Formaldehyde-removing and antibacterial stone plastic wallboard, preparation method and application thereof

Abstract

The application relates to the technical field of plates and plate preparation, in particular to a stone-plastic wallboard, a preparation method and application thereof. The stone-plastic wallboard comprises a base plate and a panel, the base plate is a polyvinyl chloride plate, the panel is a stone-plastic panel, the polyvinyl chloride plate is fixedly connected with the stone-plastic panel, a photocatalyst-quantum dot composite material is fixed on the surface of the stone-plastic panel, and the photocatalyst-quantum dot composite material comprises, in percentage by mass, 40-60% of nano-titanium dioxide, 30-50% of carbon quantum dots, 5-15% of a dispersing agent and 1-5% of silver salt. In the material, the nano-titanium dioxide is combined with the carbon quantum dots, and the dispersing agent and silver ions are additionally used to enhance the transmission of photo-generated electrons, inhibit the recombination of photo-generated electrons and holes, enhance the photocatalytic effect of the nano-titanium dioxide, accelerate the decomposition of volatile organic compounds under natural light alone, and thus the stone-plastic wallboard has the function of removing formaldehyde.

Description

Technical Field

[0001] This invention relates to the field of board technology and board preparation technology, and particularly to a formaldehyde-removing and antibacterial stone-plastic wall panel, its preparation method and its application. Background Technology

[0002] Formaldehyde is a colorless, pungent, and volatile gas that poses a significant threat to human health. Long-term exposure to formaldehyde can lead to cancer. In 2020, my country's production of engineered wood products reached 300 million cubic meters, and the production of wood and bamboo flooring reached 500 million square meters, with the total output value of the wood processing industry exceeding three trillion yuan. To protect the living environment and safeguard consumer health, the National Technical Committee for Standardization of Engineered Wood Products organized the formulation and revision of national standards such as "Formaldehyde Emission Limits for Engineered Wood Products and Their Products in Interior Decoration and Renovation Materials" (GB 18580), "Classification of Formaldehyde Emission from Engineered Wood Products and Their Products" (GB / T 39600-2021), and "Guidelines for Indoor Load-Bearing Capacity Limits of Engineered Wood Products Based on Limiting Formaldehyde Emissions" (GB / T 39598-2021). These standards aim to promote the development of the green engineered wood products industry and create more environmentally friendly and healthy indoor living spaces. Currently, the national standard for formaldehyde emission limits for wall panels is E1 (≤0.124 mg / m³). 3 Grade E0 (≤0.050mg / m³) 3 ) and ENF level (≤0.025mg / m 3 There are several grades. Among them, E1 grade is the national mandatory health standard and is the "safety standard line" for wood-based panels. Meeting the E0 grade means achieving "healthy and environmentally friendly" status, while ENF grade is the new national environmental standard for wood-based panels and is the highest level of environmental protection.

[0003] For ordinary families, wall panels occupy the largest proportion of the building area and are an important component of home decoration. Therefore, the quality and function of wall panels are closely related to residents' health. Currently, although the existing stone-plastic wall panel products on the market vary in materials and styles, they lack functional enhancements. Their main function remains that of interior decoration materials. There are almost no stone-plastic wall panels with built-in formaldehyde removal and antibacterial functions, which falls far short of meeting the needs of the majority of residents for functional stone-plastic wall panels and healthy homes. Summary of the Invention

[0004] The purpose of this invention is to address the issue mentioned in the background art that stone-plastic wall panels have limited functionality and lack self-formaldehyde removal and antibacterial functions. This invention proposes a formaldehyde-removing and antibacterial stone-plastic panel and its preparation method. The stone-plastic panel prepared by this method can decompose formaldehyde and purify the air itself.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A stone-plastic wall panel includes a base layer and a surface layer. The base layer is a polyvinyl chloride (PVC) board, and the surface layer is a stone-plastic decorative panel. A photocatalyst-quantum dot composite material is fixed to the surface of the stone-plastic decorative panel. The components of the photocatalyst-quantum dot composite material include, by mass percentage:

[0007] Nano titanium dioxide 40-60%,

[0008] Carbon quantum dots 30-50%,

[0009] Dispersant 5-15%, silver salt 1-5%.

[0010] In existing technologies, titanium dioxide acts as a photocatalyst to catalyze the conversion of water molecules and oxygen in the air into strong oxidizing substances, thereby achieving the effects of decomposing organic matter and killing bacteria. However, all of these processes require sufficient light, especially ultraviolet light. This invention addresses this issue by combining nano-titanium dioxide with carbon quantum dots to compensate for the lack of ultraviolet light. Simultaneously, dispersants and silver salts are added to enhance the transmission of photogenerated electrons and inhibit the recombination of photogenerated electrons and holes, thereby enhancing the photocatalytic effect of the nano-titanium dioxide. The carbon quantum dots are selected to be capable of emitting ultraviolet light.

