CN116411482A - Environment-friendly heat-sealing paper for recycling paper packaging boxes and preparation method thereof - Google Patents
Environment-friendly heat-sealing paper for recycling paper packaging boxes and preparation method thereof Download PDFInfo
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- CN116411482A CN116411482A CN202111683228.1A CN202111683228A CN116411482A CN 116411482 A CN116411482 A CN 116411482A CN 202111683228 A CN202111683228 A CN 202111683228A CN 116411482 A CN116411482 A CN 116411482A
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- acrylic acid
- acid copolymer
- waterproof
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 85
- 238000004064 recycling Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 title abstract description 27
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims abstract description 118
- 239000011259 mixed solution Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000010410 layer Substances 0.000 claims description 155
- 238000000576 coating method Methods 0.000 claims description 105
- 239000011248 coating agent Substances 0.000 claims description 103
- 239000000839 emulsion Substances 0.000 claims description 45
- 238000001035 drying Methods 0.000 claims description 33
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000012793 heat-sealing layer Substances 0.000 claims description 16
- 230000007613 environmental effect Effects 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 238000007865 diluting Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- 235000013871 bee wax Nutrition 0.000 claims description 9
- 239000012166 beeswax Substances 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 230000002209 hydrophobic effect Effects 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 7
- 229950008882 polysorbate Drugs 0.000 claims description 7
- 229920000136 polysorbate Polymers 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 239000003085 diluting agent Substances 0.000 claims description 5
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- -1 polydimethylsiloxane Polymers 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 4
- 150000002191 fatty alcohols Chemical class 0.000 claims description 4
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000008117 stearic acid Substances 0.000 claims description 3
- 235000013870 dimethyl polysiloxane Nutrition 0.000 claims description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 239000012895 dilution Substances 0.000 claims 1
- 238000010790 dilution Methods 0.000 claims 1
- 235000014347 soups Nutrition 0.000 abstract description 10
- 239000000835 fiber Substances 0.000 abstract description 7
- 239000004519 grease Substances 0.000 description 28
- 230000000052 comparative effect Effects 0.000 description 17
- 239000003921 oil Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 229920003023 plastic Polymers 0.000 description 10
- 239000004033 plastic Substances 0.000 description 10
- 235000013305 food Nutrition 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- 235000021056 liquid food Nutrition 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006353 environmental stress Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- QHZOMAXECYYXGP-UHFFFAOYSA-N ethene;prop-2-enoic acid Chemical group C=C.OC(=O)C=C QHZOMAXECYYXGP-UHFFFAOYSA-N 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 229940124531 pharmaceutical excipient Drugs 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 235000021055 solid food Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- 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
-
- 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
-
- 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
-
- 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
- D21H21/16—Sizing or water-repelling agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D2565/38—Packaging materials of special type or form
- B65D2565/381—Details of packaging materials of special type or form
-
- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wrappers (AREA)
Abstract
The application relates to the technical field of takeaway packaging, and more specifically relates to an environment-friendly heat-seal paper for recycling of paper packaging boxes and a preparation method thereof. According to the waterproof and oil-proof heat-seal layer, the waterproof layer and the oil-proof heat-seal layer are coated on the two surfaces of the paper layer respectively, so that the environment-friendly heat-seal paper recycled in a circulating way has waterproof property and oil-proof property, the waterproof layer prepared by the ethylene acrylic acid copolymer mixed solution A can be stably connected with the paper layer, the possibility of contact between the paper layer and water is reduced, the waterproof and oil-proof heat-seal layer prepared by the ethylene acrylic acid copolymer mixed solution B is stably connected with the paper layer, the possibility of contact between the paper layer and water and oil is reduced, and meanwhile, the waterproof and oil-proof heat-seal layer can be tightly combined with surface fibers of the paper packaging box through heat sealing, so that leakage of soup from an opening of the paper packaging box is effectively reduced.
Description
Technical Field
The application relates to the technical field of takeaway packaging, in particular to environment-friendly heat-sealing paper for recycling of paper packaging boxes and a preparation method thereof.
Background
The take-out brings great convenience to the life of people, and people can eat fresh and delicious food anytime and anywhere. The takeaway packing carton that most traders used at present is the plastics packing carton basically, and plastics packing carton has good high temperature resistant, waterproof and grease proofing performance, and plastics packing carton corresponds still to be furnished with the plastics lid simultaneously for the packing carton has good leakproofness, can prevent that liquid from leaking, thereby makes the packing carton both can adorn liquid food and can adorn solid food. The plastic packaging box brings great convenience to takeaway industry, but the plastic packaging box belongs to a substance which is difficult to degrade, and a large amount of plastic garbage is easy to generate, so that great harm is caused to the environment. Therefore, people begin to select materials which can replace plastics to prepare the packaging box, and paper is used as a recyclable, easily-recyclable material which can be used for preparing the packaging box instead of plastics, so that the environmental pollution can be effectively reduced.
However, the packaging box made of paper needs to be further processed in terms of oil resistance and water resistance, for example, oil resistance or water resistance treatment is respectively carried out on the inner surface and the outer surface of the paper packaging box, so that the problem that the paper packaging box bears food is solved. However, paper materials are relatively weak in terms of rigidity and toughness relative to plastic boxes, and in particular in terms of sealing, both rigidity and toughness are difficult to seal directly by way of a lid. Thus, for solid dry foods, the problem of using paper packaging boxes is not great, but for foods with soup, the soup easily leaks from the open edges of the paper packaging boxes. Therefore, even though the paper packaging box is more environmentally friendly, the paper packaging box still has great limitation in the field of food packaging due to the sealing defect, so that improvement is needed.
