CN117903683A - Soft light water-based light-cured coating and preparation method thereof - Google Patents
Soft light water-based light-cured coating and preparation method thereof Download PDFInfo
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- CN117903683A CN117903683A CN202410073702.6A CN202410073702A CN117903683A CN 117903683 A CN117903683 A CN 117903683A CN 202410073702 A CN202410073702 A CN 202410073702A CN 117903683 A CN117903683 A CN 117903683A
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- silicon dioxide
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- water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000000576 coating method Methods 0.000 title claims abstract description 46
- 239000011248 coating agent Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 112
- 239000000839 emulsion Substances 0.000 claims abstract description 44
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 41
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 41
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 34
- 239000008213 purified water Substances 0.000 claims abstract description 23
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims abstract description 19
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 19
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims abstract description 19
- -1 acrylic ester Chemical class 0.000 claims abstract description 15
- 229920002635 polyurethane Polymers 0.000 claims abstract description 14
- 239000004814 polyurethane Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000013530 defoamer Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 9
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 9
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 125000003700 epoxy group Chemical group 0.000 claims abstract description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 75
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 38
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 21
- 239000007864 aqueous solution Substances 0.000 claims description 20
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 19
- 150000001875 compounds Chemical class 0.000 claims description 19
- 239000003995 emulsifying agent Substances 0.000 claims description 19
- 239000000377 silicon dioxide Substances 0.000 claims description 17
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- AIPCSKRJJOUNEM-UHFFFAOYSA-N 3,5-ditert-butyl-4-hydroxybenzoyl chloride Chemical compound CC(C)(C)C1=CC(C(Cl)=O)=CC(C(C)(C)C)=C1O AIPCSKRJJOUNEM-UHFFFAOYSA-N 0.000 claims description 12
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000003760 magnetic stirring Methods 0.000 claims description 10
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 claims description 10
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 10
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 9
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 8
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 8
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- FCIIEZYZYBGUBJ-UHFFFAOYSA-N 2-ethyl-1-propyl-1-trimethoxysilylhydrazine Chemical compound CCNN(CCC)[Si](OC)(OC)OC FCIIEZYZYBGUBJ-UHFFFAOYSA-N 0.000 claims description 7
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 7
- 238000004945 emulsification Methods 0.000 claims description 7
- YEXOWHQZWLCHHD-UHFFFAOYSA-N 3,5-ditert-butyl-4-hydroxybenzoic acid Chemical compound CC(C)(C)C1=CC(C(O)=O)=CC(C(C)(C)C)=C1O YEXOWHQZWLCHHD-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000012295 chemical reaction liquid Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000002390 rotary evaporation Methods 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000012965 benzophenone Substances 0.000 claims description 3
- 230000001804 emulsifying effect Effects 0.000 claims description 3
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 claims description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 claims description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 2
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 claims description 2
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 2
- 239000008234 soft water Substances 0.000 claims 3
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 abstract description 10
- 239000000853 adhesive Substances 0.000 abstract description 7
- 238000000016 photochemical curing Methods 0.000 abstract description 7
- 239000006087 Silane Coupling Agent Substances 0.000 abstract description 4
- 239000003292 glue Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000000704 physical effect Effects 0.000 abstract description 3
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 2
- 239000002313 adhesive film Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000178 monomer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000005028 tinplate Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N acetone Substances CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000001263 acyl chlorides Chemical group 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical compound [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 125000005580 triphenylene group Chemical group 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/48—Stabilisers against degradation by oxygen, light or heat
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the field of coatings, and discloses a soft light water-based light-cured coating which comprises the following raw materials in parts by weight: 70-90 parts of polyurethane acrylic ester, 30-50 parts of modified polyacrylate emulsion, 3-8 parts of photoinitiator, 25-40 parts of modified nano silicon dioxide, 0.2-2 parts of flatting agent, 0.2-2 parts of defoamer and 10-25 parts of purified water; the modified polyacrylate emulsion is hydrogenated rosin modified polyacrylate emulsion containing epoxy groups; the modified nano silicon dioxide is prepared by functionalizing the surface of the nano silicon dioxide by using a silane coupling agent and then grafting a hindered phenol antioxidant, the adhesive force and the adhesive property of the photo-curing coating are improved by using the hydrogenated rosin modified polyacrylate emulsion, the hydrogenated rosin is better integrated into a glue film, the better physical property is obtained, and in addition, the surface-functionalized nano silicon dioxide is used for loading the hindered phenol antioxidant, so that the coating is endowed with good mechanical property and antioxidation effect.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a soft light water-based light-cured coating and a preparation method thereof.
