CN113524372A - Method for changing weight, hardness and internal and external color transparency consistency of soft wood - Google Patents
Method for changing weight, hardness and internal and external color transparency consistency of soft wood Download PDFInfo
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- CN113524372A CN113524372A CN202110805499.3A CN202110805499A CN113524372A CN 113524372 A CN113524372 A CN 113524372A CN 202110805499 A CN202110805499 A CN 202110805499A CN 113524372 A CN113524372 A CN 113524372A
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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
- B27K3/0207—Pretreatment of wood before impregnation
- B27K3/0214—Drying
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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
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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
- B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
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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
- B27K3/16—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
- B27K3/343—Heterocyclic 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
- B27K3/36—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
- B27K3/52—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
- B27K5/02—Staining or dyeing wood; Bleaching 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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a method for changing the weight and hardness of soft wood and ensuring the transparency and consistency of internal and external colors, which comprises the following steps of S1: s2, preparing a high-molecular curing liquid; s3, immersing the small molecule dye; s4, preparing an immersion liquid; s7, secondary drying: simply washing the surface of the impregnated wood, putting the wood into a drying kiln, drying until the water content is 8-12%, and taking the wood out of the kiln for later use; the method changes the physical, chemical and biological properties of the wood by crosslinking and curing the interior of the wood into the macromolecular curing solution, and the wood is treated by the method, so that the treated wood keeps the texture feeling of the wood, the interior and exterior colors of the wood are uniform, the color is attractive, and the color fastness is good; the dimensional stability of the wood is improved, the physical and mechanical properties are improved, and the service life of the wood is prolonged. The wood treated by the method not only can be transparent and hardened, but also can be transparent and color-changed, and the texture is highlighted, and no formaldehyde is released, thereby meeting the national environmental protection requirement.
Description
Technical Field
The invention belongs to the technical field of wood processing, and particularly relates to a method for changing the weight and hardness of soft wood and enabling the inside and outside colors to be transparent and consistent.
Background
With the improvement of living standard of people, the demand of decoration of living rooms on precious wood such as black walnuts, teak, ebony and the like is increased. However, the natural forest resources are decreasing day by day, the supply of the natural forest large-diameter grade high-quality materials and the valuable furniture materials is decreasing day by day, and in order to meet the requirements of people and improve the decorative and aesthetic values of wooden products, the modification and dyeing of the wood are necessary. Therefore, by dyeing the wood, common wood is dyed to be close to the color of natural precious wood to imitate the precious wood, thereby improving the use value of the wood and meeting the requirements of people on color diversity, not only making up for the shortage of natural precious wood resources, but also improving the utilization value and the added value of the fast-growing tree species wood. The high-grade wood is attractive to consumers in color, luster and patterns, and is also a favored reason for the excellent service performance.
Wood dyeing is an effective method for realizing the simulation of the wood color of precious tree species by common wood, and chemical modification is a main means for simulating the wood property of the precious tree species and is also the basis of high-end wood. By chemical modification it is possible to: 1. the density of the wood is improved, and the thick and heavy feeling of the wood is increased; 2. the dimensional stability, hardness, elastic modulus and the like of the wood are improved to achieve the use performance of the precious wood, 3, the service life of the wood is prolonged. Although the properties of the precious wood can be realized by chemical modification, the wood modification commonly seen in the market can only change the color alone or change the hardness and weight of the wood; but can not change the weight, the hardness and the permeability of the internal and external colors of the wood simultaneously.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
In order to achieve the above object, the technical scheme adopted by the invention is that the invention provides a method for changing the weight, the hardness and the transparent consistency of the inner color and the outer color of soft wood, which comprises the following steps,
s1, vacuum dehumidification: putting the sawn wet wood blocks into a vacuum dehumidifying machine, and carrying out vacuum dehumidifying treatment on the wood blocks until the water content is 8-15% for later use;
s2, preparing a high-molecular curing liquid;
s3, immersing the small molecule dye; selecting proper micromolecular dye, and adding the micromolecular dye in the preparation process of the macromolecular curing liquid;
s3, preparation of immersion liquid: a. putting 1.8-2.5 parts of water by mass into a stirrer, and heating to 30-50 ℃; b. adding a macromolecular curing liquid into which a micromolecular dye is immersed in an amount of 1 part by mass, heating the mixed liquid to 40-60 ℃, and uniformly stirring to obtain a liquid medicine;
s4, wood vacuum negative pressure catheter drainage: placing the sawn timber square timber with the water content within 8-15% in a soaking tank, sealing, and keeping the pressure at minus 0.08-minus 0.095MPa for 10-30 minutes; after the liquid medicine is filled in the impregnation tank, starting a high-pressure pump to perform pressure injection on the liquid medicine in the tank, stopping the pressure injection when the pressure reaches 1.5-3.5 MPa, and keeping the pressure for 2-4.5 hours;
s5, heat treatment, crosslinking and curing: the wood after vacuum negative pressure treatment is placed at 500-700 ℃ for heat treatment for 1-2h, so that the macromolecular curing liquid immersed by the micromolecular dye and the fiber tissue in the wood body are crosslinked and cured;
s6, discharging the wood: discharging the liquid medicine after pressure infusion, standing for 10-30 minutes, opening a tank door and taking out the wood;
s7, secondary drying: and (3) after simply washing the surface of the impregnated wood, putting the wood into a drying kiln, drying until the water content is 8-12%, and taking the wood out of the kiln for later use.
