CN108943202A - A kind of aldehyde-free by wood and preparation method thereof - Google Patents
A kind of aldehyde-free by wood and preparation method thereof Download PDFInfo
- Publication number
- CN108943202A CN108943202A CN201810841896.4A CN201810841896A CN108943202A CN 108943202 A CN108943202 A CN 108943202A CN 201810841896 A CN201810841896 A CN 201810841896A CN 108943202 A CN108943202 A CN 108943202A
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- China
- Prior art keywords
- veneer
- glued board
- hot
- polyethylene glycol
- pressing
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
- B27D1/083—Presses specially designed for making the manufacture of shaped plywood articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
The invention discloses a kind of aldehyde-free by wood and its manufacturing method, which is made of with veneer lignin-base adhesive, is prepared by hot pressing and cold pressing.The present invention is not required to add other adhesives or auxiliary material using lignin as adhesive, and Veneer gluing can be manufactured to the glued board at formaldehydeless burst size.Processing mode through the invention, the glue-joint strength of gained glued board be up to state standards as defined in II class glued board requirement, and there is no Form aldehyde release, can be used as the substrate of the ornament materials such as indoor wall, ground and furred ceiling, there is preferable prospects for commercial application.
Description
Technical field
The present invention relates to a kind of aldehyde-free by wood and preparation method thereof, in particular to it is a kind of by lignin as adhesive
The glued board and preparation method thereof of formaldehydeless release, belongs to wood working industry.
Background technique
Nearly more than ten years, China's wood-based plate industry are grown rapidly, and annual output is continuously increased.End to 2013, I
State's wood-based plate total output reaches 2.72 hundred million m3, especially glued board increase of production is more obvious, accounts for wood-based plate total output
57.8%.The development of wood-based plate considerably increases the demand to industrial adhesive, and annual demand is continuously improved.Currently, wooden
The industrial adhesive of material is still mainly with " three-aldehyde glue " three kinds of adhesives of Lauxite, phenolic resin and melamine resin
It is leading.This not only makes consumer have in face of endangering body because of the formaldehyde that wood-based plate gradually releases in use
The problem of heart health, and the dependence to fossil resource is also increased, cause the various problems such as in short supply and environmental pollution of resource.
Therefore, research and develop environmentally friendly timber industry adhesive seem very urgently with it is important.
Lignin is from a wealth of sources, cheap, and molecular structure belongs to three-dimensional crosslinking structure, and contains class phenol structure,
This special natural polymer minor structure provides possibility to prepare adhesive for wood.Many researchers are using lignin as glue
Glutinous agent prepares wood-based plate, and its physical property and mechanical property reach or much larger than respective country standard requirement.But it is existing
It is concentrated mainly on about by the research that adhesive prepares wood-based plate of lignin with different types of lignin and variety classes
Other adhesives compounding or it is modified prepare wood-based plate for raw material, and prepared for only using lignin itself as adhesive artificial
The exploitation of plate, especially glued board is relatively fewer, and corresponding research is then even more very few.Therefore, in order to preferably high-valued
Using lignin, the added value of its own is improved, and meets the needs of current wood industry market is to environmental protection type veneer board, compels to be essential
Develop a kind of glued board of formaldehydeless release.
Summary of the invention
Road syllabus of the invention be provide in view of the above problems it is a kind of using lignin as the formaldehydeless of adhesive
The preparation method of the environmental protection type veneer board of release.Glued board of the invention is not only environmentally protective, but also its mechanical property and physics
Performance can reach respective country standard requirements, be suitable for the Dicoration base material in the place such as indoor wall, ground, furred ceiling.
The present invention to solve problems of the prior art, and then proposes a kind of aldehyde-free by wood and its preparation
Method.
Further, the aldehyde-free by wood includes polyethylene glycol lignin adhesive layer, ply.
Wherein, the adhesive layer is the polyethylene glycol lignin using polyethylene glycol separation and Extraction from timber；It is described
Veneer with a thickness of 1mm-2mm, moisture content 5%-12%.
In particular, the molecular weight of the polyethylene glycol for separation and Extraction lignin is one of 600-6000 or more
Kind.
Further, the specific step of the aldehyde-free by wood is poly- as follows: Step 1: polyethylene glycol lignin adhesive is uniform
Ground is coated in veneer surface, forms glued board slab using criss-cross mode；Step 2: glued board slab is transferred to hot press
Middle carry out hot-pressing processing；Step 3: the glued board after hot pressing is transferred to cold pressing treatment in cold press immediately, it is glued to obtain no aldehyde
Plate.
