CN115074000A - Ultraviolet-proof coating and preparation method thereof - Google Patents
Ultraviolet-proof coating and preparation method thereof Download PDFInfo
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- CN115074000A CN115074000A CN202210927886.9A CN202210927886A CN115074000A CN 115074000 A CN115074000 A CN 115074000A CN 202210927886 A CN202210927886 A CN 202210927886A CN 115074000 A CN115074000 A CN 115074000A
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- titanium dioxide
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- epoxy resin
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- 238000000576 coating method Methods 0.000 title claims abstract description 41
- 239000011248 coating agent Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000839 emulsion Substances 0.000 claims abstract description 26
- 239000003822 epoxy resin Substances 0.000 claims abstract description 26
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 26
- 239000003973 paint Substances 0.000 claims abstract description 25
- 239000000661 sodium alginate Substances 0.000 claims abstract description 19
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 19
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 19
- -1 sodium alginate modified nano titanium dioxide Chemical class 0.000 claims abstract description 16
- 239000002270 dispersing agent Substances 0.000 claims abstract description 14
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 7
- 229920000180 alkyd Polymers 0.000 claims abstract description 7
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 7
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 7
- 239000000080 wetting agent Substances 0.000 claims abstract description 7
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 31
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 15
- 239000004408 titanium dioxide Substances 0.000 claims description 14
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 5
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 claims description 5
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 4
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 claims description 3
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 claims description 3
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 3
- 229920000053 polysorbate 80 Polymers 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 230000006750 UV protection Effects 0.000 abstract description 8
- 239000003513 alkali Substances 0.000 abstract description 5
- 238000003860 storage Methods 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 3
- 238000005201 scrubbing Methods 0.000 abstract description 3
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 17
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 229920000058 polyacrylate Polymers 0.000 description 7
- 239000011787 zinc oxide Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000004816 latex Substances 0.000 description 3
- 229920000126 latex Polymers 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- ZQBAKBUEJOMQEX-UHFFFAOYSA-N salicylic acid phenyl ester Natural products OC1=CC=CC=C1C(=O)OC1=CC=CC=C1 ZQBAKBUEJOMQEX-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 2
- HJIAMFHSAAEUKR-UHFFFAOYSA-N (2-hydroxyphenyl)-phenylmethanone Chemical compound OC1=CC=CC=C1C(=O)C1=CC=CC=C1 HJIAMFHSAAEUKR-UHFFFAOYSA-N 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229960001126 alginic acid Drugs 0.000 description 1
- 239000000783 alginic acid Substances 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 150000004781 alginic acids Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229940050390 benzoate Drugs 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229940114081 cinnamate Drugs 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- NPZTUJOABDZTLV-UHFFFAOYSA-N hydroxybenzotriazole Substances O=C1C=CC=C2NNN=C12 NPZTUJOABDZTLV-UHFFFAOYSA-N 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000000593 microemulsion method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- FTWUXYZHDFCGSV-UHFFFAOYSA-N n,n'-diphenyloxamide Chemical compound C=1C=CC=CC=1NC(=O)C(=O)NC1=CC=CC=C1 FTWUXYZHDFCGSV-UHFFFAOYSA-N 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000002103 nanocoating Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- WBYWAXJHAXSJNI-VOTSOKGWSA-M trans-cinnamate Chemical compound [O-]C(=O)\C=C\C1=CC=CC=C1 WBYWAXJHAXSJNI-VOTSOKGWSA-M 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to an ultraviolet-proof coating and a preparation method thereof, wherein the raw materials for preparing the coating comprise: 40-50 parts of self-emulsifying epoxy resin emulsion, 10-15 parts of epoxy resin modified silicone-acrylate emulsion, 15-25 parts of alkyd resin, 25-55 parts of sodium alginate modified nano titanium dioxide, 5-9 parts of dispersing agent, 0.5-2 parts of defoaming agent, 1-3 parts of wetting agent, 0.2-0.4 part of dioctyl phthalate and 100 parts of water; the water does not comprise water contained in the sodium alginate modified nano titanium dioxide; the dispersant comprises a combination of sodium oleate and polyethylene glycol. The paint disclosed by the invention is good in storage stability, and the hardness of a paint film is high, so that physical damage resistance is facilitated; excellent water resistance, acid and alkali resistance and scrubbing resistance; the ultraviolet resistance is excellent.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to an ultraviolet-proof coating and a preparation method thereof.
