CN116589901A - Solvent-free epoxy coating with high weather resistance - Google Patents
Solvent-free epoxy coating with high weather resistance Download PDFInfo
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- CN116589901A CN116589901A CN202211623931.8A CN202211623931A CN116589901A CN 116589901 A CN116589901 A CN 116589901A CN 202211623931 A CN202211623931 A CN 202211623931A CN 116589901 A CN116589901 A CN 116589901A
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- epoxy coating
- coating
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- 229920006334 epoxy coating Polymers 0.000 title claims abstract description 29
- 239000003085 diluting agent Substances 0.000 claims abstract description 29
- 239000003822 epoxy resin Substances 0.000 claims abstract description 22
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- -1 alicyclic amine Chemical class 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 239000003444 phase transfer catalyst Substances 0.000 claims description 12
- GDESWOTWNNGOMW-UHFFFAOYSA-N resorcinol monobenzoate Chemical compound OC1=CC=CC(OC(=O)C=2C=CC=CC=2)=C1 GDESWOTWNNGOMW-UHFFFAOYSA-N 0.000 claims description 12
- HTZCNXWZYVXIMZ-UHFFFAOYSA-M benzyl(triethyl)azanium;chloride Chemical group [Cl-].CC[N+](CC)(CC)CC1=CC=CC=C1 HTZCNXWZYVXIMZ-UHFFFAOYSA-M 0.000 claims description 10
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical group CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000003112 inhibitor Substances 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical group COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000004821 distillation Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- 239000003973 paint Substances 0.000 abstract description 17
- 239000004593 Epoxy Substances 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 238000000576 coating method Methods 0.000 description 21
- 239000011248 coating agent Substances 0.000 description 20
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 5
- 239000006184 cosolvent Substances 0.000 description 5
- 239000012752 auxiliary agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005562 fading Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012763 reinforcing filler Substances 0.000 description 3
- 238000000967 suction filtration Methods 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 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 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013530 defoamer Substances 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- 239000013008 thixotropic agent Substances 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 1
- 229940126062 Compound A Drugs 0.000 description 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000000080 wetting agent 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
- 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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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 the technical field of paint preparation, and discloses a solvent-free epoxy paint with high weather resistance. The solvent-free epoxy coating with high weather resistance comprises a component A and a component B, wherein the component A comprises epoxy resin and reactive diluent, and the component B comprises alicyclic amine curing agent. According to the invention, the active diluent capable of absorbing ultraviolet is participated in the film forming reaction and grafted on the film forming material, and the active diluent is utilized to effectively absorb 280-340nm ultraviolet in sunlight, so that the influence of ultraviolet in sunlight on the epoxy resin is reduced, and the weather resistance of the epoxy paint is greatly improved.
Description
Technical Field
The invention relates to the technical field of paint preparation, in particular to a solvent-free epoxy paint with high weather resistance.
Background
Coating is the most economical, effective and most common technique for controlling corrosion of ships. The epoxy anticorrosive paint is one of the most widely applied anticorrosive paint in the world at present, and is first in the anticorrosive paint variety structure, and the market share of the epoxy paint in China reaches 33% -39%.
However, with the expansion of application fields and increasing importance of human beings on environmental protection, the use of the traditional solvent-based epoxy finish paint is more and more limited, and the volume and the solid content are low; secondly, the traditional solvent type coating film has poor weather resistance, such as the conventional bisphenol A type epoxy resin, wherein aromatic ether bonds are easy to degrade and break after being irradiated by ultraviolet rays in sunlight, and the coating can have the problems of color change, fading, cracking, chalking, reduced glossiness and the like.
In the prior art, as disclosed in chinese patent application publication No. CN115011218A, a solvent-free epoxy cabin coating is provided, which is prepared by blending a component a and a component B, wherein the component a comprises the following raw materials in parts by weight: 80-100 parts of modified epoxy resin, 30-50 parts of reinforcing filler, 3-5 parts of defoamer, 1-3 parts of dispersant and 1-3 parts of thixotropic agent, wherein the component B comprises the following powder raw materials by weight: 10-15 parts of a curing accelerator and 40-50 parts of a curing agent. When the component A and the component B are blended, the curing agent acts on epoxy groups of the modified epoxy resin and the reinforcing filler, so that the reinforcing filler is grafted in modified epoxy resin molecules, the mechanical property of the coating film is enhanced, and meanwhile, the molecules contain a large number of hydroxyl groups, so that the adhesive force of the coating film is improved. But still further improvement in its weather resistance is required.
