JP2004075964A - Synthetic resin composition containing scallop shell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology utilizing excellent characteristics originally owned by scallop shells which are generated in a large amount as industrial wastes. <P>SOLUTION: A crushed material having a size of 0.1-500μm obtained by crushing scallop shells is incorporated in an amount of 1-250 pts.wt. into a synthetic resin in an amount of 100 pts.wt. to give a synthetic resin composition having excellent mechanical characteristics. <P>COPYRIGHT: (C)2004,JPO

Description

【００２４】
【発明の効果】
以上、説明したように本発明の請求項１〜４記載のホタテ貝殻粉砕物含有合成樹脂組成物は、ホタテ貝殻粉砕物がアスペクト比を有するため、合成樹脂に含有することにより強化材として成形品の機械的物性を向上させる。また、ホタテ貝殻粉砕物の表面はコンキオリンが被覆されているため、合成樹脂とのぬれ性がよく、強化材としての補強効果が充分に発現される。さらに、産業廃棄物として大量に発生するホタテ貝殻の有効利用がはかられるという優れた効果を奏し得る。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a synthetic resin composition containing a crushed scallop shell as a filler.
[0002]
[Prior art]
The amount of scallop production is increasing year by year, and a large amount of shells are left as processed residues. Conventionally, many of these shells have been landfilled as industrial waste, but in recent years they have been used as quicklime, slaked lime, food additives, cement raw materials and the like.
[0003]
[Problems to be solved by the invention]
However, as described above, scallop shells are used only as a raw material for calcium, and do not fully utilize the inherent properties of shells.
[0004]
In view of such circumstances, the inventors of the present invention have an object to provide a new technical means that can effectively utilize scallop shells, and as a result of intensive studies, the scallop shell crushed product is contained in a synthetic resin. And a reinforcing effect was obtained as a reinforcing material, and a new finding of improving the rigidity and strength of the synthetic resin molded article was obtained.
[0005]
In addition, inorganic fillers, which are often used as fillers for synthetic resins, are poor in wettability with synthetic resins due to their hydrophilic surface, and the reinforcing effect of the fillers cannot be sufficiently obtained. Therefore, it is common to use a surface modifier to improve the wettability. However, the surface of the ground scallop shell is covered with conchiolin and has good wettability with synthetic resin, and these surface modification agents are used. New knowledge that a sufficient reinforcing effect can be obtained without performing the above.
[0006]
[Means for Solving the Problems]
The present invention relates to a synthetic resin composition characterized by containing a scallop shell crushed product in a synthetic resin.
[0007]
A preferred embodiment of the present invention is a scallop shell-containing synthetic resin composition, wherein 100 parts by weight of the synthetic resin contains 1 to 250 parts by weight of a crushed scallop shell having a particle size of 0.1 to 500 μm. It is a shell-containing synthetic resin composition. Hereinafter, the present invention will be described in detail.
[0008]
The scallop shell is composed of the crystal structure of calcium carbonate, but since it contains an organic matrix protein called conchiolin, its strength is 2000 times that of pure inorganic crystals. In addition, the crystal structure of calcium carbonate grows in one direction as the shell grows, so the mechanical properties of the entire shell are anisotropic, and when crushed, the aspect along the growth direction cannot be obtained by other shells. A bar-shaped pulverized product having a specific ratio is obtained.
[0009]
The crushed scallop shell used in the present invention is obtained by the following method. In other words, shells and uro are removed from the fishery processing plant, and the shells discharged are crushed, and foreign matter such as marine organisms, seaweed, and sand are separated and removed, then classified, and those of a required size are washed. It is obtained by drying. Pulverization can be performed by a general pulverizer using a pulverizing force such as impact, compression and friction, such as a hammer mill, a roller mill, a ball mill, and a jet mill, but particularly, rod-shaped particles having a characteristic aspect ratio are prepared. For this purpose, a pulverizing method having a strong shearing force is desirable. In addition, by performing a classification operation such as dry or wet sieving or airflow classification on the pulverized powder, the size of the particles can be controlled, and rod-like particles having a large aspect ratio can be more selectively formed. Shape control such as recovery or concentration is possible.
[0010]
The content of the ground scallop shell obtained by the above method with respect to the synthetic resin is preferably 1 to 250 parts by weight based on 100 parts by weight of the synthetic resin. If it is less than 1 part by weight, a reinforcing effect for improving mechanical properties cannot be obtained. On the other hand, when the amount exceeds 250 parts by weight, it is difficult to contain the pulverized material in the synthetic resin. The particle size of the crushed scallops is preferably from 0.1 to 500 μm. If it is less than 0.1 μm, a sufficient reinforcing effect for improving mechanical properties cannot be obtained. On the other hand, if it exceeds 500 μm, the pulverized material cannot form an aspect ratio necessary for reinforcement, and a sufficient reinforcing effect cannot be obtained. Furthermore, it does not disperse uniformly in the synthetic resin, and the mechanical properties of the molded product vary. When they are contained, those having substantially the same particle diameter may be used, or those having different particle diameters may be mixed and used.
[0011]
