A modified melamine coating for household appliances

Abstract

The present invention belongs to the field of functional coatings, and specifically relates to a modified melamine coating for household appliances and a preparation method thereof, wherein the modified melamine coating for household appliances comprises the following raw materials in parts by weight: 20-40 parts of polyester acrylate prepolymer; 15-30 parts of modified melamine monomer; 8-15 parts of UV monomer diluent; 2-5 parts of photoinitiator; 0.1-0.4 parts of leveling agent; residual amount of organic solvent; the total amount of the above components is 100 parts. The modified melamine coating for household appliances is obtained through a paint making process, a coating process, and curing. The modified melamine coating for household appliances of the present invention is designed by formula and matched with a homemade modified melamine monomer, which can effectively improve the deficiencies of the coating used for household appliances in the prior art in terms of antistatic, flame retardant and antibacterial effects.

Description

Technical Field

[0001] The invention belongs to the field of functional coatings, and in particular relates to a modified melamine coating for household appliances. Background Art

[0002] With the development of society and the improvement of living standards, various household appliances, such as refrigerators, washing machines, televisions and even switch panels, are widely used. On the one hand, fires caused by household appliances are becoming more and more common. Among them, fires caused by static electricity are countless. On the other hand, since household appliances are in contact with the human body surface for a long time, the bacteria bred by them can easily enter the human body through direct contact, endangering human health.

[0003] The generation of static electricity is inevitable in life and industrial production. Its hazards include: absorbing dust in the air to cause electronic equipment failure or electromagnetic interference, breaking down integrated circuits and precision electronic components, causing component aging, and causing flammable items to catch fire.

[0004] Fires caused by static electricity occur from time to time, and anti-static has become a major means of preventing fires. Giving coatings antistatic properties can effectively prevent fires caused by static electricity, building the first line of defense for flame retardancy and preventing them from "burning". At present, antistatic properties are mainly given to the surface of coatings through antistatic agents. However, conventional metal powder antistatic agents have dispersion problems in coating systems, resulting in poor antistatic effects. After a fire occurs, traditional flame retardant materials have local overheating and poor charring properties, causing flames to pass through the flame retardant materials and continue to ignite other substances; in addition, a large part of flame retardant plastics contain halogen flame retardants, which are easily decomposed during combustion to release toxic gases such as hydrogen halides, which are very harmful to personnel at the fire scene.

[0005] At the same time, the hazards caused by pathogens are common. At the same time, household appliances come into high-frequency contact with different people and the same person every day, and there is a risk of cross-infection. Therefore, antibacterial treatment of the surface of household appliances is urgent.

[0006] Considering that there is a certain connection between static electricity and fire, the requirements for both antistatic and flame retardancy are not contradictory. Melamine, as a structure with high nitrogen content, has multiple pairs of lone pairs of electrons in the ring, which has the possibility of antistatic. At the same time, it has the advantages of high decomposition temperature, low smoke, non-toxicity and low price, and has become the first choice for the current manufacture of halogen-free flame retardants. Therefore, the development of a coating for home appliances with antistatic, excellent flame retardant and antibacterial properties based on melamine has become a hot spot in scientific research and development. Summary of the invention

[0007] The purpose of the present invention is to provide a modified melamine coating for household appliances and a preparation method thereof, in view of the shortcomings of the coating used for household appliances in the prior art in terms of antistatic, flame retardant and antibacterial effects. Through formula design and homemade modified melamine monomer, the problem is solved while having the properties of high wear resistance, high transparency, beautiful appearance and no yellowing.

[0008] To achieve the above purpose, the technical solution adopted by the present invention to solve the technical problem is as follows:

[0009] A method for preparing a modified melamine monomer comprises the following steps:

[0010] (1) mixing the nano hydroxide and the silane coupling agent to carry out a hydrolysis coupling reaction to prepare an intermediate product I;

[0011] (2) the intermediate product I is coupled with melamine under the action of a catalyst, triethylamine A, to prepare an intermediate product II;

[0012] (3) subjecting the intermediate product II to a ring-opening reaction with allyl glycidyl ether under the action of a catalyst, triethylamine B, to prepare an intermediate product III;

[0013] (4) reacting the intermediate product III with DOPO under the initiator AIBN to prepare the intermediate product IV;

[0014] (5) subjecting the intermediate product IV to a ring-opening reaction with isocyanoethyl methacrylate in the presence of a polymerization inhibitor, p-hydroxyanisole, to prepare an intermediate product V;

[0015] (6) The intermediate product V is mixed with a copper salt to carry out a coordination reaction to obtain a modified melamine monomer.

[0016] Further, the nano hydroxide is nano aluminum hydroxide or nano magnesium hydroxide;

[0017] The silane coupling agent is an epoxy silane coupling agent or an acryloxy silane coupling agent.

[0018] Furthermore, the dosage of the nano hydroxide and the silane coupling agent is 100g: 3.0-5.0g.

[0019] Further,

[0020] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0021] The amount of triethylamine A used is 1.0-2.0 wt % of melamine.

[0022] Furthermore, the intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1;

[0023] The amount of triethylamine B used is 1.0-2.0 wt % of allyl glycidyl ether.

[0024] Furthermore, the intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0025] The amount of AIBN used is 1.0-1.5 wt % of DOPO.

[0026] Furthermore, the isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1;

[0027] The dosage of p-hydroxyanisole is 1.0-1.5 wt % of isocyanoethyl methacrylate.

[0028] Furthermore, the copper salt is copper acetate or copper nitrate.

[0029] Furthermore, the usage ratio of the copper salt and the intermediate product V is 10-15g:100g.

[0030] The invention also provides a modified melamine monomer prepared by a method for preparing the modified melamine monomer.

[0031] The present invention also provides a modified melamine coating for household appliances, comprising the following raw materials in parts by weight:

[0032] 20-40 parts of polyester acrylate prepolymer;

[0033] 15-30 parts of modified melamine monomer;

[0034] 8-15 parts of UV monomer diluent;

[0035] 2-5 parts of photoinitiator;

[0036] Leveling agent 0.1-0.4 parts;

[0037] Residue of organic solvent;

[0038] The total amount of the above components is 100 parts.

[0039] Furthermore, the UV monomer diluent is any combination of monofunctional, difunctional, trifunctional, tetrafunctional or hexafunctional.

[0040] Furthermore, the photoinitiator is one or more of BP, 184, 1173 or TPO.

[0041] The present invention also provides a method for preparing a modified melamine coating for household appliances, comprising the following steps:

[0042] Protect from light, keep humidity ≤60%, mix the leveling agent and organic solvent evenly, add polyester acrylate prepolymer, UV monomer diluent and modified melamine monomer to the mixed solvent in sequence, continue to stir evenly, add photoinitiator, stir evenly, filter with filter cloth with a pore size of 1 μm, and obtain modified melamine coating for home appliances.

