CN109129813A - Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process - Google Patents
Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process Download PDFInfo
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- CN109129813A CN109129813A CN201710500419.7A CN201710500419A CN109129813A CN 109129813 A CN109129813 A CN 109129813A CN 201710500419 A CN201710500419 A CN 201710500419A CN 109129813 A CN109129813 A CN 109129813A
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- Prior art keywords
- melamine
- urea
- mdf
- medium density
- wood
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- 239000000835 fiber Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 239000002023 wood Substances 0.000 claims abstract description 57
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003063 flame retardant Substances 0.000 claims abstract description 31
- 239000000853 adhesive Substances 0.000 claims abstract description 30
- 230000001070 adhesive effect Effects 0.000 claims abstract description 30
- HANVTCGOAROXMV-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine;urea Chemical compound O=C.NC(N)=O.NC1=NC(N)=NC(N)=N1 HANVTCGOAROXMV-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000007731 hot pressing Methods 0.000 claims abstract description 28
- 238000009835 boiling Methods 0.000 claims abstract description 26
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 23
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 21
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004202 carbamide Substances 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005494 condensation Effects 0.000 claims abstract description 15
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 12
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 239000003112 inhibitor Substances 0.000 claims abstract description 11
- JQYOCVPEXWBLGO-UHFFFAOYSA-N [N].[Si].[P] Chemical group [N].[Si].[P] JQYOCVPEXWBLGO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 230000002195 synergetic effect Effects 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000009413 insulation Methods 0.000 claims description 11
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000010411 cooking Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 claims 1
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 229920001807 Urea-formaldehyde Polymers 0.000 claims 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 238000003756 stirring Methods 0.000 claims 1
- 235000019256 formaldehyde Nutrition 0.000 abstract description 17
- 229960004279 formaldehyde Drugs 0.000 abstract description 11
- 238000000605 extraction Methods 0.000 abstract description 3
- 230000008961 swelling Effects 0.000 abstract description 2
- 230000013011 mating Effects 0.000 abstract 1
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 238000004513 sizing Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 239000004566 building material Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L5/00—Manufacture of veneer ; Preparatory processing therefor
-
- 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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
-
- 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
- B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
- B27N3/183—Forming the mat-edges, e.g. by cutting
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a kind of outdoor stages enhanced water resistance medium density fibre board (MDF) preparation processes, including wood raw material peeling, chips, washes, boiling softening, defibrator process, sizing, drying, applies cooling fire retardant, hot pressing of mating formation, plate, sanding cutting edge and packaging and other steps, powdery combustion inhibitor is phosphorus silicon nitrogen trielement synergistic fire retardant in the present invention, the adhesive selected in the present invention is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive, and wherein the amount of melamine accounts for 40% or more of urea and melamine amount summation.The present invention is≤8mg/100g using the burst size of methanal that Extraction method measures, reach medium density fibre board (MDF) Form aldehyde release limit standard≤9mg/100g in " GB18580-2001 wood-based plate and its product ", thickness swelling rate≤6% for 24 hours meets the medium density fibre board (MDF) performance requirement of outdoor state.
Description
Technical field
The present invention relates to plates, the in particular to preparation of medium density fibre board (MDF).
Background technique
In recent years, with the rapid development of our country's economy, living standards of the people increase substantially, and urbanization process is accelerated,
The demand of all kinds of buildings sharply increases, and interior/exterior decoration finishing is also more universal, the horizontal water of finishing lived with office space
Standard steps up, and artificial board is also widely used, and wood-based plate yield in China's alreadys exceed 2 billion cubic meters/year at present, wherein fine
The production capacity for tieing up plate is about 4800 ten thousand steres/year, but its product is mainly indoor type medium density fibre board (MDF), and outdoor use is resistance to
The moisture-proof medium density fibre board (MDF) of water is due to higher to performance quality requirements, and the quality that different manufacturers and technique are produced is irregular
Uneven, either yield or quality is all unable to satisfy the market demand at present.
