CN115648764A - Composite membrane, preparation method of microwave heating exhaust bag and microwave heating exhaust bag - Google Patents
Composite membrane, preparation method of microwave heating exhaust bag and microwave heating exhaust bag Download PDFInfo
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- CN115648764A CN115648764A CN202211316114.8A CN202211316114A CN115648764A CN 115648764 A CN115648764 A CN 115648764A CN 202211316114 A CN202211316114 A CN 202211316114A CN 115648764 A CN115648764 A CN 115648764A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 45
- 239000012528 membrane Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- -1 polypropylene Polymers 0.000 claims abstract description 51
- 239000004743 Polypropylene Substances 0.000 claims abstract description 40
- 229920001155 polypropylene Polymers 0.000 claims abstract description 40
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 27
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 22
- 229920002545 silicone oil Polymers 0.000 claims abstract description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 34
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims description 17
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 17
- 239000004408 titanium dioxide Substances 0.000 claims description 17
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims description 12
- 239000012752 auxiliary agent Substances 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 239000012744 reinforcing agent Substances 0.000 claims description 10
- KSEBMYQBYZTDHS-HWKANZROSA-M (E)-Ferulic acid Natural products COC1=CC(\C=C\C([O-])=O)=CC=C1O KSEBMYQBYZTDHS-HWKANZROSA-M 0.000 claims description 8
- KSEBMYQBYZTDHS-HWKANZROSA-N ferulic acid Chemical compound COC1=CC(\C=C\C(O)=O)=CC=C1O KSEBMYQBYZTDHS-HWKANZROSA-N 0.000 claims description 8
- 229940114124 ferulic acid Drugs 0.000 claims description 8
- KSEBMYQBYZTDHS-UHFFFAOYSA-N ferulic acid Natural products COC1=CC(C=CC(O)=O)=CC=C1O KSEBMYQBYZTDHS-UHFFFAOYSA-N 0.000 claims description 8
- 235000001785 ferulic acid Nutrition 0.000 claims description 8
- 229920005552 sodium lignosulfonate Polymers 0.000 claims description 8
- QURCVMIEKCOAJU-UHFFFAOYSA-N trans-isoferulic acid Natural products COC1=CC=C(C=CC(O)=O)C=C1O QURCVMIEKCOAJU-UHFFFAOYSA-N 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 7
- 239000003999 initiator Substances 0.000 claims description 7
- 229920000573 polyethylene Polymers 0.000 claims description 7
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 10
- 239000005022 packaging material Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 51
- 230000000052 comparative effect Effects 0.000 description 15
- 239000001257 hydrogen Substances 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
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- 235000013305 food Nutrition 0.000 description 8
- 238000004132 cross linking Methods 0.000 description 7
- 230000003993 interaction Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 239000002202 Polyethylene glycol Substances 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 3
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- 238000001514 detection method Methods 0.000 description 2
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 2
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- 150000002513 isocyanates Chemical group 0.000 description 2
- 238000010128 melt processing Methods 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical group NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 description 1
- 229920000604 Polyethylene Glycol 200 Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
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- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 239000012793 heat-sealing layer Substances 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The application relates to the technical field of packaging materials, and particularly discloses a composite film, a preparation method of a microwave heating exhaust bag and the microwave heating exhaust bag. The composite membrane comprises a base layer membrane and an outer layer membrane, wherein the outer layer membrane is provided with an exhaust groove which is a through groove, and the base layer membrane is provided with an exhaust line communicated with the exhaust groove; the base layer film is prepared from the following raw materials in parts by weight: 75-100 parts of maleic anhydride modified polypropylene and 6-9 parts of hydroxyl silicone oil; the composite film can be used for preparing the microwave heating exhaust bag, and the problem that the heat resistance of the packaging bag for the microwave oven is poor is solved.
Description
Technical Field
The application relates to the technical field of packaging materials, in particular to a composite film, a preparation method of a microwave heating exhaust bag and the microwave heating exhaust bag.
Background
In recent years, the microwave heating mode of food is increasingly widely applied with the advantages of convenience and sanitation, and the phenomenon that the food is directly heated and packaged by using a microwave oven is more common along with the popularization of the application of the microwave oven. The food packaging bag is a container which is directly contacted with food and is used for containing and protecting the food, the food packaging bag is usually formed by heat sealing of a plastic film, and the plastic film for food packaging must meet various requirements of packaging materials, such as good stability, safety, attractiveness, economy and the like.
