CN101314684A - Single-component fluorine-carbon-aluminum powder baking varnish, preparation, special thinning agent and use method thereof - Google Patents
Single-component fluorine-carbon-aluminum powder baking varnish, preparation, special thinning agent and use method thereof Download PDFInfo
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- CN101314684A CN101314684A CNA2008100678870A CN200810067887A CN101314684A CN 101314684 A CN101314684 A CN 101314684A CN A2008100678870 A CNA2008100678870 A CN A2008100678870A CN 200810067887 A CN200810067887 A CN 200810067887A CN 101314684 A CN101314684 A CN 101314684A
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Abstract
A single-component fluorocarbon aluminum paint comprises, by weight ratio, fluororesin 50 to 60, 20 percent CAB551-0.2 6 to 10, aminoresin 10 to 15, dispersant 0.2 to 0.6, acid catalyst 0.4 to 0.8, leveling agent 0.05 to 0.15, non-floating aluminum paste 5.5 to 8.5, pre-dispersant of the non-floating aluminum paste 5.5 to 8.5, and solvent 12 to 20, wherein the fluororesin is the polymer of tetrafluoroethylene/vinyl monomer and has a fluorine content of 35 to 40 percent; and the aminoresin is hexamethoxy methyl melamine resin with solid content equal to or larger than 98 percent. The method for producing the single-component fluorocarbon aluminum paint comprises the following steps: pre-dispersing the aluminum paste; stirring and mixing fluororesin, 20 percent CAB551-0.2 and aminoresin at low to middle speed, adding the dispersant, stirring at middle speed, adding the leveling agent, the acid catalyst and the solvent, and uniformly stirring at low to middle speed; adding the pre-dispersed aluminum paste under low-speed stirring, stirring and dispersing uniformly; and filtering to obtain the fluorocarbon aluminum paint. The invention further relates to a special diluting agent and the use method. The paint has a weathering resistance equal to or even larger than that of PVDF fluorocarbon paint, high hardness and greatly widened color selectivity, and can be re-coated only by baking at middle temperature without special treatment.
Description
Technical field
The present invention relates to a kind of fluorine-carbon-aluminum powder baking varnish and preparation method thereof, special diluting agent and using method, especially relate to a kind of middle temperature baking type single-component fluorine-carbon-aluminum powder baking varnish and preparation method thereof, special diluting agent and using method.
Background technology
Aluminum curtain wall plate for building, surface of steel plate protection and the decoration PVDF type fluorocarbon silver paints that adopt more, PVDF type fluorine carbon lacquer has extraordinary outdoor weatherability, and reach more than 20 years outdoor working life.But because PVDF type fluorine carbon lacquer need be at high bake more than 230 ℃, energy consumption height, production cost height.China has low temperature fluorocarbon baking varnish in several few in number in the patented technology now, all be that the employing trifluoro is resin and aminoresin or masked isocyanate resin crosslinks film-forming, efficiently solve the high energy consumption problem, but its weathering resistance and PVDF type fluorine carbon lacquer is compared and is still had a certain distance.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of middle temperature baking type single-component fluorine-carbon-aluminum powder baking varnish with good outdoor weatherability, and the present invention also provides its preparation method, special diluting agent and using method.
For addressing the above problem, the invention provides a kind of single-component fluorine-carbon-aluminum powder baking varnish, make by following components in weight percentage: fluoro-resin 50-60
20％CAB551-0.2 6-10
Aminoresin 10-15
Dispersion agent 0.2-0.6
Acid catalyst 0.4-0.8
Flow agent 0.05-0.15
Non-floating type aluminium-silver slurry 5.5-8.5
Non-floating type silver slurry presort powder 5.5-8.5
Solvent 12-20
Described fluoro-resin is the monomeric multipolymer of tetrafluoroethylene/ethylene base, and fluorine content is 35～40%, described aminoresin for to contain admittedly 〉=98% hexakis-methoxy methyl melamine resin.
Described non-floating type aluminium-silver slurry is 1: 1 with the weight proportion of presorting powder.
