A matting agent for powder coatings, its preparation method and use

Abstract

The application provides a matt agent for powder coating and a preparation method and application thereof, and belongs to the technical field of powder coating.The matt agent for powder coating is an inorganic-organic modified matt agent, and the preparation method comprises the following steps: 20g of 2-phenylimidazoline phthalic acid is dissolved in 100mL of dimethyl sulfoxide, then 40g of SiO2 loaded perfluoro organic acid is added, stirring is carried out at 50-60 DEG C for 5-8h, a blended liquid is obtained, and the blended liquid is subjected to suction filtration, washed with dimethyl sulfoxide for 3 times, and the filtered product is dried to obtain the inorganic-organic modified matt agent.The inorganic-organic modified matt agent is used for preparing an epoxy polyester mixed resin system powder coating, and the epoxy polyester mixed resin system powder coating comprises the following components in parts by weight: 80-84 parts of polyester resin, 170-176 parts of epoxy resin, 4-5 parts of powder leveling agent, 2.5-3 parts of carbon black, 4-5 parts of barite powder, 1.8-2 parts of benzoin and 27-30 parts of the inorganic-organic modified matt agent.The matt agent prepared by the application has excellent matt performance in the epoxy polyester mixed resin system.

Description

Technical Field

[0001] This invention belongs to the field of powder coating technology, specifically relating to a matting agent for powder coatings, its preparation method, and its application. Background Technology

[0002] Powder coatings are solvent-free, 100% solid powder coatings characterized by being solvent-free, pollution-free, recyclable, environmentally friendly, energy-saving and resource-efficient, reducing labor intensity, and providing high mechanical strength of the coating film. The coating is prepared by mixing special resins, pigments, fillers, curing agents, and other additives in a specific ratio, followed by processes such as hot extrusion, pulverization, and sieving. Powder coatings can be applied to the surface of the substrate using various methods such as electrostatic spraying and fluidized bed dipping. Afterward, they need to be baked to melt and level the surface, and finally cured into a film. Its advantages include 100% film-forming efficiency, no solvent pollution, low energy consumption, 100% recycling of oversprayed powder, and excellent coating performance. Due to its environmental advantages, powder coatings are widely used in various industries such as architectural aluminum profiles, HVAC, heavy-duty corrosion protection, home appliances, automobiles, and agricultural machinery.

[0003] Powder coating matting agents are additives specifically designed to reduce the gloss of powder coating surfaces. They help achieve specific decorative effects and generally fall into the following categories: Physical matting agents; these agents primarily achieve a matting effect by physically disrupting the smoothness of the coating surface, such as by adding fillers or incompatible substances. Commonly used physical matting agents include ultrafine silica, talc, and stearates. Chemical matting agents; these agents interact with the resin through chemical reactions, altering the surface state of the coating to achieve a matting effect. These agents often provide lower gloss but may be prone to yellowing. Special resin-based matting agents; certain resins with specific functional groups, such as polymethyl urea resin, can be added to powder coatings as matting agents to achieve a low-gloss effect through chemical reactions.

[0004] For example, Chinese invention patent CN109354970A discloses an indoor two-component powder coating and its preparation method. One component of this powder coating, pyromellitic acid-2-phenylimidazoline monosalt, is an organic compound formed by the reaction of pyromellitic acid and 2-phenylimidazoline. In the chemical synthesis, pyromellitic acid and 2-phenylimidazoline react in an equimolar ratio, forming the monosalt through an acid-base neutralization reaction. This monosalt can be used as a matting agent in powder coatings to adjust the gloss of the coating film.

[0005] However, while pyromellitic 2-phenylimidazoline monosalt provides excellent matting effects when used as a matting agent in powder coatings, it requires a pure epoxy system. When epoxy prices are high, polyester is often introduced into the system to reduce costs, which degrades the matting effect. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention provides a matting agent for powder coatings, its preparation method and application, ensuring that the prepared matting agent has excellent matting performance in epoxy polyester mixed resin systems.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a method for preparing a matting agent for powder coatings, wherein the matting agent for powder coatings is an inorganic-organic modified matting agent, comprising the following steps:

[0008] A1. SiO2-loaded perfluorinated organic acids were prepared by impregnation method.

