WO2017201770A1

WO2017201770A1 - Graphene heavy-duty anti-corrosion environmentally friendly hard repair coating and preparation method therefor

Info

Publication number: WO2017201770A1
Application number: PCT/CN2016/085259
Authority: WO
Inventors: 赖晓明; 邵聪; 王金娥; 张航; 郑华伟; 孙志伟; 张晓辉; 谭海丰
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-08-28
Filing date: 2016-06-08
Publication date: 2017-11-30
Also published as: CN106479334A; WO2017036085A2

Abstract

Provided are a graphene heavy-duty anti-corrosion environmentally friendly hard repair coating and a preparation method therefor. The coating is composed of a first component and a second component; wherein the first component comprises a polyaspartic acid ester resin, an N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethyl sulfonyl)imine salt and graphene powders; and the second component is an HDI trimer curing agent; the mass ratio of the first component and the second component is 3-4 : 1. The first component further comprises an anti-rust pigment, a colouring pigment, molecular sieve activation powders, organic digestion powders, a rheological aid and other aids.

Description

Graphene heavy anti-corrosion environmental protection hard repair coating and preparation method thereof

Technical field

The invention relates to a graphene heavy anti-corrosion coating, in particular to a graphene heavy anti-corrosion environmental protection hard repair coating and a preparation method thereof, and belongs to the field of organic coatings.

Background technique

Heavy-duty anti-corrosion coatings on the surface of outdoor metal substrates are usually repaired with paints. Primers and primers are usually used for repairing paints. Primers are usually solvent-based epoxy coatings. Topcoats are generally aliphatic acrylic polyurethane coatings. Primer is guaranteed. The adhesion and corrosion resistance of the metal substrate, the topcoat provides appearance and weather resistance, but the substrate needs to be strictly treated during the repair, the primer is applied first, the topcoat is applied after the surface is dried, and the repair cycle is long, generally requires at least 2 Sub-coating, with at least tens of minutes of primer drying time in the middle, is not suitable for the quickness of field repair; and it is a dangerous chemical, which is difficult to transport and costly in the international scope.

Although water-based paints are more environmentally friendly, existing water-based paints generally require higher environmental humidity on the surface of metal substrates, environmental relative humidity requirements of not more than 80%, and inability to dry or film normally in environments below 10 ° C or It takes several hours to completely dry, and the water-resistant paint has poor water resistance, damp heat resistance and salt spray resistance, which seriously affects the promotion and use of water-based repair paint in the field of heavy-duty anti-corrosion of outdoor equipment.

In recent years, polyurea elastic coatings have developed rapidly in the fields of anti-corrosion, wear-resisting, waterproof, etc., and have been widely used. Although they have superior performance, there are many problems in the field as repair coatings, such as too fast reaction time. Only a few seconds to a dozen seconds, the wettability to the metal substrate is not good, the adhesion is very poor, and special spraying equipment is needed. For small areas or irregular surfaces that need to be manually brushed, it is impossible to construct, even if it is The polyaspartic acid ester polyurea elastic coating called the third generation polyurea has excellent adhesion to the metal substrate and in-situ coating of the outdoor equipment of galvanized steel sheet. Poor, need to be used with the primer, due to the presence of zinc oxide and zinc hydroxide in the galvanized sheet, the adhesion of the conventional polyaspartic acid polyurea coating is extremely poor, and the repairing effect of the outdoor equipment of the galvanized steel sheet cannot be guaranteed.

The unique properties of graphene demonstrate its enormous potential in the field of corrosion protection of metallic materials. First, the stable sp2 hybrid structure of graphene makes it possible to form a physical barrier between the metal and the active medium to prevent diffusion and penetration. Secondly, graphene has good thermal and chemical stability, both at high temperatures. Under conditions (up to 1500 ° C), it can remain stable in corrosive or oxidizing gases and liquids. In addition, the good electrical and thermal conductivity of graphene provides favorable conditions for the service environment of metals in corrosive environments. Therefore, the repair coating prepared by using the graphene composite material can greatly improve the corrosion resistance of the coating.

