CN110948626A - Preparation and method of bamboo green-keeping agent - Google Patents
Preparation and method of bamboo green-keeping agent Download PDFInfo
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- CN110948626A CN110948626A CN201911259175.3A CN201911259175A CN110948626A CN 110948626 A CN110948626 A CN 110948626A CN 201911259175 A CN201911259175 A CN 201911259175A CN 110948626 A CN110948626 A CN 110948626A
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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
- B27K3/34—Organic impregnating agents
- B27K3/36—Aliphatic compounds
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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
- 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
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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
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a preparation method of a bamboo green-keeping agent and a preparation method thereof. The bamboo green-keeping agent comprises two treating agents, namely a treating agent A and a treating agent B; the treating agent A is mainly compounded by chitosan, copper salt and acid; the treating agent B is mainly compounded by copper salt and ammonia water or organic amine. The bamboo processed by the green-keeping agent of the invention has dark green bamboo, can keep green, has obvious luster and light resistance, improves the color durability of the processed material, has simple processing method and no toxicity, and the processed material has no pungent smell.
Description
Technical Field
The invention relates to a preparation method of a bamboo green-keeping agent and a preparation method thereof, aiming at keeping green of bamboo green for a long time and preventing the bamboo green from fading due to the influence of illumination, biology and the like.
Background
Bamboo is a biomass resource widely distributed in china. The bamboo material as the raw material can be used for bamboo buildings, bamboo artware, bamboo ornaments, bamboo artificial boards, composite materials and the like, and has wide application fields. The green color of the newly harvested bamboo on the surface is green to dark green, the color is bright, and the aesthetic ornamental value is higher. However, with the prolonging of the service time, the color of the surf green on the surface of the bamboo material is gradually changed from green or dark green to gray or yellow, and the color is gradually dull. If the bamboo is processed by a certain technology, the natural green of the bamboo is kept, and the bamboo does not fade in indoor and outdoor environments, so that the color of the bamboo can be enriched, the application field of the bamboo is widened, and the use value of the bamboo is improved.
The green keeping of bamboo wood refers to a technology for keeping the original green of bamboo wood through chemical and physical treatment. In the prior art, copper ions are mainly used for replacing magnesium ions in chlorophyll of bamboo to protect the green of bamboo, such as copper sulfate, copper naphthenate, copper acetate, copper-chromium complex and the like. However, these methods have disadvantages such as easy discoloration, heavy odor of the treated material, and high toxicity.
There are patents in which chitosan is reacted with copper salt, such as copper chloride, copper sulfate, etc. to prepare chitosan copper salt, which is dissolved in acetic acid, hydrochloric acid, etc. to prepare antiseptic and mildew preventive for protecting wood and bamboo against decay fungi, mold, termite, etc.
There are few reports on green-keeping treatment of bamboo. 0.5 percent of copper sulfate is used as a treatment solution, and the mixture is soaked in a tank with the pressure of 0.005-0.01 MPa for 2-3 h, and then soaked for 12h under normal pressure and dried to obtain light green. However, the color obtained by only using copper sulfate is light and is difficult to meet the requirement. The bamboo wood is treated by a methanol or ethanol solution of copper salt for Zhang Shang Zhen, the treated bamboo wood is green, the effect is better than that of ethanol by using methanol as a solvent, but the color stability of the bamboo wood is not further described. And the method is toxic to human body due to the use of methanol. The Zhang Shang Zhen adopts chromium oxide-phosphoric acid, chromium oxide-copper salt-arsenic pentoxide to carry out green-keeping treatment on the original bamboo, and the chromium salt has certain harm to the environment and human bodies.
The chitosan derived from the waste such as shrimp and crab shells is a natural and environment-friendly renewable resource and is widely applied to the pharmaceutical and food industries. According to the application, chitosan and copper salt are combined to prepare the green raw bamboo, and the prepared green raw bamboo has good light resistance and antibacterial effect because the chitosan has antibacterial property and light resistance. In addition, chitosan is an amino polysaccharide, and can fix copper ions in the raw bamboo to prevent the loss of the copper ions.
Disclosure of Invention
The invention provides a treating agent for keeping natural green of bamboo and a using method thereof, aiming at green fading of bamboo green in the storage and use processes of new bamboo. This application adopts chitosan to fix the copper ion in the bamboo timber, under the prerequisite of keeping the bamboo greenish, further improves the colour durability of handling the material, still has antibacterial property simultaneously.