In the process of heating the packaged food by using a microwave oven, a large amount of hot steam is generated and accumulated in the packaging bag, and the common plastic film has poor heat resistance, and may deform or even decompose under the heating of the microwave oven, which affects the aesthetic property of the packaging bag and the safety of the food, so that the development of the packaging bag with good heat resistance is urgently needed.
Disclosure of Invention
In order to solve the problem that the heat resistance of a packaging bag for a microwave oven is poor, the application provides a composite film, a preparation method of a microwave heating exhaust bag and the microwave heating exhaust bag.
In a first aspect, the present application provides a composite film, which adopts the following technical scheme:
the composite membrane comprises a base layer membrane and an outer layer membrane, wherein the outer layer membrane is provided with an exhaust groove which is a through groove, and the base layer membrane is provided with an exhaust line communicated with the exhaust groove; the base layer film is prepared from the following raw materials in parts by weight: 75-100 parts of maleic anhydride modified polypropylene and 6-9 parts of hydroxyl silicone oil.
By adopting the technical scheme, the hydroxyl silicone oil contains silicon-oxygen bonds, the bond energy of the silicon-oxygen bonds is higher, and the high-temperature stability is better; hydroxyl on the hydroxyl silicone oil and the maleic anhydride modified polypropylene can be mutually crosslinked through hydrogen bond interaction to obtain a three-dimensional network structure with higher crosslinking degree, so that the heat resistance of the polypropylene is improved, and a base layer film with better heat resistance is obtained.
The exhaust line on the base layer membrane is a micro-cut hole, and the exhaust line is stretched under the action of high pressure during microwave heating, so that gas generated in the heating process is exhausted through the exhaust groove on the outer layer membrane; the base layer film and the outer layer film are made into the composite film, and then the composite film is made into the microwave heating exhaust bag, so that the exhaust bag can automatically exhaust when being heated, and has better heat resistance, thereby solving the problem of poor heat resistance of the packaging bag for the microwave oven.
Preferably, the maleic anhydride modified polypropylene is prepared from polypropylene, maleic anhydride, an initiator and a modification auxiliary agent according to a mass ratio of 100 (4-7): (0.1-0.3): 2-6).
By adopting the technical scheme, when the maleic anhydride modified polypropylene is prepared according to the mass ratio, the using amount of the initiator is moderate, the number of free radicals generated by the initiator is moderate, the number of generated active centers is moderate, the degradation reaction of the polypropylene in the modification process is mild, and the grafting rate of the maleic anhydride is high.
Preferably, the raw material of the base layer film also comprises 2-5 parts by weight of a reinforcing agent, wherein the reinforcing agent is one or more of tributyl citrate, ferulic acid and sodium lignosulfonate.
By adopting the technical scheme, the reinforcing agents all contain polar groups, and the polar groups can be mutually crosslinked with maleic anhydride modified polypropylene and hydroxyl silicone oil through hydrogen bond interaction, so that the crosslinking degree of the base layer film structure is further improved, and the heat resistance of the microwave heating exhaust bag is improved.
Preferably, the reinforcing agent is ferulic acid and/or sodium lignosulfonate.
By adopting the technical scheme, the ferulic acid and the sodium lignosulfonate not only contain polar groups, but also contain benzene rings, and the benzene rings have larger steric hindrance, so that the relative movement of molecular chain segments in the heating process can be hindered, and the heat resistance of the microwave heating exhaust bag is further improved.
Preferably, the modification assistant is polyethylene.
By adopting the technical scheme, the polyethylene and the polypropylene have good compatibility, can be uniformly mixed together during blending, and generate free radicals on a polyethylene chain under the action of an initiator, and the free radicals can capture hydrogen on methyl and methylene of the polypropylene, so that the polypropylene generates more methyl free radicals and methylene free radicals, the grafting position of maleic anhydride is increased, and the grafting rate of the maleic anhydride is improved.
Preferably, the modification auxiliary agent is titanium dioxide and/or hydroxyapatite.
