Two-component negative oxygen ion water-based paint decorative plate and preparation method thereof

Abstract

The invention discloses a two-component negative oxygen ion water-based paint decorative sheet and a preparation method thereof, the two-component negative oxygen ion water-based paint decorative sheet comprises a base material and a functional coating coated on the surface of the base material, and the functional coating is formed by mixing and curing a component A and a component B; the component A is prepared from the following substances in parts by weight: 50 to 70 parts of water-based paint, 10 to 20 parts of cerium-doped modified tourmaline powder and 5 to 15 parts of microcapsules; negative oxygen ions are released through the piezoelectric effect and the pyroelectric effect in the pure physical process, cerium-doped modified tourmaline powder is added into the bi-component polyurethane emulsion water-based paint, after full stirring, the water-based paint is prepared, and the water-based paint is prepared. The nano-scale tourmaline is uniformly coated on a decorative artificial board with primer, and after curing, the nano-scale tourmaline effectively contacts with air, can stably release negative oxygen ions, and does not generate negative effects on human bodies.

Description

Technical Field

[0001] The invention relates to the technical field of water-based paint decorative boards, in particular to a two-component negative oxygen ion water-based paint decorative board and a preparation method thereof. Background Art

[0002] Oxygen ions with negative charges are called "negative oxygen ions". Negative oxygen ions enjoy the reputation of "air cellulose". They can not only purify the air, but also improve lung function, promote blood circulation, promote metabolism, and relieve respiratory diseases. Indoor ventilation causes people to experience dizziness, hypoxia and other symptoms, which is harmful to human health. With the strengthening of the sealing of modern buildings, the naturally existing negative oxygen ions in the room cannot meet the needs of human breathing. The traditional negative oxygen ion solution uses radioactive substances such as thorium as a medium to ionize the air and release negative oxygen ions. This solution is added to water-based paint and is harmful to the human body. To this end, we propose a two-component negative oxygen ion water-based paint decorative board and a preparation method thereof. Summary of the invention

[0003] The purpose of the present invention is to provide a two-component negative oxygen ion water-based paint decorative board and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a two-component negative oxygen ion water-based paint decorative plate, comprising a substrate and a functional coating coated on the surface of the substrate, wherein the functional coating is formed by mixing and curing component A and component B; Wherein, the component A comprises the following substances in parts by weight: 50-70 parts by weight of water-based paint, 10-20 parts by weight of cerium-doped modified tourmaline powder and 5-15 parts by weight of microcapsules; Wherein, the B component includes the following substances in parts by weight: 40-60 parts by weight of a waterborne epoxy curing agent and 10-25 parts by weight of a photocatalytic material.

[0005] Preferably, the doping amount of the cerium element in the cerium-doped modified tourmaline powder is 1% to 5% of the mass of the tourmaline, and the surface of the cerium-doped modified tourmaline powder is modified by a silane coupling agent KH-550.

[0006] Preferably, the photocatalytic material is / Heterojunction photocatalytic materials, and / Heterojunction photocatalytic materials and The molar ratio is (1:1)~(1:2).

[0007] Preferably, the / The method for preparing the heterojunction photocatalytic material comprises the following steps: a. Dispersed in deionized water and sonicated for 30 min; b. Then add The solution was stirred for 30 minutes. The molar ratio of Ag:Ti in the solution is 1:1~2:1; c. Then add dropwise Solution, adjust pH to 5-6, and react for 2 hours in the dark; d. Finally, the precipitate was collected by centrifugation, washed with deionized water and ethanol alternately for 3 times, and dried under vacuum at 60°C for 12 hours to obtain / Heterojunction photocatalytic materials.

[0008] Preferably, the particle size of the microcapsule is 1-10 μm, the shell layer of the microcapsule is made of chitosan or polydopamine, and the shell thickness is 100-500 nm, and the mass ratio of nano-calcium carbonate to silane coupling agent in the core material of the microcapsule is (2:1)-(5:1).

[0009] Preferably, the water-based paint is a two-component polyurethane water-based paint.

[0010] Preferably, the substrate is a bamboo fiberboard, a calcium silicate board or a decorative artificial board with a thickness of 3 to 20 mm.

