CN104290168B - The preparation method of aqueous polyurethane heat cure composite fiber plate - Google Patents

The preparation method of aqueous polyurethane heat cure composite fiber plate Download PDF

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CN104290168B
CN104290168B CN201410402943.7A CN201410402943A CN104290168B CN 104290168 B CN104290168 B CN 104290168B CN 201410402943 A CN201410402943 A CN 201410402943A CN 104290168 B CN104290168 B CN 104290168B
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weight percent
aqueous polyurethane
percent content
pressure
hot pressing
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CN104290168A (en
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牛琦
纪良
李英俊
樊茂祥
陈广捷
张翔
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DONGYING ZHENGHE WOOD INDUSTRY Co Ltd
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DONGYING ZHENGHE WOOD INDUSTRY Co Ltd
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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
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres 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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding 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
    • 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
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • 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
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • 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
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/08—Polyurethanes from polyethers

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

A kind of preparation method of aqueous polyurethane heat cure composite fiber plate, select fresh poplar sheet as primary raw material, and add sawdust replace a part of wood chip do raw material, after heat grinding fibre is processed through pre-cooked, steaming and decocting, apply aqueous polyurethane and do adhesive, dry run adds nano silicon as auxiliary agent, enter continuous flat press compacting after sorted, molding of mating formation and form.This product burst size of methanal is well below GB18580 2001 " Form aldehyde release limitation in indoor decorating and refurnishing materials wood-based plate and goods thereof " requirement, close to " zero " level；TVOC gas content reaches environmental standard HJ571 2010 " environmental labelling product authentication techniques require wood-based plate and goods thereof " 0.5mg/ (m2H) the most claimed below；This product reaches 100kg/m at resin added3Time above, the moisture-proof function identical with the fibre board that tradition isocyanates produces can be reached, but cost to reduce about 8.5% than with isocyanates.

Description

The preparation method of aqueous polyurethane heat cure composite fiber plate
Technical field
The invention belongs to Wood-based Panel Production technical field, be a kind of novel environment friendly decoration type sheet material technique, particularly to one Plant the preparation method of the aqueous polyurethane heat cure composite fiber plate of ultralow TVOC release.
Background technology
As the wood-based plate of Dicoration base material, the pollution of free formaldehyde is known, and other kinds of organic volatile The most usually ignored by people.TVOC is the general name of VOC, and its composition is extremely complex, common have formaldehyde, benzene, two Toluene, ammonia, chloroform, naphthalene, diisocyanates etc., be the arch-criminal of indoor decoration pollution.TVOC is safe to the human body strong Health has tremendous influence: when the TVOC in room reaches finite concentration, and in the short time, people can feel headache, Nausea and vomiting, weary Power etc., if leaving scene not in time, can twitch time serious, going into a coma, hypomnesis, the liver of harm people, kidney, brain and god Through system.
The release of wood-based plate VOC from raw material, be hot-pressed onto end processing sequences and all can exist, the scholar's research such as Long Ling finds dry Dry temperature and whole moisture content are relatively big on the impact of VOC burst size, thus have scholar to be optimized timber drying, obtained Its VOC of wood-based plate release decrease；Some scholar's research find to do wood-based plate surface and process and also reduce VOC and release simultaneously High-volume；In addition many scholars (such as Douglas, Wang) researchs find hot pressing temperatures, hot pressing time, glue kind, seeds change right Wood-based plate VOC release has impact in various degree；Document " in car compartment, VOC inquires into and adhesive solution countermeasure " emphasis is from material Material sets out and inquires into the solution countermeasure of the adhesive reducing car indoor VOC release.
Summary of the invention
The present invention provide a kind of production. art simple, easily controllable with wood fibre as raw material, to apply aqueous polyurethane raw The method producing the aqueous polyurethane heat cure composite fiber plate of ultralow TVOC release, and had by the utilization of external release agent technology The TVOC that reduces of effect discharges, and the fibre board that the more traditional isocyanates of cost produces is low by about 8.5%.
