CN114953075B - 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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- CN114953075B CN114953075B CN202210498971.8A CN202210498971A CN114953075B CN 114953075 B CN114953075 B CN 114953075B CN 202210498971 A CN202210498971 A CN 202210498971A CN 114953075 B CN114953075 B CN 114953075B
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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 recombined decorative veneer with high color fastness, which relates to a method for improving the color fastness of the recombined decorative veneer, and belongs to the technical field of recombined decorative material dyeing, and the method specifically comprises the following steps: step (1), placing a wood veneer in the mixed oxidation treatment liquid for soaking and pre-decoloring; step (2), performing secondary decolorization treatment on the pre-decolorized wood veneer by using high-energy ray radiation; and (3) dyeing the decolored veneer obtained in the step two by using the metal complex dye after chemical modification under the assistance of ultrasonic waves. The method enhances the binding force of the metal complex dye and the wood while ensuring the structural strength of the wood veneer, 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 made up by using wood of ordinary tree species as raw material, using the wood of ordinary tree species as raw material, making veneer by rotary cutting or planing, and adopting the technological processes of colour mixing, gluing and assembling, compression moulding and forming, etc. to obtain the invented wood decorative material with the characteristics of colour, pattern and texture of wood of natural and precious tree species or other artistic patterns. 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 change to different degrees, namely the recombined decorative veneer is easy to fade and change color, the decorative aesthetic property is influenced, and the wide application of the recombined decorative veneer on veneers such as 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, so that the color of the wood veneer becomes light, the color difference is reduced, and 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 lignin structure not only causes the bleached veneer to distort and deform after drying, but also affects the compression molding and the decorative pattern aesthetic degree of the dyed veneer; meanwhile, the veneer structure is loose, so that the veneer usage amount is increased, and the production cost of the recombined decorative veneer is greatly increased. The method for bleaching the wood veneer disclosed by CN 106625952B utilizes bacterial liquid to decompose lignin in the wood, and achieves the purpose of bleaching, but has larger damage to the veneer structure, and has complex steps and is difficult to realize in actual production and application. In the bleaching method for wood veneers disclosed by CN 105082287A, the bleaching agent is compounded by hydrogen peroxide, hydrochloric acid, sodium carbonate, ammonia water, ammonium fluosilicate and the like, the components are complex, the environmental pollution is easy to aggravate, the volatile substances are more, the respiratory tract is easy to stimulate after long-term contact, and the health of a human body is endangered. Therefore, a method for purposefully removing chromophoric groups in lignin and maintaining the skeleton structure of lignin is needed to be designed, so that the method is simple and convenient to implement, and can be used for bleaching wood veneers quickly and cleanly.
Furthermore, the type and structure of the dye have a great influence on the color fastness of the reassembled decorative veneer. The metal complex dye structure contains hydroxyl ligand, and can form a stable structure with excellent light resistance through complexing with metal ions, but the metal complex dye structure and wood fiber are combined mainly through weak binding force such as hydrogen bond, van der Waals force and the like, so that the light fastness of dyed wood is low (3.5 to 4.0), and the advantages of high light fastness (6.0 to 7.5) of the metal complex dye are not fully exerted, so that the metal complex dye structure needs to be chemically modified, the reactivity of the metal complex dye structure and hydroxyl on the wood is improved, and metal complex dye molecules are combined with the wood structure through covalent bonds with strong stability, so that the light fastness of dyed wood is improved. Thus, the hydroxyl groups in the metal complex dye molecule can be used to graft with the epoxy group-containing compound to form a dye structure containing reactive epoxy groups. When the wood is dyed, epoxy groups on the metal complex dye subjected to chemical modification can react with hydroxyl groups of the wood to form covalent bonds, so that stable bonding of the metal complex dye and wood components is realized, and the light fastness of the recombined decorative veneer is improved.
