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High-durability antifogging coating film and coating composition

A technology for coating compositions and films, applied in the directions of coatings, chemical instruments and methods, synthetic resin layered products, etc., can solve problems such as defects, whitening (the appearance of water drop marks, etc.) Excellent performance and good anti-fogging effect

Active Publication Date: 2020-09-18
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, due to the presence of the remaining hydrophilic compound that is not provided for the coating of the metal oxide, when exposed to harsh environments such as high-temperature and high-humidity environments, there may be elution of the hydrophilic compound on the surface of the coating film and Furthermore, the elution from the entire coating film causes the problem of poor appearance such as whitening (production of water drop marks)

Method used

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  • High-durability antifogging coating film and coating composition
  • High-durability antifogging coating film and coating composition
  • High-durability antifogging coating film and coating composition

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Embodiment

[0272] Next, examples and comparative examples are given to explain the present invention more specifically, but the present invention is not limited to the following examples as long as it does not exceed the gist. The subject of the present invention can be determined by the appended claims, and in addition to the literal scope thereof, it also includes changes, equivalents, etc. that are obvious to those skilled in the art.

[0273] In addition, various physical properties were evaluated by the following methods.

[0274]

[0275] A solvent is appropriately added for dilution so that the solid content in the sample is 1-20% by mass, and the measurement is performed with a wet particle size analyzer (micro track UPA-9230 manufactured by Nikkiso).

[0276]

[0277] A drop of deionized water was placed on the coating film, and after being left at 23° C. for 10 seconds, measurement was performed using a contact angle measuring device (CA-X150 contact angle meter manufactured by Kyowa ...

Synthetic example 1

[0333]

[0334] Into a reactor equipped with a reflux cooler, a drip box, a nitrogen introduction tube, a thermometer, and a stirring device, 360 g of isopropanol, methacrylic acid-2-(N-3-sulfopropyl-N,N-di 75.0 g of methylammonium) ethyl ester, 20.0 g of butyl acrylate, 5.0 g of 2-hydroxyethyl methacrylate, and heating to 80°C while blowing in nitrogen. As an initiator, 1.5 g of 2,2-azobis(2,4-dimethyl-4-methoxy)valeronitrile (V-70, manufactured by Wako Pure Chemical Industries, Ltd.) was dissolved in 40 g of isopropanol The dissolved material was obtained, and the dissolved material was added dropwise in about 2 hours while maintaining the temperature in the reaction vessel at 80°C. Furthermore, stirring was continued for about 2 hours while the temperature in the reaction vessel was 80°C, and then cooled to room temperature, and isopropanol was removed under reduced pressure, thereby obtaining the hydrophilic compound (B)-1. The HLB (calculated by Griffin method) of the hydr...

Synthetic example 2

[0335]

[0336] Into a reactor equipped with a reflux cooler, a drip box, a nitrogen introduction pipe, a thermometer, and a stirring device, 100 g of polyethylene glycol monomethyl ether 4,000 (manufactured by Tokyo Chemical Industry Co., Ltd., solid content 100% by mass), KBE- 9007 (manufactured by Shin-Etsu Chemical Co., Ltd.), 6.2 g, and heated to 80°C while blowing in nitrogen. Thereafter, 0.11 g of dibutyltin dilaurate (manufactured by Tokyo Chemical Industry Co., Ltd.) was added, and stirring was continued for about 6 hours while the temperature in the reaction vessel was 80°C, and then cooled to room temperature to obtain a hydrophilic compound (B )-2. The HLB of the hydrophilic compound (B)-2 is 18. In addition, the hydrophilic compound (B)-2 has a molecular weight of 4,400 g / mol and a density of 1.14 g / cm 3 . The molecular weight here is an average molecular weight (based on JIS K7252-1) on a weight (mass) basis expressed in terms of polystyrene measured by GPC.

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Abstract

The problem addressed by the present invention is to provide an antifogging coating film having excellent antifogging property, antifogging persistence, persistence of appearance, and elution resistance. The coating film according to the present invention contains a metal oxide (A) and a hydrophilic compound (B); the height of the eluate by a coating film surface elution test is 1.0 [mu]m or less;this test is carried out by placing 10 [mu]L of deionized water on the coating film, allowing the film to stand for 24 hours in a 23 DEG C, 50% RH environment, measuring the eluate height of 20 locations selected randomly within a 10 cm2 range on the coating film surface, and determining the maximum height; and the water contact angle measured after subjecting the coating film to a moisture resistance test by exposure for 24 hours in an 85 DEG C, 85% RH environment followed by standing for one hour in a 23 DEG C, 50% RH environment, is less than 40 degrees. Preferably, the elution level per coating film unit volume by a coating film total elution test is 40 mg / cm3 or less, and this test is carried out by immersing the coating film in 23 DEG C deionized water for 24 hours, then measuring the weight of the coating film eluate recovered from the deionized water.

Description

Technical field [0001] The present invention relates to an anti-fog coating film and coating composition. The present invention particularly relates to a coating composition and an anti-fog coating film for forming an anti-fog coating film having excellent anti-fogging properties, anti-fogging durability, appearance durability, elution resistance, and the effect of suppressing the generation of water drop marks. Background technique [0002] As an alternative to glass plates, resin moldings are widely used in terms of weight reduction and moldability. As applications, resin moldings are used in a wide range of fields such as automobile parts, home appliance parts, housings, containers, films, and sheets. In particular, transparent plastics are used in various windows, optical lenses, mirrors, glasses, goggles, soundproof walls, signal lamp lenses, headlight lenses, curved mirrors, windshields, signs, etc. However, for resin substrates such as plastics, due to the difference in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04B32B17/10B32B27/20C09D5/02C09D7/47C09D7/61
CPCC09D7/61C09D175/04C08G18/706C08G2290/00C08G18/791C08G18/022C08G18/1875C08G18/246C08G18/285C08G18/283C08G18/8064C08G18/718C08G18/4833C08G18/5096C08G18/4883C09D5/00C09D7/62C08K3/36C08K9/06C08K9/08C09D7/47C03C17/009C03C17/30C03C2217/75C09D5/024B32B17/10
Inventor 伊势田一也白石健太郎丹羽三冬
Owner ASAHI KASEI KK
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