Graphene painting with anti-corrosion and heat dissipation properties

Abstract

The invention pertains to a graphene painting. The graphene painting comprises: a component A and a component B, the component A includes 40 to 50 parts by weight of epoxy resin, 6 to 10 parts by weight of acrylic resin, 15 to 20 parts by weight of zinc powder, 0.4 to 2 parts by weight of graphene, 2 to 5 parts by weight of dispersant, 0.5 to 4 parts by weight of coupling agent, 1 to 3 parts by weight of leveling agent, 6 to 10 parts by weight of filler, 9 to 14 parts by weight of synergist, 22 to 30 parts by weight of solvent; the component B includes 1 to 4 parts by weight of curing agent, 3 to 5 parts by weight of diluent. The graphene painting is coated on the surface of a magnet, which improves the corrosion resistance of the magnet and heat dissipation performance.

Claims

1. A graphene paint with anti-corrosion and heat dissipation properties, comprising: a component A, the component A comprises: 40 to 50 parts by weight of epoxy resin, 6 to 10 parts by weight of acrylic resin, 15 to 20 parts by weight of zinc powder, 0.4 to 2 parts by weight of graphene, 2 to 5 parts by weight of dispersant, 0.5 to 4 parts by weight of coupling agent, 1 to 3 parts by weight of leveling agent, 6 to 10 parts by weight of filler, 9 to 14 parts by weight of synergist, 22 to 30 parts by weight of solvent; a component B, component B comprises: 1 to 4 parts by weight of curing agent, 3 to 5 parts by weight of diluent, and the parts by weight of materials present in component A or B are relative to the combined materials of components A and B.

2. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the filler is selected from at least one of the following fillers: mica powder, calcium carbonate and talcum powder.

3. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the epoxy resin is bisphenol A type epoxy resin.

4. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, the coupling agent is a silane coupling agent, the silane coupling agent is selected from at least one of the following silanes: γ-aminopropyltriethoxysilane, vinyltriethoxysilane and vinyltris(β-methoxyethoxy) silane.

5. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the dispersant is selected from at least one of the following compounds: polyacrylate, sodium polycarboxylate and sodium carboxylate.

6. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the leveling agent is selected from at least one of the following compounds: polydimethylsiloxane and cellulose acetate-butyrate.

7. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the preparation method of each said synergist includes the following steps: mixing 9 to 12 weight percent of nano alumina, 7 to 10 weight percent of PVDF resin, 5 to 7 weight percent of maleic anhydride grafted ethylene copolymer, 4 to 7 weight percent of γ-glycidyletheroxypropyltrimethoxysilane with 20 to 30 weight percent of polyethylene glycol uniformly to obtain a mixture A; the mixture A is stirred at 80° C. to 95° C., for 60 minutes to 90 minutes; the mixture is then ultrasonically dispersed, centrifuged, washed, and dried to obtain the synergist.

8. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the curing agent is selected from at least one of the following compounds: diethylenetriamine, triethylenetetramine, diethylaminopropylamine and 2,4,6-tris(dimethylaminomethyl) phenol.

9. The graphene paint with anti-corrosion and heat dissipation properties of claim 1, wherein the diluent is selected from at least one of the following compounds: xylene, ethanol, glycidylneodecanoate, and 1,4 butanediol glycidyl ether.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

(2) FIG. 1 is an effect image of the graphene painting partially coated on a NdFeB magnet with chromium plating and non-magnetization according to the first embodiment.

(3) FIG. 2 is an effect image of the graphene painting partially coated on a NdFeB magnet free of chromium plating and non-magnetization according to the first embodiment.

DETAILED DESCRIPTION OF THE INVENTION

(4) The invention will be further described below in details with reference to the figures and embodiments.

The First Embodiment

(5) A graphene painting with anti-corrosion and heat dissipation properties, comprising: a component A and a component B, the component A includes 45 parts by weight of epoxy resin, 8 parts by weight of acrylic resin, 17 parts by weight of zinc powder, 1 parts by weight of graphene, 3 parts by weight of dispersant, 2 parts by weight of coupling agent, 2 parts by weight of leveling agent, 7 parts by weight of filler, 12 parts by weight of synergist, 25 parts by weight of solvent; the component B includes 2 parts by weight of curing agent, 4 parts by weight of diluent.

