CN115820124A - Quick-drying process of water-based UV coating - Google Patents
Quick-drying process of water-based UV coating Download PDFInfo
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- CN115820124A CN115820124A CN202211596504.5A CN202211596504A CN115820124A CN 115820124 A CN115820124 A CN 115820124A CN 202211596504 A CN202211596504 A CN 202211596504A CN 115820124 A CN115820124 A CN 115820124A
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Abstract
The invention discloses a quick-drying process of a water-based UV coating, which comprises the steps of carrying out ultrasonic dispersion on nano metal oxide powder before the water-based UV coating is coated, then adding the nano metal oxide powder into the water-based UV coating for quick homogeneous emulsification and dispersion, so that the nano metal oxide powder and water in the water-based UV coating are reacted, the drying process that water migrates outwards in the drying and dewatering stage of the water-based UV coating in the coating process is reduced, and the time required by the drying and dewatering stage is shortened. The invention not only can effectively solve the problem of low moisture drying speed before the water-based UV coating is cured, but also has good wear resistance of a paint film after the water-based UV coating is cured into a film.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a quick-drying process of a water-based UV coating.
Background
With the continuous development and continuous promotion of industrialization and modernization, health and environmental problems caused by VOCs waste gas are attracting more and more attention, and the traditional organic wood coatings are gradually eliminated because of containing solvents with high volatile organic matter emission. Therefore, the demand of high-performance green environment-friendly coatings is rising day by day, and more coating enterprises begin to consider using environment-friendly coatings to replace traditional coatings with high content of VOCs. However, since the water-based UV coating contains water, it needs to go through a drying and water-removing stage before UV curing, and the latent heat of evaporation of water is 5-8 times that of most organic solvents for coating, and the volatilization process is very slow. In coating construction, the time required by coating film drying accounts for about 95% of the total coating process, the production rate is reduced due to drying and water removal, and the energy consumption is greatly increased, so that the moisture drying is a major technical bottleneck faced by the production efficiency of the current factory.
Disclosure of Invention
The invention aims to provide a quick-drying process of a water-based UV coating. The invention not only can effectively solve the problem of low moisture drying speed before the water-based UV coating is cured, but also has good wear resistance of a paint film after the water-based UV coating is cured into a film.
The technical scheme of the invention is as follows: a quick-drying process of a water-based UV coating comprises the steps of carrying out ultrasonic dispersion on nano metal oxide powder before the water-based UV coating is coated, then adding the nano metal oxide powder into the water-based UV coating for quick homogeneous emulsification and dispersion, enabling the nano metal oxide powder to react with moisture in the water-based UV coating, reducing the drying process of outward migration of the moisture in the drying and water removing stage of the water-based UV coating in the coating process, and shortening the time required by the drying and water removing stage.
According to the quick-drying process of the water-based UV coating, the water-based UV coating comprises the following components in parts by mass: 70-80 parts of water-based UV resin, 1-3 parts of film-forming assistant, 2-4 parts of photoinitiator, 3-6 parts of assistant and a proper amount of deionized water.
In the quick-drying process of the water-based UV coating, the auxiliary agents comprise a wetting agent, a leveling agent, a matting agent, a thickening agent and a defoaming agent.
In the quick-drying process of the water-based UV coating, the film-forming assistant is dipropylene glycol methyl ether or dipropylene glycol butyl ether;
the photoinitiator is a photoinitiator 1173, a photoinitiator 2959 or a photoinitiator TPO-L;
the wetting agent is an organic silicon gemini structure surfactant;
the leveling agent is an organic silicon geminal structure surfactant and a polyether modified polydimethylsiloxane solution;
the extinction powder is extinction powder TS100;
the thickening agent is inorganic fumed silica or a polyurethane pseudoplastic thickening agent;
the defoaming agent is polyether siloxane copolymer, modified polydimethylsiloxane or polysiloxane mixture.
