CN105215281A - A kind of preparation method printing quartzy precoated sand for 3D - Google Patents
A kind of preparation method printing quartzy precoated sand for 3D Download PDFInfo
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- CN105215281A CN105215281A CN201510602076.6A CN201510602076A CN105215281A CN 105215281 A CN105215281 A CN 105215281A CN 201510602076 A CN201510602076 A CN 201510602076A CN 105215281 A CN105215281 A CN 105215281A
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Abstract
The invention discloses one and print quartzy precoated sand preparation method for 3D, it is characterized in that, after first being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1 ~ 2%, dry, obtains pretreatment quartz sand; Then, in mixer, add by mass percentage, pretreatment quartz sand: 75% ~ 80%, epoxy resin: 3.5% ~ 6.5%, stearic amide: 0.2% ~ 0.8%, oleamide: 0.1% ~ 0.4%, pyromellitic dianhydride amine: 0.3% ~ 1.0%, septichen phenyl ester: 1.0% ~ 3.0%, add acetone again: 10% ~ 15%, each component sum is absolutely, opens grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.This precoated sand can straight forming under laser sintered, and have preparation technology simple, condition is easy to control, and adhesive consumption is few, and production cost is low, is easy to suitability for industrialized production.
Description
Technical field
The present invention relates to a kind of preparation method of precoated sand, belong to the Material Field of rapid shaping, particularly a kind of preparation method and application printing quartzy precoated sand for 3D.
Background technology
Quartz sand is the quartz particles that quartz processes through fragmentation, and quartz is a kind of nonmetallic mineral, and be a kind of silicate mineral of hard, wear-resisting, stable chemical performance, its main mineral constituent is SiO
2, the color of quartz sand is milky or semi-transparent clear shape, Mohs' hardness 7, and quartz sand is important industrial mineral raw material, and non-chemically dangerous material, are widely used in glass, casting, pottery and refractory material etc.
Precoated sand is molding sand or the core sand that namely sand grain surface is covered with one deck hard resin film before moulding.Have cold process and Re Fa two kinds of coating techniques: cold process ethanol by resin dissolves, and adds methenamine in mulling process, make the two be coated on sand grain surface, ethanol volatilizees, and obtains precoated sand; Hot method is preheating to uniform temperature sand, adds resin and makes its melting, stirs and makes resin-coating at sand grain surface, add the methenamine aqueous solution and lubricant, cooling, broken, sieve to obtain precoated sand.For steel-casting, ironcasting.
Precoated sand is invented during World War II by German clo doctor Ning, and its technical process is by the thermosetting phenolic resin of powdery and quartz sand mechanical mixture, solidifies during heating.After develop into and add latent curing agent (methenamine) with novolac resin and lubricant is mixed with precoated sand by certain coating technique, the resin melting of sand grain surface is coated on when precoated sand is heated, under the effect of the methylene decomposited at methenamine, the resin of melting is transformed into rapidly the three-dimensional-structure of not melting by linear structure, thus makes precoated sand curing molding.
The precoated sand technology of China starts from mid-term the 1950's, and the sixties once once stopped using.Enter the eighties, due to the needs with engineering goods outlet that develop rapidly of auto industry, the quality of foundry goods is had higher requirement, thus facilitate the fast development of precoated sand production and application technology.The precoated sand factory of initial stage nineties all parts of the country develops rapidly, new product, new technology continue to bring out, to 21 century, the year volume of production and marketing of China's precoated sand industry has reached more than 900,000 tons, be widely used in motor cylinder block, cylinder cap, inlet manifold, the production of the various intricate castings such as all kinds of pipe fitting, the pump housing.
