Composite wood floor with negative ion function and preparation method thereof

Abstract

The application discloses a kind of composite anion functional wood floor and preparation method thereof, belong to functional building board technical field.The floor uses the layered structure design of " gradient slow release and catalysis cooperation ", from top to bottom includes photocatalytic layer, texture layer, load base material layer and moisture-proof layer.Load base material layer is uniformly compounded with the synergistic anion generating material composed of modified tourmaline powder, rare earth salt and zeolite, and with the functional material of each layer above and below constitutes gradient release system.The application improves the stability, efficiency and adaptability to low humidity environment of anion release by material composite innovation and structure design, and simultaneously endows the floor with the ability of long-acting formaldehyde decomposition.The preparation process embeds functional material in base material, ensuring the durability of function and product integration.

Description

Technical Field

[0001] This invention belongs to the field of functional building materials technology, specifically relating to a composite negative ion functional wood flooring and its preparation method. Background Technology

[0002] With increasing public awareness of indoor environmental health, interior decoration materials with air purification functions have become a research hotspot. Negative ions, especially small-particle negative ions (i.e., light ions), have been proven to have positive effects such as settling particulate matter, inhibiting bacteria, and improving human physiological functions.

[0003] Currently, some wood flooring products with negative ion release functions have appeared on the market. The technologies used to achieve this can be mainly summarized into two categories: The first category involves simply adding natural mineral powders such as tourmaline and opal to the flooring adhesive or coating. These products have obvious drawbacks: the negative ion material has weak adhesion to the substrate and is easily lost during processing and use; the negative ion release efficiency is very unstable and heavily dependent on ambient humidity (the release amount decreases significantly when the humidity is low). Summary of the Invention

[0004] Based on this, the present invention provides a composite negative ion functional wood flooring and its preparation method. Through an innovative "gradient slow release and catalytic synergy" structural design, it solves the technical problems of large fluctuations in negative ion release efficiency with environmental humidity, short functional lifespan, and easy deactivation of functional materials.

[0005] In a first aspect, the present invention provides a composite negative ion functional wood flooring, which, from top to bottom, includes a photocatalytic layer, a texture layer, a load substrate layer and a moisture-proof layer; The photocatalytic layer comprises a blend of UV-curable resin and nano-photocatalytic materials, which is used to continuously decompose organic pollutants on the surface of the wood floor and provide activation energy for the negative ion release reaction. Both the load substrate layer and the moisture-proof layer include composite negative ion powder for stable release of negative ions; the textured layer includes a mixture of tourmaline powder and polyurethane adhesive for releasing negative ions. The composite negative ion powder comprises the following components by weight: 40-60 parts of tourmaline powder modified with silane coupling agent, 20-30 parts of inorganic salts of rare earth elements, and 10-20 parts of zeolite molecular sieve.

[0006] Furthermore, based on the mass of the load substrate layer, the proportion of composite negative ion powder in the load substrate layer is 6%-6.5%. In this invention, excessive amounts of composite negative ion powder can easily cause agglomeration, while insufficient amounts will not have an obvious effect and cannot achieve sustained release.

[0007] Furthermore, based on the mass of the moisture-proof layer, the composite negative ion powder content in the moisture-proof layer is 3%-5%; Furthermore, based on the mass of the textured layer, the polyurethane adhesive containing tourmaline powder accounts for 50%-60% of the textured layer, and the mass ratio of tourmaline powder to polyurethane adhesive is 1:20. In this invention, if the proportion of polyurethane adhesive containing tourmaline powder is too high, it is easy for the substrate or board to stick and bubble; if it is too low, the surface hardness is insufficient, and the upper and lower layers of the textured layer are easy to separate.

