CN115286985A - Double-component water-based environment-friendly coating - Google Patents
Double-component water-based environment-friendly coating Download PDFInfo
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- CN115286985A CN115286985A CN202210080233.1A CN202210080233A CN115286985A CN 115286985 A CN115286985 A CN 115286985A CN 202210080233 A CN202210080233 A CN 202210080233A CN 115286985 A CN115286985 A CN 115286985A
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- 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
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- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/773—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur halogens
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/778—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur silicon
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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
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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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
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- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
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Abstract
The scheme relates to a two-component water-based environment-friendly coating which comprises the following raw materials in parts by weight: 30-60 parts of water-oil universal hydroxy acrylic acid dispersoid, 15-35 parts of pigment and filler, 0.5-2 parts of wetting dispersant, 0.05-1 part of defoaming agent and 0.3-1.0 part of adhesion promoter; and (B) component: 20-30 parts of 4-fluorophenyl isocyanate and 20-40 parts of silicon modified isocyanate; when the two-component water-based environment-friendly coating is used, the component A and the component B are mixed according to the mass ratio of 3-5. The invention is an environment-friendly product of the water-based paint; according to the scheme, all components and the using amount in the formula are optimized, wherein a paint film with excellent breaking strength and tensile strength can be obtained by mutually matching the water-oil general hydroxyl acrylic acid dispersoid, the curing agent component and the pigment and filler; the coating with better performance can be obtained by modification based on common components, the preparation process is simple, and the cost is low; the paint has good compatibility and high storage stability.
Description
Technical Field
The invention relates to the technical field of coating preparation, in particular to a two-component water-based environment-friendly coating.
Background
The aqueous two-component polyurethane coating is formed by crosslinking an aqueous hydroxyl acrylic acid dispersoid with an aqueous isocyanate curing agent, and has excellent performances such as good flexibility, light and color retention, so that the aqueous hydroxyl acrylic acid dispersoid is rapidly popular in the market, most of the aqueous hydroxyl acrylic acid dispersoids in the market are matched with the aqueous isocyanate curing agent for use at present, and the aqueous two-component polyurethane coating has the advantages of good compatibility, high paint film gloss and the like. However, the properties such as aging resistance are not satisfactory, and therefore, it is necessary to modify the acrylic acid-polyurethane emulsion to obtain a high-performance acrylic acid-polyurethane emulsion having more excellent properties.
On one hand, the performance can be improved by adding various additives, but most of the oil additives have poor compatibility with the aqueous hydroxyl acrylic dispersion, so that the problems of low glossiness, non-transparent paint film, oil shrinkage of the paint film and the like are caused. On the other hand, the performance of the acrylic emulsion can also be improved by chemical modification of the acrylic dispersion, such as organic silicon, organic fluorine, nano materials and the like; but the increase of the preparation cost is more than the improvement of the effect; and certain defects exist in the improvement of the performance of the coating, the tensile strength, hardness and water absorption of the waterborne polyurethane coating film are increased, but the elongation at break is reduced along with the increase of the content of the modified material.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a two-component waterborne polyurethane coating which is based on a water-oil universal hydroxyl acrylic acid dispersoid, a modified isocyanate curing agent, a filler and the like, has a simple preparation method, and effectively improves the elongation at break of a polyurethane coating film.
In order to achieve the purpose, the invention provides the following technical scheme:
a two-component water-based environment-friendly coating comprises the following raw materials in parts by weight:
the component A is as follows: 30 to 60 portions of water-oil universal hydroxyl acrylic acid dispersoid, 15 to 35 portions of pigment and filler, 0.5 to 2 portions of wetting dispersant, 0.05 to 1 portion of defoamer and 0.3 to 1.0 portion of adhesion promoter;
and (B) component: 20-30 parts of 4-fluorophenyl isocyanate and 20-40 parts of silicon modified isocyanate;
when the two-component water-based environment-friendly coating is used, the component A and the component B are mixed according to the mass ratio of 3-5;
the water-oil universal hydroxy acrylic acid dispersoid is polymerized by 5-6% of alcohol ether solvent, 1-3% of reactive emulsifier, 1-2% of vinyl monomer, 26-31% of functional monomer, 7-10% of organic acid reactive monomer, 1.2-1.4% of initiator and the balance of deionized water accounting for 100% of the total feeding mass ratio; the reactive emulsifier is selected from one or a combination of any of allyl sulfate, vinyl sulfate and polyoxyethylene ether sulfate;
the pigment and filler comprises talcum powder, calcium carbonate, mica powder and modified nano titanium dioxide, and the mass ratio is (1).
