A multi-effect finishing structure and finishing method for a wood-based panel

Abstract

The application discloses a multi-effect veneering structure of artificial board and a veneering method, and comprises the following steps: cleaning the surface of the artificial board to remove surface impurities, drying, and removing surface water stains; completely immersing the dried artificial board in an ethanol solution, taking out the artificial board, cleaning again, and drying; completely immersing the dried artificial board in an isopropyl alcohol solution for catalytic treatment to form a dendritic structure, and cleaning and drying; and thus a new arrangement mode is formed, and the anti-cracking property and the water resistance of the artificial board are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of artificial board facing, in particular to a multi-effect artificial board facing structure and a facing method. BACKGROUND

[0002] Artificial board is a board or molded product made of wood or other non-wood plants as raw material, after certain mechanical processing and separation into various unit materials, with or without adhesive and other additives. It mainly includes plywood, particle board and fiber board, and its extension products and deep processing products reach hundreds of varieties. The birth of artificial board marks the beginning of the modernization of wood processing, which develops from simply changing the shape of wood to improving the properties of wood. This development not only involves the whole wood processing technology, but also needs to absorb the technology in the fields of textile and papermaking, thus forming an independent processing technology. The advantages of artificial board include large area, good structure, convenient construction, low expansion and contraction rate, stable size and light weight. Artificial board materials are various, and commonly used are particle board, medium density board, cabinet board (large core board), plywood and decorative artificial board such as fireproof board. These different types of artificial board materials each have their own characteristics and purposes, for example, particle board is cut into certain specifications from the leftover materials, wood chips and the like in the wood processing process, and is made into a kind of artificial board material after drying, mixing glue, hardening agent, waterproof agent and other processes. It has uniform structure and good processing performance, and can be processed into large area board according to needs, which is a good raw material for making furniture of different specifications and styles. Medium density fiber board is a kind of artificial board made of wood or plant fibers by mechanical separation and chemical treatment, mixed with adhesive and waterproof agent, and then formed by high temperature and high pressure. Its structure is more uniform than natural wood, avoiding problems such as decay and insect damage, and it has small expansion and contraction, which is convenient for processing. However, the existing technology mainly uses adhesive and high pressure treatment to press the powder into a plywood, but the plywood prepared by this method has poor connection and is easy to crack.

[0003] In summary, artificial board is an important building material and furniture manufacturing material, and its application field is wide. Different types of board have their own specific performance and purpose, which can be selected according to actual needs. SUMMARY

[0004] The present application overcomes the shortcomings of the prior art and provides a multi-effect artificial board facing structure and a facing method.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a multi-effect artificial board facing structure and a facing method, comprising the following steps:

[0006] S1: cleaning the surface of the artificial board to remove surface impurities, drying and removing surface water stains;

[0007] S2: completely immerse the dried artificial board of S1 in an ethanol solution, take out the artificial board, clean again, and dry;

[0008] S3: completely immerse the dried artificial board of S2 in an isopropanol solution for catalytic treatment to form a dendritic structure, clean, and dry.

[0009] In a preferred embodiment of the present application, in S1, the cleaning is performed using a plant extraction cleaner, and the pH is 5-7.

[0010] In a preferred embodiment of the present application, in S1, the drying parameters are as follows: the temperature is 50-80℃, the humidity is 10%rh, the drying time is 8-12 hours, and the air flow rate is 0.5-2m / s.

[0011] In a preferred embodiment of the present application, in S2, the soaking time is 30-60min, the ethanol concentration is 60-95%rh, and the temperature is 23-25℃.

[0012] In a preferred embodiment of the present application, in S2, the cleaning is performed using a soap cleaner for scrubbing, and the drying parameters are the same as those in S1.

[0013] In a preferred embodiment of the present application, in S3, the isopropanol concentration is 60-95%rh, and the soaking time is 60-120min.

[0014] In a preferred embodiment of the present application, in S3, the cleaning is performed using clean water for rinsing, and the drying parameters are the same as those in S1.

