CN105644094A - PO (polyolefin) heat shrinkage film - Google Patents

PO (polyolefin) heat shrinkage film Download PDF

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Publication number
CN105644094A
CN105644094A CN201511025039.XA CN201511025039A CN105644094A CN 105644094 A CN105644094 A CN 105644094A CN 201511025039 A CN201511025039 A CN 201511025039A CN 105644094 A CN105644094 A CN 105644094A
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China
Prior art keywords
heat
density
shrinkable film
melting index
weight percent
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Application number
CN201511025039.XA
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Chinese (zh)
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CN105644094B (en
Inventor
黄镇荣
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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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Priority to CN201511025039.XA priority Critical patent/CN105644094B/en
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Classifications

    • 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
    • B32B27/32—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
    • B32B27/32—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
    • 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
    • B32B2307/558—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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The invention relates to a PO (polyolefin) heat shrinkage film. The PO heat shrinkage film comprises an upper layer, a middle layer and a lower layer which are sequentially arranged from top to bottom, wherein the middle layer is prepared from the following components in percentage by weight: 20-40% of polypropylene, 30-60% of mLLDPE (metallocene low-density polyethylene), and 20-40% of LDPE (low-density polyethylene). The PO heat shrinkage film has the advantage that under the synergistic function of polypropylene and mLLDPE, the tensile strength and toughness are further improved.

