CN109732037A - A kind of 3 D-printing molding sand and preparation method thereof - Google Patents
A kind of 3 D-printing molding sand and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses a kind of 3 D-printing molding sand and preparation method thereof.The molding sand is prepared by the raw material of following parts by weight: 150~300 parts of forsterite sand, 10~20 parts of zircon sand, 10~20 parts of fiame-retardant particles, 6~12 parts of fire retardant, 0.2~2 part of coupling agent, 0.5~5 part of binder, 2~6 parts of dispersant, 0.5~5 part of curing agent.3 D-printing molding sand of the invention improves the deformability and flame retardant effect of molding sand by the way that zircon sand, fiame-retardant particles and fire retardant is added.Meanwhile the mobility, gas permeability and intensity of molding sand are significantly improved in conjunction with forsterite sand, zircon sand by the way that coupling agent, binder, dispersant, curing agent is added.Reacting between liquid magnesium alloy and sand mold is prevented, surface quality of continuous castings is improved, casting flaw is reduced, to obtain the Mg alloy castings for meeting requirement.
Description
Technical field
The present invention relates to a kind of molding sand, a kind of 3 D-printing molding sand and preparation method thereof is concretely related to.
Background technique
Sand casting is an ancient production technology, is for thousands of years always the leading technology for producing casting.Magnesium alloy is
Most light metal material is applied at present, is had broad application prospects in fields such as aerospace, military project and automobiles.Wherein, exist
Aerospace and military industry field, magnesium alloy parts are mostly formed with sand mould casting method at present.In recent years, with scientific and technological progress,
Increasing material manufacturing, Digitized manufacturing are just stepping into conventionally manufactured field.If 3 D-printing (abbreviation 3D printing) technology is used for
The hot investment casting of magnesium alloy forms, and using 3 D-printing casting sand type, containerless casting may be implemented, highly shortened magnesium alloy
Casting cycle simultaneously improves casting dimension accuracy, realizes Digitized manufacturing.
Molding sand is used to the material of moulding in 3 D-printing.Molding sand generally has Foundry sand, moulding sand binder and additional
The Modeling Materials such as object mix according to a certain percentage.Molding sand is different by binder used, can be divided into clay-bonded sand, water-glass sand,
Cement bonded sand, resin sand etc..With the most of clay-bonded sand, water-glass sand and resin sand.Effect of the molding sand in Foundry Production is extremely
It is important, due to the poor quality of molding sand caused by casting wasted product account for about the 30~50% of the total waste product of casting.Usually molding sand is wanted
Seeking Truth: intensity with higher and thermal stability, to bear the effect of various external force and high temperature；Good mobility, i.e. molding sand
The ability being mutually shifted between sand grains under external force or gravity itself；Certain plasticity, i.e. molding sand become under external force
Shape is able to maintain the ability of shape to be administered after external force removal；Preferable gas permeability, i.e. molding sand hole penetrate the energy of gas
Power；High collapsibility, also known as knockability, i.e., whether molding sand is easily destroyed after casting solidification, if is easy to remove from casting
Performance.
But the outstanding problem that current magnesium alloy sand mold casting encounters be since Castings Produce with Furan Resin hot deformability is poor,
The even large-scaled complex castings of some wall unevennesses be easy to cause hot tearing, and casting is caused to scrap；Simultaneously because the chemical property of magnesium is very
Vivaciously, it easily reacts with the water in casting mold, Mg alloy castings surface is caused the defects of cavity and oxidation elephant skin occur, it is significant to drop
The mechanical property and corrosion stability of low magnesium alloy.Therefore in the sand mold of 3 D-printing magnesium alloy cast, it is necessary to develop one kind both
It is avoided that casting cracks, and there is the molding sand mixing technique of high deformability and preferable flame retardant effect to ensure Mg alloy castings matter
Amount undoubtedly has great economic benefit and social benefit.
