CN114525082B - Cotton coating film and preparation method thereof - Google Patents

Cotton coating film and preparation method thereof Download PDF

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Publication number
CN114525082B
CN114525082B CN202210192076.3A CN202210192076A CN114525082B CN 114525082 B CN114525082 B CN 114525082B CN 202210192076 A CN202210192076 A CN 202210192076A CN 114525082 B CN114525082 B CN 114525082B
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polyethylene
parts
cotton
polyethylene layer
layer
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CN114525082A (en
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胡优
唐舫成
汪加胜
杨声远
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Guangzhou Lushan Advanced Materials Co ltd
Guangzhou Lushan New Materials Co Ltd
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Guangzhou Lushan Advanced Materials Co ltd
Guangzhou Lushan New Materials Co Ltd
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    • 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

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 cotton coating film of the invention comprises: a polyethylene layer and an adhesive layer attached to a 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. Through scientific proportion of the components, the components are matched in a synergistic way, so that the prepared cotton coating film has excellent stripping viscosity, lap joint viscosity, uncoiling property, low temperature resistance, toughness, stretching resistance and strength.

Description

Cotton coating film and preparation method thereof
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 packaging films for cotton harvesters is increasing. At present, a cotton packaging film is mainly formed by splicing a raw film (non-adhesive) and an adhesive film through an adhesive tape, wherein the high-performance adhesive film is a key material for determining the performance quality and the functionalization effect of the cotton packaging film. The adhesive film has the function similar to a winding film, and can utilize self-adhesive elastic stretching winding of the film itself when in use, and tightly wrap cotton by the viscoelasticity of the film surface and the stretching tension when in use, thereby achieving the purposes of protecting cotton and being convenient for transportation. The "tack" required during use of the cotton coating film is in fact both good peel adhesion and good lap adhesion. The higher the peel adhesion, the less prone to unpacking and the better the film sealability; the higher the overlap tack, the less likely the film will be longitudinally displaced, so to achieve a strong package, particularly such as cotton bales, typically weighing about 2 tons per bale and highly compressed, the balance between the peel tack and overlap tack of the cotton bale film must be achieved. In addition, the adhesive layer of the self-adhesive film protective film is in close contact with the back layer, so that a strong adhesive tension is generated, and a certain force is required to separate the adhesive layer from the back layer during use, and the separation force is called as unreeling force in the industry. The unreeling property is also an important property of the protective film, the unreeling force greatly influences the unreeling of the self-adhesive film and the splicing, and the requirement on the splicing adhesive tape is higher. In addition, cotton coating is mainly used in the concentrated cotton picking period of 9 to 11 months each year, and the temperature difference between day and night is large, so that the weather resistance, especially the low temperature resistance, of the cotton coating is also required to be certain, and the cotton is required to be packaged at the low temperature of about-15 ℃ and not to be scattered. In combination, the cotton bale is required to have good adhesion, unwinding and low temperature resistance for mechanical harvesting, packaging and transportation.
The cotton coating film related to the prior art, such as the one disclosed in the patent application with publication number CN110606276A, comprises a packaging film comprising a viscous zone and a non-viscous zone connected with the viscous zone, wherein one end of the viscous zone connected with the non-viscous zone is a folded end structure bent in a Z shape; the patent application with publication number of CN112141529A discloses a splicing method of cotton coating, which adopts a double splicing method of adhesive tape and heat seal to improve tensile strength, but the adhesive tape viscosity is reduced in a low-temperature environment, and the pure adhesive tape can cause the condition of breaking the coating.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the present invention is to provide a cotton envelope which has excellent peel adhesion, lap adhesion, unwinding property, low temperature resistance and mechanical properties.
