阅读说明：本技术 一种中硼硅玻璃组合物、中硼硅玻璃及其制备方法和应用 (Medium borosilicate glass composition, medium borosilicate glass, and preparation method and application thereof ) 是由 李青 李赫然 李刚 胡恒广 史伟华 闫冬成 王博 安利营 于 2021-01-04 设计创作，主要内容包括：本公开涉及一种中硼硅玻璃组合物,其特征在于,所述组合物含有B-2O-3、SiO-2、Al-2O-3、ZnO、碱金属氧化物、碱土金属氧化物和La-2O-3；以组合物的总重量为基准,所述中硼硅玻璃组合物中,B-2O-3、SiO-2和Al-2O-3的总含量为88-92.5重量％,碱金属氧化物的总含量为6-9重量％；ZnO和碱土金属氧化物的总含量为0.9-3.7重量％；ZnO的含量与ZnO和碱土金属氧化物的总含量之和的比值为0-0.45；La-2O-3的含量与ZnO和碱土金属氧化物的总含量之和的比值为0-0.5。由该玻璃组合物制备的中硼硅玻璃具有良好的耐水、耐酸和耐碱侵蚀性能以及优越的光学性能。利用本公开所提供的技术方案可以减少中硼硅玻璃生产中经常出现的结石、线道、气泡等缺陷,产品具有较高的良品率。(The disclosure relates to a medium borosilicate glass composition, which is characterized by containing B 2 O 3 、SiO 2 、Al 2 O 3 ZnO, alkali metal oxide, alkaline earth metal oxide and La 2 O 3 (ii) a In the medium borosilicate glass composition, B is based on the total weight of the composition 2 O 3 、SiO 2 And Al 2 O 3 The total content of (A) is 88-92.5 wt%, and the total content of alkali metal oxides is 6-9 wt%; the total content of ZnO and alkaline earth metal oxide is 0.9-3.7 wt%; the ratio of the content of ZnO to the sum of the total content of ZnO and alkaline earth metal oxide is 0-0.45; la 2 O 3 The ratio of the content of (A) to the sum of the total content of ZnO and alkaline earth metal oxide is 0 to 0.5. The medium borosilicate glass prepared by the glass composition has good water resistance, acid resistance and alkali corrosion resistance and excellent performanceThe optical properties of (1). The technical scheme provided by the disclosure can reduce the defects of stones, lines, bubbles and the like frequently occurring in the production of the medium borosilicate glass, and the product has higher yield.)

1. A medium borosilicate glass composition, characterized in that said composition contains B₂O₃、SiO₂、Al₂O₃ZnO, alkali metal oxide, alkaline earth metal oxide and La₂O₃；

In the medium borosilicate glass composition, B is based on the total weight of the composition₂O₃、SiO₂And Al₂O₃The total content of (A) is 88-92.5 wt%, and the total content of alkali metal oxides is 6-9 wt%; the total content of ZnO and alkaline earth metal oxide is 0.9-3.7 wt%; the ratio of the content of ZnO to the sum of the total content of ZnO and alkaline earth metal oxide is 0-0.45; la₂O₃The ratio of the content of (A) to the sum of the total content of ZnO and alkaline earth metal oxide is 0 to 0.5.

2. The medium borosilicate glass composition of claim 1 wherein the La comprises, based on the total weight of the composition₂O₃The content is 0-0.5 wt%.

3. The medium borosilicate glass composition of claim 1, wherein the alkali metal oxide is selected from Na₂O、Li₂O and K₂Any one or more of O.

4. The medium borosilicate glass composition according to claim 1, wherein the alkaline earth oxide is selected from any one or more of CaO, SrO, BaO, and MgO.

5. The boron intermediate of claim 1A silica glass composition, wherein the composition further comprises a material selected from the group consisting of CeO₂And one or more of alkali metal sulfates, alkaline earth metal sulfates, and halides.

6. The medium borosilicate glass composition according to claim 5, wherein the fining agent comprises CeO₂Based on the total weight of the composition, CeO₂The content of (B) is 0.01-0.5 wt%.

7. The medium borosilicate glass composition according to claim 1 or 6, wherein the medium borosilicate glass composition comprises 69 to 76 wt% of SiO, based on the total weight of the composition₂4-8% by weight of Al₂O₃8-12% by weight of B₂O₃3.9-9 wt% of Na₂O, 0-0.5 wt% Li₂O, 0-9% by weight of K₂O, 0-0.3 wt% MgO, 0.5-3 wt% CaO, 0-0.5 wt% SrO, 0-1.5 wt% BaO, 0-0.5 wt% ZnO, 0.01-0.5 wt% La₂O₃0 to 0.5% by weight of CeO₂。

8. A method for preparing a medium borosilicate glass, which comprises subjecting the glass composition as defined in any one of claims 1 to 7 to melting, refining, shaping, annealing and machining treatments in this order, wherein the temperature of the melting treatment is 1550-.

