JPH06128411A - Electrically conductive flame-retardant resin composition - Google Patents

Abstract

PURPOSE:To obtain an electrically conductive flame-retardant resin composition capable of providing excellent conductivity and flame retardance without increasing viscosity of a resin composition. CONSTITUTION:This electrically conductive flame-retardant resin composition is obtained by mixing 100 pts.wt. thermosetting resin with 20-200 pts.wt. scaly acid-treated graphite.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a conductive flame-retardant resin composition, and more particularly to a conductive flame-retardant resin composition excellent in conductivity, flame retardancy and workability.

[0002]

2. Description of the Related Art Floor paints, petroleum
For lining materials for organic solvent storage containers such as gasoline,
It is necessary to be electrically conductive in order to prevent the risk of ignition of the contents stored in the semiconductor memory due to the generation of static electricity or sparks of static electricity, and it is preferable that the material is flame-retardant in case of a fire. Conventionally, as a method of imparting conductivity to these paints and lining materials, a method of mixing a conductive substance such as metal powder, metal fiber or carbon powder is well known. As a method of imparting flame retardance,
Compounds containing bromine and phosphorus, for example, hexabromobenzene, a method of incorporating a flame-retardant compound such as trisclodylethyl phosphate into a resin composition, a flame-retardant resin obtained by modifying a thermosetting resin with bromine, such as tetrabromo. A method using an unsaturated polyester resin using phthalic anhydride as an acid component, an epoxy resin using tetrabromobisphenol-A as a starting material, or the like is generally performed.

However, in order to satisfy both conductivity and flame retardancy at the same time, it is necessary to mix a large amount of a conductive substance or a flame retardant compound into the resin composition. There was a problem that it deteriorated.
Further, there is a problem that the flame-retardant compound that interferes with the contact cannot be mixed in a sufficient amount because the conductivity cannot be obtained unless the conductive compounds are in contact with each other in the resin. Further, when the flame-retardant substance is introduced into the resin by modification or the like, there is a limit to the amount of the substance to be introduced, and there is a drawback that high flame retardancy cannot be obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and is capable of imparting excellent conductivity and flame retardancy without increasing the viscosity of the resin composition. A fuel resin composition is provided.

[0005]

According to the present invention, flake-like acid-treated graphite of 20 to 2 is added to 100 parts by weight of a thermosetting resin.
The present invention relates to a conductive flame-retardant resin composition containing 100 parts by weight. The scaly acid-treated graphite used in the present invention is obtained by acid-treating graphite. As the graphite, generally known natural graphite, quiche graphite, artificial graphite such as pyrolytic graphite and the like can be used, but natural flake graphite such as flake graphite is easily available.
te), Vein Graphi
te) and the particle size is 80 mesh or more, preferably 50
It is preferable that the mesh or more is used and the shape is thick flake shape because the washing operation can be efficiently performed. The acid treatment is performed by immersing graphite in a mixed solution of sulfuric acid and nitric acid, performing an oxidation treatment, and then p
It is performed by washing with water until the H value becomes 4 to 7.
The acid-treated graphite has excellent flame retardancy because it absorbs heat at a high temperature of, for example, 200 ° C. or more and rapidly expands in volume. The shape of the acid-treated graphite mixed in the thermosetting resin composition is flake-like in terms of conductivity and ease of mixing. The size of the flakes is not particularly limited, but a particle size of 80 mesh or more is preferable from the viewpoint of kneading property. The amount of the flake-like acid-treated graphite mixed is in the range of 20 to 200 parts by weight, preferably 50 to 150 parts by weight, based on 100 parts by weight of the thermosetting resin composition, from the viewpoint of conductivity and flame retardancy. Is preferred.

As the thermosetting resin used in the present invention, any resin composition which is cured by heat such as unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin or furan resin can be used. From the viewpoint of facilitating the mixing operation, unsaturated polyester resin, vinyl ester resin, phenol resin and the like which are liquid at room temperature are preferable. In order to impart higher flame retardancy, a flame-retardant unsaturated polyester resin, vinyl ester resin or the like can be used.

The method of mixing the acid-treated graphite with the thermosetting resin is not particularly limited, and for example, a method using a stirrer, a method using a kneader such as a kneader, or the like can be used.
If necessary, the conductive flame-retardant resin composition of the present invention may be mixed with a curing accelerator for a thermosetting resin, a curing agent, a coloring agent, a lubricant, and the like.

[0008]

EXAMPLES The present invention will be described in detail below with reference to examples. The parts in the examples mean parts by weight, and% means% by weight. Example To 100 parts of Polyset-5595-APT (unsaturated polyester resin, manufactured by Hitachi Chemical Co., Ltd.), 100 parts of scaly acid-treated graphite was added and mixed well with a stirrer. This flake-shaped acid-treated graphite is 100 g of flake-shaped natural graphite from China, which has a peak at 35 mesh with fixed carbon content of 97%, ash content of 1%, and volatile content of 2%, concentrated sulfuric acid (95%) 300 g and nitric acid (60%). (~ 62%) was soaked in 100 g of a mixed acid solution at room temperature for 15 hours, washed with water so that the pH value became 6, and then suction-filtered to prepare a water absorption of 25-35%. Furthermore, 55 parts by weight of methyl ethyl ketone peroxide (2 parts) was added and stirred further to obtain a putty-like resin composition. This resin composition was applied to a glass plate having a release agent applied thereon in advance using a gold soldering iron so as to have a thickness of 1 mm, followed by curing at room temperature for 60 minutes, and then at 40 ° C. for 1 hour.
After curing for 2 hours, a resin plate having a thickness of about 1 mm was obtained. This thickness 1
mm resin plate is cut to a width of 12.7 mm and JIS K 69
A flame retardance test was conducted according to 11 (5.24 flame resistance, 5.24.1A method), but it was nonflammable. Also, the thickness is 1mm
When the conductivity of two arbitrary points separated by 1 cm or more on the surface of the resin plate was examined by a tester, it was 0.4 to 0.6Ω and there was conduction.

Comparative Example Polyset-5595-APT (same as above)
2 parts of 5 wt% methyl ethyl ketone peroxide was added and well stirred to obtain a resin composition having a viscosity of 0.3 Pa · s. A mold release agent was applied in advance to this resin composition, which was then poured onto a glass plate having a weir of 1 mm in height, which was cured for 60 minutes at room temperature and then for 12 hours at 40 ° C. A resin plate of about 1 mm was obtained. When this resin plate having a thickness of 1 mm was subjected to a flame retardant test in the same manner as in Example 1,
It was flammable. Further, the conduction of two arbitrary points on the surface of the resin plate separated by 1 cm or more was examined with a tester, but the tester showed ∞Ω and did not show conduction.

[0010]

The conductive flame-retardant resin composition of the present invention has high conductivity and flame retardancy without causing deterioration in workability due to high viscosity.

Claims (1)

[Claims] 1. A conductive flame-retardant resin composition obtained by mixing 20 to 200 parts by weight of scaly acid-treated graphite with 100 parts by weight of a thermosetting resin.