CN117603484A - Heat-sealable plastic-free paper environment-friendly coating - Google Patents
Heat-sealable plastic-free paper environment-friendly coating Download PDFInfo
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- CN117603484A CN117603484A CN202311472450.6A CN202311472450A CN117603484A CN 117603484 A CN117603484 A CN 117603484A CN 202311472450 A CN202311472450 A CN 202311472450A CN 117603484 A CN117603484 A CN 117603484A
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- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 claims abstract description 37
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 13
- 229920013724 bio-based polymer Polymers 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000004382 Amylase Substances 0.000 claims description 11
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 8
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- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
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- 235000010413 sodium alginate Nutrition 0.000 claims description 6
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- 229960002681 calcium alginate Drugs 0.000 claims description 5
- OKHHGHGGPDJQHR-YMOPUZKJSA-L calcium;(2s,3s,4s,5s,6r)-6-[(2r,3s,4r,5s,6r)-2-carboxy-6-[(2r,3s,4r,5s,6r)-2-carboxylato-4,5,6-trihydroxyoxan-3-yl]oxy-4,5-dihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate Chemical compound [Ca+2].O[C@@H]1[C@H](O)[C@H](O)O[C@@H](C([O-])=O)[C@H]1O[C@H]1[C@@H](O)[C@@H](O)[C@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@H](O2)C([O-])=O)O)[C@H](C(O)=O)O1 OKHHGHGGPDJQHR-YMOPUZKJSA-L 0.000 claims description 5
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D103/00—Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
- C09D103/02—Starch; Degradation products thereof, e.g. dextrin
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2203/00—Other substrates
- B05D2203/22—Paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2252/00—Sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a heat-sealable plastic-free paper environment-friendly coating, and relates to the technical field of plastic-free coated paper. According to the invention, through the arrangement on the coating ingredients, the complex reaction is generated in the solution by changing the coating ingredients and mixing the alginate, the algae colloid and the nano oxide, so that the performance of the solution is improved, the mechanical property of the coating is improved, the water and oil resistance of the coating is improved by using the alginate, the using effect of the plastic-free paper environment-friendly coating is further improved, the mechanical property of the plastic-free paper environment-friendly coating is realized, the plastic-free paper environment-friendly coating can be applied to positions needing to be moved, the coatings are ensured not to fall off easily in the moving process, the mutual viscosity between the coatings is ensured, and the situation that part of the coatings are separated from the plastic-free paper can be still limited at the current position under the action of the surrounding coatings, so that the falling situation is avoided, and the use of the plastic-free paper is ensured.
Description
Technical Field
The invention relates to the technical field of plastic-free coated paper, in particular to a heat-sealable plastic-free paper environment-friendly coating.
Background
The plastic-free paper (also called biodegradable paper) is a novel environment-friendly material, is mainly used for replacing traditional plastic bags, plastic packages and the like, has the characteristics of biodegradability, innocuity, harmlessness, environmental protection and the like compared with traditional plastic products, can effectively reduce the pollution of plastic garbage to the environment, and is a treatment for enhancing the performance and the function of the plastic-free paper, and the coating can provide additional protection and increase the water resistance, oil resistance, antibacterial property and the like of the paper.
In the use process of the plastic-free coated paper, the coating and the plastic-free paper are produced respectively, and after the production, the plastic-free coated paper is manufactured by feeding on plastic-free, so that the use range of the plastic-free coated paper is limited, and for the use of some movable parts, such as disposable gloves, the adhesion between the plastic-free paper and the coating is reduced due to the long-time movement of the finger position in the use process, so that the possibility that the coating falls off from the plastic-free paper occurs, and the plastic-free coated paper is poor in use of the movable parts.
Disclosure of Invention
The invention aims to provide a heat-sealable plastic-free paper environment-friendly coating for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a heat sealable plastic free paper environmental protection coating, wherein the formulation of the heat sealable plastic free paper environmental protection coating comprises:
the weight ratio of the components is as follows: 20-30wt% of natural fiber, 10-16wt% of nano oxide, 10-20wt% of starch, 3-8wt% of water-based adhesive, 25-35wt% of bio-based polymer, 3-5wt% of polyhydroxyalkanoate, 1-3wt% of viscose, 5-7wt% of polycaprolactone, 2-3wt% of heat-shrinkable resin, 3-5wt% of alginate, 0.2-0.4wt% of epoxide crosslinking agent, 0.5-0.8wt% of sodium carbonate, 1-2wt% of algae colloid and 0.8-1.3wt% of polysaccharase.
Still further, the nano-oxide includes nano-silica and nano-alumina, and a weight ratio between the nano-silica and the nano-alumina is (0.2 to 0.3): 1, the polysaccharase comprises amylase and cellulase, and the weight ratio between the amylase and the cellulase is 1: (0.8-1.3), wherein the alginate is one or a mixture of sodium alginate and calcium alginate, and the algae colloid is one or a mixture of diatomite colloid and brown algae colloid.
