Brown coloring method for high borosilicate glass

Abstract

The invention discloses a brown coloring method for high borosilicate glass. The brown coloring method comprises the steps as follows: preparing a coloring material paste by using dextrin powder, NaOH, AgNO3, CuSO4, FeSO4, carbon powder, zinc powder, glycerol and water; coating to the surface of the high borosilicate glass; drying and placing into a muffle furnace; heating to 560-640 DEG C at a speed of 5-8 DEG C / min; insulating for 30-90min in a reducing atmosphere; and cooling to room temperature along with the furnace and taking out to obtain brown high borosilicate glass. The method can be applied to surface coloring of instrument glass, flat glass, electric vacuum glass, decorative glass and the like. The surface of a product can be subjected to large-area coloring treatment and can also be drawn into various patterns, marks or scales. By adjusting a formula and a heat treatment process of the coloring material paste, the problem that the brown high borosilicate glass is difficultly obtained due to ion diffusion coloring is solved, and the ion exchange process and the color reduction process are finished once, so that the brown high borosilicate glass is simple in preparation process, convenient to operate and low in cost, and is suitable for large-batch production.

Description

technical field [0001] The invention belongs to the technical field of colored glass, and relates to glass surface treatment, in particular to the technology of coloring the surface of high borosilicate glass by ion diffusion. Background technique [0002] The surface ion diffusion coloring of glass is used more and more in high-grade utensils, decorative glass, and arts and crafts. Silver and copper ion diffusion coloring are widely used in the printing of marks, scales, patterns, etc. of glass measuring instruments and utensils. method. [0003] However, this method is mostly used for surface coloring of ordinary soda-lime-silicate glass, but it is rarely applied to high borosilicate glass. High borosilicate glass is more widely used than ordinary glass due to its unique excellent properties such as low expansion coefficient, high glass strength and softening point temperature, strong thermal conductivity and good mechanical properties, especially in high-grade daily-use...

AI Technical Summary

Problems solved by technology

[0004] Most of the markings and numbers on the surface of high borosilicate glass measuring instruments (such as beakers, Erlenmeyer flasks, measuring cylinders, etc.) in the laboratory are printed white lines. It is also easy to wear and fall off, which greatly reduces the service life of the instrument

[0005] Copper red diffusion on borosilicate glass surface using CuSO 4 Or CuCl as a colorant, can get bright red, the disadvantage is that the red is too dazzling, if used in measuring instruments, the operator is prone to eye fatigue, and the divalent Cu 2+ Coloring needs to go through two or even three heat treatments, the process is cumbersome and difficult to control; while monovalent Cu + Usually two heat treatments are also required, and the Cl of CuCl - Severe volatilization during heat treatment

[0006] The silver yellow diffusion on the surface of high borosilicate glass is mostly made of AgNO 3 It is used as a coloring agent, but the obtained yellow color is too light, which makes it difficult for human eyes to identify, and the effect is not ideal

[0007] The silver and copper ions on the surface of high borosilicate glass are diffused and colored at the same time, and the colorant paste formula and heat treatment process applied to ordinary glass are difficult to apply

This is determined by the composition of high borosilicate glass. First, the content of alkali metal ions in high borosilicate glass, especially sodium ions, is very small, making it difficult for ion exchange reactions to proceed, and it is difficult for colored ions to enter the glass surface; second, high boron Silica glass does not contain reducing components such as arsenous, antimonous, and ferrous, which bring difficulties to the color development of colored ions

In addition, Ag during heat treatment + and Cu 2+ The diffusion speed on the borosilicate glass surface is not synchronous, the Ag + Than Cu 2+ The diffusion of the glass surface is much faster, which directly leads to the phenomenon of yellowish "fringe" on the edge of the pattern or line printed on the glass surface

[0008] In summary, the main problems faced by the current ion diffusion coloring method applied to high borosilicate glass are cumbersome process, difficult control, high production cost, low efficiency caused by multiple heat treatments, and unsatisfactory color and luster. Mass production

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