Thermal bending-free photocuring curved screen protective paster

Abstract

The disclosure provides a thermal bending-free photocuring curved screen protective paster which comprises a first protective film, an OCA glue layer, a main functional layer, a PET film layer, a surface functional layer and a second protective film sequentially arranged from bottom to top. The protective paster of the disclosure can be well attached to a curved screen and the like, and avoids the phenomena of warping, forming failure, springback and the like occurring after the traditional protective film is attached. The protective paster of the disclosure has good wear resistance, good anti-scraping effect, good transparency, good temperature resistance and stable structure, which can be prepared into a film with any angle, can be firmly attached to a curved screen with a large radian, and can effectively protect the curved screen.

Claims

1. A thermal bending-free photocuring curved screen protective paster, comprising a first protective film, an OCA glue layer, a main functional layer, a PET film layer, a surface functional layer and a second protective film sequentially arranged from bottom to top; wherein the main functional layer comprises a thermosetting acrylic resin, isocyanate, a defoaming agent, a leveling agent and a thickening agent.

2. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein a mass of the isocyanate accounts for 3-45% of a mass of the thermosetting acrylic resin; a mass of the defoaming agent accounts for 0.01-3% of the mass of the thermosetting acrylic resin; a mass of the leveling agent accounts for 0.05-3.5% of the mass of the thermosetting acrylic resin; and a mass of the thickening agent accounts for 0.4-1.5% of the mass of the thermosetting acrylic resin.

3. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein the thermosetting acrylic resin has a hydroxyl value of 20-150 mgKOH/g.

4. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein a light transmittance of the main functional layer is ≥90%.

5. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein the surface functional layer comprises a hardened layer composed of acrylic resin or a surface functional layer composed of polyurethane resin.

6. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein a thickness of the main functional layer is 25-250 μm; a thickness of the OCA glue layer is 5-100 μm; a thickness of the surface functional layer is 2-10 μm; a thickness of the PET film layer is 25-150 μm; a thickness of the first protective film is 25-150 μm; and a thickness of the second protective film is 25-150 μm.

7. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein a peel strength of the first protective film is 0.1-1 N/m; and a peel strength of the second protective film is 0.3-5 N/m.

8. The thermal bending-free photocuring curved screen protective paster according to claim 1, wherein the first protective film is an acrylic protective film and the second protective film is a silica gel protective film.

Description

DETAILED DESCRIPTION OF THE DISCLOSURE

(1) The thermal bending-free photocuring curved screen protective paster of the present disclosure is further described below with reference to embodiments:

Embodiment 1

(2) In the embodiment, the structure of the thermal bending-free photocuring curved screen protective paster sequentially comprises a first protective film, an OCA glue layer, a main functional layer, a PET resin hardened film layer, a surface functional layer and a second protective film from bottom to top. The layers are overlapped according to the structure to obtain the thermal bending-free photocuring curved screen protective paster, and a target product can be prepared through processes of die cutting, laminating, curing and the like. The first protective film is an acrylic protective film, and the second protective film is a silica gel protective film. The thickness of each film is shown in Table 1.

(3) The main functional layer comprises a thermosetting acrylic resin, isocyanate, polyoxyethylene polyoxypropanol amine ether defoaming agent, 1073 leveling agent from MONENG Chemical co. LTD and methyl hydroxyethyl cellulose thickening agent. A mass of the isocyanate accounts for 25% of the mass of the thermosetting acrylic resin; a mass of the defoaming agent accounts for 1% of the mass of the thermosetting acrylic resin; a mass of the leveling agent accounts for 0.8% of the mass of the thermosetting acrylic resin; and a mass of the thickening agent accounts for 1.2% of the mass of the thermosetting acrylic resin. The thermosetting acrylic resin has a hydroxyl value of 60 mgKOH/g. The light transmittance of the main functional layer is ≥92%. The surface functional layer includes a hardened layer composed of acrylic resin. The peel strength of the first protective film is 0.5 N/m; and the peel strength of the second protective film is 1.5 N/m.

(4) TABLE-US-00001 TABLE 1 material layers from thickness/ thickness/ thickness/ thickness/ bottom to top μm μm μm μm first protective film 50 50 50 50 OCA glue layer 30 10 15 25 main functional layer 25 60 90 120 PET resin hardened 30 38 50 75 film layer surface functional  3  3  3 3 layer second protective 50 50 50 50 film springback no no no no springback springback springback springback firmness of firm firm firm firm attachment

(5) Thermal cycle test is performed on the obtained thermal bending-free photocuring curved screen protective paster to observe the springback condition of the arc edge, wherein the thermal cycle test conditions are as follows: −20-90° C., temperature changing rate being 10° C./min, test time being 72 h; and the influence of springback on the firmness of attachment of the protective paster is tested. The results show that the obtained thermal bending-free photocuring curved screen protective pasters are all firmly attached to the curved screen with ultra-large bending angle, have no springback, and have good performance.

