Woven article for carbon fiber reinforced plastic and molded product formed therefrom

Patent metadata

Field	Value
Publication number	US-11674243-B2
Application number	US-201716345787-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 31, 2016
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

A woven article for a carbon fiber reinforced plastic according to the present invention is a woven article of a spun yarn containing: about 10 wt % to about 60 wt % of a carbon fiber staple in which the content of carbon components is equal to or greater than about 97 wt %; and about 40 wt % to about 90 wt % of a thermoplastic resin fiber, wherein the carbon fiber staple is obtained by carbonizing carbon fiber reinforced plastic scrap at a temperature of about 900 to about 1400° C. The woven article for a carbon fiber reinforced plastic includes a carbon fiber staple manufactured from scrap generated during manufacture of the carbon fiber reinforced plastic, and allows economic recycling of the carbon fiber reinforced plastic scrap without a reduction in mechanical properties. When molded, productivity is high due to a short cycle time, there is almost no orientation, and an excellent flexural modulus is exhibited.

First claim

The invention claimed is:

1. A woven article for carbon fiber-reinforced plastics, the woven article being manufactured using spun yarn comprising 10 wt % to 60 wt % of staple carbon fibers having a carbon content of 97 wt % or more and 40 wt % to 90 wt % of thermoplastic resin fibers,
wherein the staple carbon fibers are obtained by carbonizing a carbon fiber-reinforced plastic scrap at 900° C. to 1,400° C.,
wherein the spun yarn has an average diameter of 0.5 mm to 3.0 mm, and
wherein the staple carbon fibers have a tensile modulus of 100 GPa to 1,000 GPa, as measured in accordance with ASTM D3379, an average diameter of 5 μm to 10 μm and an average length of 65 mm to 100 mm.

2. The woven article according to claim 1 , wherein the thermoplastic resin fibers comprise a polyamide resin, a polyester resin, and/or an acrylic resin.

3. The woven article according to claim 1 , wherein the thermoplastic resin fibers have an average diameter of 5 μm to 30 μm and an average length of 10 mm to 110 mm.

4. The woven article according to claim 1 , wherein the woven article is impregnated with a thermoplastic resin.

5. The woven article according to claim 1 , wherein the woven article has a notched Izod impact strength of 3.5 kgf·cm/cm or more, as measured on a 1/8″ thick specimen prepared by compression molding of the woven article in accordance with ASTM D256.

6. The woven article according to claim 1 , wherein the woven article has a flexural modulus of 5 GPa to 35 GPa, as measured on 1/4″ thick specimens prepared by compression molding of the woven article in a longitudinal direction (X- axis direction) and in a perpendicular direction (Y-axis direction) with respect to the longitudinal direction, respectively, in accordance with ASTM D790, and a difference between flexural moduli of the specimen compressed in the X-axis direction and the specimen compressed in the Y-axis direction ranges from −5% to 5%.

7. A method of manufacturing a woven article for carbon fiber-reinforced plastics, comprising:
preparing spun yarn by blend-spinning 10 wt % to 60 wt % of staple carbon fibers having a carbon content of 97 wt % or more and 40 wt % to 90 wt % of thermoplastic resin fibers; and
weaving the spun yarn,
wherein the staple carbon fibers are obtained by carbonizing a carbon fiber-reinforced plastic scrap at 900° C. to 1,400° C.,
wherein the spun yarn has an average diameter of 0.5 mm to 3.0 mm,
wherein the staple carbon fibers have a tensile modulus of 100 GPa to 1,000 GPa, as measured in accordance with ASTM D3379, an average diameter of 5 μm to 10 μm and an average length of 65 mm to 100 mm.

8. The method according to claim 7 , wherein preparing the spun yarn by blend-spinning the staple carbon fibers and the thermoplastic resin fibers comprises carding, combing, and spinning steps.

9. A molded article formed of the woven article for carbon fiber-reinforced plastics according to claim 1 .

10. The molded article according to claim 9 , wherein the molded article is manufactured by compression molding of the woven article.

Assignees

• Lotte Chemical Corp
• Lotte Advanced Mat Co Ltd

Inventors

• Ban Kyun Ha
• Bae Yun Seok
• Hong Chang Min

Classifications

• B29B2017/0496

  Pyrolysing the materials · CPC title

• D03D15/41

  with specific twist · CPC title

• B29B17/04

  Disintegrating plastics, {e.g. by milling}(B29B9/02, B29B11/02, B29B13/10, {B29B17/02} take precedence) · CPC title

• D03D1/00

  Woven fabrics designed to make specified articles · CPC title

• B29K2105/12

  of short lengths, e.g. chopped filaments, staple fibres or bristles · CPC title