Anti-cracking treatment method for peach wood

Abstract

The invention discloses an anti-cracking treatment method for peach wood, and belongs to the technical field of wood anti-cracking treatment. Comprising the following steps: mixing and stirring a vegetable oil inclusion compound, a plant-derived insect repellant inclusion compound, amino acid, absolute ethyl alcohol and a surfactant compounding agent for reaction to obtain a mixed solution, and mixing and stirring the mixed solution and deionized water to obtain a composite emulsion; after peach wood is soaked in a caustic soda mixed solution, the peach wood is completely soaked in the composite emulsion, and pretreated peach wood is obtained through ultrasonic soaking; and the pretreated peach wood is washed and then soaked in a metal ion solution, and finally anti-cracking treatment is completed through drying. According to the clathration system constructed by the method disclosed by the invention, the anti-cracking treatment of peach wood is realized through the synergistic cooperation of hydrogen bond combination and metal coordination.

Description

Technical Field

[0001] The invention belongs to the technical field of wood anti-cracking treatment, and particularly relates to an anti-cracking treatment method for mahogany. Background Art

[0002] As a renewable material, wood boasts a high strength-to-weight ratio, ease of processing, attractive texture, high electrical and thermal insulation, and excellent acoustic properties. It is a commonly used material in industries such as interior design, exterior construction, and musical instrument manufacturing. Wood's green and natural qualities meet current societal demands for environmental protection and sustainable development, making it increasingly crucial in production and daily life. However, wood is susceptible to environmental factors during use, leading to deformation and cracking, which severely impacts its lifespan and aesthetics. Therefore, crack-proofing wood is crucial. Numerous free hydroxyl groups exist in the amorphous regions of wood cellulose, the side chains and branches of hemicellulose, and lignin, which readily form hydrogen bonds with water molecules. Consequently, when wood is exposed to various environments, these hydroxyl groups absorb or lose water, contributing to the wood's equilibrium with the surrounding moisture content, resulting in changes in its physical and macroscopic properties. Furthermore, the negative impact of moisture on wood properties is compounded by the combined influence of other factors, such as microorganisms, light, and heat. When wood absorbs moisture from the environment, water molecules diffuse through the cell walls upon contact with the wood and bind to cell wall components through hydrogen bonds, causing the wood fibers to swell. Conversely, when the wood loses water, it shrinks in size. The expansion and contraction of the wood cell walls can cause problems such as deformation and cracking of the wood, resulting in reduced utility of wood products, such as loose tool handles and gaps between floorboards. Furthermore, the surface or interior of the wood is susceptible to varying degrees of pests and diseases, such as termite gnawing or rat chewing, which can cause uncontrollable damage to the wood's structure and increase the risk of cracking. Therefore, preventing water absorption and pests is important for preventing wood from cracking.

[0003] The most commonly used water repellents in wood protection are plant oils such as waxes and drying oils, which can fill the cell cavity or deposit on the surface of internal pores such as cell walls and make the surface hydrophobic.

[0004] Patent CN106584619A discloses a wood anti-cracking agent. The invention uses palm oil, pine oil, catalpa oil, tung oil, beeswax, methylparaben, silicone oil, polyvinyl alcohol, glycerin, Tween, cobalt isooctanoate, neem oil and allicin as raw materials. The wood anti-cracking agent prepared by mixing can form a protective film on the surface of the wood, preventing the external environment from affecting the interior of the wood.

[0005] Patent CN106426449A discloses a method for preventing wood from cracking. The method involves first air-drying the raw wood to be prevented from cracking and cutting it into boards. The boards are then dried under reduced pressure to obtain dried boards. The dried boards are then immersed in a wood anti-cracking agent, removed, impregnated under pressure, and air-dried to obtain treated boards. Finally, the treated boards are brushed with a wood anti-cracking agent and air-dried to complete the crack prevention.

[0006] The above-mentioned treatment for wood crack prevention mainly relies on mixing different vegetable oils and waxes and then applying them to the wood surface to achieve the crack prevention function. Although this type of waterproofing agent can only slow down the water absorption behavior of wood, it cannot fundamentally reduce the total amount of water absorbed by wood. The reasons for this include: (1) waxes, vegetable oils, etc. do not form a chemical connection with wood components; (2) waxes and vegetable oils have high viscosity and can only form a protective film on the surface, but have poor penetration effect on the interior of the wood. For this reason, the existing technology has developed a new crack prevention method.

[0007] Patent CN111500179A discloses wood anti-cracking oil and its preparation method, solid wood furniture. The invention uses aromatic diisocyanate adduct, diphenylmethane diisocyanate prepolymer and polyether polyol as the main raw materials, and then mixes and formulates with auxiliary agents such as defoaming agent and antioxidant. The isocyanate structure of the active reactive group contained in the diisocyanate can react chemically with substances with active groups such as fiber, moisture, oil and fat in the wood to achieve anti-cracking treatment of the wood.

[0008] Aromatic isocyanates pose significant risks to the human body. These substances can harm the body in two ways: first, through volatilization into the air, they irritate the respiratory tract and eyes, causing asthma; and second, through contact with the skin and mucous membranes, causing damage. Their use in safety-critical wood applications, such as furniture and building materials, poses a significant risk.

[0009] The aforementioned anti-cracking treatments for wood fail to consider their universal applicability to different types of wood. Due to the diversity of existing wood species, not all existing wood types can be treated with the same anti-cracking method. Peachwood, a relatively hard wood, is widely used in home building materials, craft carving, and musical instrument making. However, due to its high sugar and gum content, ordinary oiling is unlikely to provide effective anti-cracking effects.

