CN101386771B - Elastic polyurethane silver paint and preparation method and use method thereof - Google Patents
Elastic polyurethane silver paint and preparation method and use method thereof Download PDFInfo
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- CN101386771B CN101386771B CN2008102170618A CN200810217061A CN101386771B CN 101386771 B CN101386771 B CN 101386771B CN 2008102170618 A CN2008102170618 A CN 2008102170618A CN 200810217061 A CN200810217061 A CN 200810217061A CN 101386771 B CN101386771 B CN 101386771B
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Abstract
The invention discloses elastic polyurethane silver paint. Main paint of the elastic polyurethane silver paint is prepared from compositions according to the following weight proportion: 65 to 85 percent of a hydroxy acrylic acid resin, 2 to 5 percent of 20 percent CAB381-0.5, 0.3 to 0.5 percent of a dispersant, 0.4 to 0.6 percent of an anti-settling agent, 0.3 to 0.5 percent of a flatting agent,0.4 to 0.8 percent of wax powder, 7 to 10 percent of non-leafing aluminum paste, 7 to 10 percent of dimethylbenzene, and 15 to 22 percent of mixed solvent; a curing agent of the elastic polyurethane silver paint is formed by mixing compositions according to the following weight percent: 75 percent of elastic HDI curing agent, and 25 percent of absolute butyl acetate; and the weight proportion of the main paint to the curing agent is calculated based on a hydroxyl value of acrylic acid resin and the NCO content of the curing agent, and OH/NCO is equal to 1 to (1.05-1.15). The elastic polyurethane silver paint has excellent weather resistance, stain resistance, scrubbing resistance and decoration property, is a coating variety with excellent performance which is second only to fluorocarbon paint, also has good elasticity at normal temperature and low temperature, can resist fine cracks, can prevent cracks on the surface of a coating caused by the fine cracks of a putty layer, and can also be used as finish for a complete anti-cracking aluminum-imitation plate coating system that flexible putty is matched with an elastic primer and an elastic middle coating.
Description
Technical field
The present invention relates to a kind of used for building exterior wall bicomponent elastic polyurethane silver paint and preparation method thereof and using method.
Background technology
In recent years, the imitative aluminium sheet application of exterior wall was increasingly extensive, and decorative effect is similar to aluminium sheet, and cost only is about 20% of an aluminium sheet but, and selected coating is generally cold cross-linking type fluorocarbon silver paint and polyurethane silver paint.But the imitative aluminium sheet coating cracking phenomenon that a variety of causes causes is perplexing research and development, production and construction enterprises always, in order to address this problem, the main method of taking at present is to adopt two-pack flexible putty and various fibrous mesh cloth to prevent the putty layer cracking, obtained effect preferably, but because putty layer is generally thicker, cause the reason more complicated of cracking phenomena, be difficult to avoid fully.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of cold cross-linking type elastic polyurethane silver paint and preparation method thereof and using method.This elastic polyurethane silver paint both can prevent the coatingsurface crackle that the putty layer micro-cracks causes; Also can be used as finish paint, be used for cooperating the imitative aluminium sheet finishing system of thorough anticracking of elasticity priming paint and elasticity intermediate layer paint with flexible putty.
For addressing the above problem, the invention provides a kind of elastic polyurethane silver paint, its main lacquer is made by the component of following weight proportion:
Hydroxylated acrylic resin 65-85
20％CAB381-0.5 2-5
Dispersion agent 0.3-0.5
Anti-settling agent 0.4-0.6
Flow agent 0.3-0.5
Wax powder 0.4-0.8
Non-floating type aluminium-silver slurry 7-10
Dimethylbenzene 7-10
Mixed solvent 15-22;
The solidifying agent of described elastic polyurethane silver paint is mixed by the component of following weight proportion:
Elasticity HDI solidifying agent 75
Anhydrous acetic acid butyl ester 25;
And the weight proportion of described main lacquer and solidifying agent is got OH/NCO=1: (1.05-1.15) according to the NCO cubage of employed acrylic resin hydroxyl value and solidifying agent.
