CN114986638A - 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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- CN114986638A CN114986638A CN202210666755.XA CN202210666755A CN114986638A CN 114986638 A CN114986638 A CN 114986638A CN 202210666755 A CN202210666755 A CN 202210666755A CN 114986638 A CN114986638 A CN 114986638A
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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
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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
- 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
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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
- B27K2240/70—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
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Abstract
The invention provides a preparation method of green mildew-proof bamboo wood for food contact, which comprises the following steps: after drying the bamboo, carrying out salt spray gasification adsorption treatment on the preheated bamboo to be treated by using a salt solution, drying the bamboo subjected to salt spray treatment under the condition of superheated steam at the temperature of 110-130 ℃ until the water content is 20-30%, then carrying out microwave drying until the water content is 10-15% to obtain the salt spray treated dried bamboo, coating the salt spray treated dried bamboo by using a surface hydrophobing agent prepared from wax, turpentine and semi-dry vegetable oil, and then carrying out deep penetration and drying treatment on a coating layer to obtain the green mildew-proof bamboo for food contact. The method is not limited by the shape of the sample, is suitable for the mildew protection treatment of the bamboo product base material or the finished product, and simultaneously increases the surface hardness and the hydrophobicity of the bamboo. The treatment process has no wastewater discharge, and has the advantages of green safety, low carbon, environmental protection, simple 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, the development of raw bamboo products is rapid, and especially bamboo tableware, such as toothpicks, chopsticks, aviation disposable spoons and lunch boxes, and bamboo packaging materials or bamboo containers contacting with food, such as bamboo tea cans, bamboo packaging boxes, bamboo tube beverage cans, and the like, are rapidly developed. The raw bamboo product has natural and elegant texture, high strength and toughness, but is easy to mildew, so that the surface color and smell are changed, and the use performance is seriously influenced. The bamboo engineering material is generally subjected to chemical mildew-proof treatment, has certain biological toxicity and is easy to lose in the using process. There is an urgent need for special anti-mold techniques for food contact.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of green mildew-proof bamboo material for food contact, aiming at the defects of the prior art, the method is not limited by the shape of a sample, has good mildew protection effect, enhances the surface hardness, stain resistance and hydrophobicity of the material, is environment-friendly and safe in treatment method, and is particularly suitable for mildew-proof treatment of the food contact original bamboo packaging material.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of green mildew-proof bamboo wood for food contact comprises the following steps:
s1, drying the bamboo wood, namely drying the bamboo wood at the temperature of 60-100 ℃ to obtain the bamboo wood to be treated;
s2, salt spray gasification and 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 wood to be treated obtained in the step S1 to 65-100 ℃, and performing salt mist gasification adsorption treatment on the bamboo wood to be treated by using the salt solution with the temperature of 35-50 ℃ for 1-3 h to obtain the bamboo wood after the salt mist treatment; recovering redundant salt, crystallizing and purifying for continuous use;
the invention uses the salt spray gasification adsorption mode to carry out mildew-proof treatment on the bamboo wood, and can play a role in sample sterilization, the salt spray treatment rarely leaches the extracted components in the bamboo wood, the separated salt is easy to recycle, is not limited by the shape of the sample, and can directly treat the finished product. The salt mist treatment strength is increased along with the temperature, the salt mist erosion (permeation) effect is doubled, and the treatment efficiency is obviously improved; the redundant salt can be continuously recycled, crystallized and purified for use, and no other waste liquid is discharged;
s3, drying the bamboo material subjected to the salt fog treatment obtained in the step S2 under the condition of superheated steam at the temperature of 110-130 ℃ until the water content is 20% -30%, and then performing microwave drying until the water content is 10% -15% to obtain salt fog treated and dried bamboo material;
in the process of drying by using superheated steam, the surface temperature of the bamboo is high, the wettability is good, salt precipitation can be reduced, in addition, the influence of the oxidation process of the bamboo is reduced due to low oxygen content, the original color of the bamboo is kept as far as possible, and the more thorough cleaning and killing effect on fungi, spores and the like possibly existing in the bamboo can be realized;
s4, surface hydrophobic treatment: and (2) flattening the surface of the salt mist treated dry bamboo material obtained in the step (S3), blowing surface impurities (such as dust and salts on the surface) by using 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 hydrophobing agent, coating the surface of the salt mist treated dry bamboo material, and deeply penetrating and drying a coating layer in a baking oven at the temperature of 100-135 ℃ to obtain the green mildew-proof bamboo material for food contact.
