CN112694816A - HAA system powder coating with improved coating surface pinhole defects - Google Patents
HAA system powder coating with improved coating surface pinhole defects Download PDFInfo
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- CN112694816A CN112694816A CN202011496776.9A CN202011496776A CN112694816A CN 112694816 A CN112694816 A CN 112694816A CN 202011496776 A CN202011496776 A CN 202011496776A CN 112694816 A CN112694816 A CN 112694816A
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses an HAA system powder coating with improved coating surface pinhole defects, which comprises 60-70 parts of carboxyl polyester resin, 4-5 parts of HAA curing agent, 1-1.5 parts of flatting agent, 0.5-1 part of degassing agent, 0.5-1 part of antioxidant, 0.5-1 part of brightener, 0.5-1 part of dispersing aid, 0.5-1 part of degassing agent, 3-6 parts of toughening agent and 15-20 parts of weather-resistant pigment. The HAA system powder coating with the improved coating surface pinhole defects has a better surface, and can effectively improve the defects of 'pinholes' and 'craters' on the surface after the coating is coated.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to an HAA system powder coating with improved coating surface pinhole defects.
Background
Powder coatings can be divided into two main categories, indoor and outdoor, depending on the object to which they are applied. Among them, the powder coating applied outdoors includes TGIC system, HAA system, TMMGU system, PUR system, fluorocarbon system, and the like. TGIC systems have many advantages in terms of weather resistance, heat resistance, yellowing resistance and suitable reactivity, and their main technical advantage is that no volatiles are evolved after curing, due to the crosslinking chemistry of TGIC, which is an addition condensation. The powder coating system consisting of TGIC can achieve low to high temperature, slow to fast cure and different surface effects, which also provides a very wide space for its development, and the TGIC system has been the first choice for outdoor coating for a long time, and TGIC is considered as the most perfect cross-linking agent. However, TGIC is questioned because of its problems with biotoxicity. Since the 90 s of the 20 th century, with the emphasis on self-health and living environment, many countries in the world have successively banned or restricted their use, and more TGIC substitutes have been invented, in which the most closely related, most influential, and widely used curing agents of the hydroxyalkylamide type have been used in amounts second to TGIC.
As is well known, HAA-system powder coating refers to a powder coating system having a carboxyl polyester as a main film-forming substance and a hydroxyalkyl amide compound as a curing agent. Such curing agents can undergo the following crosslinking reaction with the carboxyl polyester:
generally, the esterification reaction between the alcoholic hydroxyl group and the carboxyl group is difficult to be carried out at a low reaction temperature, but the reaction can be carried out under the condition of 150 ℃ due to the activation of the hydroxyl group by the beta-position amide group, and small molecular water is generated as a byproduct. This lower reaction temperature makes it possible to cure HAA at low temperatures, typically between 190 ℃ and 200 ℃ for HAA-system thermosetting powder coatings. However, the small molecular water generated by the esterification reaction is vaporized at 150 ℃ or higher, and then escapes from the cured coating in the form of water vapor, so that the defects of pinholes, craters and the like appear on the surface of the HAA system powder coating.
In order to overcome the defects of 'pinholes' or 'craters' on the surface of HAA system powder coating, the most common method at present is to add a degasifier to inhibit the generation of the surface defects. The function of the degasifier is generally to react with substances such as residual air in the coating while the film-forming substance and the curing agent are in a crosslinking reaction, or to allow small molecular compounds or air to escape from the coating before the coating is cured, thereby realizing the function of improving surface defects.
EP-A-322834 describes ｃA powder coating, which is ｃA thermosetting HAA system powder coating prepared by using carboxyl polyester resin as ｃA film-forming substance and betｃA-hydroxyalkylamide as ｃA curing agent, and benzoin as ｃA degasifier is added to the formulｃA of the powder coating to improve pinhole defects on the surface of the HAA system powder coating. The addition of benzoin can cause oxidation reaction with air remained in the coating layer during the baking process of the powder coating, thereby eliminating the pinhole influence of the remained air on the coating layer. According to the expression in the text, the benzoin is added in an amount of 0.3-0.4% in order to achieve good degassing. However, the use of large amounts of benzoin significantly increases the yellowing tendency of the coating, and therefore this way of adding large amounts of benzoin to HAA system powder coatings to improve surface pinholes is not suitable for white or light colored coatings.