By adopting the technical scheme, the titanium dioxide and the hydroxyapatite have the following functions: firstly, the titanium dioxide and the hydroxyapatite contain hydroxyl groups, so that maleic anhydride monomers can be adsorbed, the volatilization of the maleic anhydride is inhibited, the concentration of the maleic anhydride is improved, and the grafting rate of the maleic anhydride is further improved; secondly, hydroxyl groups on the titanium dioxide and the hydroxyapatite can be mutually crosslinked with hydroxyl silicone oil through hydrogen bond interaction, so that the crosslinking degree of the basic layer film structure is further improved; thirdly, under the action of rigid mechanical force of titanium dioxide and hydroxyapatite, more free radicals are generated on polypropylene, and the grafting rate of maleic anhydride is improved; fourthly, titanium dioxide and hydroxyapatite have good heat transfer performance, when the base layer membrane is heated, heat in the base layer membrane network structure can be transferred in time, the possibility of storing excessive heat inside the base layer membrane network structure is reduced, the possibility of damaging the base layer membrane network structure is reduced, the heat resistance of the microwave heating exhaust bag is further improved, and the titanium dioxide and the hydroxyapatite have a synergistic effect on improving the heat resistance of the microwave heating exhaust bag.
Preferably, the raw material of the base layer film also comprises 3-5 parts of isocyanate-terminated polyurethane prepolymer.
By adopting the technical scheme, the isocyanate-terminated polyurethane prepolymer is added into the raw material of the base layer film, and the isocyanate-terminated polyurethane prepolymer contains groups such as carbamate groups and the like, so that the isocyanate-terminated polyurethane prepolymer can be mutually crosslinked with maleic anhydride modified polypropylene and hydroxyl silicone oil through hydrogen bond interaction, the crosslinking degree of the base layer film structure is further improved, and the heat resistance of the microwave heating exhaust bag is improved.
Preferably, the outer layer film is a polyethylene terephthalate film.
In a second aspect, the present application provides a method for manufacturing a microwave heating exhaust bag, which adopts the following technical scheme:
the preparation method of the microwave heating exhaust bag comprises the following steps:
and (3) performing heat sealing processing on the composite film to obtain the microwave heating exhaust bag.
In a third aspect, the present application provides a microwave heating exhaust bag, which adopts the following technical solution:
the microwave heating exhaust bag is prepared by the preparation method of the microwave heating exhaust bag.
In summary, the present application has the following beneficial effects:
1. according to the microwave heating exhaust bag, maleic anhydride modified polypropylene and hydroxyl silicone oil are used as raw materials to prepare a base film, hydrogen bond interaction exists between the maleic anhydride modified polypropylene and the hydroxyl silicone oil to form a three-dimensional network cross-linking structure, the base film with good heat resistance is prepared, the base film and an outer film are used to prepare a composite film, and finally the composite film is used to prepare the microwave heating exhaust bag with good heat resistance, so that the problem that the heat resistance of the packaging bag for the microwave oven is poor is solved.
2. The titanium dioxide and/or the hydroxyapatite are preferably used as the modification auxiliary agent, and the titanium dioxide and/or the hydroxyapatite have the following effects: firstly, the titanium dioxide and the hydroxyapatite contain hydroxyl groups, so that maleic anhydride monomers can be adsorbed, the volatilization of the maleic anhydride is inhibited, and the grafting rate of the maleic anhydride on polypropylene is improved; secondly, hydroxyl groups on the titanium dioxide and the hydroxyapatite can be mutually crosslinked with hydroxyl silicone oil through hydrogen bond interaction, so that the crosslinking degree of the basic layer film structure is further improved; thirdly, under the action of rigid mechanical force of titanium dioxide and hydroxyapatite, more free radicals are generated on polypropylene, and the grafting rate of maleic anhydride is improved; fourthly, the titanium dioxide and the hydroxyapatite have good heat transfer performance, so that heat in the base layer film network structure can be transferred in time, the possibility of storing excessive heat in the base layer film network structure is reduced, and the possibility of damaging the base layer film network structure is reduced.
3. Ferulic acid and/or sodium lignin sulfonate are preferably selected as a reinforcing agent to be added into the raw material of the base layer film, the ferulic acid and the sodium lignin sulfonate can be crosslinked with other substances in the raw material of the base layer film through hydrogen bonds, a benzene ring structure is also introduced, and the heat resistance of the base layer film is further improved.
4. According to the method, the terminal isocyanate-based polyurethane prepolymer is selected as the raw material of the base layer film, and the terminal isocyanate-based polyurethane prepolymer can be crosslinked with other substances in the raw material of the base layer film through hydrogen bonds, so that the heat resistance of the base layer film is further improved.
Drawings
FIG. 1 is a schematic diagram of the construction of a microwave heating exhaust pocket according to the present application.
Fig. 2 is a schematic view of a base film and an outer film embodied in an embodiment of the present application.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is a schematic view showing a vent groove and a vent line in an embodiment of the present application.
