CN115710450A - Automobile lightweight aluminum substrate coating and preparation method thereof - Google Patents
Automobile lightweight aluminum substrate coating and preparation method thereof Download PDFInfo
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- CN115710450A CN115710450A CN202211670736.0A CN202211670736A CN115710450A CN 115710450 A CN115710450 A CN 115710450A CN 202211670736 A CN202211670736 A CN 202211670736A CN 115710450 A CN115710450 A CN 115710450A
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- epoxy resin
- organic solvent
- bisphenol
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- 238000000576 coating method Methods 0.000 title claims abstract description 49
- 239000011248 coating agent Substances 0.000 title claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 39
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000000758 substrate Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000003960 organic solvent Substances 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 57
- 239000003822 epoxy resin Substances 0.000 claims abstract description 45
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 45
- 239000003973 paint Substances 0.000 claims abstract description 24
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 239000000049 pigment Substances 0.000 claims abstract description 12
- 239000004952 Polyamide Substances 0.000 claims abstract description 9
- 229920002647 polyamide Polymers 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 7
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 71
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 34
- 239000008096 xylene Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 28
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims description 24
- 239000000440 bentonite Substances 0.000 claims description 20
- 229910000278 bentonite Inorganic materials 0.000 claims description 20
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000007822 coupling agent Substances 0.000 claims description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 claims description 8
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 7
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims description 5
- 125000000467 secondary amino group Chemical class [H]N([*:1])[*:2] 0.000 claims description 5
- 239000006072 paste Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 150000001804 chlorine Chemical class 0.000 claims description 2
- 239000004922 lacquer Substances 0.000 claims description 2
- 150000003141 primary amines Chemical class 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 16
- 230000001070 adhesive effect Effects 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 7
- 238000009736 wetting Methods 0.000 abstract description 3
- 239000012752 auxiliary agent Substances 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 239000003562 lightweight material Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 21
- 239000002585 base Substances 0.000 description 18
- 239000000203 mixture Substances 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 235000010215 titanium dioxide Nutrition 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000001038 titanium pigment Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000012767 functional filler Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention relates to a coating for an automobile lightweight aluminum substrate and a preparation method thereof. The paint consists of a main agent and a curing agent, wherein the main agent consists of modified epoxy resin, pigment, filler, an auxiliary agent and an organic solvent, and the curing agent is a polyamide curing agent. The weight percentage ratio of the main agent to the curing agent is 100:18-22. The invention relates to a coating system built by modified epoxy resin, and a dispersant is added to enhance the wetting effect of the coating and the adhesive force of a paint film. The coating of the lightweight material of the automobile is met, and the effects of energy conservation and emission reduction are achieved.
Description
Technical Field
The invention belongs to the technical field of coatings and production processes thereof, and discloses an automobile lightweight aluminum substrate coating composed of modified epoxy resin, pigment and polyamide curing agent and a preparation method thereof.
Background
The aluminum substrate coating for the light weight of the automobile has the advantages that the surface of an aluminum plate is smooth, so that the problem of paint falling is easily caused after a lot of coatings are coated on the surface, and the coating is poor in adhesive force and is not firmly combined with the aluminum substrate. At present, the common coating products and the like in the market can not be directly coated on the surface of the aluminum base material.
Aluminum atoms and partial residual aluminum oxide on the surface of the aluminum base material are easy to react with electron-rich groups, and based on the effect, the modified epoxy resin prepared by grafting the electron-rich groups on the epoxy resin can be used for preparing the modified epoxy coating with better adhesive force. The automobile lightweight aluminum base material coating has excellent adhesive force to an aluminum base material, and a paint film does not fall off; the substrate is not required to be polished, and the surface is scrubbed by using a solvent to remove oil stains, so that the surface treatment process is reduced, and the cost of manpower and material resources is saved; the coating is applied to aluminum materials and can play a very good role in protecting base materials.
Disclosure of Invention
The invention aims to use the aluminum base material for lightening the automobile, improve the adhesive force of the coating to the aluminum base material, reduce the falling off of a paint film, reduce the cost and save energy. It is prepared from modified epoxy resin, pigment, functional filler and disperser. A coupling agent, an organic solvent and a curing agent.
