CN104290168A - Manufacturing method for thermosetting waterborne polyurethane composite fiberboard - Google Patents
Manufacturing method for thermosetting waterborne polyurethane composite fiberboard Download PDFInfo
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- CN104290168A CN104290168A CN201410402943.7A CN201410402943A CN104290168A CN 104290168 A CN104290168 A CN 104290168A CN 201410402943 A CN201410402943 A CN 201410402943A CN 104290168 A CN104290168 A CN 104290168A
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- aqueous polyurethane
- fiberboard
- waterborne polyurethane
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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
The invention relates to a manufacturing method for a thermosetting waterborne polyurethane composite fiberboard. The manufacturing method comprises the steps that fresh poplar pieces are selected as main raw materials, and saw powder is added to replace part of poplar pieces to serve as raw materials; the polar pieces and the saw powder are subjected to pre-digesting, digesting and hot mill de-fiberization, and waterborne polyurethane is applied to be adhesive; in the drying process, nanometer silica is added to serve as an addition agent, after being sorted, laid and formed, the polar pieces and the saw powder enter a continuous flat press to be pressed, and then the thermosetting waterborne polyurethane composite fiberboard can be manufactured. The formaldehyde emission of the manufactured thermosetting waterborne polyurethane composite fiberboard is far lower than the formaldehyde emission which is regulated in the requirement of GB18580-2001 formaldehyde emission limit in interior decoration material artificial boards and products of the artificial boards, and the formaldehyde emission is near zero; the TVOC gas content meets the environmental standard HJ571-2010 environmental labeling product certification technical requirements that the TVOC gas content of artificial boards and products of the artificial boards is lower than 0.5 mg/ (m<2>*h); When the amount of applied adhesive reaches 100 kg/m<3> or more, the thermosetting waterborne polyurethane composite fiberboard can achieve the same moisture-proof function as a fiberboard manufactured traditionally through isocyanate, but the cost of the thermosetting waterborne polyurethane composite fiberboard is reduced by about 8.5 percent compared with the fiberboard manufactured through isocyanate.
Description
Technical field
The invention belongs to Wood-based Panel Production technical field, is a kind of novel environment friendly decoration type sheet material technique, the preparation method of the aqueous polyurethane heat cure composite fiber plate of particularly a kind of ultralow TVOC release.
Background technology
As the wood-based plate of Dicoration base material, the pollution of free formaldehyde is known by people, and the organic volatile of other types is usually ignored by people.TVOC is the general name of VOC, and its composition is extremely complicated, and common have formaldehyde, benzene, dimethylbenzene, ammonia, chloroform, naphthalene, diisocyanates etc., is the arch-criminal of indoor decoration pollution.TVOC has tremendous influence to human-body safety health: when the TVOC in room reaches finite concentration, in short time, people can feel headache, Nausea and vomiting, weak etc., if leave scene not in time, can twitch time serious, go into a coma, failure of memory, the liver of harm people, kidney, brain and nervous 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 find that baking temperature and whole moisture content affect larger on VOC burst size, thus have scholar to be optimized timber drying, its VOC of obtained wood-based plate release decreases; Some scholar's research find that doing surface treatment to wood-based plate also reduces VOC burst size simultaneously; In addition the change of many scholars (as Douglas, Wang) research discovery hot pressing temperature, hot pressing time, glue kind, seeds discharges the impact had in various degree on wood-based plate VOC; Document " in car compartment, VOC inquires into and adhesive solve scheme " emphasis inquires into the solve scheme of the adhesive reducing the indoor VOC release of car from material.
Summary of the invention
The invention provides that a kind of production. art is simple, what be easy to control take wood fibre as raw material, applies the method that aqueous polyurethane produces the aqueous polyurethane heat cure composite fiber plate that ultralow TVOC discharges, and effectively reduce TVOC release by the utilization of external release agent technology, and the fiberboard that the more traditional isocyanates of cost is produced is low by about 8.5%.
