CN117050637A - Micro-nano modified high weather-resistant anti-corrosion polyurethane coating and preparation method thereof - Google Patents

Abstract

The invention discloses a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating and a preparation method thereof; the coating is composed of component A and component B. The component A includes, in terms of mass fraction: 20 to 30% of polyester polyol resin %, hydroxy acrylic resin 20 to 30%, solvent 12 to 18%, wetting and dispersing agent 1 to 5%, thixotropic agent 1 to 3%, light stabilizer 0.5 to 2%, antioxidant 0.5 to 1%, ultraviolet rays Absorbent 0.5~2%, coupling agent 0.5~2%, defoaming agent 1~2%, leveling agent 0.5~2%, curing accelerator 0.1~1%, filler 30~60%; Component B is by mass The score calculation includes: HDI trimer 80-90%, solvent 10-20%; the micro-nano modified high weather-resistant and anti-corrosion polyurethane coating provided by the present invention has excellent anti-corrosion and weather resistance properties, and is suitable for high humidity, It has a good protective effect against high salt spray, strong ultraviolet rays, etc., the preparation process is simple and efficient, and the construction performance is good. It is especially suitable for the protective coating of steel structure equipment such as offshore wind power platforms, offshore oil drilling platforms, and docks and ports.

Description

A kind of micro-nano modified high weather-resistant and anti-corrosion polyurethane coating and its preparation method

Technical field

The invention specifically relates to a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating and a preparation method thereof, and belongs to the technical field of anti-corrosion and weather-resistant coatings.

Background technique

With the continuous expansion of the scale of the marine economy, more and more large-scale offshore engineering equipment is put into use in the marine environment, such as offshore wind power, oil drilling platforms, etc. The service life of these steel structure equipment is generally required to be longer (10 to 30 years ), but it faces a harsh marine corrosive environment. It has been in an environment of alternating dryness and wetness, alternating high and low temperatures, high salt spray, and strong ultraviolet rays for a long time. Therefore, higher requirements are put forward for the anti-corrosion protection of steel structure equipment. At present, the anti-corrosion protective coating of marine steel structure equipment generally adopts a three-layer protective structure of bottom, middle and surface. The topcoat is on the top surface of the protective coating and faces direct erosion from sea water, salt spray and high-intensity ultraviolet radiation. It is required to have high corrosion resistance and weather resistance, so polyurethane is generally used as the topcoat.

Polyurethane is a type of polymer containing urethane groups. It usually has high strength, wear resistance, solvent resistance and other properties. It has a wide variety of raw materials. Polyurethane can be adjusted in a wide range by adjusting the structure and molecular weight of hydroxyl compounds. performance. Polyester polyol and acrylic polyol resin are two commonly used categories of high-solid two-component polyurethane coatings, but each has limitations when used; the two-component high-solid polyurethane coating prepared using acrylic polyol resin as the raw resin The film-forming material has a large molecular weight and high viscosity. When used, especially in low-temperature environments, solvents must be added to reduce the solid content of the construction, thus increasing VOC emissions during the coating construction process, which is not conducive to green environmental protection. At the same time, the mechanical properties of the high-solid polyurethane coating prepared from acrylic polyol resin as raw material are poor and cannot meet the needs of certain use environments; the two-component high-solid polyurethane coating prepared from polyester polyol resin as raw material Polyurethane coatings take advantage of the characteristics of polyester polyols such as low viscosity and high solid content. They can be used directly without adding solvents during construction. However, low-viscosity polyester polyols have low molecular weight and poor curing performance at room temperature, which cannot meet the requirements of coating construction. Require.

The patent with the publication number CN107641450A "A high solid content and high weather-resistant polyurethane coating and its preparation method" discloses a two-component high weather-resistant polyurethane coating including component A and component B, prepared with polyester polyol resin as raw material High-solid polyurethane coatings add asparagus resin to polyester polyol and use polyisocyanate as the curing agent. The heat generated when the aspartame resin reacts with the polyisocyanate is supplied to the curing process of the polyester polyol, which enhances the coating's performance at room temperature. curing properties.

