JPS62104749A - Manufacture of conductive high-molecular material having excellent abrasion resistance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a polymeric material having an electrically conductive surface layer with excellent wear resistance, which is useful as a functional material particularly in the electronic field.

[Conventional technology]

With the recent rapid development of the electronics-related field, the problems of electromagnetic interference and static electricity interference in electronics-related equipment have come to the fore. There is a strong demand for the development of transparent conductive films, transparent conductive plates, etc.

Conventionally, known methods for imparting conductivity to polymeric materials include methods such as attaching conductive metals or conductive metal oxides to the surface of polymeric materials by vacuum evaporation, sputtering, or the like.

[Problem that the invention seeks to solve]

However, a conductive layer formed on the surface of a material by vacuum evaporation, sputtering, or the like has the disadvantage that it is easily peeled off due to friction or the like.

In addition, polymeric materials generally have poor abrasion resistance and are easily damaged, and the abrasion resistance of conductive polymeric materials obtained by the above method cannot be improved. Methods for imparting abrasion resistance to materials include coating the surface of a polymeric material with a photocrosslinkable top layer and then photopolymerizing it; coating a solution containing a crosslinking monomer and a polymerization catalyst and then heating polymerization. However, it is difficult to form a thin film with a uniform thickness on the surface of a polymer material, and these methods have been used to create a conductive material with excellent conductivity and wear resistance. The problem is that it is difficult to obtain flexible polymer materials.

The present invention addresses the above-mentioned problems with conductive polymer materials according to the prior art, and particularly aims to solve the problems of conductive polymer materials using the prior art. The object of the present invention is to provide a method for improving the wear resistance of materials.

[Means to solve the problem]

The present invention involves treating a conductive polymer material with a conductive surface layer made of aluminum with an aqueous solution containing acidic sodium metaphosphate, and then heat-treating it in an aqueous solution containing a polymerizable melamine derivative compound and a polymerization catalyst. , a method for producing a conductive polymer material having excellent abrasion resistance, characterized by forming and fixing a melamine resin thin film having a crosslinked structure on a conductive surface layer.

The polymer material used in carrying out the present invention is not particularly limited as long as it has a conductive layer such as aluminum, and examples include polyester resin, acrylic resin,
Polymer materials made of acrylonitrile resin, ABS resin, polyvinyl chloride resin, polyvinylidene chloride resin, polycarbonate resin, polyamide resin, aromatic polyamide resin, polyimide resin, phenol resin, melamine resin, urethane resin, polysulfone resin, etc. Can be mentioned.

Further, the shape of the polymeric material used in the present invention is not particularly limited, but sheet-like materials such as films, plates, and coatings are preferred. Further, the method for forming the polymer material is not particularly limited, and any known method can be used.

Any known method such as vacuum evaporation, sputtering, etc. can be used to form a conductive layer made of aluminum on the surface of the polymeric material. Subsequently, the conductive polymer material coated by the above method is immersed in a room temperature solution containing 0.1% to 5% by weight of acidic sodium metaphosphate for several seconds to several tens of minutes, and then washed with water. In this case, the concentration of acidic sodium metaphosphate is 0.1
If the weight percentage is not dropped, aluminum will peel off from the surface of the polymeric material during the subsequent process of forming a melamine MI4 fat film, and its conductivity will be lost.

In addition, if the amount exceeds 5% by weight, 1l
No. 11: No effect of improving abrasion resistance was observed, making it unfavorable from an economic point of view.

This acidic sodium metaphosphate aqueous solution treatment of the conductive polymer material has the effect of improving the adhesion of the conductive layer made of aluminum to the polymer material during the subsequent process of forming the melamine resin thin film, and further improves the adhesion of the conductive layer made of aluminum to the conductive layer of the melamine resin thin film. The same effect of fixation as described above can be achieved very significantly.

In the present invention, the conductive polymer material obtained by the above method and treated with an acidic sodium metaphosphate aqueous solution is subsequently heat-treated in an aqueous solution containing a polymerizable melamine derivative compound and a polymerization catalyst.

The polymerizable melamine derivative compound used in the present invention is a reactive compound represented by the following general formula.

