JPS6031928A - Compression molded product of chip urethane foam - Google Patents

Abstract

PURPOSE:To obtain a hard and light compression molded product by a method wherein at least one of semi-hard or hard chip urethane foam is mixed with soft chip urethane foam and this mixture is dispersed uniformly in urethane resin. CONSTITUTION:As chip material is used a mixture obtained when semi-hard chip urethane foam and/or hard urethane foam higher in density than soft chip urethane foam is mixed with said soft chip urethane foam. In this manner, the chip material in which chip urethanes different in density are mixed is kneaded with urethane adhesives and then, reacted slowly, compressed into the necessary shape, hardened to the specified density and pressed to obtain a compression molded product finally in which chip urethane foam is uniformly dispersed in urethane resin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a press-molded product of chip urethane foam used for various vehicle parts and the like.

BACKGROUND OF THE INVENTION Urethane foam products obtained by press-molding chip urethane foam have been used in various fields.

The chip urethane foam subjected to this press molding is generally made of soft chip urethane foam as the main raw material. Therefore, the product obtained by press molding such chip urethane foam has a good cushion f1, but its hardness is not high. It was often used as low-hardness parts. In other words, in order to use such pressed products as parts such as high-hardness pads, it is necessary to increase the hardness by compressing them at a considerably high pressure. There was a problem in that the chip urethane foam breath molded product became heavy and lost the advantage of being made of pumice. In addition, in this case, the amount of materials used also increases, resulting in an inconvenience that the cost of the product increases.

On the other hand, when manufacturing urethane bumpers for vehicles, for example, semi-rigid chip urethane foam and hard chip urethane foam are produced as waste materials, and a method for reusing them has been desired from the viewpoint of environmental hygiene and the like.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional circumstances, and provides a press-molded product of chip urethane foam that has high hardness, is lightweight, and can be manufactured at low cost by using waste materials. The purpose is to provide the following.

The constitution of the invention, that is, the press-molded product of chip urethane foam of this invention is made by mixing soft chip urethane foam with at least one of semi-hard chip urethane foam and hard chip urethane foam, and uniformly dispersing this in a urethane resin. It is characterized by:

Contents of the invention The content of this invention will be explained in more detail below.

As described above, this invention uses a soft chip urethane foam mixed with a semi-hard chip urethane foam and/or a hard urethane foam having a higher density than the soft chip urethane foam. As the semi-hard chip urethane foam to be mixed with the soft chip urethane foam, for example, waste materials of urethane bumper forms can be used.

The ratio of semi-hard chip urethane foam and/or hard chip urethane foam to soft chip urethane foam is 11 parts of semi-hard chip urethane foam and 30 parts of hard chip urethane foam to 100 parts of soft urethane foam. It is preferable that the amount is 50 parts by weight or more. If the hardness of the lifting platform product is less than 30 parts by weight, the hardness will be insufficient, and if it exceeds 50 parts by weight, the product will be too small. After kneading with the adhesive (that is, coating the chip with urethane adhesive), it is slowly reacted and compressed into the required shape, and then hardened and cured to the desired density.
By molding, a press-molded product in which chip urethane foam is uniformly dispersed in the urethane resin is finally obtained.

In this invention, it is necessary to mix the above-mentioned chip urethane foams with different densities and to disperse them uniformly. Therefore, as a device for mixing the chip urethane foams and cross-talking them with the urethane adhesive, for example, 2@reciprocal rotation is used. It is preferable to use a screw drum type mixer.

31 Example Examples of this invention are described below.

Soft chip urethane foam (density 0.04~0.05
0/a♂) was used as semi-rigid chip urethane foam, and urethane bumper form waste material (density 0.08
~0.10! + /c/) and urethane adhesive (>30 weight of a blended solution of TOI and PPG) were mixed and press-molded.

For mixing, a twin-axis anti-rotating screw drum type kneader was used to uniformly disperse the above-mentioned materials having different densities. Figure 1 shows an outline of the manufacturing process.

Various tests were conducted on the obtained product to investigate its characteristics. The results are shown in Table 1 in comparison with the characteristics of conventional soft chip urethane foam press molded products.

Similarly, the present invention was carried out to produce press-molded products of various densities, and their 25% hardness was measured. The results are shown in FIG. 2 in comparison with the 25% hardness measurement results of conventional products with various densities.

4-Table 1 As is clear from Table 1, in the case of products with the same hardness, it can be seen that the product of the example has a higher eave than the conventional product.

Furthermore, as is clear from Fig. 2, the hardness of the example is generally higher than that of the conventional product at the same density.For example, if the hardness of the molded product is 14k (1/25c/), is about 26% lighter.

Effects of the Invention As described above, according to the present invention, a press-molded product is manufactured by blending semi-hard chip urethane foam and/or hard chip urethane foam with soft chip urethane foam. A lightweight press-molded product can be produced at low cost, and in particular, waste material from urethane bumper forms can be used as a raw material for the present invention, which is also advantageous in terms of waste disposal.

[Brief explanation of the drawing]

FIG. 1 shows an outline of the manufacturing process of an embodiment of the present invention, and FIG. 2 is a diagram comparing the density and hardness of the pressed product of the embodiment of the invention and a conventional product. Applicant Toyota Motor Corporation Inoue MBC Co., Ltd. Agent Patent Attorney Yutaka 1) Hisashi Takeshi (and 1 other person) 7- (Access S*/b 7'a'% 9th procedure amendment writing method) Showa December 23, 1982 Patent Application No. 140233 2 Title of invention Press molded product of chip urethane foam 3 Relationship to the case of the person making the amendment Patent applicant address 1 Toyota-cho, Toyota-shi, Aichi Prefecture Name Name (320) I-Yota Hakudosha Co., Ltd. (and 1 others)
Name) 4. Agent A 1 Address: 3-4-18-5, Mita, Minato-ku, Tokyo Date of amendment order A 4 7. Contents of amendment (1) Documents certifying authority of representation shall be supplemented. (2) Engraving of drawings (no changes in content)

Claims (1)

[Claims] A press-molded product of chip urethane foam, characterized by mixing soft chip urethane foam with at least one of semi-hard chip urethane foam and hard chip urethane foam, and uniformly dispersing the mixture in urethane resin.