CN114525082A - Cotton coating film and preparation method thereof - Google Patents
Cotton coating film and preparation method thereof Download PDFInfo
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- CN114525082A CN114525082A CN202210192076.3A CN202210192076A CN114525082A CN 114525082 A CN114525082 A CN 114525082A CN 202210192076 A CN202210192076 A CN 202210192076A CN 114525082 A CN114525082 A CN 114525082A
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- polyethylene
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 82
- 239000011248 coating agent Substances 0.000 title claims abstract description 51
- 238000000576 coating method Methods 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000010410 layer Substances 0.000 claims abstract description 76
- -1 polyethylene Polymers 0.000 claims abstract description 68
- 239000004698 Polyethylene Substances 0.000 claims abstract description 62
- 229920000573 polyethylene Polymers 0.000 claims abstract description 62
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 21
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 19
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 17
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 17
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 16
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 16
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 16
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 15
- 239000012790 adhesive layer Substances 0.000 claims abstract description 15
- 239000004595 color masterbatch Substances 0.000 claims abstract description 9
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000000071 blow moulding Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 8
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 229940124543 ultraviolet light absorber Drugs 0.000 claims description 7
- 230000003078 antioxidant effect Effects 0.000 claims description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 5
- 239000006057 Non-nutritive feed additive Substances 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003381 stabilizer Substances 0.000 claims description 4
- 238000010096 film blowing Methods 0.000 claims description 3
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 3
- 239000000326 ultraviolet stabilizing agent Substances 0.000 claims description 3
- OLFNXLXEGXRUOI-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-bis(2-phenylpropan-2-yl)phenol Chemical compound C=1C(N2N=C3C=CC=CC3=N2)=C(O)C(C(C)(C)C=2C=CC=CC=2)=CC=1C(C)(C)C1=CC=CC=C1 OLFNXLXEGXRUOI-UHFFFAOYSA-N 0.000 claims description 2
- ZSSVCEUEVMALRD-UHFFFAOYSA-N 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octyloxy)phenol Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C1=NC(C=2C(=CC(C)=CC=2)C)=NC(C=2C(=CC(C)=CC=2)C)=N1 ZSSVCEUEVMALRD-UHFFFAOYSA-N 0.000 claims description 2
- WPMYUUITDBHVQZ-UHFFFAOYSA-M 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=CC(CCC([O-])=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-M 0.000 claims description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 2
- XITRBUPOXXBIJN-UHFFFAOYSA-N bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate Chemical compound C1C(C)(C)NC(C)(C)CC1OC(=O)CCCCCCCCC(=O)OC1CC(C)(C)NC(C)(C)C1 XITRBUPOXXBIJN-UHFFFAOYSA-N 0.000 claims description 2
- JMFYZMAVUHNCPW-UHFFFAOYSA-N dimethyl 2-[(4-methoxyphenyl)methylidene]propanedioate Chemical compound COC(=O)C(C(=O)OC)=CC1=CC=C(OC)C=C1 JMFYZMAVUHNCPW-UHFFFAOYSA-N 0.000 claims description 2
- 239000004811 fluoropolymer Substances 0.000 claims description 2
- 229920002313 fluoropolymer Polymers 0.000 claims description 2
- 230000009477 glass transition Effects 0.000 claims description 2
- KDYFGRWQOYBRFD-UHFFFAOYSA-L succinate(2-) Chemical compound [O-]C(=O)CCC([O-])=O KDYFGRWQOYBRFD-UHFFFAOYSA-L 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims 1
- LGOPTUPXVVNJFH-UHFFFAOYSA-N pentadecanethioic s-acid Chemical compound CCCCCCCCCCCCCCC(O)=S LGOPTUPXVVNJFH-UHFFFAOYSA-N 0.000 claims 1
- 239000002313 adhesive film Substances 0.000 abstract description 11
- 239000012785 packaging film Substances 0.000 abstract description 10
- 229920006280 packaging film Polymers 0.000 abstract description 10
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 235000006708 antioxidants Nutrition 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 241000282994 Cervidae Species 0.000 description 1
- 229920010126 Linear Low Density Polyethylene (LLDPE) Polymers 0.000 description 1
- 241001124569 Lycaenidae Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- VSVVZZQIUJXYQA-UHFFFAOYSA-N [3-(3-dodecylsulfanylpropanoyloxy)-2,2-bis(3-dodecylsulfanylpropanoyloxymethyl)propyl] 3-dodecylsulfanylpropanoate Chemical compound CCCCCCCCCCCCSCCC(=O)OCC(COC(=O)CCSCCCCCCCCCCCC)(COC(=O)CCSCCCCCCCCCCCC)COC(=O)CCSCCCCCCCCCCCC VSVVZZQIUJXYQA-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007719 peel strength test Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