In order to achieve the purpose, the invention discloses the following technical contents:
the automobile lightweight aluminum substrate coating is characterized by comprising a main agent and a curing agent, wherein the weight part ratio of the main agent to the curing agent is (100);
the main raw materials of the main agent are as follows:
34-38 parts of modified epoxy resin
dispersant/BYK-163 0.15-0.25 part
7-9 parts of bentonite paste
10-15 parts of titanium dioxide/R6618T
Zinc phosphate 11-16 parts
Talcum powder/400 mesh 11-16 parts
2 to 5 portions of heavy calcium carbonate/600 meshes
Organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) 10-13 parts
0.45-0.65 part of coupling agent KH-560
The bentonite paste in the raw materials is prepared from the following components in percentage by weight:
8-10 parts of bentonite A307
3-5 parts of ethanol
85-89 parts of organic solvent dimethylbenzene
The main raw materials of the curing agent are as follows:
43-46 parts of organic solvent xylene
10-13 parts of organic solvent n-butanol
Polyamide curing agent D8115A 41-47 parts
Description of the above raw materials: the modified epoxy resin is self-made, and the dispersing agent is BYK-163 on the Hualing coating, bentonite A307 of Haidisi, titanium pigment R6618T of Xin standard chemical, zinc phosphate of Hunan Ruili stone, talcum powder of 400 meshes and heavy calcium carbonate of 600 meshes of Shandong Yudong, organic solvent xylene sold by Beacon, organic solvent n-butanol and organic solvent ethanol, KH-560 of Beijing Shenda, and polyamide curing agent D8115A of Shanghai Junjiang.
Synthesis of modified epoxy resin:
(1) Preparing primary amino epoxy resin: weighing bisphenol A epoxy resin, dissolving the bisphenol A epoxy resin in water, dropwise adding concentrated ammonia water into the bisphenol A epoxy resin to ensure that the concentration of the ammonia water in the reaction solution is 20-25%, stirring and reacting at the constant temperature of 60-80 ℃ for 2-4 h to obtain the modified amino epoxy resin, wherein the mass ratio of the concentrated ammonia water to the bisphenol A epoxy resin is (10-15): 100.
(2) Preparation of secondary amino epoxy resin: weighing bisphenol A epoxy resin, dissolving the bisphenol A epoxy resin in water, dropwise adding methylamine into the bisphenol A epoxy resin, stirring at the constant temperature of 40-60 ℃ and reacting for 10-12 hours to obtain the modified secondary amino epoxy resin, wherein the mass ratio of methylamine to bisphenol A epoxy resin is (5-10): 100.
(3) Preparing chlorine-containing epoxy resin: weighing bisphenol A epoxy resin, dissolving the bisphenol A epoxy resin in water, dropwise adding 5 mol/L hydrochloric acid into the bisphenol A epoxy resin, stirring at a constant temperature of 40-60 ℃ and reacting for 1-2 hours to obtain the modified chlorine-containing epoxy resin, wherein the mass ratio of HCl to bisphenol A epoxy resin is (5-10): 100.
A main agent:
(1) Preparing paint paste: modified epoxy resin and organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) are added into a preparation tank, stirring is carried out at a low speed (300-500 revolutions/minute), and dispersant BYK-163, bentonite paste, pigment, filler and a proper amount of organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) are slowly added in sequence. Grinding the mixture upwards, and grinding the mixture to be qualified according to the fineness requirement;
(2) Preparing finished paint: transferring the grinded qualified paint paste to a finished product tank or a stainless steel basin, starting to stir at low speed of 300-500 r/min, sequentially adding an organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) and a coupling agent KH-560, adjusting to control indexes such as viscosity, solid content and the like until the paint paste is qualified, starting to stir at high speed (1200-1500 r/min) after the paint paste is qualified, and stirring for 20 minutes.
(3) The preparation of the curing agent comprises the following steps:
adding a curing agent D8115A and an organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) into a stainless steel basin, stirring for 10 minutes, and finally preparing a finished product.
(4) Technical index
Main technical indexes
The invention further discloses application of the automobile lightweight aluminum base material coating in improving the adhesive force of a paint film to an aluminum base material, and experimental results prove that: the automobile lightweight aluminum base material coating has excellent adhesion to an aluminum base material, and the adhesion of the primary amino modified resin coating can reach 2H.
