CN112482084A - Heat-resistant and waterproof paper packaging material and preparation process thereof - Google Patents
Heat-resistant and waterproof paper packaging material and preparation process thereof Download PDFInfo
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- CN112482084A CN112482084A CN202011283768.6A CN202011283768A CN112482084A CN 112482084 A CN112482084 A CN 112482084A CN 202011283768 A CN202011283768 A CN 202011283768A CN 112482084 A CN112482084 A CN 112482084A
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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
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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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
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/64—Inorganic compounds
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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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/826—Paper comprising more than one coating superposed two superposed coatings, the first applied being pigmented and the second applied being non-pigmented
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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
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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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Abstract
The invention discloses a heat-resistant and waterproof paper packaging material and a preparation process thereof. The paper packaging material takes corrugated paper, paperboard or other types of packaging paperboards as a core layer, a heat insulation layer is coated on the surface of the core layer, and a waterproof layer is further coated on the surface of the heat insulation layer. The heat-insulating layer is formed by coating a mixed solution of treated chopped glass fibers, nano ferroferric oxide, sodium oleate, epoxy resin, bisphenol A and a silane coupling agent, and the heat-resistant performance and strength of the paper packaging material are improved by utilizing the common rigidity and heat resistance of the nano ferroferric oxide, the epoxy resin and the glass fibers; the waterproof layer is formed by coating mixed liquid obtained by processing copolymer containing fluorine acrylate and acrylate, cross-linking agent and starch. The paper packaging material prepared by the method has good heat resistance, waterproofness and high strength.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a heat-resistant and waterproof paper packaging material and a preparation process thereof.
Background
Paper packaging materials can be divided into two categories, packaging paper and paperboard; the paper packaging material mainly takes cellulose and starch as main raw materials, and is more environment-friendly compared with a plastic packaging material; the current concept of green sustainable development gradually permeates daily life, the requirement of people on green environmental protection is gradually improved, and the paper packaging material becomes a packaging material with wide prospect, so that the development of technical personnel is hot.
The main chemical components of the paper belong to polysaccharide, and the polysaccharide surface has more hydrophilic hydroxyl groups, so that the paper packaging material is easy to absorb water, and the mechanical property of the paper board is reduced after water absorption; the mechanical property reduction brings troubles, such as insufficient bearing capacity, local deformation of packaging boxes and the like, and the exposed packaged articles are easy to damage. Therefore, the waterproof property of paper packaging materials has become a focus of research in the field. At present, two methods are mainly used for improving the waterproof performance of paper materials; 1. the paper material is adhered with waterproof materials such as plastic resin and the like, the surface of the paper material treated by the method has good waterproof performance, but is easy to deform under the action of local external force, and the manufacturing cost is higher. 2. The surface of the paper packaging material is coated with the hydrophobic agent, and the paper packaging material coated by the method has good waterproof performance, simplified processing procedures and easy operation.
In the patent "preparation method of CN201611063977.3 super-hydrophobic paper packaging material", a layer of hydrophobic agent is coated on paper material, so that the paper packaging material has good waterproof performance, but the main components of the hydrophobic agent are fluorine modified acrylic resin, starch and water; the water repellent agent contains a certain amount of water, the paper material absorbs water at the initial coating stage to reduce the mechanical property of the interface between the coating layer and the paper material, and the waterproof packaging material is not heat-resistant and cannot be widely applied.
Disclosure of Invention
The invention aims to provide a heat-resistant and waterproof paper packaging material and a preparation process thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a heat-resistant and waterproof paper packaging material comprises a core layer and a waterproof layer; and a heat insulation layer is arranged between the core layer and the waterproof layer.
Further, the heat insulation layer is prepared from the following raw materials, by weight, 15-20 parts of chopped glass fiber, 60-70 parts of modified epoxy resin and 23-27 parts of silane coupling agent.
Further, the waterproof layer is prepared from 47-53 parts by weight of fluorine-containing copolymer, 15-19 parts by weight of cross-linking agent and 35-40 parts by weight of starch.