Background
The photo-curing paint is also called photosensitive paint, which is formed by using UV to initiate the liquid material with chemical activity to quickly polymerize and crosslink and instantly cure. The water-based light-cured coating inherits and develops the advantages of the traditional oily light-cured coating technology, the water-based coating and the ink technology, and has the advantages of high curing speed, energy conservation, excellent coating performance, wide application range to a substrate, contribution to eliminating VOC and the like, and is widely applied to the fields of materials such as wood, plastics, optical fibers, paper and the like because of the excellent performance advantages such as environmental protection, wide application range, safety, relatively simple construction and the like.
The water-based light-cured coating in the prior art is limited by viscosity, the light-cured resin has lower molecular weight, and higher shrinkage after polymerization reaction, and because of the requirement of faster reaction speed and better performance, some acrylate monomers are often added in the light-cured coating formula to balance the crosslinking density and reduce the reaction steric hindrance, the resin with higher functionality is required to reduce the crosslinking degree through the monomer with low functionality, and the resin with lower functionality is required to improve the reaction speed through the monomer with tri-functionality or higher functionality, but the higher functionality can cause the system shrinkage to be large, so that the mechanical property and the adhesive force of the coating are reduced, and the application of the light-cured coating in the large-scale industrial production of new materials is limited.
Disclosure of Invention
In order to solve the defects in the background art, the invention aims to provide the soft light water-based light-cured coating and the preparation method thereof, wherein the adhesive force and the adhesive property of the light-cured coating are improved by utilizing the hydrogenated rosin modified polyacrylate emulsion, the hydrogenated rosin is better integrated into a glue film, the better physical property is obtained, and in addition, the coating is endowed with good mechanical property and oxidation resistance by utilizing the surface functionalized nano silicon dioxide loaded hindered phenol antioxidant.
The aim of the invention can be achieved by the following technical scheme:
The soft light water-based light-cured coating comprises the following raw materials in parts by weight: 70-90 parts of polyurethane acrylic ester, 30-50 parts of modified polyacrylate emulsion, 3-8 parts of photoinitiator, 25-40 parts of modified nano silicon dioxide, 0.2-2 parts of flatting agent, 0.2-2 parts of defoamer and 10-25 parts of purified water;
the modified polyacrylate emulsion is hydrogenated rosin modified epoxy group-containing polyacrylate emulsion;
The modified nano silicon dioxide is prepared by functionalizing the surface of the nano silicon dioxide by utilizing N- (2-aminoethyl) -3-aminopropyl trimethoxy silane and then grafting a3, 5-di-tert-butyl-4-hydroxybenzoic acid hindered phenol antioxidant.
Preferably, the photoinitiator is one or more of 1-hydroxy-cyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-acetone, benzophenone, dialkoxyacetophenone, alpha-hydroxyalkyl benzophenone; the leveling agent is one or two of BYK333 and BYK 349; the defoaming agent is one or a combination of a plurality of tributyl phosphate, a defoaming agent, a pretty 3100, a defoaming agent BYK088 and a defoaming agent BYK 028.
