JPS59162152A - Manufacture of fireproof glass plate - Google Patents

Abstract

PURPOSE:To manufacture the titled glass plate in high productivity with generation of bubbles, by laminating a pair of glass plates interposing plural sodium silicate layers therebetween. CONSTITUTION:A solution obtained by adding glycerol to sodium silicate of No.3 or No.4 (JIS) is applied to the surface of a glass plate with a curtain flow coater to a thickness of 0.05-0.5mm., and dried at <=100 deg.C for 1-30min. The coating and drying are repeated several times until the thickness of the sodium silicate layer reaches about 0.2-5mm.. Another glass plate is placed on the sodium silicate layer, and the laminate is firmly integrated by heating under pressure in an autoclave.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a fire-resistant glass machine of the laminated glass plate type that sandwich a solid layer mainly composed of sodium silicate.

Glass board is relatively sensitive to flame and heat and may crack if exposed to straw. Glass plates with wire mesh embedded in them are also used to prevent the glass plates from cracking and falling off due to flames and heat, but they have the drawbacks of somewhat lower transparency and inferior heat shielding properties.

On the other hand, a fire-retardant glass of the laminated glass rice type sandwiching a solid layer containing sodium silicate as a main component has been proposed in Japanese Publication No. 47-1304 and other publications. This fire-retardant glass plate is normally transparent, and when heat is radiated due to a fire, the solid layer foams to form a heat insulating layer, and even if the glass machine breaks, the heat insulating layer remains intact. It is said that it will not fall because it is worn or attached. - However, this type of fire-retardant glass plate has the disadvantage that it is difficult to remove the air that causes bubbles contained in the solid layer during manufacturing, and the number of bubbles in the solid layer increases over time. . In order to more completely remove the air bubbles in the solid layer and the air that causes the air bubbles, drying and solidifying the solid layer in a high-humidity atmosphere for a long period of time will result in a transparent, bubble-free product that can be used for a long period of time. Although it is possible to produce a fire-retardant glass board with extremely low occurrence of cloudiness, it has the drawback that gradual drying and assimilation under such high humidity requires a long time of 1 to 2 days, resulting in low productivity.

The purpose of the present invention is to improve productivity, eliminate the need for drying a solution containing sodium silicate as a main component for a long time in a high humidity atmosphere, and provide a fire-resistant glass plate with less air bubbles. To provide the manufacturing method.

The method for manufacturing a fire-retardant glass plate according to the present invention involves coating a glass plate with a solution containing sodium silicate as the main component and drying it to form a layer containing solid phase silicate as the main component.
In the method for producing a fire-retardant glass plate by laminating and processing the glass plates by sandwiching the glass plates together, the solution containing sodium silica as a main component is applied in multiple doses using a curtain flow coater, This is a method for producing a fire-resistant glass plate, which is characterized by drying and laminating layers after each application to obtain a layer of desired thickness.

In a preferred embodiment of the method for producing a fireproof glass board according to the present invention, the coating thickness in each of the above steps is approximately 0.05 to 0.05.

In another preferred embodiment of the method for producing a fire-retardant glass plate according to the invention, the drying is carried out using an infrared or far-infrared dryer.

In another preferred embodiment of the method for producing a fire-retardant glass plate according to the invention, the layer thickness of the laminated solid phase is about 0.
It is 2 to 5 mm.

In the method of the present invention, a suitable solution containing sodium silicate as a main component (hereinafter referred to as diatom solution) to be applied to the glass plate is No. 3 or No. 4 sodium silicate specified in J.Eng. 5K1408. It is best to use Matakekon et al. with glycerin and other necessary ingredients added.