Summary of the invention

The embodiment of the present invention provides a graphene heavy-duty anti-corrosion environmental protection hard repair coating which is convenient for repairing and corrosion of a metal substrate surface coating in a field repairing device, and a preparation method thereof. The graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating does not contain organic volatile solvents, almost odorless, non-hazardous chemicals, to achieve a combination of primer and topcoat, no need to apply primer, excellent anti-corrosion and weather resistance, pencil hardness Up to 3H, excellent adhesion and impact resistance, normal construction above -10 °C, rapid drying, easy construction; not only strong adhesion to galvanized steel substrate, but also suitable for cold-rolled steel, aluminum alloy, magnesium alloy, etc. Single-layer heavy-duty anti-corrosive hard repair coating for metal substrate repair.

In order to achieve the above object, an embodiment of the present invention provides a graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating, wherein the first component and the second component are:

The first component comprises: polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and graphene powder;

The second component is an HDI trimer curing agent;

Wherein the mass ratio of the first component to the second component is 3-4:1.

In the above scheme, the polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine double (three The mass ratio of the fluoromethylsulfonyl)imide salt and the graphene powder is 45-55: 2-4: 0.2-1.

In the above solution, the first component further comprises: an anti-rust pigment, a coloring pigment, a molecular sieve activated powder, an organic digestive powder, a rheological additive and other auxiliary agents.

In the above solution, the mass ratio of the anti-rust pigment, the coloring pigment, the molecular sieve activated powder, the organic digestive powder, the rheological additive and other auxiliary agents is 10-20:3-15:2-5:0-15: 0.2-0.6: 0.4-0.8.

In the above solution, the graphene powder is a graphene sheet powder composed of a plurality of layers of single-layer graphene, and the graphene powder of the embodiment of the invention is uniformly dispersed in the base resin and other additives, and can be improved. Repair the environmental stability and comprehensive corrosion resistance of the coating.

In the above aspect, the number of layers of the graphene sheet powder is 1-10 layers.

In the above solution, the graphene powder is activated by an ethanol solution of a surfactant before use, and is used to prepare the graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating.

In the above embodiment, the mass fraction of the surfactant ethanol solution for treating the graphene powder is 1%.

In the above solution, the surfactant is one or more of sodium alkylbenzenesulfonate, sodium polyacrylate, sodium alginate and sodium stearate, used for surface modification of graphene, changing graphene Surface energy, increasing its dispersion properties.

In the above solution, the anti-rust pigment is zinc phosphate and/or modified aluminum tripolyphosphate, and the anti-rust pigment can not only improve the adhesion of the repair coating to the galvanized steel sheet, but also increase the comprehensive anti-corrosion ability of the repair coating.

In the above solution, the coloring pigment is a high weathering inorganic pigment or organic pigment, including but not limited to: rutile titanium dioxide, high pigment carbon black, iron oxide red, iron oxide yellow, chrome yellow, phthalocyanine blue, lanthanum Cyanine green, permanent red, permanent yellow, permanent solid purple, etc., used to obtain the appearance color required for repair.

In the above solution, the molecular sieve activated powder is one or more of 3A, 4A, 5A molecular sieve activated powder, and the addition of the molecular sieve activated powder can remove the moisture in the coating system and improve the coating quality. Avoid foaming and save curing time.

In the above solution, the organic digestive powder is a modified urea polymer powder, and the addition of the organic digestive powder can reduce the gloss and make the coating closer to the standard template.

In the above solution, the rheology aid is an organosilicone modified fumed silica, which has the functions of anti-precipitation and discharge.

In the above scheme, the other auxiliary agent includes a dispersing agent, an antifoaming agent and a leveling agent.

In the above scheme, the mass ratio of the dispersant, the antifoaming agent and the leveling agent is 1:1:1.

In the above solution, the dispersing agent, the main chemical component is a prepolymer of a long-chain polycarboxylic acid and a polyhydric alcohol, and functions to improve the dispersibility and stability of the pigment.

In the above solution, the antifoaming agent component is a modified polydimethylsiloxane, which functions to eliminate bubbles in the production process of the coating.

In the above solution, the leveling agent is a polyether modified polydimethylsiloxane, which functions to reduce the surface tension of the coating, avoid shrinkage, and improve the flatness of the coating.

