CN109397809A - A kind of degradable composite membrane and preparation method thereof - Google Patents
A kind of degradable composite membrane and preparation method thereof Download PDFInfo
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- CN109397809A CN109397809A CN201811266702.9A CN201811266702A CN109397809A CN 109397809 A CN109397809 A CN 109397809A CN 201811266702 A CN201811266702 A CN 201811266702A CN 109397809 A CN109397809 A CN 109397809A
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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
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Wrappers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
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- Biological Depolymerization Polymers (AREA)
Abstract
The present invention provides a kind of degradable composite membranes and preparation method thereof.The degradable composite membrane includes outer layer, middle layer, internal layer, outer layer weight accounts for the 20~40% of film gross weight, middle layer weight accounts for the 30~50% of film gross weight, interior layer weight accounts for the 20~40% of film gross weight, by weight percentage, the raw material for preparing of outer layer is made of the LLDPE LL0220AA of 10~30% LDPE 2420H and 70~90%；The raw material for preparing in middle layer is made of the LLDPE 1002BU of 10~30% LDPE 2420H, 20~40% LLDPE LL0220AA and 40~60%；The raw material for preparing of internal layer is made of the LLDPE 1002BU of 20~40% LDPE FT6236,30~40% MDPE 5401 and 30~40%.Degradable composite membrane of the invention has high tensile strength, and degradable.
Description
Technical field
The invention belongs to thin film technique field, it is related to a kind of composite membrane and preparation method thereof, more particularly to a kind of degradable
Composite membrane and preparation method thereof.
Background technique
PE stretched film (also known as winding film) tensile strength with higher, tearing toughness, and there is good tack,
Therefore object can be made to wrap up in into an entirety, prevents from being scattered when transport and collapses.The film has the excellent transparency, and package object is beautiful
It is generous, and object waterproof and dustproof, anti-tamper can be made, therefore be widely used in cargo pallet packaging, such as electronics, building materials, chemical industry, gold
The bundle of the industries such as metal products, automobile parts, wire and cable, daily necessities, food, papermaking wraps up in packaging.Most of PE add for blown film
Work film, standard low density PE (LDPE) or linear low close PE (LLDPE) are all available.HDPE film-grade is generally used for requiring superior
Draftability and fabulous barrier properties place.
With the demand that low-carbon is lived, conventional plastic is just gradually backed out the arena of history, and what is come into being is degradable modeling
Expect material.At present two kinds of degradable materials of mainstream are light degradation material and biodegradation material respectively, wherein photodegradable plastics
Technology is mature in the 1980s, and increase of production is quickly.Problem of the existing technology is: photodegradable plastics due to
Itself it is only used for that the sunshine-duration is long, the sufficient area of the quantity of illumination uses, and there should be narrow scope, be limited to farmland covering etc., separately more
On the one hand, the main component of photodegradable plastics is polyene resinoid, and degradable property falls under suspicion；For biodegradation material
Research become more important；But since the molecular weight of polyethylene is big；Hydrophobicity is strong, therefore polythene material is in nature
Biodegrade it is very slow.
It includes outer layer, middle layer, internal layer three that CN103029397A, which discloses a kind of film and its production method, the film,
Point, each section composition ratio is (weight percent): outer layer 23%, middle layer 52%, internal layer 25%, wherein outer layer is by LDPE
TN00, MDPE 1018HA, LLDPE 0209AA, LLDPE 120F composition, middle layer is by MDPE 2310, LLDPE 2230, LLDPE
0209AA, 075 masterbatch composition, internal layer is by LDPE TN00, MDPE 1018HA, MDPE 5400, MDPE 1018FA, LLDPE
0209AA, LLDPE 120F composition are prepared for that one kind is readily mass-produced, friction subsurface power is high, inner by adjusting the raw material ratio of each layer
The small film of layer frictional force, but its intensity and degradability need to be further increased.