[0008] Furthermore, the mass ratio of the nano-photocatalytic material to the UV-curable resin is 1:50. The UV-curable resin is RPCURE 9092 from Gaomeng New Materials. Furthermore, the nano-photocatalytic material comprises nitrogen-doped titanium dioxide with a particle size of 10nm~30nm. The nitrogen-doped titanium dioxide used in this invention was purchased from Hangzhou Jiupeng New Materials Co., Ltd., model CY-TA10N. If the particle size of nitrogen-doped titanium dioxide is too large, the specific surface area is small, and the number of active sites is few, resulting in a significant decrease in catalytic activity. If the particle size is too small, it is prone to agglomeration, and due to the surface quantum size effect, the overall catalytic efficiency decreases instead of increasing.

[0009] Furthermore, the inorganic salts of the rare earth elements include at least one of cerium nitrate, lanthanum chloride, and europium yttrium nitrate. Rare earth elements, as highly efficient electronic additives, significantly reduce the energy required for water molecule ionization and improve the negative ion release efficiency in low-humidity environments.

[0010] Furthermore, the silane coupling agent is of model number KH-550 or KH-560.

[0011] Furthermore, the zeolite molecular sieve is clinoptilolite powder with a particle size of 200 mesh.

[0012] Furthermore, the particle size of the tourmaline powder is 300 mesh to 1250 mesh. Too large a mesh size results in an excessively large surface area, consuming too much KH550; too small a mesh size leads to excessively large particle size, resulting in a decrease in the negative ion effect.

[0013] Secondly, the present invention provides a method for preparing composite negative ion functional wood flooring, comprising the following steps: The pre-prepared composite negative ion powder is mixed evenly with wood fiber and adhesive, and then laid out and formed by a first hot pressing treatment to obtain the load substrate layer; wherein the adhesive includes isocyanate adhesive.

[0014] A textured layer and a photocatalytic layer are laid sequentially on top of the load-bearing substrate layer, and a moisture-proof layer is laid below. After a second hot-pressing process, a composite negative ion functional wood flooring is obtained. The preparation method of the composite negative ion powder includes: Tourmaline powder was mixed with a silane coupling agent and modified to obtain modified tourmaline powder. Rare earth element inorganic salts and zeolite molecular sieves are added to modified tourmaline powder and mixed evenly to obtain composite negative ion powder.

[0015] Furthermore, the mass ratio of the composite negative ion powder to wood fiber and adhesive is 8:100:(15-20). Furthermore, the mass ratio of tourmaline powder to silane coupling agent is 20:3. Using too much silane coupling agent can cause the polyurethane adhesive to cure prematurely, while using too little will result in an insignificant modification effect.

[0016] Furthermore, the mass ratio of the rare earth element inorganic salt, modified tourmaline powder, and zeolite molecular sieve is 4:(8-10):(2-3). This ratio was determined experimentally, primarily utilizing the synergistic effect of the three: the modified tourmaline powder provides the basic polarized electric field and radiation; the rare earth element inorganic salt acts as a highly efficient activator, transferring energy to the tourmaline and significantly improving its efficiency in ionizing air to generate negative ions; and the zeolite molecular sieve, due to its unique framework structure and adsorption properties, can not only adsorb and enrich air and water molecules to provide raw materials for the ionization reaction, but also act as a carrier to adsorb and load tourmaline and rare earth elements, preventing agglomeration and improving dispersibility. If the proportion of tourmaline powder is too low, the overall negative ion generation efficiency will be low; if the proportion of tourmaline powder is too high, it will darken the product color and increase costs. If the proportion of rare earth element inorganic salts is too high, it will increase costs and pose a radiation risk; if the proportion is too low, the activation effect will be limited. If the proportion of zeolite molecular sieve is too high, it will compress the ratio of tourmaline and rare earth, resulting in a decrease in the overall negative ion generation efficiency; if the proportion of zeolite molecular sieve is too low, tourmaline and rare earth are prone to agglomeration in the matrix.

[0017] Furthermore, the first hot pressing treatment temperature is 190-230℃ and the pressure is 4.5-6 MPa.

