CN211710240U - Degradable barrier multilayer composite film structure - Google Patents
Degradable barrier multilayer composite film structure Download PDFInfo
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- CN211710240U CN211710240U CN201921337658.6U CN201921337658U CN211710240U CN 211710240 U CN211710240 U CN 211710240U CN 201921337658 U CN201921337658 U CN 201921337658U CN 211710240 U CN211710240 U CN 211710240U
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Abstract
The utility model relates to the field of packaging materials, and discloses a degradable barrier multilayer composite membrane structure, which comprises a degradable layer and a barrier layer which are closely attached; the thickness of the degradable layer is 5-100 times of that of the barrier layer; the thickness of the degradable layer is 0.1-1mm, and the thickness of the barrier layer is 1-50 μm. The utility model discloses strictly controlled the thickness of degradable layer and barrier layer, with the help of the size change that degradable layer takes place in the degradation process and the barrier film fragmentation that the internal stress will combine closely to the degradable of barrier film has been realized.
Description
Technical Field
The utility model relates to a packaging material field especially relates to a degradable separation multilayer composite film structure.
Background
The high-barrier film material has excellent barrier property to gas, oil, moisture and the like and good mechanical property, is widely applied to the fields of product packaging of food, medicine, chemicals and the like, electronic device packaging and the like, and particularly can remarkably prolong the shelf life of the food, the medicine and the like or the storage life of the chemicals and the like in the packaging of the food, the medicine and the chemicals. At present, people in society have increasingly increased awareness of environmental protection, and people in many fields adopt degradable materials to replace traditional non-degradable or non-degradable materials.
In the high barrier film material, the most used raw materials are polyvinylidene chloride, ethylene/vinyl alcohol copolymer and the like. It is known that the above materials are difficult to degrade and have a long degradation period. Heretofore, attempts have been made to use degradable materials instead of polyvinylidene chloride, ethylene/vinyl alcohol copolymer, etc., and for example, polylactic acid (PLA), polybutylene succinate (PBS), etc. are the most commonly used degradable materials. However, the above-mentioned degradable materials cannot be used for the production of a high barrier film in general because of their disadvantages such as high brittleness, poor barrier properties, and low crystallization rate. The existing high barrier film is prepared by a film stretching process, if the material is high in brittleness and low in crystallization rate, the film is difficult to stretch to a very thin thickness during stretching, for example, the thickness of the existing commonly used high barrier film material is generally on the micrometer level, and polylactic acid can only be stretched to a level of about 0.3-1mm at most. Therefore, no mature product with degradable high-barrier film exists in the market so far, the non-degradable material is still generally adopted, and the pressure of environmental protection is continuously increased by the large-scale use of the product.
In recent years, the preparation of high barrier films in the form of composite films, i.e. in the form of a degradable material layer + a conventional barrier layer, has also been studied. However, the barrier layer is thick in order to ensure the barrier effect. And while the degradable material layer is capable of degrading, the barrier layer is not.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a degradable separation multilayer composite membrane structure, the utility model discloses a degradable separation complex film can realize full degradation.
The utility model discloses a concrete technical scheme does: a degradable barrier multilayer composite film structure comprises a degradable layer and a barrier layer which are closely attached.
Preferably, the thickness of the degradable layer is 5 to 100 times the thickness of the barrier layer.
Preferably, the thickness of the degradable layer is 10 to 50 times the thickness of the barrier layer.
Preferably, the thickness of the degradable layer is 20 to 30 times the thickness of the barrier layer.
Preferably, the thickness of the degradable layer is 0.1-1mm and the thickness of the barrier layer is 1-50 μm on the basis of the multiple relation.
Preferably, on the basis of meeting the multiple relation, the thickness of the degradable layer is 0.1-0.3mm, and the thickness of the barrier layer is 5-20 μm.
