WO2016127452A1 - 电子束固化涂料、电子束固化涂层的制备方法以及应用 - Google Patents
电子束固化涂料、电子束固化涂层的制备方法以及应用 Download PDFInfo
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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Definitions
- the invention relates to the technical field of surface coatings, in particular to an electron beam curing coating, a preparation method of an electron beam curing coating and an application thereof.
- Plastics are used more and more in daily life, from household appliances, indoor and outdoor decoration, to automotive parts.
- plastics have at least two fatal weaknesses: one is that the weather resistance is not good, it is easy to decompose under the action of light and heat, reducing its service life, and some even decompose to produce toxic products and gases; the second is that plastic is relatively soft. The surface is easily scratched.
- some properties can be improved by adding a photothermal stabilizer and an anti-wear agent, other properties are inevitably damaged, and the amount of raw materials required for bulk modification is large, which increases the cost.
- the surface coating technology not only changes the appearance of the plastic, but also improves the physicochemical properties of the surface. By adding functional additives, the chemical resistance, weather resistance, scratch resistance and antibacterial properties of the plastic can be significantly improved. At the same time, since the surface coating is thin, the amount of functional materials is small, and the cost of the product is less increased.
- the coated coating can be obtained by thermal curing or radiation.
- Solvent-based and water-based coatings are generally heat-cured, but the solvent-based system has a low solid content, and a large amount of solvent is released into the air, causing environmental pollution; although the aqueous system can increase the solid content, the specific heat of water is large. The volatilization rate is slow, and a large amount of heat energy needs to be provided.
- the curing channel is generally long and the curing speed is slow.
- Radiation methods include ultraviolet light and electron beam irradiation.
- the coating method used in the radiation method can be 100% solid content, does not contain organic solvents, has no VOC, and has a fast curing speed, and is an emerging coating curing method.
- UV curing technology Due to the fast curing speed, UV curing technology has been applied on a large scale, but compared with UV curing, electron beam curing has the following advantages: high utilization of electric energy; faster curing speed; energy of electron beam Large enough to directly open the acrylate, generate free radicals, initiate polymerization, thus eliminating the need for an initiator, improving the storage stability of the coating, and reducing the color and odor caused by the by-products of photoinitiator decomposition; The penetration ability is as high as a few centimeters, and the ultraviolet light can only pass through a thickness of several tens of micrometers.
- nanofillers have been widely used. Since the nano-filler has a particle size of less than 100 nm, the nano-filler is used as a component of the coating, and the transparency of the coating is not affected by the nano-filler, while the mechanical properties of the coating such as abrasion resistance, weather resistance and chemical properties such as light resistance and chemicals Sex has been significantly improved.
- nanomaterials such as silica, titania, zinc oxide, and aluminum oxide have a large amount of hydroxyl groups on the surface, which are highly polar, and have poor compatibility with organic monomers and prepolymers, although physical methods such as sanding are used.
- Ball milling can disperse nano-fillers in organic monomers and solvents, but the stability is not good. This is because nanoparticles are easy to aggregate together to form secondary particles, which are much larger in size than primary nanoparticles and have an effect. The transparency and gloss of the coating.
- the technical problem to be solved by the present invention is to provide an electron beam curing coating and an electron beam curing coating.
- the electron beam curing coating of the present application is used for a coating material to provide a coating having good hardness and weather resistance.
- an electron beam curing coating comprising:
- the dispersion of the inorganic nanomaterial is prepared according to the following steps:
- the dispersion of the inorganic ultraviolet absorber is prepared according to the following steps:
- the inorganic nano material is one or two of silicon dioxide and aluminum oxide
- the inorganic nano-UV absorber is titanium dioxide or zinc oxide.
- the silane coupling agent is an acrylate-based silane and a halogenated alkylsilane coupling agent.
- the silica has a particle diameter of 5 to 100 nm, and the alumina has a particle diameter of 12 to 100 nm.
- the content of the dispersion of the inorganic nanomaterial is 10 to 30 parts by weight.
- the acrylate prepolymer is selected from the group consisting of aliphatic urethane acrylate, aromatic urethane acrylate, epoxy acrylate, melamine acrylate, polyester acrylate, polyether acrylate, silicone acrylate, polybutylene One or more of a diene acrylate, a polyacrylate acrylate, and an acrylate oligomer; the polyfunctional monomer is a polyfunctional acrylate.
- the electron beam curing paint further comprises a leveling lubricant, an antifoaming agent, a pigment or a nano antibacterial agent; and the pigment is contained in an amount of 0.1 to 10 parts by weight.
- the application also provides a method for preparing an electron beam cured coating, comprising the following steps:
- the preparation method of the dispersion of the inorganic nano material comprises the following steps:
- the preparation method of the dispersion of the inorganic ultraviolet absorber comprises the following steps:
- the inorganic nano material is one or two of silicon dioxide and aluminum oxide
- the inorganic nano-UV absorber is titanium dioxide or zinc oxide.
- the electron beam curing device is a low energy electron beam device, the electron beam curing dose is 5 to 100 kGy, and the electron beam curing speed is 100 to 1000 m/min.
- the electron beam cured coating has a thickness of 10 to 100 ⁇ m.
- the present application also provides an electron beam-cured coating according to the above aspect or the use of the electron beam-cured coating prepared by the above scheme on an automotive interior or decorative panel.