[0011] Furthermore, a PVC protective film is also adhered to the surface of the stone-plastic decorative panel, which can be removed after installation to prevent dust from settling and to avoid contamination with paint or coatings.

[0012] Furthermore, a PE film is adhered to the surface of the polyvinyl chloride (PVC) sheet, and silver ions are sprayed onto the surface of the PE film. A circular hole is formed inside the PVC sheet, and an activated carbon layer is adhered to the inner wall of the circular hole. Calcium chloride particles are filled inside the circular hole. A snap-fit ​​pin is fixedly connected to one side of the PVC sheet, and a snap-fit ​​ear is fixedly connected to the other side. A snap-fit ​​groove is formed on the surface of the snap-fit ​​ear, and the snap-fit ​​pin is adapted to the snap-fit ​​groove. The cross-section of the snap-fit ​​pin and the snap-fit ​​groove is an isosceles trapezoid. Silver ions are sprayed onto the surface of the activated carbon layer and the calcium chloride particles.

[0013] In this invention, the nano-titanium dioxide particles have a diameter of 1-30 nm, more preferably 3-5 nm; the carbon quantum dots may also be doped with nitrogen, with a nitrogen doping mass percentage of 1-5%, and the preparation process of the nitrogen-doped carbon quantum dots includes the following steps:

[0014] S1. Mix 10-15 mL of anhydrous ethanol, 1-2 g of vanillin, and 10-15 mL of ethylenediamine, sonicate for 5-20 min, react at 200 °C for 6 h, and cool to room temperature to obtain a suspension.

[0015] S2. The suspension was filtered through a 0.1 μm microporous membrane, and the filtrate was diluted with water until it turned light yellow. It was then centrifuged at 10,000 r / min for 10 min to obtain a grayish-white precipitate. The precipitate was then washed and freeze-dried to obtain nitrogen-doped carbon quantum dots.

[0016] Furthermore, the components of the photocatalyst-quantum dot composite material, by mass percentage, are:

[0017] Nano titanium dioxide 50%,

[0018] Carbon quantum dots 40%,

[0019] 7% sodium polycarboxylate and 3% silver nitrate.

[0020] In this invention, the dispersant is selected from at least one of sodium polycarboxylate and sodium sulfonate, and the silver salt is selected from at least one of silver nitrate, silver acetate, and silver trifluoroacetate. The preparation method of the photocatalyst-quantum dot composite material of this invention includes the following steps:

[0021] S1. Mix nano-titanium dioxide, carbon quantum dots, dispersant, silver salt, and deionized water, and ultrasonically vibrate for 10 minutes to obtain a mixture.

[0022] S2. The mixture is centrifuged to obtain a solid substance, which is then dried to obtain a photocatalyst-quantum dot composite material.

[0023] Furthermore, the carbon quantum dots emit wavelengths of 200-480 nm.

[0024] The ultraviolet light range is 200-400 nm, and in this invention, the carbon quantum dots preferably emit wavelengths between 200-480 nm, falling within the ultraviolet and blue light regions. The wavelength of the emitted light can be adjusted by changing the particle size of the quantum dots, resulting in emitted light with higher color purity. That is, by selecting a suitable carbon quantum dot particle size, ultraviolet light with an emission wavelength in the 200-400 nm range can be obtained.

[0025] Furthermore, the carbon quantum dots have a particle size of 1-50 nm, preferably 2-5 nm.

[0026] Furthermore, the surface of the stone-plastic decorative panel has micropores, and the photocatalyst-quantum dot composite material is fixed in the gaps or inside the micropores.

[0027] Furthermore, the diameter of the micropores is 0.01-2 micrometers.

[0028] A method for preparing the stone-plastic wall panel as described above, the method comprising the following steps:

[0029] 1) The polyvinyl chloride board is hot-pressed and flat-laid with stone-plastic decorative panel to obtain PVC base stone-plastic board;

[0030] 2) Roughen the surface of the PVC baseboard;

[0031] 3) The photocatalyst-quantum dot composite material is embedded in the surface of a PVC-based stone-plastic board to obtain a stone-plastic wall panel;

[0032] The surface roughening treatment mentioned in step 2) is to roll the surface of the stone-plastic decorative panel of the PVC base stone-plastic board using a micron-sized needle roller.

[0033] Furthermore, the inlay process is at least one of spraying, roller coating, immersion, vapor deposition, and transfer printing.

[0034] This invention discloses the application of a photocatalyst-quantum dot composite material in the catalytic decomposition of organic matter. The photocatalyst-quantum dot composite material accelerates the catalytic decomposition of volatile organic compounds and organic dyes under natural light. Further, the volatile organic compounds and organic dyes are formaldehyde and rhodamine B, respectively. The photocatalyst-quantum dot composite material of this invention can be widely used in industrial plants, hotels, offices, commercial spaces, residences, communities, schools, and other locations.

