CN101229647A - Method of using additive containing lignin to prepare cottonwood plank stuff - Google Patents
Method of using additive containing lignin to prepare cottonwood plank stuff Download PDFInfo
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- CN101229647A CN101229647A CNA2008100202934A CN200810020293A CN101229647A CN 101229647 A CN101229647 A CN 101229647A CN A2008100202934 A CNA2008100202934 A CN A2008100202934A CN 200810020293 A CN200810020293 A CN 200810020293A CN 101229647 A CN101229647 A CN 101229647A
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Abstract
The invention relates to a method of preparing polar planks with additive containing lignin. Material preparation comprises the following steps: mixed solution of lignin solution and formaldehyde solution is prepared; liquor immersion of slabs is carried out: the prepared polar slabs are immersed in a sealed tank with the mixed solution of lignin and formaldehyde for vacuum treatment; the slabs are compressed: the obtained polar slabs are then placed in a hot press provided with a steam generating device for hot pressing; post treatment of slabs is carried out: the slabs after treated through the former steps are then piled up for 14 days and then made into polar compression planks. By adopting the method, the dimensional stability of the compression planks is greatly improved; the production technique is simple and the product performance index can achieve the performance index of the domestic like products. Meanwhile, the planks produced by the method of the invention have better dimensional stability under the precondition of good physical and mechanical property and produce no free formaldehyde.
Description
One, technical field
The invention belongs to wood-based plate and make field, particularly a kind of preparation method of cottonwood plank stuff.
Two, background technology
Prior art: willow is one of main quick-growing plantation seeds of China, its material exist wooden soft, density is little, hardness is little, intensity is low, defective such as apt to rot, has limited its scope of application.Timber is carried out band compression, can make that material is light and soft, density is lower, the timber of process industrial art performance difference is improving aspect physics, the mechanical property.But the major defect of the timber after overcompression is the size instability, it is immersed in water, or be placed on and absorb moisture in the air, will recover original size gradually.The normal both at home and abroad at present fixing method of compression wood distortion that adopts is to the inner chemical agents such as phenolic resins, Lauxite that inject of timber.There are many weak points in these methods, wherein the most important thing is to contain in the resin harmful free formaldehyde.
Lignin is a kind of natural high polymer that is deposited in the plant cell wall, is one of main matter that constitutes wood cell wall, and it plays hard solid effect in cell membrane.If lignin can be injected the quick growth poplar wood staypak as additive, just can obtain modification staypak with natural quick growth poplar wood processing, not only can under the precondition that guarantees the good physical mechanical property, have dimensional stability preferably, and can not produce the problem of free formaldehyde, therefore, seeking suitable processing method, is a kind of new way that obtains novel poplar staypak.
Three, summary of the invention
The present invention is directed to above-mentioned technical problem, a kind of method of utilizing additive containing lignin to prepare cottonwood plank stuff is provided, the sheet material that this method produces has dimensional stability preferably under the precondition that guarantees the good physical mechanical property, and can not produce the problem of free formaldehyde.
Technical solution of the present invention is: a kind of method of utilizing additive containing lignin to prepare cottonwood plank stuff, preparation process is as follows: a kind of method of utilizing additive containing lignin to prepare cottonwood plank stuff, it is characterized in that preparation process is: raw material is prepared: choose the poplar slab, the mixed solution of preparation lignin solution and formalin; Slab impregnation process: ready poplar slab is immersed application of vacuum in the hermetically sealed can that fills lignin formaldehyde hybrid infusion solution; Slab compacting: will go up poplar slab after the step impregnation process and put into the hot press hot-pressing processing and get cottonwood plank stuff.The dried moisture content of the gas of poplar slab is 9%～12%.Consisting of of the mixed solution of lignin solution and formalin: the mass percent concentration 5～10% of Lignosite, formaldehyde mass percent concentration 1%, adjust pH is to neutral.The method of slab impregnation process is: the first step: transferring the vacuum of hermetically sealed can is 0.08～0.09, keeps 2 hours; Second step: hermetically sealed can is warmed up to 85～95 ℃ under an atmospheric pressure, kept 1 hour; The 3rd step: to hermetically sealed can pressure heat-preserving 5 hours, pressure 0.4～0.5MPa, 85～95 ℃ of temperature; The 4th step: take out the poplar slab after the release.