According to the quick-drying process of the water-based UV coating, the water-based UV coating is prepared by adding water-based UV resin into a stirrer, uniformly stirring at the rotating speed of 500-600r/min, slowly adding a film-forming aid, a photoinitiator, a wetting agent and a leveling agent under the stirring state, and stirring and dispersing for 2-4min after adding one component; and then adjusting the rotation speed to 750-1000r/min, sequentially adding matting powder, a thickening agent and a defoaming agent, stirring and mixing for 15-30min, adjusting the rotation speed to 500-600r/min, continuing stirring and dispersing for 10-20min, and finally adding a proper amount of deionized water to adjust the viscosity of the coating to 22-30s to obtain the water-based UV coating.
In the quick-drying process of the water-based UV coating, 0.5-1.5 parts of nano metal oxide powder is added into 1-1.5 parts of volatile organic solvent for ultrasonic dispersion for 2-4min, and the ultrasonic power is 300-500W.
In the quick-drying process of the water-based UV coating, the volatile organic solvent is absolute ethyl alcohol or propyl alcohol.
In the quick-drying process of the water-based UV coating, the nano metal oxide powder is nano calcium oxide or nano magnesium oxide.
According to the quick-drying process of the water-based UV coating, the mass fraction of the nano metal oxide powder in the water-based UV coating is 0.4-1.5%.
In the process of homogenizing, emulsifying and dispersing the water-based UV coating, the ultrasonically dispersed nano metal oxide powder is added into the water-based UV coating, and the water-based UV coating is rapidly emulsified and dispersed by a homogenizer, wherein the stirring speed of the homogenizer is 1100-1300r/min, and the emulsifying time is 50-70s.
Compared with the prior art, the nano metal oxide powder is subjected to ultrasonic physical dispersion, the dispersed nano metal oxide powder is added into the water-based UV coating by adopting a homogeneous emulsification method, and the nano metal oxide powder is added in a certain proportion to react with water in the coating, so that the drying process that the water in the drying and dewatering stage of the coating in the coating process migrates outwards is reduced, the time required by the drying and dewatering stage of a paint film before ultraviolet curing is shortened, and the heat is released in the reaction process of the metal nano oxide and the water, so that the water in the water-based UV coating is accelerated to evaporate, and the dewatering time is further shortened. Meanwhile, the abrasion resistance of the coating added with the nano-scale metal oxide powder is found to be better than that of a control group coating through a paint film abrasion resistance test. Therefore, the invention can effectively solve the problems of low moisture drying speed before the water-based UV coating is cured, poor wear resistance of a paint film after the water-based UV coating is cured into a film and the like, and has important significance for improving the application proportion of the water-based coating in the wood coating and developing a green and low-carbon environment-friendly coating.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Example 1: a quick-drying process of a water-based UV coating comprises the following steps:
(1) Weighing raw material components according to a design ratio, wherein the raw material components comprise 75 parts of water-based UV resin, 3 parts of film-forming additive, 3 parts of photoinitiator, 0.8 part of wetting agent, 0.8 part of flatting agent, 2.5 parts of matting powder, 0.5 part of thickening agent, 0.4 part of defoaming agent and a proper amount of deionized water; the film-forming assistant is dipropylene glycol methyl ether, the photoinitiator is a photoinitiator 1173, the wetting machine is an organic silicon geminal structure surfactant, the matting powder is matting powder TS100, the thickening agent is inorganic fumed silica, and the defoaming agent is polyether siloxane copolymer;
(2) Adding the water-based UV resin into a stirrer, uniformly stirring at the rotating speed of 550r/min, and slowly adding the film-forming aid, the photoinitiator, the wetting agent and the flatting agent in sequence under the stirring state, wherein each addition is dispersed for 3min.
(3) Adjusting the rotating speed of the stirrer to 800r/min, sequentially adding matting powder, a thickening agent and a defoaming agent, and fully stirring and mixing for 20min;
(4) Adjusting the rotation speed of the stirrer to 550r/min, continuously stirring and dispersing for 15min, and adding a proper amount of deionized water to adjust the viscosity of the coating to 26s (coating in a No. 4 cup), so as to obtain the water-based UV coating;
(5) Adding 2.4g of nano calcium oxide powder into 3.6g of absolute ethyl alcohol solvent according to 300g of coating, and carrying out ultrasonic dispersion for 3min at the ultrasonic power of 300-500W to fully and uniformly disperse the nano calcium oxide powder to obtain a mixture solution for later use;
(6) And (3) before coating operation, adding the mixture solution obtained in the step (5) into the water-based UV paint, and quickly emulsifying and dispersing by using a homogenizer at a stirring speed of 1200r/min for 60s to obtain the water-based UV quick-drying paint.
