Silicone oil with high organic pigment adsorbability and preparation method thereof

Abstract

The invention discloses silicone oil with high adsorbability to organic pigments, which comprises the following raw materials in parts by weight. The component A is prepared from the following components in parts by weight: 1-2 parts of a silane coupling agent, 0.5-1 part of butanedioic anhydride, 6-10 parts of dimethyl silicone oil and 0.01-0.05 part of a catalyst; the silane coupling agent is any one of gamma-aminopropyl triethoxy silane, gamma-glycidyl ether oxypropyl trimethoxy silane and gamma-(methacryloyloxy) propyl trimethoxy silane, and the silane coupling agent is any one of a silane coupling agent, a silane coupling agent, a silane coupling agent and a silane coupling agent, wherein the silane coupling agent is any one of gamma-aminopropyl triethoxy silane and gamma-(methacryloyloxy) propyl trimethoxy silane; the catalyst is any one of potassium carbonate, a platinum catalyst and zinc carbonate. The silicon oil adsorption capacity is improved by adding the carboxyl modified nanoparticles, so that the purpose of greatly improving the organic pigment adsorption capacity is achieved; meanwhile, the silicone oil is modified through the modified nanoparticles, so that the controllability of the whole reaction process is improved; the effects that the efficiency is high, byproducts are reduced, and grafting of the nano-particles and the silicone oil is more controllable are achieved; the heat stability can be improved by adding the carboxyl modified nanoparticles.

Description

Technical Field

[0001] This invention relates to a method for preparing silicone oil, specifically to a silicone oil with strong adsorption of organic pigments and its preparation method. Background Technology

[0002] Silicone oil, as an important chemical raw material, is widely used in the aerospace industry for lubrication and vibration damping due to its unique physical and chemical properties. However, traditional silicone oils often come in a single color, making it difficult to meet the market's demand for diverse and personalized products. Therefore, the research and development of silicone oil color-changing technology has become a hot topic in the industry, and the emergence of silicone oil color-changing technology marks a significant step forward in technological innovation in this field.

[0003] Methyl silicone oil, a type of organosilicon polymer with silicon-oxygen bonds as its main chain, has secured a place in many industrial fields due to its excellent heat resistance, cold resistance, electrical insulation, lubricity, and chemical stability. However, with the advancement of technology and the diversification of needs, the functionality of traditional silicone oils has gradually revealed its limitations, prompting scientists to continuously explore ways to modify them.

[0004] Existing carboxyl silicone oils often have limited color options, making it difficult to meet the diverse and personalized product demands of emerging markets. Certain fields require silicone oils to possess superior performance in terms of appearance, heat and weather resistance, and oxidation resistance. Therefore, the development of silicone oil color-changing technology has become a hot topic in the industry, and the emergence of silicone oil color-changing patents marks a significant step forward in technological innovation in this field.

[0005] Because methyl silicone oil is highly stable, and most silicone oil color-changing products on the market involve adding dyes or pigments, silicone oil itself has poor adsorption and dispersion, easily leading to uneven product color and sedimentation. To overcome this limitation, it is necessary to continuously explore silicone oil modification methods to improve its adsorption capacity. Summary of the Invention

[0006] This invention addresses the problems of poor adsorption capacity of silicone oil for pigments, difficulty in controlling its structure, numerous byproducts, and poor thermal stability. It discloses a silicone oil with strong adsorption capacity for organic pigments and its preparation method. By adding carboxyl-modified nanoparticles, the adsorption capacity of the silicone oil is improved, thereby significantly enhancing its adsorption capacity for organic pigments. Simultaneously, by further modifying the silicone oil with modified nanoparticles, the controllability of the entire reaction process is improved, achieving high efficiency, reduced byproducts, and more controllable grafting of nanoparticles to silicone oil. Adding carboxyl-modified nanoparticles also improves thermal stability.

[0007] This method for preparing silicone oil with strong adsorption to organic pigments specifically involves a novel method for preparing special nanomaterials and grafting them onto silicone oil. Silica, due to its excellent physicochemical properties, such as high specific surface area, good thermal stability, and chemical stability, has wide applications in materials science. However, its hydrophilic surface and difficulty in dispersing in organic media limit its application range. By chemically grafting silicone oil onto the silica surface, not only can its oleophilicity be improved, but its compatibility with organic dyes can also be enhanced, broadening the color gamut of silicone oil and expanding its application areas.

