CN102152357B - Processing method for enhancing wood cell-wall strength - Google Patents
Processing method for enhancing wood cell-wall strength Download PDFInfo
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- CN102152357B CN102152357B CN 201110070204 CN201110070204A CN102152357B CN 102152357 B CN102152357 B CN 102152357B CN 201110070204 CN201110070204 CN 201110070204 CN 201110070204 A CN201110070204 A CN 201110070204A CN 102152357 B CN102152357 B CN 102152357B
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Abstract
The invention relates to a processing method for enhancing wood cell-wall strength, in particular to a processing method for wood modification aiming at wood cell walls. The processing method comprises the steps in sequence: preparing and detecting dipping treatment fluid; sucking-in in vacuum; pressurizing and dipping; sucking out at negative pressure and returning the treatment fluid in the a pressure dipping tank to a solution storage tank; carrying out secondary vacuumizing treatment and then taking out wet materials subjected to dipping treatment; ageing; drying by grades; and finally taking out the intensified modified wood. Accordingly, upgrading and modifying are unnecessary to carry out on the traditional equipment so that the equipment cost is greatly saved; and the processed soft wood has the advantages of obviously enhanced strength, good dimensional stability, uniform performance and enlarged solid-wood utilization range.
Description
Technical field
The present invention relates to a kind of processing method that increases wood cell wall intensity, specifically the Wooden modifying processing method of carrying out at wood cell wall.
Background technology
At present Chinoiserie and the ground board industry output value occupy the first in the world, and high-grade furniture and ground board industry mainly are to be raw material with the solid wood, and these raw materials mostly are the timber with high strength and good dimensional stability.Along with people increase day by day to the demand of solid wood, and can reduce gradually for the high strength timber that consumes.In recent years, the timber resources of China's supply mainly is artificial forest wood, and the material of these timber is relatively poor, and intensity is low, and the intensity difference opposite sex is bigger, is difficult to directly use as solid wood processing.For this reason, extensively adopt the method for wet heat pressure typing processing and impregnation process to improve wood quality both at home and abroad, improve its intensity, hardness and shrink-resistant energy.
The wet heat pressure typing is handled, refer to that timber discharges the growth stress of timber effectively under controlled wet heat condition, and then timber is carried out pressurized heat typing handle, the distortion that allows high temperature saturated vapor in the hot pressing consume timber inside, distortion back recovers the process of energy.Be that timber is softening in hot water as Japan Patent JP19970367905 " reinforced timber preparation method and manufacturing equipment " (Production of highlyfunctional densified wood and its apparatus), be put into pressurization typing in the good mould of thermal conductance then.The technological requirement of this processing method is higher, and equipment needed thereby requires also harsh, and energy consumption is bigger, and cost is higher; Timber resilience under hygrothermal environment after more particularly typing is strengthened is bigger, causes the dimensional stability of product and surface strength to reduce.
Impregnation process refers to maceration extract is pressed into timber inside, by heating treatment fluid is solidified then and is deposited on process in the timber.As Chinese patent ZL200810013225.5 " process of modifying synthetic resin impregnated wood ", Chinese patent ZL201010214843.3 " process of modifying synthetic resin impregnated wood " and US Patent No. D4031276 " resin impregnating prepares reinforced timber " (Preparation of densified wood impregnated with phenolic resins), all be by earlier process tank being vacuumized the technical process of pressurization again, synthetic resin is pressed in the timber, directly puts into the dry or disposable dry preparation reinforced timber of baking oven classification then.Though these methods have to a certain degree improvement effect, some problems below all existing to the intensity of timber and dimensional stability:
At first, though technical process has all been carried out vacuumizing phase, but the timber in the process tank is vacuumized, only can extract part air in the timber out, treatment fluid is more entered under suction function in the timber, also might enter treatment fluid generation back attack phenomenon in the timber at the vacuum stress-relief process.
Secondly, after pressurized treatments and release, moist wood directly takes out, and there are a large amount of unnecessary treatment fluids in the moist wood surface of this moment, easily causes waste and the problem of environmental pollution for the treatment of fluid.
