CN101724326B - Waterborne organic silicon-acrylic acid self-stratifying coating - Google Patents

Waterborne organic silicon-acrylic acid self-stratifying coating Download PDF

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CN101724326B
CN101724326B CN2009103113142A CN200910311314A CN101724326B CN 101724326 B CN101724326 B CN 101724326B CN 2009103113142 A CN2009103113142 A CN 2009103113142A CN 200910311314 A CN200910311314 A CN 200910311314A CN 101724326 B CN101724326 B CN 101724326B
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organic silicon
coating
emulsion
organosilicon
acrylic acid
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CN2009103113142A
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Chinese (zh)
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CN101724326A (en
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李美江
来国桥
蒋剑雄
倪勇
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杭州师范大学
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Abstract

The invention relates to a waterborne organic silicon-acrylic acid self-stratifying coating. The invention solves the technical problem of poor self-stratifying property and provides a waterborne organic silicon-acrylic acid self-stratifying coating and a method for preparing the same. In the waterborne organic silicon-acrylic acid self-stratifying coating of the invention, under a condition of lower content of organic silicon, the performance of the conventional silicon acrylic emulsion with high organic silicon content is achieved, and moreover the cost advantage is obvious. The coating is characterized in that: the coating is prepared from the following raw materials in percentage by weight: 10 to 15 percent of organic silicon emulsion, 50 to 60 percent of acrylic emulsion, 5 to 10 percent of organic silicon modified acrylic emulsion, 5 to 7 percent of filling material, 5 to 7 percent of dye, 0.2 to 0.5 percent of thickener, 2 to 3 percent of auxiliary agent, and 10 to 20 percent of water. The preparation method comprises the following steps of: 1, adding the water and auxiliary agent to a paste mixing container; 2, adding fillers and dyes; 3, grinding the mixture to obtain the color paste; 4, adding other raw materials in a paint mixing container; 5, adding the thickener; and 6, filtering the mixed raw materials to obtain the finished product.

Description

A kind of waterborne organic silicon-acrylic acid self-stratifying coating
Technical field
The present invention relates to a kind of chemistry painting industry, specifically is a kind of waterborne organic silicon-acrylic acid self-stratifying coating.
Background technology
Organosilicon-acrylic coating is the new coating that development in recent years is rapid and have wide market application foreground.It had both had organosilicon fire-resistant property, ultra-violet resistance, durability in oxidative degradation, low, the good permeability of surface energy, had snappiness, guarantor's light, tint retention, the high tack of acrylic resin again, was the coating variety of one type of excellent combination property.Waterborne organic silicon-acrylic coating environmental friendliness; Be widely used as trade sales coating, hide finishes and tackiness agent etc.; Particularly can be used for the exterior coating of important building or high-rise high-rise building,, become the focus product that people competitively develop, produce always from the nineties in 20th century.
Waterborne organic silicon-acrylic acid self-stratifying coating has gradient from layer functions.In the coating film process, vinyl resin moves to basic unit, the sticking power of increase and building surface, and the organosilicon component is moved to the top layer, improves the pollution resistance and the weathering resistance of surface coatings.It is ultimate attainment from layering organosilicon-acrylic coating organosilicon performance limited in the coating to be performed to, and can be implemented under the situation of low organosilicon content, reach the performance of the traditional silicon acrylic emulsion of higher organosilicon content, and cost advantage is obvious.
The preparation method of existing waterborne organic silicon-acrylic coating has two kinds: physical blending and chemical modification.For physical blending organosilicon-acrylic coating; Be directly to add organic silicon emulsion or dispersion liquid in the acrylic ester emulsion; Chemical reaction does not take place between two kinds of emulsions; Because organosilicon and vinylformic acid surface energy difference are big, be prone to layering, do not satisfy the requirement of each component polymer stable existence in the self stratifying coating; Equally for chemical modification organosilicon-vinyl resin; Adopt an organosilane monomer and Acrylic Acid Monomer emulsion copolymerization, molecule combines with chemical bond, good stability; In the film-forming process, be difficult to automatic separation, so can not directly be used for preparation from layering organosilicon-acrylic coating.
