Flame-retardant anti-dazzle coating, flame-retardant anti-dazzle coating, LED display module and display screen

Abstract

The invention belongs to the technical field of LED display screens, and particularly relates to a flame-retardant anti-dazzle coating, a flame-retardant anti-dazzle coating, an LED display module and a display screen. Compared with the prior art, the flame-retardant anti-dazzle coating provided by the invention comprises the internal diffusion particles and the phosphorus-based flame-retardant particles, the internal diffusion particles can homogenize light rays from the source and reduce color separation, and the phosphorus-based flame-retardant particles can be used as external diffusion particles to scatter surface light rays and fuzzy edges, so that the ink color difference of a substrate is improved; when the chip is used for COB surface packaging, COB packaging glue and a pasting film can be replaced, the process is simplified, and the cost is saved; moreover, the phosphorus-based flame-retardant particles also enable the coating to have flame retardancy, the coating is packaged and used for an LED substrate, so that an LED display module and a display screen have flame retardancy, can pass the standards of V-0 and 5VA of UL 94 and BS476-7Class 1, and can be applied indoors and indoors.

Description

Technical Field

[0001] The present invention belongs to the technical field of LED display screens, and in particular relates to a flame retardant anti-glare paint, a flame retardant anti-glare coating, an LED display module and a display screen. Background Art

[0002] COB (chip on board) is the mainstream solution for lowering the dot pitch of LED displays (<1mm) and the application of Mini / Micro LED chips (MLED). It has obvious advantages in high luminous efficiency and uniformity, compact design and high power density, heat dissipation performance, and cost-effectiveness.

[0003] However, due to the uneven surface treatment of the COB substrate, the surface reflectivity fluctuates greatly, resulting in visible ink color differences. The common solution is to apply a light black anti-glare functional film after the substrate is encapsulated to improve the ink color difference, which increases the process difficulty and cost. In addition, the glue used for COB encapsulation is usually epoxy or silicone polymers, which are not flame retardant. Therefore, it has a fire risk when used indoors. The functional film used to improve the ink color difference increases the risk of combustion. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a flame retardant anti-glare coating, a flame retardant anti-glare coating, an LED display module and a display screen. The flame retardant anti-glare coating can be used for COB surface packaging and has high flame retardancy while improving the ink color difference of the substrate.

[0005] The present invention provides a flame retardant anti-glare coating, comprising:

[0006]

[0007] The particle size of the internal diffusion particles is 1 to 5 μm;

[0008] The particle size of the phosphorus-based flame retardant particles is 1 to 10 μm.

[0009] Preferably, the main resin is selected from a thermosetting resin or a UV curing resin;

[0010] The thermosetting resin is selected from one or more of epoxy resin, silicone resin, acrylic resin and saturated polyester resin;

[0011] The UV curable resin is selected from one or more of epoxy acrylic resin, silicone acrylic resin, polyester acrylic resin and alicyclic epoxy resin;

[0012] When the main resin is a thermosetting resin, the reactive diluent is selected from one or more of butyl glycidyl ether, phenyl glycidyl ether, ethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether and glycerol triglycidyl ether;

[0013] When the main resin is a UV curing resin, the reactive diluent is selected from one or more of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3-oxetane, 4-vinyl-1-cyclohexene-1,2-epoxy, 1-methyl-1,2-epoxycyclohexane, glycidyl acrylate, methacrylate oxetane, 3-ethyl-3-oxetanemethanol, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and (3,4-epoxycyclohexyl)methyl acrylate.

[0014] Preferably, the main resin is an epoxy resin; the molecular weight of the epoxy resin is 300 to 700 g / mol; and / or the epoxy equivalent weight of the epoxy resin is 180 to 250 g / eq.

[0015] Preferably, the main resin is selected from epoxy acrylic resin and / or alicyclic epoxy resin; the number of functional groups of the epoxy acrylic resin and alicyclic epoxy resin is independently an integer of 4 to 6.

[0016] Preferably, the mass ratio of the main resin to the reactive diluent is (4-5):1.

[0017] Preferably, the refractive index difference between the main resin and the internal diffusion particles is greater than or equal to 0.03.

[0018] Preferably, the internal diffusion particles are selected from organic diffusion particles and / or inorganic diffusion particles; the organic diffusion particles are selected from one or more of polystyrene microspheres, silica gel microspheres, acrylic copolymer microspheres and polymethyl methacrylate microspheres; the inorganic diffusion particles are selected from one or more of silicon dioxide, titanium dioxide and aluminum oxide;

[0019] And / or, the phosphorus-based flame retardant particles are selected from one or more of organic hypophosphites, phosphaphenanthrene flame retardants, phosphate flame retardants and phosphorus-nitrogen flame retardants;

[0020] The organic hypophosphite is selected from one or more of methylethylphosphinate aluminum, diethylphosphinate aluminum and methylcyclohexylphosphinate aluminum;

[0021] The phosphaphenanthrene flame retardant is selected from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and / or 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide;

[0022] The phosphate flame retardant is selected from one or more of triphenyl phosphate, pentaerythritol caged phosphate, bisphenol A bis(diphenyl) phosphate and resorcinol (diphenyl) phosphate;

[0023] The phosphorus-nitrogen flame retardant is selected from phosphazene and / or ammonium polyphosphate.

