CN116411488A - Environment-friendly straw paper and preparation method thereof - Google Patents
Environment-friendly straw paper and preparation method thereof Download PDFInfo
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- CN116411488A CN116411488A CN202111679711.2A CN202111679711A CN116411488A CN 116411488 A CN116411488 A CN 116411488A CN 202111679711 A CN202111679711 A CN 202111679711A CN 116411488 A CN116411488 A CN 116411488A
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- 239000010902 straw Substances 0.000 title claims abstract description 121
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 121
- 238000000576 coating method Methods 0.000 claims abstract description 121
- 239000000839 emulsion Substances 0.000 claims abstract description 112
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 230000007613 environmental effect Effects 0.000 claims abstract description 16
- 239000003085 diluting agent Substances 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims description 37
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 16
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 15
- 239000006223 plastic coating Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 14
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 12
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 12
- 239000005977 Ethylene Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 7
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000376 reactant Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007761 roller coating Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 12
- 238000004064 recycling Methods 0.000 abstract description 8
- 239000000123 paper Substances 0.000 description 138
- 230000000052 comparative effect Effects 0.000 description 15
- 229920003023 plastic Polymers 0.000 description 12
- 239000004033 plastic Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 238000004537 pulping Methods 0.000 description 9
- 239000011436 cob Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 239000001993 wax Substances 0.000 description 6
- 229920006238 degradable plastic Polymers 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 239000011087 paperboard Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000009264 composting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007720 emulsion polymerization reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000011527 polyurethane coating Substances 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 241000588724 Escherichia coli Species 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 235000020965 cold beverage Nutrition 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000002761 deinking Substances 0.000 description 1
- 239000002781 deodorant agent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- JYVHOGDBFNJNMR-UHFFFAOYSA-N hexane;hydrate Chemical compound O.CCCCCC JYVHOGDBFNJNMR-UHFFFAOYSA-N 0.000 description 1
- 235000012171 hot beverage Nutrition 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 239000002352 surface water Substances 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
- D21H27/30—Multi-ply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/02—Ethene
-
- 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
- D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
-
- 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
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
- D21H21/16—Sizing or water-repelling agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/26—All layers being made of paper or paperboard
Abstract
The application relates to the technical field of straws, in particular to environment-friendly straw paper and a preparation method thereof. This environmental protection straw paper includes skin, middle level and inlayer in proper order, and the two sides of middle level all carry out the coating through plastic-free coating emulsion A, and skin and inlayer all adopt plastic-free coating emulsion B to carry out single face coating, and the one side of middle level is kept away from the coating with the skin and is had one side of plastic-free coating emulsion B and pass through the heat-seal connection, and one side of middle level with the one side that the coating was kept away from to the inlayer passes through the heat-seal connection, and plastic-free coating emulsion A is obtained by plastic-free coating emulsion B and tackifier mixture, and plastic-free coating emulsion B is obtained by the raw materials mixture of following weight percent: 50-80% of an ethylene acrylic acid copolymer emulsion with 20-50% of a diluent; the environment-friendly straw paper has the advantages of recycling and good waterproof performance.
Description
Technical Field
The application relates to the technical field of straws, in particular to environment-friendly straw paper and a preparation method thereof.
Background
The straw is a disposable article, and is generally provided with a paper straw which can be used for sucking cold drinks or hot drinks, and the paper straw is safe, sanitary, light and convenient, so that the paper straw is widely used in public places, restaurants, dining halls and the like.
Paper straws are usually prepared from PE, PP, PS, PVS, EVE and other plastics which are difficult to degrade, so that the environment is polluted; meanwhile, due to the specificity of the paper straw field, most of the paper straws are disposable articles, the paper straws are difficult to recycle and degrade, and plastic pollution is easy to cause, so that the ecological environment is influenced.
In order to solve the above problems, it has been proposed to use degradable plastics, which are prepared by PLA, PBS, PHA or PBA, but these degradable plastics are degraded for a long time and are generally treated by composting, but in the present domestic technical means, no professional composting factory in China degrades by composting, or the degradable plastics are degraded mainly naturally or are treated by incineration or burial, which is harmful to the environment, so that the use of plastics in paper straw needs to be reduced from the source.
Disclosure of Invention
In order to solve the technical problems, the application provides environment-friendly straw paper and a preparation method thereof.
