CN113122126A - Water-based paint for building exterior wall and preparation method thereof - Google Patents
Water-based paint for building exterior wall and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/43—Thickening agents
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention relates to the technical field of coatings, and particularly relates to a water-based paint for building exterior walls and a preparation method thereof, wherein the water-based paint comprises 50-70 parts of modified polyurethane acrylate dispersoid, 7-10 parts of plant-based antifouling auxiliary agent, 20-30 parts of nano magnesium oxide, 1-5 parts of dispersing agent, 0.5-1 part of thickening agent, 2-4 parts of film-forming auxiliary agent, 0.5-1 part of wetting agent, 0.1-0.5 part of defoaming agent and 25-35 parts of deionized water, and has good flexibility, hardness, water and oil resistance, excellent sound insulation effect, simple preparation process operation and low cost.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based paint for building exterior walls and a preparation method thereof.
Background
Compared with the traditional oil paint, the water-based paint does not contain toxic and harmful gases such as benzene, toluene, formaldehyde and the like, has obvious environmental protection advantages, and is more and more concerned by people. The water paint can be widely used on the surfaces of various materials such as buildings, industrial metal parts, woodware, plastics and the like, and the environment-friendly water paint meeting various application occasions is prepared by the mixture ratio of different components and the modification of additives.
At present, the water paint for building exterior walls mainly takes fluorocarbon emulsion, silicone-acrylic emulsion and pure acrylic emulsion as film forming substances, and has the defects of high paint film brittleness, poor flexibility and poor crack resistance; meanwhile, the existing water-based paint has the problems of poor water and oil resistance, low hardness and easy falling off, and is used for the surface of the outer wall of a building to difficultly absorb or block noise in the external environment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the water-based paint for the building outer wall, which has better flexibility, hardness, water and oil resistance and excellent sound insulation effect.
The second purpose of the invention is to provide a preparation method of the water-based paint for the building exterior wall aiming at the defects of the prior art, and the preparation method has the characteristics of simple operation and low cost.
In order to achieve one of the purposes, the invention adopts the following technical scheme:
the water-based paint for the building outer wall comprises the following raw materials in parts by weight:
in the technical scheme, the wetting agent is water-based polyether modified siloxane with a short molecular chain segment, the defoaming agent is a water-based organic silicon defoaming agent, the thickening agent is at least one of an associated polyurethane thickening agent and a hydrophobically modified alkali swelling thickening agent, the film-forming assistant is a fatty acid ester film-forming assistant, and the dispersing agent is a carboxylate anionic surfactant.
In the technical scheme, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in the technical scheme, the silane coupling agent is dimethyl dimethoxysilane or KH 550.
In the technical scheme, the preparation method of the modified polyurethane acrylate dispersion comprises the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 35-45 min at 30-40 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In the technical scheme, the preparation process of the plant-based antifouling auxiliary agent comprises the following steps:
mixing and stirring 25-30 parts by weight of starch, 0.5-0.8 part by weight of amylase and 80-90 parts by weight of water at 70-80 ℃ for 2-3 hours, then adding 6-9 parts by weight of alkali and stirring uniformly, then adding 5-8 parts by weight of hexadecyl trimethyl ammonium chloride and stirring at 85-95 ℃ for 8-15 minutes, then adding 10-12 parts by weight of soybean lecithin and 6-10 parts by weight of cyclodextrin and stirring for 40-60 minutes, and performing suction filtration, drying and crushing to obtain the plant-based antifouling auxiliary agent.
In the technical scheme, the particle size of the plant-based antifouling auxiliary agent is 0.1-10 microns, so that the surface of a paint film can be ensured to be smooth, and the paint film is not too compact and poor in flexibility due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
In order to achieve the second purpose, the invention adopts the following technical scheme:
the preparation method of the water-based paint for the building outer wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersoid, the plant-based antifouling auxiliary agent and water in a formula amount at 800-1200 rpm/min for 10-15 min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1500-1700 rpm/min for 20-30 min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in a formula amount into the first mixture, and stirring and mixing at 1000-1200 rpm/min for 8-10 min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 800-1200 rpm/min for 8-10 min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
The invention has the beneficial effects that:
(1) the water-based paint for the building outer wall, disclosed by the invention, uses the modified polyurethane acrylate dispersoid as the main resin, has better flexibility, has the characteristic of better cracking resistance when being coated on the surface of the building outer wall, and can also have the hardness of a paint film; the plant-based antifouling auxiliary agent can improve the surface smoothness of a paint film, so that the paint film is difficult to adhere and wet by water, oil and other liquid, and the water-proof and oil-proof performance of the water-based paint is improved; the nano-magnesia has the characteristics of small particle size, looseness and porosity, can absorb and obstruct sounds with different frequencies by depending on the internal pore structure, and improves the sound insulation performance of the water-based paint used for the outer wall of a building.
