CN106964749A - It is a kind of that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar - Google Patents
It is a kind of that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar Download PDFInfo
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- CN106964749A CN106964749A CN201710128229.7A CN201710128229A CN106964749A CN 106964749 A CN106964749 A CN 106964749A CN 201710128229 A CN201710128229 A CN 201710128229A CN 106964749 A CN106964749 A CN 106964749A
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- sand
- laser sintered
- precoated sand
- sugar
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/26—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of carbohydrates; of distillation residues therefrom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The invention discloses a kind of method for preparing laser sintered 3D printing precoated sand with sugar for the hot method of adhesive, it is characterized in that, first, after nice foundry sand is cleaned with water, in the aqueous solution for being immersed in the dodecyl sodium sulfate that mass percentage concentration is 1 ~ 3%, room temperature places 30h, separation of solid and liquid, dry, obtain pre-processing nice foundry sand；Then, in the reactor, added by mass percentage concentration, pre-process nice foundry sand：90% ~ 95%, strong stirring, temperature rises to 110 ± 2 DEG C, adds stearmide：0.5% ~ 3%, 20min is stirred, temperature continues to rise to 190 ± 2 DEG C, adds white sugar：3% ~ 8%, trien：0.2% ~ 2.0%, polyethylene glycol：0.2% ~ 2.0%, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding, obtains laser sintered 3D printing precoated sand.The precoated sand using it is laser sintered can straight forming, good fluidity, formed precision is high and simple with technique, and production cost is low, it is easy to industrialized production.
Description
Technical field
The present invention relates to a kind of preparation method of laser sintered 3D printing rapid shaping powder body material, belong to rapid shaping
Material Field, it is more particularly to a kind of that the method for laser sintered 3D printing precoated sand is prepared and laser sintered for the hot method of adhesive with sugar
3D printing is molded.
Background technology
Sugar is the refined sugar that the molasses squeezed out by sugarcane and beet are made, and is by each molecular dehydration contracting of glucose and fructose
The disaccharide for the irreducibility closed, is heated to 160 DEG C, is just melted into thick transparent liquid, is crystallized again during cooling.
Extending heating time, sucrose is to be decomposed into glucose and anhydrofructose.Under 190 ~ 220 DEG C of higher temperature, sucrose is just dehydrated
Condensation turns into caramel.Caramel has very strong cementation, can make powder adhesion together, play a part of binding agent.Adopt
Chemical adhesive is replaced as adhesive with sugar, problem of environmental pollution is reduced.
Nice foundry sand also known as electric smelting haydite, are the senior substitutes of quartz sand.The advantage of quartz sand is widely distributed, cost
It is cheap；But its shortcoming is also quite obvious：One is that the coefficient of expansion is big, and casting accuracy is low；Two be that scab is serious, and sand removal is stranded
It is difficult.Its is studied carefully because being that quartz has a variety of allomorphism generations at different temperature, Volume Changes are big；By refractoriness (stone
The refractoriness of sand is between 1400 ~ 1700 DEG C) limitation, casting is local（The position that hole, groove and thermal center are concentrated）It is viscous
Sand is serious, clears up very difficult.Disadvantages mentioned above is particularly acute in the production of large-scale steel-casting.Nice foundry sand can overcome these to lack
Point, so as to substantially increase the quality of casting.Nice foundry sand be using fine aluminum vanadine as raw material, through calcining, electric smelting, granulation, point
Sieve etc. technique and be made.
Precoated sand（coated sand）.Sand grain surface is covered with the molding sand or core sand of one layer of hard resin film before moulding.
There are two kinds of coating techniques of cold process and Re Fa：Cold process ethanol dissolves resin, and adds methenamine during mulling, makes two
Person is coated on sand grain surface, and ethanol volatilization obtains precoated sand；Sand is preheating to certain temperature by hot method, plus resin melts it, stirring
Make resin-coating in sand grain surface, plus the methenamine aqueous solution and lubricant, cool down, crush, sieving and to obtain precoated sand.For casting
Steel part, ironcasting.Precoated sand is invented by German clo doctor Ning during World War II, and its technical process is by powdery
Thermosetting phenolic resin and nice foundry sand mechanical mixture, solidify during heating.After develop into it is solid with thermoplastic phenolic resin plus latency
Agent（Methenamine）Precoated sand is configured to by certain coating technique with lubricant, sand grains is coated on when precoated sand is heated
The resin melting on surface, in the presence of the methylene that methenamine is decomposited, the resin of melting is changed rapidly by linear structure
Into the three-dimensional-structure not melted, so that precoated sand curing molding.