Embodiment 2

(6) In the embodiment, the structure of the thermal bending-free photocuring curved screen protective paster sequentially comprises a first protective film, an OCA glue layer, a main functional layer, a PET resin hardened film layer, a surface functional layer and a second protective film from bottom to top. The layers are overlapped according to the structure to obtain the thermal bending-free photocuring curved screen protective paster, and a target product can be prepared through processes of die cutting, laminating, curing and the like. The first protective film is an acrylic protective film, and the second protective film is a silica gel protective film. The thickness of each film is shown in Table 2.

(7) The main functional layer comprises a thermosetting acrylic resin, isocyanate, polyoxypropylene glycerol ether defoaming agent, 1074 leveling agent from MONENG Chemical co. LTD and hydroxyethyl cellulose thickening agent. A mass of the isocyanate accounts for 3% of the mass of the thermosetting acrylic resin; a mass of the defoaming agent accounts for 0.01% of the mass of the thermosetting acrylic resin; a mass of the leveling agent accounts for 0.05% of the mass of the thermosetting acrylic resin; and a mass of the thickening agent accounts for 0.4% of the mass of the thermosetting acrylic resin. The thermosetting acrylic resin has a hydroxyl value of 20 mgKOH/g. The light transmittance of the main functional layer is ≥92%. The surface functional layer includes a surface functional layer composed of polyurethane resin. The peel strength of the first protective film is 0.1 N/m; and the peel strength of the second protective film is 0.3 N/m.

(8) TABLE-US-00002 TABLE 2 material layers from thickness/ thickness/ thickness/ thickness/ bottom to top μm μm μm μm first protective film 50 50 50 50 OCA glue layer 30 10 15 25 main functional layer 25 60 90 120 PET resin hardened 30 38 50 75 film layer surface functional  3  3  3 3 layer second protective 50 50 50 50 film springback no no no no springback springback springback springback firmness of firm firm firm firm attachment

(9) Thermal cycle test is performed on the obtained thermal bending-free photocuring curved screen protective paster to observe the springback condition of the arc edge, wherein the thermal cycle test conditions are as follows: −20-90° C., temperature changing rate being 10° C./min, test time being 72 h; and the influence of springback on the firmness of attachment of the protective paster is tested. The results show that the obtained thermal bending-free photocuring curved screen protective pasters are all firmly attached to the curved screen with ultra-large bending angle, have no springback, and have good performance.

Embodiment 3

(10) In the embodiment, the structure of the thermal bending-free photocuring curved screen protective paster sequentially comprises a first protective film, an OCA glue layer, a main functional layer, a PET resin hardened film layer, a surface functional layer and a second protective film from bottom to top. The layers are overlapped according to the structure to obtain the thermal bending-free photocuring curved screen protective paster, and a target product can be prepared through processes of die cutting, laminating, curing and the like. The first protective film is an acrylic protective film, and the second protective film is a silica gel protective film. The thickness of each film is shown in Table 3.

(11) The main functional layer comprises a thermosetting acrylic resin, isocyanate, polyoxypropylene glycerol ether defoaming agent, 1074 leveling agent from MONENG Chemical co. LTD and polyurethane thickening agent. A mass of the isocyanate accounts for 45% of the mass of the thermosetting acrylic resin; a mass of the defoaming agent accounts for 3% of the mass of the thermosetting acrylic resin; a mass of the leveling agent accounts for 3.5% of the mass of the thermosetting acrylic resin; and a mass of the thickening agent accounts for 1.5% of the mass of the thermosetting acrylic resin. The thermosetting acrylic resin has a hydroxyl value of 150 mgKOH/g. The light transmittance of the main functional layer is ≥92%. The surface functional layer includes a hardened layer composed of an acrylic resin. The peel strength of the first protective film is 1 N/m; the peel strength of the second protective film is 5 N/m.

(12) TABLE-US-00003 TABLE 3 material layers from thickness/ thickness/ thickness/ thickness/ bottom to top μm μm μm μm first protective film 50 50 50 50 OCA glue layer 30 10 15 25 main functional layer 25 60 90 120 PET resin hardened 30 38 50 75 film layer surface functional  3  3  3 3 layer second protective 50 50 50 50 film springback no no no no springback springback springback springback firmness of firm firm firm firm attachment

(13) Thermal cycle test is performed on the obtained thermal bending-free photocuring curved screen protective paster to observe the springback condition of the arc edge, wherein the thermal cycle test conditions are as follows: −20-90° C., temperature changing rate being 10° C./min, test time being 72 h; and the influence of springback on the firmness of attachment of the protective paster is tested. The results show that the obtained thermal bending-free photocuring curved screen protective pasters are all firmly attached to the curved screen with ultra-large bending angle, have no springback, and have good performance.

(14) It will be appreciated by those skilled in the art that modifications and variations can be made in light of the above teachings without departing from the protection scope of the disclosure as set forth in the appended claims.