Description

A kind of PO heat-shrinkable film
Technical field
The present invention relates to a kind of heat-shrinkable film, particularly relate to a kind of PO heat-shrinkable film, belong to packaging film technical field.
Background technology
PO heat-shrinkable film is widely used in the one integral piece assembly package of the products such as drinks, pop can class, mineral water class, various beverage classes, and this product snappiness is good, and impact resistance, tear strength are strong, not cracky, be not afraid of tide, shrinking percentage big.
Used PO heat-shrinkable film has limitation in intensity and toughness, and general employing HDPE improves intensity. But the toughness that HDPE can make PO heat-shrinkable film significantly declines, after drink pack, easily break in transportation. Therefore how to improve tensile strength and the toughness of PO heat-shrinkable film, become problem demanding prompt solution.
Summary of the invention
Technical problem to be solved by this invention is to provide the excellent PO heat-shrinkable film of a kind of tensile strength height, toughness.
PO heat-shrinkable film of the present invention, comprise under the upper, middle and lower that arrange successively, described middle level comprises the component of following weight percent:
Polypropylene 20��40%
MLLDPE30��60%
LDPE20��40%.
Such as, the weight percent of polypropylene (PP) can be 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38% or 39%;
The weight percent of mLLDPE (metallocene PE) can be 31%, 32%, 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58% or 60%;
The weight percent of LDPE (Low Density Polyethylene) is 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38% or 39%.
Preferably, described middle level comprises the component of following weight percent:
Polypropylene 30%
MLLDPE50%
LDPE20%.
Preferably, described polypropylene is homo-polypropylene;
Preferably, described polyacrylic melting index MI is less than 1, and density is 0.890��0.905g/cm3;
Preferably, the melting index MI of described mLLDPE is less than 0.2, and density is 0.940g/cm3Above;
Preferably, the melting index MI of described LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3��
Preferably, described upper layer packets is containing the component of following weight percent:
LDPE15��30%
HDPE10��35%
MLLDPE40��80%.
Such as, the weight percent of LDPE (Low Density Polyethylene) can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28% or 29%;
The weight percent of HDPE (high density polyethylene(HDPE)) is 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%;
The weight percent of mLLDPE (metallocene PE) can be 41%, 42%, 45%, 48%, 50%, 53%, 55%, 57%, 60%, 62%, 65%, 66%, 70%, 72%, 75% or 78%.
Preferably, described upper layer packets is containing the component of following weight percent:
LDPE20%
HDPE20%
MLLDPE60%.
Preferably, the melting index MI of described LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3;
Preferably, the melting index MI of described HDPE is less than 0.01, and density is 0.955g/cm3Above;
Preferably, the melting index MI of described mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
Preferably, the formula of PO of the present invention heat-shrinkable film lower floor can be identical with upper strata, it is also possible to different, when both fill a prescription identical, PO heat-shrinkable film has the more excellent tensile strength of performance and toughness simultaneously.
Preferably, lower layer formula is identical with upper strata, is specially, and described lower floor comprises the component of following weight percent:
LDPE15��30%
HDPE10��35%
MLLDPE40��80%.
Such as, the weight percent of LDPE (Low Density Polyethylene) can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28% or 29%;
The weight percent of HDPE (high density polyethylene(HDPE)) is 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%;
The weight percent of mLLDPE (metallocene PE) can be 41%, 42%, 45%, 48%, 50%, 53%, 55%, 57%, 60%, 62%, 65%, 66%, 70%, 72%, 75% or 78%.
Preferably, described lower floor comprises the component of following weight percent:
LDPE20%
HDPE20%
MLLDPE60%.
Preferably, the melting index MI of described LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3;
Preferably, the melting index MI of described HDPE is less than 0.01, and density is 0.955g/cm3Above;
Preferably, the melting index MI of described mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
Preferably, the thickness on described upper strata: the thickness in middle level: the thickness=1:2��5:1 of lower floor, such as 1:2:1,1:2.2:1,1:2.5:1,1:2.8:1,1:3:1,1:3.5:1,1:3.7:1,1:4:1,1:4.2:1,1:4.5:1,1:4.8:1 or 1:5:1.
Preferably, the thickness on described upper strata: the thickness in middle level: the thickness=1:3:1 of lower floor.
Above-mentioned Thickness ratio adopts skeleton to strengthen structure, and intermediate density height, plays skeleton function, tensile strength and tensile strength are provided for PO heat-shrinkable film, interior outer density is low, plays muscle (skin) effect, for PO heat-shrinkable film provides preferably toughness, optical property and heat sealability.
Compared with prior art, it is an advantage of the current invention that: the nucleus of the PO heat-shrinkable film of the present invention is all polypropylene (especially homo-polypropylene) and metallocene PE;What it adopted with lower floor at the middle and upper levels is melting index height, and the mLLDPE that density is low mainly act as increasing tough; What middle level adopted is that melting index is low, and the mLLDPE that density is high, mainly act as enhancing. Therefore, by adopting the mLLDPE of different melting index, density, it is possible to ensure intensity and the toughness of PO heat-shrinkable film simultaneously.
In addition, by increasing polypropylene in middle level, its synergy with metallocene PE, it is possible to the tensile strength of increase PO heat-shrinkable film and toughness further, after tested, the tensile strength of the PO heat-shrinkable film of the present invention, toughness improve 50%, about 10% than the PO heat-shrinkable film of routine respectively.
In a word, polypropylene (especially homo-polypropylene) and metallocene PE significantly improve the overall performance of PO heat-shrinkable film; Compared with the PO heat-shrinkable film of routine, although its thickness reduces, but the weight of its pack content (such as beverage) is identical with the content of conventional PO heat-shrinkable film. Such as, the mean thickness of conventional PO heat-shrinkable film is 80 ��m, and it can pack the beverage of 15kg; Although PO heat-shrinkable film thickness of the present invention is only 60 ��m, but can pack the beverage of identical weight equally.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment 1PO heat-shrinkable film.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Comparative example
The PO heat-shrinkable film of the present embodiment is commercially available prod, and its specification is 560*0.08mm, props up beverage for packing 600mL*24. It improves the intensity of PO heat-shrinkable film by HDPE, it does not have add polypropylene.
The PO heat-shrinkable film of the present embodiment comprises the upper, middle and lower, the thickness on upper strata: the thickness in middle level: the thickness=1:3:1 of lower floor. The component that the upper and lower comprise is identical, and the weight percent of each component is: LDPE25%, HDPE25%, mPE50%; The weight percent of each component in middle level is: LDPE17%, HDPE33%, MPE50%.
Embodiment 1
The PO heat-shrinkable film of the present embodiment, as shown in Figure 1, comprise under the upper strata 1, middle level 2 and the lower floor 3 that arrange successively; The thickness on upper strata 1: the thickness in middle level 2: the thickness=1:2:1 of lower floor 3.
Wherein, upper strata 1 is identical with the formula of lower floor 3, all comprises the component of following weight percent:
LDPE30%
HDPE30%
MLLDPE40%.
Wherein, in the formula of upper strata 1 and lower floor 3, the melting index of LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3; The melting index of HDPE is less than 0.01, and density is 0.955g/cm3Above; The melting index of mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
Middle level 2 comprises the component of following weight percent:
Polypropylene 20%
MLLDPE60%
LDPE20%.
Wherein, in the formula in middle level 2, polypropylene is homo-polypropylene; Polyacrylic melting index is less than 1, and density is 0.890��0.905g/cm3; The melting index of mLLDPE is less than 0.2, and density is 0.940g/cm3Above; The melting index of LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3��
Embodiment 2
The PO heat-shrinkable film of the present embodiment, comprise under the upper, middle and lower that arrange successively; The thickness on upper strata: the thickness in middle level: the thickness=1:3:1 of lower floor.
Wherein, the formula of the upper and lower is identical, all comprises the component of following weight percent:
LDPE20%
HDPE20%
MLLDPE60%.
Wherein, in the formula of the upper and lower, the melting index of LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3;The melting index of HDPE is less than 0.01, and density is 0.955g/cm3Above; The melting index of mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
Middle level comprises the component of following weight percent:
Polypropylene 30%
MLLDPE50%
LDPE20%.
Wherein, in the formula in middle level, polypropylene is homo-polypropylene; Polyacrylic melting index is less than 1, and density is 0.890��0.905g/cm3; The melting index of mLLDPE is less than 0.2, and density is 0.940g/cm3Above; The melting index of LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3��
Embodiment 3
The PO heat-shrinkable film of the present embodiment, comprise under the upper, middle and lower that arrange successively; The thickness on upper strata: the thickness in middle level: the thickness=1:5:1 of lower floor.
Wherein, the formula of the upper and lower is identical, all comprises the component of following weight percent:
LDPE15%
HDPE10%
MLLDPE75%.
Wherein, in the formula of the upper and lower, the melting index of LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3; The melting index of HDPE is less than 0.01, and density is 0.955g/cm3Above; The melting index of mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
Middle level comprises the component of following weight percent:
Polypropylene 40%
MLLDPE30%
LDPE30%.
Wherein, in the formula in middle level, polypropylene is homo-polypropylene; Polyacrylic melting index is less than 1, and density is 0.890��0.905g/cm3; The melting index of mLLDPE is less than 0.2, and density is 0.940g/cm3Above; The melting index of LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3��
The PO heat-shrinkable film of comparative example, embodiment 1��3 is carried out performance test, and test result is in table 1.
The performance of PO heat-shrinkable film prepared by each embodiment of table 1.
Above content is only the better embodiment of the present invention, for the those of ordinary skill of this area, according to the thought of the present invention, all will change in specific embodiments and applications, and this description should not be construed as limitation of the present invention.

