Organic binder metallization pastes for conductive coatings

 

(57) Abstract:

Usage: in the process of metallization of the contact surfaces of components including a multilayer ceramic chip capacitors for surface mount. The invention is directed to solving the task of creating organic binder metallization pastes to obtain a coating of the contact surfaces having a high mechanical strength in newagenda condition that will allow the metallized ends of the capacitors in the multi-tape machines. The inventive organic binder metallization pastes for the conductive coating contains ethylcellulose, dibutyl phthalate, terpineol, castor oil, rosin, gliftalevye resin and stearic acid, with dibutyl phthalate and castor oil taken in the ratio of 1 : 1, with the following content, wt.%: ethylcellulose 2,9 - 3,1, a mixture of dibutyl phthalate and castor oil in a ratio of 1 : 1 17,2 - 20,8, terpineol 47,7 - 67,9, rosin 1,5 - 10,7, gliftalevaja resin 10,2 - 14,0, stearic acid 1.5 to 2.5. table 2.

The invention relates to electronic devices and can be used in the process of metallization of the contact surface

Paste intended for metallization of the contact surfaces after viginia should provide the thickness, the density of the coating and its geometrical dimensions. The quality of the contact of the coating is determined not only physico-chemical properties of metal powders introduced into the metallization paste, but also the properties of the organic binder, and a method of applying a paste.

The organic binder must be capable of rheology, stability in time, hiding power, the desired thickness, appearance, time and temperature of drying of the coating, as well as a high content of metal pastes for providing stability to the dissolution of surface coverage in the solder when soldering dual wave for a long time ( 6-8 s temperature 2605aboutC).

Rationally selected recipe organic binder provides for a process of film formation, and ultimately leads to coatings with desired physical and mechanical properties.

The stability of the ORGANOMETALLIC suspensions is determined by the ratio and the interaction of metal-polymer, metal-solvent, polymer-solvent, and depends in addition to the dispersion of openu of solvation of the surface of the metal particles in the presence of high-molecular compounds.

In sustainable systems, the precipitation of the metal particles is prevented by the presence of spatial structure of the polymer. Structuring paste is the result of interaction between the polymer and particles of metal, which hosts the emerging spatial lattice.

For each system metal-organic binder, there is a concentration optimum. He is considered as the limit of saturation macromolecules adsorption centers on the metal surface.

Known organic binder for metallization pastes containing ethylcellulose, dibutyl phthalate, lanolin, terpineol and the mixture polietilenglikolya esters of monooleate of anhydromannitol General formula [1].

Known binder provides good rheological properties of the pastes prepared on its basis, as well as a stable viscosity over time.

However, the experience of foreign firms and conducted tests show that in order to ensure resistance to dissolution of the coating in the molten solder for a long time in the paste must be at least 72% of the metal.

A disadvantage of the known binders and is impossible to introduce into the recipe of pasta metals in more than 70%, mo is ipoe.

In addition, pastes on the basis of this binding is only suitable for metallization manually and are not suitable for metallization on the machines, as they require long drying ( 40 min) and temperature of drying above 240aboutC.

Closest to the proposed and accepted by the authors for the prototype is an organic binder for metallized pastes external electrodes of the ceramic multilayer capacitors containing ethylcellulose, dibutyl phthalate, liquid paraffin, stearic acid and the solvent mixture of white spirit and 2-ethylhexanol in the ratio of 1:1 [2].

The organic binder is a prototype contains components in the following ratio, wt.%:

Ethylcellulose 3,7-4,8

Dibutyl 7,5-14,0

A mixture of white spirit and ethyl 2-

hexanol in the ratio of 1:1 68,3 of 76.3

Vaseline oil 7,8-15,2

Stearic acid 0,6-1,8.

In modern high-performance machines, for example, the company "PALOMAR", the billet of the load capacitors in multiple cassettes in the number 1500-1900 pieces, and metallization ends is carried out in two steps: touch pasta, distributed on the surface, the first ends of the blanks, protruding from one side of the cassettes one side of the tape to the other, the ends of the blanks from the other side.

