CN114933847A - White snow coating and preparation method thereof - Google Patents

Abstract

The invention relates to a white snow coating and a preparation method thereof, wherein the white snow coating comprises a base material, a transition layer, a bonding layer, a reflecting layer and a sealing layer; the base material is various flame-retardant fabrics, metal plates or composite plates; the transition layer is a water-based white coating, and the thickness of the transition layer is not less than 10 mu m; the bonding layer is uniformly coated on the surface of the transition layer, and the thickness of the bonding layer is not more than 5 mu m; the reflecting layer is a snowfield reflecting coating coated on the surface of the bonding layer, and the thickness of the reflecting layer is not less than 10 mu m; the sealing layer thickness is no more than 5 microns. According to the invention, by designing the snow coating with the multilayer structure, high ultraviolet reflectivity is obtained, the weather resistance of the snow coating is optimized, the snow coating is subjected to an artificial accelerated aging test, the snow coating does not have the phenomena of hardening, falling, cracking and the like before and after the test, and the ultraviolet reflectivity and whiteness of the coating are basically kept unchanged.

Description

White snow coating and preparation method thereof

Technical Field

The invention belongs to the field of camouflage protection, and particularly relates to a white snow coating and a preparation method thereof.

Background

With the development of reconnaissance technology, the snow environment is taken as an important background of modern war, and the protection of the snow background is more and more emphasized. Although the existing snowfield camouflage equipment can directly obtain camouflage textiles with higher reflectivity in ultraviolet wave bands and visible light wave bands by directly coating silicon oxide, zirconium oxide and other coatings on the surface of a base material, the snowfield coatings are hard and the surface is easily infected with large-area pollutants with the increase of the use frequency, the reflectivity and the whiteness of the snowfield coatings are greatly reduced, and the requirement of the snowfield camouflage equipment on the snowfield background cannot be met.

Disclosure of Invention

The invention aims to solve the technical problem of providing a white snow coating and a preparation method thereof aiming at the defects of the background art. The white snow coating prepared by the method has high ultraviolet visible light and near infrared band reflectivity, and has the performances of softness, weather resistance, wear resistance, self-cleaning and the like, the problems that the existing snow coating is easy to dirty and harden and the emissivity is greatly reduced after use are solved, and the protective capability of snow camouflage is greatly improved.

The invention adopts the following technical scheme for solving the technical problems:

a white snow coating comprises a base material, a transition layer, a bonding layer, a reflecting layer and a sealing layer from inside to outside in sequence;

the substrate is a fabric, a metal or an organic composite material;

the transition layer is a water-based white coating and is prepared by forming a film by 25-45% of a film forming substance I, 20-50% of a white material I, 0.1-0.5% of an auxiliary agent I and water;

the bonding layer is prepared by curing and film-forming 40-50% of a second film-forming material, 5-10% of a second auxiliary agent and 35-55% of a second solvent by mass percent respectively;

the reflecting layer is a white coating, and the coating is prepared by filming 30-50% of a filming substance III, 30-45% of a white material III, 0.1-0.5% of an auxiliary agent III and a solvent III in percentage by mass;

the sealing layer is prepared by filming 40-50% of film forming substance IV, 10% of pigment and filler IV, 0.2-0.5% of auxiliary agent IV and 40-50% of solvent IV by mass percentage;

further, the thickness of the transition layer is not less than 10 μm.

Further, the film forming material I is water-based acrylic acid or polyurethane; the white material I is a mixture of nano zirconia and magnesia, and the mass ratio of the nano zirconia to the magnesia is as follows: magnesium oxide (3-4): (1-0); the first auxiliary agent is 0.1-0.5% of dispersant, 0.1-0.5% of softening agent and the balance of water.

Further, the bonding layer has a thickness of not more than 5 μm.

Further, the film forming substance II is oil-based polyurethane; the second auxiliary agent is an adhesion promoter or a tackifier; the second solvent is at least one of toluene, dimethylformamide and n-butyl acetate.

Further, the thickness of the reflecting layer is not less than 10 μm.

Further, the film forming material III is at least one of polyurethane and acrylic acid; the white material III is at least one plastic particle or a mixture of plastic particles of nano zirconium oxide, barium sulfate and micron-sized PVC, PE and PVDF; the third auxiliary agent is 0.1-0.5% of dispersant and 0.1-0.5% of softener; and the third solvent is water.

