CN110552252A - Conductive heating food packaging paper and preparation method thereof - Google Patents
Conductive heating food packaging paper and preparation method thereof Download PDFInfo
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- CN110552252A CN110552252A CN201910852886.5A CN201910852886A CN110552252A CN 110552252 A CN110552252 A CN 110552252A CN 201910852886 A CN201910852886 A CN 201910852886A CN 110552252 A CN110552252 A CN 110552252A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
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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
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
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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
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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
-
- 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
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Wrappers (AREA)
- Paper (AREA)
Abstract
The invention relates to conductive heating food packaging paper and a preparation method thereof, belonging to the field of food packaging paper in the papermaking industry, wherein the conductive heating food packaging paper comprises packaging base paper, a conductive heating layer and a PLA (polylactic acid) coating layer which are sequentially laminated from bottom to top, wherein the conductive heating layer is made of modified graphene/carbon nano tube/nano cellulose conductive heating coating, the thickness of the conductive heating layer is 5-50 mu m, the resistance of the conductive heating layer is 20-200 omega, and the area of the conductive heating layer is 100-500cm 2.
Description
Technical Field
The invention belongs to the field of food packaging paper in the papermaking industry, and particularly relates to conductive heating food packaging paper and a preparation method thereof.
Background
At present, self-heating food packaging paper or a container reported in the prior literature mainly realizes heating of food through chemical reaction of an attached heating bag, and the self-heating food packaging material has large volume and weight and has certain food safety problems such as leakage and the like in the operation process. In order to solve the above problems, it is urgently needed to develop a novel food heating method, which can ensure food safety and eliminate potential safety hazards while realizing rapid heat preservation and heating of food.
Conductive heating food packaging paper is a novel heating packaging material, and specifically is a conductive heating coating layer is further manufactured on food packaging base paper, and the heating layer is electrified to convert electric energy into heat energy, so that the heating layer is heated to reach the temperature suitable for heating food. The preparation of the conductive heating food packaging paper mainly needs to solve the core problems of the following two aspects: 1) the development and preparation of the conductive coating ensure that the finally prepared conductive heating layer is tightly combined with the base paper, the adhesion performance is good, and the resistance is easy to regulate and control; 2) the conductive heating layer is prepared by adopting a coating mode, and a proper coating process is confirmed by combining the performance of the conductive coating. For heating food, it is desirable to maintain the heating temperature at 70-80 deg.C to keep the food in a good heating state. In addition, the heating efficiency of the wrapping paper is directly influenced by the heating rate of the wrapping paper. Therefore, the heating rate of the heating food packaging paper after being electrified and whether the final temperature is maintained at 70-80 ℃ are two main technical indexes for measuring the heating performance, and no relevant solution reported in documents is found in the current relevant research.
For the above reasons, the present application has been made.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide conductive heating food packaging paper and a preparation method thereof. The food packaging paper developed by the invention can be electrified by an external mobile power supply or a battery pack, so that the food can be quickly heated in a heat preservation manner, the food safety can be ensured, and the eating efficiency can be improved.
In order to achieve the first object of the present invention, the present invention adopts the following technical solutions:
The utility model provides a conductive heating food package paper, includes from supreme packing body paper, conductive heating layer and the PLA drenches the rete down that stacks gradually, wherein, conductive heating layer is made by modified graphite alkene/carbon nanotube/nano-cellulose conductive heating coating, conductive heating layer thickness is 5-50 mu m.
further, according to the technical scheme, the quantitative weight of the packaging paper is 40-100g/m 2.
Further, according to the technical scheme, the resistance of the conductive heating layer is 20-200 omega, and the area of the conductive heating layer is 100-500cm 2.
Further, according to the technical scheme, the quantitative amount of the PLA PE leaching film layer is 10-40g/m 2.
Further, according to the technical scheme, the packaging base paper is prepared by mixing wood pulp, AKD and cationic starch according to a mass ratio of 1: 0.01-0.03: 0.01 to 0.04 percent of the raw materials are mixed and ground into pulp, the concentration of the ground pulp is controlled to be 4 to 6 percent, the beating degree is controlled to be 60 to 70 degrees SR, and the mixture is manufactured by a fourdrinier machine.
Preferably, in the technical scheme, the mixed wood pulp is prepared by mixing wood pulp with a mass ratio of 1: 1-4 of softwood pulp and hardwood pulp.
