With the continuous improvement of living standards, people's packaging requirements for goods are getting higher and higher, which leads to the rapid development of the packaging industry. So what kinds of packaging materials are common in production and life? What are the differences between them?
1. Degradable plastic packaging materials
Degradable plastic packaging materials are considered to be the most promising green packaging materials. They are a new type of plastic that can be quickly degraded and disappeared in the natural environment after being discarded, without causing environmental pollution. China began to study in the early 1980s. Blended degradable plastic.
2. Photodegradable plastic packaging materials
Photodegradable plastic is a material that can be decomposed in an orderly manner under the irradiation of ultraviolet light. At home and abroad, extensive research has been carried out on photodegradable plastics based on cellulosic materials. The basic method is to introduce a photosensitive group into the main chain, or to add a photo-sensitizing chemical, a transition complex or the like to the polymer. Under ultraviolet light, cellulose breaks chain and produces non-polluting chemicals such as xylose, xylobiose, right-spiral glucose, cellobiose, acetaldehyde, acetic acid, carbon dioxide, water vapor, and the like.
3. Biodegradable plastic packaging materials
Biodegradable plastics are plastic materials that can be completely degraded into low molecular compounds under the action of various organisms in nature. Because it contains a certain amount of components that can degrade microorganisms and their enzymes, such as sugars, cellulose, organic acids, etc., it is an ideal plastic.
4. Starch-based biodegradable plastic packaging materials
Starch-based fully biodegradable plastics are materials that are currently undergoing rapid research and industrialization, and are expected to continue to reduce costs. In order to improve the blending compatibility of starch and high polymer, the starch must be modified, and the surface of the modified starch granules is covered with an alkyl group, which weakens the role of hydrogen bonding, and some synthetic resins such as polyethylene. The compatibility of high-polymers such as polyvinyl alcohol, polyvinyl chloride, polyester, and polystyrene can be improved to different extents, and the blend properties are stronger than the original starch filling system.
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