JPS6286066A - Transparent conductive coating - Google Patents

Abstract

PURPOSE:To obtain the title coating which gives a film having excellent transparency, conductivity, and antistatic properties, by mixing a resin with a fibrous transparent conductive substance prepared by coating a specified sepiloite or attapulgite with a substance containing an Sb component and SnO. CONSTITUTION:A fibrous transparent conductive substance (A) is obtained coating 100pts.wt. sepiolite or attapulgite (a) which has a length of 0.2-100mum preferably 1-30mum, a width of 0.8mum or less preferably 0.2mum or less, and an aspect ratio of 10-3,000 preferably 50-1,000, with 20-1,000pts.wt. substance (b) which comprises SnO and an Sb component containing 0.1-40wt% Sb. Then, 5-90pts.wt. component A is mixed with 95-10pts.wt. coating resin (B) (e.g., an acrylic resin) and, if necessary, a solvent and a surface agent are added thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a transparent conductive paint, and more particularly to a fiber made by coating sepiolite or attapulgite with specific physical properties with a conductive substance mainly composed of tin oxide. The present invention relates to a transparent conductive paint that is made transparent and has conductivity by mixing a specific proportion of a transparent conductive substance into the paint.

(Prior art) In recent years, there has been a rapid increase in the number of fields that require the use of the unique color of the base material and antistatic properties for electronic and electrical parts such as ICryA storage containers, measuring instrument covers, and general products such as packaging films. . For this reason, two methods have been taught: ■ Applying an ion-conductive organic substance such as an alkylamine halide, and ■ Applying a paint containing an inorganic conductive powder mainly composed of tin oxide to impart antistatic properties. ing.

However, although it is possible to obtain a transparent coating with antistatic ability in method (2), it has the disadvantage that a satisfactory antistatic effect cannot be obtained unless the humidity is high, and it is easy to peel off. In the case of this method, a large amount of conductive substance must be included in the paint in order to obtain a satisfactory effect, which is not only uneconomical but also has the fatal defect of reducing the transparency of the paint film. Ta.

(Problems to be Solved by the Invention) In view of the above circumstances, the present inventors have conducted repeated research in order to obtain a paint that is inexpensive, has excellent transparency and conductivity, and forms a coating film that has sufficient antistatic ability. As a result, when a transparent conductive material made by coating a specific fibrous inorganic material with a specific shape with a specific amount of tin oxide-based material is mixed into the paint in a specific ratio, a paint that can satisfy the above purpose is created. The present inventors have discovered that the following can be obtained, and have completed the present invention.

(Means for Solving the Problem) The present invention provides an antimony component for 1ooii part of sepiolite or attapulgite having a major axis of 0.2 to 100μ, a minor axis of 0.8μ or less, and an acicular ratio of 10 to 3000. 5 to 90 parts by weight of a fibrous transparent conductive material coated with 20 to 1,000 parts by weight of a substance containing 0.1 to 40% by weight and the remainder consisting of tin oxide, and 95 to 10 parts by weight of the resin in the paint composition. The present invention provides a transparent conductive paint characterized in that it is mixed in a total amount of 100 parts by weight.

The present invention will be explained in more detail below.

Sepiolite or attapulgite used in the present invention has fiber lengths of 0, 2 to 100 mm in length in microscopic observation.
[mu], preferably 1 to 30 [mu], a short axis of 0.8 [mu] or less, preferably 0.2 [mu] or less, and an acicular ratio of 10 to 3,000, preferably 50 to 1,000.

If the long axis of the fibers is less than 0.2μ, it is difficult to form a conductive path during coating film formation, and the required conductivity cannot be imparted.
If it exceeds 0μ, the smoothness of the coating film will be lost, which is not preferable. When the minor axis exceeds 0.8, transparency is decreased, which is not preferable. Furthermore, if the acicular ratio is less than 10, the effect of forming a conductive path using a fibrous material with a small amount of conductivity imparting agent cannot be achieved; on the contrary, if the acicular ratio exceeds 3000, In some cases, it is difficult to make them exist uniformly in the coating composition, and in addition, the smoothness of the plane deteriorates, which is not preferable.

The transparent conductive material of the present invention contains 0.1 to 40 weight %, preferably 2 to 25 weight % of an antimony component as Sb in 100 ffi of sepiolite or acpulgite having the above-mentioned physical properties, and the remainder is mainly tin oxide. It is obtained by coating 20 to 1000 parts by weight of a substance consisting of:

If the amount of tin oxide-based material applied to sepiolite or acpulgite is less than 20 parts by weight, it will not be possible to maintain good electrical conductivity, while if it exceeds 1000 parts by weight, the amount of tin oxide-based material applied will be insufficient to maintain conductivity commensurate with the amount of f32 applied. It has no sex-imparting effect and is not economical.

Antimony is added for the purpose of enhancing the effect of imparting electrical conductivity to tin oxide, and is mainly present in the form of an oxide.

The amount added to tin oxide is 0.1 as Sb. ffl amount%
If the amount is less than 40% by weight, the above-mentioned effects will not be exhibited, while if it is more than 40% by weight, the conductivity will decrease, which is not preferable.

There are no particular restrictions on the method of coating sepiolite or apulgite with a tin oxide-based substance; for example, 60 to 90
A predetermined amount of alcohol in which tin chloride and antimony chloride are dissolved is added to a suspension (in which sepiolite or attapulgite is dispersed in heated water of This is carried out by allowing the substance to form a precipitate, followed by filtering, washing, drying and calcining.