A method for preparing a heat-sealable plastic-free paper environmental protection coating, comprising the following steps:
s01: manufacturing an aqueous solvent;
s02: removing impurities from the natural fibers and performing fibrosis treatment to enable the natural fibers to pass through sieve holes to obtain a cellulose base material;
s03: mixing the bio-based polymer, the polyhydroxyalkanoate and the epoxide crosslinking agent through a mixer to form a mixture, and refining the mixture to enable the mixture to pass through sieve holes;
s04: primarily mixing nano oxide, a water-based adhesive, viscose, alginate, algae colloid and an epoxide crosslinking agent to form a nano oxide colloid solution;
s05: heating the water solvent to keep the water temperature between 40 and 50 ℃, dispersing starch in a proper amount of water solvent, and uniformly stirring to form a starch solution;
s06: adding polysaccharase into the solution in S05, continuously stirring, continuously adding sodium carbonate at 30-40 ℃ for 2-3 hours, and neutralizing the solution to enable the pH value of the solution to be 7.0-7.8, thus obtaining a mixed solution of modified starch and starch;
s07: the cellulose base material is immersed in the nano oxide colloid solution and stirred;
s08: pouring the mixture into the mixed solution in the step S06, heating and stirring the mixed solution, ensuring that the temperature of the solvent is between 70 and 80 ℃ for 1.5 to 2 hours, wherein a drainage device is arranged for avoiding steam generated during heating and backflow of the steam into the solvent until the solvent forms a viscous state;
s09: mixing and stirring the nano oxide colloid solution and the viscosity of S07, adding alginate, ensuring that the temperature of a container is kept between 50 and 60 ℃ during stirring, and stirring and applying for 3 to 4 hours to prepare a coating material;
s10: the temperature of the coating material passes through the sieve holes at 60-70 ℃ in a hot extrusion mode, and air in the coating material is removed by a degassing method;
s11: and (3) transferring the coating material into a hot press, wherein the treatment temperature is 150-180 ℃ and the duration is 25-35 min, so that the finished heat-sealable plastic-free paper environment-friendly coating is obtained.
Further, the ratio of the total weight of the aqueous solvent to the coating material is 1: (0.64-0.82), wherein the water solvent adopts a mixture of water and glycerin, and the weight ratio of the water to the glycerin is 1: (0.3-0.5), wherein the weight ratio of the epoxide crosslinking agent in S03 to the epoxide crosslinking agent in S04 is 3:2, deionized water is adopted as water.
Still further, the degassing method in S10 includes: and (3) moving the coating material into a vacuumizing device, and operating the vacuumizing device to keep the vacuum state for 30-50 min, so as to remove air in the coating material.
Still further, the degassing method in S10 includes: the coating material is moved to a sealed vibration container, vibrated by the vibration container, and heated so that the coating material reaches a boiling point, thereby removing air from the coating material.
Still further, the method of primary mixing in S04 includes: mixing and stirring the nano oxide, the water-based adhesive, the mucilage glue, the alginate and the algae colloid, promoting the mixing by an ultrasonic generator for 1-1.5 hours, then adding the epoxide crosslinking agent, continuously stirring, and keeping the temperature of the solution at 70-80 ℃ for 2-2.5 hours.
Still further, the method of primary mixing in S04 includes: mixing and stirring the nano oxide and the algae colloid, controlling the temperature to be 20-30 ℃ for 1-2 hours, heating and drying the mixture for 20-30 minutes at the drying temperature of 70-80 ℃, adding the viscose, the alginate and the epoxide crosslinking agent, and continuously stirring to ensure that the temperature of the mixture is 70-90 ℃ for 2-2.5 hours.
The feeding method of the heat-sealable plastic-free paper environment-friendly coating adopts the plastic-free paper environment-friendly coating prepared by the preparation method of the heat-sealable plastic-free paper environment-friendly coating, and the method comprises the following steps:
step one: the surface of the plastic-free paper is treated, the surface of the plastic-free paper is treated through a soft brush wheel, the pressure applied by the soft brush wheel to the surface of the plastic-free paper is 0.1-0.15MPa, the soft brush wheel rotates, the plastic-free paper moves, and the difference between the linear speed of the outermost wall of the soft brush wheel and the moving speed of the plastic-free paper is 0.6-1 m/min;
step two: spraying a cationic surfactant on the surface of the plastic-free paper;
step three: pouring the coating material into a coating machine, ensuring the temperature of the coating material to be 70-80 ℃, moving the plastic-free paper subjected to the first step into the coating machine, and coating the surface of the plastic-free paper through the coating machine;
step four: spraying a solution on the surface of the coating, wherein the solution is a mixture of snow pear acid, an antibacterial mildew inhibitor, epoxy resin and starch aqueous solution;
step five: the plastic-free paper coating is dried.
Further, the weight ratio of the snow pear acid, the antibacterial mildew preventive, the epoxy resin solvent and the starch aqueous solution is (5-10): (10-12): (12-20): 100, wherein in the third step, the ratio of starch to water gravity in the starch aqueous solution is (1-2): 100, in the first step, the pressure applied by the soft brush wheel to the surface of the plastic-free paper and the thickness of the plastic-free paper are positively correlated.
