CN106313258A - Technique for manufacturing boards from corn cob residues - Google Patents
Technique for manufacturing boards from corn cob residues Download PDFInfo
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- CN106313258A CN106313258A CN201610834634.6A CN201610834634A CN106313258A CN 106313258 A CN106313258 A CN 106313258A CN 201610834634 A CN201610834634 A CN 201610834634A CN 106313258 A CN106313258 A CN 106313258A
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- Prior art keywords
- xylose residue
- sheet material
- xylose
- residue
- lignin
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- 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
- B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
-
- 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
-
- 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
- B27N3/08—Moulding or pressing
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
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- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a technique for manufacturing boards from corn cob residues. The technique for manufacturing the boards from the corn cob residues comprises the steps that purifying, dehydration, drying and smashing of the corn cob residues are conducted, phenolic resin glue is prepared, and the corn cob residue boards are manufactured; and finally, the corn cob residue boards which are porous, light, high in strength and tenacity and capable of being applied to the fields of interior wall decoration, wall sound insulation, heat preservation layers and the like are formed through processing. The corn cob residue boards meet market demands, are wide in application range, good in market prospect, wide in raw material source and low in development cost and have good social and economic benefits.
Description
Technical field
The present invention relates to technical field of board processing, a kind of xylose residue prepares the process of sheet material.
Background technology
The sheet materials such as plywood, particieboard, density fiber board typically use wooden or wood flour to be that raw material is prepared from, wood
Though lumber sense of touch is the most comfortable, but easily imbibition or drying distortions, and wooden boards insufficient strength easily warps, delamination.
The raw material of sheet material made above is the most wooden or wood flour, is all to utilize the forest reserves, but in recent years, along with economic sends out
Exhibition, the enhancing of people's environmental protection consciousness, energy resource consumption is increasing, and the forest reserves are more and more shorter, deficient, country for
The attitude " protected forest resources " is the brightest and the clearest, takes forest to limit and cuts down, prohibits the dynamics of the measure of cutting down and strengthen the most again and again, starts and real
Having executed " Natural Forest Protection Project ", current China annual wood supply breach 4000 ten thousand stere, sheet material production industry also receives huge
Challenge, demand is increasing, and raw material is reducing, and seeks new material and replaces natural timber production sheet material to become sheet material industry
Figure existence, the choosing of the certainty sought development.
Xylose residue with agricultural wastes such as corn cob, bagasse, Phyllostachys pubescens Mazei ex H.de Lebaie bits for raw material production xylose product after produce
Solid leftover bits and pieces, it is mainly composed of cellulose and lignin, is a kind of extraordinary Renewable resource.The current xylose of China produces
More than 200,000 tons, can produce the xylose residue of 1,200,000 tons every year, a main uses part for these xylose residues is that instead of fire coal
Carrying out biomass power generation, some is that peasant buys and carries out cultivating edible, and value is relatively low, therefore, solves xylose
The recycling of slag, its added value that improves, to turn waste into wealth be current each enterprise urgent problem.The degree of depth about xylose residue is combined
Close utilize, Chinese patent 201410579754.7 disclose one utilize high boiling alcohol for solvent, under the effect of catalyst, effectively
The method of the lignin in separating xylose slag.Chinese patent 201410785234.1 discloses with xylose residue as raw material, and phosphoric acid is
Activator, preprocessed carbonization, activate, wash be dried prepare activated carbon product.Chinese patent 201410558740.7 discloses
A kind of method efficiently utilizing xylose residue to produce fatty acid (biodiesel) by muddy Rhodococcus fascians.Chinese patent
201210547077.1 disclose a kind of leftover bits and pieces xylose residue with xylose production as raw material, through hydroxyl radical free radical active oxygen for changing
Learn medicament, prepare microcrystalline Cellulose product through catalysis, oxidation, bleaching process.Chinese patent 201410168809.5 discloses one
Plant the process route utilizing self flocculation saccharomycetes strain xylose-fermenting slag enzymolysis solution to produce ethanol.All above with xylose residue as raw material
Produce the product such as lignin, activated carbon, biodiesel, microcrystalline Cellulose, ethanol all because of technological process length and complexity, to environment,
Controlling parameter etc. and require harshness, wastewater discharge is big, and energy consumption is high, and high in cost of production factor, industrialization is very restricted, big portion
Divide and only reside within the laboratory research stage.And replace wood materials to prepare plywood, particieboard, density with xylose residue for raw material
The Patents of the sheet materials such as fibre board have not been reported.
