Aqueous coating material for exterior wall painting

Abstract

The present invention discloses an aqueous coating material for exterior wall painting. The aqueous coating material comprises 35-50 wt% of a film-forming substance, 1-6 wt% of a color filler, 25-45 wt% of water, and the balance of an auxiliary agent, wherein the film-forming substance preparation steps comprise: mixing isophorone diisocyanate and PPG according to a weight ratio of 1:3-12), carrying out a first reaction for 2-5 h at a temperature of 60-90 DEG C under catalysis of dibutyltin dilaurate having the amount of 2-5% wt% of the isophorone diisocyanate, adding N-methyl pyrrolidone, 2,2-dihydroxymethyl propionic acid, an epoxy resin and diglycolamine, carrying out a second reaction for 1-4 h at a temperature of 80-85 DEG C, carrying out rotary evaporation, and drying for 1-10 h at a temperature of 45-55 DEG C to obtain the film-forming substance. According to the present invention, the aqueous coating material has characteristics of rapid drying, good hardness, good boiling water resistance, good room temperature water resistance, good alkali resistance, and good dry heat resistance, and is suitable for external wall painting.

Description

technical field

[0001] The invention relates to the technical field of coatings, in particular to a water-based coating used for exterior wall painting. Background technique

[0002] Any paint that uses water as a solvent or as a dispersion medium can be called a water-based paint. Water-based paints include water-soluble paints, water-diluted paints, water-dispersible paints (latex paints), and the like. Water-soluble coatings use water-soluble resins as film-forming materials, represented by polyvinyl alcohol and its various modified products, in addition to water-soluble alkyd resins, water-soluble epoxy resins, and inorganic polymer water-based resins.

[0003] Chinese patent CN100348674 discloses a kind of anti-acid and alkali water-based paint, comprises existing water-based paint, also contains two kinds of phosphates in the water-based paint, the first kind is sodium dihydrogen phosphate (NaH 2 PO 4 ), Potassium dihydrogen phosphate (KH 2 PO 4 ) or ammonium dihy...

Examples

Embodiment 1

[0022] After mixing isophorone diisocyanate and PPG in a weight ratio of 1:3, the first reaction was carried out at 60°C for 2 hours under the catalysis of dibutyltin dilaurate at 2% by weight of isophorone diisocyanate, and N- Methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine were subjected to the second reaction at 80°C for 1 hour, then rotary evaporated and dried at 45°C for 1 hour to obtain a film-forming product 1; wherein, the weight ratio of the isophorone diisocyanate to the N-methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine is 1:0.2:1: 4:2.

[0023] 35% by weight of film-forming material 1, 1% by weight of dolomite powder, 40% by weight of water and 8% by weight of polyoxyethylene fatty alcohol ether, 8% by weight of diacetone alcohol and 8% by weight of propylene glycol butyl ether are mixed to obtain a water-based coating. Measure performance.

Embodiment 2

[0025] After mixing isophorone diisocyanate and PPG in a weight ratio of 1:12, the first reaction was carried out at 90°C for 5 hours under the catalysis of dibutyltin dilaurate with 5% by weight of isophorone diisocyanate weight, and N- Methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine were subjected to the second reaction at 85°C for 4 hours, then rotary evaporated and dried at 55°C for 10 hours to obtain a film-forming product 2; Wherein, the weight ratio of the isophorone diisocyanate to the N-methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine is 1:3:3: 15:8.

[0026] 40% by weight of film former 2, 4% by weight of diatomaceous earth, 30% by weight of water and 8% by weight of polyoxyethylene, 9% by weight of diacetone alcohol, and 9% by weight of propylene glycol methyl ether acetate are mixed to obtain a water-based coating , to measure performance.

Embodiment 3

[0028] After mixing isophorone diisocyanate and PPG in a weight ratio of 1:8, the first reaction was carried out at 70°C for 4 hours under the catalysis of dibutyltin dilaurate with 4% by weight of isophorone diisocyanate weight, and N- Methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine were subjected to the second reaction at 82°C for 3 hours, then rotary evaporated and dried at 50°C for 6 hours to obtain a film-forming product 3; Wherein, the weight ratio of the isophorone diisocyanate to the N-methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine is 1:1:2: 12:6.

