Environment-friendly degradable transparent plastic film and preparation method thereof

Abstract

The invention relates to the technical field of degradable plastics, and discloses an environment-friendly degradable transparent plastic film, which is prepared from a filling agent, polylactic acid, poly (butylene succinate), an auxiliary agent, glass fibers and a plasticizer. The formula comprises the following components in percentage by mass: 25%-35% of filler, 20%-35% of polylactic acid, 15%-25% of poly (butylene succinate), 3%-7% of auxiliaries, 8%-12% of glass fiber and 3%-7% of plasticizer. The invention discloses a preparation method of an environment-friendly degradable transparent plastic film. The preparation method comprises the following steps: 1) pretreating raw materials; 2) mixing the raw materials; the invention discloses an environment-friendly degradable transparent plastic film and a preparation method thereof.The environment-friendly degradable transparent plastic film and the preparation method thereof have the advantages that good strength, flexibility, transparency, strength and rigidity can be achieved, and the plastic film can be applied to all walks of life and can be quickly degraded to achieve the environment-friendly purpose.

Description

Technical Field

[0001] The invention relates to the technical field of degradable plastics, in particular to an environmentally friendly degradable transparent plastic film and a preparation method thereof. Background Art

[0002] At present, plastics are widely developed in many fields due to their advantages such as light weight, high strength, stable chemical properties and low cost. Plastics have brought various conveniences to people's daily lives, but since organic high molecular polymers are difficult to degrade, they have caused serious pollution. In particular, there is no proper disposal method for used plastics. Plastic waste is increasingly polluting the natural environment and posing a greater threat to human survival. Plastic products are consumables in daily life and industrial production, and are used in large quantities, making waste recycling and treatment difficult.

[0003] At present, most non-degradable plastics are made of low-density polyethylene and linear low-density polyethylene, followed by high-density polyethylene, polypropylene, polystyrene and polyvinyl chloride. Because they are non-degradable, these plastics are more troublesome to handle, so they are generally disposed of as solid waste, resulting in the formation of pollutants such as acid rain in the air, causing serious harm to our lives. With the development of the times and the advancement of science and technology, in order to achieve sustainable development, all walks of life have begun to demand more and more environmentally friendly degradable plastics. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an environmentally friendly degradable transparent plastic film and a preparation method thereof. The transparent plastic film has various properties such as good strength, flexibility, transparency, strength and rigidity, and can be quickly degraded to achieve environmental protection, thereby solving the problem that non-degradable plastics are troublesome to handle and pollute the environment during handling.

[0005] In order to achieve the above-mentioned transparent plastic film to achieve good strength, flexibility, transparency, strength and rigidity and other properties, and at the same time be able to be quickly degraded to achieve environmental protection purposes, the present invention provides the following technical solutions: an environmentally friendly degradable transparent plastic film, the degradable transparent plastic film formula includes filler, polylactic acid, polybutylene succinate, additives, glass fiber and plasticizer; The filler helps to reduce costs and improve biodegradability; The polylactic acid is used as the main biodegradable component to provide good biocompatibility and transparency; The polybutylene succinate is used to provide good processing performance and mechanical properties; The auxiliary agent improves the stability and durability of the plastic film through stabilizers and antioxidants; The glass fiber is used to enhance the strength and rigidity of the plastic film; The plasticizer is used to improve the flexibility of plastic films Preferably, the mass ratio of each component in the formula is: filler 25%-35%, polylactic acid 20%-35%, polybutylene succinate 15%-25%, additive 3%-7%, glass fiber 8%-12%, and plasticizer 3%-7%.

[0006] Preferably, the filler in the formula can be corn starch, potato starch, sweet potato starch, tapioca starch, and modified starch.

[0007] Preferably, calcium carbonate is added as a filler in the formula to improve the rigidity and heat resistance of the plastic film.

[0008] Preferably, enzymatic PLA is added to the polylactic acid in the formula as needed, and rapid biodegradation is achieved by enzymatic PLA while maintaining mechanical properties.