In order to overcome the defect of coating yellowing caused by applying benzoin as a degasifier to a powder coating, a low-melting-point and low-viscosity crystalline amide wax is applied to the powder coating as the degasifier. Patent EP0471409 discloses a powder coating, which is a thermosetting HAA system powder coating prepared by using carboxyl polyester resin as a film forming substance and beta-hydroxyalkylamide as a curing agent, and N, N' -ethylene bis stearamide as a degasifier is added to the formula of the powder coating to improve pinhole defects on the surface of the HAA system. The viscosity of the amide degasifier is only 15mPa.s (150 ℃), and the amide degasifier has low surface tension, can effectively promote small molecular compounds or air to escape in the curing process of the powder coating without influencing the color of the coating, and simultaneously has the function of repairing pinholes or elastic holes due to the precipitation of wax on the surface of the coating, thereby realizing the effect of eliminating the pinholes on the surface of the coating. However, such low-melting amide waxes are generally found to be of limited effectiveness in practical use and, in addition, affect the weathering performance of the coating, which is undesirable in practical use.
Therefore, it is highly desirable to develop a HAA system powder coating composition that improves weatherability and effectively improves the surface defects of "pinholes" and "craters" in HAA system powder coatings.
Disclosure of Invention
The invention aims to provide a HAA system powder coating with improved coating surface pinhole defects and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the HAA system powder coating with the function of improving the pinhole defects on the surface of a coating comprises the following raw materials in parts by weight:
60-70 parts of carboxyl polyester resin
4-5 parts of HAA curing agent
1-1.5 parts of flatting agent
0.5-1 part of degassing agent
0.5-1 part of antioxidant
0.5-1 part of brightener
0.5-1 part of dispersing auxiliary agent
0.5 to 1 portion of degassed wax
3-6 parts of toughening agent
15-20 parts of weather-resistant pigment.
Further, the carboxyl polyester resin is a β -hydroxyalkylamide.
Further, the weather-resistant pigment is rutile titanium dioxide.
Further, the degassing agent is benzoin.
Further, the raw material also comprises 10 parts by weight of polyacrylic resin containing the anhydride group functionality.
Compared with the prior art, the invention has the beneficial effects that: the HAA system powder coating disclosed by the invention has ultralow surface energy and stronger weather resistance, and can effectively improve the defects of ' pinholes ', craters ' and the like on the surface of the coated coating.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The HAA system powder coating with the improved coating surface pinhole defect comprises A, B two components, wherein:
60-70 parts of carboxyl polyester resin
4-5 parts of HAA curing agent
1-1.5 parts of flatting agent
0.5-1 part of degassing agent
0.5-1 part of antioxidant
0.5-1 part of brightener
0.5-1 part of dispersing auxiliary agent
0.5 to 1 portion of degassed wax
3-6 parts of toughening agent
15-20 parts of weather-resistant pigment.
Further, the carboxyl polyester resin is a β -hydroxyalkylamide.
Further, the weather-resistant pigment is rutile titanium dioxide.
Further, the degassing agent is benzoin.
Further, while the examples of the present invention have been shown and described with respect to the starting materials comprising 10 parts by weight of polypropylene containing anhydride group functionality, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these examples without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The HAA system powder coating with the function of improving the pinhole defects on the surface of a coating is characterized by comprising the following raw materials in parts by weight:
60-70 parts of carboxyl polyester resin
4-5 parts of HAA curing agent
1-1.5 parts of flatting agent
0.5-1 part of degassing agent
0.5-1 part of antioxidant
0.5-1 part of brightener
0.5-1 part of dispersing auxiliary agent
0.5-1 part of degassing agent
3-6 parts of toughening agent
15-20 parts of weather-resistant pigment.
2. The HAA system powder coating with improved pinhole defects on the coating surface according to claim 1, characterized in that the carboxyl polyester resin is a β -hydroxyalkylamide.
