Reaction type organosilicon surface auxiliary agent and preparation method and application thereof

Abstract

The invention provides a reaction type organosilicon surface auxiliary agent, a water-based UV-curable anti-doodling coating, and a preparation method and application of the water-based UV-curable anti-doodling coating. The reaction type organosilicon surface auxiliary agent is prepared from the following raw materials: hydrogen-containing polysiloxane, unsaturated fatty acid amide, alkenyl-containing polyether, hydroxyl-containing acrylate and isocyanate-based acrylate. The water-based UV anti-doodling coating comprises the following components in percentage by weight: 70-80 wt% of water-based UV resin; 1 to 6 wt% of an anti-graffiti auxiliary agent; 1-6 wt% of an alcohol ether solvent; 1 to 5 wt% of a photoinitiator; wherein the water-based UV resin comprises organic silicon modified water-based polyurethane acrylate resin, and the functionality degree of the organic silicon modified water-based polyurethane acrylate resin is 6 to 10; wherein the anti-doodling auxiliary agent comprises the reaction type organic silicon surface auxiliary agent. After the water-based UV anti-doodling coating provided by the invention is subjected to UV light curing, a coating film has the characteristics of good transparency, good doodling resistance, good wear resistance and the like.

Description

[0001] This application is a divisional application of the invention patent application with the application date of 2023-06-29, application number CN202310784114.9, and invention name "Reactive silicone surface additive, water-based UV light-curing anti-graffiti coating and its preparation method and application". Technical Field

[0002] The invention belongs to the technical field of organic silicon, and in particular relates to a reactive organic silicon surface additive and a preparation method and application thereof. Background Art

[0003] Anti-graffiti coatings are isolation and protection coatings. When applied to the surface of the protected substrate, they can form a coating film with low surface tension, which can play a role in anti-graffiti and anti-fouling. Anti-graffiti coatings have the following characteristics: low surface energy of the coating, making graffiti or pasting difficult; pollution attached to the surface of the coating is easy to remove, etc. After years of development, anti-graffiti coatings have been widely used in kitchen supplies, construction, municipal facilities, 3C electronic products and other fields. Most 3C electronic products are mainly made of plastic and rubber-coated composite materials, and the coatings they are coated with have a great impact on the performance, appearance and service life of the products. Improving the anti-fouling and anti-graffiti properties of the surface of 3C electronic products has always been a hot spot and difficulty in coating research. At present, the anti-graffiti coatings used on plastic surfaces are generally UV light-curing systems.

[0004] UV coating is an energy-saving coating that uses ultraviolet light to cure. It has a fast curing speed and good curing performance, making it very suitable for high-speed automated production. It is the main substitute for traditional coatings and has been widely used in the field of 3C products. Compared with solvent-based UV coatings, water-based UV coatings do not contain organic solvents and are more environmentally friendly, so they have become the focus of current research.

[0005] CN116218350A discloses a water-based UV coating and its application. The raw material components of the water-based UV coating include: 40 to 65 parts of water-based UV resin, 5 to 20 parts of water-based single-component acrylic resin, 0.2 to 2 parts of polydimethylsiloxane, 0.1 to 1.5 parts of water-based wetting agent, 0.1 to 1 part of water-based defoaming agent, 0.2 to 2 parts of leveling agent, 0.2 to 2 parts of water-based rheological additive, 1 to 5 parts of photoinitiator, 0.1 to 1 part of pH regulator, 2 to 15 parts of water-based film-forming additive, and 5 to 20 parts of water.

[0006] Although the above-mentioned water-based UV resin has a good anti-graffiti effect, it achieves good anti-graffiti performance by physically blending multiple water-based resins and polydimethylsiloxane, resulting in a large difference in polarity of each component of the coating system, resulting in compatibility problems, and the coating film tends to become hazy and opaque after curing. Ordinary water-based UV resins are difficult to achieve long-term anti-graffiti and wear resistance alone. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of the existing water-based anti-graffiti coating after curing, such as the coating film becoming cloudy, poor transparency, poor wear resistance, etc., and to provide a reactive silicone surface additive, a water-based UV anti-graffiti coating, and a preparation method and application thereof. The water-based UV anti-graffiti coating has high transparency, long-term anti-graffiti performance and wear resistance.