Further, the modified epoxy resin is mainly prepared by reacting nano ferroferric oxide, sodium oleate, epoxy resin and bisphenol A.
Further, the silane coupling agent is KH-550; the core layer is corrugated paper, paperboard or other packaging paperboard.
A preparation process of a heat-resistant and waterproof paper packaging material comprises the following steps;
(1) preparing modified epoxy resin;
(2) preparing a waterproof layer coating liquid;
(3) taking a core material, wiping the surface of the core material, mixing the chopped glass fiber and the modified epoxy resin, uniformly coating the mixture on the surface of the core material, and naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, and naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Further, a preparation process of the heat-resistant and waterproof paper packaging material comprises the following steps;
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed under a nitrogen seal condition, standing, adding an acetone solution, separating to remove a liquid phase, washing a solid phase with an ethanol solution, and naturally drying to obtain modified nano ferroferric oxide; dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, and heating to 125-135 ℃ for reaction to prepare modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 5-8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 100-105 ℃, reacting, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) taking a core material, wiping the surface of the core material, mixing the chopped glass fiber and the modified epoxy resin, uniformly coating the mixture on the surface of the core material, flattening, and naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, and naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Further, a preparation process of the heat-resistant and waterproof paper packaging material comprises the following steps;
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed of 1200r/min under a nitrogen seal condition, stirring for 40-60min at the speed of 1000-;
dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, heating to 125-160 ℃ for reaction for 2-3h, heating to 150-160 ℃ for vacuum dehydration for 20-40min, and thus obtaining modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 5-8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 100-105 ℃, reacting for 1-2h, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) taking a core material, wherein the core material is a metal,wiping the surface of the core material, soaking the chopped glass fiber in a silane coupling agent at the temperature of 105-110 ℃, soaking for 6-8h, naturally drying, adding modified epoxy resin, mixing and stirring, uniformly coating the mixture on the surface of the core material, flattening, wherein the coating pressure is 0.1-0.5 MPa, and the coating weight is 10-15 g/m2Naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, wherein the coating pressure is 0.1-0.5 MPa, and the coating weight is 30-40 g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Further, the fluorine-containing acrylate monomer in the step (2) is one or more of trifluoroethyl methacrylate, trifluoroethyl acrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and tridecafluoroctyl methacrylate.
Further, the adding amount of the solid potassium hydroxide in the step (1) is 0.1-0.3% of the mass of the epoxy resin.
Compared with the prior art, the invention has the following beneficial effects: the invention prepares a heat-resistant and waterproof paper packaging material, wherein a heat-insulating layer and a waterproof layer are coated on the surface of the paper packaging material, and the heat-insulating layer mainly adopts rigid filler nano ferroferric oxide and epoxy resin; the nano ferroferric oxide is a rigid inorganic particle, the strength and the heat resistance of the packaging material can be improved, the benzene ring structure of the epoxy resin endows the epoxy resin with rigidity and heat resistance, but the heat resistance is weaker in total; according to the scheme, oleic acid on the surface of the nano ferroferric oxide is modified, the nano ferroferric oxide with oleic acid groups is bonded with hydroxyl on the surface of the epoxy resin to form the modified epoxy resin, and the heat resistance and the rigidity of the modified epoxy resin are greatly improved. The chopped glass fiber can form interlaced ribs on the surface of the paper material, so that the strength of the packaging material is improved. Meanwhile, the glass fiber has excellent heat resistance, and the glass fiber is directly covered on the surface of the paper core material, so that larger gaps exist, the adhesion property with the surface of the paper material is poor, and the application effect is not ideal; according to the scheme, the silane coupling agent KH-550 is adopted to obviously improve the wettability of the glass fiber, the surface free energy and the wetting activation energy of the glass fiber after being treated by the KH-550 are reduced, so that the glass fiber is easier to be wetted by the epoxy resin, the compatibility and the interface cohesiveness of the modified epoxy resin and the glass fiber are enhanced, the porosity between the epoxy resin and the glass fiber is reduced, and the heat-insulating layer is firmly attached to the surface of the paper core material to prevent water from entering the heat-insulating layer. The surface of the heat insulation layer is coated with a waterproof layer, the waterproof layer is coated by adopting a fluorine-containing copolymer, starch and a cross-linking agent in a mixing manner, and the fluorine-containing copolymer has excellent chemical resistance and low surface energy and is endowed with excellent hydrophobic property. The paper packaging material prepared by the method has good heat resistance, waterproofness and high strength.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A heat-resistant and waterproof paper packaging material comprises a core layer and a waterproof layer, wherein a heat insulation layer is arranged between the core layer and the waterproof layer. The heat insulation layer is prepared from the following raw materials, by weight, 15 parts of chopped glass fiber, 60 parts of modified epoxy resin and 23 parts of silane coupling agent; the waterproof layer is prepared from 47 parts by weight of fluorine-containing copolymer, 15 parts by weight of cross-linking agent and 35 parts by weight of starch.