To achieve these goals, technical scheme of the present invention comprises the following steps:
(1) by long 40-60mm, the clean sheet of log of wide 15-30mm, thick 2-6mm is washed, the impurity on removing wood chip surface;
(2) wood chip after washing is by wood chip transport pump to pre-cooked cylinder, and add sawdust composition inserts, carry out preliminarily softened, the ratio that wherein sawdust adds is not more than 50% of inserts total amount simultaneously; And then deliver to boiling in boiling cylinder by cork screw, soften further, the steam pressure in boiling cylinder is 0.70-0.80MPa, digestion time 3-5 minute;
(3) chip steaming fully after enter defibrator mill room separate fine, simultaneously toward grinding the waterproofing agent adding the 1-1.5% accounting for bone dry fiber quality in room; The pressure of mill room, lower than the pressure 0.01-0.02MPa of boiling cylinder, improves the Grinding Quality of fiber by pressure reduction;
(4) fiber after grinding applies to account for the Aqueous Polyurethane Adhesives of bone dry fiber quality 2-4%, dryly also keeps its moisture content at 8-13%, carries out mating formation shaping; Then enter hot press hot pressing through precompressed, during hot pressing, 1-2 ml/m is sprayed to the upper and lower steel strip surface of hot press
2remover, adopt outer ejection technique, slab adopts the mode hot pressing of continuous flat to become fiberboard; 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 better technique effect, such scheme more preferably:
Fresh poplar brush wood is selected to carry out obtained log sheet of chipping in described step (1).
In described step (4), Aqueous Polyurethane Adhesives is preferably formed by Waterborne Polyurethane Prepolymer and being mixed with of cyanurotriamide modified urea resin preshrunk liquid, concrete reactions steps:
1) synthesis of hydrophilic polyurethane performed polymer:
A. in the reactor that mechanical agitation, nitrogen, temperature controller, constant pressure funnel, condensing reflux equipment are housed, add PPG (N220), PPG (N330), toluene di-isocyanate(TDI) (TDI), the methyl diphenylene diisocyanate (MDI) of metering, controlling reaction temperature is 50 ~ 60 DEG C;
B. 2,2-dihydromethyl propionic acid (DMPA), diglycol (DEG) is added, insulation 1.5 ~ 2h;
C. be warming up to 65 ~ 75 DEG C, add triethylamine, dibutyl tin laurate, stir 10 ~ 20min, and slowly drip diglycol (PAPI), dropwise in 1.5h;
D. the concentration of-NCO is detected every 5 ~ 10min, when-NCO content is unchanged, adjustment and control system pH is 7.0 ~ 7.5, add N-normal-butyl-3-aminopropyl trimethoxysilane (KH-558), add two (trimethoxy is silica-based) propyl group amine (BTMSPA) of N-N-after 10min, start cooling;
2) low molecular weight amino resin alloy modification:
E. when temperature is down to 40 ~ 50 DEG C, ammoniacal liquor is added, emulsify at a high speed 25 ~ 35min;
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: adopt steam atomization glue-applying technique, nozzle is wide mouth Fan-shaped Spray Atomizer, and applying glue shape is that wide-angle is conical, and glue system pressure is 13-15bar.
Fiber in described step (4) after applying glue adds nano silicon as auxiliary agent when drying, and its addition is the 0.5%-1% of bone dry fiber quality.
Select the percentage by weight of remover to consist of in described step (4): silicone emulsion 60%-70%, paraffin 10%-20%, deionized water 10%-15%, emulsion adjuvant sodium alkyl benzene sulfonate 5%-10%, uses as external release agent.
Compared to prior art, the present invention has following advantage:
1) this product is real environment protecting and power-saving product, burst size of methanal is well below GB18580-2001 " in indoor decorating and refurnishing materials wood-based plate and goods thereof Form aldehyde release limitation " requirement, close to " zero " level (under certain humiture weather, self can discharge trace formaldehyde to wood material); TVOC gas content reaches environmental standard HJ571-2010 " environmental labelling product authentication techniques require wood-based plate and goods thereof " 0.5mg/ (m2*h) following requirement.