[0008] The first aspect of the present invention provides a reactive organosilicon surface additive, the raw materials for preparing the reactive organosilicon surface additive include hydrogen-containing polysiloxane, unsaturated fatty acid amide, alkenyl-containing polyether, hydroxyl-containing acrylate and isocyanate-based acrylate.

[0009] The reactive organosilicon surface additive provided by the present invention has a polysiloxane segment main chain, and has a polyether segment side chain, a fatty acid amide side chain, an acryloxy side chain and a carbamate group, can provide lower surface tension, internal lubrication effect and hydrogen bonding effect, improve the anti-graffiti and wear resistance of the coating, can be grafted into the photocurable resin through the acryloxy group, has excellent compatibility with organosilicon-modified polyurethane acrylic resin and other organosilicon additives, and can be applied to UV polyurethane acrylic resin system.

[0010] Preferably, the raw materials for preparing the unsaturated fatty acid amide include: unsaturated fatty acids and polyene polyamines.

[0011] Preferably, the molar ratio between the unsaturated fatty acid and the polyene polyamine is 1:(0.8-1.2).

[0012] Preferably, the unsaturated fatty acid is selected from at least one of tung oil, linoleic acid, linolenic acid and soybean oil acid.

[0013] Preferably, the polyene polyamine is selected from at least one of diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

[0014] Preferably, the hydroxyl-containing acrylate is selected from at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.

[0015] Preferably, the isocyanate acrylate is selected from isocyanate ethyl acrylate and / or isocyanate ethyl methacrylate.

[0016] In a second aspect of the present invention, the present invention provides a method for preparing a reactive organosilicon surface additive, the preparation method comprising the following steps: S1. After the hydrogen-containing silicone oil is subjected to a hydrosilylation reaction with an allyl polyether and a hydroxyl-containing acrylate, an unsaturated fatty acid amide is added to continue the hydrosilylation reaction to obtain an intermediate; S2. reacting the intermediate with isocyanate acrylate to obtain the reactive organosilicon surface additive.

[0017] Preferably, in step S1, the molar ratio between the silyl groups and the unsaturated groups in the preparation raw material is 1:(0.8-1.3).

[0018] Preferably, in step S1, the molar ratio of the allyl polyether, the unsaturated fatty acid amide and the hydroxyl-containing acrylate is (0.3-0.5): (0.1-0.2): (0.2-0.4).

[0019] Preferably, in step S2, the ratio of the sum of the molar amount of hydroxyl groups and the molar amount of amino groups to the molar amount of isocyanate groups is 1:(0.5-1.1).

[0020] Preferably, the above-mentioned preparation raw materials also include a catalyst.

[0021] Preferably, the amount of the catalyst added is 0.05-0.5 wt % relative to the total weight of the intermediate and the isocyanate acrylate.

[0022] Preferably, the unsaturated fatty acid amide can be prepared by the following preparation method: It is obtained by polymerization of unsaturated fatty acids and polyene polyamines.

[0023] Preferably, the reaction temperature is 150-180°C.

[0024] Preferably, the reaction is carried out under vacuum to remove water.

[0025] The third aspect of the present invention provides a water-based UV anti-graffiti coating, which comprises the following components in weight percentage based on the total weight of the water-based UV anti-graffiti coating being 100wt%: Water-based UV resin: 70~80wt%; Anti-graffiti additive: 1~6wt%; Alcohol ether solvents: 1~6wt%; Photoinitiator: 1~5wt%; Water: balance; Wherein, the water-based UV resin includes an organosilicon-modified water-based polyurethane acrylate resin, wherein the functionality of the organosilicon-modified water-based polyurethane acrylate resin is 6-10; for example, it can be 7-official, 8-official, 9-official, etc.; Wherein, the anti-graffiti additive includes the above-mentioned reactive organic silicon surface additive or the reactive organic silicon surface additive obtained according to the above-mentioned preparation method.