- C09J7/243—Ethylene or propylene polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J153/02—Vinyl aromatic monomers and conjugated dienes
- C09J153/025—Vinyl aromatic monomers and conjugated dienes modified
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/387—Block-copolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2453/00—Presence of block copolymer
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of self-adhesive films, in particular to a cotton packaging film and a preparation method thereof. The invention relates to a cotton coating film, which comprises: a polyethylene layer and an adhesive layer attached to the surface of the polyethylene layer; the adhesive layer comprises hydrogenated SBC pressure-sensitive adhesive; the polyethylene layer comprises 40-70 parts of metallocene polyethylene, 8-13 parts of linear low-density polyethylene, 15-25 parts of low-density polyethylene, 1.5-5 parts of anti-aging agent master batch, 1-5 parts of color master batch and 0.05-0.3 part of auxiliary agent in parts by weight; the mass ratio of the viscous layer to the polyethylene layer is 4-9: 91-96. Through scientific proportioning of the components and synergistic cooperation of the components, the prepared cotton coating film has excellent stripping viscosity, overlapping viscosity, uncoiling property, low temperature resistance, toughness, tensile resistance and strength.
Description
Technical Field
The invention relates to the technical field of self-adhesive films, in particular to a cotton packaging film and a preparation method thereof.
Background
With the development and improvement of the modern agricultural mechanization level, the demand of cotton packing films for cotton harvesters is increasing. At present, the cotton packing film is mainly formed by splicing an original film (without viscosity) and an adhesive film through adhesive tapes, wherein the high-performance adhesive film is a key material for determining the performance quality and the functional effect of the cotton packing film. The adhesive film acts like a winding film, and can tightly wrap cotton by utilizing the self-viscoelasticity stretching and winding of the film when in use and depending on the viscoelasticity of the surface of the film and the pulling tension when in use, thereby achieving the purposes of protecting the cotton and being convenient for transportation. The "tack" required during use of cotton wrapping films is actually both good peel adhesion and good lap adhesion. The higher the peel adhesion, the less likely to bale loose and the better the sealability of the film; the higher the lap tack, the less likely the film will be longitudinally displaced, so to achieve a strong package, particularly like a cotton bale, typically weighing around 2 tons per package and highly compressed, it is necessary to balance the peel tack and lap tack of the cotton bale film. In addition, the adhesive layer and the back layer of the self-adhesive film protective film are in close contact to generate strong adhesion tension, and a certain force is needed to separate the adhesive layer and the back layer in use, and the separation force is called unwinding force in the industry. The uncoiling performance is also an important performance of the protective film, uncoiling force can greatly influence uncoiling and splicing of the self-adhesive film, and the requirement on splicing adhesive tapes is higher. In addition, the cotton coating film is mainly used in the centralized cotton picking period of 9 to 11 months per year, the temperature difference between day and night is large, so certain requirements are also provided for the weather resistance, especially low temperature resistance, of the coating film, and the coating film is not loosened after being packaged at the low temperature of about-15 ℃. In sum, the cotton bagging film is required to have good adhesion, decoiling properties, and low temperature resistance to be suitable for mechanized harvesting, bagging, and transportation.
The present related cotton packaging film, for example, patent application with publication number CN110606276A, discloses a structural composition of a cotton packaging film, the packaging film includes an adhesive area and a non-adhesive area connected with the adhesive area, one end of the adhesive area connected with the non-adhesive area is a folding end structure bent in a "Z" shape; the patent application with the publication number of CN112141529A discloses a splicing method for cotton wrapping films, which adopts a double splicing method of adhesive tape and heat seal to improve the tensile strength, but the adhesive property of the adhesive tape is reduced in a low-temperature environment, and the situation that the wrapping films are pulled apart by pure adhesive tapes is likely to happen.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a cotton coating film which has excellent stripping viscosity, lap joint viscosity, uncoiling property, low temperature resistance and mechanical property.
