CN115895359A - Water-based acrylic amino baking varnish coating and preparation method thereof - Google Patents
Water-based acrylic amino baking varnish coating and preparation method thereof Download PDFInfo
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- CN115895359A CN115895359A CN202210791441.2A CN202210791441A CN115895359A CN 115895359 A CN115895359 A CN 115895359A CN 202210791441 A CN202210791441 A CN 202210791441A CN 115895359 A CN115895359 A CN 115895359A
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Abstract
The invention discloses a water-based acrylic amino baking varnish coating which comprises the following components in percentage by mass: 45-55% of acrylic emulsion, 5-10% of water-based acrylic baking varnish resin, 0.2-0.4% of defoaming agent, 0.1-0.2% of flatting agent, 0.2-0.4% of wetting dispersant, 0.5-1% of organic antirust agent, 1-2% of amino resin, 0.5-1% of cross-linking agent, 0.3-0.5% of dimethylethanolamine, 5-10% of pigment, 10-15% of filler, 0.3-0.5% of thickening agent and 20-25% of deionized water. The aqueous acrylic acid amino baking varnish coating uses the organic antirust auxiliary agent, introduces the oxazoline group polymer cross-linking agent, improves the gloss of a paint film, increases the salt spray resistance of the paint film, and further improves the water resistance, solvent resistance, heat resistance, coating strength and other properties of the paint film due to the cross-linking reaction of the cross-linking agent and carboxyl in the aqueous acrylic acid baking varnish at normal temperature.
Description
Technical Field
The invention relates to the technical field of coatings, and relates to a water-based acrylic amino baking varnish coating and a preparation method thereof.
Background
Since metal corrosion is an important cause of damage to metal materials, corrosion prevention is an essential means for protecting metal materials. The most common method adopted for metal corrosion is a coating method, namely, a coating paint film is covered on the surface of metal, so that the metal and a medium cannot be in direct contact, and the anti-corrosion effect is achieved.
The amino baking varnish metal anticorrosive paint is a common industrial paint, integrates decoration and corrosion prevention, is mainly applied to the surface of high-grade metal such as automobiles and the like as finish paint, and has high requirements on various properties of a paint film. The traditional oily amino baking paint is eliminated by society gradually because a large amount of organic gas is released in the using process and harms the environment and human health, and the water-based amino baking paint gradually becomes the research focus in the field of current baking paint. In the aspect of waterborne acrylic amino baking varnish, early research mainly focuses on water-soluble acrylic amino baking varnish varieties, because the water-soluble acrylic amino baking varnish varieties have good fullness, high glossiness and good weather resistance, but a large amount of organic cosolvent is required to be added in the solvent dilution process of water-soluble acrylic resin, so that the VOC emission is higher. Relatively speaking, the emulsion acrylic amino baking varnish is safer and more environment-friendly, does not have the problem of dilution viscosity peak, and can be prepared into high-solid coating, thereby becoming a new research direction of the water-based acrylic amino baking varnish. However, the existing emulsion acrylic amino baking paint also has the problems of insufficient glossiness, easy occurrence of shrinkage cavity, poor adhesive force, poor water resistance and weather resistance, insufficient smoothness and fineness of the paint film surface and the like.
The salt spray resistance of the amino baking varnish coating does not reach the standard, and becomes a key factor for restricting the wide application of the amino baking varnish coating in China, and the method for improving the salt spray resistance of the anti-corrosion amino baking varnish coating generally adds various anti-rust pigments or fillers, and the pigments or fillers can influence the gloss and cannot be made into finish paint; meanwhile, the pigments with good salt fog resistance contain heavy metals such as chromium, strontium and the like, and the heavy metal-containing anti-trapping pigments have serious environmental pollution and are not beneficial to popularization and application of the water-based acrylic amino baking paint.
Disclosure of Invention
In order to overcome the defect that the existing water-based acrylic amino baking paint has poor performances such as glossiness and salt spray resistance, the invention provides an environment-friendly high-gloss high-salt spray acrylic amino baking paint coating and a preparation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention discloses a water-based acrylic amino baking varnish coating which comprises the following components in percentage by mass:
45-55% of water-based acrylic emulsion, 5-10% of water-based acrylic baking varnish resin, 0.2-0.4% of defoaming agent, 0.1-0.2% of flatting agent, 0.2-0.4% of wetting dispersant, 0.5-1% of organic antirust agent, 1-2% of amino resin, 0.5-1% of cross-linking agent, 0.3-0.5% of dimethylethanolamine, 5-10% of pigment, 10-15% of filler, 0.3-0.5% of thickening agent and 20-25% of deionized water.
