Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Carbon fiber and method for producing same

A manufacturing method and carbon fiber technology, applied in the direction of chemical characteristics of fibers, textiles and papermaking, single-component synthetic polymer rayon, etc., can solve the problems of short fiber length, low molding processability, low productivity, etc., and improve productivity. and mechanical properties, excellent tensile elastic modulus, the effect of reducing the required amount

Active Publication Date: 2021-02-12
TORAY IND INC
View PDF15 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphitization process can effectively improve the tensile elastic modulus of carbon fibers, but on the other hand, it is easy to need equipment for high temperature, and it is easy to promote the crystal growth in carbon fibers so that the tensile strength and compressive strength of the obtained carbon fibers are relatively low. Low
In addition, such high elastic modulus carbon fibers tend to be low in productivity as carbon fibers as described above and low in molding processability when obtaining carbon fiber reinforced composite materials, and when used as discontinuous fibers, the fiber length tends to be shortened

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbon fiber and method for producing same
  • Carbon fiber and method for producing same
  • Carbon fiber and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] After the flame-resistant fiber bundle is obtained by the method described in the general examples, the obtained flame-resistant fiber bundle is twisted to give 75 twists / m twist, and in a nitrogen atmosphere at a temperature of 300 to 800°C, Pre-carbonization treatment was performed at a draw ratio of 0.97 to obtain a pre-carbonized fiber bundle. Then, under the conditions shown in Table 1, the pre-carbonized fiber bundles are subjected to carbonization treatment, and then, using sulfuric acid aqueous solution as electrolyte, carry out electrolytic surface treatment with an electric quantity of 30 coulombs per 1 g of carbon fiber, to obtain surface oxygen concentration ( O / C) is a carbon fiber bundle of 0.09. The passability of the carbonization step was good, and the quality of the obtained carbon fiber bundle was also good. The moldability was rated AA, which was at a very high level. Table 1 shows the evaluation results of the obtained carbon fibers.

Embodiment 2

[0182] A carbon fiber bundle was obtained in the same manner as in Example except that the twist was 50 twists / m and the tension during the carbonization treatment was 5.2 mN / dtex. The passability of the carbonization step was good, and the quality of the obtained carbon fiber bundle was also good. The moldability was rated AA, which was at a very high level. Table 1 shows the evaluation results of the obtained carbon fibers.

Embodiment 3

[0184] A carbon fiber bundle was obtained in the same manner as in Example 2, except that the tension during the carbonization treatment was 10.2 mN / dtex. The passability of the carbonization step was good, and the quality of the obtained carbon fiber bundle was also good. The moldability was rated AA, which was at a very high level. Table 1 shows the evaluation results of the obtained carbon fibers.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The present invention addresses the problem of providing a carbon fiber for a carbon fiber reinforced composite material which is not easily damaged during a molding process and exhibits an excellentelastic modulus. The carbon fiber has a strand elastic modulus of at least 360 GPa, a strand strength of at least 3.5 GPa, and a single fiber diameter of at least 6.0 [mu]m, and satisfies one or moreof the requirements below. (A) When one end is a fixed end and the other end is a free end that can rotate about the axis of a fiber bundle, the remaining twist number is at least 2 turns / m. (B) The total fineness, which is the product of the single fiber fineness (g / km) as a carbon fiber and the number of filaments (counts), is at least 740 g / km. In addition, the single fiber elastic modulus Es (Gpa) and the loop breaking load A (N) of the carbon fiber satisfy the relationship of expression (1). (1): A>=-0.0017*Es+1.02. Furthermore, the single fiber diameter of the carbon fiber is at least 6.0 [mu]m, the relationship between the strand elastic modulus E (GPa) of the carbon fiber and the knot strength B (MPa) of the carbon fiber as evaluated at a heating loss rate of 0.15% or less at 450 DEG C satisfies expression (2), and the twist number of the carbon fiber is 20-80 turns / m. (2): B>= 6.7*109*E-2.85.

Description

technical field [0001] The present invention relates to carbon fibers and methods for their manufacture. Background technique [0002] Carbon fiber is an indispensable material for achieving high energy efficiency in society because it has excellent specific strength and specific elastic modulus, and by using it as a reinforcing fiber for carbon fiber-reinforced composite materials, it can greatly reduce the weight of parts One of them is widely used in various fields. In recent years, it has been used in fields where there is a strong demand for cost reduction, such as automobiles and electronic equipment housings, and there is a strong demand for cost reduction of final parts including molding costs. [0003] In order to effectively reduce the cost of the final part, not only the cost reduction of carbon fiber itself is important, but also a comprehensive approach such as reducing the required amount by improving the performance of carbon fiber, and reducing molding cost ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F6/18
CPCD01F6/18D01F9/225D01F6/38D01F9/22
Inventor 奥田治己渡边润松本直浩田中文彦
Owner TORAY IND INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products