The second purpose of the invention is to provide a preparation method of the cotton coating film, which has high efficiency and low cost.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a cotton coating film, which comprises: a polyethylene layer and an adhesive layer attached to the surface of the polyethylene layer;
the adhesive layer comprises hydrogenated SBC pressure-sensitive adhesive;
the polyethylene layer comprises, by weight, 40-70 parts of metallocene polyethylene, 8-13 parts of linear low-density polyethylene, 15-25 parts of low-density polyethylene, 1.5-5 parts of an anti-aging agent master batch, 1-5 parts of a color master batch and 0.05-0.3 part of an auxiliary agent;
the mass ratio of the adhesive layer to the polyethylene layer is 4-9: 91-96.
The invention also provides a preparation method of the cotton coating film, which comprises the following steps: and respectively mixing the raw materials of each layer uniformly and then blow-molding.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, specific hydrogenated SBC pressure-sensitive adhesive, polyethylene with different properties, anti-aging master batch, color master batch and auxiliary agent are adopted, and through scientific proportioning of the components, the components are cooperated, and the thickness of the cotton coating film is controlled, so that the prepared cotton coating film has excellent stripping viscosity, lap joint viscosity, uncoiling property and low temperature resistance, and also has excellent mechanical properties such as toughness, tensile resistance and strength; the cotton bale can be used for packing cotton, can bear the rebound force and gravity of the compressed cotton, and can not be scattered in the transportation process.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following detailed description, but those skilled in the art will understand that the following described examples are some, not all, of the examples of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following describes a cotton coating film and a preparation method thereof in an embodiment of the invention.
In some embodiments of the present invention there is provided a cotton coating film comprising: a polyethylene layer and an adhesive layer attached to the surface of the polyethylene layer;
the adhesive layer comprises hydrogenated SBC pressure-sensitive adhesive;
the polyethylene layer comprises 40-70 parts by weight of metallocene polyethylene, 8-13 parts by weight of linear low-density polyethylene, 15-25 parts by weight of low-density polyethylene, 1.5-5 parts by weight of anti-aging agent master batch, 1-5 parts by weight of color master batch and 0.05-0.3 part by weight of auxiliary agent;
the mass ratio of the viscous layer to the polyethylene layer is 4-9: 91-96.
According to the cotton coating film, the specific hydrogenated SBC pressure-sensitive adhesive and the polyethylenes with different properties are adopted, and the components are matched in a synergistic manner through scientific proportioning of the components, so that the prepared cotton coating film has excellent stripping viscosity, lap joint viscosity, uncoiling property and low temperature resistance, and also has excellent mechanical properties such as toughness, tensile resistance and strength.
According to the invention, Polyethylene (PE) with different properties is mixed for use, especially metallocene polyethylene (metallocene PE), so that the mechanical properties of the cotton coating film are greatly improved, and the color of the cotton coating film can be changed and the weather resistance and the processability are improved by matching with the use of the color master batch, the anti-aging agent master batch and the processing aid.
The cotton packaging film belongs to self-adhesive films, and the self-adhesive film is mainly used for building materials such as stainless steel plates, plastic plates and the like, and in the industries of household appliances and electronics; the protective agent is used for protecting a vulnerable surface and temporarily protecting the surface of a protected substrate in the processes of production, processing, transportation and storage; the self-adhesive film prepared by the invention can be used for cotton packaging, the application range of the self-adhesive film is expanded, and the mechanical harvesting of cotton is promoted.
In some embodiments of the invention, the parts by weight of metallocene polyethylene, for example, can be, typically but not by way of limitation, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, or 70 parts, and the like; the parts by weight of the linear low density polyethylene, which is typical but not limiting, may be, for example, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, or 13 parts, etc.; parts by weight of low density polyethylene, which is typical but not limiting, may be, for example, 15 parts, 17 parts, 19 parts, 21 parts, 23 parts, 25 parts, or the like; the parts by weight of the age resistor master batch, which are typical but not limiting, may be, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts, etc.; the parts by weight of the color concentrate, which are typical but not limiting, may be, for example, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts, etc.; the weight parts of the auxiliaries, which are typical but not limiting, may be, for example, 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, or 0.3 parts, and the like.
In some embodiments of the invention, the mass ratio of adhesive layer to said polyethylene layer, typically but not limited to, may be, for example, 4: 96. 5: 95. 6: 94. 7: 93. 8: 92 or 9: 91, etc.
