Two-component wood fading agent and use method thereof

Abstract

The invention belongs to the technical field of fading and bleaching, and relates to a two-component wood fading agent, which comprises the following components in parts by mass: a component A: 400-500 parts of hydrogen peroxide, 100-200 parts of water and 3-5 parts of phosphoric acid; the component B comprises 500-600 parts of hydrogen peroxide, 30-40 parts of water, 4-6 parts of ammonia water and 10-12 parts of sodium silicate; and a functional modifier. The invention also discloses a use method of the fading agent. The color of organic molecular substances in the color fading chemical reaction can be oxidized to fade, and the wood cellulose has no effect, so that the wood color fading agent has the characteristics of high color fading reaction speed, no reversibility and the like, is particularly suitable for wood color fading, is very ideal in effect, simple in color fading process, low in cost and free of pollution, and does not corrode wood. The surface of the wood floor is faded, the utilization rate of low-grade wood is increased, meanwhile, the faded process meets batch production, the floor surface is enriched, the current aesthetic needs of the public are met, and the manufactured floor is environmentally friendly, good in color durability and capable of meeting the performance requirements of various aspects under the floor heating condition.

Description

Technical Field

[0001] The invention belongs to the technical field of fading and bleaching, relates to a fading agent, and in particular to a two-component wood fading agent and a use method thereof. Background Art

[0002] The double color difference on the wood surface will lead to a lower grade of wood and reduce the economic benefits of the manufacturer. The existing wood fading method is to soak the wood in a bleaching powder solvent for steaming and bleaching, but the efficiency is low and it is easy to crack; the second is to apply bleach on the surface of the wood, which has low production efficiency and is difficult to meet the needs of large-scale mass production operations. The above two treatment methods will cause color difference after fading for a long time, that is, a reversible reaction occurs, making the final fading effect unsatisfactory.

[0003] The invention patent with the announcement number CN 113601649 B discloses a wood discoloring agent and a discoloring process, which provides a wood floor discoloring agent, which includes 60-95% of a main agent, 5-10% of ethanol or oxalic acid, and the balance of water by volume; the main agent includes the following components by volume: 70-78% of a decoloring agent, 0.5-1.2% of an active enzyme auxiliary agent, 6-20% of a penetrant, 3-5% of a surfactant, and 6-9% of a water-based anti-cracking agent. By adding a decoloring agent as the main discoloring component to the main agent, a large amount of ammonia and hydrogen peroxide is avoided while meeting the bleaching capacity, and the safety and environmental protection of discoloring are improved, and an active enzyme auxiliary agent that can promote discoloring efficiency, a penetrant that can improve the penetration of the discoloring agent, a surfactant that acts on the surface of the board, and a water-based anti-cracking agent that prevents the board from cracking are added, thereby greatly improving the discoloring ability of the discoloring agent.

[0004] The invention with application number CN2020100523527 provides a solid wood floor discoloration process, including the following steps: discoloration step: after the wood board is polished, the discoloration agent is evenly applied to the surface of the wood board, and the temperature is kept constant for more than 24 hours; the discoloration agent is a mixture of ammonia water, ferrous sulfate, potassium permanganate, caustic soda and water, and the mass ratio is 1:1:6:1:4; fading step: the discoloration agent is evenly applied to the surface of the wood board treated by the above steps, and the temperature is kept constant for more than 24 hours; the discoloration agent is a mixture of hydrogen peroxide, lime water and water, and the mass ratio is 1:1:1; coating step: the wood board treated by the fading step is polished and polished, and then natural oil and wood wax oil are applied on the surface of the wood board, and dried and solidified. The solid wood floor discoloration process method of the present invention has a simple process and good discoloration effect, solves the problem of color difference in high-end floor wood itself, and improves the added value of the product.

[0005] Application number CN112265098A is a method for preparing a chemical color-changing composite floor, comprising the following steps:

[0006] Step 1: fade the two-color or discolored wood veneer, and obtain A veneer after drying; Step 2: impregnate the A veneer with a modifier, and obtain B veneer after drying; Step 3: coat the B veneer with a discoloring agent, and obtain C veneer after drying; Step 4: press the C veneer; Step 5: post-process to obtain chemical discoloration solid wood floor; wherein the modifier contains modified polyamide polyamine epichlorohydrin resin, and the modified polyamide polyamine epichlorohydrin resin is prepared by embedding diamine into the polyamide main chain and modifying it with epichlorohydrin. The processing technology for processing wood with two-color or discoloration defects provided by the present invention makes the prepared composite board have high mechanical strength, good stability, and good coloring effect, greatly improves the quality grade of the wood, and has a wide range of application and good application prospects.

