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CN-122003471-A - Injection molded body, method and apparatus for producing injection molded body

CN122003471ACN 122003471 ACN122003471 ACN 122003471ACN-122003471-A

Abstract

The injection molded body 10 includes a matrix resin and a thermoplastic elastomer dispersed in the matrix resin, which includes a first portion 1 distant from a surface 4 of the injection molded body, and a second portion 2 between the first portion 1 and the surface 4, and a ratio of the elastomer to the matrix resin in an area range of 10 2 μm 2 or more and 130 2 μm 2 or less in the second portion 2 is 1.3 times or more a ratio of the elastomer to the matrix resin in an area range of 10 2 μm 2 or more and 130 2 μm 2 or less in the first portion 1.

Inventors

  • USAMI RIEKO
  • OSHIMA YOSHITO
  • Ma Jianxinyaren

Assignees

  • 佳能株式会社

Dates

Publication Date
20260508
Application Date
20240930
Priority Date
20231013

Claims (20)

  1. 1. An injection molded body comprising a matrix resin and a thermoplastic elastomer dispersed in the matrix resin, the injection molded body comprising: a first portion remote from the surface of the injection molded body, and A second portion between the first portion and the surface, Wherein a ratio of the elastomer to the matrix resin in an area range of 10 2 μm 2 to 130 2 μm 2 inclusive in the second portion is 1.3 times or more a ratio of the elastomer to the matrix resin in an area range of 10 to 2 μm 2 to 130 2 μm 2 inclusive in the first portion.
  2. 2. The injection-molded article according to claim 1, Wherein in the first portion, the elastomer is elastomer particles dispersed in the matrix resin, and Wherein in the second portion, the elastomer is elastomer particles dispersed in the matrix resin.
  3. 3. The injection-molded body according to claim 2, wherein an average particle diameter of the elastomer particles in the second portion is larger than an average particle diameter of the elastomer particles in the first portion.
  4. 4. An injection-molded body according to claim 2 or 3, wherein a difference between an average particle diameter of the elastomer particles in the second portion and an average particle diameter of the elastomer particles in the first portion is 0.8 μm or more.
  5. 5. An injection-molded body according to claim 2 or 3, wherein the elastomer particles in the first portion have an average particle diameter of 1.0 μm or less.
  6. 6. An injection molded body according to claim 2 or 3, wherein the elastomer particles in the second part have an average particle diameter of more than 1.0 μm.
  7. 7. An injection-molded body according to claim 2 or 3, wherein the average particle diameter of the elastomer particles in the second portion is twice or more the average particle diameter of the elastomer particles in the first portion.
  8. 8. The injection-molded body according to claim 1 to 3, Wherein the ratio of the elastomer to the matrix resin in the area range of 10 2 μm 2 to 130 2 μm 2 in the second portion is 10% or more, and Wherein the ratio of the elastomer to the matrix resin in the first portion in the area range of 10 2 μm 2 or more and 130 2 μm 2 or less is less than 50%.
  9. 9. The injection-molded body according to claim 1 to 3, Wherein a ratio of the elastomer to the matrix resin in an area range of 10 2 μm 2 to 130 2 μm 2 inclusive in the second portion is 1.5 times or more a ratio of the elastomer to the matrix resin in an area range of 10 to 2 μm 2 to 130 2 μm 2 inclusive in the first portion.
  10. 10. The injection-molded body according to any one of claims 1 to 3, wherein a ratio of the elastomer to the matrix resin in an area range of 10 to 2 μm 2 and 130 to 2 μm 2 in the first portion is an average value in the first portion.
  11. 11. The injection-molded body according to any one of claims 1 to 3, wherein a ratio of the elastomer to the matrix resin in an area range of 10 to 2 μm 2 and 130 to 2 μm 2 in the second portion is a maximum value in the second portion.
  12. 12. An injection molded body according to any one of claims 1 to 3, wherein the first portion is in a region more than 250 μm inward away from the surface, and the second portion is in a region more than 50 μm and less than 500 μm inward away from the surface.
  13. 13. The injection-molded body according to claim 1 to 3, further comprising a third portion between the second portion and the surface, Wherein a ratio of the elastomer to the matrix resin in an area range of 10 2 μm 2 to 130 2 μm 2 inclusive in the third portion is lower than a ratio of the elastomer to the matrix resin in an area range of 10 to 2 μm 2 to 130 2 μm 2 inclusive in the first portion.
  14. 14. The injection molded body of claim 13, wherein the third portion is in a region less than 50 μιη inward away from the surface.
  15. 15. An injection molded body according to any one of claims 1 to 3, wherein the matrix resin is a polyester.
  16. 16. The injection-molded body according to any one of claims 1 to 3, wherein the elastomer is an acrylic elastomer.
  17. 17. An injection molded body according to any one of claims 1 to 3, wherein the melting point of the elastomer is lower than the glass transition point or melting point of the matrix resin.
  18. 18. An injection molded body according to any one of claims 1 to 3, further comprising filler particles dispersed in the matrix resin, the filler particles having an inorganic material as a main component.
  19. 19. A device, comprising: A component consisting of an injection-molded body according to claim 1 to 3, and At least any one of an electrical component, a metal component, and an optical component.
  20. 20. The device of claim 19, wherein the member is an outer body.

