CN102758384A - Fabricating method of formaldehyde-free wheat straw medium density fiberboard - Google Patents
Fabricating method of formaldehyde-free wheat straw medium density fiberboard Download PDFInfo
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- CN102758384A CN102758384A CN2012101630184A CN201210163018A CN102758384A CN 102758384 A CN102758384 A CN 102758384A CN 2012101630184 A CN2012101630184 A CN 2012101630184A CN 201210163018 A CN201210163018 A CN 201210163018A CN 102758384 A CN102758384 A CN 102758384A
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Abstract
The invention relates to a fabricating method of a formaldehyde-free wheat straw medium density fiberboard, which comprises the following steps: wheat straw chemical-mechanical pulp is added with NaAc-HAc buffer to dilute pulp into wheat straw fiber suspension with mass concentration of 2-10%; coniferol-beta-D-glucoside that is 1-10% of oven dry wheat straw pulp, 0.05-0.5% of beta-glucosidase with concentration of 6.3u/mg, 1-12% of pectin colloid and 1-8% of cationic paraffin emulsion are respectively added in the suspension; and then, 10U/g-80U/g of laccase is added in the suspension to start reaction; the processed wheat straw fiber is scattered through an electric mixer; a fiberboard former is used to shape the fiberboard; excess water is removed by prepressing; and at last the fiberboard is obtained by hot pressing. By virtue of the fabricating method, the physical mechanical property and water-resistant performance of the wheat straw medium intensity fiberboard are improved; the pollution problem of free formaldehyde generated during the process of artificial board production and utilization is solved; waste materials such as crop wheat straw can be utilized; and the environment pollution is reduced.
Description
Technical field
The invention belongs to the technical field of Wood-based Panel Production, be specifically related to a kind of manufacturing approach of formaldehydeless wheat straw medium density fibre board (MDF).
Background technology
In wood adhesive; Consumption is maximum be Lauxite (Urea Formaldehyde Resin, UF), (Phenolic Formaldehyde Resin is PF) with melamine formaldehyde resin (Melamine Formaldehyde Resin for phenolic resins; MF) adhesive; In addition, (Polyurethane, PU) the adhesive demand is also in continuous increase for polyurethane.But; The raw material of above-mentioned 4 kinds of adhesive all derives from non-renewable oil product; Lauxite (UF), phenolic resins (PF) and melamine formaldehyde resin (MF) adhesive etc. all can in use be emitted free formaldehyde simultaneously, thereby bring the formaldehyde pollution problem.
Disclosed US 2006/0127659 A1 of United States Patent (USP) " preparation technology of medium density fibre board (MDF) " (MDF Press Technology); The disclosed CN101085532 of Chinese patent " technique for manufacturing formaldehyde-free turf fibre plate "; The disclosed CN102126241A of Chinese patent " a kind of heat pressing process that is used for the above high density fiberboard of 12mm "; The disclosed CN102284988A of Chinese patent " a kind of preparation method of damping fiberboard "; All be to adopt dry method or semidry method to make fiberboard, just preparation technology and condition are different.These technologies of preparing and technology are not all handled fiber; Do not utilize the incompatible performance of improving its fiberboard of chemical bonded refractory of fiber self; Just improve the performance of fiberboard through the interpolation adhesive, fiberboard intensity, water repelling property and the environmental-protecting performance of preparation are relatively poor.
Disclosed US 2011/0009530 A1 of United States Patent (USP) " manufacturing of formaldehydeless wood fibre board " (Formaldehyde-free Binders for Producing Wood Products); Disclosed US 7722712 B2 of United States Patent (USP) " based on the preparation of the formaldehyde binder of wood fibre " (Formaldehyde-free Adhesives and Lignocellulosic Composites Made From the Adhesives); The disclosed CN101791817A of Chinese patent " environment protection, low cost medium and high density fibre panel production method "; The disclosed CN201998256U of Chinese patent " no aldehyde furniture is used fiberboard "; The disclosed CN1410498 of Chinese patent " wood-based plate water base co-polymer adhesive and preparation method thereof "; The disclosed CN102304346A of Chinese patent " a kind of preparation of formaldehydeless protein-based timber adhesive and method for using "; All be the physical property that the adhesive of the chemical substance through adding phenolic aldehyde, urea aldehyde, gelatin class improves fiberboard, just simply bonding, in the process of hot pressing, do not relate to any chemical reaction; Be difficult to take into account fiberboard physical strength and environmental-protecting performance, application limit is very big.
