CN108059376A - A kind of preparation method of dental models gypsum - Google Patents
A kind of preparation method of dental models gypsum Download PDFInfo
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- CN108059376A CN108059376A CN201711484360.3A CN201711484360A CN108059376A CN 108059376 A CN108059376 A CN 108059376A CN 201711484360 A CN201711484360 A CN 201711484360A CN 108059376 A CN108059376 A CN 108059376A
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- gypsum
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/34—Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4]
-
- 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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00836—Uses not provided for elsewhere in C04B2111/00 for medical or dental applications
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dental Preparations (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention provides a kind of preparation methods of dental models gypsum, the high whiteness alpha semi-hydrated gypsum powder of high-purity that liquid phase method is obtained is with 100 parts, 15 20 parts of reinforcing agent, 10 12 parts of toughener, 8 10 parts of antiwear additive, 68 parts of water-reducing agent, 35 parts of antifoaming agent mixes Cheng Mo after stirring, wherein, the reinforcing agent is cyanoacrylate, and the toughener is acrylic resin and fiber, and the antiwear additive is butadiene and the copolymer of acrylonitrile, the water-reducing agent is naphthalene series high-efficiency water-reducing agent and melamine, and the antifoaming agent is D 30X high effective antifoaming agents.A kind of preparation method of dental models gypsum provided by the invention, using new formula and dosage, the defects of improving original dental gypsum intensity and small hardness, while final gypsum product toughness and wear resistance are improved.
Description
Technical field
The present invention relates to a kind of gypsum more particularly to a kind of preparation methods of dental models gypsum.
Background technology
Dental plaster is that dentist diagnoses essential reconstructed model material in clinical manipulation and therapeutic process, can make dentist
It diagnosed, treated outside patient oral cavity, be a kind of important medical material.Medical dental plaster is to the hardness of gypsum, close
The performances such as degree and intensity have higher requirement, and existing dental plaster performance is difficult to reach requirement at present.
A kind of dentistry is disclosed in a kind of patent of invention " High-strength gypsum for dentistry " of application number 201210000045.X
With gypsum, ingredient is 100 parts of alpha-semi water plaster stone powder；3~10 parts of reinforcing agent；2~7 parts of water-reducing agent；0~5 part of cement is uniformly mixed
Conjunction is made.The invention improves the solidifiability of gypsum by the way of additive is added in common alpha-semi water plaster stone, carries
The high density of gypsum, intensity and hardness.But the gypsum still has performance deficiency, and final gypsum product gypsum intensity and hardness are still
It is not big enough, and final gypsum product toughness and wear resistance etc. can not all be met the requirements.
The content of the invention
It is an object of the invention to overcome the defect of the prior art, a kind of preparation method of dental models gypsum is provided,
Using new formula and dosage, the defects of improving original dental gypsum intensity and small hardness, while final gypsum product toughness
It is improved with wear resistance.
What the present invention was realized in：
The present invention provides a kind of preparation method of dental models gypsum, includes the following steps：
Step 1, purification process：Ardealite is configured to the slurries that solid holdup is 5%~60%, sieve filters bulk impurity
And suspended matter, it adds in dilute sulfuric acid (1~12M) and carries out neutralization reaction, remove a small amount of insoluble oxide, calcium carbonate, magnesium carbonate
Wait impurity, it made to be converted into soluble-salt, while filter organic carbon, add in after quick lime is neutralized, crushing grinding into
The land plaster of fineness and distribution of particles D50 between 20-50um；
Step 2 turns brilliant reaction：The land plaster is placed in mud blender, by solid-to-liquid ratio 1：8 ratio adds in sulfur-bearing
It in acid and phosphoric acid mixing acid aqueous solution, is uniformly mixed, mixed slurry is made, wherein, it is water-soluble that the quality of sulfuric acid accounts for nitration mixture in terms of H2SO4
The 8~10% of liquid gross mass, the quality of phosphoric acid account for the 18~20% of nitration mixture aqueous solution gross mass in terms of P2O5, add 0.1~
5% crystal modifier, the crystal modifier include sodium citrate, glutaric acid potassium, succinic acid magnesium and inorganic salts mixture, add quality afterwards
The sodium acetate that percentage is 1%~6% forms supersaturated solution system, 80~120 DEG C of slurries is kept to be turned as additive
Crystalline substance reaction, 4~16h of conversion reaction time；
Step 3, crystallographic orientation：0.1% chemical additives are added in into the mixed slurry, are stirred evenly, are oriented
Crystallization, 1~4h of crystallographic orientation obtain the mixed liquor containing alpha semi-hydrated gypsum, and the chemical additives include fumaric acid, fat
Acid and surfactant；
Step 4, liquid phase method separation：By the mixed liquor separation of solid and liquid containing alpha semi-hydrated gypsum made from the step 3, obtain
Solid phase A and liquid phase B, liquid phase B are recycled；
Step 5, washing separation：Solid phase A and liquid phase the B mixing that the step 4 is obtained carry out Xun Huan and turn brilliant reaction, solid phase
After A is washed with 80~100 DEG C of hot water, solid phase C and liquid phase D are obtained；Liquid phase D provides sulfuric acid solution for diluting concentrated sulfuric acid, Gu
Phase C dryings obtain pure alpha semi-hydrated gypsum crystal.
