CN111251686A - Three-layer high-temperature-resistant high-humidity precipitation-free film - Google Patents
Three-layer high-temperature-resistant high-humidity precipitation-free film Download PDFInfo
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- CN111251686A CN111251686A CN202010051494.1A CN202010051494A CN111251686A CN 111251686 A CN111251686 A CN 111251686A CN 202010051494 A CN202010051494 A CN 202010051494A CN 111251686 A CN111251686 A CN 111251686A
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- density polyethylene
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- 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
-
- 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
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a three-layer high-temperature-resistant high-humidity-resistant precipitation-free film which comprises an inner layer, a middle layer and an outer layer, wherein the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 1-4; the middle layer comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1-3: 1: 1-3; the inner layer comprises low-density polyethylene, linear low-density polyethylene, high-density polyethylene, metallocene polyethylene and medium-density polyethylene in the following proportion: 1: 1-4: 1-2: 1-3; the film is tested at high temperature of 60 ℃ and humidity of 80% for 120 hours and taken out, the testing method is ASTM F1249, and surface precipitates are not detected.
Description
Technical Field
The invention relates to the field of new materials, in particular to a three-layer high-temperature and high-humidity resistant precipitation-free film.
Background
Prior art PE, when used in composite film materials, typically consists of PA + aluminum foil + PE, with the PE contacting the product side, and prior art PE trilayer materials are typically formed by, for example, patent publication nos.: CN10140861A discloses a new PE film, wherein the middle layer is composed of polypropylene and metallocene linear low density polyethylene, the inner layer is composed of low density polyethylene, metallocene linear low density polyethylene and opening agent, the polypropylene is selected for the inner layer and the middle layer, which is easy to be separated out under high temperature and high humidity condition, even if it is matched with metallocene polyethylene, it is not easy to be separated out under ordinary environment, but white substance is separated out on the surface of the inner layer when contacting high humidity and high temperature, which can not reach the use standard. The inner layer is added with the opening agent, generally silicon dioxide or erucamide or oleamide is selected, the smoothness of PE can be improved, but the quality of master batches can be affected by the selection of the opening agent, the quality of amides is uneven, and the auxiliary agent with poor quality can cause the master batches to have large film taste and black spots on the film when the master batches are taken out of the film. These are all due to the excess of animal oil impurities. Therefore, the selection of the use should be determined according to the properties of the amide and the use condition. The selection of the silicon dioxide is more important, and the particle size, the specific surface area, the water content, the surface treatment and the like have important influences on the production of master batches and the film-forming process.
And precipitates with different degrees exist in the using process of the packaging material for continuous storage in a high-temperature high-humidity environment, so that the appearance and the functionality of a packaged product are easily influenced, and the surfaces of the corresponding packaged products are not completely prevented from precipitating after the packaging material is tested and taken out for 120 hours at the high temperature of 60 ℃ and the humidity of 80 ℃.
Disclosure of Invention
In order to solve the technical problems, the invention provides a three-layer high-temperature and high-humidity resistant precipitation-free film which comprises an inner layer, a middle layer and an outer layer, wherein the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 1-4;
the middle layer comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1-3: 1: 1-3;
the inner layer comprises low-density polyethylene, linear low-density polyethylene, high-density polyethylene, metallocene polyethylene and medium-density polyethylene in the following proportion: 1: 1-4: 1-2: 1-3;
the inner layer does not contain an opening agent.
Preferably, the inner layer comprises low density polyethylene, linear low density polyethylene, high density polyethylene, metallocene polyethylene, medium density polyethylene, in the following ratio: 1:2:2:1: 3.
preferably, the three-layer high-temperature and high-humidity resistant film without precipitation is prepared by a three-layer blowing head, and the die gap of the three-layer blowing head is 1.5-2.8 mm.
The three-layer high-temperature and high-humidity resistant precipitation-free film provided by the invention has the following beneficial effects: the film is tested at high temperature of 60 ℃ and humidity of 80% for 120 hours and taken out, the testing method is ASTM F1249, and surface precipitates are not detected.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
The invention provides a three-layer high-temperature-resistant high-humidity-resistant precipitation-free film which comprises an inner layer, a middle layer and an outer layer, wherein the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 1-4; the outer layer is made of no special material, is in contact with an aluminum foil layer in practical application, has low requirement on precipitation prevention, and is made of low-density polyethylene and linear low-density polyethylene to ensure certain transmittance and toughness.