Disclosure of Invention
In order to solve the technical problems, the invention provides a solvent-free epoxy coating with high weather resistance. According to the invention, the active diluent capable of absorbing ultraviolet is participated in the film forming reaction and grafted on the film forming material, and the active diluent is utilized to effectively absorb 280-340nm ultraviolet in sunlight, so that the influence of ultraviolet in sunlight on the epoxy resin is reduced, and the weather resistance of the epoxy paint is greatly improved.
The specific technical scheme of the invention is as follows:
the invention provides a solvent-free epoxy coating with high weather resistance, which comprises a component A and a component B. The component A comprises epoxy resin and reactive diluent, and the component B comprises alicyclic amine curing agent. The chemical structural formula of the reactive diluent is as follows:
in the solvent-free epoxy coating with high weather resistance, the reactive diluent is added, and when the component A and the component B are blended, the alicyclic amine curing agent and the epoxy resin react to form a film, and in the process, the reactive diluent and the alicyclic amine curing agent also react to participate in the reaction of the alicyclic amine curing agent and the epoxy resin and are grafted on a film forming material. The active diluent is utilized to effectively absorb 280-340nm ultraviolet rays in sunlight, so that the influence of the ultraviolet rays in the sunlight on the epoxy resin is reduced, and the weather resistance of the epoxy coating is greatly improved.
The preparation reaction equation of the reactive diluent is as follows:
the resorcinol monobenzoate can absorb sunlight and ultraviolet rays in a fluorescent light source without change, and the resorcinol monobenzoate is grafted on a film forming material during film forming reaction by connecting epoxy groups on resorcinol monobenzoate molecules. The invention reacts epichlorohydrin with resorcinol monobenzoate to prepare the compound A, namely the reactive diluent. The reactive diluent has ultraviolet absorption capability, can dissolve or disperse film forming substances, reduces VOC emission, and can increase the weather resistance of the epoxy coating.
Specifically, the invention provides a preparation method of a reactive diluent, which comprises the following steps:
mixing resorcinol monobenzoate with sodium hydroxide solution, adding a phase transfer catalyst, a polymerization inhibitor and a water-carrying agent, dropwise adding epoxy chloropropane under the condition of hot stirring, reacting, taking filtrate, removing water, removing epoxy chloropropane, distilling, and collecting fractions to obtain the active diluent.
In the preparation process of the active diluent, the phase transfer catalyst and sodium hydroxide form ion pairs with certain solubility in an organic solvent in an aqueous phase, the ion pairs are extracted into the organic phase under strong stirring, alkoxide anions are formed by the ion pairs and resorcinol monobenzoate in the organic phase, the alkoxide anions react with epoxy chloropropane to produce a target product, and the released phase transfer catalyst returns to the aqueous phase again to circularly enable the catalytic reaction to be carried out.
Preferably, the phase transfer catalyst is benzyl triethyl ammonium chloride, the polymerization inhibitor is p-hydroxyanisole, and the water-carrying agent is dimethylbenzene.
Preferably, the temperature of the hot agitation is 65-75 ℃.
Preferably, the reaction time is 2 to 5 hours.
Preferably, the distillation is a reduced pressure distillation at a pressure of 50-66Pa and a temperature of 105-108 ℃.
Preferably, the epoxy resin is a hydrogenated epoxy resin.
