CN104575678A - Electric conduction silver paste for electrothermal element of electrothermal film quartz glass tube - Google Patents

Abstract

The invention discloses an electric conduction silver paste for an electrothermal element of an electrothermal film quartz glass tube. The silver paste consists of the following raw materials in parts by weight: 84-90 parts of cladding silver powder, 10-13 parts of lead-free glass powder, 0.4-1 part of lecithin, 6-8 parts of ethyl cellulose, 4-6 parts of methyl cellulose, 16-20 parts of 2(2-Ethoxyethoxy)ethanol, 2-3 parts of cyclohexanone, 1-2 parts of turpentine, 0.3-1 part of magnesium aluminum silicate, 0.1-0.2 part of cerium oxide, 1-2 parts of polyamide wax micro powder, 2-3 parts of dioctyl sebacate, 1-2 parts of allyl polyethylene glycol, and 0.1-0.3 part of alpha-bromo cinnamic aldehyde. The cladding silver powder is obtained by enabling nanometer silver powder to be uniformly and compactly clad to the surfaces of macromolecular microspheres, so that not only can the consumption of noble metal silver powder be reduced and the production cost be reduced, but also the dispersibility and the stability of the nanometer silver powder are greatly improved.

Description

A kind of electric membrane quartz glass tube electrothermal piece conductive silver paste

Technical field

The present invention relates generally to conductive silver paste field, particularly relates to a kind of electric membrane quartz glass tube electrothermal piece conductive silver paste.

Background technology

Conductive silver slurry refers to and is printed on conduction stock, and making it the silver slurry having conduction current and get rid of accumulate static charge ability, is generally be imprinted on the non-conductive stocks such as plastics, glass, pottery or cardboard.Printing process is very wide, as silk screen printing, letterpress, flexographic printing, intaglio printing and offset printing etc. all can adopt.Then resistance, Solder resistance and rub resistance etc. are also different can to select different printing processes, thickness difference according to the requirement of thickness.This silver slurry has thick film mill base and resin type two kinds.The former is that the high temperature of binder burns till type with frit, the latter take synthetic resin as the low temperature drying of binder or the silk screen silver slurry of radiation-curable, and in conductive filler conductivity it is preferred that silver powder and copper powder, but cost is relatively high, therefore find through experiment, adopt silver-colored coated particle just can to effectively reduce cost as conductive filler, and its its conductivity is had no significant effect.

Summary of the invention

The object of the invention is just to provide a kind of electric membrane quartz glass tube electrothermal piece conductive silver paste.

The present invention is achieved by the following technical solutions:

A kind of electric membrane quartz glass tube electrothermal piece conductive silver paste, is characterized in that what it was made up of the raw material of following weight parts:

Coated silver powder 84-90, lead-free glass powder 10-13, lecithin 0.4-1, ethyl cellulose 6-8, methylcellulose 4-6, diethylene glycol ether 16-20, cyclohexanone 2-3, turpentine oil 1-2, Magnesiumaluminumsilicate 0.3-1, cerium oxide 0.1-0.2, polyamide wax micropowder 1-2, di-n-octyl sebacate 2-3, allyl polyglycol 1-2, alpha-bromo-cinnamaldehyde 0.1-0.3;

Described coated silver powder is made up of the raw material of following weight parts:

Nano-sized iron oxide 4-6, lanthanum sulfate 0.1-0.2, deionized water 300-400, butyl acrylate 10-13, sodium carboxymethylcellulose 0.9-2, silane coupler KH560 0.06-0.1, benzoyl peroxide 0.01-0.02, ascorbic acid 45-60, locust bean gum 1-2, sodium tetraborate 0.1-0.14, silver nitrate 100-110;

By nano-sized iron oxide, butyl acrylate mixing, add 31-35%, the sodium carboxymethylcellulose of above-mentioned deionized water weight, benzoyl peroxide is added after stirring, reaction 6-10 hour is left standstill at 70-90 DEG C, add lanthanum sulfate, silane coupler KH560, magnetic agitation 10-15 minute, obtains nanoemulsions;

By locust bean gum, sodium tetraborate mixing, add the 20-30% of residue deionized water weight, drip ammoniacal liquor, adjustment PH is 6.8-7, adds ascorbic acid, stirs, obtain reducing solution;

The mixing of each raw material will be remained, stir, obtain oxidation solution;

Above-mentioned oxidation solution is added drop-wise in reducing solution, nanoemulsions is added after dropwising, rotating speed be 1200-1500rmp, temperature be 20-25 DEG C at dispersed with stirring 25-30 minute, after sedimentation 1-2 hour, supernatant is gone to get its sediment, wash 3-5 time with deionized water and ethanol, dry, abrasive dust.