In the above embodiment, the polyaspartic acid ester resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, graphene powder, rust preventive pigment, coloring pigment The mass percentage of molecular sieve activated powder, organic digestive powder, rheological assistant and other auxiliary agents is: polyaspartic acid ester resin 45-55%; N-carboxymethyl-N-methylpyrrolidine bis (trifluoro Methylsulfonyl)imide salt 2-4%; graphene powder 0.2-1%; antirust pigment 10-20%; coloring pigment 3-15%; molecular sieve activated powder 2-5%; organic digestive powder 0- 15%; rheological additive 0.2-0.6%; other additives 0.4-0.8%.

In the above formula, the polyaspartic acid ester resin and the HDI trimer curing agent are film-forming substances of the repair coating, and the two can be crosslinked at room temperature to form a coating film having excellent toughness and weather resistance, N-carboxymethyl-N. -Methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt is a multifunctional additive that has a toughening effect and also dissolves metal oxides on the surface of the steel to improve the adhesion of the coating to the metal substrate.

Another aspect of the present invention provides a method for preparing a graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating, comprising:

The first group is prepared by mixing and stirring a raw material containing polyaspartic acid ester resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and graphene powder. Minute;

An HDI trimer curing agent as a second component is added to the first component, and the mixture is uniformly stirred.

Wherein the mass ratio of the first component to the second component is 3-4:1.

In the above embodiment, the raw material comprising the polyaspartic acid ester resin, the N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and the graphene powder is mixed and stirred. Processing, preparing the first component comprises:

The graphene powder is added to the surfactant ethanol solution, stirred and sonicated, filtered and dried to obtain an activated graphene powder;

Stirring the activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt and other auxiliaries, Preparing a preliminary material of the graphene liquid raw material mixture;

The coloring pigment, the rust preventive pigment, the molecular sieve activated powder, the organic digestive powder and the rheological assistant are added to the preliminary material of the graphene liquid raw material mixture, stirred and uniformly mixed to obtain a first component.

In the above scheme, the surfactant ethanol solution has a mass fraction of 1%.

In the above embodiment, the ratio of the weight of the graphene powder to the volume of the surfactant ethanol solution is 1-2 g: 50-100 ml.

In the above embodiment, the stirring time of the graphene powder and the surfactant ethanol solution is 20-30 min, and the stirring speed is 200-600 r/min.

In the above scheme, the treatment time for sonicating the graphene powder and the surfactant is 20-30 min.

In the above scheme, the stirring time of the preliminary material of the graphene liquid raw material mixture is 20-30 min, and the stirring speed is 800-1500 r/min.

In the above solution, the coloring pigment, the rust preventive pigment and the molecular sieve activated powder are first added to the preliminary material of the graphene liquid raw material mixture, stirred for 20-30 min and ground to uniformly disperse, and then the organic digestive powder is further dispersed. The rheological additive is added thereto, stirred at a stirring speed of 800 to 1500 r/min for 20 to 30 minutes, and uniformly mixed to prepare the first component.

The HDI trimer curing agent is added to the first component which has been uniformly mixed, and the mixture is uniformly stirred to obtain a graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating.

In the above solution, the coloring pigment is a high weathering inorganic pigment or organic pigment, including but not limited to: rutile titanium dioxide, high pigment carbon black, iron oxide red, iron oxide yellow, chrome yellow, phthalocyanine blue, lanthanum Cyanine green, permanent red, permanent yellow, permanent solid purple, etc., used to obtain the appearance required for repair colour.

In the above solution, the molecular sieve activated powder is one or more of 3A, 4A, 5A molecular sieve activated powder, and the addition of the molecular sieve activated powder can remove moisture in the coating system, improve coating quality, avoid foaming, and save curing time. .

The polyaspartate and HDI trimer curing agent in the above formula are film-forming materials for refinishing coatings, which can be crosslinked at room temperature to form a coating film with excellent toughness and weather resistance, N-carboxymethyl-N- Methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt is a multifunctional additive that has a toughening effect and also dissolves metal oxides on the surface of the steel to improve the adhesion of the coating to the metal substrate.

