CN117720844A - High corrosion-resistant water-based paint and spraying process thereof on surface of plastic electroplated product - Google Patents
High corrosion-resistant water-based paint and spraying process thereof on surface of plastic electroplated product Download PDFInfo
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- CN117720844A CN117720844A CN202311731411.3A CN202311731411A CN117720844A CN 117720844 A CN117720844 A CN 117720844A CN 202311731411 A CN202311731411 A CN 202311731411A CN 117720844 A CN117720844 A CN 117720844A
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- high corrosion
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- boron nitride
- resistant water
- based paint
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- 238000005260 corrosion Methods 0.000 title claims abstract description 72
- 230000007797 corrosion Effects 0.000 title claims abstract description 72
- 239000004033 plastic Substances 0.000 title claims abstract description 50
- 229920003023 plastic Polymers 0.000 title claims abstract description 50
- 238000005507 spraying Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 49
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical class N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 45
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- 239000000839 emulsion Substances 0.000 claims abstract description 28
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- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
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- 238000003756 stirring Methods 0.000 claims description 43
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- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 16
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- 238000005491 wire drawing Methods 0.000 claims description 15
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- -1 silane modified nano boron nitride Chemical class 0.000 claims description 13
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000005238 degreasing Methods 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 9
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 6
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- 229910021642 ultra pure water Inorganic materials 0.000 claims description 5
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- OSNILPMOSNGHLC-UHFFFAOYSA-N 1-[4-methoxy-3-(piperidin-1-ylmethyl)phenyl]ethanone Chemical compound COC1=CC=C(C(C)=O)C=C1CN1CCCCC1 OSNILPMOSNGHLC-UHFFFAOYSA-N 0.000 claims description 4
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 229910052797 bismuth Inorganic materials 0.000 claims description 4
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 4
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 4
- 239000011118 polyvinyl acetate Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 3
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 3
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229910000077 silane Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 2
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 claims 1
- 229940083037 simethicone Drugs 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 13
- 230000001070 adhesive effect Effects 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052582 BN Inorganic materials 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- SXAMGRAIZSSWIH-UHFFFAOYSA-N 2-[3-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,2,4-oxadiazol-5-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NOC(=N1)CC(=O)N1CC2=C(CC1)NN=N2 SXAMGRAIZSSWIH-UHFFFAOYSA-N 0.000 description 1
- IHCCLXNEEPMSIO-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 IHCCLXNEEPMSIO-UHFFFAOYSA-N 0.000 description 1
- YJLUBHOZZTYQIP-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)NN=N2 YJLUBHOZZTYQIP-UHFFFAOYSA-N 0.000 description 1
- FEWFXBUNENSNBQ-UHFFFAOYSA-N 2-hydroxyacrylic acid Chemical group OC(=C)C(O)=O FEWFXBUNENSNBQ-UHFFFAOYSA-N 0.000 description 1
- DFGKGUXTPFWHIX-UHFFFAOYSA-N 6-[2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]acetyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)C1=CC2=C(NC(O2)=O)C=C1 DFGKGUXTPFWHIX-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of coatings, in particular to a high corrosion-resistant water-based coating and a spraying process of the high corrosion-resistant water-based coating on the surface of a plastic electroplating product. The high corrosion resistant water-based paint comprises the following raw materials in parts by mass: acrylic resin, epoxy modified hydroxyl acrylic emulsion, propylene glycol methyl ether acetate, a leveling agent, a silane coupling agent, color paste, a defoaming agent, modified nano boron nitride and water, wherein the particle size of the modified nano boron nitride is 50nm. The high corrosion resistant water-based paint realizes good combination of the paint and the plastic electroplated layer by modifying nano boron nitride by the silane coupling agent and adding the epoxy modified hydroxyl acrylic emulsion, improves the adhesive force and corrosion resistance of the paint, simplifies the production process, reduces the production cost, improves the spraying efficiency, and has obvious technical advantages and application value.
Description
Technical Field
The application relates to the technical field of coatings, in particular to a high corrosion-resistant water-based coating and a spraying process of the high corrosion-resistant water-based coating on the surface of a plastic electroplating product.
