CN115960482A - Antistatic polyester finish paint and preparation method thereof - Google Patents

Abstract

The application relates to the technical field of building decoration materials, and particularly discloses an antistatic polyester finish paint and a preparation method thereof. The antistatic polyester finish paint is prepared from the following raw materials in parts by weight: 41-45 parts of polyester resin, 5-7 parts of melamine formaldehyde resin, 14-22 parts of solvent, 8-10 parts of composite conductive agent, 20-24 parts of pigment and filler and 8.3-16.5 parts of assistant; the composite conductive agent is graphene with conductive titanium dioxide adsorbed on the surface or a mixture of a graphene compound and an organic binder. According to the application, the antistatic property of the polyester finish paint is improved by adding the composite conductive agent.

Description

Antistatic polyester finish paint and preparation method thereof

Technical Field

The application relates to the technical field of building decoration materials, in particular to an antistatic polyester finish paint and a preparation method thereof.

Background

Static electricity is a problem in daily life, and is particularly obvious in dry winter. Static electricity is harmful and harmless to human bodies, and the phenomena of anxiety, headache, chest distress and the like can occur to the human bodies in the static environment for a long time.

Generally, in a room, the inner wall plate is most easily charged with static electricity, and the static electricity can be applied to the inner wall plate at the moment when a human body is in contact with the inner wall plate. The inner wallboard finish paint is the paint on the outermost layer of the coating, plays a main role in decoration and protection in a paint film, and shows the overall effect after coating through the layer, so that the inner wallboard finish paint has higher requirements on the used materials. When the existing coating is applied to an inner wallboard as finish paint, the generation of static electricity cannot be prevented, and poor experience is brought to people.

Therefore, improving the antistatic ability of the interior wall panel is of great significance to better development of the interior wall panel.

Disclosure of Invention

In order to improve the antistatic property of the inner wall board, the application provides an antistatic polyester finish paint and a preparation method thereof.

In a first aspect, the antistatic polyester finish paint provided by the application adopts the following technical scheme:

an antistatic polyester finish paint comprises the following raw materials in parts by weight: 41-45 parts of polyester resin, 5-7 parts of melamine formaldehyde resin, 14-22 parts of solvent, 8-10 parts of composite conductive agent, 20-24 parts of pigment and filler and 8.3-16.5 parts of auxiliary agent; the composite conductive agent is graphene with conductive titanium dioxide adsorbed on the surface or a mixture of a graphene compound and an organic binder.

By adopting the technical scheme, the polyester resin and the melamine-formaldehyde resin are subjected to a crosslinking reaction to form a net structure, so that the finish paint has good hardness, flexibility and durability; the conductive titanium dioxide is adsorbed on the surface of the graphene or graphene compound, so that the graphene or graphene compound is not easy to stack irreversibly when being mixed at the later stage, the obtained graphene or graphene compound with the surface adsorbed with the conductive titanium dioxide is easy to disperse, and the excellent conductivity of the conductive titanium dioxide and the graphene or graphene compound is fully exerted; meanwhile, the graphene or graphene compound with the conductive titanium dioxide adsorbed on the surface is treated by the organic binder, so that a network bridging effect is generated among particles, the binding property of the conductive titanium dioxide and the graphene or graphene compound is better, the dispersity and the conductivity of the composite conductive agent in the polyester finish paint are improved, the polyester finish paint has excellent antistatic property, and the antistatic property of the inner wall board coated with the polyester finish paint is improved.

Preferably, the graphene composite is a composite material of graphene and other carbon materials, and the other carbon materials are one or two of carbon nanotubes and conductive carbon black.

By adopting the technical scheme, the coordination number of carbon atoms in the graphene is 3, and the bond length between every two adjacent carbon atoms is 1.42 multiplied by 10 ^-10 m, the included angle between the keys is 120 degrees; in addition to the honeycomb-type layered structure in which the σ bond is linked with other carbon atoms to form a hexagonal ring, the pz orbit of each carbon atom perpendicular to the layer plane can form a large-pi bond (similar to a benzene ring) of multiple atoms throughout the entire layer, thus having excellent conductivity; the carbon nano tube has the same structure as the graphite sheet structure, so the carbon nano tube has good electrical property; the conductive carbon black has low resistance and can provide antistatic effect to the product. The graphene has a structure or a component similar to that of the carbon nano tube and the conductive carbon black, so that the composite property is good.

