CN118006214A - Hydrophobic Mini LED display screen surface packaging coating and Mini LED display screen - Google Patents

Abstract

The invention relates to the technical field of coatings, in particular to a hydrophobic Mini LED display screen surface packaging coating, which comprises the following components in parts by weight: 35-50 parts of synthetic resin, 10-25 parts of modifier, 15-20 parts of diluent monomer, 1-2 parts of initiator, 3-5 parts of filler, 1-2 parts of defoamer and 1-2 parts of antioxidant; the modifier is a fluororesin modifier or a silicone oil modifier; the silicone oil modifier is synthesized by hydroxyl silicone oil, isocyanate and acrylic ester. The hydroxyl silicone oil is at least one of monohydroxy dimethyl silicone oil and dihydroxy dimethyl silicone oil; the isocyanate is at least one of TDI, MDI, HDI, IPDI and isocyanate trimer; the acrylic ester is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate. The surface packaging coating for the hydrophobic Mini LED display screen has good durability and can maintain the hydrophobic effect for a long time. The invention also provides a Mini LED display screen, which is coated with the hydrophobic Mini LED display screen surface packaging coating.

Description

A hydrophobic Mini LED display screen surface encapsulation coating and Mini LED display screen

Technical Field

The present invention relates to the field of coating technology, and in particular to a hydrophobic Mini LED display screen surface encapsulation coating and a Mini LED display screen.

Background technique

Generally speaking, Mini LED displays usually use sprayed AF (Anti-Fingerprints) coating to achieve hydrophobicity. However, the general AF coating manufacturing process is complicated, the retention time of the hydrophobicity is relatively short, and it is easily worn.

The preparation of traditional AF coatings requires multiple steps, including surface cleaning, coating deposition, drying, etc. Such a complex process limits its mass production and application scope. At the same time, due to the influence of the external environment and usage conditions, the hydrophobic function of ordinary AF coatings has a limited retention time and may gradually weaken within a few months. In addition, due to external forces such as friction and scratching, wear and scratches may appear on the surface of the coating, thereby reducing the effect of the hydrophobic function. The above defects are what those skilled in the art expect to overcome.

Summary of the invention

The purpose of the present invention is to overcome the above-mentioned defects in the prior art. In a first aspect, the present invention provides a hydrophobic Mini LED display surface encapsulation coating;

Based on the first aspect of the present invention, the second aspect of the present invention further provides a Mini LED display screen;

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A hydrophobic Mini LED display surface encapsulation coating, comprising the following components in parts by weight:

Furthermore, the modifier is a fluororesin modifier or a silicone oil modifier; wherein the silicone oil modifier is synthesized from hydroxy silicone oil, isocyanate and acrylate.

Preferably, it includes at least one of the following features (1) to (3):

(1) The hydroxy silicone oil is at least one of monohydroxy dimethyl silicone oil and dihydroxy dimethyl silicone oil;

(2) the isocyanate is at least one of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) and isocyanate trimer;

(3) The acrylic acid ester is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

Preferably, the molecular weight of the monohydroxydimethyl silicone oil and the dihydroxydimethyl silicone oil is 200-2000.

Preferably, the toluene diisocyanate (TDI) is at least one of TDI100, TDI80 and TDI65.

Preferably, the isocyanate trimer includes at least one of toluene diisocyanate (TDI) trimer, diphenylmethane diisocyanate (MDI) trimer, hexamethylene diisocyanate (HDI) trimer, and isophorone diisocyanate (IPDI).

