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CN114701029B - Pretreatment process of rosewood - Google Patents

Pretreatment process of rosewood Download PDF

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Publication number
CN114701029B
CN114701029B CN202210403057.0A CN202210403057A CN114701029B CN 114701029 B CN114701029 B CN 114701029B CN 202210403057 A CN202210403057 A CN 202210403057A CN 114701029 B CN114701029 B CN 114701029B
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Prior art keywords
rosewood
pretreatment
aqueous solution
soaking
drying
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CN114701029A (en
Inventor
伍泳莉
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Zhongshan Wu's Grand View Garden Furniture Co ltd
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Zhongshan Wu's Grand View Garden Furniture Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/025—Controlling the process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/20—Compounds of alkali metals or ammonium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/22—Compounds of zinc or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/32—Mixtures of different inorganic impregnating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/34—Organic impregnating agents
    • B27K3/36—Aliphatic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/34—Organic impregnating agents
    • B27K3/50—Mixtures of different organic impregnating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/04—Combined bleaching or impregnating and drying of wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2240/00—Purpose of the treatment
    • B27K2240/20—Removing fungi, molds or insects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

The invention discloses a rosewood pretreatment process, which specifically comprises the following steps: s1, soaking rosewood in a first pretreatment aqueous solution at the temperature of 5-20 ℃; the solutes of the first aqueous pretreatment solution include sodium chloride and cuprammonium complexes; s2, soaking the rosewood obtained in the step S1 in a second pretreatment aqueous solution at the temperature of between 10 ℃ below zero and 0 ℃. The solute of the second pretreatment aqueous solution comprises sodium chloride, oxalic acid and quercetin; s3, drying the rosewood obtained in the step S2. The pretreatment process of the rosewood can effectively inhibit deformation of the rosewood in the preparation and use processes, inhibit mildew and worm-eating of the rosewood in the use processes, improve the drying speed and degree of the rosewood, and remove uncomfortable smell of the rosewood.

Description

Pretreatment process of rosewood
Technical Field
The invention belongs to the technical field of rosewood processing, and particularly relates to a rosewood pretreatment process.
Background
Along with the continuous improvement of living standard, the quality requirements of people on furniture are higher and higher, and the solid wood classical furniture which is environment-friendly and texture is considered more. The solid wood classical furniture is furniture made of rosewood such as rosewood and the like, is a generic name for rare and high-quality hard wood furniture, and is widely popular as a high-grade consumer product in the prior life.
The rosewood used for preparing the solid wood classical furniture can be divided into two families, five genera, eight classes and twenty-nine classes, and the common rosewood, the sandalwood, the rosewood, the acid wood, the chicken wing wood and the like are mainly used, wherein the acid wood comprises red acid branches, black acid branches, laos scarlet acid branches and the like; the rosewood also comprises Burmese roses and the like.
Rosewood grows slowly, is hard in material and has a growing period of more than hundreds of years; that is, rosewood is scarce in source and expensive. Therefore, in the processing process of rosewood, on one hand, adverse phenomena such as warping and the like are avoided, and further, the loss of raw materials is avoided; on the other hand, the phenomena of worm damage, mildew and the like are inhibited as much as possible so as to prolong the service life of the rosewood product.
In the traditional process, the method for avoiding warping mainly comprises a mechanical auxiliary method and a filling method; the mechanical auxiliary method is to press the wood by external force in the processing process to avoid deformation, the method can treat the symptoms and the root causes, and the wood still can deform if the temperature and the humidity of the environment change in the later use process, thereby bringing bad experience to consumers; the filling method is to fill resin in the wood and solidify the resin, after filling the holes of the wood, the expansion coefficient is reduced, and the expansion coefficients of different parts of the wood are more uniform, so that the wood deformation can be permanently restrained.
In the traditional process, the method for preventing the insect damage mainly comprises a soaking method and a coating method; the former is to soak the mildew-proof antibacterial agent in the processing course, and the latter is to brush the mildew-proof antibacterial paint after the wood product is formed. Both of these approaches present certain complications.