[0043] The present invention further provides a method for preparing a modified melamine coating for household appliances, comprising the following steps:

[0044] The modified melamine coating for household appliances is evenly coated on the substrate, heated at 80°C for 120s, and the coating layer is irradiated with UV light at an irradiation energy of 400-600mJ / cm 2 , the irradiation time is 30-60s, and the modified melamine coating for household appliances with a dry film thickness of 10-20μm is obtained.

[0045] Furthermore, the substrate is a conventional substrate or a pre-coated substrate.

[0046] Furthermore, the conventional substrate is a plastic substrate or a metal substrate.

[0047] The present invention also provides a use of the modified melamine coating for household appliances, which is only used as the outermost coating.

[0048] The present invention has the following beneficial effects:

[0049] (1) The present invention provides a modified melamine coating for household appliances, wherein the main resin is a polyester acrylate prepolymer. On the one hand, the polyester acrylate prepolymer has relatively high gloss and hardness; on the other hand, the polyester structure also has high adhesion to various substrates.

[0050] (2) The present invention provides a modified melamine coating for household appliances, wherein one of the components of the modified melamine monomer contains nano hydroxide, silane structure, melamine, DOPO, urea bond, copper ion, acryloxy group, hydroxyl group and other structures in its molecular structure.

[0051] First, nano hydroxide can decompose and release water when encountering high temperature or open flame, and absorb a large amount of heat, effectively preventing the spread of flames, and has flame retardancy;

[0052] Second, the silane structure has a certain high temperature resistance on the one hand; on the other hand, it also has low atomic surface energy and has the characteristics of surface migration enrichment;

[0053] Third, on the one hand, melamine is a nitrogen-rich structure, which first has the characteristics of an intumescent flame retardant gas source and has a flame retardant effect; on the other hand, the nitrogen in melamine can form coordination with copper ions, breaking the disadvantage of electron transfer between rings, forming a conductive network chain, and having a highly effective antistatic effect;

[0054] Fourth, DOPO is a new type of reactive flame retardant, which can be synergistically compounded with melamine and other flame retardants, and has excellent flame retardancy;

[0055] Fifth, urea bonds, copper ions and melamine can form copper complexes, so that the organic-modified inorganic microspheres form a "random beaded" structure, which has the following advantages: Advantage 1: It can improve mechanical properties; Advantage 2: It makes the conductive network denser and has better antistatic effect; Advantage 3: Copper ions appear blue, which can delay the yellowing of the coating and make the appearance better; Advantage 4: Copper ions are highly efficient and broad-spectrum antibacterial agents with excellent antibacterial properties;

[0056] Sixth, the modified melamine monomer also contains a large amount of hydroxyl groups to ensure flame retardancy; it contains acryloxy groups to ensure reaction activity and reaction crosslinking degree, thereby improving the mechanical properties of the coating.

[0057] At this point, the modified melamine monomer has the carbon source, acid source, and gas source elements of the intumescent flame retardant, and has excellent flame retardant effect; at the same time, when compounded with nano hydroxide flame retardant, the flame retardant effect is even better. In addition, copper ions have excellent antibacterial properties; and when combined with N, they form an electronic conductive network, which has excellent antistatic properties. DETAILED DESCRIPTION

[0058] The present invention is described in detail below with reference to the examples. However, it should be understood that the following examples are only illustrative of the embodiments of the present invention, and are not intended to limit the scope of the present invention.

[0059] The purpose of the present invention is to develop a coating with antistatic, flame retardant and antibacterial properties to meet its use in the field of household appliances. The idea of ​​implementation is: to make a monomer or small molecule polymer with the above functions, while ensuring its compatibility and dispersibility in the main resin. The theoretical basis for implementation is: through the nitrogen-rich structure of melamine, it has the potential for antistatic and flame retardancy, and through chemical synthesis, it reacts and couples with nano hydroxides and phosphorus-containing structures to improve its flame retardant effect; through further reaction and metal ion formation coordination, the electron transfer pathway is from the ring to the ring and a conductive network is formed to achieve the antistatic effect; at the same time, the metal ion has spectral antibacterial properties; and through reaction coupling of acryloyloxy, it has reactive activity. The modified melamine monomer in the present invention has antistatic, flame retardant and antibacterial properties, and the various structural groups complement each other and synergistically enhance the effect. The coating prepared by it has high efficiency and multifunctionality under the premise of ensuring mechanical properties. The embodiments of the present invention are as follows:

[0060] The embodiment of the present invention provides a method for preparing a modified melamine monomer, comprising the following steps:

[0061] (1) Nano hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 60-80° C. while stirring; a silane coupling agent diluted with anhydrous ethanol A is added, and stirring is continued for 10-20 hours, and then the mixture is cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 6-8 hours, and ground to obtain an intermediate product I;

[0062] The usage ratio of the nano hydroxide, deionized water A, and anhydrous ethanol B is 50 g: 200 mL: 800 mL;

[0063] The dosage of the nano hydroxide and the silane coupling agent is 100g: 3.0-5.0g;

[0064] The volume ratio of the silane coupling agent to anhydrous ethanol A is 1:1;

[0065] (2) adding the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heating to 30-40°C and continuously stirring, slowly adding into a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 40-50°C, after the addition is completed within 2 hours, heating to 50-60°C and continuing stirring for 2-8 hours, distilling under reduced pressure, and vacuum drying at 80°C for 4 hours to obtain the intermediate product II;

[0066] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0067] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0068] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0069] The amount of triethylamine A is 1.0-2.0wt% of melamine;

[0070] (3) Allyl glycidyl ether and N,N-dimethylformamide C are added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 40-50° C. After the addition is completed within 2 hours, stirring is continued for 2-4 hours, and then distilled under reduced pressure and dried in vacuum at 80° C. for 4 hours to obtain intermediate product III;

[0071] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0072] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0073] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1;

[0074] The amount of triethylamine B is 1.0-2.0wt% of allyl glycidyl ether;

[0075] (4) adding the intermediate product III and DOPO to 1,4-dioxane, stirring, then adding AIBN, and incubating in an oil bath at 70-80° C. for 8-12 hours. After the reaction is completed, filtering, distilling under reduced pressure, and vacuum drying are performed to obtain the intermediate product IV;

[0076] The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0077] The usage ratio of DOPO and 1,4-dioxane is 10 g:500 mL;

[0078] The amount of AIBN is 1.0-1.5wt% of DOPO;

[0079] (5) adding isocyanoethyl methacrylate, p-hydroxyanisole, and intermediate product IV to N,N-dimethylformamide E, stirring under magnetic stirring at room temperature for 1-2 hours, and after the reaction is completed, performing reduced pressure distillation and vacuum drying at 60° C. for 8 hours to obtain intermediate product V;

[0080] The isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1;

[0081] The dosage ratio of isocyanoethyl methacrylate and N,N-dimethylformamide F is 10g:600mL;

[0082] The dosage of the p-hydroxyanisole is 1.0-1.5wt% of isocyanoethyl methacrylate;

[0083] (6) The copper salt was dissolved in deionized water B, and the intermediate product V was added to N,N-dimethylformamide F. After blending and ultrasonication for 0.5 h, the mixture was transferred to a reactor. The reactor was completely sealed and stirred at room temperature for 12 h. The concentrate was distilled under reduced pressure, and the concentrate was washed three times with deionized water C and dried at 60° C. for 12 h to obtain the target product.

