JPS61151037A - Ultraviolet-shielding coating glass composition - Google Patents

Abstract

PURPOSE:To provide an ultraviolet-shielding coating glass composition having low melting point and free from toxic substance, by adding TiO2, Fe2O3, Cr2O3, etc., to a matrix glass composition composed of SiO2, Al2O3, B2O3, F2, CaO, Na2O, etc. CONSTITUTION:The objective ultraviolet-shielding coating glass composition can be produced by adding one or more compounds selected from 0.05-10.0mol of TiO2, 0.10-6.0mol of Fe2O3, 0.03-6.0mol of Cr2O3, 0.03-6.0mol of CeO2 and 0.001-0.5mol of V2O5 to 100mol of a matrix glass composition composed of 10-24(mol)% SiO2, 24-30% Al2O3, 20-30% B2O3, 10-15% RO, 15-22% R2O and 5-15% F2 wherein RO is one or more compounds selected from CaO, ZnO, BaO, MgO and SrO, and R2O is one or more compounds selected from Li2O, Na2O, K2O and Cs2O.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention is a low-melting glass composition for coating glass plates, glass cloves, etc., which can be baked at low temperatures to block ultraviolet rays.

[Background technology]

Generally, UV-cutting glass has a glass composition of CeO□,
It contains TiO□, etc., and in order to cut ultraviolet rays, the glass plate or glass globe itself must be made of glass with such a composition, and ordinary glass plates 9,
It was not possible to add UV protection to glass gloves.

On the other hand, general glass for coating has a drawback that it is toxic because it contains lead, cadmium, etc. in order to have a low melting point, and it is difficult to dispose of it even though it is discarded during the manufacturing process.

In addition, as a phosphate glass, there is a low melting point glass for aluminum enamel, but the expansion coefficient is 23 × 10-'/'C.
This is a very high
．． When the paint is baked on Ox 10-'/"c), the paint film cracks and the strength of the glass plate decreases significantly. [Objective of the Invention] This invention was made in view of the above circumstances.
To provide a coated glass composition which enables ordinary glass products to have an ultraviolet cut function and which has a low melting point and does not contain toxic substances.

[Disclosure of the invention]

This invention provides a mother glass whose glass composition is: Sing: 10-24 mol% AlzOz: 24-30 mol% Bz(h: 4-35 mol% RO: 0-18 mol% RzO: 15-20 mol% Fz: 5-15 mol%) Ti0z: 0.05 for 100mol
~10.0molFe203: 0.10~6.0m
olCrt(h: 0.03-6.0molCeOz
: 0.03-6.0molVies : 0.
The gist of the invention is a coating glass composition for ultraviolet ray blocking, in which at least one of the following is added in an amount of 0.001 to 0.5 mol.

In other words, the UV-blocking coating glass composition constructed in this way can be fired at low temperatures for glass plates, glass globes, etc., is non-toxic and inexpensive, and has a low expansion coefficient as a phosphate-based glass, making it difficult to form coatings. It is a coating composition that does not cause cracking or decrease in the strength of the base material, and has a high effect of blocking ultraviolet rays.

Next, the reason why the composition is limited as described above in this invention will be explained.

S i O2 is an alkali resistance improving component, and when this amount is less than 10 mol%, alkali resistance deteriorates.
If it exceeds 1% of 24a+o, weather resistance may deteriorate depending on the balance with other components, and the softening temperature may become too high.

A11as is an acid resistance improving component, and this is 24
If it is less than mol %, acid resistance will not be sufficiently exhibited, and if it exceeds 30 mol %, it will be out of the vitrification range.

B20. is a softening temperature lowering component, and this is 20
If it is less than mol%, the softening temperature will not be sufficiently lowered and the
RO, which deteriorates chemical resistance when it exceeds ol%, is a component that lowers the softening temperature and also improves the coefficient of thermal expansion. This one is 10m.

If it is less than 1%, the softening temperature will be too high, and 15 mol
%, the coefficient of thermal expansion becomes too large, making it impossible to obtain the desired glass composition.

RzO is a component that lowers the softening temperature and also a component that increases the coefficient of thermal expansion. When this amount is less than 15 mol%, the softening temperature becomes too high, and when it exceeds 22 mol%, the coefficient of thermal expansion becomes too large, making it impossible to obtain the desired glass composition.

F2 is a softening temperature lowering component and exhibits a remarkable effect at 5 mol%. However, even if it exceeds 15 mol %, the degree of improvement in the effect is small and the acid resistance deteriorates on the contrary.

In this invention, some of the oxides may be replaced with fluorides. That is, oxygen may be replaced with fluorine. The amount of F2 mentioned above is calculated by converting the amount of fluoride into the amount of F.

Ti 021Fez C)++Crz 03. Ce0z
, Vz O3 are ultraviolet absorbing components, and the above effects are not exhibited below the lower limit of the composition range. TiO2+F
If ez Oi+ Cr z Ch, Vz Os exceeds the upper limit of the composition range, the glass composition will be colored.

Further, even if CeO exceeds the upper limit of the composition range, no coloring occurs, but the degree of improvement in the above effects is small.