[0024] Preferably, the auxiliary agent includes one or more of a resin curing agent, a curing accelerator, a photoinitiator, a leveling agent, a silane coupling agent and a defoaming agent;

[0025] The resin curing agent includes one or more of an amine curing agent, an acid anhydride curing agent and a phenolic resin curing agent;

[0026] The curing accelerator includes one or more of tertiary amine accelerators, imidazole derivative accelerators, acetylacetone metal salt accelerators, metal carboxylate accelerators, peroxide accelerators and phosphide accelerators;

[0027] The photoinitiator includes an iodonium salt photoinitiator and / or a sulfonium salt photoinitiator;

[0028] The leveling agent includes one or more of an organic silicon leveling agent, an acrylic leveling agent and a fluorocarbon leveling agent;

[0029] The silane coupling agent includes one or more of a vinyl silane coupling agent, an epoxy silane coupling agent, an amino silane coupling agent, a urea silane coupling agent and a mercapto silane coupling agent;

[0030] The defoaming agent includes an organosilicon defoaming agent and / or a non-silicon defoaming agent.

[0031] The present invention also provides a flame retardant and anti-glare coating, which is formed by film-forming and curing the flame retardant and anti-glare coating.

[0032] The present invention also provides an LED display module, comprising a substrate, a plurality of LED light-emitting chips arranged on the substrate, and an anti-glare flame-retardant coating arranged between the plurality of LED light-emitting chips and on a surface away from the substrate; the anti-glare flame-retardant coating is formed by film-forming and curing the above-mentioned flame-retardant anti-glare coating.

[0033] The present invention also provides a display screen, comprising the above-mentioned LED display module.

[0034] The present invention provides a flame-retardant anti-glare coating, comprising: a main resin and 25 to 60 parts by weight of a reactive diluent; 4 to 6 parts by weight of internal diffusion particles; 20 to 55 parts by weight of phosphorus-based flame-retardant particles; and 16 to 26 parts by weight of an additive. The difference in refractive index between the main resin and the internal diffusion particles is greater than or equal to 0.03; the particle size of the internal diffusion particles is 1 to 5 μm; and the particle size of the phosphorus-based flame-retardant particles is 1 to 10 μm. Compared with the prior art, the flame-retardant and anti-glare coating provided by the present invention contains internal diffusion particles and phosphorus-based flame-retardant particles. The internal diffusion particles can evenly distribute light from the source and reduce color separation. The phosphorus-based flame-retardant particles can serve as external diffusion particles to scatter surface light and blur edges, thereby improving the ink color difference of the substrate. Using it for COB surface f packaging can replace COB packaging glue and film, simplifying the process and saving costs. Moreover, the phosphorus-based flame-retardant particles also make the coating flame-retardant. When the coating is encapsulated and used on LED substrates, the LED display modules and screens can be flame-retardant and can pass UL 94 V-0 and 5VA and BS476-7 Class 1 standards. It can be used indoors and outdoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the preparation process of the LED display module provided by the present invention;

[0036] Figure 2 This is a diagram showing the UL 94V-0 test results of the LED display module prepared in Example 1 of the present invention;

[0037] Figure 3 This is a BS476-7 test effect diagram of the LED display module prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] The present invention provides a flame-retardant anti-glare coating, comprising: a main resin and 25 to 60 parts by weight of a reactive diluent; 4 to 6 parts by weight of internal diffusion particles; 20 to 55 parts by weight of phosphorus-based flame-retardant particles; and 16 to 26 parts by weight of an auxiliary agent. The particle size of the internal diffusion particles is 1 to 5 μm; and the particle size of the phosphorus-based flame-retardant particles is 1 to 10 μm.

[0040] According to the present invention, optionally, the content of the main resin and the reactive diluent in the flame retardant anti-glare coating is 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight or a range between any two of the above values.

[0041] According to the present invention, the mass ratio of the main resin to the reactive diluent is preferably (4-5):1.

[0042] According to the present invention, the main resin may be a thermosetting resin or a UV curing resin.