[0015] A decorative structure of a multi-effect decorative method for artificial boards, comprising: a connecting layer:

[0016] The connecting layer is a dendritic structure, which is formed by the reaction of ethanol and isopropanol, and the dendritic structure randomly forms a special-shaped structure.

[0017] In a preferred embodiment of the present application, the connecting layer is further provided with a barrier layer; and the barrier layer is mainly formed of an acrylic copolymer.

[0018] The present application solves the defects in the background art, and has the following beneficial effects:

[0019] (1) The present application provides a multi-effect veneer structure and veneer method for artificial boards, which is processed by the mutual treatment between the mixed solution of ethanol and isopropanol and the treatment of acrylic copolymer, so that when the cellulose molecules in the artificial board are interacted by ethanol and isopropanol, the intermolecular hydrogen bond will be rearranged to form a dendritic structure, at the same time, the acrylic copolymer is combined with the components such as cellulose microfibers in the cell wall to form a three-dimensional network structure to wrap the original dendritic structure, compared with the prior art, the present application changes the relative position and orientation of the molecules caused by the dendritic structure, thereby forming a new arrangement, which not only improves the anti-cracking shape of the artificial board, but also improves the water resistance of the artificial board.

[0020] (2) The present application provides a multi-effect veneer structure and veneer method for artificial boards, which is processed by the mixed solution of ethanol and isopropanol, so that the oxygen atom on the hydroxyl group in the cellulose molecules in the artificial board can form a hydrogen bond with the hydrogen atom in the adjacent molecules, thereby connecting the molecules together, causing the cross-linking and polymerization between the molecules, and forming a dendritic-like crystalline structure. This structure can improve the hardness and durability of the artificial board, and make the surface more beautiful.

[0021] (3) The present application provides a multi-effect veneer structure and veneer method for artificial boards, which is processed by acrylic copolymer, and the acrylic copolymer penetrates into the interior of the wood cells and chemically combines with the cellulose microfibers in the cell wall to form a three-dimensional network structure to wrap the original dendritic microfiber structure, and a protective film is formed around the dendritic structure, which plays a role in blocking water from entering the interior of the dendritic structure. Since the absorption of water in the interior of the dendritic structure is reduced, the water resistance of the artificial board is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor;

[0023] Figure 1 is a perspective view of the preferred embodiment of the present application. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0025] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can be practiced in other ways different from those described herein, therefore, the protection scope of the present application is not limited to the specific embodiments disclosed below.

[0026] As shown in the drawings, a kind of artificial board multi-effect finishing structure and finishing method, including: Figure 1 As shown in the drawings, a kind of artificial board multi-effect finishing structure and finishing method, including:

[0027] S1: cleaning the surface of artificial board, removing surface impurities, drying, removing surface water stains;

[0028] S2: the dried artificial board of S1 is completely soaked in ethanol solution, the artificial board is taken out, cleaned again, and dried;

[0029] S3: the dried artificial board of S2 is completely soaked in isopropanol solution for catalytic treatment, forms dendritic structure, and is cleaned and dried.

[0030] In a preferred embodiment of the present application, in S1, cleaning is carried out using plant extraction cleaner, and the pH is 5-7;The drying parameters are that the temperature is 50-80℃, the humidity is 10%rh, the drying time is 8-12 hours, and the air flow rate is 0.5-2m / s.

[0031] It should be noted that the plant extraction cleaner is mainly extracted from natural plants such as orange peel and lemon peel, which can effectively clean grease stains and has good cleaning effect, can effectively remove dirt, dust and impurities on the surface of artificial board, and at the same time, the plant extraction cleaner has good protection effect on wood fiber, which can avoid excessive mechanical force or chemical corrosion on artificial board in the cleaning process, so as to maintain the natural texture and texture of artificial board.

[0032] In a preferred embodiment of the present application, in S2, the soaking time is 30-60min, the ethanol concentration is 60-95%rh, and the temperature is 23-25℃.

[0033] In a preferred embodiment of the present application, in S2, the cleaning is carried out by using soap cleaner for scrubbing, and the drying parameters are the same as those in S1.

