CN115434182A - Antibacterial oil-resistant baking paper and preparation method thereof - Google Patents
Antibacterial oil-resistant baking paper and preparation method thereof Download PDFInfo
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- CN115434182A CN115434182A CN202211119833.0A CN202211119833A CN115434182A CN 115434182 A CN115434182 A CN 115434182A CN 202211119833 A CN202211119833 A CN 202211119833A CN 115434182 A CN115434182 A CN 115434182A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/32—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
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- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
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- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
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- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
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Abstract
The application discloses antibacterial and oil-resistant baking paper and a preparation method thereof, and belongs to the technical field of chemically modified natural fibers; the modified coating is prepared from the following raw materials in parts by weight: 10-20 parts of modified nano-cellulose, 20-40 parts of composite nano-particles and 50-80 parts of silicone oil; the modified nano-cellulose is silylated nano-cellulose, and the composite nano-particles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite.
Description
Technical Field
The application relates to antibacterial and oil-resistant baking paper and a preparation method thereof, and belongs to the technical field of chemically modified natural fibers.
Background
The baking paper is a food paper, can be widely used for baking desserts, baking foods, food microwaves, packaging foods and the like, is mainly used for isolating baking trays and foods (such as bread, cakes and the like) during baking or baking at present, can keep the tastes of the foods, is convenient to clean, can replace partial baking tinfoil (also called aluminum foil paper), and is low in cost and environment-friendly.
At present, baking paper does not have antibacterial performance, and when a small amount of baking paper with the antibacterial performance is baked at high temperature or stored for a long time, antibacterial components gradually lose effectiveness, cannot be used repeatedly, and does not have lasting antibacterial ability; most of the existing baking papers are different in oil resistance and good in oil resistance effect, and often have the defects of strong bioaccumulation and difficult degradation due to the fact that a polymer containing perfluoroalkyl groups is added, and the baking papers are particularly harmful to food in long-term contact.
Disclosure of Invention
In order to solve the problems, the antibacterial and oil-resistant baking paper and the preparation method thereof are provided, and the baking paper has the advantages of lasting and excellent antibacterial performance, excellent oil resistance, good paper strength, safety, no toxicity and repeated use.
According to one aspect of the application, antibacterial and oil-resistant baking paper is provided, and comprises fiber base paper and a modified coating coated on the surface of the fiber base paper;
the modified coating is prepared from the following raw materials in parts by weight: 10-20 parts of modified nano-cellulose, 20-40 parts of composite nano-particles and 50-80 parts of silicone oil; the modified nano-cellulose is silylated nano-cellulose, and the composite nano-particles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite.
Alternatively, the silylated nanocellulose is prepared from nanocellulose and methyltrimethoxysilane.
Optionally, the weight ratio of the nanocellulose to the methyltrimethoxysilane is (3-5): 1.
optionally, the preparation method of the modified nanocellulose comprises the steps of adding the nanocellulose into an ethanol solution, carrying out ultrasonic oscillation, adding methyltrimethoxysilane, uniformly stirring, standing for reaction, and drying to obtain the modified nanocellulose.
Preferably, the mass fraction of the ethanol is 70%, the ultrasonic power is 80W, and the dosage of the ethanol is 20 times of the weight of the nano-cellulose. Preferably, drying is done at room temperature.
Optionally, the ultrasonic time is 5-10min, the stirring speed is 200-400r/min, the stirring time is 2-5min, and the standing time is 2-5h.
Optionally, the composite nanoparticles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite, wherein the weight ratio of the chitosan, the adipic anhydride, the nano-silver to the nano-montmorillonite is 1: (2-4): (0.2-0.5): (1-3).
Optionally, the preparation method of the composite nano-particles comprises the steps of adding chitosan into an acetic acid solution, adding adipic anhydride, stirring, standing for reaction, adding ethanol and a sodium carbonate saturated solution, washing with ethanol to be neutral, adding nano-silver and nano-montmorillonite, performing ultrasonic oscillation, filtering to obtain filaments, washing with distilled water for three times, and performing vacuum drying to obtain the composite nano-particles.
Preferably, the mass fraction of the acetic acid solution is 5%, the dosage of the acetic acid is 30 times of the weight of the chitosan, the mass fraction of the ethanol is 70%, the ultrasonic power is 80W, the ultrasonic time is 3min, and the vacuum drying time is 3-5h.
