CN116674042A - Lower wood color changing method based on pH regulation and control - Google Patents
Lower wood color changing method based on pH regulation and control Download PDFInfo
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- CN116674042A CN116674042A CN202310914151.7A CN202310914151A CN116674042A CN 116674042 A CN116674042 A CN 116674042A CN 202310914151 A CN202310914151 A CN 202310914151A CN 116674042 A CN116674042 A CN 116674042A
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- 239000002023 wood Substances 0.000 title claims abstract description 378
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000029219 regulation of pH Effects 0.000 title claims abstract description 14
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 claims abstract description 670
- 238000001035 drying Methods 0.000 claims abstract description 68
- 239000003607 modifier Substances 0.000 claims abstract description 60
- 239000003054 catalyst Substances 0.000 claims abstract description 53
- 239000003381 stabilizer Substances 0.000 claims abstract description 43
- 230000008859 change Effects 0.000 claims abstract description 26
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 24
- 239000012498 ultrapure water Substances 0.000 claims abstract description 24
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002791 soaking Methods 0.000 claims abstract description 13
- 238000005470 impregnation Methods 0.000 claims abstract description 10
- 229920005610 lignin Polymers 0.000 claims abstract description 10
- 238000011010 flushing procedure Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 67
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- 238000001723 curing Methods 0.000 claims description 44
- 239000007864 aqueous solution Substances 0.000 claims description 39
- 239000012047 saturated solution Substances 0.000 claims description 23
- 229920000642 polymer Polymers 0.000 claims description 21
- 241000771208 Buchanania arborescens Species 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- CDMADVZSLOHIFP-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 CDMADVZSLOHIFP-UHFFFAOYSA-N 0.000 claims description 16
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 11
- 238000003848 UV Light-Curing Methods 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 9
- -1 acid anhydride organic compound Chemical class 0.000 claims description 9
- 230000036541 health Effects 0.000 claims description 9
- 230000007935 neutral effect Effects 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 229940045860 white wax Drugs 0.000 claims description 6
- 241000565391 Fraxinus mandshurica Species 0.000 claims description 5
- 241000287828 Gallus gallus Species 0.000 claims description 5
- 239000010875 treated wood Substances 0.000 claims description 5
- 241000219071 Malvaceae Species 0.000 claims description 4
- 235000008632 Santalum album Nutrition 0.000 claims description 2
- 241000221035 Santalaceae Species 0.000 claims 1
- 238000010979 pH adjustment Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 238000004383 yellowing Methods 0.000 abstract description 8
- 238000009776 industrial production Methods 0.000 abstract description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 21
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 21
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 21
- 235000021152 breakfast Nutrition 0.000 description 19
- 241000219000 Populus Species 0.000 description 18
- 230000000694 effects Effects 0.000 description 15
- 210000002421 cell wall Anatomy 0.000 description 7
- 239000003086 colorant Substances 0.000 description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 7
- 235000006408 oxalic acid Nutrition 0.000 description 7
- 230000035882 stress Effects 0.000 description 7
- 238000004043 dyeing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 241000894007 species Species 0.000 description 3
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241000218978 Populus deltoides Species 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 244000184861 Juglans nigra Species 0.000 description 1
- 235000013740 Juglans nigra Nutrition 0.000 description 1
- 240000000513 Santalum album Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019693 cherries Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011094 fiberboard Substances 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- 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
- B27K5/02—Staining or dyeing wood; Bleaching wood
-
- 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
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a lower wood color changing method based on pH regulation, which comprises the following steps: performing color recognition on the wood; removing lignin from the wood with deep color, and then flushing with ultrapure water and soaking with absolute ethyl alcohol to obtain standby wood; drying the wood with light color to obtain standby wood; preparing furfuryl alcohol water solution containing certain furfuryl alcohol concentration according to the color of the wood after color change, adding a catalyst and a stabilizer into the furfuryl alcohol water solution, and regulating the pH value of the furfuryl alcohol water solution to obtain a furfuryl alcohol modifier; the furfuryl alcohol modifier is used as impregnating solution to impregnate the standby wood, and residual impregnating solution and impregnated wood are obtained after the impregnation is completed; curing, drying and preserving the impregnated wood to obtain the modified wood. The color-changing method for the lower wood can improve yellowing resistance of the material while changing the color, can save energy, is environment-friendly, and has wide industrial production space.