The paper packaging material is prepared by the following specific steps:
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed under a nitrogen seal condition, wherein the stirring speed is 1000r/min, the stirring time is 40min, standing, adding an acetone solution, separating to remove a liquid phase, washing the solid phase with an ethanol solution, and naturally drying to obtain modified nano ferroferric oxide;
dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, heating to 125 ℃, keeping the pressure at 0.2Mpa, reacting for 2 hours, heating to 150 ℃, and performing vacuum dehydration for 20min to obtain modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 5 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 100 ℃, reacting for 1h, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) cleaning the surface of a core material, soaking the chopped glass fiber in a silane coupling agent at 105 ℃ for 6h, naturally drying, adding modified epoxy resin, mixing and stirring, uniformly coating the surface of the core material at the coating pressure of 0.1MPa and the coating weight of 10g/m2Naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating solution on the surface of the heat insulation layer, wherein the coating pressure is 0.1MPa, and the coating weight is 30g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Example 2
A heat-resistant and waterproof paper packaging material comprises a core layer and a waterproof layer, wherein a heat insulation layer is arranged between the core layer and the waterproof layer. The heat insulation layer is prepared from the following raw materials, by weight, 17 parts of chopped glass fiber, 63 parts of modified epoxy resin and 25 parts of silane coupling agent; the waterproof layer is prepared from 50 parts by weight of fluorine-containing copolymer, 17 parts by weight of cross-linking agent and 36 parts by weight of starch.
The paper packaging material is prepared by the following specific steps:
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed of 1050r/min under a nitrogen seal condition for 46min, standing, adding an acetone solution, separating to remove a liquid phase, washing the solid phase with an ethanol solution, and naturally drying to obtain modified nano ferroferric oxide;
dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, heating to 130 ℃, keeping the pressure at 0.25Mpa, reacting for 2.5h, heating to 155 ℃, and performing vacuum dehydration for 25min to obtain modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 6 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 103 ℃, reacting for 1.5h, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) cleaning the surface of a core material, soaking the chopped glass fiber in a silane coupling agent at 107 ℃ for 7h, naturally drying, adding modified epoxy resin, mixing and stirring, uniformly coating the surface of the core material at the coating pressure of 0.3MPa and the coating weight of 12g/m2Naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating solution on the surface of the heat insulation layer, wherein the coating pressure is 0.3MPa, and the coating weight is 36g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Example 3
A heat-resistant and waterproof paper packaging material comprises a core layer and a waterproof layer, wherein a heat insulation layer is arranged between the core layer and the waterproof layer. The heat insulation layer is prepared from the following raw materials, by weight, 20 parts of chopped glass fiber, 70 parts of modified epoxy resin and 27 parts of silane coupling agent; the waterproof layer is prepared from 53 parts by weight of fluorine-containing copolymer, 19 parts by weight of cross-linking agent and 40 parts by weight of starch.