Laser sintered 3D printing belongs to a kind of method of increasing material manufacturing.This technique is also, using laser as energy source, to lead to
Crossing laser beam makes the powder of plastics, wax, ceramics, metal or its compound equably be sintered in processing plane.On the table
Uniform layer overlay very thin powder as raw material, laser beam under control of the computer, by scanner with certain speed
Scanned with energy density by the 2-D data in layering face.After laser beam flying, the powder of relevant position is just sintered into necessarily
The entity lamella of thickness, the place do not scanned remains in that loose powdered.After this layer scanned, then need under
One layer is scanned.It is to be layered thickness and reduce workbench first to cut thickness degree according to object, and powdering roller again spreads powder
It is flat, new one layer of scanning can be started.So repeatedly, until scanning through structure at all levels.Remove excessive powder, and through locating later
Reason, you can obtain product.
In existing moulding material field, the structure for having raw material sources various with part due to SLS rapid shaping techniques
Build the time it is shorter the advantages of, therefore have wide application in rapid shaping field.But most of is organic material and composite wood
A kind of nylon powder material for laser sintering and moulding product is disclosed in material, Chinese invention patent CN1379061A, is passed through
Chemical synthesis and the improvement of technique, are handled the surface of nylon powder material, and it is excellent to have obtained sintering character, moulded products
Intensity is high, and the product of good toughness simplifies the preparation technology of laser sintered nylon material, reduces cost；Chinese invention patent
A kind of laser sintered 3D manufacturing technologies stone plastic composite powder end and preparation method thereof is disclosed in CN103881371.
The application is by with carbohydrate gum stick hot coating, to modified nice foundry sand surface, obtaining precoated sand can directly use
Laser sintered 3D printing shaping.Adhesive need not be sprayed in forming process.Advantage is that adhesive consumption greatly reduces, and reduces ring
Border is polluted, and the quality of product is high.Precoated sand adhesive coating prepared by the technique of the application is uniform, and surface is smooth, good fluidity,
It is adapted to laser sintered 3D printing shaping.In addition, the preparation method that the application is provided is simple, cost is low.
The content of the invention
The mesh of the present invention is to provide a kind of method for preparing laser sintered 3D printing precoated sand with sugar for the hot method of adhesive, soon
Rapid-result type precoated sand need not spray binding agent can Direct Laser scanning shaping；
The purpose of the present invention is achieved through the following technical solutions.
A kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar, it is characterised in that this method
With following processing step：
（1）Nice foundry sand is pre-processed：After nice foundry sand is cleaned with water, the dodecyl sodium sulfonate that mass percentage concentration is 1 ~ 3% is immersed in
In the aqueous solution of sodium, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, added by mass percentage concentration, pre-process nice foundry sand：
90% ~ 95%, strong stirring, temperature rises to 110 ± 2 DEG C, adds stearmide：0.5% ~ 3%, 20min is stirred, temperature continues to raise
To 190 ± 2 DEG C, white sugar is added：3% ~ 8%, trien：0.2% ~ 2.0%, polyethylene glycol：0.2% ~ 2.0%, each group divides it
With for absolutely, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding crosses 160 mesh sieves, obtains laser
Sinter 3D printing precoated sand.
In step（1）Described in nice foundry sand particle diameter in the range of 180 ~ 260 mesh.
In step（1）Described in nice foundry sand and dodecyl sodium sulfate the aqueous solution solid-to-liquid ratio be 1g：3 ~ 5mL scopes
It is interior.
In step（2）Described in polyethylene glycol be polyethylene glycol 200 or polyethylene glycol 400.
In step（2）Described in polyethylene glycol and trien mass ratio be 1：1.
In step（2）Described in white sugar be edible soft white sugar or white granulated sugar.
Particle size test method of the present invention is the granularity equivalent diameter size measured using laser particle analyzer.
The present invention compared with the prior art, has the following advantages that and beneficial effect：
（1）The laser sintered 3D printing precoated sand that the present invention is obtained, using sugar as adhesive coating on nice foundry sand surface, green
Environmental protection, it is not necessary to which spraying binding agent can straight forming under the conditions of laser sintered.
