阅读说明：本技术 一种硼硅酸盐玻璃及其制备方法 (Borosilicate glass and preparation method thereof ) 是由 彭寿 柯震坤 张冲 曹欣 郝志云 倪嘉 石丽芬 于 2021-10-29 设计创作，主要内容包括：本申请提供了一种硼硅酸盐玻璃及其制备方法,其中,基于所述硼硅酸盐玻璃的总重量,所述硼硅酸盐玻璃包括：SiO-(2)75-85wt％,B-(2)O-(3)8-15wt％,Na-(2)O 4-7wt％,K-(2)O 1-3wt％,NaCl 0.8-1.2wt％,Fe-(2)O-(3)<5ppm。采用本申请硼硅酸盐玻璃的制备方法,获得本申请的硼硅酸盐玻璃,具有紫外透过率高、澄清效果优异、制备工艺简单、对环境友好等优势。(The present application provides a borosilicate glass and a method for producing the same, wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2 2 75‑85wt％，B 2 O 3 8‑15wt％，Na 2 O 4‑7wt％，K 2 O 1‑3wt％，NaCl 0.8‑1.2wt％，Fe 2 O 3 <5 ppm. By adopting the preparation method of the borosilicate glass, the borosilicate glass obtained by the preparation method has the advantages of high ultraviolet transmittance, excellent clarification effect, simple preparation process, environmental friendliness and the like.)

1. A borosilicate glass, wherein said borosilicate glass comprises, based on the total weight of said borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5ppm。

2. The borosilicate glass according to claim 1, wherein said borosilicate glass has a transmittance T ≥ 90% in the ultraviolet band of 300-400 nm.

3. A method of making the borosilicate glass of claim 1 or claim 2, comprising the steps of:

(1) weighing raw materials, mixing, adding into a granulating device for granulation, screening the obtained granules according to particle size, and drying;

(2) melting the dried particles, pouring the melted particles into a mold for molding to obtain glass blocks, and annealing to obtain borosilicate glass;

wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5ppm。

4. The method according to claim 3, wherein the granules obtained by the step (1) have a particle size of 1.5 to 2.5mm after passing through the particle size screening.

5. The preparation method as claimed in claim 3, wherein the melting in step (2) comprises heating to 1600-1650 ℃ and keeping the temperature for 2-4 h.

6. The method as claimed in claim 3, wherein the annealing of step (2) comprises subjecting the glass block to a temperature of 500-550 ℃ and then cooling to room temperature.

7. The production method according to claim 3, wherein the raw material includes SiO₂、H₃BO₃、Na₂CO₃、K₂CO₃NaCl; the SiO₂Has a particle diameter of 180-220 mu m, H₃BO₃Has a particle diameter of 90-110 μm and Na₂CO₃Has a particle diameter of 110-₂CO₃The particle size of (A) is 110-130 μm, and the particle size of NaCl is 90-110 μm.

8. The preparation method according to any one of claims 3 to 7, wherein the borosilicate glass has a transmittance T ≥ 90% in the ultraviolet band of 300-400 nm.

Technical Field

The application relates to the technical field of glass, in particular to borosilicate glass and a preparation method thereof.

Background

When the ultraviolet light interacts with substances, the ultraviolet light shows the characteristics of fluorescence effect, biological effect, photochemical effect and the like, so that the ultraviolet light has wide application in the aspects of environmental remote measurement, the medical field, the spectroscopy field and the like, and people hope to develop an optical material with better performance and higher transmission in an ultraviolet band. Most colorless optical glass has high transmittance in a visible light waveband, but has different degrees of absorption in an ultraviolet waveband, so that only a few glasses with special components have good ultraviolet transmittance.

The quartz glass is one of the most common ultraviolet transmission materials, but the preparation conditions of the quartz glass are harsh, the production cost is high, the application of the quartz glass is limited to a great extent, and the mass production of large-area quartz glass cannot be realized at present in China. Therefore, researchers at home and abroad carry out research on the ultraviolet light-absorbing material to meet the requirements of the application of the ultraviolet technology on the material. In recent years, researchers carry out systematic research on fluoride and phosphate ultraviolet high-transmittance glass, the fluoride glass is characterized in that the components have large-range adjustability, and the formula of the fluoride glass can be adjusted in a large range according to different requirements, so that a series of adjustability of optical properties and physical properties is brought, and the fluoride glass is more widely and flexibly applied, but the fluoride and the chloride in the glass can cause a certain degree of erosion effect on a melting furnace in the high-temperature melting process of the glass, and cause certain potential safety hazards on production and environment; and the phosphate ultraviolet high-transmittance glass contains P₂O₅And the glass has poor water chemical resistance stability and low strength due to unstable components.