The second aim 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 object of the present invention, the following technical solutions are specifically adopted:
the invention provides a cotton coating film, which comprises the following components: a polyethylene layer and an adhesive layer attached to a 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 and uniformly mixing the raw materials of all layers, and then blow molding.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a specific hydrogenated SBC pressure-sensitive adhesive, polyethylene with different properties, an anti-aging master batch, a color master batch and an auxiliary agent are adopted, the components are matched in a synergistic way through the scientific proportion of the components, and the thickness of a 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 has excellent mechanical properties such as toughness, stretching resistance and strength; the cotton bag is used for packing cotton, can withstand rebound force and gravity after the cotton is compressed, and does not scatter in the transportation process.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The cotton coating film and the preparation method thereof in the embodiment of the invention are specifically described below.
In some embodiments of the invention there is provided a cotton bale breaking 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, 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.
According to the cotton coating film, the specific hydrogenated SBC pressure-sensitive adhesive and polyethylene with different properties are adopted, and the components are matched in a synergistic manner through scientific proportion of the components, so that the prepared cotton coating film has excellent stripping viscosity, lap joint viscosity, uncoiling property and low temperature resistance, and has excellent mechanical properties such as toughness, stretching resistance and strength.
According to the invention, through the mixed use of Polyethylene (PE) with different properties, especially metallocene polyethylene (metallocene PE), the mechanical properties of the cotton coating film are greatly increased, and the color of the cotton coating film can be changed by matching with the use of color master batch, anti-aging agent master batch and processing aid on the basis, so that the weather resistance and the processing property are improved.
The cotton coating film of the invention belongs to self-adhesive films, which are mainly used in building materials such as stainless steel plates, plastic plates and the like, household appliances and electronics industry; the protective cover is used for protecting the vulnerable surface, and temporarily protecting the surface of the protected substrate during the production, processing, transportation and storage processes; the self-adhesive film prepared by the invention can be used for cotton packaging, so that the application range of the self-adhesive film is enlarged, and the mechanized harvesting of cotton is promoted.
In some embodiments of the invention, the parts by weight of metallocene polyethylene, typical but not limiting, may be, for example, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts or 70 parts, etc.; the parts by weight of linear low density polyethylene, 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, 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 anti-aging agent masterbatch, typically but not limited to, 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, typically but not limited to, 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 parts by weight of the auxiliary agent may be, for example, typically but not limited to, 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts or 0.3 parts, etc.
In some embodiments of the invention, the mass ratio of the adhesive layer to the 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 a first polyethylene layer, a second polyethylene layer, a third polyethylene layer, and a fourth polyethylene layer in that order in a direction away from the surface of the adhesive layer.
In some embodiments of the present invention, the first polyethylene layer comprises 45 to 70 parts by weight of metallocene polyethylene, 20 to 50 parts by weight of low-density polyethylene and 2 to 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 present invention, the second polyethylene layer comprises 50 to 80 parts by weight of metallocene polyethylene, 10 to 30 parts by weight of linear low density polyethylene, and 5 to 15 parts by weight of color masterbatch; preferably, the second polyethylene layer comprises 70 to 80 parts by weight of metallocene polyethylene, 10 to 20 parts by weight of linear low density polyethylene and 8 to 12 parts by weight of color masterbatch.
In some embodiments of the present invention, the third polyethylene layer comprises, by weight, 50 to 80 parts of metallocene polyethylene, 10 to 30 parts of linear low density polyethylene, 2 to 10 parts of anti-aging master batch, and 0.2 to 1 part 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 a low density polyethylene.
In some embodiments of the invention, the mass ratio of the first polyethylene layer, the second polyethylene layer, the third polyethylene layer, and the fourth polyethylene layer is 15 to 25: 25-45: 15-30: 10-20 parts; preferably, the mass ratio of the first polyethylene layer, the second polyethylene layer, the third polyethylene layer and the fourth polyethylene layer is 10 to 25: 28-32: 25-30: 15-20.
In a specific embodiment of the invention, the cotton bale envelope has a five-layer structure.
