CN110722855A - High-tensile transparent stretch film - Google Patents
High-tensile transparent stretch film Download PDFInfo
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- CN110722855A CN110722855A CN201910921833.4A CN201910921833A CN110722855A CN 110722855 A CN110722855 A CN 110722855A CN 201910921833 A CN201910921833 A CN 201910921833A CN 110722855 A CN110722855 A CN 110722855A
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- film
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- inner layer
- density polyethylene
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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
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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
- 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
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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
- 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
-
- 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
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- 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
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- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-tensile-strength transparent stretch film, which comprises an inner layer and an outer layer, wherein the weight of the inner layer accounts for 20-30% of the total weight of the film, the weight of the outer layer accounts for 70-80% of the total weight of the film, the thickness of the inner layer accounts for 20-30% of the total thickness of the film, the thickness of the outer layer accounts for 70-80% of the total thickness of the film, and preparation raw materials of the inner layer comprise linear low-density polyethylene accounting for more than 99% of the weight ratio and an additive accounting for less than 1% of the weight ratio; the preparation raw materials of the outer layer comprise 10-30% of low density polyethylene, 70-90% of linear low density polyethylene and less than 1% of additive. The transparency of the stretched film is improved under the condition of ensuring high tensile strength, elongation at break, impact strength and puncture resistance.
Description
Technical Field
The invention relates to the technical field of films, in particular to a high-tensile transparent stretch film.
Background
The stretch film (also called winding film) has higher tensile strength and tearing resistance and good self-adhesion, so that the stretch film can wrap an object into a whole. Stretched films are commonly used in agriculture, such as greenhouse films, mulching films, packaging films, and the like, and conventional stretched films mainly include films made of Linear Low Density Polyethylene (LLDPE) and films made of Low Density Polyethylene (LDPE), as the LLDPE has a molecular structure containing short branched chains but not long branched chains of the LDPE molecular structure, the LLDPE has more outstanding performance than LDPE, mainly represented by that the tensile strength and the elongation at break are 40-50% higher than that of LDPE, in addition, the impact strength and the puncture strength are also superior to that of LDPE, because of the special physical and mechanical properties of LLDPE, most of the prior stretched films are made of the LLDPE instead of the LDPE, however, the haze value of the pure LLDPE processed film is high, and the high crystallinity thereof causes high surface roughness and low transparency of the film, so that the inner situation cannot be clearly seen when the film is used, and thus the prior art needs to be improved.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a high-tensile transparent stretch film.
In order to solve the technical problem, the invention is realized by the following scheme: a high tensile transparent stretch film is characterized in that: the stretched film comprises an inner layer and an outer layer, wherein the weight of the inner layer accounts for 20-30% of the total weight of the film, the weight of the outer layer accounts for 70-80% of the total weight of the film, the thickness of the inner layer accounts for 20-30% of the total thickness of the film, the thickness of the outer layer accounts for 70-80% of the total thickness of the film, and the inner layer and the outer layer are sequentially arranged in a film body,
the raw materials for preparing the inner layer comprise linear low-density polyethylene accounting for more than 99% by weight and additives accounting for less than 1% by weight; the outer layer is prepared from the raw materials of 10-30% by weight of low-density polyethylene, 70-90% by weight of linear low-density polyethylene and less than 1% by weight of additive.
Further, the preparation components of the linear low-density polyethylene comprise 90-94% of ethylene, 6-10% of alpha-olefin and less than 1% of catalyst; the preparation components of the low-density polyethylene comprise 85-90% of ethylene, 10-15% of alpha-olefin and less than 1% of catalyst.
Further, the alpha-olefin is one of octene, butene, hexene and tetramethylpentene, wherein octene and ethylene are copolymerized in a solution phase reactor, and butene, hexene and tetramethylpentene and ethylene are copolymerized in a gas phase reactor.
Further, the catalyst comprises one or more of a ziegler-natta type catalyst, a metallocene catalyst, a chromium based catalyst.
Further, the additive comprises an antioxidant accounting for 30 percent of the total weight of the additive, an ultraviolet absorbent accounting for 30 percent of the total weight of the additive and a slip agent accounting for 40 percent of the total weight of the additive.
Furthermore, the thickness of the inner layer is 0.004 mm-0.009 mm, and the thickness of the outer layer is 0.014 mm-0.024 mm.