[0034] It is important to note that both ethanol and isopropanol are organic solvents, which can interact with the components on the surface of the wood-based panel, such as resin and turpentine. During the ethanol soaking stage, ethanol molecules will penetrate the surface of the wood-based panel and dissolve with the resin and other substances, forming a relatively loose molecular layer. This process helps to remove surface impurities and dirt, providing a good foundation for the subsequent formation of dendritic structures.

[0035] In a preferred embodiment of the present application, in S3, the isopropanol concentration is 60-95% rh, and the soaking time is 60-120 min.

[0036] In a preferred embodiment of the present application, in S3, the cleaning uses water flushing, and the drying parameters are the same as in S1.

[0037] It is important to note that the ratio of ethanol and isopropanol is between 1:1 and 1:3. During the isopropanol soaking stage, isopropanol molecules will further penetrate the interior of the wood-based panel and react with the cellulose and other components. Due to the differences in molecular structure and properties between isopropanol and ethanol, it can form a strong interaction with some specific components in the wood-based panel, promoting the formation of dendritic structures. The formation of dendritic structures is due to the reaction between isopropanol molecules and the components in the wood-based panel, resulting in intermolecular cross-linking and polymerization, forming a dendritic-like crystalline structure. This structure can improve the hardness and durability of the wood-based panel, and make the surface more beautiful.

[0038] First, the cellulose molecules in the wood fibers are arranged in a certain way, which affects the energy state of the molecules and the interaction between them. When the cellulose molecules are subjected to chemical or physical action, their arrangement will change, which will cause the interaction between the molecules to change.

[0039] Second, the interaction between cellulose molecules is mainly through hydrogen bonds. Hydrogen bonds are a kind of intermolecular interaction force formed by the electrostatic attraction between hydrogen atoms and atoms with strong electronegativity (such as oxygen, nitrogen). In cellulose molecules, the oxygen atoms on the hydroxyl groups can form hydrogen bonds with the hydrogen atoms in adjacent molecules, thereby connecting the molecules together.

[0040] When the cellulose molecules are subjected to the interaction of ethanol and isopropanol, the hydrogen bonds between the molecules will be rearranged. This rearrangement will cause the relative position and orientation of the molecules to change, thereby forming a new arrangement. Under certain conditions, these rearranged molecules will gradually crystallize, forming stable crystalline structures.

[0041] Finally, during the crystallization process, the cellulose molecules will arrange in a certain pattern, forming crystals with regular structures. These crystals usually present a dendritic morphology, hence the name dendrite. The formation of dendrites is the result of energy minimization.

[0042] In summary, the rearrangement and crystallization of cellulose molecules in wood fibers to form dendritic structures is achieved through the rearrangement of intermolecular interaction forces and hydrogen bonds. By controlling the action conditions and processing methods, the formation of the desired dendritic structure and morphology of cellulose molecules can be promoted.

[0043] A veneer structure of a multi-effect veneer method for a wood-based panel, comprising: a connecting layer:

[0044] The connecting layer is a dendritic structure, which is formed by the reaction of ethanol and isopropanol, and the dendritic structure randomly forms a special-shaped structure.

[0045] It should be noted that the formation of the dendritic structure means that the cellulose molecules form a more orderly and stable arrangement. This arrangement can enhance the intermolecular interaction force because the contact area between adjacent molecules increases and the number of interaction points between them increases; the dendritic structure can improve the overall uniformity and cohesion of the wood-based panel. Due to the increased intermolecular interaction force, the wood-based panel is less likely to crack when subjected to external forces. At the same time, the dendritic structure makes the bonding between fibers more compact, enhancing the overall integrity and stability of the panel; the formation of the dendritic structure can also improve the water resistance of the wood-based panel. Water has a significant impact on the cracking of wood-based panels, and the dendritic structure can reduce the force of water on cellulose molecules, reducing the shrinkage or expansion of the panel caused by changes in humidity, thereby improving its cracking resistance.