Further, according to the technical scheme, the modified graphene/carbon nanotube/nanocellulose conductive heating coating is composed of 1-naphthoic acid modified multilayer graphene, carbon nanotubes, absolutely dry nanocellulose (CNF) and water, wherein: the mass ratio of the 1-naphthoic acid modified multilayer graphene to the carbon nanotube to the absolutely dry nanocellulose to water is 1: 0.05-0.2: 0.025-0.1: 1-10.
Furthermore, in the technical scheme, the solid content of the conductive heating coating is preferably 40-60%.
Furthermore, in the technical scheme, the 1-naphthoic acid modified multilayer graphene is prepared by the following method: dissolving 1-naphthoic acid in absolute ethyl alcohol according to a ratio to obtain a 1-naphthoic acid ethanol solution, then adding multilayer graphene into the 1-naphthoic acid ethanol solution, uniformly stirring at normal temperature, and filtering to obtain non-covalent bond modified multilayer graphene, namely the 1-naphthoic acid modified multilayer graphene.
Specifically, in the above technical scheme, the normal temperature refers to a natural room temperature condition in four seasons, no additional cooling or heating treatment is performed, and the normal temperature is generally controlled to be 10-30 ℃, preferably 15-25 ℃.
Preferably, in the technical scheme, the concentration of the 1-naphthoic acid in the 1-naphthoic acid ethanol solution is 5-20 g/L.
Preferably, in the above technical scheme, the mass ratio of the multilayer graphene to 1-naphthoic acid is 1: 5-20.
Preferably, in the technical scheme, the stirring speed is 300-600r/min, and the stirring time is 20-40 min.
The modified multilayer graphene is specifically non-covalent bond modified multilayer graphene. The above modification mechanism is as follows: the 1-naphthoic acid is adsorbed on the surface of the graphene through a pi-pi bond, and the carboxyl can enable the modified graphene to have better dispersibility in a coating system.
Furthermore, in the technical scheme, the oven-dried nano-cellulose is prepared by adopting a high-pressure homogenization method, and the method specifically comprises the following steps: fully pulping bleached hardwood pulp or bleached softwood pulp with the mass concentration of 0.5-1% to enable the pulping degree to reach 80-95 DEG SR, then homogenizing the bleached wood pulp by using a homogenizer to obtain a nano-cellulose suspension, and finally freeze-drying the obtained nano-cellulose suspension to obtain the oven-dried nano-cellulose.
Preferably, in the above technical scheme, the pressure of the homogenization treatment is 80-100MPa, and the number of times of the homogenization treatment is 10-20.
Preferably, in the technical scheme, the freeze drying temperature is-40 ℃ to-10 ℃, and the drying time is 12-36 h.
The modified graphene/carbon nanotube/nano-cellulose conductive heating coating is prepared by the following method: 1-naphthoic acid modified multilayer graphene, a carbon nano tube, absolutely dry nano cellulose and water are mixed according to a mass ratio of 1: 0.05-0.2: 0.025-0.1: 1-10, and continuously stirring uniformly after ultrasonic dispersion to obtain the modified graphene/carbon nano tube/nano cellulose conductive coating.
Preferably, in the technical scheme, the stirring time is 30-60 min.
The second purpose of the invention is to provide a preparation method of the conductive heating food packaging paper, and specifically, the modified graphene/carbon nanotube/nanocellulose conductive coating is coated on the packaging base paper, and after drying, PLA laminating and drying are further performed, and finally slitting is performed, so that the conductive heating food packaging paper is obtained.
Preferably, in the above technical solution, the coating manner is blade coating.
The raw material components adopted by the invention have the following functions:
Graphene is a main component of the conductive coating, and the specific gravity of the graphene determines the resistance of the conductive coating, so that the temperature rise performance of the conductive heating food packaging paper is influenced; because the binding force between the pure graphene serving as the coating and the paper is not ideal, the nano-cellulose is used as the binder, so that the graphene forms a coating on the paper, and the specific gravity of the nano-cellulose can adjust the viscosity of the coating, so that the performance of the coating is easier to adjust and control; the carbon nano tube has the effect of constructing more connection points between the lamellar graphene, so that the overall electrification performance of the coating is improved, and the heating performance of the coating is further improved.