The invention has the beneficial effects as follows: significantly improved the dimensional stability of staypak, and production technology is simple, the performance indications of product can reach the performance indications of domestic like product.The sheet material that this method produces has dimensional stability preferably under the precondition that guarantees the good physical mechanical property, and can not produce the problem of free formaldehyde.
Four, the specific embodiment
Embodiment 1:
Utilize the method for additive containing lignin to prepare cottonwood plank stuff, preparation process is:
A. raw material is prepared: choose the poplar slab, and the mixed solution of two kinds of prescriptions of preparation, prescription one: the mixed solution of lignin solution and formalin, prescription two is: the mixed solution of lignin solution and furfural solution;
B. slab impregnation process: ready poplar slab is immersed application of vacuum in the hermetically sealed can of the hybrid infusion solution that fills two kinds of prescriptions respectively;
C. slab compacting: will go up poplar slab after the step impregnation process and put into the hot press hot-pressing processing and get cottonwood plank stuff.
The dried moisture content of the gas of poplar slab is 9%%.The mixed solution of two kinds of prescriptions of step a preparation.Wherein, prescription one is: the mixed solution of lignin solution and formalin, wherein consisting of of mixed solution: the mass percent concentration 5% of Lignosite, formaldehyde mass percent concentration 1%, and adjust pH is to neutral; Prescription two is: the mixed solution of lignin solution and furfural solution, wherein consisting of of mixed solution: the mass percent concentration 5% of Lignosite, furfural mass percent concentration 2%, adjust pH is to neutral.The processing method of step b is: the first step: transferring the vacuum of hermetically sealed can is 0.08, keeps 2 hours; Second step: hermetically sealed can is warmed up to 85 ℃ under an atmospheric pressure, kept 1 hour; The 3rd step: to hermetically sealed can pressure heat-preserving 5 hours, pressure 0.4MPa, 85 ℃ of temperature; The 4th step: take out the poplar slab after the release.
Embodiment 2:
Utilize the method for additive containing lignin to prepare cottonwood plank stuff, preparation process is:
C. raw material is prepared: choose the poplar slab, and the mixed solution of two kinds of prescriptions of preparation, prescription one: the mixed solution of lignin solution and formalin, prescription two is: the mixed solution of lignin solution and furfural solution;
D. slab impregnation process: ready poplar slab is immersed application of vacuum in the hermetically sealed can of the hybrid infusion solution that fills two kinds of prescriptions respectively;
C. slab compacting: will go up poplar slab after the step impregnation process and put into the hot press hot-pressing processing and get cottonwood plank stuff.
The dried moisture content of the gas of poplar slab is 10%.The mixed solution of two kinds of prescriptions of step a preparation.Wherein, prescription one is: the mixed solution of lignin solution and formalin, wherein consisting of of mixed solution: the mass percent concentration 8% of Lignosite, formaldehyde mass percent concentration 1%, and adjust pH is to neutral; Prescription two is: the mixed solution of lignin solution and furfural solution, wherein consisting of of mixed solution: the mass percent concentration 8% of Lignosite, furfural mass percent concentration 2%, adjust pH is to neutral.The processing method of step b is: the first step: transferring the vacuum of hermetically sealed can is 0.085, keeps 2 hours; Second step: hermetically sealed can is warmed up to 90 ℃ under an atmospheric pressure, kept 1 hour; The 3rd step: to hermetically sealed can pressure heat-preserving 5 hours, pressure 0.45MPa, 90 ℃ of temperature; The 4th step: take out the poplar slab after the release.
Embodiment 3
Utilize the method for additive containing lignin to prepare cottonwood plank stuff, preparation process is:
E. raw material is prepared: choose the poplar slab, and the mixed solution of two kinds of prescriptions of preparation, prescription one: the mixed solution of lignin solution and formalin, prescription two is: the mixed solution of lignin solution and furfural solution;
F. slab impregnation process: ready poplar slab is immersed application of vacuum in the hermetically sealed can of the hybrid infusion solution that fills two kinds of prescriptions respectively;
C. slab compacting: will go up poplar slab after the step impregnation process and put into the hot press hot-pressing processing and get cottonwood plank stuff.