However, for the special use environment of the ocean, if the modification of the coating only adjusts the resin body, it is far from meeting the requirements for the long-term use of polyurethane coatings in the marine environment. Water molecules, oxygen, chloride ions and other media will interact with the surface for a long time. When paint comes into contact, it will gradually diffuse into the coating, weakening the adhesion of the coating. Ultraviolet rays cause the polymer molecules to break and degrade. Eventually, the structure of the topcoat coating is destroyed, causing the intermediate paint and primer to be exposed, accelerating the The protective layer falls off and fails.

Contents of the invention

In order to solve the problems existing in the prior art, the present invention provides a micro-nano modified highly weather-resistant and anti-corrosion polyurethane coating and a preparation method thereof. It has good protective effects against salt spray, strong ultraviolet rays, etc., the preparation process is simple and efficient, and the construction performance is good.

The technical solution of the present invention is as follows:

One of the objects of the present invention is to provide a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating. The coating is composed of component A and component B. Calculated in terms of mass fraction, the component A includes the following components:

The B component includes the following ingredients:

HDI trimer 80～90%

Solvent 10~20%;

Wherein, the component A and component B are mixed in a mass ratio of 2 to 4:1.

Preferably, the polyester polyol resin is a mixture of polyester diol and polyester triol, and the polyester polyol has a molecular weight of 500 to 1,000.

Preferably, the solvent in component A is one, two or a mixture of three of xylene, propylene glycol methyl ether and butyl acetate; the solvent in component B is butyl acetate.

Preferably, the wetting and dispersing agent is one or a mixture of two of organosiloxane copolymers or hydroxyl functional carboxylates containing pigment affinity groups.

Preferably, the thixotropic agent is one or a mixture of polyamide wax or modified polyurea.

Preferably, the light stabilizer is a hindered amine light stabilizer.

Preferably, the antioxidant is a hindered phenolic antioxidant.

Preferably, the ultraviolet absorber is one or a mixture of two liquid formamidine and benzophenone ultraviolet absorbers.

Preferably, the coupling agent is one, two or a mixture of three of titanate, aluminate and silane coupling agents.

Preferably, the defoaming agent is one or a mixture of two types of silicone and polyether defoaming agents.

Preferably, the leveling agent is one or a mixture of two of acrylic and polyester leveling agents.

Preferably, the curing accelerator is one or a mixture of bismuth isooctanoate and zinc isooctanoate.

Preferably, the micro-nano size filler is at least three of ultrafine precipitated barium sulfate, organic bentonite, nano-rutile titanium dioxide, and ultrafine talc powder. The particle size of the ultrafine precipitated barium sulfate is 2000 to 4000 mesh. The particle size of talc powder is 6000-8000 mesh, and the particle size of nano-rutile titanium dioxide is 20-100nm.

The invention also provides a preparation method of micro-nano modified high weather-resistant and anti-corrosion polyurethane coating, which includes the following steps:

(1) Add the solvent in component A into the dispersion tank in proportion and stir, add the coupling agent while stirring continuously, and disperse and mix at a rotating speed of 400 to 600r/min;

(2) Add polyester polyol, hydroxy acrylic resin, wetting and dispersing agent, thixotropic agent, UV absorber, antioxidant, light stabilizer, defoaming agent, leveling agent and curing accelerator in proportion to In the above dispersion tank, stir while adding, and disperse and mix at a rotation speed of 1000-1200r/min;

(3) Add the filler to the above-mentioned dispersion tank in proportion, stir while adding, pass cooling water into the wall of the dispersion tank for cooling, and disperse and mix at a rotation speed of 2800 to 3200r/min to obtain component A of the coating;

(4) Add HDI trimer and solvent into another dispersion tank in proportion and disperse and mix at a rotation speed of 1000 to 1200 r/min to obtain component B of the coating;

(5) Mix component A and component B in proportion in a dispersion tank to obtain micro-nano modified high weather-resistant and anti-corrosion polyurethane coating.

Preferably, when adding micro-nano hybrid fillers in step (3), stir for at least 10 minutes after adding one filler, and then add the next filler.