[0046] Orderliness of molecular arrangement: The cellulose molecules in the dendritic structure are arranged more orderly and regularly, which makes it easier for water to be restricted by the regular arrangement when it comes into contact with the fiber molecules, thereby reducing the free movement and interaction between water and molecules; stability of crystalline regions: The crystalline regions formed in the dendritic structure have high stability and can effectively resist external environmental factors such as water erosion. The crystalline regions can reduce the free energy between cellulose molecules, reducing the energy exchange and interaction between water and molecules; hydrogen bonding between molecules: The hydrogen bond network between cellulose molecules in the dendritic structure is more stable and dense, which can compete with water molecules. When water tries to interact with fiber molecules, the hydrogen bond network can occupy the active sites on the fiber surface, reducing the binding force between water and molecules; reduction of surface energy: The dendritic structure increases the contact area between cellulose molecules, forming a more compact arrangement. This compact arrangement can reduce the energy state of the fiber surface, making it difficult for water to form adsorption or wetting on the surface, thereby reducing the interaction between water and molecules.

[0047] In summary, the dendritic structure can reduce the effect of water on the cellulose molecules by improving the order of the arrangement of the cellulose molecules, the stability of the crystalline region, the hydrogen bonding, and the surface energy, and the like. The mechanism of reducing the effect of water helps to improve the water resistance of the wood-based panel, reduce the cracking problem caused by humidity changes, and thus improve the cracking resistance and stability.

[0048] In a preferred embodiment of the present application, a barrier layer is further provided outside the connecting layer; the barrier layer is mainly formed of acrylic copolymer.

[0049] It should be noted that the barrier layer is mainly formed of acrylic copolymer, and the specific operation is as follows:

[0050] 1. Mixing reaction: the acrylic copolymer is mixed with the wood-based panel having formed dendritic structure, and is fully stirred or mechanically mixed, the concentration of the acrylic copolymer is 10-30%, the reaction temperature is 60-100°C, and the reaction time is 50-80 min;

[0051] 2. The mixture is heated to an appropriate temperature, so that the acrylic copolymer is combined with the lignin surface of the wood-based panel and penetrates into the interior of the wood cells. The acrylic copolymer is combined with the cellulose microfibers and other components in the cell wall by heating and pressurizing, to form a three-dimensional network structure, the reaction temperature is 100-120°C, the reaction time is 50-80 min, and the ratio of cellulose to acrylic copolymer is 1:0.5 to 1:1.

[0052] 3. The heated mixture is cooled to room temperature, and then the excess acrylic copolymer remaining on the surface of the wood-based panel is removed.

[0053] The acrylic copolymer can not only be combined with the lignin surface, but also penetrate into the interior of the wood cells, be combined with the cellulose microfibers and other components in the cell wall, and form a three-dimensional network structure to wrap the original dendritic structure. After the acrylic copolymer penetrates into the interior of the wood cells, it is physically adsorbed or chemically combined with the cellulose microfibers and other components in the cell wall, so as to form a three-dimensional network structure to wrap the original dendritic microfiber structure, and a protective film is formed around the dendritic structure. When water penetrates into the wood, it first contacts the protective film. The acrylic copolymer itself has a certain water blocking ability, and the three-dimensional network it wraps also blocks the further penetration of water, so as to block the water from penetrating into the interior of the dendritic structure. Since the absorption of water in the interior of the dendritic structure is reduced, the water resistance of the dendritic structure is enhanced. Therefore, the acrylic copolymer wraps the dendritic structure by forming a protective film, blocks the penetration of water, and enhances the water resistance of the dendritic structure.

