CN104416987A - Low-thickness polyethylene heat shrinkable film - Google Patents

Low-thickness polyethylene heat shrinkable film Download PDF

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Publication number
CN104416987A
CN104416987A CN201310385913.5A CN201310385913A CN104416987A CN 104416987 A CN104416987 A CN 104416987A CN 201310385913 A CN201310385913 A CN 201310385913A CN 104416987 A CN104416987 A CN 104416987A
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density polyethylene
polyethylene
low
metallocene
ldpe
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CN104416987B (en
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黄镇荣
黄卫东
罗振华
林城
全明德
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DONGGUAN CITY ZHENGXIN PACKING PRODUCTS Co Ltd
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DONGGUAN CITY ZHENGXIN PACKING 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
    • B32B27/06—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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • 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
    • B32B2307/552—Fatigue 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • 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
    • B32B2439/00—Containers; Receptacles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention belongs to the technical field of heat shrinkable films, and in particular relates to a low-thickness polyethylene heat shrinkable film. The thickness of the polyethylene heat shrinkable film is 45-50 mu m; the polyethylene heat shrinkable film comprises three layers of co-extrusion cohesive thin films, namely an outer layer, a middle layer and an inner layer; the outer layer comprises metallocene polyethylene, low-density polyethylene and high-density polyethylene in a mass ratio of (3-5):(2-3):2; the middle layer comprises metallocene polyethylene, low-density polyethylene and high-density polyethylene in a mass ratio of 8:(1-2):(2-3); the inner layer comprises metallocene polyethylene, low-density polyethylene and high-density polyethylene in a mass ratio of (5-7):2:1. According to the low-thickness polyethylene heat shrinkable film, on the basis that excellent physical and mechanical properties such as heat shrinkage rate, tearing strength, breakage and tensile strength, break elongation and impact strength are kept, the 40-50% of materials are saved, and the cost is effectively reduced.

Description

A kind of polyethylene heat-shrinkage film of low thickness
Technical field
The invention belongs to heat-shrinkable film technology field, be specifically related to a kind of polyethylene heat-shrinkage film of low thickness.
Background technology
Heat shrink films is mainly used in sale and the transport of various product, and its Main Function is firmly, hides and protection product, so heat shrink films must have higher paracentesis resistance, and good shrinkage and shrinkage stress.Initial heat shrink films is based on PVC, and along with improving constantly heat shrink films performance requirement, PVC heat shrink films reduces gradually, and the development of various polythene PE multilayer coextruding pyrocondensation film rapidly.Polyethylene heat-shrinkage film is the good material of a kind of toughness, be widely used in the one integral piece assembly package of the products such as drinks, pop can class, mineral water class, various beverage class, cloth, this product pliability is good, and impact resistance, tear resistance are strong, not cracky, be not afraid of tide, shrinkage factor is large.
Along with the development of technology, each enterprise makes every effort on the basis meeting the good physics of heat shrink films, mechanical performance, reduces thickness and the cost of heat shrink films further.
Therefore, a kind of heat shrink films reducing thickness and production cost of proposition is needed badly.
Summary of the invention
The object of this invention is to provide thickness and cost heat shrink films that a kind of physical and mechanical properties well also can reduce heat shrink films.
The object of the present invention is achieved like this.
A polyethylene heat-shrinkage film for low thickness, the thickness of described polyethylene heat-shrinkage film is 45 μm-50 μm, and described polyethylene heat-shrinkage film comprises the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
Described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:(3-5): 1;
Described outer field raw material comprises mass ratio for (3-5): (2-3): the metallocene PE of 2, low density polyethylene (LDPE) and high density polyethylene (HDPE);
It is 8:(1-2 that the raw material in described intermediate layer comprises mass ratio): the metallocene PE of (2-3), low density polyethylene (LDPE) and high density polyethylene (HDPE);
The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is (5-7): 2:1;
Described metallocene PE comprises that melt index is 0.1-0.3g/10min, density is more than 0.940 g/cm 3pERT tubing level metallocene PE.
