JP2002066228A - Filter paper for fuel filtration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter paper for fuel filtration effectively preventing the generation of discharge of electrostatic charge by preventing the generation of electrostatic charge at the time when a fuel is passed through a filter paper of a fuel filtration device. SOLUTION: In the filter paper for fuel filtration device which comprises 100% of pulp or in which a chemical fiber such as a polyester fiber is mixed to a pulp, as an impregnated resin used for reinforcing the filter paper, an acrylic-modified phenol resin having a dielectric constant of 60 PF/m or less is used and a metal complex salt type paint such as of chrome and cobalt is used as a filter paper dye.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter paper for fuel filtration having a function of discharging static electricity to the outside (static charge preventing function).

[0002]

2. Description of the Related Art A fuel system of an automobile is provided with a fuel filter provided with a filter paper for fuel filtration on the way from a fuel tank to a fuel injector by a fuel pump. This fuel filtration device generally has a structure in which a filter paper for fuel filtration is housed as a filter material in a resin filter housing. In such a filter paper for fuel filtration, static electricity is generated during the passage of the fuel through the filter paper.In particular, in recent years, the demand for filter paper having a small passing particle size has increased, and static electricity due to friction between the fuel and the filter paper has been increased. Incidence tends to increase.

[0003] As described above, when static electricity is generated while passing through the filter paper, the resin housing is charged, and there is a possibility that static electricity is discharged from the resin filter housing to nearby metal parts. In some cases, cracks may occur in the resin filter housing due to the impact of the electrostatic discharge, which may cause fuel leakage.

As a countermeasure, it has been proposed to form a filter housing with a conductive resin and connect a ground wire to the filter housing to release static electricity and prevent discharge from occurring.

[0005]

However, there are actually the following technical problems. That is, in the conventional fuel filtration device described above, since the filter housing is formed of a conductive resin, if the ground wire is disconnected for some reason, or if the user forgets to connect the ground wire, the filter housing is disconnected. There has been a problem that electrostatic discharge is likely to occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to prevent the generation of static electricity when passing through a filter paper of a fuel filter, thereby effectively preventing the discharge of static electricity. The object of the present invention is to provide a filter paper for fuel filtration.

[0007]

In order to achieve the above object, the fuel filter paper according to the first aspect of the present invention is a fuel filter paper made of 100% pulp or a mixture of pulp and a chemical fiber such as polyester. Further, the impregnated resin used for reinforcing the filter paper is an acrylic-modified phenol resin having a dielectric constant of 60 PF / m or less.

According to this structure, the acrylic-modified phenol resin (novolak resin) has a low dielectric constant (PF / m) as shown in FIG. 1, and the dielectric constant (PF / m) as shown in FIG.
By impregnating the filter paper with a resin having low m), the charge amount (pc / g) can be kept low, and the generation of static electricity when passing through the filter paper of the fuel filter can be suppressed.

Furthermore, according to the filter paper for fuel filtration according to claim 1, wherein a metal complex type paint such as chromium or cobalt is used as the filter paper dye, as shown in FIG. The amount (pc / g) is reduced, and the generation of static electricity when passing through the filter paper of the fuel filter can be further suppressed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail. The filter paper for fuel filtration of the present invention is 100% pulp or a mixture of 5% to 50% by weight of polyester or glass fiber mixed with pulp to form a filter paper having a passing particle diameter of 5 microns. Acrylic-modified phenol in which the mixing ratio (weight ratio) of the resin and the acrylic resin comprising a copolymer containing at least one or more of acrylic acid, acrylonitrile, and acrylate is in the range of 95: 5 to 5:95. 15% to 22% resin (novolak resin) based on filter paper (weight ratio)
It is impregnated. Then, the filter paper thus formed is colored with a metal complex type paint containing chromium and cobalt.

In the above configuration, as shown in FIG.
Acrylic modified phenol novolak resin has a dielectric constant (PF
/ M) and a resin having a low dielectric constant (PF / m) as shown in FIG.
/ g) can be kept low, and the generation of static electricity when passing through the filter paper of the fuel filtration device can be suppressed low.

Further, by using a metal complex type paint such as chromium or cobalt as the filter paper dye, as shown in FIG. 3, the electrostatic charge (pc / g) is reduced, and the filter paper of the fuel filtration device is further reduced. The generation of static electricity when passing through can be suppressed.

[0013]

According to the above construction, a filter paper for fuel filtration in which pulp is 100% or a pulp mixed with a chemical fiber such as polyester is used. Since the modified phenol resin is used, the generation of static electricity when passing through the filter paper of the fuel filtration device can be suppressed low.Furthermore, since a metal complex salt paint such as chromium or cobalt is used as the filter paper dye, the static electricity is further reduced. Occurrence can be kept low.

[Brief description of the drawings]

FIG. 1 is a diagram of the dielectric constant of each resin according to the present invention.

FIG. 2 is a diagram showing a correlation between a charging rate and a dielectric constant according to the present invention.

FIG. 3 is a diagram of an electrostatic charge amount according to the present invention.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryohei Kozuka 3-12-3 Nakamachidai, Tsuzuki-ku, Yokohama, Kanagawa Prefecture Inside Tokyo Roki Co., Ltd. (72) Shingo Yokokawa 3-12 Nakamachidai, Tsuzuki-ku, Yokohama, Kanagawa Prefecture No. 3 Inside Tokyo Filter Co., Ltd. (72) Inventor Ryuji Kuwahara 3-12-3 Nakamachidai, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Inside Tokyo Filter Co., Ltd. (72) Inventor Junichi Ito 2749 Shinmachi, Tano-gun, Gunma Prefecture Tokyo Filter Paper Co., Ltd. (72) Inventor Hidemitsu Nishizawa 2749 Shinmachi, Tano-gun, Gunma Prefecture Tokyo Filter Paper Co., Ltd. (72) Inventor Ichiro Watanabe 700, Shukudaizamachi, Takasaki City, Gunma Prefecture F-term in Gunei Chemical Industry Co., Ltd. BA17 BB05 BC15 CB04 4D064 AA23 BM01

Claims (2)

[Claims] Claims 1. A filter paper for fuel filtration comprising 100% pulp or pulp mixed with a synthetic fiber such as polyester,
A filter paper for fuel filtration, wherein the impregnating resin used for reinforcing the filter paper is an acrylic-modified phenol resin having a dielectric constant of 60 PF / m or less. 2. The filter paper for fuel filtration according to claim 1, wherein a metal complex type paint such as chromium or cobalt is used as the filter paper dye.