JPS6148438A - Production of glass fiber material utilizing waste glass fiber - Google Patents

Abstract

PURPOSE:To produce inexpensive glass fiber material by melting a mixture consisting of fine crushed waste glass fiber sticking to binder for sizing glass fiber with fine powdery raw material mixture for glass fiber in a glass melting furnace. CONSTITUTION:To 1pt.wt. waste glass fiber sticking to the binder for sizing glass fiber which has been crushed to <=5 mesh particle size, is admixed >=2 pts.wt. fine powdery raw material mixture for glass fiber consisting of >=80% component having <=200 mesh particle size. The mixture is melted in a glass melting furnace by heating with heavy oil or gas. During melting, 0.2-4m<3> air per 1 ton glass to be melted is introduced through a bubbler.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of utilizing glass fiber waste as a glass fiber material.

BACKGROUND ART When manufacturing various glass products such as plate glass, bottles, and cathode ray tubes, it is widely practiced to mix generated glass scraps as current into a glass preparation raw material (batch) and use it as a glass raw material. By mixing cullet into the batch, the meltability of 7
This method is industrially extremely preferred.

However, in the glass miscellaneous industry, glass fiber waste is hardly used as a raw material for glass, and is mainly discarded. The reason why glass fiber waste was rarely used, despite the extra cost and waste of valuable resources, is that the use of glass fiber waste had the following drawbacks: be.

(1) Glass fiber waste is long and intertwined with each other, so it is difficult to feed it into a glass melting kiln as it is;
In order to quantitatively input the glass fiber waste as a raw material, it is necessary to finely crush glass fiber waste, but it is extremely difficult to finely grind glass til HH compared to waste such as sheet steel.

(2) A binder for binding glass fibers, which is used when manufacturing glass fibers, usually has a solid content of about 0.3 to 2 vt% attached to the glass fiber waste. The binder is usually a film former (vinyl acetate, polyester
(urethane, starch, etc.), crosslinking agents (acrylic silane, vinyl silane, aminosilane, etc.), lubricants, and other organic substances with antistatic agents added as necessary. When glass tam scraps with such binder attached are put into a glass melting furnace, the binder carbonizes and carbon is generated, which mixes into the molten glass and causes coloring of the glass and generation of bubbles. This may cause problems such as:

The present inventor has found an industrially suitable method for pulverizing glass fiber waste, which is the first difficulty mentioned above, and has previously filed the application as Japanese Patent Application No. 58-19035 and Japanese Patent Application No. 58-29810. The present invention is a new proposal based on research to solve the second difficulty mentioned above. As mentioned above, heating glass fiber waste with a binder attached tends to cause the binder to form.It has also been proposed to prevent carbonization by heating glass Fa fiber waste under controlled conditions. (See Kosho 5B-4985i3)
However, this method involves complicated steps and cannot be said to be an industrially suitable method.

Glass fibers free of carbides can be obtained by heating glass fiber waste for a long time until sufficient ugliness is present, but this method has the drawback of consuming a large amount of fuel.

Attempts have been made to remove the binder by washing the glass ta fiber waste with water, but this method (referred to as the water washing method) has the following drawbacks.

(1) A large amount of water is required, and if the wastewater generated by this method is discharged as it is, it may cause pollution, and wastewater treatment equipment is required.

(2) Binder attached to glass fiber debris that has been pulled out from the bushing can be relatively easily removed by washing with water, but binder attached to glass fibers that have gone through the drying process should be removed by washing with water. is virtually impossible.

The present inventor has devised a method for effectively utilizing glass fiber waste finely pulverized by the method described above as a glass fiber material without causing carbonization of the binder, without complicated control, or without consuming a large amount of fuel. Numerous experiments were conducted to perfect this. As a result, the inventor of the present invention went against the conventional wisdom and developed glass! am
It has been discovered that if finely pulverized scraps are mixed into a raw material for preparing fine glass powder and put into a glass melting window, an unexpected effect can be obtained in which the binder can be burned off without causing carbonization by ordinary heating methods. , is proposed as the present invention.

Although the method of the present invention is extremely simple, it breaks conventional wisdom and has great industrial value as a method for producing glass fiber materials using glass fiber waste.

Next, the present invention will be explained in more detail.

When using the method of the present invention, glass fiber waste to which a binder is attached can also be suitably used. In the present invention, glass fiber waste is generated when a binder is applied to glass fibers pulled out from a bushing, the glass fibers are bundled, and the glass fibers are wound up. Glass fiber waste (
Glass fiber waste (hereinafter referred to as processing waste) generated when the once-rolled glass #am is dried and subjected to secondary processing such as pulling, twisting, gold thread, cutting, matting, etc. can be used.

To explain in more detail, there are three forms of thread waste as described below.

(1) The part at the beginning of winding when glass tafa is wound onto a collet (the diameter of the fibers in this part is larger than that of regular products) (2) Occurs when winding onto a collet is interrupted due to thread breakage, etc. Small volume.

(3) Debris generated when the yarn is pulled at low speed with a pull rail when the yarn breaks (the fiber diameter is extremely large compared to regular products). Although there is a big difference, the binder is easily removed by washing with water.

Processing waste includes cutting waste, residual thread waste, edge waste of mat-like products, defective products, end-size products, etc., but the binder cannot be removed by washing with water.

