CN106608713A - Method for removing surface compressive stress of toughened glass through chemical ion exchange - Google Patents
Method for removing surface compressive stress of toughened glass through chemical ion exchange Download PDFInfo
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- CN106608713A CN106608713A CN201510711231.8A CN201510711231A CN106608713A CN 106608713 A CN106608713 A CN 106608713A CN 201510711231 A CN201510711231 A CN 201510711231A CN 106608713 A CN106608713 A CN 106608713A
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Abstract
The invention provides a method for removing surface compressive stress of toughened glass through chemical ion exchange. The toughened glass is put into a mixed solution of potassium nitrate and sodium nitrate after preheating. K+ with a large ionic radius in the glass is replaced with Na+ with a small ionic radius in the solution through an ion exchange method. The concentration of the Na+ in the solution is maintained in 140000 ppm or above. According to the method for removing the surface compressive stress of the toughened glass through the chemical ion exchange, firstly, surface compressive stress removing is conducted on the toughened glass with the sand blasting effect, and then follow-up process treatment is conducted, so that product bending caused by the stress difference of the toughened glass can be avoided, the using rate of products is increased, and the high-flatness and high-quality toughened glass smooth surface is obtained.
Description
Technical field
The present invention relates to strengthened glass panel processing technique field, especially, is related to a kind of strong by the removal of chemical ion exchange process
The technique for changing glass surface compressive stress.
Background technology
Glass lens because its light transmission is good, touch and the features such as handling property is excellent, progressively instead of the eyeglass of acrylic material
It is widely used.Safety glass (Tempered glass/Reinforced glass) is a kind of prestressed glass.In preparation process,
To improve the intensity of safety glass, method chemically or physically is usually used, compressive stress layer is formed in glass surface so that glass
Offset skin stress when bearing external force first, so as to improve the integrated carrying ability of glass, reinforcing glass itself anti-wind pressure,
The physical properties such as cold and summer-heat, impact.The safety glass impact strength of condition of equivalent thickness is 3～5 times of simple glass, and bending resistance is strong
Degree is 3～5 times of simple glass.Therefore, the reinforcing processing technique of glass is widely spread, but due to the thing of safety glass itself
Rationality matter is limited, and which is highly susceptible to damage in process, easily produces scuffing.
When the stress of glass refers to that glass is deformed due to exopathogenic factor (stress, humidity, change of temperature field etc.), each portion in glass
The internal force a that/generation interacts, to resist the effect of this exopathogenic factor, and the position for attempting to make glass from after deformation returns to
Position before deformation.Glass surface compressive stress refers to glass in molding, due to the difference of inside and outside rate of cooling, in glass surface
The internal stress of residual.In general, the safety glass that tempering is handled well, it is impossible to remake the secondary operations such as any cutting, grinding
Or breakage is subject to, otherwise it is easy to cause glass profile to produce change because destroying the uniform compressive stress balance on surface, or is broken into
It is similar to cellular obtuse angle little particle.
And at present for the scuffing of strengthens glass is processed, be to be directly over plain grinding and remove scratching, this technique the disadvantage is that, because by force
The bearing stress for changing glass affects, and Jing after strengthens glass grinding machine, glass can become bended, and profile is seriously affected, effect
It is not good.Particularly with the strengthens glass of particular design, for example, the strengthens glass of sandblasting is only carried out to glass local, is scratched removing
Before, sand face need to be protected, place into grinding machine and be ground, as the upper and lower stock removal of grinding machine is inconsistent and sand face should with bright finish
The problem of power difference, eventually make product occur warpage, cause the strengthens glass with sandblasting effect cannot carry out scratch reparation or
Person is scratched after repairing, and its angularity does not reach customer requirement, or manually can only repair, and its efficiency is low, expends a large amount of people
Power.
Therefore, the subsequent treatment for how mitigating strengthens glass surface stress and being scratched, is the problem for unanimously endeavouring in the industry to solve.
