CN113912879A - Environment-friendly heat shrinkable film - Google Patents
Environment-friendly heat shrinkable film Download PDFInfo
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- CN113912879A CN113912879A CN202110964783.5A CN202110964783A CN113912879A CN 113912879 A CN113912879 A CN 113912879A CN 202110964783 A CN202110964783 A CN 202110964783A CN 113912879 A CN113912879 A CN 113912879A
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- 229920006257 Heat-shrinkable film Polymers 0.000 title claims abstract description 42
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 84
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 60
- 102000008186 Collagen Human genes 0.000 claims abstract description 58
- 108010035532 Collagen Proteins 0.000 claims abstract description 58
- 229920001436 collagen Polymers 0.000 claims abstract description 58
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 46
- 239000000126 substance Substances 0.000 claims abstract description 45
- 229920000728 polyester Polymers 0.000 claims abstract description 44
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 28
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 27
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 20
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 10
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 10
- 239000004611 light stabiliser Substances 0.000 claims abstract description 10
- 238000005886 esterification reaction Methods 0.000 claims abstract description 6
- 239000000839 emulsion Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 16
- 229930195729 fatty acid Natural products 0.000 claims description 16
- 239000000194 fatty acid Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 16
- 229920001610 polycaprolactone Polymers 0.000 claims description 16
- 239000004632 polycaprolactone Substances 0.000 claims description 16
- 239000004626 polylactic acid Substances 0.000 claims description 16
- -1 sucrose fatty acid esters Chemical class 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 8
- 229930006000 Sucrose Natural products 0.000 claims description 8
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 8
- 229920000223 polyglycerol Polymers 0.000 claims description 8
- 239000008117 stearic acid Substances 0.000 claims description 8
- 239000005720 sucrose Substances 0.000 claims description 8
- 230000007613 environmental effect Effects 0.000 claims description 5
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Natural products OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 235000021314 Palmitic acid Nutrition 0.000 claims description 2
- 235000013871 bee wax Nutrition 0.000 claims description 2
- 239000012166 beeswax Substances 0.000 claims description 2
- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004945 emulsification Methods 0.000 claims 1
- 229920002050 silicone resin Polymers 0.000 claims 1
- 238000013329 compounding Methods 0.000 abstract description 2
- 229920006280 packaging film Polymers 0.000 abstract description 2
- 239000012785 packaging film Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 125000004185 ester group Chemical group 0.000 abstract 2
- 230000032050 esterification Effects 0.000 abstract 2
- 230000001804 emulsifying effect Effects 0.000 description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 4
- 150000002148 esters Chemical class 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2487/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
本发明属于包装膜技术领域，具体涉及一种环保热收缩膜，该环保热收缩膜，其特征在于，包括以下质量份原料组成；聚酯50‑100份、可食性疏水物质0.5‑1份、乳化剂0.5‑1份、抗氧剂1.5‑2份和光稳定剂1.2‑1.7份、改性胶原蛋白1‑6份。本发明技术方案中，通过胶原蛋白先接枝聚乙二醇，然后与乙二酸发生酯化反应，再通过与乙二醇发生酯化反应，制得的改性胶原蛋白中，含有大量的酯基官能团，通过改性胶原蛋白中的酯基官能团能够实现与聚酯更好的复合，提高了聚酯颗粒在改性胶原蛋白的分散性，进而给予了聚酯热收缩薄膜更好的收缩性。The invention belongs to the technical field of packaging films, and in particular relates to an environment-friendly heat-shrinkable film. The environment-friendly heat-shrinkable film is characterized in that it comprises the following parts by mass of raw materials: 50-100 parts of polyester, 0.5-1 part of edible hydrophobic substances, 0.5-1 part of emulsifier, 1.5-2 parts of antioxidant, 1.2-1.7 parts of light stabilizer, and 1-6 parts of modified collagen. In the technical scheme of the present invention, the modified collagen is prepared by grafting polyethylene glycol first, then esterification with oxalic acid, and then esterification with ethylene glycol. The modified collagen contains a large amount of Ester functional group, by modifying the ester functional group in collagen, can achieve better compounding with polyester, improve the dispersibility of polyester particles in modified collagen, and then give polyester heat shrinkable film better shrinkage sex.
Description
Technical Field
The invention belongs to the technical field of packaging films, and particularly relates to an environment-friendly heat shrinkable film.
Background
Polyester heat-shrinkable film is a new type of heat-shrinkable packaging material. Because it has the characters of easy recovery, non-toxic, tasteless, good mechanical property, specially according with the environmental protection, etc., the polyester has become the ideal substitute for polyvinyl chloride heat-shrinkable film in developed countries, however, the common polyester is a crystalline high polymer, and the heat-shrinkable rate of the common film can only be obtained below 30% by special process treatment. If a polyester film with a higher heat shrinkage is to be obtained, modification is also necessary. That is, in order to prepare a polyester film having a high heat shrinkage rate, it is generally necessary to modify conventional polyesters by copolymerization or blending.
