CN110355855B - Shaving board capable of efficiently adsorbing formaldehyde and preparation process thereof - Google Patents

Shaving board capable of efficiently adsorbing formaldehyde and preparation process thereof Download PDF

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CN110355855B
CN110355855B CN201910467200.0A CN201910467200A CN110355855B CN 110355855 B CN110355855 B CN 110355855B CN 201910467200 A CN201910467200 A CN 201910467200A CN 110355855 B CN110355855 B CN 110355855B
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formaldehyde
chitosan
activated carbon
wood shavings
particle board
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CN110355855A (en
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沈亚伦
方旭峥
徐俊
毕海明
刘昊
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Treezo New Meterial Science and Technology Group Co Ltd
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Treezo New Meterial Science and Technology Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0209—Methods, e.g. characterised by the composition of the agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J189/00—Adhesives based on proteins; Adhesives based on derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2257/00—Components to be removed
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
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Abstract

The invention discloses a shaving board capable of efficiently adsorbing formaldehyde and a preparation process thereof. The shaving board capable of efficiently adsorbing formaldehyde comprises wood shavings, an adhesive and a formaldehyde purification material, wherein the formaldehyde purification material is chitosan loaded activated carbon or chitosan loaded charcoal. The invention adopts chitosan loaded activated carbon or chitosan loaded charcoal as a formaldehyde purification material capable of adsorbing formaldehyde for a long time in a particle board, wherein free formaldehyde in the air of the activated carbon is adsorbed to the surface and the pores of the particle board, and the amino group of the chitosan loaded on the activated carbon reacts with the formaldehyde to generate nontoxic oxime, and finally water and carbon dioxide are generated to realize the long-term purification of the formaldehyde. The chitosan used in the formaldehyde purification material is low in cost, and the manufacturing cost of the shaving board is greatly reduced on the basis of ensuring that the shaving board has high formaldehyde adsorption performance (the formaldehyde purification efficiency reaches 85%).

Description

Shaving board capable of efficiently adsorbing formaldehyde and preparation process thereof
Technical Field
The invention belongs to the technical field of activated carbon plates, and particularly relates to a shaving board capable of efficiently adsorbing formaldehyde and a preparation process thereof.
Background
With the rapid development of society, people have higher and higher requirements on environmental protection consciousness and physical and psychological health, and have stronger and stronger call for green environment-friendly artificial boards. The traditional shaving board is prepared by taking wood shavings as a raw material and urea-formaldehyde resin or phenolic resin as an adhesive through glue applying, stirring, paving and hot pressing, and has the problems of large glue consumption, over-standard formaldehyde content, unstable physical and chemical properties, poor waterproof and moisture-proof properties and the like.
In order to reduce the formaldehyde emission of shaving board, chinese utility model patent with application number CN201620426355.1 discloses a wooden composite shaving board of modified environmental protection, this shaving board is including the upper epidermis, intermediate level and the lower top layer that bond in proper order, wherein, upper epidermis and lower top layer be the environmental protection shaving board that adds the active carbon granule formation in wooden wood shavings, and the intermediate level for add the enhancement shaving board that ceramic granule formed in wooden shavings. The particle board adopts activated carbon particles to adsorb formaldehyde, and adopts ceramic particles to ensure the structural strength of the particle board.
However, the pure activated carbon has a limited formaldehyde adsorption amount and cannot purify the household environment for a long time; and the added activated carbon particles have poor compatibility with the adhesive, resulting in poor strength of the upper surface layer and the lower surface layer.
Chinese patent application publication No. CN 107486920A discloses a particle board with formaldehyde purification function, which comprises wood shavings, an adhesive and formaldehyde purification material, wherein the formaldehyde purification material accounting for 5-10% of the weight of the wood shavings is uniformly distributed in the particle board; the formaldehyde purifying material consists of 10-15% of nickel palladium alloy, 20-30% of alumina, 10-15% of titanium dioxide and 40-60% of activated carbon in percentage by mass.
The particle board utilizes formaldehyde purification materials to purify formaldehyde in the environment. The formaldehyde purification material utilizes the activated carbon to adsorb free formaldehyde in the air to the surface and the pores of the activated carbon, and then utilizes the nickel palladium alloy and the aluminum oxide to form alternating magnetic field and electric field to excite the titanium dioxide, so that the formaldehyde adsorbed to the surface and the pores of the activated carbon is degraded into water and carbon dioxide, and the purpose of purifying the formaldehyde is achieved.