[0026] For example, the weight percentage of the water-based UV resin can be 71wt%, 72wt%, 73wt%, 74wt%, 75wt%, 76wt%, 77wt%, 78wt%, 79wt%, etc.

[0027] The wt% of the anti-graffiti additive can be 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt%, 5wt%, 5.5wt%, etc.

[0028] The wt% of the alcohol ether solvent can be 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt%, 5wt%, 5.5wt%, etc.

[0029] The wt% of the photoinitiator can be 1.5wt%, 2wt%, 2.5wt%, 3wt%, 3.5wt%, 4wt%, 4.5wt%, etc.

[0030] The present invention adopts a high-functionality organic silicon modified waterborne polyurethane acrylate resin and an anti-graffiti auxiliary agent for compounding and adding an alcohol ether solvent, so that the obtained paint film is dense, transparent, and has good anti-graffiti and wear resistance. The organic silicon modified waterborne polyurethane acrylate with a functionality of 6-10 has both a dense coating film brought by high functionality and softness and low surface energy brought by organic silicon segments. The anti-graffiti auxiliary agent has an organic silicon main chain and a fatty acid amide side chain. After curing, it is grafted into the organic silicon modified waterborne polyurethane acrylate through an acryloyloxy group, and is entangled with the chain segments of the organic silicon modified waterborne polyurethane acrylate, which together play the role of internal lubrication and reducing the surface energy of the coating. In addition, the polyether chain segment, acryloyloxy group and carbamate group of the anti-graffiti auxiliary agent make it have excellent compatibility with the organic silicon modified waterborne polyurethane acrylate. After adding the alcohol ether solvent, the obtained coating film has high transparency and will not be whitish or hazy.

[0031] Preferably, for 100 wt % of the solid content of the silicone-modified waterborne polyurethane acrylate resin, the silicone content is 7-15 wt %, for example, 8 wt %, 9 wt %, 10 wt %, 11 wt %, 12 wt %, 13 wt %, 14 wt %, etc.

[0032] The use of a silicone-modified waterborne polyurethane acrylate resin with a silicone content of 7 to 15 wt% can make the coating have good transparency and graffiti resistance at the same time. The inventors found that when a silicone-modified waterborne polyurethane acrylate resin with too high a silicone content is used, the transparency of the obtained coating decreases, while when a silicone-modified waterborne polyurethane acrylate resin with too low a silicone content is used, the flexibility and graffiti resistance of the obtained coating decrease.

[0033] Preferably, the solid content of the water-based silicone-modified water-based polyurethane acrylate resin is 40-65wt%, for example, it can be 41wt%, 42wt%, 45wt%, 48wt%, 50wt%, 52wt%, 55wt%, 57wt%, 58wt%, 60wt%, 62wt%, 63wt%, etc.

[0034] Preferably, when the total weight of the water-based UV anti-graffiti coating is 100wt%, the water-based UV curable anti-graffiti coating further comprises 0.5-4wt% of an auxiliary agent.

[0035] Preferably, the auxiliary agent includes one or more of a leveling agent, a wetting agent, a defoaming agent, and a thickener.

[0036] Preferably, the leveling agent includes one or more of reactive silicone-fluoropolymer, hydroxyl polyether polyester copolymer-modified polysiloxane, polyether-modified polydimethylsiloxane, polyether-modified polyorganosiloxane, and polyether polyester copolymer-modified silicone.