CN105538854A discloses a kind of Biodegradable polyethylene material, including hydrophilic surface layer and at least one layer of polyethylene
Film, between the hydrophilic surface layer and polyethylene film and polyethylene film is each other with the bonding of water-soluble viscose glue；The hydrophilic table
Layer by weight include following component: 20~35 parts of polyvinyl alcohol, 3~5 parts of starch, 2~5 parts of kaolin it is low with 2426H close
10~15 parts of polyethylene, 3~5 parts of pro-oxidant of degree；The polyethylene film includes following component by weight: 7042 is linear poly-
45~60 parts of ethylene, 3~5 parts of PE slipping agent, 15~25 parts of 5301 high density polyethylene (HDPE), 3~5 parts of lignin, kaolin 5~10
Part, 5~10 parts of pro-oxidant；It is biological to enhance its that the invention can increase substantially a kind of Biodegradable polyethylene material hydrophilic
The ability of degradation, moreover it is possible to accelerate polyethylene macromolecular and split into small molecule convenient for further degradation.But the biology drop of the invention
The very slow of polythene material degradation is solved, and it is incomplete to degrade.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of degradable composite membrane and preparation method thereof,
The composite membrane has high tensile strength, and degradable.
For up to the invention purpose, the invention adopts the following technical scheme:
One of the objects of the present invention is to provide a kind of degradable composite membrane, including outer layer, middle layer, internal layer three parts, institutes
Outer layer weight accounts for film gross weight 20~40% are stated, the middle layer weight accounts for the 30~50% of film gross weight, and the interior layer weight accounts for film
The 20~40% of gross weight, wherein by weight percentage,
The outer layer prepare raw material by 10~30% LDPE 2420H and 70~90% LLDPE LL0220AA group
At；
The middle layer prepares raw material by 10~30% LDPE 2420H, 20~40% LLDPE LL0220AA and 40
~60% LLDPE 1002BU composition；
The internal layer prepare raw material by 20~40% LDPE FT6236,30~40% MDPE 5401 and 30~
40% LLDPE 1002BU composition.
It should be noted that degradable described in the present invention, refer to the degradation rate of composite membrane in half a year up to 99% or more.
In the present invention, using three layers of different material, and by adjusting every layer of ratio, make composite membrane obtained that there is height
Tensile strength, and composite membrane obtained is degradable, and the degradation rate of composite membrane is up to 99% or more in half a year；Wherein, outer layer is adopted
It is raw material with LDPE 2420H and LLDPE LL0220AA, and by adjusting the dosage of above-mentioned raw materials, improves the mechanical property of film
Can, middle layer uses LDPE 2420H, LLDPE LL0220AA and LLDPE 1002BU for raw material, and by adjusting above-mentioned raw materials
Dosage, synergistic effect make the elasticity of film, toughness enhancing, improve the tensile strength of film；Internal layer uses LDPE FT6236, MDPE
5401 and LLDPE 1002BU is raw material, improves the processing performance of film and tensile strength, makes composite membrane obtained more
It is easy degradation.
Preferably, the outer layer weight accounts for the 30% of film gross weight, and the middle layer weight accounts for the 40% of film gross weight, the internal layer
Weight accounts for the 30% of film gross weight.
By weight percentage, the LDPE 2420H and 70~90% for preparing raw material 10~30% of the outer layer
LLDPE LL0220AA composition, such as LDPE 2420H weight percent be 10%, 11%, 12%, 13%, 14%, 15%,
16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%,
The weight percent of LLDPE LL0220AA be 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%,
79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%；Preferably, percentage by weight
Than meter, the raw material for preparing of the outer layer is made of the LLDPE LL0220AA of 15~25% LDPE 2420H and 75~85%；
It is highly preferred that by weight percentage, the outer layer prepares raw material by 20% LDPE 2420H, 80% LLDPE
LL0220AA composition.
