Natural veneer dyeing treatment agent and treatment process thereof

Abstract

The invention discloses a natural veneer dyeing treatment agent and a treatment process thereof. The natural veneer dyeing treatment agent comprises 1-10wt% of a metal salt modified neutral dye, 1-10wt% of a metal salt modified neutral dye, and the balance of water. 0.1 to 1 wt% of aluminum-doped zinc oxide nano particles; 0.1 to 1.5 wt% of an ultraviolet light absorber; 1-20 wt% of an auxiliary agent; and the balance of deionized water. The metal salt modified neutral dye and the aluminum-doped zinc oxide nanoparticles are introduced, so that the color change of the wood veneer in a dark environment is greatly improved, and the dyeing stability is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of veneer treatment, in particular to a natural veneer dyeing treatment agent and a treatment process thereof. Background Art

[0002] Wood is mainly composed of three components: cellulose, hemicellulose and lignin, which play a key role in the structure of wood. Cellulose is the main component of wood cell walls, composed of many glucose molecules connected by β-1,4-glycosidic bonds; hemicellulose is a complex polysaccharide composed of various sugars; lignin is a complex phenolic polymer that gives wood hardness and durability.

[0003] Different types of wood have different chemical compositions and physical structures, and some woods may not fix dyes well due to compositional differences. Generally speaking, softwoods (such as pine, fir, etc.) may not be conducive to deep penetration and firm fixation of dyes due to their lower density and looser structure. These woods have thinner cell walls and larger pores, which can easily lead to too fast dye penetration and difficulty in forming a stable bond inside the wood.

[0004] If the binding force between the dye and the veneer is weak, or the dye is unevenly dispersed in the veneer, the dye may fall off or migrate under infrared light, causing discoloration.

[0005] Therefore, it is necessary to develop a natural veneer dyeing agent that can also have a good dye treatment effect in an infrared environment. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies of the prior art, the present invention provides a natural veneer dyeing treatment agent and a fading process thereof, which solve the problems raised in the above-mentioned background technology.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A natural veneer dyeing agent, comprising:

[0011] Metal salt modified neutral dye: 1-10wt%

[0012] Aluminum-doped zinc oxide nanoparticles: 0.1-1wt%

[0013] UV absorber: 0.1-1.5wt%

[0014] Additives: 1-20wt%

[0015] Deionized water: balance.

[0016] The metal salt modified neutral dye is selected from one or more of neutral orange RL, neutral red GRL, neutral gray S-BL and neutral green GL.

[0017] The preparation method of the aluminum-doped zinc oxide nanoparticles is:

[0018] Weigh zinc nitrate hexahydrate and aluminum nitrate nonahydrate, mix them in proportion, and add them into ethylene glycol solvent to form a solution;

[0019] adding a precipitant, sodium hydroxide, to precipitate zinc ions and aluminum ions together to form a hydroxide precursor;

[0020] The hydroxide precursor is subjected to a hydrothermal reaction at 150-180° C. to convert the hydroxide into AZO nanoparticles;

[0021] The reaction solution is cooled and centrifuged to obtain AZO nanoparticles, which are then washed and dried to finally obtain aluminum-doped zinc oxide nanoparticles.

[0022] The ultraviolet absorber is selected from one or more of avobenzone, diethylaminohydroxybenzoyl hexyl benzoate, disodium phenyl dibenzimidazole tetrasulfonate, ethylhexyl methoxycinnamate, phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, drometrizole trisiloxane, bis-ethylhexyloxyphenol methoxyphenyl triazine, and methylene bis-benzotriazolyl tetramethylbutylphenol.

[0023] The auxiliary agents are emulsifiers, defoamers, thickeners, pH regulators and preservatives.

