CN110746858A - Flatting agent for epoxy resin powder coating - Google Patents
Flatting agent for epoxy resin powder coating Download PDFInfo
- Publication number
- CN110746858A CN110746858A CN201911189346.XA CN201911189346A CN110746858A CN 110746858 A CN110746858 A CN 110746858A CN 201911189346 A CN201911189346 A CN 201911189346A CN 110746858 A CN110746858 A CN 110746858A
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- CN
- China
- Prior art keywords
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- epoxy resin
- resin powder
- powder coating
- flatting agent
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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
- 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
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/42—Gloss-reducing agents
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The flatting agent for the epoxy resin powder coating is characterized by comprising the following components in parts by mass: 40-80 parts of acrylic resin, 8-10 parts of dicyandiamide, 20-30 parts of polyester, 3-5 parts of chitin nanowhiskers, 1-3 parts of nano silicon dioxide, 0.1-0.5 part of dimethyl imidazoline and 0.2-0.5 part of polyether siloxane copolymer; pulverizing the above materials respectively, sieving by classification, mixing in a mixing bowl, and oven drying at 60-90 deg.C. The invention has low extinction gloss and stable gloss, mainly has the gloss within 3 percent, and has little influence on the gloss by furnace temperature and other systems.
Description
Technical Field
The invention relates to the field of powder coatings, in particular to a flatting agent for an epoxy resin powder coating.
Background
In the face of increasingly severe environmental conditions and the increasing awareness of people about their health, traditional oil-based coatings are slowly released to the market, and the ratio of powder coatings to water-based coatings is gradually increased.
The paint market is classified into various types, and the paint can be divided into indoor powder and outdoor powder according to the application range; according to the raw materials, the paint can be divided into mixed powder paint, pure polyester powder paint, polyurethane type paint and the like; according to the surface, the flour can be divided into plain flour and texture flour, and the plain flour can be divided into high gloss, matte and dull flour. Plain flour is the most common system in powder coatings, wherein high gloss powder and matte powder are better prepared, high gloss powder is prepared without any auxiliary agent, and the matte requirement can be easily met by adding a proper amount of matting auxiliary agent, but the matte powder has certain difficulty that the gloss is within 5 percent.
The most mature product in the market at present is B68 extinction curing agent, the main mechanism is that pyromellitic acid (anhydride) reacts with 2-phenyl imidazoline to serve as epoxy resin serving as a curing agent, and the two curing agents successively participate in the reaction in the curing process to form different reaction rates, so that the extinction effect is generated. The preparation method of B68 is that pyromellitic acid and 2-phenyl imidazoline are dissolved in solvents such as water, and the mixture is put into a thermostatic water bath for a plurality of hours under the condition of 78 ℃, and after a plurality of hours, the turbid solution is filtered, washed once by ethanol, and recrystallized to obtain the product. This process produces a large amount of waste water, which is not environmentally acceptable. Moreover, the B68 extinction system has the disadvantages of poor mechanical properties and yellowing during baking, which are also needed to be improved. Particularly, when the powder coating is baked in a gas furnace, the coating layer of the powder coating after being cured is seriously yellowed due to the existence of nitrogen oxide in the process, and the luster fluctuates, so that the powder coating has certain limitation.
Disclosure of Invention
The invention provides a delustering agent, which is used for solving the problems of poor mechanical property and baking yellowing of a delustering auxiliary agent in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: a flatting agent for epoxy resin powder coating and a preparation method of the powder coating are disclosed, wherein the flatting agent comprises the following components in parts by mass;
40-80 parts of acrylic resin, 8-10 parts of dicyandiamide, 20-30 parts of polyester, 3-5 parts of chitin nanowhiskers, 1-3 parts of nano silicon dioxide, 0.1-0.5 part of dimethyl imidazoline and 0.2-0.5 part of polyether siloxane copolymer.
Further, the raw materials also comprise at least one of styrene-acrylic resin and alkyd resin.
Further, the raw material also comprises 5-10 parts of sebacic acid dihydrazide.
Furthermore, the raw material also comprises 0.001-0.01 part of diethyl imidazoline.
Further, the dicyandiamide is ultrafine dicyandiamide. The mixing ratio of the styrene-acrylic resin to the alkyd resin is 1:1
According to another aspect of the present invention, there is provided an epoxy resin powder coating comprising a matting agent using any one of the matting agents of claims 1 to 5.
