CN114701029A - Pretreatment process of rosewood - Google Patents

Pretreatment process of rosewood Download PDF

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Publication number
CN114701029A
CN114701029A CN202210403057.0A CN202210403057A CN114701029A CN 114701029 A CN114701029 A CN 114701029A CN 202210403057 A CN202210403057 A CN 202210403057A CN 114701029 A CN114701029 A CN 114701029A
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rosewood
pretreatment
temperature
soaking
aqueous solution
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CN114701029B (en
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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 solute of the first aqueous pretreatment solution comprises sodium chloride and a copper ammonia complex; s2, soaking the rosewood obtained in the step S1 in a second pretreatment aqueous solution at the temperature of-10-0 ℃. Solutes of the second pre-treatment aqueous solution include sodium chloride, oxalic acid and quercetin; and S3, drying the redwood obtained in the step S2. The pretreatment process of the rosewood provided by the invention can effectively inhibit deformation of the rosewood in the preparation and use processes, inhibit mildew and worm damage in the use process, improve the drying speed and degree of the rosewood, and remove unpleasant 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 pretreatment process of rosewood.
Background
With the continuous improvement of living standard, people have higher and higher requirements on the quality of furniture, and tend to consider the solid wood classical furniture with both environmental protection and texture. The solid wood classical furniture is furniture made of rosewood such as sour branches and rosewood, is a general name of rare hardwood high-quality furniture since Ming and Qing dynasty, and is widely popular among people as a high-grade consumer product in the existing life.
The rosewood used for preparing the solid wood classical furniture can be divided into two families, five genera, eight categories and twenty nine categories, and common rosewood mainly comprises dalbergia odorifera, santalum album, rosewood, tabebuia acuminate, chicken wing wood and the like, wherein the rosewood comprises rosewood, black rosewood, laos and dalbergia grandiflora and the like; the rosewood includes Burma rosewood, etc.
The rosewood grows slowly, is hard in material and has a growth period of more than hundreds of years; that is, rosewood is scarce in source and expensive. Therefore, in the processing process of the redwood, on one hand, the unfavorable 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 characterized in that wood is pressed by external force in the processing process to avoid deformation, the method addresses both the symptoms and causes no root cause, and the wood still deforms if the temperature and the humidity of the environment change in the later use process, so that poor experience is brought to consumers; the filling method is to fill resin in the wood and solidify, and after the holes of the wood are filled, the expansion coefficient of the wood is reduced, and the expansion coefficients of different parts of the wood are more uniform, so that the deformation of the wood can be durably inhibited.
In the traditional process, the method for preventing the moth-eaten mainly comprises a soaking method and a coating method; the former is to soak the mildew-proof bacteriostatic agent in the processing process, and the latter is to brush the mildew-proof bacteriostatic coating 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 deformation, moth-eating and mildew.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a redwood pretreatment process, which can effectively inhibit deformation of the redwood in the preparation and use processes, inhibit mildew and worm damage in the use process, improve the drying speed and degree of the redwood and remove unpleasant smell of the redwood by adjusting the components of the first pretreatment aqueous solution and the second pretreatment aqueous solution and adjusting the step parameters.
According to one aspect of the invention, the technology for pretreating the rosewood comprises the following steps:
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 aqueous pretreatment solution comprises sodium chloride and a copper ammonia complex;
the solutes of the second pre-treatment aqueous solution include sodium chloride, oxalic acid, and quercetin.
According to a preferred embodiment of the invention, at least the following advantages are achieved:
(1) the swelling and shrinking (wet swelling and drying and shrinking) of the cell walls, cell membranes and fiber filaments of rosewood occur along with the change of humidity, and the swelling and shrinking rate of rosewood is different according to the orientation of the cells and the fiber filaments, so that the defects of warping, cracking and the like are finally presented along with the change of temperature.