The powder of presorting of described non-floating type aluminium-silver slurry is dimethylbenzene or toluene; Described solvent is made up of the component of following weight proportion: methyl iso-butyl ketone (MIBK) or butylacetate 6-10
Propylene glycol methyl ether acetate or pimelinketone 6-10.
Described the ratio of each component is: fluoro-resin 57.0
20％CAB551-0.2 9.2
Aminoresin 12.5
Dispersion agent 0.4
Acid catalyst 0.5
Flow agent 0.1
Non-floating type aluminium-silver slurry 7.0
Dimethylbenzene 7.0
Methyl iso-butyl ketone (MIBK) 8.0
Propylene glycol methyl ether acetate 8.0.
Described fluoro-resin for contain 65% admittedly, the resin liquid of acid number≤4, hydroxyl value 55-65mgKOH/g.
Described dispersion agent is that the unsaturated polycarboxylic acid polymkeric substance of lower molecular weight adds organo-siloxane interpolymer solution; Described flow agent is polyethers or polyester modification polydimethylsiloxane solution.
Described acid catalyst is the solution of tosic acid amine salt.
The present invention also provides a kind of method for preparing single-component fluorine-carbon-aluminum powder baking varnish, comprises the steps:
Step 1. aluminium-silver slurry pre-dispersed: get the powder of presorting of aluminium-silver slurry, aluminium-silver slurry according to weight ratio, mix the back stirring at low speed to there not being the accumulative aluminum particle.
Step 2. get fluoro-resin, 20%CAB551-0.2, aminoresin in the component according to parts by weight, be low to moderate middling speed and mix, add dispersion agent again, middling speed stirred 5-10 minute, add flow agent, acid catalyst, solvent then by weight, be low to moderate middling speed and mix.
Step 3. pre-dispersed good aluminium-silver slurry in the above step 1 is joined under stirring at low speed in the paint vehicle that step 2 obtains, add and continue stirring at low speed 10-15 minute, filter and promptly obtain fluorine-carbon-aluminum powder baking varnish to being uniformly dispersed.
The present invention also provides a kind of thinner of single-component fluorine-carbon-aluminum powder baking varnish special use, is made up of the component of following weight proportion: dimethylbenzene 50
Methyl iso-butyl ketone (MIBK) 20
Propylene glycol methyl ether acetate 25
DBE 5
The present invention also provides a kind of method of using single-component fluorine-carbon-aluminum powder baking varnish and special diluting agent:
Step 1. described single-component fluorine-carbon-aluminum powder baking varnish and thinner are mixed by weight 1: 0.5～0.7;
Step 2. spraying application, sprayed and left standstill or air-dry 5-10 minute;
Step 3. 170 ℃ of bakings 20 minutes, promptly obtain the fluorine-carbon-aluminum powder baking varnish paint film.
Fluoro-resin in of the present invention in the temperature baking type single-component fluorine-carbon-aluminum powder lacquer component is the monomeric multipolymer of tetrafluoroethylene/ethylene base, with the tetrafluoroethylene is main raw material, has low-temperature bake fluorine carbon lacquer unexistent " no chlorine " feature in other trifluoro system, can form the tough of richer weather resistance films, keep beautiful application outward appearance for a long time, even under harsh environment, also show outstanding weathering resistance.
CAB551-0.2 can have compatibility preferably with above-mentioned fluoro-resin, its adding has not only improved the physical and mechanical properties of filming, as shock resistance and snappiness, the more important thing is that fluoro-resin-aminoresin system recoatability is poor, as coating surface not being carried out grinding process, then recoat time lacquer liquid can't wetting coating surface, and lacquer liquid can't levelling.The adding of CAB551-0.2 makes it have good recoatability, need not carry out surface treatment can levelling freely, ply adhesion reaches 1 grade during recoat.Its adding simultaneously helps aligning of silver powder, strengthens the sense of paint film metal.
Aminoresin is hexakis-methoxy methyl melamine resin, has good compatibility, and simultaneously because its functionality is 6, cross-linking reaction degree height, paint film have shock resistance, excellent flexibility and the anti-various chemical mediator of high rigidity, excellence.
