Preparation method of formaldehyde removal coating based on plasmon effect

Abstract

The invention relates to a preparation method of a formaldehyde removal coating based on a plasmon effect, and belongs to the technical field of coating formaldehyde removal, and the preparation method comprises the following steps: step 1) preparing a substrate of the coating, and cleaning the whole substrate; 2) placing the coating on a substrate, mixing the plasmon material and the coating to form a coating for removing formaldehyde, and placing the whole coating for removing formaldehyde under light for illumination; or the plasmon material is added into the coating to be mixed to form the coating for removing the formaldehyde, the coating for removing the formaldehyde is coated on the substrate, and the whole coating for removing the formaldehyde is placed under light for illumination; the method has the beneficial effects that the material with the plasmon effect is doped into the coating to form the coating for removing the formaldehyde, the volatilization of the formaldehyde and the temperature are in a positive phase relationship, the plasmon material is irradiated by laser, and the plasmon material generates a photothermal effect to enable the temperature of the coating to rise, so that efficient degradation of the formaldehyde in the coating is promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of coating and formaldehyde removal, and particularly relates to a method for preparing formaldehyde-removing coating based on plasmon effect. Background Art

[0002] Indoor air quality directly affects human physical and mental health, and has a great impact on human activities. With the modernization and industrialization of society, indoor air pollution is becoming more and more serious. With the improvement of living standards and material conditions, people have higher requirements for indoor environment. Paints contain a lot of formaldehyde due to the process and ingredients. Paints are an important source of formaldehyde, causing serious indoor pollution. Long-term exposure to formaldehyde-contaminated air will damage the respiratory system, nervous system, cardiovascular system, skin and other human systems and tissues, destroy the human immune system, and cause allergies, asthma, leukemia and even cancer.

[0003] For formaldehyde pollutants, physical methods such as ventilation and adsorption can be used to remove them; biological methods such as plant methods and microbial methods can be used to remove them; chemical methods such as chemical solution absorption and plasma methods can be used to remove them; catalytic oxidation degradation methods such as ozone catalytic oxidation and photocatalytic oxidation can be used to remove them. At the same time, a combination of methods can also be used to remove formaldehyde. However, the requirements for removing formaldehyde are usually high efficiency, natural and environmentally friendly, and simple and convenient. The previous methods often cannot meet the requirements at the same time due to their own limitations. Summary of the invention

[0004] The present invention solves the technical problem of how to efficiently remove formaldehyde in paint. The present invention provides a method for preparing a paint for removing formaldehyde based on the plasmon effect. Plasmon materials are added to the paint, and laser irradiates the paint with the plasmon materials added. The stronger the light intensity or light intensity of the laser, the higher the temperature rise of the plasmon material, the faster the formaldehyde volatilizes from the paint, and the formaldehyde removal effect of the paint is improved.

[0005] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0006] A method for preparing a formaldehyde-removing coating based on a plasmon effect comprises the following steps:

[0007] Step 1): Prepare the base for the coating and clean the base as a whole;

[0008] Step 2): placing the coating on a substrate, and then mixing the plasmon material and the coating to form a formaldehyde-removing coating, and placing the entire formaldehyde-removing coating under light for illumination.

[0009] Optionally, a wood board is used as the substrate of the coating, gold nanorods are used as the plasmon material, and the concentration of the gold nanorods in the coating is 6 μg / cm 2 .

[0010] Optionally, in step 2), the illumination uses simulated sunlight or laser, and the simulated sunlight or laser emitted by the laser is irradiated on the formaldehyde-removing paint.

[0011] Furthermore, the laser emits laser light with a wavelength of 0-808nm.

[0012] Optionally, in step 2), the coating is one of white paint, yellow paint, red paint, oil-soluble wood wax oil or water-soluble wood wax oil, and each coating is mixed with the plasmon material respectively.

