CN109897520B - Water-based acrylic polyurethane coating for modified car and preparation method thereof - Google Patents
Water-based acrylic polyurethane coating for modified car and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a water-based acrylic polyurethane coating for a modified car and a preparation method thereof, belonging to the technical field of coatings. According to the water-based acrylic polyurethane coating, the titanium dioxide modified nano graphene is added into the ingredient A, and the synergistic effect between the nano titanium dioxide and the nano graphene is utilized, so that the acid resistance, alkali resistance and ultraviolet resistance of the water-based acrylic polyurethane coating are improved, the requirement of modifying the water-based acrylic polyurethane coating is met, and meanwhile, the water-based acrylic polyurethane coating has the advantages of simple preparation method, economy and practicability, the mixture is ground, and the fineness and the smoothness of the water-based acrylic polyurethane coating are improved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based acrylic polyurethane coating for a modified car and a preparation method thereof.
Background
With the increasing importance of the country on environmental protection, the water-based paint should be transported and developed. Because the water-based paint takes water as a dispersion medium, the content of volatile organic compounds is greatly reduced, and the pollution to the environment is reduced, so the water-based paint is more and more valued by people.
At present, patent application publication No. CN107523203A, application publication No. 2017.12.29, discloses a two-component water-based acrylic polyurethane coating and a preparation method thereof, wherein the two-component water-based acrylic polyurethane coating comprises a main agent and a curing agent, the main agent comprises a water-based hydroxyl acrylic acid dispersoid, a defoaming agent, a dispersing agent, a wetting agent, titanium dioxide, carbon black, deionized water, a cosolvent, an anti-explosion agent and a thickening agent, and the curing agent comprises a water-based polyisocyanate curing agent, PMA and DMM, and the two-component water-based acrylic polyurethane coating is obtained by mixing and stirring. The VOC of the two-component water-based acrylic polyurethane coating can be controlled below 110g/L under construction conditions, and the two-component water-based acrylic polyurethane coating can replace the traditional solvent type polyurethane coating, but because the acid and alkali resistance and the ultraviolet resistance are poor, the modified car is influenced by wind, sun and rain for a long time, and the requirement of the modified car water-based coating cannot be met.
Disclosure of Invention
The invention aims to provide a water-based acrylic polyurethane coating for a modified car, which improves the acid and alkali resistance and ultraviolet resistance of the water-based acrylic polyurethane coating by adding titanium dioxide modified nano-graphene into a material A and by the synergistic effect between the nano-titanium dioxide and the nano-graphene, and meets the requirement of the water-based coating for the modified car.
The technical purpose of the invention is realized by the following technical scheme:
the water-based acrylic polyurethane coating for the modified car comprises a material A, a material B and deionized water, wherein the material A comprises 65-100 parts of water-based hydroxyl acrylic dispersoid, 8-14 parts of titanium dioxide modified nano-graphene, 6.5-9.2 parts of butanol, 20-24 parts of talcum powder, 5-7 parts of pigment, 1.5-2.5 parts of dispersing agent, 1.8-2.8 parts of defoaming agent, 2-3.5 parts of base material wetting agent, 4-6 parts of thickening agent and 0.7-1.1 part of film-forming additive by weight, and the weight of the titanium dioxide accounts for 12-20% of the total weight of the titanium dioxide modified nano-graphene; the ingredient B is a water-based polyisocyanate curing agent; the weight ratio of the ingredient A to the ingredient B to the deionized water is (10-50) to (10) (0.4-1.8).
By adopting the technical scheme, through the synergistic effect among the raw materials in the ingredient A and the synergistic effect between the nano titanium dioxide and the nano graphene, the diffusion path inside the water-based acrylic polyurethane coating is reduced, the sterilization effect is achieved, the influence of ultraviolet rays on the water-based acrylic polyurethane coating is reduced, the acid and alkali resistance and the ultraviolet ray resistance of the water-based acrylic polyurethane coating are improved, the pencil hardness of the water-based acrylic polyurethane coating is improved, and the requirement of refitting the water-based acrylic coating is met.