[0024] The present invention also provides a veneer dyeing process, which comprises the following steps:

[0025] Clean the veneer;

[0026] Soaking treatment: Soak the natural veneer in the solution of veneer discoloration agent component A and veneer discoloration agent component B successively, and the soaking time is controlled at 5-15 hours and 15-30 hours respectively;

[0027] The veneer discoloring agent component A comprises the following components in parts by weight: 5-10 parts of sulfite discoloring agent, 6-10 parts of soluble silicate and 100 parts of deionized water;

[0028] The veneer discoloring agent component B comprises the following components by weight: 2-8 parts of carboxymethyl cellulose, 1-3 parts of acid protease, 5-15 parts of acetic acid, 2-15 parts of surfactant and 100 parts of deionized water;

[0029] After soaking, the discolorant is left on the veneer surface for 8-24 hours;

[0030] After the decolorizing agent fully reacts with the dyeing substance in the veneer, use clean water or a special cleaning agent to clean the decolorizing agent residue on the surface of the veneer, and then let the veneer dry naturally or use a drying device to accelerate the drying process to obtain a decolorized veneer;

[0031] Soaking the dried faded veneer in the veneer staining protective agent according to claim 1 and leaving it to stand for 8-24 hours;

[0032] After the veneer dyeing protective agent fully reacts with the veneer, use clean water or a special cleaning agent to clean the fading agent residue on the veneer surface, and then let the veneer dry naturally or use a drying device to accelerate the drying process to obtain protected fading veneer;

[0033] Soak the protected faded veneer in natural veneer stain treatment for 8-24 hours;

[0034] After the natural veneer dyeing agent fully reacts with the protected discolored veneer, the discolored agent residue on the surface of the veneer is cleaned with clean water or a special cleaning agent, and then the treated veneer is allowed to dry naturally or the drying process is accelerated with a drying device to obtain the dyed veneer.

[0035] The invention introduces oxazoline crosslinking agent and carboxymethyl cellulose into the veneer, and the protective film formed by crosslinking can reduce the influence of external factors such as ultraviolet rays and oxygen on the color of the veneer, and prevent the veneer from fading or yellowing during use.

[0036] The invention introduces 1-10 wt % of metal salt-modified neutral dye and 0.1-1 wt % of aluminum-doped zinc oxide nanoparticles, which greatly improves the color change of the veneer in a dark environment and ensures the stability of dyeing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a photo obtained by fading the natural wood veneer in Example 1;

[0038] Figure 2 This is a photo obtained by fading the natural wood veneer in Example 2;

[0039] Figure 3 This is a photo obtained by fading the natural veneer in Comparative Example 1;

[0040] Figure 4 This is a photo of comparative example 2 in which natural veneer was subjected to fading treatment.

[0041] Figure 5 This is a photo obtained by fading the natural veneer in Comparative Example 3. DETAILED DESCRIPTION

[0042] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] A natural veneer dyeing agent, comprising:

[0044] Metal salt modified neutral dye: 1-10wt%

[0045] Aluminum-doped zinc oxide nanoparticles: 0.1-1wt%

[0046] UV absorber: 0.1-1.5wt%

[0047] Additives: 1-20wt%

[0048] Deionized water: balance.

[0049] 1. Metal salt modified neutral dye (1-10wt%)

[0050] Function: Metal salt modified neutral dye is the main colorant responsible for providing the desired color for the veneer. Metal salt modification can enhance the light resistance, wash resistance and color fastness of the dye, ensuring that the color of the veneer after dyeing is bright and lasting. At the same time, neutral dye has good permeability and leveling, which can make the veneer dye evenly and reduce color difference.

[0051] 2. Aluminum-doped zinc oxide nanoparticles (AZO nanoparticles, 0.1-1wt%)

[0052] Function: AZO nanoparticles play two main roles in dyeing treatment agents. First, they have excellent infrared and ultraviolet absorption capabilities, and work synergistically with neutral dyes to improve dyeing stability. Second, AZO nanoparticles can also improve the wear resistance and weather resistance of veneer, increasing the service life of veneer.

[0053] 3. Ultraviolet absorber (0.1-1.5wt%)

[0054] Function: UV absorbers further enhance the veneer's resistance to UV rays. They are able to absorb UV rays and convert them into harmless heat or visible light, thus protecting the veneer from damage by UV radiation. This helps maintain the stability and beauty of the veneer's color.

