Coating for transparent polycarbonate plate as well as preparation and application of coating

Abstract

The invention discloses and provides a coating for a transparent polycarbonate plate. The coating is prepared by the following steps: fully and uniformly mixing 5-20 parts of monofunctional acrylate, 30-60 parts of polyfunctional acrylate, 0-20 parts of polyfunctional polyurethane acrylate and 0-20 parts of polyfunctional acryloyloxy polysiloxane, carrying out vacuum degassing to obtain the coating, and coating the surface of the transparent polycarbonate plate with the coating in a flow manner, the coating is obtained through curing under UV irradiation, the surface hardness of the organic transparent plate can be improved, the organic transparent plate can be protected against the effects of oxygen and other harmful ingredients in air, the use performance of the material is improved, and the service life is prolonged. Therefore, the transparent polycarbonate plate has the protection performance of a common polycarbonate plate when being hit from the outside, and personnel in the cabin are protected from being injured; and when escape is needed in case of emergency, the hammer is easy to damage to escape when hammering from the inner surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of fine chemical coating materials and applications, and particularly relates to a coating for transparent polycarbonate sheets, and its preparation and use methods. Background Art

[0002] Organic transparent sheets have good optical properties, mechanical properties, and low density, and are widely used as structural materials for transparent parts of airplanes, vehicles, ships, etc. However, organic transparent sheets are easily scratched during use, affecting the observation effect and service life. Generally, polycarbonate sheets and their molded parts are difficult to be damaged by external objects hitting, so they have good safety protection for cabin personnel, but this also brings the problem of difficult escape. Once an emergency occurs and window breaking for escape is needed, it is very difficult to break from the inside, blocking the internal window breaking and escape channel. Therefore, many small airplanes often choose organic glass with poor safety protection performance when designing and selecting materials. Although its safety performance as a windshield is far inferior to that of polycarbonate sheets, it can be broken from the inside for escape.

[0003] The purpose of the present invention is to develop a polycarbonate sheet with different impact resistance on both the inner and outer sides. When hit from the outside, it has the protection performance of ordinary polycarbonate sheets to protect cabin personnel from harm; and once an emergency occurs and escape is needed, it can be easily hammered and broken for escape like ordinary organic glass. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to develop a scratch-resistant coating, which can not only improve the surface hardness of organic transparent sheets, but also protect the organic transparent sheets from the action of oxygen and other harmful components in the air, improve the use performance of the material, and extend the service life. By weight, it is composed of the following components:

[0005]

[0006] Further, the monofunctional acrylate is at least one of methyl acrylate, ethyl acrylate, butyl acrylate, poly(methyl acrylate), poly(ethyl acrylate), and poly(butyl acrylate).

[0007] Further, the multifunctional acrylate is at least one of diethylene glycol diacrylate, polyethylene glycol diacrylate, 1,6 - hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, pentaerythritol tetraacrylate, and ethoxylated pentaerythritol tetraacrylate.

[0008] Further, the multifunctional polyurethane acrylate is one or more of difunctional polyester-based polyurethane acrylate (molecular weight 500 - 1000) and trifunctional polyester-based polyurethane acrylate (molecular weight 500 - 1000).

[0009] Further, the polyacryloyloxy-modified polysiloxane is a polysiloxane containing 2 or 3 acryloyloxy groups (molecular weight 500 - 800).

[0010] The present invention also provides a preparation method of a coating for transparent polycarbonate sheets. Prepare materials according to the above-mentioned formula, and mix the monofunctional acrylate, multifunctional acrylate, multifunctional polyurethane acrylate, and polyacryloyloxy-modified polysiloxane thoroughly and then degas under vacuum to obtain the coating.

[0011] The present invention also provides an application of the coating for transparent polycarbonate sheets. Flow the coating on the surface of the transparent polycarbonate sheet and cure it under UV irradiation.