Employing silicone resins such as Li Yonghua and organosilicon inarch PEMULEN TR2 and vinyl resin have been feedstock production solvent type organic silicone modified vinyl resin self stratifying coating.These solvents evaporate in construction process in the atmosphere, and not only the health of human body to the constructor works the mischief, and pollutes the environment, and cause the hidden danger of fire in addition.Synthesis technique and organo-siloxane open loop polycondensation and the reaction principle free-radical polymerized with propenoate thereof that Yang Zesheng etc. utilize preparatory emulsification to drip have continuously prepared from stratified organosilicon-modified acrylate emulsion.In this method owing to take the method for copolymerization to prepare polymeric constituent in the coating, be difficult to the molecular structure of controlling polymers, cause product from shortcomings such as layering performance poor repeatability.
Summary of the invention
The technical issues that need to address of the present invention are: existing waterborne organic silicon-acrylic coating for reaching coating performance preferably, needs to improve the organosilicon components contents from the layering poor performance.The present invention provides a kind of waterborne organic silicon-acrylic acid self-stratifying coating and method of manufacture thereof, is implemented under the situation of low organosilicon content, reaches the performance of the traditional silicon acrylic emulsion of higher organosilicon content.
For the waterborne organic silicon acrylic coating is had from the layering performance, the technical scheme that adopts physical mixed and chemical modification to combine among the present invention,
Waterborne organic silicon-acrylic acid self-stratifying coating of the present invention is characterized in that: it comprises that the material of following weight percent is a raw material, through preparing product:
Organic silicon emulsion 10~15%,
ACRYLIC EMULSION 50~60%,
Organosilicon-modified acrylic emulsion 5~10%,
Filler 5~7%,
Pigment 5~7%,
Thickening material 0.2~0.5%,
Auxiliary agent 2~3%,
Water 10~20%;
Described organic silicon emulsion is to pass through RSiX 3Monomer and R 1R 2SiX 2Monomer is 1: 10~20 in molar ratio, carries out the emulsion copolymerization reaction and obtains; Wherein: R, R 1, R 2Respectively be selected from a kind of (wherein methyl best results) in methyl, ethyl, propyl group, phenyl, vinyl, trifluoro propyl, aminopropyl, chloropropyl, epoxypropyl, hydroxypropyl, the mercapto propyl group, X is selected from oxyethyl group, methoxyl group;
Described organosilicon-modified acrylic emulsion is by functional group ZGK 5, an organosilane monomer, press mass ratio 10~20 with Acrylic Acid Monomer or acrylate monomer: 1: 20~40, get through letex polymerization; Wherein: vinylformic acid or acrylate monomer are one or more the mixture in methylacrylic acid methyl, Jia Jibingxisuanyizhi, NSC 20956, methyl acrylate, ethyl propenoate, Bing Xisuandingzhi, vinylformic acid, the methylacrylic acid; The functional group ZGK 5 is ethenyl blocking YSR 3286 or hydroxyl endblocked polydimethylsiloxane, and an organosilane monomer is one or more the mixture in vinyltrimethoxy silane, vinyltriethoxysilane, methyl ethylene dimethoxy silane, methyl ethylene diethoxy silane, gamma-methyl allyl acyloxypropyl trimethoxysilane, gamma-methyl allyl acyloxypropyl triethoxyl silane, gamma-methyl allyl acyloxypropyl methyl dimethoxysilane, the gamma-methyl allyl acyloxypropyl methyldiethoxysilane;
Its preparation method is following steps:
1) in joining the slurry container, adds entry and auxiliary agent, stir;
2) add filler and pigment in the compound that in step 1), obtains, stir;
3) with step 2) in the mixture that obtains be ground to below the fineness 30 μ m, obtain mill base;
4) in the paint container, add mill base, organic silicon emulsion, organosilicon-modified acrylic emulsion, ACRYLIC EMULSION, stir;
5) add thickening material in the compound that in step 4), obtains, stir;
6) compound that step 5) is obtained filters (filtering larger particles), obtains waterborne organic silicon-acrylic acid self-stratifying coating.
Organic silicon emulsion of the present invention passes through RSiX 3Monomer and R 1R 2SiX 2Monomer adds emulsifying agent and makes through the emulsion copolymerization reaction, contains trifunctional silica chain link (RSiO 1.5), when organic silicon components migrated to coatingsurface, the curing of coatingsurface was accomplished in the polycondensation through functional group, makes coatingsurface bright and clean, had best waterproof and dustproof effect.
