CN115322525B - Multilayer composite transparent packaging bag and production process thereof - Google Patents
Multilayer composite transparent packaging bag and production process thereof Download PDFInfo
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- CN115322525B CN115322525B CN202211237313.XA CN202211237313A CN115322525B CN 115322525 B CN115322525 B CN 115322525B CN 202211237313 A CN202211237313 A CN 202211237313A CN 115322525 B CN115322525 B CN 115322525B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses a multilayer composite transparent packaging bag and a production process thereof, wherein the packaging bag comprises the following raw materials in parts by weight: 80-100 parts of degradable base material, 3-5 parts of polyethylene particles, 1-3 parts of nylon particles and 8-15 parts of reinforcing filler; through with degradable base stock, the polyethylene granule, the nylon granules is dissolved in N, behind N-dimethylformamide, under alkaline condition, add intensive filler ultrasonic treatment, make the spinning liquid, with spinning liquid electrostatic spinning, form the multilayer complex film, pull again, the printing, the heat-seal, make multilayer transparent packaging bag, this transparent packaging bag has used a small amount of polyethylene and nylon can strengthen the intensity of wrapping bag, it can not damaged easily to have guaranteed the wrapping bag, degradable base stock has very good biodegradability, can degrade completely, and the mechanical strength of promotion base stock that hyperbranched structure can be fine, with the interlude distribution of side chain polyester structure, make the mechanical properties of material further promote.
Description
Technical Field
The invention relates to the technical field of packaging bag preparation, in particular to a multilayer composite transparent packaging bag and a production process thereof.
Background
The daily wrapping bag that uses of people is mostly the wrapping bag of plastics material. The plastic packaging bag brings great convenience to the life of people, but the convenience brings long-term harm. The plastic package has low recycling value, and besides being scattered in urban streets, tourist areas, water bodies and two sides of roads and railways to cause visual pollution in the using process, the plastic package has potential hazards, for example, the traditional plastic package has stable structure, is not easily degraded by natural microorganisms, and is not separated in the natural environment for a long time, which means that the waste plastic package becomes pollutants in the environment to be permanently existed and continuously accumulated if not recycled, thereby causing great harm to the environment.
At present, various degradable plastic packaging bags are available on the market, but tests show that: most degradable plastic packaging bags begin to become thin, lose weight and decrease in strength after being exposed to the environment for 3 months, and gradually break into fragments, if the fragments are buried in garbage or soil, the degradation effect is not obvious, and a lot of traditional high polymer materials are needed to be added, so that the degradation speed of the degradable packaging bags is still slow.
Disclosure of Invention
The invention aims to provide a multilayer composite transparent packaging bag and a production process thereof, and solves the problems of high degradation difficulty and low mechanical strength of the transparent packaging bag in the prior art.
The purpose of the invention can be realized by the following technical scheme:
a multilayer composite transparent packaging bag comprises the following raw materials in parts by weight: 80-100 parts of degradable base material, 3-5 parts of polyethylene particles, 1-3 parts of nylon particles and 8-15 parts of reinforcing filler.
Further, the degradable base stock is prepared by the following steps:
step A1: dissolving gamma-cyclodextrin in deionized water, adding lactide and stannous chloride, reacting for 40-50h at the rotation speed of 200-300r/min and the temperature of 130-135 ℃, distilling to remove the deionized water, adding a substrate into ethanol, standing for 10-15min, filtering to remove filtrate, dissolving the substrate in dichloromethane, adding maleic anhydride and triethylamine, reacting for 20-25h at the rotation speed of 150-200r/min and the temperature of 30-40 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove the filtrate, and drying the filter cake to obtain modified cyclodextrin;
step A2: uniformly mixing modified cyclodextrin, epoxy castor oil, p-toluenesulfonic acid and N, N-dimethylformamide, reacting for 8-10h at the rotation speed of 150-200r/min and the temperature of 120-130 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove filtrate, and drying the filter cake to obtain hyperbranched cyclodextrin;
step A3: uniformly mixing 2-amino-1, 3-propanediol, lactic acid and terephthalic acid, stirring and adding tetrabutyl titanate under the conditions of a rotation speed of 120-150r/min and a temperature of 210-230 ℃, reacting for 3-5h, heating to a temperature of 250-260 ℃, preserving heat for 40-50min under a vacuum condition, cooling to a temperature of 55-60 ℃, filtering to remove filtrate, uniformly mixing a substrate, hyperbranched cyclodextrin and N, N-dimethylformamide, adjusting the pH value to be alkaline, reacting for 6-8h, and distilling to remove N, N-dimethylformamide to obtain the degradable base material.