By weight percentage, the middle layer prepare raw material by 10~30% LDPE 2420H, 20~40%
The LLDPE 1002BU of LLDPE LL0220AA and 40~60% is formed, for example, the weight percent of LDPE 2420H be 10%,
11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%,
26%, 27%, 28%, 29%, the weight percent of 30%, LLDPE LL0220AA be 20%, 21%, 22%, 23%,
24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 34%, 35%, 36%, 37%, 38%, 39%, 40%,
The weight percent of LLDPE 1002BU be 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%,
50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%；Preferably, by weight percentage,
The middle layer prepares raw material by 15~25% LDPE 2420H, 25~35% LLDPE LL0220AA and 45~55%
LLDPE 1002BU composition；It is highly preferred that by weight percentage, the middle layer prepares raw material by 20% LDPE
2420H, 30% LLDPE LL0220AA and 50% LLDPE 1002BU composition.
By weight percentage, the internal layer prepare raw material by 20~40% LDPE FT6236,30~40%
The LLDPE 1002BU of MDPE 5401 and 30~40% is formed, for example, the weight percent of LDPE FT6236 is 20%, 21%,
22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 34%, 35%, 36%, 37%, 38%,
39%, the weight percent of 40%, MDPE 5401 be 30%, 31%, 34%, 35%, 36%, 37%, 38%, 39%,
The weight percent of 40%, LLDPE 1002BU are 30%, 31%, 34%, 35%, 36%, 37%, 38%, 39%, 40%；
Preferably, by weight percentage, the internal layer prepare raw material by 25~35% LDPE FT6236,35~40%
The LLDPE 1002BU of MDPE 5401 and 30~35% is formed；It is highly preferred that by weight percentage, the preparation of the internal layer
Raw material is made of the LLDPE 1002BU of 30% LDPE FT6236,38% MDPE 5401 and 32%.
The second object of the present invention is to provide a kind of preparation method of degradable composite membrane as described in the first purpose, work
Skill is simple, and the preparation method includes the following steps:
1) mixing: preparing outer layer raw mixture for preparing after raw material mixes for the outer layer of formula ratio, will be in formula ratio
The preparation middle layer raw mixture after preparing raw material mixing of layer, prepares internal layer original for preparing for the internal layer of formula ratio after raw material mixes
Expect mixture；
2) ingredient: by the outer layer raw mixture, middle layer raw mixture, internal layer raw mixture of step 1) preparation by matching
Than carrying out ingredient；
3) blown film: the membrane material coextrusion blow after step 2) ingredient is formed, the degradable composite membrane is obtained.
Preferably, in step 3), the coextrusion blow process is, by outer layer raw mixture, middle layer raw mixture, interior
Layer raw mixture be added according to the ratio three-layer co-extruded inflation film machine it is outer, in, in internal layer hopper, heat and be gradually warmed up, outside
Layer, middle layer, internal layer extrusion temperature control at 150~170 DEG C, such as extrusion temperature be 150 DEG C, 155 DEG C, 160 DEG C, 165 DEG C,
170 DEG C, degradable composite membrane is made through extrusion and blow molding.
Compared with prior art, the invention has the benefit that degradable composite membrane of the invention select three layers it is different
Material and the ratio for passing through every layer of adjusting keep composite membrane flexibility obtained good, have high tensile strength, and degradable；System
Composite membrane tensile strength composite membrane in 90MPa or more, half a year degradation rate up to 99% or more.Of the invention is degradable
The preparation method of composite membrane is simple, and degradable composite membrane obtained quickly can thoroughly degrade when in use.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.
Unless specific instructions, various raw materials of the invention are commercially available buys, or is prepared according to the conventional method of this field
It obtains.
Embodiment 1
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
30%, middle layer weight accounts for the 40% of film gross weight, and interior layer weight accounts for the 30% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 20% LDPE 2420H and 80%；
Middle layer prepares raw material by the LLDPE of 20% LDPE 2420H, 30% LLDPE LL0220AA and 50%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 30% LDPE FT6236,38% MDPE 5401 and 32%
Composition.