- the present application provides an electron beam curing coating comprising a dispersion of an inorganic nano material, a dispersion of an inorganic nano UV absorber, a polyfunctional monomer and an acrylate prepolymer, wherein the dispersion of the inorganic nano material is selected from the group consisting of One or two of a dispersion of silicon oxide and a dispersion of alumina, the dispersion of the inorganic nano-ultraviolet absorber is selected from a dispersion of titanium dioxide or a dispersion of zinc oxide; and the present application passes on silica, oxidation
- the surface modification of aluminum, titanium dioxide and zinc oxide enables uniform dispersion in the acrylate without agglomeration, which is beneficial to improve the performance of the electron beam curing coating.
- the present application is to add an inorganic nano material dispersion and an inorganic nano ultraviolet absorber.
- the dispersion makes the electron beam curing coating as a coating with good hardness and weather resistance.
- the embodiment of the invention discloses an electron beam curing coating, comprising:
- the preparation method of the dispersion of the inorganic nano material comprises the following steps:
- the preparation method of the dispersion of the inorganic ultraviolet absorber comprises the following steps:
- the inorganic nano material is one or two of silicon dioxide and aluminum oxide
- the inorganic nano-UV absorber is titanium dioxide or zinc oxide.
- the present application provides an electron beam curing coating comprising a dispersion of an inorganic nano material, a dispersion of an inorganic ultraviolet absorber, a polyfunctional monomer and an acrylate prepolymer; and the inorganic nanoparticle
- the material and the inorganic ultraviolet absorber are uniformly dispersed in the acrylate monomer respectively, and no agglomeration occurs, thereby avoiding the influence on the coating performance, and the coating has good wear resistance and weather resistance.
- the dispersion of the inorganic nano material is one or both of a dispersion of silica and a dispersion of alumina.
- the electron beam curing coating described in the present application adds a dispersion of silica, so that the electron beam curing coating as a material of the electron beam curing coating gives the coating a good hardness; and the dispersion of the added alumina also makes the coating It has high hardness; the dispersion of silica and alumina dispersed in the electron beam curing coating will make the protective coating have better hardness and better wear resistance.
- the surface of silica and alumina has a large amount of hydroxyl groups, has a large polarity, and has poor compatibility with organic monomers and prepolymers. Therefore, it is necessary to disperse silica and alumina in organic monomers and solvents, respectively.
- the nanoparticles of silica and alumina are easily aggregated to form secondary particles, which affect the properties of the coating.
- the present application provides an inorganic nanomaterial preparation.
- the inorganic nanomaterial is one or both of silica and alumina.
- the preparation method of the inorganic nano material comprises the following steps:
- the present application treats the surface of silica and alumina to be uniformly dispersed in the organic monomer to form a stable transparent or translucent dispersion; thus, silica or The dispersion of alumina serves as a component of the electron beam-curing coating to give it better performance.
- the inorganic nanomaterials described in the present application are silica and alumina, and the solution of the inorganic nanomaterial is first mixed with an organic solvent to obtain a mixed solution.
- the solution of the inorganic nanomaterial is preferably a hydrosol in which inorganic nanomaterials are dispersed in water, such as silica gel and aluminum sol. Nano-silica particles are easily dispersed in water to form a stable dispersion due to electrostatic repulsion.
- silica hydrosol, or silica gel has been used as a very economical green raw material.
- the size of the silica gel is mainly 5 nm, 7 nm, 12 nm, 20 nm and 50 nm, and the pH is preferably 2 to 12.
- silica gels are as follows: Ludox (DuPont), NexSil (NYACOL Technologies, Inc.), CAB-O-SPERSE (CABOT Corporation), Bindzil and Levasil (AkzoNobel), AERODISP (EVONIK Industries), HTSi-11L (Nanjing) Haitai Nano Co., Ltd., VK-S series (Hangzhou Wanjing New Materials Co., Ltd.), but not limited to these.
- the aluminum sol may be a dispersion of alumina or an alumina modified silica gel, such as aluminum sol (Shandong Shanda Colloid Materials Co., Ltd.), XZ-1128 (Hefei Xiangzheng Chemical Technology Co., Ltd.), A-10 (Dalian Snow Chemical New Materials Science and Technology Co., Ltd.), VK-L30W (Hangzhou Wanjing New Materials Co., Ltd.), NanoPhase's Al-2255 and so on.
- Nano-silica has small particle size and large surface area, so there are a large number of hydroxyl groups on the surface, and its hydroxyl density is about 4.6/nm 2 .
- the silanol can lose hydrogen ions at pH 2 or higher, producing silicon-oxygen anion, which is easy to A stable dispersion is obtained in the water.
- the silica particles are easily agglomerated to form large aggregates, which precipitate and fail to form a stable dispersion. Therefore, the present application uses a silane coupling agent to treat the surface of the silica, reduce the concentration of the hydroxyl group, and reduce the polarity to increase the affinity with the organic solvent and the monomer.
- the organic solvent includes one or more of a low boiling point alcohol, an ether and a ketone, wherein the alcohol is one or more of methanol, ethanol, isopropanol and butanol; Tetrahydrofuran, 1,4-dioxane, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl
- One or more of ether and propylene glycol monobutyl ether; one or two of ketones such as acetone and methyl ethyl ketone, and other solvents include acetonitrile and dimethylformamide.
