CN117183516A - Multilayer co-extrusion heat-shrinkable film with high fluidity and preparation method thereof - Google Patents
Multilayer co-extrusion heat-shrinkable film with high fluidity and preparation method thereof Download PDFInfo
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- 238000001125 extrusion Methods 0.000 title claims abstract description 28
- 229920006257 Heat-shrinkable film Polymers 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000010410 layer Substances 0.000 claims abstract description 47
- 238000001816 cooling Methods 0.000 claims abstract description 38
- 238000003475 lamination Methods 0.000 claims abstract description 21
- 238000007493 shaping process Methods 0.000 claims abstract description 17
- 238000004513 sizing Methods 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000012792 core layer Substances 0.000 claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000005187 foaming Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 238000009966 trimming Methods 0.000 claims abstract description 7
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 59
- -1 polypropylene Polymers 0.000 claims description 31
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 claims description 29
- 239000004743 Polypropylene Substances 0.000 claims description 28
- 229920001155 polypropylene Polymers 0.000 claims description 28
- 229920006300 shrink film Polymers 0.000 claims description 13
- 239000002216 antistatic agent Substances 0.000 claims description 10
- 229920001577 copolymer Polymers 0.000 claims description 10
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 9
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 9
- 229940037312 stearamide Drugs 0.000 claims description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 9
- 229920002554 vinyl polymer Polymers 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 235000021355 Stearic acid Nutrition 0.000 claims description 7
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 7
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000008117 stearic acid Substances 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000002826 coolant Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 229920013716 polyethylene resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 3
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 3
- 229920001684 low density polyethylene Polymers 0.000 claims description 3
- 239000004702 low-density polyethylene Substances 0.000 claims description 3
- 229920001179 medium density polyethylene Polymers 0.000 claims description 3
- 239000004701 medium-density polyethylene Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 229920006027 ternary co-polymer Polymers 0.000 claims description 2
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000000137 annealing Methods 0.000 description 8
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 7
- 229920001897 terpolymer Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 2
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BLDFSDCBQJUWFG-UHFFFAOYSA-N 2-(methylamino)-1,2-diphenylethanol Chemical compound C=1C=CC=CC=1C(NC)C(O)C1=CC=CC=C1 BLDFSDCBQJUWFG-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The application provides a multilayer coextrusion thermal shrinkage film with high fluidity and a preparation method thereof, wherein the multilayer coextrusion thermal shrinkage film with excellent fluidity comprises an outer layer, a core layer and an inner layer which are sequentially laminated, and the preparation method comprises the following steps: mixing the raw materials of all layers in proportion, respectively melting and plasticizing, then carrying out multi-layer co-extrusion lamination to obtain a co-extrusion lamination melt, inflating the co-extrusion lamination melt to obtain a film bubble, and cooling and shaping to obtain a primary inflation film tube; the primary inflation film tube is heated after being dehydrated, then is inflated through foaming and is inflated instantly and transversely inflated, and is simultaneously longitudinally stretched to a required size by machinery, and is sized and cooled through a sizing air ring; finally, performing heat treatment, cooling, flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with high fluidity; the multilayer co-extrusion heat shrinkage film with high fluidity has good flow property under the conditions of low temperature and high temperature.
Description
Technical Field
The application relates to the field of heat-shrinkable films, in particular to a multilayer co-extrusion heat-shrinkable film with high fluidity and a preparation method thereof.
Background
The heat-shrinkable film is used for selling and transporting various products and has the main functions of stabilizing, covering and protecting the products; shrink films must have high puncture resistance, good shrink properties and a certain shrink stress. During shrinkage, the film cannot create holes. Since shrink films are often suitable for use outdoors, the addition of UV anti-UV agents is required.
Heat-shrinkable films are widely used: the packaging technology can not only meet the functions of moisture resistance, dust prevention, touch and theft prevention, transparent display and the like of goods, but also increase the attractive appearance of the products, can also be used for replacing various paper boxes, saves packaging cost, and accords with packaging trend, and the shrink film (bag) can be manufactured by processing: shaped bags such as flat bags, circular arc bags, trapezoid bags, three-dimensional bags and the like.
However, the slipping agent used in conventional POF is mainly a primary amide compound such as erucamide and oleamide. Such materials tend to precipitate from the film, but the precipitation process is not controllable and is prone to tackiness at high temperatures (. Gtoreq.30 ℃). When the packaging machine is applied to automatic packaging, the fluidity of the packaging machine cannot be effectively ensured.
