CN101698771B - Water-based primer-topcoat braking paint and preparation method thereof - Google Patents
Water-based primer-topcoat braking paint and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a water-based primer-topcoat braking paint and a preparation method thereof. The braking paint comprises the following materials by weight percentage: 30-40 of water-based acrylic resin, 2-10 of amino resin, 1-3 of neutralizing agent, 2-5 of compound rustproofing pigment, 1-3 of tinting pigment, 10-20 of filling agent, 0.1-0.5 of defoaming agent, 0.1-0.5 of flatting agent and 25-40 of deionized water, wherein the water-based acrylic resin is a free radical polymerization resultant which comprises the following materials by weight percentage: 10-30 of monomer containing hydroxy acrylic acid, 5-20 of monomer containing carboxyl acrylic acid, 2-8 of internal crosslinking monomer, 20-40 of other acrylic acid monomer, 15-30 of phenyl ethylene monomer, 1-5 of evocating agent and 40-50 of alcohol ether latent solvent. When the paint is prepared, the dispersion and the abrading condition of the pigments and the filling agents are reasonably controlled to ensure that each component of the paint fully plays the respective function. The paint ensures the corrosion prevention effect and the decoration of a coating and realizes the combination of a primer and a topcoat.
Description
Technical field
The present invention relates to a kind of water-based primer-topcoat braking paint and preparation method thereof, be specially adapted to steelwork such as metal machinery antirust, decorate.
Background technology
Water-borne coatings is with water to replace organic solvent, can reduce the use of coating industry organic solvent to a great extent, and have advantages such as less energy-consumption, low emission, has become the developing direction of world's coating.With epoxy resin (being mostly bisphenol A epoxide resin) cathode electrophoresis dope and water-base epoxy-amine curing system of main film forming matter etc.; Have very high sticking power and excellent Corrosion Protection; But the outdoor weatherability of epoxy resin is poor, be prone to efflorescence, loss of gloss; The fullness ratio of filming is not high, should not decorate with lacquer the priming paint of doing commonly used as high-quality outdoor paint with high; The water-and acrylate resin is with its excellent weathering resistance and guarantor's light, tint retention, and application has the excellent decoration performance in various coating, but its Corrosion Protection is poor slightly, the finish paint of doing commonly used.Therefore; Present metallic element such as light fixture, toy, frame of motorcycle, compressor, automobile chassis etc. are in order to reach corrosion-resistant, ageing-resistant and decorate properties preferably; Generally will carry out two step sprayings, promptly spray priming paint and spray paint, its construction is loaded down with trivial details, production cost is than higher.Be badly in need of a kind of water-based bottom surface unification coating of exploitation, to satisfy the demand of growing water-borne coatings with excellent Corrosion Protection and decorate properties.
Summary of the invention
First purpose of the present invention is: a kind of metal parts that is applicable to is provided, and an application can obtain the water-based primer-topcoat braking paint that not only has the priming paint Corrosion Protection but also have the finish paint decorate properties.
The technical scheme that realizes first purpose of the present invention is: the baked paint of a kind of water-based bottom surface unification, and it is made up of following component, and its each amounts of components is following: water-borne acrylic resin 30～40%; Aminoresin 2～10%, neutralizing agent 1～3%, composite antirust pigment 2～5%; Tinting pigment 1～3%, filler 10～20%, skimmer 0.1～0.5%; Flow agent 0.1～0.5%, deionized water 25～40%;
Said water-borne acrylic resin is with hydroxy acryl acid class monomer 10～30%; Contain carboxy acrylic class monomer 5～20%; Interior cross-linking monomer 2～8%, other acrylic monomers 20～40%, styrene monomer 15～30%; Initiator 1～5%, pure ethers solubility promoter 40～50% are the Raolical polymerizable product of raw material;
Above per-cent is weight part per-cent;
Said aminoresin is methylated melamine formaldehyde resin or butyl alcohol etherified melamine-formaldehyde resin;
Said composite antirust pigment is made up of >=3 kinds of environment-friendly type rust-stabilising pigments.