Acid catalyst reduces storing temperature and shortens storing time.
Further in the technical scheme, solvent has adopted propylene glycol methyl ether acetate, does not adopt normally used ethyl cellosolve acetate, because the former environmental protection more.
Single-component fluorine-carbon-aluminum powder lacquer of the present invention can be applicable to aluminium sheet, electrolytic zinc-coated steel sheet and general steel plate etc., has following advantage:
1. middle temperature baking is enhanced productivity, and significantly cuts down the consumption of energy.
2. selected aminoresin and CAB have good weather, with the fluorocarbon baking varnish paint film cross-linking density height of fluoro-resin collocation preparation, meet or exceed the weathering resistance of PVDF type fluorine carbon lacquer.
3. the hardness height can reach more than the Chinese pencil 3H, still has excellent shock resistance and resistance to bend(ing) behind wear resistance, shock resistance, resistance to bend(ing) excellence, the especially recoat.
4. resistance to crocking excellence.
5. all can stand the toning that pigment slurry that 180 ℃ of pyritous weathering resistancies reach 5 grades all can be used for described fluorine-carbon-aluminum powder baking varnish, and comparing PVDF type fluorine carbon lacquer needs at high bake more than 230 ℃, and the color selectivity is widened greatly.
6. because the adding of CAB has changed workability, do not need to do any particular processing when making recoat, normal position does not need polishing, ply adhesion excellence.
Embodiment
Each component of the present invention all adopts currently available products, and each component that embodiment 1～3 selects and weight and part component model can be but listed product type in being not limited to show as shown in Table 1.
Table one
Wherein, fluoro-resin GK570 contains 65% admittedly, hydroxyl value 55-65mgKOH/g resin liquid, acid number 1.5-4.0; Join and CAB551-0.2 is dissolved into earlier 20% solution before the lacquer with butylacetate; Non-floating type aluminium-silver slurry also can adopt other commercially available various products, requires to select to get final product according to surface effect; Acid catalyst adopts the BYK450 of German BYK company, it is the solution of tosic acid amine salt, hexakis-methoxy methyl melamine resin system to low reactivity has the effect that reduces storing temperature and shorten storing time, than pure tosic acid, its influence to viscosity between the shelf lives obviously reduces, the 1.5-3 that can extend shelf life doubly can reduce 10-20 ℃ of storing temperature than other dead front type Catalyzed by p-Toluenesulfonic Acid agent (as sealing with morpholine or amino methyl propyl alcohol).
The dimethylbenzene of presorting powder as non-floating type aluminium-silver slurry can also adopt toluene.
As this white spirit, except methyl iso-butyl ketone (MIBK), propylene glycol methyl ether acetate, can also adopt butylacetate, pimelinketone respectively.
The solvent of CAB551-0.2 being dissolved into 20% solution can also be the mixture of methyl iso-butyl ketone (MIBK) or methyl iso-butyl ketone (MIBK) and butylacetate
Below in conjunction with specific embodiment technical scheme of the present invention is described.
Embodiment 1
Prepare fluorine-carbon-aluminum powder baking varnish master lacquer of the present invention:
Get each component according to " embodiment 1 " listed weight listed in the table one, the preparation method is according to following steps:
Step 1. aluminium-silver slurry pre-dispersed: the dimethylbenzene of getting aluminium-silver slurry and equivalent mixes, and stirring at low speed is to there not being the accumulative aluminum particle, and is standby;
Step 2. get fluoro-resin, 20%CAB551-0.2, aminoresin in the component according to weight proportion, being low to moderate middling speed mixes, add dispersion agent again, middling speed stirred 5-10 minute, add flow agent, methyl iso-butyl ketone (MIBK), propylene glycol methyl ether acetate, acid catalyst then by weight, be low to moderate middling speed and mix.
Step 3. pre-dispersed good aluminium-silver slurry in the above step 1 is joined under stirring at low speed in the paint vehicle that step 2 obtains, add and continue stirring at low speed 10-15 minute to being uniformly dispersed, 100 mesh filter screens filter and promptly obtain fluorine-carbon-aluminum powder baking varnish.