However, a large proportion of nickel palladium alloy is used in the formaldehyde purification material for the particle board, with the nickel palladium alloy being relatively high in price, which greatly increases the manufacturing cost of the particle board; meanwhile, when the formaldehyde purification material is manufactured, the nickel palladium alloy, the aluminum oxide and the titanium dioxide need to be grafted to the surface or the pores of the activated carbon by an electrophoresis method, the preparation method is complex and tedious, relatively large-scale electrophoresis equipment needs to be used, and the cost of the formaldehyde purification material is further increased.
Disclosure of Invention
The invention aims to provide a shaving board which is low in cost, convenient to manufacture and capable of efficiently adsorbing formaldehyde and a preparation process thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a shaving board capable of efficiently adsorbing formaldehyde comprises wood shavings, an adhesive and a formaldehyde purification material, wherein the formaldehyde purification material is chitosan supported activated carbon or chitosan supported charcoal.
The invention adopts chitosan loaded activated carbon or chitosan loaded charcoal as a formaldehyde purification material capable of adsorbing formaldehyde for a long time in a particle board, wherein free formaldehyde in the air of the activated carbon is adsorbed to the surface and the pores of the particle board, and the amino group of the chitosan loaded on the activated carbon reacts with the formaldehyde to generate nontoxic oxime, and finally water and carbon dioxide are generated to realize the long-term purification of the formaldehyde. The chitosan used in the formaldehyde purification material is low in cost, and the manufacturing cost of the shaving board is greatly reduced on the basis of ensuring that the shaving board has high formaldehyde adsorption performance (the formaldehyde purification efficiency reaches 85%).
The shaving board capable of efficiently adsorbing formaldehyde is of a three-layer structure and comprises a core layer and surface layers positioned on two sides of the core layer, and the formaldehyde purification material is positioned in the surface layers. The formaldehyde purification material is arranged in the surface layer, can adsorb and purify free formaldehyde in the air, and can be added or not added in the core layer.
The compatibility of the chitosan-loaded activated carbon or chitosan-loaded charcoal and the adhesive is poor, and the mechanical strength of the adhesive is influenced by the addition of excessive chitosan-loaded activated carbon or chitosan-loaded charcoal, so that the composition of the adhesive is improved.
In the shaving board capable of efficiently adsorbing formaldehyde, the adhesive comprises soybean gum and a graft polymer of chitosan and an MDI curing agent in the surface layer. The soybean glue is an aldehyde-free adhesive, does not release free formaldehyde, and can reduce the release amount of the free formaldehyde of the shaving board; and the-NCO group of the MDI curing agent can react with the amino group on the chitosan, and the formed graft polymer can improve the strength of the adhesive.
In the shaving board capable of efficiently adsorbing formaldehyde, the adhesive comprises the following raw materials in parts by weight: 100 parts of soybean glue modified liquid (namely soybean protein modified glue), 12-18 parts of soybean flour, 2-5 parts of viscosity modifier, 1-3 parts of chitosan and 2-4 parts of MDI curing agent. Compared with chitosan loaded on activated carbon, the chitosan added in the adhesive raw material can completely expose molecular chains of the chitosan, amino groups on the molecular chains can quickly rob MDI to react with MDI, and the influence on formaldehyde purification efficiency caused by the reaction of MDI and the chitosan loaded on the activated carbon is avoided.
In the shaving board for efficiently adsorbing formaldehyde, the surface layer contains formaldehyde purification materials accounting for 1.2-1.5% of the weight of the wood shavings and adhesives accounting for 8.5-10% of the weight of the wood shavings. The formaldehyde purification material is less in addition proportion, and the influence of chitosan loaded activated carbon or chitosan loaded charcoal on the mechanical strength of the adhesive is further reduced on the basis of ensuring high formaldehyde purification efficiency.
In the shaving board capable of efficiently adsorbing formaldehyde, the adhesive is MDI adhesive in the core layer. The MDI glue is used as an ecological glue, does not contain formaldehyde, does not release free formaldehyde, and is beneficial to home health; meanwhile, MDI has the elasticity of rubber, the strength of plastics and excellent processability, so that the particle board has excellent static bending strength and elastic modulus.
