CN114986638B - Preparation method of green mildew-proof bamboo wood for food contact - Google Patents
Preparation method of green mildew-proof bamboo wood for food contact Download PDFInfo
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- CN114986638B CN114986638B CN202210666755.XA CN202210666755A CN114986638B CN 114986638 B CN114986638 B CN 114986638B CN 202210666755 A CN202210666755 A CN 202210666755A CN 114986638 B CN114986638 B CN 114986638B
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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
- B27K9/00—Chemical or physical treatment of reed, straw, or similar material
- B27K9/002—Cane, bamboo
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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
- B27K3/12—Impregnating by coating the surface of the wood with an impregnating paste
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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
- B27K3/20—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
- B27K3/34—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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
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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
- 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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- 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
-
- 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
- B27K2240/70—Hydrophobation treatment
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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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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention provides a preparation method of green mildew-proof bamboo wood for food contact, which comprises the following steps: and (3) drying the bamboo, carrying out salt fog gasification adsorption treatment on the preheated bamboo to be treated by using a salt solution, drying the bamboo subjected to salt fog treatment to a water content of 20-30% under the condition of superheated steam at 110-130 ℃, then carrying out microwave drying to a water content of 10-15% to obtain the dried bamboo subjected to salt fog treatment, and carrying out deep penetration and drying treatment on a coating layer after coating by using a surface water repellent prepared from wax, turpentine and semi-dry vegetable oil to obtain the green mildew-proof bamboo for food contact. The invention is not limited by the shape of the sample, is suitable for mildew protection treatment of bamboo product base materials or finished products, and increases the hardness and hydrophobicity of the bamboo surface. The treatment process has no wastewater discharge, and has the advantages of environment friendliness, safety, low carbon, environment friendliness, simplicity in operation and the like.
Description
Technical Field
The invention belongs to the technical field of bamboo corrosion prevention, and particularly relates to a preparation method of green mildew-proof bamboo for food contact.
Background
In recent years, bamboo products have been rapidly developed, especially bamboo tableware such as toothpicks, chopsticks, aviation disposable fork and spoon cutlery boxes, etc., and bamboo packaging materials or bamboo containers contacting with food such as bamboo tea cans, bamboo packaging boxes, bamboo tube beverage cans, etc. The original bamboo product has natural and elegant texture, high strength and toughness, is extremely easy to generate mildew, causes the change of surface color and smell, and seriously affects the service performance. The bamboo engineering material is generally treated by chemical mildew resistance, has certain biotoxicity and is easy to run off in the use process. There is a strong need for dedicated mildew-proof technology for food contact.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a preparation method of green mildew-proof bamboo for food contact, which is not limited by the shape of a sample, has good mildew-proof effect, enhances the surface hardness, pollution resistance and hydrophobicity of a material, is environment-friendly and safe, and is particularly suitable for mildew-proof treatment of raw bamboo packaging materials for food contact.
In order to solve the technical problems, the invention adopts the following technical scheme: a preparation method of green mildew-proof bamboo for food contact comprises the following steps:
s1, drying the bamboo material, namely drying the bamboo material at the temperature of 60-100 ℃ to obtain the bamboo material to be treated;
s2, salt mist gasification adsorption: boiling distilled water, cooling to 35-50 ℃ to obtain treated distilled water, and dissolving sodium salt or potassium salt in the treated distilled water to obtain a salt solution; preheating the bamboo to be treated obtained in the step S1 to 65-100 ℃, and carrying out salt fog gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 35-50 ℃ for 1-3 h to obtain bamboo after salt fog treatment; the redundant salt is recovered, crystallized and purified and then used continuously;
the invention uses the mode of salt fog gasification adsorption to carry out mildew-proof treatment on the bamboo wood, can play a role in sample sterilization, and the salt fog treatment can leach out little the extraction components in the bamboo wood, so that the separated salt is easy to recycle, is not limited by the shape of the sample, and can directly treat the finished product. The strength of salt fog treatment is increased along with the temperature, the salt fog erosion (penetration) effect is multiplied, and the treatment efficiency is obviously improved; and the redundant salt can be continuously recovered, crystallized and purified for use, and no other waste liquid is discharged;
s3, drying the bamboo subjected to salt fog treatment obtained in the step S2 under the condition of superheated steam at 110-130 ℃ until the water content is 20-30%, and then performing microwave drying until the water content is 10-15%, so as to obtain salt fog treatment dried bamboo;
in the process of drying by using superheated steam, the surface temperature of the bamboo is high, the wettability is good, the salt precipitation can be reduced, in addition, the influence of the oxidation process of the bamboo is reduced due to the small oxygen content, the original color of the bamboo is kept as much as possible, and the bacteria, spores and the like possibly existing in the bamboo can be thoroughly cleaned;
s4, surface hydrophobic treatment: and (3) after the surface treatment of the salt fog treated dry bamboo wood obtained in the step (S3) is smooth, and surface impurities (impurities such as dust and salts on the surface) are purged by adopting a high-pressure air gun, dissolving wax in turpentine at the temperature of 50-80 ℃ to obtain a wax turpentine mixture, mixing the wax turpentine mixture with semi-dry vegetable oil to obtain a surface hydrophobizing agent, brushing the surface of the salt fog treated dry bamboo wood, and carrying out coating layer deep penetration and drying treatment in a baking oven at the temperature of 100-135 ℃ to obtain the green mildew-proof bamboo wood for food contact.