The content of the invention
Present invention aim at a kind of method for exchanging elimination strengthens glass bearing stress by chemical ion is provided, it is strong to solve
Change glass surface because there is the technical problem of stress or the subsequent treatment that there is stress difference and cannot be scratched.
For achieving the above object, the invention provides a kind of exchange the method for eliminating strengthens glass bearing stress by chemical ion：
By the preheating glass after reinforcing to 100 DEG C -480 DEG C, be put into 380 DEG C -450 DEG C potassium nitrate and sodium nitrate mixing it is molten
In liquid, by ion exchange, by glass Ionic Radius big K+The Na+ little with effects of ion radius enters line replacement.
Preferably, strengthens glass is preheated to into temperature at 100 DEG C -480 DEG C, its preheating time is between 60min～120min.
Preferably, first sodium nitrate and the heating of potassium nitrate hybrid solid are dissolved, wherein Na ion concentration exists
Within 135000ppm～243000ppm, between 380 DEG C～450 DEG C, the immersion time of strengthens glass exists its temperature
Between 60min～180min.
Preferably, the Na in solution+Concentration is 135000ppm～243000ppm.
Preferably, in solution, the concentration range of potassium ion is 38000ppm～190000ppm.
The invention has the advantages that：
Strengthens glass of the present invention mainly to there is sandblasting effect first carries out bearing stress removal, then carries out subsequent technique process, can
The utilization rate of product to avoid product from causing product to bend because of its stress difference, is improved, high-flatness, high-quality strong is obtained
Change glass smooth surface.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.Below
By reference picture, the present invention is further detailed explanation.
Description of the drawings
The accompanying drawing for constituting the part of the application is used for providing a further understanding of the present invention, the illustrative examples of the present invention and
Which is illustrated for explaining the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the ion exchange principle schematic diagram of the preferred embodiment of the present invention；
Fig. 2 is the strengthens glass bearing stress analysis diagram of the preferred embodiment of the present invention；
Fig. 3 is the strengthens glass bearing stress analysis diagram after the process of the preferred embodiment of the present invention；
Wherein, 1, glass substrate, 2, Surface stress layer, 3, surface Na+Layer.
Specific embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be limited and be covered according to claim
The multitude of different ways of lid is implemented.
Referring to Fig. 1, the present invention is exchanged by chemical ion and removes glass surface compressive stress (CS), and step is as follows：By what is strengthened
Glass is first preheated, then is transferred to and is furnished with NaNO3Mixed solution in carry out High temperature ion exchange, make K in glass+In solution
Na+Enter line replacement, allow less ionic radius Na in solution+The K for replacing glass Ionic Radius bigger+, to reach removal glass
The purpose of glass bearing stress, reaction principle formula are as follows：
K+ Glass+Na+ Liquid→Na+ Glass+K+ Liquid
Specific embodiment is as follows：
The first step：Dissolved salt stage, potassium nitrate (powdery) and sodium nitrate (powdery) by weight 2:It is added to after 5 ratio mixing
Move back in stress stove, be then turned on power supply, by temperature debugging to moving back 410 DEG C of stress, after which dissolves completely, obtain potassium nitrate with
The mixed solution of sodium nitrate, constant temperature 12H；
The concentration range of sodium ion：135000ppm～243000ppm；The concentration range of potassium ion：38000ppm～190000ppm；
Second step：Warm-up phase, strengthens glass is put in preheating furnace and is preheated；
Preheating temperature：Temperature is set in into 360 DEG C～420 DEG C, temperature control is within design temperature ± 2 DEG C；
Preheating time：Time is set in 60min～120min；
3rd step：Stage of stress is moved back, product is transferred to from preheating furnace and is moved back stress stove；Product is put into 380 DEG C -450 DEG C
In the mixed solution of potassium nitrate and sodium nitrate；
4th step：Come out of the stove slow cooling.
