JPH0649229A - Production of molded article of glass wool - Google Patents

Abstract

PURPOSE:To obtain a molded article of glass wool in the approximately the same molding time even in using glass wool manufactured by centrifugal method as that in using glass wool produced by flame drawing method by molding glass wool by a specific method. CONSTITUTION:The molded article is obtained from glass wool which is produced by centrifugal method by using a phenol resin and urea in the ratio of solid content of 10:0.8-8:2 as a binder without using ammonia water and ammonium sulfate as an additive. The molding condition, for example, in the case of molding raw fibers having 500g/m<2> face density into a 5mm flat plate by a press molding machine, is generally 180-230 deg.C molding temperature and 40-60 seconds molding time. Glass wool having 4-7mu fiber diameter and 30-100mm fiber length is used as the glass wool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing various glass wool molded articles such as vehicle insulators, and more particularly to a method for producing glass wool molded articles using glass wool produced by a centrifugal method.

[0002]

2. Description of the Related Art The so-called centrifugal method and flame extension method are known as methods for producing glass wool. The former centrifugal method is the same principle as making cotton candy, in which the molten glass is spun off from the spinner by centrifugal force, and further a high-speed air stream is applied to form fibers. Is applied to form fibers. Then, conventionally, a glass wool molded article is produced by using glass wool produced by the centrifugal method or flame extension method. Further, in such a conventional method, a phenol resin and urea are mixed and used as a binder, and ammonium hydroxide as a diluent for stabilizing the phenol resin and ammonium sulfate as a coloring aid for yellow are used as an additive.

[0003]

When a glass wool molded article is produced using glass wool produced by the centrifugal method and flame stretching method, the molding time is longer when the glass wool produced by the flame stretching method is used. Is known to be short. However, the flame stretching method requires about 8 times as much heat input as the centrifugal method, and the centrifugal method is superior from the viewpoint of energy cost and energy saving. In the case of using glass wool produced by the centrifugal method, It is earnestly desired to shorten the molding time. It is an object of the present invention to provide a method for producing a glass wool molded article that can satisfy such a demand.

[0004]

The method for producing a glass wool molded article according to the present invention comprises:
A method for producing a glass wool molded article using glass wool produced by a centrifuge method, which comprises using a phenol resin and urea as a binder in a solid content ratio of 10: 0 to 8: 2, and adding an ammonium hydroxide as an additive and It is characterized by not using ammonium sulfate.

As the glass wool, glass wool having a fiber diameter of about 4 to 7 μm and a fiber length of about 30 to 100 mm is generally used, but the fiber diameter and the fiber length are not particularly limited.

As the phenolic resin, a resol type phenolic resin, a urea-modified resol type phenolic resin or the like is used. In the present invention, however, the phenolic resin and urea are not used, and ammonium hydroxide and ammonium sulfate as additives are not used. It is essential to use the solid content ratio in the range of 10: 0 to 8: 2, and if the ratio of urea exceeds the range of 8: 2, the effect of shortening the molding time cannot be obtained.

Furthermore, molding time, the molding temperature by the shape of the molded body density and molding of raw cotton, suitably are selected, for example, surface density 500 g / m 5mm thick flat plate ² of the cotton in the press molding machine 180 to 2 when molded into
Generally, the molding temperature is 30 ° C. and the molding time is 40 to 60 seconds.

[0008]

According to the present invention, a molded product is formed by using a phenol resin and urea as a binder in a solid content ratio of 10: 0 to 8: 2 and without using ammonium hydroxide and ammonium sulfate as additives. As a result, even if the glass wool produced by the centrifugal method is used, it is possible to form the molded article in the same molding time as when forming the molded article using the glass wool produced by the flame stretching method.

[0009]

EXAMPLES Next, the present invention will be explained based on examples. FIG. 2 shows that when 30% by weight and 3% by weight, respectively, of ammonium hydroxide and ammonium sulfate as additives were added to the solid content of the binder resin, the phenol resin and urea constituting the binder were added at a solid content ratio of 10: 0, 9: 1, 8: 2, 7: 3, 6: 4
The results of measuring the molding time required for molding in the case of each composition ratio are shown. Resol type phenol resin was used as the phenol resin, and industrial urea was used as the urea.

In addition, the molding time is such that the surface temperature of the upper and lower hot plates of the raw cotton having a glass fiber diameter of 7 μ and an area density of 500 g / m ² is 190
Evaluation was made in the shortest time without bulging when molded into a flat plate having a thickness of 5 mm by a press molding machine at ℃.

As is clear from FIG. 2, the minimum value of the molding time appears in the region where the solid content ratio of the phenol resin and urea is 8: 2 to 7: 3, but in the case of using glass wool by the flame stretching method. It can be seen that compared with the molding time of 25 seconds under the same conditions, the molding time required a long time even in the composition ratio in the minimum region.

FIG. 1 shows that, under the same molding conditions as described above, except that ammonium hydroxide and ammonium sulfate as additives are not used, the phenol resin and urea constituting the binder are mixed in a solid content ratio of 1.
The molding time was measured when the composition ratios were 0: 0, 9: 1, 8: 2, 7: 3, 6: 4. As is clear from FIG. 1, the solid content ratio of phenol resin and urea is 1
In the range of 0: 0 to 8: 2, the molding time is about 25 seconds as in the flame stretching method under the same molding conditions.

As described above, a phenol resin and urea are used as a binder in a solid content ratio within a range of 10: 0 to 8: 2, and a molded product is molded without using ammonium hydroxide and ammonium sulfate as additives. It was confirmed that even if the glass wool produced by the centrifugal method is used, the molded article can be formed in the same molding time as the case of forming the molded article using the glass wool produced by the flame drawing method.

[0014]

As described above, according to the method for producing a glass wool molded article of the present invention, even if the glass wool produced by the centrifugal method is used, the same degree of molding as that of the glass wool produced by the flame centrifugal method is used. It has the effect that it can be molded in time.

[Brief description of drawings]

FIG. 1 is a characteristic diagram showing the relationship between binder composition and molding time.

FIG. 2 is a characteristic diagram showing the relationship between binder composition and molding time.

Claims (1)

[Claims] 1. A method for producing a glass wool molded article using glass wool produced by a centrifugal method, wherein a phenol resin and urea are used as a binder at a solid content ratio of 10: 0.
A method for producing a glass wool molded article, characterized in that it is used in the range of 8: 2 and does not use ammonium hydroxide and ammonium sulfate as additives.