(2) According to the preparation method of the water-based paint for the building outer wall, the modified polyurethane acrylate dispersoid, the plant-based antifouling auxiliary agent and water are uniformly mixed, and then the nano magnesium oxide and the dispersing agent are added simultaneously, so that the nano magnesium oxide can be uniformly dispersed in a mixture system; then, the defoaming agent is added in combination with the wetting agent, so that the defoaming agent can exert the maximum defoaming effect; then adding a film forming aid and a thickening agent, thereby obtaining the water-based paint with proper viscosity and excellent film coating performance. The preparation method has the characteristics of simple operation and low cost.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 40min at 35 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
27 parts of starch, 0.6 part of amylase and 85 parts of water are mixed and stirred for 2.5 hours at the temperature of 75 ℃, then 8 parts of alkali is added and stirred uniformly, 7 parts of hexadecyl trimethyl ammonium chloride is added and stirred for 12 minutes at the temperature of 90 ℃, then 11 parts of soybean phospholipid and 8 parts of cyclodextrin are added and stirred for 50 minutes, and the plant-based antifouling auxiliary agent is obtained after suction filtration, drying and crushing.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 1 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersion, the plant-based antifouling auxiliary agent and water in a formula amount at 1000rpm/min for 13min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1600rpm/min for 25min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in the formula amount into the first mixture, and stirring and mixing at 1100rpm/min for 9min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1000rpm/min for 9min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Example 2
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 35min at 30 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
mixing and stirring 25 parts by weight of starch, 0.5 part by weight of amylase and 80 parts by weight of water at 70 ℃ for 2 hours, then adding 6 parts by weight of alkali and stirring uniformly, then adding 5 parts by weight of hexadecyl trimethyl ammonium chloride and stirring at 85 ℃ for 8 minutes, then adding 10 parts by weight of soybean phospholipid and 6 parts by weight of cyclodextrin and stirring for 40 minutes, and carrying out suction filtration, drying and crushing to obtain the plant-based antifouling auxiliary agent.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 0.1 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersoid, the plant-based antifouling auxiliary agent and water in a formula amount at 800rpm/min for 10min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1500rpm/min for 20min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in a formula amount into the first mixture, and stirring and mixing at 1000rpm/min for 8min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 800rpm/min for 8min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Example 3
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 45min at 40 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
mixing and stirring 30 parts by weight of starch, 0.8 part by weight of amylase and 90 parts by weight of water at 80 ℃ for 3 hours, then adding 9 parts by weight of alkali and stirring uniformly, then adding 8 parts by weight of hexadecyl trimethyl ammonium chloride and stirring at 95 ℃ for 15 minutes, then adding 12 parts by weight of soybean phospholipid and 10 parts by weight of cyclodextrin and stirring for 60 minutes, and carrying out suction filtration, drying and crushing to obtain the plant-based antifouling auxiliary agent.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 10 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersoid, the plant-based antifouling auxiliary agent and water in a formula amount at 1200rpm/min for 15min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1700rpm/min for 30min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in a formula amount into the first mixture, and stirring and mixing at 1200rpm/min for 10min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1200rpm/min for 10min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Comparative example 1
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this example, the aqueous polyurethane acrylate dispersion is prepared by adding 20 parts of hydroxy acrylate dropwise into 40 parts of aqueous polyurethane dispersion for polymerization.