The self-made modified epoxy resin has better adhesive force with an aluminum base material through rich electronic groups; the bentonite A307 is selected to prepare the pre-gel, and the use efficiency is higher than that of dry powder; the selected dispersant is wetting dispersant BYK-163, the auxiliary agent BYK-163 is added before the anticorrosive pigment, the subsequent pigment flocculation can be prevented through steric hindrance due to high molecular weight, the viscosity is reduced, the leveling property is further enhanced, and the adhesive force of a coating film is further enhanced; the selected pigment titanium white R6618T is rutile type, and has excellent weather resistance, dispersibility and paint film curing property, good covering power and tinting strength when used in paint, the additive amount of the pigment is reduced, and the cost is reduced; the zinc phosphate is used as a chemical antirust pigment, has chemical activity, can form an isolation layer by means of chemical reaction to play a role in protection, and further protects the coating; the talcum powder of 400 meshes is selected, so that the talcum powder has the characteristics of good chemical stability and acid and alkali resistance; the filler coarse whiting powder plays a role in filling and leveling the coating film gap and has good economical efficiency; the organic solvent xylene/organic solvent n-butyl alcohol are mixed for use, the xylene and the n-butyl alcohol have the functions of assisting dissolution and promoting epoxy curing, and the stability of the coating is enhanced through the dissolving power to resin; the coupling agent KH-560 is selected, so that the infiltration and the expansion of the resin on the surface of the aluminum plate are facilitated, the wetting capacity of the resin on the plate is improved, the resin and the aluminum plate are well bonded together, and the adhesive force of a paint film is further improved; the polyamide curing agent D8115A enables the excellent modified epoxy resin toughening curing agent to enable the modified epoxy resin to perform a crosslinking reaction at room temperature or under a heating condition, has the characteristics of strong adhesive force and good antirust effect, and has excellent flexibility and chemical stability.
The invention mainly solves the problem of poor adhesive force of the automobile lightweight aluminum base material coating, mainly inspects the adhesive force of modified epoxy resin with different structures to the aluminum base material, and has the main difficulty of selection, modification and synthesis of the epoxy resin.
Compared with the prior art, the automobile lightweight aluminum substrate coating and the preparation method thereof disclosed by the invention have the positive effects that:
(1) The self-made modified epoxy resin is rich in electronic groups, can better react with an aluminum base material, and has excellent adhesive force.
(2) The selected curing agent has good toughening effect, can be quickly cured, improves the corrosion resistance, and forms a stable coating system with good permeability, thereby effectively improving the adhesive force of a paint film and having excellent construction performance.
(3) Through adding the bentonite gel, add to contrast dry powder, the interlayer expansion, dispersion effect are excellent, prevent that inorganic filler from deposiing, have good thickening type and thixotropy, have effectively solved aluminum plate coating and have deposiing, the sagging problem, promote application production efficiency.
(4) The silane coupling agent KH-560 is added to form a bonding layer between the inorganic matter and organic matter interfaces, so that a coupling effect is generated at the interfaces, the bonding strength between the coating and the aluminum plate is improved, and the water resistance of the coating is enhanced.
(5) The coating does not contain heavy metals such as lead, chromium and the like, is harmless to human health, and meets the emission standard of European Union solvents; can be matched with various coatings, such as fluorocarbon paint, polyurethane paint, epoxy paint and the like, and has various coating systems.
Detailed Description
The invention will now be described by way of specific embodiments, the technical processes in the examples of the invention being clearly and completely described. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes or modifications in the components and amounts of the materials used in these embodiments can be made without departing from the spirit and scope of the invention.
Sources of raw materials used in the examples: BYK-163 serving as a dispersant of the Hualing coating, bentonite A307 of Heidisi, titanium pigment R6618T serving as a chemical standard in Xin, zinc phosphate of Hunan Ruiye, 400 meshes of talcum powder and 600 meshes of heavy calcium carbonate of Shandong Yudong, xylene serving as an organic solvent sold by lighthouse, n-butyl alcohol serving as an organic solvent and ethanol serving as an organic solvent, KH-560 serving as Beijing Shenda and a polyurethane curing agent D8115A serving as a curing agent of Shanghai Junjiang.