[0035] The photocatalyst-quantum dot composite material described in this invention is based on the principle of photocatalysis and can degrade most organic compounds. Formaldehyde is a colorless and odorless gas, and its photocatalytic degradation process in the composite material shows no obvious contrast. However, the organic dye Rhodamine B dissolves in water to form a red solution, and its photocatalytic degradation process in the composite material shows a color change from red to colorless, with a clear contrast between the initial and final states.

[0036] The beneficial effects of this invention are as follows: 1. The stone-plastic wall panel of this invention incorporates a photocatalyst-quantum dot composite material. In this material, nano-titanium dioxide is combined with carbon quantum dots, and with the assistance of dispersants and silver ions, the transmission of photogenerated electrons is enhanced, the recombination of photogenerated electrons and holes is inhibited, and the photocatalytic effect of nano-titanium dioxide is enhanced. Thus, this composite material can accelerate the decomposition of volatile organic compounds under natural indoor light alone without the need for additional ultraviolet light sources. Therefore, the stone-plastic wall panel of this invention has the function of removing formaldehyde. Under the same natural light irradiation, the decomposition efficiency of the photocatalyst-quantum dot composite material of this invention is nearly 1.25 times higher than that of titanium dioxide photocatalyst material alone. The stone-plastic wall panel of this invention can almost completely degrade formaldehyde. At a degradation time of 114 hours, its formaldehyde degradation rate can reach 99.1%.

[0037] 2. Traditional photocatalytic materials require the purchase of an ultraviolet lamp for use. This invention eliminates the need for an ultraviolet lamp, as the ultraviolet light emitted by the quantum dots supplies the photocatalytic needs of the nano-titanium dioxide. The photocatalyst-quantum dot composite material described in this invention breaks the dependence of traditional photocatalytic materials on an external ultraviolet light source, and its preparation steps are short, the operation is simple, the product has good stability, and it is easy to separate and purify. Attached Figure Description

[0038] Figure 1 The images show the exterior of Experiment Box 1 and Experiment Box 2.

[0039] Figure 2 This is an appearance drawing of the formaldehyde-removing and antibacterial stone-plastic wall panel (numbered SJHM-01) of the present invention.

[0040] Figure 3 This is a 200x magnified view of the formaldehyde-removing and antibacterial stone-plastic wall panel (number SJHM-01) of the present invention without the embedded photocatalyst-quantum dot composite material;

[0041] Figure 4 This is a 200x magnified view of the formaldehyde-removing and antibacterial stone-plastic wall panel (number SJHM-01) of the present invention.

[0042] Figure 5 This is an appearance drawing of the formaldehyde-removing and antibacterial stone-plastic wall panel (numbered SJHM-02) of the present invention.

[0043] Figure 6 This is a 200x magnified view of the formaldehyde-removing and antibacterial stone-plastic wall panel (number SJHM-02) of the present invention without the embedded photocatalyst-quantum dot composite material;

[0044] Figure 7 This is a 200x magnified view of the formaldehyde-removing and antibacterial stone-plastic wall panel (number SJHM-02) of the present invention.

[0045] Figure 8 This is an appearance drawing of the formaldehyde-removing and antibacterial stone-plastic wall panel (numbered SJHM-03) of the present invention.

[0046] Figure 9 This is a 200x magnified view of the formaldehyde-removing and antibacterial stone-plastic wall panel (number SJHM-03) of the present invention without the embedded photocatalyst-quantum dot composite material;

[0047] Figure 10 This is a 200x magnified view of the formaldehyde-removing and antibacterial stone-plastic wall panel (number SJHM-03) of the present invention.

[0048] Figure 11 This is a comparison chart of the degradation of Rhodamine B by Rhodamine B (No. 1) and single nano-titanium dioxide (No. 2);

[0049] Figure 12 This is a comparison chart of the degradation of Rhodamine B (No. 1) and composite material TiC-04 (No. 3).

[0050] Figure 13 The degradation time of Rhodamine B by each component and the photocatalyst-quantum dot composite material;

[0051] Figure 14 This is a comparison of the degradation time of Rhodamine B based on the amount of photocatalyst-quantum dot composite material added. Detailed Implementation

[0052] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] The present invention will now be further illustrated with specific examples. The following embodiments are only for explaining the present invention and do not constitute a limitation thereof. The test samples and test procedures used in the following embodiments include the following (if the specific experimental conditions are not specified in the embodiments, they are usually performed according to conventional conditions or the conditions recommended by the reagent company; the reagents, consumables, etc. used in the following embodiments can be obtained commercially unless otherwise specified).

