JPS6012230B2 - Colorable semiconductive plastic structural material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a semiconductive plastic structural material that can be freely colored, and is particularly applicable to flooring materials used around electronic devices, wall materials used in workbenches for electronic devices, medical clean rooms, etc.
It also relates to highly elastic semiconductive plastic structural materials that can be freely colored and passed through other places where it is necessary to avoid static electricity.

In general, plastics generate static electricity due to friction and are charged, so various static electricity problems occur when they are used. For example, when a plastic sheet is used for a workbench for electronic equipment, it attracts dust and the like during handling, damaging electronic components. Further, in the case of electronic devices such as computers, there are drawbacks such as receiving electric shock due to the application of static electricity generated from a charged human body, causing malfunction of the electronic device. As a solution to these problems, '
1) Dispersing carbon black in thermoplastic plastic, dissolving it in a solvent, etc. to make a paint, and applying it to floors, etc., {21. Mixing and dispersing carbon black in thermoplastic plastic or synthetic rubber, and rolling it. To make a sheet and spread it on a floor, etc. {3} To make a sheet by applying antistatic agent to thermoplastic plastic and rolling it into a sheet and laying it on a floor, etc. '41 To spread a metal wire mesh, etc. on a floor, etc. Consideration has been given to placing it on the

However, these cases have the following drawbacks. In the case of '1}, pinholes, peeling, etc. are likely to occur, and there is a problem in the sustainability of the antistatic effect. In the case of '2', the color is limited to black due to the use of carbon black, and it is not only unsuitable for places that require coloring such as the clean room mentioned above, but also contains a large amount of carbon black, so it cannot be used for a long time. Friction causes carbon black contamination and limits the resistivity settings.
[In the case of 3', the antistatic agent made from the surfactant used may bleed onto the surface of the sheet, causing contamination, or the active agent may be lost during long-term use, reducing its effectiveness. There's a problem. In the case of '41, since metal is used, it has poor elasticity and is heavy, so it is inconvenient to handle as a workbench, flooring material, etc., and also poses electrical safety problems. The present invention eliminates the above-mentioned defects of non-electrostatic materials and semiconductive materials.

That is, the colorable semiconductive plastic structural material of the present invention contains thermoplastic synthetic resin and synthetic rubber as main components and has a volume specific resistivity in the range of 1 to 1 and 20 arcs. non-static plastic sheet, thermoplastic synthetic resin, synthetic rubber and 10 to 2% by weight
of carbon black and a conductive plastic sheet having a specific volume resistivity in the range of 1 to 1 pi○.The thermocompression-bonded integrally molded plastic structural material has an overall resistivity of 1 to 1 pi.・It is characterized by being a structural material having a volume specific resistivity controlled within an arc range. According to the present invention, there is provided a semiconductive structural material that can be freely colored and is made of a composite of a non-static material that can be colored freely and a conductive material without using a conductive filler or a surfactant. , is lightweight and can be molded into any shape, has a smooth surface with appropriate hardness and elasticity, and prevents the generation of static electricity with almost no loss of semiconductivity even after many years of use. Structural materials are provided. Next, specific examples of the present invention will be described based on the accompanying drawings.

FIGS. 1 and 2 show an example of a semiconductive plastic structural material that can be freely colored according to the present invention and is composed of two layers and three layers, respectively, and a and c in the figures are 1 and 1.

Corresponds to a non-static plastic sheet having a specific volume resistivity in the range of ~1 to 20 arc, where b is a commercially available 1 to 1
It corresponds to a conductive plastic sheet with a specific volume resistivity of Q and Q. A and b in FIG. 1 and a, b and c in FIG. 2 are integrally molded by thermocompression bonding. A and C can be colored freely and have a volume resistivity of 1. ~
The non-static plastic sheets of Nos. 1 and 20 are obtained by kneading and molding a thermoplastic synthetic resin and a synthetic rubber as main components, and may be the same or different. As the synthetic rubber that can be used here, for example, nitrile butadiene rubber (hereinafter referred to as NBR), hydrin rubber (CHR), etc. are particularly suitable. Examples of the thermoplastic synthetic resin include vinyl chloride, acrylic, methacrylic, and styrene resins, with polyvinyl chloride, polyacrylonitrile, styrene resin, Amo resin, polymethyl methacrylate, and the like being preferred. This thermoplastic synthetic resin has appropriate hardness and elasticity depending on the application, and has a specific volume resistivity of 1 to 20.
In order to control the skin, it is blended with synthetic rubber in a certain ratio, and a ratio of approximately 70:30 to 30:70 is appropriate. Outside this range, it becomes difficult to manufacture and is not suitable for use in the present invention. In addition, the thermoplastic synthetic resin and synthetic rubber that make up the military guiding plastic sheet in b are also used in a and c.
In addition to the resin and synthetic rubber, this sheet is obtained by blending carbon black in an amount of 10 to 20% by weight based on the total weight, kneading, and molding.

