JPS5953537A - Manufacture of conductive resin composition - Google Patents

Abstract

PURPOSE:To obtain titled composition ensuring conductivity comparable to that with powdered conductive filler, by first incorporating a fibrous conductive filler in a resin followed by high-speed agitation in a mixer equipped with a stirring blade, leading to little degradation of the fibrous state. CONSTITUTION:A mixer equipped with a stirring blade is charged with (A) 100pts.wt. of a resin (mainly a thermoplastic one) and (B) pref. 150pts.wt. of a fibrous conductive filler (e.g., steel fiber with a diameter of 50mum and length of 2mm.) to carry out a high-speed agitation (e.g., at 2,000rpm) to allow the resin to melt due to the heat generated followed by further agitation to effect uniform dispersion of the filler, thus obtaining the objective composition.

Description

[Detailed description of the invention] The present invention relates to a method for producing a conductive resin composition.

Conventionally, when imparting conductivity to a resin, a powdery substance such as carbon black, metal powder, or metal flakes is used as the conductive substance, and this is mixed with the resin using a hot roll or a single- or multi-screw kneading extruder. The training is working.

However, recently, metal fibers or metal plating have been applied.
It is becoming increasingly common to knead fibrous conductive materials such as leather fibers and metal-plated glass fibers into resins. This is because the fibrous conductive material is in contact with each other in the tree to ensure overall conductivity.
Contact between fibers (contact between powders, etc., can easily occur, so adding I+ to the powdered conductive material, which is relatively small) will result in a conductive force (certainly 4'41.13).11( This is because this resin composition has physical and economical advantages.

Only 1. Therefore, in order to fill one resin with a fibrous conductive material, the above-mentioned hot rolls and kneading extruder, which have been frequently used in the past, cannot be used.7. That is, roll kneading has the drawback that the shearing force during mixing causes the fibrous material to be cut, broken, and powdered. The shearing force between the - and the barrel wall surface is 0, which is caused by the shearing force generated in the meshing gap between the screw and the screw, and the fibrous material is similarly powdered and conductive.
f) (There was a drawback that it did not manifest as expected.

The present invention improves these drawbacks and improves fiber quality! The object of the present invention is to provide a manufacturing method that hardly damages the fiber state of the IF4 conductive material and can uniformly disperse it in the 4(.1 fat).

That is, the present invention is characterized in that a container equipped with a resin and a fibrous conductive material stirring blade is placed in a container, and the resin is melted by the heat generated by stirring at high speed, thereby dispersing and mixing the fibrous conductive material into the resin. shall be. The container equipped with stirring blades is, for example, a 4T'1 type container with a bottom surface and a side wall connected by a smooth curved surface. Incidentally, the 1 lil J force was set so that the electric motor had sufficient margin so that the stirring blade could withstand the resistance of the contents and rotate at high speed. Alternatively, several electric wire heaters may be installed on the outside of the container body, or a jacket may be attached to enable steam heating, thereby increasing the temperature of the contents.

Using a stirring mixer as described in 1., put resin and fibrous conductive material into it and rotate the stirring blades at high speed, the resin will be vigorously stirred by the stirring blades.i1 Collision between resins, friction, resin and stirring blades, The temperature caused by the collision and friction between the resin and the vessel wall reaches -Li and finally reaches the melting point of the resin, and some of the molten resin and the fibrous conductive material begin to mix. During this time, the external heating device may be operated to compensate for the temperature increase. If you continue stirring,
The melting of the resin further progresses, and the fibrous conductive material further mixes with the resin. In this way, the amount of resin that can be melted is mixed with the fibrous conductive material, so that the mixing is uniform and the dispersion state is also improved.

Furthermore, since the shearing force applied to the fibrous conductive material is low, mixing with the resin is performed while maintaining the fiber shape. When the dispersion of the fibrous conductive material into the resin is completed in this manner, the material is taken out of the container and crushed into appropriate sizes while being cooled.

The resin referred to here mainly refers to thermoplastic resins (poly J,
Dilene, polypropylene, nylon, ABS, poly→
norphone, polyphenylene; t-+-side, polyphenylene sulfide, d! Rib 1-bonato etc.
, ), but thermosetting resins (phenol resin, epoxy resin, polyester resin, etc.) may also be used.

Next, the present invention will be described in detail 1. Example 1 Contents fi'
Fat pellets f3 KP, steel fiber (2 lengths,
9 was charged into 12' (diameter 50 μm) and mixed at 2ooorpm using a tablet-shaped stirring blade. After 15 minutes, the steel fibers were crushed to obtain a coarse-grained molded material 1'1.

When the m grains were soaked in the solvent methyl ether and the steel fiber molecules Hf, L, and length were observed, they were unchanged from before preparation. .

Example 2 120 μm) 7 K9 was charged and mixed with high speed stirring in the same manner as above to obtain a molding material in the form of oro particles. When I observed the separated aluminum fibers by dissolving these 11 grains in hot toluene, I found that the shape of the fibers was the same as before preparation! =.

Comparative Example Steel fibers were extracted in the same manner from a resin composition obtained by kneading and mixing using a hot roll with the same formulation as in Example 1.
The average length had decreased to about 0.5 mm.

According to the present invention, the fibrous conductive material is dispersed and mixed into the resin without being damaged, so the conductive material acts effectively and can achieve the same result with a small amount of addition compared to powdered conductive material. The conductivity of the culm can be ensured.

Therefore, the physical properties of the resin are less likely to be degraded by adding substances to the conductor 71, and less expensive conductive substances are used.
The economic effect is also large because it is effective.

Industrial (111 white 11'1 is extremely large).

Special W1 applicant Shin-Kobe Electric Co., Ltd. Representative Director Takesanbe Ishigaki

Claims (1)

[Claims] A conductive resin composition characterized in that a resin and a fibrous conductive substance are placed in a container equipped with stirring blades, and the resin is melted by the heat generated by stirring at high speed, thereby dispersing and mixing the fibrous conductive substance in the resin. How things are manufactured.