A polyurethane paint composition for cabinets and its preparation method

Abstract

This application belongs to the field of polyurethane paint technology, specifically providing a method for preparing a polyurethane paint composition for cabinets, comprising the following steps: 1) By weight, take 210-230 parts of polyester polyol, 140-160 parts of nano silica, 530-560 parts of butyl acetate, 20-30 parts of furan polymer, 5-10 parts of leveling agent, 3-5 parts of defoamer, and 2-5 parts of dispersant and mix them evenly to obtain a base liquid; 2) Add 60-75 parts of aliphatic polyisocyanate, 25-35 parts of maleimide derivative, 5-7.5 parts of 2-aldehyde phenylboronic acid, and 50-70 parts of anhydrous ethanol evenly to the base liquid, and continue mixing evenly to obtain the final product. The polyurethane paint composition for cabinets prepared by this application has the advantage of good water and oil repellency.

Description

Technical Field

[0001] This application belongs to the field of polyurethane paint technology, and in particular relates to a polyurethane paint composition for cabinets and its preparation method. Background Technology

[0002] Polyurethane coatings have excellent adhesion, waterproof performance, and chemical corrosion resistance. They are widely used in the protection of substrates such as metal, wood, and concrete. They can provide excellent barrier properties against media such as water, acids, alkalis, and solvents, thus extending the service life of the substrate.

[0003] In the kitchen and bathroom sector, kitchen and bathroom furniture such as cabinets, dining tables, and gas stoves often face the problem of easily adhering to high-viscosity oil stains. Although the coating formed by traditional polyurethane paint can be waterproof, it is difficult to protect against the oil fumes produced during the cooking process. These oil fumes are highly adhesive oil droplets formed after being oxidized at high temperatures. These oil droplets are very easy to be absorbed on the coating surface and are difficult to clean. Over time, this will cause the coating to age and turn yellow, and some oil droplets may even seep into the interior of the coating, causing irreversible damage to the coating.

[0004] In response, some technicians have introduced inorganic particles such as nano-silica and nano-zinc oxide into the coating system. This can improve the surface roughness and interfacial tension of the coating, and has a certain repellent effect on oil droplets, thus achieving an oil-resistant effect. For example, patent document CN108690485A discloses a solvent-resistant and oil-repellent polyurethane coating, comprising 30-40 parts of polyether polyol, 5-8 parts of isocyanate, 10-12 parts of polyethylene adipate, 5-10 parts of polypropylene glycol, 10-25 parts of curing agent, 2-5 parts of carbide, 10-20 parts of filler, and 1-2 parts of hydrolysis resistant agent. The preparation method involves adding isocyanate to the polyether polyol at 60-80℃ and reacting for 1- After 3 hours, the catalyst, polyethylene adipate, polypropylene glycol, and filler are added. The mixture is stirred and reacted under vacuum at a temperature of 30-60℃ for 2-4 hours. After maintaining the temperature, acetone is added and stirred to wash the mixture. The acetone washing liquid is then discharged and the mixture is dried in a vacuum oven at 40-60℃ until the acetone is completely evaporated, yielding component A. Component A is then mixed evenly with carbides and curing agents, applied, and dried to obtain a solvent-resistant and oil-resistant polyurethane coating with good oil and solvent resistance.

[0005] While the aforementioned technical improvements have enhanced the oil-repellent effect to some extent, the introduction of inorganic particles has resulted in poor mechanical stability of the coating surface, and the oil resistance has also deteriorated over time. Summary of the Invention

[0006] To address the aforementioned issues and further improve the oil and stain resistance of polyurethane coatings, this application provides a polyurethane paint composition for cabinets and its preparation method.

[0007] This application first provides a method for preparing a polyurethane paint composition for cabinets, comprising the following steps:

[0008] 1) By weight, take 210-230 parts of polyester polyol, 140-160 parts of nano silica, 530-560 parts of butyl acetate, 20-30 parts of furan polymer, 5-10 parts of leveling agent, 3-5 parts of defoamer, and 2-5 parts of dispersant and mix them evenly to prepare the base liquid.

[0009] 2) Mix 60-75 parts of aliphatic polyisocyanate, 25-35 parts of maleimide derivative, 5-7.5 parts of 2-aldehyde phenylboronic acid, and 50-70 parts of anhydrous ethanol evenly, then add them to the base solution and continue mixing evenly to obtain the final product.

