CN104400867A - Preparation method capable of reducing paulownia wood resilience after compression - Google Patents
Preparation method capable of reducing paulownia wood resilience after compression Download PDFInfo
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- CN104400867A CN104400867A CN201410580750.0A CN201410580750A CN104400867A CN 104400867 A CN104400867 A CN 104400867A CN 201410580750 A CN201410580750 A CN 201410580750A CN 104400867 A CN104400867 A CN 104400867A
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- paulownia wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
Abstract
The invention discloses a preparation method capable of reducing paulownia wood resilience after compression. The preparation method comprises the g steps of: (1) sawing paulownia wood; (2) preparing impregnating solution; (3) impregnating the paulownia wood; (4) draining the paulownia wood; (5) hot-pressing and solidifying the paulownia wood; (6) charring the paulownia wood; (7) relieving pressure section by section after charring is completed. After the paulownia wood is subjected to glue impregnation, hot-pressing and solidification and charring treatment, glue liquid which seeps into cell cavities and gaps between cells is hot-pressed and solidified at high temperature to form a large-molecule reticular structure, water molecules are inhibited from entering, by charring at high-temperature, the hemicellulose of the paulownia wood is enabled to be degraded, the concentration of hydrophilic group hydroxyl is greatly reduced, nutrient substances needed by corrosion bacteria are degraded, the wood density is increased, the strength is improved, the resilience after compression of the paulownia wood is reduced, the corrosion resistance of the paulownia wood is also improved, the use range of the paulownia wood is widened, the paulownia wood can replace partial excellent and precious wood, and the contradiction between the continuous decrease of precious wood resources and the increase of wood demands is relieved.
Description
Technical field
The invention belongs to Wooden modifying field, be specifically related to the method for modifying of the compression rebound reducing fast growing wood paulownia, reduced the compression rebound of paulownia wood by dipping, hot pressing and charring process.
Background technology
Paulownia are one of China's short period directed Industry plantation important cultivation seeds, and cultivated area is wide, and timber reserves is large, can be applicable to the fields such as musical instrument, furniture, building materials, ornameutal handiwork.But as fast growing wood, paulownia exist many weak points equally, as density is little, material is partially soft, intensity difference, can not use as load-bearing material.Compression modification is a kind of method of effective raising paulownia wood property, by compression modification, improves paulownia wood density, increases strength of wood.But common compressed wood exists serious resilience problem, absorb the hydrone in air or soak in water and cause timber resilience, impact uses.Therefore, how to control the compression rebound of paulownia wood, while increase paulownia wood intensity, reducing its compression rebound, is the emphasis of research.The present invention carried out the dipping of synvaren before paulownia compression, adhesive is made to enter in paulownia lumen, under high temperature hot pressing, hydroxyl in adhesive molecule and paulownia cellulose noncrystalline domain reacts, greatly reduce hydrophilic radical quantity, in paulownia cell, form macromolecular network structure, and make it be solidificated in paulownia lumen, space between cells and cell membrane microfibril, suppress hydrone to enter, reduce the compression rebound of paulownia wood; Again through high temperature carbonization after hot pressing terminates, make the hemicellulose degradation in paulownia wood cell membrane, thus reduce the quantity of water imbibition group hydroxy further, reduce hygroscopicity and the internal stress of paulownia wood, greatly reduce impregnated carbon paulownia wood in use because of moisture change cause drying shrinkage, bulking and distortion etc., the degraded of hemicellulose simultaneously reduces mushroom nutriment required in wood, thus improves its antiseptic property.
The method reducing paulownia wood compression rebound by first flooding rear charring process has no report.
Summary of the invention
The object of this invention is to provide a kind of method that effectively can reduce paulownia wood compression rebound, in raising paulownia wood density, while increasing mechanical strength, improve its compression rebound and drying shrinkage, bulking performance, load-bearing material can be applied to, outdoor building material, People's Bank of China's plank road plate and all kinds of floor base materials etc., thus widen the scope of application of paulownia wood, for industry of artificial boards provides a kind of modification fast growing wood of function admirable.
The technical solution adopted for the present invention to solve the technical problems is:
Reduce a preparation method for paulownia wood compression rebound, its step comprises:
(1) paulownia wood saw system, paulownia wood is sawed solution and become 200-500mm long, 100-300mm is wide, and slicing is fixed thick in a thickness direction, reserves the thickness of finger gauge by the compression ratio set;
(2) preparation of maceration extract, is diluted to solid content 10-30% by synvaren, add the bleeding agent of the synvaren 2-20% quality after accounting for dilution, stir;
(3) paulownia wood dipping, immerses paulownia wood completely in the adhesive configured and floods 30-90min;
(4) paulownia wood drains, and the paulownia wood after impregnation process is put into 50-60 DEG C of air dry oven 1-2 hour;
(5) paulownia wood hot-press solidifying, controls press hot pressing temperature 130-145 DEG C, unit pressure 2.0-3.0MPa, hot pressing time 40-90min;
(6) paulownia wood charing, adjustment press temperature is to 180-220 DEG C, and hot pressing pressure is constant, carbonization time 4-5 hour;
(7) charing terminates rear pressure release, takes out the dipping charing compression paulownia wood of preparation.