The animal collagen can shrink at the temperature of more than 60 ℃, the natural triple helical structure is irreversibly converted into a more random (curled) structure due to the breakage of hydrogen bonds and hydrophobic bonds between molecules and in molecules, and the animal collagen is used for modifying the polyester, so that the shrinkage rate of the polyester heat shrinkable film can be greatly improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an environment-friendly heat shrinkable film, which solves the problem of poor shrinkability of the traditional polyester heat shrinkable film and improves the shrinkability of the polyester heat shrinkable film.
In order to achieve the purpose, the invention is realized by the following scheme:
an environment-friendly heat shrinkable film is characterized by comprising the following raw materials in parts by mass; 50-100 parts of polyester, 1.5-2 parts of edible hydrophobic substance, emulsifier, antioxidant, 1.2-1.7 parts of light stabilizer and 1-6 parts of modified collagen.
Preferably, the polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 6-8: 1-3: 1.
Preferably, the edible hydrophobic substance is selected from one of stearic acid, palmitic acid and beeswax.
The environmentally friendly heat shrinkable film of claim 1, wherein: the edible emulsifier is at least one selected from sucrose fatty acid ester, citric acid glyceride and polyglycerol fatty acid ester.
Preferably, the preparation method of the environment-friendly heat shrinkable film is characterized in that: the method comprises the following steps:
(1) mixing collagen with polyethylene glycol, carrying out oil bath stirring reaction, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the dropwise adding of oxalic acid is finished to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substances and edible emulsifiers, and then carrying out homogenizing and emulsifying treatment by using a tissue triturator to obtain a hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film to obtain a finished product.
Preferably, the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol in the step (1) is 10-20: 1-5: 5-10: 1.
Preferably, the reaction temperature in the step (1) is 70-80 ℃, and the reaction time is 1-3 h.
Preferably, the temperature of heating in the step (2) is 50-60 ℃.
Preferably, the temperature for drying in the step (3) is 40-50 ℃.
Compared with the prior art, the method has the beneficial effects that:
(1) according to the technical scheme, the modified collagen prepared by grafting polyethylene glycol on the collagen, then carrying out esterification reaction with oxalic acid and then carrying out esterification reaction with ethylene glycol contains a large number of ester-based functional groups, and the ester-based functional groups in the modified collagen can realize better compounding with polyester, so that the dispersibility of polyester particles in the modified collagen is improved, and the polyester heat-shrinkable film is further provided with better contractility.
(2) In the technical scheme of the invention, the polyester is modified by the modified collagen, so that the contractility of the polyester heat-shrinkable film can be improved, in addition, raw materials such as polyethylene glycol, oxalic acid, ethylene glycol and the like used in the process of modifying the collagen have small pollution to the environment and can be degraded, and the modified collagen is used for the polyester heat-shrinkable film and can be degraded to meet the requirement of environmental protection.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 50 parts of polyester, 0.5 part of edible hydrophobic substance, 0.5 part of emulsifier, 1.5 parts of antioxidant, 1.2 parts of light stabilizer and 1 part of modified collagen.
The polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 7: 2: 1, the edible hydrophobic substance is stearic acid, and the emulsifier is sucrose fatty acid ester and polyglycerol fatty acid ester.
In this embodiment, a method for preparing an environmentally friendly heat shrinkable film includes the following steps:
(1) mixing collagen with polyethylene glycol, stirring in an oil bath for reaction at 75 ℃ for 2h, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the oxalic acid is dropwise added, wherein the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol is 15: 3: 7: 1, so as to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substances and an emulsifier, heating to 55 ℃, and carrying out homogenizing and emulsifying treatment by using a tissue triturator to obtain a hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so that a finished product is obtained.
Example 2
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 60 parts of polyester, 0.6 part of edible hydrophobic substance, 0.6 part of emulsifier, 1.6 parts of antioxidant, 1.3 parts of light stabilizer and 2 parts of modified collagen.
The polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 7: 2: 1, the edible hydrophobic substance is stearic acid, and the emulsifier is sucrose fatty acid ester and polyglycerol fatty acid ester.
In this embodiment, a method for preparing an environmentally friendly heat shrinkable film includes the following steps:
(1) mixing collagen with polyethylene glycol, stirring in an oil bath for reaction at 75 ℃ for 2h, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the oxalic acid is dropwise added, wherein the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol is 15: 3: 7: 1, so as to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substance and edible emulsifier at 55 deg.C, and homogenizing and emulsifying with a tissue triturator to obtain hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so that a finished product is obtained.
Example 3
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 70 parts of polyester, 0.7 part of edible hydrophobic substance, 0.7 part of emulsifier, 1.7 parts of antioxidant, 1.4 parts of light stabilizer and 3 parts of modified collagen.
The polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 7: 2: 1, the edible hydrophobic substance is stearic acid, and the emulsifier is sucrose fatty acid ester and polyglycerol fatty acid ester.