The control of preheating temperature, preheating time, Na ion concentration is should be noted in said process specifically, if preheating temperature is answered with moving back
Power temperature difference is excessive, and product moves back the percent defective that product can be caused in stress stove and increases being transferred to, so needing preheating temperature
Can be consistent with stress temperature is moved back；Preheating time is controlled in 60～120min, makes product temperature reach 410 DEG C or so, if when
Between it is long, deformation of products can be made；Na ion concentration must in claimed range, if Na ion concentration is too high, after having moved back stress,
Product is highly brittle, and chipping can increase；If Na ion concentration is too low, surface stress can be prevented from being completely eliminated, not reach to move back and answer
The effect of power.
In said process, early stage is due to the Na in glass+With the Na in solution+Concentration difference than larger, sodium ion in liquor is dense
Within spending for 243000ppm, the Na being far longer than in glass+Concentration, then Na in solution+The diffusivity of ion is strong, in solution
Na+Can with than VELOCITY DIFFUSION faster in glass；Due to the K in glass+Concentration is higher than K in solution+Concentration, so
Likewise, the K in glass+Also can with than VELOCITY DIFFUSION faster in solution；With the Na in solution+Concentration is gradually reduced,
Work as NA+Concentration is less than 140000ppm, Na+With K+Diffusion velocity can be affected, and ion-exchange speed can become slow, its table
Face stress occurs stress-retained, is not completely eliminated.Therefore NA+Concentration must be controlled in 135000ppm～243000ppm
It is effective using in interval, if concentration is not reached when requiring, now need the additional NaNO toward groove3, to improve Na+Concentration, increases
Strong its diffusivity.
Referring to Fig. 2 and Fig. 3, the strengthens glass bearing stress analysis diagram respectively after before processing.In Fig. 2, in glass substrate 1
Both side surface on be covered with K+The Surface stress layer of composition, in the Fig. 3 after the process of the application method, in K+The table of composition
Outside the stressor layers of face, one layer of Na is covered again+The surface layer of composition, eliminates stress.
The design parameter of other embodiment is as follows：
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for those skilled in the art
For, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made, etc.
With replacement, improvement etc., should be included within the scope of the present invention.
Claims (5)
- It is 1. a kind of that the method for eliminating strengthens glass bearing stress is exchanged by chemical ion, it is characterised in that：By the preheating glass after reinforcing to 100 DEG C -480 DEG C, be put into 380 DEG C -450 DEG C potassium nitrate and sodium nitrate mixing it is molten In liquid, by ion exchange, by glass Ionic Radius big K+The Na little with effects of ion radius+Enter line replacement.
- 2. method according to claim 1, it is characterised in that strengthens glass is preheated to into temperature at 100 DEG C -480 DEG C, Its preheating time is between 60min～120min.
- 3. method according to claim 1, it is characterised in that also include, first sodium nitrate and potassium nitrate hybrid solid are added Thermosol, wherein Na ion concentration within 135000ppm～243000ppm, its temperature between 380 DEG C～450 DEG C, reinforcing The immersion time of glass is between 60min～180min.
- 4. method according to claim 1, it is characterised in that the Na in solution+Concentration is 135000ppm～243000ppm.
- 5. method according to claim 1, it is characterised in that the concentration range of potassium ion is in solution 38000ppm～190000ppm.
