New environmental protection \"paper\"-Iota

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News > Dynamic industry > New environmental protection \"paper\"

New environmental protection \"paper\"

Researchers at University of California at Riverside created the novel American without rewriting "ink printing paper" in the laboratory, in the form of glass or plastic film as the medium, the redox dye based on red, green, blue, three primary colors, recycled 20 times, without significant loss in contrast and resolution. The relevant research results are published in the December 2nd issue of "nature - Communication" online edition.
About the year 150, the paper first by Chinese invention, has multiple purposes, the most common is used for writing and printing. In fact, the development of civilization and the spread is largely due to the use of paper as a writing material. According to the survey, the 90% commercial information is retained in the paper, although a large number of printing paper is discarded in the only used once. But, like using traditional paper waste paper (and cartridge) will be accompanied by a series of environmental problems, such as deforestation, pollution of air, water and chemicals on the land, if the paper could be "erased" several times, then the situation can be changed.
It was reported recently physicist organization network, the experiment leader, the university chemistry professor Yin Yadong said: "this kind of dye forming 'imaging layer paper', printing is accomplished by the use of ultraviolet light can realize the dye bleaching. Erasable 'paper' does not need additional printing ink, which is feasible in economy and environment. It represents a can meet the increasing global sustainable development and environmental protection requirements and attractive alternative to conventional paper selection."
This novel "paper" is basically in the form of glass or plastic film rewritable media, letters and patterns can be repeated printing, keep a few days, then heating the erase simple. The three primary colors: blue, red, green, were prepared by using a commercial preparation of redox dye methylene blue, neutral red and green acid, including titanium dioxide nano crystal in the dye in the (these as catalyst) and thickening agent hydrogen cellulose (HEC). Mixed dye, catalyst and HEC added high reversible and reproducible to this "paper".
In the "write phase paper", UV reduced dye to its colorless state. While the erase phase redox dye to restore its original color, i.e. imaging materials by reaction with oxygen in the ambient environment and restore its original color. Usually it is heated to 115 DEG C can accelerate the reaction, the erasing process less than 10 minutes to complete.
The researchers said: "with this' paper 'print text has the advantages of high resolution, clearly visible, can be kept for more than three days in the external environment condition, which in practical application has a long enough time, such as reading the newspaper. What is more, it is simple in production, low production cost, low toxicity and low energy consumption."
In order to reduce the total cost, researchers are laboratory to 100 times using cycle as the goal and strive to increase the "paper" in the frequency of use, and study how to extend the printed text or image clarity over three days, to expand its potential uses, and adopted multicolor printing may be.

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