CN108410347B - Water-based UV (ultraviolet) coating for LED (light-emitting diode) light source - Google Patents

Water-based UV (ultraviolet) coating for LED (light-emitting diode) light source Download PDF

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CN108410347B
CN108410347B CN201810363703.9A CN201810363703A CN108410347B CN 108410347 B CN108410347 B CN 108410347B CN 201810363703 A CN201810363703 A CN 201810363703A CN 108410347 B CN108410347 B CN 108410347B
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coating
weight
water
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light source
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CN108410347A (en
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杨年富
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Huzhou Jifu New Material Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04Polyurethanes
    • C09D175/14Polyurethanes having carbon-to-carbon unsaturated bonds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0486Operating the coating or treatment in a controlled atmosphere
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/63Additives non-macromolecular organic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2502/00Acrylic polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2602/00Organic fillers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group

Abstract

The water-based UV coating for the LED light source comprises 100 parts by weight of water-based aliphatic polyurethane acrylate resin, 20-50 parts by weight of water-based aliphatic polyurethane dispersion, 1-20 parts by weight of acrylic monomer, 1-10 parts by weight of photoinitiator and 1-15 parts by weight of addition auxiliary agent, wherein the solid content of the water-based UV coating is 30-60%, and the photoinitiator is selected from two or more of Irgacure500, IRGACURE 819 DW, photoinitiator 1173, photoinitiator 184, TPO and TPO-L. According to the invention, the wear resistance of the UV coating after the LED light source is cured is greatly improved by introducing the aqueous aliphatic polyurethane dispersoid and adopting a specific photoinitiator and a drying process.

Description

Water-based UV (ultraviolet) coating for LED (light-emitting diode) light source
Technical Field
The invention relates to an LED light source water-based UV coating.
Background
An energy-saving LED light source curing system is available in the market at present, and a special UV gloss oil is coated on a printing material and then is cured by the energy-saving LED light source curing system. The curing system has the following main characteristics: compared with the traditional high-pressure mercury lamp device, the energy consumption of the curing system is lower, and the power consumption is only 10 percent of that of the traditional mercury lamp type curing agent; the service life of the LED-UV light source can reach 2-3 ten thousand hours, which is dozens of times of that of the existing high-pressure mercury lamp and metal halogen lamp (1500 hours); in addition, the LED light source has the characteristics of small heat and the like, the photoelectric conversion efficiency of the LED light source is high, too much heat cannot be generated, and the shrinkage deformation of a printed product caused by overheating can be effectively prevented.
The water-based UV coating is a new-generation photocuring coating which is recently developed, has the advantages of high curing speed, high production efficiency, high fullness of a paint film and the like of the photocuring coating, and simultaneously uses water as a solvent to replace an organic solvent, thereby greatly reducing the volatile content of VOC and well meeting the environmental protection requirement of the current generation.
The LED light source curing system has the advantages of low energy consumption, low heat, long service life of the lamp tube and the like, but the common water-based UV coating cannot be cured in the LED system. Because the whole ultraviolet spectrum of 200-400 nm is utilized in the traditional UV gloss oil curing, and the light emitted by the LED curing system is a long-wave band and is only concentrated in a narrow range in the ultraviolet spectrum, usually 390-405 nm, the defects that the gloss oil cannot be cured, the odor is large, the glossiness is low, the wear resistance is poor and the like can occur when the common water-based UV coating is cured by the LED system.
Therefore, in the field, it is desirable to develop an LED light source aqueous UV coating that can be applied to an LED light source curing system, so as to overcome the technical problems that the common LED light source aqueous UV coating cannot be cured and is not wear-resistant in the LED curing system.
Disclosure of Invention
In order to solve the technical problems, the invention provides an LED light source water-based UV coating, which comprises 100 parts by weight of water-based aliphatic polyurethane acrylate resin, 20-50 parts by weight of water-based aliphatic polyurethane dispersion, 1-20 parts by weight of acrylic monomer, 1-10 parts by weight of photoinitiator and 1-15 parts by weight of addition auxiliary agent, wherein the solid content of the water-based UV coating is 30-60%, and the photoinitiator is selected from two or more of Irgacure500, IRGACURE 819 DW, photoinitiator 1173, photoinitiator 184, TPO and TPO-L.
