plasticizer simple description

Plasticizers ( English : Plasticizer), also known as a plasticizer, a plasticizer , an increase in softness of the material or liquefied additive material . Add object contains plastic , concrete , drywall materials, cement and gypsum and so on. The same kind of plasticizing agent often  fluorescent brightener used in different objects , but its effect is often not the same. Plasticizer range up to hundreds of kinds , but the most commonly used means one group of compounds known as phthalates . According to statistics, in 2004 the world's plasticizing agent market, totaled about 550 million tons and 6,000,000 tons moving toward . Add a plasticizer based plastics used functions in different environments, manufactured with a variety of toughness and softness , gloss finished , which required more soft plastic products the more plasticizer added . General often use plastic wrap , one is without additives PE (polyethylene ) material , but its viscosity is poor ; Another widely used is PVC (polyvinyl chloride ) plastic wrap, a large number of plasticizers to make PVC material becomes soft and increases viscosity, very suitable for fresh food packaging.
Use concrete plasticizer ( superplasticizer ) , can increase the workability of the mixture is not easy to produce cellular facilitate construction , thereby reducing the water content ratio , increase the intensity . The wall material can be increased by adding a mixture of plasticizers liquefaction degree , so they do not add too much water , can reduce the time required for drying the wall .
Basic categories
Internal plasticizer
Internal plasticizer is actually part of the  PVC profile stabilizer polymer . Plasticizers are generally within the polymer during the polymerization of the second monomer introduced . Since the second monomer in the polymer molecular structure , reducing the polymer molecule chains are isotactic , which reduces the crystallinity of the polymer chain . Such as vinyl chloride - vinyl acetate copolymer softer than vinyl chloride homopolymer . The use of plasticizers within the temperature range is relatively narrow , and must be added during the polymerization , so use less internal plasticizer .
External plasticizer
External plasticizer is a low molecular weight compounds or polymers , it is required to add the polymer plasticized , increase the plasticity of polymers . External plasticizer is generally a high boiling point of less volatile liquid or low melting point solids , and the  stearate magnesium vast majority of organic compounds are esters . Usually they do not react with the polymer , and the interaction of the polymer mainly in the swelling action of elevated temperatures , with the polymer to form a solid solution . External plasticizers production and a more comprehensive and easy to use, very wide application . Now people are referring to the general said plasticizer external plasticizer. Dioctyl phthalate (DOP) and dibutyl phthalate (DBP) are outside the plasticizer