CN116285466B - Composite conductive agent for conductive powder coating and conductive powder coating - Google Patents
Composite conductive agent for conductive powder coating and conductive powder coating Download PDFInfo
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- CN116285466B CN116285466B CN202310297261.3A CN202310297261A CN116285466B CN 116285466 B CN116285466 B CN 116285466B CN 202310297261 A CN202310297261 A CN 202310297261A CN 116285466 B CN116285466 B CN 116285466B
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- 239000006258 conductive agent Substances 0.000 title claims abstract description 48
- 229920000767 polyaniline Polymers 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 22
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 22
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- 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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a composite conductive agent for conductive powder coating, which is formed by compounding red mud, polyaniline and nano cerium oxide. The invention also provides a conductive powder coating, which is prepared from the following raw materials in parts by weight: 300-400 parts of epoxy resin, 200-300 parts of unsaturated polyester resin, 50-60 parts of flatting agent, 20-30 parts of flatting agent, 1-3 parts of white carbon black, 30-40 parts of pigment and 200-400 parts of composite conductive agent. According to the invention, the red mud and polyaniline and nano cerium oxide are compounded to prepare the composite conductive agent as the filler of the conductive powder coating, so that waste is turned into wealth, the resource waste and the burden on the environment are reduced, and the conductive performance of the powder coating can be improved.
Description
Technical Field
The invention belongs to the technical field of conductive powder coating preparation, and particularly relates to a composite conductive agent for conductive powder coating and the conductive powder coating.
Background
The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like. Unlike common solvent-based paint and water-based paint, its dispersion medium is not solvent and water, but air. It has the characteristics of no solvent pollution, 100% film formation and low energy consumption. Powder coatings are of two general classes, thermoplastic and thermosetting. Thermoplastic powder coatings have poor film appearance (gloss and leveling property) and poor adhesion to metals, so the thermoplastic powder coatings have few applications in the field of automotive coating, and thermosetting powder coatings are generally used for automotive coating, wherein thermosetting synthetic resins are used as film forming substances, and the thermosetting powder coatings are formed into flat and hard films by melting the resins in the drying process and then curing the resins after chemical crosslinking. The paint film formed by the paint can meet the requirements of automobile coating on appearance and various mechanical properties and corrosion resistance. Powder coatings are typically insulating (typically >1012 Ω in resistance), but in some special applications, such as mine pipe applications, excellent electrical conductivity is required, typically with a surface resistance of 106 Ω or less. The metal conductive paint using silver, copper, nickel and the like as fillers has the advantages of high conductivity, good shielding performance and the like, but has the defects of large filling quantity, poor oxidation resistance, high cost and the like. Compared with the carbon-based conductive filler, the carbon-based conductive filler has the advantages of good conductive performance, stable performance, wide source, low price and the like, and is widely used in the industries of national defense, electronics, petrochemical industry and the like due to the excellent conductive performance, heat conduction performance, corrosion resistance and the like.
Chinese patent CN 115466558A discloses a conductive powder coating and a preparation method thereof, which belongs to the technical field of powder coating. The conductive powder coating consists of the following raw materials in parts by weight: 30-40 parts of epoxy, 30-40 parts of resin, 1-3 parts of polyester resin, 0.5-1.5 parts of conductive agent, 0.1-3 parts of flatting agent, 15-20 parts of pigment and 10-15 parts of filler; the conductive agent consists of an average particle diameter D50: the 3-6nm monolayer nano-scale graphene is mixed with aluminum hydroxide. The preparation method of the conductive powder coating comprises the following steps: weighing the raw materials in proportion, premixing for 3-5 minutes by a turnover mixer, melting and extruding the premixed materials by an extruder, cooling into tablets by a tablet press, and crushing into powder particles of 30-50 microns by a pulverizer. The conductive powder coating has excellent corrosion resistance, conductivity and light color decoration.
Chinese patent CN115558381a discloses an antistatic powder coating composition comprising, in parts by mass: 52-56 parts of epoxy resin, 9.5-11 parts of epoxy resin curing agent, 2-4 parts of leveling auxiliary agent, 3-6 parts of antirust auxiliary agent, 0.2-1 part of conductive auxiliary agent and 25-35 parts of pigment and filler. The conductive auxiliary agent is selected from carbon nano tubes and/or conductive particles; preferably, the carbon nanotubes are single-walled carbon nanotubes. The invention also relates to a preparation method and application of the antistatic powder coating composition. The coating prepared by the antistatic powder coating composition can control the resistivity to be 1X 102 to 1X 105 omega-m, and has good conductive property; meanwhile, the coating prepared by the antistatic powder coating composition has good mechanical property and leveling property, and can be directly adjusted to be standard mark color according to industry requirements.