Background
Light, heat, water, oxygen, inorganic salts, organic solvents, pollutants and the like in the environment are all main factors promoting the degradation of the film forming substances. Of these factors, solar ultraviolet radiation is the most dominant and common factor responsible for degradation of film-forming materials. The exterior wall coating begins its irreversible degradation process from the moment of use. Therefore, it is necessary to enhance the uv-blocking properties of exterior wall coatings, and the simplest and most effective method is to add additives having uv-blocking properties, mainly organic uv-blocking agents and inorganic uv-blocking agents, to exterior wall coatings.
The ultraviolet-proof coating is a coating which can effectively resist ultraviolet irradiation and aging as the name suggests. In the United states, Foster products company uses nano-zinc oxide, hydroxyethyl cellulose as a thickening agent, and adds other auxiliary agents to fully disperse with water, and then the nano-zinc oxide and the water are stirred and mixed with acrylic emulsion to prepare the ultraviolet aging resistant water-based paint. In addition, Elementis corporation in the united states utilizes nano ZnO with the grain size of about 80nm produced by the corporation to be compounded with a certain solvent, resin, auxiliary agent and organic anti-ultraviolet agent to prepare an anti-ultraviolet premix which can be used as a part of the formula of paint and plastic.
The currently widely used organic ultraviolet ray shielding agents comprise o-hydroxybenzophenone, o-hydroxybenzotriazole, o-hydroxybenzotriazine, salicylate, benzoate, cinnamate, oxalanilide and the like, but the addition of an organic ultraviolet ray shielding agent to improve the ultraviolet ray resistance of the coating has many disadvantages. Firstly, the organic ultraviolet screening agent has certain toxicity; secondly, the organic ultraviolet screening agent has selectivity to the absorption of ultraviolet rays; finally, the uv blocking properties of the organic uv screener gradually diminish or even disappear over time.
The inorganic ultraviolet screening agent mainly comprises nano titanium dioxide, nano silicon dioxide, nano zinc oxide and the like. The nanometer titanium dioxide has the advantages of stable chemical property, no toxicity, low price, strong ultraviolet shielding performance and the like, so that the nanometer titanium dioxide is attracted by people. The nano titanium dioxide has strong ultraviolet shielding performance, the smaller the particle size is, the stronger the ultraviolet shielding performance is, and the submicron titanium dioxide hardly shields ultraviolet rays. The ultraviolet shielding performance of the nano titanium dioxide is determined by the absorption capacity and the scattering capacity of the nano titanium dioxide. The absorption of ultraviolet light by nano-titania is mainly due to its semiconducting properties. When ultraviolet light is irradiated, ultraviolet light is absorbed in a process in which electrons are excited and then transit from a valence band to a conduction band. The nano titanium dioxide not only has the performance of absorbing ultraviolet rays, but also has the performance of scattering the ultraviolet rays. Ultraviolet rays are essentially electromagnetic waves, and when ultraviolet rays act on nano titanium dioxide in a medium, electrons in the nano titanium dioxide particles are forced to vibrate (the vibration frequency is the same as the frequency of incident light waves) due to the fact that the size of the nano titanium dioxide particles is smaller than the wavelength of the ultraviolet rays, so that the electrons become secondary wave sources, and the electromagnetic waves are emitted in all directions, namely the scattering of the ultraviolet rays.
However, the problems of dispersibility and stability of the nano titanium dioxide in the coating are key problems to be solved by the nano coating. In order to solve the problem, the Chinese granted patent CN105017871B discloses an ultraviolet-proof exterior wall coating and a preparation method thereof, the preparation method comprises the steps of firstly coating a layer of acrylate polymer on the surface of nano titanium dioxide to obtain nano titanium dioxide/acrylate polymer composite emulsion, then fully mixing the composite emulsion and the acrylate polymer exterior wall emulsion, and then adding a pigment, a filler, an auxiliary agent and water. The coating coats a layer of acrylate polymer on the surface of the nano titanium dioxide, so that the dispersibility and stability of the nano titanium dioxide in the coating are obviously improved, nano titanium dioxide aggregates are prevented from being formed, and the ultraviolet resistance of the aggregates is greatly reduced or even eliminated. The coating not only has the characteristics of excellent water resistance, alkali resistance, scrub resistance and the like of the acrylate polymer exterior wall coating, but also improves the hardness and the ultraviolet resistance of the coating, and prolongs the service life of the coating. However, the coating relates to a method for coating a layer of acrylate polymer on the surface of nano titanium dioxide to obtain nano titanium dioxide/acrylate polymer composite emulsion, and the preparation process is complex and the production cost is high.