[0010] Therefore, designing a method that can improve the impregnation of peach wood with vegetable oil, and then improving the anti-cracking effect of peach wood, is of great significance. Summary of the Invention

[0011] In response to the deficiencies of the prior art, the present invention uses an aldehyde-encapsulated cyclodextrin with a good inclusion effect to separately encapsulate a relatively viscous vegetable oil and a botanical insect repellent with insect repellent activity. The method then introduces carboxyl groups onto the surface of the aldehyde-encapsulated cyclodextrin using the aldehyde groups, a functional group on the surface of the cycloaldehyde-encapsulated cyclodextrin, to produce a composite emulsion. Peach wood soaked in a caustic soda mixture is immersed in the composite emulsion, utilizing the ultrasonic cavitation phenomenon to increase the local pressure and enhance the composite emulsion's penetration into the peach wood. Finally, the wood is soaked in a metal ion solution and then dried to achieve crack prevention. Specifically, the technical solution of the present invention includes the following:

[0012] A method for preventing cracking of mahogany wood, comprising the following steps:

[0013] The vegetable oil inclusion compound, the plant-derived insect repellent inclusion compound, the amino acid, the anhydrous ethanol and the surfactant compound are mixed and stirred in a weight ratio of 1-3:1-3:2-4:150-350:2-5, and then reacted at 40°C-50°C for 8h-10h to obtain a mixed liquid, and the mixed liquid and deionized water are mixed and stirred in a weight ratio of 1:4-5 to obtain a composite emulsion;

[0014] The peach wood is soaked in the caustic soda mixture for 5 to 15 minutes, then completely immersed in the composite emulsion, and subjected to ultrasonic immersion treatment at a power of 100W to 200W for 20 to 30 minutes to obtain the pretreated peach wood;

[0015] The pretreated mahogany is rinsed and then immersed in a metal ion solution with a mass concentration of 1% to 1.5% for 30 minutes to 60 minutes, and finally dried to complete the anti-cracking treatment.

[0016] Furthermore, the preparation method of the vegetable oil inclusion compound comprises the following steps:

[0017] The aldehyde-modified cyclodextrin and deionized water are heated to 50° C. to 60° C., mixed and stirred to form a mixed solution, and kept warm. The kept warm mixed solution and vegetable oil are mixed and stirred at a speed of 400 r / min to 600 r / min for 2 h to 3 h, and then cooled in a low-temperature environment of 3° C. to 5° C. and allowed to stand for 18 h to 24 h to obtain a suspension A. The suspension A is filtered and dried to obtain a vegetable oil inclusion compound.

[0018] Furthermore, the vegetable oil includes palm oil, tung oil or epoxidized soybean oil.

[0019] Furthermore, the mass ratio of the aldehyded cyclodextrin: deionized water: vegetable oil is 10-15:1::90-95.

[0020] Furthermore, the preparation method of the botanical insect repellent inclusion compound comprises the following steps:

[0021] The aldehyde-modified cyclodextrin and deionized water are heated to 50° C. to 60° C., mixed and stirred to form a mixed solution, and kept warm. The kept warm mixed solution and the botanical insect repellent are mixed and stirred at a speed of 400 r / min to 600 r / min for 2 h to 3 h, and then cooled in a low-temperature environment of 3° C. to 5° C. and allowed to stand for 18 h to 24 h to obtain a suspension B. The suspension B is filtered and dried to obtain a botanical insect repellent inclusion complex.

[0022] Furthermore, the plant-derived insect repellent includes synthetic capsaicin or citronellol.

[0023] Furthermore, the mass ratio of the aldehyded cyclodextrin: deionized water: plant-based insect repellent is 10-15:1::90-95.

[0024] Furthermore, the preparation method of the aldehyded cyclodextrin comprises the following steps:

[0025] Cyclodextrin and sodium periodate are mixed in a mass ratio of 1:0.8-1.2 and stirred for reaction for 1h-2h in a light-proof environment. After the reaction, the mixture is quenched, dialyzed and dried in sequence to obtain the aldehyded cyclodextrin.

[0026] Furthermore, the cyclodextrin is β-cyclodextrin or γ-cyclodextrin.

[0027] Furthermore, the amino acid includes glycine or β-alanine.

[0028] Furthermore, the surfactant compound is composed of equal amounts of lecithin and Tween.

[0029] Furthermore, the caustic soda mixture is composed of 0.1 to 0.25 parts by weight of caustic soda, 0.05 to 0.15 parts by weight of edible alkali and 99 parts by weight of deionized water.