Chinese patent CN113321962B discloses an antistatic powder coating comprising carboxyl-terminated polyester resin a, carboxyl-terminated polyester resin B, triglycidyl isocyanurate, a dispersant, conductive carbon black, carbon nanotubes, a stiffening filler, a leveling agent, a first auxiliary agent, a second auxiliary agent, a brightening agent, benzoin, polytetrafluoroethylene and a pigment; according to the preparation method, after the hardening filler is mixed with the modified wax and the carboxylic acid derivative, the dispersion degree and the compatibility of the hardening filler in the powder coating system are improved, polyacrylate is combined as a surface auxiliary agent for use, the leveling property and the defoaming effect of the powder coating system are obviously improved, the synergy is achieved, and the antistatic performance of the prepared powder coating is obviously improved; in this patent, carbon nanotubes and carbon black are present in the powder coating system as a fine particle reinforcement phase, and the weatherability of the coating remains excellent for long periods of use under the interaction of the ingredients.
However, the carbon-based conductive coating has the problems of large filling amount of conductive carbon black, uneven dispersion, large oil absorption, limited coating color and the like. The organic conductive agent can overcome the defects of the metal conductive filler and the carbon conductive filler, and has been widely paid attention in recent years.
Chinese patent CN107400383B discloses a pearlescent pigment directly used for powder spraying and a preparation method thereof. The method of the patent is to coat a thin conductive polymer transparent layer such as polyaniline PAN, polypyrrole PPy, polythiophene PTh and the like on the surface of pearlescent pigment prepared from flaky substrates such as flaky natural mica, flaky synthetic mica, flaky alumina, flaky silica, flaky glass flakes and the like, so that the matching problem with the conductivity of resin in powder paint is ensured, the brightness and the color of powder spraying are ensured, the binding step of the pearlescent pigment in the powder paint is reduced, the utilization rate of the pearlescent pigment is improved, the process is simplified, and the cost is reduced.
Red mud is a residue produced after alumina is leached out from bauxite by strong alkali, china is large country for alumina production, and the alumina yield is more than about 1/3 of the total global quantity. The red mud is formed by washing and discharging tails in the production process of alumina, and extremely fine particle waste with strong alkalinity and radiation is increased year by year due to the continuous increase of the alumina productivity in China. The output of red mud is different according to the influence of factors such as ore grade, production process, technical conditions and the like. Each 1 ton of alumina can additionally produce 0.8 to 1.5 tons of red mud, and the accumulated accumulation of red mud in China reaches hundreds of millions of tons at present. Most of alumina factories adopt sea dumping and damming stacking, and most of the alumina factories adopt open-air damming stacking measures in China. The red mud contains various heavy metals, and in the discharge process, caustic alkali cannot be completely removed. Although the substances have no direct harm to human bodies, the substances are easy to permeate into the soil to cause land salinization and enter underground water, the pH value change of the water body can influence the toxicity of compounds in the water to cause harm to the environment, and the substances enter the human bodies along with the underground water and can necessarily influence the health of people. In the alumina production process, red mud particles are suspended in sodium aluminate solution, so that the method has the characteristic of small particle size; because the pH value of the red mud is very high, plants near the storage yard cannot survive, and dust is easy to generate to pollute the atmosphere when the red mud blows. Therefore, the dam building and stacking not only occupies a large amount of land resources, but also causes salinization and groundwater pollution of the surrounding land of the storage yard due to caustic alkali and heavy metal ions in the red mud.
At present, the recycling utilization of the red mud is mainly used as a building material raw material for producing cement, red mud bricks and aerated concrete, or producing a silicon-calcium compound fertilizer, recovering valuable metals and the like, and the overall utilization level is low. The stacking of a large amount of red mud has great influence on the production and life of human beings, so that the realization of multi-channel recycling treatment of the red mud is urgent. At present, the research on preparing conductive powder coating by taking red mud as a filler is relatively few.