9. The medium borosilicate glass produced by the medium borosilicate glass production method according to claim 8.

10. Use of a medium borosilicate glass composition according to any one of claims 1 to 7 or a medium borosilicate glass according to claim 9 for the production of a medical medium borosilicate glass article.

Technical Field

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

Background

Medium borosilicate glass, also known as neutral borosilicate glass, is increasingly used in the production of medical packaging materials because of its advantages of small coefficient of expansion, high mechanical strength, and good chemical stability. At present, the medical glass packaging material produced in China mainly takes low-boron glass and soda-lime-silica glass as main materials, only a small amount of medium borosilicate medical glass exists, and domestic products have certain difference with the same type of products abroad in the aspects of quality stability and water resistance, so that the domestic medical medium borosilicate glass products mainly depend on import at present. Due to the limited production capacity of borosilicate medical glass in the world and the continuous increase of the demand of borosilicate glass bottles for vaccine packaging, the domestic borosilicate glass products are seriously insufficient.

Compared with low-boron glass, the boron content in the medium borosilicate glass is higher, and the boron has large corrosion loss to a kiln and related materials, so that a material channel stirrer, a rotating pipe and the like need to be coated with platinum-rhodium alloy for protection in the production process, and the production cost is increased. In addition, the domestic production of the medium borosilicate glass often has the defects of stones, lines, bubbles and the like, the qualification rate of the finished product is low, and the requirements of medical packing materials cannot be met.

Therefore, there is a need for a new medium borosilicate glass and a method for making the same.

Disclosure of Invention

The invention aims to provide a medium borosilicate glass composition, medium borosilicate glass, and a preparation method and application thereof. The medium borosilicate glass has good water resistance, acid resistance and alkali corrosion resistance and excellent optical performance. The technical scheme provided by the disclosure can reduce the defects of stones, lines, bubbles and the like frequently occurring in the production of the medium borosilicate glass, and the product has higher yield.

In order to achieve the above objects, one aspect of the present disclosure provides a medium borosilicate glass composition, wherein the composition contains B₂O₃、SiO₂、Al₂O₃ZnO, alkali metal oxide, alkaline earth metal oxide and La₂O₃；

In the medium borosilicate glass composition, B is based on the total weight of the composition₂O₃、SiO₂And Al₂O₃The total content of (A) is 88-92.5 wt%, and the total content of alkali metal oxides is 6-9 wt%; the total content of ZnO and alkaline earth metal oxide is 0.9-3.7 wt%; the ratio of the content of ZnO to the sum of the total content of ZnO and alkaline earth metal oxide is 0-0.45; la₂O₃The ratio of the content of (A) to the sum of the total content of ZnO and alkaline earth metal oxide is 0 to 0.5.

A second aspect of the present disclosure provides a method for preparing a medium borosilicate glass, wherein the method comprises sequentially subjecting the glass composition of the present disclosure to melting, fining, forming, annealing, and machining, wherein the temperature of the melting is 1550-.

A third aspect of the present disclosure provides a medium borosilicate glass produced by the method of the second aspect.

The fourth aspect of the present disclosure provides the use of the borosilicate glass composition or the borosilicate glass in the preparation of a borosilicate glass article for medical use.

The medium borosilicate glass obtained by the composition and the preparation method provided by the disclosure has good water, acid and alkali corrosion resistance, the operation temperature in the preparation process is low, the melting difficulty in glass production is reduced, the service life of a kiln can be prolonged, the softening point is less than 800 ℃, the medium borosilicate glass is favorably prepared into a medical packaging bottle, the yield of the product is high, the refractive index is more than or equal to 1.50, the product has a brighter visual appearance, and the glass density is less than 2.5g/cm³Meets the requirements of light weight and environmental protection of medicine packaging, and can be applied to the preparation of medical packaging materials.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Detailed Description

The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, and are not intended to limit the present disclosure.

The endpoints and any values disclosed in the present disclosure are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, one or more new ranges of values may be obtained by combining the endpoints of each range, the endpoints of each range and the individual values, and the individual values with each other, and these ranges of values should be considered as specifically disclosed herein.