[0043] The thermosetting resin is any thermosetting resin well known to those skilled in the art, and is not particularly limited thereto. The present invention includes but is not limited to one or more of epoxy resin, silicone resin, acrylic resin and saturated polyester resin. Considering the adhesion between the coating and the substrate, the thermosetting resin in the present invention is preferably epoxy resin. The molecular weight of the epoxy resin is preferably 300 to 700 g / mol. A molecular weight lower than this will reduce the crosslinking density, which may result in insufficient heat resistance and mechanical strength. A molecular weight higher than this will have poor miscibility with fillers, resulting in uneven components after molding, thereby affecting appearance and performance. Optionally, the molecular weight of the epoxy resin is 300 g / mol, 350 g / mol, 400 g / mol, 500 g / mol, 600 g / mol, 700 g / mol, 800 g / mol, 900 g / mol, 1000 g / mol, 1100 g / mol, 1200 g / mol, 1300 g / mol, 1400 g / mol, 1500 g / mol, 1600 g / mol, 1700 g / mol, 1800 g / mol, 1900 g / mol, 2000 g / mol, 2100 g / mol, 2200 g / mol, 2300 g / mol, 2400 g / mol, 2500 g / mol, 2600 g / mol, 2700 g / mol, 2800 g / mol, 2900 g / mol, 3000 g / mol, 3100 g / mol, 3100 g / mol, 3 g / mol, 450g / mol, 500g / mol, 550g / mol, 600g / mol, 650g / mol, 700g / mol or the range between any two of the above values; the epoxy equivalent of the epoxy resin is preferably 180-250g / eq; an epoxy equivalent lower than this may result in excessive crosslinking density and increased brittleness, while an epoxy equivalent higher than this may reduce heat resistance and chemical resistance; optionally, the epoxy equivalent of the epoxy resin is 180g / eq, 190g / eq, 200g / eq, 210g / eq, 220g / eq, 230g / eq, 240g / eq, 250g / eq or the range between any two of the above values.

[0044] The UV curable resin can be any UV curable resin well known to those skilled in the art without any particular limitation, and includes but is not limited to one or more of epoxy acrylic resin, silicone acrylic resin, polyester acrylic resin and alicyclic epoxy resin. Considering the adhesion to the substrate, the UV curable resin in the present invention is preferably epoxy acrylic resin and / or alicyclic epoxy resin. The number of functional groups of the epoxy acrylic resin and the alicyclic epoxy resin is preferably an integer of 4 to 6. Resins with a functionality lower than this value have insufficient crosslinking, while resins with a functionality higher than this value have increased brittleness. Optionally, the number of functional groups of the epoxy acrylic resin and the alicyclic epoxy resin is preferably 4, 5 or 6.

[0045] According to the present invention, the type of the reactive diluent can be selected according to the type of the main resin; when the main resin is a thermosetting resin, the reactive diluent can be any thermosetting reactive diluent well known to those skilled in the art, without any special restrictions, preferably including but not limited to one or more of butyl glycidyl ether, phenyl glycidyl ether, ethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether and glycerol triglycidyl ether; when the main resin is a UV curing resin, the reactive diluent is this The UV curing diluent well known to those skilled in the art can be used without special restrictions, and preferably includes but is not limited to one or more of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3-oxetane, 4-vinyl-1-cyclohexene-1,2-epoxy, 1-methyl-1,2-epoxycyclohexane, glycidyl acrylate, methacrylate oxetane, 3-ethyl-3-oxetanemethanol, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and (3,4-epoxycyclohexyl)methyl acrylate.

[0046] According to the present invention, optionally, the content of the internal diffusion particles in the flame retardant anti-glare coating is 4 parts by weight, 5 parts by weight, 6 parts by weight or a range between any two of the above values.

[0047] The coating formed by the flame-retardant anti-glare coating provided by the present invention can generate internal haze by the difference in refractive index between the internal diffusion particles and the main resin, thereby making the light more uniform; therefore, in the present invention, the refractive index difference between the main resin and the internal diffusion particles, that is, the absolute value of the difference, must be greater than or equal to 0.03; the refractive index of the main resin is preferably 1.5 to 1.55; the internal diffusion particles can be organic diffusion particles and / or inorganic diffusion particles, and the specific type can be selected according to the refractive index. The refractive index of the internal diffusion particles can be higher than the refractive index of the main resin, or lower than the refractive index of the main resin, as long as the difference between the internal diffusion particles and the main resin is greater than or equal to 0.03.

[0048] In a specific embodiment provided by the present invention, the organic diffusion particles are preferably one or more of polystyrene microspheres, silica gel microspheres, acrylic copolymer microspheres and polymethyl methacrylate microspheres; wherein the refractive index of the polystyrene microspheres is 1.59; the refractive index of the silica gel microspheres is 1.41-1.45; the refractive index of the acrylic copolymer microspheres is 1.45-1.47; and the refractive index of the polymethyl methacrylate microspheres is 1.49.

[0049] In a specific embodiment provided by the present invention, the inorganic diffusion particles are preferably one or more of silicon dioxide, titanium dioxide and aluminum oxide; wherein the refractive index of the silicon dioxide is 1.46; the refractive index of the titanium dioxide is 2.4-2.7; and the refractive index of the aluminum oxide is 1.76.

