CN115850785A - Porous super-hydrophobic linear low-density polyethylene film for yogurt inner cover film and preparation method thereof - Google Patents
Porous super-hydrophobic linear low-density polyethylene film for yogurt inner cover film and preparation method thereof Download PDFInfo
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- CN115850785A CN115850785A CN202211736997.8A CN202211736997A CN115850785A CN 115850785 A CN115850785 A CN 115850785A CN 202211736997 A CN202211736997 A CN 202211736997A CN 115850785 A CN115850785 A CN 115850785A
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Abstract
The invention discloses a porous super-hydrophobic linear low-density polyethylene film for an inner film of a yoghourt cover and a preparation method thereof, wherein the surface of the porous super-hydrophobic linear low-density polyethylene film is of a porous structure, the contact angle between the surface of the film and water is 150-156 degrees, the rolling angle of water drops on the surface of the film is less than 10 degrees, and the adhesion rate of the film after being contacted with yoghourt is less than 0.5 percent. The preparation method comprises (1) mixing linear low density polyethylene, salt and white sugar, and granulating; (2) Extruding and rolling the linear low-density polyethylene master batch into a thick film; (3) Fixing the thick film on a longitudinal and transverse stretching frame, stretching the thick film into a thin film through a hot water pool, and cooling to obtain the product. The porous super-hydrophobic linear low-density polyethylene film has excellent super-hydrophobicity and acid-milk adhesion resistance, the preparation method does not use organic solvent, the raw materials can be used for food packaging, the preparation is simple and controllable, the cost is low, and the industrialization prospect is wide.
Description
Technical Field
The invention belongs to the technical field of polymer films, and particularly relates to a porous super-hydrophobic linear low-density polyethylene film for an inner film of a yoghourt cover and a preparation method thereof.
Background
The yoghourt is a very important food suitable for people of all ages, is usually in a thick liquid state, most of the adopted packages are paper cups or plastic cups, a yoghourt cover film is usually covered on the yoghourt cups, and the inner surface layer of the cover film is usually a linear low-density polyethylene film. When the yoghourt cover is opened, people often find that a large amount of yoghourt adheres to the surface layer of the inner membrane of the yoghourt cover membrane, the yoghourt needs to be scraped off from the surface layer of the inner membrane of the cover membrane by a spoon for eating, and the yoghourt cover membrane is difficult to scrape clean, so that interesting phenomena of 'licking the yoghourt cover membrane by a tongue' and the like are often seen in life. The problem that the yoghourt adheres to the surface of the inner film of the cover film often causes the waste of the yoghourt, so that the development of the cover film inner film capable of preventing the adhesion of the yoghourt has wide market demand.
In recent years, inspired by the leaf effect, an ultra-hydrophobic film having a contact angle with water of more than 150 ° has attracted much attention. The typical characteristics of a superhydrophobic film are: liquids or emulsions, etc. using water as a solvent or dispersant, have large contact angles on their surfaces, small contact areas, and small adhesion. If a linear low density polyethylene film with anti-adhesion property of the yoghourt can be prepared and applied to the inner film of the yoghourt cover film, the linear low density polyethylene film is certainly favored by the market and the broad consumers. However, according to the current literature reports, most methods for preparing the superhydrophobic linear low density polyethylene film either use organic solvents which are not environmentally friendly, or use raw materials which are not available for food packaging, or have complicated preparation methods and are difficult to be industrially applied, or use expensive equipment, so that there is no suitable method for applying the superhydrophobic linear low density polyethylene film to the yogurt lidding film so far.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a porous super-hydrophobic linear low-density polyethylene film which does not use organic solvent, can be used for food packaging as raw materials, is simple and controllable in preparation and low in cost and is used for an inner film of a yoghourt cover, and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover has a porous structure on the surface, the pore diameter is 10-200 nm, the contact angle between the film surface and water is 150-156 degrees, the rolling angle of water drops on the film surface is less than 10 degrees, and the adhesion rate of the porous super-hydrophobic linear low-density polyethylene film after being contacted with the yoghourt is less than 0.5 percent.
As a general technical concept, the present invention also provides a preparation method of the above porous superhydrophobic linear low density polyethylene film for an inner film of a yogurt cap, comprising the steps of:
(1) Mixing linear low density polyethylene, salt and white sugar uniformly, and then granulating to obtain linear low density polyethylene master batches; wherein the mass ratio of the linear low-density polyethylene to the salt to the white sugar is 80-90: 5-10;
(2) Extruding and rolling the linear low-density polyethylene master batch to form a linear low-density polyethylene thick film with the thickness of 0.05 mm-0.1 mm;
(3) Fixing the linear low-density polyethylene thick film on a longitudinal and transverse stretching frame, passing through a hot water tank at 90-100 ℃, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.005-0.02 mm, fully dissolving salt and white sugar by hot water, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover.
Preferably, in the step (1), the particle size of the linear low-density polyethylene master batch is 0.5-5 mm.
In the above preparation method of the porous superhydrophobic linear low density polyethylene film for the yogurt inner cover film, preferably, in the step (3), the length of the hot water pool is 5-20 m.