During production, the components are respectively crushed, graded and sieved, then fully mixed in a mixing tank, and finally dried at 60-90 ℃ to prepare the high-performance concrete.
The invention has the following advantages:
1. the extinction gloss is low, the gloss is stable, the gloss is mainly within 3 percent, and the influence of furnace temperature and other systems on the gloss is small;
2. compared with a B68 flatting agent, the mechanical property is greatly improved, and the flatting agent is free from baking and yellowing;
3. compared with a semi-chemical flatting agent, the baking stability is better, and the baking in a cold furnace can be realized without influencing the glossy surface.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible.
Example 1:
the flatting agent is prepared from 73 parts of acrylic resin, 17 parts of polyester, 9.7 parts of dicyandiamide, 5 parts of chitin nanowhiskers, 2 parts of nano silicon dioxide, 0.2 part of polyether siloxane copolymer and 0.3 part of dimethyl imidazole by crushing the components respectively, sieving the crushed components in a grading manner, fully mixing the crushed components in a mixing cylinder, and finally drying the mixed components at 60-90 ℃ to obtain the flatting agent.
Example 2:
the flatting agent is prepared from 46 parts of acrylic resin, 17 parts of polyester, 8 parts of superfine dicyandiamide, 4 parts of chitin nanowhiskers, 1 part of nano silicon dioxide, 0.3 part of polyether siloxane copolymer and 0.4 part of dimethyl imidazole by crushing the components respectively, sieving the crushed components in a grading manner, fully mixing the crushed components in a mixing cylinder, and finally drying the mixed components at 60-90 ℃ to obtain the flatting agent.
Example 3:
the flatting agent is prepared from 60 parts of acrylic resin, 28 parts of polyester, 10 parts of dicyandiamide, 3 parts of chitin nanowhiskers, 3 parts of nano silicon dioxide, 0.4 part of polyether siloxane copolymer and 0.2 part of dimethyl imidazole by crushing the components respectively, sieving in a grading manner, fully mixing in a mixing tank, and finally drying at 60-90 ℃ to obtain the flatting agent.
Example 4:
the flatting agent is prepared from 73 parts of acrylic resin, 17 parts of polyester, 9.7 parts of superfine dicyandiamide, 5 parts of chitin nanowhisker, 2 parts of nano-silica, 0.2 part of polyether siloxane copolymer and 0.3 part of dimethyl imidazole, and 20 parts of alkyd resin, 6 parts of sebacic acid dihydrazide and 0.005 part of diethyl imidazoline are additionally added, the components are respectively crushed, graded and sieved, then fully mixed in a mixing tank, and finally dried at 60-90 ℃ to prepare the flatting agent.
Example 5: the matting agent is prepared by adopting 60 parts of acrylic resin, 28 parts of polyester, 10 parts of superfine dicyandiamide, 3 parts of chitin nanowhiskers, 3 parts of nano silicon dioxide, 0.4 part of polyether siloxane copolymer and 0.2 part of dimethyl imidazole, and additionally adding 20 parts of phenylpropane resin, 6 parts of sebacic acid dihydrazide and 0.005 part of diethyl imidazoline, crushing all the materials respectively, then carrying out grading sieving, and then fully mixing in a mixing tank to obtain the matting agent.
Example 6: the flatting agent is prepared by adopting 60 parts of acrylic resin, 28 parts of polyester, 10 parts of superfine dicyandiamide, 3 parts of chitin nano crystal whisker, 3 parts of nano silicon dioxide, 0.4 part of polyether siloxane copolymer and 0.2 part of dimethyl imidazole, and additionally adding 10 parts of phenylpropyl resin, 10 parts of alkyd resin, 6 parts of sebacic acid dihydrazide and 0.005 part of diethyl imidazoline, crushing all the materials respectively, grading and sieving, and then fully mixing in a mixing tank to obtain the flatting agent.
Table 1: test formulations
As shown in the table above, the parts in the table are parts by mass, and five coatings were obtained by using the six examples of the matting agent of the present invention with B68 matting agent (comparative example 1) and semichemical matting agent (comparative example 2) in epoxy resin powder coatings, respectively. The production process comprises the following steps: extruding the material at 100-110 ℃ by a double-screw extruder at the main machine rotating speed of 35r/min, grinding into powder, electrostatically spraying the powder on a test board, and baking the test board in an oven at 180 ℃ for 15 minutes.