Preferably, the modified polyacrylate emulsion comprises the following raw materials in parts by weight: 10-25 parts of butyl acrylate, 10-25 parts of methyl methacrylate, 2-5 parts of hydroxyethyl acrylate, 3-10 parts of hydrogenated rosin, 1-3.5 parts of glycidyl methacrylate, 0.1-0.5 part of ammonium persulfate aqueous solution, 1-5 parts of compound emulsifier and 20-50 parts of purified water;
The preparation method of the modified polyacrylate emulsion comprises the following steps:
A. Mixing alkylphenol ethoxylates and sodium dodecyl sulfate to obtain a compound emulsifier, and stirring and mixing the compound emulsifier and purified water to obtain a pre-emulsion;
B. Taking butyl acrylate, methyl methacrylate, hydroxyethyl acrylate, glycidyl methacrylate, a compound emulsifier, hydrogenated rosin and purified water, stirring and mixing, emulsifying for 20-40 min at 400-700 r/min, regulating the stirring rate to 100-250 r/min after the emulsification is completed, simultaneously heating to 70-80 ℃, dropwise adding an initiator ammonium persulfate aqueous solution, and heating to 80-90 ℃;
C. And D, slowly dropwise adding 1mL of ammonium persulfate aqueous solution into the pre-emulsion prepared in the step A by using a dropping funnel every 30min, pouring the residual ammonium persulfate aqueous solution into the pre-emulsion after the completion of dropwise adding, preserving heat for 2-4 h, cooling to 30-50 ℃ and discharging to prepare the modified polyacrylate.
Preferably, the mass ratio of alkylphenol ethoxylates to sodium dodecyl sulfate in the compound emulsifier is 1:1, wherein the mass fraction of the ammonium persulfate aqueous solution is 2.5%.
Preferably, the preparation method of the modified nano-silica comprises the following steps:
S1, dispersing dried nano silicon dioxide in toluene for ultrasonic dispersion, introducing nitrogen for reaction after ultrasonic treatment, adding N- (2-ethylamino) -3-propylamino trimethoxysilane and triethylamine under magnetic stirring, stirring at 70-90 ℃, carrying out reflux reaction for 9-12 h, cooling to room temperature after reaction, sequentially carrying out suction filtration, repeatedly washing with toluene and ethanol, and drying in an oven to obtain the surface-functionalized nano silicon dioxide;
S2, weighing 3, 5-di-tert-butyl-4-hydroxybenzoic acid in a three-mouth bottle, adding chloroform, placing in a magnetic stirring water bath at 40-60 ℃, opening condensed water, slowly dropwise adding distilled thionyl chloride by using a constant pressure dropping funnel, continuing to react for 4-6 hours, and preparing 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride after rotary evaporation of the obtained reaction liquid;
S3, adding toluene into the surface functionalized silica obtained in the step S1 for ultrasonic dispersion, vacuumizing, introducing nitrogen for protection, dissolving the 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride obtained in the step S2 with toluene, slowly dropwise adding, stirring and mixing, dropwise adding triethylamine, reacting for 18-24 hours at constant temperature under the protection of nitrogen, filtering after the reaction is finished, flushing with toluene and methanol for multiple times, and vacuum drying at 70-90 ℃ to obtain the modified nano silica.
Preferably, in the step S1, the mass ratio of the nano silicon dioxide to the N- (2-ethylamino) -3-propylamino trimethoxysilane to the triethylamine is 3-8: 6-10: 1.
Preferably, the mass ratio of the surface functionalized silica to the 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride in the step S3 is 2-5: 1.
A preparation method of soft light water-based light curing paint comprises the following steps: mixing polyurethane acrylic ester, modified polyacrylate emulsion, photoinitiator, modified nano silicon dioxide, defoamer, leveling agent and purified water in parts by weight, stirring and dispersing for 15-30 minutes, and filtering by a 200-300 mesh filter screen to prepare the soft light water-based light-cured coating.