The above-mentioned glass fiber waste is, for example, disclosed in Japanese Patent Application No. 58-1903.
No. 5, No. 5B-29810. The thus finely pulverized glass fiber waste is sieved to remove foreign matter, and it is appropriate to use a material with a mesh size of 5 mesh or less, preferably 20 mesh or less. Patent Application No. 58-19035 and No. 5B-2
In the method of No. 9810, it is preferable to carry out the pulverization in a wet state, and the obtained pulverized product has a content of 6 to 12 wt%.
Contains some amount of moisture. This wet finely ground material (hereinafter referred to as wet finely ground material) is dried to remove 1wt of moisture.
% or less and then sent to a sorting process to remove metals such as iron, aluminum, and stainless steel that may be mixed in. Iron can be removed by magnetic force. Non-magnetic materials such as aluminum and stainless steel can be removed using magnetic force! However, it has been found that if the finely pulverized glass fibers are dried, they can be suitably removed by using a normal total refraction detection device.

In this way, metals mixed in the dried glass fiber finely ground material can be removed with high precision, but if the glass fiber finely ground material is wet, the detection accuracy of the mixed metals will be greatly reduced and good separation will not be possible. It has been found. The finely pulverized glass fiber waste from which mixed metals have been separated is mixed with the fine powder preparation raw material for glass fibers. As the raw material for fine powder preparation, a mixture of glass raw materials such as silica sand, charcoal calcium, colemanite, and alumina pulverized to a particle size of 200 mesh or less can be suitably used.

The raw material composition is not particularly limited as long as it is a glass ta miscellaneous composition, but for example, the following composition is suitable.

匡－１１１１１－-躬
%silica sand 45.0 ~ 4
8.0J Calcium Dioxide 25.0 ~ 28.0 Colemanite 11.0 ~ 14.0 Aluminum 10.0 ~ 12.0 Firefly
Stone 1.0 ~ 2.0 Sog Ash 0.5 ~ 0
．． As the 8-fine glass Ia fiber, a fine powder of 5 meshes or less, preferably 20 meshes or less is suitable. Although the composition of the im powdered glass fiber is not particularly limited, for example, one having the following composition may be used.

Si0 54.89 ROO, 85TiOO,
14 AI20314.13 2 Ca 0 22 ,? 7 Fe 20
30.25Mg0 0.37”F20.7
080 8.31 The finely powdered raw material is mixed at least twice as much, preferably at least three times, as much as the finely divided glass fiber. The preferred mixing ratio of Pf is 1:3~
The range is 1:10.

In the present invention, a mixture of both (hereinafter referred to as a water mixture) is used.
) into the glass melting window according to the usual method.

Heated with heavy oil, gas, etc. (usually 1500~180
It has been found that surprising results can be obtained without carbonization of the binder, without the use of special heating conditions or at a normal excess air content (approximately 5%). The reason why such a favorable result is obtained is not fully understood, but it is thought to be approximately as follows. The glass fiber dust to which the binder is attached is sufficiently finely pulverized and mixed with a large amount of finely powdered glass raw material. This mixture is bulky, and there is sufficient air around the glass fiber M1 scraps and mixed raw materials that are harder to melt than the glass fiber scraps.Moreover, gas is generated from the mixed raw materials by heating, so that the glass fiber scraps are mixed together. This seems to be because the surface area is kept large without melting to form a layer, and the surface comes into contact with air, which also has the effect of reducing the inclusion of bubbles.

Although there is no particular limitation on the type of kiln in which this mixture is to be heated and melted, it is desirable to use a kiln equipped with a bubbler.
A suitable length is about 4 tn', preferably about 0.4 to 2 m''.

Next, examples of the present invention will be shown.

The glass FA%i scraps to which a binder was attached, including processing scraps, were finely pulverized to obtain a finely pulverized product with a water content of 8 wt%.

This finely pulverized product was dried to have a moisture content of 0.08 wt%. The dried material was removed by a conventional method and sieved to a particle size of 20 mesh or less, which was mixed with a finely powdered glass raw material of 200 mesh or less. This mixture (weight ratio of glass fiber H and fine powder bond raw material 1:3) was put into a glass melting chamber,
The molten state of the mixture heated and melted at 0° C. was good, with no increase in gas contamination, and no coloring due to binder carbonization.

A glass fiber material was produced in the same manner as in Example 1 except for the conditions shown below. The results were as follows.

Claims (1)

[Scope of Claims] 1) A glass fiber layer characterized in that a finely ground glass fiber waste to which a binder for binding glass fibers is attached is mixed with a fine powder preparation raw material for glass fibers, and the mixture is put into a glass melting furnace and melted. A method for manufacturing glass fiber material using. 2) 2 parts by weight or more of a fine powder blending raw material for glass fibers is mixed with 1 part by weight of a finely ground glass fiber waste;
A method according to claim 1. 3) The particle size of the finely ground glass fiber waste is 5 mesh or less, and the particle size of 80% or more of the fine powder blending raw material for glass fiber is 200 mesh.
The method according to claim 1, characterized in that the size is smaller than a mesh. 4) 0.2-4m per ton of molten glass using a bubbler
The method according to claim 1, wherein ^3 air is introduced.