Prepare supporting thinner: according to following weight proportion:
Dimethylbenzene 50
Methyl iso-butyl ketone (MIBK) 20
Propylene glycol methyl ether acetate 25
DBE 5
Above-mentioned four kinds of solvents are added in the production container, and stirring at low speed 5-10 minute, 400 mesh filter screens filtered, and packed, and promptly obtained the diluent of described fluorine-carbon-aluminum powder baking varnish.
Fluorine-carbon-aluminum powder baking varnish of the present invention and thinner were mixed by weight 1: 0.7, carry out spraying application then, sprayed and left standstill or air-dry 5-10 minute, 170 ℃ of bakings 20 minutes, promptly obtain the fluorine-carbon-aluminum powder baking varnish paint film then.Traditional performance detected result (build 20-26 μ m, the total build 35-45 of recoat μ m) is shown in " embodiment 1 " corresponding data in the table two.
Embodiment 2
With " embodiment 2 " each composition weight listed in the table one, repeat embodiment 1 described method (only each composition weight changes), prepare fluorine-carbon-aluminum powder baking varnish master lacquer; The component, proportioning and the preparation method that repeat thinner among the embodiment 1 prepare thinner; To lead lacquer and thinner mixed according to 1: 0.6, then according to embodiment 1 described method construct and drying after obtain the fluorine-carbon-aluminum powder baking varnish paint film, traditional performance detected result (build is with embodiment 1) is shown in " embodiment 2 " corresponding data in the table two.
Embodiment 3
With " embodiment 3 " each composition weight listed in the table one, repeat embodiment 1 described method (only each composition weight changes), prepare fluorine-carbon-aluminum powder baking varnish master lacquer; The component, proportioning and the preparation method that repeat thinner among the embodiment 1 prepare thinner; To lead lacquer and thinner mixes according to 10.5, then according to embodiment 1 described method construct and drying after obtain the fluorine-carbon-aluminum powder baking varnish paint film, traditional performance detected result (build is with embodiment 1) is shown in " embodiment 3 " corresponding data in the table two.
Table two
| Sequence number | Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| 1 | Sticking power | 1 grade | 1 grade | 1 grade |
| 2 | Hardness (Chinese pencil) | 3H | 3H | 3H |
| 3 | Snappiness (≤mm) | 1 | 1 | 1 |
| 4 | Shock resistance (〉=cm) | Positive and negative 50 | Positive and negative 50 | Positive and negative 50 |
| 5 | MEK wiping (100 times) | Coating surface slightly abrades, and is not show-through | Coating surface slightly abrades, and is not show-through | Coating surface slightly abrades, and is not show-through |
| 6 | Resistance to crocking (red symbol pen) | Leave no trace | Leave no trace | Leave no trace |
| 7 | Recoatability (two coating film total thickness are 35-45 μ m) | Recoat is accessible, 1 grade of ply adhesion, multiple layer snappiness≤2mm, square impact 〉=50cm | Recoat is accessible, 1 grade of ply adhesion, multiple layer snappiness≤2mm, square impact 〉=50cm | Recoat is accessible, 1 grade of ply adhesion, multiple layer snappiness≤2mm, square impact 〉=50cm |
| 8 | The artificial weathering ageing resistance | 5000 hours non-foaming, do not peel off, flawless.Efflorescence≤1 grade variable color≤2 grades loss of gloss≤2 grade | 5000 hours non-foaming, do not peel off, flawless.Efflorescence≤1 grade variable color≤2 grades loss of gloss≤2 grade | 5000 hours non-foaming, do not peel off, flawless.Efflorescence≤1 grade variable color≤2 grades loss of gloss≤2 grade |
Annotate: in the table two, when being the artificial weathering ageing resistance and testing, coating surface is with similar varnish Lacquer finish.