[0013] Optionally, in step 2), the paint is placed in a simulated environmental chamber, the temperature in the simulated environmental chamber is set within the range of 24°C-26°C, the paint is first exposed to 0Sum and 1Sum light respectively, and then the formaldehyde-removing paint after the gold nanorods and the paint are mixed is exposed to 0Sum and 1Sum light respectively, and the formaldehyde concentration and temperature of the formaldehyde-removing paint are tested within 0h-12h.

[0014] A method for preparing a formaldehyde-removing coating based on a plasmon effect comprises the following steps:

[0015] Step 1'): Prepare the base for the coating and clean the base as a whole;

[0016] Step 2'): adding a plasmonic material to a coating to form a formaldehyde-removing coating, applying the formaldehyde-removing coating on a substrate, and placing the entire formaldehyde-removing coating under light for illumination.

[0017] Optionally, in step 2'), the formaldehyde-removing paint is placed in a simulated environmental chamber, the temperature in the simulated environmental chamber is set within the range of 24°C-26°C, the formaldehyde-removing paint is exposed to 0Sum and 1Sum light respectively, and the formaldehyde concentration and temperature of the formaldehyde-removing paint are tested within 0h-12h.

[0018] Beneficial effects of the present invention:

[0019] 1. The method of removing formaldehyde from the paint of the present invention is to add a material with a plasmon effect into the paint to form a formaldehyde-removing paint. Since the volatilization of formaldehyde and temperature are in a positive relationship (i.e., the higher the temperature, the faster the formaldehyde volatilizes, and the lower the temperature, the slower the formaldehyde volatilizes), the plasmon material is irradiated with a laser, and the plasmon material produces a photothermal effect (the laser irradiates the plasmon material to cause the plasmon material to generate heat) to increase the temperature of the paint, thereby promoting the degradation of formaldehyde in the paint. Compared with the existing physical method of removing formaldehyde, which has low efficiency and long time, the biological method has high environmental requirements, and the chemical method may cause secondary pollution, the present invention uses a material with a plasmon effect to produce a photothermal effect under the condition of light, is natural and environmentally friendly, and the wavelength and intensity of the light are selective, which can promote the volatilization of formaldehyde in the paint. The new paint mixed with the plasmon material and the paint of the present invention has a long-term formaldehyde removal effect.

[0020] 2. The present invention utilizes plasmon materials added to coatings, and laser irradiates the coatings with added plasmon materials. At the same time, the laser irradiates the plasmon materials. The stronger the light intensity or light intensity of the laser, the higher the temperature rise of the plasmon materials, which makes the temperature rise of the coating also higher, the formaldehyde volatilizes faster from the coating, and the formaldehyde removal effect of the coating is improved.

[0021] 3. The present invention utilizes a formaldehyde removal paint formed by mixing plasmon materials and paint. Different plasmon materials have different resonant wavelengths with different lasers, and different laser wavelengths cause different plasmon materials to produce different absorption wavelengths. Plasmon materials that absorb different light wavelengths are selected according to the wavelength of the laser. The intensity of the laser wavelength absorbed by the plasmon material is positively correlated with the concentration of the plasmon material itself. Adding more plasmon materials can improve the absorption of high-intensity light. The intensity of light received by the plasmon material and the concentration of the plasmon material are also selected according to actual conditions. The stronger the light intensity, the stronger the plasmon resonance, and the more obvious the photothermal effect produced. Adding an appropriate amount of plasmon material to the paint does not have an observable effect on the properties of the paint itself, such as color. Compared with existing formaldehyde removal methods, the present invention overcomes the problems of traditional methods being time-consuming, inefficient, and prone to secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the volatilization of formaldehyde in the coating without adding gold nanorods in the present invention when there is light and when there is no light;

[0024] Figure 2 A schematic diagram of the volatilization of formaldehyde in the coating containing gold nanorods when the coating of the present invention is placed on a substrate and gold nanorods are added to the coating under light and without light;

[0025] Figure 3 A schematic diagram of the volatilization of formaldehyde in the coating containing the gold nanorods when the coating containing the gold nanorods is placed on a substrate and when there is light and no light;

