CN118024700A - Double-pull poly adipic acid-butylene terephthalate biodegradable winding film - Google Patents
Double-pull poly adipic acid-butylene terephthalate biodegradable winding film Download PDFInfo
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- CN118024700A CN118024700A CN202410382322.0A CN202410382322A CN118024700A CN 118024700 A CN118024700 A CN 118024700A CN 202410382322 A CN202410382322 A CN 202410382322A CN 118024700 A CN118024700 A CN 118024700A
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- 238000004804 winding Methods 0.000 title claims abstract description 62
- UZBRNILSUGWULW-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione;hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.O=C1OCCCCOC(=O)C2=CC=C1C=C2 UZBRNILSUGWULW-UHFFFAOYSA-N 0.000 title abstract description 11
- 239000010410 layer Substances 0.000 claims abstract description 86
- 239000012792 core layer Substances 0.000 claims abstract description 31
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 26
- 239000004417 polycarbonate Substances 0.000 claims abstract description 26
- -1 polypropylene carbonates Polymers 0.000 claims abstract description 25
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 20
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 20
- 239000004970 Chain extender Substances 0.000 claims abstract description 18
- JQYSLXZRCMVWSR-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione;terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1.O=C1CCCCC(=O)OCCCCO1 JQYSLXZRCMVWSR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 229920000379 polypropylene carbonate Polymers 0.000 claims abstract description 7
- 239000004629 polybutylene adipate terephthalate Substances 0.000 claims description 49
- 238000005266 casting Methods 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical group CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000009998 heat setting Methods 0.000 claims description 6
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 5
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 2
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 150000005846 sugar alcohols Polymers 0.000 claims 1
- 229920005586 poly(adipic acid) Polymers 0.000 abstract description 7
- 239000005022 packaging material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 7
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- 238000012360 testing method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012858 packaging process Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012793 heat-sealing layer Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- 150000004072 triols Chemical group 0.000 description 2
- 229920002261 Corn starch Polymers 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000909 polytetrahydrofuran Polymers 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 229920006302 stretch film Polymers 0.000 description 1
Classifications
-
- 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
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- Laminated Bodies (AREA)
Abstract
The invention provides a double-pull poly (adipic acid) -butylene terephthalate biodegradable winding film, which belongs to the field of packaging materials, and comprises the following components in percentage by weight: an inner layer, a core layer and an outer layer which are sequentially arranged; the inner layer and the outer layer respectively comprise 50-94.5% of poly (butylene adipate-terephthalate), 5-49.7% of bio-based polycarbonate, 0.1-2% of antioxidant, 0.1-0.5% of slipping agent, 0.1-2% of compatilizer and 100% in total by mass percent; the core layer is an intermediate layer and comprises 96-99.8% of poly (butylene adipate-terephthalate), 0.1-2% of chain extender, 0.1-2% of antioxidant and 100% of total weight percent; wherein the bio-based polycarbonate is selected from the group consisting of polypropylene carbonates.
Description
Technical Field
The invention belongs to the field of packaging materials, and particularly relates to a biodegradable winding film of double-pull poly (adipic acid) -butylene terephthalate.
Background
Wound films, also known as stretch films, compactly and fixedly bundle the products into a unit by virtue of the strong winding force and retractivity of the film. The winding film commonly used at present mainly uses Polyethylene (PE) as a main raw material, and the winding film prepared by the winding film has higher tensile strength and tear strength, but has the problems of environmental pollution due to large usage amount, difficult degradation and the like. The polybutylene adipate-terephthalate (PBAT) is a biodegradable material, has high productivity, has properties close to those of polyethylene and polypropylene, and is an ideal substitute material for preparing winding films. At present, a PBAT film prepared by a tape casting method is already available in the market and is applied to the field of winding films, but the longitudinal tensile strength and the transverse tensile strength of the PBAT film are low, and the PBAT film is easy to break in the process of multi-layer winding stretching, so that the winding films are damaged. Meanwhile, the tensile strength is lower and is only 10-40MPa generally, so that the use amount is required to be increased when partial heavy objects are packaged, and the use cost is increased intangibly. The existing poly (adipic acid-butylene terephthalate) (BOPBAT) film prepared by adopting the biaxial stretching process has lower viscosity, is difficult to realize tight winding and has higher cost.