In addition, CN 111633771A discloses a method for improving dyeing efficiency and light fastness of recombined decorative materials, which comprises puffing wood by microwave puffing technology to obtain a larger internal channel structure, so as to improve permeability of metal complex dye in the wood. Although the microwave puffing technology can increase and expand the pore canal penetrated by the dye liquor to a certain extent, the quantity and the size of the pore canal of the treated wood veneer cannot be accurately controlled, so that the uneven pore canal of the microwave puffed wood can also cause different dye uptake of dye molecules, the even dyeing effect after the wood is dyed is poor, and the uneven fading phenomenon of the dyed veneer can be more serious due to inconsistent dye uptake of each area. Thus, there is a need to improve the permeability and leveling of dyes inside wood. The ultrasonic technology can enable the dye to quickly and uniformly permeate into the wood veneer through mechanical action, cavitation and thermal action, so that the production efficiency is improved, and the dyeing effect is improved.
In summary, the invention aims to provide a preparation method of a high-color-fastness recombined decorative veneer, which is used for purposefully removing chromophores in lignin in veneer bleaching to block the photochromic phenomenon of lignin in wood veneer caused by photooxidation of chromophores; the metal complex dye grafted with epoxy groups reacts with wood hydroxyl groups to form stable chemical bonding, so that the interaction between the metal complex dye and the wood hydroxyl groups is improved; the ultrasonic technology is adopted to promote the efficient and uniform penetration of the metal complex dye in the wood. Finally, the preparation method of the recombined decorative veneer with high speed, simplicity, convenience, high efficiency, low consumption and high light fastness is formed.
Disclosure of Invention
In view of the problems existing in the existing high-color-fastness recombined decorative veneer preparation technology, the problems of loose wood veneer structure, lower binding force between metal complex dye and wood, poor permeability and the like caused by bleaching treatment are solved. The invention provides a treatment technology for removing a wood chromophoric group, enhancing chemical bonding between dye and wood and physically dredging a dye permeation channel. The high-efficiency penetration of dye is realized while the structure and mechanical strength of the wood veneer are ensured, and a feasible technology is provided for manufacturing the recombined decorative veneer with high color fastness. The technology can improve the color fastness of the full-color system recombined decorative veneer, especially improves the light fastness of the light-color system recombined decorative veneer when the dye is low in 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, comprising the steps of:
step (1) dipping the rotary-cut wood veneer in mixed oxidation treatment liquid of 25-35wt% of hydrogen peroxide, 1-2wt% of sodium carbonate and 1-3wt% of sodium silicate for 1-2 hours to obtain a pre-decolorized wood veneer;
step (2) bleaching the impregnated veneer obtained in the step (1) through ultraviolet radiation to obtain a bleached wood veneer;
dissolving a metal complex dye into water to obtain a dye solution, adding an epoxy group compound for mixing, heating and reacting for a plurality of hours, then cooling to room temperature, dropwise adding 30-50wt% of NaOH aqueous solution into the reactant, stirring the mixture at room temperature and keeping the mixture for 2-4 hours, adding 50% of acetic acid into the mixture to neutralize the solution, and grafting the epoxy group onto the metal complex dye to finally obtain the metal complex dye solution containing active epoxy groups;
step (4) cleaning the wood veneer obtained in the step (2) for 1-3 times by using clear water, placing the wood veneer in a metal complex dye mixed dye solution containing active epoxy groups for ultrasonic auxiliary dyeing for 2-8 hours at the dyeing temperature of 85-98 ℃ and the bath ratio of 1:20-40, removing the dyed veneer and drying, and controlling the water content to be 10-20%.
In some embodiments, the wood in step (1) is basswood, poplar, african Bai Wutong, red oak, nice, ma Youmu, the thickness of the veneer of rotary cut wood is 0.5-1.0mm, and the moisture content is 8-30%.
In some embodiments, the concentration of hydrogen peroxide in the step (1) is 25-35wt%, the concentration of sodium carbonate solution is 1-2wt%, the concentration of sodium silicate solution is 1-3wt%, and the soaking is performed for 1-2h.
In some embodiments, the ultraviolet lamp power in step (2) is 15-30W, the wavelength range is 190-400nm, and the irradiation time is 1-8h.
In some embodiments, the reaction temperature in step (3) is 60-80 ℃ and the reaction time is 2-4 hours.
In some embodiments, the epoxy group compound in step (3) is epichlorohydrin, ethylene glycol diglycidyl ether, glycerol triglycidyl ether.
