CN113698862A - Water-based paint and preparation method and application thereof - Google Patents
Water-based paint and preparation method and application thereof Download PDFInfo
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- CN113698862A CN113698862A CN202111085740.6A CN202111085740A CN113698862A CN 113698862 A CN113698862 A CN 113698862A CN 202111085740 A CN202111085740 A CN 202111085740A CN 113698862 A CN113698862 A CN 113698862A
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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Abstract
The invention discloses a water-based paint, a preparation method and an application thereof, wherein the water-based paint is prepared from the following preparation raw materials: the ultraviolet curing polyurethane resin comprises water-based ultraviolet curing polyurethane resin, a substrate wetting agent, a photoinitiator and water. Compared with the prior art in which no rheological additive and defoaming agent are added, the water-based paint has the advantages that the raw materials used by the water-based paint are simple and few in variety, the influence of the rheological additive and defoaming agent on the activation period of paint construction and the appearance effect of a stored coating is reduced, and the stability of a coating is improved. The coating can keep the original appearance effects of leveling, fullness and the like after being stored for more than 1 year, and the quality guarantee period of the water-based coating and the stability of the coating in the quality guarantee period are greatly prolonged.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a water-based coating as well as a preparation method and application thereof.
Background
The UV coating is characterized in that under the irradiation of ultraviolet light, a photoinitiator in the coating absorbs the radiation energy of the ultraviolet light and then is split into free radicals, electrons on the outer layer of the molecules jump to form active centers in a very short time, then the active centers react with unsaturated groups in the resin to initiate the disconnection of double bonds in the molecules of the photocuring resin and the active diluent, and a prepolymer is initiated to carry out polymerization, crosslinking and grafting reactions and is cured into a reticular high polymer in a very short time. Thereby leading the UV coating to be converted from a liquid state into a solid state within seconds to form a film-forming substance; the curing speed is high, the cured coating has high hardness and good wear resistance, the best performance can be achieved without subsequent baking, and the energy consumption is low and the coating is widely applied.
The high-gloss UV coating is one of UV coatings which are applied more frequently, and the high-gloss UV coating is widely applied to 3C electronic products, automobile interior parts and the like due to the characteristics of high gloss, good fullness, good transparency and the like; the solvent type high-gloss UV coating contains a certain amount of organic solvent, and is diluted by the organic solvent in the actual application process, so that the VOC is more than or equal to 650g/L, in order to reduce the VOC content in the related technology, a large amount of monomers are often used to replace the organic solvent to reduce the viscosity, the addition of the monomers can reduce the hardness, the chemical resistance and the like of a coating film, the surface performance of the coating film is not facilitated, and the toxicity ratio of the monomers is relatively high. In the related art, the water-based high-gloss UV coating is developed to reduce the VOC value, but the defects of complex components, poor appearance effect after being stored for a period of time, short shelf life and the like exist, and the development and market acceptance of the water-based high-gloss UV are limited to a certain extent.
Therefore, there is a need to develop a water-based paint which has simple components and good storage effect.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the water-based paint which is simple in components and good in storage effect.
The invention also provides a preparation method of the water-based paint.
The invention also provides application of the water-based paint.
The invention provides a water-based paint which is prepared from the following preparation raw materials: the ultraviolet curing polyurethane resin comprises water-based ultraviolet curing polyurethane resin, a base material wetting agent, a photoinitiator and water;
the substrate wetting agent is a polyether modified polysiloxane surfactant.
The substrate wetting agent disclosed by the invention has excellent substrate wetting performance and leveling performance, has excellent compatibility and stability with the aqueous ultraviolet-curing polyurethane resin, and can not cause the problems of precipitation or poor compatibility in the long-time storage process, so that the paint can still keep excellent mirror surface leveling effect and fullness effect after long-time storage.
According to some embodiments of the present invention, the water-based paint is prepared from the following preparation raw materials in parts by weight: 85-95 parts of water-based ultraviolet curing polyurethane resin; 0.2-0.5 parts of a base material wetting agent; 2 to 4 parts of photoinitiator and 1 to 10 parts of water.
According to some embodiments of the present invention, the aqueous UV-curable polyurethane resin has a viscosity of 10s to 20s (measured at 25 ℃ C. using a Zahn-3# cup).
According to some embodiments of the present invention, the functionality of the aqueous UV-curable polyurethane resin is 4 to 8.