Compared with the prior art, the invention has the beneficial effects that:
the heat-sealable plastic-free paper environment-friendly coating is characterized in that the coating ingredients are changed, alginate, algae colloid and nano oxide are used, and the algae colloid and the nano oxide are mixed, so that a complexing reaction is generated in the solution, the performance of the solution is improved, the mechanical property of the coating is improved, the waterproof and oil-proof performances of the coating are improved due to the use of the alginate, the using effect of the plastic-free paper environment-friendly coating is further improved, the mechanical property of the plastic-free paper environment-friendly coating is realized, the plastic-free paper can be applied to positions needing to be moved, the coating is ensured not to fall off easily in the moving process, the using effect of the plastic-free coated paper is improved, the mutual viscosity between the coatings is improved, the situation that partial coatings are separated from the plastic-free paper is limited at the current position under the action of the surrounding coating, the falling situation is avoided, and the use of the plastic-free coated paper is ensured.
Meanwhile, through the arrangement on the preparation method of the coating, different primary mixing modes are selected in primary mixing, so that the coating has outstanding properties, and the nano-oxide and the algae colloid are subjected to complexation reaction during mixing and stirring, so that the mechanical properties of the coating are enhanced, or the nano-oxide, the aqueous adhesive, the viscose, the alginate and the algae colloid are firstly mixed and stirred, the complexation reaction is reduced, but the formation of subsequent crosslinking reaction is facilitated, and the wear resistance of the coating is increased.
In the feeding process, the surface of the plastic-free paper is treated through the hairbrush, and meanwhile, the cationic surfactant is sprayed on the surface of the plastic-free paper, so that fine wool is formed on the surface of the plastic-free paper, stable adhesion between the plastic-free paper and the coating is realized through the fine hairbrush, and the use of the cationic surfactant enables ions in the coating and the cationic surfactant to form adsorption, so that the adhesion between the coating and the plastic-free paper is ensured, and the situation that the coating is separated due to long-time movement of the plastic-free paper is reduced.
In addition, when alginate is used, alginate can interact with water molecules to form alginic acid solution with a certain concentration, and at this time, large molecular clusters, namely alginate colloid, are formed between alginic acid molecules through electrostatic attraction and hydrogen bond interaction, and the alginate colloid can endow the coating with good adhesiveness and gelation, so that the structural stability and durability of the coating are further improved.
Drawings
FIG. 1 is a flow chart of the preparation of the plastic-free paper environmental protection coating of the invention;
FIG. 2 is a graph of the burst strength of each plastic-free coated paper in the experiments of the present invention;
FIG. 3 is a graph of the longitudinal tear strength of each plastic-free coated paper in the experiments of the present invention;
FIG. 4 is a graph of the elongation of each of the plastic-free coated papers in the experiments of the present invention;
FIG. 5 is a graph of the oil repellency of various plastic-free coated papers in an experiment of the invention;
FIG. 6 is a graph of the water resistance of each plastic-free coated paper in the experiments of the present invention;
FIG. 7 is a graph of heat seal strength for each plastic-free coated paper in an experiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 7, the present invention provides a technical solution: a heat sealable plastic free paper environmental protection coating, wherein the formulation of the heat sealable plastic free paper environmental protection coating comprises:
the weight ratio of the components is as follows: 20-30wt% of natural fiber, 10-16wt% of nano oxide, 10-20wt% of starch, 3-8wt% of water-based adhesive, 25-35wt% of bio-based polymer, 3-5wt% of polyhydroxyalkanoate, 1-3wt% of viscose, 5-7wt% of polycaprolactone, 2-3wt% of heat-shrinkable resin, 3-5wt% of alginate, 0.2-0.4wt% of epoxide crosslinking agent, 0.5-0.8wt% of sodium carbonate, 1-2wt% of algae colloid and 0.8-1.3wt% of polysaccharase.
The nano oxide comprises nano silicon oxide and nano aluminum oxide, and the weight ratio of the nano silicon oxide to the nano aluminum oxide is (0.2-0.3): 1, polysaccharase comprises amylase and cellulase, and the weight ratio between the amylase and the cellulase is 1: (0.8-1.3), wherein the alginate is one or a mixture of sodium alginate and calcium alginate, and the algae colloid is one or a mixture of diatomite colloid and brown algae colloid.