Example 2, a process for quick drying an aqueous UV coating, comprising the steps of:
(1) Weighing raw material components according to a design ratio, wherein the raw material components comprise 75 parts of water-based UV resin, 2 parts of film-forming additive, 2 parts of photoinitiator, 0.2 part of wetting agent, 0.5 part of flatting agent, 2.0 parts of matting powder, 0.5 part of thickening agent, 0.5 part of defoaming agent and a proper amount of deionized water; the film-forming assistant is dipropylene glycol methyl ether, the photoinitiator is 2959, the wetting machine is an organosilicon gemini surfactant, the matting powder is TS100, the thickener is a polyurethane pseudoplastic thickener, and the defoaming agent is modified polydimethylsiloxane;
(2) Adding the water-based UV resin into a stirrer, uniformly stirring at a rotating speed of 580r/min, and slowly adding the film-forming aid, the photoinitiator, the wetting agent and the flatting agent in sequence under the stirring state, wherein each addition is dispersed for 2min.
(3) Adjusting the rotation speed of the stirrer to 850r/min, sequentially adding matting powder, a thickening agent and a defoaming agent, and fully stirring and mixing for 20min;
(4) Adjusting the rotation speed of the stirrer to be 500r/min, continuously stirring and dispersing for 15min, and adding a proper amount of deionized water to adjust the viscosity of the coating to be 26s (coating in a No. 4 cup) to obtain the water-based UV coating;
(5) Adding 1.2g of nano magnesium oxide powder into 3.6g of absolute ethyl alcohol solvent according to 300g of coating, and carrying out ultrasonic dispersion for 3min at the ultrasonic power of 300-500W to fully and uniformly disperse the nano calcium oxide powder to obtain a mixture solution for later use;
(6) And (3) before coating operation, adding the mixture solution obtained in the step (5) into the water-based UV paint, and quickly emulsifying and dispersing by using a homogenizer at a stirring speed of 1200r/min for 40s to obtain the water-based UV quick-drying paint.
Example 3, a process for quick drying an aqueous UV coating, comprising the steps of:
(1) Weighing raw material components according to a design ratio, wherein the raw material components comprise 80 parts of water-based UV resin, 3 parts of film-forming additive, 1.5 parts of photoinitiator, 0.8 part of wetting agent, 0.8 part of flatting agent, 2.5 parts of matting powder, 0.5 part of thickening agent, 0.5 part of defoaming agent and a proper amount of deionized water; the film-forming assistant is dipropylene glycol methyl ether, the photoinitiator is a photoinitiator TPO-L, the wetting machine is an organosilicon geminal structure surfactant, the matting powder is matting powder TS100, the thickening agent is inorganic fumed silica, and the defoaming agent is a polysiloxane mixture;
(2) Adding the water-based UV resin into a stirrer, uniformly stirring at a rotating speed of 580r/min, and slowly adding the film-forming aid, the photoinitiator, the wetting agent and the flatting agent in sequence under the stirring state, wherein each addition is dispersed for 3min.
(3) Adjusting the rotation speed of the stirrer to 850r/min, sequentially adding the matting agent, the thickening agent and the defoaming agent, and fully stirring and mixing for 20min;
(4) Adjusting the rotation speed of the stirrer to be 500r/min, continuously stirring and dispersing for 15min, and adding a proper amount of deionized water to adjust the viscosity of the coating to be 26s (coating in a No. 4 cup) to obtain the water-based UV coating;
(5) Adding 1.2g of nano calcium oxide powder into 3.6g of anhydrous propanol solvent according to 300g of coating, and carrying out ultrasonic dispersion for 3min at the ultrasonic power of 300-500W to fully and uniformly disperse the nano calcium oxide powder to obtain a mixture solution for later use;
(6) And (3) before coating operation, adding the mixture solution obtained in the step (5) into the water-based UV paint, and quickly emulsifying and dispersing by using a homogenizer at a stirring speed of 1200r/min for 50s to obtain the water-based UV quick-drying paint.