[0009] A method for preparing an environmentally friendly degradable transparent plastic film comprises the following steps: 1) Pre-treat the raw materials, and perform corresponding pre-treatment on each different formula raw material; 2) Mix the raw materials. First, mix the filler, polybutylene succinate and polylactic acid PLA through a mixer to ensure uniform distribution, and then gradually add the plasticizer to ensure that it is completely dispersed in the mixture; 3) Add additives, such as stabilizers and antioxidants as needed to improve the performance and stability of the material; 4) Melt mixing: melt the mixture at high temperature to ensure that all components are fully mixed and the glass fibers are evenly dispersed; 5) Extrusion film blowing: the mixed raw materials are melted and extruded in a twin-screw extruder, and then blown into a plastic film through a film blowing die; 6) Cooling and shaping: the blown plastic film is cooled and shaped through a cooling roller to ensure the physical properties of the film; 7) Surface modification treatment: plasma, chemical treatment and UV curing surface treatment of plastic film after cooling and shaping; 8) Film rolling: rolling up the plastic film after surface modification, preparing for subsequent cutting and packaging; 9) Quality inspection: testing the performance of plastic films including transparency, mechanical properties, and thickness uniformity to ensure that they meet standard requirements; 10) Packing and warehousing: the qualified plastic film is cut and packaged, marked with production date and batch number, and then put into storage.

[0010] Preferably, the pretreatment of raw materials specifically includes drying and grinding the filler using starch into fine powder to improve its dispersibility in the mixture; drying polybutylene succinate and polylactic acid at an appropriate temperature to remove moisture and prevent degradation; and cutting or crushing the glass fiber according to the required size.

[0011] Preferably, the extrusion film blowing includes setting the extrusion temperature according to the melting points of the raw materials, while the film blowing requires controlling the temperature, pressure and cooling rate during the film blowing process.

[0012] Preferably, the surface modification treatment includes using a plasma treatment device to treat the surface of the plastic film after the plastic film has been cooled, wherein the treatment time, power and gas type need to be adjusted according to the plastic film material and the expected surface properties, and plasma is generated by exciting gases such as argon, oxygen or air to bombard the surface of the plastic film, and chemical treatment is performed after the plasma treatment, wherein the plastic film is immersed in a specific chemical solution, or the surface of the plastic film is treated with chemical vapor, and new functional groups are introduced or the surface morphology is changed by chemical treatment.

[0013] Preferably, the surface modification treatment also includes coating a layer of photosensitive coating or resin on the surface of the plastic film and then curing it using ultraviolet light curing equipment, initiating the photoinitiator in the coating by ultraviolet light irradiation, generating free radicals and initiating a polymerization reaction to form a solid polymer, and the curing time, ultraviolet light intensity and coating formula ratio are adjusted according to the plastic film material and the expected surface hardness.

[0014] Compared with the prior art, the present invention provides an environmentally friendly, degradable, transparent plastic film and a preparation method thereof, which has the following beneficial effects: 1. The environmentally friendly degradable transparent plastic film uses various types of starch as fillers to reduce manufacturing costs, uses polylactic acid as the main biodegradable component to provide good biocompatibility and transparency, uses calcium carbonate to improve the rigidity and heat resistance of the plastic film, adds enzymatic PLA to achieve rapid biodegradation while maintaining mechanical properties, and combines different materials to enable the transparent plastic film to achieve good strength, flexibility, transparency, strength, rigidity and other properties, so that the plastic film can be applied to different needs of various industries, and can be quickly degraded to achieve the purpose of pollution-free and environmental protection.

