CN113956747B - Weather-resistant powder coating - Google Patents
Weather-resistant powder coating Download PDFInfo
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- CN113956747B CN113956747B CN202111303608.8A CN202111303608A CN113956747B CN 113956747 B CN113956747 B CN 113956747B CN 202111303608 A CN202111303608 A CN 202111303608A CN 113956747 B CN113956747 B CN 113956747B
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- weather
- powder coating
- titanium dioxide
- resistant
- weatherable
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
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- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of powder coating preparation, and particularly discloses a weather-resistant powder coating. The weather-resistant powder coating is prepared by taking epoxy resin and/or polyester resin as main raw materials, and a weather-resistant composition is added in the process of preparing the weather-resistant powder coating; the weatherable composition comprises: light stabilizer, antioxidant and titanium dioxide. The invention adds the weather-resistant composition consisting of the light stabilizer, the antioxidant and the titanium dioxide; so that the prepared powder coating has certain photooxidation aging resistance and salt spray resistance; greatly improves the outdoor weather resistance of the powder coating prepared by taking the epoxy resin and/or the polyester resin as main raw materials.
Description
Technical Field
The invention relates to the technical field of powder coating preparation, and particularly relates to a weather-resistant powder coating.
Background
The powder coating is a solid powdery synthetic resin coating composed of solid resin, a filler, an auxiliary agent and the like; it has no solvent pollution and thus may be used widely. The Chinese invention patent CN113321992A discloses an antibacterial powder coating, which takes polyester resin and epoxy resin as composite raw materials, takes single nano-silver as an antibacterial agent, and is added with high-temperature resistant filler; therefore, the prepared antibacterial powder coating not only has antibacterial performance, but also has high temperature resistance.
Although, chinese invention patent CN113321992A discloses an antibacterial powder coating with antibacterial property and high temperature resistance; but the photo-oxidative aging resistance is required to be further improved, and the salt spray resistance is not good. Therefore, the powder coating prepared by the Chinese invention patent CN113321992A has poor outdoor weather resistance, and is easy to age and corrode by salt fog.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the invention provides a weather-resistant powder coating.
The technical scheme of the invention is as follows:
a weather-resistant powder coating is prepared by taking epoxy resin and/or polyester resin as main raw materials, and a weather-resistant composition is added in the process of preparing the weather-resistant powder coating;
the weatherable composition comprises: light stabilizer, antioxidant and titanium dioxide.
In the process of preparing the powder coating by using the epoxy resin and/or the polyester resin as main raw materials, the weather-resistant composition consisting of the light stabilizer, the antioxidant and the titanium dioxide is added; the prepared powder coating has certain photooxidation aging resistance, and the outdoor weather resistance of the powder coating prepared by taking epoxy resin and/or polyester resin as main raw materials is improved; in addition, the inventor researches and discovers that the salt spray resistance of the powder coating can be improved by adding titanium dioxide.
Preferably, in the weather-resistant composition, the weight ratio of the light stabilizer to the antioxidant to the titanium dioxide is 1-3: 1-5: 20-40.
Preferably, in the weather-resistant composition, the weight ratio of the light stabilizer to the antioxidant to the titanium dioxide is 2:3: 30.
Preferably, the titanium dioxide is modified titanium dioxide;
the modified titanium dioxide is prepared by the following method:
(1) uniformly mixing titanium dioxide and polydimethylsiloxane to obtain a mixture;
(2) calcining the mixture for 1-3 h under the oxygen-enriched condition to obtain a solid; and grinding the obtained solid product uniformly to obtain the modified titanium dioxide.
After a great deal of experimental study, the inventor surprisingly found that: in the weather-resistant composition, the modified titanium dioxide obtained by modifying polydimethylsiloxane through the method replaces titanium dioxide, so that the salt spray resistance of the powder coating can be greatly improved.
Further preferably, the weight ratio of the titanium dioxide to the polydimethylsiloxane in the step (1) is 1: 1-2.
Optimally, the weight ratio of the titanium dioxide to the polydimethylsiloxane in the step (1) is 1: 1.5.
Further preferably, the oxygen-enriched condition in the step (2) means that the volume content of oxygen in the air is 30-40%;
preferably, the oxygen-enriched condition in step (2) means that the volume content of oxygen in the air is 35%.
