylon glass fiber dust that is prepared
Dimension, and in nylon glass fiber dust, the glass fibre orientation of nylon cladding is different, and passes through selective laser sintering
When all directions mechanical property be enhanced.Such powder-making technique is used simultaneously, because glass fibre is coated on nylon powder
In end, the mobility of nylon powder is preferable, ensure that the apparent density of powder for having coated glass fibre, burns by selective laser
After knot, sintered part porosity is few, and sintered part mechanical property is good.So material preparation process is simple and environmentally-friendly pollution-free simultaneously, SLS
Product cost is greatly lowered.
The present invention provides a kind of nylon glass fiber composite powder material preparation method for selective laser sintering, packet
Include following steps：
Step 1: glass fibre, alcohols solvent, distilled water and the polysiloxanes Jing Guo purification process are configured to uniformly
Solution, lasting to stir, reaction temperature is 70~90 DEG C, and lotion is added in solution, and after reacting 1~5h, glass fibre is used
Solvent is washed and is dried, and modified glass fibre is made；
Step 2: by glass fibre, nylon raw material and the molecular weight regulator Jing Guo modification according to 8.5~39.5%
: 60~90%: 0.5~1.5% mass percent is added in deionized water, after carrying out polymerization reaction, then carries out water cooling bracing
Pelletizing obtains nylon glass fiber pellet；
Step 3: nylon glass fiber pellet is passed through deep cooling crush and nylon glass fiber dust is made after sieving；
Step 4: nylon glass fiber dust, antioxidant, flow promortor are uniformly mixed screening, it is made for selecting
The laser sintered nylon glass fiber composite dusty material of property.
By the glass fibre of purification process, the impurity such as moisture removal and metal oxidation are not only removed, while also improving glass fibers
Tie up surface-active.It is grafted by polysiloxanes in fiberglass surfacing, forms uniform membrane structure in fiberglass surfacing,
The surface of film forms hydrophobic palpus shape structure by flexible molecule chain, forms-the Si-O- of flexible chain in fiberglass surfacing
With-Si-R- structure, fiberglass surfacing stress defect is not only repaired, while improving the compatibility of glass fibre and nylon, is mentioned
High nylon and glass fibre interface adhesion strength and stress transfer effect so that glass fibre and nylon is compound
After shaping, performance is enhanced material.
In the present invention, the mass percent of nylon glass fiber dust, antioxidant and flow promortor is 1:0.5~
2%:0.5~2%.
Preferably, the mass percent of alcohols solvent, distilled water, tetraethoxysilane and polysiloxanes be 30~40%,
40~50%, 0~10% and 10~30%.
It preferably, is 5~15 μm by the average grain diameter of the glass fibre of purification process, average length is 80~100 μm.
Glass fiber compound material using glass fibre high intensity and meet with stresses, utilize mobility during nylon molding and fine
Dimension is bonded, in endurance, glass fibre plays the role of transmitting stress for such shaping workpiece, so that nylon is not
Stress transfer has arrived on glass fibre, and gravitation suffered by part is transmitted to entire workpiece.Glass fibre is in composite material in this way
In play the humidification of skeleton structure type, when by load, due to glass fibre transfers, stress is spread rapidly,
The growth for preventing crackle, improves the mechanical property of resin
Preferably, the purification process of glass fibre is specially：It is removed in glass fibre using potassium bichromate and the concentrated sulfuric acid
Then impurity removes unreacted potassium bichromate and the concentrated sulfuric acid using hydrogen peroxide, is washed with distilled water, last filtration drying,
Obtain the glass fibre of purification process.
Preferably, the technique of polymerization reaction is specially：By glass fibre, nylon raw material, molecular weight regulator and deionization
Water is added in polymeric kettle, and reaction kettle is closed, vacuumizes, then pass in inert gas to reaction kettle pressure be 0.10~
0.15Mpa is warming up to 190~235 DEG C, then reacting kettle inner pressure is slowly deflated to up to 1.1~1.6MPa, 0.5~3h of pressure maintaining
Normal pressure is warming up to 230~280 DEG C, keeps 0.2~3h of reaction, stops heating.
Preferably, polysiloxanes is polymethyl siloxane, polyethylsiloxane, polydimethylhydroxysiloxane and polyphenylene
One of siloxanes and a variety of.
Preferably, the partial size of the nylon glass fiber composite powder of selective laser sintering is 80~100 μm.