[0030] Furthermore, the metal ion solution includes a magnesium chloride solution or a zinc chloride solution.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention, by means of the hydrophobic cavity structure possessed by cyclodextrin, first oxidizes the adjacent dihydroxy structure of cyclodextrin to obtain the functional group aldehyde group, and then obtains the aldehyded cyclodextrin. Then, by means of the characteristics of the hydrophobic cavity structure, the vegetable oil and the botanical insect repellent with hydrophobic properties are respectively included in the hydrophobic cavity structure of the aldehyded cyclodextrin through hydrophobic interactions, and then obtain the vegetable oil inclusion compound and the botanical insect repellent inclusion compound, which reduces the defect that the vegetable oil is easily lost. The aldehyde functional group on the surface of the vegetable oil inclusion compound and the botanical insect repellent inclusion compound can be condensed with the amino acid containing amino group to form a covalently cross-linked Schiff base structure, thereby introducing the carboxyl group with strong hydrogen bonding ability into the cyclodextrin surface, so that the prepared composite emulsion can be combined with the hydroxyl group in the mahogany structure with a stronger hydrogen bonding effect through the carboxyl group, thereby competitively weakening the hydrogen bonding effect between the water molecules in the environment and the mahogany, reducing the effect of the mahogany absorbing water from the environment, and improving the defect that the vegetable oil is difficult to further penetrate into the interior of the mahogany due to its high viscosity. Because the surface of peach wood treated with the caustic soda mixture contains inorganic bases such as sodium hydroxide and sodium carbonate, when fully immersed in the composite emulsion, ultrasonic cavitation facilitates the emulsion's penetration. Furthermore, the carboxyl groups exist as anionic carboxylates, which are negatively charged structures formed by deprotonation of carboxylic acids. When subsequently immersed in a metal ion solution, the carboxylates, unlike the centrally charged carboxyl groups, not only coordinate with the metal ions in the solution but also form electrostatic adsorption bonds with the metal ions, further enhancing the stability of the coordinated crosslinking. The metal ions also coordinate with the hydroxyl groups in the peach wood, further competing to weaken the hydrogen bonding between the hydroxyl groups and ambient water molecules. The botanical insect repellent, through its intense irritation, reduces the risk of insects and animals biting the wood, which could weaken the wood's structure and increase the likelihood of cracking. Through the synergistic effects of competitive hydrogen bonding, metal coordination, the water-repellent properties of the plant oil, and the botanical insect repellent, the crack-resistant treatment of the peach wood is achieved. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions of the present invention through the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0035] Preparation Example 1:

[0036] The preparation of aldehyde-cyclodextrin specifically includes the following steps:

[0037] Weigh 100g of β-cyclodextrin into a container, then add 2kg of deionized water, heat to 40°C, and stir until the β-cyclodextrin is completely dissolved. Then cool to room temperature. Then, add 80g of sodium periodate, and stir in a dark environment for 1 hour. After the reaction, add sodium bisulfite to quench the sodium periodate. The solution containing the aldehyded cyclodextrin is then collected by dialysis and dried to obtain the aldehyded cyclodextrin.

[0038] Preparation Example 2:

[0039] The preparation of aldehyde-cyclodextrin specifically includes the following steps:

[0040] Weigh 100g of β-cyclodextrin into a container, then add 2kg of deionized water, heat to 40°C, and stir until the β-cyclodextrin is completely dissolved. Then cool to room temperature. Then, add 100g of sodium periodate, and stir in a dark environment for 1.5 hours. After the reaction is complete, add sodium bisulfite to quench the sodium periodate. The solution containing the aldehyded cyclodextrin is then collected by dialysis and dried to obtain the aldehyded cyclodextrin.

[0041] Preparation Example 3:

[0042] The preparation of aldehyde-cyclodextrin specifically includes the following steps:

[0043] Weigh 100g of γ-cyclodextrin into a container, then add 3kg of deionized water, heat to 40°C, and stir until the γ-cyclodextrin is completely dissolved. Then cool to room temperature. Then, add 80g-120g of sodium periodate, and stir in a dark environment for 1-2 hours. After the reaction, add sodium bisulfite to quench the sodium periodate. The solution containing the aldehyded cyclodextrin is then collected by dialysis and dried to obtain the aldehyded cyclodextrin.

[0044] Preparation Example 4:

[0045] The preparation of aldehyde-cyclodextrin specifically includes the following steps:

[0046] Weigh 100g of γ-cyclodextrin into a container, then add 3kg of deionized water, heat to 40°C, and stir until the γ-cyclodextrin is completely dissolved. Then cool to room temperature. Then, add 200g of sodium periodate, and stir in a dark environment for 5 hours. After the reaction, add sodium bisulfite to quench the sodium periodate. The solution containing the aldehyded cyclodextrin is then collected by dialysis and dried to obtain the aldehyded cyclodextrin.

[0047] Preparation Example 5:

[0048] The preparation of aldehyde-cyclodextrin specifically includes the following steps:

[0049] Weigh 100g of α-cyclodextrin into a container, then add 3kg of deionized water, heat to 40°C, and stir until the α-cyclodextrin is completely dissolved. Then cool to room temperature. Then, add 120g of sodium periodate, and stir in a dark environment for 2 hours. After the reaction, add sodium bisulfite to quench the sodium periodate. The solution containing the aldehyded cyclodextrin is then collected by dialysis and dried to obtain the aldehyded cyclodextrin.

[0050] Preparation Example 6:

[0051] The preparation of vegetable oil inclusion compound specifically includes the following processes:

[0052] Take 20g of the aldehyde-modified cyclodextrin obtained in Preparation Example 1, add it to 180g of deionized water and heat it to 50°C, then stir it until it is completely dissolved to obtain a mixed solution, and control the temperature of the mixed solution to be kept warm at 50°C. Subsequently, at this insulation temperature, 2g of palm oil is added dropwise to the mixed solution, and then mixed and stirred at a speed of 400r / min for 2h. After the mixing and stirring is completed, it is naturally cooled to room temperature, and then placed in a temperature environment of 3°C to 5°C and cooled and allowed to stand for 18h. The suspension A obtained after cooling and standing is filtered with a suction filter and the precipitate is collected. After the precipitate is carefully rinsed with ethanol, it is placed in a vacuum drying oven at 55°C and dried to obtain a vegetable oil inclusion compound.

[0053] Preparation Example 7:

[0054] The preparation of vegetable oil inclusion compound specifically includes the following processes:

[0055] Take 25g of the aldehyde-modified cyclodextrin obtained in Preparation Example 2, add it to 185g of deionized water and heat it to 55°C, then stir it until it is completely dissolved to obtain a mixed solution, and control the temperature of the mixed solution to be kept warm at 55°C. Subsequently, at this insulation temperature, 2g of tung oil is added dropwise to the mixed solution, and then mixed and stirred at a speed of 500r / min for 2.5h. After the mixing and stirring is completed, it is naturally cooled to room temperature, and then placed in a temperature environment of 3°C to 5°C and cooled and allowed to stand for 20h. The suspension A obtained after cooling and standing is filtered with a suction filter and the precipitate is collected. After the precipitate is carefully rinsed with ethanol, it is placed in a vacuum drying oven at 55°C and dried to obtain a vegetable oil inclusion compound.