The invention has the beneficial effects that:
The invention takes butyl acrylate, methyl methacrylate and hydroxyethyl acrylate as main monomers, hydrogenated rosin and glycidyl methacrylate as functional monomers, and adopts a semi-continuous emulsion polymerization method to prepare the modified polyacrylate emulsion. The carboxyl contained in the hydrogenated rosin and the epoxy group in the glycidyl methacrylate undergo a ring opening reaction to form a crosslinked network structure, so that the hydrogenated rosin exerts the unique property of the triphenylene ring skeleton, the adhesive force and the adhesive property of the photo-curing coating on a substrate are improved, the hydrogenated rosin is better blended into a glue film, the better physical property is obtained, and the pencil hardness, the solvent resistance and the impact resistance of the glue film are all enhanced. In addition, the high-functional polyurethane acrylic ester is used together with the modified polyacrylate emulsion, so that the reactivity and flexibility of the water-based photo-curing coating are improved.
According to the invention, the ethoxyl group at one end of the silane coupling agent is utilized to generate silicon hydroxyl group after hydrolysis, condensation reaction is carried out with the hydroxyl group of the nano silicon dioxide, so that the surface of the nano silicon dioxide is functionalized, and the carboxyl end of the 3, 5-di-tert-butyl-4-hydroxybenzoic acid is activated to become an acyl chloride structure and then reacts with the amino group at the other end of the aminosilane coupling agent, so that the nano silicon dioxide carries the hindered phenol antioxidant, thereby not only reducing the agglomeration of inorganic particles, being beneficial to the dispersion of the nano silicon dioxide, but also overcoming the physical loss of the antioxidant caused by migration and volatilization to a certain extent, and endowing the coating with good mechanical property and antioxidation effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is an infrared spectrum of the nano silica before and after modification in example 4 of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The polyurethane acrylic ester in the embodiment of the invention is purchased from Changxing, model Etercure6145-100, and the product name is hexafunctional polyurethane acrylic ester.
The preparation method of the modified polyacrylate emulsion in the embodiment 1 comprises the following steps:
A. Mixing alkylphenol ethoxylates and sodium dodecyl sulfate to obtain a compound emulsifier, and stirring and mixing 0.5 part of the compound emulsifier with 8 parts of purified water to obtain a pre-emulsion;
B. 10 parts of butyl acrylate, 12 parts of methyl methacrylate, 2 parts of hydroxyethyl acrylate, 1 part of glycidyl methacrylate, 1 part of compound emulsifier, 3 parts of hydrogenated rosin and 20 parts of purified water are stirred and mixed, emulsification is carried out for 20min under 420r/min, after the emulsification is completed, the stirring rate is regulated to be reduced to 110r/min, meanwhile, the mixture is heated to 70 ℃, an initiator ammonium persulfate aqueous solution is dropwise added, and the temperature is increased to 85 ℃;
C. And D, slowly dropwise adding 1mL of ammonium persulfate aqueous solution into the pre-emulsion prepared in the step A by using a dropping funnel every 30min, pouring the residual ammonium persulfate aqueous solution into the pre-emulsion after the completion of dropwise adding, preserving heat for 2h, cooling to 30 ℃ and discharging to prepare the modified polyacrylate.
Example 2 the preparation method of the modified polyacrylate emulsion comprises the following steps:
A. Mixing alkylphenol ethoxylates and sodium dodecyl sulfate to obtain a compound emulsifier, and stirring and mixing 1 part of the compound emulsifier with 15 parts of purified water to obtain a pre-emulsion;
B. 15 parts of butyl acrylate, 15 parts of methyl methacrylate, 3 parts of hydroxyethyl acrylate, 2 parts of glycidyl methacrylate, 2 parts of compound emulsifier, 5 parts of hydrogenated rosin and 30 parts of purified water are stirred and mixed, emulsification is carried out for 25min under 500r/min, after the emulsification is completed, the stirring rate is regulated to be reduced to 200r/min, meanwhile, the mixture is heated to 80 ℃, an initiator ammonium persulfate aqueous solution is dropwise added, and the temperature is increased to 90 ℃;
C. And D, slowly dropwise adding 1mL of ammonium persulfate aqueous solution into the pre-emulsion prepared in the step A by using a dropping funnel every 30min, pouring the residual ammonium persulfate aqueous solution into the pre-emulsion after the completion of dropwise adding, preserving heat for 2h, cooling to 30 ℃ and discharging to prepare the modified polyacrylate.