The degradable composite membrane of the present embodiment the preparation method is as follows:
1) mixing: preparing outer layer raw mixture for preparing after raw material mixes for the outer layer of formula ratio, will be in formula ratio
The preparation middle layer raw mixture after preparing raw material mixing of layer, prepares internal layer original for preparing for the internal layer of formula ratio after raw material mixes
Expect mixture；
2) ingredient: by the outer layer raw mixture, middle layer raw mixture, internal layer raw mixture of step 1) preparation by matching
Than carrying out ingredient；
3) blown film: by the membrane material after step 2) ingredient be added three-layer co-extruded inflation film machine it is outer, in, internal layer hopper
In, it heats and is gradually warmed up, easily drop is made at 170 DEG C, through extrusion and blow molding in the extrusion temperature control of outer layer, middle layer, internal layer
Solve composite membrane.
Embodiment 2
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
30%, middle layer weight accounts for the 30% of film gross weight, and interior layer weight accounts for the 40% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 30% LDPE 2420H and 70%；
Middle layer prepares raw material by the LLDPE of 30% LDPE 2420H, 20% LLDPE LL0220AA and 50%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 40% LDPE FT6236,30% MDPE 5401 and 30%
Composition.
The preparation method of the degradable composite membrane of the present embodiment is same as Example 1, and details are not described herein.
Embodiment 3
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
40%, middle layer weight accounts for the 30% of film gross weight, and interior layer weight accounts for the 30% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 20% LDPE 2420H and 80%；
Middle layer prepares raw material by the LLDPE of 20% LDPE 2420H, 30% LLDPE LL0220AA and 50%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 20% LDPE FT6236,40% MDPE 5401 and 40%
Composition.
The preparation method of the degradable composite membrane of the present embodiment is same as Example 1, and details are not described herein.
Embodiment 4
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
25%, middle layer weight accounts for the 45% of film gross weight, and interior layer weight accounts for the 30% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 15% LDPE 2420H and 85%；
Middle layer prepares raw material by the LLDPE of 25% LDPE 2420H, 20% LLDPE LL0220AA and 55%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 25% LDPE FT6236,35% MDPE 5401 and 40%
Composition.
The preparation method of the degradable composite membrane of the present embodiment is same as Example 1, and details are not described herein.
Embodiment 5
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
35%, middle layer weight accounts for the 70% of film gross weight, and interior layer weight accounts for the 25% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 20% LDPE 2420H and 80%；
Middle layer prepares raw material by the LLDPE of 10% LDPE 2420H, 30% LLDPE LL0220AA and 60%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 20% LDPE FT6236,40% MDPE 5401 and 40%
Composition.
The preparation method of the degradable composite membrane of the present embodiment is same as Example 1, and details are not described herein.
Embodiment 6
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
20%, middle layer weight accounts for the 50% of film gross weight, and interior layer weight accounts for the 30% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 30% LDPE 2420H and 70%；
Middle layer prepares raw material by the LLDPE of 30% LDPE 2420H, 20% LLDPE LL0220AA and 50%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 40% LDPE FT6236,30% MDPE 5401 and 30%
Composition.
The preparation method of the degradable composite membrane of the present embodiment is same as Example 1, and details are not described herein.
Embodiment 7
The degradable composite membrane of the present embodiment, including outer layer, middle layer, internal layer three parts, outer layer weight account for film gross weight
40%, middle layer weight accounts for the 40% of film gross weight, and interior layer weight accounts for the 20% of film gross weight, wherein by weight percentage,
The raw material for preparing of outer layer is made of the LLDPE LL0220AA of 10% LDPE 2420H and 90%；
Middle layer prepares raw material by the LLDPE of 10% LDPE 2420H, 30% LLDPE LL0220AA and 60%
1002BU composition；
Internal layer prepares raw material by the LLDPE 1002BU of 40% LDPE FT6236,30% MDPE 5401 and 30%
Composition.