Summary of the invention
In order to overcome drawbacks described above, the present invention provides the preparation process of medium density fibre board (MDF), the middle density produced is fine
Dimension plate is applied not only to outdoor, and has the function of water-proof fire-retardant.
The invention is realized by the following technical scheme:
Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process, includes the following steps:
1) wood raw material peeling: wood raw material is first put into peeling machine and carries out peeling, the bark of wood raw material contains after peeling
Amount is≤3%；
2) it chips: the wood raw material after the resulting peeling of step 1) being chipped by wood chipping equipment, obtains a length of 30-35
Millimeter, width are 20-25 millimeters, the wood chip that thickness is 4 millimeters；
3) it washes: by the wood chip cut by washing process, the impurity on wood chip being cleaned；
4) boiling softens: the wood chip of wash clean is put into boiling cylinder boiling, boiling temperature: 160 DEG C, and cooking pressure: 8MPa,
Time: 2 minutes；
5) defibrator process: the wood chip that boiling has been softened is put into mill room defibrator process, grinds chamber pressure 2-3MPa, 148-155 DEG C of temperature, grinds
Wood chip is separated into fiber by room；
6) be glued: adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive, the applied amount of adhesive
For the 15-18% of dry fibers；
7) dry: the resulting wet fiber of step 6) is entered into drying duct and is dried, dry inlet temperature 135-140
DEG C, dry 55-65 DEG C of outlet temperature；
8) apply fire retardant: after fibre storehouse is added in the powdery combustion inhibitor that mesh number is 100~200 mesh using feed auger
Conveyance conduit is uniformly mixed with suspension fiber in the duct, and fire retardant additive amount is B grades of flame-retardant boards: 100-120kg/m3；C grades
Flame-retardant board: 50-60kg/m3；
9) mat formation hot pressing: plate is mated formation after molding, hot pressing, density 760-880kg/m3, plate moisture content: 4-7%, heat
Press the time: 75-80s/mm；Hot pressing pressure: 1.5-2.5MPa, hot pressing temperature: 192-202 DEG C；
10) plate is 156-166 hours cooling；
11) sanding cutting edge: through abrasive finishing machine abrasive finishing and stock board is sawed into after plate is cooling；
12) it packs: the stock board after sawing being identified as required, is packed.
The powdery combustion inhibitor is phosphorus silicon nitrogen trielement synergistic fire retardant.
Melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive the preparation method comprises the following steps:
A. 3.3 moles of formaldehyde are taken, adjustment pH value is stirred and lower 1.04 moles of first time urea and first is added by several times 9.2
0.06 mole of secondary melamine, reaction are warming up to 94 DEG C after twenty minutes；
B. insulation reaction after forty minutes, adjusts pH value 4.5, insulation reaction 60 minutes under the conditions of 94 DEG C；
C. adjustment pH value controls temperature under the conditions of 90 DEG C 9.0, be added second 0.40 mole of melamine, heat preservation
It reacts to water number 2；
D. maintain pH value 9.0, reduce system temperature at 65 DEG C, be added second 0.2 mole of urea；
E. natural cooling after the reaction was continued 35 minutes, obtains melamine-urea-methyl aldehyde copolycondensation resin lumber gluing
Agent；
Wherein: the amount of melamine accounts for 40% or more of urea and melamine amount summation.
Beneficial effects of the present invention:
One, the powdery combustion inhibitor partial size that the present invention selects is 100~200 mesh, and good fluidity will not influence conveying uniform
And metering accuracy, will not fugitive dust, be lost it is low, the process of feeding intake will not generate waste.
Two, melamine-urea-formaldehyde (MUF) condensation copolymerization resin method of the present invention, is existed by melamine
Being added portionwise for synthesis initial stage and mid-term, also plays the effect of formaldehyde catching agent, equivalent to increase being easy to formaldehyde reaction
Material concentration can reduce the burst size of methanal of medium density fibre board (MDF), work as melamine to consume free formaldehyde as much as possible
When additive amount reaches 40% or so, the outdoor use medium density fibre board (MDF) of the detection of perforated extraction, this project production uses perforation
The burst size of methanal that extraction measures is≤8mg/100g, and it is fine to reach middle density in " GB18580-2001 wood-based plate and its product "
Tie up plate Form aldehyde release limit standard≤9mg/100g.