In certain embodiments, the defoamer is a mixture of defoamer BYK028 and defoamer cornin a 10.
In certain embodiments, the defoamer has a BYK028 mass percent content of 33.3% to 66.7%.
In certain embodiments, the aqueous acrylic emulsion is a water-balanced shine-gloss aqueous acrylic emulsion XG-9239.
In certain embodiments, the aqueous acrylic baking varnish resin is Jiangmen PJ6250-70.
In certain embodiments, the amino resin is a homoimino methylated amino resin.
In certain embodiments, the amino resin is MR625 from taiwan vinpocetine chemical.
In certain embodiments, the crosslinking agent is an oxazoline-based polymer.
In certain embodiments, the cross-linking agent is WS-500 from Dongguan new Ye.
In certain embodiments, the organic rust inhibitor is T750 of hofmann, switzerland.
In certain embodiments, the leveling agent is BYK346.
In certain embodiments, the wetting dispersant is BYK-190.
In certain embodiments, the pigment is at least one of titanium dioxide LR-996, carbon black MA-100.
In certain embodiments, the filler is at least one of bentonite EW, precipitated barium sulfate, heavy calcium.
In a second aspect, the invention discloses a preparation method of a water-based acrylic amino baking varnish coating, which comprises the following steps:
(1) Uniformly stirring and mixing 60% of dimethylethanolamine, 50% of defoaming agent, wetting dispersant and 75% of deionized water, adding pigment and filler, stirring to obtain mixed slurry, and grinding the mixed slurry to obtain prophase slurry;
(2) Stirring and mixing the water-based acrylic emulsion, the water-based acrylic baking varnish resin, the amino resin, the cross-linking agent WS-500, the leveling agent, the balance of deionized water, the balance of dimethylethanolamine and the balance of defoaming agent to obtain a mixed base material;
(3) And mixing the early-stage slurry and the mixed base material, adding a thickening agent, adjusting the system viscosity, and stirring to obtain the acrylic amino baking varnish coating.
In certain embodiments, the mixed slurry in step (1) has a fineness of less than or equal to 25 μm.
In certain embodiments, the base material is mixed in step (2) at a stirring speed of 400 to 500r/min for a stirring time of 15min.
In certain embodiments, the system in step (3) is stirred at a speed of 700 to 900r/min for a period of 15 to 20min.
Compared with the prior art, the invention has the following beneficial effects:
(1) The amino baking varnish disclosed by the invention uses the high-gloss water-based acrylic emulsion, so that on one hand, no organic solvent is required to be added in the production process, the VOC emission is low, and the amino baking varnish is safe and environment-friendly; in addition, the high-gloss water-based acrylic emulsion can improve the gloss of a paint film, and low-temperature baking type acrylic resin is selected for use, so that the product cost is effectively reduced.
(2) The organic antirust agent T750 used in the invention is an environment-friendly antirust agent, and can quickly passivate the surface of metal to achieve high salt spray resistance, thereby not only avoiding the introduction of heavy metal, but also not influencing the gloss of a paint film.
(3) The cross-linking agent is a high-safety oxazoline group polymer, can react with carboxyl in a matrix at a low temperature, and improves the cross-linking density of a paint film, so that the paint film is more compact, and meanwhile, the gloss of the paint film is also improved; in addition, with the increase of the crosslinking density of the paint film, the properties of water resistance, solvent resistance, heat resistance, paint film strength and the like are greatly improved.
(4) The acrylic amino baking varnish paint has the advantages of high gloss, no heavy metal, high salt mist resistance, simple preparation method, no complex process, no need of special equipment, low production cost, contribution to enterprise scale production and good market application prospect.
Detailed Description
The present invention will be described in further detail with reference to examples.
The raw materials involved in the invention are purchased from the following manufacturers:
the high gloss acrylic emulsion XG-9239 is selected from Heishi New gloss materials science and technology Limited;
the amino resin MR625 is a high imino methylated amino resin selected from chemical engineering of Taiwan Changchun;
the waterborne acrylic baking finish resin PJ6250-70 is selected from paint manufacturing factory limited company in Jiangmen;
the organic antirust agent T750 is an environment-friendly antirust agent selected from Hofmann;
the cross-linking agent WS-500 is a high-safety oxazoline group polymer, can react with carboxyl at low temperature to improve the cross-linking density, and is selected from Dongguan new Ye new material science and technology company;
other components can be selected from various raw materials known to those skilled in the art, wherein the particle size of barium sulfate selected in the examples is 1500 meshes.
