CN1045786C - Aquadag outer conductive coating for colour kinescope and its preparation method - Google Patents

Abstract

The present invention belongs to conductive paint outside the aquadag of color picture tubes. The present invention is characterized in that the conductive paint is prepared from 25 to 30 wt% of graphite, 15 to 25 wt% of low-temperature film forming agent, 0.6 to 1.2 wt% of dispersing agent, 0.1 to 0.5 wt% of surface active agent, 0.1 to 4 wt% of oil-proof dirt resistant agent, 1 to 10 wt% of film coating auxiliary agent and 30 to 58 wt% of purified water. The present invention has the advantages of low resistance, uniform dispersion, no foaming during coating, smooth surface, oil resistance, dirt prevention, low temperature resistance, firm adhesiveness, stable chemical property and good operating performance.

Description

Colour picture tube aquadag outer conductive paint and preparation technology

The invention belongs to colour picture tube outer conductive paint and preparation technology thereof.

Referring to Fig. 1, this is the sectional view of picture tube.1-color picture tube glass bulb wherein; The 2-display screen; 3-cone central part; The 4-neck; 5-selects electroplax; 6-pin position; The 7-electron beam gun; 8,9,10-electron beam; The 11-deflector coil; 12-phosphor body shadow mask; 13-inner conductive film layer; The outer conductive film layer of 14-.The colour picture tube outer conductive paint that uses exists following defective at present: 1, the coarse size of graphite raw material, irrational distribution, size range roughly accounts for 24 ± 3% at≤2 μ m particles, and 2-4 μ m particle 24 ± 3%, 4-6 μ m account for 28 ± 3%, and 6 μ m account for 24 ± 3%.The coarse particle proportion is big, causes the levelling property of filming poor, and particle is heaped inhomogeneous, and surface irregularity is not bright and clean; 2, coating back resistance height, bubble, this is because only prepare with dry powder graphite aborning, graphite particle is exposed in the air, the a large amount of gases of suction and other impurity, dispersion agent and tensio-active agent are difficult to be attached on the particle, cause goods suspending stabilized poor, defectives such as precipitation is serious, and resistance is higher; 3, bad dispersibility, place easily cohesion of back, precipitation, former dispersion agent adopts homemade carboxymethyl cellulose, and substitution value is at 0.8-1.0, substitution value is low, solvency power is poor, be particulate state and exist, tensio-active agent adopts sodium methylene bis-naphthalene sulfonate, and active function is little, thereby the product coating is coarse, the diffusion flow adjustment, suspending stabilized bad, very easily precipitation is the state that hardens; 4, the temperature tolerance of filming is poor, and low temperature easily comes off, and membrane-forming agent adopts polyvinyl chloride emulsion, and film formation at low temp is poor, and easily embrittlement comes off, and is moisture resistance poor; 5, oil resistant is poor, runs into oil stain, and it is damaged to form " flake " shape.

The objective of the invention is provides a kind of colour picture tube aquadag outer conductive paint and manufacturing process in order to solve the problem of above-mentioned existence.It is low that it has resistance, is uniformly dispersed, apply non-foaming, any surface finish, oil resistant is antifouling, and is low temperature resistant, in firm tack, stable chemical, good operation.

In order to achieve the above object, the invention is characterized in proportioning following (weight percent) graphite 25-30%, film formation at low temp agent 15-25%, dispersion agent 0.6-1.2%, tensio-active agent 0.1-0.5%, grease proofing stain resistant agents 0.1-4%, the auxiliary 1-10% that films, pure water 30-58%.

Dispersion agent is a methylcellulose gum, and Natvosol, cellulose acetate, above-mentioned substance substitution value α be at 1.4-1.6, alkyl biphenyl ether sulfonic acid sodium, fatty alcohol-polyoxyethylene ether or cellulose sulfate ester sodium salt.

Tensio-active agent has adopted sodium butylnaphthalenesulfonate, succinate sodium sulfonate, W-28 or LT-146; LT-146 wherein, W-28 belong to acrylic copolymer anionoid type tensio-active agent, available from Japanese サ ニ つ つ つ Co., Ltd..LT-146 and W-28 are its model and specification.

Styrene-acrylic resin, poly-third resin or polyvinyl alcohol (PVA) are adopted in the film formation at low temp agent.

Grease proofing stain resistant agents is ethanol, polyvinylpyrrolidone or mandelic resin.

The auxiliary of filming is colloid silicon, potassium silicate, water glass, lithium silicate or Calucium Silicate powder.

