CN112937035A - Formula and processing technology of film with high stiffness and good heat sealing performance - Google Patents

Formula and processing technology of film with high stiffness and good heat sealing performance Download PDF

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Publication number
CN112937035A
CN112937035A CN201911170939.1A CN201911170939A CN112937035A CN 112937035 A CN112937035 A CN 112937035A CN 201911170939 A CN201911170939 A CN 201911170939A CN 112937035 A CN112937035 A CN 112937035A
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film
polyethylene
density polyethylene
high stiffness
good heat
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陈英杰
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Guangzhou Tongyuan Plastic Products Co ltd
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Guangzhou Tongyuan Plastic Products Co ltd
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    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • 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
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/744—Non-slip, anti-slip
    • 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
    • C08J2323/06—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
    • C08J2423/06—Polyethene

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a film formula with high stiffness and good heat sealing performance, which comprises the following components (by mass percent): 20-30% of low-density polyethylene, 30-40% of ultrahigh-density polyethylene, 78-20% of metallocene polyethylene A10, 32-15% of metallocene polyethylene B10 and 5-10% of elastomer; the invention also discloses a processing technology of the film with high stiffness and good heat sealing performance, which comprises the steps of outer layer film blowing, middle layer film blowing, inner layer film blowing, fusion of each layer and shaping and cooling; according to the invention, by changing the formula of the film, the plastic film has mild and soft feeling, good stiffness and skid-proof effect, and appearance texture, strong tensile force and toughness and strong impact resistance; the film has better hardness and stiffness, and the tensile strength of the film is stronger; the film has better tear resistance, good toughness and excellent heat seal performance; the added elastomer enables the film to have better soft and smooth feeling and high stiffness.

Description

Formula and processing technology of film with high stiffness and good heat sealing performance
Technical Field
The invention relates to the technical field of film production, in particular to a film formula with high stiffness and good heat sealing performance and a processing technology thereof.
Background
The PE film, namely the polyethylene film, is a film produced by using the PE film, and the PE film has moisture resistance and small moisture permeability; the polyethylene film (PE) can be used for manufacturing products with different properties such as low-density, medium-density and high-density polyethylene, crosslinked polyethylene and the like according to different manufacturing methods and control means; PE films are commonly used to make food packaging bags, trash bags, shopping bags, etc., but conventional PE films generally have the following disadvantages: the tensile strength is low, and the barrier property is poor; no toughness, poor bag sealing effect, unattractive printed pattern and no barrier property; therefore, a film formula with high stiffness and good heat sealing performance and a processing technology thereof are provided.
Disclosure of Invention
The invention aims to provide a film formula with high stiffness and good heat sealing performance and a processing technology thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a film formula with high stiffness and good heat sealing performance comprises the following components in percentage by mass: 20-30% of low-density polyethylene, 30-40% of ultrahigh-density polyethylene, 78-20% of metallocene polyethylene A10, 32-15% of metallocene polyethylene B10 and 5-10% of elastomer.
Preferably, the composition comprises the following components (by mass percent): 30% of low-density polyethylene, 40% of ultrahigh-density polyethylene, 10% of metallocene polyethylene A, 15% of metallocene polyethylene B and 5% of elastomer.
Preferably, the composition comprises the following components (by mass percent): 20% of low-density polyethylene, 40% of ultrahigh-density polyethylene, 20% of metallocene polyethylene A, 10% of metallocene polyethylene B and 10% of elastomer.
Preferably, the composition comprises the following components (by mass percent): 25% of low-density polyethylene, 35% of ultrahigh-density polyethylene, 20% of metallocene polyethylene A, 10% of metallocene polyethylene B and 10% of elastomer.
Preferably, the ultra-high density polyethylene has a melt index of 30 g/10 min and a density of 0.9 to 0.98 g/cm 3.
Preferably, the metallocene polyethylene A has a melt index of 13 g/10 min and a density of 0.93 g/cm 3.
