Plasticizer

 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 used in different objects, but its effect is often not the impact modifier  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 low molecular polyethylene  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 types of internal plasticizer
Internal plasticizer is actually part of the 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  carbon black 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 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