Disclosure of Invention
The first aim of the application is to provide a multilayer co-extrusion heat-shrinkable film with high fluidity and a preparation method thereof, wherein the multilayer co-extrusion heat-shrinkable film has good fluidity.
In order to achieve the above object of the present application, the following technical solutions are specifically adopted:
the utility model provides a multilayer coextrusion heat shrink film that mobility is high, includes outer, sandwich layer and inlayer that stacks gradually, outer and inlayer, its raw materials all include by mass percent: 70-95% of polypropylene resin, 1-5% of silicone anti-blocking master batch, 1-5% of slipping agent master batch and 1-5% of surfactant antistatic agent master batch; the core layer comprises the following raw materials in percentage by mass: 80-95% of polyethylene resin and 5-20% of oil-based palmitamide slipping master batch;
the slipping agent master batch is at least one of vinyl bis-stearamide slipping master batch, stearic acid erucamide slipping master batch and oil-based palmitamide slipping master batch;
the polypropylene resin is at least one of ternary copolymer polypropylene, binary copolymer polypropylene, homopolymerized polypropylene, maleic anhydride modified polypropylene, acrylic acid modified polypropylene and propylene-octene copolymer;
the polyethylene resin is at least one of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-low-density polyethylene, ethylene-octene copolymer and acrylic acid grafted modified polyethylene.
Preferably, the melt index of the polypropylene resin in both the outer layer and the inner layer is 0.1-5g/10min under a pressure of 2.16kg at 230 ℃.
Preferably, the polyethylene resin in the core layer has a melt index of 0.5-3g/10min at 190 ℃ under a pressure of 2.16 kg.
Preferably, the slipping agent master batch comprises one or more of vinyl bis-stearamide slipping master batch, stearic acid erucamide slipping master batch and oil-based palmitoamide slipping master batch.
Preferably, the thickness is 10-30 μm.
The preparation method of the multilayer coextrusion thermal shrinkage film with high fluidity comprises the following steps:
A. mixing the raw materials of all layers in proportion, respectively melting and plasticizing, then carrying out multi-layer co-extrusion lamination to obtain a co-extrusion lamination melt, inflating the co-extrusion lamination melt to obtain a film bubble, and cooling and shaping to obtain a primary inflation film tube;
B. the primary inflation film tube is heated after being dehydrated, then is inflated through foaming and is inflated instantly and transversely inflated, and is simultaneously longitudinally stretched to a required size by machinery, and is sized and cooled through a sizing air ring;
C. finally, carrying out heat treatment, cooling, flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with excellent fluidity and high fluidity.
Preferably, in the step A, the temperature range of the multi-layer parallel conical die used for the multi-layer coextrusion layer is 190-220 ℃, and the die lip clearance is 1.0-2.5mm; the diameter of the membrane bubble is 400-560mm; the temperature of the cooling water used for cooling and shaping is 10-17 ℃.
Preferably, the temperature of the once-blown film tube after being heated is 85-110 ℃; in the transverse and longitudinal synchronous stretching, the times of the transverse stretching and the longitudinal stretching are both 4-7 times.
Preferably, the sizing cooling is performed by adopting 5-level cooling air rings, the air quantity of the 1 st-level air ring is 1000-2500m < 3 >/h, the air quantity of the 2 nd-level air ring is 1000-2500m < 3 >/h, the air quantity of the 3 rd-level air ring is 1000-2000m < 3 >/h, and the air quantity of the 4 th-level air ring and the 5 th-level air ring is 500-1000m < 3 >/h.
Optionally, in the step C, the temperature of the heat treatment is 60-80 ℃, and the temperature of the cooling medium used for cooling is 10-30 ℃.
Compared with the prior art, the application has the beneficial effects that:
the multilayer co-extrusion heat-shrinkable film with high fluidity provided by the application has the advantages of quick flow performance effect, better durability of flow performance, and good flow performance under low-temperature (-10 ℃ to 0 ℃) and high-temperature (30 ℃ to 40 ℃) conditions; the packaging machine can be used for directly boxing after high-speed slitting or packaging, so that the production efficiency is improved, and the production cost is reduced.
The preparation method of the multilayer co-extrusion heat-shrinkable film with high fluidity has stable process.
Drawings
FIG. 1 is a schematic flow chart of the method of the present application.
