Organic delustering agent and application thereof in coating ink

Abstract

The invention relates to an organic delustering agent and application thereof in coating ink, the organic delustering agent comprises wax modified silicon dioxide A and wax modified silicon dioxide B. The silicon dioxide A is prepared through a gel method, the pore volume of the silicon dioxide A is 1.5-2 mL / g, the silicon dioxide B is prepared through a precipitation method, and the pore volume of the silicon dioxide B is 0.4-0.8 mL / g. The two kinds of wax modified silicon dioxide are jointly used as the organic matting agent, so that the use of high-cost gel-method silicon dioxide can be reduced while a relatively good matting effect and relatively good wear resistance are obtained, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and particularly to an organic matting agent and its application in coating inks. Background Art

[0002] Matting agents are components used in coating inks, which can reduce the gloss of the coating surface, so that the coating surface presents a matte or matting effect. The principle of the matting agent is that after the coating containing the matting agent is coated to form a coating, the solvent inside the coating gradually volatilizes, the surface of the coating shrinks, and part of the matting agent is exposed on the surface of the coating, thus forming an uneven surface, which can scatter light to produce a matting perception. Matting agents include organic matting agents and inorganic matting agents. Organic matting agents refer to matting agents containing organic substances, such as resins, waxes, etc. Inorganic matting agents include silica and diatomaceous earth. The sources of silica include the gas phase method, the precipitation method, the gel method, etc. Among them, the silica obtained by the gel method has a narrow particle size distribution and a better matting effect. However, its preparation cost is high, and a large amount of silica is required to achieve an ideal matting effect when used as a matting agent. The precipitation method can prepare relatively inexpensive silica. However, its particle size distribution is wide, and the effect of using it as a matting agent is not good, and its coarse particles will affect the touch of the coating.

[0003] How to obtain a matting agent with good matting effect and low cost is an urgent problem to be solved.

[0004] Therefore, it is necessary to provide an organic matting agent and its application in coating inks. Summary of the Invention

[0005] In order to solve the problem that it is difficult for silica matting agents to balance cost, matting effect and wear resistance, the first aspect of the present application provides an organic matting agent.

[0006] An organic matting agent, comprising wax-modified silica A and wax-modified silica B. The silica A is prepared by the gel method, the pore volume of the silica A is 1.5 - 2 mL / g, the silica B is prepared by the precipitation method, and the pore volume of the silica B is 0.4 - 0.8 mL / g.

[0007] This solution uses wax to modify two types of silica, enabling both types of silica to have better dispersibility and not easily settle. Silica A is prepared by the sol-gel method and has a higher pore volume and a corresponding lower apparent density compared to silica B prepared by the precipitation method. Therefore, after applying it to the coating and coating, the wax-modified silica A in the coating tends to be distributed on the coating surface more than the wax-modified silica B. Silica A has a narrow particle size distribution, and its concentration on the coating surface can produce a better matting effect and will not affect the touch effect of the coating due to the presence of coarse particles. Its larger pore volume allows it to adsorb more wax ions during the modification process. The wax particles are distributed on the rough surface of silica A, which can further improve the matting effect and improve the touch feel. Silica B is prepared by the precipitation method, has a lower pore volume, and is not easily migrated to the surface layer under the competitive action of silica A, thereby affecting the touch or matting effect of the coating. And its wider particle size distribution can form a dense packing structure with the resin, thereby improving the mechanical strength of the coating. By jointly using two types of wax-modified silica as organic matting agents, a better matting effect and better wear resistance can be obtained while reducing the use of high-cost gel method silica, thereby reducing costs.

[0008] Further, the wax includes at least one of polyethylene wax and polypropylene wax.

[0009] Further, the mass ratio of the silica A to the silica B is 1:(10 - 15).

[0010] Further, the average particle size of the silica A is 8 - 12 μm.

[0011] Further, the average particle size of the silica B is 4 - 6 μm.

[0012] Further, the preparation method of the silica A includes: adding 0.5 - 1% by mass of polyethylene glycol to a sodium silicate solution with a solid content of 6 - 10%, heating to 30 - 50°C, adjusting the pH to 10 - 11, continuing to stir for 1 - 2 h after gel formation and adjusting the pH to 2 - 3, aging for 2 - 4 h, and then filtering, drying, and pulverizing to obtain the silica A.

