CN111019441B - Color paste for cathode electrophoretic paint and preparation method thereof - Google Patents
Color paste for cathode electrophoretic paint and preparation method thereof Download PDFInfo
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- CN111019441B CN111019441B CN201911345585.XA CN201911345585A CN111019441B CN 111019441 B CN111019441 B CN 111019441B CN 201911345585 A CN201911345585 A CN 201911345585A CN 111019441 B CN111019441 B CN 111019441B
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- 239000003973 paint Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000003822 epoxy resin Substances 0.000 claims abstract description 68
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 68
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 60
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 57
- FDIPWBUDOCPIMH-UHFFFAOYSA-N 2-decylphenol Chemical compound CCCCCCCCCCC1=CC=CC=C1O FDIPWBUDOCPIMH-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000006229 carbon black Substances 0.000 claims abstract description 43
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims abstract description 38
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 36
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000001913 cellulose Substances 0.000 claims abstract description 19
- 229920002678 cellulose Polymers 0.000 claims abstract description 19
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 19
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 239000004593 Epoxy Substances 0.000 claims description 24
- 239000000080 wetting agent Substances 0.000 claims description 20
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 13
- 229930185605 Bisphenol Natural products 0.000 claims description 13
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 13
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims description 13
- 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 13
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 claims description 13
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 239000008096 xylene Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 8
- 239000012752 auxiliary agent Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 150000003839 salts Chemical class 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 4
- 238000010422 painting Methods 0.000 abstract 1
- 235000019241 carbon black Nutrition 0.000 description 39
- 238000006243 chemical reaction Methods 0.000 description 19
- 239000011259 mixed solution Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 11
- 239000000839 emulsion Substances 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 9
- 238000012986 modification Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 8
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 7
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 description 5
- 238000005576 amination reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 5
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002715 modification method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001962 electrophoresis Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 1
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910014314 BYK190 Inorganic materials 0.000 description 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 150000004658 ketimines Chemical class 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000012360 testing method Methods 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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
- C09D17/005—Carbon black
-
- 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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/001—Pigment pastes, e.g. for mixing in paints in aqueous medium
-
- 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
- C09D17/00—Pigment pastes, e.g. for mixing in paints
- C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
- C09D17/007—Metal oxide
- C09D17/008—Titanium dioxide
-
- 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
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4488—Cathodic paints
- C09D5/4492—Cathodic paints containing special additives, e.g. grinding agents
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides color paste for cathode electrophoretic paint and a preparation method thereof. The color paste for the cathode electrophoretic paint comprises the following raw materials in parts by weight: 15-30 parts of decyl phenol modified epoxy resin, 3-10 parts of butyl cellosolve, 3-10 parts of ethylene glycol, 1-6 parts of butanol, 0.1-2 parts of carbon black, 7-14 parts of hydroxy cellulose, 1-6 parts of iron oxide, 0.5-2 parts of acetic acid and 12-25 parts of titanium dioxide. According to the invention, the decyl phenol modified epoxy resin is mixed with a specific solvent and other components, so that the salt spray resistance and the throwing power of the cathode electrophoretic paint prepared from the color paste consisting of the raw materials are effectively improved, and the electrophoretic painting productivity is improved.
Description
Technical Field
The invention relates to the technical field of coatings, and in particular relates to color paste for a cathode electrophoretic paint and a preparation method thereof.
Background
The electrophoretic paint is a water-based paint, also called electrophoretic paint. Electrophoresis is one of the most effective methods for coating metal workpieces, and is a coating construction technology developed in the 60 s. The cathode electrophoretic coating has the advantages of excellent corrosion resistance, high throwing power, high leveling property, high coating automation degree, small environmental pollution and the like, and is increasingly paid more attention. With the development of electrophoretic coating technology, the requirements for the performance of electrophoretic coatings are higher and higher, especially when the surfaces containing irregular shapes such as concave bodies, cavities, gaps and the like are coated. The index for judging whether the cathode electrophoretic paint enables the concave depth, the gap or the shielded part of the coated workpiece to be uniformly coated with the paint film is the throwing power, wherein the higher the throwing power is, the more uniform the thickness of the paint film coated on the coated workpiece is, and the higher the overall corrosion resistance of the workpiece is. In addition, the throwing power is improved, the consumption of the coating can be effectively reduced, and the cost is saved.