In the baked paint of above-mentioned water-based bottom surface unification, the hydroxy acryl acid class monomer that is used as said water-borne acrylic resin raw material is one or more in Propylene glycol monoacrylate, Hydroxyethyl acrylate, the caprolactone; Contain carboxy acrylic class monomer and be in the acrylic or methacrylic acid one or both; Other acrylic monomer is one or more in TEB 3K, NSC 20956, methyl acrylate, the Bing Xisuandingzhi; Styrene monomer is one or more in vinylbenzene, a vinyl toluene, the p-methylstyrene; Interior cross-linking monomer is one or both in SY-Monomer G, the acrylic amide; Initiator is peroxide initiator or azo-initiator; Alcohol ethers solubility promoter is one or several in propylene glycol monomethyl ether, butyl glycol ether, the ethylene glycol ethyl ether.
The baked paint of above-mentioned water-based bottom surface unification, the concrete grammar of its synthetic said water-borne acrylic resin is following:
The pure ethers solubility promoter that in reaction vessel, adds the part formula ratio stirs and is warming up to temperature of reaction, under this temperature, drips the mixture of being made up of the initiator of all monomers of whole formula ratios and part formula ratio; The dropping time is 4～5h, after dropwising, is incubated 0.5h at least in temperature of reaction; Drip the mixture of remaining initiator and remaining pure ethers solubility promoter again; After dropwising, again at temperature of reaction insulation reaction 2～3h, the cooling stopped reaction promptly makes water-borne acrylic resin.
In the baked paint of above-mentioned water-based bottom surface unification, said composite antirust pigment by among environment-friendly type rust-stabilising pigment zn phosphate, aluminium triphosphate, zinc oxide, titanium-iron powder, composite titanium iron powder, zinc molybdate, barium metaborate, calcium phosphate, phospho-molybdic acid zinc, the AC-5 etc. >=3 kinds form.
In the baked paint of above-mentioned water-based bottom surface unification, said filler is one or more in talcum powder, permanent white, sericite in powder, kaolin, silica powder, the zeyssatite.
In the baked paint of above-mentioned water-based bottom surface unification, said tinting pigment is one or more in carbon black, titanium white, zinc white, iron oxide black, yellow oxide of iron, red iron oxide, barba hispanica, the ultramarine; Said skimmer is type siloxane skimmer, polyethers skimmer or fatty amide defoamer; Said flow agent is silicone based flow agent or acrylic acid or the like flow agent; Said neutralizing agent is a kind of in triethylamine, the dimethylethanolamine; Said de-ionized electrical conductivity of water≤20 μ s/cm.
Second purpose of the present invention is: provide a kind of and can guarantee coating quality and the easy-operating method for preparing water-based primer-topcoat braking paint.
The technical scheme that realizes second purpose of the present invention is: a kind of method for preparing above-mentioned water-based primer-topcoat braking paint, and its concrete steps are following:
(1) prepares following raw material
Water-borne acrylic resin 30～40%, aminoresin 2～10%, neutralizing agent 1～3%, composite antirust pigment 2～5%; Tinting pigment 1～3%, filler 10～20%, skimmer 0.1～0.5%; Flow agent 0.1～0.5%, deionized water 25～40%, above per-cent is weight part per-cent;
(2) concrete operations
1. the water-borne acrylic resin, aminoresin, neutralizing agent, skimmer and the flow agent that in Scattered Kettle, add formula ratio mix; Stir with high speed dispersor again; This moment, dispersing speed was controlled at 400～500 rev/mins of scopes, churning time at least 10 minutes;
2. the deionized water that adds the part formula ratio, this moment, dispersing speed increased to 500～700 rev/mins, was stirred to that material becomes the oyster white homogeneous dispersion in the Scattered Kettle;
3. the oyster white homogeneous dispersion that 2. step is made shifts out half amount from Scattered Kettle; Preserve in addition, in Scattered Kettle, add tinting pigment, composite antirust pigment and the filler of formula ratio then, control dispersing speed at 500～800 rev/mins this moment; Churning time at least 15 minutes; Improve dispersing speed to 1000 rev/min then, churning time is at least 20 minutes, makes finely dispersed slurry;
4. the slurry that 3. step is made moves into sand mill and grinds, and the sand mill flow control made one ground slurry fineness reach 45 microns at 4～4.5 hours/ton, and two road ground slurry fineness reach 20 microns, get final product;
5. the grinding disposed slurry that 4. step is made moves in the Scattered Kettle again, and half amount oyster white homogeneous dispersion that 3. step is shifted out adds in Scattered Kettle and carries out paint, and this moment, dispersing speed was controlled at 700～800 rev/mins, and churning time was at least 15 minutes;
6. filter with 80～200 mesh filter screens, packing promptly makes water-based primer-topcoat braking paint of the present invention.