In a first aspect, the present application provides an environmental protection straw paper that adopts following technical scheme:
the utility model provides an environmental protection straw paper, this environmental protection straw paper includes skin, middle level and inlayer in proper order, the two sides of middle level all are through the coating of no plastic coating emulsion A, the skin with the inlayer all adopts no plastic coating emulsion B to carry out single face coating, the one side of middle level with the one side that the coating was kept away from to the skin is no plastic coating emulsion B passes through the heat-seal connection, the one side of middle level with the one side that the coating was kept away from to the inlayer is passed through the heat-seal connection, no plastic coating emulsion A is obtained by no plastic coating emulsion B and tackifier mixture, no plastic coating emulsion B is obtained by the raw materials mixture of following weight percent:
20 to 50 percent of ethylene acrylic acid copolymer emulsion
50-80% of diluent.
Through the technical scheme, the ethylene acrylic acid copolymer emulsion has the advantage of good waterproof performance after coating and curing, so that the environment-friendly straw paper has waterproof performance; the ethylene acrylic acid copolymer emulsion is diluted by the dilution effect of the diluent, so that the ethylene acrylic acid copolymer emulsion B is easy to disperse when being coated, the coating efficiency is improved, and the diluent is quickly evaporated after being coated and the ethylene acrylic acid copolymer emulsion is solidified; because the plastic-free coating emulsion B does not contain plastic, the obtained environment-friendly straw paper is easy to degrade, and the environment-friendly paper prepared by the environment-friendly straw paper can be degraded.
Further, the outer layer was 58g/m 2 The middle layer of glassine paper is 83g/m 2 (Soxhlet) TM Extra solid, 83 g) with an outer layer of 90g/m 2 The environment-friendly straw paper formed by the paper has better strength, is not easy to bend or break when used for manufacturing the paper straw, is easy to pulp, forms paper pulp with uniform dispersion, and is favorable for recycling the paper straw.
At present, common straw paper is made of plastic or degradable plastic, and the raw materials of the coated paper are other additives and auxiliary agents besides the plastic or the degradable plastic, when the recycled straw paper is pulped, because the plastic is incompatible with the paper, and the plastic is easy to agglomerate/block-shaped solid in the pulping process, the obtained slurry is unfavorable for recycling, and recycling of the straw paper cannot be realized.
And what the environmental protection straw paper of this application adopted is that ethylene acrylic acid copolymer emulsion cooperates the diluent to coat and obtains, and the raw materials of this environmental protection straw paper is simple, convenient to use just does not contain plastics for after the environmental protection straw paper of retrieving pulped, form the thick liquids of dispersion even, the environmental protection straw paper of being convenient for can carry out recycle, this environmental protection straw paper retrieves the method does: the environment-friendly straw paper is put into a pulverizer to be pulverized, then is put into a pulping machine to be pulped to form pulp, and the obtained pulp is used for producing shoe support paper, printing paper, carton paper and the like, so that the environment-friendly straw paper can be recycled.
Preferably, the diluent is obtained by mixing the following raw materials in percentage by weight:
ethanol 20-60%
40-80% of water.
The mass fraction of the raw materials and the raw materials is in the preferred raw material composition and raw material mass fraction range, the formed diluent can dilute the ethylene acrylic acid copolymer emulsion, the dispersibility of the ethylene acrylic acid copolymer emulsion is improved, the obtained plastic-free coating emulsion B is easier to coat, the coating efficiency of the plastic-free coating emulsion B is improved, the processing efficiency of plastic-free coating is further improved, and when the plastic-free coating emulsion is dried, water and ethanol volatilize, the coating plastic-free coating emulsion only contains the ethylene acrylic acid copolymer, when the environment-friendly straw paper is recycled and pulped, the ethylene acrylic acid copolymer is easy to disperse in the slurry, the obtained slurry can be recycled, and the environment-friendly straw paper has the advantage of recycling, so that the environment-friendly straw paper is enabled.
