CN103360012B - Plaster mould for ceramic slip casting and manufacturing method of plaster mould - Google Patents
Plaster mould for ceramic slip casting and manufacturing method of plaster mould Download PDFInfo
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- CN103360012B CN103360012B CN201210083726.7A CN201210083726A CN103360012B CN 103360012 B CN103360012 B CN 103360012B CN 201210083726 A CN201210083726 A CN 201210083726A CN 103360012 B CN103360012 B CN 103360012B
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Abstract
The invention provides a plaster mould for ceramic slip casting and a manufacturing method of the plaster mould. The plaster mould comprises the following materials: porous asphalt carbon and plaster slurry, wherein the plaster slurry is formed by dissolving plaster powder in water; the weight percentage of the porous asphalt carbon to the plaster powder is 1:(0.8-3). The invention further provides a manufacturing method of the plaster mould. The 2h-wet breaking strength, the 2h-wet comprehensive strength and the water absorption of the plaster mould obtained by the manufacturing method disclosed by the invention are obviously improved. Meanwhile, the plaster mould manufactured by the manufacturing method disclosed by the invention is excellent in corrosion resistance and abrasion resistance.
Description
Technical field
The present invention relates to a kind of gypsum mold shaping for ceramic grout and preparation method thereof.
Background technology
Injection forming is a kind of ceramic molding of simple, usually using gypsum as shaping mould.The cost of manufacture of gypsum is cheap, and its raw gypsum is at China's rich reserves, cheap; Good fluidity aborning, can prepare the mould of different shape; It has unrivaled coagulability energy, water absorbing properties in addition, and be still widely used at present in the forming technologies such as slip casting, spinning, roll extrusion, plastic compression (colding pressing), there is no other materials can be completely alternative.
Traditional technology prepares gypsum mold, is to adopt the mixed powder of a certain proportion of alpha gypsum powder and β terra alba and water to be modulated into gypsum slurry, through cast molding, drying and making.The intensity of alpha gypsum powder is high, but its water-retaining capacity is poor; The water-retaining capacity of β terra alba is strong, but intensity difference.If the alpha gypsum powder amount of allocating in raising gypsum slurry, gypsum mold possesses certain intensity, but its water-retaining capacity is deteriorated; If the β terra alba amount of allocating in raising gypsum slurry, gypsum mold has excellent water absorbing properties, but its intensity is too low.In a word, single is raw material with terra alba, be difficult to prepare not only there is high strength but also have excellent absorbency can gypsum mold.
Gypsum mold is used in ceramic industry, high intensity should be had scrap to avoid mould to damage in operation and handling process, excellent water absorbing properties (water-intake rate and rate of water absorption) should be had to ensure ceramic green quality and production efficiency simultaneously, in addition, also require that gypsum mold has good corrosion resistance nature and wear resisting property.Therefore, preparation high strength, excellent absorbency energy, there is the gypsum mold of certain corrosion resistance nature and wear resisting property, become ceramic product and produced the problem needing solution in low cost, high quality, high-level efficiency future development badly.In order to solve the problem, have document in gypsum mold, to add toughener to promote its physical strength and wear resistance, but toughener add the decline that membership causes mould water absorbing properties, thus the service requirements of mould to water-intake rate and absorption speed cannot be reached.
Summary of the invention
The present invention is the technical problem that intensity is low, water absorbing properties is poor solving existing gypsum mold, provides gypsum mold that a kind of intensity is high, water-retaining capacity is strong and preparation method thereof.
The invention provides a kind of gypsum mold shaping for ceramic grout, this gypsum mold comprises following raw material: porous asphalt charcoal: gypsum slurry; Described gypsum slurry is the water-soluble formation of terra alba; The weight percent of wherein said porous asphalt charcoal and terra alba is: 1:0.8-3.
Present invention also offers a kind of preparation method of gypsum mold, the method comprises the following steps:
S1 is raw material with pitch, adds whipping agent and mixes, and foaming under nitrogen atmosphere protection, prepares porous asphalt charcoal;
Terra alba and water are modulated into calcium plaster by S2, namely obtain gypsum mold after calcium plaster mixes with asphalt carbon after stirring, cast molding, drying.
The present invention adopts pitch to be raw material, and after foaming, prepare porous asphalt charcoal, the porous asphalt charcoal obtained has the advantages that intensity is high, erosion resistance is strong.Adopt this asphalt carbon to be skeleton, join in gypsum slurry and prepare gypsum mold, intensity and the water absorbing properties of gypsum mold can be improved, improve corrosion resistance nature and the wear resisting property of gypsum mold.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of gypsum mold shaping for ceramic grout, this gypsum mold comprises following raw material: porous asphalt charcoal: gypsum slurry; Described gypsum slurry is the water-soluble formation of terra alba; The weight percent of wherein said porous asphalt charcoal and terra alba is: 1:0.8-3.