[0013] Further, the preparation method of the silica B includes: preparing a sodium silicate solution with a solid content of 20 - 40%, adjusting the pH to 1.5 - 3 under stirring conditions, reacting at 30 - 50°C for 2 - 4 h, washing, drying, and then crushing to obtain the silica B.

[0014] Further, the step of wax modification includes: after mixing the silica A and the silica B, adding wax, and mixing at 110-120°C, 2000-3000 rpm, and under a protective atmosphere for 2-4 h. Further still, the addition amount of the wax is 0.8-1.5 times the total mass of the silica A and the silica B.

[0015] The second aspect of the present application provides the use of the above-mentioned organic matting agent in coating inks, including the following steps: after mixing the polyurethane resin and the solvent, adding an auxiliary agent and mixing, and then adding a filler and the organic matting agent and mixing.

[0016] Applying the above-mentioned organic matting agent to coating inks can produce better matting effects, lower costs, and better scratch resistance. Detailed implementation manners

[0017] For the convenience of understanding the present application, the present application will be described more comprehensively below. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the description of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0020] In the present application, among the technically characterized described in an open-ended manner, there are included closed technical solutions composed of the listed features, as well as open technical solutions including the listed features.

[0021] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are considered continuous and include the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when the range refers to integers, it includes each integer between the minimum and maximum values of the range. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0022] In this application, the percentage content involved, unless otherwise specified, refers to the mass percentage for solid-liquid mixing and solid-solid mixing, and refers to the volume percentage for liquid-liquid mixing.

[0023] In this application, the percentage concentration involved, unless otherwise specified, refers to the final concentration. The final concentration refers to the proportion of the added component in the system after adding the component.

[0024] In this application, the temperature parameter, unless otherwise specified, allows for isothermal treatment or treatment within a certain temperature range. The isothermal treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument.

[0025] The "particles" mentioned in this application, or substances with a defined particle size distribution, do not necessarily have a spherical shape and may be irregular. They can be primary particles or secondary particles. The particle size of irregular particles is calculated as the average of the maximum diameter and the minimum diameter.

[0026] Example 1: This example provides a preparation method of an organic matting agent and an ink coating:

[0027] Preparation of silica by the sol-gel method: Add 0.5% by mass of polyethylene glycol to a water glass solution with a solid content of 6% and heat to 50 °C. Adjust the pH to 11 using 0.5 mol / L dilute sulfuric acid. After the gel is formed, continue stirring for 1 h and continue to adjust the pH to 3 using the above dilute sulfuric acid. After aging for 3 h, carry out suction filtration and precipitate washing. Crush the filter cake to obtain silica A with an average particle size of 12 μm and a pore volume of 1.8 mL / g.

[0028] Preparation of silica by the precipitation method: Prepare a water glass solution with a solid content of 30%, and then slowly add 5% by mass fraction of hydrochloric acid under stirring to control the pH to 2. Keep the reaction at 30 °C for 3 h. After centrifugal precipitation, use deionized water to wash the precipitate by centrifugation twice. Dry it in vacuum at 120 °C for 4 h and crush it to an average particle size of 4 μm to obtain silica B with a pore volume of 0.4 mL / g.

[0029] Wax modification: Mix the above two kinds of silica in a mass ratio of 1:10, then add 1 times the mass of polyethylene wax (Clariant 3620), and mix for 2 h at 120 °C, 3000 rpm under a nitrogen atmosphere to obtain an organic matting agent.

[0030] Preparation of ink coating: This coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hangeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (talc powder, mica powder and titanium dioxide are mixed in equal mass), 2% organic matting agent and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% defoamer 810, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, raise the temperature to 120 °C, stir for 2 h, add the remaining components, and continue to stir for 6 h to obtain the ink coating.

[0031] Example 2: This example provides a preparation method of an organic matting agent and an ink coating:

[0032] Preparation of silica by the sol-gel method: Add 1% mass of polyethylene glycol to a water glass solution with a solid content of 10% and heat to 50 °C. Use 0.5 mol / L dilute sulfuric acid to adjust the pH to 11. After the gel is generated, continue to stir for 1 h and continue to use the above dilute sulfuric acid to adjust the pH to 2.5. After aging for 3 h, carry out suction filtration and precipitate washing. Crush the filter cake to obtain silica A with an average particle size of 8 μm and a pore volume of 1.5 mL / g.