Preferably, the ethylene acrylic acid copolymer emulsion is prepared by the following method:
step 1: weighing 0.05-0.08 part of sodium persulfate and 50-80 parts of polyvinyl alcohol solution with the mass fraction of 1-3% according to parts by weight, and uniformly mixing to obtain a mixture A for later use; weighing 5-15 parts of acrylic acid, 0.05-0.1 part of dodecyl mercaptan and 200-300 parts of 12-15% isopropyl alcohol solution by mass fraction, uniformly mixing, and vacuumizing to obtain a mixed solution B;
step 2: introducing ethylene, pressurizing to 5-6Mpa, heating to 75-90 ℃, adding the mixture A obtained in the step 1 for 2-3 times, reacting for 40-60min after adding the mixed liquid A each time, enabling the pressure to be 15-18Mpa after adding the mixed liquid A completely, continuing the reaction, continuously taking out reactants in the reaction process to test the solid content, stopping introducing ethylene when the solid content reaches 20-22%, and cooling to obtain the ethylene acrylic acid copolymer emulsion.
According to the technical scheme, the added sodium persulfate is used as an initiator to promote emulsion polymerization of acrylic acid and ethylene, the polyvinyl alcohol solution is used as an emulsifier to enable the emulsion polymerization to be carried out stably, and the dodecyl mercaptan is used as a transfer agent to control the molecular weight of the emulsion polymerization reaction; through mixing sodium persulfate with a polyvinyl alcohol solution, the ammonium persulfate is uniformly dispersed in the polyvinyl alcohol solution, and then the mixture A is added for times, so that the ethylene and the acrylic acid react more thoroughly, byproducts are reduced, the obtained ethylene acrylic acid copolymer emulsion has the advantages of good adhesion and no plastics, and the ethylene acrylic acid copolymer emulsion has better waterproof performance after being coated and cured, so that the obtained environment-friendly straw paper has the advantages of good waterproof performance and degradability.
Preferably, the plastic-free coating emulsion A comprises the plastic-free coating emulsion B and tackifier in a weight percentage ratio of 9:1, wherein the tackifier is acrylic acid.
Since the ethylene acrylic acid copolymer in the ethylene acrylic acid copolymer emulsion is a polymer having thermoplasticity and extremely high adhesion, crystallization of the polymer is suppressed due to the presence of carboxyl groups and the effect of hydrogen bonding, and when acrylic acid is added, acrylic acid in the ethylene acrylic acid copolymer emulsion increases, so that the adhesion and environmental stress cracking resistance of the ethylene acrylic acid copolymer increases; and the adhesiveness of the acrylic copolymer emulsion is enhanced, so that the connection between the middle layer and the inner layer and between the middle layer and the outer layer are enhanced, the connection firmness among the outer layer, the middle layer and the inner layer of the environment-friendly straw paper is improved, and the possibility of cracking of the environment-friendly straw paper is reduced.
Preferably, the tackifier is obtained by mixing the following raw materials in percentage by weight:
acrylic acid 50-80%
20-50% of wax slurry.
The wax slurry can improve the glass transition temperature of the plastic-free coating emulsion A, so that the plastic-free coating emulsion A is quickly cured, the curing efficiency of coating is improved, the adhesion of the plastic-free coating emulsion A can be enhanced through the acrylic acid, and the connection among the outer layer, the middle layer and the inner layer of the environment-friendly straw paper is more stable after heat sealing.
In a second aspect, the preparation method of the environment-friendly straw paper adopts the following technical scheme:
the preparation method of the environment-friendly straw paper comprises the following steps:
the coating operation, namely adopting a reverse roller coating mode to transmit the middle layer to two rollers which move oppositely, carrying out double-sided coating on the plastic-free coating emulsion A, and drying the plastic-free coating emulsion A; coating one side of the outer layer and one side of the inner layer by using a plastic-free coating emulsion B, and drying the plastic-free coating emulsion B;
and (3) pressing and pasting, namely abutting one surface of the middle-layer coating plastic-free coating emulsion A with one surface of the inner layer, which is far away from the coating plastic-free coating emulsion B, abutting the other surface of the middle-layer coating plastic-free coating emulsion A with one surface of the outer layer, which is far away from the coating plastic-free coating emulsion B, and performing heat sealing to obtain the environment-friendly straw paper.