The photoinitiator is a mixture of IRGACURE 819 DW, Irgacure500 and TPO-L, and the mass ratio of the IRGACURE 819 DW, the Irgacure500 and the TPO-L is 1: (5-10): (5-10).
The additive is one or more selected from defoaming agent, flatting agent, wetting dispersant, anti-sagging additive and adhesion promoter.
The defoaming agent is selected from one or more of a foam breaking polysiloxane solution, a polyether modified polydimethylsiloxane solution, a mixture of organic silicon-free foam breaking polysiloxane and hydrophobic solids, and a silicon oxide polyether emulsion.
The leveling agent is selected from one or more of polyether modified siloxane solution, nonionic acrylic copolymer solution, ionic polyacrylate solution, polyether modified acrylic dimethyl siloxane solution capable of agglomerating, and polyether modified acrylic functional dimethyl siloxane solution.
The wetting and dispersing agent is selected from one or more of hydroxyl ammonium salt solution of low molecular weight polycarboxylic acid polymer, alcohol ammonium salt solution of polyfunctional polymer, alkyl ammonium salt of partially neutralized polycarboxylic acid polymer and polysiloxane copolymer solution.
The adhesion promoter is selected from one or more silane coupling agents selected from gamma-aminopropyltrimethoxysilane, aminopropyltriethoxysilane 3-aminopropyltrimethoxysilane 3-glycidyloxypropyltrimethoxysilane gamma-methacryloxypropyltrimethoxysilane gamma-mercaptopropyltriethoxysilane.
The water-based UV coating also comprises 5-30 parts by weight of hydrophobic unsaturated quaternary ammonium salt compound, wherein the structure of the hydrophobic unsaturated quaternary ammonium salt compound is as follows:
wherein R is1Is a long-chain hydrophobic group, R2Is methyl or ethyl, R3、R4Is a group containing an unsaturated bond.
A spray curing process, the spray curing process comprising the steps of:
spraying: spraying the water-based UV coating on the substrate according to the coating weight of 80-100 g per square meter;
a first dehumidification step: placing the sprayed base material in a room to be dried for 0.2-3 hours, wherein the temperature in the room to be dried is controlled at 20-28 ℃, and the humidity is controlled below 30% rh;
a second dehumidification step: when the temperature of the drying room is raised to 30-35 ℃ and kept for 0.5-3 hours, the humidity is controlled below 30% rh;
a third dehumidification step: heating the drying room to 60-70 ℃ and keeping for 5-20 minutes, and controlling the humidity below 30% rh;
and (3) curing: and (3) carrying out photocuring on the base material sprayed with the water-based UV coating under the condition that the humidity is controlled to be below 30% rh.
The light energy of the photocuring is 400-800 joules, the vertical distance between the lamp tube and the surface of the base material is controlled to be less than 20cm, the lamp tube is fixed, and the conveying speed of the base material is 10-20 m/min.
According to the invention, the wear resistance of the UV coating after the LED light source is cured is greatly improved by introducing the aqueous aliphatic polyurethane dispersoid and adopting a specific photoinitiator and a drying process.
The above-described and other features, aspects, and advantages of the present application will become more apparent with reference to the following detailed description.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The water-based UV coating for the LED light source comprises 100 parts by weight of water-based aliphatic polyurethane acrylate resin, 20-50 parts by weight of water-based aliphatic polyurethane dispersion, 1-20 parts by weight of acrylic monomer, 1-10 parts by weight of photoinitiator and 1-15 parts by weight of addition auxiliary agent, wherein the solid content of the water-based UV coating is 30-60%, and the photoinitiator is selected from two or more of Irgacure500, IRGACURE 819 DW, photoinitiator 1173, photoinitiator 184, TPO and TPO-L.
Aqueous aliphatic polyurethane acrylate resin
The waterborne aliphatic polyurethane acrylate resin is selected from the commercially available waterborne aliphatic polyurethane acrylate resins with the weight average molecular weight of 1500-.
Acrylic acid monomer
The acrylic monomer is selected from aqueous monofunctional monomers such as HEMA, HEA, HPA, NVP.