Described non-floating type aluminium-silver slurry and dimethylbenzene weight proportion are 1: 1.
Described main each composition weight proportioning of lacquer is:
Hydroxylated acrylic resin 75
20％CAB381-0.5 4
Dispersion agent 0.4
Anti-settling agent 0.5
Flow agent 0.4
Wax powder 0.5
Non-floating type aluminium-silver slurry 8.5
Dimethylbenzene 8.5
Mixed solvent is: butylacetate 10
Propylene glycol methyl ether acetate 8,
And the weight proportion of described main lacquer and solidifying agent is got OH/NCO=1: 1.1 according to the NCO cubage of employed acrylic resin hydroxyl value and solidifying agent.
Described elasticity HDI solidifying agent is the E405-80T of company of Asahi Chemical Industry;
Described 20%CAB381-0.5, the concentration expressed in percentage by weight that is CAB381-0.5 is the solution of 20% butylacetate.
Described dispersion agent is that the unsaturated polycarboxylic acid polymkeric substance of lower molecular weight adds organo-siloxane interpolymer solution; Described flow agent is polyether-modified polydimethylsiloxane solution; Described anti-settling agent is a polyamide wax pulp.
Described wax powder is a polyethylene wax.
Described mixed solvent is at least two kinds a mixture in butylacetate, methyl iso-butyl ketone (MIBK), pimelinketone, ethyl cellosolve acetate, propylene glycol methyl ether acetate, the valeric acid dimethyl ester.
The present invention also provides the preparation method of described elastic polyurethane silver paint master lacquer, comprises the steps:
Step 1: aluminium-silver slurry pre-dispersed: get equivalent aluminium-silver slurry, dimethylbenzene according to weight ratio, mix the back stirring at low speed to there not being the accumulative aluminum particle;
Step 2: get Hydroxylated acrylic resin, 20%CAB381-0.5 in the component according to weight proportion and be low to moderate middling speed and mix, add dispersion agent again, middling speed stirs after 5-10 minute and adds anti-settling agent, add high speed dispersion 5-10 minute to fineness≤25 μ m, add the wax powder then, added high speed dispersion 15 minutes, and added flow agent, solvent at last 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 elastic polyurethane silver paint master lacquer to being uniformly dispersed.
The present invention also provides a kind of method of using described elastic polyurethane silver paint: at first elastic polyurethane silver paint is mixed by proportioning with solidifying agent, and then by the main 40-60% adding diluent that coats with lacquer weight, carry out spraying application after mixing, sprayed seasoning; Wherein, described diluent is mixed by the component of following weight proportion:
Dimethylbenzene 50
Propylene glycol methyl ether acetate 25
DBE 25。
The acrylic resin that elastic polyurethane silver paint of the present invention adopts is the Hydroxylated acrylic resin with good weatherability properties, form good the filming of weathering resistance with the crosslinked film forming of the solidifying agent of weathering resistance, can keep beautiful application outward appearance for a long time, even under harsh environment, also show good weathering resistance, also have excellent anti-stain characteristic and abrasion resistance, excellent decorate properties etc. are the coating varieties that is only second to the excellent performance of fluorine carbon lacquer.Described solidifying agent E405-80T is the HDI adducts, not only has good elasticity under the normal temperature, even its unit elongation also reaches more than 100% under-10 ℃ low temperature, therefore, this lacquer has good normal temperature and low temperature elasticity, hair line can be resisted, the coatingsurface crackle that the putty layer micro-cracks causes can be prevented; Also can be used as finish paint, be used for cooperating the imitative aluminium sheet finishing system of thorough anticracking of elasticity priming paint and elasticity intermediate layer paint with flexible putty.In addition, elastic polyurethane silver paint Air drying of the present invention, but site operation.
