CN107572773B - Optical glass capable of effectively reducing adhesion with mold - Google Patents
Optical glass capable of effectively reducing adhesion with mold Download PDFInfo
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- CN107572773B CN107572773B CN201710812182.6A CN201710812182A CN107572773B CN 107572773 B CN107572773 B CN 107572773B CN 201710812182 A CN201710812182 A CN 201710812182A CN 107572773 B CN107572773 B CN 107572773B
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Abstract
The invention discloses optical glass capable of effectively reducing the adhesion with a mold, which comprises the following components in parts by weight: SiO 22: 21-29 parts, B2O3: 20-32 parts of La2O3: 20 to 25 portions of TiO2: 10-15 parts of ZrO2: 15-20 parts of Li2O: 5-10 parts of Nb2O5: 5-15 parts of CaO: 15-25 parts of Fe2O3: 4-13 parts.
Description
Technical Field
The invention relates to the field of optical glass, in particular to optical glass capable of effectively reducing the adhesion with a mold.
Background
When glass molded products such as aspherical lenses are obtained by precision press molding, since press molding is required in a high temperature environment, a mold used in this case is also exposed to the high temperature environment and is subjected to a high press pressure. Therefore, in the case of heating and softening the lens preform material and in the case of press-molding the lens preform material, the mold molding surface is often not maintained at a high precision because of oxidation and corrosion of the mold molding surface, damage to the parting film provided on the surface of the mold molding surface, and the mold itself is easily damaged. When the above-described situation occurs, the mold will have to be replaced, so that the number of times of replacement of the mold is increased, and low-cost mass production cannot be achieved. Therefore, in order to suppress the damage, maintain a high-precision mold surface of a mold for a long period of time, and realize precision press molding at a low press pressure, it is desired that a glass used as a lens preform material for precision press molding has a glass transition temperature (Tg) as low as possible.
When precision press molding is performed, the surface of the glass as the lens preform material needs to be in a mirror or nearly mirror state. The lens preform is usually produced directly from molten glass by a dropping method or by grinding and polishing, but the former method is more commonly used in consideration of cost, number of steps, and the like. The lens preform material produced by the dropping method is called gobs (gobs) or glass gobs. Optical glass for precision press molding generally has disadvantages such as poor chemical durability, occurrence of overburning defects (burning) on the surface of the above-mentioned gob, and gradual failure to maintain a mirror surface or a nearly mirror surface. In particular, when the produced block is stored, problems arise, and the surface weather resistance of chemical durability is also an important characteristic.
Disclosure of Invention
The invention aims to solve the technical problems that the chemical durability is poor, the surface of a material block can generate an overburning defect and the state of a mirror surface or a similar mirror surface can not be maintained any more, and the like, and aims to provide optical glass which effectively reduces the adhesion with a mold and solve the problems that the glass is easy to adhere with the mold and the chemical durability is poor during compression molding.
The invention is realized by the following technical scheme:
the optical glass capable of effectively reducing the adhesion with a mold comprises the following components in parts by weight: SiO 22: 21-29 parts, B2O3: 20-32 parts of La2O3: 20 to 25 portions of TiO2: 10-15 parts of ZrO2: 15-20 parts of Li2O: 5-10 parts of Nb2O5: 5-15 parts of CaO: 15-25 parts of Fe2O3: 4-13 parts.
The optical glass capable of effectively reducing the adhesion with a mold comprises the following components in parts by weight: SiO 22: 25 parts of B2O3: 27 parts of La2O3: 21 parts of TiO2: 13 parts of ZrO2: 17 parts of Li2O: 8 parts of Nb2O5: 14 parts of CaO: 23 parts of Fe2O3: 11 parts.
An optical glass effective for reducing adhesion to a mold, said glass having a basicity of less than 10.
An optical glass effective for reducing blocking with a mold, said glass having a refractive index of 1.72 to 1.74.
An optical glass which is a glass for press molding and is effective in reducing adhesion to a mold.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the optical glass prepared by the invention has better chemical durability, can effectively reduce the adhesion between the glass and the mold when in use, and is more convenient to use;
2. the optical glass effectively reduces the adhesion with the mold, the components of the optical glass supplement each other, and the prepared glass has better performance and higher use efficiency.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1
The invention discloses optical glass capable of effectively reducing the adhesion with a mold, which comprises the following components in parts by weight: SiO 22: 25 parts of B2O3: 27 parts of La2O3: 21 parts of TiO2: 13 parts of ZrO2: 17 parts of Li2O: 8 parts of Nb2O5: 14 parts of CaO: 23 parts of Fe2O3: 11 parts. The basicity of the glass is less than 10. The refractive index of the glass is 1.72-1.74. The optical glass is glass for compression molding.
