JP4863165B2 - Glass block - Google Patents

Description

  The present invention relates to a glass block used as a building material.

  A glass block is a glass molded body having a hollow box shape, and is excellent in heat insulation, sound insulation, and translucency.

In recent years, non-transparent glass blocks have come to be used in terms of soft incident light, reflected light, and privacy protection. For example, Patent Document 1 discloses a hollow glass block made of semi-translucent milky white glass having high light diffusibility, no glare against direct sunlight, and appropriate translucency. . This milk white glass is a glass in which fine crystal particles or phase separation particles are precipitated in a glass matrix, and the light incident on this glass is scattered at the interface of the fine particles, and the glass exhibits a milky white color. The light incident on the glass from one side travels straight in the transparent glass as it is, but in the milky glass, the traveling direction is variously changed due to scattering, and diffuses in all directions when exiting from the glass. The same effect can be achieved by engraving a fine pattern on the inner surface of the glass block, but the fine particles in the milky white glass are much finer than the pitch of the pattern, so that soft light without glare can be obtained. . In addition, the glass block has a non-hollow edge called a picture frame, and in transparent glass, light is directly incident / transmitted from this part, causing glare, but when using milky glass, the picture frame is The transmitted light is also scattered by the fine particles and no glare occurs. Thus, there is a disclosure that a glass block using milky glass is excellent in light diffusibility and enables uniform daylighting.
JP-A-63-312450

  By the way, in recent years, building materials having various appearances have been developed along with the diversification of architecture, and the glass block is not a glass block made of the above-described conventional milky glass but has a high whiteness and a high-class appearance. Things are required.

  In view of the above circumstances, an object of the present invention is to provide a glass block made of milky white glass having a higher whiteness and a higher quality than before.

Glass blocks according to the present invention in order to achieve the above object, 20 to 80% average visible light transmittance at a wavelength 400~700nm is when the thickness was 10 mm, the standard light D ₆₅ 10 ° field of view Semi-translucency with whiteness L * value of L * a * b * color system chromaticity of the design surface according to measurement conditions being 65.5 or more and a * value and b * value being within ± 1.0 It is made of a milky white glass.

  In the glass block of the present invention, when the whiteness L * value is less than 65.5, or when the color coordinate a * value and b * value deviate from ± 1.0, coloring occurs and the color tone of the conventional product Almost no difference. In addition, when the color coordinate a * value and b * value are within ± 0.8, not only the color tone but also the visual difference in hue from the conventional product can be clearly felt, which is suitable as an achromatic white product. It is more preferable because of a good color tone. The L * a * b * color system chromaticity means that defined in JIS Z 8730.

  In addition, when the average visible light transmittance exceeds 80% in the glass block of the present invention, the light diffusibility is weakened, causing glare or problems in privacy protection. On the other hand, if the average visible light transmittance is less than 20%, the amount of light transmitted through the glass block is reduced, and the lighting performance is impaired. It is important that the glass block of the present invention is translucent with an average visible light transmittance of 20 to 80%.

  Furthermore, the glass block of the present invention is characterized in that the x value in the XYZ color system chromaticity diagram of the design surface is 0.3140 to 0.3170 and the y value is 0.3310 to 0.3340.

  When the x value in the XYZ color system chromaticity diagram of the design surface is 0.3140 to 0.3170 and the y value is 0.3310 to 0.3340, in addition to the difference in color tone from the conventional product, Since the difference is also clearly felt, it is more preferable. The glass block having such XYZ color system chromaticity has a color tone suitable as a new achromatic white product which has not been conventionally obtained. The XYZ color system chromaticity means that defined in JIS Z 8701.

The glass block of the present invention is characterized in that the milky white glass has a Cr ₂ O ₃ content of 6.5 ppm or less in terms of oxide.

When the content of Cr ₂ O ₃ expressed in terms of oxide in milk white glass exceeds 6.5 ppm, a milky white glass block with a low whiteness equal to or lower than that of the conventional product is obtained. In the glass block of the present invention, by selecting the glass raw material, the content of Cr ₂ O ₃ in the milky white glass is controlled to 6.5 ppm or less, whereby fine crystal particles precipitated in the glass matrix, or minute The color coordinates a * and b * values in the L * a * b * color system chromaticity of the milky glass surface due to the phase particles and the transparent glass part are in a different range from the conventional glass block made of milky glass, and the conventional It can be a milky white glass block having a whiteness L * value higher than that of the product.

  In addition, the glass block of the present invention is characterized in that the milky white glass has crystal particles or phase-separated particles precipitated in a glass matrix.

In the present invention, by employing milky glass in which crystal particles or phase-separated particles are precipitated in a glass matrix, fine fine particles that scatter incident light can be uniformly precipitated and distributed in the glass block. . Crystalline glass such as SiO ₂ —Al ₂ O ₃ —B ₂ O ₃ —Na ₂ O is suitable as the milky white glass in which fine crystal particles or phase separation particles are precipitated in the glass matrix.

  In addition, as a form of the glass block of the present invention, a pair of glass molded bodies having a bottomed and uncovered box shape whose bottom surface is a translucent surface are welded and integrated with each other at open edges. A glass block is preferable for construction because of its light weight and high heat insulation and translucency, and a glass molded body or brick shape having a bottomed and uncovered box shape whose bottom surface is a translucent surface is also possible.

