Antibacterial and mildew-proof structural slab for decoration bottoming and manufacturing method of antibacterial and mildew-proof structural slab

Abstract

The invention discloses an antibacterial and mildew-proof structural slab for decoration bottoming and a manufacturing method of the antibacterial and mildew-proof structural slab, and belongs to the technical field of artificial board manufacturing. In order to solve the problem that an existing bottom-hitting plate is prone to mildewing when being tightly attached to a cement wall, the method comprises the following steps that surface layer wood shavings and core layer wood shavings are manufactured; spraying an antifungal organic mixed solution to the surface layer wood shavings, and spraying antibacterial plant extract mixed oil to the core layer wood shavings; paving, applying glue, and carrying out hot press molding; the plate blank is subjected to high-temperature and high-humidity antibacterial fumigation treatment firstly, and plant extraction fumigation water containing antibacterial plant extraction mixed oil is used for fumigation; and finally, the surface of the plate is preheated and roller-coated with an anti-mildew organic mixed solution, and a finished product is obtained after drying and curing. The structural slab prepared by the method forms a three-dimensional antibacterial and mildew-proof barrier from inside to outside, has excellent comprehensive properties of long-acting mildew resistance, high antibacterial rate, mildew-proof grade of 0 grade or I grade, formaldehyde emission of HENF grade and nearly zero odor, and is particularly suitable for bottoming of wall surfaces or floors in whole decoration and customization.

Description

Technical Field

[0001] This invention belongs to the field of artificial board manufacturing technology, specifically an antibacterial and mildew-proof structural board for decorative base layering and its manufacturing method, which is suitable for use as a base layer for walls or floors in whole-house customized decoration. Background Technology

[0002] With the increasing popularity of whole-house customized home furnishing, the use of wood wall panels for decoration has become a mainstream choice in the mid-to-high-end market. In such applications, oriented strand board (OSB) is typically used as the base material for bonding directly to building walls (such as cement walls). However, cement walls are prone to condensation or high residual humidity under certain environmental conditions (such as during the rainy season or large temperature differences between indoors and outdoors), causing the base board in close contact with it to remain damp for extended periods. This damp environment easily breeds mold and bacteria, not only causing the board itself to mold and rot, affecting its structural stability and lifespan, but also leading to a deterioration in indoor air quality, posing potential health risks to end users. Frequent related complaints and repair disputes have become a major technical pain point plaguing the home furnishing industry.

[0003] To address the problem of mold growth in engineered wood products, various technologies have emerged to endow them with antibacterial and anti-mold properties. For example, some technologies add inorganic antibacterial agents (such as nano-silver and silver-loaded zirconium phosphate) or organic anti-mold agents (such as BIT and quaternary ammonium salts) to the adhesives; others use plant extracts (such as peppermint and isatis root extract) or natural bamboo vinegar for treatment; still others improve the inherent moisture resistance of the boards by optimizing the hot-pressing process or using specific wood raw materials (such as oak).

[0004] While these existing technologies have improved the antibacterial and anti-mildew properties of the boards to some extent, they still have significant limitations in solving the long-term mildew prevention problem in the extremely demanding application scenario of "closely adhering to a high-humidity cement wall": (1) Insufficient protection depth and durability: Most technologies only add antibacterial and antifungal ingredients to the adhesive or spray them on the surface. The effective ingredients are difficult to penetrate into the core layer of the board and are prone to migration or failure in a long-term humid environment, thus failing to form a three-dimensional protective barrier from the inside out. (2) Difficulty in achieving comprehensive performance: The introduction of some strong chemical mildew inhibitors may bring environmental problems, such as increased formaldehyde release or the generation of odors, making it difficult to simultaneously meet E NF Grade or HE NF Requirements for high environmental protection standards and excellent olfactory sensation; (3) Lack of process specificity and synergy: Existing processes mostly focus on improving a single link, lacking a synergistic protection design for the entire process of the board from the inside out, from production to post-processing. In particular, there is a lack of a dedicated post-processing procedure that can promote the deep penetration and firm adhesion of antibacterial components, resulting in a significant decrease in the protective effect in simulated long-term dampness tests on walls (for example, ordinary boards may show obvious mold growth after 6 months of simulated installation).