Further, the resin added of the polyethylene glycol lignin adhesive of the step 1 is 300g/m2-450g/m2, table back
Layer veneer only applies one side, and internal layer veneer applies two sides.
Further, the slab number of plies that the criss-cross mode of the veneer of the step 1 forms is 3-7 layers.
Further, the hot pressing temperature in hot-pressing processing described in the step 2 is 100 DEG C -200 DEG C；Hot pressing time is
165s-975s；Hot pressing pressure is 1.0MPa-2.3MPa.
Further, the temperature of colding pressing in cold pressing treatment described in the step 3 is 15 DEG C -35 DEG C；Cold pressing the time be
5min-20min；Cold pressing pressure is 0.1MPa-1.0MPa.
Further, cold pressing program is transferred to after the discharge degrees such as glued board after the hot-pressing processing immediately, and guarantees to turn
The time for moving past journey is as short as possible.
The glued board that any preparation technology parameter of the method for the present invention is prepared is also within the scope of the present invention.
By many experiments, in conjunction with as a result, inventor's discovery in three steps, the resin added of lignin adhesive,
Hot pressing time, hot pressing temperature, cold pressing pressure are key factors.Different polyethylene glycol lignin adhesive resin addeds will affect two
The splicing degree of layer veneer, resin added hour, glued board can easily weaken glue-joint strength because glue is few；When resin added is big, then in list
There is more lignin adhesive in plate layer, since lignin itself is more crisp, also easy fracture；Hot pressing time in short-term, lignin
Adhesive cannot enter very well in the pore structure on veneer surface, cannot form glue pin structure well, when hot pressing time is long, then
The structure of veneer itself is destroyed；When hot pressing temperature is low, lignin adhesive cannot be melted preferably, will not well into
Enter veneer surface layer hole, preferable glue pin structure cannot be formed, when hot pressing temperature is high, to lignin adhesive molecular structure
It destroys, it is possible to create autohemagglutination increases molecular weight, is also not easily accessible veneer hole and cannot form preferable glue pin structure；Cold pressing
Pressure hour, the glued board after hot pressing are easy expansion, reduce splicing degree.
By controlling the above key factor, the mechanical property of resulting polyethylene glycol lignin adhesive glued board reaches
The requirements of the national standard of II class glued board.Therefore, the beneficial effects of the present invention are by using environmentally protective polyethylene glycol
Lignin is that adhesive prepares glued board, not only the glued board of available formaldehydeless release, but also realizes the height of lignin
Value utilizes, this provides important manufacturing method for the wood-based plate of preparation low cost, environment-friendly type；Also, method of the invention
It is easy to operate, it is less energy consumption, high-efficient, there is preferable prospects for commercial application.
Detailed description of the invention
Fig. 1 is the slab assembly schematic diagram of aldehyde-free by wood of the present invention.
Description of symbols
1, hot press heating plate；2, steel plate；3, staggered veneer；4, lignin adhesive.
Specific embodiment
Following embodiment further illustrates the contents of the present invention, but should not be construed as limiting the invention.Without departing substantially from
In the case where spirit of that invention and essence, to modifications or substitutions made by the method for the present invention, step or condition, the present invention is belonged to
Range.
Unless otherwise specified, the conventional means that technological means used in embodiment is well known to those skilled in the art,
In embodiment, each raw material of addition is commercially available conventional raw material unless otherwise indicated.
Embodiment 1
1, by poplar slicing at the veneer of 1.0mm, and adjusting Veneer moisture is 8%；
It 2, is 400g/m by resin added by polyethylene glycol lignin adhesive2Equably it is coated in board using poplar board surface (wherein,
Two veneer of table backboard only applies one side respectively), and three layers of poplar plywood slab are formed using criss-cross mode.In room temperature condition
Lower closure carries out hot-press gluing plate after displaying 20min；
3, man-made board hot-pressing machine is opened, hot-pressing processing is carried out to glued board slab, wherein hot pressing pressure is 1.8MPa, hot pressing
Temperature is 180 DEG C, hot pressing time 705s；
4, the glued board after hot pressing is taken out together with steel plate, is transferred in cold press immediately and carries out cold pressing treatment, wherein
The selected technological parameter of cold pressing is cold pressing pressure 0.6MPa, is cold-pressed time 15min, 30 DEG C of temperature of colding pressing；
5, the glued board after cold pressing treatment is taken out, stacks and places, carried out ripening, eliminate the stress of compound veneer,
Ripening 2h to get arrive aldehyde-free by wood.