The cathode electrophoretic paint is prepared by mixing cathode electrophoretic paint color paste and cathode electrophoretic paint emulsion. In the cathode electrophoretic coating, color paste is also one of the key factors for determining the performance of a paint film. The color paste for the cathode electrophoretic paint disclosed in the prior art has low uniformity and low stability, so that the produced cathode electrophoretic paint has poor performances such as throwing power and the like, and cannot meet the requirements of coating industry in some existing industries.
Disclosure of Invention
The first purpose of the invention is to provide a color paste for cathode electrophoretic paint. The color paste for the cathode electrophoretic paint comprises the following raw materials in parts by weight: 15-30 parts of decyl phenol modified epoxy resin, 3-10 parts of butyl cellosolve, 3-10 parts of ethylene glycol, 1-6 parts of butanol, 0.1-2 parts of carbon black, 7-14 parts of hydroxy cellulose, 1-6 parts of iron oxide, 0.5-2 parts of acetic acid and 12-25 parts of titanium dioxide.
According to the invention, the decyl phenol modified epoxy resin, ethylene glycol monobutyl ether, ethylene glycol, butanol, carbon black, hydroxy cellulose, ferric oxide, acetic acid and titanium dioxide are mixed to prepare the color paste according to a specific proportion, so that the uniformity and stability of the color paste can be effectively improved, and the throwing power of the electrophoretic paint prepared by mixing the color paste with the emulsion is also effectively improved.
In a preferred embodiment of the invention, the color paste for the cathode electrophoretic paint comprises the following raw materials in parts by weight: 20-25 parts of decyl phenol modified epoxy resin, 5-6 parts of butyl cellosolve, 5-6 parts of ethylene glycol, 3-4 parts of butanol, 1-1.2 parts of carbon black, 10-12 parts of hydroxy cellulose, 3-4 parts of iron oxide, 0.7-0.8 part of acetic acid and 14-15 parts of titanium dioxide.
In a preferred embodiment of the invention, the weight ratio of the decylphenol to the epoxy resin in the decylphenol-modified epoxy resin is 1 (3-10), preferably 1 (5-6).
In the present invention, the epoxy resin may be modified with decylphenol using a method commonly used in the art, preferably, the modification method comprises the steps of: mixing epoxy resin, bisphenol, decylphenol, xylene and dimethylbenzylamine, reacting at 130-140 ℃, cooling to 80-90 ℃ when the epoxy value is 0.16, adding methyl isobutyl ketone, N-methylethanolamine and monoethanolamine, completely reacting at 110 +/-5 ℃, and removing the solvent to obtain the epoxy resin. In the modification method, the amination agent is preferably N-methylethanolamine and monoethanolamine in amination reaction, and a large number of researches show that the color paste obtained by using the amination agent has better performance than other amination agents (such as one or other combinations of monoethanolamine, diethanolamine, methyl monoethanolamine, N-dimethylethanolamine, polyamide and ketimine). In this modification method, the solvent for the amination reaction is preferably methyl isobutyl ketone.
In a preferred embodiment of the present invention, the weight ratio of the epoxy resin, the bisphenol, the decylphenol, the xylene and the dimethylbenzylamine is (5-6): (0.5-0.55): 1, (0.5-0.6): 0.04-0.05): 0.8-0.9): 0.3-0.4): 0.2-0.3.
In a preferred embodiment of the present invention, the epoxy resin of the present invention may be one or more selected from E-54 (epoxy value of 0.52 to 0.56), E-51 (epoxy value of 0.48 to 0.54), E-44 (epoxy value of 0.41 to 0.47), E-20 (epoxy value of 0.18 to 0.22), E-12 (epoxy value of 0.08 to 0.12), E-10 (epoxy value of 0.04 to 0.07), preferably E-54 and E-51; wherein the mass ratio of E-54 to E-51 is preferably (4-5): 1.