2) this product is of many uses, has high moisture, can be used for exterior finish, uses under hot and humid environment, and the weatherability of sheet material is good.The fiberboard humidity resistance of producing with traditional isocyanates is excellent, resin added controls when more than 60kg/m3, the requirement of outdoor moisture-proof based plate can be reached, and the composite fiber plate of use polyurethane production, when resin added reaches more than 100kg/m3, can reach identical moisture-proof function, but cost ratio isocyanates to reduce about 8.5%.
3) use independent research aqueous polyurethane as adhesive, the noxious material to human injury in resin use procedure, can not be produced, realize green production, safety in production.
4) product primary raw material is agricultural industrial wood waste, is made into the composite board (PVC board) that the alternative petroleum of composite fibre sheet material is produced, realizes 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 object of the present invention, technology character and superiority are better described, be specifically described by following instantiation.
Embodiment 1
A kind of aqueous polyurethane heat cure composite fiber plate, take following steps to prepare:
(1) impurity such as by long 40-60mm, the clean sheet of log of wide 15-30mm, thick 2-6mm is washed, the silt on removing wood chip surface.Wood chip after washing passes through wood chip transport pump to pre-cooked cylinder, add sawdust simultaneously and do inserts, the ratio that wherein sawdust adds is not more than the preferred 35%-50% of 50%(of inserts total amount, add sawdust to replace a part of wood chip and do raw material, play the effect reducing energy consumption), carry out preliminarily softened, and then deliver to boiling in boiling cylinder by cork screw, soften further.Steam pressure in boiling cylinder is 0.70-0.80MPa, digestion time 3-5 minute.
(2) chip steaming fully after enter defibrator mill room separate fine, add toward grinding in room the waterproofing agent accounting for bone dry fiber quality 1-1.5% simultaneously.The pressure of mill room is about 0.01-0.02MPa lower than the pressure of boiling cylinder, is improved the Grinding Quality of fiber by pressure reduction.
(3) fiber applies the Aqueous Polyurethane Adhesives accounting for bone dry fiber quality 2-4%, the concrete preparation process of Aqueous Polyurethane Adhesives:
1) synthesis of hydrophilic polyurethane performed polymer:
A. in the reactor that mechanical agitation, nitrogen, temperature controller, constant pressure funnel, condensing reflux equipment are housed, add PPG (N220), PPG (N330), toluene di-isocyanate(TDI) (TDI), the methyl diphenylene diisocyanate (MDI) of metering, controlling reaction temperature is 50 ~ 60 DEG C;
B. 2,2-dihydromethyl propionic acid (DMPA), diglycol (DEG) is added, insulation 1.5 ~ 2h;
C. be warming up to 65 ~ 75 DEG C, add triethylamine, dibutyl tin laurate, stir 10 ~ 20min, and slowly drip diglycol (PAPI), dropwise in 1.5h;
D. the concentration of-NCO is detected every 5 ~ 10min, when-NCO content is unchanged, adjustment and control system pH is 7.0 ~ 7.5, add N-normal-butyl-3-aminopropyl trimethoxysilane (KH-558), add two (trimethoxy is silica-based) propyl group amine (BTMSPA) of N-N-after 10min, start cooling;
2) low molecular weight amino resin alloy modification:
E. when temperature is down to 40 ~ 50 DEG C, ammoniacal liquor is added, emulsify at a high speed 25 ~ 35min;
F. in 30 ~ 50min, add MUF preshrunk liquid, continue stirring 25 ~ 35min, obtain white or light gray emulsion;
In step, each pulp furnish is as shown in table 1.