Compared with the existing technology, the beneficial effects of the present invention are:

(1) In the present invention, a compound of polyester polyol resin and hydroxy acrylic resin is used as the coating matrix without adding other modified resins, and the linear long chain structure of the polyester diol in the polyester polyol is utilized. After curing, it can provide high elasticity and high toughness to the paint film. Polyester triol has a branched chain structure, which can cross-link the network structure after curing. It can provide high strength, high hardness and strong adhesion to the paint film. Hydroxy acrylic resin At the same time, it can assist the cross-linking process to form a network structure, and has good gloss, flatness, and uniformity, which can provide a better appearance to the paint film; the three components can produce synergistic and complementary effects with each other during the reaction process, promoting the cross-linking process. , and all three types of resins have good weather resistance, solvent resistance, salt spray corrosion resistance and other properties after curing, and have obvious advantages as topcoats for marine anti-corrosion coatings;

(2) The fillers used in the present invention are micro- and nano-sized mixed fillers, and a coupling agent is added to component A. After treatment with the coupling agent, the micro- and nano-sized mixed fillers can have a good combination with the matrix resin material. , and well dispersed, the paint film is bright in color, and has good wear resistance and impact resistance; among them, the ultrafine precipitated barium sulfate in the filler is a filler with a primary particle size of microns, which has good hiding power and relatively good corrosion resistance. Good, it can enhance the impact resistance of the coating; ultrafine talc powder is a filler with a primary particle size of micron, has a layered crystal structure, has a good shielding effect on seawater, salt spray, oxygen and other media, and can improve the coating's Rheological properties can improve the hardness of the paint film; nano-rutile titanium dioxide is a filler with a native particle size of nanometers. It is a pigment and filler with excellent comprehensive properties. It has strong hiding power and good absorption of ultraviolet rays, which can effectively improve the performance of paint films. The coating has good weather resistance, good chemical stability, acid and alkali corrosion resistance, and salt spray resistance, which can effectively extend the service life of the coating; in addition to good corrosion resistance and wear resistance, organic bentonite can also improve the performance of the coating. Thixotropic properties and suspension stability can effectively prevent fillers from being deposited too quickly; after the fillers are evenly dispersed into the resin to form a film, the anti-corrosion and weather resistance of the coating is significantly improved;

(3) The curing agent used in the present invention is an aliphatic isocyanate curing agent HDI trimer, which has excellent weather resistance and gloss and color retention. It does not contain an aromatic ring structure, so it will not cause yellowing and avoid HDI. Disadvantages of high volatility, better safety, high -NCO content, good miscibility with resin, and good curing effect;

(4) The preparation process adopted in the present invention is simple, requires no special equipment, and has good dispersion effect. According to the fineness plate test, the filler particle size in the paint is below 5 μm.

Detailed ways

The present invention will be further described below with reference to preferred embodiments. The examples given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

Materials, reagents, etc. used in the following examples can all be obtained from commercial sources unless otherwise specified.

Example 1

This embodiment provides a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating, which is composed of component A and component B. Calculated according to mass fraction, component A includes 20% polyester polyol resin and 30% hydroxy acrylic acid. Resin, 12% xylene solvent, 1% organosiloxane copolymer as wetting and dispersing agent, 3% modified polyurea as thixotropic agent, 0.5% hindered amine light stabilizer, 0.5% hindered Phenolic antioxidant, 0.5% benzophenone UV absorber, 0.9% silane coupling agent, 1% silicone defoaming agent, 0.5% acrylate leveling agent, 0.1% isooctanoic acid Bismuth and 30% micro-nano hybrid filler, component B includes 80% HDI trimer and 20% ethyl acetate;

Among them, the polyester polyol resin is a mixture of polyester diol and polyester triol, and the molecular weight of the polyester polyol is 500 to 1000; the viscosity of the hydroxy acrylic resin is 5000 to 10000 mPa·s at normal temperature; the micro-nano The mixed filler is a mixture of ultra-fine precipitated barium sulfate, organic bentonite, and nano-rutile titanium dioxide. The particle size of the ultra-fine precipitated barium sulfate is 2000-4000 mesh, and the particle size of nano-rutile titanium dioxide is 20-100 nm;