In some embodiments, the metal complex dye mixed dye solution in the step (4) is prepared from the metal complex dye solution containing the active epoxy group in the step (1), na 2 SO 4 The composition comprises, by weight, 100-120 parts of NaCl, fatty alcohol polyoxyethylene ether and sodium dodecyl benzene sulfonate: 10-40:10-25:20-50:10-30 parts.
In some embodiments, the method for preparing the metal complex dye mixed dye solution in the step (4) comprises the following steps: adding fatty alcohol polyoxyethylene ether into the metal complex dye solution containing active epoxy groups according to weight parts, fully stirring for 5-10min, and then adding Na 2 SO 4 Stirring NaCl and sodium dodecyl benzene sulfonate for 5-10min to obtain the dye liquor.
In some embodiments, the ultrasonic power in step (4) is 400-1200W and the frequency is 20-60kHz.
Compared with common dyes, the metal complex dye has the characteristic of high light fastness, and the metal complex dye is combined with wood fibers mainly through weak binding force such as hydrogen bond, van der Waals force and the like, so that the dyed wood veneer has lower color fastness, and meanwhile, the dye liquor permeability is also poor. NaCl is used as a leveling agent, so that the metal complex dye can uniformly dye the veneer. Na (Na) 2 SO 4 As a color fixing agent, reacts with the water-based group for crosslinking, so as to achieve the effect of fixing dye molecules on the recombined decorative veneer.
In some embodiments, the metal complex dye is a monoazo type metal complex acid dye.
Compared with the prior art, the gain effect of the invention comprises: :
(1) The method for bleaching the wood veneer is quick, simple, green, low in energy consumption and easy to implement, removes the chromophoric group in the lignin, blocks the photochromic phenomenon caused by photooxidation of the chromophoric group of the lignin, and obtains better bleaching effect without damaging the structural strength of the wood.
(2) And (3) performing epoxy group compound grafting modification on the metal complex dye structure, using the metal complex dye with water solubility to replace common acid dye, and performing grafting on hydroxyl groups in molecules of the metal complex dye and the epoxy group compound to form a dye structure containing active epoxy groups, and then reacting the dye structure with hydroxyl groups of wood to form a covalent bond, thereby improving the light fastness of the recombined decorative veneer.
(3) Under the combined action of ultrasonic physical assistance and dyeing auxiliary chemical assistance, the dissolubility and the penetrability of the dye are improved, the dyeing efficiency is improved, and the light fastness grade of the light-colored dyed veneer is not lower than 4.5 grade when the dyeing amount is lower.
Detailed Description
Example 1
Step (1) wood bleaching treatment: placing the African Bai Wutong 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 25wt%, the concentration of the sodium carbonate solution is 1wt%, and the concentration of the sodium silicate solution is 1wt%, and soaking for 1h; then radiating the treated veneer with 15W ultraviolet light for 1h;
step (2) preparation of dyed veneers: the karaya africana is cut into 270X 215X 0.75mm single plates, and a plurality of single plates are selected, and the water content is controlled to be 8-30% for standby.
And (3) preparing a dye liquor: dissolving 10g of metal complex dye into a proper amount of water to obtain an aqueous solution, adding epichlorohydrin for mixing, reacting for 3 hours at 70 ℃, then cooling to 25 ℃, dropwise adding a proper amount of 45wt% NaOH aqueous solution into the reactant, stirring the mixture at room temperature, keeping for 3 hours, and adding 50% acetic acid into the mixture to neutralize the solution to obtain monoazo metal complex acid dye solution containing active epoxy groups; then, adding fatty alcohol polyoxyethylene ether (4 g) into the metal complex dye solution, and adding the fatty alcohol polyoxyethylene ether into the total amount20L, stirring for 5min in a dye vat at 80 ℃, and adding Na according to weight parts after complete dissolution 2 SO 4 (2g) NaCl (1.5 g) and sodium dodecyl benzene sulfonate (4 g), stirring for 5-10min, sampling after the temperature is stabilized at 95deg.C, and detecting dye liquor concentration A with ultraviolet spectrophotometer 0 。
And (4) dyeing: immersing the standby veneer in the step (2) into the dyeing liquid prepared in the step (3) after the standby veneer is put into a cage, keeping the temperature of the dyeing liquid at 95 ℃, using ultrasonic to assist dyeing, wherein the ultrasonic power is 800W, the frequency is 50kHz, the dyeing temperature is 95 ℃, and the bath ratio is 1:20, dyeing for 5h, removing after dyeing, drying, controlling the water content to be between 10 and 20 percent to obtain dyed veneers, supplementing 20L of dye liquor, and sampling to detect the concentration A of the dye liquor 1 Dye uptake= (a) 0 -A 1 )/A 0 *100％。
Detecting the recombined decorative veneer in the step (5): and (3) detecting the light fastness of the dyed veneer prepared in the step (4) according to the method in GB/T28998-2012 recombinant decorative materials, wherein other indexes meet the standard requirements.
