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Aqueous fluorinated polyurethane coating material and preparation method therefor

A water-based polyurethane and polyurethane coating technology, applied in the coating field, can solve the problems of low surface energy, poor water resistance of the coating and high bonding force, and achieve the effects of increasing coating mechanics, excellent hydrophobicity and low cost

Inactive Publication Date: 2017-12-01
杭州青杭新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is in order to overcome the poor water-resistance shortcoming of existing waterborne polyurethane paint coating, the present invention is on the basis of commercialized waterborne polyurethane emulsion (WPU), adds a very small amount of fluorine-containing siloxane and the end is epoxy group (or amino) siloxane, using the principle that the two siloxanes migrate to the surface of the coating film while condensing during the curing process of the coating film, a fluorine-containing polyurethane coating with low surface energy and high bonding force with the substrate is obtained.

Method used

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  • Aqueous fluorinated polyurethane coating material and preparation method therefor
  • Aqueous fluorinated polyurethane coating material and preparation method therefor
  • Aqueous fluorinated polyurethane coating material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mix 20 parts by volume of absolute ethanol, 0.5 parts by volume of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560), 0.2 parts by volume of heptadecanofluorodecyltriethyl Oxysilane (FAS-17) was mixed uniformly under magnetic stirring, and the pH value was slowly adjusted to about 4 with 15wt% hydrochloric acid, and the epoxy-containing and fluorine-containing silicone sol was obtained after reacting at room temperature for 45 minutes.

[0023] (2) At room temperature, mix 0.6, 0.8, and 1.0 parts by volume of the above-mentioned sol with 10 parts of WPU (Hefei Anke Fine Chemical Co., Ltd., PU-405C, cationic, solid content 19±1%), and mix them at room temperature. Stir magnetically for 0.5-1 hour to obtain a series of water-based fluorine-containing polyurethane coatings (F-WPU). After dip-coating this series of water-based fluorine-containing polyurethane coatings (F-WPU) on the glass surface, they were cured at 120°C for 20 minutes. The contact angle and fluorine ...

Embodiment 2

[0029] (1) Add 20 parts by volume of absolute ethanol, 0.5 parts by volume of γ-(2,3-epoxypropoxy)propyltriethoxysilane, and 0.3 parts by volume of heptadecafluorodecyltriethoxy The silane (FAS-17) was mixed evenly under magnetic stirring, and the pH was slowly adjusted to about 4 with 15wt% hydrochloric acid, and the fluorine-containing silicone sol was obtained after reacting at room temperature for 45 minutes.

[0030] (2) At room temperature, mix 0.8 parts by volume of the above-mentioned sol with 10 parts of water-based polyurethane emulsion (Hefei Anke Fine Chemical Co., Ltd., PU-405C, solid content 19±1%), and stir magnetically at room temperature for 0.5 to 1 hour, A waterborne fluorine-containing polyurethane coating (F-WPU) was obtained. Dip coating and drying are the same as in Example 1. After testing, the surface properties of the coating are similar to Example 1.

Embodiment 3

[0032] (1) 20 parts by volume of absolute ethanol, 0.5 parts by volume of γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH560), 0.3 parts by volume of tridecafluorooctyl triethyl The oxysilane was mixed evenly under magnetic stirring, and the pH was slowly adjusted to about 4 with 15 wt% hydrochloric acid, and the fluorine-containing silicone sol was obtained after reacting at room temperature for 45 minutes.

[0033] (2) At room temperature, mix 4 parts by volume of the above-mentioned sol with 10 parts of water-based polyurethane emulsion (Hefei Anke Fine Chemical Co., Ltd., PU-405C, solid content 19±1%), and stir magnetically at room temperature for 0.5 to 1 hour, A waterborne fluorine-containing polyurethane coating (F-WPU) was obtained. Dip coating and drying are the same as in Example 1. After testing, the surface properties of the coating are similar to Example 1.

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Abstract

The invention relates to an aqueous fluorinated polyurethane coating material and a preparation method therefor. The method comprises the steps of subjecting fluorinated siloxane and epoxy group or amido containing siloxane to hydrolysis, forming an R group containing silanol mixed solution, i.e., sol after the hydrolysis-mild condensation of the two siloxanes, then, adding the sol into an aqueous polyurethane emulsion, and carrying out drying, thereby forming an aqueous coating material. A coating, obtained after coating drying, has a surface water droplet contact angle of 100 degrees to 160 degrees and has a water-sprinkling preventing effect on surfaces of fabrics. The use level of the fluorinated siloxane is only 0.05v% to 0.1v%, and then, the fluorine content of the surface of the coating can reach 0.7w% to 2.0w%. The coating material is simple in production process, low in cost and environmentally friendly in producing and coating processes and is extensively applied to the fields of fabric water-repellent finishing, paper water proofing, timber water proofing and the like.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based fluorine-containing polyurethane coating and a preparation method thereof. Background technique [0002] Waterborne polyurethanes are widely used in wood varnishes and textile finishes. The usual preparation method is to introduce hydrophilic segments or side groups into the main chain of polyurethane, so that it can be well dispersed in water to form a stable emulsion without the need for additional emulsifiers. However, the introduction of hydrophilic groups makes the formed coating have higher surface free energy, which reduces the water resistance of the coating. In order to make up for this defect, it is often necessary to embed some strong hydrophobic segments such as polydimethylsiloxane on the main chain of waterborne polyurethane (Polyurethane Industry, 2013, 28 (5), 28-31), or on the main chain Introduction of fluoropolyacrylic acid (Ind. Eng. Chem. Res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D183/08C09D5/16D06M15/564D06M15/657C03C17/32C03C17/34D06M101/06
CPCC09D175/04C03C17/322C03C17/3405C09D5/16D06M15/564D06M15/657D06M2101/06C08L83/08
Inventor 冯杰金文钟
Owner 杭州青杭新材料科技有限公司
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