[0008] The technical means adopted by the present invention to solve the above problems are as follows: A silicone oil with strong adsorption capacity for organic pigments is disclosed. By weight, it comprises: 1-2 parts of silane coupling agent; 0.5-1 part of succinic anhydride; 6-10 parts of dimethyl silicone oil; and 0.01-0.05 parts of catalyst. The silane coupling agent is any one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-(methacryloyloxy)propyltrimethoxysilane. The catalyst is any one of potassium carbonate, platinum catalyst, and zinc carbonate.

[0009] This invention utilizes a silicone oil with strong adsorption capacity for organic pigments, employing a rational ratio of silane coupling agent, succinic anhydride, dimethyl silicone oil, and a catalyst. By modifying the surface of silica with the silane coupling agent KH-550 and succinic anhydride, the silane coupling agent reacts with the silanol groups on the silica surface to form a silanized surface. Using a catalyst and solvent, at a specific temperature, silicone oil molecules are chemically bonded to the silane coupling agent on the silica surface, forming a grafted structure. The surface modification of silica with the silane coupling agent KH-550 and succinic anhydride allows the silane coupling agent to react with the silanol groups on the silica surface, forming a silanized surface. Using a catalyst and solvent, at a specific temperature, silicone oil molecules are chemically bonded to the silane coupling agent on the silica surface, forming a grafted structure.

[0010] The present invention provides a method for preparing silicone oil with strong adsorption of organic pigments, comprising the following steps: S1. Silane coupling agent and succinic anhydride are weighed according to a certain ratio and placed in flasks for vacuum dehydration at a pressure of -0.05MPa to -0.1MPa and a temperature of 90℃ to 120℃ for 2h to 4h; then purified to form a silane coupling agent with a carboxyl group.

[0011] S2. Disperse nano-sized silica powder in anhydrous ethanol, with the mass percentage of nano-sized silica powder being 0.1% to 0.5%, and stir after addition; add the silane coupling agent with carboxyl groups, and stir at 90℃ to 100℃ for 6 to 8 hours to allow the silane coupling agent to react with the silanol groups on the surface of silica.

[0012] S3. After the reaction is complete, centrifuge the sample; wash it with unreacted carboxylic acid; adjust the temperature to 50℃~80℃ and the vacuum degree to -0.08MPa~-0.1MPa for vacuum drying to obtain modified silica powder.

[0013] S4. Modified silica powder is mixed with dimethyl silicone oil, and a catalyst and solvent are added. The mixture is stirred at 80℃~120℃ and a pressure of -0.05~-0.1MPa for 1~3h to obtain the modified nanomaterial graft structure.

[0014] Furthermore, in step S1, the silane coupling agent with carboxyl groups is purified by dehydration and then mixed and heated in an oil bath at 80°C~90°C for 1.5h~3h.

[0015] Furthermore, in step S2, the amount of silane coupling agent with carboxyl groups added is 2% to 5% of the total amount of nano-sized silica powder and anhydrous ethanol.

[0016] Furthermore, the purity of the anhydrous ethanol in step S2 is 90%~99%.

[0017] Furthermore, the mass ratio of the modified silica powder to the dimethyl silicone oil is 1~5:95~99.

[0018] Furthermore, the catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate, and the solvent is any one of toluene or xylene. The amount of catalyst added is 1% to 2% of the solvent. The amount of solvent added is 1 to 3 times the total mass of the modified silica powder and dimethyl silicone oil mixture.

[0019] Compared with the prior art, the beneficial effects of the present invention are: This invention discloses a method for preparing silicone oil with strong adsorption capacity for organic pigments. The method involves surface modification of silica using a silane coupling agent KH-550 and succinic anhydride, causing the silane coupling agent to react with the silanol groups on the silica surface to form a silanized surface. Using a catalyst and solvent, at a specific temperature, silicone oil molecules are chemically bonded to the silane coupling agent on the silica surface, forming a grafted structure. The modified silica exhibits excellent performance in terms of dispersibility, thermal stability, and compatibility with silicone oil, and demonstrates a strong adsorption capacity for most pigments and color pastes.

[0020] This invention provides new ideas and methods for the application of silica in composite materials and the coloring ability of silicone oil. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the silanization reaction of modified nanoparticles in the preparation method of silicone oil with strong adsorption of organic pigments, as described in Example 1.