In the pretreatment process provided by the invention, the copper ammonia complex is added into the first pretreatment aqueous solution, and the complex has certain solubility on cellulose, so that certain cracks (discontinuous parts) can be generated on the rosewood cell walls and the cellosilk, the orientation of the rosewood expansion and shrinkage can be inhibited to a certain degree, and the phenomena of warping and the like can be avoided.
In the pretreatment process provided by the invention, the rosewood is soaked in the temperature of 5-20 ℃ and then soaked in the temperature of-10-0 ℃, and due to volume change caused by phase change or cold and hot change of an aqueous solution, cell membranes of the rosewood can be burst, and cell walls of the rosewood are damaged. This further suppresses occurrence of a phenomenon such as warping of the redwood.
(2) The water in the rosewood comprises free water and absorbed water, the free water is easy to remove, and the absorbed water is combined with the cell wall of rosewood fiber cells and is difficult to remove.
The pretreatment process of the rosewood provided by the invention destroys the cell wall to a certain extent and leads the rosewood to lose activity, thereby consuming shorter time and leading the drying degree to be more thorough in the drying process of the step S3.
(3) One reason why rosewood is precious is its color, and the pigments in rosewood are easily soluble in organic solvents such as ethanol. In the pretreatment process of the rosewood, the water solution is adopted, so that compared with the traditional treatment agent containing organic solvents such as ethanol and the like, the color of the rosewood can be kept, and similar drying and warping prevention effects are achieved.
(4) According to 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 is retained in the tissue of the rosewood, on one hand, the effect of supporting and preventing deformation is achieved, on the other hand, the effect of corrosion prevention is achieved, and the sodium chloride is non-toxic.
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 rosewood cellulose also contains a large number of hydroxyl groups, so that the quercetin and the quercetin are grafted in the rosewood through the mediation of the oxalic acid in the pretreatment process, and the quercetin plays the roles of preventing worm damage and mildew during the later use of the rosewood product. And because the grafting effect is adopted, not the physical adsorption effect, the acting time of the quercetin is longer, and the service life of the obtained rosewood is prolonged.
In some embodiments of the invention, the redwood comprises at least one of dalbergia odorifera, pterocarpus santalinus, rosewood, and chicken wing wood.
In some embodiments of the invention, the ramulus et folium ramosicae comprises at least one of ramulus et folium ramosicae, and ramulus et folium ramosicae of black ramulus et folium ramosicae.
In some embodiments of the invention, the big red mahogany comprises Laos big red mahogany.
In some embodiments of the invention, the rosewood comprises burma rosewood.
In some embodiments of the present invention, the pretreatment process further comprises performing surface cleaning of the redwood before step S1.
In some embodiments of the invention, the surface cleaning comprises peeling and chip cleaning; the method for cleaning the wood chips comprises the step of flushing the wood chips by a high-pressure water gun.
In some embodiments of the present invention, in step S1, the pressure of the soaking is 135-145 MPa.
Because the padauk material is exquisite, and the texture is hard, adopts the soaking of normal atmospheric temperature, then probably appears the phenomenon that the effect is inhomogeneous: that is, the part directly contacted with the first aqueous pretreatment solution had excessive action of the copper-ammonia complex, more dissolution of cellulose, and insufficient action of the remaining part. The step S1 of the present invention uses the above pressure, so as to effectively avoid the problem of non-uniform effect and effectively shorten the acting time.
In some embodiments of the invention, in the step S1, the soaking time is 5-8 hours.
In the time, the texture of the wood can be ensured not to be damaged on the basis of obtaining a certain anti-warping effect. If it exceeds 8 hours, the texture of the rosewood may be deteriorated due to the solubility of the copper ammonia complex, which may impair the use.
In some embodiments of the present invention, in the step S1, the concentration of the sodium chloride in the first aqueous pretreatment solution is 5 to 26 wt%. Within the range, the antibacterial agent can generate osmotic pressure with the cells of bacteria, and has the functions of bacteriostasis and sterilization.