Disclosure of Invention
Aiming at the technical problems, the invention provides a biodegradable winding film of double-pull poly (adipic acid-butylene terephthalate), so as to at least partially solve the technical problems.
The invention provides a double-pull poly (adipic acid) -butylene terephthalate biodegradable winding film, which comprises: an inner layer, a core layer and an outer layer which are sequentially arranged;
The inner layer and the outer layer respectively comprise 50-94.5% of poly (butylene adipate-terephthalate), 5-49.7% of bio-based polycarbonate, 0.1-2% of antioxidant, 0.1-0.5% of slipping agent, 0.1-2% of compatilizer and 100% in total by mass percent;
The core layer is an intermediate layer and comprises 96-99.8% of poly (butylene adipate-terephthalate), 0.1-2% of chain extender, 0.1-2% of antioxidant and 100% of total weight percent; wherein the bio-based polycarbonate is selected from the group consisting of polypropylene carbonates.
Based on the technical scheme, the biodegradable winding film of the double-pull poly (adipic acid) -butylene terephthalate provided by the invention has at least one of the following beneficial effects:
(1) In the embodiment of the invention, the bio-based polycarbonate is added into the raw materials of the inner layer and the outer layer in the process of synthesizing the wound film so as to enhance the viscosity of the wound film and have environmental friendliness, and the cost of the wound film can be reduced by using the PBAT with higher purity as the main raw material of the core layer.
(2) In the embodiment of the invention, the PBAT winding film prepared by adopting the inner layer, the core layer and the outer layer raw materials and adopting the biaxial stretching process has higher mechanical property and optical property compared with the PBAT film prepared by the existing tape casting method, and has higher viscosity compared with the double-pull PBAT film. When the double-pull poly (adipic acid) -butylene terephthalate film is applied to the field of winding films, the viscosity of the biodegradable winding film can reach 2.3N, the tensile strength can reach 100MPa, the puncture resistance strength is more than 0.1KN/mm, the film is not easy to break in the packaging process, the use requirement of the winding film is met, and the use amount of the winding film is reduced. In addition, the transmittance of the double-pull PBAT winding film is more than 85%, and the requirements of beautiful appearance, no influence on sight and package viewing in the use process of the winding film are met.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
In order to solve the problems of low viscosity, difficulty in tight winding, high preparation cost and low mechanical property of the existing double-pull PBAT film when being applied to a winding film, the invention provides the double-pull poly (adipic acid) -butylene terephthalate biodegradable winding film, which is prepared by adding bio-based polycarbonate into the raw materials of the inner layer and the outer layer of the double-pull PBAT winding film so as to enhance the viscosity of the winding film and has good environmental friendliness; the prepared PBAT winding film has good mechanical property and optical property by combining with a biaxial stretching process.
Specifically, the invention provides a biodegradable winding film of double-pull poly (adipic acid) -butylene terephthalate, which comprises the following components: an inner layer, a core layer and an outer layer which are sequentially arranged;
The inner layer and the outer layer respectively comprise 50-94.5% of poly (butylene adipate-terephthalate), 5-49.7% of bio-based polycarbonate, 0.1-2% of antioxidant, 0.1-0.5% of slipping agent, 0.1-2% of compatilizer and 100% in total by mass percent;
The core layer is an intermediate layer and comprises 96-99.8% of poly (butylene adipate-terephthalate), 0.1-2% of chain extender, 0.1-2% of antioxidant and 100% of total weight percent; wherein the bio-based polycarbonate is selected from the group consisting of polypropylene carbonates.