The method for preparing the environment-friendly straw paper has the advantages of simple operation and high production efficiency, and the plastic-free coating emulsion A is used for curing and heating the sealing paste, so that the outer layer, the middle layer and the inner layer of the environment-friendly straw paper are tightly connected, and the environment-friendly straw paper with stable connection is formed; and the environment-friendly straw paper can be used within the range of-30 to 100 ℃.
Preferably, the heat-sealing temperature is 130-160 ℃, and the heat-sealing time is 0.2-2s.
Under this heat-seal scope and heat-seal temperature range, can make the quick solidification of no plastic coating emulsion A, make the tight connection between the skin of environmental protection straw paper, middle level and the inlayer, form the stable in structure's straw paper of protecting for straw paper of protecting has recycle, waterproof performance is good and degradable advantage.
Preferably, the wet weight of the middle layer coating plastic-free coating emulsion A is 15-25g/m 2 The dry weight of the middle layer coating plastic-free coating emulsion A is 5-7g/m 2 The moisture and dry weight are within the preferred ranges herein, when the moisture is less than 15g/m 2 When the thickness of the coating is too low, the connectivity to the inner layer and the outer layer is insufficient, and the compactness of the environment-friendly straw paper is affected; when the coating amount is more than 25g/m 2 In the process, the usage amount of the coating emulsion A for coating the plastic-free coating is excessive, and the cost is high.
Preferably, the wet weight of the outer layer coating non-plastic coating emulsion B and the wet weight of the inner layer coating non-plastic coating emulsion B are 15-25g/m 2 。
The above moisture content is within the preferred moisture content range of the present application when the moisture content is less than 15g/m 2 When the coating thickness is too low, the temperature resistant effect is poor, leakage is easy to occur, and the waterproof performance of the environment-friendly straw paper is affected; when the coating amount is more than 25g/m 2 In this case, the amount of the coating emulsion B is too large, and the cost is high.
Preferably, the dry weight of the outer layer coating non-plastic coating emulsion B and the dry weight of the inner layer coating non-plastic coating emulsion B are 3-5g/m 2 The above moisture content is in the preferred dry weight range of the present application.
In summary, the present application has the following beneficial effects:
1. the ethylene acrylic acid copolymer emulsion is adopted, the ethylene acrylic acid copolymer emulsion has the advantages of no plastic, good adhesion, easiness in processing and the like, and the ethylene acrylic acid copolymer emulsion has good waterproof performance after being solidified, so that the obtained environment-friendly straw paper has the advantages of being degradable, easy to recycle, good in waterproof performance, and can be uniformly dispersed in paper pulp due to the fact that the ethylene acrylic acid copolymer emulsion can be used for pulping to obtain uniformly dispersed pulp after recycling the environment-friendly straw paper, and the pulp can be used for producing paper boxes and the like, and further the environment-friendly straw paper can be recycled, so that the paper straw manufactured through the environment-friendly straw paper has the advantages of being good in waterproof performance, recycling, degradable and the like.
2. According to the preparation method of the ethylene acrylic acid copolymer emulsion, the mixture A is added in a divided manner, so that the mixture A is fully mixed with other raw materials, the emulsion is more thorough in reaction, byproducts are reduced, the reaction is accelerated, the ethylene acrylic acid copolymer emulsion does not contain plastics, the obtained environment-friendly straw paper is easier to degrade, and meanwhile, when the paper straw made of the environment-friendly straw paper is recycled and pulped, the ethylene acrylic acid copolymer is easy to disperse in pulped slurry, so that the slurry is easy to be used for producing paper shoe struts and the like, and the environment-friendly straw paper has the advantage of recycling.
3. The preparation method has the advantages of simplicity in operation and high production efficiency of the environment-friendly straw paper.
Detailed Description
The following preparation examples, examples and application examples are described in further detail.
Partial sources of raw materials:
wax slurry, manufacturer: longkou city, model:
w130, product name: w-130 paraffin wax/synthetic wax emulsion wax water wax slurry;
ethylene acrylic acid copolymer emulsion (commercially available), brand: DOW/Dow.