The paper packaging material is prepared by the following specific steps:
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed of 1200r/min under a nitrogen seal condition for 60min, standing, adding an acetone solution, separating to remove a liquid phase, washing the solid phase with an ethanol solution, and naturally drying to obtain modified nano ferroferric oxide;
dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, heating to 135 ℃, keeping the pressure at 0.3Mpa, reacting for 3 hours, heating to 160 ℃, and performing vacuum dehydration for 40min to obtain modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 105 ℃, reacting for 2 hours, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) cleaning the surface of a core material, soaking the chopped glass fiber in a silane coupling agent at 110 ℃ for 8h, naturally drying, adding modified epoxy resin, mixing and stirring, uniformly coating the surface of the core material at the coating pressure of 0.5MPa and the coating weight of 15g/m2Naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating solution on the surface of the heat insulation layer, wherein the coating pressure is 0.5MPa, and the coating weight is 40g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Comparative example 1
A heat-resistant and waterproof paper packaging material comprises a core layer and a waterproof layer, wherein a heat insulation layer is arranged between the core layer and the waterproof layer. The heat insulation layer is prepared from the following raw materials, by weight, 70 parts of modified epoxy resin and 27 parts of silane coupling agent; the waterproof layer is prepared from 53 parts by weight of fluorine-containing copolymer, 19 parts by weight of cross-linking agent and 40 parts by weight of starch.
The paper packaging material is prepared by the following specific steps:
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding epoxy resin, dispersing at high speed, separating to remove a liquid phase, and naturally drying to obtain modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 105 ℃, reacting for 2 hours, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) wiping the surface of a core material, mixing the modified epoxy resin, and uniformly coating the surface of the core material with the coating pressure of 0.5MPa and the coating weight of 15g/m2Naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating solution on the surface of the heat insulation layer, wherein the coating pressure is 0.5MPa, and the coating weight is 40g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Comparative example 2
A heat-resistant and waterproof paper packaging material comprises a core layer and a waterproof layer, wherein a heat insulation layer is arranged between the core layer and the waterproof layer. The heat insulation layer is prepared from the following raw materials, by weight, 20 parts of chopped glass fiber, 70 parts of epoxy resin and 27 parts of silane coupling agent; the waterproof layer is prepared from 53 parts by weight of fluorine-containing copolymer, 19 parts by weight of cross-linking agent and 40 parts by weight of starch.
The paper packaging material is prepared by the following specific steps:
(1) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 105 ℃, reacting for 2 hours, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(2) cleaning the surface of a core material, soaking the chopped glass fiber in a silane coupling agent at 110 ℃ for 8h, naturally drying, adding epoxy resin, mixing and stirring, uniformly coating the surface of the core material under the coating pressure of 0.5MPa and the coating weight of 15g/m2Naturally drying to form a heat insulation layer;
(3) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, wherein the coating pressure is 0.5MPa and the coating weight is40g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Comparative example 3
The heat-resistant waterproof paper packaging material comprises a core layer and a waterproof layer, wherein the waterproof layer is prepared from 53 parts by weight of fluorine-containing copolymer, 19 parts by weight of cross-linking agent and 40 parts by weight of starch.
