Glass, its preparation method and application

Abstract

The invention provides a glass, its preparation method and application. A kind of glass, expressed in the mass percentage of the following oxide basis, including the following components: SiO 2 68%~76%; B 2 o 3 6%~13%;Al 2 o 3 4%~6.5%;Na 2 O1%~5%; Li 2 O3%~8%; CaO1%~3%; La 2 o 3 0.1%~5%; and, CeO 2 0.1%~5%; among them, Na 2 O and Li 2 The total mass percentage of O is 5.6% to 11.2%, La 2 o 3 The mass percentage content of the B 2 o 3 The ratio of the mass percentage of the content ≥ 0.01, 21.0 ≤ A ≤ 23.0, A is obtained by the following formula: A = 0.25SiO 2 +0.27B 2 o 3 +0.21Al 2 o 3 +0.11Na 2 O‑0.05Li 2 O+0.01CaO‑0.08La 2 o 3 , where each component represents the mass percentage of the component. The above glass has good water resistance.

Description

technical field [0001] The present invention relates to a kind of glass, its preparation method and application. Background technique [0002] Boron-containing substances (NaBO 2 、Na 2 B 4 o 7 ) is extremely volatile, and the total volatile amount accounts for about B 2 o 3 15% to 20% of the content. [0003] During the glass melting process, boron volatilization can be divided into three stages. The first stage is before 300°C, as the temperature rises, boric acid is converted into HBO in turn 2 and H 2 B 2 o 4 Low boiling point hydrates and B 2 o 3 , the second stage is in the borosilicate and glass formation stage (300°C-1000°C), soda ash decomposes to generate Na with high chemical reactivity 2 O, react violently with boric acid to form NaBO with low boiling point 2 and Na 2 B 2 o 4 At this time, boron oxide and sodium oxide volatilize together, and the boron volatilization amount accounts for 63% of the whole volatilization amount at this stage. The thi...

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Problems solved by technology

[0004] Boron volatilization brings great trouble to the melting and molding of borosilicate glass. Firstly, during the melting process, the volatiles will seriously erode the refractory material in the upper space of the furnace. It leads to stone defects in the product; secondly, boron volatilizes on the surface of the molten glass to form a layer of metamorphic layer with low boron and high silicon. Stripe defects; in addition, boron volatilization in the feeding channel, material basin, and Danner tube during the tube drawing process will seriously corrode the refractory material and reduce the service life of the molding equipment; finally, in the production of control bottles, the volatilization of sodium oxide and boron oxide will The chemical composition of the bottle bottom and the bottle wall is not uniform, and the bottom is easy to drop during the freeze-drying process. At the same time, the volatile matter will condense on the inner wall of the glass tube, reducing the water resistance of the inner surface of the medicine bottle, and in severe cases, it will increase the pH of the liquid medicine. value, leading to drug failure

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