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Floating preparation process of Na2O-CaO-SiO2 system flat-plate opacified glass

A technology of 1.na2o-cao-sio2, opalescent glass, which is applied in the field of opalescent glass, can solve the problems of high price and inability to realize the preparation of flat opalescent glass, and achieve good opacifying effect, soft color and high production efficiency high effect

Inactive Publication Date: 2011-05-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent application number is 200810014768.9, and the title of the invention is "a fluorine-free environment-friendly opaque glass material and its manufacturing method". It discloses a fluorine-free environment-friendly opaque glass material. The raw materials of this invention patent opaque glass need to introduce strontium carbonate, Barium, lithium carbonate, and potassium carbonate are more expensive, and they are formed by casting method, so the preparation of flat opal glass cannot be realized

Method used

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  • Floating preparation process of Na2O-CaO-SiO2 system flat-plate opacified glass
  • Floating preparation process of Na2O-CaO-SiO2 system flat-plate opacified glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select the following components as raw materials (mass%)

[0027] SiO 2 63.9 Al 2 o 3 1.5B 2 o 3 5.0 CaO 11.7

[0028] MgO 2.4 Na 2 O 10.4 P 2 o 5 4.6 Clarifying agent 0.5

[0029] (1) Mix the above raw materials evenly, heat them to 1500°C in a glass melting furnace, and melt them into molten glass;

[0030] (2) The molten glass is cooled to 1200°C after being clarified and cooled, and the molten glass is introduced into the tin bath through the flow channel, formed by the float process, and polished at 1120°C;

[0031] (3) When the glass is cooled to 950°C, the corresponding viscosity is between 10 4.25 ~10 5.75 In between, the edge pulling machine is used for thinning, and the thickness of the glass ribbon is controlled to be 4-6mm;

[0032] (4) After the glass ribbon is cooled to 580°C, it enters the annealing kiln for uniform annealing, and the annealed glass ribbon is cut and trimmed to obtain an opaque glass plate.

Embodiment 2

[0034] Select the following components as raw materials (mass%)

[0035] SiO 2 67.9 Al 2 o 3 1.5B 2 o 3 5.0 CaO 9.7

[0036] MgO 1.4 Na 2 O 9.4 P 2 o 5 4.6 Clarifying agent 0.5

[0037](1) Mix the above raw materials evenly, heat them to 1525°C in a glass melting furnace, and melt them into molten glass.

[0038] (2) The molten glass is cooled to 1250°C after being clarified and cooled, and the molten glass is introduced into the tin bath through the flow channel, formed by the float process, and polished at 1160°C;

[0039] (3) When the glass is cooled to 970°C, the corresponding viscosity is between 10 4.25 ~10 5.75 In between, the edge pulling machine is used for thinning, and the thickness of the glass ribbon is controlled to be 6-8mm;

[0040] (4) The glass ribbon enters the annealing kiln at 600°C for uniform annealing, and the annealed glass ribbon is cut and trimmed to obtain an opaque glass plate.

Embodiment 3

[0042] Select the following components as raw materials (mass%)

[0043] SiO 2 71.0 Al 2 o 3 1.0B 2 o 3 4.0 CaO 7.0

[0044] MgO 2.1 Na 2 O 9.4 P 2 o 5 5.0 clarifier 0.5

[0045] (1) Mix the above raw materials evenly, heat them to 1550°C in a glass melting furnace, and melt them into molten glass.

[0046] (2) The molten glass is cooled to 1180°C after being clarified and cooled, then introduced into the tin bath through the flow channel, shaped by the float process, and polished at 1080°C;

[0047] (3) When the glass is cooled to 980°C ~ 880°C, the corresponding viscosity is 10 4.25 ~10 5.75 , use the graphite retaining wall method to stack the thickness, and control the thickness of the glass ribbon to 12-14mm;

[0048] (4) The glass ribbon enters the annealing kiln at 600°C for uniform annealing, and the annealed glass ribbon is cut and trimmed to obtain an opaque glass plate.

[0049] Table 1. Viscosity values ​​and temperature ranges corresponding to...

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Abstract

The invention relates to flat opacified glass of a Na2O-CaO-SiO2 system and a float preparation process thereof. The process comprises the following steps: evenly mixing clarifier and raw materials such as SiO2, Al2O3, B2O3, CaO, MgO, Na2O and P2O5, heating the mixture to melt into molten glass; clarifying and cooling the molten glass, and carrying out formation by a float process to obtain an opacified glass tape; and cooling the obtained opacified glass tape, drawing the opacified glass tape to become thin by adopting a side drawing machine, or stacking the opacified glass tape by adopting a graphite retaining wall method, then cooling and evenly annealing the obtained glass tape, and cutting the annealed glass tape to obtain an opacified glass board. The flat opacified glass has the following advantages: the thermal expansion coefficient of the flat opacified glass is between 6.0*10<-6> and 6.8*10<-6> / K, and the three-point bending strength is between 60 and 76 MPa; and the flat opacified glass has the advantages of environmental protection, low product cost, adjustable thickness, soft color, high whiteness, good integral opacifying effect, wide board surface, high surface quality, no need of mechanical polishing, and the like.

Description

technical field [0001] The present invention relates to a kind of opacity glass, relate to a kind of Na more specifically 2 O-CaO-SiO 2 Systematic flat opacified glass and its float preparation process. Background technique [0002] Opalescent glass is soft in color, pure in color and high in whiteness, and is a high-grade building decoration plate. Compared with sintered glass-ceramics, opacity glass does not contain pores inside, has very low water absorption, and is not easy to retain dirt. In addition, opal glass can be conveniently processed by cutting and hot bending. Besides being used as a decorative material, it can also be made into furniture of various shapes. At present, opacified glass usually uses fluoride as an opacifying agent, such as fluorite, sodium fluorosilicate, etc. During the melting process, fluoride will not only severely corrode the refractory material and shorten the life of the kiln, but also volatilize in large quantities, causing great harm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/097C03B18/02
Inventor 郑伟宏程金树何峰汤李缨全健
Owner WUHAN UNIV OF TECH
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