Preferably, the water-oil universal type hydroxy acrylic acid dispersion is prepared by the following steps:
1) Adding an alcohol ether solvent, a reactive emulsifier and an active diluent into a four-neck flask with condensation, and heating to 135-145 ℃;
2) Mixing 80% of vinyl monomer, functional monomer and 80% of initiator to obtain a solution A, and slowly dripping the solution A into the four-neck flask obtained in the step 1) within 5-6 h;
3) Weighing organic acid reaction type monomers quantitatively, mixing the organic acid reaction type monomers with the rest 20% of vinyl monomers and 20% of initiator to obtain a solution B, and continuously dropwise adding the solution B into the four-neck flask within 1.5-2h after the dropwise adding in the step 2) is finished;
4) After the dropwise addition is finished, adding an initiator, and continuously preserving the heat for 1.5 hours at the temperature of 135-145 ℃;
5) Cooling, adding a neutralizer, slowly dropwise adding deionized water, stirring and dispersing, and then discharging;
wherein, the reactive emulsifier is selected from one or any combination of allyl sulfate, vinyl sulfate and polyoxyethylene ether sulfate.
Preferably, the reactive diluent is selected from one or any combination of polyester polyol, polycaprolactone polyol and polycarbonate polyol.
Preferably, the vinyl monomer is selected from one or a combination of methyl (meth) acrylate, benzyl (meth) acrylate, styrene, isooctyl (meth) acrylate and lauryl (meth) acrylate.
Preferably, the functional monomer is hydroxyethyl (meth) acrylate or hydroxypropyl (meth) acrylate.
Preferably, the organic acid type reactive monomer is sodium vinyl sulfate, sodium propenyl sulfate or sodium polyoxyethylene sulfate. The solvent is selected from one or more of ethylene glycol butyl ether, propylene glycol methyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, propylene glycol methyl ether acetate and ethylene glycol methyl ether acetate.
Preferably, the preparation process of the silicon modified isocyanate comprises the following steps: adding 1 equivalent of KH550, a catalytic amount of stannic chloride and a solvent n-heptane into a reaction bottle, heating to 60 ℃, dropwise adding an n-heptane solution containing 0.5 equivalent of hexamethylene diisocyanate, carrying out heat preservation reaction for 3h after dropwise adding is finished, and evaporating to remove the solvent after the reaction is finished.
Preferably, the preparation process of the modified nano titanium dioxide comprises the following steps:
weighing a certain mass of titanium dioxide powder, soaking for 60min under an acidic condition, washing with water to be neutral, then heating to 35 ℃, carrying out ultrasonic treatment for 30min under 90W of ultrasonic power, then transferring to a stirring reaction kettle, controlling the temperature to be 35 ℃, and keeping the pH value to be neutral;
and (3) mixing the phosphate betaine and absolute ethyl alcohol, dropwise adding the mixture into the stirring reaction kettle under the stirring condition, stirring the mixture at the constant temperature of 80 ℃ for 2 hours after the dropwise adding is finished, and carrying out reduced pressure suction filtration to obtain the product.
Preferably, the amount of the phosphate-based betaine is 2% by mass of the titanium dioxide powder.
The two-component waterborne polyurethane coating adopts the self-made water-oil universal hydroxy acrylic acid dispersoid, has a good emulsifying effect, has high emulsion stability, and is suitable for multi-system coatings; has good compatibility with an oily curing agent.
The component B is a curing agent component, 4-fluorophenyl isocyanate and silicon modified isocyanate are adopted, and the fluorine-silicon modified isocyanate can effectively improve the water resistance, solvent resistance and heat resistance of the coating film; on the other hand, when the modified epoxy resin is mixed with the aqueous oil general-purpose hydroxyl acrylic acid dispersion, the problem of poor compatibility of the traditional dispersion can be avoided, so that the fracture strength and tensile strength performance of a coating film can be effectively balanced, the fracture elongation of the coating film can be improved, and the aging resistance can be further improved.
The pigment and the filler are important components in the coating and are used for endowing the coating film with properties of hiding power, enhancing the mechanical strength of the coating film and the like. The talcum powder, the calcium carbonate, the mica powder and the titanium dioxide which are selected in the scheme are common pigment fillers, and in order to further enhance the compatibility of a coating system, the titanium dioxide is simply modified, the specific surface area and the number of pores of the titanium dioxide after acidification and ultrasonic treatment are improved, and then the surface treatment of phosphate-based betaine is carried out, so that the agglomeration of the titanium dioxide is reduced, the dispersibility and the wettability of the titanium dioxide are improved, and the compatibility stability between the water-oil general hydroxyl acrylic acid dispersoid and a curing agent of a mixed component is further improved.