FIG. 2 is a graph comparing test results of various examples.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The utility model provides a multilayer coextrusion heat shrink film that mobility is high, includes inlayer, inlayer that the range upon range of setting, wherein, each layer raw materials is:
an outer layer:
65wt% of a terpolymer Polypropylene (2.16 kg pressure, melt index at 230 ℃ C. 0.5g/10 min)
20wt% acrylic modified Polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 1.5g/10 min)
5wt% silicone anti-blocking masterbatch
5wt% vinyl bis stearamide smooth master batch
5wt% of a surfactant-type antistatic agent masterbatch;
core layer:
75wt% LDPE (2.16 kg pressure, 190 ℃ C. Melt index 1.5g/10 min)
15wt% mLDPE (2.16 kg pressure, 190 ℃ C. Melt index 1.5g/10 min)
10wt% of oil-based palmitamide slip master batch;
an inner layer:
65wt% of a terpolymer Polypropylene (2.16 kg pressure, melt index at 230 ℃ C. 0.5g/10 min)
20wt% acrylic modified Polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 1.5g/10 min)
5wt% silicone anti-blocking masterbatch
5wt% vinyl bis stearamide smooth master batch
5wt% of a surfactant type antistatic agent masterbatch.
The preparation process comprises the following steps:
after mixing the raw materials of all layers in proportion, respectively using a single screw extruder to carry out melting plasticization, wherein the temperature of the screw extruder is set as follows: the feeding section is 160-180 ℃, the melting section is 160-190 ℃, and the homogenizing section is 190-220 ℃; and then carrying out multilayer coextrusion lamination by using a multilayer parallel conical die head to obtain a coextrusion lamination melt, wherein the temperature range of the multilayer parallel conical die head is 220 ℃, the die lip clearance is 1.0mm, the coextrusion lamination melt is inflated to obtain a bubble with the diameter of 400mm, and then cooling and shaping by using a shaping water jacket to obtain a one-time inflation film tube with a multilayer structure, wherein the temperature of cooling water in the shaping water jacket is 10 ℃.
Heating the primary inflation film tube to 100 ℃ through a far infrared ceramic oven after water removal, then performing instantaneous transverse inflation through foaming and inflation, simultaneously performing longitudinal stretching to a required size through mechanical stretching, performing sizing cooling through a sizing air ring, wherein the multiple of the transverse stretching is 4 times, and the multiple of the longitudinal stretching is 7 times; the sizing cooling is carried out by adopting 5-level cooling air rings, the air quantity of the 1 st-level air ring is 2500m 3/h, the air quantity of the 2 nd-level air ring is 2500m 3/h, the air quantity of the 3 rd-level air ring is 2000m 3/h, and the air quantity of the 4 th-level air ring and the 5 th-level air ring is 1000m 3/h.
Finally, annealing and cooling, wherein the annealing temperature is 80 ℃, and the cooling temperature of a cooling medium is 10 ℃; flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with the thickness of 15 mu m and excellent flowability and high flowability.
Example 2
The utility model provides a multilayer coextrusion heat shrink film that mobility is high, includes inlayer, inlayer that the range upon range of setting, wherein, each layer raw materials is:
an outer layer:
52wt% binary copolymer polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 1g/10 min)
40wt% homo-polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 2g/10 min)
4wt% silicone anti-blocking masterbatch
1.5wt% stearic acid erucamide smooth master batch
1.5wt% oil-based palmitamide slip master batch
1wt% of a surfactant-type antistatic agent masterbatch;
core layer:
69wt% LLDPE (2.16 kg pressure, 190 ℃ C. Melt index 2g/10 min)
25wt% mLDPE (2.16 kg pressure, 190 ℃ C. Melt index 2g/10 min)
6wt% of oil-based palmitamide slip master batch;
an inner layer:
52wt% binary copolymer polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 1g/10 min)
40wt% homo-polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 2g/10 min)
4wt% silicone anti-blocking masterbatch
1.5wt% stearic acid erucamide smooth master batch
1.5wt% oil-based palmitamide slip master batch
1wt% of a surfactant-type antistatic agent masterbatch.
The preparation process comprises the following steps:
after mixing the raw materials of all layers in proportion, respectively using a single screw extruder to carry out melting plasticization, wherein the temperature of the screw extruder is set as follows: the feeding section is 160-180 ℃, the melting section is 160-190 ℃, and the homogenizing section is 190-220 ℃; and then carrying out multilayer coextrusion lamination by using a multilayer parallel conical die head to obtain a coextrusion lamination melt, wherein the temperature range of the multilayer parallel conical die head is 190 ℃, the die lip clearance is 2.5mm, the coextrusion lamination melt is inflated to obtain a bubble with the diameter of 560mm, and then cooling and shaping by using a shaping water jacket to obtain a one-time inflation film tube with a multilayer structure, and the temperature of cooling water in the shaping water jacket is 17 ℃.