Among the preparation method of the baked paint of above-mentioned water-based bottom surface unification, said water-borne acrylic resin is with hydroxy acryl acid class monomer 10～30%, contains carboxy acrylic class monomer 5～20%; Interior cross-linking monomer 2～8%; Other acrylic monomers 20～40%, styrene monomer 15～30%, initiator 1～5%; Alcohol ethers solubility promoter 40～50% is the Raolical polymerizable product of raw material, and above per-cent is weight part per-cent;
Said aminoresin is methylated melamine formaldehyde resin or butyl alcohol etherified melamine-formaldehyde resin;
Said composite antirust pigment is made up of >=3 kinds of environment-friendly type rust-stabilising pigments.
Among the preparation method of the baked paint of above-mentioned water-based bottom surface unification, said composite antirust pigment by among environment-friendly type rust-stabilising pigment zn phosphate, aluminium triphosphate, zinc oxide, titanium-iron powder, composite titanium iron powder, zinc molybdate, barium metaborate, calcium phosphate, phospho-molybdic acid zinc, the AC-5 etc. >=3 kinds form.
Among the preparation method of the baked paint of above-mentioned water-based bottom surface unification, said filler is one or more in talcum powder, permanent white, sericite in powder, kaolin, silica powder, the zeyssatite; Said tinting pigment is one or more in carbon black, titanium white, zinc white, iron oxide black, yellow oxide of iron, red iron oxide, barba hispanica, the ultramarine; Said skimmer is type siloxane skimmer, polyethers skimmer or fatty amide defoamer; Said flow agent is silicone based flow agent or acrylic acid or the like flow agent; Said neutralizing agent is a kind of in triethylamine, the dimethylethanolamine; Said de-ionized electrical conductivity of water≤20 μ s/cm.
Technique effect of the present invention is: the water-based primer-topcoat braking paint that adopts technical scheme of the present invention to make has following beneficial effect: 1. monomer and the consumption thereof when synthetic, selected for use in the employed raw material of the main film forming matter water-borne acrylic resin of coating is appropriate; The interior cross-linking monomer that proper amt is particularly arranged; Make water-borne acrylic resin inside have certain interior crosslinking structure; Its solidification effect is good behind high bake, has improved the compactness of filming; The aminoresin that adopts is a kind of methylated melamine formaldehyde resin or butyl alcohol etherified melamine-formaldehyde resin with polyfunctionality; When film-forming; Can obtain to have filming of tridimensional network with water-borne acrylic resin, making films has proper intensity and toughness; Adopt composite antirust pigment can give full play to the rust-proof effect of each rust-stabilising pigment and also have synergy each other; Because this composite antirust pigment is environment-friendly type (not containing heavy metal ion); Meet a compulsory standard of formulating by European Union's legislation; Its full name is " about being limited in the instruction of using some objectionable constituent in the electronic and electrical equipment ", is called for short the RoHS standard; Each component collocation of coating of the present invention better effect of each component of performance rationally, and each component synergetic property is good.Filming of coating of the present invention detected, and result's (seeing table 3) shows that filming has excellent rustless property (salt spray resistance can reach 400h) and excellent weathering resistance and guarantor's light, tint retention, has the effect of bottom surface unification; When 2. preparing coating of the present invention; Reasonably control dispersing of pigments and grinding condition; Various pigment and filler can both well be dispersed in the binder resin, guarantee that each component of coating gives full play to effect separately, and then the anticorrosion ability that has guaranteed to film and ornamental.
Embodiment
Below in conjunction with embodiment the present invention is done further specific descriptions, but be not limited to this.
Unless otherwise indicated raw materials used among the embodiment, be coating and use commercially available article, the raw material consumption is weight part.
Embodiment 1 preparation water-borne acrylic resin A1
(1) prescription
Water-borne acrylic resin is with hydroxy acryl acid class monomer 10～30%; Contain carboxy acrylic class monomer 5～20%, interior cross-linking monomer 2～8%, other acrylic monomers 20～40%; Styrene monomer 15～30%; Initiator 1～5%, pure ethers solubility promoter 40～50% is the Raolical polymerizable product of raw material, above per-cent is weight part per-cent;
Concrete prescription is seen table 1.