The beneficial effects of the invention are: the invention is a water-based paint, reduces the usage amount of volatile solvent, and is an environment-friendly product; all components and the using amount in the formula are optimized, wherein a paint film with excellent tensile strength and elongation at break can be obtained by the mutual matching of the water-oil universal hydroxy acrylic acid dispersoid, the curing agent component and the pigment and filler; the coating with better performance can be obtained by modification based on common components, the preparation process is simple, and the cost is low; the paint has good compatibility and high storage stability.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A two-component water-based environment-friendly coating comprises the following raw materials in parts by weight:
the component A is as follows: 30 to 60 portions of water-oil universal hydroxyl acrylic acid dispersoid, 15 to 35 portions of pigment and filler, 0.5 to 2 portions of wetting dispersant, 0.05 to 1 portion of defoamer and 0.3 to 1.0 portion of adhesion promoter;
and (B) component: 20-30 parts of 4-fluorophenyl isocyanate and 20-40 parts of silicon modified isocyanate;
when the two-component water-based environment-friendly coating is used, the component A and the component B are mixed according to the mass ratio of 3-5;
wherein, the pigment filler comprises talcum powder, calcium carbonate, mica powder and modified nano titanium dioxide, and the mass ratio is 1.
The water-oil universal hydroxy acrylic acid dispersoid comprises the following components in percentage by weight: the solvent, the reactive emulsifier, the reactive diluent, the vinyl monomer, the functional monomer, the organic acid reactive monomer, the initiator and the neutralizer respectively account for 5-6%, 1-3%, 1-2%, 26-31%, 7-10%, 1.2-1.4%, 1.4-1.6%, 1.4-2.4% of the total feeding mass ratio, and the balance is deionized water, and the total mass ratio is 100%.
1) Adding a quantitative weighed solvent, a reaction type emulsifier and a reactive diluent into a four-neck flask with condensation, and heating to 135-145 ℃;
2) Weighing 80% of vinyl monomer, 80% of functional monomer and 80% of initiator quantitatively, mixing to obtain a solution A, and slowly dripping the solution A into the four-neck flask obtained in the step 1) within 5-6 hours;
3) Weighing organic acid reaction type monomers quantitatively, mixing the organic acid reaction type monomers with the rest 20% of vinyl type monomers and 20% of initiator to obtain a solution B, continuously dripping the solution B into the four-neck flask within 1.5-2h after the dripping in the step 2) is finished,
4) After the dropwise addition is finished, adding an initiator, and continuously preserving the heat for 1.5 hours at the temperature of 135-145 ℃;
6) And cooling, adding a neutralizing agent, slowly dropwise adding deionized water, stirring and dispersing, and then discharging.
According to the above preparation process, the following specific samples can be prepared by substituting specific amounts of raw materials.
Sample 1: 6g of propylene glycol butyl ether, 1.5g of sodium allyl sulfate, 1.5g of polyester polyol, 13.3g of methyl methacrylate, 10g of isooctyl acrylate, 7g of hydroxyethyl methacrylate, 5g of benzyl methacrylate, 2.5g of lauryl methacrylate, 1.2g of acrylic acid, 1.3g of tert-amyl peroxybenzoate and 2.3g of triethanolamine, and the balance of deionized water, wherein the total amount is 100g.
Sample 2: 7g of propylene glycol methyl ether, 1g of sodium polyoxyethylene ether sulfate, 1.5g of polyester polyol, 12.8g of methyl methacrylate, 10g of isooctyl acrylate, 7.5g of hydroxyethyl methacrylate, 4.5g of benzyl methacrylate, 2.5g of lauryl methacrylate, 1.2g of methacrylic acid, 1.4g of tert-butyl peroxyacetate, 1.5g of AMP-95, and the balance of deionized water, and the total amount is 100g.
Sample 3: 7g of dipropylene glycol methyl ether, 1.5g of polyoxyethylene ether sodium sulfate, 1g of polycarbonate polyol, 12.8g of methyl methacrylate, 10g of isooctyl acrylate, 7.5g of hydroxyethyl methacrylate, 4.5g of benzyl methacrylate, 2.5g of lauryl methacrylate, 100.2 g of PAM, 1.4g of tert-butyl peroxyacetate, 1.5g of triethylamine and the balance of deionized water, and the total is 100g.