Moreover, do not pass through the health stage in the treatment process, unseasoned lumber directly carries out drying, this has also hindered the treatment fluid that enters in the wood cell chamber and has spread in wood tissue further under the moisture gradient effect, make in the more lumen that is filled in timber for the treatment of fluid, can not with the effect of cell membrane generation chemical bond.
In sum, no matter the enhancements of existing solid wood and method are the wet heat pressure typing methods, or the organic resin infusion process, exist preparation equipment requirement height, complex process, problems such as expensive raw material price, properties of product instability.
Summary of the invention
The purpose of this invention is to provide a kind of processing method that increases wood cell wall intensity, it mainly is under the condition of existing equipment, and treatment fluid is more entered under suction function in the timber, to the wood cell wall intensive treatment, to improve strength of wood.
The object of the present invention is achieved like this:
A kind of processing method that increases wood cell wall intensity is characterized in that, its step is:
1) configuration of impregnation process liquid and detection: mobile strong, the low viscosity of configuration, has the impregnation process liquid that strengthens function, make the solids content scope for the treatment of fluid 15%～30%, viscosity was 5～15 milli handkerchief seconds, the pH value is adjusted between 6.5～7.5, and the diameter of particle in the treatment fluid is in 1～50 nanometer;
2) vacuum sucks: be that 8%～30% timber is put into the impregnation process jar with moisture content, shut a jar door, the treatment fluid vacuum is sucked in the process tank, vacuumized 10～30 minutes to the impregnation process jar, carry out vacuumizing the first time processing, vacuum is-0.080 MPa～-0.095 MPa;
3) impregnating by pressure: close vavuum pump, the processing of exerting pressure, to exert pressure be 0.8 MPa～1.5 MPas, kept 30～60 minutes;
4) negative pressure sucking-off: remove above-mentioned pressure, the treatment fluid in the pressure immersion can is turned back in the solution storage tank; Connect vavuum pump again, carry out vacuumizing the second time processing, vacuum is-0.080～-0.095 MPa, and the processing time is 5～20 minutes, removes vacuum then, opens a jar door, takes out the moist wood through impregnation process;
5) health: the timber after the impregnation process is put under the room temperature condition stacks more than 24 hours, interlayer is placed wooden parting bead;
6) classification drying: the timber after the health is put into baking oven, place parting bead between timber; First forced convertion drying 3～6 hours under 30 ℃ temperature; Be warming up to 80 ℃ again, forced convertion drying 1～6 hour; Be warming up to 100～105 ℃ then, forced convertion drying 3～6 hours; Stop drying at last, open baking oven, take out and strengthen improved wood.
Described impregnation process liquid is the Ludox maceration extract, and the solids content of this Ludox maceration extract is 21.24%, and viscosity was 6.90 milli handkerchief seconds, and the pH value is 7.22, and the particle size range of the silicon dioxide microparticle in this Ludox maceration extract is 5～40 nanometers.
Purpose beneficial effect of the present invention is: need not existing equipment is carried out upgrading, saved equipment cost greatly; And the softwood intensity after handling significantly increases, and dimensional stability is good, performance is even, and the solid wood that has enlarged softwood utilizes scope.
The specific embodiment
The invention will be further described below in conjunction with exemplary embodiments.
The processing method of increase wood cell wall intensity of the present invention, its step is as follows:
(1) configuration of impregnation process liquid and detection: mobile strong, the low viscosity of configuration, the impregnation process liquid that strengthens function had, as the Ludox of organic synthetic resin such as, phenolic resins or nanometer particle size etc.; Make the solids content scope for the treatment of fluid 15%～30%, viscosity was 5～15 milli handkerchief seconds, and pH (hydrogen ionexponent) value is adjusted between 6.5～7.5, and the diameter of particle in the treatment fluid is in 1～50 nanometer.
Because can the particle size for the treatment of fluid particulate be to determine treatment fluid enter in the timber and the key factor of in-position and degree, when having only grain size less than 50 nanometers, treatment fluid could enter into wood cell wall by the micropore on the wood cell wall, and with the material generation chemical reaction of cell membrane, thereby reach the purpose that strengthens wood cell wall intensity, and then could be from improving the intensity of whole timber in essence.