In order to obtain better technique effect, after step (1), paulownia wood carries out drying, puts into the dry 1-2 hour of baking oven of 80-100 DEG C, makes its moisture content not higher than 10%; Described bleeding agent is one or more combinations in AEO, disecoctylmaleate sodium sulfonate, sulfo-succinic acid-Isosorbide-5-Nitrae-dioctyl ester; The addition of described bleeding agent is the 2%-10% of the synvaren quality after dilution.
The invention has the beneficial effects as follows: paulownia wood is by the dipping of phenolic resins glue, it is made to infiltrate in paulownia cell wall cellulose noncrystalline domain, with hydrophilic radical hydroxyl reaction, thus reduce the concentration of paulownia wood inner hydrophilic group, the glue infiltrating lumen and space between cells under later stage HTHP forms macromolecular network structure, thus increases crystal region ratio, increases molecular separating force, suppress hydrone to enter, reduce the compression rebound of paulownia wood.High temperature carbonization makes the hemicellulose degradation of paulownia wood simultaneously, greatly reduce the concentration of hydrophilic radical hydroxyl, and the nutriment of corrosion needed for bacterium is also degraded, at increase density of wood, while improving intensity, reduction paulownia wood compression rebound, its antiseptic property can also be improved, thus widen the scope of application of paulownia wood, part high-quality precious timber can be replaced, alleviate the contradiction between precious timber resource and the timber demand day by day increased constantly reduced.
Detailed description of the invention
Content of the present invention is elaborated further below in conjunction with embodiment.
Embodiment 1
Reduce a preparation method for paulownia wood compression rebound, its step comprises:
1. paulownia wood saw system, is sawn into length 200mm by paulownia wood, the test specimen of width 100mm, and using the thickness of 13mm regulation thick, is 20mm according to the rate control slicing specimen thickness of 35%;
2. paulownia wood is dry, sawed paulownia test specimen is put into dry 2 hours of the drying box of 80 DEG C;
3. the preparation of maceration extract, synvaren being diluted to solid content is 10%, adds the bleeding agent AEO of the synvaren after accounting for dilution 2% quality, stirs, and dried paulownia test specimen is put into and wherein floods 30min; Solid content is the mass percent that emulsion or coating dry that rear remainder accounts for total amount under prescribed conditions;
4. paulownia wood drains, and after having soaked glue, test specimen drains, and puts it into the drying box inner drying 2 hours of 50 DEG C;
5. paulownia wood hot-press solidifying, after drying terminates, adjustment press hot pressing temperature 130 DEG C, hot pressing unit pressure 2.0MPa, puts into press hot pressing 40min by paulownia test specimen;
6. paulownia wood charing, raise hot pressing temperature to 180 DEG C, pressure is constant, carbonizes 5 hours;
7. sectional pressure relief ejecting plate, thermal reactor is put, to be detected.
Use dipping hot pressing charing paulownia wood prepared by the method, density is 0.51g/cm after testing
3, 70 DEG C of poach compression rebound rate of 2 hours is the compression rebound rate of normal-temperature water immersion in 4.12%, 24 hours is 4.03%, meets the Grade A requirement of consolidated floor base material≤4.5% in GB/T 18102-2000.
Embodiment 2
Reduce a preparation method for paulownia wood compression rebound, its step comprises:
1. paulownia wood saw system, is sawn into length 250mm by paulownia wood, the test specimen of width 120mm, and using the thickness of 12mm regulation thick, is 20mm according to the rate control slicing specimen thickness of 40%;
2. paulownia wood is dry, sawed paulownia test specimen is put into dry 1 hour 40 minutes of the drying box of 85 DEG C;
3. the preparation of maceration extract, synvaren being diluted to solid content is 15%, adds the bleeding agent disecoctylmaleate sodium sulfonate of the synvaren after accounting for dilution 5% quality, stirs;
4. paulownia wood dipping, puts into dried paulownia test specimen and wherein floods 50min; Solid content is the mass percent that emulsion or coating dry that rear remainder accounts for total amount under prescribed conditions;
5. paulownia wood drains, and after having soaked glue, test specimen drains, in the drying box putting it into 52 DEG C 1 hour 40 minutes;
6. paulownia wood hot-press solidifying, after drying terminates, adjustment press hot pressing temperature 135 DEG C, hot pressing unit pressure 2.2MPa, puts into press hot pressing 60min by paulownia test specimen;
7. paulownia wood charing, raise hot pressing temperature to 190 DEG C, pressure is constant, carbonizes 4 hours 30 minutes;
8. sectional pressure relief ejecting plate, thermal reactor is put, to be detected.