Preferably, the preparation of the polymer curing liquid in step S2 includes the following steps:
a. preparing raw materials for producing the polymer curing liquid: the polymer curing liquid is prepared from the following raw materials in percentage by mass: 300 portions of Polyformaldehyde (POM), 900 to 1050 portions of urea, 0.3 to 0.6 portion of sodium carboxymethylcellulose, 80 to 95 portions of ammonia water, 105 to 125 portions of melamine, 95 to 115 portions of polyvinyl alcohol, 0.9 to 1.2 portions of hexamethylenetetramine and 0.5 to 0.9 portion of diethylene glycol;
b. feeding for the first time: adding formaldehyde, polyvinyl alcohol, ammonia water, hexamethylenetetramine, melamine and sodium carboxymethylcellulose into a reaction kettle according to the proportion of the parts, adding one third of urea of the total amount of the urea, stirring uniformly, and adjusting the pH value to 8.5-9.0 by using sodium hydroxide;
c. secondary urea: heating to 80-85 deg.C, maintaining for 10-30 min, adding one third of urea, and maintaining for 25-30 min;
d. and (3) urea for the third time: adding the remaining one third of urea when the reaction temperature reaches 90-95 ℃, and keeping for 30-35 minutes; adding diethylene glycol when the temperature is cooled to 55-60 ℃; (vi) Cooling discharge: continuously cooling to below 45 ℃ to discharge the materials;
e. cooling and discharging: and continuously cooling to 50 ℃, adjusting the pH value to about 7.5-8 by using glacial acetic acid, and continuously cooling to below 45 ℃ to discharge.
Preferably, the optimal weight parts of the raw materials in the polymer curing liquid are as follows: the optimal weight parts of the raw materials in the high-molecular curing liquid are as follows: 330 parts of polyformaldehyde, 970 parts of urea, 0.5 part of sodium carboxymethylcellulose, 90 parts of ammonia water, 110 parts of melamine, 105 parts of polyvinyl alcohol, 1.1 part of hexamethylenetetramine and 0.7 part of diethylene glycol.
Preferably, the alkaline substance for adjusting the pH value during the preparation of the polymer curing liquid is sodium hydroxide.
Preferably, the acidic substance for adjusting the pH value during the preparation of the polymer curing liquid is one or more of glacial acetic acid, formic acid, oxalic acid and ammonium chloride.
Preferably, after the first feeding in the preparation process of the liquid medicine, water with the mass part ratio of less than or equal to 200.0 parts is added according to the dissolution condition of the materials in the reaction kettle.
Preferably, before the liquid medicine preparation step a, 0.1 to 0.3 parts by weight of maltodextrin is put into a stirrer.
Preferably, the small molecule color modifier is: cationic reactive dye bright red, cationic reactive dye carbon black, cationic reactive dye golden yellow and cationic reactive dye royal blue.