[0037] For example, the leveling agent may include Silok3555, Silok8200, Silok8245, Silok8266, Silok8277 and Silok8300B produced by Guangzhou Silok High Molecular Polymer Co., Ltd.

[0038] Preferably, the wetting agent comprises polyether-modified polyorganosiloxane.

[0039] For example, the wetting agent may include Silok8000, Silok8002, Silok8008, Silok8009, Silok8066, Silok8018, Silok8104E, Silok8141, Silok8240 and Silok8241 manufactured by Guangzhou Silok High Molecular Polymer Co., Ltd.

[0040] Preferably, the photoinitiator includes one or more of 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure 2959), 1-hydroxycyclohexylphenyl ketone (Irgacure 184), phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (Irgacure 819DW), MC-299, and α-hydroxyisobutyrophenone (Irgacure 1173).

[0041] In a preferred embodiment of the present invention, the water-based UV anti-graffiti paint further comprises matting powder.

[0042] Furthermore, relative to 100wt% of the water-based UV anti-graffiti paint, the added amount of the matting powder is 1-5wt%.

[0043] In a preferred embodiment of the present invention, the water-based UV resin is selected from WinWin7005 and / or WinWin7002 sold by Guangzhou Blue Algae New Material Technology Service Co., Ltd.

[0044] Through screening, using WinWin7002 and / or WinWin7005 of Guangzhou Blue Algae New Material Technology Service Co., Ltd. as the main resin can not only achieve better anti-graffiti performance, but also obtain a coating film with excellent transparency.

[0045] Specifically, the functionality of cyanobacteria WinWin7002 is 6, the weight percentage of silicone content relative to the resin solids is 10wt%, and the solid content is 65wt%; the functionality of cyanobacteria WinWin7005 is 8-10, the weight percentage of silicone content relative to the resin solids is 10%, and the solid content is 40wt%.

[0046] A fourth aspect of the present invention provides a method for preparing the above-mentioned water-based UV anti-graffiti coating, the preparation method comprising the following steps: uniformly mixing a water-based UV resin, an anti-graffiti additive, an alcohol ether solvent, a photoinitiator and water to obtain the water-based UV anti-graffiti coating.

[0047] In a preferred embodiment of the present invention, the preparation method further comprises the step of adding auxiliary agents and matte powder.

[0048] The fifth aspect of the present invention also provides the use of the water-based UV anti-graffiti coating on the surface of a plastic substrate.

[0049] The plastic substrate may be polycarbonate (PC), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyethylene (PE), polystyrene (PS), or ABS substrate.

[0050] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a 6-10-functionality organosilicon-modified polyurethane acrylate resin PUA as a film-forming resin, and compounded with a reactive anti-graffiti auxiliary agent having a polysiloxane segment main chain, a polyether segment side chain, a fatty acid amide side chain and an acryloxy group and a carbamate group, and adds an alcohol ether solvent as a solubilizer, thereby developing a water-based UV anti-graffiti coating with high transparency, good long-term anti-graffiti performance and good wear resistance, which can be widely applied to plastic substrates to improve the anti-graffiti performance and wear resistance. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below in conjunction with specific embodiments. The given examples are only for illustrating the present invention, but not for limiting the scope of the present invention.

[0052] A method for preparing a reactive organosilicon surface additive comprises the following steps: (1) 75 g of linoleic acid and 31 g of diethylenetriamine were added to a reaction kettle, stirred, heated to 170°C, and vacuumed to remove the water generated by the reaction. The reaction was continued for 5 h, and heating was stopped to obtain linoleic acid amide; (2) 333 g of hydrogenated silicone oil (molecular weight 2000, hydrogen content 0.3 wt%) (1 mol) was added to a reaction kettle, stirred, nitrogen was introduced, 34.8 g of hydroxyethyl acrylate, 350 g of allyl polyether (molecular weight 700, EO / PO=0 / 16, terminal group is hydroxyl) and a platinum catalyst (1 wt% chloroplatinic acid isopropanol solution) were added, the temperature was raised to 90°C, reacted for 2 h, 55.6 g of linolenic acid amide was added, and the reaction was continued for 3 h to obtain an intermediate; (3) Cooling to 65°C, adding hydroquinone, and then dropping isocyanate ethyl acrylate and dibutyltin dilaurate. After keeping the temperature for 2 hours, stop heating to obtain a reactive silicone surface additive. Example 1

