Background technology
Along with strict day by day with environmental regulation of improving constantly of people's environmental consciousness, environmental protection coating material will become the leading role in 21 century world's coating market.Solvent based coating easily produces harm to human and environment owing to contain higher organic solvent in construction and application process, coatings industry has been very urgent to the conversion of " green industry ".Water-borne coatings is as a kind of product of coating; its solvent is a water, does not have inflammable and explosive hidden danger, owing to safety non-toxic, economize on resources, protect environment; become one of main direction of coating development, water-borne coatings will fully develop talents in the future development of coating industry.
At present, the water-borne coatings product of using comparative maturity on the market also is a covil construction coating, the water-borne coatings product of industrial production scope all can run into a following industry difficult problem: 1. product is very responsive to temperature and humidity, some water-borne coatings only suits to use in the fixed temperature and humidity spray room of special use, and construction adaptability is poor.2. when temperature step-down or humidity obviously increased, moisture content was difficult to volatilization, caused construction significant prolongation at interval, influenced job schedule.3 run into wet bumping when wetting technology, can produce serious sagging, can't reach ideal production efficiency.
Summary of the invention
The purpose of this invention is to provide a kind of water-based decorative paint that is used for metallic substance.This water-based decorative paint has water-dilutable, easy construction, coating and possesses good physicochemical performance.
Another object of the present invention provides the preparation method of above-mentioned water-based decorative paint.
First purpose of the present invention realizes by following technical measures: a kind of water-based decorative paint that is used for metallic substance comprises the component of following weight part:
Water-base resin 40~50%
Methyl-etherified aminoresin 7~10%
Dispersion agent 3~5%
Pigment 23~28%
Moistening flatting agent 0.5~1%
Thixotropic agent 0.5~1%
Defoamer 0.5~1%
Anti-flash corrosion inhibitor 0.5~1%
Film coalescence aid 5~10%
Deionized water 10~20%.
Water-base resin of the present invention is meant aqueous acrylic emulsion, as corresponding products such as German BASF AG, Bayer A.Gs.
Methyl-etherified aminoresin of the present invention is meant water-soluble HMMM aminoresin, as U.S. hydrogen spy's 303,325; Corresponding products such as 717,747 of promise reputation.
Dispersion agent of the present invention is meant polymer block dispersion agent, is BYK191, BYK190, corresponding products such as 750 as model.
It is product or their mixtures such as BYK346, BYK348, TEGO245 that flow agent of the present invention adopts as model.
Thixotropic agent of the present invention is meant that urea is polymer-modified, is corresponding products such as BYK425 or BYK420 as model.
It is product such as BYK024, BYK029, TEGO825 or their mixture etc. that defoamer of the present invention adopts as model.
Anti-flash corrosion inhibitor of the present invention is meant the solution that delays corrosion of metal, is corresponding products such as RAYBO60,794S as model.
Film coalescence aid of the present invention is meant the auxiliary agent that helps coating film, is corresponding products such as TMP-95, TEXANOL as model.
Second purpose of the present invention realizes by following technical measures: a kind of above-mentioned preparation method who is used for the water-based decorative paint of metallic substance, and it may further comprise the steps:
(1) takes by weighing each component by proportioning, then water-base resin is partly added in the steel basin, add dispersion agent, add pigment while stirring, be uniformly dispersed then;
(2) with finely dispersed material in the step (1) levigate after, add clout, stir, adjust pH value, leave standstill, filter packing.
Described step (1) material jitter time is 20 minutes, and temperature is controlled at below 50 ℃.
In the described step (2) material adopt sand milling levigate to the material fineness below 15um; Material after levigate stirs; The adjustment pH value is 8.0-8.5; Time of repose was at least 20-30 minute, adopted the 250-350 eye mesh screen during filtration.
The present invention compared with prior art has following beneficial effect:
(1) the water-based decorative paint outward appearance that is used for metallic substance provided by the invention is mobile thick liquid, and solid content is 50-60%, and room temperature lucifuge period of storage can reach 1 year; Can solidify in 15~20 minutes under 140 ℃~160 ℃ behind the spraying application, the paint film after the curing has good gloss and hardness, and has performances such as good anti-neutral salt spray and anti scuffing.