[0084] The usage ratio of the copper salt, deionized water B, intermediate product V, and N,N-dimethylformamide F is 10-20 g: 50 mL: 100 g: 800 mL.

[0085] The nano hydroxide described in the present invention is nano aluminum hydroxide or nano magnesium hydroxide, and the average particle size is 100nm.

[0086] The nano aluminum hydroxide in the embodiment of the present invention is preferably AH100 produced by Zhengzhou Sanhe New Materials Co., Ltd.

[0087] The nano magnesium hydroxide in the embodiment of the present invention is preferably VK-MHT02 produced by Xuancheng Jingrui New Materials Co., Ltd.

[0088] The silane coupling agent in the present invention is an epoxy silane coupling agent or an acryloxy silane coupling agent.

[0089] The epoxy silane coupling agent described in the present invention can be KH560, KH186, KH561, KH1861, preferably KH560.

[0090] The acryloxysilane coupling agent described in the present invention can be KH570, KH571, KH572, KH573, KH574, preferably KH570.

[0091] The copper salt in the present invention is copper acetate or copper nitrate, preferably anhydrous copper acetate.

[0092] The embodiment of the present invention also provides a modified melamine monomer prepared by a method for preparing a modified melamine monomer.

[0093] The embodiment of the present invention also discloses a modified melamine coating for household appliances, comprising the following raw materials in parts by weight:

[0094] 20-40 parts of polyester acrylate prepolymer;

[0095] 15-30 parts of modified melamine monomer;

[0096] 8-15 parts of UV monomer diluent;

[0097] 2-5 parts of photoinitiator;

[0098] Leveling agent 0.1-0.4 parts;

[0099] Residue of organic solvent;

[0100] The total amount of the above components is 100 parts.

[0101] The polyester acrylate prepolymer in the present invention may be one or more of difunctional, trifunctional, tetrafunctional or hexafunctional.

[0102] The difunctional polyester acrylate prepolymer in the present invention can be Sartomer CN704, Sartomer CN2254, Cytec EB84, Corning Photomer5010, Shimei M2100, Changxing 6331 and the like.

[0103] The trifunctional polyester acrylate prepolymer in the present invention can be Sartomer CN2551, Zhongshan Qianye Synthetic US405, etc.

[0104] The tetrafunctional polyester acrylate prepolymer in the present invention may be Sartomer CNUVP220 or the like.

[0105] The hexafunctional polyester acrylate prepolymer in the present invention may be Sartomer CN2303 or the like.

[0106] The UV monomer diluent described in the present invention is any combination of monofunctional, difunctional, trifunctional, tetrafunctional or hexafunctional.

[0107] The monofunctional UV monomer diluent in the present invention may be HEA, IBOMA, THFA, EOEOEA, and the like.

[0108] The difunctional UV monomer diluent in the present invention may be PDDA, NPGDA, DPGDA, HDDA, TPGDA, and the like.

[0109] The trifunctional UV monomer diluent in the present invention may be EO-TMPTA, PO-TMPTA, PETA, and the like.

[0110] The tetrafunctional UV monomer diluent in the present invention may be PETTA or the like.

[0111] The hexafunctional UV monomer diluent in the present invention may be dipentaerythritol hexaacrylate or the like.

[0112] The photoinitiator in the present invention is one or more of BP, 184, 1173 or TPO.

[0113] The leveling agent in the present invention is 401LS or Tego 2100, preferably 401LS.

[0114] The organic solvent in the present invention is one or more of MIBK, EAc, BAc, PM, and PMA. In the following embodiments of the present invention, EAc and PMA are preferably mixed in a mass ratio of 2:1.

[0115] The embodiment of the present invention also discloses a method for preparing a modified melamine coating for household appliances, comprising the following steps:

[0116] Protect from light, keep humidity ≤60%, mix the leveling agent and organic solvent evenly, add polyester acrylate prepolymer, UV monomer diluent and modified melamine monomer to the mixed solvent in sequence, continue to stir evenly, add photoinitiator, stir evenly, filter with filter cloth with a pore size of 1 μm, and obtain modified melamine coating for home appliances.

[0117] The embodiment of the present invention also provides a method for preparing a modified melamine coating for household appliances, comprising the following steps:

[0118] Adjust the modified melamine paint for household appliances to the construction viscosity, spray it evenly on the substrate, heat it at 80℃ for 120s, and irradiate the coating layer with UV at an irradiation energy of 400-600mJ / cm 2 , the irradiation time is 30-60s, and the modified melamine coating for household appliances with a dry film thickness of 10-20μm is obtained.

[0119] The substrate described in the present invention is a conventional substrate or a pre-coated substrate.

[0120] The conventional substrate in the present invention is a plastic substrate or a metal substrate.

[0121] The plastic substrate in the present invention can be PC, PP, PS, ABS, etc., preferably PC substrate.

[0122] The metal substrate in the present invention can be tinplate, phosphated steel plate, sandblasted steel plate, etc.

[0123] The following embodiments of the present invention also provide a use of a modified melamine coating for household appliances, which is only used as the outermost coating.

[0124] In order to further understand the present invention, a modified melamine coating for household appliances provided by the present invention is described in detail below in conjunction with embodiments, and the protection scope of the present invention is not limited by the following embodiments.

[0125] Example 1

[0126] A method for preparing a modified melamine monomer comprises the following steps:

[0127] (1) Nano-aluminum hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 70° C. while stirring; silane coupling agent KH570 diluted with anhydrous ethanol A is added, and stirring is continued for 15 hours, and then cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 6 hours, and ground to obtain an intermediate product I;

[0128] The dosage ratio of the nano aluminum hydroxide, deionized water A, and anhydrous ethanol B is 50g:200mL:800mL;

[0129] The dosage of the nano aluminum hydroxide and the silane coupling agent KH570 is 100g:4.0g;

[0130] The volume ratio of the silane coupling agent KH570 to anhydrous ethanol A is 1:1;

[0131] Its infrared data are as follows: 3638cm -1 :-OH weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- exists; 618cm -1 、771cm -1 :Al-O exists.

[0132] (2) Add the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heat to 30°C and continue stirring, and slowly add to a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 40°C. After the addition is completed within 2 hours, heat to 50°C and continue stirring for 4 hours, then distill under reduced pressure and dry under vacuum at 80°C for 4 hours to obtain the intermediate product II;

[0133] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0134] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0135] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0136] The amount of triethylamine A is 2.0wt% of melamine;

[0137] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- exists; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- does not exist; 618cm -1 、771cm -1 :Al-O exists; 1398cm -1 、1462cm -1 、1558cm-1 、1593cm -1 : Triazine ring exists.

