Manufacturing method for polyacetal resin composition

Abstract

The invention provides a manufacturing method for a polyacetal resin composition, and the manufacturing method can manufacture a polyacetal resin composition with high conductivity and high strength by directly melting and mixing a conductive carbon material with an average diameter of 5-500 nm and a ratio of average length / average diameter of above 5 and a polyacetal resin through a twin-screw extruder without the preparation of a master batch containing the conductive carbon material. During the manufacture of the polyacetal resin composition by melting and mixing the conductive carbon material with an average diameter of 5-500 nm and a ratio of average length / average diameter of above 5 and the polyacetal resin through the twin-screw extruder, the following twin-screw extruder is used that: a plasticizing part is disposed at the upstream side of the twin-screw extruder; a mixing part is disposed at the downstream side of the plasticizing part; at least a portion of the mixing part is formed by a screw element of a structure pushing a part of the molten resin to a direction opposite to the extruding direction (upstream direction).

Description

technical field [0001] The present invention relates to a method for producing a polyacetal resin composition obtained by melting and kneading a polyacetal resin and a conductive carbon material. Background technique [0002] Polyacetal resin is widely used as a material for components used in OA equipment and various precision equipment due to its balanced mechanical properties and excellent sliding properties. However, since polyacetal resin is an electrical insulator, it has a problem in that it is poor in removing static electricity generated during sliding, and it is difficult to use it in applications where generation of static electricity is a problem. [0003] In order to solve the above problems, many methods have been proposed for imparting conductivity to the polyacetal resin by blending a conductive fine carbon material such as carbon nanotubes into the polyacetal resin. [0004] The compounding of various additives and fillers in polyacetal resin materials is u...

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Problems solved by technology

However, since polyacetal resin is an electrical insulator, it has a problem that it is poor in removing static electricity generated during sliding, and it is difficult to use it in applications where generation of static electricity is a problem.

However, when conductive fillers such as carbon nanotubes are blended into polyacetal resin according to the usual method using a twin-screw extruder, the conductive fillers are not sufficiently dispersed in the resin, so there are the following problems: Not only is it difficult to obtain a polyacetal resin composition with low resistivity, but also the polyacetal resin composition cannot express sufficient mechanical properties

[0006] However, the method described in Patent Document 1 needs to produce a masterbatch first, so there are problems in that the production process of the polyacetal resin composition becomes complicated and the production cost of the polyacetal resin composition increases.

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