Peelable protective coating and application

Abstract

The invention is suitable for the technical field of protective coatings, and provides a peelable protective coating and application thereof. The strippable protective coating is prepared from the following components in parts by weight: 20 to 50 parts of polyurethane, 1.5 to 5.5 parts of polytetrafluoroethylene, 1 to 4 parts of dioctyl phthalate, 2 to 3 parts of nano titanium dioxide, 0.7 to 1.3 parts of ultraviolet light absorber, 1 to 2 parts of tetraamino phthalocyanine, 3 to 6 parts of tetrahydroxy zinc porphyrin-metal oxide, 2.2 to 5.4 parts of inorganic filler, 0.3 to 0.6 part of surfactant and 0.2 to 0.7 part of antioxidant; preferably, the tetrahydroxy zinc porphyrin-metal oxide is one or more of tetrahydroxy zinc porphyrin-ZnO, tetrahydroxy zinc porphyrin-NiO and tetrahydroxy zinc porphyrin-CuO, and the tetrahydroxy zinc porphyrin-metal oxide is one or more of tetrahydroxy zinc porphyrin-ZnO, tetrahydroxy zinc porphyrin-NiO and tetrahydroxy zinc porphyrin-CuO. The mass ratio of the tetraamino phthalocyanine to the tetrahydroxy zinc porphyrin-metal oxide is 1: 3. The prepared protective coating has excellent mechanical properties and is easy to peel off, and no substance is left on the surface of a base material after the whole protective coating is peeled off.

Description

Technical Field

[0001] The invention relates to the technical field of protective coatings, in particular to a strippable protective coating and its application. Background Art

[0002] The surfaces of mobile phones, computers, cars, plastic parts, glass, etc. are generally coated with a layer of protective coating. The protective coating can not only improve the durability and service life of the surface items, but also improve the user experience to a certain extent. For example, anti-fingerprint, anti-reflective, hydrophobic and other coatings are often used in consumer electronic products, while anti-ultraviolet and impact-resistant coatings are more used in the fields of automotive glass and plastic parts. The use of these coatings makes mobile phones, computers, cars, plastic parts, glass and other daily contact equipment and items more beautiful, durable and practical.

[0003] Most of the protective coatings currently on the market are added with some stripping aids such as silicone or wax emulsion. Although they are easy to strip, they will remain on the surface of the substrate, affecting the post-processing of the substrate, thereby reducing the use effect of the protective coating and increasing the cost of subsequent product cleaning and maintenance. Summary of the invention

[0004] The purpose of the present invention is to provide a peelable protective coating and its application, so as to solve the problem that most of the protective coatings on the market in the prior art are added with some stripping agents such as silicone or wax emulsion, which will remain on the surface of the substrate after stripping, affecting the post-processing of the substrate and reducing the use effect of the protective coating.

[0005] To achieve the above object, the present invention provides the following technical solution: In a first aspect, the present invention provides a peelable protective coating, which comprises the following components by weight:

[0006] 20-50 parts of polyurethane, 1.5-5.5 parts of polytetrafluoroethylene, 1-4 parts of dioctyl phthalate, 2-3 parts of nano titanium dioxide, 0.7-1.3 parts of ultraviolet absorber, 1-2 parts of tetraaminophthalocyanine, 3-6 parts of tetrahydroxyzinc porphyrin-metal oxide, 2.2-5.4 parts of inorganic filler, 0.3-0.6 parts of surfactant and 0.2-0.7 parts of antioxidant.

[0007] Preferably, the strippable protective coating further comprises nano clay, nano alumina and nano zirconia, with the mass fractions thereof being 0.2 to 0.4 parts, 0.6 to 1.2 parts and 0.3 to 0.6 parts respectively.

[0008] Preferably, the tetrahydroxyzinc porphyrin-metal oxide is one or more of tetrahydroxyzinc porphyrin-ZnO, tetrahydroxyzinc porphyrin-NiO and tetrahydroxyzinc porphyrin-CuO.