Use dipping hot pressing charing paulownia wood prepared by the method, density is 0.54g/cm after testing
3, 70 DEG C of poach compression rebound rate of 2 hours is the compression rebound rate of normal-temperature water immersion in 3.98%, 24 hours is 3.81%, meets the Grade A requirement of consolidated floor base material≤4.5% in GB/T 18102-2000.
Embodiment 3
Reduce a preparation method for paulownia wood compression rebound, its step comprises:
1. paulownia wood saw system, is sawn into length 300mm by paulownia wood, the test specimen of width 150mm, and using the thickness of 11mm regulation thick, is 20mm according to the rate control slicing specimen thickness of 45%;
2. paulownia wood is dry, sawed paulownia test specimen is put into dry 1 hour 30 minutes of the drying box of 90 DEG C;
3. the preparation of maceration extract, synvaren being diluted to solid content is 20%, adds the bleeding agent sulfo-succinic acid-Isosorbide-5-Nitrae-dioctyl ester of the synvaren after accounting for dilution 8% quality, stirs;
4. paulownia wood dipping, puts into dried paulownia test specimen and wherein floods 60min; Solid content is the mass percent that emulsion or coating dry that rear remainder accounts for total amount under prescribed conditions;
5. paulownia wood drains, and after having soaked glue, test specimen drains, in the drying box putting it into 55 DEG C 1 hour 30 minutes;
6. paulownia wood hot-press solidifying, after drying terminates, adjustment press hot pressing temperature 140 DEG C, hot pressing unit pressure 2.4MPa, puts into press hot pressing 70min by paulownia test specimen;
7. paulownia wood charing, raise hot pressing temperature to 200 DEG C, pressure is constant, carbonizes 4 hours 15 minutes;
8. sectional pressure relief ejecting plate, thermal reactor is put, to be detected.
Use dipping hot pressing charing paulownia wood prepared by the method, density is 0.56g/cm after testing
3, 70 DEG C of poach compression rebound rate of 2 hours is the compression rebound rate of normal-temperature water immersion in 3.57%, 24 hours is 3.41%, meets the Grade A requirement of consolidated floor base material≤4.5% in GB/T 18102-2000.
Embodiment 4
Reduce a preparation method for paulownia wood compression rebound, its step comprises:
1. paulownia wood saw system, is sawn into length 400mm by paulownia wood, the test specimen of width 200mm, and using the thickness of 10mm regulation thick, is 20mm according to the rate control slicing specimen thickness of 50%;
2. paulownia wood is dry, sawed paulownia test specimen is put into dry 1 hour 20 minutes of the drying box of 95 DEG C;
3. the preparation of maceration extract, synvaren being diluted to solid content is 25%, add the bleeding agent of the synvaren after accounting for dilution 10% quality, bleeding agent is the mixture that AEO and disecoctylmaleate sodium sulfonate add by 1:1 mass ratio, stirs;
4. paulownia wood dipping, puts into dried paulownia test specimen and wherein floods 80min; Solid content is the mass percent that emulsion or coating dry that rear remainder accounts for total amount under prescribed conditions;
5. paulownia wood drains, and after having soaked glue, test specimen drains, in the drying box putting it into 58 DEG C 1 hour 20 minutes;
6. paulownia wood hot-press solidifying, after drying terminates, adjustment press hot pressing temperature 140 DEG C, hot pressing unit pressure 2.6MPa, puts into press hot pressing 80min by paulownia test specimen;
7. paulownia wood charing, raise hot pressing temperature to 210 DEG C, pressure is constant, carbonizes 4 hours 45 minutes;
8. sectional pressure relief ejecting plate, thermal reactor is put, to be detected.
Use dipping hot pressing charing paulownia wood prepared by the method, density is 0.59g/cm after testing
3, 70 DEG C of poach compression rebound rate of 2 hours is the compression rebound rate of normal-temperature water immersion in 3.14%, 24 hours is 3.01%, meets the Grade A requirement of consolidated floor base material≤4.5% in GB/T 18102-2000.