In the prior art, although there is a product in which a barrier layer and a degradable layer are compounded to form a composite barrier film, it is generally considered that although the degradable layer can be degraded, the barrier layer is still not degradable because the barrier layer is a non-degradable material. But the utility model discloses the team discovers at the research in-process by accident, if the thickness of barrier layer is enough thin to it can realize closely laminating with the degradable layer, so under the drive of volume change in the degradable layer degradation process, can promote the degradation of barrier layer. The principle of analysis is as follows: in natural environment, thick degradable layer can take place to expand and take place to hydrolyze after meeting water simultaneously, the in-process of hydrolysising is owing to the fracture of chemical bond, cause the polymer crosslinked degree to reduce, therefore, the polymer that has got rid of the chemical bond crosslinked constraint can further absorb water inflation, degradable layer produces the internal stress in the inflation process, the barrier film that closely combines with degradable layer is "torn" by expanded degradable layer, become the fragmentation, it is well known, the degradability of fragmentation and thinner barrier film is higher, thereby the degradation of barrier film has been realized, reach the environmental protection harmlessness, alleviate the environmental protection pressure that exists at present greatly. It is obvious that the above findings are not anticipated by the person skilled in the art.
Preferably, the other side surface of the degradable layer is provided with a paper layer.
Preferably, the degradable layer is made of polylactic acid, modified polylactic acid, polybutylene succinate or modified polybutylene succinate; the barrier layer is made of polyvinylidene chloride or ethylene/vinyl alcohol copolymer.
More preferably, the modified polylactic acid is a polylactic acid-glycolic acid copolymer.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses strictly controlled the thickness of degradable layer and barrier layer, for ordinary barrier film, the utility model discloses a barrier layer thickness is thinner, though the barrier film is thinner, but this thickness scope is the utility model discloses the team is confirmed after experimental, still can ensure the separation nature under this thickness. The utility model discloses the team discovery, after reducing the thickness of barrier layer, can solve the difficult problem that original barrier layer is difficult to degrade, its reason is: the utility model discloses the team discovers in the experiment, if the thickness of barrier layer is enough thin, and it can realize closely laminating with the degradable layer, so in natural environment, thick degradable layer can take place the inflation after meeting water and take place simultaneously and hydrolyze, the in-process of hydrolyzing is because the fracture of chemical bond, cause the polymer crosslinked degree to reduce, therefore, the polymer that has broken away from the crosslinked constraint of chemical bond can further absorb water the inflation, degradable layer produces the internal stress in the inflation process, the barrier film that closely combines with the degradable layer is by the expanded degradable layer "tear up", become the fragmentation, it is well known, the degradability of fragmentation and thinner barrier film is higher, thereby the degradable of barrier film has been realized, reach the environmental protection harmlessness, alleviate the environmental protection pressure that exists at present greatly.
Drawings
FIG. 1 is a schematic structural view of a degradable barrier multilayer composite film structure of example 1;
figure 2 is a schematic structural view of the degradable barrier multilayer composite film structure of example 5.
The reference signs are: degradable layer 1, barrier layer 2, paper layer 3.
Detailed Description
The present invention will be further described with reference to the following examples.
General examples
A degradable barrier multilayer composite film structure comprises a degradable layer and a barrier layer which are closely attached. The degradable layer and the barrier layer are compounded into a whole through a coextrusion stretching process.
Wherein the thickness of the degradable layer is 5 to 100 times (preferably 10 to 50 times, and more preferably 20 to 30 times) the thickness of the barrier layer. Preferably, the thickness of the degradable layer is 0.1-1mm, and the thickness of the barrier layer is 1-50 μm. Further preferably, the thickness of the degradable layer is 0.1-0.3mm, and the thickness of the barrier layer is 5-20 μm.
Optionally, the other side surface of the degradable layer is provided with a paper layer.
The degradable layer is made of polylactic acid, modified polylactic acid, polybutylene succinate or modified polybutylene succinate; the barrier layer is made of polyvinylidene chloride or ethylene/vinyl alcohol copolymer.
Example 1
As shown in fig. 1, a degradable barrier multilayer composite film structure comprises a degradable layer 1 and a barrier layer 2 which are closely attached.
Wherein the thickness of the degradable layer is 0.1mm, and the thickness of the barrier layer is 5 μm.
The degradable layer is made of modified polylactic acid; the material of the barrier layer is polyvinylidene chloride.