The advantages and beneficial technical effects of the embodiments of the present invention are as follows:

The graphene heavy-duty anti-corrosion environmentally-friendly hard repairing coating of the embodiment of the invention does not contain organic volatile solvent, is almost odorless, and is non-hazardous chemical, and is very suitable for repairing rusted parts or damaged coatings of outdoor equipment.

detailed description

The present invention is further described below by way of specific embodiments:

Raw materials and reagents: The polyaspartic acid ester resin used in the examples of the present invention is one or a mixture of Bayer Desmophen 1420, Desmophen 1520, Desmophen 1220, Zhuhai Feiyang Chemical F420, F520, F530, F220; molecular sieve activated powder It is 3A, 4A, 5A molecular sieve activated powder; organic digestive powder is Shengyuan Chemical E-7; rheological additive is fumed silica Cabot TS-720; dispersing agent is BYK108 of German BYK; defoaming agent is Degao Company TEGO N; leveling agent is Shanghai Tyco Polymer Company TECH-284; HDI trimer curing agent is Bayer Desmodur N3600.

Example 1

Prepare a graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating (light gray) and test its coating results:

1. Prepare according to the following quality ratio:

Polyaspartate resin 50% (Desmophen 1420 25%, Desmophen 152025%); N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt 3%; graphene powder Body 0.8%; zinc phosphate 16%; rutile titanium dioxide 13%; molecular sieve activated powder 3.5%; organic matting powder 12.8%; fumed silica 0.3%; dispersant 0.2%; defoamer 0.2%; leveling agent 0.2 %.

2. The graphene powder is added to a sodium benzene sulfonate ethanol solution having a mass fraction of 1%, wherein the ratio of the weight of the graphene powder to the volume of the 1% sodium alkylbenzene sulfonate solution is 1.5. g: 60 ml, stirred at a stirring speed of 300 r / min for 25 min, and sonicated for 25 min, to obtain activated graphene powder;

Activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, dispersant, antifoaming agent and flow The mixture is mixed and stirred at a stirring speed of 1200 r/min for 25 minutes to prepare a preliminary material of the graphene liquid raw material mixture;

Add rutile titanium dioxide, zinc phosphate and molecular sieve activated powder to graphene liquid raw material The mixture was stirred for 25 minutes, ground and homogenized, and then the organic digested powder and fumed silica were added thereto, stirred at a stirring speed of 1000 r/min for 25 minutes, and uniformly mixed to obtain a first component. .

3. Adding the HDI trimer curing agent to the first component which has been uniformly mixed, and stirring and mixing uniformly, the graphene heavy anti-corrosion and environmentally-friendly hard repair coating can be obtained, wherein the first component and the second component are obtained. The mass ratio is 3.3:1.

The prepared graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating was manually brushed on the surface of the hot-dip galvanized steel sheet, and the thickness of the coating was 200-380 μm after manual brushing. The test results were as follows:

Table 1 The graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating prepared in Example 1 was manually brushed on the surface of the hot-dip galvanized steel sheet.

Example 2

1. Prepare according to the following quality ratio:

Polyaspartate resin 53% (F530 27%, Desmophen 1520 26%); N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt 2.5%; graphene powder Body 0.5%; zinc phosphate 10%; rutile titanium dioxide 14.75%; molecular sieve activated powder 4%; organic digestive powder 14%; fumed silica 0.5%; dispersant 0.25%; defoamer 0.25%; leveling agent 0.25 %.

2. The graphene powder is added to a 1% sodium polyacrylate ethanol solution, wherein the ratio of the weight of the graphene powder to the volume of the 1% sodium polyacrylate solution is 2 g: 60 ml, stirring at 400 r/min. Stirring at a speed of 20 min, and sonicating for 20 min, to obtain activated graphene powder;

Activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, dispersant, antifoaming agent and flow The mixture is mixed and stirred at a stirring speed of 1000 r/min for 20 minutes to prepare a preliminary material of the graphene liquid raw material mixture;

The rutile type titanium dioxide, zinc phosphate and molecular sieve activated powder are first added to the starting material of the graphene liquid raw material mixture, stirred for 20 min and ground to make it evenly dispersed, and then the organic digestive powder and fumed silica are added thereto at 1200 r/ The mixture was stirred for 20 min at a stirring speed of min, and uniformly mixed to obtain a first component.

