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Aqueous coating material, method for the production thereof, and use thereof

A water-based coating, unsaturated technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of tributyl phosphate toxicity and other problems, and achieve the effect of easy preparation

Active Publication Date: 2008-12-24
BASF COATINGS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In practice, however, N-methylpyrrolidone and tributyl phosphate create toxicity problems, and attempts are therefore being made to replace them by compounds that are at least as effective, if not actually more effective, without such toxicity problems

Method used

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  • Aqueous coating material, method for the production thereof, and use thereof
  • Aqueous coating material, method for the production thereof, and use thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0082]Preparation of gray water-based base coat material 1

[0083] To better assess any film defects exhibited, a gray waterborne basecoat material prepared according to the following instructions was used:

[0084] Mixture 1a:

[0085] 26 parts by weight of an inorganic thickener (sodium magnesium phyllosilicate, 3 wt% concentration in water) is installed in the dissolver. To this initial charge are then added with stirring 30 parts by weight of deionized water, 107.5 parts by weight of butyl glycol, 4.5 parts by weight according to German patent application DE 44 37 535 A1, page 7, line 55-page , the polyurethane-modified polyacrylate prepared in line 23, and 0.6 parts by weight of the commercial defoamer Nopco at a concentration of 20.5 wt% Solution of DSX 1550. This gives mixture 1a.

[0086] Mixture 1b:

[0087] Separately, 3.2 parts by weight of an aqueous polyester resin dispersion prepared according to Example D of German patent application DE 4009858A1, colu...

Embodiment 1-7

[0108] Embodiment 1-7 (the present invention) and C1 (comparison)

[0109] Preparation of water-based base coat material 2-8 (embodiment 1-7) and water-based base coat material C1 (embodiment C1)

[0110] Water-based base coat material C1:

[0111] Aqueous undercoat material C1 was prepared by adding 0.5 wt% of N-methylpyrrolidone to aqueous undercoat material 1 obtained in Preparation Example 1.

[0112] Aqueous undercoat materials 2-8 were prepared by adding the organic solvent (C) and wetting agent or dispersant (B) specified in Table 1 to the aqueous undercoat material 1 obtained in Preparation Example 1.

[0113] Table 1: Composition of the waterborne basecoat materials (ABC) of Examples 1-7

[0114]

[0115] The weight percentages in Table 1 are based on the corresponding waterborne basecoat material.

Embodiment 8-14

[0116] Embodiment 8-14 (the present invention) and C2 (comparison)

[0117] Preparation of Multicoat Paint System 2-8 (Examples 8-14) and Multicoat Paint System C1 (Example C2)

[0118] The multicoat coating system C1 of Example C2 was prepared using the aqueous basecoat material C1 from Example C1.

[0119] In the manner shown in Table 2, the multicoat coating systems 2-8 of Examples 8-14 were prepared using the aqueous basecoat materials 2-8 from Examples 1-7.

[0120] Table 2: Multicoat Coating Systems 2-8 of Examples 8-14

[0121] water-based base coat material

[0122] Spray blocking was measured by preparing multicoat paint systems C1 and 2-8 according to the following general guidelines:

[0123] A steel plate with a size of 30 x 50 cm and with a surface coating was sprayed for 30 seconds from a distance of 1.5 meters with a spray of an aqueous basecoat material. After a flash off time of 2 minutes, the aqueous basecoat material was spray coated at 1.5 cros...

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Abstract

Disclosed is an aqueous coating material containing (A) at least one saturated and / or unsaturated polyurethane and / or an ionically and / or non-ionically stabilized polyurethane grafted with olefinically unsaturated compounds, (B) at least one wetting agent or dispersing agent, and (C) at least one organic solvent selected among the group comprising dimethylsulfoxide, sulfolane, 2-methyl-1-butanol, 3-methyl-1-butanol, 2-methyl-1-pentanol, hexylglycol, 1,6-hexanediol, diethylene glycol, triethylene glycol, glycerin, trimethylolpropane solutions, pentaerythrite solutions, sorbit solutions, reactive polyether polyols having a number-average molecular weight of 110 to 6,000 Dalton and a hydroxyl number of 25 to 1,000 mg KOH / g, propylene glycol monobutyl ether, dipropylene glycol dimethyl ether, glycerin ethoxylate, ethyl-3-ethoxypropionate, gamma-butyrolactone, N-(2-hydroxyethyl); -piperidine, N-methylmorpholine, N-(2-hydroxyethyl)-morpholine, N-acetylmorpholine, N-cyclohexyl pyrrolidone, and N-octyl-2-pyrrolidone. Also disclosed are a method for producing said aqueous coating material and the use thereof.

Description

technical field [0001] The present invention relates to novel coatings. The invention also relates to a new method of preparing waterborne paints. The invention additionally relates to the use of the novel coating and the use of the waterborne coating prepared by the novel method. Background technique [0002] Aqueous coatings are known which comprise at least one ionically and / or nonionically stabilized polyurethane which is saturated, unsaturated and / or grafted with ethylenically unsaturated compounds. They can be cured physically, thermally or both thermally and with actinic radiation. Preferably, they contain pigmented and / or effect pigments and are used for the production of pigmented and / or effect paint systems, especially basecoats, or monochrome topcoats as part of multicoat paint systems. [0003] Known waterborne coatings can contain organic solvents, especially high-boiling ("long") organic solvents, such as heterocyclic, aliphatic or aromatic hydrocarbons, mon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04
CPCC08G18/0823C08G18/0866C08K5/05C09D5/024C09D175/04C09D7/20
Inventor B·施泰因梅茨M·埃伯特E·罗尔B·德皮施G·胡克曼
Owner BASF COATINGS GMBH
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