Pigment-Type Ultraviolet Light Curable Coating For Window Film And Preparation Method Therefor

Abstract

The present invention relates to an UV coating special for PET window film and its preparation method. A pigmented UV-curable window-film coating comprising the following components in parts by mass: UV monomer: 3-40, modified acrylate: 10-50, photoinitiator: 1-10, leveling agent: 0.4-2, pigment: 3-20, coupling agent: 0.5-1.5 and dispersant: 0.4-0.8. The pigmented window film according to the present invention has the functions of being difficult to fade, UV resistance and excellent outdoor weather-resistance as well as the functions of surface-scratch resistance. The color or hue of the pigment itself can remain unchanged for several or even a dozen years. Thus, a PET window film produced from a pigment with good weather resistance can guarantee that it will keep its original color for several to a dozen years and its performance will not be influenced by outdoor environmental factors.

Claims

1. A pigmented UV-curable window-film coating comprising the following components in parts by mass: UV monomer 3-40 Modified polyacrylate 10-50 Photoinitiator 1-10 Leveling agent 0.4-2 Pigment 3-20 Coupling agent 0.5-1.5 Dispersant 0.4-0.8.

2. The pigmented UV-curable window-film coating according to claim 1, featured in that: it comprises the following components in parts by mass: Acrylate UV monomer 3-37 Modified polyurethane acrylate 27-45 Photoinitiator 1-8.5 Modified organosilicon leveling agent 0.4-1.5 Pigment 3.5-7 Silane coupling agent 0.5-1.5 Polymeric dispersant 0.4-0.8.

3. The pigmented UV-curable window-film coating according to claim 2, featured in that: said modified polyurethane acrylate is one or more selected from the aminemodified polyurethane acrylate, the epoxymodified polyurethane acrylate, the polyethermodified polyurethane acrylate and the unsaturated-epoxymodified polyurethane acrylate.

4. The pigmented UV-curable window-film coating according to claim 2, featured in that: said acrylate UV monomer comprises 1-4 parts by mass of acrylate monomers with mono functional group and 2-33 parts by mass of acrylate monomers with multiple functional groups, said acrylate monomer with mono functional group comprises one or more selected fromisooctyl acrylate, isobornyl methacrylate, phenoxyethyl acrylate and tetrahydrofurfuryl acrylate, said acrylate monomer with multiple functional groups comprises at least two selected from dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, phthalate diethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, dioxolane acrylate, alkoxylated bisphenol A dimethacrylate and ethylene glycol acrylate methylphosphonate.

5. The pigmented UV-curable window-film coating according to claim 2, featured in that: said photoinitiator is one or more selected from 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, ethyl 4-dimethylaminobenzoate, methyl-o-menzoylbenzoate, 4-phenylbenzophenone and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

6. The pigmented UV-curable window-film coating according to claim 2, featured in that: said modified organosilicon leveling agent is one or more selected from modified polysiloxane, polyether-polyester modified silicone emulsion and polydimethylsiloxane.

7. The pigmented UV-curable window-film coating according to claim 2, featured in that: said pigment is one or more selected from carbon black, aniline black, Permanent Yellow, Permanent Orange G, Permanent Orange RL, Everbright Bronze Red, Lithol Red, Pigment Red G, Phthalocyanine Blue, Indanthrone, Phthalocyanine Green, Quinacridone Violet and TiO.sub.2.

8. The pigmented UV-curable window-film coating according to claim 2, featured in that: said coupling agent is one or more selected from -aminopropyltriethoxysilane, 3-(2-aminoethyl)-aminopropyltriethoxysilane, N-phenyl--aminopropyltrimethoxysilane and 3-(2,3-epoxypropoxy) propylmethyldiethoxysilane.

9. The pigmented UV-curable window-film coating according to claim 2, featured in that: said polymeric dispersant is one or more selected from amino acid ester copolymer, polyester-type copolymer and polyolefin copolymer.

10. The method of preparing the window-film coating according to claim 2 comprising the following steps: Step 1. Put the pigment, acrylate UV monomer, polymeric dispersant, coupling agent and modified organosilicon leveling agent into a grinding miller to grind 1-3 hours and then filter to obtain the slurry, Step 2. Put the slurry obtained from Step 1 and the modified polyurethane acrylate into an agitated vessel to disperse 10-30 minutes, Step 3. Put the photoinitiator into the agitated vessel to mix 10-30 minutes to obtain said coating.

Description

DESCRIPTION OF THE EMBODIMENTS

[0028] In order to deepen the understanding to the present invention, the following embodiments are used to further describe the present invention in detail. Nevertheless, the following embodiments are just used to explain the present invention rather than constituting any limitation on the protection scope of the present invention.

