High-end biodegradable agricultural film materials make life better
Agricultural production is inseparable from the escort of agricultural film. The development of high-end and multi-functional agricultural film is inseparable from the continuous innovation of materials. Shanghai Petrochemical Research Institute (hereinafter referred to as Shanghai Institute) exerts the comprehensive advantages of production, education and research, and strives to help farmers increase production and income through technological innovation and product upgrading, and develop high-end biodegradable agricultural film materials to accelerate the construction of modern agricultural ecological civilization in order to bid farewell to white pollution. Dedication.
Background introduction
According to statistics, in 2017, the national film consumption was about 1.6 million tons, covering 390 million mu of land, and mainly based on non-degradable polyethylene. After the use of the mulch film, the recovery cost is high and the recovery is difficult, so that many mulch films are not recovered after use, and the residual amount in the soil is increasing year by year. In some provinces, the mulch film per mu of arable land has exceeded 10 kg, and the soil quality is degraded, resulting in crop yield reduction, endangering the country. 1.8 billion mu of arable land red line and food security.
Image from the web
The mulch remaining in the soil becomes a white pollution that blows up in the wind, and the non-degradable mulch film after recovery is usually incinerated due to ineffective use, resulting in secondary pollution of the atmosphere. The emergence of biodegradable polymer materials has become a dawn in solving white pollution and has drawn worldwide attention.
The people are eating for the sky, and agriculture is the foundation of the national economy. For thousands of years, the Chinese nation has been able to prosper and continue to survive, and it is essential to overcome the many natural disasters that produce the food necessary for people's lives. Agriculture, rural areas, and peasants, that is, the issue of “agriculture, rural areas and farmers” are major events that affect economic development, social stability, and the full realization of a well-off society. The new era of agricultural construction requires a new model of development supported by high technology, improving agricultural productivity and quality of agricultural products, and contributing to the realization of the "two hundred years" goal. Today, as people's need for a better life is growing, modern facility agriculture can ensure the production of fruits and vegetables and the stable production of grain through the use of agricultural film technology.
The new functional requirements of agricultural film put forward new technical challenges for the transformation and upgrading of synthetic resin industry. I have seen new opportunities for innovation and determined to use the technical accumulation of polymer materials research and development for decades to take responsibility for solving this technical problem for the country. The mission is to take advantage of the national key R&D plan as an opportunity to intervene in the development of new high-end agricultural film materials. Although the agricultural film materials have never been involved before, after analysis, our R&D team determined to adopt the chemical and structure-driven new material strategy, and through the original innovative synthesis to create functional new materials not available on the international market, to focus on solving the major commonalities in the agricultural film field. technical problem.
As the person in charge of the project, under the leadership of the party group of the group company and with the support of the first-class platform of Shanghai Institute, we quickly set up the Shanghai Institute as the lead unit, and jointly Tsinghua University, University of Science and Technology of China, Changchun Yinghua Institute of Chinese Academy of Sciences, Baishan Xifeng The project team of Plastic Industry, Shanghai Hongrui Bio and Zhejiang Haizheng Bio. It has been declared and successfully obtained the Ministry of Science and Technology.
Since 2017, the team has carried out research and development in a spirit of hard work and hard work, and has made exciting breakthroughs in the development of new materials and application of agricultural film. The project was rated as one of the landmark achievements of the National Key Research and Development Program's basic materials in 2017 and one of the top results of 2017-2018, which was valued by the leaders of the Ministry of Agriculture and Rural Affairs.
High-end biodegradable agricultural film materials make life better
The agricultural film is a kind of plastic film used to cover the farmland. It can maintain the soil moisture and increase the ground temperature to promote the rapid growth of the crop. It can be divided into the mulch film and the shed film according to the type. Agricultural film, like seeds, pesticides and fertilizers, has become an indispensable important means of production for modern agriculture to achieve stable production and high yield.
In 2017, the total output of China's agricultural film reached 2.9 million tons, ranking first in the world. However, China's agricultural film industry is large but not strong. The market for low-end and mid-range products is as high as 90%. The output of high-end agricultural film is low, and its performance is still international. Follow the running level. In order to improve the technical level of key basic materials, the Ministry of Science and Technology's first batch of national key research and development plans in 2016 set up a new material project for agricultural film. The research team of Shanghai Petrochemical Research Institute has taken a solid step in the research and development of high-end agricultural film materials.
High-performance biodegradable mulch film
The road to biodegradable mulch film development is not smooth. What is the development of biodegradable mulch films in the world? Is it a concept hype or a new material revolution?
In recent years, the development of biodegradable mulch film materials in the world has made great progress on the technical level, but it has been slow in industrialization and promotion and application. In order to solve the high cost of biodegradable mulch film, it is the key to produce low-cost biodegradable raw materials. Many microorganisms in nature can synthesize a biodegradable material, polyhydroxyalkanoate. Although this material degrades rapidly, its high cost is a major obstacle to its industrial application. Tsinghua University's R&D team has developed a low-cost technology for the production of polyhydroxyalkanoates by energy-saving and water-saving processes through advanced genetic engineering technology using halophilic microorganisms. However, it is very difficult to actually make such a biodegradable material into a mulch film.
