Floor capable of efficiently and stably releasing negative ions and preparation method thereof

Abstract

The invention belongs to the technical field of decorative materials, and relates to a floor capable of efficiently and stably releasing negative ions, which comprises a high-density fiberboard base material, a negative ion impregnated bond paper layer arranged on the upper surface of the base material, and a balance layer arranged on the lower surface of the base material, the negative ion impregnated bond paper layer contains a negative ion additive, and the negative ion additive contains tourmaline and terbium oxide. The invention further discloses a preparation method of the floor. By optimizing the mixing and coating process of the negative ion additive and the dipping glue, a uniform negative ion coating with a micropore slow release function is formed on the surface of the floor, high-concentration negative ions are continuously released in a normal state, the actually measured release concentration can reach 5000 / cm < 3 >, and the indoor air quality is remarkably improved; the surface of the floor is subjected to mortar enhancement treatment, the wear resistance is excellent, and functionality reduction caused by daily wear is avoided; negative ion release is stable, the service life is long, air can be continuously purified, and human health is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of decorative materials technology, and relates to flooring, and more particularly to a flooring that efficiently and stably releases negative ions and its preparation method. Background Technology

[0002] In recent years, with the significant increase in demand for healthy living environments, the functional building materials sector has experienced rapid development. Traditional wood composite flooring mainly focuses on basic properties such as wear resistance, water resistance, and decorative appeal, making it difficult to actively improve indoor air quality. Research shows that negative ions (O2)... - or OH - It has the function of purifying the air. According to the QX / T 380-2017 standard "Air Negative (Oxygen) Ion Concentration Levels", the concentration of negative ions in the air, N (ions / cm³), is defined as follows: 3 The air quality is classified into four levels: Level I (fresh air, N≥1200), Level II (relatively fresh air, 500≤N<1200), Level III (fair air, 100≤N<500), and Level IV (not very fresh air, 0<N<100). When the concentration of negative oxygen ions (N) in the air reaches 1200 or higher, it can effectively neutralize positively charged suspended particulate matter (such as PM2.5 dust) and inhibit the reproduction of some bacteria.

[0003] Currently, there are various types of negative ion flooring on the market, but they generally do not generate enough negative ions, making it difficult to effectively increase the concentration of negative ions in the air and failing to meet the Class I (fresh air, N≥1200) environmental requirements. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a floor that releases negative ions efficiently and stably and a method for preparing the same.

[0005] Technical solution

[0006] A flooring that efficiently and stably releases negative ions includes a high-density fiberboard substrate, a negative ion impregnated paper layer disposed on the upper surface of the substrate, and a balancing layer disposed on the lower surface of the substrate; the negative ion impregnated paper layer contains a negative ion additive, which includes tourmaline and terbium oxide.

[0007] The functions and parameters of each layer are designed as follows:

[0008] High-density fiberboard substrate: Selected with a density of 800-1200 kg / m³ 3 With a thickness of 5 to 18 mm, this range of parameters ensures that the substrate has sufficient mechanical strength (static bending strength ≥ 50 MPa, internal bond strength ≥ 1.5 MPa) and resistance to shrinkage and swelling (dimensional stability ≤ 0.5), making it suitable for the load-bearing needs of different scenarios such as home and commercial use.

[0009] Negative ion impregnated adhesive film paper layer: This is the core functional layer of the flooring, consisting of decorative base paper and impregnating adhesive, wherein the impregnating adhesive contains a negative ion additive; wherein the negative ion additive is a composite powder of tourmaline and terbium oxide, which can continuously ionize water molecules to generate stable negative ions; the adhesive film paper undergoes two impregnation and drying processes, forming a uniform "decorative-wear-resistant-negative ion release" integrated coating on the surface.