Example 2
A degradable barrier multilayer composite film structure comprises a degradable layer and a barrier layer which are closely attached.
Wherein the thickness of the degradable layer is 0.3mm, and the thickness of the barrier layer is 10 μm.
The degradable layer is made of modified poly butylene succinate; the material of the barrier layer is ethylene/vinyl alcohol copolymer.
Example 3
A degradable barrier multilayer composite film structure comprises a degradable layer and a barrier layer which are closely attached.
Wherein the thickness of the degradable layer is 1mm, and the thickness of the barrier layer is 20 μm.
The degradable layer is made of polybutylene succinate; the material of the barrier layer is ethylene/vinyl alcohol copolymer.
Example 4
A degradable barrier multilayer composite film structure comprises a degradable layer and a barrier layer which are closely attached.
Wherein the thickness of the degradable layer is 1mm, and the thickness of the barrier layer is 20 μm.
The degradable layer is made of polybutylene succinate; the material of the barrier layer is ethylene/vinyl alcohol copolymer.
Example 5
As shown in fig. 2, a degradable barrier multilayer composite film structure comprises a paper layer 3, a degradable layer 1 and a barrier layer 2 which are closely attached in sequence.
The thickness of the degradable layer is 0.2mm, and the thickness of the barrier layer is 5 microns.
The degradable layer is made of polylactic acid-glycolic acid copolymer; the material of the barrier layer is polyvinylidene chloride.
Example 6
A degradable barrier multilayer composite film structure comprises a paper layer, a degradable layer and a barrier layer which are sequentially and closely attached.
The thickness of the degradable layer is 0.3mm, and the thickness of the barrier layer is 7 microns.
The degradable layer is made of polylactic acid-glycolic acid copolymer; the material of the barrier layer is polyvinylidene chloride.
Example 7
A degradable barrier multilayer composite film structure comprises a degradable layer and a barrier layer which are closely attached.
Wherein the thickness of the degradable layer is 0.1mm, and the thickness of the barrier layer is 1 μm.
The degradable layer is made of polylactic acid; the material of the barrier layer is polyvinylidene chloride.
The raw materials and the equipment used in the utility model are common raw materials and equipment in the field if no special description is provided; the methods used in the present invention are conventional methods in the art unless otherwise specified.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent transformation of doing above embodiment the utility model discloses technical scheme's protection scope.
Claims (6)
1. A degradable barrier multilayer composite film structure is characterized in that: comprises a degradable layer and a barrier layer which are closely attached; the thickness of the degradable layer is 5-100 times of that of the barrier layer; the thickness of the degradable layer is 0.1-1mm, and the thickness of the barrier layer is 1-50 μm.
2. The degradable barrier multilayer composite film structure of claim 1, wherein the thickness of the degradable layer is 10 to 50 times the thickness of the barrier layer.
3. The degradable barrier multilayer composite film structure of claim 2, wherein the thickness of the degradable layer is 20 to 30 times the thickness of the barrier layer.
4. The degradable barrier multilayer composite film structure of claim 1, wherein said degradable layer has a thickness of 0.1-0.3mm and said barrier layer has a thickness of 5-20 μm.
5. The degradable barrier multilayer composite film structure of claim 1, wherein the degradable layer is provided with a paper layer on the other side surface.
6. The degradable barrier multilayer composite film structure of claim 1, wherein the material of the degradable layer is polylactic acid, modified polylactic acid, polybutylene succinate or modified polybutylene succinate; the barrier layer is made of polyvinylidene chloride or ethylene/vinyl alcohol copolymer.
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| CN201921337658.6U CN211710240U (en) | 2019-08-16 | 2019-08-16 | Degradable barrier multilayer composite film structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134790A1 (en) * | 2020-12-24 | 2022-06-30 | 广州亚俊氏真空科技股份有限公司 | Plastic film, plastic bag and preparation method therefor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022134790A1 (en) * | 2020-12-24 | 2022-06-30 | 广州亚俊氏真空科技股份有限公司 | Plastic film, plastic bag and preparation method therefor |
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