Specifically, the component A comprises the following components in parts by weight: 30-40 parts of epoxy resin, 3-8 parts of reactive diluent, 12-16 parts of composite ferrophosphorus powder, 2-3 parts of iron oxide red, 8-12 parts of titanium dioxide, 4-6 parts of mica powder, 18-21 parts of barium sulfate, 4-6 parts of talcum powder, 0.1-0.2 part of defoamer, 0.3-0.6 part of wetting agent, 0.2-0.3 part of thixotropic agent and 3-4 parts of benzoic acid. The component B comprises the following components in parts by weight: 21-27 parts of alicyclic amine curing agent, 1-3 parts of propylene glycol methyl ether and 0.4-0.6 part of cosolvent. When in use, the components A and B are uniformly mixed according to the mass ratio of 6.5-7.5:1, and are coated for use.
Compared with the prior art, the invention has the following technical effects:
(1) According to the solvent-free epoxy coating provided by the invention, the resorcinol monobenzoate functional group is grafted in the film forming reaction, so that ultraviolet rays with the wavelength range of 280-340 nanometers can be effectively absorbed, the influence of the ultraviolet rays in sunlight on the epoxy resin is reduced, and the weather resistance is further effectively improved.
(2) The reactive diluent provided by the invention has ultraviolet absorption capability, can dissolve or disperse film forming substances, reduces VOC emission, and can increase the weather resistance of the epoxy coating.
(3) The preparation method of the solvent-free epoxy paint provided by the invention is simple and convenient, and has an industrial prospect.
Drawings
FIG. 1 is a graph showing the results of an artificially accelerated ultraviolet test for forming a coating layer from the paint prepared in example 1 of the present invention;
FIG. 2 is a graph showing the results of an artificially accelerated ultraviolet test for forming a coating layer from the coating material prepared in example 2 of the present invention;
FIG. 3 is a graph showing the results of an artificially accelerated ultraviolet test for forming a coating layer from the coating material prepared in example 3 of the present invention;
FIG. 4 is a graph showing the results of an artificially accelerated ultraviolet test for forming a coating layer from the coating material prepared in comparative example 1 of the present invention;
FIG. 5 is a graph showing the results of a commercially available, artificially accelerated ultraviolet test for forming a coating layer from a coating of the same type of product.
Detailed Description
The invention is further described below with reference to examples.
Example 1
Reactive diluent preparation:
37g of resorcinol monobenzoate and 45g of sodium hydroxide solution with the mass concentration of 40% are mixed, 0.012g of phase transfer catalyst benzyl triethyl ammonium chloride, 0.008g of polymerization inhibitor p-hydroxy anisole and 45g of water-carrying agent xylene are added, the temperature is controlled to be 70 ℃ by heating with a constant-temperature oil bath, and excessive epichlorohydrin in a constant-pressure dropping funnel is slowly added into a flask in a dropwise manner under stirring to react. After 3h of reaction, removing sodium hydroxide, a phase transfer catalyst and other components by suction filtration, collecting filtrate, drying by anhydrous sodium carbonate, distilling at normal pressure to remove excessive epichlorohydrin, distilling under reduced pressure at 50-66Pa, and collecting a fraction at 105 ℃ to obtain colorless transparent liquid, namely a target product.
Preparing solvent-free epoxy paint:
the formula comprises the following components: see table 1.
TABLE 1
Sequentially placing hydrogenated epoxy resin, pigment filler, solvent and auxiliary agent into a charging bucket of a high-speed dispersing machine from liquid to powder and from low density to high density, dispersing and grinding for about 2 hours at a rotating speed of 3000r/min, filtering to obtain a solvent-free epoxy coating A component, wherein the fineness is below 50 mu m; adding quantitative propylene glycol methyl ether and cosolvent into alicyclic amine curing agent, and dispersing at 3000r/min for 30min to obtain solvent-free epoxy coating B component; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 7:1, so as to obtain the solvent-free epoxy coating with high weather resistance.
Example 2
Reactive diluent preparation:
36g of resorcinol monobenzoate and 60g of sodium hydroxide solution with the mass concentration of 30% are mixed, 0.012g of phase transfer catalyst benzyl triethyl ammonium chloride, 0.008g of polymerization inhibitor p-hydroxy anisole and 45g of water-carrying agent xylene are added, the temperature is controlled to be 75 ℃ by heating with a constant-temperature oil bath, and excessive epichlorohydrin in a constant-pressure dropping funnel is slowly added into a flask in a dropwise manner under stirring to carry out reaction. After 2h of reaction, removing sodium hydroxide, a phase transfer catalyst and other components by suction filtration, collecting filtrate, drying by anhydrous sodium carbonate, distilling at normal pressure to remove excessive epichlorohydrin, distilling under reduced pressure at 50-66Pa, and collecting a fraction at 106 ℃ to obtain colorless transparent liquid, namely a target product.