[0009] A2. Pyromellitic acid and 2-phenylimidazoline were mixed in a solvent to prepare pyromellitic acid-2-phenylimidazoline.

[0010] A3. Dissolve 20g of pyromellitic acid-2-phenylimidazoline obtained from A2 in 100mL of dimethyl sulfoxide, then add 40g of SiO2-supported perfluorinated organic acid obtained from A1, and stir at 50-60℃ for 5-8h to obtain a blend.

[0011] A4. The blend obtained in A3 is filtered and washed three times with dimethyl sulfoxide. The filtrates are combined and dried in a vacuum drying oven to obtain the inorganic-organic modified matting agent.

[0012] Furthermore, in A1, the preparation steps of the SiO2-supported perfluorinated organic acid are as follows:

[0013] A11. Calcine nano-SiO2 at 500-550℃ for 1-1.5h to obtain activated SiO2;

[0014] A12. Prepare a 20% (w / w) acid solution from a perfluorinated organic acid using ethanol;

[0015] A13. Add the activated SiO2 obtained in A11 to the acid solution obtained in A12, reflux and stir at 75-80℃ for 20h, vacuum filter, and dry to obtain SiO2-supported perfluorinated organic acid.

[0016] Furthermore, in A13, the mass ratio of the activated SiO2 to the acid solution is 1:5-7.

[0017] Furthermore, the perfluoroorganic acid is perfluorohexanoic acid or perfluoroheptanoic acid.

[0018] Furthermore, in A2, the preparation steps of the pyromellitic acid-2-phenylimidazoline are as follows:

[0019] A21. Weigh 0.01 mol of pyromellitic acid and 2-phenylimidazoline respectively, and dissolve them in 100 mL of ethanol until clear, to obtain pyromellitic acid ethanol solution and 2-phenylimidazoline ethanol solution.

[0020] A22. Pour the pyromellitic acid ethanol solution and 2-phenylimidazoline ethanol solution obtained in A21 into a three-necked round-bottom flask, place it in a constant temperature water bath at 78°C, and use a spherical condenser to cool and reflux the evaporated solvent for 3 hours to obtain a turbid liquid.

[0021] A23. The turbid liquid obtained in A22 is filtered by suction, washed three times with ethanol, the filtrate is recrystallized, the mother liquor is recovered, and the filtrate is dried in a cool and ventilated place to obtain pyromellitic acid-2-phenylimidazoline.

[0022] Secondly, the present invention provides a matting agent for powder coatings, which is prepared by the above-described preparation method.

[0023] Thirdly, the present invention provides an application of a matting agent for powder coatings, wherein the matting agent for powder coatings is prepared by the above-described preparation method and is used to prepare an epoxy polyester mixed resin system powder coating. The epoxy polyester mixed resin system powder coating comprises, by weight, the following components: 80-84 parts polyester resin, 170-176 parts epoxy resin, 4-5 parts powder leveling agent, 2.5-3 parts carbon black, 4-5 parts barite powder, 1.8-2 parts benzoin, and 27-30 parts inorganic-organic modified matting agent.

[0024] Furthermore, the polyester resin is Hangzhou Zhongfa 5086A polyester or Bestway YZ9802 polyester resin.

[0025] Furthermore, the epoxy resin is E-12 epoxy resin.

[0026] This application has the following beneficial effects:

[0027] 1. This invention provides an inorganic-organic modified matting agent that combines the advantages of inorganic substances (such as SiO2) and organic compounds (such as perfluorohexanoic acid and pyromellitic acid-2-phenylimidazoline), offering better surface roughness and optical properties. SiO2, as a carrier, has a high specific surface area, which helps to uniformly disperse the matting agent, allowing it to exert its matting effect more effectively. The introduction of perfluorohexanoic acid can reduce surface energy, thereby reducing light reflection and scattering and improving the matting effect. The introduction of pyromellitic acid-2-phenylimidazoline, with its structure, helps to improve compatibility and interaction with the resin system, thus affecting the surface morphology of the coating and further enhancing the matting effect. The introduction of perfluorohexanoic acid and pyromellitic acid-2-phenylimidazoline has a synergistic effect in improving the matting effect.