Preparation example ethylene acrylic acid copolymer emulsion preparation example
Preparation example 1
The ethylene acrylic acid copolymer emulsion is prepared by the following method:
step 1: weighing 8g of sodium persulfate and 8000g of polyvinyl alcohol solution with the mass fraction of 3%, and uniformly mixing to obtain a mixture A for later use; weighing 1500g of acrylic acid, 10g of dodecyl mercaptan and 30000g of 15% isopropyl alcohol solution by mass fraction, putting into a reaction kettle, uniformly mixing, and vacuumizing when a vacuum gauge points to-0.1 to obtain a mixed solution B;
step 2: introducing ethylene into a reaction kettle until the pressure is 6Mpa, heating to 90 ℃, pumping the mixture A obtained in the step 1 for 3 times, reacting for 60 minutes after pumping the mixture A each time, fully adding the mixture A, enabling the pressure to be 18Mpa, continuously taking out reactants in the reaction process to test the solid content, stopping introducing ethylene when the solid content reaches 22%, and cooling to obtain the ethylene acrylic acid copolymer emulsion.
Preparation example 2
The ethylene acrylic acid copolymer emulsion is prepared by the following method:
step 1: weighing 6g of sodium persulfate and 6000g of polyvinyl alcohol solution with mass fraction of 2%, and uniformly mixing to obtain a mixture A for later use; 1000g of acrylic acid, 8g of dodecyl mercaptan and 25000g of 13% isopropyl alcohol solution by mass fraction are weighed, put into a reaction kettle, uniformly mixed, and vacuumized when a vacuum gauge points to-0.1, so as to obtain a mixed solution B;
step 2: introducing ethylene into a reaction kettle until the pressure is 5.5Mpa, heating to 85 ℃, pumping the mixture A obtained in the step 1 for 3 times, reacting for 40min after pumping the mixture A each time, fully adding the mixture A, enabling the pressure to be 15Mpa, continuing to react for 2.5h, continuously taking out reactants in the reaction process to test the solid content, stopping introducing ethylene when the solid content reaches 21%, and cooling to obtain the ethylene acrylic acid copolymer emulsion.
Preparation example 3
The ethylene acrylic acid copolymer emulsion is prepared by the following method:
step 1: weighing 5g of sodium persulfate and 5000g of polyvinyl alcohol solution with mass fraction of 2%, and uniformly mixing to obtain a mixture A for later use; weighing 500g of acrylic acid, 5g of dodecyl mercaptan and 20000g of 10% isopropyl alcohol solution by mass fraction, putting into a reaction kettle, uniformly mixing, and vacuumizing when a vacuum gauge points to-0.1 to obtain a mixed solution B;
step 2: introducing ethylene into a reaction kettle until the pressure is 5Mpa, heating to 75 ℃, pumping the mixture A obtained in the step 1 for 2 times, reacting for 50min after pumping the mixture A each time, fully adding the mixture A, enabling the pressure to be 15Mpa, continuing the reaction for 2h, continuously taking out reactants in the reaction process to test the solid content, stopping introducing ethylene when the solid content reaches 20%, and cooling to obtain the ethylene acrylic acid copolymer emulsion.
Preparation of comparative example 1
The preparation comparative example 1 differs from the preparation example 2 in that: in the step 2, the mixed solution A is added at one time.
Examples
Example 1
The preparation method of the environment-friendly straw paper comprises the following steps:
the coating operation comprises the steps of adopting a reverse roller coating mode to transfer the middle layer into two rollers which move oppositely, carrying out double-sided coating on the plastic-free coating emulsion A, drying the plastic-free coating emulsion A, and enabling the coating wet weight to be 20g/m 2 The dry weight of the coating was 6g/m 2 The drying temperature is 60 ℃; coating one side of the outer layer and one side of the inner layer with a plastic-free coating emulsion B, and drying the plastic-free coating emulsion B, wherein the coating wet weight is 20g/m 2 The dry weight of the coating was 4g/m 2 The drying temperature is 60 ℃;
and (3) pressing and pasting, namely abutting one surface of the middle layer coating plastic-free coating emulsion A with one surface of the inner layer far away from the coating plastic-free coating emulsion B, abutting the other surface of the middle layer coating plastic-free coating emulsion A with one surface of the outer layer far away from the coating plastic-free coating emulsion B, and performing heat sealing, wherein the heat sealing temperature is 150 ℃ and the heat sealing time is 1s, so that the environment-friendly straw is obtained.