The preparation method of micro-nano modified highly weather-resistant and anti-corrosion polyurethane coating prepared from the above components includes the following steps:

(1) Add the xylene solvent in component A into the dispersion tank in proportion and stir, add the silane coupling agent while stirring continuously, and disperse and mix for 10 minutes at a rotation speed of 400r/min;

(2) Combine polyester polyol, hydroxy acrylic resin, organosiloxane copolymer, modified polyurea, benzophenones, hindered phenolic antioxidants, hindered amine light stabilizers, silicone defoaming agents, Acrylate leveling agent and bismuth isooctanoate are added in proportion to the above-mentioned dispersion tank, stir while adding, and disperse and mix at a rotation speed of 1200r/min for 20 minutes;

(3) Add the mixed filler of ultrafine precipitated barium sulfate, organic bentonite, and nano-rutile titanium dioxide into the above-mentioned dispersion tank in sequence, stir while adding, stir for at least 10 minutes after adding one filler, then add the next filler, and disperse Pour cooling water into the tank wall for cooling, and disperse and mix at a rotation speed of 2800r/min for 1 hour to obtain component A of the paint;

(4) Add HDI trimer and ethyl acetate into another dispersion tank in proportion and disperse and mix at 1000r/min for 10 minutes to obtain component B of the coating;

(5) Mix component A and component B in a dispersion tank at a mass ratio of 2:1 to obtain a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating.

Example 2

This embodiment provides a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating, which is composed of component A and component B. Calculated according to mass fraction, component A includes 22% polyester polyol resin and 20% hydroxy acrylic acid. Resin, 14% propylene glycol methyl ether solvent, 2% hydroxyl functional carboxylate containing pigment affinity groups as wetting and dispersing agent, 2% polyamide wax as thixotropic agent, 1% hindered amine light stabilization agent, 1% hindered phenolic antioxidant, 1% benzophenone UV absorber, 1% titanate coupling agent, 2% silicone defoaming agent, 1% polyester flow Leveling agent, 0.5% bismuth isooctanoate and 32.5% micro-nano hybrid filler, component B includes 90% HDI trimer and 10% ethyl acetate;

Among them, the polyester polyol resin is a mixture of polyester diol and polyester triol, and the molecular weight of the polyester polyol is 500 to 1000; the viscosity of the hydroxy acrylic resin is 5000 to 10000 mPa·s at normal temperature; the micro-nano The mixed filler is a mixture of organic bentonite, nano-rutile titanium dioxide, and ultra-fine talc powder; the particle size of the nano-rutile titanium dioxide is 20 to 100 nm, and the particle size of the ultra-fine talc powder is 6,000 to 8,000 mesh;

The preparation method of micro-nano modified highly weather-resistant and anti-corrosion polyurethane coating prepared from the above components includes the following steps:

(1) Add the propylene glycol methyl ether solvent in component A into the dispersion tank in proportion and stir, add the titanate coupling agent while stirring continuously, and disperse and mix at a rotation speed of 600r/min for 10 minutes;

(2) Combine polyester polyol, hydroxy acrylic resin, hydroxy functional carboxylate containing pigment affinity groups, polyamide wax, benzophenone ultraviolet absorber, hindered phenolic antioxidant, hindered amine light stabilizer , silicone defoaming agent, polyester leveling agent, and bismuth isooctanoate are added in proportion to the above dispersion tank, stir while adding, and disperse and mix at a rotation speed of 1000r/min for 20 minutes;

(3) Add organic bentonite, nano-rutile titanium dioxide, and ultrafine talc powder to the above-mentioned dispersion tank in sequence, stir while adding, add one filler and stir for at least 10 minutes, then add the next filler, and pass through the wall of the dispersion tank. Pour in cooling water for cooling, and disperse and mix at a rotation speed of 3000r/min for 1 hour to obtain component A of the coating;

(4) Add HDI trimer and ethyl acetate into another dispersion tank in proportion and disperse and mix at 1100r/min for 10 minutes to obtain component B of the coating;

(5) Mix component A and component B in a dispersion tank at a mass ratio of 4:1 to obtain a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating.