Disclosure of Invention
Aiming at the problems, the invention provides the composite conductive agent for the conductive powder coating, which is prepared by compounding red mud, polyaniline and nano cerium oxide as a filler of the conductive powder coating, so that waste is turned into wealth, the resource waste and the burden on the environment are reduced, and the conductive performance of the powder coating can be improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a composite conductive agent for conductive powder coating is prepared by compounding red mud, polyaniline and nano cerium oxide.
Preferably, the preparation method of the composite conductive agent for the conductive powder coating comprises the following steps:
mixing 480-520 g of red mud with 100g of cerium oxide, and then transferring the mixture into a ball mill for ball milling to obtain a mixture; then suspending the mixture in HCl solution, injecting 1.0g of aniline, adding 2.45-3.99 g (NH) after pre-stirring 4 ) 2 S 2 O 8 Continuously stirring, filtering, washing and drying to obtain the product.
Preferably, the concentration of the HCl solution is 1mol/L.
Preferably, the ball milling time is 30min.
Preferably, the pre-stirring time is 2 hours, and the continuous stirring time is 24 hours.
The invention also provides a conductive powder coating, which is applied with the composite conductive agent and comprises the following raw materials in parts by weight:
300-400 parts of epoxy resin, 200-300 parts of unsaturated polyester resin, 50-60 parts of flatting agent, 20-30 parts of flatting agent, 1-3 parts of white carbon black, 30-40 parts of pigment and 200-400 parts of composite conductive agent.
Preferably, the epoxy resin is hydrogenated bisphenol A epoxy resin ST-3000.
Preferably, the matting agent is a pure polyester matting resin RB608.
Preferably, the leveling agent is a PV88 leveling agent.
Preferably, the pigment is titanium dioxide.
The preparation method of the conductive powder coating comprises the following steps:
A. mixing raw materials: mixing epoxy resin, unsaturated polyester resin, flatting agent, white carbon black, pigment and filler according to parts by weight, then respectively adding into a mixer, pre-crushing, and then uniformly mixing;
B. melt extrusion: the raw materials which are uniformly mixed in the step A are put into an extruder, and are subjected to melt extrusion, tabletting and cooling, and then crushed into tablets;
C. grinding and crushing: and B, placing the crushed sheet material in the step B into an ACM pulverizer for pulverizing, and performing cyclone separation and screening to obtain the conductive powder coating.
The invention has the following beneficial effects:
(1) The polyaniline is used as a basic raw material of the conductive agent, contains specific polar groups, is convenient for carrier flow, has good conductivity, has physical shielding effect on metal ions, can form a layer of hydrophobic adsorption film, and delays corrosion of metals; in the environment where water and oxygen exist, the polyaniline and metal can undergo oxidation-reduction reaction when being contacted, and a layer of compact metal oxide film is formed at the interface, so that the anode protection function is realized. The polymer nano particle has excellent characteristics on the structure, small size, quantum effect and surface effect generated by high specific surface area, and the like; the rare earth oxide nano particles have unique optical and other physical and chemical characteristics, and the rare earth oxide nano particles have synergistic effect by combining the rare earth oxide nano particles with the optical and other physical and chemical characteristics, so that the resistance of the coating can be effectively reduced; the initiator is used to make monomer aniline produce polymerization reaction in inorganic matter suspension to produce polyaniline, and the produced polyaniline is generally in two-phase uniform 'core-shell' structure, in which the inorganic matter is core-positioned, and the polyaniline is shell-tightly covered outside, and said composite mode can greatly overcome the defect of that polyaniline is insoluble and indissolvable.
(2) It is known that physical properties such as the size, specific surface area, surface functional groups and the like of the red mud play an important role in improving the thermal performance or the mechanical performance of the composite material, but the alkalinity of the red mud is too high, hydrochloric acid is adopted to modify the red mud in the compounding process of the red mud and polyaniline, so that the conductivity of the polyaniline is enhanced, and the red mud can generate acidic functional groups or active hydrogen to increase the interaction between the red mud and the polyaniline due to the action of the hydrochloric acid; the oxides in the red mud can also interact with polyaniline, and as a result of the various actions, the conductivity is enhanced compared to pure polyaniline.
(3) According to the invention, nano cerium oxide particles are inlaid on the surfaces of red mud particles through high-speed mechanical impact to form composite particles, and cerium oxide is inorganic particles, so that the thixotropic property of the red mud can be improved and the mechanical property can be improved; the red mud can be used as a carrier of cerium oxide to form a complex with strong adsorptivity, and polyaniline generated by reaction not only is included on the surface of the complex, but also can enter the complex to form a tighter structure, so that the overall conductivity is improved.
