Preparation method of water-based wood wax oil

Abstract

The invention discloses a preparation method of water-based wood wax oil, which comprises the following steps: S1, adding water-based acrylic resin into a container, stirring at a rotating speed of 400-500r / min, heating to 35-40 DEG C, sequentially and slowly adding modified wood flour, carnauba wax, hand feeling wax slurry and water-based anti-settling wax while stirring, and continuously stirring until the materials are uniformly mixed; wherein epoxy resin is attached to wood grain holes of the modified wood powder through vacuumizing; the water-based wax oil is applied to the surface of wood, and the anti-tarnishing layer with the breathable structure is obtained after drying; according to the invention, the epoxy resin modified wood flour is introduced, and the wood flour not only can provide breathing holes for the water-based wax oil, but also can remove lignin, so that a color-changing structure is reduced, and meanwhile, the problems of cracking, falling and color changing are solved.

Description

Technical Field

[0001] The invention relates to the technical field of water-based wood wax oil, and in particular to a preparation method and application of water-based wood wax oil. Background Art

[0002] Wood wax oil is an environmentally friendly product suitable for wooden and rattan products. According to the different components, wood wax oil is divided into oily wood wax oil and water-based wood wax oil.

[0003] Oily wood wax oil is composed of natural plant oil and plant wax. It is easy to apply and friendly to human health and the environment. The combination of oily wood wax oil and wood mainly relies on penetration rather than film formation. The oil component can penetrate into the interior of the wood, and the wax component is firmly combined with the wood fiber. Since there is no paint film, the wood can exchange humidity through the pores, which can realize the free "breathing" of the wood and maintain the balance of the water content of the wood. It will not rot due to water accumulation, nor will it cause the wood to expand and shrink due to water loss, thereby improving the stability of the wood. In addition, good air permeability can also allow some aromatic substances in the wood to be slowly released through the pores, creating a natural and fresh indoor environment, which is very beneficial for the finishing of some high-end nanmu and sandalwood furniture. Its disadvantages are poor shielding effect, heavy taste, high price, and easy to rot and borers.

[0004] Water-based wood wax oil is a wood protection coating based on water-based technology. It uses water as a solvent and the film-forming substance is a water-dispersible resin. After the water evaporates, a protective film is formed on the surface of the wood, which has a certain protective effect. It is widely used because of its advantages such as environmental protection, maintaining the natural texture of wood, and having a certain wear resistance. Because wood wax oil forms a protective film on the surface of wood, it is easy to crack and fall off. When used outdoors, wood often changes color. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing water-based wood wax oil. The present invention introduces wood powder modified with epoxy resin, which can provide "breathing" pits for the water-based wood wax oil and remove lignin, thereby reducing discoloration structure and solving the problems of cracking, falling off and discoloration.

[0006] To solve this technical problem, the technical solution of the present invention is: a method for preparing water-based wood wax oil, comprising the following steps: S1. Add water-based acrylic resin into a container, stir at a speed of 400-500r / min, heat to 35-40°C, slowly add modified wood powder, carnauba wax, hand wax slurry, and water-based anti-settling wax in sequence while stirring, and continue stirring until the mixture is evenly mixed; The wood grain pores of the modified wood powder are attached with epoxy resin by vacuuming; S2. Increase the speed to 600-700r / min, add deionized water while stirring, and stir for about 30 minutes; S3. Adjust the speed to 400-500r / min, add wetting dispersant, defoaming agent and defoaming agent in sequence, and continue stirring until the mixture is evenly mixed; S4. Adjust the speed to 600-700r / min, add thickener and drying agent while stirring, and then change the speed to 900-1000r / min to disperse for 30-40min; S5. Adjust the speed to 600-700r / min, add ammonia neutralizer while stirring, and adjust the pH value to between 8-9, i.e. the target water-based wood wax oil; The water-based wood wax oil is applied to the wood surface, and after drying, an anti-discoloration layer with a breathable structure is obtained.

[0007] The method for preparing the modified wood flour preferably comprises the following steps: S11, immersing the decolorized wood block in an epoxy resin solution, taking it out, and placing it in a vacuum machine to repeatedly evacuate the oxygen in the wood, so that the epoxy resin fills into the wood block pores; In step S11, vacuuming is performed 3 to 4 times, and the duration of each vacuuming is 50 minutes; S12, then transferring the wood to a dryer for drying, and grinding the dried wood into powder.