Summary of the invention
For this purpose, technical problem to be solved by the present invention lies in overcome existing magnesium alloy cast molding sand hot deformability
The technical bottlenecks such as difference, flame retardant effect difference develop one kind and be not only avoided that casting cracked, but also have high deformability and preferable flame retardant effect
3 D-printing molding sand and preparation method thereof.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of 3 D-printing molding sand, is formulated by the raw material of following parts by weight: 150~300 parts of forsterite sand, zirconium
It is 10~20 parts of sand, 10~20 parts of fiame-retardant particles, 6~12 parts of fire retardant, 0.2~2 part of coupling agent, 0.5~5 part of binder, defeated and dispersed
2~6 parts of agent, 0.5~5 part of curing agent.
Preferably, the granularity of the molding sand is 100~300 mesh；
Preferably, the forsterite sand, zircon sand ratio be 15:1；
Preferably, the granularity of the forsterite sand is 100~300 mesh；
Preferably, the granularity of the zircon sand is 100~200 mesh；
Preferably, the constituent and its weight ratio of the fiame-retardant particles are as follows: 10~20 parts of forsterite sand, silicic acid
10~20 parts of aloxite, 2~10 parts of refractory fibre, 2~10 parts of graphite powder；
Preferably, the constituent and its weight ratio of the fiame-retardant particles are as follows: 15 parts of forsterite sand, aluminium silicate sand
15 parts, 6 parts of refractory fibre, 6 parts of graphite powder；
Preferably, it is 40~80% magnesium hydroxide and 20~60% sulphur that the fire retardant, which includes mass fraction,.Institute
It is excessive to state magnesium hydroxide content, sulfur content is very few, sand mold strength reduction, while will lead to mo ld void variation；It is on the contrary then
It will lead to flame retardant effect variation, while also resulting in sand mold gas forming amount and becoming larger；
It is highly preferred that the granularity of the magnesium hydroxide is 50~200 mesh；
It is highly preferred that the granularity of the sulphur is 50~200 mesh；
Preferably, the coupling agent is silane coupling agent KH-560, density 0.98g/cm3；
Preferably, the binder is epoxy adhesive, polyurethane adhesive, acroleic acid binding agent, acrylic acid gather
At least one of urethane anaerobic adhesive；
Preferably, the dispersant is WK type dispersant, in LK type dispersant, JDM type dispersant, JDA type dispersant
It is at least one；
Preferably, the curing agent is diaminocyclohexane curing agent, diaminodiphenyl-methane curing agent, 130 modifications
At least one of curing agent, 592 modified firming agents.
The invention further relates to the preparation methods of the molding sand, comprising the following steps:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator is 200~500rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping when temperature rises to 150~250 DEG C
Then 2~6h of constant temperature is added fiame-retardant particles, and opens high-speed stirred, high-speed stirred revolving speed is 800-1600rpm；
(3) from the feed opening of sand mixer sprinkling fire retardant into above-mentioned mixed material, it is stirred for 10 after sprayed~
30min, adjusts speed of agitator to 200~500rpm later, when temperature of charge is down to 100-200 DEG C, sequentially add coupling agent,
Binder, dispersant, curing agent are stirred for 10~30min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 100~400 mesh, packs,
As 3 D-printing molding sand.
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) in 3 D-printing molding sand of the invention, the zircon sand containing good heat conductive heat dissipation effect, while in preparation process
Added with fiame-retardant particles and fire retardant, improve the deformability and flame retardant effect of molding sand, it can be ensured that core refractoriness it is lasting,
Have no that magnesium alloy class casting cracks, surface quality of continuous castings is improved.
(2) tensile strength is higher than 1.5MPa for 24 hours after sand mold demoulding prepared by the present invention, and the tensile strength after 100h is still high
In 1MPa, meet production requirement.
(3) in 3 D-printing molding sand of the invention, coupling agent, binder, dispersant, curing agent be joined, with magnesium olive
Olive stone sand, zircon sand combine, and significantly improve the mobility, gas permeability and intensity of molding sand, and property is stablized, can be with using the molding sand
Small parts are printed, and product strength is good, precision is high.
Specific embodiment
Below in conjunction with specific experiment data, the technical scheme in the embodiment of the invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those skilled in the art's all other implementation obtained without making creative work
Example, belongs to protection scope of the present invention.