Fig. 5 is an enlarged view of a portion B in fig. 4.
Description of reference numerals: 1. an outer film; 2. a base layer film; 3. an exhaust groove; 4. an exhaust line; 5. the sealing film is easy to uncover; 6. the microwave heats the exhaust pocket.
Detailed Description
The present application will be described in further detail with reference to examples.
Unless otherwise specified, the specifications of the raw materials used in the following examples and comparative examples are detailed in table 1.
TABLE 1 raw materials Specification information
| Raw materials | Specification of |
| Polyethylene glycol | The model is as follows: PEG200 |
| Polypropylene | The goods number is: k4912 |
| Polyethylene | The trade mark is as follows: YGH041 |
| Polyethylene terephthalate | The trade mark is as follows: RE5329 |
| Titanium dioxide | The model is as follows: climbing steel R-248 |
| Hydroxyapatite | The goods number is: GC-01-337 |
| Hydroxy silicone oil | The model is as follows: JP-203-1 |
Preparation example of isocyanate-terminated polyurethane prepolymer
Preparation example A
The isocyanate-terminated polyurethane prepolymer is prepared by the following steps:
drying polyethylene glycol at 110 ℃ in vacuum for 3h, cooling to 50 ℃, mixing and stirring 200g of dried polyethylene glycol with 260g of isophorone diisocyanate, 800g of acetone and 0.05g of dibutyltin dilaurate, heating to 60 ℃, carrying out heat preservation reaction for 2h, and evaporating the acetone under reduced pressure to obtain the isocyanate-terminated polyurethane prepolymer.
Preparation example of maleic anhydride-modified Polypropylene
Preparation example 1
The maleic anhydride modified polypropylene is prepared by the following steps:
mixing and stirring 40g of maleic anhydride, 80g of styrene and 20g of modifying auxiliary agent polyethylene, adding 1g of initiator lauroyl peroxide, mixing and stirring, adding 1000g of polypropylene subjected to vacuum deoxygenation, mixing and stirring, reacting at 25 ℃ for 12 hours, heating to 85 ℃, keeping the temperature for 20min, adding water preheated to 85 ℃, keeping the temperature for 4min, filtering, cooling, washing, and drying in vacuum to obtain the maleic anhydride modified polypropylene.
Preparation examples 2 to 4
Maleic anhydride-modified polypropylene, which is different from preparation example 1 in that: the raw materials of the maleic anhydride modified polypropylene have different compositions, and the specific compositions are shown in the following table 2:
TABLE 2 raw material composition of maleic anhydride modified Polypropylene
| Item | Polypropylene (g) | Maleic anhydride (g) | Initiator (g) | Modifying assistant (g) |
| Preparation example 1 | 1000 | 40 | 1 | 20 |
| Preparation example 2 | 1000 | 70 | 3 | 60 |
| Preparation example 3 | 1000 | 60 | 2 | 50 |
| Preparation example 4 | 1000 | 60 | 2 | 0 |
Preparation example 5
Maleic anhydride-modified polypropylene, which is different from preparation example 1 in that: the selection of the modification auxiliary agent is different, and the quality of polyethylene and the like is replaced by titanium dioxide in the preparation example.
Preparation example 6
Maleic anhydride-modified polypropylene, which is different from preparation example 1 in that: the selection of the modification auxiliary agent is different, and the preparation example replaces the polyethylene and other qualities with hydroxyapatite.
Preparation example 7
Maleic anhydride-modified polypropylene, which is different from preparation example 1 in that: the selection of the modification auxiliary agent is different, and 10g of titanium dioxide and 10g of hydroxyapatite are selected in the preparation example.
Examples
Example 1
The composite film has the following formula:
750g of maleic anhydride modified polypropylene and 60g of hydroxyl silicone oil.
The composite membrane is prepared by the following steps:
taking 60g of hydroxyl silicone oil and 750g of maleic anhydride modified polypropylene prepared in preparation example 1, mixing and stirring, adding into a double-screw extruder, and controlling the heating temperature of the double-screw extruder to be 170 ℃ to obtain a raw material of a base layer film; adding 350g of polyethylene glycol terephthalate into a double-screw extruder for melt processing; feeding 500g of raw material of the base layer film and 300g of polyethylene glycol terephthalate subjected to melt processing into a casting machine for co-extrusion film forming, and cooling to form an outer layer film and a base layer film which are sequentially connected to obtain a double-layer film;
and processing an exhaust groove on the outer layer film by adopting a laser cutting mode, wherein the shape of the exhaust groove is not limited, and the width of the exhaust groove is 2-10 mm. Then processing an exhaust line communicated with the exhaust groove on the base layer film, specifically punching the exhaust hole at the central position of the base layer film corresponding to the exhaust groove by using a punching pricker, wherein the direction is from the lower surface of the base layer film to the upper surface of the heat sealing layer, the diameter of the pinhole is 0.05mm, and the hole distance is 1mm. And finally, sealing the exhaust groove by the easily-uncovered film coated with the adhesive to obtain the composite film with good exhaust effect.