The coniferyl alcohol glucoside can be under the effect of enzyme and polysaccharide generation polymerization.The coniferyl alcohol glucoside also can be under the effect of enzyme and pectin generation polymerization, generates pectin-lignin complex.Under the condition of hot pressing, the dehydrogenated polymers of coniferyl alcohol glucoside is an intermediate, lets pectin and wheat straw fiber better connect, and makes that high molecular weight pectin and fiber twine, IPN, thereby has improved the physical strength of fiberboard.
Summary of the invention
The purpose of this invention is to provide a kind of formaldehydeless medium density fiber plate producing process based on wheat straw fiber.Under simulating natural condition; Use pectin to be matrix; The coniferyl alcohol glucoside makes the coniferyl alcohol glucoside generation dehydrogenation polymerization reaction as the lignin predecessor under the synergy of laccase and beta-glucosidase, form the complex that dehydrogenated polymers (DHP) and this polymer and pectin form; Dehydrogenated polymers with the coniferyl alcohol glucoside is an intermediate; Let pectin and Straw Pulp fiber couple together, make that high molecular weight pectin and fiber twine, IPN, thereby improve the water repelling property of the physical strength of wheat straw fiber plate.Realize the enzyme-catalyzed polymerization system to being the enhancing of the degradation material of matrix, and eliminate the pollution problem of fiberboard formaldehyde with the wheat straw string.
Technical scheme of the present invention is: with a certain amount of wheat straw chemi-mechanical pulp (CMP), the mass concentration of wheat straw chemi-mechanical pulp is 10-30%, and beating degree is 10-30
oSR; Add NaAc-HAc buffer solution (the pH value is 2.5-6.5) slurry is diluted to the wheat straw fiber suspension that mass concentration is 2-10%; Under 20 ℃-60 ℃ constant temperature, with electric blender with the abundant stirring and evenly mixing of wheat straw fiber suspension after, add coniferyl alcohol-β-D-glucoside, the 0.05-0.5% of the 1-10% of over dry Straw Pulp quality respectively successively; 6.3u/mg beta-glucosidase, 1-12% pectin colloid and the cationic paraffin wax emulsions of 1-8% that cooling is good; Add laccase (10U/g-80U/g) again and start reaction, reaction time 1h-5h constantly stirs in this process and constant temperature is handled.For guaranteeing have enough oxygen to be used for the laccase priming reaction, in the constant temperature processing procedure with air pump bubbling air in wheat straw fiber suspension.
The wheat straw fiber of handling is broken up through electric blender, with wet processing compacting wheat straw medium density fibre board (MDF).At first moulding in the fiberboard former is removed redundant moisture through the cold press precompressed again, is hot pressed into fiberboard (L*W=500*500mm) through hot press then.Behind the equilibrium water conten 48h, preparation sample, the physical and mechanical property of mensuration fiberboard.The fiberboard design thickness is 3.0mm-9.0mm, and density is 0.5-1.0g/cm
3
Concrete hot pressing parameters is: hot pressing temperature 150-250 ℃, high pressure water squeezing section pressure is 2-10MPa, and the time is 1-10min; Pressurize 3-10min, step-down is in 1-8MPa, and moisture content is 20-60%; Dryer section pressure 2.0-10MPa, time 2-10min, moisture content are 10-30%; Fluxing zone pressure 2.0-8.0MPa, time 1-10min.
The present invention's technical scheme preferably is: to mass concentration is 15%, and beating degree is 25
oAdding NaAc-HAc buffer solution (the pH value is 5) in the wheat straw chemi-mechanical pulp of SR, to be diluted to mass concentration be 6% wheat straw fiber suspension; Behind the abundant stirring and evenly mixing of wheat straw fiber suspension; Add coniferyl alcohol-β-D-glucoside of 8% of over dry Straw Pulp quality, 0.4% beta-glucosidase, 8% pectin colloid and cationic paraffin wax emulsions respectively; The laccase that adds 60U/g again starts reaction, the wheat straw fiber of handling is broken up moulding in the fiberboard former earlier through electric blender; Remove redundant moisture through precompressed again, be hot pressed into fiberboard then.Technological parameter is during hot pressing: 200 ℃ of hot pressing temperatures, and high pressure water squeezing section pressure is 6MPa, the time is 2min, pressurize 5min, step-down is in 4MPa, and moisture content is 25%, dryer section pressure 6MPa, time 4min, moisture content are 10%, fluxing zone pressure 7.0MPa, time 6min.
