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Method for evaluating weatherability of fluorinated coating film

An evaluation method and weather resistance technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems of slow deterioration of test pieces and long time for weather resistance evaluation.

Inactive Publication Date: 2017-02-15
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The inventive method allows for quick accurate assessment on how well it's resistant against rain or snow without having to wait too long before making any changes needed again. This makes production faster than traditional methods that require multiple steps like sanding off excess water from an object after being painted with paint.

Problems solved by technology

This patents describes methods used during assessment of weathability or durableness of coatings applied onto materials like paints containing acrylic polymers. These tests involve subjecting them to different environmental conditions under specific circumstances until they become too damaged before testing their properties again. Additionally, these techniques can be extended into other areas where rain streaks may occur due to factors like temperature differences between indoor and outdoors environments.

Method used

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  • Method for evaluating weatherability of fluorinated coating film

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Embodiment

[0091] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

example 1、2 and 4～6

[0142] Using a high-speed mixer (manufactured by Yuzaki Co., Ltd.), the components described in Table 1 were mixed in the stated parts by mass for about 10 to 30 minutes to obtain a powdery mixture. This mixture was melt-kneaded at a cylinder set temperature of 120° C. using a twin-screw extruder (manufactured by ThermoPrism Ltd., 16 mm extruder) to obtain powder pellets. Next, the obtained particles were pulverized at room temperature using a pulverizer (manufactured by FRITSCH, rotor speed mill P14), and classified with a 150-mesh sieve to obtain a powder coating having an average particle diameter (50% average volume particle size distribution) of about 40 μm. .

[0143] Using an electrostatic coating machine (manufactured by Onoda Cement Co., Ltd., GX3600C), the obtained powder paint was electrostatically coated on a chromated aluminum plate (length x width 75 mm x 150 mm, thickness 1 mm). On one side, it was kept in an atmosphere at 200° C. for 20 minutes. Thereafter, i...

example 3

[0145] (Manufacture of acrylic resin (D1))

[0146]200 mL of deionized water, 2 g of a reactive emulsifier (manufactured by Sanyo Chemical Industry Co., Ltd., ELEMINOL (trade name) JS-2, a succinate derivative) were introduced into a four-neck flask with an inner capacity of 1 L equipped with a cooling tube and a thermometer. and 2 g of polyoxyethylene nonylphenyl ether (addition of 10 moles of ethylene oxide). Under a nitrogen stream, 20 mL of a 2 mass % aqueous solution of ammonium persulfate was added when the temperature reached 80° C. in the warm bath. Next, a mixture of 140.2 g of methyl methacrylate, 80.0 g of ethyl methacrylate, and 0.2 g of n-lauryl mercaptan as a chain transfer agent was added dropwise over 1 hour. Next, 2 mL of a 2% by mass aqueous solution of ammonium persulfate was added to start the reaction. After 3 hours, the temperature in the flask was raised to 85°C and maintained for 1 hour. Thereafter, filtration was performed through a 300-mesh wire me...

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Abstract

A method for weatherability evaluation is provided by which the weatherability of a fluorinated coating film is accurately evaluated in a short time. The method for evaluating the weatherability of a fluorinated coating film is characterized by comprising: a fluorinated-coating-film deterioration step (I) comprising a step (ia) in which the fluorinated coating film is irradiated with light from a xenon arc lamp and a step (ib) in which an aqueous hydrogen peroxide solution is caused to adhere to and wet the fluorinated coating film being irradiated with the light from a xenon arc lamp; and an evaluation step (II) in which a property of the fluorinated coating film is compared between before and after the deterioration step (I), thereby evaluating the weatherability of the fluorinated coating film.

Description

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Claims

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Application Information

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Owner ASAHI GLASS CO LTD
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