In some embodiments of the invention, the polyethylene layer comprises in order, in a direction away from the surface of the adhesive layer, a first polyethylene layer, a second polyethylene layer, a third polyethylene layer and a fourth polyethylene layer.
In some embodiments of the invention, the first polyethylene layer comprises 45-70 parts by weight of metallocene polyethylene, 20-50 parts by weight of low density polyethylene and 2-10 parts by weight of anti-aging master batch; preferably, the first polyethylene layer comprises 60-70 parts by weight of metallocene polyethylene, 20-30 parts by weight of low-density polyethylene and 4-6 parts by weight of anti-aging master batch.
In some embodiments of the invention, the second polyethylene layer comprises 50-80 parts by weight of metallocene polyethylene, 10-30 parts by weight of linear low density polyethylene and 5-15 parts by weight of color masterbatch; preferably, the second polyethylene layer comprises 70-80 parts by weight of metallocene polyethylene, 10-20 parts by weight of linear low density polyethylene and 8-12 parts by weight of color masterbatch.
In some embodiments of the invention, the third polyethylene layer comprises 50-80 parts by weight of metallocene polyethylene, 10-30 parts by weight of linear low density polyethylene, 2-10 parts by weight of anti-aging master batch and 0.2-1 part by weight of auxiliary agent; preferably, the third polyethylene layer comprises 65-75 parts by weight of metallocene polyethylene, 20-30 parts by weight of linear low density polyethylene, 4-6 parts by weight of anti-aging master batch and 0.2-1 part by weight of auxiliary agent.
In some embodiments of the invention, the fourth polyethylene layer comprises low density polyethylene.
In some embodiments of the invention, the mass ratio of the first, second, third and fourth polyethylene layers is from 15 to 25: 25-45: 15-30: 10-20; preferably, the mass ratio of the first polyethylene layer to the second polyethylene layer to the third polyethylene layer to the fourth polyethylene layer is 10-25: 28-32: 25-30: 15 to 20.
In a specific embodiment of the present invention, the cotton wrapping film has a five-layer structure.
In some embodiments of the invention, the thickness of the cotton coating film is 60-90 μm; typically, but not by way of limitation, the thickness of the cotton bale film is, for example, 60 μm, 70 μm, 80 μm, or 90 μm, etc.; preferably, the thickness of the cotton coating film is 70-80 μm.
The invention is beneficial to improving the mechanical property of the cotton coating film by controlling the thickness range of the cotton coating film.
In some embodiments of the invention, the hydrogenated SBC pressure sensitive adhesive has a melt flow index of 5 to 21g/10min at 190 ℃ under a load of 2.16 kg; the glass transition temperature is-15 to 5 ℃; the density is 0.91-0.94 g/cm3(ii) a Preferably, the hydrogenated SBC pressure sensitive adhesive comprises PT6705 and/or PT 7516B. PT6705 and PT7516B are trademarks of tackifying resins already in commercial use by guangzhou deer mountain new materials ltd.
According to the invention, the hydrogenated SBC pressure-sensitive adhesive bonding resin with specific performance or mark is adopted, so that the prepared cotton coating film has excellent stripping viscosity, lap joint viscosity, uncoiling property and low temperature resistance.
In some embodiments of the invention, the hydrogenated SBC pressure sensitive adhesive comprises PT6705 and PT 7516B; preferably, the mass ratio of PT6705 to PT7516B is 1: 0.1 to 0.4. Through the compound use of two hydrogenated SBC pressure-sensitive adhesive bonding resins with different performances and brands, the prepared cotton coating film has more excellent bonding performance, uncoiling performance, low temperature resistance and the like.
In some embodiments of the invention, the metallocene polyethylene has a melt flow index of 0.1 to 5g/10min at 190 ℃ under a load of 2.16 kg.
In some embodiments of the invention, the metallocene polyethylene comprises one or more of 1018, 2018, 3518, 6026, SP1540, SP2040, and SP 0540.
The metallocene polyethylene (metallocene PE) has the characteristics of good toughness, high strength and the like, and the metallocene polyethylene comprises but is not limited to EXCEED series of Exxon Mobil chemical industry, such as 1018, 2018, 3518, 6026 and the like; SP1540, SP2040, and SP0540 series of Mitsui Chemicals. The metallocene PE is added into the specific cotton coating system, so that the tensile mechanical property of the cotton coating can be greatly improved.
