CN104761145A - Clarifying agent for high-borate glass and preparation method thereof - Google Patents

Abstract

The invention relates to a clarifying agent for high-borate glass and a preparation method thereof. The clarifying agent for high-borate glass is prepared from the following raw materials in parts by weight: 3-3.3 parts of mirabilite, 0.32-0.36 part of cerium oxide, 0.4-0.6 part of tin oxide, 4-5 parts of barium peroxide, 8-10 parts of mordenite, 2-2.5 parts of calcium fluoride, 2.2-2.5 parts of sodium chloride, 0.4-0.5 part of sodium bicarbonate, 3-5 parts of vapor-phase silicon dioxide and 5-7 parts of silica sol. By using the multiple clarifying components, the clarifying agent can remove various bubbles in the glass solution, can be used for producing high-borosilicate glass, and solves the problems of high viscosity and difficulty in clarifying in the high-borosilicate glass. The glass clarifying agent is free of arsenic, antimony and other high-toxicity substances, is friendly to the environment and harmless to the human body, and can not become black like arsenic-containing glass during processing. The sodium bicarbonate is granulated and calcined to form negative pressure inside the granules, thereby absorbing the small seeds and enhancing the effect of the clarifying agent.

Description

A kind of finings for high boron glass and preparation method thereof

Technical field

The present invention relates to glass manufacturing area, particularly relate to a kind of finings for high boron glass and preparation method thereof.

Background technology

Bubble in glass is one of major defect of glasswork, and the existence of a large amount of bubble has a strong impact on glass quality.For the visible bubble in bubble eliminated in glass must add a certain amount of finings in formula in the production process of glass.

At present, in glass production, white arsenic remains one of effective finings extensively adopted.But white arsenic has severe toxicity, 0.06 gram just can cause people desperately.On the other hand, when making finings with white arsenic, some enters in vitreum, with As ₂o ₃and As ₂o ₅form remainingly to get off, when lamp work heats, being easily reduced flame reduction becomes free arsenic, makes glass become black, has a strong impact on whiteness and the visual appearance of glass.Meanwhile, at high temperature about 1/3 volatile emission is in air for white arsenic, and contaminate environment, the white arsenic do not volatilized remains in glasswork, and when glass contain fluid medicine, drinks, beverage etc. can cause the stripping of arsenic, threaten to the physical safety of user.At present, some developed countries have limited containing arsenic glass product introduction domestic markets.In order to existence and the sound development of China's glass industry; from protection of the environment; ensure that the mankind are healthy and angle of exporting goods and earning foreign currency is set out; adopt nontoxic compound glass finings to replace white arsenic finings to produce glassy product, not only have larger economic benefit more to have great social benefit and environmental benefit.Therefore study nontoxic glass fining agent to have important practical significance.

Along with the improvement of glass kind and performance, make glass have damage resistant, withstand voltage, resistance toly to fall, shock resistance etc., the multiple excellence such as high transparency performance, but also there is more problem in production process, such as: the difficult problems such as temperature of fusion is high, surface tension is large, clarification difficulty is large, the high viscosity of these glass slow down the speed being removed bubble by stokes fining (Stokes fining); The fining effect by buoyancy of described stokes makes bubble rise to the surface of melt.Therefore, in order to improve the quality of glass further and reduce production cost, new finings be studied, improve the performance of glass, can also production cost be reduced, raise the efficiency.

Summary of the invention

The object of the present invention is to provide a kind of finings for high boron glass, this glass fining agent originally can remove the various bubbles in glass solution, can produce by high-boron-silicon glass, not containing the highly toxic material such as arsenic, antimony, environmentally friendly, harmless, add and can not turn black as containing arsenic glass man-hour, gas can be discharged step by step man-hour adding, greatly can reduce the seed concentration in silicate glass.

Technical scheme of the present invention is as follows:

For a finings for high boron glass, it is characterized in that being made up of the raw material of following weight part: saltcake 3-3.3, oxidation persimmon 0.32-0.36, stannic oxide 0.4-0.6, barium peroxide 4-5, mordenite 8-10, Calcium Fluoride (Fluorspan) 2-2.5, sodium-chlor 2.2-2.5, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 5-7.

