Method for preparation of paste

FIELD: electronic engineering, applicable in production of gas-discharge indicating panels.

SUBSTANCE: use is made of pastes, in the production of process of which the filler powder is mixed and ground in and organic solvent taken in amounts respectively 1.5 to 245 percent by mass and 75 to 98.5 percent by mass. To improve the paste quality, the filler powder and organic solvent mix is agitated with addition of balls, 2 to 5 mm in diameter, taken in amounts of 60 to 100 percent of the mix mass,, for preparation of the paste use is also made of am organic binder heated to 45-65 C.

EFFECT: provided forming of components of the gas-discharge panel with a high degree of resolution.

3 cl, 3 ex

 

The invention relates to the field of electronic technology and can be used in the manufacture of gas discharge display panels (GUI).

There is a method of cooking pasta by mixing the powder filler and an organic binder on rolls specialized PISTOLEROS [Vggledningen, Restorer and other Thick-film microelectronics. - Kiev: Nauk. Dumka, 1983, s.162].

The paste produced in this way are not suitable for the formation of elements with a high degree of resolution, since the degree of milling (homogeneous mixing of the components of the paste) is great and the pasta has a separate agglomerates of size 10÷15 microns.

There is a method of cooking pasta by mixing the powder filler (dielectric material) and an organic binder in rotary, ball, roller mixers [Mevlevis, Biesiadecki. Paint and varnish materials. - M.: Chemistry, 1982, p.28].

This method has limited application because it allows you to make paste with low viscosity.

In addition, its disadvantages include the presence of large losses and return of waste, which is especially principally in the preparation of expensive pastes.

Closest to the proposed invention is a method of cooking pasta by preparing a mixture powder fill the El and an organic solvent, mixing and grinding the resulting mixture, the introduction of the organic binder [U.S. Pat. U.S. No. 4192698, 156-89, 1980 - prototype].

Although this method allows to obtain a paste with high homogeneity and plasticity, use them to get items with high resolution and small thickness, it is impossible because of the presence of powder filler agglomerates size of 8 μm or more.

The objective of the invention is to develop a method of cooking pasta for creating GUI elements with high resolution.

This technical result is achieved in that in the method of cooking pasta by preparing a powder mixture of a filler and an organic solvent, mixing and grinding the powder filler in the mixture, the introduction of the organic binder, the powder filler and an organic solvent in the mixture taken in amounts, respectively, equal to 1.5÷25 wt.% and 75÷98.5 wt.%.

Use for cooking pasta powder filler and an organic solvent, taken in a predetermined ratio, allows you to desegregationist powder filler to fine condition.

Use when mixing and grinding of the powder filler in an organic solvent balls, for example, made of glass with a diameter of 2÷5 mm, added SMEs 60÷ 100% of the total mass of the mixture of powder filler and an organic solvent further enhances the effect of desegregation powder of the functional material.

Use for cooking pasta is heated to a temperature of 45÷65°With an organic binder having at room temperature a low viscosity, which helps to eliminate agglomeration of the powder particles of the filler in the process of mixing.

Pasta, prepared on the basis of this method enables manufacture of the ISU increments the location of cells display 100 μm, the electrode thickness of 5÷10 μm, a width of 40÷50 μm, dielectric and a stabilizing coating thickness of 25÷40 μm and 1 μm, and the separation barriers 180÷230 microns.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, allows to establish that the applicant is not detected similar, characterized by symptoms that are identical to the characteristics of the claimed invention, and the definition from the list of identified unique prototype as the most similar set of features analogue has identified a set of essential towards perceived by the applicant to the technical result from uchitelnic signs in the claimed object, set forth in the claims.

Therefore, the claimed invention meets the requirement of "novelty".

To verify compliance of the claimed invention to the requirement of inventive step was conducted an additional search of the known solutions, in order to identify characteristics that match the distinctive features of the prototype of the characteristics of the claimed invention, the results of which show that the claimed invention is not necessary for the expert in the obvious way from the prior art, so as not identified ways of making pastes, which allows to obtain a homogeneous paste based on fine powders, in which there are no agglomerates with a size of 5 μm or more.

For the manufacture of the ISU high-resolution structural elements must be performed with a high degree of resolution. Special requirements to the surface quality of the dielectric coating, which should be smooth, smooth.