In a preferred embodiment of the invention, the raw materials of the color paste for the cathode electrophoretic paint further comprise, by weight, 0.1 to 0.5 part of a dispersing aid and 0.1 to 0.5 part of a base material wetting agent, and preferably further comprise 0.1 to 0.2 part of a dispersing aid and 0.1 to 0.2 part of a base material wetting agent. Namely, the color paste for the cathode electrophoretic paint comprises the following raw materials in parts by weight: 15-30 parts of decyl phenol modified epoxy resin, 3-10 parts of butyl cellosolve, 3-10 parts of ethylene glycol, 1-6 parts of butanol, 0.1-2 parts of carbon black, 7-14 parts of hydroxy cellulose, 1-6 parts of iron oxide, 0.5-2 parts of acetic acid, 12-25 parts of titanium dioxide, 0.1-0.5 part of dispersing auxiliary agent and 0.1-0.5 part of base material wetting agent. Further preferably, the color paste for the cathode electrophoretic paint comprises the following raw materials in parts by weight: 20-25 parts of decyl phenol modified epoxy resin, 5-6 parts of butyl cellosolve, 5-6 parts of ethylene glycol, 3-4 parts of butanol, 1-1.2 parts of carbon black, 10-12 parts of hydroxy cellulose, 3-4 parts of iron oxide, 0.7-0.8 part of acetic acid, 14-15 parts of titanium dioxide, 0.1-0.2 part of dispersing auxiliary agent and 0.1-0.2 part of base material wetting agent.
The dispersing aid and the substrate wetting agent can be dispersing aids and substrate wetting agents commonly used in the field, and in the invention, the dispersing aid is one or more of TEGO760W, TEGO740W, BYK110, BYK130, BYK161, BYK163 and BYK 198; preferably TEGO 740W. The substrate wetting agent is one or more of TEGO245, TEGO270, TEGO280, TEGO4100, TEGO4200, TEGO500, BYK180, BYK190, BYK184, BYK155, BYK154, BYK2000, BYK2001, BYK2010 and BYK 2020; preferably TEGO 280.
The carbon black of the present invention may be one or more of carbon blacks commonly used in the art, such as Mitsubishi MA-7 type carbon black, cabot S90B type carbon black, cabot M1300 type carbon black, cabot M700 type carbon black, cabot M800 type carbon black, preferably cabot M700 type carbon black.
The raw materials of the color paste for the cathode electrophoretic paint are preferably composed of decyl phenol modified epoxy resin, ethylene glycol butyl ether, ethylene glycol, butanol, carbon black, hydroxy cellulose, iron oxide, acetic acid, titanium dioxide, TEGO740W and TEGO 280.
In the art, the hydroxycellulose generally needs to be added in solution form by dissolving in water, and in the research of the present invention, the innovative finding can be directly added to the hydroxycellulose.
The invention also aims to provide a preparation method of the color paste for the cathode electrophoretic paint. The preparation method comprises the following steps:
mixing decyl phenol modified epoxy resin, ethylene glycol butyl ether, ethylene glycol and butanol according to a ratio, adding carbon black, soaking for 12-15 h, adding hydroxy cellulose, ferric oxide, acetic acid, titanium dioxide, a dispersing aid and a base material wetting agent, stirring uniformly, grinding to the fineness of 15 mu m, adding deionized water, and adjusting the solid content to 35-40% to obtain the product. Wherein the weight parts of the raw materials are as follows: 15-30 parts of decyl phenol modified epoxy resin, 3-10 parts of butyl cellosolve, 3-10 parts of ethylene glycol, 1-6 parts of butanol, 0.1-2 parts of carbon black, 7-14 parts of hydroxy cellulose, 1-6 parts of iron oxide, 0.5-2 parts of acetic acid, 12-25 parts of titanium dioxide, 0.1-0.5 part of dispersing auxiliary agent and 0.1-0.5 part of base material wetting agent.