Claims (10)

1. a PO heat-shrinkable film, comprise under the upper strata (1), middle level (2) and the lower floor (3) that arrange successively, it is characterised in that, described middle level (2) comprise the component of following weight percent:
Polypropylene 20��40%
MLLDPE30��60%
LDPE20��40%.
2. PO heat-shrinkable film according to claim 1, it is characterised in that, described middle level (2) comprise the component of following weight percent:
Polypropylene 30%
MLLDPE50%
LDPE20%.
3. PO heat-shrinkable film according to claim 1 and 2, it is characterised in that: described polypropylene is homo-polypropylene;
Preferably, described polyacrylic melting index is less than 1, and density is 0.890��0.905g/cm3;
Preferably, the melting index of described mLLDPE is less than 0.2, and density is 0.940g/cm3Above;
Preferably, the melting index of described LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3��
4. PO heat-shrinkable film according to claim 1, it is characterised in that: described upper strata (1) comprises the component of following weight percent:
LDPE15��30%
HDPE10��35%
MLLDPE40��80%.
5. PO heat-shrinkable film according to claim 4, it is characterised in that, described upper strata (1) comprises the component of following weight percent:
LDPE20%
HDPE20%
MLLDPE60%.
6. PO heat-shrinkable film according to claim 4 or 5, it is characterised in that: the melting index of described LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3;
Preferably, the melting index of described HDPE is less than 0.01, and density is 0.955g/cm3Above;
Preferably, the melting index of described mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
7. PO heat-shrinkable film according to claim 1, it is characterised in that, described lower floor (3) comprises the component of following weight percent:
LDPE15��30%
HDPE10��35%
MLLDPE40��80%.
8. PO heat-shrinkable film according to claim 7, it is characterised in that, described lower floor (3) comprises the component of following weight percent:
LDPE20%
HDPE20%
MLLDPE60%.
9. PO heat-shrinkable film according to claim 7 or 8, it is characterised in that: the melting index of described LDPE is 0.2��0.3, and density is 0.920��0.923g/cm3;
Preferably, the melting index of described HDPE is less than 0.01, and density is 0.955g/cm3Above;
Preferably, the melting index of described mLLDPE is 0.5��1, and density is 0.916��0.920g/cm3��
10. PO heat-shrinkable film according to claim 1, it is characterised in that: the thickness of described upper strata (1): the thickness of middle level (2): the thickness=1:2��5:1 of lower floor (3), it is preferable to 1:3:1.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107458057A (en) * 2017-07-28 2017-12-12 四川兴达塑料有限公司 A kind of grease proofing PE preservative films
CN110641117A (en) * 2019-11-02 2020-01-03 宁波鸿雁包装材料有限公司 High-tensile composite film and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN107458057A (en) * 2017-07-28 2017-12-12 四川兴达塑料有限公司 A kind of grease proofing PE preservative films
CN110641117A (en) * 2019-11-02 2020-01-03 宁波鸿雁包装材料有限公司 High-tensile composite film and preparation method thereof

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