In addition, a Chinese granted patent CN104403428B discloses an ultraviolet-proof paint without toxic ultraviolet absorber and a preparation method thereof, wherein the paint is composed of the following raw materials in parts by weight: 30-40 parts of polystyrene latex; 10-16 parts of epoxy resin primer; 2-8 parts of a leveling agent; 17-20 parts of an ultraviolet absorbent; 10-18 parts of inorganic filler; the ultraviolet absorbent consists of the following components in parts by weight: 14-15 parts of 2-hydroxy-4-n-octoxy benzophenone; 3-5 parts of phenyl o-hydroxybenzoate. The ultraviolet-proof coating disclosed by the invention does not contain a toxic ultraviolet absorber, is safe and harmless to human bodies and the environment, and is beneficial to environmental protection and construction safety; the added epoxy resin primer can increase the adhesion of the coating on the surface of an object; the micro-emulsion method is utilized to synthesize the polystyrene latex, and the synthesized polystyrene latex has the advantages of small particle size, good dispersibility, good stability and the like, and is beneficial to coating of paint; the addition of the inorganic filler can increase the hardness, strength and wear resistance of the coating; the ultraviolet-proof coating has simple preparation process and convenient operation.
Although the existing ultraviolet-proof coating has been developed, the technical problem to be solved by those skilled in the art is still how to further reduce the production cost and obtain a coating with good stability and ultraviolet-proof effect.
Disclosure of Invention
Based on the background technology, the technical problem to be solved by the invention is to provide a coating with low production cost, good stability and good ultraviolet-proof effect. In order to realize the purpose of the invention, the following technical scheme is adopted:
the invention relates to an ultraviolet-proof paint, which is characterized in that the raw materials for preparing the paint comprise:
40-50 parts of self-emulsifying epoxy resin emulsion, 10-15 parts of epoxy resin modified silicone-acrylate emulsion, 15-25 parts of alkyd resin, 25-55 parts of sodium alginate modified nano titanium dioxide, 5-9 parts of dispersing agent, 0.5-2 parts of defoaming agent, 1-3 parts of wetting agent, 0.2-0.4 part of dioctyl phthalate and 100 parts of water; the water does not comprise water contained in the sodium alginate modified nano titanium dioxide;
the dispersant comprises a combination of sodium oleate and polyethylene glycol;
the sodium alginate modified nano titanium dioxide is prepared by the following method:
dissolving 1-2 parts by weight of sodium alginate in 50-100 parts by weight of water, adding 3-8 parts by weight of titanium dioxide with average particle size of 50-150nm, and adding 1-2 parts by weight of CaCl under the condition of uniform stirring 2 And standing after even stirring to form the sodium alginate modified nano titanium dioxide.
In a preferred embodiment of the invention, the dispersant is prepared from sodium oleate and polyethylene glycol in a ratio of 1-2: 1-2 by mass ratio. The ultraviolet resistance of the coating is improved by controlling the proportion of the dispersant.
In a preferred embodiment of the present invention, the titanium dioxide has an average particle diameter of 50 to 75 nm. By controlling the average particle diameter of titanium dioxide within this preferred range, it is possible to contribute to the improvement of the ultraviolet ray resistance of the coating material.
In a preferred embodiment of the present invention, the titanium dioxide has an average particle diameter of 90 to 110 nm. By controlling the average particle diameter of titanium dioxide within this preferred range, it is possible to contribute to an improvement in the scrub resistance of the coating material.
The invention also relates to a preparation method of the coating, which is characterized by comprising the following steps:
sequentially putting water, self-emulsifying epoxy resin emulsion, epoxy resin modified silicone-acrylic emulsion and alkyd resin into a mixing kettle, and stirring and mixing for 10-20min at the rotating speed of 200-400 rpm; increasing the rotation speed to 450-700rpm, adding the sodium alginate modified nano titanium dioxide, stirring for 3-8min, and heating to 40-50 ℃; when the fineness is less than or equal to 25 mu m by sampling detection, adding a dispersing agent, a defoaming agent, a wetting agent and dioctyl phthalate, and increasing the rotating speed to 800-; sampling from the mixing kettle every 8-12min, scraping on a glass plate without shrinkage cavity, cooling to room temperature, and packaging.
In a preferred embodiment of the present invention, the self-emulsifying epoxy resin emulsion is prepared as follows:
adding sodium dodecyl benzene sulfonate, polyoxyethylene sorbitan monooleate, bisphenol A type epoxy resin and bisphenol A into a reactor, stirring and heating to 130-150 ℃, stirring for 20-40min, slowly adding triphenylphosphine, monitoring at any time, cooling the reaction system to 60-80 ℃ after the epoxy value of the system is less than 0.2, adding propylene glycol butyl ether and benzyl alcohol, continuously stirring for 30-50min, adding water, and continuously stirring at a high speed for 5-10 min.