To fulfill these requirements in the manufacture of the ISU method of screen printing is provided in the use of powder filler with a specific surface area of 10·103÷40·103cm2/PM

Such powders during storage and cooking pastes glomerida. The size of the agglomerates can be comparable with the size of the Rami of structural elements of the ISU. To eliminate this drawback paste is prepared as follows.

Initially preparing a mixture powder of a filler and an organic solvent, taken respectively in amounts of 1.5÷25 wt.% and 75÷98.5 wt.%

Day pastes can be used in a variety of fillers - conductor, dielectric, resistive, phosphor materials or mixtures of these materials with low-melting glass and organic solvents - alcohol, acetone, organic solvents included in the organic binder pastes, and other chemically inert solvents.

After mixing conduct the mixing and grinding of the powder filler in an organic solvent. Due to colliding of agglomerates between a liquid medium and penetration of the organic solvent in the mouth of microdelay on the surface of the crushed agglomerates deformation of the agglomerates, the loosening of their structure. The agglomerates are beginning to crack and split into small particle size of 2÷5 microns.

If the amount of powder filler in the mixture is less than 1.5 wt.%, and organic solvent, respectively, more than 98.5 wt.%, in the mixing process with simultaneous grinding the concentration of the powder filler in an organic solvent is so small that not p is oshodi colliding agglomerates between themselves and the process of crushing of agglomerates difficult.

If the amount of powder filler is more than 25 wt.%, and organic solvent, respectively, less than 75 wt.%, then, as the specific surface of the powder filler is large, the liquid phase in the mixture is not sufficient for wetting the adsorption layer of the liquid particles of the powder.

To improve the process of mixing and grinding the powder filler in an organic solvent in the mixture add balls with a diameter of 2÷5 mm Introduction balls contributes additional mechanical destruction of friction between agglomerates. The use of balls with a diameter of 2÷5 mm allows to obtain the optimal value of the friction surfaces of the balls with the milled powder filler.

The use of balls of diameter less than 2 mm "sageset" mixture of powder filler and an organic solvent. The mixture becomes less mobile in the mixing process and the effect of grinding is missing.

The presence of a mixture of balls with a diameter of more than 5 mm decreases the magnitude of the friction surfaces of the balls with the milled powder of the drive.

To achieve good mixing with the simultaneous spreading of the powder filler amount is added to the mixture balls should be 60÷100% of the total mass of the mixture of powder filler and an organic solvent.

The presence of a mixture of balls is less than 60% of the total the amount of powder filler and an organic solvent does not give the desired effect crushing of agglomerates, as the mixing process is not optimum friction surfaces of the balls and the powder filler.

Adding balloons to more than 100% are not technologically feasible, so as not to increase the dispersibility of the powder filler.

After mixing and grinding the powder filler in an organic solvent mixture is passed through a sieve to separate the balls.

On the basis of a prepared mixture of powder filler and an organic solvent to prepare a paste with the introduction of its organic binder.

The organic binder can be introduced into the mixture of powder filler and an organic solvent, obtained after mixing and grinding, in which the number of parts corresponds to the initially taken for mixing or after partial removal of the organic solvent from the mixture, for example, by draining or by using a syringe. With partial removal of the organic solvent significantly reduces the time of mixing the paste, which will completely remove the organic solvent.

To exclude the effect of formation of agglomerates when mixed with an organic binder is added to the mixture warmed to 45÷65°C.

If the mixture of powder filler and an organic solvent to add organic binder is e, heated to a temperature of less than 45°C, the difference of viscosity of organic solvent and organic binder, the process is reversed, i.e. the aggregation of the filler, as it begins to form groups around viscous drops added organic binder.

If the temperature of the organic binder will be over 65°s, then there is alignment viscosity organic binder and an organic solvent. The process in this case is not getting worse, but is dangerous for the health of the operator due to intensive evaporation of volatile, toxic organic components of the binder.

Specific example 1.

For the manufacture of separation barriers between the electrodes of the ISU AC was cooked pasta, in which the filler used powder of one of the fusible glass: S-3, S-5, S-3 with a specific surface area of 9÷12·103cm2/g and alund cuota with a specific surface area of 10÷11·103cm2/g, taken in a 1:1 ratio.