[0018] Furthermore, the second hot-pressing temperature is 180℃~220℃, the pressure is 3MPa~4MPa, and the temperature is lower than the first hot-pressing temperature, so that the polyurethane adhesive will not be over-cured and become brittle. The pressure is lower than the first hot-pressing pressure, so that the thickness and density of the substrate will not be affected while ensuring that each layer is tightly bonded.

[0019] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention constructs a “three-layer gradient composite” structure. The photocatalytic layer on the upper surface provides wear-resistant protection and is activated under visible light to continuously decompose organic pollutants (such as formaldehyde) attached to the floor surface and provide primary activation energy for the negative ion release reaction. The middle textured layer, impregnated with a mixture of tourmaline powder and polyurethane adhesive, constitutes the first gradient for negative ion release. The load substrate layer simultaneously uses rare earth element inorganic salts, modified tourmaline powder, and zeolite molecular sieves in a mass ratio of 4:(8-10):(2-3). Among them, the modified tourmaline powder provides persistent polarization and basic release, and the rare earth elements, as highly efficient electronic additives, significantly reduce the ionization of water molecules. Energy is required to improve the release efficiency in low-humidity environments. The zeolite carrier plays a role in adsorbing and slowly releasing moisture and regulating the reaction microenvironment. The synergistic effect of the three forms the second gradient for negative ion release. The moisture-proof layer also contains composite negative ion materials, forming the third gradient source. The "three-layer gradient composite" structure, combined with the synergistic system of rare earth, tourmaline and zeolite, ensures that different levels of materials are activated to release negative ions regardless of the ambient humidity, achieving a stable high negative ion concentration output (under standard conditions of temperature 23±2℃ and humidity 45±5%, the negative ion concentration at 20cm on the board surface can be stably maintained at 1500-2500 ions / cm³).

[0020] (2) The negative ion material of the present invention forms a chemical bond with the matrix and resin through the "core material mixing" and "surface modification" technologies, avoiding the problem of loss due to wear and cleaning caused by physical addition, and the functional life is synchronized with the physical life of the floor.

[0021] (3) Thorough purification: The dual mechanism of "release" and "catalytic decomposition" is combined. The surface nano-catalytic layer can continuously decompose gaseous pollutants such as formaldehyde, while the released negative ions can settle suspended particulate matter such as PM2.5, thus realizing multi-path synergistic purification of indoor pollutants.

[0022] (4) Safety and environmental protection: The whole process does not rely on power sources and does not produce ozone. All added materials are inorganic minerals, which are safe and non-toxic. The flooring does not contain formaldehyde and releases it, which meets the standards for green building materials. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the layered structure of the negative ion functional wood flooring of the present invention. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0025] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is also expected that ranges of 60~110 and 80~120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" means that all real numbers between "0~5" have been listed in this article, and "0-5" is just a shortened representation of these numerical combinations. In addition, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0026] Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions, and such technical solutions should be considered to be included in the disclosure of this application.

[0027] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions, and such technical solutions shall be deemed to be included in the disclosure of this application.

[0028] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0029] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0030] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0031] Unless otherwise specified, in this application, the terms "first," "second," "third," etc., are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0032] In this application, the terms "multiple", "various", etc., refer to two or more kinds.

[0033] Unless otherwise stated, the terms used in this application have the common meanings as commonly understood by those skilled in the art.

[0034] Unless otherwise stated, the values ​​of the parameters mentioned in this application can be determined using various testing methods commonly used in the art, for example, according to the testing methods given in the embodiments of this application.

[0035] In the description of this invention, tourmaline powder of model HY-X625 sold by Tianjin Hongyan Tianshan Stone Industry Nanotechnology Co., Ltd., polyurethane adhesive of model AQUENCE PL 3200-02 sold by Henkel, Germany, UV curing resin of model RPCURE 9092 sold by Gaomeng New Materials, and nitrogen-doped titanium dioxide of model CY-TA10N purchased from Hangzhou Jiupeng New Materials Co., Ltd. Unless otherwise specified, all reagents used are commercially available.