Turpentine is a natural organic solvent, has strong dissolvability to wax, low boiling point, difficult residue and strong permeability, is a good carrier required by the invention, and can bring wax into bamboo tissues to achieve deep penetration. The wax and the semi-dry oil selected by the invention are both edible, the baking process after the oil coating of the food material is simulated, the surface coating is adopted, the heating deep penetration is combined, the cost is saved, and the mildew-proof treatment of the material is realized in a green mode.
The surface coating layer is dried in a baking oven at the temperature of 100-135 ℃, the fluidity of the oil wax layer is increased at high temperature, the resin brings the oil wax into bamboo wood thin-wall cells and a conduit in the permeation process, and the oil wax is solidified in bamboo wood cell tissues along with the volatilization of the resin and the reduction of the ambient temperature, so that the surface filling hardening and the hydrophobic effect are achieved, meanwhile, salt mist components are wrapped and covered, the loss of the salt mist components is reduced, and the slow release effect is achieved.
Surface hydrophobic treatment: and (2) flattening the surface of the salt mist treated dry bamboo material obtained in the step (S3), blowing surface sundries by using 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, coating the surface of the salt mist treated dry bamboo material, and performing deep penetration and drying treatment on a coating layer in a baking oven at the temperature of 100-135 ℃ to obtain the green mildew-proof bamboo material 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 includes sodium chloride, sodium nitrate or sodium carbonate; the potassium salt includes potassium chloride.
Preferably, the mass fraction of the wax in the wax pine butter mixture in S4 is 40% to 60%.
Preferably, the mass ratio of the turpentine mixture to the semi-dry vegetable oil in the surface hydrophobizing agent in S4 is 1: (3-5).
Preferably, the semi-dry vegetable oil in S4 includes linseed oil, sunflower seed oil, soybean oil, or castor oil.
Preferably, the wax in S4 comprises carnauba wax, beeswax, or candelilla wax.
Preferably, the time in the oven in S4 is 0.5h to 2 h.
Compared with the prior art, the invention has the following advantages:
1. the invention uses the salt spray gasification adsorption mode to sterilize the bamboo wood, the salt spray treatment rarely leaches the extracted components in the bamboo wood, the separated salt is easy to recycle, is not limited by the shape of a sample, and can directly treat a finished product. The salt spray treatment has the advantages that the corrosion effect is multiplied along with the temperature, and the treatment efficiency is high; the redundant salt can be continuously recovered, crystallized and purified for use, surface salt spray treatment is adopted instead of liquid immersion, few bamboo extraction components are discharged, and no waste liquid is discharged; the superheated steam is used for drying in the later period, the surface temperature of the bamboo wood is high, the wettability is good, salt precipitation can be reduced, in addition, the influence of the oxidation process of the bamboo wood is reduced due to the low oxygen content, the original color of the bamboo wood is kept as far as possible, and the more thorough sterilization effect on fungi, spores and the like possibly existing in the bamboo wood can be realized.
2. This application carries out salt fog gasification absorption, grease wax parcel and high temperature baking degree of depth infiltration to the bamboo timber, and the high salt component environment of inside formation is unfavorable for the normal physiology metabolism of mould, and the hydrophobic layer is formed on the top layer, mildenes and rot to bamboo timber or its product and take place to play the dual protection effect. The method has the advantages of simple process, no toxicity, no harm, no discharge, no limitation on the shape of a 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 prevention treatment of food contact raw bamboo packaging materials.
The present invention will be described in further detail with reference to examples.