(6) Furtherly, the filler is composed of mica powder, calcium carbonate and talcum powder based on a weight ratio of 1.5:1:1. The filler has a diameter of 50 nm to 100 nm. The epoxy resin is a bisphenol A epoxy resin E44. The solvent is composed of butanol, xylene and 1,4-butanediol glycidyl ether based on a weight ratio of 4:1:1. The acrylic resin is acrylic resin DS8030-TB.

(7) Furtherly, the coupling agent is a silane coupling agent. The silane coupling agent is composed of γ-aminopropyltriethoxysilane and vinyltris (β-methoxyethoxy) silane based on a weight ratio of 1:1.

(8) Furtherly, the dispersant is sodium polycarboxylate dispersant SN-5040 or sodium polyacrylate dispersant Dispersant-9100. The leveling agent is composed of polydimethylsiloxane and cellulose acetate-butyrate based on a weight ratio of 1.2:1.

(9) Furtherly, the preparation method of each synergist includes the following steps: mixing 11 weight percent of nano alumina, 8 weight percent of PVDF resin, 6 weight percent of maleic anhydride grafted ethylene copolymer, and 5 weight percent of γ-Glycidyl ether oxypropyl trimethoxysilane with 25 weight percent of polyethylene glycol, a composition A is prepared after being stirred and mixed uniformly. The composition A was stirred at 85° C., hold for 75 minutes, followed by ultrasonic dispersion, centrifugal washing, and drying to obtain the synergist. The maleic anhydride grafted ethylene copolymer is maleic anhydride grafted ethylene copolymer VA1801. The PVDF resin is Kynar 761.

(10) Furtherly, the curing agent is composed of diethylenetriamine and 2,4,6-tris(dimethylaminomethyl) based on a weight ratio of 2:1.

(11) Furtherly, the diluent is composed of xylene, ethanol and glycidyl ether of capric acid based on a weight ratio of 0.6:1.8:1.

(12) The preparation method of the graphene painting with anti-corrosion and heat dissipation properties includes the following steps:

(13) Preparation of Component A:

(14) A1. proportionally mixing the graphene, the coupling agent, and the dispersant, evenly by stirring with a stirring raed of 1400 r/min, the stirring time lasts for 15 mins; then adding epoxy resin and acrylic resin and stirring at 68° C. for 30 mins to obtain resin graphene slurry;

(15) A2. Adding zinc powder, graphene, the dispersant, the leveling agent, the filler, and the synergist into the resin graphene slurry, and stirring at 68° C. for 30 minutes at a stirring rate of 1400 r/min to obtain a mixed slurry; the mixed slurry is grinded with a discharge fineness between 10 μm to 30 μm, and filtered to obtain the component A and ready for use.

(16) Preparation of Component B:

(17) Mixing the curing agent and the diluent, evenly by stirring at a stirring rate of 1400 r/min, the stirring time lasts for 15 mins to prepare component B, and ready for use.

(18) FIG. 1 is an effect image of the graphene painting partially coated on a NdFeB magnet with chromium plating and non-magnetization according to the first embodiment. The surface morphology of the coating in FIG. 1 is uniform, and the graphene is uniformly distributed. FIG. 2 is an effect image of the graphene painting partially coated on a NdFeB magnet free of chromium plating and non-magnetization according to the first embodiment. The surface morphology of the coating in FIG. 2 is also uniform, the graphene is uniformly distributed, and the surface adhesion is stronger.

The Second Embodiment

(19) A graphene painting with anti-corrosion and heat dissipation properties, comprising: a component A and a component B, the component A includes 40 parts by weight of epoxy resin, 6 parts by weight of acrylic resin, 15 parts by weight of zinc powder, 0.4 parts by weight of graphene, 2 parts by weight of dispersant, 0.5 parts by weight of coupling agent, 1 parts by weight of leveling agent, 6 parts by weight of filler, 9 parts by weight of synergist, 22 parts by weight of solvent; the component B includes 1 parts by weight of curing agent, 3 parts by weight of diluent.