As dispose the Ludox maceration extract, and making that the solids content of Ludox maceration extract is 21.24%, viscosity was 6.90 milli handkerchief seconds, and the pH value is 7.22, and the particle size range of the silicon dioxide microparticle in the treatment fluid is 5 nanometers～40 nanometers.
(2) vacuum sucks: be 500 millimeters * 80 millimeters * 20 millimeters with specification, moisture content is that 15% artificial forest wood of Cunninghamia lanceolata is put into the impregnation process jar, shut a jar door, open vavuum pump, carry out vacuumizing the first time processing, when vacuum reaches goal pressure, the treatment fluid vacuum is sucked in the process tank, continued to vacuumize 10 minutes to the impregnation process jar, vacuum is-0.095 MPa, to extract the air in the neutralisation treatment jar of wood cell chamber out, makes the easy processed liquid of timber impregnate, and minimizing treatment fluid when release recoils out, keeps more treatment fluid in timber.
(3) impregnating by pressure: when absorption impregnation process liquid reaches capacity under the timber vacuum state, close vavuum pump, the processing of exerting pressure, exerting pressure is 1.0 MPas, keeps 40 minutes, and treatment fluid is pressed in the timber dearly, timber no longer absorbs treatment fluid.
If before timber pickling does not reach capacity, turn off vavuum pump, the air that left behind in the immersion can just is compressed to the top of immersion can so, so when continuing to add Treatment Solution, these gases will be filled to the space that has been evacuated in the timber of process tank top when vacuumizing, so just make this part timber absorb the treatment fluid of lesser amt, the timber that causes same batch processed is inhomogeneous result up and down.
(4) negative pressure sucking-off: remove above-mentioned pressure, the Treatment Solution in the pressure immersion can is turned back in the solution storage tank; Connect vavuum pump again, carry out vacuumizing the second time processing, vacuum is-0.095 MPa, and the processing time is 5 minutes; The purpose that vacuumizes for the second time: the one, for sucking-off is filled in treatment fluid unnecessary in the lumen, reduce the consumption for the treatment of fluid; The 2nd, in order to remove the unnecessary treatment fluid of wood surface, be that the dropping liquid phenomenon does not take place the moist wood surface behind the dipping.Remove vacuum then, open a jar door, take out the moist wood through impregnation process.
(5) health: the wood of Cunninghamia lanceolata after the impregnation process is put under the room temperature condition stacked 24 hours, interlayer is placed wooden parting bead.
(6) classification drying: the timber after the health is put into baking oven, place parting bead between timber; Dry 5 hours of forced convertion under 30 ℃ temperature earlier; Be warming up to 80 ℃ again, dry 4 hours of forced convertion; Be warming up to 103 ℃ then, dry 5 hours of forced convertion; Stop drying at last, open baking oven, take out and strengthen improved wood.The purpose of classification drying is to make the timber of high-moisture percentage reduce cracking and buckling deformation in dry run, and being dried to simultaneously more than 100 ℃ is in order to make fully completion of cure for the treatment of fluid such as Ludox.
The cell membrane intensity of the wood of Cunninghamia lanceolata after the present invention strengthens modification is increased to 23.07GPa by 11.83GPa, and the strength ratio of handling material is untreated and has increased by 95%; The hardness of handling the back cell membrane is increased to 0.95GPa by 0.48GPa, and the hardness ratio of handling material is untreated and has increased by 98%.
Compared with prior art, the present invention has following advantage:
1. required equipment and the process conditions of PROCESS FOR TREATMENT of the present invention and conventional anticorrosion impregnation process are similar, need not existing equipment is carried out upgrading.
2. the wood cell wall after PROCESS FOR TREATMENT of the present invention is compared with untreated timber, and intensity improves more than 90%, and hardness improves more than 95%, can reach the requirement that solid wood utilizes fully.
3. technique processing method of the present invention also can add additives such as anticorrosion, fire-retardant according to the needs that product is used in maceration extract, makes the reinforcement improved wood have multifunctional usage.