Background
The aqueous coating is a coating using water as a solvent or as a dispersion medium. Because no organic solvent is needed, the paint has small influence on the environment and the working environment in use and is a relatively environment-friendly paint. Therefore, the water-based paint is a material worthy of popularization in the spraying industry. However, there are some parts such as plastic parts, metal parts and glass materials, the surfaces of which are hydrophobic, and the surfaces of which are difficult to combine with water-based paint. Limiting the application range of the water-based paint.
In order to spray water-based paint onto parts with hydrophobic surfaces, such as plastic plating, it is necessary to change the hydrophobic properties of the outer surface of the plastic plating. It is common practice to use ionization technology to improve the hydrophobicity of the outer surface of the plastic electroplated part or to spray a layer of chemical reagent on the outer surface of the plastic electroplated part to change the material properties. The ionization technology is utilized to easily cause deformation of plastic parts, the operation efficiency is low, and the yield of the subsequent spraying process is reduced; the chemical reagent can form new pollution, the environmental protection performance of the water-based paint can not be reflected, and the cost of the spraying process is increased. Therefore, a new water-based paint with excellent adhesive force and high corrosion and a spraying process thereof are required to be developed to meet the market demand.
Disclosure of Invention
In order to solve the technical problems in the prior art, the application provides a high corrosion-resistant water-based paint and a spraying process thereof on the surface of a plastic electroplating product.
In a first aspect, a high corrosion resistant water-based paint adopts the following technical scheme:
the high corrosion resistant water-based paint comprises the following raw materials in parts by mass: 10-12 parts of acrylic resin, 30-32 parts of epoxy modified hydroxy acrylic emulsion, 5-8 parts of propylene glycol methyl ether acetate, 0.2-0.4 part of flatting agent, 0.5-0.8 part of silane coupling agent, 6-8 parts of color paste, 1-2 parts of defoamer, 6-8 parts of modified nano boron nitride and 20-25 parts of water, wherein the particle size of the modified nano boron nitride is 50nm.
By adopting the technical scheme, the acrylic resin comprises the following components: as a primary resin matrix, basic properties and corrosion resistance of the coating are provided. Epoxy modified hydroxy acrylic emulsion: by adding the components, the adhesive force of the paint can be improved, and the need of spraying a primer before spraying the water-based paint on the plastic electroplated layer is reduced, so that the production process flow is simplified, the production cost is reduced, and the spraying efficiency is improved. Propylene glycol methyl ether acetate: as a diluent, the viscosity of the coating is adjusted to provide good coating properties. Leveling agent: by reducing the surface tension of the coating, better leveling is provided and the surface of the coating film is smoother. Silane coupling agent: the binding force between the paint and the plastic electroplated layer is improved and the adhesive force of the paint film is enhanced by chemical reaction with the plastic electroplated layer. Color paste: for adjusting the color of the paint, providing different color choices. Defoaming agent: is used for preventing bubbles from being generated in the coating process. Modified nano boron nitride: the gamma-aminopropyl triethoxy silane nanometer boron nitride is used for modification, so that the dispersibility and compatibility of the nanometer boron nitride can be improved, a three-dimensional network structure is formed in the coating, and the corrosion performance of the coating and the binding force between the coating and a plastic electroplated layer are improved. Through the synergistic effect of the components, the high corrosion resistant water-based paint has excellent comprehensive performance, excellent binding force and corrosion resistance, and is very suitable for kitchen and bathroom furniture products.
Preferably, the preparation method of the epoxy modified hydroxyl acrylic emulsion comprises the following steps: 200g of epoxy resin E-44 and 400g of n-propanol are added into a reactor, stirring is carried out, the stirring speed is 300r/min, the temperature is raised to 83 ℃, 880g of methyl methacrylate, 200g of butyl acrylate, 200g of hydroxyethyl acrylate, 200g of acrylic acid and 40g of azobisisobutyronitrile are weighed, uniformly mixed and transferred into a constant pressure dropping funnel, then the mixture is dropped into a reaction bottle in 6h under the protection of nitrogen, after 2h of reaction at 85 ℃, 80g of gamma-methacryloxypropyl trimethoxysilane is added, the reaction is continued for 2h, the reaction is stopped, isopropanol is distilled out under reduced pressure at 75 ℃, 40g of triethylamine and 2120g of distilled water are added under the stirring state, and after 50min of stirring is carried out continuously at 400r/min, the mixture is discharged, so that the epoxy modified hydroxy acrylic emulsion with the solid content of 47% is prepared.