Most importantly, in the traditional process, deformation prevention and moth prevention are two independent steps, and the implementation is complicated. Therefore, it is very important to provide a simple and efficient method for preventing rosewood from deforming, being damaged by worms and being mildewed.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the invention provides a rosewood pretreatment process, which can effectively inhibit deformation of rosewood in the preparation and use processes, inhibit mildew and worm damage in the use processes, improve the drying speed and degree of the rosewood and remove uncomfortable smell of the rosewood through component adjustment of a first pretreatment aqueous solution and a second pretreatment aqueous solution and step parameter adjustment.
According to one aspect of the present invention, there is provided a pretreatment process of rosewood, comprising the steps of:
s1, soaking rosewood in a first pretreatment aqueous solution at the temperature of 5-20 ℃;
s2, soaking the rosewood obtained in the step S1 in a second pretreatment aqueous solution at the temperature of-10 to 0 ℃;
s3, drying the rosewood obtained in the step S2;
the solute of the first pretreatment aqueous solution comprises sodium chloride and cuprammonium complex;
the solutes of the second aqueous pretreatment solution include sodium chloride, oxalic acid, and quercetin.
According to a preferred embodiment of the invention, there is at least the following advantageous effect:
(1) Cell walls, cell membranes and fiber filaments in rosewood expand and contract (wet expansion and dry shrinkage) along with the change of humidity, and the ratio of expansion to contraction of the rosewood in different directions is different due to the orientation of the cells and the fiber filaments, so that the rosewood eventually presents defects such as warping, cracking and the like along with the change of temperature.
In the pretreatment process provided by the invention, the cuprammonium complex is added into the first pretreatment aqueous solution, and the cuprammonium complex has certain solubility to cellulose, so that certain cracks (discontinuous positions) can be generated on the cell walls and the fiber filaments of rosewood, and the orientation of the expansion and contraction of the rosewood can be inhibited to a certain extent, and the phenomena such as warping and the like are avoided.
In the pretreatment process provided by the invention, the rosewood is soaked in 5-20 ℃ at first and then soaked in-10-0 ℃, and the cell membrane of the rosewood is also broken and the cell wall of the rosewood is damaged due to the change of volume caused by the phase change or the cold-hot change of the aqueous solution. Thus, the occurrence of warping of rosewood and the like is further suppressed.
(2) The water in the rosewood comprises free water and adsorbed water, the free water is easy to remove, and the adsorbed water is combined with the cell walls of rosewood fiber cells and is difficult to remove.
The pretreatment process of rosewood provided by the invention damages the cell wall to a certain extent, so that the rosewood loses activity, and therefore, the time consumption is shorter and the drying degree is more thorough in the drying process of the step S3.
(3) One of the reasons why rosewood is precious is its color, and pigments in rosewood are easily soluble in organic solvents such as ethanol. In the pretreatment process of the rosewood, the aqueous solution is adopted, so that the color of the rosewood can be kept better than that of the traditional treatment agent containing organic solvents such as ethanol and the like, and similar effects of drying and warping prevention are achieved.
(4) In the pretreatment process provided by the invention, the first pretreatment aqueous solution and the second pretreatment aqueous solution both comprise sodium chloride, so that after the rosewood is dried, the sodium chloride becomes fine crystals and remains in rosewood tissues, on one hand, the effect of supporting and preventing deformation is achieved, on the other hand, the effect of preventing corrosion is achieved, and the sodium chloride is nontoxic.
In addition, the second pretreatment aqueous solution also comprises oxalic acid containing two carboxyl groups and quercetin containing a plurality of hydroxyl groups, and the red wood cellulose also contains a large number of hydroxyl groups, so that the quercetin is grafted in the red wood through the intermediation of the oxalic acid in the pretreatment process, and the quercetin plays roles in preventing worm damage and mildew in the later use process of the red wood product. And the quercetin has longer acting time because of grafting rather than physical adsorption, so that the service life of the obtained rosewood is prolonged.
In some embodiments of the invention, the rosewood comprises at least one of rosewood, sandalwood, rosewood, acid wood, and chicken wing wood.
In some embodiments of the invention, the sour wood comprises at least one of red sour wood, black sour wood, and red sour wood.
In some embodiments of the invention, the red acid wood comprises laos red acid wood.
In some embodiments of the invention, the rosewood comprises burmese rosewood.