3D prints (3Dprinting), is a kind of based on mathematical model file, use flow-like, Powdered, silk (rod) shape etc. curable, bond, alloying material, carried out the technology of constructed object by the mode of successively solidifying, bonding, fusing.The field such as Making mold, industrial design of being everlasting is used to modeling, after gradually for the direct manufacture of some products, had the parts using this technology to print.This technology is at jewelry, footwear, industrial design, building, engineering and construction (AEC), automobile, and Aero-Space, dentistry and medical industries, education, GIS-Geographic Information System, civil engineering, gun and other field are applied all to some extent.3D printing technique appears at the mid-90 in 20th century, is actually the up-to-date rapid molding device of technology such as utilizing photocuring and ply of paper to fold.It is substantially identical with common print operation principle, and printer, built with liquid or powder etc. " printed material ", after being connected, is stacked up " printed material " by conputer controlled from level to level with computer, finally the blueprint on computer is become in kind.This printing technique is called 3D three-dimensional printing technology.Traditional manufacture generally needs to cut raw material or hole, and namely subtracts material manufacture, can be mass-produced; It is by material stacking bonding, fusion from level to level that 3D prints, and namely increases material manufacture; Quick individual character manufacturing can be realized, the shape that traditional manufacture cannot complete can be produced.
In existing moulding material field, because SLS (selective laser sintering) rapid shaping technique has the advantages such as raw material sources various and structure time that is part is shorter, therefore have in rapid shaping field and apply more widely.A kind of nylon powder material for laser sintering and moulding goods is disclosed in Chinese invention patent CN1379061A, by the improvement of chemical synthesis and technique, the surface of nylon powder material is processed, obtain sintering character excellent, moulded products intensity is high, the product of good toughness, simplifies the preparation technology of laser sintered nylon material, reduces cost; Disclose a kind of production technology of selective laser sintering rapid forming precoated sand in Chinese invention patent CN103567352A, adopt the method for hot film to prepare by novolac resin, methenamine, calcium stearate and coupling agent KH-550.
The laser sintered a kind of method belonging to increasing material and manufacture.This technique is also take laser instrument as energy source, by laser beam, the powder of plastics, wax, pottery, metal or its compound is sintered equably on processing plane.The powder of uniform spreading last layer very thin (submillimeter level) is as raw material on the table, and laser beam under control of the computer, is scanned by the 2-D data of point aspect with certain speed and energy density by scanner.After laser beam flying, the powder of relevant position just sinters certain thickness entity lamella into, and the place do not scanned still keeps loose Powdered.After this one deck is scanned, need subsequently to scan lower one deck.First cut layer thickness and layering thickness according to object and reduce workbench, powder is paved by paving powder cylinder again, can start the scanning of new one deck.So repeatedly, until scanned structure at all levels.Remove excessive powder, and through post processing, can product be obtained.
The present invention is by carrying out surface modification to quartz sand, by high molecular adhesive coating to quartz sand surface, be add the energy but also the gas that can absorb in forming process that reducing agent not only can increase precoated sand absorbing laser in coating, obtain a kind of low precoated sand of getting angry of high strength of applicable laser sintering rapid forming.This material can be shaped precision, abnormal shape, complicated parts quickly and easily, does not need to spray bonding agent, greatly simplifies and just do program.In addition, the method that this patent provides is simple, and cost is low.
Summary of the invention
Order of the present invention is to provide one and prints quartzy precoated sand for 3D, and object of the present invention is achieved through the following technical solutions.
A kind of 3D that is used for prints quartzy precoated sand preparation method, and it is characterized in that, the method has following processing step:
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1 ~ 2%, and room temperature is placed 10 ~ 12 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, add by mass percentage, pretreatment quartz sand: 75% ~ 80%, epoxy resin: 3.5% ~ 6.5%, stearic amide: 0.2% ~ 0.8%, oleamide: 0.1% ~ 0.4%, pyromellitic dianhydride amine: 0.3% ~ 1.0%, septichen phenyl ester: 1.0% ~ 3.0%, open mixer rotating speed at 200 revs/min, grinding 10min, then add acetone: 10% ~ 15%, each component sum is absolutely, open grinder rotating speed at 250 revs/min, grinding 30min, dry, obtain 3D and print quartzy precoated sand.