Following embodiment provides a kind of 3 D-printing molding sand, and the molding sand comprises the following components in parts by weight: magnesium olive
150~300 parts of olive stone sand, 10~20 parts of zircon sand, 10~20 parts of fiame-retardant particles, 6~12 parts of fire retardant, 0.2~2 part of coupling agent,
0.5~5 part of binder, 2~6 parts of dispersant, 0.5~5 part of curing agent.
The granularity of the molding sand is 100~300 mesh；
The forsterite sand, zircon sand ratio be 15:1；
The granularity of the forsterite sand is 100~300 mesh；
The granularity of the zircon sand is 100~200 mesh；
The constituent and its weight ratio of the fiame-retardant particles are as follows: 10~20 parts of forsterite sand, aluminium silicate sand 10
~20 parts, 2~10 parts of refractory fibre, 2~10 parts of graphite powder；
The constituent and its weight ratio of the fiame-retardant particles are as follows: 15 parts of forsterite sand, 15 parts of aluminium silicate sand, resistance to
6 parts of fiery fiber, 6 parts of graphite powder；
The fire retardant includes that mass fraction is 40~80% magnesium hydroxide and 20~60% sulphur；
The granularity of the magnesium hydroxide is 50~200 mesh；
The granularity of the sulphur is 50~200 mesh；
The coupling agent is silane coupling agent KH-560, density 0.98g/cm3。
The binder is epoxy adhesive, polyurethane adhesive, acroleic acid binding agent, acroleic acid polyurethane are sick of
At least one of property binder；
The dispersant is WK type dispersant, LK type dispersant, JDM type dispersant, at least one in JDA type dispersant
Kind；
The curing agent be diaminocyclohexane curing agent, diaminodiphenyl-methane curing agent, 130 modified firming agents,
At least one of 592 modified firming agents.
Embodiment 1
Present embodiments provide the molding sand for 3 D-printing, parts by weight composition are as follows: 150 parts of forsterite sand, zircon sand
10 parts, 10 parts of fiame-retardant particles, 6 parts of fire retardant, 0.2 part of coupling agent, 0.5 part of epoxy adhesive, 2 parts of LK type dispersant, two
0.5 part of aminodiphenylmethane curing agent.The constituent and its weight ratio of fiame-retardant particles are as follows: 10 parts of forsterite sand,
10 parts of aluminium silicate sand, 10 parts of refractory fibre, 10 parts of graphite powder；Fire retardant includes the magnesium hydroxide and 60% that mass fraction is 40%
Sulphur.
3 D-printing molding sand in the present embodiment, is prepared by following steps:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator 200rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature when temperature rises to 150 DEG C
Then 6h is added fiame-retardant particles, and opens high-speed stirred, high-speed stirred revolving speed is 800rpm；
(3) it is stirred for 10min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later to 500rpm, when temperature of charge is down to 100 DEG C, sequentially add coupling agent, binder, dispersant,
Curing agent is stirred for 30min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 100 mesh, packs, as three
Tie up printing molding sand.
Embodiment 2
Present embodiments provide the molding sand for 3 D-printing, parts by weight composition are as follows: 300 parts of forsterite sand, zircon sand
20 parts, 20 parts of fiame-retardant particles, 12 parts of fire retardant, 2 parts of coupling agent, 5 parts of acroleic acid binding agent, 6 parts of JDM type dispersant, 592 modifications
5 parts of curing agent.The constituent and its weight ratio of fiame-retardant particles are as follows: 20 parts of forsterite sand, 20 parts of aluminium silicate sand, fire resisting
2 parts of fiber, 2 parts of graphite powder；Fire retardant includes that mass fraction is 80% magnesium hydroxide and 20% sulphur.
3 D-printing molding sand in the present embodiment, is prepared by following steps:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator 500rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature when temperature rises to 250 DEG C
Then 2h is added fiame-retardant particles, and opens high-speed stirred, high-speed stirred revolving speed is 1600rpm；
(3) it is stirred for 30min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later to 200rpm, when temperature of charge is down to 200 DEG C, sequentially add coupling agent, binder, dispersant,
Curing agent is stirred for 10min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 400 mesh, packs, as three
Tie up printing molding sand.