（2）The laser sintered 3D printing precoated sand that the present invention is obtained, the uniform particle sizes of particle, sphericity is high, good fluidity
The characteristics of, property is stable；Thin-walled model or small parts can be manufactured by this rapid shaping powder material, product is produced
High with surface gloss, intensity is good, the features such as precision is high.
（3）The laser sintered 3D printing precoated sand that the present invention is obtained, simple with preparation technology, condition is easily controllable, raw
Cost is produced low, it is easy to industrialized production, it is easy to store, the advantages of pollution-free.
Embodiment
Embodiment 1
（1）Nice foundry sand is pre-processed：After 1000g nice foundry sands are cleaned with water, be immersed in 3000mL mass percentage concentrations be 1% ten
In the aqueous solution of dialkyl sulfonates, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, pretreatment nice foundry sand is added：900g, strong stirring, temperature
Degree rises to 110 ± 2 DEG C, adds stearmide：16g, stirs 20min, and temperature continues to rise to 190 ± 2 DEG C, adds white sugar：
80g, trien：2g, polyethylene glycol：2g, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding,
160 mesh sieves are crossed, laser sintered 3D printing precoated sand is obtained.
Embodiment 2
（1）Nice foundry sand is pre-processed：After 1000g nice foundry sands are cleaned with water, be immersed in 4000mL mass percentage concentrations be 2% ten
In the aqueous solution of dialkyl sulfonates, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, pretreatment nice foundry sand is added：930g, strong stirring, temperature
Degree rises to 110 ± 2 DEG C, adds stearmide：10g, stirs 20min, and temperature continues to rise to 190 ± 2 DEG C, adds white sugar：
50g, trien：5g, polyethylene glycol：5g, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding,
160 mesh sieves are crossed, laser sintered 3D printing precoated sand is obtained.
Embodiment 3
（1）Nice foundry sand is pre-processed：After 1000g nice foundry sands are cleaned with water, be immersed in 5000mL mass percentage concentrations be 3% ten
In the aqueous solution of dialkyl sulfonates, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, pretreatment nice foundry sand is added：950g, strong stirring, temperature
Degree rises to 110 ± 2 DEG C, adds stearmide：6g, stirs 20min, and temperature continues to rise to 190 ± 2 DEG C, adds white sugar：30g,
Trien：7g, polyethylene glycol：7g, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding, mistake
160 mesh sieves, obtain laser sintered 3D printing precoated sand.
Embodiment 4
（1）Nice foundry sand is pre-processed：After 1000g nice foundry sands are cleaned with water, it is 2.5% to be immersed in 3500mL mass percentage concentrations
In the aqueous solution of dodecyl sodium sulfate, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, pretreatment nice foundry sand is added：920g, strong stirring, temperature
Degree rises to 110 ± 2 DEG C, adds stearmide：10g, stirs 20min, and temperature continues to rise to 190 ± 2 DEG C, adds white sugar：
40g, trien：20g, polyethylene glycol：10g, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, ground
Mill, crosses 160 mesh sieves, obtains laser sintered 3D printing precoated sand.
Embodiment 5
（1）Nice foundry sand is pre-processed：After 1000g nice foundry sands are cleaned with water, it is 1.5% to be immersed in 4500mL mass percentage concentrations
In the aqueous solution of dodecyl sodium sulfate, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, pretreatment nice foundry sand is added：930g, strong stirring, temperature
Degree rises to 110 ± 2 DEG C, adds stearmide：7g, stirs 20min, and temperature continues to rise to 190 ± 2 DEG C, adds white sugar：30g,
Trien：3g, polyethylene glycol：20g, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding, mistake
160 mesh sieves, obtain laser sintered 3D printing precoated sand.
Application method：Laser sintered 3D printing precoated sand is added in the confession powder cylinder of selective laser sintering and moulding machine,
Dusty material is equably layered in processing plane and is heated to processing temperature by powdering roller, and laser sends laser, calculates
The switch of machine control laser and the angle of scanner so that laser beam is in processing plane according to corresponding two-dimensional slice shape
It is scanned, after laser beam is inswept, workbench moves down a thickness, then powdering, laser beam flying, so repeatedly, is swashed
Light sintered part；The mode that wherein laser beam is scanned in processing plane scans for subregion, and laser power is 80 ~ 100W, scanning
Speed is 1500mm/s, and sweep span is 0.1 ~ 0.15mm, and lift height is 0.10 ~ 0.2mm, preheating temperature：100 DEG C, processing
Temperature is 200 ~ 210 DEG C.