Claims (1)
1. a processing method that increases wood cell wall intensity is characterized in that, its step is:
1) preparation of impregnation process liquid and detection: mobile strong, the low viscosity of preparation, has the impregnation process liquid that strengthens function, make the solids content scope for the treatment of fluid 15% ~ 30%, viscosity was 5 ~ 15 milli handkerchief seconds, the pH value is adjusted between 6.5 ~ 7.5, and the diameter of particle in the treatment fluid is in 1 ~ 50 nanometer, described impregnation process liquid is the Ludox maceration extract, and the solids content of this Ludox maceration extract is 21.24%, viscosity was 6.90 milli handkerchief seconds, the pH value is 7.22, and the particle size range of the silicon dioxide microparticle in this Ludox maceration extract is 5 ~ 40 nanometers;
2) vacuum sucks: be that 8% ~ 30% timber is put into the impregnation process jar with moisture content, shut a jar door, the treatment fluid vacuum is sucked in the process tank, vacuumized 10 ~ 30 minutes to the impregnation process jar, carry out vacuumizing the first time processing, vacuum is-0.080 MPa～-0.095 MPa;
3) impregnating by pressure: close vavuum pump, the processing of exerting pressure, to exert pressure be 0.8 MPa～1.5 MPas, kept 30 ~ 60 minutes;
4) negative pressure sucking-off: remove above-mentioned pressure, the treatment fluid in the pressure immersion can is turned back in the solution storage tank; Connect vavuum pump again, carry out vacuumizing the second time processing, vacuum is-0.080～-0.095 MPa, and the processing time is 5 ~ 20 minutes, removes vacuum then, opens a jar door, takes out the moist wood through impregnation process;
5) health: the timber after the impregnation process is put under the room temperature condition stacks more than 24 hours, interlayer is placed wooden parting bead;
6) classification drying: the timber after the health is put into baking oven, place parting bead between timber; First forced convertion drying 3 ~ 6 hours under 30 ℃ temperature; Be warming up to 80 ℃ again, forced convertion drying 1 ~ 6 hour; Be warming up to 100 ~ 105 ℃ then, forced convertion drying 3 ~ 6 hours; Stop drying at last, open baking oven, take out and strengthen improved wood.
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| CN 201110070204 CN102152357B (en) | 2011-03-23 | 2011-03-23 | Processing method for enhancing wood cell-wall strength |
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| CN 201110070204 CN102152357B (en) | 2011-03-23 | 2011-03-23 | Processing method for enhancing wood cell-wall strength |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102699965A (en) * | 2012-06-15 | 2012-10-03 | 辽宁美联复合材料有限公司 | Method for preparing nanometer modified wood |
| CN103600400B (en) * | 2013-11-25 | 2015-12-02 | 南京林业大学 | A kind of bamboo wood composite electrical lamination wood |
| CN106985236A (en) * | 2017-04-21 | 2017-07-28 | 临沂优优木业股份有限公司 | A kind of method for making nanometer wood skin |
| CN107139289B (en) * | 2017-06-15 | 2018-09-25 | 浙江润格木业科技有限公司 | A kind of method of Wooden modifying |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562591A (en) * | 2004-04-12 | 2005-01-12 | 李书 | Method for modifying timber through biotechnology and optoelectronic technology |
| CN1974151A (en) * | 2005-11-25 | 2007-06-06 | 北京林业大学 | Nanometer intercalated timber/montmorillonite composite material and its production process |
| CN101966716A (en) * | 2010-09-15 | 2011-02-09 | 东北林业大学 | Preparation method of wood plastic composite with good interface compatibility |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562591A (en) * | 2004-04-12 | 2005-01-12 | 李书 | Method for modifying timber through biotechnology and optoelectronic technology |
| CN1974151A (en) * | 2005-11-25 | 2007-06-06 | 北京林业大学 | Nanometer intercalated timber/montmorillonite composite material and its production process |
| CN101966716A (en) * | 2010-09-15 | 2011-02-09 | 东北林业大学 | Preparation method of wood plastic composite with good interface compatibility |
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