ACRYLIC EMULSION of the present invention can adopt commercially available ACRYLIC EMULSION, for example B-96 emulsion, AC-261 emulsion.
The organosilicon modified crylic acid resin emulsion that the present invention adopted by functional group ZGK 5, an organosilane monomer and Acrylic Acid Monomer or acrylate monomer (letter is vinylformic acid (ester) monomer) add emulsifying agent, initiator gets through letex polymerization.
Because the consistency of silicone resin and vinyl resin is poor, be easy to layering, directly adopt silicone resin and vinyl resin blend, be difficult to stable existence in same system.In system, when adding organosilicon modified crylic acid resin, played the effect of compatilizer, thereby realized the stability of system at both.The applicant discovers, adopts common and vinylformic acid (ester) the class monomer of functional group ZGK 5 and an organosilane monomer to carry out the emulsion copolymerization grafting, and the consistency effect that obtains multipolymer is best.Contain two keys in an organosilane monomer, can carry out free-radical polymerizedly, contain alkoxyl group in an organosilane monomer simultaneously,, improve the grafting efficiency of multipolymer with the hydroxyl generation polycondensation in the ZGK 5 with vinylformic acid (ester) monomer.When the employing of functional group ZGK 5 contained the vinyl ZGK 5, vinyl can carry out free-radical polymerized with an organosilane monomer and vinylformic acid (ester) monomer equally.The consumption of organosilicon modified crylic acid resin also has certain scope, and consumption is too big, and the stability of coating strengthens, but in the film forming process of coating, organosilicon and vinyl resin are difficult to layering, have lost from the layering performance.Consumption very little, silicone resin and vinyl resin are difficult to stable existence, have influenced the use properties of coating, cause simultaneously that to be coated with the interlayer bonding force poor, are prone to come off.The consumption of organosilicon modified crylic acid resin emulsion is 5~10%.
Organic silicon emulsion polymerization of the present invention and organosilicon-modified acrylic emulsion polymeric emulsifying agent are: a kind of in sodium lauryl sulphate, the X 2073; Used initiator is Potassium Persulphate or ammonium persulphate.
Filler commonly used is a kind of in light calcium carbonate, process white, talcum powder or the mica powder in the production; Pigment is a kind of in iron oxide black, red iron oxide, yellow oxide of iron, the white titanium pigment; Thickening material is a kind of in Natvosol, the ZX-I.
The auxiliary agent that also should add coating weight 2~3% in the preparation process of coating.Auxiliary agent comprises dispersion agent, wetting agent, skimmer, mould inhibitor, sanitas and membrane-forming agent.Used dispersion agent is sodium, ammonium, the amine salt of alkenyl monomer and unsaturated carboxylic acid and lipid multipolymer thereof, and for example: 5040 dispersion agents, 5027 dispersion agents, T-731 dispersion agent, consumption are 0.1~0.3% of coating content; Wetting agent is selected polyether-modified alkynol for use, and like SURFYNOLGA, SURFYNOL TG, consumption is 0.1~0.3% of a coating content; Skimmer is selected organic silicon modified by polyether for use, and like SN313, NXZ, NDW, BYK 024, consumption is 0.01~0.1% of a coating content; Sanitas can be KATHONLXE, HX-89, and consumption is 0.1~0.3% of a coating; Mould inhibitor can be SKANE M-8, BCM sanitas, and consumption is 0.1~0.5% of a coating; Membrane-forming agent is one or more the mixture in ethylene glycol ethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, terepthaloyl moietie, the Ucar 35, and consumption is 1.5~2% of a coating content.
The present invention makes the water-soluble organic silicon acrylic coating of development have gradient from layer functions through Molecular Structure Design and component collocation cleverly.In the coating film process, vinyl resin moves to basic unit, the sticking power of increase and building surface, and the organosilicon component is moved to the top layer, improves the pollution resistance and the weathering resistance of surface coatings.Compared with prior art, it is ultimate attainment that organosilicon performance limited in the coating is performed to, and can be implemented under the situation of low organosilicon content, reach the performance of the traditional silicon acrylic emulsion of higher organosilicon content, and cost advantage is obvious.
Embodiment
Through embodiment, do further bright specifically below to technical scheme of the present invention.
