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Molded article and method for production thereof

A technology of molded products and inorganic fillers, applied in the direction of instruments, televisions, optical components, etc., can solve problems such as lack of formability, inaccurate focus, gate blockage, etc., and achieve excellent mechanical strength and dimensional stability Effect

Active Publication Date: 2018-09-28
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for small molded products with thin walls such as lens barrels and holders that make up camera modules used in mobile phones, etc., there is a possibility of misalignment due to slight dimensional changes. Friction at the threaded part of the bracket becomes a problem
Furthermore, since glass flakes and the like are used as fillers, gates and the like are clogged when manufacturing molded products, and good formability may not be obtained.
[0007] Patent Document 4 discloses that a lens barrel and a holder of a camera module obtained by molding a polyamide composition obtained by melting a specific polyamide and a fibrous reinforcement have excellent dimensional anisotropy and detail filling properties. Insufficient dimensional stability for small molded products with thin-walled parts

Method used

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  • Molded article and method for production thereof
  • Molded article and method for production thereof
  • Molded article and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] A sample used for this measurement was prepared by grinding a molded article after it was solidified by settling it in liquid silicone. At this time, it is preferable to use, for example, a grinder such as "SP-150" manufactured by Subtech (Subtec) Co., Ltd., as a standard, to perform rough grinding with No. 400 until the distance to the target cross section is 1 mm, and to use a 800 No. It takes 15 minutes to perform precision grinding until the distance to the target cross section is 0.5mm, and finally use No. 1000 to grind until the target cross section.

[0052]

[0053] The thermoplastic resin composition used in the molded article of the present invention contains a thermoplastic resin (A) and a filler (B), and can be obtained, for example, by kneading components containing a thermoplastic resin (A) and a filler (B).

[0054] 〔Thermoplastic resin (A)〕

[0055] The thermoplastic resin composition used for the molded article of this invention contains a thermoplas...

Embodiment

[0140] Hereinafter, the present invention will be described in more detail using examples and comparative examples, but the present invention is not limited to the following examples.

[0141] In addition, each evaluation of the thermoplastic resin (A) and inorganic filler (B) used in the Example and the comparative example was performed by the method shown below.

[0142] (Average long diameter of inorganic filler (B))

[0143] The volume-based median diameter D50 measured by the laser diffraction scattering method using a particle size distribution measuring device (manufactured by Nikkiso Co., Ltd., model name "MICROTRACK MT3300") was defined as the average major diameter of the inorganic filler (B).

[0144] (average thickness of inorganic filler (B))

[0145] Using an electron microscope (manufactured by KEYENCE Corporation, model name "VE9800"), the SEM image of the inorganic filler (B) was taken, and the 10 plate-shaped filler particles arbitrarily selected on the capt...

manufacture example 1

[0150] According to the composition shown in Table 1, from the hopper at the most upstream part to a twin-screw extruder manufactured by Toshiba Machine Co., Ltd. (screw diameter 26mmφ, L / D=46, rotation speed 150rpm, discharge rate 10kg / h) Components other than the filler (B) were supplied in the middle, and the filler (B) was supplied from a side feeder, and melt-kneaded. The melt-kneaded thermoplastic resin composition is extruded into strands, and cut after cooling to obtain pellets of the thermoplastic resin composition.

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Abstract

The invention provides a molded article obtained by molding a thermoplastic resin composition, wherein the thermoplastic resin composition of the molded article includes a thermoplastic resin (A) andan inorganic filler (B).The content of the inorganic filler (B) is 60-150 parts by mass per 100 parts by mass of the thermoplastic resin (A). The content of a plate-shaped inorganic filler (b1) has anaverage thickness of 4.0 [mu]m or less and an aspect ratio of 130 or higher, in the inorganic filler (B) is 35-100 mass%, and the thickness of the thinnest part is 2.0 mm or less.

Description

technical field [0001] The present invention relates to a molded article obtained by molding a thermoplastic resin composition and a method for producing the same. Specifically, it relates to a molded article having a thin-walled portion having excellent tensile properties, mechanical strength, and dimensional stability, and a method for producing the same, by molding a thermoplastic resin composition. Background technique [0002] Small molded products with thin-walled parts such as lens barrels and holders that make up camera module parts used in mobile phones and the like are prone to deformation such as warping due to molding shrinkage, overheating, or dimensional changes due to water absorption. Therefore, for the purpose of suppressing molding shrinkage and improving dimensional stability and rigidity, molded articles reinforced with fillers such as glass flakes have been proposed. [0003] For example, Patent Document 1 discloses that an amorphous thermoplastic resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/00C08K3/34C08K7/00C08L77/00C08L101/00G02B7/02H04N5/225
CPCC08J5/00C08K7/00C08L77/00G02B7/02C08K2201/005C08K3/34C08K3/40C08K2201/014C08K2201/016C08K9/06C08K9/08C08L77/06C08L69/00C08L67/00C08K2201/003C08J3/203C08J5/005B29C45/0001B29K2077/00B29K2509/08B29K2995/0077B29K2995/0089C08J2377/06C08K2003/343C08K2201/002G02B7/023H04N23/00H04N23/51
Inventor 铃木英昭田村兴造大道裕幸
Owner KURARAY CO LTD