CN109940958A - A kind of composite seal and preparation method thereof for aseptic packaging - Google Patents
A kind of composite seal and preparation method thereof for aseptic packaging Download PDFInfo
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- CN109940958A CN109940958A CN201910287119.4A CN201910287119A CN109940958A CN 109940958 A CN109940958 A CN 109940958A CN 201910287119 A CN201910287119 A CN 201910287119A CN 109940958 A CN109940958 A CN 109940958A
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Abstract
The invention discloses a kind of composite seals for aseptic packaging, comprising: the outer layer prepared by bonding low density polyethylene (LDPE) and support with low density polyethylene blends；The middle layer prepared by high density polyethylene (HDPE) and low density polyethylene blends；Adhesive phase；Ethylene-vinyl alcohol copolymer barrier layer；Another adhesive phase；Another middle layer prepared by high density polyethylene (HDPE) and low density polyethylene blends；And another outer layer prepared by bonding low density polyethylene (LDPE) and support low density polyethylene blends, these layers are laminated in the order described above.The invention also discloses the preparation method of the composite seal and use the packing container of the composite seal.
Description
Technical field
The present invention relates to a kind of composite seals for aseptic packaging, further relate to the preparation side of the sealing material
Method.
Background technique
Food package box is a kind of for holding the packaging of the food such as milk, fruit juice, and wherein content connects with packaging end face
Touching, one side content generate erosion to packaging by end face, reduce packaging intensity；Oxygen in another aspect air, moisture,
Microorganism may also have an impact content quality by end face.
Easily stretchable using Fypro as the sealing strip of middle layer in the prior art, skin-friction coefficient is low, and cuttability is poor.
And it is obstructed, high production cost, thus is had in use certain using smear layer between middle layer and outside heat-sealable material
Limitation.In addition, being the sealing strip of middle layer without individual barrier layer using PET, barrier property is poor.
Therefore, it is necessary to continue technological development, to prepare not easily stretchable, easy cutting in use process and have good
The sealing material of good heat sealability, reliable leakproofness and medium-resistance.
Summary of the invention
To solve the above-mentioned problems, one aspect of the present invention provides a kind of composite seal for aseptic packaging,
Include: be 1 ~ 2 by melt index bonding low density polyethylene (LDPE) and melt index be 2.5 ~ 3.5 support low density polyethylene
The outer layer of alkene blend preparation；The low density polyethylene (LDPE) that the high density polyethylene (HDPE) and melt index for being 1 ~ 2 by melt index are 3 ~ 5
The middle layer of blend preparation；Adhesive phase；Ethylene-vinyl alcohol copolymer barrier layer；Another adhesive phase；It is by melt index
Another middle layer prepared by the low density polyethylene blends that 1 ~ 2 high density polyethylene (HDPE) and melt index is 3 ~ 5；And by melting
Melt the bonding low density polyethylene (LDPE) that index is 1 ~ 2 and the support low density polyethylene blends that melt index is 2.5 ~ 3.5
Another outer layer of preparation, these layers are laminated in the order described above；
Preferably, the composite seal for aseptic packaging, comprising: the bonding low-density for being 1.5 by melt index
Outer layer prepared by the support low density polyethylene blends that polyethylene and melt index are 2.8；The height for being 1.3 by melt index
Middle layer prepared by the low density polyethylene blends that density polyethylene and melt index are 4.5；Adhesive phase；Ethylene-vinyl
Alcohol copolymer barrier layer；Another adhesive phase；The high density polyethylene (HDPE) and melt index for being 1.3 by melt index be 2.8 it is low
Another middle layer of polyamide blend preparation；And by the melt index bonding low density polyethylene (LDPE) that is 1.5 and molten
Melt another outer layer prepared by the support low density polyethylene blends that index is 3.3, these layers are laminated in the order described above.
In one embodiment, the composite seal for aseptic packaging, wherein the outer layer and another
In outer layer, support low density polyethylene that the bonding low density polyethylene (LDPE) and melt index that melt index is 1 ~ 2 are 2.5 ~ 3.5
The weight ratio of alkene is 1:2 ~ 2:1；Preferably, the weight ratio of the two is 3:2.
In one embodiment, the composite seal for aseptic packaging, wherein the middle layer and another
In one middle layer, the weight for the low density polyethylene blends that the high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2 are 3 ~ 5
Amount is than being 1:2 ~ 2:1；Preferably, the weight ratio of the two is 3:7.
In one embodiment, the high density polyethylene (HDPE) and melt index that the melt index is 1 ~ 2 be 3 ~ 5 it is low close
The elongation at break for spending polyethylene is 400 ~ 1000；Preferably, the elongation at break of the two is 650.