[0054] Example One

[0055] The surface of the artificial board is cleaned with a plant extract cleaner with a pH of 6 to remove surface impurities, dried, the drying parameters are temperature 65°C, humidity 10%rh, drying time 11 hours, air flow rate 1.3 m / s, and surface water stains are removed; the dried artificial board is completely immersed in an ethanol solution with a concentration of 87%rh, the temperature is 23°C, the artificial board is taken out, cleaned with a soap cleaner, dried, the drying parameters are temperature 65°C, humidity 10%rh, drying time 11 hours, air flow rate 1.3 m / s; the dried artificial board is completely immersed in an isopropanol solution with a concentration of 71%rh isopropanol for catalytic treatment, the ratio of ethanol to isopropanol is 1:1.6, the immersion time is 110 min, a dendritic structure is formed, the artificial board with the dendritic structure is cleaned with a plant extract cleaner, dried, the drying parameters are temperature 65°C, humidity 10%rh, drying time 11 hours, air flow rate 1.3 m / s; the acrylic copolymer is mixed with the artificial board that has formed a dendritic structure, the acrylic copolymer is selected as butyl acrylate, and is subjected to sufficient stirring or mechanical mixing, the butyl acrylate concentration is 21%, the reaction temperature is 68°C, and the time is 54 min; the mixture is heated to 110°C, the butyl acrylate is combined with the lignin surface of the artificial board and penetrates into the interior of the wood cells, the butyl acrylate is combined with cellulose microfibers and other components in the cell wall by heating and pressurizing, a three-dimensional network structure is formed, the reaction temperature is 110°C, the reaction time is 70 min, the ratio of cellulose to butyl acrylate is 1:1, after the reaction is completed, the artificial board is cooled to room temperature, and finally polishing is performed to remove the excess butyl acrylate, and the size is adjusted to the required size.

[0056] Experiment one:

[0057] Based on the preparation method in example one, eight rectangular artificial boards of the same size are prepared in turn, and during the preparation process, the ratio of ethanol to isopropanol is adjusted to change the amount of dendritic structure formed. The two ends of the artificial board are clamped on the fixture, the bending tester is started, and a load is gradually applied to the middle position of the artificial board at a speed of 2N / s. The load-displacement curve is monitored and recorded in real time by the displacement sensor or displacement measuring device, the displacement change during loading is obtained, and the load size applied to the sample during loading is measured in real time by the load sensor or load measuring device. When the sample breaks, the test equipment records and stores the load size at that time, which is the breaking strength. The specific experiment is shown in Table one:

[0058]

[0059]

[0060] Table one

[0061] Conclusion: From the experimental group one and several control groups, it can be seen that as the proportion of ethanol and isopropanol is continuously adjusted, until the proportion of ethanol and isopropanol is between 1:1 to 1:3, the overall amount of ethanol and isopropanol is just right, that is, ethanol and isopropanol completely react to make all the reactions on the artificial board generate dendritic structure, and the preferred ratio is 1:1.6, and the bending test is carried out on the experimental group one and several control groups respectively to detect the load capacity and check the rupture strength. It can be seen that when the proportion of ethanol and isopropanol is 1:1 to 1:3, the rupture strength of the artificial board is above 70MPa, and the preferred ratio is 1:1.6, and the rupture strength is 74.3MPa.

[0062] Experiment two:

[0063] Based on the preparation method of experiment one, the same specification and the same proportion of ethanol and isopropanol are prepared again. In the preparation process, no acrylic copolymer is used. The prepared artificial board is placed in a constant temperature water tank, and the initial weight (W1) and initial size (L1) are recorded. Then, the artificial board is placed in a water resistance detector for detection. During the detection process, ensure that the artificial board is completely immersed in water and maintain a certain pressure and time. After the detection is completed, the artificial board is taken out, the surface water is wiped dry with a towel, the final weight (W2) is obtained, and the water resistance of the artificial board is calculated according to the formula:

[0064] Water resistance = (W2-W1) / L1*100%,

[0065] Wherein, W1 is the initial weight, W2 is the final weight, L1 is the initial size, see Table two:

[0066]

[0067]

[0068] Table two

[0069] Conclusion: According to Table two, it can be seen that as the proportion of ethanol and isopropanol is continuously adjusted, until the proportion of ethanol and isopropanol is between 1:1 to 1:3, the overall amount of ethanol and isopropanol is just right, that is, ethanol and isopropanol completely react to make all the reactions on the artificial board generate dendritic structure, and the preferred ratio is 1:1.6, and when the proportion of ethanol and isopropanol is 1:1.6, the dendritic structure completely covers the artificial board, the cellulose molecules will arrange according to certain rules to form crystals with regular structure, showing a dendritic morphology, reducing the force of water on the cellulose molecules, and at the same time reducing the absorption of water by the artificial board, reducing the shrinkage or expansion of the board caused by humidity change, thereby improving its crack resistance.