Aqueous aliphatic polyurethane dispersions
The waterborne aliphatic polyurethane dispersion is obtained by neutralizing and dispersing a prepolymer, which is obtained by polymerization reaction of aliphatic diisocyanate, polyol and dihydric alcohol containing hydrophilic groups, in water at high speed, wherein the molecular weight of the waterborne aliphatic polyurethane dispersion is 4000-5000 daltons, and the content of hydroxyl groups is lower than 0.01%.
(1) The aliphatic diisocyanate is selected from one or two or more of HDI, HMDI, IPDI and XDI;
(2) the polyol may be a polyether polyol such as polyethylene glycol, polypropylene glycol, polytetrahydrofuran or mixtures thereof; the polyol used may also be a polyester polyol such as a polyacyladipate polyol, a polycarbonate polyol, a polycaprolactone polyol or a mixture thereof. Preferably polyester polyols, having a molecular weight of 400-;
(3) the dihydric alcohol containing hydrophilic groups comprises one or both of dimethylolpropionic acid (DMPA) and dimethylolbutyric acid (DMBA).
As a preferred embodiment, the photoinitiator is a mixture of IRGACURE 819 DW, Irgacure500 and TPO-L, and the mass ratio of the IRGACURE 819 DW, the Irgacure500 and the TPO-L is 1: (5-10): (5-10).
The additive is one or more selected from defoaming agent, leveling agent, wetting dispersant, anti-sagging additive and adhesion promoter.
The defoaming agent is selected from one or more of foam breaking polysiloxane solution, polyether modified polydimethylsiloxane solution, a mixture of foam breaking polysiloxane and hydrophobic solid without organic silicon and silicon oxide polyether emulsion. Wherein the non-volatile part of the foam breaking polysiloxane solution is 15-30%, the non-volatile part of the polyether modified polydimethylsiloxane solution is 50-70%, the non-volatile part of the mixture of the foam breaking polysiloxane solution without organic silicon and the hydrophobic solid is 20-38%, and the non-volatile part of the silicon oxide polyether emulsion is 20-35%.
The defoaming agent is preferably a mixture of polyether modified polydimethylsiloxane solution, defoaming polysiloxane without organic silicon and hydrophobic solid in polyethylene glycol, and the compounding weight ratio is (1-2) to 1.
The leveling agent is selected from one or more of polyether modified siloxane solution, nonionic acrylic copolymer solution, ionic polyacrylate solution, polyether modified acrylic functional group dimethyl siloxane solution and polyether modified acrylic functional group dimethyl siloxane solution, and preferably polyether modified siloxane solution.
The wetting and dispersing agent of the present invention is selected from one or more of a low molecular weight polycarboxylic acid polymer hydroxylammonium salt solution, a polyfunctional polymer alcoholammonium salt solution, a partially neutralized polycarboxylic acid polymer hydrocarbylammonium salt, and a polysiloxane copolymer solution. Wherein the non-volatile part of the low molecular weight polybasic carboxylic acid polymer hydroxyl ammonium salt solution type wetting dispersant is 40-60%, the non-volatile part of the polyfunctional group polymer alcohol ammonium salt solution type wetting dispersant is 30-50%, and the non-volatile part of the partially neutralized polybasic carboxylic acid polymer hydroxyl ammonium salt and the polysiloxane copolymer solution type wetting dispersant is 40-60%; preferred are the olammonium salt solution type wetting dispersants of the multifunctional polymer.
The anti-sagging auxiliary agent is selected from one or more of a polyurethane solution, a urea modified polyurethane solution and a poly-hydrocarbyl carboxylic acid amide solution.
The adhesion promoter is selected from nonionic compound promoters, silane coupling agents, phthalate coupling agents and the like, and preferably silane coupling agents. Wherein the silane coupling agent is selected from one or more of gamma-aminopropyltrimethoxysilane, aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane and gamma-mercaptopropyltriethoxysilane.
As a preferred embodiment, the aqueous UV coating further includes 5 to 30 parts by weight of a hydrophobic unsaturated quaternary ammonium salt compound having the following structure:
wherein R is1Is a long-chain hydrophobic group, R2Is methyl or ethyl, R3、R4Is a group containing an unsaturated bond.