[0055] 4. Additives (1-20wt%)

[0056] Emulsifier: Helps dyes and other ingredients form a stable emulsion in water, ensuring that the dye treatment can penetrate the veneer evenly and effectively.

[0057] Defoamer: Eliminate foam during preparation and application to avoid adverse effects of foam on dyeing effects and process.

[0058] Thickener: Adjusts the viscosity of the dye treatment to make it easier to handle and apply, and helps to evenly distribute the dye on the veneer surface.

[0059] pH adjuster: adjust the pH value of the dyeing agent to ensure that it works at the optimal pH, thereby improving the dyeing effect and stability.

[0060] Preservatives: Prevent dyeing agents from being contaminated and destroyed by microorganisms during storage and use, and extend their shelf life.

[0061] Veneer dyeing process

[0062] Cleaning: Ensure that the veneer surface is clean and free of impurities, providing a good foundation for subsequent processing.

[0063] Soaking and fading: The original color or bad color spots of the veneer can be effectively removed by using the two-component fading agent A and B to prepare for re-staining. The key to this step is to control the soaking time and the concentration of the fading agent to ensure that the fading effect is uniform and does not excessively damage the veneer.

[0064] Drying: Allow the faded veneer to fully dry to provide a stable base material for subsequent dyeing treatment.

[0065] Staining protection treatment: Pre-treatment with veneer staining protection agent can enhance the veneer's color absorption ability and color fastness after staining.

[0066] Dyeing treatment: Soak the faded and protected veneer in natural veneer dyeing agent to achieve re-dyeing of the veneer. The key to this step is to control the dyeing time and temperature to ensure that the dyeing effect is uniform and meets the requirements.

[0067] Cleaning and drying: After dyeing is completed, use clean water or a special cleaning agent to clean the residual dyeing agent on the surface of the veneer, and dry it again to obtain the final dyed veneer.

[0068] In the following examples and comparative examples, unless otherwise specified, the raw materials are commercially available. Parts are by weight.

[0069] Preparation method of aluminum-doped zinc oxide nanoparticles in the embodiment:

[0070] Weigh zinc nitrate hexahydrate and aluminum nitrate nonahydrate, mix them in a ratio of 1:1 between aluminum and zinc, and add them into ethylene glycol solvent to form a solution;

[0071] adding a precipitant, sodium hydroxide, to precipitate zinc ions and aluminum ions together to form a hydroxide precursor;

[0072] The hydroxide precursor is subjected to a hydrothermal reaction at 150-180° C. to convert the hydroxide into AZO nanoparticles;

[0073] The reaction solution is cooled, centrifuged to obtain AZO nanoparticles, and then washed and dried to finally obtain aluminum-doped zinc oxide nanoparticles.

[0074] Example 1

[0075] A natural veneer discoloring agent, comprising component A and component B;

[0076] The component A comprises the following components in parts by weight: 5 parts of sodium dithionite, 6 parts of sodium silicate and 100 parts of deionized water;

[0077] The B component includes the following components by weight: 2 parts of carboxymethyl cellulose (Hebei Chaoyan, model IL6, degree of substitution 0.6-0.7), 3 parts of acid protease (acid protease is purchased from the industrial grade acid protease of Hebei Jiuyu Biotechnology Co., Ltd.), 5 parts of acetic acid, 15 parts of sodium dodecyl sulfate and 100 parts of deionized water.

[0078] Components of natural veneer dyeing agent:

[0079] Antioxidant Butylated Hydroxyanisole: 1 part

[0080] UV absorber 2-(2'-hydroxy-5'-methylphenyl)benzotriazole: 1 part

[0081] Light stabilizer (hindered amine light stabilizer Tinuvin 770): 1 part

[0082] Oxazoline crosslinker 2-vinyl-2-oxazoline: 2 parts

[0083] Auxiliary agent polyoxyethylene sorbitan fatty acid ester: 2 parts

[0084] 2 parts xanthan gum

[0085] 2 parts citric acid

[0086] 2 parts of sodium benzoate

[0087] Deionized water: 87 parts

[0088] Natural veneer dyeing agent components:

[0089] Metal salt modified neutral dye neutral orange RL: 5 parts

[0090] Aluminum-doped zinc oxide nanoparticles: 1 part

[0091] UV absorber: 1 part

[0092] Polyoxyethylene sorbitan fatty acid ester: 2 parts

[0093] 2 parts xanthan gum

[0094] 2 parts citric acid

[0095] 2 parts of sodium benzoate

[0096] Deionized water: balance.