[0028] 2. In the preparation of SiO2-loaded perfluorinated organic acids, the dispersibility of nano-SiO2 particles in the resin is improved after being modified by perfluorinated organic acids. The perfluorinated organic acid particles on the SiO2-loaded coating can cause tiny unevenness on the surface. This microscopic unevenness causes the incident light to be scattered, reducing the proportion of reflected light, thus making the coating exhibit a lower gloss and achieving a matting effect. In addition, the introduction of perfluorinated organic acids may also affect the refractive index of the coating, further enhancing the matting performance.

[0029] 3. Due to its unique chemical structure, pyromellitic acid-2-phenylimidazoline can exhibit compatibility and interaction with resin systems, thereby altering the surface morphology of the coating. This alteration includes not only an increase in surface roughness but may also include changes in the curing process and network structure formation at the microscopic level, thus enhancing matting properties. Attached Figure Description

[0030] Figure 1 This is a comparison trend diagram of the gloss of the epoxy polyester mixed resin powder coatings prepared in Examples 1-6 and Comparative Examples 1-4 of the present invention. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the embodiments.

[0032] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0033] Example 1: An epoxy polyester mixed resin system powder coating, by weight, comprises the following components: 82 parts polyester resin, 174 parts epoxy resin, 4.5 parts powder leveling agent, 2.8 parts carbon black, 4.5 parts barite powder, 1.9 parts benzoin and 28 parts inorganic-organic modified matting agent.

[0034] The polyester resin used is Hangzhou Sino-French epoxy curing system polyester, specifically the 5:5 ring-polymer resin 5086A. The epoxy resin is Shenzhen Yoshida E-12 epoxy resin. The powder leveling agent is Dexinli PV88 powder leveling agent. The carbon black is Mitsubishi MA100 carbon black. The barite powder is Changxing Innovation 1800 mesh ultrafine barium sulfate.

[0035] The preparation method of inorganic-organic modified matting agents includes the following steps:

[0036] A1. Perfluorohexanoic acid was prepared by impregnation method to support perfluorohexanoic acid, and SiO2-supported perfluorohexanoic acid was obtained.

[0037] A2. Pyromellitic acid and 2-phenylimidazoline were mixed in a solvent to prepare pyromellitic acid-2-phenylimidazoline.

[0038] A3. Dissolve 20g of pyromellitic acid-2-phenylimidazoline obtained from A2 in 100mL of dimethyl sulfoxide, then add 40g of perfluorohexanoic acid supported on SiO2 obtained from A1, and stir at about 55℃ for 5-8h to obtain a blend.

[0039] A4. The blend obtained in A3 is filtered and washed three times with dimethyl sulfoxide. The filtrates are combined and dried in a vacuum drying oven to obtain the inorganic-organic modified matting agent.

[0040] Dimethyl sulfoxide is the standard type of Xingfa's premium grade product.

[0041] In A1, the preparation steps of SiO2-supported perfluorohexanoic acid are as follows:

[0042] A11. Calcine nano-SiO2 at about 520℃ for 1.2h to obtain activated SiO2.

[0043] A12. Prepare a 20% (w / w) acid solution of perfluorohexanoic acid using ethanol.

[0044] A13. Add the activated SiO2 obtained in A11 to the acid solution obtained in A12. The mass ratio of activated SiO2 to acid solution is 1:6. Stir under constant temperature at about 78℃ for 20 hours, filter under vacuum, and dry to obtain SiO2-supported perfluorohexanoic acid.

[0045] Nano-SiO2 was purchased from Jinan Kason Chemical Co., Ltd. Perfluorohexanoic acid was a premium industrial-grade product from Carnos.

[0046] In A2, the preparation steps of the pyromellitic acid-2-phenylimidazoline are as follows:

[0047] A21. Weigh 0.01 mol of pyromellitic acid and 2-phenylimidazoline respectively, and dissolve them in 100 mL of ethanol until clear, to obtain pyromellitic acid ethanol solution and 2-phenylimidazoline ethanol solution.

[0048] A22. Pour the pyromellitic acid ethanol solution and 2-phenylimidazoline ethanol solution obtained in A21 into a three-necked round-bottom flask, place it in a constant temperature water bath at 78°C, and use a spherical condenser to cool and reflux the evaporated solvent for 3 hours to obtain a turbid liquid.

