Plasticizers are designed to increase the polymer plastic polymer, improve processability and give the products flexibility aids. Plasticizer function is that can be inserted between the polymer macromolecules, through isolation, shielding, coupling and other ways to undermine their interaction, and thus to lower the melting temperature of the resin. Softening temperature and the glass transition temperature, reduce melt viscosity and improve flowability, to improve resin processability and product flexibility purposes.
As an ideal plasticizer, should meet in the base resin compatibility, high plasticizing efficiency, durability and strong (including resistance to volatilization, migration resistance, resistance to extraction, etc.), excellent stability, flame retardant, non-toxic, electrically insulating and low-cost requirements. But in fact no one plasticizer fully equipped when conditions on the application often weigh the pros and cons based on product performance requirements, with the use, in order to achieve cost and performance of unity.
Plasticizer variety, different classification methods. As according to compatibility, solubility, molecular weight, application features (heat, mildew, fire-retardant, antistatic, weather, toxicity, etc.). But undoubtedly the most common chemical structure classification taxonomy. Accordingly phthalate plasticizer into lipids. Aliphatic dicarboxylic acid esters, alkyl sulfonic acid lipids, chlorine-containing plasticizers and polyester-based plasticizers.
In addition to the above effect, the plasticizer in PVC plastics masterbatch coloring and often choose the appropriate plasticizer as a dispersant, in order to achieve the purpose of promoting the pigment dispersion, reduce dust, improve operations and enhance the coloring effect. But thus requiring a plasticizer selected must have a relatively stable viscosity, volatility as low as possible, and to be good colored resin compatibility and does not cause pigment precipitation liquid colorant system.
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