Example 3

This embodiment provides a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating, which is composed of component A and component B. Calculated according to mass fraction, component A includes 30% polyester polyol resin and 22% hydroxy acrylic acid. Resin, 18% butyl acetate solvent, 1% hydroxyl functional carboxylate containing pigment affinity groups as wetting and dispersing agent, 1% modified polyurea as thixotropic agent, 2% hindered amine light Stabilizer, 0.5% hindered phenolic antioxidant, 2% liquid formamidine reagent as ultraviolet absorber, 0.5% silane coupling agent, 1.5% polyether defoaming agent, 0.5% acrylate Similar leveling agent, 1% zinc isooctanoate and 20% micro-nano hybrid filler, component B includes 85% HDI trimer and 15% ethyl acetate;

Among them, the polyester polyol resin is a mixture of polyester diol and polyester triol, and the molecular weight of the polyester polyol is 500 to 1000; the viscosity of the hydroxy acrylic resin is 5000 to 10000 mPa·s at normal temperature; the micro-nano The mixed filler is a mixture of ultra-fine precipitated barium sulfate, nano-rutile titanium dioxide, and ultra-fine talc powder. The particle size of ultra-fine precipitated barium sulfate is 2000-4000 mesh, the particle size of ultra-fine talc powder is 6000-8000 mesh, and the particle size of nano-rutile The particle size of titanium dioxide is 20~100nm;

The preparation method of micro-nano modified highly weather-resistant and anti-corrosion polyurethane coating prepared from the above components includes the following steps:

(1) Add the butyl acetate in component A into the dispersion tank in proportion and stir, add the silane coupling agent while stirring continuously, and disperse and mix at a rotation speed of 500r/min for 10 minutes;

(2) Combine polyester polyol, hydroxy acrylic resin, hydroxy functional carboxylate containing pigment affinity groups, modified polyurea, liquid formamidine reagents, hindered phenolic antioxidants, and hindered amine light stabilizers , polyether defoaming agent, acrylic leveling agent, and zinc isooctanoate are added to the above dispersion tank in sequence in proportion, stir while adding, and disperse and mix at a rotation speed of 1100r/min for 20 minutes;

(3) Add ultra-fine precipitated barium sulfate, nano-rutile titanium dioxide, and ultra-fine talc powder to the above-mentioned dispersion tank in sequence, stir while adding, add one filler and stir for at least 10 minutes, then add the next filler, and the dispersion tank Pour cooling water into the wall for cooling, and disperse and mix at a rotation speed of 3200r/min for 1 hour to obtain component A of the coating;

(4) Add HDI trimer and ethyl acetate into another dispersion tank in proportion and disperse and mix at 1200r/min for 10 minutes to obtain component B of the coating;

(5) Mix component A and component B in a dispersion tank at a mass ratio of 3:1 to obtain a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating.

Example 4

This embodiment provides a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating, which is composed of component A and component B. Calculated according to mass fraction, component A includes 25% polyester polyol resin and 25% hydroxy acrylic acid. Resin, 12% xylene and propylene glycol methyl ether mixed solvent, 5% organosiloxane copolymer as wetting and dispersing agent, 2% modified polyurea and polyamide wax mixed reagent as thixotropic agent, 1% Hindered amine light stabilizer, 1% hindered phenolic antioxidant, 1.5% liquid formamidine reagent as UV absorber, 2% aluminate coupling agent, 1% polyether defoaming agent agent, 0.5% polyester leveling agent, 0.5% zinc isooctanoate and 23.5% micro-nano hybrid filler, component B includes 85% HDI trimer and 15% ethyl acetate;

Among them, the polyester polyol resin is a mixture of polyester diol and polyester triol, and the molecular weight of the polyester polyol is 500 to 1000; the viscosity of the hydroxy acrylic resin is 5000 to 10000 mPa·s at normal temperature; the micro-nano The mixed filler is a mixture of ultra-fine precipitated barium sulfate, nano-rutile titanium dioxide, and organic bentonite; the particle size of the ultra-fine precipitated barium sulfate is 2000-4000 mesh, and the particle size of nano-rutile titanium dioxide is 20-100 nm;