Further, the film forming material IV is at least one of vinyl chloride-vinyl acetate resin or ethylene-propylene resin; the pigment and filler IV is at least one of calcium sulfate, wax powder, silicon dioxide, fluorescent white and self-cleaning coating; the auxiliary agent IV is a dispersant; the solvent IV is at least one of toluene and dimethylformamide.

The preparation method of the white snow coating comprises the following steps:

s1: preparing a transition layer solution: according to the mass ratio (25-45): (20-50): (0.1-0.5):

(35-50) respectively weighing a film forming substance I, a white material I (nano zirconium oxide and magnesium oxide), an auxiliary agent I and water in a container, uniformly dispersing by using a high-speed dispersion machine to obtain a transition layer solution, and sealing for later use;

s2: preparing a bonding layer solution: according to the mass ratio (40-50): (5-10): (35-55) respectively weighing a film forming substance II, an auxiliary agent II and a solvent II in proportion into a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a bonding layer solution for later use;

s3: preparing a reflecting layer solution: according to the mass ratio (30-50): (30-45): (0.1-0.5): (30-40) respectively weighing a film forming substance III, a white material III, an auxiliary agent III and a solvent III in proportion in a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a reflecting layer solution for later use;

s4: preparing a sealing layer solution: the mass ratio of (40-50): 10: (0.2-0.5): (40-50) respectively weighing a film forming substance IV, a white material IV, an auxiliary agent IV and a solvent IV in a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a sealing layer solution for later use;

s5: preparing a transition layer: directly coating the transition layer solution on the surface of a base material by using a scraper and a wire bar, then placing the base material coated with the solution in an oven for curing to form a film, controlling the temperature of the oven at 100-120 ℃, controlling the drying time at 1-2 min, and simultaneously controlling the thickness of the coating to be not less than 10 mu m;

s6: preparing a bonding layer: directly coating the bonding layer solution on the surface of the transition layer by using a scraper and a wire bar, and then placing the transition layer solution in an oven to be cured to form a film, wherein the temperature of the oven is controlled to be 80-100 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled not to exceed 5 mu m;

s7: preparing a reflecting layer: directly coating the reflecting layer solution on the surface of the bonding layer by using a scraper and a wire bar, then placing the bonding layer solution in a drying oven for curing to form a film, controlling the temperature of the drying oven at 100-120 ℃, controlling the drying time at 1-2 min, and simultaneously controlling the thickness of the coating to be not less than 10 mu m;

s8: preparing a sealing layer: and (3) directly coating the sealing layer solution on the surface of the reflecting layer by using a scraper and a wire bar, and then placing the reflecting layer solution in an oven to be cured into a film, wherein the temperature of the oven is controlled to be 80-100 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled not to exceed 5 mu m.

Compared with the prior art, the invention adopting the technical scheme has the following technical effects:

the white snow coating is obtained by sequentially coating the transition layer, the bonding layer, the reflecting layer and the sealing layer on the surface of the base material, and has the advantages of higher ultraviolet reflectivity and whiteness, softness, excellent weather resistance, scraping resistance and antifouling property. The concrete expression is as follows:

1. high uv reflectance and whiteness: the white snow coating prepared by the invention has the reflectivity (f) at the ultraviolet wave band of 350nm ₃₅₀ ) Not less than 80 percent, and the whiteness (W) is not less than 100, thereby meeting the requirement of ultraviolet protection.

2. Flexibility: the white snow coating prepared by the invention is added with the softening agent, and the flexibility of the material is kept after film forming.

3. Weather resistance and stain resistance: the existence of multilayer structure has both solved the ageing resistance of magnesium oxide material in the transition layer and has improved the lower and poor problem of shading effect of material reflectivity in the reflection stratum, and the existence of sealing layer has further improved the ageing resistance of material, through carrying out artifical accelerated ageing tests to the material, the ultraviolet reflectivity and the whiteness degree of coating ageing are hardly changed, and the coating does not have sclerosis and fracture shedding phenomenon, and white coating places the back surface in the air and is not infected with or is infected with few grey layer simultaneously, has certain antifouling ability.

4. Scratch resistance: the white snow coating prepared by the invention has the advantage that the abrasion color fastness grade of the surface of the white coating is more than or equal to 4 grade due to the modification effect of materials such as wax powder, silicon dioxide and the like in the sealing layer.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein, 1, a base material; 2. a transition layer; 3. a bonding layer; 4. a reflective layer; 5. and (7) sealing the layer.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the attached drawings:

the invention discloses a white snow coating, which comprises a base material 1, a transition layer 2, a bonding layer 3, a reflecting layer 4 and a sealing layer 5 from inside to outside in sequence as shown in figure 1.

