CN114953075A - Preparation method of high-color-fastness recombined decorative veneer - Google Patents
Preparation method of high-color-fastness recombined decorative veneer Download PDFInfo
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- CN114953075A CN114953075A CN202210498971.8A CN202210498971A CN114953075A CN 114953075 A CN114953075 A CN 114953075A CN 202210498971 A CN202210498971 A CN 202210498971A CN 114953075 A CN114953075 A CN 114953075A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/025—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
- B27K3/20—Compounds of alkali metals or ammonium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
- B27K3/32—Mixtures of different inorganic impregnating agents
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- 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
- B27K5/0055—Radio-waves, e.g. microwaves
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- 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
- B27K5/006—Vibrations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a preparation method of a high-color-fastness recombined decorative veneer, which relates to a method for improving the color fastness of the recombined decorative veneer, belongs to the technical field of recombined decorative material dyeing, and specifically comprises the following steps: step (1), placing the wood veneer in mixed oxidation treatment liquid for dipping and pre-decoloring; step (2), performing secondary decoloring treatment on the pre-decolored wood veneer by using high-energy ray radiation; and (3) dyeing the decolored veneer obtained in the second step by using the chemically modified metal complex dye under the assistance of ultrasonic waves. The method ensures the structural strength of the wood veneer, simultaneously enhances the binding force of the metal complex dye and the wood, improves the permeability of the dye, improves the dyeing efficiency and the light fastness, and has the advantages of low energy consumption, high efficiency and high color fastness compared with the prior art.
Description
Technical Field
The invention relates to the technical field of decorative materials, in particular to a preparation method of a high-color-fastness recombined decorative veneer.
Background
The recombined decorative veneer is a scientific and technological wood veneer in market, and is a wooden decorative material with the characteristics of natural precious tree species wood such as color, pattern and texture or other artistic patterns, which is prepared by using common tree species wood as a raw material, processing the raw material into a veneer through rotary cutting or slicing, and carrying out the process of veneer color matching, gluing assembly, compression molding and the like. When the recombined decorative veneer is irradiated by sunlight or other light sources in the storage and use processes, the color and the luster of the recombined decorative veneer can be changed in different degrees, namely the recombined decorative veneer is easy to fade, the decorative aesthetic property is influenced, and the wide application of the recombined decorative veneer on decorative surfaces of wooden products and the like is severely limited.
In the process of producing the recombined decorative veneer, the wood veneer needs to be bleached first to lighten the color of the wood veneer and reduce the color difference, so that the subsequent procedures of dyeing and toning the veneer are facilitated. The existing bleaching method has great damage to lignin in wood. The damage of the lignin structure not only enables the bleached veneer to be distorted and deformed after being dried, but also affects the compression molding forming and the pattern aesthetic degree of the dyed veneer; meanwhile, the veneer structure becomes loose, which causes the increase of the usage amount of the veneers and the great increase of the production cost of the recombined decorative veneers. The method for bleaching the wood veneer disclosed in CN 106625952B utilizes bacterial liquid to decompose lignin inside the wood, and achieves the purpose of bleaching, but has great damage to the veneer structure, complex steps, and difficult realization in practical production application. CN 105082287A discloses a method for bleaching wood veneers, wherein the bleaching agent needs to be compounded by hydrogen peroxide, hydrochloric acid, sodium carbonate, ammonia water, ammonium fluosilicate and the like, the components are complex, the environmental pollution is easily aggravated, and the bleaching agent has more volatile substances, is easy to stimulate respiratory tracts after being contacted for a long time and endangers the health of human bodies. Therefore, a method for bleaching a wood veneer by specifically removing chromophoric groups in lignin and keeping a self-framework structure of the lignin, which is simple, convenient, easy to implement and quick to clean is needed.
Moreover, the dye type and structure have great influence on the color fastness of the heavy-duty decorative veneer. The metal complex dye structure contains a hydroxyl ligand, a stable structure with excellent light resistance can be formed by complexing with metal ions, but the metal complex dye structure is mainly combined with wood fibers through weak binding forces such as hydrogen bonds, Van der Waals force and the like, so that the light color fastness of the dyed wood is low (3.5-4.0), the advantage of high light color fastness (6.0-7.5) of the metal complex dye is not fully exerted, and the metal complex dye structure needs to be chemically modified to improve the reaction capability of the metal complex dye structure with the hydroxyl on the wood, so that metal complex dye molecules are combined with the wood structure through a covalent bond with strong stability, and the light color fastness of the dyed wood is improved. Therefore, hydroxyl in the metal complex dye molecule can be grafted with a compound containing an epoxy group to form a dye structure containing an active epoxy group. When the wood is dyed, the epoxy group on the chemically modified metal complex dye can react with the hydroxyl group of the wood to form a covalent bond, so that the stable bonding of the metal complex dye and the wood component is realized, and the light fastness of the recombined decorative veneer is improved.
