CN112389056A - Degradable barrier composite film for packaging - Google Patents

Degradable barrier composite film for packaging Download PDF

Info

Publication number
CN112389056A
CN112389056A CN201910759041.1A CN201910759041A CN112389056A CN 112389056 A CN112389056 A CN 112389056A CN 201910759041 A CN201910759041 A CN 201910759041A CN 112389056 A CN112389056 A CN 112389056A
Authority
CN
China
Prior art keywords
degradable
layer
barrier
packaging
composite film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201910759041.1A
Other languages
Chinese (zh)
Inventor
戴建民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Chuangyi Electromechanical Technology Co ltd
Original Assignee
Hangzhou Chuangyi Electromechanical Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Chuangyi Electromechanical Technology Co ltd filed Critical Hangzhou Chuangyi Electromechanical Technology Co ltd
Priority to CN201910759041.1A priority Critical patent/CN112389056A/en
Publication of CN112389056A publication Critical patent/CN112389056A/en
Withdrawn legal-status Critical Current

Links

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
    • B32B27/06—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
    • B32B27/10—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 paper or cardboard
    • 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
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/46—Applications of disintegrable, dissolvable or edible materials
    • 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
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • 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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention relates to the field of packaging materials, and discloses a degradable barrier composite film for packaging, which comprises a degradable layer and a barrier layer which are closely attached. According to the invention, on one hand, the thicknesses of the degradable layer and the barrier layer are strictly controlled, and the closely combined barrier film is fragmented by virtue of the volume change and the internal stress of the degradable layer in the degradation process, so that the degradation of the barrier film is realized. On the other hand, the auxiliary agent capable of obviously improving the melt flowability is added into the degradable material, or the molecular structure design is carried out on the degradable polymer to improve the melt flowability, so that the difficulty of preparing the composite film by a stretching process is greatly reduced after the melt flowability of the degradable material and the melt flowability of the barrier material are close.