[0005] Therefore, the industry urgently needs to develop a new antibacterial and mildew-resistant structural board and its manufacturing method to provide a comprehensive protection solution that is deep, long-lasting, and environmentally friendly. This solution is specifically designed for situations where the prefabricated baseboard is in close contact with a damp base wall, fundamentally solving the problems of existing boards being prone to mold growth, having short-lasting antibacterial properties, and being unable to achieve both environmental protection and mildew prevention. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide an antibacterial and mildew-resistant structural board for decorative base coating and its manufacturing method. Through a specific combination of antibacterial and mildew-resistant agents and a fumigation-roller coating synergistic process, it solves the problems of easy mold growth and short-lasting antibacterial properties when existing base coatings are closely attached to cement walls, achieving deep and long-lasting protection while also considering E... NF It meets environmental protection standards and has excellent mechanical properties.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention first proposes a method for manufacturing an antibacterial and mildew-resistant structural board for decorative base layering, comprising the following steps: Step 1: Create large surface shavings and a core layer of shavings; Step 2: Spray the large surface shavings with an anti-mold organic mixture, and spray the core shavings with an antibacterial plant extract mixture. Step 3: Lay out three layers in sequence: large surface wood shavings, medium core wood shavings, and large surface wood shavings. Step 4: Apply adhesive to the shavings after they have been laid; Step 5: Hot-press the slab after applying adhesive. The hot-pressing temperature is 95-110℃, the pressure is 2.5-4.0MPa, and the hot-pressing time is 80-150 seconds. Step Six: Perform antibacterial fumigation treatment on the hot-pressed slab: First, perform high-temperature treatment at 95-125℃ for 35-60 minutes; then, under conditions of 55-75℃ and relative humidity of 75-95%, perform fumigation with plant extract fumigation water for 60-120 minutes. The plant extract fumigation water is composed of purified water and the antibacterial plant extract mixed oil. Step 7: Preheat the surface of the board after antibacterial fumigation treatment to 50-70℃, then roll-coat the anti-mildew organic mixture onto the upper and lower surfaces of the board and then dry it. Step 8: Curing the dried board material to obtain the antibacterial and mildew-proof structural board.

[0008] Furthermore, the antibacterial plant extract blend is prepared by mixing emulsified eucalyptus oil and purified water at a volume ratio of 3:7, and the eucalyptol content in the eucalyptus oil is not less than 70.0%. The antifungal organic mixture is prepared by mixing a mixture of four components—BIT, zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride—with purified water at a volume ratio of 5:5; the volume ratio of BIT, zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride is 1:1:1:1.

[0009] Furthermore, in step one, a disc chipper is used to plan large-diameter fresh logs in a straight line to obtain the large surface shavings and core shavings. The diameter of the logs is ≥25cm and the felling time does not exceed 30 days. The surface layer of large wood shavings has a length of 25-150mm, a width of 4-50mm, and a thickness of 0.2-0.5mm; the core layer of wood shavings has a length of 10-30mm, a width of 2-10mm, and a thickness of 0.2-0.5mm.

[0010] Furthermore, in step two, the dosage of the antifungal organic mixture sprayed on the surface large-scale wood shavings is: 8-10g of antifungal organic mixture sprayed per 100g of surface large-scale wood shavings; the dosage of the antibacterial plant extract mixed oil sprayed on the core layer wood shavings is: 8-10g of antibacterial plant extract mixed oil sprayed per 100g of core layer wood shavings.

[0011] Furthermore, in step four, the adhesive used for sizing is a water-based polymeric isocyanate adhesive; wherein: the amount of adhesive applied to the surface layer of large wood shavings is 9.5-10.5% of its weight, and the amount of adhesive applied to the core layer of wood shavings is 7.5-9.0% of its weight.

[0012] Furthermore, in step six, the conditions for high-temperature treatment are adjusted according to the thickness of the sheet material: in: This refers to the high-temperature processing temperature. This refers to the high-temperature processing time; The thickness of the sheet material; The fumigation conditions are adjusted according to the thickness of the board material: in: For fumigation humidity; This refers to the fumigation temperature; This refers to the thickness of the sheet material.

[0013] Furthermore, in step six, the plant-based fumigation water is prepared by mixing purified water and the antibacterial plant-based mixed oil in a volume ratio of 5:5.

[0014] Furthermore, in step seven, the coating amount of the antifungal organic mixture is 20-25 mg / m², which is then applied to the upper and lower surfaces of the board by roller coating, and subsequently dried at 90-115°C for 45-90 seconds.