[0138] (3) Allyl glycidyl ether and N,N-dimethylformamide C were added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 40°C. After the addition was completed within 2 hours, stirring was continued for 4 hours, and then the mixture was distilled under reduced pressure and dried under vacuum at 80°C for 4 hours to obtain intermediate product III;

[0139] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0140] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0141] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1;

[0142] The amount of triethylamine B is 2.0wt% of allyl glycidyl ether;

[0143] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group does not exist.

[0144] (4) adding the intermediate product III and DOPO to 1,4-dioxane, stirring, then adding AIBN, and placing in an oil bath at 80° C. for 8 h. After the reaction is completed, filtering, vacuum distillation, and vacuum drying are performed to obtain the intermediate product IV;

[0145] The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0146] The usage ratio of DOPO and 1,4-dioxane is 10 g:500 mL;

[0147] The amount of AIBN is 1.0wt% of DOPO;

[0148] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH-; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- does not exist; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-exists.

[0149] (5) adding isocyanoethyl methacrylate, p-hydroxyanisole, and intermediate product IV to N,N-dimethylformamide E, stirring under magnetic stirring at room temperature for 1 hour, and after the reaction is completed, performing reduced pressure distillation and vacuum drying at 60° C. for 8 hours to obtain intermediate product V;

[0150] The isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1;

[0151] The dosage ratio of isocyanoethyl methacrylate and N,N-dimethylformamide F is 10g:600mL;

[0152] The dosage of the p-hydroxyanisole is 1.0wt% of isocyanoethyl methacrylate;

[0153] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm-1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists.

[0154] (6) Anhydrous copper acetate was dissolved in deionized water B, and the intermediate product V was added to N,N-dimethylformamide F. After blending and ultrasonication for 0.5 h, the mixture was transferred to a reactor. The reactor was completely sealed and stirred at room temperature for 12 h. The concentrate was distilled under reduced pressure, and the concentrate was washed three times with deionized water C and dried at 60° C. for 12 h to obtain the target product.

[0155] The usage ratio of anhydrous copper acetate, deionized water B, intermediate product V, and N,N-dimethylformamide F is 15 g: 50 mL: 100 g: 800 mL;

[0156] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists; 618cm -1 、771cm -1:Al-O exists; 419cm -1 :Cu-N exists.

[0157] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0158] Sartomer CN2551 30 parts;

[0159] 25 parts of modified melamine monomer;

[0160] TPGDA 10 copies;

[0161] TMPTA 5 parts;

[0162] Photoinitiator 184 3 parts;

[0163] Leveling agent 401LS 0.3 parts;

[0164] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0165] The total amount of the above components is 100 parts.

[0166] A method for preparing a modified melamine coating for household appliances comprises the following steps:

[0167] Protect from light, keep humidity ≤60%, mix the leveling agent and organic solvent evenly, add polyester acrylate prepolymer, UV monomer diluent and modified melamine monomer to the mixed solvent in sequence, continue to stir evenly, add photoinitiator, stir evenly, filter with filter cloth with a pore size of 1 μm, and obtain modified melamine coating for home appliances.

[0168] A method for preparing a modified melamine coating for household appliances comprises the following steps:

[0169] Adjust the modified melamine paint for home appliances to the construction viscosity, spray it evenly on the PC substrate, heat it at 80℃ for 120s, and irradiate the coating layer with UV at an irradiation energy of 600mJ / cm 2 , irradiation time 45s, that is, a modified melamine coating for household appliances with a dry film thickness of 20μm was obtained.

[0170] Example 2

[0171] A method for preparing a modified melamine monomer comprises the following steps:

[0172] (1) Nano-aluminum hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 80° C. while stirring; silane coupling agent KH560 diluted with anhydrous ethanol A is added, and stirring is continued for 10 hours, and then cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 8 hours, and ground to obtain an intermediate product I;

[0173] The dosage ratio of the nano aluminum hydroxide, deionized water A, and anhydrous ethanol B is 50g:200mL:800mL;

[0174] The dosage of the nano aluminum hydroxide and the silane coupling agent KH560 is 100g:3.0g;

[0175] The volume ratio of the silane coupling agent KH560 to anhydrous ethanol A is 1:1;

[0176] Its infrared data are as follows: 3638cm -1 :-OH weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group exists; 618cm -1 、771cm -1 :Al-O exists.

[0177] (2) Add the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heat to 40°C and continue stirring, and slowly add to a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 40°C. After the addition is completed within 2 hours, heat to 60°C and continue stirring for 8 hours, then distill under reduced pressure and dry under vacuum at 80°C for 4 hours to obtain the intermediate product II;

[0178] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0179] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0180] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0181] The amount of triethylamine A is 1.0wt% of melamine;

[0182] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1 :-NH- exists; 1109cm -1 、801cm -1 :-Si-O- exists; 618cm -1 、771cm -1 :Al-O exists; 1262cm -1 、911cm -1、810cm -1 : Epoxy group does not exist; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists.

[0183] (3) Allyl glycidyl ether and N,N-dimethylformamide C were added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 50°C. After the addition was completed within 2 hours, stirring was continued for 2 hours, and then the mixture was distilled under reduced pressure and dried under vacuum at 80°C for 4 hours to obtain intermediate product III;

[0184] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0185] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0186] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1;

[0187] The amount of triethylamine B is 1.0wt% of allyl glycidyl ether;

[0188] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group does not exist.

[0189] (4) adding the intermediate product III and DOPO to 1,4-dioxane, stirring, then adding AIBN, and placing in an oil bath at 70° C. for 12 h. After the reaction is completed, filtering, vacuum distillation, and vacuum drying are performed to obtain the intermediate product IV;

[0190] The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0191] The usage ratio of DOPO and 1,4-dioxane is 10 g:500 mL;

[0192] The amount of AIBN is 1.5wt% of DOPO;

[0193] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH-; 1109cm -1 、801cm -1 :-Si-O- exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- does not exist; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-exists.

[0194] (5) adding isocyanoethyl methacrylate, p-hydroxyanisole, and intermediate product IV to N,N-dimethylformamide E, and stirring under magnetic stirring for 2 h at room temperature. After the reaction is completed, distillation under reduced pressure and vacuum drying at 60° C. for 8 h are performed to obtain intermediate product V;

[0195] The isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1;

[0196] The dosage ratio of isocyanoethyl methacrylate and N,N-dimethylformamide F is 10g:600mL;

[0197] The dosage of the p-hydroxyanisole is 1.5wt% of isocyanoethyl methacrylate;

[0198] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm-1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists.

[0199] (6) Anhydrous copper acetate was dissolved in deionized water B, and the intermediate product V was added to N,N-dimethylformamide F. After blending and ultrasonication for 0.5 h, the mixture was transferred to a reactor. The reactor was completely sealed and stirred at room temperature for 12 h. The concentrate was distilled under reduced pressure, and the concentrate was washed three times with deionized water C and dried at 60° C. for 12 h to obtain the target product.