Embodiment 1
The preparation of organic silicon emulsion: in three mouthfuls of reaction flasks of the 500ml that stirring, reflux exchanger and constant pressure funnel are housed, add 100g water, 15g sodium lauryl sulphate, 0.3g sodium hydroxide, start stirring and make emulsifiers dissolve.Be warming up to 80 ℃, drip the mixture of 65g dimethyldiethoxysilane and 5g Union carbide A-162,10min dropwises.Continue reaction 6h.After reaction finishes,, obtain organic silicon emulsion with the Glacial acetic acid min. 99.5 neutralization.
The preparation of organosilicon-modified acrylic emulsion: 20g ethenyl blocking YSR 3286 (molecular weight is 2000), 1g vinyltriethoxysilane, 18g Bing Xisuandingzhi, 18g TEB 3K, 0.8g X 2073 and 100g deionized water are joined in the four-necked bottle; Fully stir; Logical nitrogen 30min deoxygenation with after the warming-in-water to 70 ℃, adds the 0.4g ammonium persulphate; Insulation 6h obtains organosilicon-modified acrylic emulsion.
The composition of waterborne organic silicon-acrylic acid self-stratifying coating: organic silicon emulsion 10g, ACRYLIC EMULSION 57g, organosilicon-modified acrylic emulsion 8g, light calcium carbonate 6g, white titanium pigment 6g, Natvosol 0.3g, 5040 dispersion agent 0.1g, SURFYNOL GA 0.2g, SN 313 0.05g, KATHON LXE 0.2g, SKANE M-8 0.5g, terepthaloyl moietie 1.5g, water 10.15g.
Waterborne organic silicon-acrylic acid self-stratifying coating prepares through following steps:
1) in joining the slurry container, adds 10.15g water and 0.1g 5040 dispersion agents, 0.2g SURFYNOL GA, 0.05g SN313,0.2g KATHON LXE, 0.5g SKANE M-8,1.5g terepthaloyl moietie, stir;
2) add 6g light calcium carbonate and 6g white titanium pigment in the compound that in step 1), obtains, stir;
3) with step 2) in the mixture that obtains be ground to fineness 25 μ m, obtain mill base;
4) in the paint container, add mill base, 10g organic silicon emulsion, 8g organosilicon-modified acrylic emulsion, 57g AC-261 Emulsion acrylic resin, stir;
5) add the 0.3g Natvosol in the compound that in step 4), obtains, stir;
6) compound that step 5) is obtained filters, and the filtering larger particles obtains waterborne organic silicon-acrylic acid self-stratifying coating.
Prepared organosilicon-acrylic coating is cured, and with each layer silicone content in the X-gamma spectrometer test latex film cross section, the result is:
The latex film cross section number of plies 1 2 3 4 5 6 7 8 9 10
Silicon content (%) 3.5 3.6 3.2 3.0 2.6 2.1 1.7 1.5 1.3 1.2
Annotate: the latex film cross section is divided into 10 layers, and the 1st layer is upper surface, and 10 layers is lower surface.
Can find out that the content of different sectional position element silicons is different, explain that the coating of preparation has significantly from layer functions.
Embodiment 2
The preparation of organic silicon emulsion: in three mouthfuls of reaction flasks of the 500ml that stirring, reflux exchanger and constant pressure funnel are housed, add 100g water, 10g X 2073,0.5g sodium hydroxide, start stirring and make emulsifiers dissolve.Be warming up to 70 ℃, drip the mixture of 60g dimethyldimethoxysil,ne and 9.0g aminopropyl trimethoxysilane, 15min dropwises.Continue reaction 6h.After reaction finishes,, obtain organic silicon emulsion with the Glacial acetic acid min. 99.5 neutralization.
The preparation of organosilicon-modified acrylic emulsion: 20g hydroxyl endblocked polydimethylsiloxane (molecular weight is 3500), 1g gamma-methyl allyl acyloxypropyl trimethoxysilane, 1g methyl ethylene diethoxy silane, 20g Bing Xisuandingzhi, 25g vinylformic acid, 1.2g sodium lauryl sulphate and 150g deionized water are joined in the four-necked bottle; Fully stir; Logical nitrogen 30min deoxygenation with after the warming-in-water to 70 ℃, adds the 0.6g Potassium Persulphate; Insulation 6h obtains organosilicon-modified acrylic emulsion.
