JP2926878B2 - Hollow plastic - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hollow plastic in which a number of dense hollow portions can be formed.

[Prior Art] Conventionally, there is a foamed plastic as an example of a hollow plastic. In this foamed plastic, for example, water is mixed with a liquid plastic and cooled to form a hollow state. In addition, a foaming agent is mixed into the resin, and the resin is heated in a mold or the like to foam the foaming agent to form the resin.

[Problems to be Solved by the Invention] However, even if foamed plastic is hollow, the size of holes in the hollow portion is considerably large and uneven, and rigidity is low. There is a problem that it is very narrow and cannot be used, for example, for a car body or an outer panel.

The present invention has been made in view of the above circumstances, and has as its object to provide a foamed plastic which is rigid and can be used for various applications.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for forming capsule particles by forming parent particles and child particles with resins having different melting points, and bonding the child particles to the parent particles. Granules are formed, the capsule powders are aggregated, and only the low melting point resin is melted.

[Operation] According to the above configuration, the capsule powder is formed of resin having different melting points, and the resin having a low melting point in the capsule powder is melted. A uniform hollow portion can be formed, thereby reducing the weight. The hollow portion serves as a cushion, so that there is little deformation with respect to a material having a high linear expansion coefficient, and also soundproof, pressure-proof, heat-proof, water absorption, water repellency, etc. It can be used for various applications.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an enlarged sectional view of a capsule powder 10 for molding the hollow plastic of the present invention.

First, the capsule powder 10 is formed, for example, on a surface of a parent particle 11 having a particle diameter of 100 μ or less, for example, a large number of child particles 12 having a particle diameter of 10 μ or less.
Is formed by adhering and fixing. The formation of the capsule particles 10 can be carried out in a state in which the child particles 12 are electrostatically attached to the parent particles 11 or by a high-speed air impact method as disclosed in Japanese Patent Application Laid-Open No. 62-250942. Fix more securely by mechanical shock method.

The parent particles 11 and the child particles 12 are formed of resins having different melting points, and one of them is formed of a low melting resin and the other is formed of a high melting resin. Examples of the low melting point resin include polypropylene PE (melting point 100 ° C) and polypropylene PP (150 ° C). Examples of the high melting point resin include polyetheretherketone PEEK (melting point 300 ° C) and nylon PA (200 ° C). Become.

Now, the parent particles 11 are formed of a low-melting-point resin, and the child particles 12 are formed of a high-melting-point resin to form a capsule granular material 10. The capsule granular material 10 is assembled as shown in FIG. Then, the mixture is heated to a temperature at which the parent particles 11 as the low-melting point resin are melted and molded. When the parent particle 11 melts, the parent particle 11 becomes a child particle 12
And is integrated with the adjacent parent particles 11 and, at the same time, as shown in FIG.
However, the dense hollow plastic 14 left as it is is molded. The hollow portion 13 is smaller than the capsule granule 10, and the size of the hollow portion 13 can be adjusted by selecting the particle size of the parent particle 11 and the child particle 12.

In the above-described embodiment, the parent particles 11 are formed of a low-melting resin. However, the child particles 12 may be formed of a low-melting resin to form the capsule particles 10.

4 to 6 show another embodiment of the present invention.

In this example, the parent particles 11 are formed of a low-melting-point resin, the child particles 12 are formed of a high-melting-point resin, and fine iron powder 15 is attached to the surface of the child particles 12 as shown in FIG. In this state, the child particles 12 are adhered to the parent particles 11 as shown in FIG.
Are put in a form (not shown) or the like as shown in FIG. 5 and assembled.
The child particles 12 around are melted and the child particles 12 are welded to each other.After that, the child particles 12 are melted at a temperature lower than the melting temperature and higher than the melting temperature of the parent particles 11, and the parent particles 11 are melted and melted by suction or the like. By removing the parent particles 11, as shown in FIG. 6, a porous hollow plastic molded body comprising a hollow portion 17 from which the parent particles 11 have been removed and a hollow portion 13 between the capsule powder granules 16
It can be 18.

[Effects of the Invention] As is clear from the above description, according to the present invention, the following excellent effects are exhibited.

(1) Capsule particles are formed from resins having different melting points, and a low melting point resin in the capsule particles is melted to form a uniform hollow portion between the capsule particles.
As a result, the weight can be reduced, and the hollow portion serves as a cushion, so that less deformation is required for a material having a high linear expansion coefficient.

(2) It has effects such as soundproofing, pressure-proofing, heat-proofing, water absorption and water repellency, and can be used for various applications.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing one embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a state of molding using the capsule powder of FIG. 1, and FIG. FIG. 4 is an enlarged cross-sectional view of a molded body, FIG. 4 is an enlarged cross-sectional view showing another embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view showing a state at the time of molding using the capsule granular material of FIG. FIG. 6 is an enlarged sectional view of the molded body after the molding. In the figure, 10 is a capsule powder, 11 is a parent particle, 12 is a child particle,
13 is a hollow part.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobuo Yagi, No. 8 clay bowl, Fujisawa, Kanagawa Prefecture Isuzu Central Research Institute Co., Ltd. (72) Takashi Hino, No. 8 clay bowl, Fujisawa City, Kanagawa Prefecture Isuzu Motors Limited Fujisawa In the factory (72) Inventor Naotaka Yamamoto 8 Dosana, Fujisawa-shi, Kanagawa Pref.Isuzu Central Research Institute Co., Ltd. (72) Inventor Hidetaka Shibata 8 Dosana, Fujisawa-shi, Kanagawa Pref. Isuzu Central Research Co., Ltd. (72) Invention Person Akira Ibuki 3-25-1, Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Isuzu Motor Co., Ltd. Kawasaki Plant (72) Inventor Mutsumi Nishimoto 8 Tsuzuna, Fujisawa City, Kanagawa Prefecture Isuzu Motors Fujisawa Plant (72) Invention Tokuo Yamashita 8 Tsuchin, Fujisawa-shi, Kanagawa Prefecture Isuzu Central Research Institute Co., Ltd. (72) Inventor Masayuki Munemura God 8 Isuzu Central Research Institute, Fujisawa-shi, Kawasaki, Japan (72) Inventor Eiichi Nakagawa 8 Edoshana Fujisawa-shi, Kanagawa Prefecture, Japan Inside Isuzu Central Research Institute, Inc. (72) Inventor Tadashi Uemura, Tsuchiya, Fujisawa-shi, Kanagawa No. 8 Inside Isuzu Central Research Laboratory Co., Ltd. (56) References JP-A-60-8332 (JP, A) JP-A-50-98973 (JP, A) JP-A-48-25064 (JP, A) (58) Field surveyed (Int.Cl. ⁶ , DB name) C08J 9/24-9/26 C08J 3/12 B29C 67/20

Claims (1)

(57) [Claims] A parent particle and a child particle are formed of resins having different melting points, and the child particle is adhered and bonded to the parent particle to form a capsule powder. A hollow plastic obtained by melting and molding a side resin.