[0200] The usage ratio of the anhydrous copper acetate, deionized water B, intermediate product V, and N,N-dimethylformamide F is 20 g: 50 mL: 100 g: 800 mL;

[0201] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists; 618cm -1、771cm -1 :Al-O exists; 419cm -1 :Cu-N exists.

[0202] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0203] Sartomer CN2551 30 parts;

[0204] 25 parts of modified melamine monomer;

[0205] TPGDA 10 copies;

[0206] TMPTA 5 parts;

[0207] Photoinitiator TPO 2 parts;

[0208] Leveling agent 401LS 0.3 parts;

[0209] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0210] The total amount of the above components is 100 parts.

[0211] Example 3

[0212] A method for preparing a modified melamine monomer comprises the following steps:

[0213] (1) Nano-aluminum hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 60° C. while stirring; silane coupling agent KH570 diluted with anhydrous ethanol A is added, and stirring is continued for 20 hours, and then cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 8 hours, and ground to obtain an intermediate product I;

[0214] The dosage ratio of the nano aluminum hydroxide, deionized water A, and anhydrous ethanol B is 50g:200mL:800mL;

[0215] The dosage of the nano aluminum hydroxide and the silane coupling agent KH570 is 100g:5.0g;

[0216] The volume ratio of the silane coupling agent KH570 to anhydrous ethanol A is 1:1;

[0217] Its infrared data are as follows: 3638cm -1 :-OH weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1:-C=C- exists; 618cm -1 、771cm -1 :Al-O exists.

[0218] (2) Add the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heat to 35°C and continue stirring, and slowly add to a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 45°C. After the addition is completed within 2 hours, heat to 55°C and continue stirring for 2 hours, then distill under reduced pressure and dry under vacuum at 80°C for 4 hours to obtain the intermediate product II;

[0219] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0220] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0221] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0222] The amount of triethylamine A is 1.5wt% of melamine;

[0223] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- exists; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- does not exist; 618cm -1 、771cm -1 :Al-O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists.

[0224] (3) Allyl glycidyl ether and N,N-dimethylformamide C were added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 45°C. After the addition was completed within 2 hours, stirring was continued for 2 hours, and then vacuum distillation was performed, and vacuum drying was performed at 80°C for 4 hours to obtain intermediate product III;

[0225] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0226] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0227] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1;

[0228] The amount of triethylamine B used is 1.5wt% of allyl glycidyl ether;

[0229] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group does not exist.

[0230] (4) adding the intermediate product III and DOPO to 1,4-dioxane, stirring, then adding AIBN, and placing in an oil bath at 75°C for 10 hours. After the reaction is completed, filtering, vacuum distillation, and vacuum drying are performed to obtain the intermediate product IV;

[0231] The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0232] The usage ratio of DOPO and 1,4-dioxane is 10 g:500 mL;

[0233] The amount of AIBN is 1.5wt% of DOPO;

[0234] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH-; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm-1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- does not exist; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-exists.

[0235] (5) adding isocyanoethyl methacrylate, p-hydroxyanisole, and intermediate product IV to N,N-dimethylformamide E, stirring under magnetic stirring at room temperature for 1 hour, and after the reaction is completed, performing reduced pressure distillation and vacuum drying at 60° C. for 8 hours to obtain intermediate product V;

[0236] The isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1;

[0237] The dosage ratio of isocyanoethyl methacrylate and N,N-dimethylformamide F is 10g:600mL;

[0238] The dosage of the p-hydroxyanisole is 1.5wt% of isocyanoethyl methacrylate;

[0239] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1:PO-existence; 1604cm -1 、811cm -1 :-C=C- exists.

[0240] (6) Anhydrous copper acetate was dissolved in deionized water B, and the intermediate product V was added to N,N-dimethylformamide F. After blending and ultrasonication for 0.5 h, the mixture was transferred to a reactor. The reactor was completely sealed and stirred at room temperature for 12 h. The concentrate was distilled under reduced pressure, and the concentrate was washed three times with deionized water C and dried at 60° C. for 12 h to obtain the target product.

[0241] The usage ratio of the anhydrous copper acetate, deionized water B, intermediate product V, and N,N-dimethylformamide F is 10 g: 50 mL: 100 g: 800 mL;

[0242] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists; 618cm -1 、771cm -1 :Al-O exists; 419cm -1 :Cu-N exists.

[0243] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0244] Sartomer CN2551 30 parts;

[0245] 25 parts of modified melamine monomer;

[0246] TPGDA 10 copies;

[0247] TMPTA 5 parts;

[0248] Photoinitiator BP 2 parts;

[0249] Photoinitiator 1173 3 parts;

[0250] Leveling agent 401LS 0.3 parts;

[0251] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0252] The total amount of the above components is 100 parts.

[0253] Example 4

[0254] A method for preparing a modified melamine monomer comprises the following steps:

[0255] (1) Nano magnesium hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 70° C. while stirring; silane coupling agent KH570 diluted with anhydrous ethanol A is added, and stirring is continued for 15 hours, and then cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 8 hours, and ground to obtain an intermediate product I;

[0256] The dosage ratio of the nano magnesium hydroxide, deionized water A, and anhydrous ethanol B is 50g:200mL:800mL;

[0257] The dosage of the nano magnesium hydroxide and the silane coupling agent KH570 is 100g:4.0g;

[0258] The volume ratio of the silane coupling agent KH570 to anhydrous ethanol A is 1:1;

[0259] Its infrared data are as follows: 3638cm -1 :-OH weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- exists; 597cm -1 : Mg-O exists.

[0260] (2) Add the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heat to 30°C and continue stirring, and slowly add to a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 40°C. After the addition is completed within 2 hours, heat to 50°C and continue stirring for 4 hours, then distill under reduced pressure and dry under vacuum at 80°C for 4 hours to obtain the intermediate product II;

[0261] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0262] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0263] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0264] The amount of triethylamine A is 2.0wt% of melamine;

[0265] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- exists; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- does not exist; 597cm -1 :Mg-O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists.

[0266] (3) Allyl glycidyl ether and N,N-dimethylformamide C were added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 40°C. After the addition was completed within 2 hours, stirring was continued for 4 hours, and then the mixture was distilled under reduced pressure and dried under vacuum at 80°C for 4 hours to obtain intermediate product III;

[0267] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0268] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0269] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1;

[0270] The amount of triethylamine B is 2.0wt% of allyl glycidyl ether;

[0271] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1:-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 597cm -1 :Mg-O exists; 1621cm -1 :-C=C- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group does not exist.

[0272] (4) adding the intermediate product III and DOPO to 1,4-dioxane, stirring, then adding AIBN, and placing in an oil bath at 70° C. for 12 h. After the reaction is completed, filtering, vacuum distillation, and vacuum drying are performed to obtain the intermediate product IV;

[0273] The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0274] The usage ratio of DOPO and 1,4-dioxane is 10 g:500 mL;

[0275] The amount of AIBN is 1.0wt% of DOPO;

[0276] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH-; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 597cm -1 :Mg-O exists; 1621cm -1 :-C=C- does not exist; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-exists.