Examples 2 to 7
The composite membrane differs from example 1 in that: the selection of the maleic anhydride modified polypropylene is different, and the specific selection is shown in the following table 3:
TABLE 3 selection of maleic anhydride modified Polypropylene
| Item | Maleic anhydride modified polypropylene |
| Example 1 | Preparation example 1 |
| Example 2 | Preparation example 2 |
| Example 3 | Preparation example 3 |
| Example 4 | Preparation example 4 |
| Example 5 | Preparation example 5 |
| Example 6 | Preparation example 6 |
| Example 7 | Preparation example 7 |
Examples 8 to 9
The composite membrane differs from example 7 in that: the base layer films were different in composition from each other, and the specific composition was as shown in table 4 below:
TABLE 4 composition of raw materials for base layer film
Example 10
The composite membrane differs from example 9 in that: 20g of reinforcing agent tributyl citrate is added in the raw material of the base layer film.
Example 11
The composite membrane differs from example 9 in that: 20g of reinforcing agent ferulic acid is added in the raw material of the base layer film.
Example 12
The composite membrane differs from example 9 in that: 20g of intensifier sodium lignosulphonate is added in the raw material of the basal layer membrane.
Example 13
The composite membrane differs from example 12 in that: the mass of sodium lignosulfonate was different, and in this example the mass of sodium lignosulfonate was 50g.
Example 14
The composite membrane differs from example 13 in that: 30g of the isocyanate-terminated polyurethane prepolymer prepared in preparation example A is added to the raw materials of the base layer film.
Example 15
The composite membrane differs from example 13 in that: 50g of the isocyanate-terminated polyurethane prepolymer prepared in preparation example A was added to the raw material of the base film.
Comparative example
Comparative example 1
The composite membrane differs from example 1 in that: the base layer films were different in composition from each other, and the specific composition was as shown in table 5 below:
TABLE 5 composition of raw materials for base layer film
| Item | Maleic anhydride modified Polypropylene (g) | Hydroxy silicone oil (g) |
| Example 1 | 750 | 60 |
| Comparative example 1 | 810 | 0 |
Application example and comparative application example
The microwave heating exhaust bag is prepared by the following steps:
the composite films obtained in examples 1 to 15 and comparative example 1 were heat-sealed to obtain microwave heating exhaust bags, and the sources of the composite films used in the application examples and the application comparative example are shown in the following table 6:
TABLE 6 sources of composite membranes
| Item | Composite membrane | Item | Composite membrane |
| Application example 1 | Example 1 | Application example 9 | Example 9 |
| Application example 2 | Example 2 | Application example 10 | Example 10 |
| Application example 3 | Example 3 | Application example 11 | Example 11 |
| Application example 4 | Example 4 | Application example 12 | Examples12 |
| Application example 5 | Example 5 | Application example 13 | Example 13 |
| Application example 6 | Example 6 | Application example 14 | Example 14 |
| Application example 7 | Example 7 | Application example 15 | Example 15 |
| Application example 8 | Example 8 | Application comparative example 1 | Comparative example 1 |
Detection method
Taking the composite film samples prepared in the examples 1-15 and the comparative example 1, cutting the composite film samples to 15cm multiplied by 15cm, tightly adhering the composite film samples to a stainless steel plate surface with the thickness of 1mm, baking the other surface of the stainless steel by using an alcohol lamp until the composite film is curled, and testing the temperature of the stainless steel surface so as to represent the heat resistance of the composite film;
the tensile strength of the composite film samples prepared in examples 1-15 and comparative example 1 is detected by referring to the method in GB/T1040.1-2006, so as to represent the mechanical property of the composite film;
because the composite membrane is the main body material of the microwave heating exhaust bag, the performance of the microwave heating exhaust bag can be represented by testing the performance of the composite membrane, and the specific detection results are shown in the following table 7:
the result of the detection
TABLE 7 Performance testing of composite membranes
| Sample(s) | Tensile Strength (MPa) | Temperature (. Degree. C.) at which crimp of composite film is just developed |
| Example 1 | 22.7 | 153 |
| Example 2 | 23.2 | 155 |
| Example 3 | 23.4 | 157 |
| Example 4 | 21.5 | 147 |
| Example 5 | 23.6 | 156 |
| Example 6 | 23.5 | 158 |
| Example 7 | 24.1 | 163 |
| Example 8 | 24.3 | 165 |
| Example 9 | 25.4 | 170 |
| Example 10 | 26.1 | 174 |
| Example 11 | 26.6 | 178 |
| Example 12 | 26.9 | 179 |
| Example 13 | 27.2 | 181 |
| Example 14 | 27.7 | 186 |
| Example 15 | 27.9 | 189 |
| Comparative example 1 | 18.2 | 102 |
As can be seen from table 7, the tensile strength of the composite film prepared in this example is ≧ 21.5MPa, and the temperature at which the composite film just curls is ≧ 147 ℃, which indicates that the microwave heating exhaust bag prepared in this application has good heat resistance and good mechanical properties.