By adopting the technical scheme, the epoxy modified hydroxyl acrylic emulsion prepared by the method is obtained by reacting with acrylic resin and other monomers. In the curing process of the emulsion, hydroxyl acrylic acid groups react with acrylic resin to form a crosslinked structure, so that the adhesive force of the coating is improved.
Preferably, the preparation method of the modified nano boron nitride comprises the following steps:
s31, mixing 500g of nano boron nitride with 200g of sodium hydroxide solution with the mass concentration of 200g/L, transferring to a reactor, placing in a water bath kettle, stirring at the speed of 200r/min for 12 hours, performing suction filtration, and placing in a vacuum drying oven for drying for 12 hours to obtain hydroxylated nano boron nitride;
s32, uniformly mixing 500g of hydroxylated nano boron nitride with 200g of toluene in a reactor, dropwise adding 8g of gamma-aminopropyl triethoxysilane, keeping the temperature of 45 ℃ and the stirring rotation speed of 100r/min unchanged after the dropwise adding is finished, carrying out suction filtration after reacting for 12 hours, and carrying out vacuum drying to obtain the silane modified nano boron nitride.
Through adopting above-mentioned technical scheme, the modified nanometer boron nitride of this application: the gamma-aminopropyl triethoxy silane nanometer boron nitride is used for modification, so that the dispersibility and compatibility of the nanometer boron nitride can be improved, a three-dimensional network structure is formed in the coating, and the corrosion performance of the coating and the binding force between the coating and a plastic electroplated layer are improved.
Preferably, the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane according to a mass ratio of 1:3-4.
By adopting the technical scheme, in the high corrosion resistant water-based paint, the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane according to the mass ratio of 1:3-4. The silane coupling agent plays the following roles and synergies in the coating: the binding force between the paint and the plastic electroplated layer is improved: the characteristic of the silane coupling agent enables the silane coupling agent to react with the resin matrix in the paint and the surface of the plastic electroplated layer to form firm bonding, thereby improving the binding force and the adhesive force between the paint and the plastic electroplated layer. Promoting the hardening reaction: the silane coupling agent can be used as a cross-linking agent catalyst to promote the hardening reaction of the resin matrix in the coating and improve the folding resistance and the wear resistance of the coating. And the corrosion resistance is improved: the introduction of the silane coupling agent can increase the corrosion resistance of the coating, form a protective film and effectively resist the corrosion of corrosive media such as acid and alkali. The binding force and corrosion resistance of the high corrosion resistance water-based paint can be further enhanced by adding the silane coupling agent, so that the coating is more durable and reliable, and kitchen and bathroom furniture products are effectively protected.
Preferably, the leveling agent is one of polyether modified polydimethylsiloxane copolymer and dimethylsiloxane.
Preferably, the color paste is one of phthalocyanine blue color paste, bismuth vanadate color paste and benzidine yellow color paste.
Preferably, the defoaming agent is at least one of polyvinyl acetate, benzotriester and dimethyl silicone oil.
In a second aspect, the present application provides a method for preparing a highly corrosion-resistant aqueous coating, which adopts the following technical scheme:
the preparation method of the high corrosion resistant water-based paint adopts the raw materials of the high corrosion resistant water-based paint, and comprises the following steps:
s81, adding epoxy modified hydroxy acrylic emulsion, modified nano boron nitride and water into a reactor according to the parts by weight, regulating the stirring speed to 400r/min, and stirring for 15 minutes to obtain a mixed solution A;
s82, adding acrylic resin and propylene glycol methyl ether acetate into the mixed solution A according to the parts by weight, and uniformly stirring to obtain a mixed solution B;
s83, respectively adding the leveling agent, the silane coupling agent, the color paste and the defoaming agent into the mixed solution B according to the parts by weight, and adjusting the stirring speed to 500r/min and the stirring time to 20min to prepare the high corrosion resistant water-based paint.
By adopting the technical scheme, the high corrosion resistant water-based paint of the application realizes good combination of the paint and a plastic electroplated layer by modifying nano boron nitride by the silane coupling agent and adding the epoxy modified hydroxy acrylic emulsion, improves the adhesive force and corrosion resistance of the paint, simplifies the production process, reduces the production cost, improves the spraying efficiency, and has obvious technical advantages and application value.