3. Adding the HDI trimer curing agent to the first component which has been uniformly mixed, and stirring and mixing uniformly, the graphene heavy anti-corrosion and environmentally-friendly hard repair coating can be obtained, wherein the first component and the second component are obtained. The mass ratio is 3.5:1.

The prepared graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating was manually brushed on the surface of the hot-dip galvanized steel sheet, and the thickness of the coating after manual brushing was 220-350 μm. The test results were as follows:

Table 2: Graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating prepared in Example 2, hand-brushing test results on the surface of hot-dip galvanized steel sheet

Example 3

Prepare a graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating (grass green) and test its brushing results:

1. Prepare according to the following quality ratio:

Polyaspartate resin 50% (Desmophen 1420 or F420); N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt 3.5%; graphene powder 0.6%; Modified aluminum tripolyphosphate 18%; rutile titanium dioxide 9.9%; phthalocyanine green 3%; molecular sieve activated powder 2%; organic digestive powder 12%; fumed silica 0.4%; dispersant 0.2%; defoamer 0.2 %; leveling agent 0.2%.

2. Add graphene powder to a mixture of 1% sodium alginate and sodium hard acid in ethanol solution, wherein the weight of the graphene powder and the volume of 1% sodium alginate and sodium hard acid in ethanol solution The ratio of 1g: 80ml, stirring at a stirring speed of 500r / min for 30min, and sonicating for 30min, to obtain activated graphene powder;

Activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, dispersant, antifoaming agent and flow The mixture is mixed and stirred at a stirring speed of 800 r/min for 30 minutes to prepare a preliminary material of the graphene liquid raw material mixture;

The rutile type titanium dioxide, zinc phosphate and molecular sieve activated powder are first added to the starting material of the graphene liquid raw material mixture, stirred for 30 min and ground to make it evenly dispersed, and then the organic digestive powder and fumed silica are added thereto at 900 r/ After stirring at a stirring speed of min for 30 min, the mixture was uniformly mixed to obtain a first component.

3. Adding the HDI trimer curing agent to the first component which has been uniformly mixed, and stirring and mixing uniformly, the graphene heavy anti-corrosion and environmentally-friendly hard repair coating can be obtained, wherein the first component and the second component are obtained. The mass ratio is 3.8:1.

The prepared graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating was hand-brushed on the surface of the hot-dip galvanized steel sheet, and the thickness of the coating after manual brushing was 200-350 μm. The test results are as follows:

Table 3: Graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating prepared in Example 3, hand-brushing test results on the surface of hot-dip galvanized steel sheet

Example 4

Prepare a graphene heavy-duty anti-corrosion and environmentally-friendly hard repair coating (light yellow ash) and test its brushing results:

1. Prepare according to the following quality ratio:

Polyaspartate resin 55% (Desmophen 1220 or F220); N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt 4%; graphene powder 1%; Modified aluminum tripolyphosphate 16.4%; rutile titanium dioxide 2%; iron oxide yellow 1%; molecular sieve activated powder 5%; organic digestive powder 15%; fumed silica 0.2%; dispersant 0.13%; defoamer 0.13 %; leveling agent 0.13%.

2. Add graphene powder to 1% sodium alginate and sodium hard acid in ethanol solution, wherein the weight of graphene powder and the ratio of 1% sodium alginate and sodium hard acid in ethanol solution 2g: 50ml, stirred at a stirring speed of 600r / min for 20min, and sonicated for 20min, to obtain activated graphene powder;

Activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, dispersant, antifoaming agent and flow The mixture is mixed and stirred at a stirring speed of 1500 r/min for 20 minutes to prepare a preliminary material of the graphene liquid raw material mixture;

The rutile type titanium dioxide, zinc phosphate and molecular sieve activated powder are first added to the starting material of the graphene liquid raw material mixture, stirred for 20 min and ground to make it evenly dispersed, and then the organic digestive powder and fumed silica are added thereto at 1500 r/ The mixture was stirred for 20 min at a stirring speed of min, and uniformly mixed to obtain a first component.

