Degradation mechanism and background of the most p

  • Detail

Degradation mechanism and background of biodegradable gravure printing ink

1 Background of the popularity of biodegradable plastics

plastics will be stored after being discarded in the natural environment, and combustion treatment will become the cause of global warming. Biodegradable plastics, which are gradually decomposed by microorganisms and enter the natural circulation system, have attracted much attention in recent years and have entered the stage of popularization. Among them, biodegradable plastics made from plant raw materials are very attractive as substitutes for limited chemical resources

2. Biodegradation mechanism

printing because the service life of a product depends on the quality of a product, the gravure ink used has a variety of uses, and its basic low noise composition includes Colorants (pigments), connecting materials (resins, solvents), and additives. In such a composition, researchers call the ink using biodegradable resin as biodegradable gravure ink. That is, the ink adopts non biodegradable materials except biodegradable resin. The mechanism of biodegradation is through the fermentation of microorganisms. Biodegradable polymer (matrix) can not be decomposed by any microorganism, but requires specific microorganisms to complete. Even if the printed matter made of non biodegradable gravure ink is put into the environmental conditions for degradation, it cannot find the weight reduction, and it cannot decompose naturally when placed in the fermentation device under natural conditions

although the pigments used as colorants are composed of particles smaller than one micron, they are completely non biodegradable materials. It has been determined that this raw material often hinders the biodegradation of the ink resin. The ink layer after printing is an ink film composed of dry resin with pigment as the core, which will hinder the action of microorganisms several microns in size. It can be inferred that this is due to the antibacterial effect of the pigment. A Japanese company used household fermentation equipment to carry out the degradation test of biodegradable gravure printing ink. Basic knowledge of the testing machine, test environment: soil moisture content 50%, temperature 40 ± 3 ℃, ink layer thickness 10 μ M (dry state), the base film is 50 μ M polyester film, the pigment uses titanium oxide pigment (the weight ratio of resin to pigment is 1:3)

source: fine chemicals in the 21st century

Copyright © 2011 JIN SHI