[0026] Figure 4 It is a schematic diagram of the temperature fields formed by the gold nanorods of the present invention after being mixed with the five coatings, and the temperature fields formed by the five coatings themselves;

[0027] Figure 5 This is a schematic diagram of the simulated environment chamber of the present invention;

[0028] Figure 6 This is an experimental data chart of comparing the temperature and formaldehyde concentration of the coatings with different components at different times in a simulated environmental chamber using different lighting conditions. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] Example 1

[0031] like Figure 2 As shown, this embodiment provides a method for preparing a formaldehyde-removing coating based on a plasmon effect, comprising the following steps:

[0032] Step 1): Prepare the base for the coating and clean the base as a whole;

[0033] Step 2): placing the coating on a substrate, and then mixing the plasmon material and the coating to form a formaldehyde-removing coating, and placing the entire formaldehyde-removing coating under light for illumination.

[0034] Figure 1 The coating is a coating without adding gold nanorods (gold nanorods can be small rod-shaped solid structures) on the substrate. Specifically, the coating is directly applied on the substrate. When there is no light, the formaldehyde in the coating evaporates slowly. After being exposed to light, the formaldehyde in the coating evaporates faster.

[0035] Figure 2 It is based on the method that after the coating is placed on the substrate, the plasmonic material is added to the substrate and mixed with the coating to form a coating that removes formaldehyde; Figure 2The invention relates to a coating with gold nanorods added to a substrate. Specifically, the coating is applied to a substrate, and then the gold nanorods are mixed into the coating to form a formaldehyde-removing coating. In the absence of light, the formaldehyde in the formaldehyde-removing coating evaporates more slowly than that in the coating without gold nanorods added. After the formaldehyde-removing coating is exposed to light, the formaldehyde in the formaldehyde-removing coating evaporates faster than that in the coating without gold nanorods added.

[0036] Figure 2 Relative to Figure 1 In particular, gold nanorods are mixed in the paint to form a formaldehyde-removing paint, and after the formaldehyde-removing paint is exposed to light, the formaldehyde in the formaldehyde-removing paint volatilizes faster than the formaldehyde in the paint without adding gold nanorods after light exposure.

[0037] Figure 1 and Figure 2 The paint is placed on the substrate, but Figure 2 The gold nanorods are mixed into the paint on the substrate to form a formaldehyde-removing paint.

[0038] Example 2

[0039] like Figure 3 As shown, this embodiment provides a method for preparing a formaldehyde-removing coating based on a plasmon effect, comprising the following steps:

[0040] Step 1'): Prepare the base for the coating and clean the base as a whole;

[0041] Step 2'): adding a plasmonic material to a coating to form a formaldehyde-removing coating, applying the formaldehyde-removing coating on a substrate, and placing the entire formaldehyde-removing coating under light for illumination.

[0042] Figure 3 It is based on adding plasmon materials to paint to form a formaldehyde-removing paint, which is then applied to the substrate. Figure 3 Gold nanorods were added to the coating, Figure 2 The difference is that the paint is mixed with gold nanorods before being applied to the substrate.

[0043] In the absence of light, the formaldehyde in the formaldehyde-removing paint evaporates more slowly than the paint without gold nanorods added. However, after the formaldehyde-removing paint is exposed to light, the formaldehyde in the formaldehyde-removing paint evaporates faster than the formaldehyde in the paint without gold nanorods added after exposure to light.

[0044] Example 3

[0045] Based on Example 1 and Example 2, the present invention uses a wooden board as a substrate, the plasmon material is gold nanorods, the lighting used is simulated sunlight or a laser with a wavelength of 808nm, the five coatings are white paint, yellow paint, red paint, oil-soluble wood wax oil or water-soluble wood wax oil, and the five coatings are each mixed with gold nanorods to form five separate formaldehyde-removing coatings.