Optionally, the standing reaction temperature is 25 ℃, the stirring time is 40-60min, the stirring speed is 50-80r/min, the standing reaction time is 5-10h, and the vacuum drying temperature is 40-50 ℃.
According to another aspect of the application, a preparation method of the antibacterial oil-resistant baking paper is further provided, and the preparation method comprises the following steps:
(1) Mixing the modified nano-cellulose, the composite nano-particles and the silicone oil, stirring uniformly and heating;
(2) And (2) uniformly coating the coating obtained in the step (1) on fiber base paper by using a coating machine, drying, and then performing calendaring, rolling and slitting to obtain the antibacterial oil-resistant baking paper.
Optionally, in the step (1), the heating temperature is 50-80 ℃, the stirring speed is 100-200r/min, and the stirring time is 5-10min; the coating amount in the step (2) is 1.5-2.5g/m 2 The drying temperature is 60-80 ℃.
In the present application, "room temperature" means 25 ℃.
Benefits of the present application include, but are not limited to:
1. according to the antibacterial oil-resistant baking paper, the cellulose surface has lower surface energy by using the silylation modified nano-cellulose, and the surface can stably form a-Si-O-C-shaped hydrophobic and oleophobic three-dimensional network structure, so that a good adsorption site is provided for the composite nano-particles while certain hydrophobic and oleophobic performance is achieved, the composite nano-particles can be stably adsorbed on a fiber net and are not easy to run off, and the antibacterial oil-resistant baking paper can provide lasting antibacterial, heat-resistant and oil-resistant performances.
2. According to the antibacterial oil-resistant baking paper, chitosan is acylated and modified by using adipic anhydride, amino and hydroxyl of chitosan react with anhydride to generate acylated chitosan derivatives, the high temperature resistance and toughness of the baking paper are improved, and Ag can be stably adsorbed while the adsorption capacity of the chitosan is increased + Effective adsorption, greatly reduces the loss of nano-silver, changes the permeability of microbial cell membranes due to the interaction of the positive charges of chitosan and the negative charges on the surfaces of microbial cells, has good sterilization and bacteriostasis effects, and can stably adsorb Ag with strong sterilization effect + Therefore, the baking paper has lasting and excellent antibacterial performance and long service life;
meanwhile, the nano montmorillonite is inserted between the chitosan in a sheet structure, so that the oleophobic property is improved, the structure is compact, and the oil seepage prevention effect is good.
3. According to the antibacterial oil-resistant baking paper, the weight ratio of nano-cellulose to methyltrimethoxysilane is limited, excessive silica-based treatment is avoided, the cellulose surface is excessively rough, the formed three-dimensional network is stable, the strength is good, and the adsorption and combination of composite nano-particles are facilitated.
4. According to the antibacterial oil-resistant baking paper, the weight ratio of chitosan, adipic anhydride, nano silver and nano montmorillonite is limited, excessive acylation chitosan is avoided, meanwhile, better dispersion of nano substances is achieved, agglomeration and other phenomena are reduced, uniform dispersion of composite nano particles in silicone oil and modified nano cellulose three-dimensional networks can be guaranteed, uniform dispersion of the nano substances in the composite nano particles can also be guaranteed, and stability of oil-resistant sterilization performance is guaranteed.
5. According to the preparation method of the antibacterial oil-resistant baking paper, the steps are simple and easy to operate, the method is green and environment-friendly, and the preparation method is suitable for large-scale production and application.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described in this patent are for illustrative purposes only.
In addition, this application is dried and is adopted current drying cylinder equipment, and press polish, rolling and cut all adopt current equipment, and the compression roller temperature is 70 ℃. The chitosan is a commercial product, the deacetylation degree is 87 percent, and the molecular weight is 800kDa.
Example 1 baking paper 1#
The baking paper No. 1 consists of fiber base paper and a modified coating coated on the surface of the fiber base paper, wherein the modified coating is prepared from the following raw materials in parts by weight: 15 parts of modified nano-cellulose, 30 parts of composite nano-particles and 60 parts of silicone oil.
Wherein the modified nano-cellulose is silylated nano-cellulose, and the weight ratio of the nano-cellulose to the methyltrimethoxysilane is 4:1;
the preparation method comprises the steps of adding the nano-cellulose into an ethanol solution, carrying out ultrasonic oscillation, adding the methyltrimethoxysilane, uniformly stirring, standing for reaction, and drying to obtain the nano-cellulose; wherein the ultrasonic treatment time is 8min, the stirring speed is 300r/min, the stirring time is 4min, the standing time is 3h, the mass fraction of ethanol is 70%, the ultrasonic treatment power is 80W, the dosage of ethanol is 20 times of the weight of the nano-cellulose, and the drying is carried out at room temperature.