According to gypsum mold provided by the present invention, in order to the intensity and water-absorbent making gypsum mold is better, preferably, the porosity of described porous asphalt charcoal is 55-85%.
According to gypsum mold provided by the present invention, in order to better improve erosion resistance and the wear resistance of gypsum mold, preferably, the median size of described porous asphalt charcoal is 1-10mm.More preferably 3-8mm.
According to gypsum mold provided by the present invention, preferably, the present invention adopts coal-tar pitch that is cheap, wide material sources to be raw material, in order to make the porous asphalt charcoal of preparation have higher intensity, and preferred coal tar pitch further.
According to gypsum mold provided by the present invention, preferably, described terra alba comprises alpha gypsum powder and β terra alba.Described with the gross weight of described terra alba for benchmark, the content of described alpha gypsum powder is 60-100wt%, and the content of described β terra alba is 0-40wt%.
According to gypsum mold provided by the present invention, preferably, the mean particle size of described terra alba is 90-150 order.CaSO in the terra alba adopted
42H
2the content of O is greater than 95%.
Present invention also offers a kind of preparation method of gypsum mold, the method comprises the following steps:
S1 is raw material with pitch, adds whipping agent and mixes, and foaming under nitrogen atmosphere protection, prepares porous asphalt charcoal;
Terra alba and water are modulated into calcium plaster by S2, namely obtain gypsum mold after calcium plaster mixes with asphalt carbon after stirring, cast molding, drying.
According to the preparation method of gypsum mold provided by the present invention, preferably, described blowing temperature is 350-600 DEG C, and pressure is 2-5MPa, and temperature rise rate is 5-15 DEG C/min, is incubated 2-5h under top temperature.
According to the preparation method of gypsum mold provided by the present invention, preferably, described whipping agent is inorganic foaming agent and/or organic blowing agent.More preferably, described inorganic foaming agent is at least one in sodium bicarbonate, volatile salt, bicarbonate of ammonia; Described organic blowing agent is at least one in aliphatic amide, butane, pentane, hexane.Leaving space while whipping agent volatilizees at a certain temperature gradually, makes pitch form foamy structure, obtains rigid structure porous asphalt charcoal after follow-up pyroprocessing.
According to the preparation method of gypsum mold provided by the present invention, preferably, with the gross weight of pitch for benchmark, the content of described whipping agent is 0.5-5wt%.
According to the preparation method of gypsum mold provided by the present invention, preferably, in described calcium plaster, the mass ratio of terra alba and water is 1.0-1.5: 1.
According to the preparation method of gypsum mold provided by the present invention, in order to effectively remove the bubble in calcium plaster, improve intensity and the wear resistance of mould, preferably, described calcium plaster is stir to obtain under vacuum tightness is the condition of-0.1-0.01MPa with mixing of porous asphalt charcoal.
According to the preparation method of gypsum mold provided by the present invention, in order to improve the intensity of gypsum mold, preferably, described casting is after being mixed with porous asphalt charcoal by calcium plaster, is that 0-0.02MPa carries out cast molding in vacuum tightness.
According to the preparation method of gypsum mold provided by the present invention, preferably, described drying be by the demoulding after gypsum mold at 45-65 DEG C of temperature, be dried to constant weight.
Below by specific embodiment, the present invention is further detailed.
Embodiment 1
1, the preparation of porous asphalt charcoal: with coal tar pitch (softening temperature 95 DEG C) for raw material, volatile salt is whipping agent, the two is to mix at 100: 1 in mass ratio.The compound obtained carries out foaming and prepares porous asphalt charcoal in autoclave, and foam process is: temperature rise rate 10 DEG C/min, pressure 3MPa, and foaming top temperature 500 DEG C is also incubated 4h.The asphalt carbon obtained is broken for the particle that particle diameter is 3-8mm.
2, the preparation of calcium plaster: be greater than 95% with purity, granularity is 90-150 object terra alba (wherein alpha gypsum powder: β terra alba=80: be stir under the condition of 0.0008MPa to prepare calcium plaster in vacuum tightness after 20) mixing with water, wherein, the mass ratio of terra alba and water is 1.2: 1.
3, the preparation of gypsum mold: get porous asphalt charcoal and calcium plaster prepared by aforesaid method, allocate 35 parts of asphalt carbon particles in every 100 parts of calcium plasters.Both are cast molding under the condition of 0.02Mpa in vacuum tightness after mixing under vacuum tightness is the condition of 0.01MPa.