[0050] According to the present invention, in order to improve uniformity and reduce visible graininess, the particle size of the internal diffusion particles is 1 to 5 μm; the internal diffusion effect is poor if the particle size is lower than this, and the particle size higher than this will make the coating have a grainy feel; optionally, the particle size of the internal diffusion particles is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, or a range between any two of the above values.

[0051] According to the present invention, optionally, the content of the phosphorus-based flame retardant particles in the flame retardant anti-glare coating is 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight or a range between any two of the above values.

[0052] In the present invention, the phosphorus-based flame retardant particles can be used as outward-diffusion particles to scatter surface light and blur edges; the phosphorus-based flame retardant particles are preferably one or more of organic hypophosphites, phosphaphenanthrene flame retardants, phosphate flame retardants, and phosphorus-nitrogen flame retardants; the organic hypophosphites are organic hypophosphites well known to those skilled in the art, and are not particularly limited. In the present invention, preferably include but are not limited to one or more of methylethylphosphinate, diethylphosphinate, and methylcyclohexylphosphinate; the phosphaphenanthrene flame retardants are phosphaphenanthrene flame retardants well known to those skilled in the art, and are not particularly limited. In the present invention, preferably include but are not limited to 9,10- Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and / or 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide; the phosphate flame retardant is any phosphate flame retardant well known to those skilled in the art, without any special restrictions, and preferably includes but is not limited to one or more of triphenyl phosphate, pentaerythritol caged phosphate, bisphenol A bis(diphenyl) phosphate and resorcinol (diphenyl) phosphate; the phosphorus-nitrogen flame retardant is any phosphazene flame retardant well known to those skilled in the art, without any special restrictions, and preferably includes but is not limited to phosphazene and / or ammonium polyphosphate.

[0053] To ensure the anti-glare function of the coating, the particle size of the phosphorus-based flame retardant particles is 1 to 10 μm; below this particle size, the surface roughness is insufficient and the anti-glare performance decreases, and above this particle size, the coating will appear white in appearance; optionally, the particle size of the phosphorus-based flame retardant particles is 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm or a range between any two of the above values.

[0054] According to the present invention, optionally, the content of the auxiliary agent in the flame retardant anti-glare coating is 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight or a range between any two of the above values.

[0055] By adding additives, certain properties of flame retardant and anti-glare coatings can be improved, such as increasing the curing speed of the coating, improving the leveling and uniformity of the coating, and enhancing the adhesion of the coating. In the present invention, the additives preferably include one or more of a resin curing agent, a curing accelerator, a photoinitiator, a leveling agent, a silane coupling agent, and a defoaming agent.

[0056] In a specific embodiment provided by the present invention, the resin curing agent includes one or more of an amine curing agent, an acid anhydride curing agent and a phenolic resin curing agent; the amine curing agent includes but is not limited to one or more of aliphatic amine curing agents, alicyclic amine curing agents, aromatic amine curing agents and polyamide curing agents; the aliphatic amine curing agent includes but is not limited to ethylenediamine, diethylenetriamine, triethylenetetramine, etc.; the alicyclic amine curing agent includes but is not limited to isophoronediamine, menthanediamine, etc.; the aromatic amine curing agent includes but is not limited to diaminodiphenylmethane, diaminodiphenyl ether, etc.; the polyamide curing agent is formed by condensation of dimerized vegetable oil fatty acids and aliphatic amines; the acid anhydride curing agent includes but is not limited to phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, etc.

[0057] In a specific embodiment provided by the present invention, the content of the resin curing agent in the flame retardant anti-glare coating is preferably 15 to 25 parts by weight; optionally, the content of the resin curing agent in the flame retardant anti-glare coating is 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight or a range between any two of the above values.

[0058] In a specific embodiment provided by the present invention, the curing accelerator includes one or more of a tertiary amine accelerator, an imidazole derivative accelerator, an acetylacetone metal salt accelerator, a metal carboxylate accelerator, a peroxide accelerator and a phosphide accelerator; the tertiary amine accelerator includes but is not limited to 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, triethylamine, triethanolamine, o-hydroxybenzyldimethylamine, etc.; the imidazole derivative accelerator includes but is not limited to one or more of 2-methylimidazole, 2-ethyl-4-methylimidazole and 2-phenylimidazole; the general formula of the acetylacetone metal salt accelerator is M(CH3COCHCOCH3)2, wherein M includes but is not limited to aluminum, cobalt, nickel, copper, zinc, iron, vanadium, chromium, titanium, manganese, potassium, zirconium, etc.; the metal carboxylate accelerator includes but is not limited to stannous octoate, lead octoate, etc.; the peroxide accelerator includes but is not limited to benzoyl peroxide, etc.; the phosphide accelerator includes but is not limited to triphenylphosphine, etc.