The composite nano-particles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite, and the weight ratio is 1:3:0.3:2;
adding chitosan into an acetic acid solution, adding adipic anhydride, stirring, standing for reaction, adding an ethanol and sodium carbonate saturated solution, washing with ethanol to be neutral, adding nano-silver and nano-montmorillonite, performing ultrasonic oscillation, filtering to obtain filaments, washing with distilled water for three times, and performing vacuum drying to obtain composite nano-particles; the mass fraction of the acetic acid solution is 5%, the dosage of the acetic acid is 30 times of the weight of the chitosan, the mass fraction of the ethanol is 70%, the ultrasonic power is 80W, the ultrasonic time is 3min, and the vacuum drying time is 4h; the standing reaction temperature is 25 ℃, the stirring time is 50min, the stirring speed is 60r/min, the standing reaction time is 8h, and the vacuum drying temperature is 45 ℃.
The preparation method of the baking paper 1# comprises the following steps:
(1) Mixing the modified nano-cellulose, the composite nano-particles and the silicone oil, stirring uniformly and heating;
(2) And (2) uniformly coating the coating obtained in the step (1) on fiber base paper by using a coating machine, drying, and then performing calendaring, rolling and slitting to obtain the antibacterial and oil-resistant baking paper No. 1.
Wherein the heating temperature in the step (1) is 60 ℃, the stirring speed is 150r/min, and the stirring time is 8min; the coating amount in the step (2) is 2g/m 2 And dryingThe temperature was 70 ℃.
Example 2 baking paper 2#
The baking paper No. 2 consists of fiber base paper and a modified coating coated on the surface of the fiber base paper, and the modified coating is prepared from the following raw materials in parts by weight: 10 parts of modified nano-cellulose, 20 parts of composite nano-particles and 50 parts of silicone oil.
Wherein the modified nano-cellulose is silylated nano-cellulose, and the weight ratio of the nano-cellulose to the methyltrimethoxysilane is 3:1;
the preparation method comprises the steps of adding the nano-cellulose into an ethanol solution, carrying out ultrasonic oscillation, adding the methyltrimethoxysilane, uniformly stirring, standing for reaction, and drying to obtain the nano-cellulose; wherein the ultrasonic treatment time is 5min, the stirring speed is 200r/min, the stirring time is 2min, the standing time is 2h, the mass fraction of ethanol is 70%, the ultrasonic treatment power is 80W, the dosage of ethanol is 20 times of the weight of the nano-cellulose, and the drying is carried out at room temperature.
The composite nano-particles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite, and the weight ratio is 1:2:0.2:1;
adding chitosan into an acetic acid solution, adding adipic anhydride, stirring, standing for reaction, adding an ethanol and sodium carbonate saturated solution, washing with ethanol to neutrality, adding nano-silver and nano-montmorillonite, performing ultrasonic oscillation, filtering to obtain filaments, washing with distilled water for three times, and performing vacuum drying to obtain composite nano-particles; the mass fraction of the acetic acid solution is 5%, the dosage of the acetic acid is 30 times of the weight of the chitosan, the mass fraction of the ethanol is 70%, the ultrasonic power is 80W, the ultrasonic time is 3min, and the vacuum drying time is 3h; the standing reaction temperature is 25 ℃, the stirring time is 40min, the stirring speed is 50r/min, the standing reaction time is 5h, and the vacuum drying temperature is 40 ℃.
The preparation method of the baking paper 2# comprises the following steps:
(1) Mixing the modified nano-cellulose, the composite nano-particles and the silicone oil, stirring uniformly and heating;
(2) And (2) uniformly coating the coating obtained in the step (1) on fiber base paper by using a coating machine, drying, and then performing calendaring, rolling and slitting to obtain the antibacterial and oil-resistant baking paper No. 2.
Wherein the heating temperature in the step (1) is 50 ℃, the stirring speed is 100r/min, and the stirring time is 5min; the coating amount in the step (2) is 1.5g/m 2 The drying temperature is 60 ℃.
Example 3 baking paper 3#
The baking paper No. 3 consists of fiber base paper and a modified coating coated on the surface of the fiber base paper, wherein the modified coating is prepared from the following raw materials in parts by weight: 20 parts of modified nano-cellulose, 40 parts of composite nano-particles and 80 parts of silicone oil.