To achieve these goals, technical scheme comprises the following steps:
(1) by long 40-60mm, wide 15-30mm, the clean sheet of log of thick 2-6mm is washed, and removes the miscellaneous of wood chip surface Matter；
(2) wood chip after washing is pumped into pre-cooked cylinder by wood chip, is simultaneously introduced sawdust composition inserts, at the beginning of carrying out Step softens, and the ratio that wherein sawdust adds is not more than the 50% of inserts total amount；Delivered in steaming and decocting cylinder by cork screw the most again Steaming and decocting, softens further, and the steam pressure in steaming and decocting cylinder is 0.70-0.80MPa, digestion time 3-5 minute；
(3) chip steaming enters the mill room solution fibre of defibrator the most afterwards, accounts for bone dry fiber quality toward addition in mill room simultaneously The waterproofing agent of 1-1.5%；The pressure of mill room, less than the pressure 0.01-0.02MPa of steaming and decocting cylinder, improves grinding of fiber by pressure reduction Mill quality；
(4) fiber after grinding applies to account for the Aqueous Polyurethane Adhesives of bone dry fiber quality 2-4%, is dried and keeps it Moisture content is at 8-13%, and carry out mating formation molding；Then hot press hot pressing is entered through precompressed, upper and lower steel band to hot press during hot pressing Surface sprinkling 1-2 ml/m2Remover, use outer ejection technique, slab uses the mode hot pressing of continuous flat to become fiber Plate；Described adhesive Aqueous Polyurethane Adhesives；Hot pressing temperature during described hot pressing is 200-220 DEG C, hot pressing speed 10-15 S/mm, hot pressing pressure 2.0-5.0MPa.
In order to reach superior technique effect, such scheme more preferably:
Described step (1) is selected fresh poplar brush wood carry out prepared log sheet of chipping.
In described step (4), Aqueous Polyurethane Adhesives is preferably by Waterborne Polyurethane Prepolymer and melamine modified urea-formaldehyde Being mixed with of resin precondensate liquid forms, concrete reactions steps:
1) synthesis of hydrophilic polyurethane performed polymer:
A. in the reactor equipped equipped with mechanical agitation, nitrogen, temperature controller, constant pressure funnel, condensing reflux Add the polyether polyol (N220) of metering, polyether polyol (N330), toluene di-isocyanate(TDI) (TDI), diphenyl methane two Isocyanates (MDI), controlling reaction temperature is 50～60 DEG C；
B. 2 are added, 2-dihydromethyl propionic acid (DMPA), diglycol (DEG), it is incubated 1.5～2h；
C. it is warming up to 65～75 DEG C, adds triethylamine, dibutyl tin laurate, stir 10～20min, and be slowly added dropwise Diglycol (PAPI), drips complete in 1.5h；
D. every the concentration of 5～10min detection-NCO, when-NCO content is unchanged, adjustment and control system pH is 7.0～7.5, Add N-normal-butyl-3-aminopropyl trimethoxysilane (KH-558), after 10min, add double (trimethoxy is silica-based) the propyl group amine of N-N- (BTMSPA), cooling is started；
2) low molecular weight amino resin alloy is modified:
E., when temperature is down to 40～50 DEG C, ammonia, high speed emulsifying 25～35min are added；
F. in 30～50min, add MUF preshrunk liquid, continue stirring 25～35min, obtain white or light gray emulsion.
In step, the proportioning of each raw material is as shown in table 1.
The mode being exerted into Aqueous Polyurethane Adhesives in described step (4) is: use steam atomization glue-applying technique, nozzle For wide mouth Fan-shaped Spray Atomizer, applying glue is shaped as Radix Rumicis cone, and glue system pressure is 13-15bar.
In described step (4), fiber after applying glue adds nano silicon as auxiliary agent when dry, and its addition is The 0.5%-1% of bone dry fiber quality.
Described step (4) is selected the percentage by weight of remover consist of: emulsified silicone oil 60%-70%, paraffin 10%- 20%, deionized water 10%-15%, emulsion adjuvant sodium alkyl benzene sulfonate 5%-10%, use as external release agent.