Preferably, the metallocene polyethylene B has a melt index of 1 g/10 min and a density of 0.918 g/cm 3.
Preferably, the elastomer has a melt index of 14 g/10 min and a density of 0.862 to 0.9 g/cm 3.
A process for producing a film having high stiffness and good heat sealability as described above, comprising the steps of:
s1: and (3) outer layer film blowing: mixing 50% of low-density polyethylene and metallocene polyethylene A to form an outer layer, heating the outer layer to the film blowing temperature of 130-150 ℃ to melt raw materials, and extruding;
s2: film blowing of the middle layer: using ultrahigh density polyethylene as a middle layer, heating the middle layer to melt raw materials at the film blowing temperature of 175-180 ℃ and extruding;
s3: inner layer film blowing: mixing metallocene polyethylene B, elastomer and other 50% of low-density polyethylene to form an inner layer, heating the inner layer to 180-195 ℃ for film blowing, melting the raw materials, and extruding;
s4: fusing each layer: after the raw materials of each layer are melted, the extrusion proportion of the outer layer, the middle layer and the inner layer is 3:4:3, and the total fusion is carried out;
s5: shaping and cooling: extruding the total fused raw materials into a film, controlling the total extrusion speed of the film at 14-15 m/min, and shaping and cooling.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by changing the formula of the film, the plastic film has mild and soft feeling and good stiffness and skid resistance effects, the added ultra-high density polyethylene can make the film have appearance texture, and the film has strong tensile force, strong toughness and strong impact resistance; the added metallocene polyethylene A can ensure that the film has better hardness and stiffness and the tensile strength of the film is stronger; the added metallocene polyethylene B ensures that the film has better tear resistance, good toughness and excellent heat seal performance; the added elastomer enables the film to have better soft and smooth feeling and high stiffness; the processing technology of the invention is scientific and reasonable, has high efficiency and good popularization effect.
Drawings
FIG. 1 is a diagram showing the structure of the formulation of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, the present invention provides a technical solution:
example 1:
a film formula with high stiffness and good heat sealing performance comprises the following components in percentage by mass: 30% of low-density polyethylene, 40% of ultrahigh-density polyethylene, 10% of metallocene polyethylene A, 15% of metallocene polyethylene B and 5% of elastomer.
Further, the ultra-high density polyethylene has a melt index of 30 g/10 min and a density of 0.9 g/cm 3.
Further, metallocene polyethylene A had a melt index of 13 g/10 min and a density of 0.93 g/cm 3.
Further, the metallocene polyethylene B had a melt index of 1 g/10 min and a density of 0.918 g/cm 3.
Further, the elastomer had a melt index of 14 g/10 min and a density of 0.862 g/cm 3.
A processing technology of a film with high stiffness and good heat sealing performance comprises the following steps:
s1: and (3) outer layer film blowing: mixing 50% of low-density polyethylene and metallocene polyethylene A to form an outer layer, heating the outer layer to 130 ℃ by film blowing, melting raw materials, and extruding;
s2: film blowing of the middle layer: using the ultrahigh density polyethylene as a middle layer, heating the middle layer to 175 ℃ for melting raw materials by film blowing, and extruding;
s3: inner layer film blowing: mixing metallocene polyethylene B, elastomer and other 50% of low-density polyethylene to form an inner layer, heating the inner layer to 180 ℃ for melting raw materials, and extruding;
s4: fusing each layer: after the raw materials of each layer are melted, the extrusion proportion of the outer layer, the middle layer and the inner layer is 3:4:3, and the total fusion is carried out;
s5: shaping and cooling: extruding the total fused raw materials into a film, and controlling the total extrusion speed of the film at 14 m/min for shaping and cooling.
Example 2:
a film formula with high stiffness and good heat sealing performance comprises the following components in percentage by mass: 20% of low-density polyethylene, 40% of ultrahigh-density polyethylene, 20% of metallocene polyethylene A, 10% of metallocene polyethylene B and 10% of elastomer.