Preferably, the preparation method of the graphene composite comprises the following steps: mixing a modifier and a solvent to form a mixed solution, and adding graphene and other carbon materials into the mixed solution for mixing; the mass ratio of the modifier to the graphene to other carbon materials is (1-4): (9-10): (1-10).

By adopting the technical scheme, the preparation method is simple, the graphene and other carbon materials have good binding property, and the obtained graphene compound has good conductivity and adsorbability.

Preferably, the modifier is one or more of octadecylamine, sodium dodecyl benzene sulfonate and oleic acid.

By adopting the technical scheme, the octadecylamine, the sodium dodecyl benzene sulfonate and the oleic acid which are used as the surfactants have good surface activity and strong hydrophilicity, and can effectively reduce the interfacial tension, so that the graphene compound has a better adsorption effect on the conductive titanium dioxide.

Preferably, the organic binder is one or more of phenolic resin, epoxy resin, acrylic resin, silicone resin, fluorocarbon resin, vinyl chloride-vinyl acetate resin, polyester resin, vinyl resin, polyurethane resin, alkyd resin, aldehyde ketone resin, polyketone resin, nitrocellulose resin, ethyl cellulose, rosin, amber and shellac; more preferably a polyester resin.

By adopting the technical scheme, the organic binder can well bind the graphene or the graphene compound and the conductive titanium dioxide, so that the binding force between the graphene or the graphene compound and the conductive titanium dioxide is better, the dispersity of the composite conductive agent in a polyester finish paint system is improved, and the antistatic effect of the finish paint is improved. When the polyester resin is selected to treat the graphene or the graphene compound with the conductive titanium dioxide adsorbed on the surface, the obtained composite conductive agent has better bonding property with the polyester resin, the uniformity of the composite conductive agent in the finish paint is improved, and the antistatic property of the finish paint is improved.

Preferably, the preparation method of the composite conductive agent comprises the following steps: mixing the following components in percentage by mass (1-3): 2, mixing the graphene or the graphene composite with the conductive titanium dioxide to form graphene and graphene composite powder with the conductive titanium dioxide adsorbed on the surface; and (2) mixing the following components in percentage by mass: and (1-5) uniformly mixing the graphene or graphene compound powder with the surface adsorbed with the conductive titanium dioxide with a solvent and an organic binder.

By adopting the technical scheme, the preparation method is simple, the cost is low, and the prepared composite conductive agent has the advantages of good conductivity and long service life.

Preferably, the solvent comprises the following raw materials in parts by weight: 0.5-1.5 parts of N-methyl pyrrolidone, 4-6 parts of dibasic ester DBE, 4-6 parts of ether alcohol ester, 4-6 parts of Mobil aromatic hydrocarbon solvent oil and 1.5-2.5 parts of isobutanol.

By adopting the technical scheme, the N-methyl pyrrolidone is a good-grade solvent, is a polar solvent with strong selectivity and good stability, and has the advantages of low toxicity, high boiling point, strong dissolving power, nonflammability, biodegradability, recyclability and safe use.

The dibasic ester DBE is an environment-friendly high-boiling-point solvent which has low toxicity and low odor and can be biodegraded. The dibasic ester DBE has excellent solubility with resin, has good flow parallelism, can improve the glossiness of the finish, increase the flatness and density of the finish, reduce the defects of pinholes, orange peel, white mist cleaning and the like, can promote the flexibility and adhesive force of the finish, and has particularly good wettability to pigment fillers; has high boiling point, long distillation range, adjustable solvent volatilization rate, simple use and low cost.

The ether alcohol ester is a multifunctional medium and high boiling point oxygen-containing solvent, the molecule of the ether alcohol ester contains ether bond, ester bond and alkyl, and the polar part and the non-polar part in the same molecule are mutually restricted and excluded and respectively play the inherent role. The solvent-free finishing coat has the advantages of high dissolving power for polyester resin, high proportion miscibility for other solvents, low volatilization rate and the like, can keep good fluidity after most solvents are volatilized, and can improve the uniformity, glossiness and adhesive force of the finishing coat on a base material.