Further preferably, the weather-resistant composition further comprises a dispersant; the dispersing agent is composed of microcrystalline paraffin and calcium stearate; wherein the weight ratio of the microcrystalline paraffin to the calcium stearate is 2-3: 1.
The inventor further shows in the research that under the condition of a certain dosage of the weather-resistant composition, the dispersing agent plays an important role in further improving the salt spray resistance of the powder coating by the weather-resistant composition; the research shows that: the dispersing agent consisting of microcrystalline paraffin and calcium stearate is added into the weather-resistant composition, so that the salt spray resistance of the powder coating can be further greatly improved; and the salt spray resistance of the powder coating is not obviously improved by adopting other dispersing agents.
Further preferably, the weight ratio of the light stabilizer to the antioxidant to the dispersing agent to the titanium dioxide is 1-3: 1-5: 1-3: 20-40.
Most preferably, the weight ratio of the light stabilizer, the antioxidant, the dispersing agent and the titanium dioxide in the weather-resistant composition is 2:3:2: 30.
Further preferably, the weight of the weather-resistant composition accounts for 20-40% of the total weight of the weather-resistant powder coating raw material.
Preferably, the light stabilizer is bis (2,2',6,6' -tetramethylpiperidyl) sebacate; the antioxidant is pentaerythritol dioctadecyl diphosphite.
Has the advantages that: the invention firstly prepares the powder coating by taking the epoxy resin and/or the polyester resin as the main raw materials, and adds the weather-resistant composition consisting of the light stabilizer, the antioxidant and the titanium dioxide; after the weather-resistant composition is added, the prepared powder coating has certain photo-oxidative aging resistance and salt spray resistance; greatly improves the outdoor weather resistance of the powder coating prepared by taking the epoxy resin and/or the polyester resin as main raw materials.
Detailed Description
The present invention is further explained with reference to the following specific examples, which do not limit the scope of the present invention.
In the following examples, the polyester resin is 9005-6-73 available from Kepler, Shandong; the epoxy resin adopts bisphenol A solid epoxy resin with the trademark of CYD-011(E-20) in the barban petrochemical production; the other raw materials without marked sources are conventional raw materials which can be purchased by the technicians in the field through conventional purchasing approaches; the source of the above raw materials of the present invention does not limit the scope of the present invention.
EXAMPLE 1 preparation of weatherable powder coatings
The raw materials comprise the following components in parts by weight: 40 parts of epoxy resin; 20 parts of polyester resin; 15 parts of filler (precipitated barium sulfate); 3 parts of a curing agent (adipic dihydrazide); 2 parts of a leveling agent (leveling agent PV 88); 20 parts of a weather-resistant composition;
the weather-resistant composition consists of a light stabilizer, an antioxidant and titanium dioxide in a weight ratio of 2:3: 30;
the light stabilizer is bis (2,2',6,6' -tetramethyl piperidyl) sebacate; the antioxidant is pentaerythritol diphosphite dioctadecyl ester;
the preparation method of the weather-resistant powder coating comprises the following steps: and (2) putting the epoxy resin, the polyester resin, the filler, the curing agent, the flatting agent and the weather-resistant composition into a high-speed mixer, uniformly mixing, then extruding by using an extruder to obtain master batches, and then crushing the master batches into powder to obtain the weather-resistant powder coating.
EXAMPLE 2 preparation of weatherable powder coatings
The raw materials comprise the following components in parts by weight: the same as example 1;
the weather-resistant composition consists of a light stabilizer, an antioxidant and modified titanium dioxide in a weight ratio of 2:3: 30;
the light stabilizer and the antioxidant are the same as those in the example 1;
the modified titanium dioxide is prepared by the following method:
(1) uniformly mixing titanium dioxide and polydimethylsiloxane (500 viscosity) to obtain a mixture; wherein the weight ratio of the titanium dioxide to the polydimethylsiloxane is 1: 1.5;
(2) calcining the mixture for 2 hours under the condition that the volume content of oxygen is 35 percent to obtain solid; and grinding the obtained solid product uniformly to obtain the modified titanium dioxide.
The preparation method of the weather-resistant powder coating comprises the following steps: the same as in example 1.