In addition, CN 111633771 a discloses a method for improving dyeing efficiency and light fastness of a recombined decorative material, which performs puffing treatment on wood by a microwave puffing technology to obtain a larger internal channel structure, so as to improve the permeability of metal complex dyes in the wood. Although the microwave bulking technology can increase and expand pore canals penetrated by dye liquor to a certain extent, the number and the size of the pore canals of the treated wood veneer cannot be accurately controlled, so that the pore canals of microwave bulked wood are uneven, and the dye-uptake of dye molecules is different, which not only causes poor level dyeing effect after wood dyeing, but also causes more serious uneven color fading of the dyed veneer due to inconsistent dye-uptake of each area. Therefore, it is necessary to improve the permeability and leveling property of the dye in the interior of the wood. The ultrasonic technology can enable the dye to quickly and uniformly permeate into the wood veneer through mechanical action, cavitation action and thermal action, so that the production efficiency is improved, and the dyeing effect is improved.
In summary, the invention proposes a method for preparing a high-color-fastness recombined decorative veneer, which specifically removes chromophoric groups in lignin during the bleaching of the veneer, and blocks the photobleaching phenomenon of the lignin in the wood veneer caused by photooxidation of the chromophoric groups; the metal complex dye grafted with the epoxy group reacts with the wood hydroxyl group to form stable chemical bonding, so that the interaction between the metal complex dye and the wood hydroxyl group is promoted; and the ultrasonic technology is adopted to promote the efficient and uniform permeation of the metal complex dye in the wood. Finally, the method for preparing the recombined decorative veneer with rapidness, convenience, high efficiency, low consumption and high light fastness is formed.
Disclosure of Invention
In view of the problems existing in the existing preparation technology of the high-color-fastness recombined decorative veneer, the problems comprise loose structure of the wood veneer caused by bleaching treatment, lower binding force between the metal complex dye and the wood, poor permeability and the like. The invention provides a treatment technology for removing wood chromophoric groups in a targeted manner, enhancing chemical bonding between a dye and wood and physically dredging dye permeation channels. The method realizes efficient dye permeation while ensuring the structure and mechanical strength of the wood veneer, and provides a feasible technology for manufacturing the recombined decorative veneer with high color fastness. The technology can improve the color fastness of the full-color series recombined decorative veneer, especially improve the light-resistant color fastness of the light-color series recombined decorative veneer when the dye has low dye-uptake, and simultaneously has the advantages of low energy consumption and high efficiency compared with the prior art.
In order to achieve the above object, the present invention provides a method for preparing a recombined decorative veneer with high color fastness, which comprises the following steps:
the method comprises the following steps of (1) soaking the rotary-cut wood veneer into mixed oxidation treatment liquid of 25-35 wt% of hydrogen peroxide, 1-2 wt% of sodium carbonate and 1-3 wt% of sodium silicate for 1-2 hours to obtain a pre-decolorized wood veneer;
bleaching the impregnated veneer obtained in the step (1) through ultraviolet radiation to obtain a bleached wood veneer;
dissolving metal complex dye into water to obtain dye liquor, adding an epoxy group compound, mixing, heating for reacting for several hours, cooling to room temperature, dropwise adding 30-50 wt% of NaOH aqueous solution into the reaction product, stirring the mixture at room temperature, keeping for 2-4 hours, adding 50% of acetic acid into the mixture to neutralize the solution, grafting epoxy groups onto the metal complex dye, and finally obtaining the metal complex dye liquor containing active epoxy groups;
and (4) cleaning the wood veneer obtained in the step (2) for 1-3 times by using clear water, placing the wood veneer into a metal complex dye mixed dye solution containing an active epoxy group for ultrasonic-assisted dyeing, wherein the dyeing time is 2-8h, the dyeing temperature is 85-98 ℃, and the bath ratio is 1: and (5) 20-40%, removing the dyed veneer, and drying, wherein the water content is controlled to be 10-20%.