[0033] Preparation of silica by the precipitation method: Prepare a water glass solution with a solid content of 20%, then slowly add 5% mass fraction of hydrochloric acid under stirring to control the pH to 3, keep the temperature at 50 °C for reaction for 3 h, carry out centrifugal precipitation, and use deionized water to wash the precipitate by centrifugation twice. Vacuum dry at 120 °C for 4 h and crush to an average particle size of 6 μm to obtain silica B with a pore volume of 0.8 mL / g.

[0034] Wax modification: Mix the above two kinds of silica in a mass ratio of 1:10, then add 1 times the mass of polyethylene wax (Clariant 3620), and mix for 2 h at 120 °C, 3000 rpm under a nitrogen atmosphere to obtain an organic matting agent.

[0035] Preparation of Ink Coating: The coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hangeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (a mass mixture of talc powder, mica powder, and titanium dioxide, etc.), 2% organic matting agent, and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% 810 defoaming agent, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, heat up to 120 °C, stir for 2 h, add the remaining components, and continue stirring for 6 h to obtain the ink coating.

[0036] Example 3: This example provides a preparation method of an organic matting agent and an ink coating:

[0037] Preparation of silica by the sol-gel method: Add 0.5% by mass of polyethylene glycol to a water glass solution with a solid content of 6%, heat to 50 °C, adjust the pH to 11 using 0.5 mol / L dilute sulfuric acid. After gel formation, continue stirring for 1 h and continue to adjust the pH to 3 using the above dilute sulfuric acid. After aging for 3 h, carry out suction filtration and precipitate washing, crush the filter cake to obtain silica A with an average particle size of 12 μm and a pore volume of 1.8 mL / g.

[0038] Preparation of silica by the precipitation method: Prepare a water glass solution with a solid content of 30%, then slowly add 5% by mass fraction of hydrochloric acid under stirring to control the pH to 2, keep the reaction at 30 °C for 3 h, carry out centrifugal precipitation, and then use deionized water to wash the precipitate by centrifugation twice. Vacuum dry at 120 °C for 4 h and crush to an average particle size of 4 μm to obtain silica B with a pore volume of 0.4 mL / g.

[0039] Wax modification: Mix the above two kinds of silica in a mass ratio of 1:15, then add 1 times the mass of polyethylene wax (Clariant 3620), and mix at 120 °C, 3000 rpm, and in a nitrogen atmosphere for 2 h to obtain the organic matting agent.

[0040] Preparation of Ink Coating: The coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hangeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (a mass mixture of talc powder, mica powder, and titanium dioxide, etc.), 2% organic matting agent, and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% 810 defoaming agent, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, heat up to 120 °C, stir for 2 h, add the remaining components, and continue stirring for 6 h to obtain the ink coating.

[0041] Example 4: This example provides a preparation method of an organic matting agent and an ink coating:

[0042] Preparation of silica by the sol-gel method: Add 0.5% by mass of polyethylene glycol to a water glass solution with a solid content of 6%, heat to 50 °C, adjust the pH to 11 using 0.5 mol / L dilute sulfuric acid. After the gel is formed, continue stirring for 1 h and continue to adjust the pH to 3 using the above dilute sulfuric acid. After aging for 3 h, carry out suction filtration and precipitate washing. Crush the filter cake to obtain silica A with an average particle size of 12 μm and a pore volume of 1.8 mL / g.

[0043] Preparation of silica by the precipitation method: Prepare a water glass solution with a solid content of 30%, then slowly add 5% by mass fraction of hydrochloric acid under stirring to control the pH to 2, keep the reaction at 30 °C for 3 h. After centrifugal precipitation, use deionized water to wash the precipitate by centrifugation twice, vacuum dry at 120 °C for 4 h, and crush to an average particle size of 4 μm to obtain silica B with a pore volume of 0.4 mL / g.

[0044] Wax modification: Mix the above two kinds of silica in a mass ratio of 1:10, then add 1 times the mass of polyethylene wax (Clariant 3620), and mix at 110 °C, 2000 rpm under a nitrogen atmosphere for 4 h to obtain the organic matting agent.

[0045] Preparation of the ink coating: This coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hangeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (a mixture of talc powder, mica powder and titanium dioxide in equal mass), 2% organic matting agent and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% defoamer 810, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, raise the temperature to 120 °C, stir for 2 h, add the remaining components, and continue stirring for 6 h to obtain the ink coating.