In a third aspect, the present application provides a spraying process on a surface of a plastic electroplated product, which adopts the following technical scheme: a spraying process for the surface of a plastic electroplated product comprises the following steps:
s91, carrying out ultrasonic degreasing on a plastic electroplating wire drawing product, and carrying out ultrasonic degreasing for 3-5 minutes at the temperature of 55 ℃;
s92, cleaning the deoiled plastic electroplating wiredrawing product for 3 times by pure water, neutralizing by weak acid for 0.5 min, cleaning by ultrapure water for 3 times, and drying at 60 ℃ for 50 min;
s93, conveying the dried plastic electroplating wiredrawing product to an automatic paint spraying line, spraying by adopting high corrosion resistant water-based paint, controlling the thickness of the coating to be 20-25 micrometers, and then leveling, drying and solidifying to obtain a finished product.
Preferably, in step S93, the leveling temperature is 20-25 ℃, the time is 8-12 minutes, the drying and curing temperature is 60-65 ℃ and the time is 45-50 minutes.
Through adopting above-mentioned technical scheme, this application improves the adhesive force of coating through adopting spraying high corrosion resistant water paint, reduces plastics electroplated coating and need spray a priming paint before spraying water paint, plays the purpose that reduces spraying technological process, reduction in production cost, promotes spraying efficiency.
In summary, the beneficial technical effects of the present application are:
1. the dispersibility and the compatibility of the nanometer boron nitride are improved: nano boron nitride tends to be difficult to disperse uniformly in the coating and is compatible with other ingredients. The silane coupling agent is adopted to modify the nano boron nitride, so that the dispersibility and compatibility of the nano boron nitride can be greatly improved, a three-dimensional network structure is formed in the coating, and the corrosion resistance of the coating is further improved.
2. The binding force between the paint and the plastic electroplated layer is improved: the silane coupling agent is used as a bonding agent, and can be subjected to chemical reaction with the plastic electroplated layer to form firm bonding, so that the bonding force between the coating and the plastic electroplated layer is improved. When the paint is sprayed on the plastic electroplated layer, no extra primer layer is needed, the coating process is simplified, the production cost is reduced, and the spraying efficiency is improved.
3. Improving the adhesive force of the paint: by adding the epoxy modified hydroxyl acrylic emulsion, the adhesive force of the coating can be improved, so that the coating can be better adhered to the surfaces of various substrates, including plastic electroplated layers. This further enhances the binding force and corrosion resistance of the paint to the plastic plating.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustration of the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Preparation example 1: preparation of epoxy modified hydroxy acrylic emulsion
The preparation method of the epoxy modified hydroxyl acrylic emulsion comprises the following steps: 200g of epoxy resin E-44 and 400g of n-propanol are added into a reactor, stirring is carried out, the stirring speed is 300r/min, the temperature is raised to 83 ℃, 880g of methyl methacrylate, 200g of butyl acrylate, 200g of hydroxyethyl acrylate, 200g of acrylic acid and 40g of azobisisobutyronitrile are weighed, uniformly mixed and transferred into a constant pressure dropping funnel, then the mixture is dropped into a reaction bottle in 6h under the protection of nitrogen, after 2h of reaction at 85 ℃, 80g of gamma-methacryloxypropyl trimethoxysilane is added, the reaction is continued for 2h, the reaction is stopped, isopropanol is distilled out under reduced pressure at 75 ℃, 40g of triethylamine and 2120g of distilled water are added under the stirring state, and after 50min of stirring is carried out continuously at 400r/min, the mixture is discharged, so that the epoxy modified hydroxy acrylic emulsion with the solid content of 47% is prepared.
Preparation example 2:
the preparation method of the modified nano boron nitride comprises the following steps:
s31, mixing 500g of nano boron nitride with 200g of sodium hydroxide solution with the mass concentration of 200g/L, transferring to a reactor, placing in a water bath kettle, stirring at the speed of 200r/min for 12 hours, performing suction filtration, and placing in a vacuum drying oven for drying for 12 hours to obtain hydroxylated nano boron nitride;
s32, uniformly mixing 500g of hydroxylated nano boron nitride with 200g of toluene in a reactor, dropwise adding 8g of gamma-aminopropyl triethoxysilane, keeping the temperature of 45 ℃ and the stirring rotation speed of 100r/min unchanged after the dropwise adding is finished, carrying out suction filtration after reacting for 12 hours, and carrying out vacuum drying to obtain the silane modified nano boron nitride.