- the amount of the above organic solvent to be added is preferably from 50% to 500% by weight based on the weight of the silica gel, and more preferably from 50% to 300% by weight.
- the reaction of silane is greatly affected by pH and temperature. Under acidic conditions, it is easy to hydrolyze to produce silanol groups, and under alkaline conditions, condensation reaction is easy to occur. Under neutral conditions, hydrolysis and condensation reactions are slow; It facilitates the progress of hydrolysis and condensation reactions. Therefore, the present application adjusts the pH of the above mixed solution, and the pH value may be one or more of an acid such as formic acid, acetic acid, hydrochloric acid and nitric acid or a base such as ammonia, sodium hydroxide and potassium hydroxide. To adjust, the pH is preferably from 2 to 6.
- the application then reacts the pH adjusted solution with an acrylate monomer and a silane coupling agent, and the hydrolyzed silane coupling agent reacts with the surface of the inorganic nanoparticle silica to increase the oil solubility of the silica, and then It is dissolved in an acrylate monomer to obtain a dispersion of an inorganic nanomaterial.
- the reaction temperature is preferably from 30 ° C to 100 ° C, more preferably from 50 ° C to 80 ° C; and the reaction time is preferably from 1 h to 24 h, more preferably from 2 h to 12 h, and most preferably from 2 h to 6 h.
- the silane coupling agent described in the present application preferably contains a group capable of generating a radical by electron beam irradiation or a group which causes radical crosslinking, and the above group includes (meth) acrylate, (meth) acrylamide, ethylene.
- the silane coupling agent of the present application is preferably a silane coupling agent containing a halogenated alkyl group, a base group, an amino group, an epoxy group, a mercapto group or a halogenated alkyl group.
- the mass ratio of the silane coupling agent to silica is preferably from 1:100 to 10:1, more preferably from 5:100 to 5:1, and most preferably from 1:10 to 1:1.
- the amount of the silane coupling agent is related to the particle size or specific surface area of the silica. The smaller the particles, the larger the amount of the silane coupling agent required, and vice versa.
- the acrylate monomer is used in an amount of from 0.5 to 10 times, preferably from 1 to 8 times, more preferably from 2 to 5 times the weight of the silica.
- the silane coupling agent which can participate in the crosslinking reaction contains a (meth) acrylate group, a (meth) acrylamide group, a vinyl group, an amino group, and an epoxy group.
- the (meth) acrylate group-containing silane is preferably ⁇ -(meth)acryloyloxypropyltrimethoxysilane or ⁇ -(meth)acryloyloxypropyltriethoxysilane.
- ⁇ -(meth)acryloyloxypropyltriisopropoxysilane ⁇ -(meth)acryloyloxypropylmethyldimethoxysilane, ⁇ -(meth)acryloyloxypropane Of methyldiethoxysilane, ⁇ -(meth)acryloxypropyldimethylmethoxysilane and ⁇ -(meth)acryloxypropyldimethylethoxysilane One or more.
- Such silanes are preferably (meth)acrylamidopropyltrimethoxysilane, (meth)acrylamidopropyltriethoxysilane, (meth)acrylamidopropyltriisopropoxysilane, (methyl) Acrylamide propylmethyldimethoxysilane, (meth)acrylamidopropylmethyldiethoxysilane, (meth)acrylamidopropyldimethylmethoxysilane, (meth)propylene Amidopropyldimethylethoxysilane, (meth)acrylamide (2-methyl)propyltrimethoxysilane, (meth)acrylamide (2-methyl)ethyltrimethoxysilane, ( Methyl)acrylamide (2-methyl)propyltriethoxysilane, (meth)acrylamide (2-methyl)ethyltriethoxysilane, N-[2-(meth)acrylamide Ethyl]aminopropy
- the vinyl group-containing silane is preferably vinyl trimethoxysilane, vinyl triethoxysilane, vinyl triisopropoxysilane, vinyl triptoxysilane, vinyl tris ( ⁇ -methoxy B) Oxy)silane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, vinyldimethylmethoxysilane, vinyldimethylethoxysilane, vinyltriacetoxy One or more of a silane, a divinyltetramethyldisiloxane, and a tetravinyltetramethylcyclotetrasiloxanekind.
- the epoxy group-containing silane is preferably 3-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltriethoxysilane, 3- (2,3-epoxypropoxy)propyltriisopropoxysilane, 3-(2,3-epoxypropoxy)propylmethyldimethoxysilane, 3-(2,3-epoxy Propoxy)propylmethyldiethoxysilane, 3-(2,3-epoxypropoxy)propyldimethylmethoxysilane, 3-(2,3-epoxypropoxy)propyl One of methyl monooxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane or A variety.
- Silane ⁇ -aminopropyldimethylmethoxysilane, ⁇ -aminopropyldimethylethoxysilane, N-methyl- ⁇ -aminopropyltrimethoxysilane, N-methyl- ⁇ -Aminopropyltriethoxysilane, N-anilinopropyltrimethoxysilane, N-anilinopropyltriethoxysilane, N- ⁇ -(aminoethyl)- ⁇ -aminopropyltrimethoxysilane , N-( ⁇ -aminoethyl)- ⁇ -aminopropyltriethoxysilane, N- ⁇ -(aminoethyl)- ⁇ -aminopropylmethyldimethoxysilane and N- ⁇ -( One or more of aminoethyl)- ⁇ -aminopropylmethyldiethoxysilane.