Further, the elongation at break of the stretched film in the longitudinal direction is 441% -642%, and the elongation at break of the stretched film in the transverse direction is 512% -776%; the longitudinal tensile strength of the stretch film is 13-18.28N/25 mm, and the transverse tensile strength of the stretch film is 6.75-11N/25 mm; the dart impact strength of the stretched film is 70-80 g.
Compared with the prior art, the invention has the beneficial effects that: the stretch film is formed by co-extrusion blow molding of two layers of different raw materials, wherein the inner layer is mainly made of Linear Low Density Polyethylene (LLDPE), the outer layer is mainly made of Linear Low Density Polyethylene (LLDPE) and a small amount of Low Density Polyethylene (LDPE), the film thickness of the inner layer is about 20-30% of the total film thickness, the LLDPE of the inner layer ensures higher tensile strength, elongation at break, impact strength and puncture resistance of the film, and when a small amount of LDPE is added into the outer layer, the mechanical property of the film is not greatly reduced, but the transparency is obviously improved.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention and to clearly and unequivocally define the scope of the present invention.
Example 1
The high-tensile-strength transparent stretch film comprises an inner layer and an outer layer, wherein the weight of the inner layer accounts for 20% of the total weight of the film in the preferred embodiment of the invention, the weight of the outer layer accounts for 80% of the total weight of the film, the thickness of the inner layer accounts for 20% of the total thickness of the film, the thickness of the outer layer accounts for 80% of the total thickness of the film, the thickness of the inner layer is 0.004mmmm in the preferred embodiment of the invention, and the thickness of the outer layer is 0.016 mm;
the raw materials for preparing the inner layer comprise 99.5 percent of linear low density polyethylene and 0.5 percent of additive; the raw materials for preparing the outer layer comprise 10% of low-density polyethylene, 89.5% of linear low-density polyethylene and 0.5% of additive.
The preparation component of the linear low density polyethylene of the preferred embodiment of the present invention comprises 90.5% by weight of ethylene, 9% by weight of alpha-olefin and 0.5% by weight of catalyst; the components for preparing the low density polyethylene of the preferred embodiment of the present invention comprise 85.5% by weight of ethylene, 15% by weight of alpha-olefin and 0.5% by weight of catalyst.
The alpha-olefin can be one of octene, butene, hexene and tetramethylpentene, preferably butene, and butene and ethylene are copolymerized in a gas phase reactor by different processing technologies to obtain linear low density polyethylene and low density polyethylene respectively.
Wherein the catalyst comprises one or more of Ziegler-Natta catalyst, metallocene catalyst and chromium-based catalyst, and the preferred embodiment of the invention adopts Ziegler-Natta catalyst to catalyze polymerization.
Wherein, the additive comprises an antioxidant accounting for 30 percent of the total weight of the additive, an ultraviolet absorbent accounting for 30 percent of the total weight of the additive and a slipping agent accounting for 40 percent of the total weight of the additive; the antioxidant functions to prevent the stretched film from oxidative discoloration; the ultraviolet absorbent is used for absorbing ultraviolet rays and preventing the ultraviolet rays from penetrating through the stretched film to protect a shielding object; the function of the slip agent is to increase the fluidity of the raw material in the molten state.
Example 2
The high-tensile-strength transparent stretch film comprises an inner layer and an outer layer, wherein the weight of the inner layer accounts for 30% of the total weight of the film in the preferred embodiment of the invention, the weight of the outer layer accounts for 70% of the total weight of the film, the thickness of the inner layer accounts for 30% of the total thickness of the film, the thickness of the outer layer accounts for 70% of the total thickness of the film, the thickness of the inner layer accounts for 0.009mmmm in the preferred embodiment of the invention, and the thickness of the outer layer accounts for 0.021 mm;
the raw materials for preparing the inner layer comprise linear low-density polyethylene accounting for more than 99.5 percent by weight and additives accounting for less than 0.5 percent by weight; the raw materials for preparing the outer layer comprise 30% of low-density polyethylene, 69.5% of linear low-density polyethylene and 0.5% of additive.
The preparation component of the linear low density polyethylene of the preferred embodiment of the present invention comprises 94% by weight of ethylene, 5.5% by weight of alpha-olefin and 0.5% by weight of catalyst; the preparation component of the low-density polyethylene comprises 90% of ethylene, 9.5% of alpha-olefin and 0.5% of catalyst.