Further, the molar ratio of the gamma-cyclodextrin to the lactide in the step A1 is 1.
Further, the mass ratio of the modified cyclodextrin and the epoxidized castor oil in the step A2 is 5.
Further, the molar ratio of 2-amino-1, 3-propanediol, lactic acid and terephthalic acid in the step A3 is 2.5.
Further, the reinforcing filler is prepared by the following steps:
dissolving citric acid in water, stirring and dropwise adding thionyl chloride under the conditions that the rotation speed is 200-300r/min and the temperature is 40-50 ℃, stirring for 1-2h to prepare an intermediate 1, dispersing graphene oxide in deionized water, stirring and adding the intermediate 1 and p-toluenesulfonic acid under the conditions that the rotation speed is 150-200r/min and the temperature is 30-40 ℃, heating to 120-130 ℃ after the addition is finished, carrying out reflux treatment for 6-8h, filtering to remove filtrate, and drying a filter cake to prepare the reinforced filler.
Further, the molar ratio of the citric acid to the thionyl chloride is 1.
A production process of a multilayer composite transparent packaging bag specifically comprises the following steps:
adding degradable base material, polyethylene particles and nylon particles into N, N-dimethylformamide, stirring until the degradable base material, the polyethylene particles and the nylon particles are completely dissolved under the conditions that the rotating speed is 150-200r/min and the temperature is 40-50 ℃, adding sodium hydroxide to adjust the pH value to be 8-9, adding reinforcing filler, carrying out ultrasonic treatment for 3-5h under the condition that the frequency is 30-50kHz to prepare spinning solution, carrying out electrostatic spinning and drying under the conditions that the voltage is 20-30kV, the receiving distance is 20-30cm and the advancing speed is 0.9-1.8mL/h to prepare a multilayer composite film, and carrying out traction, printing and heat sealing on the composite film to prepare the multilayer composite transparent packaging bag.
The invention has the beneficial effects that: the multilayer composite transparent packaging bag prepared by the invention is prepared by dissolving degradable base material, polyethylene particles and nylon particles in N, N-dimethylformamide, adding reinforced filler for ultrasonic treatment under alkaline conditions to prepare spinning solution, carrying out electrostatic spinning on the spinning solution to form a multilayer composite film, carrying out traction, printing and heat sealing to prepare the multilayer transparent packaging bag, wherein a small amount of polyethylene and nylon used in the transparent packaging bag can enhance the strength of the packaging bag, ensuring that the packaging bag cannot be easily damaged, simultaneously reducing the degradation difficulty of the packaging bag and reducing the environmental pollution, the degradable base material takes gamma-cyclodextrin as a raw material, lactide is polymerized at the external hydroxyl of the gamma-cyclodextrin under the action of stannous chloride, then the lactide is subjected to ring-opening esterification with maleic anhydride to prepare modified cyclodextrin, and the modified cyclodextrin reacts with epoxy castor oil, the hydroxyl in the molecule of the epoxy castor oil is esterified with the carboxyl in the molecule of the modified cyclodextrin to form a hyperbranched structure to prepare hyperbranched cyclodextrin, 2-amino-1, 3-propanediol, lactic acid and terephthalic acid are esterified and then are polycondensed to form copolyester, the copolyester and the hyperbranched cyclodextrin react under alkaline conditions to ensure that the amino on the molecule of the copolyester reacts with the epoxy on the hyperbranched cyclodextrin to prepare the degradable base material, the degradable base material has good biodegradability and can be completely degraded, the hyperbranched structure can well improve the mechanical strength of the base material and the interpenetrating distribution of side chain polyester structures to further improve the mechanical property of the material, the reinforcing filler takes the citric acid as a raw material to react with thionyl chloride to ensure that the carboxyl on the citric acid is converted into acyl chloride to prepare an intermediate 1, the preparation method comprises the steps of dispersing graphene oxide in deionized water, adding the intermediate 1, carrying out esterification reaction under the action of p-toluenesulfonic acid, enabling hydroxyl on the intermediate 1 to react with carboxyl on the graphene oxide to prepare the reinforced filler, adding the reinforced filler, grafting acyl chloride on the surface of the reinforced filler with the hydroxyl in degradable base material molecules, forming coating on the surface of the filler, and further improving the toughness and impact resistance of the base material.
