KR101808382B1 - waterborne basecoat composition for automotive refinish - Google Patents
waterborne basecoat composition for automotive refinish Download PDFInfo
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- KR101808382B1 KR101808382B1 KR1020150075702A KR20150075702A KR101808382B1 KR 101808382 B1 KR101808382 B1 KR 101808382B1 KR 1020150075702 A KR1020150075702 A KR 1020150075702A KR 20150075702 A KR20150075702 A KR 20150075702A KR 101808382 B1 KR101808382 B1 KR 101808382B1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
Abstract
The present invention relates to an aqueous basecoat paint composition for automobile repair. More particularly, the present invention relates to a resin composition comprising a polyurethane dispersion resin and an acrylic emulsion resin as a resin component to provide an excellent coating film appearance and physical properties, The present invention relates to an aqueous basecoat paint composition useful for automobile repair.
Description
The present invention relates to an aqueous basecoat paint composition for automobile repair and an automobile part comprising the coating layer. More particularly, the present invention relates to a paint composition for an automobile repair, and more particularly to an automobile part comprising a polyurethane dispersion resin and an acrylic emulsion resin, The present invention relates to an aqueous basecoat paint composition which is environmentally friendly and excellent in paint workability and useful for automobile repair.
High-level industrialization has provided human-made sense of real life. As one of the most outstanding inventions in modern society, automobiles have been technologically grown since the 1980s, and their appearance has become more important. However, in recent years, the importance of conservation of the global environment has been emphasized rapidly, and in each industry, the development of technology for establishing the measures is progressing. Recently, European and advanced countries have been actively restricting the use of volatile organic compounds (VOCs), and they are imposing sanctions on products using them. Generally, volatile organic compounds, which are easily volatilized at room temperature, are naturally released in the air when they are present in a gaseous state, which is an important cause of air pollution. Volatile organic compounds have inherent biotoxicity and chemical reactivity and are known to cause various environmental problems. They cause serious environmental damage such as ozone layer formation in troposphere, destruction of stratosphere, greenhouse effect, odor generation .
Automobile repair paint is a paint that requires high workability and performance compared with other repair paint, and has been developed rapidly over the past decade, resulting in improved appearance of the coating. However, existing automobile repair coatings contain more than 65% of organic solvents as oil-soluble paints. Therefore, not only can not meet global environment preservation and international environmental regulations that are attracting attention in the world in recent years, but also paint Or damage to the health of workers who do painting work.
For example, Korean Patent Laid-Open No. 10-2005-0067781 discloses a high-solid paint in which the solid content of the resin, which is the main component of the paint component, is increased. However, the high- A considerable amount of an organic solvent such as acetylacetone, xylylene and xylene should be used at a level of 15%, and the manufacturing cost also increases greatly.
Accordingly, development of an aqueous basecoat paint composition for automobile repair which is environmentally friendly, excellent in painting workability, and capable of providing an excellent coating film appearance and physical properties (adhesion, water resistance, etc.) by greatly reducing the organic solvent content is required.
Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the problems of the prior art as described above, and it is an object of the present invention to provide an aqueous coating composition having no or substantially no organic solvent content and having excellent paint film appearance and physical properties by mixing polyurethane dispersion resin and acrylic emulsion resin as a resin component And also to provide an aqueous basecoat paint composition which is environmentally friendly and excellent in paint workability.
In order to solve the above-described technical problem, the present invention provides a method for repairing automobiles, which comprises 5 to 40% by weight of a polyurethane dispersion resin, 10 to 50% by weight of an acrylic emulsion resin and 15 to 60% An aqueous basecoat paint composition is provided.
The coating composition according to the present invention can minimize the amount of organic solvent that is released into the atmosphere during coating and can provide an excellent coating film appearance and physical properties (adhesion, water resistance, etc.) at the same time while enhancing environmental friendliness and safety of workers And can be particularly suitably used as a base coat for automobile repair.
Hereinafter, the present invention will be described in more detail.
(1) Polyurethane Dispersion Suzy
The polyurethane dispersion resin used in the coating composition of the present invention plays a role of securing excellent appearance such as improvement of adhesion of the coating composition and improvement of gloss retention rate.
The polyurethane dispersion resin may have a solid content of 20 to 40% by weight and a dynamic viscosity of 20 to 60 mPa.s. Specifically, an aliphatic polyester-polycarbonate, Based polyurethane resin can be used.