In this embodiment, a method for preparing an environmentally friendly heat shrinkable film includes the following steps:
(1) mixing collagen with polyethylene glycol, stirring in an oil bath for reaction at 75 ℃ for 2h, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the oxalic acid is dropwise added, wherein the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol is 15: 3: 7: 1, so as to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substances and an emulsifier, heating to 55 ℃, and carrying out homogenizing and emulsifying treatment by using a tissue triturator to obtain a hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so that a finished product is obtained.
Example 4
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 80 parts of polyester, 0.8 part of edible hydrophobic substance, 0.8 part of emulsifier, 1.8 parts of antioxidant, 1.5 parts of light stabilizer and 4 parts of modified collagen.
The polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 7: 2: 1, the edible hydrophobic substance is stearic acid, and the emulsifier is sucrose fatty acid ester and polyglycerol fatty acid ester.
In this embodiment, a method for preparing an environmentally friendly heat shrinkable film includes the following steps:
(1) mixing collagen with polyethylene glycol, stirring in an oil bath for reaction at 75 ℃ for 2h, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the oxalic acid is dropwise added, wherein the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol is 15: 3: 7: 1, so as to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substance and edible emulsifier at 55 deg.C, and homogenizing and emulsifying with a tissue triturator to obtain hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so that a finished product is obtained.
Example 5
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 90 parts of polyester, 0.9 part of edible hydrophobic substance, 0.9 part of emulsifier, 1.9 parts of antioxidant, 1.6 parts of light stabilizer and 5 parts of modified collagen.
The polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 7: 2: 1, the edible hydrophobic substance is stearic acid, and the edible emulsifier is at least one of sucrose fatty acid ester and polyglycerol fatty acid ester.
In this embodiment, a method for preparing an environmentally friendly heat shrinkable film includes the following steps:
(1) mixing collagen with polyethylene glycol, stirring in an oil bath for reaction at 75 ℃ for 2h, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the oxalic acid is dropwise added, wherein the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol is 15: 3: 7: 1, so as to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substances and an emulsifier, heating to 55 ℃, and carrying out homogenizing and emulsifying treatment by using a tissue triturator to obtain a hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so that a finished product is obtained.
Example 6
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 100 parts of polyester, 1 part of edible hydrophobic substance, 1 part of emulsifier, 2 parts of antioxidant, 1.7 parts of light stabilizer and 6 parts of modified collagen.
The polyester is composed of lactic acid-co-glycolic acid, polylactic acid and polycaprolactone, wherein the mass ratio of the lactic acid-co-glycolic acid to the polylactic acid to the polycaprolactone is 7: 2: 1, the edible hydrophobic substance is stearic acid, and the emulsifier is sucrose fatty acid ester and polyglycerol fatty acid ester.
In this embodiment, a method for preparing an environmentally friendly heat shrinkable film includes the following steps:
(1) mixing collagen with polyethylene glycol, stirring in an oil bath for reaction at 75 ℃ for 2h, dropwise adding oxalic acid after the reaction is finished, and dropwise adding ethylene glycol after the oxalic acid is dropwise added, wherein the mass ratio of the collagen to the polyethylene glycol, the oxalic acid and the ethylene glycol is 15: 3: 7: 1, so as to obtain modified collagen;
(2) heating and dissolving an aqueous solution containing edible hydrophobic substances and an emulsifier, heating to 55 ℃, and carrying out homogenizing and emulsifying treatment by using a tissue triturator to obtain a hydrophobic substance emulsion;
(3) and (3) mixing the modified collagen obtained in the step (1), the hydrophobic substance emulsion obtained in the step (2) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so that a finished product is obtained.
Comparative example
An environment-friendly heat shrinkable film comprises the following raw materials in parts by mass; 100 parts of polyester, 1 part of edible hydrophobic substance, 1 part of emulsifier, 2 parts of antioxidant, 1.7 parts of light stabilizer and 6 parts of collagen.
In this comparative example, a method for preparing an environmentally friendly heat shrinkable film comprises the steps of:
(1) heating and dissolving an aqueous solution containing edible hydrophobic substances and an emulsifier, heating to 55 ℃, and carrying out homogenizing and emulsifying treatment by using a tissue triturator to obtain a hydrophobic substance emulsion;
(2) mixing collagen, the hydrophobic substance emulsion obtained in the step (1) and polyester, homogenizing and emulsifying, defoaming, uniformly coating on organic silicon resin, drying, cooling to room temperature, and removing the film, wherein the drying temperature is 45 ℃, so as to obtain the finished product.
The finished products from examples 1-6 and comparative examples were tested for properties and the results are shown in Table 1 below:
TABLE 1
As can be seen from table 1, the environmentally friendly heat shrinkable film prepared according to the technical scheme of the present invention has better tensile strength, elongation at break and hydrothermal shrinkage than the comparative example.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
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| CN202110964783.5A CN113912879A (en) | 2021-08-20 | 2021-08-20 | Environment-friendly heat shrinkable film |
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Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11279272A (en) * | 1998-03-31 | 1999-10-12 | Japan Atom Energy Res Inst | Degradable shrink film |
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