[0049] A23. The turbid liquid obtained in A22 is filtered by suction, washed three times with ethanol, the filtrate is recrystallized, the mother liquor is recovered, and the filtrate is dried in a cool and ventilated place to obtain pyromellitic acid-2-phenylimidazoline.

[0050] Pyromellitic acid was purchased from Jia Huixingcheng Industrial Grade. 2-Phenylidene imidazoline was purchased from Shandong Haizhou Bioengineering Co., Ltd., with a purity of 99%.

[0051] Example 2: The only difference between this example and Example 1 is that: an epoxy polyester mixed resin system powder coating, by weight, includes the following components: 84 parts polyester resin, 176 parts epoxy resin, 5 parts powder leveling agent, 3 parts carbon black, 5 parts barite powder, 2 parts benzoin and 30 parts inorganic-organic modified matting agent.

[0052] Example 3: The only difference between this example and Example 1 is that: an epoxy polyester mixed resin system powder coating, by weight, includes the following components: 80 parts polyester resin, 170 parts epoxy resin, 4 parts powder leveling agent, 2.5 parts carbon black, 4 parts barite powder, 1.8 parts benzoin and 27 parts inorganic-organic modified matting agent.

[0053] Example 4: The only difference between this example and Example 1 is that: an epoxy polyester mixed resin system powder coating, by weight, includes the following components: 83 parts polyester resin, 175 parts epoxy resin, 4.2 parts powder leveling agent, 2.6 parts carbon black, 4.2 parts barite powder, 1.8 parts benzoin and 28 parts inorganic-organic modified matting agent.

[0054] Example 5: The only difference between this example and Example 1 is that the mass ratio of activated SiO2 to acid solution is different in the preparation of SiO2-supported perfluorohexanoic acid.

[0055] Specifically, the preparation steps of SiO2-supported perfluorohexanoic acid are as follows:

[0056] A11. Calcine nano-SiO2 at about 520℃ for 1.2h to obtain activated SiO2.

[0057] A12. Prepare a 20% (w / w) acid solution of perfluorohexanoic acid using ethanol.

[0058] A13. Add the activated SiO2 obtained in A11 to the acid solution obtained in A12. The mass ratio of activated SiO2 to acid solution is 1:5. Stir under constant temperature at about 78℃ for 20 hours, filter under vacuum, and dry to obtain SiO2-supported perfluorohexanoic acid.

[0059] Example 6: The only difference between this example and Example 1 is that the mass ratio of activated SiO2 to acid solution is different in the preparation of SiO2-supported perfluorohexanoic acid.

[0060] Specifically, the preparation steps of SiO2-supported perfluorohexanoic acid are as follows:

[0061] A11. Calcine nano-SiO2 at about 520℃ for 1.2h to obtain activated SiO2.

[0062] A12. Prepare a 20% (w / w) acid solution of perfluorohexanoic acid using ethanol.

[0063] A13. Add the activated SiO2 obtained in A11 to the acid solution obtained in A12. The mass ratio of activated SiO2 to acid solution is 1:7. Reflux and stir at a constant temperature of about 78°C for 20 hours. Filter under vacuum and dry to obtain SiO2-supported perfluorohexanoic acid.

[0064] Comparative Example 1: The only difference between this comparative example and Example 1 is that in the preparation of the inorganic-organic modified matting agent, SiO2-supported perfluorohexanoic acid is replaced with nano-SiO2.

[0065] Specifically, the preparation method of the inorganic-organic modified matting agent includes the following steps:

[0066] A1. Prepare nano-SiO2.

[0067] A2. Pyromellitic acid and 2-phenylimidazoline were mixed in a solvent to prepare pyromellitic acid-2-phenylimidazoline.

[0068] A3. Dissolve 20g of pyromellitic acid-2-phenylimidazoline obtained in A2 in 100mL of dimethyl sulfoxide, then add 40g of nano-SiO2, and stir at about 55℃ for 5-8h to obtain a blend.

[0069] A4. The blend obtained in A3 is filtered and washed three times with dimethyl sulfoxide. The filtrates are combined and dried in a vacuum drying oven to obtain the inorganic-organic modified matting agent.

[0070] Comparative Example 2: The only difference between this comparative example and Example 1 is that the inorganic-organic modified matting agent is replaced with SiO2-supported perfluorohexanoic acid.