The technical scheme adopted by the invention is as follows:
a green-keeping agent for bamboo wood:
the bamboo green-keeping agent comprises two treating agents, namely a treating agent A and a treating agent B; the treating agent A is mainly compounded by chitosan, copper salt and acid; the treating agent B is mainly compounded by copper salt and ammonia water or organic amine.
The treating agent A comprises the following components in parts by weight:
the chitosan of the treating agent A is the chitosan with the molecular weight of 5000-10 ten thousand and the deacetylation degree of more than 85 percent; the acid of the treating agent A is one or two of acetic acid, hydrochloric acid and propionic acid; the copper salt of the treating agent A is one of copper chloride, copper sulfate and copper acetate.
The treating agent B comprises the following components in parts by weight:
2.5 to 4.5% of a copper salt
4.5-10.5 parts of ammonia water or organic amine
93.0-85.0 parts of water
The organic amine is ethanolamine.
Secondly, a preparation method of the bamboo green-keeping agent comprises the following steps:
treating agent A and treating agent B were prepared separately by the following method:
treating agent A: dissolving chitosan in glacial acetic acid, adding a copper salt aqueous solution under the stirring state, heating the solution to 80 ℃, and continuing stirring until the chitosan and the copper salt form a uniform and transparent solution to prepare a treating agent A;
treating agent B: dispersing or dissolving one or two of copper oxide, copper sulfate, copper chloride, copper acetate, basic copper carbonate and copper hydroxide in water in the weight portion of 100, stirring, adding ammonia water or ethanolamine dropwise, and clarifying to obtain the treating agent B.
Thirdly, a using method of the bamboo green-keeping agent:
putting the fresh cut wood into the treating agent A, and heating for 2 hours in a water bath or an oil bath at the temperature of about 80 ℃; taking out after heating, putting into treating agent B, and water bath or oil bath at 80 deg.C for 30min (the time can be prolonged appropriately); and taking out the bamboo after the treatment is finished.
The bamboo processed by the method is dark green, the surface of the bamboo is covered with a film, the film can be directly removed or removed after being kept for a period of time, and the bamboo after being removed presents obvious luster.
The application adopts a copper salt solution green-keeping technology different from the conventional copper salt solution green-keeping technology and also different from the preparation and application fields of chitosan copper salt, and adopts a two-step method to treat bamboo wood. Firstly, the bamboo is treated by adopting a mixed solution of chitosan and copper salt, and then the bamboo is placed in a cuprammonium solution for further color fixing treatment.
The invention uses chitosan for green keeping of bamboo wood, and the raw materials are environment-friendly, have rich sources and have antibacterial performance. The chitosan and the copper salt are combined to realize the double functions of antibiosis and green protection of the bamboo.
The invention has the beneficial effects that:
the bamboo processed by the method can realize the series of colors from light green to dark green of the green color of the bamboo, and improves the color durability of the processed material.
The processing method is simple and nontoxic, and the processed material has no pungent smell, not only keeps green, but also has obvious luster and certain light resistance.
Drawings
FIG. 1 is a graph showing the results of the color of bamboo treated in example 1.
FIG. 2 is a graph showing the color results of bamboo treated in example 2.
FIG. 3 is a schematic diagram showing the color results of bamboo materials treated with the green-keeping agent of the present invention after being stored indoors for 38 days;
FIG. 4 is a schematic diagram showing the color results of bamboo materials without being treated by the green-keeping agent of the present invention after being stored indoors for 38 days;
FIG. 5 is a graph showing the color results of bamboo materials after 10 days of storage in a film chamber with the surface removed after treatment according to the present invention.
Fig. 6 is a graph showing the results of chromaticity indexes of red and green axes after the embodiments are implemented.
Detailed Description
The present invention will be further described with reference to the following examples, but the examples are not intended to limit the scope of the present invention.
The present invention can be practiced using the following examples, but is not limited to the following examples.
Preparation and treatment process of chitosan copper green-keeping agent
Example 1
Preparation of a green-keeping treatment agent A: weighing 2g of chitosan and 40g of acetic acid solution, and stirring at room temperature for 10 min; weighing 6g of copper sulfate, and dissolving in 102g of water; mixing the two solutions to obtain the chitosan copper (copper sulfate) green-keeping treatment agent A.
Preparation of green-keeping treatment agent B: 5g of copper sulfate is dissolved in 150g of water, and ammonia water is added dropwise under stirring until the solution is clear and transparent, so that the treating agent B is prepared.