[0015] Furthermore, in step eight, the dried board is cured for 7 days in an environment with a temperature of 15-35℃ and a humidity of 45-70% to obtain the antibacterial and mildew-proof structural board.

[0016] The present invention also proposes an antibacterial and mildew-resistant structural board for decoration base preparation, which is prepared by the method described above. The board is characterized by comprising two surface large-scale wood shaving layers and a core middle wood shaving layer located therebetween. The core middle wood shaving layer is impregnated with the antibacterial plant extract mixed oil, and the surface large-scale wood shaving layer is impregnated with the anti-mildew organic mixed liquid. The board as a whole undergoes the antibacterial fumigation treatment and surface roller coating treatment.

[0017] The beneficial effects of this invention are as follows: This invention relates to a method for manufacturing antibacterial and mildew-resistant structural boards for decorative and finishing applications. Through a collaborative process design, it achieves a unified approach to antibacterial and mildew-resistant performance, ensuring depth, durability, and environmental friendliness. First, step two involves differentiated spraying of specific antibacterial agents onto the surface and core layers of wood shavings. Step six involves antibacterial fumigation treatment (high-temperature treatment combined with plant-based fumigation water fumigation), and step seven involves surface roller coating. This constructs a multi-layered, three-dimensional protective system: core layer plant-based oil penetration – overall plant-based fumigation reinforcement – ​​surface organic liquid coating. This system utilizes high-temperature, high-humidity fumigation to promote deep penetration and effective fixation of effective components such as eucalyptus oil into the board. The surface roller coating then forms a dense anti-mildew layer, solving the problems of shallow protective layers and easy migration failure in existing technologies. This achieves a long-lasting mildew-resistant effect with no significant mold growth for up to nine months in a simulated humid wall environment. Second, step four uses a formaldehyde-free adhesive, and step five involves low-temperature, short-cycle hot pressing. This introduces highly effective antibacterial components while avoiding the generation of harmful substances, resulting in a final product with formaldehyde emissions meeting HE standards. NF It is of the highest quality and has an extremely low odor, combining high-efficiency mildew prevention with top-level environmental protection requirements.

[0018] In summary, the method of the present invention significantly improves the durability of the board material in extremely humid environments through the synergy of each step, while ensuring environmental friendliness, and comprehensively solves the industry pain points in the prior art. Attached Figure Description

[0019] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a flowchart illustrating the manufacturing method of the antibacterial and mildew-resistant structural board for decorative and finishing purposes according to the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0021] like Figure 1 As shown in the figure, the manufacturing method of the antibacterial and mildew-resistant structural board for decorative base layer in this embodiment includes the following steps.

[0022] Step 1: Create large surface shavings and medium core shavings.

[0023] (1) Wood shavings manufacturing This embodiment uses a disc planer with a straight-line planing method to produce large surface shavings and core shavings. For large-diameter (≥25cm) fresh logs (within 30 days of felling), the planer performs transverse planing with the blade line parallel to the wood fiber direction or at a certain angle, performing longitudinal-transverse planing. Because the cutting is done on a single plane, the shaving surface is flat, resulting in good shaving smoothness. This planing method does not involve feed movement of the blade and has the advantage of smooth material discharge, resulting in less damage to the shaving shape. This is beneficial for subsequent processes such as gluing, plant extract oil penetration, organic antifungal organic mixture penetration, and bonding.

[0024] In this embodiment, the length of the large surface wood shavings is 25-150mm, the width is 4-50mm, and the thickness is 0.2-0.5mm; the length of the wood shavings in the core layer is 10-30mm, the width is 2-10mm, and the thickness is 0.2-0.5mm.

[0025] (2) Drying wood shavings In this embodiment, a three-channel drum dryer is used to dry fresh wood shavings. The temperature inside the dryer is 360-445℃, the wind speed is 5m / s, and the moisture content of the wood shavings is dried to 6.5-10.5%. Then, impurities are sorted.

[0026] Step 2: Spray the large surface shavings with an anti-mold organic mixture, and spray the core shavings with an antibacterial plant extract mixture.

[0027] In this embodiment, the dosage of the antifungal organic mixture sprayed on the surface large-scale wood shavings is: 8-10g of antifungal organic mixture sprayed per 100g of surface large-scale wood shavings; the dosage of the antibacterial plant extract mixed oil sprayed on the core layer wood shavings is: 8-10g of antibacterial plant extract mixed oil sprayed per 100g of core layer wood shavings.

