Composite and molded product thereof

A technology for composites and molded products, which can be used in shielding materials, electrical components, magnetic field/electric field shielding, etc., and can solve problems such as peeling and cost increase

Inactive Publication Date: 2014-08-06
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although ordinary high-rigidity resins are subjected to conductive plating to reduce surface resistance in order to solve the above-mentioned problems, there is a problem of cost increase due to plating, post-processing, etc., and resins may suffer from surface peeling after long-term use

Method used

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  • Composite and molded product thereof
  • Composite and molded product thereof
  • Composite and molded product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 9 and comparative example 1 to 9

[0138] The components were mixed in the amounts listed in Table 1 and Table 2 in a conventional mixer, followed by extrusion using a twin-screw extruder with L / D = 35 and Φ = 45 mm, and prepared into pellets. The prepared pellets were dried at 100°C for 4 hours, followed by preparation of samples for testing properties and evaluating EMI and resistivity at an injection molding temperature of 290°C. The samples were left to stand at 23°C and 50% RH for 48 hours, and then their properties were measured according to ASTM standards.

[0139] property assessment

[0140] (1) Flexural modulus: The flexural modulus was measured at 2.8 mm / min on a 6.4 mm thick sample according to ASTM D790 (unit: GPa).

[0141] (2) Specific gravity: The specific gravity is measured according to ASTM D792.

[0142] (3) Spiral flow: The pellets are molded in a spiral mold with a thickness of 2mm at a molding temperature of 320°C and a mold temperature of 60°C at an injection pressure of 50% and an inj...

Embodiment 10 to 14 and comparative example 10 to 12

[0158] Examples 10 to 14 and Comparative Examples 10 to 12: Use of surface-treated carbon fibers

[0159] The same procedures as in Examples 1 to 9 and Comparative Examples 1 to 9 were performed except that the amounts of the components as listed in Table 3 and Table 4 were changed. The prepared samples were evaluated according to the following properties.

[0160] (1) Flexural modulus: The flexural modulus was measured at 1.4 mm / min on a sample with a thickness of 3.2 mm in accordance with ASTM D790 (unit: GPa).

[0161] (2) Specific gravity: The specific gravity is measured according to ASTM D792.

[0162] (3) Spiral flow: The pellets were injection molded in a spiral mold of 2mm thickness at a molding temperature of 320°C and a mold temperature of 60°C at an injection pressure of 50% and an injection rate of 70% using a 6oz injection molding machine system, and then measure the length (unit: mm) of the injection molded product.

[0163] 4) EMI shielding property: The sam...

Embodiment 15 to 20 and comparative example 13 to 15

[0173] Examples 15 to 20 and Comparative Examples 13 to 15: Use of functional group-containing impact modifiers

[0174] The same procedures as in Examples 1 to 9 and Comparative Examples 1 to 9 were performed except that the amounts of the components as listed in Table 5 and Table 6 were changed. The prepared samples were evaluated according to the following properties.

[0175] (1) Flexural modulus: The flexural modulus was measured at 1.4 mm / min on a sample with a thickness of 3.2 mm in accordance with ASTM D790 (unit: GPa).

[0176] (2) Specific gravity: The specific gravity is measured according to ASTM D792.

[0177] (3) Izod impact strength (unnotched): Izod impact strength was measured at 23° C. on a 3.2 mm thick sample according to ASTM D256 (unit: kgf·cm / cm).

[0178] (4) Spiral flow: The pellets are injected in a spiral mold of 2mm thickness at a molding temperature of 320°C and a mold temperature of 60°C at an injection pressure of 50% and an injection rate of 70...

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Abstract

A composite of the present invention comprises: (A) about 10-84 wt% of a thermoplastic resin; (B) about 5-35 wt% of a first filler; (C) about 1-20 wt% of a second filler; and (D) about 10-60 wt% of a third filler, wherein the third filler (D) is a conductive filler, and the melting points of the thermoplastic resin (A), the first filler (B) and the second filler (C) satisfy the following relation 1: [Relation 1] Tma-30 DEG C > Tmb, Tma+500 DEG C < Tmc (wherein, Tma is the melting point ( DEG C) of the thermoplastic resin (A), Tmb is the melting point ( DEG C) of the first filler (B), and Tmc is the melting point ( DEG C) of the second filler (C)).

Description

technical field [0001] The present invention relates to a composite and moldings thereof. More particularly, the present invention relates to a high-rigidity electromagnetic shielding compound and molded product thereof, which compound has excellent processability and can replace existing metal materials by securing excellent mechanical strength and EMI shielding properties to Reduce manufacturing costs. Background technique [0002] Electromagnetic waves are noise generated by electrostatic discharge, and are known to not only adversely affect the human body, but also cause surrounding parts or devices to suffer from noise and malfunction. Recently, the possibility of electromagnetic wave generation has rapidly increased due to high efficiency, high power consumption, and high integration of electric / electronic products, and regulations on electromagnetic waves are being strengthened in many countries including Korea. [0003] Generally, metal materials have been used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/12C08K3/08C08K7/02C08J5/00H05K9/00
CPCC08J3/20C08K7/02H05K9/009C08K3/08C08L101/12C08J2300/22H05K9/0083H05K9/0086
Inventor 朴志权林润淑韩在铉朴康烈
Owner CHEIL IND INC
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