The preparation process of the silicon modified isocyanate comprises the following steps:
adding 1 equivalent of KH550, a catalytic amount of stannic chloride and a solvent n-heptane into a reaction bottle, heating to 60 ℃, dropwise adding an n-heptane solution containing 0.5 equivalent of hexamethylene diisocyanate, keeping the temperature for reaction for 3 hours after dropwise adding is finished, and evaporating to remove the solvent after the reaction is finished.
The preparation process of the modified nano titanium dioxide comprises the following steps:
weighing a certain mass of titanium dioxide powder, soaking for 60min under an acidic condition, washing with water to be neutral, then heating to 35 ℃, carrying out ultrasonic treatment for 30min under 90W of ultrasonic power, then transferring to a stirring reaction kettle, controlling the temperature to be 35 ℃, and keeping the pH value to be neutral;
mixing 2% of phosphate betaine (based on the mass of titanium dioxide powder) and absolute ethyl alcohol, dropwise adding into the stirring reaction kettle while stirring, stirring at 80 deg.C for 2 hr, and vacuum filtering.
The preparation process of the two-component waterproof coating comprises the following steps:
mixing the following components in the component A:30 to 60 portions of water-oil general hydroxyl acrylic acid dispersoid, 15 to 35 portions of pigment and filler, 0.5 to 2 portions of wetting dispersant, 0.05 to 1 portion of defoamer and 0.3 to 1.0 portion of adhesion promoter are sequentially added into a reaction kettle, stirred and heated to 60 ℃,
and (3) mixing the components B: 20-30 parts of 4-fluorophenyl isocyanate and 20-40 parts of silicon modified isocyanate are stirred to be mixed
Example 1:
the component A is as follows: 30 parts of sample 1, 15 parts of pigment and filler (talc powder, calcium carbonate, mica powder and modified nano titanium dioxide, the mass ratio is 1;
and (B) component: 20 parts of 4-fluorophenyl isocyanate and 30 parts of silicon modified isocyanate;
the mass ratio of the component A to the component B is 3.5.
Example 2:
the component A is as follows: 40 parts of sample 2, 20 parts of pigment and filler (talc powder, calcium carbonate, mica powder and modified nano titanium dioxide, the mass ratio is 1;
and (B) component: 25 parts of 4-fluorophenyl isocyanate and 25 parts of silicon modified isocyanate;
the mass ratio of the component A to the component B is 4.
Example 3:
the component A is as follows: 50 parts of a sample 3, 30 parts of pigment and filler (talc powder, calcium carbonate, mica powder and modified nano titanium dioxide, the mass ratio of 1;
and (B) component: 30 parts of 4-fluorophenyl isocyanate and 30 parts of silicon modified isocyanate;
the mass ratio of the component A to the component B is 4.
Comparative example 1:
the component A is as follows: 50 parts of a sample 3, 30 parts of pigment and filler (talc powder, calcium carbonate, mica powder and titanium dioxide in a mass ratio of 1;
and (B) component: 30 parts of 4-fluorophenyl isocyanate and 30 parts of silicon modified isocyanate;
the mass ratio of the component A to the component B is 4.
Comparative example 2:
the component A is as follows: 50 parts of a sample 3, 30 parts of pigment and filler (talc powder, calcium carbonate, mica powder and modified nano titanium dioxide, the mass ratio is 1;
and (B) component: 60 parts of diphenylmethane diisocyanate;
the mass ratio of the component A to the component B is 4.
Comparative example 3:
the component A is as follows: 50 parts of a commercially available hydroxyl acrylic acid dispersoid, 30 parts of pigment and filler (talc powder, calcium carbonate, mica powder and modified nano titanium dioxide, the mass ratio is 1;
and (B) component: 60 parts of diphenylmethane diisocyanate;
the mass ratio of the component A to the component B is 4.
Uniformly mixing the component A and the component B according to the mass ratio to obtain the water-based double-component polyurethane coating; water was added to dilute to a viscosity suitable for spray application, sprayed onto the substrate at room temperature, and baked at 80 ℃ for 8h, and the properties of the paint film were tested and reported in table 1.