In some embodiments of the invention, in step S1, the molar concentration of the copper ammonia complex in the first aqueous pretreatment solution is 8 to 15 mmol/L. This achieves an optimum anti-warping effect and avoids the destruction of the rosewood texture to the greatest possible extent.
In some embodiments of the present invention, the first aqueous pretreatment solution is prepared by: after mixing the copper sulfate solution and the ammonia water, adding a saturated sodium chloride solution into the mixture and fixing the volume.
In some embodiments of the present invention, in the method for preparing the first aqueous pretreatment solution, the molar ratio of the copper sulfate to the ammonia water is 1: 7-8.
In some embodiments of the present invention, the temperature during the preparation of the first aqueous pretreatment solution is 50 to 60 ℃. Therefore, the copper-ammonia complex can be generated better and is not easy to lose efficacy.
In some embodiments of the invention, step S1 is performed in an oxygen-insulated environment. The effect of the copper ammonia complex can thereby be ensured.
In some embodiments of the present invention, in step S2, the pressure of the soaking is 135-145 MPa. The effect of this pressure is the same as that in step S1.
In some embodiments of the present invention, in step S2, the soaking time is 18-24 h. The soaking time can promote penetration of quercetin and oxalic acid to rosewood.
In some embodiments of the present invention, in the step S2, the concentration of sodium chloride in the second aqueous pretreatment solution is 5 to 26 wt%.
In some embodiments of the present invention, in step S2, the concentration of quercetin in the second pre-treatment aqueous solution is 1 to 3 mmol/L.
In some embodiments of the present invention, in step S2, the molar ratio of oxalic acid to quercetin in the second aqueous pretreatment solution is 1: 0.3-0.8.
The effect of the excess of oxalic acid is to promote a complete response of the quercetin.
In some embodiments of the present invention, the redwood pretreatment process further comprises washing the redwood obtained in step S2 with water between step S2 and step S3. The effect is to clean the residual sodium chloride on the surface of the rosewood, and prevent the sodium chloride crystals separated out from the surface of the dried rosewood from influencing the appearance of the rosewood.
In some embodiments of the invention, in step S3, the drying method is gradient airflow drying.
In some embodiments of the present invention, the gradient air drying comprises drying with air at 50-60 ℃, 30-40 ℃ and 20-30 ℃ in sequence.
The reasons for the warping and cracking of the rosewood also include uneven drying, i.e. when the drying speed is too fast, the surface dries faster than the inside, and cracking and warping may occur due to the effect of wet swelling and drying shrinkage. The invention adopts a gradient air flow drying method to gradually dry, which can effectively avoid the problems.
And in the drying process at 50-60 ℃, the esterification reaction of quercetin and oxalic acid which permeate into the rosewood can be strengthened.
In some embodiments of the present invention, the humidity of the air is 60 to 75g/m when the temperature of the air is 50 to 60 ℃3。
In some embodiments of the present invention, the traveling speed of the air is 1.5m/s to 2.5m/s when the air temperature is 50 to 60 ℃.
In some embodiments of the present invention, the drying time is 12 to 36 hours when the air temperature is 50 to 60 ℃.
In some embodiments of the present invention, the humidity of the air is 18 to 22g/m when the temperature of the air is 30 to 40 ℃3。
In some embodiments of the present invention, the traveling speed of the air is 2m/s to 3m/s when the temperature of the air is 30 to 40 ℃.
In some embodiments of the present invention, when the air temperature is 30 to 40 ℃, the drying time is 12 to 36 hours.
In some embodiments of the present invention, the humidity of the air is 5-10 g/m when the temperature of the air is 20-30 ℃3。
In some embodiments of the present invention, the air has a traveling speed of 4 to 5m/s when the air temperature is 20 to 30 ℃.
In some embodiments of the present invention, the drying time is 24 to 48 hours when the air temperature is 20 to 30 ℃.
The product of the traveling speed and the diameter of the pipe is the flow velocity of the air.