In one embodiment, described adhesive layer and another adhesive phase are made of adhesive, and described adhesive is
Ethylene-vinyl acetate copolymer, by using metal ion crosslinked molecule to prepare in ethylene-methyl methacrylate vinyl copolymer
Contain iolon, ethylene methacrylic acid copolymer, ethylene-acrylate rubber, ethene-vinyl acetate copolymer, liquid
State modified rubber adhesive glue, poly- pyrrole throat/composite adhered glue of polyetheramine/polyquaternium, anhydride modified linear low density polyethylene
(LLDPE) resin, elastic microsphere high-strength adhesive glue and modified Nano bind particles glue and pass through modified any of the above-described substance
One of resulting substance or any combination thereof.
In one embodiment, the composite seal for aseptic packaging, wherein the thickness of each tunic are as follows:
10~20 microns of outer layer；8~12 microns of middle layer；3~10 microns of adhesive phase；2~7 microns of barrier layer；Another middle layer 8~
12 microns；10~20 microns of another outer layer；Preferably, the composite seal for aseptic packaging, wherein each tunic
Thickness are as follows: 15 microns of outer layer；10.5 microns of middle layer；8 microns of adhesive phase；5 microns of barrier layer；Another adhesive phase 8 is micro-
Rice；10.5 microns of another middle layer；15 microns of another outer layer.
Another aspect of the present invention provides a kind of method for manufacturing composite seal, comprising the following steps:
According to sequence co-extrusion pressure following component as described below: the bonding low density polyethylene (LDPE) and melting that melt index is 1 ~ 2
The support low density polyethylene blends that index is 2.5 ~ 3.5；The high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2
For 3 ~ 5 low density polyethylene blends；Adhesive；Ethylene-vinyl alcohol copolymer；Adhesive；Melt index be 1 ~ 2 it is highly dense
Polyethylene and melt index are spent for 3 ~ 5 low density polyethylene blends；The bonding low density polyethylene (LDPE) that melt index is 1 ~ 2
The support low density polyethylene blends for being 2.5 ~ 3.5 with melt index；And
Composite seal is obtained, the composite seal is layered product, comprising: the bonding for being 1 ~ 2 by melt index is with low
Outer layer prepared by the support low density polyethylene blends that density polyethylene and melt index are 2.5 ~ 3.5；By melt index
The middle layer for the low density polyethylene blends preparation that high density polyethylene (HDPE) and melt index for 1 ~ 2 are 3 ~ 5；Adhesive phase；
Ethylene-vinyl alcohol copolymer barrier layer；Another adhesive phase；High density polyethylene (HDPE) and melt index by melt index for 1 ~ 2
For another middle layer of 3 ~ 5 low density polyethylene blends preparation；And it is poly- by the bonding low-density that melt index is 1 ~ 2
Another outer layer prepared by the support low density polyethylene blends that ethylene and melt index are 2.5 ~ 3.5, these layers are according to upper
Sequence is stated to be laminated.
Another aspect of the present invention provides a kind of packing container using the composite seal.
The above-mentioned of the application and other features, aspects and advantages are more readily understood with reference to following detailed description.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the composite seal that the embodiment of the present invention 7 provides.
Wherein:
1. bonding is (molten with low density polyethylene (LDPE) (melt index 1.5,0.918 g/cm3 of density) and support low density polyethylene (LDPE)
Melt index 2.8,0.925 g/cm3 of density) weight ratio be 3/2 blend outer layer.
2. 0.953 g/cm3 of density) with low density polyethylene (LDPE) (melt index 4.5, density 0.923g/cm3) weight ratio be
3/7 middle layer.
3. adhesive phase (polyurethane/composite adhered glue of polyetheramine/polyquaternium).
4. the barrier layer of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %).
5. another adhesive phase (poly- pyrrole throat/composite adhered glue of polyetheramine/polyquaternium), (melting refers to high density polyethylene (HDPE)
Number 2.0,0.954 g/cm3 of density) it with low density polyethylene (LDPE) (melt index 5.0, density 0.916g/cm3) weight ratio is 2/1
Another middle layer.
6. high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) and low density polyethylene (LDPE) (melt index
5.0, density 0.916g/cm3) weight ratio be 2/1 another middle layer.
7. bonding low density polyethylene (LDPE) (melt index 2.0,0.922 g/cm3 of density) and support low density polyethylene
Alkene (melt index 3.5,0.918 g/cm3 of density) weight ratio is another outer layer of 2/1 blend.
