JPH032901B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-foamed material made of a non-static synthetic resin that prevents static electricity.

Non-foamed synthetic resins have been conventionally molded by injection molding, extrusion molding, press molding, etc., and are widely used as automobile bodies, bumpers, various instrument panels, building materials, and other industrial materials. Also,
In addition to these molded products, they are used in a wide range of applications such as chemical fibers, chemical papers, nonwoven fabrics, and flexible films. In this way, non-foamed synthetic resin materials have grown into essential materials for industry and daily life in modern society, but all non-foamed synthetic resin materials have a common characteristic of being electrostatically charged. Various problems have arisen. For example, when a non-foamed synthetic resin molded body is processed into an automobile part, the friction during processing causes it to become electrically charged and dust in the air adheres to the surface. There was a problem with uneven coating. In addition, the human body is charged with electricity due to clothing made of chemical fibers, and therefore, when the human body touches metal, the accumulated static electricity is discharged, and people often experience unpleasant electrostatic shocks on a daily basis. The various problems caused by static electricity as mentioned above have caused serious harm that cannot be ignored from a technical or social perspective, as non-foamed synthetic resin products are extremely widely used. There was a strong demand for non-foamed synthetic resin products.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a non-foamed body of a non-static synthetic resin that can eliminate various problems caused by charging.

That is, the present invention uses a polyolefin thermoplastic resin of 100% by weight and an ethylene oxide content of 15%.
An uncharged product containing a total of 10 to 70 parts by weight of the above polyether polyol and carbon black, and a weight ratio of the polyether polyol to carbon black is 1:9 to 9:1. It is a non-foamed polyolefin thermoplastic resin.

The polyolefin thermoplastic resin in the present invention is not particularly limited, and all currently used polyolefin thermoplastic resins such as EVA resin (ethylene-vinyl acetate copolymer resin), polyethylene resin, and acrylic resin may be used. Can be done.

Ethylene oxide content in the present invention: 15%
The above-mentioned polyether polyol and carbon black function as antistatic agents. The present invention eliminates the charging property of the synthetic resin non-foamed material through these antistatic effects. The above two types of antistatic agents are added in a combined amount of 10 parts by weight per 100 parts by weight of the thermoplastic resin or thermosetting resin.
If the amount is less than 70 parts by weight, the sufficient effect will not be obtained; conversely, if it is more than 70 parts by weight, the increase in the amount of carbon black added will cause a decline in physical properties such as weakening of strength, and the antistatic effect will be reduced. The effect reaches a plateau, and a large effect commensurate with the amount added cannot be obtained.

Of the two types of antistatic agents mentioned above, carbon black has been used conventionally, but the addition of carbon black has the problem of causing a decrease in physical properties as described above. The amount has to be effectively limited. The present invention uses polyether polyol with an ethylene oxide content of 15% or more as an antistatic agent together with carbon black, thereby reducing the amount of carbon black added and preventing deterioration of physical properties while achieving a greater antistatic effect. It is possible to obtain. In this case, the addition ratio between these two types of antistatic agents is preferably about 1:9 to 9:1 (polyether polyol:carbon black). As a result, the amount of carbon black added necessary to obtain the same antistatic effect can be suppressed to about 1/2 to 2/3 of that in the case of carbon black alone, and deterioration of physical properties can be prevented.

In the present invention, in order to obtain a more sufficient effect, it is desirable to use a polyether polyol having an ethylene oxide content of 50% or more. For example, polyoxyethylene propylene glycol is a polyether polyol with an ethylene oxide content of 75%, and is a preferred polyether polyol in the present invention.

Further, in addition to the above two types of antistatic agents, a greater effect can be obtained by using the general formula R ₄ NX (R is an alkyl group or an aryl group) as a third antistatic agent. As this quaternary ammonium salt, cationic quaternary ammonium salt ([C ₁₂ H ₃₅ N
( _CH3 ) ₃ ] _ClO4 : Trade name New Elegan A. New Elegan Al) is suitable.