[0055] In this invention, the photocatalyst-quantum dot composite material is used to degrade organic matter such as formaldehyde. However, formaldehyde is a colorless gas, and the degradation effect is not easy to observe. Therefore, the catalytic degradation performance of the photocatalyst-quantum dot composite material with red Rhodamine B dye as the degradation target was also tested.

[0056] Comparative Example 1:

[0057] Preparation of nano-titanium dioxide aqueous solution:

[0058] Take 10 ml of deionized water and 20 mg of nano titanium dioxide, and sonicate for 5 min to obtain nano titanium dioxide aqueous solution (No. Ti-01).

[0059] Evaluation of degradation effect:

[0060] A mixture of nano-titanium dioxide aqueous solution and Rhodamine B was prepared. The mixture was placed 15cm away from a 254nm ultraviolet light source. When the mixture became colorless, Rhodamine B was completely degraded. The time it took for the mixture to become colorless was the time for nano-titanium dioxide to catalyze the degradation of Rhodamine B. The shorter the time, the stronger the degradation ability.

[0061] Comparative Example 2:

[0062] Similar to Comparative Example 1, the difference is that the mixture was placed 15cm away from a 365nm ultraviolet lamp light source.

[0063] Comparative Example 3:

[0064] Similar to Comparative Example 1, the difference is that the mixture was placed 15cm away from a 245+365nm superimposed ultraviolet lamp source.

[0065] Comparative Example 4:

[0066] Similar to Comparative Example 1, the difference is that the mixture was placed under natural indoor light.

[0067] Comparative Example 5:

[0068] Preparation of carbon quantum dot aqueous solution:

[0069] S1. Mix 500 mg vanillin, 5 ml ethylenediamine and 50 ml anhydrous ethanol, sonicate for 10 min, place in a reaction vessel and react at 200 °C for 6 hours, then cool to room temperature to obtain a suspension.

[0070] S2. Filter the suspension through a 0.1 μm microporous membrane to remove insoluble matter, then dilute the filtrate with 250 ml of deionized water until it turns light yellow. Centrifuge at 10000 r / min for 10 min to obtain a grayish-white precipitate, wash and freeze-dry to obtain carbon-nitrogen quantum dots.

[0071] S3. Mix 20 mg of carbon-doped nitrogen quantum dots with 10 ml of deionized water and sonicate for 5 min to obtain carbon quantum dot aqueous solution (QD-01).

[0072] Comparative Example 6:

[0073] Preparation of dispersant aqueous solution:

[0074] Mix 10 ml of deionized water and 20 mg of sodium polycarboxylate, and stir for 1 min to obtain an aqueous dispersant solution (number FS-01).

[0075] Comparative Example 7:

[0076] Preparation of silver salt aqueous solution

[0077] Mix 10 ml of deionized water and 20 mg of silver nitrate, and stir for 1 min to obtain a silver salt aqueous solution (YY-01). Comparative Example 8:

[0078] Preparation of dispersant-silver salt mixed solution:

[0079] Mix 10 ml of deionized water, 20 mg of silver nitrate, and 20 mg of sodium polycarboxylate, and stir for 1 min to obtain a dispersant-silver salt mixed solution (number FY-01).

[0080] Evaluation of degradation effects of comparative examples 5-8:

[0081] The aqueous solution of carbon quantum dot or dispersant prepared in Comparative Examples 5-8 was mixed with Rhodamine B to obtain a mixed solution. The mixed solution was placed at a distance of 15 cm from a 254+365nm superimposed ultraviolet lamp source. When the mixed solution became colorless, the Rhodamine B was completely degraded. The time it took for the mixed solution to become colorless was the time for Rhodamine B to be degraded by nano-titanium dioxide. The shorter the time, the stronger the degradation ability.

[0082] Comparative Example 9:

[0083] Preparation of photocatalyst-quantum dot composite materials:

[0084] S1. Mix 80mg of nano titanium dioxide, 10mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0085] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 87mg of photocatalyst-quantum dot composite material (TiC-01).

[0086] Preparation of photocatalyst-quantum dot aqueous solution:

[0087] Mix 20mg of photocatalyst-quantum dot composite material with 10ml of deionized water and sonicate for 2min to obtain photocatalyst-quantum dot aqueous solution.

[0088] Comparative Example 10:

[0089] Preparation of photocatalyst-quantum dot composite materials:

[0090] S1. Mix 70mg of nano titanium dioxide, 20mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0091] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 89mg of photocatalyst-quantum dot composite material (TiC-02).

[0092] Comparative Example 11:

[0093] Preparation of photocatalyst-quantum dot composite materials:

[0094] S1. Mix 60mg of nano titanium dioxide, 30mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0095] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 90mg of photocatalyst-quantum dot composite material (TiC-03).