The paper packaging material is prepared by the following specific steps:
(1) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 105 ℃, reacting for 2 hours, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(2) taking a core material, wiping the surface of the core material clean, uniformly coating a waterproof layer coating liquid, wherein the coating pressure is 0.5MPa, and the coating weight is 40g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
Analysis of test data
The core layers used in examples 1 to 3 and comparative examples 1 to 3 are all flat paperboards, and the areas, thicknesses and materials of the paperboards are the same. The paper packaging materials prepared in examples 1-3 and comparative examples 1-3 are subjected to hydrophobic property detection and strength detection, and the detection results are shown in table 1;
| contact angle of waterproof layer and water | Tensile strength mpa | Transverse tear Strength mN | |
| Example 1 | 155.7° | 15 | 750 |
| Example 2 | 158.5° | 15 | 775 |
| Example 3 | 161.2° | 15 | 800 |
| Comparative example 1 | 156.7° | 10 | 715 |
| Comparative example 2 | 1555° | 12 | 725 |
| Comparative example 3 | 157.3° | 9 | 447 |
TABLE 1
The paper packaging materials prepared in examples 1-3 and comparative examples 1-3 were subjected to heat resistance evaluation, and the flat board packaging materials prepared in the above examples and comparative examples were taken, 3 sheets were each used for each group, heat-sealed and heat-sealed under conditions of 180 ℃ x 0.2MPa x 6sec, and the deformation of the surface and the coating thinness of the flat board packaging material of each group were observed, and the results are shown in table 2; taking 3 pieces of the flat paperboard packaging materials prepared in the examples 1-3 and the comparative examples 1-3, putting the 3 pieces of the flat paperboard packaging materials into a balanced constant temperature and humidity box with 60 ℃ and 50% RH for continuous 48 hours, taking out the flat paperboard packaging materials, and observing the deformation and the coating thinness of the surfaces of the flat paperboard packaging materials of each group, wherein the statistics of the results are shown in Table 2;
TABLE 2
As can be seen from the data in Table 1, the contact angles between the waterproof layers of the paper packaging materials prepared in examples 1-3 and water reach 150 degrees, which indicates that the packaging materials prepared by the invention have good hydrophobic property; the paper packaging materials prepared in comparative examples 1 to 3 had higher water resistance, but the strength was weaker than that of example 3; when the thermal insulation layer is prepared in the comparative example 1, nano ferroferric oxide and epoxy resin are mixed and directly coated without adding glass fiber, so that the tensile strength and the tear strength of the prepared paper packaging material are lower than those of the paper packaging material in the example 3; when the thermal insulation layer is prepared according to the comparative example 2, the glass fiber is not treated and is mixed with the epoxy resin for coating to form the thermal insulation layer, and the strength performance of the finally prepared paper packaging material is reduced compared with that of the paper packaging material prepared according to the example 3; the comparative example 3 is not provided with the heat insulation layer, the waterproof performance is good, but the tearing strength and the tensile strength of the waterproof layer are greatly reduced compared with those of the example 3; the data show that the paper packaging material prepared by the invention has high waterproof performance and good strength performance.
As is clear from the data in Table 2, in the flat board packaging materials prepared in examples 1 to 3, neither surface deformation shrinkage nor coating peeling occurred in the heat sealing and constant temperature and humidity environment of 60 ℃ X50% RH; the flat paperboard packaging materials of comparative examples 1 to 3 exhibited different degrees of coating peeling and surface deformation, and thus, it was also demonstrated that the flat paperboard packaging materials prepared by the present invention had better heat resistance.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A heat-resistant, waterproof paper packaging material, characterized by; comprises a core layer and a waterproof layer; and a heat insulation layer is arranged between the core layer and the waterproof layer.
2. A heat-resistant, water-resistant paper packaging material as claimed in claim 1, characterized in that: the heat insulation layer is prepared from the following raw materials, by weight, 15-20 parts of chopped glass fibers, 60-70 parts of modified epoxy resin and 23-27 parts of silane coupling agent.
3. A heat-resistant, water-resistant paper packaging material as claimed in claim 1, characterized in that: the waterproof layer is prepared from the following raw materials, by weight, 47-53 parts of fluorine-containing copolymer, 15-19 parts of cross-linking agent and 35-40 parts of starch.
4. A heat-resistant, water-resistant paper packaging material as claimed in claim 2, characterized in that: the modified epoxy resin is mainly prepared by the reaction of nano ferroferric oxide, sodium oleate, epoxy resin and bisphenol A.
5. A heat-resistant, water-resistant paper packaging material as claimed in claim 1, characterized in that: the silane coupling agent is KH-550; the core layer is corrugated paper or paperboard.