(20) Furtherly, the filler is composed of mica powder, calcium carbonate and talcum powder based on a weight ratio of 1:0.8:1. The solvent is composed of butanol, xylene and 1,4-butanediol glycidyl ether based on a weight ratio of 3:0.8:1.

(21) Furtherly, the coupling agent is a silane coupling agent. The silane coupling agent is composed of γ-aminopropyltriethoxysilane and vinyltris (β-methoxyethoxy) silane based on a weight ratio of 2:1.

(22) Furtherly, the dispersant is sodium polyacrylate Dispersant-9100. The leveling agent is composed of polydimethylsiloxane and cellulose acetate-butyrate based on a weight ratio of 0.8:1.

(23) Furtherly, the preparation method of each synergist includes the following steps: mixing 9 weight percent of nano alumina, 7 weight percent of PVDF resin, 5 weight percent of maleic anhydride grafted ethylene copolymer, and 4 weight percent of γ-Glycidyl ether oxypropyl trimethoxysilane with 20 weight percent of polyethylene glycol, uniformly by stirring to prepare a mixture A. The mixture A was stirred at 80° C., for 90 minutes, followed by ultrasonic dispersion, centrifugal washing, and drying to obtain the synergist.

(24) Furtherly, the curing agent is composed of diethylenetriamine and 2,4,6-tris(dimethylaminomethyl) phenol based on a weight ratio of 1:1.5. The diluent is composed of xylene, ethanol and glycidyl ether of capric acid based on a weight ratio of 0.4:1.5:1.

(25) The preparation method of the graphene painting with anti-corrosion and heat dissipation properties includes the following steps:

(26) Preparation of Component A:

(27) A1. proportionally mixing the graphene, the coupling agent, and the dispersant, evenly by stirring with a stirring rate of 1000 r/min, the stirring time lasts for 15 mins; then adding epoxy resin and acrylic resin, stirring at 65° C. for 35 mins to obtain a resin graphene slurry;

(28) A2. Adding zinc powder, graphene, dispersant, leveling agent, filler, and synergist into the resin graphene slurry, and stirring at 68° C. for 30 minutes at a stirring rate of 1000 r/min to obtain a mixed slurry; the mixed slurry is grinded with a discharge fineness between 10 μm to 30 μm, and filtered to obtain the component A and ready for use.

(29) Preparation of Component B:

(30) Mixing the curing agent and the diluent, evenly by stirring at a stirring rate of 1000 r/min, the stirring time lasts for 20 mins and ready for use.

The Third Embodiment

(31) A graphene painting with anti-corrosion and heat dissipation properties, comprising: a component A and a component B, the component A includes 50 parts by weight of epoxy resin, 10 parts by weight of acrylic resin, 20 parts by weight of zinc powder, 0.4 parts by weight of graphene, 2 parts by weight of dispersant, 0.5 parts by weight of coupling agent, 1 parts by weight of leveling agent, 6 parts by weight of filler, 9 parts by weight of synergist, 22 parts by weight of solvent; the component B includes 1 parts by weight of curing agent, 3 parts by weight of diluent.

(32) Furtherly, the filler is composed of mica powder, calcium carbonate and talcum powder based on a weight ratio of 2:1.2:1. The solvent is composed of butanol, xylene and 1,4-butanediol glycidyl ether based on a weight ratio of 5:1.4:1.

(33) Furtherly, the silane coupling agent is composed of γ-aminopropyltriethoxysilane, vinyltriethoxysilane, and vinyl tris (β-methoxyethoxy) silane based on a weight ratio of 1:1:2.

(34) Furtherly, the dispersant is sodium polycarboxylate dispersant SN-5040. The leveling agent is composed of polydimethylsiloxane and cellulose acetate-butyrate based on a weight ratio of 2:1.

