CN108559375A - Polyaspartic Polyurea anticorrosive paint containing polyaniline and preparation method thereof - Google Patents

Abstract

Polyaniline-containing polyaspartic acid ester polyurea anticorrosion coating and preparation method thereof belong to the technical field of anticorrosion coatings, the coating is composed of A component and B component, A component is composed of polyaspartic acid ester resin, It is composed of solvent, intrinsic polyaniline, pigment, functional filler, thixotropic agent, ultraviolet absorber and auxiliary agent; B component is curing agent; the preparation method includes preparing A component, weighing B component, and A component Component B and component B are packaged separately. Before use, the molar ratio of hydroxyl-OH of component A to isocyanate-NCO of component B is (1.0-1.2): 1.0 and mixed evenly to obtain the coating of the present invention. The coating has excellent weather resistance, adhesion, and chemical corrosion resistance, with a solid content of more than 90%, zero or very low VOC emissions, and the required film thickness can be obtained in one construction, which reduces the number of constructions and improves work efficiency. Efficiency, shorten the construction period, and greatly reduce the cost.

Description

Polyaniline-containing polyaspartate polyurea anticorrosion coating and preparation method thereof

technical field

The invention belongs to the technical field of anticorrosion coatings, in particular to polyaniline-containing polyaspartate polyurea anticorrosion coatings and a preparation method thereof.

Background technique

At present, the economic loss caused by corrosion of metal materials in our country is relatively serious every year, accounting for about 5% of the gross national product, causing a large number of infrastructure equipment to be scrapped, which has become the most important cause of equipment loss. my country's current corrosion loss is higher than that of developed countries, and it is generally accepted internationally that the loss caused by marine corrosion is far greater than the loss caused by natural disasters. From the perspective of the economics of anti-corrosion treatment, the use of anti-corrosion coatings is the most economical and effective method. Traditional anti-corrosion coatings are mostly solvent-based coatings, which have the disadvantages of large VOC emissions, environmental pollution, and short anti-corrosion life. Therefore, in order to meet the special anti-corrosion requirements of emerging marine engineering, modern transportation, energy industry, large chemical enterprises, and municipal facilities , there is an urgent need to develop a new type of heavy-duty anti-corrosion coating.

Traditional aromatic polyurea coatings are prone to yellowing and fading when used outdoors, the reaction speed is too fast, the gel time is short (3s~5s), the wetting ability to the substrate is weak, the adhesion is poor, and the application period is too short. A series of problems such as the use of special equipment for construction. Therefore, there is an urgent need for a new coating in the prior art to solve the above problems.

Contents of the invention

The technical problem to be solved by the present invention is: the present invention provides an environment-friendly polyaniline-containing polyaspartic ester polyurea anticorrosion coating and a preparation method thereof, combining polyaniline with incomparable incomparable properties to conventional coatings on metal materials. Anode protection and shielding can greatly improve the corrosion resistance of metal materials. It also has unique anti-scratch, anti-pitting and self-repairing anti-corrosion capabilities. It has the characteristics of high solid content, environmental friendliness, simple construction, and strong anti-corrosion ability. , can be used for weather-resistant, waterproof, anti-corrosion and anti-fouling coatings in special environments such as emerging marine engineering, modern transportation, energy industry, large chemical enterprises, and municipal facilities.

The present invention adopts following technical scheme:

The present invention proposes a polyaniline-containing polyaspartic acid ester polyurea anticorrosion coating, which is characterized in that: the coating is composed of A component and B component, and the A component is made of polyaspartic acid ester resin , solvent, intrinsic polyaniline, pigment, functional filler, thixotropic agent, ultraviolet absorber and auxiliary agent; the B component is a curing agent;

The molar ratio of the hydroxyl-OH of the A component to the isocyanate-NCO of the B component is (1.0-1.2): 1.0;

Among them, in component A, the mass ratio of polyaspartic acid ester resin, solvent, intrinsic polyaniline, pigment, functional filler, thixotropic agent, ultraviolet absorber and additive is (30-50): (4- 10): (2~5): (20~30): (25~40): (1~2): (1~3): (1~3).