[0028] Specifically, the antibacterial plant extract blend is made by mixing emulsified eucalyptus oil with purified water. Specifically, the eucalyptus oil has a relative density of 0.895-0.920, a refractive index of 1.458-1.468, and contains no less than 70.0% eucalyptol (C10H18O), with heavy metals not exceeding 10 parts per million. The emulsified eucalyptus oil is mixed with industrial-grade purified water at a volume ratio of 3:7 to obtain the antibacterial plant extract blend. Specifically, the antibacterial plant extract blend has antibacterial, bacteriostatic, and insecticidal effects.

[0029] Specifically, the antifungal organic mixture is prepared by mixing an organic mixture of four components—BIT (benzisothiazolinone), zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride (quaternary ammonium salt)—with industrial-grade purified water at a volume ratio of 5:5. In this embodiment, the volume ratio of BIT, zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride is 1:1:1:1.

[0030] The organic antifungal mixture has the following effects: (1) it penetrates the mold cell membrane, binds to the sulfhydryl (-SH) enzyme in the cell, inhibits the activity of the enzyme, and blocks the energy metabolism and material synthesis of mold; (2) it interferes with the DNA replication and transcription process of mold, prevents the growth and reproduction of mold, and ultimately leads to the death of mold cells; (3) in particular, the quaternary ammonium salt molecules are positively charged and can be quickly adsorbed on the surface of the negatively charged mold cell membrane, changing the permeability of the cell membrane, leading to the leakage of core substances such as proteins and nucleic acids in the cell; (4) the quaternary ammonium salt that penetrates into the cell will further destroy the enzyme system and the synthesis of genetic material, block the energy metabolism and reproduction process of mold, and ultimately cause the death of mold cells.

[0031] Step 3: Perform a three-layer installation, sequentially laying a surface layer of large-scale wood shavings, a core layer of medium-sized wood shavings, and then another surface layer of large-scale wood shavings. In this embodiment, a ContiRoll continuous press from Siemens Compmtech is used to install the wood shavings in a three-layer structure: a surface layer of large-scale wood shavings, a core layer of medium-sized wood shavings, and another surface layer of large-scale wood shavings.

[0032] Step 4: Apply adhesive to the shavings after they have been laid.

[0033] In this embodiment, the adhesive used for application is a water-based polymeric isocyanate adhesive (API). Specifically, water-based polymeric isocyanate adhesives (API), also commonly referred to as water-based ethylene polyurethane adhesives, are representative composite adhesives. They are composed primarily of water-based polymers (usually polyvinyl alcohol PVA), corn starch, carboxymethyl cellulose, and water-based emulsions (polyvinyl acetate, polyacrylate, styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene copolymer, etc.), as well as fillers (usually calcium carbonate powder), surfactants, dispersants, etc., with polyisocyanates as crosslinking agents. They are formaldehyde-free, have good water resistance, good aging resistance, and offer short hot-pressing times and high efficiency.

[0034] In this embodiment, the amount of adhesive applied to the surface layer of large pieces of wood shavings is 9.5-10.5% of its weight, and the amount of adhesive applied to the core layer of wood shavings is 7.5-9.0% of its weight.

[0035] Step 5: Hot press the slab after applying adhesive.

[0036] In this embodiment, the thickness of the finished antibacterial and mildew-proof structural board is 9-18mm. The hot pressing is carried out with a preheating temperature of 50-65℃, a hot pressing temperature of 95-110℃, a pressure of 2.5-4.00MPa, and a hot pressing time of 80-150 seconds.

[0037] Step Six: Perform antibacterial fumigation treatment on the hot-pressed slab: After trimming the edges of the hot-pressed slab as required (generally 4×8 feet), first treat it at 95-125℃ for 35-60 minutes; then fumigate it for 60-120 minutes using plant-based fumigation water at 55-75℃ and relative humidity of 75-95%. The plant-based fumigation water is a mixture of purified water and the antibacterial plant-based oil mixture. In this embodiment, the plant-based fumigation water is a mixture of purified water and the antibacterial plant-based oil mixture at a volume ratio of 5:5.

[0038] In this embodiment, the high-temperature treatment conditions are adjusted according to the thickness of the sheet material, as follows: in: This refers to the high-temperature processing temperature. This refers to the high-temperature processing time; This refers to the thickness of the sheet material.