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
A multilayer composite transparent packaging bag comprises the following raw materials in parts by weight: 80 parts of degradable base material, 3 parts of polyethylene particles, 1 part of nylon particles and 8 parts of reinforcing filler;
the multilayer composite transparent packaging bag is prepared by the following steps:
adding degradable base material, polyethylene particles and nylon particles into N, N-dimethylformamide, stirring until the degradable base material, the polyethylene particles and the nylon particles are completely dissolved under the conditions that the rotating speed is 150r/min and the temperature is 40 ℃, adding sodium hydroxide to adjust the pH value to be 8, adding reinforcing filler, carrying out ultrasonic treatment for 3 hours under the condition that the frequency is 30kHz to prepare spinning solution, carrying out electrostatic spinning under the conditions that the voltage is 20kV, the receiving distance is 20cm and the propelling speed is 0.9mL/h, drying at the temperature of 150 ℃ to prepare a multilayer composite film, and carrying out traction, printing and heat sealing on the composite film to prepare the multilayer composite transparent packaging bag.
The degradable base stock is prepared by the following steps:
step A1: dissolving gamma-cyclodextrin in deionized water, adding lactide and stannous chloride, reacting for 40 hours at the temperature of 130 ℃ at the rotation speed of 200r/min, distilling to remove the deionized water, adding a substrate into ethanol, standing for 10 minutes, filtering to remove filtrate, dissolving the substrate in dichloromethane, adding maleic anhydride and triethylamine, reacting for 20 hours at the rotation speed of 150r/min at the temperature of 30 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove the filtrate, and drying a filter cake to obtain modified cyclodextrin;
step A2: uniformly mixing modified cyclodextrin, epoxy castor oil, p-toluenesulfonic acid and N, N-dimethylformamide, reacting for 8 hours at the rotation speed of 150r/min and the temperature of 120 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove filtrate, and drying a filter cake to obtain hyperbranched cyclodextrin;
step A3: uniformly mixing 2-amino-1, 3-propanediol, lactic acid and terephthalic acid, stirring and adding tetrabutyl titanate under the conditions of a rotating speed of 120r/min and a temperature of 210 ℃, reacting for 3 hours, heating to a temperature of 250 ℃, preserving heat for 40 minutes under a vacuum condition, cooling to a temperature of 55 ℃, filtering to remove filtrate, uniformly mixing a substrate, hyperbranched cyclodextrin and N, N-dimethylformamide, adjusting the pH value to be alkaline, reacting for 6 hours, and distilling to remove the N, N-dimethylformamide to prepare the degradable base material.
The molar ratio of the gamma-cyclodextrin to the lactide in the step A1 is 1.
The mass ratio of the modified cyclodextrin and the epoxy castor oil in the step A2 is 5.
The molar ratio of the 2-amino-1, 3-propanediol, the lactic acid and the terephthalic acid in the step A3 is 2.5.