The composition of waterborne organic silicon vinylformic acid self stratifying coating: organic silicon emulsion 15g, ACRYLIC EMULSION 50g, organosilicon-modified acrylic emulsion 5g, talcum powder 5g, red iron oxide 5g, ZX-I 0.3g, 5027 dispersion agent 0.3g, SURFYNOL TG 0.1g, NDW 0.1g, HX-89 0.1g, BCM sanitas 0.1g, propylene glycol monomethyl ether 2.0g, water 17g.
Waterborne organic silicon-acrylic acid self-stratifying coating prepares through following steps:
1) in joining the slurry container, adds 17g water and 0.3g 5027 dispersion agents, 0.1g SURFYNOL TG, 0.1g NDW, 0.1gKHX-89,0.1g BCM sanitas, 2.0g propylene glycol monomethyl ether, stir;
2) add 5g talcum powder and 5g red iron oxide in the compound that in step 1), obtains, stir;
3) step 2) grinding the mixture obtained to a fineness of 28 Jing, to obtain paste;
4) in the paint container, add mill base, 15g organic silicon emulsion, 5g organosilicon-modified acrylic emulsion, 50g B-96 ACRYLIC EMULSION, stir;
5) add the 0.3g ZX-I in the compound that in step 4), obtains, stir;
6) compound that step 5) is obtained filters, and the filtering larger particles obtains waterborne organic silicon-acrylic acid self-stratifying coating.
Prepared organosilicon-acrylic coating is cured, and with each layer silicone content in the X-gamma spectrometer test latex film cross section, the result is:
The latex film cross section number of plies 1 2 3 4 5 6 7 8 9 10
Silicon content (%) 4.7 4.5 4.4 4.2 3.5 3.1 2.5 1.9 1.4 1.2
Annotate: the latex film cross section is divided into 10 layers, and the 1st layer is upper surface, and 10 layers is lower surface.
Can find out that the content of different sectional position element silicons is different, explain that the coating of preparation has significantly from layer functions.
Embodiment 3
The preparation of organic silicon emulsion: in three mouthfuls of reaction flasks of the 500ml that stirring, reflux exchanger and constant pressure funnel are housed, add 100g water, 10g X 2073,0.5g sodium hydroxide, start stirring and make emulsifiers dissolve.Be warming up to 80 ℃, drip the mixture of 75g aminomethyl phenyl dimethoxy silane and 4.1g mercaptopropyl trimethoxysilane, 20min dropwises.Continue reaction 6h.After reaction finishes,, obtain organic silicon emulsion with the Glacial acetic acid min. 99.5 neutralization.
The preparation of organosilicon-modified acrylic emulsion: 15g hydroxyl endblocked polydimethylsiloxane (molecular weight is 2800), 1g gamma-methyl allyl acyloxypropyl triethoxyl silane, 10g methylacrylic acid, 20g methyl acrylate, 0.8g X 2073 and 120g deionized water are joined in the four-necked bottle; Fully stir; Logical nitrogen 30min deoxygenation with after the warming-in-water to 80 ℃, adds the 0.5g ammonium persulphate; Insulation 6h obtains organosilicon-modified acrylic emulsion.
The composition of waterborne organic silicon vinylformic acid self stratifying coating: organic silicon emulsion 12g, ACRYLIC EMULSION 50g, organosilicon-modified acrylic emulsion 7g, mica powder 6g, yellow oxide of iron 5g, ZX-I 0.5g, T-731 dispersion agent 0.1g, SURFYNOL TG 0.1g, NXZ 0.05g, HX-89 0.1g, BCM sanitas 0.1g, terepthaloyl moietie 0.8g, ethylene glycol ethyl ether 1.5g, water 11.75g.
The method of manufacture of waterborne organic silicon vinylformic acid self stratifying coating may further comprise the steps:
1) in joining the slurry container, adds 11.75g water and 0.1g T-731 dispersion agent, 0.1g SURFYNOL TG, 0.05g NXZ, 0.1g KHX-89,0.1g BCM sanitas, 0.8g terepthaloyl moietie, 1.5g ethylene glycol ethyl ether, stir;
2) add 6g mica powder and 5g yellow oxide of iron in the compound that in step (1), obtains, stir;
3) mixture that obtains in the step (2) is ground to fineness 29 μ m, obtains mill base;
4) in the paint container, add mill base, 12g organic silicon emulsion, 7g organosilicon-modified acrylic emulsion, 50gB-96 ACRYLIC EMULSION, stir;
5) add the 0.5g ZX-I in the compound that in step (4), obtains, stir;
6) compound that step (5) is obtained filters, and the filtering larger particles obtains waterborne organic silicon-acrylic acid self-stratifying coating.