[0036] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

[0037] Example 1 A method for preparing a composite negative ion functional wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the weight of tourmaline powder) to carry out surface coating modification in a high-speed mixer; then add 20g of cerium nitrate and 15g of 200-mesh clinoptilolite powder, and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0038] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (abbreviated as MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm. The mass fraction of composite negative ion powder in the load substrate layer is 6.25%.

[0039] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0040] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0041] Example 2 A method for preparing a composite negative ion functional wood flooring includes the following steps: Preparation of composite negative ion powder: Take 40g of 300-mesh tourmaline powder and use KH-560 silane coupling agent (1.5% of the weight of tourmaline powder) to carry out surface coating modification in a high-speed mixer; then add 20g of lanthanum chloride and 10g of clinoptilolite powder (200-mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0042] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 250g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 190℃ and 4.5MPa for 8 min to form a load substrate layer with a thickness of 8mm. The mass fraction of composite negative ion powder in the load substrate layer is 6.0%.

[0043] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 4% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 180℃ and 3MPa for 40s to obtain composite negative ion functional wood flooring.

[0044] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0045] Example 3 A method for preparing a composite negative ion functional wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 1250 mesh tourmaline powder and perform surface coating modification in a high-speed mixer using KH-550 silane coupling agent (1.5% of the weight of tourmaline powder); then add 30g of yttrium europium nitrate and 20g of clinoptilolite powder (200 mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0046] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 150g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 230℃ and 6MPa for 8 min to form a load substrate layer with a thickness of 8mm. The mass fraction of composite negative ion powder in the load substrate layer is 6.5%.

[0047] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 5% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 220℃ and 4MPa for 40s to obtain composite negative ion functional wood flooring.

[0048] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0049] Example 4 The difference between Example 4 and Example 1 is that the manufacturing process of the load substrate layer is different, and the lamination temperature, time, and pressure are different.

[0050] A method for preparing a composite negative ion functional wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the weight of tourmaline powder) to carry out surface coating modification in a high-speed mixer; then add 20g of cerium nitrate and 15g of clinoptilolite powder (200-mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0051] Preparation of the load substrate layer: Mix 80g of composite negative ion powder with 1000g of dried wood shavings evenly, spray in 150g of environmentally friendly isocyanate adhesive (MDI), and after laying and pre-pressing, hot press at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0052] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 180℃ and 3MPa for 50s to obtain composite negative ion functional wood flooring.

[0053] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0054] Example 5 The difference between Example 5 and Example 1 is that the types and contents of negative ion generating materials contained in the textured layer and the moisture-proof layer are different.

[0055] A method for preparing a composite negative ion functional wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the weight of tourmaline powder) to carry out surface coating modification in a high-speed mixer; then add 20g of cerium nitrate and 15g of clinoptilolite powder (200-mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0056] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0057] Lamination: Decorative paper impregnated with polyurethane adhesive containing 4% composite negative ion powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 4% tourmaline powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0058] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0059] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the composite negative ion powder was not used in the load substrate layer.

[0060] A method for preparing wood flooring includes the following steps: Preparation of substrate layer: 1000g of dry wood fiber is sprayed into 200g of environmentally friendly isocyanate adhesive (MDI), and after laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load-bearing substrate layer with a thickness of 8mm.

[0061] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain wood flooring.

[0062] Post-processing: After 7 days of curing, the wood flooring can be processed into click-lock flooring.

[0063] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the tourmaline powder used in the preparation of the composite negative ion powder was not modified with a silane coupling agent.

[0064] A method for preparing wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder, add 20g of cerium nitrate and 15g of clinoptilolite powder (200-mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0065] Preparation of the load substrate layer: Mix 80g of negative ion powder with 1000g of dry wood fiber evenly, spray in 200g of environmentally friendly isocyanate adhesive (MDI), and after laying and pre-pressing, hot press at 210℃ and 4MPa for 8 min to make a load substrate layer with a thickness of 8mm.