[0046] A laser with a wavelength of 808nm is used to irradiate gold nanorods. Regardless of whether the plasmon material is added to the paint to form a formaldehyde-removing paint and then the formaldehyde-removing paint is applied to the substrate, or the paint is placed on the substrate and then the plasmon material and the paint are mixed to form the formaldehyde-removing paint, the laser with a wavelength of 808nm irradiates the gold nanorods in the paint to quickly volatilize the formaldehyde in the formaldehyde-removing paint.

[0047] like Figure 4 Gold nanorods were mixed with one of the five paints to form a formaldehyde-removing paint and placed on a 10mm*10mm wooden board. The concentration of gold nanorods in the paint was 6μg / cm 2 . A laser with a resonance wavelength close to 808nm is irradiated to the formaldehyde-removing paint. The laser with a wavelength of 808nm is irradiated to the formaldehyde-removing paint. At the same time, the laser irradiates the gold nanorods. The gold nanorods resonate with the laser with a wavelength of 808nm, causing the gold nanorods to generate temperature and the formaldehyde-removing paint to have temperature, thereby forming a temperature field in the formaldehyde-removing paint. The laser irradiates the paint without adding gold nanorods, also causing the paint to have temperature, thereby forming a temperature field in the paint. However, the temperature field formed by the laser irradiating the paint without adding gold nanorods is weaker.

[0048] Example 4

[0049] Based on Examples 1-3, Figure 4 a1 and a2 are the temperature fields of white paint without gold nanorods and with gold nanorods added, b1 and b2 are the temperature fields of yellow paint without gold nanorods and with gold nanorods added, c1 and c2 are the temperature fields of red paint without gold nanorods and with gold nanorods added, d1 and d2 are the temperature fields of oil-soluble wood wax oil without gold nanorods and with gold nanorods added, and e1 and e2 are the temperature fields of water-soluble paint without gold nanorods and with gold nanorods added. It can be seen that the mixture of gold nanorods and paint, compared with the paint without gold nanorods, after the paint is added with gold nanorods, the plasmon effect of the gold nanorods causes the temperature of the material to rise significantly.

[0050] Example 5

[0051] Based on all the above embodiments, Figure 6As shown, the laser irradiates the paint that removes formaldehyde after the gold nanorods are mixed with the paint, or the laser irradiates the paint that the gold nanorods are not mixed with the paint. The paint that removes formaldehyde or the paint that the gold nanorods (AuNRs) are not mixed with the paint is applied on a wooden board and placed in a 1*1*1m simulated environment chamber (such as Figure 5 As shown in the figure, the temperature in the simulated environmental chamber is controlled at 25°C; the laser emitted by the laser is irradiated on the paint not mixed with the gold nanorods under the illumination of 0Sum and 1Sum (Sum represents the unit of light intensity), and the formaldehyde concentration and temperature at 0h and 12h are tested; the laser emitted by the laser is irradiated on the paint mixed with the gold nanorods and the paint under the illumination of 0Sum and 1Sum, and the formaldehyde concentration and temperature at 0h and 12h are tested.

[0052] Figure 6 There are 5 kinds of coatings, 5 kinds of coatings are added with gold nanorods and 5 kinds of coatings are not added with gold nanorods, and the 5 kinds of coatings are irradiated with light intensity of 0Sum and 1Sum respectively after adding gold nanorods, and the 5 kinds of coatings are irradiated with light intensity of 0Sum and 1Sum respectively without adding gold nanorods. After adding gold nanorods to the 5 kinds of coatings, the formaldehyde concentration and temperature at 0h and 12h are tested under the light intensity of 0Sum, and the formaldehyde concentration and temperature at 0h and 12h are tested after adding gold nanorods to the 5 kinds of coatings respectively under the light intensity of 1Sum; the formaldehyde concentration and temperature at 0h and 12h are tested under the light intensity of 0Sum for the 5 kinds of coatings without adding gold nanorods, and the formaldehyde concentration and temperature at 0h and 12h are tested for the 5 kinds of coatings without adding gold nanorods respectively.