[0015] 2. The preparation method of the environmentally friendly degradable transparent plastic film comprises the following steps: subjecting the film to surface modification treatments such as thin film plasma, chemical treatment and ultraviolet light curing after cooling and shaping, generating plasma through exciting gas such as argon, oxygen or air, bombarding the surface of the plastic film, thereby improving the surface properties of the plastic film, improving its printability and adhesion, immersing the plastic film in a specific chemical solution, or treating the surface of the plastic film with chemical vapor, introducing new functional groups or changing the surface morphology through chemical treatment, further improving the surface energy and wettability of the plastic film, coating the surface of the plastic film with a layer of photosensitive coating or resin, curing it with ultraviolet light curing equipment, initiating the photoinitiator in the coating through ultraviolet light irradiation, generating free radicals and initiating polymerization reaction, forming a solid polymer, and improving the crosslinking density and surface hardness of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of a process for preparing an environmentally friendly, degradable, transparent plastic film. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] An environmentally friendly degradable transparent plastic film, the formula of the degradable transparent plastic film comprises a filler, polylactic acid, polybutylene succinate, an additive, glass fiber and a plasticizer; Fillers: 25%-35% fillers help reduce costs and improve biodegradability. The fillers in the formula can be corn starch, potato starch, sweet potato starch, cassava starch, and modified starch; The applicant's R&D and production personnel found in actual production that corn starch is the most common type of starch, with a wide source and low cost. Potato starch has good gelling properties and can improve the processing performance of the material. Sweet potato starch contains high amylose, which helps to improve the strength of the material. Cassava starch has a high content of branched starch, which can improve the flexibility of the material. Modified starch is treated by physical or chemical methods to improve its dispersibility and compatibility in plastics. When selecting starch, its impact on the performance of the final product, such as transparency, mechanical strength, processing performance, etc., can be considered. In addition, the use of modified starch can improve the thermal stability of starch and its compatibility with other polymers such as polylactic acid (PLA), thereby optimizing the overall performance of the material. Calcium carbonate is also added as a filler in the formula to improve the rigidity and heat resistance of the plastic film through calcium carbonate. Polylactic acid, 20%-35% polylactic acid, is used as the main biodegradable component, providing good biocompatibility and transparency. The polylactic acid in the formula is added with enzymatic PLA as needed to achieve rapid biodegradation while maintaining mechanical properties. The engineered enzymes embedded in PLA can increase the biodegradation rate of the film under home composting and soil conditions, and the enzyme content of the enzymatic PLA film can be controlled at around 0.02% w / w. The biodegradability and renewable resource characteristics of polylactic acid make it an environmentally friendly material, which helps reduce dependence on petroleum-based plastics and reduce the impact of plastic waste on the environment; Polybutylene succinate, 15%-25% polybutylene succinate, is used to provide good processing performance and mechanical properties. As a high molecular compound, polybutylene succinate (PBS) has excellent biodegradability and can be decomposed into carbon dioxide and water by microorganisms in the natural environment. Therefore, it is one of the important materials to solve the pollution problem of plastic film; Additives: 3%-7% additives, stabilizers and antioxidants are used to improve the stability and durability of plastic films; Glass fiber, 8%-12%, used to enhance the strength and rigidity of plastic film; Plasticizer, plasticizer 3%-7%, used to improve the flexibility of plastic film.

[0019] The environmentally friendly degradable transparent plastic film uses various types of starch as fillers to reduce manufacturing costs, uses polylactic acid as the main biodegradable component to provide good biocompatibility and transparency, uses calcium carbonate to improve the rigidity and heat resistance of the plastic film, adds enzymatic PLA to achieve rapid biodegradation while maintaining mechanical properties, and combines different materials to enable the transparent plastic film to achieve various properties such as good strength, flexibility, transparency, strength and rigidity, so that the plastic film can be applied to different needs of various industries and can be quickly degraded to achieve the purpose of pollution-free and environmental protection.