[0066] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0067] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0068] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the modified tourmaline powder was used directly for the load substrate layer, and no composite negative ion functional powder was prepared.

[0069] A method for preparing wood flooring includes the following steps: Preparation of the load substrate layer: Take 500 mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the powder weight) to perform surface coating modification in a high-speed mixer. Take 80g of modified tourmaline powder and mix it evenly with 1000g of dry wood fiber. Spray in 200g of environmentally friendly isocyanate adhesive (MDI). After laying and pre-pressing, hot press at 210℃ and 4MPa for 8 min to make a load substrate layer with a thickness of 8mm.

[0070] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0071] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0072] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that modified tourmaline powder was not used in the preparation of the composite negative ion powder.

[0073] A method for preparing wood flooring includes the following steps: Preparation of composite negative ion powder: Take 20g of cerium nitrate and 15g of clinoptilolite powder (200 mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0074] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0075] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0076] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0077] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that no inorganic salt containing lanthanide rare earth elements was used in the preparation of the composite negative ion powder.

[0078] A method for preparing wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the powder weight) to carry out surface coating modification in a high-speed mixer; then add 15g of clinoptilolite powder (200-mesh) and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0079] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0080] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0081] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0082] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that zeolite molecular sieves were not used in the preparation of the composite negative ion powder.

[0083] A method for preparing wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the powder weight) to carry out surface coating modification in a high-speed mixer; then add 20g of cerium nitrate and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0084] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0085] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0086] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0087] Comparative Example 7 The difference between Comparative Example 7 and Example 1 is that neither the texture layer nor the moisture-proof layer contained composite negative ion powder.

[0088] A method for preparing wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the powder weight) to carry out surface coating modification in a high-speed mixer; then add 20g of cerium nitrate and 15g of clinoptilolite powder (200-mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0089] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0090] Lamination: Decorative paper impregnated with polyurethane adhesive and transparent wear-resistant paper coated with UV-cured resin containing 2% nitrogen-doped titanium dioxide are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0091] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0092] Comparative Example 8 The difference between Comparative Example 8 and Example 1 is that nitrogen-doped titanium dioxide was not added to the photocatalytic layer.

[0093] A method for preparing a composite negative ion functional wood flooring includes the following steps: Preparation of composite negative ion powder: Take 50g of 500-mesh tourmaline powder and use KH-550 silane coupling agent (1.5% of the powder weight) to carry out surface coating modification in a high-speed mixer; then add 20g of cerium nitrate and 15g of clinoptilolite powder (200-mesh), and continue mixing for 30min until uniform to obtain composite negative ion powder.

[0094] Preparation of the load substrate layer: 80g of composite negative ion powder is mixed evenly with 1000g of dry wood fiber, and 200g of environmentally friendly isocyanate adhesive (MDI) is sprayed in. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 min to form a load substrate layer with a thickness of 8mm.

[0095] Lamination: Decorative paper impregnated with polyurethane adhesive containing 5% tourmaline powder and transparent wear-resistant paper coated with UV-cured resin are sequentially laid on top of the load substrate layer to form a texture layer and a photocatalytic layer, respectively; a balance paper containing 3% composite negative ion powder is laid below to form a moisture-proof layer; then it is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40s to obtain composite negative ion functional wood flooring.

[0096] Post-processing: After 7 days of curing, the composite negative ion functional wood flooring can be processed into click-lock flooring.

[0097] Comparative Example 9 Substrate preparation: 1000g of dried wood fiber is sprayed into 200g of urea-formaldehyde resin adhesive. After laying and pre-pressing, it is hot-pressed at 210℃ and 4MPa for 8 minutes to make a high-density fiberboard with a thickness of 8mm, which serves as the substrate layer of the flooring.

[0098] Lamination and post-treatment: Decorative paper impregnated with melamine resin and transparent abrasion-resistant paper coated with UV coating are laid sequentially on top of the substrate layer, and balancing paper impregnated with melamine resin is laid underneath. The mixture is fed into a continuous press and hot-pressed at 200℃ and 3.5MPa for 40 seconds. After curing for 7 days, it is processed into click-lock flooring.