In the embodiment of the invention, the bio-based polycarbonate is added into the raw materials of the inner layer and the outer layer in the process of synthesizing the wound film so as to enhance the viscosity of the wound film and have environmental friendliness, and the self-adhesiveness of the wound film can be adjusted according to the addition amount of the bio-based polycarbonate; the core layer is used as a supporting layer, PBAT with higher purity is used as a main raw material of the core layer, the price is cheaper than other degradable materials, and the cost of winding the film can be reduced. Meanwhile, the PBAT winding film prepared by adopting the inner layer, the core layer and the outer layer raw materials and adopting the biaxial stretching process has higher mechanical property and optical property compared with the existing double-pull PBAT film.
According to the embodiment of the invention, the thickness ratio of the inner layer to the core layer to the outer layer is 1-2:6-8:1-2, the thickness of the inner layer and the outer layer is controlled, the viscosity is improved, and the preparation cost is reduced; the thickness of the wound film is 5-40 μm to ensure that no rupture occurs during biaxial stretching.
According to an embodiment of the present invention, the chain extender is at least one compound selected from polyurethanes, polyols (such as triol chain extender), azo and epoxy, wherein the polyurethane chain extender may be ADR4370, the polyol is selected from triols such as trimethylolpropane, the azo chain extender may be polytetramethylene ether glycol bis-para-aminobenzoate, and the epoxy chain extender may be ADR4368 or ADR4468. By adding a proper proportion of chain extender, the composite casting sheet after extrusion casting can realize high-rate biaxial stretching without rupture of membranes, and the flexibility of the winding membrane is enhanced.
According to an embodiment of the present invention, the antioxidant is selected from the group consisting of antioxidant 1010 or antioxidant 168, and the antioxidant is added in an appropriate ratio to extend the life and improve the stability of the wound film; the slipping agent is at least one selected from ethylene bisstearamide, erucamide and zinc stearate, and is added in a proper proportion to reduce the phenomenon of sticking to rollers in the preparation process; the compatilizer is at least one selected from glycidyl methacrylate and maleic anhydride, and the compatilizer is added in a proper proportion to make the PBAT compatible with the bio-based polycarbonate, thereby being beneficial to improving the viscosity, mechanical property and optical property of the PBAT winding film.
According to an embodiment of the present invention, it is preferable that the polybutylene adipate-terephthalate is 50 to 80% and the bio-based polycarbonate is 18.9 to 49.7% in mass percent in the inner layer and the outer layer. The addition amount of the bio-based polycarbonate is controlled, so that the viscosity is improved, and meanwhile, the preparation cost is reduced.
According to the embodiment of the invention, the viscosity of the winding film can be improved to 1.3-2.3N by adding the bio-based polycarbonate, so that the requirement on viscosity in the use process of the winding film is met; through the biaxial stretching process, the puncture resistance of the winding film is more than 0.1KN/mm, so that the winding film is not easy to break in the packaging process.
According to an embodiment of the invention, a PBAT wound film is obtained by: respectively adding the raw materials of the inner layer, the core layer and the outer layer into different extruders for extrusion casting, and cooling to obtain a composite casting sheet; and (3) longitudinally stretching the composite casting sheet, transversely stretching, and performing heat setting to obtain the winding film. The tensile strength of the winding film in two directions is improved through biaxial stretching, the use requirement of the winding film is met, and the use amount can be effectively reduced due to the higher tensile strength, so that the cost is reduced.
According to the embodiment of the invention, the extrusion temperature of the inner layer, the core layer and the outer layer is 160-180 ℃, and the cooling temperature is 5-10 ℃; the stretching ratio of longitudinal stretching is 3-6 times, and the longitudinal stretching temperature is 80-100 ℃; the stretching ratio of transverse stretching is 7-9 times, and the transverse stretching temperature is 90-120 ℃; the temperature of the heat stabilization type is 110-140 ℃. The extrusion temperature of each layer is controlled to better compound the layers together; the transverse tensile strength and the longitudinal tensile strength of the winding film are improved by controlling the transverse and longitudinal stretching ratio and the stretching temperature; through high temperature setting, the heat stability of the winding film is improved, so that the winding film is not easy to break in the use process.
