JPH022587Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an asphalt foam sheet suitable for automobile or architectural floor materials, wall materials, etc.

Asphalt foam is a foam body containing asphalt, and has excellent sound absorption, sound insulation, and heat insulation properties, and is therefore particularly used as a floor material for automobiles. It should be noted that asphalt foam has long been known to be made by melting and impregnating asphalt into a soft urethane foam having open cells, or by impregnating it with asphalt emulsion. Because it is easy to ply, it is not very suitable for flooring materials, etc., and is used exclusively as a joint material.
Asphalt foam, which is suitable for flooring and wall materials, is produced using a manufacturing method previously proposed by the applicant (Japanese Patent Application No. 1983-
125373 (Japanese Unexamined Patent Publication No. 15433/1983)).

The asphalt foam suitable for the flooring materials mentioned above is made by mixing a specific urethane prepolymer (obtained by reacting a polyether polyol with an ethylene oxide content of 15% or more with an organic isocyanate) and an aqueous emulsion of asphalt. It is obtained by foaming. The asphalt foam obtained in this way has asphalt itself forming the foam base, so it is extremely stable compared to urethane foam that is later impregnated with asphalt, and it is also noticeable that the asphalt separates and oozes out onto the surface. is suppressed. Therefore, this asphalt foam can be compression molded to obtain appropriate hardness for various uses such as flooring materials.

However, even if the asphalt foam is manufactured by the method proposed by the above-mentioned applicant, it is inevitable that an asphalt-like sticky feeling remains on the surface. However, when an asphalt foam sheet obtained by slicing this into a predetermined thickness is used, for example, as a floor material for an automobile, the following problems occur.

First, when an asphalt foam sheet is used as a floor material for an automobile, a carpet or carpet is usually spread over it, and in this case, there is a problem in that these rugs get dirty.

In addition, at construction sites where car interiors are done, asphalt foam sheets, rugs such as carpets, and other interior materials are piled up and prepared, so during the preparation period, the rugs, felt, woven fabric, and other interior materials are There was a problem that the foam sheet caused stains.

The present invention was developed in view of the above circumstances, and its purpose is to provide an asphalt foam sheet with a structure that will not stain other interior materials when used as flooring or wall materials. It is something to do.

That is, the present invention has an ethylene oxide content of 15
% or more of a polyether polyol and an organic isocyanate are added and mixed into an aqueous asphalt emulsion and foamed.On one or both sides of a sheet made of asphalt foam, This is an asphalt foam sheet characterized by adhering a soft polyurethane foam sheet.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view showing an asphalt foam sheet according to an embodiment of the present invention. In the figure, reference numeral 1 indicates an asphalt foam produced by the method disclosed in Japanese Patent Application No. 125373/1988, which has been sliced into a sheet having a thickness of 2 cm. On one side of the sheet-like asphalt foam 1, a flexible polyurethane foam sheet 2 is integrally coated and bonded. The flexible polyurethane foam sheet 2 may be as thin as approximately 2 mm to 5 mm in thickness. Further, as the adhesive, a general adhesive such as a rubber glue or a synthetic resin emulsion type adhesive can be used, and the adhesive may be bonded using a known adhesive method such as a spray method or a transfer method.

In the asphalt foam sheet shown in Fig. 1 above, the surface is integrally covered with the soft polyurethane foam sheet 2, so it is possible to spread a rug such as a carpet over it, or cover it with wall covering materials such as felt or woven fabric. These interior materials will not be soiled even when used. Furthermore, other materials such as carpets are not soiled during the preparation stage at the construction site, and the conventional problems can be completely avoided.

FIG. 2 is a sectional view showing an asphalt foam sheet according to another embodiment of the present invention. In this embodiment, flexible polyurethane foam sheets 2, 2 are integrally coated and bonded on both sides of a sheet-like asphalt foam 1. The rest is exactly the same as the embodiment shown in FIG. 1, and the same effects can be obtained.

In both of the embodiments shown in FIGS. 1 and 2, the sheet-like asphalt foam 1 may be used as it is at the density obtained by foaming, or the entire sheet may be used as it is, if necessary. It may be used after being densified by heating and compressing.

As detailed above, even when the asphalt foam sheet according to the present invention is used together with other interior materials such as carpets, felts, or woven fabrics, these other interior materials may be contaminated. This has remarkable effects, such as being able to avoid problems.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing asphalt foam sheets according to embodiments of the present invention, respectively. 1... Sheet-like asphalt foam, 2...
Soft polyurethane foam sheet.

Claims (1)

[Scope of utility model registration request] A sheet made of asphalt foam obtained by adding and mixing a urethane prepolymer obtained by reacting a polyether polyol with an ethylene oxide content of 15% or more with an organic isocyanate into an aqueous asphalt emulsion and foaming the mixture. An asphalt foam sheet characterized by having a soft polyurethane foam sheet adhered to one or both sides.