CN102993330B - Preparation method of alginate for dental impression material - Google Patents
Preparation method of alginate for dental impression material Download PDFInfo
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- CN102993330B CN102993330B CN201210557686.5A CN201210557686A CN102993330B CN 102993330 B CN102993330 B CN 102993330B CN 201210557686 A CN201210557686 A CN 201210557686A CN 102993330 B CN102993330 B CN 102993330B
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Abstract
The invention provides a preparation method of alginate for a dental impression material. The preparation method comprises the following steps of: based on properly-selected brown seaweed as a raw material, controlling a digestion condition, diluting glue solution and filtering by the means that kieselguhr is taken as filter aid, extracting alginic acid in an acidification way, neutralizing liquid phase, drying in combination with airflow and microwave energy, and smashing. According to the preparation method, the impression material is enabled to be better in compressive strength and elasticity, and good in deformation recoverability from the raw material; after the extraction technology is controlled, the products can be enabled to meet the requirement of viscosity, the purity of products can be improved, and the performance of the impression material can be preferably improved; and after the preparation method uses the drying mode which combines the airflow and the microwave energy, the moisture in the alginate can be reduced, and the stability of products can be improved.
Description
Technical field
The invention belongs to alginate preparation method field, particularly relate to a kind of preparation method of alginate for dental impression material.
Background technology
The reaction principle of alginate impression material is: alginate react with calcium sulfate in aqueous and form calcium alginate gel, control the reaction times, form the irreversible moulage of a kind of elasticity by phosphoric acid salt.This alginate coordinate the dental impression material formed, and be a most widely used class moulage at present, conventional alginate have sodium alginate, potassium alginate.
In order to obtain accurate die, moulage must possess certain performance requriements: powder has good mobility, dispersiveness and stability; The operating time using operation to keep certain, suitable setting time; It is restorative that film forming has certain ultimate compression strength, elasticity and good deformation.
Alginate are as the main film forming binder of moulage, and its quality directly affects the performance of moulage.The moisture of alginate, the stability of viscosity influence powder, viscosity, granularity and impurities affect mobility and the complete degree of reaction in the operating time, guluronic acid and mannuronic acid-content recover than affecting gel-strength, elasticity and deformation, and the formula of certain alginate impression material and the quality of other compositions also can affect die performance.Therefore must study the index such as moisture, granularity, viscosity, purity of moulage and alginate targetedly.
Data about tooth family alginate impression material has a lot, have about sodium alginate technology of preparing, also have and to carry out recipe requirements, as patent CN10181183A high-strength tooth family alginate impression material, by the high G alginates selecting gel rigidity stronger, add one or more in xanthan gum, tragacanth gum, sodium polyacrylate, with alginates synergy, improve gel snappiness, make high-strength tooth family alginate impression material, this patent only solves the low problem of alginate impression material intensity from formula.But total quality requirement is carried out to the alginate of dental impression material, and forms have not been reported of specific preparation method.
Summary of the invention
The invention provides a kind of preparation method of alginate for dental impression material, the alginate purity utilizing the inventive method to produce is high, good stability, mobility and the delivery number of alginate impression material can be improved, solve alginate impression material syneresis, ooze profit and then the bad problem of the form-stability that causes, thus improve the accuracy of alginate impression material, obtained dental impression material has good film forming properties and stability.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A preparation method for alginate for dental impression material, it comprises the following steps:
(1) with the guluronic acid content brown alga that is 45-65% for raw material, wash with water logging, after alkali digestion, thin up, foaming, floating separation obtain clear glue solution;
(2) use flocculating aids to filter clear glue solution and obtain glue;
(3) the glue acid adding after filtering changes into Lalgine, dehydration;
(4) Lalgine after dehydration is medium with organic solvent, adds alkali lye to pH6-8;
(5) dewater, use air stream drying to combine with micro-wave energy and dry, pulverize.
Further improvement to technique scheme: in described step (1), the condition of alkali digestion is temperature 45-75 DEG C, and digestion time is 8-14h.
Further improvement to technique scheme: in described step (2), flocculating aids is diatomite, filter plant is that pressure type filters or vacuum filter.
Further improvement to technique scheme: the acid that in described step (3), acidifying is used is 5-15% sulfuric acid or hydrochloric acid.
Further improvement to technique scheme: alkali used in described step (4) is sodium hydroxide or potassium hydroxide.
Further improvement to technique scheme: the organic solvent in described step (4) is one or more in methyl alcohol, ethanol, Virahol, acetone.
Further improvement to technique scheme: use air stream drying to be 15-25% to moisture content in described step (5), re-use micro-wave energy and be dried to moisture 5-15%.
Further improvement to technique scheme: the equipment that in described step (5), air stream drying is used is the one in flash dryer, impulse air flow drier or boiling drier.
Further improvement to technique scheme: described step is crushed to 150-200 order in (5).
Compared with prior art, advantage of the present invention and positively effect are:
1, the present invention selects guluronic acid content to be the brown alga of 45-65%, ensures that moulage has better ultimate compression strength, elasticity and good deformation restorative from raw material.
2, the present invention is by controlling the extraction process of alginate, thus ensures that goods meet viscosity requirement, improves the purity of product, is conducive to the performance improving moulage.
