JP2001329086A - Plastic molded article antistatic treated - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic molded article antistatic treated which has good transparency, good processability and good durability. SOLUTION: On the surface (either one side or both sides) of an object 1 to be treated of a plastic molded article, numerous minute areas of films 2 composed of an antistatic agent or an electrically conductive coating material are discontinuously formed, and each of these minute areas of films 2 is made to have an area of <=3 mm3, a thickness of <=3 μ, and an interval of each of the minute areas of films 2 of not longer than the longest side of the minute areas of films 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an antistatic agent such as a surfactant or a microscopic thin film such as a conductive paint discontinuously on the surface (one or both surfaces) of a plastics molded article. It relates to the processed molded article.

[0002]

2. Description of the Related Art Conventionally, as an antistatic treatment of a plastics molded article, an aqueous solution containing an antistatic agent or the like is formed into an aerosol by a fine particle spray nozzle (aerosol spraying device) or the like, and the aerosol is applied to a plastics molded article to be processed. Spray on the surface, apply an aqueous solution containing the above antistatic agent with a brush, or immerse the object in these liquids to form a thin film made of the antistatic agent on the surface of the plastic molded article. ing. In this case, in order to obtain an antistatic effect, it is necessary that the thin film be uniform and continuous, or that the film be continuous such as a mesh or a large number of lines.

[0003]

However, with these conventional methods, it is difficult to form a uniform thin film. Also,
It is difficult to form a continuous film. In particular, in the case of optical products such as a lens and a display of a large television, transparency is required. However, if the film is not uniform, the transparency is low, and a stripe pattern due to unevenness appears. Further, since a thin film exists on the surface of these plastics molded products, it is difficult to process such as printing on these surfaces or applying an adhesive, and the workability is poor at present.

Accordingly, the present invention has been made in view of the above points, and provides an antistatic treated plastic molded article having good transparency, good workability, and good durability.

[0005]

According to the first aspect of the present invention, a large number of microscopic thin films made of an antistatic agent or a conductive paint are formed discontinuously on the surface (one or both surfaces) of a plastics molded product. Each of these micro-surface thin films was an antistatic plastic molded article having an area of 3 mm ² or less, a thickness of 3 μ or less, and an interval of each micro-surface thin film of no more than the maximum side length of the micro-surface thin film. In this case, when particularly required transparency, the area of each fine surface film may be set to be 40 [mu ² or less. When durability is required, the thickness of each of the micro-surface thin films is preferably 0.35 μm or less. Further, when obtaining an attenuation (static elimination) of an electrostatic voltage without generation of an electromagnetic wave due to electrostatic discharge, the interval between each of the minute surface thin films is 10 μm or less, and the surface resistance value is 10 ⁶ Ω or less.
A good value is 10 ¹¹ Ω.

As described above, even when a large number of micro-surface thin films are discontinuous, the shape size and the distance between the individual micro-surface thin films are close to each other. Even when charging occurs, the lines of electric force (electrostatic force) converge toward the adjacent micro-surface thin film, and at the same time, the lines of electric force attenuate. Also, if there are many irregularities on the surface of the plastics molded product, the lines of electric force are concentrated on the tips of the protruding parts and the sharp corners. Alternatively, if the purpose is to increase the friction resistance, a minute surface thin film may be formed only in the valleys of the concave portions.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a large number of micro-surface thin films 2 made of an antistatic agent or a conductive paint are formed discontinuously at substantially equal intervals on the surface of an object to be processed 1 which is a plastics molded product. Each micro-surface thin film 2 has an area of 3 mm ²
Hereinafter, the thickness is set to 3 μm or less, and the interval between the minute surface thin films 2 is set to be equal to or less than the maximum side length of the minute surface thin film 2.

In order to form such a microscopic thin film 2,
First, the surface of the workpiece is neutralized. For this purpose, the charge may be removed by using an ionizer or a charge removing brush, or may be removed by spraying with pure water or alcohol. In this way, an electric force that inhibits the electrostatic force between the particles of the aerosol is excluded. Then, a liquid obtained by dissolving the antistatic agent or the conductive paint in a solvent containing water is formed into an aerosol by a fine particle spray nozzle. This aerosol is made up of particles having a particle size of 20 to 40 μm. An aerosol composed of these particles is applied to the object. Then, a large number of particles of the aerosol adhere to the surface of the object 1 to be processed, and are dried to form the microscopic thin film 2. These minute surface thin films 2 are independent of each other and adhere discontinuously. In order to form a large number of micro-surface thin films 2 discontinuously at substantially regular intervals on the surface of the object to be treated, as described above, the surface of the object to be treated is preliminarily free of electric charges. This can be achieved by adjusting the size of the particles of the aerosol to be sprayed as described above and controlling the spraying time of the aerosol on the article 1 to be processed. However, even if the surface of the object is not necessarily neutralized in advance, a discontinuous micro-surface thin film can be obtained. Further, depending on the location, a plurality of fine particles of the aerosol may be aggregated or aggregated before and after adhering to the surface to be processed to form a microscopic thin film larger than others.