[0277] (5) adding isocyanoethyl methacrylate, p-hydroxyanisole, and intermediate product IV to N,N-dimethylformamide E, and stirring under magnetic stirring for 2 h at room temperature. After the reaction is completed, distillation under reduced pressure and vacuum drying at 60° C. for 8 h are performed to obtain intermediate product V;

[0278] The isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1;

[0279] The dosage ratio of isocyanoethyl methacrylate and N,N-dimethylformamide F is 10g:600mL;

[0280] The dosage of the p-hydroxyanisole is 1.0wt% of isocyanoethyl methacrylate;

[0281] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 597cm -1 :Mg-O exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists.

[0282] (6) Anhydrous copper acetate was dissolved in deionized water B, and the intermediate product V was added to N,N-dimethylformamide F. After blending and ultrasonication for 0.5 h, the mixture was transferred to a reactor. The reactor was completely sealed and stirred at room temperature for 12 h. The concentrate was distilled under reduced pressure, and the concentrate was washed three times with deionized water C and dried at 60° C. for 12 h to obtain the target product.

[0283] The usage ratio of anhydrous copper acetate, deionized water B, intermediate product V, and N,N-dimethylformamide F is 15 g: 50 mL: 100 g: 800 mL;

[0284] Its infrared data are as follows: 3638cm-1 :-OH exists; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1671cm -1 、1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-existence; 1604cm -1 、811cm -1 :-C=C- exists; 597cm -1 :Mg-O exists; 419cm -1 :Cu-N exists.

[0285] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0286] Sartomer CN2551 30 parts;

[0287] 25 parts of modified melamine monomer;

[0288] TPGDA 10 copies;

[0289] TMPTA 5 parts;

[0290] Photoinitiator 1173 3 parts;

[0291] Leveling agent 401LS 0.3 parts;

[0292] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0293] The total amount of the above components is 100 parts.

[0294] Example 5

[0295] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0296] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0297] Sartomer CN2551 35 copies;

[0298] 25 parts of modified melamine monomer;

[0299] IBOMA 2 copies;

[0300] DPGDA 5 parts;

[0301] EO-TMPTA 8 parts;

[0302] Photoinitiator 184 3 parts;

[0303] Leveling agent 401LS 0.4 parts;

[0304] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0305] The total amount of the above components is 100 parts.

[0306] Example 6

[0307] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0308] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0309] Sartomer CN2551 40 parts;

[0310] 25 parts of modified melamine monomer;

[0311] THFA 5 parts;

[0312] HDDA 5 copies;

[0313] PO-TMPTA 5 parts;

[0314] Photoinitiator 184 3 parts;

[0315] Leveling agent 401LS 0.4 parts;

[0316] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0317] The total amount of the above components is 100 parts.

[0318] Example 7

[0319] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0320] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0321] Sartomer CN2551 25 parts;

[0322] 25 parts of modified melamine monomer;

[0323] 4 copies of PDDA;

[0324] PO-TMPTA 4 parts;

[0325] 2 parts of dipentaerythritol hexaacrylate;

[0326] Photoinitiator 184 3 parts;

[0327] Leveling agent 401LS 0.3 parts;

[0328] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0329] The total amount of the above components is 100 parts.

[0330] Example 8

[0331] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0332] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0333] Sartomer CN2551 20 parts;

[0334] 25 parts of modified melamine monomer;

[0335] NPGDA 4 copies;

[0336] PETTA 2 parts;

[0337] 2 parts of dipentaerythritol hexaacrylate;

[0338] Photoinitiator 184 3 parts;

[0339] Leveling agent 401LS 0.1;

[0340] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0341] The total amount of the above components is 100 parts.

[0342] Example 9

[0343] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0344] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0345] Sartomer CN2551 30 parts;

[0346] 20 parts of modified melamine monomer;

[0347] TPGDA 10 copies;

[0348] TMPTA 5 parts;

[0349] Photoinitiator 184 3 parts;

[0350] Leveling agent 401LS 0.3 parts;

[0351] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0352] The total amount of the above components is 100 parts.

[0353] Example 10

[0354] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0355] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0356] Sartomer CN2551 30 parts;

[0357] 15 parts of modified melamine monomer;

[0358] TPGDA 10 copies;

[0359] TMPTA 5 parts;

[0360] Photoinitiator 184 3 parts;

[0361] Leveling agent 401LS 0.3 parts;

[0362] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0363] The total amount of the above components is 100 parts.

[0364] Embodiment 11

[0365] The preparation method of a modified melamine monomer is the same as that in specific embodiment 1.

[0366] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0367] Sartomer CN2551 30 parts;

[0368] 30 parts of modified melamine monomer;

[0369] TPGDA 10 copies;

[0370] TMPTA 5 parts;

[0371] Photoinitiator 184 3 parts;

[0372] Leveling agent 401LS 0.3 parts;

[0373] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0374] The total amount of the above components is 100 parts.

[0375] Specific Example 1 of the method for preparing a modified melamine coating for household appliances described in the above Examples 2-11.

[0376] Specific Example 1 of the method for preparing a modified melamine coating for household appliances described in the above Examples 2-11.

[0377] The following comparative examples are compared with specific embodiment 1:

[0378] Comparative Example 1

[0379] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0380] Sartomer CN2551 30 parts;

[0381] TPGDA 10 copies;

[0382] TMPTA 5 parts;

[0383] Photoinitiator 184 3 parts;

[0384] Leveling agent 401LS 0.3 parts;

[0385] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0386] The total amount of the above components is 100 parts.

[0387] Comparative Example 2

[0388] A method for preparing a modified melamine monomer comprises the following steps:

[0389] Isocyanoethyl methacrylate, p-hydroxyanisole and melamine were added to N,N-dimethylformamide E, and magnetic stirring was performed at 60°C for 6 hours. After the reaction was completed, the reaction was distilled under reduced pressure and vacuum dried at 60°C for 8 hours to obtain an intermediate product V.

[0390] The usage ratio of isocyanoethyl methacrylate and melamine is 3.6 mol:1 mol;

[0391] The dosage ratio of isocyanoethyl methacrylate and N,N-dimethylformamide F is 10g:600mL;

[0392] The dosage of the p-hydroxyanisole is 1.0wt% of isocyanoethyl methacrylate;

[0393] Its infrared data is as follows: 3326cm -1 :-NH- weakened; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 1604cm -1 、811cm -1 :-C=C- exists.

[0394] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0395] Sartomer CN2551 30 parts;

[0396] 25 parts of modified melamine monomer;

[0397] TPGDA 10 copies;

[0398] TMPTA 5 parts;

[0399] Photoinitiator 184 3 parts;

[0400] Leveling agent 401LS 0.3 parts;

[0401] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0402] The total amount of the above components is 100 parts.