Therefore, the temperature is gradually reduced to the actual use temperature of the rosewood, and the appearance change caused by sudden cooling of the high-temperature rosewood can be effectively avoided.
In addition, in each stage, the air humidity is lower than the saturated humidity of the air at the temperature, so that the residual moisture in the rosewood can be gradually diffused outwards under the action of the humidity gradient to form a uniform drying method.
Meanwhile, the faster the temperature is closer to room temperature (about 25 ℃), the smaller the ratio of its humidity to the saturated humidity at that temperature, and thus the faster the drying speed. And because the rosewood is basically and completely dried at the temperature of 20-30 ℃, the drying shrinkage ratio is obviously reduced, and the rosewood cannot be seriously deformed even if the drying speed is higher in the temperature range.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Example 1
The embodiment provides a pretreatment process of rosewood, which comprises the following specific steps:
D1. preparing raw materials:
preparing a first pretreatment aqueous solution: dripping 8mol/L ammonia water into 0.2mol/L copper sulfate solution at 50 ℃, wherein precipitate is generated firstly and disappears later, and the molar ratio of the copper sulfate to the ammonia water is 1:7.5 (calculated by nitrogen in the ammonia water); adding sodium chloride into the solution, and diluting until the concentration of the sodium chloride is 7 wt% and the concentration of the copper ammonia complex is 12mmol/L (calculated by the number of copper atoms); cooling to obtain the product.
Preparing a second pretreatment aqueous solution: mixing sodium chloride, water, oxalic acid and quercetin (CAS: 117-39-5) to obtain sodium chloride with concentration of 7 wt%, quercetin of 2mmol/L, and molar ratio of quercetin to oxalic acid of 0.4: 1.
The surface of Laos bright red rosewood is clean: the method comprises the following steps of peeling fresh Laos big red ramulus cinnamomi, and blowing the surface of the Laos big red ramulus cinnamomi by using a high-pressure water gun to avoid residual wood chips from polluting a first pretreatment aqueous solution or blocking capillary pores on the surface of wood.
D2. Under the protection of nitrogen, soaking the Laos Pistacia chinensis after surface cleaning in the step D1 in the first pretreatment aqueous solution obtained in the step D1; applying 140MPa pressure in the soaking process, wherein the soaking time is 5 h;
D3. d2, placing the Laos Dalmatian rosewood obtained in the step D1 in a second pretreatment aqueous solution at the temperature of-3 ℃; applying 140MPa pressure in the soaking process, wherein the soaking time is 20 h; taking out and washing the surface with water;
D4. drying the Laos and large red rosewood obtained in the step D3:
d4a. the temperature is 55 ℃ and the humidity is 65g/m3The air flows through the surface of the Laos big rosewood obtained in the step D3 at the traveling speed of 2 m/s; the treatment time is 15 h;
d4b.the temperature is 35 ℃ and the humidity is 20g/m3The air of the Laos on the surface of the big red rosewood obtained in the step D4a flows through the surface of the Laos on the surface of the big red rosewood at the traveling speed of 2.5 m/s; the treatment time is 15 h;
d4c, the temperature is 25 ℃, and the humidity is 8g/m3The air of the Laos on the surface of the big red rosewood obtained in the step D4b flows through the surface of the Laos on the surface of the big red rosewood at the traveling speed of 4.5 m/s; the treatment time was 36 h.
Example 2
The embodiment provides a pretreatment process of rosewood, which comprises the following specific processes:
the specific process is as follows:
D1. preparing raw materials:
preparing a first pretreatment aqueous solution: dripping 8mol/L ammonia water into 0.2mol/L copper sulfate solution at 50 ℃, wherein precipitate is generated firstly and disappears later, and the molar ratio of the copper sulfate to the ammonia water is 1:7.5 (calculated by nitrogen in the ammonia water); adding sodium chloride into the solution, and diluting until the concentration of the sodium chloride is 20 wt% and the concentration of the copper ammonia complex is 10mmol/L (calculated by the number of copper atoms); cooling to obtain the product.