[0059] In a specific embodiment provided by the present invention, the content of the curing accelerator in the flame retardant anti-glare coating is preferably 1 to 5 parts by weight; optionally, the content of the curing accelerator in the flame retardant anti-glare coating is 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight or a range between any two of the above values.

[0060] In a specific embodiment provided by the present invention, the photoinitiator includes an iodonium salt photoinitiator and / or a sulfonium salt photoinitiator; the iodonium salt photoinitiator includes but is not limited to diphenyliodonium hexafluorophosphate, diphenyliodonium tetrafluoroborate, (4-octyloxyphenyl)phenyliodonium hexafluorophosphate, bis(4-tert-butylphenyl)iodonium p-toluenesulfonate, etc.; the sulfonium salt photoinitiator includes but is not limited to triphenylsulfonium hexafluorophosphate, tris(4-methoxyphenyl)sulfonium tetrafluoroborate, bis(4-fluorophenyl)methylsulfonium hexafluoroantimonate, phenyldi(4-tert-butylphenyl)sulfonium p-toluenesulfonate, etc.

[0061] In a specific embodiment provided by the present invention, the content of the photoinitiator in the flame retardant anti-glare coating is preferably 1 to 5 parts by weight; optionally, the content of the photoinitiator in the flame retardant anti-glare coating is 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight or a range between any two of the above values.

[0062] In a specific embodiment provided by the present invention, the leveling agent includes one or more of a silicone leveling agent, an acrylate leveling agent and a fluorocarbon leveling agent; the silicone leveling agent includes but is not limited to polyether-modified polysiloxane, polyester-modified polysiloxane, long-chain alkyl-modified polysiloxane, etc.; the acrylate leveling agent includes but is not limited to pure acrylate leveling agents, fluorine-modified acrylate leveling agents, etc.

[0063] In a specific embodiment provided by the present invention, the content of the leveling agent in the flame retardant anti-glare coating is preferably 0.1 to 2 parts by weight; optionally, the content of the leveling agent in the flame retardant anti-glare coating is 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 2 parts by weight or a range between any two of the above values.

[0064] In a specific embodiment provided by the present invention, the silane coupling agent includes but is not limited to one or more of a vinyl silane coupling agent, an epoxy silane coupling agent, an amino silane coupling agent, a urea silane coupling agent and a mercapto silane coupling agent; the vinyl silane coupling agent includes but is not limited to vinyl triethoxysilane, vinyl trimethoxysilane, etc.; the epoxy silane coupling agent includes but is not limited to 2-(3,4-epoxycyclohexyl) ethyl trimethoxysilane, 3-glycidyloxypropyl methyl dimethoxysilane, 3-glycidyloxypropyl trimethoxysilane, 3-glycidyloxypropyl methyl diethoxysilane, 3-glycidoxypropyltriethoxysilane, etc.; the aminosilane coupling agent includes but is not limited to γ-aminopropyltriethoxysilane (KH550), N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (KH792), N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane (KH602), etc.; the urea-based silane coupling agent includes but is not limited to γ-urea-based propyl-trimethoxysilane, γ-urea-based propyl-methyldimethoxysilane, etc.; the mercaptosilane coupling agent includes but is not limited to 3-mercaptopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, etc.

[0065] In a specific embodiment provided by the present invention, the content of the silane coupling agent in the flame retardant anti-glare coating is preferably 0.1 to 2 parts by weight; optionally, the content of the silane coupling agent in the flame retardant anti-glare coating is 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 2 parts by weight or a range between any two of the above values.

[0066] In a specific embodiment provided by the present invention, the defoaming agent includes a silicone defoaming agent and / or a non-silicone defoaming agent; the silicone defoaming agent includes but is not limited to polydimethylsiloxane defoaming agent, polyether modified silicone defoaming agent, etc.; the non-silicone defoaming agent includes but is not limited to mineral oil-based defoaming agent, polyether defoaming agent, alcohol defoaming agent, etc.

[0067] In a specific embodiment provided by the present invention, the content of the defoaming agent in the flame retardant anti-glare coating is preferably 0 to 2 parts by weight; optionally, the content of the defoaming agent in the flame retardant anti-glare coating is 0 parts by weight, 0.1 parts by weight, 0.5 parts by weight, 1 part by weight, 2 parts by weight or a range between any two of the above values.

[0068] According to the present invention, the flame retardant and anti-glare coating can be prepared according to a method well known to those skilled in the art without any special restrictions. Specifically, the preparation can be carried out according to the following steps: the main resin, active diluent, internal diffusion particles, phosphorus-based flame retardant particles and additives are degassed by vacuum stirring to obtain the flame retardant and anti-glare coating; the stirring speed is preferably 1000 to 2000 rpm; and the stirring time is 10 to 20 minutes.