Step 6, dry grinding：By the pure alpha semi-hydrated gypsum crystal that the step 5 obtains 120~170 DEG C of conditions into
Row drying carries out grinding to get to the high whiteness alpha semi-hydrated gypsum powder of high-purity after drying according to application fineness.
Step 7 prepares dental models gypsum raw material：Reinforcing agent, toughener, antiwear additive, water-reducing agent, antifoaming agent and described
Alpha semi-hydrated gypsum powder obtained by step 11, the dental models gypsum raw material and parts by weight are respectively：Alpha semi-hydrated gypsum powder
100 parts, 15-20 parts of reinforcing agent, 10-12 parts of toughener, 8-10 parts of antiwear additive, 6-8 parts of water-reducing agent, 3-5 parts of antifoaming agent, wherein,
The reinforcing agent is cyanoacrylate, and the toughener is acrylic resin and fiber, and the antiwear additive is butadiene and third
The copolymer of alkene nitrile, the water-reducing agent are naphthalene series high-efficiency water-reducing agent and melamine, and the antifoaming agent efficiently defoams for D-30X
Agent.
Step 8, stirring：Add in the water of appropriate ratio, stirring 30-40 second or by hand vacuum again after stirring 10-15 seconds by hand
Stirring 20-30 seconds；
Step 9, Cheng Mo：The finished product that vacuum stirring finishes is poured into reconstructed model in stamp, 10-15 minutes is stood and waits admittedly
It is removed after change.
The invention has the advantages that：
A kind of preparation method of dental models gypsum provided by the invention, using new formula and dosage, the dentistry mould
Type gypsum raw material and parts by weight are respectively：100 parts of alpha semi-hydrated gypsum powder, 15-20 parts of reinforcing agent, 10-12 parts of toughener resist
8-10 parts of grinding agent, 6-8 parts of water-reducing agent, 3-5 parts of antifoaming agent, the defects of improving original dental gypsum intensity and small hardness,
Final gypsum product toughness and wear resistance are improved simultaneously.
Description of the drawings
Fig. 1 is a kind of process flow chart of the preparation method of dental models gypsum provided in an embodiment of the present invention.
Specific embodiment
Embodiment 1
As shown in Figure 1, the embodiment of the present invention provides a kind of preparation method of dental models gypsum, include the following steps：
Step 1, purification process：Ardealite is configured to the slurries that solid holdup is 5%~60%, sieve filters bulk impurity
And suspended matter, it adds in dilute sulfuric acid (1~12M) and carries out neutralization reaction, remove a small amount of insoluble oxide, calcium carbonate, magnesium carbonate
Wait impurity, it made to be converted into soluble-salt, while filter organic carbon, add in after quick lime is neutralized, crushing grinding into
The land plaster of fineness and distribution of particles D50 between 20-50um；
Step 2 turns brilliant reaction：The land plaster is placed in mud blender, by solid-to-liquid ratio 1：8 ratio adds in sulfur-bearing
It in acid and phosphoric acid mixing acid aqueous solution, is uniformly mixed, mixed slurry is made, wherein, the quality of wherein sulfuric acid accounts for nitration mixture in terms of H2SO4
Mass fraction for 9.00%, the quality of phosphoric acid counts the mass fraction for accounting for nitration mixture using P2O5 as 20.00%, and the quality for adding water accounts for
The mass fraction of nitration mixture aqueous solution be 34.79%, crystal modifier is added in into mixed slurry, is stirred evenly, at a temperature of 100 DEG C into
Row turns brilliant reaction 3h, obtains the mixed liquor containing alpha semi-hydrated gypsum, and crystal modifier is sodium sulphate, sodium citrate, glutaric acid potassium, fourth two
The mixture of sour magnesium, the addition of sodium sulphate account for the 0.2% of nitration mixture aqueous solution gross mass, and the addition of sodium citrate accounts for nitration mixture water
The 0.1% of solution gross mass, the addition of glutaric acid potassium account for the 0.1% of nitration mixture aqueous solution gross mass, the addition of succinic acid magnesium
Account for the 0.1% of nitration mixture aqueous solution gross mass.