[0011] The preparation method of the two-component negative oxygen ion water-based paint decorative board comprises the following steps: S1. Substrate pretreatment: The substrate surface is treated with atmospheric pressure cold plasma, the treatment gas is a mixture of argon and oxygen (volume ratio 9:1), the treatment power is 100~300 W, and the treatment time is 1~5 minutes; S2, preparation of component A: disperse the cerium-doped modified tourmaline powder and the two-component polyurethane water-based paint through a high shear emulsifier (speed 8000-12000 rpm, time 30-60 minutes), then add microcapsules and mix ultrasonically for 10-20 minutes; S3. Preparation of component B: / The heterojunction photocatalytic material was mixed with water, and then a water-based epoxy curing agent was added and ball milled for 2 to 4 hours (ball to material ratio 5:1, rotation speed 200 to 400 rpm); S4, coating: Component A and component B are mixed online in a static mixer in proportion, and coated on the surface of the pretreated substrate by an electrostatic spraying device, with a spraying thickness of 50-200 μm; S5, curing: first use UV-LED light source (wavelength 395 nm, power density 50~100 ) for 10 to 30 seconds for pre-curing, and then cured at 60 to 80°C in a far-infrared radiation heating device for 2 to 4 hours to form a two-component negative oxygen ion water-based paint decorative board.

[0012] Preferably, the voltage of the electrostatic spraying in step S4 is 40-80 kV, the distance between the spray gun and the substrate is 20-40 cm, and the spraying pressure is 0.3-0.6 MPa.

[0013] Preferably, the surface roughness Ra of the substrate after the cold plasma treatment in step S1 is 0.5-2 , and the surface oxygen content increases by 20%~40%.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention releases negative oxygen ions through the pure physical process of piezoelectric effect and pyroelectric effect. Tourmaline powder is added to a two-component polyurethane emulsion water-based paint, and after sufficient stirring, it is evenly coated on the decorative artificial board with a primer. After curing, the nano-level tourmaline effectively contacts the air, can stably release negative oxygen ions, and will not have a negative impact on the human body.

[0015] The present invention adds microcapsules. Since the shell of the microcapsules is chitosan or polydopamine, and the core material is nano calcium carbonate and silane coupling agent, when the paint film is damaged by acidic pollutants (such as ) When the decorative board is corroded and damaged, the microcapsules rupture to release calcium carbonate to neutralize the acidic substances, while the silane coupling agent repairs the scratches, which can significantly extend the service life of the decorative board.

[0016] The present invention uses cerium doping to modify the tourmaline powder and / The synergistic effect of heterojunction photocatalytic materials releases negative oxygen ions up to (28-day average), compared with traditional tourmaline coatings (≤2000 ) is increased by more than 150%, and has excellent long-term stability. The photocatalytic material can decompose pollutants such as formaldehyde and TVOC under visible light, with a formaldehyde degradation rate of ≥90% (24 hours), achieving the dual functions of negative ion release and air purification.

[0017] The present invention adopts atmospheric pressure cold plasma ( The mixed gas) activates the surface of the decorative board substrate to form a nano-scale rough structure, which can effectively improve the adhesion of the functional coating and thus avoid the coating from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of the preparation method of two-component negative oxygen ion water-based paint decorative panels. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all methods known to those skilled in the art.

[0021] Unless otherwise specified, the aqueous epoxy curing agent used in the embodiments of the present invention is Dow DER-331.

[0022] For example, see Figure 1 The present invention provides a technical solution: a two-component negative oxygen ion water-based paint decorative board, comprising a substrate and a functional coating coated on the surface of the substrate, wherein the functional coating is formed by mixing and curing component A and component B, component A comprises the following substances in parts by weight: 50 parts by weight of water-based paint, 10 parts by weight of cerium-doped modified tourmaline powder and 15 parts by weight of microcapsules, and component B comprises the following substances in parts by weight: 60 parts by weight of water-based epoxy curing agent and 10 parts by weight of photocatalytic material.

[0023] The cerium-doped modified tourmaline powder in the present application is homemade, and its preparation steps are specifically as follows: first, 10 g of tourmaline powder and 0.3 g of cerium nitrate are dissolved in an ethanol / water mixed solvent (volume ratio of 1:1), and stirred at 80°C for 4 hours; then, Ce@Tourmaline is formed by a sol-gel method, and calcined at 600°C for 2 hours to obtain cerium-doped modified tourmaline powder, and the doping amount of cerium element in the cerium-doped modified tourmaline powder is 4% of the mass of tourmaline, and the surface of the cerium-doped modified tourmaline powder is modified by a silane coupling agent KH-550.