Embodiment 1

[0029] This embodiment provides an UV-curable coating for protecting colored window-film that is prepared through the following preparation method:

[0030] Mix 33 parts by mass of acrylic ester monomer including dipropylene glycol diacrylate, 3 parts by mass of isobornyl methacrylate, 4 parts by mass of carbon black and 0.3 parts by mass of amino acid ester copolymer (Cognis P61), grind them for 180 minutes. Then filter to obtain the slurry. Place the slurry, 35 parts by mass of amine modified urethane acrylate, 4 parts by mass of 2-hydroxy-methylphenylpropan-1-one, 0.6 parts by mass of -aminopropyltriethoxysilane and 0.8 parts by mass of polyether modified silicone into an agitation vessel to agitate and mix to obtain a finished pigmented UV-curable coating for protecting window film.

[0031] The coating obtained according to the present invention will not fade after sunlight exposure with the premise of ensuring other performances.

Embodiment 2

[0032] This embodiment provides an UV-curable coating for protecting colored window-film that is prepared through the following preparation method:

[0033] Place 2 parts by mass of hydroxypropyl acrylate, 29 parts by mass of pentaerythritol triacrylate, 20 parts by mass of 2-butoxymethylethyl-1,3-propanediyl-2-acrylate and 8 parts by mass of carbon black as well as 0.6 parts by mass of high-molecular polymer (Elementis DP983) into a grinding vessel to grind for 180 minutes before filtering to obtain the slurry. Then place the slurry and 30 parts by mass of acrylic modified polyurethane (Jiangsu Sanmu SM-60217) into an agitation vessel to agitate for 30 minutes. Then place 0.05 parts by mass of polyether-polyester modified polysiloxane (TEGO 410) and -aminopropyltriethoxysilane (Jessica HK550) into the agitation vessel to agitate for 20 minutes. Finally, add 5 parts by mass of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide to agitate for 15 minutes and obtain the finished product of UV-curable coating for protecting colored window film.

[0034] The coating obtained according to the present invention will not fade after sunlight exposure with the premise of ensuring other performances.

Embodiment 3

[0035] This embodiment provides an UV-curable coating for protecting colored window-film that is prepared through the following preparation method:

[0036] Place 3 parts by mass of aliphatic urethane diacrylate, 27 parts by mass of isobornyl acrylate, 30 parts by mass of trimethylolpropane diacrylate, 6 parts by mass of carbon black, 3 parts by mass of PHTHALO BLUE, 0.8 parts by mass of high-molecular polymeric dispersant BYK-9076 into a grinding vessel to grind for 160 minutes before filtering to obtain the slurry. Then place the slurry and 27 parts by mass of fatty-acid modified epoxy diacrylate (Wuxing Chemical G522) into an agitation vessel to agitate for 30 minutes. Then place 0.05 parts by mass of polyether-polyester modified polysiloxane (TEGO 410) and -aminopropyltriethoxysilane (Jessica HKS50) into the agitation vessel to agitate for 20 minutes. Finally, add 5 parts by mass of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide to agitate for 15 minutes and obtain the finished product of UV-curable coating for protecting colored window film.

[0037] The coating obtained according to the present invention has a transmittance of 18% with a coating thickness of 3 m and will not fade after sunlight exposure with the premise of ensuring other performances.

Embodiment 4

[0038] This embodiment provides an UV-curable coating for protecting colored window-film that is prepared through the following preparation method:

[0039] Place 3 parts by mass of 1,4-cyclohexanedimethanol dimethacrylate, 28 parts by mass of ethoxylated dipentaerythritol hexaacrylate, 26 parts by mass of dodecyl methacrylate, 5 parts by mass of carbon black, 2 parts by mass of PHTHALO BLUE, 1 part by mass of Pigment Red 122, 0.9 parts by mass of high-molecular polymeric dispersant BYK-1790 into a grinding vessel to grind for 190 minutes before filtering to obtain the slurry. Then place the slurry and 30 parts by mass of fatty-acid modified epoxy diacrylate (Wuxing Chemical G522) into an agitation vessel to agitate for 30 minutes. Then place 0.05 parts by mass of polyether-polyester modified polysiloxane (TEGO 370) and -aminopropyltriethoxysilane (Jessica HK550) into the agitation vessel to agitate for 20 minutes. Finally, add 5 parts by mass of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide to agitate for 15 minutes and obtain the finished product of UV-curable coating for protecting colored window-film.

[0040] The coating obtained according to the present invention has a transmittance of 44% with a coating thickness of 3 m and will not fade after sunlight exposure with the premise of ensuring other performances.

Embodiment 5

[0041] This embodiment provides an UV-curable coating for protecting colored window-film that is prepared through the following preparation method:

[0042] Mix 20 parts by mass of 2-phenoxyethyl methacrylate, 10 parts by mass of isobornyl methacrylate, 9 parts by mass of carbon black and 0.3 parts by mass of amino acid ester copolymer (Cognis P61), grind them for 230 minutes. Then filter to obtain the slurry. Place the slurry, 32 parts by mass of amine modified urethane acrylate, 1 part by mass of 2-hydroxy-methylphenylpropan-1-one, 0.6 parts by mass of -aminopropyltriethoxysilane and 0.8 parts by mass of polyether modified silicone into an agitation vessel to agitate and mix to obtain a finished pigmented UV-curable coating for protecting window film.