Disclosure of Invention
In order to improve the problem of packaging tightness of a paper packaging box, the application provides environment-friendly heat-sealing paper for recycling of the paper packaging box and a preparation method of the environment-friendly heat-sealing paper.
In a first aspect, the present application provides an environmental protection heat-seal paper for recycling of paper packaging boxes, which adopts the following technical scheme:
the environment-friendly heat-seal paper for recycling the paper packaging box sequentially comprises a waterproof layer, a paper layer and a waterproof and oil-proof heat-seal layer, wherein the waterproof layer is formed by coating ethylene acrylic acid copolymer mixed liquor A on the surface of the paper layer, and the waterproof and oil-proof heat-seal layer is formed by coating ethylene acrylic acid copolymer mixed liquor B on the other surface of the paper layer;
the ethylene acrylic acid copolymer mixed solution A consists of the following raw materials in percentage by mass:
20 to 50 percent of ethylene acrylic acid copolymer emulsion
Diluting solvent 45-65%
5-15% of a hydrophobic agent;
the ethylene acrylic acid copolymer mixed solution B comprises the following components in percentage by mass:
ethylene acrylic acid copolymer emulsion 20-49%
Diluting solvent 50-75%
1 to 5 percent of oleophobic agent.
Through adopting above-mentioned technical scheme, the environmental protection heat-seal paper of cyclic recovery who makes has good waterproof, grease proof and heat-seal performance, and temperature resistant scope is wide, can with paper packaging box zonulae occludens for paper packaging box can not reveal when holding liquid food. In addition, the recycled environment-friendly heat-sealing paper is prepared from paper materials, can be recycled and is beneficial to environmental protection.
The ethylene acrylic acid copolymer emulsion is usually used for skin care products and cosmetics, and the main function of the ethylene acrylic acid copolymer emulsion cosmetics and skin care products is film forming agents, so that the risk coefficient is low, the ethylene acrylic acid copolymer emulsion is safer, can be used safely, and is harmless to human bodies; in addition, the ethylene acrylic acid copolymer emulsion is degradable, is often used as an environment-friendly substance in various fields, and can replace most of non-degradable plastics, such as PE film, PP film, PS film, PVS film and the like.
The ethylene acrylic acid copolymer mixed solution A has good adhesiveness and water resistance, a layer of tight waterproof layer is formed after the ethylene acrylic acid copolymer mixed solution A is coated on the surface of the paper layer and dried, the ethylene acrylic acid copolymer mixed solution A is firmly adhered to the paper layer, the contact between moisture and the paper layer can be effectively prevented, the ethylene acrylic acid copolymer mixed solution B has good adhesiveness, water resistance and oil resistance, a layer of tight waterproof and oil resistance heat seal layer is formed after the ethylene acrylic acid copolymer mixed solution B is sprayed on the other surface of the paper layer and dried, the contact between moisture and oil and the paper layer can be effectively reduced, and meanwhile, the waterproof and oil resistance heat seal layer also has good heat seal property; the paper packaging box is usually made of plant fibers, particularly the paper packaging box made of bagasse, denser fibers are arranged on the surface of the paper packaging box, the waterproof and oilproof heat-sealing layer is bonded with the paper packaging box in a heat sealing mode, the surface fibers of the paper packaging box are tightly combined with the waterproof and oilproof heat-sealing layer, the opening of the paper packaging box is completely sealed to form a closed environment, the paper packaging box seals soup foods in the paper packaging box, the possibility that soup leaks from the edge of the paper packaging box is effectively reduced, and the paper packaging box is high in practicability.
The ethylene acrylic acid copolymer emulsion has good cohesiveness and is easy to attach to the surface of the paper layer, the ethylene acrylic acid copolymer emulsion has good hydrophobicity so as to be convenient for water resistance, and the hydrophobic agent is used together with the ethylene acrylic acid copolymer emulsion, so that the water resistance of the waterproof layer can be further improved.
The ethylene acrylic acid copolymer emulsion also has good grease resistance so as to facilitate the water and grease proofing, the surface fiber of the paper packaging box can be tightly combined with the ethylene acrylic acid copolymer, so that the opening of the paper packaging box is completely sealed by the recycled environment-friendly heat-sealing paper, the possibility of soup leakage is further reduced, the grease proofing performance of the water and grease proofing heat-sealing layer is improved by mixing the oleophobic agent with the ethylene acrylic acid copolymer emulsion, the heat-sealing performance of the water and grease proofing heat-sealing layer is better, the heat-sealing can be carried out with the opening of the paper packaging box at 130-160 ℃, and after the heat-sealing, the water and grease proofing heat-sealing layer is stably connected with the paper packaging box, so that the soup leakage is effectively prevented.
