Polyamide 6, 6 resin composition having toughness abrasion resistance and frictional resistance

A technology of resin composition and polyamide, applied in the direction of components with teeth, belts/chains/gears, mechanical equipment, etc., can solve the problems of reduced toughness, increased fracture, poor metal friction characteristics, etc., and achieve the effect of excellent toughness

Active Publication Date: 2018-02-23
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When general inorganic additives are used, tensile elongation becomes poor and toughness decreases, so fracture increases
[0005] Research to improve impact strength and tensile strength by blending polyamide resin and polyolefin resin has been conducted, but friction characteristics against metal are poor, so there is a problem with using this material as a worm gear material

Method used

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  • Polyamide 6, 6 resin composition having toughness abrasion resistance and frictional resistance
  • Polyamide 6, 6 resin composition having toughness abrasion resistance and frictional resistance
  • Polyamide 6, 6 resin composition having toughness abrasion resistance and frictional resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3 and comparative Embodiment 1 to 8

[0056] Examples 1 to 3 and Comparative Examples 1 to 8: Preparation of polyamide 6,6 resin composition

[0057] The components were mixed at the composition ratio shown in Table 1 below to prepare a polyamide 6,6 resin composition.

[0058]

[0059] Ultra high viscosity polyamide 6,6: Relative viscosity measured by ASTM D789, Invista HV240A NC01 is 240.

[0060] High viscosity polyamide 6,6 (high viscosity): The relative viscosity measured by ASTM D789, Invista HV125A NC01 is 125.

[0061] PE-g-MA: partially polarized PE, GR-216 (product of Dow Chemical Company), m.p. 145°C, specific gravity 0.88, MI 1.3 g / 10min.

[0062] EPDM-g-MA: partially polarized EPDM, 416D (product of Dupont), m.p.43°C, specific gravity 0.87, MI 23g / 10min.

[0063] S-EBS-g-MA: partially polarized S-EBS, FG1901 (product of Kraton Corporation), MI 14 to 28 g / 10 min.

[0064] Nanoclay: layered bentonite, Cloisite 20 (product of BYK), d 50 <10 μm, bentonite salt of bis(hydrogenated tallow alkyl)dimeth...

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Abstract

The present invention relates to a polyamide 6,6 resin composition which exhibits an effect of simultaneously improving toughness, frictional resistance and abrasion resistance by including a graft copolymer of polyethylene and maleic anhydride, a layered nanoclay and a flake type talc in a base resin of polyamide 6,6 with an ultrahigh viscosity at a predetermined composition ratio. The polyamide6,6 resin composition according to the present invention is usefully used as material of a worm gear for an electric power steering device by having physical properties including 83 Mpa or more of tensile strength (ISO527), 30% or more of an elongation at break (ISO527), 0.30 or less of a dynamic frictional coefficient of steel to metal measured by a ring-on-ring friction and abrasion tester, and0.020 mm3 / Kgfkm or less of a specific wear rate.

Description

technical field [0001] The present invention relates to polyamide 6,6 resin compositions having simultaneously improved toughness, abrasion resistance and frictional resistance. In the composition having an ultrahigh viscosity, a graft copolymer of polyethylene and maleic anhydride, a layered nanoclay, and a nucleating agent are contained in a predetermined composition ratio. Background technique [0002] A Motor Driven Power Steering (MDPS) worm gear is the device that transmits the power of the motor to the wheels when the steering wheel is turned. Worm gears made of plastic are constantly subjected to high loads and friction transmitted from metal worm gears, so high elongation and strength are required, as well as excellent friction against metal. As a gear material, polyamide resin is mainly used. Polyamide resins are excellent in tensile elongation, but are insufficient in tensile strength and friction against metals. Therefore, there are problems of breakage of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08L51/06C08L23/06C08K13/06C08K9/04C08K3/34C08K7/00C08K5/20
CPCC08L77/06C08L2205/03C08L2205/24C08L2207/066C08L51/06C08L23/06C08K13/06C08K9/04C08K3/346C08K7/00C08K5/20C08K3/34F16H55/06F16H55/22C08K5/0083C08G69/26C08J5/08C08K7/26C08L23/08C08L51/003C08L77/08C08K2201/011C08L2201/08
Inventor 尹智镛朴凤周卢光海
Owner HYUNDAI MOTOR CO LTD
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