Table 1
(2) preparation technology
Press the formula ratio of table 1,212 weight part butyl glycol ethers and 122.7 weight part propylene glycol monomethyl ethers are joined in the 1000ml four-hole boiling flask that TM, whipping appts and condensing works are housed, start stirring and be warming up to 110 ℃ of temperature of reaction; The mixture stirring and dissolving of all monomers of whole formula ratios and 8 weight part Lucidols is even; Slowly be added drop-wise to then in the above-mentioned four-hole boiling flask, drip 4h, after dropwising; Keep 0.5h for 110 ℃ in temperature of reaction; Drip the mixture of remaining 2 weight part Lucidols and remaining 74.4 weight part butyl glycol ethers again, drip time 1h, at last at 110 ℃ of insulation reaction 2h of temperature of reaction; The cooling stopped reaction promptly makes water-borne acrylic resin A1, and its solid is divided into 55 weight %.
Embodiment 2 preparation water-borne acrylic resin A2
Basic identical with embodiment 1, make water-borne acrylic resin A2, its solid is divided into 55 weight %, and difference is: linking agent glycidyl acrylate consumption is 5 weight parts, and the acrylic amide consumption is 20 weight parts.
It is raw materials used with embodiment 2 that the raw material of synthetic water based acrylic resin is not limited to embodiment 1, can from the following raw material of enumerating, select:
Hydroxy acryl acid class monomer is one or more in Propylene glycol monoacrylate, Hydroxyethyl acrylate, the caprolactone;
Contain carboxy acrylic class monomer and be in the acrylic or methacrylic acid one or both;
Other acrylic monomer is one or more in TEB 3K, NSC 20956, methyl acrylate, the Bing Xisuandingzhi;
Styrene monomer is one or more in vinylbenzene, a vinyl toluene, the p-methylstyrene;
Interior cross-linking monomer is one or both in SY-Monomer G, the acrylic amide;
Initiator is peroxide initiator or azo-initiator;
Alcohol ethers solubility promoter is one or several in propylene glycol monomethyl ether, butyl glycol ether, the ethylene glycol ethyl ether.
Embodiment 3 preparation water-based primer-topcoat braking paint 1#
(1) prescription: water-borne acrylic resin 30～40 weight parts, aminoresin 2～10 weight parts, neutralizing agent 1～3 weight part; Composite antirust pigment 2～5 weight parts, tinting pigment 1～3 weight part, filler 10～20 weight parts; Skimmer 0.1～0.5 weight part; Flow agent 0.1～0.5 weight part, deionized water 25～40 weight parts, concrete prescription is seen table 2.
Table 2
Annotate: R717 in the table 2 (methylated melamine formaldehyde resin) is Britain's Ineos Company products trade mark; BYK022 (silicane skimmer) and BYK331 (silicone based flow agent) are the German Bi Ke chemistry Company products trade mark; The PU carbon black is the German Degussa Company products trade mark; AC-5 is a U.S. W. R. Grace & Co product grade.
(2) preparation technology
1. the water-borne acrylic resin, aminoresin, neutralizing agent, skimmer and the flow agent that in Scattered Kettle, add formula ratio mix; Stir with high speed dispersor again; This moment, dispersing speed was controlled at 400～500 rev/mins of scopes, churning time at least 10 minutes;
2. the deionized water that adds the part formula ratio, this moment, dispersing speed increased to 500～700 rev/mins, stirred 15 minutes, and material becomes the oyster white homogeneous dispersion to the Scattered Kettle;
3. the oyster white homogeneous dispersion that 2. step is made shifts out half amount from Scattered Kettle; Preserve in addition, in Scattered Kettle, add tinting pigment, composite antirust pigment and the filler of formula ratio then, control dispersing speed at 500～800 rev/mins this moment; Churning time 15 minutes; Improve dispersing speed to 1000 rev/min then, churning time is 20 minutes, makes finely dispersed slurry;
4. the slurry that 3. step is made moves into sand mill and grinds, and the sand mill flow control made one ground slurry fineness reach 45 microns at 4～4.5 hours/ton, and two road ground slurry fineness reach 20 microns, promptly meet index request;
5. the grinding disposed slurry that 4. step is made moves in the Scattered Kettle again, and half amount oyster white homogeneous dispersion that 3. step is shifted out adds in Scattered Kettle and carries out paint, and this moment, dispersing speed was controlled at 700～800 rev/mins, and churning time is 15 minutes;
6. filter with 80～200 mesh filter screens, packing promptly makes water-based primer-topcoat braking paint 1# of the present invention.
Embodiment 4 preparation water-based primer-topcoat braking paint 2#
Basic identical with embodiment 3, make water-based primer-topcoat braking paint 2# of the present invention, difference is: the A2 that water-and acrylate uses embodiment 2 to make.