The present invention has improved the physical and mechanical property and the water repelling property of wheat straw medium density fibre board (MDF); Do not produce environmental pollution (free formaldehyde pollution) again; With pectin is matrix; Under the synergy of laccase and beta-glucosidase enzyme system, make the reaction of wheat straw chemi-mechanical pulp and lignin predecessor coniferyl alcohol glucoside, can make being connected of generation chemical bond between wheat straw fiber and the lignin dehydrogenated polymers; And make between the fiber through the lignin dehydrogenated polymers and to produce crosslinkedly, produce the high and good formaldehydeless straw medium density fibre board (MDF) of water repelling property of physical strength.
Method of the present invention is reasonable, and is simple to operate, can solve the free formaldehyde pollution problem that produces in Wood-based Panel Production and the use, utilizes waste materials such as crops wheat straw straw simultaneously, can reduce environmental pollution.
Under simulating natural condition; Use pectin to be matrix; The coniferyl alcohol glucoside makes the coniferyl alcohol glucoside generation dehydrogenation polymerization reaction as the lignin predecessor under the synergy of laccase and beta-glucosidase, make the catalytic polymerization cross-linking reaction that can take place between wheat straw fiber and the lignin predecessor coniferyl alcohol glucoside; This reactive applications is in the enhancing of wheat straw medium density fibre board (MDF); Handle the wheat straw fiber plate of back preparation thickness swelling rate (Thickness Expansion Rate of Water Absorbing, TS), MOR (Modulus of Rupture, MOR), elastic modelling quantity (Modulus of Elasticity; MOE) and internal bond strength (Internal Bond; IB) all be up to state standards medium density fibre board (MDF) (MDF, GB/ T 11718 – 2009) primary standard (thickness swelling rate, MOR, elastic modelling quantity and internal bond strength be respectively≤20.0%,>=25.0MPa,>=2500MPa and>=0.60Mpa, density is 0.65-0.8g/cm
3).
The specific embodiment
Below in conjunction with embodiment technical scheme of the present invention is further described:
Embodiment 1:
(1) processing of wheat straw CMP slurry: with the wheat straw CMP over dry slurry of 1400g, the mass concentration of Straw Pulp is 20%, and beating degree is 10
oSR; Adding NaAc-HAc buffer solution (pH4.0), slurry is diluted to mass concentration is 4% wheat straw fiber suspension; Under 30 ℃ constant temperature; With electronic mix machine with the abundant stirring and evenly mixing of fibrous suspension after, add 2% good pectin colloid of coniferyl alcohol-β-D-glucoside of 2%, 0.1% beta-glucosidase, the cooling of over dry Straw Pulp quality and 3% cationic paraffin wax emulsions respectively, add the 30U/g laccase again and start reaction; Reaction time 3h constantly stirs in this process and constant temperature is handled.For guaranteeing have enough oxygen to be used for the reaction of laccase activation wheat straw fiber and lignin predecessor and pectin, in the constant temperature processing procedure with air pump bubbling air in wheat straw fiber suspension.
(2) wheat straw fiber sheet metal forming technology: the wheat straw fiber of handling is broken up through electric blender, with the wet processing pressboard.At first moulding in the fiberboard former is removed redundant moisture through the cold press precompressed again, is hot pressed into fiberboard (L*W=500*500mm) through hot press then.Behind the equilibrium water conten 48h, preparation sample, the physical and mechanical property of mensuration wheat straw medium density fibre board (MDF).The fiberboard design thickness is 8.0mm, and density is 0.7g/cm
3
(3) wheat straw fiber plate heat pressing process: concrete hot pressing parameters is: 160 ℃ of hot pressing temperatures, and high pressure water squeezing section pressure is 5MPa, the time is 3min; Pressurize 4min, step-down is in 2MPa, and moisture content is about 20%; Dryer section pressure 2.0MPa, time 4min, moisture content is about 15%; Fluxing zone pressure 4MPa, time 5min.