3, the drying mode that air-flow combines with micro-wave energy is applied to dry alginate by the present invention, alginate are aqueous colloidal, in fact at the Bound moisture of Alginate molecules all with 1-2 molecule, use conventional drying mode, in drying process, alginate easily self form film, hinder the evaporation of internal moisture, the conventional drying mode of use is caused to be dried to moisture very low very difficult, need high temperature, for a long time, this destroys very serious to the viscosity of alginates and performance, the drying mode that the present invention uses air-flow to combine with micro-wave energy had both reduced the moisture in alginate, turn improve the stability of product.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
The preparation method of alginate for dental impression material of the present invention comprises the following steps:
1, select the bulk kelp (Lessonia Nigrescens) of guluronic acid content 47%, after soaking washing, add soda ash and digest 10h at 70 DEG C, then thin up filters, and foaming, floating separation obtain clear glue solution.
2, with diatomite be flocculating aids carry out essence filter obtain glue;
3, the glue after essence filter adds 10% sulfuric acid conversion and becomes Lalgine, and dewaters;
4, the Lalgine after dehydration, take alcohol as medium, carries out being neutralized to pH6-8 with sodium hydroxide.
5, dewater after granulation, be dried to moisture 20% with boiling type drying machine, then be dried to moisture content 11% with micro-wave energy, be crushed to 200 orders.
Gained sodiun alginate product viscosity: 270mPas, pH:6.3,1% solution transparency 43cm, moisture 11%.
Embodiment 2
The preparation method of gear division alginate impression material of the present invention comprises the following steps:
1, select the bulk kelp (Lessonia Flavicans) of guluronic acid content 62%, after soaking washing, add soda ash and digest 12h at 68 DEG C, then thin up filters, and foaming, floating separation obtain clear glue solution.
2, with diatomite be flocculating aids carry out essence filter obtain glue;
3, the glue after essence filter adds 10% hydrochloric acid and changes into Lalgine, and dewaters;
4, after Lalgine dehydration, take methyl alcohol as medium, carry out being neutralized to pH6-8 with potassium hydroxide.
5, dewater after granulation, by flash dryer to moisture 22%, then be dried to moisture 12% with microwave dryer, be crushed to 170 orders.
Gained potassium alginate product viscosity: 390 mPas, pH:7.3,1% solution transparency 48cm, moisture 12%.
Above embodiment only in order to technical scheme of the present invention to be described, but not is limited; Although with reference to previous embodiment to invention has been detailed description, for the person of ordinary skill of the art, still can modify to the technical scheme described in previous embodiment, or equivalent replacement is carried out to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.
Claims (7)
1. a preparation method for alginate for dental impression material, is characterized in that it comprises the following steps:
(1) with the guluronic acid content brown alga that is 45-65% for raw material, wash with water logging, after alkali digestion, thin up, foaming, floating separation obtain clear glue solution;
(2) use flocculating aids to filter clear glue solution and obtain glue;
(3) the glue acid adding after filtering changes into Lalgine, dehydration;
(4) Lalgine after dehydration is medium with organic solvent, and add alkali lye to pH6-8, described organic solvent is one or more in methyl alcohol, ethanol, Virahol, acetone;
(5) dewater, use air stream drying to combine with micro-wave energy and carry out drying, use air stream drying to be 15-25% to moisture content, re-use micro-wave energy and be dried to moisture 5-15%, pulverize.
2. the preparation method of a kind of alginate for dental impression material according to claim 1, it is characterized in that the condition of alkali digestion in described step (1) is temperature 45-75 DEG C, digestion time is 8-14h.
3. the preparation method of a kind of alginate for dental impression material according to claim 1, is characterized in that in described step (2), flocculating aids is diatomite, and filter plant is that pressure type filters or vacuum filter.
4. the preparation method of a kind of alginate for dental impression material according to claim 1 and 2, is characterized in that the acid that in described step (3), acidifying is used is 5-15% sulfuric acid or hydrochloric acid.
5. the preparation method of a kind of alginate for dental impression material according to claim 1, is characterized in that alkali used in described step (4) is sodium hydroxide or potassium hydroxide.
6. the preparation method of a kind of alginate for dental impression material according to claim 1, is characterized in that air stream drying is used in described step (5) equipment is the one in flash dryer, impulse air flow drier or boiling drier.
7. the preparation method of a kind of alginate for dental impression material according to claim 1, is characterized in that being crushed to 150-200 order in described step (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210557686.5A CN102993330B (en) | 2012-12-20 | 2012-12-20 | Preparation method of alginate for dental impression material |
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| CN201210557686.5A CN102993330B (en) | 2012-12-20 | 2012-12-20 | Preparation method of alginate for dental impression material |
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| CN102993330A CN102993330A (en) | 2013-03-27 |
| CN102993330B true CN102993330B (en) | 2014-12-24 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004025495A1 (en) * | 2004-05-21 | 2005-12-15 | Dr. Suwelack Skin & Health Care Ag | Process for the production of alginate-containing porous moldings |
| AU2005295927B2 (en) * | 2004-10-12 | 2012-02-02 | Fmc Biopolymer As | Self-gelling alginate systems and uses thereof |
| WO2011132699A1 (en) * | 2010-04-22 | 2011-10-27 | 株式会社トクヤマデンタル | Alginic acid-containing aqueous composition, alginate impression material for dental applications, and substrate for alginate impression material for dental applications |
| CN102060938B (en) * | 2010-12-24 | 2012-10-17 | 青岛明月海藻集团有限公司 | Method for extracting algin through comprehensively utilizing brown algae |
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Effective date of registration: 20161212 Address after: 224100 Jiangsu province Yancheng City District Dafeng saline land marine industry science and Technology Park Patentee after: Jiangsu Mingyue Marine Biotechnology Co., Ltd. Address before: 266400 Qingdao, Shandong Province, the city of Jiaonan Road, No. 67 Patentee before: Qingdao Bright Moon Seaweed Group Co., Ltd. |