Examples will be described below to explain the invention.

The amounts in each example indicate parts by weight. Example 1 Using the following raw material formulations, they were kneaded with a pressure kneader and then heated with a hot roll to make a non-static plastic sheet with a thickness of 0.5/m.

NBR (medium/high nitrile) [NV-72 manufactured by Nippon Synthetic Rubber ■] 4-anchor polyvinyl chloride [Lyuron 80 Fertilizer L manufactured by Toyo Soda Kogyo ■]
60 parts colored pigment (cyanine green) 0.1 part stabilizer [TL-5000 manufactured by Sakai Kagaku ■] 2. SL-1000 manufactured by Sakai Chemical Co., Ltd.
1.5 parts anti-aging agent (non-staining) Oil (Antage F manufactured by Kagaku Kogyo ■) 0.2 parts Example 2 Using the following formulation, a sheet with a thickness of 0.5 days was made in the same manner as in Example 1. Ta.

NBR (medium-high nitrile) [same as example 1] 5-anchor polyvinyl chloride [same as example 1]
15 parts methyl methacrylate resin [Mitsubishi Rayon ■
P-551] 35 parts Colored pigment (yellow base)
0.1 part titanium oxide
5. Stabilizer (same as Example 1)
1.5 parts anti-aging agent (non-staining)
Same as Example 1] 0.2 parts Plasticizer (DOP) 3 parts The properties of each sheet obtained in the above example are as follows.

Note *1 - Volume specific resistivity was measured by a conventional method using VE-40 manufactured by Kawaguchi Denki ■.

*2 - A specimen of each sheet was rubbed 30 times with a flannel cloth, and the specimen was brought close to cigarette ash up to a distance of 30 cm, and the presence or absence of adhesion of ash to the specimen was observed.

Example 3 A colored semi-chargeable plastic sheet with a thickness of 0.5 skin/skin obtained in Example 2 above and a vinyl chloride conductive plastic sheet (thickness 2.0 skin/
Skin) [Ebiroso CM manufactured by Taihei Kagaku Products ■] with an area pressure of 4
A colored semiconductive plastic structural material was produced by thermocompression bonding and integral molding at a heating temperature of 165q0.

The properties of the obtained plastic structural material were as follows. Furthermore, similar results were obtained when the non-static plastic sheet obtained in Example 1 was used instead of the non-static plastic sheet in Example 2. Changes in specific volume resistivity over time between the colored plastic structural material obtained in Example 3 above and a conventional sheet prepared by mixing an antistatic agent into a thermoplastic synthetic resin were as follows.

Similarly, when the sheet of Example 1 was used, there was no change in resistivity over time. Next, we investigated the change in volume resistivity due to variations in the thickness of the colored non-charged plastic sheet and the conductive plastic sheet, and found that the thickness of the conductive plastic sheet was 1.0 to 2.5 m/skin. It was found that the desired effect was sufficiently obtained and it was practical. The experimental results are shown below. {i} In the case of the two-layer structure material of Example 3 [non-static plastic sheet 10 conductive plastic sheet [B}]'o} In the case of the three-layer structure material [non-static plastic sheet (A,) + conductive Curved plastic sheet + non-static plastic sheet (A2)], however, A and A are the same as A in [A] above, only the thickness is different, and B is the same as in the above case.

The colorable semiconductive plastic structural material of the present invention has 0
1. Electrical properties do not change due to changes in ambient temperature and humidity; ■ Carbon black is not used on the surface, so you can choose any chromatic color; for example, when used as a workbench for precision parts, etc. The parts can be easily distinguished even if they are black, and the flexibility and hardness of the glue can be freely selected.Since the thermoplastic synthetic resin is used, it is lightweight and has a smooth surface. It does not cause cracks or deformation even after many years of use, and 5) containers can be made in different colors, making it easier to sort precision parts, etc., and improving work efficiency.

Flooring materials used around electronic equipment that must particularly prevent the generation of static electricity.It is extremely useful as a material to prevent the generation of static electricity on workbenches for electronic equipment.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a semiconductive plastic structural material of the present invention consisting of two layers, and FIG. 2 is a cross-sectional view of a semiconductive plastic structural material of the present invention consisting of three layers. Traditional drawing 1 Leopard drawing 2

Claims (1)

[Claims] 1. A colorable non-static plastic sheet containing thermoplastic synthetic resin and synthetic rubber as main components and having a specific volume resistivity within the range of 10^1^0 to 10^1^2 Ωcm, and a thermoplastic synthetic sheet. Resin, synthetic rubber and 10~
Contains 20% carbon black and 10^3~1
A thermocompression-bonded integrally molded plastic structural material having a conductive plastic sheet having a specific volume resistivity in the range of 0^6 Ω·cm, and having a total resistivity of 10^6 to 10^9.
A semiconductive plastic structural material that can be freely colored, characterized in that it has a specific volume resistivity controlled within the range of Ωcm.