[0024] The photocatalytic material in this application is / The heterojunction photocatalytic material has the following preparation steps: Dispersed in deionized water, ultrasonicated for 30 minutes; then added The solution (Ag:Ti molar ratio 1:1) was stirred for 30 minutes; then the The solution was adjusted to pH 6 and reacted for 2 hours in the dark. Finally, the precipitate was collected by centrifugation, washed alternately with deionized water and ethanol for 3 times, and dried under vacuum at 60°C for 12 hours to obtain / Heterojunction photocatalytic materials, / Heterojunction photocatalytic materials and The molar ratio is 1:2.

[0025] Specifically, the particle size of the microcapsule is 10 μm, the shell layer of the microcapsule is made of chitosan or polydopamine, and the shell layer thickness is 300 nm, and the mass ratio of nano-calcium carbonate to silane coupling agent in the core material of the microcapsule is 2:1.

[0026] Specifically, the water-based paint is a two-component polyurethane water-based paint.

[0027] Specifically, the base material is bamboo fiberboard, calcium silicate board or decorative artificial board with a thickness of 20 mm.

[0028] The preparation method of the two-component negative oxygen ion water-based paint decorative board of this embodiment comprises the following steps: S1. Substrate pretreatment: The surface of the bamboo fiberboard is treated with atmospheric pressure cold plasma, the treatment gas is a mixture of argon and oxygen (volume ratio 9:1), the treatment power is 100~300 W, and the treatment time is 1~5 minutes; S2, preparation of component A: the cerium-doped modified tourmaline powder and the two-component polyurethane water-based paint were dispersed by a high-shear emulsifier (speed 12000 rpm, time 60 minutes), and then the microcapsules were added and ultrasonically mixed for 10-20 minutes; S3. Preparation of component B: / The heterojunction photocatalytic material was mixed with water, and then a water-based epoxy curing agent was added and ball milled for 2 to 4 hours (ball-to-material ratio 5:1, rotation speed 400 rpm); S4, coating: Component A and component B are mixed online in a static mixer in proportion, and coated on the surface of the pretreated substrate by an electrostatic spraying device, with a spraying thickness of 200 μm; S5, curing: first use UV-LED light source (wavelength 395 nm, power density ) for 10 to 30 seconds for pre-curing, and then cured at 80°C for 4 hours in a far-infrared radiation heating device to form a two-component negative oxygen ion water-based paint decorative board.

[0029] Specifically, in step S4, the voltage of the electrostatic spraying is 80 kV, the distance between the spray gun and the substrate is 40 cm, and the spraying gas pressure is 0.6 MPa.

[0030] Specifically, the surface roughness Ra of the substrate after the cold plasma treatment in step S1 is 2 μm, and the surface oxygen content increases by 40%.

[0031] It should be explained that the mechanism of action of cerium-doped modified tourmaline powder in the present application is that cerium, as a rare earth element, has flexible valence state conversion ability. By doping it into the tourmaline lattice through the sol-gel method, oxygen vacancies and doping energy levels can be formed, the band gap width of tourmaline can be reduced, and its surface electric field effect can be enhanced. Tourmaline itself has spontaneous polarization characteristics, and there is an electrostatic field (about ), which can ionize water molecules in the air. After cerium doping, the electric field strength is enhanced, the ionization efficiency is significantly increased, and more and Combined with the generation of negative oxygen ions, traditional tourmaline is easily oxidized and deactivated in a humid and high temperature environment, resulting in the attenuation of the release of negative ions. Cerium doping can form a stable Ce-O-Fe structure, inhibiting Oxidation, extending the life of the material.

[0032] It should be explained that in this application / The mechanism of action of heterojunction photocatalytic materials is: and A pn heterojunction is formed, and a built-in electric field is formed at the interface. Under the excitation of visible light (λ≥420 nm): The electrons in the valence band (VB) jump to the conduction band (CB), and the holes generated migrate to VB; The CB electrons are transferred to CB, forming a Z-type heterojunction carrier transport path. Photogenerated electrons ( ) and holes ( ) Improve separation efficiency, reduce recombination, and extend the life of active particles.

