Fluorine-containing aqueous coating composition

A technology of water-based coatings and compositions, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of low compatibility, water resistance of coating films, solvent resistance and pollution resistance, insufficient hardness, low crosslinking density, etc. question

Inactive Publication Date: 2006-02-22
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since no cross-linking functional group is introduced into the fluorine-containing resins of these examples, no chemical bond is generated between the fluorine-containing resin and the acrylic resin, so the overall cross-linking density of the resultin

Method used

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  • Fluorine-containing aqueous coating composition
  • Fluorine-containing aqueous coating composition

Examples

Experimental program
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Example Embodiment

[0079] The preparation of the fluorine-containing polymer (a1) is the same as the above-mentioned functional group-containing fluorine-containing olefin copolymer (A1), and it is preferably prepared by a solution polymerization method. If prepared by emulsion polymerization, the polymerization is insufficient due to the low polymerizability of the fluoroolefin, the low polymerizability of the monomer containing carboxyl and hydroxyl groups, the large composition distribution of the polymer, and the need for a large amount of emulsifiers.

[0080] The solution polymerization method and polymerization conditions, organic solvents, polymerization initiators, molecular weight modifiers, etc. are preferably exemplified in the functional group-containing fluorinated olefin copolymer (A1).

[0081] The compound (a2) having a functional group reactive with a carboxyl group or a hydroxyl group and having a polymerizable unsaturated double bond is reacted with the obtained fluoropolymer (a1...

Example Embodiment

[0153] Synthesis example 1

[0154] 1.6 kg of acetone, 500 g of isopropanol, and 680 g (6.8 mol) of tetrafluoroethylene were added to a 6-liter stainless steel autoclave, and after nitrogen exchange, the temperature was raised to 67.5°C. Add 60g of octanoyl peroxide solution (30% solid content) under stirring, and then add 178g (2.5mol) ethyl vinyl ether, 287g (2.5mol) hydroxybutyl vinyl ether, A mixture of 250 g (1.2 moles) of 3-(2-allyloxyethoxyyl)propionic acid [= reaction product of ethylene glycol monoallyl ether and succinic anhydride]. After the monomer addition was completed, another 60 g of the same peroxide solution was added two hours later. After further stirring for 2 hours, the temperature was raised to 80°C and stirred for 3 hours. The reaction mixture was cooled to room temperature, the unreacted monomer was purged, and then nitrogen exchange was performed to obtain 3.4 kg of product (solid content 36.9% by weight). The composition of the obtained copolymer was 50 ...

Example Embodiment

[0155] Example 1

[0156] Pour 50g of the above F-1 into a 100ml plastic cup (ポリカツプ), and then add 0.5g thickener (PuraィマルQR708), 0.25g defoamer (Byk023), 0.15g sulfate type anionic surfactant (Japan Emulsifier (Newcol-707SF manufactured by Co., Ltd.) and 5.0 g of ion-exchanged water were stirred with a homogenizer at 1000 rpm for 20 minutes and left overnight. Add 14.5g of ethylene oxide-modified non-blocked isocyanate compound (バィヒジュ-ル3100), 3.5g of methoxypropyl acetate, and slowly add 20g of ion-exchanged water while stirring at 2000rpm. Stir for 5 minutes. The mixture was filtered with a sieve, and then coated with a coater on an aluminum plate preliminarily coated with a solvent-soluble cross-linked fluorine-containing paint (white) and sanded to form a coated plate. The coated plate was allowed to stand at room temperature for 5 days to be cured to prepare a test piece, and the following characteristics were checked. The results are shown in Table 1.

[0157] Appearance: Vi...

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Abstract

A fluorine-containing aqueous coating composition composed of (A) an aqueous emulsion of a functional group-containing fluororesin obtained by dispersing, in water, a fluoroolefin copolymer having a functional group that is obtained through solution polymerization and (B) a water-dispersible unblocked isocyanate compound is disclosed. The fluororesin aqueous coating composition can be cured at ordinary temperature, and a coating formed therefrom is excellent in chemical resistance, water resistance, solvent resistance, contamination resistance, hardness, weathering resistance and durability.

Description

technical field [0001] The present invention relates to a water-based coating composition which can be cured at normal temperature and can provide a coating film excellent in solvent resistance, weather resistance, coating film hardness, gloss and the like. Background technique [0002] It has been known in the past that water-based fluorine-containing resin compositions are used as resins for weather-resistant water-based paints, but generally related cross-linked water-based paints are more water-resistant, solvent-resistant, stain-resistant, and paint hardness than cross-linked water-based paints. Solvent paints perform poorly. [0003] In order to improve this, the development of cross-linked fluorine-containing resins used in water-based paints has also been studied, but it is not sufficient yet. For example, examples of copolymers of chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene, and a monomer having a crosslinkable functional group include US Pate...

Claims

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Application Information

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IPC IPC(8): C09D127/12C09D175/00
Inventor 井本克彦和田进长门大毛利晴彦本多香代子
Owner DAIKIN IND LTD
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