Disclosure of Invention

The application aims to provide borosilicate glass and a preparation method thereof so as to obtain the borosilicate glass with higher ultraviolet transmittance. The specific technical scheme is as follows:

a first aspect of the present application provides a borosilicate glass, whereinA borosilicate glass comprising, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5ppm。

A second aspect of the present application provides a method of making a borosilicate glass provided according to the first aspect of the present application, comprising the steps of:

(1) weighing raw materials, mixing, adding into a granulating device for granulation, screening the obtained granules according to particle size, and drying;

(2) melting the dried particles, pouring the melted particles into a mold for molding to obtain glass blocks, and annealing to obtain borosilicate glass;

wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5ppm。

The present application provides a borosilicate glass and a method for producing the same, wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5 ppm. By adopting the preparation method of the borosilicate glass, the borosilicate glass obtained by the preparation method has the advantages of high ultraviolet transmittance, excellent clarification effect, simple preparation process, environmental friendliness and the like.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.

This applicationThe first aspect of (a) provides a borosilicate glass, wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5ppm。

In some embodiments of the first aspect of the present application, the borosilicate glass has a transmittance T.gtoreq.90% in the ultraviolet band of 300-400 nm.

A second aspect of the present application provides a method of making a borosilicate glass provided according to the first aspect of the present application, comprising the steps of:

(1) weighing raw materials, mixing, adding into a granulating device for granulation, screening the obtained granules according to particle size, and drying;

(2) melting the dried particles, pouring the melted particles into a mold for molding to obtain glass blocks, and annealing to obtain borosilicate glass;

wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5ppm。

In the application, the mixing in the step (1) is uniform mixing, and the mixing mode is not limited as long as the purpose of the application can be achieved; the granulating device can granulate in an extrusion granulating manner to obtain granules; the drying is not limited in the present application as long as the purpose of the present application can be achieved, and for example, drying may be performed by using an oven drying method. In the step (2), the borosilicate glass is obtained after annealing, and can be cut, ground and polished according to the need, which is not limited in the application, and the skilled person can perform corresponding treatment according to the need.

In the application, the preparation process of the borosilicate glass is simple, and the borosilicate glass does not contain alumina, alkaline earth metal and other raw materials with high iron content, so that the phenomenon of high iron content in the borosilicate glass is avoided on the premise of ensuring low high-temperature viscosity of the borosilicate glass, thereby ensuring high transmittance of the borosilicate glass in an ultraviolet band and improving the ultraviolet transmittance of the borosilicate glass; the borosilicate glass is prepared into particles with a certain particle size after the raw materials are uniformly mixed in the step (1), and the particles are mixed and melted into the glass again when being melted in the step (2), so that the raw materials are mixed twice, the uniformity of the borosilicate glass is greatly improved, the clarification effect of the glass is further improved, and the optical performance of the borosilicate glass is improved; by adopting the preparation method of the borosilicate glass, the borosilicate glass obtained by the preparation method has the advantages of high ultraviolet transmittance, excellent clarification effect, simple preparation process, environmental friendliness and the like.

In some embodiments of the second aspect of the present application, wherein the granules obtained in step (1) have a particle size of 1.5 to 2.5mm after passing the particle size screen. In the research of the inventor, the inventor of the present application finds that when the particle size of the particles is too small, the strength of the prepared particles is not enough, which results in low yield of the particles; when the particle size of the particles is too large, the raw materials are not easy to decompose, the melting time is longer, and the energy consumption is greatly improved. According to the preparation method, the particle size of the particles is controlled within the range, the borosilicate glass with high yield and high production efficiency can be obtained, and the preparation method has the advantages of high ultraviolet transmittance, excellent clarification effect, simple preparation process, environmental friendliness and the like.

In some embodiments of the second aspect of the present application, wherein the melting in step (2) comprises heating to 1600-. The melting method is not limited in the present application as long as the object of the present application can be achieved, and, for example, melting by heating in a melting furnace may be employed.

In some embodiments of the second aspect of the present application, wherein the annealing of step (2) comprises subjecting the glass block to a temperature of 500-; the cooling method is not particularly limited in the present application as long as the purpose of the present application can be achieved, and illustratively, the glass block is placed in an annealing furnace, the temperature of the annealing furnace is 500-; the glass is annealed, so that the hardness can be reduced, the residual stress is eliminated, the size is stabilized, the deformation and crack tendency is reduced, and the glass structure is more stable.