[0403] Comparative Example 3

[0404] A method for preparing a modified melamine monomer comprises the following steps:

[0405] (1) Nano-aluminum hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 70° C. while stirring; silane coupling agent KH570 diluted with anhydrous ethanol A is added, and stirring is continued for 15 hours, and then cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 6 hours, and ground to obtain an intermediate product I;

[0406] The dosage ratio of the nano aluminum hydroxide, deionized water A, and anhydrous ethanol B is 50g:200mL:800mL;

[0407] The dosage of the nano aluminum hydroxide and the silane coupling agent KH570 is 100g:4.0g;

[0408] The volume ratio of the silane coupling agent KH570 to anhydrous ethanol A is 1:1;

[0409] Its infrared data are as follows: 3638cm -1 :-OH weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- exists; 618cm -1 、771cm -1 :Al-O exists.

[0410] (2) Add the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heat to 30°C and continue stirring, and slowly add to a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 40°C. After the addition is completed within 2 hours, heat to 50°C and continue stirring for 4 hours, then distill under reduced pressure and dry under vacuum at 80°C for 4 hours to obtain the intermediate product II;

[0411] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0412] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0413] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0414] The amount of triethylamine A is 2.0wt% of melamine;

[0415] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- exists; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- does not exist; 618cm -1 、771cm -1 :Al-O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists.

[0416] (3) Allyl glycidyl ether and N,N-dimethylformamide C were added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 40°C. After the addition was completed within 2 hours, stirring was continued for 4 hours, and then the mixture was distilled under reduced pressure and dried under vacuum at 80°C for 4 hours to obtain the target product;

[0417] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0418] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0419] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:2;

[0420] The amount of triethylamine B is 2.0wt% of allyl glycidyl ether;

[0421] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group does not exist.

[0422] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0423] Sartomer CN2551 30 parts;

[0424] 25 parts of modified melamine monomer;

[0425] TPGDA 10 copies;

[0426] TMPTA 5 parts;

[0427] Photoinitiator 184 3 parts;

[0428] Leveling agent 401LS 0.3 parts;

[0429] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0430] Comparative Example 4

[0431] A method for preparing a modified melamine monomer comprises the following steps:

[0432] (1) Nano-aluminum hydroxide and deionized water A are prepared into a slurry of a certain concentration, and heated to 70° C. while stirring; silane coupling agent KH570 diluted with anhydrous ethanol A is added, and stirring is continued for 15 hours, and then cooled, filtered, washed with anhydrous ethanol B, filtered again, placed in an oven at 80° C. and vacuum dried for 6 hours, and ground to obtain an intermediate product I;

[0433] The dosage ratio of the nano aluminum hydroxide, deionized water A, and anhydrous ethanol B is 50g:200mL:800mL;

[0434] The dosage of the nano aluminum hydroxide and the silane coupling agent KH570 is 100g:4.0g;

[0435] The volume ratio of the silane coupling agent KH570 to anhydrous ethanol A is 1:1;

[0436] Its infrared data are as follows: 3638cm -1 :-OH weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- exists; 618cm -1 、771cm -1 :Al-O exists.

[0437] (2) Add the intermediate product I and N,N-dimethylformamide A into a peristaltic pump, heat to 30°C and continue stirring, and slowly add to a reaction kettle containing melamine, triethylamine A and N,N-dimethylformamide B at a temperature of 40°C. After the addition is completed within 2 hours, heat to 50°C and continue stirring for 4 hours, then distill under reduced pressure and dry under vacuum at 80°C for 4 hours to obtain the intermediate product II;

[0438] The usage ratio of the intermediate product I and N,N-dimethylformamide A is 50 g:200 mL;

[0439] The dosage ratio of melamine and N,N-dimethylformamide B is 10g:200mL;

[0440] The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1;

[0441] The amount of triethylamine A is 2.0wt% of melamine;

[0442] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH- exists; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1604cm -1 、811cm -1 :-C=C- does not exist; 618cm -1 、771cm -1 :Al-O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists.

[0443] (3) Allyl glycidyl ether and N,N-dimethylformamide C were added to a constant pressure dropping funnel, and slowly added dropwise to a reaction kettle containing intermediate product II, triethylamine B, and N,N-dimethylformamide D at a temperature of 40°C. After the addition was completed within 2 hours, stirring was continued for 4 hours, and then the mixture was distilled under reduced pressure and dried under vacuum at 80°C for 4 hours to obtain intermediate product III;

[0444] The dosage ratio of allyl glycidyl ether and N,N-dimethylformamide C is 10g:200mL;

[0445] The usage ratio of the intermediate product II and N,N-dimethylformamide D is 50 g:400 mL;

[0446] The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:2;

[0447] The amount of triethylamine B is 2.0wt% of allyl glycidyl ether;

[0448] Its infrared data are as follows: 3638cm -1 :-OH exists and is enhanced; 3326cm -1 :-NH- weakened; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm-1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- exists; 1262cm -1 、911cm -1 、810cm -1 : Epoxy group does not exist.

[0449] (4) Add the intermediate III and DOPO to 1,4-dioxane, stir, then add AIBN, and place in an oil bath at 80°C for 8 hours. After the reaction is completed, filter, distill under reduced pressure, and dry in vacuum to obtain the target product;

[0450] The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1;

[0451] The usage ratio of DOPO and 1,4-dioxane is 10 g:500 mL;

[0452] The amount of AIBN is 1.0wt% of DOPO;

[0453] Its infrared data are as follows: 3638cm -1 :-OH exists; 3326cm -1 :-NH-; 1109cm -1 、801cm -1 :-Si-O- exists; 1735cm -1 :-C=O exists; 1398cm -1 、1462cm -1 、1558cm -1 、1593cm -1 : Triazine ring exists; 618cm -1 、771cm -1 :Al-O exists; 1621cm -1 :-C=C- exists and decreases; 3064cm -1 : benzene ring -CH exists; 2920cm -1 :CH exists in P-CH-; 1302cm -1 :P=O exists; 1190cm -1 :PO-exists.

[0454] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0455] Sartomer CN2551 30 parts;

[0456] 25 parts of modified melamine monomer;

[0457] TPGDA 10 copies;

[0458] TMPTA 5 parts;

[0459] Photoinitiator 184 3 parts;

[0460] Leveling agent 401LS 0.3 parts;

[0461] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0462] The total amount of the above components is 100 parts.

[0463] Comparative Example 5

[0464] A method for preparing a modified melamine monomer is the same as the intermediate product V in specific embodiment 1.

[0465] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0466] Sartomer CN2551 30 parts;

[0467] 25 parts of modified melamine monomer;

[0468] TPGDA 10 copies;

[0469] TMPTA 5 parts;

[0470] Photoinitiator 184 3 parts;

[0471] Leveling agent 401LS 0.3 parts;

[0472] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0473] The total amount of the above components is 100 parts.