[0010] Balancing layer: using sizing film paper after impregnation (base paper weight 40-100 g / m²) 2 Adhesive application rate: 120-180 g / m 2 Its main function is to counteract the internal stress generated during the hot pressing of the negative ion impregnated adhesive film paper layer and the substrate, while blocking the penetration of ground moisture into the substrate, preventing the substrate from becoming damp and deformed, and ensuring the overall structural stability of the floor.

[0011] In a preferred embodiment of the present invention, the terbium oxide in the negative ion additive has a mass ratio of 1% to 10% and the tourmaline has a mass ratio of 90% to 99%; preferably, the terbium oxide has a mass ratio of 5% and the tourmaline has a mass ratio of 95%.

[0012] Furthermore, the terbium oxide is a mixture of terbium trioxide (Tb₂O₃) and terbium heptaoxide (Tb₄O₇); even further, the mass ratio of terbium trioxide (Tb₂O₃) to terbium heptaoxide (Tb₄O₇) is 3:1 to 1:3, preferably 1:1.

[0013] In a preferred embodiment of the present invention, the negative ion additive accounts for 5% to 15% of the mass of the impregnation adhesive in the negative ion impregnation paper film layer, preferably 10%.

[0014] The formulation design of the negative ion additive is as follows:

[0015] Composition and proportion: It contains tourmaline and terbium oxide, wherein the mass proportion of terbium oxide is 1% to 10% and the mass proportion of tourmaline is 90% to 99%; preferably, the mass proportion of terbium oxide is 5% and the mass proportion of tourmaline is 95%. At this ratio, the permanent spontaneous electrode characteristics of tourmaline and the catalytic activity of terbium oxide can achieve synergistic effect, which can ensure the negative ion generation efficiency and avoid the cost increase caused by excessive addition of terbium oxide.

[0016] Terbium oxide fine formulation: The terbium oxide is a mixture of terbium trioxide (Tb2O3) and terbium tetraoxide (Tb4O7) in a mass ratio of 3:1 to 1:3, preferably 1:1; terbium trioxide has excellent electron transfer activity, which can improve the ionization efficiency of water molecules, while terbium tetraoxide has a stable crystal lattice structure, which can enhance the dispersibility of additives in adhesives. The mixture of the two can achieve both "high efficiency generation" and "stable dispersion".

[0017] Dosage control: The negative ion additive accounts for 5% to 15% of the mass of the impregnation adhesive in the negative ion impregnation film paper layer, preferably 10%; if the dosage is less than 5%, the negative ion concentration is insufficient (<3000 ions / cm³). 3 When the viscosity of the adhesive exceeds 15%, the viscosity of the adhesive increases abnormally, which can easily lead to uneven impregnation and affect the flatness of the adhesive film paper.

[0018] A second objective of this invention is to disclose a method for preparing the floor that efficiently and stably releases negative ions.

[0019] A method for preparing a floor that efficiently and stably releases negative ions includes the following steps:

[0020] S1. Preparation of negative ion impregnated paper: Provide decorative base paper, and perform a first impregnation, spraying with adhesive sand, a first drying, a second impregnation, and a second drying process; wherein, the adhesive used in the second impregnation contains a negative ion additive.

[0021] S2. Assembly and hot pressing: The obtained negative ion impregnated adhesive film paper is laid on the upper surface of the high-density fiberboard substrate, and a balancing adhesive film paper is laid on the lower surface of the substrate, and then hot pressing is performed.

[0022] S3. Post-processing: After the hot-pressed sheet is cured, it is then cut and milled.

[0023] In a preferred embodiment of the present invention, in step S1, the adhesive used for the first impregnation is a low-formaldehyde urea-formaldehyde resin solution, and the amount of adhesive applied is 40% to 60% of the weight of the decorative base paper.

[0024] In a preferred embodiment of the present invention, in step S1, the mortar comprises low-formaldehyde urea-formaldehyde resin and corundum, wherein the amount of corundum added is 80% to 120% of the mass of urea-formaldehyde resin; and the amount of mortar sprayed is 40% to 60% of the basis weight of the decorative base paper.

