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Polyurethane coating composition, cured coating film and resin member

A technology of polyurethane coatings and compositions, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy damage to the coating film, easy flow of surfactants, and decreased appearance of the coating film, and achieves good scratch resistance, The effect of excellent anti-fog persistence

Active Publication Date: 2021-09-21
NOF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when considering the actual use of the above-mentioned coating film (for example, when using for a long time, or when wet wiping the surface of the coating film, etc.), the surfactant in the inside of the coating film tends to flow out, resulting in a decrease in anti-fogging properties.
On the other hand, although the anti-fog persistence can be improved to some extent by adding a large amount of surfactant, it cannot be greatly improved, and there is also a problem that the coating film is easily damaged and the appearance of the coating film is also deteriorated.

Method used

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  • Polyurethane coating composition, cured coating film and resin member
  • Polyurethane coating composition, cured coating film and resin member
  • Polyurethane coating composition, cured coating film and resin member

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method of the blocked polyisocyanate compound is not limited in any way. Generally, the polyisocyanate compound and the thermally dissociative blocking agent can be reacted by heating and stirring at a temperature of 0-100° C. in the presence of a catalyst. And get. Examples of the catalyst include organic metal salts such as tin, zinc, and lead; and alkali metal alcoholates such as sodium methoxide. In addition, an organic solvent can be used for the above-mentioned reaction, and an organic solvent inactive to isocyanate groups is preferably used as the organic solvent, and examples thereof include hydrocarbon solvents such as toluene and xylene.

[0036] The blocked polyisocyanate compound can be a compound in which all isocyanate groups are blocked, or a compound in which some isocyanate groups are blocked. From the perspective of improving the usable time (storage period) of the polyurethane coating composition, preferably all The isocyanate groups ...

Embodiment 1～10、 comparative example 1～13

[0137] Blend above-mentioned raw material with the ratio shown in table 1 and table 2, further, with respect to the polyisocyanate of 100 weight parts, add the di-n-butyltin dilaurate of 0.5 weight part respectively as catalyst, obtain the polyurethane of embodiment and comparative example coating composition.

[0138] Each polyurethane coating composition obtained above was coated on a polycarbonate resin plate (7.5 cm x 10 cm x 2 mm, MITSUBISHI GAS CHEMICAL COMPANY, INC. Manufacture, Iupilon), heat-cured in an oven set at 120° C. for 30 minutes to obtain a resin substrate (member) having a cured coating film. Evaluation was performed by the following test method. The results are shown in Table 1 and Table 2.

[0139]

[0140] The surface of the cured coating film was visually judged and evaluated by the following evaluation criteria.

[0141] ○: Normal

[0142] ×: There are abnormalities such as opacity and whitening, or it is not smooth

[0143]

[0144] Steel wool...

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Abstract

The present invention provides a one-component polyurethane coating composition capable of forming a cured coating film having good scratch resistance and excellent anti-fog persistence, and a resin member having the cured coating film. The polyurethane coating composition contains a specific amount of polyisocyanate (a), polyether polyol (b) and surfactant (c), and the polyether polyol (b) has a number average molecular weight of more than 300 and less than 600 Polyether polyol (b‑1), polyether polyol (b‑2) with number average molecular weight of 600 to 900, polyether polyol (b‑3) with number average molecular weight of 900 to 1800, all The above-mentioned surfactant (c) is an ionic surfactant having a hydroxyl group in a molecule, an anionic surfactant and / or an amphoteric surfactant not having a group reactive with an isocyanate group.

Description

technical field [0001] The present invention relates to polyurethane coating composition, cured coating film and resin member. Background technique [0002] Conventionally, it has been known that when the surface of a base material such as a synthetic resin molded article or glass is below the dew point temperature, moisture in the atmosphere turns into water droplets and adheres to the surface of the base material. As a result, light scattering due to attached water droplets is caused to generate fog, and therefore, for example, when the above-mentioned base material is used for eyeglasses, the field of view is obstructed. [0003] As a method for preventing the above-mentioned fog generation (anti-fogging), a method of applying a solution mixed with a hydrophilic resin, a surfactant, etc. on the surface of a substrate to form a coating film (dried coating film or cured coating film) is known. . [0004] In this method, the surfactant contained in the coating film lowers ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D7/65
CPCC09D7/65C09D175/08C08L2205/03C08L2205/025C08L83/12C09D175/04C08L71/00C09D7/40C08L91/00C08L67/04C08J7/04C08J2475/04
Inventor 冈本恭征桥本雄一
Owner NOF CORP
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