In the present application, there is no particular limitation on the kind of the borosilicate glass raw material as long as the object of the present application can be achieved, for example, in some embodiments of the second aspect of the present application, the raw material includes SiO₂、H₃BO₃、Na₂CO₃、K₂CO₃NaCl; wherein the SiO₂Has a particle diameter of 180-220 mu m, H₃BO₃Has a particle diameter of 90-110 μm and Na₂CO₃Has a particle diameter of 110-₂CO₃The particle size of (A) is 110-130 μm, and the particle size of NaCl is 90-110 μm. In the present application, the impurities of the raw material contain less than 5ppm of iron; the application of borosilicate glass adopts the raw materials that do not contain iron content such as alumina, alkaline earth metal and so on to avoid the higher phenomenon of iron content in the borosilicate glass who makes, thereby guarantee borosilicate glass at the high transmissivity of ultraviolet band.

In some embodiments of the second aspect of the present application, the borosilicate glass has a transmittance T.gtoreq.90% in the ultraviolet band of 300-400 nm.

In the present application, the particle sizes are all Dv50, which represents a particle size with a cumulative particle distribution of 50%; i.e. the volume content of particles smaller than this size is 50% of the total particles. The particle size is measured with a laser particle sizer.

The embodiments of the present application will be described in more detail below with reference to examples.

Example 1

(1) Based on the total weight of the raw materials, weighing the oxide composition into SiO₂ 79wt％，B₂O₃ 12.5wt％，Na₂O 5.5wt％，K₂SiO 2 wt% and NaCl 1 wt% as raw material₂、H₃BO₃、Na₂CO₃、K₂CO₃NaCl is mixed, and is put into the granulating device after being uniformly mixedGranulating, screening the obtained particles to obtain particles with the particle size of 2mm, and drying; wherein the particle sizes of the raw materials are respectively as follows: SiO 2₂ 200μm，H₃BO₃ 100μm，Na₂CO₃ 120μm，K₂CO₃120μm，NaCl 100μm；

(2) Putting the dried particles into a melting furnace for melting, heating the particles to 1630 ℃ in a high-temperature furnace body, and preserving the temperature for 3 hours; and after melting, pouring the molten glass into a mold for molding to obtain a glass block, placing the glass block into an annealing furnace for annealing, wherein the temperature of the annealing furnace is 520 ℃, then closing the annealing furnace, naturally cooling the glass block to room temperature along with the annealing furnace, and cutting and polishing after annealing to obtain the borosilicate glass.

Examples 2 to 3

The steps for preparing borosilicate glasses were the same as in example 1, and the relevant preparation parameters were varied as shown in Table 1.

The borosilicate glasses of examples 1 to 3 were tested using the following performance test methods, and the results are shown in table 1.

And (3) performance testing:

average transmittance T in ultraviolet wavelength band 300-400 nm: the transmittance of 30X 1mm polished glass samples in the wavelength range of 300-400nm was measured using a UV-VIS-NIR spectrophotometer at room temperature.

Melting temperature (Tm) and operating temperature (Tw, also known as working temperature) tests: adding about 300 g of glass material into a Pt crucible by using a high-temperature rotary viscometer, measuring the viscosity of the glass by a rotary method at the temperature range of 1100-1550 ℃ to obtain a curve of the viscosity and the temperature, and obtaining Tm (10Pa s) and Tw (10Pa s) according to the curve³Pa·s)。

And (3) clarification effect test: the number of bubbles in a unit volume in the glass was measured by an optical microscope to compare the clarification effect of the glass samples.

TABLE 1

Through tests, the borosilicate glass has the average transmittance T of more than 90 percent in the ultraviolet band of 300-400nm, higher ultraviolet transmittance and better clarification effect.

In summary, the present application provides a borosilicate glass and a method for preparing the same, wherein the borosilicate glass comprises, based on the total weight of the borosilicate glass: SiO 2₂ 75-85wt％，B₂O₃ 8-15wt％，Na₂O 4-7wt％，K₂O 1-3wt％，NaCl 0.8-1.2wt％，Fe₂O₃<5 ppm. By adopting the preparation method of the borosilicate glass, the borosilicate glass obtained by the preparation method has the advantages of high ultraviolet transmittance, excellent clarification effect, simple preparation process, environmental friendliness and the like.

The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.