Mobil aromatic solvent oil has the characteristics of proper distillation range and volatility, strong dissolving power, low odor and the like, and exerts high dissolving power in the later stage of film forming, so that finish paint is smooth and has little orange peel.

The isobutanol is used as a solvent, so that the gloss and the fluidity of the finish paint can be improved, and the color fading of the finish paint can be prevented; the paint has the advantages of low corrosivity, weak hydrophilicity and low volatility, can reduce the viscosity of finish paint, improves the brush flow rate, and prevents petroleum residues from being generated on the surface of a substrate.

In conclusion, by adopting the solvents, the solvents are effectively complemented with each other, and the comprehensive performance of the finish paint is improved.

Preferably, the auxiliary agent comprises the following raw materials in parts by weight: 0.1-0.4 part of anti-settling agent, 0.5-0.7 part of p-toluenesulfonate catalyst, 2-3 parts of hardening agent, 1-1.5 parts of acrylic acid leveling agent, 1-3 parts of matting powder, 0.2-0.4 part of acrylic acid defoaming agent, 1-3 parts of PTFE wax, 0.5-1 part of ultraviolet absorbent, 1.5-2.5 parts of metal scratch resistant auxiliary agent and 0.5-1 part of acrylic acid dispersing agent.

By adopting the technical scheme, after the anti-settling agent is added into a finish paint system to form weakly-crosslinked three-dimensional network sections, the finish paint is endowed with good thixotropy, the external force is greater than the yield value of the thixotropy value under the action of a high-speed shearing rate, the weak crosslinking structure effect is destroyed, the viscosity of the finish paint is reduced, and the fluidity is improved, so that the finish paint is easy to construct; after the shearing force is removed, the weak crosslinking effect is recovered, the viscosity is raised back with proper hysteresis, so that the finish paint has good leveling property and sagging resistance, and finally the finish paint is recovered to the original thixotropic state to prevent the dispersed pigment and filler particles from settling and coagulating. Can prevent water loss and paint falling, improve the viscosity of the finish paint and improve the film coating performance of the finish paint.

The p-toluenesulfonate catalyst accelerates the film-forming curing reaction in a finish paint system, and does not cause side reactions such as oxidation or coking, so that the obtained product has high purity.

The hardener can promote the reaction of the polyester resin and the melamine formaldehyde resin to promote the filming of the finish paint, if the hardener is less than the hardness of the finish paint, the finish paint is difficult to dry or never dry, and if the hardener is more than the hardness of the finish paint, the finish paint is dried too fast and is easy to wrinkle and bubble.

The acrylic acid leveling agent can be accumulated on the surface of the finish paint to form a new resin film layer, so that the surface tension of the finish paint tends to be balanced, but the surface tension cannot be reduced, and the flow of the finish paint is not influenced. The acrylic leveling agent has good compatibility, is dissolved in the finish paint, cannot form a sexual interface on the surface of the finish paint, and cannot provide a leveling effect; the compatibility is too poor, the paint cannot be uniformly distributed on the surface of the finish paint, the paint can be mutually gathered, the defect of shrinkage cavity is easily generated, the gloss of the finish paint is reduced, and the undesirable side effects such as fog shadow and the like are caused. Only with ideal controlled compatibility, a interfacial layer with good leveling effect can be formed on the surface of the finish paint.

When the solvent of the finish paint is volatilized, the surface of the finish paint is shrunk, the particles of the extinction powder form a layer of concave-convex surface which is not easy to be perceived by naked eyes on the surface of the finish paint, the irradiated light is scattered, the glossiness of the finish paint is gradually reduced, and the finish paint is not dazzled, so that the light of the interior decorative wall and the furniture woodware is soft.

The acrylic acid defoaming agent can eliminate fine foams generated in the drying process of the finish paint, avoid the phenomenon that the bubbles are remained in the finish paint for a long time due to too fast film forming of the finish paint, and improve the spraying effect of the finish paint.