According to the embodiment of the invention, the light transmittance of the winding film is more than 85% by controlling the addition amount of the bio-based polycarbonate, so that the aesthetic requirement of the winding film in the use process is met.
According to the embodiment of the invention, through a biaxial stretching process, the longitudinal stretching (Machine Direction, MD) strength of the winding film is more than 60MPa, the transverse stretching (TRANSVERSE DIRECTION, TD) strength is more than 100MPa, the use requirement of the winding film is met in terms of mechanical properties, and the use amount can be effectively reduced due to higher stretching strength; and also has a high orientation and good rebound resilience when used as a wound film.
The invention is further illustrated by the following examples and related test experiments. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, the details of the various embodiments below may be arbitrarily combined into other viable embodiments without conflict. All of the instruments, consumables, reagents, etc. in the examples below are commercially available unless otherwise specified.
Example 1
This example 1 produced a biaxially oriented poly (butylene adipate-terephthalate) biodegradable wrap film comprising, in order from the inside out, an inner layer, a core layer and an outer layer;
The inner layer and the outer layer comprise the following components in percentage by mass: 80% of polybutylene adipate-terephthalate, 18.9% of bio-based polycarbonate, 0.3% of antioxidant, 0.3% of slipping agent and 0.5% of compatilizer;
The sandwich layer is an intermediate layer, comprising: 99.6% of poly (butylene adipate-terephthalate), 0.1% of chain extender and 0.3% of antioxidant;
Wherein the inner layer, the core layer and the outer layer adopt polybutylene adipate terephthalate (PBAT) as a blue mountain Tun river TH801T, the weight average molecular weight is 120000-150000g/mol, the melt flow rate at 2.16kg and 190 ℃ is 3.9g/10min, and the melting point is 119 ℃. The bio-based polycarbonate is polypropylene carbonate, the antioxidant is antioxidant 1010, the slipping agent is erucamide, the compatilizer is maleic anhydride, and the chain extender is ADR4368.
The thickness of the double drawn PBAT winding film in example 1 was 8. Mu.m, in which the thickness ratio of the inner layer, the core layer and the outer layer was 1:8:1.
The wound film of example 1 was prepared as follows:
(1) Adding the raw materials of the inner layer into a double-screw extruder A for extrusion casting at 170 ℃, adding the raw materials of the core layer into a double-screw extruder B for extrusion casting at 170 ℃, adding the raw materials of the outer layer into a double-screw extruder C for extrusion casting at 170 ℃, and cooling at 10 ℃ to obtain a composite casting sheet;
(2) And (3) longitudinally stretching the composite casting sheet obtained in the step (1), transversely stretching, and performing heat setting to obtain the double-pull PBAT winding film. Wherein the stretching ratio of longitudinal stretching is 5 times, and the longitudinal stretching temperature is 90 ℃; the stretching ratio of the transverse stretching is 8 times, and the transverse stretching temperature is 100 ℃; the heat setting temperature is 120 ℃.
Example 2
The procedure for preparing the double-drawn PBAT wound film of this example 2 was the same as that of the double-drawn PBAT wound film of example 1, with the main differences that: the inner layer and the outer layer comprise: 50% of polybutylene adipate-terephthalate, 49.7% of bio-based polycarbonate, 0.1% of antioxidant, 0.1% of slipping agent and 0.1% of compatilizer;
The sandwich layer is an intermediate layer, comprising: 99.6% of poly (butylene adipate-terephthalate), 0.1% of chain extender and 0.3% of antioxidant;
wherein the inner layer, the core layer and the outer layer adopt polybutylene adipate-terephthalate (PBAT) as a blue mountain Tun river TH801T, the weight average molecular weight is 120000-150000g/mol, the melt flow rate under 2.16kg and 190.C is 3.9g/10min, and the melting point is 119 ℃. The bio-based polycarbonate is polypropylene carbonate, the antioxidant is antioxidant 1010, the slipping agent is erucamide, the compatilizer is maleic anhydride, and the chain extender is ADR4368.
