Open up a new road from paper to wood in the hotte
2022-10-18- Detail
Japan has opened up a new way to turn paper into wood. Recently, Japanese scientists have invented a new method to turn paper into wood, which has opened up a new way for the recycling of wood resources
wood is composed of fiber, hemicellulose and high molecular lignin combined with it. The relationship between them is like that between steel and concrete. Only when the fiber is covered with "concrete" called lignin can it become wood with special properties. Scientists' research is first to add phenol compounds with good affinity with lignin to small plants. In addition, after adding dilute acid, cellulose quickly turns into carbohydrates. Because carbohydrates are hydrophilic and lignin is hydrophobic, they can be separated in solution to avoid the fluctuation of plastic temperature and the fluctuation of extrusion pressure. Because lignin is coated with phenol compounds, it will not be damaged by acid
the structure of natural lignin is complex. When it becomes lignin phenol, its molecules are linear, with equal structure. The melting point is 130 ℃, and it becomes a single solid after cooling. Scientists named the above transformation process "mutual separation system"
in the experiment, researchers first shaped the pulp made of waste paper, and then added lignin. After lignification, it became products with different shapes. Once it is discarded again, as long as the fiber and lignin are separated, it can be recycled for the next time
(excerpted from China paper trade)
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