In some embodiments of the invention, the cotton envelope has a thickness of 60 to 90 μm; typical but non-limiting, for example, cotton envelopes have a thickness of 60 μm, 70 μm, 80 μm or 90 μm, etc.; preferably, the cotton envelope has a thickness of 70 to 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 present 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/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Preferably, the hydrogenated SBC pressure sensitive adhesive comprises PT6705 and/or PT7516B. PT6705 and PT7516B are the brands of tackifying resins commercially available from new materials, inc.
According to the invention, the prepared cotton coating film has excellent stripping viscosity, lap joint viscosity, uncoiling property and low temperature resistance by adopting hydrogenated SBC pressure-sensitive adhesive resin with specific performance or brand.
In some embodiments of the invention, the hydrogenated SBC pressure sensitive adhesive comprises PT6705 and PT7516B; preferably, the mass ratio of PT6705 to PT7516B is 1:0.1 to 0.4. The prepared cotton coating film has more excellent bonding performance, uncoiling performance, low temperature resistance and the like through the compound use of two hydrogenated SBC pressure-sensitive adhesive resins with different performances.
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.
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; series of Mitsui chemistry SP1540, SP2040 and SP 0540. 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 FB2230.
In some embodiments of the invention, the adjuvant comprises a fluoropolymer processing aid (PPA).
In some embodiments of the invention, the color concentrate is a color concentrate, which is a polymeric material mixture of particles formulated into a high concentration color from a resin and a large amount of pigment (up to 50%) or dye.
In some embodiments of the invention, ultraviolet light absorbers and/or stabilizers, antioxidants, and polyethylene are included in the anti-aging agent masterbatch. The anti-aging agent master batch is master batch taking PE as a carrier, and an antioxidant 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 to 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 ], triethylene glycol bis [ beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ], thioethylene bis [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 present invention, the ultraviolet light absorber comprises 4-methoxybenzylidene malonic acid dimethyl ester, 2- (2H-benzotriazole-2-yl) -4, 6-di (1-methyl-1-phenylethyl) phenol, 2- [4, 6-di (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol 2- (2-hydroxy-5-methyl) -benzotriazole, 2-hydroxy-4-n-octoxybenzophenone, poly [1- (2-hydroxy) -2, 6-tetramethyl-4-hydroxypiperidine succinate ], bis (2, 6-tetramethyl-4-piperidinyl) sebacate, poly- { [6- [ (1, 3, -tetramethylbutyl) -amino ] -1,3,5, -triazine-2, 4-diyl ] [ 2, 6-tetramethylpiperidinyl) -imino ] -1, 6-hexanediyl- [ (2, 6-tetramethylpiperidinyl) -imino ] };
in some embodiments of the invention, the stabilizer comprises bis (1, 2, 6-pentamethylpiperidinol) - α - (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl- α -butyl-malonate.
In some embodiments of the invention, there is also provided a method of preparing a cotton bale envelope as described above, comprising the steps of: and respectively and uniformly mixing the raw materials of all layers, and then blow molding.
In some embodiments of the invention, blow molding comprises using a multilayer co-extrusion blown film;
in some embodiments of the invention, the blow molding temperature is 150 to 190 ℃.
In some embodiments of the invention, a method for preparing a cotton bale coating comprises the steps of:
(A) Respectively and uniformly mixing the raw materials of each layer, and then respectively placing the raw materials in corresponding storage bins;
(B) The temperature of a five-layer coextrusion blowing machine is regulated, the temperature of an extrusion section of the adhesive layer is 150-170 ℃, the temperature of an extrusion section of the first polyethylene layer to the 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 cotton film by using a polyethylene punching machine, setting the dosage proportion and the total thickness of each layer by using an automatic material drawing and weighing system, and carrying out coextrusion film blowing, cooling and rolling to obtain the cotton film coating film with the width of 2.8m.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Examples 1 to 5
The cotton envelope film is provided in examples 1 to 5, and the components and the content of each component are shown in Table 1.
