CN110358412B - Oil-shrinking cathode electrophoretic coating and preparation method thereof - Google Patents
Oil-shrinking cathode electrophoretic coating and preparation method thereof Download PDFInfo
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- CN110358412B CN110358412B CN201910772031.1A CN201910772031A CN110358412B CN 110358412 B CN110358412 B CN 110358412B CN 201910772031 A CN201910772031 A CN 201910772031A CN 110358412 B CN110358412 B CN 110358412B
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- 238000000576 coating method Methods 0.000 title claims abstract description 34
- 239000011248 coating agent Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 39
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 39
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 39
- 239000003973 paint Substances 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000003822 epoxy resin Substances 0.000 claims abstract description 17
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 17
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000012948 isocyanate Substances 0.000 claims abstract description 15
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 15
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims abstract description 13
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 125000005442 diisocyanate group Chemical group 0.000 claims description 4
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 4
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 3
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 3
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 3
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 3
- 230000001476 alcoholic effect Effects 0.000 claims description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 3
- AYLRODJJLADBOB-QMMMGPOBSA-N methyl (2s)-2,6-diisocyanatohexanoate Chemical compound COC(=O)[C@@H](N=C=O)CCCCN=C=O AYLRODJJLADBOB-QMMMGPOBSA-N 0.000 claims description 2
- 238000004070 electrodeposition Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 28
- 235000019198 oils Nutrition 0.000 description 28
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 239000012752 auxiliary agent Substances 0.000 description 5
- 238000001962 electrophoresis Methods 0.000 description 5
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 4
- 235000010469 Glycine max Nutrition 0.000 description 3
- 244000068988 Glycine max Species 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229920002545 silicone oil Polymers 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 239000008157 edible vegetable oil Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 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
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4473—Mixture of polymers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Paints Or Removers (AREA)
Abstract
The application discloses an oil-shrinking cathode electrophoretic coating and a preparation method thereof, isocyanate and methyl isobutyl ketone are added into a reaction vessel, nitrogen is introduced, and stirring and heating are carried out simultaneously; dropwise adding end-capped polydimethylsiloxane containing active H into the reaction container, heating after dropwise adding is finished, and cooling after the first reaction is finished; continuously dropwise adding ethylene glycol butyl ether into the reaction container, heating, and cooling for later use after the second reaction is finished; adding epoxy resin into another reaction container, adding the prepared materials into the reaction container, stirring, heating, and adding acetic acid to neutralize the resin; stopping heating, adding pure water, and dispersing uniformly to obtain the finished product. The oil-reducing electrophoretic coating has excellent repeated continuous oil-reducing effect and hardness, and has the advantages of good stability of raw paint, easy application and the like.
Description
Technical Field
The invention belongs to the technical field of cathode electrophoretic coatings and preparation methods thereof, and particularly relates to an oil-shrinking cathode electrophoretic coating and a preparation method thereof.
Background
The electrophoretic coating is a novel coating which is developed in the middle of the 70 th of the 20 th century and is industrially applied, has the advantages of environmental protection, high throwing power, high coating efficiency, good coating quality, high application automation degree and the like, and has increasingly wider application along with increasing awareness of society on energy conservation and environmental protection, strict limitation of relevant environmental regulations on the content of volatile organic solvents.
The epoxy cathode electrophoretic paint has the advantages of strong adhesion, high temperature resistance, chemical resistance and the like, is little and few when being applied to the electrophoretic paint with repeated continuous oil shrinkage of fan blades of the range hood, and the conventional oil-shrinking electrophoretic paint has the oil shrinkage effect by adding an oil-shrinking auxiliary agent, wherein the oil-shrinking auxiliary agent is generally organic silicone oil and fluorine-containing substances with low surface tension. However, after the paint film is dried by the electrophoresis in the additional mode, the auxiliary agent is leveled to the surface of the paint film, although the paint film has the oil shrinking effect, the effect of multiple times of continuous operation cannot be achieved, and the oil shrinking auxiliary agent in the original paint can float on the surface of the original paint due to the characteristic of low surface tension of the oil shrinking auxiliary agent along with the time, so that the defects of shrinkage cavity and the like of the paint film are caused. The development and the application of the smoke exhaust ventilator are limited. Therefore, the modified oil shrinkage of the cathode epoxy electrophoretic coating has important research significance.
Disclosure of Invention
The present invention is directed to an oil-reduced cathode electrophoretic coating and a method for preparing the same, which solves one or more of the above-mentioned problems of the prior art.
