CN108911664A - The preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould - Google Patents
The preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould Download PDFInfo
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- CN108911664A CN108911664A CN201810759039.XA CN201810759039A CN108911664A CN 108911664 A CN108911664 A CN 108911664A CN 201810759039 A CN201810759039 A CN 201810759039A CN 108911664 A CN108911664 A CN 108911664A
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- preparation
- slurry
- land plaster
- high strength
- nanometer scale
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould, using land plaster as main material, the auxiliary agent being added into gypsum powder raw material include anti-corrosion agent, retarder, the pore creating material of land plaster weight 8-12% and 3-5% reinforcing agent, according to the weight ratio of land plaster and water be 1:Land plaster, auxiliary agent and water uniform stirring are mixed and made into slurry by 0.4-0.8 ratio；After slurry cast is in mold frame, mold frame is placed in heat-preserving equipment, its ambient temperature is adjusted to 35-45 DEG C, and is kept for 2-5 hours, plaster mold is made in curing molding.By controlling temperature, the formation of slurry internal void is influenced, makes the gypsum mold internal capillary size reduction of preparation to 0.1 ~ 0.3 μm, so that nanoscale raw material powder is not easily accessible the micropore in mold, to complete the separation of solid and liquid of slurry and form.
Description
Technical field
The present invention relates to a kind of pressure gypsum mold, specifically a kind of nanometer scale ceramics powder pressure
The preparation method of injection forming high strength gypsum mould.
Background technique
Pressure method is a kind of using combined type casting machinery, uses resin, glass, quartz, composite material
Ceramic slurry is pressed into micropore mold by equal micropore molds using compressed air as pressure medium, is realized and is separated by solid-liquid separation and forms
Blank forming method.This method is since the nineties in last century, due to the development of mold materials technology of preparing, grouting pressure by
Step improves, pressurizing and dehydrating speed is accelerated, while the degree of automation is also improved.The characteristics of technology is：Whole preparation process
High degree of automation, the green body specification of preparation is big, density is high, intensity is high, can near-net-shape.Current existing slip casing by pressure
Forming technique, mold use micro-porous resin material more（Use metal or marble as outline border）, the slurry for injection forming is former
Material generally uses micro-ceramic powder, after powder and micron slurry is made, is realized by air inlet pipe pre-buried in mold and inlet pipe
Forming operation is applied to sanitary ware, household china more in terms of engineering（Such as square plate, disk）Etc. the relatively simple pottery of shapes
The molding of porcelain billet body.
Generally at 1 μm or more, slurry made from such micro-ceramic powder is pressurizeing the pore-size of micro-porous resin mold
When slip casting, powder particle will not enter in the micropore of mold and block, so that slurry is smoothly realized separation of solid and liquid and formed.
But when the raw material powders such as nanoscale, high sintering activity, technical ceramics with high added value use micro-porous resin mold, because
Its average particle size particle size is usually in 100nm hereinafter, carry out grouting under pressure, this fine powder in the preferable situation of slurry dispersibility
Grain easily enters in the micropore of mold, causes the blocking of micropore, and the particle in micro channel is blocked in pressure process
Meeting dehydrating and curing, be discharged the most of moisture in slurry can not, leads to difficult forming.The origin cause of formation of the problem is that mold is micro-
The mismatch of pore size and raw material Powder Particle Size.
And how to produce that pore size is small, is evenly distributed, nanometer scale ceramics powder pressure injection forming can be suitable for
Mold, be current technical staff technical problem urgently to be solved.
Summary of the invention
The technical problem to be solved by the present invention is to overcome mold pore size and raw material Powder Particle Size to mismatch to lead to micropore
Easily blocking, the difficult problem of moisture discharge during pressure provide that a kind of pore size is small, is evenly distributed, can
The manufacturing method of mold suitable for nanometer scale ceramics powder pressure injection forming.
Used technical solution is the present invention to solve above-mentioned technical problem：Nanometer scale ceramics powder pressure injection forming
The auxiliary agent including anti-corrosion agent and retarder is added using land plaster as main material with the preparation method of high strength gypsum mould, it is mixed with water
It closes and is cast in after slurry is made in the mold frame of setting internal mold shape, plaster mold is made in curing molding, in the process for preparing slurry
In, the auxiliary agent being added into gypsum powder raw material further include land plaster weight 8-12% pore creating material and 3-5% reinforcing agent, according to
The weight ratio of land plaster and water is 1:Land plaster, auxiliary agent and water uniform stirring are mixed and made into slurry by 0.4-0.8 ratio；Slurry
After material is cast in mold frame, mold frame is placed in heat-preserving equipment, its ambient temperature is adjusted to 35-45 DEG C, and is kept
2-5 hours.
The land plaster is that the average grain diameter of desulfurized gypsum preparation is 10 ~ 20 μm, and doing compression strength is 40 ~ 45MPa's
α type super strong gypsum powder.