The thinner can reduce the viscosity of the ethylene acrylic acid copolymer emulsion, increase the fluidity of the ethylene acrylic acid copolymer emulsion, ensure that the ethylene acrylic acid copolymer emulsion and the hydrophobe can be uniformly mixed, and further improve the waterproof performance of the waterproof layer; the ethylene acrylic acid copolymer emulsion and the oleophobic agent can be uniformly mixed, and the oil-proof and water-proof performance of the waterproof and oil-proof heat seal layer is further improved.
Preferably, each part of the diluting solvent consists of 30-40% of ethanol by mass and 60-70% of water by mass.
Through adopting above-mentioned technical scheme for diluting solvent can dilute ethylene acrylic acid copolymer emulsion, reduces ethylene acrylic acid copolymer emulsion's viscosity, increases ethylene acrylic acid copolymer emulsion's mobility, makes ethylene acrylic acid copolymer emulsion and other materials can mix evenly, and the coating of being convenient for further improves waterproof layer's waterproof performance and grease proofing performance, and ethanol and water are volatile material, make waterproof layer and waterproof grease proofing heat seal layer easily dry.
Preferably, the hydrophobic agent is at least one of beeswax, polydimethylsiloxane, polyvinyl alcohol or stearic acid.
By adopting the technical scheme, the waterproof layer prepared by adopting the substances is nontoxic and harmless, safe and environment-friendly, good in hydrophobic and dampproof performance, good in film forming performance and adhesive force, easy to bond with a paper layer and further capable of improving the waterproof performance of the waterproof layer. The beeswax has strong plasticity, good lubricity and strong hydrophobicity, and is used together with ethylene acrylic acid copolymer emulsion to improve the waterproof capability of a waterproof layer, and meanwhile, the beeswax is used as an edible material, so that the safety level is high; the polydimethylsiloxane has good hydrophobic and dampproof properties and low surface tension, and can be used together with other materials, so that the waterproof capability of a waterproof layer can be improved; the viscosity of the polyvinyl alcohol is good, the waterproof performance is good, and the polyvinyl alcohol is used together with the ethylene acrylic acid copolymer emulsion, so that the viscosity of the ethylene acrylic acid copolymer mixed solution A can be increased, and the waterproof performance of the waterproof layer is further improved; the stearic acid has good hydrophobicity and no toxicity, and can be used together with ethylene acrylic acid copolymer emulsion to improve the waterproof capability of the waterproof layer.
Preferably, the oleophobic agent is at least one of polysorbate or fatty alcohol-ethylene oxide.
Through adopting above-mentioned technical scheme, polysorbate and fatty alcohol oxyvinyl ether all have the oleophobic property, use with ethylene acrylic acid copolymer emulsion mixture, make the grease proof performance of waterproof grease proofing heat seal improve, make the heat-seal performance of waterproof grease proofing heat seal better simultaneously, waterproof grease proofing heat seal layer film-forming nature of making is good, adhesive force is good, easily bonds with the paper layer, further improves waterproof performance and the grease proofing performance of waterproof grease proofing heat seal layer. The polysorbate has strong oiliness, strong adhesion and high safety, and can be used by being mixed with ethylene acrylic acid copolymer emulsion, so that the oil-proof performance and heat-sealing performance of the waterproof and oil-proof heat-sealing layer can be further improved, the connection stability between the waterproof and oil-proof heat-sealing layer and a paper packaging box is enhanced, the fatty alcohol-oxygen vinyl ether has good hydrophilicity and strong oleophobicity, and the fatty alcohol-oxygen vinyl ether is used by being mixed with the ethylene acrylic acid copolymer emulsion, so that the oil-proof performance of the waterproof and oil-proof heat-sealing layer is improved.
Preferably, the ethylene acrylic acid copolymer emulsion has a solids content of 20 to 35%.
By adopting the technical scheme, the prepared environment-friendly heat-seal paper for recycling has good flexibility, thermal stability and processability, and meanwhile, the environment stress cracking resistance, impact resistance and bending fatigue resistance of the environment-friendly heat-seal paper for recycling are improved, and the environment-friendly heat-seal paper for recycling, which can be used by mixing materials, has good toughness, further enables both waterproof layers and waterproof and oil-proof heat-seal layers to have good waterproof performance, and simultaneously enables the waterproof layers and the waterproof and oil-proof heat-seal layers to have toughness and strength, so that the waterproof and oil-proof heat-seal layers can be tightly combined with a paper packaging box, and the sealing firmness is improved; when the solid content of the ethylene acrylic acid copolymer emulsion is less than 20%, the film forming thickness is uneven, the flexibility, the environmental stress cracking resistance, the impact resistance and the bending fatigue resistance are poor, so that the oil resistance and the water resistance of the recycled environment-friendly heat sealing paper are poor; when the solid content is more than 35%, the viscosity is increased, the fluidity is low, and the coating is easy to be uneven when the coating is mixed with materials, so that the film forming thickness is different.
Preferably, the waterproof layer is formed by one-time coating, and the coating dry weight of the waterproof layer is 6-9 g/m 2 。
By adopting the technical scheme, the waterproof layer has better and excellent waterproof performance, the ethylene acrylic acid copolymer emulsion, water, ethanol and the hydrophobe are mixed for use, the mixture is coated on the surface of the paper layer, the waterproof layer is prepared after drying, and the coating dry weight after drying is 6-9 g/m 2 The ethanol and water are volatilized in the drying process, and the waterproof layer also contains a small part of water, so that the surface of the waterproof layer has certain wettability, and the surface wettability can reach more than 38%, so that the surface of the waterproof layer can be printed conveniently.