According to the glass block of the present invention, when the wall thickness is 10 mm, the average visible light transmittance at a wavelength of 400 to 700 nm is 20 to 80%, and the design surface according to the measurement condition of the 10-degree field of view with the standard light D ₆₅ is used. Since the whiteness L * value in the L * a * b * color system chromaticity is 65.5 or more and the a * value and the b * value are within ± 1.0, it is made of semi-translucent milky white glass. Thus, it is possible to provide a glass block made of milky white glass having higher whiteness and higher quality than conventional ones.

  Moreover, since the x value in the XYZ color system chromaticity diagram of the design surface is 0.3140 to 0.3170 and the y value is 0.3310 to 0.3340, the glass block of the present invention has a new and unprecedented value. A glass block made of milky white glass having a high degree of whiteness suitable for an achromatic white product can be provided.

Furthermore, since the glass block of the present invention has a milk white glass with a content of Cr ₂ O _{3 in} oxide conversion display of 6.5 ppm or less, a glass block made of milk white glass having a higher whiteness than conventional glass blocks can be stably provided. Obtainable.

  Below, the glass block which consists of milky-white glass of this invention using an Example is demonstrated in detail.

  FIG. 1 is an explanatory view of a glass block 1 made of milky glass according to an embodiment of the present invention. In the figure, 1a represents a hollow body, 1b represents a design surface, and 1c represents a frame.

The glass block 1 made of milky white glass of the example is SiO ₂ 66%, Al ₂ O ₃ 8.6%, B ₂ O ₃ 2.5%, BaO 1.6% in terms of mass percentage in terms of oxide. It has a glass composition of 2.4% ZnO, 18.1% Na ₂ O, 0.4% SO _{3 and} 0.4% Fe ₂ O, and removes chromite from natural silica sand as a glass raw material by a magnetic separation steel method. By using the silica sand, the content of Cr ₂ O _{3 in} terms of oxide as an impurity is 2 ppm, which is 6.5 ppm or less, and the milky white glass in which sodium sulfate crystals and sodium sulfide crystals are precipitated as the main crystals during molding is used. Then, a bottomed and uncovered glass molded body is obtained by press molding using a mold. The glass block 1 was manufactured by forming the hollow body 1a having dimensions of 145 mm × 145 mm × 95 mm by fusing the openings of the pair of glass molded bodies with a burner. The average visible light transmittance of the glass block 1 was 60% at a wavelength of 400 to 700 nm when the glass thickness t was 10 mm. Further, the L * value of the L * a * b * color system chromaticity of the design surface 1b under the measurement condition of the 10 ° field of view with the standard light D ₆₅ of the glass block 10 is 68.0, and the color coordinate a * value is −0 .13, b * value was 0.55. Further, the x value in the XYZ color system chromaticity diagram of the design surface 1b is 0.3155 and the y value is 0.3329.

As a comparative example, a conventional glass block having dimensions of 145 mm × 145 mm × 95 mm was produced using milky glass having a content of Cr ₂ O ₃ as an impurity of 8 ppm. The glass block of the comparative example had an average visible light transmittance of 55% at a wavelength of 400 to 700 nm when the glass thickness was 10 mm. The L * value of the L * a * b * color system chromaticity of the design surface of the glass block was 63.2, the color coordinate a * value was −1.02, and the b * value was 0.40. Furthermore, in the XYZ color system chromaticity diagram of the design surface, the x value was 0.3125 and the y value was 0.3320, and a greenish milky white color was exhibited.

  Thus, the glass block 10 made of the milky white glass of the example has a whiteness L * value of 68.0 of 65.5 or more, which is 4.8 higher than the conventional product, compared to the conventional milky glass block, and The a * value and the b * value are within ± 1.0. The a * value is -0.13 and the b * value is 0.55, which is an excellent value. .

  The average visible light transmittance in the wavelength range of 400 to 700 nm was measured with a spectrophotometer (UV2500PC manufactured by Shimadzu Corporation) by preparing an optically polished 20 × 20 × 10 mm sample. Further, the whiteness L * value, a * value, and b * value of the glass block were obtained with a colorimeter (JP7200F, manufactured by JUKI Corporation), and at the same time, the x value and the y value in the XYZ color system chromaticity were obtained.

  The technology of the present invention can be applied not only to glass blocks but also to wall materials, floor materials, and the like.

It is explanatory drawing of the Example which concerns on this invention, Comprising: (A) is a perspective view, (B) is a side view.

Explanation of symbols

1 glass block 1a hollow body 1b design surface 1c frame

Claims (2)

Average visible light at a wavelength of 400 to 700 nm when the content of Cr ₂ O _{3 in} oxide conversion is 6.5 ppm or less, crystal particles or phase- separated particles are precipitated in the glass matrix, and the thickness is 10 mm. The transmittance is 20 to 80%, the whiteness L * value in the L * a * b * color system chromaticity of the design surface according to the measurement condition of the 10-degree field of view with the standard light D ₆₅ is 65.5 or more, and in a * and b * values are Ri der within ± 1.0, x values in the XYZ color system chromaticity diagram of the design surface from 0.3140 to 0.3170 and y values from 0.3310 to 0.3340 glass block, characterized in that it consists Oh Ru semitransparent milk white glass. The glass block according to claim 1, wherein the milk white glass is made of SiO ₂ —Al ₂ O ₃ —B ₂ O ₃ —Na ₂ O glass.

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