JPS5980447A - Carbon-fiber reinforced thermoplastic resin composition - Google Patents

Abstract

PURPOSE:The titled composition, consisting of carbon fibers coated with AS resin and a thermoplastic resin, and having improved adhesive property of the carbon fibers to the thermoplastic resin and further mechanical characteristics, e.g. elongation or bending, etc. CONSTITUTION:A carbon-fiber reinforced thermoplastic resin composition consisting of carbon fibers coated with AS resin, preferably copolymer of acrylonitrile and styrene at (5:95)-(30:70) copolymer composition having 0.3-0.7ml relative viscosity, and a thermoplastic resin, e.g. one or more of ABS resin and AS resin. The amount of coating the carbon fibers is preferably 3-7wt% based on the total weight.

Description

[Detailed Description of the Invention] The present invention provides a carbon fiber-containing composite material that is surface-treated to improve adhesion between carbon fibers and IJ Fuchs resins and to provide excellent mechanical properties. The present invention relates to a carbon fiber-reinforced thermoplastic resin composition containing carbon fibers.

Until now, various surface treatments of carbon fibers have been studied.

However, most of them are for thermosetting resins, and in practical use, most of them are surface-treated epoxy resins. Surface treatment agents for carbon fibers when making IJ socks from thermoplastic resins have hardly been studied, and polyamides, polysulfones, polyvinyl alcohols, etc. have been considered as sizing agents for carbon fibers. Therefore, even if these polymer carbon fibers are coated, a sufficient interfacial effect cannot be obtained. Moreover, like other filler-containing composite materials, carbon fiber reinforced thermoplastic resin (hereinafter abbreviated as CFRTP)
Also, the adhesion between carbon fibers and various thermoplastic resins as matrix resins is an extremely important factor in achieving the composite effect. Therefore, the present inventors conducted extensive research to find a surface treatment agent that has the former two purposes of convergence of carbon fibers and adhesion between carbon fibers and thermoplastic resin. The present invention has been completed based on the discovery that by coating the surface of the composite material, the workability during the production of chopped strands and when composited with a thermoplastic resin is excellent, and the mechanical properties as a composite material are significantly improved.

The As resin used in the present invention has a specific viscosity of n5VC (0,
1Xl) MF', measured at 25°C) is 0.2 to 1.0
'/y is suitable, preferably 03 to 0.7 m
It is l/9. If the viscosity is too low, the carbon fibers will have poor cohesiveness and will become fluffy, resulting in poor workability during chopped strand production and when compounding with thermoplastic resin. . S
]/C is too high, surface treatment of each single fiber becomes difficult, and when each single fiber is dispersed in the composite material, adhesion with the matrix resin becomes poor. Furthermore, the amount of coating of the carbon fibers with the As resin is suitably 1 to 10% by weight, preferably 3 to 7% by weight, based on the total weight of the carbon fibers and surface treatment agent. Generally, if the coating amount of the surface treatment agent is too small, the strands will become more fluffy and the workability during production of chopped strands and when composited with thermoplastic resin will be impaired. Furthermore, if the coating amount of the surface treatment agent is too large, the winding properties of the carbon fiber strand after treatment will be poor, and the physical properties of the composite material as a whole will be deteriorated due to the influence of the surface treatment agent. The appropriate composition of the A and S resins is acrylonitrile styrene 5:95 to 30:70. The method of surface treatment is not particularly limited, but as a preferred example, the surface treatment agent is dissolved in a suitable solvent such as methyl ethyl ketone or methylene chloride, the carbon fiber is immersed in the solution at a constant speed, and then a bath agent is added. An example is a method of drying by evaporation. The amount of the surface treatment agent coated on the carbon fibers is adjusted by the concentration of the surface treatment agent and the passing speed of the carbon fibers.

Specific examples of the thermoplastic resin used in the resin composition of the present invention include nylon 6, nylon 6°6, nylon 6,
12. ABS, As, PC, PE, PAC.

Any material such as MMA, PI)S, polystyrene, or high-impact polystyrene can be used, but ABS, As, and polystyrene are particularly effective.

Can you name high impact polystyrene?

Since the carbon fibers used in the present invention are coated with As resin, their affinity with thermoplastic resins is significantly improved compared to surface-treated carbon fibers developed in the past. A thermoplastic resin composition with excellent mechanical properties can be obtained.

This will be explained in detail below using examples.

Example 1 Acrylonitrile styrene-A and S resins having a composition ratio of 15:85 and a specific viscosity nSP/c (measured in 0.1% DMF at 25°C) shown in Table 1 were dissolved in methyl ethyl ketone, and carbon The fibers were immersed and passed through to be coated with A8 resin in the amount shown in Table 1, dried, cut into chopped strands, and extruded into the thermoplastic resin shown in Table 1 at a content of 20 wt%. Obtained pellets.

Table 1 shows the results of injection molding the pellets and measuring their physical properties.
It was shown to. Experiment numbers 1 to 4 show the results of the present invention, and experiment numbers 5 to 10 show comparative examples.

In addition, the living value of the product is 8 STM-] for the tensile test.”1163
The 8° bending test was conducted according to A, STM-D 790, and the Izot impact test was conducted according to ASTIVI-D256.

As shown in Table 1, it can be seen that CFRTD containing carbon fibers surface-treated with As resin has excellent mechanical properties.

Procedural amendment (formality) March 3, 1982 Mr. Kazuo Wakasugi, Commissioner of the Patent Office 1.Display of the incident 1981 Patent Application No. 190068 2. Name of the invention 3 Person making the amendment Relationship to the case Patent applicant 2-3-19 Kyobashi, Chuo-ku, Tokyo (603) Mitsubishi Rayon Co., Ltd. President and Director Osamu Kanazawa 4. Agent 2-8-1 Toranomon, Minato-ku, Tokyo Sent on February 22, 1982 6. Subject of correction Specification 7. Contents of correction Engraving of the statement (no changes to the contents) 391-

Claims (1)

[Claims] A carbon fiber-reinforced thermoplastic resin composition comprising carbon fiber coated with tAs resin and a thermoplastic resin. 2. Specific viscosity n81/C (Q, 1%DM
F. 2. The carbon fiber-reinforced thermoplastic resin composition according to claim 1, wherein the carbon fiber-reinforced thermoplastic resin composition has a carbon fiber content of 03 to 07 ml/y (measured at 25°C). 3. The carbon fiber-reinforced thermoplastic resin composition according to claim 1, wherein the amount of AS resin coated on the carbon fibers is 1 to 10% by weight of the total weight of the carbon fibers and surface treatment agent. . 4. Acrylonitrile: styrene = 5 as AS resin:
2. The carbon fiber-reinforced thermoplastic resin composition according to claim 1, characterized in that the copolymerization composition is within the range of 95 to 30 Nia0. 5 ABS resin and AS resin as thermoplastic resins. The carbon fiber reinforced thermoplastic resin composition according to claim 1, characterized in that at least one resin selected from polystyrene and high impact polystyrene is used.