Examples 2 to 7
Examples 2 to 7 differ from example 1 in the amounts of raw materials used, the coating amounts and the dry amounts of the plastic-free coating emulsion B and the plastic-free coating emulsion A;
TABLE 1 examples 1-7 Plastic-free coating emulsion B the amounts (Kg), coating weights, dry weights of the respective raw materials
TABLE 2 amounts of raw materials (Kg), coating weight, dry weight in examples 1-7 Plastic-free coating emulsion B
Comparative example
Comparative example 1
Comparative example 1 differs from example 3 in that: the ethylene acrylic acid copolymer emulsion was replaced equally with an aqueous polyurethane.
Comparative example 2
Comparative example 1 differs from example 3 in that: the ethylene acrylic acid copolymer emulsion was replaced with an equivalent amount of aliphatic-aromatic polyester.
Performance test
The environmental-friendly straw papers obtained in examples 1 to 7 and comparative examples 1 to 2 were subjected to performance test.
Test method
1. Degradation rate
3. According to the national standard, according to GB/T20197-2006, degradation tests are carried out, after the environment-friendly straw paper prepared in examples 1-7 and application examples 1-2 is buried in soil for 90 days, detection is carried out, and when the degradation rate reaches more than 90%, the environment-friendly straw paper is a degradable material.
2. Waterproof property
3. According to national standard GB/T1540-2002, soaking is carried out for 30min, and the COBB value is below 5g (COBB is a conventional instrument for testing the surface water absorption of paper and paperboard, and is also called a paper surface absorption gravimeter).
3. Sanitary index
Detecting fluorescence examination, decolorizing test and Escherichia coli according to national standard GB/T5009.78-2006, wherein the fluorescence test is 100cm 2 The paper pattern of the fluorescent material is tested, and the maximum fluorescence area is not more than 5cm 2 For qualification, dehydration test, namely, water and normal hexane soaking solution cannot be dyed to be qualified, and the escherichia coli: if no colibacillus is qualified, and the three are qualified, the sanitation index is qualified, and the test result is shown in table 2;
TABLE 2 test data for examples 1-7 and comparative examples 1-2
| COBB(g) | Degradation rate (%) | Sanitary index | |
| Comparative example 1 | 5.5 | 65.1 | Qualified product |
| Comparative example 2 | 5.8 | 77.3 | Qualified product |
| Example 1 | 4.1 | 93.2 | Qualified product |
| Example 2 | 3.8 | 94.2 | Qualified product |
| Example 3 | 4.2 | 93.1 | Qualified product |
| Example 4 | 4.6 | 92.3 | Qualified product |
| Example 5 | 4.7 | 91.6 | Qualified product |
| Example 6 | 4.5 | 93.8 | Qualified product |
| Example 7 | 4.4 | 92.9 | Qualified product |
As can be seen from the combination of example 3 and comparative examples 1-2 and the combination of table 2, the COBB of example 3 is smaller than the COBB value of comparative examples 1-2, and the degradability of example 3 is higher than that of comparative examples 1-2, indicating that the environmental-friendly straw paper obtained using the ethylene acrylic acid copolymer of example 3 has good water-repellency and high degradability than that obtained using the aqueous polyurethane and the aliphatic-aromatic polyester, and the environmental-friendly straw paper obtained by the environmental-friendly straw paper has good water-repellency and high degradability.
As can be seen from the combination of example 3 and example 1 and the table 2, the COBB value of example 3 is smaller than that of example 2, and the degradability of example 3 is higher than that of comparative example 2, which shows that the environment-friendly straw paper obtained using the ethylene acrylic acid copolymer prepared in this application of example 3 is easier to dissolve and degrade and waterproof than the environment-friendly straw paper obtained using the commercially available ethylene acrylic acid copolymer, so that the environment-friendly straw paper obtained by the environment-friendly straw paper has good waterproof performance and high degradability.