Description
Technical Field
The invention relates to the field of decorative veneers, in particular to a method for changing color of lower wood based on pH regulation and control, which relates to veneers with simulated colors of high-quality hardwood and improved surface bonding strength.
Background
In order to save precious wood and production cost and improve the appearance quality of the product, the surface of the product needs to be protected or functionalized. The solid wood furniture usually adopts a coating mode to improve the artistic effect of the appearance of the product, while the artificial boards such as medium density fiber boards, shaving boards and the like are used as the board furniture of the base material, and the surface of the base material is often required to be coated with decorative materials with different textures and colors according to the types of the decorative materials.
The wood dyeing is an important means for wood proliferation, realizes the use value of low-grade wood, and meets the ornamental requirement of people on high-grade wood products. However, a large amount of inorganic salt and a color-fixing alkaline agent are used for color fixation in dyeing, and the yellowing resistance of the material is influenced; meanwhile, the demand for heat energy in the dyeing process is increased, and the demand for energy is increased. Therefore, the color-changing process of the low-grade wood is environment-friendly and recyclable, can improve the yellowing resistance of the material while realizing color changing, can save energy, and has wide industrial production space.
Disclosure of Invention
The invention aims to solve the technical problem of providing the low-grade wood color changing method based on pH regulation and control, which can improve yellowing resistance of materials, save energy sources, is environment-friendly and has wide industrial production space while realizing color changing.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a pH regulation-based lower wood color changing method comprises the following steps:
step 1: performing color recognition on the wood;
step 2: removing lignin from the wood with deep color, flushing the treated wood with ultrapure water and soaking the treated wood with absolute ethyl alcohol to obtain standby wood; drying the wood with light wood color to obtain standby wood, which is also called standby veneer;
step 3: preparing furfuryl alcohol water solution containing certain furfuryl alcohol concentration according to the color of the wood after color change, adding a catalyst and a stabilizer into the furfuryl alcohol water solution, and regulating the pH value of the furfuryl alcohol water solution to obtain a furfuryl alcohol modifier after the pH value is regulated;
step 4: the furfuryl alcohol modifier is used as impregnating solution to impregnate the standby wood, and residual impregnating solution and impregnated wood are obtained after the impregnation is completed;
step 5: curing, drying and preserving the impregnated wood to obtain the modified wood.
As a further improved technical scheme of the invention, the method further comprises the following steps:
step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
As a further improved technical scheme of the present invention, the step 1 specifically includes:
and (3) using a color tester to read the Lab value of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with deep color, otherwise, the wood with light color is the wood with light color.
As a further improved technical scheme of the invention, the thickness of the wood is less than or equal to 5mm, and the wood belongs to thin wood and veneer and is used for veneering furniture decorative boards.
As a further improved technical scheme of the present invention, the step 2 specifically includes:
when the thickness of the wood with the wood color depth is less than or equal to 1mm, coating the surface of the wood by using a hydrogen peroxide solution with the mass concentration of 30%, and then irradiating the wood by using a 395nm high-energy UV curing lamp for 30-120 min; when the thickness of the wood with deep wood color is larger than 1mm, soaking the wood in hydrogen peroxide solution with the mass concentration of 30% for 1-2 h, and then irradiating the wood by using a 395nm high-energy UV curing lamp for 90-180 min;
after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so as to obtain standby wood;
and drying the light wood at the temperature of 103 ℃ for 12-24 hours to obtain the standby wood.
As a further improved technical scheme of the present invention, the step 3 specifically includes:
if the color of the wood is changed into the color of black walnut-like, black sandalwood or black chicken wing wood, preparing furfuryl alcohol aqueous solution with the mass concentration of furfuryl alcohol of 50-70%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, regulating the pH value of the furfuryl alcohol aqueous solution, and regulating the pH value to 3 to obtain the furfuryl alcohol modifier;
if the color of the wood is changed into the color of the basswood or the fraxinus mandshurica, preparing a furfuryl alcohol aqueous solution with the furfuryl alcohol mass concentration of 30-50%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to be 5, and obtaining the furfuryl alcohol modifier;
if the color of the wood is changed into the color of white wax or oak, preparing furfuryl alcohol aqueous solution with the mass concentration of 10%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to 5-7, and obtaining the furfuryl alcohol modifier.
