CN102718461B - Molding process method for preparing gypsum mold by hydrothermal method and product prepared by using method - Google Patents
Molding process method for preparing gypsum mold by hydrothermal method and product prepared by using method Download PDFInfo
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- CN102718461B CN102718461B CN 201210220731 CN201210220731A CN102718461B CN 102718461 B CN102718461 B CN 102718461B CN 201210220731 CN201210220731 CN 201210220731 CN 201210220731 A CN201210220731 A CN 201210220731A CN 102718461 B CN102718461 B CN 102718461B
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- sodium hexametaphosphate
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Abstract
The invention discloses a molding process method for preparing a gypsum mold by a hydrothermal method and a product prepared by using the method. The preparation method comprises the following steps of: dissolving sodium hexametaphosphate in water, wherein sodium hexametaphosphate accounts for 0.12% total mass of gypsum; then evenly mixing alpha and beta gypsums in a weight ratio of 7:3; then mixing the mixed gesso and water with sodium hexametaphosphate in a mass ratio of 100:70; pouring the mixture into a hydrothermal kettle and enclosing well, preserving the temperature of the hydrothermal kettle at 120 DEG C -140 DEG C for a certain period of time; then opening the hydrothermal kettle and pouring a gypsum slurry into a master die for molding, so as to obtain the gypsum mold. The molding process method has the advantages that the gypsum mold with high intensity and high water absorption ratio is prepared by adopting common gesso by the hydrothermal method; the method process is simple, is low in cost, and can be widely applied to the manufacturing of ceramic molds.
Description
Technical field
The invention belongs to ceramic (pottery) field, be specifically related to a kind of hydrothermal method and prepare the moulding technique of gypsum mold and the product that makes thereof.
Background technology
Over nearly 20 years, China ceramic industry obtains develop rapidly, and since early 1990s, output is in the first in the world always.Particularly nearest 10 years, along with large-scale industrial production, a plurality of large ceramic producing regions such as Guangdong, Fujian, Sichuan, Jiangxi appearred in China ceramic industry, and the ceramic yield of China is also with growth at a high speed in the future.And the production technique of pottery has: PLASTIC SHAPING OF HIGH, casting and press forming etc., wherein various moulding processs have all used mould, in ceramic industry at present, the ceramic die that uses has: gypsum mold, resin mold, punching block etc., wherein, starting material wide material sources easy to make due to gypsum mold, with low cost, water absorbing properties is relatively good, the die quality made is light, especially can copy to flexible and convenient many advantages such as clear arris fillet, require most importantly during gypsum mold uses that water-intake rate is high, intensity good.Therefore, no matter be plastic molding, or injection forming, no matter be domestic ceramics industry or sanitary pottery industry, mostly also continuing to use gypsum mold production.But gypsum mold also has some shortcomings of self, can not satisfy the forming requirements of modernization industry such as its intensity, recycles number of times fewer etc.For above shortcoming, at present domestic is mainly by adding certain cement or different crystal forms gypsum to mix in gypsum and adding other additive etc. to improve the performance of its mould, but similar Changing Pattern is arranged, and namely water-intake rate has improved and intensity diminishes or intensity has improved and water-intake rate has diminished.Therefore, if adopt a kind of new technology of preparing can improve simultaneously intensity and the water-intake rate of gypsum, both can improve gypsum mold work-ing life, save material, reduce production costs, can satisfy again modernization industry moulding to the requirement of gypsum mold performance, the production of ceramic industry is had important practical significance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of hydrothermal method and prepares the moulding technique of gypsum mold and the product that makes thereof.
For solving above technical problem, technical scheme of the present invention is: a kind of hydrothermal method prepares the moulding technique of gypsum mold, take Sodium hexametaphosphate 99, α gypsum, β gypsum, water as raw material, it is characterized in that comprising the following steps:
The 1st step: a certain amount of Sodium hexametaphosphate 99 is dissolved in water;
The 2nd step: with α gypsum and the 7:3 mixing by weight percentage of β gypsum;
The 3rd step: with the gypsum mixtures in upper step and the water that is added with Sodium hexametaphosphate 99 by weight percentage 100:70 mix;
The 4th step: the calcium plaster that the upper step is mixed joins in water heating kettle and react for some time at the temperature of 120-140 ℃;
The 5th step: with the calcium plaster that the reaction of upper step is completed, directly pour moulding in master mold into, obtain gypsum mold.
The consumption of described the 1st step Sodium hexametaphosphate 99 is the 2nd step α gypsum and β gypsum total mass 0.12%.
In described the 4th step, the reaction times is 1 hour.
The gypsum product principal crystalline phase that aforesaid method makes is CaSO
4(H
2O)
2, water-intake rate is 22-25%, folding strength is 8-10Mpa.
The present invention adopts the common gypsum powder as raw material, and these raw material sources are extensive, and cheap, and the gypsum mold for preparing by hydrothermal method has the characteristics of high strength, high water absorbing capacity, and this product can be widely used in all kinds of pottery manufacturings.
Description of drawings
Fig. 1 is embodiment 1-2 makes plaster mould under differing temps XRD detection curve.
Fig. 2 is that the gypsum mold section SEM of traditional moulding process preparation detects photo.
Fig. 3 is that embodiment 2 makes plaster mould section SEM detection photo under 140 ℃.