The preparation method of the hydrophobic unsaturated quaternary ammonium salt compound comprises the following steps:
the hydrophobic unsaturated quaternary ammonium salt compound can be well matched with the aqueous aliphatic polyurethane dispersoid, a hydrophobic layer is quickly formed in the drying process, the drying of the water content of the coating is facilitated, and the wear resistance of the obtained coating is greatly enhanced.
A spray curing process of a water-based UV coating, comprising the following steps:
spraying: spraying the water-based UV coating on the substrate according to the coating weight of 80-100 g per square meter;
a first dehumidification step: placing the sprayed base material in a room to be dried for 0.2-3 hours, wherein the temperature in the room to be dried is controlled at 20-28 ℃, and the humidity is controlled below 30% rh;
a second dehumidification step: when the temperature of the drying room is raised to 30-35 ℃ and kept for 0.5-3 hours, the humidity is controlled below 30% rh;
a third dehumidification step: heating the drying room to 60-70 ℃ and keeping for 5-20 minutes, and controlling the humidity below 30% rh;
and (3) curing: and (3) carrying out photocuring on the base material sprayed with the water-based UV coating under the condition that the humidity is controlled to be below 30% rh.
The light energy of the photocuring is 400-800 joules, the vertical distance between the lamp tube and the surface of the base material is controlled to be less than 20cm, the lamp tube is fixed, and the conveying speed of the base material is 10-20 m/min.
Hereinafter, the present invention will be described in more detail by way of examples, but it should be understood that these examples are merely illustrative and not restrictive. The starting materials used are all commercially available, unless otherwise stated.
The present invention is described in detail below with reference to several examples.
Aqueous aliphatic polyurethane dispersion X1
Heating the A component PTMEG1000, the B component HDI and the C component BDO to 100, 60 and 80 ℃ respectively, and adding 40ppm of DabcoT-9, 0.2 percent of Irganox1010, 0.2 percent of Irgafos168, 0.4 percent of Tinuvin 329 and 0.4 percent of Tinuvin 292 into the A component; adding DMBA with the mass of 1.31 times of that of BDO into the component C, and maintaining the temperature at 80, 60 and 60 ℃ after the three components are fully and uniformly melted;
after A, B, C three components are uniformly mixed in the proportion of 57.7 wt%, 33.4 wt% and 8.9 wt%, part of HDI is added so that the molar ratio of NCO groups to OH groups in the mixed solution is 1.2: 1, heating to 140 ℃ and 180 ℃, reacting for 2min under the stirring of the rotation speed of 200rpm, and then carrying out underwater granulation and collection to obtain waterborne polyurethane particles;
and sequentially putting 20Kg of the waterborne polyurethane particles into a mixture containing 50Kg of acetone/water (the mass ratio is 3:2), adding 700g of TEA, heating to 70 ℃, keeping the temperature for 2h at 200rpm to ensure that the waterborne polyurethane particles are completely emulsified and dispersed, desolventizing, cooling and filtering to obtain a waterborne aliphatic polyurethane dispersion with the solid content of 60.0 percent by weight, wherein the molecular weight of the waterborne aliphatic polyurethane dispersion is 4000 daltons.
Aqueous aliphatic polyurethane dispersion X2
Heating the A component PTMEG1000, the B component HDI and the C component BDO to 100, 60 and 80 ℃ respectively, and adding 40ppm of DabcoT-9, 0.2 percent of Irganox1010, 0.2 percent of Irgafos168, 0.4 percent of Tinuvin 329 and 0.4 percent of Tinuvin 292 into the A component; adding DMBA with the mass of 1.31 times of that of BDO into the component C, and maintaining the temperature at 80, 60 and 60 ℃ after the three components are fully and uniformly melted;
after A, B, C three components are uniformly mixed in the proportion of 57.7 wt%, 33.4 wt% and 8.9 wt%, part of HDI is added so that the molar ratio of NCO groups to OH groups in the mixed solution is 1.2: 1, heating to 140 ℃ and 180 ℃, reacting for 6min under the stirring of the rotation speed of 200rpm, and then carrying out underwater granulation and collection to obtain waterborne polyurethane particles;
and sequentially putting 20Kg of the waterborne polyurethane particles into 50Kg of acetone/water mixture (the mass ratio is 3:2), adding 69.4Kg of TEA, heating to 70 ℃, keeping the temperature for 2h at 200rpm to ensure that the waterborne polyurethane particles are completely emulsified and dispersed, desolventizing, cooling and filtering to obtain a waterborne aliphatic polyurethane dispersion with the solid content of 60.0 wt%, wherein the molecular weight of the waterborne aliphatic polyurethane dispersion is 5000 daltons.
