1. A fluorescent transparent varnish composition, characterized in that the varnish composition comprises A, B components;

the component A comprises the following components in percentage by weight based on the total weight of the component A: 1-20% of 1,1' -bi-2-naphthol, 10-50% of hydroxyl acrylic resin, 0-5% of other auxiliary agents and the balance of organic solvent A;

the component B comprises the following components in percentage by weight based on the total weight of the component B: 1-100% of isocyanate curing agent and the balance of organic solvent B.

2. The fluorescent transparent varnish composition according to claim 1, wherein the mixing ratio of the A-component and the B-component is 1:99 to 99: 1.

3. The fluorescent clear varnish composition according to claim 1, wherein the 1,1 '-bi-2-naphthol is a levorotatory, dextrorotatory or racemic 1,1' -bi-2-naphthol.

4. The fluorescent transparent varnish composition according to claim 1, wherein the hydroxy acrylic resin is a solvent-type acrylic resin having a hydroxyl group content of 1-4.0%.

5. The fluorescent transparent varnish composition according to claim 1, wherein the other auxiliary agents comprise one or a combination of several of dispersing agents, defoaming agents, wetting agents, thickening agents, drying agents, leveling agents and UV auxiliary agents.

6. The fluorescent transparent varnish composition according to claim 1, wherein the organic solvent A is selected from one or a combination of aromatic hydrocarbon solvents, alkane solvents, ether solvents, ketone solvents and ester solvents.

7. The fluorescent transparent varnish composition according to claim 1, wherein the isocyanate curing agent is one or a mixture of HDI trimer and IPDI trimer.

8. The fluorescent transparent varnish composition according to claim 1, wherein the organic solvent B is selected from one or a combination of aromatic hydrocarbon solvents, alkane solvents, ketone solvents, ester solvents and ether solvents.

9. A fluorescent transparent clear varnish coating, wherein the coating is sprayed on a paint or substrate from a composition according to any one of claims 1 to 8.

10. The fluorescent transparent varnish coating of claim 9, wherein the fluorescent transparent varnish sprayed on the paint or substrate is cured to a complete film by natural drying or thermal curing at 80 ℃.

Background

Fluorescent coatings are currently on the market by means of the addition of fluorescent pigments, in particular inorganic fluorescent pigments. However, the inorganic fluorescent filler has high density, coarse particle size and easy precipitation. The coating is troublesome to construct and poor in appearance.

Through the search of the prior patent literature, CN109796369A discloses a 1,1' -bi-2-naphthol derivative and the application thereof as a fluorescent dye of a water-based paint; the application carries out chemical modification on 1,1' -bi-2-naphthol derivatives (BINOL), and the BINOL with dialdehyde group reacts with aromatic diamine derivatives to obtain the BINOL derivatives with novel structures and solid fluorescence, which can be used as fluorescent dyes of water-based coatings. However, this product can only be added as an additional fluorescent pigment. The addition of the additive to the coating can affect the film forming property and appearance of the product, so that the addition amount of the additive cannot be too much. The invention uses the binaphthol and the hydroxy acrylic acid to mix and react with the isocyanate, so that the using amount of the binaphthol is not limited. After the coating is cured, the appearance is very good.

Disclosure of Invention

Aiming at the limitation of the existing fluorescent paint, the invention aims to provide a fluorescent transparent varnish and a preparation method thereof; after the coating is cured, a paint film becomes fluorescent under ultraviolet irradiation; the fluorescent transparent varnish does not need to be added with fluorescent pigment, and has low viscosity, good appearance and convenient construction.

The purpose of the invention is realized by the following technical scheme:

the invention relates to a fluorescent transparent varnish composition, which comprises A, B components;

the component A comprises the following components in percentage by weight based on the total weight of the component A: 1-20% of 1,1' -bi-2-naphthol, 10-50% of hydroxyl acrylic resin, 0-5% of other auxiliary agents and the balance of organic solvent A;

the component B comprises the following components in percentage by weight based on the total weight of the component B: 1-100% of isocyanate curing agent and the balance of organic solvent B.

As an embodiment of the present invention, the mixing ratio of the A-component and the B-component is 1:99 to 99: 1. The specific mixing ratio is preferably 1 to 1.3 in terms of NCO equivalent of the isocyanate curing agent of the B component/hydroxyl equivalent of the A component.