Wherein the modified nano-cellulose is silylated nano-cellulose, and the weight ratio of the nano-cellulose to the methyltrimethoxysilane is 5:1;
the preparation method comprises the steps of adding the nano-cellulose into an ethanol solution, carrying out ultrasonic oscillation, adding the methyltrimethoxysilane, uniformly stirring, standing for reaction, and drying to obtain the nano-cellulose; wherein the ultrasonic treatment time is 10min, the stirring speed is 400r/min, the stirring time is 5min, the standing time is 5h, the mass fraction of ethanol is 70%, the ultrasonic treatment power is 80W, the dosage of ethanol is 20 times of the weight of the nano-cellulose, and the drying is carried out at room temperature.
The composite nano-particles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite, and the weight ratio is 1:4:0.5:3;
adding chitosan into an acetic acid solution, adding adipic anhydride, stirring, standing for reaction, adding an ethanol and sodium carbonate saturated solution, washing with ethanol to be neutral, adding nano-silver and nano-montmorillonite, performing ultrasonic oscillation, filtering to obtain filaments, washing with distilled water for three times, and performing vacuum drying to obtain composite nano-particles; the mass fraction of the acetic acid solution is 5%, the dosage of the acetic acid is 30 times of the weight of the chitosan, the mass fraction of the ethanol is 70%, the ultrasonic power is 80W, the ultrasonic time is 3min, and the vacuum drying time is 5h; the standing reaction temperature is 25 ℃, the stirring time is 60min, the stirring speed is 80r/min, the standing reaction time is 10h, and the vacuum drying temperature is 50 ℃.
The preparation method of the baking paper 3# comprises the following steps:
(1) Mixing the modified nano-cellulose, the composite nano-particles and the silicone oil, stirring uniformly and heating;
(2) And (2) uniformly coating the coating obtained in the step (1) on fiber base paper by using a coating machine, drying, and then performing calendaring, rolling and slitting to obtain the antibacterial and oil-resistant baking paper No. 3.
Wherein the heating temperature in the step (1) is 80 ℃, the stirring speed is 200r/min, and the stirring time is 10min; the coating amount in the step (2) is 2.5g/m 2 The drying temperature is 80 ℃.
Comparative example 1# comparative baking paper 1#
Comparative example 1 differs from example 1 in that: no methyltrimethoxysilane was used in comparative example 1.
Comparative example 2# comparative baking paper No. 2#
Comparative example 2 differs from example 1 in that: adipic anhydride was not used in comparative example 2.
Comparative example 3# comparative baking paper 3#
Comparative example 3 differs from example 1 in that: in comparative example 3 no chitosan and no adipic anhydride were used.
Comparative example 4# comparative baking paper 4#
Comparative example 4 differs from example 1 in that: in comparative example 4 no nanomontmorillonite was used.
Comparative example 5# comparative baking paper 5#
Comparative example 5 differs from example 1 in that: comparative example 5 the weight ratio of nanocellulose and methyltrimethoxysilane was 1:1.
comparative example No. 6 comparative baking paper No. 6#
Comparative example 6 differs from example 1 in that: in comparative example 6 the weight ratio of chitosan to adipic anhydride was 1:6.
example 4 characterization of properties
1. Mechanical Property measurement
(1) The baking paper No. 1-3 # and the comparative baking paper No. 1-6 # were tested for tensile strength according to GB/T12914;
(2) And (3) cutting the baking paper No. 1-3 and the comparative baking paper No. 1-6 into pieces with the length of 15cm and the width of 2cm, selecting a common adhesive tape with the width of 2cm, bonding and superposing the two pieces of paper with the length of 10cm, testing on a tensile machine, and recording the stripping force as the stripping strength, wherein the unit is N. Repeat 3 times to get the average value. The results are shown in Table 1.
TABLE 1 determination of mechanical Properties
The results show that the baked paper # 1-3 prepared by using the raw materials and the method defined in the application has excellent tensile strength and low peel strength, and show that the baked paper is easy to peel and is not easy to adhere to food.
Compared with the baking paper No. 1, the performance is poorer, and the analysis shows that the cellulose is not modified and the mechanical property is poor; compared with baking paper No. 2 chitosan, the performance is poor because the chitosan is not modified; compared with baking paper No. 3, chitosan and adipic anhydride are not used, so that uniformly dispersed composite nano particles cannot be formed finally, and the performance is poor; compared with baking paper No. 4, nano montmorillonite is not used, and the final performance is poorer; the weight ratio of the 5# nano cellulose to the methyltrimethoxysilane of the contrast baking paper is not within the range defined by the application, and the final performance is poor; the weight ratio of comparative baking paper No. 6 chitosan to adipic anhydride was outside the range defined in the present application and the final properties were poor.