Mould after shaping is dried to constant weight at 60 DEG C of temperature, obtains gypsum mold A1.
Embodiment 2
The method identical with embodiment 1 is adopted to prepare gypsum mold, unlike, whipping agent is replaced by aliphatic amide (addition is 1.5wt%); Foam process is: temperature rise rate 15 DEG C/min, pressure 2MPa, and foaming top temperature 600 DEG C is also incubated 2h; In calcium plaster, the mass ratio of terra alba and water is 1: 1; Prepare gypsum mold A2.
Embodiment 3
The method identical with embodiment 1 is adopted to prepare gypsum mold, unlike, whipping agent is replaced by butane (addition is 0.5wt%) foam process and is: temperature rise rate 5 DEG C/min, pressure 5MPa, foaming top temperature 350 DEG C is also incubated in 6h calcium plaster, and the mass ratio of terra alba and water is 1.5: 1; Terra alba consists of: alpha gypsum powder: β terra alba=100: 0, prepares gypsum mold A3.
Embodiment 4
The method identical with embodiment 1 is adopted to prepare gypsum mold, unlike, whipping agent is replaced by hexane (addition is 3.5wt%); Consisting of of terra alba: alpha gypsum powder: β terra alba=60: 40, prepares gypsum mold A4.
Embodiment 5
The method identical with embodiment 1 is adopted to prepare gypsum mold, unlike, whipping agent is replaced by volatile salt (addition is 5wt%), and when preparing gypsum mold, every 100 parts of calcium plasters allocate 25 parts of asphalt carbon particles into, prepare gypsum mold A5.
Embodiment 6
The method identical with embodiment 1 is adopted to prepare gypsum mold, unlike, whipping agent is replaced by bicarbonate of ammonia (addition is 2.5wt%), and when preparing gypsum mold, every 100 parts of calcium plasters allocate 50 parts of asphalt carbon particles into, prepare gypsum mold A6.
Comparative example 1
Purity is adopted to be greater than 95%, granularity is 100-200 object terra alba (wherein alpha gypsum powder: β terra alba=70: 30) be raw material, be stir under the condition of 0.0008MPa to prepare calcium plaster in vacuum tightness after mixing with water, wherein, the mass ratio of terra alba and water is 1.2: 1.
The calcium plaster prepared cast molding under vacuum tightness is the condition of 0.01MPa, obtains after shaping being that gypsum mold is dried to constant weight at 45 ~ 65 DEG C of temperature, obtains gypsum mold B1.
Performance Detection
1, wet folding strength, wet compressive strength
Adopt QBT 1640-1992 ceramic die terra alba quantitative measurement method to carry out wet folding strength, 2h wet compressive strength of 2h to above obtained respectively gypsum mold A1, A2, A3, A4, A5, A6, B1 to detect.The results are shown in Table 1.
2, water-intake rate
Water-intake rate adopts the conventional testing method of industry to test, and testing method is as follows: sample dries to constant weight (g at 40 ± 5 DEG C
0), then steep again to constant weight (g in water
1), then press the calculation formula [(g of water-intake rate
1-g
0)/g
0× 100%] water-intake rate of this sample is obtained.The results are shown in Table 1.
Table 1
| Sample number into spectrum | A1 | A2 | A3 | A4 | A5 | A6 | B1 |
| 2h wets folding strength/MPa | 7.23 | 7.11 | 8.02 | 6.86 | 6.92 | 7.64 | 4.08 |
| 2h wet compressive strength/MPa | 15.63 | 15.35 | 15.85 | 14.33 | 14.46 | 16.43 | 8.37 |
| Water-intake rate (%) | 65.25 | 63.43 | 58.68 | 70.38 | 63.11 | 67.24 | 46.45 |
The test result of above-mentioned table 1 can be found out, wet folding strength, 2h wet compressive strength, water-intake rate of the 2h of the gypsum mold prepared by the present invention is significantly improved.Meanwhile, gypsum mold prepared by the present invention has excellent corrosion-resistant, wear resisting property, for injection forming, can greatly increase mold use life-span and quality product.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. for the gypsum mold that ceramic grout is shaping, it is characterized in that, this gypsum mold comprises following raw material: porous asphalt charcoal: gypsum slurry; Described gypsum slurry is the water-soluble formation of terra alba; The weight percent of wherein said porous asphalt charcoal and terra alba is: 1:0.8-3;
Described porous asphalt charcoal is raw material with pitch, adds whipping agent and mix, and issue bubble in nitrogen atmosphere protection and prepare, described blowing temperature is 350-600 DEG C, and pressure is 2-5MPa, and temperature rise rate is 5-15 DEG C/min, is incubated 2-5h under top temperature.