According to some embodiments of the present invention, the aqueous UV-curable polyurethane resin has a functionality of 4 to 6.
According to some embodiments of the invention, the aqueous uv curable polyurethane resin has a functionality of 6.
According to some embodiments of the present invention, the pH of the aqueous UV-curable polyurethane resin is 7 or less.
According to some embodiments of the present invention, the pH of the aqueous UV-curable polyurethane resin is 3 to 7.
According to some embodiments of the present invention, the solid content of the aqueous uv-curable polyurethane resin is 50% or more.
The functionality of the water-based ultraviolet curing polyurethane resin is 4-8, so that the good crosslinking density is maintained, and meanwhile, the adhesive force, hardness, wear resistance and chemical resistance are also brought.
The pH value of the water-based ultraviolet-curing polyurethane resin is below 7, so that the water-based ultraviolet-curing polyurethane resin is favorable for stable storage under the weak acidic condition, and the pH value does not need to be adjusted in the construction process.
The solid content of the water-based ultraviolet curing polyurethane resin is more than 50 percent, the film thickness can reach the set film thickness by spraying for a few times during construction, and the VOC is reduced because the solid content is higher.
According to some embodiments of the invention, the waterborne uv curable polyurethane resin includes at least one of the following three new IRR1104, the three new IRR1080, the five WU3604, the five WU3601-1, and the five WU 3601.
The viscosity of the water-based ultraviolet curing polyurethane resin selected by the invention is low or can be greatly reduced by adding water within 5 percent, the solid content can be more than or equal to 45 percent during construction, and the spraying application is convenient; the water-based paint prepared from the water-based ultraviolet curing polyurethane resin has excellent mirror surface leveling effect and fullness after being subjected to ultraviolet curing film forming, the gloss is more than or equal to 90 degrees, and the highlight effect is excellent.
The waterborne ultraviolet curing polyurethane resin has higher crosslinking density, excellent physical and chemical properties (mirror surface leveling and visual fullness effects, hardness, gloss and chemical resistance), and excellent adhesive force to plastic substrates, wood and other materials; meanwhile, the resin has better thixotropy, does not need to additionally add a rheological additive, also has better constructability, and reduces the abnormal phenomenon of poor leveling after storage caused by the introduction of the rheological additive (in the related technology, the rheological additive and the waterborne ultraviolet curing polyurethane resin can form a three-dimensional network structure after being mixed, and the three-dimensional network structure can cause the thixotropic leveling recovery index of the coating to be gradually and slowly reduced along with the continuous increase of storage time, so that the mirror surface leveling effect of the coating is influenced, and the leveling of the coating after storage is reduced).
The waterborne ultraviolet curing polyurethane resin disclosed by the invention generates less foam during stirring, the use is not influenced, and meanwhile, during construction, a sprayed wet film can be quickly defoamed, and appearance abnormity such as bubbles or particles and the like cannot be generated on a dry film coating.
According to some embodiments of the invention, the substrate wetting agent is a polyether modified polysiloxane surfactant.
According to some embodiments of the present invention, the polyether-modified polysiloxane surfactant has a static surface tension lowering rating of class 3 (see ISO 4311-1979 International Standard test, national Standard GB/T11278-1989).
According to some embodiments of the invention, the substrate wetting agent is at least one of TegoWet270 of winning chemistry, Twin4100 of winning chemistry, ST-1070 of Mulberry well chemistry, and ST-1075 of Mulberry well chemistry.
The effective component of the base material wetting agent is 100%, the base material wetting and leveling performance is excellent, the wetting agent disclosed by the invention cannot cause orange peel caused by poor long-wave leveling on the surface of a coating, and the wetting agent disclosed by the invention has excellent compatibility and stability with the waterborne ultraviolet curing polyurethane resin, and cannot be separated out after storage or cause the weakening of the wetting effect on the base material due to poor compatibility, so that the mirror flow leveling and fullness effects can be maintained for a long time after storage.
According to some embodiments of the invention, the initiator consists of initiator i and initiator ii.
According to some embodiments of the invention, the initiator I is 2-hydroxy-2-methyl-phenyl-propanone (CAS number 7473-98-5).
According to some embodiments of the invention, the initiator II is selected from at least one of 1-hydroxy-cyclohexylbenzophenone (CAS number: 947-19-3), 2,4, 6-trimethylbenzoyl-ethoxy-phenylphosphine oxide (CAS number: 75980-60-8) and phenylbis (2,4, 6-trimethylbenzoyl) phosphine oxide (CAS number: 162881-26-7).