In the shaving board capable of efficiently adsorbing formaldehyde, the core layer contains MDI glue which accounts for 7-10% of the weight of the wood shavings. In the invention, the surface layer glue application amount is only 8.5-10% of the weight of the wood shavings, and the core layer glue application amount is only 7-10% of the weight of the wood shavings, so that the lower glue application amount ensures that the content of the wood shavings in the shaving board is larger and the shaving board has better texture on the basis of ensuring the strength of the shaving board.
The preparation process of the shaving board capable of efficiently adsorbing formaldehyde comprises the following steps:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
(2) adding the chitosan supported activated carbon or chitosan supported charcoal into the soybean gum modifying liquid according to a preset mass percentage, adjusting the pH to 5-6, adding soybean flour, a viscosity regulator and chitosan, uniformly stirring, and standing to fully swell the soybean gum to obtain a compound soybean gum;
the viscosity regulator can be flour;
(3) uniformly stirring the compound soybean gum and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) according to a preset mass percentage, and adding an MDI curing agent while stirring to obtain surface layer slurry;
(4) uniformly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) according to a preset mass percentage to obtain a core layer slurry;
(5) and paving the surface layer slurry, the core layer slurry and the surface layer slurry in sequence, and performing hot press molding to obtain the shaving board capable of efficiently adsorbing formaldehyde.
In the step (1) of the process for preparing the shaving board capable of efficiently adsorbing formaldehyde, the method for preparing the chitosan-supported activated carbon or the chitosan-supported charcoal comprises the following steps:
(1.1) dissolving 8-12 parts of chitosan in 100 parts of acetic acid with the concentration of 0.5%, adding 22-28 parts of activated carbon or charcoal, and stirring for at least 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500 parts of 50% sodium carbonate solution, stirring for at least 3h, and standing for layering;
(1.3) taking the precipitate, washing the precipitate to be neutral by deionized water, and then placing the precipitate in a drying oven at 60 ℃ for drying for at least 48h to obtain the chitosan supported activated carbon or chitosan supported charcoal.
The invention also provides a veneer chipboard which sequentially comprises a chipboard, an adhesive layer and a veneer layer from the center of a board to the surface of the board, wherein the chipboard is the chipboard capable of efficiently adsorbing formaldehyde.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts chitosan loaded activated carbon or chitosan loaded charcoal as a formaldehyde purification material capable of adsorbing formaldehyde for a long time in a shaving board, wherein free formaldehyde in the air of the activated carbon is adsorbed to the surface and in pores of the activated carbon, and amino groups of the chitosan loaded on the activated carbon react with the formaldehyde to generate nontoxic oxime, and finally water and carbon dioxide are generated to realize long-term purification of the formaldehyde;
(2) the chitosan used in the formaldehyde purification material is low in cost, large-scale electrophoresis equipment is not needed in the preparation process, and the manufacturing cost of the shaving board is greatly reduced on the basis of ensuring that the shaving board has high-efficiency formaldehyde adsorption performance;
(3) the particle board disclosed by the invention not only has high-efficiency formaldehyde adsorption and purification performance, but also has excellent mechanical strength, wherein the static bending strength reaches 14.96MPa, the elastic modulus reaches 2246MPa, the formaldehyde purification efficiency reaches 85%, and the formaldehyde purification effect durability reaches 82.1%.
Detailed Description
The technical means of the present invention will be described in further detail below with reference to specific embodiments.
Example 1
The preparation process of the shaving board capable of efficiently adsorbing formaldehyde comprises the following steps:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
the method specifically comprises the following steps:
(1.1) dissolving 10g of chitosan in 100mL of 0.5% acetic acid, adding 25g of 60-mesh active carbon into the chitosan solution after complete dissolution, and magnetically stirring for 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500mL of 50% sodium carbonate solution, stirring for 3h, and standing for layering;
(1.3) taking the layered precipitate, washing the precipitate with deionized water to be neutral, and then placing the precipitate in a vacuum drying oven at 60 ℃ for drying for 48 hours to obtain chitosan supported activated carbon;
(2) adding the chitosan-loaded activated carbon prepared in the step (1) into 100g of soybean modified liquid, adjusting the pH to 5-6 by using a pH regulator, adding 15g of soybean flour, 3g of flour and 2g of chitosan, uniformly stirring, standing for 20min, and fully swelling soybean gum to obtain compound soybean gum;
(3) rapidly stirring the compounded soybean gum prepared in the step (2) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, and rapidly dropwise adding an MDI curing agent (the total dropwise adding amount is 3g) in the stirring process, wherein the adding amount of the compounded soybean gum accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the addition amount of MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the exhaust is finished, the shaving board capable of efficiently adsorbing formaldehyde in the embodiment is obtained.