TABLE 1
Note that: the percentages in columns 4 to 8 of Table 1 are the percentages by mass of this component in each layer.
The brand of metallocene PE is 2018MA;
the brand of LDPE is 2420H;
the brand of the anti-aging agent master batch is EV139;
LLDPE has the brand 7042;
the processing aid is PPA processing aid.
The preparation method of the cotton coating film of the embodiment 1 to 5 comprises the following steps:
(A) After the raw materials of all layers are uniformly mixed, respectively placing the raw materials in corresponding storage bins;
(B) The temperature of the five-layer coextrusion blowing machine is regulated, the temperature of the extrusion section of the adhesive layer is 160 ℃, the temperature of the extrusion sections of the first polyethylene layer to the fourth polyethylene layer is 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 cotton film by using a polyethylene punching machine, setting the dosage proportion and the total thickness of each layer by using an automatic material drawing and weighing system, and carrying out coextrusion film blowing, cooling and rolling to obtain the cotton film coating film with the width of 2.8m.
Comparative examples 1 to 2
The present comparative examples 1 and 2 provide cotton envelopes with the components and the contents of the components shown in table 2.
TABLE 2
Note that: the percentages in columns 4 and 5 of Table 1 are the percentages of this component in each layer by mass.
The cotton envelopes of comparative examples 1 and 2 were prepared in the same manner as in examples 1 to 5.
Test examples
The cotton envelopes of examples 1 to 5 and comparative examples 1 to 2 were tested as follows, and the results are shown in Table 3.
Peel adhesion and tack-increasing test: referring to GB/T2792, peel strength of cotton envelope film and stainless steel substrate after bonding at room temperature for 20min and at room temperature for 168 hours after bonding is measured, and the tackifying property 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 of the cotton packaging film samples is stuck (lapped) on the back surface of the other cotton packaging film sample, the lapping area is 30mm multiplied by 50mm, and the lapping part is flat and has no air bubbles. Then, the lamination was performed by rolling with a 2kg standard roller at a speed of 300 mm/min. And (3) adding the two ends of the lap joint sample into the clamp holder of the electronic tension machine to stretch until the lap joint surface is broken. The lap tack is obtained by taking 5 samples and taking an average of the maximum force from the start of stretching to the point where the lap surface is broken.
Tensile strength test of protective film: referring to GB/T1040.3-2006, the tensile break strength of the cotton packaging film in the Machine Direction (MD) was measured and 5 samples were averaged.
Unreeling force test: two 25mm wide cotton envelopes (of uniform thickness) were laminated together on standard steel plates and then roll laminated with a 2kg standard roller at 300 mm/min. The upper cotton coating film is peeled off from the lower cotton coating film for a certain period, and then tested according to the 180 DEG peeling strength test method in GB/T2792, and the maximum value is recorded as the unreeling force.
Low temperature resistance test: and cutting a cotton packaging film sample with the length of 200mm and the width of 50mm along the longitudinal direction of the protective film, folding the cotton packaging film sample in half, mutually pasting the glue surfaces together, enabling the mutual pasting area to be 60mm multiplied by 50mm, and then rolling and pasting the cotton packaging film sample at the speed of 300mm/min by using 2kg standard rollers. Placing in a-15 ℃ low-temperature box for 2 hours, tearing the inter-rubberized surfaces in the-15 ℃ low-temperature box, immediately sticking each other again, and tearing to judge whether the adhesive is sticky. V denotes tackiness; x represents non-tackiness.