Prepared organosilicon-acrylic coating is cured, and with each layer silicone content in the X-gamma spectrometer test latex film cross section, the result is:
The latex film cross section number of plies 1 2 3 4 5 6 7 8 9 10
Silicon content (%) 4.2 4.1 3.9 3.5 3.1 2.9 1.9 1.6 1.4 1.2
Annotate: latex film is divided into 10 layers, and the 1st layer is upper surface, and 10 layers is lower surface.
Can find out that the content of different sectional position element silicons is different, explain that the coating of preparation has significantly from layer functions.

Claims (2)

1. waterborne organic silicon-acrylic acid self-stratifying coating, it is characterized in that: the material of its following column weight amount per-cent is a raw material, through preparing product:
Organic silicon emulsion 10~15%,
ACRYLIC EMULSION 50~60%,
Organosilicon-modified acrylic emulsion 5~10%,
Filler 5~7%,
Pigment 5~7%,
Thickening material 0.2~0.5%,
Auxiliary agent 2~3%,
Water 10~20%;
Described organic silicon emulsion is to pass through RSiX 3With R 1R 2SiX 2Be 1: 10~20 in molar ratio, carry out the emulsion copolymerization reaction and obtain; Wherein: R, R 1, R 2Respectively be selected from a kind of in methyl, ethyl, propyl group, phenyl, vinyl, trifluoro propyl, aminopropyl, chloropropyl, epoxypropyl, hydroxypropyl, the mercapto propyl group, X is selected from oxyethyl group, methoxyl group;
Described organosilicon-modified acrylic emulsion is by functional group ZGK 5, an organosilane monomer, press mass ratio 10~20 with Acrylic Acid Monomer or acrylate monomer: 1: 20~40, get through letex polymerization; Wherein: vinylformic acid or acrylate monomer are one or more the mixture in TEB 3K, Jia Jibingxisuanyizhi, NSC 20956, methyl acrylate, ethyl propenoate, Bing Xisuandingzhi, vinylformic acid, the methylacrylic acid; The functional group ZGK 5 is ethenyl blocking YSR 3286 or hydroxyl endblocked polydimethylsiloxane, and an organosilane monomer is one or more the mixture in vinyltrimethoxy silane, vinyltriethoxysilane, methyl ethylene dimethoxy silane, methyl ethylene diethoxy silane, gamma-methyl allyl acyloxypropyl trimethoxysilane, gamma-methyl allyl acyloxypropyl triethoxyl silane, gamma-methyl allyl acyloxypropyl methyl dimethoxysilane, the gamma-methyl allyl acyloxypropyl methyldiethoxysilane;
Its preparation method is following steps:
1) in joining the slurry container, adds entry and auxiliary agent, stir;
2) add filler and pigment in the compound that in step 1), obtains, stir;
3) with step 2) in the mixture that obtains be ground to below the fineness 30 μ m, obtain mill base;
4) in the paint container, add mill base, organic silicon emulsion, organosilicon-modified acrylic emulsion, ACRYLIC EMULSION, stir;
5) add thickening material in the compound that in step 4), obtains, stir;
6) compound that step 5) is obtained filters, and obtains waterborne organic silicon-acrylic acid self-stratifying coating.
2. waterborne organic silicon-acrylic acid self-stratifying coating according to claim 1 is characterized in that:
Described filler is a kind of in light calcium carbonate, process white, talcum powder or the mica powder;
Described pigment is a kind of in iron oxide black, red iron oxide, yellow oxide of iron, the white titanium pigment;
Described thickening material is a kind of in Natvosol, the ZX-I;
Described auxiliary dosage is a coating weight 2~3%, wherein dispersion agent be coating weight 0.1~0.3%, wetting agent be coating weight 0.1~0.3%, skimmer be coating weight 0.01~0.1%, mould inhibitor be coating weight 0.1~0.5%, sanitas is that 0.1~0.3% and membrane-forming agent of coating weight is 1.5~2% of coating weight.
CN2009103113142A 2009-12-14 2009-12-14 Waterborne organic silicon-acrylic acid self-stratifying coating CN101724326B (en)

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