(35) Furtherly, the preparation method of each synergist includes the following steps: mixing 12 weight percent of nano alumina, 10 weight percent of PVDF resin, 7 weight percent of maleic anhydride grafted ethylene copolymer, and 7 weight percent of γ-Glycidyletheroxypropyltrimethoxysilane with 30 weight percent of polyethylene glycol uniformly by stirring to prepare a mixture A. The mixture A was stirred at 90° C., for 60 minutes, followed by ultrasonic dispersion, centrifugal washing, and drying to obtain the synergist.

(36) Furtherly, the curing agent is composed of diethylaminopropylamine and 2,4,6-tris (dimethylaminomethyl) phenol based on a weight ratio of 2:1.

(37) Furtherly, the diluent is composed of xylene, ethanol and glycidyl ether of capric acid based on a weight ratio of 0.8:2:1.

(38) The preparation method of the graphene painting with anti-corrosion and heat dissipation properties includes the following steps:

(39) Preparation of Component A:

(40) A1. proportionally mixing the graphene, the coupling agent, and the dispersant, evenly by stirring with a stirring rate of 1600 r/min, the stirring time lasts for 10 mins; then adding epoxy resin and acrylic resin, stirring at 70° C. for 20 mins to obtain a resin graphene slurry;

(41) A2. Adding zinc powder, graphene, dispersant, leveling agent, filler, and synergist into the resin graphene slurry, and stirring at 70° C. for 20 minutes at a stirring rate of 1600 r/min to obtain a mixed slurry; the mixed slurry is grinded with a discharge fineness between 10 μm to 30 μm, and filtered to obtain the component A and ready for use.

(42) Preparation of Component B:

(43) Mixing the curing agent and the diluent, evenly by stirring at a stirring rate of 1600 r/min, the stirring time lasts for 10 mins to obtain component B and ready for use.

The Fourth Embodiment

(44) A graphene painting with anti-corrosion and heat dissipation properties, comprising: a component A and a component B, the component A includes 46 parts by weight of epoxy resin, 7 parts by weight of acrylic resin, 16 parts by weight of zinc powder, 1.5 parts by weight of graphene, 3 parts by weight of dispersant, 3 parts by weight of coupling agent, 1.5 parts by weight of leveling agent, 7 parts by weight of filler, 11 parts by weight of synergist, 28 parts by weight of solvent; the component B includes 3 parts by weight of curing agent, 5 parts by weight of diluent.

(45) Furtherly, the filler is composed of mica powder, calcium carbonate and talcum powder based on a weight ratio of 1.5:1:1. The solvent is composed of butanol, xylene and 1,4-butanediol glycidyl ether based on a weight ratio of 3.5:1.2:1. The leveling agent is composed of polydimethylsiloxane and cellulose acetate-butyrate based on a weight ratio of 1.4:1. The dispersant is composed of sodium polycarboxylate dispersant SN-5040 and sodium polyacrylate dispersant Dispersant-9100 based on a weight ratio of 1.5:1.

(46) Furtherly, the preparation method of each synergist includes the following steps: mixing 11 weight percent of nano alumina, 8 weight percent of PVDF resin, 5.5 weight percent of maleic anhydride grafted ethylene copolymer, and 5 weight percent of γ-glycidyletheroxypropyltrimethoxysilane with 24 weight percent of polyethylene glycol uniformly by stirring to prepare a mixture A. The mixture A is stirred at 85° C., for 80 minutes, followed by ultrasonic dispersion, centrifugal washing, and drying to obtain the synergist.

(47) The preparation method of the graphene painting with anti-corrosion and heat dissipation properties includes the following steps:

(48) Preparation of Component A:

(49) A1. proportionally mixing the graphene, the coupling agent, and the dispersant, evenly by stirring with a stirring rate of 1500 r/min, the stirring time lasts for 15 mins; then adding epoxy resin and acrylic resin, and stirring at 68° C. for 25 mins to obtain a resin graphene slurry;

(50) A2. Adding zinc powder, graphene, dispersant, leveling agent, filler, and synergist into the resin graphene slurry, and stirring at 65° C. for 36 minutes at a stirring rate of 1300 r/min to obtain a mixed slurry; the mixed slurry is grinded with a discharge fineness between 10 μm to 30 μm, and filtered to obtain the component A and ready for use.