Compared with the prior art, the conductive heating food packaging paper and the preparation method thereof have the following beneficial effects:
(1) The method for modifying the graphene by the 1-naphthoic acid is a non-covalent bond modification method, has the advantages of high efficiency and low cost, more carboxyl groups are arranged on the surface of the modified graphene, and the modified graphene, the carbon nano tube and bleached wood pulp (containing carboxyl groups) can form a conductive coating with excellent dispersibility, so that the improvement and control of the conductive performance of the product are facilitated.
(2) The nano-cellulose and the paper base material adopted in the invention are both made of natural degradable plant fiber raw materials, and compared with an organic polymer film, the product has less pollution to the environment.
(3) the viscosity of the conductive coating prepared by the invention can be adjusted by the addition amount of the nano-cellulose; and through the combination with the papermaking process, the processing technology of the product is mature and the cost is lower; the coating prepared by the scraper coating process is stable in thickness, easy to produce packaging paper with stable conductivity and high in production efficiency.
(4) The graphene, the nano-cellulose and the paper-based material used in the invention have good adhesion performance, and are further subjected to PLA (polylactic acid) film coating treatment, so that the PLA layer can achieve the purposes of water resistance and oil resistance, and simultaneously has a barrier effect between food and the conductive coating, so that the food is not in contact with the conductive coating. The conductive heating food wrapping paper prepared by the method can be used for heating food under the condition of electrification and is harmless to the food.
(5) The food packaging paper prepared by the invention can be electrified by a 24v power supply, so that the food can be quickly heated in a heat preservation way, the food safety can be ensured, the edible efficiency can be improved, in addition, the product has a higher practical value in activities such as mountaineering, camping, army marching and the like of donkey friends, and potential hazards such as fire hazard and the like caused by heating fire are avoided.
Drawings
Fig. 1 is a process flow diagram for preparing the conductive heating food wrapping paper of the present invention.
FIG. 2 is a mathematical model diagram of the relationship between the temperature rise performance of the conductive heating food wrapping paper and the resistance of the wrapping paper and the size of the wrapping paper.
Figure 3 is a schematic diagram of a four edge sealed package of the conductive heating food wrapping paper of the present invention, with different easy tear line designs.
Detailed Description
The present invention will be described in further detail below with reference to examples. The present invention is implemented on the premise of the technology of the present invention, and the detailed embodiments and specific procedures are given to illustrate the inventive aspects of the present invention, but the scope of the present invention is not limited to the following embodiments.
Various modifications to the precise description of the invention will be readily apparent to those skilled in the art from the information contained herein without departing from the spirit and scope of the appended claims. It is to be understood that the scope of the invention is not limited to the procedures, properties, or components defined, as these embodiments, as well as others described, are intended to be merely illustrative of particular aspects of the invention. Indeed, various modifications of the embodiments of the invention which are obvious to those skilled in the art or related fields are intended to be covered by the scope of the appended claims.
For a better understanding of the invention, and not as a limitation on the scope thereof, all numbers expressing quantities, percentages, and other numerical values used in this application are to be understood as being modified in all instances by the term "about". Accordingly, unless expressly indicated otherwise, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
The speed of the heating of the conductive heating food packaging paper and the finally reached highest temperature are mainly influenced by the resistance of the heating layer, and the faster the resistance is, the higher the temperature can be reached. The thickness of the coating is one of the main factors affecting the resistance of the coating, with greater thicknesses giving less resistance. The thickness of the conductive heating coating is controlled to be 5-50 mu m, the temperature can not meet the requirement when the thickness is too small, and the flexibility, the production cost and the like are influenced when the thickness is too high.
The invention also develops a feasible regulating and controlling technology of the temperature rising performance of the conductive heating food packaging paper by controlling the coating components, the coating thickness, the packaging paper size, the power supply voltage and the like, establishes a systematic guidance scheme, can prepare a constant-temperature conductive heating layer with any target temperature within the range of 60-90 ℃, has the performance of high-efficiency temperature rising, and provides good conditions for heating food.
The temperature rise performance regulation and control technical scheme includes that the resistance of a conductive heating layer is optimal at 20-200 omega, the temperature rise speed is low when the resistance is too high, the temperature cannot meet the requirement, the paper is burnt when the temperature rise speed is too low, the cut packaging paper is not too large, the 100-500cm 2 is optimal, the square shape is optimal, the time for rising the temperature to the ideal temperature is required to be as small as possible for improving the temperature rise efficiency, and the regulation and control can be realized by reducing the length-width ratio and increasing the thickness of the coating layer.