In some embodiments of the invention, the Low Density Polyethylene (LDPE) has a melt flow index of 0.1 to 5g/10min at 190 ℃ under a load of 2.16 kg; preferably, the low density polyethylene comprises LDPE 2420H and/or LDPE 2426H.
In some embodiments of the invention, the Linear Low Density Polyethylene (LLDPE) has a melt flow index of 0.1 to 4g/10min at 190 ℃ under a load of 2.16 kg; preferably, the linear low density polyethylene comprises LLDPE 7042 and/or LLDPE FB 2230.
In some embodiments of the invention, the additive comprises a fluoropolymer processing additive (PPA).
In some embodiments of the invention, the color concentrate is a masterbatch pellet that is a high-density color mixture pellet formulated from a resin and a large amount of pigment (up to 50%) or dye.
In some embodiments of the invention, the age resistor masterbatch includes ultraviolet light absorbers and/or stabilizers, antioxidants, and polyethylene. The anti-aging agent master batch is a master batch which takes PE as a carrier and takes an anti-oxidant and an ultraviolet light absorber and/or a stabilizer as main anti-aging components. Preferably, the mass ratio of the ultraviolet light absorber and/or stabilizer, the antioxidant and the polyethylene is 5-8: 0.5-2: 1 to 3.
In some embodiments of the invention, the antioxidant comprises one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], diethyleneglycol bis [ beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ], thioethylenebis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris (2, 4-di-tert-butylphenyl) phosphite, and pentaerythritol tetrakis (3-laurylthiopropionate).
In some embodiments of the invention, the ultraviolet light absorbers comprise dimethyl 4-methoxybenzylidenemalonate, 2- (2H-benzotriazol-2-yl) -4, 6-bis (1-methyl-1-phenylethyl) phenol, 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol, 2- (2-hydroxy-5-methyl) -benzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, poly [1- (2-hydroxy) -2,2,6, 6-tetramethyl-4-hydroxypiperidine succinate ], bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, poly- { [6- [ (1,1,3,3, -tetramethylbutyl) -amino ] -1,3,5, -triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethylpiperidyl) -imino ] -1, 6-hexanediyl- [ (2,2,6, 6-tetramethylpiperidyl) -imino ] };
in some embodiments of the invention, the stabilizer comprises bis (1,2,2,6, 6-pentamethylpiperidinol) - α - (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl- α -butyl-malonate.
In some embodiments of the present invention, there is also provided a method for preparing a cotton coating film, comprising the following steps: and respectively mixing the raw materials of each layer uniformly and then blow-molding.
In some embodiments of the invention, blow molding comprises using a multilayer coextruded blown film;
in some embodiments of the invention, the blow molding temperature is 150 to 190 ℃.
In some embodiments of the present invention, the method for preparing a cotton coating film comprises the following steps:
(A) respectively mixing the raw materials of each layer uniformly and then respectively placing the raw materials in respective corresponding bins;
(B) adjusting the temperature of a five-layer coextrusion blow molding machine, wherein the temperature of an extrusion section of a viscous layer is 150-170 ℃, the temperature of extrusion sections from a first polyethylene layer to a fourth polyethylene layer is 160-180 ℃, and the temperature of a die head is 170-200 ℃;
(C) after the temperature of the five-layer coextrusion blowing machine is stable, cleaning the five-layer coextrusion blowing machine by using a polyethylene punching machine, setting the dosage proportion and the total thickness of each layer by using an automatic material pumping and weighing system, and performing coextrusion film blowing, cooling and rolling to obtain the cotton coating film with the width of 2.8 m.
The features and properties of the present invention are described in further detail below with reference to examples.
Examples 1 to 5
The components and the content of each component of the cotton coating film provided in the embodiments 1 to 5 are shown in table 1.
TABLE 1
Note: the percentages in columns 4 to 8 of Table 1 are percentages of the component in each layer by mass.
The metallocene PE is 2018 MA;
the LDPE has a designation of 2420H;
the anti-aging agent master batch is of the brand number EV 139;
the LLDPE has a designation of 7042;
the processing aid is PPA processing aid.
The preparation method of the cotton coating film of the embodiments 1 to 5 includes the following steps:
(A) respectively and uniformly mixing the raw materials of each layer, and then respectively placing the raw materials in respective corresponding bins;
(B) and adjusting the temperature of the five-layer coextrusion blow molding machine, wherein the extrusion section temperature of the viscous layer is 160 ℃, the extrusion section temperatures of the first polyethylene layer to the fourth polyethylene layer are 170 ℃, and the temperature of the die head is 180 ℃.