PERT tubing level metallocene PE comprises a kind of a kind of medium density polyethylene adopting special MOLECULE DESIGN and synthesis technique to produce, it adopts the method for ethene and octene copolymer, unique molecular structure is obtained by the quantity and distribution that control side chain, improve poly heat resistance, thus improve the poly scope of application.On average introduce 20 methyl branches in every 1000 carbon atoms in the poly molecular backbone of PERT level, or 13 ethyl branch, its performance change is how many and length is different determines by side chain.Copolymerization can make the connection chain between the little platelet of its crystal increase.Existence due to octene short-chain branch makes the large molecule of PE uncrystallizable in a flat crystal, but be applied in several crystal, define the connection between crystal, thus remain the good pliability of polyethylene, high thermal conductivity and inertia, make it resistance to pressure better simultaneously.The crystal field of force formed due to the shish-kebab of molecule rank can be overlapping, it can have the carrying out being hindered deformation by crystal interaction force when stretching, thus improve overall deflection and rigidity, foreign impacts active force is absorbed again because the amorphous fraction between shish-kebab can effectively relax, the toughness of material also can be improved, so after use PERT tubing level metallocene PE, film stretching, tear, the performance such as puncture is compared with other polyethylene film, improve a lot, its environmental stress resistance, ageing-resistantly also to increase.
Wherein, described metallocene PE also comprises melt index is 0.3-0.5g/10min, 0.920-0.940g/ cm 3geomembrane rank metallocene PE or melt index be 0.3-0.8g/10min, density is 0.910-0.940 g/ cm 3one or both of blown film rank metallocene PE.
Geomembrane rank metallocene PE has following characteristics: the chemical solutions such as anti-aging, uvioresistant, fabulous tear-proof, puncture resistant ability, coefficient of friction is large, fragility is low, thermal deformation is little, have good chemical stability, the temperature range that conforms is large, high-low temperature resistant, resistance to pitch, oil and tar, acid and alkali resistance, salt, splendid anti-seepage effect, short construction period, low, nontoxic, the anti-root system of plant of cost, resist chemical performance, impermeable effective.
Blown film rank metallocene PE has following characteristics: (1) molecular separating force is large, thus has high tensile, tearing toughness, impact strength; (2) heat sealability is good, and heat seal strength is high; (3) high containing harmful transparent composition, transparency, good in optical property; (4) not containing low-molecular-weight, low crystallised component, therefore resistance to alkane extraction; (5) low smelling property, wholesomeness are excellent; Stress crack resistant; Film resistance to blocking is good; Resistance to boiling, resistance to acupuncture.
On the basis of PERT tubing level metallocene PE, increase geomembrane rank metallocene PE and blown film rank metallocene PE, improve the processing characteristics of PERT tubing level metallocene PE, improve the toughness of film further.
Wherein, described low density polyethylene (LDPE) is melt index is 0.2-0.5g/10min, and density is 0.918-0.925g/cm 3low density polyethylene (LDPE); Described high density polyethylene (HDPE) is melt index is 0.7 below g/10 min, density is 0.95-0.97g/ cm 3high density polyethylene (HDPE).
Wherein, the thickness of described polyethylene heat-shrinkage film is 46 μm-48 μm.
Wherein, the thickness of described polyethylene heat-shrinkage film is for being 45 μm.
Wherein, described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 4:2:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:1.5:2; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 6:2:1.
Wherein, described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 3:2:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:2:2.5; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 5:2:1.
Wherein, described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 4.5:2.5:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:2:3; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 6:2:1.
Wherein, described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 5:3:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:1:3; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 5:2:1.
Wherein, its preparation method is extruded after each layer raw material mixing and stirring by three-layer co-extruded equipment; The draw ratio of the extrusion screw rod of described three-layer co-extruded equipment is 32:1 ~ 36:1, and the chilling temperature of the vane of three-layer co-extruded equipment is 18 DEG C ~ 25 DEG C, make the cooling of polyethylene heat-shrinkage film evenly.
Preferably, described skin comprises the fluorine-containing polymer processing aids accounting for outer gross weight 0.5-2.5%; Described intermediate layer comprises the fluorine-containing polymer processing aids accounting for intermediate layer gross weight 0.5-2.5%; Described internal layer comprises the fluorine-containing polymer processing aids accounting for internal layer gross weight 0.5-2.5%.
Preferably, described skin comprises the one or several arbitrarily in fire retardant, antioxidant, light stabilizer and antistatic additive; Described intermediate layer comprises the one or several arbitrarily in fire retardant, antioxidant, light stabilizer and antistatic additive; Described internal layer comprises the one or several arbitrarily in fire retardant, antioxidant, light stabilizer and antistatic additive.Described fire retardant, antioxidant, light stabilizer and antistatic additive are plastic processing usual auxiliaries, can selectively add.