The preparation method of the heat-sealable plastic-free paper environment-friendly coating comprises the following steps:
s01: manufacturing an aqueous solvent;
s02: removing impurities from the natural fibers and performing fibrosis treatment to enable the natural fibers to pass through sieve holes to obtain a cellulose base material;
s03: mixing the bio-based polymer, the polyhydroxyalkanoate and the epoxide crosslinking agent through a mixer to form a mixture, and refining the mixture to enable the mixture to pass through sieve holes;
s04: primarily mixing nano oxide, a water-based adhesive, viscose, alginate, algae colloid and an epoxide crosslinking agent to form a nano oxide colloid solution;
s05: heating the water solvent to keep the water temperature between 40 and 50 ℃, dispersing starch in a proper amount of water solvent, and uniformly stirring to form a starch solution;
s06: adding polysaccharase into the solution in S05, continuously stirring, continuously adding sodium carbonate at 30-40 ℃ for 2-3 hours, and neutralizing the solution to enable the pH value of the solution to be 7.0-7.8, thus obtaining a mixed solution of modified starch and starch;
s07: the cellulose base material is immersed in the nano oxide colloid solution and stirred;
s08: pouring the mixture into the mixed solution in the step S06, heating and stirring the mixed solution, ensuring that the temperature of the solvent is between 70 and 80 ℃ for 1.5 to 2 hours, wherein a drainage device is arranged for avoiding steam generated during heating and backflow of the steam into the solvent until the solvent forms a viscous state;
s09: mixing and stirring the nano oxide colloid solution and the viscosity of S07, adding alginate, ensuring that the temperature of a container is kept between 50 and 60 ℃ during stirring, and stirring and applying for 3 to 4 hours to prepare a coating material;
s10: the temperature of the coating material passes through the sieve holes at 60-70 ℃ in a hot extrusion mode, and air in the coating material is removed by a degassing method;
s11: and (3) transferring the coating material into a hot press, wherein the treatment temperature is 150-180 ℃ and the duration is 25-35 min, so that the finished heat-sealable plastic-free paper environment-friendly coating is obtained.
The ratio of the total weight of the water solvent to the coating material is 1: (0.64-0.82), the water solvent adopts a mixture of water and glycerin, wherein the weight ratio of the water to the glycerin is 1: (0.3-0.5), the weight ratio of epoxide crosslinking agent in S03 to epoxide crosslinking agent in S04 is 3:2, deionized water is adopted as water.
The degassing method in S10 includes: and (3) moving the coating material into a vacuumizing device, and operating the vacuumizing device to keep the vacuum state for 30-50 min, so as to remove air in the coating material.
The degassing method in S10 includes: the coating material is moved to a sealed vibration container, vibrated by the vibration container, and heated so that the coating material reaches a boiling point, thereby removing air from the coating material.
The primary mixing method in S04 comprises the following steps: mixing and stirring the nano oxide, the water-based adhesive, the mucilage glue, the alginate and the algae colloid, promoting the mixing by an ultrasonic generator for 1-1.5 hours, then adding the epoxide crosslinking agent, continuously stirring, and keeping the temperature of the solution at 70-80 ℃ for 2-2.5 hours.
The primary mixing method in S04 comprises the following steps: mixing and stirring the nano oxide and the algae colloid, controlling the temperature to be 20-30 ℃ for 1-2 hours, heating and drying the mixture for 20-30 minutes at the drying temperature of 70-80 ℃, adding the viscose, the alginate and the epoxide crosslinking agent, and continuously stirring to ensure that the temperature of the mixture is 70-90 ℃ for 2-2.5 hours.
The feeding method of the heat-sealable plastic-free paper environment-friendly coating adopts the preparation method of the heat-sealable plastic-free paper environment-friendly coating, and the method comprises the following steps:
step one: the surface of the plastic-free paper is treated, the surface of the plastic-free paper is treated through a soft brush wheel, the pressure applied by the soft brush wheel to the surface of the plastic-free paper is 0.1-0.15MPa, the soft brush wheel rotates, the plastic-free paper moves, and the difference between the linear speed of the outermost wall of the soft brush wheel and the moving speed of the plastic-free paper is 0.6-1 m/min;
step two: spraying a cationic surfactant on the surface of the plastic-free paper;
step three: pouring the coating material into a coating machine, ensuring the temperature of the coating material to be 70-80 ℃, moving the plastic-free paper subjected to the first step into the coating machine, and coating the surface of the plastic-free paper through the coating machine;
step four: spraying a solution on the surface of the coating, wherein the solution is a mixture of snow pear acid, an antibacterial mildew inhibitor, epoxy resin and starch aqueous solution;
step five: the plastic-free paper coating is dried.
The weight ratio of the snow pear acid, the antibacterial mildew preventive, the epoxy resin solvent and the starch aqueous solution is (5-10): (10-12): (12-20): 100, in the step three, the weight ratio of starch to water in the starch aqueous solution is (1-2): 100, in the first step, the pressure applied by the soft brush wheel to the surface of the plastic-free paper is positively correlated with the thickness of the plastic-free paper.
Natural fibers include natural plant fibers and natural animal fibers, and in selecting natural fibers, some degradable ones are selected, and in the preparation method, a fiberizing treatment is used.
The nano silicon oxide and nano aluminum oxide are used, so that the mechanical property of the coating can be effectively improved, and the nano silicon oxide and nano aluminum oxide are used in the ingredients of the environment-friendly coating, so that the mechanical property of the coating is enhanced, and the environment protection is not influenced after degradation.
By bio-based polymers is meant polymers derived from living beings or biological processes, which are generally renewable and biodegradable.
