CN104392765A - Silicon-nitride-contained oxidation-resistant conductive silver paste and manufacturing method thereof - Google Patents

Abstract

The invention discloses a silicon-nitride-contained oxidation-resistant conductive silver paste. The conductive silver paste is characterized in that the paste comprises, by weight, 40 to 50 parts of silver powders, 1.2 to 3.5 parts of lithium manganese phosphate, 0.4 to 0.7 parts of chitin, 1.3 to 2.6 parts of chitosan oligosaccharide, 3 to 5 parts of lithium silicate, 1.3 to 2.4 parts of silicon carbide, 0.5 to 0.8 parts of silicon nitride, 3 to 5 parts of distearyl thiodipropionate, and 30 to 40 parts of auxiliary agents. According to the invention, the silicon nitride is added and thus the conductive silver paste has the oxidation-resistant function. Therefore, the prepared conductive silver paste has advantages of excellent electrical conductivity, low resistance, low operating temperature, and high thermal conductivity.

Description

Anti-oxidant conductive silver paste of a kind of silicon nitride and preparation method thereof

 

Technical field

The present invention relates to conductive silver paste field, be specifically related to anti-oxidant conductive silver paste of a kind of silicon nitride and preparation method thereof.

Background technology

Conductive silver paste refers to and is printed on conduction stock, make it the silver slurry that there is conduction current and get rid of accumulate static charge ability, be generally be imprinted on the non-conductive stocks such as plastics, glass, pottery or cardboard, it is made up of electroconductive stuffing, binder, solvent and additive.Conductive silver paste needs the characteristic possessed to have: conductivity (antistatic behaviour) is good, strong adhesion, printing adaptability are good and solvent resistance superior properties, and existing conductive silver paste has a lot of shortcoming in the market, not only containing lead, cadmium etc. and poisonous, contaminated environment, and when being used on conduction stock, adhesive force is low, soldering resistance is not good, sintering character is poor.

Summary of the invention

Object of the present invention is just to provide anti-oxidant conductive silver paste of a kind of silicon nitride and preparation method thereof, to overcome the deficiencies in the prior art.

The object of the present invention is achieved like this:

The anti-oxidant conductive silver paste of a kind of silicon nitride, it is characterized in that, be made up of the raw material of following weight portion: silver powder 40-50, lithium manganese phosphate 1.2-3.5, chitin 0.4-0.7, chitosan oligosaccharide 1.3-2.6, lithium metasilicate 3-5, carborundum 1.3-2.4, silicon nitride 0.5-0.8, thio-2 acid two octadecyl 3-5, auxiliary agent 30-40.

Described auxiliary agent is made up of following raw materials in part by weight: zirconium dioxide 0.3-0.5, nickel oxide 1-3, white carbon 1-3, polymethacrylates 0.3-0.6, Tissuemat E 0.4-0.8, DGDE acetate 5-8, polysiloxanes 0.2-0.3, polyethylene glycol 9-13, its preparation method is that zirconium dioxide, nickel oxide are put into calciner and calcine 1-2 hour at 540-650 DEG C, taking-up is cooled to room temperature, adds white carbon grinding 20-40 minute; DGDE acetate, polyethylene glycol are stirred and evenly mixed, at 150-185 DEG C, reacts 2-3 hour, be cooled to 75-85 DEG C, add polymethacrylates, Tissuemat E, polysiloxanes, keep temperature to stir 3-4 hour; By above each product mixing, grind 2-4 hour obtained 300-400 order slurry and get final product.

The preparation method of the described anti-oxidant conductive silver paste of a kind of silicon nitride, is characterized in that comprising the following steps:

(1) get carborundum 3-4, silicon nitride puts into calciner and sinter 2-3 hour at 680-740 DEG C, take out cooling, add lithium metasilicate and grind 1-2 hour together;

(2) get the two octadecyl of thio-2 acid and be heated to 55-65 DEG C, add chitin, chitosan oligosaccharide stirring puts into lithium manganese phosphate grinding 2-3 hour pulping to mixing in 30-40 minute;

(3) step (1), (2) reaction mass and other leftover materials are mixed, be warming up to 100-120 DEG C, stirring reaction 1-2 hour, cooling, grinding to form particle diameter is 10-20 μm of slurry grain, to obtain final product.

The present invention has following beneficial effect: the present invention adds silicon nitride and has anti-oxidation function, and obtained conductive silver paste has that conductivity is good, resistance is little, and has very low operating temperature and its thermal conductivity is very high.