Claims (6)
1. a kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar, it is characterised in that this method has
There is following processing step：
（1）Nice foundry sand is pre-processed：After nice foundry sand is cleaned with water, the dodecyl sodium sulfonate that mass percentage concentration is 1 ~ 3% is immersed in
In the aqueous solution of sodium, room temperature places 30h, and separation of solid and liquid is dried, and obtains pre-processing nice foundry sand；
（2）It is prepared by laser sintered 3D printing precoated sand：In the reactor, added by mass percentage concentration, pre-process nice foundry sand：
90% ~ 95%, strong stirring, temperature rises to 110 ± 2 DEG C, adds stearmide：0.5% ~ 3%, 20min is stirred, temperature continues to raise
To 190 ± 2 DEG C, white sugar is added：3% ~ 8%, trien：0.2% ~ 2.0%, polyethylene glycol：0.2% ~ 2.0%, each group divides it
With for absolutely, temperature rises to 210 ± 2 DEG C, and strong stirring 30min is cooled to room temperature, grinding crosses 160 mesh sieves, obtains laser
Sinter 3D printing precoated sand.
2. a kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar according to claim 1,
Characterized in that, step（1）Described in nice foundry sand particle diameter in the range of 180 ~ 260 mesh.
3. a kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar according to claim 1,
Characterized in that, step（1）Described in nice foundry sand and dodecyl sodium sulfate the aqueous solution solid-to-liquid ratio be 1g：3 ~ 5mL models
In enclosing.
4. a kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar according to claim 1,
Characterized in that, step（2）Described in polyethylene glycol be polyethylene glycol 200 or polyethylene glycol 400.
5. a kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar according to claim 1,
Characterized in that, step（2）Described in polyethylene glycol and trien mass ratio be 1：1.
6. a kind of method that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar according to claim 1,
Characterized in that, step（2）Described in white sugar be edible soft white sugar or white granulated sugar.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710128229.7A CN106964749B (en) | 2017-03-06 | 2017-03-06 | One kind is that the hot method of adhesive prepares laser sintered 3D printing precoated sand with sugar |
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|---|---|---|---|
| CN201710128229.7A CN106964749B (en) | 2017-03-06 | 2017-03-06 | One kind is that the hot method of adhesive prepares laser sintered 3D printing precoated sand with sugar |
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| CN106964749A true CN106964749A (en) | 2017-07-21 |
| CN106964749B CN106964749B (en) | 2018-07-31 |
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| WO2015029935A1 (en) * | 2013-08-30 | 2015-03-05 | 旭有機材工業株式会社 | Molding method for laminated mold |
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| CN105195679A (en) * | 2015-09-21 | 2015-12-30 | 济南大学 | Preparing method for fast forming epoxy resin coated sand used for 3D printing |
| CN105215281A (en) * | 2015-09-21 | 2016-01-06 | 济南大学 | A kind of preparation method printing quartzy precoated sand for 3D |
-
2017
- 2017-03-06 CN CN201710128229.7A patent/CN106964749B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040197558A1 (en) * | 2003-04-01 | 2004-10-07 | Gun Ei Chemical Industry Co., Ltd. | Resin-coated sand |
| CN103567352A (en) * | 2012-07-30 | 2014-02-12 | 广西玉柴机器股份有限公司 | Production technology of precoated sand for selective laser sintering and quick molding technology |
| WO2015029935A1 (en) * | 2013-08-30 | 2015-03-05 | 旭有機材工業株式会社 | Molding method for laminated mold |
| CN104107875A (en) * | 2014-07-30 | 2014-10-22 | 吴江市液铸液压件铸造有限公司 | Furan resin self-hardening sand and preparation method thereof |
| CN105195667A (en) * | 2015-09-21 | 2015-12-30 | 济南大学 | Preparation method of 3D printing rapid-prototyping precoated sand |
| CN105195679A (en) * | 2015-09-21 | 2015-12-30 | 济南大学 | Preparing method for fast forming epoxy resin coated sand used for 3D printing |
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