Summary of the invention
The technical assignment of the present invention is to provide a kind of xylose residue and prepares the process of sheet material.
The technical assignment of the present invention realizes in the following manner, and the processing step that this xylose residue prepares sheet material is as follows:
1) purify: taking xylose residue, add suitable quantity of water being diluted to mass percent concentration is 5-10%, the most continuously stirred, root
According to action of gravity, the silt in xylose residue, stone, fragment of brick, iron block impurity can be deposited to bottom, collect the xylose that upper strata suspends
Slag, the xylose residue liquid being purified；
2) dehydration: remove, with dehydration device, the most of moisture content purified in xylose residue liquid, obtain moisture content mass percent and contain
Amount is the dehydration xylose residue of 50-60%；
3) it is dried, pulverizes: in drying device, control operation temperature and be 70-80 DEG C, the xylose residue after drying and dehydrating, will
Its moisture control is less than 5% in mass percentage content, is then crushed to 100-200 mesh with pulverizer, standby；
4) preparation of phenolic resin glue: take a certain amount of xylose residue, adds quality hundred by the 1:5-10 of its dry biomass
Proportion by subtraction concentration is the sodium hydroxide solution of 1-2%, and at 70-90 DEG C, insulated and stirred is reacted 2-4 hour, and make in xylose residue is wooden
Element is dissolved in aqueous slkali, utilizes flame filter press to be separated with cellulose by lignin liquid, obtains the alkaline solution of lignin, then
Add phenol according to the amount of lignin in alkaline solution, and import in reactor, be heated to 90-100 DEG C, make Liquefaction Products in Phenol, and
It is uniformly mixed with lignin, is then cooled to 70-80 DEG C, add formalin for the first time, after reacting 1-2 hour, then drop
After warm to 50-60 DEG C, second time adds formalin, then reacts 1-2 hour, is eventually adding carbamide, with the formaldehyde that reaction is remaining,
The phenolic resin glue of rufous is obtained after 0.5-1 hour, standby；
5) xylose residue preparation of plates: described xylose residue after being dried, pulverizing and described phenolic resin glue are entered
Row mixing, sends into after stirring in plate spreading machine, when forming the slab that even density is stable, thickness is consistent on guipure
After, carrying out pre-press operation, control preload pressure is 10-20MPa, then by heating of plate blank to 185-195 DEG C, keeps 5-10 minute
After carry out hot press operation, control hot pressing pressure is 2.5-3.5MPa, finally naturally cools to room temperature, takes out product, jagsaw limit, enterprise
Mouth processing, the processing of painting limit, detection operation obtain xylose residue sheet material finished product.
Described step 2) in dehydration device be centrifuge or flame filter press.
Described step 3) in drying device be vacuum drying oven or fluid bed dryer.
Described step 4) in, phenol addition is 1:1-1.5 with the amount mass ratio of lignin in alkaline solution.
Described step 4) in, the amount adding formalin for the first time is phenol and the 1.5-of dry lignin gross mass
2.0 again；It is phenol and 0.1-0.5 times of dry lignin gross mass that second time adds the amount of formalin.
Described step 4) in, the amount that carbamide adds is the 10-50% that second time adds formalin quality.
Described step 5) in, xylose residue and the mass ratio of phenolic resin glue after being dried, pulverizing are 1:1-
1.5。
Compared to the prior art the xylose residue of the present invention prepares the process of sheet material, has the advantages that
1) exploitation of xylose residue sheet material can effectively utilize and produce the waste residue that xylose product produces, and reduce forest
Felling and importation of timber, turn waste into wealth, and the phenolic resin glue of use utilizes part xylose residue to replace phenol in preparation process,
Development cost is cheaper, has higher added value.