Preparing solvent-free epoxy paint:
the formula comprises the following components: see table 2.
TABLE 2
Sequentially placing hydrogenated epoxy resin, pigment filler, solvent and auxiliary agent into a charging bucket of a high-speed dispersing machine from liquid to powder and from low density to high density, dispersing and grinding for about 2 hours at a rotating speed of 3000r/min, filtering to obtain a solvent-free epoxy coating A component, wherein the fineness is below 50 mu m; adding quantitative propylene glycol methyl ether and cosolvent into alicyclic amine curing agent, and dispersing at 3000r/min for 30min to obtain solvent-free epoxy coating B component; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 7.5:1, so as to obtain the solvent-free epoxy coating with high weather resistance.
Example 3
Reactive diluent preparation:
35g of resorcinol monobenzoate and 40g of 40% sodium hydroxide solution by mass concentration are mixed, 0.012g of phase transfer catalyst benzyl triethyl ammonium chloride, 0.008g of polymerization inhibitor p-hydroxy anisole and 48g of water-carrying agent xylene are added, the temperature is controlled to 65 ℃ by heating with a constant-temperature oil bath, and excessive epichlorohydrin in a constant-pressure dropping funnel is slowly added into a flask in a dropwise manner under stirring for reaction. After 5h of reaction, removing sodium hydroxide, a phase transfer catalyst and other components by suction filtration, collecting filtrate, drying by anhydrous sodium carbonate, distilling at normal pressure to remove excessive epichlorohydrin, distilling under reduced pressure at 50-66Pa, and collecting a fraction at 108 ℃ to obtain colorless transparent liquid, namely a target product.
Preparing solvent-free epoxy paint:
the formula comprises the following components: see table 3.
TABLE 3 Table 3
Sequentially placing hydrogenated epoxy resin, pigment filler, solvent and auxiliary agent into a charging bucket of a high-speed dispersing machine from liquid to powder and from low density to high density, dispersing and grinding for about 2 hours at a rotating speed of 3000r/min, filtering to obtain a solvent-free epoxy coating A component, wherein the fineness is below 50 mu m; adding quantitative propylene glycol methyl ether and cosolvent into alicyclic amine curing agent, and dispersing at 3000r/min for 30min to obtain solvent-free epoxy coating B component; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 6.5:1, so as to obtain the solvent-free epoxy coating with high weather resistance.
Comparative example 1 (preparation of reactive diluent was not performed, resorcinol monobenzoate was directly added instead of reactive diluent when the A-component was prepared)
And (3) preparing a coating:
the formula comprises the following components: see table 4.
TABLE 4 Table 4
Sequentially placing hydrogenated epoxy resin, pigment filler, solvent and auxiliary agent into a charging bucket of a high-speed dispersing machine from liquid to powder and from low density to high density, dispersing and grinding for about 2 hours at a rotating speed of 3000r/min, and filtering to obtain a coating A component, wherein the fineness is below 50 mu m; adding quantitative propylene glycol methyl ether and cosolvent into alicyclic amine curing agent, dispersing for 30min at 3000r/min to obtain coating B component; when in use, the component A and the component B are uniformly mixed according to the mass ratio of 7:1, so as to obtain the coating.
Performance testing
The coatings prepared in examples 1-3 and comparative example 1 were applied to form a coating, and a manually accelerated ultraviolet aging test was performed, the results of which are shown in FIGS. 1-4. And the similar products (H16 epoxy paint, hengtai paint Co., ltd.) on the market are taken to form a coating for manual accelerated ultraviolet aging test, and the result is shown in figure 5. Reference standard for manual accelerated ultraviolet aging test: GB/T14522-2008.