As can be seen from a combination of example 1 and comparative example 1 and table 7, the temperature 153 ℃ at which the composite film prepared in example 1 immediately shows curling is much higher than that of comparative example 1, probably because: the raw material of the base layer film in the comparative example 1 does not contain hydroxyl silicone oil, and hydrogen bond interaction exists between the hydroxyl silicone oil contained in the example 1 and the maleic anhydride modified polypropylene, so that the crosslinking degree of the base layer film structure is increased, and the heat resistance of the microwave heating exhaust bag is further improved.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The composite membrane is characterized in that: the film comprises a base layer film and an outer layer film, wherein the outer layer film is provided with an exhaust groove which is a through groove, and the base layer film is provided with an exhaust line communicated with the exhaust groove; the base layer film is prepared from the following raw materials in parts by weight: 75-100 parts of maleic anhydride modified polypropylene and 6-9 parts of hydroxyl silicone oil.
2. The composite membrane of claim 1, wherein: the maleic anhydride modified polypropylene is prepared from polypropylene, maleic anhydride, an initiator and a modification auxiliary agent according to the mass ratio of 100 (4-7) to (0.1-0.3) to (2-6).
3. The composite film of claim 1, wherein: the base layer film also comprises 2-5 parts by weight of a reinforcing agent, wherein the reinforcing agent is one or more of tributyl citrate, ferulic acid and sodium lignosulfonate.
4. The composite film of claim 3, wherein: the reinforcing agent is ferulic acid and/or sodium lignosulfonate.
5. The composite film of claim 2, wherein: the modifying auxiliary agent is polyethylene.
6. The composite membrane of claim 2, wherein: the modifying auxiliary agent is titanium dioxide and/or hydroxyapatite.
7. The composite film of claim 1, wherein: the raw materials of the base layer film also comprise 3-5 parts of isocyanate-terminated polyurethane prepolymer.
8. The composite film of claim 1, wherein: the outer layer film is a polyethylene terephthalate film.
9. The preparation method of the microwave heating exhaust bag is characterized by comprising the following steps: the composite membrane of any one of claims 1 to 8 is compositely processed to obtain a microwave heating exhaust bag.
10. Microwave heating exhaust bag, its characterized in that: the method of claim 9 wherein the vent bag is made by the method of making a microwave heating vent bag.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357968A (en) * | 2008-09-16 | 2009-02-04 | 中国科学院化学研究所 | Maleic anhydride-grafted polypropylene material and preparation method thereof |
| CN102991072A (en) * | 2012-12-17 | 2013-03-27 | 惠州宝柏包装有限公司 | Flexible packaging film capable of being composited by microwaves, automatic exhaust packaging film for microwave ovens, and packaging bag |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357968A (en) * | 2008-09-16 | 2009-02-04 | 中国科学院化学研究所 | Maleic anhydride-grafted polypropylene material and preparation method thereof |
| CN102991072A (en) * | 2012-12-17 | 2013-03-27 | 惠州宝柏包装有限公司 | Flexible packaging film capable of being composited by microwaves, automatic exhaust packaging film for microwave ovens, and packaging bag |
Non-Patent Citations (1)
| Title |
|---|
| 谭文丽: "基硅油改性聚丙烯酸酯粘合剂的制备与表征", 化工新型材料, vol. 37, no. 1, pages 94 - 96 * |
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