Description

Degradable barrier composite film for packaging
Technical Field
The invention relates to the field of packaging materials, in particular to a degradable barrier composite film for packaging.
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, and 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. 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, in order to ensure the barrier effect, the thickness of the barrier layer is currently thick. And while the degradable material layer is capable of degrading, the thicker barrier layer is still not degradable. On the other hand, the flowability of the degradable material is greatly different from that of the traditional high-barrier film material (for example, the flowability of the degradable polylactic acid material is 0.8g/10min under the conditions of 190 ℃ of temperature and 2.16 kg of load according to GB/T3682-2000 standard, the melt flowability of the ethylene-vinyl alcohol copolymer (EVOH) material is 3.2g/10min under the same conditions, the melt flowability of the polyvinylidene chloride (PVDC) material is 1.9g/10min under the same conditions), the difference of the flowability of the two layers of materials causes that the two materials are difficult to be simultaneously stretched and compounded during production, the extrusion of different material layers is not uniform, and the distribution of each layer of the finally obtained product is not uniform, therefore, the barrier property and the mechanical property of the product can not meet the relevant requirements of the barrier film, and therefore, the composite film product cannot be produced by adopting a stretching process.
In order to solve the technical problem that the two materials cannot be produced by adopting a stretching process, some attempts have been made to spray a high-barrier material on the surface of a degradable film, but because the spraying process is much less dense than the stretching process, the finally formed film layer cannot meet the requirement of a high-barrier film in practical application.
Disclosure of Invention
In order to solve the technical problems, the invention provides a degradable barrier composite film for packaging, the degradable barrier composite film can realize full degradation, and a degradable layer and a barrier layer can be compounded through a stretching process.
The specific technical scheme of the invention is as follows: a degradable barrier composite film for packaging comprises a degradable layer and a barrier layer which are closely attached.
Preferably, the degradable layer and the barrier layer are compounded into a whole through a coextrusion stretching process.
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 1-20 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 3-10 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. However, the team of the present invention discovered that, if the thickness of the barrier layer is thin enough and the barrier layer can be closely attached to the degradable layer, the degradation of the barrier layer can be promoted under the driving of the volume change in the degradation process of the degradable 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 material of the degradable layer comprises one or more of polylactic acid, modified polylactic acid, polybutylene succinate and modified polybutylene succinate; the material of the barrier layer comprises one or more of polyvinylidene chloride and ethylene/vinyl alcohol copolymer.
Preferably, the modified polylactic acid is a degradable polymer obtained by copolymerizing lactic acid and a monomer which can be copolymerized with lactic acid; the melt fluidity of the modified polylactic acid is larger than that of the common polylactic acid; the modified polybutylene succinate is a degradable polymer obtained by copolymerizing succinic acid, butanediol and a monomer capable of performing copolymerization reaction with succinic acid or butanediol; the melt fluidity of the modified poly (butylene succinate) is greater than that of the common poly (butylene succinate).
More preferably, the modified polylactic acid is a polylactic acid-glycolic acid copolymer.
Preferably, the material of the degradable layer contains an auxiliary agent for increasing the melt flowability of the material of the degradable layer.
Preferably, the auxiliary agent comprises one or more of dibutyl diglycol adipate, n-tributyl acetyl citrate, isosorbide stearate and dibutyl sebacate.
Compared with the prior art, the invention has the beneficial effects that:
on the one hand, the thickness of the degradable layer and the barrier layer is strictly controlled, the thickness of the barrier layer is thinner compared with the common barrier film, although the thickness range is determined by the team of the invention after tests, and the barrier property can still be ensured at the thickness. The team of the invention finds that after the thickness of the barrier layer is reduced, the problem that the original barrier layer is difficult to degrade can be solved, and the reason is as follows: in experiments, the inventor finds that if the barrier layer is thin enough and can be tightly attached to the degradable layer, the thicker degradable layer can expand and hydrolyze with water in the natural environment, and the crosslinking degree of the polymer is reduced due to the breakage of chemical bonds in the hydrolysis process, so that the polymer which is free from the crosslinking constraint of the chemical bonds can further absorb water and expand, the degradable layer generates internal stress in the expansion process, and the barrier film tightly combined with the degradable layer is torn by the expanded degradable layer to be fragmented, and the degradable barrier film is known to have higher degradability, so that the barrier film is degradable, environment harmlessness is achieved, and the existing environmental protection pressure is greatly reduced.
On the other hand, as described in the background art, the flowability of the degradable material is greatly different from that of the traditional high-barrier film material, so that the two materials are difficult to stretch and compound simultaneously during production, the extrusion of different material layers is not uniform, and the distribution of each film of the finally obtained product is not uniform, so that the barrier property and the mechanical property of the product can not meet the related requirements of the barrier film, and therefore, the composite film product cannot be produced by adopting a stretching process so far. To this end, the present invention seeks to solve this problem by improving the melt flow of the degradable material. Firstly, the solution can be solved by adding an auxiliary agent capable of obviously improving the melt fluidity into the degradable material; secondly, the melt fluidity of the degradable polymer can be improved by molecular structure design of the degradable polymer, and particularly, the monomer capable of improving the melt fluidity is copolymerized with the degradable polymer monomer. When the melt flowability of the degradable material and the melt flowability of the barrier material are close, the difficulty of preparing the composite film by a stretching process is greatly reduced.
Detailed Description
The present invention will be further described with reference to the following examples.
General examples
A degradable barrier composite film for packaging 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 material of the degradable layer comprises one or more of polylactic acid, modified polylactic acid, polybutylene succinate and modified polybutylene succinate; the material of the barrier layer comprises one or more of polyvinylidene chloride and ethylene/vinyl alcohol copolymer.
Optionally, the modified polylactic acid is a degradable polymer obtained by copolymerizing lactic acid and a monomer which can be copolymerized with lactic acid; the melt fluidity of the modified polylactic acid is larger than that of the common polylactic acid; the modified polybutylene succinate is a degradable polymer obtained by copolymerizing succinic acid, butanediol and a monomer capable of performing copolymerization reaction with succinic acid or butanediol; the melt fluidity of the modified poly (butylene succinate) is greater than that of the common poly (butylene succinate).
The modified polylactic acid is polylactic acid-glycolic acid copolymer.
Optionally, the material of the degradable layer contains an auxiliary agent for increasing the melt flowability of the material of the degradable layer. The auxiliary agent comprises one or more of dibutyl diglycol adipate, n-tributyl acetyl citrate, isosorbide stearate and dibutyl sebacate.
Example 1
A degradable barrier composite film for packaging 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 0.1mm, and the thickness of the barrier layer is 5 μm.
The material of the degradable layer comprises modified polylactic acid; the material of the barrier layer comprises polyvinylidene chloride. The modified polylactic acid is a degradable polymer obtained by copolymerizing lactic acid and a monomer capable of copolymerizing with the lactic acid; the melt fluidity of the modified polylactic acid is larger than that of the common polylactic acid.
Example 2
A degradable barrier composite film for packaging 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 0.3mm, and the thickness of the barrier layer is 10 μm.
The material of the degradable layer comprises modified poly butylene succinate; the material of the barrier layer comprises ethylene/vinyl alcohol copolymer. The modified polybutylene succinate is a degradable polymer obtained by copolymerizing succinic acid, butanediol and a monomer capable of performing copolymerization reaction with succinic acid or butanediol; the melt fluidity of the modified poly (butylene succinate) is greater than that of the common poly (butylene succinate).
Example 3
A degradable barrier composite film for packaging 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 1mm, and the thickness of the barrier layer is 20 μm.
The material of the degradable layer comprises poly butylene succinate and acetyl tributyl citrate; the material of the barrier layer is ethylene/vinyl alcohol copolymer.
Example 4
A degradable barrier composite film for packaging 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 1mm, and the thickness of the barrier layer is 20 μm.
The material of the degradable layer comprises poly butylene succinate and acetyl tributyl citrate; the material of the barrier layer is ethylene/vinyl alcohol copolymer.
Example 5
A degradable barrier composite film for packaging comprises a paper layer, a degradable layer and a barrier layer which are closely attached in sequence. The degradable layer and the barrier layer are compounded into a whole through a coextrusion stretching process.
The thickness of the degradable layer is 0.2mm, and the thickness of the barrier layer is 5 microns.
The material of the degradable layer comprises polylactic acid-glycolic acid copolymer and isosorbide stearate; the material of the barrier layer comprises polyvinylidene chloride.
Optionally, the material of the degradable layer contains an auxiliary agent for increasing the melt flowability of the material of the degradable layer. The auxiliary agent comprises one or more of dibutyl diglycol adipate, n-tributyl acetyl citrate, isosorbide stearate and dibutyl sebacate.
Example 6
A degradable barrier composite film for packaging comprises a paper layer, a degradable layer and a barrier layer which are closely attached in sequence. The degradable layer and the barrier layer are compounded into a whole through a coextrusion stretching process.
The thickness of the degradable layer is 0.3mm, and the thickness of the barrier layer is 7 microns.
The material of the degradable layer comprises polylactic acid-glycolic acid copolymer and dibutyl sebacate; the material of the barrier layer comprises polyvinylidene chloride.
Example 7
A degradable barrier composite film for packaging 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 0.1mm, and the thickness of the barrier layer is 1 μm.
The material of the degradable layer comprises polylactic acid and dibutyl diglycol adipate; the material of the barrier layer comprises polyvinylidene chloride.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.