Dry its moisture content that also keeps, at about 8-12% (add silica as auxiliary agent time dry, eliminate the anisotropy of aqueous polyurethane), enters mechanical forming machine and carries out mating formation shaping.Enter hot press hot pressing through precompressed, continuous hot press selects minute surface steel band, adopts fan-shaped internal mix type shower nozzle to spray 1-2ml/m to upper and lower steel strip surface
2the remover of left and right, namely adopt outer ejection technique, slab hot pressing becomes fiberboard.
Comparative example 1
The formaldehyde-less fiber board that isocyanates manufactures, take following steps to prepare:
(1) impurity such as by long 40-60mm, the clean sheet of log of wide 15-30mm, thick 2-6mm is washed, the silt on removing wood chip surface.Wood chip after washing carries out preliminarily softened by wood chip transport pump to pre-cooked cylinder, and then delivers to boiling in boiling cylinder by cork screw, softens further.Steam pressure in boiling cylinder is 0.70-0.80MPa, digestion time 3-5 minute.
(2), chip steaming fully after enter defibrator mill room separate fine, add toward grinding in room the waterproofing agent accounting for bone dry fiber quality 1-1.5% simultaneously.The pressure of mill room is about 0.01-0.02MPa lower than the pressure of boiling cylinder, is improved the Grinding Quality of fiber by pressure reduction.
(3), fiber applies the isocyanates gluing agent of the 9-11% of bone dry fiber quality, adds the inner pattern releasing agent applicable with isocyanates (E-MDI) isodose simultaneously, dryly also keeps its moisture content at about 8.5-13%, carries out mating formation shaping.Enter hot press hot pressing through precompressed, slab hot pressing becomes fiberboard.
Physicochemical property evaluation test is carried out to embodiment 1 aqueous polyurethane (WPU) and the obtained fiberboard of comparative example 1 isocyanates (E-MDI), the results are shown in table 2.Carry out TVOC release to obtained fiberboard to detect, the results are shown in table 3.
Table 2 WPU and E-MDI fiberboard physical and chemical index compare
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 fiberboard of embodiment 1 all reaches Standard as seen from Table 2, the fiberboard of embodiment 1 is compared with comparative example 1 as seen from Table 3, its every organic compound and TVOC burst size reach even far below Standard, this illustrates that the fiberboard obtained according to preparation method of the present invention has the premium properties of ultralow TVOC release, is that the good special material of decoration is especially used as automotive interior material.
The present invention breaks through the production technology of traditional isocyanates fiberboard, ejection technique in replacing with outer ejection technique, emphasis is studied from the research and development of adhesive, exploitation is applicable to the fibre board use adhesive-aqueous polyurethane of ultralow TVOC release, simultaneously in the use of raw material, choose fresh poplar and sawdust does inserts, effectively reduce TVOC release, and the fiberboard that the more traditional isocyanates of cost is produced is low by about 8.5%.
Claims (6)
1. a preparation method for aqueous polyurethane heat cure composite fiber plate, is characterized in that, comprises the following steps:
(1) by long 40-60mm, the clean sheet of log of wide 15-30mm, thick 2-6mm is washed, the impurity on removing wood chip surface;
(2) wood chip after washing is by wood chip transport pump to pre-cooked cylinder, and add sawdust composition inserts, carry out preliminarily softened, the ratio that wherein sawdust adds is not more than 50% of inserts total amount simultaneously; And then deliver to boiling in boiling cylinder by cork screw, soften further, the steam pressure in boiling cylinder is 0.70-0.80MPa, digestion time 3-5 minute;
(3) chip steaming fully after enter defibrator mill room separate fine, simultaneously toward grinding the waterproofing agent adding the 1-1.5% accounting for bone dry fiber quality in room; The pressure of mill room, lower than the pressure 0.01-0.02MPa of boiling cylinder, improves the Grinding Quality of fiber by pressure reduction;
(4) fiber after grinding applies to account for the Aqueous Polyurethane Adhesives of bone dry fiber quality 2-4%, dryly also keeps its moisture content at 8-13%, carries out mating formation shaping; Then enter hot press hot pressing through precompressed, during hot pressing, 1-2 ml/m is sprayed to the upper and lower steel strip surface of hot press
2remover, adopt outer ejection technique, slab adopts the mode hot pressing of continuous flat to become fiberboard; 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.