Use of conductive heating food wrapping paper: an electrode may be mounted on the conductive heating layer to be in sufficient contact with the conductive heating layer, thereby connecting the conductive heating layer to an external power source through a wire and the electrode. Alternatively, the conductive heating layer may be connected to an external power source by other means known to those skilled in the art. The external power supply can select a mobile power supply or a battery pack, the conductive heating layer is electrified and heated, and the voltage of the mobile power supply can be 12v or 24 v.
In practical use, the conductive heating food packaging paper is subjected to four-edge sealing packaging (as shown in fig. 3), an easy-to-tear line is made on the edge sealing by using a scribing machine, and the torn paper can be used as a lead and fixed on a mobile power supply or a positive electrode and a negative electrode of a battery pack to realize electric heating. Two different easy tear line designs about fig. 3 can realize different paper base wire length, the concrete application of being convenient for. In addition, if the power supply is provided with the crocodile clip, the two ends of the diagonal line of the wrapping paper can be directly heated.
In order to ensure the service performance, the quantitative amount of the wrapping paper is controlled to be 40-100g/m 2 and the quantitative amount of the laminating layer is controlled to be 10-40g/m 2.
The temperature rising performance of the conductive heating food wrapping paper of the present invention is explained below by specific examples.
It should be further noted that 12v and 24v are commonly used outdoor power supply voltages, and the invention can realize ideal temperature rise performance when used in conjunction with 24v power supply voltage.
In addition, the food packaging paper prepared by the conductive heating coating can be electrified by a 24v power supply, so that the food can be quickly heated in a heat preservation manner, the food safety can be ensured, the edible efficiency can be improved, and in addition, the product has a higher practical value in activities such as mountaineering, camping and army marching of donkey friends, and the potential hazards such as fire caused by heating caused by fire are avoided.
Example 1
the conductive heating food packaging paper comprises packaging base paper, a conductive heating layer and a PLA (polylactic acid) coating layer which are sequentially laminated from bottom to top, wherein the packaging paper is 100g/m 2 in quantitative amount, the resistance of the conductive heating layer is 56.8 omega, the area of the conductive heating layer is 200cm 2, the PLA coating layer is 40g/m 2 in quantitative amount, the conductive heating layer is made of a modified graphene/carbon nano tube/nanofiber conductive heating coating, the solid content of the modified graphene/carbon nano tube/nanofiber conductive heating coating is 50%, and the modified graphene/carbon nano tube/nanofiber conductive heating coating is composed of 1-naphthoic acid modified multi-layer graphene, carbon nano tubes, absolutely dry nano Cellulose (CNF) and water in a mass ratio of 1: 0.05: 0.025: 1.075.
The specific preparation method of the conductive heating food packaging paper comprises the following steps:
(1) Preparation of packaging base paper
Mixing mixed wood pulp, AKD and cationic starch according to a mass ratio of 1: 0.025: 0.02 mixing, and then manufacturing food packaging base paper by using a single fourdrinier machine; wherein: the mixed wood pulp is prepared by mixing the following components in a mass ratio of 1: 3, the softwood pulp and the hardwood pulp are mixed and then are ground into pulp, the grinding concentration is controlled at 6%, and the beating degree is controlled at 65 DEG SR.
(2) Preparation of the conductive heating layer
(a) Dissolving 1-naphthoic acid in anhydrous ethanol, and controlling the concentration of 1-naphthoic acid at 10 g/L. Then adding the multilayer graphene into the 1-naphthoic acid ethanol solution, stirring for 30min at room temperature under the condition of 400r/min, and filtering to obtain non-covalent bond modified multilayer graphene, namely the 1-naphthoic acid modified multilayer graphene; wherein: the mass ratio of the multilayer graphene to the 1-naphthoic acid is 1: 10.
(b) fully pulping bleached hardwood pulp with the mass concentration of 0.5% to enable the pulping degree to reach 90 DEG SR, homogenizing the bleached wood pulp by using a homogenizer at the homogenizing pressure of 100MPa for 20 times of homogenizing circulation treatment to prepare nano-cellulose suspension, placing the nano-cellulose suspension in a freeze dryer, and freeze-drying for 12 hours at the temperature of minus 40 ℃ to obtain the oven-dried nano-cellulose.