Embodiment
Each component of the present invention all adopts currently available products, and described CAB is a cellulose acetate butyrate, and 20%CAB381-0.5 is the solution of the butylacetate of CAB381-0.5, and is fine with the acrylic resin intermiscibility.Elasticity HDI solidifying agent is the adducts of hexamethylene diisocyanate (HDI), selects the E405-80T of company of Asahi Chemical Industry for use, and its NCO content is 7.1%, and has good normal temperature and low temperature elasticity; Solvent in the main lacquer is selected the strong ketone of acrylic resin and CAB solvency power, ester class, multifunctional ester class etc., as butylacetate, methyl iso-butyl ketone (MIBK), pimelinketone, ethyl cellosolve acetate, propylene glycol methyl ether acetate, valeric acid dimethyl ester and composition thereof, the mixture of preferred butylacetate of this embodiment and propylene glycol methyl ether acetate.
Component that embodiment 1～3 selects and weight part and each component model be as shown in Table 1:
Table one
Embodiment 1
The main lacquer of preparation polyurethane silver paint of the present invention:
Get each component according to weight shown in the embodiment in the table one 1, the preparation method is according to following steps:
Step 1: aluminium-silver slurry pre-dispersed: get the aluminium-silver slurry in the prescription and the dimethylbenzene of equivalent and mix, stirring at low speed is to there not being the accumulative aluminum particle, and is standby;
Step 2: get acrylic resin, 20%CAB381-0.5 in the component according to weight proportion in the prescription, being low to moderate middling speed mixes, add dispersion agent again, middling speed stirred 5-10 minute, add anti-settling agent and high speed dispersion 5-10 minute then by weight to fineness≤25 μ m, under stirring at low speed, add the wax powder again, add high speed dispersion 15 minutes, add flow agent and whole residual solvent then and be low to moderate middling speed and mix to fineness≤25 μ m;
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 elastic polyurethane silver paint master lacquer.
The solidifying agent of preparation polyurethane silver paint of the present invention: by weight proportion in the prescription that E405-80T and anhydrous acetic acid butyl ester thorough mixing is even, filter and package with 200 mesh filter screens and promptly to get the elastic polyurethane silver paint solidifying agent.
Prepare supporting thinner:
Dimethylbenzene 50
Propylene glycol methyl ether acetate 25
DBE 25，
Wherein, described DBE is the mixed solvent of high boiling point diester.According to above weight proportion, above-mentioned three kinds of solvents are added in the production container, stirring at low speed 5-10 minute, 400 mesh filter screens filtered and packaged the diluent that promptly obtains described urethane aluminum powder baking varnish.
Polyurethane silver paint master lacquer of the present invention, solidifying agent and thinner are mixed by weight 97.4:31.7:40, carry out spraying application then, sprayed seasoning and promptly obtained the polyurethane silver paint paint film, did solid work complete drying 7 days under the normal temperature 24 hours.Performance test results (dry coating film thickness is (1 ± 0.2) mm during the test extensibility, and all the other are by relevant criterion) is shown in embodiment 1 corresponding data among the table two testing performance index result.
Embodiment 2
According to each composition weight in table one illustrated embodiment 2, repeat embodiment 1 described method, prepare elastic polyurethane and coat with lacquer main lacquer, solidifying agent and thinner.Coat with lacquer according to main: solidifying agent: thinner=115.3:37.7:60 mixes and carries out spraying application then, has sprayed seasoning and has promptly obtained the polyurethane silver paint paint film, does solid work complete drying 7 days under the normal temperature 24 hours.Performance test results (dry coating film thickness is (1 ± 0.2) mm during the test extensibility, and all the other are by relevant criterion) is shown in embodiment 2 corresponding datas among the testing performance index result in the table two.
Embodiment 3
According to each composition weight branch among the embodiment 3, repeat embodiment 1 described method, prepare elastic polyurethane and coat with lacquer main lacquer, solidifying agent and thinner.Coat with lacquer according to main: solidifying agent: thinner=134.4:54.9:80 mixes and carries out spraying application then, has sprayed seasoning and has promptly obtained the polyurethane silver paint paint film, does solid work complete drying 7 days under the normal temperature 24 hours.Performance test results (dry coating film thickness is (1 ± 0.2) mm during the test extensibility, and all the other are by relevant criterion) is shown in embodiment 3 corresponding datas in the table two technical indicator test result.