(4) Therefore, the invention adopts red mud, nano cerium oxide and polyaniline to compound, has multiple synergistic effects, and has good enhancement effect on the conductive effect of the prepared conductive powder coating.
Detailed Description
For a better understanding of the present invention, reference is made to the following examples, which are included within the scope of the present invention, but are not intended to limit the scope of the present invention.
Example 1
A composite conductive agent for conductive powder coating is prepared by compounding red mud, polyaniline and nano cerium oxide.
The preparation method of the composite conductive agent for the conductive powder coating comprises the following steps:
480g of red mud and 100g of cerium oxide are mixed and then transferred into a ball mill for ball milling for 30min, so as to obtain a mixture; then the mixture was suspended in 1mol/L HCl solution, and 1.0g of aniline was injected, followed by pre-stirring with an electromagnetic stirrer for 2 hours and then adding 2.45g (NH) 4 ) 2 S 2 O 8 Stirring for 24h, filtering, washing, and oven drying.
The conductive powder coating provided by the invention is applied with the composite conductive agent, and comprises the following raw materials in parts by weight:
the composite conductive material comprises, by weight, ST-3000400 parts of hydrogenated bisphenol A epoxy resin, 200 parts of unsaturated polyester resin, 60850 parts of pure polyester matting resin, 20 parts of PV88 leveling agent, 2 parts of white carbon black, 30 parts of titanium dioxide and 200 parts of composite conductive agent.
The red mud is Bayer process red mud provided by Guangxi certain aluminum industry company, the main components and the mass percentage thereof are shown in table 1, and the pH value is 12.7 through detection.
Table 1 table of main chemical composition of red mud
The preparation method of the conductive powder coating comprises the following steps:
A. mixing raw materials: mixing hydrogenated bisphenol A epoxy resin, unsaturated polyester resin, pure polyester extinction resin RB608, PV88 flatting agent, white carbon black, titanium pigment and filler according to parts by weight, respectively adding into a mixer, pre-crushing, and uniformly mixing;
B. melt extrusion: the raw materials which are uniformly mixed in the step A are put into an extruder, and are subjected to melt extrusion, tabletting and cooling, and then crushed into tablets; the temperature of the melt extrusion is 105-110 ℃, wherein the temperature of the zone I is 105 ℃, and the temperature of the zone II is 110 ℃;
C. grinding and crushing: and B, grinding the crushed sheet materials in the step B in an ACM grinding machine, and performing cyclone separation and screening to obtain the conductive powder coating with the level average particle size of 35.5 mu m.
Example 2
A composite conductive agent for conductive powder coating is prepared by compounding red mud, polyaniline and nano cerium oxide.
The preparation method of the composite conductive agent for the conductive powder coating comprises the following steps:
mixing 500g of red mud with 100g of cerium oxide, and transferring into a ball mill for ball milling for 30min to obtain a mixture; then the mixture was suspended in 1mol/L HCl solution, and 1.0g of aniline was injected, followed by pre-stirring with an electromagnetic stirrer for 2 hours and then adding 3.25g (NH) 4 ) 2 S 2 O 8 Stirring for 24h, filtering, washing, and oven drying.
The conductive powder coating provided by the invention is applied with the composite conductive agent, and comprises the following raw materials in parts by weight:
the composite conductive material comprises, by weight, ST-3000350 parts of hydrogenated bisphenol A epoxy resin, 270 parts of unsaturated polyester resin, 60858 parts of pure polyester matting resin, 25 parts of PV88 leveling agent, 3 parts of white carbon black, 35 parts of titanium dioxide and 300 parts of composite conductive agent.
The red mud used was the same as in example 1.
The preparation method of the conductive powder coating comprises the following steps:
A. mixing raw materials: mixing hydrogenated bisphenol A epoxy resin, unsaturated polyester resin, pure polyester extinction resin RB608, PV88 flatting agent, white carbon black, titanium pigment and filler according to parts by weight, respectively adding into a mixer, pre-crushing, and uniformly mixing;
B. melt extrusion: the raw materials which are uniformly mixed in the step A are put into an extruder, and are subjected to melt extrusion, tabletting and cooling, and then crushed into tablets; the temperature of the melt extrusion is 105-110 ℃, wherein the temperature of the zone I is 105 ℃, and the temperature of the zone II is 110 ℃;
C. grinding and crushing: and B, grinding the crushed sheet materials in the step B in an ACM grinding machine, and performing cyclone separation and screening to obtain the conductive powder coating with the level average particle size of 34.3 mu m.
