Electrically conductive paint material

 

(57) Abstract:

The invention relates to the manufacture of electrically conductive paints and varnishes based on synthetic polymer film-forming binder and can be used in various industries to get on dielectric substrates of large area conductive film coatings with stable electrical characteristics over the entire area of the surface of the film coating. Primary use - electric heating equipment and systems for the most varied purposes. Electrically conductive paint material includes a synthetic polymeric binder, the carbon-containing filler, curing agent and an organic solvent. The carbonaceous filler it contains a mixture of graphite with soot when the mass ratio of carbon black to graphite 0,05:0,1, and as a synthetic polymeric binder - polymethylphenylsiloxane branched or cyclic structures in the following ratio, wt.%: synthetic polymer binder 7-17, carbonaceous filler 0,7-16,1, the curing agent is 2,5-5,5, organic solvent - rest. Primary temperature who is from 250 to 700oC. 1 table.

The invention relates to the manufacture of electrically conductive paint materials based on polymeric film-forming binder and can be used in various fields of technology for artificial film conductive coatings (resists) on large areas of the surface of articles intended for elektrocieplownia order, for example, heating the environment, mainly for artificial film conductive coatings with the temperature of the fuel surface from 250 to 700 on the respective surfaces of appliances such as hot plates, hair dryers for heating large areas, electric fireplaces, heaters for the disposal of industrial waste, etc.

Known electrically conductive paint on the basis of polymeric film-forming binder, which includes a solvent, a polymeric binder and fine conductive filler in the form of a mixture of silver (60-75% of the total mass of components) and graphite (0.5 to 10% by weight of the total components). The film of the paint coating from the known paint after drying has a specific volume resistance of the order of 103- 106ASM [1] High is antnee silver content, having a small resistivity in pure form (1,h-6Omcm), a paint and varnish covering almost impossible to provide direct intimate contact adjacent fine particles of silver to each other, as these particles during dispersion of the components in the manufacture of composition'm entwined polymeric binder, resulting in contact of adjacent particles of silver in the dried coating is carried out mainly through a layer of binder material.

The presence of the graphite particles in the composition contributes to a reduction in the specific resistance of the film of the paint coating of the above composition as fine particles of graphite, having a larger porosity in comparison with metals (particularly silver), is able to adsorb a binder and a solvent, thereby providing a tight direct contact of the adjacent surfaces of the graphite particles. However, if the paint composition of the silver particles, exceeding in size the pore size of the graphite particles in the dispersion process, these pores will be filled with metal particles (silver). The result would be a tight contact, that the total content of the graphite particles is a small fraction of the content in the paint composition of the silver particles, the specific volume resistance of the coating film will be limited mainly resistivity of the film-forming binder of the paint, which is several orders of magnitude higher than that of graphite and silver.

Calculations show that upon receipt of a film of the paint coating from the known composition on a substrate in the shape of a square of dielectric material with an area of 1 m at a coating thickness of 25 μm and applied to the appropriate areas of the coating voltage of 220 V (taking into account that the specific volume resistance of the coating film is 10 Omsm) on the sample will be allocated a power of about 2 watts.

Comparing this output with a capacity of, for example, a standard household oil cooler (800-1200 watts), having approximately the same area of heating surface, we can conclude that the known paint is not applicable for use in the manufacture of fuel (resistive) conductive surfaces of the heating device due to the very high specific volume resistance (103-106Omsm) film paintwork known the pleasure of its use mainly for space and aviation industry.

Known elektroprovoda dye-based polymeric film-forming binder, which composition also includes a solvent, a polymeric binder and fine electroconductive filler in a ratio of 40-80% by weight of the total composition (compositions). The conductive filler may be made of particles of graphite or carbon content of 10-50% by weight of the total composition (compositions) [2]

This is known conductive paint may contain an electrically conductive filler in the form of a mixture of fine metal particles and particles of graphite or only in the form of a graphite-containing material. The disadvantages of the known electrically conductive ink, in which the conductive filler is made in the form of a mixture of metal and carbon-containing particles described above. That is, in this case, the specific volume resistance of the coating film of this famous composition will be limited to the specific resistance of the polymer binder and to have a value on the order of 103- 106MSM that is not possible, as mentioned above, to use this film coating as fuel (resistive) element for the electric heating devices and systems.

