CN101722551A - Method for inducing discoloration of acacia wood and acacia stained wood - Google Patents
Method for inducing discoloration of acacia wood and acacia stained wood Download PDFInfo
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- CN101722551A CN101722551A CN200910243640A CN200910243640A CN101722551A CN 101722551 A CN101722551 A CN 101722551A CN 200910243640 A CN200910243640 A CN 200910243640A CN 200910243640 A CN200910243640 A CN 200910243640A CN 101722551 A CN101722551 A CN 101722551A
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Abstract
The invention discloses a method for inducing discoloration of acacia wood and acacia stained wood. The method comprises the steps of sequentially carrying out steaming treatment and vacuum drying treatment on the acacia wood. The acacia discoloration method can induce the color change of the acacia to the direction of red and dark color, obtain uniform stained acacia wood from reddish-brown to red-brown, lead people to feel stable, comfortable and aesthetic, and improve the using value of the acacia.
Description
Technical field
The present invention relates to a kind of painted processing and stained wood of timber, particularly a kind of locust tree Wood Discoloration is handled and the locust tree stained wood.
Background technology
Timber is except that main components such as fibre-bearing element, hemicellulose, lignin, also contain a small amount of enzyme, phenols extract and inorganic salts etc., the variation generation variable color of reacting, issuing living physicochemical properties in the effect of light and heat is decomposed, produced with chemicals to its organic components that contains by microorganism easily.
At present, the minimizing day by day along with domestic and international timber resources makes full use of the emphasis that limited timber resources becomes current research, variable color be timber in its drying, store, recurrent phenomenon in transportation and other processing processing procedures.Especially in the dry processing procedure of timber, when improving the wood utilization performance, brought out sapstain again.Sapstain has hindered the deep processing and efficient utilization of timber to a certain extent.
The variation of the functional group of the color of timber in lignin and be subjected to the influence of external environment that variable color can take place it has been generally acknowledged that variable color is the performance in early stage of foxiness, also is one of defective of wood preservation and process.For many years, the target tightening of home and abroad scholar handle research is in the protection of Wood Discoloration mechanism and sapstain.In fact, Wood Discoloration and not exclusively be the early stage performance of foxiness, as: the chromophoric group increase and decrease makes the variation of wood color, the leaching of the former material of variable color in the timber extract cause Wood Discoloration etc. in the lignin.
For example: publication number is that the application for a patent for invention of CN1250711A discloses a kind of wood processing treatment technology, to stain for wood, the anticorrosion process for treating surface that generally utilizes, this technology adopts and add clear water in anticorrosion groove, the quantitative industrial salt that reinjects, caustic soda and soda ash mixture, and direct dyes is mixed with the aqueous solution, and in the timber input solution with intended for dyeing, at normal temperatures, soaked 24 hours, take out dry.This wood processing treatment technology is to prevent sapstain, and this method has been used chemical reagent, and durability and lack of homogeneity are seriously polluted to environment and timber, mechanical property reduction etc.
Wood Discoloration is a comparatively complex physicochemical process, the factor that causes sapstain is a lot, differences such as seeds, land occupation condition, processing conditions and service condition cause that the factor of sapstain is also inequality, are mainly reflected in the increase and decrease and change of chromophoric group in the timber.It at first occurs in the surface, then gradually to diffusion inside.According to the factor of the variation that causes the wood surface wood color, can be divided into: phototropic, chemical stain, microorganism variable color, thermo-color and enzyme variable color.
The color of timber is one of wood surface character and quality evaluation index, also is one of timber using value evaluation index, and it not only is closely related with people's vision and mental impression, and can reflect character such as the quality of timber and seeds.Because wood color is subjected to temperature, humidity effect bigger, for allochroic seeds in some dry runs, if the color after its variable color meets people's hobby, just can in the drying of wood or other processing processing procedures, bring out variable color, do not using dyestuff and do not making under the prerequisite of wood corrosion, make the change color of timber even and attractive in appearance, and some physics and chemical stain do not influence physics, mechanical property and the serviceability of timber, and be more approaching as the maple birch in the northeast color of its color and cherry under the high temperature drying condition.