[0025] In a preferred embodiment of the present invention, in step S1, the adhesive used for the second impregnation is melamine-modified formaldehyde resin solution.

[0026] In a preferred embodiment of the present invention, the hot pressing process conditions in step S2 are: temperature 170-210°C, time 20-40s, and pressure 2-5MPa.

[0027] The process details and design rationale for each step in the preparation method disclosed in this invention are as follows:

[0028] First impregnation:

[0029] Adhesive selection: Low formaldehyde urea-formaldehyde resin (formaldehyde release ≤0.1g / kg) is used, and water (to adjust viscosity), penetrant (to improve the wettability of the adhesive to the base paper) and curing agent (to control curing speed) are added and mixed together;

[0030] Glue application amount control: 40% to 60% of the weight of the decorative base paper, preferably 50%; if the glue application amount is too low, the base paper will not be fully wetted, and the subsequent sprayed glue will easily fall off; if the glue application amount is too high, the glue will accumulate and wrinkles will easily appear after drying.

[0031] Process operation: Excess glue and air in the paper are squeezed out by the glue extrusion roller. The amount of glue applied is precisely controlled by adjusting the gap of the glue extrusion roller (0.1~0.3mm).

[0032] Spraying mortar:

[0033] The mortar formulation comprises low-formaldehyde urea-formaldehyde resin (binder) and corundum (mainly Al2O3, which improves wear resistance). The amount of corundum added is 80% to 120% of the mass of the urea-formaldehyde resin, preferably 100%.

[0034] Spraying amount control: 40% to 60% of the weight of the decorative base paper, preferably 50%. This spraying amount can make the floor surface abrasion resistance reach more than 6500 revolutions, meeting the "Household Class I" abrasion resistance requirements in GB / T 18102-2020.

[0035] Functional purpose: To form a uniform wear-resistant particle layer on the surface of the adhesive film paper, so as to avoid damage to the negative ion release layer by daily wear and tear.

[0036] First drying:

[0037] Equipment and parameters: A 4-6 section drying oven (5 sections preferred) is used; the oven temperature is 115-135℃; and the air velocity is 900-1100 m / s. 3 / min, paper feed speed 20~25m / min;

[0038] Control objectives: Remove moisture from the adhesive (moisture content of the adhesive film paper ≤8% after drying), while avoiding excessively high temperatures that could cause carbonization of the base paper or premature curing of the adhesive, thus reserving space for the second impregnation.

[0039] Second impregnation:

[0040] Adhesive selection: Melamine-modified formaldehyde resin adhesive (high hardness and good resistance to moisture and heat after curing), mixed with water, release agent (to prevent sticking to the board during hot pressing), leveling agent (to ensure the flatness of the adhesive film), and curing agent;

[0041] Mixing of negative ion additives: Add the pretreated negative ion additives (particle size ≤10μm, ensure uniform dispersion) to the above adhesive, stir at a speed of 1500~2000r / min, and stir for 30~40min;

[0042] Coating amount control: The coating amount on both the upper and lower surfaces of the film paper is 40% to 60% of the basis weight of the original paper, preferably 50%, to ensure that the negative ion additives are evenly distributed in the film paper and avoid performance fluctuations caused by excessively high local concentrations.

[0043] Second drying:

[0044] Equipment and parameters: A 4-6 section drying oven (5 sections preferred) is used; the oven temperature is 110-140℃; and the air velocity is 800-1000 m / s. 3 / min, paper feed speed 20~25m / min;

[0045] Control objective: To achieve a curing degree of 60% to 70% (semi-cured state) for the adhesive film, ensuring fluidity during subsequent hot pressing and preventing adhesion of the adhesive film during cutting and stacking;

[0046] Subsequent processing: Cut the dried adhesive film paper to the required specifications, and then stack and pack it.