- a silane which easily generates a radical under the action of an electron beam can be represented by the structural formula XR 9 SiR 11 p (OR 12 ) 3-p wherein p is 0 to 2 and R 9 is an alkyl group having 1 to 5 carbon chains, R 11 and R 12 are alkane having 1 to 3 carbon chains, which may be the same or different, and X is Cl, Br, I or SH or the like.
- Such silanes are preferably 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropylmethyldiethoxylate Silane, 3-mercaptodimethyl methoxysilane, 3-mercaptopropyldimethylethoxysilane, 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 3 -Chloropropylmethyldimethoxysilane, 3-chloropropylmethyldiethoxysilane, 3-chloropropyldimethylmethoxysilane, 3-chloropropyldimethylethoxysilane , 3-bromopropyltrimethoxysilane, 3-bromopropyltriethoxysilane, 3-bromopropyltriethoxysilane, 3-bromopropylmethyldimethoxy
- the present application preferably employs a halogen-containing silane coupling agent-modified silica which is capable of generating free radicals at a lower electron beam radiant energy to rapidly cure the coating.
- the acrylate monomer described in the present application may be a monofunctional monomer, may be a bifunctional monomer, or may be a polyfunctional monomer, and is not particularly limited herein.
- the monofunctional monomer is preferably hydroxyethyl acrylate, hydroxypropyl acrylate, isooctyl acrylate, dodecyl acrylate, tetradecyl acrylate, octadecyl acrylate, isobornyl acrylate, acrylic acid Caprolactone, 2-methoxyethyl acrylate, 2-butoxyethyl acrylate, 2-dimethylaminoethyl acrylate, 2-diisopropylaminoethyl acrylate, methacrylic acid Ester phosphate, ethoxyethoxyethyl acrylate, tetrahydrofuran methanol acrylate, phenoxyethyl acrylate, hexanediol me
- the difunctional acrylate monomer is preferably 1,3-propanediol diacrylate, 1, 4-butanediol diacrylate, 1, 6-hexanediol diacrylate, ethylene glycol diacrylate, diethyl Diol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate (different molecular weight), dipropylene glycol diacrylate, triglycerol diacrylate, neopentyl glycol diacrylate Ester, ethoxy neopentyl glycol diacrylate, propoxy neopentyl glycol diacrylate, cyclohexane dimethanol diacrylate, ethoxylated bisphenol A diacrylate, zinc diacrylate and o-benzene One or more of diethanol diacetate diacrylate.
- the polyfunctional acrylate monomer is preferably trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, glycerol triacrylate, Ethoxylated glycerol triacrylate, propoxylated glycerin triacrylate, trimethylolpropane tetraacrylate, ethoxylated pentaerythritol tripropenyl ester, propoxylated pentaerythritol tripropenyl ester, three One of 2-hydroxyethyl isocyanurate triacrylate, pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetrapropanol ester, propoxylated pentaerythritol tetrapropanol ester and dipentaerythritol monohydroxypentaacrylatekind or more.
- the methacrylate compound of the above monomer is also suitable.
- the invention also provides a preparation method of the dispersion of the alumina, the preparation process and the raw materials used are the same as the silica, and no further description is given here.
- the present application also provides a method for preparing a dispersion of a UV absorber, that is, a dispersion of titanium dioxide and a dispersion of zinc oxide.
- the present application disperses nano titanium dioxide or zinc oxide separately In the monomer, a stable transparent or translucent dispersion is formed.
- Nano-TiO2 and zinc oxide are good visible-light transparent inorganic UV absorbers, but they have photocatalytic properties and are easy to decompose organic matter.
- the application of the silane coupling agent to treat titanium dioxide and zinc oxide on the one hand increases their compatibility with the monomer, and on the other hand, the surface of the nano titanium dioxide and zinc oxide particles is coated with an inorganic silicon dioxide layer. Reduce its photocatalytic performance.
- the inorganic ultraviolet absorber titanium dioxide and zinc oxide dispersion the raw material is a solution of titanium dioxide and zinc oxide, which may be a solution of titanium dioxide and zinc oxide in an organic solvent such as an alcohol, or may be aqueous,
- the application is preferably an aqueous solution of titanium dioxide and an aqueous solution of zinc oxide.
- the preparation process of the dispersion of the titanium dioxide dispersion and the zinc oxide described in the present application is the same as the preparation method of the dispersion of the inorganic nano material, and will not be described herein.
- the dispersion of the inorganic nanomaterial dispersion and the inorganic ultraviolet absorbent is prepared, it is used as a component of an electron beam curing coating.
- the electron beam curing coating provided by the present application includes a dispersion of an inorganic nano material, a dispersion of an inorganic ultraviolet absorber, a polyfunctional monomer and an acrylate prepolymer; and the inorganic nano material and the inorganic ultraviolet absorber in the above components
- the miscibility of the functional group monomer and the acrylate prepolymer is not good, so it is necessary to first modify the silane coupling agent to increase the affinity between them.
- Inorganic nanomaterials and inorganic ultraviolet absorbers have poor film forming properties or are not completely formed into films. Therefore, it is necessary to use a polyfunctional monomer and an acrylate prepolymer as a matrix material for film formation, and thus the electron beam curing coating described in the present application
- the components are complementary and synergistic.