Detailed Description
Example 1
The preparation method of the green mildewproof bamboo material for food contact in the embodiment is that the green mildewproof bamboo material for food contact in the embodiment is a disposable fork for aviation, and the method comprises the following steps:
s1, drying the bamboo, namely drying the bamboo (original bamboo fork) at the temperature of 60 ℃ to obtain the bamboo to be treated with the water content of 10%;
s2, salt spray gasification and adsorption: boiling distilled water, cooling to 35 deg.C to obtain treated distilled water, and dissolving sodium salt (sodium chloride) in the treated distilled water to obtain salt solution; preheating the bamboo to be treated obtained in the step S1 to 65 ℃, and performing salt mist gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 35 ℃ for 3 hours to obtain the bamboo subjected to salt mist treatment; recovering redundant salt, crystallizing and purifying for continuous use; the mass fraction of sodium salt in the salt solution is 30%;
s3, drying the bamboo subjected to salt spray treatment obtained in the step S2 under the condition of superheated steam at the temperature of 130 ℃ until the water content is 20%, and then performing microwave drying until the water content is 10% to obtain salt spray treated and dried bamboo;
s4, surface hydrophobic treatment: leveling the surface of the salt mist treated dry bamboo material obtained in the S3, blowing surface impurities by a high-pressure air gun, dissolving wax (beeswax) in turpentine at the temperature of 50 ℃ to obtain a wax turpentine mixture, mixing the wax turpentine mixture with semi-dry vegetable oil (soybean oil) to obtain a surface hydrophobizing agent, coating the surface of the salt mist treated dry bamboo material, and performing surface heat treatment in a baking oven at the temperature of 135 ℃ for 0.5h to obtain green mildew-proof bamboo material for food contact, namely the disposable fork spoon for aviation; the mass fraction of wax in the wax pine butter mixture is 40%; the mass ratio of the turquoise oil mixture to the semi-dry vegetable oil in the surface hydrophobing agent is 1: 3.
the performance test results of the disposable aviation fork prepared in this example are as follows:
mildew resistance: the mildew test is carried out according to Aspergillus niger (mould) and Cocospora cacao (discolor bacteria) specified in the national standard GB/T18261-2013 test method for preventing and controlling wood mould and blue-changing bacteria.
The control efficiency of the chromobacterium is 80 percent, and the control efficiency of the mould is 67 percent;
surface wettability (contact angle): 95 degrees;
surface hardness (GB/T1941-: the King hardness is 4520N.
In this embodiment, the raw bamboo fork in the step S1 is used as a control, and the performance test results are as follows:
mildew resistance: the prevention and treatment efficiency of the discoloring bacteria is 17 percent, and the prevention and treatment efficiency of the mold is 0 percent;
surface wettability (contact angle): 82 degrees;
surface hardness (GB/T1941-: the King hardness was 3869N.
Example 2
The preparation method of the green mildew-proof bamboo wood for food contact (green mildew-proof bamboo tea caddy) in the embodiment comprises the following steps:
s1, drying the bamboo, namely drying the bamboo (the bamboo tea can) at the temperature of 100 ℃ to obtain the bamboo to be treated with the moisture content of 8%;
s2, salt spray gasification and 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 performing salt mist gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 50 ℃ for 1h to obtain the bamboo after the salt mist treatment; recovering redundant salt, crystallizing and purifying for continuous use; the mass fraction of sodium salt in the salt solution is 20%;
s3, drying the bamboo subjected to salt spray treatment obtained in the step S2 under the condition of superheated steam at the temperature of 110 ℃ until the water content is 30%, and then performing microwave drying until the water content is 15% to obtain salt spray treated and dried bamboo;
s4, surface hydrophobic treatment: leveling the surface of the salt mist treated dry bamboo material obtained in the S3, blowing surface impurities by a high-pressure air gun, dissolving wax (palm wax) in turpentine oil at the temperature of 80 ℃ to obtain a wax turpentine oil mixture, mixing the wax turpentine oil mixture with semi-dry vegetable oil (sunflower seed oil) to obtain a surface hydrophobizing agent, coating the surface of the salt mist treated dry bamboo material, and performing coating layer deep penetration and drying treatment in a baking oven at the temperature of 100 ℃ for 2 hours to obtain green mildew-proof bamboo material for food contact, namely a green mildew-proof bamboo tea can; the mass fraction of wax in the wax pine butter mixture is 60 percent; the mass ratio of the mixture of the turpentine and the semi-dry vegetable oil in the surface hydrophobizing agent is 1: 5.
the green mould proof bamboo tea caddy's of this embodiment preparation performance test result:
mildew resistance: the mildew test is carried out according to Aspergillus niger (mould) and Coccomys theobromae (discolor bacteria) specified in the national standard GB/T18261-2013 test method for preventing and controlling wood mould and cyanobacteria by mildew agent.
The control efficiency of the discoloring bacteria is 75 percent, and the control efficiency of the mold is 75 percent;
surface wettability (contact angle): 96 degrees;
surface hardness (GB/T1941-2009): the King hardness was 5030N.
In this embodiment, the bamboo tea caddy in the step S1 is used as a control, and the performance test results are as follows:
mildew resistance: the control efficiency of the discoloring bacteria is 15 percent, and the control efficiency of the mold is 0 percent;
surface wettability (contact angle): 85 degrees;
surface hardness (GB/T1941-: the King hardness was 4280N.