A medium borosilicate glass composition, wherein the composition contains B₂O₃、SiO₂、Al₂O₃ZnO, alkali metal oxide, alkaline earth metal oxide and La₂O₃(ii) a In the medium borosilicate glass composition, B is based on the total weight of the composition₂O₃、SiO₂And Al₂O₃The total content of (A) is 88-92.5 wt%, and the total content of alkali metal oxides is 6-9 wt%; the total content of ZnO and alkaline earth metal oxide is 0.9-3.7 wt%; content of ZnO and alkaline earthThe ratio of the sum of the total contents of the metal oxides is 0 to 0.45; la₂O₃The ratio of the content of (A) to the sum of the total content of ZnO and the alkaline earth metal oxide is 0 to 0.5.

The technical scheme of the present disclosure is through pair B₂O₃、SiO₂And Al₂O₃The control of the total content can effectively stabilize the expansion coefficient, annealing point, strain point, softening point and operation temperature of the glass, obtain a temperature range suitable for melting, forming and processing, ensure the density, refractive index and chemical resistance of the glass, and further improve the performance of the glass by controlling the total amount of alkali metal oxide; ZnO and La₂O₃The composition can be matched with other components in the composition disclosed by the invention in a synergistic manner, so that the performance of the medium borosilicate glass is fully optimized, the composition is richer and more reasonable, and the composition proportion is more precise and accurate.

In the production of medium borosilicate glass, the difficulty of clarification is an important factor affecting the quality of medium borosilicate glass as well as the production cost. Good clarification can reduce defects such as stones, lines, bubbles and the like in production. The inventor of the present disclosure found in the research on the water resistance of the medium borosilicate glass that La is added as a fining agent to the medium borosilicate glass composition₂O₃The water resistance of the glass can be improved, the quality loss of the glass product is reduced, and the ion leaching amount of the glass product in water is reduced; thereby improving the alkali resistance of the glass, slowing down the corrosion of the alkali solution to the surface of the glass and inhibiting the ion precipitation on the surface of the glass.

Further, in the medium borosilicate glass composition of the present disclosure, La₂O₃Can promote part of BO in composition₃]To [ BO ]₄]And transforming to strengthen the glass structure and improve the glass stability.

Preferably, La is used based on the total weight of the composition₂O₃The content is 0 to 0.5% by weight, more preferably 0 to 0.3% by weight.

In one embodiment of the present disclosure, when La₂O₃With respect to the total content of ZnO and alkaline earth metal oxideWhen the ratio of the sum of the amounts is 0 to 0.5, a higher refractive index can be imparted to the product, and the optical properties of the product can be improved, preferably, when La is used₂O₃A better clarifying effect can be obtained when the ratio of the content of (A) to the sum of the total content of ZnO and the alkaline earth metal oxide is 0 to 0.3.

Further, in order to obtain a good clarification effect, the composition according to one embodiment of the present disclosure preferably further contains at least one additive selected from the group consisting of CeO₂And one or more of alkali metal sulfates, alkaline earth metal sulfates, and halides.

The sulfate of the alkali metal can be one or more of sodium sulfate, sodium bisulfate and potassium sulfate, and the sulfate of the alkaline earth metal can be one or more of calcium sulfate, barium sulfate and magnesium sulfate. The halide may be one or more of sodium chloride, ammonium chloride and magnesium chloride.

The borosilicate glass fining agent combinations used in the present disclosure preferably result in residual S residues in the glass product of less than 300ppm, thereby ensuring that the sulfate salt performs its fining function adequately in the fining process. The content of chlorine in mass percent calculated as Cl is preferably between 0.01 and 0.5 percent, so that excessive clarification caused by overhigh content of chlorine is avoided, droplets are avoided from being generated to opacify the glass, the corrosion to refractory materials is reduced, and the basic performance of the borosilicate glass is ensured.

In one embodiment of the present disclosure, the fining agent comprises CeO as a fining agent₂Based on the total weight of the composition, CeO₂The content of (B) is 0.01 to 0.5% by weight, preferably 0.01 to 0.4% by weight.

Preferably, in the disclosed medium borosilicate glass composition, La is used₂O₃And CeO₂As a clarifying agent, wherein, based on the total weight of the composition, La₂O₃0.01-0.5% of CeO₂The content of (B) is 0-0.4%.