As a further improved technical scheme of the invention, the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate.
As a further improved technical scheme of the invention, the catalyst is a strong acid or anhydride organic compound.
As a further improved technical scheme of the present invention, the step 4 specifically includes:
and (3) impregnating the standby wood at normal temperature and pressure by using a furfuryl alcohol modifier for 2-24 hours.
As a further improved technical scheme of the present invention, the step 5 specifically includes:
curing the impregnated wood at 105-115 ℃ for 1-5 h;
drying at 80deg.C for 5-8 hr; drying at 103 ℃ for 8-11 h; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
The beneficial effects of the invention are as follows:
firstly, carrying out color recognition on wood, wherein the wood with deep wood color is subjected to lignin removal treatment, washing with ultrapure water and soaking with absolute ethyl alcohol, and further cleaning residual medicament to obtain standby wood; the light wood is only subjected to drying treatment; and secondly, preparing furfuryl alcohol modifier with proper furfuryl alcohol concentration and pH value according to the color which is finally required to change the color, soaking the wood for standby use by the furfuryl alcohol modifier, and curing, drying and preserving the soaked wood to realize the color change. The invention can realize the imitation of the primary colors of multi-span wood through furfuryl alcohol modifiers with different furfuryl alcohol concentrations and pH values, and simultaneously the bonding strength of the modified wood on MDF can reach more than 0.4MPa, and the wood after color change can be used for veneering furniture decorative boards. The invention uses recyclable furfuryl alcohol for soaking and color changing treatment, the waste liquid is further utilized, and the problem of environmental pollution caused by the waste liquid treatment of the current dyeing technology is solved; and the whole process is environment-friendly, the FA polymer in the waste liquid is recycled, the energy is saved, and the heat energy requirement of the whole process is not great. Compared with dyeing, the color changing method does not use a large amount of inorganic salt and color fixing alkaline agent, and improves the yellowing resistance of wood. The veneer treated by the color-changing method can imitate the colors of dark high-grade woods such as black walnut, chicken wing and the like and light-colored woods such as cherry, rubber and white wax, and has wide industrial production space.
Drawings
FIG. 1 is a flow chart of the color changing method of the present invention.
Fig. 2 is a graph showing the color comparison of wood having a dark wood color without lignin removal treatment and wood having a dark wood color with lignin removal treatment, which was impregnated with a furfuryl alcohol modifier having a furfuryl alcohol mass concentration of 70% and a pH value of 3, and cured, dried, and cured, respectively.
Fig. 3 is a graph showing the color-changing effect of a light-colored poplar breakfast obtained by drying, impregnating with furfuryl alcohol modifiers of different furfuryl alcohol concentrations and pH values, curing, drying and curing.
Fig. 4 is a schematic view of the bond strength of the surface of a modified colored poplar breakfast obtained by drying, impregnating with furfuryl alcohol modifiers of different furfuryl alcohol concentrations and pH values, curing, drying and curing.
Fig. 5 is a schematic diagram showing the color difference between the light wood after the color change by the method of the invention and the wood after the color change after artificial aging for 36 hours.
Detailed Description
The following is a further description of embodiments of the invention, with reference to the accompanying drawings:
example 1:
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 0.3mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is wood with deep color, such as fraxinus mandshurica, oak and other tree species or late wood and other thin wood which is easy to yellow; otherwise, the wood is light-colored wood, such as early wood of light-colored wood of poplar or fir, etc.