The polyester-polycarbonate-based polyurethane resin used in the present invention is a mixture of polyester and polycarbonate, and has a number average molecular weight of 10,000 to 100,000, an elongation of 500 to 1,000%, a tensile strength of 3,000 to 6,000 psi, It is more preferable that the particle size is 50 to 300 nm. If the elongation percentage of the resin is less than 500%, the soft touch, which is the characteristic of the textured paint, is lost. If the elongation exceeds 1,000%, the coating film remains viscous and physical properties such as stain resistance, scratch resistance and abrasion resistance may be deteriorated.
The coating composition of the present invention contains 5 to 40% by weight, preferably 10 to 35% by weight, and more preferably 10 to 30% by weight of a polyurethane dispersion resin, based on 100% by weight of the total composition . If the content of the polyurethane dispersion polymer is less than 5% by weight, there may be a problem in realizing physical properties such as adhesion and water resistance. If the content is more than 40% by weight, poor storage stability and poor stainability may occur.
(2) Acrylic emulsion Suzy
The acrylic emulsion resin used in the coating composition of the present invention improves the orientation of effect pigments such as metallic.
The acrylic emulsion resin may have a solid content of 20 to 40% by weight and a dynamic viscosity of 10 to 50 mPa.s. Specifically, an acrylic resin having a core-shell structure may be used.
The acrylic resin having the core-shell structure may be formed from 10 to 90% by weight of the unsaturated monomer forming the core and from 90 to 10% by weight of the unsaturated monomer forming the shell based on the total weight of the resin, An initiator, an emulsifier, and the like.
The core and / or shell monomer may be used alone as the monomer selected from alkyl acrylates having an alkyl group having 1 to 8 carbon atoms, or may be used as a monomer selected from the group consisting of butyl acrylate, 2-ethylbutyl acrylate, 2-ethylhexyl acrylate, Any one or a mixture of two or more selected from among ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate and butyl methacrylate can be used.
Preferably, the shell monomer may be at least one or more unsaturated monomers selected from the group consisting of hydroxyalkyl acrylates and hydroxyalkyl methacrylates having an alkyl group having 5 to 8 carbon atoms containing at least one hydroxyl group.
The coating composition of the present invention may contain 10 to 50% by weight, preferably 10 to 45% by weight, and more preferably 15 to 45% by weight, based on 100% by weight of the total composition of the acrylic emulsion resin . When the content of the acrylic emulsion resin is less than 10% by weight, there may be a problem in the orientation and the like with respect to the effect pigments, and when it exceeds 50% by weight, poor storage stability due to an increase in viscosity may occur.
(3) Water
The coating composition of the present invention contains water as an essential solvent component, more specifically deionized water.
The coating composition of the present invention may contain water in an amount of 15 to 60% by weight, preferably 20 to 55% by weight, more preferably 25 to 50% by weight based on 100% by weight of the total composition. If the content of water is less than 15% by weight, the content of the resin may be increased and the price may be increased or the VOC may be increased. On the other hand, when the content of the water exceeds 60% by weight, the content of the resin may be lowered,
(4) Additives
In addition to the above-mentioned components, the coating composition of the present invention may contain the following additives within the scope of achieving the object of the present invention.
The coating composition of the present invention may further include a non-aqueous solvent as an additional solvent component in order to further improve spray workability and the like. As the non-aqueous solvent, an alcohol solvent, an ether solvent, or a combination thereof may be used. Examples of the solvent for the alcohol include methanol, ethanol, butanol, and isobutanol. Examples of the ether solvent include ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol butyl ether, ethylene glycol pentyl ether, Dipropylene glycol methyl ether, dipropylene glycol butyl ether, and the like.
When the non-aqueous solvent is contained in the coating composition of the present invention, the content thereof is preferably 10% by weight or less (for example, 1 to 10% by weight) based on 100% by weight of the total composition, Or less (for example, 2 to 8% by weight). If the amount of the non-aqueous solvent to be used is too small, the intended use thereof can not be achieved. On the other hand, if the amount is too large, the amount of VOC generated in the paint may increase and the storage stability may be deteriorated.
In addition, the coating composition of the present invention may preferably further comprise a metallic pigment stabilizer.
As the metallic pigment stabilizer, a hydroxy-functional phosphate ester compound can be used, and it has a structure represented by the following formula (1).