Paste prepared from a binder-prototype unsuitable for this equipment, since the mechanical strength of the resulting Nebozhenko coverage is low and does not allow you to push through the workpiece from one side of the tape to the other without damage, and to push the metallic workpiece from the cassette for further operation of firing without damage: chips and Siderov coverage.

In addition, the paste-based binder prototype has a higher evaporation rate in the case when the working surface, which are distributed pasta is h mm2the viscosity of the paste increases above the permissible limits.

Instability paste viscosity leads to a large variation in the thickness and uniformity of the applied coating, excessive paste and, ultimately, the paste thickens and becomes unsuitable for plating the ends of the blanks capacitors. Pasta starts to reach for the blanks, forming a "icicles", is not observed geometrical dimensions of the coating, which leads to a decrease of the yield of blanks capacitors on the operation of metallization.

The present invention aims at solving the problem of Eli, designed for mounting on a surface and coatings having high mechanical strength in newagenda condition that will allow the metallized ends of the ceramic multilayer chip capacitors in multi-tape machines, for example, the company "PALOMAR", pushing the workpiece capacitors in the process of applying a conductive coating to one side of the tape to the other without damage to the coating.

To achieve provide technical invention of the organic binder of metallization pastes for conductive coatings containing ethylcellulose, dibutyl phthalate, stearic acid, and the solvent additionally contains castor oil, rosin and gliftalevye resin and terpineol solvent, and the dibutyl phthalate and castor oil taken in the ratio of 1:1, with the following content, wt.%:

Ethylcellulose 2,9-3,1

A mixture of dibutyl phthalate and Castoro-

new oil in the ratio of 1:1 17,2-20,8

Gliftalevaja resin 10,2-14,0

Rosin is 1.5 to 10.7

Terpineol 47,7-67,9

Stearic acid 1.5 to 2.5

Comparative analysis of the proposed facility with the prototype shows that the composition of the binder on the operation of the solvent of terpineol, and also the above intervals of concentrations of the components.

Currently, we do not know the technical solution is identical to declare, which makes the proposed material meets the criterion of "Novelty."

The criterion of "Inventive step" is confirmed by the fact that only use the specified structure in the proposed spacing of the components ensures getting a new technical result is to increase the mechanical strength Nebozhenko coverage and reducing the rate of evaporation metallization pastes on the basis of the proposed binder while ensuring filling pastes metal powders to 74%.

Only in the presence of the binder composition of the above components in the proposed ratio leads to the formation of metallized contact surfaces when applying paste containing this binder, the hard skeleton of the molecules of the binder and metal particles, providing sufficient mechanical strength of the metallization layer that allows you to perform the manufacturing operations without damage and to increase the yield of blanks multilayer ceramic chip capacitors, prsee and pasta based on it provides contact coatings chip capacitors with high adhesion, uniform thickness, not dissolving in the solder POS-61 for 20-30 s temperature 2605aboutC.

This effect is observed only in the claimed range of concentrations of the components.

The optimality and feasibility of the proposed ratio of components is confirmed by the data table.1,2, act tests.

For experimental verification of the proposed composition were prepared 25 parties binder with different content of ethyl cellulose, a mixture of dibutyl phthalate and castor oil in a ratio of 1:1, gliftalevoj resin, rosin, stearic acid and terpineol, and were considered average, marginal and critical values of the proposed ratio of components (PP 1-25 table.1), the party of pasta based on the binder - prototype (p. 26 table.1), and two party binding with excess, and lack of dibutyl phthalate in a mixture of dibutyl phthalate and castor oil and the average values of the other components (PP 1-2 tab.2).

As initial components used the following raw materials:

Ethylcellulose N-100 TL6-55-52-91

Dibutyl GOST 8728-77

Castor oil GOST 6757-78

Gliftalevaja resin TL6-10-1266-77

Rosin GOST 19113-78

Stearic SIM way.

Pre ethylcellulose pour 2/3 of the volume of terpineol from that specified in the recipe, and leave for 24 hours to swell at room temperature. Then a solution of ethyl cellulose in terpineol directoraat on a sand bath at a temperature of 60-80aboutC.

Dissolving rosin produced in the remaining terpineol with stirring on a sand bath at a temperature of 60-80aboutC.

Then all the components are loaded into a container (for example, glass, enamel tank).

