Biodegradable particulate polyvinyl alcohol (PVA) is a water-soluble polymer with good compactness, high crystallinity, strong adhesion, flexible and smooth film, oil resistance, solvent resistance, wear resistance, good gas permeability, and water resistance after special treatment.
Polyvinyl alcohol is non-toxic, tasteless and harmless to human body. It has good affinity with the natural environment. It does not accumulate and is pollution-free.
Polyvinyl alcohol (PVA) film is a kind of green environmental protection functional data, which is mainly composed of polyvinyl alcohol and participates in modifiers and other additives. It can be degraded completely by microorganisms in soil after special processing. It can degrade into carbon dioxide and water in a short period of time, and has the function of improving land.
The biggest advantage of polyvinyl alcohol film is its water solubility, and the biggest defect is its poor water resistance. The reason for the poor water resistance is the hydrophilic hydroxyl (- OH) in the molecule. The water resistance of PVA films can be improved if hydroxyl groups can be properly blocked and waterproof groups can be attached. PVA contains hydroxyl, which can trigger all the typical reactions of polyols. When appropriate polycondensates are selected, the hydroxyl in PVA can be moderately intermingled with the hydroxyl in PVA at a small amount of addition, which makes PVA form a strong three-dimensional structure, stabilizes the air tightness of PVA under wet conditions, and improves its water resistance.
In practical application, the water solubility and moisture absorption of PVA film can be controlled by adjusting the raw material, formula and process, so as to meet the needs of different application purposes.
Above is the relevant content introduced by biodegradable granules manufacturers. This article is from http://www.swjkl.com.