[0012] Beneficial effects

[0013] The purpose of the present invention is to develop a scratch-resistant coating, which can not only improve the surface hardness of organic transparent sheets, but also protect the organic transparent sheets from the action of oxygen and other harmful components in the air, improve the service performance of the material, and extend the service life. Thus, when the transparent polycarbonate sheet is struck from the outside, it has the protective performance of an ordinary polycarbonate sheet, protecting the personnel in the cabin from harm; and once an emergency occurs and escape is needed, it is easy to break and escape when hammered from the inside. Specific embodiments

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0015] Example 1:

[0016] 10 parts of methyl acrylate, 40 parts of trimethylolpropane triacrylate, and 5 parts of difunctional polyester-based polyurethane acrylate (molecular weight 600 - 800) are thoroughly mixed and then degassed under vacuum to obtain the coating. Flow the coating on the surface of a 3-mm-thick transparent polycarbonate sheet, level it, and cure it under UV to obtain a coating.

[0017] Wipe the surface back and forth 10 times with 000# steel wool, and there are no scratch marks.

[0018] Test the impact strength according to GB / T 1043, and the results are as follows:

[0019] When impacting from the non-coated side to the coated side: The specimen broke, and the impact strength result was 17 kJ / m 2

[0020] When impacting from the coated side to the non-coated side: The specimen was not damaged.

[0021] Example 2:

[0022] 5 parts of butyl acrylate, 50 parts of diethylene glycol diacrylate, and 2 parts of dipropenoyloxypolysiloxane were fully mixed and then degassed under vacuum to obtain the coating. The coating was flow-coated on the surface of a 3-mm-thick transparent polycarbonate sheet, and after leveling, it was UV-cured to obtain the coating.

[0023] When the surface was wiped back and forth 10 times with 000# steel wool, there were no scratch marks.

[0024] The impact strength was tested according to GB / T 1043, and the results were as follows:

[0025] When impacting from the non-coated side to the coated side: The specimen broke, and the impact strength result was 16 kJ / m 2

[0026] When impacting from the coated side to the non-coated side: The specimen was not damaged.

[0027] The present disclosure has been described by the above related embodiments. However, the above embodiments are only examples for implementing the present disclosure. It must be pointed out that the disclosed embodiments do not limit the scope of the present disclosure. On the contrary, changes and modifications made without departing from the spirit and scope of the present disclosure fall within the scope of patent protection of the present disclosure.

Claims

1. A coating for transparent polycarbonate sheets, characterized in that: Composed of the following components by weight parts:

2. The coating for transparent polycarbonate sheets according to claim 1, characterized in that: The monofunctional acrylate is at least one of methyl acrylate, ethyl acrylate, butyl acrylate, polymethyl acrylate, polyethyl acrylate, and polybutyl acrylate.

3. The coating for transparent polycarbonate sheets according to claim 1, characterized in that: The multifunctional acrylate is at least one of diethylene glycol diacrylate, polyethylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, pentaerythritol tetraacrylate, and ethoxylated pentaerythritol tetraacrylate.

4. The coating for transparent polycarbonate sheet according to claim 1, characterized in that: The multifunctional polyurethane acrylate is one or more of a difunctional polyester-type polyurethane acrylate with a molecular weight of 500 to 1000 and a trifunctional polyester-type polyurethane acrylate with a molecular weight of 500 to 1000.

5. The coating for transparent polycarbonate sheets according to claim 1, characterized in that: The multifunctional acryloyloxy-modified polysiloxane is one or more of a polysiloxane containing 2 acryloyloxy groups with a molecular weight of 500 to 800 and a polysiloxane containing 3 acryloyloxy groups with a molecular weight of 500 to 800.

6. A preparation method of a coating for a transparent polycarbonate sheet according to any one of claims 1-5, characterized in that, Including the following steps: Prepare materials according to the formula, and the coating can be obtained by fully mixing the monofunctional acrylate, multifunctional acrylate, multifunctional polyurethane acrylate, and multifunctional acryloyloxy-modified polysiloxane and then performing vacuum degassing.

7. An application of the coating for the transparent polycarbonate sheet as described in claims 1-5, characterized in that, The application is to flow coat on the surface of a transparent polycarbonate sheet and cure under UV irradiation.

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