Vypolnenija fine particles also will not provide the desired result, as to substantially reduce the specific volume resistance of the coating film of known composition requires not only the increase of the percentage of carbon-containing particles in the known composition of the paint, but also a certain percentage of pure carbon in these particles together with certain specific adsorption surface mentioned carbon-containing particles that are not provided in the known technical solution. Therefore, to obtain a resist film with a stable electrical and physical-mechanical characteristics of the entire area of the surface of the resistive coating on the basis of known composition (for various voltages in the circuit of the power source) is almost impossible. In addition, high concentrations of pure carbon known composition significantly reduces the mechanical strength of the film coating (resist) on the basis of known composition and, therefore, limits the scope of application of the coating due to its low durability.

Known composition for film resists, which forms a resistive material with stable physical and mechanical properties under the influence of povysheniya and 0.1-2 wt.h hardener (imidazole) per 100 wt.h binder [3]

A disadvantage of the known arrangement is that a high percentage of carbon-containing filler in the form of carbon powder (carbon black) adversely affects the mechanical strength of the film resists of this composition, which limits their use and reduces durability.

In addition, due to the use of known composition as a film-forming binder epoxydodecane resin film coatings based on them cannot be applied on a substrate of a flexible, elastic and soft materials, as these coatings have extremely low elastic characteristics (i.e. high modulus of elasticity), in relation to the above-mentioned materials of the substrate, and is not able to perceive long-term alternating bending or tensile loads, which greatly limits the scope of application of the known electrically conductive paint material.

Closest in quality to the composition and physico-mechanical properties to the proposed technical solution is electrically conductive composition comprising a saturated polyester resin, a diisocyanate, a solvent and a conductive filler, ri ratio of kaolin and graphite from 1 to 9 1 to 9 and optionally salicylaldimine copper in the following ratio of components, wt. including saturated polyester resin 100; 2, 4 toluylenediisocyanate 98-102; solvents 95-105; salicylaldimine copper 0,07-0,09; graphitized kaolin 120-190 [4]

The disadvantages of the known compositions is that the coating on the basis of their physico-mechanical properties cannot provide the specified parameters in the mode of tension 12-220 V and temperature mode of operation, exceeding the 100oC.

The resistivity of the electroconductive coating on the basis of known composition is quite high (from 0.5 to 106Ω), therefore, the normal operation of this electrically conductive coating may be provided only at a voltage of 220V and a rated operating temperature 60 - 70oC.

In addition, the optimum content of the conductive filler in the known compositions within 120-190 wt.h. by weight of the binder leads to loss of mechanical strength of the conductive coatings on the basis of known composition, which makes it nepreemlemo to obtain electrically conductive coatings on substrates made of soft, flexible or elastic materials.

Technology of production of known composition is quite complex, time consuming and expensive, topografi, moreover, after applying this composition to the substrate, the film formation on the substrate does not occur, therefore, the easiest and cheapest paint coating method known compositions is eliminated, and compressing the composition may not provide uniform coating structure quantitative ratio of the qualitative composition of ingredients per unit area of the coating and, therefore, does not provide the necessary stability of the electrical properties (in particular specific resistance) over the entire area of the surface of the paint coating on the basis of known composition.

The basis for the claimed invention was based on the task of creating such a conductive material, paint (paint), film coating (resist) on the dielectric substrate would be stable over the entire area of electrical characteristics, high mechanical strength, high elastic characteristics (elasticity) and low resistivity (10-3up to 10-4Omsm) that allows the use of a conductive coating on the basis of electrically conductive paint material as fuel (resistive is cnyh voltages in the circuit of the power supply and under different operating conditions, mainly on substrates of flexible, soft and elastic materials.

The task is ensured by the fact that the electrically conductive paint material, including synthetic polymeric binder, the carbon-containing filler, curing agent and an organic solvent, the carbonaceous filler comprises a mixture of graphite with soot when the mass ratio of carbon black and graphite 0,05:0,1, and as a synthetic polymeric binder polymethylphenylsiloxane branched or cyclic structures in the following ratio, wt. synthetic polymer binder 7-17; carbonaceous filler 0,7-16,1; the curing agent is 2,5-5,5; an organic solvent else.