Beneficial effect of the present invention is: the skin of polyethylene heat-shrinkage film of the present invention, the thickness in intermediate layer, internal layer optionally use metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) and mass ratio thereof, on the basis keeping the good physical and mechanical properties such as percent thermal shrinkage, tearing strength, fracture tensile strength, elongation at break, impact strength, thickness is reduced to 45 μm-50 μm, save material 40-50%, effectively reduce cost; The performances such as the use of PERT tubing level metallocene PE makes the stretching of heat-shrinkable film, tears, puncture are compared with other polyethylene film, improve a lot, environmental stress resistance, ageing-resistant, chucking power of the present invention is high, deflection good, puncture resistant, make packaging firmer without broken hole, is beneficial to transport and stacks.
Detailed description of the invention
Below by embodiment, the invention will be further described, but practical range of the present invention is not limited to this.
Embodiment 1.
A polyethylene heat-shrinkage film for low thickness, described polyethylene heat-shrinkage film is made up of the film of outer, intermediate layer and the three-layer co-extruded bonding of internal layer.
Described skin adopts:
1Kg melt index is 0.3g/10min, density is more than 0.940 g/cm 3pERT tubing level metallocene PE,
0.5Kg melt index is 0.3g/10min, density is 0.927 g/cm 3geomembrane rank metallocene PE,
1Kg melt index is 0.25g/10min, density is 0.923 g/cm 3low density polyethylene (LDPE),
1Kg melt index is 0.04g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE);
And the polymer processing aids that 0.04kg Tai Lema board is fluorine-containing.
Described intermediate layer adopts:
4Kg melt index 0.14g/10min, 0.943g/ cm 3pERT tubing level metallocene PE,
1.5Kg melt index is 0.3g/10min, density is 0.927g/cm 3geomembrane rank metallocene PE,
2.5Kg melt index 0.8g/10min, 0.917g/ cm 3blown film rank metallocene PE,
2Kg melt index is 0.24g/10min, density is 0.925g/cm 3low density polyethylene (LDPE),
2.5Kg melt index is 0.1g/10min, density is 0.95g/ cm 3high density polyethylene (HDPE);
And the polymer processing aids that 0.125kg Tai Lema board is fluorine-containing.
Described internal layer adopts:
5Kg melt index 0.14g/10min, 0.943g/ cm 3pERT tubing level metallocene PE,
2Kg melt index is 0.25g/10min, density is 0.923 g/cm 3low density polyethylene (LDPE),
1Kg melt index is 0.04g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE);
And the polymer processing aids that 0.04kg Tai Lema board is fluorine-containing.
Three-layer co-extruded equipment is used by above raw material to produce according to three layers of 1:4:1, the polyethylene heat-shrinkage film of obtained a kind of low thickness.The draw ratio of the extrusion screw rod of described three-layer co-extruded equipment is 32:1, and the chilling temperature of the vane of three-layer co-extruded equipment is 18 DEG C.
The thickness of the polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains be 45 μm (wherein, outer 7.5 μm, 30 μm, intermediate layer, internal layers 7.5 μm), mist degree 29%, glossiness (45 °) 40%, fall to marking impact strength 120g, Elmendorf tear strength (MD/TD) 480/1500 N/cm, fracture tensile strength (MD/TD) 47/50Mpa, elongation at break (MD/TD) 703/800%, percent thermal shrinkage (130 DEG C × 20 seconds MD/TD) 71/22%.
The polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains can be used for the bundling package of the soda of 600ml × 24 bottle (PET bottle).
Embodiment 2.
A polyethylene heat-shrinkage film for low thickness, described polyethylene heat-shrinkage film is made up of the film of outer, intermediate layer and the three-layer co-extruded bonding of internal layer.
Described skin adopts:
3Kg melt index is 0.3g/10min, density is 0.946g/cm 3pERT tubing level metallocene PE,
1Kg melt index 0.9g/10min, 0.921g/ cm 3blown film rank metallocene PE,
2Kg melt index is 0.5g/10min, density is 0.921 g/cm 3low density polyethylene (LDPE),
2Kg melt index is 0.3g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE).
