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 PDF

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CN108912674A
CN108912674A CN201810569893.XA CN201810569893A CN108912674A CN 108912674 A CN108912674 A CN 108912674A CN 201810569893 A CN201810569893 A CN 201810569893A CN 108912674 A CN108912674 A CN 108912674A
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nylon
glass fiber
glass fibre
fiber composite
selective laser
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文杰斌
徐文雅
潘强
袁博
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Hunan Farsoon High Tech Co Ltd
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    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • C08J5/08Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B33ADDITIVE MANUFACTURING TECHNOLOGY
    • B33YADDITIVE 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
    • B33Y70/00Materials specially adapted for additive manufacturing
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    • C08J2377/00Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/02Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2377/00Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/002Physical properties
    • C08K2201/003Additives being defined by their diameter
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/002Physical properties
    • C08K2201/004Additives being defined by their length
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00Use of ingredients characterised by shape
    • C08K7/02Fibres or whiskers
    • C08K7/04Fibres or whiskers inorganic
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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

Nylon glass fiber composite powder material preparation method for selective laser sintering
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.
CN201810569893.XA 2018-06-05 2018-06-05 Nylon glass fiber composite powder material preparation method for selective laser sintering Pending CN108912674A (en)

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