JPS58194747A - Production of quartz glass product - Google Patents

Abstract

PURPOSE:Silicic acid gel resulting from hydrolysis of alkyl silicate is placed in a mold, the inside mold is taken out before tbe silicic acid gel shrinks by drying, further the gel is dried and calcined to produce quartz glass products simply in low costs. CONSTITUTION:Silica gel as a hydrolyzate of alkyl silicate is placed in a mold made of polyethylene or teflon, consisting of the outside part 1 and inner part 2, and stood for a while for solidification. The inside part 2 is removed at an appropriate stage before the gel starts shrinking and a cover is placed immediately to control the evaporation speed of the solvent for drying so that a molded product of the gel is obtained without formation of cracks. The resultant dried gel product is placed in a crucible and calcined at about 1,000 deg.C for glassification to give the objective quartz glass product.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing quartz glass products, and more particularly, for hydrolyzing alkyl silicate, the inner - is removed before the non-silicic acid gel obtained from K shrinks. Extraction-1: After that, KWK drying and firing method for producing quartz glass products were carried out.

In recent years, quartz glass products have been widely used due to their heat resistance, chemical resistance, and high purity properties. Furthermore, demand is also increasing year by year.

Silica glass with such excellent properties is currently manufactured by a melting method. In this melting method, natural quartz or high-purity silica sand is used as the raw material, and it undergoes a complex processing process of washing with water, sorting, hydrofluoric acid treatment, potting, and crushing.
It has the disadvantage of being expensive because it requires melting at a high temperature of about 0°C and a very long process 11.

Moreover, since the process is carried out at high temperatures, a large amount of energy is consumed.

In light of this, recently, 1000 fish without complicated Dingyu f salmon
A method called the sol-gel method, which allows silica glass to melt at low temperatures of around 0.9°C, is attracting a lot of attention.

Compared to the conventional melting method, this sol-gel method
It has many advantages in obtaining high quality glass, such as homogenization and other harmful birds.

However, this sol-gel method also has drawbacks, and the quartz glass obtained by this method has not been commercially available.

The main drawback of this method is that it is not possible to obtain large dry gels without cracks.

Glass products with rFi and special KvI shapes are available.
-9 It was almost impossible.

The object of the present invention is to use the sol-gel method to produce clay tube-shaped quartz glass products, which have not been possible until now.

The conventional method for obtaining tubular quartz glass will be explained below with reference to Figure 1.

In the figure, it is of the type T1 with external drawer i, and is made of a resin container made of polyethylene, Teflon, or polypropylene, or a glass container.

It is the inner mold of 2 and is made of the same material as 1.

The conventional method is to hydrolyze alkyl silicate, fill it with silica gel, and dry it to obtain a dry gel, which is then fired and fired to obtain a quartz glass tube. It was a method. However, in this method, when the dried gel contracts, it is squeezed into the inner mold and cracks, making it difficult to obtain a molded product.

The manufacturing method of the present invention replaces such gaps in the method of Example 4E by using the same packaging as copper 1, and filling the same strands with the hydrolyzate. If you leave it alone for a while, assimilation will begin. The mold inside the mold is removed at an appropriate time when the mold has not started shrinking.

MJl-nu-toshi et al. quickly put the lid on and obtain a dried gel molded body while controlling the evaporation rate of the solvent. In the explanation of the 1F, the shape is circular, but the shape may be any shape such as a square or hexagon, and of course it is also possible to have a shape that is not hollow but has a bottom.

The above is a general outline of the present invention, and is detailed in ζ et al.

Ethyl/licade 44.7g, xtanol 6ml, CL
The mixture was poured into a 40 ml flask containing IN hydrochloric acid, and stirred and mixed for 3 hours to hydrolyze ethyl silicate. Hydrolyzer, add this mixture to the container shown in Figure 1 [1 (outer @ q
The mold was poured into a mold with an inner diameter of 50 N and an outer diameter of 25 N. The material of the inner and outer molds was Teflon 41M#, and the mold was sealed with a polyethylene acid lid and left in a constant temperature bath at 60°C.

When 1L of the mixture began to solidify, the inner mold was quickly removed, the lid was covered with a polyethylene acid bag with five pinholes, and the mold was left to stand at 60°C for one week.

As a result, a tubular dried gel with a diameter of 18M5 was obtained. This gel was placed in a crucible furnace and heated to [1! It was heated to 1000°C in a cypress wood at S°C to vitrify it. The quartz glass tube made of quartz has an inner diameter of 250mm, an inner thickness of about t2m and 11m, and has 60 sides.
By measuring the yield spectrum, X-ray diffraction, cirrhosis, and refraction Hongo, #v! did.

Example 2 In the same manner as in Example 1, polyethylene acid f14It was used to obtain similar results to Honda IM&.

Example 3 In Example 1, when the hydrolyzate was loaded and flK was injected, the tube was sealed tightly or the tube was capped with a vent with 5 pinholes, and the same results as in the next section were obtained.

Although the method for producing tubular quartz products has been described above, quartz containers such as beakers can also be obtained by a similar method. It can also be applied to methods for manufacturing glass products of other compositions.

As described below, the method for producing quartz glass products of the present invention is an extremely energy-saving method because the production is carried out at low temperatures without going through any complicated steps.

Since quartz products made by this method are inexpensive, they are also used in the field of running, which is traditionally expensive, and demonstrate their heat resistance and #1 chemical properties. be.

[Brief explanation of drawings]

FIG. 1 shows an example of a Group 4 housing used in the manufacturing method of the present invention, where 1F'i indicates the outer mold and 2 indicates the inner mold. Applicant: Co., Ltd. - Kouseikokin Agent Patent Attorney: Tsutomu Mogami

Claims (1)

[Claims] In the production of quartz glass, which is made by putting the silicon gel obtained by hydrolyzing alkyl silicate into the IJK, drying and firing it, the silicon gel is removed from the inner glue before drying and shrinking. A manufacturing method for quartz glass products known as t%.