[0046] Example 5: This example provides a preparation method of an organic matting agent and an ink coating:

[0047] Preparation of silica by the sol-gel method: Add 0.5% by mass of polyethylene glycol to a water glass solution with a solid content of 6%, heat to 50 °C, adjust the pH to 11 using 0.5 mol / L dilute sulfuric acid. After the gel is formed, continue stirring for 1 h and continue to adjust the pH to 3 using the above dilute sulfuric acid. After aging for 3 h, carry out suction filtration and precipitate washing. Crush the filter cake to obtain silica A with an average particle size of 12 μm and a pore volume of 1.8 mL / g.

[0048] Preparation of silica by precipitation method: Prepare a water glass solution with a solid content of 30%, then slowly add hydrochloric acid with a mass fraction of 5% under stirring conditions to control the pH to 2, keep the temperature at 30 °C for 3 h of reaction, after centrifugal precipitation, wash the precipitate twice by centrifugation with deionized water, vacuum dry at 120 °C for 4 h, and pulverize to an average particle size of 4 μm to obtain silica B with a pore volume of 0.4 mL / g.

[0049] Wax modification: Mix the above two kinds of silica in a mass ratio of 1:10, then add polyethylene wax (Clariant 3620) with a mass 1.5 times that of the silica, and mix at 120 °C, 3000 rpm under a nitrogen atmosphere for 2 h to obtain an organic matting agent.

[0050] Preparation of ink coating: This coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hankeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (talc powder, mica powder and titanium dioxide are mixed in equal mass), 2% organic matting agent and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% defoamer 810, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, raise the temperature to 120 °C, stir for 2 h, add the remaining components, and continue to stir for 6 h to obtain the ink coating.

[0051] Comparative Example 1: This comparative example provides a preparation method of an organic matting agent and an ink coating:

[0052] Preparation of silica by precipitation method: Prepare a water glass solution with a solid content of 30%, then slowly add hydrochloric acid with a mass fraction of 5% under stirring conditions to control the pH to 2, keep the temperature at 30 °C for 3 h of reaction, after centrifugal precipitation, wash the precipitate twice by centrifugation with deionized water, vacuum dry at 120 °C for 4 h, and pulverize to an average particle size of 4 μm to obtain silica B with a pore volume of 0.4 mL / g.

[0053] Wax modification: Add polyethylene wax (Clariant 3620) with a mass 1 times that of the above silica B, and mix at 120 °C, 3000 rpm under a nitrogen atmosphere for 2 h to obtain an organic matting agent.

[0054] Preparation of Ink Coating: This coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hankeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (a mass mixture of talc powder, mica powder and titanium dioxide, etc.), 2% organic matting agent and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% 810 defoamer, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, heat up to 120 °C, stir for 2 h, add the remaining components, and continue to stir for 6 h to obtain the ink coating.

[0055] Comparative Example 2: This example provides a preparation method of an organic matting agent and an ink coating:

[0056] Preparation of silica by the sol-gel method: Add 0.5% by mass of polyethylene glycol to a water glass solution with a solid content of 6%, heat to 50 °C, adjust the pH to 11 with 0.5 mol / L dilute sulfuric acid. After the gel is formed, continue to stir for 1 h and continue to adjust the pH to 3 with the above dilute sulfuric acid. After aging for 3 h, carry out suction filtration and precipitate washing, and crush the filter cake to obtain silica A with an average particle size of 12 μm and a pore volume of 1.8 mL / g.

[0057] Wax modification: Add 1 times the mass of polyethylene wax (Clariant 3620) to the above silica A, mix at 120 °C, 3000 rpm under a nitrogen atmosphere for 2 h to obtain the organic matting agent.

[0058] Preparation of Ink Coating: This coating, by mass fraction, contains 40% polyurethane resin (Guangzhou Hankeng HG-7625), 8% carbon black, 30% methyl ethyl ketone, 19% filler (a mass mixture of talc powder, mica powder and titanium dioxide, etc.), 2% organic matting agent and 1% other additives (such as 0.5% leveling agent BYK346, 0.2% thickener RW-12, 0.2% 810 defoamer, 0.1% wetting agent Huntsman RP90). Mix the polyurethane resin and methyl ethyl ketone at 1000 rpm for 3 h, add the additives, heat up to 120 °C, stir for 2 h, add the remaining components, and continue to stir for 6 h to obtain the ink coating.