Example 2
The preparation process of the shaving board capable of efficiently adsorbing formaldehyde comprises the following steps:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
the method specifically comprises the following steps:
(1.1) dissolving 8g of chitosan in 100mL of 0.5% acetic acid, adding 22g of 60-mesh active carbon into the chitosan solution after the chitosan is completely dissolved, and magnetically stirring for 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500mL of 50% sodium carbonate solution, stirring for 3h, and standing for layering;
(1.3) taking the layered precipitate, washing the precipitate with deionized water to be neutral, and then placing the precipitate in a vacuum drying oven at 60 ℃ for drying for 48 hours to obtain chitosan supported activated carbon;
(2) adding the chitosan-loaded activated carbon prepared in the step (1) into 100g of soybean modified liquid, adjusting the pH to 5-6 by using a pH regulator, adding 12g of soybean flour, 2g of flour and 1g of chitosan, uniformly stirring, standing for 20min, and fully swelling soybean gum to obtain compound soybean gum;
(3) rapidly stirring the compound soybean gum prepared in the step (2) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, and rapidly dropwise adding MDI curing agent (the total dropwise adding amount is 3g) in the stirring process, wherein the addition amount of the compound soybean gum accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the addition amount of MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the exhaust is finished, the shaving board capable of efficiently adsorbing formaldehyde in the embodiment is obtained.
Example 3
The preparation process of the shaving board capable of efficiently adsorbing formaldehyde comprises the following steps:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
the method specifically comprises the following steps:
(1.1) dissolving 12g of chitosan in 100mL of 0.5% acetic acid, adding 28g of 80-mesh charcoal into the chitosan solution after complete dissolution, and magnetically stirring for 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500mL of 50% sodium carbonate solution, stirring for 3h, and standing for layering;
(1.3) taking the layered precipitate, washing the precipitate with deionized water to be neutral, and then placing the precipitate in a vacuum drying oven at 60 ℃ for drying for 48 hours to obtain chitosan supported charcoal;
(2) adding the chitosan-loaded charcoal prepared in the step (1) into 100g of soybean modified liquid, adjusting the pH to 5-6 by using a pH regulator, adding 18g of bean flour, 5g of flour and 3g of chitosan, uniformly stirring, standing for 20min, and fully swelling soybean glue to obtain compound soybean glue;
(3) rapidly stirring the compound soybean gum prepared in the step (2) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, and rapidly dropwise adding MDI curing agent (the total dropwise adding amount is 3g) in the stirring process, wherein the addition amount of the compound soybean gum accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the addition amount of MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the exhaust is finished, the shaving board capable of efficiently adsorbing formaldehyde in the embodiment is obtained.
Comparative example 1
The preparation process of the shaving board comprises the following steps:
(1) taking 100g of soybean modified liquid, adding 20g of activated carbon into the soybean modified liquid, then using a pH regulator to regulate the pH to 5-6, adding 12g of soybean flour, 2g of flour and 1g of chitosan, uniformly stirring, standing for 20min, and obtaining the compound soybean gum after the soybean gum is fully swelled;
(2) rapidly stirring the compound soybean gum prepared in the step (1) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, and rapidly dropwise adding MDI curing agent (the total dropwise adding amount is 3g) in the stirring process, wherein the addition amount of the compound soybean gum accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the adding amount of the MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the end of the venting, the particle board of this comparative example was obtained.