Preferably, the waterproof and oil-proof heat sealing layer is formed by two coating processes, and the dry weight of each coating process of the waterproof and oil-proof heat sealing layer is 2-5 g/m 2 。
Through adopting above-mentioned technical scheme, make waterproof grease proofing heat seal layer have better excellent grease proof and waterproof performance, waterproof and grease proof performance of waterproof grease proofing heat seal layer can be further strengthened to twice coating, the heat-seal effect of the environmental protection heat seal paper of reinforcing cyclic utilization simultaneously makes cyclic utilization's environmental protection heat seal paper and paper packaging box can be firm to be connected, makes cyclic utilization's environmental protection heat seal paper can carry out the heat-seal with paper packaging box's opening part under 130 ~ 160 ℃.
Preferably, the weight of the paper layer is 70-90 g/m 2 。
When people use the environment-friendly heat-seal paper packaging box sealed by the mold, the heat-seal film must be ensured to have certain strength, so that the recycled environment-friendly heat-seal paper has certain strength, the environment-friendly heat-seal paper is prevented from being broken when being bumped, the paper layer is used in combination with the waterproof layer and the waterproof and oil-proof heat-seal layer,the prepared environment-friendly heat seal is thinner and has better strength, and is not easy to damage; when the weight of the paper layer is less than 70g/m 2 In the process, the thickness of the recycled environment-friendly heat-seal paper is light and thin, but the strength of the environment-friendly heat-seal paper is reduced, and the environment-friendly heat-seal paper is easy to damage; when the weight of the paper layer is more than 70g/m2, the thickness of the recycled environmental-friendly heat-seal paper increases, but it is not necessary to increase the thickness too much for the heat-seal film for the paper packaging box to increase the production cost of enterprises.
In a second aspect, the present application provides a method for preparing an environmental protection heat sealing paper for recycling a paper packaging box, which adopts the following technical scheme:
the preparation method of the environment-friendly heat-seal paper for recycling the paper packaging box comprises the following steps of:
ethylene acrylic acid copolymer blend a: preparing and mixing ethylene acrylic acid copolymer emulsion, a diluting solvent and a hydrophobe according to the mass fractions of 20-50%, 45-65% and 5-15%, and uniformly stirring to obtain ethylene acrylic acid copolymer mixed solution A;
ethylene acrylic acid copolymer mixed solution B: mixing ethylene acrylic acid copolymer emulsion, a diluting solvent and an oleophobic agent according to the mass fraction of 20-50%, 45-65% and 1-5%, and uniformly stirring to obtain ethylene acrylic acid copolymer mixed solution B;
coating a waterproof layer: coating the prepared ethylene acrylic acid copolymer mixed solution A on the surface of the paper layer, wherein the coating wet weight of the ethylene acrylic acid copolymer mixed solution A is 20-30 g/m 2 Drying after coating, wherein the drying temperature is 95-105 ℃, and preparing the waterproof layer;
coating a waterproof and oil-proof heat seal layer: coating the ethylene acrylic acid copolymer mixed solution B on the other surface of the paper layer, wherein the first coating wet weight of the ethylene acrylic acid copolymer mixed solution B is 25-35 g/m 2 Drying after coating, wherein the drying temperature is 95-105 ℃, continuously coating the ethylene acrylic acid copolymer mixed solution B on the surface of the dried surface of the first coating again, wherein the second coating wet weight is smaller than the first coating wet weight, drying after spraying, and the drying temperatureThe temperature is 95-105 ℃ to prepare the waterproof and oil-proof heat sealing layer
According to the method, the ethylene acrylic acid copolymer mixed solution A is prepared, so that the ethylene acrylic acid copolymer mixed solution A has good adhesiveness and water resistance, and a layer of tight waterproof layer is formed after the ethylene acrylic acid copolymer mixed solution A is coated on the surface of the paper layer and dried, is firmly adhered to the paper layer, and can effectively prevent moisture from contacting the paper layer; according to the preparation method, the ethylene acrylic acid copolymer mixed solution B is prepared, so that the ethylene acrylic acid copolymer mixed solution B has good adhesion, water resistance and oil resistance, and a layer of compact waterproof and oil-proof heat seal layer is formed after the ethylene acrylic acid copolymer mixed solution B is sprayed on the other surface of the paper layer and dried, so that the contact between moisture and oil and the paper layer can be effectively reduced, and meanwhile, the waterproof and oil-proof heat seal layer also has good heat seal property.
The waterproof layer is coated, and the coating mode is adopted, so that the ethylene acrylic acid copolymer mixed solution A can be uniformly coated on the surface of the paper layer, the thickness of the waterproof layer is uniform, and the waterproof performance of the waterproof layer is further improved.
The waterproof and oil-proof heat-sealing layer is coated in a coating mode, so that the ethylene acrylic acid copolymer mixed solution A can be uniformly coated on the surface of the paper layer, the thickness of the waterproof layer is uniform, and the waterproof performance and the oil-proof performance of the waterproof and oil-proof heat-sealing layer can be further enhanced by two-time coating.
The waterproof layer and the waterproof and oil-proof heat seal layer are prepared by adopting the method, and the method is simple to operate and easy to produce.