The pore creating material is polymethyl methacrylate, starch, ammonium hydrogen carbonate, urea or polyethylene glycol.
The reinforcing agent is sodium carboxymethylcellulose, organic siliconresin or modified cotton fiber.
The anti-corrosion agent is the pulverized slag or portland cement powder that average grain diameter is 30 ~ 45 μm, and additional amount is gypsum
0.5-the 2% of powder weight.
The additional amount of the retarder is 0.5-the 2% of land plaster weight.
After land plaster, auxiliary agent and water mixing, slurry is made in 5-10 minutes in stirring.
The beneficial effects of the invention are as follows：In gypsum powder raw material in proportion be added with pore creating material and reinforcing agent, in proportion with
After water is mixed and made into slurry and is poured, by controlling temperature, 2-5 hours are kept the temperature in 35-45 DEG C, to influence slurry internal void
Formation, make preparation gypsum mold internal capillary size reduction to 0.1 ~ 0.3 μm, so that nanoscale raw material powder is not easily accessible mould
Micropore in tool, to complete the separation of solid and liquid of slurry and form.And the flexural strength of mold can reach 5.0MPa.
High strength gypsum mould prepared by the present invention, the pressure suitable for nanometer scale ceramics powder.It is infused in pressure
During slurry, plaster mold intensity with higher and faster drain age velocity, although its service life will be lower than resin mold
Tool, but because at low cost and be conveniently replaceable, there is the molding of the technical ceramics product of high added value especially suitable for nanoscale.
Specific embodiment
Clear, complete explanation is carried out to technical solution of the present invention below in conjunction with specific embodiment.Described enumerate is real
Applying example is only a part of the invention, rather than whole embodiments.
Nanometer scale ceramics powder pressure injection forming high strength gypsum mould of the present invention, using the side of moulding by casting
Method is added the auxiliary agents such as anti-corrosion agent, retarder, is cast in setting after being mixed and made into slurry with water using land plaster as main material
In the mold frame of mould shape, plaster mold is made in curing molding.
The present invention during preparing slurry, the auxiliary agent that is added into gypsum powder raw material except anti-corrosion agent, retarder it
It outside, further include pore creating material and reinforcing agent.Wherein, land plaster is the α type super strong gypsum powder of desulfurized gypsum preparation, average grain diameter
It is 10 ~ 20 μm, doing compression strength is 40 ~ 45MPa.Pore creating material be polymethyl methacrylate, starch, ammonium hydrogen carbonate, urea or
Polyethylene glycol, additional amount are 8-the 12% of land plaster weight, and reinforcing agent is sodium carboxymethylcellulose, organic siliconresin or modified cotton
Flower fiber, additional amount are 3-the 5% of land plaster weight.Anti- corrosion agent be pulverized slag or portland cement powder, average grain diameter be 30 ~
45μm.Retarder is gypsum special retarder.The additional amount of anti-corrosion agent and retarder is 0.5-the 2% of land plaster weight.
Gypsum powder raw material is mixed with auxiliary agent, and according to plaster-water ratio（Land plaster：Water, weight ratio）It is 1:0.4 ~ 0.8 ratio
Slurry is made in 5-10 minutes in example plus water mixing, stirring.By the slurry cast of preparation in being embedded with air inlet pipe, inlet pipe, drainpipe
In the mold frame of equal devices, then mold frame is placed in heat-preserving equipment, its ambient temperature is adjusted to 35-45 DEG C, and is kept
2-5 hours.In insulating process, the micropore being evenly distributed can be formed in slurry, gypsum slurry also while gradually solidifies, completely solid
Gypsum mold is made in demoulding after change, and internal capillary size is in 0.1 ~ 0.3 μ m.Although slip casing by pressure raw material powder at this time
The primary particle size at end（< 100nm）Still less than mold micropore, but the particle in slip casing by pressure slurry after dispersion is because of surface energy
It is very big, often exist in the form of larger-size soft aggregate, therefore is not easily accessible in mold micropore or only a fraction thin
Grain enters and blocking microporous, but because the micropore in mold is connection, therefore does not influence molding completion.
Embodiment 1：
A kind of preparation method of the high strength gypsum mould suitable for nanometer scale ceramics powder pressure injection forming, is matched in following ratio
Material：In the α type super strong gypsum powder that every 100 parts of average grain diameters are 10 μm, dry compression strength is 40MPa, 8 parts of poly- methyl-props are mixed
Pulverized slag, the 0.5 part of gypsum special retarder of e pioic acid methyl ester, 3 parts of sodium carboxymethylcelluloses, 0.5 part of average grain diameter for 30 μm.It will
Above-mentioned material is 1 according to plaster-water ratio:0.4 mechanical mixture 5 minutes, then be cast in the mold frame of set internal mold shape, in 35
DEG C heat preservation 5h, the pore size obtained suitable for nanometer scale ceramics powder pressure injection forming are strong in 0.1 ~ 0.3 μ m, anti-folding
Degree is the high strength gypsum mould of 4.5MPa.
