CN102464447A - Float transparent glass - Google Patents

Abstract

The invention provides float transparent glass. The float transparent glass comprises a glass base component and a color complementing agent, wherein the color complementing agent is cobalt oxide, and the dosage of the color complementing agent is less than or equal to 0.0002% of the total mass of the glass. According to the float transparent glass, the cobalt oxide serving as the color complementing agent is added in the melting process of the float transparent glass to eliminate the faint yellow (namely physical decoloration) of the transparent glass, so that the long-standing problem that the color of the transparent glass is turned to be yellowish is solved, the visible light transmittance of 5mm of the transparent glass is higher than 89.0 percent, and b is^*The value is within 0.20, and the original piece of transparent glass with high quality (easy color mixing) is provided for the production of coated glass with higher quality requirements.

Description

A float transparent glass

technical field

The invention relates to float glass, in particular to a float transparent glass.

Background technique

As a light-transmitting material, glass is widely used in construction, automobile and other industries. Glass technology has completely penetrated into the automobile industry and has become an indispensable member in the field of automobile technology. The impurity iron oxide in the glass has two chemical valence states. The actual color tone of the glass depends on the total impurity iron content and ferrous oxide content. When the mass ratio of FeO to total iron oxide is less than 28%, the color tone of the transparent glass will be yellowish. According to the current The known technology of float glass production is also difficult to solve the problem of yellowish tint of transparent glass (when b ^* > 0.2, the glass color is yellowish, and human vision is particularly sensitive to yellow), which requires high quality coatings. Glass production is extremely unfavorable. To improve the light transmittance and whiteness of the glass, it is necessary to reduce the iron content in the glass. Since the content of iron oxide in domestic glass raw materials is between 0.07-0.15%, which is higher than that of major foreign producing countries, it affects the appearance quality of domestic floating transparent glass. In order to improve the whiteness and light transmittance of glass in China, two methods are mainly used. The first method is to reduce the iron content in raw materials by washing with water. This method is expensive and should not be adopted. Another method is to decolorize the glass, including chemical decolorization and physical decolorization. Chemical decolorization is to use CeO ₂ , As ₂ O ₃ and Sb ₂ O ₃ as decolorizers, together with oxidant NaNO ₃ , the combination of the two makes Fe ²⁺ is oxidized to Fe ³⁺ , which reduces the coloring of the glass (reduces the green color). This method tends to cause microbubbles on the surface of the glass panel.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a kind of float transparent glass with high visible light transmittance and high whiteness.

To achieve the above object, the technical solution adopted in the present invention is:

A float transparent glass, comprising glass base components and a color correcting agent, the color correcting agent is cobalt oxide, and the dosage is less than or equal to 0.0002% of the total mass of the glass.

The basic components of the glass contain 71-73% _{of SiO2} , 13-15% of _R2O , 8-10% of CaO, 3-5% of MgO, _0-2 % of _Al2O3 , 0-0.5% of _SO3 and The impurity iron oxide is 0.06-0.09% and the impurity titanium oxide is 0-0.05%, wherein R represents a monovalent element.

The optical performance of the 5mm glass is Tvis: 89.5±0.5%, a ^* : -1.15±0.20, b ^* : 0.10±0.10.

Beneficial effects of the present invention: the light yellow color in the transparent glass is eliminated (i.e. physical decolorization) by adding a color-complementing agent cobalt oxide in the melting process of the float transparent glass, which solves the long-standing problem that the color tone of the transparent glass is yellowish, and makes The visible light transmittance of transparent glass to 5mm is higher than 89.0%, and the b ^* value is within 0.20. It provides high-quality (very easy to color) original transparent glass for the production of coated glass with high quality requirements.

Detailed ways

The float transparent glass of the present invention is prepared by adding a color correcting agent cobalt oxide into the transparent glass batch material to eliminate the light yellow in the transparent glass (that is, physically decolorize).

Example 1

Apply known float glass production technology, by batching a dynamic weighing accuracy is the automatic scale of 1 gram, weighs 3 grams of cobalt oxides and adds it in the mixing machine of 6 tons and batch material (containing siliceous sand 3446Kg, soda ash 1116Kg, white cloud Stone 907Kg, limestone 284Kg, feldspar 197Kg, Glauber's salt 48Kg, carbon powder 2.6Kg) are mixed together evenly and then put into the melting furnace for normal melting, clarification, homogenization, cooling and molding, which can produce excellent performance and vision The main optical indicators of float transparent glass are shown in Table 2. Basic components of float glass: SiO ₂ 71-73%, R ₂ O 13-15%, CaO 8-10%, MgO 3-5%, Al ₂ O ₃ 0-2%, SO ₃ 0-0.5% and The impurity iron oxide is 0.06-0.09% and the impurity titanium oxide is 0-0.05%. Among them, R ₂ O is an oxide of a monovalent element, most of which are Na ₂ O and K ₂ O, mainly Na ₂ O.

Example 2

Apply known float glass production technology, by batching a dynamic weighing accuracy is the automatic scale of 1 gram, weighs cobalt oxide 5.5 grams and adds it in the mixing machine of 6 tons and batch material (containing siliceous sand 3446Kg, soda ash 1116Kg, white cloud Stone 907Kg, limestone 284Kg, feldspar 197Kg, Glauber's salt 48Kg, carbon powder 2.6Kg) are mixed together evenly and then put into the melting furnace for normal melting, clarification, homogenization, cooling and molding, which can produce excellent performance and vision The main optical indicators of float transparent glass are shown in Table 2.

Example 3

Apply known float glass production technology, by batching a dynamic weighing precision is the automatic scale of 1 gram, weigh 8 grams of cobalt oxide and add it in the mixing machine of 6 tons and batch material (containing siliceous sand 3446Kg, soda ash 1116Kg, white cloud Stone 907Kg, limestone 284Kg, feldspar 197Kg, Glauber's salt 48Kg, carbon powder 2.6Kg) are mixed together evenly and then put into the melting furnace for normal melting, clarification, homogenization, cooling and molding, which can produce excellent performance and vision The main optical indicators of float transparent glass are shown in Table 2.

Measure the glass that above-mentioned embodiment obtains by adopting conventional method in this field, its main optical index is shown in Table 2

Table II

It can be seen from Table 2 that the visible light transmittance of transparent glass to 5mm is higher than 89.0%, and the b ^* value is within 0.20, which provides high-quality (very easy to color) original transparent glass for the production of coated glass with high quality requirements .

The glass of the present invention can be used as automobile glass and high-grade building glass and the like.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, on the premise of not departing from the concept of the present invention, making specific changes or changes all belong to the protection scope of the present invention.

Claims (3)

1. a float glass process transparent glass comprises glass basic components and complementary color agent, it is characterized in that: said complementary color agent is a powder blue, and consumption is to be less than or equal to 0.0002% of glass total mass.

2. float glass process transparent glass according to claim 1 is characterized in that: said glass basic components contains SiO ₂71～73%, R ₂O 13～15%, CaO 8～10%, MgO 3～5%, Al ₂O ₃0～2%, SO ₃0～0.5% and oxidation of impurities iron 0.06～0.09% and oxidation of impurities titanium 0～0.05%, wherein R represents monad.

3. float glass process transparent glass according to claim 1 and 2 is characterized in that: the optical property of changeing 5mm glass is Tvis:89.5 ± 0.5%, a ^*:-1.15 ± 0.20, b ^*: 0.10 ± 0.10.