[0009] Preferably, the mass ratio of the tetraaminophthalocyanine to the tetrahydroxyzinc porphyrin-metal oxide is 1:3.

[0010] Preferably, the ultraviolet absorber is one or more of UV-327, UV-329, and UV-320.

[0011] Preferably, the inorganic filler is one of talcum powder, aluminum phosphate and glass fiber.

[0012] Preferably, the antioxidant is one or more of BHT, Irganox 1010, and Jayflex 10.

[0013] Preferably, the surfactant is a silicone surfactant or an alkylbenzene sulfonate surfactant.

[0014] Preferably, the preparation method of the tetrahydroxyzinc porphyrin-metal oxide is as follows:

[0015] Tetrahydroxyzinc porphyrin and metal oxide are mixed in a molar ratio of 1:3-4, and a proper amount of ethanol is added to dissolve, reflux reaction is carried out for 2-3 hours, rotary evaporation is performed, and drying is performed to obtain tetrahydroxyzinc porphyrin-metal oxide.

[0016] The second aspect of the present invention provides an application of the peelable protective coating described in the first aspect of the present invention, and the application fields of the peelable protective coating include but are not limited to mobile phone computer films, car covers, plastic surface protective films and glass protective films.

[0017] The present invention has at least the following beneficial effects:

[0018] The present invention provides a peelable protective coating and its application. The prepared protective coating has excellent mechanical properties and is easy to peel off. After the overall peeling, no substance will remain on the surface of the substrate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only 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.

[0020] Example 1

[0021] This embodiment provides a peelable protective coating, which includes the following components in parts by mass:

[0022] 20 parts of polyurethane, 1.5 parts of polytetrafluoroethylene, 1 part of dioctyl phthalate, 2 parts of nano titanium dioxide, 0.7 parts of ultraviolet absorber, 1 part of tetraaminophthalocyanine, 3 parts of tetrahydroxyzinc porphyrin-metal oxide, 2.2 parts of inorganic filler, 0.3 parts of surfactant and 0.2 parts of antioxidant.

[0023] Wherein, the mass ratio of tetraaminophthalocyanine to tetrahydroxyzinc porphyrin-metal oxide is 1:3.

[0024] Wherein, the tetrahydroxy zinc porphyrin-metal oxide is tetrahydroxy zinc porphyrin-ZnO; the preparation method of tetrahydroxy zinc porphyrin-ZnO is as follows:

[0025] Tetrahydroxyzinc porphyrin and ZnO were mixed in a molar ratio of 1:3, and an appropriate amount of ethanol was added to dissolve, refluxed for 2 hours, rotary evaporated, and dried to obtain tetrahydroxyzinc porphyrin-ZnO.

[0026] Among them, the ultraviolet absorber is UV-327; the inorganic filler is talcum powder; the antioxidant is BHT; and the surfactant is a silicone surfactant.

[0027] Example 2

[0028] This embodiment provides a peelable protective coating, which includes the following components in parts by mass:

[0029] 40 parts of polyurethane, 4.5 parts of polytetrafluoroethylene, 3.4 parts of dioctyl phthalate, 2.7 parts of nano titanium dioxide, 1.1 parts of ultraviolet absorber, 1.8 parts of tetraaminophthalocyanine, 5.4 parts of tetrahydroxyzinc porphyrin-metal oxide, 3.9 parts of inorganic filler, 0.4 parts of surfactant and 0.6 parts of antioxidant.

[0030] Wherein, the mass ratio of tetraaminophthalocyanine to tetrahydroxyzinc porphyrin-metal oxide is 1:3.

[0031] Wherein, the tetrahydroxy zinc porphyrin-metal oxide is tetrahydroxy zinc porphyrin-NiO; the preparation method of the tetrahydroxy zinc porphyrin-metal oxide is as follows:

[0032] Tetrahydroxyzinc porphyrin and NiO were mixed at a molar ratio of 1:3.5, and an appropriate amount of ethanol was added to dissolve the mixture. The mixture was refluxed for 2.5 hours, rotary evaporated, and dried to obtain tetrahydroxyzinc porphyrin-NiO.