Embodiment 3
Present embodiments provide the molding sand for 3 D-printing, parts by weight composition are as follows: 225 parts of forsterite sand, zircon sand
15 parts, 15 parts of fiame-retardant particles, 8 parts of fire retardant, 1.1 parts of coupling agent, 2.75 parts of polyurethane adhesive, 4 parts of WK type dispersant, diamino
2.75 parts of butylcyclohexane curing agent.The constituent and its weight ratio of fiame-retardant particles are as follows: 15 parts of forsterite sand, alumina silicate
15 parts of sand, 6 parts of refractory fibre, 6 parts of graphite powder；Fire retardant includes that mass fraction is 60% magnesium hydroxide and 40% sulphur.
3 D-printing molding sand in the present embodiment, is prepared by following steps:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator 350rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature when temperature rises to 200 DEG C
Then 4h is added fiame-retardant particles, and opens high-speed stirred, high-speed stirred revolving speed is 1200rpm；
(3) it is stirred for 20min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later to 350rpm, when temperature of charge is down to 150 DEG C, sequentially add coupling agent, binder, dispersant,
Curing agent is stirred for 20min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 250 mesh, packs, as three
Tie up printing molding sand.
Embodiment 4
Present embodiments provide the molding sand for 3 D-printing, parts by weight composition are as follows: 200 parts of forsterite sand, zircon sand
15 parts, 15 parts of fiame-retardant particles, 10 parts of fire retardant, 0.5 part of coupling agent, 2 parts of acroleic acid polyurethane anaerobic adhesive, JDA type burst
4 parts of powder, 2 parts of 130 modified firming agent.The constituent and its weight ratio of fiame-retardant particles are as follows: 15 parts of forsterite sand, silicon
15 parts of sour aloxite, 3 parts of refractory fibre, 3 parts of graphite powder；Fire retardant includes that mass fraction is 50% magnesium hydroxide and 50% sulphur
Sulphur.
3 D-printing molding sand in the present embodiment, is prepared by following steps:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator 300rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature when temperature rises to 200 DEG C
Then 4h is added fiame-retardant particles, and opens high-speed stirred, high-speed stirred revolving speed is 1000rpm；
(3) it is stirred for 20min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later to 300rpm, when temperature of charge is down to 200 DEG C, sequentially add coupling agent, binder, dispersant,
Curing agent is stirred for 20min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 300 mesh, packs, as three
Tie up printing molding sand.
Comparative example 1
Present embodiments provide the molding sand for 3 D-printing, parts by weight composition are as follows: 200 parts of forsterite sand, fire-retardant
10 parts of agent, 3 parts of coupling agent, 6 parts of polyurethane adhesive, 1 part of WK type dispersant, 6 parts of diaminocyclohexane curing agent.Fiame-retardant particles
Constituent and its weight ratio are as follows: 30 parts of forsterite sand, 6 parts of refractory fibre, 6 parts of graphite powder；Fire retardant includes matter
Measuring number is 50% magnesium hydroxide and 50% sulphur.
3 D-printing molding sand in the present embodiment, is prepared by following steps:
(1) forsterite sand is added in sand mixer and is stirred at low speed, speed of agitator 150rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature when temperature rises to 100 DEG C
4h；
(3) it is stirred for 30min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later to 200rpm, when temperature of charge is down to 200 DEG C, sequentially add coupling agent, binder, dispersant,
Curing agent is stirred for 10min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 400 mesh, packs, as three
Tie up printing molding sand.
Comparative example 2
Present embodiments provide the molding sand for 3 D-printing, parts by weight composition are as follows: 200 parts of forsterite sand, zircon sand
15 parts, 10 parts of fire retardant, 2 parts of coupling agent, 5 parts of polyurethane adhesive, 1 part of WK type dispersant, diaminocyclohexane curing agent 3
Part.The constituent and its weight ratio of fiame-retardant particles are as follows: 15 parts of forsterite sand, 12 parts of refractory fibre, 5 parts of graphite powder；
Fire retardant includes that mass fraction is 50% magnesium hydroxide and 50% sulphur.