The PTFE wax improves the demolding performance, surface abrasion resistance, lubricating property, chemical corrosion resistance, weather resistance and water resistance of the finish paint; the surface structure of the finish paint can be improved, the glossiness is improved, and the effects of good hand feeling, scratch resistance and the like are achieved.

The ultraviolet absorber is a light stabilizer, and can absorb the ultraviolet part in a fluorescent light source without changing itself. The ultraviolet absorber has good thermal stability, can not be changed by heat even in processing, and has small thermal volatility; the chemical stability is good, and adverse reaction with material components in the product is avoided; the compatibility is good, and the paint can be uniformly dispersed in finish paint, and does not spray frost and exude; has the advantages of no color, no toxicity, no odor, low cost and easy acquisition.

The metal scratch resistant auxiliary agent can improve the surface hardness and scratch resistance of the finish paint, improve the leveling effect of the finish paint and increase the smooth hand feeling; obviously improves the construction quality, removes dust from inside and outside and has good compatibility.

The acrylic acid dispersing agent has good dispersibility, strong universality, high dispersing efficiency, small using amount and high cost performance, can reduce the viscosity during grinding, can improve the transparency, the covering power, the color development and the luster, and can improve the fluidity of a finish paint system.

In conclusion, the auxiliary agents are adopted to exert different effects, so that the comprehensive performance of the finish paint is improved.

Preferably, the pigment filler is titanium dioxide or iron oxide toner.

By adopting the technical scheme, the pigment and filler can enable the finish paint to present different colors and endow the coating film with covering power; meanwhile, the paint has certain promotion effects on the rheological property, the protective property, the weather resistance, the chemical resistance, the heat resistance and the mechanical property of a coating film of the finish paint.

Titanium dioxide has good whiteness, good grinding wettability, good weather resistance, good chemical stability, small granularity, high covering power and decoloring power, and good opacity and glossiness.

The iron oxide toner can resist strong sunlight exposure, is not influenced by atmosphere, is difficult to corrode by dirty gas (such as hydrogen sulfide), has good alkali resistance, good rust resistance and good corrosion resistance, has the functions of decoration and identification, and has strong covering power and tinting strength.

In a second aspect, the application provides a preparation method of an antistatic polyester finish paint, which adopts the following technical scheme:

a preparation method of antistatic polyester finish paint comprises the following steps:

except the pigment, the filler and the composite conductive agent, taking other raw materials in corresponding weight parts, mixing and grinding the raw materials until the fineness is less than 10 mu m to obtain a mixture;

and (3) uniformly dispersing the pigment and filler in corresponding parts by weight in the mixture, and then adding the composite conductive agent and uniformly mixing.

Through the technical scheme, the preparation method of the antistatic polyester finish paint is simple, reasonable in process and applicable to industrial production; meanwhile, the prepared antistatic polyester finish paint has excellent antistatic property.

In summary, the present application has the following beneficial effects:

1. according to the method, the polyester resin and the melamine formaldehyde resin are crosslinked to obtain the net-shaped structure coating, and meanwhile, the composite conductive agent is a mixture formed by graphene or a graphene compound with conductive titanium dioxide adsorbed on the surface and an organic binder, so that the dispersibility and the antistatic property of the composite conductive agent in a finish paint system are improved, and the finish paint has good antistatic property;

2. in the application, the polyester resin is preferably selected as the organic binder, so that the binding property of the composite conductive agent and the polyester resin is improved, and the binding property of the graphene or graphene compound and the conductive titanium dioxide is also improved, so that the mixing uniformity of a finish paint system is improved, and the antistatic property of the polyester finish paint is improved;

3. the graphene composite is a composite of graphene and carbon nanotubes or conductive carbon black, and the structures or components of the carbon nanotubes or the conductive carbon black and the graphene are close, so that the obtained graphene composite is good in combination effect, and the conductivity of the graphene composite is improved.

Detailed Description

The present application is described in further detail below with reference to preparation examples and examples.