Example 1
The high corrosion resistant water-based paint comprises the following raw materials in parts by mass: 10 parts of acrylic resin, 30 parts of epoxy modified hydroxy acrylic emulsion, 5 parts of propylene glycol methyl ether acetate, 0.2 part of polyether modified polydimethylsiloxane copolymer, 0.5 part of silane coupling agent, 6 parts of phthalocyanine blue paste, 1 part of polyvinyl acetate, 6 parts of modified nano boron nitride and 20 parts of water, wherein the particle size of the modified nano boron nitride is 50nm, and the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane according to a mass part ratio of 1:3.
The preparation method of the high corrosion resistant water-based paint adopts the raw materials of the high corrosion resistant water-based paint, and comprises the following steps:
s81, adding epoxy modified hydroxy acrylic emulsion, modified nano boron nitride and water into a reactor according to the parts by weight, regulating the stirring speed to 400r/min, and stirring for 15 minutes to obtain a mixed solution A;
s82, adding acrylic resin and propylene glycol methyl ether acetate into the mixed solution A according to the parts by weight, and uniformly stirring to obtain a mixed solution B;
s83, respectively adding the polyether modified polydimethylsiloxane copolymer, the silane coupling agent, the phthalocyanine blue paste and the polyvinyl acetate into the mixed solution B according to the parts by weight, and regulating the stirring speed to 500r/min and the stirring time to 20min to prepare the high corrosion-resistant water-based paint.
Example 2
The high corrosion resistant water-based paint comprises the following raw materials in parts by mass: 12 parts of acrylic resin, 32 parts of epoxy modified hydroxy acrylic emulsion, 8 parts of propylene glycol methyl ether acetate, 0.4 part of dimethyl siloxane, 0.8 part of silane coupling agent, 8 parts of bismuth vanadate color paste, 2 parts of benzotriacid ester, 8 parts of modified nano boron nitride and 25 parts of water, wherein the particle size of the modified nano boron nitride is 50nm, and the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane according to a mass part ratio of 1:4.
The preparation method of the high corrosion resistant water-based paint adopts the raw materials of the high corrosion resistant water-based paint, and comprises the following steps:
s81, adding epoxy modified hydroxy acrylic emulsion, modified nano boron nitride and water into a reactor according to the parts by weight, regulating the stirring speed to 400r/min, and stirring for 15 minutes to obtain a mixed solution A;
s82, adding acrylic resin and propylene glycol methyl ether acetate into the mixed solution A according to the parts by weight, and uniformly stirring to obtain a mixed solution B;
s83, respectively adding the dimethyl siloxane, the silane coupling agent, the bismuth vanadate color paste and the benzotriazole into the mixed solution B according to the parts by weight, and adjusting the stirring speed to 500r/min and the stirring time to 20min to prepare the high corrosion resistant water-based paint.
Example 3
The high corrosion resistant water-based paint comprises the following raw materials in parts by mass: 11 parts of acrylic resin, 31 parts of epoxy modified hydroxy acrylic emulsion, 7 parts of propylene glycol methyl ether acetate, 0.3 part of dimethyl siloxane, 0.7 part of silane coupling agent, 7 parts of benzidine yellow paste, 1.5 parts of dimethyl silicone oil, 7 parts of modified nano boron nitride and 23 parts of water, wherein the particle size of the modified nano boron nitride is 50nm, and the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane according to a mass part ratio of 1:3.5.
The preparation method of the high corrosion resistant water-based paint adopts the raw materials of the high corrosion resistant water-based paint, and comprises the following steps:
s81, adding epoxy modified hydroxy acrylic emulsion, modified nano boron nitride and water into a reactor according to the parts by weight, regulating the stirring speed to 400r/min, and stirring for 15 minutes to obtain a mixed solution A;
s82, adding acrylic resin and propylene glycol methyl ether acetate into the mixed solution A according to the parts by weight, and uniformly stirring to obtain a mixed solution B;
s83, adding the dimethyl siloxane, the silane coupling agent, the benzidine yellow paste and the dimethyl silicone oil into the mixed solution B according to the parts by weight, and adjusting the stirring speed to 500r/min and the stirring time to 20min to prepare the high corrosion resistant water-based paint.