The preparation method of micro-nano modified highly weather-resistant and anti-corrosion polyurethane coating prepared from the above components includes the following steps:

(1) Add the solvent in component A into the dispersion tank in proportion and stir, add the coupling agent while stirring continuously, and disperse and mix for 10 minutes at a rotation speed of 450r/min;

(2) Mix polyester polyol, hydroxy acrylic resin, organosiloxane copolymer, modified polyurea and polyamide wax mixed reagent, liquid formamidine reagent, hindered phenolic antioxidant, hindered amine light stabilization Agent, polyether defoaming agent, polyester leveling agent, and zinc isooctanoate are added to the above-mentioned dispersion tank in sequence in proportion, stir while adding, and disperse and mix at a rotation speed of 1200r/min for 20 minutes;

(3) Add ultrafine precipitated barium sulfate, nano-rutile titanium dioxide, and organic bentonite to the above-mentioned dispersion tank in sequence, stir while adding, add one filler and stir for at least 10 minutes, then add the next filler, and disperse in the tank wall Pour in cooling water for cooling, and disperse and mix at a rotation speed of 2900r/min for 1 hour to obtain component A of the paint;

(4) Add HDI trimer and ethyl acetate into another dispersion tank in proportion and disperse and mix at 1100r/min for 10 minutes to obtain component B of the coating;

(5) Mix component A and component B in a dispersion tank at a mass ratio of 4:1 to obtain a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating.

Example 5

This embodiment provides a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating, which is composed of component A and component B. Calculated according to the mass fraction, component A includes 20% polyester polyol resin and 20% hydroxy acrylic acid. Resin, 12% xylene and propylene glycol methyl ether mixed solvent, 3% organosiloxane copolymer and hydroxyl functional carboxylate containing pigment affinity groups are wetting and dispersing agents, 1% polyamide The wax is a thixotropic agent, 0.5% hindered amine light stabilizer, 0.5% hindered phenolic antioxidant, 0.5% liquid formamidine reagent, 0.5% titanate coupling agent, 2% organic Silicon defoamer, 2% acrylic leveling agent, 0.2% bismuth isooctanoate and 37.8% micro-nano hybrid filler, component B includes 90% HDI trimer and 10% ethyl acetate;

Among them, the polyester polyol resin is a mixture of polyester diol and polyester triol, and the molecular weight of the polyester polyol is 500 to 1000; the viscosity of the hydroxy acrylic resin is 5000 to 10000 mPa·s at normal temperature; the micro-nano The mixed filler is a mixture of ultrafine precipitated barium sulfate, organic bentonite, and ultrafine talc powder.

The preparation method of micro-nano modified highly weather-resistant and anti-corrosion polyurethane coating prepared from the above components includes the following steps:

(1) Add the mixed solvent of xylene and propylene glycol methyl ether in component A into the dispersion tank in proportion and stir. Add the titanate coupling agent while stirring continuously, and disperse and mix for 10 minutes at a rotation speed of 600r/min. ;

(2) Mix reagents of polyester polyol, hydroxy acrylic resin, organosiloxane copolymer and hydroxyl functional carboxylate containing pigment affinity groups, polyamide wax, liquid formamidine reagents, hindered phenolic antioxidants Oxygen agent, hindered amine light stabilizer, silicone defoaming agent, acrylate leveling agent, and bismuth isooctanoate are added to the above dispersion tank in sequence in proportion, stir while adding, and disperse and mix at a rotation speed of 1000r/min. 20min;

(3) Add ultrafine precipitated barium sulfate, organic bentonite, and ultrafine talc powder to the above-mentioned dispersion tank in sequence, stir while adding, add one filler and stir for at least 10 minutes, then add the next filler, and disperse in the tank wall Pour in cooling water for cooling, and disperse and mix at a rotation speed of 3100r/min for 1 hour to obtain component A of the paint;

(4) Add HDI trimer and ethyl acetate into another dispersion tank in proportion and disperse and mix at 1200r/min for 10 minutes to obtain component B of the coating;

(5) Mix component A and component B in a dispersion tank at a mass ratio of 2:1 to obtain a micro-nano modified high weather-resistant and anti-corrosion polyurethane coating.