Preferably, the technique of deep cooling crush is specially：For select pulverizing chamber in disintegrating process crushing temperature control-
Between 100~-70 DEG C, adjusting rotor clearance is 2~3mm, and engine speed is 4000~5000r/min, and feed rate control exists
6~12 kg/ (kWh).
Preferably, nylon raw material be caprolactam, PA66 salt, PA610 salt, PA612 salt, PA1010 salt, PA1012 salt,
The one or more of PA1212 salt and lauric lactam and 11- aminoundecanoic acid.
As a further preferred embodiment of the present invention, the molecular weight regulator is adipic acid, decanedioic acid, 11 carbon two
One of acid, dodecanedioic acid, hendecane dicarboxylic acid and 14 carbon diacid are a variety of.
As a further preferred embodiment of the present invention, the antioxidant is that Hinered phenols antioxidant and phosphorous acid esters are anti-
The composite antioxidant of oxygen agent composition, wherein Hinered phenols antioxidant is preferably 1,3,5- trimethyls -2,4, (3, the 5- bis- tertiary fourths of 6- tri-
Base -4- hydroxybenzyl) benzene, one or both of 2,6- di-t-butyl -4- methyl-phenol, the phosphite ester antioxidant
For bis- (4, the 6- di-tert-butyl-phenyl) fluorophosphites of 2 '-ethyls and/or four (2,4- di-tert-butyl-phenyls) -4,4 '-biphenyl
In base bis-phosphite.
As a further preferred embodiment of the present invention, the flow promortor is fumed silica, gas phase aluminum oxide
Or nano-titanium dioxide.
In embodiments of the present invention, alcohols solvent be methanol, ethyl alcohol, propyl alcohol, butanol, propylene glycol one or more.
It is worth noting that glass fibre is washed and is dried with solvent, the solvent for washing is preferred in step 1
Using alcohols solvent, for washing alcohols solvent and be not involved in the quality proportionings of the above components.
By the way that modified glass fibre is added in polymerization, can glass fibre be preferably dispersed in nylon, together
When fiberglass surfacing flexible spinous process it is preferably compound with nylon.Again by deep cooling powder, cryogenic technology is controlled, is prepared
Particle diameter distribution is relatively narrow.Since glass fibre is coated in nylon powder, glass fibre does not interfere with the mobility of nylon powder,
So that glass fibre and nylon powder porosity are small, composite powder apparent density is high, but also the mechanical property of powder obtains
Guarantee is arrived.
In order to allow those skilled in the art to more fully understand and realize technical solution of the present invention, below by way of specific reality
Applying the form of example, further details of the technical solution of the present invention.
Embodiment 1
Step 1: being 5 μm by diameter, the glass fibre potassium bichromate and the concentrated sulfuric acid that length is 80 μm carry out at purifying
Reason finally uses the unreacted potassium bichromate of hydrogen peroxide removal and the concentrated sulfuric acid, is washed with distilled water, last filtration drying obtains
To the glass fibre of purification process.By glass fibre, methanol, distilled water, tetraethoxysilane and the poly- silicon Jing Guo purification process
Oxygen alkane is configured to uniform solution, and wherein the mass ratio of methanol, distilled water, tetraethoxysilane and polymethyl siloxane is
40%: 45%: 5% and 10%.Lasting stirring, reaction temperature are 70 DEG C, and lotion is added in solution.After reacting 1h, finally
Glass fibre is washed and dried with methanol, modified glass fibre is made.
Step 2: by glass fibre and nylon salt in step 1, PA1212 salt 90%, glass fibre 9.5%, molecular weight
It adjusts 0.5% dose and deionized water is added in polymeric kettle, reaction kettle is closed, vacuumizes, and then passes to inert gas to reaction
Pressure is 0.10Mpa in kettle, is warming up to 190 DEG C, and reacting kettle inner pressure reaches 1.1MPa, then pressure maintaining 3h is slowly deflated to normal pressure,
230 DEG C are warming up to, reaction 3h is kept, stops heating, the cooling tie rod discharging of water, pelletizing obtain nylon glass fiber pellet.
Step 3: it is 80 μm that nylon glass fiber pellet, which is passed through disintegrating process, and powder average particle size is made after sieving
Nylon glass fiber composite powder, wherein the crushing temperature of pulverizing chamber controls between -100 DEG C, and adjusting rotor clearance is 2mm,
Engine speed is 4000r/min, and feed rate is controlled at 6kg/ (kWh).