(c) mixing the components in a mass ratio of 1: 0.05: 0.025: 1.075 the 1-naphthoic acid modified multilayer graphene, the carbon nanotube, the oven-dried nanocellulose and water are mixed, and uniformly dispersed for 50min by using a common ultrasonic cleaning machine and a stirrer to prepare the modified graphene/carbon nanotube/nanocellulose conductive coating, wherein the solid content of the conductive coating is 50%.
(3) preparation of PLA drench film layer
2Coating the modified graphene/carbon nano tube/nano cellulose conductive coating prepared in the step (2) on the food packaging base paper obtained in the step (1) by using a scraper coater, then freeze-drying the modified graphene/carbon nano tube/nano cellulose conductive coating in a freeze-drying oven at the temperature of-20 ℃ for 2 hours, drying the modified graphene/carbon nano tube/nano cellulose conductive coating to obtain a conductive heating layer, further performing PLA (polylactic acid) film coating on the surface of the conductive heating layer, continuously freeze-drying the conductive heating layer in the freeze-drying oven at the temperature of-20 ℃ for 2 hours, and finally cutting the conductive heating food packaging paper to obtain the conductive heating food packaging paper.
The conductive heating food packaging paper prepared in the embodiment is used as follows: a common 24v mobile power supply is selected to electrify and heat the conductive heating layer, so that the temperature of the food packaging paper can be raised to 55 ℃, and the highest constant temperature of 78.1 ℃ can be reached under the condition of normal temperature of 23.1 ℃.
Example 2
The conductive heating food packaging paper comprises packaging base paper, a conductive heating layer and a PLA (polylactic acid) film coating layer which are sequentially laminated from bottom to top, wherein the packaging paper is 80g/m 2 in quantitative amount, the resistance of the conductive heating layer is 20 omega, the area of the conductive heating layer is 500cm 2, the PLA film coating layer is 30g/m 2 in quantitative amount, the conductive heating layer is made of a modified graphene/carbon nano tube/nano fiber conductive heating coating, the solid content of the modified graphene/carbon nano tube/nano cellulose conductive heating coating is 40%, and the modified graphene/carbon nano tube/nano cellulose conductive heating coating is composed of 1-naphthoic acid modified multi-layer graphene, carbon nano tubes, absolutely dry nano Cellulose (CNF) and water in a mass ratio of 1: 0.1: 0.1: 1: 1.8.
The specific preparation method of the conductive heating food packaging paper comprises the following steps:
(1) Preparation of packaging base paper
Mixing mixed wood pulp, AKD and cationic starch according to a mass ratio of 1: 0.01: 0.01, and then manufacturing food packaging base paper by using a single fourdrinier machine; wherein: the mixed wood pulp is prepared by mixing the following components in a mass ratio of 1: 1, the softwood pulp and the hardwood pulp are mixed and then are ground to form the pulp, the grinding concentration is controlled to be 4%, and the beating degree is controlled to be 70 DEG SR.
(2) Preparation of the conductive heating layer
(a) Dissolving 1-naphthoic acid in anhydrous ethanol, and controlling the concentration of 1-naphthoic acid at 5 g/L. Then adding the multilayer graphene into the 1-naphthoic acid ethanol solution, stirring for 40min at room temperature under the condition of 300r/min, and filtering to obtain non-covalent bond modified multilayer graphene, namely the 1-naphthoic acid modified multilayer graphene; wherein: the mass ratio of the multilayer graphene to the 1-naphthoic acid is 1: 5.
(b) Fully pulping bleached softwood pulp with the mass concentration of 0.5% to enable the beating degree to reach 85 DEG SR, homogenizing the bleached softwood pulp by using a homogenizer at the homogenizing pressure of 80MPa for 20 times of homogenizing circulation treatment to prepare nano-cellulose suspension, placing the nano-cellulose suspension in a freeze dryer, and freeze-drying for 24 hours at the temperature of minus 20 ℃ to obtain the oven-dried nano-cellulose.
(c) Mixing the components in a mass ratio of 1: 0.1: 0.1: 1.8, mixing the 1-naphthoic acid modified graphene, the carbon nano tube, the oven-dried nano cellulose and water, and uniformly dispersing for 50min by using a common ultrasonic cleaning machine and a stirrer to prepare the modified graphene/carbon nano tube/nano cellulose conductive coating, wherein the solid content of the conductive coating is 40%.