In order for the layer containing IJium as the main component (hereinafter referred to as a single silica layer) to be effective as a fire-retardant glass plate, it is preferable that the layer thickness be at least about 0.02 mm or more. . 1. The thicker the thickness, the better the fire protection effect, but from the viewpoint of ease of manufacture and handling of the product, it is best to keep it within 5 mm. Although it varies depending on the type of diatomaceous liquid, it is generally 30 to 55q for drying the swelling surface.
6. The weight is reduced to form a dielectric layer. For example, when the weight decreases by 50 inches due to drying, the volume simply increases by 5 inches.
Assuming that the thickness decreases by 0, for example, the coating thickness of the diatomaceous liquid for the required thickness of the diatomaceous layer between 02 and 2 is 04 to 2.
That means 5fi. Moreover, since the average specific gravity of sodium silicate No. 3 and No. 4 is approximately 1.32, the coating amount is 0.528 to 6.90 Ky/-.

If the diatomaceous liquid applied to the glass plate to a thickness of about 0.2 to 5 wn is dried and assimilated for a short period of time in a low-humidity, high-temperature atmosphere as described above, air bubbles will occur in the diatomaceous layer that is formed.
If performed in a high humidity atmosphere, bubbles will not be generated, but dryness and
It takes a long time, 1 to 2 days, to solidify. Therefore, in the method of the present invention, the diatomaceous solution is applied in multiple steps using a curtain flow coater, dried after each application, and laminated to form a layer of desired thickness.

By limiting the coating thickness of the diatomaceous liquid applied to the glass plate, even if the drying atmosphere has low humidity, air bubbles will not be generated in the diatomaceous layer formed by drying, and drying can be carried out quickly. The limited coating thickness of the diatomaceous solution is approximately 0.005 to 0.05 mm, although it depends on the type of diatomaceous solution. In particular, for No. 3 sodium silicate or toma with an adjuvant added, it is best to apply a coating N of about 0.05 to 0.3 mm, and for No. 4 sodium silicate as the main component. In this case, it is optimal to use a coating thickness of 0.05 to 0.4 degree of harmonicity. When coating a glass plate with a flow coater without using a frame, it is preferable that the coating amount be 0.05 mm or less because it will spill from the periphery of the glass plate. Furthermore, if the coating thickness is 0.5 mm or more, it becomes difficult to dry the coating in a single hour without generating bubbles, which is not preferable. For example, coating thickness "f",
If the thickness is 0.5 mm or more, even if infrared heating is performed at 100° C., it cannot be dried within 5 minutes, and there is a drawback that wrinkles occur on the blush surface, making it impossible to obtain a flat diatom layer surface.

The curtain flow coater used in the method of the present invention is widely used for coating paints, etc., and any known curtain flow coater can be used. The paint (in the case of the present invention, it is diatomaceous liquid) is extruded in a curtain shape through a slit with an adjustable gap, onto the object to be coated (in the case of the present invention, it is a glass plate) moving on a belt conveyor. It is applied. The coating thickness can be adjusted to an appropriate value by appropriately adjusting the extrusion pressure, the slit distance +1 jp, and the moving speed of the belt conveyor. Using a general curtain flow coater, No. 3 and No. 4 sodium silicate can be extruded into a curtain shape through a slit with a coating film thickness of about 0.05 to 0.05 mm without breaking the curtain. At this time, it is preferable to apply a predetermined pressure to the diatomaceous fluid extruded from the slit, although it depends on the type of diatomaceous fluid, temperature, etc. For example, the flow rate of the No. 3 or No. 4 sodium silicate solution is 5t/300m+n width/wn, and the moving speed of the belt conveyor is 100 m/min.
If this is the case, the thickness of the coating will be approximately 0.17 mm.

In general curtain flow coaters, the coating liquid is circulated, so air bubbles tend to get mixed in. In order to prevent or prevent air bubbles from entering, it is necessary to heat the diatomaceous solution to defoam it and to prevent air bubbles from entering when transferring it to the tank of the flow coater. Also, when circulating the diatomaceous fluid, make sure that the flow is smooth and that air bubbles are not trapped. When it is unavoidable that air bubbles are mixed in due to circulation, the circulation is stopped, the diatomaceous liquid is collected into a heating tank, and is poured into the boring head without air bubbles, and the extrusion pressure is applied to the slit by the head of the heating tank. Good to add.