Heating the primary inflation film tube to 110 ℃ through a far infrared ceramic oven after water removal, then performing instantaneous transverse inflation through foaming and inflation, simultaneously performing longitudinal stretching to a required size through mechanical stretching, and performing sizing cooling through a sizing air ring, wherein the transverse stretching multiple is 7 times and the longitudinal stretching multiple is 4 times; sizing cooling is carried out by adopting 5-level cooling air rings, the air quantity of the 1 st-level air ring is 1000m 3/h, the air quantity of the 2 nd-level air ring is 1000m 3/h, the air quantity of the 3 rd-level air ring is 1000m 3/h, and the air quantity of the 4 th-level air ring and the 5 th-level air ring is 500m 3/h.
Finally, annealing and cooling, wherein the annealing temperature is 60 ℃, and the cooling temperature of a cooling medium is 30 ℃; flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with the thickness of 15 mu m and high fluidity.
Example 3
The utility model provides a multilayer coextrusion heat shrink film that mobility is high, includes inlayer, inlayer that the range upon range of setting, wherein, each layer raw materials is:
an outer layer:
50wt% of a terpolymer polypropylene (2.16 kg pressure, melt index at 230 ℃ C. 3g/10 min)
36.5% by weight of propylene-octene copolymer (2.16 kg pressure, melt index at 230 ℃ C. 3g/10 min)
5wt% silicone anti-blocking masterbatch
1.5wt% vinyl bis-stearamide slip master batch
2wt% stearic acid erucamide smooth master batch
2wt% oil-based palmitamide smooth master batch
3wt% of a surfactant-type antistatic agent masterbatch;
core layer:
65wt% MDPE (2.16 kg pressure, 190 ℃ C. Melt index 1g/10 min)
25wt% mLDPE (2.16 kg pressure, 190 ℃ C. Melt index 1g/10 min)
10wt% of oil-based palmitamide slip master batch;
an inner layer:
50wt% of a terpolymer polypropylene (2.16 kg pressure, melt index at 230 ℃ C. 3g/10 min)
36.5% by weight of propylene-octene copolymer (2.16 kg pressure, melt index at 230 ℃ C. 3g/10 min)
5wt% silicone anti-blocking masterbatch
1.5wt% vinyl bis-stearamide slip master batch
2wt% stearic acid erucamide smooth master batch
2wt% oil-based palmitamide smooth master batch
3wt% of surfactant type antistatic agent master batch.
The preparation process comprises the following steps:
after mixing the raw materials of all layers in proportion, respectively using a single screw extruder to carry out melting plasticization, wherein the temperature of the screw extruder is set as follows: the feeding section is 160-180 ℃, the melting section is 160-190 ℃, and the homogenizing section is 190-220 ℃; and then carrying out multilayer coextrusion lamination by using a multilayer parallel conical die head to obtain a coextrusion lamination melt, wherein the temperature range of the multilayer parallel conical die head is 210 ℃, the die lip clearance is 2mm, the coextrusion lamination melt is inflated to obtain a film bubble with the diameter of 510mm, and then cooling and shaping by using a shaping water jacket to obtain a primary inflation film tube with a multilayer structure, and the temperature of cooling water in the shaping water jacket is 13 ℃.
Heating the primary inflation film tube to 85 ℃ through a far infrared ceramic oven after water removal, then performing instantaneous transverse inflation through foaming and inflation, simultaneously performing longitudinal stretching to a required size through mechanical stretching, performing sizing cooling through a sizing air ring, wherein the multiple of the transverse stretching is 5.5 times, and the multiple of the longitudinal stretching is 5.5 times; the sizing cooling is carried out by adopting 5-level cooling air rings, the air quantity of the 1 st-level air ring is 2000m 3/h, the air quantity of the 2 nd-level air ring is 2000m 3/h, the air quantity of the 3 rd-level air ring is 1500m 3/h, and the air quantity of the 4 th-level air ring and the 5 th-level air ring is 700m 3/h.
Finally, annealing and cooling, wherein the annealing temperature is 65 ℃, and the cooling temperature of a cooling medium is 15 ℃; flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with the thickness of 30 mu m and high fluidity.