Example 2
The rest of the production process remains unchanged, differing from example 1 in that:
and (3) preparing a dye liquor: dissolving 10g of monoazo metal complex acid dye into a proper amount of water to obtain an aqueous solution, adding ethylene glycol diglycidyl ether for mixing, reacting for 3 hours at 70 ℃, then cooling to 25 ℃, dropwise adding a proper amount of 45wt% NaOH aqueous solution into the reactant, stirring the mixture at room temperature, keeping for 3 hours, and adding 50% acetic acid into the mixture to neutralize the solution to obtain monoazo metal complex acid dye solution containing active epoxy groups; then adding fatty alcohol polyoxyethylene ether (4 g) into the metal complex dye liquor, firstly adding the metal complex dye liquor into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and after the metal complex dye liquor is completely dissolved, sequentially adding Na according to parts by weight 2 SO 4 (2g) NaCl (1.5 g) and sodium dodecyl benzene sulfonate (4 g), stirring for 5-10min, sampling after the temperature is stabilized at 95deg.C, and detecting dye liquor concentration A with ultraviolet spectrophotometer 0 。
And (4) dyeing: immersing the standby veneer in the step (2) into the dyeing liquid prepared in the step (3) after the standby veneer is put into a cage, keeping the temperature of the dyeing liquid at 95 ℃, using ultrasonic to assist dyeing, wherein the ultrasonic power is 800W, the frequency is 50kHz, the dyeing temperature is 95 ℃, and the bath ratio is 1:20, dyeing for 5h, removing after dyeing, drying, controlling the water content to be between 10 and 20 percent to obtain dyed veneers, supplementing 20L of dye liquor, and sampling to detect the concentration A of the dye liquor 1 Dye uptake= (a) 0 -A 1 )/A 0 *100％。
Example 3
The rest of the production process remains unchanged, differing from example 1 in that:
and (4) dyeing: immersing the standby veneer in the step (2) into the dyeing liquid prepared in the step (3) after the standby veneer is put into a cage, keeping the temperature of the dyeing liquid at 95 ℃, using ultrasonic to assist dyeing, wherein the ultrasonic power is 1000W, the frequency is 50kHz, the dyeing temperature is 95 ℃, and 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 dyed veneers, supplementing 20L of dye liquor, and sampling to detect the concentration A of the dye liquor 1 Dye uptake= (a) 0 -A 1 )/A 0 *100％。
Example 4
The rest of the production process remains unchanged, differing from example 2 in that:
and (4) dyeing: immersing the standby veneer in the step (2) into the dyeing liquid prepared in the step (1) after loading in a cage, keeping the temperature of the dyeing liquid at 95 ℃, using ultrasonic to assist dyeing, wherein the ultrasonic power is 1000W, the frequency is 50kHz, the dyeing temperature is 95 ℃, and 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 dyed veneers, supplementing 20L of dye liquor, and sampling to detect the concentration A of the dye liquor 1 Dye uptake= (a) 0 -A 1 )/A 0 *100％。
Comparative example 1
Step (1) preparation of dyed veneers: the karaya africana is cut into 270X 215X 0.75mm single plates, and a plurality of single plates are selected, and the water content is controlled to be 8-30% for standby.
