CN107486921A - A kind of fiberboard with purifying formaldehyde function - Google Patents

Abstract

A fiberboard with the function of purifying formaldehyde, including wood fibers, adhesives and activated carbon. Activated carbon is used to absorb free formaldehyde in the air to its surface and pores, and nickel-palladium alloy and alumina are used to form alternating magnetic and electric fields to excite titanium dioxide. , degrade formaldehyde adsorbed on the surface of activated carbon and/or the surface and pores of activated carbon into water and carbon dioxide, achieve the purpose of purifying formaldehyde, overcome the problems of short validity period and possible secondary pollution of physical adsorption method, and solve the problem of photocatalyst needing light The problem that the condition does not play a role in the absence of light and the chemical method is limited by the concentration of formaldehyde.

Description

A fiberboard with the function of purifying formaldehyde

technical field

The invention belongs to the field of wood-based panels, and in particular relates to a fiberboard with the function of purifying formaldehyde.

Background technique

Fiberboard, also known as density board, is a wood-based panel made of wood fiber or other vegetable fiber and applied with urea-formaldehyde resin or other suitable adhesives. Fiberboard has the characteristics of wide source of raw materials, high production efficiency, stable material (uniform structure, moderate density, smooth and delicate board surface, easy to carry out various finishing treatments, and good dimensional stability), and is widely used in floors, furniture, doors, The material of choice for home improvement trim, siding, partitions and packaging. With the rapid development of my country's economy and the continuous improvement of urbanization rate, fiberboard products with stable quality, high environmental protection level, meeting differentiated needs, and safety and environmental protection functions have a broad market space.

Chinese patents (201510695858.9) and (2000910071340.2) respectively disclose the use of bamboo charcoal and activated carbon to purify formaldehyde in the air; Chinese patent (201410035319.8) discloses the use of titanium dioxide to purify formaldehyde in the air. To sum up, at present, some formaldehyde is usually added to fiberboard Eliminating agent, to achieve the purpose of removing formaldehyde, its main methods include: physical adsorption method, photocatalyst method and chemical method. The physical adsorption method is limited by the amount of adsorption, the validity period is short, and even secondary pollution occurs. The photocatalyst method is limited by the lack of light at night. When there is no light, the photocatalyst will not function. The chemical method refers to adding a substance that can react with formaldehyde in a solid-gas complex phase to the fiberboard, so that the fiberboard has the function of absorbing and decomposing formaldehyde. The addition amount and reactivity determine the efficiency and validity period of formaldehyde purification.

Contents of the invention

The technical problem to be solved by the present invention is to provide a fiberboard with the function of purifying formaldehyde. In order to achieve the above object, the present invention adopts the following technological solutions:

The invention provides a fiberboard with the function of purifying formaldehyde, comprising wood fiber, adhesive and activated carbon, wherein the fiberboard is evenly distributed with activated carbon of 5-10% of the weight of wood fiber; the surface of the activated carbon and/or the pores of the activated carbon A layer of film composed of nickel-palladium alloy, aluminum oxide and titanium dioxide is arranged on the surface, and the thickness of the film is 2-5 molecular layers.

A layer of nickel-palladium alloy and alumina is grafted on the surface of the activated carbon by electrophoresis, and its thickness is 1-2 molecular layers; a layer of titanium dioxide is grafted on the surface of the nickel-palladium alloy by electrophoresis, and its thickness is 1-4 molecular layer.

The activated carbon is coconut shell activated carbon, the particle size is 12-30 mesh, the specific surface area is 1050-1200 m ² /g, and the methylene blue adsorption value is 200-225 mg/g.

The grade of the nickel-palladium alloy is PdNi ₄₀ .

The alumina is composed of 40%-50% γ-Al₂O₃ and 50%-60% α-Al₂O₃.

The titanium dioxide is anatase titanium dioxide.

A fiberboard with the function of purifying formaldehyde in the present invention uses activated carbon to adsorb free formaldehyde in the air to its surface and pores, and utilizes nickel-palladium alloy and alumina to form alternating magnetic and electric fields to excite titanium dioxide to adsorb to the surface of activated carbon and / or formaldehyde degrades into water and carbon dioxide on the pore surface and pores of activated carbon, so as to achieve the purpose of purifying formaldehyde, overcome the problems of short validity period and possible secondary pollution of physical adsorption method, and solve the problem that photocatalyst needs light and does not work without light Problems and chemical methods are limited by the concentration of formaldehyde and other issues.