[0010] Furthermore, the furan polymer is prepared using a method comprising the following steps:

[0011] S1: Hydroxyl-terminated polyethylene glycol and methylchlorosulfonic acid are reacted to obtain intermediate material;

[0012] S2: The intermediate material and furfuryl alcohol are subjected to an ester exchange reaction to obtain the product.

[0013] Furthermore, in step 1), the polyester polyol is at least one of NL387 polyester polyol and PVR polyester polyol.

[0014] Furthermore, in step 1), the polyester polyol is composed of NL387 polyester polyol and PVR polyester polyol in a mass ratio of 160-165:50-60.

[0015] Furthermore, in step 1), the average particle size of the nano-silica is 50-100 nm.

[0016] Furthermore, in step 1), the leveling agent is an organosilicon leveling agent.

[0017] Furthermore, in step 1), the defoamer is a polyvinyl ether defoamer.

[0018] Furthermore, in step 2), the maleimide derivative is prepared by reacting maleimide with polyetheramine.

[0019] Furthermore, the molecular weight of the polyetheramine is 230-600.

[0020] This application also provides a polyurethane paint composition for cabinets, which is prepared by the above-described preparation method.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] This application utilizes the reaction of polyester polyols and aliphatic polyisocyanates to form a polymer network structure, which restricts molecular chain movement and reduces surface structural damage and oil droplet penetration. Simultaneously, furan polymers and maleimide derivatives are introduced into the polymer network structure. These two components can form crosslinks when heated to a certain temperature. Based on the inherent constraint of the polymer network, this crosslinking can induce internal stress during coating curing, forming a micro / nano-uneven structure on the coating surface. This creates an air cushion on the coating surface, reducing oil droplet adhesion and altering the wetting state of oil droplets, resulting in excellent oil repellency. Furthermore, the coating of this application also exhibits excellent water repellency. Unlike rough surfaces formed solely using inorganic nanoparticles as fillers, the coating of this application possesses excellent wear resistance, making it highly suitable for kitchen environments. Attached Figure Description

[0023] Figure 1 The images show the oil droplet wetting state of the polyurethane paint composition coatings for cabinets in Examples 1-2 and Control Groups 1-2 of this application.

[0024] Figure 2 These are atomic force micrographs of the coatings in Examples 1-2 of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0028] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0029] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0030] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0031] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0032] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0033] In this application, "above" or "below" includes the stated number. For example, "below 1" includes 1.

[0034] In this application, room temperature refers to 0~40℃, including but not limited to 10~40℃, or further to 20~30℃.

[0035] Based on extensive experimental research, this application provides a method for preparing a polyurethane paint composition for cabinets, comprising the following steps:

[0036] 1) By weight, take 210-230 parts of polyester polyol, 140-160 parts of nano silica, 530-560 parts of butyl acetate, 20-30 parts of furan polymer, 5-10 parts of leveling agent, 3-5 parts of defoamer, and 2-5 parts of dispersant and mix them evenly to prepare the base liquid.

[0037] 2) Mix 60-75 parts of aliphatic polyisocyanate, 25-35 parts of maleimide derivative, 5-7.5 parts of 2-aldehyde phenylboronic acid, and 50-70 parts of anhydrous ethanol evenly, then add them to the base solution and continue mixing evenly to obtain the final product.

[0038] In some specific embodiments, a method for preparing a polyurethane paint composition for cabinets includes the following steps:

[0039] 1) By weight, take 210 parts of polyester polyol, 140 parts of nano silica, 530 parts of butyl acetate, 20 parts of furan polymer, 5 parts of leveling agent, 3 parts of defoamer and 2 parts of dispersant and mix them evenly to prepare the base liquid.

[0040] 2) Mix 60 parts of aliphatic polyisocyanate, 25 parts of maleimide derivative, 5 parts of 2-aldehyde phenylboronic acid, and 50 parts of anhydrous ethanol evenly, then add them to the base solution and continue mixing evenly to obtain the final product.

[0041] In some specific embodiments, a method for preparing a polyurethane paint composition for cabinets includes the following steps:

[0042] 1) By weight, take 230 parts polyester polyol, 160 parts nano silica, 560 parts butyl acetate, 30 parts furan polymer, 10 parts leveling agent, 5 parts defoamer and 5 parts dispersant and mix them evenly to prepare the base liquid.

[0043] 2) Mix 75 parts of aliphatic polyisocyanate, 35 parts of maleimide derivative, 7.5 parts of 2-aldehyde phenylboronic acid, and 70 parts of anhydrous ethanol evenly, then add them to the base solution and continue mixing evenly to obtain the final product.