Specific embodiment
The detailed description for preferred implementation method of the invention below of participating in the election of and including embodiment this public affairs can be more easily to understand
Open content.A large amount of terms can be referred in following description and claims, these terms are defined as following meanings.
Singular includes that plural number discusses object, unless the context clearly dictates otherwise.
" optional " or " optionally " refer to that the item described thereafter or event may or may not occur, and this is retouched
State the situation that situation and event including event generation do not occur.
In present specification and claims, range restriction can be combined and/or be exchanged, if without in addition saying
These bright ranges include all subranges contained therebetween.
" polymer blend " refers to the different homopolymer of two or more molecular structure, copolymer or homopolymer and is total to
The physical mixture of polymers.There is no the connection of covalent bond between the macromolecular of general two component.The mixing of polymer is to absorb heat
Journey is the heterogeneous system being dispersed in another polymer by a kind of polymer.The purpose of blending is prepared in certain property
Can on improve to some extent or it is unique can polymer material.Polymer blend is a kind of heterogeneous polymerization occurred earliest
Object.Early in early 20th century, just there is the patent report that shock proof polystyrene is made by being blended.It is blended in technique more simple
Single, the range of choice of component is larger, the new material with property is made with can be convenient, so have developed rapidly.
The first aspect of the invention provides a kind of composite seal that function is fabulous, which is layer
Laminate, comprising: the support that the bonding low density polyethylene (LDPE) and melt index for being 1 ~ 2 by melt index are 2.5 ~ 3.5 is with low close
Spend the outer layer of polyethylene blend preparation；The low-density that the high density polyethylene (HDPE) and melt index for being 1 ~ 2 by melt index are 3 ~ 5
The middle layer of polyethylene blend preparation；Adhesive phase；Ethylene-vinyl alcohol copolymer barrier layer；Another adhesive phase；By melting
Another middle layer for the low density polyethylene blends preparation that the high density polyethylene (HDPE) and melt index that index is 1 ~ 2 are 3 ~ 5；With
And the support low density polyethylene (LDPE) that the bonding low density polyethylene (LDPE) and melt index for by melt index being 1 ~ 2 are 2.5 ~ 3.5
Another outer layer of blend preparation, these layers are laminated in the order described above；
Preferably, the composite seal for aseptic packaging, comprising: the bonding low-density for being 1.5 by melt index
Outer layer prepared by the support low density polyethylene blends that polyethylene and melt index are 2.8；The height for being 1.3 by melt index
Middle layer prepared by the low density polyethylene blends that density polyethylene and melt index are 4.5；Adhesive phase；Ethylene-vinyl
Alcohol copolymer barrier layer；Another adhesive phase；The high density polyethylene (HDPE) and melt index for being 1.3 by melt index be 2.8 it is low
Another middle layer of polyamide blend preparation；And by the melt index bonding low density polyethylene (LDPE) that is 1.5 and molten
Melt another outer layer prepared by the support low density polyethylene blends that index is 3.3, these layers are laminated in the order described above.
In one embodiment, the composite seal for aseptic packaging, wherein the outer layer and another
In outer layer, support low density polyethylene that the bonding low density polyethylene (LDPE) and melt index that melt index is 1 ~ 2 are 2.5 ~ 3.5
The weight ratio of alkene is 1:2 ~ 2:1；Preferably, the weight ratio of the two is 3:2.
In one embodiment, the composite seal for aseptic packaging, wherein the middle layer and another
In one middle layer, the weight for the low density polyethylene blends that the high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2 are 3 ~ 5
Amount is than being 1:2 ~ 2:1；Preferably, the weight ratio of the two is 3:7.
In one embodiment, the high density polyethylene (HDPE) and melt index that the melt index is 1 ~ 2 be 3 ~ 5 it is low close
The elongation at break for spending polyethylene is 400 ~ 1000；Preferably, the elongation at break of the two is 650.
Such as above-mentioned composite seal has special seven-layer structure, and the chemical composition of outer layer and middle layer is variable, with
The cohesive force in composite seal between each layer is adjusted, therefore significant technical effect of the invention can be provided.
In one embodiment, for being laminated the barrier layer of composite seal as described above and the bonding tree of middle layer
Rouge (adhesive) is for example, ethylene-vinyl acetate copolymer, or by using in ethylene-methyl methacrylate vinyl copolymer
The preparation of metal ion crosslinked molecule contains iolon, ethylene methacrylic acid copolymer, ethylene-acrylate rubber, second
Alkene-vinyl acetate copolymer, the modified adhesive glue of liquid rubber, poly- pyrrole throat/composite adhered glue of polyetheramine/polyquaternium, elasticity are micro-
Ball high-strength adhesive glue and modified Nano bind particles glue and pass through one of modified any of the above-described resulting substance of substance
Or any combination thereof.