Example 3 the preparation method of the modified polyacrylate emulsion comprises the following steps:
A. Mixing alkylphenol ethoxylates and sodium dodecyl sulfate to obtain a compound emulsifier, and stirring and mixing 1 part of the compound emulsifier with 15 parts of purified water to obtain a pre-emulsion;
B. Taking 20 parts of butyl acrylate, 20 parts of methyl methacrylate, 5 parts of hydroxyethyl acrylate, 3 parts of glycidyl methacrylate, 3 parts of compound emulsifier, 7 parts of hydrogenated rosin and 32 parts of purified water, stirring and mixing, emulsifying for 35min at 620r/min, regulating the stirring rate to 250r/min after the emulsification is completed, heating to 80 ℃, dropwise adding an initiator ammonium persulfate aqueous solution, and heating to 90 ℃;
C. And D, slowly dropwise adding 1mL of ammonium persulfate aqueous solution into the pre-emulsion prepared in the step A by using a dropping funnel every 30min, pouring the residual ammonium persulfate aqueous solution into the pre-emulsion after the completion of dropwise adding, preserving heat for 3h, cooling to 45 ℃ and discharging to prepare the modified polyacrylate.
Example 4 the preparation method of the modified nano-silica comprises the following steps:
S1, dispersing 15.0g of dried nano silicon dioxide in toluene for ultrasonic dispersion, introducing nitrogen for reaction after ultrasonic treatment, adding 27.3g of N- (2-ethylamino) -3-propylamino trimethoxysilane and 3.6g of triethylamine under magnetic stirring, stirring at 70 ℃, carrying out reflux reaction for 9 hours, cooling to room temperature after reaction, sequentially carrying out suction filtration, repeatedly washing with toluene and ethanol, and drying in an oven to obtain the surface-functionalized nano silicon dioxide;
S2, weighing 16.8g of 3, 5-di-tert-butyl-4-hydroxybenzoic acid in a three-mouth bottle, adding chloroform, placing in a 42 ℃ magnetic stirring water bath, opening condensed water, slowly dropwise adding distilled thionyl chloride by using a constant pressure dropping funnel, continuing to react for 4 hours, and preparing 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride after rotary evaporation of the obtained reaction liquid;
S3, adding toluene into 10.8g of the surface functionalized silica obtained in the step S1 for ultrasonic dispersion, vacuumizing, introducing nitrogen for protection, dissolving 3.0g of the 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride obtained in the step S2 with toluene, slowly dropwise adding, stirring and mixing, dropwise adding triethylamine, reacting at constant temperature for 18h under the protection of nitrogen, filtering after the reaction is finished, flushing with toluene and methanol for multiple times, and vacuum drying at 70 ℃ to prepare the modified nano silica.
The infrared spectrum analysis is carried out on the nano silicon dioxide and the modified nano silicon dioxide, the result is shown in figure 1, the wide absorption peaks are seen at 3400cm –1 before and after the nano silicon dioxide is grafted with the antioxidant, the absorption peak appears at 2930cm –1 after the nano silicon dioxide surface is grafted with the silane coupling agent, the telescopic vibration peak of-CH 2 on the silane coupling agent corresponds to the telescopic vibration peak of-CH 3 appearing at 2963cm –1 in the curve c, and the characteristic absorption peaks of amide appear at 1637cm –1 and 1558cm –1 are seen as methyl of 3, 5-di-tert-butyl, which indicates that the antioxidant is successfully grafted on the nano silicon dioxide surface.