In some embodiments of the invention, the pretreatment process further comprises performing surface cleaning of rosewood prior to step S1.
In some embodiments of the invention, the surface cleaning includes peeling and chip cleaning; the method for cleaning the wood chips comprises the step of flushing with a high-pressure water gun.
In some embodiments of the invention, in step S1, the soaking pressure is 135-145 MPa.
As the rosewood is fine and smooth in material quality and hard in texture, the phenomenon of uneven action effect is possible to occur by soaking at normal temperature and normal pressure: that is, the part directly contacted with the first pretreatment aqueous solution has excessive action of the cuprammonium complex, more dissolution of cellulose and the rest has insufficient action. The pressure is adopted in the step S1, so that the problem of uneven action effect can be effectively avoided, and the action duration can be effectively shortened.
In some embodiments of the present invention, in step S1, the soaking period is 5-8 hours.
In the time, the texture of the wood is not damaged on the basis of obtaining a certain warping prevention effect. If it exceeds 8 hours, the texture of rosewood may be destroyed due to the solubility of the cuprammonium complex, affecting the use.
In some embodiments of the invention, in step S1, the concentration of sodium chloride in the first aqueous pretreatment solution is 5 to 26wt%. Within the range, osmotic pressure can be generated with the inside of cells of bacteria, thereby playing the roles of bacteriostasis and sterilization.
In some embodiments of the invention, in step S1, the molar concentration of the copper ammine complex in the first aqueous pretreatment solution is between 8 and 15mmol/L. Thereby, an optimal warping prevention effect can be obtained and damage to the rosewood texture can be avoided to the greatest extent.
In some embodiments of the invention, the first aqueous pretreatment solution is prepared by: after mixing the copper sulfate solution and the ammonia water, a saturated sodium chloride solution was added thereto and the volume was fixed.
In some embodiments of the invention, in the method for preparing the first pretreated aqueous solution, the molar ratio of the copper sulfate to the ammonia water is 1:7-8.
In some embodiments of the invention, the temperature during the preparation of the first aqueous pretreatment solution is 50 to 60 ℃. Thus, the copper ammonia complex can be produced better and is less likely to fail.
In some embodiments of the invention, step S1 is performed in an oxygen-insulated environment. Whereby the effect of the copper ammine complex can be ensured.
In some embodiments of the invention, in step S2, the soaking pressure is 135-145 MPa. The effect of this pressure is the same as that of the pressure in step S1.
In some embodiments of the present invention, in step S2, the soaking period is 18-24 hours. The soaking time can promote the permeation of quercetin and oxalic acid to rosewood.
In some embodiments of the invention, in step S2, the concentration of sodium chloride in the second aqueous pretreatment solution is 5 to 26wt%.
In some embodiments of the invention, in step S2, the concentration of quercetin in the second pretreatment aqueous solution is 1-3 mmol/L.
In some embodiments of the present invention, in step S2, the molar ratio of oxalic acid to quercetin in the second pretreatment aqueous solution is 1:0.3-0.8.
The effect of the excess oxalic acid is to promote a complete reaction of the quercetin.
In some embodiments of the present invention, the pretreatment process of rosewood further comprises washing the rosewood obtained in step S2 with water between step S2 and step S3. The method has the function of cleaning the residual sodium chloride on the surface of the rosewood, and avoiding that sodium chloride crystals separated out from the surface of the rosewood after drying influence the appearance of the rosewood.
In some embodiments of the invention, in step S3, the method of drying is gradient air flow drying.
In some embodiments of the invention, the gradient air flow drying comprises drying with air at 50-60 ℃, 30-40 ℃ and 20-30 ℃ in sequence.
The reasons for the warping and cracking of rosewood also comprise uneven drying, namely when the drying speed is too high, the surface drying speed is faster than that of the interior, and the cracking and warping can occur due to the wet swelling and drying shrinkage. The invention adopts a gradient air flow drying method to gradually dry, so that the problems can be effectively avoided.
The esterification reaction of quercetin and oxalic acid penetrating into the rosewood can be enhanced in the drying process at 50-60 ℃.