- the inorganic nanomaterial silica can increase the hardness of the coating as an electron beam curing coating, but the amount required is large. If a small amount of alumina is added, the hardness of the coating can be improved, and the wear resistance of the coating can be remarkably improved. However, silica and alumina do not improve the weatherability of the coating.
- the addition of a small amount of titanium dioxide or zinc oxide can selectively absorb and filter out the ultraviolet light harmful to the coating in sunlight, and increase the weather resistance of the coating. .
- the use of titanium dioxide and zinc oxide alone does not improve the hardness and wear resistance of the coating.
- the inorganic nano material of the present application is selected from one or two of silica and alumina, and the inorganic ultraviolet absorber is selected from titanium dioxide or zinc oxide to form a coating formed by the electron beam curing coating.
- Good hardness and weather resistance Preferably, the present application preferably selects three inorganic materials among the silica, alumina, titania and zinc oxide as components of the electron beam-curing coating.
- the best performance of the electron beam curing coating is:
- the electron beam curing coating includes a dispersion of silica, a dispersion of alumina, and a dispersion of a dispersion of titanium dioxide and zinc oxide, so that the coating has good hardness, wear resistance and weather resistance at the same time. .
- the role of the acrylate prepolymer in the overall coating is important, and the selection of a suitable prepolymer can improve the toughness, abrasion resistance and weatherability of the coating.
- the acrylate prepolymer contains a plurality of (meth) acrylate functional groups, mainly including fat and aromatic urethane acrylate, epoxy acrylate, melamine acrylate, polyester acrylate, polyether acrylate, silicone acrylic acid One or more of ester, polybutadiene acrylate, polyacrylate acrylate, and acrylate oligomer; aliphatic urethane acrylate, polyether acrylate, and polyacrylate acrylate are preferred because of Contains no aromatic groups and has good weatherability.
- the acrylate prepolymer preferably contains three or more functional groups to increase the crosslinking density after curing.
- aliphatic urethane acrylates include ETECCRYL of Cytec, such as 264, 4866, 8210, 8301, 8402, 8411; Sartomer's CN9006NS, CN9010NS, CN9013NS, CN9110NS, CN970A60NS, CN971A80NS, CN975NS, CN989NS, etc.; Dymax Oligomers & Coatings BR -144,BR-302,BR-582E8,BR-582H15,BRC-443,BRC-841,BRC-843,BRC-970BT,BRC-990, etc., Changqing Company's 6103,6130B-80,6134B-80, 6145-100,6150-100,6158B-80,6170,6195-100,6196-100,6197,5105A,DR-U011,DR
- the molecular weight of the acrylate prepolymer is preferably from 1,000 to 10,000, more preferably from 1,000 to 5,000, most preferably from 1,000 to 3,000.
- the content of the acrylate prepolymer is preferably from 10 parts by weight to 80 parts by weight, more preferably from 10 parts by weight to 60 parts by weight, most preferably from 20 parts by weight to 50 parts by weight.
- the polyfunctional monomer described in the present application is preferably one or more of the above polyfunctional acrylates, and the polyfunctional monomer is contained in an amount of 2 to 30 parts by weight, preferably 5 to 20 parts by weight.
- the electron beam-curable coatings described in the present application also include other additives such as leveling agents, antifoaming agents and pigments, which can be added to the formulation to improve problems during the coating process, such as increasing the wetting property to the surface and reducing the bubbles. Produce, increase decorativeity, etc.
- Leveling wetting agents include BYK-UV 3500, BYK-UV 3535, BYK-377, EVONIK INDUSTRIES from BYK RAD2010, RAD 2011, RAD 2100, RAD 2250, RAD 2300, RAD 2500, RAD 2600, RAD 2700, Wet 270, Dow Corning 28, 57, 67, 730, 930, 8211, XIAMETER OFX series by Dow Corning.
- the antifoaming agent includes BYK-067A, BYK-088, BYK-1790, BYK-1791, BYK-A 535, EVONIK INDUSTRIES of BYK Company Airex 900, Airex 920, Airex950, Airex 962, Airex 990, Silok 4010, 4012, 4020, 4050, 4070, 4500, 4920, etc. of Guangzhou Snooker Chemical Co., Ltd., 54, 710, 810, 910, 1500, etc. of Dow Corning.
- a pigment may be added to the electron beam-curable coating to change the color of the coating to increase its decorative properties without affecting its curing performance.
- the pigment is preferably from 0.1 part by weight to 10 parts by weight, more preferably from 0.2 part by weight to 5 parts by weight. Most preferably, it is 1 part by weight to 3 parts by weight.
- the pigments include carbon black, cobalt blue, iron oxide red, iron oxide yellow, nickel titanium yellow, and organic pigments.
- the present application provides an electron beam curing coating comprising a dispersion of an inorganic nano material, a dispersion of an inorganic nano UV absorber, a polyfunctional monomer and an acrylate prepolymer, wherein the dispersion of the inorganic nano material is selected from the group consisting of One or two of a dispersion of silicon oxide and a dispersion of alumina, the dispersion of the inorganic nano-ultraviolet absorber is selected from a dispersion of titanium dioxide or a dispersion of zinc oxide; and the present application passes on silica, oxidation
- the surface modification of aluminum, titanium dioxide and zinc oxide enables uniform dispersion in the acrylate without agglomeration, which is beneficial to improve the performance of the electron beam curing coating.