Described intermediate layer adopts:
10Kg melt index is 0.2g/10min, density is 0.940g/cm 3pERT tubing level metallocene PE,
3Kg melt index is 0.3g/10min, 0.925g/ cm 3geomembrane rank metallocene PE,
3Kg melt index 0.9g/10min, 0.921g/ cm 3blown film rank metallocene PE,
3Kg melt index is 0.5g/10min, density is 0.921 g/cm 3low density polyethylene (LDPE),
4Kg melt index is 0.3g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE).
Described internal layer adopts:
6Kg melt index is 0.3g/10min, density is 0.946g/cm 3pERT tubing level metallocene PE,
2Kg melt index is 0.5g/10min, density is 0.921 g/cm 3low density polyethylene (LDPE),
1Kg melt index is 0.3g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE).
Three-layer co-extruded equipment is used by above raw material to produce according to three layers of 1:3:1 technique, the polyethylene heat-shrinkage film of obtained a kind of low thickness.The draw ratio of the extrusion screw rod of three-layer co-extruded equipment is 33:1, and the chilling temperature of the vane of three-layer co-extruded equipment is 19 DEG C.
The thickness 50 μm of the polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains (wherein, outer 10 μm, 30 μm, intermediate layer, internal layer 10 μm), mist degree 9%, glossiness (45 °) 60%, fall to marking impact strength 280g, Elmendorf tear strength (MD/TD) 455/1520 N/cm, fracture tensile strength (MD/TD) 43/47Mpa, elongation at break (MD/TD) 590/810%, percent thermal shrinkage (130 DEG C × 20 seconds MD/TD) 72/21%.
The polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains can be used for the bundling package of the soda of 2L × 8 bottle (PET bottle) or 1.25L × 12 bottle.
Embodiment 3.
A polyethylene heat-shrinkage film for low thickness, described polyethylene heat-shrinkage film is made up of the film of outer, intermediate layer and the three-layer co-extruded bonding of internal layer.
Described skin adopts:
3Kg melt index is 0.11g/10min, density is 0.944g/cm 3pERT tubing level metallocene PE,
1Kg melt index 1.0g/10min, 0.925g/ cm 3blown film rank metallocene PE,
2Kg melt index is 0.5g/10min, density is 0.922g/cm 3low density polyethylene (LDPE),
2Kg melt index is 0.7g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE);
0.05kg Magnesium Hydroxide Inorganic Flame Retardant.
Described intermediate layer adopts:
10Kg melt index is 0.1-0.3g/10min, density is more than 0.940 g/cm 3pERT tubing level metallocene PE,
5Kg melt index is 0.5g/10min, density is 0.944g/cm 3geomembrane rank metallocene PE,
5Kg melt index 1.0g/10min, 0.925g/ cm 3blown film rank metallocene PE,
5Kg melt index is 0.5g/10min, density is 0.922g/cm 3low density polyethylene (LDPE),
7. 5Kg melt index is 0.7g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE);
0.325kg Magnesium Hydroxide Inorganic Flame Retardant.
Described internal layer adopts:
3.5Kg melt index is 0.11g/10min, density is 0.944g/cm 3pERT tubing level metallocene PE,
1Kg melt index is 0.5g/10min, density is 0.922g/cm 3low density polyethylene (LDPE),
0.5Kg melt index is 0.7g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE);
0.05kg Magnesium Hydroxide Inorganic Flame Retardant.
Three-layer co-extruded equipment is used to produce according to 1:5:1 technique above raw material, the polyethylene heat-shrinkage film of obtained a kind of low thickness.The draw ratio of the extrusion screw rod of three-layer co-extruded equipment is 34:1, and the chilling temperature of the vane of three-layer co-extruded equipment is 21 DEG C.
The thickness 48 μm of the polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains (wherein, outer 6.9 μm, 34.2 μm, intermediate layer, internal layer 6.9 μm), mist degree 10%, glossiness (45 °) 119%, fall to marking impact strength 140g, Elmendorf tear strength (MD/TD) 455/1450N/cm, fracture tensile strength (MD/TD) 40/44Mpa, elongation at break (MD/TD) 600/790%, percent thermal shrinkage (130 DEG C × 20 seconds MD/TD) 72/21%.
The polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains can be used for the bundling package of the water of 600mL × 24 bottle (PET bottle).
Embodiment 4.