Example 3
The preparation method of the green mildew-proof bamboo wood (green mildew-proof bamboo weaving fruit basket) for food contact in the embodiment comprises the following steps:
s1, drying the bamboo, namely drying the bamboo (bamboo weaving fruit basket) at the temperature of 85 ℃ to obtain the bamboo to be treated with the water content of 8%;
s2, salt spray gasification and 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 performing salt mist gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 40 ℃ for 2 hours to obtain the bamboo subjected to salt mist treatment; the redundant salt is recovered, crystallized and purified and then is continuously used; 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 the temperature of 120 ℃ until the water content is 25%, and then performing microwave drying until the water content is 10% -15% to obtain salt fog treated and dried bamboo;
s4, surface hydrophobic treatment: leveling the surface of the salt mist treated dry bamboo material obtained in the S3, blowing surface impurities by a high-pressure air gun, dissolving wax (candelilla wax) in turpentine oil at the temperature of 60 ℃ to obtain a wax turpentine oil mixture, mixing the wax turpentine oil mixture with semi-dry vegetable oil (linseed oil) to obtain a surface hydrophobing agent, coating the surface of the salt mist treated dry bamboo material, and performing deep penetration and drying treatment on a coating layer in a baking oven at the temperature of 120 ℃ for 1.5 hours to obtain green mildew-proof bamboo material for food contact, namely a green mildew-proof bamboo fruit basket; the mass fraction of wax in the wax pine butter mixture is 50%; the mass ratio of the turquoise oil mixture to the semi-dry vegetable oil in the surface hydrophobing agent is 1: 4.
the green mildew-proof bamboo woven fruit basket prepared in the embodiment has the following performance test results:
mildew resistance: the mildew test is carried out according to Aspergillus niger (mould) and Coccomys theobromae (discolor bacteria) specified in the national standard GB/T18261-2013 test method for preventing and controlling wood mould and cyanobacteria by mildew agent.
The control efficiency of the chromobacterium is 75 percent, and the control efficiency of the mould is 75 percent.
In this embodiment, the bamboo fruit basket in the step S1 is used as a control, and the performance test results are as follows:
mildew resistance: the control efficiency of the chromobacterium is 17 percent, and the control efficiency of the mould is 0 percent.
Example 4
The preparation method of the green mildew-proof bamboo wood (green mildew-proof bamboo cutting board) for food contact in the embodiment comprises the following steps:
s1, drying the bamboo, namely drying the bamboo (a bamboo cutting board) at the temperature of 75 ℃ to obtain the bamboo to be treated with the water content of 9%;
s2, salt spray gasification and 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 performing salt mist gasification adsorption treatment on the bamboo to be treated by using the salt solution with the temperature of 45 ℃ for 2 hours to obtain the bamboo subjected to salt mist treatment; the redundant salt is recovered, crystallized and purified and then is continuously used; the mass fraction of potassium salt in the salt solution is 20%;
s3, drying the bamboo subjected to salt spray treatment obtained in the step S2 under the condition of superheated steam at the temperature of 125 ℃ until the water content is 27%, and then performing microwave drying until the water content is 13% to obtain salt spray treated and dried bamboo;
s4, surface hydrophobic treatment: leveling the surface of the salt mist treated dry bamboo material obtained in the S3, blowing surface impurities by a high-pressure air gun, dissolving wax (carnauba wax) in turpentine at the temperature of 70 ℃ to obtain a wax turpentine mixture, mixing the wax turpentine mixture with semi-dry vegetable oil (castor oil) to obtain a surface hydrophobing agent, coating the surface of the salt mist treated dry bamboo material, and performing coating layer deep penetration and drying treatment in a baking oven at the temperature of 130 ℃ for 1h to obtain green mildew-proof bamboo material for food contact, namely a green mildew-proof bamboo chopping board; the mass fraction of wax in the wax pine butter mixture is 45 percent; the mass ratio of the turquoise oil mixture to the semi-dry vegetable oil in the surface hydrophobing agent is 1: 3.
the green mildew-proof bamboo chopping block prepared in the embodiment has the following performance test results:
mildew resistance: the mildew test is carried out according to Aspergillus niger (mould) and Cocospora cacao (discolor bacteria) specified in the national standard GB/T18261-2013 test method for preventing and controlling wood mould and blue-changing bacteria.
