Why does PVC compound for pipe fitting need to add modifier?

PVC compound for pipe fitting is polymerized from polyvinyl chloride monomer (VCM). PVC material has the characteristics of non-toxic, anti-aging, acid and alkali resistance, and is very suitable for chemical pipelines. The mixture composed of a certain amount of solid additives (without plasticizers) added to the raw materials of polyvinyl chloride is called rigid polyvinyl chloride (UPVC).

• What are the characteristics of PVC compound for pipe fitting?

• What else do you need for processing raw materials for PVC compound for pipe fitting?

• Why does PVC compound for pipe fitting need to add modifier?

What are the characteristics of PVC compound for pipe fitting?

The maximum allowable use temperature of PVC compound for pipe fitting is 60℃, and the long-term use temperature is 45℃. It is suitable for conveying corrosive media with temperature lower than 45℃, and can also be used for conveying general pressure fluids, such as water supply and drainage pipes, agricultural irrigation pipes, Environmental engineering pipes, air conditioning pipes, etc. PVC compound for pipe fitting and CPVC pipe fittings have the characteristics of corrosion resistance, impact resistance, no deformation, smooth inner wall, no scaling, good heat preservation, non-conductivity, easy bonding, and long service life. Therefore, it gradually replaces other metal piping systems with the advantages of high cost performance and low construction cost. Moreover, PVC compound for pipe fitting and CPVC pipe fittings are easy to maintain and do not need to be shut down for a long time, causing huge losses. Therefore, PVC compound for pipe fitting and CPVC pipe fittings are the first choice for current industrial pipe design.

What else do you need for processing raw materials for PVC compound for pipe fitting?

If the PVC compound for pipe fitting resin does not add stabilizers, it will degrade and release HCl gas when the temperature in the air is higher than 150 °C. Stabilizers commonly used in pipe fittings include lead salts, calcium-zinc stabilizers, organotin and rare-earth stabilizers, etc. In comparison, monomer lead salts have better thermal stability, and calcium-zinc and rare-earth stabilizers are environmentally friendly. Organotin is environmentally friendly but expensive, and is rarely used in pipe fittings.

In the production process of PVC compound for pipe fitting, there are two types of lubricants: internal and external lubricants, but there is no particularly clear boundary between internal and external lubrication. Most lubricants have both internal and external lubrication properties, but they are compatible according to polarity. In principle, the inner and outer properties are biased. Excessive internal lubrication will make the product brittle and the impact resistance will decrease; excessive external lubrication will cause the product to peel and delaminate, and poor plasticization will affect the surface and mechanical properties.

Why does PVC compound for pipe fitting need to add modifier?

Adding modifiers to PVC compound for pipe fitting can improve processing performance, accelerate plasticization, and improve surface finish of products. The modifier generally referred to is ACR processing modifier. There are many kinds of ACR, and the quality of manufacturers varies. PVC-U pipe fittings have relatively high requirements for fluidity, and good fluidity can obtain relatively high surface quality and mechanical properties. , especially can significantly reduce the occurrence and quantity of butterfly spots, etc. At this time, ACR should choose products with fast plasticization, relatively small melt strength and viscosity.

With 16 years exporting experience, ZANBOND Group is a professional manufacturer and exporter concerned with the design, development and production of PVC raw materials & PVC Compound.

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