[0033] The ultraviolet absorber is UV-329; the inorganic filler is aluminum phosphate; the antioxidant is Irganox1010; and the surfactant is an alkylbenzene sulfonate surfactant.

[0034] Example 3

[0035] This embodiment provides a peelable protective coating, which includes the following components in parts by mass:

[0036] 50 parts of polyurethane, 5.5 parts of polytetrafluoroethylene, 4 parts of dioctyl phthalate, 3 parts of nano titanium dioxide, 1.3 parts of ultraviolet absorber, 2 parts of tetraaminophthalocyanine, 6 parts of tetrahydroxyzinc porphyrin-metal oxide, 5.4 parts of inorganic filler, 0.6 parts of surfactant and 0.7 parts of antioxidant.

[0037] Wherein, the mass ratio of tetraaminophthalocyanine to tetrahydroxyzinc porphyrin-metal oxide is 1:3.

[0038] Wherein, the tetrahydroxyzinc porphyrin-metal oxide is tetrahydroxyzinc porphyrin-CuO; the preparation method of the tetrahydroxyzinc porphyrin-metal oxide is as follows:

[0039] Tetrahydroxyzinc porphyrin and CuO were mixed in a molar ratio of 1:4, and an appropriate amount of ethanol was added to dissolve, refluxed for 3 hours, rotary evaporated, and dried to obtain tetrahydroxyzinc porphyrin-CuO.

[0040] Among them, the ultraviolet absorber is UV-320; the inorganic filler is glass fiber; the antioxidant is Jayflex10; and the surfactant is a silicone surfactant.

[0041] Example 4

[0042] This embodiment provides a peelable protective coating, which includes the following components in parts by mass:

[0043] 20 parts of polyurethane, 1.5 parts of polytetrafluoroethylene, 1 part of dioctyl phthalate, 2 parts of nano titanium dioxide, 0.7 parts of ultraviolet absorber, 1 part of tetraaminophthalocyanine, 3 parts of tetrahydroxyzinc porphyrin-metal oxide, 2.2 parts of inorganic filler, 0.3 parts of surfactant, 0.2 parts of antioxidant, 0.2 parts of nano clay, 0.6 parts of nano alumina and 0.3 parts of nano zirconium oxide.

[0044] The rest is the same as in Example 1.

[0045] Example 5

[0046] This embodiment provides a peelable protective coating, which includes the following components in parts by mass:

[0047] 40 parts of polyurethane, 4.5 parts of polytetrafluoroethylene, 3.4 parts of dioctyl phthalate, 2.7 parts of nano titanium dioxide, 1.1 parts of ultraviolet absorber, 1.8 parts of tetraaminophthalocyanine, 5.4 parts of tetrahydroxyzinc porphyrin-metal oxide, 3.9 parts of inorganic filler, 0.4 parts of surfactant, 0.6 parts of antioxidant, 0.3 parts of nano clay, 0.8 parts of nano alumina and 0.5 parts of nano zirconium oxide.

[0048] The rest is the same as Example 2.

[0049] Example 6

[0050] This embodiment provides a peelable protective coating, which includes the following components in parts by mass:

[0051] 50 parts of polyurethane, 5.5 parts of polytetrafluoroethylene, 4 parts of dioctyl phthalate, 3 parts of nano titanium dioxide, 1.3 parts of ultraviolet absorber, 2 parts of tetraaminophthalocyanine, 6 parts of tetrahydroxyzinc porphyrin-metal oxide, 5.4 parts of inorganic filler, 0.6 parts of surfactant, 0.7 parts of antioxidant, 0.4 parts of nano clay, 1.2 parts of nano alumina and 0.6 parts of nano zirconium oxide.

[0052] The rest is the same as in Example 3.