[0056] Preparation Example 8:

[0057] The preparation of vegetable oil inclusion compound specifically includes the following processes:

[0058] Take 30g of the aldehyde-modified cyclodextrin obtained in Preparation Example 3, add it to 190g of deionized water, heat it to 60°C, and then stir it until it is completely dissolved to obtain a mixed solution. The temperature of the mixed solution is controlled to be kept warm at 60°C. Subsequently, 2g of epoxidized soybean oil is added dropwise to the mixed solution at this insulation temperature, and then mixed and stirred at a speed of 600r / min for 3h. After the mixing and stirring is completed, it is naturally cooled to room temperature, and then placed in a temperature environment of 3°C to 5°C and cooled and allowed to stand for 24h. The suspension A obtained after cooling and standing is filtered with a suction filter and the precipitate is collected. After the precipitate is carefully rinsed with ethanol, it is placed in a vacuum drying oven at 55°C and dried to obtain a vegetable oil inclusion compound.

[0059] Preparation Example 9:

[0060] The preparation of vegetable oil inclusion compound specifically includes the following processes:

[0061] The aldehyde-cyclodextrin in Preparation Example 8 was replaced by the aldehyde-cyclodextrin obtained in Preparation Example 4, and the other conditions remained the same as in Preparation Example 8.

[0062] Preparation Example 10

[0063] The preparation of vegetable oil inclusion compound specifically includes the following processes:

[0064] The aldehyde-cyclodextrin in Preparation Example 8 was replaced by the aldehyde-cyclodextrin obtained in Preparation Example 5, and the other conditions remained the same as those in Preparation Example 8.

[0065] Preparation Example 11:

[0066] The preparation of the botanical insect repellent inclusion compound specifically includes the following steps:

[0067] Take 20g of the aldehyde-modified cyclodextrin obtained in Preparation Example 1, add it to 180g of deionized water and heat it to 50°C, then stir it until it is completely dissolved to obtain a mixed solution, and control the temperature of the mixed solution to be kept warm at 50°C. Subsequently, at this insulation temperature, 2g of synthetic capsaicin is added to the mixed solution, and then mixed and stirred at a speed of 400r / min for 2h. After the mixing and stirring is completed, it is naturally cooled to room temperature, and then placed in a temperature environment of 3°C to 5°C and cooled and allowed to stand for 18h. The suspension B obtained after cooling and standing is filtered with a suction filter and the precipitate is collected. After the precipitate is carefully rinsed with ethanol, it is placed in a vacuum drying oven at 55°C and dried to obtain a plant-derived insect repellent inclusion compound.

[0068] Preparation Example 12:

[0069] The preparation of the botanical insect repellent inclusion compound specifically includes the following steps:

[0070] Take 25g of the aldehyde-modified cyclodextrin obtained in Preparation Example 2, add it to 185g of deionized water and heat it to 55°C, then stir it until it is completely dissolved to obtain a mixed solution, and control the temperature of the mixed solution to be kept warm at 55°C. Subsequently, at this insulation temperature, 2g of synthetic capsaicin is added to the mixed solution, and then mixed and stirred at a speed of 500r / min for 2.5h. After the mixing and stirring is completed, it is naturally cooled to room temperature, and then placed in a temperature environment of 3°C to 5°C and cooled and allowed to stand for 20h. The suspension B obtained after cooling and standing is filtered with a suction filter and the precipitate is collected. After the precipitate is carefully rinsed with ethanol, it is placed in a vacuum drying oven at 55°C and dried to obtain a plant-derived insect repellent inclusion compound.

[0071] Preparation Example 13:

[0072] The preparation of the botanical insect repellent inclusion compound specifically includes the following steps:

[0073] Take 30g of the aldehyde-modified cyclodextrin obtained in Preparation Example 3, add it to 190g of deionized water, heat it to 60°C, and then stir it until it is completely dissolved to obtain a mixed solution. The temperature of the mixed solution is kept at 60°C. Subsequently, 2g of citronellol is added to the mixed solution at this insulation temperature, and then mixed and stirred at a speed of 600r / min for 3h. After the mixing and stirring is completed, it is naturally cooled to room temperature, and then placed in a temperature environment of 3°C to 5°C and cooled and allowed to stand for 24h. The suspension A obtained after cooling and standing is filtered with a suction filter and the precipitate is collected. After the precipitate is carefully rinsed with ethanol, it is placed in a vacuum drying oven at 55°C and dried to obtain a plant-derived insect repellent inclusion compound.

[0074] Preparation Example 14:

[0075] The preparation of the botanical insect repellent inclusion compound specifically includes the following steps:

[0076] The aldehyde-cyclodextrin in Preparation Example 13 was replaced by the aldehyde-cyclodextrin obtained in Preparation Example 4, and the other conditions remained the same as those in Preparation Example 13.

[0077] Preparation Example 15:

[0078] The preparation of the botanical insect repellent inclusion compound specifically includes the following steps:

[0079] The aldehyde-cyclodextrin in Preparation Example 13 was replaced by the aldehyde-cyclodextrin obtained in Preparation Example 5, and the other conditions remained the same as those in Preparation Example 13.

[0080] Preparation Example 16:

[0081] The preparation of the botanical insect repellent inclusion compound specifically includes the following steps:

[0082] The citronellol in Preparation Example 13 was replaced by allicin, and the other conditions remained the same as those in Preparation Example 13.