[0096] Comparative Example 12:

[0097] Preparation of photocatalyst-quantum dot composite materials:

[0098] S1. Mix 50mg of nano titanium dioxide, 40mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0099] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 91mg of photocatalyst-quantum dot composite material (TiC-04).

[0100] Comparative Example 13:

[0101] Preparation of photocatalyst-quantum dot composite materials:

[0102] S1. Mix 40mg of nano titanium dioxide, 50mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0103] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 90mg of photocatalyst-quantum dot composite material (TiC-05).

[0104] Comparative Example 14:

[0105] Preparation of photocatalyst-quantum dot composite materials:

[0106] S1. Mix 30mg of nano titanium dioxide, 60mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0107] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 89mg of photocatalyst-quantum dot composite material (TiC-06).

[0108] Comparative Example 15:

[0109] Preparation of photocatalyst-quantum dot composite materials:

[0110] S1. Mix 20mg of nano titanium dioxide, 70mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0111] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 88mg of photocatalyst-quantum dot composite material (TiC-07).

[0112] Comparative Example 16:

[0113] Preparation of photocatalyst-quantum dot composite materials:

[0114] S1. Mix 10mg of nano titanium dioxide, 80mg of carbon quantum dots, 9mg of sodium polycarboxylate, 1mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0115] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 87mg of photocatalyst-quantum dot composite material (TiC-08).

[0116] Comparative Example 17:

[0117] Preparation of photocatalyst-quantum dot composite materials:

[0118] S1. Mix 50mg of nano titanium dioxide, 40mg of carbon quantum dots, 7mg of sodium polycarboxylate, 3mg of silver nitrate, and 53ml of deionized water, and sonicate for 10min to obtain a mixture.

[0119] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 88mg of photocatalyst-quantum dot composite material (TiC-09).

[0120] Comparative Example 18:

[0121] Preparation of photocatalyst-quantum dot composite materials:

[0122] S1. Mix 50mg of nano titanium dioxide, 40mg of carbon quantum dots, 5mg of sodium polycarboxylate, 5mg of silver nitrate, and 55ml of deionized water, and sonicate for 10min to obtain a mixture.

[0123] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 87mg of photocatalyst-quantum dot composite material (TiC-10).

[0124] Comparative Example 19:

[0125] Preparation of photocatalyst-quantum dot composite materials:

[0126] S1. Mix 50mg of nano titanium dioxide, 40mg of carbon quantum dots, 3mg of sodium polycarboxylate, 7mg of silver nitrate, and 52ml of deionized water, and sonicate for 10min to obtain a mixture.

[0127] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 87mg of photocatalyst-quantum dot composite material (TiC-11).

[0128] Comparative Example 20:

[0129] Preparation of photocatalyst-quantum dot composite materials:

[0130] S1. Mix 50mg of nano titanium dioxide, 40mg of carbon quantum dots, 1mg of sodium polycarboxylate, 9mg of silver nitrate, and 50ml of deionized water, and sonicate for 10min to obtain a mixture.

[0131] S2. Centrifuge the mixture to obtain a solid substance, wash and dry it to obtain 85mg of photocatalyst-quantum dot composite material (TiC-12).

[0132] Evaluation of degradation effect of Comparative Example 9-20:

[0133] A mixture of photocatalyst-quantum dot aqueous solution and Rhodamine B was prepared. The mixture was placed under natural indoor light. When the mixture became colorless, Rhodamine B was completely degraded. The time it took for the mixture to become colorless was the time for catalytic degradation of Rhodamine B. The shorter the time, the stronger the degradation ability.

[0134] Since ultraviolet light is harmful to the human body, natural light was used in comparison scales 9-20 to simulate a real home environment.

[0135] Table 1 shows the experimental light source and degradation time of Rhodamine B for the materials in Comparative Examples 1-20. All contents in the table are percentages, and the degradation time is in minutes. — indicates no degradation.

[0136] Table 1. Comparison of degradation times of Rhodamine B in Comparative Examples 1-20

[0137]

[0138]

[0139] A comparison of the degradation of Rhodamine B by Rhodamine B (No. 1) and single nano-titanium dioxide (No. 2) is shown in the figure. Figure 11 The degradation comparison of Rhodamine B by Rhodamine B (No. 1) and composite material TiC-04 (No. 3, Comparative Example 12) is shown in the figure. Figure 12 .

[0140] Figure 11 and Figure 12 It can be seen that, Figure 11 Single nano-titanium dioxide, under the assistance of an ultraviolet light source at a distance of 15 cm, achieved the degradation of Rhodamine B dye after 215 minutes. Figure 12 The nano-titanium dioxide-carbon quantum dot composite material achieved the degradation of Rhodamine B dye in 133 minutes without the assistance of an ultraviolet light source. This indicates that the quantum dot component in the TiC-04 (No. 3, Comparative Example 12) composite material has a significant ultraviolet luminescence effect. Furthermore, due to the close composite of quantum dots and nano-titanium dioxide, the ultraviolet light emitted by the quantum dots effectively enhances the photocatalytic performance of nano-titanium dioxide, thereby further shortening the degradation time of Rhodamine B dye.