[0069] The flame-retardant and anti-glare coating provided by the present invention contains internal diffusion particles and phosphorus-based flame-retardant particles. The internal diffusion particles can evenly distribute light from the source and reduce color separation. The phosphorus-based flame-retardant particles can serve as external diffusion particles to scatter surface light and blur edges, thereby improving the ink color difference of the substrate. Using it for COB surface f packaging can replace COB packaging glue and film, simplifying the process and saving costs. Moreover, the phosphorus-based flame-retardant particles also make the coating flame-retardant. When the coating is encapsulated and used on LED substrates, the LED display modules and screens can be flame-retardant and can pass UL 94 V-0 and 5VA and BS476-7 Class 1 standards. It can be used indoors and outdoors.

[0070] The present invention also provides a flame retardant and anti-glare coating, which is formed by film-forming and curing the flame retardant and anti-glare coating.

[0071] Among them, the film-forming method is a method well known to those skilled in the art and is not particularly limited. In the present invention, the release film transfer coating technology is preferably used for film formation; if the main resin is a thermosetting resin, the release film transfer coating technology is preferably used for film formation under heating conditions; the heating temperature is preferably 130°C to 180°C, more preferably 140°C to 160°C, and even more preferably 150°C; the film-forming time of the release film transfer coating technology is 5 to 15 minutes.

[0072] The curing method is any method well known to those skilled in the art and is not particularly limited. If the main resin is a thermosetting resin, the curing is performed by heating; the temperature of the heating curing is 130°C to 180°C; the time of the heating curing is 1 to 3 hours; if the main resin is a UV curing resin, the curing is performed by UV curing; the light source of the UV curing is preferably a high-pressure mercury lamp; the exposure energy of the UV curing is preferably 1000 to 2000 mJ / cm 2 ; Optionally, the exposure energy of the UV curing is 1000mJ / cm 2 、1200mJ / cm 2 、1500mJ / cm 2 、1800mJ / cm 2 , 2000mJ / cm 2 Or the range between any two of the above values.

[0073] According to the present invention, the thickness of the flame retardant anti-glare coating is preferably 150 to 250 μm; optionally, the thickness of the flame retardant anti-glare coating is 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm or a range between any two of the above values.

[0074] The present invention also provides an LED display module, comprising a substrate, a plurality of LED light-emitting chips arranged on the substrate, and an anti-glare flame-retardant coating arranged between the plurality of LED light-emitting chips and on a surface away from the substrate; the anti-glare flame-retardant coating is formed by film-forming and curing the above-mentioned flame-retardant anti-glare coating.

[0075] The anti-glare flame-retardant coating provided by the present invention can be used as a single-layer packaging glue for COB surface packaging, replacing the COB packaging glue plus film, thereby simplifying the process and saving costs.

[0076] The present invention also provides a preparation method of the above-mentioned LED display module, which, when the main resin is a thermosetting resin, comprises the following steps: fixing a substrate provided with a number of LED light-emitting chips on a preset molding jig after plasma cleaning, coating the above-mentioned flame retardant and anti-glare coating on a release film for molding, and then taking it out for curing to obtain an LED display module; the molding temperature is preferably 130°C to 180°C, more preferably 140°C to 160°C, and even more preferably 150°C; the molding time is preferably 5 to 15 minutes; since the molding is carried out under heating conditions, the flame retardant and anti-glare coating is also pre-cured during the molding process; the molding thickness is preferably 150 to 250 μm; the curing temperature is 130°C to 180°C; and the curing time is preferably 1 to 3 hours.

[0077] Alternatively, when the main resin is a UV curable resin, the method includes the following steps: fixing a substrate provided with a plurality of LED light-emitting chips on a preset fixture after plasma cleaning, transferring the flame retardant anti-glare coating to the surface of the substrate provided with a plurality of LED light-emitting chips through a release film, and UV curing to obtain an LED display module; the light source for UV curing is preferably a high-pressure mercury lamp; the exposure energy for UV curing is preferably 1000 to 2000 mJ / cm 2 ; Optionally, the exposure energy of the UV curing is 1000mJ / cm 2 、1200mJ / cm 2 、1500mJ / cm 2 、1800mJ / cm 2 , 2000mJ / cm 2Or the range between any two of the above values; it is also preferably allowed to stand after UV curing; the standing time is preferably 1 to 10 minutes, more preferably 3 to 8 minutes, and even more preferably 5 minutes.

[0078] See also Figure 1 , Figure 1 This is a schematic diagram of the preparation process of the LED display module provided by the present invention.

[0079] The present invention also provides a display screen, comprising the above-mentioned LED display module.

[0080] To further illustrate the present invention, a flame retardant anti-glare paint, a flame retardant anti-glare coating, an LED display module and a display screen provided by the present invention are described in detail below with reference to the embodiments.

[0081] The reagents used in the following examples are all commercially available.

[0082] Example 1

[0083] Table 1 Ingredients of coating of Example 1

[0084]

[0085]

[0086] 1. The ingredient list of Example 1 is shown in Table 1.