The intrinsic polyaniline is intrinsic polyaniline with a molecular weight of 10,000-100,000.

The polyaspartic acid ester resin is any two of polyaspartic acid ester resin F-520, polyaspartic acid ester resin F-524 and polyaspartic acid ester resin F-420.

The solvent is propylene glycol methyl ether acetate.

The pigment is any one or both of titanium dioxide and carbon black.

The functional filler is one or more of mica powder, zinc oxide, and precipitated barium sulfate.

The thixotropic agent includes any one of organic bentonite or polyamide wax; the ultraviolet absorber is any one of ultraviolet absorber UV-0, ultraviolet absorber UV-9, and ultraviolet absorber UV-24.

The auxiliary agent is a leveling agent, a wetting and dispersing agent, and a defoamer; the leveling agent is a polyacrylate solution, and the model is any one of BYK-352, BYK-354, and BYK-358N; the The wetting and dispersing agent is a high molecular weight block copolymer solution containing pigment affinity groups, the model is any one of BYK161, BYK164, BYK9077; the defoamer is a foam-breaking polysiloxane solution, the model is BYK -Any one of A530, BYK-066N, BYK-072.

The curing agent is any one of aliphatic polyisocyanate N-3390, aliphatic polyisocyanate N-3200, and aliphatic polyisocyanate N-3600.

The present invention also proposes a method for preparing the above-mentioned polyaniline-containing polyaspartate polyurea anticorrosion coating, which is characterized in that: the method comprises the following steps:

Step 1. According to the mass ratio of polyaspartic acid ester resin, solvent, intrinsic polyaniline, pigment, functional filler, thixotropic agent, ultraviolet absorber and auxiliary agent (30-50): (4-10) : (2~5): (20~30): (25~40): (1~2): (1~3): (1~3) respectively mix polyaspartic acid ester resin, solvent, intrinsic State polyaniline, pigments, functional fillers, thixotropic agents, ultraviolet absorbers, and additives are placed in the disperser in order to disperse. The linear speed of the agitator in the disperser is above 15m/s. Grind with a mill to a fineness of ≤40um, filter and package to obtain component A; step 2, divide the curing agent into separate packages, and use it as component B; step 3, package component A and component B separately, and use it according to The molar ratio of hydroxyl-OH of component A and isocyanate group-NCO of component B is (1.0-1.2): 1.0 and mixed evenly to obtain polyaniline-containing polyaspartate polyurea anticorrosion coating.

Through the above design scheme, the present invention can bring the following beneficial effects:

1. The construction window of the polyaniline-containing polyaspartate polyurea anticorrosion coating provided by the present invention can be adjusted within the range of 30 minutes to 2 hours;

2. High solid content, which can reach more than 90%, can achieve zero VOC or extremely low VOC emissions;

3. It has excellent weather resistance, and the accelerated test of artificial aging resistance can reach more than 2000h;

4. The coating is excellent in chemical corrosion resistance. The tinplate plate coated with the coating of the present invention is respectively placed in different media for corrosion testing: 1) NaCl solution with a mass fraction of 5%; 2) sulfuric acid with a mass fraction of 20% solution; 3) 20% mass fraction of sodium hydroxide solution; after the sample was soaked in the above-mentioned medium for 1200h respectively, there was no phenomenon such as foaming, peeling, and shedding of the sample by visual inspection;

5. The intrinsic state polyaniline in the coating of the present invention has reversible oxidation-reduction properties, and has incomparable anodic protection and shielding effects on metal materials, as well as special anti-corrosion properties produced by the strong adsorption of nitrogen atoms on the chain to metals, Therefore, it has excellent anti-corrosion properties.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