Example 2 differs from example 1 in that the weatherable composition of example 2 employs modified titanium dioxide modified with polydimethylsiloxane instead of titanium dioxide.
EXAMPLE 3 preparation of weatherable powder coating
The raw materials comprise the following components in parts by weight: the same as example 1;
the weather-resistant composition consists of a light stabilizer, an antioxidant, a dispersant and modified titanium dioxide in a weight ratio of 2:3:2: 30;
the light stabilizer and the antioxidant are the same as those in the example 1;
the dispersing agent consists of microcrystalline paraffin and calcium stearate in a weight ratio of 2: 1.
The modified titanium dioxide is prepared by the following method:
(1) mixing titanium dioxide and polydimethylsiloxane (500 viscosity) uniformly to obtain a mixture; wherein the weight ratio of the titanium dioxide to the polydimethylsiloxane is 1: 1.5;
(2) calcining the mixture for 2 hours under the condition that the volume content of oxygen is 35 percent to obtain solid; and grinding the obtained solid product uniformly to obtain the modified titanium dioxide.
The preparation method of the weather-resistant powder coating comprises the following steps: the same as in example 1.
Example 3 differs from example 2 in that a dispersant consisting of microcrystalline paraffin and calcium stearate was added to the weatherable composition of example 3; in example 2, no dispersant was added.
EXAMPLE 4 preparation of weatherable powder coatings
The raw materials comprise the following components in parts by weight: the same as example 1;
the weather-resistant composition consists of a light stabilizer, an antioxidant, a dispersant and modified titanium dioxide in a weight ratio of 2:3:2: 30;
the light stabilizer and the antioxidant are the same as those in the example 1;
the dispersing agent is microcrystalline paraffin.
The preparation method of the modified titanium dioxide is the same as that of the embodiment 3.
The preparation method of the weather-resistant powder coating comprises the following steps: the same as in example 1.
Example 4 differs from example 3 in that the dispersant used in the weatherable composition of example 4 is microcrystalline paraffin; while example 3 used a dispersant consisting of microcrystalline paraffin and calcium stearate.
EXAMPLE 5 preparation of weatherable powder coating
The raw materials comprise the following components in parts by weight: the same as example 1;
the weather-resistant composition consists of a light stabilizer, an antioxidant, a dispersant and modified titanium dioxide in a weight ratio of 2:3:2: 30;
the light stabilizer and the antioxidant are the same as those in the example 1;
the dispersing agent is calcium stearate.
The preparation method of the modified titanium dioxide is the same as that of the embodiment 3.
The preparation method of the weather-resistant powder coating comprises the following steps: the same as in example 1.
Example 5 differs from example 3 in that calcium stearate is used as the dispersant in the weatherable composition of example 5; while example 3 used a dispersant consisting of microcrystalline paraffin and calcium stearate.
EXAMPLE 6 preparation of weatherable powder coating
The raw materials comprise the following components in parts by weight: the same as example 1;
the weather-resistant composition consists of a light stabilizer, an antioxidant, a dispersant and modified titanium dioxide in a weight ratio of 2:3:2: 30;
the light stabilizer and the antioxidant are the same as those in the example 1;
the dispersing agent consists of ethylene-based bis-stearamide and calcium stearate in a weight ratio of 2: 1.
The preparation method of the modified titanium dioxide is the same as that of the embodiment 3.
The preparation method of the weather-resistant powder coating comprises the following steps: the same as in example 1.
Example 6 differs from example 3 in that the dispersant consisting of ethylene bis stearamide and calcium stearate is used in the weatherable composition of example 6; while example 3 used a dispersant consisting of microcrystalline paraffin and calcium stearate.
EXAMPLE 7 preparation of weatherable powder coating
The raw materials comprise the following components in parts by weight: the same as example 1;
the weather-resistant composition consists of a light stabilizer, an antioxidant, a dispersing agent and modified titanium dioxide in a weight ratio of 2:3:2: 30;
the light stabilizer and the antioxidant are the same as those in the example 1;
the dispersing agent consists of microcrystalline paraffin and ethylene bis stearamide in a weight ratio of 2: 1.
The preparation method of the modified titanium dioxide is the same as that of the embodiment 3.