The above are only examples of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the content of the description of the present invention, or directly or indirectly applied in other related technical fields, shall be regarded as Likewise, it is included in the patent protection scope of the present invention.

Claims (15)

1. The micro-nano modified high weather-proof anti-corrosion polyurethane coating is characterized by comprising a component A and a component B, wherein the component A comprises the following components in percentage by mass:

the component B comprises the following components:

80 to 90 percent of HDI trimer

10-20% of solvent;

wherein the component A and the component B are mixed according to the mass ratio of 2-4:1.

2. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the polyester polyol resin is a mixture of polyester diol and polyester triol, and the molecular weight of the polyester polyol is 500-1000.

3. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the solvent in the component A is one, two or three of dimethylbenzene, propylene glycol methyl ether and butyl acetate; the solvent in the component B is butyl acetate.

4. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the wetting dispersant is one or a mixture of two of an organosiloxane copolymer or a hydroxy-functional carboxylate containing pigment affinity groups.

5. The micro-nano modified high weather-resistant anti-corrosion polyurethane coating according to claim 1, wherein the thixotropic agent is one or a mixture of two of polyamide wax and modified polyurea.

6. The micro-nano modified high weather-resistant anti-corrosion polyurethane coating according to claim 1, wherein the light stabilizer is a hindered amine light stabilizer.

7. The micro-nano modified high weather-resistant anti-corrosion polyurethane coating according to claim 1, wherein the antioxidant is a hindered phenol antioxidant.

8. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the ultraviolet absorber is one or a mixture of two of liquid formamidine and benzophenone ultraviolet absorbers.

9. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the coupling agent is one, two or three of titanate, aluminate and silane coupling agents.

10. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the defoaming agent is one or a mixture of two of organosilicon and polyether defoaming agents.

11. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the leveling agent is one or a mixture of two of acrylic esters and polyester leveling agents.

12. The micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, wherein the curing accelerator is one or a mixture of two of bismuth iso-octoate and zinc iso-octoate.

13. The micro-nano modified high weather-proof anticorrosive polyurethane coating according to claim 1, wherein the micro-nano filler is at least three of ultrafine precipitated barium sulfate, organic bentonite, nano rutile type titanium dioxide and ultrafine talcum powder, the particle size of the ultrafine precipitated barium sulfate is 2000-4000 meshes, the particle size of the ultrafine talcum powder is 6000-8000 meshes, and the particle size of the nano rutile type titanium dioxide is 20-100 nm.

14. A method for preparing the micro-nano modified high weather-proof anti-corrosion polyurethane coating according to claim 1, which is characterized by comprising the following steps:

(1) Adding the solvent in the component A into a dispersing tank according to a proportion, stirring, adding a coupling agent under the condition of continuous stirring, and dispersing and mixing at the rotating speed of 400-600 r/min;

(2) Sequentially adding polyester polyol, hydroxy acrylic resin, wetting dispersant, thixotropic agent, ultraviolet absorbent, antioxidant, light stabilizer, defoamer, leveling agent and curing accelerator into the dispersion tank according to a proportion, stirring while adding, and dispersing and mixing at a rotating speed of 1000-1200 r/min;

(3) Adding filler into the dispersing tank in proportion, stirring while adding, introducing cooling water into the wall of the dispersing tank for cooling, and dispersing and mixing at the rotating speed of 2800-3200 r/min to obtain a component A of the coating;

(4) Sequentially adding the HDI trimer and the solvent into another dispersing tank according to a proportion, and dispersing and mixing at the rotating speed of 1000-1200 r/min to obtain a component B of the coating;

(5) And mixing the component A and the component B in proportion in a dispersion tank to obtain the micro-nano modified high weather-proof anticorrosive polyurethane coating.

15. The method for preparing the micro-nano modified high weather-proof and anti-corrosion polyurethane coating according to claim 14, wherein when the micro-nano mixed filler is added in the step (3), the stirring is carried out for at least 10min after one filler is added, and then the next filler is added.