[0047] S2, Billet Assembly and Hot Pressing

[0048] Assembly method: The negative ion impregnated film paper made of S1 is laid on the upper surface of the high-density fiberboard substrate (decorative side facing out), and the balancing film paper is laid on the lower surface (impregnated side facing the substrate), forming a three-layer structure of "balancing layer - substrate - negative ion impregnated film paper layer"; when assembling, it is necessary to ensure that each layer is aligned with a deviation of ≤1mm to avoid edge misalignment after hot pressing.

[0049] Hot pressing process:

[0050] Process parameters: temperature 170~210℃, time 20~40s, pressure 2~5MPa; preferred parameters are temperature 190℃, time 30s, and pressure 3.5MPa.

[0051] Parameter setting principle:

[0052] Temperature 170~210℃: Matches the curing characteristics of melamine-modified formaldehyde resin (rapid curing above 170℃, avoiding excessive cross-linking and brittleness of the resin below 210℃).

[0053] Time 20-40s: Ensure the resin is fully cured (curing degree ≥90%), while matching the production line efficiency to avoid excessive time leading to reduced capacity;

[0054] Pressure 2-5MPa: Ensure tight bonding between layers (interlayer bonding strength ≥1.0MPa), and avoid excessive pressure that could lead to excessive substrate compression (≤5%), affecting thickness accuracy.

[0055] S3, Post-processing

[0056] Curing treatment: Place the hot-pressed boards in an environment with room temperature (20-25℃) and relative humidity (45%-65%) for 2-8 days, preferably 5 days; the purpose is to balance the internal moisture content of the flooring (to stabilize the moisture content at 6%-12%), release the internal stress generated during the hot pressing process, and reduce the risk of warping and deformation during subsequent cutting and use.

[0057] Slitting and milling: Slitting and milling are performed according to the required specifications to ensure tight splicing during floor installation.

[0058] The negative ion additive used in this invention is mainly composed of tourmaline, a natural polar mineral with permanent self-generated electrodes. It can form a micron-sized spherical electrostatic field with positive and negative electrodes on the floor surface, making it an excellent negative ion catalyst. When water molecules in the air enter the electric field, they immediately undergo permanent ionization, and H2O decomposes into OH-. - and H + This process generates a large number of free electrons. As these free electrons move towards the positive electrode, they attach to oxygen molecules with higher electron affinity, forming superoxide anions, i.e., O2. - Simultaneously, the OH- ions released during ionization may attach to water molecules to form hydrated hydroxyl ions, a more stable form of negative ion, namely H3O2. - Two types of negative ions, O2 - and H3O2 - These substances can effectively adsorb harmful substances such as positively charged or electrically neutral dust, bacteria, and allergens in the air, thereby improving air quality. Both types of negative ions are stable and highly active, and can persist in the air for extended periods.

[0059] The air purification mechanism of the negative ion additive used in this invention mainly includes the following aspects:

[0060] Electrostatic adsorption: The released negative ions (O2) - H3O2 - The negatively charged particles attract positively charged suspended particulate matter in the air (such as dust, PM2.5, pollen, bacteria, etc.), neutralizing the charge and causing these particles to aggregate into larger particles and settle, thereby reducing the amount of inhalable particulate matter in the air.

[0061] Bacterial inhibition and decomposition: Negative ions can destroy the cell membranes or bioactive structures of microorganisms such as bacteria and mold, inhibiting their reproduction; at the same time, when in contact with volatile organic compounds (VOCs) such as formaldehyde and benzene, they can promote their decomposition and transformation into harmless substances.

[0062] Sustained-release performance: By combining tourmaline with terbium oxide, the unique catalytic activity and stable crystal structure of terbium are utilized to further enhance the generation efficiency and release stability of negative ions, avoiding functional attenuation due to changes in environmental humidity or surface wear, thereby achieving long-lasting air purification.