[0007] Application No. CN201810650721.5 discloses a method for manufacturing a light-proof discoloration wooden floor, wherein the preparation process of the surface board includes the following steps in sequence: stacking single boards, with a single board layer spacing of 2mm to 3mm, a horizontal air flow channel between every 4 or 5 single board layers, and a vertical air flow channel between every 9 or 10 single board rows; heat treatment of the single boards, heat treatment of the single boards at a temperature of 140℃ to 150℃ in a heat treatment kiln, and the highest temperature insulation time is 3h to 4h. h; cooling of single board, passing atomized water to reduce the temperature in the heat treatment kiln; fading treatment, when the temperature in the heat treatment kiln drops to 80±2℃~85±2℃, add sodium hydroxide solution to the passing atomized water, the concentration of sodium hydroxide solution is 18%~20%, and the amount of sodium hydroxide solution added in 1L atomized water is 300g~400g; leaving the kiln, when the temperature in the kiln drops to 50℃~55℃, stop passing atomized water, and leave the kiln after naturally cooling to room temperature; adjust the moisture content; make the board to size and make the surface board. Avoid slow discoloration and color difference of the floor, and the floor decoration effect is long-lasting. Summary of the invention

[0008] In order to overcome the defects of the prior art, the object of the present invention is to provide a wood discoloring agent.

[0009] Technical Solution

[0010] A wood discoloring agent, comprising component A, component B and a functional modifier, wherein, by weight,

[0011] The component A contains 400-500 parts of hydrogen peroxide, preferably 450 parts; 100-200 parts of water, preferably 150 parts; and 3-5 parts of phosphoric acid, preferably 4 parts;

[0012] The component B comprises 500-600 parts of hydrogen peroxide, preferably 550 parts; 30-40 parts of water, preferably 35 parts; 4-6 parts of ammonia, preferably 5 parts; and 10-12 parts of sodium silicate, preferably 11 parts.

[0013] The functional modifier is a mixture of component A and component B in equal proportions, and includes: stabilizer 0.5-3%, preferably 2%; penetrant 1-5%, preferably 3%; nano silicone resin 0.5-

[0014] 1.5%, preferably 1%.

[0015] The stabilizer has the effect of slowing down the chemical reaction speed, slowing down the excessive damage to the wood, and improving the appearance quality of the floor; the penetrant has the effect of moistening the wood, reducing the surface tension of the wood, strengthening the penetration, improving the permeability of the bleaching liquid to the wood, and increasing the bleaching depth of the wood; the nano-silicone resin has the effect of waterproofing and crack prevention, and increases the stability of the floor in the floor heating environment. The stabilizer and penetrant are both commonly used compound substances in the field of wood processing.

[0016] When using, apply 40-50g / ㎡ of coating evenly on the wood surface to be faded. The fading process will be completed in 3 to 5 days. The length of time can be adjusted according to the temperature in different seasons.

[0017] The second object of the present invention is to disclose a method for using the above two-component wood discoloring agent, comprising the following steps:

[0018] A. Mix component A and component B in a mass ratio of 1:1, add the functional modifier, stir evenly, and set aside;

[0019] B. Apply evenly on the wood surface with a roller at a coating amount of 40-50g / ㎡;

[0020] C. Drying by infrared at 70-90℃ for 10s-2min, so that the chemical reagents in the wood decolorizer react with the wood colored substances such as tannic acid;

[0021] D. Timber stacking and health preservation;

[0022] E. Lightly sand the wood surface with sandpaper and clean it for subsequent processing.

[0023] In a preferred disclosed example of the present invention, in step B, a sponge roller or a rubber roller is used for roller coating. When a rubber roller is used, the coating amount is 20 to 30 g / m2 depending on the color of the substrate.

[0024] In a preferred disclosed example of the present invention, in step C, the drying time is 1 min.

[0025] In a preferred disclosed example of the present invention, in step D, the curing time is 3 to 5 days, the temperature is 30 to 45° C., and the curing end point is 6 to 8% of the equilibrium moisture content of the wood.

[0026] Furthermore, in the hot summer season, the stacked materials can be cured at room temperature for 3 days.

[0027] According to the disclosed method of use, the fading treatment is performed on the surface of the plain board of the wooden floor, and the effect is obvious.

[0028] The main components of wood cell walls are cellulose, hemicellulose and lignin. Cellulose and hemicellulose do not absorb visible light and exist as a matrix. Lignin is the main color-developing substance. Its basic structural unit is phenylpropane. The benzene ring, quinones and the carbonyl (-C=O) and carboxyl (-COOH) groups of its monomer side chains all contain chromophores with carbon-carbon and carbon-oxygen conjugated double bond structures, which are the main source of wood color. In addition, the hydroxyl (-OH) and methoxy (-OCH 3 ), although colorless in itself, is very easy to degrade under the action of light and oxygen, making the color of wood darker, which is called auxochrome. The fading process of wood is to use chemical reagents to oxidize and reduce the surface of wood, destroy the chromogenic group and auxochrome group in the wood, so that it will fade and whiten.

[0029] Redox bleaching mechanism: when the chemical reagent decomposes, free radicals are generated to attack the pigment conjugated system, thereby changing the structure and number of the chromophore group to achieve a fading effect.