Claims (10)

1. A degradable barrier composite film for packaging is characterized in that: comprises a degradable layer and a barrier layer which are closely attached.
2. The degradable barrier composite film for packaging of claim 1 wherein the degradable layer and the barrier layer are compounded into one piece by a co-extrusion and stretching process.
3. The degradable barrier composite film for packaging of claim 1 wherein the thickness of the degradable layer is 5 to 100 times the thickness of the barrier layer.
4. The degradable barrier composite film for packaging of claim 3 wherein the thickness of the degradable layer is 0.1-1mm and the thickness of the barrier layer is 1-50 μm.
5. The degradable barrier composite film for packaging of claim 4, wherein the thickness of the degradable layer is 0.1-0.3mm and the thickness of the barrier layer is 5-20 μm.
6. The degradable barrier composite film for packaging of claim 1 wherein the other side surface of the degradable layer is provided with a paper layer.
7. The degradable barrier composite film for packaging of claim 1, wherein the material of the degradable layer comprises one or more of polylactic acid, modified polylactic acid, polybutylene succinate and modified polybutylene succinate; the material of the barrier layer comprises one or more of polyvinylidene chloride and ethylene/vinyl alcohol copolymer.
8. The method for preparing the degradable barrier composite film for packaging according to claim 7, wherein the modified polylactic acid is a degradable polymer obtained by copolymerizing lactic acid and a monomer which can be copolymerized with lactic acid; the melt fluidity of the modified polylactic acid is larger than that of the common polylactic acid; the modified polybutylene succinate is a degradable polymer obtained by copolymerizing succinic acid, butanediol and a monomer capable of performing copolymerization reaction with succinic acid or butanediol; the melt fluidity of the modified poly (butylene succinate) is greater than that of the common poly (butylene succinate).
9. The degradable barrier composite film for packaging of claim 1 wherein the material of the degradable layer comprises an aid for increasing the melt flowability of the material of the degradable layer.
10. The method for preparing the degradable barrier composite film for packaging according to claim 8, wherein the auxiliary agent comprises one or more of dibutyl diglycol adipate, n-tributyl acetyl citrate, isosorbide stearate and dibutyl sebacate.
CN201910759041.1A 2019-08-16 2019-08-16 Degradable barrier composite film for packaging Withdrawn CN112389056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910759041.1A CN112389056A (en) 2019-08-16 2019-08-16 Degradable barrier composite film for packaging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910759041.1A CN112389056A (en) 2019-08-16 2019-08-16 Degradable barrier composite film for packaging