The aqueous adhesive is one or a mixture of a plurality of geometrically-selected substances, polyvinyl alcohol, polyacrylate and polyacrylic acid, and is an adhesive which takes water as a dispersion medium or solvent. Due to their high adhesion, low emission of volatile organic compounds, easy handling and cleaning properties, aqueous adhesives are often used for the preparation of plastic-free paper environmental protection coatings.
The viscose adopts one or a mixture of chitin viscose, cellulose ether viscose and natural resin viscose, and the viscose is used for increasing the adhesive property between materials in the preparation of the coating; heat-shrinkable resins, which can be heat-shrinkable by using one or a mixture of polyhydroxyalkanoic acid and polycaprolactone, shrink when heated, thereby shrinking the coating and tightly bonding with other materials; the adhesive is prepared by carrying out chemical treatment on a material containing natural cellulose, and the adhesive uses the natural cellulose as a raw material, so that the adhesive does not pollute the environment, and can ensure that the coating has higher bonding degree with other materials (such as paper board, metal and the like), thereby playing a better protection role.
The polysaccharase comprises amylase and cellulase, wherein a mixture of the amylase and the cellulase is adopted in the formula, the starch is modified through the amylase and the cellulase, and the amylase can accelerate the decomposition of the starch to generate soluble dextrin and micromolecular saccharides, so that the interaction of the starch and the cellulose is promoted. When the plastic-free paper coating is prepared, starch can be combined with cellulose more easily by adding a proper amount of amylase, so that the mechanical strength and the tensile strength of paper are enhanced, and the stability and the water resistance of the paper are improved.
The cellulose can be degraded by the cellulose, so that the cellulose becomes more uniform and finer. In the preparation of the plastic-free paper coating, the proper amount of cellulase is added, so that the surface of the paper is smoother and more uniform under the condition of not damaging the structure and the performance of the paper, and the adhesive force and the waterproof performance of the coating are enhanced.
Sodium alginate is a natural polysaccharide, has good biodegradability and biocompatibility, is widely applied in the field of environment-friendly materials, combines sodium alginate with natural materials such as cellulose, can be prepared into products such as paper, packaging materials and the like, has good degradability and recoverability, calcium alginate can also be used for paper coating to form a layer of waterproof and oil-proof coating, so that the paper has better water resistance and oil resistance, diatomite colloid and brown algae colloid are used, in a plastic-free paper coating, the diatomite colloid can be used as a thickener, a rheological agent and a filler, the consistency and the coating performance of the coating are improved, the brown algae colloid can be used as a gelatinizing agent, an adhesive and an emulsifying agent in the coating, and the good adhesiveness and the gelatinization of the coating are endowed, and meanwhile, calcium alginate and sodium alginate can form an alginate colloid with good gelatinization and emulsibility in the preparation process, so that the gelatinization of the coating is improved, and the alginate colloid has stronger adhesiveness and cohesiveness, so that the structural stability and durability of the coating can be enhanced.
Deionized water is specially treated water, ions in the deionized water are removed, so that the electric conductivity of the deionized water is very low, no electrolyte is almost contained, the deionized water can be used for preparing a high-quality coating in the preparation process of a plastic-free paper coating, and the problems of ion exchange reaction, electrolyte precipitation and the like in the coating can be avoided because the deionized water is almost free of ions and electrolytes, so that a more uniform, transparent and smooth coating is obtained, and meanwhile, the adhesive force and the water resistance of the coating can be improved by the deionized water. When ions and electrolytes are contained in the coating, they interact with the ions and electrolytes on the paper surface, thereby affecting the adhesion and water resistance of the coating. Deionized water can avoid the interaction, thereby improving the quality of the coating.
The feeding method of the plastic-free paper environment-friendly coating adopts a coating machine, the pressure applied by the soft brush wheel to the surface of the plastic-free paper is selected according to the thickness of the plastic-free paper, the soft brush wheel is contacted with the plastic-free paper, the plastic-free paper moves, and the soft brush wheel rotates, so that the soft brush wheel processes the plastic-free paper.
Snow pear acid can be obtained by chemical synthesis or extracted from natural sources (e.g., fruits, vegetables, etc.). The coating has good film forming performance and coating adhesive force, and can form a layer of transparent and waterproof film on the surface of the coating, thereby playing roles of dampproofing, protecting and prolonging the service life of paper.
In S03, the epoxide crosslinking agent may react with the bio-based polymer and the polyhydroxyalkanoate to form a stable network structure, thereby increasing the performance of the coating.
In the degassing method, the material is in a vacuum state through a vacuumizing device, so that gas in the material is removed, or the material is heated and vibrated, so that air in the material is removed, and the quality and performance of the coating are improved through removing the air in the material.
The hot press process is a key step in the preparation of materials, which applies heat and pressure to the materials simultaneously, and is usually performed in a hot press, which can control the temperature and pressure to specific levels, and the hot press process can make the materials more compact and increase the hardness and strength thereof. This helps to improve the durability and wear resistance of the product.
In the formula of the coating, environment-friendly materials are adopted, and part of the coating is degradable, so that the environment-friendly property of the coating is greatly improved.