The preparation method of the decyl phenol modified epoxy resin comprises the following steps: mixing epoxy resin, bisphenol, decylphenol, xylene and dimethylbenzylamine, reacting at 130-140 ℃, cooling to 80-90 ℃ when the epoxy value is 0.16, adding methyl isobutyl ketone, N-methylethanolamine and monoethanolamine, completely reacting at 110 +/-5 ℃, and removing the solvent to obtain the epoxy resin.
In the present invention, the parts by weight may be in the units of μ g, mg, g, kg, etc. known in the art, or may be multiples thereof, such as 1/10, 1/100, 10, 100, etc.
The color paste containing the decyl phenol modified epoxy resin is mixed with emulsion in the field, water is added to prepare a bath solution, and the electrophoretic penetration of a paint film obtained by electrophoretic production after curing is effectively improved to be up to 23.8 mm.
According to the invention, a large number of researches show that the salt spray resistance and the throwing power of the cathode electrophoretic paint prepared from the color paste are effectively improved and the electrophoretic coating productivity is improved by selecting the specific decyl phenol modified epoxy resin to be mixed with other specific components as the raw material of the color paste.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available. Wherein, if not specified, the carbon black is carbon black of cabot M700 type.
Example 1
The embodiment provides a color paste for cathode electrophoretic paint, and the preparation method comprises the following steps:
modification of epoxy resins with decyl phenol: adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of decylphenol, 70 parts of xylene and 5 parts of dimethylbenzylamine into a reaction kettle in sequence, reacting at 130 ℃, detecting the epoxy value in a reaction system, cooling to 90 ℃ when the epoxy value is 0.16, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting at 90 ℃ for 1 hour, adding 30 parts of monoethanolamine, reacting at 110 +/-5 ℃ for 3 hours, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 20 parts of decylphenol-modified epoxy resin, 5 parts of butyl cellosolve, 5 parts of ethylene glycol and 3 parts of butanol to obtain a mixed solution, and adding 1 part of carbon black into the mixed solution to soak for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 10 parts of hydroxy cellulose, 3 parts of ferric oxide, 0.1 part of dispersing aid TEGO740W, 0.8 part of acetic acid, 15 parts of titanium dioxide and 0.1 part of base material wetting agent TEGO280, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Example 2
The embodiment provides a color paste for cathode electrophoretic paint, and the preparation method comprises the following steps:
modification of epoxy resins with decyl phenol: adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of decylphenol, 70 parts of xylene and 5 parts of dimethylbenzylamine into a reaction kettle in sequence, reacting at 130 ℃, detecting the epoxy value in a reaction system, cooling to 90 ℃ when the epoxy value is 0.16, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting at 90 ℃ for 1 hour, adding 30 parts of monoethanolamine, reacting at 110 +/-5 ℃ for 3 hours, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 25 parts of decylphenol-modified epoxy resin, 6 parts of butyl cellosolve, 6 parts of ethylene glycol and 4 parts of butanol to obtain a mixed solution, and adding 1.2 parts of carbon black into the mixed solution to soak for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 12 parts of hydroxy cellulose, 3 parts of iron oxide, 0.2 part of dispersing aid TEGO740W, 0.8 part of acetic acid, 14 parts of titanium dioxide and 0.2 part of base material wetting agent TEGO280, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Example 3
The embodiment provides a color paste for cathode electrophoretic paint, and the preparation method comprises the following steps:
modification of epoxy resins with decyl phenol: adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of decylphenol, 70 parts of xylene and 5 parts of dimethylbenzylamine into a reaction kettle in sequence, reacting at 130 ℃, detecting the epoxy value in a reaction system, cooling to 90 ℃ when the epoxy value is 0.16, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting at 90 ℃ for 1 hour, adding 30 parts of monoethanolamine, reacting at 110 +/-5 ℃ for 3 hours, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 15 parts of decylphenol-modified epoxy resin, 3 parts of butyl cellosolve, 3 parts of ethylene glycol and 1 part of butanol to obtain a mixed solution, and adding 0.5 part of carbon black into the mixed solution to soak for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 7 parts of hydroxy cellulose, 1 part of ferric oxide, 0.1 part of dispersing aid TEGO740W, 0.8 part of acetic acid, 12 parts of titanium dioxide and 0.1 part of base material wetting agent TEGO280, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Example 4
