Compound clarifying agent for high aluminosilicate glass

A high-alumina silicate and composite clarifying agent technology, which is applied in the field of glass production, can solve problems such as increased cost and complex composition of clarifying agents, and achieve the effects of eliminating air bubbles, saving raw materials, and improving light transmittance

Active Publication Date: 2019-01-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the clarifying agent is complex, and fumed silica and silica sol are not common raw materials in the glass industry, and adding them will lead to a substantial increase in cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Main glass material (weight percent): 21.8% Na 2 CO 3 12.4%Al 2 o 3 65.8% SiO2 2 ;

[0037] Composite clarifying agent composition (percentage by weight, based on the total weight of the main glass material): 0.85% NaNO 3 , 0.9% NaCl, 0.3% CeO 2 .

[0038] Glass preparation process, specifically:

[0039] Mix the raw materials evenly and put them into the corundum crucible. When the high-temperature furnace reaches 1200°C, put the crucible into the furnace and keep it at this temperature for 30 minutes to make the raw materials fully form glass liquid. Then raise the temperature to 1630°C at 5°C / min. ℃ for 1h10min, and finally pour the molten glass into a stainless steel mold, immediately put it into an annealing furnace at 610℃, keep it for 2h and then cool down to room temperature with the furnace.

[0040] The detection process of glass clarification effect:

[0041] Cut the glass into a shape of 15×15×7mm, polish the surface smooth, and count the number and d...

Embodiment 2

[0044] Main glass material (weight percent): 21.6% Na 2 CO 3 2.1% H 3 BO 3 12.2%Al 2 o 3 64.2% SiO2 2 ;

[0045] Composite clarifying agent composition (percentage by weight, based on the total weight of the main glass material): 0.85% NaNO 3 , 0.9% NaCl, 0.3% CeO 2 .

[0046] Clarification effect: After clarification at 1630°C for 1h10min, there is no visible bubble inside the glass.

Embodiment 3

[0048] Main glass material (weight percent): 21.1% Na 2 CO 3 6.0% H 3 BO 3 11.9%Al 2 o 3 61.0% SiO2 2 ;

[0049] Composite clarifying agent composition (percentage by weight, based on the total weight of the main glass material): 0.85% NaNO 3 , 0.9% NaCl, 0.3% CeO 2 .

[0050] Clarification effect: After clarification at 1630°C for 1h10min, there is no visible bubble inside the glass.

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PUM

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Abstract

The invention discloses a compound clarifying agent for high aluminosilicate glass. The compound clarifying agent comprises the following raw materials in percentage by weight: 39 to 63 percent of sodium nitrate; 21 to 46 percent of sodium chloride; 10 to 26 percent of cerium dioxide. The compound clarifying agent comprises the sodium nitrate (NaNO3), sodium chloride (NaCl) and cerium dioxide (CeO2) with certain contents, can obviously improve the clarifying speed of glass, obviously reduce the quantity of minute bubbles (d is smaller than 0.2 micrometer), and further improve the light transmittance of glass, and is green and environmentally friendly, and particularly applicable to high aluminosilicate glass and high aluminosilicate glass containing boron. The compound clarifying agent canrealize rapid and thorough bubble elimination at an optimum proportion, thereby reducing the production cost and improving the production efficiency.

Description

technical field [0001] The invention relates to the field of glass production, in particular to a composite clarifier for high aluminosilicate glass. Background technique [0002] Bubbles in glass are one of the main defects of glass products. A small amount of bubbles will directly reduce the mechanical properties of the glass. If the bubbles continue to increase, the optical properties of the glass will also deteriorate. In the production process of glass, clarifiers are commonly used to achieve the purpose of eliminating air bubbles in the glass. And any raw material that can generate gas by pyrolysis (gasification) during the glass melting process or reduce the viscosity of the glass liquid to promote the elimination of bubbles in the glass liquid becomes a clarifying agent. Refining agents are required throughout the melting stages of glass. [0003] According to the mechanism of glass clarification, it can be divided into: oxygen clarification, sulfur clarification, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C1/00
CPCC03C1/00
Inventor 赵高凌占丰朱钦塨韩高荣
Owner ZHEJIANG UNIV
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