The variable color of bringing out of timber is to utilize natural chemical constitution of timber and chemical composition, make its under certain condition recurring structure variation and wood color is changed, thereby obtain all even stained wood attractive in appearance.The variable color of bringing out of timber can be regarded as and do not using any dyestuff or/and under the condition of anticorrisive agent, the dyeing course of timber, the color of timber is changed, bring out in the variable color process by physics or chemical method, bring out the chemical substance (mainly referring to the extract in the timber) in the timber and change with the adjustment lignin in chromophore and auxochrome, make timber produce variable color, and make the quality of timber and the process that outward appearance is optimized.Such variable color not only makes the color of timber more attractive in appearance, and does not influence the use of timber, improves wood utilization and is worth.
Research to sapstain now mostly concentrates on minority assortments such as paulownia, masson pine, Chinese hemlock spruce, linden, dragon spruce and rubber wood timber, and only at the method for preventing variable color, up to the present, also do not bring out the research report of variable color at locust tree (Robinia pseudoacacia).
Locust tree (Robinia pseudoacacia) another name acacia, deciduous tree; Originate in the North America, introduce China 19 end of the centurys, and the Yellow River, Basin of Huaihe River are extensively cultivated, and are the important commerical tree species of northwest, North China.The colored edible of locust tree, extraction essence are good nectariferous plants, and its material texture is straight, drying shrinkage is little, the intensity height, no special odor, still, locust tree is the heartwood seeds, the cross section of base portion timber almost is all heartwood more than 2/3, so locust tree is more easy to change in dry run, simultaneously again because the heartwood of locust tree, the sapwood color distortion is big and wood color is not ideal enough, poor processability does not find as yet and effectively utilizes approach.
In the dry run of locust tree timber,, make locust tree obtain better color, make the color of locust tree trend towards the color of precious timber, so that locust tree obtains higher value by regulating temperature and humidity.
At present, still do not have relevant locust tree timber both at home and abroad and bring out variable color aspect research report.
Summary of the invention
The objective of the invention is provides a kind of method of locust tree sapstain and locust tree variable color wood that is brought out by this method of bringing out at the problem that above-mentioned prior art exists, the inventive method processing ease, processing method are simple, it is convenient to use, the locust tree variable color wood color of preparation is even, wood color trends towards the color of precious timber, makes locust tree timber obtain higher value.
For realizing purpose of the present invention, one aspect of the present invention provides a kind of method of bringing out the locust tree sapstain, comprises that locust tree timber is carried out decatize successively to be handled and vacuum drying treatment.
Wherein, the relative pressure in the described decatize processing procedure is 0-0.75MPa, is preferably 0-0.4MPa, and the relative pressure optimum is 0MPa.
Wherein, the processing time that described decatize is handled is 4-12 hour, is preferably 4-8 hour.
Particularly, locust tree timber is chosen as the core of locust tree.
Wherein, the relative vacuum degree of described vacuum drying treatment is-0.05～-0.1MPa, be preferably-0.07～-0.095MPa.
Wherein, the baking temperature of described vacuum drying treatment≤35 ℃ are preferably 10-30 ℃, and Optimal Temperature is 20-30 ℃.
Particularly, the moisture content of dried locust tree timber is 3-10%, is preferably 3-5%.
The present invention provides a kind of locust tree variable color wood that is prepared from according to the method described above on the other hand.
Variable color processing method of the present invention has following advantage:
1, the present invention brings out locust tree sapstain method processing ease, simple, and it is convenient to use, the low production cost of variable color wood.
2, to bring out the color of locust tree variable color wood of preparation even in the present invention, utilizes the color of the wooden product that is equipped with of locust tree variable color attractive in appearance, improves timber use value.
3, the inventive method has overcome in the stained wood production process because the defective of a large amount of waste water and waste liquid that produce in the dyeing treatment step is beneficial to environmental protection, has reached the purpose of environmental protection.
4, the present invention brings out the method for locust tree variable color, can make common locust tree wood color become the color of precious timber by bringing out variable color, perhaps near the color of precious timber, make low-quality timber obtain the color and the decorative pattern of people's expectation, cover the timber inherent shortcoming, modify the color of timber, improve the quality and the value of timber.