According to the technical scheme, through selecting proper components and content of the clarifying agent, the clarifying agent can be matched with all the components in the composition, so that the viscosity of glass liquid is reduced in the glass melting process, the difficulty in glass melting is reduced, bubbles are eliminated, a higher clarifying effect is obtained, the yield of products is improved, and the glass tube suitable for medical use is obtained.

In the compositions of the present disclosure, SiO₂Is a medium borosilicate glass network forming body. SiO 2₂Can ensure the chemical stability of the product, improve the water resistance of the glass and reduce the thermal expansion coefficient. In the compositions provided by the present disclosure, SiO₂In an amount of 69 to 76% by weight. This range can be SiO₂And the glass composition is matched with other glass components in the composition, so that the glass product obtains better water resistance and lower melting temperature, and the production cost is reduced. In the composition of the present disclosure, SiO₂Can be generally introduced from quartz sand, and SiO is introduced through the quartz sand₂The content of impurity iron oxide is controlled below 240ppm so as to reduce production cost and ensure product quality.

Al₂O₃The glass network is a component constituting the glass network, and functions to reinforce the glass network structure, suppress glass devitrification, and improve the chemical resistance of the glass when the borosilicate glass contains an alkali metal. To achieve the effects of the present disclosure, Al₂O₃In an amount of 4 to 8 wt.%, which is in a range that Al may be contained₂O₃And the glass composition is matched with other glass components in the composition, so that the glass product obtains better mechanical strength and the production cost is reduced. The inventors of the present disclosure found that the content of alumina below this range would decrease the mechanical strength of the product, more likely to cause wire breakage during later use and processing, and that alumina above this range would increase the difficulty of glass melting, increasing equipment cost and energy consumption cost.

In the compositions of the present disclosure, B₂O₃Providing a random network component. With SiO₂The boron oxide used in proper proportion can reduce the thermal expansion coefficient of the glass, improve the mechanical strength and toughness, enhance the water resistance of the glass and reduce the high-temperature viscosity₂O₃Is contained in an amount of 8 to 12 wt%.

Due to B₂O₃、SiO₂、Al₂O₃The three oxides are the basis of the properties of borosilicate glass in water resistance, so that B needs to be further regulated and controlled₂O₃、SiO₂、Al₂O₃The total content M of the three oxides in percentage by mass can be selected, and B can be added by adding boric acid, borax and boron oxide into the mixture of quartz sand and alumina₂O₃、SiO₂And Al₂O₃. In the composition disclosed by the invention, the proper proportion of the three components can ensure that the melting temperature of the composition is within a certain range and the water resistance of the glass is ensured, so that the total weight of the composition is used as a reference while the single oxide is controlled within a certain range, and B in the medium borosilicate glass composition₂O₃、SiO₂And Al₂O₃The total content of (A) is 88 to 92.5 wt.%, preferably 88 to 92 wt.%.

In the composition of the present disclosure, an alkali metal oxide is further contained, and the alkali metal oxide is selected from Na₂O、Li₂O and K₂Any one or more of O. Wherein, Na₂O is an oxide of the external body of the glass, plays a role in breaking the network, and has the main functions of promoting melting, reducing glass crystallization, improving the structure of the glass and optimizing the physical and chemical properties and the process performance of the glass. And K₂O and Li₂O may fill the interstitial spaces between the glass atoms, reinforcing the glass structure, and in the compositions of the present disclosure, K₂O and Li₂And O is used simultaneously, so that the glass has an obvious synergistic effect and can improve the performance of the glass. Preferably, the borosilicate glass composition contains Na in an amount based on the total weight of the composition₂The content of O is 4-9 wt%, K₂The content of O is 0 to 9% by weight, preferably, K₂The content of O is less than 3 percent. Further, because of Li₂O is extremely aggressive to the refractory material, and the content is preferably 0 to 0.5%. In the composition of the present disclosure, Na₂O and K₂O can be introduced using a carbonate, sulfate, or the like as a raw material known in the art. To further reduce Li₂The corrosion of O to refractory material can be performed by fine ore with less impurity content and stable qualityIntroducing stone raw materials.

In the compositions of the present disclosure, Na is present as the total weight of the composition₂O、Li₂O and K₂When the total content R of the O in percentage by mass is 6.7-9 wt%, preferably 7-8.5 wt%, the glass can be ensured to have better water resistance and alkali corrosion resistance. Particularly preferably, the alkali metal is Na₂O、Li₂O and K₂O.

The borosilicate glass composition of the present disclosure further contains an alkaline earth oxide selected from any one or more of CaO, SrO, BaO, and MgO. Preferably, the alkaline earth metal oxide is a group consisting of CaO, SrO, BaO, and MgO.