[0083] Example 1:

[0084] A method for preventing cracking of mahogany specifically comprises the following steps:

[0085] Weigh 1 part by weight of the vegetable oil inclusion compound obtained in Preparation Example 6, 1 part by weight of the botanical insect repellent inclusion compound obtained in Preparation Example 11, 2 parts by weight of glycine, 150 parts by weight of anhydrous ethanol, 1 part by weight of lecithin, and 1 part by weight of Tween, and mix them. Then, stir at 200 r / min for 2 hours. After stirring, place the mixture in a 40°C water bath and react for 8 hours to obtain a mixed solution. Then, add deionized water to the mixture in a ratio of 1:4 by weight, and stir thoroughly to obtain a composite emulsion.

[0086] Weigh 0.1 weight portion of caustic soda, 0.05 weight portion of edible alkali and 99 weight portion of deionized water and mix and stir to dissolve completely to form caustic soda mixture. Saw peach wood into timber size that length is 100mm, width is 30mm and thickness is 15mm, polish the peach wood surface with sandpaper, then fully immerse peach wood in caustic soda mixture, can take tumbling or other reasonable methods in the soaking process, guarantee that peach wood is fully soaked, and caustic soda mixture soaking time maintains 5min. Take out and drain surface caustic soda mixture after soaking, then fully immerse in composite emulsion, soak 20min under the ultrasonic power of 100W. After ultrasonic impregnation finishes, the pre-treated peach wood that obtains is rinsed with deionized water, until the rinse water is neutral, then pre-treated peach wood is put into mass concentration and is that 1% magnesium chloride solution soaks 30min and obtains impregnation peach wood. Take out impregnation peach wood after soaking and drain surface solution, then be placed in 50 ℃ dry environment and process to water content and reach 8%, complete anti-cracking treatment.

[0087] Example 2:

[0088] A method for preventing cracking of mahogany specifically comprises the following steps:

[0089] Weigh 1 part by weight of the vegetable oil inclusion compound obtained in Preparation Example 6, 1 part by weight of the botanical insect repellent inclusion compound obtained in Preparation Example 11, 2 parts by weight of glycine, 200 parts by weight of anhydrous ethanol, 1 part by weight of lecithin, and 1 part by weight of Tween, and mix them. Then, stir at 200 r / min for 2 hours. After stirring, place the mixture in a 40°C water bath and react for 8 hours to obtain a mixed solution. Then, add deionized water to the mixture in a ratio of 1:4 by weight, and stir thoroughly to obtain a composite emulsion.

[0090] Weigh 0.15 weight portion of caustic soda, 0.05 weight portion of edible alkali and 99 weight portion of deionized water and mix and stir to dissolve completely to form caustic soda mixture. Saw peach wood into timber size of 100mm in length, 30mm in width and 15mm in thickness, polish the peach wood surface with sandpaper, then fully immerse the peach wood in the caustic soda mixture. In the soaking process, roll or other reasonable methods can be taken to ensure that the peach wood is fully soaked, and the caustic soda mixture soaking time is maintained at 5min. Take out and drain the surface caustic soda mixture after soaking, then fully immerse in the composite emulsion, and soak for 22min under an ultrasonic power of 120W. After the pre-treated peach wood obtained after ultrasonic immersion finishes, rinse with deionized water until the rinse water is neutral, then put the pre-treated peach wood into a magnesium chloride solution of 1.1% by mass concentration and soak for 40min to obtain the impregnated peach wood. Take out the impregnated peach wood after soaking and drain the surface solution, then place it in a dry environment of 50 ℃ and process to a water content of 8%, complete the anti-cracking process.

[0091] Example 3:

[0092] A method for preventing cracking of mahogany specifically comprises the following steps:

[0093] Weigh 2 parts by weight of the vegetable oil inclusion compound obtained in Preparation Example 7, 2 parts by weight of the botanical insect repellent inclusion compound obtained in Preparation Example 12, 3 parts by weight of glycine, 200 parts by weight of anhydrous ethanol, 1.5 parts by weight of lecithin, and 1.5 parts by weight of Tween, and mix them. Then, stir at 250 r / min for 2.5 hours. After stirring, place the mixture in a 45°C water bath and react for 9 hours to obtain a mixed solution. Then, add deionized water to the mixture in a ratio of 1:4 by weight, and stir until uniformly mixed to obtain a composite emulsion.

[0094] Weigh 0.15 weight portion of caustic soda, 0.1 weight portion of edible alkali and 99 weight portion of deionized water and mix and stir until completely dissolved to form caustic soda mixture. Saw peach wood into timber size of 100mm in length, 40mm in width and 20mm in thickness, polish the surface of peach wood with sandpaper, then fully immerse peach wood in caustic soda mixture. During the immersion process, roll or other reasonable methods can be taken to ensure that peach wood is fully immersed. The caustic soda mixture soaking time is maintained at 10min. After immersion, take out and drain the surface caustic soda mixture, then fully immerse in the composite emulsion, and soak for 24min under an ultrasonic power of 140W. After the pre-treated peach wood obtained after ultrasonic immersion finishes, rinse with deionized water until the rinse water is neutral. Then, put the pre-treated peach wood into a magnesium chloride solution of 1.2% by mass concentration and soak for 40min to obtain the impregnated peach wood. Take out the impregnated peach wood after immersion and drain the surface solution, then place it in a dry environment of 55°C and process to a water content of 9%, complete the anti-cracking process.

