Self cleaning heat insulation paint for building outer wall and roof and preparation method thereof

Abstract

The invention provides self cleaning heat insulation paint for a building outer wall and a roof and a preparation method thereof. According to the method, firstly, vinyl-vinyl acetate copolymer emulsion is used as polymerization seeds; the grafting polymerization is performed with perfluoroalkylethyl acrylate and acrylic acid; a composite emulsion is prepared; then, heptadecyl trimethoxy silane isused for performing surface modification on the micrometer and nanometer heat insulation filling materials; finally, the composite emulsion, the fluorine modified micrometer filling materials, pigments, wet dispersing agents, polyvinyl formal glue, ammonium hydroxide, crosslinking agents, antifoaming agents, UV absorbing agents and a proper amount of water are uniformly mixed to prepare the selfcleaning heat insulation paint for the building outer wall and the roof. Compared with a conventional method, the coating prepared by the heat insulation paint has high contact angle on water and oil;water drips or oil drips cannot be automatically spread on the surface of the coating and can maintain the sphere shape; the rolling falling on the surface can easily occur; other adhered contaminants can be brought away, so that good self cleaning effects are shown.

Description

technical field

[0001] The invention belongs to the technical field of functional coatings, and provides a self-cleaning heat-insulating coating for exterior walls and roofs of buildings and a preparation method. Background technique

[0002] Generally, architectural coatings have decorative, protective, and habitability-improving functions. Acrylic paint is a one-component water-emulsion waterproof paint made of pure acrylic polymer emulsion as the base material and other additives. It has good aging resistance, elongation, elasticity, adhesion and film-forming properties, and the overall waterproof effect Good, it can be used in non-long-term flooding environments such as roofs, walls, bathrooms, and basements. It is especially suitable for roof waterproofing projects with light-weight thin shell structures, and can also be used as exterior wall decorative coatings. The performance of ethylene-vinyl acetate (EVA) waterproof coatings is similar to that of acrylic coatings,...

Examples

Embodiment 1

[0023] (1) Stir and heat the ethylene-vinyl acetate copolymer emulsion to 67°C, add ammonium persulfate aqueous solution, sodium bicarbonate aqueous solution, and sodium dodecylsulfonate under nitrogen protection, heat up to 83°C, and then add dropwise Perfluoroalkyl ethyl acrylate and acrylic acid were copolymerized for 4 hours under stirring to obtain a composite emulsion; the solid content of the ethylene-vinyl acetate copolymer emulsion was 56%, and the mass ratio of ethylene to vinyl acetate was 15:85 The mass concentration of ammonium persulfate aqueous solution is 7%; The mass concentration of sodium bicarbonate aqueous solution is 4%; Perfluoroalkyl ethyl acrylate is perfluorooctyl ethyl acrylate; The parts by weight of each raw material are, ethylene- Vinyl acetate copolymer emulsion 61.4 parts by weight, ammonium persulfate aqueous solution 2.5 parts by weight, sodium bicarbonate aqueous solution 1.4 parts by weight, sodium dodecylsulfonate 0.7 parts by weight, perflu...

Embodiment 2

[0028] (1) Stir and heat the ethylene-vinyl acetate copolymer emulsion to 66°C, add ammonium persulfate aqueous solution, sodium bicarbonate aqueous solution, and sodium dodecylsulfonate under nitrogen protection, raise the temperature to 81°C, and then add dropwise Perfluoroalkyl ethyl acrylate and acrylic acid, copolymerization reaction 4.5h under stirring state, make composite emulsion; The solid content of ethylene-vinyl acetate copolymer emulsion is 52%, and the mass ratio of ethylene and vinyl acetate is 15: 85; the mass concentration of ammonium persulfate aqueous solution is 6%; the mass concentration of sodium bicarbonate aqueous solution is 3.5%; perfluoroalkyl ethyl acrylate is perfluorohexyl ethyl acrylate; the parts by weight of each raw material are, ethylene- Vinyl acetate copolymer emulsion 63.9 parts by weight, ammonium persulfate aqueous solution 2.3 parts by weight, sodium bicarbonate aqueous solution 1.2 parts by weight, sodium dodecylsulfonate 0.6 parts by ...