The control efficiency of the discoloring bacteria is 85 percent, and the control efficiency of the mold is 67 percent;
surface wettability (contact angle): 105 °;
surface hardness (GB/T1941-: the King hardness was 5210N.
In this example, the bamboo chopping block in the step S1 was used as a control, and the results of the performance test were:
mildew resistance: the prevention and treatment efficiency of the discoloring bacteria is 17 percent, and the prevention and treatment efficiency of the mold is 0 percent;
surface wettability (contact angle): 85 degrees;
surface hardness (GB/T1941-: the King hardness was 3980N.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (9)
1. A preparation method of green mildew-proof bamboo wood for food contact is characterized by comprising the following steps:
s1, drying the bamboo wood, namely drying the bamboo wood at the temperature of 60-100 ℃ to obtain the bamboo wood to be treated;
s2, salt spray gasification and 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 performing salt mist 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 the bamboo subjected to salt mist treatment;
s3, drying the bamboo material subjected to the salt fog treatment obtained in the step S2 under the condition of superheated steam at the temperature of 110-130 ℃ until the water content is 20% -30%, and then performing microwave drying until the water content is 10% -15% to obtain salt fog treated and dried bamboo material;
s4, surface hydrophobic treatment: and (2) flattening the surface of the salt mist treated dry bamboo material obtained in the step (S3), blowing surface sundries by using 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, coating the surface of the salt mist treated dry bamboo material, and performing deep penetration and drying treatment on a coating layer in a baking oven at the temperature of 100-135 ℃ to obtain the green mildew-proof bamboo material for food contact.
2. The preparation method of the green mildewproof bamboo material for the food contact according to claim 1, wherein the moisture content of the bamboo material to be treated in the S1 is 8-10%.
3. The method for preparing the green mildewproof bamboo material for the food contact according to claim 1, wherein the mass fraction of the sodium salt or the potassium salt in the salt solution in the S2 is 20 to 30 percent.
4. The method for preparing green mildewproof bamboo material for food contact according to claim 1, wherein the sodium salt in the S2 comprises sodium chloride, sodium nitrate or sodium carbonate; the potassium salt includes potassium chloride.
5. The method for preparing green mildewproof bamboo material for food contact according to claim 1, wherein the mass fraction of the wax in the mixture of the wax and the pine butter in the S4 is 40 to 60 percent.
6. The method for preparing green mildewproof bamboo material for food contact according to claim 1, wherein the mass ratio of the turpentine mixture to the semi-dry vegetable oil in the surface hydrophobizing agent in S4 is 1: (3-5).
7. The method of claim 1, wherein the semi-dry vegetable oil of S4 includes linseed oil, sunflower seed oil, soybean oil or castor oil.
8. The method of claim 1, wherein the wax in S4 includes carnauba wax, beeswax, or candelilla wax.
9. The method for preparing the green mildewproof bamboo material for the food contact according to claim 1, wherein the time of S4 in the baking oven is 0.5 to 2 hours.
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| CN101845274A (en) * | 2009-11-18 | 2010-09-29 | 嘉汉林业(广州)有限公司 | Coating combination for pure natural woodenware |
| CN107175740A (en) * | 2017-07-18 | 2017-09-19 | 福建省瑞祥竹木有限公司 | A kind of anticorrosive mildewproof method of bamboo wood |
| CN108247788A (en) * | 2016-12-28 | 2018-07-06 | 中山市大自然木业有限公司 | A kind of method for improving solid wood slab dimensional stability |
| CN108943233A (en) * | 2018-06-28 | 2018-12-07 | 广德竹之韵工艺品厂 | A kind of mildew-proof treatment method of bamboo |
| CN111732872A (en) * | 2020-04-30 | 2020-10-02 | 中国林业科学研究院林产化学工业研究所 | Preparation method of urushiol-based environment-friendly wood wax oil |
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| CN101845274A (en) * | 2009-11-18 | 2010-09-29 | 嘉汉林业(广州)有限公司 | Coating combination for pure natural woodenware |
| CN108247788A (en) * | 2016-12-28 | 2018-07-06 | 中山市大自然木业有限公司 | A kind of method for improving solid wood slab dimensional stability |
| CN107175740A (en) * | 2017-07-18 | 2017-09-19 | 福建省瑞祥竹木有限公司 | A kind of anticorrosive mildewproof method of bamboo wood |
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