6. A preparation process of a heat-resistant and waterproof paper packaging material is characterized by comprising the following steps: comprises the following steps;
(1) preparing modified epoxy resin;
(2) preparing a waterproof layer coating liquid;
(3) taking a core material, wiping the surface of the core material, mixing the chopped glass fiber and the modified epoxy resin, uniformly coating the mixture on the surface of the core material, and naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, and naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
7. The process for preparing a heat-resistant, water-resistant paper packaging material according to claim 6, wherein: comprises the following steps;
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed under a nitrogen seal condition, standing, adding an acetone solution, separating to remove a liquid phase, washing a solid phase with an ethanol solution, and naturally drying to obtain modified nano ferroferric oxide; dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, and heating to 125-135 ℃ for reaction to prepare modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 5-8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 100-105 ℃, reacting, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) taking a core material, and wiping the surface of the core material clean; mixing the chopped glass fiber and the modified epoxy resin, uniformly coating the mixture on the surface of the core material, flattening, and naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, and naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
8. The process for preparing a heat-resistant, water-resistant paper packaging material according to claim 7, wherein: comprises the following steps;
(1) preparing modified epoxy resin; dispersing nano ferroferric oxide in water, adding a sodium oleate solution, stirring at a high speed of 1200r/min under a nitrogen seal condition, stirring for 40-60min at the speed of 1000-;
dissolving epoxy resin and bisphenol A in n-butyl alcohol, performing nitrogen sealing protection, adding modified nano ferroferric oxide, mixing and stirring, adding solid potassium hydroxide, stirring, heating to 125-160 ℃ for reaction for 2-3h, heating to 150-160 ℃ for vacuum dehydration for 20-40min, and thus obtaining modified epoxy resin;
(2) preparation of a fluorine-containing copolymer: dissolving a fluorine-containing acrylate monomer and methyl acrylate in a solvent, carrying out nitrogen sealing protection, cooling to 5-8 ℃, adding dimethyl azodiisobutyrate, stirring, heating to 100-105 ℃, reacting for 1-2h, and evaporating the solvent to obtain a fluorine-containing copolymer; mixing fluorine-containing copolymer, starch and a cross-linking agent to obtain a waterproof layer coating liquid;
(3) taking a core material, wiping the surface of the core material, soaking the chopped glass fiber in a silane coupling agent at the temperature of 105-110 ℃, soaking for 6-8h, naturally drying, adding modified epoxy resin, mixing and stirring, uniformly coating the surface of the core material, flattening, wherein the coating pressure is 0.1-0.5 MPa, and the coating weight is 10-15 g/m2Naturally drying to form a heat insulation layer;
(4) uniformly coating a waterproof layer coating liquid on the surface of the heat insulation layer, wherein the coating pressure is 0.1-0.5 MPa, and the coating weight is 30-40 g/m2Naturally drying to form a waterproof layer; and pressing and sanding the waterproof layer to obtain a finished product of the paper packaging material.
9. The process for preparing a heat-resistant, water-resistant paper packaging material according to claim 8, wherein: the fluorine-containing acrylate monomer in the step (2) is one or more of trifluoroethyl methacrylate, trifluoroethyl acrylate, hexafluorobutyl methacrylate, hexafluorobutyl acrylate, dodecafluoroheptyl methacrylate, dodecafluoroheptyl acrylate and tridecafluoroctyl methacrylate.
10. The process for preparing a heat-resistant, water-resistant paper packaging material according to claim 8, wherein: the adding amount of the solid potassium hydroxide in the step (1) is 0.1-0.3% of the mass of the epoxy resin.
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| CN116200969A (en) * | 2022-12-20 | 2023-06-02 | 郑州华英包装股份有限公司 | Packaging material with good heat insulation performance and preparation method thereof |
| CN116496559A (en) * | 2022-01-19 | 2023-07-28 | 江苏飞强包装材料有限公司 | Environment-friendly packaging material and preparation method thereof |
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| CN106758527A (en) * | 2016-11-28 | 2017-05-31 | 浙江大胜达包装有限公司 | The preparation method of super-hydrophobic paper wrapper |
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| CN112482084B (en) | 2022-04-22 |
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