[0039] In this embodiment, the fumigation conditions are adjusted according to the thickness of the board material, as follows: in: For fumigation humidity; This refers to the fumigation temperature; This refers to the thickness of the sheet material.

[0040] Step 7: Preheat the surface of the board after antibacterial fumigation treatment to 50-70℃, then roll-coat the anti-mildew organic mixture onto the upper and lower surfaces of the board and then dry it.

[0041] In this embodiment, the coating amount of the antifungal organic mixture is 20-25 mg / ㎡ on the upper and lower surfaces of the board, and then dried at 90-115℃ for 45-90 seconds.

[0042] Step 8: Curing the dried board material to obtain the antibacterial and mildew-proof structural board.

[0043] In this embodiment, the dried boards are neatly stacked and cured for 7 days in an environment with a temperature of 15-35℃ and a humidity of 45-70% to obtain the antibacterial and mildew-proof structural board, which is then ready for use.

[0044] This embodiment also proposes an antibacterial and mildew-resistant structural board for decorative base layering, which is manufactured using the above-described method for producing the antibacterial and mildew-resistant structural board for decorative base layering. Specifically, the antibacterial and mildew-resistant structural board for decorative base layering in this embodiment includes two surface large-sheet wood shavings layers and a core layer with wood shavings in between. The core layer with wood shavings is impregnated with the antibacterial plant extract mixed oil, and the surface large-sheet wood shavings layer is impregnated with the anti-mildew organic mixed liquid. The entire board undergoes the antibacterial fumigation treatment and surface roller coating treatment.

[0045] Example 1: Manufacturing of an antibacterial and mildew-resistant structural board for interior decoration.

[0046] This embodiment prepares an antibacterial and mildew-resistant structural board (mildew-resistant oriented strand board) with a thickness of 12mm. The specific steps are as follows: Step 1: Preparation and pretreatment of wood shavings.

[0047] Raw material selection: Fresh pine logs with a diameter of about 30cm are selected within 20 days after being felled.

[0048] Wood shavings manufacturing: A disc planer is used to plan in a straight line with the blade line parallel to the direction of the wood fibers, producing wood shavings of two specifications.

[0049] Large shavings on the surface: approximately 50mm in length, 12mm in width, and 0.35mm in thickness.

[0050] The wood shavings in the core layer are approximately 20mm in length, 6mm in width, and 0.35mm in thickness.

[0051] Wood shavings drying: The fresh wood shavings are fed into a three-channel drum dryer and dried at approximately 400°C and a wind speed of 5 m / s to reduce the final moisture content of the wood shavings to approximately 8.5%. Subsequently, they are sorted to remove impurities.

[0052] Step 2: Spray antibacterial and antifungal agent.

[0053] Antibacterial agent preparation: Antibacterial plant extract blended oil: Emulsify eucalyptus oil that meets the standard (eucalyptol content ≥70%), mix it with industrial grade pure water at a volume ratio of 3:7, and stir well for later use.

[0054] Antifungal organic mixture: The four components BIT, zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride (quaternary ammonium salt) are premixed and then mixed with industrial-grade pure water at a volume ratio of 5:5 and stirred evenly for later use.

[0055] Spraying treatment: On the paving line, spray the core layer of wood shavings with an antibacterial plant extract mixture, and spray the surface layer of large pieces of wood shavings with an antifungal organic mixture. The spraying amount is calculated based on the oven-dry weight of the wood shavings, with 9g of the corresponding mixture sprayed for every 100g of wood shavings.

[0056] Step 3: Laying.

[0057] A continuous press laying line was used, and three layers of directional paving were carried out in the following order: "large surface wood shavings (longitudinal) - core layer wood shavings (transverse) - large surface wood shavings (longitudinal)". During the paving process, a small amount of the aforementioned antibacterial plant extract mixture was sprayed onto the surface of each layer of wood shavings.

[0058] Step 4: Apply adhesive.

[0059] Water-based polymeric isocyanate adhesive (API adhesive) is used for application.

[0060] For large pieces of wood shavings on the surface, apply adhesive at a rate of 10% of the oven-dry weight of the wood shavings.

[0061] For the wood shavings in the core layer, the amount of adhesive applied is 8.3% of the oven-dry weight of the wood shavings.