[0141] Combination Figure 13 It is evident that titanium dioxide exhibits the strongest degradation ability for Rhodamine B under 254+365nm UV light. In this invention, the dispersant, carbon quantum dots, and silver salt do not individually contribute to the degradation of Rhodamine B. With a fixed amount of dispersant and silver salt, and a fixed total amount of carbon quantum dots and nano-titanium dioxide, the degradation ability of the photocatalyst-quantum dot composite material of this invention first increases and then decreases with increasing carbon quantum dot mass fraction, reaching its highest value at a carbon quantum dot:nano-titanium dioxide ratio of 4:5. Similarly, with a fixed amount of carbon quantum dots and nano-titanium dioxide, and a fixed total amount of dispersant and silver salt, the degradation ability of the photocatalyst-quantum dot composite material of this invention first increases and then decreases with increasing silver salt mass fraction, reaching its highest value at a dispersant:silver salt ratio of 7:3.

[0142] To verify the effect of the amount of photocatalyst-quantum dot composite material added (materials of comparative examples 13-18) on the degradation time of Rhodamine B, the following experiment was conducted.

[0143] Application Example 1:

[0144] Take 10 mg of photocatalyst-quantum dot composite material (TiC-09) and 10 ml of deionized water, mix them, and sonicate for 2 min to obtain photocatalyst-quantum dot aqueous solution (mass fraction 0.1%).

[0145] Application Example 2:

[0146] Take 40 mg of photocatalyst-quantum dot composite material (TiC-09) and 10 ml of deionized water, mix them, and sonicate for 2 min to obtain photocatalyst-quantum dot aqueous solution (mass fraction 0.4%).

[0147] Application Example 3:

[0148] Take 60 mg of photocatalyst-quantum dot composite material (TiC-09) and 10 ml of deionized water, mix them, and sonicate for 2 min to obtain photocatalyst-quantum dot aqueous solution (mass fraction 0.6%).

[0149] Application Example 4:

[0150] Take 80 mg of photocatalyst-quantum dot composite material (TiC-09) and 10 ml of deionized water, mix them, and sonicate for 2 min to obtain photocatalyst-quantum dot aqueous solution (mass fraction 0.8%).

[0151] Application Example 5:

[0152] Take 100mg of photocatalyst-quantum dot composite material (TiC-09) and 10ml of deionized water, mix them, and sonicate for 2min to obtain photocatalyst-quantum dot aqueous solution (1% by mass).

[0153] Application Example 6:

[0154] Take 200mg of photocatalyst-quantum dot composite material (TiC-09) and 10ml of deionized water, mix them, and sonicate for 2min to obtain photocatalyst-quantum dot aqueous solution (2% by mass).

[0155] The degradation effect evaluation method for the application examples is as described above, and the results are shown in Table 2.

[0156] Table 2 Comparison of the effect of photocatalyst-quantum dot composite material addition amount on the degradation time of Rhodamine B

[0157]

[0158] Table 2 combined with Figure 14 It can be seen that as the amount of photocatalyst-quantum dot composite material added increases, the degradation time of Rhodamine B decreases and the degradation ability increases. When a certain amount is added, the degradation effect no longer changes and tends to be stable. Considering the cost, the preferred amount of composite material added is 0.2-0.4%, which has good overall performance.

[0159] Stone-plastic wall panels:

[0160] The preparation method of stone-plastic decorative panel is as follows: a) Prepare the raw materials for the surface material, including 300 kg of marble powder and 4 kg of paraffin wax; b) Prepare the raw materials for the base material, including 320 kg of marble powder, 120 kg of polyvinyl chloride and 4 kg of paraffin wax; c) Make the stone-plastic decorative panel.

[0161] The preparation of the stone-plastic decorative panel in this invention is based on the manufacturing process of wear-resistant stone-plastic board (application number CN201610368423.8) and the production method of stone-plastic board (application number CN201610367592X).

[0162] In this invention, the vinyl chloride board is a PVC wall panel with antibacterial and bactericidal function (application number CN211949341U).

[0163] Using the preferred scheme in the above comparative examples, the photocatalyst-quantum dot composite material is prepared by the preparation method described in Comparative Example 17.

[0164] Example 1:

[0165] A method for preparing stone-plastic wall panels, comprising the following steps:

[0166] 1) PVC-based stone plastic board is obtained by hot-pressing polyvinyl chloride (PVC) sheet onto stone plastic decorative panel;

[0167] 2) A micron-sized needle roller is used to roll the PVC base plate once along the length and width directions to make the surface of the PVC base plate uniformly distributed with micropores.

