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Method for preparing chemically-strengthened glass

A technology of chemically tempered glass and glass, applied in glass manufacturing equipment, glass tempering, manufacturing tools, etc., can solve the problems of turbidity of molten potassium nitrate, uneven compressive stress on the surface of chemically tempered glass, affecting the performance and quality of chemically tempered glass, etc. , to achieve the effect of improving quality

Active Publication Date: 2014-04-23
江苏锡佛光电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they all ignore an important aspect: Potassium nitrate is often mixed with Ca 2+ , Mg 2+ Impurities such as ions will be deposited on the surface of the glass during ion exchange, resulting in uneven compressive stress on the surface of the chemically tempered glass, and due to Ca 2+ , Mg 2+ Precipitation is easy to form, causing turbidity of molten potassium nitrate, affecting the performance and quality of chemically tempered glass

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] In the preparation method of the chemically tempered glass of the present invention, it is first necessary to prepare potassium nitrate molten liquid: add potassium nitrate solid and potassium stannate solid in the intensified furnace salt tank in sequence, and heat it at 380-400°C to melt it into a molten liquid , and stir well. Potassium stannate should not be excessive, preferably 0.2 to 0.8% of the quality of potassium nitrate. Ca mixed in it can be effectively precipitated by adding potassium stannate to potassium nitrate 2+ , Mg 2+ and other impurity ions, so that the potassium nitrate melt remains clear, thereby improving the quality of chemically tempered glass.

[0013] Then put the ordinary glass into the preheating furnace to preheat to 300~380℃, immerse in the molten liquid at 400~450℃ for ion exchange reaction for 3~5 hours, then lift it to the annealing furnace to cool to room temperature. In this step, the glass should be preheated before being immerse...

Embodiment 1

[0017] This embodiment provides a method for preparing chemically tempered glass, comprising the following steps:

[0018] (a) Add 100kg of potassium nitrate solid and 0.8kg of potassium stannate solid to the salt tank of the intensified furnace in turn, heat at 380°C to make it melt into a molten liquid, and stir evenly;

[0019] (b) Preheat ordinary glass to 350°C in a preheating furnace, immerse in molten liquid for ion exchange reaction at 420°C for 5 hours, and then lift it to an annealing furnace to cool to room temperature;

[0020] (c) Immerse the obtained glass in a citric acid solution with a mass concentration of 1% for 30 minutes, take it out, and wash it.

Embodiment 2

[0022] This embodiment provides a method for preparing chemically tempered glass, comprising the following steps:

[0023] (a) Add 100kg of potassium nitrate solid and 0.2kg of potassium stannate solid into the salt tank of the intensified furnace in sequence, heat at 400°C to make it melt into a molten liquid, and stir evenly;

[0024] (b) Preheat ordinary glass to 380°C in a preheating furnace, immerse in molten liquid for ion exchange reaction at 450°C for 3 hours, and then lift it into an annealing furnace to cool to room temperature;

[0025] (c) Immerse the obtained glass in a citric acid solution with a mass concentration of 15% for 20 minutes, then take it out and wash it.

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PUM

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Abstract

The invention relates to a method for preparing chemically-strengthened glass. The method comprises the following steps: (a) sequentially adding potassium nitrate solid and potassium stannate solid into a strengthening-furnace salt bath, heating at the temperature of 380-400 DEG C, so as to melt and form molten liquid, and stirring uniformly; (b) putting common glass in a preheating furnace, preheating to the temperature of 300-380 DEG C, submerging the preheated glass in the molten liquid obtained in the step (a), carrying out ion-exchange reaction for 3-5 hours at the temperature of 400-450 DEG C, then, feeding to an annealing furnace, and cooling to room temperature; (c) submerging the glass obtained in the step (b) in a weak-acid solution for 20-30 minutes, then, taking out and cleaning, thereby obtaining the chemically-strengthened glass. According to the method for preparing the chemically-strengthened glass, disclosed by the invention, impurity ions, such as Ca<2+>, Mg<2+> and the like, mixed with potassium nitrate can be effectively precipitated through adding potassium stannate into potassium nitrate, so that potassium nitrate molten liquid is kept clarified, and then the quality of the chemically-strengthened glass is improved.

Description

technical field [0001] The invention relates to the field of glass processing, in particular to a method for preparing chemically tempered glass. Background technique [0002] Tempered glass is obtained by cutting and grinding ordinary annealed glass to the required size, then heating to a temperature close to the softening point, and then rapidly and uniformly cooling. After tempering, uniform compressive stress is formed on the surface of the glass, while tensile stress is formed inside, which improves the bending and impact strength of the glass, and its strength is about four times that of ordinary annealed glass. According to different production processes, tempered glass is divided into physically tempered glass and chemically tempered glass. Among them, physical tempered glass (also known as tempered tempered glass) is to heat ordinary flat glass in a heating furnace to a temperature close to the softening temperature of the glass (600°C), eliminate internal stress ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B27/03
Inventor 高纯潘基建王明爱
Owner 江苏锡佛光电科技有限公司