[0022] Figure 2 This is a schematic diagram of the modified nanomaterial grafting method for preparing silicone oil with strong adsorption of organic pigments, as described in Example 1.

[0023] Figure 3 The infrared spectrum of modified silica in the preparation method of silicone oil with strong adsorption of organic pigments in Example 1 is shown.

[0024] Figure 4 The thermogravimetric curve of the modified silica is shown in Example 1, which is a method for preparing silicone oil with strong adsorption of organic pigments.

[0025] Figure 5 The images show the compatibility test results of the product prepared by the method of preparing silicone oil with strong adsorption of organic pigments in Example 1 with the dye.

[0026] Figure 6 Images show compatibility test results of ordinary dimethyl silicone oil products mixed with dyes. Detailed Implementation

[0027] The invention will be further described below with reference to the accompanying drawings.

[0028] The silicone oil of the present invention, which has strong adsorption capacity for organic pigments, comprises, by weight, 1-2 parts of silane coupling agent; 0.5-1 part of succinic anhydride; 6-10 parts of dimethyl silicone oil; and 0.01-0.05 parts of catalyst. The silane coupling agent is any one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, or γ-(methacryloyloxy)propyltrimethoxysilane. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate.

[0029] The specific preparation method is as follows. Example 1

[0030] This embodiment describes a method for preparing silicone oil with strong adsorption capacity for organic pigments, comprising the following steps: S1. Weigh 2 parts of silane coupling agent and 1 part of succinic anhydride (SA) according to the ratio, and put them into three-diameter flasks respectively. Dehydrate under vacuum at a pressure of -0.05MPa and a temperature of 100℃ for 2 hours. After dehydration, mix and heat in an oil bath at 80℃ for 2 hours to purify and form a silane coupling agent with carboxyl groups.

[0031] S2. Disperse 1 part of nano-sized silica powder in anhydrous ethanol, with the mass percentage of nano-sized silica powder being 0.1%. Add the ethanol slowly and stir for 15 min. Add the aforementioned silane coupling agent containing carboxyl groups and stir at 100℃ for 6 h to allow the silane coupling agent to react with the silanol groups on the surface of silica. The reaction diagram is shown below. Figure 1 .

[0032] S3. After the reaction is complete, centrifuge three times at a speed of 10,000 rpm for 30 min. Wash the product with unreacted carboxylic acid. Vacuum dry the product at a temperature of 50℃ and a vacuum degree of -0.08 MPa for 30 min to obtain modified silica powder.

[0033] S4. Take 1 part of modified silica powder and mix it with 99 parts of dimethyl silicone oil. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate; in this example, it is a platinum catalyst. The solvent is any one of toluene or xylene; in this example, it is xylene. The amount of platinum catalyst added is 1% of the mass of the solvent. The amount of solvent added is twice the mass of the mixture of modified silica powder and dimethyl silicone oil.

[0034] The modified nanomaterial graft structure was obtained by stirring for 2 hours at 80℃ and a pressure of -0.1MPa. The reaction diagram is shown below. Figure 2 The obtained product was tested and found to have a viscosity of 2376 cP, a refractive index of 1.39, and no change after 8 hours at 150℃.

[0035] The silicone oil product with strong adsorption of organic pigments in this embodiment was tested, and the test plan and description are as follows.

[0036] (1) Infrared testing The modified silica exhibited a sharp C=O stretching vibration peak (carboxylic acid) near 1700 cm⁻¹, and two moderate-intensity carboxylate (COO-) peaks at 1550-1700 cm⁻¹ and 1400-1450 cm⁻¹, respectively. Figure 3 As shown, this indicates that the carboxyl functional group has been successfully grafted onto the silicon dioxide surface.

[0037] (2) Thermogravimetric analysis like Figure 4 As shown, the modified silica can still maintain good thermal stability at higher temperatures without significant mass loss, indicating that the modification process did not have a significant impact on the thermal stability of silica.

