Preparation method of solar ultrawhite ultrathin glass and product thereof

Abstract

The invention relates to the field of production of ultrawhite rolled glass, in particular to a preparation method of solar ultrawhite ultrathin glass and a product thereof. The preparation method of the solar ultrawhite ultrathin glass comprises the following steps of: selecting and preparing raw materials; conveying the raw materials; melting; forming glass; annealing; detecting; and cutting and packaging. In the preparation method, iron content is controlled by taking different measures in the steps of selecting and conveying the raw materials, so that iron sulfide in the final solar glass is greatly reduced and the whiteness of the glass is improved; in the melting process, bubbles in the melted glass liquid is reduced by exhausting air and debubbling, controlling temperature and adding a glass clarifying agent, so that absorption rate is reduced and light transmittance is improved; and the annealing step of the glass finished product is a key link of the production process and plays an important role in the quality of the ultrathin glass product, so the defects that the ultrathin glass is easy to harden and easy to break during production and has high fragility are overcome by controlling rolling velocity, temperature and annealing rate in the process of glass forming and glass annealing.

Description

technical field [0001] The invention relates to the field of ultra-clear rolled glass production, in particular to a method for preparing solar ultra-white ultra-thin glass and products thereof. Background technique [0002] With the development of photovoltaic technology, it is necessary to use ultra-clear glass with high light transmittance as the substrate material. Most people think that ultra-white glass can be called ultra-clear glass because the total iron content in the glass is below 200ppm. However, the raw materials and production process of glass production lead to a certain amount of iron and sulfur in it, and in glass The combination of sulfur and iron can give the glass an undesirable yellow-green color when viewed from the edge due to the formation of iron sulfides (commonly referred to as iron sulfides or iron polysulfides). [0003] CN200810241740.9 discloses a kind of ultra-clear float glass, which includes a base glass part and a colorant part. The color...

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Problems solved by technology

[0005] An important way to effectively increase the light transmittance of glass is to reduce the iron content in the glass. However, it is difficult to reduce the iron content to a lower value on the one hand, and on the other hand, the reduction of the iron content will make the glass difficult to clarify.

[0006] One of the important factors in glass quality is the bubbles contained in glass. Glass is melted at high temperature by mixing silica sand, soda ash, limestone and other raw materials together. The glass melted at high temperature is a kind of high viscosity liquid. Contains a large number of bubbles. When no clarifier is used, the content of carbon dioxide and nitrogen in the bubbles is the most, and they cannot be melted in the molten glass. If the bubbles rise to the glass liquid surface and then burst and release, it will need to consume A lot of time, does not meet the requirements of industrial production

[0007] In the past, arsenic was introduced into the glass batch as a clarifying agent in order to reduce air bubbles in the glass. However, arsenic will partially volatilize at high temperature and cause environmental pollution, and as a highly toxic substance, arsenic is difficult to manage

[0008] CN200710054549.9 provides a solar ultra-clear rolled glass component, which is based on the common flat ultra-clear glass composition, adding oxides of lanthanum oxide, bait oxide and cerium oxide of rare earth elements. However, from the perspective of the final glass product, The whiteness of its section and the light transmittance of the glass need to be improved

[0009] For occasions with special application requirements, such as high light transmittance, it is necessary to prepare ultra-thin solar ultra-clear glass. However, the disadvantage of ultra-thin glass is that it is easy to harden and brittle, which poses a greater challenge to the glass preparation process.

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