[0033] Secondly, during the photocatalytic process, Surface Direct oxidation Generate OH radicals and of reduction generate· Superoxide radicals, these active oxygen species further react with React, generate more , and generate negative oxygen ions through the following pathways.

[0034] (Main Path) Synergistic mechanism: electric field-photocatalytic coupling effect (1) Electric field enhanced photocatalytic efficiency The electrostatic field of tourmaline can drive the directional migration of photogenerated carriers and inhibit recombination. For example, Under the action of the electric field, it accumulates on the surface of the material and accelerates The reduction reaction increases Spawn rate.

[0035] (2) Photocatalysis maintains tourmaline activity Photocatalytic materials decompose organic pollutants in the air (such as formaldehyde, VOC), reduce their adsorption on the tourmaline surface, avoid covering the active sites, and ensure that tourmaline continuously releases negative ions.

[0036] (3) Energy transfer and resonance effect Surface plasmon resonance (SPR) effect of cerium-doped tourmaline and The localized surface plasmon resonance (LSPR) coupling enhances the visible light absorption range (extended to 600 nm) and improves the utilization rate of light energy.

[0037] Negative ion release test: Select the cerium-doped modified tourmaline powder in this application + / As heterojunction photocatalytic material, the tourmaline powder of the Tolin brand on the market was selected, and the test results are shown in Table 1 below.

[0038] Table 1

[0039] Example 2: The difference between this example and Example 1 is that in this example, 15 parts by weight of cerium-doped modified tourmaline powder and 20 parts by weight of photocatalytic material are used, and other conditions are the same.

[0040] Example 3: The only difference between this example and Example 1 is that in this example, 20 parts by weight of cerium-doped modified tourmaline powder and 25 parts by weight of photocatalytic material are used, and other conditions are the same.

[0041] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example is a blank control group, and the bamboo fiberboard coated with Yudong high-tech far-infrared negative oxygen ion coating is directly used, and other conditions are the same.

[0042] Comparative Example 2: The only difference between this comparative example and Example 1 is that in this comparative example, tourmaline powder of the brand Tolin on the market is added, and other conditions are the same.

[0043] Comparative Example 3: The difference between this comparative example and Example 1 is that no photocatalytic material is added in this comparative example, and other conditions are the same.

[0044] Test Example 1: Samples were prepared according to Examples 1-3 and Comparative Examples 1-3, and the samples were tested according to JC / T 2110-2012 standard. The test results were monitored in a sealed cabin for 30 days (temperature 25°C, humidity 50%) as shown in Table 2: Table 2:

[0045] From the data in Table 2, we can see that: The more parts by weight of cerium-doped modified tourmaline powder and photocatalytic material there are within the scope of this application, the better the negative ion release. When the tourmaline powder is 20 parts by weight and the photocatalytic material is 25 parts by weight, the better the negative ion release. It can be seen from the data of Comparative Example 3 that when no photocatalytic material is added, the negative ion release of the tourmaline powder will also be slightly reduced. However, as time goes by, the negative ion release will drop sharply, resulting in a large attenuation rate of the negative ion release. Therefore, the addition of photocatalytic material significantly improves the stability of negative oxygen ion release, and the 30-day attenuation rate is less than 10%.

[0046] In summary, the cerium-doped modified tourmaline / The synergistic effect of heterojunction photocatalytic materials releases negative oxygen ions up to , which is a significant improvement over traditional tourmaline coatings and has excellent long-term stability.

[0047] Test Example 2: According to GB / T 18883-2002 standard, initial formaldehyde concentration , visible light source (500 lux), the test results are as follows in Table 3: Table 3:

[0048] From the data in Table 3, we can see that: The more parts by weight of cerium-doped modified tourmaline powder and photocatalytic material are within the scope of this application, the better the formaldehyde degradation effect is. When the tourmaline powder is 20 parts by weight and the photocatalytic material is 25 parts by weight, the better the formaldehyde degradation effect is. It can be seen from the data of comparative example 3 that when no photocatalytic material is added, the formaldehyde degradation rate is less than 20%. Moreover, it can be seen from the data of comparative example 2 that when conventional tourmaline powder is combined with the photocatalytic material of this application, the formaldehyde degradation rate is less than 80%, and the effect is not ideal. Therefore, in this application, the surface plasmon resonance (SPR) effect of cerium-doped tourmaline is combined with The localized surface plasmon resonance (LSPR) coupling can enhance the visible light absorption range and improve the utilization rate of light energy, thereby further improving the formaldehyde degradation rate.