The substrate is a fabric, a metal or an organic composite material.

The transition layer is a water-based white coating and is prepared by forming a film by 25-45% of a film forming substance I, 20-50% of a white material I, 0.1-0.5% of an auxiliary agent I and water in percentage by mass; the thickness of the transition layer is not less than 10 μm.

The film forming material I is water-based acrylic acid or polyurethane; the white material I is a mixture of nano zirconia and magnesia, and the mass ratio of the nano zirconia to the magnesia is as follows: magnesium oxide (3-4): (1-0); the first auxiliary agent is 0.1-0.5% of dispersant, 0.1-0.5% of softening agent and the balance of water.

The bonding layer is prepared by curing and film-forming a second film-forming material 40-50%, a second auxiliary agent 5-10% and a second solvent 35-55% in percentage by mass; the bonding layer has a thickness of not more than 5 μm.

The film forming material II is oil-based polyurethane; the auxiliary agent II is an adhesion promoter or a tackifier; the solvent II is at least one of toluene, dimethylformamide and n-butyl acetate.

The reflecting layer is a white coating, and the coating is prepared by film forming of 30-50% of a film forming substance III, 30-45% of a white material III, 0.1-0.5% of an auxiliary agent III and a solvent III in percentage by mass; the thickness of the reflecting layer is not less than 10 μm.

The third film forming substance is at least one of polyurethane and acrylic acid; the white material III is at least one plastic particle or a mixture of plastic particles of nano zirconium oxide, barium sulfate and micron-sized PVC, PE and PVDF; the third auxiliary agent is 0.1-0.5% of dispersant and 0.1-0.5% of softener; and the third solvent is water.

The sealing layer is prepared by filming a film forming substance IV with the mass percentage of 40-50%, a pigment filler IV with the mass percentage of 10%, an auxiliary agent IV with the mass percentage of 0.2-0.5% and a solvent IV with the mass percentage of 40-50%.

The film forming material IV is at least one of vinyl chloride-vinyl acetate resin or ethylene-propylene resin; the pigment and filler IV is at least one of calcium sulfate, wax powder, silicon dioxide, fluorescent white and self-cleaning coating; the auxiliary agent IV is a dispersant; the solvent IV is at least one of toluene and dimethylformamide.

The invention also provides a preparation method of the white snow coating, which comprises the following steps:

s1: preparing a transition layer solution: according to the mass ratio of (25-45): (20-50): (0.1-0.5): (35-50) respectively weighing a film forming substance I, a white material I (nano zirconium oxide and magnesium oxide), an auxiliary agent I and water in a container, uniformly dispersing by using a high-speed dispersion machine to obtain a transition layer solution, and sealing for later use;

s2: preparing a bonding layer solution: according to the mass ratio (40-50): (5-10): (35-55) respectively weighing a film forming substance II, an auxiliary agent II and a solvent II in proportion into a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a bonding layer solution for later use;

s3: preparing a reflecting layer solution: according to the mass ratio (30-50): (30-45): (0.1-0.5): (30-40) respectively weighing a film forming substance III, a white material III, an auxiliary agent III and a solvent III in proportion in a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a reflecting layer solution for later use;

s4: preparing a sealing layer solution: according to the mass ratio (40-50): 10: (0.2-0.5): (40-50) respectively weighing a film forming substance IV, a white material IV, an auxiliary agent IV and a solvent IV in a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a sealing layer solution for later use;

s5: preparing a transition layer: directly coating the transition layer solution on the surface of a base material by using a scraper and a wire bar, then placing the base material coated with the solution in a drying oven for curing to form a film, controlling the temperature of the drying oven at 100-120 ℃, controlling the drying time at 1-2 min, and simultaneously controlling the thickness of the coating to be not less than 10 mu m;

s6: preparing a bonding layer: directly coating the bonding layer solution on the surface of the transition layer by using a scraper and a wire bar, and then placing the transition layer solution in an oven to be cured to form a film, wherein the temperature of the oven is controlled to be 80-100 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled not to exceed 5 mu m;

s7: preparing a reflecting layer: coating the reflecting layer solution on the surface of the bonding layer directly by using a scraper and a wire bar, and then placing the bonding layer solution in an oven to be cured into a film, wherein the temperature of the oven is controlled to be 100-120 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled to be not less than 10 mu m;

s8: preparing a sealing layer: and (3) directly coating the sealing layer solution on the surface of the reflecting layer by using a scraper and a wire bar, and then placing the reflecting layer solution in an oven to be cured into a film, wherein the temperature of the oven is controlled to be 80-100 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled not to exceed 5 mu m.