[0008] The present invention utilizes a decolorization method to remove the Preferably, the method for preparing the decolorized wood block in S11 comprises the following steps: S111, cutting wood into blocks; S112, putting the wood block into a decolorizing solution, heating it, so that the color of the wood block deepens, taking out the wood block, and washing it with distilled water; S113, adding hydrogen peroxide to the decolorizing solution in S112, heating the wood block after S112 again, stopping heating when the color turns white, and washing with distilled water; S114, washing and drying, thus obtaining a wood block from which lignin has been removed.

[0009] Preferably, the thickness of the wood block in step S111 is 5 mm to 10 mm.

[0010] The method for preparing the decolorizing solution in step S112 is preferably as follows: Put 200 ml of distilled water in a beaker and then add 50 g of sodium hydroxide, stir until fully dissolved, then add 25 g of sodium sulfite, stir until dissolved, and obtain a decolorizing solution. The present invention utilizes sodium hydroxide and sodium sulfite as strong reducing agents to reduce the pigment in the wood to a colorless substance.

[0011] Preferably, in step S113, 20 ml of a 12% hydrogen peroxide solution is added to the decolorizing solution in step S112. The addition of sodium hydroxide to the decolorizing solution of the present invention can adjust the pH of the decolorizing solution to 10 to 11, accelerate the decomposition of hydrogen peroxide, generate more active oxygen, and thus improve the decolorizing effect.

[0012] Preferably, a transparent epoxy resin is weighed, heated to 60-80°C, a silane coupling agent is added while stirring, and after stirring for 20 minutes, nano zinc oxide is added, stirring is continued until uniform, an ultraviolet absorber is added, stirring is continued at 60-80°C for 50 minutes, and the epoxy resin solution for coating wood powder is obtained by cooling to room temperature. In the present invention, the silane coupling agent is KH550, and the function of the silane coupling agent is to help the nano zinc oxide to be evenly dispersed in the epoxy resin and enhance the stability of the epoxy resin solution. One end of the silane coupling agent is connected to the nano zinc oxide to reduce the surface tension of the nano material, and the other end is connected to the epoxy resin to form a stable dispersion system, thereby ensuring that the zinc oxide particles are evenly distributed with the wood powder particles, effectively absorbing ultraviolet light and maintaining the original pits of the wood powder, and maintaining the breathing of the base wood.

[0013] Preferably, the epoxy resin solution comprises the following substances in terms of mass fraction: Epoxy resin 76%; UV absorber 6%; Nano zinc oxide 8%; Silane coupling agent 10%.

[0014] The present invention uses nano zinc oxide to prevent mold. In the present invention, epoxy resin participates in film formation, and the obtained film layer not only retains breathing holes but also ensures uniform formation of the film layer.

[0015] The preferred aqueous wood wax oil includes the following substances by mass fraction: Water-based acrylic resin 68%; Modified wood flour 10%; Carnauba wax 8%; Hand wax paste 2%; Deionized water 7%; Defoaming agent 0.2%; Ammonia neutralizer 0.4%; Wetting agent 0.1%; Defoaming agent 0.3%; Water-based anti-settling wax 3.2%; Thickener 0.5%; Drier 0.3%.

[0016] Preferably, the film-forming and curing of the anti-discoloration layer comprises the following steps: A1. Use 400-grit sandpaper to polish the substrate to be painted; A2. Dilute the water-based wood wax oil with 5%-10% water before painting and stir evenly; A3, brushing, brushing thickness 0.30mm, drying, to obtain an anti-discoloration layer with a breathable structure.

[0017] The anti-discoloration layer with a breathable structure prepared by the present invention introduces wood powder modified by epoxy resin into water-based wood wax oil, keeps the wood powder pores connected to the humidity and temperature of the external environment, keeps the moisture content of the wood balanced, and neither rots due to water accumulation nor causes the wood to expand and shrink due to water loss, thereby improving the stability of the wood, thereby avoiding the bursting and shedding of the film layer formed by the water-based wood wax oil; the ultraviolet and visible light irradiation depth is 0.075-0.25mm, and the present invention controls the thickness of the anti-discoloration layer, and uses the ultraviolet light absorber in the anti-discoloration layer to reduce the influence of ultraviolet light on wood discoloration. Wood contains chemical substances such as tannins, flavonoids, lignin and phenols. Among them, flavonoids, lignin and phenols are the main chemical components that cause wood to develop color and discolor. When used outdoors, under the irradiation of ultraviolet rays and visible light, the discoloration structure on the surface of the wood undergoes certain photodegradation, causing the wood to discolor, especially lignin, in which the α-carbonyl group acts as a photosensitizer and is the main color-emitting structure. Therefore, the wood powder in the anti-discoloration layer of the present invention is effectively decolorized, and the base wood maintains color stability due to the protection of the anti-discoloration layer.

