Ultraviolet-transmitting high-boron glass tube and preparation method thereof

Abstract

The invention discloses an ultraviolet-transmitting high-boron glass tube, which is prepared from the following raw materials by weight: 20-25 parts of boric acid, 12-18 parts of borax pentahydrate, 8-18 parts of anhydrous borax, 1-4 parts of aluminum hydroxide, 60-65 parts of quartz sand, 0.4-0.7 part of tartaric acid and 0.2-0.5 part of titanium oxide. The ultraviolet-transmitting high-boron glass tube provided by the invention has the characteristics of uniform outer diameter and wall thickness, good lamp working performance, high ultraviolet transmittance and the like; the preparation method comprises the following steps of: (1) uniformly mixing boric acid, borax pentahydrate, anhydrous borax, aluminum hydroxide, quartz sand, tartaric acid and titanium oxide, adding the mixture into anelectric melting furnace, completely melting the mixture into molten glass at 1480-1520DEG C, cooling the molten glass to 1000-1100DEG C, and enabling the molten glass to flow into a rotating pipe ofa forming machine; and (2) enabling the molten glass in the rotating pipe in the step (1) to enter a heat preservation box for homogenizing forming, then enabling the molten glass to flow into a cooling runway of 400-600DEG C, and enabling the molten glass to enter a dragger for drawing and cutting, thus obtaining the ultraviolet-transmitting high-boron glass tube. Standardized production of continuous feeding and continuous drawing is achieved through a Danla method (parallel drawing method).

Description

Technical field [0001] The invention belongs to the technical field of glass tubes, and specifically relates to an ultraviolet-transmitting high-boron glass tube and a preparation method thereof. Background technique [0002] Ultraviolet transparent glass tube has a good sterilization effect and can be widely used for sterilization in homes, schools and public places. For a long time, UV-transmitting glass tubes are made by melting glass in a crucible and manually drawn. Due to the low output of crucible melting and manual drawing, the labor intensity of workers is high, and the full melting of the glass cannot be guaranteed, let alone the drawing. The uniformity of the outer diameter and wall thickness of the glass tube affects the purple penetration rate, and the outer diameter and wall thickness are uneven, and the consistency is poor. It cannot be industrialized in the lamp making process, nor can it meet the needs of the high-quality market. At present, there are other meth...

AI Technical Summary

Problems solved by technology

For a long time, ultraviolet-transmitting glass tubes have been melted in a crucible and drawn by hand. Due to the low output of melting the crucible and drawing by hand, the labor intensity of the workers is high, and the full melting of the glass cannot be guaranteed, let alone the drawing. The uniformity of the outer diameter and wall thickness of the glass tube affects the purple transmittance, and the outer diameter and wall thickness are uneven and poor in consistency, which cannot realize industrial production in the process of making lamps, nor can it meet the needs of the high-quality market

At present, there are other methods to prepare UV-transparent glass tubes, such as the down-draw method to produce UV-transparent high-boron glass tubes. Due to the high boron content in the glass tube composition, the concentration of the glass liquid is very low due to the change of the composition. During the cooling process, it will The accumulation of glass liquid will cause streaks in the finished glass tube and affect the purple transmission rate, so it is not suitable for the down-draw method

In addition, although the Dan La method (parallel drawing) is a commonly used glass production technology, this kind of high boron glass tube, because the concentration of the glass liquid is low at high temperature, the conventional cooling is easy to harden and difficult to form in a short time. As a result, drawing cannot be carried out. Therefore, there are great limitations in the preparation of such UV-transparent glass tubes by the traditional Dan La method.