- the inorganic nano-material dispersion and the inorganic nano-ultraviolet absorber dispersion are added to make the electron beam-curable coating as a coating having good hardness and weather resistance.
- the application also provides a method for preparing a protective coating, comprising the following steps:
- the preparation method of the dispersion of the inorganic nano material comprises the following steps:
- the preparation method of the dispersion of the inorganic ultraviolet absorber comprises the following steps:
- the inorganic nano material is silica or alumina
- the inorganic nano-UV absorber is titanium dioxide or zinc oxide.
- the present application also provides a preparation method of the protective coating.
- the present application firstly disperses the inorganic nano material, the dispersion of the inorganic nano ultraviolet absorber, the polyfunctional monomer and the acrylate.
- the prepolymer is mixed to obtain a coating, and the coating is applied to a base layer, followed by electron beam curing to obtain an electron beam cured coating.
- the preparation process of the dispersion liquid of the inorganic nano material and the dispersion of the inorganic ultraviolet absorber is as described above, and will not be described herein.
- the above coating methods are well known to those skilled in the art, such as brushing, rolling, spraying, and curtain coating, and the present application is not particularly limited.
- the coating is irradiated with an electron beam to obtain a cured film.
- the electron beam curing device is selected to be capable of emitting a high energy, medium energy or low energy electron beam, preferably a low energy electron beam, and the acceleration voltage is preferably 50 to 250 kV.
- the irradiation chamber is protected with a degassing gas such as nitrogen or argon to make the concentration of oxygen less than 500 mg/L, preferably less than 300 mg/L.
- the curing dose is preferably from 5 to 100 kGy, more preferably from 10 to 80 kGy, most preferably from 10 to 50 kGy; the curing rate is preferably from 100 to 1000 m/min, most preferably from 300 to 1000 m/min, most preferably from 500 to 1000. m/min.
- the thickness of the obtained electron beam cured film is preferably from 1 ⁇ m to 2 mm, preferably from 10 ⁇ m to 1 mm, and most preferably from 10 ⁇ m to 100 ⁇ m.
- the invention also provides for the use of the electron beam cured coating on automotive interior or decorative panels.
- the decorative board may be a plastic material
- the plastic material may be a pure polymer material or may be blended with an inorganic filler, and may be a film or a sheet material.
- plastic materials include polyolefin, polystyrene, expanded polystyrene, impact polystyrene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyester, polyamide (nylon 6, nylon) 66, etc.), polyvinyl chloride, polyurethane, polycarbonate, polymethyl methacrylate, polytetrafluoroethylene, polyvinylidene fluoride, polyoxymethylene, polyetheretherketone, polyether, polyimide, polyether amide Imine, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, cellulose acetate, starch, chitin, gelatin, polylactic acid, polyhydroxyalkanoate, polycaprolactone, poly(
- the present invention is preferably a commonly used plastic such as polyvinyl chloride, polypropylene, polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer, and polylactic acid, polyhydroxyalkanoate, polycaprolactone, poly( Biodegradable plastics such as DL-lactide-co-glycolide, polypropylene carbonate, and cyclohexene carbonate.
- a commonly used plastic such as polyvinyl chloride, polypropylene, polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer, and polylactic acid, polyhydroxyalkanoate, polycaprolactone, poly( Biodegradable plastics such as DL-lactide-co-glycolide, polypropylene carbonate, and cyclohexene carbonate.
- the present application detects the performance of an electron beam cured coating, and the hardness, abrasion resistance and weather resistance of the cured coating can be detected by standard methods.
- the hardness of the paint film can be measured by referring to the standard ASTM D3363-74.
- the coated panel is placed on a fixed horizontal surface.
- the pencil is at 45° to the layer and pushed forward by 10 mm at a speed of 5-10 cm/sec.
- the surface of the sample was visually observed to be scratched.
- the pencil hardness test pen can be from 1H to 9H. The larger the value, the higher the hardness.
- the affinity of the paint film and the bottom plate can be referred to the national standard GB/T 9286-1998 paint film cross-cut test rating method.
- Cut and cut 6 parallel cutting lines vertically and horizontally on the prepared test plate with the cutting tool (the spacing is determined by the coating thickness and the hardness of the substrate, ranging from 1 to 3 mm), and the coating is cut with a transparent tape. Evenly peel off the tape, check the cutting surface with a 4x magnifying glass, 0 is the best adhesion, the cutting edge is completely smooth, no one is off; 1 level has a little coating off at the intersection of the incision, but the cross-cut area is affected Can not be greater than 5%; more than 2, can not meet the requirements.
- the abrasion resistance was measured by a Taber abrasion machine in accordance with the ASTM 4060 standard.
- the test sample has a diameter of 10 cm, the grinding wheel model is Calibrase cs-10, the load weight is 1 kg, and the wear cycle is 2000.
- the weight of the test sample before and after the abrasion was recorded, and the weight loss was expressed in milligrams.
- Weatherability is carried out using an accelerated aging test chamber QUV.
- the QUV tester's UVA-340 lamp provides the best solar light spectrum with a critical short wavelength range from 365 nanometers to 295 nanometers at the sun cutoff wavelength.