The thickness of the double drawn PBAT winding film in example 2 was 8. Mu.m, in which the thickness ratio of the inner layer, the core layer and the outer layer was 1:8:1.
Example 3
The procedure of the double-drawn PBAT wound film prepared in this example 3 was the same as that of the double-drawn PBAT wound film prepared in example 1, except that: the inner layer and the outer layer comprise: 94.5% of polybutylene adipate-terephthalate, 5% of bio-based polycarbonate, 0.1% of antioxidant, 0.3% of slipping agent and 0.1% of compatilizer;
The sandwich layer is an intermediate layer, comprising: 99.6% of poly (butylene adipate-terephthalate), 0.1% of chain extender and 0.3% of antioxidant;
Wherein the inner layer, the core layer and the outer layer adopt polybutylene adipate terephthalate (PBAT) as a blue mountain Tun river TH801T, the weight average molecular weight is 120000-150000g/mol, the melt flow rate at 2.16kg and 190 ℃ is 3.9g/10min, and the melting point is 119 ℃. The bio-based polycarbonate is polypropylene carbonate, the antioxidant is antioxidant 1010, the slipping agent is erucamide, the compatilizer is maleic anhydride, and the chain extender is ADR4368.
The thickness of the double drawn PBAT winding film in example 3 was 8. Mu.m, in which the thickness ratio of the inner layer, the core layer and the outer layer was 1:8:1.
Comparative example 1
The biaxially oriented PBAT winding film is prepared in the comparative example 1, and comprises a heat sealing layer, a core layer and a corona layer from inside to outside in sequence;
the heat seal layer includes: 98% of polybutylene adipate-terephthalate A and 2% of antioxidant 1010;
the core layer comprises: 97.2% of polybutylene adipate-terephthalate B, 0.8% of Pasteur ADR4468 chain extender and 2% of antioxidant 1010;
the corona layer includes: 90% of polybutylene adipate-terephthalate B, 5% of corn starch, 1% of di-tert-butylperoxyisopropyl benzene, 2% of sorbitol and 2% of ethylene bis-stearamide;
Wherein, the polybutylene adipate-terephthalate A is blue mountain Tun river TH803S, the weight average molecular weight is 70000-120000g/mol, the melt flow rate at 2.16kg and 190 ℃ is 10-16g/10min, and the melting point is 113 ℃; the polybutylene adipate-terephthalate B is blue mountain river TH801T, the weight average molecular weight is 120000-150000g/mol, the melt flow rate at 2.16kg and 190 ℃ is 3.9g/10min, and the melting point is 119 ℃.
The biaxially oriented PBAT wound film in comparative example 1 had a thickness of 25 μm, wherein the thickness ratio of the heat seal layer, core layer and corona layer was 1.5:6.5:2.
The biaxially oriented PBAT wound film of comparative example 1 was prepared as follows:
(1) Adding the raw materials of the heat sealing layer into a single screw extruder, extruding and casting at 140 ℃, adding the raw materials of the core layer into a double screw extruder, extruding and casting at 160 ℃, adding the raw materials of the corona layer into another double screw extruder, extruding and casting at 150 ℃, and cooling at 30 ℃ to obtain a composite casting sheet;
(2) And (3) longitudinally stretching the composite casting sheet obtained in the step (1), transversely stretching, and performing heat setting to obtain the biaxially oriented PBAT winding film. Wherein the stretching ratio of longitudinal stretching is 3 times, and the longitudinal stretching temperature is 110 ℃; the stretching ratio of transverse stretching is 8 times, and the transverse stretching temperature is 115 ℃; the heat setting temperature was 122 ℃.
Comparative example 2
This comparative example 2 is a common PBAT cast film on the market.
Performance test:
The wound films of examples 1-3 and comparative examples 1-2 were subjected to performance tests, in which tensile strength test was referred to GB/T1040.3, haze and light transmittance test was referred to GB/T2410, and viscosity test was referred to BB/T0024-2018. The specific test results are shown in Table 1.