It is raw materials used with embodiment 4 to prepare the raw materials used embodiment of being not limited to of coating of the present invention 3, can be from following material choice:
Composite antirust pigment by among environment-friendly type rust-stabilising pigment zn phosphate, aluminium triphosphate, zinc oxide, titanium-iron powder, composite titanium iron powder, zinc molybdate, barium metaborate, calcium phosphate, phospho-molybdic acid zinc, the AC-5 etc. >=3 kinds form;
Filler is one or more in talcum powder, permanent white, sericite in powder, kaolin, silica powder, the zeyssatite;
Tinting pigment is one or more in carbon black, titanium white, zinc white, iron oxide black, yellow oxide of iron, red iron oxide, barba hispanica, the ultramarine;
Skimmer is type siloxane skimmer, polyethers skimmer or fatty amide defoamer;
Flow agent is silicone based flow agent or acrylic acid or the like flow agent;
Neutralizing agent is a kind of in triethylamine, the dimethylethanolamine.
The performance of embodiment 5 test water-based primer-topcoat braking paints
Press coatings industry concerned countries standard detection film performance.Detect used model: plate size 10cm * 5cm, the surface sprays the coating 1# and the 2# of preparation respectively after oil removing, polishing, first surface drying 20min, again in 140 ℃ of baking 30min, build 20 ± 2 μ m, detected result is listed in table 3.
Table 3
| Project | Index | The 1# coating property | The 2# coating property |
| Color and outward appearance | Black, smooth | Black, smooth | Black, smooth |
| Viscosity (being coated with-4 glasss) | ≥60 | 120 | 96 |
| Opacifying power ,<= | 40 | 23 | 20 |
| Gloss (60 °) | 10～90 | 79 | 92 |
| Shock-resistant, cm | 50 | 50 | 50 |
| Sticking power (drawing lattice) ,<=level | 1 | 1 | 1 |
| Snappiness (mm) ,<= | 1 | 1 | 1 |
| Pencil hardness, >= | H | 2H | 2H |
| Salt spray resistance 400h, level | Qualified | Qualified | Qualified |
| Weathering resistance 400h, level | 1 | 1 | 1 |
| The RoHS standard | Meet | Meet | Meet |
| VOC，g/L ≤ | 200 | 200 | 200 |
Table 3 detected result can be found out, with the baked paint of 1# of the present invention and the unification of 2# water-based bottom surface, its shock-resistant 50cm that all reaches that films; Snappiness and sticking power reach 1 grade; Pencil hardness is 2H, and salt spray resistance and weathering resistance reach 400h, and the VOC quantity discharged is less than 200g/L; The 2# coating gloss does not contain heavy metal ion a little more than 1# coating and this coating, satisfies the RoHS standard of European Union.
Coating of the present invention has good rustless property and decorate properties, can be widely used in antirust, the decoration of steelwork such as metallic element such as light fixture, toy, frame of motorcycle, compressor, automobile chassis.
Claims (2)
1. the baked paint of water-based bottom surface unification is characterized in that be made up of following component, its each amounts of components is following:
Water-borne acrylic resin 450 weight parts, aminoresin 36 weight parts, neutralizing agent dimethylethanolamine 18 weight parts; Composite antirust pigment 35 weight parts, tinting pigment 20 weight parts, filler 138 weight parts; Skimmer 1.5 weight parts, flow agent 1.5 weight parts, deionized water 300 weight parts;
Wherein, aminoresin is R717, and it is the product grade of the methylated melamine formaldehyde resin of Britain Ineos company; Composite antirust pigment is by the product A C-5 of 10 weight part U.S. W. R. Grace & Co, and 15 weight part aluminium triphosphates and 10 part by weight of zinc oxide are formed; Tinting pigment is the product P U carbon black of German Degussa company; Filler is made up of 80 weight part permanent white and 58 weight part talcum powder; Skimmer is BYK022, and it is the product grade of the silicane skimmer of German Bi Ke chemical company; Flow agent is BYK331, and it is the product grade of the silicone based flow agent of German Bi Ke chemical company; Deionized water is self-control, specific conductivity≤20 μ s/cm;