Preparing a second pretreatment aqueous solution: mixing sodium chloride, water, oxalic acid and quercetin (CAS: 117-39-5) to obtain sodium chloride with concentration of 7 wt%, quercetin of 2mmol/L, and molar ratio of quercetin to oxalic acid of 0.8: 1.
Laos big red rosewood pre-surface cleaning: the surface of fresh Laos big red sour branch wood is peeled and then swept by a high-pressure water gun, so that residual wood chips are prevented from polluting a first pretreatment aqueous solution or blocking capillary pores on the surface of the Laos big red sour branch wood.
D2. Under the protection of nitrogen, soaking the Laos big red rosewood 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 h;
D3. d2, placing the Laos Dalmatian rosewood obtained in the step D1 in a second pretreatment aqueous solution at the temperature of-10 ℃; applying 140MPa pressure in the soaking process, wherein the soaking time is 20 h; taking out and washing the surface with water;
D4. drying the Laos and large red rosewood obtained in the step D3:
d4a, the temperature is 55 ℃, and the humidity is 70g/m3The air flows through the surface of the Laos big rosewood obtained in the step D3 at the traveling speed of 2 m/s; the treatment time is 30 h;
d4b.the temperature is 35 ℃ and the humidity is 20g/m3The air flows through the surface of the Laos big red rosewood obtained in the step D4a at the traveling speed of 2.5 m/s; the treatment time is 30 h;
d4c, the temperature is 25 ℃, and the humidity is 8g/m3The air flows through the surface of the Laos big red rosewood obtained in the step D4b at the traveling speed of 4.5 m/s; the treatment time was 44 h.
Comparative example 1
The comparison example provides a redwood pretreatment process, and the specific process is different from that of example 1 in that:
in step D1, the first aqueous pretreatment solution was prepared without including the copper ammonia complex, but only as a 7 wt% aqueous solution of sodium chloride.
Comparative example 2
The embodiment provides a pretreatment process of rosewood, and the specific process is different from that of embodiment 1 in that:
in step D3, the temperature of the second aqueous pretreatment solution was 5 ℃.
Comparative example 3
The embodiment provides a pretreatment process of redwood, and the specific process is different from that of embodiment 1 in that:
in step D1, the first aqueous pretreatment solution does not include sodium chloride.
Test examples
The test example tests the performance of Laos big red rosewood obtained in examples 1-2 and comparative examples 1-3. Wherein:
testing the standard file with the reference number of the water content being GB/T1931-2009, and averaging 10 parallel samples;
the bacteriostatic rate is tested by a standard file with the reference number of LY/T1926-2010, and the average value of 10 parallel samples is obtained;
in a standard document with the reference number of the insect-proof effect being GB/T29399-2012, in subsection 9.2, the insect-proof effect of the wood is confirmed and tested; the difference between the specific test method and the standard file is as follows: in the test block treatment process, the test block is not required to be soaked in the insect-resist agent again, namely, the test block of Laos Dahong sour ramus obtained in examples 1-2 and comparative examples 1-3 is directly used for test insect inoculation, and the ratio of the number of insects to the number of inoculated test insects after 3 months is recorded; the control test used a panel of Laos Dahong Zhimu panel that was oven dried at 60 ℃ after only surface cleaning (reference example 1, step D1); the number of the parallel test blocks is 10;
the wood grain tensile strength is carried out by reference to a standard document with the GB/T1938-2009.
The appearance is measured by a visual method, and the product is qualified as being free of cracking and warping.
The test results are shown in table 1.
Table 1 Properties of Laos big red branch wood obtained in examples 1-2 and comparative examples 1-3
Figure BDA0003601078240000091
The results in Table 1 show that in the examples 1-2, the drying time of the Laos big red rosewood is short 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 the furniture wood are met; has good antibacterial rate, moth-proofing property, tensile strength and appearance.