(3) Preparation of PLA drench film layer
2Coating the modified graphene/carbon nano tube/nano cellulose conductive coating prepared in the step (2) on the food packaging base paper obtained in the step (1) by using a scraper coater, then freeze-drying the modified graphene/carbon nano tube/nano cellulose conductive coating in a freeze-drying oven at the temperature of-20 ℃ for 2 hours, drying the modified graphene/carbon nano tube/nano cellulose conductive coating to obtain a conductive heating layer, further performing PLA (polylactic acid) film coating on the surface of the conductive heating layer, continuously freeze-drying the conductive heating layer in the freeze-drying oven at the temperature of-20 ℃ for 2 hours, and finally cutting the conductive heating food packaging paper to obtain the conductive heating food packaging paper.
The conductive heating food packaging paper prepared in the embodiment is used as follows: a common 24v mobile power supply is selected to electrify and heat the conductive heating layer, so that the temperature of the food packaging paper can be raised to 62.5 ℃, and the highest constant temperature of 87.5 ℃ can be reached under the condition of room temperature of 25 ℃.
Example 3
The conductive heating food packaging paper comprises packaging base paper, a conductive heating layer and a PLA (polylactic acid) film coating layer which are sequentially stacked from bottom to top, wherein the quantitative amount of the packaging paper is 40g/m 2, the resistance of the conductive heating layer is 200 ohms, the area of the conductive heating layer is 100cm 2, the quantitative amount of the PLA film coating layer is 10g/m 2, the conductive heating layer is made of a modified graphene/carbon nano tube/nano fiber conductive heating coating, the solid content of the modified graphene/carbon nano tube/nano cellulose conductive heating coating is 56.5%, and the modified graphene/carbon nano tube/nano cellulose conductive heating coating is composed of 1-naphthoic acid modified multilayer graphene, carbon nano tubes, oven dry nano Cellulose (CNF) and water in a mass ratio of 1: 0.2: 0.1: 1.
The specific preparation method of the conductive heating food packaging paper comprises the following steps:
(1) Preparation of packaging base paper
Mixing mixed wood pulp, AKD and cationic starch according to a mass ratio of 1: 0.03: 0.04, and then manufacturing food packaging base paper by using a single fourdrinier machine; wherein: the mixed wood pulp is prepared by mixing the following components in a mass ratio of 1: 4, the softwood pulp and the hardwood pulp are mixed and then are ground into pulp, the grinding concentration is controlled to be 4%, and the beating degree is controlled to be 60-degree SR.
(2) Preparation of the conductive heating layer
(a) Dissolving 1-naphthoic acid in anhydrous ethanol, and controlling the concentration of 1-naphthoic acid at 20 g/L. Then adding the multilayer graphene into the 1-naphthoic acid ethanol solution, stirring for 30min at room temperature under the condition of 500r/min, and filtering to obtain non-covalent bond modified multilayer graphene, namely the 1-naphthoic acid modified multilayer graphene; wherein: the mass ratio of the multilayer graphene to the 1-naphthoic acid is 1: 20.
(b) Fully pulping bleached hardwood pulp with the mass concentration of 0.5% to enable the pulping degree to reach 95 DEG SR, homogenizing the bleached wood pulp by using a homogenizer at the homogenizing pressure of 90MPa for 10 times of homogenizing circulation treatment to prepare nano-cellulose suspension, placing the nano-cellulose suspension in a freeze dryer, and freeze-drying for 36h at the temperature of-10 ℃ to obtain the oven-dried nano-cellulose.
(c) mixing the components in a mass ratio of 1: 0.2: 0.1: 1, mixing the 1-naphthoic acid modified multilayer graphene, the carbon nano tube, the oven-dried nano cellulose and water, and uniformly dispersing for 50min by using a common ultrasonic cleaning machine and a stirrer to prepare the modified graphene/carbon nano tube/nano cellulose conductive coating, wherein the solid content of the conductive coating is 56.5%.