Example 4: the preparation steps of the water-based UV paint of the embodiment are the same as those of the embodiment 1, but before coating operation, 2.4g of nano calcium oxide powder and 300g of the water-based UV paint are weighed, after physical blending, a constant-temperature magnetic stirrer is adopted to magnetically stir at 18 ℃ for 10min, and then ultrasonic treatment is carried out for 15min, so that the nano calcium oxide powder is fully and uniformly dispersed in the paint, and the water-based UV quick-drying paint is obtained.
Example 5: the preparation steps of the water-based UV coating are the same as those of the embodiment 1, before coating operation, 2.4g of nano calcium oxide powder is added into 3.6g of absolute ethanol solvent according to 300g of coating, and ultrasonic dispersion is carried out for 3min at the ultrasonic power of 300-500W, so that the nano calcium oxide powder is fully and uniformly dispersed to obtain a mixture solution for later use; and then adding the mixture solution into the mixture, and magnetically stirring the mixture solution for 10min at the temperature of 18 ℃ by adopting a constant-temperature magnetic stirrer to obtain the water-based UV quick-drying coating.
Comparative example: the procedure for preparing the aqueous UV paint of this example was the same as in example 1, but without the addition of nano-metallic calcium oxide.
The test items of examples 1 to 5 and comparative example include the ratio of drying time to wet film mass, film hardness, film adhesion, abrasion resistance and impact resistance, and the results are shown in
Table 1 shows:
TABLE 1
As can be seen from Table 1, the drying time in examples 1, 2 and 3 of the present invention is greatly shortened compared with the comparative examples, which confirms that the present invention reduces the drying process of outward migration of moisture in the drying and water-removing stage of the coating material during the coating process and shortens the time required for the drying and water-removing stage of the paint film before UV curing by adding a certain proportion of nano metal oxide powder to react with the moisture in the coating material, and the heat is released during the reaction of the metal nano oxide powder with the water, so that the moisture in the aqueous UV coating material is accelerated to evaporate, thereby further shortening the water-removing time. And the invention also has about 30 percent improvement in terms of the ratio of the drying time to the wet film mass. The coatings of examples 1, 2 and 3 also had better abrasion resistance than the control coating in terms of abrasion resistance. In example 4, the nano metal calcium oxide is not added into the organic solvent for ultrasonic dispersion and subsequent emulsification dispersion, but magnetic stirring is adopted, and in example 5, emulsification dispersion is not carried out, the effects of the two groups of examples are slightly poor compared with those of example 1, which shows that the drying time of the water-based UV coating can be improved and the wear resistance of the coating can be improved by adopting the preferred process in example 1. The effects of all groups of experiments are relatively close in hardness, adhesive force and impact resistance, and the fact that the nano metal oxide powder added in the invention does not have an adverse effect on the water-based UV coating is shown.
In summary, the nano metal oxide powder is physically dispersed by ultrasound, and then the dispersed nano metal oxide powder is added into the water-based UV coating by a homogeneous emulsification method, and the nano metal oxide powder is added in a certain proportion to react with the moisture in the coating, so that on one hand, the drying process that the moisture in the drying and dehydrating stage of the coating in the coating process migrates outwards is reduced, the time required by the drying and dehydrating stage of the paint film before ultraviolet curing is shortened, and on the other hand, the heat is released in the reaction process of the metal nano oxide and the water, so that the moisture in the water-based UV coating is accelerated to evaporate, and further the dehydrating time is shortened. Meanwhile, the abrasion resistance of the coating added with the nano-scale metal oxide powder is found to be better than that of a control group coating through a paint film abrasion resistance test. Therefore, the invention can effectively solve the problems of low moisture drying speed before the water-based UV coating is cured, poor wear resistance of a paint film after the water-based UV coating is cured into a film and the like, and has important significance for improving the application proportion of the water-based coating in the wood coating and developing a green and low-carbon environment-friendly coating.