Faced with the enormous challenges brought about by the weakness of the material itself, the research and development team of Shanghai Institute started from the material structure-performance theory, through the innovation of polymer modification technology, after hundreds of experiments, overcoming various technical problems, successfully developed an international advanced super Thin, high-strength, high-tough, biodegradable mulch film new materials, whose service life can be adjusted according to crop growth requirements. Due to the increased strength of the film, mechanical filming is achieved, which further improves the planting efficiency. By reducing the film thickness, the farmers' expenses can also be reduced, which helps to solve the problem that the price is high and cannot be used.
The new biodegradable mulch film currently developed by Shanghai Institute has been applied to crops such as rice, corn, peanuts, blueberries and vegetables. The use of biodegradable mulch film has increased rice yield by 20%. In the future, the use of biodegradable mulch film in the country can reduce the pollution of nearly 100 million mu of cultivated land, and it can save farmers more than 10 billion yuan in recycling costs. According to the bio-based content of 50% in the mulch film, the annual carbon emission reduction will exceed 200,000 tons, which will produce significant ecological and economic benefits.
In July this year, the Ministry of Agriculture and Rural Affairs listed the full biodegradable film replacement technology as ten major leading agricultural technologies.
Long life and high function shed film
Eating well has always been one of the goals of a better life we are constantly pursuing. Today, it is not difficult to eat fresh fruits and vegetables, which is mainly due to the film. The shed film can provide a mild climate environment with good temperature, humidity and light quality for crops, prevent pests and diseases and reduce the impact of natural disasters, and improve the yield and quality of crops. This is extremely important for the supply of crops in the wrong season for countries with large geographical and climatic differences.
After years of development, the film has been developed to the fourth generation - coated polyolefin functional film. A special nanomaterial coating process synchronizes the functionality of the coated polyolefin functional film with its lifetime. However, there is still a big gap between the performance of this high-end shed film and the international leading products. At present, there are still problems such as insufficient anti-fog and dust-proof function, insufficient light intensity ratio inside and outside the shed, and low photosynthesis efficiency. The usage time increases and decreases. Farmers use the same shed film for a period of not more than two years to re-exchange the film.
Through the development of new material synthesis technology and the study of key scientific issues, the Shanghai Institute focused on the development of special materials for functional greenhouse film, which made the membrane function permanent, and achieved breakthrough results. In less than a year, Shanghai Institute has developed a variety of new high-performance shed film special materials that are not available on the market. The long-life, long-lived, multi-functional composite shed membrane can help farmers to double their use period, save time and labor costs in the middle of the film, and effectively help farmers save money and improve crop yield and quality.
Biodegradable mulch film for rice mechanical filming
Through the application demonstration of crops such as beans, tomatoes, strawberries and watermelons, the new high-performance shed film special materials have good application effects, especially suitable for efficient wintering of greenhouse fruits, vegetables and other crops. The yield and quality of crops were significantly improved compared with the common greenhouse film, in which the bean yield increased by 20%, the strawberry yield increased by 8%, and the average price could be listed for 5 days in advance, resulting in significant economic benefits.
New material technology support, high-end transformation and upgrading
As a cooperative unit, Xifeng Plastic Industry currently has an annual output of more than 100,000 tons of agricultural film, and its production and sales rank first in the country for many years. However, similar to the overall situation of China's agricultural film industry, the company's high-end agricultural film products account for a relatively low proportion, and the overall added value is not high. The National Agricultural Membrane Project led by the Shanghai Petrochemical Research Institute brings a comprehensive technical upgrade from theory to practice, which strongly supports the company's product quality and efficiency.
In terms of biodegradable mulch film, the company used to use imported mulch special materials before, and its performance is difficult to fully meet the requirements of mulch film use, and the price is too high, so that farmers love and hate it. Through the Agricultural Membrane National Project, Shanghai Petrochemical Research Institute has developed a new biodegradable mulch film special material. The special material has good processability, and it can realize direct amplification manufacturing on many production lines without changing equipment, and obtain a new type of ultra-thin, high-strength and high-toughness. The biodegradable mulch film has higher performance than the high-end imported degradable mulch film in many aspects.
This new mulch film is currently used in crops such as rice, peanuts, corn, blueberries and vegetables. In the field of organic rice, the use of this film is particularly prominent, which not only saves a lot of manual weeding work, saves the cost of weeding 600 yuan/mu, and naturally degrades after the film is used up, does not affect the next season planting, but also increases the yield. A powerful and profitable tool for many quality organic northeast rice growers. Subsequent to the film will be expanded to an annual scale of 1,000 tons.
In the aspect of polyolefin shed film, the functionality is mostly achieved by adding additives inside, but these additives are not only difficult to be uniformly dispersed, but also easy to precipitate, resulting in a short functional life, and the farmers need to frequently change the shed film to increase the burden. After adopting the "permanent" functional polyolefin special material and dustproof special material developed by Shanghai Petrochemical Research Institute, the processability is good, and a long-term multifunctional composite greenhouse film can be successfully produced in a multi-layer co-extrusion production line. . According to the experimental results, the drip period and dust-proof period of the film have more than doubled compared with the original products, reaching the international advanced level.
