JPH02134221A - Manufacture of fire-resistant foam moldings of resin - Google Patents

Abstract

PURPOSE:To easily obtain moldings with smooth upper and lower surfaces by placing, before a mixing liquid of raw materials completes foaming, a cloth object which is chemically affinite with the mixing liquid in the upper part of the mixing liquid injected into a molding die. CONSTITUTION:A cloth object 4 which is chemically affinite with a mixing liquid 2 of a foaming material is laid at the bottom of the liquid 2. A cloth object 5 which is similarly chemically affinite with the liquid 2 is placed in the uppermost part of the liquid 2 injected into a molding die. A foam 3 becomes a cylindrical molding 3 having generally smooth upper and lower surfaces when it finishes foaming. The cloth object affinite with the foaming liquid 2 is, for example, a cloth or net made of glass fibers or synthetic fibers such as carbon fibers, polyamid or the like. From the using purpose of the molding 3, the material is preferably heat-proof.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention involves mixing and stirring two or more liquid raw materials and injecting the mixed liquid into a mold to produce a flame-resistant resin foam molded product. It is about the method.

(Prior Art) Conventionally, in the manufacturing method of this type of flame-resistant resin foam molded product, for example, silicone resin foam (Furukawa Electric product name S
E P-1900), by mixing and stirring approximately equal amounts of raw materials A and B, approximately 3.5
A flame-resistant resin foam with a specific gravity of approximately 0.4 g/c, c, can be easily obtained.

However, with such conventional methods, it is actually extremely difficult to obtain a foam molded article with a desired shape.

(Problems to be Solved by the Invention) Problems in such conventional methods will be explained in more detail with reference to the drawings as follows.

FIG. 3 shows a mold 1 having a desired shape, in this case a cylindrical shape, and reference numeral 2 indicates a raw material mixture before foaming, which is obtained by mixing and stirring two liquids A and B.

Reference numeral 3 in FIG. 4 indicates the foam molded product in a cross-sectional view after the foaming of the injected raw material mixture is completed.

In this case, as shown in FIG. 4, the foam molded product 3
The bottom A of the foam molded product 3 is concave, and the top B of the foam molded product 3 is convex. Therefore, the molded product has irregularities on the top and bottom, and is not a cylindrical molded product with smooth upper and lower surfaces, but can be cut at the A'-A'' plane and the B'-B- plane, respectively, as shown in Fig. 4. A post-processing method was used.

This caused many problems, including an increase in processing steps, a deterioration in yield, the skin layer formed on the top and bottom surfaces of the foam molded product, a decrease in the strength of the molded product itself, and poor appearance. .

(Means for Solving the Problem) As a result of intensive research to eliminate the drawbacks of the conventional methods, the present inventors have found a method to solve these problems at once, and have completed the present invention. reached.

That is, the method for producing a flame-resistant resin foam molded article of the present invention is a two-liquid or a three-liquid product, as shown in the drawings.
In a method of manufacturing a flame-resistant resin foam molded product of a desired shape by mixing raw materials with a liquid or higher content and injecting the mixture into a mold,
A cloth-like object having an affinity for the mixed liquid is placed in advance at the bottom of a mold having a desired shape into which the mixed liquid consisting of the two or more raw materials is injected, and then the mixed liquid is poured into the molding die. After injecting into the mold, before the raw material mixture completes foaming, placing a cloth-like object having an affinity for the raw material mixture on top of the injected raw material mixture in the mold. It is characterized by

The flame-resistant resin foam mentioned here includes not only the above-mentioned silicone resin foam, but also flame-resistant, thermally foamable foam, and foams such as Fomox, a product manufactured by West German Bayer AG, etc. There are no particular limitations on the composition as long as it is a composition that can be used to obtain a foam molded product by mixing and stirring two or more raw materials and injecting the mixture into a mold.

Next, the cloth-like object having affinity with the foamable mixed liquid 2 as the raw material may be, for example, a cloth-like object made of glass fiber, a rope-like object, carbon fiber, synthetic fiber such as polyamide, etc. Although not particularly limited, considering the intended use of the foam molded product 3, it is more preferable to use a heat-resistant material.

(Example) The invention is further explained in the drawings by means of examples.

Using raw materials and molds similar to those of the conventional ones described above, a cloth-like object having affinity with the mixed liquid 2 is placed at the bottom of the foamable raw material mixed liquid 2, as indicated by reference numeral 4 in FIG. 4, and a similarly compatible cloth-like object 5 was placed on top of the raw material mixture liquid 2 injected into the mold (see FIG. 1). The foamed product 3 that was foamed in this manner became a cylindrical molded product 3 with substantially smooth upper and lower surfaces, as shown in FIG.

(Effects of the Invention) As described above, according to the present invention, a desired molded product having smooth upper and lower surfaces can be obtained extremely easily. Compared to conventional methods, there is no need for post-processing steps such as cutting the surface and bottom layers of the molded product, resulting in improved yield and improved appearance of the molded product, while effectively leaving the upper and lower skin layers intact. can be used. Furthermore, by combining it with a compatible cloth-like object, it is possible to obtain a foam molded product with high layer strength.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a foamable raw material mixture, a mold containing the same, and a cloth-like object according to an embodiment of the present invention, and FIG. FIG. 3 is a schematic cross-sectional view showing a foam molded product and upper and lower cloth-like objects after foaming is completed; FIG.
FIG. 4 is a schematic cross-sectional view showing a mold into which the foam was injected; FIG. 1... Molding mold 2... Foaming raw material mixture 3... Foam molded product after foaming 4... Affinity cloth-like object laid on the bottom 5... Placed on the top Affinity cloth-like object Figure 1 Figure 2 Figure 3 Figure 4 Procedure Neho established August 18, 1989

Claims (1)

[Scope of Claims] A method for manufacturing a flame-resistant resin foam molded article of a desired shape by mixing one, two or three or more liquid raw materials and injecting the mixture into a mold, comprising: A cloth-like object having an affinity for the raw material mixture was placed in advance at the bottom of a mold having a desired shape into which the mixture of the above raw materials was to be injected, and then the raw material mixture was injected into the mold. After that, before the raw material mixture completes foaming, a cloth-like object having an affinity with the raw material mixture is placed on top of the injected raw material mixture. method of manufacturing the product.