Preparation example

Preparation example 1

The preparation example discloses a preparation method of a composite conductive agent, which comprises the following steps:

s10, 1g of graphene and 2g of conductive titanium dioxide are produced in ethanol for 1 hour, and the graphene powder with the conductive titanium dioxide adsorbed on the surface is obtained after uniform mixing and drying; wherein the average particle diameter of graphene is less than or equal to 20 μm, the thickness of graphene is 1-30 layers, and the conductivity is not less than 10 ⁵ S/m; the conductive titanium dioxide is CQ-907 in type, and the particle size is as follows: 50-100nm, available from Dongguan dragon Innovative materials technology Co., ltd;

s20, stirring 2g of the graphene powder with the surface adsorbed with the conductive titanium dioxide, 1g of liquid polyester resin and 10ml of absolute ethyl alcohol in vacuum for 3 hours until the slurry is uniform, and grinding for 5 hours to obtain the composite conductive agent, wherein the liquid polyester resin is purchased from Jiangsu Runfeng synthetic technology Co.

Preparation example 2

The preparation example discloses a preparation method of a composite conductive agent, which comprises the following steps:

s10, generating 2g of graphene and 2g of conductive titanium dioxide in ethanol for 1 hour, uniformly mixing, and drying to obtain graphene powder with the surface adsorbed with the conductive titanium dioxide;

s20, stirring 2g of the graphene powder with the surface adsorbed with the conductive titanium dioxide, 3g of liquid polyester resin and 10ml of absolute ethyl alcohol in vacuum for 3 hours until the slurry is uniform, and grinding for 5 hours to obtain the composite conductive agent.

Preparation example 3

The preparation example discloses a preparation method of a composite conductive agent, which comprises the following steps:

s10, generating 3g of graphene and 2g of conductive titanium dioxide in ethanol for 1 hour, uniformly mixing, and drying to obtain graphene powder with the surface adsorbed with the conductive titanium dioxide;

s20, stirring 2g of the graphene powder with the surface adsorbed with the conductive titanium dioxide, 5g of liquid polyester resin and 10ml of absolute ethyl alcohol in vacuum for 3 hours until the slurry is uniform, and grinding for 5 hours to obtain the composite conductive agent.

Preparation example 4

The preparation example discloses a preparation method of a composite conductive agent, which comprises the following steps:

s10, mixing 1g of octadecylamine and 0.5L of absolute ethyl alcohol, stirring for 30min at 80 ℃ and 500rpm/min, adding 9g of graphene and 1g of carbon nano tubes, stirring at 2000rpm/min for reaction for 1h at 80 ℃, washing, filtering and drying after stirring to obtain a graphene compound; octadecylamine, CAS No.: 124-30-1, in other embodiments octadecylamine may also be replaced with sodium dodecylbenzene sulfonate or oleic acid; carbon nanotubes, CAS No.: 308068-56-6;

s20, generating 2g of the graphene compound and 2g of conductive titanium dioxide in ethanol for 1 hour, uniformly mixing, and drying to obtain graphene powder with the surface adsorbed with the conductive titanium dioxide;

s30, stirring 2g of the graphene powder with the surface adsorbed with the conductive titanium dioxide, 3g of liquid polyester resin and 10g of absolute ethyl alcohol in vacuum for 3 hours until the slurry is uniform, and grinding for 5 hours to obtain the composite conductive agent.

Preparation example 5

The preparation example discloses a preparation method of a composite conductive agent, which comprises the following steps:

s10, mixing 4g of octadecylamine and 1L of absolute ethyl alcohol, stirring for 30min at 80 ℃ and 500rpm/min, adding 10g of graphene, 5g of carbon nano tubes and 5g of conductive carbon black, stirring at 2000rpm/min for reaction for 1h at 80 ℃, washing, filtering and drying to obtain a graphene compound; conductive carbon black, type: VULCAN XC-72, CAS number: 1333-86-4;

s20, generating 2g of the graphene compound and 2g of conductive titanium dioxide in ethanol for 1 hour, uniformly mixing, and drying to obtain graphene powder with the surface adsorbed with the conductive titanium dioxide;

s30, stirring 2g of the graphene powder with the surface adsorbed with the conductive titanium dioxide, 3g of liquid polyester resin and 10g of absolute ethyl alcohol in vacuum for 3 hours until the slurry is uniform, and grinding for 5 hours to obtain the composite conductive agent.

Examples

Examples 1 to 13

As shown in Table 1, the main difference between examples 1-13 is the different ratios of the raw materials of the antistatic polyester topcoat.