In a preferred embodiment of the present invention, the epoxy resin modified silicone-acrylate emulsion is prepared by the following steps:
adding sodium dodecyl benzene sulfonate and acrylic acid monomer into water, heating to 70-75 ℃, stirring for 10-15min, slowly dripping sodium persulfate solution with the mass concentration of 1-5%, continuously stirring for 30-50min, adding epoxy resin and organic silicon emulsion, heating to 80-85 ℃, stirring for reacting for 3-4h, cooling to 40-50 ℃, adjusting the pH of the system to 8 by ammonia water, and filtering.
Advantageous effects
The paint disclosed by the invention is good in storage stability, and the hardness of a paint film is high, so that physical damage resistance is facilitated; excellent water resistance, acid and alkali resistance and scrubbing resistance; the ultraviolet resistance is excellent.
Detailed Description
In order to further understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise specified, the reagents involved in the examples of the present invention are all commercially available products, and all of them are commercially available.
Example 1:
an ultraviolet-proof coating comprises the following components in parts by weight:
44 parts of self-emulsifying epoxy resin emulsion, 12 parts of epoxy resin modified silicone-acrylate emulsion, 20 parts of alkyd resin, 30 parts of sodium alginate modified nano titanium dioxide, 7 parts of dispersant prepared by compounding sodium oleate and polyethylene glycol according to the mass ratio of 1:1, BKY-0201 parts of defoaming agent, 4052 parts of wetting agent X, 0.3 part of dioctyl phthalate and 150 parts of water.
The preparation method of the self-emulsifying epoxy resin emulsion comprises the following steps:
adding sodium dodecyl benzene sulfonate, polyoxyethylene sorbitan monooleate, bisphenol A type epoxy resin and bisphenol A into a reactor, stirring and heating to 140 ℃, stirring for 25min, slowly adding triphenyl phosphorus, monitoring at any time, cooling a reaction system to 60 ℃ after the epoxy value of the system is less than 0.2, adding propylene glycol butyl ether and benzyl alcohol, continuously stirring for 35min, adding water, and continuously stirring at a high speed for 5 min.
The preparation method of the epoxy resin modified silicone-acrylate emulsion comprises the following steps:
adding sodium dodecyl benzene sulfonate and acrylic acid monomer into water, heating to 70 ℃, stirring for 12min, slowly dripping sodium persulfate solution with the mass concentration of 2%, continuously stirring for 50min, adding epoxy resin and organic silicon emulsion, heating to 80 ℃, stirring for reacting for 4h, cooling to 40 ℃, adjusting the pH of the system to 8 by ammonia water, and filtering.
Wherein, the preparation method of the alginic acid modified nanometer titanium dioxide comprises the following steps:
dissolving 1 part by weight of sodium alginate in 50 parts by weight of water, adding 5 parts by weight of titanium dioxide with the average particle size of 55nm, and adding 1 part by weight of CaCl under the condition of uniformly stirring 2 And standing after even stirring to form the sodium alginate modified nano titanium dioxide.
The invention also provides a preparation method of the ecological water-based paint, which comprises the following steps:
sequentially putting water, self-emulsifying epoxy resin emulsion, epoxy resin modified silicone-acrylate emulsion and alkyd resin into a mixing kettle, and stirring and mixing for 20min at the rotating speed of 300 rpm; increasing the rotating speed to 600rpm, adding the sodium alginate modified nano titanium dioxide, stirring for 5min, and heating to 45 ℃; when the fineness is less than or equal to 25 mu m by sampling and detecting, adding a dispersing agent, a defoaming agent BKY-020, a wetting agent X405 and dioctyl phthalate, and increasing the rotating speed to 1000rpm for stirring; sampling from the mixing kettle every 10min, scraping on a glass plate without shrinkage cavity, cooling to room temperature, and packaging.
Example 2:
the same as example 1, except that the amount of sodium alginate-modified nano titanium dioxide was 40 parts.
Example 3:
the same as in example 1 except that the average particle diameter of titanium dioxide was 100 nm.
Comparative example 1:
the same as in example 1, except that the same weight of polylactic acid was used instead of sodium alginate.
Comparative example 2:
the same as in example 1, except that the dispersant consists of polyethylene glycol only.