[0053] This embodiment prepares the water-based UV anti-graffiti coating of the present invention, including the following components:

[0054] Water-based UV resin: 75g; Anti-graffiti additive: 2g Alcohol ether solvent: 4g; Photoinitiator: 3g; Leveling agent: 1g; Wetting agent: 1g; Thickener: 1.5g; Water: Add to 100g.

[0055] The waterborne UV resin is a mixture of a 6-functionality silicone-modified waterborne polyurethane acrylate resin and a 8-10-functionality silicone-modified waterborne polyurethane acrylate resin in a weight ratio of 1:3, wherein the 6-functionality silicone-modified waterborne polyurethane acrylate resin is named WinWin7002 (Guangzhou Lanzao New Material Technology Service Co., Ltd.), and the 8-10-functionality silicone-modified waterborne polyurethane acrylate resin is named WinWin7005 (Guangzhou Lanzao New Material Technology Service Co., Ltd.); The anti-graffiti additive is the reactive organic silicon surface additive obtained in Preparation Example 1; The alcohol ether solvent is ethylene glycol monobutyl ether; The photoinitiator is a mixture of irgacure819DW and MC-299 in a weight ratio of 1:1; The leveling agent is polyether-modified polyorganosiloxane, brand Silok8266; The wetting agent is polyether-modified polyorganosiloxane, brand Silok8002; The defoamer is BYK 011; The thickener is Dow RM-8W.

[0056] The preparation method of the water-based UV anti-graffiti coating comprises the following steps: adding water-based UV resin, alcohol ether solvent, photoinitiator, leveling agent, wetting agent, anti-graffiti additive, matting powder and water into a mixing tank, stirring for mixing, stirring at a speed of 800 rpm for 15 minutes, adding a thickener to adjust the viscosity, adding a defoamer to defoam, and adjusting the pH of the mixture to 7.5, so as to obtain the water-based UV anti-graffiti coating. Example 2

[0057] This embodiment prepares the water-based UV anti-graffiti coating of the present invention, which includes the following components based on the total weight percentage of 100%: Water-based UV resin: 80g; Alcohol ether solvent: 5g; Photoinitiator: 2g; Leveling agent: 0.5g; Anti-graffiti additive: 3g; Defoaming agent: 0.1g; Thickener: 0.5g; Matting powder: 2g; Water: Add to 100g.

[0058] Among them, the water-based UV resin is a silicone-modified water-based polyurethane acrylate resin with a functionality of 8-10, and the brand name is Blue Algae WinWin7005; The alcohol ether solvent is ethylene glycol monobutyl ether; The photoinitiator was Irgacure 2959; The leveling agent is a reactive fluorosilicone polymer, brand Silok3555; The anti-graffiti additive is the reactive organic silicon surface additive obtained in Preparation Example 1; The defoamer is BYK 011; The thickener is Dow RM-8W; The matting powder is Nipsil K-500.

[0059] The preparation method of the water-based UV anti-graffiti coating comprises the following steps: adding water-based UV resin, alcohol ether solvent, photoinitiator, leveling agent, wetting agent, anti-graffiti additive, and water into a mixing tank, stirring for mixing, stirring at 400 rpm for 15 minutes, adding a thickener to adjust the viscosity, adding a defoamer to defoam, and adjusting the pH of the mixture to 7.5, so as to obtain the water-based UV anti-graffiti coating. Example 3

[0060] This embodiment prepares the water-based UV anti-graffiti coating of the present invention, including the following components in weight percentage: Water-based UV resin: 70g; Anti-graffiti additive: 6g; Alcohol ether solvent: 2g; Photoinitiator: 5g; Leveling agent: 0.3g; Wetting agent: 0.1g; Matting powder: 3g; Thickener: 0.3g; Water: Add to 100g.