Examples 1 to 4
A waterborne acrylic amino stoving varnish coating, the components of examples 1-4 are shown in Table 1 below.
TABLE 1 table of raw material components for examples 1-4
The preparation method of the acrylic amino baking varnish coatings of examples 1 to 4 comprises the following steps:
(1) Uniformly stirring and mixing 60% of dimethylethanolamine, 50% of defoaming agent, wetting dispersant and 75% of deionized water at 400-500r/min, adding pigment, organic bentonite and precipitated barium sulfate, stirring at 700-800r/min for 15-20min to obtain mixed slurry, and grinding the mixed slurry until the fineness is less than or equal to 25 mu m to obtain early-stage slurry;
(2) Stirring and mixing the water-based acrylic emulsion, the water-based acrylic baking varnish resin, the amino resin, the cross-linking agent WS-500, the leveling agent, the balance of deionized water, the balance of dimethylethanolamine and the balance of defoaming agent for 15min at a speed of 400-500r/min to obtain a mixed base material;
(3) And mixing the early-stage slurry and the mixed base material, adding a thickening agent, adjusting the system viscosity, and stirring at 700-900r/min for 15-20min to obtain the environment-friendly high-gloss high-salt spray acrylic amino baking paint.
Comparative example 1
The organic rust inhibitor T750 in example 1 was replaced with the same amount of strontium phosphosilicate SW-111, and the other components and preparation method were the same as in example 1 to prepare an aqueous acrylic amino baking varnish.
Comparative example 2
The crosslinking agent WS-500 in example 1 was replaced with the same amount of Ribose chemical company CARBODILITE V-02, and the other components and preparation method were the same as in example 1, to obtain a water-based acrylic amino baking varnish.
Performance testing
Appearance: visual inspection;
gloss (60 °): according to the method for testing the gloss in the national standard GB/T9754;
the impact strength test method comprises the following steps: according to the test method of the impact strength in the national standard GB/T1732;
the adhesion test method comprises the following steps: according to the test method of the adhesive force in the national standard GB/T9286;
the hardness test method comprises the following steps: according to the test method of hardness in the national standard GB/T6739;
water resistance test method: according to the water resistance test method in the national standard GB/T1733;
the salt water resistance test method comprises the following steps: according to the testing method of the salt water resistance in the national standard GB/T1763;
weather resistance test method: according to the test method of the weather resistance in the national standard GB/T1865.
According to the above standards, the examples of the present invention and the comparative examples were subjected to performance tests, and the measured performance indexes are shown in table 2.
TABLE 2 indexes of performance test of examples and comparative examples
As can be seen from the data in Table 2, compared with the comparative example, the organic antirust agent T750 is adopted in the invention, so that the salt spray resistance and corrosion resistance of the waterborne acrylic amino baking paint are enhanced; the cross-linking agent WS-500 can react with carboxyl in a matrix at low temperature, so that the cross-linking density of a paint film is improved, the paint film is more compact, the gloss of the paint film is improved, and the water resistance, the impact strength and other properties of the paint film are greatly improved.
The invention uses the high-gloss water-based acrylic emulsion, not only can improve the gloss of a paint film, but also uses the low-temperature baking type acrylic resin to effectively reduce the product cost, uses the amino resin in a matching way to further improve the gloss of the paint film and increase the salt spray resistance of the paint film, and simultaneously uses the organic antirust auxiliary agent and introduces the oxazoline group polymer cross-linking agent to further perform cross-linking reaction with carboxyl in the water-based acrylic baking paint at normal temperature to enhance the water resistance, solvent resistance, heat resistance and film strength of the paint film, thereby leading the acrylic amino baking paint to achieve the performances of high gloss, no heavy metal and high salt spray resistance.
The foregoing is directed to embodiments of the present invention, and it is understood that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. The water-based acrylic amino baking varnish coating is characterized by comprising the following components in percentage by mass:
45-55% of water-based acrylic emulsion, 5-10% of water-based acrylic baking varnish resin, 0.2-0.4% of defoaming agent, 0.1-0.2% of flatting agent, 0.2-0.4% of wetting dispersant, 0.5-1% of organic antirust agent, 1-2% of amino resin, 0.5-1% of cross-linking agent, 0.3-0.5% of dimethylethanolamine, 5-10% of pigment, 10-15% of filler, 0.3-0.5% of thickening agent and 20-25% of deionized water.