The dried moisture content of the gas of poplar slab is 12%.The mixed solution of two kinds of prescriptions of step a preparation.Wherein, prescription one is: the mixed solution of lignin solution and formalin, wherein consisting of of mixed solution: the mass percent concentration 10% of Lignosite, formaldehyde mass percent concentration 1%, and adjust pH is to neutral; Prescription two is: the mixed solution of lignin solution and furfural solution, wherein consisting of of mixed solution: the mass percent concentration 10% of Lignosite, furfural mass percent concentration 2%, adjust pH is to neutral.The processing method of step b is: the first step: transferring the vacuum of hermetically sealed can is 0.09, keeps 2 hours; Second step: hermetically sealed can is warmed up to 95 ℃ under an atmospheric pressure, kept 1 hour; The 3rd step: to hermetically sealed can pressure heat-preserving 5 hours, pressure 0.5MPa, 95 ℃ of temperature; The 4th step: take out the poplar slab after the release.
Embodiment 4:
Processing step one: according to high-temperature steam press size breadth and later stage performance test aspect consideration, the cottonwood plank stuff length that should select is 360mm～400mm; Width 100mm; 130mm; Thickness 21mm, sheet material do not have defectives such as knot and random line.The dried moisture content of gas of adjusting timber is 9%～12%.The mixed solution of two kinds of prescriptions of preparation, prescription one is: the mixed solution of lignin solution and formalin, wherein consisting of of mixed solution: the mass percent concentration 5～10% of Lignosite, formaldehyde mass percent concentration 1%, adjust pH is to neutral; Prescription two is: the mixed solution of lignin solution and furfural solution, wherein consisting of of mixed solution: the mass percent concentration 5～10% of Lignosite, furfural mass percent concentration 2%, adjust pH is to neutral.
Processing step two: impregnation process is that cottonwood plank stuff is put into the encapsulation process jar, it is carried out impregnation process, for improving the absorption of poplar to lignin, make cottonwood plank stuff can under the condition of HTHP, absorb lignin fully, equably, employing vacuumizes processing, getting vacuum is 0.08～0.09MPa, keeps 2h; Be warmed up to 90 ± 5 ℃ subsequently under the normal pressure, keep 1h; Pressure heat-preserving 5h afterwards, pressure is gauge pressure 0.4～0.5MPa, plate is got in last release.
Processing step three: the slab through the lignin solution impregnation is put into hot press, closed press fast boosts, and be 15mm with backing plate control slab thickness, press is rapidly heated to 170 ℃, producing steam pressure between lower platen on airtight is 0.6～0.8MPa, keep-uped pressure 16 minutes, press is still closed after the step-down, and plate is got in release after 45 minutes.
Processing step four: the slab post-processed is the stacking of slab being carried out 14 days, can carry out performance test etc.The concrete performance indications of slab are: MOR 85～106MPa, elastic modelling quantity 9098～12000MPa, 24h thickness swelling rate 7.5～9.0%, slab density 0.69～0.71g/cm
3, mat moisture content 9%, burst size of methanal reach the E1 standard, are the E0 category substantially.The performance of the compressive plate that lignin modified back of following table explanation and unmodified method are made relatively.
The performance of the compressive plate that lignin modified back of table 1 and unmodified method are made relatively
| Method of modifying | MOR (MPa) | Elastic modelling quantity (MPa) | 24h thickness swelling rate (%) | Density g/cm 3 | Moisture content (%) | Burst size of methanal (perforation method) (mg/100g) |
| Lignin 5% | 106 | 12000 | 9.0 | 0.692 | 9 | 2.4 |
| Lignin 8% | 92 | 11024 | 8.3 | 0.705 | 9 | 2.4 |
| Lignin 10% | 85 | 9098 | 7.5 | 0.710 | 9 | 2.5 |
| Unmodified | 139.32 | 14780 | 18.70 | 0.591 | 8.8 | - |
Annotate: thickness of slab 16mm
In in the table 1 first three time test, adopts first kind of prescription, promptly adopting the lignin mass percent respectively is 5%, 8%, 10% solution and 1% formalin preparation mixed solution, and adjust pH is 7, compresses after the impregnation process to make compressive plate.Record the performance indications such as MOR, elastic modelling quantity, 24h thickness swelling rate, density, moisture content and burst size of methanal of compressive plate.Wherein, along with the increase of lignin concentration in the mixed solution, MOR, elastic modelling quantity have small size reduction.But 24 thickness swelling rates significantly reduce, and processing is described, the dimensional stability of compressive plate is significantly increased.Simultaneously, burst size of methanal reaches the E1 standard, is the E0 category substantially.