Has the advantages that: compared with the prior art, the method has the advantages and positive effects that the physical, chemical and biological properties of the wood are changed by crosslinking and curing the interior of the wood into the high-molecular curing liquid, and the wood is treated by using the method, so that the treated wood retains the texture feeling of the wood, the interior and exterior colors of the wood are uniform, the color and luster are attractive, and the color fastness is good; the dimensional stability of the wood is improved, the physical and mechanical properties are improved, and the service life of the wood is prolonged. The wood treated by the method not only can be transparent and hardened, but also can be transparent and color-changed, and the texture is highlighted, and no formaldehyde is released, thereby meeting the national environmental protection requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a flowchart of a method for changing the weight, hardness, and internal and external color transparency of soft wood according to this embodiment;
fig. 2 is a flow chart of the preparation of the polymer curing liquid in the method for changing the weight, hardness, and internal and external color transparency of the soft wood according to this embodiment.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
Example 1
A method for changing the weight, hardness and internal and external color transparency of soft wood includes such steps as,
s1, vacuum dehumidification: putting the sawn wet wood blocks into a vacuum dehumidifying machine, and carrying out vacuum dehumidifying treatment on the wood blocks until the water content is 8-15% for later use;
s2, preparing a high-molecular curing liquid;
s3, immersing the small molecule dye; selecting proper micromolecular dye, and adding the micromolecular dye in the preparation process of the macromolecular curing liquid;
s3, preparation of immersion liquid: a. putting 1.8-2.5 parts of water by mass into a stirrer, and heating to 30-50 ℃; b. adding a macromolecular curing liquid into which a micromolecular dye is immersed in an amount of 1 part by mass, heating the mixed liquid to 40-60 ℃, and uniformly stirring to obtain a liquid medicine;
s4, wood vacuum negative pressure catheter drainage: placing the sawn timber square timber with the water content within 8-15% in a soaking tank, sealing, and keeping the pressure at minus 0.08-minus 0.095MPa for 10-30 minutes; after the liquid medicine is filled in the impregnation tank, starting a high-pressure pump to perform pressure injection on the liquid medicine in the tank, stopping the pressure injection when the pressure reaches 1.5-3.5 MPa, and keeping the pressure for 2-4.5 hours;
s5, heat treatment, crosslinking and curing: the wood after vacuum negative pressure treatment is placed at 500-700 ℃ for heat treatment for 1-2h, so that the macromolecular curing liquid immersed by the micromolecular dye and the fiber tissue in the wood body are crosslinked and cured;
s6, discharging the wood: discharging the liquid medicine after pressure infusion, standing for 10-30 minutes, opening a tank door and taking out the wood;
s7, secondary drying: and (3) after simply washing the surface of the impregnated wood, putting the wood into a drying kiln, drying until the water content is 8-12%, and taking the wood out of the kiln for later use.
The preparation steps of the polymer curing liquid in the above embodiment are as follows:
examples 1 to 1
The preparation method of the polymer curing liquid comprises the following steps: a. preparing raw materials for producing the polymer curing liquid: the polymer curing liquid is prepared from the following raw materials in percentage by mass: 300 parts of Polyformaldehyde (POM), 900 parts of urea, 0.3 part of sodium carboxymethylcellulose, 80 parts of ammonia water, 105 parts of melamine, 95 parts of polyvinyl alcohol, 0.9 part of hexamethylenetetramine, 0.5 part of diethylene glycol and 300 parts of a small molecule color modifier;
b. feeding for the first time: adding formaldehyde, polyvinyl alcohol, ammonia water, hexamethylenetetramine, melamine and sodium carboxymethylcellulose into a reaction kettle according to the proportion of the parts, adding one third of urea of the total amount of the urea, stirring uniformly, and adjusting the pH value to 8.5-9.0 by using sodium hydroxide;
c. secondary urea: heating to 80-85 deg.C, maintaining for 10-30 min, adding one third of urea, and maintaining for 25-30 min;
d. and (3) urea for the third time: when the reaction temperature reaches 90-95 ℃, the remaining one third of urea is added finally, and at the moment, 40 parts of borax, 20 parts of boric acid, 15 parts of magnesium chloride and a small molecule color modifier are added at the same time when the color of the high polymer curing liquid needs to be correspondingly adjusted; keeping for 30-35 minutes; adding diethylene glycol when the temperature is cooled to 55-60 ℃;
e. cooling and discharging: cooling to 50 ℃, adjusting the pH value to 7.5-8 by using glacial acetic acid, and then continuously cooling to below 45 ℃ to discharge the materials, thus finishing discharging.