Embodiment
Embodiment 1:
At first after dissolving the Sodium hexametaphosphate 99 of gypsum total mass 0.12% in water, α and the β gypsum weight ratio by 7:3 is mixed, after mixing, terra alba mixes with the mass ratio of the water that has added Sodium hexametaphosphate 99 by 100:70 again, it is airtight good to pour in water heating kettle, make water heating kettle 120 ℃ of insulations 1 hour, then open water heating kettle gypsum slurry is poured into the master mold aftershaping, obtain gypsum mold.
Embodiment 2:
At first after dissolving the Sodium hexametaphosphate 99 of gypsum total mass 0.12% in water, α and the β gypsum weight ratio by 7:3 is mixed, after mixing, terra alba mixes with the mass ratio of the water that has added Sodium hexametaphosphate 99 by 100:70 again, it is airtight good to pour in water heating kettle, make water heating kettle 140 ℃ of insulations 1 hour, then open water heating kettle gypsum slurry is poured into the master mold aftershaping, obtain gypsum mold.
The gypsum mold of embodiment 1-2 preparation and the gypsum mold tool of traditional moulding process preparation are carried out the detection of water-intake rate and folding strength, the results are shown in following table:
The D8Advance-XRD diffractometer that adopts German Brooker company to produce, use the diffractometer method that crystalline structure and the phase of the gypsum mold of embodiment 1-2 preparation are analyzed, sample adopts CuK α radiation, 0.02 ° of scanning step, 5 °/s of sweep velocity records collection of illustrative plates and sees Fig. 1: as seen from Figure 1 through after the hydrothermal method reaction, the semi-hydrated gypsum crystallization becomes dihydrate gypsum, but its chemical formula is CaSO
4(H
2O)
2, rather than CaSO
42H
2O, after gypsum process hydrothermal method that hence one can see that was processed, its crystallization changed, and is mainly that change has occured the existence form of water molecules.And the FWHM of diffraction peak is more and more less, calculates its crystallization degree with test data through jade, finds to raise with temperature, gypsum crystal can better be towards crystal (111) length of looking unfamiliar, gypsum crystal can better weave in, and intensity constantly raises, and its crystallization degree is also higher.
The KYKY-1000B type scanning electronic microscope that adopts Scientific Instrument Factory of C.A.S to produce, gypsum mold and embodiment 2 to traditional moulding process preparation make plaster mould section SEM collection of illustrative plates under 140 ℃, can obviously find out from Fig. 2,3, larger through its crystal length-to-diameter ratio of gypsum mold after hydrothermal method processing moulding, the space is evenly distributed, contact area between crystal is larger, and this is conducive to the lifting of intensity and water-intake rate.
Claims (2)
1. a hydrothermal method prepares the moulding technique of gypsum mold, take Sodium hexametaphosphate 99, α gypsum, β gypsum, water as raw material, it is characterized in that comprising the following steps:
The 1st step: a certain amount of Sodium hexametaphosphate 99 is dissolved in water;
The 2nd step: with α gypsum and the 7:3 mixing by weight percentage of β gypsum;
The 3rd step: with the gypsum mixtures in upper step and the water that is added with Sodium hexametaphosphate 99 by weight percentage 100:70 mix;
The 4th step: the calcium plaster that the upper step is mixed joins in water heating kettle and react for some time at the temperature of 120-140 ℃;
The 5th step: with the calcium plaster that the reaction of upper step is completed, directly pour moulding in master mold into, obtain gypsum mold;
The consumption of described the 1st step Sodium hexametaphosphate 99 is the 2nd step α gypsum and β gypsum total mass 0.12%;
In described the 4th step, the reaction times is 1 hour.
2. a kind of hydrothermal method prepares the product that the moulding technique of gypsum mold makes according to claim 1, and it is characterized in that: described gypsum product principal crystalline phase is CaSO
4(H
2O)
2, water-intake rate is 22-25%, folding strength is 8-10MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210220731 CN102718461B (en) | 2012-06-29 | 2012-06-29 | Molding process method for preparing gypsum mold by hydrothermal method and product prepared by using method |
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|---|---|---|---|
| CN 201210220731 CN102718461B (en) | 2012-06-29 | 2012-06-29 | Molding process method for preparing gypsum mold by hydrothermal method and product prepared by using method |
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| CN102718461A CN102718461A (en) | 2012-10-10 |
| CN102718461B true CN102718461B (en) | 2013-06-05 |
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| CN106671249A (en) * | 2015-11-11 | 2017-05-17 | 华北理工大学 | Preparation method of acrylic acid in-situ polymerization modified plaster mould |
| CN105601222B (en) * | 2015-12-23 | 2017-10-20 | 泰山石膏股份有限公司 | A kind of preparation method of plastering |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1094700A (en) * | 1994-02-23 | 1994-11-09 | 陈同 | Produce the method for high-intensity corrosion-proof gypsum powder |
| JPH1038205A (en) * | 1996-07-23 | 1998-02-13 | Babcock Hitachi Kk | Fin structure of boiler wall pipe |
| CN1259495A (en) * | 1998-10-30 | 2000-07-12 | 柳立立 | Porcelain simulated gypsum composite product |
| CN101597079B (en) * | 2009-07-03 | 2011-08-24 | 河北邢台双华石膏制品有限公司 | Technologic method for producing plastic compression gypsum powder |
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Granted publication date: 20130605 Termination date: 20190629 |