Example 3
A composite conductive agent for conductive powder coating is prepared by compounding red mud, polyaniline and nano cerium oxide.
The preparation method of the composite conductive agent for the conductive powder coating comprises the following steps:
mixing 520g of red mud with 100g of cerium oxide, and transferring into a ball mill for ball milling for 30min to obtain a mixture; then the mixture was suspended in 1mol/L HCl solution, and 1.0g of aniline was injected, followed by pre-stirring with an electromagnetic stirrer for 2 hours and then adding 3.99g (NH) 4 ) 2 S 2 O 8 Stirring for 24h, filtering, washing, and oven drying.
The conductive powder coating provided by the invention is applied with the composite conductive agent, and comprises the following raw materials in parts by weight:
the composite conductive material comprises, by weight, ST-3000400 parts of hydrogenated bisphenol A epoxy resin, 300 parts of unsaturated polyester resin, 60860 parts of pure polyester matting resin, 30 parts of PV88 leveling agent, 1 part of white carbon black, 40 parts of titanium dioxide and 400 parts of composite conductive agent.
The red mud used was the same as in example 1.
The preparation method of the conductive powder coating comprises the following steps:
A. mixing raw materials: mixing hydrogenated bisphenol A epoxy resin, unsaturated polyester resin, pure polyester extinction resin RB608, PV88 flatting agent, white carbon black, titanium pigment and filler according to parts by weight, respectively adding into a mixer, pre-crushing, and uniformly mixing;
B. melt extrusion: the raw materials which are uniformly mixed in the step A are put into an extruder, and are subjected to melt extrusion, tabletting and cooling, and then crushed into tablets; the temperature of the melt extrusion is 105-110 ℃, wherein the temperature of the zone I is 105 ℃, and the temperature of the zone II is 110 ℃;
C. grinding and crushing: and B, grinding the crushed sheet materials in the step B in an ACM grinding machine, and performing cyclone separation and screening to obtain the conductive powder coating with the level average particle size of 37.2 mu m.
Comparative example 1
A conductive agent for conductive powder paint is prepared from polyaniline.
The preparation method comprises the following steps: dispersing 1.0g of aniline in a HCl solution with the concentration of 1mol/L, stirring for 2 hours, adding 3.25g of ammonium persulfate, continuously stirring for 24 hours, filtering, washing and drying to obtain the catalyst.
The conductive powder coating provided by the invention is prepared from the following raw materials in parts by weight:
the composite conductive material comprises, by weight, ST-3000350 parts of hydrogenated bisphenol A epoxy resin, 270 parts of unsaturated polyester resin, 60858 parts of pure polyester matting resin, 25 parts of PV88 leveling agent, 3 parts of white carbon black, 35 parts of titanium dioxide and 300 parts of composite conductive agent.
The red mud used was the same as in example 1.
The preparation method of the conductive powder coating of the present invention is the same as in example 2.
Comparative example 2
A composite conductive agent for conductive powder paint is prepared from red mud and polyaniline through compounding.
The preparation method of the composite conductive agent for the conductive powder coating comprises the following steps:
500g of red mud is suspended in HCl solution with the concentration of 1mol/L, 1.0g of aniline is injected, and 3.25g (NH) is added after pre-stirring for 2 hours by an electromagnetic stirrer 4 ) 2 S 2 O 8 Stirring for 24h, filtering, washing, and oven drying.
The conductive powder coating provided by the invention is applied with the composite conductive agent, and comprises the following raw materials in parts by weight:
the composite conductive material comprises, by weight, ST-3000350 parts of hydrogenated bisphenol A epoxy resin, 270 parts of unsaturated polyester resin, 60858 parts of pure polyester matting resin, 25 parts of PV88 leveling agent, 3 parts of white carbon black, 35 parts of titanium dioxide and 300 parts of composite conductive agent.
The red mud used was the same as in example 1.
The preparation method of the conductive powder coating of the invention is the same as in example 2.
Comparative example 3
A composite conductive agent for conductive powder paint is prepared from polyaniline and nano cerium oxide through compounding.