In the present invention, the linear low density polyethylene has a density of 0.918-0.935g/cm 3 。
Compared with the prior art, the invention has the advantages that:
1. the porous super-hydrophobic linear low-density polyethylene film for the yogurt inner cover film has excellent super-hydrophobicity and acid-milk adhesion resistance, and the adhesion rate of yogurt after contacting with the porous super-hydrophobic linear low-density polyethylene film is less than 0.5%.
2. The preparation method does not use organic solvent, the raw materials can be completely used for food packaging, the preparation process is simple and controllable, the equipment investment cost is low, and the industrial prospect is wide.
Drawings
FIG. 1 is a scanning electron microscope image of the surface of a porous superhydrophobic linear low density polyethylene film for yogurt inner cover film of example 1 of the present invention.
FIG. 2 is a surface contact angle test chart of a porous superhydrophobic linear low density polyethylene film for an inner membrane of a yogurt cap of example 1 of the present invention.
FIG. 3 is a surface contact angle test chart of a porous superhydrophobic linear low density polyethylene film for yogurt inner cover film of example 2 of the invention.
FIG. 4 is a surface contact angle test chart of a porous superhydrophobic linear low density polyethylene film for yogurt inner cover film of example 3 of the invention.
FIG. 5 is a surface contact angle test chart of a porous superhydrophobic linear low density polyethylene film for yogurt inner cover film of example 4 of the invention.
FIG. 6 is a surface contact angle test chart of a porous superhydrophobic linear low density polyethylene film for yogurt inner cover film of example 5 of the invention.
Detailed Description
The invention is further described below with reference to the drawings and the specific preferred embodiments, without thereby limiting the scope of protection of the invention. The materials and equipment used in the following examples are commercially available.
Example 1
The invention relates to a preparation method of a porous super-hydrophobic linear low-density polyethylene film for an inner film of a yoghourt cover, which comprises the following steps:
(1) Uniformly mixing linear low-density polyethylene, salt and white sugar according to the mass ratio of 80: 10, and granulating to form linear low-density polyethylene master batches, wherein the grain size of the master batches is 0.5mm;
(2) Extruding and rolling the linear low-density polyethylene master batch into a thick film with the thickness of 0.05 mm;
(3) Fixing the thick film on a longitudinal and transverse stretching frame, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.005mm under the condition of passing through a hot water pool with the length of 5 meters and the temperature of 90 ℃, fully dissolving salt and white sugar in the film by hot water in the stretching process, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover, wherein the micro-morphology is shown in figure 1, the surface is of a porous structure, and the pore diameter is 10 nm-200 nm. As shown in fig. 2, the surface of the porous superhydrophobic linear low density polyethylene film had a contact angle with water of 151 °. The rolling angle was 9 °, and the adhesion rate of the yogurt after contact with its surface was 0.48%.
Example 2
The invention discloses a preparation method of a porous super-hydrophobic linear low-density polyethylene film for an inner cover film of yogurt, which comprises the following steps:
(1) Uniformly mixing linear low-density polyethylene, salt and white sugar according to the mass ratio of 90: 5, and granulating to form linear low-density polyethylene master batches, wherein the grain size of the master batches is 5mm;
(2) Extruding and rolling the linear low-density polyethylene master batch into a thick film with the thickness of 0.1mm;
(3) Fixing the thick film on a longitudinal and transverse stretching frame, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.02mm under the condition of passing through a hot water pool with the length of 20 meters and the temperature of 100 ℃, fully dissolving salt and white sugar in the film out of the film by hot water in the stretching process, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover, wherein the pore diameter is 10-200 nm. As shown in fig. 3, the contact angle of the surface with water was 153 °. The rolling angle was 7 °, and the adhesion rate of the yogurt after contact with its surface was 0.42%.
Example 3
The invention relates to a preparation method of a porous super-hydrophobic linear low-density polyethylene film for an inner film of a yoghourt cover, which comprises the following steps:
(1) Uniformly mixing linear low-density polyethylene, salt and white sugar according to the mass ratio of 85: 5: 10, and granulating to form linear low-density polyethylene master batches, wherein the grain diameter of the master batches is 3mm;
(2) Extruding and rolling the linear low-density polyethylene master batch into a thick film with the thickness of 0.08 mm;
(3) Fixing the thick film on a longitudinal and transverse stretching frame, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.01mm under the condition of penetrating through a hot water pool with the length of 15 meters and the temperature of 95 ℃, fully dissolving salt and white sugar in the film by hot water in the stretching process, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover, wherein the pore diameter is 10 nm-200 nm. As shown in fig. 4, the contact angle of the surface with water was 155 °. The rolling angle was 5 °, and the adhesion rate of the yogurt after contact with its surface was 0.37%.