Table two
Annotate: the similar varnish Lacquer finish of weathering resistance, acid resistance and mortar resistance Test Application.
Claims (9)
1. elastic polyurethane silver paint, its main lacquer is made by the component of following weight proportion:
Hydroxylated acrylic resin 65-85
20％CAB381-0.5 2-5
Dispersion agent 0.3-0.5
Anti-settling agent 0.4-0.6
Flow agent 0.3-0.5
Wax powder 0.4-0.8
Non-floating type aluminium-silver slurry 7-10
Dimethylbenzene 7-10
Mixed solvent 15-22;
The solidifying agent of described elastic polyurethane silver paint is mixed by the component of following weight proportion:
Elasticity HDI solidifying agent 75
Anhydrous acetic acid butyl ester 25;
And the weight proportion of described main lacquer and solidifying agent is got OH/NCO=1: (1.05-1.15) according to the NCO cubage of employed acrylic resin hydroxyl value and solidifying agent;
Described mixed solvent is at least two kinds a mixture in butylacetate, methyl iso-butyl ketone (MIBK), pimelinketone, ethyl cellosolve acetate, propylene glycol methyl ether acetate, the valeric acid dimethyl ester.
2. elastic polyurethane silver paint according to claim 1 is characterized in that, described non-floating type aluminium-silver slurry and dimethylbenzene weight proportion are 1: 1.
3. elastic polyurethane silver paint according to claim 1 is characterized in that, described main each composition weight proportioning of lacquer is:
Hydroxylated acrylic resin 75
20％CAB381-0.5 4
Dispersion agent 0.4
Anti-settling agent 0.5
Flow agent 0.4
Wax powder 0.5
Non-floating type aluminium-silver slurry 8.5
Dimethylbenzene 8.5
Mixed solvent is: butylacetate 10
Propylene glycol methyl ether acetate 8,
And the weight proportion of described main lacquer and solidifying agent is got OH/NCO=1: 1.1 according to the NCO cubage of employed acrylic resin hydroxyl value and solidifying agent.
4. according to each described elastic polyurethane silver paint of claim 1～3, it is characterized in that described elasticity HDI solidifying agent is the E405-80T of company of Asahi Chemical Industry;
5. according to each described elastic polyurethane silver paint of claim 1～3, it is characterized in that, described 20%CAB381-0.5, the concentration expressed in percentage by weight that is CAB381-0.5 is the solution of 20% butylacetate.
6. according to each described elastic polyurethane silver paint of claim 1～3, 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 polyether-modified polydimethylsiloxane solution; Described anti-settling agent is a polyamide wax pulp.
7. according to each described elastic polyurethane silver paint of claim 1～3, it is characterized in that described wax powder is a polyethylene wax.
8. the preparation method of each described elastic polyurethane silver paint master lacquer of claim 1～3 comprises the steps:
Step 1: aluminium-silver slurry pre-dispersed: get equivalent aluminium-silver slurry, dimethylbenzene according to weight ratio, mix the back stirring at low speed to there not being the accumulative aluminum particle;
Step 2: get Hydroxylated acrylic resin, 20%CAB381-0.5 in the component according to weight proportion and be low to moderate middling speed and mix, add dispersion agent again, middling speed stirs after 5-10 minute and adds anti-settling agent, add high speed dispersion 5-10 minute to fineness≤25 μ m, add the wax powder then, added high speed dispersion 15 minutes, and added flow agent, solvent at last 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 elastic polyurethane silver paint master lacquer to being uniformly dispersed.
9. method of using the described elastic polyurethane silver paint of claim 1: at first elastic polyurethane silver paint is mixed by proportioning with solidifying agent, and then by the main 40-60% adding diluent that coats with lacquer weight, carry out spraying application after mixing, sprayed seasoning; Wherein, described diluent is mixed by the component of following weight proportion:
Dimethylbenzene 50
Propylene glycol methyl ether acetate 25
DBE 25。
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