Example 2
The invention discloses optical glass capable of effectively reducing the adhesion with a mold, which comprises the following components in parts by weight: SiO 22: 10 parts of B2O3: 2 parts of La2O3: 8 parts of TiO2: 3 parts of ZrO2: 7 parts of Li2O: 2 parts of Nb2O5: 3 parts of CaO: 5 parts of Fe2O3: and 2 parts. The basicity of the glass is less than 10. The refractive index of the glass is 1.72-1.74. The optical glass is glass for compression molding.
Example 3
The invention discloses optical glass capable of effectively reducing the adhesion with a mold, which comprises the following components in parts by weight: SiO 22: 35 parts of B2O3: 47 parts of La2O3: 37 parts of TiO2: 35 parts of ZrO2: 28 parts of Li2O: 24 parts of Nb2O5: 26 parts and CaO: 37 parts of Fe2O3: 26 parts of (A). The basicity of the glass is less than 10. The refractive index of the glass is 1.72-1.74. The optical glass is glass for compression molding.
In summary, the values of example 2 and example 3 are outside the range of the present invention, the components and values of example 1 are within the present invention, the adhesion of the glass prepared in example 1 to the mold is the lowest, the adhesion of example 2 and example 3 is higher than that of example 1, and compared with the existing glass, the adhesion of example 1 is lower than 18% of that of the existing glass, and the adhesion of example 2 and example 3 is lower than 3% and 4% of that of the existing glass, respectively.
Therefore, the components supplement each other, and in the components and value range of the invention, the prepared glass has lower adhesion with the mould, better performance, convenient use and higher quality.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The optical glass capable of effectively reducing the adhesion with a mold is characterized by comprising the following components in parts by weight: SiO 22: 21-29 parts, B2O3: 20-32 parts of La2O3: 20 to 25 portions of TiO2: 10-15 parts of ZrO2: 15-20 parts of Li2O: 5-10 parts of Nb2O5: 5-15 parts of CaO: 15-25 parts of Fe2O3: 4-13 parts.
2. The optical glass capable of effectively reducing the adhesion with the mold as claimed in claim 1, which is characterized by comprising the following components in parts by weight: SiO 22: 25 parts of B2O3: 27 parts of La2O3: 21 parts of TiO2: 13 parts of ZrO2: 17 parts of Li2O: 8 parts of Nb2O5: 14 parts of CaO: 23 parts of Fe2O3: 11 parts.
3. An optical glass effective for reducing adhesion to a mold as defined in claim 1 wherein the glass has a basicity of less than 10.
4. An optical glass effective for reducing adhesion to a mold as defined in claim 1, wherein the glass has a refractive index of 1.72 to 1.74.
5. The optical glass effective for reducing blocking with a mold according to claim 1, wherein the optical glass is a glass for press molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710812182.6A CN107572773B (en) | 2017-09-11 | 2017-09-11 | Optical glass capable of effectively reducing adhesion with mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710812182.6A CN107572773B (en) | 2017-09-11 | 2017-09-11 | Optical glass capable of effectively reducing adhesion with mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107572773A CN107572773A (en) | 2018-01-12 |
| CN107572773B true CN107572773B (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710812182.6A Active CN107572773B (en) | 2017-09-11 | 2017-09-11 | Optical glass capable of effectively reducing adhesion with mold |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4726666B2 (en) * | 2006-03-22 | 2011-07-20 | Ｈｏｙａ株式会社 | Optical glass, optical element and manufacturing method thereof |
| CN101844866A (en) * | 2009-03-24 | 2010-09-29 | Hoya株式会社 | Optical glass, as well as frit for compacting forming, optical element blank, optical element and manufacturing method thereof |
| KR101347944B1 (en) * | 2009-05-20 | 2014-01-07 | 호야 가부시키가이샤 | Glass material for press forming, method for manufacturing glass optical element using same, and glass optical element |
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- 2017-09-11 CN CN201710812182.6A patent/CN107572773B/en active Active
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