[0038] (3) Compatibility Nanocomposite materials were prepared by mixing modified silica with silicone oil. Performance tests showed that the modified silica significantly improved the mechanical properties and weather resistance of the composite material, indicating that the modification treatment effectively enhanced the compatibility between silica and silicone oil. Furthermore, from... Figure 5 Modified silicone oil with added dye and Figure 6 After ordinary dimethyl silicone oil was left to stand for 3 days, a comparative observation showed that the nano-modified silicone oil had a stronger ability to adsorb pigments, did not show stratification, and had a higher degree of dye adhesion, while dimethyl silicone oil showed obvious stratification and precipitation. Example 2

[0039] This embodiment describes a method for preparing silicone oil with strong adsorption capacity for organic pigments, comprising the following steps: S1. Weigh 1 part of silane coupling agent and 0.5 parts of succinic anhydride (SA) according to the ratio, and put them into three-diameter flasks respectively. Dehydrate under vacuum at a pressure of -0.1 MPa and a temperature of 120℃ for 4 hours. After dehydration, mix and heat in an oil bath at 90℃ for 3 hours to purify and form a silane coupling agent with carboxyl groups.

[0040] S2. Take 5 parts of nano-sized silica powder and disperse them in anhydrous ethanol. The mass percentage of nano-sized silica powder is 0.5%. Add the ethanol slowly and stir for 25 min. Add the above-mentioned silane coupling agent with carboxyl groups and stir at 90℃ for 8 h to allow the silane coupling agent to react with the silanol groups on the surface of silica.

[0041] S3. After the reaction is complete, centrifuge three times at a speed of 12000 rpm for 20 min. Wash the product with unreacted carboxylic acid. Vacuum dry at 80℃ and -0.1 MPa for 60 min to obtain modified silica powder.

[0042] S4. Take 5 parts of modified silica powder and mix with 95 parts of dimethyl silicone oil. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate; in this example, it is a platinum catalyst. The solvent is any one of toluene or xylene; in this example, it is xylene. The amount of platinum catalyst added is 2% of the mass of the solvent. The amount of solvent added is 1 times the mass of the mixture of modified silica powder and dimethyl silicone oil.

[0043] Modified nanomaterial grafting structures were obtained by stirring for 4 hours at 120℃ and a pressure of -0.05MPa. The resulting product had a viscosity of 2130 cP, a refractive index of 1.24, and showed no change after 8 hours at 150℃. Example 3

[0044] This embodiment describes a method for preparing silicone oil with strong adsorption capacity for organic pigments, comprising the following steps: S1. Weigh 1 part γ-aminopropyltriethoxysilane and 0.5 parts succinic anhydride (SA) according to the ratio, and put them into three-diameter flasks for vacuum dehydration at a pressure of -0.05 MPa and a temperature of 90℃ for 2 hours. After dehydration, mix and heat in an oil bath at 80℃ for 2 hours to purify and form a silane coupling agent with a carboxyl group.

[0045] S2. Take 1 part of nano-sized silica powder and disperse it in anhydrous ethanol. The mass percentage of nano-sized silica powder is 0.1%. Add it slowly and stir for 15 min. Add the above-mentioned silane coupling agent with carboxyl groups and stir at 100℃ for 6 h to allow the silane coupling agent to react with the silanol groups on the surface of silica.

[0046] S3. After the reaction is complete, centrifuge three times at a speed of 10,000 rpm for 30 min. Wash the product with unreacted carboxylic acid. Vacuum dry the product at a temperature of 50℃ and a vacuum degree of -0.08 MPa for 40 min to obtain modified silica powder.

[0047] S4. Take 1 part of modified silica powder and mix it with 99 parts of dimethyl silicone oil. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate; in this example, it is a platinum catalyst. The solvent is any one of toluene or xylene; in this example, it is xylene. The amount of platinum catalyst added is 1% of the mass of the solvent. The amount of solvent added is 3 times the mass of the mixture of modified silica powder and dimethyl silicone oil.

[0048] Modified nanomaterial grafting structures were obtained by stirring for 2 hours at 80℃ and a pressure of -0.1MPa. The resulting product had a viscosity of 2089 cP, a refractive index of 1.19, and showed no change after 8 hours at 150℃. Example 4

[0049] This embodiment describes a method for preparing silicone oil with strong adsorption capacity for organic pigments, comprising the following steps: S1. Take 2 parts of γ-glycidyl etheroxypropyltrimethoxysilane and 1 part of succinic anhydride (SA) and place them in a three-necked flask and heat at 100℃ for 2 hours under -0.98MPa. After dehydration, mix and heat in an oil bath at 80℃ for 2 hours to purify and form a silane coupling agent with a carboxyl group.