Comparative example 1
The same as in example 3, except that: the epoxy modified hydroxy acrylic emulsion of the present application was replaced with an equivalent amount of pure acrylate emulsion.
Comparative example 2
The same as in example 3, except that: an equivalent amount of nano boron nitride is used to replace the modified nano boron nitride of the present application.
Comparative example 3
The same as in example 3, except that: the equivalent amount of gamma-aminopropyl triethoxy silane is adopted to replace silane coupling agent to be selected from the composition of gamma-aminopropyl triethoxy silane and 3-aminopropyl trimethoxy silane according to the mass ratio of 1:3.5.
Comparative example 4
The same as in example 3, except that: the silane coupling agent is replaced by equivalent 3-aminopropyl trimethoxy silane, and the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxy silane and 3-aminopropyl trimethoxy silane according to the mass ratio of 1:3.5.
Application example 1
A spraying process for the surface of a plastic electroplated product comprises the following steps:
s91, carrying out ultrasonic degreasing on a plastic electroplating wire drawing product, and carrying out ultrasonic degreasing for 3 minutes at the temperature of 55 ℃;
s92, cleaning the deoiled plastic electroplating wiredrawing product for 3 times by pure water, neutralizing by weak acid for 0.5 min, cleaning by ultrapure water for 3 times, and drying at 60 ℃ for 50 min;
and S93, conveying the dried plastic electroplating wiredrawing product to an automatic paint spraying line, spraying the high corrosion resistant water-based paint prepared in the embodiment 1, controlling the thickness of the coating to be 20 microns, leveling, drying and curing at 20 ℃ for 12 minutes and at 60 ℃ for 50 minutes to obtain a finished product.
Application example 2
A spraying process for the surface of a plastic electroplated product comprises the following steps:
s91, carrying out ultrasonic degreasing on a plastic electroplating wire drawing product, and carrying out ultrasonic degreasing for 5 minutes at the temperature of 55 ℃;
s92, cleaning the deoiled plastic electroplating wiredrawing product for 3 times by pure water, neutralizing by weak acid for 0.5 min, cleaning by ultrapure water for 3 times, and drying at 60 ℃ for 50 min;
and S93, conveying the dried plastic electroplating wiredrawing product to an automatic paint spraying line, spraying the high corrosion resistant water-based paint prepared in the embodiment 2, controlling the thickness of the coating to be 25 microns, leveling, drying and curing at the temperature of 25 ℃ for 8 minutes and at the temperature of 65 ℃ for 45 minutes to obtain a finished product.
Application example 3
A spraying process for the surface of a plastic electroplated product comprises the following steps:
s91, carrying out ultrasonic degreasing on a plastic electroplating wire drawing product, and carrying out ultrasonic degreasing for 4 minutes at the temperature of 55 ℃;
s92, cleaning the deoiled plastic electroplating wiredrawing product for 3 times by pure water, neutralizing by weak acid for 0.5 min, cleaning by ultrapure water for 3 times, and drying at 60 ℃ for 50 min;
s93, conveying the dried plastic electroplating wiredrawing product to an automatic paint spraying line, spraying the high corrosion resistant water-based paint prepared in the embodiment 3, controlling the thickness of the coating to be 20-25 microns, leveling, drying and curing at the temperature of 23 ℃ for 10 minutes, and drying and curing at the temperature of 63 ℃ for 48 minutes to obtain a finished product.
Application example 4
The same as in application example 3, except that: the high corrosion resistant aqueous coating prepared in comparative example 1 was used for spray coating.
Application example 5
The same as in application example 3, except that: the high corrosion resistant aqueous coating prepared in comparative example 2 was used for spray coating.
Application example 6
The same as in application example 3, except that: the high corrosion resistant aqueous coating prepared in comparative example 3 was used for spray coating.
Application example 7
The same as in application example 3, except that: the high corrosion resistant aqueous coating prepared in comparative example 4 was applied by spraying.