The following description will be given by taking example 1 as an example. The embodiment of the application discloses an antistatic polyester finish paint which is prepared from 41Kg of polyester resin, 5Kg of melamine formaldehyde resin, 8Kg of composite conductive agent, 14Kg of solvent (0.5 Kg of N-methyl pyrrolidone, 4Kg of dibasic ester DBE, 4Kg of ether alcohol ester PMA, 100 Kg of Mobil aromatic hydrocarbon solvent oil S and 1.5Kg of isobutyl alcohol IBA), 20Kg of titanium dioxide and 8.3Kg of auxiliary agent (0.1 Kg of anti-settling agent, 0.5Kg of p-toluenesulfonate catalyst, 2Kg of hardener, 1Kg of acrylic acid leveling agent, 1Kg of matting powder, 0.2Kg of acrylic acid defoaming agent, 1Kg of PTFE wax, 0.5Kg of ultraviolet absorbent, 1.5Kg of anti-metal scratch auxiliary agent and 0.5Kg of acrylic acid dispersing agent). Wherein the composite conductive agent is obtained in preparation example 1, the solid content of the polyester resin is 55 +/-2%, the viscosity is R-V, the acidity is more than or equal to 8, the OH value is 40-85%, and the composite conductive agent is purchased from Ribeneming chemical Co., ltd, jiangyin; melamine formaldehyde resin type: MR603LF; n-methylpyrrolidone, CAS No.: 872-50-4; the dibasic ester DBE was purchased from jonan guotong chemical ltd; ether alcohol ester PMA, CAS number: 108-65-6; mobil aromatic solvent oil S100, brand: exxon Mobil; isobutanol IBA, CAS number: 78-83-1; titanium dioxide was purchased from hebei lanqin new materials science and technology ltd; the anti-settling agent is bentonite with apparent viscosity of 65 (mPa.s) and is purchased from Xingshu mineral processing factories in Lingshou county; p-toluenesulfonate catalyst CAS:12068-03-0; the hardener was purchased from Cangzhou Limboo chemical Co., ltd; acrylic acid leveling agent, type: ECO-3378 available from wang new materials, inc; the matting powder is 2500 meshes and is purchased from science and technology limited company in Shijiazhuang bamboo; the acrylic acid defoaming agent is purchased from Defeng defoaming agent Co., ltd, dongguan city; PTFE wax was purchased from shenyang limited technologies; ultraviolet absorber, CAS No.: 3864-99-1; the metal scratch resistant additive has the following model: YF-026, available from Yongfeng chemical Co., ltd, guangdong; acrylic dispersant, CAS No.: 7446-81-3, available from Nantong Runfeng petrochemical Co.

The embodiment of the application also discloses a preparation method of the antistatic polyester finish paint, which comprises the following steps: the method comprises the following steps:

s1, putting polyester resin, melamine formaldehyde resin, a solvent and an auxiliary agent into a stirrer, uniformly stirring, moving into a grinding machine, grinding at the temperature of 45 ℃ until the average particle size is 5 microns, and obtaining a mixture;

and S2, transferring the mixture into a dispersion machine, adding titanium dioxide, dispersing at a high speed of 2500rpm for 10min, adding a composite conductive agent, and uniformly mixing to obtain the antibacterial weather-resistant polyester finish paint.

TABLE 1 EXAMPLES 1-11 raw material proportions of antistatic polyester finish paint

Examples 12 to 15

This example is different from example 1 in that the composite conductive agent obtained in preparation examples 2 to 5 was used, as shown in table 2.

TABLE 2 preparation examples of composite type conductive agents used in examples 12 to 15

Example 16

The difference between this embodiment and embodiment 8 is that titanium dioxide is replaced by iron oxide toner, and the iron oxide toner is selected from iron oxide green 5605, which is purchased from yokoku pigment co.

Comparative example

Comparative example 1

The comparative example is different from example 5 in that the composite type conductive agent is added in an amount of 0Kg.

Comparative example 2

This comparative example is different from example 5 in that the amount of the composite type conductive agent added was 15Kg.

Comparative example 3

The comparative example is different from example 5 in that the composite conductive agent is replaced by conductive titanium dioxide.