Step 2: because the wood has great influence on the colors of the early and late wood and the tree species, the lignin removal treatment is carried out on the tree species with lower brightness and yellowing and the late wood, namely the wood with deep wood color, so as to improve the brightness of the standby veneer; the treated wood is washed by ultrapure water and soaked by absolute ethyl alcohol, so as to clean the residual medicament and obtain standby wood; and drying the wood veneer with lighter colors and no obvious yellowing, namely the wood with light colors, to obtain the standby wood. The method comprises the following steps:
when the wood identified in the step 1 belongs to the wood with deep wood color, coating the surface of the wood with a hydrogen peroxide solution with the concentration of 30%, and then irradiating the wood with a 395nm high-energy UV curing lamp for 30min; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at 103 ℃ for 12 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is changed into the color of black walnut-like, black sandalwood-like or black chicken wing wood, preparing furfuryl alcohol aqueous solution with the concentration of Furfuryl Alcohol (FA) of 50 percent, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, regulating the pH value of the furfuryl alcohol aqueous solution to be 3, and obtaining the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is regulated to 3, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 0.5; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 1; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 2 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 105 ℃ for 1h; drying at 80deg.C for 5 hr; drying at 103 ℃ for 8 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use. In step 6, the unpolymerized furfuryl alcohol attached to the surface of the furfuryl alcohol polymer may be dissolved in ultrapure water and the furfuryl alcohol polymer reacted with a stabilizer to provide furfuryl alcohol. The furfuryl alcohol aqueous solution finally obtained can be used as furfuryl alcohol aqueous solution in the step 3, and the furfuryl alcohol concentration determination method in the furfuryl alcohol aqueous solution in the step 6 comprises the following steps: and taking a part of furfuryl alcohol aqueous solution as a sample solution, and determining the concentration of furfuryl alcohol in the furfuryl alcohol aqueous solution through the addition amount of the stabilizer and the change amount of the pH value. Of course, existing conventional methods may also be employed.
Example 2:
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 0.6mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with the wood color depth; otherwise, the wood is light in color.
Step 2: when the wood identified in the step 1 belongs to the wood with deep wood color, coating the surface of the wood with a hydrogen peroxide solution with the concentration of 30%, and then irradiating the wood with a 395nm high-energy UV curing lamp for 75min; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at 103 ℃ for 12 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is required to be changed into the color imitating basswood or fraxinus mandshurica, preparing a furfuryl alcohol water solution with the furfuryl alcohol concentration of 30 percent, adding a catalyst and a stabilizer into the furfuryl alcohol water solution, adjusting the pH value of the furfuryl alcohol water solution to be 5, and obtaining the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is adjusted to be 5, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 1; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 3; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 2 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 105 ℃ for 2 hours; drying at 80deg.C for 5 hr; drying at 103 ℃ for 8 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
Example 3:
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 1mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with the wood color depth; otherwise, the wood is light in color.
Step 2: when the wood identified in the step 1 belongs to the wood with deep wood color, coating the surface of the wood with a hydrogen peroxide solution with the concentration of 30%, and then irradiating the wood with a 395nm high-energy UV curing lamp for 120min; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at 103 ℃ for 12 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is required to be changed into white wax or oak-like color, preparing furfuryl alcohol aqueous solution with the furfuryl alcohol concentration of 10 percent, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to be 5, and obtaining the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is adjusted to be 5, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 1; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 3; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 2 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 105 ℃ for 2 hours; drying at 80deg.C for 5 hr; drying at 103 ℃ for 8 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
Example 4:
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 2mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with the wood color depth; otherwise, the wood is light in color.
Step 2: when the wood identified in the step 1 belongs to the wood with deep wood color, soaking the wood in a hydrogen peroxide solution with the concentration of 30% for 1h, and then irradiating the wood with a 395nm high-energy UV curing lamp for 90min; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at 103 ℃ for 18 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is required to be changed into white wax or oak-like color, preparing furfuryl alcohol aqueous solution with the furfuryl alcohol concentration of 10 percent, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to be 5, and obtaining the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is adjusted to be 5, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 1; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 3; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 4 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 110 ℃ for 3 hours; drying at 80deg.C for 8 hr; drying at 103 ℃ for 11 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
Example 5:
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 3mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with the wood color depth; otherwise, the wood is light in color.
Step 2: when the wood identified in the step 1 belongs to the wood with deep wood color, soaking the wood in a hydrogen peroxide solution with the concentration of 30% for 2 hours, and then irradiating the wood with a 395nm high-energy UV curing lamp for 130 minutes; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at 103 ℃ for 20 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is required to be changed into white wax or oak-like color, preparing furfuryl alcohol aqueous solution with the furfuryl alcohol concentration of 10 percent, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to 7, and obtaining the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is regulated to 7, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 4.5; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 12; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 8 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 110 ℃ for 3 hours; drying at 80deg.C for 8 hr; drying at 103 ℃ for 11 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
Example 6;
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 4mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with the wood color depth; otherwise, the wood is light in color.