[0018] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: the present invention adds modified wood powder to the water-based wood wax oil, the modified wood powder can not only provide "breathing" pits for the water-based wood wax oil but also remove lignin, and the modified wood powder is evenly distributed in the film layer and the discoloration structure is reduced, while solving the problems of cracking, falling off and discoloration. DETAILED DESCRIPTION

[0019] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0020] Example 1

[0021] This embodiment discloses a method for preparing water-based wood wax oil, comprising the following steps: S1. Add water-based acrylic resin into a container, stir at a speed of 400-500r / min, heat to 35-40°C, slowly add modified wood powder, carnauba wax, hand wax slurry, and water-based anti-settling wax in sequence while stirring, and continue stirring until the mixture is evenly mixed; S2. Increase the speed to 600-700r / min, add deionized water while stirring, and stir for about 30 minutes; S3. Adjust the speed to 400-500r / min, add wetting dispersant, defoaming agent and defoaming agent in sequence, and continue stirring until the mixture is evenly mixed; S4. Adjust the speed to 600-700r / min, add thickener and drying agent while stirring, and then change the speed to 900-1000r / min to disperse for 30-40min; S5. Adjust the speed to 600-700r / min, add ammonia neutralizer while stirring, and adjust the pH value to between 8-9, i.e. the target water-based wood wax oil; The amounts of the above substances are shown in Table 1.

[0022] The water-based wood wax oil is applied to the wood surface, and after drying, an anti-discoloration layer with a breathable structure is obtained.

[0023] The film-forming and curing of the anti-discoloration layer includes the following steps: A1. Use 400-grit sandpaper to polish the substrate to be painted; A2. Dilute the water-based wood wax oil with 5%-10% water before painting and stir well; A3. Apply with a thickness of 0.10-0.30 mm and dry to obtain an anti-discoloration layer with a breathable structure.

[0024] The preparation method of modified wood powder in this embodiment comprises the following steps: S11, immersing the decolorized wood block in an epoxy resin solution, taking it out, and placing it in a vacuum machine to repeatedly evacuate the oxygen in the wood, so that the epoxy resin fills into the wood block pores; In step S11, vacuuming is performed 3 to 4 times, and the duration of each vacuuming is 50 minutes; S12, then transferring the wood to a dryer for drying, and grinding the dried wood into powder.

[0025] The preparation method of the decolorized wood block in S11 in this embodiment comprises the following steps: S111, cutting wood into wood blocks, the cutting thickness is shown in Table 1; S112, putting the wood block into a decolorizing solution, heating it, so that the color of the wood block deepens, taking out the wood block, and washing it with distilled water; The preparation method of the decolorizing solution in step S112 is as follows: Put 200 ml of distilled water into a beaker and then add 50 g of sodium hydroxide, stir until fully dissolved, then add 25 g of sodium sulfite and stir until dissolved to obtain a decolorizing solution.

[0026] S113, add 20 ml of 12% hydrogen peroxide solution to the decolorizing solution in S112, heat the wood block after S112 again, stop heating when the color turns white, and wash with distilled water; S114, washing and drying, thus obtaining a wood block from which lignin has been removed.

[0027] In this embodiment, a transparent epoxy resin is weighed, heated to 60-80°C, a silane coupling agent is added while stirring, and after stirring for 20 minutes, nano zinc oxide is added, and stirring is continued until uniform. An ultraviolet absorber is added, and stirring is continued at 60-80°C for 50 minutes. The epoxy resin solution for coating wood powder is obtained after cooling to room temperature.

[0028] In this embodiment, the epoxy resin solution includes the following substances according to mass fraction: Epoxy resin 76%; UV absorber 6%; Nano zinc oxide 8%; Silane coupling agent 10%.