Claims (10)
1. single-component fluorine-carbon-aluminum powder baking varnish, make by following components in weight percentage:
Fluoro-resin 50-60
20％CAB551-0.2 6-10
Aminoresin 10-15
Dispersion agent 0.2-0.6
Acid catalyst 0.4-0.8
Flow agent 0.05-0.15
Non-floating type aluminium-silver slurry 5.5-8.5
Non-floating type aluminium-silver slurry presort powder 5.5-8.5
Solvent 12-20;
Described fluoro-resin is the monomeric multipolymer of tetrafluoroethylene/ethylene base, and fluorine content is 35～40%, described aminoresin for to contain admittedly 〉=98% hexakis-methoxy methyl melamine resin.
2. single-component fluorine-carbon-aluminum powder baking varnish according to claim 1 is characterized in that, described non-floating type aluminium-silver slurry is 1: 1 with the weight proportion of presorting powder.
3. single-component fluorine-carbon-aluminum powder baking varnish according to claim 1 is characterized in that, the powder of presorting of described non-floating type aluminium-silver slurry is dimethylbenzene or toluene; Described solvent is made up of the component of following weight proportion:
Methyl iso-butyl ketone (MIBK) or butylacetate 6-10
Propylene glycol methyl ether acetate or pimelinketone 6-10.
4. single-component fluorine-carbon-aluminum powder baking varnish according to claim 3 is characterized in that, described the ratio of each component is:
Fluoro-resin 57.0
20％CAB551-0.2 9.2
Aminoresin 12.5
Dispersion agent 0.4
Acid catalyst 0.5
Flow agent 0.1
Non-floating type aluminium-silver slurry 7.0
Dimethylbenzene 7.0
Methyl iso-butyl ketone (MIBK) 8.0
Propylene glycol methyl ether acetate 8.0.
5. according to each described single-component fluorine-carbon-aluminum powder baking varnish of claim 1～4, it is characterized in that, described fluoro-resin for contain 65% admittedly, the resin liquid of acid number≤4, hydroxyl value 55-65mgKOH/g.
6. according to each described single-component fluorine-carbon-aluminum powder baking varnish of claim 1～4, it is characterized in that described dispersion agent is that the unsaturated polycarboxylic acid polymkeric substance of lower molecular weight adds organo-siloxane interpolymer solution; Described flow agent is polyethers or polyester modification polydimethylsiloxane solution.
7. according to each described single-component fluorine-carbon-aluminum powder baking varnish of claim 1～4, it is characterized in that described acid catalyst is the solution of tosic acid amine salt.
8. a method for preparing the described single-component fluorine-carbon-aluminum powder baking varnish of above each claim comprises the steps:
Step 1. aluminium-silver slurry pre-dispersed: get the powder of presorting of non-floating type aluminium-silver slurry, non-floating type aluminium-silver slurry according to weight ratio, mix the back stirring at low speed to there not being the accumulative aluminum particle;
Step 2. get fluoro-resin, 20%CAB551-0.2, aminoresin in the component according to parts by weight, be low to moderate middling speed and mix, add dispersion agent again, middling speed stirred 5-10 minute, add flow agent, acid catalyst, solvent then by weight, be low to moderate middling speed and mix;
Step 3. pre-dispersed good aluminium-silver slurry in the described step 1 is joined under stirring at low speed in the paint vehicle that step 2 obtains, add and continue stirring at low speed 10-15 minute, filter and promptly obtain described single-component fluorine-carbon-aluminum powder baking varnish to being uniformly dispersed.
9. the thinner of a single-component fluorine-carbon-aluminum powder baking varnish special use, form by the component of following weight proportion:
Dimethylbenzene 50
Methyl iso-butyl ketone (MIBK) 20
Propylene glycol methyl ether acetate 25
DBE 5。
10. method of using single-component fluorine-carbon-aluminum powder baking varnish and the described special diluting agent of claim 9:
Step 1. described single-component fluorine-carbon-aluminum powder baking varnish and thinner are mixed by weight 1: 0.5～0.7;
Step 2. spraying application, sprayed and left standstill or air-dry 5-10 minute;
Step 3. 170 ℃ of bakings 20 minutes, promptly obtain the fluorine-carbon-aluminum powder baking varnish paint film.
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