The functional group that there is these binder resins more graft reaction to introduce, functional group abundant can be with abutting base
The compatible of resin, increase with the binding force of middle layer, prevent from causing film stripping during tearing, occur film residual or
The problems such as poor appearance of wire drawing and release surface.
In one embodiment, the composite seal for aseptic packaging, wherein the thickness of each tunic are as follows:
10~20 microns of outer layer；8~12 microns of middle layer；3~10 microns of adhesive phase；2~7 microns of barrier layer；Another middle layer 8~
12 microns；10~20 microns of another outer layer；Preferably, the composite seal for aseptic packaging, wherein each tunic
Thickness are as follows: 15 microns of outer layer；10.5 microns of middle layer；8 microns of adhesive phase；5 microns of barrier layer；Another adhesive phase 8 is micro-
Rice；10.5 microns of another middle layer；15 microns of another outer layer.
Another aspect of the present invention provides a kind of method for manufacturing composite seal, comprising the following steps:
According to sequence co-extrusion pressure following component as described below: the bonding low density polyethylene (LDPE) and melting that melt index is 1 ~ 2
The support low density polyethylene blends that index is 2.5 ~ 3.5；The high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2
For 3 ~ 5 low density polyethylene blends；Adhesive；Ethylene-vinyl alcohol copolymer；Adhesive；Melt index be 1 ~ 2 it is highly dense
Polyethylene and melt index are spent for 3 ~ 5 low density polyethylene blends；The bonding low density polyethylene (LDPE) that melt index is 1 ~ 2
The support low density polyethylene blends for being 2.5 ~ 3.5 with melt index；And
Composite seal is obtained, the composite seal is layered product, comprising: the bonding for being 1 ~ 2 by melt index is with low
Outer layer prepared by the support low density polyethylene blends that density polyethylene and melt index are 2.5 ~ 3.5；By melt index
The middle layer for the low density polyethylene blends preparation that high density polyethylene (HDPE) and melt index for 1 ~ 2 are 3 ~ 5；Adhesive phase；
Ethylene-vinyl alcohol copolymer barrier layer；Another adhesive phase；High density polyethylene (HDPE) and melt index by melt index for 1 ~ 2
For another middle layer of 3 ~ 5 low density polyethylene blends preparation；And it is poly- by the bonding low-density that melt index is 1 ~ 2
Another outer layer prepared by the support low density polyethylene blends that ethylene and melt index are 2.5 ~ 3.5, these layers are according to upper
Sequence is stated to be laminated.
Another aspect of the present invention provides a kind of packing container using the composite seal.
Referring to specific example the present invention is described in detail.
Raw material:
Embodiment 1
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 1.0,0.920 g/ of density
Cm3) with support with low density polyethylene (LDPE) (melt index 2.5,0.923 g/cm3 of density) weight ratio be 1/2 blend outer layer,
High density polyethylene (HDPE) (melt index 1.0,0.95 g/cm3 of density) and low density polyethylene (LDPE) (melt index 3.0, density
Middle layer that 0.925g/cm3) weight ratio is 1/2, the adhesive phase (ADMER of Mitsui Chemicals, Inc production
NF559), barrier layer, another adhesive phase (Mitsui of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %)
Chemicals, Inc production ADMER NF559), high density polyethylene (HDPE) (melt index 1.0,0.95 g/cm3 of density) with it is low
Another middle layer that density polyethylene (melt index 3.0, density 0.925g/cm3) weight ratio is 1/2, bonding low-density are poly-
Ethylene (melt index 1.0,0.920 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 2.5, density 0.923g/
Cm3) weight ratio is another outer layer of 1/2 blend.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 10 that the plural layers being molded, which have,
2 microns of 8 microns/adhesive layer of micron/middle layer, 3 microns/barrier layer/another 3 microns of adhesive layer/8 microns of another middle layer/
The layered structure of 10 microns of another outer layer.