The preparation method of the composite conductive agent for the conductive powder coating comprises the following steps:
100g of cerium oxide was suspended in 1mol/L HCl solution, 1.0g of aniline was injected, and 3.25g (NH) was added after 2 hours of pre-stirring with an electromagnetic stirrer 4 ) 2 S 2 O 8 Stirring for 24h, filtering, washing, and oven drying.
The conductive powder coating provided by the invention is applied with the composite conductive agent, and comprises the following raw materials in parts by weight:
the composite conductive material comprises, by weight, ST-3000350 parts of hydrogenated bisphenol A epoxy resin, 270 parts of unsaturated polyester resin, 60858 parts of pure polyester matting resin, 25 parts of PV88 leveling agent, 3 parts of white carbon black, 35 parts of titanium dioxide and 300 parts of composite conductive agent.
The red mud used was the same as in example 1.
The preparation method of the conductive powder coating of the invention is the same as in example 2.
1. Conductivity contrast experiment
The composite conductive agent of example 2 and the conductive agents prepared in comparative examples 1 to 3 were subjected to conductive property test, the test standard was SJ/T10694-2006, and the results are shown in Table 2.
Table 2 results of the conductivity test of each group
| Group of | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Conductivity (S/cm) | 6.22 | 0.52 | 3.99 | 2.17 |
From the above table, it can be seen that:
the composite conductive agent of example 2 of the present invention had the highest conductivity, indicating the best conductivity. The conductive agent of comparative example 1 was free of red mud and nano cerium oxide, and had the lowest conductivity, indicating poor conductivity; compared with comparative example 1, the comparative example 2 and the comparative example 3 respectively increase the red mud and the nano cerium oxide, the conductivity is greatly increased, but the sum of the increment of the two is still lower than that of the comparative example 1, which indicates that the red mud and the nano cerium oxide can synergistically improve the conductivity of the composite conductive agent.
2. Conductive powder coating performance comparison experiment
Performance tests on the conductive powder coatings prepared in examples 1 to 3 and comparative examples 1 to 3 are shown in table 3:
table 3 items of performance testing
The results are shown in Table 4 below.
Table 4 results of Performance test of powder coatings prepared from groups
From the above table, it can be seen that:
each of the indexes of examples 1 to 3 of the present invention was excellent, and example 2 was the most preferable. In terms of impact resistance, the impact resistance of example 2 reached 93kg/cm, and the impact resistance of the conductive powder coatings of comparative examples 1 to 3 were all smaller than that of example 2; no significant differences in flexural resistance were seen for each group; indentation hardness, adhesive force, moist heat resistance, neutral salt fog resistance and weather resistance, and all groups meet the test standard; wherein, the light retention rate of neutral salt fog resistance is 85% in example 2, and the light retention rate of comparative examples 1-3 is reduced to a certain extent.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A composite conductive agent for conductive powder coatings, characterized in that: from red mud, polyaniline and sodiumThe rice cerium oxide is compounded; the preparation method comprises the following steps: mixing 480-520 g of red mud with 100g of nano cerium oxide, and then transferring the mixture into a ball mill for ball milling to obtain a mixture; then suspending the mixture in HCl solution, injecting 1.0g of aniline, pre-stirring, and adding 2.45-3.99 g (NH) 4 ) 2 S 2 O 8 Continuously stirring, filtering, washing and drying to obtain the product.
2. The composite conductive agent for conductive powder coating according to claim 1, wherein: the concentration of the HCl solution is 1mol/L.
3. The composite conductive agent for conductive powder coating according to claim 1, wherein: the ball milling time is 30min.
4. The composite conductive agent for conductive powder coating according to claim 1, wherein: the pre-stirring time is 2 hours, and the continuous stirring time is 24 hours.
5. A conductive powder coating, characterized in that the composite conductive agent as claimed in any one of claims 1 to 4 is applied, comprising the following raw materials in parts by weight:
300-400 parts of epoxy resin, 200-300 parts of unsaturated polyester resin, 50-60 parts of flatting agent, 20-30 parts of flatting agent, 1-3 parts of white carbon black, 30-40 parts of pigment and 200-400 parts of composite conductive agent.
6. The conductive powder coating of claim 5, wherein: the epoxy resin is hydrogenated bisphenol A epoxy resin ST-3000.
7. The conductive powder coating of claim 5, wherein: the matting agent is pure polyester matting resin RB608.
8. The conductive powder coating of claim 5, wherein: the leveling agent is a PV88 leveling agent.
9. The conductive powder coating of claim 5, wherein: the pigment is titanium dioxide.
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