5, the raw material of the locust tree variable color wood of the present invention's preparation is easy to get, and the preparation method is simple, low production cost, and the color of locust tree variable color wood and the color of yellow sandal are approaching, have improved the value of locust tree timber.
The specific embodiment
Locust tree examination material picks up from the Baoji, Shaanxi province city, because thorn ash sapwood is few, sapwood is removed, and it is standby to leave and take core.
Embodiment 1
1) preparation sample
Locust tree timber core is made the sample that specification is 50 * 30 * 30mm (long * wide * thick), select the tangential of color homogeneous and radially the two sides as test surfaces;
2) decatize is handled
The locust tree sample is placed the portable pressure steam sterilizer of the stainless steel that water is housed Hefei Hua Tai Medical Equipment Plant, model: YX-280D MODE), heat temperature raising, make the water in the steamer keep boiling, produce saturated vapor, the locust tree sample is carried out decatize handle, wherein, the relative pressure that decatize is handled is 0MPa, and the time is 4 hours;
3) vacuum drying treatment
Locust tree sample after decatize is handled cools after 25 ℃, places in the vacuum drying chamber, carries out vacuum drying treatment, make locust tree variable color wood, wherein, the vacuum drying temperature is 25 ℃, relative vacuum degree during dry the processing is-0.095MPa that the moisture content of dried locust tree variable color wood is 3%.
According to CIE (L
*a
*b
*) the standard colorimetric characterization system carries out accurate quantification to the locust tree wood color and characterize, and carry out overall aberration (Δ E) and the analysis of vision physical parameter according to experimental result.
CIE (L
*a
*b
*) the main vision physical parameter L of standard colorimetric characterization system
*, a
*, b
*And Ag
*, wherein
L
*: lightness, white object is considered as 100 fully, and Hei object is considered as 0 fully;
a
*: red green axle chromaticity index, be partial to redness more on the occasion of big more expression color, green is partial in the big more expression of negative value more;
b
*: champac axle chromaticity index, be partial to yellow more on the occasion of big more expression color, blueness is partial in the big more expression of negative value more.
Ag
*: hue angle, Ag
*=arctan (b
*/ a
*)
Sample according to tangential and radially the two sides get 3 points and measure, average as final measured value.According to CIE (1976) L
*a
*b
*Colorimetry calculation of parameter Δ L
*, Δ a
*, Δ b
*With Δ E
*Computational methods are:
C
*＝(a
*2+b
*2)
1/2；
ΔE
*＝(ΔL
*2+Δa
*2+Δb
*2)
1/2；
ΔL
*＝L
n *-L
0 *；
Δa
*＝a
n *-a
0 *；
Δb
*＝b
n *-b
0 *；
ΔC
*＝C
n *-C
0 *
ΔAg
*＝Ag
n *-Ag
0 *
Δ L
*: luminosity equation, bright in the same old way on the occasion of the expression comparison, negative value represents that comparison is dark in the same old way;
Δ a
*: a
*Changing value, be partial to redness more on the occasion of big more expression color, the big more expression color of negative value is partial to green more;
Δ b
*: b
*Changing value, be partial to yellow more on the occasion of big more expression color, the big more expression color of negative value is partial to blueness more;
Δ C
*: the color saturation difference, distinct in the same old way on the occasion of the expression comparison, negative value represents that comparison is dark in the same old way dark;
Δ Ag
*: the big more expression tone variations of tone angular difference, numerical value is big more;
Δ E
*: aberration, claim overall aberration again, big more expression measured object of numerical value and tester color distinction are big more.
With of locust tree variable color wood long * wide face is as test surfaces, on test surfaces, select 3 test points arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, the mean value of measurement result is as shown in table 1.
Embodiment 2
The relative pressure of handling except decatize is 0MPa, and the time is 6 hours; Sample after decatize is handled cools after 10 ℃, carries out vacuum drying treatment, and its relative vacuum degree is-0.07MPa, and baking temperature is 10 ℃, and the moisture content of dried locust tree variable color wood is outside 10%, and all the other are identical with embodiment 1.
3 test points are selected on surface at locust tree variable color wood arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, and the mean value of measurement result is as shown in table 1.