The embodiment provides a color paste for cathode electrophoretic paint, and the preparation method comprises the following steps:
modification of epoxy resins with decyl phenol: sequentially adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of decylphenol, 70 parts of dimethylbenzene and 5 parts of dimethylbenzylamine into a reaction kettle, reacting at 130 ℃, detecting the epoxy value in a reaction system, when the epoxy value is 0.16, cooling to 90 ℃, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting for 1 hour at 90 ℃, adding 30 parts of monoethanolamine, reacting for 3 hours at 110 +/-5 ℃, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 30 parts of decylphenol-modified epoxy resin, 10 parts of butyl cellosolve, 10 parts of ethylene glycol and 6 parts of butanol to obtain a mixed solution, and adding 2 parts of carbon black into the mixed solution to soak for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 14 parts of hydroxy cellulose, 3 parts of iron oxide, 0.5 part of dispersing aid TEGO740W, 0.8 part of acetic acid, 20 parts of titanium dioxide and 0.5 part of base material wetting agent TEGO280, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Example 5
The embodiment provides a color paste for cathode electrophoretic paint, and the preparation method comprises the following steps:
modification of epoxy resins with decyl phenol: adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of decylphenol, 70 parts of xylene and 5 parts of dimethylbenzylamine into a reaction kettle in sequence, reacting at 130 ℃, detecting the epoxy value in a reaction system, cooling to 90 ℃ when the epoxy value is 0.16, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting at 90 ℃ for 1 hour, adding 30 parts of monoethanolamine, reacting at 110 +/-5 ℃ for 3 hours, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 20 parts of decylphenol-modified epoxy resin, 5 parts of butyl cellosolve, 5 parts of ethylene glycol and 3 parts of butanol to obtain a mixed solution, adding 1 part of cabot S90B type carbon black into the mixed solution, and soaking for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 10 parts of hydroxy cellulose, 3 parts of ferric oxide, 0.1 part of dispersing auxiliary agent BYK161, 0.8 part of acetic acid, 15 parts of titanium dioxide and 0.1 part of base material wetting agent BYK184, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Comparative example 1
The comparative example provides a color paste for a cathode electrophoretic paint, the preparation method comprising the steps of:
modifying epoxy resin with nonyl phenol: adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of nonylphenol, 70 parts of xylene and 5 parts of dimethylbenzylamine into a reaction kettle in sequence, reacting at 130 ℃, detecting the epoxy value in a reaction system, cooling to 90 ℃ when the epoxy value is 0.16, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting at 90 ℃ for 1 hour, adding 30 parts of monoethanolamine, reacting at 110 +/-5 ℃ for 3 hours, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 20 parts of nonylphenol modified epoxy resin, 5 parts of butyl cellosolve, 5 parts of ethylene glycol and 3 parts of butanol to obtain a mixed solution, and adding 1 part of carbon black into the mixed solution to soak for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 10 parts of hydroxy cellulose, 3 parts of ferric oxide, 0.1 part of dispersing aid TEGO740W, 0.8 part of acetic acid, 15 parts of titanium dioxide and 0.1 part of base material wetting agent TEGO280, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Comparative example 2
The comparative example provides a color paste for a cathode electrophoretic paint, the preparation method comprising the steps of:
modification of epoxy resins with decyl phenol: adding 500 parts of epoxy resin e-54, 125 parts of epoxy resin e-51, 63 parts of bisphenol, 125 parts of nonylphenol, 70 parts of xylene and 5 parts of dimethylbenzylamine into a reaction kettle in sequence, reacting at 130 ℃, detecting the epoxy value in a reaction system, cooling to 90 ℃ when the epoxy value is 0.16, adding 100 parts of methyl isobutyl ketone, adding 45 parts of N-methylethanolamine, reacting at 90 ℃ for 1 hour, adding 30 parts of monoethanolamine, reacting at 110 +/-5 ℃ for 3 hours, and removing a solvent to obtain the decylphenol modified epoxy resin.