[Chemical Formula 1]
Wherein R is C6-10 aryl substituted with (i) halo, (ii) hydroxy or C1-6 alkoxy, or (iii) C6-20 arylalkyl substituted with hydroxy or C1-6 alkoxy .
The metallic pigment stabilizer may preferably be a Free Acid of Complex Alkyl / Aryl Phosphate Ester of an alkyl / aryl complex phosphate ester.
When such a metallic pigment stabilizer is used, it is possible to prevent oxygen generation (gassing) by metallic oxidation and ensure excellent storability when a metallic pigment is applied to a PRE-TREAMENT process in the production of a paint, Adhesion and water resistance can be remarkably improved.
When the metallic pigment stabilizer is included in the coating composition of the present invention, the content thereof is preferably 0.1 to 1% by weight, more preferably 0.2 to 0.8% by weight, based on 100% by weight of the total composition. If the amount of the metallic pigment stabilizer used is too small, the intended use can not be attained. On the contrary, if the amount is too large, the cost may rise and gelation may occur during storage.
In addition, the coating composition of the present invention may further comprise at least one additive for further improving paint workability and / or physical properties of the coating film, and more specifically, it may contain at least one additive selected from the group consisting of antifoaming agents, thickeners, weathering additives, And may further comprise one or more additives selected.
There is no particular limitation on the kind of the above-mentioned defoaming agent, and a defoaming agent usually used in the production of a water-based coating composition can be used. For example, a liquid hydrocarbon type, a silicone type, a synthetic copolymer type defoaming agent, or a mixture thereof may be used, but is not limited thereto.
There is no particular limitation on the kind of the thickener, and a thickener generally used in the production of a water-base coating composition may be used. For example, a urethane-based thickener, and more specifically, a nonionic urethane rheology modifier may be used, but the present invention is not limited thereto.
There is no particular limitation on the kind of the weather-resistant additive, and weather-resistant additives generally used in the production of a water-based paint composition can be used. For example, it may be selected from the group consisting of hydroxybenzophenone, hydroxyphenylbenzotriazole, hydroxybenzotriazine-based ultraviolet absorber, hindered amine light stabilizer (HALS), and combinations thereof, but is not limited thereto.
There is no particular limitation on the kind of the cryoprotectant, and a cryoprotectant generally used in the production of the water-base coating composition may be used. For example, glycols such as ethylene glycol, propylene glycol, and tripropylene glycol may be used alone or in combination, but the present invention is not limited thereto.
There is no particular limitation on the kind of the pigment, and a pigment usually used in the production of the aqueous coating composition may be used. For example, metallic pigments, pearl pigments, colored pigments, etc. may be used alone or in combination, but the present invention is not limited thereto.
There is no particular limitation on the type of the leveling agent, and a leveling agent generally used in the production of a water-base coating composition may be used. For example, nonionic acrylic copolymers, ionic polyacrylate-based surfactants, and acetylenic diol-based surfactants can be used alone or in combination, but the present invention is not limited thereto.
There is no particular limitation on the amount of the above-mentioned optional additive components, and it can be used in an amount usually used in a water-based paint composition. For example, each of the additive components may be appropriately used within a range of 0.01 to 3% by weight based on 100% by weight of the total composition, but is not limited thereto.
The method for producing the coating composition of the present invention is not particularly limited, and can be produced by using the conventional aqueous coating material production method and equipment as it is, or by appropriately modifying and using it.
The paint composition of the present invention minimizes the content of the organic solvent component (VOC) by using water as a main solvent, thereby reducing the environmental pollution problem caused by the volatile organic compound (VOC), the risk of fire due to flammability, It is possible to solve the problems of environmental regulations related to the environment, improve the storage stability of paints, and significantly improve the physical properties of coatings such as appearance, adhesion and water resistance, And can be suitably used as a base coat.
Therefore, according to another aspect of the present invention, there is provided an automobile part comprising at least one coating layer formed from the coating composition of the present invention.
Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the scope of the present invention is not limited to these examples.
[ Example ]
Base coats of Examples 1 to 4 and Comparative Examples 1 and 2 were produced in the compositions shown in Tables 1 and 2 below.
A base coat of each of the examples and comparative examples was coated with a film thickness of 20 to 22 mu m using a spray gun on a conductor to be painted for automobile repair, and a solvent type clearing for automobile repair was coated thereon.
For each of the prepared base coat and coated specimen, the following items were measured or evaluated and shown in Tables 1 and 2.