Preferably, the ingredient A comprises 75-95 parts of aqueous hydroxy acrylic acid dispersoid, 10-12 parts of titanium dioxide modified nano-graphene, 7.5-8.5 parts of butanol, 21-23 parts of talcum powder, 5.5-6.5 parts of pigment, 1.7-2.2 parts of dispersing agent, 2-2.5 parts of defoaming agent, 2.4-3 parts of base material wetting agent, 4.5-5.5 parts of thickening agent and 0.8-1 part of film-forming auxiliary agent, wherein the weight of titanium dioxide accounts for 14-18% of the total weight of the titanium dioxide modified nano-graphene, the ingredient B is aqueous polyisocyanate curing agent, and the weight ratio of the ingredient A, the ingredient B and deionized water is (22-33) to 10 (0.8-1.5).
By adopting the technical scheme, the raw material proportion of the water-based acrylic polyurethane coating is further optimized, and the performance of the water-based acrylic polyurethane coating is further improved.
Preferably, the defoamer is a polyether siloxane copolymer, the coalescing agent is ethylene glycol monobutyl ether, and the substrate wetting agent is alkyl aryl polyether.
By adopting the technical scheme, the defoaming agent, the film forming additive and the substrate wetting agent are further optimized, and the practicability of the water-based acrylic polyurethane coating is improved.
More preferably, the pigment is one or more of titanium dioxide, phthalocyanine blue, carbon black, medium chrome yellow and iron oxide red.
By adopting the technical scheme, the pigment can be selected according to the requirement, and the practicability of the water-based acrylic polyurethane coating is improved.
More preferably, the titanium dioxide modified nano-graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 35-60min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 20-40min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 1-3h at the temperature of 85-95 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene.
By adopting the technical scheme, the titanium dioxide modified nano-graphene is prepared under the conditions of continuous stirring and ultrasound, and the dispersibility of nano-titanium dioxide and nano-graphite oxide is improved, so that the performance of the titanium dioxide modified nano-graphene is improved.
More preferably, the raw materials of the ingredient A are also added with a corrosion inhibitor, and the weight of the corrosion inhibitor accounts for 3-5% of the total weight of the ingredient A.
By adopting the technical scheme, the corrosion inhibitor is added into the ingredient A, so that the storage stability and the service life of the water-based acrylic polyurethane coating are improved.
More preferably, the corrosion inhibitor is zinc phosphomolybdate.
By adopting the technical scheme, the corrosion inhibitor is further optimized, and the practicability of the water-based acrylic polyurethane coating is improved.
The second purpose of the present invention is to provide a method for preparing the above-mentioned water-based acrylic polyurethane coating for modified cars, which has the advantages of simple preparation method, economy and practicality, and simultaneously, the mixture is ground, so that the fineness and the smoothness of the water-based acrylic polyurethane coating are improved.
The technical purpose of the invention is realized by the following technical scheme:
a method for preparing the water-based acrylic polyurethane coating for the refitted vehicle comprises the following steps:
(1) adding butanol, a dispersing agent, a defoaming agent and a base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 15-30 μm;
(3) adding a thickening agent and a film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a material A;
(4) and adding the ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
By adopting the technical scheme, the raw materials of the ingredient A are mixed step by step, and then the ingredient A, the ingredient B and the deionized water are mixed, so that the water-based acrylic polyurethane coating has the advantages of simple preparation method, economy and practicality.
More preferably, the titanium dioxide modified nano-graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 35-60min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 20-40min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 1-3h at the temperature of 85-95 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene.
By adopting the technical scheme, the titanium dioxide modified nano-graphene is prepared under the conditions of continuous stirring and ultrasound, and the dispersibility of nano-titanium dioxide and nano-graphite oxide is improved, so that the performance of the titanium dioxide modified nano-graphene is improved.