In primary mixing, firstly, nano oxide, a water-based adhesive, viscose, alginate and algae colloid are mixed and stirred, ultrasonic waves can generate a high-intensity cavitation effect and micro vortex so as to break particle aggregation and enable internal components to be uniform, and secondly, firstly, the nano oxide and the algae colloid are mixed and stirred, and some functional groups (such as hydroxyl, amino and the like) in the nano oxide and the algae colloid can form a complex with metal ions, so that a complexation reaction is generated, the mechanical property of a coating is enhanced, and after an epoxide cross-linking agent is added, the two ways of the complex reaction are adopted, and cross-linking reaction occurs. This reaction can further enhance the mechanical properties and durability of the material.
The cellulose base material is immersed in the nano oxide colloid solution, so that the adhesive force and the wear resistance of the coating can be improved.
The surface of the plastic-free paper is treated by the hairbrush and the surface of the plastic-free paper is sprayed with the cationic surfactant, so that the coating can be better combined with the surface of the plastic-free paper when the plastic-free paper is fed, the falling-off condition is avoided, and after the coating is fed, the solution is sprayed on the surface of the coating, so that the coating forms a film, and the oil proofing, antibacterial performance and durability of the coating can be further improved.
Through setting up on the coating batching, through the use to the coating batching change, the algae colloid and nano-oxide, the mixture between algae colloid and the nano-oxide, make solution inside produce complex reaction, thereby increase the performance of solution, thereby improve the mechanical properties of coating, thereby the use of alginate increases the waterproof and grease proofing performance of coating, further increase the environmental protection coating result of no plastic paper, realize the mechanical properties of no plastic paper environmental protection coating, thereby make this no plastic coated paper can be applied to some positions that need to move, and guarantee that the coating can not drop easily in the activity process, the time of having improved no plastic coated paper result of use, for example disposable gloves, disposable gloves can keep on moving in the use process, though the time of moving is limited, but the requirement is higher to no plastic coated paper in the activity, disposable gloves that make through above-mentioned formula, because its outstanding bursting strength, vertical degree and elongation, can satisfy finger activity needs, the grease proofing of its own simultaneously, disposable effect has been guaranteed, and to no plastic coated paper surface treatment and the surface treatment of no plastic paper can not be applied to the position that the no plastic coated paper is sprayed, thereby make the adhesion between the position can not be used in the activity coating in the activity process.
Glycerol is a biodegradable aqueous solvent with good solubility and stability. It can be used as one of the components of environment-friendly materials for improving the softness and ductility of the coating.
Comparison group one:
the food grade of environmental protection coating (Meiyiji) of plastic-free coated paper in the market is adopted, wherein the plastic-free paper adopts kraft paper.
Comparison group two:
adopts degradable plastic-free coated composite paper (DX Dongxin), wherein the plastic-free paper adopts kraft paper.
Experiment group one:
kraft paper is used for the plastic-free paper, and the coating ingredients comprise 25wt% of natural fibers, 10wt% of nano oxides, 20wt% of starch, 3wt% of water-based adhesives, 30wt% of bio-based polymers, 3wt% of polyhydroxyalkanoates, 1wt% of viscose, 5wt% of polycaprolactone, 2wt% of heat-shrinkable resins, 3wt% of alginates, 0.2wt% of epoxide crosslinking agents, 0.8wt% of calcined soda, 1wt% of algae colloid and 1wt% of polysaccharidase.
In the preparation process, in SO4, the primary mixing method is to mix and stir nano oxide, aqueous adhesive, viscose, alginate and algae colloid, promote mixing by an ultrasonic generator for 1-1.5 hours, then add epoxide crosslinking agent, continuously stir, and enable the temperature of the solution to be 70-80 ℃ for 2-2.5 hours, wherein the degassing method is to move the coating material to a sealed vibration container, vibrate the coating material by the vibration container, and heat the coating material to enable the coating material to reach a boiling point, thereby removing air in the coating material.
Experimental group two:
kraft paper was used for the plastic-free paper and the formulation was the same as in experimental group one except for the algae colloid and the bio-based polymer, wherein the algae colloid was 2wt% and the bio-based polymer was 31wt%, and the preparation method was identical.
Experimental group three:
kraft paper was used for the plastic-free paper and was identical to the formulation in experimental group one except for the alginate and the bio-based polymer, wherein the alginate was 4wt% and the bio-based polymer was 31wt% and the preparation method was identical.
Experimental group four:
the kraft paper is used as the plastic-free paper, the formula is the same as that in the first experimental group, in the preparation method, in the aspect of the primary mixing method, the nano oxide and the algae colloid are mixed and stirred, the temperature is controlled to be 20-30 ℃ for 1-2 hours, then the mixture is heated and dried for 20-30 minutes, the drying temperature is 70-80 ℃, and then the viscose, the alginate and the epoxide crosslinking agent are added for continuous stirring, so that the temperature of the mixture is 70-90 ℃ for 2-2.5 hours.