Aqueous aliphatic polyurethane dispersion X3
Heating the A component PTMEG2000, the B component HDI and the C component BDO to 100 ℃, 60 and 80 ℃ respectively, and adding 40ppm of DabcoT-9, 0.2 percent of Irganox1010, 0.2 percent of Irgafos168, 0.4 percent of Tinuvin 329 and 0.4 percent of Tinuvin 292 into the A component; adding DMBA with the mass of 1.31 times of that of BDO into the component C, and maintaining the temperature at 80, 60 and 60 ℃ after the three components are fully and uniformly melted;
after A, B, C three components are uniformly mixed in the proportion of 57.7 wt%, 33.4 wt% and 8.9 wt%, part of HDI is added so that the molar ratio of NCO groups to OH groups in the mixed solution is 1.2: 1, heating to 140 ℃ and 180 ℃, reacting for 2min under the stirring of the rotation speed of 200rpm, and then carrying out underwater granulation and collection to obtain waterborne polyurethane particles;
and sequentially putting 20Kg of the waterborne polyurethane particles into 50Kg of acetone/water mixture (the mass ratio is 3:2), adding 69.4Kg of TEA, heating to 70 ℃, keeping the temperature for 2h at 200rpm to ensure that the waterborne polyurethane particles are completely emulsified and dispersed, desolventizing, cooling and filtering to obtain a waterborne aliphatic polyurethane dispersion with the solid content of 60.0 wt%, wherein the molecular weight of the waterborne aliphatic polyurethane dispersion is 7000 Dalton.
Hydrophobic unsaturated quaternary ammonium salt compound N1
Example 1
The composition of the water-based UV coating comprises: 100 parts by weight of waterborne aliphatic polyurethane acrylate resin (Shenzhen Youyang technology GP-5132), 30 parts by weight of waterborne aliphatic polyurethane dispersion X1, 5 parts by weight of acrylic monomer HEA, 4 parts by weight of photoinitiator (0.2 part by weight of IRGACURE 819 DW, 2 parts by weight of Irgacure500 and 1.8 parts by weight of TPO-L), 8 parts by weight of addition auxiliary agent (2 parts by weight of silicon-oxidized polyether emulsion defoamer, 2 parts by weight of polyether modified siloxane solution defoamer, 2 parts by weight of low molecular weight polycarboxylic acid polymer hydroxyl ammonium salt solution wetting dispersant, 2 parts by weight of silane coupling agent gamma-aminopropyltrimethoxysilane), and adding a proper amount of water to enable the solid content of the waterborne UV coating to be 50%.
Example 2
The composition of the water-based UV coating comprises: 100 parts by weight of waterborne aliphatic polyurethane acrylate resin (Shenzhen Youyang technology GP-5132), 40 parts by weight of waterborne aliphatic polyurethane dispersion X2, 10 parts by weight of acrylic monomer NVP, 4 parts by weight of photoinitiator (0.2 part by weight of IRGACURE 819 DW, 2 parts by weight of Irgacure500 and 1.8 parts by weight of TPO-L), 8 parts by weight of addition auxiliary agent (2 parts by weight of silicon-oxidized polyether emulsion defoamer, 2 parts by weight of polyether modified siloxane solution defoamer, 2 parts by weight of low molecular weight polycarboxylic acid polymer hydroxyl ammonium salt solution wetting dispersant, 2 parts by weight of silane coupling agent gamma-aminopropyltrimethoxysilane), and adding a proper amount of water to enable the solid content of the waterborne UV coating to be 50%.