After which it was prepared, respectively 28 parties metallization paste using the following raw materials according to the following formulation, wt.%:

The fine powder

silver 59,0 TL6-09-3697-79

Mobile, Pallady-

the Wake of 15.2 TO-15-9-78

Glaze 5,9 sea.027.029 MK

Organic light-

based on 9,9

PES (over 100%) 0.1 GOST 13004-77

Acetone (over 100%) 7,0 GOST 2603-79

Metallization paste was prepared as follows.

Fine silver, palladium powder, glaze, organic binder, etc. are loaded into the porcelain drum with porcelain balls and mixed on a roller mill for 48-72 h

Then from each batch of pasta were made by experienced p is Birmingham:

- casting ceramic film on polyethilenphthalate (PET) substrate;

die - casting metal-containing paste on a PET substrate;

the Assembly of the package.

- manufacturing of workpieces;

- sintering the billet at a temperature 1200-1420about(The exact temperature chosen empirically for each batch of blanks);

- loading of the workpieces in the cassette on 1500-1900 pieces to cover the ends of metallization paste on the machine silvering firm PALOMAR;

- metallization pads blanks with one hand;

- drying of workpieces at a temperature of 200-240aboutWith the drying time is 10 minutes;

- reloading cartridges for metallization pads blanks with the other hand;

- drying of workpieces at a temperature of 200-240aboutWith the drying time is 10 minutes;

- unloading of workpieces from a cassette;

- burn metallization pastes at temperatures 800-820aboutWith over 40-65 C.

Appearance of the coating was measured under a binocular microscope MBS-9 with increasing 16xon a random sample from each batch of capacitors in a quantity of 50 pieces.

The coating thickness was determined on thin sections using a microscope MIM-8TH with increasing 280xand 700xwhat made 3 SHL is at the bursting machine RM-30 on a random sample in each batch of capacitors in quantity of 10 pieces.

The results of measurements and data on the quality of the coatings are given in table.1. 2 and is confirmed by the test report.

As follows from the data table.1. the yield and quality of metallization coating, capacitors, fabricated using paste on the basis of the proposed binder (PP 1-13 table. 1) superior capacitors fabricated using paste based on the binder-prototype (p. 26 table.1).

When the deviation of the percentage content of binder components outside the proposed relationship (PP 14-25 table.1 and PP 1-2 table.2), worse rheological, the technological characteristics of the paste, the coating quality and reduced yield.

This increases the ability to dissolve in the solder surface coating, which reduces the reliability of the capacitors during operation and ultimately eliminates the possibility of mounting these capacitors on the surface of the double-wave soldering.

Thus, an advantage of the present invention before a prototype is created on the basis of the proposed connecting metallization pastes with rheological properties, providing the stability of the paste over time, allowing you to fill the x chip capacitors for high-performance machines with getting metallization coating with high adhesion properties, resistant to dissolution in the solder POS-61.

ORGANIC BINDER METALLIZATION PASTES FOR CONDUCTIVE COATINGS containing ethylcellulose, dibutyl phthalate and terpineol, wherein the binder further comprises castor oil mixed with dibutyl phthalate, resins, glyptal resin and stearic acid, with dibutyl phthalate and castor oil taken in the ratio 1 : 1, with the following content, wt.%:

Ethylcellulose - 2,9 - 3,1

A mixture of dibutyl phthalate and castor oil in the ratio 1 : 1 - 17,2 - 20,8

Terpineol - 47,7 - 67,9

Rosin is 1.5 to 10.7

Gliftalevaja resin - 10,2 - 14,0

Stearic acid - 1,5 - 2,5

 

Same patents:

The invention relates to electrical engineering and can be used in the production of enamelled wires

Conductive paste // 2024081
The invention relates to microelectronics and can be used in the production of thick-film circuits

Conductive paste // 2020618
The invention relates to the technology of manufacturing thick-film structures and can be used in electronic engineering in the production of indicator devices, in particular vacuum fluorescent indicator (VLI)

The invention relates to electronic devices and can be used in the manufacture of multilayer ceramic capacitors

The invention relates to the production of non-combustible granular thermosetting based thermoset binder, inorganic fillers and special additives, intended for the manufacture of technical products with antistatic properties, which are used in fire - hazardous production facilities