Glue is measured referring to standard GB/T/T 17657-2013 " wood-based plate and face artificial board physicochemical property test method "
The power performance such as bonding strength, static bending strength, elasticity modulus of plywood, testing result are shown in Table 1.
Embodiment 2
1, by poplar slicing at the veneer of 1.0mm, and adjusting Veneer moisture is 8%；
It 2, is 420g/m by resin added by polyethylene glycol lignin adhesive2Equably it is coated in board using poplar board surface (wherein,
Two veneer of table backboard only applies one side respectively), and three layers of poplar plywood slab are formed using criss-cross mode.In room temperature condition
Lower closure carries out hot-press gluing plate after displaying 20min；
3, man-made board hot-pressing machine is opened, hot-pressing processing is carried out to glued board slab, wherein hot pressing pressure is 1.8MPa, hot pressing
Temperature is 200 DEG C, hot pressing time 705s；
4, the glued board after hot pressing is taken out together with steel plate, is transferred in cold press immediately and carries out cold pressing treatment, wherein
The selected technological parameter of cold pressing is cold pressing pressure 0.8MPa, is cold-pressed time 15min, 30 DEG C of temperature of colding pressing；
5, the glued board after cold pressing treatment is taken out, stacks and places, carried out ripening, eliminate the stress of compound veneer,
Ripening 2h to get arrive aldehyde-free by wood.
Glue is measured referring to standard GB/T/T 17657-2013 " wood-based plate and face artificial board physicochemical property test method "
The power performance such as bonding strength, static bending strength, elasticity modulus of plywood, testing result are shown in Table 1.
Embodiment 3
1, by poplar slicing at the veneer of 1.0mm, and adjusting Veneer moisture is 8%；
It 2, is 350g/m by resin added by polyethylene glycol lignin adhesive2Equably it is coated in board using poplar board surface (wherein,
Two veneer of table backboard only applies one side respectively), and three layers of poplar plywood slab are formed using criss-cross mode.In room temperature condition
Lower closure carries out hot-press gluing plate after displaying 20min；
3, man-made board hot-pressing machine is opened, hot-pressing processing is carried out to glued board slab, wherein hot pressing pressure is 1.8MPa, hot pressing
Temperature is 180 DEG C, hot pressing time 840s；
4, the glued board after hot pressing is taken out together with steel plate, is transferred in cold press immediately and carries out cold pressing treatment, wherein
The selected technological parameter of cold pressing is cold pressing pressure 0.5MPa, is cold-pressed time 10min, 30 DEG C of temperature of colding pressing；
5, the glued board after cold pressing treatment is taken out, stacks and places, carried out ripening, eliminate the stress of compound veneer,
Ripening 2h to get arrive aldehyde-free by wood.
Glue is measured referring to standard GB/T/T 17657-2013 " wood-based plate and face artificial board physicochemical property test method "
The power performance such as bonding strength, static bending strength, elasticity modulus of plywood, testing result are shown in Table 1.
Comparative example 1
1, by poplar slicing at the veneer of 1.0mm, and adjusting Veneer moisture is 8%；
2, polyethylene glycol lignin adhesive is mixed with urea-formaldehyde resin adhesive by 1:1, then pressing resin added is 380g/m2
It is equably coated in board using poplar board surface (wherein, two veneer of table backboard only applies one side respectively), and is formed using criss-cross mode
Three layers of poplar plywood slab.Closure carries out hot-press gluing plate after displaying 20min at room temperature；
3, man-made board hot-pressing machine is opened, hot-pressing processing is carried out to glued board slab, wherein hot pressing pressure is 1.6MPa, hot pressing
Temperature is 160 DEG C, hot pressing time 705s；
4, the glued board after hot pressing is taken out together with steel plate, is transferred in cold press immediately and carries out cold pressing treatment, wherein
The selected technological parameter of cold pressing is cold pressing pressure 1.0MPa, is cold-pressed time 20min, 30 DEG C of temperature of colding pressing；
5, the glued board after cold pressing treatment is taken out, stacks and places, carried out ripening, eliminate the stress of compound veneer,
Ripening 2h to get arrive aldehyde-free by wood.