[0099] Comparative Example 9 is a standard engineered wood flooring sold on the market.

[0100] The composite wood flooring in Examples 1-5 and Comparative Examples 1-9 was tested for its physical and chemical properties according to GB / T 18102-2020 "Impregnated Paper Laminate Wood Flooring", GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", and GB 18580-2025 "Formaldehyde Emission Limits in Wood-based Panels and Their Products for Interior Decoration and Renovation". The results are shown in Table 1. Table 1. Test results of the physical and chemical properties of composite wood flooring As can be seen from Table 1, the physical and chemical properties of the composite wood flooring in Examples 1-5 and Comparative Examples 1-8 of the present invention all meet the requirements of national standards, and the performance difference between them and the commercial composite wood flooring in Comparative Example 9 is not significant. The commercial composite wood flooring in Comparative Example 9 releases formaldehyde.

[0101] The negative ion function of the composite wood flooring in Examples 1-5 and Comparative Examples 1-9 was tested according to JC / T 2110-2012 "Indoor Air Ion Concentration Test Method". The results are shown in Table 2. Table 2. Test results of negative ion function of composite wood flooring Note: “——” in Table 2 indicates no negative ion release or no formaldehyde purification function.

[0102] According to the data from Example 1, Comparative Example 1, and Comparative Example 7, when the composite negative ion powder prepared in this invention is not used in the load substrate layer and the moisture-proof layer, the formaldehyde purification, negative ion release, and low-humidity stability of Comparative Example 1 are lower than those of Comparative Example 7, which only added composite negative ion powder to the load substrate layer, and are far lower than those of Example 1. The load substrate layer is the core negative ion release layer (second gradient layer) of the "three-layer gradient composite" structure of this invention, bearing the main and long-lasting negative ion release function. At the same time, the ternary synergistic system of rare earth-tourmaline-zeolite in the composite powder is the core support for high release efficiency and low-humidity stability. Comparative Example 1 lacks this core functional layer and can only rely on a small amount of tourmaline powder in the texture layer to release negative ions, which is extremely inefficient and lacks a synergistic system to ensure the ionization reaction in a low-humidity environment; the formaldehyde purification also relies solely on the photocatalytic layer, and the effect is greatly reduced. This effectively demonstrates that the addition of composite negative ion powder to the load substrate layer is the core foundation for achieving high-concentration, high-stability negative ion release and efficient formaldehyde purification.

[0103] According to the data from Example 1 and Comparative Example 2, silane coupling agent modification enables tourmaline powder to form chemical bonds with wood-based substrates and adhesives. This improves powder dispersibility, prevents agglomeration from obscuring active sites, and enhances bonding strength to prevent the loss of functional materials. Unmodified tourmaline powder is prone to agglomeration and deactivation during hot pressing, which also disrupts the synergistic interface of rare earth-tourmaline-zeolite, leading to a sharp drop in water molecule ionization efficiency under low humidity conditions. The reduced negative ion release further weakens the synergistic purification effect with the photocatalytic layer. Therefore, surface modification of tourmaline powder with silane coupling agent is a key step in ensuring the dispersibility and activity of the composite negative ion powder, directly affecting negative ion release efficiency, low humidity stability, and formaldehyde purification capacity.

[0104] Based on the data from Example 1 and Comparative Example 3, it is evident that inorganic salts of rare earth elements, acting as electronic additives, reduce the ionization energy of water molecules, which is crucial for low-humidity release. Zeolite molecular sieves adsorb and enrich water molecules, prevent powder agglomeration, and regulate the reaction microenvironment. Comparative Example 3, using only modified tourmaline powder, lacks the activating effect of rare earth elements and the adsorption and slow-release effect of zeolite. The release of negative ions relies solely on the polarization electric field of tourmaline itself, resulting in low efficiency and heavy dependence on ambient humidity. In dry environments, insufficient water molecules make it difficult to sustain the ionization reaction. Therefore, the synergistic addition of rare earth salts and zeolite molecular sieves is a necessary condition to overcome the performance bottleneck of single tourmaline powder and achieve high-concentration, stable negative ion release.