(C) After the temperature of the five-layer coextrusion blowing machine is stable, cleaning the coextrusion blowing machine by using a polyethylene punching machine, setting the dosage proportion and the total thickness of each layer by using an automatic material pumping and weighing system, and performing coextrusion film blowing, cooling and rolling to obtain the cotton coating film with the width of 2.8 m.
Comparative examples 1 to 2
The comparative examples 1 and 2 provide cotton coating films whose components and contents of the components are shown in table 2.
TABLE 2
Note: the percentages in columns 4 and 5 of Table 1 are the percentages of this component in each layer by mass of each layer.
The preparation method of the cotton coating film of the comparative examples 1 and 2 is the same as that of the examples 1 to 5.
Test examples
The following tests were carried out on the cotton coating films of examples 1 to 5 and comparative examples 1 to 2, respectively, and the results are shown in Table 3.
Peel adhesion and tack test: referring to GB/T2792, the peel strength of the cotton coating film and the stainless steel substrate after being attached for 20min at room temperature and 168 hours at room temperature after being attached is measured, and the tackifying degree at room temperature for 168 hours is calculated.
Lap tack test: two cotton packaging film samples with the length of 100mm and the width of 50mm are cut, the adhesive surface of one cotton packaging film sample is attached (lapped) to the back surface of the other cotton packaging film sample, the lapping area is 30mm multiplied by 50mm, and the lapping part is smooth and has no air bubbles. Then, the laminate was rolled at 300mm/min using a 2kg standard roller. And (4) adding the two ends of the lap joint sample into a holder of an electronic tensile machine for stretching until the lap joint surface is broken. The lap tack was determined by averaging 5 samples with the maximum force from the start of stretching until the lap surface was pulled apart.
Testing tensile strength of the protective film: the tensile break strength in the Machine Direction (MD) of cotton bale films was measured with reference to GB/T1040.3-2006, and 5 samples were averaged.
And (3) unwinding force test: two cotton coating films (with the same thickness) with the width of 25mm are overlapped and attached to a standard steel plate, and then the cotton coating films are rolled and attached by a 2kg standard roller at the speed of 300 mm/min. And peeling the upper layer cotton coating film from the lower layer cotton coating film for a section, then testing according to a 180-degree peel strength test method in GB/T2792, and recording the maximum value as unwinding force.
And (3) low temperature resistance test: a cotton packaging film sample with the length of 200mm and the width of 50mm is longitudinally cut along the protective film, folded in half, pasted together with the adhesive surfaces, and the pasting area is 60mm multiplied by 50mm, and then the sample is pasted by rolling at the speed of 300mm/min by using a 2kg standard roller. After placing in a-15 ℃ low-temperature box for 2 hours, the mutually pasted adhesive surfaces are torn off in the-15 ℃ low-temperature box, and immediately and again pasted and then torn off, and whether the adhesive is sticky or not is judged. V represents stickiness; and x represents no tackiness.
TABLE 3
As can be seen from Table 3, compared with comparative examples 1 and 2, the cotton coating films of examples 1 to 4 can simultaneously take the characteristics of excellent peeling viscosity, overlapping viscosity, decoiling property, low temperature resistance, toughness, tensile resistance, strength and the like into consideration; as can be seen from comparison between the example 4 and the example 5, the two hydrogenated SBC pressure-sensitive adhesives with different performances are compounded for use, which is beneficial to improving the coating performance of cotton.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A cotton coating film is characterized by comprising: a polyethylene layer and an adhesive layer attached to the surface of the polyethylene layer;
the adhesive layer comprises hydrogenated SBC pressure-sensitive adhesive;
the polyethylene layer comprises, by weight, 40-70 parts of metallocene polyethylene, 8-13 parts of linear low-density polyethylene, 15-25 parts of low-density polyethylene, 1.5-5 parts of an anti-aging agent master batch, 1-5 parts of a color master batch and 0.05-0.3 part of an auxiliary agent;
the mass ratio of the adhesive layer to the polyethylene layer is 4-9: 91-96.