Conductive paste // 2007765
The invention relates to electrical engineering, in particular to the compounds conductive metallization pastes, and can be used in a ceramic capacitor manufacturing for metallization ends unfired blanks capacitors monolithic type

The invention relates to electrical engineering, in particular to the compounds conductive metallization pastes, and can be used in a ceramic capacitor manufacturing for the metallization of the contact method unfired bismuth ceramics, mainly the ends of the blanks multilayer capacitors

FIELD: electrical engineering; physical action-to-electric signal converters: strain-gage components, pressure sensors, push-button switches for handling electric signals.

SUBSTANCE: proposed electrically active polymer whose electrical activity depends on impact of external physical fields has molecular fragments possessing high polarizability and/or bistable electron energy structure with respect to excess electron capture process; molecular fragments are linked together through respective intermediate elements of molecular chain. Novelty is that electrically active molecular fragments form single macromolecular structure chemically bonded through molecular chains. Proposed material built around mentioned polymer is produced in the form of films or fibers, or coatings, or bodies of revolution; at least one of geometrical dimensions dictating material form does not exceed double depth of surface charge penetration.

EFFECT: enhanced response of material electric conductivity to external factors within wide film-thickness range; high reproducibility of useful properties.

81 cl, 1 tbl, 1 ex

FIELD: electrical engineering; proton conductors, their production, and electrochemical devices using them.

SUBSTANCE: proposed proton (H+)conductor has carbonic material essentially composed of carbon and proton dissociation groups introduced therein. Protons are moving in this proton conductor between proton dissociation groups. Ion conductance of proton conductor is higher than its electron conductance. Carbonic materials used for the purpose are carbon clusters, such as fullerene or carbonic tubular material, or so-called carbonic nanotubes having diamond-shaped structure. This conductor can be used in the form of thin film within wide temperature range at any humidity.

EFFECT: reduced size and simplified design of electrochemical device.

56 cl, 30 dwg, 3 tbl, 12 ex

FIELD: production of electric conducting pulp for manufacture of paper, reinforcing polymer materials and packaging films.

SUBSTANCE: pulp contains fibrous particles including 65-95 mass-% of para-amide and 5-35 mass-% of sulfonated polyaniline containing sulfur in the amount of 8.5-15 mass-% which is dispersed over entire para-amide partially covering the particles externally. Specific area of surface of fibrous particles exceeds 7.5 m2/g. Pulp may be mixed with 95 mass-% of pulp of other material including poly-n-phenylene terephthlamide. Paper made from this pulp reduces rate of electric charge lesser than 150 ml.

EFFECT: enhanced efficiency.

6 cl, 4 tbl, 1 ex

FIELD: power engineering, possible use for construction of supporting structures of sub-stations, distributing devices and other electric plants, meant for receiving, transforming and distributing electric energy of three-phase electric current of industrial frequency 50 Hz in networks with voltages range 35, 110, 150, 220 kV.

SUBSTANCE: modular electric plant consists of electric equipment, receiving assembly and bearing structure, formed of at least one module mounted on foundation , consisting of at least two rows of bearing posts of tubular shape, with at least two of them in each row with forming of flights in longitudinal and transverse directions; bearing beams, supported by bearing posts in each flight of longitudinal direction and mounted in pairs. Modules are constructed so, that bearing beams of separate modules are mutually parallel and/or mutually perpendicular, and electric equipment is mounted on foundation. Receiving assembly consists of at least one current-conducting wire, connected to at least one support, mounted on bearing structure of modular electric plant, while support consists of two polymer isolators, connected along height with forming of rigidity point, and current conducting wire is connected to support by holding assembly. The best variants of inventions from the group are realized with bolt connection of bearing structure elements and polymer isolators.

EFFECT: higher operational reliability of electric plant structures in case of upholding of unification and standardization principles due to development of modules, rational occupation of area occupied by distributing device, possible further expansion of operating electric plants, decreased metal capacity of bearing structure, decreased net costs of mounting operations and operation of electric plant, higher operational reliability of receiving assembly of modular electric plant due to support being capable of receiving static and dynamic loads, increased reliability of receiving assembly of modular electric plant due to development of modules.