[0087] 2. Add the materials in the ingredient list into the ingredient tray according to the proportion, use a vacuum high-speed stirring degassing machine to stir and degas, the speed is 1000 rpm, the time is 10 minutes, and the dispersed materials are allowed to stand for 10 minutes to obtain the flame retardant anti-glare coating.

[0088] 3. After plasma cleaning, the LED light board with COB chip and driver IC is fixed on the preset molding fixture, and the flame retardant anti-glare coating is extruded onto the release film for pressing. The pressing temperature is 150℃, the pressing time is 5min, and the molding thickness is 150μm. After molding, the substrate is removed and post-cured at 150℃ and 2h to obtain the LED display module.

[0089] 4. Performance Testing

[0090] ① Flame retardancy test: Cut the cured LED display module into 125mm long x 13mm wide strips, a total of 5 strips, and conduct flame retardancy test according to UL 94 standard. The flame retardancy afterflame test results are shown in Table 2, and the UL 94V-0 test results are shown in the figure below. Figure 2 As shown; prepare 270mm×295mm specification LED module, carry out flame retardant test according to BS 476-7 standard, obtain flame spread result as shown in Table 2, obtain BS476-7 test effect diagram as shown in Figure 3 shown.

[0091] ② Anti-glare test: The cured LED display module was subjected to a light shadow test and a gloss test. The results are shown in Table 2.

[0092] Test method: Place the gloss meter on a black standard plate, turn on the power to enter calibration mode (the LCD screen displays "calibration"), and press the test button to complete automatic calibration. The calibration angle usually includes 20°. Ensure that the surface of the sample to be tested is clean and free of contamination (such as oil stains and dust). Place it flat on a stable table to avoid measurement errors caused by tilting. Place the gloss meter probe vertically against the sample surface, press the test button to obtain data, and measure three times in a row to obtain the average value to ensure the stability of the results.

[0093] Table 2 Performance test results of the LED display module obtained in Example 1

[0094]

[0095]

[0096] Note: The numbers in Table 1 refer to multiple sample numbers in different tests. Samples with the same number in different tests are not necessarily the same sample.

[0097] Example 2

[0098] Table 3 Ingredients of coating of Example 2

[0099]

[0100] 1. The ingredient list of Example 2 is shown in Table 3.

[0101] 2. Add the materials in the ingredient list into the ingredient tray according to the proportion, use a vacuum high-speed stirring degassing machine to stir and degas, the speed is 2000rpm, the time is 15min, and the dispersed materials are allowed to stand for 10min to obtain the flame retardant anti-glare coating.

[0102] 3. After plasma cleaning, the LED light board with COB chip and driver IC is fixed on the preset fixture. The flame retardant anti-glare coating with a thickness of 200μm is transferred to the LED light board through the release film. It is exposed with UV light. The light source is a high-pressure mercury lamp with an exposure energy of 1500mJ / cm 2 After exposure, the LED display module was obtained by standing for 5 minutes.

[0103] 4. Performance Testing

[0104] ① Flame retardancy test: The cured LED display module was cut into five strips measuring 125 mm long and 13 mm wide. Flame retardancy testing was performed according to the UL 94 standard. The flame spread test results are shown in Table 4. A 270 mm × 295 mm LED module was prepared and flame spread testing was performed according to the BS 476-7 standard. The flame spread results are shown in Table 4.

[0105] ② Anti-glare test: The cured LED module was subjected to a light shadow test and a gloss test (the test method was the same as in Example 1). The results are shown in Table 4.

[0106] Table 4 Performance test results of the LED display module obtained in Example 2

[0107]

[0108] Note: The numbers in Table 4 refer to multiple sample numbers in different tests. Samples with the same number in different tests are not necessarily the same sample.

[0109] Comparative Example 1

[0110] An LED display module was prepared according to the method of Example 1, except that the flame retardant and anti-glare particles were replaced with aluminum hydroxide, and the particle size was changed to 3 μm.

[0111] Table 5 Ingredients of coating of comparative example 1

[0112]

[0113] The performance test was carried out according to the method of Example 1, and the results are shown in Table 6.

[0114] Table 6 Performance test results of the LED display module obtained in Comparative Example 1

[0115]

[0116] Note: The numbers in Table 6 refer to multiple sample numbers in different tests. Samples with the same number in different tests are not necessarily the same sample.

[0117] Comparative Example 2

[0118] An LED display module was prepared according to the method of Example 1, and the particle size of the flame retardant and anti-glare particles 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide was changed to 0.5 μm.

[0119] Table 7 Ingredients of coating of comparative example 2

[0120]

[0121] The performance test was carried out according to the method of Example 1, and the results are shown in Table 8.

[0122] Table 8 Performance test results of the LED display module obtained in Comparative Example 2

[0123]

[0124] Note: The numbers in Table 8 refer to multiple sample numbers in different tests. Samples with the same number in different tests are not necessarily the same sample.