The preparation method of the weather-resistant powder coating comprises the following steps: the same as in example 1.
Example 7 differs from example 3 in that the dispersant comprised of microcrystalline paraffin and ethylene based bis stearamide is used in the weatherable composition of example 7; while example 3 used a dispersant consisting of microcrystalline paraffin and calcium stearate.
Comparative example 1 preparation of powder coating
The raw materials comprise the following components in parts by weight: 40 parts of epoxy resin; 20 parts of polyester resin; 15 parts of filler (precipitated barium sulfate); 3 parts of a curing agent (adipic dihydrazide); 2 parts of a leveling agent (leveling agent PV 88);
the preparation method of the weather-resistant powder coating comprises the following steps: and (2) putting the epoxy resin, the polyester resin, the filler, the curing agent and the flatting agent into a high-speed mixer, uniformly mixing, then extruding by using an extruder to obtain master batches, and then crushing the master batches into powder to obtain the weather-resistant powder coating.
Comparative example 1 differs from example 1 in that no weatherable composition was added to comparative example 1.
Respectively spraying the powder coating prepared in examples 1-7 and the powder coating prepared in proportion 1 on iron plates with the length, width and thickness of 30cm, 20cm and 0.2mm by using an electrostatic spray gun, placing the iron plate to be tested into a salt spray experimental box after the coating is cured, placing the test iron plate at an angle of 25 degrees, spraying according to the spraying amount of 10%, and observing the result after 168 hours; the results are shown in Table 1.
TABLE 1 salt spray resistance test results for weather resistant powder coatings of the present invention
As can be seen from the experiment in Table 1, the powder coating prepared from the epoxy resin and the polyester resin in the comparative example 1 has the coating falling off and the salt spray resistance is poor without adding the weather-resistant composition. However, the weather-resistant composition consisting of the light stabilizer, the antioxidant and the titanium dioxide is added, and only slight falling occurs, so that the falling condition of the coating is improved; this shows that the addition of the weather-resistant composition comprising the light stabilizer, the antioxidant and the titanium dioxide in the process of preparing the powder coating by using the epoxy resin and the polyester resin as raw materials can improve the salt spray resistance of the powder coating.
It can also be seen from the experiments in table 1 that the modified titanium dioxide modified from polydimethylsiloxane by the method of the present invention is used in the weatherable composition described in example 2 in place of titanium dioxide, and the coating layer is only slightly bubbled; this indicates that: the modified titanium dioxide obtained by polydimethylsiloxane through modification by the method of the invention is adopted in the weather-resistant composition to replace titanium dioxide, so that the salt spray resistance of the powder coating can be greatly improved.
As can also be seen from the experiments in table 1, the weatherable composition described in example 3 was further prepared by adding a dispersant consisting of microcrystalline paraffin and calcium stearate; the coating thereof is unchanged; this demonstrates that the dispersant plays an important role in further improving the salt spray resistance of the powder coating for weatherable compositions; the research shows that: the dispersant consisting of microcrystalline paraffin and calcium stearate is added into the weather-resistant composition, so that the salt spray resistance of the powder coating can be further greatly improved.
As can be seen from the experiments in Table 1, the coatings obtained in examples 4-7 after the experiments have slight bubbling as in example 2; this indicates that: the dispersant plays an important role in whether the salt spray resistance of the weather-resistant composition can be further improved; by adopting the weather-resistant composition, the salt spray resistance of the powder coating prepared by taking the epoxy resin and the polyester resin as raw materials can be improved without randomly selecting a dispersing agent or randomly selecting a combination of the dispersing agent; the salt spray resistance of the powder coating prepared by taking the epoxy resin and the polyester resin as raw materials can be further greatly improved only by adding the dispersant consisting of the microcrystalline paraffin and the calcium stearate into the weather-resistant composition.
Claims (12)
1. A weather-resistant powder coating is prepared by taking epoxy resin and/or polyester resin as main raw materials, and is characterized in that a weather-resistant composition is added in the process of preparing the weather-resistant powder coating;
the weatherable composition comprises: light stabilizer, antioxidant and titanium dioxide;
the titanium dioxide is modified titanium dioxide;
the modified titanium dioxide is prepared by the following method:
(1) uniformly mixing titanium dioxide and polydimethylsiloxane to obtain a mixture;
(2) calcining the mixture for 1-3 h under the oxygen-enriched condition to obtain a solid; and grinding the obtained solid product uniformly to obtain the modified titanium dioxide.