The reinforcing filler is prepared by the following steps:
dissolving citric acid in water, stirring and dropwise adding thionyl chloride under the conditions that the rotating speed is 200r/min and the temperature is 40 ℃, stirring for 1h to prepare an intermediate 1, dispersing graphene oxide in deionized water, stirring and adding the intermediate 1 and p-toluenesulfonic acid under the conditions that the rotating speed is 150r/min and the temperature is 30 ℃, heating to 120 ℃ after the addition is finished, refluxing for 6h, filtering to remove filtrate, and drying a filter cake to prepare the reinforcing filler.
The molar ratio of the citric acid to the thionyl chloride is 1.
Example 2
A multilayer composite transparent packaging bag comprises the following raw materials in parts by weight: 90 parts of degradable base material, 4 parts of polyethylene particles, 2 parts of nylon particles and 12 parts of reinforcing filler;
the multilayer composite transparent packaging bag is prepared by the following steps:
adding degradable base material, polyethylene particles and nylon particles into N, N-dimethylformamide, stirring until the degradable base material, the polyethylene particles and the nylon particles are completely dissolved under the conditions that the rotating speed is 180r/min and the temperature is 45 ℃, adding sodium hydroxide to adjust the pH value to be 8, adding reinforcing filler, carrying out ultrasonic treatment for 4 hours under the condition that the frequency is 40kHz to prepare spinning solution, carrying out electrostatic spinning under the conditions that the voltage is 25kV, the receiving distance is 25cm and the propelling speed is 13mL/h, drying at the temperature of 155 ℃ to prepare a multilayer composite film, and carrying out traction, printing and heat sealing on the composite film to prepare the multilayer composite transparent packaging bag.
The degradable base stock is prepared by the following steps:
step A1: dissolving gamma-cyclodextrin in deionized water, adding lactide and stannous chloride, reacting for 45 hours at the rotation speed of 200r/min and the temperature of 133 ℃, distilling to remove the deionized water, adding a substrate into ethanol, standing for 13 minutes, filtering to remove filtrate, dissolving the substrate in dichloromethane, adding maleic anhydride and triethylamine, reacting for 23 hours at the rotation speed of 180r/min and the temperature of 35 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove the filtrate, and drying a filter cake to obtain modified cyclodextrin;
step A2: uniformly mixing modified cyclodextrin, epoxy castor oil, p-toluenesulfonic acid and N, N-dimethylformamide, reacting for 9 hours at the rotation speed of 180r/min and the temperature of 125 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove filtrate, and drying a filter cake to obtain hyperbranched cyclodextrin;
step A3: uniformly mixing 2-amino-1, 3-propanediol, lactic acid and terephthalic acid, stirring and adding tetrabutyl titanate under the conditions of a rotation speed of 120r/min and a temperature of 220 ℃, reacting for 4 hours, heating to 255 ℃, preserving heat for 45 minutes under a vacuum condition, cooling to 58 ℃, filtering to remove filtrate, uniformly mixing a substrate, hyperbranched cyclodextrin and N, N-dimethylformamide, adjusting the pH value to be alkaline, reacting for 7 hours, and distilling to remove the N, N-dimethylformamide to obtain the degradable base material.
The molar ratio of the gamma-cyclodextrin to the lactide in the step A1 is 1.
The mass ratio of the modified cyclodextrin and the epoxy castor oil in the step A2 is 5.
The molar ratio of the 2-amino-1, 3-propanediol, the lactic acid and the terephthalic acid in the step A3 is 2.5.
The reinforcing filler is prepared by the following steps:
dissolving citric acid in water, stirring and dropwise adding thionyl chloride under the conditions that the rotating speed is 300r/min and the temperature is 45 ℃, stirring for 1.5 hours to prepare an intermediate 1, dispersing graphene oxide in deionized water, stirring and adding the intermediate 1 and p-toluenesulfonic acid under the conditions that the rotating speed is 180r/min and the temperature is 35 ℃, heating to 125 ℃ after adding is finished, refluxing for 7 hours, filtering to remove filtrate, and drying filter cakes to prepare the reinforced filler.
The molar ratio of the citric acid to the thionyl chloride is 1.