Example 4
The utility model provides a multilayer coextrusion heat shrink film that mobility is high, includes inlayer, inlayer that the range upon range of setting, wherein, each layer raw materials is:
an outer layer:
56wt% of a terpolymer Polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 0.8g/10 min)
35wt% Maleinhydride modified Polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 1.2g/10 min)
5wt% silicone anti-blocking masterbatch
1wt% vinyl bis stearamide smooth master batch
1wt% oil-based palmitamide smooth master batch
2wt% of a surfactant-type antistatic agent masterbatch;
core layer:
75wt% HDPE (2.16 kg pressure, 190 ℃ C. Melt index 1.3g/10 min)
20wt% mLDPE (2.16 kg pressure, 190 ℃ C. Melt index 1.2g/10 min)
5wt% of oil-based palmitamide slip master batch;
an inner layer:
56wt% of a terpolymer Polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 0.8g/10 min)
35wt% Maleinhydride modified Polypropylene (2.16 kg pressure, 230 ℃ C. Melt index 1.2g/10 min)
5wt% silicone anti-blocking masterbatch
1wt% vinyl bis stearamide smooth master batch
1wt% oil-based palmitamide smooth master batch
2wt% of a surfactant type antistatic agent masterbatch.
The preparation process comprises the following steps:
after mixing the raw materials of all layers in proportion, respectively using a single screw extruder to carry out melting plasticization, wherein the temperature of the screw extruder is set as follows: the feeding section is 160-180 ℃, the melting section is 160-190 ℃, and the homogenizing section is 190-220 ℃; and then carrying out multilayer coextrusion lamination by using a multilayer parallel conical die head to obtain a coextrusion lamination melt, wherein the temperature range of the multilayer parallel conical die head is 195 ℃, the die lip clearance is 1.5mm, the coextrusion lamination melt is inflated to obtain a bubble with the diameter of 550mm, and then cooling and shaping by using a shaping water jacket to obtain a one-time inflation film tube with a multilayer structure, and the temperature of cooling water in the shaping water jacket is 16 ℃.
Heating the primary inflation film tube to 95 ℃ through a far infrared ceramic oven after water removal, then performing instantaneous transverse inflation through foaming and inflation, simultaneously performing longitudinal stretching to a required size through mechanical stretching, performing sizing cooling through a sizing air ring, wherein the multiple of the transverse stretching is 7 times, and the multiple of the longitudinal stretching is 7 times; sizing cooling is carried out by adopting 5-level cooling air rings, the air quantity of the 1 st-level air ring is 2200m 3/h, the air quantity of the 2 nd-level air ring is 2000m 3/h, the air quantity of the 3 rd-level air ring is 1800m 3/h, and the air quantity of the 4 th-level air ring and the 5 th-level air ring is 700m 3/h.
Finally, annealing and cooling, wherein the annealing temperature is 75 ℃, and the cooling temperature of a cooling medium is 25 ℃; flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with the thickness of 10 mu m and high fluidity.
In order to further illustrate the effect of the high-flowability multilayer co-extrusion heat-shrinkable film provided by the application, the following control experiment was performed:
comparative example 1
The difference compared to example 1 is that oleamide is used as the slip master for the outer layer.
Comparative example 2
The difference compared to example 2 is that the inner layer uses erucamide as a slip master batch.
Comparative example 3
The difference compared to example 3 is that the core layer does not contain oil-based palmitamide slip master batch.
Comparative example 4
The difference compared to example 4 is that the outer layer, the core layer and the inner layer do not contain smooth master batches.
The high flowability multilayer coextruded heat shrink films obtained in examples 1-4 and comparative examples 1-4 were tested for coefficient of friction and the results are shown in table 1 below:
table 1 test results
From the data in the table above, the type of the outer layer and the inner layer of the slip master batch has a larger influence on the flow property of the film, and the type of the core layer of the slip master batch has a smaller influence. By preference for the type and amount of the slip master batch, excellent flow properties can be obtained.
The multilayer co-extrusion heat-shrinkable film with high fluidity provided by the application has good fluidity under low temperature and high temperature conditions.
While particular embodiments of the present application have been illustrated and described, it will be appreciated that various other changes and modifications can be made without departing from the spirit and scope of the application. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this application.
The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims of this application, which are within the skill of those skilled in the art, can be made without departing from the spirit and scope of the application disclosed herein.