The manufacturing process of making colour picture tube aquadag outer conductive paint is as follows:

A, carry out the powerful surface treatment of graphite earlier: (1) took by weighing the weight percent of graphite by 20-30%, adds the dispersion agent of 0.1-1.0, is that carrier adds to absolutely then with the pure water, with roller ball grinding machine or vibration mill ball milling 1-3 hour;

(2) the graphite slurries after will handling dewater with pressure filter, promptly as the graphite raw material of producing colour picture tube aquadag outer conductive paint;

B, manufacturing process (following component and proportioning are made by the component and the proportioning of power 1)

(1) pure water is invested in the high-speed stirring groove, adds dispersion agent, stirring and dissolving;

(2) with the graphite raw material of filter-press dehydration, be invested in the steel basin, high-speed stirring it;

(3) tensio-active agent and film formation at low temp agent are thrown in, and added the auxiliary of filming simultaneously;

(4) homogeneous slurry in the steel basin is pumped in the tumbling mill rolling ball milling 3-6 hour;

(5) slush pump in the tumbling mill is depressed in the middling speed steel basin, adds grease proofing stain resistant agents, stir, detect qualified after, filter with 100 eye mesh screens, at last packing.

The graphite particle size scope can be at particle diameter≤2 μ m 45-50%, 2-4 μ m35-45%, and all the other are 4-5 μ m.

Select with regard to component of the present invention below, explanation is gone in proportioning and effect thereof: 1, the present invention has adjusted graphite raw material proportioning and size-grade distribution, thereby has changed the particle structure ratio, and size-grade distribution accounts for 45-50% for≤2 μ m, 2-4 μ m accounts for 35-45%, and all the other are 4-5 μ m.Because particle is thin, rational size distribution, thereby levelling property is good automatically, it is evenly bright and clean to film, immaculate.

2, the present invention adopts good dispersion agent, dissolves well in water, and solution is the vitreosol shape, no particle residue, and dispersion force is extremely strong, and product does not precipitate.

3, adopt optimum surfactant, the powerful surface that reduces is powerful, increases surfactivity, promotes to strengthen all even permeate stream levelling.

4, the present invention adopts ideal oil resistant stain control agent, eliminates " flake " phenomenon that colored picture tube outer wall greasy dirt causes, make film complete bright and clean.Adopting grease proofing stain resistant agents is one of important feature of the present invention.

5, the present invention adopts the film formation at low temp agent, and film forming is good, moisture-proof, low temperature resistant, do not come off.

6, the present invention doses to film to assist and adds agent, and this material granule ultra micro can be filled in uniformly in the space of filming and go, and making the row of filming fine and close, more complete, and is stronger to glass attachment power.Prior art lacks this material, is porous state owing to film, though grid is tiny, water and other impurity are easy to be penetrated in the hole and go, and influences film fastness and humidity resistance.Adding with the auxiliary of filming is one of key character of the present invention.

7, the present invention adopts the powerful process of surface treatment of graphite, handles graphite, removes surface contamination, and dispersion agent and tensio-active agent can be adhered on the newborn activated face of graphite particle securely, has improved suspension stability and graphitic conductive greatly.Product resistance of the present invention drops to 0.02-0.05 Ω cm from existing procucts resistance 0.20-0.25 Ω cm, and product is reliable and stable, places and never degenerates in 6 months, does not precipitate.

The present invention has excellent tack, has disapproved any peeling off and has come off, and moisture resistivity is good, is placed on to boil 20 minutes in the boiling water, and without any peeling off the foaming phenomenon, behind the airing, sticking power is not affected, and the rate of peeling off is zero.The water-soluble outside electric conduction graphite latices of domestic like product A0-80, wet fastness can only reach 95% do not peel off.The like product G-80 of powder Co., Ltd. of Hitachi of Japan, tack reaches 80% not to be peeled off, and wet fastness reaches 5/6 not to be peeled off, the like product L-25 of blacklead Co., Ltd. of Japan, tack allows 30% to peel off with interior, and wet fastness % allows 30% to peel off with interior.

Resistance of the present invention is low, and resistivity is controlled at 0.02-0.10 Ω cm scope, and domestic like product A0-80 resistivity is in 0.20-0.25 Ω cm scope, the like product G-80 of FDAC powder Co., Ltd., and resistivity is also in 0.20-0.25 Ω cm scope.

The present invention carries out powerful surface with raw material graphite and gives processing, and domestic like product A0-80, Japanese like product G-80 etc. all makes raw material with Graphite Powder 99, and directly batching, thereby resistance height, precipitation are soon.

The present invention adopts the powerful ball milling dispersing technology of secondary, and the finished product stably dispersing place and do not condense half a year, and domestic like product A0-80 and Japanese like product G-80 all is disposable dispersed with stirring that dispersion efficiency is poor, instability.

Fig. 1 is the sectional view of teletron.

Embodiment 1, (weight percent) graphite 28%, and poly-third resin 18%, Natvosol 1% (substitution value 1.4-1.6), W-28 0.4%, mandelic resin 3%, colloid silicon 5%, pure water 44.6%.