Embodiment 2
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 2.0, density 0.922g/
Cm3) with support with low density polyethylene (LDPE) (melt index 3.5,0.918 g/cm3 of density) weight ratio be 1/2 blend outer layer,
High density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) and low density polyethylene (LDPE) (melt index 5.0, density
Middle layer that 0.916g/cm3) weight ratio is 1/2, the adhesive phase (ADMER of Mitsui Chemicals, Inc production
NF559), barrier layer, another adhesive phase (Mitsui of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %)
Chemicals, Inc production ADMER NF559), high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) with it is low
Another middle layer that density polyethylene (melt index 5.0, density 0.916g/cm3) weight ratio is 1/2, bonding low-density are poly-
Ethylene (melt index 2.0,0.922 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 3.5, density 0.918
G/cm3) weight ratio is another outer layer of 1/2 blend.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 20 that the plural layers being molded, which have,
7 microns of 12 microns/adhesive layer of micron/middle layer, 10 microns/barrier layer/another 10 microns of adhesive layer/another middle layer 12 is micro-
Rice/another 20 microns of outer layer of layered structure.
Embodiment 3
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 2.0, density 0.922g/
Cm3) with support with low density polyethylene (LDPE) (melt index 3.5,0.918 g/cm3 of density) weight ratio be 2/1 blend outer layer,
High density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) and low density polyethylene (LDPE) (melt index 5.0, density
Middle layer that 0.916g/cm3) weight ratio is 2/1, the adhesive phase (ADMER of Mitsui Chemicals, Inc production
NF559), barrier layer, another adhesive phase (Mitsui of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %)
Chemicals, Inc production ADMER NF559), high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) with it is low
Another middle layer that density polyethylene (melt index 5.0, density 0.916g/cm3) weight ratio is 2/1, bonding low-density are poly-
Ethylene (melt index 2.0,0.922 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 3.5, density 0.918
G/cm3) weight ratio is another outer layer of 2/1 blend.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 20 that the plural layers being molded, which have,
7 microns of 12 microns/adhesive layer of micron/middle layer, 10 microns/barrier layer/another 10 microns of adhesive layer/another middle layer 12 is micro-
Rice/another 20 microns of outer layer of layered structure.
Embodiment 4
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 1.5, density 0.918g/
Cm3) with support with low density polyethylene (LDPE) (melt index 2.8,0.925 g/cm3 of density) weight ratio be 2/1 blend outer layer,
High density polyethylene (HDPE) (melt index 1.3,0.953 g/cm3 of density) and low density polyethylene (LDPE) (melt index 4.5, density
Middle layer that 0.923g/cm3) weight ratio is 2/1, the adhesive phase (ADMER of Mitsui Chemicals, Inc production
NF559), barrier layer, another adhesive phase (Mitsui of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %)
Chemicals, Inc production ADMER NF559), high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) with it is low
Another middle layer that density polyethylene (melt index 5.0, density 0.916g/cm3) weight ratio is 2/1, bonding low-density are poly-
Ethylene (melt index 2.0,0.922 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 3.5, density 0.918
G/cm3) weight ratio is another outer layer of 2/1 blend.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 20 that the plural layers being molded, which have,
7 microns of 12 microns/adhesive layer of micron/middle layer, 10 microns/barrier layer/another 10 microns of adhesive layer/another middle layer 12 is micro-
Rice/another 20 microns of outer layer of layered structure.
Embodiment 5
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 1.5, density 0.918g/
Cm3) with support with low density polyethylene (LDPE) (melt index 2.8,0.925 g/cm3 of density) weight ratio be 3/2 blend outer layer,
High density polyethylene (HDPE) (melt index 1.3,0.953 g/cm3 of density) and low density polyethylene (LDPE) (melt index 4.5, density
Middle layer that 0.923g/cm3) weight ratio is 3/7, the adhesive phase (ADMER of Mitsui Chemicals, Inc production
NF559), barrier layer, another adhesive phase (Mitsui of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %)
Chemicals, Inc production ADMER NF559), high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) with it is low
Another middle layer that density polyethylene (melt index 5.0, density 0.916g/cm3) weight ratio is 2/1, bonding low-density are poly-
Ethylene (melt index 2.0,0.922 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 3.5, density 0.918
G/cm3) weight ratio is another outer layer of 2/1 blend.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 20 that the plural layers being molded, which have,
7 microns of 12 microns/adhesive layer of micron/middle layer, 10 microns/barrier layer/another 10 microns of adhesive layer/another middle layer 12 is micro-
Rice/another 20 microns of outer layer of layered structure.