The third purpose of the invention is to provide a method for preparing the water-based acrylic polyurethane coating for the modified car, which has the advantages of simple preparation method, economy and practicability, and improves the fineness and smoothness of the water-based acrylic polyurethane coating by grinding the mixture.
The technical purpose of the invention is realized by the following technical scheme:
a method for preparing the water-based acrylic polyurethane coating for the refitted vehicle comprises the following steps:
(1) adding butanol, a dispersing agent, a defoaming agent and a base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 15-30 μm;
(3) adding a corrosion inhibitor, a thickening agent and a film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a material A;
(4) and adding the ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
By adopting the technical scheme, the raw materials of the ingredient A are mixed step by step, and then the ingredient A, the ingredient B and the deionized water are mixed, so that the water-based acrylic polyurethane coating has the advantages of simple preparation method, economy and practicality.
In conclusion, the invention has the following beneficial effects:
according to the water-based acrylic polyurethane coating for the modified car, the titanium dioxide modified nano graphene is added into the ingredient A, and the acid and alkali resistance and the ultraviolet resistance of the water-based acrylic polyurethane coating are improved through the synergistic effect between the nano titanium dioxide and the nano graphene, so that the requirement of the water-based coating for the modified car is met.
And secondly, the titanium dioxide modified nano-graphene is prepared under the conditions of continuous stirring and ultrasound, so that the dispersibility of the nano-titanium dioxide and the nano-graphite oxide is improved, and the performance of the titanium dioxide modified nano-graphene is improved.
Thirdly, the storage stability and the service life of the water-based acrylic polyurethane coating are improved by adding the corrosion inhibitor into the ingredient A.
Fourthly, the method for modifying the water-based acrylic polyurethane coating of the vehicle has the advantages of simple preparation method, economy and practicability, and improves the fineness and the smoothness of the water-based acrylic polyurethane coating by grinding the mixture.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the preparation methods described in the examples are only for illustrating the present invention and are not to be construed as limiting the present invention, and that the simple modifications of the preparation methods of the present invention based on the concept of the present invention are within the scope of the present invention as claimed.
Ingredient A in the example of Table 1
TABLE 2 contents (unit: Kg) of the respective raw materials in the examples
| Examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Ingredient A | 10 | 33 | 30 | 22 | 50 | 30 | 30 | 30 |
| Ingredient B | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Deionized water | 0.4 | 1.5 | 1.2 | 0.8 | 1.8 | 1.2 | 1.2 | 1.2 |
Example 1
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersant, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether substrate wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and phthalocyanine blue pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 15 mu m;
(3) adding an aqueous nonionic associative polyurethane thickener and an ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a mixture A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 35min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 40min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 1h at the temperature of 95 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 12% of the total weight of the titanium dioxide modified nano graphene.
Example 2
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersant, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether substrate wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and medium chrome yellow pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 24 mu m;
(3) adding an aqueous nonionic associative polyurethane thickener and an ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a mixture A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 55min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 25min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 1.5h at the temperature of 92 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 14% of the total weight of the titanium dioxide modified nano graphene.
Example 3
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersing agent, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and titanium dioxide pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 20 mu m;
(3) adding an aqueous nonionic associative polyurethane thickener and an ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a mixture A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 50min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 30min, adding hydrazine hydrate and concentrated ammonia water, stirring and uniformly mixing, reacting for 2h at the temperature of 90 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 16% of the total weight of the titanium dioxide modified nano graphene.
Example 4
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersing agent, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and carbon black pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 18 mu m;
(3) adding an aqueous nonionic associative polyurethane thickener and an ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a mixture A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 40min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 35min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 2.5h at the temperature of 88 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 18% of the total weight of the titanium dioxide modified nano graphene.