[0474] Comparative Example 6

[0475] A method for preparing a modified melamine monomer is the same as that in specific embodiment 1, except that the copper salt is replaced by zinc nitrate hexahydrate.

[0476] A modified melamine coating for household appliances comprises the following raw materials in parts by weight:

[0477] Sartomer CN2551 30 parts;

[0478] 25 parts of modified melamine monomer;

[0479] TPGDA 10 copies;

[0480] TMPTA 5 parts;

[0481] Photoinitiator 184 3 parts;

[0482] Leveling agent 401LS 0.3 parts;

[0483] The balance of organic solvent (EAc and PMA mixed in a mass ratio of 2:1);

[0484] The total amount of the above components is 100 parts.

[0485] Specific Example 1 of the method for preparing a modified melamine coating for household appliances described in the above comparative examples 1-6.

[0486] Specific Example 1 of the method for preparing a modified melamine coating for household appliances described in the above comparative examples 1-6.

[0487] The physical properties of the modified melamine coatings for household appliances prepared in Examples 1-11 of the present invention and Comparative Examples 1-6 were measured respectively, and the results are shown in Table 1.

[0488] Table 1 Physical test performance of each embodiment

[0489]

[0490] First, compared with comparative examples 1-6, the modified melamine coating for household appliances of the present invention has excellent antistatic, flame retardant and antibacterial properties, and also has excellent physical properties.

[0491] Second, it can be observed from Example 1 and Comparative Examples 1-2 that the modified melamine monomer of the present invention has multifunctionality, such as antibacterial property, antistatic property and flame retardancy; it can be observed from Example 1 and Comparative Example 3 that the hydroxide has certain antistatic property in addition to flame retardancy; it can be observed from Example 1 and Comparative Examples 4-5 that melamine has excellent flame retardancy and antistatic property after modification with nano hydroxide and DOPO; it can be observed from Example 1 and Comparative Example 6 that copper salt has excellent antibacterial property and also acts as a cross-linking center to improve mechanical property; it connects electron transmission channels in series to form a conductive network and improve antistatic effect; in addition, it also has a positive effect on coating appearance.

[0492] In summary, the modified melamine monomer has the carbon source, acid source, and gas source elements of the intumescent flame retardant, and has excellent flame retardant effect; at the same time, the flame retardant effect is better when compounded with the nano hydroxide flame retardant. In addition, copper ions have excellent antibacterial properties; and when combined with N, they form an electronic conductive network, which has excellent antistatic properties. The prepared coating also has excellent mechanical properties. It can meet the use in the field of household appliances.

[0493] The test method is as follows:

[0494] (1) Appearance: Visual inspection.

[0495] (2) Hardness: Tested according to the method described in GB / T 6739-2022, using a Mitsubishi pencil and a 750g weight.

[0496] (3) Abrasion resistance: Tested according to the method described in HG / T 4303-2012. Test conditions: 750g weight, 0000# steel wool.

[0497] (4) Adhesion: Adhesion test was performed according to the method described in ASTM D3359-17.

[0498] (5) Surface resistivity: Surface resistivity test shall be carried out according to the method described in GB / T 1410-2006.

[0499] (6) Antibacterial activity: The test was conducted according to the method described in GB / T 21866-2008. The bacterial species was Escherichia coli.

[0500] (7) Flame retardancy: tested according to the method described in GB / T 12441-2018.

[0501] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A modified melamine coating for household appliances, characterized in that: The invention comprises the following raw materials in parts by weight: 20-40 parts of polyester acrylate prepolymer; 15-30 parts of modified melamine monomer; 8-15 parts of UV monomer diluent; 2-5 parts of photoinitiator; Leveling agent 0.1-0.4 parts; Residue of organic solvent; The total amount of the above components is 100 parts; The preparation method of the modified melamine monomer comprises the following steps: (1) The nano hydroxide and the silane coupling agent are mixed to undergo a hydrolysis coupling reaction to prepare an intermediate product I; (2) The intermediate product I is subjected to a coupling reaction with melamine in the presence of a catalyst, triethylamine A, to prepare the intermediate product II; (3) subjecting the intermediate product II to a ring-opening reaction with allyl glycidyl ether in the presence of a catalyst, triethylamine B, to prepare an intermediate product III; (4) reacting the intermediate product III with DOPO under the initiator AIBN to prepare the intermediate product IV; (5) subjecting the intermediate product IV to a ring-opening reaction with isocyanoethyl methacrylate in the presence of a polymerization inhibitor, p-hydroxyanisole, to prepare an intermediate product V; (6) The intermediate product V is mixed with a copper salt for coordination reaction to obtain a modified melamine monomer.

2. The modified melamine coating for household appliances according to claim 1, characterized in that: The dosage of the nano hydroxide and the silane coupling agent is 100g: 3.0-5.0g; The intermediate product I and melamine are added in a molar ratio of silane coupling agent to melamine of 1:1; and The amount of triethylamine A used is 1.0-2.0 wt % of melamine.

3. The modified melamine coating for household appliances according to claim 1, characterized in that: The intermediate product II and allyl glycidyl ether are added in a molar ratio of melamine to allyl glycidyl ether of 1:1; The amount of triethylamine B used is 1.0-2.0 wt % of allyl glycidyl ether.

4. The modified melamine coating for household appliances according to claim 1, characterized in that: The intermediate product III and DOPO are added at a molar ratio of melamine to DOPO of 1:1; and The amount of AIBN used is 1.0-1.5 wt % of DOPO.

5. The modified melamine coating for household appliances according to claim 1, characterized in that: The isocyanoethyl methacrylate and the intermediate product IV are added at a molar ratio of isocyanoethyl methacrylate to melamine of 1.2:1; The amount of p-hydroxyanisole is 1.0-1.5wt% of isocyanoethyl methacrylate; and The usage ratio of the copper salt and the intermediate product V is 10-15g:100g.

6. The modified melamine coating for household appliances according to claim 1, characterized in that: The UV monomer diluent is any combination of monofunctional, difunctional, trifunctional, tetrafunctional or hexafunctional.

7. A method for preparing a modified melamine coating for household appliances according to any one of claims 1 to 6, characterized in that: The steps include: After the leveling agent and the organic solvent are evenly mixed, polyester acrylate prepolymer, UV monomer diluent, and modified melamine monomer are added to the mixed solvent in sequence, and after continuing to stir evenly, a photoinitiator is added, stirred evenly, and filtered with a filter cloth with a pore size of 1 μm to obtain a modified melamine coating for home appliances.

8. The method for preparing a modified melamine coating for household appliances according to claim 7, characterized in that: The steps include: The modified melamine coating for household appliances is uniformly coated on a substrate, the solvent is removed by heating, and the coating layer is subjected to UV irradiation to obtain a modified melamine coating for household appliances with a dry film thickness of 10-20 μm.

9. The use of a modified melamine coating for household appliances according to claim 1, characterized in that: Applied as the outermost coating.

Images