[0105] Based on the data from Example 1 and Comparative Example 4, it is evident that modified tourmaline powder is the core functional component of the composite negative ion powder, providing the essential polarized electric field and radiant energy necessary for negative ion generation. Comparative Example 4 completely lacks this core component; relying solely on rare earth element inorganic salts and zeolite, it cannot generate an effective polarized electric field and has almost no ability to autonomously release negative ions. Formaldehyde purification relies solely on the weak effect of the photocatalytic layer, resulting in extremely low efficiency. Therefore, modified tourmaline powder is an indispensable basic component of the composite negative ion powder; its absence will lead to the complete failure of the product's negative ion release function.

[0106] Based on the data from Example 1 and Comparative Example 5, it is evident that rare earth element inorganic salts, as highly efficient electronic additives, can receive and transfer energy to tourmaline, significantly reducing the activation energy required for water molecule ionization. This is the core solution to the "low humidity failure" problem of traditional negative ion flooring. Comparative Example 5 lacks the activating effect of rare earth salts; tourmaline can only ionize water molecules using its own energy, making the ionization reaction difficult to occur when the water molecule concentration is low in low humidity environments. Simultaneously, the overall negative ion release efficiency decreases, weakening the synergistic purification effect with the photocatalytic layer. Therefore, rare earth element inorganic salts are the core additives for achieving stable negative ion release in low humidity environments, directly determining the product's environmental adaptability.

[0107] Based on the data from Example 1 and Comparative Example 6, the porous framework structure of zeolite molecular sieves has a dual function: firstly, it adsorbs and enriches air and water molecules, continuously providing raw materials for the ionization reaction and achieving slow-release of negative ions; secondly, it acts as a carrier to disperse tourmaline and rare earth salts, preventing powder agglomeration and improving the utilization rate of active sites. Comparative Example 6 lacks zeolite molecular sieves, leading to powder agglomeration, a reduction in active sites, and insufficient ionization raw materials under dry conditions, resulting in a sharp drop in low-humidity release. Therefore, zeolite molecular sieves are an important component for achieving slow-release of negative ions and improving low-humidity stability; their absence disrupts the synergistic mechanism of the composite powder.

[0108] Based on the data from Example 1 and Comparative Example 8, it is evident that the nitrogen-doped titanium dioxide in the photocatalytic layer can not only directly decompose organic pollutants such as formaldehyde under visible light, but also provide additional activation energy for the negative ion release reaction, forming a dual synergistic purification mechanism of "catalytic decomposition-negative ion release". Comparative Example 8 lacks a photocatalytic material, thus failing to provide activation energy for negative ion release, leading to a decrease in release efficiency, and also losing the core pathway of formaldehyde decomposition, resulting in limited purification effect relying solely on negative ion sedimentation. Therefore, the nitrogen-doped titanium dioxide in the photocatalytic layer is the core of achieving the "release + decomposition" dual purification mechanism, while also enhancing the negative ion release efficiency.

[0109] As shown in Table 2, the composite wood flooring of Examples 1-5 of this invention exhibits an average negative ion release concentration exceeding 2000 ions / cm³ under standard environmental conditions. Even in a dry environment with a relative humidity of 30%, the release concentration remains above 1200 ions / cm³, demonstrating excellent low-humidity stability. The 24-hour formaldehyde purification efficiency (1m³ chamber, initial concentration 1.0±0.1mg / m³) reaches over 85%. In contrast, the composite wood flooring of Comparative Examples 1-8 has an average negative ion release concentration of 125-1704 ions / cm³. In a dry environment with a relative humidity of 30%, the negative ion release concentration is only 30-500 ions / cm³, and the 24-hour formaldehyde purification efficiency is significantly reduced (17-56%). Comparative Example 9, a commercial composite wood flooring, lacks both negative ion and formaldehyde purification functions. It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each range and any value between the two endpoints can be used. Since the steps and methods used are the same as in the examples, preferred embodiments are described to avoid redundancy. Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the inventive concept of the present invention, can make other changes and modifications to these embodiments, all of which fall within the scope of the present invention.

