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Novel soda lime silicate glass compositions containing colemanite and methods for their preparation

A technology of colemanite and sodium calcium silicate, which is applied in the field of boron-containing sodium calcium silicate glass with improved chemical durability and boron-containing sodium calcium silicate glass to achieve high light transmittance , reduce the melting temperature, improve the effect of thermal and mechanical properties

Active Publication Date: 2019-01-15
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] d) Using colemanite (CaB 3 o 4 (OH) 3 ·H 2 O), the effect of calcium borate minerals as a source of both calcium oxide and boron oxide in soda lime silicate glasses has not been reported so far in the available literature

Method used

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  • Novel soda lime silicate glass compositions containing colemanite and methods for their preparation
  • Novel soda lime silicate glass compositions containing colemanite and methods for their preparation
  • Novel soda lime silicate glass compositions containing colemanite and methods for their preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment -1

[0102] The composition of the blank soda lime silicate flat glass obtained by weighing the necessary raw materials in proper proportions is 73.06wt% SiO 2 , 0.15wt% Al 2 o 3 , 13.7 wt% Na 2 O, 0.03 wt% K 2 O, 9.00wt% CaO, 4.00wt% MgO, and 0.02wt% TiO 2 , and 0.04 wt% Fe as an impurity from the starting material. Blank soda lime silicate flat glass was prepared as a control glass against all other glass compositions in the present invention under similar laboratory conditions. Carefully weighed and thoroughly mixed chemical batches were charged to platinum crucibles maintained in a 1450°C resistance furnace and melted at 1600°C for 2 hours. The cast glass was annealed at 550°C for 4 hours. The density of the glass was measured to be 2.4981g / cm 3 . The refractive index of glass at 587.6nm (n d ) is 1.5184 and the dispersion rate (n F -n C ) is calculated to be 0.0089. The CTE of a glass cylinder having a length of 25 mm and a diameter of 6 mm was found to be 91 x 10 ...

Embodiment -2

[0104] The composition of the resulting flat glass obtained by weighing the necessary raw materials in appropriate proportions is 68.80wt.% SiO 2 , 4.26 wt.% B 2 o 3 , 0.15wt.%Al 2 o 3 , 13.7 wt.% Na 2 O, 0.03 wt.% K 2 O, 8.83wt.% CaO, 4.00wt.% MgO, 0.13wt.% SrO, and 0.02wt.% TiO 2 , and 0.04 wt% Fe as an impurity from the starting material. Carefully weighed and thoroughly mixed chemical batches were charged to platinum crucibles maintained in a 1450°C resistance furnace and melted at 1550°C for 2 hours. The cast glass was annealed at 550°C for 4 hours. The density of the glass was measured to be 2.5396g / cm 3 . The refractive index of glass at 587.6nm (n d ) is 1.5243 and the dispersion rate (n F -n C ) is calculated to be 0.0086. The CTE of a glass cylinder having a length of 25mm and a diameter of 6mm measured in the temperature range of 50°C to 300°C was found to be 86×10 -7 K -1 , with an accuracy of ±1%. T obtained by dilatometer g and T d The values ​​...

Embodiment -3

[0106] The composition of the resulting flat glass obtained by weighing the necessary raw materials in appropriate proportions is 64.54wt.% SiO 2 , 8.52wt.%B 2 o 3 , 0.15wt.%Al 2 o 3 , 13.7 wt.% Na 2 O, 0.03 wt.% K 2 O, 8.69wt.% CaO, 4.00wt.% MgO, 0.27wt.% SrO, and 0.02wt.% TiO 2 , and 0.04 wt% Fe as an impurity from the starting material. Carefully weighed and thoroughly mixed chemical batches were charged to platinum crucibles maintained in a 1400°C resistance furnace and melted at 1500°C for 2 hours. The cast glass was annealed at 560°C for 4 hours. The density of the glass was measured to be 2.5507g / cm 3 . The refractive index of glass at 587.6nm (n d ) is 1.5298 and the dispersion rate (n F -n C ) is calculated to be 0.0087. The CTE of a glass cylinder having a length of 25mm and a diameter of 6mm measured in the temperature range of 50°C to 300°C was found to be 85×10 -7 K -1 , with an accuracy of ±1%. T obtained by dilatometer g and T dThe values ​​are...

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Abstract

The present invention relates to the development of new soda lime silicate glass compositions containing colemanite for use in energy efficient processes. The thermal, optical and mechanical properties of the evaluated glasses show that these inventive glasses are suitable for use in the manufacture of high-quality flat and container glasses specifically for solar panels with significantly lower batch melting temperatures of about 150°C. B derived from added colemanite was incorporated at its maximum level of 12.24 wt% for flat glass and at a maximum level of 13.24 wt% for container glass compositions 2 o 3 , while simultaneously replacing limestone (CaCO 3 ) up to 100%, resulting in an energy-efficient, cost-effective and environmentally friendly glass melting process.

Description

[0001] The following specification specifically describes the invention and the manner in which it is to be practiced: technical field [0002] The present invention relates to new soda lime silicate glass compositions containing colemanite and methods for their preparation. In particular, the present invention relates to the production of lower melting temperature, lower coefficient of thermal expansion, higher surface hardness, higher refractive index, higher glass transition temperature, higher dilatometric softening temperature (dilatometric softening temperature) and suitable for the production of containers Development of different boron-containing soda calcium silicate based compositions for improved chemical durability and production of flat glass by the float process. More specifically, the developed boron containing Soda-lime-silicate glasses are used in solar panels, eyeglass lenses and pyrex cookware. Background technique [0003] Soda lime silicate glass is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/091
CPCC03C3/091
Inventor 安纳普尔纳·卡利安杜尔格考希克·比斯瓦斯阿图尔·第亚内斯瓦尔·松塔凯兰詹·森
Owner COUNCIL OF SCI & IND RES