Compared to prior art, present invention have the advantage that
1) this product is real environment protecting and power-saving product, and burst size of methanal is " indoor well below GB18580-2001 Form aldehyde release limitation in decorating and renovating material wood-based plate and goods thereof " requirement, close to " zero " level, (wood material is certain Under humiture weather, self can discharge trace formaldehyde)；TVOC gas content reaches environmental standard HJ571-2010 " environmental mark Product certification technology requires wood-based plate and goods thereof " 0.5mg/ (m2*h) is claimed below.
2) this product is of many uses, has high moisture, can be used for exterior finish, uses under hot and humid environment, The weatherability of sheet material is good.The fibre board humidity resistance produced with tradition isocyanates is excellent, resin added control 60kg/m3 with Time upper, the requirement of outdoor moisture-proof based plate can be reached, and with the composite fiber plate of aqueous polyurethane production, reach at resin added During more than 100kg/m3, identical moisture-proof function can be reached, but cost to reduce about 8.5% than with isocyanates.
3) independent research aqueous polyurethane is used will not to produce human injury's during using as adhesive, resin Noxious substance, it is achieved green production, safety in production.
4) product primary raw material is agricultural industrial wood waste, is fabricated to what the alternative petroleum of composite fibre sheet material produced Composite board (PVC board), it is achieved resources effective utilization.
Accompanying drawing explanation
Fig. 1 is the production technological process of aqueous polyurethane heat cure composite fiber plate.
Detailed description of the invention
For the purpose of the present invention, technology character and superiority are more preferably described, it is specifically described by example in detail below.
Embodiment 1
A kind of aqueous polyurethane heat cure composite fiber plate, takes following steps to prepare:
(1) by long 40-60mm, wide 15-30mm, the clean sheet of log of thick 2-6mm is washed, and removes the silt on wood chip surface Deng impurity.Wood chip after washing is pumped into pre-cooked cylinder by wood chip, is simultaneously introduced sawdust and does inserts, and wherein sawdust adds Ratio be not more than the preferred 35%-50% of 50%(of inserts total amount, add sawdust and replace a part of wood chip and do raw material, play reduction The effect of energy consumption), carry out preliminarily softened, deliver to steaming and decocting in steaming and decocting cylinder by cork screw the most again, soften further.Steam Boiling the steam pressure in cylinder is 0.70-0.80MPa, digestion time 3-5 minute.
(2) chip steaming enters the mill room solution fibre of defibrator the most afterwards, accounts for bone dry fiber quality toward addition in mill room simultaneously The waterproofing agent of 1-1.5%.The pressure of mill room, less than the pressure about 0.01-0.02MPa of steaming and decocting cylinder, improves grinding of fiber by pressure reduction Mill quality.
(3) fiber applies to account for the Aqueous Polyurethane Adhesives of bone dry fiber quality 2-4%, the tool of Aqueous Polyurethane Adhesives Preparation step:
1) synthesis of hydrophilic polyurethane performed polymer:
A. in the reactor equipped equipped with mechanical agitation, nitrogen, temperature controller, constant pressure funnel, condensing reflux Add the polyether polyol (N220) of metering, polyether polyol (N330), toluene di-isocyanate(TDI) (TDI), diphenyl methane two Isocyanates (MDI), controlling reaction temperature is 50～60 DEG C；
B. 2 are added, 2-dihydromethyl propionic acid (DMPA), diglycol (DEG), it is incubated 1.5～2h；
C. it is warming up to 65～75 DEG C, adds triethylamine, dibutyl tin laurate, stir 10～20min, and be slowly added dropwise Diglycol (PAPI), drips complete in 1.5h；
D. every the concentration of 5～10min detection-NCO, when-NCO content is unchanged, adjustment and control system pH is 7.0～7.5, Add N-normal-butyl-3-aminopropyl trimethoxysilane (KH-558), after 10min, add double (trimethoxy is silica-based) the propyl group amine of N-N- (BTMSPA), cooling is started；
2) low molecular weight amino resin alloy is modified:
E., when temperature is down to 40～50 DEG C, ammonia, high speed emulsifying 25～35min are added；
F. in 30～50min, add MUF preshrunk liquid, continue stirring 25～35min, obtain white or light gray emulsion；
In step, each proportioning raw materials is as shown in table 1.
