JPH0225319A - Manufacture of incombustible fiber reinforced foamed resin sheet - Google Patents

Abstract

PURPOSE:To make it possible to continuously manufacture a thin sheet, at the surface of which an incombustible layer is equipped, by a specified process wherein the layer consisting of incombustible inorganic powder is integrally produced onto the surface of a foamed resin sheet. CONSTITUTION:A fiber mat-like sheet 2, which consists of foaming resin- impregnated glass fiber non-woven cloth mat or the like, is placed on a belt conveyer 1. Inorganic powder such as cement powder or the like is sprinkled evenly with a sprinkling device on the mat 2 while transferring and before the resin expands and sets. Next, the resultant mat is sent to a heating furnace 4 for foaming by heating. Finally, the foamed resin is pressed with a pressing conveyer 5 or the like in order to be compression-molded into a sheet material G having the predetermined thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a method for manufacturing a nonflammable fiber-reinforced foamed resin board.

[Conventional technology]

Conventionally, fiber-reinforced foamed resin boards have been widely used for construction boards and the like because they are lightweight, have excellent heat insulation properties, and are aesthetically pleasing.

Incidentally, the fiber-reinforced foamed resin board needs to be flame retardant, and in order to further strengthen this, a non-combustible aluminous layer made of metal, cement, etc. may be provided on the surface.

[Problems with conventional technology]

However, when providing the above-mentioned noncombustible layer, it is generally done by laminating and adhering metal plates or inorganic plates such as cement, but this tends to cause peeling between the eyebrows due to differences in shrinkage rate, and acid-curing type foam resin plates are used. When a phenol resin material is used, there is a problem that the metal plate is corroded by the acid, and in the case of a cement board, there is a problem that the interfacial adhesion becomes poor.

Furthermore, when a ceramic plate material such as cement is used as the noncombustible layer, it is difficult to form a thin plate material, which is contrary to weight reduction, and it is also difficult to form a long plate material.

Furthermore, some adhesives are flammable, so
It also had the disadvantage that it was difficult to select an adhesive taking into account the chemical properties of the laminate.

[Problem to be solved by the invention]

In view of the above drawbacks, the present invention aims to provide a method for manufacturing a noncombustible fiber-reinforced foamed resin board that has a noncombustible layer on the surface, can be made thin, and can be manufactured through a continuous process. It has been done.

[Technology that led to solving the problem]

That is, the method for producing a nonflammable fiber-reinforced foamed resin board of the present invention involves placing a fiber mat-like sheet impregnated with a foaming resin on a belt conveyor, transporting the sheet, and scattering inorganic powder in a uniform layer on its surface. Thereafter, the resin is transferred to a foaming heating furnace to cause a foaming reaction of the foaming resin, and is compressed to a constant thickness and hardened.

[Effect]

In this invention, as the foaming resin, a thermosetting resin with a foaming agent added is mainly used.

Generally, when manufacturing a fiber-reinforced foamed resin board using these resins, a fiber mat-like sheet made of glass fiber or the like is impregnated with the resin and the resin is foamed.

Therefore, in the unfoamed stage, "resin-impregnated muff 1.
If inorganic powder such as metal powder or cement powder is sprinkled on a uniform layer and the resin is foamed with these powders placed on top, in the compression process for adjusting the plate thickness in the later process,
The inorganic 4JJ] end is buried in the resin matrix I/wax,
This resin will bind them together and form a substantially thin non-combustible surface layer.

In this invention, the inorganic powder used is hardened in the form incorporated into the resin, as is clear from the above two explanations, so the material itself is not limited at all, and may include metal powder, cement powder, fine powder, etc. It is also possible to use grained sand.

〔Example〕

Next, the present invention will be explained in detail.

As shown in FIG. 1, a glass fiber nonwoven fabric mat 2 impregnated with a foamed resin is placed on a heel conveyor 1, and while being transported, cement powder is poured onto a glass fiber nonwoven fabric manor 1-2 before the foaming hardens. The material is uniformly spread by the spreading device 3 to a thickness of about .2 to 0.65 mm, then sent to the heating furnace 4 to be heated and foamed, and the foamed resin is pressed by the pressing conveyor 5 to compress the plate material G of a predetermined thickness. Molded.

As shown in Fig. 2, the obtained plate material G has an inorganic layer G2 with a thickness of 0.2 to 0.4 mm formed on the surface of the fiber-reinforced foamed resin body 09, and no cracks will occur even if it is repeatedly bent. There wasn't.

〔effect〕

As explained above, this invention integrally forms a layer made of nonflammable inorganic powder on the surface of a foamed resin board, so that this layer can serve as a substantial noncombustible layer, and the resin containing corrosive components However, since the powder is integrated with the resin as a binder, there is no risk of delamination, and a strong, lightweight, nonflammable fiber-reinforced foamed resin board can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a side view of an apparatus for carrying out the method of this invention;
The figure is a cross-sectional view of a nonflammable fiber-reinforced foamed resin board obtained by the method of the present invention.

Claims (1)

[Claims] (1) A fiber mat-like sheet impregnated with a foaming resin is placed on a belt conveyor and transported, an inorganic powder is spread on the surface in a uniform layer, and then transported to a foaming heating furnace.
A method for producing a nonflammable fiber-reinforced foamed resin board, which comprises causing a foaming reaction of the foaming resin, compressing it to a constant thickness, and curing it.