From 20 wt.% powder LPS and alund cuota and 80 wt.% the organic solvent is isopropyl alcohol was prepared mixture with the addition of glass balls with a diameter of 3 mm in the amount of 70% of the total mass of the mixture, which was loaded in the roll mill. After mixing and grinding receive the n homogeneous fine powder filler, it was missing agglomerates with a size of 5 μm or more. Then mix with glass balls was passed through a sieve with mesh size 20÷40 μm, was added to the organic binder - 5% solution of ethyl cellulose (EC) in terpineol heated to a temperature of 50°and in specialized Pasternak were stirring until smooth with simultaneous removal (evaporation) of an organic solvent.

After mixing was obtained paste with evenly dispersed, desagglomeration in organic binder powder filler.

Separation barriers formed on the basis of made pasta, have a smooth surface without protrusions, depressions.

Specific example 2.

In the process of manufacturing the ISU AC for the formation of the electrodes was cooked pasta, in which the filler used a mixture of gold powders with a specific surface area of 10÷12·103cm2/g and a low-melting glass S-3 with a specific surface area of 8÷10·103cm2/, While the proportion of powder gold to low-melting glass was 18:1.

Then from 25 wt.% powder filler and 75 wt.% the organic solvent is isopropyl alcohol was prepared mixture with the addition of glass balls with a diameter of 5 is m, taken in the amount of 60% of the total mass of the mixture, which was loaded in the roll mill. After mixing and grinding the resulting homogeneous fine powder filler, which did not contain agglomerates with a size of 5 μm or more.

The mixture is then powder filler and an organic solvent with glass balls was passed through a sieve with mesh size 20÷40 μm, the powder was defended for 20÷40 min, and merged some of the organic solvent.

Next to cooking pasta to the mixture were added an organic binder - 6% solution of EC in terpineol heated to a temperature of 45°and was conducted by the uniform mixing of the mixture with simultaneous removal of organic solvent from the paste.

After mixing the paste with evenly dispersed, desagglomeration in organic binder powder filler. Electrodes formed of made pasta, have a width of 40 μm, a thickness of 5÷10 μm, with a surface free of projections and depressions.

Specific example 3.

For formation of the phosphor coating of the ISU was used phosphor paste, which was made as follows: 17 wt.% powder filler - phosphor with a specific surface area of 10÷12·103cm2/g - mixed with 83 wt.% ethyl alcohol. In recip is nnow mixture was added glass balls with a diameter of 2 mm in the amount of 100% of the total mass of the mixture and were stirring roller mill. Then the mixture of phosphor powder and an organic solvent with glass balls was passed through a sieve with mesh size 20÷40 μm, the powder was defended for 20÷40 min and removed some of the organic solvent.

Next to cooking pasta to the mixture were added an organic binder - 6% solution of EC in terpineol heated to a temperature of 65°S, and uniformly mixed with organic binder and the phosphor powder with simultaneous removal of residual organic solvent.

This paste was formed phosphor coating width of 70 μm and a thickness of 6 μm. The coating has a surface on which no surface roughness, which is observed when applying the paste, composed of agglomerates with a size of 5 μm or more.

The absence of roughness of the coating provides a uniform brightness of the phosphor on the whole field display GUI.

Thus, the present invention allows to prepare the paste used for the formation of structural elements of the ISU with a high degree of resolution.

1. The method of cooking pasta by preparing a powder mixture of a filler and an organic solvent, mixing and grinding the powder filler in the mixture, sift the mixture through a sieve to remove part of the organic process is Italia, the introduction of the organic binder, characterized in that the powder filler and an organic solvent in the mixture taken in amounts, respectively, equal to 1.5÷25 wt.% and 75÷to 98.5 wt.%.

2. The method of preparation of the paste according to claim 1, characterized in that the mixing and grinding of the powder filler in the mixture is carried out with the addition of balls of diameter 2÷5 mm, which is 60÷100% by weight of the mixture of powder filler and an organic solvent.

3. The method of preparation of the paste according to claim 1 or 2, characterized in that before the introduction of the organic binder it is heated to a temperature of 45÷65°C.



 

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