Waterborne coil coating polyester rear face paint and preparation method thereof

A technology of coil coating and back coating, applied in the field of coatings, can solve the problems of difficult to meet the requirements of volatile organic content standards, poor adhesion and pressure resistance, low solid content, etc., and achieve good hardness, good pressure resistance, and solid with high effect

Active Publication Date: 2016-05-04
NIPPON PAINT IND COATINGS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acrylic back paint has the disadvantage of high price; epoxy back paint has high hardness, good adhesion and pressure resistance, but the disadvantage is low solid content and poor flexibility; common polyester back paint has high solid content, low paint consumption and relatively low price Cheap, good flexibility, but relatively poor adhesion and pressure resistance, the performance of polyester modified epoxy back paint is between the two
At the same time, the existing epoxy polyester back paint and polyester modified epoxy back paint are difficult to meet the requirements of the Ministry of Environmental Protection for the content of volatile organic compounds (VOC)

Method used

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  • Waterborne coil coating polyester rear face paint and preparation method thereof
  • Waterborne coil coating polyester rear face paint and preparation method thereof
  • Waterborne coil coating polyester rear face paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Prepare described waterborne coil coating polyester back paint by following weight distribution ratio:

[0068] Polyester resin: 35 parts;

[0069] Titanium dioxide R-996: 30 parts;

[0070] Nickel-cadmium yellow: 5 parts;

[0071] Amino resin CYMEL327: 8 parts;

[0072] Dispersant BYK180: 0.3 parts;

[0073] Anti-sedimentation agent A-300: 0.2 parts;

[0074] Defoamer BYK011: 1 part;

[0075] Adhesion promoter ADP9999: 1 part;

[0076] Acid catalyst N-2500: 0.4 parts;

[0077] Wax additive: 0.2 parts;

[0078] Leveling agent BYK381: 0.2 parts;

[0079] Matting powder: 0.5 parts;

[0080] Ethylene glycol butyl ether: 4 parts;

[0081] Isopropanol: 2 parts;

[0082] Water: 35 parts.

[0083] Step 1: After the polyester resin is neutralized with an amine neutralizer, such as N,N-dimethylethanolamine, it is mixed with a dispersant, a pigment, an anti-sedimentation agent and the first part of water, and ground to obtain a slurry, which is controlled during grind...

Embodiment 2

[0086] Prepare described waterborne coil coating polyester back paint by following weight distribution ratio:

[0087] Polyester resin: 35 parts;

[0088] Titanium dioxide R-996: 30 parts;

[0089] Molybdenum cadmium yellow: 5 parts;

[0090] Amino resin CYMEL303: 8 parts;

[0091] Dispersant EFKA4585: 0.3 part;

[0092] Anti-sedimentation agent R-974: 0.2 parts;

[0093] Defoamer BYK024: 1 part;

[0094] Adhesion promoter RHEAD9997: 1 part;

[0095] Acid catalyst N-155: 0.4 parts;

[0096] Wax additive: 0.2 parts;

[0097] Leveling agent Tego500: 0.2 parts;

[0098] Matting powder: 0.5 parts;

[0099] Ethylene glycol butyl ether: 4 parts;

[0100] Isopropanol: 2 parts;

[0101] Water: 35 parts

[0102] The steps of the preparation method of Example 2 are the same as those of Example 1.

[0103] The prepared waterborne coil coating polyester back paint of embodiment 1, 2 all meets the performance index of following table 1, and with existing waterborne acrylic bac...

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PUM

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Abstract

The invention discloses waterborne coil coating polyester rear face paint and a preparation method thereof. The rear face paint comprises, by weight, 30-40 parts of polyester resin, 30-35 parts of pigment filler, 7-10 parts of amino resin, 0-0.5 part of dispersant, 0.1-0.5 part of an anti-settling agent, 0.5-1.2 parts of an antifoaming agent, 0.5-3 parts of adhesion promoter, 0.1-0.5 part of an acid catalyst, 0.1-0.5 part of a wax auxiliary agent, 0.1-0.3 part of a flatting agent, 0.1-2 parts of extinction powder, 4-6 parts of butyl cellosolve, 2-4 part of isopropanol and 35-40 parts of water. The invention further discloses the preparation method of the rear face paint. According to the waterborne coil coating polyester rear face paint and the preparation method thereof, water serves as a dispersion medium, so that the rear face paint has the advantages of being environmentally friendly, low in cost, excellent in scratch resistance, corrosion resistance and solvent resistance, not sticky, good in foaming performance and the like, and the rear face paint is equivalent to solvent type polyester rear face paint in performance; waterborne rust resistance is achieved, and corrosion resistance is more excellent.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based coil coating polyester back paint and a preparation method thereof. Background technique [0002] Coil coatings include coil steel coatings and coil aluminum coatings, which are coated on the surface of steel plates and aluminum materials by roller coating, and then made into pre-coated coils (color-coated plates), which have beautiful appearance, It has the advantages of bright colors, high strength, and convenient processing and molding. It can also reduce costs and reduce pollution, so it has been widely used. [0003] Coil coating substrates include cold-rolled steel sheets, hot-dip galvanized steel sheets, electro-galvanized steel sheets, zinc-aluminum alloy steel sheets, aluminum sheets, etc., with a thickness between 0.1-0.5mm. Coil coating generally adopts the two-coating and two-baking process of primer and topcoat. The primer and topcoat are applied on t...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D161/32C09D7/12
Inventor 张冠军田昕韩华
Owner NIPPON PAINT IND COATINGS SHANGHAI
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