(2) the present invention can be used for the spraying of multiple metal material surfaces such as stainless steel, carbon steel and alloy.Can adopt full-automatic electrostatic coating technology or 2C1B technology (is the wet application of wet shot, the technology that adopts twice spraying once to toast) spray, reach the requirement of full-automatic electrostatic coating technology or 2C1B technology, and solved water-borne coatings exists in the prior art sag prevention and technical problems such as levelling, aluminium-silver slurry color developing and storage characteristics.
(3) the coating provided by the invention error that variation causes to humiture is very little, can solve as long as suitably adjust working viscosity; Can both well satisfy for electrostatic spraying and the wet processing condition that wet of bumping, can comply with the running of streamline high-level efficiency.
Embodiment
The present invention will be described to enumerate a part of specific embodiment below, is necessary to be pointed out that at this following specific embodiment only is used for that the invention will be further described, does not represent limiting the scope of the invention.Some nonessential modifications that other people make according to the present invention and adjustment still belong to protection scope of the present invention.
The component of the water-based decorative paint that is used for metallic substance of embodiment 1~4 is referring to table one, the preparation method is as follows: aqueous acrylic emulsion is partly added in the steel basin, add dispersion agent, add pigment in the whipping process, disperseed 20 minutes, temperature is controlled at below 50 degree.The sand milling fineness is to 15um.Add clout, stir.Adjust pH value to 8.0-8.5.Leave standstill that 300 orders filter and package after 30 minutes.
Wherein, aqueous acrylic emulsion adopts as corresponding products such as German BASF AG, Bayer A.G.
Water-soluble HMMM aminoresin adopts as U.S. hydrogen spy's 303,325; Corresponding products such as 717,747 of promise reputation.
Dispersion agent adopts polymer block dispersion agent, as corresponding products such as the BYK191 of Bi Ke company, BYK190, TEGO companies 750.
Flow agent adopts BYK346, BYK348, TEGO245 or their mixture etc.
Thixotropic agent adopts urea polymer-modified, as corresponding products such as BYK425 of Bi Ke company or BYK420.
Defoamer adopts BYK024, BYK029, TEGO825 or their mixture etc.
Anti-flash corrosion inhibitor is meant the solution that delays corrosion of metal, as corresponding products such as RAYBO60,794S.
Film coalescence aid is meant the auxiliary agent that helps coating film, as corresponding products such as TMP-95, TEXANOL.
Table one
Component |
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
Embodiment 4 |
Aqueous acrylic emulsion |
41.0wt%? |
42.0wt%? |
46.7wt%? |
41.4wt%? |
Water-soluble HMMM aminoresin |
7.0wt%? |
7.9wt%? |
7.2wt%? |
9.0wt%? |
Dispersion agent |
4.0wt%? |
5.0wt%? |
4.0wt%? |
4.5wt%? |
Pigment |
24.9wt%? |
25.0wt%? |
23.0wt%? |
27wt%? |
Flow agent |
0.7wt%? |
0.7wt%? |
0.7wt%? |
0.7wt%? |
Defoamer |
0.6wt%? |
0.6wt%? |
0.6wt%? |
0.6wt%? |
Thixotropic agent |
0.8wt%? |
0.8wt%? |
0.8wt%? |
0.8wt%? |
Anti-flash corrosion inhibitor |
0.5wt%? |
0.5wt%? |
0.5wt%? |
0.5wt%? |
Film coalescence aid |
8.5wt%? |
7.5wt%? |
6.5wt%? |
5.5wt%? |
Deionized water |
12.0wt%? |
10.0wt%? |
10.0wt%? |
10.0wt%? |
The water-based decorative paint of the foregoing description 1~4 is sprayed on the pretreated tinplate 140 ℃~160 ℃ following 15~20 minutes baking-curings after with the deionized water dilution.Solidify the back effect referring to table two:
Table two
Performance |
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
Embodiment 4 |
Testing method |
Hardness |
?2H? |
?2H? |
?3H? |
?3H? |
GB/T?6739-96? |
Shock strength (kgcm) |
50? |
45? |
45? |
40? |
GB/T1732-93? |
Sticking power (level) |
1? |
1? |
1? |
2? |
GB1720? |
Snappiness |
1mm? |
1mm? |
1mm? |
1mm? |
GB/T1731? |
Anti-5% salt solution (240h) |
No abnormal |
No abnormal |
No abnormal |
No abnormal |
/? |
Water tolerance (soaking 72h) |
No abnormal |
No abnormal |
No abnormal |
No abnormal |
/? |