[0063] Beneficial effects

[0064] This invention optimizes the mixing and coating process of negative ion additives and impregnating adhesives to form a uniform negative ion coating with microporous slow-release function on the floor surface, achieving continuous release of high concentrations of negative ions under normal conditions, with a measured release concentration of up to 5000 ions / cm³. 3 It significantly improves indoor air quality; the floor surface is reinforced with mortar, resulting in excellent wear resistance and preventing functional degradation due to daily wear; the release of negative ions is stable, with a long service life, continuously purifying the air and benefiting human health. Detailed Implementation

[0065] The present invention will be described in detail below with reference to the embodiments, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0066] The preparation method described in this invention is detailed below.

[0067] A method for preparing a floor that efficiently and stably releases negative ions includes the following steps:

[0068] A. Preparation of negative ion impregnated adhesive film paper:

[0069] a) The base paper for impregnated paper is first impregnated in an impregnation tank. Excess glue and air in the paper are squeezed out by the extrusion roller. The amount of glue applied is adjusted by controlling the gap of the extrusion roller.

[0070] b) Spray a certain amount of adhesive sand to improve the wear resistance and scratch resistance of the impregnated paper;

[0071] c) The first drying process involves passing through several drying ovens;

[0072] d) A second impregnation is performed in the coating area, and the upper and lower surfaces are coated with impregnation glue mixed with negative ion additives;

[0073] e) The product undergoes a second drying process using several drying ovens;

[0074] f) Cutting, stacking, and packaging;

[0075] In step a), the base paper of the impregnated film paper has a basis weight of 50~100g / m². 2 Decorative paper, preferably 75g / m 2 The adhesive is a self-made low-formaldehyde urea-formaldehyde resin, and an impregnation solution is prepared by adding water, penetrant, and curing agent to the resin; the amount of adhesive applied is 40-60% of the basis weight of the original paper, preferably 50%;

[0076] In step b), the mortar is a mixture of self-made low-formaldehyde urea-formaldehyde resin, corundum (i.e., aluminum oxide), curing agent, penetrant, etc., wherein the amount of corundum added is 80-120% of the urea-formaldehyde resin, preferably 100%; the amount of mortar sprayed is 40-60% of the basis weight of the base paper, preferably 50%.

[0077] In step c), the oven has 4 to 6 sections, preferably 5 sections; the oven temperature is 115 to 135°C, and the air velocity is 900 to 1100 m / s. 3 / min, paper feed speed 20~25m / min;

[0078] In step d), the negative ion additive is a mixed powder of tourmaline and terbium oxide, wherein the terbium oxide accounts for 1-10%, preferably 5%, and the tourmaline accounts for 90-99%, preferably 95%. The terbium oxide is a mixture of terbium trioxide and terbium heptaoxide in a mass ratio of 3:1 to 1:3, preferably 1:1. The impregnation adhesive is a melamine-modified formaldehyde resin, with water, release agent, leveling agent, curing agent, etc. added to the resin. The amount of negative ion additive used is 5-15% of the weight of the impregnation adhesive, preferably 10%. The coating amount on the film paper is 40-60% of the basis weight of the base paper, and the coating amount on the bottom paper is 40-60% of the basis weight of the base paper, preferably both 50%.

[0079] In step e), the oven has 4 to 6 sections, preferably 5 sections; the oven temperature is 110 to 140°C, and the air velocity is 800 to 1000 m / s. 3 / min, paper feed speed 20~25m / min;

[0080] B. Hot pressing of negative ion floor blanks: High-density fiberboard is used as the base material, the upper surface is covered with negative ion impregnated adhesive paper, the lower surface is covered with balancing adhesive paper, and hot pressing is performed.