[0095] Example 4:

[0096] A method for preventing cracking of mahogany specifically comprises the following steps:

[0097] Weigh 2 parts by weight of the vegetable oil inclusion compound obtained in Preparation Example 7, 2 parts by weight of the botanical insect repellent inclusion compound obtained in Preparation Example 12, 3 parts by weight of β-alanine, 250 parts by weight of anhydrous ethanol, 2 parts by weight of lecithin, and 2 parts by weight of Tween, and mix them. Then, stir at 250 r / min for 2.5 hours. After stirring, place the mixture in a 45°C water bath and react for 9 hours to obtain a mixed solution. Then, add deionized water to the mixture in a ratio of 1:5 by weight, and stir until uniformly mixed to obtain a composite emulsion.

[0098] Weigh 0.2 weight portion of caustic soda, 0.1 weight portion of edible alkali and 99 weight portion of deionized water and mix and stir to dissolve completely to form caustic soda mixture. Saw peach wood into timber size of 100mm in length, 40mm in width and 20mm in thickness, polish the peach wood surface with sandpaper, then fully immerse the peach wood in the caustic soda mixture. In the soaking process, roll or other reasonable methods can be taken to ensure that the peach wood is fully soaked. The caustic soda mixture soaking time is maintained at 10min. After soaking, take out and drain the surface caustic soda mixture, then fully immerse in the composite emulsion, and soak for 26min under an ultrasonic power of 160W. After the pre-treated peach wood obtained after ultrasonic immersion finishes, rinse with deionized water until the rinse water is neutral. Then, the pre-treated peach wood is put into a zinc chloride solution of 1.3% by mass concentration and soaked for 50min to obtain the impregnated peach wood. Take out the impregnated peach wood after soaking and drain the surface solution, then place it in a dry environment of 55 ℃ and process to a water content of 9%, complete the anti-cracking process.

[0099] Example 5:

[0100] A method for preventing cracking of mahogany specifically comprises the following steps:

[0101] Weigh 3 parts by weight of the vegetable oil inclusion compound obtained in Preparation Example 8, 3 parts by weight of the botanical insect repellent inclusion compound obtained in Preparation Example 13, 4 parts by weight of β-alanine, 300 parts by weight of anhydrous ethanol, 2 parts by weight of lecithin, and 2 parts by weight of Tween, and mix them. Then, stir at 300 r / min for 3 hours. After stirring, place the mixture in a 50°C water bath and react for 10 hours to obtain a mixed solution. Then, add deionized water to the mixture in a ratio of 1:5 by weight of the mixed solution to deionized water, and stir until uniformly mixed to obtain a composite emulsion.

[0102] Weigh 0.2 weight portion of caustic soda, 0.15 weight portion of edible alkali and 99 weight portion of deionized water and mix and stir to dissolve completely to form caustic soda mixture. Peach wood is sawn into a timber size of 100mm in length, 50mm in width and 30mm in thickness, polish the surface of the peach wood with sandpaper, then the peach wood is fully immersed in the caustic soda mixture, and tumbling or other reasonable methods can be taken in the soaking process to ensure that the peach wood is fully immersed, and the caustic soda mixture soaking time is maintained at 15min. After soaking, take out and drain the surface caustic soda mixture, then be fully immersed in the composite emulsion, and soak for 28min under an ultrasonic power of 180W. After the pre-treated peach wood obtained after ultrasonic impregnation finishes, rinse with deionized water, until the rinse water is neutral, then the pre-treated peach wood is put into a zinc chloride solution of 1.4% mass concentration and soak for 50min to obtain the impregnated peach wood. Take out the impregnated peach wood after the soaking and drain the surface solution, then be placed in a dry environment of 60 ℃ and process to a water content of 10%, complete the anti-cracking process.

[0103] Example 6:

[0104] A method for preventing cracking of mahogany specifically comprises the following steps:

[0105] Weigh 3 parts by weight of the vegetable oil inclusion compound obtained in Preparation Example 8, 3 parts by weight of the botanical insect repellent inclusion compound obtained in Preparation Example 13, 4 parts by weight of β-alanine, 350 parts by weight of anhydrous ethanol, 2.5 parts by weight of lecithin, and 2.5 parts by weight of Tween, mix, and then stir at 300 r / min for 3 hours. After stirring, place in a 50°C water bath and react for 10 hours to obtain a mixed solution. Then, add deionized water to the mixed solution in a ratio of 1:5 by weight of the mixed solution to deionized water, and stir until uniformly mixed to obtain a composite emulsion.

[0106] Weigh 0.25 weight portion of caustic soda, 0.15 weight portion of edible alkali and 99 weight portion of deionized water and mix and stir to dissolve completely to form caustic soda mixture. Saw the mahogany wood into a timber size of 100mm in length, 50mm in width and 30mm in thickness, polish the mahogany wood surface with sandpaper, then immerse the mahogany wood fully in the caustic soda mixture, and in the soaking process, roll or other reasonable methods can be taken to ensure that the mahogany wood is fully soaked, and the caustic soda mixture soaking time is maintained at 15min. Take out and drain the surface caustic soda mixture after soaking, then fully immerse in the composite emulsion, and soak for 30min under an ultrasonic power of 200W. After the pre-treatment mahogany wood obtained after ultrasonic immersion finishes, rinse with deionized water, until the rinse water is neutral, then put the pre-treatment mahogany wood into a mass concentration of 1.5% zinc chloride solution and soak for 60min to obtain the impregnated mahogany wood. Take out the impregnated mahogany wood after soaking and drain the surface solution, then place it in a dry environment of 60 ℃ and process it to a water content of 10%, complete the anti-cracking process.

[0107] Comparative Example 1:

[0108] A method for preventing cracking of mahogany specifically comprises the following steps:

[0109] The vegetable oil inclusion compound and the botanical insect repellent inclusion compound in Example 6 were replaced by the vegetable oil inclusion compound obtained in Preparation Example 9 and the botanical insect repellent inclusion compound obtained in Preparation Example 14, respectively. The other conditions remained the same as in Example 6.