[0029] 50% by weight of film former 3, 5% by weight of flake talcum powder, 40% by weight of water and 1% by weight of propylene glycol, 2% by weight of polydimethylsiloxane, and 2% by weight of dipropylene glycol monomethyl ether are mixed, Get the water-based paint and measure its performance.

technical field

[0001] The invention relates to the technical field of coatings, in particular to a water-based coating used for exterior wall painting. Background technique

[0002] Any paint that uses water as a solvent or as a dispersion medium can be called a water-based paint. Water-based paints include water-soluble paints, water-diluted paints, water-dispersible paints (latex paints), and the like. Water-soluble coatings use water-soluble resins as film-forming materials, represented by polyvinyl alcohol and its various modified products, in addition to water-soluble alkyd resins, water-soluble epoxy resins, and inorganic polymer water-based resins.

[0003] Chinese patent CN100348674 discloses a kind of anti-acid and alkali water-based paint, comprises existing water-based paint, also contains two kinds of phosphates in the water-based paint, the first kind is sodium dihydrogen phosphate (NaH 2 PO 4 ), Potassium dihydrogen phosphate (KH 2 PO 4 ) or ammonium dihy...

Examples

Embodiment 1

[0022] After mixing isophorone diisocyanate and PPG in a weight ratio of 1:3, the first reaction was carried out at 60°C for 2 hours under the catalysis of dibutyltin dilaurate at 2% by weight of isophorone diisocyanate, and N- Methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine were subjected to the second reaction at 80°C for 1 hour, then rotary evaporated and dried at 45°C for 1 hour to obtain a film-forming product 1; wherein, the weight ratio of the isophorone diisocyanate to the N-methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine is 1:0.2:1: 4:2.

[0023] 35% by weight of film-forming material 1, 1% by weight of dolomite powder, 40% by weight of water and 8% by weight of polyoxyethylene fatty alcohol ether, 8% by weight of diacetone alcohol and 8% by weight of propylene glycol butyl ether are mixed to obtain a water-based coating. Measure performance.

Embodiment 2

[0025] After mixing isophorone diisocyanate and PPG in a weight ratio of 1:12, the first reaction was carried out at 90°C for 5 hours under the catalysis of dibutyltin dilaurate with 5% by weight of isophorone diisocyanate weight, and N- Methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine were subjected to the second reaction at 85°C for 4 hours, then rotary evaporated and dried at 55°C for 10 hours to obtain a film-forming product 2; Wherein, the weight ratio of the isophorone diisocyanate to the N-methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine is 1:3:3: 15:8.

[0026] 40% by weight of film former 2, 4% by weight of diatomaceous earth, 30% by weight of water and 8% by weight of polyoxyethylene, 9% by weight of diacetone alcohol, and 9% by weight of propylene glycol methyl ether acetate are mixed to obtain a water-based coating , to measure performance.

Embodiment 3

[0028] After mixing isophorone diisocyanate and PPG in a weight ratio of 1:8, the first reaction was carried out at 70°C for 4 hours under the catalysis of dibutyltin dilaurate with 4% by weight of isophorone diisocyanate weight, and N- Methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine were subjected to the second reaction at 82°C for 3 hours, then rotary evaporated and dried at 50°C for 6 hours to obtain a film-forming product 3; Wherein, the weight ratio of the isophorone diisocyanate to the N-methylpyrrolidone, 2,2-dimethylolpropionic acid, epoxy resin and diglycolamine is 1:1:2: 12:6.

[0029] 50% by weight of film former 3, 5% by weight of flake talcum powder, 40% by weight of water and 1% by weight of propylene glycol, 2% by weight of polydimethylsiloxane, and 2% by weight of dipropylene glycol monomethyl ether are mixed, Get the water-based paint and measure its performance.