In some embodiments, the wood in step (1) is basswood, poplar, african white phoenix tree, red oak, nice, horse oil wood, and the rotary-cut wood veneer has a thickness of 0.5-1.0mm and a water content of 8-30%.
In some embodiments, in the step (1), the concentration of the hydrogen peroxide solution is 25 to 35 wt%, the concentration of the sodium carbonate solution is 1 to 2 wt%, and the concentration of the sodium silicate solution is 1 to 3 wt%, and the soaking is carried out for 1 to 2 hours.
In some embodiments, the power of the ultraviolet lamp in the step (2) is 15-30W, the wavelength range is 190-400nm, and the irradiation time is 1-8 h.
In some embodiments, the reaction temperature in step (3) is 60-80 ℃ and the reaction time is 2-4 h.
In some embodiments, the epoxy compound in step (3) is epichlorohydrin, ethylene glycol diglycidyl ether, glycerol triglycidyl ether.
In some embodiments, the metal complex dye mixed dye liquor in the step (4) is the metal complex dye liquor containing the active epoxy group in the step (1), Na 2 SO 4 NaCl, fatty alcohol-polyoxyethylene ether and sodium dodecyl benzene sulfonate, wherein the weight parts are 100-: 10-40: 10-25: 20-50: 10-30.
In some embodiments, the method for preparing the metal complex dye mixed dye liquor in the step (4) comprises the following steps: adding fatty alcohol-polyoxyethylene ether into metal complex dye solution containing active epoxy groups according to parts by weight, fully stirring for 5-10min, and then adding Na 2 SO 4 NaCl and sodium dodecyl benzene sulfonate are fully stirred for 5-10min to obtain the dye solution.
In some embodiments, the ultrasonic power in step (4) is 400-.
Compared with common dyes, the metal complex dye has the characteristic of high light fastness, and is mainly combined with wood fibers through weak bonding forces such as hydrogen bonds, van der waals force and the like, so that the dyed wood single board has low color fastness, and the dye liquor has poor permeabilityUnder the combined action of dyeing auxiliaries such as fatty alcohol-polyoxyethylene ether and sodium dodecyl benzene sulfonate, the problems of low dyeing rate, low color fastness, poor permeability and the like of the recombined decorative veneer are solved, and meanwhile, the dyeing efficiency is obviously improved. NaCl is used as a leveling agent, so that the metal complex dye can uniformly dye the single plate. Na (Na) 2 SO 4 The dye is used as a color fixing agent to react and crosslink with water-based groups, so that the effect of fixing dye molecules on the recombined decorative veneer is achieved.
In some embodiments, the metal complex dye is a monoazo metal complex acid dye.
Compared with the prior art, the gain effect of the invention comprises: :
(1) the wood veneer bleaching method which is rapid, simple, green, low in energy consumption and easy to implement is adopted to remove chromophoric groups in lignin, the photodiscoloration phenomenon caused by photooxidation of the chromophoric groups in the lignin is blocked, and a good bleaching effect is obtained while the structural strength of wood is not damaged.
(2) The epoxy group compound grafting modification is carried out on the metal complex dye structure, the water-soluble metal complex dye is used for replacing the common acid dye, the hydroxyl in the molecule of the metal complex dye is grafted with the epoxy group compound, the dye structure containing the active epoxy group is formed, and then the dye structure reacts with the hydroxyl of the wood to form a covalent bond, so that the light fastness of the recombined decorative veneer is improved.
(3) Under the combined action of ultrasonic physical assistance and dyeing assistant chemical assistance, the solubility and permeability of the dye are improved, the dyeing efficiency is improved, and the light-resistant color fastness grade of the light-colored dyed veneer is not lower than 4.5 grade at lower dye-uptake.
Detailed Description
Example 1
Step (1), wood bleaching treatment: placing the African white phoenix tree rotary-cut veneer with the water content of 8-30% in a mixed solution of hydrogen peroxide, sodium carbonate and sodium silicate, wherein the concentration of the hydrogen peroxide is 25 wt%, the concentration of the sodium carbonate solution is 1 wt%, and the concentration of the sodium silicate solution is 1 wt%, and soaking for 1 h; then carrying out 15W ultraviolet radiation on the treated veneer for 1 h;
preparing a dyed veneer: rotary cutting African white phoenix tree into 270 × 215 × 0.75mm single boards, selecting several single boards, and controlling water content at 8-30% for use.