- the maximum irradiance at 340 nm was 0.68 W/cm 2 and the test temperature was 50 degrees, provided that it was 8 hours light and then condensed for 4 hours.
- the full set of tests lasted 1920 hours (80 days).
- the change of the surface color of the sample after the test is expressed by CIE L*a*b* color space, the L* value indicates the brightness of the color, the a* value indicates the green red value of the color, the b* value indicates the blue-yellow value of the color, and the color difference is expressed by the formula.
- Nexsil 12 is a dispersion of silica in water at a concentration of 30%, particles of 12 nm, and a pH of 9.3, which is produced by Nyacol Nano Technologies, Inc.
- Al-2255 is a 20 nm dispersion of alumina in water at a concentration of 30% produced by Nanophase Technologies.
- VK-T32 is a dispersion of anatase titanium dioxide produced by Hangzhou Wanjing New Material Co., Ltd. in water at a concentration of 20% and a particle size of 10 nm.
- NanoBYK-3840 is a dispersion of zinc oxide in water produced by Altana with a zinc oxide content of 40% and a particle size of 20 nm.
- organosilanes ⁇ -(meth)acryloyloxypropyltriethoxysilane, vinyltriethoxysilane and 3-chloropropyltriethoxysilane were obtained from Gelest.
- the polyfunctional monomer pentaerythritol triacrylate (PETA) and 1,6-hexanediol diacrylate (HDDA) were obtained from Sartomer.
- Polyvinyl chloride and polypropylene sheets are produced by Foshan Tianan Plastic Co., Ltd.
- VK-T32 (containing anatase titanium dioxide 20%, 10 nm) was added to 600g of ethanol, the pH was adjusted to 3-4 with hydrochloric acid, then 120g of pentaerythritol triacrylate (PETA) was added, and finally 15g of ⁇ -(meth) propylene was added.
- PETA pentaerythritol triacrylate
- ⁇ -(meth) propylene 15g
- Acyloxypropyltriethoxysilane and 15g 3-chloropropyltriethoxysilane the mixed solution was heated to 60 ° C and stirred for 6 h, the solvent ethanol and water were removed by vacuum using a rotary evaporator, the temperature was not Above 60 ° C, a viscous translucent dispersion of titanium dioxide in PETA is obtained.
- NanoBYK-3840 (containing 40% zinc oxide, 20 nm) was added with 150 g of water and 600 g of ethanol, the pH was adjusted to 3-4 with hydrochloric acid, then 120 g of pentaerythritol triacrylate (PETA) was added, and finally 15 g of ⁇ -(methyl) was added.
- PETA pentaerythritol triacrylate
- Acryloyloxypropyltriethoxysilane and 15 g of 3-chloropropyltriethoxysilane the mixed solution was heated to 60 ° C and kept under stirring for 6 h, and the solvent ethanol and water were removed by vacuum using a rotary evaporator. Not more than 60 ° C, a viscous translucent dispersion of zinc oxide in PETA is obtained.
- VK-T32 containing anatase titanium dioxide 20%, 10 nanometers
- NanoBYK-3840 (containing 40% zinc oxide, 20 nm) was added to 150 g of water and 600 g of ethanol, the pH was adjusted to 3-4 with hydrochloric acid, then 120 g of pentaerythritol triacrylate (PETA) was added, and finally 30 g of 3-chloropropyl group was added.
- PETA pentaerythritol triacrylate
- Triethoxysilane the mixed solution is heated to 60 ° C and stirred for 6 h, the solvent ethanol and water are removed under vacuum by a rotary evaporator at a temperature not exceeding 60 ° C to obtain a viscous translucent dispersion of zinc oxide in PETA. .
- the urethane acrylate prepolymer is dissolved in 1,6-hexanediol diacrylate, then an appropriate amount of silica monomer dispersion is added, and finally, an appropriate amount of leveling agent is added.
- RAD 2500 and defoamer The total amount of Airex 900, leveling agent and antifoaming agent was 1%, and the resulting coating was applied by roll coating on untreated polyvinyl chloride or corona treated polypropylene sheets to form a coating of about 10 microns.
- the coating was cured in an electron beam irradiation chamber under nitrogen protection with an irradiation voltage of 150 kV and an irradiation dose of 40 KGy.
- the adhesion of the coating to the board is 0 to 1 grade.
- the addition of silica does not affect the transparency of the coating, but it can significantly increase the hardness of the coating.
- the urethane acrylate prepolymer 6195-100 is dissolved in 1,6-hexanediol diacrylate, and then an appropriate amount of a monomer dispersion of silica is added, and finally, an appropriate amount is added.
- Leveling agent RAD 2500 and defoamer The total amount of Airex 900, leveling agent and antifoaming agent was 1%, and the resulting coating was applied by roll coating on untreated polyvinyl chloride or corona treated polypropylene sheets to form a coating of about 10 microns.
- the coating is cured in an electron beam irradiation chamber under nitrogen protection, the irradiation voltage is 150KV, the irradiation dose is the minimum dose required when the coating reaches 5H, and the adhesion of the coating to the sheet is 0 to 1.