[0071] Specifically, an epoxy-polyester mixed resin system powder coating comprises, by weight, the following components: 82 parts polyester resin, 174 parts epoxy resin, 4.5 parts powder leveling agent, 2.8 parts carbon black, 4.5 parts barite powder, and 28 parts SiO2-supported perfluorohexanoic acid. The preparation method of the SiO2-supported perfluorohexanoic acid is the same as in Example 1.

[0072] Comparative Example 3: The only difference between this comparative example and Example 1 is that the inorganic-organic modified matting agent is replaced with pyromellitic acid-2-phenylimidazoline.

[0073] Specifically, an epoxy-polyester mixed resin powder coating comprises, by weight, the following components: 82 parts polyester resin, 174 parts epoxy resin, 4.5 parts powder leveling agent, 2.8 parts carbon black, 4.5 parts barite powder, and 28 parts pyromellitic acid-2-phenylimidazolinic acid. The preparation method of pyromellitic acid-2-phenylimidazolinic acid is the same as in Example 1.

[0074] Comparative Example 4: The only difference between this comparative example and Example 1 is that the inorganic-organic modified matting agent is replaced with nano-SiO2.

[0075] Specifically, an epoxy-polyester mixed resin system powder coating comprises the following components by weight: 82 parts polyester resin, 174 parts epoxy resin, 4.5 parts powder leveling agent, 2.8 parts carbon black, 4.5 parts barite powder, and 28 parts nano SiO2.

[0076] Experimental Example: Test Subjects: Powder coatings of epoxy polyester mixed resin system prepared in Examples 1-6 and Comparative Examples 1-3.

[0077] Extrusion conditions: The powder coating is mixed and processed using a twin-screw extruder. The temperature in Zone I is set to 95°C, and the temperature in Zone II is set to 105°C. During the extrusion process, the material will be heated at a gradually increasing temperature to ensure full melting and mixing.

[0078] Sample substrate: 0.5mm thick galvanized sheet is used as the coating substrate. The substrate is degreased to remove surface grease and contaminants, ensuring good adhesion between the coating and the substrate; coating thickness is 70-90μm.

[0079] Baking conditions: The electric oven is set to 190℃ and held for 13 minutes (from the time the sample enters the oven until it exits).

[0080] Test items and standards: Gloss (%@60°) - GB / T 9754-2007; Appearance - GB / T21776-2008.

[0081] Experimental results: see Table 1.

[0082] Table 1. Test data for the experimental cases

[0083] Gloss (% @ 60°) Coating appearance Example 1 3.2 Smooth and delicate Example 2 3.5 Smooth and delicate Example 3 3.3 Smooth and delicate Example 4 3.2 Smooth and delicate Example 5 3.2 Smooth and delicate Example 6 3.3 Smooth and delicate Comparative Example 1 4.4 Smooth and delicate Comparative Example 2 8.0 Smooth and delicate Comparative Example 3 6.2 Smooth and delicate Comparative Example 4 11.5 Local sand texture

[0084] Results Analysis: Analyze Examples 1-6 and combine the data in Table 1 and... Figure 1 It can be seen that the epoxy polyester mixed resin system powder coating prepared by the present invention can reduce the gloss of the coating film to below 3.5%@60°.

[0085] Analysis of Example 1 and Comparative Examples 1-4, combined with data from Table 1 and Figure 1 It can be seen that when the inorganic-organic modified matting agent is directly replaced with nano-SiO2 (Comparative Example 4), the epoxy polyester mixed resin system powder coating has a film gloss of 11.5%@60°; when the inorganic-organic modified matting agent is replaced with SiO2-supported perfluorohexanoic acid (Comparative Example 2), the epoxy polyester mixed resin system powder coating has a film gloss of 8.0%@60°; indicating that the introduction of perfluorohexanoic acid can further enhance the matting performance.

[0086] When the inorganic-organic modified matting agent was replaced with pyromellitic acid-2-phenylimidazoline (Comparative Example 3), an epoxy polyester mixed resin system powder coating was prepared, with a film gloss of 6.2%@60°. When the SiO2-loaded perfluorohexanoic acid was replaced with nano-SiO2 in the preparation of the inorganic-organic modified matting agent (Comparative Example 1), that is, nano-SiO2 combined with pyromellitic acid-2-phenylimidazoline, an epoxy polyester mixed resin system powder coating was prepared, with a film gloss of 4.4%@60°. This shows that the introduction of pyromellitic acid-2-phenylimidazoline can also further enhance the matting performance.