2. The cotton bale breaking membrane of claim 1, wherein the polyethylene layer comprises a first polyethylene layer, a second polyethylene layer, a third polyethylene layer and a fourth polyethylene layer in sequence in a direction away from the surface of the adhesive layer;
the first polyethylene layer comprises 45-70 parts by weight of metallocene polyethylene, 20-50 parts by weight of low-density polyethylene and 2-10 parts by weight of anti-aging master batch;
the second polyethylene layer comprises 50-80 parts by weight of metallocene polyethylene, 10-30 parts by weight of linear low density polyethylene and 5-15 parts by weight of color masterbatch;
the third polyethylene layer comprises 50-80 parts by weight of metallocene polyethylene, 10-30 parts by weight of linear low-density polyethylene, 2-10 parts by weight of anti-aging master batch and 0.2-1 part by weight of auxiliary agent;
the fourth polyethylene layer comprises low density polyethylene;
preferably, the mass ratio of the first polyethylene layer, the second polyethylene layer, the third polyethylene layer and the fourth polyethylene layer is 15-25: 25-45: 15-30: 10 to 20.
3. The cotton coating film according to claim 1, wherein the thickness of the cotton coating film is 60-90 μm.
4. The cotton coating film according to claim 1, wherein the melt flow index of the hydrogenated SBC pressure-sensitive adhesive is 5-21 g/10min at 190 ℃ under a load of 2.16 kg; the glass transition temperature is-15 to 5 ℃; the density is 0.91-0.94 g/cm3；
Preferably, the hydrogenated SBC pressure sensitive adhesive comprises PT6705 and/or PT 7516B;
preferably, the hydrogenated SBC pressure sensitive adhesive comprises PT6705 and PT 7516B;
preferably, the mass ratio of the PT6705 to the PT7516B is 1: 0.1 to 0.4.
5. The cotton coating film according to claim 2, wherein the metallocene polyethylene has a melt flow index of 0.1-5 g/10min at 190 ℃ under a load of 2.16 kg;
preferably, the metallocene polyethylene comprises one or more of 1018, 2018, 3518, 6026, SP1540, SP2040, and SP 0540;
preferably, the melt flow index of the low-density polyethylene at 190 ℃ under the condition of a load of 2.16kg is 0.1-5 g/10 min;
preferably, the linear low density polyethylene has a melt flow index of 0.1-4 g/10min at 190 ℃ under a load of 2.16 kg;
preferably, the aid comprises a fluoropolymer processing aid.
6. The cotton coating film according to claim 2, wherein the anti-aging agent master batch comprises an ultraviolet light absorber and/or stabilizer, an antioxidant and polyethylene;
preferably, the mass ratio of the ultraviolet light absorber and/or stabilizer, the antioxidant and the polyethylene is 5-8: 0.5-2: 1 to 3.
7. The cotton bale envelope of claim 6, wherein the antioxidant comprises one or more of pentaerythrityl tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], diethyleneglycol bis [ β - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ], thioethylenebis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris (2, 4-di-tert-butylphenyl) phosphite, and pentaerythrityl tetrakis (3-laurylthiopropionate).
8. The cotton decapsulation film according to claim 6, wherein the ultraviolet light absorber comprises dimethyl 4-methoxybenzylidenemalonate, 2- (2H-benzotriazol-2-yl) -4, 6-bis (1-methyl-1-phenylethyl) phenol, 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol, 2- (2-hydroxy-5-methyl) -benzotriazole, 2-hydroxy-4-n-octyloxybenzophenone, poly [1- (2-hydroxy) -2,2,6, 6-tetramethyl-4-hydroxypiperidine succinate ], (ll. said cotton decapsulation film is characterized in that, One or more of bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, poly- { [6- [ (1,1,3,3, -tetramethylbutyl) -amino ] -1,3,5, -triazine-2, 4-diyl ] [ (2,2,6, 6-tetramethylpiperidyl) -imino ] -1, 6-hexanediyl- [ (2,2,6, 6-tetramethylpiperidyl) -imino ] };
preferably, the stabilizer comprises bis (1,2,2,6, 6-pentamethylpiperidinol) - α - (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl- α -butyl-malonate.
9. The method for preparing the cotton coating film according to any one of claims 1 to 8, which is characterized by comprising the following steps: and respectively mixing the raw materials of each layer uniformly and then blow-molding.
10. The method for preparing the cotton coating film according to claim 9, wherein the blow molding comprises adopting a multi-layer co-extrusion film blowing;
preferably, the blow molding temperature is 150-190 ℃.
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