The non-foamed non-static synthetic resin according to the present invention is
As shown in the results of the examples described below, there is so little chargeability that a normal static electricity measuring device cannot detect the amount of charge, so the problems caused by static electricity that have plagued non-foamed synthetic resin products can almost be completely eliminated. can be resolved. In addition, since it has almost no chargeability, it can be particularly applied to applications that require non-chargeability, such as electrostatic recording paper, spinning rolls, etc., to obtain remarkable effects. Furthermore, as shown in the results of the examples below, the non-foamed non-static synthetic resin according to the present invention can achieve a specific resistance value on the order of 10 ³ to 10 ⁶ , so it is suitable for use in semiconductor devices such as ICs. It can also be used in fields that require even stricter non-static properties, such as packaging, or as a so-called conductive resin material.

Examples of the present invention will be described below.

Example 1 ●High-density polyethylene resin 100 parts by weight (Mitsubishi Yuka JY-20) ●Horioxyethylene propylene glycol
100 parts by weight (3-tube polyether polyol with 75% ethylene oxide content; molecular weight 3000) ●Carbon Black 10 parts by weight ●Nipseal VN 20 parts by weight (Silica-based filler) Raw materials with the above composition were placed on a roll at 120℃. at 30
After kneading for a minute and making a 1mm thick sheet, 150mm
The four sheets were filled into a mold of 150 mm x 3 mm. This was heated at 140℃ for 15 minutes while being pressurized from above and below with a press at a pressure of 50Kg/ ^cm2 , and then the heated steam in the press was replaced with water and cooled for 2 minutes.
The mold was demolded at a mold temperature of 80°C.

Regarding the unfoamed molded high-density polyethylene resin obtained in this way, we first examined the initial charging voltage and its half-life using a static electricity measuring device.
It was below the measurement limit and undetectable. Next, when we measured its electrical resistance, the specific resistance value was 3×10 ⁵ Ω・
cm values were obtained.

Example 2 ●High-density polyethylene resin 100 parts by weight (Mitsubishi Yuka JY-20) ●Polyoxyethylene propylene glycol
20 parts by weight Carbon Black 20 parts by weight Nipseal VN ₃ 30 parts by weight (Silica-based filler) Using the raw material having the above composition, a non-foamed molded product of high density polyethylene resin was obtained in the same manner as in Example 1. Ta.

When the electrical resistance of this molded body was measured, it was found to be 2×
A specific resistance value of 10 ³ Ω·cm was obtained.

Example 3 ●Polystyrene resin 100 parts by weight ●Polyoxyethylene propylene glycol
10 parts by weight ●Carbon Black 15 parts by weight ●Nipseal VN3 5 parts by weight (Silica-based filler) Using raw materials with the above composition, heating conditions: 170℃ x 15 minutes,
The same procedure as in Example 1 was carried out with the demolding temperature being 60°C.

The electrical resistance of the obtained non-foamed polystyrene resin molded product was measured, and a specific resistance value of 1.0×10 ⁸ Ω·cm was obtained.

Example 4 ●ABS resin 100 parts by weight ●Polyoxyethylene propylene glycol
20 parts by weight ●Carbon black 20 parts by weight ●Nipseal VN3 5 parts by weight Using raw materials with the above composition, heating conditions: 180℃ x 15 minutes,
The same procedure as in Example 1 was carried out with the demolding temperature being 60°C.
A non-foamed molded body of ABS resin was obtained.

The specific resistance value of this molded body was 1.0×10 ⁶ Ω·cm.

In addition, although the above-mentioned examples were processed into molded bodies, similar results can be obtained when the molded bodies are processed into fibers, films, and the like.

As described in detail above, according to the present invention, it is possible to provide a non-foamed body of a non-static resin that has almost no chargeability and can also be used as a conductive resin material.

Claims (1)

[Claims] 1. 100% by weight polyolefin thermoplastic resin;
Contains a total of 10 to 70 parts by weight of a polyether polyol with an ethylene oxide content of 15% or more and carbon black, and the weight ratio of the polyether polyol to carbon black is 1:9 to 1:9.
A non-foamed body of a non-static polyolefin thermoplastic resin characterized by a ratio of 9:1. 2 The content of the polyether polyol is 10 to 20
parts by weight, and the content of the carbon black is 10
20 parts by weight of the non-foamed non-electrostatic polyolefin thermoplastic resin according to claim 1. 3. The non-foamed body of a non-static polyolefin thermoplastic resin according to claim 1 or 2, wherein the balance is 5 to 30 parts by weight of an inorganic filler. 4. The non-foamed body of a non-static polyolefin thermoplastic resin according to claim 3, wherein the inorganic filler is a silica filler.