[0062] Step 5: Hot pressing.

[0063] The laid slab is fed into a hot press. First, it is preheated at 60°C, and then hot-pressed at 105°C and 3.2MPa for 110 seconds to obtain a slab with a thickness of 12mm.

[0064] Step Six: Antibacterial Fumigation Treatment.

[0065] After the hot-pressed slab is trimmed, it is sent into a special treatment chamber for composite fumigation treatment: High temperature treatment: Depending on the thickness of the board (12mm), treat at 105℃ for 42 minutes.

[0066] Plant-based fumigation: Subsequently, the treatment chamber was adjusted to fumigation mode. Fumigation conditions were: temperature 62℃, relative humidity 83%, and internal airflow velocity 8m / s. The "plant-based fumigation water" used for fumigation was freshly prepared from purified water and the aforementioned antibacterial plant-based mixed oil at a volume ratio of 5:5. Fumigation lasted for 90 minutes.

[0067] After fumigation, the slabs are stacked and cured at room temperature for 24 hours.

[0068] Step 7: Surface roller coating penetration treatment.

[0069] Preheating and roller coating: The fumigated and cured board is preheated to 60°C through a hot air channel, and then the anti-mildew organic mixture is uniformly roller coated on its upper and lower surfaces through a precision roller coating machine. The coating amount is controlled at 22 mg / ㎡.

[0070] Drying: Immediately after roller coating, the product enters the infrared drying channel and is dried at 100°C for 70 seconds.

[0071] Step 8: Health Preservation and Finished Product

[0072] The dried boards are transferred to a constant temperature and humidity curing room and stacked for 7 days in an environment of 25℃ and 60% humidity. After curing, they are inspected, graded, and packaged to obtain the finished antibacterial and mildew-resistant structural board.

[0073] Example 2: Adjustment of process parameters for plates of different thicknesses This example illustrates how to adjust key process parameters based on the target sheet thickness.

[0074] When producing 9mm thick sheets: High temperature treatment: 98℃ for 38 minutes.

[0075] Fumigation treatment: Fumigation humidity 78%, temperature 58℃, fumigation time 70 minutes.

[0076] When producing 18mm thick sheets: High temperature treatment: 115℃ for 52 minutes.

[0077] Fumigation treatment: Fumigation humidity 92%, temperature 70℃, fumigation time 110 minutes.

[0078] The remaining steps, such as the preparation and spraying ratio of antibacterial agent, the amount of adhesive applied, the hot pressing temperature and pressure range, the amount of roller coating and curing conditions, are the same as in Example 1, with only minor optimizations made within the parameter range based on actual conditions.

[0079] Effect verification: The results of comparing the sheet material obtained in Example 1 with the sheet material obtained by existing methods are shown in Table 1.

[0080] Table 1. Comparison of the sheet material prepared in Example 1 with that prepared by existing methods. In this embodiment, the board material produced using a "dual protection" method of fumigation plant extract fumigation water + roller-coated penetrating organic anti-mold mixture has the following advantages compared to boards produced by existing methods, after testing according to national and industry standards: (1) Environmental performance: Formaldehyde emission level meets HE standards. NF Grade (≤0.025 mg / m³) 3 The odor rating is Level 1 (near-zero odor). (2) Antibacterial and antifungal properties: According to the JC / T 2039-2010 standard test, the antibacterial rate is ≥99% and the antifungal grade is 0 (no growth was observed by the naked eye). (3) Environmental durability: In a constant humidity chamber with a temperature of 28℃ and a relative humidity of 90%, the board was placed in close contact with a cement board with a moisture content of about 60% for a simulated test. After 9 months, only about 3% of the board surface showed slight mold growth, which was far better than ordinary treated boards (the area of ​​obvious mold growth was >95% during the same period). (4) Physical and mechanical properties: The static bending strength, internal bond strength, and 24-hour water absorption thickness expansion rate all meet or exceed the requirements for high-quality oriented strand board in GB / T 4897.

[0081] The above embodiments demonstrate that the present invention, through a comprehensive process of "differentiated layering of antibacterial agents, hot pressing, high-temperature plant extract fumigation post-treatment, and surface roller coating reinforcement," successfully manufactures a special baseboard material that combines deep and long-lasting antibacterial and mildew-proof properties, top-level environmental protection, and excellent mechanical properties.