2) production technology is simple, energy-conserving and environment-protective, and product has porous, lightweight, the feature such as high-strength, can be used for inner wall decoration,
The fields such as body of wall sound insulation, heat-insulation layer, have adapted to the market demand, applied range, and market prospect is good, and meanwhile, raw material sources are wide, open
Send out low cost, there is good Social benefit and economic benefit.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1:
1) purification of xylose residue: take 100kg butt xylose residue, adds 1900kg industry water and is diluted to mass percent concentration and be
5%, the most continuously stirred, according to action of gravity, the impurity such as silt in xylose residue, stone, fragment of brick, iron block can be deposited to the end
Portion, collects the xylose residue that upper strata suspends, the xylose residue liquid 1800kg being purified；
2) dehydration: remove the most of moisture content purified in xylose residue liquid with centrifuge, obtain moisture content mass percentage content
It is the dehydration xylose residue 180kg of 50%；
3) being dried, pulverize: utilize the xylose residue after vacuum drying oven drying and dehydrating, controlling operation temperature is 70 DEG C, is dried
It is 4.5% to its moisture content mass percentage content, is then crushed to 100 mesh with Universalpulverizer, the wood after being pulverized
Sugar slag 94kg, standby；
4) preparation of phenolic resin glue: take 1000kg butt xylose residue, adds quality hundred by the 1:5 of its dry biomass
Proportion by subtraction concentration is the sodium hydroxide solution 5000kg of 1%, and at 90 DEG C, insulated and stirred is reacted 4 hours, and make in xylose residue is wooden
Element is dissolved in aqueous slkali, utilizes flame filter press to be separated with cellulose by lignin liquid, obtains the alkaline solution of lignin
5300kg, wherein butt lignin accounts for 305kg, adds 234kg phenol product, imports in reactor, is heated to 90 DEG C, makes benzene
Phenol liquefies, and is uniformly mixed with lignin, is then cooled to 70 DEG C, adds 876kg formalin, after reacting 2 hours, then
After being cooled to 50 DEG C, second time adds 292kg formalin, then reacts 1 hour, is eventually adding 146kg carbamide, to react remaining
Formaldehyde, obtain the phenolic resin glue 6800kg of rufous after about 1 hour, standby；
5) xylose residue preparation of plates: by 94kg through being dried, pulverize after xylose residue and 123kg phenolic resin glue mix
Closing, send in plate spreading machine after stirring, when being formed on guipure, even density is stable, thickness is consistent, it is certain to have
After the slab of degree of compaction, carrying out pre-press operation, control preload pressure is 10MPa, then by heating of plate blank to 185 DEG C, keeps 10
Carrying out hot press operation after minute, control hot pressing pressure is 3.5MPa, finally naturally cools to room temperature, takes out product, jagsaw limit, enterprise
Mouth processing, the processing of painting limit, detection operation obtain xylose residue sheet material finished product.
Embodiment 2:
1) purification of xylose residue: take 100kg butt xylose residue, adds 900kg industry water and is diluted to mass percent concentration and be
10%, the most continuously stirred, according to action of gravity, the impurity such as silt in xylose residue, stone, fragment of brick, iron block can be deposited to the end
Portion, collects the xylose residue that upper strata suspends, the xylose residue liquid 950kg being purified；
2) dehydration: remove the most of moisture content purified in xylose residue liquid with flame filter press, obtain moisture content mass percent
Content is the dehydration xylose residue 160kg of 60%；
3) being dried, pulverize: utilize the xylose residue after fluid bed dryer drying and dehydrating, controlling operation temperature is 80 DEG C, dry
Dry is 4% to moisture content mass percentage content, is then crushed to 200 mesh with Universalpulverizer, the xylose after being pulverized
Slag 100kg, standby；
4) preparation of phenolic resin glue: take 500kg butt xylose residue, adds quality hundred by the 1:10 of its dry biomass
Proportion by subtraction concentration is the sodium hydroxide solution 5000kg of 2%, and at 70 DEG C, insulated and stirred is reacted 2 hours, and make in xylose residue is wooden
Element is dissolved in aqueous slkali, utilizes flame filter press to be separated with cellulose by lignin liquid, obtains the alkaline solution of lignin
5200kg, wherein butt lignin accounts for 225kg, adds 225kg phenol product, imports in reactor, is heated to 100 DEG C, makes
Liquefaction Products in Phenol, and be uniformly mixed with lignin, then it is cooled to 80 DEG C, adds 900kg formalin, after reacting 1 hour,
After being cooled to 60 DEG C again, second time adds 45kg formalin, then reacts 2 hours, is eventually adding 4.5kg carbamide, to react residual
Remaining formaldehyde, obtains the phenolic resin glue 6300kg of rufous after about 0.5 hour, standby；
5) xylose residue preparation of plates: by 100kg through being dried, pulverize after xylose residue and 100kg phenolic resin glue
Mixing, sends into after stirring in plate spreading machine, and when being formed on guipure, even density is stable, thickness is consistent, have one
After determining the slab of degree of compaction, carrying out pre-press operation, control preload pressure is 20MPa, then by heating of plate blank to 195 DEG C, keeps 5
Carrying out hot press operation after minute, control hot pressing pressure is 2.5MPa, finally naturally cools to room temperature, takes out product, jagsaw limit, enterprise
Mouth processing, the processing of painting limit, detection operation obtain xylose residue sheet material finished product.