Example 1
The automobile lightweight aluminum substrate coating consists of a main agent and a curing agent, wherein the weight part ratio of the main agent to the curing agent is 100;
the main raw materials of the main agent are as follows:
modified epoxy resin 36.23
dispersant/BYK-163 0.20
Bentonite 8.44
Titanium dioxide/R6618T 12.83
Zinc phosphate 13.25
Talcum powder/400 mesh 13.80
Ground calcium carbonate/600 mesh 3.10
Organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) 11.65
Coupling agent KH-560.5
The bentonite paste in the raw materials is prepared from the following components in percentage by weight:
bentonite A307 10
Ethanol 5
Organic solvent xylene 85
The main raw materials of the curing agent are as follows:
organic solvent xylene 44.91
Organic solvent n-butanol 11.44
Polyamide curing agent D8115A 43.65
A main agent:
(1) Preparing paint paste: adding modified epoxy resin, organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio), stirring at low speed (500 r/min), slowly adding dispersant BYK-163, bentonite paste, pigment, filler and a proper amount of organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) in sequence, stirring at high speed (1500 r/min) after adding, and stirring for 1 hour. Grinding the mixture upwards, and grinding the mixture to be qualified according to the fineness requirement;
(2) Preparing finished paint: transferring the grinded qualified mortar to a finished product tank or a stainless steel basin, starting to stir at low speed of 300 r/min, sequentially adding an organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) and a coupling agent KH-560, adjusting to control indexes such as viscosity, solid content and the like until the qualified mortar is obtained, starting to stir at high speed (1500 r/min) after the qualified mortar is obtained, and stirring for 20 minutes. The preparation of the curing agent comprises the following steps:
the curing agent D8115A and organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) were added to a stainless steel basin and stirred for 10 minutes. And obtaining a product, and detecting according to the control index.
Example 2
The automobile lightweight aluminum substrate coating consists of a main agent and a curing agent, wherein the weight part ratio of the main agent to the curing agent is 100;
the main raw materials of the main agent are as follows:
modified epoxy resin 38
dispersant/BYK-163 0.20
Bentonite paste 8.44
Titanium dioxide/R6618T 13.45
Zinc phosphate 14.0
Talcum powder/400 mesh 10.66
Ground calcium carbonate/600 mesh 3.10
Organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) 11.65
Coupling agent KH-560.5
The bentonite paste in the raw materials is prepared from the following components in percentage by weight:
bentonite A307 10
Ethanol 5
Organic solvent xylene 85
The main raw materials of the curing agent are as follows:
organic solvent xylene 43.21
Organic solvent n-butanol 11.01
Polyamide curing agent D8115A 45.78
A main agent:
(1) Preparing lacquer pulp: adding modified epoxy resin, organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio), stirring at low speed (500 r/min), slowly adding dispersant BYK-163, bentonite paste, pigment, filler and a proper amount of organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) in sequence, stirring at high speed (1500 r/min) after adding, and stirring for 1 hour. Grinding the mixture upwards, and grinding the mixture to be qualified according to the fineness requirement;
(2) Preparing finished paint: transferring the grinded qualified mortar to a finished product tank or a stainless steel basin, starting to stir at low speed of 300 r/min, sequentially adding an organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) and a coupling agent KH-560, adjusting to control indexes such as viscosity, solid content and the like until the qualified mortar is obtained, starting to stir at high speed (1500 r/min) after the qualified mortar is obtained, and stirring for 20 minutes. The preparation of the curing agent comprises the following steps:
the curing agent D8115A and organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) were added to a stainless steel basin and stirred for 10 minutes. And obtaining a product, and detecting according to the control index.
The main technical parameters are as follows:
the detection result shows that the modified epoxy resin coating obtained by grafting the electron-rich group on the epoxy resin can achieve excellent adhesion on an aluminum base material, and particularly, the primary amine-based epoxy resin coating shows more excellent adhesion while maintaining excellent performances of flexibility, water resistance, acid and alkali resistance, salt fog resistance and the like of a coating film.