[0061] Among them, the water-based UV resin is a 6-functionality silicone-modified water-based polyurethane acrylate resin with the brand name WinWin7002 (Guangzhou Blue Algae New Materials Technology Service Co., Ltd.); The anti-graffiti additive is the reactive organic silicon surface additive obtained in Preparation Example 1; The alcohol ether solvent is ethylene glycol monobutyl ether; The photoinitiator was Irgacure184; The leveling agent is hydroxyl polyether polyester copolymer modified polysiloxane, brand Silok8200; The wetting agent is polyether-modified polyorganosiloxane, brand Silok8000; The matting powder is Nipsil K-500; The defoamer is BYK 011; The thickener is Dow RM-8W. Comparative Example 1

[0062] A water-based UV anti-graffiti coating was prepared in the same manner as in Example 1, except that the water-based UV resin was replaced with an organosilicon-modified water-based polyurethane acrylate resin having the same weight and the same silicon content and a functionality of 3, specifically WinWin7001 from Guangzhou Blue Algae New Materials Technology Service Co., Ltd. Comparative Example 2

[0063] A water-based UV anti-graffiti coating was prepared in the same manner as in Example 1, except that no anti-graffiti additive was added. Comparative Example 3

[0064] A water-based UV anti-graffiti coating was prepared in the same manner as in Example 1, except that the anti-graffiti additive added was polyether-modified polydimethylsiloxane containing acrylate functional groups (BYK-UV3575). Comparative Example 4

[0065] A water-based UV anti-graffiti coating was prepared in the same manner as in Example 1, except that the amount of the anti-graffiti additive was changed to 10 g.

[0066] Performance Test: The water-based UV anti-graffiti coatings prepared in the above Examples 1-3 and Comparative Examples 1-5 were coated on PC boards using a 10 μm screw, pre-baked at 60° C. for 60 min, and then cured under UV light with a wavelength of 800 mj to form a film. The anti-graffiti, wear resistance and transparency were tested, and the test results are shown in Table 1. The test method is as follows: Anti-graffiti: Use an oil-based marker to graffiti on the surface of the coating, wipe it off with a dry cloth after it dries, and repeat until there are obvious residual marks after wiping. The test results are divided into 1-4 levels according to the number of repeated times of residual marks, among which level 5 represents more than 10 times; level 4 represents more than 7 times and less than 10 times; level 3 represents more than 5 times and less than 7 times; level 2 represents more than 2 times and less than 5 times; level 1 represents less than 2 times.

[0067] Abrasion resistance: A rubber alcohol friction tester was used, with a wear-resistant rubber strip and a 500g load applied. The coating surface was rubbed back and forth. The number of frictions was set to 500, 1000, 1500 and 2000 times respectively. The coating was observed for damage or scratches at 500, 1000, 1500 and 2000 times respectively. When the coating was damaged or scratched, the test was stopped and the results were divided into the following levels: Level 1 represents less than 500 times; Level 2 represents more than 500 times and less than 1000 times; Level 3 represents less than 1500 times and more than 1000 times; Level 4 represents more than 1500 times and less than 2000 times; Level 5 represents more than 2000 times.

[0068] Transparency: According to the appearance of the coating, the transparency of the coating is divided into 1-4 levels, among which 4 is excellent transparency; 3 is good transparency; 2 is general transparency; 1 is poor transparency and hazy.

[0069]

[0070] The above test results show that the components of the water-based UV curable anti-graffiti coating obtained in the embodiment of the present invention have good compatibility, the obtained cured coating film has good transparency, and the main resin and the anti-graffiti additive are matched to obtain a coating with wear resistance and anti-graffiti properties.