3. The HAA system powder coating with improved pinhole defects on the coating surface of claim 1, wherein the air release agent is benzoin.
4. The HAA-system powder coating with improved pinhole defects in the coating surface of claim 1, wherein the weatherable pigment is rutile titanium dioxide.
5. The HAA system powder coating with improved pinhole defects on the coating surface according to claim 1, characterized in that the raw material further comprises 10 parts by mass of a polyacrylic resin containing anhydride functionality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011496776.9A CN112694816A (en) | 2020-12-17 | 2020-12-17 | HAA system powder coating with improved coating surface pinhole defects |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011496776.9A CN112694816A (en) | 2020-12-17 | 2020-12-17 | HAA system powder coating with improved coating surface pinhole defects |
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| CN112694816A true CN112694816A (en) | 2021-04-23 |
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| CN202011496776.9A Pending CN112694816A (en) | 2020-12-17 | 2020-12-17 | HAA system powder coating with improved coating surface pinhole defects |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0322834A2 (en) * | 1987-12-30 | 1989-07-05 | Ppg Industries, Inc. | Hydroxyalkylamide powder coating curing system |
| EP0471409A1 (en) * | 1990-08-13 | 1992-02-19 | Dsm N.V. | Powder coating |
| CN101622065A (en) * | 2007-07-04 | 2010-01-06 | 株式会社日本触媒 | Particulate water-absorbing agent and method for producing the same |
| CN101851460A (en) * | 2010-06-04 | 2010-10-06 | 江苏兰陵高分子材料有限公司 | Polyester powder coating for solar water heater |
| US20110172330A1 (en) * | 2007-09-11 | 2011-07-14 | Byk-Chemie Gmbh | Polypropylene oxide-containing polyethers and mixtures thereof with poly(meth)acrylates as powder coating leveling agents |
| CN103205182A (en) * | 2013-04-26 | 2013-07-17 | 徐伟箭 | Weather-resistant and environmentally-friendly powder coating for household appliances |
| CN108219550A (en) * | 2017-12-29 | 2018-06-29 | 广西平果宝信涂料有限公司 | Polyester-type exempts from Lacquer finish Huang bottom powder and preparation method thereof |
| CN111363456A (en) * | 2020-04-29 | 2020-07-03 | 安徽省华安进出口有限公司 | HAA system powder coating with improved coating surface pinhole defects |
-
2020
- 2020-12-17 CN CN202011496776.9A patent/CN112694816A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0322834A2 (en) * | 1987-12-30 | 1989-07-05 | Ppg Industries, Inc. | Hydroxyalkylamide powder coating curing system |
| EP0471409A1 (en) * | 1990-08-13 | 1992-02-19 | Dsm N.V. | Powder coating |
| CN101622065A (en) * | 2007-07-04 | 2010-01-06 | 株式会社日本触媒 | Particulate water-absorbing agent and method for producing the same |
| US20110172330A1 (en) * | 2007-09-11 | 2011-07-14 | Byk-Chemie Gmbh | Polypropylene oxide-containing polyethers and mixtures thereof with poly(meth)acrylates as powder coating leveling agents |
| CN101851460A (en) * | 2010-06-04 | 2010-10-06 | 江苏兰陵高分子材料有限公司 | Polyester powder coating for solar water heater |
| CN103205182A (en) * | 2013-04-26 | 2013-07-17 | 徐伟箭 | Weather-resistant and environmentally-friendly powder coating for household appliances |
| CN108219550A (en) * | 2017-12-29 | 2018-06-29 | 广西平果宝信涂料有限公司 | Polyester-type exempts from Lacquer finish Huang bottom powder and preparation method thereof |
| CN111363456A (en) * | 2020-04-29 | 2020-07-03 | 安徽省华安进出口有限公司 | HAA system powder coating with improved coating surface pinhole defects |
Non-Patent Citations (1)
| Title |
|---|
| 周坚等: "低成本聚酯粉末涂料表面改进的研究", 《涂料工业》 * |
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Application publication date: 20210423 |