[0020] See also Figure 1 , a method for preparing an environmentally friendly degradable transparent plastic film, comprising the following steps: 1) Pre-treating the raw materials. Pre-treating each raw material according to the different formula includes drying and grinding the filler using starch into fine powder to improve its dispersibility in the mixture; drying polybutylene succinate and polylactic acid at an appropriate temperature to remove moisture and prevent degradation; cutting or crushing the glass fiber according to the required size; 2) Mixing the raw materials: first, mix the filler, polybutylene succinate and polylactic acid PLA through a mixer to ensure uniform distribution, and then gradually add the plasticizer to ensure that it is completely dispersed in the mixture, wherein starch, polybutylene succinate, polylactic acid PLA, glass fiber and plasticizer should be weighed according to the above formula ratio and then put into a high-speed mixer to mix evenly; 3) Add additives, such as stabilizers and antioxidants, as needed to improve the performance and stability of the material; 4) Melt mixing: melt the mixture at high temperature to ensure that all components are fully mixed and the glass fibers are evenly dispersed; 5) Extrusion film blowing: the mixed raw materials are melted and extruded in a twin-screw extruder, and then blown into a plastic film through a film blowing die. The extrusion temperature of the extrusion film should be set according to the melting point of each raw material, while the film blowing process requires the control of the temperature, pressure and cooling rate; 6) Cooling and shaping: the blown plastic film is cooled and shaped through a cooling roller to ensure the physical properties of the film; 7) Surface modification treatment, which includes plasma treatment, chemical treatment and UV curing of the plastic film after cooling and finalization. The surface modification treatment includes that after the plastic film is cooled, the surface of the plastic film can be treated with plasma treatment equipment. The treatment time, power and gas type need to be adjusted according to the plastic film material and the expected surface properties. Plasma is generated by exciting gas such as argon, oxygen or air to bombard the surface of the plastic film. Chemical treatment is performed after plasma treatment. The plastic film is immersed in a specific chemical solution, or the surface of the plastic film is treated with chemical vapor. New functional groups are introduced or the surface morphology is changed by chemical treatment. The surface modification treatment also includes curing the plastic film with a layer of photosensitive coating or resin after coating the surface of the plastic film with UV curing equipment. The photoinitiator in the coating is triggered by UV irradiation to generate free radicals and initiate polymerization reaction to form a solid polymer. The curing time, UV intensity and coating formula ratio are adjusted according to the plastic film material and the expected surface hardness. 8) Film rolling: rolling up the plastic film after surface modification, preparing for subsequent cutting and packaging; 9) Quality inspection: testing the performance of plastic films including transparency, mechanical properties, and thickness uniformity to ensure that they meet standard requirements; 10) Packing and warehousing: Cut and pack the qualified plastic films, mark the production date and batch number, and then put them into storage.

[0021] Compared with the prior art, the preparation method of the environmentally friendly degradable transparent plastic film provided in the embodiment of the present invention performs surface modification treatments such as thin film plasma, chemical treatment and ultraviolet light curing on the film after cooling and shaping, so as to generate plasma through the exciting gas of argon, oxygen or air, and bombard the surface of the plastic film, thereby improving the surface properties of the plastic film and improving its printability and adhesion. By immersing the plastic film in a specific chemical solution or treating the surface of the plastic film with chemical vapor, new functional groups are introduced or the surface morphology is changed by chemical treatment, so as to further improve the surface energy and wettability of the plastic film. After a layer of photosensitive coating or resin is coated on the surface of the plastic film, it is cured using ultraviolet light curing equipment, and the photoinitiator in the coating is initiated by ultraviolet light irradiation to generate free radicals and initiate a polymerization reaction to form a solid polymer, thereby improving the crosslinking density and surface hardness of the film.

[0022] The electrical components mentioned in this article are all connected to an external main controller and 380V AC power, and the main controller can be a conventional known device for control such as a computer.

[0023] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0024] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0025] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "back", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly, degradable, transparent plastic film, characterized in that: The degradable transparent plastic film formula comprises filler, polylactic acid, polybutylene succinate, additive, glass fiber and plasticizer; The filler helps to reduce costs and improve biodegradability; The polylactic acid is used as the main biodegradable component to provide good biocompatibility and transparency; The polybutylene succinate is used to provide good processing performance and mechanical properties; The auxiliary agent improves the stability and durability of the plastic film through stabilizers and antioxidants; The glass fiber is used to enhance the strength and rigidity of the plastic film; The plasticizer is used to improve the flexibility of the plastic film.