Drying of the diatomaceous liquid applied to the glass plate in the method of the present invention can be carried out at a temperature of 100°C or lower, for example, at a temperature of 50°C to 95°C, in a highly humid atmosphere. A major feature is that no air bubbles are generated in the layer and drying can be carried out quickly. Although any type of dryer may be used, an infrared or far infrared dryer is a suitable dryer. For example, coating film 0.05~
One coating layer of about 0.05 system can be dried in about 1 to 30 minutes. Therefore, for example, when applying 10 times and laminating a diatomaceous layer, it is sufficient to dry it in about 10 minutes to 5 hours, and even if it is combined with coating, it can be dried in about 15 minutes to 6 hours. can.

Conventionally proposed methods can be used to process glass plates laminated with diatom layers to form a fire-retardant glass plate. This laminating process is carried out in water or glycerin at a temperature of 70 to 100°C, or the surface of the silica layer is coated with water, sodium silicate solution, or glycerin, and then laminated, or further laminated. By heating and pressurizing and bonding in an autoclave afterwards, a glass plate with good fire resistance can be obtained.

EXAMPLE A fire retardant glass board was manufactured using the following materials and equipment.

0Glass plate size: 300x300 groups, thickness: 3mm ○Sodium silicate solution No. 3 solution containing 3% by weight of glycerin added to sodium silicate O Curtain flow coater Iwata coating machine (silk FL- 83D Effective coating width 300mm, slit width 0 to 10mm, conveyor speed 25-150m/imO dryer infrared dryer, drying method where the material to be dried is transferred by mesh belt conveyor, heating side 300tms heating section 1500m, conveyor Speed 300 mm/M, furnace temperature set 100°C.

The conditions for the curtain flow coater are slit width 0.4mm,
:7 Bearing speed 1 o m/min (Flow rate of Irj ischemic liquid, 5 L/min/300 ttan width)
As a coating, diatomaceous liquid was applied to the glass plate once to a thickness of 02,
Subsequently, it was dried in an infrared dryer. The painting time was less than 1 minute, and it took about 5 minutes to dry. The coating and drying process was repeated 10 times to form a diatomaceous layer about 1 inch thick. Prepare two glass plates with diatomaceous layers formed on their surfaces in this way,
The dilapidated layers were destroyed. Next, put this combined glass board into an autoclave and heat it to 110°C.
] Heat and pressure bonding was carried out at 0 atmospheric pressure for 45 minutes, and lamination processing was carried out. No air bubbles were observed in the diatom layer of the obtained laminated glass plate.

As described above, when using the method of the present invention, a fire-retardant laminated glass plate sandwiching a solid layer mainly composed of sodium silicate can be produced in a short time, and the drying process requires high temperature and high humidity. Since no atmosphere is required, drying can be performed easily and efficiently, improving productivity.

Furthermore, the layer containing sodium silicate as a main component of the resulting fire-retardant glass plate does not contain air bubbles.

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Claims (1)

[Claims] (1) A solution containing sodium silicate as the main component is applied to a glass plate and then dried to form a layer containing solid sodium silicate as the main component, and the layer is sandwiched between the glass plates and the glass plate is dried. In the manufacturing method of fire-retardant glass plates that are manufactured by laminating plates, the application of the solution containing sodium silicate as the main component is divided into multiple times using a curtain flow coater, and after each application, A method for producing a fireproof glass board, which is characterized by drying and laminating layers to a desired thickness. (2) The thickness of each coating above is 0.5 w.
The method for producing a fire-retardant glass plate according to claim 1, which is +. (8) The method for producing a fire-retardant glass plate according to claim 2, wherein the drying is performed using an infrared or far-infrared dryer. (4) Claims 1 and 2, wherein the layer thickness of the laminated solid phase is approximately 0.2 to 5 mm. ! J or the method for manufacturing fire-retardant glass plates as specified in Section 3.