Further, the alkaline substance for adjusting the pH value in the preparation of the polymer curing liquid is sodium hydroxide.
Further, the acidic substance for adjusting the pH value during the preparation of the polymer curing liquid is one or more of glacial acetic acid, formic acid, oxalic acid and ammonium chloride.
Furthermore, after one-time feeding in the preparation process of the liquid medicine, water with the mass part ratio of less than or equal to 200.0 parts is added according to the dissolution condition of the materials in the reaction kettle.
Further, before the liquid medicine preparation step a, 0.1 to 0.3 parts by weight of maltodextrin is put into a stirrer.
Further, the small molecule color modifier is: cationic reactive dye bright red, cationic reactive dye carbon black, cationic reactive dye golden yellow and cationic reactive dye royal blue.
Examples 1 to 2
The preparation method of the polymer curing liquid comprises the following steps: a. preparing raw materials for producing the polymer curing liquid: the polymer curing liquid is prepared from the following raw materials in percentage by mass: 350 parts of Polyformaldehyde (POM), 1050 parts of urea, 0.6 part of sodium carboxymethylcellulose, 95 parts of ammonia water, 125 parts of melamine, 115 parts of polyvinyl alcohol, 1.2 parts of hexamethylenetetramine, 00.9 parts of diethylene glycol and 350 parts of a small molecule color modifier;
b. feeding for the first time: adding formaldehyde, polyvinyl alcohol, ammonia water, hexamethylenetetramine, melamine and sodium carboxymethylcellulose into a reaction kettle according to the proportion of the parts, adding one third of urea of the total amount of the urea, stirring uniformly, and adjusting the pH value to 8.5-9.0 by using sodium hydroxide;
c. secondary urea: heating to 80-85 deg.C, maintaining for 10-30 min, adding one third of urea, and maintaining for 25-30 min;
d. and (3) urea for the third time: when the reaction temperature reaches 90-95 ℃, the remaining one third of urea is added finally, and at the moment, when the color of the macromolecular curing liquid needs to be correspondingly adjusted, 60 parts of borax, 30 parts of boric acid, 25 parts of magnesium chloride and a micromolecular color modifier are also added; keeping for 30-35 minutes; adding diethylene glycol when the temperature is cooled to 55-60 ℃;
e. cooling and discharging: and continuously cooling to 50 ℃, adjusting the pH value to about 7.5-8 by using glacial acetic acid, and continuously cooling to below 45 ℃ to discharge.
Further, the optimal weight parts of the raw materials in the polymer curing liquid are as follows: the optimal weight parts of the raw materials in the high-molecular curing liquid are as follows: 330 parts of polyformaldehyde, 970 parts of urea, 0.5 part of sodium carboxymethylcellulose, 90 parts of ammonia water, 110 parts of melamine, 105 parts of polyvinyl alcohol, 1.1 part of hexamethylenetetramine and 0.7 part of diethylene glycol.
Further, the alkaline substance for adjusting the pH value in the preparation of the polymer curing liquid is sodium hydroxide.
Further, the acidic substance for adjusting the pH value during the preparation of the polymer curing liquid is one or more of glacial acetic acid, formic acid, oxalic acid and ammonium chloride.
Furthermore, after one-time feeding in the preparation process of the liquid medicine, water with the mass part ratio of less than or equal to 200.0 parts is added according to the dissolution condition of the materials in the reaction kettle.
Further, before the liquid medicine preparation step a, 0.1 to 0.3 parts by weight of maltodextrin is put into a stirrer.