Uniformly mixing 14 parts of nonylphenol modified epoxy resin, 2 parts of butyl cellosolve, 1 part of ethylene glycol and 1 part of butanol to obtain a mixed solution, and adding 1 part of carbon black into the mixed solution to soak for 12 hours to obtain carbon black color paste;
uniformly stirring carbon black color paste, 6 parts of hydroxy cellulose, 3 parts of ferric oxide, 0.1 part of dispersing aid TEGO760W, 0.8 part of acetic acid, 15 parts of kaolin and 0.1 part of base material wetting agent TEGO245, grinding to the fineness of 15 mu m, pouring deionized water, and adjusting the solid content to 40% to obtain the cathode electrophoretic paint color paste.
Experimental example 1
The emulsion 1 used was a commercially available unmodified epoxy resin emulsion available from the Hubei Cobanda technologies Ltd.
The emulsion 2 is an emulsion modified by using decyl phenol, and the preparation method comprises the following steps:
modification of epoxy resins with decyl phenol: 1750 parts of epoxy resin E-20, 250 parts of E-51, 200 parts of bisphenol, 100 parts of decyl phenol, 200 parts of dimethylbenzene and 5 parts of dimethylbenzylamine are added into a reaction kettle, and the reaction is carried out at 135 +/-5 ℃. When the epoxy value is 0.1, 315 parts of propylene glycol butyl ether and 315 parts of methyl isobutyl ketone are added, the temperature is reduced to 90 ℃, 150 parts of methylethanolamine is added, the reaction is carried out for 1 hour at 90 ℃, 75 parts of monoethanolamine is added, and the reaction is carried out for 3 hours at 110 +/-5 ℃. Cooling to 90 ℃, and adding 1000 parts of cross-linking agent 1; cooling to 70 ℃, adding 2 parts of BYK425, 5 parts of OP-4 and 2 parts of TEGO130, stirring for 1 hour, adding 50 parts of acetic acid and 150 parts of lactic acid at 60 ℃, and stirring for 0.5 hour. Discharging the obtained product into 5000 parts of water, emulsifying, and removing the solvent to obtain the emulsion. The preparation method of the cross-linking agent 1 comprises the following steps: putting 522 parts of TDI and 242 parts of methyl isobutyl ketone into a reaction kettle, heating to 50 ℃, dropwise adding 92 parts of glycerol, keeping the temperature at 50-55 ℃, detecting NCO percent to be 14.72 +/-0.1%, heating to 70 ℃, dropwise adding 354 parts of ethylene glycol monobutyl ether, keeping the temperature at 70-80 ℃, detecting NCO <8 x 10-3%, packaging and discharging.
And respectively mixing the emulsions in the examples 1-5 and the comparative examples 1-2 with the emulsion 1 and the emulsion 2 according to the mass ratio of 4:1, adding deionized water to prepare a bath solution with the solid content of 20%, curing for 48 hours, and carrying out electrophoresis production to obtain the coated cathode electrophoretic paint. The throwing power of the resulting cathodic electrophoretic paint was measured using the ford box method and the salt spray time was measured using a standard salt spray test, with the results as given in table 1 below.