Publications (1)

Publication Number Publication Date
CN112389056A true CN112389056A (en) 2021-02-23

Family

ID=74601943

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910759041.1A Withdrawn CN112389056A (en) 2019-08-16 2019-08-16 Degradable barrier composite film for packaging

Country Status (1)

Country Link
CN (1) CN112389056A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102501529A (en) * 2011-11-18 2012-06-20 佛山佛塑料科技集团股份有限公司 Biaxial drawing polylactic acid compound film with barrier property and preparation method thereof
CN206264528U (en) * 2016-12-09 2017-06-20 深圳八六三计划材料表面技术研发中心 A kind of PLA environmental protection composite membrane
CN110437482A (en) * 2019-07-11 2019-11-12 中山大学 Five layer high-barrier degradable package materials of one kind and preparation method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102501529A (en) * 2011-11-18 2012-06-20 佛山佛塑料科技集团股份有限公司 Biaxial drawing polylactic acid compound film with barrier property and preparation method thereof
CN206264528U (en) * 2016-12-09 2017-06-20 深圳八六三计划材料表面技术研发中心 A kind of PLA environmental protection composite membrane
CN110437482A (en) * 2019-07-11 2019-11-12 中山大学 Five layer high-barrier degradable package materials of one kind and preparation method

Similar Documents

Publication Publication Date Title
US4880592A (en) Manufacture of polymeric products
EP1296829B1 (en) High moisture barrier films
CN103640290B (en) Completely biodegradable composite membrane with high barrier property
JPH08323946A (en) Multi-layer biodegradable plastic film
CN101735538A (en) High barrier material with shape memory function and preparation method thereof
CN110370767A (en) Three layers of high water resistant degradable package material of one kind and preparation method
CN101016099A (en) High obstructing degradable medical multilayer composite packing film and manufacture method thereof
CN112677598A (en) Composite film, preparation method thereof and plastic film product
CN111703166A (en) High-barrier fully biodegradable BOPLA film and preparation method thereof
CN110437482A (en) Five layer high-barrier degradable package materials of one kind and preparation method
WO2004069535A1 (en) Polylactic acid multi-layer film and process for formation thereof
CN105128477A (en) Low-temperature-resistant and high-toughness unplasticized polyvinyl chloride (UPVC) composite material
JPS614752A (en) Gas-barrier molding material having excellent stretchability
CN112389056A (en) Degradable barrier composite film for packaging
CN211710240U (en) Degradable barrier multilayer composite film structure
CN113211920A (en) Multilayer co-extrusion full-degradable high-barrier packaging film and preparation method thereof
KR102042515B1 (en) Heterostructure film having improved a gas-proof property and manufacturing method the same
CN113524831B (en) Polylactic acid-based environment-friendly agricultural mulching film and preparation method thereof
CN100484757C (en) High isolation and high contraction film using polyvinyl alcohol as intermediate layer and preparation method thereof
KR102180461B1 (en) Multi-layer film comprising polyolefin carbonate-based adhesive member for packaging material and preparation method thereof
JP6947052B2 (en) Polyester multilayer film
CN104292716B (en) Plasticising toughened polyethylene composition and preparation method thereof
CN219095889U (en) High-strength three-layer co-extrusion blown film
CN111002669B (en) High-barrier high-temperature-resistant sterilization cooking film and preparation method thereof
KR102670616B1 (en) Multilayer barrier film and packing material comprising the same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20210223