Control group one:
kraft paper is used as the plastic-free paper, the formulation is the same as that in the first experimental group, except for the algae colloid, the content of the algae colloid in the first control group is 0, and the preparation method is the same as that in the first experimental group.
Control group two:
kraft paper was used for the plastic-free paper, and the formulation was the same as that in the first experimental group, except for the algae colloid, the alginate content in the first control group was 0, and the preparation method was the same as that in the first experimental group.
The thickness of the plastic-free paper is the same, the thickness of the coating is the same, and the same coating feeding method is adopted in the experimental group and the control group.
The coated paper was tested using the following method, which included:
determination of paper burst GB/T454;
determination of paper tear GB/T455.1;
determination of tensile Strength of paper and cardboard (constant speed Loading method) GB/T453-2002;
as for the water-repellent performance, when a so-called cobbisize test method (tappi t 441) which is one of conventional methods in the paper industry is applied, water-repellent performance of 10.0g/m2 or less is exhibited;
the heat bond strength was measured by using a heat sealing device (SamboTech, SK-310) and heat sealing was performed at a seal strength of 5;
test method (TAPPIT 559 cm-02) for testing oil repellency;
by performing multiple tests (at least 5 times) on the same product, data were obtained and the average calculated to give table 1:
TABLE 1
| Project | Burst (kpa) | Longitudinal tear strength (mN) | Elongation (%) | Oil repellency properties | Waterproof property | Heat sealing strength (gf/inch) |
| Comparative group one | 230 | 180.0 | 2.2 | 6.8 | 7.7 | 342.5 |
| Comparison group two | 232 | 192.0 | 2.4 | 6.7 | 7.8 | 335.0 |
| Experiment group one | 240 | 201.2 | 4.2 | 6.8 | 7.8 | 348.2 |
| Experiment group II | 243 | 209.1 | 3.8 | 6.8 | 7.9 | 340.1 |
| Experiment group III | 238 | 203.2 | 4.0 | 7.0 | 8.2 | 349.2 |
| Experiment group four | 245 | 201.6 | 3.9 | 6.8 | 7.9 | 343.5 |
| Control group one | 239 | 200.2 | 3.5 | 6.8 | 7.8 | 340.0 |
| Control group one | 241 | 202.6 | 3.7 | 6.7 | 7.8 | 342.1 |
The formula and the preparation method thereof can be obviously and extremely high in the bursting strength, longitudinal tear strength and elongation of the coating by combining the first comparison group, the second comparison group and the first comparison group, the structural stability and durability of the enhanced coating can be improved by adding the algae colloid by combining the first comparison group, the third comparison group and the second comparison group, the water resistance and oil resistance of the coating can be effectively improved by adding the alginate by combining the first comparison group, the third comparison group and the fourth comparison group, the tensile strength of the material can be improved by combining the first comparison group and the fourth comparison group, and in the actual production process, the formula and the preparation method of the specific product can be specifically adjusted due to different application sites of the actual product, the longitudinal tear strength and elongation can be improved, the toughness of the coating can be improved, and the interconnectivity between the coatings can be improved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended embodiments and equivalents thereof.
Claims (10)
1. A formulation for a heat sealable, plastic-free paper environmental protection coating, comprising:
the weight ratio of the components is as follows: 20-30wt% of natural fiber, 10-16wt% of nano oxide, 10-20wt% of starch, 3-8wt% of water-based adhesive, 25-35wt% of bio-based polymer, 3-5wt% of polyhydroxyalkanoate, 1-3wt% of viscose, 5-7wt% of polycaprolactone, 2-3wt% of heat-shrinkable resin, 3-5wt% of alginate, 0.2-0.4wt% of epoxide crosslinking agent, 0.5-0.8wt% of sodium carbonate, 1-2wt% of algae colloid and 0.8-1.3wt% of polysaccharase.
2. The formulation of a heat sealable plastic free paper environmental protection coating according to claim 1, wherein: the nano oxide comprises nano silicon oxide and nano aluminum oxide, and the weight ratio of the nano silicon oxide to the nano aluminum oxide is (0.2-0.3): 1, the polysaccharase comprises amylase and cellulase, and the weight ratio between the amylase and the cellulase is 1: (0.8-1.3), wherein the alginate is one or a mixture of sodium alginate and calcium alginate, and the algae colloid is one or a mixture of diatomite colloid and brown algae colloid.