[0070] Experiment three:

[0071] Based on the detection method of water resistance in experiment two and its detection formula and the preparation method of example one, the artificial board was prepared according to the ratio of ethanol and isopropanol as 1:1.6, and the amount of butyl acrylate was adjusted, that is, the ratio of cellulose to butyl acrylate was adjusted to 1:0, 1:0.5, 1:1, 1:1.5 and 1:2 respectively. After detecting the water resistance, the artificial board was placed in an environment with relative humidity of 28%, and the hot air at 30°C was directly blown for 5 hours for drying treatment to check whether the appearance was changed. The specific table three is shown below:

[0072]

[0073]

[0074] Table three

[0075] Conclusion: According to table three, it can be seen that the ratio of cellulose and butyl acrylate is continuously adjusted, that is, the content of butyl acrylate is continuously increased. According to the comparison between control group fifteen and experiment group three, it can be seen that due to the small amount of polypropylene butyl ester, the water resistance of the artificial board cannot be achieved. According to the comparison between control group seventeen, control group eighteen and experiment group three, it can be seen that too much polypropylene butyl ester is used, so that the artificial board has strong hydrophobicity. The polypropylene butyl ester forms a three-dimensional network structure on the outside of the wood fiber of the artificial board, so that the wood fiber cannot absorb the water in the gap, thereby causing the artificial board to crack in the over-drying environment. After repeated experiments, it is concluded that the ratio of cellulose to butyl acrylate is between 1:0.5 and 1:1, preferably 1:1. Within this range, the artificial board has good water resistance and will not crack in a dry environment.

[0076] According to the ideal embodiments of the present application, the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A multi-effect finishing method of a wood-based panel, characterized by, It comprises the following steps: S1: cleaning the surface of the artificial board to remove surface impurities, drying, and removing surface water stains; S2: completely immersing the dried artificial board of S1 in an ethanol solution with a concentration of 60-95%, soaking for 30-60 minutes at a temperature of 23-25℃, taking out the artificial board, cleaning again, and drying; S3: completely immersing the dried artificial board of S2 in an isopropanol solution for catalytic treatment, with an isopropanol concentration of 60-95%, soaking for 60-120 minutes, and the ratio of ethanol to isopropanol being between 1:1 and 1:3, forming a dendritic structure, cleaning and drying; The dendritic structure completely covers the artificial board, and the cellulose molecules arrange in a certain pattern to form crystals with regular structures, presenting a dendritic morphology.

2. A multi-effect finishing method of artificial board according to claim 1, characterized in that: In the S1, the cleaning is performed using a plant extract cleaner with a pH of 5-7.

3. The multi-effect finishing method of artificial board according to claim 1, characterized in that: In the S1, the drying parameters are a temperature of 50-80℃, a humidity of 10%rh, a drying time of 8-12 hours, and an air flow rate of 0.5-2m / s.

4. The multi-effect finishing method of artificial board according to claim 1, characterized in that: In the S2, the cleaning is specifically performed using a soap cleaner for scrubbing, and the drying parameters are the same as those in the S1.

5. The multi-effect finishing method of artificial board according to claim 1, characterized in that: In the S3, the cleaning is performed using clean water for rinsing, and the drying parameters are the same as those in the S1.

6. A multi-effect finishing structure of a wood-based panel, based on the multi-effect finishing method of any one of claims 1 to 5, comprising: The connecting layer is characterized in that: The connecting layer is a dendritic structure.

7. The multi-effect finishing structure of artificial board according to claim 6, characterized in that: The connecting layer is further provided with a barrier layer on the outside.

8. The multi-effect finishing structure of artificial board according to claim 7, characterized in that: The barrier layer is formed of an acrylic copolymer.

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