Comparative example 3:
the same as in example 1 except that nano zinc oxide having an average particle diameter of 65nm was used in place of nano titanium dioxide.
Description of the test
The UV blocking coatings prepared in examples 1-3 and comparative examples 1-3 were tested:
the storage stability of the coating is tested at a high temperature (50 ℃), the test time is 2 months, no floating oil and no precipitate are recorded as ++, floating oil or precipitate are recorded as +, and floating oil and precipitate appear simultaneously and are recorded as-;
the ultraviolet resistance of the paint film is tested by adopting an accelerated aging instrument, the ultraviolet light source is a lamp tube with the specification of UVA-340nm, and the irradiation intensity is 1.0W/m 2 Recording a time when a coating film (thickness 1mm) formed by the paint starts to develop chalking, foaming and/or cracking;
measuring the hardness of the paint film according to GB/T6739-2006;
the water resistance of the paint film is determined according to GB 5209-1985;
the alkali resistance of the paint film is determined according to GB 9274-1988;
the scrub resistance of the paint films was determined according to GB/T9266-88.
TABLE 1 ultraviolet protection coating Performance test results
The experimental results show that the paint disclosed by the invention is good in storage stability, and the hardness of a paint film is high, so that the paint is beneficial to resisting physical damage; excellent water resistance, acid and alkali resistance and scrubbing resistance; the ultraviolet resistance is excellent. In particular, example 1 is the most excellent in ultraviolet light blocking performance, while example 2 is the most excellent in scrub resistance.
The foregoing describes preferred embodiments of the present invention, but is not intended to limit the invention thereto. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.
Claims (6)
1. An ultraviolet-proof paint is characterized in that raw materials for preparing the paint comprise:
40-50 parts of self-emulsifying epoxy resin emulsion, 10-15 parts of epoxy resin modified silicone-acrylate emulsion, 15-25 parts of alkyd resin, 25-55 parts of sodium alginate modified nano titanium dioxide, 5-9 parts of dispersing agent, 0.5-2 parts of defoaming agent, 1-3 parts of wetting agent, 0.2-0.4 part of dioctyl phthalate and 100 parts of water; the water does not comprise water contained in the sodium alginate modified nano titanium dioxide;
the dispersant comprises a combination of sodium oleate and polyethylene glycol;
the sodium alginate modified nano titanium dioxide is prepared by the following method:
dissolving 1-2 parts by weight of sodium alginate in 50-100 parts by weight of water, adding 3-8 parts by weight of titanium dioxide with average particle size of 50-150nm, and adding 1-2 parts by weight of CaCl under the condition of uniform stirring 2 And standing after even stirring to form the sodium alginate modified nano titanium dioxide.
2. The uv blocking coating of claim 1, wherein the dispersant is a mixture of sodium oleate and polyethylene glycol in a ratio of 1-2: 1-2 by mass ratio.
3. The ultraviolet blocking paint according to claim 1, wherein the titanium dioxide has an average particle diameter of 50 to 75 nm.
4. The ultraviolet blocking paint according to claim 1, wherein the titanium dioxide has an average particle diameter of 90 to 110 nm.
5. A method for preparing the coating according to any one of claims 1 to 4, characterized by comprising the steps of:
sequentially putting water, self-emulsifying epoxy resin emulsion, epoxy resin modified silicone-acrylate emulsion and alkyd resin into a mixing kettle, and stirring and mixing for 10-20min at the rotating speed of 200-400 rpm; increasing the rotation speed to 450-700rpm, adding the sodium alginate modified nano titanium dioxide, stirring for 3-8min, and heating to 40-50 ℃; when the fineness is less than or equal to 25 mu m by sampling detection, adding a dispersing agent, a defoaming agent, a wetting agent and dioctyl phthalate, and increasing the rotating speed to 800-; sampling from the mixing kettle every 8-12min, scraping on a glass plate without shrinkage cavity, cooling to room temperature, and packaging.
6. The method of claim 5, wherein the self-emulsifying epoxy resin emulsion is prepared by the following steps:
adding sodium dodecyl benzene sulfonate, polyoxyethylene sorbitan monooleate, bisphenol A type epoxy resin and bisphenol A into a reactor, stirring and heating to 130-150 ℃, stirring for 20-40min, slowly adding triphenylphosphine, monitoring at any time, cooling the reaction system to 60-80 ℃ after the epoxy value of the system is less than 0.2, adding propylene glycol butyl ether and benzyl alcohol, continuously stirring for 30-50min, adding water, and continuously stirring at a high speed for 5-10 min.
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