And (2) preparing a dye liquor: weighing 10g of blue monoazo metal complex acid dye, uniformly dissolving in a dye vat with water quantity of 20L and temperature of 95 ℃, sampling, and detecting dye liquor concentration A by an ultraviolet spectrophotometer 0 。
And (3) dyeing: immersing the standby veneer in the step (1) into the dye liquor prepared in the step (2) after loading the standby veneer in a cage, and keeping the temperature of the dye liquor at 95 ℃ and the bath ratio of 1:20, removing after dyeing for 6 hours, drying, and controlling the water content between 10 and 20 percent to obtain the dyed veneer. And the dye liquor is supplemented to 20L and then sampling is carried out to detect the dye liquor concentration A 1 Dye uptake= (a) 0 -A 1 )/A 0 *100％。
Detecting the recombined decorative veneer in the step (4): and (3) detecting the light fastness of the dyed veneer prepared in the step (3) according to the method in GB/T28998-2012 recombinant decorative materials, wherein other indexes meet the standard requirements.
Comparative example 2
The rest of the production process remains unchanged, differing from example 1 in that:
and (3) preparing a dye liquor: blue monoazo metal complex acid dye (10 g), na 2 SO 4 (2g) NaCl (1.5 g), fatty alcohol polyoxyethylene ether (4 g) and sodium dodecyl benzene sulfonate (4 g). The preparation method comprises the following steps: adding monoazo metal complex acid dye and fatty alcohol polyoxyethylene ether into a dye vat with total amount of 20L and temperature of 80 ℃, stirring for 5min, adding Na according to weight parts in sequence after complete dissolution 2 SO 4 Stirring with NaCl and sodium dodecyl benzene sulfonate for 5-10min, sampling after temperature is stabilized at 95deg.C, and detecting dye liquor concentration A with ultraviolet spectrophotometer 0 。
And (4) dyeing: immersing the standby veneer in the step (1) into the dye liquor prepared in the step (2) after loading the standby veneer in a cage, and keeping the temperature of the dye liquor at 95 ℃ and the bath ratio of 1:20, using ultrasonic to assist dyeing, using ultrasonic power of 700W and frequency of 40kHz, removing and drying after dyeing for 6 hours, and controlling the water content to be between 10 and 20 percent to obtain the dyed veneer. And the dye liquor is supplemented to 20L and then sampling is carried out to detect the dye liquor concentration A 1 Dye uptake =(A 0 -A 1 )/A 0 *100％。
Comparative example 3
The rest of the production process remains unchanged, and differs from comparative example 2 in that:
and (3) preparing a dye liquor: dissolving 10g of monoazo metal complex acid dye into a proper amount of water to obtain an aqueous solution, adding epichlorohydrin, mixing, reacting for 3 hours at 70 ℃, then cooling to 25 ℃, dropwise adding a proper amount of 45wt% NaOH aqueous solution into the reactant, stirring the mixture at room temperature, keeping for 3 hours, adding 50% acetic acid into the mixture, and neutralizing the solution to obtain monoazo metal complex acid dye solution containing active epoxy groups; then adding fatty alcohol polyoxyethylene ether (4 g) into the metal complex dye liquor, firstly adding the metal complex dye liquor into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and after the metal complex dye liquor is completely dissolved, sequentially adding Na according to parts by weight 2 SO 4 (2g) NaCl (1.5 g) and sodium dodecyl benzene sulfonate (4 g), stirring for 5-10min, sampling after the temperature is stabilized at 95deg.C, and detecting dye liquor concentration A with ultraviolet spectrophotometer 0 。
Comparative example 4
The rest of the production process remains unchanged, and differs from comparative example 2 in that:
and (2) preparing a dye liquor: dissolving 10g of monoazo metal complex acid dye into a proper amount of water to obtain an aqueous solution, adding ethylene glycol diglycidyl ether for mixing, reacting for 3 hours at 70 ℃, then cooling to 25 ℃, dropwise adding a proper amount of 45wt% NaOH aqueous solution into the reactant, stirring the mixture at room temperature, keeping for 3 hours, and adding 50% acetic acid into the mixture to neutralize the solution to obtain monoazo metal complex acid dye solution containing active epoxy groups; then adding fatty alcohol polyoxyethylene ether (4 g) into the metal complex dye liquor, firstly adding the metal complex dye liquor into a dye vat with the total amount of 20L and the temperature of 80 ℃, stirring for 5min, and after the metal complex dye liquor is completely dissolved, sequentially adding Na according to parts by weight 2 SO 4 (2g) NaCl (1.5 g) and sodium dodecyl benzene sulfonate (4 g), stirring for 5-10min, sampling after the temperature is stabilized at 95deg.C, and detecting dye liquor concentration A with ultraviolet spectrophotometer 0 。