TABLE 3 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 combine the characteristics of excellent peel adhesion, lap adhesion, unwinding property, low temperature resistance, toughness, stretch resistance, strength and the like; as can be seen from the comparison of the example 4 and the example 5, the hydrogenated SBC pressure-sensitive adhesive with two different performances is compounded and used, which is beneficial to improving the performance of cotton coating.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (15)

1. A cotton bale coating comprising: a polyethylene layer and an adhesive layer attached to a surface of the polyethylene layer;
the adhesive layer comprises hydrogenated SBC pressure sensitive adhesive;
the polyethylene layer sequentially comprises a first polyethylene layer, a second polyethylene layer, a third polyethylene layer and a fourth polyethylene layer along the direction far away from the surface of the adhesive layer;
the first polyethylene layer comprises, by weight, 60-70 parts of metallocene polyethylene, 20-30 parts of low-density polyethylene and 4-6 parts of anti-aging master batch;
the second polyethylene layer comprises 70-80 parts of metallocene polyethylene, 10-20 parts of linear low-density polyethylene and 8-12 parts of color master batch in parts by weight;
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;
the fourth polyethylene layer comprises low-density polyethylene;
the mass ratio of the first polyethylene layer to the second polyethylene layer to the third polyethylene layer to the fourth polyethylene layer is 15-25: 28-32: 25-30: 15-20;
the hydrogenated SBC pressure sensitive adhesive comprises the following components in percentage by mass: PT6705 and PT7516B of 0.1 to 0.4;
the mass ratio of the adhesive layer to the polyethylene layer is 4-9: 91-96.
2. The cotton bale as defined in claim 1, wherein said cotton bale is 60-90 μm thick.
3. The cotton bale envelope of claim 1, in which the metallocene polyethylene has a melt flow index of 0.1 to 5g/10min at 190 ℃ under a load of 2.16 kg.
4. The cotton film coating of claim 1, wherein the metallocene polyethylene comprises one or more of 1018, 2018, 3518, 6026, SP1540, SP2040, and SP 0540.
5. The cotton bale as defined in claim 1, wherein said low density polyethylene has a melt flow index of 0.1 to 5g/10min at 190 ℃ under a load of 2.16 kg.
6. The cotton film coating of claim 1, wherein the linear low density polyethylene has a melt flow index of 0.1 to 4g/10min at 190 ℃ under a load of 2.16 kg.
7. The cotton bale-forming coating of claim 1, wherein said adjuvant comprises a fluoropolymer processing aid.
8. The cotton bale as defined in claim 1 wherein said anti-aging master batch includes uv absorbers and/or stabilizers, antioxidants and polyethylene.
9. The cotton film coating according to claim 8, wherein the mass ratio of the ultraviolet light absorber and/or stabilizer, the antioxidant and the polyethylene is 5-8: 0.5 to 2:1 to 3.
10. The cotton film coating of claim 8, wherein the antioxidant comprises one or more of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], triethylene glycol bis [ β - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ], thioethylene bis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris (2, 4-di-tert-butylphenyl) phosphite, and pentaerythritol tetrakis (3-laurylthiopropionate).
11. The cotton bale breaking film according to claim 8, characterized in that, the ultraviolet light absorber comprises 4-methoxybenzylidene malonic acid dimethyl ester, 2- (2H-benzotriazole-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-octoxybenzophenone, poly [1- (2-hydroxy) -2, 6-tetramethyl-4-hydroxypiperidine succinate ], bis (2, 6-tetramethyl-4-piperidinyl) sebacate, poly- { [6- [ (1, 3, -tetramethylbutyl) -amino ] -1,3,5, -triazin-2, 4-diyl ] [ 2, 6-tetramethylpiperidinyl) -imino ] -1, 6-hexanediyl- [ (2, 6-tetramethylpiperidinyl) -imino ] }.
12. The cotton bale as defined in claim 8, wherein said stabilizer comprises bis (1, 2, 6-pentamethylpiperidinol) - α - (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl- α -butyl-malonate.
13. A method of preparing a cotton bale breaking coating according to any of claims 1-12, characterised by the steps of: and respectively and uniformly mixing the raw materials of all layers, and then blow molding.
14. The method of making a cotton film coating of claim 13, wherein said blow molding comprises using a multilayer co-extrusion blown film.
15. The method of making a cotton bale covering as defined in claim 13, wherein said blow molding temperature is 150-190 ℃.
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