Example 1 to example 6:

the embodiment provides a white snow coating material, which comprises a base material, a transition layer, a bonding layer, a reflecting layer and a sealing layer; the transition layer, the bonding layer, the reflecting layer and the sealing layer are respectively a transition layer coating, a bonding layer coating, a reflecting layer coating and a sealing layer coating which are sequentially cured on the surface of the substrate to form a film; in this example, each type of coating was formulated according to the formulation in Table 1. (30-50): (30-45): (0.1-0.5): (30 to 40)

TABLE 1

The preparation method of the white snow coating in this example is as follows: in each example, the raw materials are weighed according to the types and proportions in table 1, and are mixed and uniformly dispersed to obtain four kinds of coatings, namely a transition layer coating, a bonding layer coating, a reflecting layer coating and a sealing layer coating; according to the preparation process from S5 to S8, the transition layer coating, the bonding layer coating, the reflecting layer coating and the sealing layer coating are sequentially coated on the surface of a base material and dried to form a film, so that the snow coating is obtained, and the curing temperatures of the four coatings are respectively as follows: curing time was 2min at 110 deg.C, 85 deg.C, 110 deg.C and 85 deg.C.

TABLE 2

And testing ultraviolet, visible light and artificial accelerated aging mechanics, friction resistance and antifouling performance of the prepared white snow coating material. The performance results are shown in Table 3.

TABLE 3

Comparative examples 1 to 4:

compared with the example 1, the transition layer, the bonding layer, the reflecting layer and the sealing layer are respectively removed from the comparative examples 1 to 4, and the proportion of the coating components, the thickness of each coating, the base material and the curing process are all the same as those in the example 1.

TABLE 4

And testing ultraviolet, visible light and artificial accelerated aging mechanics, friction resistance and antifouling performance of the prepared white snow coating material. The performance results are shown in Table 5.

TABLE 5

Comparative examples 5 to 10:

comparative examples 5 to 10 were prepared by changing the coating thicknesses of the transition layer, the adhesive layer, the reflective layer and the sealant layer, respectively, as compared with example 2, and the other coating composition ratios, the substrate and the curing process were the same as those of example 2.

TABLE 6

And testing ultraviolet, visible light and artificial accelerated aging mechanics, friction resistance and antifouling performance of the prepared white snow coating material. The performance results are shown in Table 7.

TABLE 7

Comparative examples 11 to 15:

comparative examples 11 to 15 changed the curing temperature and curing time of the transition layer, adhesive layer, reflective layer and sealing layer, respectively, as compared with example 3, and the others included the respective coating component ratios, substrates and thicknesses as in example 3.

TABLE 8

The prepared samples were observed for color and apparent quality. The appearance of each coating is shown in Table 9.

TABLE 9

Examples 1 to 6 show that: compared with the common snow material, the invention designs four functional coatings including the transition layer, the adhesion-promoting layer, the reflecting layer and the sealing layer with proper components and thicknesses, can realize the ultraviolet protection index of the snow coating by utilizing the interaction among the coatings, simultaneously optimizes the aging resistance, the friction resistance and the antifouling performance of the coatings, and improves the service performance of the snow material; comparative examples 1 to 10 show that when the material components are fixed, the performance of the snow material may be deteriorated when the four functional coatings are missing or the thickness of at least one coating is changed beyond a suitable range; comparative examples 11 to 15 cause yellowing and scorching of the four functional coatings of the snow material and deterioration of the apparent quality of the material by means of measures such as increasing the curing temperature and prolonging the curing time of the snow material. In conclusion, the following results show that: the white camouflage material meeting the requirements can be obtained by designing four functional coatings with reasonable components and thicknesses, such as a transition layer, an adhesion promoting layer, a reflecting layer, a sealing layer and the like, and by a proper curing process.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention. While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (9)

1. A white snow coating characterized by: the composite material sequentially comprises a base material, a transition layer, a bonding layer, a reflecting layer and a sealing layer from inside to outside;

the substrate is a fabric, a metal or an organic composite material;

the transition layer is a water-based white coating and is prepared by forming a film by 25-45% of a film forming substance I, 20-50% of a white material I, 0.1-0.5% of an auxiliary agent I and water;

the bonding layer is prepared by curing and film-forming a second film-forming material 40-50%, a second auxiliary agent 5-10% and a second solvent 35-55% in percentage by mass;

the reflecting layer is a white coating, and the coating is prepared by filming 30-50% of a filming substance III, 30-45% of a white material III, 0.1-0.5% of an auxiliary agent III and a solvent III in percentage by mass;

the sealing layer is prepared by filming 40-50% of film forming substance IV, 10% of pigment and filler IV, 0.2-0.5% of auxiliary agent IV and 40-50% of solvent IV by mass percentage.