The preparation method of described electric membrane quartz glass tube electrothermal piece conductive silver paste, is characterized in that comprising the following steps:

(1) by diethylene glycol ether, cyclohexanone, turpentine oil mixing, lecithin, ethyl cellulose, methylcellulose, di-n-octyl sebacate is added after stirring, be heated to 76-80 DEG C and constant temperature, until resin constant temperature is dissolved to 20000-30000cps, again by resin filtering and impurity removing on 300-400 object screen cloth, obtain organic carrier;

(2) by polyamide wax micropowder, Magnesiumaluminumsilicate mixing, at 70-80 DEG C, be uniformly mixed 5-10 minute, add allyl polyglycol, 50-70 rev/min of dispersed with stirring 2-3 minute, obtains dispersing aid;

(3) join in organic carrier by coated silver powder, mix, add dispersing aid and each raw material of residue, high speed dispersion, send on three-roll grinder and mix, ground slurry granularity, to 8-15 micron, gets product.

Advantage of the present invention is:

The nano-silver powder that coated silver powder of the present invention is evenly and is densely coated on the surface of polymer microsphere, not only can reduce the consumption of noble metal silver powder, reduce production cost, also substantially increase dispersiveness and the stability of nano-silver powder simultaneously, adopt the mixing of locust bean gum, sodium tetraborate as dispersant, viscosity is low, is convenient to washing and filtering, good dispersion, not easily forms reunion;

The adhesive force of conductive silver paste silver layer of the present invention is good, improves the success rate of wire bonds, and lead-in wire is without coming off, and the cerium oxide added can improve itself and the congruent melting of tin indium oxide film high-temp., makes silver film adhesive force good, difficult drop-off.

Embodiment

Embodiment 1

A kind of electric membrane quartz glass tube electrothermal piece conductive silver paste, is characterized in that what it was made up of the raw material of following weight parts:

Coated silver powder 90, lead-free glass powder 13, lecithin 0.4, ethyl cellulose 6, methylcellulose 6, diethylene glycol ether 20, cyclohexanone 2, turpentine oil 1, Magnesiumaluminumsilicate 0.3, cerium oxide 0.2, polyamide wax micropowder 1, di-n-octyl sebacate 2, allyl polyglycol 1, alpha-bromo-cinnamaldehyde 0.1;

Described coated silver powder is made up of the raw material of following weight parts:

Nano-sized iron oxide 4, lanthanum sulfate 0.1, deionized water 300, butyl acrylate 10, sodium carboxymethylcellulose 0.9, silane coupler KH560 0.06, benzoyl peroxide 0.01, ascorbic acid 45, locust bean gum 1, sodium tetraborate 0.1, silver nitrate 100;

By nano-sized iron oxide, butyl acrylate mixing, add 31% of above-mentioned deionized water weight, sodium carboxymethylcellulose, after stirring, add benzoyl peroxide, reaction 6 hours are left standstill at 70 DEG C, add lanthanum sulfate, silane coupler KH560, magnetic agitation 10 minutes, obtains nanoemulsions;

By locust bean gum, sodium tetraborate mixing, add 20% of residue deionized water weight, drip ammoniacal liquor, regulate PH to be 6.8, add ascorbic acid, stir, obtain reducing solution;

The mixing of each raw material will be remained, stir, obtain oxidation solution;

Above-mentioned oxidation solution is added drop-wise in reducing solution, add nanoemulsions after dropwising, rotating speed be 1200rmp, temperature be 20 DEG C at dispersed with stirring 25 minutes, supernatant goes after 1 hour to get its sediment by sedimentation, 3 times are washed, dry, abrasive dust with deionized water and ethanol.