The structure of the middle layer has a certain precipitation prevention rate, and the middle layer comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1-3: 1: 1-3; metallocene polyethylene is a long-chain polymer, the outside of the molecule is relatively stable, and precipitation is reduced when the metallocene polyethylene meets a high-temperature and high-humidity environment.
The most important inner layer comprises low density polyethylene, linear low density polyethylene, high density polyethylene, metallocene polyethylene and medium density polyethylene, the ratio is 1: 1-4: 1-2: 1-3, the preferred ratio is 1:2:2: 1:3, it is noted that the inner layer does not contain an opening agent, which is a material that the opening agent cannot be lacked during processing of PE, in the prior patent documents, the addition of the opening agent to increase PE molding is disclosed, in the present application, the medium density polyethylene, on one hand, due to its own properties, can increase the puncture resistance of the film, while the ratio of the medium density polyethylene to the high density polyethylene when reaching 2:3, is α -olefin copolymerization to control the density (0.926-0.940g/cm3), the crystallinity is 70-80%, the density and crystallinity are decreased when the ratio to the high density polyethylene reaches 2:3, the medium density polyethylene has a good tensile strength and tensile strength, the linear low density polyethylene, the linear low density polyethylene, the linear polyethylene, the high density, the linear polyethylene, the high-linear polyethylene, the high-linear polyethylene, the high-density, the high-linear polyethylene, the high-density, the linear polyethylene, the high.
The preparation and performance of the low density polyethylene, linear low density polyethylene and metallocene polyethylene in the materials are disclosed in the patent publication numbers: the very low density polyethylene blend disclosed in CN1535296A, published by exxonmobil chemical patent company, is not described in detail herein.
The test results of the examples are shown below and are measured by the test specification ASTM F1249:
example 1
Mixing three kinds of master batches, wherein the master batch on the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 1;
the middle-layer master batch comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1:1: 2;
the master batch of the inner layer comprises low-density polyethylene, linear low-density polyethylene, high-density polyethylene, metallocene polyethylene and medium-density polyethylene in the following proportion: 1:2:1:1: 3;
melt-processed by a blow molding machine and blow-molded by a three-layer blow head, each having a die gap of 1.5mm, to produce the final three-layer PE by the blow head.
Example 2
Mixing three kinds of master batches, wherein the master batch on the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 4;
the middle-layer master batch comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1:2: 2;
the master batch of the inner layer comprises low-density polyethylene, linear low-density polyethylene, high-density polyethylene, metallocene polyethylene and medium-density polyethylene in the following proportion: 1:2:2:1: 3;
and carrying out melt processing by a blow molding machine, carrying out blow molding by three-layer blow molding heads, wherein the die gap of each layer of blow molding head is 1.5, 2 and 2.8 after the inside, the middle and the outside respectively, and finally obtaining the three-layer PE by the blow molding heads.
Example 3
Mixing three kinds of master batches, wherein the master batch on the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 3;
the middle-layer master batch comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1:1: 2;
the master batch of the inner layer comprises low-density polyethylene, linear low-density polyethylene, high-density polyethylene, metallocene polyethylene and medium-density polyethylene in the following proportion: 1:2:2:1: 1;
melt-processed by a blow molding machine and blow-molded by a three-layer blow head, each having a die gap of 1.5mm, to produce the final three-layer PE by the blow head.
Comparative example
Practical three-layer pe ratio of current, it is outer: low density polyethylene, linear low density polyethylene; middle layer: polypropylene and metallocene linear low density polyethylene; inner layer linear low density polyethylene, metallocene linear low density polyethylene and opening agent.
The detection is obtained by detection of the food industry development research institute of the financial group legal people, and the detection report number is as follows: 108SA00751, it can be seen that the precipitation rate under the normal temperature state is not high under the same high humidity environment, and when high temperature or high humidity is met, the precipitation rate of the application can meet the standard value lower than 0.0005, so as to meet the product requirement.
Under the condition of not increasing the opening agent, the proportion of the high-density polyethylene and the medium-density polyethylene is adjusted, so that the opening agent has the consistent function, on one hand, the friction between materials and equipment in the processing process is reduced, the transparent brightness is improved, and in addition, the prepared film is easy to open and is not adhered.