2(3) Coating the modified graphene/carbon nano tube/nano cellulose conductive coating prepared in the step (2) on the food packaging base paper obtained in the step (1) by using a scraper coater, then freeze-drying the modified graphene/carbon nano tube/nano cellulose conductive coating in a freeze-drying oven at the temperature of-20 ℃ for 2 hours, drying the modified graphene/carbon nano tube/nano cellulose conductive coating to obtain a conductive heating layer, further performing PLA (polylactic acid) film coating on the surface of the conductive heating layer, continuously freeze-drying the conductive heating layer in the freeze-drying oven at the temperature of-20 ℃ for 2 hours, and finally cutting the conductive heating food packaging paper to obtain the conductive heating food packaging.
the conductive heating food packaging paper prepared in the embodiment is used as follows: a common 24v mobile power supply is selected to electrify and heat the conductive heating layer, so that the temperature of the food packaging paper can be increased to 31.25 ℃, and the highest constant temperature of 61.25 ℃ can be reached under the condition of normal temperature of 30 ℃.
Claims (10)
1. A conductive heating food packaging paper is characterized in that: the packaging base paper comprises packaging base paper, a conductive heating layer and a PLA (polylactic acid) spraying film layer which are sequentially stacked from bottom to top, wherein the conductive heating layer is made of modified graphene/carbon nano tube/nano cellulose conductive heating coating, and the thickness of the conductive heating layer is 5-50 micrometers.
2. The conductive heating food packaging paper as claimed in claim 1, wherein the resistance of the conductive heating layer is 20-200 Ω, and the area of the conductive heating layer is 100-500cm 2.
3. The conductive heating food packaging paper as claimed in claim 1, wherein the packaging paper has a basis weight of 40-100g/m 2, and the PLA PE film layer has a basis weight of 10-40g/m 2.
4. The conductive heating food wrapping paper of claim 1, wherein: the packaging base paper is prepared by mixing wood pulp, AKD and cationic starch according to a mass ratio of 1: 0.01-0.03: 0.01 to 0.04 percent of the raw materials are mixed and ground into pulp, the concentration of the ground pulp is controlled to be 4 to 6 percent, the beating degree is controlled to be 60 to 70 degrees SR, and the mixture is manufactured by a fourdrinier machine.
5. The conductive heating food wrapping paper of claim 1, wherein: the modified graphene/carbon nanotube/nano-cellulose conductive heating coating is prepared from the following raw materials in a mass ratio of 1: 0.05-0.2: 0.025-0.1: 1-10 of 1-naphthoic acid modified multilayer graphene, a carbon nano tube, oven-dried nano cellulose and water.
6. The conductive heating food wrapping paper of claim 5, wherein: the solid content of the conductive heating coating is preferably 40 to 60%.
7. The conductive heating food wrapping paper of claim 5, wherein: the 1-naphthoic acid modified multilayer graphene is prepared by the following method: dissolving 1-naphthoic acid in absolute ethyl alcohol according to a ratio to obtain a 1-naphthoic acid ethanol solution, then adding multilayer graphene into the 1-naphthoic acid ethanol solution, uniformly stirring at normal temperature, and filtering to obtain non-covalent bond modified multilayer graphene, namely the 1-naphthoic acid modified multilayer graphene; wherein: in the 1-naphthoic acid ethanol solution, the concentration of 1-naphthoic acid is 5-20g/L, and the mass ratio of the multilayer graphene to the 1-naphthoic acid is 1: 5-20.
8. The conductive heating food wrapping paper of claim 5, wherein: the oven-dried nano-cellulose is prepared by adopting a high-pressure homogenization method, and comprises the following specific steps: fully pulping bleached hardwood pulp or bleached softwood pulp with the mass concentration of 0.5-1% to enable the pulping degree to reach 80-95 DEG SR, then homogenizing the bleached wood pulp by using a homogenizer to obtain a nano-cellulose suspension, and finally freeze-drying the obtained nano-cellulose suspension to obtain the oven-dried nano-cellulose.
9. The conductive heating food wrapping paper of claim 8, wherein: the pressure of the homogenization treatment is 80-100MPa, and the times of the homogenization treatment are 10-20 times.
10. The conductive heating food wrapping paper of claim 1, wherein: and coating the modified graphene/carbon nano tube/nano cellulose conductive coating on the packaging base paper, drying, further performing PLA film spraying, drying, and finally cutting to obtain the conductive heating food packaging paper.
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| GB2620171A (en) * | 2022-06-30 | 2024-01-03 | Toraphene Ltd | Biodegradable packaging material, use and method for manufacturing thereof |
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