[0168] 3) Mix the photocatalyst-quantum dot composite material with water to prepare a 0.8wt% photocatalyst-quantum dot composite material aqueous solution. Spray the photocatalyst-quantum dot composite material aqueous solution onto the surface of a PVC-based stone plastic board. Using an infrared lamp, attach a layer of PVC protective film to the dried PVC-based stone plastic board surface to obtain a formaldehyde-removing and antibacterial stone plastic wall panel (number SJHM-01).

[0169] Example 2:

[0170] A method for preparing stone-plastic wall panels, comprising the following steps:

[0171] 1) PVC-based stone plastic board is obtained by hot-pressing polyvinyl chloride (PVC) sheet onto stone plastic decorative panel;

[0172] 2) A micron-sized needle roller is used to roll the PVC base plate once along the length and width directions to make the surface of the PVC base plate uniformly distributed with micropores.

[0173] 3) Mix the photocatalyst-quantum dot composite material with water to prepare a 0.6wt% photocatalyst-quantum dot composite material aqueous solution. Evaporate the photocatalyst-quantum dot composite material aqueous solution onto the surface of a PVC-based stone plastic board. Dry it with a warm air blower. Then, attach a layer of PVC protective film to the surface of the dried PVC-based stone plastic board to obtain a formaldehyde-removing and antibacterial stone plastic wall panel (number SJHM-02).

[0174] Example 3:

[0175] A method for preparing stone-plastic wall panels, comprising the following steps:

[0176] 1) PVC-based stone plastic board is obtained by hot-pressing polyvinyl chloride (PVC) sheet onto stone plastic decorative panel;

[0177] 2) A micron-sized needle roller is used to roll the PVC base plate once along the length and width directions to make the surface of the PVC base plate uniformly distributed with micropores.

[0178] 3) Mix the photocatalyst-quantum dot composite material with water to prepare a 0.2wt% photocatalyst-quantum dot composite material aqueous solution. Roll the photocatalyst-quantum dot composite material aqueous solution onto the surface of a PVC-based stone plastic board and dry it with a warm air blower. Then, attach a layer of PVC protective film to the surface of the dried PVC-based stone plastic board to obtain a formaldehyde-removing and antibacterial stone plastic wall panel (number SJHM-03).

[0179] Formaldehyde removal performance evaluation test:

[0180] 1) Preparation of the experimental chamber:

[0181] like Figure 1As shown, eight PVC baseboards with a thickness of 0.8cm and a length and width of 50cm, processed by a micron-sized needle rolling machine, and four transparent acrylic sheets with a thickness of 0.2cm and a length and width of 50cm, were spliced ​​together to form two identical cubic experimental boxes with a side length of 50cm, labeled as Experiment Box No. 1 and Experiment Box No. 2. The transparent acrylic sheets were located at the front and top of the experimental boxes. Except for the four edges at the top of the experimental boxes, all other edges were glued with structural adhesive to seal the gaps.

[0182] 2) Preparation before the experiment:

[0183] The inner surfaces of Experiment Box 1 and Experiment Box 2 were sprayed with a 0.4% concentration of photocatalyst-quantum dot composite material aqueous solution and dried with a warm air blower. The transparent acrylic plate was not sprayed with the photocatalyst-quantum dot composite material aqueous solution. The transparent acrylic plate was then covered, and three edges of the two experimental boxes were sealed with wide tape. Then, different masses of formaldehyde standard solution (mass concentration 37%, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.) were accurately weighed using a bacterial culture bottle and placed into the two cubic experimental boxes respectively. The fourth edge was quickly sealed with wide transparent tape. The transparent acrylic plates of Experiment Box 1 and Experiment Box 2 were placed facing the window and 2 meters away from the window indoors. The boxes were sent for testing after 144 hours.

[0184] 3) Detection method:

[0185] The formaldehyde emission limits in wood-based panels and their products for interior decoration and renovation were determined by a third-party organization according to the methods specified in GB 18580-2017.

[0186] 4) Test results: The formaldehyde degradation rate of the functional stone-plastic wall panel is determined based on the difference between the initial formaldehyde concentration and the test concentration.

[0187] The formaldehyde degradation rate of test chamber No. 1 is 98.7%, and the formaldehyde degradation rate of test chamber No. 2 is 99.1%. This invention has excellent formaldehyde degradation ability.