The 2-hydroxy-2-methyl-phenyl acetone initiator is in a bulk form, has high activity, participates in photocuring reaction, can be used as a carrier and has good solubility for the initiator II, does not need to use a cosolvent additionally to dissolve the initiator II, and reduces the integral VOC of the coating; the initiator II has the capability of absorbing different wavelengths of ultraviolet regions, and the resin is quickly cured to form a solid coating in the ultraviolet curing process of the wet film coating.
The initiator selected by the invention can not cause yellowing, and the coating is cured more comprehensively and thoroughly, so that the water resistance of the coating is improved.
According to some embodiments of the present invention, the mass ratio of the initiator I to the initiator II is 1:1 to 4.
The mass ratio of the initiator I to the initiator II is less than 1:1, because the initiator II is solid, if the content of the initiator I is less than 50%, the dissolving effect on the initiator II is insufficient, so that the initiator II cannot be completely dissolved, and a cosolvent is required to be additionally added to introduce VOC, so that the VOC content of the coating is increased. If the ratio is higher than 4:1, the content of the initiator II is less, and the deep curing of the coating and the insufficient absorption of the wavelength of a high wave band during the curing of the coating result in incomplete curing of the bottom of the coating, thereby affecting the water resistance.
The second aspect of the present invention provides a method for preparing the above water-based paint, comprising the following steps:
and sequentially adding the substrate wetting agent, the photoinitiator and the water into the aqueous ultraviolet curing polyurethane resin, and uniformly mixing.
According to some embodiments of the invention, the photoinitiator is heated prior to addition.
According to some embodiments of the invention, the heating is at a temperature of 60 ℃ to 80 ℃.
According to some embodiments of the invention, the method of preparing the aqueous coating comprises the steps of:
s1, dispersing the waterborne ultraviolet curing polyurethane resin for 3-5 min under the stirring of 300-500 rpm;
s2, adding the base material wetting agent into the aqueous ultraviolet curing polyurethane resin treated in the step S1 at a stirring speed of 600 rpm-800 rpm, dispersing for 2 min-3 min, and uniformly stirring to obtain an aqueous ultraviolet curing polyurethane resin dispersion liquid;
s3, adding a photoinitiator II into the photoinitiator I, heating and dissolving at the temperature of 60-80 ℃ until the initiator is completely dissolved into a liquid state, stirring and dispersing at 400-500 rpm for 5-10 min, uniformly stirring, cooling, adding into the aqueous ultraviolet curing polyurethane resin dispersion liquid in S2, dispersing for 8-10 min, and uniformly stirring;
s4, slowly adding water into the mixture prepared in the step S3 at the stirring speed of 400-600 rpm, dispersing for 8-10 min, and uniformly stirring; thus obtaining the water-based paint.
In a third aspect, the invention provides a water-based coating prepared from the water-based paint.
The fourth aspect of the present invention provides a method for preparing the above aqueous coating, comprising the steps of: and coating the water-based paint on the surface of a substrate, heating and photocuring to obtain the coating.
According to some embodiments of the invention, the substrate comprises one of a plastic substrate, wood, metal, and paper.
According to some embodiments of the invention, the method for preparing the aqueous coating comprises the steps of:
stirring and mixing the water-based paint and water according to the mass ratio of 100: 0-10, spraying the mixture on the surface of a base material, baking the mixture for 8-12 min at the temperature of 60-70 ℃, and then performing energy treatment at the energy of 800mj/cm2～1200mj/cm2Light intensity of 90mw/cm2～125mw/cm2And (3) carrying out UV (ultraviolet) curing under the condition to obtain the water-based coating.
The fifth aspect of the invention provides a high-gloss UV coating prepared from the water-based paint.
According to at least one embodiment of the present invention, the following advantageous effects are provided:
1. the content of the organic solvent in the water-based paint is less than or equal to 5 percent, the VOC content is less than or equal to 100g/L during construction, and the water-based paint is environment-friendly; the viscosity of the coating is not high, and the coating can be diluted to a proper spraying viscosity range by adding water within 5 percent without reducing the performance of a coating film.