[0081] The high-density fiberboard has a density of 800~1200 kg / m³. 3 Thickness 5~18mm, preferred density 900kg / m³ 3 The thickness is 12mm; the balancing adhesive film paper is made by impregnating balancing base paper with adhesive, and the basis weight of the balancing base paper is 40-100g / m³. 2 70g / m 2The amount of adhesive on the balanced adhesive film paper is 120-180 g / m². 2 Preferred 150g / m 2 The hot pressing temperature is 170~210℃, the time is 20~40s, and the pressure is 2~5MPa, preferably 190℃, 30s, and 3.5MPa.

[0082] C. Cutting and milling of negative ion flooring: It needs to be cured before it can be cut and milled according to the required specifications.

[0083] The conditioning process involves placing the floor at room temperature for 2 to 8 days, preferably 5 days. This process aims to balance the internal moisture content of the floor, release internal stress, and reduce problems such as warping and deformation.

[0084] Example 1

[0085] A flooring that efficiently and stably releases negative oxygen ions, the preparation method of which includes the following steps:

[0086] (1) The impregnated film paper base paper is impregnated for the first time in an impregnation tank, and the basis weight of the impregnated film paper base paper is 70 g / m². 2 The decorative paper is coated with adhesive, and excess glue and air are squeezed out of the paper using an extrusion roller. The adhesive is a self-made low-formaldehyde urea-formaldehyde resin with a small amount of penetrant and curing agent added. The amount of adhesive applied is 50% of the basis weight of the original paper, i.e., 35 g / m². 2 ;

[0087] (2) Spraying mortar, wherein the spraying amount is 35g / m 2 The mortar is a 1:1 mixture of self-made low-formaldehyde urea-formaldehyde resin and corundum, with a small amount of penetrant and curing agent added.

[0088] (3) The first drying process is carried out in 5 drying ovens at a temperature of 120℃ and a wind speed of 900 m / s. 3 / min, paper feed speed 20m / min;

[0089] (4) A second impregnation is performed in the coating area, and an impregnation adhesive mixed with negative ion additives is applied to the upper and lower surfaces. The negative ion additives are a mixture of tourmaline and terbium oxide at a mass ratio of 95:5, and the terbium oxides are a mixture of terbium trioxide and terbium heptaoxide at a mass ratio of 1:1. The impregnation adhesive is a melamine-modified formaldehyde resin, with a small amount of water, release agent, leveling agent, curing agent, etc. added to the resin. The amount of negative ion additives used is 10% of the mass of the impregnation adhesive. The coating amount of the film paper on both the upper and lower surfaces is 50% of the basis weight of the original paper, i.e., 35 g / m². 2 ;

[0090] (5) The product undergoes a second drying process in five drying ovens at a temperature of 130°C and an air velocity of 1000 m / s.3 / min, paper feed speed 20m / min;

[0091] (6) Cutting, stacking, and packaging;

[0092] (7) Select a density of 900 kg / m³ 3 The substrate is made of 12mm thick high-density fiberboard, with negative ion impregnated paper on the upper surface and 50g / m² base paper on the lower surface. 2 Adhesive application rate: 150g / m 2 The paper is impregnated with a balanced adhesive film and then hot-pressed at a temperature of 190°C, a time of 30 seconds, and a pressure of 3.5 MPa.

[0093] (8) After a 5-day curing period, the negative ion flooring is cut and milled.

[0094] The negative ion flooring prepared in this embodiment has the following performance indicators after testing, as shown in Table 1.

[0095] Table 1

[0096]

[0097] Example 2

[0098] A flooring that efficiently and stably releases negative oxygen ions, the preparation method of which includes the following steps:

[0099] (1) The impregnated film paper base paper is impregnated for the first time in an impregnation tank, and the basis weight of the impregnated film paper base paper is 80 g / m². 2 The decorative paper is coated with adhesive, and excess glue and air are squeezed out of the paper using an extrusion roller. The adhesive is a self-made low-formaldehyde urea-formaldehyde resin with a small amount of penetrant and curing agent added. The amount of adhesive applied is 40% of the basis weight of the original paper, i.e., 32 g / m². 2 ;