4. Recyclable
Making the environment-friendly straw paper obtained in the examples 1-7 into an environment-friendly paper straw;
(1) The environment-friendly paper straw prepared in examples 1 to 7, the paper straw prepared in PLA, the paper straw prepared in PE, the paper straw prepared in aqueous polyurethane coating and the paper straw prepared in PBA were recycled and pulped in the following manner: firstly, respectively placing the environment-friendly paper straw prepared in the embodiments 1-7, the paper straw prepared by PLA, the paper straw prepared by PE, the paper straw prepared by aqueous polyurethane coating and the paper straw prepared by PBA into a pulverizer for pulverizing to obtain paper scraps; putting the paper scraps into a deinking pond, adding a release agent to completely soak the paper scraps, removing ink on the paper scraps, putting the paper scraps after removing the ink into a pulping machine for pulping for 30min, and enabling the paper scraps to be formed into a paddle shape, wherein the ratio of water to the paper scraps is 3:1; the pulping temperature is 50 ℃, and the slurry is obtained.
The dispersion of the slurry was observed and the slurry was screened through a 50 mesh screen and the relevant data recorded as shown in table 3;
TABLE 3 dispersion of the slurry and sieving of 50 mesh
| Test item | Dispersion situation | Sieving with 50 mesh sieve |
| Environment-friendly paper straw prepared in example 1 | Uniformly disperse | All the slurry passes through |
| Environment-friendly paper straw prepared in example 2 | Uniformly disperse | All the slurry passes through |
| Environment-friendly paper straw prepared in example 3 | Uniformly disperse | All the slurry passes through |
| Environment-friendly paper straw prepared in example 4 | Uniformly disperse | All the slurry passes through |
| Environment-friendly paper straw prepared in example 5 | Uniformly disperse | All the slurry passes through |
| Environment-friendly paper straw prepared in example 6 | Uniformly disperse | All the slurry passes through |
| Environment-friendly paper straw prepared in example 7 | Uniformly disperse | All the slurry passes through |
| Paper straw made of PLA | With a small amount of solids | Not pass through completely |
| Paper straw made of PE | With a small amount of solids | Not pass through completely |
| Paper straw made by coating aqueous polyurethane | Agglomeration of the slurry occurs | Not pass through completely |
| Paper straw made of PBA | With a small amount of solids | Not pass through completely |
From the above table, it can be seen that the pulped slurry of the environmental protection paper straw prepared in examples 1 to 7 was uniformly dispersed and all could pass through the 50 mesh sieve, the pulped slurry of the paper straw prepared in PLA, the pulped slurry of the paper straw prepared in PE and the pulped slurry of the paper straw prepared in PBA had a small amount of solids and failed to pass through the 50 mesh sieve, and the pulped slurry of the paper straw prepared in aqueous polyurethane coating had agglomerated and failed to pass through the 50 mesh sieve.
(2) The slurry obtained by the pulping method in (1) of the environment-friendly paper straw prepared in the examples 1-7 is used for preparing a paper shoe stretcher, and the paper shoe stretcher is obtained by the following method:
step I: crushing 5Kg of recovered environment-friendly straw paper and 1.6Kg of deodorant by using a crusher, adding 50Kg of water and 0.7Kg of cationic starch, and soaking for 2 hours to obtain a mixture;
step II: pulping the mixture by using a pulping machine to obtain pulp, carrying out papermaking on the pulp by using a papermaking machine, and drying at 50 ℃ to obtain a paperboard with the thickness of 2.5mm; and then carrying out heat sealing forming on the paperboard by using a die, wherein the die comprises an upper die and a lower die, the upper die is positioned right above the lower die, the temperature of the upper die and the lower die is 70 ℃, an operator places the paperboard on the lower surface of the lower die, and then the upper die moves downwards to carry out heat sealing forming on the paperboard so as to obtain the paper shoe stretcher.
Inserting the paper shoe stretcher into the shoe, standing for 30 days, taking out to observe whether the paper shoe stretcher has mildew spots or not and whether the smellless shoe is odorous or not, wherein the data are shown in Table 4;
table 4 data relating to the paper shoe stretcher and the commercially available paper shoe stretcher made from the slurries of examples 1-7
| Test item | Paper shoe stretcher surface | Shoes with wheels |
| Commercial paper shoe stretcher | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 1 | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 2 | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 3 | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 4 | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 5 | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 6 | No mildew spot | No bad smell |
| Paper shoe stretcher made of the slurry of example 7 | No mildew spot | No bad smell |
The surface of the paper shoe stretcher prepared from the slurry in the embodiments 1-7 has no mildew spots, and the shoe containing the paper shoe stretcher has no peculiar smell, so that the environment-friendly straw paper can be recycled.