(4) under simulating natural condition; Use pectin to be matrix; The coniferyl alcohol glucoside is under the synergy of laccase and beta-glucosidase; Make the coniferyl alcohol glucoside generation dehydrogenation polymerization reaction as the lignin predecessor, make the catalytic polymerization cross-linking reaction that can take place between wheat straw fiber and the lignin predecessor coniferyl alcohol glucoside, this reactive applications is in the enhancing of wheat straw medium density fibre board (MDF); Handle thickness swelling rate (the Thickness Expansion Rate of Water Absorbing of the wheat straw fiber plate of back preparation; TS), MOR (Modulus of Rupture, MOR), elastic modelling quantity (Modulus of Elasticity, MOE) and internal bond strength (Internal Bond; IB) be respectively 11.5%, 26.0MPa, 2602MPa and 0.65Mpa; Above index all be up to state standards medium density fibre board (MDF) (MDF, GB/ T 11718 – 2009) primary standard (thickness swelling rate, MOR, elastic modelling quantity and internal bond strength be respectively≤20.0%,>=25.0MPa,>=2500MPa and>=0.60Mpa, density is 0.65-0.8g/cm
3).
Embodiment 2:
(1) processing of wheat straw CMP slurry: with the wheat straw CMP over dry slurry of 1400g, the mass concentration of Straw Pulp is 10%, and beating degree is 20
oSR; Adding NaAc-HAc buffer solution (pH3.0), slurry is diluted to mass concentration is 2% wheat straw fiber suspension; Under 50 ℃ constant temperature; With electric blender with the abundant stirring and evenly mixing of fibrous suspension after, add good pectin colloid of coniferyl alcohol-β-D-glucoside of 4%, 0.2% beta-glucosidase, 4% cooling of over dry Straw Pulp quality and 2% cationic paraffin wax emulsions respectively, add the 50U/g laccase again and start reaction; Reaction time 2h constantly stirs in this process and constant temperature is handled.For guaranteeing have enough oxygen to be used for the reaction of laccase activation wheat straw fiber and lignin predecessor and pectin, in the constant temperature processing procedure with air pump bubbling air in wheat straw fiber suspension.
(2) wheat straw fiber sheet metal forming technology: the wheat straw fiber of handling is broken up through electric blender, with the wet processing pressboard.At first moulding in the fiberboard former is removed redundant moisture through the cold press precompressed again, is hot pressed into fiberboard (L*W=500*500mm) through hot press then.Behind the equilibrium water conten 48h, preparation sample, the physical and mechanical property of mensuration wheat straw medium density fibre board (MDF).The fiberboard design thickness is 8.0mm, and density is 0.7g/cm
3
(3) wheat straw fiber plate heat pressing process: concrete hot pressing parameters is: 180 ℃ of hot pressing temperatures, and high pressure water squeezing section pressure is 4MPa, the time is 5min; Pressurize 8min, step-down is in 1MPa, and moisture content is about 30%; Dryer section pressure 5.0MPa, time 2min, moisture content is about 10%; Fluxing zone pressure 3MPa, time 3min.
(4) under simulating natural condition; Use pectin to be matrix; The coniferyl alcohol glucoside is under the synergy of laccase and beta-glucosidase; Make the coniferyl alcohol glucoside generation dehydrogenation polymerization reaction as the lignin predecessor, make the catalytic polymerization cross-linking reaction that can take place between wheat straw fiber and the lignin predecessor coniferyl alcohol glucoside, this reactive applications is in the enhancing of wheat straw medium density fibre board (MDF); Handle thickness swelling rate (the Thickness Expansion Rate of Water Absorbing of the wheat straw fiber plate of back preparation; TS), MOR (Modulus of Rupture, MOR), elastic modelling quantity (Modulus of Elasticity, MOE) and internal bond strength (Internal Bond; IB) be respectively 12.2%, 27.5MPa, 2800MPa and 0.70Mpa; Above index all be up to state standards medium density fibre board (MDF) (MDF, GB/ T 11718 – 2009) primary standard (thickness swelling rate, MOR, elastic modelling quantity and internal bond strength be respectively≤20.0%,>=25.0MPa,>=2500MPa and>=0.60Mpa, density is 0.65-0.8g/cm
3).
Embodiment 3:
(1) processing of wheat straw CMP slurry: with the wheat straw CMP over dry slurry of 1400g, the mass concentration of Straw Pulp is 25%, and beating degree is 15
oSR; Adding NaAc-HAc buffer solution (pH2.5), slurry is diluted to mass concentration is 8% wheat straw fiber suspension; Under 40 ℃ constant temperature; With electric blender with the abundant stirring and evenly mixing of fibrous suspension after, add good pectin colloid of coniferyl alcohol-β-D-glucoside of 6%, 0.3% beta-glucosidase, 6% cooling of over dry Straw Pulp quality and 1% cationic paraffin wax emulsions respectively, add the 20U/g laccase again and start reaction; Reaction time 2h constantly stirs in this process and constant temperature is handled.For guaranteeing have enough oxygen to be used for the reaction of laccase activation wheat straw fiber and lignin predecessor and pectin, in the constant temperature processing procedure with air pump bubbling air in wheat straw fiber suspension.