Further, as shown in FIG. 3, even if a large number of micro-surface thin films 2 are discontinuous, the distance between adjacent micro-surface thin films 2 is short, so that Even if charging occurs in between, the lines of electric force T (electrostatic force) converge toward the adjacent thin film 2, and the lines of electric force attenuate.

The micro-surface thin film 2 is mainly composed of a surfactant, and an antistatic agent mixed with 0.2% or less of a fluorine-based surfactant in order to keep the surface tension below the surface tension of the object to be treated. And an ion conductive agent such as a charge transfer complex, and an electron conductive material in which an emulsion composed of a resin component and fine particles of various shapes such as metals, metal oxides, and carbon are mixed. In the case of the antistatic agent, the concentration is 3 to 8%, and a conductive filler may be added. In the above-described embodiment, the discontinuous micro-surface thin film is formed by the aerosol spray method, but may be formed by a transfer method using a mold such as a gravure coat or a micro coat, or a transfer method using a roll. You can also.

Examples of the surfactant include sodium 16-fluorohexadecylcarboxylate, perfluorooctylcarboxylic acid-N, N-diethanolamine, sodium perfluorooctyl phosphate, sodium perfluorodecyl phosphate, and polyoxyethylene perfluorophosphate. Sodium octyl phosphate, N-polyoxyethylene-N-ethyl perfluorooctyl sulfonamide, N, N-di (polyoxyethylene) perfluorooctyl sulfonamide, N-polyoxyethylene-N-butyl perfluorodecyl sulfonamide , N
-Polyoxyethylene-N-ethyl perfluorooctadecylsulfonamide, perfluorododecyltrimethylammonium salt, perfluorooctadecyl betaine, polyoxyethylene perfluorooctyl ether, polyoxyethylene perfluorooctadecenyl ether, polyoxyethylene perfluorohexyl Amines and perfluorododecyl carboxylic acid sorbitan esters;

In the above embodiment, if transparency is particularly required, the area of each of the micro-surface thin films is set to 4
0μ may be set to be ² or less. When durability is required, the thickness of each of the micro-surface thin films is preferably 0.35 μm or less. Further, when the attenuation (static elimination) of the electrostatic voltage without the generation of the electromagnetic wave due to the electrostatic discharge is required, the interval between the respective minute surface thin films is 10 μm or less, and the surface resistance value is 10 ⁶ Ω to 10 ⁶ Ω. ^A good value is ¹¹ Ω. This can be said from Paschen's law. Further, in the above embodiment, a large number of minute surface thin films are arranged at substantially equal intervals, but they need not necessarily be formed at equal intervals. Also, the shape of each micro-surface thin film may be circular, square, or any other appropriate shape.

[0013]

According to the first aspect of the present invention, a microscopic thin film is discontinuously formed on the surface of a plastics molded product, but the antistatic effect is smaller than that of a continuous thin film made of an antistatic agent. Is no inferior. In addition, since the unprocessed portion is continuous, the workability such as printing adhesion is good. In addition, it has good transparency and is suitable for optical products requiring transparency. There is also durability. In addition, in the conventional method, fine dust attached to the object to be processed is included in the coating,
This lifts up and creates a white pattern. However, according to the present invention, the fine dust moves to the outer periphery of the fine surface thin film and collects between the fine surface thin films, that is, on the unprocessed surface.

Further, when the area of each of the microscopic thin films is set to 40 μ ² or less as in the invention of the second to sixth aspects,
Especially good transparency. In addition, the thickness of each of the above minute surface thin films,
When the thickness is 0.35 μm or less, the durability is good. Further, when the distance between the micro-surface thin films is 10 μm or less and the surface resistance value is 10 ⁶ Ω to 10 ¹¹ Ω, attenuation of static voltage (electrostatic discharge) without generation of electromagnetic waves due to electrostatic discharge. Can be caused.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an operation state of electric lines of force in the embodiment of the present invention.

[Explanation of symbols]

 1 object to be processed 2 micro surface thin film

Claims (4)

[Claims] 1. A large number of minute surface thin films made of an antistatic agent or a conductive paint are discontinuously formed on the surface (one surface or both surfaces) of a plastics molded product.
An antistatic-treated plastics molded product having an area of 3 mm ² or less, a thickness of 3 μ or less, and a distance between each of the micro-surface thin films is equal to or less than a maximum side length of the micro-surface thin film. 2. The plastics molded article subjected to antistatic treatment according to claim 1, wherein the area of each of the micro-surface thin films is 40 μ ² or less. 3. The method according to claim 1, wherein the thickness of each of the minute surface thin films is 0.35 μm.
The plastics molded article subjected to the antistatic treatment according to claim 1 or 2, characterized in that: 4. The method according to claim 1, wherein the distance between the micro-surface thin films is 10 μm or less, and the surface resistance is 10 ⁶ Ω to 10 ¹¹ Ω. A plastics molded article subjected to the antistatic treatment according to any one of the above.