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| CN201510711231.8A CN106608713A (en) | 2015-10-27 | 2015-10-27 | Method for removing surface compressive stress of toughened glass through chemical ion exchange |
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| CN201510711231.8A CN106608713A (en) | 2015-10-27 | 2015-10-27 | Method for removing surface compressive stress of toughened glass through chemical ion exchange |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986609A (en) * | 2017-12-04 | 2018-05-04 | 广东北玻电子玻璃有限公司 | The steel process method of display screen glass plate |
| CN109279766A (en) * | 2018-11-13 | 2019-01-29 | 信利光电股份有限公司 | A method of recycling chemically toughened glass |
| WO2019134133A1 (en) * | 2018-01-05 | 2019-07-11 | 南昌欧菲光学技术有限公司 | Method for strengthening glass ceramic and method for manufacturing glass ceramic cover plate |
| CN111056749A (en) * | 2019-12-31 | 2020-04-24 | 中建材蚌埠玻璃工业设计研究院有限公司 | Chemical strengthening method for high-alumina glass |
| CN111348841A (en) * | 2020-03-26 | 2020-06-30 | 常熟佳合显示科技有限公司 | Chemical strengthening method for improving falling resistance and surface hardness of glass |
| CN111393039A (en) * | 2020-03-25 | 2020-07-10 | 东莞市晶博光电有限公司 | Glass strengthening method, strengthened glass and glass for touch screen |
| CN112055702A (en) * | 2017-10-17 | 2020-12-08 | Pgbc智能控股有限责任公司 | Novel examples of chemically strengthened thin glass substrates for improved curvature and methods of manufacture |
| CN112203993A (en) * | 2018-05-31 | 2021-01-08 | 康宁股份有限公司 | Reverse ion exchange process for lithium-containing glass |
| CN112739658A (en) * | 2018-09-20 | 2021-04-30 | 康宁股份有限公司 | Reverse ion exchange process for lithium-containing glasses |
| CN112851143A (en) * | 2021-03-23 | 2021-05-28 | 东莞市瑞立达玻璃盖板科技股份有限公司 | Process for eliminating stress layer of chemically strengthened glass |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112055702A (en) * | 2017-10-17 | 2020-12-08 | Pgbc智能控股有限责任公司 | Novel examples of chemically strengthened thin glass substrates for improved curvature and methods of manufacture |
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| WO2019134133A1 (en) * | 2018-01-05 | 2019-07-11 | 南昌欧菲光学技术有限公司 | Method for strengthening glass ceramic and method for manufacturing glass ceramic cover plate |
| JP2021525208A (en) * | 2018-05-31 | 2021-09-24 | コーニング インコーポレイテッド | Reverse ion exchange treatment of lithium-containing glass |
| JP7344909B2 (en) | 2018-05-31 | 2023-09-14 | コーニング インコーポレイテッド | Reverse ion exchange treatment of lithium-containing glass |
| CN112203993A (en) * | 2018-05-31 | 2021-01-08 | 康宁股份有限公司 | Reverse ion exchange process for lithium-containing glass |
| CN112203993B (en) * | 2018-05-31 | 2023-05-09 | 康宁股份有限公司 | Reverse ion exchange process for lithium-containing glass |
| CN112739658B (en) * | 2018-09-20 | 2023-05-30 | 康宁股份有限公司 | Reverse ion exchange process for lithium-containing glasses |
| CN112739658A (en) * | 2018-09-20 | 2021-04-30 | 康宁股份有限公司 | Reverse ion exchange process for lithium-containing glasses |
| CN109279766A (en) * | 2018-11-13 | 2019-01-29 | 信利光电股份有限公司 | A method of recycling chemically toughened glass |
| CN111056749A (en) * | 2019-12-31 | 2020-04-24 | 中建材蚌埠玻璃工业设计研究院有限公司 | Chemical strengthening method for high-alumina glass |
| CN111393039A (en) * | 2020-03-25 | 2020-07-10 | 东莞市晶博光电有限公司 | Glass strengthening method, strengthened glass and glass for touch screen |
| CN111348841A (en) * | 2020-03-26 | 2020-06-30 | 常熟佳合显示科技有限公司 | Chemical strengthening method for improving falling resistance and surface hardness of glass |
| CN112851143A (en) * | 2021-03-23 | 2021-05-28 | 东莞市瑞立达玻璃盖板科技股份有限公司 | Process for eliminating stress layer of chemically strengthened glass |
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Application publication date: 20170503 |