Embodiment 6
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 1.5, density 0.918g/
Cm3) with support with low density polyethylene (LDPE) (melt index 2.8,0.925 g/cm3 of density) weight ratio be 3/2 blend outer layer,
High density polyethylene (HDPE) (melt index 1.3,0.953 g/cm3 of density) and low density polyethylene (LDPE) (melt index 4.5, density
Middle layer that 0.923g/cm3) weight ratio is 3/7, the adhesive phase (ADMER of Mitsui Chemicals, Inc production
NF559), barrier layer, another adhesive phase (Mitsui of ethylene-vinyl alcohol copolymer (EVOH, ethylene contents are 40 moles of %)
Chemicals, Inc production ADMER NF559), high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) with it is low
Another middle layer that density polyethylene (melt index 5.0, density 0.916g/cm3) weight ratio is 2/1, bonding low-density are poly-
Ethylene (melt index 2.0,0.922 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 3.5, density 0.918
G/cm3) weight ratio is another outer layer of 2/1 blend.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 15 that the plural layers being molded, which have,
5 microns of 10.5 microns/adhesive layer of micron/middle layer, 8 microns/barrier layer/another 8 microns of adhesive layer/another middle layer 10.5 is micro-
Rice/another 15 microns of outer layer of layered structure.
Embodiment 7
Each layer for preparing composite seal is respectively as follows: bonding low density polyethylene (LDPE) (melt index 1.5,0.918 g/ of density
Cm3) with support with low density polyethylene (LDPE) (melt index 2.8,0.925 g/cm3 of density) weight ratio be 3/2 blend outer layer,
High density polyethylene (HDPE) (melt index 1.3,0.953 g/cm3 of density) and low density polyethylene (LDPE) (melt index 4.5, density
0.923g/cm3) weight ratio be 3/7 middle layer, adhesive phase (polyurethane/composite adhered glue of polyetheramine/polyquaternium), second
The barrier layer of alkene-ethenol copolymer (EVOH, ethylene contents be 40 moles of %), another adhesive phase (poly- pyrrole throat/polyetheramine/
The composite adhered glue of polyquaternium), high density polyethylene (HDPE) (melt index 2.0,0.954 g/cm3 of density) and low density polyethylene (LDPE)
(melt index 5.0, density 0.916g/cm3) weight ratio be 2/1 another middle layer, bonding with low density polyethylene (LDPE), (melting refers to
Number 2.0,0.922 g/cm3 of density) and support low density polyethylene (LDPE) (melt index 3.5,0.918 g/cm3 of density) weight ratio
For another outer layer of 2/1 blend；
The poly- pyrrole throat/composite adhered glue of polyetheramine/polyquaternium is prepared by following steps:
(1) poly- pyrrole throat prepolymer is prepared
In 100mL dry three-necked bottle, the 1 of 0.01 mole, 3,5- tri- (4- naphthoxy -1,8- diacid) benzene, three acid anhydride are sequentially added
It with 50mL metacresol, stirs under nitrogen protection, after three acid anhydrides are completely dissolved, 0.005 mole of 3,3 '-benzidines is added
Amine after 20min is stirred at room temperature, is heated to 85 DEG C, reacts 6h, then at 180 DEG C, reacts 15h；After reaction, it is down to
Room temperature, and pour into rapidly in 1000mL methanol, obtain a large amount of solid precipitatings；After washing the product repeatedly with methanol, filters and receive
Collect polymer, in vacuum drying oven, 120 DEG C drying 24 hours to get poly- pyrrole throat prepolymer；
(2) polyetheramine prepolymer is prepared
In 2000mL dry three-necked bottle, sequentially add 100 grams epoxy resin E51,0.27mol benzylamine and 900 gram two
Methyl sulfoxide leads to nitrogen protection and magnetic agitation；After 3h is stirred at room temperature, heats up 90 DEG C and react 4h, after reaction, be down to room
Temperature, and pour into rapidly in 1000mL deionized water, obtain a large amount of solid precipitatings；After washing the product repeatedly with deionized water, take out
Filter and collected polymer, in vacuum drying oven, 40 DEG C drying 48 hours, obtain polyetheramine prepolymer；
(3) polyquaternium prepolymer is prepared
In 1000ml dry three-necked bottle, be added 1,12- dibromo-dodecane 0.1mol, Isosorbide-5-Nitrae-lupetazin 0.095mol with
And solvent dimethyl sulfoxide 100ml, after reacting 3 hours at 60 DEG C, vacuum distillation removal solvent obtains polyquaternium prepolymer；
(4) poly- pyrrole throat/composite adhered glue of polyetheramine/polyquaternium is prepared
In 100mL dry three-necked bottle, sequentially add 1 gram the poly- pyrrole throat prepolymer, 1.5 grams described amino-terminated poly-
Ether amines, 0.5 gram of the polyquaternium prepolymer, 50mL dimethyl sulfoxide, under nitrogen protection stir 30min after, heating
To 80 DEG C, 7h is reacted, then at 120 DEG C, reacts 6h；After reaction, vacuum distillation removal dimethyl sulfoxide, is then down to room
Temperature is simultaneously poured into rapidly in 25mL deionized water, obtains vitreosol to get poly- pyrrole throat/composite adhered glue of polyetheramine/polyquaternium.