Furthermore, the invention comprises at least one of the following features (1) to (6):

(1) The synthetic resin is any one of epoxy resin, propionic acid resin, polyurethane resin, polyvinyl acetate resin, polyvinyl alcohol resin, urea formaldehyde resin, phenolic resin, and silicone resin;

(2) The diluent monomer is at least one of pentaerythritol triacrylate (PETA), 1,6-hexanediol diacrylate (HDDA), tricyclodecane dimethanol diacrylate (DCPDA), and tetrahydrofuran acrylate (THFA);

(3) the initiator is at least one of photoinitiator 1173, photoinitiator 184, photoinitiator 907, photoinitiator 369, and photoinitiator 379;

(4) The filler is modified silica;

(5) The defoamer is at least one of TEGO270, TEGO370, TEGO2700, and defoamer 920;

(6) The antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, antioxidant 1010, and antioxidant 292.

Preferably, the modified silica is epoxy-modified silica, and the particle size of the epoxy-modified silica is 0.5 μm to 50 μm.

A second aspect of the present invention provides a Mini LED display screen, the surface of which is coated with a hydrophobic Mini LED display screen surface encapsulation coating as described above.

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

1. A hydrophobic Mini LED display surface encapsulation coating of the present invention includes a photoinitiator, which can achieve rapid prototyping by UV curing and is easy to make. The hydrophobic Mini LED display surface encapsulation coating has good chemical stability, thermal stability and moisture resistance, and also has the advantages of wear resistance and scratch resistance. The hydrophobic function of the hydrophobic Mini LED display surface encapsulation coating is retained for a long time and has good durability.

2. A Mini LED display screen of the present invention has its surface coated with the above-mentioned hydrophobic Mini LED display screen surface encapsulation coating. The Mini LED display screen has the advantages of wide application range, long service life, good anti-fouling performance, and easy cleaning and maintenance.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

The present invention provides a hydrophobic Mini LED display screen surface encapsulation coating, which includes the following components in parts by weight: 35 to 50 parts of synthetic resin, 10 to 25 parts of modifier, 15 to 20 parts of diluent monomer, 1 to 2 parts of initiator, 3 to 5 parts of filler, 1 to 2 parts of defoamer, and 1 to 2 parts of antioxidant.

The synthetic resin may be specifically but not limited to 35 parts, 40 parts, 45 parts, or 50 parts; the synthetic resin is selected from any one of epoxy resin, propionic resin, polyurethane resin, polyvinyl acetate resin, polyvinyl alcohol resin, urea formaldehyde resin, phenolic resin, and silicone resin.

The modifier may be, but is not limited to, 10 parts, 15 parts, 20 parts, or 25 parts; the modifier is selected from a fluororesin modifier or a silicone oil modifier. The silicone oil modifier is synthesized from hydroxy silicone oil, isocyanate, and acrylate.

Specifically, the hydroxy silicone oil is selected from at least one of monohydroxy dimethyl silicone oil and dihydroxy dimethyl silicone oil. Preferably, the molecular weight of monohydroxy dimethyl silicone oil and dihydroxy dimethyl silicone oil is 200-2000. Isocyanate is selected from at least one of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) and isocyanate trimer; wherein, toluene diisocyanate (TDI) is selected from at least one of TDI100, TDI80 and TDI65. Isocyanate trimer is selected from at least one of toluene diisocyanate (TDI) trimer, diphenylmethane diisocyanate (MDI) trimer, hexamethylene diisocyanate (HDI) trimer and isophorone diisocyanate (IPDI). Acrylate is selected from at least one of hydroxyethyl acrylate and hydroxypropyl acrylate.

The diluent monomer may be, but is not limited to, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, or 20 parts; the diluent monomer is selected from at least one of pentaerythritol triacrylate (PETA), 1,6-hexanediol diacrylate (HDDA), tricyclodecane dimethanol diacrylate (DCPDA), and tetrahydrofuran acrylate (THFA).

The initiator may be, but is not limited to, 1 part, 1.5 parts, or 2 parts; the initiator is selected from at least one of photoinitiator 1173, photoinitiator 184, photoinitiator 907, photoinitiator 369, and photoinitiator 379.