Preferably, when the water-proof and oil-proof heat-seal layer is sprayed, the paper feeding direction of the paper layer is opposite to the rotating direction of the press roller with the ethylene acrylic acid copolymer mixed solution B adhered to the surface, namely, the coating mode of the water-proof and oil-proof heat-seal layer is a reverse coating mode.
Through adopting above-mentioned technical scheme for the surface of waterproof grease proofing heat seal layer is better smooth, and grease is difficult to hang on waterproof grease proofing heat seal layer surface, grease proofing performance preferred. The forward coating mode means that the paper feeding direction of the paper layer is the same as the rotation direction of the mixed hydraulic roller, the surface of the waterproof and oil-proof heat sealing layer is rough by adopting the forward coating mode, the surface is rough, more small pores are formed, and grease easily enters the small pores and is adhered to the surface of the waterproof and oil-proof heat sealing layer; and the reverse coating mode enables the paper layer to move relatively with the press roller adhered with the ethylene acrylic acid copolymer mixed solution B, so that the surface of the waterproof and oil-proof heat-seal layer is convenient to be smoothed, the surface of the waterproof and oil-proof heat-seal layer is smooth, the pores are less and small, grease is not easy to enter the gaps, and the grease is not easy to adhere to the surface of the waterproof and oil-proof heat-seal layer.
In summary, the present application has the following beneficial effects:
1. the waterproof layer and the waterproof and oil-proof heat seal layers are respectively coated on the two surfaces of the paper layer, so that the environment-friendly heat seal paper recycled has waterproof property and oil-proof property, the waterproof and oil-proof heat seal layer of the environment-friendly heat seal paper recycled is connected with a paper packaging box, the waterproof layer prepared by the ethylene acrylic acid copolymer mixed solution A can be stably connected with the paper layer, the possibility of contact between the paper layer and water is reduced, the waterproof and oil-proof heat seal layer prepared by the ethylene acrylic acid copolymer mixed solution B is stably connected with the paper layer, the possibility of contact between the paper layer and water and oil is reduced, and meanwhile, the waterproof and oil-proof heat seal layer can be tightly combined with surface fibers of the paper packaging box through heat sealing, so that leakage of soup from an opening of the paper packaging box is effectively reduced.
2. According to the waterproof layer, the ethylene acrylic acid copolymer emulsion, the diluting solvent and the hydrophobe are compounded for use, so that the waterproof performance of the waterproof layer is further improved, and the waterproof effect of the waterproof layer is better.
3. According to the application, the ethylene acrylic acid copolymer emulsion, the diluting solvent and the oleophobic agent are matched for use, the oil-grease resistance of the waterproof and oil-proof heat-seal layer is further improved, the bonding degree of the waterproof and oil-proof heat-seal layer and the surface fiber of the paper packaging box is improved, the environment-friendly heat-seal paper recycled is enabled to be stably connected with the paper packaging box, and the possibility of soup leakage is reduced.
Detailed Description
The present application is described in further detail below in connection with examples and comparative examples. The starting materials for the preparation examples, comparative preparation examples and examples in this application are all commercially available, and the following are sources and models of part of the starting materials.
Ethylene acrylic acid copolymer emulsion is purchased from Nanjing Tianshi New Material Co., ltd, model LW-290, and solid content is 30-32%.
Polysorbate is purchased from Shanxi jin ocean pharmaceutical excipients Co., ltd, and is rated as a superior product.
Polydimethylsiloxane is purchased from Nanjing danpei chemical industry Co., ltd., and the model is PMX-200.
Fatty alcohol oxyvinyl ether was purchased from Shanghai Kaim Co., ltd., CAS16875-66-1.
The beeswax is edible beeswax purchased from Zhengzhou kernel chemostat product, and the model is food grade.
The paper layer was purchased from Feneux paper Co., ltd, model 83g/cm 2 。
The paper packaging box is from Shaanxi Jinghui trade company, and the model is paper bowl 580ml.
Examples
Example 1
An environment-friendly heat-sealing paper for recycling paper packaging boxes is prepared by the following method:
ethylene acrylic acid copolymer blend a: 2 kg (solid content is 30%) of ethylene acrylic acid copolymer emulsion, 4.5 kg (water is 1.35 kg, ethanol is 3.15 kg) of diluent solvent and 0.5 kg of beeswax are weighed and stirred uniformly to prepare ethylene acrylic acid copolymer mixed solution A;
ethylene acrylic acid copolymer mixed solution B: 2 kg (solid content is 30%) of ethylene acrylic acid copolymer emulsion, 4.5 kg (water is 1.35 kg, ethanol is 3.15 kg), 0.1 kg of polysorbate and 0.01 kg of fatty alcohol oxyvinyl ether are weighed and stirred uniformly to prepare ethylene acrylic acid copolymer mixed solution B;
coating a waterproof layer: the prepared ethylene acrylic acid copolymer mixture A was roll-coated on a paper layer (paper layer: 82g/m 2 ) Is coated with a coating moisture of 24g/m 2 Drying after coating, wherein the drying temperature is 95 ℃ and the coating dry weight is 7.9g/m 2 Preparing a waterproof layer;
coating a waterproof and oil-proof heat seal layer: the method adopts a back-coating mode to carry out the preparation,the ethylene acrylic acid copolymer mixed solution B was applied to a paper layer (paper layer: 82g/m 2 ) Is coated with a coating moisture of 29g/m 2 Drying after coating, wherein the drying temperature is 95 ℃, and the coating dry weight is 3.9g/m 2 The ethylene acrylic acid copolymer mixed solution B was further coated on a paper layer (paper layer 82g/m by reverse coating 2 ) A coating wet weight of 24g/m 2 Drying after coating, wherein the coating dry weight is 3.9g/m 2 The drying temperature is 95 ℃, and the waterproof and oil-proof heat seal layer is prepared, thus obtaining the finished product.
