The meaning of pva membrane
Pva membrane is a kind of water-soluble polymer, is characterized by good compactness, high crystallinity, stick relay strong, thin film made of flexible smooth, oil resistance, solvent resistance, abrasion resistance, good gas permeability resistance, water resistance and through special processing, wide range of USES.
Pva membrane based on poly (vinyl alcohol) as the main body, adding modifier, processed, after special craft processing, can be in the soil microbial degradation in full functional materials of green environmental protection. It can in a short time, the degradation of carbon dioxide and water, and has the function to improve the soil.
Pva membrane non-toxic, tasteless and harmless to human body, and the natural environment has a good affinity, not cumulative, free from contamination.
The advantage of water soluble pva membrane, the disadvantage is that poor water resistance. The poor resistance to water, as a result of its molecules with hydrophilic hydroxyl ( - 哦) 。 Hydroxyl closed properly, can if can be connected to the water resistance, can improve the water resistance of pva membrane. PVA containing hydroxyl, can happen all the typical reaction of polyols polycondensate, appropriate adding quantity is not big, can and hydroxyl groups of PVA moderate me, three dimensional structure of PVA to form a strong and stable PVA under the condition of wet air tightness, improve the ability of water resistance. < br />