[0050] S2. Take 3 parts of nano-sized silica powder and disperse it in anhydrous ethanol. The mass percentage of nano-sized silica powder is 0.3%. Add it slowly and stir for 20 min. Add the above-mentioned silane coupling agent with carboxyl groups and stir at 95℃ for 7 h to allow the silane coupling agent to react with the silanol groups on the surface of silica.

[0051] S3. After the reaction is complete, centrifuge twice at a speed of 15000 rpm for 10 min. Wash the product with unreacted carboxylic acid. Vacuum dry at a temperature of 60℃ and a vacuum degree of -0.1 MPa for 50 min to obtain modified silica powder.

[0052] S4. Take 2 parts of modified silica powder and mix with 98 parts of dimethyl silicone oil. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate; in this example, it is zinc carbonate. The solvent is any one of toluene or xylene; in this example, it is toluene. The amount of zinc carbonate added is 1% of the mass of the solvent. The amount of solvent added is twice the mass of the mixture of modified silica powder and dimethyl silicone oil.

[0053] Modified nanomaterial grafting structures were obtained by stirring for 2 hours at 80℃ and a pressure of -0.1MPa. The resulting product had a viscosity of 2346 cP, a refractive index of 1.42, and showed no change after 8 hours at 150℃. Example 5

[0054] This embodiment describes a method for preparing silicone oil with strong adsorption capacity for organic pigments, comprising the following steps: S1. Take 2 parts of γ-(methacryloyloxy)propyltrimethoxysilane and 1 part of succinic anhydride (SA) and place them in a three-necked flask and heat at 100℃ for 2.5 h at -0.098 MPa. After dehydration, mix and heat in an oil bath at 90℃ for 1.5 h to purify and form a silane coupling agent with a carboxyl group.

[0055] S2. Take 4 parts of nano-sized silica powder and disperse them in anhydrous ethanol. The mass percentage of nano-sized silica powder is 0.4%. Add the ethanol slowly and stir for 25 min. Add the above-mentioned silane coupling agent with carboxyl groups and stir at 90°C for 7 h to allow the silane coupling agent to react with the silanol groups on the surface of silica.

[0056] S3. After the reaction is complete, centrifuge twice at a speed of 11000 rpm for 25 min. Wash the product with unreacted carboxylic acid. Vacuum dry at 70℃ and -0.1 MPa for 30 min to obtain modified silica powder.

[0057] S4. Take 3 parts of modified silica powder and mix with 97 parts of dimethyl silicone oil. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate; in this example, it is potassium carbonate. The solvent is any one of toluene or xylene; in this example, it is toluene. The amount of potassium carbonate added is 2% of the mass of the solvent. The amount of solvent added is 3 times the mass of the mixture of modified silica powder and dimethyl silicone oil.

[0058] Modified nanomaterial grafting structures were obtained by stirring for 1 hour at 100℃ and a pressure of -0.05MPa. The resulting product had a viscosity of 2235 cP, a refractive index of 1.31, and showed no change after 8 hours at 150℃. Example 6

[0059] This embodiment describes a method for preparing silicone oil with strong adsorption capacity for organic pigments, comprising the following steps: S1. Take 1 part of γ-(methacryloyloxy)propyltrimethoxysilane and 0.5 parts of succinic anhydride (SA) and place them in a three-necked flask and heat at 100℃ for 2 hours at -0.098MPa. After dehydration, mix and heat in an oil bath at 90℃ for 2 hours to purify and form a silane coupling agent with a carboxyl group.

[0060] S2. Take 1 part of nano-sized silica powder and disperse it in anhydrous ethanol. The mass percentage of nano-sized silica powder is 0.1%. Add it slowly and stir for 25 min. Add the above-mentioned silane coupling agent with carboxyl groups and stir at 100℃ for 6 h to allow the silane coupling agent to react with the silanol groups on the surface of silica.

[0061] S3. After the reaction is complete, centrifuge twice at a speed of 11000 rpm for 25 min. Wash the product with unreacted carboxylic acid. Vacuum dry at 70℃ and -0.1 MPa for 60 min to obtain modified silica powder.