The filler may be, but is not limited to, 3 parts, 4 parts, or 5 parts; the filler is modified silica. Preferably, the modified silica is epoxy-modified silica, and the particle size of the epoxy-modified silica is 0.5 μm to 50 μm. The particle size of the epoxy-modified silica may be, but is not limited to, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, or 50 μm.

The defoaming agent may be, but is not limited to, 1 part, 1.5 parts, or 2 parts; the defoaming agent is selected from at least one of TEGO270, TEGO370, TEGO2700, and defoaming agent 920.

The specific amount of the antioxidant may be, but is not limited to, 1 part, 1.5 parts, or 2 parts; the antioxidant is selected from at least one of 2,6-di-tert-butyl-p-cresol, antioxidant 1010, and antioxidant 292.

The present invention also provides a Mini LED display screen, the surface of which is coated with the above-mentioned hydrophobic Mini LED display screen surface encapsulation coating. The Mini LED display screen has good anti-fouling performance, long service life, and is easy to clean and maintain.

In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

Example 1

(1) Preparation of silicone oil modifier PDMS-PMMA

① Weigh 45.1045 g of toluene diisocyanate, 0.2013 g of dibutyltin dilaurate and 0.2102 g of 2,6-di-tert-butyl-p-cresol, and put the above raw materials into a four-necked flask; put the four-necked flask into a magnetic oil bath, set the temperature of the magnetic oil bath to 60°C, put a magnet in the four-necked flask, and stir the above raw materials evenly.

② Weigh 54.0012g of monohydroxydimethyl silicone oil into a dropping funnel, then use the dropping funnel to drop the monohydroxydimethyl silicone oil into the four-necked bottle and react at 60°C for 2h;

③ Then, the temperature was lowered to 40°C, and hydroxyethyl acrylate was added dropwise into the four-necked flask using a dropping funnel and kept warm for 1 hour to obtain the silicone oil modifier PDMS-PMMA.

(2) Preparation of the hydrophobic Mini LED display surface encapsulation coating

Weigh 35.5021g of polyurethane acrylate, 25.0128g of silicone oil modifier PDMS-PMMA prepared in step (1), 13.0042g of 1,6-hexanediol diacrylate (HDDA), 9.1487g of tetrahydrofuran acrylate (THFA), 2.1428g of photoinitiator 1173, 2.2141g of antioxidant 292, 1.0259g of defoamer 920, and 3.5254g of epoxy-modified silica, and oscillate with an oscillator for 10 minutes to obtain a hydrophobic Mini LED display surface encapsulation coating. Among them, polyurethane acrylate uses Covestro u-25-20d.

(3) The hydrophobic Mini LED display surface encapsulation coating obtained in step (2) is transferred to a PET optical film by UV to obtain a PET optical film with a hydrophobic coating.

Example 2

(1) Preparation of silicone oil modifier PDMS-PMMA

① Weigh 45.1045 g of toluene diisocyanate, 0.2013 g of dibutyltin dilaurate and 0.2102 g of 2,6-di-tert-butyl-p-cresol, and put the above raw materials into a four-necked flask; put the four-necked flask into a magnetic oil bath, set the temperature of the magnetic oil bath to 60°C, put a magnet in the four-necked flask, and stir the above raw materials evenly.

② Weigh 54.0012g of monohydroxydimethyl silicone oil into a dropping funnel, then use the dropping funnel to drop the monohydroxydimethyl silicone oil into the four-necked bottle and react at 60°C for 2h;

③ Then, the temperature was lowered to 40°C, and hydroxyethyl acrylate was added dropwise into the four-necked flask using a dropping funnel and kept warm for 1 hour to obtain the silicone oil modifier PDMS-PMMA.