The preparation method of the degradable composite membrane of the present embodiment is same as Example 1, and details are not described herein.
Comparative example 1
It is that the raw material of outer layer and proportion are different in place of this comparative example and the difference of embodiment 1, by weight percentage, outside
The raw material for preparing of layer is made of 100% LDPE 2420H.
The preparation method of the composite membrane of this comparative example is same as Example 1, and details are not described herein.
Comparative example 2
It is that the raw material of outer layer and proportion are different in place of this comparative example and the difference of embodiment 1, by weight percentage, outside
The raw material for preparing of layer is made of the LDPE 2420H of 40% MLLDPE 1018MF and 60%.
The preparation method of the composite membrane of this comparative example is same as Example 1, and details are not described herein.
Comparative example 3
It is that the raw material in middle layer is different in place of this comparative example and the difference of embodiment 1, by weight percentage, the system in middle layer
Standby raw material is made of the LLDPE LL0220AA of 30% LDPE 2420H and 70%.
The preparation method of the composite membrane of this comparative example is same as Example 1, and details are not described herein.
Comparative example 4
It is that the raw material in middle layer is different in place of this comparative example and the difference of embodiment 1, by weight percentage, the system in middle layer
Standby raw material is made of the LLDPE 1002BU of 50% LLDPE LL0220AA and 50%.
The preparation method of the composite membrane of this comparative example is same as Example 1, and details are not described herein.
Comparative example 5
It is that the raw material of internal layer and proportion are different in place of this comparative example and the difference of embodiment 1, it is by weight percentage, interior
The raw material for preparing of layer is made of the LLDPE 1002BU for including 50% MLLDPE 1018MA, 20% MDPE 5401 and 30%.
The preparation method of the composite membrane of this comparative example is same as Example 1, and details are not described herein.
Comparative example 6
The composite membrane of this comparative example, including outer layer, middle layer, internal layer three parts, outer layer weight account for the 10% of film gross weight, middle layer
Weight accounts for the 10% of film gross weight, and interior layer weight accounts for the 80% of film gross weight.
The preparation method of the composite membrane of this comparative example is same as Example 1, and details are not described herein.This comparative example and embodiment
It is that the ratio of film gross weight shared by the weight of outer layer, middle layer, internal layer is different in place of 1 difference.
The performance of the embodiment 1-7 and comparative example 1-6 film prepared is tested, test result is as shown in table 1.
Table 1
As it can be seen from table 1 the present invention is by adjusting outer layer, middle layer, the weight of internal layer and every layer of raw material and proportion,
Composite membrane flexibility obtained is good, has high tensile strength, and degradable；The tensile strength of composite membrane obtained is in 90MPa
More than, the degradation rate of composite membrane is up to 99% or more in half a year.The preparation method of degradable composite membrane of the invention is simple, obtained
Degradable composite membrane quickly can thoroughly degrade when in use.
Detailed process equipment and process flow of the invention that the present invention is explained by the above embodiments, but the present invention is not
It is confined to above-mentioned detailed process equipment and process flow, that is, does not mean that the present invention must rely on above-mentioned detailed process equipment and work
Skill process could be implemented.It should be clear to those skilled in the art, any improvement in the present invention, to product of the present invention
The equivalence replacement of each raw material and addition, the selection of concrete mode of auxiliary element etc., all fall within protection scope of the present invention and public affairs
Within the scope of opening.
Claims (10)
1. a kind of degradable composite membrane, including outer layer, middle layer, internal layer three parts, which is characterized in that it is total that the outer layer weight accounts for film
The 20~40% of weight, the middle layer weight account for the 30~50% of film gross weight, and the interior layer weight accounts for the 20~40% of film gross weight,
In, by weight percentage,
The raw material for preparing of the outer layer is made of the LLDPE LL0220AA of 10~30% LDPE 2420H and 70~90%；
The middle layer prepare raw material by 10~30% LDPE 2420H, 20~40% LLDPE LL0220AA and 40~
60% LLDPE 1002BU composition；
The internal layer prepares raw material by 20~40% LDPE FT6236,30~40% MDPE 5401 and 30~40%
LLDPE 1002BU composition.