Comparative example 4

The difference between the comparative example and the example 5 is that 4.5Kg of conductive titanium dioxide and 4.5Kg of graphene are replaced with the composite conductive agent.

Performance test

Coating a polyurethane primer (Jining Weishibao chemical technology Co., ltd.) on the surface of a steel plate with the specification size of 5 multiplied by 2cm, and then baking at a high temperature, wherein the temperature of a PMT plate reaches 224 ℃, and the baking time is 45S; and (3) cooling by water after air cooling, air-drying to remove moisture, coating the finish on a steel plate coated with the primer, baking at a high temperature until the temperature of the PMT plate reaches 232 ℃ for 45S, cooling by water after air cooling, and air-drying to remove moisture to form the test plate.

Test boards formed from the topcoats obtained in examples 1 to 16 were used as test samples 1 to 16, and test boards formed from the topcoats obtained in comparative examples 1 to 4 were used as control samples 1 to 4. And (3) detecting the antistatic performance of the test sample and the control sample, wherein the specific test method refers to GB/T31838.3-2019, and the surface resistance and the surface resistivity of the test sample and the control sample are respectively tested, so that the antistatic performance of the test sample and the control sample is represented, and the results are shown in Table 3.

TABLE 3 Performance test data sheet

Referring to Table 3, in combination with examples 1 to 3, it can be seen that varying the content of the polyester resin within the appropriate range, the resulting polyester topcoats all had good antistatic properties. Because the polyester resin has good compatibility with other components, the weather resistance and the aging resistance are good, the cost is low, the curing shrinkage rate is low, and meanwhile, after the composite conductive agent is added into the finish paint, the finish paint has good aging resistance and antistatic property.

Referring to table 3, in combination with examples 2, 4 and 5, it can be seen that by varying the content of the melamine formaldehyde resin within a suitable range, the samples obtained all had good antistatic properties; meanwhile, the melamine formaldehyde resin is added into the finish paint as an amino resin curing agent, so that the crosslinking reaction between the melamine formaldehyde resin and the polyester resin can be accelerated, and the obtained finish paint has the characteristics of firmness and durability.

Referring to table 3, in combination with examples 4, 6 and 7 and comparative examples 1 and 2, it can be seen that the antistatic effect of the sample becomes better and better as the content of the composite conductive agent in the finish paint is continuously increased; however, when the amount added was large (comparative example 2), the antistatic property in the test tended to be stable. The composite conductive agent adopts the graphene surface to adsorb the conductive titanium dioxide to form powder, and then is mixed with the polyester resin, so that the polyester resin not only further improves the binding property of the graphene and the conductive titanium dioxide, but also improves the compatibility of the powder and the polyester resin in the finish paint, and the antistatic effect of the finish paint is improved.

Referring to table 3, in combination with examples 6, 8, 9 and 16, it can be seen that the highly weatherable polyester topcoat prepared by changing the content of titanium dioxide in the topcoat or equivalently replacing it with iron oxide toner within a suitable range has good antistatic properties.

Referring to table 3, in combination with examples 8 and 10, it can be seen that the antistatic property of the samples prepared by varying the contents of the respective components in the solvent within appropriate ranges is all good.

Referring to Table 3, in combination with examples 8 and 11, it can be seen that samples all had good antistatic properties by varying the contents of the respective components in the auxiliary within appropriate ranges.

Referring to table 3, in combination with examples 1 and 12-15, it can be seen that the composite conductive agent prepared by changing the mass ratio of the graphene to the conductive titanium dioxide and the mass ratio of the modifier, the graphene and other carbon materials in the preparation of the composite conductive agent in a proper range has good conductivity; meanwhile, when the mass ratio of the graphene to the conductive titanium dioxide is 1.