Glue is measured referring to standard GB/T/T 17657-2013 " wood-based plate and face artificial board physicochemical property test method "
The power performance such as bonding strength, static bending strength, elasticity modulus of plywood, testing result are shown in Table 1.
1 glued board mechanical experimental results of table
Comparing embodiment 1,2,3 and comparative example 1, the glued board for using polyethylene glycol lignin to be prepared for adhesive is not
With Form aldehyde release, and bonding strength has reached II class requirement in national standard；Meanwhile with the glue containing urea-formaldehyde resin adhesive
Plywood is compared, and part glued board all shows good static bending strength and elasticity modulus in the present invention.Therefore, the technology of this patent
It is compared to previous preparation method, more environmentally protective, application value with higher.
The above is only that a specific embodiment of the invention is described, and is not intended to limit the scope of the present invention,
It should be pointed out that for those skilled in the art, without departing from the technical principles of the invention, existing
Several improvements and modifications can also be made on the basis of technology by having, these improvements and modifications should all should be regarded as right of the invention and want
In the protection scope for asking book to determine.
Claims (9)
1. a kind of aldehyde-free by wood, including polyethylene glycol lignin adhesive layer, ply.
2. glued board as described in claim 1, it is characterized in that the adhesive layer is separated from timber using polyethylene glycol
The polyethylene glycol lignin of extraction；The veneer with a thickness of 1mm-2mm, moisture content 5%-12%.
3. being as claimed in claim 2 one of 600-6000 for the molecular weight of the polyethylene glycol of separation and Extraction lignin
Or it is a variety of.
4. the specific step of aldehyde-free by wood as claimed in claim 1 is poly- as follows:
(1) polyethylene glycol lignin adhesive is equably coated in veneer surface, glued board plate is formed using criss-cross mode
Base；
(2) glued board slab is transferred in hot press and carries out hot-pressing processing；
(3) glued board after hot pressing is transferred to cold pressing treatment in cold press immediately.
5. the preparation method according to claim 4, which is characterized in that the polyethylene glycol lignin adhesive of step (1)
Resin added is 300g/m2-450g/m2, table backing layer veneer only apply one side, internal layer veneer apply two sides.
6. the preparation method according to claim 4, which is characterized in that the criss-cross mode of veneer of step (1) formed
The slab number of plies is 3-7 layers.
7. the preparation method according to claim 4, which is characterized in that the hot pressing temperature in hot-pressing processing described in step (2)
Degree is 100 DEG C -200 DEG C；Hot pressing time is 165s-975s；Hot pressing pressure is 1.0MPa-2.3MPa.
8. the preparation method according to claim 4, which is characterized in that the cold pressing temperature in cold pressing treatment described in step (3)
Degree is 15 DEG C -35 DEG C；The cold pressing time is 5min-20min；Cold pressing pressure is 0.1MPa-1.0MPa.
9. the polyethylene glycol lignin adhesive glued board that any the method for claim 1-8 is prepared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841896.4A CN108943202A (en) | 2018-07-27 | 2018-07-27 | A kind of aldehyde-free by wood and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841896.4A CN108943202A (en) | 2018-07-27 | 2018-07-27 | A kind of aldehyde-free by wood and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108943202A true CN108943202A (en) | 2018-12-07 |
Family
ID=64465808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810841896.4A Pending CN108943202A (en) | 2018-07-27 | 2018-07-27 | A kind of aldehyde-free by wood and preparation method thereof |
Country Status (1)
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|---|---|
| CN (1) | CN108943202A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112025872A (en) * | 2020-09-17 | 2020-12-04 | 广西龙酉商贸有限公司 | Formaldehyde-free environment-friendly flame-retardant plywood and manufacturing method thereof |
-
2018
- 2018-07-27 CN CN201810841896.4A patent/CN108943202A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112025872A (en) * | 2020-09-17 | 2020-12-04 | 广西龙酉商贸有限公司 | Formaldehyde-free environment-friendly flame-retardant plywood and manufacturing method thereof |
| CN112025872B (en) * | 2020-09-17 | 2021-07-02 | 贵港市俊鑫木业有限公司 | Formaldehyde-free environment-friendly flame-retardant plywood and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181207 |
|
| WD01 | Invention patent application deemed withdrawn after publication |