Example 2
An environment-friendly heat-sealing paper for recycling paper packaging boxes is prepared by the following method:
ethylene acrylic acid copolymer blend a: weighing 4 kg (solid content is 30%), 5.5 kg (water is 1.65 kg, ethanol is 3.85 kg) of diluting solvent and 1 kg of beeswax of ethylene acrylic acid copolymer emulsion, and stirring uniformly to obtain ethylene acrylic acid copolymer mixed solution A;
ethylene acrylic acid copolymer mixed solution B: weighing 3 kg (solid content is 30%) of ethylene acrylic acid copolymer emulsion, 6.5 kg (water is 1.95 kg, ethanol is 4.55 kg) of diluent solvent and 0.25 kg of polysorbate, and uniformly stirring to obtain ethylene acrylic acid copolymer mixed solution B;
coating a waterproof layer: the prepared ethylene acrylic acid copolymer mixture A was roll-coated on a paper layer (paper layer: 83g/m 2 ) Is coated with a coating moisture of 24g/m 2 Drying after coating, wherein the drying temperature is 95 ℃ and the coating dry weight is 7.9g/m 2 Preparing a waterproof layer;
coating a waterproof and oil-proof heat seal layer: the ethylene acrylic acid copolymer mixed solution B was applied to a paper layer (83 g/m of paper layer) 2 ) Is coated with a coating moisture of 29g/m 2 Drying after coating, wherein the drying temperature is 95 ℃, and the coating dry weight is 3.9g/m 2 The ethylene acrylic acid copolymer mixed solution B was further applied to a paper layer (83 g/m) 2 ) A coating wet weight of 24g/m 2 Drying after coating, wherein the coating dry weight is3.9g/m 2 The drying temperature is 95 ℃, and the waterproof and oil-proof heat seal layer is prepared, thus obtaining the finished product.
Example 3
An environment-friendly heat-sealing paper for recycling paper packaging boxes is prepared by the following method:
ethylene acrylic acid copolymer blend a: weighing 5 kg (solid content is 32%) of ethylene acrylic acid copolymer emulsion, 6.5 kg (water is 1.95 kg, ethanol is 4.55 kg) of diluent solvent and 1 kg of polyvinyl alcohol, and uniformly stirring to obtain ethylene acrylic acid copolymer mixed solution A;
ethylene acrylic acid copolymer mixed solution B: weighing 4.9 kg (solid content is 32%) of ethylene acrylic acid copolymer emulsion, 7.5 kg (water is 2.25 kg, ethanol is 5.25 kg) of diluent solvent and 0.4 kg of fatty alcohol-ethylene oxide vinyl ether, and uniformly stirring to obtain ethylene acrylic acid copolymer mixed solution B;
coating a waterproof layer: the prepared ethylene acrylic acid copolymer mixture A was roll-coated on a paper layer (paper layer: 83g/m 2 ) Is coated with a coating moisture of 30g/m 2 Drying after coating, wherein the drying temperature is 95 ℃ and the coating dry weight is 9/m 2 Preparing a waterproof layer;
coating a waterproof and oil-proof heat seal layer: the ethylene acrylic acid copolymer mixed solution B was applied to a paper layer (83 g/m of paper layer) 2 ) Is coated with a coating moisture of 35m 2 Drying after coating, wherein the drying temperature is 95 ℃ and the coating dry weight is 4.5g/m 2 The ethylene acrylic acid copolymer mixed solution B was further applied to a paper layer (83 g/m) 2 ) A coating wet weight of 30g/m 2 Drying after coating, wherein the coating dry weight is 4.5g/m 2 The drying temperature is 95 ℃, and the waterproof and oil-proof heat seal layer is prepared, thus obtaining the finished product.
Example 4
This embodiment differs from embodiment 3 in that: the ethylene acrylic acid copolymer mixed solution A had a coating wet weight of 25g/m 2 The coating dry weight was 8g/m 2 The first coating wet weight of the ethylene acrylic acid copolymer mixed solution B is 30g/m 2 Coating to drynessIn an amount of 4g/m 2 The second coating wet weight was 25g/m 2 The coating dry weight was 4g/m 2 The remaining amounts and steps were identical to those of example 3.
Example 5
This embodiment differs from embodiment 3 in that: the mass of beeswax added was 0.3 kg, polydimethylsiloxane 0.4 kg, polyvinyl alcohol 0.3 kg, the remainder of the amounts and steps being identical to those of example 3.