The concentration of the melamine derivative compound in the aqueous solution is 0.2M%
~3. A range of OM amount % is preferably used. concentration is 0
．． When the concentration is less than 1% by weight, the effect of imparting wear resistance to the conductive polymer material is poor, while when the concentration exceeds 3.0% by weight, the effect of imparting wear resistance to the conductive polymer material increases as the amount used increases. The effect of imparting wear resistance is not increased, which is not preferable from an economical point of view.

Generally known inorganic acids and organic acids are used as polymerization catalysts for melamine derivative compounds used in carrying out the present invention.
! or its salts can be used as is.

In this case, the amount of the catalyst to be used is 1 to 50% by weight, preferably 5 to 50% by weight based on the melamine derivative compound.

To form a melamine resin thin film on the conductive layer surface of a conductive polymer material using the melamine derivative treatment solution containing the polymerization catalyst described above, the polymer material with the conductive layer is immersed in the treatment solution at room temperature, and then treated. This is accomplished by heating the liquid while stirring.

The heat treatment in this case is preferably heated at elevated temperature, and the maximum temperature is preferably 800 or higher, but it is necessary to set the heat resistance treatment conditions for each polymer material in consideration of the heat resistance of the polymer material.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples.

Example 1 A transparent polyethylene terephthalate resin film with a thickness of 100 mm was coated with 0.0 mm of aluminum using a true nitrogen evaporation device.
06. F/77L2 vapor deposited, surface electrical resistance 4Ω/mouth,
A transparent conductive polyethylene terephthalate resin film having a light transmittance (wavelength: 550 mμ) of 20% was obtained.

This transparent conductive polyethylene terephthalate resin film was immersed in a 25C 0.5% by weight aqueous solution of acidic sodium metaphosphate for 50 seconds, then taken out and washed with water.

This film was immersed in an aqueous solution containing 2% by weight of 25C trimethylolmelamine and 0.4% by weight of acetic acid, heated to 70C at a rate of 10C/min while stirring, and then heated at 70C for 30 minutes. After treatment, wash with water,
A dry heat treatment was performed at 120C for 50 minutes using a hot air dryer to obtain a film in which a melamine resin thin film having a crosslinked structure with a thickness Q of 5sp was formed and fixed on the surface of the film.

The conductivity, transparency, and abrasion resistance of this film were measured.
The results shown in the table were obtained.

As a reference example, the performance of an aluminum vapor-deposited film before forming a melamine resin thin film is added.

Table 1: The above results show that the film of the present invention has excellent conductivity and transparency, and has excellent abrasion resistance compared to the ordinary aluminum vapor-deposited film that is not treated to form a melamine resin thin film as shown in the reference example. It can be seen that there has been a marked improvement in 5. The conductivity was measured in a 20C, 140% RH atmosphere.

Abrasion resistance was measured using a Gakushin type friction fastness tester, using cotton cloth as a friction element, and applying a load of 500 g/crrr'.
The number of times of friction at which the sample surface begins to be damaged by friction was measured and expressed as the wear resistance.

Comparative Example A melamine resin thin film formation treatment was performed in the same manner as in Example 1, in which the aluminum film obtained by the method of Example 1 was directly treated with an aqueous solution containing acidic sodium metaphosphate. The aluminum peels off and becomes colorless and transparent! ! Conductivity is completely lost.

〔Effect of the invention〕

The method of manufacturing a polymer material with a conductive surface layer such as aluminum, which has excellent wear resistance, according to the present invention, can be applied to many polymer materials, and can be applied to various polymer materials with excellent wear resistance. The present invention makes it possible to provide conductive polymer materials at low cost, and particularly contributes greatly to the development of electronic related fields.

Claims (1)

[Claims] A polymer material with a conductive surface layer made of aluminum is treated with an aqueous solution containing acidic sodium metaphosphate, and then heat-treated in an aqueous solution containing a polymerizable melamine derivative compound and a polymerization catalyst to make it conductive. A method for producing a conductive polymer material with excellent wear resistance, which comprises forming and fixing a melamine resin thin film having a crosslinked structure on a surface layer.