Example 5
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersant, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether substrate wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and iron oxide red pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 30 mu m;
(3) adding an aqueous nonionic associative polyurethane thickener and an ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a mixture A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 60min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 20min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 3h at the temperature of 85 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 20% of the total weight of the titanium dioxide modified nano graphene.
Example 6
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersing agent, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and titanium dioxide pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 20 mu m;
(3) adding a zinc phosphomolybdate corrosion inhibitor, a water-based nonionic associative polyurethane thickener and a ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring, uniformly dispersing and filtering to obtain a material A, wherein the weight of the zinc phosphomolybdate corrosion inhibitor accounts for 3% of the total weight of the material A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 50min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 30min, adding hydrazine hydrate and concentrated ammonia water, stirring and uniformly mixing, reacting for 2h at the temperature of 90 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 16% of the total weight of the titanium dioxide modified nano graphene.
Example 7
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersing agent, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and titanium dioxide pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 20 mu m;
(3) adding a zinc phosphomolybdate corrosion inhibitor, a water-based nonionic associative polyurethane thickener and a ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a material A, wherein the weight of the zinc phosphomolybdate corrosion inhibitor accounts for 4% of the total weight of the material A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 50min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 30min, adding hydrazine hydrate and concentrated ammonia water, stirring and uniformly mixing, reacting for 2h at the temperature of 90 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 16% of the total weight of the titanium dioxide modified nano graphene.
Example 8
The water-based acrylic polyurethane coating for the modified car comprises the following raw materials in proportion as shown in tables 1 and 2;
(1) adding butanol, a non-ionic acrylic high-molecular polymer dispersing agent, a polyether siloxane copolymer defoaming agent and an alkyl aryl polyether base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and titanium dioxide pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 20 mu m;
(3) adding a zinc phosphomolybdate corrosion inhibitor, a water-based nonionic associative polyurethane thickener and a ethylene glycol monobutyl ether film-forming aid into the ground mixture, stirring, uniformly dispersing and filtering to obtain a material A, wherein the weight of the zinc phosphomolybdate corrosion inhibitor accounts for 5% of the total weight of the material A;
(4) and adding a water-based polyisocyanate curing agent ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
The titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 50min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 30min, adding hydrazine hydrate and concentrated ammonia water, stirring and uniformly mixing, reacting for 2h at the temperature of 90 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene, wherein the weight of the titanium dioxide accounts for 16% of the total weight of the titanium dioxide modified nano graphene.
Comparative example 1
The water-based acrylic polyurethane coating is prepared by adopting a two-component water-based acrylic polyurethane coating disclosed by patent application publication No. CN107523203A with application publication No. 2017.12.29 and a preparation method thereof.
Comparative example 2
The difference between the comparative example 2 and the example 3 is that the titanium dioxide modified nano graphene is not added in the ingredient A.
Comparative example 3
The difference between comparative example 3 and example 3 is that the titanium dioxide modified nano-graphene is replaced by nano-titanium dioxide in the ingredient a.
Comparative example 4
The difference between comparative example 4 and example 3 is that the titanium dioxide modified nano-graphene was replaced with nano-graphene in formulation a.
Comparative example 5
The comparative example 5 and the example 3 are different in that the weight of the titanium dioxide in the formula A accounts for 11% of the total weight of the titanium dioxide modified nano graphene.
Comparative example 6
The comparative example 6 and the example 3 are different in that the weight of the titanium dioxide in the formula A accounts for 21% of the total weight of the titanium dioxide modified nano graphene.
Comparative example 7
The difference between the comparative example 7 and the example 3 is that the titanium dioxide modified nano graphene is prepared by only stirring and mixing without ultrasonic dispersion.
The following property tests were carried out on the aqueous acrylic urethane coatings for refitted vehicles obtained in examples 1 to 8 and comparative examples 1 to 7, and the test results are shown in Table 3.