The preparation method of described electric membrane quartz glass tube electrothermal piece conductive silver paste, comprises the following steps:

(1) by diethylene glycol ether, cyclohexanone, turpentine oil mixing, lecithin, ethyl cellulose, methylcellulose, di-n-octyl sebacate is added after stirring, be heated to 80 DEG C and constant temperature, until resin constant temperature is dissolved to 20000cps, again by resin filtering and impurity removing on 400 object screen cloths, obtain organic carrier;

(2) by polyamide wax micropowder, Magnesiumaluminumsilicate mixing, at 70 DEG C, be uniformly mixed 5 minutes, add allyl polyglycol, 50 revs/min of dispersed with stirring 2 minutes, obtain dispersing aid;

(3) join in organic carrier by coated silver powder, mix, add dispersing aid and each raw material of residue, high speed dispersion, send on three-roll grinder and mix, ground slurry granularity to 8 micron, gets product.

Performance test:

Without lump, in uniform state after stirring;

Fineness≤15 μm;

Adhesive force 4.7B;

Hardness 1H.

Claims (2)

1. an electric membrane quartz glass tube electrothermal piece conductive silver paste, is characterized in that what it was made up of the raw material of following weight parts:

Coated silver powder 84-90, lead-free glass powder 10-13, lecithin 0.4-1, ethyl cellulose 6-8, methylcellulose 4-6, diethylene glycol ether 16-20, cyclohexanone 2-3, turpentine oil 1-2, Magnesiumaluminumsilicate 0.3-1, cerium oxide 0.1-0.2, polyamide wax micropowder 1-2, di-n-octyl sebacate 2-3, allyl polyglycol 1-2, alpha-bromo-cinnamaldehyde 0.1-0.3;

Described coated silver powder is made up of the raw material of following weight parts:

Nano-sized iron oxide 4-6, lanthanum sulfate 0.1-0.2, deionized water 300-400, butyl acrylate 10-13, sodium carboxymethylcellulose 0.9-2, silane coupler KH560 0.06-0.1, benzoyl peroxide 0.01-0.02, ascorbic acid 45-60, locust bean gum 1-2, sodium tetraborate 0.1-0.14, silver nitrate 100-110;

By nano-sized iron oxide, butyl acrylate mixing, add 31-35%, the sodium carboxymethylcellulose of above-mentioned deionized water weight, benzoyl peroxide is added after stirring, reaction 6-10 hour is left standstill at 70-90 DEG C, add lanthanum sulfate, silane coupler KH560, magnetic agitation 10-15 minute, obtains nanoemulsions;

By locust bean gum, sodium tetraborate mixing, add the 20-30% of residue deionized water weight, drip ammoniacal liquor, adjustment PH is 6.8-7, adds ascorbic acid, stirs, obtain reducing solution;

The mixing of each raw material will be remained, stir, obtain oxidation solution;

Above-mentioned oxidation solution is added drop-wise in reducing solution, nanoemulsions is added after dropwising, rotating speed be 1200-1500rmp, temperature be 20-25 DEG C at dispersed with stirring 25-30 minute, after sedimentation 1-2 hour, supernatant is gone to get its sediment, wash 3-5 time with deionized water and ethanol, dry, abrasive dust.

2. a preparation method for electric membrane quartz glass tube electrothermal piece conductive silver paste as claimed in claim 1, is characterized in that comprising the following steps:

(1) by diethylene glycol ether, cyclohexanone, turpentine oil mixing, lecithin, ethyl cellulose, methylcellulose, di-n-octyl sebacate is added after stirring, be heated to 76-80 DEG C and constant temperature, until resin constant temperature is dissolved to 20000-30000cps, again by resin filtering and impurity removing on 300-400 object screen cloth, obtain organic carrier;

(2) by polyamide wax micropowder, Magnesiumaluminumsilicate mixing, at 70-80 DEG C, be uniformly mixed 5-10 minute, add allyl polyglycol, 50-70 rev/min of dispersed with stirring 2-3 minute, obtains dispersing aid;

(3) join in organic carrier by coated silver powder, mix, add dispersing aid and each raw material of residue, high speed dispersion, send on three-roll grinder and mix, ground slurry granularity, to 8-15 micron, gets product.