The alpha-olefin is one of octene, butene, hexene and tetramethylpentene, preferably tetramethylpentene, and the tetramethylpentene and the ethylene are respectively copolymerized in a gas-phase reactor through different processing technologies to obtain linear low-density polyethylene and low-density polyethylene.
Wherein the catalyst comprises one or more of Ziegler-Natta catalyst, metallocene catalyst and chromium-based catalyst, and the preferred embodiment of the invention adopts chromium-based catalyst to catalyze polymerization.
Wherein the additive comprises an antioxidant accounting for 30 percent of the total weight of the additive, an ultraviolet absorbent accounting for 30 percent of the total weight of the additive and a slipping agent accounting for 40 percent of the total weight of the additive; the antioxidant functions to prevent the stretched film from oxidative discoloration; the ultraviolet absorbent is used for absorbing ultraviolet rays and preventing the ultraviolet rays from penetrating through the stretched film to protect a shielding object; the function of the slip agent is to increase the fluidity of the raw material in the molten state.
The production method of the stretched film of the above two preferred embodiments is: the method comprises the following steps of,
1) mixing materials, namely uniformly mixing the preparation raw materials of the inner layer according to the formula proportion, and uniformly mixing the preparation raw materials of the outer layer according to the formula amount;
2) feeding, namely respectively adding the inner-layer mixture and the outer-layer mixture obtained in the step 1) into inner-layer and outer-layer screw barrels of a co-extrusion blow molding machine according to a formula ratio;
3) pressing, starting a co-extrusion blow molding machine, and controlling the temperature of the inner and outer layer screw cylinders to be 160-170 ℃;
4) extruding, blowing the film bubble by the raw material in a molten state through a machine head under the action of compressed air, and controlling the pressure intensity of the compressed air to be 4-5 MPa.
5) Cooling and shaping, wherein the cooling temperature is controlled to be 20-30 ℃.
6) And (5) packaging, wherein specification division is carried out according to requirements during packaging, and winding and packaging are carried out.
The surface smoothness of the stretched film has great influence on the transparency of the film, LDPE has higher transparency than LLDPE due to the flowability difference of LDPE and LLDPE, but the physical and mechanical properties of LDPE are poor, so that the tensile strength, the elongation at break, the impact strength and the puncture resistance of the film are lower; the tensile film of the invention not only ensures higher tensile strength, elongation at break, impact strength and puncture resistance, but also improves the transparency of the film.
The stretched film is formed by fusing the inner layer and the outer layer, because the contact surfaces of the inner layer and the outer layer are fused into a whole, the two sides of the surface of the stretched film can be almost regarded as the same medium (seamless fusion), the inner layer adopts Linear Low Density Polyethylene (LLDPE) as a raw material, the outer layer adopts Linear Low Density Polyethylene (LLDPE) with a small amount of Low Density Polyethylene (LDPE) as a raw material, the film thickness of the inner layer is about 20-30% of the total film thickness, the LLDPE of the inner layer ensures higher tensile strength, elongation at break, impact strength and puncture resistance of the film, and when a small amount of LDPE is added into the outer layer, the roughness of the surface of the outer layer is reduced, and the smoothness of the outer layer is improved; and the slip agent is added into the raw materials of the inner layer and the outer layer, so that the fluidity of the raw materials in a molten state is improved, the smoothness of the surface of the raw materials is further improved, and the smoother the surface of the film is, the more light rays penetrate through the film is, and the higher the transparency of the film is.
The performance tests were performed on preferred examples 1-2 and comparative example 1 (comparative example 1 is a pure LLDPE stretched film) and the test results were as follows:
from the above tables, it can be found that the tensile strength, elongation at break, and dart impact strength of the stretch film of the preferred embodiment of the present invention do not vary by more than 5% as compared with the comparative example, but the haze is reduced by 31.4% and 41.4% as compared with the comparative example, respectively, and the stretch film of the present invention improves the transparency thereof while securing high tensile strength, elongation at break, impact strength, and puncture resistance.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A high tensile transparent stretch film is characterized in that: the stretched film comprises an inner layer and an outer layer, wherein the weight of the inner layer accounts for 20-30% of the total weight of the film, the weight of the outer layer accounts for 70-80% of the total weight of the film, the thickness of the inner layer accounts for 20-30% of the total thickness of the film, the thickness of the outer layer accounts for 70-80% of the total thickness of the film, and the inner layer and the outer layer are sequentially arranged in a film body,
the raw materials for preparing the inner layer comprise linear low-density polyethylene accounting for more than 99% by weight and additives accounting for less than 1% by weight; the outer layer is prepared from the raw materials of 10-30% by weight of low-density polyethylene, 70-90% by weight of linear low-density polyethylene and less than 1% by weight of additive.