A comparison of the results of example 1 and comparative example 1 shows that if the first aqueous pretreatment solution does not include the copper ammonia complex, the cell walls or the fiber threads cannot be effectively destroyed, and still have a certain activity, so that the water bound thereto is difficult to remove within the time provided by the present invention, and the obtained laos have a certain warping property after drying due to the activity of the fiber threads, i.e., the obtained wood does not satisfy the preparation of high-grade redwood 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 not sufficient to destroy the function of the cell walls, thereby obtaining a technical effect similar to that of comparative example 1.
Comparison of the results of example 1 and comparative example 3 shows that if sodium chloride is not included in the first aqueous pretreatment solution, the first aqueous pretreatment solution absorbed in laos big sour branches changes from a liquid phase to a solid phase when the laos big sour branches are transferred to the second aqueous pretreatment solution at a temperature lower than 0 ℃, and thus the volume change caused by this destroys fibrous tissues such as cell walls. Therefore, the Laos big red ramulus et folium seu ramulus Cinnamomi has excellent water content and appearance. However, the infiltration of the second pretreatment aqueous solution on Laos Dahong sour ramus is also influenced, and the quercetin and sodium chloride in the second pretreatment aqueous solution stay on the surface of Laos Dahong ramus, so that the bacteriostasis rate and the anti-moth performance of the Laos Dahong ramus are obviously reduced.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims (10)

1. The pretreatment process of the rosewood is characterized by comprising the following steps:
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 aqueous pretreatment solution comprises sodium chloride and a copper ammonia complex;
the solutes of the second pre-treatment aqueous solution include sodium chloride, oxalic acid, and quercetin.
2. The pretreatment process according to claim 1, wherein in step S1, the pressure of the soaking is 135-145 MPa.
3. The pretreatment process according to claim 1, wherein in the step S1, the soaking time is 5-8 hours.
4. The pretreatment process according to claim 1, wherein in step S1, the concentration of sodium chloride in the first aqueous pretreatment solution is 5 to 26 wt%.
5. The pretreatment process according to claim 1, wherein in step S1, the molar concentration of the copper ammonia complex in the first aqueous pretreatment solution is 8 to 15 mmol/L.
6. The pretreatment process according to claim 1, wherein in step S2, the pressure of the soaking is 135-145 MPa.
7. The pretreatment process according to claim 1, wherein in the step S2, the soaking time is 18-24 hours.
8. 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.
9. The pretreatment process of any one of claims 1 to 8, wherein in step S3, the drying method is gradient air drying.
10. The pretreatment process according to claim 9, wherein the gradient air drying comprises drying with air at 50-60 ℃, 30-40 ℃ and 20-30 ℃ in sequence.
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CN104552518A (en) * 2015-01-10 2015-04-29 陈霞 Dehumidification process of redwood
CN106671224A (en) * 2015-08-06 2017-05-17 刘运武 Cold-resistant anti-cracking treatment method of rosewood
CN107363941A (en) * 2017-08-23 2017-11-21 刘明 A kind of method for lifting redwood anti crack performance
CN109397442A (en) * 2018-10-19 2019-03-01 临泉县福隆木制品有限公司 A kind of processing method of mould proof wooden table-ware
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060162611A1 (en) * 2003-06-17 2006-07-27 Richardson H W Inhibition of calcium and magnesium precipitation from wood preservaties
JP2013063619A (en) * 2011-09-20 2013-04-11 Asao Shimazaki Woody decorative sheet and production method thereof
CN102814848A (en) * 2012-09-06 2012-12-12 中国林业科学研究院木材工业研究所 Copper azole wood preservative and preparation method thereof
CN104552518A (en) * 2015-01-10 2015-04-29 陈霞 Dehumidification process of redwood
CN106671224A (en) * 2015-08-06 2017-05-17 刘运武 Cold-resistant anti-cracking treatment method of rosewood
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