2. degradable composite membrane according to claim 1, which is characterized in that the outer layer weight accounts for the 30% of film gross weight,
The middle layer weight accounts for the 40% of film gross weight, and the interior layer weight accounts for the 30% of film gross weight.
3. degradable composite membrane according to claim 1 or 2, which is characterized in that by weight percentage, the outer layer
Raw material is prepared to be made of the LLDPE LL0220AA of 15~25% LDPE 2420H and 75~85%.
4. degradable composite membrane described in one of -3 according to claim 1, which is characterized in that by weight percentage, described outer
The raw material for preparing of layer is made of 20% LDPE 2420H, 80% LLDPE LL0220AA.
5. degradable composite membrane described in one of -4 according to claim 1, which is characterized in that by weight percentage, it is described in
Layer prepares raw material by the LLDPE of 15~25% LDPE 2420H, 25~35% LLDPE LL0220AA and 45~55%
1002BU composition.
6. degradable composite membrane described in one of -5 according to claim 1, which is characterized in that by weight percentage, it is described in
The raw material for preparing of layer is made of the LLDPE 1002BU of 20% LDPE 2420H, 30% LLDPE LL0220AA and 50%.
7. degradable composite membrane described in one of -6 according to claim 1, which is characterized in that by weight percentage, described interior
Layer prepares raw material by the LLDPE of 25~35% LDPE FT6236,35~40% MDPE 5401 and 30~35%
1002BU composition.
8. degradable composite membrane described in one of -7 according to claim 1, which is characterized in that by weight percentage, described interior
The raw material for preparing of layer is made of the LLDPE 1002BU of 30% LDPE FT6236,38% MDPE 5401 and 32%.
9. the preparation method of degradable composite membrane described in one of -8 according to claim 1, which is characterized in that the preparation method
Include the following steps:
1) mixing: preparing after raw material mixes for the outer layer of formula ratio is prepared into outer layer raw mixture, by the middle layer of formula ratio
Middle layer raw mixture is prepared after preparing raw material mixing, preparing after raw material mixes for the internal layer of formula ratio is prepared internal layer raw material and mix
Close object；
2) ingredient: by step 1) preparation outer layer raw mixture, middle layer raw mixture, internal layer raw mixture according to the ratio into
Row ingredient；
3) blown film: the membrane material coextrusion blow after step 2) ingredient is formed, the degradable composite membrane is obtained.
10. preparation method as claimed in claim 9, which is characterized in that in step 3), the coextrusion blow process is, will be outer
Layer raw mixture, middle layer raw mixture, internal layer raw mixture be added according to the ratio three-layer co-extruded inflation film machine it is outer,
In, in internal layer hopper, heat and be gradually warmed up, outer layer, middle layer, internal layer extrusion temperature control at 150~170 DEG C, through squeezing out
Degradable composite membrane is made in blow molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811266702.9A CN109397809B (en) | 2018-10-29 | 2018-10-29 | Easily degradable composite film and preparation method thereof |
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| CN110524839A (en) * | 2019-09-09 | 2019-12-03 | 枣阳市东航塑编彩印有限公司 | The preparation method with film is covered in a kind of Polywoven Bag |
| CN112659702A (en) * | 2020-12-22 | 2021-04-16 | 黄山永新股份有限公司 | High-humidity-resistance polyethylene film and production method thereof |
| CN114015143A (en) * | 2021-12-07 | 2022-02-08 | 青岛恒信塑胶有限公司 | PE (polyethylene) blown film for liquid packaging and preparation method thereof |
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| CN114015143A (en) * | 2021-12-07 | 2022-02-08 | 青岛恒信塑胶有限公司 | PE (polyethylene) blown film for liquid packaging and preparation method thereof |
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| CN109397809B (en) | 2021-05-04 |
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