JPS596235A - white conductive material - Google Patents

Abstract

PURPOSE:To provide an electrically conductive white material having an excellent reinforcing effect on plastics, etc., consisting mainly of fibrous potassium titanate whose surface is covered with stannic oxide. CONSTITUTION:An electrically conductive white material consists mainly of fibrous potassium titanate whose surface is covered with stannic oxide. Potassium titanate of the formula K2O.nTiO2.mH2O (wherein n<=8; m<=) is used. Among them, potassium titanate of the formula K2O.6TiO2.mH2O and its hydrate are particularly preferred because they have excellent resistance to fire and heat and mechanical properties and further give excellent surface smoothness when used as a filler. Potassium titanate is generally powder or fibrous microcrystal, and those having a fiber length of 5mum or longer and an aspect ratio of 20 or above, particularly 100 or above, are suitable for use as a reinforcing filler. When a trace amount of antimony or indium is purposely added during the formation of stannic oxide layer, the electrical conductivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a white conductive material that has an excellent reinforcing effect on plastics and the like.

With the development of science and technology and the diversification of needs, the development of high-performance, multi-functional elementary materials is actively being carried out, and even in the plastics industry, various research efforts are being made on the development of conductive polymer materials. For example, polymer materials using carbon particles or fibers or metal powders such as copper, silver, gold, etc. as conductive fillers have been proposed. However, carbon particles, carbon fibers, and metal powders such as copper, silver, and gold are all black or have a color unique to metals, and these conductive fillers, except for carbon fibers, are non-reinforcing. It is a filler. In addition, although carbon fiber is a reinforcing conductive filler, it is difficult to make the fiber length uniform, and the aspect ratio is uneven, resulting in poor moldability and poor molding properties. Poor smoothness and polishability.

In view of the above-mentioned circumstances, the inventors of the present invention have developed a conductive composition, a titanate having a metal coating, a method for producing the same, a method for producing a reduced alkali titanate, etc. using potassium titanate, and a filling material with excellent heat resistance and reinforcing properties. Although agents have been developed and applications are being filed, all of these are colored, making it difficult to apply them to applications where a white or pale color is desired. In view of the current situation, the present inventor has arrived at the present invention as a result of intensive research.

That is, the present invention provides a white conductive material whose main component is fibrous potassium titanate whose surface is coated with stannic oxide.

In the present invention, °C1 potassium titanate is a well-known compound represented by the general formula KO・nTiO2・mH20 (in the formula, n means a positive real number of 8 or less, and m means 0 or a positive real number of 4 or less). Yes, conventionally divided into hydrothermal synthesis methods,
It is manufactured using a flux method and a sintering method.

In particular, potassium titanate and its hydrate, represented by the general formula 20.6T102.mH20 (in the formula, m is the same as above), have excellent fire resistance, heat insulation properties, and mechanical strength, and have been used as fillers (1 ;1. It is advantageous in that it has excellent surface smoothness.

Potassium titanate is generally a powder or a male-like microcrystalline body, but among these, the fiber length is 5 μm or more, the aspect pressure is more than 10 μm, and especially 10
0 or more is suitable as a reinforcing filler IJ'↓ agent.

Potassium titanate in the present invention is white and 7+'
It can be used in combination with f coloring agent to create any color tone.

In order to obtain the curved object of the present invention, it is preferable that the reinforcing conductive material be separated into short fibers (fine fibrous) as the reinforcing conductive material. Advantageously, the potassium titanate is coated with stannic oxide. For example, aqueous stannic chloride, alcohol/I
/ Aqueous solutions or dispersions containing organic solvents such as Fukai or Alco-JVs, polyhydric alcohols, water-soluble aldehydes, etc.
using f, 20 (1-900゛C1 preferably 400~
Spraying on the surface of potassium titanate heated to 800C and then reheating it. Spray coating method in which stannous oxide is deposited and coated on the surface of C1 potassium titanate i. Explosion of potassium titanate using a fluidized bed in a non-oxidizing atmosphere. , suspended state,
Alternatively, a chemical vapor deposition method in which a heated F tin compound is introduced in a settled state, and if necessary, moisture or oxygen is introduced to deposit stannic oxide on the surface of potassium titanate; after potassium titanate is made into paper or molded. The so-called physical vapor deposition method, in which tin oxide is vaporized under reduced pressure and heated at F, and deposited on the surface of potassium titanate, can be applied.