The calcium oxide can be introduced using the more economical raw materials calcite or calcium carbonate, and in the compositions of the present disclosure, CaO belongs to the outer body of the glass, which is the glass-forming body B₂O₃、SiO₂And intermediate Al₂O₃The composition of the present disclosure contains 0.5 to 3 wt% of CaO, which provides necessary oxygen to improve the structural and processing properties of the glass, but the glass has a short glass fritting property due to the calcium oxide. The alkaline earth metal MgO is preferred to control the MgO content to 0 to 0.3 wt% because it is easy to cause flaking of the medium borosilicate glass under the action of water and alkali. BaO can improve the optical property of the glass, and is obviously superior to SrO with stronger alkalinity in the aspect of improving the chemical stability of the medium borosilicate glass, and the content of the BaO is 0 to 1.5 weight percent. The content of SrO is 0-0.5 wt%.

The composition disclosed by the invention also contains ZnO, and compared with glass containing no zinc, the glass added with ZnO has better acid-base corrosion resistance. The zinc oxide can also effectively reduce the high-temperature viscosity and the operating temperature of the glass, prolong the service life of a kiln, increase the crystallization tendency of a product when the usage amount is excessive, and also help to adjust the thermal expansion coefficient of the glass, and the content of ZnO in the composition disclosed by the invention is 0-0.5%, preferably 0-0.3%.

In the composition disclosed by the invention, proper amounts of CaO, SrO, BaO, MgO and ZnO are beneficial supplements of water-resistant borosilicate glass, the glass structure is adjusted, the processing performance is realized, zinc oxide has better capacity of enhancing alkali corrosion resistance of the glass, and the disadvantage of excessively increasing the dosage of alkaline earth metals exists. In order to obtain a low glass density and a suitable expansion coefficient, the total content of ZnO and alkaline earth metal oxide is 0.9 to 3.7% by weight.

In order to stabilize the production process, control the transmittance and transparency of the product and the color difference of the product, the iron content in the composition of the disclosure is controlled by Fe₂O₃Less than 300 ppm.

In a preferred embodiment of the present invention, the borosilicate glass composition contains 69 to 76% by weight of SiO, based on the total weight of the composition₂4-8% by weight of Al₂O₃8-12% by weight of B₂O₃3.9-9 wt% of Na₂O, 0-0.5 wt% Li₂O, 0-9% by weight of K₂O, 0-0.3 wt% MgO, 0.5-3 wt% CaO, 0-0.5 wt% SrO, 0-1.5 wt% BaO, 0-0.5 wt% ZnO, 0.01-0.5 wt% La₂O₃0 to 0.5% by weight of CeO₂。

The second aspect of the present disclosure provides a method for preparing a medium borosilicate glass, which includes sequentially performing melting, refining, forming, annealing and mechanical processing on the glass composition according to the first aspect of the present disclosure, wherein the temperature of the melting processing is 1550 to 1650 ℃.

In one embodiment of the disclosure, the preparation method comprises heating the medium borosilicate glass raw material composition to 1550-.

In one embodiment of the disclosure, the preparation process of the medium borosilicate glass is carried out in a laboratory, and the method comprises the steps of mixing the ingredients sufficiently and uniformly to obtain the medium borosilicate glass composition, melting the composition in a platinum-rhodium crucible at 1560-1660 ℃ for 4-8 hours, stirring with a platinum rod 1 hour before discharging, stirring for 15 circles clockwise and 15 circles anticlockwise within 3 minutes to remove bubbles, and clarifying and homogenizing the molten glass. And then, carrying out molding treatment on the melted glass liquid, carrying out annealing treatment at the annealing point temperature of 560-595 ℃ for 1.5-2.5 hours, and cooling to room temperature to obtain a glass product.

In the present disclosure, the glass article may be shaped by danna, wiener or molding to obtain a shaped glass article.

A third aspect of the present disclosure provides a medium borosilicate glass produced by the method provided in the second aspect.

In one embodiment, the medium borosilicate glass has a viscosity of 10⁴The operating temperature of dPa & S is below 1190 ℃, and the softening point temperature is below 800 ℃; the annealing point temperature is below 600 ℃; the strain point temperature is more than 510 ℃; coefficient of thermal expansion (x 10) of glass at 20-300 deg.C^-7v./deg.C) 45-56; an optical refractive index of 1.50 or more; fe in glass₂O₃Less than 300ppm, and glass density less than 2.5g/cm³。

A fourth aspect of the present disclosure provides the use of the borosilicate composition or borosilicate glass in the preparation of borosilicate glass articles for medical use.

