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Degradable plastic film
The benefits and convenience that plastic films bring to people are well known, but these films with excellent performance have become a problem to be solved in environmental pollution.
There are three traditional methods for disposing of waste plastics: combustion method, landfill method and manual recycling. However, these methods have a series of unsolved problems, some of which are social problems, and some are economic problems. It takes too long for these waste plastics to degrade in nature. For this reason, people add special functional additives to plastic materials to accelerate the degradation of plastic films in nature. Degradable plastics came into being in this way, and have broad development prospects.
Plastic degradable films can be divided into two categories: one is a controllable light-degradable film, and the other is a biodegradable film.
Under certain environmental conditions, the plastics whose chemical structure changes significantly and at the same time cause certain performance degradation are called degradable plastics (ISO-472, 1988).
The photosensitive plastic film must be sensitized and degraded by the solar ultraviolet spectrum (above 300nm) outdoors. This type of degradable film can be divided into two categories: polymeric photosensitive degradable film and additive photosensitive degradable film.
Polymeric photosensitive degradation film refers to a copolymer of monomers containing carbonyl groups and other monomers, and its molecular chain contains chromophoric groups or weak bonds, which are easy to undergo photodegradation-oxidation reactions.
Additive photosensitive degradation film refers to a plastic film added with a low-molecular photosensitizer. Through the photodecomposition and photochemical reaction of the photosensitizer, macromolecular free radicals are triggered, which makes the polymer easy to undergo oxidation reaction of the free radical chain reaction mechanism.
Now, the use of photosensitive degradable plastics to solve the environmental pollution of waste plastics is still controversial is whether the degradation products can ultimately participate in the natural carbon cycle. Therefore, people have pioneered new ways, and biodegradable plastics have come out.
Degradable plastics that can be degraded by natural microorganisms such as bacteria, molds, and algae are called biodegradable plastics (ISO472, 1988). In this degradation process, there are roughly three ways: biophysical action, biochemical action and direct enzyme action. Biodegradable plastics are mainly divided into two categories: starch-filled type and artificial direct synthesis type.
Currently, starch-filled biodegradable plastics are more mature, and some products have been industrialized. Starch-filled biodegradable plastics are made by adding starch or modified starch and other additives to ordinary plastics. This type of degradable plastic can be divided into two types: physically modified starch-filled type and chemically modified starch-filled type. Generally, starch has to be treated to change the surface of starch from its original hydrophilicity to hydrophobicity. At present, the most commonly used modified starch to produce PE degradable film is starch-ethylene/acrylic acid copolymer.
Artificial direct synthesis of biodegradable plastics is a research focus in Western countries, with a large number of developers and a large investment of funds. Most of this type of degradable plastics are non-petroleum raw materials and renewable biological resources, which is very attractive to countries with oil shortages. One of the most typical examples is the use of lactic acid to make biodegradable plastics. The starch in potato waste or cheese whey is enzymatically hydrolyzed into glucose, and glucose and other hydrolysates are fermented by bacteria to produce lactic acid. Polymers and copolymers made with lactic acid have excellent mechanical properties and degradation properties.
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven categories of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a full set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
The benefits and convenience that plastic films bring to people are well known, but these films with excellent performance have become a problem to be solved in environmental pollution.
There are three traditional methods for disposing of waste plastics: combustion method, landfill method and manual recycling. However, these methods have a series of unsolved problems, some of which are social problems, and some are economic problems. It takes too long for these waste plastics to degrade in nature. For this reason, people add special functional additives to plastic materials to accelerate the degradation of plastic films in nature. Degradable plastics came into being in this way, and have broad development prospects.
Plastic degradable films can be divided into two categories: one is a controllable light-degradable film, and the other is a biodegradable film.
Under certain environmental conditions, the plastics whose chemical structure changes significantly and at the same time cause certain performance degradation are called degradable plastics (ISO-472, 1988).
The photosensitive plastic film must be sensitized and degraded by the solar ultraviolet spectrum (above 300nm) outdoors. This type of degradable film can be divided into two categories: polymeric photosensitive degradable film and additive photosensitive degradable film.
Polymeric photosensitive degradation film refers to a copolymer of monomers containing carbonyl groups and other monomers, and its molecular chain contains chromophoric groups or weak bonds, which are easy to undergo photodegradation-oxidation reactions.
Additive photosensitive degradation film refers to a plastic film added with a low-molecular photosensitizer. Through the photodecomposition and photochemical reaction of the photosensitizer, macromolecular free radicals are triggered, which makes the polymer easy to undergo oxidation reaction of the free radical chain reaction mechanism.
Now, the use of photosensitive degradable plastics to solve the environmental pollution of waste plastics is still controversial is whether the degradation products can ultimately participate in the natural carbon cycle. Therefore, people have pioneered new ways, and biodegradable plastics have come out.
Degradable plastics that can be degraded by natural microorganisms such as bacteria, molds, and algae are called biodegradable plastics (ISO472, 1988). In this degradation process, there are roughly three ways: biophysical action, biochemical action and direct enzyme action. Biodegradable plastics are mainly divided into two categories: starch-filled type and artificial direct synthesis type.
Currently, starch-filled biodegradable plastics are more mature, and some products have been industrialized. Starch-filled biodegradable plastics are made by adding starch or modified starch and other additives to ordinary plastics. This type of degradable plastic can be divided into two types: physically modified starch-filled type and chemically modified starch-filled type. Generally, starch has to be treated to change the surface of starch from its original hydrophilicity to hydrophobicity. At present, the most commonly used modified starch to produce PE degradable film is starch-ethylene/acrylic acid copolymer.
Artificial direct synthesis of biodegradable plastics is a research focus in Western countries, with a large number of developers and a large investment of funds. Most of this type of degradable plastics are non-petroleum raw materials and renewable biological resources, which is very attractive to countries with oil shortages. One of the most typical examples is the use of lactic acid to make biodegradable plastics. The starch in potato waste or cheese whey is enzymatically hydrolyzed into glucose, and glucose and other hydrolysates are fermented by bacteria to produce lactic acid. Polymers and copolymers made with lactic acid have excellent mechanical properties and degradation properties.
The production process of the degradable film is relatively difficult, especially the processing temperature is quite strict. In addition, the test time of the degradable film is very long, so the degree of industrialization of the degradable film is not high.
Company Profile
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven categories of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a full set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
Company Address: No. 11, Kaifeng Road, Moling Street, Jiangning District, Nanjing City, Jiangsu Province