TABLE 1 amounts of raw materials used in examples 1 to 5
Table 2 coating weights of the waterproof layer and the waterproof and oil-repellent heat-seal layer in examples 1 to 5
Comparative example
Comparative example 1
This comparative example differs from example 3 in that: the equivalent amount of ethylene acrylic acid copolymer emulsion was replaced with ethylene acrylic acid ester copolymer, and the remaining amounts and steps were the same as in example 3.
Comparative example 2
This comparative example differs from example 3 in that: the coating wet weight of the ethylene acrylic acid copolymer mixture A was 20g/m 2 The coating dry weight was 6g/m 2 The first coating wet weight of the ethylene acrylic acid copolymer mixed solution B is 25g/m 2 The coating dry weight was 3g/m 2 The second coating wet weight was 20g/m 2 The coating dry weight was 3g/m 2 The remaining amounts and steps were identical to those of example 3.
Comparative example 3
This comparative example differs from example 3 in that: ethylene acrylic acidThe coating wet weight of the copolymer mixture A was 30g/m 2 The coating dry weight is 10g/m 2 The first coating wet weight of the ethylene acrylic acid copolymer mixed solution B is 35g/m 2 The coating dry weight is 5g/m 2 The second coating wet weight was 30g/m 2 The coating dry weight is 5g/m 2 The remaining amounts and steps were identical to those of example 3.
Performance test
And detecting the bonding firmness degree of the recycled environment-friendly heat-seal paper and the paper packaging box, and observing whether the recycled environment-friendly heat-seal paper is separated from the paper packaging box or not and whether the soup is leaked or not.
And (5) evaluating the recyclability of the recycled environment-friendly heat-seal paper.
Detection method/test method
The first time: and (3) carrying out heat sealing on a small amount of water-oil mixed food heated to 100 ℃ in the paper packaging box, then carrying out recycling on the environment-friendly heat sealing paper and the paper packaging box at 160 ℃, standing the paper packaging box filled with the liquid food at-20 ℃ for 2 hours, taking out the paper packaging box, standing for 2 hours at normal temperature, and observing whether the environment-friendly heat sealing paper recycled is separated from the paper packaging box or not, and repeatedly carrying out experiment detection for 3 times.
Second time: the paper package box is filled with the water-oil mixed liquid food, and then heat-sealed by a heat sealing machine at 160 ℃. After standing to normal temperature, placing the paper box under the condition of minus 20 ℃, standing for 30min, heating to 200 ℃ within 3min, heating for 30min, cooling to room temperature, observing whether the recycled environment-friendly heat-seal paper is separated from the paper packaging box or not, if no separation is realized, judging that the environment-friendly heat-seal paper is qualified, dropping the paper packaging box from a position with the height of 1.5m, observing whether the recycled environment-friendly heat-seal paper is separated from the paper packaging box or not, and if no separation is realized, judging that the environment-friendly heat-seal paper is qualified, wherein the test result is shown in the table 3:
and (3) evaluating the recyclability of the recycled environment-friendly heat-seal paper: according to CENTRAL EUROPE Grant No:4CE555P3 (Recyclability Test for Packaging Products), the recyclable environment-friendly heat-seal paper in the examples 1-5 and the comparative examples 1-3 is weighed, 480g of absolute dry sample is weighed, mixed with 40 ℃ water to be concentrated to 4%, soaked for 30min, crushed for 5min by a low-concentration pulper, screened by a 10mm sieve, subjected to ash test, sheet test, adhesive content test and handsheet manufacturing and test, and subjected to evaluation together with the recyclable environment-friendly paper purchased in a market, wherein the environment-friendly heat-seal paper is purchased from a Huimin supermarket.
GB/T742-2018 determination of paper stock, pulp, paper and board burning residues (ash);
measuring stickies in GB/T21557-2008 waste paper;
measurement of physical properties of GB/T24323-2009 pulp laboratory paper;
preparation of laboratory paper for GB/T24326-2009 pulp physical test Rapid Kaiser method, experimental data are shown in Table 7.
The evaluation was performed according to Assessment of Recyclability of Packaging Products-Recyclability Score, and the evaluation score results are shown in tables 4 and 5.
TABLE 3 Performance test data
As can be seen by combining examples 1 to 5 and comparative examples 1 to 3 and combining table 3, the environment-friendly heat-seal paper recycled by the application is used for sealing the paper packaging box, and after repeated freezing at-20 ℃, the environment-friendly heat-seal paper recycled by the application and the paper packaging box can be stably bonded, so that the environment-friendly heat-seal paper recycled by the application and the paper packaging box can keep good bonding fastness at-20 ℃; in addition, use this application cyclic utilization's environmental protection heat-seal paper to seal the paper packaging box, after freezing repeatedly at-20 ℃,3min heats to 200 ℃, cyclic utilization's environmental protection heat-seal paper and paper packaging box can stable bonding, and the environmental protection heat-seal paper and the paper packaging box that indicate cyclic utilization who this application prepared can keep good bonding fastness in-20 ~ 200 ℃ scope.
By combining the experimental results of example 4 and comparative example 1, it is demonstrated that the recycled environment-friendly heat-seal paper prepared by using the formulation of the present application has strong bonding fastness with paper packaging boxes and a wide temperature-resistant temperature range.