Embodiment 3:
1) purification of xylose residue: take 100kg butt xylose residue, adds 1230kg industry water and is diluted to mass percent concentration and be
7.5%, the most continuously stirred, according to action of gravity, the impurity such as silt in xylose residue, stone, fragment of brick, iron block can be deposited to the end
Portion, collects the xylose residue that upper strata suspends, the xylose residue liquid 1300kg being purified；
2) dehydration: remove the most of moisture content purified in xylose residue liquid with flame filter press, obtain moisture content mass percent
Content is the dehydration xylose residue 170kg of 55%；
3) being dried, pulverize: utilize the xylose residue after vacuum drying oven drying and dehydrating, controlling operation temperature is 75 DEG C, is dried
It is 4.7% to moisture content mass percentage content, is then crushed to 150 mesh with Universalpulverizer, the xylose after being pulverized
Slag 98kg, standby；
4) preparation of phenolic resin glue: take 500kg butt xylose residue, adds quality by the 1:7.5 of its dry biomass
Percent concentration is the sodium hydroxide solution 3750kg of 1.5%, and at 80 DEG C, insulated and stirred is reacted 3 hours, makes in xylose residue
Lignin dissolution, in aqueous slkali, utilizes flame filter press to be separated with cellulose by lignin liquid, and the alkalescence obtaining lignin is molten
Liquid 3900kg, wherein butt lignin accounts for 240kg, adds 160kg phenol product, imports in reactor, is heated to 95 DEG C, makes
Liquefaction Products in Phenol, and be uniformly mixed with lignin, then it is cooled to 75 DEG C, adds 700kg formalin, react 1.5 hours
After, then after being cooled to 55 DEG C, second time adds 120kg formalin, then reacts 1.5 hours, is eventually adding 36kg carbamide, with instead
Answer remaining formaldehyde, after about 45 minutes, obtain the phenolic resin glue 4900kg of rufous, standby；
5) xylose residue preparation of plates: by 98kg through being dried, pulverize after xylose residue and 147kg phenolic resin glue mix
Closing, send in plate spreading machine after stirring, when being formed on guipure, even density is stable, thickness is consistent, it is certain to have
After the slab of degree of compaction, carrying out pre-press operation, control preload pressure is 15MPa, then by heating of plate blank to 190 DEG C, keeps 7.5
Carrying out hot press operation after minute, control hot pressing pressure is 3.0MPa, finally naturally cools to room temperature, takes out product, jagsaw limit, enterprise
Mouth processing, the processing of painting limit, detection operation obtain xylose residue sheet material finished product.
The xylose residue sheet material manufactured experimently for raw material with xylose residue, according to " GB/T 4897-2015 particieboard ", " GB 18580-
Form aldehyde release limitation in 2008 indoor decorating and refurnishing materials wood-based plates and goods thereof " detection, its detection data are shown in Table 1:
The assay of table 1 xylose residue sheet material
| Inspection content | Unit | Standard specification | Assay |
| Moisture content | % | 4-13 | 7 |
| Density | g/cm3 | 0.4-0.9 | 0.7 |
| MOR | MPa | ≥14 | 20 |
| The modulus of elasticity in static bending | MPa | ≥1800 | 2850 |
| Internal bond strength | MPa | ≥0.4 | 0.99 |
| Surface bonding strength | MPa | ≥0.8 | 1.31 |
| 2h thickness swelling rate | % | ≤8.0 | 3.6 |
| Surface nail-holding ability | N | ≥1100 | 1322.6 |
| Side nail-holding ability | N | ≥700 | 1166.9 |
| Burst size of methanal | Mg/100g | ≤ 0.35 (super E0 level) | 0.06 |
Remarks: 1MPa=1N/mm2
As can be seen from Table 1, xylose residue sheet material prepared by the present invention, comply fully with GB/T 4897-2015, GB 18580-
The standard-required of 2008.
Table 2 xylose residue sheet material and wooden flake board, mechanical property contrast table (unit: the N/ of wooden medium density fibre board (MDF)
mm2)
| The name of an article | Transverse strength (MOR) | Elastic modelling quantity (MOE) | Internal bonding strength (IB) |
| Wooden flake board | ≥15.0 | ≥2500 | ≥0.35 |
| Wooden medium density fibre board (MDF) | ≥24.0 | ≥2400 | ≥0.60 |
| Xylose residue sheet material | ≥18.7 | ≥3000 | ≥1.33 |
As can be seen from Table 2, the xylose residue sheet material that prepared by the present invention is better than wooden plane in mechanics, mechanical properties comprehensively
Card, partial properties exceedes wooden medium density fibre board (MDF), and xylose residue sheet material can replace wooden medium density fibre board (MDF) and wood completely
Matter particieboard.