Performance testing
Taking the finished products obtained by each application example respectively for performance test, and the results are shown in table 1;
adhesion test: the detection is carried out according to GB/T9286-1998, cross-cut test of paint films of color paint and varnish, the evaluation result is classified into 0-5 grades, wherein 0 is the best, and 5 is the worst;
paint film hardness: measuring pencil hardness of the paint layer by using GB/T6739-2006;
neutral salt spray test: the treated steel was subjected to a neutral salt spray test of 5% sodium chloride at 37℃for 480 hours, and whether rust was generated was observed.
Table 1 performance test table
| Project | Adhesion (grade) | Hardness of paint film | Neutral salt fog |
| Application example 1 | 0 | 4H | Rust-free spot |
| Application example 2 | 0 | 4H | Rust-free spot |
| Application example 3 | 0 | 4H | Rust-free spot |
| Application example 4 | 3 | 2H | Slight rust mark with foaming |
| Application example 5 | 3 | 1H | Slight rust mark, no foaming |
| Application example 6 | 1 | 3H | Rust-free spot |
| Application example 7 | 1 | 3H | Rust-free spot |
It can be seen from the combination of application example 1-application example 3 and the combination of table 1 that the highly corrosion-resistant aqueous coating material of the present application has excellent comprehensive properties, in particular, excellent adhesion and corrosion resistance. The high corrosion resistant water-based paint realizes good combination of paint and plastic electroplated coating by modifying nano boron nitride by the silane coupling agent and adding epoxy modified hydroxy acrylic emulsion and the silane coupling agent, improves the adhesive force and corrosion resistance of the paint, simplifies the production process, reduces the production cost, improves the spraying efficiency, and has obvious technical advantages and application value.
It can be seen from the combination of application examples 3 and 4 and the combination of table 1 that the epoxy modified hydroxy acrylic emulsion of the present application can significantly improve the adhesion and corrosion resistance of the coating.
It can be seen from the combination of application examples 3 and 5 and the combination of table 1 that the modified nano boron nitride can significantly improve the adhesive force and corrosion resistance of the coating.
As can be seen from the combination of application example 3 and application example 6-application example 7 and the combination of table 1, the silane coupling agent is selected from the composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane according to the mass part ratio of 1:3.5, and the adhesive force and corrosion resistance of the coating can be further improved by utilizing the synergistic effect between the gamma-aminopropyl triethoxysilane and the 3-aminopropyl trimethoxysilane.
The foregoing embodiments are merely for illustrating the technical solution of the present application and are not intended to be limiting, and although the foregoing embodiments specifically illustrate the present application, it should be understood by those skilled in the relevant art that modifications and equivalents can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application.
Claims (10)
1. The high corrosion-resistant water-based paint is characterized by comprising the following raw materials in parts by weight: 10-12 parts of acrylic resin, 30-32 parts of epoxy modified hydroxy acrylic emulsion, 5-8 parts of propylene glycol methyl ether acetate, 0.2-0.4 part of flatting agent, 0.5-0.8 part of silane coupling agent, 6-8 parts of color paste, 1-2 parts of defoamer, 6-8 parts of modified nano boron nitride and 20-25 parts of water, wherein the particle size of the modified nano boron nitride is 50nm.
2. The high corrosion resistant water based paint according to claim 1, wherein the preparation method of the epoxy modified hydroxyl acrylic emulsion is as follows: 200g of epoxy resin E-44 and 400g of n-propanol are added into a reactor, stirring is carried out, the stirring speed is 300r/min, the temperature is raised to 83 ℃, 880g of methyl methacrylate, 200g of butyl acrylate, 200g of hydroxyethyl acrylate, 200g of acrylic acid and 40g of azobisisobutyronitrile are weighed, uniformly mixed and transferred into a constant pressure dropping funnel, then the mixture is dropped into a reaction bottle in 6h under the protection of nitrogen, after 2h of reaction at 85 ℃, 80g of gamma-methacryloxypropyl trimethoxysilane is added, the reaction is continued for 2h, the reaction is stopped, isopropanol is distilled out under reduced pressure at 75 ℃, 40g of triethylamine and 2120g of distilled water are added under the stirring state, and after 50min of stirring is carried out continuously at 400r/min, the mixture is discharged, so that the epoxy modified hydroxy acrylic emulsion with the solid content of 47% is prepared.