(2) wheat straw fiber sheet metal forming technology: the wheat straw fiber of handling is broken up through electric blender, with the wet processing pressboard.At first moulding in the fiberboard former is removed redundant moisture through the cold press precompressed again, is hot pressed into fiberboard (L*W=500*500mm) through hot press then.Behind the equilibrium water conten 48h, preparation sample, the physical and mechanical property of mensuration wheat straw medium density fibre board (MDF).The fiberboard design thickness is 8.0mm, and density is 0.7g/cm
3
(3) wheat straw fiber plate heat pressing process: concrete hot pressing parameters is: 150 ℃ of hot pressing temperatures, and high pressure water squeezing section pressure is 3MPa, the time is 7min; Pressurize 9min, step-down is in 3MPa, and moisture content is about 20%; Dryer section pressure 7.0MPa, time 3min, moisture content is about 12%; Fluxing zone pressure 5MPa, time 5min.
(4) under simulating natural condition; Use pectin to be matrix; The coniferyl alcohol glucoside is under the synergy of laccase and beta-glucosidase; Make the coniferyl alcohol glucoside generation dehydrogenation polymerization reaction as the lignin predecessor, make the catalytic polymerization cross-linking reaction that can take place between wheat straw fiber and the lignin predecessor coniferyl alcohol glucoside, this reactive applications is in the enhancing of wheat straw medium density fibre board (MDF); Handle thickness swelling rate (the Thickness Expansion Rate of Water Absorbing of the wheat straw fiber plate of back preparation; TS), MOR (Modulus of Rupture, MOR), elastic modelling quantity (Modulus of Elasticity, MOE) and internal bond strength (Internal Bond; IB) be respectively 11.5%, 25.3MPa, 2570MPa and 0.62Mpa; Above index all be up to state standards medium density fibre board (MDF) (MDF, GB/ T 11718 – 2009) primary standard (thickness swelling rate, MOR, elastic modelling quantity and internal bond strength be respectively≤20.0%,>=25.0MPa,>=2500MPa and>=0.60Mpa, density is 0.65-0.8g/cm
3).
Embodiment 4:
(1) processing of wheat straw CMP slurry: with the wheat straw CMP over dry slurry of 1400g, the mass concentration of Straw Pulp is 15%, and beating degree is 25
oSR; Adding NaAc-HAc buffer solution (pH5.0), slurry is diluted to mass concentration is 6% wheat straw fiber suspension; Under 50 ℃ constant temperature; With electric blender with the abundant stirring and evenly mixing of fibrous suspension after, add good pectin colloid of coniferyl alcohol-β-D-glucoside of 8%, 0.4% beta-glucosidase, 8% cooling of over dry Straw Pulp quality and 4% cationic paraffin wax emulsions respectively, add the 60U/g laccase again and start reaction; Reaction time 4h constantly stirs in this process and constant temperature is handled.For guaranteeing have enough oxygen to be used for the reaction of laccase activation wheat straw fiber and lignin predecessor and pectin, in the constant temperature processing procedure with air pump bubbling air in wheat straw fiber suspension.
(2) wheat straw fiber sheet metal forming technology: the wheat straw fiber of handling is broken up through electric blender, with the wet processing pressboard.At first moulding in the fiberboard former is removed redundant moisture through the cold press precompressed again, is hot pressed into fiberboard (L*W=500*500mm) through hot press then.Behind the equilibrium water conten 48h, preparation sample, the physical and mechanical property of mensuration wheat straw medium density fibre board (MDF).The fiberboard design thickness is 8.0mm, and density is 0.7g/cm
3
(3) wheat straw fiber plate heat pressing process: concrete hot pressing parameters is: 200 ℃ of hot pressing temperatures, and high pressure water squeezing section pressure is 6MPa, the time is 2min; Pressurize 5min, step-down is in 4MPa, and moisture content is about 25%; Dryer section pressure 6.0MPa, time 4min, moisture content is about 10%; Fluxing zone pressure 7MPa, time 6min.