Example 3
A multilayer composite transparent packaging bag comprises the following raw materials in parts by weight: 100 parts of degradable base material, 5 parts of polyethylene particles, 3 parts of nylon particles and 15 parts of reinforcing filler;
the multilayer composite transparent packaging bag is prepared by the following steps:
adding degradable base materials, polyethylene particles and nylon particles into N, N-dimethylformamide, stirring until the degradable base materials, the polyethylene particles and the nylon particles are completely dissolved at the rotation speed of 200r/min and the temperature of 50 ℃, adding sodium hydroxide to adjust the pH value to 9, adding reinforcing filler, carrying out ultrasonic treatment for 5 hours at the frequency of 50kHz to prepare spinning solution, carrying out electrostatic spinning and drying at the temperature of 160 ℃ under the conditions of the voltage of 30kV, the receiving distance of 30cm and the propelling speed of 1.8mL/h to prepare a multilayer composite film, and carrying out traction, printing and heat sealing on the composite film to prepare the multilayer composite transparent packaging bag.
The degradable base material is prepared by the following steps:
step A1: dissolving gamma-cyclodextrin in deionized water, adding lactide and stannous chloride, reacting for 50 hours at the rotation speed of 300r/min and the temperature of 135 ℃, distilling to remove the deionized water, adding a substrate into ethanol, standing for 15 minutes, filtering to remove filtrate, dissolving the substrate in dichloromethane, adding maleic anhydride and triethylamine, reacting for 25 hours at the rotation speed of 200r/min and the temperature of 40 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove the filtrate, and drying a filter cake to obtain modified cyclodextrin;
step A2: uniformly mixing modified cyclodextrin, epoxy castor oil, p-toluenesulfonic acid and N, N-dimethylformamide, reacting for 10 hours at the rotation speed of 200r/min and the temperature of 130 ℃, distilling to remove the solvent, adding deionized water, uniformly mixing, filtering to remove filtrate, and drying a filter cake to obtain hyperbranched cyclodextrin;
step A3: uniformly mixing 2-amino-1, 3-propanediol, lactic acid and terephthalic acid, stirring and adding tetrabutyl titanate under the conditions of a rotation speed of 150r/min and a temperature of 230 ℃, reacting for 5 hours, heating to 260 ℃, preserving heat for 50 minutes under a vacuum condition, cooling to 60 ℃, filtering to remove filtrate, uniformly mixing a substrate, hyperbranched cyclodextrin and N, N-dimethylformamide, adjusting the pH value to be alkaline, reacting for 8 hours, and distilling to remove the N, N-dimethylformamide to obtain the degradable base material.
The molar ratio of the gamma-cyclodextrin to the lactide in the step A1 is 1.
The mass ratio of the modified cyclodextrin and the epoxy castor oil in the step A2 is 5.
The molar ratio of the 2-amino-1, 3-propanediol, the lactic acid and the terephthalic acid in the step A3 is 2.5.
The reinforcing filler is prepared by the following steps:
dissolving citric acid in water, stirring and dropwise adding thionyl chloride under the conditions that the rotating speed is 300r/min and the temperature is 50 ℃, stirring for 2 hours to prepare an intermediate 1, dispersing graphene oxide in deionized water, stirring and adding the intermediate 1 and p-toluenesulfonic acid under the conditions that the rotating speed is 200r/min and the temperature is 40 ℃, heating to 130 ℃ after adding is finished, carrying out reflux treatment for 8 hours, filtering to remove filtrate, and drying a filter cake to prepare the reinforcing filler.
The molar ratio of the citric acid to the thionyl chloride is 1.
Comparative example 1
This comparative example is the degradable packaging bag disclosed in example 1 of chinese patent CN 110791004A.
Comparative example 2
The comparative example is the degradable packaging bag disclosed in the embodiment 1 in the Chinese patent CN 106750566A.