[0110] Comparative Example 2:

[0111] A method for preventing cracking of mahogany specifically comprises the following steps:

[0112] The vegetable oil inclusion compound and the botanical insect repellent inclusion compound in Example 6 were replaced by the vegetable oil inclusion compound obtained in Preparation Example 10 and the botanical insect repellent inclusion compound obtained in Preparation Example 15, respectively, and the other conditions remained the same as in Example 6.

[0113] Comparative Example 3:

[0114] A method for preventing cracking of mahogany specifically comprises the following steps:

[0115] The zinc chloride solution in Example 6 was replaced by ferric chloride solution, and the other conditions remained the same as in Example 6.

[0116] Comparative Example 4:

[0117] A method for preventing cracking of mahogany specifically comprises the following steps:

[0118] The botanical insect repellent inclusion compound in Example 6 was replaced by the botanical insect repellent inclusion compound obtained in Preparation Example 16, and the other conditions remained the same as in Example 6.

[0119] Comparative Example 5:

[0120] A method for preventing cracking of mahogany specifically comprises the following steps:

[0121] The caustic soda mixture soaking process in Example 6 was removed, and the samples were directly immersed in the composite emulsion. The other conditions remained the same as in Example 6.

[0122] Comparative Example 6:

[0123] A method for preventing cracking of mahogany specifically comprises the following steps:

[0124] The amount of caustic soda in the caustic soda mixture in Example 6 was increased to 2 parts by weight, the immersion time was extended to 30 min, and the other conditions were kept consistent with Example 6. It was found that the peach wood treated with the caustic soda mixture turned black and cracked significantly. This may be because the amount of caustic soda in the caustic soda mixture was too high and the long-term immersion caused a relatively strong degradation of lignin and cellulose in the peach wood, which in turn caused damage to the peach wood structure, which was not conducive to the anti-cracking treatment.

[0125] Comparative Example 7:

[0126] A method for preventing cracking of mahogany specifically comprises the following steps:

[0127] The ultrasonic power in Example 6 was increased to 300W, the ultrasonic immersion time was extended to 50min, and the other conditions were consistent with Example 6. It was found that larger cracks appeared on the surface of the pretreated peach wood after ultrasonic immersion. This may be due to the high power and long-term ultrasonic cavitation, which strengthened the local pressure and caused cracks in the peach wood structure, which is not conducive to the use of ultrasound to achieve the promoting penetration of the composite emulsion on the peach wood.

[0128] Comparative Example 8:

[0129] A method for preventing cracking of mahogany specifically comprises the following steps:

[0130] The ultrasonic immersion process in Example 6 was removed, and the other conditions remained the same as in Example 6.

[0131] In accordance with GB / T 29905-2013 Test method for loss rate of wood preservatives, an anti-loss test was conducted on the peach wood after anti-cracking treatment in Examples 1 to 6, Comparative Examples 1 to 5 and Comparative Example 8, with the peach wood that had not undergone any treatment as a blank control (peach wood size: length 100 mm, width 50 mm and thickness 30 mm). The peach wood was completely submerged in water for 10 days, and then the ratio of the weight difference before and after immersion to the weight of the peach wood before immersion was used as the weight gain rate of the peach wood. The results are shown in Table 1 below.

[0132] Table 1 Water-immersion weight gain rate of mahogany

[0133]

[0134]

[0135] The peach wood after crack prevention treatment of Examples 1 to 6, Comparative Examples 1 to 5 and Comparative Example 8 was placed in an environment with a humidity of 65% ± 5% and a temperature of 40°C ± 5°C, and the peach wood without any treatment was used as a blank control (peach wood size: length 100mm, width 50mm and thickness 30mm). The wood was then treated for 1 month, and the surface cracks of the peach wood were recorded after 1 month. The results are shown in Table 2 below.

[0136] Table 2 Peach wood cracking test results

[0137]

[0138]

[0139] The peach wood samples from Examples 1 to 6, Comparative Examples 1 to 5, and Comparative Example 8 that had undergone anti-cracking treatment were placed in a glass box, with untreated peach wood serving as a blank control (peach wood dimensions: length 100 mm, width 50 mm, and thickness 30 mm). The glass box was kept at room temperature, and insects and ants were then evenly scattered on the surface of the peach wood from a field stump. After 24 hours of incubation, the surface damage of the peach wood was observed, and the maximum diameter of the damaged area was recorded. The results are shown in Table 3 below.

[0140] Table 3 Peach wood insect pest test results

[0141]

[0142]

[0143] From the test results in Table 1 and Table 3 above, it can be concluded that:

[0144] (1) The results of Examples 1 to 6 show that the aldehyde-formylated cyclodextrin of the present invention has a good inclusion effect, and can respectively include vegetable oil with high viscosity and botanical insect repellent with insect repellent activity. Then, by means of the aldehyde group, a functional group on the surface of the aldehyde-formylated cyclodextrin, a carboxyl group is introduced into the surface of the aldehyde-formylated cyclodextrin to obtain a composite emulsion. The peach wood soaked in the caustic soda mixture is immersed in the composite emulsion, and the cavitation phenomenon of ultrasound can increase the effect of local pressure, thereby increasing the penetration of the composite emulsion into the peach wood. Finally, the peach wood is soaked in a metal ion solution and dried, which has a good performance effect on crack prevention and insect pest prevention.

[0145] (2) Comparative Example 1 shows that excessive use of sodium periodate and prolonged oxidation time may damage the cavity structure of γ-cyclodextrin, leading to poor encapsulation of vegetable oil and plant-based insect repellent, resulting in strong water absorption and poor anti-cracking and anti-insect effects.