2. The high tensile transparent stretch film according to claim 1, wherein: the preparation components of the linear low-density polyethylene comprise 90-94% of ethylene, 6-10% of alpha-olefin and less than 1% of catalyst; the preparation components of the low-density polyethylene comprise 85-90% of ethylene, 10-15% of alpha-olefin and less than 1% of catalyst.
3. The high tensile transparent stretch film according to claim 2, wherein: the alpha-olefin is one of octene, butene, hexene and tetramethylpentene, wherein octene and ethylene are copolymerized in a solution phase reactor, and butene, hexene and tetramethylpentene and ethylene are copolymerized in a gas phase reactor.
4. The high tensile transparent stretch film according to claim 2, wherein: the catalyst comprises one or more of a ziegler-natta type catalyst, a metallocene catalyst, a chromium based catalyst.
5. The high tensile transparent stretch film according to claim 1, wherein: the additive comprises an antioxidant accounting for 30 percent of the total weight of the additive, an ultraviolet absorbent accounting for 30 percent of the total weight of the additive and a slip agent accounting for 40 percent of the total weight of the additive.
6. The high tensile transparent stretch film according to claim 1, wherein: the thickness of the inner layer is 0.004 mm-0.009 mm, and the thickness of the outer layer is 0.014 mm-0.024 mm.
7. The high tensile transparent stretch film according to claim 1, wherein: the elongation at break of the stretched film in the longitudinal direction is 441% -642%, and the elongation at break of the stretched film in the transverse direction is 512% -776%; the longitudinal tensile strength of the stretch film is 13-18.28N/25 mm, and the transverse tensile strength of the stretch film is 6.75-11N/25 mm; the dart impact strength of the stretched film is 70-80 g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910921833.4A CN110722855A (en) | 2019-09-26 | 2019-09-26 | High-tensile transparent stretch film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910921833.4A CN110722855A (en) | 2019-09-26 | 2019-09-26 | High-tensile transparent stretch film |
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| CN110722855A true CN110722855A (en) | 2020-01-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112406238A (en) * | 2020-12-01 | 2021-02-26 | 昆山金盟塑料薄膜有限公司 | Green environment-friendly cold-stretched film and preparation method thereof |
Citations (4)
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| CN101480861A (en) * | 2009-01-23 | 2009-07-15 | 石狮市新光塑料包装有限公司 | Novel PE film |
| WO2014102080A1 (en) * | 2012-12-27 | 2014-07-03 | Coveris Flexibles Austria Gmbh | Plastic film |
| CN105623058A (en) * | 2014-10-27 | 2016-06-01 | 中国石油化工股份有限公司 | Polyethylene thin film |
| CN107097498A (en) * | 2016-06-08 | 2017-08-29 | 长沙银腾塑印包装有限公司 | The PE films and its production method of a kind of high transparency |
-
2019
- 2019-09-26 CN CN201910921833.4A patent/CN110722855A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101480861A (en) * | 2009-01-23 | 2009-07-15 | 石狮市新光塑料包装有限公司 | Novel PE film |
| WO2014102080A1 (en) * | 2012-12-27 | 2014-07-03 | Coveris Flexibles Austria Gmbh | Plastic film |
| CN105623058A (en) * | 2014-10-27 | 2016-06-01 | 中国石油化工股份有限公司 | Polyethylene thin film |
| CN107097498A (en) * | 2016-06-08 | 2017-08-29 | 长沙银腾塑印包装有限公司 | The PE films and its production method of a kind of high transparency |
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| 赵增辉等: "LDPE共混改性mLLDPE产品性能研究", 《化学与黏合》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112406238A (en) * | 2020-12-01 | 2021-02-26 | 昆山金盟塑料薄膜有限公司 | Green environment-friendly cold-stretched film and preparation method thereof |
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