[0087] Example 1 prepared an epoxy polyester mixed resin system powder coating with a film gloss of 3.2%@60°. It can be seen that, with SiO2 as the carrier, the introduction of perfluorohexanoic acid and pyromellitic acid-2-phenylimidazoline can work synergistically to enhance the matting performance.

[0088] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0089] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for preparing a matting agent for powder coatings, characterized in that, The matting agent for powder coatings is an inorganic-organic modified matting agent, comprising the following steps: A1. SiO2-loaded perfluorinated organic acids were prepared by impregnation method. A2. Pyromellitic acid and 2-phenylimidazoline were mixed in a solvent to prepare pyromellitic acid-2-phenylimidazoline. A3. Dissolve 20g of pyromellitic acid-2-phenylimidazoline obtained from A2 in 100mL of dimethyl sulfoxide, then add 40g of SiO2-supported perfluorinated organic acid obtained from A1, and stir at 50-60℃ for 5-8h to obtain a blend. A4. The blend obtained in A3 is filtered and washed three times with dimethyl sulfoxide. The filtrates are combined and dried in a vacuum drying oven to obtain the inorganic-organic modified matting agent. In A2, the preparation steps of the pyromellitic acid-2-phenylimidazoline are as follows: A21. Weigh 0.01 mol of pyromellitic acid and 2-phenylimidazoline respectively, and dissolve them in 100 mL of ethanol until clear, to obtain pyromellitic acid ethanol solution and 2-phenylimidazoline ethanol solution. A22. Pour the pyromellitic acid ethanol solution and 2-phenylimidazoline ethanol solution obtained in A21 into a three-necked round-bottom flask, place it in a constant temperature water bath at 78°C, and use a spherical condenser to cool and reflux the evaporated solvent for 3 hours to obtain a turbid liquid. A23. The turbid liquid obtained in A22 is filtered by suction, washed three times with ethanol, the filtrate is recrystallized, the mother liquor is recovered, and the filtrate is dried in a cool and ventilated place to obtain pyromellitic acid-2-phenylimidazoline.

2. The method for preparing the matting agent for powder coatings according to claim 1, characterized in that, In A1, the preparation steps of the SiO2-supported perfluorinated organic acid are as follows: A11. Calcine nano-SiO2 at 500-550℃ for 1-1.5h to obtain activated SiO2; A12. Prepare a 20% (w / w) acid solution from a perfluorinated organic acid using ethanol; A13. Add the activated SiO2 obtained in A11 to the acid solution obtained in A12, reflux and stir at 75-80℃ for 20h, vacuum filter, and dry to obtain SiO2-supported perfluorinated organic acid.

3. The method for preparing the matting agent for powder coatings according to claim 2, characterized in that, In A13, the mass ratio of activated SiO2 to acid solution is 1:5-7.

4. The method for preparing the matting agent for powder coatings according to claim 2, characterized in that, The perfluoroorganic acid is perfluorohexanoic acid or perfluoroheptanoic acid.

5. A matting agent for powder coatings, characterized in that, It is prepared by the preparation method described in any one of claims 1-4.

6. The application of a matting agent for powder coatings, characterized in that, The matting agent for powder coatings is prepared by the preparation method described in any one of claims 1-4, and is used to prepare epoxy polyester mixed resin system powder coatings. The epoxy polyester mixed resin system powder coatings, by weight, include the following components: 80-84 parts polyester resin, 170-176 parts epoxy resin, 4-5 parts powder leveling agent, 2.5-3 parts carbon black, 4-5 parts barite powder, 1.8-2 parts benzoin, and 27-30 parts inorganic-organic modified matting agent.

7. The application of the matting agent for powder coatings according to claim 6, characterized in that, The polyester resin is either Hangzhou Zhongfa 5086A polyester or Bestway YZ9802 polyester resin.

8. The application of the matting agent for powder coatings according to claim 6, characterized in that, The epoxy resin is E-12 epoxy resin.

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