TABLE 1 results of Performance test of different wound films
As can be seen from Table 1, the addition of bio-based polycarbonate can effectively increase the viscosity of the wound film to 1.3-2.3N; the bio-based polycarbonate is cooperatively used through biaxial stretching, the longitudinal tensile strength of the prepared PBAT winding film is more than 60MPa, the transverse tensile strength is more than 100MPa, the winding film is not easy to break in the packaging process, and the use requirement of the winding film is met; and the tensile strength is higher, so that the use amount can be effectively reduced, and the effects of reducing the cost and protecting the environment can be achieved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.
Claims (10)
1. A biara poly (butylene adipate-terephthalate) biodegradable wrap film comprising: an inner layer, a core layer and an outer layer which are sequentially arranged;
the inner layer and the outer layer respectively comprise 50-94.5% of poly (butylene adipate-terephthalate), 5-49.7% of bio-based polycarbonate, 0.1-2% of antioxidant, 0.1-0.5% of slipping agent, 0.1-2% of compatilizer and 100% in total by mass percent;
The core layer is an intermediate layer and comprises 96-99.8% of poly (butylene adipate-terephthalate), 0.1-2% of chain extender, 0.1-2% of antioxidant and 100% of total weight;
wherein the bio-based polycarbonate is selected from the group consisting of polypropylene carbonates.
2. The wound film of claim 1, wherein:
The chain extender is at least one compound selected from polyurethane, polyalcohol, azo and epoxy.
3. The wound film of claim 1, wherein:
The thickness ratio of the inner layer to the core layer to the outer layer is 1-2:6-8:1-2;
The thickness of the winding film is 5-40 mu m.
4. The wound film of claim 1, wherein:
the antioxidant is selected from antioxidant 1010 or antioxidant 168;
the slipping agent is at least one selected from ethylene bisstearamide, erucamide and zinc stearate;
The compatilizer is at least one selected from glycidyl methacrylate and maleic anhydride.
5. The wound film of claim 2, wherein:
In the inner layer and the outer layer, the polybutylene adipate-terephthalate is 50-80% and the biobased polycarbonate is 18.9-49.7% by mass.
6. The wound film of claim 1 or 5, wherein:
the viscosity of the winding film is 1.3-2.3N, and the puncture resistance strength of the winding film is more than 0.1KN/mm.
7. The wound film according to claim 1, wherein the wound film is obtained by:
Respectively adding the raw materials of the inner layer, the core layer and the outer layer into different extruders for extrusion casting, and cooling to obtain a composite casting;
and (3) longitudinally stretching the composite casting sheet, transversely stretching, and performing heat setting to obtain the winding film.
8. The wound film of claim 7, wherein:
The extrusion temperature of the inner layer, the core layer and the outer layer is 160-180 ℃, and the cooling temperature is 5-10 ℃;
The stretching ratio of the longitudinal stretching is 3-6 times, and the longitudinal stretching temperature is 80-100 ℃;
the stretching ratio of the transverse stretching is 7-9 times, and the transverse stretching temperature is 90-120 ℃;
The temperature of the heat stabilization type is 110-140 ℃.
9. The wound film according to claim 1 or 8, wherein:
The light transmittance of the wound film is greater than 85%.
10. The wound film according to claim 1 or 8, wherein:
the longitudinal tensile strength of the winding film is more than 60MPa, and the transverse tensile strength is more than 100MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410382322.0A CN118024700A (en) | 2024-03-29 | 2024-03-29 | Double-pull poly adipic acid-butylene terephthalate biodegradable winding film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410382322.0A CN118024700A (en) | 2024-03-29 | 2024-03-29 | Double-pull poly adipic acid-butylene terephthalate biodegradable winding film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118024700A true CN118024700A (en) | 2024-05-14 |
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ID=90995418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410382322.0A Pending CN118024700A (en) | 2024-03-29 | 2024-03-29 | Double-pull poly adipic acid-butylene terephthalate biodegradable winding film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118024700A (en) |
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2024
- 2024-03-29 CN CN202410382322.0A patent/CN118024700A/en active Pending
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