[0062] S4. Take 3 parts of modified silica powder and mix with 97 parts of dimethyl silicone oil. The catalyst is any one of potassium carbonate, platinum catalyst, or zinc carbonate; in this example, it is potassium carbonate. The solvent is any one of toluene or xylene; in this example, it is toluene. The amount of potassium carbonate added is 2% of the mass of the solvent. The amount of solvent added is 3 times the mass of the mixture of modified silica powder and dimethyl silicone oil.

[0063] Modified nanomaterial grafting structures were obtained by stirring for 2 hours at 80℃ and a pressure of -0.05MPa. The resulting product had a viscosity of 2199 cP, a refractive index of 1.23, and showed no change after 8 hours at 150℃.

[0064] In summary, the method for preparing silicone oil with strong adsorption capacity for organic pigments according to the present invention involves surface modification of silica using silane coupling agent KH-550 and succinic anhydride, causing the silane coupling agent to react with the silanol groups on the silica surface to form a silanized surface. Through a catalyst (and solvent), at a certain temperature, silicone oil molecules are chemically bonded to the silane coupling agent on the silica surface, forming a grafted structure. The modified silica exhibits excellent performance in terms of dispersibility, thermal stability, and compatibility with silicone oil, and demonstrates a strong adsorption capacity for most pigments and color pastes.

[0065] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the invention, which should be defined by the claims.

Claims

1. A silicone oil with strong adsorption capacity for organic pigments, characterized in that, By weight, it includes the following raw materials; Silane coupling agent: 1-2 parts, succinic anhydride: 0.5-1 parts, dimethyl silicone oil: 6-10 parts, catalyst: 0.01-0.05 parts; the silane coupling agent is any one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-(methacryloyloxy)propyltrimethoxysilane; the catalyst is any one of potassium carbonate, platinum catalyst, and zinc carbonate.

2. A method for preparing the silicone oil with strong adsorption of organic pigments as described in claim 1, characterized in that, Includes the following steps: S1. Silane coupling agent: Succinic anhydride is weighed according to the ratio and placed in flasks for vacuum dehydration at a pressure of -0.05MPa to -0.1MPa and a temperature of 90℃ to 120℃ for 2 to 4 hours; then purified to form a silane coupling agent with a carboxyl group. S2. Disperse nano-sized silica powder in anhydrous ethanol, with the mass percentage of nano-sized silica powder being 0.1% to 0.5%, and stir for 15 to 25 minutes after addition; add the silane coupling agent with carboxyl groups, and stir at 90°C to 100°C for 6 to 8 hours to allow the silane coupling agent to react with the silanol groups on the surface of silica. S3. After the reaction is complete, centrifuge; wash with unreacted carboxylic acid; adjust the temperature to 50℃~80℃ and the vacuum degree to -0.08MPa~-0.1MPa for vacuum drying to obtain modified silica powder; S4. Modified silica powder is mixed with dimethyl silicone oil, and a catalyst and solvent are added. The mixture is stirred at 80℃~120℃ and a pressure of -0.05MPa~-0.1MPa for 1h~3h to obtain the modified nanomaterial graft structure.

3. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 2, characterized in that, In step S1, the silane coupling agent with carboxyl groups is purified by dehydration and then mixed and heated in an oil bath at 80℃~90℃ for 1.5h~3h.

4. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 2, characterized in that, In step S2, the amount of silane coupling agent with carboxyl groups added is 2% to 5% of the total amount of nano-sized silica powder and anhydrous ethanol.

5. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 2, characterized in that, The purity of anhydrous ethanol in step S2 is 90%~99%.

6. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 2, characterized in that, The mass ratio of the modified silica powder to dimethyl silicone oil is 1~5:95~99.

7. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 6, characterized in that, The catalyst is any one of potassium carbonate, platinum catalyst, and zinc carbonate; the solvent is any one of toluene and xylene, and the amount added is 1% to 2% of the solvent; the amount of solvent added is 1 to 3 times the total mass of the modified silica powder and dimethyl silicone oil mixture.

8. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 2, characterized in that, In step S3, the centrifugation speed is 10000rpm~15000rpm, and the time is 10min~30min, and the centrifugation is performed 2~3 times.

9. The method for preparing silicone oil with strong adsorption capacity for organic pigments according to claim 2, characterized in that, The drying temperature in step S3 is 50℃~80℃, and the drying time is 30min~60min.

Images