(2) Preparation of the hydrophobic Mini LED display surface encapsulation coating

Weigh 50.5321g of polyurethane acrylate, 10.0154g of silicone oil modifier PDMS-PMMA prepared in step (1), 13.1524g of 1,6-hexanediol diacrylate (HDDA), 9.2035g of tetrahydrofuran acrylate (THFA), 2.1021g of photoinitiator 1173, 2.0142g of antioxidant 292, 1.1249g of defoamer 920, and 3.5124g of epoxy-modified silica, and oscillate with an oscillator for 10 minutes to obtain a hydrophobic Mini LED display surface encapsulation coating. Among them, polyurethane acrylate uses Covestro u-25-20d.

(3) The hydrophobic Mini LED display surface encapsulation coating obtained in step (2) is transferred to a PET optical film by UV to obtain a PET optical film with a hydrophobic coating.

Product performance testing

The PET optical films with hydrophobic coatings obtained in the above-mentioned Examples 1 and 2 were tested for performance, and the specific method is as follows:

(1) Contact angle test before baking: measured according to the method of GB/T 30693-2014;

(2) Contact angle test before baking: Take the PET optical films with hydrophobic coatings obtained in Example 1 and Example 2, respectively, place them at 150° C. and bake them, and then measure the contact angle according to the method of GB/T 30693-2014;

(3) Contact angle test after immersion in alcohol: Take the PET optical films with hydrophobic coatings obtained in Example 1 and Example 2, soak them in alcohol for 18 hours respectively, and measure the contact angle according to the method of GB/T 30693-2014;

(4) Contact angle test after high temperature and high humidity: The PET optical films with hydrophobic coatings obtained in Example 1 and Example 2 were placed in an environment with a temperature of 110° C. and a humidity of 100% for 32 hours, and then measured according to the method of GB/T30693-2014.

(5) Abrasion resistance test: The PET optical films with hydrophobic coatings obtained in Example 1 and Example 2 were subjected to a 100-grid test and a hardness test. In the 100-grid test, the PET optical films with hydrophobic coatings obtained in Example 1 and Example 2 both reached 5B; in the hardness test, the test results of the PET optical films with hydrophobic coatings obtained in Example 1 and Example 2 were 2H to 3H.

The specific test results are shown in Table 1:

Table 1 Performance test results

When the contact angle is less than 90°, the surface is considered hydrophilic; when the contact angle is ≥90°, the surface is considered hydrophobic; the larger the contact angle, the more hydrophobic the surface is.

It can be seen from Table 1 that, firstly, the contact angle test results of the PET optical film with a hydrophobic coating obtained in Example 1 and Example 2 before baking are both greater than 110°, and the hydrophobic performance is good; when the PET optical film with a hydrophobic coating obtained in Example 1 and Example 2 is baked at 150°C, the contact angle test results are also greater than 110°, and the contact angle is increased as a whole compared to that before baking. It can be seen that the hydrophobic Mini LED display surface encapsulation coating can still have good hydrophobicity after heat treatment.

Secondly, after the PET optical films with hydrophobic coatings obtained in Example 1 and Example 2 were immersed in alcohol for 18 hours, the contact angle test results of the PET optical film with hydrophobic coating obtained in Example 1 were all greater than 110°, and the contact angle test results of the PET optical film with hydrophobic coating obtained in Example 2 were 90° to 115°. It can be seen that the hydrophobic Mini LED display surface encapsulation coating prepared in Example 1 still maintains good hydrophobic properties after long-term alcohol immersion, and has good chemical stability and durability. The hydrophobic Mini LED display surface encapsulation coating prepared in Example 2 still has hydrophobic properties after long-term alcohol immersion, but the hydrophobic performance is not as good as the hydrophobic Mini LED display surface encapsulation coating prepared in Example 1.

Again, when the PET optical films with hydrophobic coatings obtained in Examples 1 and 2 were placed in an environment with a temperature of 110°C and a humidity of 100% for 32 hours, the contact angle test results of the PET optical film with hydrophobic coating obtained in Example 1 were mostly 90° to 105°, and the contact angle test results of the PET optical film with hydrophobic coating obtained in Example 2 were 90° to 100°. The contact angle test results of the PET optical film with hydrophobic coating obtained in Example 1 were generally larger than the contact angle test results of the PET optical film with hydrophobic coating obtained in Example 2. It can be seen that the hydrophobic MiniLED display surface encapsulation coating prepared in Example 1 has good thermal stability, moisture resistance and durability.