[0188] Figure 2-4 The images shown are, respectively, the appearance of the stone-plastic wall panel of the present invention (numbered SJHM-01), a 200x magnified view of the panel without photocatalyst-quantum dot composite material, and a 200x magnified view after inlaying the photocatalyst-quantum dot composite material. Figure 5-7 The images shown are, respectively, the appearance of the stone-plastic wall panel of the present invention (numbered SJHM-02), a 200x magnified view of the panel without photocatalyst-quantum dot composite material, and a 200x magnified view after photocatalyst-quantum dot composite material is embedded. Figure 8-10The images shown are: an external view of the stone-plastic wall panel of the present invention (numbered SJHM-03); a 200x magnified view of the panel without photocatalyst-quantum dot composite material; and a 200x magnified view of the panel with photocatalyst-quantum dot composite material. It can be seen that the photocatalyst-quantum dot composite material is embedded in the micropores. Figure 2 , 5 As can be seen from Figure 8, although the surface is treated with a microporous needle roller machine, the surface is still smooth. Figure 3 , 6 As can be seen from Figure 9, after being processed by the microporous needle roller machine, the surface of the wall panel already has neatly arranged micropores. Figure 4 , 7 10. It can be seen that at least 50% of the micropores on the wall panel are covered with photocatalyst-quantum dot composite material. Even with frequent wiping, only the photocatalyst-quantum dot composite material outside the micropores can be removed, while most of the photocatalyst-quantum dot composite material inside the micropores has been fixed and is difficult to wipe off, thus playing a long-term and stable role in removing formaldehyde.

[0189] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0190] The above provides a detailed description of the formaldehyde-removing and antibacterial stone-plastic wall panel, its preparation method, and its applications provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A method of making a stone plastic wallboard, characterized by: The preparation method comprises the following steps: 1) hot pressing the polyvinyl chloride plate to the stone plastic veneer to obtain a PVC-based stone plastic plate; 2) roughening the surface of the PVC-based stone plastic plate by rolling the surface of the stone plastic veneer of the PVC-based stone plastic plate with a micron roller pin machine; 3) embedding the photocatalyst-quantum dot composite material on the surface of the PVC-based stone plastic plate to obtain a stone plastic wallboard; The stone plastic wallboard comprises a bottom layer and a surface layer, wherein the bottom layer is a polyvinyl chloride plate, and the surface layer is a stone plastic veneer, and the surface of the stone plastic veneer is fixed with the photocatalyst-quantum dot composite material, The components of the photocatalyst-quantum dot composite material comprise, by mass percentage: 40-60% of nano-titanium dioxide, 30-50% of carbon quantum dots, 5-15% of a dispersing agent, 1-5% of silver salt; The carbon quantum dots are further doped with nitrogen, and the mass percentage of the nitrogen doping is 1-5%, and the preparation process of the nitrogen-doped carbon quantum dots comprises the following steps: S1, mixing 10-15 mL of anhydrous ethanol, 1-2 g of vanillin and 10-15 mL of ethylenediamine, ultrasonic oscillation for 5-20 min, and then reacting at 200°C for 6 h to obtain a suspension liquid; S2, filtering the suspension liquid through a 0.1 μm microporous filter membrane, diluting the filtrate with water to a light yellow color, and centrifuging at 10000 r / min for 10 min to obtain a grayish white precipitate, which is then washed, freeze-dried to obtain nitrogen-doped carbon quantum dots.

2. The method of claim 1, wherein: The surface of the stone plastic veneer is further bonded with a layer of PVC protective film.

3. The method of claim 1, wherein: The surface of the polyvinyl chloride plate is bonded with a PE film, the surface of the PE film is sprayed with silver ions, the polyvinyl chloride plate has a circular hole in the inside, the inside wall of the circular hole is bonded with an activated carbon layer, the inside of the circular hole is filled with calcium chloride particles, one side of the polyvinyl chloride plate is fixedly connected with a buckle pin, the other side is fixedly connected with a buckle ear, the surface of the buckle ear is provided with a buckle groove, the buckle pin is connected with the buckle groove in a matched manner, the cross section of the buckle pin and the buckle groove is isosceles trapezoidal, and the surface of the activated carbon layer and the calcium chloride particles is sprayed with silver ions.

4. The method of claim 1, wherein: The components of the photocatalyst-quantum dot composite material comprise, by mass percentage: 50% of nano-titanium dioxide, 40% of carbon quantum dots, 7% of sodium polycarboxylate, 3% of silver nitrate.

5. The method of claim 1, wherein: The carbon quantum dots emit a wavelength of 200-480 nm.

6. The method of claim 1, wherein: The carbon quantum dots have a particle size of 1-50 nm.

7. The method of claim 1, wherein: The surface of the stone plastic veneer has micropores, and the photocatalyst-quantum dot composite material is fixed in the gap between the micropores or in the micropores.

8. The method of claim 7, wherein: The diameter of the micropores is 0.01-2 microns.

9. The method of claim 1, wherein: The embedding process is at least one of spraying, roller coating, soaking, evaporation, and transfer printing.

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