The invention relates to an oil-shrinking cathode electrophoretic coating which comprises the following components in parts by weight: 30-100 parts of isocyanate;
5-35 parts of methyl isobutyl ketone;
5-20 parts of end-capped polydimethylsiloxane containing active H;
40-800 parts of ethylene glycol butyl ether;
200 parts of epoxy resin and 450 parts of epoxy resin;
10-400 parts of acetic acid;
900 portions of pure water and 1500 portions.
In one embodiment: comprises the following components in parts by weight: 65-70 parts of isocyanate; 10-15 parts of methyl isobutyl ketone; 8-10 parts of end-capped polydimethylsiloxane containing active H; 55-60 parts of ethylene glycol butyl ether; 300 portions and 350 portions of epoxy resin; 15-20 parts of acetic acid; 900 portions of pure water.
In one embodiment: the end-capped polydimethylsiloxane containing active H comprises amino end-capped polydimethylsiloxane, carboxyl end-capped polydimethylsiloxane or alcoholic hydroxyl end-capped polydimethylsiloxane.
In one embodiment: the isocyanate is diisocyanate.
In one embodiment: the diisocyanate includes toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate.
In addition, a preparation method for preparing the oil-shrinking cathode electrophoretic coating is also provided: adding isocyanate and methyl isobutyl ketone into a reaction vessel, introducing nitrogen, stirring and heating simultaneously; dropwise adding end-capped polydimethylsiloxane containing active H into the reaction container, heating after dropwise adding is finished, and cooling after the first reaction is finished; continuously dropwise adding ethylene glycol butyl ether into the reaction container, heating, and cooling for later use after the second reaction is finished; adding epoxy resin into another reaction container, adding the prepared materials into the reaction container, stirring, heating, and adding acetic acid to neutralize the resin; stopping heating, adding pure water, and dispersing uniformly to obtain the finished product.
In some embodiments, the first reaction is to an NCO value of 255-.
In some embodiments, the second reaction is to an NCO value of < 1.5% o.
The invention provides an oil-shrinking cathode electrophoretic coating which is modified by using terminated polydimethylsiloxane containing active H, and a main curing agent comprises an electrophoretic coating of polydimethylsiloxane with a main chain bonded with low surface tension. The end-capped polydimethylsiloxane containing the active H not only has the advantages of low surface tension, easiness in cleaning and high hardness of silicone oil, but also has active H groups at the tail end, and the structures endow the end-capped polydimethylsiloxane containing the active H with excellent oil stain resistance and reactivity. The blocked polydimethylsiloxane modified isocyanate curing agent containing the active H has the advantages that active groups at two ends of polydimethylsiloxane react with NCO groups and are connected into isocyanate, so that the residual NCO groups are completely blocked by ethylene glycol butyl ether, epoxy resin and the completely blocked isocyanate modified curing agent are fully and uniformly wrapped, the polydimethylsiloxane modified curing agent is uniformly attached to the surface of an object to be coated after electrophoresis, and the polydimethylsiloxane is large in molecular weight and does not unblock at the curing temperature after curing, so that the polydimethylsiloxane modified curing agent can uniformly exist in a paint film. Meanwhile, due to the low surface tension and lubricity of the siloxane, a cured paint film has a multiple-time continuous oil shrinkage effect. The problem that siloxane is easy to hydrolyze in the waterborne electrophoretic paint is solved, and the problems of shrinkage cavity of a paint film and instability of the original paint are avoided, so that the applicability of the waterborne electrophoretic paint at an application end is greatly improved.
Detailed Description
Example 1
The oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 30 parts of toluene diisocyanate;
5 parts of methyl isobutyl ketone;
5 parts of carboxyl end-capped polydimethylsiloxane;
40 parts of ethylene glycol butyl ether;
200 parts of epoxy resin;
10 parts of acetic acid;
900 parts of pure water.
In addition, a preparation method for preparing the oil-shrinking cathode electrophoretic coating is also provided: adding toluene diisocyanate and methyl isobutyl ketone into a reaction container with stirring and condensation functions, introducing nitrogen, heating to 60 +/-2 ℃, then slowly dropwise adding carboxyl-terminated polydimethylsiloxane into the reaction container for 30 +/-5 minutes, maintaining the temperature of 60 +/-2 ℃ in the dropwise adding process, heating to 80 +/-2 ℃ after the dropwise adding is finished, reacting for 2 +/-5 minutes for 2 hours +/-5 minutes until the NCO value is 255 plus-minus 275 thousandths, cooling to 60 +/-2 ℃, continuously dropwise adding 55-60 parts by weight of ethylene glycol butyl ether into the reaction container, heating to 85 +/-2 ℃, reacting for 3 hours +/-5 minutes until the NCO value is less than 1.5 thousandths, and cooling to 55 +/-2 ℃ for later use;
adding epoxy resin into another reaction container, adding all the prepared materials into the reaction container, stirring and heating to 70 +/-2 ℃, stirring for 15 +/-2 minutes at the temperature to fully and uniformly stir the two materials, then adding acetic acid, keeping the temperature at 65 +/-2 ℃ for 15 +/-2 minutes to fully neutralize the resin; and (3) closing the heating system, adding pure water, and uniformly dispersing to prepare the oil-shrinkage cathode electrophoretic coating.