[0146] (3) Comparative Example 2 shows that α-cyclodextrin has a smaller hydrophobic cavity structure than β-cyclodextrin and γ-cyclodextrin, and the molecular weight of vegetable oil is higher, which may lead to poor inclusion of α-cyclodextrin on vegetable oil, strong water absorption, and poor anti-cracking effect.

[0147] (4) Comparative Example 3 shows that although the iron ions in ferric chloride have metal coordination ability, the acidity of the ferric chloride solution is relatively strong, which may have a strong decomposition effect on the imine bond constructed by the aldehyde group and the amino group of the amino acid on the vegetable oil inclusion compound and the botanical insect repellent inclusion compound of the present invention, resulting in difficulty in introducing a carboxyl structure on the surface of the aldehyde-modified cyclodextrin. As a result, after being treated with the caustic soda mixture, the negative charge effect of the carboxylate is relatively poor, resulting in poor cross-linking stability, making the peach wood absorb water more strongly and having poor anti-cracking and anti-insect effects.

[0148] (5) Comparative Example 4 shows that allicin also has a good insect repellent effect, but due to its irritating smell, it may affect the user experience and is not suitable for use in furniture and building materials that come into direct contact with people.

[0149] (6) Comparative Example 5 shows that the caustic soda mixture can not only effectively remove the sugar and gum on the mahogany wood that attract pests, but also the weak alkaline environment on the surface of the mahogany wood after draining makes it possible to soak it in the composite emulsion and then in the metal ion solution, which is conducive to the cross-linking effect of electrostatic adsorption, further enhancing the stability after metal coordination. Without soaking in the caustic soda mixture, it only relies on the hydrogen bonding between chemical groups such as carboxyl and hydroxyl groups, has strong water absorption, and poor anti-cracking and anti-insect effects.

[0150] (7) Comparative Example 8 shows that although the viscosity of the vegetable oil is reduced after being coated with aldehyde-modified cyclodextrin, without the additional penetration-promoting effect of ultrasonic cavitation, the vegetable oil inclusion compound, after carboxylation, relies on the hydrogen bonding effect between the carboxyl group and the hydroxyl group in the mahogany structure, which may result in slower penetration, stronger water absorption, and poor anti-cracking and anti-insect effects.

[0151] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A method for preventing cracking of mahogany, characterized in that: The anti-cracking treatment method comprises the following steps: The vegetable oil inclusion compound, the plant-derived insect repellent inclusion compound, the amino acid, the anhydrous ethanol and the surfactant compound are mixed and stirred in a weight ratio of 1-3:1-3:2-4:150-350:2-5, and then reacted at 40°C-50°C for 8h-10h to obtain a mixed liquid, and the mixed liquid and deionized water are mixed and stirred in a weight ratio of 1:4-5 to obtain a composite emulsion; The peach wood is soaked in the caustic soda mixture for 5 to 15 minutes, then completely immersed in the composite emulsion, and subjected to ultrasonic immersion treatment at a power of 100W to 200W for 20 to 30 minutes to obtain the pretreated peach wood; The pretreated mahogany is rinsed and then immersed in a metal ion solution with a mass concentration of 1% to 1.5% for 30 minutes to 60 minutes, and finally dried to complete the anti-cracking treatment.

2. The method for preventing cracking of mahogany according to claim 1, wherein: The preparation method of the vegetable oil inclusion compound comprises the following steps: The aldehyde-modified cyclodextrin and deionized water are heated to 50° C. to 60° C., mixed and stirred to form a mixed solution, and kept warm. The kept warm mixed solution and vegetable oil are mixed and stirred at a speed of 400 r / min to 600 r / min for 2 h to 3 h, and then cooled in a low-temperature environment of 3° C. to 5° C. and allowed to stand for 18 h to 24 h to obtain a suspension A. The suspension A is filtered and dried to obtain a vegetable oil inclusion compound.

3. The anti-cracking treatment method for mahogany according to claim 2, characterized in that: The vegetable oil includes palm oil, tung oil or epoxidized soybean oil.

4. The method for preventing cracking of mahogany according to claim 2, wherein: The mass ratio of the aldehyded cyclodextrin: deionized water: vegetable oil is 10-15:1::90-95.

5. The method for preventing cracking of mahogany according to claim 1, wherein: The preparation method of the botanical insect repellent inclusion compound comprises the following steps: The aldehyde-modified cyclodextrin and deionized water are heated to 50° C. to 60° C., mixed and stirred to form a mixed solution, and kept warm. The kept warm mixed solution and the botanical insect repellent are mixed and stirred at a speed of 400 r / min to 600 r / min for 2 h to 3 h, and then cooled in a low-temperature environment of 3° C. to 5° C. and allowed to stand for 18 h to 24 h to obtain a suspension B. The suspension B is filtered and dried to obtain a botanical insect repellent inclusion complex.

6. A method for preventing peach wood from cracking according to claim 5, characterized in that: The botanical insect repellents include synthetic capsaicin or citronellol.

7. The method for preventing peach wood from cracking according to claim 5, wherein: The mass ratio of the aldehyded cyclodextrin: deionized water: plant-based insect repellent is 10-15:1::90-95.

8. The method for preventing cracking of mahogany according to claim 1, wherein: The amino acids include glycine or β-alanine.

9. The method for preventing cracking of mahogany according to claim 1, wherein: The surfactant compound is composed of equal amounts of lecithin and Tween.

10. The method for preventing peach wood from cracking according to claim 1, wherein: The metal ion solution includes a magnesium chloride solution or a zinc chloride solution.

Images