JPS61228026A - Carbon fiber-reinforced colored resin composition - Google Patents

Abstract

PURPOSE:To provide the titled composition enabling the lightening or coloring of a carbon fiber-containing resin with little lowering of the strength, by adding carbon fiber and white whisker to a resin. CONSTITUTION:The objective composition can be produced by compounding (A) 100pts.(wt.) of a resin (e.g. a thermoplastic resin such as nylon 66, polyethylene terephthalate, PE, etc., or a thermosetting resin such as unsaturated polyester) with (B) preferably 10-40pts. of carbon fiber, (C) preferably 0.2-0.3pt. of white whisker [preferably potassium titanate (K2O.6TiO2) or hydrated potassium titanate (K2O.6TiO2.1/2H2O), and if necessary (D) 0.3-0.7pts. of a dye and/or pigment as colorant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a technique for coloring a black resin "LC" containing carbon fibers.

'Current technology and its problems By adding carbon fiber to resins, its mechanical, thermal, and tK
Improving temperament is widely practiced. However, the addition of carbon fibers inevitably turns the soap black.

Black carbon fiber containing resin gold lightened or other color V good &-
1 - One of the main purposes of human and human life is to use white titanium dioxide as bait alone or in combination with dyes and/or other pigments. It is. However, the disadvantage of using a powder pigment such as titanium dioxide is that it actually reduces the strength improved by the addition of carbon fibers.

As other examples of methods for coloring black carbon fiber-containing resins, methods are also known in which the surface of a molded product is subjected to painting, plating, printing, vapor deposition, or the like. However, the colored layer formed by these methods may peel off due to temperature change, impact, or one friction isostatic pressure.

The present inventor has conducted various studies in view of the above-mentioned problems regarding the coloring of carbon fiber-containing resins, and has found that white whiskers can be used without substantially reducing @M resin strength t.
It has been found that when the resin is lightened or used in combination with a dye and/or a pigment, an excellent effect is exhibited in coloring the resin. The present invention was completed based on this knowledge, and
This invention relates to a carbon fiber-reinforced colored resin composition in which carbon fibers and white whiskers or a coloring agent are added to the resin.

The resin used in the present invention is not particularly limited, and may be either a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin include polyamides such as polyamide 6-6° and polyamide 12; Examples include polyesters such as butylene terephthalate and polyethylene terephthalate, and polyolefins such as polyethylene and polypropylene. Examples of thermosetting resins include unsaturated polyester resins,
Examples include phenol resin and epoxy resin.

In the present invention, the total amount of carbon fibers is usually about 5 to 60 parts by weight, preferably about 10 to 40 parts by weight, per 100 parts by weight of the resin. If the amount of carbon fiber mO used is too large, it becomes difficult to lighten or color the resin. Note that the smaller the amount of carbon fiber used, the easier it is to lighten or color the resin.As the white whisker used in the present invention, potassium titanate (K O s T 102
) % Potassium titanate hydrate (KO・6Ti0
2.1/2E [20χ Aluminum oxide, silicon carbide, etc. are mentioned. Among the many whiskers, these whiskers have a large hiding power, have a large strength improvement effect, have a large coloring effect with dyes and/or pigments, and are easily available.
Potassium titanate and potassium titanate hydrate are most preferred. The whisker usage i may vary depending on the amount of carbon fibers, the type of resin, etc., but is usually 0.1 to 0.51 per part by weight of carbon fibers. About 31 parts, preferably 0.2 parts
~0.3 parts by weight.

In the present invention, the resin can be colored by adding dyes and/or pigments as coloring agents, if necessary. The amount of these dyes and/or pigments used is not particularly limited, but the total amount of resin and carbon fiber is 100 J.
It is usually about 0.1 to 1 part by weight, more preferably about 0.3 to 0.7 part by weight, based on the amount of jE. Excessive amounts of dyes and/or pigments deteriorate the properties of the resin;
If it is too small, the coloring effect will not be sufficient.

The composition of the present invention is suitable for injection molding using thermoplastic resin,
Although it is most suitable as a composition for extruded bottom shapes, it can also be used as a bulk molding compound or sheet molding compound based on a thermosetting resin.

Effect of the invention According to the present invention, the following effects are achieved.

(1) Since the carbon fiber-containing resin can be lightened and colored more clearly than before, the component value of products made of the resin is increased.

(11) The stiffness t of carbon fiber-containing resin products is hardly reduced.

・11) Examples in which the coloring state changes due to temperature changes, friction, etc. Examples and comparative examples are shown below to further clarify the characteristics of the present invention.

Example 1 Polyamide 12.100] [Carbon fiber (diameter of about 10 μm in resin composition, length of about 0.3 m1) 1
Potassium titanate whiskers (diameter 0, 2 to 0.5
In addition, a test piece (JIS K 71131 dumbbell test piece) was prepared by injection molding, and the tensile strength was measured at 23±2°C at a speed of 10 mmZmin.

Table 1 shows the blending ratio of resin composition A and potassium titanate whiskers, color tone and tensile strength of test pieces. Table 1 also shows similar results for other examples and comparative examples. Also shown.

Example 2 4bMnVe'knekai1&A11l<h174J+4
11! JmJ.

(same as that used in Example 1) and yellow lead as a coloring agent.

9. Create a test piece.

Comparative Example 1 A test piece was prepared in the same manner as in Example 1 using a resin composition for personal use only.

Comparative Example 2 Resin composition containing yellow lead (same as used in Example 1)
A test piece was prepared using the same method as in Example 1 except that the food material was added to the hole.

Comparative Example 3 A test piece was prepared in the same manner as in Example 1, except that a material containing titanium oxide powder mixed with a resin composition was used.

Comparative example 4 # titanium powder (used in comparative example 3) was added to the mng composition.
A test piece was prepared in the same manner as in Example 1, except that the material tAt (same as that used in Example 1) and yellow lead (same as that used in Example 1) were used.

Example 3 A resin composition f (hereinafter referred to as resin composition B) containing 43 parts by weight of carbon fiber (same as that used in Example 1) to 6-6.100 parts by weight of polyamide, potassium titanate whiskers and yellow A test piece was prepared in the same manner as in Example 1 by adding lead (both of which were the same as those used in Example 1).

Comparative Example 5 A test piece was prepared in the same manner as in Example 1 using only am composition B.

Comparative Example 6 Seven test pieces were prepared in the same manner as in Example 1 except that a material containing resin composition BK titanium oxide powder (same as that used in Comparative Example 3) was used.

As is clear from the results shown in Table 1, the resin composition of the present invention has a strength of 1! i! without degrading quality.

It has a distinct effect of being clearly colored.

(that's all)

Claims (2)

[Claims] (1) A carbon fiber-reinforced colored resin composition in which a resin is blended with carbon fibers and white whiskers. (2) The carbon fiber reinforced colored resin composition according to claim 1, which further contains a colorant.