Turpentine is a natural organic solvent, has strong solubility to oil wax, low boiling point, difficult residue and strong permeability, is a good carrier required by the invention, and can bring wax into the inside of bamboo tissues to achieve deep penetration. The wax and the semi-drying oil selected by the invention are edible, simulate the baking process of the edible material after being coated with oil, adopt surface coating and combine with heating deep penetration, save the cost and realize the mildew-proof treatment of the material in a green mode.
The invention carries out surface coating layer drying treatment in a baking oven with the temperature of 100-135 ℃, the flow of the oil wax layer is increased at high temperature, the resin brings the oil wax into bamboo thin-wall cells and ducts in the infiltration process, and the oil wax is solidified in the bamboo cell tissues along with the volatilization of the resin and the reduction of the environmental temperature, thereby achieving the effects of surface filling hardening and hydrophobicity, and simultaneously wrapping and covering salt fog components, reducing the loss of the salt fog components and achieving the slow release effect.
Surface hydrophobic treatment: and (3) after the surface treatment of the salt fog treated dry bamboo wood obtained in the step (S3) is smooth, and surface sundries are purged by adopting a high-pressure air gun, wax is dissolved in turpentine at the temperature of 50-80 ℃ to obtain a wax turpentine mixture, the wax turpentine mixture is mixed with semi-dry vegetable oil to obtain a surface hydrophobing agent, and after the surface of the salt fog treated dry bamboo wood is coated, the coating layer deep penetration and drying treatment are carried out in a baking oven at the temperature of 100-135 ℃ to obtain the green mildew-proof bamboo wood for food contact.
Preferably, the water content of the bamboo to be treated in the S1 is 8% -10%.
Preferably, the mass fraction of the sodium salt or the potassium salt in the salt solution in S2 is 20-30%.
Preferably, the sodium salt in S2 comprises sodium chloride, sodium nitrate or sodium carbonate; the potassium salt includes potassium chloride.
Preferably, the wax turpentine mixture in S4 has a mass fraction of wax of 40% to 60%.
Preferably, the mass ratio of the wax turpentine mixture to the semi-dry vegetable oil in the surface hydrophobe in S4 is 1: (3-5).
Preferably, the semi-dry vegetable oil in S4 comprises linseed oil, sunflower oil, soybean oil or castor oil.
Preferably, the wax in S4 comprises palm wax, beeswax or candelilla wax.
Preferably, the time in the baking oven in the step S4 is 0.5-2 h.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the bamboo is sterilized by using a salt fog gasification adsorption mode, the extracted components in the bamboo are seldom leached out by the salt fog treatment, the separated salt is easy to recycle, the salt is not limited by the shape of a sample, and a finished product can be directly treated. The salt fog treatment is multiplied along with the temperature, the erosion effect is multiplied, and the treatment efficiency is high; the redundant salt can be continuously recovered, crystallized and purified for use, surface salt fog treatment is adopted instead of liquid impregnation, the extraction components of the bamboo are rarely discharged, and no waste liquid is discharged; the method has the advantages that the method adopts superheated steam for drying in the later period, the surface temperature of the bamboo is high, the wettability is good, the salt precipitation can be reduced, in addition, the influence of the oxidation process of the bamboo is reduced due to the low oxygen content, the original color of the bamboo is kept as much as possible, and the method can play a relatively thorough bactericidal role on fungus, spores and the like possibly existing in the bamboo.
2. The bamboo wood is subjected to salt spray gasification adsorption, grease/wax wrapping and high-temperature baking deep penetration, the inside forms a high-salt component environment, the normal physiological metabolism of mould is not facilitated, the surface layer forms a hydrophobic layer, and the bamboo wood or products thereof are subjected to mould forming to play a double protection role. The method has the advantages of simple process, no toxicity, no harm, no emission, no limitation of the shape of the sample (both finished products and raw materials), enhanced surface hardness, pollution resistance, hydrophobicity, good mildew protection effect and the like, and is particularly suitable for mildew-proof treatment of raw bamboo packaging materials for food contact.