[0097] Example 2

[0098] A natural veneer discoloring agent, comprising component A and component B;

[0099] The component A comprises the following components in parts by weight: 5 parts of sodium dithionite, 6 parts of sodium silicate and 100 parts of deionized water;

[0100] The B component includes the following components by weight: 2 parts of carboxymethyl cellulose (Hebei Chaoyan, model IL6, degree of substitution 0.6-0.7), 3 parts of acid protease (acid protease is purchased from the industrial grade acid protease of Hebei Jiuyu Biotechnology Co., Ltd.), 5 parts of acetic acid, 15 parts of sodium dodecyl sulfate and 100 parts of deionized water.

[0101] Components of natural veneer dyeing agent:

[0102] Antioxidant Butyl Hydroxymetholone: ​​2 parts

[0103] UV absorber 2,4-dihydroxybenzophenone: 1.5 parts

[0104] Light stabilizer 2,2'-thiobis(p-tert-octylphenol)nickel: 1.5 parts

[0105] Oxazoline crosslinker (Dongguan Xinhua water-based environmentally friendly long-term crosslinker XH-500): 4 parts

[0106] 5 parts of polyoxyethylene sorbitan monolaurate

[0107] 2 parts sodium hydroxide

[0108] Potassium sorbate 1 part

[0109] Deionized water: 83 parts

[0110] Natural veneer dyeing agent components:

[0111] Metal salt modified neutral dye neutral gray S-BL: 4 parts

[0112] Aluminum-doped zinc oxide nanoparticles: 0.5 parts

[0113] UV absorber: 1 part

[0114] Polyoxyethylene sorbitan fatty acid ester: 2 parts

[0115] 2 parts xanthan gum

[0116] 2 parts citric acid

[0117] 2 parts of sodium benzoate

[0118] Deionized water: balance.

[0119] Comparative Example 1

[0120] Same as Example 2, without adding aluminum-doped zinc oxide nanoparticles: 0.5 parts

[0121] Comparative Example 2

[0122] Same as Example 2, adding zinc oxide nanoparticles (Xiao Huang Nano, average 20 nm): 0.5 parts, replacing aluminum-doped zinc oxide nanoparticles: 0.5 parts.

[0123] Comparative Example 3

[0124] Same as Example 2, the metal salt modified neutral dye neutral gray S-BL was replaced with Clariant acid gray M-BLA, and the fading agent was adjusted to pH 4-5 with hydrochloric acid.

[0125] In the above embodiment, the veneer treated with fading is natural veneer, the immersion time of AB component, dyeing treatment protective agent and dyeing agent is 10 hours, 20 hours, 18 hours and 18 hours respectively, the lower part of the dyed material is covered with 2 cm thick aluminum foil, and the whole material is placed under an indoor infrared lamp (1500W near infrared LED lamp, Shenzhen Azure Light, lamp beads 630:660:810:830:850nm=30:120:15:30:105) for 7 days. The experimental results are shown in Figure 1-5 .

[0126] It can be seen that the addition of aluminum-doped zinc oxide nanoparticles and metal salt-modified neutral dyes can greatly reduce the yellowing in infrared environments. The two work together to achieve a very good effect.

[0127] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A natural veneer dyeing agent, characterized in that: The natural veneer dyeing treatment agent comprises: Metal salt modified neutral dye: 1-10wt% Aluminum-doped zinc oxide nanoparticles: 0.1-1wt% UV absorber: 0.1-1.5wt% Additives: 1-20wt% Deionized water: balance.