2. The water-based acrylic amino baking paint coating as claimed in claim 1, wherein the defoaming agent is a mixture of a defoaming agent BYK028 and a defoaming agent Kenin A10, and the mass percentage content of BYK028 in the defoaming agent is 33.3% -66.7%.
3. The aqueous acrylic amino stoving varnish coating of claim 1, characterised in that the aqueous acrylic emulsion is a water-balanced fresh gloss high gloss aqueous acrylic emulsion XG-9239.
4. The aqueous acrylic amino baking varnish coating of claim 1, wherein the aqueous acrylic baking varnish resin is PJ6250-70 of Jiangmen paint.
5. The waterborne acrylic amino baking varnish coating of claim 1, wherein the amino resin is a homoimino methylated amino resin.
6. The aqueous acrylic amino baking varnish coating of claim 1, wherein the cross-linking agent is an oxazoline-based polymer.
7. The aqueous acrylic amino baking varnish coating of claim 1, wherein the organic rust inhibitor is T750 of hofmann, switzerland.
8. The aqueous acrylic amino baking varnish coating material as recited in claim 1,
the leveling agent is BYK346;
the wetting dispersant is BYK-190;
the pigment is at least one of titanium dioxide LR-996 and carbon black MA-100;
the filler is at least one of organic bentonite EW, precipitated barium sulfate and heavy calcium carbonate.
9. The method for preparing the aqueous acrylic amino baking varnish coating of claim 1, characterized by comprising the following steps:
(1) Uniformly stirring and mixing 60% of dimethylethanolamine, 50% of defoaming agent, wetting dispersant and 75% of deionized water, adding pigment and filler, stirring to obtain mixed slurry, and grinding the mixed slurry to obtain prophase slurry;
(2) Stirring and mixing the water-based acrylic emulsion, the water-based acrylic baking varnish resin, the amino resin, the cross-linking agent WS-500, the leveling agent, the balance of deionized water, the balance of dimethylethanolamine and the balance of defoaming agent to obtain a mixed base material;
(3) And mixing the early-stage slurry and the mixed base material, adding a thickening agent, adjusting the system viscosity, and stirring to obtain the acrylic amino baking varnish coating.
10. The preparation method of the water-based acrylic amino baking varnish coating as claimed in claim 9, wherein the grinding fineness of the mixed slurry in the step (1) is less than or equal to 25 μm; in the step (2), the stirring speed of the mixed base material is 400-500r/min, and the stirring time is 15min; the stirring speed of the system in the step (3) is 700-900r/min, and the stirring time is 15-20min.
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| CN110669398A (en) * | 2019-10-14 | 2020-01-10 | 河北晨阳工贸集团有限公司 | Radiation-proof water-based amino baking paint and preparation method thereof |
| CN113502098A (en) * | 2021-07-23 | 2021-10-15 | 宁波宇明工程防腐材料有限公司 | Environment-friendly low-VOC (volatile organic compound) water-based acrylic amino baking paint and preparation method thereof |
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2022
- 2022-07-05 CN CN202210791441.2A patent/CN115895359A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120045585A1 (en) * | 2009-04-24 | 2012-02-23 | Mazda Motor Corporation | Method for the formation of multi-layer paint films |
| CN107057511A (en) * | 2017-01-06 | 2017-08-18 | 河北晨阳工贸集团有限公司 | A kind of water-based silver powder amino-stoving varnish and preparation method thereof |
| CN108690427A (en) * | 2018-03-12 | 2018-10-23 | 河北晨阳工贸集团有限公司 | A kind of aqueous mallear stria baking vanish and preparation method thereof |
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| CN110305547A (en) * | 2019-06-14 | 2019-10-08 | 江苏兰陵高分子材料有限公司 | A kind of water soluble acrylic acid amino-stoving varnish of low-temperature bake and preparation method thereof |
| CN110669398A (en) * | 2019-10-14 | 2020-01-10 | 河北晨阳工贸集团有限公司 | Radiation-proof water-based amino baking paint and preparation method thereof |
| CN113502098A (en) * | 2021-07-23 | 2021-10-15 | 宁波宇明工程防腐材料有限公司 | Environment-friendly low-VOC (volatile organic compound) water-based acrylic amino baking paint and preparation method thereof |
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