[0100] (2) Spraying mortar, wherein the spraying amount is 40g / m 2 The mortar is a mixture of self-made low-formaldehyde urea-formaldehyde resin and corundum in a 1:0.8 ratio, with the addition of a small amount of penetrant and curing agent;

[0101] (3) The first drying process is carried out in 5 drying ovens at a temperature of 130℃ and a wind speed of 1000m. 3 / min, paper feed speed 25m / min;

[0102] (4) A second impregnation is performed in the coating area, and an impregnation adhesive mixed with negative ion additives is applied to the upper and lower surfaces. The negative ion additives are a mixture of tourmaline and terbium oxide at a mass ratio of 98:2, and the terbium oxides are a mixture of terbium trioxide and terbium heptoxide at a mass ratio of 1:2. The impregnation adhesive is a melamine-modified formaldehyde resin, with a small amount of water, release agent, leveling agent, curing agent, etc. added to the resin. The amount of negative ion additives used is 5% of the mass of the impregnation adhesive. The coating amount of the film paper on both the upper and lower surfaces is 50% of the basis weight of the original paper, i.e., 40 g / m². 2 ;

[0103] (5) The product undergoes a second drying process in five drying ovens at a temperature of 140℃ and an air velocity of 900 m / s. 3 / min, paper feed speed 25m / min;

[0104] (6) Cutting, stacking, and packaging;

[0105] (7) Select a density of 850 kg / m³ 3 The substrate is made of 8mm thick high-density fiberboard, with negative ion impregnated paper on the upper surface and 60g / m² base paper on the lower surface. 2 Adhesive application rate: 160g / m 2 The paper is impregnated with a balanced adhesive film and then hot-pressed. The hot-pressing temperature is 200°C, the time is 35s, and the pressure is 4.0MPa.

[0106] (8) After a 3-day curing period, the negative ion flooring is cut and milled.

[0107] The negative ion flooring prepared in this embodiment has the following performance indicators after testing, as shown in Table 2.

[0108] Table 2

[0109]

[0110] Example 3

[0111] A flooring that efficiently and stably releases negative oxygen ions, the preparation method of which includes the following steps:

[0112] (1) The impregnated film paper base paper is impregnated for the first time in an impregnation tank, and the basis weight of the impregnated film paper base paper is 100 g / m². 2 The decorative paper is coated with adhesive, and excess glue and air are squeezed out of the paper using an extrusion roller. The adhesive is a self-made low-formaldehyde urea-formaldehyde resin with a small amount of penetrant and curing agent added. The amount of adhesive applied is 60% of the basis weight of the original paper, i.e., 60 g / m². 2 ;

[0113] (2) Spraying mortar, wherein the spraying amount is 60g / m 2The mortar is a mixture of self-made low-formaldehyde urea-formaldehyde resin and corundum in a 1:1.2 ratio, with a small amount of penetrant and curing agent added.

[0114] (3) The first drying process is carried out in 5 drying ovens at a temperature of 135℃ and a wind speed of 1100 m / s. 3 / min, paper feed speed 22m / min;

[0115] (4) A second impregnation is performed in the coating area, and an impregnation adhesive mixed with negative ion additives is applied to the upper and lower surfaces. The negative ion additives are a mixture of tourmaline and terbium oxide at a mass ratio of 90:10, and the terbium oxides are a mixture of terbium trioxide and terbium heptaoxide at a mass ratio of 2:1. The impregnation adhesive is a melamine-modified formaldehyde resin, with a small amount of water, release agent, leveling agent, curing agent, etc. added to the resin. The amount of negative ion additives used is 15% of the mass of the impregnation adhesive. The coating amount of the film paper on both the upper and lower surfaces is 60% of the basis weight of the original paper, i.e., 60 g / m². 2 ;

[0116] (5) The product undergoes a second drying process in a 5-section drying oven at a temperature of 140℃ and a wind speed of 1000 m / s. 3 / min, paper feed speed 22m / min;

[0117] (6) Cutting, stacking, and packaging;

[0118] (7) Select a density of 950 kg / m³ 3 The substrate is made of 15mm thick high-density fiberboard, with negative ion impregnated paper on the upper surface and 90g / m² base paper on the lower surface. 2 Adhesive application amount: 170g / m 2 The balanced impregnated paper is then hot-pressed at a temperature of 210°C for 40 seconds and a pressure of 5 MPa.