The production method of the described finings for high boron glass, is characterized in that:

(1) by saltcake, oxidation persimmon, stannic oxide, barium peroxide, sodium bicarbonate mixing, pulverize, cross 500 mesh sieves, obtain powder;

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/2, evenly, dry, pulverize to particle diameter is at normal temperatures 1-100 micron, obtains particle in grinding;

(3) other remaining components mixed, grinding evenly, then adds the particle that (2) step obtains, and mix, granulation, particle diameter is 2-400 μm, sends into calcining furnace, at 340-350 DEG C, calcines 20-30 minute, takes out, to obtain final product.

Beneficial effect of the present invention

Finings of the present invention employs multiple clarification composition, can remove the various bubbles in glass solution, may be used for high-boron-silicon glass and produces, solve high-boron-silicon glass viscosity high, the problem of difficult clarification; This glass fining agent is not containing the highly toxic material such as arsenic, antimony, environmentally friendly, harmless, adds and can not turn black as containing arsenic glass man-hour; By using sodium bicarbonate granulation calcining, forming negative pressure in granule interior, little seed can be absorbed, improve finings effect; Production method of the present invention uses aerosil, effective constituent is separated, improves the high thermal resistance of finings, can discharge gas step by step man-hour adding, greatly can reduce the seed concentration in silicate glass.

Embodiment

For a finings for high boron glass, be made up of the raw material of following weight part (kilogram): saltcake 3.1, oxidation persimmon 0.34, stannic oxide 0.5, barium peroxide 4.5, mordenite 9, Calcium Fluoride (Fluorspan) 2.3, sodium-chlor 2.4, sodium bicarbonate 0.4, aerosil 4, silicon sol 6.

The production method of the described finings for high boron glass, is characterized in that:

(1) by saltcake, oxidation persimmon, stannic oxide, barium peroxide, sodium bicarbonate mixing, pulverize, cross 500 mesh sieves, obtain powder;

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/2, evenly, dry, pulverize to particle diameter is at normal temperatures 1-100 micron, obtains particle in grinding;

(3) other remaining components mixed, grinding evenly, then adds the particle that (2) step obtains, and mix, granulation, particle diameter is 2-400 μm, sends into calcining furnace, calcines 25 minutes at 345 DEG C, takes out, to obtain final product.

Experimental data: use the finings of this embodiment to make high-boron-silicon glass, make the block sample of 5c m x 5c m x 0.5c m again. the community of 5 m m x 5 m m x 5 m m is divided into marking pen, by the bubble number in each community of observation by light microscope record, the bubble number in calculating every cubic centimetre after comprehensive.Finally obtaining bubble number is 19, and bubble degree rank is a0.

Claims (2)

1. for a finings for high boron glass, it is characterized in that being made up of the raw material of following weight part: saltcake 3-3.3, oxidation persimmon 0.32-0.36, stannic oxide 0.4-0.6, barium peroxide 4-5, mordenite 8-10, Calcium Fluoride (Fluorspan) 2-2.5, sodium-chlor 2.2-2.5, sodium bicarbonate 0.4-0.5, aerosil 3-5, silicon sol 5-7.

2. the production method of the finings for high boron glass according to claim 1, is characterized in that:

(1) by saltcake, oxidation persimmon, stannic oxide, barium peroxide, sodium bicarbonate mixing, pulverize, cross 500 mesh sieves, obtain powder;

(2) mixed with the powder that (1) step obtains by the silicon sol getting 1/2, evenly, dry, pulverize to particle diameter is at normal temperatures 1-100 micron, obtains particle in grinding;

(3) other remaining components mixed, grinding evenly, then adds the particle that (2) step obtains, and mix, granulation, particle diameter is 2-400 μm, sends into calcining furnace, at 340-350 DEG C, calcines 20-30 minute, takes out, to obtain final product.