[0044] More preferably, a method for preparing a polyurethane paint composition for cabinets includes the following steps:

[0045] 1) By weight, take 220 parts of polyester polyol, 150 parts of nano silica, 550 parts of butyl acetate, 25 parts of furan polymer, 10 parts of leveling agent, 3.5 parts of defoamer and 5 parts of dispersant and mix them evenly to prepare the base liquid.

[0046] 2) Mix 65 parts of aliphatic polyisocyanate, 30 parts of maleimide derivative, 6 parts of 2-aldehyde phenylboronic acid, and 60 parts of anhydrous ethanol evenly, then add them to the base solution and continue mixing evenly to obtain the final product.

[0047] Furthermore, the furan polymer is prepared using a method comprising the following steps:

[0048] S1: Hydroxyl-terminated polyethylene glycol and methylchlorosulfonic acid are reacted to obtain intermediate material;

[0049] S2: The intermediate material and furfuryl alcohol are subjected to an ester exchange reaction to obtain the product.

[0050] Furthermore, in step 1), the polyester polyol is at least one of NL387 polyester polyol and PVR polyester polyol.

[0051] Furthermore, in step 1), the polyester polyol is composed of NL387 polyester polyol and PVR polyester polyol in a mass ratio of 160-165:50-60.

[0052] In some specific embodiments, in step 1), under normal circumstances, when the polyester polyol is composed of NL387 polyester polyol and PVR polyester polyol in a mass ratio of 162:58, better experimental results can be obtained.

[0053] Furthermore, in step 1), the average particle size of the nano-silica is 50-100 nm.

[0054] Furthermore, in step 1), the leveling agent is an organosilicon leveling agent.

[0055] Furthermore, in step 1), the defoamer is a polyvinyl ether defoamer.

[0056] Furthermore, in step 2), the maleimide derivative is prepared by reacting maleimide with polyetheramine.

[0057] Furthermore, the molecular weight of the polyetheramine is 230-600.

[0058] In some specific embodiments, better experimental results can be obtained when the molecular weight of the polyetheramine is 230.

[0059] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0060] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0061] Example 1

[0062] The method for preparing the polyurethane paint composition for cabinets in this embodiment includes the following steps:

[0063] 1) Accurately weigh 220g of polyester polyol, 150g of nano silica, 550g of butyl acetate, 25g of furan polymer, 10g of leveling agent, 3.5g of defoamer, and 5g of dispersant, and mix them in a high-speed mixer at a speed of 2000r / min for 1.5h to obtain the base liquid;

[0064] 2) Mix 65g of aliphatic polyisocyanate, 30g of maleimide derivative, 6g of 2-aldehyde phenylboronic acid and 60g of anhydrous ethanol at a speed of 1000r / min for 30min, then add to the base liquid and continue mixing for 30min to obtain the final product.

[0065] The furan polymer in this embodiment is prepared by a method including the following steps:

[0066] S1: Dissolve 0.1 mol of hydroxyl-terminated polyethylene glycol (polyethylene glycol chain molecular weight is 400) and 0.25 mol of methylchlorosulfonic acid in tetrahydrofuran solution, use DMAP as catalyst, carry out esterification reaction, and remove the solvent to obtain intermediate material;

[0067] S2: Dissolve 0.2 mol of intermediate material and 0.25 mol of furfuryl alcohol in tetrahydrofuran solution, add NaH and tetrabutylammonium bromide, and reflux to carry out transesterification reaction to obtain the product.

[0068] The maleimide derivative of this embodiment was prepared by the following method: 20 mL of triethylamine was added to 150 mL of toluene, followed by the slow addition of 0.15 mol of methanesulfonic acid, then the slow addition of 0.05 mol of polyetheramine (D230), followed by stirring to dissolve, then the addition of 0.15 mol of maleic anhydride, and a small amount of polymerization inhibitor. The mixture was refluxed at 140 °C, the organic layer was washed with deionized water and dilute sodium hydroxide solution, and then dried, filtered, and rotary evaporated to obtain the final product.

[0069] The polyester polyol in this embodiment consists of 162g of NL387 polyester polyol and 58g of PVR polyester polyol. The average particle size of the nano-silica is 50nm. The leveling agent is an organosilicon leveling agent, model BYK-333. The defoamer is a polyvinyl ether defoamer, model BYK-52. The aliphatic polyisocyanate is HDI.