[0043] The coating obtained according to the present invention has a measured haze value of 1.7% when the coating thickness is 2 m, meeting the requirement of 2% by the window-film industry. Meanwhile, it will not fade after sunlight exposure with the premise of ensuring other performances.

[0044] Dilute the UV coating solution compounded as above to a solid content of 25-40% and the diluting solvents include butyl ester, butanone and isopropanol, etc. Coat the diluted UV coating solution on a PET film through roller coating. After a process of baking for 2 minutes in the oven to remove the organic solvent, cure the coating under UV lamp and then conduct the following processes including taking up. The hardened window-film product needs to be subject to a series of functional tests. The detailed test methods are as follows.

[0045] Hardness test: Coat the protecting colored window-films provided in Embodiments 1-2 with the UV-curable coating. Then measure their hardness with a pencil hardness tester. The results show that the hardness of the window films in Embodiment 1 and Embodiment 2 both amounts to 3H, meeting the requirement on window-film hardness.

[0046] Transmittance test: as per the method specified by GB2410-80. Conduct the test with LS105A Transmittance tester by Linshang Technology. The transmittance of visible light of the coating by Embodiment 1 is 40% and that by Embodiment 2 is 1.9%, meeting the current requirement on the transmittance of car window-film.

[0047] Haze test: Conduct the test as per GB2410-80. The haze of the window films prepared with the coatings by Embodiment 1 and 2 is respectively 1.7% and 1.8%, meeting the quality criterion of <2% required by the current window-film standard.

[0048] Weather-resistance test: Conduct the test as per GB/T 29365-2012. Either of the weather resistance of the window films prepared with the coatings by Embodiment 1 and 2 achieves over 10 years, meeting the current requirement of window films.

TABLE-US-00003 Embodiment 1 Embodiment 2 Parts by Parts by Component mass Component mass UV monomer Dipropylene glycol diacrylate 33 Pentaerythritol triacrylate 29 Isobornyl methacrylate 3 2-butoxymethylethyl-1,3-propanediyl-2-acrylate 20 Hydroxypropyl acrylate 2 Oligomer Amine modified urethane acrylate 35 Acrylic modified polyurethane (Jiangsu Sanmu 30 SM-60217) Photoinitiator 2-hydroxy-methylphenylpropan-1-one 4 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 5 Leveling agent Polyether modified organicsilicon 0.8 Polyether-polyester modified polysiloxane (TEGO 410) 0.05 Coupling agent -aminopropyltriethoxysilane 0.6 Aminopropyltriethoxysilane (Jessica HK550) Dispersant Amino acid ester copolymer (Cognis 0.3 High-molecular polymer (Elementis DP983) 0.6 P61) Pigment Carbon black 4 Carbon black 8 Embodiment 3 Parts by Component mass UV monomer Trimethylolpropane diacrylate 30 Isobornyl acrylate 27 Aliphatic polyamide diacrylate 3 Oligomer Fatty-acid modified epoxy diacrylate (Wuxing 27 Chemical G522) Photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 5 Leveling agent Polyether-polyester modified polysiloxane 0.05 (TEGO 410) Coupling agent -aminopropyltriethoxysilane (Jessica HK550) Dispersant Polymeric dispersant BYK-9076 0.8 Pigment Carbon black 6 Embodiment 4 Embodiment 5 Parts by Parts by Component mass Component mass UV Ethoxylated dipentaerythritol hexaacrylate 28 2-phenoxyethyl methacrylate 20 Dodecyl methacrylate 26 Isobornyl methacrylate 10 1,4-cyclohexanedimethanol dimethacrylate 3 Oligomer Fatty-acid modified epoxy diacrylate (Wuxing 30 Amine modified urethane 32 Chemical G522) acrylate Photoinitiator 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 5 2-hydroxy-methylphenylpropan- 1 1-one Leveling Polyether-polyester modified polysiloxane (TEGO 0.05 Polyether modified 0.8 agent 410) organicsilicon Coupling -aminopropyltriethoxysilane (Jessica HK550) -aminopropyltriethoxysilane 0.6 Dispersant Polymeric dispersant BYK-9076 0.9 Amino acid ester copolymer 0.3 (CognisP61) Pigment Carbon black 5 Carbon black 9 PHTHALO BLUE 2 Pigment Red 122 1

[0049] The following are the test data of the five embodiments:

TABLE-US-00004 Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Color Black Black Navy Tawny Super-transparent Window-film 750 g/>3H 750 g/3H 750 g/3H 750 g/3H 750 g/>3H surface hardness Transmittance of 40% 19% 18% 44% 30% visible light Haze of window 1.9% 1.97% 1.68 1.87 1.7 film Weather-resistance >10 >10 >10 >10 >10 years of window film

[0050] It can be seen from the test results above that after the scratch-resistant coatings provided by Embodiment 1-5 according to the present invention are coated on the surfaces of the window films and top-grade of protective films, they not only can achieve a high hardness, but also exert a relatively high transmittance. Thus, this demonstrates that the scratch-resistant coating according to the present invention is an UV-curable coating for protecting colored window film that can be prepared into a scratch-resistant coating characteristic in appropriate hardness and good light transmission.