It is dried and keeps its moisture content (to add silicon dioxide when being dried as auxiliary agent, the elimination poly-ammonia of aqueous at about 8-12% The anisotropy of ester), enter mechanical forming machine and carry out mating formation molding.Entering hot press hot pressing through precompressed, continuous hot press selects Use minute surface steel band, use fan-shaped internal mix type shower nozzle that upper and lower steel strip surface is sprayed 1-2ml/m2The remover of left and right, i.e. adopts Outer ejection technique, slab hot pressing is used to become fibre board.
Comparative example 1
The formaldehyde-less fiber board that a kind of isocyanates manufactures, takes following steps to prepare:
(1) by long 40-60mm, wide 15-30mm, the clean sheet of log of thick 2-6mm is washed, and removes the silt on wood chip surface Deng impurity.Wood chip after washing is pumped into pre-cooked cylinder by wood chip and carries out preliminarily softened, is sent by cork screw the most again Steaming and decocting to steaming and decocting cylinder, softens further.Steam pressure in steaming and decocting cylinder is 0.70-0.80MPa, digestion time 3-5 minute.
(2), chip steaming enter the mill room of defibrator the most afterwards and solve fibre, simultaneously account for bone dry fiber quality toward addition in mill room The waterproofing agent of 1-1.5%.The pressure of mill room, less than the pressure about 0.01-0.02MPa of steaming and decocting cylinder, improves grinding of fiber by pressure reduction Mill quality.
(3), fiber apply the isocyanates gluing agent of 9-11% of bone dry fiber quality, be simultaneously introduced and isocyanates (E- MDI) inner pattern releasing agent applicable of isodose, is dried and keeps its moisture content at about 8.5-13%, and carry out mating formation molding.Enter through precompressed Hot press hot pressing, slab hot pressing becomes fibre board.
The fibre board that embodiment 1 aqueous polyurethane (WPU) and comparative example 1 isocyanates (E-MDI) are prepared is carried out physics and chemistry Performance evaluation is tested, and result is listed in table 2.Prepared fibre board carries out TVOC release detection, and result is listed in table 3.
Table 2 WPU and E-MDI fibre board physical and chemical index compares
Note: by the requirement of GB/T-11718-2009.
Note: by the requirement of HJ 571-2010.
The every physical and chemical index of the fibre board of embodiment 1 all reaches Standard as seen from Table 2, as seen from Table 3 The fibre board of embodiment 1 is compared with comparative example 1, and its every organic compound and TVOC burst size reach even much lower than GB and want Asking, this explanation has the premium properties of ultralow TVOC release according to the fibre board that preparation method of the present invention prepares, and is good The good special material of decoration is especially as automotive interior material.
The present invention breaks through the production technology of tradition isocyanates fibre board, ejection technique in replacing with outer ejection technique, weight Point is studied from the research and development of adhesive, and exploitation is suitable for the fibre board use adhesive aqueous polyurethane of ultralow TVOC release, simultaneously The use of raw material is chosen fresh poplar and sawdust does inserts, effectively reduce TVOC release, and the more traditional Carbimide. of cost The fibre board that ester produces is low by about 8.5%.