A polyethylene heat-shrinkage film for low thickness, described polyethylene heat-shrinkage film is made up of the film of outer, intermediate layer and the three-layer co-extruded bonding of internal layer.
Described skin adopts:
2.5Kg melt index is 0.11g/10min, density is 0.944g/cm 3pERT tubing level metallocene PE,
1.5Kg melt index is 0.3g/10min, density is 0.920 g/cm 3low density polyethylene (LDPE),
1Kg melt index is 0.7g/10min, density is 0.95g/ cm 3high density polyethylene (HDPE);
0.075Kg titanium dioxide light stabilizer.
Described intermediate layer adopts:
8Kg melt index is 0.11g/10min, density is 0.944g/cm 3pERT tubing level metallocene PE,
1Kg melt index is 0.8g/10min, density is 0.918 g/cm 3low density polyethylene (LDPE),
3Kg melt index is 0.7g/10min, density is 0.95g/ cm 3high density polyethylene (HDPE);
0.18Kg titanium dioxide light stabilizer.
Described internal layer adopts:
5.5Kg melt index is 0.11g/10min, density is 0.944g/cm 3pERT tubing level metallocene PE,
2.2Kg melt index is 0.3g/10min, density is 0.920 g/cm 3low density polyethylene (LDPE),
1.1Kg melt index is 0.7g/10min, density is 0.95g/ cm 3high density polyethylene (HDPE);
0.132Kg titanium dioxide light stabilizer.
Three-layer co-extruded equipment is used to produce according to 1:5:1 technique above raw material, the polyethylene heat-shrinkage film of obtained a kind of low thickness.The draw ratio of the extrusion screw rod of three-layer co-extruded equipment is 35:1, and the chilling temperature of the vane of three-layer co-extruded equipment is 23 DEG C.
The polyethylene heat-shrinkage film thickness 46 μm of the low thickness that the present embodiment obtains (wherein, outer 6.5 μm, 33 μm, intermediate layer, internal layer 6.5 μm), mist degree 29%, glossiness (45 °) 60%, fall to marking impact strength 150g, Elmendorf tear strength (MD/TD) 520/1580 N/cm, fracture tensile strength (MD/TD) 43/45Mpa, elongation at break (MD/TD) 550/720%, percent thermal shrinkage (130 DEG C × 20 seconds MD/TD) 72/21%.
The polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains can be used for the bundling package of 2L × 8 bottle (PET bottle).
Embodiment 5.
A polyethylene heat-shrinkage film for low thickness, described polyethylene heat-shrinkage film comprises skin, the film of intermediate layer and outer three layers of extrusion blow-molded bonding is formed;
Described skin adopts:
4.5Kg melt index is 0.2g/10min, density is 0.950 g/cm 3pERT tubing level metallocene PE,
2.5Kg melt index is 0.3g/10min, density is 0.923g/cm 3low density polyethylene (LDPE),
1.1Kg melt index is 0.5g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE);
Described intermediate layer adopts:
12Kg melt index is 0.14g/10min, density is 0.941g/cm 3pERT tubing level metallocene PE,
3Kg melt index is 0.3g/10min, density is 0.923g/cm 3low density polyethylene (LDPE)
4.5Kg melt index is 0.7g/10min, density is 0.961g/ cm 3high density polyethylene (HDPE);
Described internal layer adopts:
3Kg melt index is 0.2g/10min, density is 0.950 g/cm 3pERT tubing level metallocene PE,
1Kg melt index is 0.3g/10min, density is 0.923g/cm 3low density polyethylene (LDPE),
0.5Kg melt index is 0.5g/10min, density is 0.96g/ cm 3high density polyethylene (HDPE).
Three-layer co-extruded equipment is used to produce according to 1:3:1 technique above raw material, the polyethylene heat-shrinkage film of obtained a kind of low thickness.The draw ratio of the extrusion screw rod of three-layer co-extruded equipment is 36:1, and the chilling temperature of the vane of three-layer co-extruded equipment is 25 DEG C.
The thickness of the polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains be 50 μm (wherein, outer 10 μm, 30 μm, intermediate layer, internal layers 10 μm), mist degree 8%, glossiness (45 °) 70%, fall to marking impact strength 300g, Elmendorf tear strength (MD/TD) 455/1450 N/cm, fracture tensile strength (MD/TD) 41/46Mpa, elongation at break (MD/TD) 600/710%, percent thermal shrinkage (130 DEG C × 20 seconds MD/TD) 69/18%.