In some embodiments of the invention, the humidity of the air is 60 to 75g/m when the temperature of the air is 50 to 60 DEG C 3 。
In some embodiments of the invention, the air travel speed is 1.5m/s-2.5m/s when the air temperature is 50-60 ℃.
In some embodiments of the invention, the drying time is 12 to 36 hours when the air temperature is 50 to 60 ℃.
In some embodiments of the invention, the humidity of the air is 18 to 22g/m when the temperature of the air is 30 to 40 DEG C 3 。
In some embodiments of the invention, the air travel speed is 2m/s-3m/s when the air temperature is 30-40 ℃.
In some embodiments of the invention, the drying time is 12 to 36 hours when the air temperature is 30 to 40 ℃.
In some embodiments of the invention, the humidity of the air is 5 to 10g/m when the temperature of the air is 20 to 30 DEG C 3 。
In some embodiments of the invention, the air travel speed is 4 to 5m/s when the air temperature is 20 to 30 ℃.
In some embodiments of the invention, the drying time is 24 to 48 hours when the air temperature is 20 to 30 ℃.
The product of the advancing speed and the diameter of the pipe is the flow velocity of air.
Therefore, the temperature is gradually reduced to the actual use temperature of the rosewood, and appearance change caused by sudden cooling of high Wen Gongmu can be effectively avoided.
In addition, in each stage, the air humidity is lower than the saturation humidity of the air at the temperature, so that the residual moisture in the rosewood can be gradually and outwards diffused under the gradient effect of the humidity, and a uniform drying method is formed.
Meanwhile, the closer the temperature is to the room temperature (about 25 ℃) the faster the air proceeds, the smaller the proportion of its humidity to the saturation humidity at that temperature, and thus the faster the drying speed. In this temperature range, the rate of drying shrinkage of the rosewood is significantly reduced because the rosewood is already substantially completely dried at 20 to 30 ℃, and thus, even if the drying rate is high, serious deformation of the rosewood is not caused.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Example 1
The embodiment provides a rosewood pretreatment process, which comprises the following specific steps:
D1. raw material preparation:
preparing a first pretreatment aqueous solution: dropwise adding 8mol/L ammonia water into 0.2mol/L copper sulfate solution at 50 ℃, wherein precipitate is generated firstly in the process and disappears, and the molar ratio of copper sulfate to ammonia water is 1:7.5 (calculated by nitrogen in the ammonia water); after sodium chloride was added thereto, the mixture was diluted to a sodium chloride concentration of 7% by weight, and the concentration of the copper ammine complex was 12mmol/L (in terms of the number of copper atoms); cooling to obtain the final product.
Preparing a second pretreatment aqueous solution: sodium chloride, water, oxalic acid and quercetin (CAS: 117-39-5) were mixed to give a sodium chloride concentration of 7wt%, quercetin of 2mmol/L, and a molar ratio of quercetin to oxalic acid of 0.4:1.
Laos Dahong acid wood surface cleaning: the fresh Laos Dahong acid wood is peeled, and then the surface is purged by a high-pressure water gun, so that the residual wood dust is prevented from polluting the first pretreatment aqueous solution or blocking capillary holes on the surface of the wood.
D2. Under the protection of nitrogen, soaking Laos grandiflora subjected to surface cleaning in the step D1 in the first pretreatment aqueous solution obtained in the step D1 at 15 ℃; applying 140MPa pressure in the soaking process, wherein the soaking time is 5 hours;
D3. placing Laos Dahong acid wood obtained in the step D2 into a second pretreatment aqueous solution obtained in the step D1, wherein the temperature is-3 ℃; applying 140MPa pressure in the soaking process, wherein the soaking time is 20 hours; washing the surface with water after taking out;
D4. drying Laos Dahong acid wood obtained in the step D3:
d4a, the temperature is 55 ℃ and the humidity is 65g/m 3 The air of (2) flows through the surface of Lao Dahong acid wood obtained in the step D3 at the advancing speed of 2 m/s; the treatment time is 15h;
d4b bringing the temperature to 35 ℃ and the humidity to 20g/m 3 The air of (2) flows through the surface of Laos Dahong acid wood obtained in the step D4a at the advancing speed of 2.5 m/s; the treatment time is 15h;
d4c at 25deg.C with humidity of 8g/m 3 The air of (2) flows through the surface of Laos Dahong acid wood obtained in the step D4b at the advancing speed of 4.5 m/s; the treatment time was 36h.