[0053] Therefore, from Figure 6 It can be seen that when there is no light, the formaldehyde in the coating without adding plasmon materials evaporates slowly, and the formaldehyde in the coating with adding plasmon materials evaporates slowly;

[0054] When exposed to light, the volatilization rate of formaldehyde in the paint without adding plasmon materials is slower than the volatilization rate of formaldehyde in the paint with adding plasmon materials; as long as the plasmon material is added to the paint and the laser irradiates the paint with added plasmon material, and the laser irradiates the plasmon material at the same time, the stronger the light intensity or light intensity of the laser, the higher the temperature rise of the plasmon material, the higher the temperature rise of the paint, and the faster the formaldehyde evaporates from the paint.

[0055] The plasmon material is added to the coating according to different laser wavelengths, different coating colors, different substrates and different coating thicknesses, and different plasmon concentrations are added according to the temperature conditions of the photothermal effect generated by the plasmon resonance, and plasmon materials with different resonance wavelengths are selected.

[0056] The numerical values ​​for removing formaldehyde from coatings using the plasmon effect in the above-mentioned embodiment are merely exemplary and are not intended to be limiting. The numerical values ​​may be specifically set according to the specific conditions of the first embodiment.

[0057] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a formaldehyde-removing coating based on a plasmon effect, characterized in that: The steps include: Step 1): Prepare the base for the coating and clean the base as a whole; Step 2): placing the coating on a substrate, and then mixing the plasmon material and the coating to form a formaldehyde-removing coating, and placing the entire formaldehyde-removing coating under light for illumination.

2. The method for preparing a formaldehyde-removing coating based on a plasmon effect according to claim 1, characterized in that: The wood board is used as the substrate of the coating, and the gold nanorods are used as the plasmon material. The concentration of the gold nanorods in the coating is 6 μg / cm 2 .

3. The method for preparing a formaldehyde-removing coating based on a plasmon effect according to claim 1, characterized in that: In the step 2), the illumination is performed by simulating sunlight or laser, and the simulated sunlight or the laser emitted by the laser is irradiated on the formaldehyde-removing paint.

4. The method for preparing a formaldehyde-removing coating based on a plasmon effect according to claim 3, characterized in that: The laser emits laser light with a wavelength of 0-808 nm.

5. The method for preparing a formaldehyde-removing coating based on a plasmon effect according to claim 1, characterized in that: In the step 2), the coating is one of white paint, yellow paint, red paint, oil-soluble wood wax oil or water-soluble wood wax oil, and each coating is mixed with the plasmon material.

6. The method for preparing a formaldehyde-removing coating based on a plasmon effect according to claim 1, characterized in that: In the step 2), the paint is placed in a simulated environmental chamber, the temperature in the simulated environmental chamber is set within the range of 24°C-26°C, the paint is first exposed to 0Sum and 1Sum light respectively, and then the formaldehyde-removing paint after the gold nanorods and the paint are mixed is exposed to 0Sum and 1Sum light respectively, and the formaldehyde concentration and temperature of the formaldehyde-removing paint are tested within 0h-12h.

7. A method for preparing a formaldehyde-removing coating based on a plasmon effect, characterized in that: The steps include: Step 1'): Prepare the base for the coating and clean the base as a whole; Step 2'): adding a plasmonic material to a coating to form a formaldehyde-removing coating, applying the formaldehyde-removing coating on a substrate, and placing the entire formaldehyde-removing coating under light for illumination.

8. The method for preparing a formaldehyde-removing coating based on a plasmon effect according to claim 7, characterized in that: In the step 2'), the formaldehyde-removing paint is placed in a simulated environmental chamber, the temperature in the simulated environmental chamber is set within the range of 24°C-26°C, the formaldehyde-removing paint is exposed to 0Sum and 1Sum light respectively, and the formaldehyde concentration and temperature of the formaldehyde-removing paint are tested within 0h-12h.

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