Further, the small molecule color modifier is: cationic reactive dye bright red, cationic reactive dye carbon black, cationic reactive dye golden yellow and cationic reactive dye royal blue
Examples 1 to 3
The preparation method of the polymer curing liquid comprises the following steps: a. preparing raw materials for producing the polymer curing liquid: the polymer curing liquid is prepared from the following raw materials in percentage by mass: 325 parts of Polyformaldehyde (POM), 1025 parts of urea, 0.45 part of sodium carboxymethylcellulose, 90 parts of ammonia water, 115 parts of melamine, 105 parts of polyvinyl alcohol, 1.05 parts of hexamethylenetetramine, 0.7 part of diethylene glycol and 325 parts of a small molecule color modifier;
b. feeding for the first time: adding formaldehyde, polyvinyl alcohol, ammonia water, hexamethylenetetramine, melamine and sodium carboxymethylcellulose into a reaction kettle according to the proportion of the parts, adding one third of urea of the total amount of the urea, stirring uniformly, and adjusting the pH value to 8.5-9.0 by using sodium hydroxide;
c. secondary urea: heating to 80-85 deg.C, maintaining for 10-30 min, adding one third of urea, and maintaining for 25-30 min;
d. and (3) urea for the third time: adding the remaining one third of urea when the reaction temperature reaches 90-95 ℃, and adding 50 parts of borax, 25 parts of boric acid, 20 parts of magnesium chloride and a small molecule color modifier when the color of the high polymer curing liquid needs to be correspondingly adjusted; keeping for 30-35 minutes; adding diethylene glycol when the temperature is cooled to 55-60 ℃;
e. cooling and discharging: and continuously cooling to 50 ℃, adjusting the pH value to about 7.5-8 by using glacial acetic acid, and continuously cooling to below 45 ℃ to discharge.
Further, the optimal weight parts of the raw materials in the polymer curing liquid are as follows: the optimal weight parts of the raw materials in the high-molecular curing liquid are as follows: 330 parts of polyformaldehyde, 970 parts of urea, 0.5 part of sodium carboxymethylcellulose, 90 parts of ammonia water, 110 parts of melamine, 105 parts of polyvinyl alcohol, 1.1 part of hexamethylenetetramine and 0.7 part of diethylene glycol.
Further, the alkaline substance for adjusting the pH value in the preparation of the polymer curing liquid is sodium hydroxide.
Further, the acidic substance for adjusting the pH value during the preparation of the polymer curing liquid is one or more of glacial acetic acid, formic acid, oxalic acid and ammonium chloride.
Furthermore, after one-time feeding in the preparation process of the liquid medicine, water with the mass part ratio of less than or equal to 200.0 parts is added according to the dissolution condition of the materials in the reaction kettle.
Further, before the liquid medicine preparation step a, 0.1 to 0.3 parts by weight of maltodextrin is put into a stirrer.
In specific implementation, the small molecule color modifier is: cationic reactive dye bright red, cationic reactive dye carbon black, cationic reactive dye golden yellow and cationic reactive dye royal blue;
in addition, other small molecule color modifiers may also be used in this embodiment.
The method changes the physical, chemical and biological properties of the wood by crosslinking and curing the interior of the wood into the macromolecular curing solution, and the wood is treated by the method, so that the treated wood keeps the texture feeling of the wood, the interior and exterior colors of the wood are uniform, the color is attractive, and the color fastness is good; the dimensional stability of the wood is improved, the physical and mechanical properties are improved, and the service life of the wood is prolonged. The wood treated by the method not only can be transparent and hardened, but also can be transparent and color-changed, and the texture is highlighted, and no formaldehyde is released, thereby meeting the national environmental protection requirement.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (8)
1. A method for changing the weight, hardness and internal and external color transparency of soft wood is characterized by comprising the following steps,
s1, vacuum dehumidification: putting the sawn wet wood blocks into a vacuum dehumidifying machine, and carrying out vacuum dehumidifying treatment on the wood blocks until the water content is 8-15% for later use;
s2, preparing a high-molecular curing liquid;
s3, immersing the small molecule dye; selecting proper micromolecular dye, and adding the micromolecular dye in the preparation process of the macromolecular curing liquid;
s3, preparation of immersion liquid: a. putting 1.8-2.5 parts of water by mass into a stirrer, and heating to 30-50 ℃; b. adding a macromolecular curing liquid into which a micromolecular dye is immersed in an amount of 1 part by mass, heating the mixed liquid to 40-60 ℃, and uniformly stirring to obtain a liquid medicine;
s4, wood vacuum negative pressure catheter drainage: placing the sawn timber square timber with the water content within 8-15% in a soaking tank, sealing, and keeping the pressure at minus 0.08-minus 0.095MPa for 10-30 minutes; after the liquid medicine is filled in the impregnation tank, starting a high-pressure pump to perform pressure injection on the liquid medicine in the tank, stopping the pressure injection when the pressure reaches 1.5-3.5 MPa, and keeping the pressure for 2-4.5 hours;
s5, heat treatment, crosslinking and curing: the wood after vacuum negative pressure treatment is placed at 500-700 ℃ for heat treatment for 1-2h, so that the macromolecular curing liquid immersed by the micromolecular dye and the fiber tissue in the wood body are crosslinked and cured;
s6, discharging the wood: discharging the liquid medicine after pressure infusion, standing for 10-30 minutes, opening a tank door and taking out the wood;
s7, secondary drying: and (3) after simply washing the surface of the impregnated wood, putting the wood into a drying kiln, drying until the water content is 8-12%, and taking the wood out of the kiln for later use.