Embodiment 2, (weight percent) graphite 25%, and styrene-acrylic resin 20%, methylcellulose gum: 0.8% (substitution value 1.4-1.6), LT-146 0.2%, mandelic resin 4%, potassium silicate 4%, pure water 46%.

Embodiment 3, (weight percent) graphite 30%, styrene-acrylic resin cellulose acetate 1.2% (substitution value 1.4-1.6), sodium butylnaphthalenesulfonate 0.5%, polyvinyl chloride emulsion 4%, lithium silicate 8%, pure water 41.3%.

Embodiment 4, (weight percent) graphite 26%, poly-third resin 25%, alkyl biphenyl ether sulfonic acid sodium 0.6%, succinate sodium sulfonate 0.1%, ethanol 0.1%, water glass 8%, pure water 40.2%.

Example 5, (weight percent) graphite 25%, poly-third resin 20%, cellulose sulfate fat sodium salt 1.1%, LT-146 0.3% polyvinylpyrrolidone 2%, colloid silicon 6%, pure water 48.6%.

The foregoing description, the graphite particle diameter at≤2 μ m45-50%, 2-4 μ m35-45%, all the other are for choosing in the 4-5 mu m range.

The foregoing description, take following processing step:

A, carry out the powerful surface treatment of graphite earlier: (1) took by weighing the weight percent of graphite by 20-30%, adds the dispersion agent of 0.1-1.0, is that carrier adds to absolutely then with the pure water, with roller ball grinding machine or vibration mill ball milling 1-3 hour;

(2) the graphite slurries after will handling dewater with pressure filter, promptly as the graphite raw material of producing colour picture tube aquadag outer conductive paint;

B, manufacturing process (following component and proportioning are pressed the component and the proportioning of the foregoing description and made)

(1) pure water is invested in the high-speed stirring groove; Add dispersion agent, stirring and dissolving;

(2) with the graphite raw material of filter-press dehydration, be invested in the steel basin, high-speed stirring it;

(3) tensio-active agent and film formation at low temp agent are thrown in, and added the auxiliary of filming simultaneously;

(4) homogeneous slurry in the steel basin is pumped in the tumbling mill rolling ball milling 3-6 hour;

(5) slush pump in the tumbling mill is depressed in the middling speed steel basin, adds grease proofing stain resistant agents, stir, detect qualified after, filter with 100 eye mesh screens, at last packing.

Claims (2)

1, a kind of colour picture tube aquadag outer conductive paint is characterized in that proportioning following (weight percent) graphite 25-30%, film formation at low temp agent 15-25%, dispersion agent 0.6-1.2%, tensio-active agent 0.1-0.5%, grease proofing stain resistant agents 0.1-4%, the auxiliary 1-10% that films, pure water 30-58%;

Wherein said dispersion agent is methylcellulose gum, Natvosol, cellulose acetate, alkyl biphenyl ether sulfonic acid sodium, fatty alcohol-polyoxyethylene ether or cellulose sulfate ester sodium salt; First three plants material substitution value α at 1.4-1.6;

Wherein tensio-active agent adopts sodium butylnaphthalenesulfonate, succinate sodium sulfonate, W-28 or LT-146;

Wherein styrene-acrylic resin, poly-third resin or polyvinyl alcohol are adopted in the film formation at low temp agent;

Wherein grease proofing stain resistant agents is ethanol, polyvinylpyrrolidone or mandelic resin;

The auxiliary of wherein filming is colloid silicon, potassium silicate, water glass, lithium silicate or Calucium Silicate powder;

Wherein the graphite particle size scope is that particle diameter≤2 μ m account for 45-50%, and 2-4 μ m accounts for 35-45%, and all the other are 4-5 μ m.

2, a kind of manufacturing process of colour picture tube aquadag outer conductive paint of claim 1 is characterized in that product manufacture is as follows:

The powerful surface treatment of A, graphite: (1) press the weight percent of 20-30% with graphite, adds the dispersion agent of 0.1-1.0, is that carrier adds to absolutely usefulness roller ball grinding machine or vibration mill ball milling 1-3 hour then with the pure water; (2) the graphite slurries after will handling dewater with pressure filter, promptly as the graphite raw material of producing colour picture tube aquadag outer conductive paint;

B, manufacturing process (following component and proportioning are all made by the component and the weight percent of power 1),

(1) pure water is invested in the high-speed stirring groove, adds dispersion agent, stirring and dissolving;

(2), be invested in the steel basin high-speed stirring with the graphite raw material of filter-press dehydration;

(3) tensio-active agent and film formation at low temp agent are thrown in, and added the auxiliary of filming simultaneously;

(4) the steel basin homogeneous slurry is pumped in the tumbling mill rolling ball milling 3-6 hour;

(5) slush pump in the tumbling mill is depressed in the middling speed steel basin, adds grease proofing stain resistant agents, stir, detect qualified after, filter with 100 eye mesh screens, at last packing.

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