easy degradation and renewable

Nature has always given us a lot of warm sunshine, fresh air, fertile soil, green mountains and green waters, insects, birds and beasts, and various resources to form a visual, tactile, auditory and tasteful museum. Learning feast. With the continuous breakthrough of key technologies, bio-based plastics with low toxicity, easy degradation and renewable characteristics have gradually become important participants in protecting the environment and conserving resources. Not only in the packaging industry, but also in the agricultural field. Stage.

White pollution, the traditional film defects

China has vast arable land and abundant resources, which provides a natural fertile soil for agricultural development. The demand for various agricultural products is enormous. In 1979, the country began experimenting and popularizing mulch technology, which brought about a “white revolution” in agriculture. After more than 30 years of development, agricultural mulch has been widely used in China and has gradually become the fourth largest agricultural production material after seeds, pesticides and fertilizers. However, in the context of returning to eco-agriculture and developing a green economy, a large number of pesticides and fertilizers are no longer promoted. Traditional mulch films that have played a major role in increasing agricultural production and income have become more and more obvious, and they have been unable to meet the requirements of modern agriculture for green environmental protection. And resource saving requirements.

According to the survey, the current residual film volume is generally 60-90 kg/hm2, up to 165 kg/hm2, and the plastic film remaining in the fields, soils and ditch rivers accounts for at least 10% of the total supply. The residual amount is over 10 million tons. Most of the traditional mulch films are made of polyethylene (PE) plastic, which is difficult to degrade under natural conditions. If it cannot be recovered in time, the residual mulch affects the physical properties of the soil and the growth of the crop, resulting in double loss of planting income and ecological environment.

The current national standard for agricultural film thickness is 0.008 mm, but the limit deviation is allowed to float up and down by 0.003 mm, resulting in an ultra-thin film with a thickness of 0.005 mm as a qualified product. It has been sold in the agricultural materials market for a long time, and some black-hearted merchants produce 0.004 mm inferior film. The thinner the mulch film, the lower the manufacturing cost and the easier it is to break. At present, the recovery of residual film is mostly manual, the cost is more than 100 yuan / mu, and the recovery is not complete, the efficiency is low. If it is intended to be recycled and reused, under the condition that the sewage treatment and gas emission meet the environmental protection standards in the production process, The recycling cost of waste film is as high as 4,000 yuan / t.

Biodegradable, still a green farmland

Black degraded mulch

At present, the "degradable" mulch film on the market (mainly including photodegradable mulch film, thermal oxygen degradable mulch film, starch-filled mulch film, etc.), the main component is also polyethylene, which is cracked into pieces after use and buried in the soil without degradation and pulverization. After the plastic particles are difficult to remove, causing serious secondary pollution. The Bio-degradable mulch film produced by the gorgeous bio-based biodegradable plastic is mainly made of renewable resources such as plant cellulose, plant protein and starch. It not only has the functions of ordinary mulch, but also can be directly after the growth period. Tillage, no need for manual recycling.

White degradable mulch

 The controllability of the degradation process has been supported by sufficient experimental data. In the early stage, it exerts excellent properties of heat preservation, moisturizing and weed removal, and then begins to degrade in the specified degradation induction period, and is completely decomposed into water and carbon dioxide by environmental microorganisms, and finally completely absorbed by nature. At the same time, through the comparison test, the biodegradable mulch film was used for planting root crops for 3 consecutive years, and the yield increased by up to 12%. Therefore, to solve the white pollution problem of the film residue, the fully biodegradable film is the best choice.

Policy guidelines, set off the "green revolution" of agricultural film

The soil is the "base of life, the mother of all things", and is an important resource for human survival. In recent years, the state has attached great importance to the prevention and control of soil pollution, and has successively issued a series of policies to promote the market expansion of biodegradable membranes. In 2016, the State Council promulgated the “Ten Articles”, clearly indicating the revision of soil environmental quality standards for agricultural land and construction land; formulating standards for degradable agricultural mulch films, and revising agricultural mulch and pesticide packaging standards. In 2017, the Ministry of Agriculture issued the “Agricultural Membrane Recovery Action Plan”, which will further improve the farmland residual film pollution monitoring network, establish the use of film, pollution residues and recycling accounts, strengthen supervision and dispatch, and improve the assessment mechanism.

Industry insiders estimate that the introduction of the series of policies will bring huge market demand and imagination to China's soil pollution remediation work, forming a trillion-scale market scale. As a kind of environmentally friendly agricultural production materials, the fully biodegradable mulch film will occupy an important part in it and open up a vast market space.

China's mulching film coverage and usage have always ranked first in the world. In the past 30 years, the demand for mulch film has increased at an annual rate of about 10%. In 2016, the annual output of mulch film in China reached 1.58 million tons. Since the price of fully biodegradable mulch film is higher than that of polyethylene mulch film, many people think that this is the biggest obstacle that restricts its scale promotion. In fact, with the addition of residual film and recycling costs, the fully biodegradable film is actually more cost-effective than polyethylene film.

Reduce the consumption of fossil energy, and fundamentally solve the problem of waste film recycling, and eliminate white pollution of farmland. In the long run, the fully biodegradable film is more suitable for the development of modern agriculture. With the implementation of the national soil control policy, the fully biodegradable mulch film will gradually replace the traditional mulch film and set off a grand “green revolution”.