2. Compared with the prior art in which no rheological additive and defoaming agent are added, the water-based paint disclosed by the invention has the advantages that the raw materials used by the water-based paint are simple and few in variety, the influence of the rheological additive and defoaming agent on the activation period of the paint during construction and the appearance effect of a coating after storage is reduced, and the stability of a coating is improved.
3. The water-based paint disclosed by the invention can keep the original appearance effects of leveling, fullness and the like after being stored for more than 1 year, and the quality guarantee period of the water-based paint and the stability of the paint in the quality guarantee period are greatly prolonged.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Specific examples of the present invention are described in detail below.
The properties of some of the prepared raw materials in the embodiment of the invention are as follows:
the main performance data for the highly updated IRR1104 are as follows:
a functionality of 6; the solid content is 55-60%; the pH is 3 to 5.
The major performance data for the highly updated IRR1080 are as follows:
a functionality of 6; the solid content is 60 to 65 percent; the pH is 3 to 5.
The main performance data of WU3604 in the five-element chemical industry are as follows:
a functionality of 6; the solid content is 50% -54%; the pH value is 6-7.
The main performance data of WU3601-1 in the five-element chemical industry are as follows:
a functionality of 6; the solid content is 58-62%; the pH value is 5-6.
The main performance data of WU3601 in the five-element chemical industry are as follows:
a functionality of 6; the solid content is 58-62%; the pH value is 5-6.
The static surface tension reduction levels of TegoWet270 of winning chemistry, Twin4100 of winning chemistry, ST-1070 of mulberry chemical engineering and ST-1075 of mulberry chemical engineering are 3 grades (refer to ISO 4311-.
The BYK-346 has a static surface tension reduction grade of 1 (refer to the international standard test of ISO 4311-.
The specific rating information is as follows:
0 grade, the degree of reducing the static surface tension is less than 10 percent;
level 1, reducing the static surface tension by 10-20%;
level 2, reducing the static surface tension by 20-30%;
grade 3, the degree of static surface tension reduction is more than 30%.
Example 1
The water-based paint of this example was prepared from the preparation raw materials shown in table 1:
TABLE 1 preparation of the Water-based paint of this example
Example 2
The water-based paint of this example was prepared from the preparation raw materials shown in table 2:
TABLE 2 preparation of the Water-based paint of this example
| Preparation of the starting Material | Manufacturer of the product | Number of parts |
| Aqueous ultraviolet-curing polyurethane resin | Five-element chemical WU3604 | 95.00 |
| Substrate wetting agent | Winning and creating chemistry TegoWet270 | 0.4 |
| Photoinitiator I | 2-hydroxy-2-methyl-phenylacetone-1 | 1.5 |
| Photoinitiator II | 1-hydroxy-cyclohexylbenzophenone | 1 |
| Water (W) | - | 2.1 |
| Total up to | - | 100 |
Comparative example 1
This comparative example is a water-based paint prepared from the preparation raw materials shown in table 3:
TABLE 3 preparation of aqueous coating of this comparative example
Comparative example 2
This comparative example is a water-based paint prepared from the preparation raw materials shown in table 4:
TABLE 4 preparation of aqueous coating of this comparative example
Comparative example 3
This comparative example is a water-based paint prepared from the preparation raw materials shown in table 5:
TABLE 5 preparation of aqueous coating of this comparative example
| Preparation of the starting Material | Manufacturer of the product | Number of parts |
| Aqueous ultraviolet-curing polyurethane resin | Five-element chemical WU3604 | 95.00 |
| Substrate wetting agent | Winning and creating chemistry Tego Wet270 | 0.4 |
| Photoinitiator I | 2-hydroxy-2-methyl-phenylacetone-1 | 1.5 |
| Photoinitiator II | 1-hydroxy-cyclohexylbenzophenone | 1 |
| Rheology aid | D modest chemical rheeolate 299 | 0.5 |
| Water (W) | - | 1.6 |
| Total up to | - | 100 |
Comparative example 4
This comparative example is a water-based paint prepared from the preparation raw materials shown in table 6:
TABLE 6 preparation of aqueous coating of this comparative example
The preparation method of the water-based paint of the embodiment 1-2 and the comparative example 1-4 comprises the following steps:
the preparation method of the aqueous coating in the embodiment of the invention comprises the following steps:
s1, dispersing the waterborne ultraviolet curing polyurethane resin for 4min under the stirring of the speed of 400 rpm;
s2, adding the base material wetting agent into the aqueous ultraviolet curing polyurethane resin treated in the step S1 at the stirring speed of 700rpm, dispersing for 3min, and uniformly stirring to obtain an aqueous ultraviolet curing polyurethane resin dispersion liquid;
s3, adding the photoinitiator II into the photoinitiator I, heating and dissolving at 70 ℃ until the initiator is completely dissolved into a liquid state, stirring and dispersing at 400rpm for 10min, uniformly stirring, cooling, adding into the aqueous ultraviolet-curing polyurethane resin dispersion liquid in S2, dispersing for 10min, and uniformly stirring;
s4, slowly adding water into the mixture prepared in the step S3 at the stirring speed of 500rpm, dispersing for 10min, and uniformly stirring; thus obtaining the water-based paint.