[0059] Perform performance tests on the ink coatings of the above examples and comparative examples.

[0060] Matting performance test: Refer to the method of GB1743-1979 and measure with a 60° gloss meter.

[0061] Abrasion resistance test: Refer to the test standard provided by GB / T 1768-2006 for testing.

[0062] Table 1 Performance test results of Examples 1-5 and Comparative Examples 1-2

[0063] Project Glossiness Wear resistance (1000g / 1000r, cs-10, mg) Example 1 3.1 5.2 Example 2 4.8 4.5 Example 3 5.3 5.0 Example 4 3.3 5.5 Example 5 3.0 5.1 Comparative Example 1 18.3 4.3 Comparative Example 2 2.8 11.5

[0064] According to the data in Table 1, the glossiness of Examples 1-5 is lower than that of Comparative Example 1, that is, Examples 1-5 have better matting effects. This is because the silica A in this solution is prepared by the sol-gel method and has a higher pore volume and a corresponding lower apparent density compared to the silica B prepared by the precipitation method. Therefore, after it is applied to the coating and coated, the wax-modified silica A in the coating tends to be distributed on the coating surface more than the wax-modified silica B. Silica A has a narrow particle size distribution, and its concentration on the coating surface can produce a better matting effect and will not affect the touch effect of the coating due to the presence of coarse particles. Its larger pore volume allows it to adsorb more wax ions during the modification process. The wax particles are distributed on the rough surface of silica A, which can further improve the matting effect and improve the touch feel; silica B is prepared by the precipitation method and has a lower pore volume. Under the competitive effect of silica A, it is not easy to migrate to the surface layer, thereby affecting the touch or matting effect of the coating; the abrasion resistance of Examples 1-5 is better than that of Comparative Example 2. This is because the wide particle size range of silica B prepared by the precipitation method is used in this solution, which can form a tight packing structure with the resin, thereby improving the mechanical strength of the coating, which cannot be achieved by using only the sol-gel method silica as a matting agent.

[0065] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0066] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. An organic matting agent, characterized in that: The invention comprises wax-modified silica A and wax-modified silica B. The silica A is prepared by a gel method, and the pore volume of the silica A is 1.5-2 mL / g. The silica B is prepared by a precipitation method, and the pore volume of the silica B is 0.4-0.8 mL / g.

2. The organic matting agent according to claim 1, characterized in that: The wax includes at least one of polyethylene wax and polypropylene wax.

3. The organic matting agent according to claim 1, characterized in that: The mass ratio of the silicon dioxide A to the silicon dioxide B is 1:(10-15).

4. The organic matting agent according to claim 1, characterized in that: The average particle size of the silicon dioxide A is 8-12 μm.

5. The organic matting agent according to claim 1, characterized in that: The average particle size of the silicon dioxide B is 4-6 μm.

6. The organic matting agent according to claim 1, characterized in that: The preparation method of the silicon dioxide A comprises: adding 0.5-1% by mass of polyethylene glycol to a water glass solution with a solid content of 6-10% and heating to 30-50° C., adjusting the pH to 10-11, stirring for 1-2 hours after gel is generated and adjusting the pH to 2-3, aging for 2-4 hours, filtering, drying and crushing to obtain the silicon dioxide A.

7. The organic matting agent according to claim 1, characterized in that: The preparation method of the silicon dioxide B comprises: preparing a water glass solution with a solid content of 20-40%, adjusting the pH to 1.5-3 under stirring conditions, reacting at 30-50° C. for 2-4 hours, washing, drying, and then crushing to obtain the silicon dioxide B.

8. The organic matting agent according to claim 1, characterized in that: The wax modification step comprises: mixing the silicon dioxide A and the silicon dioxide B, adding wax, and mixing for 2-4 hours at 110-120° C., 2000-3000 rpm, and a protective atmosphere.

9. The organic matting agent according to claim 8, characterized in that: The added amount of the wax is 0.8-1.5 times the total mass of the silicon dioxide A and the silicon dioxide B.

10. Use of the organic matting agent according to any one of claims 1 to 9 in coatings and inks, characterized in that: The method comprises the following steps: mixing the polyurethane resin with the solvent, adding an auxiliary agent and mixing, and then adding a filler and the organic matting agent and mixing.