The degradable packaging bags prepared in the examples 1-3 and the comparative examples 1-2 are 8 filaments thick, the tensile strength is detected according to the GB/T12914-2008 standard, the tear strength is detected according to the GB/T10808-2006 standard, the degradable packaging bags are buried in soil with the temperature of 25 ℃, the humidity of 70% and the depth of 10cm for 1 month, and the degradation rate is calculated;
。
as can be seen from the above table, the tensile strength of the degradable packaging bags prepared in the embodiments 1-3 is 52.1-53.5MPa, the tear strength is 63.8-65.2KN/m, and the degradation rate is 82.5-87.3%, which shows that the degradable packaging bags have good degradation effect and mechanical strength.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (6)
1. The utility model provides a compound transparent packaging bag of multilayer which characterized in that: the feed comprises the following raw materials in parts by weight: 80-100 parts of degradable base material, 3-5 parts of polyethylene particles, 1-3 parts of nylon particles and 8-15 parts of reinforcing filler;
the degradable base stock is prepared by the following steps:
step A1: dissolving gamma-cyclodextrin in deionized water, adding lactide and stannous chloride, reacting, distilling to remove the deionized water, adding a substrate into ethanol, standing, filtering to remove filtrate, dissolving the substrate in dichloromethane, adding maleic anhydride and triethylamine, reacting, distilling to remove the solvent, adding the mixture into the deionized water, uniformly mixing, filtering to remove the filtrate, and drying a filter cake to obtain modified cyclodextrin;
step A2: mixing modified cyclodextrin, epoxy castor oil, p-toluenesulfonic acid and N, N-dimethylformamide for reaction, distilling to remove a solvent, adding deionized water for uniform mixing, filtering to remove a filtrate, and drying a filter cake to obtain hyperbranched cyclodextrin;
step A3: mixing and stirring 2-amino-1, 3-propanediol, lactic acid and terephthalic acid, adding tetrabutyl titanate, reacting, heating, keeping the temperature under a vacuum condition, cooling, filtering to remove filtrate, uniformly mixing a substrate, hyperbranched cyclodextrin and N, N-dimethylformamide, adjusting the pH value to be alkaline, reacting, and distilling to remove the N, N-dimethylformamide to obtain a degradable base material;
the reinforcing filler is prepared by the following steps:
dissolving citric acid in water, stirring and dropwise adding thionyl chloride for reaction to prepare an intermediate 1, dispersing graphene oxide in deionized water, stirring and adding the intermediate 1 and p-toluenesulfonic acid, heating and refluxing after the addition is finished, filtering to remove filtrate, and drying a filter cake to prepare the reinforced filler.
2. The multilayer composite transparent packaging bag according to claim 1, characterized in that: the molar ratio of the gamma-cyclodextrin to the lactide in the step A1 is 1.
3. The multilayer composite transparent packaging bag according to claim 1, characterized in that: the mass ratio of the modified cyclodextrin and the epoxy castor oil in the step A2 is 5.
4. The multilayer composite transparent packaging bag according to claim 1, wherein: the molar ratio of the 2-amino-1, 3-propanediol, the lactic acid and the terephthalic acid in the step A3 is 2.5.
5. The multilayer composite transparent packaging bag according to claim 1, characterized in that: the molar ratio of the citric acid to the thionyl chloride is 1.
6. The production process of the multilayer composite transparent packaging bag according to claim 1, specifically comprising the following steps: adding the degradable base material, polyethylene particles and nylon particles into N, N-dimethylformamide, stirring until the degradable base material, the polyethylene particles and the nylon particles are completely dissolved, adding sodium hydroxide to adjust the pH value, adding reinforcing filler, carrying out ultrasonic treatment to prepare spinning solution, carrying out electrostatic spinning and drying to prepare a multilayer composite film, and carrying out traction, printing and heat sealing on the composite film to prepare the multilayer composite transparent packaging bag.
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| CN105017645A (en) * | 2015-08-05 | 2015-11-04 | 安徽顺彤包装材料有限公司 | High-strength plastic film used for packaging |
| CN110423441B (en) * | 2019-07-09 | 2021-11-30 | 中山市金群瑞科技有限公司 | Degradable food packaging material and preparation method thereof |
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