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JP-7855281-B1 - Synthetic resin composition, synthetic resin molded article, and helmet

JP7855281B1JP 7855281 B1JP7855281 B1JP 7855281B1JP-7855281-B1

Abstract

[Problem] To effectively utilize seashells as a resource, and to obtain a synthetic resin composition and synthetic resin molded product that has a unique texture and excellent strength. [Solution] The synthetic resin composition according to the present invention is a synthetic resin composition comprising a synthetic resin and crushed seashells in a mass ratio of 98:2 to 25:75, wherein the crushed seashells comprises finely crushed seashells with an average particle size of 1 μm or more and less than 100 μm, and coarsely crushed seashells with an average particle size of 100 μm or more and 3000 μm or less, in a mass ratio of 97:3 to 40:60. The synthetic resin molded article according to the present invention is formed by molding the synthetic resin composition into a predetermined shape. [Selection Diagram] Figure 1

Inventors

  • 南原 徹也

Assignees

  • 甲子化学工業株式会社

Dates

Publication Date
20260508
Application Date
20251003

Claims (5)

  1. A synthetic resin composition comprising synthetic resin and crushed seashells in a mass ratio of 45:55 to 85:10 , A synthetic resin composition wherein the crushed seashell material contains finely crushed seashell material with an average particle size of 1 μm or more and less than 100 μm, and coarsely crushed seashell material with an average particle size of 100 μm or more and 3000 μm or less, in a mass ratio of 7:3 to 46:9 .
  2. The synthetic resin composition according to claim 1, wherein the average particle size of the finely ground seashell material is 10 μm or more and 30 μm or less.
  3. A synthetic resin molded article obtained by molding the synthetic resin composition described in claim 1 or 2 into a predetermined shape.
  4. A helmet made by molding a synthetic resin composition containing synthetic resin and crushed seashells in a mass ratio of 98:2 to 25:75, wherein the crushed seashells consist of finely crushed seashells with an average particle size of 1 μm or more and less than 100 μm, and coarsely crushed seashells with an average particle size of 100 μm or more and 3000 μm or less, in a mass ratio of 97:3 to 40:60 , the helmet having a plurality of protrusions extending in the front-to-back direction on its outer surface.
  5. A shell crushing process to obtain fine shell crushing material with an average particle size of 1 μm or more and less than 100 μm, and coarse shell crushing material with an average particle size of 100 μm or more and 3000 μm or less, by crushing seashells, A synthetic resin composition production step, which involves mixing the finely ground seashell material and the coarsely ground seashell material with a molten synthetic resin to obtain a synthetic resin composition, It has, In the synthetic resin composition production step, the ratio of the mass of the synthetic resin to the total mass of crushed seashells, which is the sum of the mass of the finely crushed seashells and the mass of the coarsely crushed seashells added to the synthetic resin, is 45:55 to 85:10 , and the ratio of the mass of the finely crushed seashells to the mass of the coarsely crushed seashells in the total mass of crushed seashells is 7:3 to 46:9 . A method for producing a synthetic resin composition.

Description

This invention relates to a synthetic resin composition, a synthetic resin molded article, and a helmet. Large quantities of shellfish, such as scallops, oysters, and pearl oysters, are generated as waste from marine resources. These shells are piled up on land while awaiting disposal through landfill or other means, but securing storage space and the environmental impact are problematic. Japanese Patent Publication No. 2004-75964 A flowchart showing the manufacturing process of a synthetic resin composition according to one embodiment of the present invention.A perspective view showing a helmet according to one embodiment of the present invention. The inventors, after diligent research to solve the above problems, discovered that by adding two types of crushed seashells with different particle sizes to a synthetic resin in a predetermined ratio, a synthetic resin composition with a unique texture and excellent strength can be obtained, leading to the present invention. In other words, the synthetic resin composition according to one embodiment of the present invention is a synthetic resin composition comprising a synthetic resin and crushed seashells in a mass ratio of 98:2 to 25:75 (preferably 97:3 to 45:55), wherein the crushed seashells consist of finely crushed seashells with an average particle size of 1 μm or more and less than 100 μm (preferably 10 μm or more and 30 μm or less) and coarsely crushed seashells with an average particle size of 100 μm or more and 3000 μm or less, in a mass ratio of 97:3 to 40:60 (preferably 90:10 to 70:30). Furthermore, in the synthetic resin composition according to one embodiment of the present invention, the coarsely ground seashell material preferably consists of a first coarsely ground material having an average particle size of 100 μm or more and less than 1000 μm, and a second coarsely ground material having an average particle size of 1000 μm or more and 3000 μm or less, with a mass ratio of 1:99 to 99:1 between the first and second coarsely ground materials. The synthetic resin composition according to this embodiment can be manufactured by a manufacturing method comprising: a shell crushing step to obtain finely crushed shell material and coarsely crushed shell material by crushing seashells; and a synthetic resin composition manufacturing step to obtain a synthetic resin composition by adding and mixing the finely crushed shell material and coarsely crushed shell material to a molten synthetic resin (Figure 1). The finely ground seashell material and the coarsely ground seashell material may be obtained in the seashell material production process by crushing the seashells separately, or the coarsely ground seashell material may be obtained by roughly crushing the seashells, and then the finely ground seashell material may be obtained by further crushing a portion of the coarsely ground seashell material. The coarsely ground seashell material can be obtained by crushing the seashells, for example, with a hammer crusher or jaw crusher, and the finely ground seashell material can be obtained by crushing the seashells or the coarsely ground seashell material, for example, with a roller mill or vibro mill, but is not limited to these. Alternatively, in the seashell material production process, seashell material of various particle sizes may be obtained by crushing the seashells with predetermined means, and the finely ground seashell material and the coarsely ground seashell material may be obtained by grouping (i.e., classifying) them based on their size. The type of seashell is not limited, but for example, scallop, oyster, clam, abalone, or pearl oyster shells can be used. In particular, it is desirable to use scallop shells, as they produce a large amount of shell waste. Furthermore, if the seashells are derived from marine mollusks, it is desirable to obtain the crushed seashell material by immersing the shells in fresh water for a predetermined period (e.g., 1 to 3 years) to remove the salt, and then crushing them. It is also desirable to disinfect the seashells by boiling or other means before crushing them. In the process of producing the crushed seashell material, the seashells may be crushed after calcination, but it is preferable to obtain the finely crushed seashell material and the coarsely crushed seashell material by crushing uncalcined seashells. This allows for the effective utilization of organic components (e.g., proteins) attached to the seashells as constituent components of the synthetic resin composition according to this embodiment. The finely ground seashell material contained in the synthetic resin composition according to this embodiment primarily functions as a reinforcing material to improve the mechanical properties (e.g., flexural modulus) of the synthetic resin molded product obtained from the synthetic resin composition, while the coarsely ground seashell material primarily functions as a design-enhancing material that affects the