TABLE 1
As can be seen from Table 1, the water-oil universal hydroxy acrylic acid dispersoid can be successfully prepared by adopting the method of the invention, the prepared dispersoid has better compatibility with a curing agent and pigment and filler, the stability after forming the coating is high, the dispersoid prepared in the examples 1-3 has better advantages in all properties by combining the comparison of a plurality of experimental data, and the comparative examples 1-3 show that the lack of any component can cause the reduction of the performance of the coating.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (9)
1. The two-component water-based environment-friendly coating is characterized by comprising the following raw materials in parts by weight:
the component A is as follows: 30-60 parts of water-oil universal hydroxy acrylic acid dispersoid, 15-35 parts of pigment and filler, 0.5-2 parts of wetting dispersant, 0.05-1 part of defoaming agent and 0.3-1.0 part of adhesion promoter;
and (B) component: 20-30 parts of 4-fluorophenyl isocyanate and 20-40 parts of silicon modified isocyanate;
when the two-component water-based environment-friendly coating is used, the component A and the component B are mixed according to the mass ratio of 3-5;
the water-oil universal hydroxy acrylic acid dispersoid is polymerized by 5-6% of alcohol ether solvent, 1-3% of reactive emulsifier, 1-2% of vinyl monomer, 26-31% of functional monomer, 7-10% of organic acid reactive monomer, 1.2-1.4% of initiator and the balance of deionized water accounting for 100% of the total feeding mass ratio; the reactive emulsifier is selected from one or a combination of any of allyl sulfate, vinyl sulfate and polyoxyethylene ether sulfate;
the pigment and filler comprises talcum powder, calcium carbonate, mica powder and modified nano titanium dioxide, and the mass ratio is 1.
2. The two-component aqueous environmentally friendly coating of claim 1, wherein the water-oil universal hydroxyacrylic dispersion is prepared by the following steps:
1) Adding an alcohol ether solvent, a reactive emulsifier and an active diluent into a four-neck flask with condensation, and heating to 135-145 ℃;
2) Mixing 80% of vinyl monomer, functional monomer and 80% of initiator to obtain a solution A, and slowly dripping the solution A into the four-neck flask obtained in the step 1) within 5-6 h;
3) Weighing organic acid reaction type monomers quantitatively, mixing the organic acid reaction type monomers with the rest 20% of vinyl monomers and 20% of initiator to obtain a solution B, and continuously dropwise adding the solution B into the four-neck flask within 1.5-2h after the dropwise adding in the step 2) is finished;
4) After the dropwise addition is finished, adding an initiator, and continuously preserving the heat for 1.5h at the temperature of 135-145 ℃;
5) Cooling, adding a neutralizing agent, slowly dropwise adding deionized water, stirring and dispersing, and then discharging;
wherein, the reactive emulsifier is selected from one or a combination of any of allyl sulfate, vinyl sulfate and polyoxyethylene ether sulfate.
3. The two-component aqueous environment-friendly coating material of claim 1, wherein the reactive diluent is selected from one or any combination of polyester polyol, polycaprolactone polyol and polycarbonate polyol.
4. The two-component aqueous environmental protection coating according to claim 1, wherein the vinyl monomer is selected from one or more of methyl (meth) acrylate, benzyl (meth) acrylate, styrene, isooctyl (meth) acrylate, lauryl (meth) acrylate.
5. The two-component aqueous environmental-friendly coating material according to claim 1, wherein the functional monomer is hydroxyethyl (meth) acrylate or hydroxypropyl (meth) acrylate.
6. The two-component aqueous environmental protection coating of claim 1, wherein the organic acid reactive monomer is sodium vinyl sulfate, sodium propenyl sulfate, or sodium polyoxyethylene sulfate.
7. The two-component aqueous environment-friendly coating material of claim 1, wherein the preparation process of the silicon-modified isocyanate comprises the following steps: adding 1 equivalent of KH550, a catalytic amount of stannic chloride and a solvent n-heptane into a reaction bottle, heating to 60 ℃, dropwise adding an n-heptane solution containing 0.5 equivalent of hexamethylene diisocyanate, carrying out heat preservation reaction for 3h after dropwise adding is finished, and evaporating to remove the solvent after the reaction is finished.
8. The two-component aqueous environment-friendly coating as claimed in claim 1, wherein the preparation process of the modified nano titanium dioxide comprises the following steps:
weighing a certain mass of titanium dioxide powder, soaking for 60min under an acidic condition, washing with water to be neutral, then heating to 35 ℃, carrying out ultrasonic treatment for 30min under 90W of ultrasonic power, then transferring to a stirring reaction kettle, controlling the temperature to be 35 ℃, and keeping the pH value to be neutral;
and (3) mixing the phosphate betaine and absolute ethyl alcohol, dropwise adding the mixture into the stirring reaction kettle under the stirring condition, stirring the mixture at the constant temperature of 80 ℃ for 2 hours after the dropwise adding is finished, and carrying out reduced pressure suction filtration to obtain the product.
9. The two-component aqueous environmental protection coating of claim 8, wherein the amount of said phosphate-based betaine is 2% based on the mass of the titanium dioxide powder.
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