2 cl, 4 dwg

FIELD: electric engineering industry.

SUBSTANCE: invention proposes a suspension for preparing current-conducting coat that comprises sodium meta-silicate, graphite, aluminum oxide, ferric (III) oxide, strontium carbonate, potassium titanate, barium oxide and hydrochloric acid taken in the following ratio of components, wt.-%: sodium meta-silicate, 28-30; graphite, 11-15.5; aluminum oxide, 3.5-3.7; ferric (III) oxide, 3.5-3.7; strontium carbonate, 3.5-3.7; potassium titanate, 4.2-4.5; barium oxide, 1.2-1.5; hydrochloric acid, 4.9-5.1, and water, the balance. Invention provides the creature of current-conducting coat with positive temperature resistance coefficient for conferring high resistance to heat loadings to it. Invention can be used in producing film heating surfaces and electric heaters.

EFFECT: valuable properties of suspension.

1 tbl

FIELD: electric engineering industry.

SUBSTANCE: invention proposes a suspension for preparing current-conducting coat that comprises sodium meta-silicate, graphite, aluminum oxide, ferric (III) oxide, strontium carbonate, potassium titanate, barium oxide and hydrochloric acid taken in the following ratio of components, wt.-%: sodium meta-silicate, 28-30; graphite, 11-15.5; aluminum oxide, 3.5-3.7; ferric (III) oxide, 3.5-3.7; strontium carbonate, 3.5-3.7; potassium titanate, 4.2-4.5; barium oxide, 1.2-1.5; hydrochloric acid, 4.9-5.1, and water, the balance. Invention provides the creature of current-conducting coat with positive temperature resistance coefficient for conferring high resistance to heat loadings to it. Invention can be used in producing film heating surfaces and electric heaters.

EFFECT: valuable properties of suspension.

1 tbl

FIELD: electrical engineering.

SUBSTANCE: proposed high electron conduction compound is characterized in that it relates to ABCO(x - δ) type with potassium-nickel fluorite structure; x + y = 4, δ and ξ are ranging between -0.7 and +0.7. A has at least one metal chosen from group of Na, K, Rb, Ca, Ba, La, Pr, Sr, Ce, Nb, Pb, Nd, Sm, and Cd; B has at least one metal chosen from same group; C has at least one metal chosen from group of Cu, Mg, Ti, V, Cr, Mn, Fe, Co, Nb, Mo, W, and Zr, and/or metal chosen from group of Pt, Ru, Ir, Rh, Pd, and Ni. A and B are not identical, A and C are other than Nb at a time. Hal has at least one atom of halogen chosen from group of F, Cl, Br, and I. Proposed electrochemical cell electrode, method for manufacturing such electrode, and electrochemical cell produced using such electrode are also described in invention specification.

EFFECT: enhanced efficiency, cost, environmental and human health friendliness of proposed electrode.

15 cl, 1 dwg, 1 tbl, 5 ex

FIELD: polymer materials.

SUBSTANCE: invention relates to conducting polymer blend, which is prepared by selecting at least two mutually immiscible polymers and mixing them until into blend so that at least one of polymers forms continuous three-dimensional phase throughout the volume of blend. Thereafter, conducting metal-containing filler is added to blend. Difference in surface tensions between polymer(s) forming continuous three-dimensional phase and other polymers constituting polymer blend is equal at least 2 mN/m. Above-mentioned at least two polymers are selected from following polymer pairs: pair polyamide PA6 and polymer selected from group consisting of PA12 and polyolefin; pair PA66 and polymer selected from group consisting of PA6, polymethylmethacrylate, polycarbonate, polyethylene terephthalate, styrene/acrylonitrile copolymer, polystyrene, PA12, polyolefin, liquid-crystalline polymer, and polyoxymethylene; pair polybutylene terephthalate and polymer selected from group consisting of PA6, polymethylmethacrylate, polycarbonate, styrene/acrylonitrile copolymer, polyethylene terephthalate, polystyrene, PA12, polyolefin, liquid-crystalline polymer, and polyoxymethylene; pair polycarbonate and polymethylmethacrylate; pair polyethylene terephthalate and polymer selected from group consisting of polycarbonate, polymethylmethacrylate, polystyrene, PA6, PA12, and polyolefin; pair polymethylmethacrylate and polymer selected from group consisting of PA6, PA12, and polyolefin; pair polyoxymethylene and polymer selected from group consisting of polycarbonate, polymethylmethacrylate, polystyrene, PA6, PA12, and polyolefin; pair styrene/acrylonitrile copolymer and polymer selected from group consisting of polystyrene, PA6, PA12, and polyolefin.