By detailed description of the invention above, described those skilled in the art can readily realize the present invention.But should
Working as understanding, the present invention is not limited to above-mentioned several detailed description of the invention.On the basis of disclosed embodiment, described technology
The technical staff in field can the different technical characteristic of combination in any, thus realize different technical schemes.
Claims (7)
1. xylose residue prepares the process of sheet material, it is characterised in that the processing step that this xylose residue prepares sheet material is as follows:
1) purify: taking xylose residue, add suitable quantity of water being diluted to mass percent concentration is 5-10%, the most continuously stirred, according to weight
Power effect, the silt in xylose residue, stone, fragment of brick, iron block impurity can be deposited to bottom, collect the xylose residue that upper strata suspends, obtain
To the xylose residue liquid purified；
2) dehydration: removing, with dehydration device, the most of moisture content purified in xylose residue liquid, obtaining moisture content mass percentage content is
The dehydration xylose residue of 50-60%；
3) it is dried, pulverizes: in drying device, control operation temperature and be 70-80 DEG C, the xylose residue after drying and dehydrating, Jiang Qishui
Part controls in mass percentage content to be less than 5%, is then crushed to 100-200 mesh with pulverizer, standby；
4) preparation of phenolic resin glue: take a certain amount of xylose residue, adds mass percent by the 1:5-10 of its dry biomass
Concentration is the sodium hydroxide solution of 1-2%, and at 70-90 DEG C, insulated and stirred is reacted 2-4 hour, makes the lignin in xylose residue molten
Solution, in aqueous slkali, utilizes flame filter press to be separated with cellulose by lignin liquid, obtains the alkaline solution of lignin, further according to
In alkaline solution, the amount of lignin adds phenol, and imports in reactor, is heated to 90-100 DEG C, makes Liquefaction Products in Phenol, and with wood
Quality is uniformly mixed, and is then cooled to 70-80 DEG C, adds formalin for the first time, after reacting 1-2 hour, then is cooled to
After 50-60 DEG C, second time adds formalin, then reacts 1-2 hour, is eventually adding carbamide, with the formaldehyde that reaction is remaining, 0.5-
The phenolic resin glue of rufous is obtained after 1 hour, standby；
5) xylose residue preparation of plates: described xylose residue after being dried, pulverizing and described phenolic resin glue are mixed
Close, send in plate spreading machine after stirring, after forming, on guipure, the slab that even density is stable, thickness is consistent,
Carrying out pre-press operation, control preload pressure is 10-20MPa, then by heating of plate blank to 185-195 DEG C, after keeping 5-10 minute
Carrying out hot press operation, control hot pressing pressure is 2.5-3.5MPa, finally naturally cools to room temperature, takes out product, jagsaw limit, tongue and groove
Processing, the processing of painting limit, detection operation obtain xylose residue sheet material finished product.
Xylose residue the most according to claim 1 prepares the process of sheet material, it is characterised in that described step 4) in,
Phenol addition is 1:1-1.5 with the amount mass ratio of lignin in alkaline solution.
Xylose residue the most according to claim 1 prepares the process of sheet material, it is characterised in that described step 4) in,
Adding for the first time the amount of formalin is phenol and 1.5-2.0 times of dry lignin gross mass；Second time adds formalin
Amount be phenol and 0.1-0.5 times of dry lignin gross mass.
Xylose residue the most according to claim 3 prepares the process of sheet material, it is characterised in that described step 4) in,
The amount that carbamide adds is the 10-50% that second time adds formalin quality.
Xylose residue the most according to claim 1 prepares the process of sheet material, it is characterised in that described step 5) in,
Xylose residue and the mass ratio of phenolic resin glue after being dried, pulverizing are 1:1-1.5.
Xylose residue the most according to claim 1 prepares the process of sheet material, it is characterised in that described step 2) in de-
Water device is centrifuge or flame filter press.
Xylose residue the most according to claim 1 prepares the process of sheet material, it is characterised in that described step 3) in dry
Dry device is vacuum drying oven or fluid bed dryer.
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| CN108863247A (en) * | 2017-10-13 | 2018-11-23 | 济宁明升新材料有限公司 | A kind of foam water adobe for building and preparation method thereof |
| CN113601658A (en) * | 2021-09-02 | 2021-11-05 | 西北农林科技大学 | Adhesive-free formaldehyde-free green eucommia composite board and preparation method thereof |
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