Step 3, crystallographic orientation：0.1% chemical additives are added in into the mixed slurry, are stirred evenly, are oriented
Crystallization, 1~4h of crystallographic orientation obtain the mixed liquor containing alpha semi-hydrated gypsum, the chemical additives include 40% fumaric acid,
50% aliphatic acid and 10% neopelex；
Step 4, liquid phase method separation：By the mixed liquor separation of solid and liquid containing alpha semi-hydrated gypsum made from the step 3, obtain
Solid phase A and liquid phase B, liquid phase B are recycled；
Step 5, washing separation：Solid phase A and liquid phase the B mixing that the step 4 is obtained carry out Xun Huan and turn brilliant reaction, solid phase
After A is washed with 80~100 DEG C of hot water, solid phase C and liquid phase D are obtained；Liquid phase D provides sulfuric acid solution for diluting concentrated sulfuric acid, Gu
Phase C dryings obtain pure alpha semi-hydrated gypsum crystal.
Pure alpha semi-hydrated gypsum crystal obtained carries out correlated performance measure：
Alpha semi-hydrated gypsum product meets the professional standard of JC/T2038-2010 made from embodiment 1, is shown in 200 times of optics
In hexagonal short cylinder under micro mirror, draw ratio is measured as 1~2,2h flexural strength 20MPa, does compression strength as 120MPa, 7 minutes
Initial set, final set in 15 minutes.
Step 6, dry grinding：By the pure alpha semi-hydrated gypsum crystal that the step 5 obtains 120~170 DEG C of conditions into
Row drying carries out grinding to get to the high whiteness alpha semi-hydrated gypsum powder of high-purity after drying according to application fineness.
Step 7 prepares dental models gypsum raw material：Reinforcing agent, toughener, antiwear additive, water-reducing agent, antifoaming agent and described
Alpha semi-hydrated gypsum powder obtained by step 11, the dental models gypsum raw material and parts by weight are respectively：Alpha semi-hydrated gypsum powder
100 parts, 20 parts of reinforcing agent, 12 parts of toughener, 10 parts of antiwear additive, 8 parts of water-reducing agent, 5 parts of antifoaming agent, wherein, the reinforcing agent is
Cyanoacrylate, the toughener are acrylic resin and fiber, and the antiwear additive is the copolymer of butadiene and acrylonitrile,
The water-reducing agent is naphthalene series high-efficiency water-reducing agent and melamine, and the antifoaming agent is D-30X high effective antifoaming agents.
Step 8, stirring：Add in the water of appropriate ratio, stirring 30-40 second or by hand vacuum again after stirring 10-15 seconds by hand
Stirring 20-30 seconds；
Step 9, Cheng Mo：The finished product that vacuum stirring finishes is poured into reconstructed model in stamp, 10-15 minutes is stood and waits admittedly
It is removed after change.
Embodiment 2
The embodiment of the present invention is provided in a kind of preparation method of dental models gypsum, and step 1-6 and step 8-9 are with implementing
Example 1 is, different to be：
Step 7 prepares dental models gypsum raw material：Reinforcing agent, toughener, antiwear additive, water-reducing agent, antifoaming agent and described
Alpha semi-hydrated gypsum powder obtained by step 11, the dental models gypsum raw material and parts by weight are respectively：Alpha semi-hydrated gypsum powder
100 parts, 15 parts of reinforcing agent, 10 parts of toughener, 8 parts of antiwear additive, 6 parts of water-reducing agent, 3 parts of antifoaming agent, wherein, the reinforcing agent is
Cyanoacrylate, the toughener are acrylic resin and fiber, and the antiwear additive is the copolymer of butadiene and acrylonitrile,
The water-reducing agent is naphthalene series high-efficiency water-reducing agent and melamine, and the antifoaming agent is D-30X high effective antifoaming agents.