Step (3) dye liquor preparation: dissolving 10g of metal complex dye into a proper amount of water to obtain a water solution, adding epoxy chloropropane, mixing, reacting at 70 ℃ for 3 hours, cooling to 25 ℃, dropwise adding a proper amount of 45 wt% NaOH water solution into the reactant, stirring the mixture at room temperature for 3 hours, adding 50% acetic acid into the mixture to neutralize the solution, and obtaining a monoazo metal complex acid dye solution containing an active epoxy group; then, adding fatty alcohol-polyoxyethylene ether (4g) into the metal complex dye solution, adding into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and sequentially adding Na according to parts by weight after completely dissolving 2 SO 4 (2g) NaCl (1.5g) and sodium dodecyl benzene sulfonate (4g), stirring thoroughly for 5-10min, sampling after the temperature is stabilized at 95 deg.C, and detecting dye solution concentration A with ultraviolet spectrophotometer 0 。
Step (4), dyeing process: and (3) caging the standby veneer in the step (2), immersing the standby veneer in the dye liquor prepared in the step (3), keeping the temperature of the dye liquor at 95 ℃, and carrying out ultrasonic-assisted dyeing with the ultrasonic power of 800W, the frequency of 50kHz, the dyeing temperature of 95 ℃, the bath ratio of 1: 20, dyeing for 5 hours, removing after dyeing, drying, controlling the water content to be between 10 and 20 percent to obtain a dyed veneer, supplementing the dyeing solution to 20L, sampling and detecting the concentration A of the dyeing solution 1 Dye uptake ═ A 0 -A 1 )/A 0 *100％。
And (5) detecting the recombined decorative veneer: and (3) carrying out light fastness detection on the dyed veneer prepared in the step (4) according to a method in GB/T28998-.
Example 2
The remaining production process remains unchanged, differing from example 1 in that:
step (3) dye liquor preparation: dissolving 10g of monoazo metal complex acid dye into a proper amount of water to obtain an aqueous solution, and adding ethylene glycol diglycidylMixing glycerol ethers, reacting for 3 hours at 70 ℃, then cooling to 25 ℃, dropwise adding a proper amount of 45 wt% NaOH aqueous solution into the reactants, stirring the mixture at room temperature and keeping for 3 hours, and adding 50% acetic acid into the mixture to neutralize the solution to obtain a monoazo metal complex acid dye solution containing an active epoxy group; then, adding fatty alcohol-polyoxyethylene ether (4g) into the metal complex dye solution, adding into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and sequentially adding Na according to parts by weight after completely dissolving 2 SO 4 (2g) NaCl (1.5g) and sodium dodecyl benzene sulfonate (4g), stirring thoroughly for 5-10min, sampling after the temperature is stabilized at 95 deg.C, and detecting dye solution concentration A with ultraviolet spectrophotometer 0 。
And (4) a dyeing procedure: and (3) caging the standby veneer in the step (2), immersing the standby veneer in the dye liquor prepared in the step (3), keeping the temperature of the dye liquor at 95 ℃, and carrying out ultrasonic-assisted dyeing with the ultrasonic power of 800W, the frequency of 50kHz, the dyeing temperature of 95 ℃, the bath ratio of 1: 20, dyeing for 5 hours, removing after dyeing, drying, controlling the water content to be between 10 and 20 percent to obtain a dyed veneer, supplementing the dyeing solution to 20L, sampling and detecting the concentration A of the dyeing solution 1 Dye uptake ═ A 0 -A 1 )/A 0 *100％。
Example 3
The remaining production process remains unchanged, with the difference from example 1:
step (4), dyeing process: and (3) caging the standby veneer in the step (2), immersing the standby veneer in the dye liquor prepared in the step (3), keeping the temperature of the dye liquor at 95 ℃, and carrying out ultrasonic-assisted dyeing, wherein the ultrasonic power is 1000W, the frequency is 50kHz, the dyeing temperature is 95 ℃, the bath ratio is 1: 20, dyeing for 4 hours, removing after dyeing, drying, controlling the water content to be between 10 and 20 percent to obtain a dyed veneer, supplementing the dyeing solution to 20L, sampling and detecting the concentration A of the dyeing solution 1 Dye uptake ═ A 0 -A 1 )/A 0 *100％。
Example 4
The remaining production process remains unchanged, differing from example 2 in that:
step (4) dyeing workerThe method comprises the following steps: and (3) after the standby veneer in the step (2) is caged, immersing the veneer in the dye liquor prepared in the step (1), keeping the temperature of the dye liquor at 95 ℃, and using ultrasonic to assist dyeing, wherein the ultrasonic power is 1000W, the frequency is 50kHz, the dyeing temperature is 95 ℃, the bath ratio is 1: 20, dyeing for 4 hours, removing after dyeing, drying, controlling the water content to be between 10 and 20 percent to obtain a dyed single plate, supplementing the dyeing solution to 20L, sampling and detecting the concentration A of the dyeing solution 1 Dye uptake ═ A 0 -A 1 )/A 0 *100％。
Comparative example 1
Preparing a dyed veneer: rotary cutting African white phoenix tree into 270 × 215 × 0.75mm single boards, selecting several single boards, and controlling water content at 8-30% for use.