[0125] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A flame retardant anti-glare coating, characterized in that: include: The particle size of the internal diffusion particles is 1 to 5 μm; The particle size of the phosphorus-based flame retardant particles is 1 to 10 μm.

2. The flame retardant anti-glare coating according to claim 1, characterized in that: The main resin is selected from a thermal curing resin or a UV curing resin; The thermosetting resin is selected from one or more of epoxy resin, silicone resin, acrylic resin and saturated polyester resin; The UV curable resin is selected from one or more of epoxy acrylic resin, silicone acrylic resin, polyester acrylic resin and alicyclic epoxy resin; When the main resin is a thermosetting resin, the reactive diluent is selected from one or more of butyl glycidyl ether, phenyl glycidyl ether, ethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl ether and glycerol triglycidyl ether; When the main resin is a UV curing resin, the reactive diluent is selected from one or more of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3-oxetane, 4-vinyl-1-cyclohexene-1,2-epoxy, 1-methyl-1,2-epoxycyclohexane, glycidyl acrylate, methacrylate oxetane, 3-ethyl-3-oxetanemethanol, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and (3,4-epoxycyclohexyl)methyl acrylate.

3. The flame retardant anti-glare coating according to claim 1, characterized in that: The main resin is an epoxy resin; the molecular weight of the epoxy resin is 300 to 700 g / mol; and / or the epoxy equivalent weight of the epoxy resin is 180 to 250 g / eq; Alternatively, the main resin is selected from epoxy acrylic resin and / or alicyclic epoxy resin; the number of functional groups of the epoxy acrylic resin and the alicyclic epoxy resin is independently an integer of 4 to 6.

4. The flame retardant anti-glare coating according to claim 1, characterized in that: The mass ratio of the main resin to the active diluent is (4-5):

1.

5. The flame retardant anti-glare coating according to claim 1, characterized in that: The difference in refractive index between the main resin and the internal diffusion particles is greater than or equal to 0.

03.

6. The flame retardant anti-glare coating according to claim 1, characterized in that: The internal diffusion particles are selected from organic diffusion particles and / or inorganic diffusion particles; the organic diffusion particles are selected from one or more of polystyrene microspheres, silica gel microspheres, acrylic copolymer microspheres and polymethyl methacrylate microspheres; the inorganic diffusion particles are selected from one or more of silicon dioxide, titanium dioxide and aluminum oxide; And / or, the phosphorus-based flame retardant particles are selected from one or more of organic hypophosphites, phosphaphenanthrene flame retardants, phosphate flame retardants and phosphorus-nitrogen flame retardants; The organic hypophosphite is selected from one or more of methylethylphosphinate aluminum, diethylphosphinate aluminum and methylcyclohexylphosphinate aluminum; The phosphaphenanthrene flame retardant is selected from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and / or 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide; The phosphate flame retardant is selected from one or more of triphenyl phosphate, pentaerythritol caged phosphate, bisphenol A bis(diphenyl) phosphate and resorcinol (diphenyl) phosphate; The phosphorus-nitrogen flame retardant is selected from phosphazene and / or ammonium polyphosphate.

7. The flame retardant anti-glare coating according to claim 1, characterized in that: The auxiliary agent includes one or more of a resin curing agent, a curing accelerator, a photoinitiator, a leveling agent, a silane coupling agent and a defoaming agent; The resin curing agent includes one or more of an amine curing agent, an acid anhydride curing agent and a phenolic resin curing agent; The curing accelerator includes one or more of tertiary amine accelerators, imidazole derivative accelerators, acetylacetone metal salt accelerators, metal carboxylate accelerators, peroxide accelerators and phosphide accelerators; The photoinitiator includes an iodonium salt photoinitiator and / or a sulfonium salt photoinitiator; The leveling agent includes one or more of an organic silicon leveling agent, an acrylic leveling agent and a fluorocarbon leveling agent; The silane coupling agent includes one or more of a vinyl silane coupling agent, an epoxy silane coupling agent, an amino silane coupling agent, a urea silane coupling agent and a mercapto silane coupling agent; The defoaming agent includes an organosilicon defoaming agent and / or a non-silicon defoaming agent.

8. A flame retardant anti-glare coating, characterized in that: The flame retardant and anti-glare coating is formed by film-forming and curing the flame retardant and anti-glare coating according to any one of claims 1 to 7.

9. An LED display module, characterized in that: The invention comprises a substrate, a plurality of LED light-emitting chips arranged on the substrate, and an anti-glare flame-retardant coating arranged between the plurality of LED light-emitting chips and on a surface away from the substrate; the anti-glare flame-retardant coating is formed by film-forming and curing the flame-retardant anti-glare coating according to any one of claims 1 to 7.

10. A display screen, characterized in that: Including the LED display module according to claim 9.

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