Embodiment 3
The embodiment of the present invention is provided in a kind of preparation method of dental models gypsum, and step 1-6 and step 8-9 are with implementing
Example 1 is, different to be：
Step 7 prepares dental models gypsum raw material：Reinforcing agent, toughener, antiwear additive, water-reducing agent, antifoaming agent and described
Alpha semi-hydrated gypsum powder obtained by step 11, the dental models gypsum raw material and parts by weight are respectively：Alpha semi-hydrated gypsum powder
100 parts, 18 parts of reinforcing agent, 11 parts of toughener, 9 parts of antiwear additive, 7 parts of water-reducing agent, 4 parts of antifoaming agent, wherein, the reinforcing agent is
Cyanoacrylate, the toughener are acrylic resin and fiber, and the antiwear additive is the copolymer of butadiene and acrylonitrile,
The water-reducing agent is naphthalene series high-efficiency water-reducing agent and melamine, and the antifoaming agent is D-30X high effective antifoaming agents.
Dental models final gypsum product in above-described embodiment 1, embodiment 2, embodiment 3 is detected, and by existing tooth
Section's gypsum is tested as a comparison case, and performance is as shown in the table：
| Project | Compression strength | Flexural strength | Relative wear damage property | Expansion rate | Hardening time |
| Embodiment 1 | 62MPa | 20MPa | 1.064 | 0.1% | 10-15min |
| Embodiment 2 | 70MPa | 22MPa | 1.014 | 0.1% | 10-15min |
| Embodiment 3 | 65MPa | 20MPa | 1.004 | 0.1% | 10-15min |
| Comparative example | 20MPa | 10MPa | 0.464 | 0.2% | 15-20min |
As can be seen that the indexs phase such as the compression strength in above three embodiment, flexural strength, wear resistance, expansion rate
Have larger improvement to the prior art, it is necessary to moisture also reduce accordingly, particularly expansion rate has compared with the prior art
Very big reduction substantially reduces the expansion of gypsum in the production process, facilitates the disengaging of gypsum mold, while higher anti-folding
Intensity and compression strength also reduce the possibility of gypsum breakage.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
Claims (5)
1. a kind of preparation method of dental models gypsum, which is characterized in that include the following steps：
Step 1, purification process：Ardealite is configured to the slurries that solid holdup is 5%~60%, sieve filters bulk impurity and hangs
Float adds in dilute sulfuric acid (1~12M) and carries out neutralization reaction, and it is miscellaneous to remove a small amount of insoluble oxide, calcium carbonate, magnesium carbonate etc.
Matter makes it be converted into soluble-salt, while filters organic carbon, adds in after quick lime is neutralized, and crushing grinding is into fineness
And land plasters of the distribution of particles D50 between 20-50um；
Step 2 turns brilliant reaction：The land plaster is placed in mud blender, by solid-to-liquid ratio 1：8 ratio add in sulfur acid and
It in phosphoric acid mixing acid aqueous solution, is uniformly mixed, mixed slurry is made, wherein, it is total that the quality of sulfuric acid accounts for nitration mixture aqueous solution in terms of H2SO4
The 8~10% of quality, the quality of phosphoric acid are accounted for the 18~20% of nitration mixture aqueous solution gross mass in terms of P2O5, add 0.1~5%
Crystal modifier, the crystal modifier include sodium citrate, glutaric acid potassium, succinic acid magnesium and inorganic salts mixture, add quality percentage afterwards
Than the sodium acetate for 1%~6% as additive, supersaturated solution system is formed, 80~120 DEG C of slurries is kept to carry out turning brilliant anti-
Should, 4~16h of conversion reaction time；
Step 3, crystallographic orientation：0.1% chemical additives are added in into the mixed slurry, are stirred evenly, are oriented crystallization,
1~4h of crystallographic orientation, obtains the mixed liquor containing alpha semi-hydrated gypsum, and the chemical additives include fumaric acid, aliphatic acid and table
Face activating agent；
Step 4, liquid phase method separation：By the mixed liquor separation of solid and liquid containing alpha semi-hydrated gypsum made from the step 3, solid phase A is obtained
It is recycled with liquid phase B, liquid phase B；
Step 5, washing separation：Solid phase A and liquid phase the B mixing that the step 4 is obtained carry out Xun Huan and turn brilliant reaction, and solid phase A is used
After 80~100 DEG C of hot water washing, solid phase C and liquid phase D are obtained；Liquid phase D provides sulfuric acid solution, solid phase C for diluting concentrated sulfuric acid
Drying obtains pure alpha semi-hydrated gypsum crystal.