Example 4
The invention relates to a preparation method of a porous super-hydrophobic linear low-density polyethylene film for an inner film of a yoghourt cover, which comprises the following steps:
(1) Uniformly mixing linear low-density polyethylene, salt and white sugar according to the mass ratio of 85: 10: 5, and granulating to form linear low-density polyethylene master batches, wherein the grain diameter of the master batches is 2mm;
(2) Extruding and rolling the linear low-density polyethylene master batch into a thick film with the thickness of 0.07 mm;
(3) Fixing the thick film on a longitudinal and transverse stretching frame, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.008mm under the condition of penetrating through a hot water pool with the length of 10 meters and the temperature of 100 ℃, fully dissolving salt and white sugar in the film by hot water in the stretching process, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover, wherein the aperture is 10 nm-200 nm. As shown in fig. 5, the contact angle of the surface with water was 156 °. The rolling angle was 3 °, and the adhesion rate of the yogurt after contact with its surface was 0.35%.
Example 5
The invention relates to a preparation method of a porous super-hydrophobic linear low-density polyethylene film for an inner film of a yoghourt cover, which comprises the following steps:
(1) Uniformly mixing linear low-density polyethylene, salt and white sugar according to the mass ratio of 86: 8: 6, and granulating to form linear low-density polyethylene master batches, wherein the grain size of the master batches is 3mm;
(2) Extruding and rolling the linear low-density polyethylene master batch into a thick film with the thickness of 0.09 mm;
(3) Fixing the thick film on a longitudinal and transverse stretching frame, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.006mm under the condition of penetrating through a hot water pool with the length of 15 meters and the temperature of 100 ℃, fully dissolving salt and white sugar in the film by hot water in the stretching process, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover, wherein the pore diameter is 10 nm-200 nm. As shown in fig. 6, the contact angle of the surface with water was 152 °. The rolling angle was 6 °, and the adhesion rate of the yogurt after contact with its surface was 0.43%.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are within the scope of the technical scheme of the present invention.
Claims (4)
1. The porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover is characterized in that the surface of the porous super-hydrophobic linear low-density polyethylene film is of a porous structure, the pore diameter is 10-200 nm, the contact angle between the surface of the film and water is 150-156 degrees, the rolling angle of water drops on the surface of the film is less than 10 degrees, and the adhesion rate of the porous super-hydrophobic linear low-density polyethylene film after being contacted with the yoghourt is less than 0.5 percent.
2. A method for preparing a porous superhydrophobic linear low density polyethylene film for use in an inner film of a yoghurt cap according to claim 1, comprising the steps of:
(1) Uniformly mixing linear low-density polyethylene, salt and white sugar, and then granulating to obtain linear low-density polyethylene master batches; wherein the mass ratio of the linear low-density polyethylene to the salt to the white sugar is 80-90: 5-10;
(2) Extruding and rolling the linear low-density polyethylene master batch to form a linear low-density polyethylene thick film with the thickness of 0.05 mm-0.1 mm;
(3) Fixing the linear low-density polyethylene thick film on a longitudinal and transverse stretching frame, passing through a hot water tank at 90-100 ℃, stretching the thick film to a linear low-density polyethylene film with the thickness of 0.005-0.02 mm, fully dissolving salt and white sugar by hot water, and cooling to obtain the porous super-hydrophobic linear low-density polyethylene film for the inner film of the yoghourt cover.
3. The method for preparing the porous super-hydrophobic linear low-density polyethylene film for the inner membrane of the yogurt cap as claimed in claim 2, wherein in the step (1), the particle size of the linear low-density polyethylene masterbatch is 0.5mm to 5mm.
4. The method for preparing a porous superhydrophobic linear low density polyethylene film for an inner film of a yogurt cap according to claim 2 or 3, wherein in the step (3), the length of the hot water pool is 5-20 m.
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| CN202211736997.8A CN115850785A (en) | 2022-12-30 | 2022-12-30 | Porous super-hydrophobic linear low-density polyethylene film for yogurt inner cover film and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102627799A (en) * | 2012-04-25 | 2012-08-08 | 上海长歌包装材料有限公司 | Super-hydrophobicity low-density polyethylene thin film material and preparation method thereof |
| JP2013035559A (en) * | 2011-08-05 | 2013-02-21 | Showa Denko Packaging Co Ltd | Content sticking preventive lid material and method of manufacturing the same |
| CN108484967A (en) * | 2018-03-05 | 2018-09-04 | 浙江工业大学 | A kind of preparation process and application that dimethyl silicone polymer/graphene oxide is composite porous |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013035559A (en) * | 2011-08-05 | 2013-02-21 | Showa Denko Packaging Co Ltd | Content sticking preventive lid material and method of manufacturing the same |
| CN102627799A (en) * | 2012-04-25 | 2012-08-08 | 上海长歌包装材料有限公司 | Super-hydrophobicity low-density polyethylene thin film material and preparation method thereof |
| CN108484967A (en) * | 2018-03-05 | 2018-09-04 | 浙江工业大学 | A kind of preparation process and application that dimethyl silicone polymer/graphene oxide is composite porous |
Non-Patent Citations (1)
| Title |
|---|
| 郑建勇等: "CaCO_3颗粒模板法制备聚合物超亲水/超疏水表面", 高分子学报, no. 10, pages 1186 - 1192 * |
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