(51) Preparation of Component B:

(52) Mixing the curing agent and the diluent, evenly by stirring at a stirring rate of 1300 r/min, the stirring time lasts for 20 mins to obtain component B, and ready for use.

(53) Contents of the fourth embodiments of the present invention are similar to that of the first embodiment and for simplicity, they will not be repeated here.

Comparative Example 1

(54) The differences between the comparative example 1 and the first embodiment of the present invention is that: the comparative example 1 is free of the synergist, and is replaced by the same amount of epoxy resin and acrylic resin.

(55) The graphene painting with anti-corrosion and heat dissipation properties prepared in the first embodiment to the fourth embodiment and Comparative Example 1 were dipped, pulled, cured, and coated on the circular surface of the NdFeB magnet free of chromium plating to form a graphene coating with anti-corrosion and heat dissipation properties. The coating method includes the following steps immersing a magnet body in the ready graphene paint with anti-corrosion and heat dissipation properties; pulling the magnet body upwards after dipping in the graphene paint, the magnet body is then suspended above the graphene paint. Repeating the above immersing, dipping, and pulling processes and an initial film is formed on the surface of the magnet body. The immersion time is 30 s each time, and the suspension time of the magnet body after each pulling is 80 s, repeated 40 times. The speed of pulling the magnet body each time is 3 cm/min; the initial film of the magnet body is cured to obtain a magnet coated with the graphene paint with anti-corrosion and heat dissipation properties. The curing temperature is 90° C., and the curing time is 25 minutes.

(56) They are respectively tested according to HG/T 4759-2014. The performances are shown as below.

(57) The appearances of the coatings in the first embodiment to the fourth embodiment and Comparative Example 1 are smooth and particle-free, the flash rust inhibition is normal. In Comparative Example 1, the coating at the curved edge is relatively less. Water resistance/500 h: there is no blistering, no peeling, no rusting or no cracking in the first embodiment to the fourth embodiment and Comparative Example 1. Salt spray resistance/500 h: there is no blistering, no peeling, no rusting, or no cracking in the first embodiment to the fourth embodiment, however, there is blistering, slight peeling, and rusting in Comparative Example 1. Alkali resistance/240 h (50 g/L, NaOH): there is no blistering, no flaking, no rusting, and no cracking in the first embodiment to the fourth embodiment; however, it is slightly peeled and rusty. Acid resistance/36 h (50 g/L, H2SO4): there is no blistering, no peeling, no rusting, and no cracking in the first embodiment to the fourth embodiment; there is blistering in Comparative Example 1.

(58) The other performances of the first embodiment to the fourth embodiment and Comparative Example 1 are as follows:

(59) TABLE-US-00001 Comparative Item Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 example 1 Griding 1 1 1 1 2 test/grade Impact 55 55 55 55 50 resistance/cm Glossiness/grade 1 1 1 1 1

(60) The thickness of the graphene coating formed by the graphene paint with anti-corrosion and heat dissipation properties in the first embodiment to the fourth embodiment of the present invention is between 20 μm to 25 μm. The impact resistance test takes 5 cm as an interval. The graphene paint with anti-corrosion and heat dissipation properties according to the present invention is coated on the surface of the magnet, it has adhesion with the magnet. It also promotes the corrosion resistance of the magnet, improves the heat dissipation performance, prolongs the service life of the magnet, and enlarges its application range.

(61) The above embodiments, which are intended to enable those skilled in the art to understand the content of the disclosure and implement it accordingly, are merely for describing the technical concepts and features of the disclosure, and the scope of patent application of the disclosure cannot be defined only by the embodiments, i.e., any equivalent variations or modifications made in accordance with the spirit disclosed by the disclosure still fall within the scope of claims of the disclosure.