Adopt prescription two, promptly adopting the lignin mass percent respectively is 5%, 8%, 10% solution and 2% furfural solution preparation mixed solution, and adjust pH is 7, and compression makes compressive plate after the impregnation process, and every performance trend is close with prescription one.
Claims (4)
1. method of utilizing additive containing lignin to prepare cottonwood plank stuff is characterized in that preparation process is:
A. raw material is prepared: choose the poplar slab, the mixed solution of preparation lignin solution and formalin;
B. slab impregnation process: ready poplar slab is immersed application of vacuum in the hermetically sealed can that fills lignin formaldehyde hybrid infusion solution;
C. slab compacting: will go up poplar slab after the step impregnation process and put into the hot press hot-pressing processing and get cottonwood plank stuff.
2. the method for utilizing additive containing lignin to prepare cottonwood plank stuff according to claim 1 is characterized in that the dried moisture content of gas of described poplar slab is 9%～12%.
3. the method for utilizing additive containing lignin to prepare cottonwood plank stuff according to claim 1, it is characterized in that consisting of of the described mixed solution of step a: the mass percent concentration 5～10% of Lignosite, formaldehyde mass percent concentration 1%, adjust pH is to neutral.
4. the method for utilizing additive containing lignin to prepare cottonwood plank stuff according to claim 1 is characterized in that the processing method of step b is: the first step: transferring the vacuum of hermetically sealed can is 0.08～0.09, keeps 2 hours; Second step: hermetically sealed can is warmed up to 85～95 ℃ under an atmospheric pressure, kept 1 hour; The 3rd step: to hermetically sealed can pressure heat-preserving 5 hours, pressure 0.4～0.5MPa, 85～95 ℃ of temperature; The 4th step: take out the poplar slab after the release.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2008100202934A CN100566957C (en) | 2008-02-29 | 2008-02-29 | Utilize the method for additive containing lignin to prepare cottonwood plank stuff |
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| CNB2008100202934A CN100566957C (en) | 2008-02-29 | 2008-02-29 | Utilize the method for additive containing lignin to prepare cottonwood plank stuff |
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| CN101229647A true CN101229647A (en) | 2008-07-30 |
| CN100566957C CN100566957C (en) | 2009-12-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825644A (en) * | 2011-06-16 | 2012-12-19 | 深圳市豪盛装饰制品有限公司 | Plate manufacturing process |
| CN106863498A (en) * | 2017-01-05 | 2017-06-20 | 安徽柏瑞特家居装饰品有限公司 | A kind of method for improving plank dimensional stability |
| CN113370340A (en) * | 2021-06-21 | 2021-09-10 | 德华兔宝宝装饰新材股份有限公司 | Modified fast-growing poplar solid wood floor and modification method thereof |
-
2008
- 2008-02-29 CN CNB2008100202934A patent/CN100566957C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825644A (en) * | 2011-06-16 | 2012-12-19 | 深圳市豪盛装饰制品有限公司 | Plate manufacturing process |
| CN106863498A (en) * | 2017-01-05 | 2017-06-20 | 安徽柏瑞特家居装饰品有限公司 | A kind of method for improving plank dimensional stability |
| CN113370340A (en) * | 2021-06-21 | 2021-09-10 | 德华兔宝宝装饰新材股份有限公司 | Modified fast-growing poplar solid wood floor and modification method thereof |
| CN113370340B (en) * | 2021-06-21 | 2022-06-10 | 德华兔宝宝装饰新材股份有限公司 | Modified fast-growing poplar solid wood floor and modification method thereof |
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| CN100566957C (en) | 2009-12-09 |
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Effective date of registration: 20141120 Address after: The 530100 the Guangxi Zhuang Autonomous Region Nanning Iraq Ling Industrial Zone West Industrial Zone Patentee after: GUANGXI LINAN WOOD CO., LTD. Address before: Longpan road Xuanwu District of Nanjing city Jiangsu province 210037 Xinzhuang No. 9 Patentee before: Nanjing Forestry University |
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