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. The utility model provides an environmental protection straw paper, this environmental protection straw paper includes skin, middle level and inlayer in proper order, its characterized in that: the two sides of the middle layer are coated by the plastic-free coating emulsion A, the outer layer and the inner layer are coated by the plastic-free coating emulsion B, one side of the middle layer is connected with one side of the outer layer far away from the plastic-free coating emulsion B through heat sealing, one side of the middle layer is connected with one side of the inner layer far away from the plastic-free coating emulsion B through heat sealing, the plastic-free coating emulsion A is obtained by mixing the plastic-free coating emulsion B with a tackifier, and the plastic-free coating emulsion B is obtained by mixing the following raw materials in percentage by weight:
ethylene acrylic acid copolymer emulsion 20-50%
50-80% of diluent.
2. The environment-friendly straw paper according to claim 1, wherein the diluent is obtained by mixing the following raw materials in percentage by weight:
ethanol 20-60%
40-80% of water.
3. The environmental protection straw paper according to claim 1, wherein the ethylene acrylic acid copolymer emulsion is prepared by the following method:
step 1: weighing 0.05-0.08 part of sodium persulfate and 50-80 parts of polyvinyl alcohol solution with the mass fraction of 1-3% according to parts by weight, and uniformly mixing to obtain a mixture A for later use; weighing 5-15 parts of acrylic acid, 0.05-0.1 part of dodecyl mercaptan and 200-300 parts of 12-15% isopropyl alcohol solution by mass fraction, uniformly mixing, and vacuumizing to obtain a mixed solution B;
step 2: introducing ethylene, pressurizing to 5-6Mpa, heating to 75-90 ℃, adding the mixture A obtained in the step 1 for 2-3 times, reacting for 40-60min after adding the mixed liquid A each time, enabling the pressure to be 15-18Mpa after adding the mixed liquid A completely, continuing the reaction, continuously taking out reactants in the reaction process to test the solid content, stopping introducing ethylene when the solid content reaches 20-22%, and cooling to obtain the ethylene acrylic acid copolymer emulsion.
4. An environmental protection straw paper according to claim 1, characterized in that: the plastic-free coating emulsion A comprises a plastic-free coating emulsion B and a tackifier in a weight percentage ratio of 9:1, wherein the tackifier is acrylic acid.
5. An environmental protection straw paper according to claim 1, characterized in that: the tackifier is obtained by mixing the following raw materials in percentage by weight:
acrylic acid 50-80%
20-50% of wax slurry.
6. A method for preparing the environment-friendly straw paper according to any one of claims 1 to 5, comprising the following steps:
the coating operation, namely adopting a reverse roller coating mode to transmit the middle layer to two rollers which move oppositely, carrying out double-sided coating on the plastic-free coating emulsion A, and drying the plastic-free coating emulsion A; coating one side of the outer layer and one side of the inner layer by using a plastic-free coating emulsion B, and drying the plastic-free coating emulsion B;
and (3) pressing and pasting, namely abutting one surface of the middle-layer coating plastic-free coating emulsion A with one surface of the inner layer, which is far away from the coating plastic-free coating emulsion B, abutting the other surface of the middle-layer coating plastic-free coating emulsion A with one surface of the outer layer, which is far away from the coating plastic-free coating emulsion B, and performing heat sealing to obtain the environment-friendly straw paper.
7. The method for preparing the environment-friendly straw paper according to claim 6, which is characterized in that: the wet weight of the middle layer coating plastic-free coating emulsion A is 15-25g/m 2 The dry weight of the middle layer coating plastic-free coating emulsion A is 5-7g/m 2 。
8. The method for preparing the environment-friendly straw paper according to claim 6, which is characterized in that: the wet weight of the outer layer coating non-plastic coating emulsion B and the wet weight of the inner layer coating non-plastic coating emulsion B are 15-25g/m 2 。
9. The method for preparing the environment-friendly straw paper according to claim 6, which is characterized in that: the dry weight of the outer layer coating non-plastic coating emulsion B and the dry weight of the inner layer coating non-plastic coating emulsion B are 3-5g/m 2 。
10. The method for preparing the environment-friendly straw paper according to claim 6, which is characterized in that: the heat sealing temperature is 130-160 ℃, and the heat sealing time is 0.2-2s.
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