2. A natural veneer dyeing agent according to claim 1, characterized in that: The metal salt modified neutral dye is selected from one or more of neutral orange RL, neutral red GRL, neutral gray S-BL and neutral green GL.

3. A natural veneer dyeing agent according to claim 1, characterized in that: The preparation method of the aluminum-doped zinc oxide nanoparticles is: Weigh zinc nitrate hexahydrate and aluminum nitrate nonahydrate, mix them in proportion, and add them into ethylene glycol solvent to form a solution; adding a precipitant, sodium hydroxide, to precipitate zinc ions and aluminum ions together to form a hydroxide precursor; The hydroxide precursor is subjected to a hydrothermal reaction at 150-180° C. to convert the hydroxide into AZO nanoparticles; The reaction solution is cooled and centrifuged to obtain AZO nanoparticles, which are then washed and dried to finally obtain aluminum-doped zinc oxide nanoparticles.

4. A natural veneer dyeing agent according to claim 1, characterized in that: The ultraviolet absorber is selected from one or more of avobenzone, diethylaminohydroxybenzoyl hexyl benzoate, sodium phenyl dibenzimidazole tetrasulfonate, ethylhexyl methoxycinnamate, phenylbenzimidazole sulfonic acid, terephthalylidene dicamphor sulfonic acid, drometrizole trisiloxane, bis-ethylhexyloxyphenol methoxyphenyl triazine, and methylene bis-benzotriazolyl tetramethylbutylphenol.

5. A natural veneer dyeing agent according to claim 1, characterized in that: The auxiliary agents are emulsifiers, defoamers, thickeners, pH regulators and preservatives.

6. A veneer dyeing process, characterized in that: The process comprises the following steps: Clean the veneer; Soaking treatment: Soak the natural veneer in the solution of veneer discoloration agent component A and veneer discoloration agent component B successively, and the soaking time is controlled at 5-15 hours and 15-30 hours respectively; The veneer discoloring agent component A comprises the following components in parts by weight: 5-10 parts of sulfite discoloring agent, 6-10 parts of soluble silicate and 100 parts of deionized water; The veneer discoloring agent component B comprises the following components by weight: 2-8 parts of carboxymethyl cellulose, 1-3 parts of acid protease, 5-15 parts of acetic acid, 2-15 parts of surfactant and 100 parts of deionized water; After soaking, the discolorant is left on the veneer surface for 8-24 hours; After the decolorizing agent fully reacts with the dyeing substance in the veneer, use clean water or a special cleaning agent to clean the decolorizing agent residue on the surface of the veneer, and then let the veneer dry naturally or use a drying device to accelerate the drying process to obtain a decolorized veneer; Soaking the dried faded veneer in the veneer staining protective agent according to claim 1 and leaving it to stand for 8-24 hours; After the veneer dyeing protective agent fully reacts with the veneer, use clean water or a special cleaning agent to clean the fading agent residue on the veneer surface, and then let the veneer dry naturally or use a drying device to accelerate the drying process to obtain protected fading veneer; Soak the protected faded veneer in natural veneer stain treatment for 8-24 hours; After the natural veneer dyeing agent fully reacts with the protected discolored veneer, the discolored agent residue on the surface of the veneer is cleaned with clean water or a special cleaning agent, and then the treated veneer is allowed to dry naturally or the drying process is accelerated with a drying device to obtain the dyed veneer.

7. A veneer dyeing process according to claim 6, characterized in that: The veneer dyeing treatment agent comprises: Antioxidant: 1-3wt% UV absorber: 0.5-2wt% Light stabilizer: 0.5-1.5wt% Oxazoline crosslinker: 2-5wt% Additives: 1-20wt% Deionized water: balance The oxazoline cross-linking agent is a compound containing an oxazoline group.

8. A veneer dyeing process according to claim 6, characterized in that: The natural veneer dyeing treatment agent comprises: Metal salt modified neutral dye: 1-10wt% Aluminum-doped zinc oxide nanoparticles: 0.1-1wt% UV absorber: 0.1-1.5wt% Auxiliary agent: 1-20wt% Deionized water: balance

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