Example 5 the preparation method of the modified nano-silica comprises the following steps:
S1, dispersing 18.6g of dried nano silicon dioxide in toluene for ultrasonic dispersion, introducing nitrogen for reaction after ultrasonic treatment, adding 28.8g of N- (2-ethylamino) -3-propylamino trimethoxysilane and 3.9g of triethylamine under magnetic stirring, stirring at 70 ℃, carrying out reflux reaction for 10 hours, cooling to room temperature after reaction, sequentially carrying out suction filtration, repeatedly washing with toluene and ethanol, and drying in an oven to obtain the surface-functionalized nano silicon dioxide;
S2, weighing 17.4g of 3, 5-di-tert-butyl-4-hydroxybenzoic acid in a three-necked flask, adding chloroform, placing in a magnetic stirring water bath at 45 ℃, opening condensed water, slowly dropwise adding distilled thionyl chloride by using a constant pressure dropping funnel, and continuously reacting for 6 hours, wherein the obtained reaction liquid is subjected to rotary evaporation to prepare 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride;
s3, adding toluene into 11.4g of the surface functionalized silica obtained in the step S1 for ultrasonic dispersion, vacuumizing, introducing nitrogen for protection, dissolving 3.6g of the 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride obtained in the step S2 with toluene, slowly dropwise adding, stirring and mixing, dropwise adding triethylamine, reacting for 20 hours at constant temperature under the protection of nitrogen, filtering after the reaction is finished, flushing with toluene and methanol for multiple times, and vacuum drying at 90 ℃ to prepare the modified nano silica.
Example 6 the preparation method of the modified nano-silica comprises the following steps:
S1, dispersing 17.1g of dried nano silicon dioxide in toluene for ultrasonic dispersion, introducing nitrogen for reaction after ultrasonic treatment, adding 31.5g of N- (2-ethylamino) -3-propylamino trimethoxysilane and 3.6g of triethylamine under magnetic stirring, stirring at 85 ℃, carrying out reflux reaction for 12h, cooling to room temperature after reaction, sequentially carrying out suction filtration, repeatedly washing with toluene and ethanol, and drying in an oven to obtain the surface-functionalized nano silicon dioxide;
S2, weighing 18.0g of 3, 5-di-tert-butyl-4-hydroxybenzoic acid in a three-necked flask, adding chloroform, placing in a magnetic stirring water bath at 60 ℃, opening condensed water, slowly dropwise adding distilled thionyl chloride by using a constant pressure dropping funnel, continuing to react for 5 hours, and preparing 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride after rotary evaporation of the obtained reaction liquid;
S3, adding toluene into 12.5g of the surface functionalized silica obtained in the step S1 for ultrasonic dispersion, vacuumizing, introducing nitrogen for protection, dissolving 2.7g of the 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride obtained in the step S2 with toluene, slowly dropwise adding, stirring and mixing, dropwise adding triethylamine, reacting for 24 hours at constant temperature under the protection of nitrogen, filtering after the reaction is finished, flushing with toluene and methanol for multiple times, and vacuum drying at 90 ℃ to prepare the modified nano silica.
Example 7 a soft aqueous photocurable coating comprising the following raw materials in parts by weight: 70 parts of polyurethane acrylic ester, 32 parts of modified polyacrylate emulsion, 3 parts of photoinitiator, 27 parts of modified nano silicon dioxide, 0.2 part of flatting agent, 0.2 part of defoamer and 10 parts of purified water;
The preparation method of the soft light water-based light-cured coating comprises the following steps: mixing polyurethane acrylic ester, modified polyacrylate emulsion, photoinitiator, modified nano silicon dioxide, defoamer, leveling agent and purified water in parts by weight, stirring and dispersing for 20 minutes, and filtering by a 200-mesh filter screen to prepare the soft light water-based light-cured coating.
Example 8a soft light aqueous photo-curing coating comprises the following raw materials in parts by weight: 78 parts of polyurethane acrylic ester, 38 parts of modified polyacrylate emulsion, 5 parts of photoinitiator, 30 parts of modified nano silicon dioxide, 1 part of flatting agent, 1 part of defoamer and 15 parts of purified water;
The preparation method of the soft light water-based light-cured coating is the same as in example 7.
Example 9a soft light aqueous photo-curing coating comprises the following raw materials in parts by weight: 85 parts of polyurethane acrylic ester, 47 parts of modified polyacrylate emulsion, 8 parts of photoinitiator, 38 parts of modified nano silicon dioxide, 2 parts of flatting agent, 2 parts of defoamer and 25 parts of purified water;
The preparation method of the soft light water-based light-cured coating is the same as in example 7.