- the urethane acrylate prepolymer 6195-100 was dissolved in 1,6-hexanediol diacrylate, and then the monomer dispersion of the silica of Example 3 was added and examples. 4 alumina, and finally add the right amount of leveling agent RAD 2500 and defoamer
- the total amount of Airex 900, leveling agent and antifoaming agent was 1%, and the resulting coating was applied by roll coating on untreated polyvinyl chloride or corona treated polypropylene sheets to form a coating of about 10 microns.
- the coating is cured in an electron beam irradiation chamber under nitrogen protection, the irradiation voltage is 150KV, the irradiation dose is 25KGy, and the adhesion of the coating to the sheet is 0 to 1.
- the urethane acrylate prepolymer 6195-100 was dissolved in 1,6-hexanediol diacrylate according to the formulation of Table 4, and then the monomer dispersion of the silica synthesized in Example 8 was added. , the dispersion of the alumina synthesized in Example 9 and the titanium dioxide or zinc oxide of Example 10 or 11, and finally adding an appropriate amount of leveling agent RAD 2500 and defoamer The total amount of Airex 900, leveling agent and antifoaming agent was 1%, and the resulting coating was applied by roll coating on untreated polyvinyl chloride or corona treated polypropylene sheets to form a coating of about 10 microns. ,
- the coating is cured in an electron beam irradiation chamber under nitrogen protection.
- the irradiation voltage is 150KV
- the irradiation dose is 25KGy
- the adhesion between the coating and the sheet is 0 to 1.
- the addition of titanium dioxide or zinc oxide does not affect the radiation. Take the dose.
- the urethane acrylate prepolymer 6195-100 was dissolved in 1,6-hexanediol diacrylate, and then the monomer dispersion of the silica synthesized in Example 8 was added or Example 9 A monomer dispersion of the synthesized alumina, a titanium oxide synthesized in Example 10 or a dispersion of zinc oxide of Example 11, and finally an appropriate amount of a leveling agent is added.
- RAD 2500 and defoamer The total amount of Airex 900, leveling agent and antifoaming agent was 1%, and the resulting coating was applied by roll coating on untreated polyvinyl chloride or corona treated polypropylene sheets to form a coating of about 20 microns.
- the coating is cured in an electron beam irradiation chamber under nitrogen protection.
- the irradiation voltage is 150KV
- the irradiation dose is 25KGy
- the adhesion between the coating and the sheet is 0 to 1.
- the addition of titanium dioxide or zinc oxide does not affect. Irradiation dose.
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Abstract
Description
Claims (10)
- 如权利要求1所述的电子束固化涂料,其特征在于,所述硅烷偶联剂为丙烯酸酯基硅烷和卤代烷基硅烷偶联剂。
- 如权利要求1所述的电子束固化涂料,其特征在于,所述二氧化硅粒径为5~100nm,所述氧化铝的粒径为12~100nm。
- 如权利要求1所述的电子束固化涂料,其特征在于,所述无机纳米材料的分散液的含量为10~30重量份。
- 如权利要求1所述的电子束固化涂料,其特征在于,所述丙烯酸酯预聚体选自脂肪族聚氨酯丙烯酸酯、芳香族聚氨酯丙烯酸酯、环氧丙烯酸酯、三聚氰胺丙烯酸酯、聚酯丙烯酸酯、聚醚丙烯酸酯、有机硅丙烯酸酯、聚丁二烯丙烯酸酯、聚丙烯酸酯丙烯酸酯和丙烯酸酯齐聚物中的一种 或多种;所述多官能团单体为多官能团丙烯酸酯。
- 如权利要求1所述的电子束固化涂料,其特征在于,所述电子束固化涂料中还包括流平润滑剂、消泡剂、颜料或纳米抗菌剂;所述颜料的含量为0.1~10重量份。
- 一种电子束固化涂层的制备方法,包括以下步骤:将5~50重量份的无机纳米材料的分散液、1~10重量份的无机纳米紫外吸收剂的分散液、2~30重量份的多官能团单体、10~80重量份的丙烯酸酯预聚体混合,得到涂料;将所述涂料涂布于基材上,然后进行电子束固化,得到电子束固化涂层;所述无机纳米材料的分散液的制备方法,包括以下步骤:A)将无机纳米材料的溶液与有机溶剂混合,得到混合溶液,调节所述混合溶液的pH值;B)将步骤A)得到的溶液、丙烯酸酯单体与硅烷偶联剂反应,得到无机纳米材料的分散液;所述无机紫外吸收剂的分散液的制备方法,包括以下步骤:A)将无机纳米紫外吸收剂的溶液与有机溶剂混合,得到混合溶液,调节所述混合溶液的pH值;B)将步骤A)得到的溶液、丙烯酸酯单体与硅烷偶联剂反应,得到无机纳米紫外吸收剂的分散液;所述无机纳米材料为二氧化硅与氧化铝中的一种或两种;所述无机纳米紫外吸收剂为二氧化钛或氧化锌。
- 如权利要求7所述的制备方法,其特征在于,所述电子束固化的设备为低能电子束设备,所述电子束固化的剂量为5~100kGy,所述电子束固化的速度为100~1000m/min。
- 如权利要求7所述的制备方法,其特征在于,所述电子束固化涂层的厚度为10~100μm。
- 权利要求1~6任一项所述的电子束固化涂料或权利要求7~9任一项所制备的电子束固化涂层在汽车内饰或装饰板材上的应用。
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