TABLE 3 test results
As can be seen from Table 3, according to the water-based acrylic polyurethane coating for the modified car, the titanium dioxide modified nano-graphene is added into the ingredient A, and the nano-graphene and the titanium dioxide are synergistically acted, so that the water-based acrylic polyurethane coating stably exists for 810 hours in an environment with 5% of hydrochloric acid, stably exists for 850 hours in an environment with 5% of sodium hydroxide, and stably exists for 980 hours in an environment with direct ultraviolet irradiation, the acid and alkali resistance and the ultraviolet resistance of the water-based coating are improved, and the requirement of modifying the water-based coating for the car is met.
By comparing example 3 with comparative example 1, the comparative example 1 and example 3 are different in that the comparative example 1 is prepared by using a two-component water-based acrylic polyurethane coating disclosed by patent application publication No. CN107523203A with application publication No. 2017.12.29 and application publication No. CN107523203A to obtain a water-based acrylic polyurethane coating, and thus it can be seen that the water-based acrylic polyurethane coating of the present invention not only improves the acid-base resistance and ultraviolet resistance of the water-based acrylic polyurethane coating, but also improves pencil hardness and adhesion thereof.
By comparing example 3 with comparative examples 2 to 4, comparative example 2 and example 3 are distinguished in that no titanium dioxide modified nanographene is added to the ingredient a; the comparative example 3 is different from the example 3 in that the titanium dioxide modified nano graphene is replaced by nano titanium dioxide in the ingredient A; the difference between the comparative example 4 and the example 3 is that the titanium dioxide modified nano graphene is replaced by the nano graphene in the ingredient A, so that the nano titanium dioxide modified graphene improves the performance of the water-based acrylic polyurethane coating, the nano graphene reduces the diffusion path inside the water-based acrylic polyurethane coating, improves the corrosion resistance of the water-based acrylic polyurethane coating, and simultaneously has certain catalytic performance under the irradiation of ultraviolet rays, so that the effect of sterilization and disinfection is achieved, the influence of ultraviolet rays on the water-based acrylic polyurethane coating is reduced, the aging resistance of the water-based acrylic polyurethane coating is improved, and the synergistic effect between the nano titanium dioxide and the nano graphene is enhanced through the synergistic effect between the nano titanium dioxide and the nano graphene, so that the pencil hardness, the acid and alkali resistance and the ultraviolet resistance of the water-based coating are improved, and the requirement of modifying the water-based coating for vehicles is met.
By comparing example 3 with comparative examples 5 and 6, comparative example 5 differs from example 3 in that the weight of titanium dioxide in the formulation a accounts for 11% of the total weight of the titanium dioxide-modified nanographene; the comparative example 6 is different from the example 3 in that the weight of the titanium dioxide in the ingredient a accounts for 21% of the total weight of the titanium dioxide modified nano-graphene, and thus it can be seen that when the content of the titanium dioxide in the titanium dioxide modified nano-graphene is reduced or increased, the performance of the aqueous acrylic polyurethane coating is reduced, mainly because the content of the titanium dioxide is too low and cannot achieve the expected effect, and the content of the titanium dioxide is too high and the titanium dioxide is agglomerated and the active sites are reduced, so that the content of the titanium dioxide in the titanium dioxide nano-graphene is 12-20%, and the performance of the titanium dioxide modified nano-graphene is the best.
By comparing example 3 with comparative example 7, and comparing example 7 with example 3, the difference between comparative example 7 and example 3 is that only stirring and mixing are used in the preparation of the titanium dioxide modified nano graphene, so that it can be seen that the dispersibility of the nano titanium dioxide and the nano graphite oxide is improved by using ultrasonic dispersion, and the performance of the titanium dioxide modified nano graphene is improved.