[0110] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. If such modifications and variations fall within the scope of equivalents of this invention, then this invention also intends to include these modifications and variations.

Claims

1. A composite negative ion functional wood flooring, characterized in that, From top to bottom, it includes a photocatalytic layer, a textured layer, a load substrate layer, and a moisture-proof layer; The photocatalytic layer comprises a blend of UV-curable resin and nano-photocatalytic material; The textured layer comprises a mixture of tourmaline powder and polyurethane adhesive; Both the load substrate layer and the moisture-proof layer include composite negative ion powder; The composite negative ion powder comprises the following raw material components by weight: 40 to 60 parts of tourmaline powder modified with silane coupling agent, 20 to 30 parts of inorganic salts of rare earth elements, and 10 to 20 parts of zeolite molecular sieve.

2. The composite negative ion functional wood flooring according to claim 1, characterized in that, Based on the mass of the load substrate layer, the proportion of composite negative ion powder in the load substrate layer is 6%-6.5%; And / or, based on the mass of the moisture-proof layer, the proportion of composite negative ion powder in the moisture-proof layer is 3%-5%; And / or, based on the mass of the texture layer, the polyurethane adhesive containing tourmaline powder accounts for 50%-60% of the texture layer, and the mass ratio of tourmaline powder to polyurethane adhesive is 1:

20.

3. The composite negative ion functional wood flooring according to claim 1, characterized in that, The nano-photocatalytic material includes nitrogen-doped titanium dioxide with a particle size of 10 nm to 30 nm; And / or, the silane coupling agent includes models KH-550 or KH-560; And / or, the inorganic salt of the rare earth element includes at least one of cerium nitrate, lanthanum chloride, and europium yttrium nitrate.

4. The composite negative ion functional wood flooring according to claim 3, characterized in that, The zeolite molecular sieve is clinoptilolite powder with a particle size of 200 mesh.

5. The composite negative ion functional wood flooring according to claim 1, characterized in that, The tourmaline powder has a particle size of 300 mesh to 1250 mesh.

6. A method for preparing the composite negative ion functional wood flooring according to any one of claims 1 to 5, characterized in that, Includes the following steps: The composite negative ion powder is mixed evenly with wood fiber and adhesive, and after being laid out, it is formed by a first hot pressing treatment to obtain the load substrate layer. A textured layer and a photocatalytic layer are laid sequentially on top of the load-bearing substrate layer, and a moisture-proof layer is laid below. After a second hot-pressing process, a composite negative ion functional wood flooring is obtained. The preparation method of the composite negative ion powder includes: Tourmaline powder was mixed with a silane coupling agent and modified to obtain modified tourmaline powder. Rare earth element inorganic salts and zeolite molecular sieves are added to modified tourmaline powder and mixed evenly to obtain composite negative ion powder.

7. The preparation method of the composite negative ion functional wood flooring according to claim 6, characterized in that, The mass ratio of the composite negative ion powder to wood fiber and adhesive is 8:100:(15-20). And / or, the mass ratio of the tourmaline powder to the silane coupling agent is 20:3; And / or, the mass ratio of the rare earth element inorganic salt, modified tourmaline powder and zeolite molecular sieve is 4:(8-10):(2-3).

8. The preparation method of the composite negative ion functional wood flooring according to claim 6, characterized in that, The first hot pressing treatment temperature is 190-230℃ and 4.5-6 MPa; And / or, the second hot pressing temperature is 180℃~220℃, the pressure is 3MPa~4MPa, and both the temperature and pressure of the second hot pressing are lower than the temperature of the first hot pressing.

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