Step (2) dye liquor preparation: weighing 10g of blue monoazo metal complex acid dye, uniformly dissolving the blue monoazo metal complex acid dye in a dye vat with the water amount of 20L and the temperature of 95 ℃, sampling, and detecting the concentration A of a dye solution by using an ultraviolet spectrophotometer 0 。
Step (3), dyeing process: and (3) after the standby veneer in the step (1) is caged, immersing the standby veneer in the dye liquor prepared in the step (2), keeping the temperature of the dye liquor at 95 ℃, and carrying out a bath reaction in a bath ratio of 1: and (5) 20, removing after dyeing for 6 hours, drying, and controlling the water content to be between 10 and 20 percent to obtain the dyed veneer. After the dye liquor is supplemented to 20L, sampling is carried out to detect the concentration A of the dye liquor 1 Dye uptake ═ A 0 -A 1 )/A 0 *100％。
And (4) detecting the recombined decorative veneer: and (3) carrying out light fastness detection on the dyed veneer prepared in the step (3) according to a method in GB/T28998-.
Comparative example 2
The remaining production process remains unchanged, differing from example 1 in that:
step (3) dye liquor preparation: blue monoazo metal complex acid dye (10g), Na 2 SO 4 (2g) NaCl (1.5g), fatty alcohol-polyoxyethylene ether (4g) and sodium dodecyl benzene sulfonate (4 g). The preparation method comprises the following steps: the monoazo metal complex acid dye and the fatty alcohol-polyoxyethylene ether are firstly added in the total amount of 20L, in a dye vat with the temperature of 80 ℃, stirring for 5min, and after completely dissolving, sequentially adding Na according to parts by weight 2 SO 4 NaCl and sodium dodecyl benzene sulfonate through stirring for 5-10min, sampling after the temperature is stabilized at 95 deg.c, and ultraviolet spectrophotometer to detect the dye solution concentration A 0 。
Step (4), dyeing process: and (3) after the standby veneer in the step (1) is caged, immersing the standby veneer in the dye liquor prepared in the step (2), keeping the temperature of the dye liquor at 95 ℃, and carrying out a bath reaction in a bath ratio of 1: 20, using ultrasonic to assist dyeing, wherein the ultrasonic power is 700W, the frequency is 40kHz, removing and drying after dyeing for 6h, and controlling the water content to be between 10 and 20 percent to obtain the dyed veneer. After the dye liquor is supplemented to 20L, sampling is carried out to detect the concentration A of the dye liquor 1 Dye uptake ═ A 0 -A 1 )/A 0 *100％。
Comparative example 3
The remaining production process remains unchanged, differing from comparative example 2 in that:
step (3) dye liquor preparation: dissolving 10g of monoazo metal complex acid dye into a proper amount of water to obtain a water solution, adding epoxy chloropropane, mixing, reacting at 70 ℃ for 3 hours, cooling to 25 ℃, dropwise adding a proper amount of 45 wt% NaOH water solution into the reaction product, stirring the mixture at room temperature, keeping for 3 hours, adding 50% acetic acid into the mixture to neutralize the solution, and obtaining a monoazo metal complex acid dye solution containing an active epoxy group; then, adding fatty alcohol-polyoxyethylene ether (4g) into the metal complex dye solution, adding into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and sequentially adding Na according to parts by weight after completely dissolving 2 SO 4 (2g) NaCl (1.5g) and sodium dodecyl benzene sulfonate (4g), stirring thoroughly for 5-10min, sampling after the temperature is stabilized at 95 deg.C, and detecting dye solution concentration A with ultraviolet spectrophotometer 0 。
Comparative example 4
The remaining production process remains unchanged, differing from comparative example 2 in that:
step (2) dye liquor preparation: dissolving 10g of monoazo metal complex acid dye into a proper amount of water to obtain an aqueous solution, and adding ethylene glycolMixing alcohol diglycidyl ethers, reacting for 3 hours at 70 ℃, cooling to 25 ℃, dropwise adding a proper amount of 45 wt% NaOH aqueous solution into the reaction product, stirring the mixture at room temperature and keeping for 3 hours, and adding 50% acetic acid into the mixture to neutralize the solution to obtain a monoazo metal complex acid dye solution containing active epoxy groups; then, adding fatty alcohol-polyoxyethylene ether (4g) into the metal complex dye solution, adding into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and sequentially adding Na according to parts by weight after completely dissolving 2 SO 4 (2g) NaCl (1.5g) and sodium dodecyl benzene sulfonate (4g), stirring thoroughly for 5-10min, sampling after the temperature is stabilized at 95 deg.C, and detecting dye solution concentration A with ultraviolet spectrophotometer 0 。