[0082] The embodiments described above are merely preferred embodiments for fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A method for manufacturing an antibacterial and mildew-resistant structural board for decorative base layering, characterized in that: Includes the following steps: Step 1: Create large surface shavings and a core layer of shavings; Step 2: Spray the large surface shavings with an anti-mold organic mixture, and spray the core shavings with an antibacterial plant extract mixture. Step 3: Lay out three layers in sequence: large surface wood shavings, medium core wood shavings, and large surface wood shavings. Step 4: Apply adhesive to the shavings after they have been laid; Step 5: Hot-press the slab after applying adhesive. The hot-pressing temperature is 95-110℃, the pressure is 2.5-4.0MPa, and the hot-pressing time is 80-150 seconds. Step Six: Perform antibacterial fumigation treatment on the hot-pressed slab: first, perform high-temperature treatment at 95-125℃ for 35-60 minutes; Then, under conditions of 55-75℃ and relative humidity of 75-95%, the plant extract fumigation water is used for fumigation for 60-120 minutes. The plant extract fumigation water is composed of purified water and the antibacterial plant extract mixed oil. Step 7: Preheat the surface of the board after antibacterial fumigation treatment to 50-70℃, then roll-coat the anti-mildew organic mixture onto the upper and lower surfaces of the board and then dry it. Step 8: Curing the dried board material to obtain the antibacterial and mildew-resistant structural board.

2. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: The antibacterial plant extract blend is prepared by mixing emulsified eucalyptus oil and purified water at a volume ratio of 3:7, wherein the eucalyptol content in the eucalyptus oil is not less than 70.0%. The antifungal organic mixture is prepared by mixing a mixture of four components—BIT, zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride—with purified water at a volume ratio of 5:5; the volume ratio of BIT, zinc pyridine sulfate, dodecyl alcohol ester, and polyhexamethylene biguanide hydrochloride is 1:1:1:

1.

3. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step one, a disc chipper is used to plan large-diameter fresh logs in a straight line to obtain the large surface shavings and core shavings. The diameter of the logs is ≥25cm and the felling time does not exceed 30 days. The surface layer of large wood shavings has a length of 25-150mm, a width of 4-50mm, and a thickness of 0.2-0.5mm; the core layer of wood shavings has a length of 10-30mm, a width of 2-10mm, and a thickness of 0.2-0.5mm.

4. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step two, the dosage of the antifungal organic mixture sprayed on the surface large wood shavings is: 8-10g of antifungal organic mixture sprayed per 100g of surface large wood shavings; the dosage of the antibacterial plant extract mixed oil sprayed on the core wood shavings is: 8-10g of antibacterial plant extract mixed oil sprayed per 100g of core wood shavings.

5. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step four, the adhesive used for sizing is a water-based polymeric isocyanate adhesive; wherein: the amount of adhesive applied to the surface layer of large wood shavings is 9.5-10.5% of its weight, and the amount of adhesive applied to the core layer of wood shavings is 7.5-9.0% of its weight.

6. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step six, the high-temperature treatment conditions are adjusted according to the thickness of the board material: in: This refers to the high-temperature processing temperature. This refers to the high-temperature processing time; The thickness of the sheet material; The fumigation conditions are adjusted according to the thickness of the board material: in: For fumigation humidity; This refers to the fumigation temperature; This refers to the thickness of the sheet material.

7. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step six, the plant-based fumigation water is prepared by mixing purified water and the antibacterial plant-based mixed oil in a volume ratio of 5:

5.

8. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step seven, the coating amount of the antifungal organic mixture is 20-25 mg / ㎡ on the upper and lower surfaces of the board, and then dried at 90-115℃ for 45-90 seconds.

9. The method for manufacturing the antibacterial and mildew-resistant structural board for decorative base layering according to claim 1, characterized in that: In step eight, the dried board is cured for 7 days in an environment with a temperature of 15-35℃ and a humidity of 45-70% to obtain the antibacterial and mildew-proof structural board.

10. An antibacterial and mildew-resistant structural board for decorative priming, prepared by the method described in any one of claims 1-10, characterized in that: It includes two surface layers of large-scale wood shavings and a core layer of wood shavings in between. The core layer of wood shavings is impregnated with the antibacterial plant extract mixed oil, and the surface layers of large-scale wood shavings are impregnated with the antifungal organic mixed liquid. The entire board is treated with antibacterial fumigation and surface roller coating.

Images