Comparative example 1 a soft aqueous photocurable coating comprising the following raw materials in parts by weight: 78 parts of polyurethane acrylic ester, 35 parts of polyacrylate emulsion, 7 parts of photoinitiator, 30 parts of modified nano silicon dioxide, 0.7 part of flatting agent, 0.8 part of defoamer and 12 parts of purified water;
The preparation method of the soft light water-based light-cured coating is the same as in example 7.
Comparative example 2a soft aqueous photocurable coating comprising the following raw materials in parts by weight: 82 parts of polyurethane acrylic ester, 41 parts of modified polyacrylate emulsion, 6 parts of photoinitiator, 32 parts of nano silicon dioxide, 1.2 parts of flatting agent, 1.2 parts of defoamer and 20 parts of purified water;
The preparation method of the soft light water-based light-cured coating is the same as in example 7.
And (3) performance detection:
the soft light aqueous light-cured coating prepared in examples 7-9 and comparative examples 1-2 was used to prepare a film, the light-cured coating was coated on tin plate with a wire rod, and after standing for 15 seconds, the film was cured by a light-curing machine, and the performance was tested after standing at normal temperature for 24 hours.
Determining adhesive force of the adhesive film by using a cross-cut method according to GB/T9286-2021; determining pencil hardness of the adhesive film according to GB/T6739-2022; the impact resistance of the adhesive film was determined according to GB/T1732-2020; the ageing resistance of the adhesive film was determined according to GB/T1865-2009: according to GB/T9274-1988, the adhesive film is respectively put into 5% hydrochloric acid solution and 5% sodium hydroxide aqueous solution, whether the adhesive film on the tinplate has the phenomena of foaming, falling off and the like is recorded at intervals, the solvent resistance of the adhesive film is measured, and the test results are shown in Table 1.
TABLE 1 adhesive film Performance test results
As can be seen from the data in Table 1, the soft light water-based photo-curing coating prepared in examples 7-8 has excellent adhesive force, excellent mechanical property and oxidation resistance, the polyacrylate emulsion is modified by not adding hydrogenated rosin in comparative example 1, the adhesive force, pencil hardness, acid resistance, alkali resistance and impact resistance are all obviously reduced, the nano silicon dioxide is not modified in comparative example 2, the ageing resistance is obviously reduced, and the pencil hardness and impact resistance are slightly reduced.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (8)
1. The soft light water-based light-cured coating is characterized by comprising the following raw materials in parts by weight: 70-90 parts of polyurethane acrylic ester, 30-50 parts of modified polyacrylate emulsion, 3-8 parts of photoinitiator, 25-40 parts of modified nano silicon dioxide, 0.2-2 parts of flatting agent, 0.2-2 parts of defoamer and 10-25 parts of purified water;
the modified polyacrylate emulsion is hydrogenated rosin modified epoxy group-containing polyacrylate emulsion;
The modified nano silicon dioxide is prepared by functionalizing the surface of the nano silicon dioxide by utilizing N- (2-aminoethyl) -3-aminopropyl trimethoxy silane and then grafting a3, 5-di-tert-butyl-4-hydroxybenzoic acid hindered phenol antioxidant.
2. The soft aqueous photocurable coating of claim 1, wherein said photoinitiator is one or more of 1-hydroxy-cyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzophenone, dialkoxyacetophenone, α -hydroxyalkylbenzophenone; the leveling agent is one or two of BYK333 and BYK 349; the defoaming agent is one or a combination of a plurality of tributyl phosphate, a defoaming agent, a pretty 3100, a defoaming agent BYK088 and a defoaming agent BYK 028.
