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Composite resin molded product for acoustic member

A technology of composite resin and molded body, applied in the direction of transducer shell/cabinet/support, etc., can solve the problems of large environmental load, expensive engineering plastics, and difficulty in monomer recovery.

Pending Publication Date: 2021-12-17
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, engineering plastics have issues such as expensive, difficult to recycle monomers, and heavy environmental load.

Method used

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  • Composite resin molded product for acoustic member
  • Composite resin molded product for acoustic member
  • Composite resin molded product for acoustic member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0041] figure 1 It is a schematic perspective view showing the internal structure of the composite resin molded body 10 according to the first embodiment. Figure 2A It is a schematic diagram of the fibrous filler 2 as a constituent member of the composite resin molded body of the first embodiment. Figure 2B is included Figure 2A A partial enlarged view of the end 5 of the fibrous filler.

[0042] The composite resin molded body 10 of Embodiment 1 includes a melt-kneaded product containing the main ingredient resin 1 , the fibrous filler 2 , and the additive 3 . The composite resin molded body 10 such as figure 1 As shown in the schematic perspective view of , the fibrous filler 2 and the additive 3 are dispersed in the main ingredient resin 1 . The concentration of the fibrous filler 2 in the composite resin molded body 10 is 50% by weight or more. In addition, in the composite resin molded body 10 , the crystallinity of the main ingredient resin 1 around the fibrous f...

Embodiment 1

[0069] In Example 1, a pulp-dispersed polypropylene composite resin molded body was produced by the following production method.

[0070] (1) As a starting material of the fibrous filler, conifer pulp (trade name: NBKP Celgar, manufactured by Mitsubishi Paper Co., Ltd.) was used. The conifer pulp was pulverized with a pulverizer to obtain a fibrous filler. Regarding end defibrillation, adjustments were made by the crushing process.

[0071] (2) A mixture of polypropylene (trade name: J108M, manufactured by Prime Polymer Co., Ltd.) as the main ingredient resin, and the above-mentioned fibrous filler, and maleic anhydride (trade name: Umex, manufactured by Sanyo Chemical Industry Co., Ltd.) as an additive were prepared as follows: The main ingredient resin, the fibrous filler, and the additive were weighed so that the weight ratio would be 42.9:55.0:2.1, and dry-blended.

[0072] (3) Next, melt-kneading and dispersion were performed using a twin-screw kneader (KRC kneader manu...

Embodiment 2

[0081] In Example 2, the fibrous filler concentration was changed to 70% by weight, and the main ingredient resin was changed to 27.9% by weight. Except for the material conditions and process conditions, pulp-dispersed polypropylene pellets were produced in the same manner as in Example 1. materials and shaped bodies. About evaluation, the same evaluation as Example 1 was implemented.

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Abstract

A composite resin molded product for an acoustic member contains a main agent resin and fibrous fillers dispersed in the main agent resin, and a concentration of the fibrous fillers is 50% by weight or more in the composite resin molded product, and crystallinity of the main agent resin around the fibrous fillers is higher than crystallinity of the main agent resin in other parts in the composite resin molded product.

Description

technical field [0001] The present invention relates to a composite resin molded body for an acoustic member (Japanese: acoustic member; English: acoustic member) capable of realizing a molded body having excellent acoustic properties. Background technique [0002] So-called "general purpose plastics" such as polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC) are not only very cheap, but also easy to shape, weighing several pounds compared to metals or ceramics. One part is lightweight. Therefore, general-purpose plastics are often used as materials for various daily necessities such as bags, various packaging, various containers, sheets, etc. In addition, they are frequently used as materials for industrial parts such as automobile parts and electrical parts, as well as materials for daily necessities and miscellaneous goods. . [0003] However, general-purpose plastics have disadvantages such as insufficient mechanical strength. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/04C08L23/12C08L1/02H04R1/02
CPCC08J5/045H04R1/02C08J2301/02C08J2423/12B29B7/002B29B7/90B29K2995/0001B29C45/0001B29C45/0005B29K2105/12B29K2511/14B29K2311/14B29K2023/12B29K2511/10B29K2023/06B29C45/0013
Inventor 浜边理史今西正义名木野俊文西野彰马
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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