[0029] In this embodiment, the water-based wood wax oil includes the following substances by mass fraction: Water-based acrylic resin 68%; Wood flour 10%; Carnauba wax 8%; Hand wax paste 2%; Deionized water 7%; Defoaming agent 0.2%; Ammonia neutralizer 0.4%; Wetting agent 0.1%; Defoaming agent 0.3%; Water-based anti-settling wax 3.2%; Thickener 0.5%; Drier 0.3%.

[0030] Example 2

[0031] The main difference between this embodiment and embodiment 1 is shown in the preparation method of the modified wood powder, which is shown in Table 2.

[0032] Example 3

[0033] The main difference between this embodiment and embodiment 1 is shown in the preparation method of the modified wood powder, which is shown in Table 2.

[0034] Example 4

[0035] The main difference between this embodiment and embodiment 1 is shown in the preparation method of the modified wood powder, which is shown in Table 2.

[0036] Example 5

[0037] The main difference between this embodiment and embodiment 1 is shown in the preparation method of the modified wood powder, which is shown in Table 2.

[0038] Example 6

[0039] The main difference between this embodiment and embodiment 1 is shown in the preparation method of the modified wood powder, which is shown in Table 2.

[0040] Table 1 Preparation process and parameters of modified wood flour in Examples 1 to 6

[0041] The film properties of the water-based wood wax oil obtained in Examples 1 to 6 and the comparative example were tested respectively as shown in Table 2. The drying time of the paint film was tested with reference to the "Determination of Drying Time of Paint Film and Putty Film" (GB / T 1728-1979), wherein the surface drying time was measured by the blowing cotton ball method, and the actual drying time was measured by the pressing cotton ball method. The hardness of the paint film was tested using a QHQ type coating pencil scratch hardness tester with reference to the "Determination of Paint Film Hardness by Pencil Method for Paints and Varnishes" (ISO 15184-2012), and each sample was tested in parallel 3 times. The adhesion of the paint film was measured using a QFH paint film cross-cutting instrument with reference to the "Scratch Test for Paints and Varnishes" (ISO 2409-2013). The cross-cutting instrument was used to cross-cut in a direction of 45° to the texture of the substrate, and the adhesion grade of the sample was determined according to the standard. Each sample was tested in parallel 3 times. The color of the substrate before and after coating was quantitatively tested using an SP60 spectrophotometer using the International Commission on Illumination CIE standard colorimetric system, L * Indicates brightness, a * Indicates red and green, b * Indicates yellow-blue color, ΔL * , Δa * and Δb * L after and before painting * 、a * and b * ΔE is the total color difference, according to ΔE = (ΔL *2 + Δa *2 + Δb *2 ) 1 / 2 Calculation. The smaller the total color difference value, the smaller the color change of the substrate before and after coating. The UV irradiation conditions are: UV lamp wavelength 254nm, UV lamp height from the specimen is 150mm, irradiation time is 96 hours. The process conditions of hot and cold cycles are as follows: hot and cold cycle test temperature range is -40℃ to 85℃; humidity range is 10% to 90%RH, 5000 hot and cold cycles.

[0042] Table 2 Performance indicators of the anti-discoloration layers obtained in Examples 1 to 6

[0043] Combining Table 1 and Table 2, it can be seen that the anti-discoloration layers obtained in Example 3, Example 5, and Example 6 all meet the use requirements. In Example 3, the thickness of the board is 7mm, and the water-based wood wax oil made of wood powder obtained when the number of vacuuming times is 3 times has the best performance. The anti-discoloration layers obtained in Example 1, Example 2, and Example 4 all cracked during the hot and cold cycle. Comparing Example 3 and Example 4, both use 7mm boards. As the number of vacuuming times increases, the amount of epoxy resin filled into the wood powder pores increases, and the pores of the wooden board are filled. Due to the high hardness of epoxy resin, the hardness obtained is improved, but the breathing effect of the pores cannot be exerted during the hot and cold cycle, so the cracking and its ability to resist hot and cold cycles decrease. Under the premise of the same number of vacuuming times, as the thickness of the wood increases, the filling amount of epoxy resin and nano zinc oxide decreases, and the ability to resist hot and cold cycles is improved, but its hardness and antibacterial effect are reduced. The substrates coated with an anti-discoloration layer obtained in Example 4 and the comparative example were placed outdoors for 6 months from August of the previous year to January of the next year. The test piece obtained in Example 4 had basically no color change, no cracking, no falling off, and no mildew; the test piece obtained in the comparative example had a slight color change, partial cracking, no falling off, and partial mildew at the edges and corners.