Three, the increase of resin added, but also the burst size of methanal of medium density fibre board (MDF) reduces, resin added of the invention is than big
In 15%, burst size of methanal reduction tends to mitigate.
Four, compared with prior art, the present invention hot pressing temperature improve, hot pressing time be appropriately extended, burst size of methanal also with
Reduction.This is because as the temperature rises, the time extends, glue reacts more complete, and glue is sufficiently inhaled during curing reaction
The free formaldehyde for not participating in reaction in MUF adhesive is received, meanwhile, the moisture that slab evaporates in hot pressing is more, muf resin
Free formaldehyde in adhesive is also more in air as moisture is discharged into outward.
Five, melamine-urea-formaldehyde (MUF) condensation copolymerization resin that the present invention uses is as adhesive, medium density fiber
Thickness swelling rate≤6% for 24 hours of plate meets the medium density fibre board (MDF) performance requirement of outdoor state.
Six, the present invention uses the phosphorus silicon nitrogen trielement synergistic fire retardant of 100~200 mesh, and by using fiber after the drying
Injection mode on negative-pressure pipeline is conveyed, 45% or more the oxygen index (OI) > of medium density fibre board (MDF) is meeting GB8624-2012 " building
Material and classification of combustion properties of building materials and products " in B1 grades of fire retardant density boards standard while, physical and mechanical property still is able to full
Furniture type medium density fibre board (MDF) (the MDF-FN used under outdoor state in sufficient GB/T11718-2009 " medium density fibre board (MDF) "
EXT) main physico-mechanical performance requirement.
Specific embodiment
Embodiment 1
Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process, includes the following steps:
1) wood raw material peeling: wood raw material is first put into peeling machine and carries out peeling, the bark of wood raw material contains after peeling
Amount is≤3%；
2) it chips: the wood raw material after the resulting peeling of step 1) being chipped by wood chipping equipment, obtains a length of 30-35
Millimeter, width are 20-25 millimeters, the wood chip that thickness is 4 millimeters；
3) it washes: by the wood chip cut by washing process, the impurity on wood chip being cleaned；
4) boiling softens: the wood chip of wash clean is put into boiling cylinder boiling, boiling temperature: 160 DEG C, and cooking pressure: 8MPa,
Time: 2 minutes；
5) defibrator process: the wood chip that boiling has been softened is put into mill room defibrator process, grinds chamber pressure 2MPa, 155 DEG C of temperature, mill room will be wooden
Piece is separated into fiber；
6) be glued: adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive, the applied amount of adhesive
It is the 15% of dry fibers；
7) dry: the resulting wet fiber of step 6) being entered into drying duct and is dried, dry 135 DEG C of inlet temperature is done
55 DEG C of dry outlet temperature；
8) apply fire retardant: the powdery combustion inhibitor that mesh number is 100 mesh is added to the conveying after fibre storehouse using feed auger
Pipeline is uniformly mixed with suspension fiber in the duct, and fire retardant additive amount is B grades of flame-retardant boards: 100kg/m3；C grades of flame-retardant boards:
50kg/m3；
9) mat formation hot pressing: plate is mated formation after molding, hot pressing, density 760kg/m3, plate moisture content: 4%, when hot pressing
Between: 75s/mm；Hot pressing pressure: 1.5MPa, hot pressing temperature: 202 DEG C；
10) plate is 166 hours cooling；
11) sanding cutting edge: through abrasive finishing machine abrasive finishing and stock board is sawed into after plate is cooling；
12) it packs: the stock board after sawing being identified as required, is packed.
The powdery combustion inhibitor is phosphorus silicon nitrogen trielement synergistic fire retardant.
Melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive the preparation method comprises the following steps:
A. 3.3 moles of formaldehyde are taken, adjustment pH value is stirred and lower 1.04 moles of first time urea and first is added by several times 9.2
0.06 mole of secondary melamine, reaction are warming up to 94 DEG C after twenty minutes；
B. insulation reaction after forty minutes, adjusts pH value 4.5, insulation reaction 60 minutes under the conditions of 94 DEG C；
C. adjustment pH value controls temperature under the conditions of 90 DEG C 9.0, be added second 0.40 mole of melamine, heat preservation
It reacts to water number 2；
D. maintain pH value 9.0, reduce system temperature at 65 DEG C, be added second 0.2 mole of urea；
E. natural cooling after the reaction was continued 35 minutes, obtains melamine-urea-methyl aldehyde copolycondensation resin lumber gluing
Agent；
Wherein: the amount of melamine accounts for 40% or more of urea and melamine amount summation.
Embodiment 2
Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process, includes the following steps:
1) wood raw material peeling: wood raw material is first put into peeling machine and carries out peeling, the bark of wood raw material contains after peeling
Amount is≤3%；
2) it chips: the wood raw material after the resulting peeling of step 1) being chipped by wood chipping equipment, obtains a length of 30-35
Millimeter, width are 20-25 millimeters, the wood chip that thickness is 4 millimeters；
3) it washes: by the wood chip cut by washing process, the impurity on wood chip being cleaned；
4) boiling softens: the wood chip of wash clean is put into boiling cylinder boiling, boiling temperature: 160 DEG C, and cooking pressure: 8MPa,
Time: 2 minutes；
5) defibrator process: the wood chip that boiling has been softened is put into mill room defibrator process, grinds chamber pressure 2.5MPa, 150 DEG C of temperature, mill room will
Wood chip is separated into fiber；
6) be glued: adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive, the applied amount of adhesive
It is the 16% of dry fibers；
7) dry: the resulting wet fiber of step 6) being entered into drying duct and is dried, dry 138 DEG C of inlet temperature is done
58 DEG C of dry outlet temperature；
8) apply fire retardant: the powdery combustion inhibitor that mesh number is 180 mesh is added to the conveying after fibre storehouse using feed auger
Pipeline is uniformly mixed with suspension fiber in the duct, and fire retardant additive amount is B grades of flame-retardant boards: 110kg/m3；C grades of flame-retardant boards:
55kg/m3；
9) mat formation hot pressing: plate is mated formation after molding, hot pressing, density 800kg/m3, plate moisture content: 6%, when hot pressing
Between: 78s/mm；Hot pressing pressure: 2MPa, hot pressing temperature: 198 DEG C；
10) plate is 160 hours cooling；
11) sanding cutting edge: through abrasive finishing machine abrasive finishing and stock board is sawed into after plate is cooling；
12) it packs: the stock board after sawing being identified as required, is packed.
The powdery combustion inhibitor is phosphorus silicon nitrogen trielement synergistic fire retardant.
The adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive.
Melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive the preparation method comprises the following steps:
A. 3.3 moles of formaldehyde are taken, adjustment pH value is stirred and lower 1.04 moles of first time urea and first is added by several times 9.2
0.06 mole of secondary melamine, reaction are warming up to 94 DEG C after twenty minutes；
B. insulation reaction after forty minutes, adjusts pH value 4.5, insulation reaction 60 minutes under the conditions of 94 DEG C；
C. adjustment pH value controls temperature under the conditions of 90 DEG C 9.0, be added second 0.40 mole of melamine, heat preservation
It reacts to water number 2；
D. maintain pH value 9.0, reduce system temperature at 65 DEG C, be added second 0.2 mole of urea；
E. natural cooling after the reaction was continued 35 minutes, obtains melamine-urea-methyl aldehyde copolycondensation resin lumber gluing
Agent；
Wherein: the amount of melamine accounts for 40% or more of urea and melamine amount summation.