Embodiment

The described anti-oxidant conductive silver paste of a kind of silicon nitride, it is characterized in that, be made up of the raw material of following weight portion: silver powder 43, lithium manganese phosphate 1.5, chitin 0.47, chitosan oligosaccharide 1.6, lithium metasilicate 3, carborundum 1.3, silicon nitride 0.5, thio-2 acid two octadecyl 3, auxiliary agent 32.

Described auxiliary agent is made up of following raw materials in part by weight: zirconium dioxide 0.4, nickel oxide 1, white carbon 2, polymethacrylates 0.5, Tissuemat E 0.7, DGDE acetate 8, polysiloxanes 0.2, polyethylene glycol 13, its preparation method is that zirconium dioxide, nickel oxide are put into calciner and calcine 1-2 hour at 540-650 DEG C, taking-up is cooled to room temperature, adds white carbon grinding 20-40 minute; DGDE acetate, polyethylene glycol are stirred and evenly mixed, at 150-185 DEG C, reacts 2-3 hour, be cooled to 75-85 DEG C, add polymethacrylates, Tissuemat E, polysiloxanes, keep temperature to stir 3-4 hour; By above each product mixing, grind 2-4 hour obtained 300-400 order slurry and get final product.

Manufacture method comprises the following steps:

(1) get carborundum 3-4, silicon nitride puts into calciner and sinter 2-3 hour at 680-740 DEG C, take out cooling, add lithium metasilicate and grind 1-2 hour together;

(2) get the two octadecyl of thio-2 acid and be heated to 55-65 DEG C, add chitin, chitosan oligosaccharide stirring puts into lithium manganese phosphate grinding 2-3 hour pulping to mixing in 30-40 minute;

(3) step (1), (2) reaction mass and other leftover materials are mixed, be warming up to 100-120 DEG C, stirring reaction 1-2 hour, cooling, grinding to form particle diameter is 10-20 μm of slurry grain, to obtain final product.

The technical indicator of being processed the conductive silver paste obtained by above-described embodiment is as follows:

(1) viscosity: 50-100PaS(Brookfield, 10RPM);

(2) adhesive force: > 10N/mm ²;

(3) sheet resistance: < 5m Ω/c;

(4) plumbous cadmium content: < 100ppm.

Claims (2)

1. the anti-oxidant conductive silver paste of silicon nitride, it is characterized in that, be made up of the raw material of following weight portion: silver powder 40-50, lithium manganese phosphate 1.2-3.5, chitin 0.4-0.7, chitosan oligosaccharide 1.3-2.6, lithium metasilicate 3-5, carborundum 1.3-2.4, silicon nitride 0.5-0.8, thio-2 acid two octadecyl 3-5, auxiliary agent 30-40; Described auxiliary agent is made up of following raw materials in part by weight: zirconium dioxide 0.3-0.5, nickel oxide 1-3, white carbon 1-3, polymethacrylates 0.3-0.6, Tissuemat E 0.4-0.8, DGDE acetate 5-8, polysiloxanes 0.2-0.3, polyethylene glycol 9-13, its preparation method is that zirconium dioxide, nickel oxide are put into calciner and calcine 1-2 hour at 540-650 DEG C, taking-up is cooled to room temperature, adds white carbon grinding 20-40 minute; DGDE acetate, polyethylene glycol are stirred and evenly mixed, at 150-185 DEG C, reacts 2-3 hour, be cooled to 75-85 DEG C, add polymethacrylates, Tissuemat E, polysiloxanes, keep temperature to stir 3-4 hour; By above each product mixing, grind 2-4 hour obtained 300-400 order slurry and get final product.

2. the manufacture method of the anti-oxidant conductive silver paste of a kind of silicon nitride according to claim 1, is characterized in that comprising the following steps:

(1) get carborundum 3-4, silicon nitride puts into calciner and sinter 2-3 hour at 680-740 DEG C, take out cooling, add lithium metasilicate and grind 1-2 hour together;

(2) get the two octadecyl of thio-2 acid and be heated to 55-65 DEG C, add chitin, chitosan oligosaccharide stirring puts into lithium manganese phosphate grinding 2-3 hour pulping to mixing in 30-40 minute;

(3) step (1), (2) reaction mass and other leftover materials are mixed, be warming up to 100-120 DEG C, stirring reaction 1-2 hour, cooling, grinding to form particle diameter is 10-20 μm of slurry grain, to obtain final product.