2. The weather-resistant powder coating as claimed in claim 1, wherein the weather-resistant composition comprises the light stabilizer, the antioxidant and the titanium dioxide in a weight ratio of 1-3: 1-5: 20-40.
3. The weather-resistant powder coating as claimed in claim 1, wherein the weight ratio of the light stabilizer, the antioxidant and the titanium dioxide in the weather-resistant composition is 2:3: 30.
4. The weather-resistant powder coating as claimed in claim 1, wherein the weight ratio of titanium dioxide to polydimethylsiloxane in step (1) is 1: 1-2.
5. The weather-resistant powder coating as claimed in claim 4, wherein the weight ratio of titanium dioxide to polydimethylsiloxane in step (1) is 1: 1.5.
6. The weather-resistant powder coating as claimed in claim 4, wherein the oxygen-enriched condition in step (2) is that the volume content of oxygen in air is 30-40%.
7. The weatherable powder coating of claim 6, wherein said oxygen-enriched condition in step (2) is 35% by volume of oxygen in the air.
8. The weatherable powder coating of claim 1, further comprising a dispersant in said weatherable composition; the dispersing agent is composed of microcrystalline paraffin and calcium stearate; wherein the weight ratio of the microcrystalline paraffin to the calcium stearate is 2-3: 1.
9. The weather-resistant powder coating as claimed in claim 1, wherein the weather-resistant composition comprises the light stabilizer, the antioxidant, the dispersant and the titanium dioxide in a weight ratio of 1-3: 1-5: 1-3: 20-40.
10. The weatherable powder coating of claim 9, wherein the weatherable composition comprises the light stabilizer, the antioxidant, the dispersant, and the titanium dioxide in a weight ratio of 2:3:2: 30.
11. The weatherable powder coating of claim 1, wherein the weatherable composition is present in an amount of 20% to 40% by weight based on the total weight of the weatherable powder coating raw materials.
12. The weatherable powder coating of claim 1 wherein said light stabilizer is bis (2,2',6,6' -tetramethylpiperidinyl) sebacate; the antioxidant is pentaerythritol dioctadecyl diphosphite.
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| CN202111303608.8A CN113956747B (en) | 2021-11-05 | 2021-11-05 | Weather-resistant powder coating |
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| CN202111303608.8A CN113956747B (en) | 2021-11-05 | 2021-11-05 | Weather-resistant powder coating |
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| CN116102952B (en) * | 2022-12-30 | 2023-11-28 | 江门市皇宙实业有限公司 | Salt spray resistant powder coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE59810298D1 (en) * | 1997-02-05 | 2004-01-15 | Ciba Sc Holding Ag | Stabilizers for powder coatings |
| GB9814519D0 (en) * | 1998-07-03 | 1998-09-02 | Courtaulds Coatings Holdings | Powder coating compositions |
| JP2005220208A (en) * | 2004-02-05 | 2005-08-18 | Asahi Kasei Chemicals Corp | Method for manufacturing curable composition |
| EP1700825A1 (en) * | 2004-12-23 | 2006-09-13 | Degussa AG | Surface and structure modified titanium dioxide |
| CN106189368A (en) * | 2016-06-30 | 2016-12-07 | 无锡市华东电力设备有限公司 | Modified titanium, the preparation method of ultra-fine crystal form ceramic powder denitrating catalyst |
| CN107400444A (en) * | 2017-09-19 | 2017-11-28 | 江南载福粉末涂料（张家港）有限公司 | Epoxy low temperature cured powder coating and preparation method thereof |
| CN112852252A (en) * | 2020-12-25 | 2021-05-28 | 上海邦中新材料有限公司 | Special powder coating for household appliances and preparation method thereof |
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Denomination of invention: A weather resistant powder coating Effective date of registration: 20230301 Granted publication date: 20220524 Pledgee: Bank of China Limited by Share Ltd. Jiangmen branch Pledgor: JIANGMEN HUANGZHOU INDUSTRIAL CO.,LTD. Registration number: Y2023980033773 |