2. The environmentally friendly, degradable, transparent plastic film according to claim 1, characterized in that: The mass ratios of the components in the formula are: 25%-35% of the filler, 20%-35% of the polylactic acid, 15%-25% of the polybutylene succinate, 3%-7% of the auxiliary agent, 8%-12% of the glass fiber, and 3%-7% of the plasticizer.

3. The environmentally friendly, degradable, transparent plastic film according to claim 1, characterized in that: The filler can be corn starch, potato starch, sweet potato starch, tapioca starch, and modified starch.

4. The environmentally friendly, degradable, transparent plastic film according to claim 3, characterized in that: Calcium carbonate is also added to the filler to improve the rigidity and heat resistance of the plastic film.

5. The environmentally friendly, degradable, transparent plastic film according to claim 1, characterized in that: The polylactic acid is added with enzymatic PLA as required, and rapid biodegradation is achieved by enzymatic PLA while maintaining mechanical properties.

6. A method for preparing an environmentally friendly degradable transparent plastic film, characterized in that: The following steps are involved: 1) Pre-treat the raw materials, and perform corresponding pre-treatment on each different formula raw material; 2) Mix the raw materials. First, mix the filler, polybutylene succinate and polylactic acid PLA through a mixer to ensure uniform distribution, and then gradually add the plasticizer to ensure that it is completely dispersed in the mixture; 3) Add additives, stabilizers and antioxidants as needed to improve the performance and stability of the material; 4) Melt mixing: melt the mixture at high temperature to ensure that all components are fully mixed and the glass fibers are evenly dispersed; 5) Extrusion film blowing: the mixed raw materials are melted and extruded in a twin-screw extruder, and then blown into a plastic film through a film blowing die; 6) Cooling and shaping: the blown plastic film is cooled and shaped through a cooling roller to ensure the physical properties of the film; 7) Surface modification treatment: plasma, chemical treatment and UV curing surface treatment of plastic film after cooling and shaping; 8) Film rolling: rolling up the plastic film after surface modification, preparing for subsequent cutting and packaging; 9) Quality inspection, including performance testing of plastic films in terms of transparency, mechanical properties and thickness uniformity to ensure that they meet standard requirements; 10) Packing and warehousing: the qualified plastic film is cut and packaged, marked with production date and batch number, and then put into storage.

7. The method for preparing an environmentally friendly degradable transparent plastic film according to claim 6, characterized in that: The pretreatment of raw materials specifically includes drying and grinding the filler of starch into fine powder to improve its dispersibility in the mixture; drying polybutylene succinate and polylactic acid at a suitable temperature to remove moisture and prevent degradation; and cutting or crushing the glass fiber according to the required size.

8. The method for preparing an environmentally friendly degradable transparent plastic film according to claim 6, characterized in that: The extrusion film blowing process includes setting the extrusion temperature according to the melting points of the raw materials, while the film blowing process requires controlling the temperature, pressure and cooling rate.

9. The method for preparing an environmentally friendly degradable transparent plastic film according to claim 6, characterized in that: The surface modification treatment includes using plasma treatment equipment to treat the surface of the plastic film after the plastic film has been cooled. The treatment time, power and gas type need to be adjusted according to the plastic film material and the expected surface properties. Plasma is generated by exciting gas such as argon, oxygen or air to bombard the surface of the plastic film. Chemical treatment is performed after the plasma treatment. The plastic film is immersed in a specific chemical solution, or the surface of the plastic film is treated with chemical vapor. New functional groups are introduced or the surface morphology is changed through chemical treatment.

10. The method for preparing an environmentally friendly degradable transparent plastic film according to claim 6, characterized in that: The surface modification treatment also includes coating a layer of photosensitive coating or resin on the surface of the plastic film, and then curing it using ultraviolet light curing equipment. The photoinitiator in the coating is triggered by ultraviolet light to generate free radicals and initiate a polymerization reaction to form a solid polymer. The curing time, ultraviolet light intensity and coating formula ratio are adjusted according to the plastic film material and the expected surface hardness.

Images