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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 resulting coating film is low, and since the fluorine-containing resin and cross-linking The compatibility of the acrylic resin after the reaction is low, resulting in insufficient water resistance, solvent resistance, stain resistance, and hardness of the coating film

Method used

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  • Fluorine-containing aqueous coating composition
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Examples

Experimental program
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Effect test

preparation example Construction

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

[0080] The solution polymerization method, polymerization conditions, organic solvent, polymerization initiator, molecular weight regulator, and the like are preferably those exemplified in the above-mentioned functional group-containing fluorine-containing olefin copolymer (A1).

[0081] A compound (a2) having a functional group that can react with a carboxyl group or a hydroxyl group and a polymerizable unsaturated double bond is reacted with the obt...

Synthetic 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 octanoyl peroxide solution (solid content 30%) under stirring state, then add 178g (2.5 moles) ethyl vinyl ether, 287g (2.5 moles) hydroxybutyl vinyl ether, 250 g (1.2 mol) of a mixture of 3-(2-allyloxyethoxyl)propionic acid [=reaction product of ethylene glycol monoallyl ether and succinic anhydride]. After the monomer addition was complete, an additional 60 g of the same peroxide solution was added two hours later. After further continuing to stir for 2 hours, the temperature was raised to 80° C., and stirred for 3 hours. The reaction mixture was cooled to room temperature, and the unreacted monomers were removed, followed by nitrogen exchange to obtain 3.4 kg of the product (36.9% by weight of solid content). The composition of the obtained copolymer was 50 m...

Embodiment 1

[0156] Put 50g of the above-mentioned F-1 into a 100ml plastic cup (polycap), then add 0.5g thickener (プライマル QR708), 0.25g defoamer (Byk023), 0.15g sulfate ester type anionic surfactant (Japan Emulsifier Co., Ltd. (Newcol-707SF) and 5.0 g of ion-exchanged water were stirred at 1000 rpm for 20 minutes with a homogenizer, and left overnight. Add 14.5g of ethylene oxide-modified non-blocking isocyanate compound (Bayhiju-Lu 3100), 3.5g of methoxypropyl acetate, slowly add 20g of ion-exchanged water while stirring at 2000rpm, about Stir for 5 minutes. This mixture was filtered through a sieve, and coated with an applicator on an aluminum panel previously coated with a solvent-soluble cross-linked fluorine-containing paint (white) and sanded to prepare a coated panel. This coated panel was allowed to stand at room temperature for 5 days to be cured, and a test piece was prepared to check the following properties. The results are shown in Table 1.

[0157] Appearance: Visually obs...

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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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