In the processing of PVC products, it is can’t be separated from the participation of plasticizers, as one of the indispensable processing of PVC products, its specific role is what?
The role and properties of plasticizers in PVC: The performance of plasticizers in PVC, including compatibility with PVC, plasticizing temperature, plasticizing efficiency, durability and so on.
compatibility with PVC: as a PVC
plasticizer, must have good compatibility with PVC. Poor compatibility of plasticizers, prone to
migration phenomenon from the surface of the product, not only lose the
plasticizing effect, but also affect the appearance of the product.
(2), plasticizing temperature soft PVC
plasticizing refers to the PVC by melting the process of forming a uniform
material, plasticizing temperature and PVC resin model, type and dosage of
plasticizers, as well as other additives in the formula has a
relationship. Generally, the plasticizer
with good compatibility and strong solvent ability has lower plasticizing temperature.
(3), plasticizing efficiency, different types
of plasticizers, in order to make the PVC material to achieve the same hardness
required dosage is different, the dosage of DOP as the benchmark, other types
of plasticizers to achieve the same hardness of the relative dosage, known as the
plasticizer plasticizing efficiency.
durability: the durability of plasticizer includes the resistance to
volatility, migration resistance, and the extraction resistance. In general, the volatilization of
plasticizers is mainly determined by the size of the molecular weight, and the
mobility is related to plasticizer and PVC and compatibility.
(5), Other properties, plasticizer
performance, but also includes cold resistance, electrical insulation, flame
retardant, mold resistance and so on.
PVC 4-steps plasticized theory:
(1), the plasticizer into the
pores of PVC resin particles,
(2), the surface of the resin particles is
expanded by plasticizer, and the internal strain occurs,
(3), all the particles
are expanded by the plasticizer, the plasticizer dispersed between the
The first three steps of
the plasticizing process are as complete as possible in the powder process. The fourth step, the mixture of PVC and
plasticizer and other additives is heated to a molten state, forming a uniform
soft PVC material, and finally finish the plasticizing process.
PVC plasticizers are widely used in coatings, PVC plastic granules, non-filled calendering film, artificial leather, cable material, sheet, soft and hard pipe, shoe soles, rubber and plastic strips, foaming material, film, flame retardant conveyor belt. Especially suitable for PVC steel doors and windows, PVC profile, PVC sheet, decorative materials, foaming rigid board and other products using plasticizers.