In summary, the hydrophobic Mini LED display surface encapsulation coating provided by the present invention includes a photoinitiator, which can achieve rapid prototyping by UV curing and is simple to manufacture. The hydrophobic Mini LED display surface encapsulation coating has good chemical stability, thermal stability, moisture resistance and durability, and also has the advantages of wear resistance and scratch resistance. In addition, within a certain range, increasing the content of the silicone oil modifier in the hydrophobic Mini LED display surface encapsulation coating can correspondingly improve the chemical stability, thermal stability, moisture resistance and durability of the hydrophobic Mini LED display surface encapsulation coating.

The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims (9)

1. A hydrophobic Mini LED display screen surface encapsulation coating, characterized in that it comprises the following components in parts by weight: 2. A hydrophobic Mini LED display surface encapsulation coating according to claim 1, characterized in that the modifier is a fluororesin modifier or a silicone oil modifier; wherein the silicone oil modifier is synthesized using hydroxy silicone oil, isocyanate, and acrylate. 3. The hydrophobic Mini LED display surface encapsulation coating according to claim 2, characterized in that it comprises at least one of the following features (1) to (3): (1) The hydroxy silicone oil is at least one of monohydroxy dimethyl silicone oil and dihydroxy dimethyl silicone oil; (2) the isocyanate is at least one of toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI) and isocyanate trimer; (3) The acrylic acid ester is at least one of hydroxyethyl acrylate and hydroxypropyl acrylate. 4. A hydrophobic Mini LED display surface encapsulation coating according to claim 3, characterized in that the molecular weight of the monohydroxydimethyl silicone oil and the dihydroxydimethyl silicone oil is 200 to 2000. 5. A hydrophobic Mini LED display surface encapsulation coating according to claim 3, characterized in that the toluene diisocyanate (TDI) is at least one of TDI100, TDI80, and TDI65. 6. A hydrophobic Mini LED display surface encapsulation coating according to claim 3, characterized in that the isocyanate trimer includes at least one of toluene diisocyanate (TDI) trimer, diphenylmethane diisocyanate (MDI) trimer, hexamethylene diisocyanate (HDI) trimer, and isophorone diisocyanate (IPDI). 7. The hydrophobic Mini LED display surface encapsulation coating according to claim 1, characterized in that it comprises at least one of the following features (1) to (6): (1) The synthetic resin is any one of epoxy resin, propionic acid resin, polyurethane resin, polyvinyl acetate resin, polyvinyl alcohol resin, urea formaldehyde resin, phenolic resin, and silicone resin; (2) The diluent monomer is at least one of pentaerythritol triacrylate (PETA), 1,6-hexanediol diacrylate (HDDA), tricyclodecane dimethanol diacrylate (DCPDA), and tetrahydrofuran acrylate (THFA); (3) the initiator is at least one of photoinitiator 1173, photoinitiator 184, photoinitiator 907, photoinitiator 369, and photoinitiator 379; (4) The filler is modified silica; (5) The defoamer is at least one of TEGO270, TEGO370, TEGO2700, and defoamer 920; (6) The antioxidant is at least one of 2,6-di-tert-butyl-p-cresol, antioxidant 1010, and antioxidant 292. 8. A hydrophobic Mini LED display surface encapsulation coating according to claim 7, characterized in that the modified silica is epoxy-modified silica, and the particle size of the epoxy-modified silica is 0.5 μm to 50 μm. 9. A Mini LED display screen, characterized in that the surface of the Mini LED display screen is coated with a hydrophobic Mini LED display screen surface encapsulation coating as described in any one of claims 1 to 8.