The particle diameter of quartz sand described is in step (1) within the scope of 80 ~ 100 orders.
Epoxy resin described in step (2) is solid photosensitive epoxy resin resin.
Stearic amide described in step (2) and the mass ratio of oleamide are at 1:0.3 ~ 0.5 scope optimum.
Granularity of the present invention is determined by sieving.
Another object of the present invention is to provide 3D and prints the application shaping on 3D printer of quartzy precoated sand, feature is: 3D is printed quartzy precoated sand and join in the confession powder cylinder of selective laser sintering and moulding machine, dusty material to be layered on processing plane and to be heated to processing temperature by paving powder roller equably, laser instrument sends laser, the switch of computer controlled laser and the angle of scanner, the two-dimentional sheet-shaped of laser beam according to correspondence on processing plane is scanned, after laser beam is inswept, workbench moves down a thickness, repave powder, laser beam flying, so repeatedly, obtain laser sintered, the mode that wherein laser beam scans on processing plane is subregion scanning, and laser power is 40W, and sweep speed is 1500mm/s, and sweep span is 0.1 ~ 0.15mm, and lift height is 0.10 ~ 0.2mm, preheat temperature: 50 DEG C, and processing temperature is 140 ~ 160 DEG C.
Compared with the prior art, tool has the following advantages and beneficial effect in the present invention:
(1) the present invention obtains 3D and prints quartzy precoated sand, and not needing to spray binding agent can straight forming under laser sintered condition.
(2) the present invention obtains 3D and prints quartzy precoated sand, stable in properties, lowly gets angry; Producing product, to have surface gloss high, precision high.
(3) the present invention obtains 3D and prints quartzy precoated sand, has preparation technology simple, and condition is easy to control, and production cost is low, is easy to suitability for industrialized production, and film is even, has again the advantage such as low-carbon environment-friendly and economize energy.
(4) the present invention obtains 3D and prints quartzy precoated sand, has adhesive consumption few, inadherent advantage.
Detailed description of the invention
Embodiment 1
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1.5%, and room temperature places 11 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, adds respectively, pretreatment quartz sand: 78g, epoxy resin: 5g, stearic amide: 0.6g, oleamide: 0.3g, pyromellitic dianhydride amine: 0.5g, septichen phenyl ester: 2.0g, opens mixer rotating speed at 200 revs/min, grinding 10min, add acetone again: 13mL, open grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.
Embodiment 2
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1.0%, and room temperature places 12 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, adds respectively, pretreatment quartz sand: 80g, epoxy resin: 6g, stearic amide: 0.4g, oleamide: 0.2g, pyromellitic dianhydride amine: 0.3g, septichen phenyl ester: 3.0g, opens mixer rotating speed at 200 revs/min, grinding 10min, add acetone again: 10mL, open grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.
Embodiment 3
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 2.0%, and room temperature places 10 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, adds respectively, pretreatment quartz sand: 75g, epoxy resin: 4g, stearic amide: 0.2g, oleamide: 0.1g, pyromellitic dianhydride amine: 0.8g, septichen phenyl ester: 1.0g, opens mixer rotating speed at 200 revs/min, grinding 10min, add acetone again: 19mL, open grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.
Embodiment 4
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1.2%, and room temperature places 12 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, adds respectively, pretreatment quartz sand: 76g, epoxy resin: 6.5g, stearic amide: 0.8g, oleamide: 0.4g, pyromellitic dianhydride amine: 1.0g, septichen phenyl ester: 2.0g, opens mixer rotating speed at 200 revs/min, grinding 10min, add acetone again: 14mL, open grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.
Embodiment 5
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1.8%, and room temperature places 10 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, adds respectively, pretreatment quartz sand: 75g, epoxy resin: 3.5g, stearic amide: 0.2g, oleamide: 0.1g, pyromellitic dianhydride amine: 0.5g, septichen phenyl ester: 2.0g, opens mixer rotating speed at 200 revs/min, grinding 10min, add acetone again: 18mL, open grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.