[0071] It can be seen from the comparison between Comparative Example 1 and Example 1 that when the functionality of the main resin used is low, the anti-graffiti and abrasion resistance of the obtained coating film are reduced.

[0072] Comparison of Comparative Example 2 with Example 1 shows that when no anti-graffiti additive is added, the transparency of the obtained coating decreases, and the anti-graffiti property and abrasion resistance also decrease.

[0073] Comparison of Comparative Example 3 with Example 1 shows that when the structure of the anti-graffiti additive used is not the structure defined in the present invention, the transparency, abrasion resistance and anti-graffiti property of the obtained coating film are all reduced.

[0074] It can be seen from the comparison between Comparative Example 4 and Example 1 that when the amount of the anti-graffiti additive added is too much, it will have a negative impact on the performance and cause the performance to deteriorate.

[0075] The above embodiments are only preferred embodiments of the present invention and do not have any limiting effect on the present invention. Without departing from the scope of the technical solution of the present invention, any equivalent replacement or modification made by any technician in the relevant technical field to the technical solution and technical content disclosed in the present invention does not depart from the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A method for preparing a reactive organosilicon surface additive, characterized in that: The preparation method comprises the following steps: S1. The hydrogen-containing silicone oil and allyl polyether, unsaturated fatty acid amide, hydroxyl-containing acrylate are subjected to a hydrosilylation reaction to obtain an intermediate; S2. reacting the intermediate with isocyanate acrylate to obtain the reactive silicone surface additive; The unsaturated fatty acid amide is prepared by the following preparation method: unsaturated fatty acid and polyene polyamine are polymerized to obtain the unsaturated fatty acid amide.

2. The preparation method according to claim 1, characterized in that: The unsaturated fatty acid is selected from at least one of tung oil, linoleic acid, linolenic acid and soybean oil acid.

3. The preparation method according to claim 1, characterized in that: The polyene polyamine is selected from at least one of diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

4. The preparation method according to claim 1, characterized in that: The hydroxyl-containing acrylate is selected from at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.

5. The preparation method according to claim 1, characterized in that: The isocyanate acrylate is selected from isocyanate ethyl acrylate and / or isocyanate ethyl methacrylate.

6. The preparation method according to claim 1, characterized in that: In step S1, the molar ratio between the silyl group and the unsaturated group in the preparation raw material is 1:(0.8-1.3); Preferably, in step S1, the molar ratio of the allyl polyether, the unsaturated fatty acid amide and the hydroxyl-containing acrylate is (0.3-0.5): (0.1-0.2): (0.2-0.4).

7. The preparation method according to claim 1, characterized in that: In step S2, the ratio of the sum of the molar amount of the hydroxyl group and the molar amount of the amino group to the molar amount of the isocyanate group is 1:(0.5-1.1).

8. The preparation method according to claim 1, characterized in that: The reaction temperature for preparing the unsaturated fatty acid amide is 150-180° C.; the reaction for preparing the unsaturated fatty acid amide is carried out under the condition of vacuum removal of water.

9. A reactive organic silicon surface additive, characterized in that: The reactive organosilicon surface additive is prepared according to the preparation method according to any one of claims 1 to 8.

10. A water-based UV anti-graffiti coating, comprising the following components in weight percentages based on the total weight of the water-based UV anti-graffiti coating being 100 wt %: Water-based UV resin: 70~80wt%; Anti-graffiti additive: 1~6wt%; Alcohol ether solvents: 1~6wt%; Photoinitiator: 1~5wt%; Water: balance; in, The water-based UV resin includes a silicone-modified water-based polyurethane acrylate resin, wherein the functionality of the silicone-modified water-based polyurethane acrylate resin is 6-10; wherein the anti-graffiti additive includes a reactive silicone surface additive obtained by the preparation method according to any one of claims 1-8.

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