Embodiment 5
Reduce a preparation method for paulownia wood compression rebound, its step comprises:
1. paulownia wood saw system, is sawn into length 500mm by paulownia wood, the test specimen of width 300mm, and using the thickness of 8mm regulation thick, is 20mm according to the rate control slicing specimen thickness of 60%;
2. paulownia wood is dry, sawed paulownia test specimen is put into dry 1 hour of the drying box of 100 DEG C;
3. the preparation of maceration extract, synvaren being diluted to solid content is 30%, add the bleeding agent of the synvaren after accounting for dilution 20% quality, bleeding agent is disecoctylmaleate sodium sulfonate and sulfo-succinic acid-1,4-dioctyl ester presses the mixture that 1:2 mass ratio adds, and stirs;
4. paulownia wood dipping, puts into dried paulownia test specimen and wherein floods 90min; Solid content is the mass percent that emulsion or coating dry that rear remainder accounts for total amount under prescribed conditions;
5. paulownia wood drains, and after having soaked glue, test specimen drains, in the drying box putting it into 60 DEG C 1 hour;
6. paulownia wood hot-press solidifying, after drying terminates, adjustment press hot pressing temperature 145 DEG C, hot pressing unit pressure 3.0MPa, puts into press hot pressing 90min by paulownia test specimen;
7. paulownia wood charing, raise hot pressing temperature to 220 DEG C, pressure is constant, carbonizes 4 hours;
8. sectional pressure relief ejecting plate, thermal reactor is put, to be detected.
Use dipping hot pressing charing paulownia wood prepared by the method, density is 0.61g/cm after testing
3, 70 DEG C of poach compression rebound rate of 2 hours is the compression rebound rate of normal-temperature water immersion in 2.47%, 24 hours is 2.41%, meets the high-class product requirement of consolidated floor base material≤2.5% in GB/T 18102-2000.
Claims (4)
1. reduce a preparation method for paulownia wood compression rebound, its step comprises:
(1) paulownia wood saw system, paulownia wood is sawed solution and become 200-500mm long, 100-300mm is wide, and slicing is fixed thick in a thickness direction, reserves the thickness of finger gauge by the compression ratio set;
(2) preparation of maceration extract, is diluted to solid content 10-30% by synvaren, add the bleeding agent of the synvaren 2-20% quality after accounting for dilution, stir;
(3) paulownia wood dipping, immerses paulownia wood completely in the adhesive configured and floods 30-90min;
(4) paulownia wood drains, and the paulownia wood after impregnation process is put into 50-60 DEG C of air dry oven 1-2 hour;
(5) paulownia wood hot-press solidifying, controls press hot pressing temperature 130-145 DEG C, unit pressure 2.0-3.0MPa, hot pressing time 40-90min;
(6) paulownia wood charing, adjustment press temperature is to 180-220 DEG C, and hot pressing pressure is constant, carbonization time 4-5 hour;
(7) charing terminates rear pressure release, takes out the dipping charing compression paulownia wood of preparation.
2. the preparation method reducing paulownia wood compression rebound as claimed in claim 1, it is characterized in that, after step (1), paulownia wood carries out drying, puts into the dry 1-2 hour of baking oven of 80-100 DEG C, makes its moisture content not higher than 10%.
3. the preparation method reducing paulownia wood compression rebound as claimed in claim 1, is characterized in that, the addition of described bleeding agent is the 2-10% of the synvaren quality after dilution.
4. the preparation method reducing paulownia wood compression rebound as claimed in claim 1, is characterized in that, described bleeding agent is one or more combinations in AEO, disecoctylmaleate sodium sulfonate, sulfo-succinic acid-Isosorbide-5-Nitrae-dioctyl ester.
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Cited By (5)
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| CN107351207A (en) * | 2017-09-12 | 2017-11-17 | 阜南县创发工艺品有限公司 | A kind of willow densification handling process |
| CN107415002A (en) * | 2017-07-28 | 2017-12-01 | 阜南县中信柳木工艺品有限公司 | A kind of weather-proof paulownia wood hardening process |
| CN109396327A (en) * | 2018-12-18 | 2019-03-01 | 苏州美迈快速制造技术有限公司 | A kind of water-based dip applicating paint and preparation method thereof for 3D printing sand mold |
| CN110666912A (en) * | 2019-09-24 | 2020-01-10 | 南京林业大学 | Method for preparing compact wood through synergistic effect of chemical pretreatment and hot pressing |
| CN115990926A (en) * | 2022-07-13 | 2023-04-21 | 上海星衡木业有限公司 | Processing method for improving wood hardness and application thereof |
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| CN107351207A (en) * | 2017-09-12 | 2017-11-17 | 阜南县创发工艺品有限公司 | A kind of willow densification handling process |
| CN109396327A (en) * | 2018-12-18 | 2019-03-01 | 苏州美迈快速制造技术有限公司 | A kind of water-based dip applicating paint and preparation method thereof for 3D printing sand mold |
| CN110666912A (en) * | 2019-09-24 | 2020-01-10 | 南京林业大学 | Method for preparing compact wood through synergistic effect of chemical pretreatment and hot pressing |
| CN115990926A (en) * | 2022-07-13 | 2023-04-21 | 上海星衡木业有限公司 | Processing method for improving wood hardness and application thereof |
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