Manganese stearate is an organic compound that is a photosensitizer at low addition levels and a weak stabilizer at high addition levels. This means that by appropriately adjusting the amount of manganese stearate added, we can control the photodegradation rate. The emergence of this substance provides new possibilities for solving the problem of plastic pollution.
Manganese stearate, when combined with iron stearate and cerium stearate, demonstrates a powerful synergistic effect. This tripartite combination not only enhances the photodegradation efficiency of plastic products but also preserves their original properties. This finding paves the way for a novel approach: enhancing photodegradation efficiency through the strategic use of multiple substances.
Our research also explores the use of manganese stearate as a degradation accelerator in thermo-oxygen biodegradable plastic films. Under composting conditions, this composite film undergoes significant mechanical property loss during heat treatment. However, the degradation rate remains effectively controlled. This promising result suggests a new avenue for controlling the degradation rate of materials through compositional and structural changes.
Although manganese stearate has shown good results in controlling the rate of photodegradation, we need to study its stability and safety under other environmental conditions further. After all, the use of any new material requires rigorous testing and evaluation to ensure its harmlessness to the human body and the environment.
The discovery and application of manganese stearate provide new possibilities for solving the problem of plastic pollution. By appropriately adjusting the amount of manganese stearate added, we can control the photodegradation speed. At the same time, the combined use of manganese stearate and other substances can further improve the photodegradation efficiency. Although manganese stearate currently requires further research and testing, its prospects are undoubtedly bright.
It is expected that by 2050, the cumulative global plastic production will reach 34 billion tons, of which 60% is the most widely used polyethylene and polypropylene.
Putting polyethylene and soap together is a no-brainer. But in fact, they are closely related at the molecular level. Fatty acid is the main raw material of surfactants such as soap. Its molecular structure is similar to that of polyethylene, except that the carbon chain length of fatty acid is much shorter than the long polymer chain of polyethylene.
Incomplete combustion of wood generates smoke. During the wood burning process, cellulose is decomposed into short-chain molecules to form small gas molecules. Carbon dioxide is generated after complete combustion. Plastic, like wood, changes from solid to gaseous state when burned in the fireplace.
This means that if the combustion conditions of polyethylene can be accurately controlled, the combustion process is stopped before the formation of small gas molecules, and it stops exactly at the fatty acid-like stage, making it possible to obtain molecules with suitable carbon chain lengths.
After nearly three years of research, researchers have created a special "fireplace." The subtlety of this combustion reaction device lies in the setting of the temperature gradient: the bottom temperature of the reaction device reaches 360°C, which can break the long chains of polyethylene. When the smoke generated rises into the cold zone, these molecules will condense to avoid further combustion and Break down into smaller gas molecules.
After such a reaction, the final residue formed in the device is the polyethylene short-chain molecular material they are looking for - wax.
Next, they injected air and a manganese stearate catalyst into the device, causing the wax in the device to undergo oxidation and subsequent saponification reactions to generate fatty acids, which are the raw materials for high-value surfactants and detergents.
What's even more gratifying is that putting polypropylene into this "fireplace" can also get similar results to polyethylene. This means that there is no need to separate the two types of waste in daily life, and they can be directly mixed and sent to the reaction device.
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