Example 2
The embodiment provides a rosewood pretreatment process, which comprises the following specific steps:
the specific process is as follows:
D1. raw material preparation:
preparing a first pretreatment aqueous solution: dropwise adding 8mol/L ammonia water into 0.2mol/L copper sulfate solution at 50 ℃, wherein precipitate is generated firstly in the process and disappears, and the molar ratio of copper sulfate to ammonia water is 1:7.5 (calculated by nitrogen in the ammonia water); after sodium chloride was added thereto, the mixture was diluted to a sodium chloride concentration of 20% by weight, and the concentration of the copper ammine complex was 10mmol/L (in terms of the number of copper atoms); cooling to obtain the final product.
Preparing a second pretreatment aqueous solution: sodium chloride, water, oxalic acid and quercetin (CAS: 117-39-5) were mixed to give a sodium chloride concentration of 7wt%, quercetin of 2mmol/L, and a molar ratio of quercetin to oxalic acid of 0.8:1.
Laos Dahong acid wood is clean on the surface: peeling fresh Laos Dahong acid wood, and purging the surface by a high-pressure water gun to avoid the pollution of residual wood dust to the first pretreatment aqueous solution or the blockage of capillary holes on the surface of Laos Dahong acid wood.
D2. Under the protection of nitrogen, soaking Laos grandiflora subjected to surface cleaning in the step D1 in the first pretreatment aqueous solution obtained in the step D1 at 10 ℃; applying 140MPa pressure in the soaking process, wherein the soaking time is 5 hours;
D3. placing Laos Dahong acid wood obtained in the step D2 into a second pretreatment aqueous solution obtained in the step D1 at the temperature of-10 ℃; applying 140MPa pressure in the soaking process, wherein the soaking time is 20 hours; washing the surface with water after taking out;
D4. drying Laos Dahong acid wood obtained in the step D3:
d4a, the temperature is 55 ℃ and the humidity is 70g/m 3 The air of (2) flows through the surface of Lao Dahong acid wood obtained in the step D3 at the advancing speed of 2 m/s; the treatment time is 30 hours;
d4b bringing the temperature to 35 ℃ and the humidity to 20g/m 3 The air of (2) flows through the surface of Laos Dahong acid wood obtained in the step D4a at the advancing speed of 2.5 m/s; the treatment time is 30 hours;
d4c at 25deg.C with humidity of 8g/m 3 The air of (2) flows through the surface of Laos Dahong acid wood obtained in the step D4b at the advancing speed of 4.5 m/s; the treatment duration was 44h.
Comparative example 1
The comparative example provides a pretreatment process of rosewood, and the specific process is different from that of the example 1:
in step D1, the first aqueous pretreatment solution prepared did not include copper ammonia complex, but was only an aqueous sodium chloride solution having a concentration of 7 wt%.
Comparative example 2
The embodiment provides a rosewood pretreatment process, and the specific process is different from that of embodiment 1:
in step D3, the temperature of the second aqueous pretreatment solution was 5 ℃.
Comparative example 3
The embodiment provides a rosewood pretreatment process, and the specific process is different from that of embodiment 1:
in step D1, sodium chloride is not included in the first aqueous pretreatment solution.
Test examples
This test example tested the performance of Laos Dahong ramulus et folium Picrasmae obtained in examples 1-2 and comparative examples 1-3. Wherein:
the water content reference number is GB/T1931-2009, and the average value of 10 parallel samples is tested;
the antibacterial rate is tested by a standard file with reference number LY/T1926-2010, and the average value of 10 parallel samples is measured;
in a standard file with insect-preventing effect reference numbers GB/T29399-2012, the section 9.2 confirms the insect-preventing effect of wood, and tests are carried out; the specific test method and the standard file are different as follows: in the test block treatment process, the test block is directly subjected to insect test inoculation by using the test block of Laos Dahong acid wood obtained in examples 1-2 and comparative examples 1-3 without soaking the test block with insect repellent again, and the ratio of the number of insects to the number of inoculated insects after 3 months is recorded; the test block used in the control test is Lao Dahong acid wood block after being dried in an oven at 60 ℃ after being subjected to surface cleaning only (step D1 of reference example 1); the number of the parallel test blocks is 10;
wood grain tensile strength reference number GB/T1938-2009.