Further, the ultra-high density polyethylene has a melt index of 30 g/10 min and a density of 0.95 g/cm 3.
Further, metallocene polyethylene A had a melt index of 13 g/10 min and a density of 0.93 g/cm 3.
Further, the metallocene polyethylene B had a melt index of 1 g/10 min and a density of 0.918 g/cm 3.
Further, the elastomer had a melt index of 14 g/10 min and a density of 0.88 g/cm 3.
A processing technology of a film with high stiffness and good heat sealing performance comprises the following steps:
s1: and (3) outer layer film blowing: mixing 50% of low-density polyethylene and metallocene polyethylene A to form an outer layer, heating the outer layer to 140 ℃ by film blowing, melting raw materials, and extruding;
s2: film blowing of the middle layer: using ultrahigh density polyethylene as a middle layer, heating the middle layer to 178 ℃ by film blowing, melting raw materials and extruding;
s3: inner layer film blowing: mixing metallocene polyethylene B, elastomer and other 50% of low-density polyethylene to form an inner layer, heating the inner layer to 190 ℃ by film blowing, melting the raw materials, and extruding;
s4: fusing each layer: after the raw materials of each layer are melted, the extrusion proportion of the outer layer, the middle layer and the inner layer is 3:4:3, and the total fusion is carried out;
s5: shaping and cooling: extruding the total fused raw materials into a film, and controlling the total extrusion speed of the film at 14.5 m/min for shaping and cooling.
Example 3:
a film formula with high stiffness and good heat sealing performance comprises the following components in percentage by mass: 25% of low-density polyethylene, 35% of ultrahigh-density polyethylene, 20% of metallocene polyethylene A, 10% of metallocene polyethylene B and 10% of elastomer.
Further, the ultra-high density polyethylene has a melt index of 30 g/10 min and a density of 0.98 g/cm 3.
Further, metallocene polyethylene A had a melt index of 13 g/10 min and a density of 0.93 g/cm 3.
Further, the metallocene polyethylene B had a melt index of 1 g/10 min and a density of 0.918 g/cm 3.
Further, the elastomer had a melt index of 14 g/10 min and a density of 0.9 g/cm 3.
A processing technology of a film with high stiffness and good heat sealing performance comprises the following steps:
s1: and (3) outer layer film blowing: mixing 50% of low-density polyethylene and metallocene polyethylene A to form an outer layer, heating the outer layer to 150 ℃ by film blowing, melting the raw materials, and extruding;
s2: film blowing of the middle layer: taking the ultrahigh density polyethylene as a middle layer, heating the middle layer to 180 ℃ by film blowing, melting the raw materials, and extruding;
s3: inner layer film blowing: mixing metallocene polyethylene B, elastomer and other 50% of low-density polyethylene to form an inner layer, heating the inner layer to 195 ℃ for film blowing, melting the raw materials, and extruding;
s4: fusing each layer: after the raw materials of each layer are melted, the extrusion proportion of the outer layer, the middle layer and the inner layer is 3:4:3, and the total fusion is carried out;
s5: shaping and cooling: extruding the total fused raw materials into a film, and controlling the total extrusion speed of the film at 15 m/min for shaping and cooling.
The three groups of embodiments can be used as the embodiments of the invention, wherein the embodiment 2 is the most preferable, the invention changes the formula of the film, so that the plastic film has mild and soft feeling and good stiffness and skid resistance effects, the added ultra-high density polyethylene can enable the film to have appearance texture, strong tensile force and toughness and stronger impact resistance; the added metallocene polyethylene A can ensure that the film has better hardness and stiffness and the tensile strength of the film is stronger; the added metallocene polyethylene B ensures that the film has better tear resistance, good toughness and excellent heat seal performance; the added elastomer enables the film to have better soft and smooth feeling and high stiffness; the processing technology of the invention is scientific and reasonable, has high efficiency and good popularization effect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. A film formula with high stiffness and good heat sealing performance is characterized by comprising the following components in percentage by mass: 20-30% of low-density polyethylene, 30-40% of ultrahigh-density polyethylene, 78-20% of metallocene polyethylene A10, 32-15% of metallocene polyethylene B10 and 5-10% of elastomer.