Step 2: when the wood identified in the step 1 belongs to the wood with deep wood color, soaking the wood in a hydrogen peroxide solution with the concentration of 30% for 2 hours, and then irradiating the wood with a 395nm high-energy UV curing lamp for 180 minutes; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at the temperature of 103 ℃ for 24 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is required to be changed into the color of black walnut-like, black sandalwood-like or black chicken wing wood, preparing furfuryl alcohol aqueous solution with the furfuryl alcohol concentration of 70%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, regulating the pH value of the furfuryl alcohol aqueous solution, and regulating the pH value to be 3 to obtain the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is regulated to 3, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 0.5; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 1; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 12 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 115 ℃ for 5 hours; drying at 80deg.C for 8 hr; drying at 103 ℃ for 11 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
Example 7;
a lower wood color changing method based on pH regulation and control, as shown in figure 1, comprises the following steps:
step 1: color recognition was performed on 5mm wood: using a color tester to read Lab values of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with the wood color depth; otherwise, the wood is light in color.
Step 2: when the wood identified in the step 1 belongs to the wood with deep wood color, soaking the wood in a hydrogen peroxide solution with the concentration of 30% for 2 hours, and then irradiating the wood with a 395nm high-energy UV curing lamp for 180 minutes; after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so that the standby wood is obtained. And (3) when the wood identified in the step (1) belongs to the wood with light wood color, drying the wood with light wood color at the temperature of 103 ℃ for 24 hours to obtain the standby wood.
Step 3: according to the color of the wood after color change, namely the wood is required to be changed into the color imitating basswood or fraxinus mandshurica, preparing a furfuryl alcohol water solution with the furfuryl alcohol concentration of 50 percent, adding a catalyst and a stabilizer into the furfuryl alcohol water solution, adjusting the pH value of the furfuryl alcohol water solution to be 5, and obtaining the furfuryl alcohol modifier;
wherein the stabilizer is a saturated solution of NaOH or sodium tetraborate decahydrate. The catalyst is one or more of strong acid and/or anhydride organic compounds, such as oxalic acid, citric acid, maleic anhydride, acetic anhydride and the like.
The above should be noted: 1. the addition amount of the catalyst is not more than 4% of the furfuryl alcohol content, because more than 4% of the furfuryl alcohol resin generates larger internal stress on the wood cell wall when being solidified; 2. taking 100mL of furfuryl alcohol modifier as an example, when the pH is adjusted to be 5, the ratio of the addition amount of the NaOH saturated solution to the addition amount of the catalyst is 1; the ratio of the addition amount of the sodium tetraborate decahydrate saturated solution to the addition amount of the catalyst is 3; 3. the addition of the catalyst and the stabilizer has little influence on the concentration of the FA, and the change amount of the concentration of the FA is negligible.
Step 4: and (3) taking the furfuryl alcohol modifier as an impregnating solution, impregnating the standby wood at normal temperature and normal pressure for 24 hours, and obtaining residual impregnating solution and impregnated wood after the impregnation is completed.
Step 5: curing the impregnated wood at 115 ℃ for 5 hours; drying at 80deg.C for 8 hr; drying at 103 ℃ for 11 hours; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
Step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
As shown in fig. 2, the wood with the color depth measured in fig. 2 (a) is subjected to lignin removal in the step 2, is impregnated with a furfuryl alcohol modifier with the furfuryl alcohol concentration of 70% and the pH value of 3, and is finally cured, dried and cured to obtain the color of the wood; in fig. 2, (b) is the color of wood obtained by directly impregnating the wood with a furfuryl alcohol modifier having a furfuryl alcohol concentration of 70% and a pH value of 3, and finally curing, drying and curing without delignifying the wood of which the color is measured as the depth of the wood; as can be seen from fig. 2, the wood obtained by removing lignin from the thin wood and then impregnating the thin wood is redder in color, does not affect the main color tone, and has a matte color; the wood obtained by directly dipping without removing lignin is blackish in color and has no matte color. As shown in fig. 3, the wood with light color (namely poplar breakfast) is subjected to drying treatment, impregnated with furfuryl alcohol modifier with different furfuryl alcohol concentrations and pH values, and cured, dried and cured to obtain the wood color changing effect diagram. Fig. 3 (a) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating the wood with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 10% and a pH value of 3;