The present invention will be described in further detail with reference to examples.
Detailed Description
Example 1
The preparation method of the green mildew-proof bamboo material for food contact of the embodiment is that the green mildew-proof bamboo material for food contact of the embodiment is a disposable fork for aviation, and the method comprises the following steps:
s1, drying bamboo materials (raw bamboo fork) at the temperature of 60 ℃ to obtain bamboo materials to be treated, wherein the water content of the bamboo materials is 10%;
s2, salt mist gasification adsorption: boiling distilled water, cooling to 35 ℃ to obtain treated distilled water, and dissolving sodium salt (sodium chloride) in the treated distilled water to obtain a salt solution; preheating the bamboo to be treated obtained in the step S1 to 65 ℃, and carrying out salt fog gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 35 ℃ for 3 hours to obtain bamboo after salt fog treatment; the redundant salt is recovered, crystallized and purified and then used continuously; the mass fraction of sodium salt in the salt solution is 30%;
s3, drying the bamboo subjected to salt fog treatment obtained in the S2 under the condition of superheated steam at 130 ℃ until the water content is 20%, and then performing microwave drying until the water content is 10%, so as to obtain salt fog treated and dried bamboo;
s4, surface hydrophobic treatment: after the surface treatment of the salt fog treated dry bamboo wood obtained in the step S3 is smooth, and surface sundries are purged by adopting a high-pressure air gun, wax (beeswax) is dissolved in turpentine at the temperature of 50 ℃ to obtain a wax turpentine mixture, the wax turpentine mixture is mixed with semi-dry vegetable oil (soybean oil) to obtain a surface hydrophobing agent, after the surface of the salt fog treated dry bamboo wood is coated, the surface heat treatment is carried out for 0.5h in a baking oven at the temperature of 135 ℃, and the green mildew-proof bamboo wood for food contact, namely, the disposable aviation fork and spoon is obtained; the mass fraction of wax in the wax turpentine mixture is 40%; the mass ratio of the wax turpentine mixture to the semi-dry vegetable oil in the surface hydrophobizing agent is 1:3.
performance test results of disposable aviation fork prepared in this example:
mildew resistance: mould tests are carried out according to Aspergillus niger (mould) and Theobroma cacao (color-changing bacteria) specified in national standard GB/T18261-2013 test method for preventing and controlling wood mould and blue-turning bacteria by mould inhibitor.
The control efficiency of the color-changing bacteria is 80 percent, and the control efficiency of the mold is 67 percent;
surface wettability (contact angle): 95 °;
surface hardness (GB/T1941-2009): the gold hardness was 4520N.
In this embodiment, the raw bamboo fork in step S1 is used as a control, and the performance test results are:
mildew resistance: the control efficiency of the color-changing bacteria is 17 percent, and the control efficiency of the mold is 0 percent;
surface wettability (contact angle): 82 °;
surface hardness (GB/T1941-2009): the gold hardness was 3869N.
Example 2
The preparation method of the green mildew-proof bamboo wood (green mildew-proof bamboo tea caddy) for food contact in the embodiment comprises the following steps:
s1, drying bamboo wood (bamboo tea cans) at the temperature of 100 ℃ to obtain bamboo wood to be treated with the water content of 8%;
s2, salt mist gasification adsorption: boiling distilled water, cooling to 50 ℃ to obtain treated distilled water, and dissolving sodium salt (sodium nitrate) in the treated distilled water to obtain a salt solution; preheating the bamboo to be treated obtained in the step S1 to 100 ℃, and carrying out salt fog gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 50 ℃ for 1h to obtain bamboo after salt fog treatment; the redundant salt is recovered, crystallized and purified and then used continuously; the mass fraction of sodium salt in the salt solution is 20%;
s3, drying the salt mist treated bamboo wood obtained in the S2 to 30% of water content under the condition of superheated steam at 110 ℃, and then carrying out microwave drying to 15% of water content to obtain salt mist treated dried bamboo wood;
s4, surface hydrophobic treatment: after the surface treatment of the salt fog treated dry bamboo wood obtained in the step S3 is smooth, and surface sundries are purged by adopting a high-pressure air gun, wax (palm wax) is dissolved in turpentine at the temperature of 80 ℃ to obtain a wax turpentine mixture, the wax turpentine mixture is mixed with semi-dry vegetable oil (sunflower seed oil) to obtain a surface hydrophobing agent, after the surface of the salt fog treated dry bamboo wood is coated, the coating layer deep penetration and the drying treatment are carried out in a baking oven at the temperature of 100 ℃ for 2 hours, and the green mildew-proof bamboo wood for food contact, namely the green mildew-proof bamboo tea caddy, is obtained; the mass fraction of wax in the wax turpentine mixture is 60%; the mass ratio of the wax turpentine mixture to the semi-dry vegetable oil in the surface hydrophobizing agent is 1:5.