3 D-printing molding sand in the present embodiment, is prepared by following steps:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator 300rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature when temperature rises to 200 DEG C
4h；
(3) it is stirred for 20min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later to 300rpm, when temperature of charge is down to 200 DEG C, sequentially add coupling agent, binder, dispersant,
Curing agent is stirred for 20min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 300 mesh, packs, as three
Tie up printing molding sand.
Compliance test result:
Molding sand obtained in embodiment 1-4 and comparative example 1-2 is tested for the property, wherein by each embodiment and comparative example
In sand conditioning carry out strength test at casting film part, test result is as shown in table 1.
Table 1
There are many concrete application approach of the present invention, the above is only a preferred embodiment of the present invention.More than it should be pointed out that
Embodiment is merely to illustrate the present invention, and the protection scope being not intended to restrict the invention.For the common skill of the art
For art personnel, without departing from the principle of the present invention, several improvement can also be made, these improvement also should be regarded as this hair
Bright protection scope.
Claims (8)
1. a kind of 3 D-printing molding sand, which is characterized in that the molding sand includes the raw material components of following parts by weight: forsterite
150~300 parts of sand, 10~20 parts of zircon sand, 10~20 parts of fiame-retardant particles, 6~12 parts of fire retardant, 0.2~2 part of coupling agent, bonding
0.5~5 part of agent, 2~6 parts of dispersant, 0.5~5 part of curing agent.
2. 3 D-printing molding sand as described in claim 1, which is characterized in that the granularity of the molding sand is 100~300 mesh.
3. 3 D-printing molding sand as described in claim 1, which is characterized in that the forsterite sand, zircon sand ratio be
15:1.
4. 3 D-printing molding sand as described in claim 1, which is characterized in that the granularity of the forsterite sand be 100~
300 mesh.
5. 3 D-printing molding sand as described in claim 1, which is characterized in that the granularity of the zircon sand is 100~200 mesh.
6. 3 D-printing molding sand as described in claim 1, which is characterized in that the constituent of the fiame-retardant particles and its again
Measure part ratio are as follows: 10~20 parts of forsterite sand, 10~20 parts of aluminium silicate sand, 2~10 parts of refractory fibre, 2~10 parts of graphite powder.
7. 3 D-printing molding sand as described in claim 1, which is characterized in that the fire retardant include mass fraction be 40~
80% magnesium hydroxide and 20~60% sulphur.
8. a kind of method for preparing 3 D-printing molding sand of any of claims 1-7, which is characterized in that including with
Lower step:
(1) forsterite sand, zircon sand are added in sand mixer and are stirred at low speed, speed of agitator is 200~500rpm；
(2) sand mixer carries out heat temperature raising in whipping process, stops heating and keeping constant temperature 2 when temperature rises to 150~250 DEG C
Then~6h is added fiame-retardant particles, and opens high-speed stirred, high-speed stirred revolving speed is 800-1600rpm；
(3) it is stirred for 10~30min after sprayed into above-mentioned mixed material from the feed opening of sand mixer sprinkling fire retardant,
Speed of agitator is adjusted later sequentially adds coupling agent, bonding when temperature of charge is down to 100-200 DEG C to 200~500rpm
Agent, dispersant, curing agent are stirred for 10~30min after charging completely；
(4) material to be mixed takes out after being cooled to room temperature, and is ground into the particle that particle size is 100~400 mesh, packs, as
3 D-printing molding sand.
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| CN201910159784.5A CN109732037B (en) | 2019-03-04 | 2019-03-04 | Molding sand for three-dimensional printing and preparation method thereof |
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| CN110586848A (en) * | 2019-10-22 | 2019-12-20 | 康硕(德阳)智能制造有限公司 | Sand mold material for 3D printing cast steel, preparation method thereof and method for manufacturing cast steel sand mold by using material |
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| Publication number | Publication date |
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| CN109732037B (en) | 2020-11-13 |
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