Claims

1. A method for preparing an aqueous wood wax oil, characterized in that: The following steps are involved: S1. Add water-based acrylic resin into a container, stir at a speed of 400-500r / min, heat to 35-40°C, slowly add modified wood powder, carnauba wax, hand wax slurry, and water-based anti-settling wax in sequence while stirring, and continue stirring until the mixture is evenly mixed; wherein the wood grain pores of the modified wood powder are attached with epoxy resin by vacuuming; S2. Increase the speed to 600-700r / min, add deionized water while stirring; S3. Adjust the speed to 400-500r / min, add wetting dispersant, defoaming agent and defoaming agent in sequence, and continue stirring until the mixture is evenly mixed; S4. Adjust the speed to 600-700r / min, add thickener and drying agent while stirring, and then change the speed to 900-1000r / min to disperse for 30-40min; S5. Adjust the speed to 600-700r / min, add ammonia neutralizer while stirring, and adjust the pH value to between 8-9, i.e. the target water-based wood wax oil; The water-based wood wax oil is applied to the wood surface, and after drying, an anti-discoloration layer with a breathable structure is obtained.

2. The preparation method according to claim 1, characterized in that: The preparation method of modified wood powder comprises the following steps: S11, immersing the decolorized wood block in an epoxy resin solution, taking it out, and placing it in a vacuum machine to repeatedly evacuate the oxygen in the wood, so that the epoxy resin fills into the wood block pores; In step S11, vacuuming is performed 3 to 4 times, and the duration of each vacuuming is 50 minutes; S12, then transferring the wood to a dryer for drying, and grinding the dried wood into powder.

3. The preparation method according to claim 2, characterized in that: The preparation method of the decolorized wood block in S11 comprises the following steps: S111, cutting wood into blocks; S112, putting the wood block into a decolorizing solution, heating it, so that the color of the wood block deepens, taking out the wood block, and washing it with distilled water; S113, adding hydrogen peroxide to the decolorizing solution in S112, heating the wood block after S112 again, stopping heating when the color turns white, and washing with distilled water; S114, washing and drying, thus obtaining a wood block from which lignin has been removed.

4. The preparation method according to claim 3, characterized in that: The thickness of the wood block in step S111 is 5 mm to 10 mm.

5. The preparation method according to claim 3, characterized in that: The preparation method of the decolorizing solution in step S112 is as follows: Put 200 ml of distilled water into a beaker and then add 50 g of sodium hydroxide, stir until fully dissolved, then add 25 g of sodium sulfite and stir until dissolved to obtain a decolorizing solution.

6. The preparation method according to claim 4, characterized in that: In step S113, 20 ml of a hydrogen peroxide solution with a mass fraction of 12% is added to the decolorizing solution in step S112.

7. The preparation method according to claim 2, characterized in that: Weigh a transparent epoxy resin, heat it to 60-80°C, add a silane coupling agent while stirring, stir for 20 minutes, add nano zinc oxide, continue stirring until uniform, add an ultraviolet absorber, stir at 60-80°C for 50 minutes, and cool to room temperature to obtain an epoxy resin solution for coating wood powder.

8. The preparation method according to claim 7, characterized in that: The epoxy resin solution includes the following substances in terms of mass fraction: Epoxy resin 76%; UV absorber 6%; Nano zinc oxide 8%; Silane coupling agent 10%.

9. The preparation method according to claim 1, characterized in that: Water-based wood wax oil includes the following substances by mass fraction: Water-based acrylic resin 68%; Modified wood flour 10%; Carnauba wax 8%; Hand wax paste 2%; Deionized water 7%; Defoaming agent 0.2%; Ammonia neutralizer 0.4%; Wetting agent 0.1%; Defoaming agent 0.3%; Water-based anti-settling wax 3.2%; Thickener 0.5%; Drier 0.3%.

10. The preparation method according to claim 1, characterized in that: The film-forming and curing of the anti-discoloration layer includes the following steps: A1. Use 400-grit sandpaper to polish the substrate to be painted; A2. Dilute the water-based wood wax oil with 5%-10% water before painting and stir evenly; A3. Apply with a thickness of 0.10-0.30 mm and dry to obtain an anti-discoloration layer with a breathable structure.

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