3. The soft aqueous photocurable coating according to claim 1, wherein the modified polyacrylate emulsion comprises the following raw materials in parts by weight: 10-25 parts of butyl acrylate, 10-25 parts of methyl methacrylate, 2-5 parts of hydroxyethyl acrylate, 3-10 parts of hydrogenated rosin, 1-3.5 parts of glycidyl methacrylate, 0.1-0.5 part of ammonium persulfate aqueous solution, 1-5 parts of compound emulsifier and 20-50 parts of purified water;
The preparation method of the modified polyacrylate emulsion comprises the following steps:
A. Mixing alkylphenol ethoxylates and sodium dodecyl sulfate to obtain a compound emulsifier, and stirring and mixing the compound emulsifier and purified water to obtain a pre-emulsion;
B. Taking butyl acrylate, methyl methacrylate, hydroxyethyl acrylate, glycidyl methacrylate, a compound emulsifier, hydrogenated rosin and purified water, stirring and mixing, emulsifying for 20-40 min at 400-700 r/min, regulating the stirring rate to 100-250 r/min after the emulsification is completed, simultaneously heating to 70-80 ℃, dropwise adding an initiator ammonium persulfate aqueous solution, and heating to 80-90 ℃;
C. And D, slowly dropwise adding 1mL of ammonium persulfate aqueous solution into the pre-emulsion prepared in the step A by using a dropping funnel every 30min, pouring the residual ammonium persulfate aqueous solution into the pre-emulsion after the completion of dropwise adding, preserving heat for 2-4 h, cooling to 30-50 ℃ and discharging to prepare the modified polyacrylate.
4. The soft water-based light-curable coating according to claim 3, wherein the mass ratio of alkylphenol ethoxylates to sodium dodecyl sulfate in the compound emulsifier is 1:1, wherein the mass fraction of the ammonium persulfate aqueous solution is 2.5%.
5. The soft aqueous photocurable coating according to claim 1, characterized in that the preparation method of the modified nanosilica comprises the following steps:
S1, dispersing dried nano silicon dioxide in toluene for ultrasonic dispersion, introducing nitrogen for reaction after ultrasonic treatment, adding N- (2-ethylamino) -3-propylamino trimethoxysilane and triethylamine under magnetic stirring, stirring at 70-90 ℃, carrying out reflux reaction for 9-12 h, cooling to room temperature after reaction, sequentially carrying out suction filtration, repeatedly washing with toluene and ethanol, and drying in an oven to obtain the surface-functionalized nano silicon dioxide;
S2, weighing 3, 5-di-tert-butyl-4-hydroxybenzoic acid in a three-mouth bottle, adding chloroform, placing in a magnetic stirring water bath at 40-60 ℃, opening condensed water, slowly dropwise adding distilled thionyl chloride by using a constant pressure dropping funnel, continuing to react for 4-6 hours, and preparing 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride after rotary evaporation of the obtained reaction liquid;
S3, adding toluene into the surface functionalized silica obtained in the step S1 for ultrasonic dispersion, vacuumizing, introducing nitrogen for protection, dissolving the 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride obtained in the step S2 with toluene, slowly dropwise adding, stirring and mixing, dropwise adding triethylamine, reacting for 18-24 hours at constant temperature under the protection of nitrogen, filtering after the reaction is finished, flushing with toluene and methanol for multiple times, and vacuum drying at 70-90 ℃ to obtain the modified nano silica.
6. The soft water-based light-curable coating according to claim 5, wherein the mass ratio of nano silicon dioxide, N- (2-ethylamino) -3-propylaminotrimethoxysilane and triethylamine in the step S1 is 3-8: 6-10: 1.
7. The soft aqueous photocurable coating according to claim 5, wherein the mass ratio of the surface functionalized silica to the 3, 5-di-t-butyl-4-hydroxybenzoyl chloride in the step S3 is 2 to 5:1.
8. The method for preparing the soft water-based light-curable coating according to claim 1, comprising the steps of: mixing polyurethane acrylic ester, modified polyacrylate emulsion, photoinitiator, modified nano silicon dioxide, defoamer, leveling agent and purified water in parts by weight, stirring and dispersing for 15-30 minutes, and filtering by a 200-300 mesh filter screen to prepare the soft light water-based light-cured coating.
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