Claims (10)
1. A quick-drying process of a water-based UV coating is characterized by comprising the following steps: before the water-based UV coating is coated, the nano metal oxide powder is subjected to ultrasonic dispersion, and then the nano metal oxide powder is added into the water-based UV coating for rapid homogeneous emulsification and dispersion, so that the nano metal oxide powder and the water in the water-based UV coating are reacted, the drying process of outward migration of water in the drying and water-removing stage of the water-based UV coating in the coating process is reduced, and the time required by the drying and water-removing stage is shortened.
2. A process for quick drying of aqueous UV coatings according to claim 1, characterized by: the water-based UV coating comprises the following components in parts by mass: 70-80 parts of water-based UV resin, 1-3 parts of film-forming additive, 2-4 parts of photoinitiator, 3-6 parts of additive and a proper amount of deionized water.
3. A process for quick drying of aqueous UV coatings according to claim 2, characterized by: the auxiliary agent comprises a wetting agent, a flatting agent, matting powder, a thickening agent and a defoaming agent.
4. A process for quick drying of aqueous UV coatings according to claim 3, characterized by: the film-forming assistant is dipropylene glycol methyl ether or dipropylene glycol butyl ether;
the photoinitiator is a photoinitiator 1173, a photoinitiator 2959 or a photoinitiator TPO-L;
the wetting agent is an organic silicon gemini structure surfactant;
the leveling agent is an organic silicon gemini structure surfactant and a polyether modified polydimethylsiloxane solution;
the matting powder is matting powder TS100;
the thickening agent is inorganic fumed silica or a polyurethane pseudoplastic thickening agent;
the defoaming agent is polyether siloxane copolymer, modified polydimethylsiloxane or polysiloxane mixture.
5. A process for quick drying waterborne UV coatings according to claim 2, characterized by: the preparation of the water-based UV coating is that the water-based UV resin is added into a stirrer, the mixture is uniformly stirred at the rotating speed of 500-600r/min, and the film-forming auxiliary agent, the photoinitiator, the wetting agent and the flatting agent are slowly added in the stirring state, and the mixture is stirred and dispersed for 2-4min when one component is added; and then adjusting the rotation speed to 750-1000r/min, sequentially adding matting powder, a thickening agent and a defoaming agent, stirring and mixing for 15-30min, adjusting the rotation speed to 500-600r/min, continuing stirring and dispersing for 10-20min, and finally adding a proper amount of deionized water to adjust the viscosity of the coating to 22-30s to obtain the water-based UV coating.
6. A process for quick drying of aqueous UV coatings according to claim 1, characterized by: the ultrasonic dispersion of the nano metal oxide powder is to add 0.5 to 1.5 parts of nano metal oxide powder into 1 to 1.5 parts of volatile organic solvent, and the ultrasonic dispersion is carried out for 2 to 4min with the ultrasonic power of 300 to 500W.
7. The process for quick drying of aqueous UV coatings according to claim 6, characterized in that: the volatile organic solvent is absolute ethyl alcohol or propyl alcohol.
8. A process for quick drying waterborne UV coatings according to claim 1, characterized by: the nano metal oxide powder is nano calcium oxide or nano magnesium oxide.
9. A process for quick drying of aqueous UV coatings according to claim 1, characterized by: the mass fraction of the nano metal oxide powder in the water-based UV coating is 0.4-1.5%.
10. A process for quick drying of aqueous UV coatings according to claim 1, characterized by: the homogenizing, emulsifying and dispersing process is to add the ultrasonically dispersed nano metal oxide powder into the water-based UV coating, and rapidly emulsify and disperse by using a homogenizer, wherein the stirring speed of the homogenizer is 1100-1300r/min, and the emulsifying time is 50-70s.
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2022
- 2022-12-12 CN CN202211596504.5A patent/CN115820124A/en active Pending
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| CN1648197A (en) * | 2004-01-19 | 2005-08-03 | 蔡建设 | Self heating agent for new food and its using method |
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