2. The method for changing the weight, the hardness and the inside and outside color transparency consistency of soft wood according to claim 1, wherein the macromolecule curing liquid in step S2 is prepared by the following steps:
a. preparing raw materials for producing the polymer curing liquid: the polymer curing liquid is prepared from the following raw materials in percentage by mass: 300 portions of Polyformaldehyde (POM), 900 to 1050 portions of urea, 0.3 to 0.6 portion of sodium carboxymethylcellulose, 80 to 95 portions of ammonia water, 105 to 125 portions of melamine, 95 to 115 portions of polyvinyl alcohol, 0.9 to 1.2 portions of hexamethylenetetramine and 0.5 to 0.9 portion of diethylene glycol;
b. feeding for the first time: adding formaldehyde, polyvinyl alcohol, ammonia water, hexamethylenetetramine, melamine and sodium carboxymethylcellulose into a reaction kettle according to the proportion of the parts, adding one third of urea of the total amount of the urea, stirring uniformly, and adjusting the pH value to 8.5-9.0 by using sodium hydroxide;
c. secondary urea: heating to 80-85 deg.C, maintaining for 10-30 min, adding one third of urea, and maintaining for 25-30 min;
d. and (3) urea for the third time: adding the remaining one third of urea when the reaction temperature reaches 90-95 ℃, and keeping for 30-35 minutes; adding diethylene glycol when the temperature is cooled to 55-60 ℃;
e. cooling and discharging: and continuously cooling to 50 ℃, adjusting the pH value to about 7.5-8 by using glacial acetic acid, and continuously cooling to below 45 ℃ to discharge.
3. The method for changing the weight, the hardness and the internal and external color transparency consistency of the soft wood according to claim 2, wherein the optimal parts by weight of the raw materials in the high polymer curing liquid are as follows: the optimal weight parts of the raw materials in the high-molecular curing liquid are as follows: 330 parts of polyformaldehyde, 970 parts of urea, 0.5 part of sodium carboxymethylcellulose, 90 parts of ammonia water, 110 parts of melamine, 105 parts of polyvinyl alcohol, 1.1 part of hexamethylenetetramine and 0.7 part of diethylene glycol.
4. The method of claim 2, wherein the alkaline substance for adjusting pH value during the preparation of the polymer curing liquid is sodium hydroxide.
5. The method for changing the weight, the hardness and the internal and external color permeability of soft wood according to claim 2, wherein the acidic substance for adjusting the pH value during the preparation of the polymer curing liquid is one or more of glacial acetic acid, formic acid, oxalic acid and ammonium chloride.
6. The method for changing the weight, the hardness and the inside and outside color transparency of the soft wood according to claim 1, wherein water with the mass part ratio of not more than 200.0 parts is added according to the dissolution condition of materials in a reaction kettle after one-time feeding in the preparation process of the liquid medicine.
7. The method for changing the weight, hardness and internal and external color of soft wood according to claim 1, wherein the maltodextrin with the weight ratio of 0.1-0.3 part is added into the stirrer before the step of preparing the liquid medicine.
8. The method for changing the weight, the hardness and the inside and outside color permeability of soft wood according to claim 1, wherein the small molecule color modifier is: cationic reactive dye bright red, cationic reactive dye carbon black, cationic reactive dye golden yellow and cationic reactive dye royal blue.
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| CN101306546A (en) * | 2007-05-18 | 2008-11-19 | 郭明辉 | Novel pearly wood single plate coloring agent |
| CN102756408A (en) * | 2011-04-26 | 2012-10-31 | 永港伟方（北京）科技股份有限公司 | Wood grade-improving modification method |
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Application publication date: 20211022 |