2. according to the aqueous polyurethane heat cure composite fiber plate preparation method described in claim 1, it is characterized in that: in described step (1), select fresh poplar brush wood to carry out obtained log sheet of chipping.
3. according to the aqueous polyurethane heat cure composite fiber plate preparation method described in claim 1 or 2, it is characterized in that: described Aqueous Polyurethane Adhesives is formed by Waterborne Polyurethane Prepolymer and being mixed with of cyanurotriamide modified urea resin preshrunk liquid, and concrete reactions steps is as follows:
1) synthesis of hydrophilic polyurethane performed polymer:
A. in the reactor that mechanical agitation, nitrogen, temperature controller, constant pressure funnel, condensing reflux equipment are housed, add PPG N220, PPG N330, toluene di-isocyanate(TDI) TDI, the methyl diphenylene diisocyanate MDI of metering, controlling reaction temperature is 50 ~ 60 DEG C;
B. 2,2-dihydromethyl propionic acid DMPA, diglycol DEG is added, insulation 1.5 ~ 2h;
C. be warming up to 65 ~ 75 DEG C, add triethylamine, dibutyl tin laurate, stir 10 ~ 20min, and slowly drip diglycol PAPI, dropwise in 1.5h;
D. the concentration of-NCO is detected every 5 ~ 10min, when-NCO content is unchanged, adjustment and control system pH is 7.0 ~ 7.5, adds N-normal-butyl-3-aminopropyl trimethoxysilane KH-558, add two (trimethoxy is silica-based) propyl group amine BTMSPA of N-N-after 10min, start cooling;
2) low molecular weight amino resin alloy modification:
E. when temperature is down to 40 ~ 50 DEG C, ammoniacal liquor is added, emulsify at a high speed 25 ~ 35min;
F. in 30 ~ 50min, add MUF preshrunk liquid, continue stirring 25 ~ 35min, obtain white or light gray emulsion; In step, each pulp furnish is as shown in table 1:
。
4. according to the aqueous polyurethane heat cure composite fiber plate preparation method described in claim 3, it is characterized in that: the mode being exerted into Aqueous Polyurethane Adhesives in described step (4) is: adopt steam atomization glue-applying technique, nozzle is wide mouth Fan-shaped Spray Atomizer, applying glue shape is that wide-angle is conical, and glue system pressure is 13-15bar.
5. according to the aqueous polyurethane heat cure composite fiber plate preparation method described in claim 4, it is characterized in that: the fiber in described step (4) after applying glue adds nano silicon as auxiliary agent when drying, and its addition is the 0.5%-1% of bone dry fiber quality.
6. according to the aqueous polyurethane heat cure composite fiber plate preparation method described in claim 5, it is characterized in that: select the percentage by weight of remover to consist of in described step (4): silicone emulsion 60%-70%, paraffin 10%-20%, deionized water 10%-15%, emulsion adjuvant sodium alkyl benzene sulfonate 5%-10%.
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| CN106584636A (en) * | 2016-11-23 | 2017-04-26 | 兰州科天环保节能科技有限公司 | Production technique for formaldehyde-free damp-proof high-density fiberboard |
| CN106671242A (en) * | 2016-12-21 | 2017-05-17 | 兰州科天环保节能科技有限公司 | Zero-formaldehyde shaving board and manufacturing method thereof |
| CN108818872A (en) * | 2018-05-24 | 2018-11-16 | 贵州益寿农业科技有限公司 | A method of utilizing Camellia Leaves making artificial plate |
| CN109096967A (en) * | 2018-06-28 | 2018-12-28 | 广西丰林木业集团股份有限公司 | A kind of preparation method of composite modified gluing agent and the manufacturing method of anti-wet fiber plate |
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