[0049] In summary, photocatalytic materials can decompose pollutants such as formaldehyde and TVOC under visible light, with a formaldehyde degradation rate of ≥90% (24 hours), achieving the dual functions of negative ion release and air purification.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Two-component negative oxygen ion water-based paint decorative board, characterized in that: It comprises a substrate and a functional coating coated on the surface of the substrate, wherein the functional coating is formed by mixing and curing component A and component B; Wherein, the component A comprises the following substances in parts by weight: 50-70 parts by weight of water-based paint, 10-20 parts by weight of cerium-doped modified tourmaline powder and 5-15 parts by weight of microcapsules; Wherein, the B component includes the following substances in parts by weight: 40-60 parts by weight of a waterborne epoxy curing agent and 10-25 parts by weight of a photocatalytic material.

2. The two-component negative oxygen ion water-based paint decorative board according to claim 1 is characterized in that: The doping amount of the cerium element in the cerium-doped modified tourmaline powder is 1% to 5% of the mass of the tourmaline, and the surface of the cerium-doped modified tourmaline powder is modified by a silane coupling agent KH-550.

3. The two-component negative oxygen ion water-based paint decorative board according to claim 1, characterized in that: The photocatalytic material is / Heterojunction photocatalytic materials, and / Heterojunction photocatalytic materials and The molar ratio is (1:1)~(1:2).

4. The two-component negative oxygen ion water-based paint decorative board according to claim 3 is characterized in that: Said / The method for preparing the heterojunction photocatalytic material comprises the following steps: a. Dispersed in deionized water and sonicated for 30 min; b. Then add The solution was stirred for 30 minutes. The molar ratio of Ag:Ti in the solution is 1:1~2:1; c. Then add dropwise Solution, adjust pH to 5-6, and react for 2 hours in the dark; d. Finally, the precipitate was collected by centrifugation, washed with deionized water and ethanol alternately for 3 times, and dried under vacuum at 60°C for 12 hours to obtain / Heterojunction photocatalytic materials.

5. The two-component negative oxygen ion water-based paint decorative board according to claim 1, characterized in that: The particle size of the microcapsule is 1-10 μm, the shell layer of the microcapsule is made of chitosan or polydopamine, and the shell thickness is 100-500 nm, and the mass ratio of nano calcium carbonate to silane coupling agent in the core material of the microcapsule is (2:1)-(5:1).

6. The two-component negative oxygen ion water-based paint decorative board according to claim 1, characterized in that: The water-based paint is a two-component polyurethane water-based paint.

7. The two-component negative oxygen ion water-based paint decorative board according to claim 1, characterized in that: The substrate is a bamboo fiberboard, a calcium silicate board or a decorative artificial board, and has a thickness of 3 to 20 mm.

8. The method for preparing a two-component negative oxygen ion water-based paint decorative board according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Substrate pretreatment: The substrate surface is treated with atmospheric pressure cold plasma, and the treatment gas is a mixture of argon and oxygen; S2, preparation of component A: dispersing cerium-doped modified tourmaline powder and two-component polyurethane water-based paint through a high shear emulsifier, and then adding microcapsules for ultrasonic mixing; S3, preparation of component B: mixing the photocatalytic material with water, then adding the waterborne epoxy curing agent, and ball milling for 2-4 hours; S4, coating: mixing component A and component B in proportion online through a static mixer, and coating the mixture onto the pretreated substrate surface through an electrostatic spraying device; S5. Curing: First use UV-LED light source to irradiate for 10 to 30 seconds for pre-curing, and then cure in a far-infrared radiation heating device for 2 to 4 hours to form a two-component negative oxygen ion water-based paint decorative board.

9. The method for preparing a two-component negative oxygen ion water-based paint decorative board according to claim 8, characterized in that: The voltage of the electrostatic spraying in step S4 is 40-80 kV, the distance between the spray gun and the substrate is 20-40 cm, and the spraying gas pressure is 0.3-0.6 MPa.

10. The method for preparing the two-component negative oxygen ion water-based paint decorative board according to claim 8, characterized in that: The surface roughness Ra of the substrate after the cold plasma treatment in step S1 is 0.5-2 μm, and the surface oxygen content increases by 20%-40%.

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