TABLE 1 comparison of the Performance of recombined decorative veneers/materials
The foregoing has shown and described the basic principles, principal 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 foregoing embodiments, which are described in the foregoing description merely illustrative of the principles of the invention, and various changes and modifications can be made 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 (8)
1. The preparation method of the recombined decorative veneer with high color fastness is characterized by comprising the following steps of:
step (1) immersing the rotary-cut wood veneer in a mixed solution of hydrogen peroxide, sodium carbonate and sodium silicate, wherein the concentration of the hydrogen peroxide is 25-35wt%, the concentration of the sodium carbonate solution is 1-2wt%, the concentration of the sodium silicate solution is 1-3wt%, and the immersing time is 1-2 hours, so as to obtain a pre-decolorized wood veneer;
step (2) bleaching the impregnated veneer obtained in the step (1) through ultraviolet radiation to obtain a secondary decolorized wood veneer;
dissolving a metal complex dye into water to obtain a dye solution, adding an epoxy group compound for mixing, heating and reacting for a plurality of hours, then cooling to room temperature, dropwise adding 30-50wt% NaOH aqueous solution into the reactant, stirring the mixture at room temperature, keeping 2-4h, adding 50% acetic acid into the mixture to neutralize the solution, and successfully grafting the epoxy group onto the metal complex dye, thereby finally obtaining the metal complex dye solution containing active epoxy groups; the epoxy group compound in the step (3) is epichlorohydrin;
step (4) cleaning the wood veneer obtained in the step (2) with clear water for 1-3 times, placing the wood veneer in the metal complex dye mixed dye solution containing the active epoxy groups obtained in the step (3) for ultrasonic auxiliary dyeing, wherein the ultrasonic power is 1000W, the frequency is 50kHz, the dyeing time is 2-8h, the dyeing temperature is 85-98 ℃, and the bath ratio is 1:20-40, removing the dyed veneer and drying, and controlling the water content to be 10-20%.
2. The method according to claim 1, wherein the wood in the step (1) is basswood, poplar, african Bai Wutong, red oak, nice, ma Youmu, and the thickness of the veneer of rotary cut wood is 0.5-1.0mm, and the water content is 8-30%.
3. The method according to claim 1, wherein the ultraviolet lamp power in the step (2) is 15-30W, the wavelength range is 190-400nm, and the irradiation time is 1-8h.
4. The method according to claim 1, wherein the reaction temperature in the step (3) is 60 to 80 ℃ and the reaction time is 2 to 4h.
5. The method according to claim 1, wherein the metal complex dye mixed dye solution in the step (4) is prepared from the metal complex dye solution containing the active epoxy group in the step (3), na 2 SO 4 The composition comprises, by weight, 100-120 parts of NaCl, fatty alcohol polyoxyethylene ether and sodium dodecyl benzene sulfonate: 10-40:10-25:20-50:10-30 parts.
6. The method according to claim 1, wherein the method for preparing the metal complex dye mixed dye solution in the step (4) comprises the following steps: adding fatty alcohol polyoxyethylene ether into the metal complex dye solution containing active epoxy groups according to weight parts, and fully stirringStirring for 5-10min, and adding Na 2 SO 4 Stirring NaCl and sodium dodecyl benzene sulfonate for 5-10min to obtain the dye liquor.
7. The method according to claim 1, wherein the metal complex dye is monoazo metal complex acid dye.
8. The high-color-fastness recombined decorative veneer prepared by the method according to any one of claims 1 to 7.
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