Embodiment 3
Except the locust tree sample being placed in the portable pressure steam sterilizer of stainless steel, heat temperature raising, the decatize of pressurizeing is handled, and the relative pressure that decatize is handled is 0.1MPa (being that absolute pressure is 0.2MPa), and the processing time is 8 hours; Sample after decatize is handled cools after 30 ℃, carries out vacuum drying treatment, and its relative vacuum degree is-0.09MPa, and baking temperature is 30 ℃, and the moisture content of dried locust tree variable color wood is outside 5%, and all the other are identical with embodiment 1.
3 test points are selected on surface at locust tree variable color wood arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, and the mean value of measurement result is as shown in table 1.
Embodiment 4
Except the locust tree sample being placed in the portable pressure steam sterilizer of stainless steel, heat temperature raising, the decatize of pressurizeing is handled, and the relative pressure that decatize is handled is 0.17MPa (being that absolute pressure is 0.27MPa), and the processing time is 6 hours; Sample after decatize is handled cools after 20 ℃, carries out vacuum drying treatment, and its relative vacuum degree is-0.095MPa, and baking temperature is 20 ℃, and the moisture content of dried locust tree variable color wood is outside 3%, and all the other are identical with embodiment 1.
3 test points are selected on surface at locust tree variable color wood arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, and the mean value of measurement result is as shown in table 1.
Embodiment 5
Except the locust tree sample being placed the portable pressure decatize processor decatize of pressurizeing handle, the relative pressure that decatize is handled is 0.3MPa (being that absolute pressure is 0.4MPa), and the processing time is 8 hours; Sample after decatize is handled cools after 30 ℃, carries out vacuum drying treatment, and its relative vacuum degree is-0.07MPa, and baking temperature is 30 ℃, and the moisture content of dried locust tree variable color wood is outside 10%, and all the other are identical with embodiment 1.
3 test points are selected on surface at locust tree variable color wood arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, and the mean value of measurement result is as shown in table 1.
Embodiment 6
Except the locust tree sample being placed portable pressure decatize processor, the decatize of pressurizeing is handled, the relative pressure that decatize is handled is 0.4MPa (being that absolute pressure is 0.5MPa), processing time is that the sample after 8 hours decatizes are handled cools after 10 ℃, carry out vacuum drying treatment, its relative vacuum degree is-0.09MPa that baking temperature is 10 ℃, the moisture content of dried locust tree variable color wood is outside 5%, and all the other are identical with embodiment 1.
3 test points are selected on surface at locust tree variable color wood arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, and the mean value of measurement result is as shown in table 1.
The vision physical parameter testing result of table 1 locust tree variable color wood
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Sample | |
| ??L * | ??44.26 | ??54.18 | ??35.57 | ??29.97 | ??27.69 | ??24.73 | ??58.95 |
| ??a * | ??8.86 | ??9.06 | ??9.50 | ??8.10 | ??8.19 | ??9.70 | ??8.03 |
| ??b * | ??17.9 | ??17.56 | ??11.00 | ??9.18 | ??11.37 | ??17.24 | ??21.37 |
| ??Ag * | ??63.7 | ??62.7 | ??49.2 | ??48.6 | ??54.2 | ??60.6 | ??69.4 |
| ??ΔL * | ??-14.69 | ??-4.77 | ??-23.38 | ??-28.98 | ??-31.26 | ??-34.22 | ??- |
| ??Δa * | ??0.83 | ??1.03 | ??1.47 | ??0.07 | ??0.16 | ??1.67 | ??- |
| ??Δb * | ??-3.47 | ??-3.81 | ??-10.37 | ??-12.19 | ??-10 | ??-4.13 | ??- |
| ??ΔAg * | ??-5.7 | ??-6.7 | ??-20.2 | ??-20.8 | ??-15.2 | ??-8.8 | ??- |
The test testing result shows:
1, vision physical parameter Δ L in the locust tree variable color processing procedure
*, Δ b
*With Δ Ag
*Be negative value, trend is for reducing; Δ a
*For bringing out variable color and make locust tree change in color trend for increasing, illustrate, can obtain uniform grey bronzing variable color locust tree timber to red and dark direction variation on the occasion of, trend;
2, result of the test shows that the high temperature decatize has locust tree timber and well brings out color changeable effect.The bring out variable color of locust tree timber in dry run is feasible, brings out variable color the variation tendency of locust tree wood color is changed to peony and bronzing direction, can obtain uniform bronzing, allows the people feel steady, comfortable; Locust tree timber brings out variable color under high temperature decatize condition, the color that makes timber is that rufous is to bronzing;
3, the color of the locust tree variable color wood of the inventive method preparation is even, and the difference between the vision physical parameter value of test point is little.