Example 2
The oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 65-70 parts of isophorone diisocyanate; 10-15 parts of methyl isobutyl ketone; 8-10 parts of amino end-capped polydimethylsiloxane; 55-60 parts of ethylene glycol butyl ether; 300 portions and 350 portions of epoxy resin; 15-20 parts of acetic acid; 900 portions of pure water.
The preparation method is the same as the method.
Example 3
The oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 68 parts of diphenylmethane diisocyanate; 13 parts of methyl isobutyl ketone; 9 parts of amino-terminated polydimethylsiloxane; 58 parts of ethylene glycol butyl ether; 325 parts of epoxy resin; 18 parts of acetic acid; 950 parts of pure water.
The preparation method is the same as the method.
Example 4
The oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 70 parts of dicyclohexyl methane diisocyanate; 15 parts of methyl isobutyl ketone; 10 parts of carboxyl-terminated polydimethylsiloxane; 60 parts of ethylene glycol butyl ether; 350 parts of epoxy resin; 20 parts of acetic acid; 1000 parts of pure water.
The preparation method is the same as the method.
Example 5
The oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 100 parts of hexamethylene diisocyanate;
35 parts of methyl isobutyl ketone;
20 parts of alcoholic hydroxyl group-terminated polydimethylsiloxane;
800 parts of ethylene glycol butyl ether;
450 parts of epoxy resin;
400 parts of acetic acid;
1500 parts of pure water.
The preparation method is the same as the method.
Matching the electrophoretic coating obtained in the above examples 1, 3 and 5 with a colored paint, an unmodified electrophoretic coating and an electrophoretic coating with an external oil-condensation assistant (BYK-3720) with the same colored paint, performing electrophoresis plate making for 1 day of circulation and electrophoresis plate making after 5 days of circulation, wherein the film thickness is 18-22um, baking and cooling at 190 ℃/15min-20min, and testing the indexes of a sample plate, wherein the index range of the sample plate is as follows:
paint film surface oil shrinkage test method
1. Instrument for measuring the position of a moving object
Test sample, paper towel, paper with certain roughness, protective gloves.
2. Reagent
Used edible oil (Soybean oil)
3. Inspection step
3.1 edible oil test method:
3.1.1 first oil reduction: a drop of oil with the size similar to that of soybean is dropped on the surface of a paint film of a product, the product is horizontally placed, the surface of the paint film is pressed by fingers to quickly scratch the oil, the oil is collected and accumulated, the oil shrinks within 2S, and the oil shrinks into a plurality of small raindrops within 10S.
3.1.2 secondary oil shrinkage: after the surface of a paint film is wiped clean by a paper towel, the paint film is wiped repeatedly for 10 times by paper with certain roughness, a drop of oil with the size similar to that of soybean is dropped on the surface of the paint film of a product, the product is horizontally placed, the surface of the paint film is pressed by fingers to quickly scratch the oil, the oil is collected and accumulated, the shrinkage phenomenon appears within 2S, and the oil is shrunk into a plurality of small raindrops within 15S.
3.1.3 oil reduction for three times: after the surface of a paint film is wiped clean by a paper towel, the paint film is wiped repeatedly for 10 times by paper with certain roughness, a drop of oil with the size similar to that of soybean is dropped on the surface of the paint film of a product, the product is horizontally placed, the surface of the paint film is pressed by fingers to quickly scratch the oil, the oil is collected and accumulated, the contraction phenomenon occurs within 2S, and the oil is contracted into a plurality of small raindrops within 20S.
4. Matters of attention
4.1 the wiping surface of the paper with certain roughness has proper force, and the wiping pressure is ensured to be kept between 500g and 1000 g.