3. The preparation method of the heat-sealable plastic-free paper environment-friendly coating is characterized by comprising the following steps of:
s01: manufacturing an aqueous solvent;
s02: removing impurities from the natural fibers and performing fibrosis treatment to enable the natural fibers to pass through sieve holes to obtain a cellulose base material;
s03: mixing the bio-based polymer, the polyhydroxyalkanoate and the epoxide crosslinking agent through a mixer to form a mixture, and refining the mixture to enable the mixture to pass through sieve holes;
s04: primarily mixing nano oxide, a water-based adhesive, viscose, alginate, algae colloid and an epoxide crosslinking agent to form a nano oxide colloid solution;
s05: heating the water solvent to keep the water temperature between 40 and 50 ℃, dispersing starch in a proper amount of water solvent, and uniformly stirring to form a starch solution;
s06: adding polysaccharase into the solution in S05, continuously stirring, continuously adding sodium carbonate at 30-40 ℃ for 2-3 hours, and neutralizing the solution to enable the pH value of the solution to be 7.0-7.8, thus obtaining a mixed solution of modified starch and starch;
s07: the cellulose base material is immersed in the nano oxide colloid solution and stirred;
s08: pouring the mixture into the mixed solution in the step S06, heating and stirring the mixed solution, ensuring that the temperature of the solvent is between 70 and 80 ℃ for 1.5 to 2 hours, wherein a drainage device is arranged for avoiding steam generated during heating and backflow of the steam into the solvent until the solvent forms a viscous state;
s09: mixing and stirring the nano oxide colloid solution and the viscosity of S07, adding alginate, ensuring that the temperature of a container is kept between 50 and 60 ℃ during stirring, and stirring and applying for 3 to 4 hours to prepare a coating material;
s10: the temperature of the coating material passes through the sieve holes at 60-70 ℃ in a hot extrusion mode, and air in the coating material is removed by a degassing method;
s11: and (3) transferring the coating material into a hot press, wherein the treatment temperature is 150-180 ℃ and the duration is 25-35 min, so that the finished heat-sealable plastic-free paper environment-friendly coating is obtained.
4. A method of preparing a heat sealable plastic free paper environmental protection coating according to claim 3, wherein: the total weight ratio of the water solvent to the coating material is 1: (0.64-0.82), wherein the water solvent adopts a mixture of water and glycerin, and the weight ratio of the water to the glycerin is 1: (0.3-0.5), wherein the weight ratio of the epoxide crosslinking agent in S03 to the epoxide crosslinking agent in S04 is 3:2, deionized water is adopted as water.
5. A method of preparing a heat sealable plastic free paper environmental protection coating according to claim 3, wherein: the degassing method in S10 includes: and (3) moving the coating material into a vacuumizing device, and operating the vacuumizing device to keep the vacuum state for 30-50 min, so as to remove air in the coating material.
6. A method of preparing a heat sealable plastic free paper environmental protection coating according to claim 3, wherein: the degassing method in S10 includes: the coating material is moved to a sealed vibration container, vibrated by the vibration container, and heated so that the coating material reaches a boiling point, thereby removing air from the coating material.
7. A method of preparing a heat sealable plastic free paper environmental protection coating according to claim 3, wherein: the primary mixing method in the S04 comprises the following steps: mixing and stirring the nano oxide, the water-based adhesive, the mucilage glue, the alginate and the algae colloid, promoting the mixing by an ultrasonic generator for 1-1.5 hours, then adding the epoxide crosslinking agent, continuously stirring, and keeping the temperature of the solution at 70-80 ℃ for 2-2.5 hours.
8. A method of preparing a heat sealable plastic free paper environmental protection coating according to claim 3, wherein: the primary mixing method in the S04 comprises the following steps: mixing and stirring the nano oxide and the algae colloid, controlling the temperature to be 20-30 ℃ for 1-2 hours, heating and drying the mixture for 20-30 minutes at the drying temperature of 70-80 ℃, adding the viscose, the alginate and the epoxide crosslinking agent, and continuously stirring to ensure that the temperature of the mixture is 70-90 ℃ for 2-2.5 hours.
9. The feeding method of the heat-sealable plastic-free paper environment-friendly coating is characterized by comprising the following steps of: a plastic-free paper environmental protection coating prepared by the method for preparing a heat sealable plastic-free paper environmental protection coating according to any of claims 3-8, said method comprising:
step one: the surface of the plastic-free paper is treated, the surface of the plastic-free paper is treated through a soft brush wheel, the pressure applied by the soft brush wheel to the surface of the plastic-free paper is 0.1-0.15MPa, the soft brush wheel rotates, the plastic-free paper moves, and the difference between the linear speed of the outermost wall of the soft brush wheel and the moving speed of the plastic-free paper is 0.6-1 m/min;
step two: spraying a cationic surfactant on the surface of the plastic-free paper;
step three: pouring the coating material into a coating machine, ensuring the temperature of the coating material to be 70-80 ℃, moving the plastic-free paper subjected to the first step into the coating machine, and coating the surface of the plastic-free paper through the coating machine;
step four: spraying a solution on the surface of the coating, wherein the solution is a mixture of snow pear acid, an antibacterial mildew inhibitor, epoxy resin and starch aqueous solution;
step five: the plastic-free paper coating is dried.
10. The method for loading the heat-sealable plastic-free paper environmental protection coating according to claim 9, wherein: the weight ratio of the snow pear acid, the antibacterial mildew inhibitor, the epoxy resin solvent and the starch aqueous solution is (5-10): (10-12): (12-20): 100, wherein in the third step, the ratio of starch to water gravity in the starch aqueous solution is (1-2): 100, in the first step, the pressure applied by the soft brush wheel to the surface of the plastic-free paper and the thickness of the plastic-free paper are positively correlated.
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