3. The high corrosion resistant water based paint as claimed in claim 1, wherein the preparation method of the modified nano boron nitride comprises the following steps:
s31, mixing 500g of nano boron nitride with 200g of sodium hydroxide solution with the mass concentration of 200g/L, transferring to a reactor, placing in a water bath kettle, stirring at the speed of 200r/min for 12 hours, performing suction filtration, and placing in a vacuum drying oven for drying for 12 hours to obtain hydroxylated nano boron nitride;
s32, uniformly mixing 500g of hydroxylated nano boron nitride with 200g of toluene in a reactor, dropwise adding 8g of gamma-aminopropyl triethoxysilane, keeping the temperature of 45 ℃ and the stirring rotation speed of 100r/min unchanged after the dropwise adding is finished, carrying out suction filtration after reacting for 12 hours, and carrying out vacuum drying to obtain the silane modified nano boron nitride.
4. The high corrosion resistant water-based paint according to claim 1, wherein the silane coupling agent is selected from a composition of gamma-aminopropyl triethoxysilane and 3-aminopropyl trimethoxysilane in a mass ratio of 1:3-4.
5. The high corrosion resistant water based paint according to claim 1, wherein the leveling agent is one of polyether modified polydimethylsiloxane copolymer and dimethylsiloxane.
6. The high corrosion resistant aqueous coating of claim 1, wherein the color paste is one of phthalocyanine blue color paste, bismuth vanadate color paste, and benzidine yellow color paste.
7. The high corrosion resistant water based paint according to claim 1, wherein said defoaming agent is at least one of polyvinyl acetate, benzotriester and simethicone.
8. A method for preparing the high corrosion resistant water-based paint, which is characterized by adopting the raw materials of the high corrosion resistant water-based paint as claimed in any one of claims 1 to 7, and comprising the following steps:
s81, adding epoxy modified hydroxy acrylic emulsion, modified nano boron nitride and water into a reactor according to the parts by weight, regulating the stirring speed to 400r/min, and stirring for 15 minutes to obtain a mixed solution A;
s82, adding acrylic resin and propylene glycol methyl ether acetate into the mixed solution A according to the parts by weight, and uniformly stirring to obtain a mixed solution B;
s83, respectively adding the leveling agent, the silane coupling agent, the color paste and the defoaming agent into the mixed solution B according to the parts by weight, and adjusting the stirring speed to 500r/min and the stirring time to 20min to prepare the high corrosion resistant water-based paint.
9. A spraying process for the surface of a plastic electroplated product is characterized in that the coating prepared by the preparation method of the high corrosion resistant water-based coating in claim 8 comprises the following steps:
s91, carrying out ultrasonic degreasing on a plastic electroplating wire drawing product, and carrying out ultrasonic degreasing for 3-5 minutes at the temperature of 55 ℃;
s92, cleaning the deoiled plastic electroplating wiredrawing product for 3 times by pure water, neutralizing by weak acid for 0.5 min, cleaning by ultrapure water for 3 times, and drying at 60 ℃ for 50 min;
s93, conveying the dried plastic electroplating wiredrawing product to an automatic paint spraying line, spraying by adopting high corrosion resistant water-based paint, controlling the thickness of the coating to be 20-25 micrometers, and then leveling, drying and solidifying to obtain a finished product.
10. The process according to claim 9, wherein in step S93, the leveling temperature is 20-25 ℃ for 8-12 minutes, the drying and curing temperature is 60-65 ℃ for 45-50 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311731411.3A CN117720844A (en) | 2023-12-15 | 2023-12-15 | High corrosion-resistant water-based paint and spraying process thereof on surface of plastic electroplated product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311731411.3A CN117720844A (en) | 2023-12-15 | 2023-12-15 | High corrosion-resistant water-based paint and spraying process thereof on surface of plastic electroplated product |
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| CN117720844A true CN117720844A (en) | 2024-03-19 |
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| CN202311731411.3A Pending CN117720844A (en) | 2023-12-15 | 2023-12-15 | High corrosion-resistant water-based paint and spraying process thereof on surface of plastic electroplated product |
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| CN (1) | CN117720844A (en) |
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