The present invention will be further described below in conjunction with specific examples, which are not intended to limit the present invention, and any equivalent replacements in the field performed according to the disclosure of the present invention shall fall within the scope of protection of the present invention.

Description of drawings

Figure 1 Schematic diagram of fiberboard with the function of purifying formaldehyde

Figure 2 Schematic diagram of activated carbon structure

In the figure: 1 is wood fiber, 2 is activated carbon, 3 is nickel-palladium alloy, 4 is alumina, and 5 is titanium dioxide.

detailed description

A fiberboard with the function of purifying formaldehyde, comprising wood fiber (1), an adhesive (not shown in the figure) and activated carbon (2), and coconut shell activated carbon (10% by weight of wood fiber) is evenly distributed in the fiberboard ( 2), the particle size is 12-30 mesh, the specific surface area is 1100 m ² /g, and the methylene blue adsorption value is 210 mg/g. A layer of nickel-palladium alloy (3) and oxidation The grade of aluminum (4), nickel-palladium alloy (3) is PdNi ₄₀ , and alumina (4) is composed of 40% γ-Al₂O₃ and 60% α-Al₂O₃; in nickel-palladium alloy (3) and alumina (4 ) is grafted with a layer of anatase titanium dioxide (5) by electrophoresis method, and its thickness is 3 molecular layers.

The mechanism of fiberboard degradation formaldehyde in the present invention: coconut shell activated carbon is a porous material, the specific surface area reaches 1100 ^m2 /g, and the methylene blue adsorption value is 210 mg/g, which can absorb the free formaldehyde released in the air or the fiberboard glue layer to its surface or In the gaps of different sizes, the titanium dioxide on the surface of the activated carbon or the surface of the pores is excited by the alternating magnetic field and electric field formed by the nickel-palladium alloy and alumina, and the formaldehyde adsorbed on the surface of the activated carbon and/or the surface and pores of the activated carbon will be degraded into water and carbon dioxide. , to achieve the purpose of purifying formaldehyde, because the nickel-palladium alloy and alumina can form an alternating magnetic field and electric field, which provides kinetic energy for the degradation of titanium dioxide, overcomes the problems of short validity period and possible secondary pollution of the simple activated carbon adsorption method, and solves the problem of titanium dioxide The problem that the conditions that need light do not play a role without light and the chemical method is limited by the concentration of formaldehyde.

Embodiment two:

A fiberboard with the function of purifying formaldehyde, including wood fiber (1), adhesive (not shown in the figure) and coconut shell activated carbon (2), the fiberboard is evenly distributed with 8% coconut shell activated carbon by weight of wood fiber ( 2), the particle size is 20 mesh, the specific surface area is 1200 m ² /g, and the methylene blue adsorption value is 225mg/g. There is a layer of nickel-palladium alloy (3) and alumina (4) on the surface of coconut shell activated carbon (2), the thickness of which is 3 molecular layers; there is a layer of sharp Titanium type titanium dioxide (5), the thickness of which is 2 molecular layers.

Claims (6)

1. A fiberboard with the function of purifying formaldehyde, comprising wood fiber, adhesive and activated carbon, is characterized in that: the activated carbon of wood fiber weight 5-10% is evenly distributed in the described fiberboard; the surface of the activated carbon and/or A thin film composed of nickel-palladium alloy, aluminum oxide and titanium dioxide is arranged on the surface of the pores of the active carbon, and the thickness of the thin film is 2-5 molecular layers. 2. according to the described fibreboard of claim 1 with the function of purifying formaldehyde, it is characterized in that: adopt electrophoresis method to be grafted with one deck nickel-palladium alloy and aluminum oxide on the surface of described gac, its thickness is 1-2 molecular layer; The surface of the palladium alloy is grafted with a layer of titanium dioxide by electrophoresis, and its thickness is 1-4 molecular layers. 3. The fiberboard with the function of purifying formaldehyde according to claim 2, characterized in that: the activated carbon is coconut shell activated carbon, the particle size is 12-30 mesh, the specific surface area is 1050-1200 m ² /g, and the methylene blue adsorption value It is 200-225mg/g. 4. The fiberboard with the function of purifying formaldehyde according to claim 3, characterized in that: the grade of the nickel-palladium alloy is PdNi ₄₀ . 5. The fiberboard with the function of purifying formaldehyde according to claim 4, wherein the alumina is composed of 40%-50% γ-Al₂O₃ and 50%-60% α-Al₂O₃. 6. The fiberboard with the function of purifying formaldehyde according to claim 5, characterized in that: the titanium dioxide is anatase titanium dioxide.