Step 4: the nylon composite glass fiber powder of step 3 and flow promortor, antioxidant are pressed 1:0.5%:
0.5% proportion mixing, sieves after mixing, the nylon glass fiber composite powder material for selective laser sintering is made
Material.
3 d part is sintered using the obtained nylon glass fiber composite dusty material for selective laser sintering,
And the correlated performance for measuring 3 d part is as shown in table 1.
Embodiment 2
Step 1: being 10 μm by diameter, the glass fibre potassium bichromate and the concentrated sulfuric acid that length is 90 μm carry out at purifying
Reason finally uses the unreacted potassium bichromate of hydrogen peroxide removal and the concentrated sulfuric acid, is washed with distilled water, last filtration drying obtains
To the glass fibre of purification process.By glass fibre, methanol, distilled water, tetraethoxysilane and the poly- first Jing Guo purification process
Radical siloxane is configured to uniform solution, wherein methanol, distilled water, tetraethoxysilane and polymethyl siloxane mass ratio
For 35%: 45%: 5% and 15%.Lasting stirring, reaction temperature are 80 DEG C, and lotion is added in solution.After reacting 3h, most
Glass fibre is washed and dried with methanol afterwards, modified glass fibre is made.
Step 2: by glass fibre and nylon salt in step 1, PA1010 salt 80%, glass fibre 19%, molecular weight
It adjusts 1% dose and deionized water is added in polymeric kettle, reaction kettle is closed, vacuumizes, and then passes to inert gas to reaction kettle
Interior pressure is 0.15Mpa, is warming up to 220 DEG C, and reacting kettle inner pressure reaches 1.4MPa, then pressure maintaining 1.5h is slowly deflated to normal pressure,
260 DEG C are warming up to, reaction 2h is kept, stops heating, the cooling tie rod discharging of water, pelletizing obtain nylon glass fiber pellet.
Step 3: it is 90 μm that nylon glass fiber pellet, which is passed through disintegrating process, and powder average particle size is made after sieving
Nylon glass fiber composite powder, wherein the crushing temperature of pulverizing chamber is controlled at -85 DEG C, and adjusting rotor clearance is 2mm, host
Revolving speed is 4000r/min, and feed rate is controlled at 9kg/ (kWh).
Step 4: the nylon composite glass fiber powder of step 3 and flow promortor, antioxidant are pressed 1:1%:1% matches
Than mixing, sieves after mixing, the nylon glass fiber composite dusty material for selective laser sintering is made.
3 d part is sintered using the obtained nylon glass fiber composite dusty material for selective laser sintering,
And the correlated performance for measuring 3 d part is as shown in table 1.
Embodiment 3
Step 1: being 10 μm by diameter, the glass fibre potassium bichromate and the concentrated sulfuric acid that length is 90 μm carry out at purifying
Reason finally uses the unreacted potassium bichromate of hydrogen peroxide removal and the concentrated sulfuric acid, is washed with distilled water, last filtration drying obtains
To the glass fibre of purification process.By glass fibre, methanol, distilled water, tetraethoxysilane and the poly- first Jing Guo purification process
Radical siloxane is configured to uniform solution, wherein methanol, distilled water, tetraethoxysilane and polymethyl siloxane mass ratio
For 35%: 45%: 5% and 15%.Lasting stirring, reaction temperature are 80 DEG C, and lotion is added in solution.After reacting 3h, most
Glass fibre is washed and dried with alcohol afterwards, modified glass fibre is made.
Step 2: by glass fibre and nylon salt in step 1, caprolactam 80%, glass fibre 28.5%, molecule
Amount adjusts 1.5% dose and deionized water and is added in polymeric kettle, and reaction kettle is closed, vacuumizes, and then passes to inert gas to anti-
Answering pressure in kettle is 0.15Mpa, is warming up to 220 DEG C, and reacting kettle inner pressure reaches 1.4MPa, then pressure maintaining 1.5h is slowly deflated to
Normal pressure is warming up to 260 DEG C, keeps reaction 2h, stops heating, and the cooling tie rod discharging of water, pelletizing obtain nylon glass fiber grain
Material.