The application can be, for example, preparing medical glass products such as borosilicate glass ampoules, injection bottles, tubular oral liquid bottles and the like.

Examples

The following describes in detail specific embodiments of the present disclosure. It is to be understood that each of the materials described herein in accordance with the present disclosure are commercially available, unless otherwise indicated, in a manner conventional in the art.

According to the disclosure, the compositions, contents, addition and proportions referred to in the examples are mass ratios (%) in units of indicated components or units of measurement, which are described with reference to tables.

The components were weighed according to the raw material compositions of the experimental examples and comparative examples shown in tables 1 to 3, mixed uniformly, and the composition was placed in a platinum-rhodium crucible in a free-stacking state, kept at the operating temperatures listed in tables 1 to 3 for 6 hours, and 1 hour before discharge, the glass liquid was stirred with a platinum rod to remove bubbles, and clarified and homogenized. Then, the melted glass liquid is poured on a stainless steel mold for molding, the molded glass is annealed for 2 hours according to the annealing point temperature listed in tables 1-3, a glass sample is obtained after the temperature is reduced to the room temperature, and various indexes of the borosilicate glass are tested according to the following test method:

the residual sulphur content in the glass was measured using a CS-9900 model infrared carbon sulphur analyser, characterised as S in ppm.

The coefficient of thermal expansion of the glass at 20 to 300 ℃ was measured using a horizontal dilatometer with reference to ASTM E-228, 10 on a unit basis^-7/℃。

The glass softening point, annealing point, was measured in degrees centigrade using an annealing point strain point tester according to ASTM C-336.

The glass working temperature was obtained by measuring the high temperature viscosity of the glass using a rotary high temperature viscometer with reference to ASTM C-964.

Glass Density is determined in g/cm according to ASTM C-693³。

The refractive index of the glass samples was measured using an abbe refractometer: after the mirror surface is cleaned and dried, a plurality of drops of the sample are dripped on the hair mirror surface of the auxiliary prism by a dropper, the auxiliary prism is quickly closed, and the closing knob is screwed. If the liquid is volatile, the action is rapid, or the two prisms are closed first, and then the sample is injected from the liquid adding hole by a dropper. The lens barrel is rotated to be vertical, the reflector is adjusted to enable incident light to enter the prism, and meanwhile, the focal length of the ocular lens is adjusted, so that the cross line in the ocular lens is clear and bright. The achromatic compensator is adjusted to cause the band of colored light in the eyepiece to disappear. And then adjusting the reading screw to ensure that the light and dark interface is just overlapped with the intersection of the cross line. The refractive index value on the scale disc is read from the reading telescope. The fourth digit after the decimal point can be read by a common Abbe refractometer, so that the reading is accurate, the sample is repeatedly measured for three times, the difference of each time cannot exceed 0.0002, and the average value is taken.

The water resistance at 98 ℃ is tested by reference to YBB00362004-2015 glass particles water resistance determination at 98 ℃.

The water resistance at 121 ℃ is tested by referring to YBB00252003-2015 glass particles water resistance determination at 121 ℃.

The alkali resistance is tested by referring to the method for measuring the boiling resistance of the mixed alkali water solution of YBB00352004-2015 glass.

TABLE 1

TABLE 2

TABLE 3

As can be seen from the test results of each of the experimental examples and comparative examples shown in tables 1 to 3, the working temperature (viscosity: 10) of the present invention⁴dPa.S) is not higher than 1190 ℃, the melting difficulty of the medium borosilicate glass is reduced, the softening point is less than 800 ℃, the preparation of medical packaging bottles by using glass tubes is facilitated, furthermore, the annealing point of the medium borosilicate glass is less than 600 ℃, the strain point is more than 510 ℃, and the thermal expansion coefficient of the glass at 20-300 ℃ (x 10)^-7/° c) between 45 and 56; in the aspect of optical performance of the glass, the refractive index is more than or equal to 1.50; fe in glass₂O₃Less than 300ppm, the product has a more brilliant visual appearance, and the glass density is less than 2.5g/cm³Meets the requirements of light weight and environmental protection of medicine packaging. In addition, the water resistance of the glass reaches HGB 1 grade, and the alkali resistance reaches 2 grade.

The preferred embodiments of the present disclosure have been described above in detail, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications are within the protective scope of the present disclosure. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the disclosure does not separately describe various possible combinations in order to avoid unnecessary repetition.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.