In the present invention, the synthetic resin may be either a thermoplastic synthetic resin or a thermosetting synthetic resin. Examples of the thermoplastic synthetic resin include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyamide, polycarbonate, polyacetal, polyethylene terephthalate, and polybutylene terephthalate. Examples of an apparatus for containing the crushed scallops in the thermoplastic synthetic resin include a single-screw extruder, a twin-screw extruder, a kneader, a Banbury mixer, a two-roll mill, and a Brabender. As a method for molding a synthetic resin composition containing these ground scallop shells into a molded article, any method can be used as long as it is a method for molding a commonly used thermoplastic resin such as injection molding and press molding. it can. Examples of the thermosetting synthetic resin include an unsaturated polyester resin, an epoxy resin, and a phenol resin. As a method for containing the ground scallop chased material in the thermosetting synthetic resin, it is kneaded sufficiently with a mixer or the like to form a uniform mixture, which is poured into a molding die of the required shape, and cured specifically for the selected resin. After curing according to the conditions, the mold is released.
[0012]
In the present invention, when kneading a scallop shell pulverized material and a synthetic resin to produce a scallop shell pulverized material-containing synthetic resin, it is usually used to improve the wettability of the interface in the kneading step of the inorganic powder and the synthetic resin. , Coupling agents, stearic acid, etc. need not be added. Since the surface of the scallop shell is covered with conchiolin, it has good wettability with the synthetic resin, and the ground scallop shell is uniformly dispersed in the composition.
[0013]
According to the above means, the following effects can be obtained.
[0014]
[Action]
Since the scallop shell crushed material has an aspect ratio, it fills in a synthetic resin to act as a reinforcing material, thereby improving the mechanical properties of the molded product. In addition, since the surface of the crushed scallops is coated with conchiolin, it has good wettability with the synthetic resin, is uniformly dispersed in the composition, and exhibits sufficient action as a reinforcing material.
[0015]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
Example 1
100 parts by weight of an unsaturated polyester resin (Nippon Yupika 6424), 50 parts by weight of a crushed scallop shell having an average particle size of 2 μm, and 1 part by weight of a hardener (Nippon Yushi Paroyl TCP) are mixed and heated at 80 ° C. for 1 hour to form a flat plate. Obtained. The obtained flat plate was formed into a tensile test piece and a bending test piece according to JIS K7113 and JIS K7171, and physical properties were evaluated. The results are shown in Table 1.
[0016]
Comparative Example 1
A method similar to that of Example 1 except that 100 parts by weight of an unsaturated polyester resin (Nippon Yupika 6424) and 50 parts by weight of heavy calcium carbonate (NS # 100 Nitto Powder Chemical Co., Ltd.) having an average particle size of 2 μm are mixed. And a physical property evaluation was performed. The results are shown in Table 1.
[0017]
Comparative Example 2
A test piece was obtained in the same manner as in Example 1 except that 100 parts by weight of an unsaturated polyester resin (Nippon Yupika 6424) and 50 parts by weight of a crushed scallop shell having an average particle diameter of 0.05 μm were mixed, and physical properties were evaluated. Was. The results are shown in Table 1.
[0018]
Comparative Example 3
A test piece was obtained in the same manner as in Example 1 except that 100 parts by weight of an unsaturated polyester resin (Nippon Yupika 6424) and 50 parts by weight of a crushed scallop shell having an average particle diameter of 1 mm were mixed, and physical properties were evaluated. The results are shown in Table 1.
[0019]
Comparative Example 4
A test piece was obtained in the same manner as in Example 1 except that 100 parts by weight of an unsaturated polyester resin (Nippon Yupika 6424) and 0.5 part by weight of a crushed scallop shell having an average particle size of 2 μm were mixed, and physical properties were evaluated. Was. The results are shown in Table 1.
[0020]
Comparative Example 5
An attempt was made to mix 100 parts by weight of an unsaturated polyester resin (Nippon Yupika 6424) with 300 parts by weight of a crushed scallop shell having an average particle diameter of 2 μm, but no uniform mixture was obtained.
[0021]
Comparative Example 6
A test piece was obtained from only 100 parts by weight of the unsaturated polyester resin (Nippon Yupica 6424) and the physical properties were evaluated. The results are shown in Table 1.
[0022]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the spirit of the present invention.
[0023]
[Table 1]

[0024]
【The invention's effect】
As described above, the scallop shell pulverized product-containing synthetic resin composition according to claims 1 to 4 of the present invention is a molded article as a reinforcing material by being contained in a synthetic resin because the scallop shell pulverized material has an aspect ratio. Improve the mechanical properties of In addition, since the surface of the crushed scallops is coated with conchiolin, the wettability with the synthetic resin is good, and the reinforcing effect as a reinforcing material is sufficiently exhibited. Furthermore, there is an excellent effect that scallop shells generated in large quantities as industrial waste can be effectively used.

Claims (4)

A synthetic resin composition comprising a scallop shell crushed product in a synthetic resin. The synthetic resin composition according to claim 1, wherein the scallop shell is contained in an amount of 1 to 250 parts by weight based on 100 parts by weight of the synthetic resin. The synthetic resin composition according to claim 1, wherein the synthetic resin contains a crushed scallop shell having a particle size of 0.1 to 500 µm. The synthetic resin composition according to claim 1, wherein the composition contains 1 to 250 parts by weight of a crushed scallop shell having a particle diameter of 0.1 to 500 µm based on 100 parts by weight of the synthetic resin.