Table 4 ash test, sheet test, adhesive content test, handsheet manufacture and test
TABLE 5 coarse slag Rate, flake content, adhesive area and optical uniformity test results
| Coarse slag rate | Tablet content | Adhesive area | Optical uniformity | Total score | |
| Example 1 | 35 | 15 | 38.66 | 10 | 98.66 |
| Example 2 | 35 | 15 | 38.67 | 10 | 98.67 |
| Example 3 | 35 | 15 | 38.62 | 10 | 98.62 |
| Example 4 | 35 | 15 | 38.61 | 10 | 98.61 |
| Example 5 | 35 | 15 | 38.69 | 10 | 98.69 |
| Comparative example 1 | 13.65 | 12.77 | 18.45 | 10 | 54.87 |
| Comparative example 2 | 35 | 15 | 38.06 | 10 | 98.06 |
| Comparative example 3 | 35 | 15 | 37.85 | 10 | 97.85 |
| Commercially available | 26.95 | 13.79 | 17.85 | 5 | 63.59 |
It can be seen from the combination of examples 1 to 5 and comparative examples 1 to 3 and the commercially available recycled environmental protection heat seal paper and the combination of table 5 that the recycling evaluation score using the environmental protection heat seal paper of the present application was more than 98 points, the recyclability was good, the score of the environmental protection heat seal paper of comparative example 1 and the commercially available recycling was less than 70 points, and the recyclability was general.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (10)
1. An environmental protection heat-seal paper for cyclic recovery of paper packing carton, its characterized in that: the recycled environment-friendly heat-seal paper sequentially comprises a waterproof layer, a paper layer and a waterproof and oil-proof heat-seal layer, wherein the waterproof layer is formed by coating ethylene acrylic acid copolymer mixed solution A on the surface of the paper layer, and the waterproof and oil-proof heat-seal layer is formed by coating ethylene acrylic acid copolymer mixed solution B on the other surface of the paper layer;
the ethylene acrylic acid copolymer mixed solution A consists of the following raw materials in percentage by mass:
ethylene acrylic acid copolymer emulsion 20-50%
45-65% of diluent solvent
5-15% of a hydrophobizing agent;
the ethylene acrylic acid copolymer mixed solution B comprises the following components in percentage by mass:
ethylene acrylic acid copolymer emulsion 20-49%
50-75% of a diluting solvent
1-5% of an oleophobic agent.
2. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: each dilution solvent consists of 30-40% of ethanol and 60-70% of water by mass.
3. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: the hydrophobic agent is at least one of beeswax, polydimethylsiloxane, polyvinyl alcohol or stearic acid.
4. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: the oleophobic agent is at least one of polysorbate or fatty alcohol oxyvinyl ether.
5. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: the solid content of the ethylene acrylic acid copolymer emulsion is 20-35%.
6. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: the waterproof layer is formed by one-time coating, and the coating dry weight of the waterproof layer is 6-9 g/m 2 。
7. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: the waterproof and oil-proof heat-seal layer is formed by coating twice, and the dry weight of each coating of the waterproof and oil-proof heat-seal layer is 2-5 g/m 2 。
8. The environmentally friendly heat seal paper for recycling of paper packaging according to claim 1, wherein: the weight of the paper layer is 70-90 g/m 2 。
9. The method for preparing the recycled environmental-friendly heat-seal paper according to any one of claims 1 to 8, wherein the recycled environmental-friendly heat-seal paper comprises the following steps:
ethylene acrylic acid copolymer blend a: preparing and mixing ethylene acrylic acid copolymer emulsion, a diluting solvent and a hydrophobic agent according to the mass fractions of 20-50%, 45-65% and 5-15%, and uniformly stirring to obtain an ethylene acrylic acid copolymer mixed solution A;
ethylene acrylic acid copolymer mixed solution B: mixing ethylene acrylic acid copolymer emulsion, a diluting solvent and an oleophobic agent according to the mass fractions of 20-50%, 45-65% and 1-5%, and uniformly stirring to obtain an ethylene acrylic acid copolymer mixed solution B;
coating a waterproof layer: coating the prepared ethylene acrylic acid copolymer mixed solution A on the surface of the paper layer, wherein the coating wet weight of the ethylene acrylic acid copolymer mixed solution A is 20-30 g/m 2 Drying after coating, wherein the drying temperature is 95-105 ℃, and obtaining a waterproof layer;
coating a waterproof and oil-proof heat seal layer: coating the ethylene acrylic acid copolymer mixed solution B on the other surface of the paper layer, wherein the ethylene propylene copolymer mixed solution B is prepared by the following steps ofThe first coating wet weight of the acid copolymer mixed solution B is 25-35 g/m 2 And (3) drying after coating, wherein the drying temperature is 95-105 ℃, continuously coating the ethylene acrylic acid copolymer mixed solution B on the surface of the dried surface of the first coating again, wherein the second coating wet weight is smaller than the first coating wet weight, and drying after spraying, and the drying temperature is 95-105 ℃ to obtain the waterproof and oil-proof heat sealing layer.
10. The method for preparing the environment-friendly heat-seal paper for recycling of paper packaging boxes according to claim 9, which is characterized in that: when the waterproof and oil-proof heat seal layer is sprayed, the paper feeding direction of the paper layer is opposite to the rotating direction of the press roller with the ethylene acrylic acid copolymer mixed solution B adhered to the surface, namely, the coating mode of the waterproof and oil-proof heat seal layer is a reverse coating mode.
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