Step 3: it is 90 μm that nylon glass fiber pellet, which is passed through disintegrating process, and powder average particle size is made after sieving
Nylon glass fiber composite powder, wherein the crushing temperature of pulverizing chamber is controlled at -85 DEG C, and adjusting rotor clearance is 2mm, host
Revolving speed is 4000r/min, and feed rate is controlled at 9kg/ (kWh).
Step 4: the nylon composite glass fiber powder of step 3 and flow promortor, antioxidant are pressed 1:1%:1% matches
Than mixing, sieves after mixing, the nylon glass fiber composite dusty material for selective laser sintering is made.
3 d part is sintered using the obtained nylon glass fiber composite dusty material for selective laser sintering,
And the correlated performance for measuring 3 d part is as shown in table 1.
Embodiment 4
Step 1: being 15 μm by diameter, the glass fibre potassium bichromate and the concentrated sulfuric acid that length is 100 μm carry out at purifying
Reason finally uses the unreacted potassium bichromate of hydrogen peroxide removal and the concentrated sulfuric acid, is washed with distilled water, last filtration drying obtains
To the glass fibre of purification process.By glass fibre, methanol, distilled water, tetraethoxysilane and the poly- first Jing Guo purification process
Radical siloxane is configured to uniform solution, wherein methanol, distilled water, tetraethoxysilane and polymethyl siloxane mass ratio
For 30%: 40%: 5% and 25%.Lasting stirring, reaction temperature are 90 DEG C, and lotion is added in solution.After reacting 5h, most
Glass fibre is washed and dried with alcohol afterwards, modified glass fibre is made.
Step 2: by glass fibre and PA66 salt in step 1, nylon salt 58%, glass fibre 39.5%, molecular weight
It adjusts 1.5% dose and deionized water is added in polymeric kettle, reaction kettle is closed, vacuumizes, and then passes to inert gas to reaction
Pressure is 0.15Mpa in kettle, is warming up to 235 DEG C, and reacting kettle inner pressure reaches 1.6MPa, pressure maintaining 0.5h, is then slowly deflated to often
Pressure is warming up to 280 DEG C, keeps reaction 0.2h, stops heating, and the cooling tie rod discharging of water, pelletizing obtain nylon glass fiber grain
Material.
Step 3: it is 100 μm that nylon glass fiber pellet, which is passed through disintegrating process, and powder average particle size is made after sieving
Nylon glass fiber composite powder, wherein the crushing temperature of pulverizing chamber is controlled at -70 DEG C, and adjustings rotor clearance is 2mm, is led
Machine revolving speed is 5000r/min, and feed rate is controlled at 12kg/ (kWh).
Step 4: by nylon composite glass fiber powder (nylon and glass fiber quality in composite powder of step 3
Than for： 57.1:42.8) 1 is pressed with flow promortor, antioxidant:2%:2% proportion mixing, sieves after mixing, is made and uses
In the nylon glass fiber composite dusty material of selective laser sintering.
3 d part is sintered using the obtained nylon glass fiber composite dusty material for selective laser sintering,
And the correlated performance for measuring 3 d part is as shown in table 1.
Comparative example 1
Step 1: by PA 66 Powder, glass fibre, antioxidant and flow promortor according to 57.1%:42.8%:2%:
2% proportion mixing, sieves after mixing, obtains nylon glass fiber composite dusty material.
3 d part is sintered using the obtained nylon glass fiber composite dusty material for selective laser sintering,
And the correlated performance for measuring 3 d part is as shown in table 1.
Table 1 is sintered using the nylon glass fiber composite dusty material of selective laser sintering obtained by embodiment 1-4
3 d part correlated performance
Using the obtained nylon glass fiber composite dusty material for being used for selective laser sintering obtained by embodiment 4,
It can be normally sintered workpiece, effect picture after sintering has apparent profile sintering trace as shown in Figure 1, intermediate black portions.Compared to biography
The nylon of system is blended with glass fibre, by the nylon glass for being used for selective laser sintering obtained by preparation method of the present invention
Fiber composite dusty material can complete workpiece sintering well.
Using nylon glass fiber composite dusty material obtained in comparative example 1, it is unable to complete sintering, effect after sintering
Figure is mechanical as shown in Fig. 2, have no sintering trace in oval marked region, and be sintered each not high to intensity of 3 d part
Performance is general.