The aqueous polyurethane dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, and the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
27 parts of starch, 0.6 part of amylase and 85 parts of water are mixed and stirred for 2.5 hours at the temperature of 75 ℃, then 8 parts of alkali is added and stirred uniformly, 7 parts of hexadecyl trimethyl ammonium chloride is added and stirred for 12 minutes at the temperature of 90 ℃, then 11 parts of soybean phospholipid and 8 parts of cyclodextrin are added and stirred for 50 minutes, and the plant-based antifouling auxiliary agent is obtained after suction filtration, drying and crushing.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 1 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the aqueous polyurethane acrylate dispersion, the plant-based antifouling auxiliary agent and water in a formula amount at 1000rpm/min for 13min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1600rpm/min for 25min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in the formula amount into the first mixture, and stirring and mixing at 1100rpm/min for 9min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1000rpm/min for 9min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Comparative example 2
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 40min at 35 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersoid and water in a formula amount at 1000rpm/min for 13min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuing stirring and dispersing at 1600rpm/min for 25min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in the formula amount into the first mixture, and stirring and mixing at 1100rpm/min for 9min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1000rpm/min for 9min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Comparative example 3
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 40min at 35 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
27 parts of starch, 0.6 part of amylase and 85 parts of water are mixed and stirred for 2.5 hours at the temperature of 75 ℃, then 8 parts of alkali is added and stirred uniformly, 7 parts of hexadecyl trimethyl ammonium chloride is added and stirred for 12 minutes at the temperature of 90 ℃, then 11 parts of soybean phospholipid and 8 parts of cyclodextrin are added and stirred for 50 minutes, and the plant-based antifouling auxiliary agent is obtained after suction filtration, drying and crushing.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 1 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing modified polyurethane acrylate dispersoid, plant-based antifouling auxiliary agent and water in a formula amount at 1000rpm/min for 13min, adding dispersing agent in a formula amount, and continuously stirring and dispersing at 1600rpm/min for 25min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in the formula amount into the first mixture, and stirring and mixing at 1100rpm/min for 9min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1000rpm/min for 9min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Comparative example 4
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 40min at 35 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
27 parts of starch, 0.6 part of amylase and 85 parts of water are mixed and stirred for 2.5 hours at the temperature of 75 ℃, then 8 parts of alkali is added and stirred uniformly, 7 parts of hexadecyl trimethyl ammonium chloride is added and stirred for 12 minutes at the temperature of 90 ℃, then 11 parts of soybean phospholipid and 8 parts of cyclodextrin are added and stirred for 50 minutes, and the plant-based antifouling auxiliary agent is obtained after suction filtration, drying and crushing.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 0.01 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersion, the plant-based antifouling auxiliary agent and water in a formula amount at 1000rpm/min for 13min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1600rpm/min for 25min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in the formula amount into the first mixture, and stirring and mixing at 1100rpm/min for 9min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1000rpm/min for 9min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Comparative example 5
In this embodiment, the wetting agent is a water-based polyether modified siloxane having a short molecular chain segment, the defoamer is a water-based silicone defoamer, the thickener is an associated polyurethane thickener, the film-forming aid is a fatty acid ester film-forming aid, and the dispersant is a carboxylate anionic surfactant.
In this embodiment, the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
in this embodiment, the silane coupling agent is dimethyldimethoxysilane or KH 550.
In this embodiment, the preparation method of the modified polyurethane acrylate dispersion includes the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 40min at 35 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
The aqueous polyurethane dispersion liquid in the modified polyurethane acrylate dispersion liquid has the advantage of good film-forming flexibility, the hydroxyl acrylate has the characteristics of high hardness and aging resistance, the hydroxyl acrylate is dripped into the aqueous polyurethane dispersion liquid, and a chemical bond is formed between the hydroxyl acrylate and the aqueous polyurethane dispersion liquid, so that the obtained aqueous polyurethane acrylate dispersion liquid has both good flexibility and high hardness; the silane coupling agent is beneficial to uniformly dispersing the nano silicon oxide powder dispersion liquid in the aqueous polyurethane acrylate dispersion to prevent agglomeration, so that the hardness and flexibility of the aqueous polyurethane acrylate dispersion are further improved; meanwhile, the nano silicon oxide powder has a thickening effect and can improve the compactness of a paint film, so that the paint film has certain waterproofness and strong adhesive force and can be placed to fall off.
In this embodiment, the preparation process of the plant-based antifouling auxiliary agent is as follows:
27 parts of starch, 0.6 part of amylase and 85 parts of water are mixed and stirred for 2.5 hours at the temperature of 75 ℃, then 8 parts of alkali is added and stirred uniformly, 7 parts of hexadecyl trimethyl ammonium chloride is added and stirred for 12 minutes at the temperature of 90 ℃, then 11 parts of soybean phospholipid and 8 parts of cyclodextrin are added and stirred for 50 minutes, and the plant-based antifouling auxiliary agent is obtained after suction filtration, drying and crushing.
In the embodiment, the particle size of the plant-based antifouling auxiliary agent is 100 μm, so that the surface of a paint film can be ensured to be smooth, and meanwhile, the paint film is not too dense and poor in air permeability due to too small particle size.
The plant-based antifouling auxiliary agent disclosed by the invention has the characteristics that after starch is degraded by amylase, the starch is combined with soybean phospholipid in the presence of hexadecyl trimethyl ammonium chloride to be high in degree of combination, the stability is good, and the surface smoothness of a paint film can be improved by coating cyclodextrin on the surface, so that the plant-based antifouling auxiliary agent has the characteristics of good water resistance and good oil resistance.