The bamboo green-keeping treatment process comprises the following steps: firstly, placing bamboo in a green-keeping agent A, heating for 2h at 80 ℃, taking out, immediately placing the bamboo in a treating agent B, reacting for 0.5h at 80 ℃, taking out, washing unreacted agents and surface floating color with water, and air-drying or kiln-drying to obtain a green-keeping raw bamboo product.
The surface of the bamboo is wiped off with the loose color and the film layer, and the bamboo will have the original green color (shown in figure 1 after the treatment) and can be kept for a long time (shown in figure 3 after 38 days).
Example 2
Preparation of a green-keeping treatment agent A: weighing 0.04kg of chitosan and 0.46kg of acetic acid, and stirring at room temperature for 10 min; weighing 0.2kg of copper chloride, and dissolving in 4.3kg of water; mixing the two solutions, and heating at 80 ℃ to obtain the chitosan copper (copper chloride) green-keeping reagent A.
Preparation of green-keeping treatment agent B: 0.16kg of copper sulfate is dissolved in 6kg of water, and ammonia water is slowly added under stirring until the solution is clear and transparent, thus preparing the treating agent B.
The bamboo green-keeping treatment process comprises the following steps: firstly, placing bamboo in a green-keeping agent A, heating for 2h at 80 ℃, taking out, immediately placing the bamboo in a treating agent B, reacting for 0.5h at 80 ℃, taking out, washing unreacted agents and surface floating color with water, and air-drying or kiln-drying to obtain a green-keeping raw bamboo product.
The surface of the bamboo is wiped off with the loose color and the film layer, and the bamboo will present the original green color (shown in figure 2 after the treatment) and can keep for a long time.
Example 3
Preparation of a green-keeping treatment agent A: weighing 0.05kg of chitosan and 1kg of acetic acid, stirring at room temperature for 10 min: 0.15kg of copper acetate was weighed out and dissolved in 5kg of water: mixing the two solutions, and heating at 80 deg.C to obtain chitosan copper (copper acetate) green-keeping agent A.
Preparation of green-keeping treatment agent B: 0.25kg of copper sulfate is dissolved in 6kg of water, and ammonia water is slowly added under stirring until the solution is clear and transparent, thus preparing the treating agent B.
The bamboo green-keeping treatment process comprises the following steps: firstly, placing bamboo in a green-keeping agent A, heating for 2h at 80 ℃, taking out, immediately placing the bamboo in a treating agent B, reacting for 0.5h at 80 ℃, taking out, washing unreacted agents and surface floating color with water, and air-drying or kiln-drying to obtain a green-keeping raw bamboo product.
The surface of the bamboo is wiped off with the loose color and the film layer, and the bamboo will present the original green color (shown in figure 2 after the treatment) and can keep for a long time.
Green keeping effect of bamboo
The experimental data were measured by a full-automatic colorimeter model DC-P3 (manufactured by Kyoho optical colorimeter Co., Ltd., Beijing). The color expression method is L, a, b, color system method. Storing the bamboo material after green-keeping treatment and the fresh bamboo material without green-keeping treatment in the same environment, keeping the water content equivalent, observing and testing the color change, and testing the results as shown in table 1 and figure 1. The smaller the red-green axis chromaticity index b value is, the more green the color is, otherwise, the green color is faded away.
The fresh bamboo material is dark green, and its colour value is respectively L ═ 41.93 and a*-8.22 and b*15.69. The color values of the bamboo materials after green keeping treatment are respectively 39.32-45.25 and a*(-8.06) - (-11.83) and b*11.21-16.08. The bamboo processed by the method can keep green for a longer time. The green of the bamboo materials which are not treated by the method is basically faded about 10 days indoors, the bamboo materials which are treated by the method still keep dark green after 10 days under the same condition, and the color of the bamboo materials is stabilized between light green and yellow green after 38 days.
Compared with untreated bamboo, the green color of the bamboo obtained by the method can be kept for a long time, and the bamboo has certain light resistance.
TABLE 1
The green color of the bamboo chips completely fades to yellow as shown in fig. 4 is obtained by the experimental test of indoor routine preservation for 38 days.
After the treatment of the invention and the conventional storage for 10 days in a room after removing the surface film layer, the result that the bamboo chips shown in figure 5 are light green is obtained.