The polyethylene heat-shrinkage film of the low thickness that the present embodiment obtains can be used for the bundling package of 2.5L × 6 bottle (PET bottle).
Table 1 is the physical property contrast table of the present invention and ordinary hot shrink film.
Table 1
。
Can be found out by the contrast of table 1: the thickness of the Thickness Ratio ordinary hot shrink film of heat shrink films of the present invention greatly reduces, but percent thermal shrinkage is still suitable with ordinary hot shrink film, and tearing strength, fracture tensile strength, elongation at break, impact strength, glossiness and mist degree are obviously better than ordinary hot shrink film.
The above is only better embodiment of the present invention, therefore all equivalences done according to structure, feature and the principle described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.

Claims (10)

1. a polyethylene heat-shrinkage film for low thickness, is characterized in that: the thickness of described polyethylene heat-shrinkage film is 45 μm-50 μm, and described polyethylene heat-shrinkage film comprises the film of three-layer co-extruded bonding, i.e. skin, intermediate layer and internal layer;
Described outer field thickness: the thickness in intermediate layer: the ratio of the thickness of internal layer is 1:(3-5): 1;
Described outer field raw material comprises mass ratio for (3-5): (2-3): the metallocene PE of 2, low density polyethylene (LDPE) and high density polyethylene (HDPE);
It is 8:(1-2 that the raw material in described intermediate layer comprises mass ratio): the metallocene PE of (2-3), low density polyethylene (LDPE) and high density polyethylene (HDPE);
The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is (5-7): 2:1;
Described metallocene PE comprises that melt index is 0.1-0.3g/10min, density is more than 0.940 g/cm 3pERT tubing level metallocene PE.
2. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: it is 0.3-0.5g/10min, 0.920-0.940g/ cm that described metallocene PE also comprises melt index 3geomembrane rank metallocene PE or melt index be 0.3-0.8g/10min, density is 0.910-0.940 g/ cm 3one or both of blown film rank metallocene PE.
3. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: described low density polyethylene (LDPE) is melt index is 0.2-0.5g/10min, and density is 0.918-0.925g/cm 3low density polyethylene (LDPE); Described high density polyethylene (HDPE) is melt index is 0.7 below g/10 min, density is 0.95-0.97g/ cm 3high density polyethylene (HDPE).
4. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: the thickness of described polyethylene heat-shrinkage film is 46 μm-48 μm.
5. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: the thickness of described polyethylene heat-shrinkage film is for being 45 μm.
6. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 4:2:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:1.5:2; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 6:2:1.
7. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 3:2:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:2:2.5; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 5:2:1.
8. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 4.5:2.5:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:2:3; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 6:2:1.
9. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1, is characterized in that: described outer field raw material comprises metallocene PE, low density polyethylene (LDPE) and the high density polyethylene (HDPE) that mass ratio is 5:3:2; The raw material in described intermediate layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 8:1:3; The raw material of described internal layer comprises metallocene PE, low density polyethylene (LDPE) and high density polyethylene (HDPE) that mass ratio is 5:2:1.
10. the polyethylene heat-shrinkage film of a kind of low thickness according to claim 1 ~ 9 any one, is characterized in that: its preparation method is extruded after each layer raw material mixing and stirring by three-layer co-extruded equipment; The draw ratio of the extrusion screw rod of described three-layer co-extruded equipment is 32:1 ~ 36:1.