Note that any compound can be considered as a tin compound that can be applied to these methods, ignoring the complexity of the process.
Stannic chloride or its hydrate is advantageous because it has low toxicity, is stable, and the treatment process is easy to control.

In the present invention, when forming the second oxide coating layer, it is also possible to artificially add a small amount of antimony, indium, etc. to improve the conductivity.

Akira Motoya's guidance? ``Potassium titanate is currently in practical use plus 1-plus examples (f, polyedalene, polybu-1-pyrene, nibu-V-propylene diene polymer, polyester, 1-kl, polyamide resin, phenolic resin, Amino resin, epoxy resin, polyneedle wood
It mixes well with polyimide resin, triacetal resin, polyethylenete 1/phthalate resin, polysulfone resin, polyethersulfone resin, etc., and has excellent conductivity and improved mechanical strength. It becomes a nine-white composite material. Moreover, these composite materials have excellent cutting, polishing properties, and flat surface smoothness.

In addition, the conductive potassium titanate of the present invention can be used in combination with a suitable polymeric binder to produce conductive paints, conductive inks, conductive adhesives, conductive tapes, conductive sheets,
It can be applied to various uses such as conductive adhesives.

As described above, the present invention provides a conductive material that is easy to manufacture and has excellent post-processability. White conductive filler: A reinforcing conductive filler of any color with excellent heat resistance and surface smoothness can be created by combining conductive materials.

The present invention will be specifically described below with reference to Examples.

Example 1゜Stannic chloride (8n CJ a ・5 H20) 80
An aqueous solution of stannic chloride in which 1 part is dissolved in 1 part of deionized water is added to A.
I arranged it.

Next, spread 1f of potassium titanate (Teismo D1 Otsuka Chemical Co., Ltd.) on a magnetic plate to a thickness of 1 cup, and
Potassium titanate was heated to 750'' while vibrating on a sand pass using zircon sand adjusted to oo-c, and the above-mentioned treatment liquid was sprayed onto the surface of potassium titanate using a simple hand sprayer.

When spraying, 1 wl of treatment solution is sprayed at a time, at intervals of 5 seconds, so that a 2-volume meter can withstand 24 sprays, and then for an additional 3 minutes. After maintaining the temperature at 50°C, the mixture was transferred to a drying oven adjusted to 300''C and aged for 3 hours to obtain a white, fine fibrous conductive potassium titanate powder.

The conductivity was evaluated using a tablet molding machine (100 kt).
/c4 pressure, molded under reduced pressure to have a diameter of 11ff and a thickness of 3.
We created a resistant tablet and evaluated it by measuring its surface resistance.

The results are shown in Table 1. For comparison, stannic oxide (Hirai Chemical Co., Ltd., reagent special grade) and potassium titanate 1,0
Tablets were made using a mixed dispersion of f and stannic oxide, and their conductivity was evaluated. The results are also shown in Table 1.

Table 1 Example 2゜Samples 21 to 25 were prepared in the same manner as in Example 1, except that the heating temperature and post-treatment temperature of potassium titanate during spraying of the stannic chloride solution were changed to the conditions shown in Table 2. .

The evaluation of conductivity is shown in Table 2.

Table 2 Example 3゜Stannic chloride (S n Cl<・5H20) 8
0 parts methyl alcohol #20 parts alcoholic solution of stannic chloride (solution A) Antimony chloride (Sb (J15) 3.5 parts methyl alcohol) v 96.5 parts alcoholic solution of antimony chloride (Bfi ) A solution) B solution) were adjusted as above to create a treatment solution having the mixing ratio of A solution and B solution shown in Table 3, and then using potassium titanate (Tismo L1 Otsuka Chemical Co., Ltd.). Thereafter, the surface of potassium titanate was treated with the mixed solution in the same manner as in Example 1 to obtain white, fine fibrous conductive potassium titanate powder exhibiting the various conductivities shown in Table 3.

Table 3

Claims (1)

[Claims] ■ A white conductive material whose main component is fibrous potassium titanate whose surface is covered with stannic oxide.