2. A white snow coating according to claim 1, characterized in that: the thickness of the transition layer is not less than 10 μm.

3. A white snow coating according to claim 1, characterized in that: the film forming material I is water-based acrylic acid or polyurethane; the white material I is a mixture of nano zirconia and magnesia, and the mass ratio of the nano zirconia to the magnesia is as follows: magnesium oxide (3-4): (1-0); the first auxiliary agent comprises 0.1-0.5% of dispersant, 0.1-0.5% of softening agent and the balance of water.

4. A white snow coating according to claim 1, characterized in that: the bonding layer has a thickness of not more than 5 μm.

5. A white snow coating according to claim 1, characterized in that: the film forming material II is oil-based polyurethane; the auxiliary agent II is an adhesion promoter or a tackifier; the second solvent is at least one of toluene, dimethylformamide and n-butyl acetate.

6. A white snow coating according to claim 1, characterized in that: the thickness of the reflecting layer is not less than 10 μm.

7. A white snow coating according to claim 1, characterized in that: the film forming material III is at least one of polyurethane and acrylic acid; the white material III is at least one plastic particle or a mixture of plastic particles of nano zirconium oxide, barium sulfate and micron-sized PVC, PE and PVDF; the third auxiliary agent comprises 0.1-0.5% of dispersant and 0.1-0.5% of softener; and the third solvent is water.

8. A white snow coating according to claim 1, characterized in that: the film forming material IV is at least one of vinyl chloride-vinyl acetate resin or ethylene propylene resin; the pigment and filler IV is at least one of calcium sulfate, wax powder, silicon dioxide, fluorescent white and self-cleaning coating; the auxiliary agent IV is a dispersant; the solvent IV is at least one of toluene and dimethylformamide.

9. The method for preparing a white snow coating according to claim 1, characterized in that: the method comprises the following steps:

s1: preparing a transition layer solution: according to the mass ratio (25-45): (20-50): (0.1-0.5): (35-50) respectively weighing a film forming substance I, a white material I, an auxiliary agent I and water in proportion into a container, uniformly dispersing by using a high-speed dispersion machine to obtain a transition layer solution, and sealing for later use;

s2: preparing a bonding layer solution: according to the mass ratio (40-50): (5-10): (35-55) respectively weighing a film forming substance II, an auxiliary agent II and a solvent II in proportion into a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a bonding layer solution for later use;

s3: preparing a reflecting layer solution: according to the mass ratio (30-50): (30-45): (0.1-0.5): (30-40) respectively weighing a film forming substance III, a white material III, an auxiliary agent III and a solvent III in proportion in a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a reflecting layer solution for later use;

s4: preparing a sealing layer solution: according to the mass ratio (40-50): 10: (0.2-0.5): (40-50) respectively weighing a film forming substance IV, a white material IV, an auxiliary agent IV and a solvent IV in a container, and uniformly dispersing by using a high-speed dispersion machine to obtain a sealing layer solution for later use;

s5: preparing a transition layer: directly coating the transition layer solution on the surface of a base material by using a scraper and a wire bar, then placing the base material coated with the solution in an oven for curing to form a film, controlling the temperature of the oven at 100-120 ℃, controlling the drying time at 1-2 min, and simultaneously controlling the thickness of the coating to be not less than 10 mu m;

s6: preparing a bonding layer: directly coating the bonding layer solution on the surface of the transition layer by using a scraper and a wire bar, and then placing the transition layer solution in an oven to be cured to form a film, wherein the temperature of the oven is controlled to be 80-100 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled not to exceed 5 mu m;

s7: preparing a reflecting layer: coating the reflecting layer solution on the surface of the bonding layer directly by using a scraper and a wire bar, and then placing the bonding layer solution in an oven to be cured into a film, wherein the temperature of the oven is controlled to be 100-120 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled to be not less than 10 mu m;

s8: preparing a sealing layer: and (3) directly coating the sealing layer solution on the surface of the reflecting layer by using a scraper and a wire bar, and then placing the reflecting layer solution in an oven to be cured into a film, wherein the temperature of the oven is controlled to be 80-100 ℃, the drying time is controlled to be 1-2 min, and the thickness of the coating is controlled not to exceed 5 mu m.

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