[0119] (8) After a 6-day curing period, the negative ion flooring is cut and milled.

[0120] The negative ion flooring prepared in this embodiment has the following performance indicators after testing, as shown in Table 3.

[0121] Table 3

[0122]

[0123] The embodiments described above are merely specific implementations of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A flooring that efficiently and stably releases negative ions, characterized in that: It includes a high-density fiberboard substrate, a negative ion impregnated paper layer disposed on the upper surface of the substrate, and a balancing layer disposed on the lower surface of the substrate; the negative ion impregnated paper layer contains negative ion additives, and the negative ion additives contain tourmaline and terbium oxide.

2. The flooring with efficient and stable negative ion release according to claim 1, characterized in that: In the negative ion additive, the mass percentage of terbium oxide is 1% to 10%, and the mass percentage of tourmaline is 90% to 99%; preferably, the mass percentage of terbium oxide is 5%, and the mass percentage of tourmaline is 95%.

3. The flooring with efficient and stable negative ion release according to claim 2, characterized in that: The terbium oxide is a mixture of terbium trioxide (Tb₂O₃) and terbium tetraoxide (Tb₄O₇).

4. The flooring with efficient and stable negative ion release according to claim 3, characterized in that: The mass ratio of terbium trioxide (Tb₂O₃) to terbium tetraoxide (Tb₄O₇) is 3:1 to 1:3, preferably 1:

1.

5. The flooring with efficient and stable negative ion release according to claim 1, characterized in that: The negative ion additive accounts for 5% to 15% of the mass of the impregnation adhesive in the negative ion impregnation paper film layer, preferably 10%.

6. A method for preparing a floor that efficiently and stably releases negative ions as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Preparation of negative ion impregnated paper: Provide decorative base paper, and perform a first impregnation, spraying with adhesive sand, a first drying, a second impregnation, and a second drying process; wherein, the adhesive used in the second impregnation contains a negative ion additive. S2. Assembly and hot pressing: The obtained negative ion impregnated adhesive film paper is laid on the upper surface of the high-density fiberboard substrate, and a balancing adhesive film paper is laid on the lower surface of the substrate, and then hot pressing is performed. S3. Post-processing: After the hot-pressed sheet is cured, it is then cut and milled.

7. The method for preparing the flooring that efficiently and stably releases negative ions according to claim 6, characterized in that: In step S1, the adhesive used for the first impregnation is a low-formaldehyde urea-formaldehyde resin solution, and the amount of adhesive applied is 40% to 60% of the weight of the decorative base paper.

8. The method for preparing the flooring that efficiently and stably releases negative ions according to claim 6, characterized in that: In step S1, the mortar comprises low-formaldehyde urea-formaldehyde resin and corundum, wherein the amount of corundum added is 80% to 120% of the mass of urea-formaldehyde resin; and the amount of mortar sprayed is 40% to 60% of the basis weight of the decorative base paper.

9. The method for preparing the flooring that efficiently and stably releases negative ions according to claim 6, characterized in that: In step S1, the adhesive used for the second impregnation is melamine-modified formaldehyde resin solution.

10. The method for preparing a floor that efficiently and stably releases negative ions according to claim 6, characterized in that, In step S2, the hot pressing process conditions are: temperature 170-210℃, time 20-40s, and pressure 2-5MPa.

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