Next, the raw materials for the coating glass composition of the present invention will be explained. The raw materials for the components constituting the glass composition of the present invention may be any materials as long as they produce oxides, fluorides, or mixtures thereof of the components when fired. For example, sodium carbonate, sodium chloride, sodium fluoride, calcium carbonate, calcium fluoride, silica, lithium carbonate, lithium fluoride.

Cesium carbonate, cesium nitrate, potassium carbonate, barium carbonate, strontium carbonate, magnesium carbonate, zinc white, titanium oxide, triferric oxide, chromic oxide, cerium oxide, vanadium pentoxide, boric acid, aluminum hydroxide, etc. It will be done.

In addition, when coating a glass plate, a glass globe, etc. with the composition of this invention, the coating glass composition powder is dispersed in an appropriate solvent (for example, screen oil, turpentine oil mixture), and the coating is applied by spraying or dipping. Alternatively, apply the powder using electrostatic powder coating or fluidized dipping and bake.

Next, examples will be described.

Ten types of samples were prepared and measured.

The composition and physical properties of each coated glass are
It is shown in Table 2.

(Margin below) The method for measuring the physical properties of the glass composition is as follows.

(1) Coefficient of thermal expansion and softening temperature A rod-shaped glass composition with a diameter of about 3 mm was used as a sample, and the heating rate was 5°C.
/min. The softening temperature was read from the recording paper as the point at which the glass changes from expansion to contraction due to deformation.

(2) Adjust the particle size of the boiling-reduced glass composition to 32 to 60 mesh.
Accurately weigh out 1 g, put it into a 300 cc eggplant flask with 59 cc of hot water, and boil for 60 minutes while refluxing. The boiled sample was filtered through a No. 103 glass filter, and the weight before and after boiling was measured to determine the weight loss due to boiling, which was expressed as a percentage of the weight before boiling.

(3) Accurate weight loss 2g of glass composition powder with a particle size of 32 to 60 mesh was precisely weighed, placed in a 10cc beaker, stirred with 50cc of 5% citric acid aqueous solution at room temperature using a stirrer for 15 minutes, and then IGI The acid resistance loss was calculated by suction filtration with a glass filter and weighing the residue.

(4) Alkali resistance weight loss: Precisely weigh 2g of glass composition powder with a uniform particle size of 32 to 60 mesh, place it in a 100 cc beaker, and place it in a 100 cc beaker.
- With 50 cc of NaOH aqueous solution and a Nysterler,
After stirring at room temperature for 15 minutes, the mixture was suction filtered through an IG1 glass filter and the residue was weighed to calculate the alkali resistance loss.

(5) Ultraviolet blocking effect coating The glass composition is crushed to a mesh size of 350 or less, mixed with turpentine oil and screen oil to form a paint, and this is applied to a slide glass with a spray gun to a film thickness of 30 μm, and baked at 600°C. and used it as a sample.

For this sample, 300-800
The transmittance was measured down to nm. Point A was determined from the chart as shown in FIG. 1, and the wavelength at point A was taken as a representative value of the ultraviolet blocking effect. In the example shown, the UV blocking effect is 420 (nm).
becomes.

〔Effect of the invention〕

As described above, the coating glass composition according to the present invention can provide ordinary glass products with ultraviolet blocking performance, and can be baked at low temperatures without using toxic substances such as lead. can.

[Brief explanation of drawings]

FIG. 1 is a graph showing a chart in transmittance measurement. Agent: Takehiko Matsumoto, Patent Attorney (nm) Procedural Amendment (October 19, 1985 Patent Application No. 271528 2, Title of Invention: Ultraviolet blocking coating glass composition 3, Person making the amendment 1 Relationship with Kagyu Patent applicant address 1048 Oaza Kadoma, Kadoma City, Osaka Name (583) Representative of Matsushita Electric Works Co., Ltd. (Kaisato Shinryo Fujii Sadao 4, Agent 6, Subject of amendment Description 7, Contents of amendment (1) The entire text of the scope of claims column of the specification is corrected as shown in the attached sheet. [Full text of the scope of claims column after amendment] 2. Scope of claims fll The composition is 5i (h: 10-24 mol% ^h(h: 24-30 mol% 8203: 20-30 mol% RO: 10-15 mol% R20: 15-22 mol% Fz: 5-15 mol% Ti0z
: 0.05-10.0mol Fetus : 0.1
0-6.0 molCrz (h: 0.03-6.0
molCeOz: 0.03-6.0 molV
A coating glass composition for blocking ultraviolet rays to which at least one of zOs: 0.001 to 0.5 mol is added.

Claims (1)

[Claims] (1) The compositions are: SiO_2: 10-24 mol% Al_2O_3: 24-30 mol% B_2O_3: 20-30 mol% RO: 10-15 mol% R_2O: 15-22 mol% F_2: 5-15 mol% [However, RO is CaO, ZnO , BaO, MgO and SrO, R_2O is Li_2O, Na_2O, K_2O and C
Consisting of at least one of s_2O. ] For 100 mol of mother glass consisting of: TiO_2: 0.05-10.0 mol FeO_3: 0.10-6.0 mol Cr_2O_3: 0.03-6.0 mol CeO_2: 0.03-6.0 mol V_2O_5: 0. A coating glass composition for blocking ultraviolet rays, to which at least one of 0.001 to 0.5 mol is added.