Comparative example 2
The preparation process of the shaving board comprises the following steps:
(1) taking 100g of soybean modified liquid, adjusting pH to 5-6 by using a pH regulator, adding 12g of soybean flour, 2g of flour and 1g of chitosan, uniformly stirring, standing for 20min, and obtaining soybean gum after the soybean gum is fully swelled;
(2) rapidly stirring the soybean glue prepared in the step (1) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, and rapidly dropwise adding MDI curing agent (the total dropwise adding amount is 3g) in the stirring process, wherein the addition amount of the compound soybean glue accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the addition amount of MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the end of the venting, the particle board of this comparative example was obtained.
Comparative example 3
The preparation process of the shaving board capable of efficiently adsorbing formaldehyde comprises the following steps:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
the method specifically comprises the following steps:
(1.1) dissolving 10g of chitosan in 100mL of 0.5% acetic acid, adding 25g of 60-mesh active carbon into the chitosan solution after complete dissolution, and magnetically stirring for 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500mL of 50% sodium carbonate solution, stirring for 3h, and standing for layering;
(1.3) taking the layered precipitate, washing the precipitate with deionized water to be neutral, and then placing the precipitate in a vacuum drying oven at 60 ℃ for drying for 48 hours to obtain chitosan supported activated carbon;
(2) adding chitosan supported activated carbon prepared in the step (1) into 100g of soybean modified liquid, then using a pH regulator to regulate the pH to 5-6, adding 15g of soybean flour and 3g of flour, uniformly stirring, standing for 20min, and obtaining the compound soybean gum after the soybean gum is fully swelled;
(3) rapidly stirring the compound soybean gum prepared in the step (2) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, wherein the addition amount of the compound soybean gum accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the addition amount of MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the exhaust was completed, the card of the comparative example was obtained.
Comparative example 4
The preparation process of the particle board comprises the following steps:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
the method specifically comprises the following steps:
(1.1) dissolving 10g of chitosan in 100mL of 0.5% acetic acid, adding 25g of 60-mesh active carbon into the chitosan solution after complete dissolution, and magnetically stirring for 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500mL of 50% sodium carbonate solution, stirring for 3h, and standing for layering;
(1.3) taking the layered precipitate, washing the precipitate with deionized water to be neutral, and then placing the precipitate in a vacuum drying oven at 60 ℃ for drying for 48 hours to obtain chitosan supported activated carbon;
(2) adding chitosan supported activated carbon prepared in the step (1) into 100g of soybean modified liquid, then using a pH regulator to regulate the pH to 5-6, adding 15g of soybean flour and 3g of flour, uniformly stirring, standing for 20min, and obtaining the compound soybean gum after the soybean gum is fully swelled;
(3) rapidly stirring the compounded soybean gum prepared in the step (2) and fine wood shavings (the length of the fine wood shavings is less than 60mm, the width of the fine wood shavings is 5-20mm, and the thickness of the fine wood shavings is 0.2-0.8mm) in a stirrer, and rapidly dropwise adding an MDI curing agent (the total dropwise adding amount is 3g) in the stirring process, wherein the adding amount of the compounded soybean gum accounts for 10% of the weight of the fine wood shavings; stirring uniformly to obtain surface layer slurry;
(4) rapidly stirring MDI glue and coarse wood shavings (the length of the coarse wood shavings is 60-120mm, the width is 5-20mm, and the thickness is 0.2-0.8mm) in a stirrer, and uniformly stirring to obtain a core layer slurry; the adding amount of the MDI glue accounts for 8 percent of the weight of the coarse wood shavings;
(5) sequentially paving the surface layer slurry, the core layer slurry and the surface layer slurry, and placing the obtained product in a flat vulcanizing machine for hot pressing and forming, wherein the hot pressing temperature is 210 ℃, the hot pressing pressure is 3.5MPa, the hot pressing time is 3.5min, and the obtained product is fully exhausted after hot pressing, the exhaust pressure is 1.5MPa, and the exhaust time is 1 min;
after the end of the venting, the particle board of this comparative example was obtained.
The particle boards prepared in the above examples and comparative examples were unified into a size of 400mm 16mm, and the mechanical properties of each particle board were tested according to GB/T4897-.