The preparation method of the water-based paint for the building exterior wall comprises the following steps:
step one, mixing and dispersing the modified polyurethane acrylate dispersion, the plant-based antifouling auxiliary agent and water in a formula amount at 1000rpm/min for 13min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1600rpm/min for 25min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in the formula amount into the first mixture, and stirring and mixing at 1100rpm/min for 9min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 1000rpm/min for 9min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
Performance testing and results analysis
The water-based paints of examples 1 to 3 and comparative examples 1 to 5 were examined for flexibility, hardness, water-and oil-repellency, adhesion, and sound-insulating effect, wherein:
the flexibility of the paint film is measured by GB1731-79, the hardness of the paint film is measured by pencil hardness grade, and the adhesion of the paint film is measured by GB/T9286-1998.
And (3) detecting the waterproof performance: a plurality of aluminum alloy plates conforming to GB/T3880.1 are taken, the length and the width of each aluminum alloy plate are 18cm, examples 1-3 and comparative examples 1-5 are respectively rolled on each aluminum alloy plate in a roller mode, and the roller thickness is 0.15 mm. All aluminum alloy sheets subjected to roll coating were placed in a thermostat at a temperature of 25 ℃ and a humidity of 40% for 72 hours. And after 72h, taking out all the aluminum alloy plates, sequentially placing all the aluminum alloy plates on a placing table of a wettability meter, pouring 250ml of water with the temperature of 20 ℃ from a funnel of the wettability meter, and spraying the water on the surfaces of the aluminum alloy plates within 25-30 s. And after the spraying is finished, sequentially attaching the filter paper to the surface of each aluminum alloy plate sprayed with water, and judging the waterproof grade according to the condition that all the filter paper is soaked, wherein the grade standard is judged as shown in the table 1.
TABLE 1
| Water resistance rating | Filter paper wet condition |
| 0 | Both sides are completely wetted |
| 1 | One side is completely soaked |
| 2 | One surface is soaked by more than half part |
| 3 | One surface has a small number of discontinuous parts wetted |
| 4 | One side has very small amount of spot part soaked |
| 5 | Completely without wetting |
And (3) oil resistance detection: a plurality of aluminum alloy plates conforming to GB/T3880.1 are taken, the length and the width of each aluminum alloy plate are 18cm, examples 1-3 and comparative examples 1-5 are respectively rolled on each aluminum alloy plate in a roller mode, and the roller thickness is 0.15 mm. All aluminum alloy sheets subjected to roll coating were placed in a thermostat at a temperature of 25 ℃ and a humidity of 40% for 72 hours. After 72h, take out all aluminum alloy plate, place all aluminum alloy plate in proper order on being stained with the platform of placing of water degree appearance to pour one of them kind of test fluid of 20 ℃ of 250ml into from being stained with the funnel of water degree appearance, make fluid shower in the aluminum alloy plate surface in 30 ~ 35s, the shower finishes, pastes filter paper in proper order and applies on every aluminum alloy plate by the surface that fluid shower, is judged grease proofing grade according to the filter paper by the wet condition of fluid, grease proofing grade is judged as table 2. After one oil is tested, the oil resistance grade of the water-based paint to another oil is tested again according to the mode until the white mineral oil, the n-hexadecane, the n-tetradecane, the n-dodecane, the n-decane, the n-octane and the n-heptane are tested, and then the average value of the oil resistance grade of each oil to be tested is taken.
TABLE 2
| Oil repellency rating | Filter paper wet condition |
| 0 | Both sides are completely wetted |
| 1 | One side is completely soaked |
| 2 | One surface is soaked by more than half part |
| 3 | One surface has a small number of discontinuous parts wetted |
| 4 | One side has very small amount of spot part soaked |
| 5 | Completely without wetting |
The results of the performance tests of the aqueous paints of examples 1 to 3 and comparative examples 1 to 5 are shown in Table 3.
TABLE 3
And (4) analyzing results:
(1) from the test results of examples 1 to 3 in table 3, it can be seen that the water-based paint for exterior walls of buildings of the present application has excellent flexibility, hardness, water and oil repellency, adhesion, and sound insulation effects.
(2) Comparing the test results of comparative example 1 and example 1, it can be seen that the aqueous polyurethane acrylate dispersion of comparative example 1 is not modified with the nano silica powder dispersion as compared with the modified polyurethane acrylate dispersion of example 1, so that the paint film density of comparative example 1 is reduced, resulting in reduced water and oil resistance and reduced adhesion; and because the nano silica powder is beneficial to improving the hardness and flexibility of the aqueous polyurethane acrylate dispersion, the flexibility and hardness of the paint film of the comparative example 1 are lower than those of the paint film of the example 1.