As an embodiment of the present invention, 1,1' -bi-2-naphthol may be either levorotatory, dextrorotatory or racemic. 1,1' -bi-2-naphthol, also known as binaphthol, has a unique stereochemistry. It has two naphthalene rings which fluoresce under ultraviolet irradiation. The two naphthalene rings in the structure have large volume, large steric hindrance and rigidity. The two naphthalene rings have certain rotation capacity and certain flexibility. The structure is as follows:

the film forming mechanism of the finish paint curing is that 1,1' -bi-2-naphthol, acrylic resin and isocyanate curing agent in the component B react as follows;

the mass percentage of the 1,1' -bi-2-naphthol in the component A is 1-20%, and the better selection is 10-15%.

As one embodiment of the present invention, the hydroxy acrylic resin is a weather resistant solvent type acrylic resin having a hydroxyl group content of between 1 and 4.0%. The mass ratio of the component A is 10-50%, preferably 30-40%.

As an embodiment of the present invention, the other auxiliary agent may include one or a combination of several of a dispersant, a defoamer, a wetting agent, a thickener, a drier, a UV auxiliary agent, and a leveling agent. The mass ratio of the component A is 0-5%, preferably 1-3%.

As an embodiment of the invention, the organic solvent A is selected from one or a combination of several of aromatic hydrocarbon solvent, alkane solvent, ether solvent, ketone solvent and ester solvent.

As an embodiment of the present invention, the isocyanate curing agent may be HDI trimer, IPDI trimer or a mixture thereof. The mass ratio of the component B is 1-100%, and preferably 40-60%.

As an embodiment of the invention, the organic solvent B is selected from one or a combination of several of aromatic hydrocarbon solvent, alkane solvent, ether solvent, ketone solvent and ester solvent.

As one embodiment of the present invention, the fluorescent transparent varnish may be sprayed onto a paint or substrate.

The invention also relates to a fluorescent transparent varnish coating which is sprayed on a paint or a substrate from the composition.

As one embodiment of the present invention, the fluorescent transparent varnish sprayed on the paint or substrate is cured into a film by natural drying or thermal curing at 80 ℃. Natural drying time is 3 hours to longer; the heat curing time is 30 minutes or more.

Compared with the prior art, the invention has the following beneficial effects:

1) the invention develops a preparation method of a fluorescent transparent varnish, which avoids using inorganic fluorescent pigment and has no storage stability risk.

2) The invention develops a preparation method of a fluorescent transparent varnish, and the varnish has low viscosity, good leveling property and appearance, and simple and convenient construction.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

The invention relates to a synthetic method of fluorescent transparent varnish.

The following examples illustrate the manner in which the invention may be employed;

also, in each example, preparation of a fluorescent transparent varnish: the components of the fluorescent transparent varnish are physically mixed and then uniformly mixed in a high-speed dispersion mode. I.e., for performance testing.

Preparation of test panels: unless otherwise indicated, the test panel was an a4 tinplate. And (4) degreasing and cleaning the test plate by using a degreasing agent, and drying for later use. And coating the fluorescent transparent varnish on the pretreated test board in an air spraying manner. After curing, the relevant properties were tested. The adhesion test was performed according to GB/T9286-1998 standard. The ultraviolet light is selected to be UV340 irradiation.

Example 1

The embodiment relates to a fluorescent transparent varnish and a preparation method thereof, and the composition and the mass amount of the varnish are as follows in table 1:

TABLE 1

Remarking:¹purchased from national medicine group

²Hydroxyl acrylic resin with hydroxyl content of 3.1 percent of Hamins corporation

^3,4，5Purchase from China petrochemical Shell

⁶Rheological aid from Pick company

⁷Leveling agent of Picker company

⁸UV protection auxiliary from Basff

⁹IPDI trimer isocyanate curing agent from Corcisco

The A, B components are mixed, sprayed on a substrate, and completely cured into a film by heat curing at 80 ℃ for 30 minutes.

The results of the performance tests are shown in table 2 below:

TABLE 2

Example 2

The embodiment relates to a fluorescent transparent varnish and a preparation method thereof, and the composition and the mass amount of the varnish are as follows in table 3:

TABLE 3

¹⁰Solvent-based hydroxy acrylic resin with hydroxyl content of 1.3 percent for Zhanxin company

¹¹HDI trimer isocyanate curing agent of Corcission corporation

The A, B components are mixed, sprayed on a substrate, and completely cured into a film by heat curing at 80 ℃ for 30 minutes.

The performance test results are shown in table 5:

TABLE 4

In conclusion, the fluorescent transparent varnish has the advantages of simple preparation, convenient construction and good operability.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.