the performance test result of the green mildew-proof bamboo tea caddy prepared by the embodiment:
mildew resistance: mould tests are carried out according to Aspergillus niger (mould) and Theobroma cacao (color-changing bacteria) specified in national standard GB/T18261-2013 test method for preventing and controlling wood mould and blue-turning bacteria by mould inhibitor.
The control efficiency of the color-changing bacteria is 75 percent, and the control efficiency of the mold is 75 percent;
surface wettability (contact angle): 96 °;
surface hardness (GB/T1941-2009): the gold hardness was 5030N.
In this embodiment, the bamboo tea caddy in step S1 is used as a control, and the performance test results are as follows:
mildew resistance: the control efficiency of the color-changing bacteria is 15 percent, and the control efficiency of the mold is 0 percent;
surface wettability (contact angle): 85 °;
surface hardness (GB/T1941-2009): the gold hardness was 4280N.
Example 3
The preparation method of the green mildew-proof bamboo wood (green mildew-proof bamboo basket) for food contact in the embodiment comprises the following steps:
s1, drying bamboo materials, namely drying the bamboo materials (bamboo basket) at the temperature of 85 ℃ to obtain the bamboo materials to be treated, wherein the water content of the bamboo materials is 8%;
s2, salt mist gasification adsorption: boiling distilled water, cooling to 40 ℃ to obtain treated distilled water, and dissolving potassium salt (potassium chloride) in the treated distilled water to obtain a salt solution; preheating the bamboo to be treated obtained in the step S1 to 80 ℃, and carrying out salt fog gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 40 ℃ for 2 hours to obtain bamboo after salt fog treatment; the redundant salt is recovered, crystallized and purified and then used continuously; the mass fraction of potassium salt in the salt solution is 25%;
s3, drying the bamboo subjected to salt fog treatment obtained in the step S2 under the condition of superheated steam at 120 ℃ until the water content is 25%, and then performing microwave drying until the water content is 10% -15%, so as to obtain salt fog treated dried bamboo;
s4, surface hydrophobic treatment: after the surface treatment of the salt fog treated dry bamboo wood obtained in the step S3 is smooth, and surface sundries are purged by adopting a high-pressure air gun, wax (candelilla wax) is dissolved in turpentine at the temperature of 60 ℃ to obtain a wax turpentine mixture, the wax turpentine mixture is mixed with semi-dry vegetable oil (linseed oil) to obtain a surface hydrophobing agent, after the surface of the salt fog treated dry bamboo wood is coated, the coating layer deep penetration and the drying treatment are carried out in a baking oven at the temperature of 120 ℃ for 1.5 hours, and the green mildew-proof bamboo wood for food contact, namely a green mildew-proof bamboo basket, is obtained; the mass fraction of wax in the wax turpentine mixture is 50%; the mass ratio of the wax turpentine mixture to the semi-dry vegetable oil in the surface hydrophobizing agent is 1:4.
the performance test result of the green mildew-proof bamboo weaving basket prepared in the embodiment:
mildew resistance: mould tests are carried out according to Aspergillus niger (mould) and Theobroma cacao (color-changing bacteria) specified in national standard GB/T18261-2013 test method for preventing and controlling wood mould and blue-turning bacteria by mould inhibitor.
The control efficiency of the color-changing bacteria was 75%, and the control efficiency of the mold was 75%.
In this embodiment, the bamboo basket in step S1 is used as a control, and the performance test results are:
mildew resistance: the control efficacy of the color-changing bacteria was 17% and the control efficacy of the mold was 0%.