Test routine locust tree variable color wood color uniformity test
Carry out timber example 1 in contrast after the conventional high temperature drying with the locust tree sample, wherein, the relative pressure in the dry run is 0MPa, and baking temperature is 120 ℃, and the moisture content of dried timber is 3%.
With of the locust tree timber of embodiment 1-6 and reference examples long * wide face is as test surfaces, on test surfaces, select 3 test points arbitrarily, adopt the light color colour difference meter of SC-80 (Beijing Kang Guang Instr Ltd.) to measure wood color and vision physical parameter, the test testing result is shown in table 2,3,4,5.
Table 2 locust tree variable color wood color uniformity test result
Table 3 locust tree variable color wood color uniformity test result
Table 4 locust tree variable color wood color uniformity test result
Table 5 locust tree sample colour vision physical parameter result of the test
Test result shows:
On each test point of choosing arbitrarily, the chromaticity index value (L of locust tree variable color wood
*, a
*, b
*, Ag
*) change very for a short time, the relative deviation of each parameter little (in 0.3%) has proved that the color of locust tree variable color wood is uniform and stable.Illustrate that to adopt the inventive method to bring out the color of the variable color thorn ash after the locust tree sapstain even, the visual perception of locust tree variable color wood is attractive in appearance, comfortable, improves the quality of locust tree timber.
The value of reference examples 1 on difference changes greatly, and relative deviation is big, L
*The mean relative deviation of value is 0.66%; a
*The mean relative deviation of value is 11.62%; b
*The mean relative deviation of value is 3.55%; Ag
*Mean relative deviation be 6.42%, relative deviation numerical value is very big on each test point, the account for color homogeneity is very poor.
Control locust tree timber carries out drying, the color homogeneous of the feasible locust tree variable color wood that generates under the low-temperature vacuum drying condition.
Claims (10)
1. a method of bringing out the locust tree sapstain comprises that locust tree timber is carried out decatize successively to be handled and vacuum drying treatment.
2. the method for claim 1 is characterized in that the relative pressure in the described decatize processing procedure is 0-0.75MPa.
3. method as claimed in claim 2 is characterized in that described relative pressure 0-0.4MPa.
4. method as claimed in claim 1 or 2 is characterized in that the processing time that described decatize is handled is 4-12 hour.
5. method as claimed in claim 4 is characterized in that described processing time 4-8 hour.
6. the method for claim 1, the relative vacuum degree that it is characterized in that described vacuum drying treatment be-0.05～-0.1MPa.
7. method as claimed in claim 6, it is characterized in that described relative vacuum degree be-0.07～-0.095MPa.
8. the method for claim 1 is characterized in that baking temperature≤35 ℃ of described vacuum drying treatment.
9. method as claimed in claim 8 is characterized in that described temperature is 10-30 ℃.
10. locust tree variable color wood is characterized in that being prepared from according to method as described in arbitrary as claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910243640A CN101722551A (en) | 2009-12-18 | 2009-12-18 | Method for inducing discoloration of acacia wood and acacia stained wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910243640A CN101722551A (en) | 2009-12-18 | 2009-12-18 | Method for inducing discoloration of acacia wood and acacia stained wood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101722551A true CN101722551A (en) | 2010-06-09 |
Family
ID=42444391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910243640A Pending CN101722551A (en) | 2009-12-18 | 2009-12-18 | Method for inducing discoloration of acacia wood and acacia stained wood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101722551A (en) |
-
2009
- 2009-12-18 CN CN200910243640A patent/CN101722551A/en active Pending
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Application publication date: 20100609 |