Embodiment 3

[0033] (1) Stir and heat the ethylene-vinyl acetate copolymer emulsion to 69°C, add ammonium persulfate aqueous solution, sodium bicarbonate aqueous solution, and sodium dodecylsulfonate under nitrogen protection, raise the temperature to 84°C, and then add dropwise Perfluoroalkyl ethyl acrylate and acrylic acid, copolymerization reaction 3.5h under stirring state, make composite emulsion; The solid content of ethylene-vinyl acetate copolymer emulsion is 58%, and the mass ratio of ethylene and vinyl acetate is 15: 85; the mass concentration of ammonium persulfate aqueous solution is 7%; the mass concentration of sodium bicarbonate aqueous solution is 4.5%; perfluoroalkyl ethyl acrylate is perfluorobutyl ethyl acrylate; the parts by weight of each raw material are, ethylene - 58.7 parts by weight of vinyl acetate copolymer emulsion, 2.7 parts by weight of ammonium persulfate aqueous solution, 1.7 parts by weight of sodium bicarbonate aqueous solution, 0.9 parts by weight of sodi...

technical field

[0001] The invention belongs to the technical field of functional coatings, and provides a self-cleaning heat-insulating coating for exterior walls and roofs of buildings and a preparation method. Background technique

[0002] Generally, architectural coatings have decorative, protective, and habitability-improving functions. Acrylic paint is a one-component water-emulsion waterproof paint made of pure acrylic polymer emulsion as the base material and other additives. It has good aging resistance, elongation, elasticity, adhesion and film-forming properties, and the overall waterproof effect Good, it can be used in non-long-term flooding environments such as roofs, walls, bathrooms, and basements. It is especially suitable for roof waterproofing projects with light-weight thin shell structures, and can also be used as exterior wall decorative coatings. The performance of ethylene-vinyl acetate (EVA) waterproof coatings is similar to that of acrylic coatings,...

Examples

Embodiment 1

[0023] (1) Stir and heat the ethylene-vinyl acetate copolymer emulsion to 67°C, add ammonium persulfate aqueous solution, sodium bicarbonate aqueous solution, and sodium dodecylsulfonate under nitrogen protection, heat up to 83°C, and then add dropwise Perfluoroalkyl ethyl acrylate and acrylic acid were copolymerized for 4 hours under stirring to obtain a composite emulsion; the solid content of the ethylene-vinyl acetate copolymer emulsion was 56%, and the mass ratio of ethylene to vinyl acetate was 15:85 The mass concentration of ammonium persulfate aqueous solution is 7%; The mass concentration of sodium bicarbonate aqueous solution is 4%; Perfluoroalkyl ethyl acrylate is perfluorooctyl ethyl acrylate; The parts by weight of each raw material are, ethylene- Vinyl acetate copolymer emulsion 61.4 parts by weight, ammonium persulfate aqueous solution 2.5 parts by weight, sodium bicarbonate aqueous solution 1.4 parts by weight, sodium dodecylsulfonate 0.7 parts by weight, perflu...

Embodiment 2

[0028] (1) Stir and heat the ethylene-vinyl acetate copolymer emulsion to 66°C, add ammonium persulfate aqueous solution, sodium bicarbonate aqueous solution, and sodium dodecylsulfonate under nitrogen protection, raise the temperature to 81°C, and then add dropwise Perfluoroalkyl ethyl acrylate and acrylic acid, copolymerization reaction 4.5h under stirring state, make composite emulsion; The solid content of ethylene-vinyl acetate copolymer emulsion is 52%, and the mass ratio of ethylene and vinyl acetate is 15: 85; the mass concentration of ammonium persulfate aqueous solution is 6%; the mass concentration of sodium bicarbonate aqueous solution is 3.5%; perfluoroalkyl ethyl acrylate is perfluorohexyl ethyl acrylate; the parts by weight of each raw material are, ethylene- Vinyl acetate copolymer emulsion 63.9 parts by weight, ammonium persulfate aqueous solution 2.3 parts by weight, sodium bicarbonate aqueous solution 1.2 parts by weight, sodium dodecylsulfonate 0.6 parts by ...

Embodiment 3

[0033] (1) Stir and heat the ethylene-vinyl acetate copolymer emulsion to 69°C, add ammonium persulfate aqueous solution, sodium bicarbonate aqueous solution, and sodium dodecylsulfonate under nitrogen protection, raise the temperature to 84°C, and then add dropwise Perfluoroalkyl ethyl acrylate and acrylic acid, copolymerization reaction 3.5h under stirring state, make composite emulsion; The solid content of ethylene-vinyl acetate copolymer emulsion is 58%, and the mass ratio of ethylene and vinyl acetate is 15: 85; the mass concentration of ammonium persulfate aqueous solution is 7%; the mass concentration of sodium bicarbonate aqueous solution is 4.5%; perfluoroalkyl ethyl acrylate is perfluorobutyl ethyl acrylate; the parts by weight of each raw material are, ethylene - 58.7 parts by weight of vinyl acetate copolymer emulsion, 2.7 parts by weight of ammonium persulfate aqueous solution, 1.7 parts by weight of sodium bicarbonate aqueous solution, 0.9 parts by weight of sodi...

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