Referring to table 3, in combination with example 5 and comparative examples 3 and 4, it can be seen that when the composite conductive agent is replaced by equal amount of conductive titanium dioxide or a mixture of conductive titanium dioxide and graphene (comparative example 4), the antistatic property of the finish paint formed by the composite conductive agent is not the same as that of the finish paint formed by the composite conductive agent of the present application. The reason is that the graphene is adsorbed on the conductive titanium dioxide, and the graphene and the conductive titanium dioxide are effectively connected through the polyester resin, so that the graphene and the conductive titanium dioxide are better in combination, and the compounding effect of the graphene and the conductive titanium dioxide is improved; the data of example 5 is better than that of comparative example 4; meanwhile, when the conductive titanium dioxide is singly used as the antistatic agent (comparative example 3), the effect is single, and the bonding property with other components in the finish paint is poor, so that the antistatic property of the finish paint is reduced.

The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. An antistatic polyester finish paint is characterized in that: the feed is prepared from the following raw materials in parts by weight: 41-45 parts of polyester resin, 5-7 parts of melamine formaldehyde resin, 14-22 parts of solvent, 8-10 parts of composite conductive agent, 20-24 parts of pigment and filler and 8.3-16.5 parts of auxiliary agent; the composite conductive agent is graphene with conductive titanium dioxide adsorbed on the surface or a mixture of a graphene compound and an organic binder.

2. The antistatic polyester topcoat of claim 1, wherein: the graphene composite is a composite material of graphene and other carbon materials, and the other carbon materials are one or two of carbon nanotubes and conductive carbon black.

3. The antistatic polyester topcoat of claim 2, wherein: the preparation method of the graphene composite comprises the following steps: mixing a modifier and a solvent to form a mixed solution, and adding graphene and other carbon materials into the mixed solution for mixing; the mass ratio of the modifier to the graphene to other carbon materials is (1-4): (9-10): (1-10).

4. The antistatic polyester topcoat of claim 3, wherein: the modifier is one or more of octadecylamine, sodium dodecyl benzene sulfonate and oleic acid.

5. The antistatic polyester topcoat of claim 1, wherein: the organic binder is one or more of phenolic resin, epoxy resin, acrylic resin, organic silicon resin, fluorocarbon resin, vinyl chloride-vinyl acetate resin, polyester resin, vinyl resin, polyurethane resin, alkyd resin, aldehyde ketone resin, polyketone resin, nitrocellulose resin, ethyl cellulose, rosin, amber and shellac.

6. The antistatic polyester topcoat of claim 1, wherein: the preparation method of the composite conductive agent comprises the following steps: mixing the following components in percentage by mass (1-3): 2, mixing the graphene or the graphene composite with the conductive titanium dioxide to form graphene and graphene composite powder with the conductive titanium dioxide adsorbed on the surface; and (2) mixing the following components in percentage by mass: and (1-5) uniformly mixing the graphene or graphene compound powder with the surface adsorbed with the conductive titanium dioxide with a solvent and an organic binder.

7. The antistatic polyester topcoat of claim 1, wherein: the solvent comprises the following raw materials in parts by weight: 0.5-1.5 parts of N-methyl pyrrolidone, 4-6 parts of dibasic ester DBE, 4-6 parts of ether alcohol ester, 4-6 parts of Mobil aromatic hydrocarbon solvent oil and 1.5-2.5 parts of isobutanol.

8. The antistatic polyester topcoat of claim 1, wherein: the auxiliary agent comprises the following raw materials in parts by weight: 0.1-0.4 part of anti-settling agent, 0.5-0.7 part of p-toluenesulfonate catalyst, 2-3 parts of hardening agent, 1-1.5 parts of acrylic acid leveling agent, 1-3 parts of flatting powder, 0.2-0.4 part of acrylic acid defoaming agent, 1-3 parts of PTFE wax, 0.5-1 part of ultraviolet absorbent, 1.5-2.5 parts of metal scratch resistant auxiliary agent and 0.5-1 part of acrylic acid dispersing agent.

9. The antistatic polyester topcoat of claim 1, wherein: the pigment filler is titanium dioxide or ferric oxide toner.

10. A process for the preparation of an antistatic polyester top-coat according to any of claims 1 to 9, characterized in that: the method comprises the following steps:

except the pigment, the filler and the composite conductive agent, taking other raw materials in corresponding weight parts, mixing and grinding the raw materials until the fineness is less than 10 mu m to obtain a mixture;

and (3) uniformly dispersing the pigment and filler in corresponding parts by weight in the mixture, and then adding the composite conductive agent and uniformly mixing.