Description

Injection molded body, method and apparatus for producing injection molded body Technical Field The present disclosure relates to injection molded bodies, methods and apparatuses for manufacturing injection molded bodies. Background It is known that a resin composition obtained by adding a thermoplastic elastomer to a resin improves mechanical properties such as impact strength. Further, as shown in patent document 1, the compatibility between the resin and the elastomer is improved by adding a compatibilizing agent. This prevents interfacial peeling generated in a simple blended system of resin and elastomer and improves impact strength. CITATION LIST Patent literature Patent document 1 Japanese patent laid-open No. 2011-231165 Disclosure of Invention Technical problem However, the addition of an elastomer and a compatibilizing agent to a resin significantly reduces the flexural modulus of the resin composition, and thus, there are still many problems in order to achieve mechanical properties such as flexural modulus, impact strength, and the like. In the resin composition described in patent document 1, there is room for improvement in mechanical properties, particularly in flexural modulus. Accordingly, an aspect of the present embodiment aims to provide an injection-molded body having excellent mechanical properties. Solution to the problem An injection molded body according to the present disclosure comprising a matrix resin and a thermoplastic elastomer dispersed in the matrix resin comprises a first portion remote from a surface of the injection molded body and a second portion located between the first portion and the surface, wherein a ratio of elastomer to matrix resin in an area range of 10- 2 μm2 and 130- 2 μm2 in the second portion is more than 1.3 times a ratio of elastomer to matrix resin in an area range of 10- 2 μm2 and 130- 2 μm2 in the first portion. Advantageous effects of the invention According to the present embodiment, an injection-molded body having excellent mechanical properties can be provided. Drawings Fig. 1 is a conceptual diagram showing an example of an injection-molded body according to the present embodiment. Fig. 2A is a cross-sectional Scanning Electron Microscope (SEM) image of the injection-molded body according to example 1. Fig. 2B is a cross-sectional Scanning Electron Microscope (SEM) image of the injection-molded body according to example 1. Fig. 3 is a schematic diagram showing an apparatus according to the present embodiment. Detailed Description Embodiments for implementing the present disclosure will be described in detail below. The following embodiments for practicing the present disclosure are illustrated for the purpose of describing the present disclosure, which is not limited to the following. Injection molded article ] The injection-molded body according to the present embodiment is an injection-molded body including a matrix resin and a thermoplastic elastomer dispersed in the matrix resin. Fig. 1 shows a conceptual diagram illustrating an example of an injection-molded body 10 according to the present embodiment. The section 5 of the injection-molded body 10 (which is shown by a section line) is a transverse section of the central portion of the plate-shaped injection-molded body 10. However, the shape of the injection-molded body 10 and the position and shape of the cross section are not particularly limited. For example, the thickness T of the injection-molded body 10 according to the present embodiment may be in the range of 1mm to 5mm, but is not limited thereto. The dimension of the injection-molded body 10 in the direction perpendicular to the thickness direction may be greater than the thickness T, and may be in the range of 10mm to 1000 mm, for example, but is not limited thereto. The injection-molded body 10 shown in fig. 1 comprises a first part 1 remote from the surface 4 of the injection-molded body 10 and a second part 2 located between the first part 1 and the surface 4. Although the first portion 1 and the second portion 2 can be observed in the section 5 of the injection-molded body 10, the injection-molded body 10 includes the first portion 1 and the second portion 2 without cutting the injection-molded body 10. The ratio of elastomer to matrix resin in the area ranges 21 and 22 of 10- 2 μm2 and 130- 2 μm2 in the second part is more than 1.3 times the ratio of elastomer to matrix resin in the area ranges 11 and 12 of 10- 2 μm2 and 130- 2 μm2 in the first part 1. Desirably, the ratio of elastomer to matrix resin in area ranges 21 and 22 is greater than 1.5 times the ratio of elastomer to matrix resin in area ranges 11 and 12. As described above, the first part 1 and the second part 2 are defined by the relationship between the ratio of elastomer to matrix resin. Therefore, the first portion 1, which is a portion where the ratio of the elastomer to the matrix resin is relatively low, may be referred to as a "low ratio portion". The seco