2. A film formulation of high stiffness and good heat sealing properties according to claim 1, comprising the following ingredients (in mass percent): 30% of low-density polyethylene, 40% of ultrahigh-density polyethylene, 10% of metallocene polyethylene A, 15% of metallocene polyethylene B and 5% of elastomer.
3. A film formulation of high stiffness and good heat sealing properties according to claim 1, comprising the following ingredients (in mass percent): 20% of low-density polyethylene, 40% of ultrahigh-density polyethylene, 20% of metallocene polyethylene A, 10% of metallocene polyethylene B and 10% of elastomer.
4. A film formulation of high stiffness and good heat sealing properties according to claim 1, comprising the following ingredients (in mass percent): 25% of low-density polyethylene, 35% of ultrahigh-density polyethylene, 20% of metallocene polyethylene A, 10% of metallocene polyethylene B and 10% of elastomer.
5. The film formulation of any of claims 1-4 having high stiffness and good heat seal properties, wherein: the ultra-high density polyethylene has a melt index of 30 g/10 min and a density of 0.9-0.98 g/cm 3.
6. The film formulation of any of claims 1-4 having high stiffness and good heat seal properties, wherein: the metallocene polyethylene A had a melt index of 13 g/10 min and a density of 0.93 g/cm 3.
7. The film formulation of any of claims 1-4 having high stiffness and good heat seal properties, wherein: the metallocene polyethylene B had a melt index of 1 g/10 min and a density of 0.918 g/cm 3.
8. The film formulation of any of claims 1-4 having high stiffness and good heat seal properties, wherein: the elastomer has a melt index of 14 g/10 min and a density of 0.862 to 0.9 g/cm 3.
9. A process for producing a film having high stiffness and good heat-sealing properties according to any one of claims 1 to 8, comprising the steps of:
s1: and (3) outer layer film blowing: mixing 50% of low-density polyethylene and metallocene polyethylene A to form an outer layer, heating the outer layer to the film blowing temperature of 130-150 ℃ to melt raw materials, and extruding;
s2: film blowing of the middle layer: using ultrahigh density polyethylene as a middle layer, heating the middle layer to melt raw materials at the film blowing temperature of 175-180 ℃ and extruding;
s3: inner layer film blowing: mixing metallocene polyethylene B, elastomer and other 50% of low-density polyethylene to form an inner layer, heating the inner layer to 180-195 ℃ for film blowing, melting the raw materials, and extruding;
s4: fusing each layer: after the raw materials of each layer are melted, the extrusion proportion of the outer layer, the middle layer and the inner layer is 3:4:3, and the total fusion is carried out;
s5: shaping and cooling: extruding the total fused raw materials into a film, controlling the total extrusion speed of the film at 14-15 m/min, and shaping and cooling.
CN201911170939.1A 2019-11-26 2019-11-26 Formula and processing technology of film with high stiffness and good heat sealing performance Pending CN112937035A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102350843A (en) * 2011-09-13 2012-02-15 佛山新长盛塑料薄膜有限公司 Formula of standing bag laminated film with high impact resistance and high stiffness
CN108001002A (en) * 2017-11-30 2018-05-08 上海紫江彩印包装有限公司 Vacuum insulation panel Obstruct membrane polyolefin film, its preparation method, Obstruct membrane and vacuum insulation panel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102350843A (en) * 2011-09-13 2012-02-15 佛山新长盛塑料薄膜有限公司 Formula of standing bag laminated film with high impact resistance and high stiffness
CN108001002A (en) * 2017-11-30 2018-05-08 上海紫江彩印包装有限公司 Vacuum insulation panel Obstruct membrane polyolefin film, its preparation method, Obstruct membrane and vacuum insulation panel

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Application publication date: 20210611