In summary, the invention provides an oil-shrinking cathode electrophoretic coating, which is an electrophoretic coating modified by terminated polydimethylsiloxane containing active H, and a main curing agent comprises polydimethylsiloxane with a main chain bonded with low surface tension. The end-capped polydimethylsiloxane containing the active H not only has the advantages of low surface tension, easiness in cleaning and high hardness of silicone oil, but also has active H groups at the tail end, and the structures endow the end-capped polydimethylsiloxane containing the active H with excellent oil stain resistance and reactivity. The blocked polydimethylsiloxane modified isocyanate curing agent containing the active H has the advantages that active groups at two ends of polydimethylsiloxane react with NCO groups and are connected into isocyanate, so that the residual NCO groups are completely blocked by ethylene glycol butyl ether, epoxy resin and the completely blocked isocyanate modified curing agent are fully and uniformly wrapped, the polydimethylsiloxane modified curing agent is uniformly attached to the surface of an object to be coated after electrophoresis, and the polydimethylsiloxane is large in molecular weight and does not unblock at the curing temperature after curing, so that the polydimethylsiloxane modified curing agent can uniformly exist in a paint film. Meanwhile, due to the low surface tension and lubricity of the siloxane, a cured paint film has a multiple-time continuous oil shrinkage effect. The problem that siloxane is easy to hydrolyze in the waterborne electrophoretic paint is solved, and the problems of shrinkage cavity of a paint film and instability of the original paint are avoided, so that the applicability of the waterborne electrophoretic paint at an application end is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 30-100 parts of isocyanate; 5-35 parts of methyl isobutyl ketone; 5-20 parts of end-capped polydimethylsiloxane containing active H; 40-800 parts of ethylene glycol butyl ether; 200 parts of epoxy resin and 450 parts of epoxy resin; 10-400 parts of acetic acid; 900 portions of pure water and 1500 portions; the preparation method of the oil-shrinking cathode electrophoretic coating comprises the following steps: adding isocyanate and methyl isobutyl ketone into a reaction vessel, introducing nitrogen, stirring and heating simultaneously; dropwise adding end-capped polydimethylsiloxane containing active H into the reaction container, heating after dropwise adding is finished, and cooling after the first reaction is finished; continuously dropwise adding ethylene glycol butyl ether into the reaction container, heating, and cooling for later use after the second reaction is finished; adding epoxy resin into another reaction container, adding the material prepared in the previous step into the reaction container, stirring, heating, and then adding acetic acid to neutralize the resin; stopping heating, adding pure water, and dispersing uniformly to obtain the finished product.
2. The oil-shrinking cathode electrophoretic coating according to claim 1, wherein the oil-shrinking cathode electrophoretic coating comprises the following components in parts by weight: 65-70 parts of isocyanate; 10-15 parts of methyl isobutyl ketone; 8-10 parts of end-capped polydimethylsiloxane containing active H; 55-60 parts of ethylene glycol butyl ether; 300 portions and 350 portions of epoxy resin; 15-20 parts of acetic acid; 900 portions of pure water.
3. The oil-shrinking cathode electrophoretic coating according to any one of claims 1 or 2, wherein the blocked polydimethylsiloxane containing active H is one or more of amino-blocked polydimethylsiloxane, carboxyl-blocked polydimethylsiloxane and alcoholic hydroxyl-blocked polydimethylsiloxane.
4. The oil-reduced cathodic electrocoating of any one of claims 1 or 2 wherein the isocyanate is a diisocyanate.
5. The paint cathode electrophoretic paint according to claim 4, wherein the diisocyanate comprises toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, or lysine diisocyanate.
6. The oil-shrink cathode electrophoretic coating according to claim 1, wherein the first reaction is carried out to an NCO value of 255-275 ‰.
7. The oil-reduced cathodic electrophoretic paint according to claim 1, wherein the second reaction is carried out to NCO value < 1.5 ‰.
Priority Applications (1)
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| CN201910772031.1A CN110358412B (en) | 2019-08-21 | 2019-08-21 | Oil-shrinking cathode electrophoretic coating and preparation method thereof |
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|---|---|---|---|
| CN201910772031.1A CN110358412B (en) | 2019-08-21 | 2019-08-21 | Oil-shrinking cathode electrophoretic coating and preparation method thereof |
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| CN103319689B (en) * | 2013-06-24 | 2015-11-18 | 浩力森涂料（上海）有限公司 | A kind of high throwing power cathode electrophoresis dope emulsion resin and preparation method thereof |
| CN108753245A (en) * | 2018-06-29 | 2018-11-06 | 合肥帧讯低温科技有限公司 | Low-temperature-resistant environment-friendly sealant and preparation method thereof |
| CN109111563B (en) * | 2018-07-19 | 2021-06-15 | 浩力森化学科技（江苏）有限公司 | Pigment dispersion resin for primer-topcoat cathode electrophoretic coating and preparation method thereof |
| CN108976884B (en) * | 2018-07-29 | 2021-03-26 | 立邦工业涂料(上海)有限公司 | Electrophoretic paint and preparation method thereof |
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