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CN105058938A (en) * 2015-06-05 2015-11-18 无锡市方成彩印包装有限公司 Thermal shrinkage packaging film and production method thereof
CN105459549A (en) * 2015-12-29 2016-04-06 东莞市正新包装制品有限公司 PE heat shrink film
CN105644094A (en) * 2015-12-29 2016-06-08 东莞市正新包装制品有限公司 PO (polyolefin) heat shrinkage film
CN106739359A (en) * 2016-12-29 2017-05-31 广东铭丰包装材料有限公司 A kind of non-stretched polyethylene film and preparation method thereof
CN107458059A (en) * 2016-06-03 2017-12-12 中国石油化工股份有限公司 A kind of polyethylene heat-shrinkage film
CN107759835A (en) * 2016-08-17 2018-03-06 张德发 A kind of environment-friendly type shrink film of high flexibility
CN109532177A (en) * 2018-12-28 2019-03-29 广东超维塑料薄膜有限公司 A kind of three-layer co-extruded polyethylene label film and preparation method thereof
CN109648917A (en) * 2019-01-26 2019-04-19 中侨路易塑胶制品（东莞）有限公司 More multi-direction automatic necking bags of adhesive tape and preparation method thereof
CN109733035A (en) * 2019-01-12 2019-05-10 山东中塑泰富科技有限公司 A kind of ultra-thin heavy packaging heat shrink films
CN110216904A (en) * 2019-06-11 2019-09-10 浙江优美新材料有限公司 A kind of preparation method of environment-friendly type automatic packaging film
CN110356086A (en) * 2019-08-09 2019-10-22 广东安德力新材料有限公司 Cross-linked polyolefin is heat-shrinked thick film and preparation method thereof
CN110733217A (en) * 2019-06-27 2020-01-31 常州工业职业技术学院 unidirectional stretching multilayer co-extrusion polyethylene twisted film
CN110757924A (en) * 2018-07-25 2020-02-07 中国石油化工股份有限公司 Heat shrinkable film composition
CN111469519A (en) * 2020-04-07 2020-07-31 上海冠宝塑胶有限公司 High-transmittance PE (polyethylene) heat shrinkable film and preparation process thereof
CN112895647A (en) * 2021-02-07 2021-06-04 黄山永新股份有限公司 Uniaxially stretched polyethylene resin film and preparation method thereof
CN117246018A (en) * 2023-10-25 2023-12-19 沧州市鑫峰塑料有限公司 PE heat-shrinkable film and preparation method thereof
CN117567809A (en) * 2024-01-16 2024-02-20 新疆独山子石油化工有限公司 Metallocene polyethylene heat-shrinkable film, and composition and preparation method thereof

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CN105459549A (en) * 2015-12-29 2016-04-06 东莞市正新包装制品有限公司 PE heat shrink film
CN105644094A (en) * 2015-12-29 2016-06-08 东莞市正新包装制品有限公司 PO (polyolefin) heat shrinkage film
CN107458059B (en) * 2016-06-03 2019-10-22 中国石油化工股份有限公司 A kind of polyethylene heat-shrinkage film
CN107458059A (en) * 2016-06-03 2017-12-12 中国石油化工股份有限公司 A kind of polyethylene heat-shrinkage film
CN107759835A (en) * 2016-08-17 2018-03-06 张德发 A kind of environment-friendly type shrink film of high flexibility
CN106739359A (en) * 2016-12-29 2017-05-31 广东铭丰包装材料有限公司 A kind of non-stretched polyethylene film and preparation method thereof
CN106739359B (en) * 2016-12-29 2018-02-13 广东铭丰包装材料有限公司 A kind of non-stretched polyethylene film and preparation method thereof
CN110757924B (en) * 2018-07-25 2022-04-08 中国石油化工股份有限公司 Heat shrinkable film
CN110757924A (en) * 2018-07-25 2020-02-07 中国石油化工股份有限公司 Heat shrinkable film composition
CN109532177A (en) * 2018-12-28 2019-03-29 广东超维塑料薄膜有限公司 A kind of three-layer co-extruded polyethylene label film and preparation method thereof
CN109733035A (en) * 2019-01-12 2019-05-10 山东中塑泰富科技有限公司 A kind of ultra-thin heavy packaging heat shrink films
CN109648917A (en) * 2019-01-26 2019-04-19 中侨路易塑胶制品（东莞）有限公司 More multi-direction automatic necking bags of adhesive tape and preparation method thereof
CN110216904A (en) * 2019-06-11 2019-09-10 浙江优美新材料有限公司 A kind of preparation method of environment-friendly type automatic packaging film
CN110733217A (en) * 2019-06-27 2020-01-31 常州工业职业技术学院 unidirectional stretching multilayer co-extrusion polyethylene twisted film
CN110356086A (en) * 2019-08-09 2019-10-22 广东安德力新材料有限公司 Cross-linked polyolefin is heat-shrinked thick film and preparation method thereof
CN111469519A (en) * 2020-04-07 2020-07-31 上海冠宝塑胶有限公司 High-transmittance PE (polyethylene) heat shrinkable film and preparation process thereof
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CN112895647A (en) * 2021-02-07 2021-06-04 黄山永新股份有限公司 Uniaxially stretched polyethylene resin film and preparation method thereof
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