[0070] Example 2

[0071] The method for preparing the polyurethane paint composition for cabinets in this embodiment includes the following steps:

[0072] 1) Accurately weigh 220g of polyester polyol, 150g of nano silica, 550g of butyl acetate, 25g of furan polymer, 10g of leveling agent, 3.5g of defoamer, and 5g of dispersant, and mix them in a high-speed mixer at a speed of 2000r / min for 1.5h to obtain the base liquid;

[0073] 2) Mix 65g of aliphatic polyisocyanate, 30g of maleimide derivative, 6g of 2-aldehyde phenylboronic acid and 60g of anhydrous ethanol at a speed of 1000r / min for 30min, then add to the base liquid and continue mixing for 30min to obtain the final product.

[0074] The furan polymer in this embodiment is prepared by a method including the following steps:

[0075] S1: Dissolve 0.1 mol of hydroxyl-terminated polyethylene glycol (polyethylene glycol chain molecular weight is 800) and 0.25 mol of methylchlorosulfonic acid in tetrahydrofuran solution, use DMAP as catalyst to carry out esterification reaction, and remove the solvent to obtain intermediate material;

[0076] S2: Dissolve 0.2 mol of intermediate material and 0.25 mol of furfuryl alcohol in tetrahydrofuran solution, add NaH and tetrabutylammonium bromide, and reflux to carry out transesterification reaction to obtain the product.

[0077] The maleimide derivative of this embodiment was prepared by the following method: 25 mL of triethylamine was added to 200 mL of toluene, followed by the slow addition of 0.15 mol of methanesulfonic acid, then the slow addition of 0.05 mol of polyetheramine (D600), and the mixture was stirred to dissolve. Then, 0.15 mol of maleic anhydride and a small amount of polymerization inhibitor were added, and the mixture was refluxed at 140 °C. The organic layer was washed with deionized water and a dilute sodium hydroxide solution, and then dried, filtered, and evaporated by rotary evaporation to obtain the final product.

[0078] The polyester polyol in this embodiment consists of 162g of NL387 polyester polyol and 58g of PVR polyester polyol. The average particle size of the nano-silica is 50nm. The leveling agent is an organosilicon leveling agent, model BYK-333. The defoamer is a polyvinyl ether defoamer, model BYK-52. The aliphatic polyisocyanate is HDI.

[0079] Control group 1

[0080] The preparation method of the polyurethane paint composition for cabinets in this control group includes the following steps:

[0081] 1) Accurately weigh 220g of polyester polyol, 150g of nano silica, 550g of butyl acetate, 25g of furfuryl alcohol, 10g of leveling agent, 3.5g of defoamer, and 5g of dispersant, and mix them in a high-speed mixer at a speed of 2000r / min for 1.5h to obtain the base liquid;

[0082] 2) Mix 65g of aliphatic polyisocyanate, 30g of maleimide derivative, 6g of 2-aldehyde phenylboronic acid and 60g of anhydrous ethanol at a speed of 1000r / min for 30min, then add to the base liquid and continue mixing for 30min to obtain the final product.

[0083] The maleimide derivative in this control group was prepared by the following method: 20 mL of triethylamine was added to 150 mL of toluene, followed by the slow addition of 0.15 mol of methanesulfonic acid, then the slow addition of 0.05 mol of polyetheramine (D230), followed by stirring to dissolve, then the addition of 0.15 mol of maleic anhydride, and a small amount of polymerization inhibitor. The mixture was refluxed at 140 °C, the organic layer was washed with deionized water and dilute sodium hydroxide solution, and then dried, filtered, and rotary evaporated to obtain the final product.

[0084] The polyester polyols in this control group consisted of 162g of NL387 polyester polyol and 58g of PVR polyester polyol. The average particle size of the nano-silica was 50nm. The leveling agent was an organosilicon leveling agent, model BYK-333. The defoamer was a polyvinyl ether defoamer, model BYK-52. The aliphatic polyisocyanate was HDI.

[0085] Control group 2

[0086] The preparation method of the polyurethane paint composition for cabinets in this control group includes the following steps:

[0087] 1) Accurately weigh 220g of polyester polyol, 150g of nano silica, 550g of butyl acetate, 25g of furan polymer, 10g of leveling agent, 3.5g of defoamer, and 5g of dispersant, and mix them in a high-speed mixer at a speed of 2000r / min for 1.5h to obtain the base liquid;

[0088] 2) Mix 65g of aliphatic polyisocyanate, 30g of maleimide, 6g of 2-aldehyde phenylboronic acid and 60g of anhydrous ethanol at 1000r / min for 30min, then add to the base solution and continue mixing for 30min to obtain the final product.

