Environment-friendly biodegradable plastic bag and making process thereof

Abstract

The invention provides an environment-friendly biodegradable plastic bag which comprises the following raw materials in parts by weight: 100 parts of PBAT (Polybutylene Terephthalate), 20-30 parts ofcorn starch, 1-5 parts of a coupling agent, 0.1-0.5 part of a compatilizer and 10-20 parts of polylactic acid (PLA). The corn starch adopted in the biodegradable plastic bag disclosed by the inventioncomprises common corn starch and dithiocarbamic acid modified starch, wherein a mass ratio of the common corn starch to the dithiocarbamic acid modified starch is (3-5):1. The load-bearing strength of the plastic bag and a degradation effect in soil are improved.

Description

technical field [0001] The invention belongs to the technical field of packaging, and in particular relates to an environmentally friendly degradable plastic bag and a manufacturing process thereof. Background technique [0002] At present, China's annual output of plastics is 30 million tons, and its consumption is more than 60 million tons. The annual output of plastics in the world is 1 billion tons. If calculated according to the annual plastic waste of 15%, the annual plastic waste in the world is 150 million tons, and the annual plastic waste in China is more than 10 million tons. The proportion accounts for 40%. Such a large amount of waste plastics is buried in the ground as garbage, which will undoubtedly bring greater pressure to the lack of arable land. While plastics bring convenience to people's lives, they also bring troubles to the environment that are difficult to deal with. People call the disasters brought by plastics to the environment "white pollution". ...

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, the hazards of non-degradable popular plastics to the earth include: 1. The recycling value of plastic bags is low, and they are easy to be scattered in urban streets and tourist areas during use. The plastic structure is stable and not easy to be degraded by natural microorganisms. Long-term inseparability in natural environment

This means that if waste plastics are not recycled, they will become pollutants in the environment, exist permanently and accumulate continuously, which will cause great harm to the environment.

2. Affect agricultural development

3. Waste plastic products discarded on land or in water bodies are swallowed by animals as food, resulting in animal death

4. Landfilling of waste plastics will not only occupy a large amount of land, but also the occupied land will not be restored for a long time, affecting the sustainable use of land

[0008] At present, although there are many researches and reports on degradable plastics, many specific problems cannot be solved. Degradable plastic bags are dull and yellow in color and low in transparency, giving people a Not clean enough and ugly, don't worry about using it

In addition, the load-bearing capacity of degradable plastic bags is low, which cannot meet the requirements of customers for loading more things and repeated use; degradable plastics containing starch have poor water resistance and poor wet strength, and their mechanical properties will drop sharply when they encounter water.