Said water-borne acrylic resin is with Propylene glycol monoacrylate 115.8 weight parts, vinylformic acid 32 weight parts, Bing Xisuandingzhi 180 weight parts; Vinylbenzene 137.5 weight parts, interior cross-linking monomer glycidyl acrylate 10 weight parts and acrylic amide 15 weight parts, initiator Lucidol 10 weight parts; Alcohol ethers solubility promoter butyl glycol ether 286.4 weight parts and propylene glycol monomethyl ether 122.7 weight parts are the Raolical polymerizable product of raw material, by above-mentioned formula ratio, 212 weight part butyl glycol ethers and 122.7 weight part propylene glycol monomethyl ethers are joined in the 1000ml four-hole boiling flask that TM, whipping appts and condensing works are housed; Start to stir and be warming up to 110 ℃ of temperature of reaction, the mixture stirring and dissolving of all monomers of whole formula ratios and 8 weight part Lucidols is even, slowly be added drop-wise in the above-mentioned four-hole boiling flask then; Drip 4h; After dropwising, keep 0.5h for 110 ℃, drip the mixture of remaining 2 weight part Lucidols and remaining 74.4 weight part butyl glycol ethers again in temperature of reaction; Dropping time 1h; At 110 ℃ of insulation reaction 2h of temperature of reaction, the cooling stopped reaction promptly makes water-borne acrylic resin at last, and its solid is divided into 55 weight %;
Preparation technology is following:
1. the water-borne acrylic resin, aminoresin, neutralizing agent, skimmer and the flow agent that in Scattered Kettle, add formula ratio mix; Stir with high speed dispersor again; This moment, dispersing speed was controlled at 400～500 rev/mins of scopes, churning time at least 10 minutes;
2. the deionized water that adds the part formula ratio, this moment, dispersing speed increased to 500～700 rev/mins, stirred 15 minutes, and material becomes the oyster white homogeneous dispersion to the Scattered Kettle;
3. the oyster white homogeneous dispersion that 2. step is made shifts out half amount from Scattered Kettle; Preserve in addition, in Scattered Kettle, add tinting pigment, composite antirust pigment and the filler of formula ratio then, control dispersing speed at 500～800 rev/mins this moment; Churning time 15 minutes; Improve dispersing speed to 1000 rev/min then, churning time is 20 minutes, makes finely dispersed slurry;
4. the slurry that 3. step is made moves into sand mill and grinds, and the sand mill flow control made one ground slurry fineness reach 45 microns at 4～4.5 hours/ton, and two road ground slurry fineness reach 20 microns, promptly meet index request;
5. the grinding disposed slurry that 4. step is made moves in the Scattered Kettle again, and half amount oyster white homogeneous dispersion that 3. step is shifted out adds in Scattered Kettle and carries out paint, and this moment, dispersing speed was controlled at 700～800 rev/mins, and churning time is 15 minutes;
6. filter with 80～200 mesh filter screens, packing promptly makes water-based primer-topcoat braking paint.
2. method for preparing the water-based primer-topcoat braking paint of claim 1 is characterized in that concrete steps are following:
(1) prepares raw material
Press the formula ratio of each component of coating of claim 1, prepare the raw material of each component;
(2) preparation technology
1. the water-borne acrylic resin, aminoresin, neutralizing agent, skimmer and the flow agent that in Scattered Kettle, add formula ratio mix; Stir with high speed dispersor again; This moment, dispersing speed was controlled at 400～500 rev/mins of scopes, churning time at least 10 minutes;
2. the deionized water that adds the part formula ratio, this moment, dispersing speed increased to 500～700 rev/mins, stirred 15 minutes, and material becomes the oyster white homogeneous dispersion to the Scattered Kettle;
3. the oyster white homogeneous dispersion that 2. step is made shifts out half amount from Scattered Kettle; Preserve in addition, in Scattered Kettle, add tinting pigment, composite antirust pigment and the filler of formula ratio then, control dispersing speed at 500～800 rev/mins this moment; Churning time 15 minutes; Improve dispersing speed to 1000 rev/min then, churning time is 20 minutes, makes finely dispersed slurry;
4. the slurry that 3. step is made moves into sand mill and grinds, and the sand mill flow control made one ground slurry fineness reach 45 microns at 4～4.5 hours/ton, and two road ground slurry fineness reach 20 microns, promptly meet index request;
5. the grinding disposed slurry that 4. step is made moves in the Scattered Kettle again, and half amount oyster white homogeneous dispersion that 3. step is shifted out adds in Scattered Kettle and carries out paint, and this moment, dispersing speed was controlled at 700～800 rev/mins, and churning time is 15 minutes;
6. filter with 80～200 mesh filter screens, packing promptly makes water-based primer-topcoat braking paint.
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