TABLE 1
Figure BDA0002079797670000131
As can be seen from table 1, the particle boards prepared in examples 1 to 3 not only have excellent mechanical properties, but also are excellent in formaldehyde purification efficiency and durability of formaldehyde purification effect; the activated carbon in comparative example 1 is not loaded with chitosan, which results in deterioration of formaldehyde purification efficiency and durability of formaldehyde purification effect of the particle board; in the comparative example 2, the formaldehyde purification effect is worse without adding chitosan loaded active carbon; in the adhesive of the comparative example 3, chitosan is not added, and a graft polymer of chitosan and an MDI curing agent is not formed, so that the mechanical property of the shaving board is linearly reduced; in comparative example 4, although the MDI curing agent was dropped but chitosan was not added, the dropped MDI curing agent may react with chitosan loaded on the surface of the activated carbon, causing functional amino groups of chitosan to be occupied, so that formaldehyde purification efficiency and durability of formaldehyde purification effect of the particle board become poor.

Claims (9)

1. A shaving board capable of efficiently adsorbing formaldehyde comprises wood shavings, an adhesive and a formaldehyde purification material, and is characterized in that the formaldehyde purification material is chitosan loaded activated carbon or chitosan loaded charcoal;
the preparation method of the chitosan supported activated carbon or the chitosan supported charcoal comprises the following steps:
(1.1) dissolving 8-12 parts of chitosan in 100 parts of 0.5% acetic acid, adding 22-28 parts of activated carbon or charcoal, and stirring for at least 1h to obtain a suspension;
(1.2) quickly pouring the suspension into 500 parts of 50% sodium carbonate solution, stirring for at least 3h, and standing for layering;
(1.3) taking the precipitate, washing the precipitate to be neutral by deionized water, and then placing the precipitate in a drying oven at 60 ℃ for drying for at least 48h to obtain the chitosan supported activated carbon or chitosan supported charcoal.
2. A particle board for adsorbing formaldehyde with high efficiency as recited in claim 1, which comprises a core layer and surface layers on both sides of the core layer, wherein said formaldehyde purifying material is located in the surface layers.
3. A particle board for adsorbing formaldehyde with high efficiency as recited in claim 2, wherein said adhesive comprises soybean gum and a graft polymer of chitosan and MDI curing agent in said surface layer.
4. The particle board capable of efficiently adsorbing formaldehyde as claimed in claim 3, wherein the adhesive comprises the following raw materials in parts by weight: 100 parts of soybean glue modified liquid, 12-18 parts of soybean flour, 2-5 parts of viscosity regulator, 1-3 parts of chitosan and 2-4 parts of MDI curing agent.
5. The particle board for adsorbing formaldehyde with high efficiency as claimed in claim 4, wherein said surface layer comprises formaldehyde purifying material in an amount of 1.2-1.5% by weight of wood shavings, and adhesive in an amount of 8.5-10% by weight of wood shavings.
6. A particle board for adsorbing formaldehyde with high efficiency as recited in claim 2, wherein said adhesive is MDI adhesive in said core layer.
7. A particle board for adsorbing formaldehyde with high efficiency as set forth in claim 6, wherein said core layer comprises MDI glue in an amount of 7-10% by weight of said wood particles.
8. The process for preparing a particle board for adsorbing formaldehyde with high efficiency as claimed in any of claims 1 to 7, comprising the steps of:
(1) preparing chitosan supported activated carbon or chitosan supported charcoal;
(2) adding the chitosan supported activated carbon or chitosan supported charcoal into the soybean gum modifying liquid according to a preset mass percentage, adjusting the pH to 5-6, adding soybean flour, a viscosity regulator and chitosan, uniformly stirring, and standing to fully swell the soybean gum to obtain a compound soybean gum;
(3) according to the preset mass percentage, uniformly stirring the compound soybean gum and the fine wood shavings, and adding an MDI curing agent while stirring to obtain surface layer slurry;
(4) according to the preset mass percentage, uniformly stirring MDI glue and coarse wood shavings to obtain core layer slurry;
(5) and paving the surface layer slurry, the core layer slurry and the surface layer slurry in sequence, and performing hot press molding to obtain the shaving board capable of efficiently adsorbing formaldehyde.
9. A veneer particle board, which comprises a particle board, an adhesive layer and a veneer layer in sequence from the center of a board to the surface of the board, and is characterized in that the particle board is the particle board capable of efficiently adsorbing formaldehyde as claimed in any one of claims 1 to 7.
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