Example 3
The composition of the water-based UV coating comprises: 100 parts by weight of waterborne aliphatic polyurethane acrylate resin (Shenzhen Youyang technology GP-5132), 30 parts by weight of waterborne aliphatic polyurethane dispersion X3, 5 parts by weight of acrylic monomer HEMA, 4 parts by weight of photoinitiator (0.2 part by weight of IRGACURE 819 DW, 2 parts by weight of Irgacure500 and 1.8 parts by weight of TPO-L), 8 parts by weight of addition auxiliary agent (2 parts by weight of silicon-oxidized polyether emulsion defoamer, 2 parts by weight of polyether modified siloxane solution defoamer, 2 parts by weight of low molecular weight polycarboxylic acid polymer hydroxyl ammonium salt solution wetting dispersant, 2 parts by weight of silane coupling agent gamma-aminopropyltrimethoxysilane), and adding a proper amount of water to enable the solid content of the waterborne UV coating to be 50%.
Example 4
The composition of the water-based UV coating comprises: 100 parts by weight of waterborne aliphatic polyurethane acrylate resin (Shenzhen Youyang technology GP-5132), 30 parts by weight of waterborne aliphatic polyurethane dispersion X3, 5 parts by weight of acrylic monomer HEMA, 10 parts by weight of hydrophobic unsaturated quaternary ammonium salt compound N1, 4 parts by weight of photoinitiator (0.2 parts by weight of IRGACURE 819 DW, 2 parts by weight of Irgacure500 and 1.8 parts by weight of TPO-L), 8 parts by weight of addition additives (2 parts by weight of silicon-oxide polyether emulsion defoamer, 2 parts by weight of polyether-modified siloxane solution defoamer, 2 parts by weight of low molecular weight polycarboxylic acid polymer hydroxyl ammonium salt solution wetting dispersant and 2 parts by weight of gamma-aminopropyltrimethoxysilane), and a proper amount of water is added so that the solid content of the waterborne UV coating is 50%.
Comparative example 1
As in example 3, without adding 30 parts by weight of the aqueous aliphatic polyurethane dispersion X3, the composition of the aqueous UV coating comprised: 100 parts by weight of waterborne aliphatic polyurethane acrylate resin (Shenzhen Youyang technology GP-5132), 5 parts by weight of acrylic monomer HEMA, 4 parts by weight of photoinitiator (0.2 part by weight of IRGACURE 819 DW, 2 parts by weight of Irgacure500 and 1.8 parts by weight of TPO-L), 8 parts by weight of addition auxiliary agent (2 parts by weight of silicon-oxidized polyether emulsion defoamer, 2 parts by weight of polyether modified siloxane solution defoamer, 2 parts by weight of low molecular weight polycarboxylic acid polymer hydroxyl ammonium salt solution wetting dispersant, 2 parts by weight of silane coupling agent gamma-aminopropyltrimethoxysilane), and a proper amount of water is added to ensure that the solid content of the waterborne UV coating is 50%.
Spray curing process 1:
spraying the water-based UV coating on the substrate according to the coating weight of 80-100 g per square meter; placing the sprayed base material in a room to be dried for 2 hours, controlling the temperature in the room to be dried to be 25 ℃, and controlling the humidity to be below 30% rh; when the temperature of the drying room is raised to 35 ℃ and kept for 2 hours, the humidity is controlled below 30% rh; after the drying room is heated to 60 ℃ and kept for 15 minutes, the humidity is controlled below 30% rh; and (3) carrying out photocuring on the base material sprayed with the water-based UV coating under the condition that the humidity is controlled to be below 30% rh. The light-cured lamp tube is an LED lamp tube, the light energy of the light-cured lamp tube is 600 joules, the vertical distance between the lamp tube and the surface of the base material is controlled at 15cm, and the conveying speed of the base material is 15 m/min.
And (3) a spraying and curing process 2:
spraying the water-based UV coating on the substrate according to the coating weight of 80-100 g per square meter; placing the sprayed base material in a room to be dried for 2 hours, controlling the temperature in the room to be dried to be 25 ℃, and controlling the humidity to be below 30% rh; when the temperature of the drying room is raised to 35 ℃ and kept for 2 hours, the humidity is controlled below 30% rh; and (3) carrying out photocuring on the base material sprayed with the water-based UV coating under the condition that the humidity is controlled to be below 30% rh. The light-cured lamp tube is an LED lamp tube, the light energy of the light-cured lamp tube is 600 joules, the vertical distance between the lamp tube and the surface of the base material is controlled to be 15cm, and the conveying speed of the base material is 15 m/min.