fig. 3 (b) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating the wood with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 30% and a pH value of 3; fig. 3 (c) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 50% and a pH value of 3; fig. 3 (d) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating the wood with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 70% and a pH value of 3; fig. 3 (e) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood (i.e., poplar breakfast) with light color and impregnating with a furfuryl alcohol modifier having a furfuryl alcohol concentration of 10% and a pH value of 5; fig. 3 (f) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood (i.e., poplar breakfast) with light color and impregnating with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 30% and a pH value of 5; fig. 3 (g) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 50% and a pH value of 5; fig. 3 (h) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 70% and a pH value of 5; fig. 3 (i) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood (i.e., poplar breakfast) with light color and impregnating with a furfuryl alcohol modifier having a furfuryl alcohol concentration of 10% and a pH value of 7; fig. 3 (j) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and impregnating the wood with a furfuryl alcohol modifier with a furfuryl alcohol concentration of 30% and a pH value of 7; fig. 3 (k) is a graph showing the color-changing effect of wood obtained by curing, drying and curing after drying the wood (i.e., poplar breakfast) with light color and impregnating with a furfuryl alcohol modifier having a furfuryl alcohol concentration of 50% and a pH value of 7; fig. 3 (l) is a graph showing the effect of changing the color of wood obtained by curing, drying and curing after drying the wood with light color (i.e., poplar breakfast) and soaking the wood with a furfuryl alcohol modifier having a furfuryl alcohol concentration of 70% and a pH value of 7. As shown in fig. 4, fig. 4 is a schematic diagram of the surface bonding strength of the wood after color change, which is obtained by curing, drying and curing after drying the wood with light color (i.e. poplar breakfast) and impregnating the wood with furfuryl alcohol modifiers with different furfuryl alcohol concentrations and pH values, wherein the abscissa indicates the furfuryl alcohol concentration of the furfuryl alcohol modifier (i.e. the furfuryl alcohol concentration of the furfuryl alcohol aqueous solution prepared in step 3), and the ordinate indicates the surface bonding strength, i.e. the bonding strength of the wood on MDF. The standard of the surface bonding strength is 0.4, and the bonding strength of the wood (also called veneer) subjected to color change in fig. 4 on the MDF is all greater than 0.4, which indicates that the bonding performance of the veneer veneering is not affected by the method of the invention. As shown in fig. 5, fig. 5 is a schematic diagram of color difference between the wood (without UV irradiation 36 h) after the wood with light color (i.e. poplar breakfast) is dried, impregnated with furfuryl alcohol modifier with different furfuryl alcohol concentration and pH value, cured, dried and cured, and the wood after color change is artificially aged for 36h (i.e. UV irradiation 36 h).
The RV corresponding to the dashed line in fig. 5 is the color difference (20) between the poplar breakfast not treated by the method of the present invention and the wood obtained after artificial aging of the poplar breakfast for 36 hours (i.e. UV irradiation for 36 hours); wherein the abscissa indicates the furfuryl alcohol concentration of the furfuryl alcohol modifier (i.e., the furfuryl alcohol concentration of the aqueous furfuryl alcohol solution prepared in step 3), and the ordinate indicates the color difference. FIG. 5 illustrates that the color differences obtained after the treatment of the present invention are all less than 20, and the color changing method of the present invention improves the yellowing resistance of the wood.
The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.
Claims (10)
1. The lower wood color-changing method based on pH regulation is characterized by comprising the following steps of:
step 1: performing color recognition on the wood;
step 2: removing lignin from the wood with deep color, flushing the treated wood with ultrapure water and soaking the treated wood with absolute ethyl alcohol to obtain standby wood; drying the wood with light color to obtain standby wood;
step 3: preparing furfuryl alcohol water solution containing certain furfuryl alcohol concentration according to the color of the wood after color change, adding a catalyst and a stabilizer into the furfuryl alcohol water solution, and regulating the pH value of the furfuryl alcohol water solution to obtain a furfuryl alcohol modifier after the pH value is regulated;
step 4: the furfuryl alcohol modifier is used as impregnating solution to impregnate the standby wood, and residual impregnating solution and impregnated wood are obtained after the impregnation is completed;
step 5: curing, drying and preserving the impregnated wood to obtain the modified wood.