The preparation method of the aqueous coating in the embodiment of the invention comprises the following steps:
stirring and mixing the water-based paint and water according to the mass ratio of 100:5, spraying the mixture on the surface of a plastic substrate, baking the mixture for 8min at 70 ℃, and then, performing energy treatment on the mixture at 1000mj/cm2Light intensity of 100mw/cm2And (3) carrying out UV (ultraviolet) curing under the condition to obtain the water-based coating.
The performance test results of the water-based coatings of examples 1-2 and comparative examples 1-4 of the present invention are shown in tables 7-9.
VOC test methods: the water withholding method specified in GB 30981-2020;
viscosity: zahn-3# cup, 25 ℃;
viscosity during construction: zahn-3# cup, 25 ℃;
appearance: observing with naked eyes;
leveling: observing with naked eyes;
gloss: gloss meter, 60 ° angle measurement;
hardness: pencil hardness (500g force);
sun cream resistance: nivea SPF30+ + is smeared, and the appearance of the coating is observed after the coating is placed for 24 hours under the conditions of 65 ℃/90% RH;
windex resistant cleaner: after the Windex cleaning agent is smeared, the coating appearance is observed after the cleaning agent is placed for 24 hours under the condition of 65 ℃/90% RH.
TABLE 7 Performance test results of the aqueous coating materials of inventive examples 1 to 2 and comparative examples 1 to 4
TABLE 8 Performance test results of the aqueous coating materials of inventive examples 1 to 2 and comparative examples 1 to 4
TABLE 9 Performance test results of the aqueous coating materials of inventive examples 1 to 2 and comparative examples 1 to 4
The values of the test data from tables 7-9: compared with the comparative example 1, the resin content of the comparative example 1 is lower than that of the comparative example 1, so that the water content is increased, the viscosity is low during construction, and the production and the application are not facilitated; the cured coating has a few particle pinholes, no activation period and poorer effect after storage.
Example 1 compared to comparative example 2, the substrate wetting agent was changed to BYK-346, birk chemical, which, while it was a silicone leveling aid, was not compatible with the resin system of the present invention, resulting in a coating cured at 24 hours pot life with few particle pinholes; after storage at 40 ℃ for 30 days, the coating had a slight orange peel appearance, and the leveling was slightly poor.
Compared with the comparative example 3, in the comparative example 3, the rheological additive, namely the chemical rheeolate 299 is additionally added, the gloss of the cured coating is less than 90 degrees and only 88 degrees, the high-gloss and high-gloss effect of the coating is influenced, the surface of the cured coating has a slight orange peel phenomenon in the activation period of 24 hours, and the leveling is slightly poor; after storage at 40 ℃ for 30 days, the coating had a slight orange peel appearance, and the leveling was slightly poor.
Compared with the comparative example 4, the BYK-024 of a defoamer Bike chemical is additionally added in the comparative example 3, so that the viscosity is low during construction, and the application is not facilitated; the surface of the coating cured in 24 hours of activation period has slight orange peel phenomenon, and the leveling is slightly poor; after storage at 40 ℃ for 30 days, the coating had a slight orange peel appearance, and the leveling was slightly poor.
The present invention does not use thixotropic aids and defoamers which may affect the clarity, leveling, or storage stability of the coating film. The thixotropic auxiliary agent can cause the thixotropic leveling recovery index of the coating to gradually and slowly reduce, the leveling effect of the coating after long-term storage and the stability of the coating in the shelf life are influenced, and the defoaming agent has an incompatible effect with a system and influences the mirror effect and the leveling of a flow coating of the coating after long-term storage.