[Ingredients Used]
Polyurethane Dispersion Resin (Bayer, Bayhydrol UH XP 2648/1): Polyester resin based on aliphatic polyester-polycarbonate, solid content 35% by weight, viscosity 40 mPa.s
Urethane Dispersion Resin (KCC) Solid content 35%, number average molecular weight 20,000, acid value 18-23 mgKOH / g, particle size 50-80 nm
Acrylic emulsion resin (KCC): Acrylic resin having a core-shell structure, having a solid content of 24% by weight, a viscosity of 30 mPa.s, an acid value of 15 to 25 mgKOH / g,
Antifoaming agent: Agitan 281 (Munzing)
Thickener: RM-8W (Rohm & Haas)
Weatherability additive: Hydroxybenzophenone
Cryoprotectants: propylene glycol
Leveling agent: Surfynol 104 (Air product)
Non-aqueous solvent: n-butanol
Metallic pigment stabilizer: an alkyl / aryl complex phosphate ester having a solid content of 60% by weight
Metallic pigment: Aluminum coated with silica
[Properties]
1) Appearance: Measurement of the CF (Combined Ford: sharpness, orange peel, Luster function value) of the specimen after painting using WAVE SCAN (Appearance is better as the CF value is higher)
2) Adhesiveness: After coating, scribe a 10x10 grid of 2mm on the specimen, and perform the transparent tape squeeze test 4 times and check the attached ratio
3) Water resistance: After 10 days at 40 ° C, confirm the occurrence and size of the blister (according to ASTM D714 Evaluating Degree of Blistering of Paint)
4) Color difference after heat storage: Before and after storage of heat, each paint is painted with automatic paint machine and color difference is compared using a colorimeter. Evaluation of L *, a *, b * and ΔE values at 15 °, 45 ° and 110 ° (Examples 3 to 4 and Comparative Example 2)
As can be seen from Tables 1 and 2, the compositions of Examples 1 to 4 of the present invention were remarkably excellent in appearance, adhesion and water resistance as compared with Comparative Examples. As can be seen from Table 2, Storage stability was also significantly better than the comparative example. Thus, the coating composition according to the present invention is environmentally friendly and can enhance the safety of the worker, thereby providing excellent paint workability and at the same time providing an excellent coating film appearance and physical properties (adhesion, water resistance, etc.) It can be seen that it is particularly suitable for use as a base coat.
Claims (5)
The polyurethane dispersion resin has an elongation of 500 to 1,000%
The acrylic emulsion resin has a core-shell structure,
Wherein the core is formed from at least one monomer selected from alkyl acrylates having an alkyl group having from 1 to 8 carbon atoms,
Wherein the shell comprises at least one selected from the group consisting of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms, a hydroxyalkyl acrylate having an alkyl group having 5 to 8 carbon atoms containing at least one hydroxyl group, and a hydroxyalkyl methacrylate Lt; RTI ID = 0.0 > 1 < / RTI > monomers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150075702A KR101808382B1 (en) | 2015-05-29 | 2015-05-29 | waterborne basecoat composition for automotive refinish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150075702A KR101808382B1 (en) | 2015-05-29 | 2015-05-29 | waterborne basecoat composition for automotive refinish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20160141187A KR20160141187A (en) | 2016-12-08 |
| KR101808382B1 true KR101808382B1 (en) | 2017-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150075702A KR101808382B1 (en) | 2015-05-29 | 2015-05-29 | waterborne basecoat composition for automotive refinish |
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| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008545050A (en) * | 2005-07-01 | 2008-12-11 | ザ シャーウィン−ウィリアムズ カンパニー | Multilayer coating system containing hydroxyl group-modified polyurethane dispersion binder |
| KR101267700B1 (en) | 2006-07-20 | 2013-05-27 | 주식회사 노루비케미칼 | Two type water based metallic coating composition for interior materials of automobile |
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2015
- 2015-05-29 KR KR1020150075702A patent/KR101808382B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008545050A (en) * | 2005-07-01 | 2008-12-11 | ザ シャーウィン−ウィリアムズ カンパニー | Multilayer coating system containing hydroxyl group-modified polyurethane dispersion binder |
| KR101267700B1 (en) | 2006-07-20 | 2013-05-27 | 주식회사 노루비케미칼 | Two type water based metallic coating composition for interior materials of automobile |
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| Publication number | Publication date |
|---|---|
| KR20160141187A (en) | 2016-12-08 |
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