The appearance is carried out by adopting a visual inspection method, and the appearance is qualified in terms of no cracking and no warping.
The test results are shown in Table 1.
TABLE 1 Properties of Laos Dahong Acer from examples 1-2 and comparative examples 1-3
Figure BDA0003601078240000091
The results in Table 1 show that examples 1-2 have short drying times of the Laos Dahong ramulus et folium Picrasmae obtained within the parameters and steps provided by the invention; the water content is low, and the requirements of different areas on the water content of furniture timber are met; has good antibacterial rate, mothproof performance, tensile strength and appearance.
Comparison of the results of example 1 and comparative example 1 shows that if the first pretreatment aqueous solution does not include the cuprammonium complex, the cell wall or the fiber yarn cannot be effectively destroyed and still has a certain activity, so that the water bound thereon is difficult to remove within the time provided by the present invention, and the obtained laos grand red rambutan wood has a certain warping property after drying due to the activity of the fiber yarn, i.e., the obtained wood does not satisfy the preparation of high-grade mahogany furniture.
Comparison of the results of example 1 and comparative example 2 shows that if the temperature of the second aqueous pretreatment solution is 5 ℃, the temperature difference between the first aqueous pretreatment solution and the second aqueous pretreatment solution is small, and the volume change due to the temperature is insufficient to destroy the function of the cell walls, thereby achieving a technical effect similar to that of comparative example 1.
Comparison of the results of example 1 and comparative example 3 shows that when Laos grandis is transferred to the second pretreatment aqueous solution having a temperature lower than 0 c, the first pretreatment aqueous solution absorbed in Laos grandis is changed from liquid phase to solid phase, and thus the volume change caused by the change damages fibrous tissues such as cell walls, etc., if sodium chloride is not included in the first pretreatment aqueous solution. Therefore, the obtained Laos Dahong ramulus Et folium Picrasmae has excellent water content and appearance. However, this also affects the infiltration of the second aqueous pretreatment solution to Laos grandiflora, wherein both quercetin and sodium chloride remain on the surface of Laos grandiflora, whereby the antibacterial and mothproof properties thereof are significantly reduced.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (6)

1. The pretreatment process of the rosewood is characterized by comprising the following steps of:
s1, soaking rosewood in a first pretreatment aqueous solution at the temperature of 5-20 ℃;
s2, soaking the rosewood obtained in the step S1 in a second pretreatment aqueous solution at the temperature of-10-0 ℃;
s3, drying the rosewood obtained in the step S2;
the solute of the first pretreatment aqueous solution comprises sodium chloride and cuprammonium complex; the preparation method of the first pretreatment aqueous solution comprises the following steps: mixing copper sulfate solution and ammonia water at 50-60 deg.c, adding saturated sodium chloride solution and fixing volume; the molar ratio of the copper sulfate to the ammonia water is 1:7-8;
in the step S1, the soaking pressure is 135-145 MPa, and the soaking time is 5-8 hours;
the solute of the second pretreatment aqueous solution consists of sodium chloride, oxalic acid and quercetin;
in the step S3, the drying method is gradient air flow drying, and the gradient air flow drying comprises drying sequentially at 50-60 ℃, 30-40 ℃ and 20-30 ℃.
2. The pretreatment process according to claim 1, wherein in step S1, the concentration of sodium chloride in the first pretreatment aqueous solution is 5 to 26wt%.
3. The pretreatment process according to claim 1, wherein in step S1, the molar concentration of the copper ammine complex in the first pretreatment aqueous solution is 8 to 15mmol/L.
4. The pretreatment process according to claim 1, wherein in step S2, the soaking pressure is 135 to 145mpa.
5. The pretreatment process according to claim 1, wherein in step S2, the soaking time period is 18 to 24 hours.
6. The pretreatment process according to claim 1, wherein in step S2, the molar ratio of oxalic acid to quercetin in the second pretreatment aqueous solution is 1:0.3-0.8.
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