Resin as described above is heated and melts, the resin of fusing according to bonding low density polyethylene (LDPE) and is supported with low close
Spend polyethylene blend/high density polyethylene (HDPE) and low density polyethylene blends/adhesive/ethylene-vinyl alcohol copolymer/bonding
Oxidant layer/high density polyethylene (HDPE) and low density polyethylene blends/bonding low density polyethylene (LDPE) and support low density polyethylene (LDPE)
The sequence of blend is filled in co-extrusion compression mould, and is molded into film.It includes outer layer 15 that the plural layers being molded, which have,
5 microns of 10.5 microns/adhesive layer of micron/middle layer, 8 microns/barrier layer/another 8 microns of adhesive layer/another middle layer 10.5 is micro-
Rice/another 15 microns of outer layer of layered structure.
Comparative example 1
According to the identical method preparation of embodiment 3 in patent CN103009753A, film thickness is 80 microns.
Measuring method
Thickness: GB/T6672-2001ISO4592)；
Tensile strength: GB/T13022-1991ASTMD882；
Elongation at break: GB/T13022-1991ASTMD882；
Peel strength: GB/T8808-1998；
Heat seal strength (115 DEG C~150 DEG C): ASTMD2029；
OTR oxygen transmission rate: GB/T19789-2005；ASTMD3985
Water vapour permeability: GB/T26253-2010；ISO-15106-2-2003
Cutting test: according to the method for patent CN104608450A, using above-mentioned sealing material as interior band, and band is equal in every kind
1000 samples are taken, and measure the quantity of wherein qualified samples, the results are shown in Table 1.
Table 1
At the same time, it is 47Mpa that the test result of comparative example 1, which is tensile strength, elongation at break 180%, and peel strength is
8N/15mm, (115 DEG C~150 DEG C) of heat seal strength are 40N/15mm, OTR oxygen transmission rate 100cc/m2.24hr, water vapour transmission
Rate is 7g/m2.24hr, and unqualified quantity is 157.This shows the sealing material manufactured in example 1-7 and patent
The product of CN103009753A is compared, and obvious preferably comprehensive performance and finished product rate are provided, thus provides this hair
Bright advantageous effects.
Example above-mentioned is merely illustrative, some features of the feature for explaining the disclosure.The attached claims
It is intended to the range as wide as possible for requiring to be contemplated that, and embodiments as presented herein is only according to all possible embodiment
Combined selection embodiment explanation.Therefore, the purpose of applicant is that the attached claims are not illustrated the present invention
Feature exemplary selectional restriction.And the progress in science and technology will be formed language express it is inaccurate due to and not
The possible equivalent being presently considered or son replacement, and these variations should also be interpreted in the conceived case by appended
Claim covering.
Claims (10)
1. a kind of composite seal for aseptic packaging, comprising: the bonding low density polyethylene (LDPE) for being 1 ~ 2 by melt index
Outer layer prepared by the support low density polyethylene blends for being 2.5 ~ 3.5 with melt index；By melt index be 1 ~ 2 it is highly dense
Middle layer prepared by the low density polyethylene blends that degree polyethylene and melt index are 3 ~ 5；Adhesive phase；Ethylene-vinyl alcohol
Copolymer barrier layer；Another adhesive phase；The high density polyethylene (HDPE) and melt index for being 1 ~ 2 by melt index be 3 ~ 5 it is low close
Spend another middle layer of polyethylene blend preparation；And bonding low density polyethylene (LDPE) and melting by melt index for 1 ~ 2
Another outer layer prepared by the support low density polyethylene blends that index is 2.5 ~ 3.5, these layers are laminated in the order described above.
2. the composite seal of aseptic packaging is used for as described in claim 1, wherein melting in the outer layer and another outer layer
Melt the weight of the bonding low density polyethylene (LDPE) that index is 1 ~ 2 and the support low density polyethylene (LDPE) that melt index is 2.5 ~ 3.5
Than for 1:2 ~ 2:1.
3. the composite seal of aseptic packaging is used for as claimed in claim 2, wherein melting in the outer layer and another outer layer
Melt the weight of the bonding low density polyethylene (LDPE) that index is 1 ~ 2 and the support low density polyethylene (LDPE) that melt index is 2.5 ~ 3.5
Than for 3:2.
