Ningbo Fangli Technology Co., Ltd. is a mechanical
equipment manufacturer with nearly 30 years’ experiences of plastic pipe
extrusion equipment, new environmental protection and new materials equipment.
Since its establishment Fangli has been developed based on user’s demands.
Through continuous improvement, independent R&D on the core technology and
digestion & absorption of advanced technology and other means, we have
developed PVC pipe extrusion line, PP-R pipe extrusion line, PE water supply /
gas pipe extrusion line, which was recommended by the Chinese Ministry of
Construction to replace imported products. We have gained the title of
“First-class Brand in Zhejiang Province”.
PVC plastic is a multi-component plastic.
Different additives can be added according to different uses. Due to different
components, PVC products show different physical and mechanical properties,
which can be applied in different occasions. PVC plastic pipe accounts for a
large proportion in plastic pipe.
Today, let's talk about the knowledge of
PVC raw material selection and formula in the production process of PVC pipes
for reference.
SG-5 resin with low degree of
polymerization shall be selected as the resin in hard pipe production. The higher
the degree of polymerization, the better its physical and mechanical properties
and heat resistance. However, the poor fluidity of the resin brings some
difficulties to processing, so the viscosity is generally selected as (1.7 ~
1.8) × SG-5 resin of 10-3pa • s is suitable.
Hard pipes generally use lead stabilizer
with good thermal stability. Tribasic lead is commonly used, but its lubricity
is poor. It is usually used together with lead and barium soaps with good
lubricity.
When processing hard pipes, the selection
and use of lubricants are very important. We should not only consider internal
lubrication to reduce the intermolecular force and reduce the viscosity of the
melt, which is conducive to molding, but also consider external lubrication to
prevent the adhesion between the melt and the hot metal and make the surface of
the products bright.
Metal soaps are generally used for internal
lubrication and low melting point wax is used for external lubrication.
Calcium carbonate and barium (barite
powder) are mainly used as fillers. Calcium carbonate can improve the surface
performance of the pipe, and barium can improve the formability and make the
pipe easy to set. Both of them can reduce the cost, but excessive dosage will
affect the performance of the pipe. It is better to add no or less fillers to
the pressure pipe and corrosion-resistant pipe.
If you need more information, Ningbo Fangli
Technology Co., Ltd. welcomes you to call for a detailed inquiry, we will provide
you with professional technical guidance or equipment procurement suggestions.