Embodiment 2：
A kind of preparation method of the high strength gypsum mould suitable for nanometer scale ceramics powder pressure injection forming, is matched in following ratio
Material：In the α type super strong gypsum powder that every 100 parts of average grain diameters are 20 μm, dry compression strength is 45MPa, 12 parts of starch, 5 are mixed
The modified cotton fiber of part, portland cement powder, 2 part gypsum special retarders of 2 parts of average grain diameters for 45 μm.Above-mentioned material is pressed
It is 1 according to plaster-water ratio:0.8 mechanical mixture 10 minutes, then be cast in the mold frame of set internal mold shape, in 45 DEG C of heat preservation 2h,
Obtain the pore size suitable for nanometer scale ceramics powder pressure injection forming is in 0.1 ~ 0.3 μ m, flexural strength
The high strength gypsum mould of 5.0MPa.
Embodiment 3：
A kind of preparation method of the high strength gypsum mould suitable for nanometer scale ceramics powder pressure injection forming, is matched in following ratio
Material：In the α type super strong gypsum powder that every 100 parts of average grain diameters are 18 μm, dry compression strength is 40MPa, 10 parts of bicarbonates are mixed
Pulverized slag, the 1 part of gypsum special retarder of ammonium, 4 parts of modified cotton fibers, 1 part of average grain diameter for 40 μm.By above-mentioned material according to
Plaster-water ratio is 1:0.6 mechanical mixture 8 minutes, then be cast in the mold frame of set internal mold shape, in 40 DEG C of heat preservation 3h, obtain
Pore size suitable for nanometer scale ceramics powder pressure injection formings is 4.8MPa in 0.1 ~ 0.3 μ m, flexural strength
High strength gypsum mould.
Claims (7)
1. the nanometer scale ceramics powder pressure injection forming preparation method of high strength gypsum mould is added using land plaster as main material
Auxiliary agent including anti-corrosion agent and retarder is mixed in the mold frame for being cast in setting internal mold shape after slurry with water, Gu
Plaster mold is made in chemical conversion type, it is characterised in that：During preparing slurry, the auxiliary agent being added into gypsum powder raw material further includes
The pore creating material of land plaster weight 8-12% and 3-5% reinforcing agent, according to the weight ratio of land plaster and water be 1:0.4-0.8
Land plaster, auxiliary agent and water uniform stirring are mixed and made into slurry by ratio；After slurry cast is in mold frame, mold frame is placed in guarantor
In warm equipment, its ambient temperature is adjusted to 35-45 DEG C, and is kept for 2-5 hours.
2. the preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould as described in claim 1, special
Sign is：The land plaster is that the average grain diameter of desulfurized gypsum preparation is 10 ~ 20 μm, does the α that compression strength is 40 ~ 45MPa
Type super strong gypsum powder.
3. the preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould as described in claim 1, special
Sign is：The pore creating material is polymethyl methacrylate, starch, ammonium hydrogen carbonate, urea or polyethylene glycol.
4. the preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould as described in claim 1, special
Sign is：The reinforcing agent is sodium carboxymethylcellulose, organic siliconresin or modified cotton fiber.
5. the preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould as described in claim 1, special
Sign is：The anti-corrosion agent is the pulverized slag or portland cement powder that average grain diameter is 30 ~ 45 μm, and additional amount is land plaster
0.5-the 2% of weight.
6. the preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould as described in claim 1, special
Sign is：The additional amount of the retarder is 0.5-the 2% of land plaster weight.
7. the preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould as described in claim 1, special
Sign is：After land plaster, auxiliary agent and water mixing, slurry is made in 5-10 minutes in stirring.
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Cited By (3)
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|---|---|---|---|---|
| CN110845231A (en) * | 2019-10-31 | 2020-02-28 | 中国船舶重工集团公司第七二五研究所 | Method for preparing ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting |
| CN110843085A (en) * | 2019-11-29 | 2020-02-28 | 航天特种材料及工艺技术研究所 | Method for manufacturing gypsum mold and method for manufacturing fused quartz ceramic radome by using gypsum mold |
| CN113443886A (en) * | 2021-07-20 | 2021-09-28 | 江苏一夫科技股份有限公司 | Preparation method of corrosion-resistant ceramic gypsum mold |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845231A (en) * | 2019-10-31 | 2020-02-28 | 中国船舶重工集团公司第七二五研究所 | Method for preparing ceramic cylinder sleeve for petroleum drilling by high-pressure slip casting |
| CN110843085A (en) * | 2019-11-29 | 2020-02-28 | 航天特种材料及工艺技术研究所 | Method for manufacturing gypsum mold and method for manufacturing fused quartz ceramic radome by using gypsum mold |
| CN113443886A (en) * | 2021-07-20 | 2021-09-28 | 江苏一夫科技股份有限公司 | Preparation method of corrosion-resistant ceramic gypsum mold |
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