3. Add the HDI trimer curing agent to the first component which has been uniformly mixed, stir and mix evenly, and then obtain the graphene heavy anti-corrosion and environmentally-friendly hard repair coating, wherein the first component and the second component The mass ratio of the components is 4:1.

The prepared graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating was hand-brushed on the surface of the hot-dip galvanized steel sheet, and the thickness of the coating after manual brushing was 220-380 μm. The test results were as follows:

Table 4: Graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating prepared in Example 4, hand-brushing test results on the surface of hot-dip galvanized steel sheet

Example 5

Prepare a graphene heavy-duty anti-corrosion and environmentally-friendly hard repair coating (orange-red) and test its brushing results:

1. Prepare according to the following quality ratio:

Polyaspartate resin 40% (Desmophen 1520 or F520); N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt 4%; graphene powder 0.2%; Modified aluminum tripolyphosphate 20%; rutile titanium dioxide 5%; permanent solid red 5%; permanent solid yellow 5%; organic matting powder 15%; Molecular sieve activated powder 4.4%; fumed silica 0.6%; dispersant 0.27%; defoamer 0.27%; leveling agent 0.27%.

2. Add graphene powder to 1% sodium alginate and sodium hard acid in ethanol solution, wherein the weight of graphene powder and the ratio of 1% sodium alginate and sodium hard acid in ethanol solution 1 g: 100 ml, stirred at a stirring speed of 200 r / min for 30 min, and sonicated for 30 min, to obtain activated graphene powder;

Activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, dispersant, antifoaming agent and flow The mixture is mixed and stirred at a stirring speed of 900 r/min for 30 min to prepare a preliminary material of the graphene liquid raw material mixture;

The rutile titanium dioxide, zinc phosphate and molecular sieve activated powder are first added to the preliminary material of the graphene liquid raw material mixture, stirred for 30 min and ground to make it evenly dispersed, and then the organic digestive powder and fumed silica are added thereto at 800 r/ After stirring at a stirring speed of min for 30 min, the mixture was uniformly mixed to obtain a first component.

3. Adding the HDI trimer curing agent to the first component which has been uniformly mixed, and stirring and mixing uniformly, the graphene heavy anti-corrosion and environmentally-friendly hard repair coating can be obtained, wherein the first component and the second component are obtained. The quality ratio is 3:1.

Table 5: Graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating prepared in Example 5, hand-brushing test results on the surface of hot-dip galvanized steel sheet

1. The graphene heavy-duty anti-corrosion environmentally-friendly hard repairing coating of the embodiment of the invention does not contain organic volatile solvent, is almost odorless, and is non-hazardous chemical, and is very suitable for repairing rusted parts or damaged coatings of outdoor equipment.

2. The preparation method of the graphene heavy-duty anti-corrosion environmental protection hard repairing coating of the embodiment of the invention is simple and quick, and the first component and the second component can be uniformly mixed, and the curing is not required for a long time, which is very suitable for designing into a small package. Carrying and construction of common items.

3. The graphene heavy anti-corrosion environmental protection hard repair paint primer and top coat are combined into one, no need to apply primer, excellent anti-corrosion and weather resistance, pencil hardness of more than 3H, excellent adhesion and impact resistance. It can be normally constructed above -10 °C, which can repair the damaged coating or rusted area of metal directly and quickly. It can be dried quickly, and the surface is completely dry within 1h, and the performance is excellent.

4. The graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating of the embodiment of the invention can not only repair the original coating of the metal substrate such as galvanized sheet, cold-rolled steel sheet or aluminum alloy sheet, including: outdoor powder coating and amino baking coating. Layer, polyurethane coating, etc.; can also directly brush the metal substrate, adhesion to galvanized steel substrate, and excellent adhesion to cold-rolled steel, aluminum alloy, magnesium alloy and other metal substrates. ,Wide range of applications.