2. Test of antibacterial Property
The results of examining the antibacterial ratio of the baked paper No. 1-3 and the comparative baked paper No. 1-6 according to GB/T21866 are shown in Table 2.
TABLE 2 determination of antibacterial experiments
The result shows that the baking paper No. 1-3 prepared by the raw materials and the method defined by the application has excellent antibacterial effect, the daily antibacterial rate is over 99.8 percent, the continuous antibacterial capability is strong, the antibacterial rate is over 98 percent after one month, and the baking paper can be repeatedly used for many times.
3. Testing of Heat and oil resistance
The oil repellency rating of the baked paper # 1-3 and the comparative baked paper # 1-6 was determined according to TAPPI standard T559 pm-96. And (4) testing the high-temperature resistance of the baking paper 1# -3# and the comparative baking paper 1# -6# according to QB/T1010-2010. The results are shown in Table 3.
TABLE 3 oil and Heat resistance test
The result shows that the baking paper No. 1-3 prepared by the raw materials and the method defined by the application has excellent oil resistance, the oil resistance grade is more than 11, the high temperature resistance is excellent, and the highest service temperature is more than 250 ℃.
The above description is only an example of the present application, and the protection scope of the present application is not limited by these specific examples, but is defined by the claims of the present application. Various modifications and changes may occur to those skilled in the art to which the present application pertains. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The antibacterial and oil-resistant baking paper is characterized by comprising fiber base paper and a modified coating coated on the surface of the fiber base paper;
the modified coating is prepared from the following raw materials in parts by weight: 10-20 parts of modified nano-cellulose, 20-40 parts of composite nano-particles and 50-80 parts of silicone oil;
the modified nano-cellulose is silylated nano-cellulose, and the composite nano-particles are prepared from chitosan, adipic anhydride, nano-silver and nano-montmorillonite.
2. Baking paper according to claim 1, characterized in that silylated nanocellulose is prepared from nanocellulose and methyltrimethoxysilane.
3. Baking paper as claimed in claim 2, characterized in that the weight ratio between nanocellulose and methyltrimethoxysilane is (3-5): 1.
4. the baking paper as claimed in claim 3, wherein the modified nanocellulose is prepared by adding nanocellulose into ethanol solution, performing ultrasonic oscillation, adding methyltrimethoxysilane, stirring uniformly, standing for reaction, and drying.
5. Baking paper as claimed in claim 4, characterized in that the ultrasound time is 5-10min, the stirring rate is 200-400r/min, the stirring time is 2-5min, and the standing time is 2-5h.
6. Baking paper according to claim 1, characterized in that the weight ratio of chitosan, adipic anhydride, nano silver and nano montmorillonite is 1: (2-4): (0.2-0.5): (1-3).
7. Baking paper as claimed in claim 6, wherein the composite nanoparticles are prepared by adding chitosan into acetic acid solution, adding adipic anhydride, stirring, standing for reaction, adding into saturated solution of ethanol and sodium carbonate, washing with ethanol to neutrality, adding nano silver and nano montmorillonite, ultrasonic vibrating, filtering to obtain filaments, washing with distilled water for three times, and vacuum drying to obtain composite nanoparticles.
8. Baking paper according to claim 7, characterized in that the standing reaction temperature is 25 ℃, the stirring time is 40-60min, the stirring rate is 50-80r/min, the standing reaction time is 5-10h, and the vacuum drying temperature is 40-50 ℃.
9. A method of making antimicrobial oil resistant baking paper as claimed in any of claims 1 to 8 comprising the steps of:
(1) Mixing the modified nano-cellulose, the composite nano-particles and the silicone oil, stirring uniformly and heating;
(2) And (2) uniformly coating the coating obtained in the step (1) on fiber base paper by using a coating machine, drying, and then performing calendaring, rolling and slitting to obtain the antibacterial and oil-resistant baking paper.
10. The preparation method according to claim 9, wherein the heating temperature in step (1) is 50-80 ℃, the stirring speed is 100-200r/min, and the stirring time is 5-10min; the coating amount in the step (2) is 1.5-2.5g/m 2 The drying temperature is 60-80 ℃.
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