The transparent fibrous conductive material thus obtained is 5 to 50 parts by weight based on 95 to 10 parts by weight of the resin in the paint composition.
When added and mixed in a total amount of 100 parts by weight, a transparent conductive coating material can be obtained.

The paint applied in the present invention may be any known transparent paint, for example, a solvent such as alcohol, ester, ketone, ether, water, etc., and an acrylic, vinyl, carbonate, polyester, urethane, epoxy, or polypropylene paint. Examples include those made of paint-constituting resins such as.

If the amount of the transparent fibrous conductive substance added to the paint is less than the above range for the resin in the paint composition, the effect of imparting conductivity will be small, while if it exceeds the above range, the transparency of the resin will be impaired. At the same time, the binding function of the resin decreases, which is not preferable.

Anionic surfactants such as sodium dialkyl sulfosuccinate and sodium alkylnaphthalene sulfonate, and cationic surfactants such as stearyltrimethylammonium chloride are used to improve dispersibility in the paint when adding and mixing fibrous conductive substances into the paint. It is also possible to add a surfactant or an ester surfactant such as sorbitan monostearate, or to treat the conductive substance with the surfactant in advance and then mix it with the coating composition.

The fibrous transparent conductive substance-containing paint obtained in this way is
It can be used by a commonly known coating method, such as a spray method, a bar code method, or a doctor blade method.

(Examples of the Invention) The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples.

Example 1 Seviolite (Miraclay P300 Omi Mining Co., Ltd. 0 slope, trade name) with an average major axis of 2 μ and an acicular ratio of 100 (BET specific surface area of 300 n (/g)) 21.6 g was added to 3.6 β of water,
This was heated and maintained at a temperature of 70°C while stirring. While continuing to stir, a solution of 131.0 g of 'iR chloride (SnCQ) and 14.4 g of antimony chloride (S bc13) in 0.61 g of isobutyl alcohol was added to 200 g of isobutyl alcohol.
It was added slowly over several minutes to form a coating layer consisting of antimony oxide and tin oxide hydrate on the sepiolite surface. The mixture was then filtered, washed, dried, and then held and fired in the air at a temperature of 600° C. for 3 hours to form a fibrous filler.

The components of this filler are 7. antimony component and Sb.
6% by weight, and 72% by weight of tin oxide.

Next, 15 parts by weight of sodium dialkyl sulfosuccinate was added as a dispersant to 100 parts by weight of this fibrous filler, and after mixing in a 11 ball mill for 2 hours (the fibers after mixing were observed with a transmission electron microscope, the acicular ratio did not change. 10 parts by weight of butyl acetate, vinyl chloride-vinyl acetate copolymer (trade name: VAGI+, manufactured by Union Carbide)
To 1 part by weight, 1 part by weight of the above-mentioned fibrous 1-iller was added, mixed, and then applied to a polyethylene terephthalate film by a doctor blade method to a coating thickness of 4 μm. The surface resistance value and properties of the coating film thus obtained were measured and were as shown in Table 1.

Examples 2 to 5 A conductive fibrous material having the physical properties shown in Table 1 was obtained in the same manner as in Example 1, and then treated with a dispersant shown in Table 1 to form a coating composition shown in Table 1. A paint was obtained and the physical properties of this paint film were measured.

The results are shown in Table 1.

Comparative Example Sb content 9.4 in titania powder with average particle size 0.05μ
A paint was prepared in the same manner as in Example 1, except that a conductive powder coated with 440% by weight of tin oxide was used in place of the conductive fibrous material of Example 1, and the coating performance was measured. The results are shown in Table 1.

From Table 1, the paint of the present invention has excellent transparency, and compared to the conductive powder of the comparative example, even when a conductive substance with the same antimony and tin oxide content is added and present, the effect of imparting conductivity is lower. It can be seen that there is a clear difference.

(Effects of the invention) 2. The transparent conductive paint of the present invention detailed above has good transparency,
It has electrical conductivity and is made by adding and mixing a commercially available tin oxide-based conductive filler, a conductive filler made by coating a tin oxide-based conductive substance on a total oxide powder such as alumina, titania, silica, etc. Compared to paint, it not only has a significantly superior conductivity imparting effect per unit weight, but surprisingly, a filler in which alumina fiber, titania fiber, and silica fiber are coated with a tin oxide-based substance is added and mixed. Compared to paints, it not only has the above-mentioned effects but also has excellent transparency, and the present invention is of great industrial value.

Claims (1)

[Scope of Claims] 1) An antimony component is added to 100 parts by weight of sepiolite or attapulgite, which has a major axis of 0.2 to 100μ, a minor axis of 0.8μ or less, and an acicular ratio of 10 to 3000.
5 to 90 parts by weight of a fibrous transparent conductive material coated with 20 to 1000 parts by weight of a substance containing 0.1 to 40% by weight as b, the remainder being tin oxide, to the resin 95 in the paint composition.
-10 parts by weight, and the total amount is 100 parts by weight.A transparent conductive paint. 2) The major axis of sepiolite or attapulgite is 1~
30μ, minor axis 0.2μ or less, and needle ratio 50 to 10
00. The transparent conductive paint according to claim 1.