As can be seen from the comparison between FIG. 3 and FIG. 4, the bamboo material treated by the present invention can keep green for a longer time. The green of the bamboo materials which are not treated by the method is basically faded about 10 days indoors, the bamboo materials which are treated by the method still keep dark green after 10 days under the same condition, and the color of the bamboo materials is stabilized in light green or yellow green after 38 days.
As can be seen from fig. 5, the bamboo material will show better gloss after the treatment of the present invention and the film on the surface is removed. Due to insufficient shooting conditions, the color of the bamboo material in fig. 5 is slightly yellowish, and the actual sample is light green. And the color chromaticity index of each example is shown in fig. 6.
Claims (7)
1. A green-keeping agent for bamboo wood is characterized in that:
the bamboo green-keeping agent comprises two treating agents, namely a treating agent A and a treating agent B; the treating agent A is mainly compounded by chitosan, copper salt and acid; the treating agent B is mainly compounded by copper salt and ammonia water or organic amine.
2. The bamboo wood green-keeping agent according to claim 1, characterized in that:
the treating agent A comprises the following components in parts by weight:
3. the bamboo green-keeping agent of claim 1, wherein:
the chitosan of the treating agent A is the chitosan with the molecular weight of 5000-10 ten thousand and the deacetylation degree of more than 85 percent; the acid of the treating agent A is one or two of acetic acid, hydrochloric acid and propionic acid; the copper salt of the treating agent A is one of copper chloride, copper sulfate and copper acetate.
4. The bamboo green-keeping agent of claim 1, wherein:
the treating agent B comprises the following components in parts by weight:
2.5 to 4.5% of a copper salt
4.5-10.5 parts of ammonia water or organic amine
93.0 to 85.0 parts of water.
5. The bamboo green-keeping agent of claim 1, wherein:
the organic amine is ethanolamine.
6. A method for preparing a bamboo green-keeping agent as claimed in any one of claims 1-3, characterized in that:
treating agent A and treating agent B were prepared separately by the following method:
treating agent A: dissolving chitosan in glacial acetic acid, adding a copper salt aqueous solution under the stirring state, heating the solution to 80 ℃, and continuing stirring until the chitosan and the copper salt form a uniform and transparent solution to prepare a treating agent A;
treating agent B: dispersing or dissolving one or two of copper oxide, copper sulfate, copper chloride, copper acetate, basic copper carbonate and copper hydroxide in water in the weight portion of 100, stirring, adding ammonia water or ethanolamine dropwise, and clarifying to obtain the treating agent B.
7. The use method of the bamboo green-keeping agent prepared by the method of any one of claims 1 to 3 or the method of claim 4 is characterized in that:
putting the fresh cut wood into the treating agent A, and heating for 2 hours in a water bath or an oil bath at the temperature of about 80 ℃; taking out after heating, putting into treating agent B, and water bath or oil bath at 80 deg.C for 30min (the time can be prolonged appropriately); and taking out the bamboo after the treatment is finished.
The bamboo processed by the method is dark green, the surface of the bamboo is covered with a film, the film can be directly removed or removed after being kept for a period of time, and the bamboo after being removed presents obvious luster.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112476685A (en) * | 2020-11-25 | 2021-03-12 | 四川农业大学 | Surface-protected bamboo product, surface protection method thereof and protective agent thereof |
| CN115179380A (en) * | 2022-07-15 | 2022-10-14 | 浙江农林大学 | Preparation method of emerald green mildew-resistant anti-cracking round bamboo |
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| CN109049199A (en) * | 2018-09-19 | 2018-12-21 | 谢九龙 | bamboo processing method |
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| JPH08132408A (en) * | 1994-11-04 | 1996-05-28 | Satoshi Matsumura | Method for preventing fading and regenerating chloroplast in vegetable body |
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| CN105619555A (en) * | 2014-10-27 | 2016-06-01 | 东北林业大学 | Novel method for improving light resistance of dyed wood veneer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112476685A (en) * | 2020-11-25 | 2021-03-12 | 四川农业大学 | Surface-protected bamboo product, surface protection method thereof and protective agent thereof |
| CN115179380A (en) * | 2022-07-15 | 2022-10-14 | 浙江农林大学 | Preparation method of emerald green mildew-resistant anti-cracking round bamboo |
| CN115179380B (en) * | 2022-07-15 | 2023-09-12 | 浙江农林大学 | Preparation method of emerald green mildew-resistant and crack-resistant round bamboo |
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