2. gypsum mold according to claim 1, is characterized in that, the porosity of described porous asphalt charcoal is 55-85%.
3. gypsum mold according to claim 1, is characterized in that, the median size of described porous asphalt charcoal is 1-10mm.
4. gypsum mold according to claim 1, is characterized in that, described asphalt carbon is coal-tar pitch charcoal.
5. gypsum mold according to claim 1, is characterized in that, described terra alba comprises alpha gypsum powder and β terra alba; With the gross weight of described terra alba for benchmark, the content of described alpha gypsum powder is 60-100wt%, and the content of described β terra alba is 0-40wt%.
6. gypsum mold according to claim 1, is characterized in that, the mean particle size of described terra alba is 90-150 order.
7. a preparation method for gypsum mold according to claim 1, is characterized in that, the method comprises the following steps:
S1 is raw material with pitch, adds whipping agent and mixes, and foaming under nitrogen atmosphere protection, prepares porous asphalt charcoal;
Terra alba and water are modulated into calcium plaster by S2, namely obtain gypsum mold after calcium plaster mixes with asphalt carbon after stirring, cast molding, drying.
8. the preparation method of gypsum mold according to claim 7, is characterized in that, described whipping agent is inorganic foaming agent and/or organic blowing agent.
9. the preparation method of gypsum mold according to claim 8, is characterized in that, described inorganic foaming agent is at least one in sodium bicarbonate, volatile salt, bicarbonate of ammonia; Described organic blowing agent is at least one in aliphatic amide, butane, pentane, hexane.
10. the preparation method of gypsum mold according to claim 7, is characterized in that, with the gross weight of pitch for benchmark, the content of described whipping agent is 0.5-5wt%.
The preparation method of 11. gypsum molds according to claim 7, is characterized in that, in described calcium plaster, the mass ratio of terra alba and water is 1.0-1.5: 1.
The preparation method of 12. gypsum molds according to claim 7, is characterized in that, described calcium plaster is stir to obtain under vacuum tightness is the condition of-0.1-0.01MPa with mixing of porous asphalt charcoal.
The preparation method of 13. gypsum molds according to claim 7, is characterized in that, described casting is after being mixed with porous asphalt charcoal by calcium plaster, is that 0-0.02MPa carries out cast molding in vacuum tightness.
The preparation method of 14. gypsum molds according to claim 7, is characterized in that, described drying be by the demoulding after gypsum mold at 45-65 DEG C of temperature, be dried to constant weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210083726.7A CN103360012B (en) | 2012-03-27 | 2012-03-27 | Plaster mould for ceramic slip casting and manufacturing method of plaster mould |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210083726.7A CN103360012B (en) | 2012-03-27 | 2012-03-27 | Plaster mould for ceramic slip casting and manufacturing method of plaster mould |
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| CN103360012A CN103360012A (en) | 2013-10-23 |
| CN103360012B true CN103360012B (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105347768B (en) * | 2015-11-03 | 2018-03-23 | 北京建筑材料科学研究总院有限公司 | Slip casing by pressure mould land plaster |
| CN108911664A (en) * | 2018-07-11 | 2018-11-30 | 中国船舶重工集团公司第七二五研究所 | The preparation method of nanometer scale ceramics powder pressure injection forming high strength gypsum mould |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020605A (en) * | 2007-03-08 | 2007-08-22 | 淄博泰山瓷业有限公司 | Ceramic mold |
| CN101204830A (en) * | 2007-12-18 | 2008-06-25 | 中国科学院上海硅酸盐研究所 | Plaster mould for ceramic grout fashioned improved and producing method with same |
| CN102363576A (en) * | 2011-06-14 | 2012-02-29 | 昆山市瑞捷精密模具有限公司 | Carboxymethyl cellulose-enhanced mould plaster and forming method of plaster mould |
-
2012
- 2012-03-27 CN CN201210083726.7A patent/CN103360012B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020605A (en) * | 2007-03-08 | 2007-08-22 | 淄博泰山瓷业有限公司 | Ceramic mold |
| CN101204830A (en) * | 2007-12-18 | 2008-06-25 | 中国科学院上海硅酸盐研究所 | Plaster mould for ceramic grout fashioned improved and producing method with same |
| CN102363576A (en) * | 2011-06-14 | 2012-02-29 | 昆山市瑞捷精密模具有限公司 | Carboxymethyl cellulose-enhanced mould plaster and forming method of plaster mould |
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