1) Preparation of component A: 90g polyaspartate resin F-520, 90g polyaspartate resin F-524, 16g propylene glycol methyl ether acetate, 8g intrinsic state polyaniline, 80g titanium dioxide , 60g mica powder, 40g zinc oxide, 5g organic bentonite, 5g ultraviolet absorber UV-0, 2g defoamer BYK-066N, 2g leveling agent BYK-354 and 2.5g wetting and dispersing agent BYK161, placed in the dispersing machine in turn Internal dispersion, the linear speed of the agitator in the disperser is above 15m/s, after mixing, add glass beads as the grinding medium, use a sand mill to grind to a fineness of ≤40um, filter and pack to obtain component A;

2) Component B curing agent: weigh 100g-105g of aliphatic polyisocyanate N-3200 produced by Bayer as component B;

3) Stir the above components A and B evenly before use to obtain a polyaniline-containing polyaspartate polyurea anticorrosion coating.

Example 2

1) Preparation of component A: 60g polyaspartate resin F-520, 100g polyaspartate resin F-524, 20g propylene glycol methyl ether acetate, 8g intrinsic state polyaniline, 80g titanium dioxide , 15g carbon black, 60g precipitated barium sulfate, 40g mica powder, 5g polyamide wax, 5g ultraviolet absorber UV-9, 2g defoamer BYK-A530, 2g leveling agent BYK-352 and 2.5g wetting and dispersing agent BYK -164, placed in the disperser in order to disperse, the linear speed of the agitator in the disperser is above 15m/s, after mixing, add glass beads as the grinding medium, use a sand mill to grind to a fineness of ≤40um, filter and pack, Get A component;

2) Component B curing agent: weigh 85g~90g of aliphatic polyisocyanate N-3600 produced by Bayer Company as component B;

3) Stir the above components A and B evenly before use to obtain a polyaniline-containing polyaspartate polyurea anticorrosion coating.

Example 3

1) Preparation of component A: 60g polyaspartate resin F-520, 100g polyaspartate resin F-420, 20g propylene glycol methyl ether acetate, 10g intrinsic polyaniline, 90g titanium dioxide , 10g carbon black, 40g zinc oxide, 40g mica powder, 20g precipitated barium sulfate, 5g organic bentonite, 5g ultraviolet absorber UV-24, 2g defoamer BYK-A530, 2g leveling agent BYK-358N and 2.5g wetting Dispersant BYK9077 is placed in the disperser in turn for dispersion. The linear speed of the agitator in the disperser is above 15m/s. After mixing, add glass beads as the grinding medium, use a sand mill to grind to a fineness of ≤40um, filter and pack , get A component;

2) Component B curing agent: weigh 85g~90g of aliphatic polyisocyanate N-3200 produced by Bayer Company as component B;

3) Stir the above components A and B evenly before use to obtain a polyaniline-containing polyaspartate polyurea anticorrosion coating.

Example 4

1) Preparation of component A: 90g polyaspartate resin F-520, 90g polyaspartate resin F-420, 20g propylene glycol methyl ether acetate, 8g intrinsic state polyaniline, 80g titanium dioxide , 10g carbon black, 40g mica powder, 60g precipitated barium sulfate, 5g organic bentonite, 5g ultraviolet absorber UV-9, 2g defoamer BYK-072, 2g leveling agent BYK-354 and 2.5g wetting and dispersing agent BYK- 161 were placed in the disperser in order to disperse. The linear speed of the agitator in the disperser was above 15m/s. After mixing evenly, glass beads were added as the grinding medium, and the sand mill was used to grind to a fineness of ≤40um, filtered and packaged to obtain A components;

2) Component B curing agent: weigh 110g-120g of aliphatic polyisocyanate N-3390 produced by Bayer as component B;

3) Stir the above components A and B evenly before use to obtain a polyaniline-containing polyaspartate polyurea anticorrosion coating.