Numerous embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Do not represent limitations on the scope of the patent of the present invention.For those of ordinary skill in the art, present inventive concept is not being departed from
Under the premise of, various modifications and improvements can be made, and these are all within the scope of protection of the present invention, therefore, the invention patent
The scope of protection shall be subject to the appended claims.
Claims (10)
1. a kind of nylon glass fiber composite powder material preparation method for selective laser sintering, which is characterized in that packet
Include following steps：
Step 1: glass fibre, alcohols solvent, distilled water, tetraethoxysilane and the polysiloxanes Jing Guo purification process are matched
Uniform solution is made, reaction temperature is 70~90 DEG C, lotion is added in the solution, after reacting 1~5h, by glass fibers
Wesy's solvent is washed and is dried, and modified glass fibre is made；
Step 2: by glass fibre, nylon raw material and the molecular weight regulator Jing Guo modification according to 8.5~39.5%: 60
~90%: 0.5~1.5% mass percent is added in deionized water, after carrying out polymerization reaction, then carries out water cooling bracing and cuts
Grain, obtains nylon glass fiber pellet；
Step 3: the nylon glass fiber pellet is passed through deep cooling crush and nylon glass fiber dust is made after sieving；
Step 4: nylon glass fiber dust, antioxidant, flow promortor are uniformly mixed screening, it is made and swashs for selectivity
The nylon glass fiber composite dusty material of light sintering.
2. the nylon glass fiber composite powder preparation method according to claim 1 for selective laser sintering,
It is characterized in that, the mass percent of the nylon glass fiber dust, antioxidant and flow promortor is 1:0.5~2%:0.5
~2%.
3. the nylon glass fiber composite powder preparation method according to claim 2 for selective laser sintering,
Be characterized in that, the alcohols solvent, distilled water, tetraethoxysilane and polysiloxanes mass percent be 30~40%, 40
~50%, 0~10% and 10~30%.
4. the nylon glass fiber composite dusty material preparation side according to claim 3 for selective laser sintering
Method, which is characterized in that the average grain diameter of the glass fibre by purification process is 5~15 μm, and average length is 80~100 μm.
5. the nylon glass fiber composite dusty material preparation side according to claim 4 for selective laser sintering
Method, which is characterized in that the purification process of the glass fibre is specially：It is removed in glass fibre using potassium bichromate and the concentrated sulfuric acid
Impurity, unreacted potassium bichromate and the concentrated sulfuric acid are then removed using hydrogen peroxide, are washed with distilled water, finally crosses and is filtered dry
It is dry, obtain the glass fibre of purification process.
6. the nylon glass fiber composite dusty material preparation side according to claim 5 for selective laser sintering
Method, which is characterized in that the technique of the polymerization reaction is specially：By glass fibre, nylon raw material, molecular weight regulator and go from
Sub- water is added in polymeric kettle, and reaction kettle is closed, vacuumizes, then pass in inert gas to reaction kettle pressure be 0.10~
0.15Mpa is warming up to 190~235 DEG C, then reacting kettle inner pressure is slowly deflated to up to 1.1~1.6MPa, 0.5~3h of pressure maintaining
Normal pressure is warming up to 230~280 DEG C, keeps 0.2~3h of reaction, stops heating.
7. the nylon glass fiber composite dusty material preparation side according to claim 6 for selective laser sintering
Method, which is characterized in that the polysiloxanes is polymethyl siloxane, polyethylsiloxane, polydimethylhydroxysiloxane and gathers
One of phenyl siloxane and a variety of.
8. the nylon glass fiber composite dusty material preparation side according to claim 7 for selective laser sintering
Method, which is characterized in that the partial size of the nylon glass fiber composite powder of the selective laser sintering is 80~100 μm.
9. the nylon glass fiber composite dusty material preparation side according to claim 8 for selective laser sintering
Method, which is characterized in that the technique of the deep cooling crush is specially：For selecting the crushing temperature of pulverizing chamber in the disintegrating process
Between -100~-70 DEG C, adjusting rotor clearance is 2~3mm for control, and engine speed is 4000~5000r/min, feed rate
Control is at 6~12kg/ (kWh).
10. the nylon glass fiber composite powder according to claim 1 to 9 for selective laser sintering
Material preparation method, which is characterized in that the nylon raw material is caprolactam, PA66 salt, PA610 salt, PA612 salt, PA1010
The one or more of salt, PA1012 salt, PA1212 salt and lauric lactam and 11- aminoundecanoic acid.
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