Step 6, dry grinding：The pure alpha semi-hydrated gypsum crystal that the step 5 is obtained is done in 120~170 DEG C of conditions
It is dry, grinding is carried out to get to the high whiteness alpha semi-hydrated gypsum powder of high-purity according to application fineness after drying.
Step 7 prepares dental models gypsum raw material：Reinforcing agent, toughener, antiwear additive, water-reducing agent, antifoaming agent and the step
The alpha semi-hydrated gypsum powder of 11 gained, the dental models gypsum raw material and parts by weight are respectively：Alpha semi-hydrated gypsum powder 100
Part, 15-20 parts of reinforcing agent, 10-12 parts of toughener, 8-10 parts of antiwear additive, 6-8 parts of water-reducing agent, 3-5 parts of antifoaming agent, wherein, it is described
Reinforcing agent is cyanoacrylate, and the toughener is acrylic resin and fiber, and the antiwear additive is butadiene and acrylonitrile
Copolymer, the water-reducing agent be naphthalene series high-efficiency water-reducing agent and melamine, the antifoaming agent be D-30X high effective antifoaming agents.
Step 8, stirring：The water of appropriate ratio is added in, stirs 30-40 seconds by hand or stirring is stirred under vacuum again after 10-15 seconds by hand
20-30 seconds；
Step 9, Cheng Mo：The finished product that vacuum stirring finishes is poured into reconstructed model in stamp, 10-15 minutes is stood and waits after cured
Removal.
2. the preparation method of dental models gypsum as described in claim 1, which is characterized in that crystal modifier used in the step 2
In, sodium citrate, which accounts for 55%, glutaric acid potassium and accounts for 30%, succinic acid magnesium, accounts for 15%.
3. the preparation method of dental models gypsum as described in claim 1, which is characterized in that the inorganic salts in the step 2
For the nitrate containing aluminium, iron, magnesium, zinc or sodium ion, chlorate, sulfate.
4. the preparation method of dental models gypsum as described in claim 1, which is characterized in that step 3 chemical additives
Surfactant include neopelex, emulsifier op-10 or glycerin monostearate.
5. the preparation method of dental models gypsum as described in claim 1, which is characterized in that the fiber in the step 7 is
One or more in glass fibre, polyester fiber or asbestos fibre.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002830A (en) * | 2019-03-26 | 2019-07-12 | 合肥卓越义齿制作有限公司 | A kind of preparation method of dental antibacterial plaster cast |
| CN113666704A (en) * | 2021-08-23 | 2021-11-19 | 深圳市青青源科技有限公司 | Method for improving powder falling of dental gypsum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101734871A (en) * | 2008-11-18 | 2010-06-16 | 北京建筑材料科学研究总院有限公司 | Method for preparing alpha semi-hydrated gypsum by utilizing desulfurized gypsum |
| CN105174760A (en) * | 2015-09-18 | 2015-12-23 | 金正大生态工程集团股份有限公司 | Method for preparing alpha semi-hydrated gypsum from dihydrate gypsum |
| CN105198343A (en) * | 2015-08-29 | 2015-12-30 | 湖北凯浩鹿宝石膏科技有限公司 | Ultrahigh hardness gypsum for dental department and preparation method thereof |
-
2017
- 2017-12-29 CN CN201711484360.3A patent/CN108059376B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101734871A (en) * | 2008-11-18 | 2010-06-16 | 北京建筑材料科学研究总院有限公司 | Method for preparing alpha semi-hydrated gypsum by utilizing desulfurized gypsum |
| CN105198343A (en) * | 2015-08-29 | 2015-12-30 | 湖北凯浩鹿宝石膏科技有限公司 | Ultrahigh hardness gypsum for dental department and preparation method thereof |
| CN105174760A (en) * | 2015-09-18 | 2015-12-23 | 金正大生态工程集团股份有限公司 | Method for preparing alpha semi-hydrated gypsum from dihydrate gypsum |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110002830A (en) * | 2019-03-26 | 2019-07-12 | 合肥卓越义齿制作有限公司 | A kind of preparation method of dental antibacterial plaster cast |
| CN113666704A (en) * | 2021-08-23 | 2021-11-19 | 深圳市青青源科技有限公司 | Method for improving powder falling of dental gypsum |
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| Publication number | Publication date |
|---|---|
| CN108059376B (en) | 2020-12-08 |
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