5, the graphene heavy anti-corrosion environmental protection hard repair coating in the embodiment of the invention is in the hot-dip galvanized steel sheet equipment The surface has excellent adhesion, water resistance, acid resistance, alkali resistance, sulfur dioxide resistance, salt spray resistance, and aging resistance to xenon lamps.

Industrial applicability

The graphene heavy anti-corrosion environmental protection hard repairing coating of the embodiment of the invention does not contain organic volatile solvent, almost odorless, non-hazardous chemicals, primer and topcoat are combined into one, no need to apply primer, and excellent anti-corrosion and weather resistance performance. Pencil hardness of more than 3H, excellent adhesion and impact resistance, normal construction above -10 °C, rapid drying, easy construction; not only strong adhesion to galvanized steel substrate, but also suitable for cold-rolled steel, aluminum alloy, magnesium A single-layer heavy-duty anti-corrosion hard repair coating repaired on a metal substrate such as an alloy.

Claims

A graphene heavy-duty anti-corrosion environmentally-friendly hard repair coating consisting of a first component and a second component:

The first component comprises: polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and graphene powder;

The second component is an HDI trimer curing agent;

Wherein the mass ratio of the first component to the second component is 3-4:1.
The coating according to claim 1, wherein said polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and graphene powder The mass ratio is 45-55: 2-4: 0.2-1.
The coating of claim 1 wherein said first component further comprises: a rust preventive pigment, a coloring pigment, a molecular sieve activated powder, an organic digestive powder, a rheological additive, and other auxiliaries.
The paint according to claim 3, wherein the ratio of the mass of the rust preventive pigment, the coloring pigment, the molecular sieve activated powder, the organic digestive powder, the rheological assistant and the other auxiliary agent is 10-20:3-15:2 -5:0-15: 0.2-0.6: 0.4-0.8.
The coating according to claim 4, wherein the polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, graphene powder The mass percentage of anti-rust pigment, coloring pigment, molecular sieve activated powder, rheological assistant and other auxiliary agents are: 45-55% of polyaspartic acid ester resin; N-carboxymethyl-N-methylpyrrolidine double (trifluoromethylsulfonyl)imide salt 2-4%; graphene powder 0.2-1%; rust preventive pigment 10-20%; coloring pigment 3-15%; molecular sieve activated powder 2-5%; organic digestion Powder 0-15%; rheological additive 0.2-0.6%; other additives 0.4-0.8%.
A preparation method of graphene heavy anti-corrosion environmental protection hard repair coating, comprising:

The first group is prepared by mixing and stirring a raw material containing polyaspartic acid ester resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and graphene powder. Minute;

An HDI trimer curing agent as a second component is added to the first component, and the mixture is uniformly stirred.
The production method according to claim 6, wherein the ratio of the mass of the first component to the second component is 3-4:1.
The production method according to claim 6, wherein said polyglutamate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, and The raw materials of the graphene powder are mixed and stirred to obtain the first component comprising:

The graphene powder is added to the ethanol solution of the surfactant, stirred and sonicated, filtered and dried to obtain the activated graphene powder;

Stirring the activated graphene powder with polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt and other auxiliaries, Preparing a preliminary material of the graphene liquid raw material mixture;

The coloring pigment, the rust preventive pigment, the molecular sieve activated powder, the organic digestive powder and the rheological assistant are added to the preliminary material of the graphene liquid raw material mixture, stirred and uniformly mixed to obtain a first component.
The production method according to claim 8, wherein the polyaspartate resin, N-carboxymethyl-N-methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt, graphene powder The mass percentage of body, rust preventive pigment, coloring pigment, molecular sieve activated powder, organic digestive powder, rheological assistant and other auxiliaries is: polyaspartate resin 45-55%; N-carboxymethyl-N- Methylpyrrolidine bis(trifluoromethylsulfonyl)imide salt 2-4%; graphene powder 0.2-1%; rust preventive pigment 10-20%; coloring pigment 3-15%; molecular sieve activated powder 2- 5%; organic digestive powder 0-15%; rheological additive 0.2-0.6%; other additives 0.4-0.8%.
The production method according to claim 8, wherein the surfactant is one or more selected from the group consisting of sodium alkylbenzenesulfonate, sodium polyacrylate, sodium alginate, and sodium stearate.