(4) under simulating natural condition; Use pectin to be matrix; The coniferyl alcohol glucoside is under the synergy of laccase and beta-glucosidase; Make the coniferyl alcohol glucoside generation dehydrogenation polymerization reaction as the lignin predecessor, make the catalytic polymerization cross-linking reaction that can take place between wheat straw fiber and the lignin predecessor coniferyl alcohol glucoside, this reactive applications is in the enhancing of wheat straw medium density fibre board (MDF); Handle thickness swelling rate (the Thickness Expansion Rate of Water Absorbing of the wheat straw fiber plate of back preparation; TS), MOR (Modulus of Rupture, MOR), elastic modelling quantity (Modulus of Elasticity, MOE) and internal bond strength (Internal Bond; IB) be respectively 10.5%, 28.8MPa, 2950MPa and 0.75Mpa; Above index all be up to state standards medium density fibre board (MDF) (MDF, GB/ T 11718 – 2009) primary standard (thickness swelling rate, MOR, elastic modelling quantity and internal bond strength be respectively≤20.0%,>=25.0MPa,>=2500MPa and>=0.60Mpa, density is 0.65-0.8g/cm
3
Claims (6)
1. the manufacturing approach of a formaldehydeless wheat straw medium density fibre board (MDF) comprises the steps: that to mass concentration be 10-30%, and beating degree is 10-30
oAdd the NaAc-HAc buffer solution in the wheat straw chemi-mechanical pulp of SR and be diluted to the wheat straw fiber suspension that mass concentration is 2-10%; Behind the abundant stirring and evenly mixing of wheat straw fiber suspension; Coniferyl alcohol-β-D-the glucoside, the 0.05-0.5% that add the 1-10% of over dry Straw Pulp quality respectively, the pectin colloid of the beta-glucosidase of 6.3u/mg, 1-12% and the cationic paraffin wax emulsions of 1-8%, the laccase that adds 10U/g-80U/g again starts reaction; The wheat straw fiber of handling is broken up through electric blender; Moulding in the fiberboard former is earlier removed redundant moisture through precompressed again, is hot pressed into fiberboard then.
2. the manufacturing approach of a kind of formaldehydeless wheat straw medium density fibre board (MDF) according to claim 1 is characterized in that, the pH value of described NaAc-HAc buffer solution is 2.5-6.5.
3. the manufacturing approach of a kind of formaldehydeless wheat straw medium density fibre board (MDF) according to claim 1 is characterized in that, said hot pressing parameters is: hot pressing temperature 150-250 ℃, high pressure water squeezing section pressure is 2-10MPa; Time is 1-10min, pressurize 3-10min, and step-down is in 1-8MPa; Moisture content is 20-60%, dryer section pressure 2.0-10MPa, time 2-10min; Moisture content is 10-30%, fluxing zone pressure 2.0-8.0MPa, time 1-10min.
4. the manufacturing approach of a kind of formaldehydeless wheat straw medium density fibre board (MDF) according to claim 1 is characterized in that, comprises the steps: that to mass concentration be 15%, and beating degree is 25
oAdding the NaAc-HAc buffer solution in the wheat straw chemi-mechanical pulp of SR, to be diluted to mass concentration be 6% wheat straw fiber suspension; Behind the abundant stirring and evenly mixing of wheat straw fiber suspension; 8% the coniferyl alcohol-β-D-glucoside, 0.4% beta-glucosidase, 8% pectin colloid and 4% the cationic paraffin wax emulsions that add over dry Straw Pulp quality respectively; The laccase that adds 60U/g again starts reaction, the wheat straw fiber of handling is broken up moulding in the fiberboard former earlier through electric blender; Remove redundant moisture through precompressed again, be hot pressed into fiberboard then.
5. the manufacturing approach of a kind of formaldehydeless wheat straw medium density fibre board (MDF) according to claim 4 is characterized in that, said hot pressing parameters is: 200 ℃ of hot pressing temperatures, and high pressure water squeezing section pressure is 6MPa; Time is 2min, pressurize 5min, and step-down is in 4MPa; Moisture content is 25%, dryer section pressure 6MPa, time 4min; Moisture content is 10%, fluxing zone pressure 7.0MPa, time 6min.
6. the manufacturing approach of a kind of formaldehydeless wheat straw medium density fibre board (MDF) according to claim 4 is characterized in that, the pH value of described NaAc-HAc buffer solution is 5.
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| CN2012101630184A CN102758384A (en) | 2012-05-24 | 2012-05-24 | Fabricating method of formaldehyde-free wheat straw medium density fiberboard |
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| CN2012101630184A CN102758384A (en) | 2012-05-24 | 2012-05-24 | Fabricating method of formaldehyde-free wheat straw medium density fiberboard |
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Application publication date: 20121031 |