[0053] The functions of each component in the present invention are as follows:

[0054] Polyurethane is the main film-forming substance, which gives the coating good adhesion and flexibility; polytetrafluoroethylene provides a low friction coefficient and enhances the scratch resistance of the coating; dioctyl phthalate is used as a plasticizer to improve the flexibility and weather resistance of the coating; nano titanium dioxide is used as a UV shielding agent to improve the weather resistance and anti-aging ability of the coating; UV absorbers further enhance the coating's protection against UV rays; tetraaminophthalocyanine and tetrahydroxyzinc porphyrin-metal oxide are used as light stabilizers to improve the light resistance and chemical resistance of the coating; inorganic fillers increase the mechanical strength and wear resistance of the coating; surfactants improve the coating's coating properties; antioxidants extend the service life of the coating.

[0055] In addition, the polyurethane film in the present invention has a lower surface energy, which helps to reduce adhesion and enhance peelability; polytetrafluoroethylene has an extremely low surface energy and can reduce the adhesion of the polyurethane film; dioctyl phthalate can make the film surface softer and reduce the adhesion of the adhesive, thereby achieving easier peeling.

[0056] Through the synergy of various components, the prepared peelable protective coating not only has excellent protective performance, but also can be easily peeled off after use without causing damage to the substrate, which greatly improves the use value of the product and the convenience of post-processing.

[0057] A series of performance tests were conducted on the products obtained in Examples 1-6 above, and the results are as follows:

[0058]

[0059]

[0060] In summary, the product prepared by the present invention has good mechanical properties, is easy to peel off, and has no residue. It can be used as mobile phone films, computer films, car covers, plastic surface protection films, glass protection films, etc., and has great application prospects.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A peelable protective coating, characterized in that: The strippable protective coating comprises the following components in parts by mass: 20-50 parts of polyurethane, 1.5-5.5 parts of polytetrafluoroethylene, 1-4 parts of dioctyl phthalate, 2-3 parts of nano titanium dioxide, 0.7-1.3 parts of ultraviolet absorber, 1-2 parts of tetraaminophthalocyanine, 3-6 parts of tetrahydroxyzinc porphyrin-metal oxide, 2.2-5.4 parts of inorganic filler, 0.3-0.6 parts of surfactant and 0.2-0.7 parts of antioxidant.

2. A peelable protective coating according to claim 1, characterized in that: The strippable protective coating also includes nano clay, nano alumina and nano zirconium oxide, and the weight proportions thereof are 0.2 to 0.4 parts, 0.6 to 1.2 parts and 0.3 to 0.6 parts respectively.

3. A peelable protective coating according to claim 1, characterized in that: The tetrahydroxyzinc porphyrin-metal oxide is one or more of tetrahydroxyzinc porphyrin-ZnO, tetrahydroxyzinc porphyrin-NiO and tetrahydroxyzinc porphyrin-CuO.

4. A strippable protective coating according to claim 1, characterized in that: The mass ratio of the tetraaminophthalocyanine to the tetrahydroxyzinc porphyrin-metal oxide is 1:

3.

5. The strippable protective coating according to claim 1, characterized in that: The ultraviolet absorber is one or more of UV-327, UV-329 and UV-320.

6. A strippable protective coating according to claim 1, characterized in that: The inorganic filler is one of talcum powder, aluminum phosphate and glass fiber.

7. The strippable protective coating according to claim 1, characterized in that: The antioxidant is one or more of BHT, Irganox 1010, and Jayflex 10.

8. The strippable protective coating according to claim 1, characterized in that: The surfactant is one of an organic silicon surfactant and an alkylbenzene sulfonate surfactant.

9. The strippable protective coating according to claim 1, characterized in that: The preparation method of the tetrahydroxy zinc porphyrin-metal oxide is as follows: Tetrahydroxyzinc porphyrin and metal oxide are mixed in a molar ratio of 1:3-4, and a proper amount of ethanol is added to dissolve, reflux reaction is carried out for 2-3 hours, rotary evaporation is performed, and drying is performed to obtain tetrahydroxyzinc porphyrin-metal oxide.

10. A use of the strippable protective coating according to any one of claims 1 to 9, characterized in that: The application fields of the strippable protective coating include but are not limited to mobile phone computer films, car covers, plastic surface protective films and glass protective films.

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