Claims (7)
1. A water-based acrylic polyurethane coating for refitted vehicles is characterized in that: the coating comprises a material A, a material B and deionized water, wherein the material A comprises 65-100 parts of aqueous hydroxy acrylic acid dispersoid, 8-14 parts of titanium dioxide modified nano-graphene, 6.5-9.2 parts of butanol, 20-24 parts of talcum powder, 5-7 parts of pigment, 1.5-2.5 parts of dispersing agent, 1.8-2.8 parts of defoaming agent, 2-3.5 parts of base material wetting agent, 4-6 parts of thickening agent and 0.7-1.1 parts of film-forming additive by weight, and the weight of titanium dioxide accounts for 12-20% of the total weight of the titanium dioxide modified nano-graphene; the ingredient B is a water-based polyisocyanate curing agent; the weight ratio of the ingredient A to the ingredient B to the deionized water is (10-50) to (10) (0.4-1.8);
a preparation method of a water-based acrylic polyurethane coating for a modified car comprises the following steps:
(1) adding butanol, a dispersing agent, a defoaming agent and a base material wetting agent into the aqueous hydroxyl acrylic acid dispersoid, stirring and uniformly dispersing, then adding titanium dioxide modified nano graphene, stirring and uniformly dispersing, then adding talcum powder and pigment, stirring and uniformly dispersing to obtain a mixture;
(2) grinding the mixture until the fineness is 15-30 μm;
(3) adding a thickening agent and a film-forming aid into the ground mixture, stirring and uniformly dispersing, and filtering to obtain a material A;
(4) and adding the ingredient B and deionized water into the ingredient A, stirring and uniformly dispersing to obtain the water-based acrylic polyurethane coating.
2. The aqueous acrylic polyurethane coating for refitted vehicles according to claim 1, wherein: the ingredient A comprises 75-95 parts of aqueous hydroxyl acrylic acid dispersoid, 10-12 parts of titanium dioxide modified nano-graphene, 7.5-8.5 parts of butanol, 21-23 parts of talcum powder, 5.5-6.5 parts of pigment, 1.7-2.2 parts of dispersing agent, 2-2.5 parts of defoaming agent, 2.4-3 parts of base material wetting agent, 4.5-5.5 parts of thickening agent and 0.8-1 part of film-forming auxiliary agent, wherein the weight of titanium dioxide accounts for 14-18% of the total weight of the titanium dioxide modified nano-graphene, the ingredient B is aqueous polyisocyanate curing agent, and the weight ratio of the ingredient A, the ingredient B and deionized water is (22-33):10 (0.8-1.5).
3. The aqueous acrylic polyurethane coating for refitted vehicles according to claim 1, wherein: the defoaming agent is polyether siloxane copolymer, the film-forming assistant is ethylene glycol monobutyl ether, and the base material wetting agent is alkyl aryl polyether.
4. The aqueous acrylic polyurethane coating for refitted vehicles according to claim 1, wherein: the pigment is one or more of titanium dioxide, phthalocyanine blue, carbon black, medium chrome yellow and iron oxide red.
5. The aqueous acrylic polyurethane coating for refitted vehicles according to claim 1, wherein: the titanium dioxide modified nano graphene is prepared by the following method: preparing a nano graphite oxide into a solution, carrying out ultrasonic dispersion for 35-60min under the condition of continuous stirring, adding nano titanium dioxide, continuing to carry out ultrasonic dispersion for 20-40min, adding hydrazine hydrate and strong ammonia water, stirring and uniformly mixing, reacting for 1-3h at the temperature of 85-95 ℃, filtering, drying and grinding to obtain the titanium dioxide modified nano graphene.
6. The aqueous acrylic polyurethane coating for refitted vehicles according to claim 1, wherein: the raw materials of the ingredient A are also added with a corrosion inhibitor, and the weight of the corrosion inhibitor accounts for 3-5% of the total weight of the ingredient A.
7. The aqueous acrylic urethane coating for refitted vehicles according to claim 6, wherein: the corrosion inhibitor is zinc phosphomolybdate.
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