And (3) a spraying and curing process:
spraying the water-based UV coating on the substrate according to the coating weight of 80-100 g per square meter; placing the sprayed base material in a drying room for 2 hours, wherein the temperature in the drying room is 15 ℃ and the humidity is 70% rh; heating the drying room to 35 ℃ and keeping for 2 hours; and (3) carrying out photocuring on the base material sprayed with the water-based UV coating. The light-cured lamp tube is an LED lamp tube, the light energy of the light-cured lamp tube is 600 joules, the vertical distance between the lamp tube and the surface of the base material is controlled to be 15cm, and the conveying speed of the base material is 15 m/min.
It can be seen that the aqueous UV coating of the invention has very good abrasion resistance.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the disclosure of the present invention are covered by the scope of the claims of the present invention.

Claims (7)

1. The LED light source water-based UV coating is characterized by comprising 100 parts by weight of water-based aliphatic polyurethane acrylate resin, 20-50 parts by weight of water-based aliphatic polyurethane dispersion, 1-20 parts by weight of acrylic monomer, 1-10 parts by weight of photoinitiator and 1-15 parts by weight of addition auxiliary agent, wherein the solid content of the water-based UV coating is 30-60%, and the photoinitiator is selected from two or more of Irgacure500, IRGACURE 819 DW, photoinitiator 1173, photoinitiator 184, TPO and TPO-L;
the water-based UV coating also comprises 5-30 parts by weight of hydrophobic unsaturated quaternary ammonium salt compound, wherein the structure of the hydrophobic unsaturated quaternary ammonium salt compound is as follows:
wherein R is1Is a long-chain hydrophobic group, R2Is methyl or ethyl, R3、R4Is an unsaturated bond-containing group;
the spraying and curing process of the water-based UV coating comprises the following steps:
spraying: spraying the water-based UV coating on the substrate according to the coating weight of 80-100 g per square meter;
a first dehumidification step: placing the sprayed base material in a room to be dried for 0.2-3 hours, wherein the temperature in the room to be dried is controlled at 20-28 ℃, and the humidity is controlled below 30% rh;
a second dehumidification step: when the temperature of the drying room is raised to 30-35 ℃ and kept for 0.5-3 hours, the humidity is controlled below 30% rh;
a third dehumidification step: heating the drying room to 60-70 ℃ and keeping for 5-20 minutes, and controlling the humidity below 30% rh;
and (3) curing: and (3) carrying out photocuring on the base material sprayed with the water-based UV coating under the condition that the humidity is controlled to be below 30% rh.
2. The LED light source water-based UV coating as claimed in claim 1, wherein the photoinitiator is a mixture of IRGACURE 819 DW, Irgacure500 and TPO-L, and the mass ratio of IRGACURE 819 DW, Irgacure500 and TPO-L is 1: (5-10): (5-10).
3. The LED light source water-based UV coating as claimed in claim 1, wherein the additive is one or more selected from a defoaming agent, a leveling agent, a wetting dispersant, an anti-sagging additive and an adhesion promoter.
4. The LED light source water-based UV coating as claimed in claim 3, wherein the defoaming agent is selected from one or more of a foam breaking polysiloxane solution, a polyether modified polydimethylsiloxane solution and a silicon oxidized polyether emulsion.
5. The LED light source water-based UV coating as claimed in claim 3, wherein the leveling agent is selected from one or more of a polyether modified siloxane solution, a non-ionic acrylic copolymer solution, an ionic polyacrylate solution, and a polyether modified acrylic functional group polydimethylsiloxane solution.
6. The LED light source water-based UV paint as claimed in claim 3, wherein the adhesion promoter is a silane coupling agent selected from one or more of aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane and gamma-mercaptopropyltriethoxysilane.
7. The LED light source waterborne UV coating as claimed in claim 1, wherein the light energy of the photocuring is 400-800 joules, the vertical distance between the lamp tube and the substrate surface is controlled below 20cm, the lamp tube is fixed, and the substrate conveying speed is 10-20 m/min.
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CN109354995B (en) * 2018-09-30 2020-12-29 佛山阳光逸采涂料科技有限公司 UV LED water-based ultraviolet curing home furniture coating and preparation method thereof
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