Embodiment 3
Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process, includes the following steps:
1) wood raw material peeling: wood raw material is first put into peeling machine and carries out peeling, the bark of wood raw material contains after peeling
Amount is≤3%；
2) it chips: the wood raw material after the resulting peeling of step 1) being chipped by wood chipping equipment, obtains a length of 30-35
Millimeter, width are 20-25 millimeters, the wood chip that thickness is 4 millimeters；
3) it washes: by the wood chip cut by washing process, the impurity on wood chip being cleaned；
4) boiling softens: the wood chip of wash clean is put into boiling cylinder boiling, boiling temperature: 160 DEG C, and cooking pressure: 8MPa,
Time: 2 minutes；
5) defibrator process: the wood chip that boiling has been softened is put into mill room defibrator process, grinds chamber pressure 3MPa, 148 DEG C of temperature, mill room will be wooden
Piece is separated into fiber；
6) be glued: adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive, the applied amount of adhesive
It is the 18% of dry fibers；
7) dry: the resulting wet fiber of step 6) being entered into drying duct and is dried, dry 140 DEG C of inlet temperature is done
65 DEG C of dry outlet temperature；
8) apply fire retardant: the powdery combustion inhibitor that mesh number is 200 mesh is added to the conveying after fibre storehouse using feed auger
Pipeline is uniformly mixed with suspension fiber in the duct, and fire retardant additive amount is B grades of flame-retardant boards: 120kg/m3；C grades of flame-retardant boards:
60kg/m3；
9) mat formation hot pressing: plate is mated formation after molding, hot pressing, density 880kg/m3, plate moisture content: 7%, when hot pressing
Between: 80s/mm；Hot pressing pressure: 2.5MPa, hot pressing temperature: 202 DEG C；
10) plate is 166 hours cooling；
11) sanding cutting edge: through abrasive finishing machine abrasive finishing and stock board is sawed into after plate is cooling；
12) it packs: the stock board after sawing being identified as required, is packed.
The powdery combustion inhibitor is phosphorus silicon nitrogen trielement synergistic fire retardant.
The adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive.
Melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive the preparation method comprises the following steps:
A. 3.3 moles of formaldehyde are taken, adjustment pH value is stirred and lower 1.04 moles of first time urea and first is added by several times 9.2
0.06 mole of secondary melamine, reaction are warming up to 94 DEG C after twenty minutes；
B. insulation reaction after forty minutes, adjusts pH value 4.5, insulation reaction 60 minutes under the conditions of 94 DEG C；
C. adjustment pH value controls temperature under the conditions of 90 DEG C 9.0, be added second 0.40 mole of melamine, heat preservation
It reacts to water number 2；
D. maintain pH value 9.0, reduce system temperature at 65 DEG C, be added second 0.2 mole of urea；
E. natural cooling after the reaction was continued 35 minutes, obtains melamine-urea-methyl aldehyde copolycondensation resin lumber gluing
Agent；
Wherein: the amount of melamine accounts for 40% or more of urea and melamine amount summation.