The test is carried out according to national standards (GB/T6739-1996, GB6742-86, GB/T9286-1998, GB/T1732-93, GB9753-88, GB/T1771-91 and the like), and the related performance indexes of the test panel are as follows.
Table 2: comparative test
Through tests, compared with the B68 delustering agent, the delustering agent adopted by the invention improves the mechanical property of the epoxy resin powder coating obtained in the embodiments 1-6, wherein the shock resistance is obviously improved so as to achieve the aim that the positive and negative impact is greater than 47 kg/cm2The ratio of the two pairs is 10 to 30 percent higher. Compared with a semi-chemical flatting agent, the flatting agent adopted by the invention has better baking stability and no baking yellowing. The cold furnace baking can be realized without influencing the glossy surface.
The surface of B68 was slightly rougher in the surface smoothness of the board, and the surface smoothness of the coatings produced from the matting agents obtained in examples 4 to 6 was the best of the five.
Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. The flatting agent for the epoxy resin powder coating is characterized by comprising the following components in parts by mass;
40-80 parts of acrylic resin, 8-10 parts of dicyandiamide, 20-30 parts of polyester, 3-5 parts of chitin nanowhiskers, 1-3 parts of nano silicon dioxide, 0.1-0.5 part of dimethyl imidazoline and 0.2-0.5 part of polyether siloxane copolymer; pulverizing the above materials respectively, sieving by classification, mixing in a mixing bowl, and oven drying at 60-90 deg.C.
2. A matting agent for epoxy resin powder paint according to claim 1, further comprising at least one of styrene-acrylic resin and alkyd resin.
3. A matting agent for epoxy resin powder coating according to claim 1, characterized in that the matting agent further comprises 5-10 parts of sebacic acid dihydrazide.
4. A matting agent for epoxy resin powder coating according to claim 1, further comprising 0.001-0.01 parts of diethylimidazoline.
5. A matting agent for epoxy resin powder paint as claimed in claim 1, wherein said dicyandiamide is ultra-fine dicyandiamide.
6. A matting agent for epoxy resin powder paint as claimed in claim 1, wherein the proportion of the styrene-acrylic resin and alkyd resin is 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189346.XA CN110746858A (en) | 2019-11-28 | 2019-11-28 | Flatting agent for epoxy resin powder coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189346.XA CN110746858A (en) | 2019-11-28 | 2019-11-28 | Flatting agent for epoxy resin powder coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110746858A true CN110746858A (en) | 2020-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911189346.XA Pending CN110746858A (en) | 2019-11-28 | 2019-11-28 | Flatting agent for epoxy resin powder coating |
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| Country | Link |
|---|---|
| CN (1) | CN110746858A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316662A (en) * | 2021-12-31 | 2022-04-12 | Ppg涂料(天津)有限公司 | Aqueous matt paste and coating composition prepared therefrom |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0247168A (en) * | 1988-08-09 | 1990-02-16 | Dainichiseika Color & Chem Mfg Co Ltd | Powder coating composition |
| CN102268203A (en) * | 2011-06-23 | 2011-12-07 | 宁波南海化学有限公司 | Flatting agent for epoxy-polyester powder paint and preparation method thereof |
-
2019
- 2019-11-28 CN CN201911189346.XA patent/CN110746858A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0247168A (en) * | 1988-08-09 | 1990-02-16 | Dainichiseika Color & Chem Mfg Co Ltd | Powder coating composition |
| CN102268203A (en) * | 2011-06-23 | 2011-12-07 | 宁波南海化学有限公司 | Flatting agent for epoxy-polyester powder paint and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 张俊甫: "《精细化工概论》", 31 October 1991, 中央广播电视大学出版社 * |
| 董祥忠: "《现代塑料成型工程》", 30 September 2009, 国防工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316662A (en) * | 2021-12-31 | 2022-04-12 | Ppg涂料(天津)有限公司 | Aqueous matt paste and coating composition prepared therefrom |
| CN114316662B (en) * | 2021-12-31 | 2023-08-29 | Ppg涂料(天津)有限公司 | Aqueous matting slurries and coating compositions made therefrom |
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Application publication date: 20200204 |