As can be seen from FIGS. 1-3, the color of the coating prepared in examples 1-3 remained good after the artificial accelerated ultraviolet aging, and the coating was intact.
As can be seen from FIG. 4, the coating formed by the coating prepared in comparative example 1 is subject to discoloration, fading, cracking, chalking, and reduced gloss after artificially accelerated ultraviolet aging.
As can be seen from FIG. 5, the products of the same type on the market are subjected to artificially accelerated ultraviolet ageing to cause discoloration, fading, cracking, chalking, and reduced glossiness.
The hydrogenated epoxy resin source used in the present invention: tailLuck-ST 3000 resin, tokyo Kagaku Co., ltd.
The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A solvent-free epoxy coating with high weather resistance is characterized in that: comprises a component A and a component B;
the component A comprises epoxy resin and a reactive diluent; the component B comprises an alicyclic amine curing agent;
the chemical structural formula of the reactive diluent is as follows:
。
2. a high weatherability solvent-free epoxy coating as defined in claim 1, wherein: the component A comprises the following components in parts by weight: 30-40 parts of epoxy resin and 3-8 parts of reactive diluent.
3. A high weatherability solvent-free epoxy coating as defined in claim 1, wherein: the preparation reaction equation of the reactive diluent is as follows:
4. a solvent-free epoxy coating of claim 1 or 3, characterized in that: the preparation method of the reactive diluent comprises the following steps:
mixing resorcinol monobenzoate with alkali solution, adding phase transfer catalyst, polymerization inhibitor and water-carrying agent, dropwise adding epoxy chloropropane under the condition of hot stirring, reacting, taking filtrate, removing water, removing epoxy chloropropane, distilling, and collecting fraction to obtain the active diluent.
5. A high weatherability solvent-free epoxy coating as in claim 4 wherein: the phase transfer catalyst is benzyl triethyl ammonium chloride.
6. A high weatherability solvent-free epoxy coating as in claim 4 wherein: the polymerization inhibitor is p-hydroxyanisole.
7. A high weatherability solvent-free epoxy coating as in claim 4 wherein: the water-carrying agent is dimethylbenzene.
8. A high weatherability solvent-free epoxy coating as in claim 4 wherein: the temperature of the hot stirring is 65-75 ℃.
9. A high weatherability solvent-free epoxy coating as in claim 4 wherein: the reaction time is 2-5h.
10. A high weatherability solvent-free epoxy coating as in claim 4 wherein: the pressure of the distillation is 50-66Pa, and the temperature of the collected fraction is 105-108 ℃.
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| CN202211623931.8A CN116589901B (en) | 2022-12-16 | 2022-12-16 | Solvent-free epoxy coating with high weather resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211623931.8A CN116589901B (en) | 2022-12-16 | 2022-12-16 | Solvent-free epoxy coating with high weather resistance |
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| CN116589901A true CN116589901A (en) | 2023-08-15 |
| CN116589901B CN116589901B (en) | 2024-04-26 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103788735A (en) * | 2012-10-29 | 2014-05-14 | 中冶建筑研究总院有限公司 | Solvent-free flexible anticorrosion epoxy coating material, preparation method thereof and using method thereof |
| CN108624194A (en) * | 2018-06-04 | 2018-10-09 | 北京碧海舟腐蚀防护工业股份有限公司 | Solventless epoxy coating, the corrosion-inhibiting coating based on its preparation and its application |
| CN109836795A (en) * | 2019-02-01 | 2019-06-04 | 华政炎 | One kind is from capacity increasing modifying PET/PC alloy and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103788735A (en) * | 2012-10-29 | 2014-05-14 | 中冶建筑研究总院有限公司 | Solvent-free flexible anticorrosion epoxy coating material, preparation method thereof and using method thereof |
| CN108624194A (en) * | 2018-06-04 | 2018-10-09 | 北京碧海舟腐蚀防护工业股份有限公司 | Solventless epoxy coating, the corrosion-inhibiting coating based on its preparation and its application |
| CN109836795A (en) * | 2019-02-01 | 2019-06-04 | 华政炎 | One kind is from capacity increasing modifying PET/PC alloy and preparation method thereof |
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