[0089] The furan polymer in this control group was prepared using a method comprising the following steps:

[0090] S1: Dissolve 0.1 mol of hydroxyl-terminated polyethylene glycol (polyethylene glycol chain molecular weight is 400) and 0.25 mol of methylchlorosulfonic acid in tetrahydrofuran solution, use DMAP as catalyst, carry out esterification reaction, and remove the solvent to obtain intermediate material;

[0091] S2: Dissolve 0.2 mol of intermediate material and 0.25 mol of furfuryl alcohol in tetrahydrofuran solution, add NaH and tetrabutylammonium bromide, and reflux to carry out transesterification reaction to obtain the product.

[0092] The polyester polyols in this control group consisted of 162g of NL387 polyester polyol and 58g of PVR polyester polyol. The average particle size of the nano-silica was 50nm. The leveling agent was an organosilicon leveling agent, model BYK-333. The defoamer was a polyvinyl ether defoamer, model BYK-52. The aliphatic polyisocyanate was HDI.

[0093] Performance testing

[0094] The polyurethane paint compositions for cabinets from Examples 1-2 and Comparative Examples 1-2 were sprayed onto clean 10×10cm glass slides and cured at 70°C to form a coating. The coating volume for each glass slide was 15mL. The wettability of the sample surface was standardized using an optical contact angle meter at room temperature. The test sample was soybean oil, with oil droplets of 5μL. The oil droplets were stabilized on the horizontally placed coating surface using the pendant drop method, and then photographs were taken and the contact angle was measured. The test results are as follows: Figure 1 As shown, the top left is Example 1, the top right is Example 2, the bottom left is Control Group 1, and the bottom right is Control Group 2. It can be seen that the wetting state of oil droplets on the coating surface reflects a better oil-repellent effect.

[0095] The morphology of the coating surfaces in Examples 1-2 was observed using atomic force microscopy, and the results are as follows: Figure 2 As shown, the coating surface has a micro-nano textured structure, which can achieve a good water and oil repellency effect.

[0096] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. In a process for the preparation of a polyurethane paint composition for cabinets, characterized by: The method comprises the following steps: 1) uniformly mixing 210-230 parts by weight of polyester polyol, 140-160 parts by weight of nano-silica, 530-560 parts by weight of butyl acetate, 20-30 parts by weight of furan polymer, 5-10 parts by weight of leveling agent, 3-5 parts by weight of defoaming agent and 2-5 parts by weight of dispersing agent to obtain a base solution; 2) uniformly mixing 60-75 parts by weight of aliphatic polyisocyanate, 25-35 parts by weight of maleimide derivative, 5-7.5 parts by weight of 2-aldehyde benzene boronic acid and 50-70 parts by weight of anhydrous ethanol, and then adding the mixture into the base solution and uniformly mixing to obtain the product; The furan polymer is prepared by the method comprising the following steps: S1: reacting hydroxyl-terminated polyethylene glycol with methyl chlorosulfonic acid to obtain an intermediate; S2: performing ester exchange reaction on the intermediate and furfuryl alcohol to obtain the product; In the step 2), the maleimide derivative is prepared by reacting maleimide with polyether amine.

2. The method for preparing a polyurethane paint composition for a cabinet according to claim 1, characterized by: In the step 1), the polyester polyol is at least one of NL387 polyester polyol and PVR polyester polyol.

3. The method of preparing a polyurethane paint composition for cabinets according to claim 2, characterized by: In the step 1), the polyester polyol is composed of NL387 polyester polyol and PVR polyester polyol at a mass ratio of 160-165:50-60.

4. The method of preparing a polyurethane paint composition for a cabinet according to claim 1, characterized by: In the step 1), the average particle size of the nano-silica is 50-100 nm.

5. The method of preparing polyurethane paint composition for cabinet according to claim 1, characterized in that: In the step 1), the leveling agent is a silicone leveling agent.

6. The method of preparing polyurethane paint composition for cabinet according to claim 1, characterized in that: In the step 1), the defoaming agent is a polyvinyl ether defoaming agent.

7. The method of preparing polyurethane paint composition for cabinet according to claim 1, characterized in that: The molecular weight of the polyether amine is 230-600.

8. A polyurethane paint composition for cabinets, characterized by: The product is prepared by the method of any one of claims 1-7.

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