Embodiment 6
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1.5%, and room temperature places 11 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, adds respectively, pretreatment quartz sand: 800g, epoxy resin: 40g, stearic amide: 6g, oleamide: 3g, pyromellitic dianhydride amine: 5g, septichen phenyl ester: 20g, opens mixer rotating speed at 200 revs/min, grinding 10min, add acetone again: 100mL, open grinder rotating speed at 250 revs/min, grinding 30min, drying, obtains 3D and prints quartzy precoated sand.
Embodiment 7
Using method: 3D is printed quartzy precoated sand and join in the confession powder cylinder of selective laser sintering and moulding machine, dusty material to be layered on processing plane and to be heated to processing temperature by paving powder roller equably, laser instrument sends laser, the switch of computer controlled laser and the angle of scanner, the two-dimentional sheet-shaped of laser beam according to correspondence on processing plane is scanned, after laser beam is inswept, workbench moves down a thickness, repave powder, laser beam flying, so repeatedly, laser sintered is obtained; The mode that wherein laser beam scans on processing plane is subregion scanning, and laser power is 40W, and sweep speed is 1500mm/s, sweep span is 0.1 ~ 0.15mm, and lift height is 0.10 ~ 0.2mm, preheat temperature: 50 DEG C, processing temperature is 140 ~ 160 DEG C, and shaping precision is high.
Claims (5)
1. print a quartzy precoated sand preparation method for 3D, it is characterized in that, the method has following processing step:
(1) quartz sand pretreatment: after being cleaned by quartz sand use water, being immersed in mass percentage concentration is in the aqueous solution of the dodecyl sodium sulfate of 1 ~ 2%, and room temperature is placed 10 ~ 12 hours, filters, is washed with water to neutrality, dry, obtains pretreatment quartz sand;
(2) 3D prints quartzy precoated sand: in mixer, add by mass percentage, pretreatment quartz sand: 75% ~ 80%, epoxy resin: 3.5% ~ 6.5%, stearic amide: 0.2% ~ 0.8%, oleamide: 0.1% ~ 0.4%, pyromellitic dianhydride amine: 0.3% ~ 1.0%, septichen phenyl ester: 1.0% ~ 3.0%, open mixer rotating speed at 200 revs/min, grinding 10min, then add acetone: 10% ~ 15%, each component sum is absolutely, open grinder rotating speed at 250 revs/min, grinding 30min, dry, obtain 3D and print quartzy precoated sand.
2. one according to claim 1 prints quartzy precoated sand preparation method for 3D, and it is characterized in that, the particle diameter of the quartz sand described in step (1) is within the scope of 80 ~ 100 orders.
3. one according to claim 1 prints quartzy precoated sand preparation method for 3D, and it is characterized in that, the epoxy resin described in step (2) is solid photosensitive epoxy resin resin.
4. one according to claim 1 prints quartzy precoated sand preparation method for 3D, it is characterized in that, the mass ratio of the stearic amide described in step (2) and oleamide is optimum in 1:0.3 ~ 0.5 scope.
5. a kind of 3D printed prepared by quartzy precoated sand preparation method for 3D according to claim 1 prints quartzy precoated sand, it is characterized in that, this precoated sand is used for laser sintered 3D and prints rapid shaping.
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| CN106391993A (en) * | 2016-09-07 | 2017-02-15 | 济南大学 | Preparation method of rapid formation coated sand for 3DP printing |
| CN106964749A (en) * | 2017-03-06 | 2017-07-21 | 济南大学 | It is a kind of that laser sintered 3D printing precoated sand is prepared for the hot method of adhesive with sugar |
| CN111151710A (en) * | 2020-01-16 | 2020-05-15 | 夏文松 | Environment-friendly precoated sand casting process |
| CN111590016A (en) * | 2020-06-05 | 2020-08-28 | 洛阳凯林铸材有限公司 | Laser 3D printing precoated sand and production method thereof |
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