The combination of the composition of a certain percentage of a polymeric binder and carbonaceous filler in conjunction with a specific ratio of net carbon and graphite in the specified filler provide intimate contact of all particles of carbonaceous filler obtained from patentable material, paint (paint) film coating. And this allows the resistivity of the film of the paint coating 10TES the ratio of net carbon and graphite in the carbon-containing filler in combination with the use as a film-forming binder polymethylphenylsiloxane allows you to increase the mechanical strength of the coating on the basis of the claimed compositions and to give it the necessary elasticity.

The method of obtaining the proposed electrically conductive material, paint (paint) and film electrically conductive coating on its basis is as follows.

All components (i.e. film-forming polymer binder, fine conductive filler, and an organic solvent) in the corresponding prescription the ratio of the load dispersing device and carry out the dispersion in accordance with technologically specified regulations. Then unload the contents and immediately before application to a substrate of dielectric material in the resulting composition is injected solution hardener in an amount of from 2.5 to 5.5 wt. composition (paint.)

As a dispersal device, you can use a ball or bead mill, a dissolver, a high-speed mixer. Apply the composition can be by brush, roller or pneumatic, electrostatic and airless spray, spray drenching, but the preferred aerosol technology application of the composition on the dielectric substrate.

To obtain electrically conductive material, paint (paint) as a binder, it is preferable to use >/P>As the solvent are aromatic hydrocarbons in a mixture thereof with ethers, alcohols, ketones, halogenated hydrocarbons. However, it is preferable to use particularly toluene (GOST 5789-78).

As curing agents are aliphatic amines and diamines, Quaternary monivae Foundation. However, it is preferable to use a curing agent methylsilanol brand CH-7-80 (TU-6-02-991-75), received ammonolysis of methyltrichlorosilane and clear in toluene.

As electroconductive carbon filler is carbon (soot) and graphite. It is preferable to use, for example, carbon brand P 268-e (TU 38.41579-83), or carbon brand P 803 (GOST 7885-86), or low-ash graphite (GOST 18191-E), or graphite powder purity (GOST 23463-79).

Carbon is produced thermal-oxidative decomposition of liquid hydrocarbons such as, for example, benzene, toluene, naphthalene at a temperature equal to or more than 1000oC.

May be replaced with a liquid raw material gaseous hydrocarbons, such as, for example, ethylene, propylene, propane, methane, or carbon monoxide. It is desirable that the content of pure carbon in the conductive at the.

The graphite particles have a branched structure, their predominant sizes of 0.3-30 nm, which increases the elasticity of the film coating on the basis of the patented compositions (paints).

The compositions of the conductive paint and varnish materials (compositions) specific conductive inks are presented in the table.

Example 1 (see tab. No. 1). The composition to obtain a film with a conductive coating that is used when the input voltage of the 12th Century

Example 2 (see tab. No. 2). The composition to obtain a film with a conductive coating that is used when the input voltage 110 Century.

Example 3 (see tab. No. 3). The composition to obtain a film with a conductive coating that is used when the input voltage of 220 C.

Experimentally verified that in each of the above examples of appropriate qualitative and quantitative composition of conductive inks for a given value of the applied voltage provides a heating temperature of the film coating (formed by this composition) in the range from 250 to 700oC.

Thus, the main advantages of electrically conductive paint Matroska has the following properties: low resistivity (10-3up to 10-4Omsm) that allows you to use as safe (12-36), and industrial (127-220 V) voltages when using a paint film coating as fuel (resistive) element, electric heating devices and systems; high adhesive ability, which allows to use a wide range of substrates including ceramics, refractory glass, primed metal surfaces, laminated plastics, rubber, etc., flexible, soft and elastic materials; the ability to create the heating surfaces of large area with stable electric characteristics and high heat dissipation; efficiency; the opportunity in the manufacturing process to obtain elektroteplovaya film with a specified output parameter heat loads (500 W/m2up to 5 kW/m2); the optimal conditions of heat transfer obtained elektroteplovaya films.

Electrically conductive paint material, including synthetic polymeric binder, the carbon-containing filler, curing agent and an organic solvent, wherein the carbonaceous filler it contains a mixture of graphite with soot when mass is a branched or a cyclic structure in the following ratio of components, wt.

Synthetic polymer binder 7 17

Carbonaceous filler 0,7 16,1

The curing agent is 2,5 5,5

Organic solvent Ostalnoe

 

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