Example 4
The preparation method of the green mildew-proof bamboo wood (green mildew-proof bamboo chopping board) for food contact in the embodiment comprises the following steps:
s1, drying bamboo materials, namely drying the bamboo materials (bamboo chopping boards) at the temperature of 75 ℃ to obtain bamboo materials to be treated, wherein the water content of the bamboo materials is 9%;
s2, salt mist gasification adsorption: boiling distilled water, cooling to 45 ℃ to obtain treated distilled water, and dissolving potassium salt (potassium chloride) in the treated distilled water to obtain a salt solution; preheating the bamboo to be treated obtained in the step S1 to 70 ℃, and carrying out salt fog gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 45 ℃ for 2 hours to obtain bamboo after salt fog treatment; the redundant salt is recovered, crystallized and purified and then used continuously; the mass fraction of the potassium salt in the salt solution is 20%;
s3, drying the salt mist treated bamboo wood obtained in the S2 under the condition of the superheated steam at the temperature of 125 ℃ until the water content is 27%, and then carrying out microwave drying until the water content is 13%, so as to obtain salt mist treated dried bamboo wood;
s4, surface hydrophobic treatment: after the surface treatment of the salt fog treated dry bamboo wood obtained in the step S3 is smooth, and surface sundries are purged by adopting a high-pressure air gun, wax (palm wax) is dissolved in turpentine at the temperature of 70 ℃ to obtain a wax turpentine mixture, the wax turpentine mixture is mixed with semi-dry vegetable oil (castor oil) to obtain a surface hydrophobing agent, after the surface of the salt fog treated dry bamboo wood is coated, the surface treatment is carried out in a baking oven at the temperature of 130 ℃ for 1h, and the green mildew-proof bamboo wood for food contact, namely a green mildew-proof bamboo chopping board, is obtained; the mass fraction of wax in the wax turpentine mixture is 45%; the mass ratio of the wax turpentine mixture to the semi-dry vegetable oil in the surface hydrophobizing agent is 1:3.
the performance test result of the green mildew-proof bamboo chopping block prepared in the embodiment:
mildew resistance: mould tests are carried out according to Aspergillus niger (mould) and Theobroma cacao (color-changing bacteria) specified in national standard GB/T18261-2013 test method for preventing and controlling wood mould and blue-turning bacteria by mould inhibitor.
The control efficiency of the color-changing bacteria is 85 percent, and the control efficiency of the mold is 67 percent;
surface wettability (contact angle): 105 °;
surface hardness (GB/T1941-2009): the gold hardness was 5210N.
In this example, the bamboo chopping board in step S1 serves as a control, and the performance test results:
mildew resistance: the control efficiency of the color-changing bacteria is 17 percent, and the control efficiency of the mold is 0 percent;
surface wettability (contact angle): 85 °;
surface hardness (GB/T1941-2009): the gold hardness was 3980N.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (2)
1. The preparation method of the green mildew-proof bamboo wood for food contact is characterized by comprising the following steps of:
s1, drying the bamboo material, namely drying the bamboo material at the temperature of 60-100 ℃ to obtain the bamboo material to be treated;
s2, salt mist gasification adsorption: boiling distilled water, cooling to 35-50 ℃ to obtain treated distilled water, and dissolving sodium salt or potassium salt in the treated distilled water to obtain a salt solution; preheating the bamboo to be treated obtained in the step S1 to 65-100 ℃, and carrying out salt fog gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 35-50 ℃ for 1-3 h to obtain bamboo after salt fog treatment;
the mass fraction of sodium salt or potassium salt in the salt solution in S2 is 20% -30%;
the sodium salt in S2 comprises sodium chloride, sodium nitrate or sodium carbonate; the potassium salt comprises potassium chloride;
s3, drying the bamboo subjected to salt fog treatment obtained in the step S2 under the condition of superheated steam at 110-130 ℃ until the water content is 20-30%, and then performing microwave drying until the water content is 10-15%, so as to obtain salt fog treatment dried bamboo;
s4, surface hydrophobic treatment: after the surface treatment of the salt fog treatment dried bamboo material obtained in the step S3 is smooth, and surface sundries are purged by adopting a high-pressure air gun, wax is dissolved in turpentine at the temperature of 50-80 ℃ to obtain a wax turpentine mixture, the wax turpentine mixture is mixed with semi-dry vegetable oil to obtain a surface hydrophobing agent, after the surface of the salt fog treatment dried bamboo material is coated, the coating layer deep penetration and drying treatment are carried out in a baking oven at the temperature of 100-135 ℃ to obtain green mildew-proof bamboo material for food contact;
the mass fraction of wax in the wax turpentine mixture in S4 is 40% -60%;
the mass ratio of the wax turpentine mixture to the semi-dry vegetable oil in the surface hydrophobe in the S4 is 1: (3-5);
s4, the semi-dry vegetable oil is linseed oil, sunflower seed oil, soybean oil or castor oil;
the wax in S4 comprises palm wax, beeswax or candelilla wax;
and S4, the time in the baking oven is 0.5-2 h.
2. The method for producing a green mold-proof bamboo material for food contact according to claim 1, wherein the water content of the bamboo material to be treated in S1 is 8% to 10%.
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