What is mainly formulation components for UPVC pipe?
UPVC pipe, also known as rigid PVC pipe, isan amorphous thermoplastic vinyl chloride resin by
adding certain additives(such as stabilizers, lubricants, fillers, modifiers, etc.) through extruder
processing get to plasic pipe
In order to obtain rapid and uniformplasticization, should use suspension method loosen pvc resin.
K value of theresin is 66-68.
Commonly used lead-based one pack stabilizers,calcium-zinc stabilizers, tin stabilizers
Lead stabilizer have good heatstability,price very cheap, calcium zinc stabilizer is environmentally
friendlyand non-toxic, tin stabilizer is the best heat stabilizer, environmentallyfriendly and less dosage
Calcium stearate, stearic acid, paraffinand polyethylene wax are commonly used as internal and
The filler can improve the performance andreduce the cost. Calcium carbonate can play a skeleton
role in plasticproducts, which has a great effect on the dimensional stability of plasticproducts, can
improve the hardness of products, and can also improve thesurface gloss and smoothness of products.
Usually use GCC,Sometime also mixwith PCC together
5 Modified System
Modification systems often includeprocessing aid and impact modifier.
The main function of processing aid is topromote the melting of resin and improve the rheological
properties of melt.Because of the entanglement of molecular chains, the elasticity, strength and
elongation of PVC were improved.
Because UPVC is a brittle material, theproduct is easy to be damaged under external force, so it is
necessary to addimpact modifier to improve the impact strength of the product.
Commonly used pigments:
Carbon black, titanium dioxide, ultramarineblue, optical brightener