[0030] The reaction mechanism is generally considered to be as follows:

[0031] H 2 O 2 →HO 2 - +H +

[0032] HO 2 - →O 2 - +H + ;

[0033] The chain termination reaction caused by free radicals is:

[0034] HO - +HO 2 - →H 2 O+O 2

[0035] HO 2 - +HO 2 - →H 2 O 2 +O 2

[0036] HO 2 - + Unbleached Wood → OH - + Faded wood.

[0037] Beneficial Effects

[0038] In the chemical reaction of the present invention, all organic molecular substances can be oxidized to fade, but the wood cellulose itself has no effect. It has the characteristics of fast fading reaction speed and irreversibility. It is particularly suitable for fading wood, with ideal effect, simple fading process, low cost, no pollution, and no corrosion to wood. The present invention also improves the utilization rate of low-grade wood by improving the fading process of the wooden floor surface. At the same time, the fading process meets the requirements of batch production and enriches the floor surface, meeting the current aesthetic needs of the public. The manufactured floor is environmentally friendly and has good color durability, meeting various performance requirements under floor heating conditions. Chemical reagents are used to oxidize and reduce the wood surface, destroy the chromophores and auxochromes in the wood, and produce fading and whitening effects. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the embodiments so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0040] Example 1

[0041] When used, prepare component A and component B according to the mass ratio, wherein component A weighs the following raw materials by mass: 400 parts of hydrogen peroxide, 100 parts of water, 4 parts of phosphoric acid, and mixes them evenly; component B weighs the following raw materials by mass: 500 parts of hydrogen peroxide, 30 parts of water, 5 parts of ammonia water, 10 parts of sodium silicate, and mixes them evenly. Then mix component A and component B in a mass ratio of 1:1, add 0.5% stabilizer, 1.5% penetrant, and 1.0% nano-silicon resin, stir evenly, and use a sponge roller to evenly roll on the surface of the wood to be faded at a coating amount of 40-45g / ㎡. The chemical reagents in the wood decolorizer react chemically with the colored substances in the wood, and the fading process can be completed after 3 days.

[0042] Example 2

[0043] When used, prepare component A and component B according to the mass ratio, wherein component A weighs the following raw materials by mass: 500 parts of hydrogen peroxide, 200 parts of water, 5 parts of phosphoric acid, and mixes them evenly; component B weighs the following raw materials by mass: 600 parts of hydrogen peroxide, 40 parts of water, 6 parts of ammonia water, 12 parts of sodium silicate, and mixes them evenly. Then mix component A and component B in a mass ratio of 1:1, add 0.7% stabilizer, 1.0% penetrant, and 0.5% nano-silicon resin, stir evenly, and use a rubber roller to evenly roll it on the surface of the wood to be faded according to the coating amount of 22-25g / ㎡. The chemical reagents in the wood decolorizer react chemically with the colored substances in the wood, and the fading process can be completed after 5 days.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wood discoloring agent, comprising component A, component B and a functional modifier, characterized in that: By mass, The component A contains 400-500 parts of hydrogen peroxide, 100-200 parts of water, and 3-5 parts of phosphoric acid; The component B comprises 500-600 parts of hydrogen peroxide, 30-40 parts of water, 4-6 parts of ammonia water, and 10-12 parts of sodium silicate; The functional modifier is a mixture of component A and component B in equal proportions, and includes 0.5-3% stabilizer, preferably 2%; 1-5% penetrant, preferably 3%; and 0.5-1.5% nano-silicone resin, preferably 1%.

2. The wood discoloring agent according to claim 1, characterized in that: 450 parts of hydrogen peroxide in component A.

3. The wood discoloring agent according to claim 1, characterized in that: The water in component A is 150 parts.

4. The wood discoloring agent according to claim 1, characterized in that: 4 parts of phosphoric acid in component A.

5. The wood discoloring agent according to claim 1, characterized in that: 550 parts of hydrogen peroxide in component B.

6. The wood discoloring agent according to claim 1, characterized in that: 35 parts of water in component B.

7. The wood discoloring agent according to claim 1, characterized in that: 5 parts of ammonia water in component B.

8. The wood discoloring agent according to claim 1, characterized in that: 11 parts of sodium silicate in component B.

9. A method for using the wood discoloring agent according to any one of claims 1 to 8, characterized in that: The steps include: A. Mix component A and component B in a mass ratio of 1:1, add the functional modifier, stir evenly, and set aside; B. Apply evenly on the wood surface with a roller at a coating amount of 40-50g / ㎡; C. Infrared drying at 70-90℃ for 10s-2min allows the chemical reagents in the wood decolorizer to react with wood colored substances such as tannic acid; D. Timber stacking and curing; E. Lightly sand the wood surface with sandpaper and clean it for subsequent processing.

10. The method for using the wood discoloring agent according to claim 9, characterized in that: In step B, a sponge roller or a rubber roller is used for roller coating. When a rubber roller is used, the coating amount is 20 to 30 g / m2 depending on the color of the substrate.