Metallocene polyethylene on the one hand reduces the leach rate and on the other hand also increases the puncture resistance.
Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The three-layer high-temperature-resistant high-humidity-resistant no-precipitation film is characterized by comprising an inner layer, a middle layer and an outer layer, wherein the outer layer comprises low-density polyethylene and linear low-density polyethylene in a ratio of 1: 1-4;
the middle layer comprises metallocene polyethylene, low-density polyethylene and linear low-density polyethylene in a ratio of 1-3: 1: 1-3;
the inner layer comprises low-density polyethylene, linear low-density polyethylene, high-density polyethylene, metallocene polyethylene and medium-density polyethylene in the following proportion: 1: 1-4: 1-2: 1-3;
the inner layer does not contain an opening agent.
2. The three-layer high temperature and high humidity resistant no-precipitate film as claimed in claim 1, wherein the inner layer comprises low density polyethylene, linear low density polyethylene, high density polyethylene, metallocene polyethylene, medium density polyethylene in the following ratio: 1:2:2:1: 3.
3. the three-layer high temperature and high humidity resistant no-precipitation film according to claim 1, wherein the three-layer high temperature and high humidity resistant no-precipitation film is prepared by a three-layer blowing head, and the die gap of the three-layer blowing head is 1.5-2.8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010051494.1A CN111251686A (en) | 2020-01-17 | 2020-01-17 | Three-layer high-temperature-resistant high-humidity precipitation-free film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010051494.1A CN111251686A (en) | 2020-01-17 | 2020-01-17 | Three-layer high-temperature-resistant high-humidity precipitation-free film |
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| CN111251686A true CN111251686A (en) | 2020-06-09 |
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| CN202010051494.1A Pending CN111251686A (en) | 2020-01-17 | 2020-01-17 | Three-layer high-temperature-resistant high-humidity precipitation-free film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111775526A (en) * | 2020-06-19 | 2020-10-16 | 重庆嘉峰彩印有限公司 | High-temperature water-boiling PE film and preparation method and application thereof |
| CN114276598A (en) * | 2021-04-01 | 2022-04-05 | 上海海湾石化有限公司 | Thinned heavy packaging material and preparation method thereof |
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| JPS63118258A (en) * | 1986-11-07 | 1988-05-23 | Seiko Epson Corp | Ink storage container |
| CN101787155A (en) * | 2010-03-16 | 2010-07-28 | 南阳金牛彩印集团有限公司 | Preparation method of stewing film for beverage packing |
| CN104608443A (en) * | 2014-11-26 | 2015-05-13 | 界首市天鸿包装材料有限公司 | Processing technology for heat shrinkable film |
| CN109130418A (en) * | 2018-08-06 | 2019-01-04 | 厦门金德威包装有限公司 | A kind of low smell PE film formulation and preparation method thereof |
| CN110509646A (en) * | 2019-09-19 | 2019-11-29 | 四川厚诚新材料有限公司 | A kind of high anti-puncture curtain coating polyethylene film and preparation method thereof |
-
2020
- 2020-01-17 CN CN202010051494.1A patent/CN111251686A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63118258A (en) * | 1986-11-07 | 1988-05-23 | Seiko Epson Corp | Ink storage container |
| CN101787155A (en) * | 2010-03-16 | 2010-07-28 | 南阳金牛彩印集团有限公司 | Preparation method of stewing film for beverage packing |
| CN104608443A (en) * | 2014-11-26 | 2015-05-13 | 界首市天鸿包装材料有限公司 | Processing technology for heat shrinkable film |
| CN109130418A (en) * | 2018-08-06 | 2019-01-04 | 厦门金德威包装有限公司 | A kind of low smell PE film formulation and preparation method thereof |
| CN110509646A (en) * | 2019-09-19 | 2019-11-29 | 四川厚诚新材料有限公司 | A kind of high anti-puncture curtain coating polyethylene film and preparation method thereof |
Non-Patent Citations (5)
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| 李良: "《普通高等教育"十三五"规划教材 食品包装学》", 30 July 2017 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111775526A (en) * | 2020-06-19 | 2020-10-16 | 重庆嘉峰彩印有限公司 | High-temperature water-boiling PE film and preparation method and application thereof |
| CN114276598A (en) * | 2021-04-01 | 2022-04-05 | 上海海湾石化有限公司 | Thinned heavy packaging material and preparation method thereof |
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