Carbon fiber reinforced polypropylene resin composition with excellent molding property

Patent metadata

Field	Value
Publication number	US-9499689-B2
Application number	US-201414479872-A
Country	US
Kind code	B2
Filing date	Sep 8, 2014
Priority date	Dec 17, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

The present invention provides a carbon fiber reinforced polypropylene resin composition with improved molding property. In particular, provided is a carbon fiber reinforced polypropylene resin composition with significantly improved molding property, tensile strength, flexural strength and the like by adding a modified polypropylene grafted with maleic anhydride as a compatibilizer to a polypropylene resin to reinforce the carbon fiber.

First claim

What is claimed is:

1. A polypropylene resin composition, comprising:
an amount of about 50 to about 80 wt % of a polypropylene resin as a homopolymer of propylene or a propylene-ethylene copolymer;
an amount of about 1 to about 10 wt % of a modified polypropylene as a compatibilizer; and
an amount of about 15 to about 40 wt % of carbon fiber,
based on the total weight of the polypropylene resin composition,
wherein the polypropylene resin has a melt index (MI) of about 20 to about 100 g/10 min at a temperature of about 230° C., a molecular weight distribution (MWD) of about 5 to about 10 and an isotactic index of about 97 to about 100, and
wherein the modified polypropylene has a maleic anhydride graft ratio of about 5 to 11 wt %.

2. The polypropylene resin composition of claim 1 , wherein the polypropylene resin composition includes an amount of about 60 to about 70 wt % of the polypropylene resin, an amount of about 2 to about 7 wt % of the modified polypropylene, and an amount of about 25 to about 35 wt % of the carbon fiber, based on the total weight of the polypropylene resin composition.

3. A carbon fiber reinforced polypropylene resin composite prepared by impregnating an amount of about 15 to about 40 wt % of carbon fiber in a melt mixture including an amount about 50 to about 80 wt % of a polypropylene resin as a homopolymer of propylene or a propylene-ethylene copolymer and an amount of about 1 to about 10 wt % of modified polypropylene as a compatibilizer,
wherein the polypropylene resin has a melt index (MI) of about 20 to about 100 g/10 min at a temperature of about 230° C., a molecular weight distribution (MWD) of about 5 to about 10 and an isotactic index of about 97 to about 100, and
wherein the modified polypropylene has a maleic anhydride graft ratio of about 5 to 11 wt %.

4. A method for preparing a carbon fiber reinforced polypropylene resin composite, comprising:
adding an amount of about 1 to about 10 wt % of a modified polypropylene as a compatibilizer to an amount of about 50 to about 80 wt % of a polypropylene resin as a homopolymer of propylene or a propylene-ethylene copolymer;
kneading and melting the resulting mixture at a temperature of about 220 to about 260° C. and at a rotation speed of about 250 to about 400 rpm by means of a twin-screw extruder; and
impregnating an amount of about 15 to about 40 wt % of carbon fiber in the melt mixture at an impregnation die temperature of about 250 to about 320° C.,
wherein the polypropylene resin has a melt index (MI) about 20 to about 100 g/10 min at a temperature of about 230° C., a molecular weight distribution (MWD) of about 5 to about 10 and an isotactic index of about 97 to about 100, and
wherein the modified polypropylene has a maleic anhydride graft ratio of 5 to 11 wt %.

5. The method of claim 4 , wherein in said impregnating, about 7 or 8 impregnation pins are used.

6. A molded product obtained by steps comprising molding with the polypropylene resin composition of claim 1 .

7. The molded product of claim 6 , wherein the molded product is a part for a vehicle.

8. The molded product of claim 7 , wherein the molded product is a vehicle bumper.

Assignees

• Hyundai Motor Co Ltd
• Lotte Chemical Corp

Inventors

• Choi Chi Hoon
• Choi Young Ho
• Kim Gi Hwan
• Cho Jeong Min
• Jang Eun Hwa
• Cho Seong Min
• Choi Chang Hyoo

Classifications

• C08J2423/26

  modified by chemical after-treatment · CPC title

• C08J2323/16

  Ethene-propene or ethene-propene-diene copolymers · CPC title

• C08J2323/12

  Polypropene · CPC title

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• C08L51/06

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title