Claims (3)
1. outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process, it is characterised in that include the following steps:
1) wood raw material peeling: wood raw material is first put into peeling machine and carries out peeling, the content of bark of wood raw material is after peeling
≤ 3%；
2) it chips: the wood raw material after the resulting peeling of step 1) being chipped by wood chipping equipment, obtain a length of 30-35 milli
Rice, width are 20-25 millimeters, the wood chip that thickness is 4 millimeters；
3) it washes: by the wood chip cut by washing process, the impurity on wood chip being cleaned；
4) boiling softens: the wood chip of wash clean is put into boiling cylinder boiling, boiling temperature: 160 DEG C, and cooking pressure: 8MPa, when
Between: 2 minutes；
5) defibrator process: the wood chip that boiling has been softened is put into mill room defibrator process, grinds chamber pressure 2-3MPa, 148-155 DEG C of temperature, mill room will
Wood chip is separated into fiber；
6) be glued: adhesive is melamine-urea-formaldehyde (MUF) condensation copolymerization resin adhesive, and the applied amount that adhesive is is
The 15-18% of dry fibers；
7) dry: the resulting wet fiber of step 6) being entered into drying duct and is dried, dry 135-140 DEG C of inlet temperature is done
55-65 DEG C of dry outlet temperature；
8) apply fire retardant: the powdery combustion inhibitor that mesh number is 100~200 mesh is added to the conveying after fibre storehouse using feed auger
Pipeline is uniformly mixed with suspension fiber in the duct, and fire retardant additive amount is B grades of flame-retardant boards: 100-120kg/m3；C grades fire-retardant
Plate: 50-60kg/m3；
9) mat formation hot pressing: plate is mated formation after molding, hot pressing, density 760-880kg/m3, plate moisture content: 4-7%, when hot pressing
Between: 75-80s/mm；Hot pressing pressure: 1.5-2.5MPa, hot pressing temperature: 192-202 DEG C；
10) plate is 156-166 hours cooling；
11) sanding cutting edge: through abrasive finishing machine abrasive finishing and stock board is sawed into after plate is cooling；
12) it packs: the stock board after sawing being identified as required, is packed.
2. outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process according to claim 1, it is characterised in that: the powder
Shape fire retardant is phosphorus silicon nitrogen trielement synergistic fire retardant.
3. outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process according to claim 1, it is characterised in that: described three
Poly cyanamid-urea-formaldehyde (MUF) condensation copolymerization resin adhesive the preparation method comprises the following steps:
A. 3.3 moles of formaldehyde are taken, adjustment pH value stirs 1.04 moles of the lower first time urea of addition by several times and for the first time three 9.2
0.06 mole of poly cyanamid, reaction is warming up to 94 DEG C after twenty minutes；
B. insulation reaction after forty minutes, adjusts pH value 4.5, insulation reaction 60 minutes under the conditions of 94 DEG C；
C. adjustment pH value controls temperature under the conditions of 90 DEG C 9.0, be added second 0.40 mole of melamine, insulation reaction
To water number 2；
D. maintain pH value 9.0, reduce system temperature at 65 DEG C, be added second 0.2 mole of urea；
E. natural cooling after the reaction was continued 35 minutes, obtains melamine-urea-methyl aldehyde copolycondensation resin lumber adhesive；
Wherein: the amount of melamine accounts for 40% or more of urea and melamine amount summation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710500419.7A CN109129813A (en) | 2017-06-27 | 2017-06-27 | Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process |
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|---|---|---|---|
| CN201710500419.7A CN109129813A (en) | 2017-06-27 | 2017-06-27 | Outdoor stages enhanced water resistance medium density fibre board (MDF) preparation process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111775256A (en) * | 2020-06-30 | 2020-10-16 | 惠州市岳鑫人造板有限公司 | Preparation method of energy-saving wood fiber |
| CN113815082A (en) * | 2021-08-27 | 2021-12-21 | 大亚人造板集团有限公司 | Production process of formaldehyde-free flame-retardant fiberboard |
| CN117681299A (en) * | 2023-11-20 | 2024-03-12 | 广西百色丰林人造板有限公司 | Flame-retardant carbon crystal medium-density fiberboard and preparation method thereof |
-
2017
- 2017-06-27 CN CN201710500419.7A patent/CN109129813A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111775256A (en) * | 2020-06-30 | 2020-10-16 | 惠州市岳鑫人造板有限公司 | Preparation method of energy-saving wood fiber |
| CN113815082A (en) * | 2021-08-27 | 2021-12-21 | 大亚人造板集团有限公司 | Production process of formaldehyde-free flame-retardant fiberboard |
| CN113815082B (en) * | 2021-08-27 | 2022-11-01 | 大亚人造板集团有限公司 | Production process of formaldehyde-free flame-retardant fiberboard |
| CN117681299A (en) * | 2023-11-20 | 2024-03-12 | 广西百色丰林人造板有限公司 | Flame-retardant carbon crystal medium-density fiberboard and preparation method thereof |
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