2. The pH-controlled lower wood color-changing method according to claim 1, further comprising the steps of:
step 6: and (3) after the residual impregnating solution is deposited for 7 days, separating the solution and the furfuryl alcohol polymer by using a centrifugal machine, adding ultrapure water into the furfuryl alcohol polymer obtained after separation, stirring, adding a stabilizer after stirring for 30min to obtain an aqueous furfuryl alcohol solution, and recycling the aqueous furfuryl alcohol solution to the step (3) for use.
3. The method for changing color of lower wood based on pH control according to claim 1, wherein the step 1 is specifically:
and (3) using a color tester to read the Lab value of the wood, wherein the wood with the L value or the b value smaller than 64 is the wood with deep color, otherwise, the wood with light color is the wood with light color.
4. The pH-control-based lower wood color-changing method according to claim 1, wherein the wood thickness is 5mm or less.
5. The method for changing color of lower wood based on pH control according to claim 1, wherein the step 2 is specifically:
when the thickness of the wood with the wood color depth is less than or equal to 1mm, coating the surface of the wood by using a hydrogen peroxide solution with the mass concentration of 30%, and then irradiating the wood by using a 395nm high-energy UV curing lamp for 30-120 min; when the thickness of the wood with deep wood color is larger than 1mm, soaking the wood in hydrogen peroxide solution with the mass concentration of 30% for 1-2 h, and then irradiating the wood by using a 395nm high-energy UV curing lamp for 90-180 min;
after the irradiation is finished, the wood is rinsed to be neutral by ultrapure water, and then the wood is soaked by absolute ethyl alcohol for 12 hours, so as to obtain standby wood;
and drying the light wood at the temperature of 103 ℃ for 12-24 hours to obtain the standby wood.
6. The method for changing color of lower wood based on pH control according to claim 1, wherein the step 3 is specifically:
if the color of the wood is changed into the color of black walnut-like, black sandalwood or black chicken wing wood, preparing furfuryl alcohol aqueous solution with the mass concentration of furfuryl alcohol of 50-70%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, regulating the pH value of the furfuryl alcohol aqueous solution, and regulating the pH value to 3 to obtain the furfuryl alcohol modifier;
if the color of the wood is changed into the color of the basswood or the fraxinus mandshurica, preparing a furfuryl alcohol aqueous solution with the furfuryl alcohol mass concentration of 30-50%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to be 5, and obtaining the furfuryl alcohol modifier;
if the color of the wood is changed into the color of white wax or oak, preparing furfuryl alcohol aqueous solution with the mass concentration of 10%, adding a catalyst and a stabilizer into the furfuryl alcohol aqueous solution, adjusting the pH value of the furfuryl alcohol aqueous solution to 5-7, and obtaining the furfuryl alcohol modifier.
7. The method for modifying color of lower wood based on pH adjustment according to claim 6, wherein the stabilizer is NaOH or saturated solution of sodium tetraborate decahydrate.
8. The method for changing color of lower wood based on pH control according to claim 6, wherein the catalyst is a strong acid or an acid anhydride organic compound.
9. The method for changing color of lower wood based on pH control according to claim 1, wherein the step 4 is specifically:
and (3) impregnating the standby wood at normal temperature and pressure by using a furfuryl alcohol modifier for 2-24 hours.
10. The method for changing color of lower wood based on pH control according to claim 1, wherein the step 5 is specifically:
curing the impregnated wood at 105-115 ℃ for 1-5 h;
drying at 80deg.C for 5-8 hr; drying at 103 ℃ for 8-11 h; finally, the wood is subjected to health preservation for 7 days at 25 ℃ and 65% RH, and finally the wood with changed color is obtained.
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| CN1671526A (en) * | 2002-07-26 | 2005-09-21 | 木聚合物技术有限公司 | Furan polymer impregnated wood |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1671526A (en) * | 2002-07-26 | 2005-09-21 | 木聚合物技术有限公司 | Furan polymer impregnated wood |
Non-Patent Citations (1)
| Title |
|---|
| YUSUF SUDO HADI等: "Furfurylation Effects on Discoloration and Physical-Mechanical Properties of Wood from Tropical Plantation Forests", 《JOURNAL OF THE KOREAN WOOD SCIENCE AND TECHNOLOGY》, vol. 50, no. 1, pages 230 - 58 * |
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