The wet film sprayed by the paint has good anti-sagging effect and can be quickly defoamed, so that the wet film can achieve good anti-sagging and defoaming effects without adding a rheological additive and a defoaming agent
The water-based paint disclosed by the invention has the advantages that the raw materials for manufacturing the water-based paint are few, the process is simple, the appearance effect and the performance are kept, the negative benefits caused by long-term storage due to excessive raw materials are avoided to a great extent, the storage quality guarantee period is greatly prolonged, the appearance and the performance are kept unchanged after the water-based paint is stored for more than one year, the activation period during construction is prolonged, and the paint waste is avoided.
The VOC content of the water-based paint is less than or equal to 100g/L, so that the pollution to the environment is greatly reduced, the environment-friendly treatment cost is reduced for users, and the resources are saved. Compared with the spray coating and the solvent coating in the related technology, the VOC content is extremely low (the VOC is generally more than or equal to 550 g/L; even if the VOC is low, the VOC is generally between 450g/L and 550 g/L).
In conclusion, the content of the organic solvent in the water-based paint is less than or equal to 5 percent, the VOC content is less than or equal to 100g/L during construction, and the water-based paint is environment-friendly; the viscosity of the coating is not high, and the coating can be diluted to a proper spraying viscosity range by adding water within 5 percent without reducing the performance of a coating film. Compared with the prior art in which no rheological additive and defoaming agent are added, the water-based paint has the advantages that the raw materials used by the water-based paint are simple and few in variety, the influence of the rheological additive and defoaming agent on the activation period of paint construction and the appearance effect of a stored coating is reduced, and the stability of a coating is improved. The coating can keep the original appearance effects of leveling, fullness and the like after being stored for more than 1 year, and the quality guarantee period of the water-based coating and the stability of the coating in the quality guarantee period are greatly prolonged.
While the embodiments of the present invention have been described in detail with reference to the specific embodiments, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. An aqueous coating characterized by: the preparation method is characterized by comprising the following steps of: the ultraviolet curing polyurethane resin comprises water-based ultraviolet curing polyurethane resin, a base material wetting agent, a photoinitiator and water;
the substrate wetting agent is a polyether modified polysiloxane surfactant.
2. The aqueous coating of claim 1, wherein: the preparation is prepared from the following preparation raw materials in parts by weight: 85-95 parts of water-based ultraviolet curing polyurethane resin; 0.2-0.5 parts of a base material wetting agent; 2 to 4 parts of photoinitiator and 1 to 10 parts of water.
3. The aqueous coating of claim 1, wherein: the viscosity of the water-based ultraviolet curing polyurethane resin is 10 s-20 s (Zahn-3# cup, 25 ℃); preferably, the functionality of the aqueous ultraviolet curing polyurethane resin is 4-8; preferably, the pH value of the aqueous ultraviolet light curing polyurethane resin is less than or equal to 7; preferably, the solid content of the aqueous ultraviolet light curing polyurethane resin is more than 50%.
4. The aqueous coating of claim 1, wherein: the substrate wetting agent reduced static surface tension on a scale of 3.
5. The aqueous coating of claim 1, wherein: the photoinitiator consists of an initiator I and an initiator II; preferably, the mass ratio of the initiator I to the initiator II is 1: 1-4; preferably, the initiator I is 2-hydroxy-2-methyl-phenyl acetone-1; preferably, the initiator II is selected from at least one of 1-hydroxy-cyclohexylbenzophenone, 2,4, 6-trimethylbenzoyl-ethoxy-phenylphosphine oxide and bis (2,4, 6-trimethylbenzoyl) phenylphosphine oxide.
6. A process for preparing the aqueous coating material according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
and sequentially adding the substrate wetting agent, the photoinitiator and the water into the aqueous ultraviolet curing polyurethane resin and uniformly mixing.
7. The method of claim 6, wherein: the photoinitiator needs to be heated before being added; preferably, the heating temperature is 60 ℃ to 80 ℃.
8. An aqueous coating characterized by: prepared from the aqueous coating material of any one of claims 1 to 5.
9. A method of making the aqueous coating of claim 8, wherein: the method comprises the following steps: and coating the water-based paint on the surface of a substrate, heating and photocuring to obtain the coating.
10. A high gloss UV coating characterized by: prepared from the aqueous coating material of any one of claims 1 to 5.
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| CN113698862B (en) | 2022-06-24 |
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