(3) Comparing the test results of the comparative example 2 and the example 1, the plant-based antifouling auxiliary agent can obviously improve the water and oil resistance of the water-based paint and slightly improve the adhesion.
(4) Comparing the test results of comparative example 3 and example 1, it can be seen that the addition of the nano silica powder provides the water-based paint with excellent sound insulation effect, and can isolate more than half of the noise.
(5) Comparing the test results of comparative examples 4 to 5 with those of example 1, it can be seen that too small a particle size (0.01 μm) of the plant-based antifouling auxiliary causes the paint film to be too dense, so that the paint film has increased hardness but decreased flexibility and is prone to cracking; the particle size of the plant-based antifouling auxiliary agent is too large (100 mu m), the surface of a paint film has rough particles and is not smooth, so that the paint film is easy to fall off, and oil and water and other liquids are easy to permeate through the paint film, so that the adhesive force and the water and oil resistance of the paint film are reduced.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The water-based paint for the building exterior wall is characterized by comprising the following raw materials in parts by weight:
2. the water-based paint for the exterior wall of the building as claimed in claim 1, wherein: the wetting agent is water-based polyether modified siloxane with a short molecular chain segment, the defoaming agent is a water-based organic silicon defoaming agent, the thickening agent is at least one of an associated polyurethane thickening agent and a hydrophobically modified alkali swelling thickening agent, the film-forming assistant is a fatty acid ester film-forming assistant, and the dispersing agent is a carboxylate anionic surfactant.
3. The water-based paint for the exterior wall of the building as claimed in claim 1, wherein the modified polyurethane acrylate dispersion comprises the following raw materials in parts by weight:
4. the water-based paint for the exterior wall of a building, according to claim 3, wherein: the silane coupling agent is dimethyl dimethoxy silane or KH 550.
5. The water-based paint for the exterior wall of the building as claimed in claim 3, wherein the preparation method of the modified polyurethane acrylate dispersion comprises the following steps:
(1) dropwise adding the hydroxyl acrylate with the formula amount into the aqueous polyurethane dispersion liquid with the formula amount for polymerization reaction to obtain an aqueous polyurethane acrylate dispersion;
(2) dispersing the nano silicon oxide powder with the formula amount in deionized water with the formula amount, and stirring for 35-45 min at 30-40 ℃ to obtain nano silicon oxide powder dispersion liquid;
(3) and uniformly mixing the aqueous polyurethane acrylate dispersoid, the nano silicon oxide powder dispersion liquid and the silane coupling agent with the formula amount to obtain the modified polyurethane acrylate dispersoid.
6. The water-based paint for the exterior wall of the building as claimed in claim 1, wherein the preparation process of the plant-based anti-fouling assistant is as follows:
mixing and stirring 25-30 parts by weight of starch, 0.5-0.8 part by weight of amylase and 80-90 parts by weight of water at 70-80 ℃ for 2-3 hours, then adding 6-9 parts by weight of alkali and stirring uniformly, then adding 5-8 parts by weight of hexadecyl trimethyl ammonium chloride and stirring at 85-95 ℃ for 8-15 minutes, then adding 10-12 parts by weight of soybean lecithin and 6-10 parts by weight of cyclodextrin and stirring for 40-60 minutes, and performing suction filtration, drying and crushing to obtain the plant-based antifouling auxiliary agent.
7. The water-based paint for the exterior wall of the building as claimed in claim 6, wherein: the particle size of the plant-based antifouling auxiliary agent is 0.1-10 mu m.
8. The method for preparing the water-based paint for the exterior wall of the building as claimed in any one of claims 1 to 7, comprising the steps of:
step one, mixing and dispersing the modified polyurethane acrylate dispersoid, the plant-based antifouling auxiliary agent and water in a formula amount at 800-1200 rpm/min for 10-15 min, adding the nano magnesium oxide and the dispersing agent in the formula amount, and continuously stirring and dispersing at 1500-1700 rpm/min for 20-30 min to obtain a first mixture;
step two, adding a wetting agent and a defoaming agent in a formula amount into the first mixture, and stirring and mixing at 1000-1200 rpm/min for 8-10 min to obtain a second mixture;
and step three, dissolving the film-forming aid in the formula amount in water, slowly adding the dissolved film-forming aid into the second mixture, stirring and mixing at 800-1200 rpm/min for 8-10 min, and then adding the thickener to disperse uniformly to obtain the water-based paint for the building exterior wall.
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