EFFECT: enabled preparation of polymer blend with low content of conducting filler showing sufficient conductivity and good mechanical properties.

8 cl, 2 dwg, 4 tbl, 2 ex

FIELD: production of electricity conducting materials for various resistors and electric heating devices.

SUBSTANCE: newly introduced in composite electricity conducting material that has ferric oxide, orthophosphoric acid, and siliconized graphite is corundum of fine and coarse fractions with grain size of 0.16 - 32 mm, proportion of ingredients being as follows, mass percent: ferric oxide, 15 - 20; siliconized graphite, 10 - 30; orthophosphoric acid, 10 - 15; corundum, 40 - 60. Prepared compound is subjected to semidry molding and heat treatment at temperature gradually increased to 350 °C followed by seasoning.

EFFECT: enhanced mechanical strength and heat conductivity affording long life for products made of this material.

1 cl, 2 tbl

FIELD: electrical products industry; compositions for manufacture of the anode grounding electrodes.

SUBSTANCE: the invention is pertaining to the field of electrical products industry, in particular, to compositions for manufacture of the anode grounding electrodes applied for protection of the underground structures and pipelines against electrochemical corrosion. The technical result of the invention is the increased strength the anode grounding electrodes and the improved special electrical conductivity of the anode grounding electrode. For solution of the pointed problem the offered composition used for manufacture of the grounding electrodes contains the petroleum calcined coke breeze, the ammonium chloride as the hardening agent, and the binding agent - the sulfite-spirit distillery dregs at the following components ratio (in mass %): the petroleum calcined coke breeze - 76-80, the sulfite-spirit distillery dregs, the ammonium chloride 2-4, the sulfite-spirit distillery dregs - the rest.

EFFECT: the invention ensures the increased strength the anode grounding electrodes and the improved special electrical conductivity of the anode grounding electrode.

1 tbl, 1 ex

FIELD: electronic engineering; gas panel manufacture.

SUBSTANCE: protective coating that can be used for manufacturing contact members of gas-panel strip conductors is formed on both sides of polyamide and applied by stenciling method using for the purpose dielectric composition resistant to 20-30% alkali solutions at temperature of 65 - 85oC that incorporates in its composition ethyl cellulose in the amount of maximum 9 parts by weight and organic solvent in the amount of minimum 91 parts by weight with boiling temperature of ≥ 190oC, minimal amount of ethyl cellulose and maximal amount of organic solvent being, respectively, 7.5 and 92.5 parts by weight.

EFFECT: improved rheological and protective properties of coating using proposed composition.

1 cl, 1 ex

FIELD: marking materials.

SUBSTANCE: invention relates to pigmentation and compositions for use in laser marking, in particular UV absorbing pigment at least partly covered with synergist having general formula [Rm(SiOn)]pR'q wherein m=1-3, n=1-3, p is a number equal to at least 1, q=0-3, and at least one of R or R' represents substituent. When pyrolized, pigment forms black material appropriate to form label. Such pigments are suitable for fluoropolymers serving to insulate wire conductors and cables.

EFFECT: expanded marking possibilities.

20 cl, 6 tbl, 38 ex

Insulating material // 2284593

FIELD: electrical engineering.

SUBSTANCE: proposed insulating material that can be effectively used to insulate conductors for various industries, including radio engineering, cable industry, microelectronics, and the like, has multilayer structure of N thin-film layers, where N > 1; all layers are made of separate piled films produced from same material and by same method, having actually equal thickness d < 25 μm.

EFFECT: facilitated manufacture, reduced cost of materials used, enhanced electric and mechanical strength.

1 cl, 1 dwg, 2 tbl

Up!