Claims (9)
1. The multilayer co-extrusion heat-shrinkable film with high fluidity of flow performance is characterized by comprising an outer layer, a core layer and an inner layer which are sequentially laminated, wherein the outer layer and the inner layer comprise the following raw materials in percentage by mass:
70-95% of polypropylene resin, 1-5% of silicone anti-blocking master batch, 1-5% of slipping agent master batch and 1-5% of surfactant antistatic agent master batch;
the core layer comprises the following raw materials in percentage by mass: 80-95% of polyethylene resin and 5-20% of oil-based palmitamide slipping master batch;
the slipping agent master batches in the outer layer and the inner layer comprise vinyl bis-stearamide slipping master batches, stearic acid erucamide slipping master batches and oil-based palmitoamide slipping master batches;
the slipping agent master batch in the core layer is an oil-based palmitoyl amide slipping master batch;
the polypropylene resin is at least one of ternary copolymer polypropylene, binary copolymer polypropylene, homopolymerized polypropylene, maleic anhydride modified polypropylene, acrylic acid modified polypropylene and propylene-octene copolymer;
the polyethylene resin is at least one of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-low-density polyethylene, ethylene-octene copolymer and acrylic acid grafted modified polyethylene.
2. The high flow multilayer coextruded heat shrink film of claim 1 wherein: the melt index of the polypropylene resin in the outer layer and the inner layer is 0.1-5g/10min under the conditions of 2.16kg pressure and 230 ℃.
3. The high flow multilayer coextruded heat shrink film of claim 1 wherein: the melt index of the polyethylene resin in the core layer is 0.5-3g/10min under the conditions of 2.16kg pressure and 190 ℃.
4. A high flow multilayer coextruded heat shrink film according to any of claims 1-3 characterized in that: the thickness is 10-30 μm.
5. A process for producing the high-fluidity multilayer coextruded heat shrink film having high fluidity according to any one of claims 1 to 4, characterized by comprising the steps of:
A. mixing the raw materials of all layers in proportion, respectively melting and plasticizing, then carrying out multi-layer co-extrusion lamination to obtain a co-extrusion lamination melt, inflating the co-extrusion lamination melt to obtain a film bubble, and cooling and shaping to obtain a primary inflation film tube;
B. the primary inflation film tube is heated after being dehydrated, then is inflated through foaming and is inflated instantly and transversely inflated, and is simultaneously longitudinally stretched to a required size by machinery, and is sized and cooled through a sizing air ring;
C. finally, carrying out heat treatment, cooling, flattening, trimming and rolling to obtain the multilayer co-extrusion heat-shrinkable film with excellent fluidity and high fluidity.
6. The method of manufacturing according to claim 5, wherein: in the step A, the temperature range of a multi-layer parallel conical die head used for the multi-layer co-extrusion layer is 190-220 ℃, and the die lip clearance is 1.0-2.5mm; the diameter of the membrane bubble is 400-560mm; the temperature of the cooling water used for cooling and shaping is 10-17 ℃.
7. The method of manufacturing according to claim 5, wherein: the temperature of the once-blown film tube after being heated is 85-110 ℃; in the transverse and longitudinal synchronous stretching, the times of the transverse stretching and the longitudinal stretching are both 4-7 times.
8. The method of manufacturing according to claim 5, wherein: the sizing cooling is carried out by adopting 5-level cooling air rings, the air quantity of the 1 st-level air ring is 1000-2500 m/h, the air quantity of the 2 nd-level air ring is 1000-2500 m/h, the air quantity of the 3 rd-level air ring is 1000-2000 m/h, and the air quantity of the 4 th-level air ring and the 5 th-level air ring is 500-1000 m/h.
9. The method of any one of claims 5-8, wherein: in the step C, the temperature of the heat treatment is 60-80 ℃, and the temperature of the cooling medium used for cooling is 10-30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310914395.5A CN117183516A (en) | 2023-07-25 | 2023-07-25 | Multilayer co-extrusion heat-shrinkable film with high fluidity and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310914395.5A CN117183516A (en) | 2023-07-25 | 2023-07-25 | Multilayer co-extrusion heat-shrinkable film with high fluidity and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN117183516A true CN117183516A (en) | 2023-12-08 |
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|---|---|---|---|
| CN202310914395.5A Withdrawn CN117183516A (en) | 2023-07-25 | 2023-07-25 | Multilayer co-extrusion heat-shrinkable film with high fluidity and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117183516A (en) |
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2023
- 2023-07-25 CN CN202310914395.5A patent/CN117183516A/en not_active Withdrawn
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Application publication date: 20231208 |