TABLE 1 Performance results for cathodic electrodeposition paints
Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The color paste for the cathode electrophoretic paint is characterized by comprising the following raw materials in parts by weight: 15-30 parts of decyl phenol modified epoxy resin, 3-10 parts of butyl cellosolve, 3-10 parts of ethylene glycol, 1-6 parts of butanol, 0.1-2 parts of carbon black, 7-14 parts of hydroxy cellulose, 1-6 parts of iron oxide, 0.5-2 parts of acetic acid, 12-25 parts of titanium dioxide, 0.1-0.5 part of dispersing auxiliary agent and 0.1-0.5 part of base material wetting agent;
the preparation method of the decyl phenol modified epoxy resin comprises the following steps: mixing epoxy resin, bisphenol, decylphenol, xylene and dimethylbenzylamine, reacting at 130-140 ℃, cooling to 80-90 ℃ when the epoxy value is 0.16, adding methyl isobutyl ketone, N-methylethanolamine and monoethanolamine, completely reacting at 110 +/-5 ℃, and removing the solvent to obtain the epoxy resin;
the weight ratio of the epoxy resin, the bisphenol, the decylphenol, the dimethylbenzene and the dimethylbenzylamine is (5-6): 0.5-0.55): 1, (0.5-0.6): 0.04-0.05): 0.8-0.9): 0.3-0.4): 0.2-0.3);
the epoxy resin is a mixture of E-54 and E-51; wherein the mass ratio of E-54 to E-51 is (4-5) to 1;
the dispersing aid is TEGO 740W;
the substrate wetting agent is TEGO 280.
2. The color paste according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 20-25 parts of decyl phenol modified epoxy resin, 5-6 parts of butyl cellosolve, 5-6 parts of ethylene glycol, 3-4 parts of butanol, 1-1.2 parts of carbon black, 10-12 parts of hydroxy cellulose, 3-4 parts of iron oxide, 0.7-0.8 part of acetic acid, 14-15 parts of titanium dioxide, 0.1-0.2 part of dispersing auxiliary agent and 0.1-0.2 part of base material wetting agent.
3. The method for preparing the color paste according to claim 1 or 2, which is characterized by comprising the following steps:
mixing decyl phenol modified epoxy resin, ethylene glycol butyl ether, ethylene glycol and butanol according to a ratio, adding carbon black, soaking for 12-15 h, adding hydroxy cellulose, ferric oxide, acetic acid, titanium dioxide, a dispersing aid and a base material wetting agent, stirring uniformly, grinding to the fineness of 15 mu m, adding deionized water, and adjusting the solid content to 35-40% to obtain the product.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156163A (en) * | 1991-10-12 | 1997-08-06 | 巴斯夫漆及染料公司 | Method for electrophoretic coating by pigment formula |
| CN102850892A (en) * | 2012-09-06 | 2013-01-02 | 湖北天鹅涂料股份有限公司 | Weathering resistance type cathode electrophoresis coating material composition |
| CN102942835A (en) * | 2012-11-21 | 2013-02-27 | 广东科德化工实业有限公司 | High throwing power cathode electrophoresis paint and preparation method and using method thereof |
| CN107022246A (en) * | 2017-04-27 | 2017-08-08 | 枣阳市同邦达科技有限公司 | A kind of cathode electrodip painting mill base and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156163A (en) * | 1991-10-12 | 1997-08-06 | 巴斯夫漆及染料公司 | Method for electrophoretic coating by pigment formula |
| CN102850892A (en) * | 2012-09-06 | 2013-01-02 | 湖北天鹅涂料股份有限公司 | Weathering resistance type cathode electrophoresis coating material composition |
| CN103436153A (en) * | 2012-09-06 | 2013-12-11 | 湖北天鹅涂料股份有限公司 | Weather-proof cathodic electrophoretic coating composition |
| CN102942835A (en) * | 2012-11-21 | 2013-02-27 | 广东科德化工实业有限公司 | High throwing power cathode electrophoresis paint and preparation method and using method thereof |
| CN107022246A (en) * | 2017-04-27 | 2017-08-08 | 枣阳市同邦达科技有限公司 | A kind of cathode electrodip painting mill base and preparation method thereof |
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