4. the composite seal of aseptic packaging is used for as described in claim 1, wherein the middle layer and another middle layer
In, the weight ratio for the low density polyethylene blends that the high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2 are 3 ~ 5 is 1:
2~2:1。
5. the composite seal of aseptic packaging is used for as claimed in claim 4, wherein the middle layer and another middle layer
In, the weight ratio for the low density polyethylene blends that the high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2 are 3 ~ 5 is 3:
7。
6. as described in claim 1 be used for aseptic packaging composite seal, wherein the melt index be 1 ~ 2 it is highly dense
The elongation at break for the low density polyethylene (LDPE) that degree polyethylene and melt index are 3 ~ 5 is 400 ~ 1000.
7. being used for the composite seal of aseptic packaging, wherein described adhesive layer and another bonding as described in claim 1
Oxidant layer is made of adhesive, and described adhesive is ethylene-vinyl acetate copolymer, by ethylene-methyl methacrylate ethylene system
Contain iolon, ethylene methacrylic acid copolymer, ethylene, propylene with prepared by metal ion crosslinked molecule in copolymer
Acid esters rubber, ethene-vinyl acetate copolymer, the modified adhesive glue of liquid rubber, poly- pyrrole throat/polyetheramine/polyquaternium are compound viscous
Close glue, anhydride modified linear low density polyethylene (LLDPE) resin, elastic microsphere high-strength adhesive glue and modified Nano
Bind particles glue and pass through one of modified any of the above-described resulting substance of substance or any combination thereof.
8. the composite seal of aseptic packaging is used for as described in claim 1, wherein the thickness of each tunic are as follows: outer layer 10~
20 microns；8~12 microns of middle layer；3~10 microns of adhesive phase；2~7 microns of barrier layer；Another adhesive phase 3~10 is micro-
Rice；8~12 microns of another middle layer；10~20 microns of another outer layer.
9. a kind of method for manufacturing composite seal, comprising the following steps:
According to sequence co-extrusion pressure following component as described below: the bonding low density polyethylene (LDPE) and melting that melt index is 1 ~ 2
The support low density polyethylene blends that index is 2.5 ~ 3.5；The high density polyethylene (HDPE) and melt index that melt index is 1 ~ 2
For 3 ~ 5 low density polyethylene blends；Adhesive；Ethylene-vinyl alcohol copolymer；Adhesive；Melt index be 1 ~ 2 it is highly dense
Polyethylene and melt index are spent for 3 ~ 5 low density polyethylene blends；The bonding low density polyethylene (LDPE) that melt index is 1 ~ 2
The support low density polyethylene blends for being 2.5 ~ 3.5 with melt index；And
Composite seal is obtained, the composite seal is layered product, comprising: the bonding for being 1 ~ 2 by melt index is with low
Outer layer prepared by the support low density polyethylene blends that density polyethylene and melt index are 2.5 ~ 3.5；By melt index
The middle layer for the low density polyethylene blends preparation that high density polyethylene (HDPE) and melt index for 1 ~ 2 are 3 ~ 5；Adhesive phase；
Ethylene-vinyl alcohol copolymer barrier layer；Another adhesive phase；High density polyethylene (HDPE) and melt index by melt index for 1 ~ 2
For another middle layer of 3 ~ 5 low density polyethylene blends preparation；And it is poly- by the bonding low-density that melt index is 1 ~ 2
Another outer layer prepared by the support low density polyethylene blends that ethylene and melt index are 2.5 ~ 3.5, these layers are according to upper
Sequence is stated to be laminated.
10. a kind of packing container using composite seal as described in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287119.4A CN109940958A (en) | 2019-04-11 | 2019-04-11 | A kind of composite seal and preparation method thereof for aseptic packaging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287119.4A CN109940958A (en) | 2019-04-11 | 2019-04-11 | A kind of composite seal and preparation method thereof for aseptic packaging |
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| CN109940958A true CN109940958A (en) | 2019-06-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106985319A (en) * | 2017-03-21 | 2017-07-28 | 上海迈高新材料科技有限公司 | A kind of method that use the tape casting prepares aseptic packaging composite seal |
-
2019
- 2019-04-11 CN CN201910287119.4A patent/CN109940958A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106985319A (en) * | 2017-03-21 | 2017-07-28 | 上海迈高新材料科技有限公司 | A kind of method that use the tape casting prepares aseptic packaging composite seal |
Non-Patent Citations (1)
| Title |
|---|
| 李良: "《食品包装学》", 31 July 2017, 中国轻工业出版社 * |
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