TABLE 1 comparison of Properties of reconstituted decorative veneers/panels
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention. Such variations and modifications are intended to fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A preparation method of a high-color-fastness recombined decorative veneer is characterized by comprising the following steps:
the method comprises the following steps of (1) soaking the rotary-cut wood veneer into mixed oxidation treatment liquid of 25-35 wt% of hydrogen peroxide, 1-2 wt% of sodium carbonate and 1-3 wt% of sodium silicate for 1-2 hours to obtain a pre-decolorized wood veneer;
bleaching the impregnated veneer obtained in the step (1) through ultraviolet radiation to obtain a secondary decolorized wood veneer;
dissolving metal complex dye into water to obtain dye solution, adding an epoxy group compound for mixing, heating for reaction for several hours, cooling to room temperature, dropwise adding 30-50 wt% of NaOH aqueous solution into the reaction product, stirring the mixture at room temperature for 2-4 hours, adding 50% of acetic acid into the mixture for neutralizing the solution, successfully grafting epoxy groups onto the metal complex dye, and finally obtaining the metal complex dye solution containing active epoxy groups;
and (4) cleaning the wood veneer obtained in the step (2) for 1-3 times by using clear water, placing the wood veneer into the metal complex dye mixed dye solution containing the active epoxy group obtained in the step (3) for ultrasonic-assisted dyeing, wherein the dyeing time is 2-8h, the dyeing temperature is 85-98 ℃, the bath ratio is 1: and (5) 20-40%, removing the dyed veneer, and drying, wherein the water content is controlled to be 10-20%.
2. The method according to claim 1, wherein the wood in the step (1) is basswood, poplar, african white phoenix tree, red oak, nice, horse oil wood, and the veneer of the rotary-cut wood has a thickness of 0.5-1.0mm and a water content of 8-30%.
3. The method as claimed in claim 1, wherein the power of the ultraviolet lamp in step (2) is 15-30W, the wavelength range is 190-400nm, and the irradiation time is 1-8 h.
4. The method according to claim 1, wherein the reaction temperature in the step (3) is 60-80 ℃ and the reaction time is 2-4 h.
5. The method according to claim 1, wherein the epoxy compound in the step (3) is epichlorohydrin, ethylene glycol diglycidyl ether, or glycerol triglycidyl ether.
6. The preparation method according to claim 1, wherein the metal complex dye mixed dye liquor in the step (4) is prepared from the metal complex dye liquor containing active epoxy groups in the step (1), Na 2 SO 4 NaCl, fatty alcohol-polyoxyethylene ether and sodium dodecyl benzene sulfonate, wherein the weight parts are 100-: 10-40: 10-25: 20-50: 10-30.
7. The preparation method according to claim 1, characterized in that, in the step (4), the metal complex dye mixed dye liquor is prepared by the following method: adding fatty alcohol-polyoxyethylene ether into metal complex dye solution containing active epoxy groups according to parts by weight, fully stirring for 5-10min, and then adding Na 2 SO 4 NaCl and sodium dodecyl benzene sulfonate are fully stirred for 5-10min to obtain the dye solution.
8. The method as claimed in claim 1, wherein the ultrasonic power in step (4) is 400-1200W, and the frequency is 20-60 kHz.
9. The method according to claim 1, wherein the metal complex dye is a monoazo metal complex acid dye.
10. The high-color-fastness recombined decorative veneer prepared by the method according to any one of claims 1 to 9.
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Cited By (1)
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| CN116352830A (en) * | 2023-02-27 | 2023-06-30 | 中国林业科学研究院木材工业研究所 | Preparation method of colored flame-retardant transparent wood |
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