At present, the shed film produced by special materials is highly praised by farmers, and has a long functional life, which significantly shortens the frequency of film change by farmers, saves labor and cost, and has good long-term light transmission, which makes the sheds have sufficient light and high temperature to achieve crop yield increase. And listed in advance to help farmers increase production and income.
Link ——
Using petroleum refinery by-product, naphtha as raw material, the basic raw materials such as ethylene and propylene obtained by cracking can be used to produce extremely rich polymer materials through polymerization technology, including plastics, fibers and rubber commonly used in daily life. Kinds of food packaging materials, beverage bottles and plastic products, fine clothing, plastic parts in household appliances, automotive interiors, etc. are all polymer materials.
In modern life, clothing, food, housing, and transportation are inseparable from polymers. These materials have greatly improved the quality of life of the people. The global annual polymer production is as high as 300 million tons, and more than 98% of synthetic polymer materials cannot be biodegraded. It takes a long time to degrade after decades or even hundreds of years. Discarding plastics in the environment causes white pollution, and an increasing number of micro-plastic particles have also been found in the vast oceans, which have begun to endanger the survival of marine life.
In agriculture, the mulch film is an important production material for farmers to increase production and increase income. The mulch film used now cannot be biodegraded. After years of use, the accumulation of non-degradable mulch film debris in the soil is increasing. In some areas of China, the land per acre has been It has reached more than 10 kilograms, seriously reducing soil quality and affecting crop growth, endangering the red line of China's 1.8 billion mu of cultivated land and national food security. These problems can be solved by using biodegradable polymer materials.
Petroleum and biomass are the two main raw materials for the manufacture of biodegradable materials. Using petroleum refining and petrochemical technology, it is possible to synthesize and prepare special monomer raw materials for biodegradable polymers, such as succinic acid, adipic acid, butylene glycol, etc., and then synthesize biodegradable polyester materials through polymerization technology. It can be completely biodegraded, and our commonly used beverage bottles PET materials and polyester shirts are not biodegradable.
Although these biodegradable polyesters are high-tech materials, their properties are incomplete and cannot be directly used to prepare the high-performance film materials we need. Special modifications are required to meet the requirements of high-quality films. The performance of biodegradable polyester materials should be greatly improved to obtain green and environmentally modified biodegradable plastics.
Biodegradable materials can be prepared using a large amount of natural biomass in nature. Biomass includes cellulose, starch, hemicellulose, etc. These biomasses are not plastics themselves. They cannot be manufactured by plastic processing methods. By developing a series of conversion technologies, cheap starch can be magically used. Become a biodegradable plastic.
Agriculture and forestry produce large amounts of waste, such as large amounts of cellulose in straw and branches, and are inexpensive, and are not themselves plastic raw materials. It is also possible to transform cellulose into thermoplastic cellulose by chemical techniques, and to produce biodegradable materials that are both biodegradable and natural.
The biodegradable polymer material can be made into a film. The modified polymer material enters an advanced film production equipment, and the inside of the machine is heated and melted, and then the huge pressure generated by the machine causes the material to pass through the air in the bubble, blowing the bubble like a balloon. The thinner the film is, the thinner the film is, and the resulting film will have the same area cost.
Biodegradable materials have limited properties and can only be blown into very thick films, so that consumers and customers spend a lot of money. The development of high-tech modification technology has changed this situation, using new technology to blow out very thin degradation films.
At present, the new biodegradable materials have been successfully blown on the large-scale production blown film equipment of cooperative enterprises, which can fully meet the needs of biodegradable film users.
The state has a mandatory thickness standard for non-biodegradable polyethylene film. The film is broken to prevent the film from breaking and remaining in the soil. The thickness of the film is not less than 10 microns. However, the biodegradable film does not need to be recycled without this thickness limitation.
The biodegradable mulch is specially modified to a thickness as low as 6 microns and can be as thin as 3 microns to 4 microns on laboratory equipment. The unmodified thick mulch film of the same area is about twice as heavy as the biodegradable mulch film, and the degraded mulch film has no recovery cost and environmental burden.
The specially modified mulch film retains good physical properties while reducing the thickness. The toughness of the mulch film is very good, it can be pulled long and not broken, and the film also has high strength, which can completely satisfy the film mechanical paving. Membrane requirements.
we offer patented full biodegradable film and PVA bag, all products are made by casting equipment, It is different from traditional blow molding products, all blow molding products are non full biodegradable. We can produce pva films and bags in full transparent and various colors. and the PVA film is more smooth than the traditional blow molding products.
we also offer organic material full biodegradable film and bags with patented raw material and production Process.
For more PVA film and bags products please visit us:
http://www.joyful-printing.net/pva-bag/
http://www.joyful-printing.com/pva-bag/ eng only