Claims (4)

1. the preparation method of an aqueous polyurethane heat cure composite fiber plate, it is characterised in that comprise the following steps:
(1) by long 40-60mm, wide 15-30mm, the clean sheet of log of thick 2-6mm is washed, and removes the impurity on wood chip surface；
(2) wood chip after washing is pumped into pre-cooked cylinder by wood chip, is simultaneously introduced sawdust composition inserts, carries out the softest Changing, the ratio that wherein sawdust adds is not more than the 50% of inserts total amount；Deliver to steam in steaming and decocting cylinder by cork screw the most again Boiling, soften further, the steam pressure in steaming and decocting cylinder is 0.70-0.80MPa, digestion time 3-5 minute；
(3) chip steaming enters the mill room solution fibre of defibrator the most afterwards, accounts for the 1-of bone dry fiber quality toward addition in mill room simultaneously The waterproofing agent of 1.5%；The pressure of mill room, less than the pressure 0.01-0.02MPa of steaming and decocting cylinder, improves the grinding matter of fiber by pressure reduction Amount；
(4) fiber after grinding applies to account for the Aqueous Polyurethane Adhesives of bone dry fiber quality 2-4%, is dried and keeps it aqueous Rate is at 8-13%, and carry out mating formation molding；Then hot press hot pressing is entered through precompressed, upper and lower steel strip surface to hot press during hot pressing Spray 1-2 ml/m2Remover, use outer ejection technique, slab uses the mode hot pressing of continuous flat to become fibre board；Heat Hot pressing temperature during pressure is 200-220 DEG C, hot pressing speed 10-15 s/mm, hot pressing pressure 2.0-5.0MPa；Described remover Percentage by weight consists of: emulsified silicone oil 60%-70%, paraffin 10%-20%, deionized water 10%-15%, emulsion adjuvant benzene sulfonamide Acid sodium 5%-10%；Described Aqueous Polyurethane Adhesives is pre-with cyanurotriamide modified urea resin by hydrophilic polyurethane performed polymer Being mixed with of contracting liquid forms, and concrete reactions steps is as follows:
1) synthesis of hydrophilic polyurethane performed polymer:
A. add in the reactor equipped equipped with mechanical agitation, nitrogen, temperature controller, constant pressure funnel, condensing reflux Polyether polyol N220 of metering, polyether polyol N330, toluene di-isocyanate(TDI) TDI, methyl diphenylene diisocyanate MDI, controlling reaction temperature is 50～60 DEG C；
B. 2 are added, 2-dihydromethyl propionic acid DMPA, diglycol DEG, it is incubated 1.5～2h；
C. it is warming up to 65～75 DEG C, adds triethylamine, dibutyl tin laurate, stir 10～20min, and be slowly added dropwise a contracting Diethylene glycol PAPI, drips complete in 1.5h；
D. every the concentration of 5～10min detection-NCO, when-NCO content is unchanged, adjustment and control system pH is 7.0～7.5, adds N-normal-butyl-3-aminopropyl trimethoxysilane KH-558, adds double (trimethoxy is silica-based) the propyl group amine of N-N-after 10min BTMSPA, starts cooling；
2) low molecular weight amino resin alloy is modified:
E., when temperature is down to 40～50 DEG C, ammonia, high speed emulsifying 25～35min are added；
F. in 30～50min, add cyanurotriamide modified urea resin preshrunk liquid, continue stirring 25～35min, obtain white Or light gray emulsion；
In step, each raw material is joined as follows:
The N220 8kg of weight percent content 99.5%；
The N330 4kg of weight percent content 99.5%；
The TDI 30kg of weight percent content 99.6%；
The MDI 20kg of weight percent content 99.6%；
The DEG 2kg of weight percent content 99.6%；
The DMPA 3kg of weight percent content 99.5%；
The dibutyl tin laurate 0.5kg of weight percent content 99 %；
The triethylamine 1kg of weight percent content 99.5%；
The PAPI 10kg of weight percent content 99.9%；
The BTMSPA 1kg of weight percent content 98%；
The KH-558 0.5kg of weight percent content 98%；
The cyanurotriamide modified urea resin preshrunk liquid 60kg of weight percent content 45%；
The ammonia 25kg of weight percent content 5%.
2., according to the preparation method of the aqueous polyurethane heat cure composite fiber plate described in claim 1, it is characterized in that: described Step (1) is selected fresh poplar brush wood carry out the clean sheet of prepared log of chipping.
3., according to the preparation method of the aqueous polyurethane heat cure composite fiber plate described in claim 1, it is characterized in that: described The mode being exerted into Aqueous Polyurethane Adhesives in step (4) is: use steam atomization glue-applying technique, and nozzle is wide mouth sector mist Changing nozzle, applying glue is shaped as Radix Rumicis cone, and glue system pressure is 13-15bar.
4., according to the preparation method of the aqueous polyurethane heat cure composite fiber plate described in claim 1, it is characterized in that: described In step (4), fiber after applying glue adds nano silicon as auxiliary agent when dry, and its addition is bone dry fiber quality 0.5%-1%.
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