Mix the components A and B in the above-mentioned Examples 1 to 4 and each comparative example fully, and use high-pressure spraying at 20°C to prepare a film with a thickness of 150um to 180um. After curing for 7 days under the condition of humidity 50±5%, the performance test of the film layer is carried out. For details, please refer to Table 1:

Table 1

Claims (10)

1. The polyaspartic ester polyurea anticorrosion coating that contains polyaniline is characterized in that: this coating is made up of A component and B component, and described A component is made of polyaspartic acid ester resin, solvent, this Composed of polyaniline, pigments, functional fillers, thixotropic agents, ultraviolet absorbers and auxiliary agents; the B component is a curing agent; The molar ratio of the hydroxyl-OH of the A component to the isocyanate-NCO of the B component is (1.0-1.2): 1.0; Among them, in component A, the mass ratio of polyaspartic acid ester resin, solvent, intrinsic polyaniline, pigment, functional filler, thixotropic agent, ultraviolet absorber and additive is (30-50): (4- 10): (2~5): (20~30): (25~40): (1~2): (1~3): (1~3). 2. The polyaniline-containing polyaspartate polyurea anticorrosion coating according to claim 1, characterized in that: the intrinsic polyaniline is intrinsic polyaniline with a molecular weight of 10,000-100,000. 3. the polyaniline-containing polyaspartic acid ester polyurea anticorrosion coating according to claim 1, is characterized in that: described polyaspartic acid ester resin is polyaspartic acid ester resin F-520, polyaspartic acid ester resin F-520, polyaspartic acid ester resin Any two of aspartic acid ester resin F-524 and polyaspartic acid ester resin F-420. 4. the polyaniline-containing polyaspartic acid ester polyurea anticorrosion coating according to claim 1 is characterized in that: the solvent is propylene glycol methyl ether acetate. 5. The polyaniline-containing polyaspartate polyurea anticorrosion coating according to claim 1, characterized in that: the pigment is any one or both of titanium dioxide and carbon black. 6. The polyaniline-containing polyaspartate polyurea anticorrosion coating according to claim 1, wherein the functional filler is one or more of mica powder, zinc oxide, and precipitated barium sulfate. 7. the polyaniline-containing polyaspartic ester polyurea anticorrosion coating according to claim 1 is characterized in that: the thixotropic agent comprises any one in organic bentonite or polyamide wax; The agent is any one of ultraviolet absorber UV-0, ultraviolet absorber UV-9, and ultraviolet absorber UV-24. 8. the polyaniline-containing polyaspartic ester polyurea anticorrosion coating according to claim 1 is characterized in that: said auxiliary agent is leveling agent, wetting and dispersing agent, defoamer; The agent is a polyacrylate solution, the model is any one of BYK-352, BYK-354, BYK-358N; the wetting and dispersing agent is a high molecular weight block copolymer solution containing pigment affinity groups, the model is Any one of BYK161, BYK164, BYK9077; the defoamer is a foam-breaking polysiloxane solution, and the model is any one of BYK-A530, BYK-066N, BYK-072. 9. the polyaniline-containing polyaspartic ester polyurea anticorrosion coating according to claim 1 is characterized in that: the curing agent is aliphatic polyisocyanate N-3390, aliphatic polyisocyanate N-3200, fat Any one of the family polyisocyanate N-3600. 10. A method for preparing the polyaniline-containing polyaspartic ester polyurea anticorrosion coating described in any one of claims 1-9, is characterized in that: the method may further comprise the steps: Step 1. According to the mass ratio of polyaspartic acid ester resin, solvent, intrinsic polyaniline, pigment, functional filler, thixotropic agent, ultraviolet absorber and auxiliary agent (30-50): (4-10) : (2~5): (20~30): (25~40): (1~2): (1~3): (1~3) respectively mix polyaspartic acid ester resin, solvent, intrinsic State polyaniline, pigments, functional fillers, thixotropic agents, ultraviolet absorbers, and additives are placed in the disperser in order to disperse. The linear speed of the agitator in the disperser is above 15m/s. Grind with a mill to a fineness of ≤40um, filter and package to obtain component A; step 2, divide the curing agent into separate packages, and use it as component B; step 3, package component A and component B separately, and use it according to The molar ratio of hydroxyl-OH of component A and isocyanate group-NCO of component B is (1.0-1.2): 1.0 and mixed evenly to obtain polyaniline-containing polyaspartate polyurea anticorrosion coating.