The coating prepared by the invention is used in the example of the actual light aluminum substrate of the automobile:
and (4) conclusion: the automobile lightweight aluminum substrate coating is prepared by reasonably matching modified epoxy resin, filler, coupling agent, curing agent and organic solvent. Particularly, the key problem of poor adhesive force of the automobile lightweight aluminum base material coating is solved by preparing the modified epoxy resin coating by grafting the epoxy resin rich in electronic groups. The invention optimally selects the modified epoxy resin and the polyamide curing agent, has good adhesive force after the coating reaction, and simultaneously has very high crosslinking density, thereby ensuring that the coating is relatively compact and firm, has high hardness and has toughness. The automobile lightweight aluminum base material coating is suitable for application in the automobile lightweight development process, and effectively promotes the development of automobile lightweight.
Claims (3)
1. The automobile lightweight aluminum substrate coating is characterized by comprising a main agent and a curing agent, wherein the weight part ratio of the main agent to the curing agent is 100:18-22;
the main agent comprises the following raw materials in percentage by weight:
34-38 parts of modified epoxy resin
dispersant/BYK-163 0.15-0.25 part
7-9 parts of bentonite paste
Titanium dioxide/R6618T 10-15 parts
Zinc phosphate 11-16 parts
Talcum powder/400 mesh 11-16 parts
2-5 parts of heavy calcium carbonate/600 meshes
Organic solvent xylene/organic solvent n-butanol =7/3 (volume ratio) 10-13 parts
0.45 to 0.65 portion of coupling agent KH-560
The bentonite paste in the raw materials is prepared from the following components in percentage by weight:
8-10 parts of bentonite A307
3-5 parts of ethanol
85-89 parts of organic solvent dimethylbenzene
The main raw materials of the curing agent are as follows:
43-46 parts of organic solvent xylene
10-13 parts of organic solvent n-butanol
Polyamide curing agent D8115A 41-47 parts
The modified epoxy resin refers to: primary amine epoxy resin, secondary amine epoxy resin and chlorine-containing epoxy resin; wherein:
(1) Preparing primary amino epoxy resin: weighing bisphenol A epoxy resin, dissolving the bisphenol A epoxy resin in water, dropwise adding concentrated ammonia water into the bisphenol A epoxy resin to ensure that the concentration of the ammonia water in a reaction solution is 20-25%, stirring and reacting at a constant temperature of 60-80 ℃ for 2-4 h to obtain modified amino epoxy resin, wherein the mass ratio of the concentrated ammonia water to the bisphenol A epoxy resin is 10-15;
(2) Preparation of secondary amino epoxy resin: weighing bisphenol A epoxy resin, dissolving the bisphenol A epoxy resin in water, dropwise adding methylamine into the bisphenol A epoxy resin, stirring at the constant temperature of 40-60 ℃ and reacting for 10-12 h to obtain modified secondary amino epoxy resin, wherein the mass ratio of methylamine to bisphenol A epoxy resin is 5-10;
(3) Preparing chlorine-containing epoxy resin: weighing bisphenol A epoxy resin, dissolving the bisphenol A epoxy resin in water, dropwise adding 5 mol/L hydrochloric acid into the bisphenol A epoxy resin, stirring at a constant temperature of 40-60 ℃ for reacting for 1-2 h to obtain the modified chlorine-containing epoxy resin, wherein the mass ratio of HCl to bisphenol A epoxy resin is 5-10.
2. The preparation method of the automobile lightweight aluminum substrate coating as set forth in claim 1, which is characterized by comprising the steps of:
preparation of the main agent:
(1) Preparing lacquer pulp: adding modified epoxy resin, organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) into a mixing tank, stirring at low speed of 300-500 r/min, slowly adding dispersant BYK-163, bentonite paste, pigment, filler and a proper amount of organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) in sequence, grinding and grinding until the product is qualified according to the fineness requirement;
(2) Preparing finished paint: transferring the grinded qualified paint paste to a finished product tank or a stainless steel basin, starting to stir at low speed of 300-500 r/min, sequentially adding an organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) and a coupling agent KH-560, adjusting the viscosity and the solid content control index to be qualified, starting to stir at high speed of 1200-1500 r/min after being qualified, and stirring for 20 minutes;
the preparation of the curing agent comprises the following steps:
(3) Adding the curing agent D8115A and the organic solvent xylene/organic solvent n-butyl alcohol =7/3 (volume ratio) into a stainless steel basin, and stirring for 10 minutes to obtain a finished product.
3. Use of the automotive light-weight aluminum substrate coating of claim 1 for improving the adhesion of a paint film to an aluminum substrate.
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